Commit | Line | Data |
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0b86a832 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | #include <linux/sched.h> | |
19 | #include <linux/bio.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
8a4b83cc | 21 | #include <linux/buffer_head.h> |
f2d8d74d | 22 | #include <linux/blkdev.h> |
b765ead5 | 23 | #include <linux/iocontext.h> |
6f88a440 | 24 | #include <linux/capability.h> |
442a4f63 | 25 | #include <linux/ratelimit.h> |
59641015 | 26 | #include <linux/kthread.h> |
53b381b3 | 27 | #include <linux/raid/pq.h> |
803b2f54 | 28 | #include <linux/semaphore.h> |
8da4b8c4 | 29 | #include <linux/uuid.h> |
53b381b3 | 30 | #include <asm/div64.h> |
0b86a832 CM |
31 | #include "ctree.h" |
32 | #include "extent_map.h" | |
33 | #include "disk-io.h" | |
34 | #include "transaction.h" | |
35 | #include "print-tree.h" | |
36 | #include "volumes.h" | |
53b381b3 | 37 | #include "raid56.h" |
8b712842 | 38 | #include "async-thread.h" |
21adbd5c | 39 | #include "check-integrity.h" |
606686ee | 40 | #include "rcu-string.h" |
3fed40cc | 41 | #include "math.h" |
8dabb742 | 42 | #include "dev-replace.h" |
99994cde | 43 | #include "sysfs.h" |
0b86a832 | 44 | |
af902047 ZL |
45 | const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = { |
46 | [BTRFS_RAID_RAID10] = { | |
47 | .sub_stripes = 2, | |
48 | .dev_stripes = 1, | |
49 | .devs_max = 0, /* 0 == as many as possible */ | |
50 | .devs_min = 4, | |
8789f4fe | 51 | .tolerated_failures = 1, |
af902047 ZL |
52 | .devs_increment = 2, |
53 | .ncopies = 2, | |
54 | }, | |
55 | [BTRFS_RAID_RAID1] = { | |
56 | .sub_stripes = 1, | |
57 | .dev_stripes = 1, | |
58 | .devs_max = 2, | |
59 | .devs_min = 2, | |
8789f4fe | 60 | .tolerated_failures = 1, |
af902047 ZL |
61 | .devs_increment = 2, |
62 | .ncopies = 2, | |
63 | }, | |
64 | [BTRFS_RAID_DUP] = { | |
65 | .sub_stripes = 1, | |
66 | .dev_stripes = 2, | |
67 | .devs_max = 1, | |
68 | .devs_min = 1, | |
8789f4fe | 69 | .tolerated_failures = 0, |
af902047 ZL |
70 | .devs_increment = 1, |
71 | .ncopies = 2, | |
72 | }, | |
73 | [BTRFS_RAID_RAID0] = { | |
74 | .sub_stripes = 1, | |
75 | .dev_stripes = 1, | |
76 | .devs_max = 0, | |
77 | .devs_min = 2, | |
8789f4fe | 78 | .tolerated_failures = 0, |
af902047 ZL |
79 | .devs_increment = 1, |
80 | .ncopies = 1, | |
81 | }, | |
82 | [BTRFS_RAID_SINGLE] = { | |
83 | .sub_stripes = 1, | |
84 | .dev_stripes = 1, | |
85 | .devs_max = 1, | |
86 | .devs_min = 1, | |
8789f4fe | 87 | .tolerated_failures = 0, |
af902047 ZL |
88 | .devs_increment = 1, |
89 | .ncopies = 1, | |
90 | }, | |
91 | [BTRFS_RAID_RAID5] = { | |
92 | .sub_stripes = 1, | |
93 | .dev_stripes = 1, | |
94 | .devs_max = 0, | |
95 | .devs_min = 2, | |
8789f4fe | 96 | .tolerated_failures = 1, |
af902047 ZL |
97 | .devs_increment = 1, |
98 | .ncopies = 2, | |
99 | }, | |
100 | [BTRFS_RAID_RAID6] = { | |
101 | .sub_stripes = 1, | |
102 | .dev_stripes = 1, | |
103 | .devs_max = 0, | |
104 | .devs_min = 3, | |
8789f4fe | 105 | .tolerated_failures = 2, |
af902047 ZL |
106 | .devs_increment = 1, |
107 | .ncopies = 3, | |
108 | }, | |
109 | }; | |
110 | ||
fb75d857 | 111 | const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES] = { |
af902047 ZL |
112 | [BTRFS_RAID_RAID10] = BTRFS_BLOCK_GROUP_RAID10, |
113 | [BTRFS_RAID_RAID1] = BTRFS_BLOCK_GROUP_RAID1, | |
114 | [BTRFS_RAID_DUP] = BTRFS_BLOCK_GROUP_DUP, | |
115 | [BTRFS_RAID_RAID0] = BTRFS_BLOCK_GROUP_RAID0, | |
116 | [BTRFS_RAID_SINGLE] = 0, | |
117 | [BTRFS_RAID_RAID5] = BTRFS_BLOCK_GROUP_RAID5, | |
118 | [BTRFS_RAID_RAID6] = BTRFS_BLOCK_GROUP_RAID6, | |
119 | }; | |
120 | ||
621292ba DS |
121 | /* |
122 | * Table to convert BTRFS_RAID_* to the error code if minimum number of devices | |
123 | * condition is not met. Zero means there's no corresponding | |
124 | * BTRFS_ERROR_DEV_*_NOT_MET value. | |
125 | */ | |
126 | const int btrfs_raid_mindev_error[BTRFS_NR_RAID_TYPES] = { | |
127 | [BTRFS_RAID_RAID10] = BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET, | |
128 | [BTRFS_RAID_RAID1] = BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET, | |
129 | [BTRFS_RAID_DUP] = 0, | |
130 | [BTRFS_RAID_RAID0] = 0, | |
131 | [BTRFS_RAID_SINGLE] = 0, | |
132 | [BTRFS_RAID_RAID5] = BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET, | |
133 | [BTRFS_RAID_RAID6] = BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET, | |
134 | }; | |
135 | ||
2b82032c | 136 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
e4a4dce7 | 137 | struct btrfs_fs_info *fs_info); |
2ff7e61e | 138 | static int btrfs_relocate_sys_chunks(struct btrfs_fs_info *fs_info); |
733f4fbb | 139 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev); |
48a3b636 | 140 | static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev); |
733f4fbb | 141 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *device); |
5ab56090 LB |
142 | static int __btrfs_map_block(struct btrfs_fs_info *fs_info, |
143 | enum btrfs_map_op op, | |
144 | u64 logical, u64 *length, | |
145 | struct btrfs_bio **bbio_ret, | |
146 | int mirror_num, int need_raid_map); | |
2b82032c | 147 | |
67a2c45e | 148 | DEFINE_MUTEX(uuid_mutex); |
8a4b83cc | 149 | static LIST_HEAD(fs_uuids); |
c73eccf7 AJ |
150 | struct list_head *btrfs_get_fs_uuids(void) |
151 | { | |
152 | return &fs_uuids; | |
153 | } | |
8a4b83cc | 154 | |
2208a378 ID |
155 | static struct btrfs_fs_devices *__alloc_fs_devices(void) |
156 | { | |
157 | struct btrfs_fs_devices *fs_devs; | |
158 | ||
78f2c9e6 | 159 | fs_devs = kzalloc(sizeof(*fs_devs), GFP_KERNEL); |
2208a378 ID |
160 | if (!fs_devs) |
161 | return ERR_PTR(-ENOMEM); | |
162 | ||
163 | mutex_init(&fs_devs->device_list_mutex); | |
164 | ||
165 | INIT_LIST_HEAD(&fs_devs->devices); | |
935e5cc9 | 166 | INIT_LIST_HEAD(&fs_devs->resized_devices); |
2208a378 ID |
167 | INIT_LIST_HEAD(&fs_devs->alloc_list); |
168 | INIT_LIST_HEAD(&fs_devs->list); | |
169 | ||
170 | return fs_devs; | |
171 | } | |
172 | ||
173 | /** | |
174 | * alloc_fs_devices - allocate struct btrfs_fs_devices | |
175 | * @fsid: a pointer to UUID for this FS. If NULL a new UUID is | |
176 | * generated. | |
177 | * | |
178 | * Return: a pointer to a new &struct btrfs_fs_devices on success; | |
179 | * ERR_PTR() on error. Returned struct is not linked onto any lists and | |
180 | * can be destroyed with kfree() right away. | |
181 | */ | |
182 | static struct btrfs_fs_devices *alloc_fs_devices(const u8 *fsid) | |
183 | { | |
184 | struct btrfs_fs_devices *fs_devs; | |
185 | ||
186 | fs_devs = __alloc_fs_devices(); | |
187 | if (IS_ERR(fs_devs)) | |
188 | return fs_devs; | |
189 | ||
190 | if (fsid) | |
191 | memcpy(fs_devs->fsid, fsid, BTRFS_FSID_SIZE); | |
192 | else | |
193 | generate_random_uuid(fs_devs->fsid); | |
194 | ||
195 | return fs_devs; | |
196 | } | |
197 | ||
e4404d6e YZ |
198 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
199 | { | |
200 | struct btrfs_device *device; | |
201 | WARN_ON(fs_devices->opened); | |
202 | while (!list_empty(&fs_devices->devices)) { | |
203 | device = list_entry(fs_devices->devices.next, | |
204 | struct btrfs_device, dev_list); | |
205 | list_del(&device->dev_list); | |
606686ee | 206 | rcu_string_free(device->name); |
e4404d6e YZ |
207 | kfree(device); |
208 | } | |
209 | kfree(fs_devices); | |
210 | } | |
211 | ||
b8b8ff59 LC |
212 | static void btrfs_kobject_uevent(struct block_device *bdev, |
213 | enum kobject_action action) | |
214 | { | |
215 | int ret; | |
216 | ||
217 | ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); | |
218 | if (ret) | |
efe120a0 | 219 | pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", |
b8b8ff59 LC |
220 | action, |
221 | kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), | |
222 | &disk_to_dev(bdev->bd_disk)->kobj); | |
223 | } | |
224 | ||
143bede5 | 225 | void btrfs_cleanup_fs_uuids(void) |
8a4b83cc CM |
226 | { |
227 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 228 | |
2b82032c YZ |
229 | while (!list_empty(&fs_uuids)) { |
230 | fs_devices = list_entry(fs_uuids.next, | |
231 | struct btrfs_fs_devices, list); | |
232 | list_del(&fs_devices->list); | |
e4404d6e | 233 | free_fs_devices(fs_devices); |
8a4b83cc | 234 | } |
8a4b83cc CM |
235 | } |
236 | ||
12bd2fc0 ID |
237 | static struct btrfs_device *__alloc_device(void) |
238 | { | |
239 | struct btrfs_device *dev; | |
240 | ||
78f2c9e6 | 241 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
12bd2fc0 ID |
242 | if (!dev) |
243 | return ERR_PTR(-ENOMEM); | |
244 | ||
e0ae9994 DS |
245 | /* |
246 | * Preallocate a bio that's always going to be used for flushing device | |
247 | * barriers and matches the device lifespan | |
248 | */ | |
249 | dev->flush_bio = bio_alloc_bioset(GFP_KERNEL, 0, NULL); | |
250 | if (!dev->flush_bio) { | |
251 | kfree(dev); | |
252 | return ERR_PTR(-ENOMEM); | |
253 | } | |
254 | bio_get(dev->flush_bio); | |
255 | ||
12bd2fc0 ID |
256 | INIT_LIST_HEAD(&dev->dev_list); |
257 | INIT_LIST_HEAD(&dev->dev_alloc_list); | |
935e5cc9 | 258 | INIT_LIST_HEAD(&dev->resized_list); |
12bd2fc0 ID |
259 | |
260 | spin_lock_init(&dev->io_lock); | |
261 | ||
262 | spin_lock_init(&dev->reada_lock); | |
263 | atomic_set(&dev->reada_in_flight, 0); | |
addc3fa7 | 264 | atomic_set(&dev->dev_stats_ccnt, 0); |
546bed63 | 265 | btrfs_device_data_ordered_init(dev); |
9bcaaea7 | 266 | INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_DIRECT_RECLAIM); |
d0164adc | 267 | INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_DIRECT_RECLAIM); |
12bd2fc0 ID |
268 | |
269 | return dev; | |
270 | } | |
271 | ||
a1b32a59 CM |
272 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
273 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
274 | { |
275 | struct btrfs_device *dev; | |
8a4b83cc | 276 | |
c6e30871 | 277 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 278 | if (dev->devid == devid && |
8f18cf13 | 279 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 280 | return dev; |
a443755f | 281 | } |
8a4b83cc CM |
282 | } |
283 | return NULL; | |
284 | } | |
285 | ||
a1b32a59 | 286 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 287 | { |
8a4b83cc CM |
288 | struct btrfs_fs_devices *fs_devices; |
289 | ||
c6e30871 | 290 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
291 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
292 | return fs_devices; | |
293 | } | |
294 | return NULL; | |
295 | } | |
296 | ||
beaf8ab3 SB |
297 | static int |
298 | btrfs_get_bdev_and_sb(const char *device_path, fmode_t flags, void *holder, | |
299 | int flush, struct block_device **bdev, | |
300 | struct buffer_head **bh) | |
301 | { | |
302 | int ret; | |
303 | ||
304 | *bdev = blkdev_get_by_path(device_path, flags, holder); | |
305 | ||
306 | if (IS_ERR(*bdev)) { | |
307 | ret = PTR_ERR(*bdev); | |
beaf8ab3 SB |
308 | goto error; |
309 | } | |
310 | ||
311 | if (flush) | |
312 | filemap_write_and_wait((*bdev)->bd_inode->i_mapping); | |
313 | ret = set_blocksize(*bdev, 4096); | |
314 | if (ret) { | |
315 | blkdev_put(*bdev, flags); | |
316 | goto error; | |
317 | } | |
318 | invalidate_bdev(*bdev); | |
319 | *bh = btrfs_read_dev_super(*bdev); | |
92fc03fb AJ |
320 | if (IS_ERR(*bh)) { |
321 | ret = PTR_ERR(*bh); | |
beaf8ab3 SB |
322 | blkdev_put(*bdev, flags); |
323 | goto error; | |
324 | } | |
325 | ||
326 | return 0; | |
327 | ||
328 | error: | |
329 | *bdev = NULL; | |
330 | *bh = NULL; | |
331 | return ret; | |
332 | } | |
333 | ||
ffbd517d CM |
334 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
335 | struct bio *head, struct bio *tail) | |
336 | { | |
337 | ||
338 | struct bio *old_head; | |
339 | ||
340 | old_head = pending_bios->head; | |
341 | pending_bios->head = head; | |
342 | if (pending_bios->tail) | |
343 | tail->bi_next = old_head; | |
344 | else | |
345 | pending_bios->tail = tail; | |
346 | } | |
347 | ||
8b712842 CM |
348 | /* |
349 | * we try to collect pending bios for a device so we don't get a large | |
350 | * number of procs sending bios down to the same device. This greatly | |
351 | * improves the schedulers ability to collect and merge the bios. | |
352 | * | |
353 | * But, it also turns into a long list of bios to process and that is sure | |
354 | * to eventually make the worker thread block. The solution here is to | |
355 | * make some progress and then put this work struct back at the end of | |
356 | * the list if the block device is congested. This way, multiple devices | |
357 | * can make progress from a single worker thread. | |
358 | */ | |
143bede5 | 359 | static noinline void run_scheduled_bios(struct btrfs_device *device) |
8b712842 | 360 | { |
0b246afa | 361 | struct btrfs_fs_info *fs_info = device->fs_info; |
8b712842 CM |
362 | struct bio *pending; |
363 | struct backing_dev_info *bdi; | |
ffbd517d | 364 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
365 | struct bio *tail; |
366 | struct bio *cur; | |
367 | int again = 0; | |
ffbd517d | 368 | unsigned long num_run; |
d644d8a1 | 369 | unsigned long batch_run = 0; |
b64a2851 | 370 | unsigned long limit; |
b765ead5 | 371 | unsigned long last_waited = 0; |
d84275c9 | 372 | int force_reg = 0; |
0e588859 | 373 | int sync_pending = 0; |
211588ad CM |
374 | struct blk_plug plug; |
375 | ||
376 | /* | |
377 | * this function runs all the bios we've collected for | |
378 | * a particular device. We don't want to wander off to | |
379 | * another device without first sending all of these down. | |
380 | * So, setup a plug here and finish it off before we return | |
381 | */ | |
382 | blk_start_plug(&plug); | |
8b712842 | 383 | |
efa7c9f9 | 384 | bdi = device->bdev->bd_bdi; |
b64a2851 CM |
385 | limit = btrfs_async_submit_limit(fs_info); |
386 | limit = limit * 2 / 3; | |
387 | ||
8b712842 CM |
388 | loop: |
389 | spin_lock(&device->io_lock); | |
390 | ||
a6837051 | 391 | loop_lock: |
d84275c9 | 392 | num_run = 0; |
ffbd517d | 393 | |
8b712842 CM |
394 | /* take all the bios off the list at once and process them |
395 | * later on (without the lock held). But, remember the | |
396 | * tail and other pointers so the bios can be properly reinserted | |
397 | * into the list if we hit congestion | |
398 | */ | |
d84275c9 | 399 | if (!force_reg && device->pending_sync_bios.head) { |
ffbd517d | 400 | pending_bios = &device->pending_sync_bios; |
d84275c9 CM |
401 | force_reg = 1; |
402 | } else { | |
ffbd517d | 403 | pending_bios = &device->pending_bios; |
d84275c9 CM |
404 | force_reg = 0; |
405 | } | |
ffbd517d CM |
406 | |
407 | pending = pending_bios->head; | |
408 | tail = pending_bios->tail; | |
8b712842 | 409 | WARN_ON(pending && !tail); |
8b712842 CM |
410 | |
411 | /* | |
412 | * if pending was null this time around, no bios need processing | |
413 | * at all and we can stop. Otherwise it'll loop back up again | |
414 | * and do an additional check so no bios are missed. | |
415 | * | |
416 | * device->running_pending is used to synchronize with the | |
417 | * schedule_bio code. | |
418 | */ | |
ffbd517d CM |
419 | if (device->pending_sync_bios.head == NULL && |
420 | device->pending_bios.head == NULL) { | |
8b712842 CM |
421 | again = 0; |
422 | device->running_pending = 0; | |
ffbd517d CM |
423 | } else { |
424 | again = 1; | |
425 | device->running_pending = 1; | |
8b712842 | 426 | } |
ffbd517d CM |
427 | |
428 | pending_bios->head = NULL; | |
429 | pending_bios->tail = NULL; | |
430 | ||
8b712842 CM |
431 | spin_unlock(&device->io_lock); |
432 | ||
d397712b | 433 | while (pending) { |
ffbd517d CM |
434 | |
435 | rmb(); | |
d84275c9 CM |
436 | /* we want to work on both lists, but do more bios on the |
437 | * sync list than the regular list | |
438 | */ | |
439 | if ((num_run > 32 && | |
440 | pending_bios != &device->pending_sync_bios && | |
441 | device->pending_sync_bios.head) || | |
442 | (num_run > 64 && pending_bios == &device->pending_sync_bios && | |
443 | device->pending_bios.head)) { | |
ffbd517d CM |
444 | spin_lock(&device->io_lock); |
445 | requeue_list(pending_bios, pending, tail); | |
446 | goto loop_lock; | |
447 | } | |
448 | ||
8b712842 CM |
449 | cur = pending; |
450 | pending = pending->bi_next; | |
451 | cur->bi_next = NULL; | |
b64a2851 | 452 | |
ee863954 DS |
453 | /* |
454 | * atomic_dec_return implies a barrier for waitqueue_active | |
455 | */ | |
66657b31 | 456 | if (atomic_dec_return(&fs_info->nr_async_bios) < limit && |
b64a2851 CM |
457 | waitqueue_active(&fs_info->async_submit_wait)) |
458 | wake_up(&fs_info->async_submit_wait); | |
492bb6de | 459 | |
dac56212 | 460 | BUG_ON(atomic_read(&cur->__bi_cnt) == 0); |
d644d8a1 | 461 | |
2ab1ba68 CM |
462 | /* |
463 | * if we're doing the sync list, record that our | |
464 | * plug has some sync requests on it | |
465 | * | |
466 | * If we're doing the regular list and there are | |
467 | * sync requests sitting around, unplug before | |
468 | * we add more | |
469 | */ | |
470 | if (pending_bios == &device->pending_sync_bios) { | |
471 | sync_pending = 1; | |
472 | } else if (sync_pending) { | |
473 | blk_finish_plug(&plug); | |
474 | blk_start_plug(&plug); | |
475 | sync_pending = 0; | |
476 | } | |
477 | ||
4e49ea4a | 478 | btrfsic_submit_bio(cur); |
5ff7ba3a CM |
479 | num_run++; |
480 | batch_run++; | |
853d8ec4 DS |
481 | |
482 | cond_resched(); | |
8b712842 CM |
483 | |
484 | /* | |
485 | * we made progress, there is more work to do and the bdi | |
486 | * is now congested. Back off and let other work structs | |
487 | * run instead | |
488 | */ | |
57fd5a5f | 489 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
5f2cc086 | 490 | fs_info->fs_devices->open_devices > 1) { |
b765ead5 | 491 | struct io_context *ioc; |
8b712842 | 492 | |
b765ead5 CM |
493 | ioc = current->io_context; |
494 | ||
495 | /* | |
496 | * the main goal here is that we don't want to | |
497 | * block if we're going to be able to submit | |
498 | * more requests without blocking. | |
499 | * | |
500 | * This code does two great things, it pokes into | |
501 | * the elevator code from a filesystem _and_ | |
502 | * it makes assumptions about how batching works. | |
503 | */ | |
504 | if (ioc && ioc->nr_batch_requests > 0 && | |
505 | time_before(jiffies, ioc->last_waited + HZ/50UL) && | |
506 | (last_waited == 0 || | |
507 | ioc->last_waited == last_waited)) { | |
508 | /* | |
509 | * we want to go through our batch of | |
510 | * requests and stop. So, we copy out | |
511 | * the ioc->last_waited time and test | |
512 | * against it before looping | |
513 | */ | |
514 | last_waited = ioc->last_waited; | |
853d8ec4 | 515 | cond_resched(); |
b765ead5 CM |
516 | continue; |
517 | } | |
8b712842 | 518 | spin_lock(&device->io_lock); |
ffbd517d | 519 | requeue_list(pending_bios, pending, tail); |
a6837051 | 520 | device->running_pending = 1; |
8b712842 CM |
521 | |
522 | spin_unlock(&device->io_lock); | |
a8c93d4e QW |
523 | btrfs_queue_work(fs_info->submit_workers, |
524 | &device->work); | |
8b712842 CM |
525 | goto done; |
526 | } | |
d85c8a6f CM |
527 | /* unplug every 64 requests just for good measure */ |
528 | if (batch_run % 64 == 0) { | |
529 | blk_finish_plug(&plug); | |
530 | blk_start_plug(&plug); | |
531 | sync_pending = 0; | |
532 | } | |
8b712842 | 533 | } |
ffbd517d | 534 | |
51684082 CM |
535 | cond_resched(); |
536 | if (again) | |
537 | goto loop; | |
538 | ||
539 | spin_lock(&device->io_lock); | |
540 | if (device->pending_bios.head || device->pending_sync_bios.head) | |
541 | goto loop_lock; | |
542 | spin_unlock(&device->io_lock); | |
543 | ||
8b712842 | 544 | done: |
211588ad | 545 | blk_finish_plug(&plug); |
8b712842 CM |
546 | } |
547 | ||
b2950863 | 548 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
549 | { |
550 | struct btrfs_device *device; | |
551 | ||
552 | device = container_of(work, struct btrfs_device, work); | |
553 | run_scheduled_bios(device); | |
554 | } | |
555 | ||
4fde46f0 AJ |
556 | |
557 | void btrfs_free_stale_device(struct btrfs_device *cur_dev) | |
558 | { | |
559 | struct btrfs_fs_devices *fs_devs; | |
560 | struct btrfs_device *dev; | |
561 | ||
562 | if (!cur_dev->name) | |
563 | return; | |
564 | ||
565 | list_for_each_entry(fs_devs, &fs_uuids, list) { | |
566 | int del = 1; | |
567 | ||
568 | if (fs_devs->opened) | |
569 | continue; | |
570 | if (fs_devs->seeding) | |
571 | continue; | |
572 | ||
573 | list_for_each_entry(dev, &fs_devs->devices, dev_list) { | |
574 | ||
575 | if (dev == cur_dev) | |
576 | continue; | |
577 | if (!dev->name) | |
578 | continue; | |
579 | ||
580 | /* | |
581 | * Todo: This won't be enough. What if the same device | |
582 | * comes back (with new uuid and) with its mapper path? | |
583 | * But for now, this does help as mostly an admin will | |
584 | * either use mapper or non mapper path throughout. | |
585 | */ | |
586 | rcu_read_lock(); | |
587 | del = strcmp(rcu_str_deref(dev->name), | |
588 | rcu_str_deref(cur_dev->name)); | |
589 | rcu_read_unlock(); | |
590 | if (!del) | |
591 | break; | |
592 | } | |
593 | ||
594 | if (!del) { | |
595 | /* delete the stale device */ | |
596 | if (fs_devs->num_devices == 1) { | |
597 | btrfs_sysfs_remove_fsid(fs_devs); | |
598 | list_del(&fs_devs->list); | |
599 | free_fs_devices(fs_devs); | |
600 | } else { | |
601 | fs_devs->num_devices--; | |
602 | list_del(&dev->dev_list); | |
603 | rcu_string_free(dev->name); | |
604 | kfree(dev); | |
605 | } | |
606 | break; | |
607 | } | |
608 | } | |
609 | } | |
610 | ||
60999ca4 DS |
611 | /* |
612 | * Add new device to list of registered devices | |
613 | * | |
614 | * Returns: | |
615 | * 1 - first time device is seen | |
616 | * 0 - device already known | |
617 | * < 0 - error | |
618 | */ | |
a1b32a59 | 619 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
620 | struct btrfs_super_block *disk_super, |
621 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
622 | { | |
623 | struct btrfs_device *device; | |
624 | struct btrfs_fs_devices *fs_devices; | |
606686ee | 625 | struct rcu_string *name; |
60999ca4 | 626 | int ret = 0; |
8a4b83cc CM |
627 | u64 found_transid = btrfs_super_generation(disk_super); |
628 | ||
629 | fs_devices = find_fsid(disk_super->fsid); | |
630 | if (!fs_devices) { | |
2208a378 ID |
631 | fs_devices = alloc_fs_devices(disk_super->fsid); |
632 | if (IS_ERR(fs_devices)) | |
633 | return PTR_ERR(fs_devices); | |
634 | ||
8a4b83cc | 635 | list_add(&fs_devices->list, &fs_uuids); |
2208a378 | 636 | |
8a4b83cc CM |
637 | device = NULL; |
638 | } else { | |
a443755f CM |
639 | device = __find_device(&fs_devices->devices, devid, |
640 | disk_super->dev_item.uuid); | |
8a4b83cc | 641 | } |
443f24fe | 642 | |
8a4b83cc | 643 | if (!device) { |
2b82032c YZ |
644 | if (fs_devices->opened) |
645 | return -EBUSY; | |
646 | ||
12bd2fc0 ID |
647 | device = btrfs_alloc_device(NULL, &devid, |
648 | disk_super->dev_item.uuid); | |
649 | if (IS_ERR(device)) { | |
8a4b83cc | 650 | /* we can safely leave the fs_devices entry around */ |
12bd2fc0 | 651 | return PTR_ERR(device); |
8a4b83cc | 652 | } |
606686ee JB |
653 | |
654 | name = rcu_string_strdup(path, GFP_NOFS); | |
655 | if (!name) { | |
8a4b83cc CM |
656 | kfree(device); |
657 | return -ENOMEM; | |
658 | } | |
606686ee | 659 | rcu_assign_pointer(device->name, name); |
90519d66 | 660 | |
e5e9a520 | 661 | mutex_lock(&fs_devices->device_list_mutex); |
1f78160c | 662 | list_add_rcu(&device->dev_list, &fs_devices->devices); |
f7171750 | 663 | fs_devices->num_devices++; |
e5e9a520 CM |
664 | mutex_unlock(&fs_devices->device_list_mutex); |
665 | ||
60999ca4 | 666 | ret = 1; |
2b82032c | 667 | device->fs_devices = fs_devices; |
606686ee | 668 | } else if (!device->name || strcmp(device->name->str, path)) { |
b96de000 AJ |
669 | /* |
670 | * When FS is already mounted. | |
671 | * 1. If you are here and if the device->name is NULL that | |
672 | * means this device was missing at time of FS mount. | |
673 | * 2. If you are here and if the device->name is different | |
674 | * from 'path' that means either | |
675 | * a. The same device disappeared and reappeared with | |
676 | * different name. or | |
677 | * b. The missing-disk-which-was-replaced, has | |
678 | * reappeared now. | |
679 | * | |
680 | * We must allow 1 and 2a above. But 2b would be a spurious | |
681 | * and unintentional. | |
682 | * | |
683 | * Further in case of 1 and 2a above, the disk at 'path' | |
684 | * would have missed some transaction when it was away and | |
685 | * in case of 2a the stale bdev has to be updated as well. | |
686 | * 2b must not be allowed at all time. | |
687 | */ | |
688 | ||
689 | /* | |
0f23ae74 CM |
690 | * For now, we do allow update to btrfs_fs_device through the |
691 | * btrfs dev scan cli after FS has been mounted. We're still | |
692 | * tracking a problem where systems fail mount by subvolume id | |
693 | * when we reject replacement on a mounted FS. | |
b96de000 | 694 | */ |
0f23ae74 | 695 | if (!fs_devices->opened && found_transid < device->generation) { |
77bdae4d AJ |
696 | /* |
697 | * That is if the FS is _not_ mounted and if you | |
698 | * are here, that means there is more than one | |
699 | * disk with same uuid and devid.We keep the one | |
700 | * with larger generation number or the last-in if | |
701 | * generation are equal. | |
702 | */ | |
0f23ae74 | 703 | return -EEXIST; |
77bdae4d | 704 | } |
b96de000 | 705 | |
606686ee | 706 | name = rcu_string_strdup(path, GFP_NOFS); |
3a0524dc TH |
707 | if (!name) |
708 | return -ENOMEM; | |
606686ee JB |
709 | rcu_string_free(device->name); |
710 | rcu_assign_pointer(device->name, name); | |
cd02dca5 CM |
711 | if (device->missing) { |
712 | fs_devices->missing_devices--; | |
713 | device->missing = 0; | |
714 | } | |
8a4b83cc CM |
715 | } |
716 | ||
77bdae4d AJ |
717 | /* |
718 | * Unmount does not free the btrfs_device struct but would zero | |
719 | * generation along with most of the other members. So just update | |
720 | * it back. We need it to pick the disk with largest generation | |
721 | * (as above). | |
722 | */ | |
723 | if (!fs_devices->opened) | |
724 | device->generation = found_transid; | |
725 | ||
4fde46f0 AJ |
726 | /* |
727 | * if there is new btrfs on an already registered device, | |
728 | * then remove the stale device entry. | |
729 | */ | |
02feae3c AJ |
730 | if (ret > 0) |
731 | btrfs_free_stale_device(device); | |
4fde46f0 | 732 | |
8a4b83cc | 733 | *fs_devices_ret = fs_devices; |
60999ca4 DS |
734 | |
735 | return ret; | |
8a4b83cc CM |
736 | } |
737 | ||
e4404d6e YZ |
738 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
739 | { | |
740 | struct btrfs_fs_devices *fs_devices; | |
741 | struct btrfs_device *device; | |
742 | struct btrfs_device *orig_dev; | |
743 | ||
2208a378 ID |
744 | fs_devices = alloc_fs_devices(orig->fsid); |
745 | if (IS_ERR(fs_devices)) | |
746 | return fs_devices; | |
e4404d6e | 747 | |
adbbb863 | 748 | mutex_lock(&orig->device_list_mutex); |
02db0844 | 749 | fs_devices->total_devices = orig->total_devices; |
e4404d6e | 750 | |
46224705 | 751 | /* We have held the volume lock, it is safe to get the devices. */ |
e4404d6e | 752 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
606686ee JB |
753 | struct rcu_string *name; |
754 | ||
12bd2fc0 ID |
755 | device = btrfs_alloc_device(NULL, &orig_dev->devid, |
756 | orig_dev->uuid); | |
757 | if (IS_ERR(device)) | |
e4404d6e YZ |
758 | goto error; |
759 | ||
606686ee JB |
760 | /* |
761 | * This is ok to do without rcu read locked because we hold the | |
762 | * uuid mutex so nothing we touch in here is going to disappear. | |
763 | */ | |
e755f780 | 764 | if (orig_dev->name) { |
78f2c9e6 DS |
765 | name = rcu_string_strdup(orig_dev->name->str, |
766 | GFP_KERNEL); | |
e755f780 AJ |
767 | if (!name) { |
768 | kfree(device); | |
769 | goto error; | |
770 | } | |
771 | rcu_assign_pointer(device->name, name); | |
fd2696f3 | 772 | } |
e4404d6e | 773 | |
e4404d6e YZ |
774 | list_add(&device->dev_list, &fs_devices->devices); |
775 | device->fs_devices = fs_devices; | |
776 | fs_devices->num_devices++; | |
777 | } | |
adbbb863 | 778 | mutex_unlock(&orig->device_list_mutex); |
e4404d6e YZ |
779 | return fs_devices; |
780 | error: | |
adbbb863 | 781 | mutex_unlock(&orig->device_list_mutex); |
e4404d6e YZ |
782 | free_fs_devices(fs_devices); |
783 | return ERR_PTR(-ENOMEM); | |
784 | } | |
785 | ||
9eaed21e | 786 | void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices, int step) |
dfe25020 | 787 | { |
c6e30871 | 788 | struct btrfs_device *device, *next; |
443f24fe | 789 | struct btrfs_device *latest_dev = NULL; |
a6b0d5c8 | 790 | |
dfe25020 CM |
791 | mutex_lock(&uuid_mutex); |
792 | again: | |
46224705 | 793 | /* This is the initialized path, it is safe to release the devices. */ |
c6e30871 | 794 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
a6b0d5c8 | 795 | if (device->in_fs_metadata) { |
63a212ab | 796 | if (!device->is_tgtdev_for_dev_replace && |
443f24fe MX |
797 | (!latest_dev || |
798 | device->generation > latest_dev->generation)) { | |
799 | latest_dev = device; | |
a6b0d5c8 | 800 | } |
2b82032c | 801 | continue; |
a6b0d5c8 | 802 | } |
2b82032c | 803 | |
8dabb742 SB |
804 | if (device->devid == BTRFS_DEV_REPLACE_DEVID) { |
805 | /* | |
806 | * In the first step, keep the device which has | |
807 | * the correct fsid and the devid that is used | |
808 | * for the dev_replace procedure. | |
809 | * In the second step, the dev_replace state is | |
810 | * read from the device tree and it is known | |
811 | * whether the procedure is really active or | |
812 | * not, which means whether this device is | |
813 | * used or whether it should be removed. | |
814 | */ | |
815 | if (step == 0 || device->is_tgtdev_for_dev_replace) { | |
816 | continue; | |
817 | } | |
818 | } | |
2b82032c | 819 | if (device->bdev) { |
d4d77629 | 820 | blkdev_put(device->bdev, device->mode); |
2b82032c YZ |
821 | device->bdev = NULL; |
822 | fs_devices->open_devices--; | |
823 | } | |
824 | if (device->writeable) { | |
825 | list_del_init(&device->dev_alloc_list); | |
826 | device->writeable = 0; | |
8dabb742 SB |
827 | if (!device->is_tgtdev_for_dev_replace) |
828 | fs_devices->rw_devices--; | |
2b82032c | 829 | } |
e4404d6e YZ |
830 | list_del_init(&device->dev_list); |
831 | fs_devices->num_devices--; | |
606686ee | 832 | rcu_string_free(device->name); |
e4404d6e | 833 | kfree(device); |
dfe25020 | 834 | } |
2b82032c YZ |
835 | |
836 | if (fs_devices->seed) { | |
837 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
838 | goto again; |
839 | } | |
840 | ||
443f24fe | 841 | fs_devices->latest_bdev = latest_dev->bdev; |
a6b0d5c8 | 842 | |
dfe25020 | 843 | mutex_unlock(&uuid_mutex); |
dfe25020 | 844 | } |
a0af469b | 845 | |
1f78160c XG |
846 | static void __free_device(struct work_struct *work) |
847 | { | |
848 | struct btrfs_device *device; | |
849 | ||
850 | device = container_of(work, struct btrfs_device, rcu_work); | |
606686ee | 851 | rcu_string_free(device->name); |
e0ae9994 | 852 | bio_put(device->flush_bio); |
1f78160c XG |
853 | kfree(device); |
854 | } | |
855 | ||
856 | static void free_device(struct rcu_head *head) | |
857 | { | |
858 | struct btrfs_device *device; | |
859 | ||
860 | device = container_of(head, struct btrfs_device, rcu); | |
861 | ||
862 | INIT_WORK(&device->rcu_work, __free_device); | |
863 | schedule_work(&device->rcu_work); | |
864 | } | |
865 | ||
14238819 AJ |
866 | static void btrfs_close_bdev(struct btrfs_device *device) |
867 | { | |
868 | if (device->bdev && device->writeable) { | |
869 | sync_blockdev(device->bdev); | |
870 | invalidate_bdev(device->bdev); | |
871 | } | |
872 | ||
873 | if (device->bdev) | |
874 | blkdev_put(device->bdev, device->mode); | |
875 | } | |
876 | ||
0ccd0528 | 877 | static void btrfs_prepare_close_one_device(struct btrfs_device *device) |
f448341a AJ |
878 | { |
879 | struct btrfs_fs_devices *fs_devices = device->fs_devices; | |
880 | struct btrfs_device *new_device; | |
881 | struct rcu_string *name; | |
882 | ||
883 | if (device->bdev) | |
884 | fs_devices->open_devices--; | |
885 | ||
886 | if (device->writeable && | |
887 | device->devid != BTRFS_DEV_REPLACE_DEVID) { | |
888 | list_del_init(&device->dev_alloc_list); | |
889 | fs_devices->rw_devices--; | |
890 | } | |
891 | ||
892 | if (device->missing) | |
893 | fs_devices->missing_devices--; | |
894 | ||
895 | new_device = btrfs_alloc_device(NULL, &device->devid, | |
896 | device->uuid); | |
897 | BUG_ON(IS_ERR(new_device)); /* -ENOMEM */ | |
898 | ||
899 | /* Safe because we are under uuid_mutex */ | |
900 | if (device->name) { | |
901 | name = rcu_string_strdup(device->name->str, GFP_NOFS); | |
902 | BUG_ON(!name); /* -ENOMEM */ | |
903 | rcu_assign_pointer(new_device->name, name); | |
904 | } | |
905 | ||
906 | list_replace_rcu(&device->dev_list, &new_device->dev_list); | |
907 | new_device->fs_devices = device->fs_devices; | |
f448341a AJ |
908 | } |
909 | ||
2b82032c | 910 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 911 | { |
2037a093 | 912 | struct btrfs_device *device, *tmp; |
0ccd0528 AJ |
913 | struct list_head pending_put; |
914 | ||
915 | INIT_LIST_HEAD(&pending_put); | |
e4404d6e | 916 | |
2b82032c YZ |
917 | if (--fs_devices->opened > 0) |
918 | return 0; | |
8a4b83cc | 919 | |
c9513edb | 920 | mutex_lock(&fs_devices->device_list_mutex); |
2037a093 | 921 | list_for_each_entry_safe(device, tmp, &fs_devices->devices, dev_list) { |
0ccd0528 AJ |
922 | btrfs_prepare_close_one_device(device); |
923 | list_add(&device->dev_list, &pending_put); | |
8a4b83cc | 924 | } |
c9513edb XG |
925 | mutex_unlock(&fs_devices->device_list_mutex); |
926 | ||
0ccd0528 AJ |
927 | /* |
928 | * btrfs_show_devname() is using the device_list_mutex, | |
929 | * sometimes call to blkdev_put() leads vfs calling | |
930 | * into this func. So do put outside of device_list_mutex, | |
931 | * as of now. | |
932 | */ | |
933 | while (!list_empty(&pending_put)) { | |
934 | device = list_first_entry(&pending_put, | |
935 | struct btrfs_device, dev_list); | |
936 | list_del(&device->dev_list); | |
937 | btrfs_close_bdev(device); | |
938 | call_rcu(&device->rcu, free_device); | |
939 | } | |
940 | ||
e4404d6e YZ |
941 | WARN_ON(fs_devices->open_devices); |
942 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
943 | fs_devices->opened = 0; |
944 | fs_devices->seeding = 0; | |
2b82032c | 945 | |
8a4b83cc CM |
946 | return 0; |
947 | } | |
948 | ||
2b82032c YZ |
949 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
950 | { | |
e4404d6e | 951 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
952 | int ret; |
953 | ||
954 | mutex_lock(&uuid_mutex); | |
955 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
956 | if (!fs_devices->opened) { |
957 | seed_devices = fs_devices->seed; | |
958 | fs_devices->seed = NULL; | |
959 | } | |
2b82032c | 960 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
961 | |
962 | while (seed_devices) { | |
963 | fs_devices = seed_devices; | |
964 | seed_devices = fs_devices->seed; | |
965 | __btrfs_close_devices(fs_devices); | |
966 | free_fs_devices(fs_devices); | |
967 | } | |
bc178622 ES |
968 | /* |
969 | * Wait for rcu kworkers under __btrfs_close_devices | |
970 | * to finish all blkdev_puts so device is really | |
971 | * free when umount is done. | |
972 | */ | |
973 | rcu_barrier(); | |
2b82032c YZ |
974 | return ret; |
975 | } | |
976 | ||
e4404d6e YZ |
977 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
978 | fmode_t flags, void *holder) | |
8a4b83cc | 979 | { |
d5e2003c | 980 | struct request_queue *q; |
8a4b83cc CM |
981 | struct block_device *bdev; |
982 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 983 | struct btrfs_device *device; |
443f24fe | 984 | struct btrfs_device *latest_dev = NULL; |
a0af469b CM |
985 | struct buffer_head *bh; |
986 | struct btrfs_super_block *disk_super; | |
a0af469b | 987 | u64 devid; |
2b82032c | 988 | int seeding = 1; |
a0af469b | 989 | int ret = 0; |
8a4b83cc | 990 | |
d4d77629 TH |
991 | flags |= FMODE_EXCL; |
992 | ||
c6e30871 | 993 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
994 | if (device->bdev) |
995 | continue; | |
dfe25020 CM |
996 | if (!device->name) |
997 | continue; | |
998 | ||
f63e0cca ES |
999 | /* Just open everything we can; ignore failures here */ |
1000 | if (btrfs_get_bdev_and_sb(device->name->str, flags, holder, 1, | |
1001 | &bdev, &bh)) | |
beaf8ab3 | 1002 | continue; |
a0af469b CM |
1003 | |
1004 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 1005 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
a0af469b CM |
1006 | if (devid != device->devid) |
1007 | goto error_brelse; | |
1008 | ||
2b82032c YZ |
1009 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
1010 | BTRFS_UUID_SIZE)) | |
1011 | goto error_brelse; | |
1012 | ||
1013 | device->generation = btrfs_super_generation(disk_super); | |
443f24fe MX |
1014 | if (!latest_dev || |
1015 | device->generation > latest_dev->generation) | |
1016 | latest_dev = device; | |
a0af469b | 1017 | |
2b82032c YZ |
1018 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
1019 | device->writeable = 0; | |
1020 | } else { | |
1021 | device->writeable = !bdev_read_only(bdev); | |
1022 | seeding = 0; | |
1023 | } | |
1024 | ||
d5e2003c | 1025 | q = bdev_get_queue(bdev); |
90180da4 | 1026 | if (blk_queue_discard(q)) |
d5e2003c | 1027 | device->can_discard = 1; |
e884f4f0 AJ |
1028 | if (!blk_queue_nonrot(q)) |
1029 | fs_devices->rotating = 1; | |
d5e2003c | 1030 | |
8a4b83cc | 1031 | device->bdev = bdev; |
dfe25020 | 1032 | device->in_fs_metadata = 0; |
15916de8 CM |
1033 | device->mode = flags; |
1034 | ||
a0af469b | 1035 | fs_devices->open_devices++; |
55e50e45 ID |
1036 | if (device->writeable && |
1037 | device->devid != BTRFS_DEV_REPLACE_DEVID) { | |
2b82032c YZ |
1038 | fs_devices->rw_devices++; |
1039 | list_add(&device->dev_alloc_list, | |
1040 | &fs_devices->alloc_list); | |
1041 | } | |
4f6c9328 | 1042 | brelse(bh); |
a0af469b | 1043 | continue; |
a061fc8d | 1044 | |
a0af469b CM |
1045 | error_brelse: |
1046 | brelse(bh); | |
d4d77629 | 1047 | blkdev_put(bdev, flags); |
a0af469b | 1048 | continue; |
8a4b83cc | 1049 | } |
a0af469b | 1050 | if (fs_devices->open_devices == 0) { |
20bcd649 | 1051 | ret = -EINVAL; |
a0af469b CM |
1052 | goto out; |
1053 | } | |
2b82032c YZ |
1054 | fs_devices->seeding = seeding; |
1055 | fs_devices->opened = 1; | |
443f24fe | 1056 | fs_devices->latest_bdev = latest_dev->bdev; |
2b82032c | 1057 | fs_devices->total_rw_bytes = 0; |
a0af469b | 1058 | out: |
2b82032c YZ |
1059 | return ret; |
1060 | } | |
1061 | ||
1062 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 1063 | fmode_t flags, void *holder) |
2b82032c YZ |
1064 | { |
1065 | int ret; | |
1066 | ||
1067 | mutex_lock(&uuid_mutex); | |
1068 | if (fs_devices->opened) { | |
e4404d6e YZ |
1069 | fs_devices->opened++; |
1070 | ret = 0; | |
2b82032c | 1071 | } else { |
15916de8 | 1072 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 1073 | } |
8a4b83cc | 1074 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
1075 | return ret; |
1076 | } | |
1077 | ||
6cf86a00 AJ |
1078 | void btrfs_release_disk_super(struct page *page) |
1079 | { | |
1080 | kunmap(page); | |
1081 | put_page(page); | |
1082 | } | |
1083 | ||
1084 | int btrfs_read_disk_super(struct block_device *bdev, u64 bytenr, | |
1085 | struct page **page, struct btrfs_super_block **disk_super) | |
1086 | { | |
1087 | void *p; | |
1088 | pgoff_t index; | |
1089 | ||
1090 | /* make sure our super fits in the device */ | |
1091 | if (bytenr + PAGE_SIZE >= i_size_read(bdev->bd_inode)) | |
1092 | return 1; | |
1093 | ||
1094 | /* make sure our super fits in the page */ | |
1095 | if (sizeof(**disk_super) > PAGE_SIZE) | |
1096 | return 1; | |
1097 | ||
1098 | /* make sure our super doesn't straddle pages on disk */ | |
1099 | index = bytenr >> PAGE_SHIFT; | |
1100 | if ((bytenr + sizeof(**disk_super) - 1) >> PAGE_SHIFT != index) | |
1101 | return 1; | |
1102 | ||
1103 | /* pull in the page with our super */ | |
1104 | *page = read_cache_page_gfp(bdev->bd_inode->i_mapping, | |
1105 | index, GFP_KERNEL); | |
1106 | ||
1107 | if (IS_ERR_OR_NULL(*page)) | |
1108 | return 1; | |
1109 | ||
1110 | p = kmap(*page); | |
1111 | ||
1112 | /* align our pointer to the offset of the super block */ | |
1113 | *disk_super = p + (bytenr & ~PAGE_MASK); | |
1114 | ||
1115 | if (btrfs_super_bytenr(*disk_super) != bytenr || | |
1116 | btrfs_super_magic(*disk_super) != BTRFS_MAGIC) { | |
1117 | btrfs_release_disk_super(*page); | |
1118 | return 1; | |
1119 | } | |
1120 | ||
1121 | if ((*disk_super)->label[0] && | |
1122 | (*disk_super)->label[BTRFS_LABEL_SIZE - 1]) | |
1123 | (*disk_super)->label[BTRFS_LABEL_SIZE - 1] = '\0'; | |
1124 | ||
1125 | return 0; | |
1126 | } | |
1127 | ||
6f60cbd3 DS |
1128 | /* |
1129 | * Look for a btrfs signature on a device. This may be called out of the mount path | |
1130 | * and we are not allowed to call set_blocksize during the scan. The superblock | |
1131 | * is read via pagecache | |
1132 | */ | |
97288f2c | 1133 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
1134 | struct btrfs_fs_devices **fs_devices_ret) |
1135 | { | |
1136 | struct btrfs_super_block *disk_super; | |
1137 | struct block_device *bdev; | |
6f60cbd3 | 1138 | struct page *page; |
6f60cbd3 | 1139 | int ret = -EINVAL; |
8a4b83cc | 1140 | u64 devid; |
f2984462 | 1141 | u64 transid; |
02db0844 | 1142 | u64 total_devices; |
6f60cbd3 | 1143 | u64 bytenr; |
8a4b83cc | 1144 | |
6f60cbd3 DS |
1145 | /* |
1146 | * we would like to check all the supers, but that would make | |
1147 | * a btrfs mount succeed after a mkfs from a different FS. | |
1148 | * So, we need to add a special mount option to scan for | |
1149 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead | |
1150 | */ | |
1151 | bytenr = btrfs_sb_offset(0); | |
d4d77629 | 1152 | flags |= FMODE_EXCL; |
10f6327b | 1153 | mutex_lock(&uuid_mutex); |
6f60cbd3 DS |
1154 | |
1155 | bdev = blkdev_get_by_path(path, flags, holder); | |
6f60cbd3 DS |
1156 | if (IS_ERR(bdev)) { |
1157 | ret = PTR_ERR(bdev); | |
beaf8ab3 | 1158 | goto error; |
6f60cbd3 DS |
1159 | } |
1160 | ||
6cf86a00 | 1161 | if (btrfs_read_disk_super(bdev, bytenr, &page, &disk_super)) |
6f60cbd3 DS |
1162 | goto error_bdev_put; |
1163 | ||
a343832f | 1164 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
f2984462 | 1165 | transid = btrfs_super_generation(disk_super); |
02db0844 | 1166 | total_devices = btrfs_super_num_devices(disk_super); |
6f60cbd3 | 1167 | |
8a4b83cc | 1168 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
60999ca4 DS |
1169 | if (ret > 0) { |
1170 | if (disk_super->label[0]) { | |
62e85577 | 1171 | pr_info("BTRFS: device label %s ", disk_super->label); |
60999ca4 | 1172 | } else { |
62e85577 | 1173 | pr_info("BTRFS: device fsid %pU ", disk_super->fsid); |
60999ca4 DS |
1174 | } |
1175 | ||
62e85577 | 1176 | pr_cont("devid %llu transid %llu %s\n", devid, transid, path); |
60999ca4 DS |
1177 | ret = 0; |
1178 | } | |
02db0844 JB |
1179 | if (!ret && fs_devices_ret) |
1180 | (*fs_devices_ret)->total_devices = total_devices; | |
6f60cbd3 | 1181 | |
6cf86a00 | 1182 | btrfs_release_disk_super(page); |
6f60cbd3 DS |
1183 | |
1184 | error_bdev_put: | |
d4d77629 | 1185 | blkdev_put(bdev, flags); |
8a4b83cc | 1186 | error: |
beaf8ab3 | 1187 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
1188 | return ret; |
1189 | } | |
0b86a832 | 1190 | |
6d07bcec MX |
1191 | /* helper to account the used device space in the range */ |
1192 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, | |
1193 | u64 end, u64 *length) | |
1194 | { | |
1195 | struct btrfs_key key; | |
fb456252 | 1196 | struct btrfs_root *root = device->fs_info->dev_root; |
6d07bcec MX |
1197 | struct btrfs_dev_extent *dev_extent; |
1198 | struct btrfs_path *path; | |
1199 | u64 extent_end; | |
1200 | int ret; | |
1201 | int slot; | |
1202 | struct extent_buffer *l; | |
1203 | ||
1204 | *length = 0; | |
1205 | ||
63a212ab | 1206 | if (start >= device->total_bytes || device->is_tgtdev_for_dev_replace) |
6d07bcec MX |
1207 | return 0; |
1208 | ||
1209 | path = btrfs_alloc_path(); | |
1210 | if (!path) | |
1211 | return -ENOMEM; | |
e4058b54 | 1212 | path->reada = READA_FORWARD; |
6d07bcec MX |
1213 | |
1214 | key.objectid = device->devid; | |
1215 | key.offset = start; | |
1216 | key.type = BTRFS_DEV_EXTENT_KEY; | |
1217 | ||
1218 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1219 | if (ret < 0) | |
1220 | goto out; | |
1221 | if (ret > 0) { | |
1222 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
1223 | if (ret < 0) | |
1224 | goto out; | |
1225 | } | |
1226 | ||
1227 | while (1) { | |
1228 | l = path->nodes[0]; | |
1229 | slot = path->slots[0]; | |
1230 | if (slot >= btrfs_header_nritems(l)) { | |
1231 | ret = btrfs_next_leaf(root, path); | |
1232 | if (ret == 0) | |
1233 | continue; | |
1234 | if (ret < 0) | |
1235 | goto out; | |
1236 | ||
1237 | break; | |
1238 | } | |
1239 | btrfs_item_key_to_cpu(l, &key, slot); | |
1240 | ||
1241 | if (key.objectid < device->devid) | |
1242 | goto next; | |
1243 | ||
1244 | if (key.objectid > device->devid) | |
1245 | break; | |
1246 | ||
962a298f | 1247 | if (key.type != BTRFS_DEV_EXTENT_KEY) |
6d07bcec MX |
1248 | goto next; |
1249 | ||
1250 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
1251 | extent_end = key.offset + btrfs_dev_extent_length(l, | |
1252 | dev_extent); | |
1253 | if (key.offset <= start && extent_end > end) { | |
1254 | *length = end - start + 1; | |
1255 | break; | |
1256 | } else if (key.offset <= start && extent_end > start) | |
1257 | *length += extent_end - start; | |
1258 | else if (key.offset > start && extent_end <= end) | |
1259 | *length += extent_end - key.offset; | |
1260 | else if (key.offset > start && key.offset <= end) { | |
1261 | *length += end - key.offset + 1; | |
1262 | break; | |
1263 | } else if (key.offset > end) | |
1264 | break; | |
1265 | ||
1266 | next: | |
1267 | path->slots[0]++; | |
1268 | } | |
1269 | ret = 0; | |
1270 | out: | |
1271 | btrfs_free_path(path); | |
1272 | return ret; | |
1273 | } | |
1274 | ||
499f377f | 1275 | static int contains_pending_extent(struct btrfs_transaction *transaction, |
6df9a95e JB |
1276 | struct btrfs_device *device, |
1277 | u64 *start, u64 len) | |
1278 | { | |
fb456252 | 1279 | struct btrfs_fs_info *fs_info = device->fs_info; |
6df9a95e | 1280 | struct extent_map *em; |
499f377f | 1281 | struct list_head *search_list = &fs_info->pinned_chunks; |
6df9a95e | 1282 | int ret = 0; |
1b984508 | 1283 | u64 physical_start = *start; |
6df9a95e | 1284 | |
499f377f JM |
1285 | if (transaction) |
1286 | search_list = &transaction->pending_chunks; | |
04216820 FM |
1287 | again: |
1288 | list_for_each_entry(em, search_list, list) { | |
6df9a95e JB |
1289 | struct map_lookup *map; |
1290 | int i; | |
1291 | ||
95617d69 | 1292 | map = em->map_lookup; |
6df9a95e | 1293 | for (i = 0; i < map->num_stripes; i++) { |
c152b63e FM |
1294 | u64 end; |
1295 | ||
6df9a95e JB |
1296 | if (map->stripes[i].dev != device) |
1297 | continue; | |
1b984508 | 1298 | if (map->stripes[i].physical >= physical_start + len || |
6df9a95e | 1299 | map->stripes[i].physical + em->orig_block_len <= |
1b984508 | 1300 | physical_start) |
6df9a95e | 1301 | continue; |
c152b63e FM |
1302 | /* |
1303 | * Make sure that while processing the pinned list we do | |
1304 | * not override our *start with a lower value, because | |
1305 | * we can have pinned chunks that fall within this | |
1306 | * device hole and that have lower physical addresses | |
1307 | * than the pending chunks we processed before. If we | |
1308 | * do not take this special care we can end up getting | |
1309 | * 2 pending chunks that start at the same physical | |
1310 | * device offsets because the end offset of a pinned | |
1311 | * chunk can be equal to the start offset of some | |
1312 | * pending chunk. | |
1313 | */ | |
1314 | end = map->stripes[i].physical + em->orig_block_len; | |
1315 | if (end > *start) { | |
1316 | *start = end; | |
1317 | ret = 1; | |
1318 | } | |
6df9a95e JB |
1319 | } |
1320 | } | |
499f377f JM |
1321 | if (search_list != &fs_info->pinned_chunks) { |
1322 | search_list = &fs_info->pinned_chunks; | |
04216820 FM |
1323 | goto again; |
1324 | } | |
6df9a95e JB |
1325 | |
1326 | return ret; | |
1327 | } | |
1328 | ||
1329 | ||
0b86a832 | 1330 | /* |
499f377f JM |
1331 | * find_free_dev_extent_start - find free space in the specified device |
1332 | * @device: the device which we search the free space in | |
1333 | * @num_bytes: the size of the free space that we need | |
1334 | * @search_start: the position from which to begin the search | |
1335 | * @start: store the start of the free space. | |
1336 | * @len: the size of the free space. that we find, or the size | |
1337 | * of the max free space if we don't find suitable free space | |
7bfc837d | 1338 | * |
0b86a832 CM |
1339 | * this uses a pretty simple search, the expectation is that it is |
1340 | * called very infrequently and that a given device has a small number | |
1341 | * of extents | |
7bfc837d MX |
1342 | * |
1343 | * @start is used to store the start of the free space if we find. But if we | |
1344 | * don't find suitable free space, it will be used to store the start position | |
1345 | * of the max free space. | |
1346 | * | |
1347 | * @len is used to store the size of the free space that we find. | |
1348 | * But if we don't find suitable free space, it is used to store the size of | |
1349 | * the max free space. | |
0b86a832 | 1350 | */ |
499f377f JM |
1351 | int find_free_dev_extent_start(struct btrfs_transaction *transaction, |
1352 | struct btrfs_device *device, u64 num_bytes, | |
1353 | u64 search_start, u64 *start, u64 *len) | |
0b86a832 | 1354 | { |
0b246afa JM |
1355 | struct btrfs_fs_info *fs_info = device->fs_info; |
1356 | struct btrfs_root *root = fs_info->dev_root; | |
0b86a832 | 1357 | struct btrfs_key key; |
7bfc837d | 1358 | struct btrfs_dev_extent *dev_extent; |
2b82032c | 1359 | struct btrfs_path *path; |
7bfc837d MX |
1360 | u64 hole_size; |
1361 | u64 max_hole_start; | |
1362 | u64 max_hole_size; | |
1363 | u64 extent_end; | |
0b86a832 CM |
1364 | u64 search_end = device->total_bytes; |
1365 | int ret; | |
7bfc837d | 1366 | int slot; |
0b86a832 | 1367 | struct extent_buffer *l; |
8cdc7c5b FM |
1368 | |
1369 | /* | |
1370 | * We don't want to overwrite the superblock on the drive nor any area | |
1371 | * used by the boot loader (grub for example), so we make sure to start | |
1372 | * at an offset of at least 1MB. | |
1373 | */ | |
0d0c71b3 | 1374 | search_start = max_t(u64, search_start, SZ_1M); |
0b86a832 | 1375 | |
6df9a95e JB |
1376 | path = btrfs_alloc_path(); |
1377 | if (!path) | |
1378 | return -ENOMEM; | |
f2ab7618 | 1379 | |
7bfc837d MX |
1380 | max_hole_start = search_start; |
1381 | max_hole_size = 0; | |
1382 | ||
f2ab7618 | 1383 | again: |
63a212ab | 1384 | if (search_start >= search_end || device->is_tgtdev_for_dev_replace) { |
7bfc837d | 1385 | ret = -ENOSPC; |
6df9a95e | 1386 | goto out; |
7bfc837d MX |
1387 | } |
1388 | ||
e4058b54 | 1389 | path->reada = READA_FORWARD; |
6df9a95e JB |
1390 | path->search_commit_root = 1; |
1391 | path->skip_locking = 1; | |
7bfc837d | 1392 | |
0b86a832 CM |
1393 | key.objectid = device->devid; |
1394 | key.offset = search_start; | |
1395 | key.type = BTRFS_DEV_EXTENT_KEY; | |
7bfc837d | 1396 | |
125ccb0a | 1397 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
0b86a832 | 1398 | if (ret < 0) |
7bfc837d | 1399 | goto out; |
1fcbac58 YZ |
1400 | if (ret > 0) { |
1401 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
1402 | if (ret < 0) | |
7bfc837d | 1403 | goto out; |
1fcbac58 | 1404 | } |
7bfc837d | 1405 | |
0b86a832 CM |
1406 | while (1) { |
1407 | l = path->nodes[0]; | |
1408 | slot = path->slots[0]; | |
1409 | if (slot >= btrfs_header_nritems(l)) { | |
1410 | ret = btrfs_next_leaf(root, path); | |
1411 | if (ret == 0) | |
1412 | continue; | |
1413 | if (ret < 0) | |
7bfc837d MX |
1414 | goto out; |
1415 | ||
1416 | break; | |
0b86a832 CM |
1417 | } |
1418 | btrfs_item_key_to_cpu(l, &key, slot); | |
1419 | ||
1420 | if (key.objectid < device->devid) | |
1421 | goto next; | |
1422 | ||
1423 | if (key.objectid > device->devid) | |
7bfc837d | 1424 | break; |
0b86a832 | 1425 | |
962a298f | 1426 | if (key.type != BTRFS_DEV_EXTENT_KEY) |
7bfc837d | 1427 | goto next; |
9779b72f | 1428 | |
7bfc837d MX |
1429 | if (key.offset > search_start) { |
1430 | hole_size = key.offset - search_start; | |
9779b72f | 1431 | |
6df9a95e JB |
1432 | /* |
1433 | * Have to check before we set max_hole_start, otherwise | |
1434 | * we could end up sending back this offset anyway. | |
1435 | */ | |
499f377f | 1436 | if (contains_pending_extent(transaction, device, |
6df9a95e | 1437 | &search_start, |
1b984508 FL |
1438 | hole_size)) { |
1439 | if (key.offset >= search_start) { | |
1440 | hole_size = key.offset - search_start; | |
1441 | } else { | |
1442 | WARN_ON_ONCE(1); | |
1443 | hole_size = 0; | |
1444 | } | |
1445 | } | |
6df9a95e | 1446 | |
7bfc837d MX |
1447 | if (hole_size > max_hole_size) { |
1448 | max_hole_start = search_start; | |
1449 | max_hole_size = hole_size; | |
1450 | } | |
9779b72f | 1451 | |
7bfc837d MX |
1452 | /* |
1453 | * If this free space is greater than which we need, | |
1454 | * it must be the max free space that we have found | |
1455 | * until now, so max_hole_start must point to the start | |
1456 | * of this free space and the length of this free space | |
1457 | * is stored in max_hole_size. Thus, we return | |
1458 | * max_hole_start and max_hole_size and go back to the | |
1459 | * caller. | |
1460 | */ | |
1461 | if (hole_size >= num_bytes) { | |
1462 | ret = 0; | |
1463 | goto out; | |
0b86a832 CM |
1464 | } |
1465 | } | |
0b86a832 | 1466 | |
0b86a832 | 1467 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
7bfc837d MX |
1468 | extent_end = key.offset + btrfs_dev_extent_length(l, |
1469 | dev_extent); | |
1470 | if (extent_end > search_start) | |
1471 | search_start = extent_end; | |
0b86a832 CM |
1472 | next: |
1473 | path->slots[0]++; | |
1474 | cond_resched(); | |
1475 | } | |
0b86a832 | 1476 | |
38c01b96 | 1477 | /* |
1478 | * At this point, search_start should be the end of | |
1479 | * allocated dev extents, and when shrinking the device, | |
1480 | * search_end may be smaller than search_start. | |
1481 | */ | |
f2ab7618 | 1482 | if (search_end > search_start) { |
38c01b96 | 1483 | hole_size = search_end - search_start; |
1484 | ||
499f377f | 1485 | if (contains_pending_extent(transaction, device, &search_start, |
f2ab7618 ZL |
1486 | hole_size)) { |
1487 | btrfs_release_path(path); | |
1488 | goto again; | |
1489 | } | |
0b86a832 | 1490 | |
f2ab7618 ZL |
1491 | if (hole_size > max_hole_size) { |
1492 | max_hole_start = search_start; | |
1493 | max_hole_size = hole_size; | |
1494 | } | |
6df9a95e JB |
1495 | } |
1496 | ||
7bfc837d | 1497 | /* See above. */ |
f2ab7618 | 1498 | if (max_hole_size < num_bytes) |
7bfc837d MX |
1499 | ret = -ENOSPC; |
1500 | else | |
1501 | ret = 0; | |
1502 | ||
1503 | out: | |
2b82032c | 1504 | btrfs_free_path(path); |
7bfc837d | 1505 | *start = max_hole_start; |
b2117a39 | 1506 | if (len) |
7bfc837d | 1507 | *len = max_hole_size; |
0b86a832 CM |
1508 | return ret; |
1509 | } | |
1510 | ||
499f377f JM |
1511 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
1512 | struct btrfs_device *device, u64 num_bytes, | |
1513 | u64 *start, u64 *len) | |
1514 | { | |
499f377f | 1515 | /* FIXME use last free of some kind */ |
499f377f | 1516 | return find_free_dev_extent_start(trans->transaction, device, |
8cdc7c5b | 1517 | num_bytes, 0, start, len); |
499f377f JM |
1518 | } |
1519 | ||
b2950863 | 1520 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 | 1521 | struct btrfs_device *device, |
2196d6e8 | 1522 | u64 start, u64 *dev_extent_len) |
8f18cf13 | 1523 | { |
0b246afa JM |
1524 | struct btrfs_fs_info *fs_info = device->fs_info; |
1525 | struct btrfs_root *root = fs_info->dev_root; | |
8f18cf13 CM |
1526 | int ret; |
1527 | struct btrfs_path *path; | |
8f18cf13 | 1528 | struct btrfs_key key; |
a061fc8d CM |
1529 | struct btrfs_key found_key; |
1530 | struct extent_buffer *leaf = NULL; | |
1531 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
1532 | |
1533 | path = btrfs_alloc_path(); | |
1534 | if (!path) | |
1535 | return -ENOMEM; | |
1536 | ||
1537 | key.objectid = device->devid; | |
1538 | key.offset = start; | |
1539 | key.type = BTRFS_DEV_EXTENT_KEY; | |
924cd8fb | 1540 | again: |
8f18cf13 | 1541 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
a061fc8d CM |
1542 | if (ret > 0) { |
1543 | ret = btrfs_previous_item(root, path, key.objectid, | |
1544 | BTRFS_DEV_EXTENT_KEY); | |
b0b802d7 TI |
1545 | if (ret) |
1546 | goto out; | |
a061fc8d CM |
1547 | leaf = path->nodes[0]; |
1548 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1549 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1550 | struct btrfs_dev_extent); | |
1551 | BUG_ON(found_key.offset > start || found_key.offset + | |
1552 | btrfs_dev_extent_length(leaf, extent) < start); | |
924cd8fb MX |
1553 | key = found_key; |
1554 | btrfs_release_path(path); | |
1555 | goto again; | |
a061fc8d CM |
1556 | } else if (ret == 0) { |
1557 | leaf = path->nodes[0]; | |
1558 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1559 | struct btrfs_dev_extent); | |
79787eaa | 1560 | } else { |
0b246afa | 1561 | btrfs_handle_fs_error(fs_info, ret, "Slot search failed"); |
79787eaa | 1562 | goto out; |
a061fc8d | 1563 | } |
8f18cf13 | 1564 | |
2196d6e8 MX |
1565 | *dev_extent_len = btrfs_dev_extent_length(leaf, extent); |
1566 | ||
8f18cf13 | 1567 | ret = btrfs_del_item(trans, root, path); |
79787eaa | 1568 | if (ret) { |
0b246afa JM |
1569 | btrfs_handle_fs_error(fs_info, ret, |
1570 | "Failed to remove dev extent item"); | |
13212b54 | 1571 | } else { |
3204d33c | 1572 | set_bit(BTRFS_TRANS_HAVE_FREE_BGS, &trans->transaction->flags); |
79787eaa | 1573 | } |
b0b802d7 | 1574 | out: |
8f18cf13 CM |
1575 | btrfs_free_path(path); |
1576 | return ret; | |
1577 | } | |
1578 | ||
48a3b636 ES |
1579 | static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
1580 | struct btrfs_device *device, | |
1581 | u64 chunk_tree, u64 chunk_objectid, | |
1582 | u64 chunk_offset, u64 start, u64 num_bytes) | |
0b86a832 CM |
1583 | { |
1584 | int ret; | |
1585 | struct btrfs_path *path; | |
0b246afa JM |
1586 | struct btrfs_fs_info *fs_info = device->fs_info; |
1587 | struct btrfs_root *root = fs_info->dev_root; | |
0b86a832 CM |
1588 | struct btrfs_dev_extent *extent; |
1589 | struct extent_buffer *leaf; | |
1590 | struct btrfs_key key; | |
1591 | ||
dfe25020 | 1592 | WARN_ON(!device->in_fs_metadata); |
63a212ab | 1593 | WARN_ON(device->is_tgtdev_for_dev_replace); |
0b86a832 CM |
1594 | path = btrfs_alloc_path(); |
1595 | if (!path) | |
1596 | return -ENOMEM; | |
1597 | ||
0b86a832 | 1598 | key.objectid = device->devid; |
2b82032c | 1599 | key.offset = start; |
0b86a832 CM |
1600 | key.type = BTRFS_DEV_EXTENT_KEY; |
1601 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1602 | sizeof(*extent)); | |
2cdcecbc MF |
1603 | if (ret) |
1604 | goto out; | |
0b86a832 CM |
1605 | |
1606 | leaf = path->nodes[0]; | |
1607 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1608 | struct btrfs_dev_extent); | |
e17cade2 CM |
1609 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
1610 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
1611 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
1612 | ||
0b246afa | 1613 | write_extent_buffer_chunk_tree_uuid(leaf, fs_info->chunk_tree_uuid); |
e17cade2 | 1614 | |
0b86a832 CM |
1615 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
1616 | btrfs_mark_buffer_dirty(leaf); | |
2cdcecbc | 1617 | out: |
0b86a832 CM |
1618 | btrfs_free_path(path); |
1619 | return ret; | |
1620 | } | |
1621 | ||
6df9a95e | 1622 | static u64 find_next_chunk(struct btrfs_fs_info *fs_info) |
0b86a832 | 1623 | { |
6df9a95e JB |
1624 | struct extent_map_tree *em_tree; |
1625 | struct extent_map *em; | |
1626 | struct rb_node *n; | |
1627 | u64 ret = 0; | |
0b86a832 | 1628 | |
6df9a95e JB |
1629 | em_tree = &fs_info->mapping_tree.map_tree; |
1630 | read_lock(&em_tree->lock); | |
1631 | n = rb_last(&em_tree->map); | |
1632 | if (n) { | |
1633 | em = rb_entry(n, struct extent_map, rb_node); | |
1634 | ret = em->start + em->len; | |
0b86a832 | 1635 | } |
6df9a95e JB |
1636 | read_unlock(&em_tree->lock); |
1637 | ||
0b86a832 CM |
1638 | return ret; |
1639 | } | |
1640 | ||
53f10659 ID |
1641 | static noinline int find_next_devid(struct btrfs_fs_info *fs_info, |
1642 | u64 *devid_ret) | |
0b86a832 CM |
1643 | { |
1644 | int ret; | |
1645 | struct btrfs_key key; | |
1646 | struct btrfs_key found_key; | |
2b82032c YZ |
1647 | struct btrfs_path *path; |
1648 | ||
2b82032c YZ |
1649 | path = btrfs_alloc_path(); |
1650 | if (!path) | |
1651 | return -ENOMEM; | |
0b86a832 CM |
1652 | |
1653 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1654 | key.type = BTRFS_DEV_ITEM_KEY; | |
1655 | key.offset = (u64)-1; | |
1656 | ||
53f10659 | 1657 | ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, path, 0, 0); |
0b86a832 CM |
1658 | if (ret < 0) |
1659 | goto error; | |
1660 | ||
79787eaa | 1661 | BUG_ON(ret == 0); /* Corruption */ |
0b86a832 | 1662 | |
53f10659 ID |
1663 | ret = btrfs_previous_item(fs_info->chunk_root, path, |
1664 | BTRFS_DEV_ITEMS_OBJECTID, | |
0b86a832 CM |
1665 | BTRFS_DEV_ITEM_KEY); |
1666 | if (ret) { | |
53f10659 | 1667 | *devid_ret = 1; |
0b86a832 CM |
1668 | } else { |
1669 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1670 | path->slots[0]); | |
53f10659 | 1671 | *devid_ret = found_key.offset + 1; |
0b86a832 CM |
1672 | } |
1673 | ret = 0; | |
1674 | error: | |
2b82032c | 1675 | btrfs_free_path(path); |
0b86a832 CM |
1676 | return ret; |
1677 | } | |
1678 | ||
1679 | /* | |
1680 | * the device information is stored in the chunk root | |
1681 | * the btrfs_device struct should be fully filled in | |
1682 | */ | |
48a3b636 | 1683 | static int btrfs_add_device(struct btrfs_trans_handle *trans, |
5b4aacef | 1684 | struct btrfs_fs_info *fs_info, |
48a3b636 | 1685 | struct btrfs_device *device) |
0b86a832 | 1686 | { |
5b4aacef | 1687 | struct btrfs_root *root = fs_info->chunk_root; |
0b86a832 CM |
1688 | int ret; |
1689 | struct btrfs_path *path; | |
1690 | struct btrfs_dev_item *dev_item; | |
1691 | struct extent_buffer *leaf; | |
1692 | struct btrfs_key key; | |
1693 | unsigned long ptr; | |
0b86a832 | 1694 | |
0b86a832 CM |
1695 | path = btrfs_alloc_path(); |
1696 | if (!path) | |
1697 | return -ENOMEM; | |
1698 | ||
0b86a832 CM |
1699 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1700 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 1701 | key.offset = device->devid; |
0b86a832 CM |
1702 | |
1703 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 1704 | sizeof(*dev_item)); |
0b86a832 CM |
1705 | if (ret) |
1706 | goto out; | |
1707 | ||
1708 | leaf = path->nodes[0]; | |
1709 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1710 | ||
1711 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 1712 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
1713 | btrfs_set_device_type(leaf, dev_item, device->type); |
1714 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1715 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1716 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
7cc8e58d MX |
1717 | btrfs_set_device_total_bytes(leaf, dev_item, |
1718 | btrfs_device_get_disk_total_bytes(device)); | |
1719 | btrfs_set_device_bytes_used(leaf, dev_item, | |
1720 | btrfs_device_get_bytes_used(device)); | |
e17cade2 CM |
1721 | btrfs_set_device_group(leaf, dev_item, 0); |
1722 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
1723 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 1724 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 1725 | |
410ba3a2 | 1726 | ptr = btrfs_device_uuid(dev_item); |
e17cade2 | 1727 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
1473b24e | 1728 | ptr = btrfs_device_fsid(dev_item); |
0b246afa | 1729 | write_extent_buffer(leaf, fs_info->fsid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 1730 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 1731 | |
2b82032c | 1732 | ret = 0; |
0b86a832 CM |
1733 | out: |
1734 | btrfs_free_path(path); | |
1735 | return ret; | |
1736 | } | |
8f18cf13 | 1737 | |
5a1972bd QW |
1738 | /* |
1739 | * Function to update ctime/mtime for a given device path. | |
1740 | * Mainly used for ctime/mtime based probe like libblkid. | |
1741 | */ | |
da353f6b | 1742 | static void update_dev_time(const char *path_name) |
5a1972bd QW |
1743 | { |
1744 | struct file *filp; | |
1745 | ||
1746 | filp = filp_open(path_name, O_RDWR, 0); | |
98af592f | 1747 | if (IS_ERR(filp)) |
5a1972bd QW |
1748 | return; |
1749 | file_update_time(filp); | |
1750 | filp_close(filp, NULL); | |
5a1972bd QW |
1751 | } |
1752 | ||
5b4aacef | 1753 | static int btrfs_rm_dev_item(struct btrfs_fs_info *fs_info, |
a061fc8d CM |
1754 | struct btrfs_device *device) |
1755 | { | |
5b4aacef | 1756 | struct btrfs_root *root = fs_info->chunk_root; |
a061fc8d CM |
1757 | int ret; |
1758 | struct btrfs_path *path; | |
a061fc8d | 1759 | struct btrfs_key key; |
a061fc8d CM |
1760 | struct btrfs_trans_handle *trans; |
1761 | ||
a061fc8d CM |
1762 | path = btrfs_alloc_path(); |
1763 | if (!path) | |
1764 | return -ENOMEM; | |
1765 | ||
a22285a6 | 1766 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1767 | if (IS_ERR(trans)) { |
1768 | btrfs_free_path(path); | |
1769 | return PTR_ERR(trans); | |
1770 | } | |
a061fc8d CM |
1771 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1772 | key.type = BTRFS_DEV_ITEM_KEY; | |
1773 | key.offset = device->devid; | |
1774 | ||
1775 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1776 | if (ret < 0) | |
1777 | goto out; | |
1778 | ||
1779 | if (ret > 0) { | |
1780 | ret = -ENOENT; | |
1781 | goto out; | |
1782 | } | |
1783 | ||
1784 | ret = btrfs_del_item(trans, root, path); | |
1785 | if (ret) | |
1786 | goto out; | |
a061fc8d CM |
1787 | out: |
1788 | btrfs_free_path(path); | |
3a45bb20 | 1789 | btrfs_commit_transaction(trans); |
a061fc8d CM |
1790 | return ret; |
1791 | } | |
1792 | ||
3cc31a0d DS |
1793 | /* |
1794 | * Verify that @num_devices satisfies the RAID profile constraints in the whole | |
1795 | * filesystem. It's up to the caller to adjust that number regarding eg. device | |
1796 | * replace. | |
1797 | */ | |
1798 | static int btrfs_check_raid_min_devices(struct btrfs_fs_info *fs_info, | |
1799 | u64 num_devices) | |
a061fc8d | 1800 | { |
a061fc8d | 1801 | u64 all_avail; |
de98ced9 | 1802 | unsigned seq; |
418775a2 | 1803 | int i; |
a061fc8d | 1804 | |
de98ced9 | 1805 | do { |
bd45ffbc | 1806 | seq = read_seqbegin(&fs_info->profiles_lock); |
de98ced9 | 1807 | |
bd45ffbc AJ |
1808 | all_avail = fs_info->avail_data_alloc_bits | |
1809 | fs_info->avail_system_alloc_bits | | |
1810 | fs_info->avail_metadata_alloc_bits; | |
1811 | } while (read_seqretry(&fs_info->profiles_lock, seq)); | |
a061fc8d | 1812 | |
418775a2 DS |
1813 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
1814 | if (!(all_avail & btrfs_raid_group[i])) | |
1815 | continue; | |
a061fc8d | 1816 | |
418775a2 DS |
1817 | if (num_devices < btrfs_raid_array[i].devs_min) { |
1818 | int ret = btrfs_raid_mindev_error[i]; | |
bd45ffbc | 1819 | |
418775a2 DS |
1820 | if (ret) |
1821 | return ret; | |
1822 | } | |
53b381b3 DW |
1823 | } |
1824 | ||
bd45ffbc | 1825 | return 0; |
f1fa7f26 AJ |
1826 | } |
1827 | ||
88acff64 AJ |
1828 | struct btrfs_device *btrfs_find_next_active_device(struct btrfs_fs_devices *fs_devs, |
1829 | struct btrfs_device *device) | |
a061fc8d | 1830 | { |
2b82032c | 1831 | struct btrfs_device *next_device; |
88acff64 AJ |
1832 | |
1833 | list_for_each_entry(next_device, &fs_devs->devices, dev_list) { | |
1834 | if (next_device != device && | |
1835 | !next_device->missing && next_device->bdev) | |
1836 | return next_device; | |
1837 | } | |
1838 | ||
1839 | return NULL; | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * Helper function to check if the given device is part of s_bdev / latest_bdev | |
1844 | * and replace it with the provided or the next active device, in the context | |
1845 | * where this function called, there should be always be another device (or | |
1846 | * this_dev) which is active. | |
1847 | */ | |
1848 | void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info, | |
1849 | struct btrfs_device *device, struct btrfs_device *this_dev) | |
1850 | { | |
1851 | struct btrfs_device *next_device; | |
1852 | ||
1853 | if (this_dev) | |
1854 | next_device = this_dev; | |
1855 | else | |
1856 | next_device = btrfs_find_next_active_device(fs_info->fs_devices, | |
1857 | device); | |
1858 | ASSERT(next_device); | |
1859 | ||
1860 | if (fs_info->sb->s_bdev && | |
1861 | (fs_info->sb->s_bdev == device->bdev)) | |
1862 | fs_info->sb->s_bdev = next_device->bdev; | |
1863 | ||
1864 | if (fs_info->fs_devices->latest_bdev == device->bdev) | |
1865 | fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1866 | } | |
1867 | ||
da353f6b DS |
1868 | int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path, |
1869 | u64 devid) | |
f1fa7f26 AJ |
1870 | { |
1871 | struct btrfs_device *device; | |
1f78160c | 1872 | struct btrfs_fs_devices *cur_devices; |
2b82032c | 1873 | u64 num_devices; |
a061fc8d | 1874 | int ret = 0; |
1f78160c | 1875 | bool clear_super = false; |
a061fc8d | 1876 | |
a061fc8d CM |
1877 | mutex_lock(&uuid_mutex); |
1878 | ||
0b246afa JM |
1879 | num_devices = fs_info->fs_devices->num_devices; |
1880 | btrfs_dev_replace_lock(&fs_info->dev_replace, 0); | |
1881 | if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) { | |
8dabb742 SB |
1882 | WARN_ON(num_devices < 1); |
1883 | num_devices--; | |
1884 | } | |
0b246afa | 1885 | btrfs_dev_replace_unlock(&fs_info->dev_replace, 0); |
8dabb742 | 1886 | |
0b246afa | 1887 | ret = btrfs_check_raid_min_devices(fs_info, num_devices - 1); |
f1fa7f26 | 1888 | if (ret) |
a061fc8d | 1889 | goto out; |
a061fc8d | 1890 | |
2ff7e61e JM |
1891 | ret = btrfs_find_device_by_devspec(fs_info, devid, device_path, |
1892 | &device); | |
24fc572f | 1893 | if (ret) |
53b381b3 | 1894 | goto out; |
dfe25020 | 1895 | |
63a212ab | 1896 | if (device->is_tgtdev_for_dev_replace) { |
183860f6 | 1897 | ret = BTRFS_ERROR_DEV_TGT_REPLACE; |
24fc572f | 1898 | goto out; |
63a212ab SB |
1899 | } |
1900 | ||
0b246afa | 1901 | if (device->writeable && fs_info->fs_devices->rw_devices == 1) { |
183860f6 | 1902 | ret = BTRFS_ERROR_DEV_ONLY_WRITABLE; |
24fc572f | 1903 | goto out; |
2b82032c YZ |
1904 | } |
1905 | ||
1906 | if (device->writeable) { | |
34441361 | 1907 | mutex_lock(&fs_info->chunk_mutex); |
2b82032c | 1908 | list_del_init(&device->dev_alloc_list); |
c3929c36 | 1909 | device->fs_devices->rw_devices--; |
34441361 | 1910 | mutex_unlock(&fs_info->chunk_mutex); |
1f78160c | 1911 | clear_super = true; |
dfe25020 | 1912 | } |
a061fc8d | 1913 | |
d7901554 | 1914 | mutex_unlock(&uuid_mutex); |
a061fc8d | 1915 | ret = btrfs_shrink_device(device, 0); |
d7901554 | 1916 | mutex_lock(&uuid_mutex); |
a061fc8d | 1917 | if (ret) |
9b3517e9 | 1918 | goto error_undo; |
a061fc8d | 1919 | |
63a212ab SB |
1920 | /* |
1921 | * TODO: the superblock still includes this device in its num_devices | |
1922 | * counter although write_all_supers() is not locked out. This | |
1923 | * could give a filesystem state which requires a degraded mount. | |
1924 | */ | |
0b246afa | 1925 | ret = btrfs_rm_dev_item(fs_info, device); |
a061fc8d | 1926 | if (ret) |
9b3517e9 | 1927 | goto error_undo; |
a061fc8d | 1928 | |
2b82032c | 1929 | device->in_fs_metadata = 0; |
0b246afa | 1930 | btrfs_scrub_cancel_dev(fs_info, device); |
e5e9a520 CM |
1931 | |
1932 | /* | |
1933 | * the device list mutex makes sure that we don't change | |
1934 | * the device list while someone else is writing out all | |
d7306801 FDBM |
1935 | * the device supers. Whoever is writing all supers, should |
1936 | * lock the device list mutex before getting the number of | |
1937 | * devices in the super block (super_copy). Conversely, | |
1938 | * whoever updates the number of devices in the super block | |
1939 | * (super_copy) should hold the device list mutex. | |
e5e9a520 | 1940 | */ |
1f78160c XG |
1941 | |
1942 | cur_devices = device->fs_devices; | |
0b246afa | 1943 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
1f78160c | 1944 | list_del_rcu(&device->dev_list); |
e5e9a520 | 1945 | |
e4404d6e | 1946 | device->fs_devices->num_devices--; |
02db0844 | 1947 | device->fs_devices->total_devices--; |
2b82032c | 1948 | |
cd02dca5 | 1949 | if (device->missing) |
3a7d55c8 | 1950 | device->fs_devices->missing_devices--; |
cd02dca5 | 1951 | |
0b246afa | 1952 | btrfs_assign_next_active_device(fs_info, device, NULL); |
2b82032c | 1953 | |
0bfaa9c5 | 1954 | if (device->bdev) { |
e4404d6e | 1955 | device->fs_devices->open_devices--; |
0bfaa9c5 | 1956 | /* remove sysfs entry */ |
0b246afa | 1957 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, device); |
0bfaa9c5 | 1958 | } |
99994cde | 1959 | |
0b246afa JM |
1960 | num_devices = btrfs_super_num_devices(fs_info->super_copy) - 1; |
1961 | btrfs_set_super_num_devices(fs_info->super_copy, num_devices); | |
1962 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
2b82032c | 1963 | |
cea67ab9 JM |
1964 | /* |
1965 | * at this point, the device is zero sized and detached from | |
1966 | * the devices list. All that's left is to zero out the old | |
1967 | * supers and free the device. | |
1968 | */ | |
1969 | if (device->writeable) | |
1970 | btrfs_scratch_superblocks(device->bdev, device->name->str); | |
1971 | ||
1972 | btrfs_close_bdev(device); | |
1973 | call_rcu(&device->rcu, free_device); | |
1974 | ||
1f78160c | 1975 | if (cur_devices->open_devices == 0) { |
e4404d6e | 1976 | struct btrfs_fs_devices *fs_devices; |
0b246afa | 1977 | fs_devices = fs_info->fs_devices; |
e4404d6e | 1978 | while (fs_devices) { |
8321cf25 RS |
1979 | if (fs_devices->seed == cur_devices) { |
1980 | fs_devices->seed = cur_devices->seed; | |
e4404d6e | 1981 | break; |
8321cf25 | 1982 | } |
e4404d6e | 1983 | fs_devices = fs_devices->seed; |
2b82032c | 1984 | } |
1f78160c | 1985 | cur_devices->seed = NULL; |
1f78160c | 1986 | __btrfs_close_devices(cur_devices); |
1f78160c | 1987 | free_fs_devices(cur_devices); |
2b82032c YZ |
1988 | } |
1989 | ||
0b246afa JM |
1990 | fs_info->num_tolerated_disk_barrier_failures = |
1991 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); | |
5af3e8cc | 1992 | |
a061fc8d CM |
1993 | out: |
1994 | mutex_unlock(&uuid_mutex); | |
a061fc8d | 1995 | return ret; |
24fc572f | 1996 | |
9b3517e9 ID |
1997 | error_undo: |
1998 | if (device->writeable) { | |
34441361 | 1999 | mutex_lock(&fs_info->chunk_mutex); |
9b3517e9 | 2000 | list_add(&device->dev_alloc_list, |
0b246afa | 2001 | &fs_info->fs_devices->alloc_list); |
c3929c36 | 2002 | device->fs_devices->rw_devices++; |
34441361 | 2003 | mutex_unlock(&fs_info->chunk_mutex); |
9b3517e9 | 2004 | } |
24fc572f | 2005 | goto out; |
a061fc8d CM |
2006 | } |
2007 | ||
084b6e7c QW |
2008 | void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_fs_info *fs_info, |
2009 | struct btrfs_device *srcdev) | |
e93c89c1 | 2010 | { |
d51908ce AJ |
2011 | struct btrfs_fs_devices *fs_devices; |
2012 | ||
e93c89c1 | 2013 | WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex)); |
1357272f | 2014 | |
25e8e911 AJ |
2015 | /* |
2016 | * in case of fs with no seed, srcdev->fs_devices will point | |
2017 | * to fs_devices of fs_info. However when the dev being replaced is | |
2018 | * a seed dev it will point to the seed's local fs_devices. In short | |
2019 | * srcdev will have its correct fs_devices in both the cases. | |
2020 | */ | |
2021 | fs_devices = srcdev->fs_devices; | |
d51908ce | 2022 | |
e93c89c1 SB |
2023 | list_del_rcu(&srcdev->dev_list); |
2024 | list_del_rcu(&srcdev->dev_alloc_list); | |
d51908ce | 2025 | fs_devices->num_devices--; |
82372bc8 | 2026 | if (srcdev->missing) |
d51908ce | 2027 | fs_devices->missing_devices--; |
e93c89c1 | 2028 | |
48b3b9d4 | 2029 | if (srcdev->writeable) |
82372bc8 | 2030 | fs_devices->rw_devices--; |
1357272f | 2031 | |
82372bc8 | 2032 | if (srcdev->bdev) |
d51908ce | 2033 | fs_devices->open_devices--; |
084b6e7c QW |
2034 | } |
2035 | ||
2036 | void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info, | |
2037 | struct btrfs_device *srcdev) | |
2038 | { | |
2039 | struct btrfs_fs_devices *fs_devices = srcdev->fs_devices; | |
e93c89c1 | 2040 | |
48b3b9d4 AJ |
2041 | if (srcdev->writeable) { |
2042 | /* zero out the old super if it is writable */ | |
2043 | btrfs_scratch_superblocks(srcdev->bdev, srcdev->name->str); | |
2044 | } | |
14238819 AJ |
2045 | |
2046 | btrfs_close_bdev(srcdev); | |
2047 | ||
e93c89c1 | 2048 | call_rcu(&srcdev->rcu, free_device); |
94d5f0c2 AJ |
2049 | |
2050 | /* | |
2051 | * unless fs_devices is seed fs, num_devices shouldn't go | |
2052 | * zero | |
2053 | */ | |
2054 | BUG_ON(!fs_devices->num_devices && !fs_devices->seeding); | |
2055 | ||
2056 | /* if this is no devs we rather delete the fs_devices */ | |
2057 | if (!fs_devices->num_devices) { | |
2058 | struct btrfs_fs_devices *tmp_fs_devices; | |
2059 | ||
2060 | tmp_fs_devices = fs_info->fs_devices; | |
2061 | while (tmp_fs_devices) { | |
2062 | if (tmp_fs_devices->seed == fs_devices) { | |
2063 | tmp_fs_devices->seed = fs_devices->seed; | |
2064 | break; | |
2065 | } | |
2066 | tmp_fs_devices = tmp_fs_devices->seed; | |
2067 | } | |
2068 | fs_devices->seed = NULL; | |
8bef8401 AJ |
2069 | __btrfs_close_devices(fs_devices); |
2070 | free_fs_devices(fs_devices); | |
94d5f0c2 | 2071 | } |
e93c89c1 SB |
2072 | } |
2073 | ||
2074 | void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
2075 | struct btrfs_device *tgtdev) | |
2076 | { | |
67a2c45e | 2077 | mutex_lock(&uuid_mutex); |
e93c89c1 SB |
2078 | WARN_ON(!tgtdev); |
2079 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
d2ff1b20 | 2080 | |
32576040 | 2081 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, tgtdev); |
d2ff1b20 | 2082 | |
779bf3fe | 2083 | if (tgtdev->bdev) |
e93c89c1 | 2084 | fs_info->fs_devices->open_devices--; |
779bf3fe | 2085 | |
e93c89c1 | 2086 | fs_info->fs_devices->num_devices--; |
e93c89c1 | 2087 | |
88acff64 | 2088 | btrfs_assign_next_active_device(fs_info, tgtdev, NULL); |
e93c89c1 | 2089 | |
e93c89c1 | 2090 | list_del_rcu(&tgtdev->dev_list); |
e93c89c1 SB |
2091 | |
2092 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
67a2c45e | 2093 | mutex_unlock(&uuid_mutex); |
779bf3fe AJ |
2094 | |
2095 | /* | |
2096 | * The update_dev_time() with in btrfs_scratch_superblocks() | |
2097 | * may lead to a call to btrfs_show_devname() which will try | |
2098 | * to hold device_list_mutex. And here this device | |
2099 | * is already out of device list, so we don't have to hold | |
2100 | * the device_list_mutex lock. | |
2101 | */ | |
2102 | btrfs_scratch_superblocks(tgtdev->bdev, tgtdev->name->str); | |
14238819 AJ |
2103 | |
2104 | btrfs_close_bdev(tgtdev); | |
779bf3fe | 2105 | call_rcu(&tgtdev->rcu, free_device); |
e93c89c1 SB |
2106 | } |
2107 | ||
2ff7e61e | 2108 | static int btrfs_find_device_by_path(struct btrfs_fs_info *fs_info, |
da353f6b | 2109 | const char *device_path, |
48a3b636 | 2110 | struct btrfs_device **device) |
7ba15b7d SB |
2111 | { |
2112 | int ret = 0; | |
2113 | struct btrfs_super_block *disk_super; | |
2114 | u64 devid; | |
2115 | u8 *dev_uuid; | |
2116 | struct block_device *bdev; | |
2117 | struct buffer_head *bh; | |
2118 | ||
2119 | *device = NULL; | |
2120 | ret = btrfs_get_bdev_and_sb(device_path, FMODE_READ, | |
0b246afa | 2121 | fs_info->bdev_holder, 0, &bdev, &bh); |
7ba15b7d SB |
2122 | if (ret) |
2123 | return ret; | |
2124 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
2125 | devid = btrfs_stack_device_id(&disk_super->dev_item); | |
2126 | dev_uuid = disk_super->dev_item.uuid; | |
0b246afa | 2127 | *device = btrfs_find_device(fs_info, devid, dev_uuid, disk_super->fsid); |
7ba15b7d SB |
2128 | brelse(bh); |
2129 | if (!*device) | |
2130 | ret = -ENOENT; | |
2131 | blkdev_put(bdev, FMODE_READ); | |
2132 | return ret; | |
2133 | } | |
2134 | ||
2ff7e61e | 2135 | int btrfs_find_device_missing_or_by_path(struct btrfs_fs_info *fs_info, |
da353f6b | 2136 | const char *device_path, |
7ba15b7d SB |
2137 | struct btrfs_device **device) |
2138 | { | |
2139 | *device = NULL; | |
2140 | if (strcmp(device_path, "missing") == 0) { | |
2141 | struct list_head *devices; | |
2142 | struct btrfs_device *tmp; | |
2143 | ||
0b246afa | 2144 | devices = &fs_info->fs_devices->devices; |
7ba15b7d SB |
2145 | /* |
2146 | * It is safe to read the devices since the volume_mutex | |
2147 | * is held by the caller. | |
2148 | */ | |
2149 | list_for_each_entry(tmp, devices, dev_list) { | |
2150 | if (tmp->in_fs_metadata && !tmp->bdev) { | |
2151 | *device = tmp; | |
2152 | break; | |
2153 | } | |
2154 | } | |
2155 | ||
d74a6259 AJ |
2156 | if (!*device) |
2157 | return BTRFS_ERROR_DEV_MISSING_NOT_FOUND; | |
7ba15b7d SB |
2158 | |
2159 | return 0; | |
2160 | } else { | |
2ff7e61e | 2161 | return btrfs_find_device_by_path(fs_info, device_path, device); |
7ba15b7d SB |
2162 | } |
2163 | } | |
2164 | ||
5c5c0df0 DS |
2165 | /* |
2166 | * Lookup a device given by device id, or the path if the id is 0. | |
2167 | */ | |
2ff7e61e | 2168 | int btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, u64 devid, |
da353f6b DS |
2169 | const char *devpath, |
2170 | struct btrfs_device **device) | |
24e0474b AJ |
2171 | { |
2172 | int ret; | |
2173 | ||
5c5c0df0 | 2174 | if (devid) { |
24e0474b | 2175 | ret = 0; |
0b246afa | 2176 | *device = btrfs_find_device(fs_info, devid, NULL, NULL); |
24e0474b AJ |
2177 | if (!*device) |
2178 | ret = -ENOENT; | |
2179 | } else { | |
5c5c0df0 | 2180 | if (!devpath || !devpath[0]) |
b3d1b153 AJ |
2181 | return -EINVAL; |
2182 | ||
2ff7e61e | 2183 | ret = btrfs_find_device_missing_or_by_path(fs_info, devpath, |
24e0474b AJ |
2184 | device); |
2185 | } | |
2186 | return ret; | |
2187 | } | |
2188 | ||
2b82032c YZ |
2189 | /* |
2190 | * does all the dirty work required for changing file system's UUID. | |
2191 | */ | |
2ff7e61e | 2192 | static int btrfs_prepare_sprout(struct btrfs_fs_info *fs_info) |
2b82032c | 2193 | { |
0b246afa | 2194 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
2b82032c | 2195 | struct btrfs_fs_devices *old_devices; |
e4404d6e | 2196 | struct btrfs_fs_devices *seed_devices; |
0b246afa | 2197 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
2b82032c YZ |
2198 | struct btrfs_device *device; |
2199 | u64 super_flags; | |
2200 | ||
2201 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 2202 | if (!fs_devices->seeding) |
2b82032c YZ |
2203 | return -EINVAL; |
2204 | ||
2208a378 ID |
2205 | seed_devices = __alloc_fs_devices(); |
2206 | if (IS_ERR(seed_devices)) | |
2207 | return PTR_ERR(seed_devices); | |
2b82032c | 2208 | |
e4404d6e YZ |
2209 | old_devices = clone_fs_devices(fs_devices); |
2210 | if (IS_ERR(old_devices)) { | |
2211 | kfree(seed_devices); | |
2212 | return PTR_ERR(old_devices); | |
2b82032c | 2213 | } |
e4404d6e | 2214 | |
2b82032c YZ |
2215 | list_add(&old_devices->list, &fs_uuids); |
2216 | ||
e4404d6e YZ |
2217 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
2218 | seed_devices->opened = 1; | |
2219 | INIT_LIST_HEAD(&seed_devices->devices); | |
2220 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
e5e9a520 | 2221 | mutex_init(&seed_devices->device_list_mutex); |
c9513edb | 2222 | |
0b246afa | 2223 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
1f78160c XG |
2224 | list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices, |
2225 | synchronize_rcu); | |
2196d6e8 MX |
2226 | list_for_each_entry(device, &seed_devices->devices, dev_list) |
2227 | device->fs_devices = seed_devices; | |
c9513edb | 2228 | |
34441361 | 2229 | mutex_lock(&fs_info->chunk_mutex); |
e4404d6e | 2230 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); |
34441361 | 2231 | mutex_unlock(&fs_info->chunk_mutex); |
e4404d6e | 2232 | |
2b82032c YZ |
2233 | fs_devices->seeding = 0; |
2234 | fs_devices->num_devices = 0; | |
2235 | fs_devices->open_devices = 0; | |
69611ac8 | 2236 | fs_devices->missing_devices = 0; |
69611ac8 | 2237 | fs_devices->rotating = 0; |
e4404d6e | 2238 | fs_devices->seed = seed_devices; |
2b82032c YZ |
2239 | |
2240 | generate_random_uuid(fs_devices->fsid); | |
0b246afa | 2241 | memcpy(fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); |
2b82032c | 2242 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); |
0b246afa | 2243 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
f7171750 | 2244 | |
2b82032c YZ |
2245 | super_flags = btrfs_super_flags(disk_super) & |
2246 | ~BTRFS_SUPER_FLAG_SEEDING; | |
2247 | btrfs_set_super_flags(disk_super, super_flags); | |
2248 | ||
2249 | return 0; | |
2250 | } | |
2251 | ||
2252 | /* | |
01327610 | 2253 | * Store the expected generation for seed devices in device items. |
2b82032c YZ |
2254 | */ |
2255 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
5b4aacef | 2256 | struct btrfs_fs_info *fs_info) |
2b82032c | 2257 | { |
5b4aacef | 2258 | struct btrfs_root *root = fs_info->chunk_root; |
2b82032c YZ |
2259 | struct btrfs_path *path; |
2260 | struct extent_buffer *leaf; | |
2261 | struct btrfs_dev_item *dev_item; | |
2262 | struct btrfs_device *device; | |
2263 | struct btrfs_key key; | |
2264 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
2265 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
2266 | u64 devid; | |
2267 | int ret; | |
2268 | ||
2269 | path = btrfs_alloc_path(); | |
2270 | if (!path) | |
2271 | return -ENOMEM; | |
2272 | ||
2b82032c YZ |
2273 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
2274 | key.offset = 0; | |
2275 | key.type = BTRFS_DEV_ITEM_KEY; | |
2276 | ||
2277 | while (1) { | |
2278 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
2279 | if (ret < 0) | |
2280 | goto error; | |
2281 | ||
2282 | leaf = path->nodes[0]; | |
2283 | next_slot: | |
2284 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
2285 | ret = btrfs_next_leaf(root, path); | |
2286 | if (ret > 0) | |
2287 | break; | |
2288 | if (ret < 0) | |
2289 | goto error; | |
2290 | leaf = path->nodes[0]; | |
2291 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 2292 | btrfs_release_path(path); |
2b82032c YZ |
2293 | continue; |
2294 | } | |
2295 | ||
2296 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
2297 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
2298 | key.type != BTRFS_DEV_ITEM_KEY) | |
2299 | break; | |
2300 | ||
2301 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
2302 | struct btrfs_dev_item); | |
2303 | devid = btrfs_device_id(leaf, dev_item); | |
410ba3a2 | 2304 | read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item), |
2b82032c | 2305 | BTRFS_UUID_SIZE); |
1473b24e | 2306 | read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item), |
2b82032c | 2307 | BTRFS_UUID_SIZE); |
0b246afa | 2308 | device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid); |
79787eaa | 2309 | BUG_ON(!device); /* Logic error */ |
2b82032c YZ |
2310 | |
2311 | if (device->fs_devices->seeding) { | |
2312 | btrfs_set_device_generation(leaf, dev_item, | |
2313 | device->generation); | |
2314 | btrfs_mark_buffer_dirty(leaf); | |
2315 | } | |
2316 | ||
2317 | path->slots[0]++; | |
2318 | goto next_slot; | |
2319 | } | |
2320 | ret = 0; | |
2321 | error: | |
2322 | btrfs_free_path(path); | |
2323 | return ret; | |
2324 | } | |
2325 | ||
da353f6b | 2326 | int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path) |
788f20eb | 2327 | { |
5112febb | 2328 | struct btrfs_root *root = fs_info->dev_root; |
d5e2003c | 2329 | struct request_queue *q; |
788f20eb CM |
2330 | struct btrfs_trans_handle *trans; |
2331 | struct btrfs_device *device; | |
2332 | struct block_device *bdev; | |
788f20eb | 2333 | struct list_head *devices; |
0b246afa | 2334 | struct super_block *sb = fs_info->sb; |
606686ee | 2335 | struct rcu_string *name; |
3c1dbdf5 | 2336 | u64 tmp; |
2b82032c | 2337 | int seeding_dev = 0; |
788f20eb CM |
2338 | int ret = 0; |
2339 | ||
0b246afa | 2340 | if ((sb->s_flags & MS_RDONLY) && !fs_info->fs_devices->seeding) |
f8c5d0b4 | 2341 | return -EROFS; |
788f20eb | 2342 | |
a5d16333 | 2343 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, |
0b246afa | 2344 | fs_info->bdev_holder); |
7f59203a JB |
2345 | if (IS_ERR(bdev)) |
2346 | return PTR_ERR(bdev); | |
a2135011 | 2347 | |
0b246afa | 2348 | if (fs_info->fs_devices->seeding) { |
2b82032c YZ |
2349 | seeding_dev = 1; |
2350 | down_write(&sb->s_umount); | |
2351 | mutex_lock(&uuid_mutex); | |
2352 | } | |
2353 | ||
8c8bee1d | 2354 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
a2135011 | 2355 | |
0b246afa | 2356 | devices = &fs_info->fs_devices->devices; |
d25628bd | 2357 | |
0b246afa | 2358 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
c6e30871 | 2359 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
2360 | if (device->bdev == bdev) { |
2361 | ret = -EEXIST; | |
d25628bd | 2362 | mutex_unlock( |
0b246afa | 2363 | &fs_info->fs_devices->device_list_mutex); |
2b82032c | 2364 | goto error; |
788f20eb CM |
2365 | } |
2366 | } | |
0b246afa | 2367 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
788f20eb | 2368 | |
0b246afa | 2369 | device = btrfs_alloc_device(fs_info, NULL, NULL); |
12bd2fc0 | 2370 | if (IS_ERR(device)) { |
788f20eb | 2371 | /* we can safely leave the fs_devices entry around */ |
12bd2fc0 | 2372 | ret = PTR_ERR(device); |
2b82032c | 2373 | goto error; |
788f20eb CM |
2374 | } |
2375 | ||
78f2c9e6 | 2376 | name = rcu_string_strdup(device_path, GFP_KERNEL); |
606686ee | 2377 | if (!name) { |
788f20eb | 2378 | kfree(device); |
2b82032c YZ |
2379 | ret = -ENOMEM; |
2380 | goto error; | |
788f20eb | 2381 | } |
606686ee | 2382 | rcu_assign_pointer(device->name, name); |
2b82032c | 2383 | |
a22285a6 | 2384 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 2385 | if (IS_ERR(trans)) { |
606686ee | 2386 | rcu_string_free(device->name); |
98d5dc13 TI |
2387 | kfree(device); |
2388 | ret = PTR_ERR(trans); | |
2389 | goto error; | |
2390 | } | |
2391 | ||
d5e2003c JB |
2392 | q = bdev_get_queue(bdev); |
2393 | if (blk_queue_discard(q)) | |
2394 | device->can_discard = 1; | |
2b82032c | 2395 | device->writeable = 1; |
2b82032c | 2396 | device->generation = trans->transid; |
0b246afa JM |
2397 | device->io_width = fs_info->sectorsize; |
2398 | device->io_align = fs_info->sectorsize; | |
2399 | device->sector_size = fs_info->sectorsize; | |
7dfb8be1 NB |
2400 | device->total_bytes = round_down(i_size_read(bdev->bd_inode), |
2401 | fs_info->sectorsize); | |
2cc3c559 | 2402 | device->disk_total_bytes = device->total_bytes; |
935e5cc9 | 2403 | device->commit_total_bytes = device->total_bytes; |
fb456252 | 2404 | device->fs_info = fs_info; |
788f20eb | 2405 | device->bdev = bdev; |
dfe25020 | 2406 | device->in_fs_metadata = 1; |
63a212ab | 2407 | device->is_tgtdev_for_dev_replace = 0; |
fb01aa85 | 2408 | device->mode = FMODE_EXCL; |
27087f37 | 2409 | device->dev_stats_valid = 1; |
2b82032c | 2410 | set_blocksize(device->bdev, 4096); |
788f20eb | 2411 | |
2b82032c YZ |
2412 | if (seeding_dev) { |
2413 | sb->s_flags &= ~MS_RDONLY; | |
2ff7e61e | 2414 | ret = btrfs_prepare_sprout(fs_info); |
79787eaa | 2415 | BUG_ON(ret); /* -ENOMEM */ |
2b82032c | 2416 | } |
788f20eb | 2417 | |
0b246afa | 2418 | device->fs_devices = fs_info->fs_devices; |
e5e9a520 | 2419 | |
0b246afa | 2420 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
34441361 | 2421 | mutex_lock(&fs_info->chunk_mutex); |
0b246afa | 2422 | list_add_rcu(&device->dev_list, &fs_info->fs_devices->devices); |
2b82032c | 2423 | list_add(&device->dev_alloc_list, |
0b246afa JM |
2424 | &fs_info->fs_devices->alloc_list); |
2425 | fs_info->fs_devices->num_devices++; | |
2426 | fs_info->fs_devices->open_devices++; | |
2427 | fs_info->fs_devices->rw_devices++; | |
2428 | fs_info->fs_devices->total_devices++; | |
2429 | fs_info->fs_devices->total_rw_bytes += device->total_bytes; | |
325cd4ba | 2430 | |
a5ed45f8 | 2431 | atomic64_add(device->total_bytes, &fs_info->free_chunk_space); |
2bf64758 | 2432 | |
e884f4f0 | 2433 | if (!blk_queue_nonrot(q)) |
0b246afa | 2434 | fs_info->fs_devices->rotating = 1; |
c289811c | 2435 | |
0b246afa JM |
2436 | tmp = btrfs_super_total_bytes(fs_info->super_copy); |
2437 | btrfs_set_super_total_bytes(fs_info->super_copy, | |
7dfb8be1 | 2438 | round_down(tmp + device->total_bytes, fs_info->sectorsize)); |
788f20eb | 2439 | |
0b246afa JM |
2440 | tmp = btrfs_super_num_devices(fs_info->super_copy); |
2441 | btrfs_set_super_num_devices(fs_info->super_copy, tmp + 1); | |
0d39376a AJ |
2442 | |
2443 | /* add sysfs device entry */ | |
0b246afa | 2444 | btrfs_sysfs_add_device_link(fs_info->fs_devices, device); |
0d39376a | 2445 | |
2196d6e8 MX |
2446 | /* |
2447 | * we've got more storage, clear any full flags on the space | |
2448 | * infos | |
2449 | */ | |
0b246afa | 2450 | btrfs_clear_space_info_full(fs_info); |
2196d6e8 | 2451 | |
34441361 | 2452 | mutex_unlock(&fs_info->chunk_mutex); |
0b246afa | 2453 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
788f20eb | 2454 | |
2b82032c | 2455 | if (seeding_dev) { |
34441361 | 2456 | mutex_lock(&fs_info->chunk_mutex); |
e4a4dce7 | 2457 | ret = init_first_rw_device(trans, fs_info); |
34441361 | 2458 | mutex_unlock(&fs_info->chunk_mutex); |
005d6427 | 2459 | if (ret) { |
66642832 | 2460 | btrfs_abort_transaction(trans, ret); |
79787eaa | 2461 | goto error_trans; |
005d6427 | 2462 | } |
2196d6e8 MX |
2463 | } |
2464 | ||
0b246afa | 2465 | ret = btrfs_add_device(trans, fs_info, device); |
2196d6e8 | 2466 | if (ret) { |
66642832 | 2467 | btrfs_abort_transaction(trans, ret); |
2196d6e8 MX |
2468 | goto error_trans; |
2469 | } | |
2470 | ||
2471 | if (seeding_dev) { | |
2472 | char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; | |
2473 | ||
0b246afa | 2474 | ret = btrfs_finish_sprout(trans, fs_info); |
005d6427 | 2475 | if (ret) { |
66642832 | 2476 | btrfs_abort_transaction(trans, ret); |
79787eaa | 2477 | goto error_trans; |
005d6427 | 2478 | } |
b2373f25 AJ |
2479 | |
2480 | /* Sprouting would change fsid of the mounted root, | |
2481 | * so rename the fsid on the sysfs | |
2482 | */ | |
2483 | snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", | |
0b246afa JM |
2484 | fs_info->fsid); |
2485 | if (kobject_rename(&fs_info->fs_devices->fsid_kobj, fsid_buf)) | |
2486 | btrfs_warn(fs_info, | |
2487 | "sysfs: failed to create fsid for sprout"); | |
2b82032c YZ |
2488 | } |
2489 | ||
0b246afa JM |
2490 | fs_info->num_tolerated_disk_barrier_failures = |
2491 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); | |
3a45bb20 | 2492 | ret = btrfs_commit_transaction(trans); |
a2135011 | 2493 | |
2b82032c YZ |
2494 | if (seeding_dev) { |
2495 | mutex_unlock(&uuid_mutex); | |
2496 | up_write(&sb->s_umount); | |
788f20eb | 2497 | |
79787eaa JM |
2498 | if (ret) /* transaction commit */ |
2499 | return ret; | |
2500 | ||
2ff7e61e | 2501 | ret = btrfs_relocate_sys_chunks(fs_info); |
79787eaa | 2502 | if (ret < 0) |
0b246afa | 2503 | btrfs_handle_fs_error(fs_info, ret, |
5d163e0e | 2504 | "Failed to relocate sys chunks after device initialization. This can be fixed using the \"btrfs balance\" command."); |
671415b7 MX |
2505 | trans = btrfs_attach_transaction(root); |
2506 | if (IS_ERR(trans)) { | |
2507 | if (PTR_ERR(trans) == -ENOENT) | |
2508 | return 0; | |
2509 | return PTR_ERR(trans); | |
2510 | } | |
3a45bb20 | 2511 | ret = btrfs_commit_transaction(trans); |
2b82032c | 2512 | } |
c9e9f97b | 2513 | |
5a1972bd QW |
2514 | /* Update ctime/mtime for libblkid */ |
2515 | update_dev_time(device_path); | |
2b82032c | 2516 | return ret; |
79787eaa JM |
2517 | |
2518 | error_trans: | |
3a45bb20 | 2519 | btrfs_end_transaction(trans); |
606686ee | 2520 | rcu_string_free(device->name); |
0b246afa | 2521 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, device); |
79787eaa | 2522 | kfree(device); |
2b82032c | 2523 | error: |
e525fd89 | 2524 | blkdev_put(bdev, FMODE_EXCL); |
2b82032c YZ |
2525 | if (seeding_dev) { |
2526 | mutex_unlock(&uuid_mutex); | |
2527 | up_write(&sb->s_umount); | |
2528 | } | |
c9e9f97b | 2529 | return ret; |
788f20eb CM |
2530 | } |
2531 | ||
2ff7e61e | 2532 | int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, |
da353f6b | 2533 | const char *device_path, |
1c43366d | 2534 | struct btrfs_device *srcdev, |
e93c89c1 SB |
2535 | struct btrfs_device **device_out) |
2536 | { | |
2537 | struct request_queue *q; | |
2538 | struct btrfs_device *device; | |
2539 | struct block_device *bdev; | |
e93c89c1 SB |
2540 | struct list_head *devices; |
2541 | struct rcu_string *name; | |
12bd2fc0 | 2542 | u64 devid = BTRFS_DEV_REPLACE_DEVID; |
e93c89c1 SB |
2543 | int ret = 0; |
2544 | ||
2545 | *device_out = NULL; | |
1c43366d MX |
2546 | if (fs_info->fs_devices->seeding) { |
2547 | btrfs_err(fs_info, "the filesystem is a seed filesystem!"); | |
e93c89c1 | 2548 | return -EINVAL; |
1c43366d | 2549 | } |
e93c89c1 SB |
2550 | |
2551 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, | |
2552 | fs_info->bdev_holder); | |
1c43366d MX |
2553 | if (IS_ERR(bdev)) { |
2554 | btrfs_err(fs_info, "target device %s is invalid!", device_path); | |
e93c89c1 | 2555 | return PTR_ERR(bdev); |
1c43366d | 2556 | } |
e93c89c1 SB |
2557 | |
2558 | filemap_write_and_wait(bdev->bd_inode->i_mapping); | |
2559 | ||
2560 | devices = &fs_info->fs_devices->devices; | |
2561 | list_for_each_entry(device, devices, dev_list) { | |
2562 | if (device->bdev == bdev) { | |
5d163e0e JM |
2563 | btrfs_err(fs_info, |
2564 | "target device is in the filesystem!"); | |
e93c89c1 SB |
2565 | ret = -EEXIST; |
2566 | goto error; | |
2567 | } | |
2568 | } | |
2569 | ||
1c43366d | 2570 | |
7cc8e58d MX |
2571 | if (i_size_read(bdev->bd_inode) < |
2572 | btrfs_device_get_total_bytes(srcdev)) { | |
5d163e0e JM |
2573 | btrfs_err(fs_info, |
2574 | "target device is smaller than source device!"); | |
1c43366d MX |
2575 | ret = -EINVAL; |
2576 | goto error; | |
2577 | } | |
2578 | ||
2579 | ||
12bd2fc0 ID |
2580 | device = btrfs_alloc_device(NULL, &devid, NULL); |
2581 | if (IS_ERR(device)) { | |
2582 | ret = PTR_ERR(device); | |
e93c89c1 SB |
2583 | goto error; |
2584 | } | |
2585 | ||
6165572c | 2586 | name = rcu_string_strdup(device_path, GFP_KERNEL); |
e93c89c1 SB |
2587 | if (!name) { |
2588 | kfree(device); | |
2589 | ret = -ENOMEM; | |
2590 | goto error; | |
2591 | } | |
2592 | rcu_assign_pointer(device->name, name); | |
2593 | ||
2594 | q = bdev_get_queue(bdev); | |
2595 | if (blk_queue_discard(q)) | |
2596 | device->can_discard = 1; | |
0b246afa | 2597 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
e93c89c1 | 2598 | device->writeable = 1; |
e93c89c1 | 2599 | device->generation = 0; |
0b246afa JM |
2600 | device->io_width = fs_info->sectorsize; |
2601 | device->io_align = fs_info->sectorsize; | |
2602 | device->sector_size = fs_info->sectorsize; | |
7cc8e58d MX |
2603 | device->total_bytes = btrfs_device_get_total_bytes(srcdev); |
2604 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); | |
2605 | device->bytes_used = btrfs_device_get_bytes_used(srcdev); | |
935e5cc9 MX |
2606 | ASSERT(list_empty(&srcdev->resized_list)); |
2607 | device->commit_total_bytes = srcdev->commit_total_bytes; | |
ce7213c7 | 2608 | device->commit_bytes_used = device->bytes_used; |
fb456252 | 2609 | device->fs_info = fs_info; |
e93c89c1 SB |
2610 | device->bdev = bdev; |
2611 | device->in_fs_metadata = 1; | |
2612 | device->is_tgtdev_for_dev_replace = 1; | |
2613 | device->mode = FMODE_EXCL; | |
27087f37 | 2614 | device->dev_stats_valid = 1; |
e93c89c1 SB |
2615 | set_blocksize(device->bdev, 4096); |
2616 | device->fs_devices = fs_info->fs_devices; | |
2617 | list_add(&device->dev_list, &fs_info->fs_devices->devices); | |
2618 | fs_info->fs_devices->num_devices++; | |
2619 | fs_info->fs_devices->open_devices++; | |
0b246afa | 2620 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
e93c89c1 SB |
2621 | |
2622 | *device_out = device; | |
2623 | return ret; | |
2624 | ||
2625 | error: | |
2626 | blkdev_put(bdev, FMODE_EXCL); | |
2627 | return ret; | |
2628 | } | |
2629 | ||
2630 | void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info, | |
2631 | struct btrfs_device *tgtdev) | |
2632 | { | |
da17066c JM |
2633 | u32 sectorsize = fs_info->sectorsize; |
2634 | ||
e93c89c1 | 2635 | WARN_ON(fs_info->fs_devices->rw_devices == 0); |
da17066c JM |
2636 | tgtdev->io_width = sectorsize; |
2637 | tgtdev->io_align = sectorsize; | |
2638 | tgtdev->sector_size = sectorsize; | |
fb456252 | 2639 | tgtdev->fs_info = fs_info; |
e93c89c1 SB |
2640 | tgtdev->in_fs_metadata = 1; |
2641 | } | |
2642 | ||
d397712b CM |
2643 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
2644 | struct btrfs_device *device) | |
0b86a832 CM |
2645 | { |
2646 | int ret; | |
2647 | struct btrfs_path *path; | |
0b246afa | 2648 | struct btrfs_root *root = device->fs_info->chunk_root; |
0b86a832 CM |
2649 | struct btrfs_dev_item *dev_item; |
2650 | struct extent_buffer *leaf; | |
2651 | struct btrfs_key key; | |
2652 | ||
0b86a832 CM |
2653 | path = btrfs_alloc_path(); |
2654 | if (!path) | |
2655 | return -ENOMEM; | |
2656 | ||
2657 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
2658 | key.type = BTRFS_DEV_ITEM_KEY; | |
2659 | key.offset = device->devid; | |
2660 | ||
2661 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
2662 | if (ret < 0) | |
2663 | goto out; | |
2664 | ||
2665 | if (ret > 0) { | |
2666 | ret = -ENOENT; | |
2667 | goto out; | |
2668 | } | |
2669 | ||
2670 | leaf = path->nodes[0]; | |
2671 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
2672 | ||
2673 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2674 | btrfs_set_device_type(leaf, dev_item, device->type); | |
2675 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
2676 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
2677 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
7cc8e58d MX |
2678 | btrfs_set_device_total_bytes(leaf, dev_item, |
2679 | btrfs_device_get_disk_total_bytes(device)); | |
2680 | btrfs_set_device_bytes_used(leaf, dev_item, | |
2681 | btrfs_device_get_bytes_used(device)); | |
0b86a832 CM |
2682 | btrfs_mark_buffer_dirty(leaf); |
2683 | ||
2684 | out: | |
2685 | btrfs_free_path(path); | |
2686 | return ret; | |
2687 | } | |
2688 | ||
2196d6e8 | 2689 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
2690 | struct btrfs_device *device, u64 new_size) |
2691 | { | |
0b246afa JM |
2692 | struct btrfs_fs_info *fs_info = device->fs_info; |
2693 | struct btrfs_super_block *super_copy = fs_info->super_copy; | |
935e5cc9 | 2694 | struct btrfs_fs_devices *fs_devices; |
2196d6e8 MX |
2695 | u64 old_total; |
2696 | u64 diff; | |
8f18cf13 | 2697 | |
2b82032c YZ |
2698 | if (!device->writeable) |
2699 | return -EACCES; | |
2196d6e8 | 2700 | |
7dfb8be1 NB |
2701 | new_size = round_down(new_size, fs_info->sectorsize); |
2702 | ||
34441361 | 2703 | mutex_lock(&fs_info->chunk_mutex); |
2196d6e8 MX |
2704 | old_total = btrfs_super_total_bytes(super_copy); |
2705 | diff = new_size - device->total_bytes; | |
2706 | ||
63a212ab | 2707 | if (new_size <= device->total_bytes || |
2196d6e8 | 2708 | device->is_tgtdev_for_dev_replace) { |
34441361 | 2709 | mutex_unlock(&fs_info->chunk_mutex); |
2b82032c | 2710 | return -EINVAL; |
2196d6e8 | 2711 | } |
2b82032c | 2712 | |
0b246afa | 2713 | fs_devices = fs_info->fs_devices; |
2b82032c | 2714 | |
7dfb8be1 NB |
2715 | btrfs_set_super_total_bytes(super_copy, |
2716 | round_down(old_total + diff, fs_info->sectorsize)); | |
2b82032c YZ |
2717 | device->fs_devices->total_rw_bytes += diff; |
2718 | ||
7cc8e58d MX |
2719 | btrfs_device_set_total_bytes(device, new_size); |
2720 | btrfs_device_set_disk_total_bytes(device, new_size); | |
fb456252 | 2721 | btrfs_clear_space_info_full(device->fs_info); |
935e5cc9 MX |
2722 | if (list_empty(&device->resized_list)) |
2723 | list_add_tail(&device->resized_list, | |
2724 | &fs_devices->resized_devices); | |
34441361 | 2725 | mutex_unlock(&fs_info->chunk_mutex); |
4184ea7f | 2726 | |
8f18cf13 CM |
2727 | return btrfs_update_device(trans, device); |
2728 | } | |
2729 | ||
2730 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, | |
5b4aacef | 2731 | struct btrfs_fs_info *fs_info, u64 chunk_objectid, |
8f18cf13 CM |
2732 | u64 chunk_offset) |
2733 | { | |
5b4aacef | 2734 | struct btrfs_root *root = fs_info->chunk_root; |
8f18cf13 CM |
2735 | int ret; |
2736 | struct btrfs_path *path; | |
2737 | struct btrfs_key key; | |
2738 | ||
8f18cf13 CM |
2739 | path = btrfs_alloc_path(); |
2740 | if (!path) | |
2741 | return -ENOMEM; | |
2742 | ||
2743 | key.objectid = chunk_objectid; | |
2744 | key.offset = chunk_offset; | |
2745 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2746 | ||
2747 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
79787eaa JM |
2748 | if (ret < 0) |
2749 | goto out; | |
2750 | else if (ret > 0) { /* Logic error or corruption */ | |
0b246afa JM |
2751 | btrfs_handle_fs_error(fs_info, -ENOENT, |
2752 | "Failed lookup while freeing chunk."); | |
79787eaa JM |
2753 | ret = -ENOENT; |
2754 | goto out; | |
2755 | } | |
8f18cf13 CM |
2756 | |
2757 | ret = btrfs_del_item(trans, root, path); | |
79787eaa | 2758 | if (ret < 0) |
0b246afa JM |
2759 | btrfs_handle_fs_error(fs_info, ret, |
2760 | "Failed to delete chunk item."); | |
79787eaa | 2761 | out: |
8f18cf13 | 2762 | btrfs_free_path(path); |
65a246c5 | 2763 | return ret; |
8f18cf13 CM |
2764 | } |
2765 | ||
6bccf3ab JM |
2766 | static int btrfs_del_sys_chunk(struct btrfs_fs_info *fs_info, |
2767 | u64 chunk_objectid, u64 chunk_offset) | |
8f18cf13 | 2768 | { |
0b246afa | 2769 | struct btrfs_super_block *super_copy = fs_info->super_copy; |
8f18cf13 CM |
2770 | struct btrfs_disk_key *disk_key; |
2771 | struct btrfs_chunk *chunk; | |
2772 | u8 *ptr; | |
2773 | int ret = 0; | |
2774 | u32 num_stripes; | |
2775 | u32 array_size; | |
2776 | u32 len = 0; | |
2777 | u32 cur; | |
2778 | struct btrfs_key key; | |
2779 | ||
34441361 | 2780 | mutex_lock(&fs_info->chunk_mutex); |
8f18cf13 CM |
2781 | array_size = btrfs_super_sys_array_size(super_copy); |
2782 | ||
2783 | ptr = super_copy->sys_chunk_array; | |
2784 | cur = 0; | |
2785 | ||
2786 | while (cur < array_size) { | |
2787 | disk_key = (struct btrfs_disk_key *)ptr; | |
2788 | btrfs_disk_key_to_cpu(&key, disk_key); | |
2789 | ||
2790 | len = sizeof(*disk_key); | |
2791 | ||
2792 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
2793 | chunk = (struct btrfs_chunk *)(ptr + len); | |
2794 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
2795 | len += btrfs_chunk_item_size(num_stripes); | |
2796 | } else { | |
2797 | ret = -EIO; | |
2798 | break; | |
2799 | } | |
2800 | if (key.objectid == chunk_objectid && | |
2801 | key.offset == chunk_offset) { | |
2802 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
2803 | array_size -= len; | |
2804 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
2805 | } else { | |
2806 | ptr += len; | |
2807 | cur += len; | |
2808 | } | |
2809 | } | |
34441361 | 2810 | mutex_unlock(&fs_info->chunk_mutex); |
8f18cf13 CM |
2811 | return ret; |
2812 | } | |
2813 | ||
592d92ee LB |
2814 | static struct extent_map *get_chunk_map(struct btrfs_fs_info *fs_info, |
2815 | u64 logical, u64 length) | |
2816 | { | |
2817 | struct extent_map_tree *em_tree; | |
2818 | struct extent_map *em; | |
2819 | ||
2820 | em_tree = &fs_info->mapping_tree.map_tree; | |
2821 | read_lock(&em_tree->lock); | |
2822 | em = lookup_extent_mapping(em_tree, logical, length); | |
2823 | read_unlock(&em_tree->lock); | |
2824 | ||
2825 | if (!em) { | |
2826 | btrfs_crit(fs_info, "unable to find logical %llu length %llu", | |
2827 | logical, length); | |
2828 | return ERR_PTR(-EINVAL); | |
2829 | } | |
2830 | ||
2831 | if (em->start > logical || em->start + em->len < logical) { | |
2832 | btrfs_crit(fs_info, | |
2833 | "found a bad mapping, wanted %llu-%llu, found %llu-%llu", | |
2834 | logical, length, em->start, em->start + em->len); | |
2835 | free_extent_map(em); | |
2836 | return ERR_PTR(-EINVAL); | |
2837 | } | |
2838 | ||
2839 | /* callers are responsible for dropping em's ref. */ | |
2840 | return em; | |
2841 | } | |
2842 | ||
47ab2a6c | 2843 | int btrfs_remove_chunk(struct btrfs_trans_handle *trans, |
5b4aacef | 2844 | struct btrfs_fs_info *fs_info, u64 chunk_offset) |
8f18cf13 | 2845 | { |
8f18cf13 CM |
2846 | struct extent_map *em; |
2847 | struct map_lookup *map; | |
2196d6e8 | 2848 | u64 dev_extent_len = 0; |
47ab2a6c | 2849 | u64 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
47ab2a6c | 2850 | int i, ret = 0; |
0b246afa | 2851 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
8f18cf13 | 2852 | |
592d92ee LB |
2853 | em = get_chunk_map(fs_info, chunk_offset, 1); |
2854 | if (IS_ERR(em)) { | |
47ab2a6c JB |
2855 | /* |
2856 | * This is a logic error, but we don't want to just rely on the | |
bb7ab3b9 | 2857 | * user having built with ASSERT enabled, so if ASSERT doesn't |
47ab2a6c JB |
2858 | * do anything we still error out. |
2859 | */ | |
2860 | ASSERT(0); | |
592d92ee | 2861 | return PTR_ERR(em); |
47ab2a6c | 2862 | } |
95617d69 | 2863 | map = em->map_lookup; |
34441361 | 2864 | mutex_lock(&fs_info->chunk_mutex); |
2ff7e61e | 2865 | check_system_chunk(trans, fs_info, map->type); |
34441361 | 2866 | mutex_unlock(&fs_info->chunk_mutex); |
8f18cf13 | 2867 | |
57ba4cb8 FM |
2868 | /* |
2869 | * Take the device list mutex to prevent races with the final phase of | |
2870 | * a device replace operation that replaces the device object associated | |
2871 | * with map stripes (dev-replace.c:btrfs_dev_replace_finishing()). | |
2872 | */ | |
2873 | mutex_lock(&fs_devices->device_list_mutex); | |
8f18cf13 | 2874 | for (i = 0; i < map->num_stripes; i++) { |
47ab2a6c | 2875 | struct btrfs_device *device = map->stripes[i].dev; |
2196d6e8 MX |
2876 | ret = btrfs_free_dev_extent(trans, device, |
2877 | map->stripes[i].physical, | |
2878 | &dev_extent_len); | |
47ab2a6c | 2879 | if (ret) { |
57ba4cb8 | 2880 | mutex_unlock(&fs_devices->device_list_mutex); |
66642832 | 2881 | btrfs_abort_transaction(trans, ret); |
47ab2a6c JB |
2882 | goto out; |
2883 | } | |
a061fc8d | 2884 | |
2196d6e8 | 2885 | if (device->bytes_used > 0) { |
34441361 | 2886 | mutex_lock(&fs_info->chunk_mutex); |
2196d6e8 MX |
2887 | btrfs_device_set_bytes_used(device, |
2888 | device->bytes_used - dev_extent_len); | |
a5ed45f8 | 2889 | atomic64_add(dev_extent_len, &fs_info->free_chunk_space); |
0b246afa | 2890 | btrfs_clear_space_info_full(fs_info); |
34441361 | 2891 | mutex_unlock(&fs_info->chunk_mutex); |
2196d6e8 | 2892 | } |
a061fc8d | 2893 | |
dfe25020 CM |
2894 | if (map->stripes[i].dev) { |
2895 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
47ab2a6c | 2896 | if (ret) { |
57ba4cb8 | 2897 | mutex_unlock(&fs_devices->device_list_mutex); |
66642832 | 2898 | btrfs_abort_transaction(trans, ret); |
47ab2a6c JB |
2899 | goto out; |
2900 | } | |
dfe25020 | 2901 | } |
8f18cf13 | 2902 | } |
57ba4cb8 FM |
2903 | mutex_unlock(&fs_devices->device_list_mutex); |
2904 | ||
0b246afa | 2905 | ret = btrfs_free_chunk(trans, fs_info, chunk_objectid, chunk_offset); |
47ab2a6c | 2906 | if (ret) { |
66642832 | 2907 | btrfs_abort_transaction(trans, ret); |
47ab2a6c JB |
2908 | goto out; |
2909 | } | |
8f18cf13 | 2910 | |
6bccf3ab | 2911 | trace_btrfs_chunk_free(fs_info, map, chunk_offset, em->len); |
1abe9b8a | 2912 | |
8f18cf13 | 2913 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
6bccf3ab JM |
2914 | ret = btrfs_del_sys_chunk(fs_info, chunk_objectid, |
2915 | chunk_offset); | |
47ab2a6c | 2916 | if (ret) { |
66642832 | 2917 | btrfs_abort_transaction(trans, ret); |
47ab2a6c JB |
2918 | goto out; |
2919 | } | |
8f18cf13 CM |
2920 | } |
2921 | ||
6bccf3ab | 2922 | ret = btrfs_remove_block_group(trans, fs_info, chunk_offset, em); |
47ab2a6c | 2923 | if (ret) { |
66642832 | 2924 | btrfs_abort_transaction(trans, ret); |
47ab2a6c JB |
2925 | goto out; |
2926 | } | |
2b82032c | 2927 | |
47ab2a6c | 2928 | out: |
2b82032c YZ |
2929 | /* once for us */ |
2930 | free_extent_map(em); | |
47ab2a6c JB |
2931 | return ret; |
2932 | } | |
2b82032c | 2933 | |
5b4aacef | 2934 | static int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset) |
47ab2a6c | 2935 | { |
5b4aacef | 2936 | struct btrfs_root *root = fs_info->chunk_root; |
19c4d2f9 | 2937 | struct btrfs_trans_handle *trans; |
47ab2a6c | 2938 | int ret; |
2b82032c | 2939 | |
67c5e7d4 FM |
2940 | /* |
2941 | * Prevent races with automatic removal of unused block groups. | |
2942 | * After we relocate and before we remove the chunk with offset | |
2943 | * chunk_offset, automatic removal of the block group can kick in, | |
2944 | * resulting in a failure when calling btrfs_remove_chunk() below. | |
2945 | * | |
2946 | * Make sure to acquire this mutex before doing a tree search (dev | |
2947 | * or chunk trees) to find chunks. Otherwise the cleaner kthread might | |
2948 | * call btrfs_remove_chunk() (through btrfs_delete_unused_bgs()) after | |
2949 | * we release the path used to search the chunk/dev tree and before | |
2950 | * the current task acquires this mutex and calls us. | |
2951 | */ | |
0b246afa | 2952 | ASSERT(mutex_is_locked(&fs_info->delete_unused_bgs_mutex)); |
67c5e7d4 | 2953 | |
0b246afa | 2954 | ret = btrfs_can_relocate(fs_info, chunk_offset); |
47ab2a6c JB |
2955 | if (ret) |
2956 | return -ENOSPC; | |
2957 | ||
2958 | /* step one, relocate all the extents inside this chunk */ | |
2ff7e61e | 2959 | btrfs_scrub_pause(fs_info); |
0b246afa | 2960 | ret = btrfs_relocate_block_group(fs_info, chunk_offset); |
2ff7e61e | 2961 | btrfs_scrub_continue(fs_info); |
47ab2a6c JB |
2962 | if (ret) |
2963 | return ret; | |
2964 | ||
19c4d2f9 CM |
2965 | trans = btrfs_start_trans_remove_block_group(root->fs_info, |
2966 | chunk_offset); | |
2967 | if (IS_ERR(trans)) { | |
2968 | ret = PTR_ERR(trans); | |
2969 | btrfs_handle_fs_error(root->fs_info, ret, NULL); | |
2970 | return ret; | |
2971 | } | |
2972 | ||
47ab2a6c | 2973 | /* |
19c4d2f9 CM |
2974 | * step two, delete the device extents and the |
2975 | * chunk tree entries | |
47ab2a6c | 2976 | */ |
5b4aacef | 2977 | ret = btrfs_remove_chunk(trans, fs_info, chunk_offset); |
3a45bb20 | 2978 | btrfs_end_transaction(trans); |
19c4d2f9 | 2979 | return ret; |
2b82032c YZ |
2980 | } |
2981 | ||
2ff7e61e | 2982 | static int btrfs_relocate_sys_chunks(struct btrfs_fs_info *fs_info) |
2b82032c | 2983 | { |
0b246afa | 2984 | struct btrfs_root *chunk_root = fs_info->chunk_root; |
2b82032c YZ |
2985 | struct btrfs_path *path; |
2986 | struct extent_buffer *leaf; | |
2987 | struct btrfs_chunk *chunk; | |
2988 | struct btrfs_key key; | |
2989 | struct btrfs_key found_key; | |
2b82032c | 2990 | u64 chunk_type; |
ba1bf481 JB |
2991 | bool retried = false; |
2992 | int failed = 0; | |
2b82032c YZ |
2993 | int ret; |
2994 | ||
2995 | path = btrfs_alloc_path(); | |
2996 | if (!path) | |
2997 | return -ENOMEM; | |
2998 | ||
ba1bf481 | 2999 | again: |
2b82032c YZ |
3000 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
3001 | key.offset = (u64)-1; | |
3002 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
3003 | ||
3004 | while (1) { | |
0b246afa | 3005 | mutex_lock(&fs_info->delete_unused_bgs_mutex); |
2b82032c | 3006 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
67c5e7d4 | 3007 | if (ret < 0) { |
0b246afa | 3008 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
2b82032c | 3009 | goto error; |
67c5e7d4 | 3010 | } |
79787eaa | 3011 | BUG_ON(ret == 0); /* Corruption */ |
2b82032c YZ |
3012 | |
3013 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
3014 | key.type); | |
67c5e7d4 | 3015 | if (ret) |
0b246afa | 3016 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
2b82032c YZ |
3017 | if (ret < 0) |
3018 | goto error; | |
3019 | if (ret > 0) | |
3020 | break; | |
1a40e23b | 3021 | |
2b82032c YZ |
3022 | leaf = path->nodes[0]; |
3023 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 3024 | |
2b82032c YZ |
3025 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
3026 | struct btrfs_chunk); | |
3027 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
b3b4aa74 | 3028 | btrfs_release_path(path); |
8f18cf13 | 3029 | |
2b82032c | 3030 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
0b246afa | 3031 | ret = btrfs_relocate_chunk(fs_info, found_key.offset); |
ba1bf481 JB |
3032 | if (ret == -ENOSPC) |
3033 | failed++; | |
14586651 HS |
3034 | else |
3035 | BUG_ON(ret); | |
2b82032c | 3036 | } |
0b246afa | 3037 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
8f18cf13 | 3038 | |
2b82032c YZ |
3039 | if (found_key.offset == 0) |
3040 | break; | |
3041 | key.offset = found_key.offset - 1; | |
3042 | } | |
3043 | ret = 0; | |
ba1bf481 JB |
3044 | if (failed && !retried) { |
3045 | failed = 0; | |
3046 | retried = true; | |
3047 | goto again; | |
fae7f21c | 3048 | } else if (WARN_ON(failed && retried)) { |
ba1bf481 JB |
3049 | ret = -ENOSPC; |
3050 | } | |
2b82032c YZ |
3051 | error: |
3052 | btrfs_free_path(path); | |
3053 | return ret; | |
8f18cf13 CM |
3054 | } |
3055 | ||
6bccf3ab | 3056 | static int insert_balance_item(struct btrfs_fs_info *fs_info, |
0940ebf6 ID |
3057 | struct btrfs_balance_control *bctl) |
3058 | { | |
6bccf3ab | 3059 | struct btrfs_root *root = fs_info->tree_root; |
0940ebf6 ID |
3060 | struct btrfs_trans_handle *trans; |
3061 | struct btrfs_balance_item *item; | |
3062 | struct btrfs_disk_balance_args disk_bargs; | |
3063 | struct btrfs_path *path; | |
3064 | struct extent_buffer *leaf; | |
3065 | struct btrfs_key key; | |
3066 | int ret, err; | |
3067 | ||
3068 | path = btrfs_alloc_path(); | |
3069 | if (!path) | |
3070 | return -ENOMEM; | |
3071 | ||
3072 | trans = btrfs_start_transaction(root, 0); | |
3073 | if (IS_ERR(trans)) { | |
3074 | btrfs_free_path(path); | |
3075 | return PTR_ERR(trans); | |
3076 | } | |
3077 | ||
3078 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
c479cb4f | 3079 | key.type = BTRFS_TEMPORARY_ITEM_KEY; |
0940ebf6 ID |
3080 | key.offset = 0; |
3081 | ||
3082 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
3083 | sizeof(*item)); | |
3084 | if (ret) | |
3085 | goto out; | |
3086 | ||
3087 | leaf = path->nodes[0]; | |
3088 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
3089 | ||
b159fa28 | 3090 | memzero_extent_buffer(leaf, (unsigned long)item, sizeof(*item)); |
0940ebf6 ID |
3091 | |
3092 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data); | |
3093 | btrfs_set_balance_data(leaf, item, &disk_bargs); | |
3094 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->meta); | |
3095 | btrfs_set_balance_meta(leaf, item, &disk_bargs); | |
3096 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->sys); | |
3097 | btrfs_set_balance_sys(leaf, item, &disk_bargs); | |
3098 | ||
3099 | btrfs_set_balance_flags(leaf, item, bctl->flags); | |
3100 | ||
3101 | btrfs_mark_buffer_dirty(leaf); | |
3102 | out: | |
3103 | btrfs_free_path(path); | |
3a45bb20 | 3104 | err = btrfs_commit_transaction(trans); |
0940ebf6 ID |
3105 | if (err && !ret) |
3106 | ret = err; | |
3107 | return ret; | |
3108 | } | |
3109 | ||
6bccf3ab | 3110 | static int del_balance_item(struct btrfs_fs_info *fs_info) |
0940ebf6 | 3111 | { |
6bccf3ab | 3112 | struct btrfs_root *root = fs_info->tree_root; |
0940ebf6 ID |
3113 | struct btrfs_trans_handle *trans; |
3114 | struct btrfs_path *path; | |
3115 | struct btrfs_key key; | |
3116 | int ret, err; | |
3117 | ||
3118 | path = btrfs_alloc_path(); | |
3119 | if (!path) | |
3120 | return -ENOMEM; | |
3121 | ||
3122 | trans = btrfs_start_transaction(root, 0); | |
3123 | if (IS_ERR(trans)) { | |
3124 | btrfs_free_path(path); | |
3125 | return PTR_ERR(trans); | |
3126 | } | |
3127 | ||
3128 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
c479cb4f | 3129 | key.type = BTRFS_TEMPORARY_ITEM_KEY; |
0940ebf6 ID |
3130 | key.offset = 0; |
3131 | ||
3132 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
3133 | if (ret < 0) | |
3134 | goto out; | |
3135 | if (ret > 0) { | |
3136 | ret = -ENOENT; | |
3137 | goto out; | |
3138 | } | |
3139 | ||
3140 | ret = btrfs_del_item(trans, root, path); | |
3141 | out: | |
3142 | btrfs_free_path(path); | |
3a45bb20 | 3143 | err = btrfs_commit_transaction(trans); |
0940ebf6 ID |
3144 | if (err && !ret) |
3145 | ret = err; | |
3146 | return ret; | |
3147 | } | |
3148 | ||
59641015 ID |
3149 | /* |
3150 | * This is a heuristic used to reduce the number of chunks balanced on | |
3151 | * resume after balance was interrupted. | |
3152 | */ | |
3153 | static void update_balance_args(struct btrfs_balance_control *bctl) | |
3154 | { | |
3155 | /* | |
3156 | * Turn on soft mode for chunk types that were being converted. | |
3157 | */ | |
3158 | if (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
3159 | bctl->data.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
3160 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
3161 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
3162 | if (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
3163 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
3164 | ||
3165 | /* | |
3166 | * Turn on usage filter if is not already used. The idea is | |
3167 | * that chunks that we have already balanced should be | |
3168 | * reasonably full. Don't do it for chunks that are being | |
3169 | * converted - that will keep us from relocating unconverted | |
3170 | * (albeit full) chunks. | |
3171 | */ | |
3172 | if (!(bctl->data.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
bc309467 | 3173 | !(bctl->data.flags & BTRFS_BALANCE_ARGS_USAGE_RANGE) && |
59641015 ID |
3174 | !(bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)) { |
3175 | bctl->data.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
3176 | bctl->data.usage = 90; | |
3177 | } | |
3178 | if (!(bctl->sys.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
bc309467 | 3179 | !(bctl->sys.flags & BTRFS_BALANCE_ARGS_USAGE_RANGE) && |
59641015 ID |
3180 | !(bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)) { |
3181 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
3182 | bctl->sys.usage = 90; | |
3183 | } | |
3184 | if (!(bctl->meta.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
bc309467 | 3185 | !(bctl->meta.flags & BTRFS_BALANCE_ARGS_USAGE_RANGE) && |
59641015 ID |
3186 | !(bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)) { |
3187 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
3188 | bctl->meta.usage = 90; | |
3189 | } | |
3190 | } | |
3191 | ||
c9e9f97b ID |
3192 | /* |
3193 | * Should be called with both balance and volume mutexes held to | |
3194 | * serialize other volume operations (add_dev/rm_dev/resize) with | |
3195 | * restriper. Same goes for unset_balance_control. | |
3196 | */ | |
3197 | static void set_balance_control(struct btrfs_balance_control *bctl) | |
3198 | { | |
3199 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
3200 | ||
3201 | BUG_ON(fs_info->balance_ctl); | |
3202 | ||
3203 | spin_lock(&fs_info->balance_lock); | |
3204 | fs_info->balance_ctl = bctl; | |
3205 | spin_unlock(&fs_info->balance_lock); | |
3206 | } | |
3207 | ||
3208 | static void unset_balance_control(struct btrfs_fs_info *fs_info) | |
3209 | { | |
3210 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3211 | ||
3212 | BUG_ON(!fs_info->balance_ctl); | |
3213 | ||
3214 | spin_lock(&fs_info->balance_lock); | |
3215 | fs_info->balance_ctl = NULL; | |
3216 | spin_unlock(&fs_info->balance_lock); | |
3217 | ||
3218 | kfree(bctl); | |
3219 | } | |
3220 | ||
ed25e9b2 ID |
3221 | /* |
3222 | * Balance filters. Return 1 if chunk should be filtered out | |
3223 | * (should not be balanced). | |
3224 | */ | |
899c81ea | 3225 | static int chunk_profiles_filter(u64 chunk_type, |
ed25e9b2 ID |
3226 | struct btrfs_balance_args *bargs) |
3227 | { | |
899c81ea ID |
3228 | chunk_type = chunk_to_extended(chunk_type) & |
3229 | BTRFS_EXTENDED_PROFILE_MASK; | |
ed25e9b2 | 3230 | |
899c81ea | 3231 | if (bargs->profiles & chunk_type) |
ed25e9b2 ID |
3232 | return 0; |
3233 | ||
3234 | return 1; | |
3235 | } | |
3236 | ||
dba72cb3 | 3237 | static int chunk_usage_range_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset, |
5ce5b3c0 | 3238 | struct btrfs_balance_args *bargs) |
bc309467 DS |
3239 | { |
3240 | struct btrfs_block_group_cache *cache; | |
3241 | u64 chunk_used; | |
3242 | u64 user_thresh_min; | |
3243 | u64 user_thresh_max; | |
3244 | int ret = 1; | |
3245 | ||
3246 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
3247 | chunk_used = btrfs_block_group_used(&cache->item); | |
3248 | ||
3249 | if (bargs->usage_min == 0) | |
3250 | user_thresh_min = 0; | |
3251 | else | |
3252 | user_thresh_min = div_factor_fine(cache->key.offset, | |
3253 | bargs->usage_min); | |
3254 | ||
3255 | if (bargs->usage_max == 0) | |
3256 | user_thresh_max = 1; | |
3257 | else if (bargs->usage_max > 100) | |
3258 | user_thresh_max = cache->key.offset; | |
3259 | else | |
3260 | user_thresh_max = div_factor_fine(cache->key.offset, | |
3261 | bargs->usage_max); | |
3262 | ||
3263 | if (user_thresh_min <= chunk_used && chunk_used < user_thresh_max) | |
3264 | ret = 0; | |
3265 | ||
3266 | btrfs_put_block_group(cache); | |
3267 | return ret; | |
3268 | } | |
3269 | ||
dba72cb3 | 3270 | static int chunk_usage_filter(struct btrfs_fs_info *fs_info, |
bc309467 | 3271 | u64 chunk_offset, struct btrfs_balance_args *bargs) |
5ce5b3c0 ID |
3272 | { |
3273 | struct btrfs_block_group_cache *cache; | |
3274 | u64 chunk_used, user_thresh; | |
3275 | int ret = 1; | |
3276 | ||
3277 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
3278 | chunk_used = btrfs_block_group_used(&cache->item); | |
3279 | ||
bc309467 | 3280 | if (bargs->usage_min == 0) |
3e39cea6 | 3281 | user_thresh = 1; |
a105bb88 ID |
3282 | else if (bargs->usage > 100) |
3283 | user_thresh = cache->key.offset; | |
3284 | else | |
3285 | user_thresh = div_factor_fine(cache->key.offset, | |
3286 | bargs->usage); | |
3287 | ||
5ce5b3c0 ID |
3288 | if (chunk_used < user_thresh) |
3289 | ret = 0; | |
3290 | ||
3291 | btrfs_put_block_group(cache); | |
3292 | return ret; | |
3293 | } | |
3294 | ||
409d404b ID |
3295 | static int chunk_devid_filter(struct extent_buffer *leaf, |
3296 | struct btrfs_chunk *chunk, | |
3297 | struct btrfs_balance_args *bargs) | |
3298 | { | |
3299 | struct btrfs_stripe *stripe; | |
3300 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
3301 | int i; | |
3302 | ||
3303 | for (i = 0; i < num_stripes; i++) { | |
3304 | stripe = btrfs_stripe_nr(chunk, i); | |
3305 | if (btrfs_stripe_devid(leaf, stripe) == bargs->devid) | |
3306 | return 0; | |
3307 | } | |
3308 | ||
3309 | return 1; | |
3310 | } | |
3311 | ||
94e60d5a ID |
3312 | /* [pstart, pend) */ |
3313 | static int chunk_drange_filter(struct extent_buffer *leaf, | |
3314 | struct btrfs_chunk *chunk, | |
3315 | u64 chunk_offset, | |
3316 | struct btrfs_balance_args *bargs) | |
3317 | { | |
3318 | struct btrfs_stripe *stripe; | |
3319 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
3320 | u64 stripe_offset; | |
3321 | u64 stripe_length; | |
3322 | int factor; | |
3323 | int i; | |
3324 | ||
3325 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_DEVID)) | |
3326 | return 0; | |
3327 | ||
3328 | if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP | | |
53b381b3 DW |
3329 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)) { |
3330 | factor = num_stripes / 2; | |
3331 | } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID5) { | |
3332 | factor = num_stripes - 1; | |
3333 | } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID6) { | |
3334 | factor = num_stripes - 2; | |
3335 | } else { | |
3336 | factor = num_stripes; | |
3337 | } | |
94e60d5a ID |
3338 | |
3339 | for (i = 0; i < num_stripes; i++) { | |
3340 | stripe = btrfs_stripe_nr(chunk, i); | |
3341 | if (btrfs_stripe_devid(leaf, stripe) != bargs->devid) | |
3342 | continue; | |
3343 | ||
3344 | stripe_offset = btrfs_stripe_offset(leaf, stripe); | |
3345 | stripe_length = btrfs_chunk_length(leaf, chunk); | |
b8b93add | 3346 | stripe_length = div_u64(stripe_length, factor); |
94e60d5a ID |
3347 | |
3348 | if (stripe_offset < bargs->pend && | |
3349 | stripe_offset + stripe_length > bargs->pstart) | |
3350 | return 0; | |
3351 | } | |
3352 | ||
3353 | return 1; | |
3354 | } | |
3355 | ||
ea67176a ID |
3356 | /* [vstart, vend) */ |
3357 | static int chunk_vrange_filter(struct extent_buffer *leaf, | |
3358 | struct btrfs_chunk *chunk, | |
3359 | u64 chunk_offset, | |
3360 | struct btrfs_balance_args *bargs) | |
3361 | { | |
3362 | if (chunk_offset < bargs->vend && | |
3363 | chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart) | |
3364 | /* at least part of the chunk is inside this vrange */ | |
3365 | return 0; | |
3366 | ||
3367 | return 1; | |
3368 | } | |
3369 | ||
dee32d0a GAP |
3370 | static int chunk_stripes_range_filter(struct extent_buffer *leaf, |
3371 | struct btrfs_chunk *chunk, | |
3372 | struct btrfs_balance_args *bargs) | |
3373 | { | |
3374 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
3375 | ||
3376 | if (bargs->stripes_min <= num_stripes | |
3377 | && num_stripes <= bargs->stripes_max) | |
3378 | return 0; | |
3379 | ||
3380 | return 1; | |
3381 | } | |
3382 | ||
899c81ea | 3383 | static int chunk_soft_convert_filter(u64 chunk_type, |
cfa4c961 ID |
3384 | struct btrfs_balance_args *bargs) |
3385 | { | |
3386 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT)) | |
3387 | return 0; | |
3388 | ||
899c81ea ID |
3389 | chunk_type = chunk_to_extended(chunk_type) & |
3390 | BTRFS_EXTENDED_PROFILE_MASK; | |
cfa4c961 | 3391 | |
899c81ea | 3392 | if (bargs->target == chunk_type) |
cfa4c961 ID |
3393 | return 1; |
3394 | ||
3395 | return 0; | |
3396 | } | |
3397 | ||
2ff7e61e | 3398 | static int should_balance_chunk(struct btrfs_fs_info *fs_info, |
f43ffb60 ID |
3399 | struct extent_buffer *leaf, |
3400 | struct btrfs_chunk *chunk, u64 chunk_offset) | |
3401 | { | |
0b246afa | 3402 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
f43ffb60 ID |
3403 | struct btrfs_balance_args *bargs = NULL; |
3404 | u64 chunk_type = btrfs_chunk_type(leaf, chunk); | |
3405 | ||
3406 | /* type filter */ | |
3407 | if (!((chunk_type & BTRFS_BLOCK_GROUP_TYPE_MASK) & | |
3408 | (bctl->flags & BTRFS_BALANCE_TYPE_MASK))) { | |
3409 | return 0; | |
3410 | } | |
3411 | ||
3412 | if (chunk_type & BTRFS_BLOCK_GROUP_DATA) | |
3413 | bargs = &bctl->data; | |
3414 | else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) | |
3415 | bargs = &bctl->sys; | |
3416 | else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA) | |
3417 | bargs = &bctl->meta; | |
3418 | ||
ed25e9b2 ID |
3419 | /* profiles filter */ |
3420 | if ((bargs->flags & BTRFS_BALANCE_ARGS_PROFILES) && | |
3421 | chunk_profiles_filter(chunk_type, bargs)) { | |
3422 | return 0; | |
5ce5b3c0 ID |
3423 | } |
3424 | ||
3425 | /* usage filter */ | |
3426 | if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) && | |
0b246afa | 3427 | chunk_usage_filter(fs_info, chunk_offset, bargs)) { |
5ce5b3c0 | 3428 | return 0; |
bc309467 | 3429 | } else if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE_RANGE) && |
0b246afa | 3430 | chunk_usage_range_filter(fs_info, chunk_offset, bargs)) { |
bc309467 | 3431 | return 0; |
409d404b ID |
3432 | } |
3433 | ||
3434 | /* devid filter */ | |
3435 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DEVID) && | |
3436 | chunk_devid_filter(leaf, chunk, bargs)) { | |
3437 | return 0; | |
94e60d5a ID |
3438 | } |
3439 | ||
3440 | /* drange filter, makes sense only with devid filter */ | |
3441 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) && | |
3442 | chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) { | |
3443 | return 0; | |
ea67176a ID |
3444 | } |
3445 | ||
3446 | /* vrange filter */ | |
3447 | if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) && | |
3448 | chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) { | |
3449 | return 0; | |
ed25e9b2 ID |
3450 | } |
3451 | ||
dee32d0a GAP |
3452 | /* stripes filter */ |
3453 | if ((bargs->flags & BTRFS_BALANCE_ARGS_STRIPES_RANGE) && | |
3454 | chunk_stripes_range_filter(leaf, chunk, bargs)) { | |
3455 | return 0; | |
3456 | } | |
3457 | ||
cfa4c961 ID |
3458 | /* soft profile changing mode */ |
3459 | if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) && | |
3460 | chunk_soft_convert_filter(chunk_type, bargs)) { | |
3461 | return 0; | |
3462 | } | |
3463 | ||
7d824b6f DS |
3464 | /* |
3465 | * limited by count, must be the last filter | |
3466 | */ | |
3467 | if ((bargs->flags & BTRFS_BALANCE_ARGS_LIMIT)) { | |
3468 | if (bargs->limit == 0) | |
3469 | return 0; | |
3470 | else | |
3471 | bargs->limit--; | |
12907fc7 DS |
3472 | } else if ((bargs->flags & BTRFS_BALANCE_ARGS_LIMIT_RANGE)) { |
3473 | /* | |
3474 | * Same logic as the 'limit' filter; the minimum cannot be | |
01327610 | 3475 | * determined here because we do not have the global information |
12907fc7 DS |
3476 | * about the count of all chunks that satisfy the filters. |
3477 | */ | |
3478 | if (bargs->limit_max == 0) | |
3479 | return 0; | |
3480 | else | |
3481 | bargs->limit_max--; | |
7d824b6f DS |
3482 | } |
3483 | ||
f43ffb60 ID |
3484 | return 1; |
3485 | } | |
3486 | ||
c9e9f97b | 3487 | static int __btrfs_balance(struct btrfs_fs_info *fs_info) |
ec44a35c | 3488 | { |
19a39dce | 3489 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
c9e9f97b ID |
3490 | struct btrfs_root *chunk_root = fs_info->chunk_root; |
3491 | struct btrfs_root *dev_root = fs_info->dev_root; | |
3492 | struct list_head *devices; | |
ec44a35c CM |
3493 | struct btrfs_device *device; |
3494 | u64 old_size; | |
3495 | u64 size_to_free; | |
12907fc7 | 3496 | u64 chunk_type; |
f43ffb60 | 3497 | struct btrfs_chunk *chunk; |
5a488b9d | 3498 | struct btrfs_path *path = NULL; |
ec44a35c | 3499 | struct btrfs_key key; |
ec44a35c | 3500 | struct btrfs_key found_key; |
c9e9f97b | 3501 | struct btrfs_trans_handle *trans; |
f43ffb60 ID |
3502 | struct extent_buffer *leaf; |
3503 | int slot; | |
c9e9f97b ID |
3504 | int ret; |
3505 | int enospc_errors = 0; | |
19a39dce | 3506 | bool counting = true; |
12907fc7 | 3507 | /* The single value limit and min/max limits use the same bytes in the */ |
7d824b6f DS |
3508 | u64 limit_data = bctl->data.limit; |
3509 | u64 limit_meta = bctl->meta.limit; | |
3510 | u64 limit_sys = bctl->sys.limit; | |
12907fc7 DS |
3511 | u32 count_data = 0; |
3512 | u32 count_meta = 0; | |
3513 | u32 count_sys = 0; | |
2c9fe835 | 3514 | int chunk_reserved = 0; |
cf25ce51 | 3515 | u64 bytes_used = 0; |
ec44a35c | 3516 | |
ec44a35c | 3517 | /* step one make some room on all the devices */ |
c9e9f97b | 3518 | devices = &fs_info->fs_devices->devices; |
c6e30871 | 3519 | list_for_each_entry(device, devices, dev_list) { |
7cc8e58d | 3520 | old_size = btrfs_device_get_total_bytes(device); |
ec44a35c | 3521 | size_to_free = div_factor(old_size, 1); |
ee22184b | 3522 | size_to_free = min_t(u64, size_to_free, SZ_1M); |
2b82032c | 3523 | if (!device->writeable || |
7cc8e58d MX |
3524 | btrfs_device_get_total_bytes(device) - |
3525 | btrfs_device_get_bytes_used(device) > size_to_free || | |
63a212ab | 3526 | device->is_tgtdev_for_dev_replace) |
ec44a35c CM |
3527 | continue; |
3528 | ||
3529 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
ba1bf481 JB |
3530 | if (ret == -ENOSPC) |
3531 | break; | |
5a488b9d LB |
3532 | if (ret) { |
3533 | /* btrfs_shrink_device never returns ret > 0 */ | |
3534 | WARN_ON(ret > 0); | |
3535 | goto error; | |
3536 | } | |
ec44a35c | 3537 | |
a22285a6 | 3538 | trans = btrfs_start_transaction(dev_root, 0); |
5a488b9d LB |
3539 | if (IS_ERR(trans)) { |
3540 | ret = PTR_ERR(trans); | |
3541 | btrfs_info_in_rcu(fs_info, | |
3542 | "resize: unable to start transaction after shrinking device %s (error %d), old size %llu, new size %llu", | |
3543 | rcu_str_deref(device->name), ret, | |
3544 | old_size, old_size - size_to_free); | |
3545 | goto error; | |
3546 | } | |
ec44a35c CM |
3547 | |
3548 | ret = btrfs_grow_device(trans, device, old_size); | |
5a488b9d | 3549 | if (ret) { |
3a45bb20 | 3550 | btrfs_end_transaction(trans); |
5a488b9d LB |
3551 | /* btrfs_grow_device never returns ret > 0 */ |
3552 | WARN_ON(ret > 0); | |
3553 | btrfs_info_in_rcu(fs_info, | |
3554 | "resize: unable to grow device after shrinking device %s (error %d), old size %llu, new size %llu", | |
3555 | rcu_str_deref(device->name), ret, | |
3556 | old_size, old_size - size_to_free); | |
3557 | goto error; | |
3558 | } | |
ec44a35c | 3559 | |
3a45bb20 | 3560 | btrfs_end_transaction(trans); |
ec44a35c CM |
3561 | } |
3562 | ||
3563 | /* step two, relocate all the chunks */ | |
3564 | path = btrfs_alloc_path(); | |
17e9f796 MF |
3565 | if (!path) { |
3566 | ret = -ENOMEM; | |
3567 | goto error; | |
3568 | } | |
19a39dce ID |
3569 | |
3570 | /* zero out stat counters */ | |
3571 | spin_lock(&fs_info->balance_lock); | |
3572 | memset(&bctl->stat, 0, sizeof(bctl->stat)); | |
3573 | spin_unlock(&fs_info->balance_lock); | |
3574 | again: | |
7d824b6f | 3575 | if (!counting) { |
12907fc7 DS |
3576 | /* |
3577 | * The single value limit and min/max limits use the same bytes | |
3578 | * in the | |
3579 | */ | |
7d824b6f DS |
3580 | bctl->data.limit = limit_data; |
3581 | bctl->meta.limit = limit_meta; | |
3582 | bctl->sys.limit = limit_sys; | |
3583 | } | |
ec44a35c CM |
3584 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
3585 | key.offset = (u64)-1; | |
3586 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
3587 | ||
d397712b | 3588 | while (1) { |
19a39dce | 3589 | if ((!counting && atomic_read(&fs_info->balance_pause_req)) || |
a7e99c69 | 3590 | atomic_read(&fs_info->balance_cancel_req)) { |
837d5b6e ID |
3591 | ret = -ECANCELED; |
3592 | goto error; | |
3593 | } | |
3594 | ||
67c5e7d4 | 3595 | mutex_lock(&fs_info->delete_unused_bgs_mutex); |
ec44a35c | 3596 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
67c5e7d4 FM |
3597 | if (ret < 0) { |
3598 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
ec44a35c | 3599 | goto error; |
67c5e7d4 | 3600 | } |
ec44a35c CM |
3601 | |
3602 | /* | |
3603 | * this shouldn't happen, it means the last relocate | |
3604 | * failed | |
3605 | */ | |
3606 | if (ret == 0) | |
c9e9f97b | 3607 | BUG(); /* FIXME break ? */ |
ec44a35c CM |
3608 | |
3609 | ret = btrfs_previous_item(chunk_root, path, 0, | |
3610 | BTRFS_CHUNK_ITEM_KEY); | |
c9e9f97b | 3611 | if (ret) { |
67c5e7d4 | 3612 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
c9e9f97b | 3613 | ret = 0; |
ec44a35c | 3614 | break; |
c9e9f97b | 3615 | } |
7d9eb12c | 3616 | |
f43ffb60 ID |
3617 | leaf = path->nodes[0]; |
3618 | slot = path->slots[0]; | |
3619 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
7d9eb12c | 3620 | |
67c5e7d4 FM |
3621 | if (found_key.objectid != key.objectid) { |
3622 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
ec44a35c | 3623 | break; |
67c5e7d4 | 3624 | } |
7d9eb12c | 3625 | |
f43ffb60 | 3626 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); |
12907fc7 | 3627 | chunk_type = btrfs_chunk_type(leaf, chunk); |
f43ffb60 | 3628 | |
19a39dce ID |
3629 | if (!counting) { |
3630 | spin_lock(&fs_info->balance_lock); | |
3631 | bctl->stat.considered++; | |
3632 | spin_unlock(&fs_info->balance_lock); | |
3633 | } | |
3634 | ||
2ff7e61e | 3635 | ret = should_balance_chunk(fs_info, leaf, chunk, |
f43ffb60 | 3636 | found_key.offset); |
2c9fe835 | 3637 | |
b3b4aa74 | 3638 | btrfs_release_path(path); |
67c5e7d4 FM |
3639 | if (!ret) { |
3640 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
f43ffb60 | 3641 | goto loop; |
67c5e7d4 | 3642 | } |
f43ffb60 | 3643 | |
19a39dce | 3644 | if (counting) { |
67c5e7d4 | 3645 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
19a39dce ID |
3646 | spin_lock(&fs_info->balance_lock); |
3647 | bctl->stat.expected++; | |
3648 | spin_unlock(&fs_info->balance_lock); | |
12907fc7 DS |
3649 | |
3650 | if (chunk_type & BTRFS_BLOCK_GROUP_DATA) | |
3651 | count_data++; | |
3652 | else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) | |
3653 | count_sys++; | |
3654 | else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA) | |
3655 | count_meta++; | |
3656 | ||
3657 | goto loop; | |
3658 | } | |
3659 | ||
3660 | /* | |
3661 | * Apply limit_min filter, no need to check if the LIMITS | |
3662 | * filter is used, limit_min is 0 by default | |
3663 | */ | |
3664 | if (((chunk_type & BTRFS_BLOCK_GROUP_DATA) && | |
3665 | count_data < bctl->data.limit_min) | |
3666 | || ((chunk_type & BTRFS_BLOCK_GROUP_METADATA) && | |
3667 | count_meta < bctl->meta.limit_min) | |
3668 | || ((chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) && | |
3669 | count_sys < bctl->sys.limit_min)) { | |
3670 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
19a39dce ID |
3671 | goto loop; |
3672 | } | |
3673 | ||
cf25ce51 LB |
3674 | ASSERT(fs_info->data_sinfo); |
3675 | spin_lock(&fs_info->data_sinfo->lock); | |
3676 | bytes_used = fs_info->data_sinfo->bytes_used; | |
3677 | spin_unlock(&fs_info->data_sinfo->lock); | |
3678 | ||
3679 | if ((chunk_type & BTRFS_BLOCK_GROUP_DATA) && | |
3680 | !chunk_reserved && !bytes_used) { | |
2c9fe835 ZL |
3681 | trans = btrfs_start_transaction(chunk_root, 0); |
3682 | if (IS_ERR(trans)) { | |
3683 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
3684 | ret = PTR_ERR(trans); | |
3685 | goto error; | |
3686 | } | |
3687 | ||
2ff7e61e | 3688 | ret = btrfs_force_chunk_alloc(trans, fs_info, |
2c9fe835 | 3689 | BTRFS_BLOCK_GROUP_DATA); |
3a45bb20 | 3690 | btrfs_end_transaction(trans); |
2c9fe835 ZL |
3691 | if (ret < 0) { |
3692 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
3693 | goto error; | |
3694 | } | |
2c9fe835 ZL |
3695 | chunk_reserved = 1; |
3696 | } | |
3697 | ||
5b4aacef | 3698 | ret = btrfs_relocate_chunk(fs_info, found_key.offset); |
67c5e7d4 | 3699 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
508794eb JB |
3700 | if (ret && ret != -ENOSPC) |
3701 | goto error; | |
19a39dce | 3702 | if (ret == -ENOSPC) { |
c9e9f97b | 3703 | enospc_errors++; |
19a39dce ID |
3704 | } else { |
3705 | spin_lock(&fs_info->balance_lock); | |
3706 | bctl->stat.completed++; | |
3707 | spin_unlock(&fs_info->balance_lock); | |
3708 | } | |
f43ffb60 | 3709 | loop: |
795a3321 ID |
3710 | if (found_key.offset == 0) |
3711 | break; | |
ba1bf481 | 3712 | key.offset = found_key.offset - 1; |
ec44a35c | 3713 | } |
c9e9f97b | 3714 | |
19a39dce ID |
3715 | if (counting) { |
3716 | btrfs_release_path(path); | |
3717 | counting = false; | |
3718 | goto again; | |
3719 | } | |
ec44a35c CM |
3720 | error: |
3721 | btrfs_free_path(path); | |
c9e9f97b | 3722 | if (enospc_errors) { |
efe120a0 | 3723 | btrfs_info(fs_info, "%d enospc errors during balance", |
5d163e0e | 3724 | enospc_errors); |
c9e9f97b ID |
3725 | if (!ret) |
3726 | ret = -ENOSPC; | |
3727 | } | |
3728 | ||
ec44a35c CM |
3729 | return ret; |
3730 | } | |
3731 | ||
0c460c0d ID |
3732 | /** |
3733 | * alloc_profile_is_valid - see if a given profile is valid and reduced | |
3734 | * @flags: profile to validate | |
3735 | * @extended: if true @flags is treated as an extended profile | |
3736 | */ | |
3737 | static int alloc_profile_is_valid(u64 flags, int extended) | |
3738 | { | |
3739 | u64 mask = (extended ? BTRFS_EXTENDED_PROFILE_MASK : | |
3740 | BTRFS_BLOCK_GROUP_PROFILE_MASK); | |
3741 | ||
3742 | flags &= ~BTRFS_BLOCK_GROUP_TYPE_MASK; | |
3743 | ||
3744 | /* 1) check that all other bits are zeroed */ | |
3745 | if (flags & ~mask) | |
3746 | return 0; | |
3747 | ||
3748 | /* 2) see if profile is reduced */ | |
3749 | if (flags == 0) | |
3750 | return !extended; /* "0" is valid for usual profiles */ | |
3751 | ||
3752 | /* true if exactly one bit set */ | |
3753 | return (flags & (flags - 1)) == 0; | |
3754 | } | |
3755 | ||
837d5b6e ID |
3756 | static inline int balance_need_close(struct btrfs_fs_info *fs_info) |
3757 | { | |
a7e99c69 ID |
3758 | /* cancel requested || normal exit path */ |
3759 | return atomic_read(&fs_info->balance_cancel_req) || | |
3760 | (atomic_read(&fs_info->balance_pause_req) == 0 && | |
3761 | atomic_read(&fs_info->balance_cancel_req) == 0); | |
837d5b6e ID |
3762 | } |
3763 | ||
c9e9f97b ID |
3764 | static void __cancel_balance(struct btrfs_fs_info *fs_info) |
3765 | { | |
0940ebf6 ID |
3766 | int ret; |
3767 | ||
c9e9f97b | 3768 | unset_balance_control(fs_info); |
6bccf3ab | 3769 | ret = del_balance_item(fs_info); |
0f788c58 | 3770 | if (ret) |
34d97007 | 3771 | btrfs_handle_fs_error(fs_info, ret, NULL); |
ed0fb78f | 3772 | |
171938e5 | 3773 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
c9e9f97b ID |
3774 | } |
3775 | ||
bdcd3c97 AM |
3776 | /* Non-zero return value signifies invalidity */ |
3777 | static inline int validate_convert_profile(struct btrfs_balance_args *bctl_arg, | |
3778 | u64 allowed) | |
3779 | { | |
3780 | return ((bctl_arg->flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3781 | (!alloc_profile_is_valid(bctl_arg->target, 1) || | |
3782 | (bctl_arg->target & ~allowed))); | |
3783 | } | |
3784 | ||
c9e9f97b ID |
3785 | /* |
3786 | * Should be called with both balance and volume mutexes held | |
3787 | */ | |
3788 | int btrfs_balance(struct btrfs_balance_control *bctl, | |
3789 | struct btrfs_ioctl_balance_args *bargs) | |
3790 | { | |
3791 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
14506127 | 3792 | u64 meta_target, data_target; |
f43ffb60 | 3793 | u64 allowed; |
e4837f8f | 3794 | int mixed = 0; |
c9e9f97b | 3795 | int ret; |
8dabb742 | 3796 | u64 num_devices; |
de98ced9 | 3797 | unsigned seq; |
c9e9f97b | 3798 | |
837d5b6e | 3799 | if (btrfs_fs_closing(fs_info) || |
a7e99c69 ID |
3800 | atomic_read(&fs_info->balance_pause_req) || |
3801 | atomic_read(&fs_info->balance_cancel_req)) { | |
c9e9f97b ID |
3802 | ret = -EINVAL; |
3803 | goto out; | |
3804 | } | |
3805 | ||
e4837f8f ID |
3806 | allowed = btrfs_super_incompat_flags(fs_info->super_copy); |
3807 | if (allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
3808 | mixed = 1; | |
3809 | ||
f43ffb60 ID |
3810 | /* |
3811 | * In case of mixed groups both data and meta should be picked, | |
3812 | * and identical options should be given for both of them. | |
3813 | */ | |
e4837f8f ID |
3814 | allowed = BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA; |
3815 | if (mixed && (bctl->flags & allowed)) { | |
f43ffb60 ID |
3816 | if (!(bctl->flags & BTRFS_BALANCE_DATA) || |
3817 | !(bctl->flags & BTRFS_BALANCE_METADATA) || | |
3818 | memcmp(&bctl->data, &bctl->meta, sizeof(bctl->data))) { | |
5d163e0e JM |
3819 | btrfs_err(fs_info, |
3820 | "with mixed groups data and metadata balance options must be the same"); | |
f43ffb60 ID |
3821 | ret = -EINVAL; |
3822 | goto out; | |
3823 | } | |
3824 | } | |
3825 | ||
8dabb742 | 3826 | num_devices = fs_info->fs_devices->num_devices; |
73beece9 | 3827 | btrfs_dev_replace_lock(&fs_info->dev_replace, 0); |
8dabb742 SB |
3828 | if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) { |
3829 | BUG_ON(num_devices < 1); | |
3830 | num_devices--; | |
3831 | } | |
73beece9 | 3832 | btrfs_dev_replace_unlock(&fs_info->dev_replace, 0); |
88be159c AH |
3833 | allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE | BTRFS_BLOCK_GROUP_DUP; |
3834 | if (num_devices > 1) | |
e4d8ec0f | 3835 | allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1); |
8250dabe AP |
3836 | if (num_devices > 2) |
3837 | allowed |= BTRFS_BLOCK_GROUP_RAID5; | |
3838 | if (num_devices > 3) | |
3839 | allowed |= (BTRFS_BLOCK_GROUP_RAID10 | | |
3840 | BTRFS_BLOCK_GROUP_RAID6); | |
bdcd3c97 | 3841 | if (validate_convert_profile(&bctl->data, allowed)) { |
5d163e0e JM |
3842 | btrfs_err(fs_info, |
3843 | "unable to start balance with target data profile %llu", | |
3844 | bctl->data.target); | |
e4d8ec0f ID |
3845 | ret = -EINVAL; |
3846 | goto out; | |
3847 | } | |
bdcd3c97 | 3848 | if (validate_convert_profile(&bctl->meta, allowed)) { |
efe120a0 | 3849 | btrfs_err(fs_info, |
5d163e0e JM |
3850 | "unable to start balance with target metadata profile %llu", |
3851 | bctl->meta.target); | |
e4d8ec0f ID |
3852 | ret = -EINVAL; |
3853 | goto out; | |
3854 | } | |
bdcd3c97 | 3855 | if (validate_convert_profile(&bctl->sys, allowed)) { |
efe120a0 | 3856 | btrfs_err(fs_info, |
5d163e0e JM |
3857 | "unable to start balance with target system profile %llu", |
3858 | bctl->sys.target); | |
e4d8ec0f ID |
3859 | ret = -EINVAL; |
3860 | goto out; | |
3861 | } | |
3862 | ||
e4d8ec0f ID |
3863 | /* allow to reduce meta or sys integrity only if force set */ |
3864 | allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
3865 | BTRFS_BLOCK_GROUP_RAID10 | |
3866 | BTRFS_BLOCK_GROUP_RAID5 | | |
3867 | BTRFS_BLOCK_GROUP_RAID6; | |
de98ced9 MX |
3868 | do { |
3869 | seq = read_seqbegin(&fs_info->profiles_lock); | |
3870 | ||
3871 | if (((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3872 | (fs_info->avail_system_alloc_bits & allowed) && | |
3873 | !(bctl->sys.target & allowed)) || | |
3874 | ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3875 | (fs_info->avail_metadata_alloc_bits & allowed) && | |
3876 | !(bctl->meta.target & allowed))) { | |
3877 | if (bctl->flags & BTRFS_BALANCE_FORCE) { | |
5d163e0e JM |
3878 | btrfs_info(fs_info, |
3879 | "force reducing metadata integrity"); | |
de98ced9 | 3880 | } else { |
5d163e0e JM |
3881 | btrfs_err(fs_info, |
3882 | "balance will reduce metadata integrity, use force if you want this"); | |
de98ced9 MX |
3883 | ret = -EINVAL; |
3884 | goto out; | |
3885 | } | |
e4d8ec0f | 3886 | } |
de98ced9 | 3887 | } while (read_seqretry(&fs_info->profiles_lock, seq)); |
e4d8ec0f | 3888 | |
14506127 AB |
3889 | /* if we're not converting, the target field is uninitialized */ |
3890 | meta_target = (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) ? | |
3891 | bctl->meta.target : fs_info->avail_metadata_alloc_bits; | |
3892 | data_target = (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) ? | |
3893 | bctl->data.target : fs_info->avail_data_alloc_bits; | |
3894 | if (btrfs_get_num_tolerated_disk_barrier_failures(meta_target) < | |
3895 | btrfs_get_num_tolerated_disk_barrier_failures(data_target)) { | |
ee592d07 | 3896 | btrfs_warn(fs_info, |
5d163e0e | 3897 | "metadata profile 0x%llx has lower redundancy than data profile 0x%llx", |
14506127 | 3898 | meta_target, data_target); |
ee592d07 ST |
3899 | } |
3900 | ||
5af3e8cc | 3901 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
943c6e99 ZL |
3902 | fs_info->num_tolerated_disk_barrier_failures = min( |
3903 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info), | |
3904 | btrfs_get_num_tolerated_disk_barrier_failures( | |
3905 | bctl->sys.target)); | |
5af3e8cc SB |
3906 | } |
3907 | ||
6bccf3ab | 3908 | ret = insert_balance_item(fs_info, bctl); |
59641015 | 3909 | if (ret && ret != -EEXIST) |
0940ebf6 ID |
3910 | goto out; |
3911 | ||
59641015 ID |
3912 | if (!(bctl->flags & BTRFS_BALANCE_RESUME)) { |
3913 | BUG_ON(ret == -EEXIST); | |
3914 | set_balance_control(bctl); | |
3915 | } else { | |
3916 | BUG_ON(ret != -EEXIST); | |
3917 | spin_lock(&fs_info->balance_lock); | |
3918 | update_balance_args(bctl); | |
3919 | spin_unlock(&fs_info->balance_lock); | |
3920 | } | |
c9e9f97b | 3921 | |
837d5b6e | 3922 | atomic_inc(&fs_info->balance_running); |
c9e9f97b ID |
3923 | mutex_unlock(&fs_info->balance_mutex); |
3924 | ||
3925 | ret = __btrfs_balance(fs_info); | |
3926 | ||
3927 | mutex_lock(&fs_info->balance_mutex); | |
837d5b6e | 3928 | atomic_dec(&fs_info->balance_running); |
c9e9f97b | 3929 | |
bf023ecf ID |
3930 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
3931 | fs_info->num_tolerated_disk_barrier_failures = | |
3932 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); | |
3933 | } | |
3934 | ||
c9e9f97b ID |
3935 | if (bargs) { |
3936 | memset(bargs, 0, sizeof(*bargs)); | |
19a39dce | 3937 | update_ioctl_balance_args(fs_info, 0, bargs); |
c9e9f97b ID |
3938 | } |
3939 | ||
3a01aa7a ID |
3940 | if ((ret && ret != -ECANCELED && ret != -ENOSPC) || |
3941 | balance_need_close(fs_info)) { | |
3942 | __cancel_balance(fs_info); | |
3943 | } | |
3944 | ||
837d5b6e | 3945 | wake_up(&fs_info->balance_wait_q); |
c9e9f97b ID |
3946 | |
3947 | return ret; | |
3948 | out: | |
59641015 ID |
3949 | if (bctl->flags & BTRFS_BALANCE_RESUME) |
3950 | __cancel_balance(fs_info); | |
ed0fb78f | 3951 | else { |
59641015 | 3952 | kfree(bctl); |
171938e5 | 3953 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
ed0fb78f | 3954 | } |
59641015 ID |
3955 | return ret; |
3956 | } | |
3957 | ||
3958 | static int balance_kthread(void *data) | |
3959 | { | |
2b6ba629 | 3960 | struct btrfs_fs_info *fs_info = data; |
9555c6c1 | 3961 | int ret = 0; |
59641015 ID |
3962 | |
3963 | mutex_lock(&fs_info->volume_mutex); | |
3964 | mutex_lock(&fs_info->balance_mutex); | |
3965 | ||
2b6ba629 | 3966 | if (fs_info->balance_ctl) { |
efe120a0 | 3967 | btrfs_info(fs_info, "continuing balance"); |
2b6ba629 | 3968 | ret = btrfs_balance(fs_info->balance_ctl, NULL); |
9555c6c1 | 3969 | } |
59641015 ID |
3970 | |
3971 | mutex_unlock(&fs_info->balance_mutex); | |
3972 | mutex_unlock(&fs_info->volume_mutex); | |
2b6ba629 | 3973 | |
59641015 ID |
3974 | return ret; |
3975 | } | |
3976 | ||
2b6ba629 ID |
3977 | int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info) |
3978 | { | |
3979 | struct task_struct *tsk; | |
3980 | ||
3981 | spin_lock(&fs_info->balance_lock); | |
3982 | if (!fs_info->balance_ctl) { | |
3983 | spin_unlock(&fs_info->balance_lock); | |
3984 | return 0; | |
3985 | } | |
3986 | spin_unlock(&fs_info->balance_lock); | |
3987 | ||
3cdde224 | 3988 | if (btrfs_test_opt(fs_info, SKIP_BALANCE)) { |
efe120a0 | 3989 | btrfs_info(fs_info, "force skipping balance"); |
2b6ba629 ID |
3990 | return 0; |
3991 | } | |
3992 | ||
3993 | tsk = kthread_run(balance_kthread, fs_info, "btrfs-balance"); | |
cd633972 | 3994 | return PTR_ERR_OR_ZERO(tsk); |
2b6ba629 ID |
3995 | } |
3996 | ||
68310a5e | 3997 | int btrfs_recover_balance(struct btrfs_fs_info *fs_info) |
59641015 | 3998 | { |
59641015 ID |
3999 | struct btrfs_balance_control *bctl; |
4000 | struct btrfs_balance_item *item; | |
4001 | struct btrfs_disk_balance_args disk_bargs; | |
4002 | struct btrfs_path *path; | |
4003 | struct extent_buffer *leaf; | |
4004 | struct btrfs_key key; | |
4005 | int ret; | |
4006 | ||
4007 | path = btrfs_alloc_path(); | |
4008 | if (!path) | |
4009 | return -ENOMEM; | |
4010 | ||
59641015 | 4011 | key.objectid = BTRFS_BALANCE_OBJECTID; |
c479cb4f | 4012 | key.type = BTRFS_TEMPORARY_ITEM_KEY; |
59641015 ID |
4013 | key.offset = 0; |
4014 | ||
68310a5e | 4015 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
59641015 | 4016 | if (ret < 0) |
68310a5e | 4017 | goto out; |
59641015 ID |
4018 | if (ret > 0) { /* ret = -ENOENT; */ |
4019 | ret = 0; | |
68310a5e ID |
4020 | goto out; |
4021 | } | |
4022 | ||
4023 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); | |
4024 | if (!bctl) { | |
4025 | ret = -ENOMEM; | |
4026 | goto out; | |
59641015 ID |
4027 | } |
4028 | ||
4029 | leaf = path->nodes[0]; | |
4030 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
4031 | ||
68310a5e ID |
4032 | bctl->fs_info = fs_info; |
4033 | bctl->flags = btrfs_balance_flags(leaf, item); | |
4034 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
59641015 ID |
4035 | |
4036 | btrfs_balance_data(leaf, item, &disk_bargs); | |
4037 | btrfs_disk_balance_args_to_cpu(&bctl->data, &disk_bargs); | |
4038 | btrfs_balance_meta(leaf, item, &disk_bargs); | |
4039 | btrfs_disk_balance_args_to_cpu(&bctl->meta, &disk_bargs); | |
4040 | btrfs_balance_sys(leaf, item, &disk_bargs); | |
4041 | btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs); | |
4042 | ||
171938e5 | 4043 | WARN_ON(test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); |
ed0fb78f | 4044 | |
68310a5e ID |
4045 | mutex_lock(&fs_info->volume_mutex); |
4046 | mutex_lock(&fs_info->balance_mutex); | |
59641015 | 4047 | |
68310a5e ID |
4048 | set_balance_control(bctl); |
4049 | ||
4050 | mutex_unlock(&fs_info->balance_mutex); | |
4051 | mutex_unlock(&fs_info->volume_mutex); | |
59641015 ID |
4052 | out: |
4053 | btrfs_free_path(path); | |
ec44a35c CM |
4054 | return ret; |
4055 | } | |
4056 | ||
837d5b6e ID |
4057 | int btrfs_pause_balance(struct btrfs_fs_info *fs_info) |
4058 | { | |
4059 | int ret = 0; | |
4060 | ||
4061 | mutex_lock(&fs_info->balance_mutex); | |
4062 | if (!fs_info->balance_ctl) { | |
4063 | mutex_unlock(&fs_info->balance_mutex); | |
4064 | return -ENOTCONN; | |
4065 | } | |
4066 | ||
4067 | if (atomic_read(&fs_info->balance_running)) { | |
4068 | atomic_inc(&fs_info->balance_pause_req); | |
4069 | mutex_unlock(&fs_info->balance_mutex); | |
4070 | ||
4071 | wait_event(fs_info->balance_wait_q, | |
4072 | atomic_read(&fs_info->balance_running) == 0); | |
4073 | ||
4074 | mutex_lock(&fs_info->balance_mutex); | |
4075 | /* we are good with balance_ctl ripped off from under us */ | |
4076 | BUG_ON(atomic_read(&fs_info->balance_running)); | |
4077 | atomic_dec(&fs_info->balance_pause_req); | |
4078 | } else { | |
4079 | ret = -ENOTCONN; | |
4080 | } | |
4081 | ||
4082 | mutex_unlock(&fs_info->balance_mutex); | |
4083 | return ret; | |
4084 | } | |
4085 | ||
a7e99c69 ID |
4086 | int btrfs_cancel_balance(struct btrfs_fs_info *fs_info) |
4087 | { | |
e649e587 ID |
4088 | if (fs_info->sb->s_flags & MS_RDONLY) |
4089 | return -EROFS; | |
4090 | ||
a7e99c69 ID |
4091 | mutex_lock(&fs_info->balance_mutex); |
4092 | if (!fs_info->balance_ctl) { | |
4093 | mutex_unlock(&fs_info->balance_mutex); | |
4094 | return -ENOTCONN; | |
4095 | } | |
4096 | ||
4097 | atomic_inc(&fs_info->balance_cancel_req); | |
4098 | /* | |
4099 | * if we are running just wait and return, balance item is | |
4100 | * deleted in btrfs_balance in this case | |
4101 | */ | |
4102 | if (atomic_read(&fs_info->balance_running)) { | |
4103 | mutex_unlock(&fs_info->balance_mutex); | |
4104 | wait_event(fs_info->balance_wait_q, | |
4105 | atomic_read(&fs_info->balance_running) == 0); | |
4106 | mutex_lock(&fs_info->balance_mutex); | |
4107 | } else { | |
4108 | /* __cancel_balance needs volume_mutex */ | |
4109 | mutex_unlock(&fs_info->balance_mutex); | |
4110 | mutex_lock(&fs_info->volume_mutex); | |
4111 | mutex_lock(&fs_info->balance_mutex); | |
4112 | ||
4113 | if (fs_info->balance_ctl) | |
4114 | __cancel_balance(fs_info); | |
4115 | ||
4116 | mutex_unlock(&fs_info->volume_mutex); | |
4117 | } | |
4118 | ||
4119 | BUG_ON(fs_info->balance_ctl || atomic_read(&fs_info->balance_running)); | |
4120 | atomic_dec(&fs_info->balance_cancel_req); | |
4121 | mutex_unlock(&fs_info->balance_mutex); | |
4122 | return 0; | |
4123 | } | |
4124 | ||
803b2f54 SB |
4125 | static int btrfs_uuid_scan_kthread(void *data) |
4126 | { | |
4127 | struct btrfs_fs_info *fs_info = data; | |
4128 | struct btrfs_root *root = fs_info->tree_root; | |
4129 | struct btrfs_key key; | |
4130 | struct btrfs_key max_key; | |
4131 | struct btrfs_path *path = NULL; | |
4132 | int ret = 0; | |
4133 | struct extent_buffer *eb; | |
4134 | int slot; | |
4135 | struct btrfs_root_item root_item; | |
4136 | u32 item_size; | |
f45388f3 | 4137 | struct btrfs_trans_handle *trans = NULL; |
803b2f54 SB |
4138 | |
4139 | path = btrfs_alloc_path(); | |
4140 | if (!path) { | |
4141 | ret = -ENOMEM; | |
4142 | goto out; | |
4143 | } | |
4144 | ||
4145 | key.objectid = 0; | |
4146 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4147 | key.offset = 0; | |
4148 | ||
4149 | max_key.objectid = (u64)-1; | |
4150 | max_key.type = BTRFS_ROOT_ITEM_KEY; | |
4151 | max_key.offset = (u64)-1; | |
4152 | ||
803b2f54 | 4153 | while (1) { |
6174d3cb | 4154 | ret = btrfs_search_forward(root, &key, path, 0); |
803b2f54 SB |
4155 | if (ret) { |
4156 | if (ret > 0) | |
4157 | ret = 0; | |
4158 | break; | |
4159 | } | |
4160 | ||
4161 | if (key.type != BTRFS_ROOT_ITEM_KEY || | |
4162 | (key.objectid < BTRFS_FIRST_FREE_OBJECTID && | |
4163 | key.objectid != BTRFS_FS_TREE_OBJECTID) || | |
4164 | key.objectid > BTRFS_LAST_FREE_OBJECTID) | |
4165 | goto skip; | |
4166 | ||
4167 | eb = path->nodes[0]; | |
4168 | slot = path->slots[0]; | |
4169 | item_size = btrfs_item_size_nr(eb, slot); | |
4170 | if (item_size < sizeof(root_item)) | |
4171 | goto skip; | |
4172 | ||
803b2f54 SB |
4173 | read_extent_buffer(eb, &root_item, |
4174 | btrfs_item_ptr_offset(eb, slot), | |
4175 | (int)sizeof(root_item)); | |
4176 | if (btrfs_root_refs(&root_item) == 0) | |
4177 | goto skip; | |
f45388f3 FDBM |
4178 | |
4179 | if (!btrfs_is_empty_uuid(root_item.uuid) || | |
4180 | !btrfs_is_empty_uuid(root_item.received_uuid)) { | |
4181 | if (trans) | |
4182 | goto update_tree; | |
4183 | ||
4184 | btrfs_release_path(path); | |
803b2f54 SB |
4185 | /* |
4186 | * 1 - subvol uuid item | |
4187 | * 1 - received_subvol uuid item | |
4188 | */ | |
4189 | trans = btrfs_start_transaction(fs_info->uuid_root, 2); | |
4190 | if (IS_ERR(trans)) { | |
4191 | ret = PTR_ERR(trans); | |
4192 | break; | |
4193 | } | |
f45388f3 FDBM |
4194 | continue; |
4195 | } else { | |
4196 | goto skip; | |
4197 | } | |
4198 | update_tree: | |
4199 | if (!btrfs_is_empty_uuid(root_item.uuid)) { | |
6bccf3ab | 4200 | ret = btrfs_uuid_tree_add(trans, fs_info, |
803b2f54 SB |
4201 | root_item.uuid, |
4202 | BTRFS_UUID_KEY_SUBVOL, | |
4203 | key.objectid); | |
4204 | if (ret < 0) { | |
efe120a0 | 4205 | btrfs_warn(fs_info, "uuid_tree_add failed %d", |
803b2f54 | 4206 | ret); |
803b2f54 SB |
4207 | break; |
4208 | } | |
4209 | } | |
4210 | ||
4211 | if (!btrfs_is_empty_uuid(root_item.received_uuid)) { | |
6bccf3ab | 4212 | ret = btrfs_uuid_tree_add(trans, fs_info, |
803b2f54 SB |
4213 | root_item.received_uuid, |
4214 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
4215 | key.objectid); | |
4216 | if (ret < 0) { | |
efe120a0 | 4217 | btrfs_warn(fs_info, "uuid_tree_add failed %d", |
803b2f54 | 4218 | ret); |
803b2f54 SB |
4219 | break; |
4220 | } | |
4221 | } | |
4222 | ||
f45388f3 | 4223 | skip: |
803b2f54 | 4224 | if (trans) { |
3a45bb20 | 4225 | ret = btrfs_end_transaction(trans); |
f45388f3 | 4226 | trans = NULL; |
803b2f54 SB |
4227 | if (ret) |
4228 | break; | |
4229 | } | |
4230 | ||
803b2f54 SB |
4231 | btrfs_release_path(path); |
4232 | if (key.offset < (u64)-1) { | |
4233 | key.offset++; | |
4234 | } else if (key.type < BTRFS_ROOT_ITEM_KEY) { | |
4235 | key.offset = 0; | |
4236 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4237 | } else if (key.objectid < (u64)-1) { | |
4238 | key.offset = 0; | |
4239 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4240 | key.objectid++; | |
4241 | } else { | |
4242 | break; | |
4243 | } | |
4244 | cond_resched(); | |
4245 | } | |
4246 | ||
4247 | out: | |
4248 | btrfs_free_path(path); | |
f45388f3 | 4249 | if (trans && !IS_ERR(trans)) |
3a45bb20 | 4250 | btrfs_end_transaction(trans); |
803b2f54 | 4251 | if (ret) |
efe120a0 | 4252 | btrfs_warn(fs_info, "btrfs_uuid_scan_kthread failed %d", ret); |
70f80175 | 4253 | else |
afcdd129 | 4254 | set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags); |
803b2f54 SB |
4255 | up(&fs_info->uuid_tree_rescan_sem); |
4256 | return 0; | |
4257 | } | |
4258 | ||
70f80175 SB |
4259 | /* |
4260 | * Callback for btrfs_uuid_tree_iterate(). | |
4261 | * returns: | |
4262 | * 0 check succeeded, the entry is not outdated. | |
bb7ab3b9 | 4263 | * < 0 if an error occurred. |
70f80175 SB |
4264 | * > 0 if the check failed, which means the caller shall remove the entry. |
4265 | */ | |
4266 | static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info, | |
4267 | u8 *uuid, u8 type, u64 subid) | |
4268 | { | |
4269 | struct btrfs_key key; | |
4270 | int ret = 0; | |
4271 | struct btrfs_root *subvol_root; | |
4272 | ||
4273 | if (type != BTRFS_UUID_KEY_SUBVOL && | |
4274 | type != BTRFS_UUID_KEY_RECEIVED_SUBVOL) | |
4275 | goto out; | |
4276 | ||
4277 | key.objectid = subid; | |
4278 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4279 | key.offset = (u64)-1; | |
4280 | subvol_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
4281 | if (IS_ERR(subvol_root)) { | |
4282 | ret = PTR_ERR(subvol_root); | |
4283 | if (ret == -ENOENT) | |
4284 | ret = 1; | |
4285 | goto out; | |
4286 | } | |
4287 | ||
4288 | switch (type) { | |
4289 | case BTRFS_UUID_KEY_SUBVOL: | |
4290 | if (memcmp(uuid, subvol_root->root_item.uuid, BTRFS_UUID_SIZE)) | |
4291 | ret = 1; | |
4292 | break; | |
4293 | case BTRFS_UUID_KEY_RECEIVED_SUBVOL: | |
4294 | if (memcmp(uuid, subvol_root->root_item.received_uuid, | |
4295 | BTRFS_UUID_SIZE)) | |
4296 | ret = 1; | |
4297 | break; | |
4298 | } | |
4299 | ||
4300 | out: | |
4301 | return ret; | |
4302 | } | |
4303 | ||
4304 | static int btrfs_uuid_rescan_kthread(void *data) | |
4305 | { | |
4306 | struct btrfs_fs_info *fs_info = (struct btrfs_fs_info *)data; | |
4307 | int ret; | |
4308 | ||
4309 | /* | |
4310 | * 1st step is to iterate through the existing UUID tree and | |
4311 | * to delete all entries that contain outdated data. | |
4312 | * 2nd step is to add all missing entries to the UUID tree. | |
4313 | */ | |
4314 | ret = btrfs_uuid_tree_iterate(fs_info, btrfs_check_uuid_tree_entry); | |
4315 | if (ret < 0) { | |
efe120a0 | 4316 | btrfs_warn(fs_info, "iterating uuid_tree failed %d", ret); |
70f80175 SB |
4317 | up(&fs_info->uuid_tree_rescan_sem); |
4318 | return ret; | |
4319 | } | |
4320 | return btrfs_uuid_scan_kthread(data); | |
4321 | } | |
4322 | ||
f7a81ea4 SB |
4323 | int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info) |
4324 | { | |
4325 | struct btrfs_trans_handle *trans; | |
4326 | struct btrfs_root *tree_root = fs_info->tree_root; | |
4327 | struct btrfs_root *uuid_root; | |
803b2f54 SB |
4328 | struct task_struct *task; |
4329 | int ret; | |
f7a81ea4 SB |
4330 | |
4331 | /* | |
4332 | * 1 - root node | |
4333 | * 1 - root item | |
4334 | */ | |
4335 | trans = btrfs_start_transaction(tree_root, 2); | |
4336 | if (IS_ERR(trans)) | |
4337 | return PTR_ERR(trans); | |
4338 | ||
4339 | uuid_root = btrfs_create_tree(trans, fs_info, | |
4340 | BTRFS_UUID_TREE_OBJECTID); | |
4341 | if (IS_ERR(uuid_root)) { | |
6d13f549 | 4342 | ret = PTR_ERR(uuid_root); |
66642832 | 4343 | btrfs_abort_transaction(trans, ret); |
3a45bb20 | 4344 | btrfs_end_transaction(trans); |
6d13f549 | 4345 | return ret; |
f7a81ea4 SB |
4346 | } |
4347 | ||
4348 | fs_info->uuid_root = uuid_root; | |
4349 | ||
3a45bb20 | 4350 | ret = btrfs_commit_transaction(trans); |
803b2f54 SB |
4351 | if (ret) |
4352 | return ret; | |
4353 | ||
4354 | down(&fs_info->uuid_tree_rescan_sem); | |
4355 | task = kthread_run(btrfs_uuid_scan_kthread, fs_info, "btrfs-uuid"); | |
4356 | if (IS_ERR(task)) { | |
70f80175 | 4357 | /* fs_info->update_uuid_tree_gen remains 0 in all error case */ |
efe120a0 | 4358 | btrfs_warn(fs_info, "failed to start uuid_scan task"); |
803b2f54 SB |
4359 | up(&fs_info->uuid_tree_rescan_sem); |
4360 | return PTR_ERR(task); | |
4361 | } | |
4362 | ||
4363 | return 0; | |
f7a81ea4 | 4364 | } |
803b2f54 | 4365 | |
70f80175 SB |
4366 | int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info) |
4367 | { | |
4368 | struct task_struct *task; | |
4369 | ||
4370 | down(&fs_info->uuid_tree_rescan_sem); | |
4371 | task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid"); | |
4372 | if (IS_ERR(task)) { | |
4373 | /* fs_info->update_uuid_tree_gen remains 0 in all error case */ | |
efe120a0 | 4374 | btrfs_warn(fs_info, "failed to start uuid_rescan task"); |
70f80175 SB |
4375 | up(&fs_info->uuid_tree_rescan_sem); |
4376 | return PTR_ERR(task); | |
4377 | } | |
4378 | ||
4379 | return 0; | |
4380 | } | |
4381 | ||
8f18cf13 CM |
4382 | /* |
4383 | * shrinking a device means finding all of the device extents past | |
4384 | * the new size, and then following the back refs to the chunks. | |
4385 | * The chunk relocation code actually frees the device extent | |
4386 | */ | |
4387 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
4388 | { | |
0b246afa JM |
4389 | struct btrfs_fs_info *fs_info = device->fs_info; |
4390 | struct btrfs_root *root = fs_info->dev_root; | |
8f18cf13 | 4391 | struct btrfs_trans_handle *trans; |
8f18cf13 CM |
4392 | struct btrfs_dev_extent *dev_extent = NULL; |
4393 | struct btrfs_path *path; | |
4394 | u64 length; | |
8f18cf13 CM |
4395 | u64 chunk_offset; |
4396 | int ret; | |
4397 | int slot; | |
ba1bf481 JB |
4398 | int failed = 0; |
4399 | bool retried = false; | |
53e489bc | 4400 | bool checked_pending_chunks = false; |
8f18cf13 CM |
4401 | struct extent_buffer *l; |
4402 | struct btrfs_key key; | |
0b246afa | 4403 | struct btrfs_super_block *super_copy = fs_info->super_copy; |
8f18cf13 | 4404 | u64 old_total = btrfs_super_total_bytes(super_copy); |
7cc8e58d | 4405 | u64 old_size = btrfs_device_get_total_bytes(device); |
7dfb8be1 NB |
4406 | u64 diff; |
4407 | ||
4408 | new_size = round_down(new_size, fs_info->sectorsize); | |
4409 | diff = old_size - new_size; | |
8f18cf13 | 4410 | |
63a212ab SB |
4411 | if (device->is_tgtdev_for_dev_replace) |
4412 | return -EINVAL; | |
4413 | ||
8f18cf13 CM |
4414 | path = btrfs_alloc_path(); |
4415 | if (!path) | |
4416 | return -ENOMEM; | |
4417 | ||
e4058b54 | 4418 | path->reada = READA_FORWARD; |
8f18cf13 | 4419 | |
34441361 | 4420 | mutex_lock(&fs_info->chunk_mutex); |
7d9eb12c | 4421 | |
7cc8e58d | 4422 | btrfs_device_set_total_bytes(device, new_size); |
2bf64758 | 4423 | if (device->writeable) { |
2b82032c | 4424 | device->fs_devices->total_rw_bytes -= diff; |
a5ed45f8 | 4425 | atomic64_sub(diff, &fs_info->free_chunk_space); |
2bf64758 | 4426 | } |
34441361 | 4427 | mutex_unlock(&fs_info->chunk_mutex); |
8f18cf13 | 4428 | |
ba1bf481 | 4429 | again: |
8f18cf13 CM |
4430 | key.objectid = device->devid; |
4431 | key.offset = (u64)-1; | |
4432 | key.type = BTRFS_DEV_EXTENT_KEY; | |
4433 | ||
213e64da | 4434 | do { |
0b246afa | 4435 | mutex_lock(&fs_info->delete_unused_bgs_mutex); |
8f18cf13 | 4436 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
67c5e7d4 | 4437 | if (ret < 0) { |
0b246afa | 4438 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
8f18cf13 | 4439 | goto done; |
67c5e7d4 | 4440 | } |
8f18cf13 CM |
4441 | |
4442 | ret = btrfs_previous_item(root, path, 0, key.type); | |
67c5e7d4 | 4443 | if (ret) |
0b246afa | 4444 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
8f18cf13 CM |
4445 | if (ret < 0) |
4446 | goto done; | |
4447 | if (ret) { | |
4448 | ret = 0; | |
b3b4aa74 | 4449 | btrfs_release_path(path); |
bf1fb512 | 4450 | break; |
8f18cf13 CM |
4451 | } |
4452 | ||
4453 | l = path->nodes[0]; | |
4454 | slot = path->slots[0]; | |
4455 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
4456 | ||
ba1bf481 | 4457 | if (key.objectid != device->devid) { |
0b246afa | 4458 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
b3b4aa74 | 4459 | btrfs_release_path(path); |
bf1fb512 | 4460 | break; |
ba1bf481 | 4461 | } |
8f18cf13 CM |
4462 | |
4463 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
4464 | length = btrfs_dev_extent_length(l, dev_extent); | |
4465 | ||
ba1bf481 | 4466 | if (key.offset + length <= new_size) { |
0b246afa | 4467 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
b3b4aa74 | 4468 | btrfs_release_path(path); |
d6397bae | 4469 | break; |
ba1bf481 | 4470 | } |
8f18cf13 | 4471 | |
8f18cf13 | 4472 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
b3b4aa74 | 4473 | btrfs_release_path(path); |
8f18cf13 | 4474 | |
0b246afa JM |
4475 | ret = btrfs_relocate_chunk(fs_info, chunk_offset); |
4476 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
ba1bf481 | 4477 | if (ret && ret != -ENOSPC) |
8f18cf13 | 4478 | goto done; |
ba1bf481 JB |
4479 | if (ret == -ENOSPC) |
4480 | failed++; | |
213e64da | 4481 | } while (key.offset-- > 0); |
ba1bf481 JB |
4482 | |
4483 | if (failed && !retried) { | |
4484 | failed = 0; | |
4485 | retried = true; | |
4486 | goto again; | |
4487 | } else if (failed && retried) { | |
4488 | ret = -ENOSPC; | |
ba1bf481 | 4489 | goto done; |
8f18cf13 CM |
4490 | } |
4491 | ||
d6397bae | 4492 | /* Shrinking succeeded, else we would be at "done". */ |
a22285a6 | 4493 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
4494 | if (IS_ERR(trans)) { |
4495 | ret = PTR_ERR(trans); | |
4496 | goto done; | |
4497 | } | |
4498 | ||
34441361 | 4499 | mutex_lock(&fs_info->chunk_mutex); |
53e489bc FM |
4500 | |
4501 | /* | |
4502 | * We checked in the above loop all device extents that were already in | |
4503 | * the device tree. However before we have updated the device's | |
4504 | * total_bytes to the new size, we might have had chunk allocations that | |
4505 | * have not complete yet (new block groups attached to transaction | |
4506 | * handles), and therefore their device extents were not yet in the | |
4507 | * device tree and we missed them in the loop above. So if we have any | |
4508 | * pending chunk using a device extent that overlaps the device range | |
4509 | * that we can not use anymore, commit the current transaction and | |
4510 | * repeat the search on the device tree - this way we guarantee we will | |
4511 | * not have chunks using device extents that end beyond 'new_size'. | |
4512 | */ | |
4513 | if (!checked_pending_chunks) { | |
4514 | u64 start = new_size; | |
4515 | u64 len = old_size - new_size; | |
4516 | ||
499f377f JM |
4517 | if (contains_pending_extent(trans->transaction, device, |
4518 | &start, len)) { | |
34441361 | 4519 | mutex_unlock(&fs_info->chunk_mutex); |
53e489bc FM |
4520 | checked_pending_chunks = true; |
4521 | failed = 0; | |
4522 | retried = false; | |
3a45bb20 | 4523 | ret = btrfs_commit_transaction(trans); |
53e489bc FM |
4524 | if (ret) |
4525 | goto done; | |
4526 | goto again; | |
4527 | } | |
4528 | } | |
4529 | ||
7cc8e58d | 4530 | btrfs_device_set_disk_total_bytes(device, new_size); |
935e5cc9 MX |
4531 | if (list_empty(&device->resized_list)) |
4532 | list_add_tail(&device->resized_list, | |
0b246afa | 4533 | &fs_info->fs_devices->resized_devices); |
d6397bae | 4534 | |
d6397bae | 4535 | WARN_ON(diff > old_total); |
7dfb8be1 NB |
4536 | btrfs_set_super_total_bytes(super_copy, |
4537 | round_down(old_total - diff, fs_info->sectorsize)); | |
34441361 | 4538 | mutex_unlock(&fs_info->chunk_mutex); |
2196d6e8 MX |
4539 | |
4540 | /* Now btrfs_update_device() will change the on-disk size. */ | |
4541 | ret = btrfs_update_device(trans, device); | |
3a45bb20 | 4542 | btrfs_end_transaction(trans); |
8f18cf13 CM |
4543 | done: |
4544 | btrfs_free_path(path); | |
53e489bc | 4545 | if (ret) { |
34441361 | 4546 | mutex_lock(&fs_info->chunk_mutex); |
53e489bc FM |
4547 | btrfs_device_set_total_bytes(device, old_size); |
4548 | if (device->writeable) | |
4549 | device->fs_devices->total_rw_bytes += diff; | |
a5ed45f8 | 4550 | atomic64_add(diff, &fs_info->free_chunk_space); |
34441361 | 4551 | mutex_unlock(&fs_info->chunk_mutex); |
53e489bc | 4552 | } |
8f18cf13 CM |
4553 | return ret; |
4554 | } | |
4555 | ||
2ff7e61e | 4556 | static int btrfs_add_system_chunk(struct btrfs_fs_info *fs_info, |
0b86a832 CM |
4557 | struct btrfs_key *key, |
4558 | struct btrfs_chunk *chunk, int item_size) | |
4559 | { | |
0b246afa | 4560 | struct btrfs_super_block *super_copy = fs_info->super_copy; |
0b86a832 CM |
4561 | struct btrfs_disk_key disk_key; |
4562 | u32 array_size; | |
4563 | u8 *ptr; | |
4564 | ||
34441361 | 4565 | mutex_lock(&fs_info->chunk_mutex); |
0b86a832 | 4566 | array_size = btrfs_super_sys_array_size(super_copy); |
5f43f86e | 4567 | if (array_size + item_size + sizeof(disk_key) |
fe48a5c0 | 4568 | > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) { |
34441361 | 4569 | mutex_unlock(&fs_info->chunk_mutex); |
0b86a832 | 4570 | return -EFBIG; |
fe48a5c0 | 4571 | } |
0b86a832 CM |
4572 | |
4573 | ptr = super_copy->sys_chunk_array + array_size; | |
4574 | btrfs_cpu_key_to_disk(&disk_key, key); | |
4575 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
4576 | ptr += sizeof(disk_key); | |
4577 | memcpy(ptr, chunk, item_size); | |
4578 | item_size += sizeof(disk_key); | |
4579 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
34441361 | 4580 | mutex_unlock(&fs_info->chunk_mutex); |
fe48a5c0 | 4581 | |
0b86a832 CM |
4582 | return 0; |
4583 | } | |
4584 | ||
73c5de00 AJ |
4585 | /* |
4586 | * sort the devices in descending order by max_avail, total_avail | |
4587 | */ | |
4588 | static int btrfs_cmp_device_info(const void *a, const void *b) | |
9b3f68b9 | 4589 | { |
73c5de00 AJ |
4590 | const struct btrfs_device_info *di_a = a; |
4591 | const struct btrfs_device_info *di_b = b; | |
9b3f68b9 | 4592 | |
73c5de00 | 4593 | if (di_a->max_avail > di_b->max_avail) |
b2117a39 | 4594 | return -1; |
73c5de00 | 4595 | if (di_a->max_avail < di_b->max_avail) |
b2117a39 | 4596 | return 1; |
73c5de00 AJ |
4597 | if (di_a->total_avail > di_b->total_avail) |
4598 | return -1; | |
4599 | if (di_a->total_avail < di_b->total_avail) | |
4600 | return 1; | |
4601 | return 0; | |
b2117a39 | 4602 | } |
0b86a832 | 4603 | |
53b381b3 DW |
4604 | static u32 find_raid56_stripe_len(u32 data_devices, u32 dev_stripe_target) |
4605 | { | |
4606 | /* TODO allow them to set a preferred stripe size */ | |
ee22184b | 4607 | return SZ_64K; |
53b381b3 DW |
4608 | } |
4609 | ||
4610 | static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type) | |
4611 | { | |
ffe2d203 | 4612 | if (!(type & BTRFS_BLOCK_GROUP_RAID56_MASK)) |
53b381b3 DW |
4613 | return; |
4614 | ||
ceda0864 | 4615 | btrfs_set_fs_incompat(info, RAID56); |
53b381b3 DW |
4616 | } |
4617 | ||
da17066c | 4618 | #define BTRFS_MAX_DEVS(r) ((BTRFS_MAX_ITEM_SIZE(r->fs_info) \ |
23f8f9b7 GH |
4619 | - sizeof(struct btrfs_chunk)) \ |
4620 | / sizeof(struct btrfs_stripe) + 1) | |
4621 | ||
4622 | #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \ | |
4623 | - 2 * sizeof(struct btrfs_disk_key) \ | |
4624 | - 2 * sizeof(struct btrfs_chunk)) \ | |
4625 | / sizeof(struct btrfs_stripe) + 1) | |
4626 | ||
73c5de00 | 4627 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
72b468c8 | 4628 | u64 start, u64 type) |
b2117a39 | 4629 | { |
2ff7e61e | 4630 | struct btrfs_fs_info *info = trans->fs_info; |
73c5de00 AJ |
4631 | struct btrfs_fs_devices *fs_devices = info->fs_devices; |
4632 | struct list_head *cur; | |
4633 | struct map_lookup *map = NULL; | |
4634 | struct extent_map_tree *em_tree; | |
4635 | struct extent_map *em; | |
4636 | struct btrfs_device_info *devices_info = NULL; | |
4637 | u64 total_avail; | |
4638 | int num_stripes; /* total number of stripes to allocate */ | |
53b381b3 DW |
4639 | int data_stripes; /* number of stripes that count for |
4640 | block group size */ | |
73c5de00 AJ |
4641 | int sub_stripes; /* sub_stripes info for map */ |
4642 | int dev_stripes; /* stripes per dev */ | |
4643 | int devs_max; /* max devs to use */ | |
4644 | int devs_min; /* min devs needed */ | |
4645 | int devs_increment; /* ndevs has to be a multiple of this */ | |
4646 | int ncopies; /* how many copies to data has */ | |
4647 | int ret; | |
4648 | u64 max_stripe_size; | |
4649 | u64 max_chunk_size; | |
4650 | u64 stripe_size; | |
4651 | u64 num_bytes; | |
53b381b3 | 4652 | u64 raid_stripe_len = BTRFS_STRIPE_LEN; |
73c5de00 AJ |
4653 | int ndevs; |
4654 | int i; | |
4655 | int j; | |
31e50229 | 4656 | int index; |
593060d7 | 4657 | |
0c460c0d | 4658 | BUG_ON(!alloc_profile_is_valid(type, 0)); |
9b3f68b9 | 4659 | |
73c5de00 AJ |
4660 | if (list_empty(&fs_devices->alloc_list)) |
4661 | return -ENOSPC; | |
b2117a39 | 4662 | |
31e50229 | 4663 | index = __get_raid_index(type); |
73c5de00 | 4664 | |
31e50229 LB |
4665 | sub_stripes = btrfs_raid_array[index].sub_stripes; |
4666 | dev_stripes = btrfs_raid_array[index].dev_stripes; | |
4667 | devs_max = btrfs_raid_array[index].devs_max; | |
4668 | devs_min = btrfs_raid_array[index].devs_min; | |
4669 | devs_increment = btrfs_raid_array[index].devs_increment; | |
4670 | ncopies = btrfs_raid_array[index].ncopies; | |
b2117a39 | 4671 | |
9b3f68b9 | 4672 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
ee22184b | 4673 | max_stripe_size = SZ_1G; |
73c5de00 | 4674 | max_chunk_size = 10 * max_stripe_size; |
23f8f9b7 GH |
4675 | if (!devs_max) |
4676 | devs_max = BTRFS_MAX_DEVS(info->chunk_root); | |
9b3f68b9 | 4677 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
1100373f | 4678 | /* for larger filesystems, use larger metadata chunks */ |
ee22184b BL |
4679 | if (fs_devices->total_rw_bytes > 50ULL * SZ_1G) |
4680 | max_stripe_size = SZ_1G; | |
1100373f | 4681 | else |
ee22184b | 4682 | max_stripe_size = SZ_256M; |
73c5de00 | 4683 | max_chunk_size = max_stripe_size; |
23f8f9b7 GH |
4684 | if (!devs_max) |
4685 | devs_max = BTRFS_MAX_DEVS(info->chunk_root); | |
a40a90a0 | 4686 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
ee22184b | 4687 | max_stripe_size = SZ_32M; |
73c5de00 | 4688 | max_chunk_size = 2 * max_stripe_size; |
23f8f9b7 GH |
4689 | if (!devs_max) |
4690 | devs_max = BTRFS_MAX_DEVS_SYS_CHUNK; | |
73c5de00 | 4691 | } else { |
351fd353 | 4692 | btrfs_err(info, "invalid chunk type 0x%llx requested", |
73c5de00 AJ |
4693 | type); |
4694 | BUG_ON(1); | |
9b3f68b9 CM |
4695 | } |
4696 | ||
2b82032c YZ |
4697 | /* we don't want a chunk larger than 10% of writeable space */ |
4698 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
4699 | max_chunk_size); | |
9b3f68b9 | 4700 | |
31e818fe | 4701 | devices_info = kcalloc(fs_devices->rw_devices, sizeof(*devices_info), |
73c5de00 AJ |
4702 | GFP_NOFS); |
4703 | if (!devices_info) | |
4704 | return -ENOMEM; | |
0cad8a11 | 4705 | |
73c5de00 | 4706 | cur = fs_devices->alloc_list.next; |
9b3f68b9 | 4707 | |
9f680ce0 | 4708 | /* |
73c5de00 AJ |
4709 | * in the first pass through the devices list, we gather information |
4710 | * about the available holes on each device. | |
9f680ce0 | 4711 | */ |
73c5de00 AJ |
4712 | ndevs = 0; |
4713 | while (cur != &fs_devices->alloc_list) { | |
4714 | struct btrfs_device *device; | |
4715 | u64 max_avail; | |
4716 | u64 dev_offset; | |
b2117a39 | 4717 | |
73c5de00 | 4718 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
9f680ce0 | 4719 | |
73c5de00 | 4720 | cur = cur->next; |
b2117a39 | 4721 | |
73c5de00 | 4722 | if (!device->writeable) { |
31b1a2bd | 4723 | WARN(1, KERN_ERR |
efe120a0 | 4724 | "BTRFS: read-only device in alloc_list\n"); |
73c5de00 AJ |
4725 | continue; |
4726 | } | |
b2117a39 | 4727 | |
63a212ab SB |
4728 | if (!device->in_fs_metadata || |
4729 | device->is_tgtdev_for_dev_replace) | |
73c5de00 | 4730 | continue; |
b2117a39 | 4731 | |
73c5de00 AJ |
4732 | if (device->total_bytes > device->bytes_used) |
4733 | total_avail = device->total_bytes - device->bytes_used; | |
4734 | else | |
4735 | total_avail = 0; | |
38c01b96 | 4736 | |
4737 | /* If there is no space on this device, skip it. */ | |
4738 | if (total_avail == 0) | |
4739 | continue; | |
b2117a39 | 4740 | |
6df9a95e | 4741 | ret = find_free_dev_extent(trans, device, |
73c5de00 AJ |
4742 | max_stripe_size * dev_stripes, |
4743 | &dev_offset, &max_avail); | |
4744 | if (ret && ret != -ENOSPC) | |
4745 | goto error; | |
b2117a39 | 4746 | |
73c5de00 AJ |
4747 | if (ret == 0) |
4748 | max_avail = max_stripe_size * dev_stripes; | |
b2117a39 | 4749 | |
73c5de00 AJ |
4750 | if (max_avail < BTRFS_STRIPE_LEN * dev_stripes) |
4751 | continue; | |
b2117a39 | 4752 | |
063d006f ES |
4753 | if (ndevs == fs_devices->rw_devices) { |
4754 | WARN(1, "%s: found more than %llu devices\n", | |
4755 | __func__, fs_devices->rw_devices); | |
4756 | break; | |
4757 | } | |
73c5de00 AJ |
4758 | devices_info[ndevs].dev_offset = dev_offset; |
4759 | devices_info[ndevs].max_avail = max_avail; | |
4760 | devices_info[ndevs].total_avail = total_avail; | |
4761 | devices_info[ndevs].dev = device; | |
4762 | ++ndevs; | |
4763 | } | |
b2117a39 | 4764 | |
73c5de00 AJ |
4765 | /* |
4766 | * now sort the devices by hole size / available space | |
4767 | */ | |
4768 | sort(devices_info, ndevs, sizeof(struct btrfs_device_info), | |
4769 | btrfs_cmp_device_info, NULL); | |
b2117a39 | 4770 | |
73c5de00 AJ |
4771 | /* round down to number of usable stripes */ |
4772 | ndevs -= ndevs % devs_increment; | |
b2117a39 | 4773 | |
73c5de00 AJ |
4774 | if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) { |
4775 | ret = -ENOSPC; | |
4776 | goto error; | |
b2117a39 | 4777 | } |
9f680ce0 | 4778 | |
73c5de00 AJ |
4779 | if (devs_max && ndevs > devs_max) |
4780 | ndevs = devs_max; | |
4781 | /* | |
4782 | * the primary goal is to maximize the number of stripes, so use as many | |
4783 | * devices as possible, even if the stripes are not maximum sized. | |
4784 | */ | |
4785 | stripe_size = devices_info[ndevs-1].max_avail; | |
4786 | num_stripes = ndevs * dev_stripes; | |
b2117a39 | 4787 | |
53b381b3 DW |
4788 | /* |
4789 | * this will have to be fixed for RAID1 and RAID10 over | |
4790 | * more drives | |
4791 | */ | |
4792 | data_stripes = num_stripes / ncopies; | |
4793 | ||
53b381b3 DW |
4794 | if (type & BTRFS_BLOCK_GROUP_RAID5) { |
4795 | raid_stripe_len = find_raid56_stripe_len(ndevs - 1, | |
da17066c | 4796 | info->stripesize); |
53b381b3 DW |
4797 | data_stripes = num_stripes - 1; |
4798 | } | |
4799 | if (type & BTRFS_BLOCK_GROUP_RAID6) { | |
4800 | raid_stripe_len = find_raid56_stripe_len(ndevs - 2, | |
da17066c | 4801 | info->stripesize); |
53b381b3 DW |
4802 | data_stripes = num_stripes - 2; |
4803 | } | |
86db2578 CM |
4804 | |
4805 | /* | |
4806 | * Use the number of data stripes to figure out how big this chunk | |
4807 | * is really going to be in terms of logical address space, | |
4808 | * and compare that answer with the max chunk size | |
4809 | */ | |
4810 | if (stripe_size * data_stripes > max_chunk_size) { | |
4811 | u64 mask = (1ULL << 24) - 1; | |
b8b93add DS |
4812 | |
4813 | stripe_size = div_u64(max_chunk_size, data_stripes); | |
86db2578 CM |
4814 | |
4815 | /* bump the answer up to a 16MB boundary */ | |
4816 | stripe_size = (stripe_size + mask) & ~mask; | |
4817 | ||
4818 | /* but don't go higher than the limits we found | |
4819 | * while searching for free extents | |
4820 | */ | |
4821 | if (stripe_size > devices_info[ndevs-1].max_avail) | |
4822 | stripe_size = devices_info[ndevs-1].max_avail; | |
4823 | } | |
4824 | ||
b8b93add | 4825 | stripe_size = div_u64(stripe_size, dev_stripes); |
37db63a4 ID |
4826 | |
4827 | /* align to BTRFS_STRIPE_LEN */ | |
42c61ab6 | 4828 | stripe_size = div64_u64(stripe_size, raid_stripe_len); |
53b381b3 | 4829 | stripe_size *= raid_stripe_len; |
b2117a39 MX |
4830 | |
4831 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
4832 | if (!map) { | |
4833 | ret = -ENOMEM; | |
4834 | goto error; | |
4835 | } | |
4836 | map->num_stripes = num_stripes; | |
9b3f68b9 | 4837 | |
73c5de00 AJ |
4838 | for (i = 0; i < ndevs; ++i) { |
4839 | for (j = 0; j < dev_stripes; ++j) { | |
4840 | int s = i * dev_stripes + j; | |
4841 | map->stripes[s].dev = devices_info[i].dev; | |
4842 | map->stripes[s].physical = devices_info[i].dev_offset + | |
4843 | j * stripe_size; | |
6324fbf3 | 4844 | } |
6324fbf3 | 4845 | } |
da17066c | 4846 | map->sector_size = info->sectorsize; |
53b381b3 DW |
4847 | map->stripe_len = raid_stripe_len; |
4848 | map->io_align = raid_stripe_len; | |
4849 | map->io_width = raid_stripe_len; | |
2b82032c | 4850 | map->type = type; |
2b82032c | 4851 | map->sub_stripes = sub_stripes; |
0b86a832 | 4852 | |
53b381b3 | 4853 | num_bytes = stripe_size * data_stripes; |
0b86a832 | 4854 | |
6bccf3ab | 4855 | trace_btrfs_chunk_alloc(info, map, start, num_bytes); |
1abe9b8a | 4856 | |
172ddd60 | 4857 | em = alloc_extent_map(); |
2b82032c | 4858 | if (!em) { |
298a8f9c | 4859 | kfree(map); |
b2117a39 MX |
4860 | ret = -ENOMEM; |
4861 | goto error; | |
593060d7 | 4862 | } |
298a8f9c | 4863 | set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags); |
95617d69 | 4864 | em->map_lookup = map; |
2b82032c | 4865 | em->start = start; |
73c5de00 | 4866 | em->len = num_bytes; |
2b82032c YZ |
4867 | em->block_start = 0; |
4868 | em->block_len = em->len; | |
6df9a95e | 4869 | em->orig_block_len = stripe_size; |
593060d7 | 4870 | |
0b246afa | 4871 | em_tree = &info->mapping_tree.map_tree; |
890871be | 4872 | write_lock(&em_tree->lock); |
09a2a8f9 | 4873 | ret = add_extent_mapping(em_tree, em, 0); |
6df9a95e JB |
4874 | if (!ret) { |
4875 | list_add_tail(&em->list, &trans->transaction->pending_chunks); | |
490b54d6 | 4876 | refcount_inc(&em->refs); |
6df9a95e | 4877 | } |
890871be | 4878 | write_unlock(&em_tree->lock); |
0f5d42b2 JB |
4879 | if (ret) { |
4880 | free_extent_map(em); | |
1dd4602f | 4881 | goto error; |
0f5d42b2 | 4882 | } |
0b86a832 | 4883 | |
2ff7e61e | 4884 | ret = btrfs_make_block_group(trans, info, 0, type, |
04487488 JB |
4885 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, |
4886 | start, num_bytes); | |
6df9a95e JB |
4887 | if (ret) |
4888 | goto error_del_extent; | |
2b82032c | 4889 | |
7cc8e58d MX |
4890 | for (i = 0; i < map->num_stripes; i++) { |
4891 | num_bytes = map->stripes[i].dev->bytes_used + stripe_size; | |
4892 | btrfs_device_set_bytes_used(map->stripes[i].dev, num_bytes); | |
4893 | } | |
43530c46 | 4894 | |
a5ed45f8 | 4895 | atomic64_sub(stripe_size * map->num_stripes, &info->free_chunk_space); |
1c116187 | 4896 | |
0f5d42b2 | 4897 | free_extent_map(em); |
0b246afa | 4898 | check_raid56_incompat_flag(info, type); |
53b381b3 | 4899 | |
b2117a39 | 4900 | kfree(devices_info); |
2b82032c | 4901 | return 0; |
b2117a39 | 4902 | |
6df9a95e | 4903 | error_del_extent: |
0f5d42b2 JB |
4904 | write_lock(&em_tree->lock); |
4905 | remove_extent_mapping(em_tree, em); | |
4906 | write_unlock(&em_tree->lock); | |
4907 | ||
4908 | /* One for our allocation */ | |
4909 | free_extent_map(em); | |
4910 | /* One for the tree reference */ | |
4911 | free_extent_map(em); | |
495e64f4 FM |
4912 | /* One for the pending_chunks list reference */ |
4913 | free_extent_map(em); | |
b2117a39 | 4914 | error: |
b2117a39 MX |
4915 | kfree(devices_info); |
4916 | return ret; | |
2b82032c YZ |
4917 | } |
4918 | ||
6df9a95e | 4919 | int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, |
6bccf3ab | 4920 | struct btrfs_fs_info *fs_info, |
6df9a95e | 4921 | u64 chunk_offset, u64 chunk_size) |
2b82032c | 4922 | { |
6bccf3ab JM |
4923 | struct btrfs_root *extent_root = fs_info->extent_root; |
4924 | struct btrfs_root *chunk_root = fs_info->chunk_root; | |
2b82032c | 4925 | struct btrfs_key key; |
2b82032c YZ |
4926 | struct btrfs_device *device; |
4927 | struct btrfs_chunk *chunk; | |
4928 | struct btrfs_stripe *stripe; | |
6df9a95e JB |
4929 | struct extent_map *em; |
4930 | struct map_lookup *map; | |
4931 | size_t item_size; | |
4932 | u64 dev_offset; | |
4933 | u64 stripe_size; | |
4934 | int i = 0; | |
140e639f | 4935 | int ret = 0; |
2b82032c | 4936 | |
592d92ee LB |
4937 | em = get_chunk_map(fs_info, chunk_offset, chunk_size); |
4938 | if (IS_ERR(em)) | |
4939 | return PTR_ERR(em); | |
6df9a95e | 4940 | |
95617d69 | 4941 | map = em->map_lookup; |
6df9a95e JB |
4942 | item_size = btrfs_chunk_item_size(map->num_stripes); |
4943 | stripe_size = em->orig_block_len; | |
4944 | ||
2b82032c | 4945 | chunk = kzalloc(item_size, GFP_NOFS); |
6df9a95e JB |
4946 | if (!chunk) { |
4947 | ret = -ENOMEM; | |
4948 | goto out; | |
4949 | } | |
4950 | ||
50460e37 FM |
4951 | /* |
4952 | * Take the device list mutex to prevent races with the final phase of | |
4953 | * a device replace operation that replaces the device object associated | |
4954 | * with the map's stripes, because the device object's id can change | |
4955 | * at any time during that final phase of the device replace operation | |
4956 | * (dev-replace.c:btrfs_dev_replace_finishing()). | |
4957 | */ | |
0b246afa | 4958 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
6df9a95e JB |
4959 | for (i = 0; i < map->num_stripes; i++) { |
4960 | device = map->stripes[i].dev; | |
4961 | dev_offset = map->stripes[i].physical; | |
2b82032c | 4962 | |
0b86a832 | 4963 | ret = btrfs_update_device(trans, device); |
3acd3953 | 4964 | if (ret) |
50460e37 | 4965 | break; |
6df9a95e JB |
4966 | ret = btrfs_alloc_dev_extent(trans, device, |
4967 | chunk_root->root_key.objectid, | |
4968 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
4969 | chunk_offset, dev_offset, | |
4970 | stripe_size); | |
4971 | if (ret) | |
50460e37 FM |
4972 | break; |
4973 | } | |
4974 | if (ret) { | |
0b246afa | 4975 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
50460e37 | 4976 | goto out; |
2b82032c YZ |
4977 | } |
4978 | ||
2b82032c | 4979 | stripe = &chunk->stripe; |
6df9a95e JB |
4980 | for (i = 0; i < map->num_stripes; i++) { |
4981 | device = map->stripes[i].dev; | |
4982 | dev_offset = map->stripes[i].physical; | |
0b86a832 | 4983 | |
e17cade2 CM |
4984 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
4985 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
4986 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 4987 | stripe++; |
0b86a832 | 4988 | } |
0b246afa | 4989 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
0b86a832 | 4990 | |
2b82032c | 4991 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 4992 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
4993 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
4994 | btrfs_set_stack_chunk_type(chunk, map->type); | |
4995 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
4996 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
4997 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b246afa | 4998 | btrfs_set_stack_chunk_sector_size(chunk, fs_info->sectorsize); |
2b82032c | 4999 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 5000 | |
2b82032c YZ |
5001 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
5002 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
5003 | key.offset = chunk_offset; | |
0b86a832 | 5004 | |
2b82032c | 5005 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
4ed1d16e MF |
5006 | if (ret == 0 && map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
5007 | /* | |
5008 | * TODO: Cleanup of inserted chunk root in case of | |
5009 | * failure. | |
5010 | */ | |
2ff7e61e | 5011 | ret = btrfs_add_system_chunk(fs_info, &key, chunk, item_size); |
8f18cf13 | 5012 | } |
1abe9b8a | 5013 | |
6df9a95e | 5014 | out: |
0b86a832 | 5015 | kfree(chunk); |
6df9a95e | 5016 | free_extent_map(em); |
4ed1d16e | 5017 | return ret; |
2b82032c | 5018 | } |
0b86a832 | 5019 | |
2b82032c YZ |
5020 | /* |
5021 | * Chunk allocation falls into two parts. The first part does works | |
5022 | * that make the new allocated chunk useable, but not do any operation | |
5023 | * that modifies the chunk tree. The second part does the works that | |
5024 | * require modifying the chunk tree. This division is important for the | |
5025 | * bootstrap process of adding storage to a seed btrfs. | |
5026 | */ | |
5027 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2ff7e61e | 5028 | struct btrfs_fs_info *fs_info, u64 type) |
2b82032c YZ |
5029 | { |
5030 | u64 chunk_offset; | |
2b82032c | 5031 | |
0b246afa JM |
5032 | ASSERT(mutex_is_locked(&fs_info->chunk_mutex)); |
5033 | chunk_offset = find_next_chunk(fs_info); | |
72b468c8 | 5034 | return __btrfs_alloc_chunk(trans, chunk_offset, type); |
2b82032c YZ |
5035 | } |
5036 | ||
d397712b | 5037 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
e4a4dce7 | 5038 | struct btrfs_fs_info *fs_info) |
2b82032c YZ |
5039 | { |
5040 | u64 chunk_offset; | |
5041 | u64 sys_chunk_offset; | |
2b82032c | 5042 | u64 alloc_profile; |
2b82032c YZ |
5043 | int ret; |
5044 | ||
6df9a95e | 5045 | chunk_offset = find_next_chunk(fs_info); |
1b86826d | 5046 | alloc_profile = btrfs_metadata_alloc_profile(fs_info); |
72b468c8 | 5047 | ret = __btrfs_alloc_chunk(trans, chunk_offset, alloc_profile); |
79787eaa JM |
5048 | if (ret) |
5049 | return ret; | |
2b82032c | 5050 | |
0b246afa | 5051 | sys_chunk_offset = find_next_chunk(fs_info); |
1b86826d | 5052 | alloc_profile = btrfs_system_alloc_profile(fs_info); |
72b468c8 | 5053 | ret = __btrfs_alloc_chunk(trans, sys_chunk_offset, alloc_profile); |
79787eaa | 5054 | return ret; |
2b82032c YZ |
5055 | } |
5056 | ||
d20983b4 MX |
5057 | static inline int btrfs_chunk_max_errors(struct map_lookup *map) |
5058 | { | |
5059 | int max_errors; | |
5060 | ||
5061 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | | |
5062 | BTRFS_BLOCK_GROUP_RAID10 | | |
5063 | BTRFS_BLOCK_GROUP_RAID5 | | |
5064 | BTRFS_BLOCK_GROUP_DUP)) { | |
5065 | max_errors = 1; | |
5066 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID6) { | |
5067 | max_errors = 2; | |
5068 | } else { | |
5069 | max_errors = 0; | |
005d6427 | 5070 | } |
2b82032c | 5071 | |
d20983b4 | 5072 | return max_errors; |
2b82032c YZ |
5073 | } |
5074 | ||
2ff7e61e | 5075 | int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset) |
2b82032c YZ |
5076 | { |
5077 | struct extent_map *em; | |
5078 | struct map_lookup *map; | |
2b82032c | 5079 | int readonly = 0; |
d20983b4 | 5080 | int miss_ndevs = 0; |
2b82032c YZ |
5081 | int i; |
5082 | ||
592d92ee LB |
5083 | em = get_chunk_map(fs_info, chunk_offset, 1); |
5084 | if (IS_ERR(em)) | |
2b82032c YZ |
5085 | return 1; |
5086 | ||
95617d69 | 5087 | map = em->map_lookup; |
2b82032c | 5088 | for (i = 0; i < map->num_stripes; i++) { |
d20983b4 MX |
5089 | if (map->stripes[i].dev->missing) { |
5090 | miss_ndevs++; | |
5091 | continue; | |
5092 | } | |
5093 | ||
2b82032c YZ |
5094 | if (!map->stripes[i].dev->writeable) { |
5095 | readonly = 1; | |
d20983b4 | 5096 | goto end; |
2b82032c YZ |
5097 | } |
5098 | } | |
d20983b4 MX |
5099 | |
5100 | /* | |
5101 | * If the number of missing devices is larger than max errors, | |
5102 | * we can not write the data into that chunk successfully, so | |
5103 | * set it readonly. | |
5104 | */ | |
5105 | if (miss_ndevs > btrfs_chunk_max_errors(map)) | |
5106 | readonly = 1; | |
5107 | end: | |
0b86a832 | 5108 | free_extent_map(em); |
2b82032c | 5109 | return readonly; |
0b86a832 CM |
5110 | } |
5111 | ||
5112 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
5113 | { | |
a8067e02 | 5114 | extent_map_tree_init(&tree->map_tree); |
0b86a832 CM |
5115 | } |
5116 | ||
5117 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
5118 | { | |
5119 | struct extent_map *em; | |
5120 | ||
d397712b | 5121 | while (1) { |
890871be | 5122 | write_lock(&tree->map_tree.lock); |
0b86a832 CM |
5123 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
5124 | if (em) | |
5125 | remove_extent_mapping(&tree->map_tree, em); | |
890871be | 5126 | write_unlock(&tree->map_tree.lock); |
0b86a832 CM |
5127 | if (!em) |
5128 | break; | |
0b86a832 CM |
5129 | /* once for us */ |
5130 | free_extent_map(em); | |
5131 | /* once for the tree */ | |
5132 | free_extent_map(em); | |
5133 | } | |
5134 | } | |
5135 | ||
5d964051 | 5136 | int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len) |
f188591e CM |
5137 | { |
5138 | struct extent_map *em; | |
5139 | struct map_lookup *map; | |
f188591e CM |
5140 | int ret; |
5141 | ||
592d92ee LB |
5142 | em = get_chunk_map(fs_info, logical, len); |
5143 | if (IS_ERR(em)) | |
5144 | /* | |
5145 | * We could return errors for these cases, but that could get | |
5146 | * ugly and we'd probably do the same thing which is just not do | |
5147 | * anything else and exit, so return 1 so the callers don't try | |
5148 | * to use other copies. | |
5149 | */ | |
fb7669b5 | 5150 | return 1; |
fb7669b5 | 5151 | |
95617d69 | 5152 | map = em->map_lookup; |
f188591e CM |
5153 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) |
5154 | ret = map->num_stripes; | |
321aecc6 CM |
5155 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
5156 | ret = map->sub_stripes; | |
53b381b3 DW |
5157 | else if (map->type & BTRFS_BLOCK_GROUP_RAID5) |
5158 | ret = 2; | |
5159 | else if (map->type & BTRFS_BLOCK_GROUP_RAID6) | |
5160 | ret = 3; | |
f188591e CM |
5161 | else |
5162 | ret = 1; | |
5163 | free_extent_map(em); | |
ad6d620e | 5164 | |
73beece9 | 5165 | btrfs_dev_replace_lock(&fs_info->dev_replace, 0); |
6fad823f LB |
5166 | if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace) && |
5167 | fs_info->dev_replace.tgtdev) | |
ad6d620e | 5168 | ret++; |
73beece9 | 5169 | btrfs_dev_replace_unlock(&fs_info->dev_replace, 0); |
ad6d620e | 5170 | |
f188591e CM |
5171 | return ret; |
5172 | } | |
5173 | ||
2ff7e61e | 5174 | unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, |
53b381b3 DW |
5175 | struct btrfs_mapping_tree *map_tree, |
5176 | u64 logical) | |
5177 | { | |
5178 | struct extent_map *em; | |
5179 | struct map_lookup *map; | |
0b246afa | 5180 | unsigned long len = fs_info->sectorsize; |
53b381b3 | 5181 | |
592d92ee | 5182 | em = get_chunk_map(fs_info, logical, len); |
539b50d2 | 5183 | WARN_ON(IS_ERR(em)); |
53b381b3 | 5184 | |
95617d69 | 5185 | map = em->map_lookup; |
ffe2d203 | 5186 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 | 5187 | len = map->stripe_len * nr_data_stripes(map); |
53b381b3 DW |
5188 | free_extent_map(em); |
5189 | return len; | |
5190 | } | |
5191 | ||
592d92ee | 5192 | int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, |
53b381b3 DW |
5193 | u64 logical, u64 len, int mirror_num) |
5194 | { | |
5195 | struct extent_map *em; | |
5196 | struct map_lookup *map; | |
53b381b3 DW |
5197 | int ret = 0; |
5198 | ||
592d92ee | 5199 | em = get_chunk_map(fs_info, logical, len); |
539b50d2 | 5200 | WARN_ON(IS_ERR(em)); |
53b381b3 | 5201 | |
95617d69 | 5202 | map = em->map_lookup; |
ffe2d203 | 5203 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 DW |
5204 | ret = 1; |
5205 | free_extent_map(em); | |
5206 | return ret; | |
5207 | } | |
5208 | ||
30d9861f SB |
5209 | static int find_live_mirror(struct btrfs_fs_info *fs_info, |
5210 | struct map_lookup *map, int first, int num, | |
5211 | int optimal, int dev_replace_is_ongoing) | |
dfe25020 CM |
5212 | { |
5213 | int i; | |
30d9861f SB |
5214 | int tolerance; |
5215 | struct btrfs_device *srcdev; | |
5216 | ||
5217 | if (dev_replace_is_ongoing && | |
5218 | fs_info->dev_replace.cont_reading_from_srcdev_mode == | |
5219 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID) | |
5220 | srcdev = fs_info->dev_replace.srcdev; | |
5221 | else | |
5222 | srcdev = NULL; | |
5223 | ||
5224 | /* | |
5225 | * try to avoid the drive that is the source drive for a | |
5226 | * dev-replace procedure, only choose it if no other non-missing | |
5227 | * mirror is available | |
5228 | */ | |
5229 | for (tolerance = 0; tolerance < 2; tolerance++) { | |
5230 | if (map->stripes[optimal].dev->bdev && | |
5231 | (tolerance || map->stripes[optimal].dev != srcdev)) | |
5232 | return optimal; | |
5233 | for (i = first; i < first + num; i++) { | |
5234 | if (map->stripes[i].dev->bdev && | |
5235 | (tolerance || map->stripes[i].dev != srcdev)) | |
5236 | return i; | |
5237 | } | |
dfe25020 | 5238 | } |
30d9861f | 5239 | |
dfe25020 CM |
5240 | /* we couldn't find one that doesn't fail. Just return something |
5241 | * and the io error handling code will clean up eventually | |
5242 | */ | |
5243 | return optimal; | |
5244 | } | |
5245 | ||
53b381b3 DW |
5246 | static inline int parity_smaller(u64 a, u64 b) |
5247 | { | |
5248 | return a > b; | |
5249 | } | |
5250 | ||
5251 | /* Bubble-sort the stripe set to put the parity/syndrome stripes last */ | |
8e5cfb55 | 5252 | static void sort_parity_stripes(struct btrfs_bio *bbio, int num_stripes) |
53b381b3 DW |
5253 | { |
5254 | struct btrfs_bio_stripe s; | |
5255 | int i; | |
5256 | u64 l; | |
5257 | int again = 1; | |
5258 | ||
5259 | while (again) { | |
5260 | again = 0; | |
cc7539ed | 5261 | for (i = 0; i < num_stripes - 1; i++) { |
8e5cfb55 ZL |
5262 | if (parity_smaller(bbio->raid_map[i], |
5263 | bbio->raid_map[i+1])) { | |
53b381b3 | 5264 | s = bbio->stripes[i]; |
8e5cfb55 | 5265 | l = bbio->raid_map[i]; |
53b381b3 | 5266 | bbio->stripes[i] = bbio->stripes[i+1]; |
8e5cfb55 | 5267 | bbio->raid_map[i] = bbio->raid_map[i+1]; |
53b381b3 | 5268 | bbio->stripes[i+1] = s; |
8e5cfb55 | 5269 | bbio->raid_map[i+1] = l; |
2c8cdd6e | 5270 | |
53b381b3 DW |
5271 | again = 1; |
5272 | } | |
5273 | } | |
5274 | } | |
5275 | } | |
5276 | ||
6e9606d2 ZL |
5277 | static struct btrfs_bio *alloc_btrfs_bio(int total_stripes, int real_stripes) |
5278 | { | |
5279 | struct btrfs_bio *bbio = kzalloc( | |
e57cf21e | 5280 | /* the size of the btrfs_bio */ |
6e9606d2 | 5281 | sizeof(struct btrfs_bio) + |
e57cf21e | 5282 | /* plus the variable array for the stripes */ |
6e9606d2 | 5283 | sizeof(struct btrfs_bio_stripe) * (total_stripes) + |
e57cf21e | 5284 | /* plus the variable array for the tgt dev */ |
6e9606d2 | 5285 | sizeof(int) * (real_stripes) + |
e57cf21e CM |
5286 | /* |
5287 | * plus the raid_map, which includes both the tgt dev | |
5288 | * and the stripes | |
5289 | */ | |
5290 | sizeof(u64) * (total_stripes), | |
277fb5fc | 5291 | GFP_NOFS|__GFP_NOFAIL); |
6e9606d2 ZL |
5292 | |
5293 | atomic_set(&bbio->error, 0); | |
140475ae | 5294 | refcount_set(&bbio->refs, 1); |
6e9606d2 ZL |
5295 | |
5296 | return bbio; | |
5297 | } | |
5298 | ||
5299 | void btrfs_get_bbio(struct btrfs_bio *bbio) | |
5300 | { | |
140475ae ER |
5301 | WARN_ON(!refcount_read(&bbio->refs)); |
5302 | refcount_inc(&bbio->refs); | |
6e9606d2 ZL |
5303 | } |
5304 | ||
5305 | void btrfs_put_bbio(struct btrfs_bio *bbio) | |
5306 | { | |
5307 | if (!bbio) | |
5308 | return; | |
140475ae | 5309 | if (refcount_dec_and_test(&bbio->refs)) |
6e9606d2 ZL |
5310 | kfree(bbio); |
5311 | } | |
5312 | ||
0b3d4cd3 LB |
5313 | /* can REQ_OP_DISCARD be sent with other REQ like REQ_OP_WRITE? */ |
5314 | /* | |
5315 | * Please note that, discard won't be sent to target device of device | |
5316 | * replace. | |
5317 | */ | |
5318 | static int __btrfs_map_block_for_discard(struct btrfs_fs_info *fs_info, | |
5319 | u64 logical, u64 length, | |
5320 | struct btrfs_bio **bbio_ret) | |
5321 | { | |
5322 | struct extent_map *em; | |
5323 | struct map_lookup *map; | |
5324 | struct btrfs_bio *bbio; | |
5325 | u64 offset; | |
5326 | u64 stripe_nr; | |
5327 | u64 stripe_nr_end; | |
5328 | u64 stripe_end_offset; | |
5329 | u64 stripe_cnt; | |
5330 | u64 stripe_len; | |
5331 | u64 stripe_offset; | |
5332 | u64 num_stripes; | |
5333 | u32 stripe_index; | |
5334 | u32 factor = 0; | |
5335 | u32 sub_stripes = 0; | |
5336 | u64 stripes_per_dev = 0; | |
5337 | u32 remaining_stripes = 0; | |
5338 | u32 last_stripe = 0; | |
5339 | int ret = 0; | |
5340 | int i; | |
5341 | ||
5342 | /* discard always return a bbio */ | |
5343 | ASSERT(bbio_ret); | |
5344 | ||
5345 | em = get_chunk_map(fs_info, logical, length); | |
5346 | if (IS_ERR(em)) | |
5347 | return PTR_ERR(em); | |
5348 | ||
5349 | map = em->map_lookup; | |
5350 | /* we don't discard raid56 yet */ | |
5351 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { | |
5352 | ret = -EOPNOTSUPP; | |
5353 | goto out; | |
5354 | } | |
5355 | ||
5356 | offset = logical - em->start; | |
5357 | length = min_t(u64, em->len - offset, length); | |
5358 | ||
5359 | stripe_len = map->stripe_len; | |
5360 | /* | |
5361 | * stripe_nr counts the total number of stripes we have to stride | |
5362 | * to get to this block | |
5363 | */ | |
5364 | stripe_nr = div64_u64(offset, stripe_len); | |
5365 | ||
5366 | /* stripe_offset is the offset of this block in its stripe */ | |
5367 | stripe_offset = offset - stripe_nr * stripe_len; | |
5368 | ||
5369 | stripe_nr_end = round_up(offset + length, map->stripe_len); | |
42c61ab6 | 5370 | stripe_nr_end = div64_u64(stripe_nr_end, map->stripe_len); |
0b3d4cd3 LB |
5371 | stripe_cnt = stripe_nr_end - stripe_nr; |
5372 | stripe_end_offset = stripe_nr_end * map->stripe_len - | |
5373 | (offset + length); | |
5374 | /* | |
5375 | * after this, stripe_nr is the number of stripes on this | |
5376 | * device we have to walk to find the data, and stripe_index is | |
5377 | * the number of our device in the stripe array | |
5378 | */ | |
5379 | num_stripes = 1; | |
5380 | stripe_index = 0; | |
5381 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | | |
5382 | BTRFS_BLOCK_GROUP_RAID10)) { | |
5383 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
5384 | sub_stripes = 1; | |
5385 | else | |
5386 | sub_stripes = map->sub_stripes; | |
5387 | ||
5388 | factor = map->num_stripes / sub_stripes; | |
5389 | num_stripes = min_t(u64, map->num_stripes, | |
5390 | sub_stripes * stripe_cnt); | |
5391 | stripe_nr = div_u64_rem(stripe_nr, factor, &stripe_index); | |
5392 | stripe_index *= sub_stripes; | |
5393 | stripes_per_dev = div_u64_rem(stripe_cnt, factor, | |
5394 | &remaining_stripes); | |
5395 | div_u64_rem(stripe_nr_end - 1, factor, &last_stripe); | |
5396 | last_stripe *= sub_stripes; | |
5397 | } else if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | | |
5398 | BTRFS_BLOCK_GROUP_DUP)) { | |
5399 | num_stripes = map->num_stripes; | |
5400 | } else { | |
5401 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, | |
5402 | &stripe_index); | |
5403 | } | |
5404 | ||
5405 | bbio = alloc_btrfs_bio(num_stripes, 0); | |
5406 | if (!bbio) { | |
5407 | ret = -ENOMEM; | |
5408 | goto out; | |
5409 | } | |
5410 | ||
5411 | for (i = 0; i < num_stripes; i++) { | |
5412 | bbio->stripes[i].physical = | |
5413 | map->stripes[stripe_index].physical + | |
5414 | stripe_offset + stripe_nr * map->stripe_len; | |
5415 | bbio->stripes[i].dev = map->stripes[stripe_index].dev; | |
5416 | ||
5417 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | | |
5418 | BTRFS_BLOCK_GROUP_RAID10)) { | |
5419 | bbio->stripes[i].length = stripes_per_dev * | |
5420 | map->stripe_len; | |
5421 | ||
5422 | if (i / sub_stripes < remaining_stripes) | |
5423 | bbio->stripes[i].length += | |
5424 | map->stripe_len; | |
5425 | ||
5426 | /* | |
5427 | * Special for the first stripe and | |
5428 | * the last stripe: | |
5429 | * | |
5430 | * |-------|...|-------| | |
5431 | * |----------| | |
5432 | * off end_off | |
5433 | */ | |
5434 | if (i < sub_stripes) | |
5435 | bbio->stripes[i].length -= | |
5436 | stripe_offset; | |
5437 | ||
5438 | if (stripe_index >= last_stripe && | |
5439 | stripe_index <= (last_stripe + | |
5440 | sub_stripes - 1)) | |
5441 | bbio->stripes[i].length -= | |
5442 | stripe_end_offset; | |
5443 | ||
5444 | if (i == sub_stripes - 1) | |
5445 | stripe_offset = 0; | |
5446 | } else { | |
5447 | bbio->stripes[i].length = length; | |
5448 | } | |
5449 | ||
5450 | stripe_index++; | |
5451 | if (stripe_index == map->num_stripes) { | |
5452 | stripe_index = 0; | |
5453 | stripe_nr++; | |
5454 | } | |
5455 | } | |
5456 | ||
5457 | *bbio_ret = bbio; | |
5458 | bbio->map_type = map->type; | |
5459 | bbio->num_stripes = num_stripes; | |
5460 | out: | |
5461 | free_extent_map(em); | |
5462 | return ret; | |
5463 | } | |
5464 | ||
5ab56090 LB |
5465 | /* |
5466 | * In dev-replace case, for repair case (that's the only case where the mirror | |
5467 | * is selected explicitly when calling btrfs_map_block), blocks left of the | |
5468 | * left cursor can also be read from the target drive. | |
5469 | * | |
5470 | * For REQ_GET_READ_MIRRORS, the target drive is added as the last one to the | |
5471 | * array of stripes. | |
5472 | * For READ, it also needs to be supported using the same mirror number. | |
5473 | * | |
5474 | * If the requested block is not left of the left cursor, EIO is returned. This | |
5475 | * can happen because btrfs_num_copies() returns one more in the dev-replace | |
5476 | * case. | |
5477 | */ | |
5478 | static int get_extra_mirror_from_replace(struct btrfs_fs_info *fs_info, | |
5479 | u64 logical, u64 length, | |
5480 | u64 srcdev_devid, int *mirror_num, | |
5481 | u64 *physical) | |
5482 | { | |
5483 | struct btrfs_bio *bbio = NULL; | |
5484 | int num_stripes; | |
5485 | int index_srcdev = 0; | |
5486 | int found = 0; | |
5487 | u64 physical_of_found = 0; | |
5488 | int i; | |
5489 | int ret = 0; | |
5490 | ||
5491 | ret = __btrfs_map_block(fs_info, BTRFS_MAP_GET_READ_MIRRORS, | |
5492 | logical, &length, &bbio, 0, 0); | |
5493 | if (ret) { | |
5494 | ASSERT(bbio == NULL); | |
5495 | return ret; | |
5496 | } | |
5497 | ||
5498 | num_stripes = bbio->num_stripes; | |
5499 | if (*mirror_num > num_stripes) { | |
5500 | /* | |
5501 | * BTRFS_MAP_GET_READ_MIRRORS does not contain this mirror, | |
5502 | * that means that the requested area is not left of the left | |
5503 | * cursor | |
5504 | */ | |
5505 | btrfs_put_bbio(bbio); | |
5506 | return -EIO; | |
5507 | } | |
5508 | ||
5509 | /* | |
5510 | * process the rest of the function using the mirror_num of the source | |
5511 | * drive. Therefore look it up first. At the end, patch the device | |
5512 | * pointer to the one of the target drive. | |
5513 | */ | |
5514 | for (i = 0; i < num_stripes; i++) { | |
5515 | if (bbio->stripes[i].dev->devid != srcdev_devid) | |
5516 | continue; | |
5517 | ||
5518 | /* | |
5519 | * In case of DUP, in order to keep it simple, only add the | |
5520 | * mirror with the lowest physical address | |
5521 | */ | |
5522 | if (found && | |
5523 | physical_of_found <= bbio->stripes[i].physical) | |
5524 | continue; | |
5525 | ||
5526 | index_srcdev = i; | |
5527 | found = 1; | |
5528 | physical_of_found = bbio->stripes[i].physical; | |
5529 | } | |
5530 | ||
5531 | btrfs_put_bbio(bbio); | |
5532 | ||
5533 | ASSERT(found); | |
5534 | if (!found) | |
5535 | return -EIO; | |
5536 | ||
5537 | *mirror_num = index_srcdev + 1; | |
5538 | *physical = physical_of_found; | |
5539 | return ret; | |
5540 | } | |
5541 | ||
73c0f228 LB |
5542 | static void handle_ops_on_dev_replace(enum btrfs_map_op op, |
5543 | struct btrfs_bio **bbio_ret, | |
5544 | struct btrfs_dev_replace *dev_replace, | |
5545 | int *num_stripes_ret, int *max_errors_ret) | |
5546 | { | |
5547 | struct btrfs_bio *bbio = *bbio_ret; | |
5548 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
5549 | int tgtdev_indexes = 0; | |
5550 | int num_stripes = *num_stripes_ret; | |
5551 | int max_errors = *max_errors_ret; | |
5552 | int i; | |
5553 | ||
5554 | if (op == BTRFS_MAP_WRITE) { | |
5555 | int index_where_to_add; | |
5556 | ||
5557 | /* | |
5558 | * duplicate the write operations while the dev replace | |
5559 | * procedure is running. Since the copying of the old disk to | |
5560 | * the new disk takes place at run time while the filesystem is | |
5561 | * mounted writable, the regular write operations to the old | |
5562 | * disk have to be duplicated to go to the new disk as well. | |
5563 | * | |
5564 | * Note that device->missing is handled by the caller, and that | |
5565 | * the write to the old disk is already set up in the stripes | |
5566 | * array. | |
5567 | */ | |
5568 | index_where_to_add = num_stripes; | |
5569 | for (i = 0; i < num_stripes; i++) { | |
5570 | if (bbio->stripes[i].dev->devid == srcdev_devid) { | |
5571 | /* write to new disk, too */ | |
5572 | struct btrfs_bio_stripe *new = | |
5573 | bbio->stripes + index_where_to_add; | |
5574 | struct btrfs_bio_stripe *old = | |
5575 | bbio->stripes + i; | |
5576 | ||
5577 | new->physical = old->physical; | |
5578 | new->length = old->length; | |
5579 | new->dev = dev_replace->tgtdev; | |
5580 | bbio->tgtdev_map[i] = index_where_to_add; | |
5581 | index_where_to_add++; | |
5582 | max_errors++; | |
5583 | tgtdev_indexes++; | |
5584 | } | |
5585 | } | |
5586 | num_stripes = index_where_to_add; | |
5587 | } else if (op == BTRFS_MAP_GET_READ_MIRRORS) { | |
5588 | int index_srcdev = 0; | |
5589 | int found = 0; | |
5590 | u64 physical_of_found = 0; | |
5591 | ||
5592 | /* | |
5593 | * During the dev-replace procedure, the target drive can also | |
5594 | * be used to read data in case it is needed to repair a corrupt | |
5595 | * block elsewhere. This is possible if the requested area is | |
5596 | * left of the left cursor. In this area, the target drive is a | |
5597 | * full copy of the source drive. | |
5598 | */ | |
5599 | for (i = 0; i < num_stripes; i++) { | |
5600 | if (bbio->stripes[i].dev->devid == srcdev_devid) { | |
5601 | /* | |
5602 | * In case of DUP, in order to keep it simple, | |
5603 | * only add the mirror with the lowest physical | |
5604 | * address | |
5605 | */ | |
5606 | if (found && | |
5607 | physical_of_found <= | |
5608 | bbio->stripes[i].physical) | |
5609 | continue; | |
5610 | index_srcdev = i; | |
5611 | found = 1; | |
5612 | physical_of_found = bbio->stripes[i].physical; | |
5613 | } | |
5614 | } | |
5615 | if (found) { | |
5616 | struct btrfs_bio_stripe *tgtdev_stripe = | |
5617 | bbio->stripes + num_stripes; | |
5618 | ||
5619 | tgtdev_stripe->physical = physical_of_found; | |
5620 | tgtdev_stripe->length = | |
5621 | bbio->stripes[index_srcdev].length; | |
5622 | tgtdev_stripe->dev = dev_replace->tgtdev; | |
5623 | bbio->tgtdev_map[index_srcdev] = num_stripes; | |
5624 | ||
5625 | tgtdev_indexes++; | |
5626 | num_stripes++; | |
5627 | } | |
5628 | } | |
5629 | ||
5630 | *num_stripes_ret = num_stripes; | |
5631 | *max_errors_ret = max_errors; | |
5632 | bbio->num_tgtdevs = tgtdev_indexes; | |
5633 | *bbio_ret = bbio; | |
5634 | } | |
5635 | ||
2b19a1fe LB |
5636 | static bool need_full_stripe(enum btrfs_map_op op) |
5637 | { | |
5638 | return (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS); | |
5639 | } | |
5640 | ||
cf8cddd3 CH |
5641 | static int __btrfs_map_block(struct btrfs_fs_info *fs_info, |
5642 | enum btrfs_map_op op, | |
f2d8d74d | 5643 | u64 logical, u64 *length, |
a1d3c478 | 5644 | struct btrfs_bio **bbio_ret, |
8e5cfb55 | 5645 | int mirror_num, int need_raid_map) |
0b86a832 CM |
5646 | { |
5647 | struct extent_map *em; | |
5648 | struct map_lookup *map; | |
0b86a832 | 5649 | u64 offset; |
593060d7 CM |
5650 | u64 stripe_offset; |
5651 | u64 stripe_nr; | |
53b381b3 | 5652 | u64 stripe_len; |
9d644a62 | 5653 | u32 stripe_index; |
cea9e445 | 5654 | int i; |
de11cc12 | 5655 | int ret = 0; |
f2d8d74d | 5656 | int num_stripes; |
a236aed1 | 5657 | int max_errors = 0; |
2c8cdd6e | 5658 | int tgtdev_indexes = 0; |
a1d3c478 | 5659 | struct btrfs_bio *bbio = NULL; |
472262f3 SB |
5660 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
5661 | int dev_replace_is_ongoing = 0; | |
5662 | int num_alloc_stripes; | |
ad6d620e SB |
5663 | int patch_the_first_stripe_for_dev_replace = 0; |
5664 | u64 physical_to_patch_in_first_stripe = 0; | |
53b381b3 | 5665 | u64 raid56_full_stripe_start = (u64)-1; |
0b86a832 | 5666 | |
0b3d4cd3 LB |
5667 | if (op == BTRFS_MAP_DISCARD) |
5668 | return __btrfs_map_block_for_discard(fs_info, logical, | |
5669 | *length, bbio_ret); | |
5670 | ||
592d92ee LB |
5671 | em = get_chunk_map(fs_info, logical, *length); |
5672 | if (IS_ERR(em)) | |
5673 | return PTR_ERR(em); | |
0b86a832 | 5674 | |
95617d69 | 5675 | map = em->map_lookup; |
0b86a832 | 5676 | offset = logical - em->start; |
593060d7 | 5677 | |
53b381b3 | 5678 | stripe_len = map->stripe_len; |
593060d7 CM |
5679 | stripe_nr = offset; |
5680 | /* | |
5681 | * stripe_nr counts the total number of stripes we have to stride | |
5682 | * to get to this block | |
5683 | */ | |
47c5713f | 5684 | stripe_nr = div64_u64(stripe_nr, stripe_len); |
593060d7 | 5685 | |
53b381b3 | 5686 | stripe_offset = stripe_nr * stripe_len; |
e042d1ec | 5687 | if (offset < stripe_offset) { |
5d163e0e JM |
5688 | btrfs_crit(fs_info, |
5689 | "stripe math has gone wrong, stripe_offset=%llu, offset=%llu, start=%llu, logical=%llu, stripe_len=%llu", | |
e042d1ec JB |
5690 | stripe_offset, offset, em->start, logical, |
5691 | stripe_len); | |
5692 | free_extent_map(em); | |
5693 | return -EINVAL; | |
5694 | } | |
593060d7 CM |
5695 | |
5696 | /* stripe_offset is the offset of this block in its stripe*/ | |
5697 | stripe_offset = offset - stripe_offset; | |
5698 | ||
53b381b3 | 5699 | /* if we're here for raid56, we need to know the stripe aligned start */ |
ffe2d203 | 5700 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
53b381b3 DW |
5701 | unsigned long full_stripe_len = stripe_len * nr_data_stripes(map); |
5702 | raid56_full_stripe_start = offset; | |
5703 | ||
5704 | /* allow a write of a full stripe, but make sure we don't | |
5705 | * allow straddling of stripes | |
5706 | */ | |
47c5713f DS |
5707 | raid56_full_stripe_start = div64_u64(raid56_full_stripe_start, |
5708 | full_stripe_len); | |
53b381b3 DW |
5709 | raid56_full_stripe_start *= full_stripe_len; |
5710 | } | |
5711 | ||
0b3d4cd3 | 5712 | if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) { |
53b381b3 DW |
5713 | u64 max_len; |
5714 | /* For writes to RAID[56], allow a full stripeset across all disks. | |
5715 | For other RAID types and for RAID[56] reads, just allow a single | |
5716 | stripe (on a single disk). */ | |
ffe2d203 | 5717 | if ((map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) && |
cf8cddd3 | 5718 | (op == BTRFS_MAP_WRITE)) { |
53b381b3 DW |
5719 | max_len = stripe_len * nr_data_stripes(map) - |
5720 | (offset - raid56_full_stripe_start); | |
5721 | } else { | |
5722 | /* we limit the length of each bio to what fits in a stripe */ | |
5723 | max_len = stripe_len - stripe_offset; | |
5724 | } | |
5725 | *length = min_t(u64, em->len - offset, max_len); | |
cea9e445 CM |
5726 | } else { |
5727 | *length = em->len - offset; | |
5728 | } | |
f2d8d74d | 5729 | |
53b381b3 DW |
5730 | /* This is for when we're called from btrfs_merge_bio_hook() and all |
5731 | it cares about is the length */ | |
a1d3c478 | 5732 | if (!bbio_ret) |
cea9e445 CM |
5733 | goto out; |
5734 | ||
73beece9 | 5735 | btrfs_dev_replace_lock(dev_replace, 0); |
472262f3 SB |
5736 | dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace); |
5737 | if (!dev_replace_is_ongoing) | |
73beece9 LB |
5738 | btrfs_dev_replace_unlock(dev_replace, 0); |
5739 | else | |
5740 | btrfs_dev_replace_set_lock_blocking(dev_replace); | |
472262f3 | 5741 | |
ad6d620e | 5742 | if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 && |
2b19a1fe | 5743 | !need_full_stripe(op) && dev_replace->tgtdev != NULL) { |
5ab56090 LB |
5744 | ret = get_extra_mirror_from_replace(fs_info, logical, *length, |
5745 | dev_replace->srcdev->devid, | |
5746 | &mirror_num, | |
5747 | &physical_to_patch_in_first_stripe); | |
5748 | if (ret) | |
ad6d620e | 5749 | goto out; |
5ab56090 LB |
5750 | else |
5751 | patch_the_first_stripe_for_dev_replace = 1; | |
ad6d620e SB |
5752 | } else if (mirror_num > map->num_stripes) { |
5753 | mirror_num = 0; | |
5754 | } | |
5755 | ||
f2d8d74d | 5756 | num_stripes = 1; |
cea9e445 | 5757 | stripe_index = 0; |
fce3bb9a | 5758 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
47c5713f DS |
5759 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, |
5760 | &stripe_index); | |
0b3d4cd3 | 5761 | if (op != BTRFS_MAP_WRITE && op != BTRFS_MAP_GET_READ_MIRRORS) |
28e1cc7d | 5762 | mirror_num = 1; |
fce3bb9a | 5763 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
0b3d4cd3 | 5764 | if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS) |
f2d8d74d | 5765 | num_stripes = map->num_stripes; |
2fff734f | 5766 | else if (mirror_num) |
f188591e | 5767 | stripe_index = mirror_num - 1; |
dfe25020 | 5768 | else { |
30d9861f | 5769 | stripe_index = find_live_mirror(fs_info, map, 0, |
dfe25020 | 5770 | map->num_stripes, |
30d9861f SB |
5771 | current->pid % map->num_stripes, |
5772 | dev_replace_is_ongoing); | |
a1d3c478 | 5773 | mirror_num = stripe_index + 1; |
dfe25020 | 5774 | } |
2fff734f | 5775 | |
611f0e00 | 5776 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
0b3d4cd3 | 5777 | if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS) { |
f2d8d74d | 5778 | num_stripes = map->num_stripes; |
a1d3c478 | 5779 | } else if (mirror_num) { |
f188591e | 5780 | stripe_index = mirror_num - 1; |
a1d3c478 JS |
5781 | } else { |
5782 | mirror_num = 1; | |
5783 | } | |
2fff734f | 5784 | |
321aecc6 | 5785 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
9d644a62 | 5786 | u32 factor = map->num_stripes / map->sub_stripes; |
321aecc6 | 5787 | |
47c5713f | 5788 | stripe_nr = div_u64_rem(stripe_nr, factor, &stripe_index); |
321aecc6 CM |
5789 | stripe_index *= map->sub_stripes; |
5790 | ||
cf8cddd3 | 5791 | if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS) |
f2d8d74d | 5792 | num_stripes = map->sub_stripes; |
321aecc6 CM |
5793 | else if (mirror_num) |
5794 | stripe_index += mirror_num - 1; | |
dfe25020 | 5795 | else { |
3e74317a | 5796 | int old_stripe_index = stripe_index; |
30d9861f SB |
5797 | stripe_index = find_live_mirror(fs_info, map, |
5798 | stripe_index, | |
dfe25020 | 5799 | map->sub_stripes, stripe_index + |
30d9861f SB |
5800 | current->pid % map->sub_stripes, |
5801 | dev_replace_is_ongoing); | |
3e74317a | 5802 | mirror_num = stripe_index - old_stripe_index + 1; |
dfe25020 | 5803 | } |
53b381b3 | 5804 | |
ffe2d203 | 5805 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
8e5cfb55 | 5806 | if (need_raid_map && |
cf8cddd3 | 5807 | (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS || |
af8e2d1d | 5808 | mirror_num > 1)) { |
53b381b3 | 5809 | /* push stripe_nr back to the start of the full stripe */ |
42c61ab6 | 5810 | stripe_nr = div64_u64(raid56_full_stripe_start, |
b8b93add | 5811 | stripe_len * nr_data_stripes(map)); |
53b381b3 DW |
5812 | |
5813 | /* RAID[56] write or recovery. Return all stripes */ | |
5814 | num_stripes = map->num_stripes; | |
5815 | max_errors = nr_parity_stripes(map); | |
5816 | ||
53b381b3 DW |
5817 | *length = map->stripe_len; |
5818 | stripe_index = 0; | |
5819 | stripe_offset = 0; | |
5820 | } else { | |
5821 | /* | |
5822 | * Mirror #0 or #1 means the original data block. | |
5823 | * Mirror #2 is RAID5 parity block. | |
5824 | * Mirror #3 is RAID6 Q block. | |
5825 | */ | |
47c5713f DS |
5826 | stripe_nr = div_u64_rem(stripe_nr, |
5827 | nr_data_stripes(map), &stripe_index); | |
53b381b3 DW |
5828 | if (mirror_num > 1) |
5829 | stripe_index = nr_data_stripes(map) + | |
5830 | mirror_num - 2; | |
5831 | ||
5832 | /* We distribute the parity blocks across stripes */ | |
47c5713f DS |
5833 | div_u64_rem(stripe_nr + stripe_index, map->num_stripes, |
5834 | &stripe_index); | |
0b3d4cd3 LB |
5835 | if ((op != BTRFS_MAP_WRITE && |
5836 | op != BTRFS_MAP_GET_READ_MIRRORS) && | |
5837 | mirror_num <= 1) | |
28e1cc7d | 5838 | mirror_num = 1; |
53b381b3 | 5839 | } |
8790d502 CM |
5840 | } else { |
5841 | /* | |
47c5713f DS |
5842 | * after this, stripe_nr is the number of stripes on this |
5843 | * device we have to walk to find the data, and stripe_index is | |
5844 | * the number of our device in the stripe array | |
8790d502 | 5845 | */ |
47c5713f DS |
5846 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, |
5847 | &stripe_index); | |
a1d3c478 | 5848 | mirror_num = stripe_index + 1; |
8790d502 | 5849 | } |
e042d1ec | 5850 | if (stripe_index >= map->num_stripes) { |
5d163e0e JM |
5851 | btrfs_crit(fs_info, |
5852 | "stripe index math went horribly wrong, got stripe_index=%u, num_stripes=%u", | |
e042d1ec JB |
5853 | stripe_index, map->num_stripes); |
5854 | ret = -EINVAL; | |
5855 | goto out; | |
5856 | } | |
cea9e445 | 5857 | |
472262f3 | 5858 | num_alloc_stripes = num_stripes; |
6fad823f | 5859 | if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL) { |
0b3d4cd3 | 5860 | if (op == BTRFS_MAP_WRITE) |
ad6d620e | 5861 | num_alloc_stripes <<= 1; |
cf8cddd3 | 5862 | if (op == BTRFS_MAP_GET_READ_MIRRORS) |
ad6d620e | 5863 | num_alloc_stripes++; |
2c8cdd6e | 5864 | tgtdev_indexes = num_stripes; |
ad6d620e | 5865 | } |
2c8cdd6e | 5866 | |
6e9606d2 | 5867 | bbio = alloc_btrfs_bio(num_alloc_stripes, tgtdev_indexes); |
de11cc12 LZ |
5868 | if (!bbio) { |
5869 | ret = -ENOMEM; | |
5870 | goto out; | |
5871 | } | |
6fad823f | 5872 | if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL) |
2c8cdd6e | 5873 | bbio->tgtdev_map = (int *)(bbio->stripes + num_alloc_stripes); |
de11cc12 | 5874 | |
8e5cfb55 | 5875 | /* build raid_map */ |
2b19a1fe LB |
5876 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK && need_raid_map && |
5877 | (need_full_stripe(op) || mirror_num > 1)) { | |
8e5cfb55 | 5878 | u64 tmp; |
9d644a62 | 5879 | unsigned rot; |
8e5cfb55 ZL |
5880 | |
5881 | bbio->raid_map = (u64 *)((void *)bbio->stripes + | |
5882 | sizeof(struct btrfs_bio_stripe) * | |
5883 | num_alloc_stripes + | |
5884 | sizeof(int) * tgtdev_indexes); | |
5885 | ||
5886 | /* Work out the disk rotation on this stripe-set */ | |
47c5713f | 5887 | div_u64_rem(stripe_nr, num_stripes, &rot); |
8e5cfb55 ZL |
5888 | |
5889 | /* Fill in the logical address of each stripe */ | |
5890 | tmp = stripe_nr * nr_data_stripes(map); | |
5891 | for (i = 0; i < nr_data_stripes(map); i++) | |
5892 | bbio->raid_map[(i+rot) % num_stripes] = | |
5893 | em->start + (tmp + i) * map->stripe_len; | |
5894 | ||
5895 | bbio->raid_map[(i+rot) % map->num_stripes] = RAID5_P_STRIPE; | |
5896 | if (map->type & BTRFS_BLOCK_GROUP_RAID6) | |
5897 | bbio->raid_map[(i+rot+1) % num_stripes] = | |
5898 | RAID6_Q_STRIPE; | |
5899 | } | |
5900 | ||
b89203f7 | 5901 | |
0b3d4cd3 LB |
5902 | for (i = 0; i < num_stripes; i++) { |
5903 | bbio->stripes[i].physical = | |
5904 | map->stripes[stripe_index].physical + | |
5905 | stripe_offset + | |
5906 | stripe_nr * map->stripe_len; | |
5907 | bbio->stripes[i].dev = | |
5908 | map->stripes[stripe_index].dev; | |
5909 | stripe_index++; | |
593060d7 | 5910 | } |
de11cc12 | 5911 | |
2b19a1fe | 5912 | if (need_full_stripe(op)) |
d20983b4 | 5913 | max_errors = btrfs_chunk_max_errors(map); |
de11cc12 | 5914 | |
8e5cfb55 ZL |
5915 | if (bbio->raid_map) |
5916 | sort_parity_stripes(bbio, num_stripes); | |
cc7539ed | 5917 | |
73c0f228 | 5918 | if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL && |
2b19a1fe | 5919 | need_full_stripe(op)) { |
73c0f228 LB |
5920 | handle_ops_on_dev_replace(op, &bbio, dev_replace, &num_stripes, |
5921 | &max_errors); | |
472262f3 SB |
5922 | } |
5923 | ||
de11cc12 | 5924 | *bbio_ret = bbio; |
10f11900 | 5925 | bbio->map_type = map->type; |
de11cc12 LZ |
5926 | bbio->num_stripes = num_stripes; |
5927 | bbio->max_errors = max_errors; | |
5928 | bbio->mirror_num = mirror_num; | |
ad6d620e SB |
5929 | |
5930 | /* | |
5931 | * this is the case that REQ_READ && dev_replace_is_ongoing && | |
5932 | * mirror_num == num_stripes + 1 && dev_replace target drive is | |
5933 | * available as a mirror | |
5934 | */ | |
5935 | if (patch_the_first_stripe_for_dev_replace && num_stripes > 0) { | |
5936 | WARN_ON(num_stripes > 1); | |
5937 | bbio->stripes[0].dev = dev_replace->tgtdev; | |
5938 | bbio->stripes[0].physical = physical_to_patch_in_first_stripe; | |
5939 | bbio->mirror_num = map->num_stripes + 1; | |
5940 | } | |
cea9e445 | 5941 | out: |
73beece9 LB |
5942 | if (dev_replace_is_ongoing) { |
5943 | btrfs_dev_replace_clear_lock_blocking(dev_replace); | |
5944 | btrfs_dev_replace_unlock(dev_replace, 0); | |
5945 | } | |
0b86a832 | 5946 | free_extent_map(em); |
de11cc12 | 5947 | return ret; |
0b86a832 CM |
5948 | } |
5949 | ||
cf8cddd3 | 5950 | int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, |
f2d8d74d | 5951 | u64 logical, u64 *length, |
a1d3c478 | 5952 | struct btrfs_bio **bbio_ret, int mirror_num) |
f2d8d74d | 5953 | { |
b3d3fa51 | 5954 | return __btrfs_map_block(fs_info, op, logical, length, bbio_ret, |
8e5cfb55 | 5955 | mirror_num, 0); |
f2d8d74d CM |
5956 | } |
5957 | ||
af8e2d1d | 5958 | /* For Scrub/replace */ |
cf8cddd3 | 5959 | int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, |
af8e2d1d | 5960 | u64 logical, u64 *length, |
825ad4c9 | 5961 | struct btrfs_bio **bbio_ret) |
af8e2d1d | 5962 | { |
825ad4c9 | 5963 | return __btrfs_map_block(fs_info, op, logical, length, bbio_ret, 0, 1); |
af8e2d1d MX |
5964 | } |
5965 | ||
ab8d0fc4 | 5966 | int btrfs_rmap_block(struct btrfs_fs_info *fs_info, |
a512bbf8 YZ |
5967 | u64 chunk_start, u64 physical, u64 devid, |
5968 | u64 **logical, int *naddrs, int *stripe_len) | |
5969 | { | |
a512bbf8 YZ |
5970 | struct extent_map *em; |
5971 | struct map_lookup *map; | |
5972 | u64 *buf; | |
5973 | u64 bytenr; | |
5974 | u64 length; | |
5975 | u64 stripe_nr; | |
53b381b3 | 5976 | u64 rmap_len; |
a512bbf8 YZ |
5977 | int i, j, nr = 0; |
5978 | ||
592d92ee LB |
5979 | em = get_chunk_map(fs_info, chunk_start, 1); |
5980 | if (IS_ERR(em)) | |
835d974f | 5981 | return -EIO; |
835d974f | 5982 | |
95617d69 | 5983 | map = em->map_lookup; |
a512bbf8 | 5984 | length = em->len; |
53b381b3 DW |
5985 | rmap_len = map->stripe_len; |
5986 | ||
a512bbf8 | 5987 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
b8b93add | 5988 | length = div_u64(length, map->num_stripes / map->sub_stripes); |
a512bbf8 | 5989 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) |
b8b93add | 5990 | length = div_u64(length, map->num_stripes); |
ffe2d203 | 5991 | else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
b8b93add | 5992 | length = div_u64(length, nr_data_stripes(map)); |
53b381b3 DW |
5993 | rmap_len = map->stripe_len * nr_data_stripes(map); |
5994 | } | |
a512bbf8 | 5995 | |
31e818fe | 5996 | buf = kcalloc(map->num_stripes, sizeof(u64), GFP_NOFS); |
79787eaa | 5997 | BUG_ON(!buf); /* -ENOMEM */ |
a512bbf8 YZ |
5998 | |
5999 | for (i = 0; i < map->num_stripes; i++) { | |
6000 | if (devid && map->stripes[i].dev->devid != devid) | |
6001 | continue; | |
6002 | if (map->stripes[i].physical > physical || | |
6003 | map->stripes[i].physical + length <= physical) | |
6004 | continue; | |
6005 | ||
6006 | stripe_nr = physical - map->stripes[i].physical; | |
42c61ab6 | 6007 | stripe_nr = div64_u64(stripe_nr, map->stripe_len); |
a512bbf8 YZ |
6008 | |
6009 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
6010 | stripe_nr = stripe_nr * map->num_stripes + i; | |
b8b93add | 6011 | stripe_nr = div_u64(stripe_nr, map->sub_stripes); |
a512bbf8 YZ |
6012 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
6013 | stripe_nr = stripe_nr * map->num_stripes + i; | |
53b381b3 DW |
6014 | } /* else if RAID[56], multiply by nr_data_stripes(). |
6015 | * Alternatively, just use rmap_len below instead of | |
6016 | * map->stripe_len */ | |
6017 | ||
6018 | bytenr = chunk_start + stripe_nr * rmap_len; | |
934d375b | 6019 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
6020 | for (j = 0; j < nr; j++) { |
6021 | if (buf[j] == bytenr) | |
6022 | break; | |
6023 | } | |
934d375b CM |
6024 | if (j == nr) { |
6025 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 6026 | buf[nr++] = bytenr; |
934d375b | 6027 | } |
a512bbf8 YZ |
6028 | } |
6029 | ||
a512bbf8 YZ |
6030 | *logical = buf; |
6031 | *naddrs = nr; | |
53b381b3 | 6032 | *stripe_len = rmap_len; |
a512bbf8 YZ |
6033 | |
6034 | free_extent_map(em); | |
6035 | return 0; | |
f2d8d74d CM |
6036 | } |
6037 | ||
4246a0b6 | 6038 | static inline void btrfs_end_bbio(struct btrfs_bio *bbio, struct bio *bio) |
8408c716 | 6039 | { |
326e1dbb MS |
6040 | bio->bi_private = bbio->private; |
6041 | bio->bi_end_io = bbio->end_io; | |
4246a0b6 | 6042 | bio_endio(bio); |
326e1dbb | 6043 | |
6e9606d2 | 6044 | btrfs_put_bbio(bbio); |
8408c716 MX |
6045 | } |
6046 | ||
4246a0b6 | 6047 | static void btrfs_end_bio(struct bio *bio) |
8790d502 | 6048 | { |
9be3395b | 6049 | struct btrfs_bio *bbio = bio->bi_private; |
7d2b4daa | 6050 | int is_orig_bio = 0; |
8790d502 | 6051 | |
4e4cbee9 | 6052 | if (bio->bi_status) { |
a1d3c478 | 6053 | atomic_inc(&bbio->error); |
4e4cbee9 CH |
6054 | if (bio->bi_status == BLK_STS_IOERR || |
6055 | bio->bi_status == BLK_STS_TARGET) { | |
442a4f63 | 6056 | unsigned int stripe_index = |
9be3395b | 6057 | btrfs_io_bio(bio)->stripe_index; |
65f53338 | 6058 | struct btrfs_device *dev; |
442a4f63 SB |
6059 | |
6060 | BUG_ON(stripe_index >= bbio->num_stripes); | |
6061 | dev = bbio->stripes[stripe_index].dev; | |
597a60fa | 6062 | if (dev->bdev) { |
37226b21 | 6063 | if (bio_op(bio) == REQ_OP_WRITE) |
597a60fa SB |
6064 | btrfs_dev_stat_inc(dev, |
6065 | BTRFS_DEV_STAT_WRITE_ERRS); | |
6066 | else | |
6067 | btrfs_dev_stat_inc(dev, | |
6068 | BTRFS_DEV_STAT_READ_ERRS); | |
70fd7614 | 6069 | if (bio->bi_opf & REQ_PREFLUSH) |
597a60fa SB |
6070 | btrfs_dev_stat_inc(dev, |
6071 | BTRFS_DEV_STAT_FLUSH_ERRS); | |
6072 | btrfs_dev_stat_print_on_error(dev); | |
6073 | } | |
442a4f63 SB |
6074 | } |
6075 | } | |
8790d502 | 6076 | |
a1d3c478 | 6077 | if (bio == bbio->orig_bio) |
7d2b4daa CM |
6078 | is_orig_bio = 1; |
6079 | ||
c404e0dc MX |
6080 | btrfs_bio_counter_dec(bbio->fs_info); |
6081 | ||
a1d3c478 | 6082 | if (atomic_dec_and_test(&bbio->stripes_pending)) { |
7d2b4daa CM |
6083 | if (!is_orig_bio) { |
6084 | bio_put(bio); | |
a1d3c478 | 6085 | bio = bbio->orig_bio; |
7d2b4daa | 6086 | } |
c7b22bb1 | 6087 | |
9be3395b | 6088 | btrfs_io_bio(bio)->mirror_num = bbio->mirror_num; |
a236aed1 | 6089 | /* only send an error to the higher layers if it is |
53b381b3 | 6090 | * beyond the tolerance of the btrfs bio |
a236aed1 | 6091 | */ |
a1d3c478 | 6092 | if (atomic_read(&bbio->error) > bbio->max_errors) { |
4e4cbee9 | 6093 | bio->bi_status = BLK_STS_IOERR; |
5dbc8fca | 6094 | } else { |
1259ab75 CM |
6095 | /* |
6096 | * this bio is actually up to date, we didn't | |
6097 | * go over the max number of errors | |
6098 | */ | |
4e4cbee9 | 6099 | bio->bi_status = 0; |
1259ab75 | 6100 | } |
c55f1396 | 6101 | |
4246a0b6 | 6102 | btrfs_end_bbio(bbio, bio); |
7d2b4daa | 6103 | } else if (!is_orig_bio) { |
8790d502 CM |
6104 | bio_put(bio); |
6105 | } | |
8790d502 CM |
6106 | } |
6107 | ||
8b712842 CM |
6108 | /* |
6109 | * see run_scheduled_bios for a description of why bios are collected for | |
6110 | * async submit. | |
6111 | * | |
6112 | * This will add one bio to the pending list for a device and make sure | |
6113 | * the work struct is scheduled. | |
6114 | */ | |
2ff7e61e | 6115 | static noinline void btrfs_schedule_bio(struct btrfs_device *device, |
4e49ea4a | 6116 | struct bio *bio) |
8b712842 | 6117 | { |
0b246afa | 6118 | struct btrfs_fs_info *fs_info = device->fs_info; |
8b712842 | 6119 | int should_queue = 1; |
ffbd517d | 6120 | struct btrfs_pending_bios *pending_bios; |
8b712842 | 6121 | |
53b381b3 | 6122 | if (device->missing || !device->bdev) { |
4246a0b6 | 6123 | bio_io_error(bio); |
53b381b3 DW |
6124 | return; |
6125 | } | |
6126 | ||
8b712842 | 6127 | /* don't bother with additional async steps for reads, right now */ |
37226b21 | 6128 | if (bio_op(bio) == REQ_OP_READ) { |
492bb6de | 6129 | bio_get(bio); |
4e49ea4a | 6130 | btrfsic_submit_bio(bio); |
492bb6de | 6131 | bio_put(bio); |
143bede5 | 6132 | return; |
8b712842 CM |
6133 | } |
6134 | ||
6135 | /* | |
0986fe9e | 6136 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
6137 | * higher layers. Otherwise, the async bio makes it appear we have |
6138 | * made progress against dirty pages when we've really just put it | |
6139 | * on a queue for later | |
6140 | */ | |
0b246afa | 6141 | atomic_inc(&fs_info->nr_async_bios); |
492bb6de | 6142 | WARN_ON(bio->bi_next); |
8b712842 | 6143 | bio->bi_next = NULL; |
8b712842 CM |
6144 | |
6145 | spin_lock(&device->io_lock); | |
67f055c7 | 6146 | if (op_is_sync(bio->bi_opf)) |
ffbd517d CM |
6147 | pending_bios = &device->pending_sync_bios; |
6148 | else | |
6149 | pending_bios = &device->pending_bios; | |
8b712842 | 6150 | |
ffbd517d CM |
6151 | if (pending_bios->tail) |
6152 | pending_bios->tail->bi_next = bio; | |
8b712842 | 6153 | |
ffbd517d CM |
6154 | pending_bios->tail = bio; |
6155 | if (!pending_bios->head) | |
6156 | pending_bios->head = bio; | |
8b712842 CM |
6157 | if (device->running_pending) |
6158 | should_queue = 0; | |
6159 | ||
6160 | spin_unlock(&device->io_lock); | |
6161 | ||
6162 | if (should_queue) | |
0b246afa | 6163 | btrfs_queue_work(fs_info->submit_workers, &device->work); |
8b712842 CM |
6164 | } |
6165 | ||
2ff7e61e JM |
6166 | static void submit_stripe_bio(struct btrfs_bio *bbio, struct bio *bio, |
6167 | u64 physical, int dev_nr, int async) | |
de1ee92a JB |
6168 | { |
6169 | struct btrfs_device *dev = bbio->stripes[dev_nr].dev; | |
2ff7e61e | 6170 | struct btrfs_fs_info *fs_info = bbio->fs_info; |
de1ee92a JB |
6171 | |
6172 | bio->bi_private = bbio; | |
9be3395b | 6173 | btrfs_io_bio(bio)->stripe_index = dev_nr; |
de1ee92a | 6174 | bio->bi_end_io = btrfs_end_bio; |
4f024f37 | 6175 | bio->bi_iter.bi_sector = physical >> 9; |
de1ee92a JB |
6176 | #ifdef DEBUG |
6177 | { | |
6178 | struct rcu_string *name; | |
6179 | ||
6180 | rcu_read_lock(); | |
6181 | name = rcu_dereference(dev->name); | |
ab8d0fc4 JM |
6182 | btrfs_debug(fs_info, |
6183 | "btrfs_map_bio: rw %d 0x%x, sector=%llu, dev=%lu (%s id %llu), size=%u", | |
6184 | bio_op(bio), bio->bi_opf, | |
6185 | (u64)bio->bi_iter.bi_sector, | |
6186 | (u_long)dev->bdev->bd_dev, name->str, dev->devid, | |
6187 | bio->bi_iter.bi_size); | |
de1ee92a JB |
6188 | rcu_read_unlock(); |
6189 | } | |
6190 | #endif | |
6191 | bio->bi_bdev = dev->bdev; | |
c404e0dc | 6192 | |
2ff7e61e | 6193 | btrfs_bio_counter_inc_noblocked(fs_info); |
c404e0dc | 6194 | |
de1ee92a | 6195 | if (async) |
2ff7e61e | 6196 | btrfs_schedule_bio(dev, bio); |
de1ee92a | 6197 | else |
4e49ea4a | 6198 | btrfsic_submit_bio(bio); |
de1ee92a JB |
6199 | } |
6200 | ||
de1ee92a JB |
6201 | static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical) |
6202 | { | |
6203 | atomic_inc(&bbio->error); | |
6204 | if (atomic_dec_and_test(&bbio->stripes_pending)) { | |
01327610 | 6205 | /* Should be the original bio. */ |
8408c716 MX |
6206 | WARN_ON(bio != bbio->orig_bio); |
6207 | ||
9be3395b | 6208 | btrfs_io_bio(bio)->mirror_num = bbio->mirror_num; |
4f024f37 | 6209 | bio->bi_iter.bi_sector = logical >> 9; |
4e4cbee9 | 6210 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 | 6211 | btrfs_end_bbio(bbio, bio); |
de1ee92a JB |
6212 | } |
6213 | } | |
6214 | ||
2ff7e61e | 6215 | int btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio, |
8b712842 | 6216 | int mirror_num, int async_submit) |
0b86a832 | 6217 | { |
0b86a832 | 6218 | struct btrfs_device *dev; |
8790d502 | 6219 | struct bio *first_bio = bio; |
4f024f37 | 6220 | u64 logical = (u64)bio->bi_iter.bi_sector << 9; |
0b86a832 CM |
6221 | u64 length = 0; |
6222 | u64 map_length; | |
0b86a832 | 6223 | int ret; |
08da757d ZL |
6224 | int dev_nr; |
6225 | int total_devs; | |
a1d3c478 | 6226 | struct btrfs_bio *bbio = NULL; |
0b86a832 | 6227 | |
4f024f37 | 6228 | length = bio->bi_iter.bi_size; |
0b86a832 | 6229 | map_length = length; |
cea9e445 | 6230 | |
0b246afa JM |
6231 | btrfs_bio_counter_inc_blocked(fs_info); |
6232 | ret = __btrfs_map_block(fs_info, bio_op(bio), logical, | |
37226b21 | 6233 | &map_length, &bbio, mirror_num, 1); |
c404e0dc | 6234 | if (ret) { |
0b246afa | 6235 | btrfs_bio_counter_dec(fs_info); |
79787eaa | 6236 | return ret; |
c404e0dc | 6237 | } |
cea9e445 | 6238 | |
a1d3c478 | 6239 | total_devs = bbio->num_stripes; |
53b381b3 DW |
6240 | bbio->orig_bio = first_bio; |
6241 | bbio->private = first_bio->bi_private; | |
6242 | bbio->end_io = first_bio->bi_end_io; | |
0b246afa | 6243 | bbio->fs_info = fs_info; |
53b381b3 DW |
6244 | atomic_set(&bbio->stripes_pending, bbio->num_stripes); |
6245 | ||
ad1ba2a0 | 6246 | if ((bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) && |
37226b21 | 6247 | ((bio_op(bio) == REQ_OP_WRITE) || (mirror_num > 1))) { |
53b381b3 DW |
6248 | /* In this case, map_length has been set to the length of |
6249 | a single stripe; not the whole write */ | |
37226b21 | 6250 | if (bio_op(bio) == REQ_OP_WRITE) { |
2ff7e61e JM |
6251 | ret = raid56_parity_write(fs_info, bio, bbio, |
6252 | map_length); | |
53b381b3 | 6253 | } else { |
2ff7e61e JM |
6254 | ret = raid56_parity_recover(fs_info, bio, bbio, |
6255 | map_length, mirror_num, 1); | |
53b381b3 | 6256 | } |
4245215d | 6257 | |
0b246afa | 6258 | btrfs_bio_counter_dec(fs_info); |
c404e0dc | 6259 | return ret; |
53b381b3 DW |
6260 | } |
6261 | ||
cea9e445 | 6262 | if (map_length < length) { |
0b246afa | 6263 | btrfs_crit(fs_info, |
5d163e0e JM |
6264 | "mapping failed logical %llu bio len %llu len %llu", |
6265 | logical, length, map_length); | |
cea9e445 CM |
6266 | BUG(); |
6267 | } | |
a1d3c478 | 6268 | |
08da757d | 6269 | for (dev_nr = 0; dev_nr < total_devs; dev_nr++) { |
de1ee92a | 6270 | dev = bbio->stripes[dev_nr].dev; |
37226b21 | 6271 | if (!dev || !dev->bdev || |
a967efb3 | 6272 | (bio_op(first_bio) == REQ_OP_WRITE && !dev->writeable)) { |
de1ee92a | 6273 | bbio_error(bbio, first_bio, logical); |
de1ee92a JB |
6274 | continue; |
6275 | } | |
6276 | ||
3aa8e074 | 6277 | if (dev_nr < total_devs - 1) |
8b6c1d56 | 6278 | bio = btrfs_bio_clone(first_bio); |
3aa8e074 | 6279 | else |
a1d3c478 | 6280 | bio = first_bio; |
de1ee92a | 6281 | |
2ff7e61e JM |
6282 | submit_stripe_bio(bbio, bio, bbio->stripes[dev_nr].physical, |
6283 | dev_nr, async_submit); | |
8790d502 | 6284 | } |
0b246afa | 6285 | btrfs_bio_counter_dec(fs_info); |
0b86a832 CM |
6286 | return 0; |
6287 | } | |
6288 | ||
aa1b8cd4 | 6289 | struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid, |
2b82032c | 6290 | u8 *uuid, u8 *fsid) |
0b86a832 | 6291 | { |
2b82032c YZ |
6292 | struct btrfs_device *device; |
6293 | struct btrfs_fs_devices *cur_devices; | |
6294 | ||
aa1b8cd4 | 6295 | cur_devices = fs_info->fs_devices; |
2b82032c YZ |
6296 | while (cur_devices) { |
6297 | if (!fsid || | |
6298 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
6299 | device = __find_device(&cur_devices->devices, | |
6300 | devid, uuid); | |
6301 | if (device) | |
6302 | return device; | |
6303 | } | |
6304 | cur_devices = cur_devices->seed; | |
6305 | } | |
6306 | return NULL; | |
0b86a832 CM |
6307 | } |
6308 | ||
2ff7e61e | 6309 | static struct btrfs_device *add_missing_dev(struct btrfs_fs_devices *fs_devices, |
dfe25020 CM |
6310 | u64 devid, u8 *dev_uuid) |
6311 | { | |
6312 | struct btrfs_device *device; | |
dfe25020 | 6313 | |
12bd2fc0 ID |
6314 | device = btrfs_alloc_device(NULL, &devid, dev_uuid); |
6315 | if (IS_ERR(device)) | |
7cbd8a83 | 6316 | return NULL; |
12bd2fc0 ID |
6317 | |
6318 | list_add(&device->dev_list, &fs_devices->devices); | |
e4404d6e | 6319 | device->fs_devices = fs_devices; |
dfe25020 | 6320 | fs_devices->num_devices++; |
12bd2fc0 ID |
6321 | |
6322 | device->missing = 1; | |
cd02dca5 | 6323 | fs_devices->missing_devices++; |
12bd2fc0 | 6324 | |
dfe25020 CM |
6325 | return device; |
6326 | } | |
6327 | ||
12bd2fc0 ID |
6328 | /** |
6329 | * btrfs_alloc_device - allocate struct btrfs_device | |
6330 | * @fs_info: used only for generating a new devid, can be NULL if | |
6331 | * devid is provided (i.e. @devid != NULL). | |
6332 | * @devid: a pointer to devid for this device. If NULL a new devid | |
6333 | * is generated. | |
6334 | * @uuid: a pointer to UUID for this device. If NULL a new UUID | |
6335 | * is generated. | |
6336 | * | |
6337 | * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR() | |
6338 | * on error. Returned struct is not linked onto any lists and can be | |
6339 | * destroyed with kfree() right away. | |
6340 | */ | |
6341 | struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, | |
6342 | const u64 *devid, | |
6343 | const u8 *uuid) | |
6344 | { | |
6345 | struct btrfs_device *dev; | |
6346 | u64 tmp; | |
6347 | ||
fae7f21c | 6348 | if (WARN_ON(!devid && !fs_info)) |
12bd2fc0 | 6349 | return ERR_PTR(-EINVAL); |
12bd2fc0 ID |
6350 | |
6351 | dev = __alloc_device(); | |
6352 | if (IS_ERR(dev)) | |
6353 | return dev; | |
6354 | ||
6355 | if (devid) | |
6356 | tmp = *devid; | |
6357 | else { | |
6358 | int ret; | |
6359 | ||
6360 | ret = find_next_devid(fs_info, &tmp); | |
6361 | if (ret) { | |
6362 | kfree(dev); | |
6363 | return ERR_PTR(ret); | |
6364 | } | |
6365 | } | |
6366 | dev->devid = tmp; | |
6367 | ||
6368 | if (uuid) | |
6369 | memcpy(dev->uuid, uuid, BTRFS_UUID_SIZE); | |
6370 | else | |
6371 | generate_random_uuid(dev->uuid); | |
6372 | ||
9e0af237 LB |
6373 | btrfs_init_work(&dev->work, btrfs_submit_helper, |
6374 | pending_bios_fn, NULL, NULL); | |
12bd2fc0 ID |
6375 | |
6376 | return dev; | |
6377 | } | |
6378 | ||
e06cd3dd | 6379 | /* Return -EIO if any error, otherwise return 0. */ |
2ff7e61e | 6380 | static int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info, |
e06cd3dd LB |
6381 | struct extent_buffer *leaf, |
6382 | struct btrfs_chunk *chunk, u64 logical) | |
0b86a832 | 6383 | { |
0b86a832 | 6384 | u64 length; |
f04b772b | 6385 | u64 stripe_len; |
e06cd3dd LB |
6386 | u16 num_stripes; |
6387 | u16 sub_stripes; | |
6388 | u64 type; | |
0b86a832 | 6389 | |
e17cade2 | 6390 | length = btrfs_chunk_length(leaf, chunk); |
f04b772b QW |
6391 | stripe_len = btrfs_chunk_stripe_len(leaf, chunk); |
6392 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
e06cd3dd LB |
6393 | sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
6394 | type = btrfs_chunk_type(leaf, chunk); | |
6395 | ||
f04b772b | 6396 | if (!num_stripes) { |
0b246afa | 6397 | btrfs_err(fs_info, "invalid chunk num_stripes: %u", |
f04b772b QW |
6398 | num_stripes); |
6399 | return -EIO; | |
6400 | } | |
0b246afa JM |
6401 | if (!IS_ALIGNED(logical, fs_info->sectorsize)) { |
6402 | btrfs_err(fs_info, "invalid chunk logical %llu", logical); | |
f04b772b QW |
6403 | return -EIO; |
6404 | } | |
0b246afa JM |
6405 | if (btrfs_chunk_sector_size(leaf, chunk) != fs_info->sectorsize) { |
6406 | btrfs_err(fs_info, "invalid chunk sectorsize %u", | |
e06cd3dd LB |
6407 | btrfs_chunk_sector_size(leaf, chunk)); |
6408 | return -EIO; | |
6409 | } | |
0b246afa JM |
6410 | if (!length || !IS_ALIGNED(length, fs_info->sectorsize)) { |
6411 | btrfs_err(fs_info, "invalid chunk length %llu", length); | |
f04b772b QW |
6412 | return -EIO; |
6413 | } | |
3d8da678 | 6414 | if (!is_power_of_2(stripe_len) || stripe_len != BTRFS_STRIPE_LEN) { |
0b246afa | 6415 | btrfs_err(fs_info, "invalid chunk stripe length: %llu", |
f04b772b QW |
6416 | stripe_len); |
6417 | return -EIO; | |
6418 | } | |
6419 | if (~(BTRFS_BLOCK_GROUP_TYPE_MASK | BTRFS_BLOCK_GROUP_PROFILE_MASK) & | |
e06cd3dd | 6420 | type) { |
0b246afa | 6421 | btrfs_err(fs_info, "unrecognized chunk type: %llu", |
f04b772b QW |
6422 | ~(BTRFS_BLOCK_GROUP_TYPE_MASK | |
6423 | BTRFS_BLOCK_GROUP_PROFILE_MASK) & | |
6424 | btrfs_chunk_type(leaf, chunk)); | |
6425 | return -EIO; | |
6426 | } | |
e06cd3dd LB |
6427 | if ((type & BTRFS_BLOCK_GROUP_RAID10 && sub_stripes != 2) || |
6428 | (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes < 1) || | |
6429 | (type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) || | |
6430 | (type & BTRFS_BLOCK_GROUP_RAID6 && num_stripes < 3) || | |
6431 | (type & BTRFS_BLOCK_GROUP_DUP && num_stripes > 2) || | |
6432 | ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 && | |
6433 | num_stripes != 1)) { | |
0b246afa | 6434 | btrfs_err(fs_info, |
e06cd3dd LB |
6435 | "invalid num_stripes:sub_stripes %u:%u for profile %llu", |
6436 | num_stripes, sub_stripes, | |
6437 | type & BTRFS_BLOCK_GROUP_PROFILE_MASK); | |
6438 | return -EIO; | |
6439 | } | |
6440 | ||
6441 | return 0; | |
6442 | } | |
6443 | ||
2ff7e61e | 6444 | static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key, |
e06cd3dd LB |
6445 | struct extent_buffer *leaf, |
6446 | struct btrfs_chunk *chunk) | |
6447 | { | |
0b246afa | 6448 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
e06cd3dd LB |
6449 | struct map_lookup *map; |
6450 | struct extent_map *em; | |
6451 | u64 logical; | |
6452 | u64 length; | |
6453 | u64 stripe_len; | |
6454 | u64 devid; | |
6455 | u8 uuid[BTRFS_UUID_SIZE]; | |
6456 | int num_stripes; | |
6457 | int ret; | |
6458 | int i; | |
6459 | ||
6460 | logical = key->offset; | |
6461 | length = btrfs_chunk_length(leaf, chunk); | |
6462 | stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
6463 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
6464 | ||
2ff7e61e | 6465 | ret = btrfs_check_chunk_valid(fs_info, leaf, chunk, logical); |
e06cd3dd LB |
6466 | if (ret) |
6467 | return ret; | |
a061fc8d | 6468 | |
890871be | 6469 | read_lock(&map_tree->map_tree.lock); |
0b86a832 | 6470 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
890871be | 6471 | read_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
6472 | |
6473 | /* already mapped? */ | |
6474 | if (em && em->start <= logical && em->start + em->len > logical) { | |
6475 | free_extent_map(em); | |
0b86a832 CM |
6476 | return 0; |
6477 | } else if (em) { | |
6478 | free_extent_map(em); | |
6479 | } | |
0b86a832 | 6480 | |
172ddd60 | 6481 | em = alloc_extent_map(); |
0b86a832 CM |
6482 | if (!em) |
6483 | return -ENOMEM; | |
593060d7 | 6484 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); |
0b86a832 CM |
6485 | if (!map) { |
6486 | free_extent_map(em); | |
6487 | return -ENOMEM; | |
6488 | } | |
6489 | ||
298a8f9c | 6490 | set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags); |
95617d69 | 6491 | em->map_lookup = map; |
0b86a832 CM |
6492 | em->start = logical; |
6493 | em->len = length; | |
70c8a91c | 6494 | em->orig_start = 0; |
0b86a832 | 6495 | em->block_start = 0; |
c8b97818 | 6496 | em->block_len = em->len; |
0b86a832 | 6497 | |
593060d7 CM |
6498 | map->num_stripes = num_stripes; |
6499 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
6500 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
6501 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
6502 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
6503 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 6504 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
6505 | for (i = 0; i < num_stripes; i++) { |
6506 | map->stripes[i].physical = | |
6507 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
6508 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
6509 | read_extent_buffer(leaf, uuid, (unsigned long) |
6510 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
6511 | BTRFS_UUID_SIZE); | |
0b246afa | 6512 | map->stripes[i].dev = btrfs_find_device(fs_info, devid, |
aa1b8cd4 | 6513 | uuid, NULL); |
3cdde224 | 6514 | if (!map->stripes[i].dev && |
0b246afa | 6515 | !btrfs_test_opt(fs_info, DEGRADED)) { |
593060d7 CM |
6516 | free_extent_map(em); |
6517 | return -EIO; | |
6518 | } | |
dfe25020 CM |
6519 | if (!map->stripes[i].dev) { |
6520 | map->stripes[i].dev = | |
2ff7e61e JM |
6521 | add_missing_dev(fs_info->fs_devices, devid, |
6522 | uuid); | |
dfe25020 | 6523 | if (!map->stripes[i].dev) { |
dfe25020 CM |
6524 | free_extent_map(em); |
6525 | return -EIO; | |
6526 | } | |
0b246afa | 6527 | btrfs_warn(fs_info, "devid %llu uuid %pU is missing", |
5d163e0e | 6528 | devid, uuid); |
dfe25020 CM |
6529 | } |
6530 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
6531 | } |
6532 | ||
890871be | 6533 | write_lock(&map_tree->map_tree.lock); |
09a2a8f9 | 6534 | ret = add_extent_mapping(&map_tree->map_tree, em, 0); |
890871be | 6535 | write_unlock(&map_tree->map_tree.lock); |
79787eaa | 6536 | BUG_ON(ret); /* Tree corruption */ |
0b86a832 CM |
6537 | free_extent_map(em); |
6538 | ||
6539 | return 0; | |
6540 | } | |
6541 | ||
143bede5 | 6542 | static void fill_device_from_item(struct extent_buffer *leaf, |
0b86a832 CM |
6543 | struct btrfs_dev_item *dev_item, |
6544 | struct btrfs_device *device) | |
6545 | { | |
6546 | unsigned long ptr; | |
0b86a832 CM |
6547 | |
6548 | device->devid = btrfs_device_id(leaf, dev_item); | |
d6397bae CB |
6549 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
6550 | device->total_bytes = device->disk_total_bytes; | |
935e5cc9 | 6551 | device->commit_total_bytes = device->disk_total_bytes; |
0b86a832 | 6552 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
ce7213c7 | 6553 | device->commit_bytes_used = device->bytes_used; |
0b86a832 CM |
6554 | device->type = btrfs_device_type(leaf, dev_item); |
6555 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
6556 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
6557 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
8dabb742 | 6558 | WARN_ON(device->devid == BTRFS_DEV_REPLACE_DEVID); |
63a212ab | 6559 | device->is_tgtdev_for_dev_replace = 0; |
0b86a832 | 6560 | |
410ba3a2 | 6561 | ptr = btrfs_device_uuid(dev_item); |
e17cade2 | 6562 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 CM |
6563 | } |
6564 | ||
2ff7e61e | 6565 | static struct btrfs_fs_devices *open_seed_devices(struct btrfs_fs_info *fs_info, |
5f375835 | 6566 | u8 *fsid) |
2b82032c YZ |
6567 | { |
6568 | struct btrfs_fs_devices *fs_devices; | |
6569 | int ret; | |
6570 | ||
b367e47f | 6571 | BUG_ON(!mutex_is_locked(&uuid_mutex)); |
2b82032c | 6572 | |
0b246afa | 6573 | fs_devices = fs_info->fs_devices->seed; |
2b82032c | 6574 | while (fs_devices) { |
5f375835 MX |
6575 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) |
6576 | return fs_devices; | |
6577 | ||
2b82032c YZ |
6578 | fs_devices = fs_devices->seed; |
6579 | } | |
6580 | ||
6581 | fs_devices = find_fsid(fsid); | |
6582 | if (!fs_devices) { | |
0b246afa | 6583 | if (!btrfs_test_opt(fs_info, DEGRADED)) |
5f375835 MX |
6584 | return ERR_PTR(-ENOENT); |
6585 | ||
6586 | fs_devices = alloc_fs_devices(fsid); | |
6587 | if (IS_ERR(fs_devices)) | |
6588 | return fs_devices; | |
6589 | ||
6590 | fs_devices->seeding = 1; | |
6591 | fs_devices->opened = 1; | |
6592 | return fs_devices; | |
2b82032c | 6593 | } |
e4404d6e YZ |
6594 | |
6595 | fs_devices = clone_fs_devices(fs_devices); | |
5f375835 MX |
6596 | if (IS_ERR(fs_devices)) |
6597 | return fs_devices; | |
2b82032c | 6598 | |
97288f2c | 6599 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
0b246afa | 6600 | fs_info->bdev_holder); |
48d28232 JL |
6601 | if (ret) { |
6602 | free_fs_devices(fs_devices); | |
5f375835 | 6603 | fs_devices = ERR_PTR(ret); |
2b82032c | 6604 | goto out; |
48d28232 | 6605 | } |
2b82032c YZ |
6606 | |
6607 | if (!fs_devices->seeding) { | |
6608 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 6609 | free_fs_devices(fs_devices); |
5f375835 | 6610 | fs_devices = ERR_PTR(-EINVAL); |
2b82032c YZ |
6611 | goto out; |
6612 | } | |
6613 | ||
0b246afa JM |
6614 | fs_devices->seed = fs_info->fs_devices->seed; |
6615 | fs_info->fs_devices->seed = fs_devices; | |
2b82032c | 6616 | out: |
5f375835 | 6617 | return fs_devices; |
2b82032c YZ |
6618 | } |
6619 | ||
2ff7e61e | 6620 | static int read_one_dev(struct btrfs_fs_info *fs_info, |
0b86a832 CM |
6621 | struct extent_buffer *leaf, |
6622 | struct btrfs_dev_item *dev_item) | |
6623 | { | |
0b246afa | 6624 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
0b86a832 CM |
6625 | struct btrfs_device *device; |
6626 | u64 devid; | |
6627 | int ret; | |
2b82032c | 6628 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
6629 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
6630 | ||
0b86a832 | 6631 | devid = btrfs_device_id(leaf, dev_item); |
410ba3a2 | 6632 | read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item), |
a443755f | 6633 | BTRFS_UUID_SIZE); |
1473b24e | 6634 | read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item), |
2b82032c YZ |
6635 | BTRFS_UUID_SIZE); |
6636 | ||
0b246afa | 6637 | if (memcmp(fs_uuid, fs_info->fsid, BTRFS_UUID_SIZE)) { |
2ff7e61e | 6638 | fs_devices = open_seed_devices(fs_info, fs_uuid); |
5f375835 MX |
6639 | if (IS_ERR(fs_devices)) |
6640 | return PTR_ERR(fs_devices); | |
2b82032c YZ |
6641 | } |
6642 | ||
0b246afa | 6643 | device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid); |
5f375835 | 6644 | if (!device) { |
0b246afa | 6645 | if (!btrfs_test_opt(fs_info, DEGRADED)) |
2b82032c YZ |
6646 | return -EIO; |
6647 | ||
2ff7e61e | 6648 | device = add_missing_dev(fs_devices, devid, dev_uuid); |
5f375835 MX |
6649 | if (!device) |
6650 | return -ENOMEM; | |
0b246afa | 6651 | btrfs_warn(fs_info, "devid %llu uuid %pU missing", |
33b97e43 | 6652 | devid, dev_uuid); |
5f375835 | 6653 | } else { |
0b246afa | 6654 | if (!device->bdev && !btrfs_test_opt(fs_info, DEGRADED)) |
5f375835 MX |
6655 | return -EIO; |
6656 | ||
6657 | if(!device->bdev && !device->missing) { | |
cd02dca5 CM |
6658 | /* |
6659 | * this happens when a device that was properly setup | |
6660 | * in the device info lists suddenly goes bad. | |
6661 | * device->bdev is NULL, and so we have to set | |
6662 | * device->missing to one here | |
6663 | */ | |
5f375835 | 6664 | device->fs_devices->missing_devices++; |
cd02dca5 | 6665 | device->missing = 1; |
2b82032c | 6666 | } |
5f375835 MX |
6667 | |
6668 | /* Move the device to its own fs_devices */ | |
6669 | if (device->fs_devices != fs_devices) { | |
6670 | ASSERT(device->missing); | |
6671 | ||
6672 | list_move(&device->dev_list, &fs_devices->devices); | |
6673 | device->fs_devices->num_devices--; | |
6674 | fs_devices->num_devices++; | |
6675 | ||
6676 | device->fs_devices->missing_devices--; | |
6677 | fs_devices->missing_devices++; | |
6678 | ||
6679 | device->fs_devices = fs_devices; | |
6680 | } | |
2b82032c YZ |
6681 | } |
6682 | ||
0b246afa | 6683 | if (device->fs_devices != fs_info->fs_devices) { |
2b82032c YZ |
6684 | BUG_ON(device->writeable); |
6685 | if (device->generation != | |
6686 | btrfs_device_generation(leaf, dev_item)) | |
6687 | return -EINVAL; | |
6324fbf3 | 6688 | } |
0b86a832 CM |
6689 | |
6690 | fill_device_from_item(leaf, dev_item, device); | |
dfe25020 | 6691 | device->in_fs_metadata = 1; |
63a212ab | 6692 | if (device->writeable && !device->is_tgtdev_for_dev_replace) { |
2b82032c | 6693 | device->fs_devices->total_rw_bytes += device->total_bytes; |
a5ed45f8 NB |
6694 | atomic64_add(device->total_bytes - device->bytes_used, |
6695 | &fs_info->free_chunk_space); | |
2bf64758 | 6696 | } |
0b86a832 | 6697 | ret = 0; |
0b86a832 CM |
6698 | return ret; |
6699 | } | |
6700 | ||
6bccf3ab | 6701 | int btrfs_read_sys_array(struct btrfs_fs_info *fs_info) |
0b86a832 | 6702 | { |
6bccf3ab | 6703 | struct btrfs_root *root = fs_info->tree_root; |
ab8d0fc4 | 6704 | struct btrfs_super_block *super_copy = fs_info->super_copy; |
a061fc8d | 6705 | struct extent_buffer *sb; |
0b86a832 | 6706 | struct btrfs_disk_key *disk_key; |
0b86a832 | 6707 | struct btrfs_chunk *chunk; |
1ffb22cf DS |
6708 | u8 *array_ptr; |
6709 | unsigned long sb_array_offset; | |
84eed90f | 6710 | int ret = 0; |
0b86a832 CM |
6711 | u32 num_stripes; |
6712 | u32 array_size; | |
6713 | u32 len = 0; | |
1ffb22cf | 6714 | u32 cur_offset; |
e06cd3dd | 6715 | u64 type; |
84eed90f | 6716 | struct btrfs_key key; |
0b86a832 | 6717 | |
0b246afa | 6718 | ASSERT(BTRFS_SUPER_INFO_SIZE <= fs_info->nodesize); |
a83fffb7 DS |
6719 | /* |
6720 | * This will create extent buffer of nodesize, superblock size is | |
6721 | * fixed to BTRFS_SUPER_INFO_SIZE. If nodesize > sb size, this will | |
6722 | * overallocate but we can keep it as-is, only the first page is used. | |
6723 | */ | |
2ff7e61e | 6724 | sb = btrfs_find_create_tree_block(fs_info, BTRFS_SUPER_INFO_OFFSET); |
c871b0f2 LB |
6725 | if (IS_ERR(sb)) |
6726 | return PTR_ERR(sb); | |
4db8c528 | 6727 | set_extent_buffer_uptodate(sb); |
85d4e461 | 6728 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0); |
8a334426 | 6729 | /* |
01327610 | 6730 | * The sb extent buffer is artificial and just used to read the system array. |
4db8c528 | 6731 | * set_extent_buffer_uptodate() call does not properly mark all it's |
8a334426 DS |
6732 | * pages up-to-date when the page is larger: extent does not cover the |
6733 | * whole page and consequently check_page_uptodate does not find all | |
6734 | * the page's extents up-to-date (the hole beyond sb), | |
6735 | * write_extent_buffer then triggers a WARN_ON. | |
6736 | * | |
6737 | * Regular short extents go through mark_extent_buffer_dirty/writeback cycle, | |
6738 | * but sb spans only this function. Add an explicit SetPageUptodate call | |
6739 | * to silence the warning eg. on PowerPC 64. | |
6740 | */ | |
09cbfeaf | 6741 | if (PAGE_SIZE > BTRFS_SUPER_INFO_SIZE) |
727011e0 | 6742 | SetPageUptodate(sb->pages[0]); |
4008c04a | 6743 | |
a061fc8d | 6744 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
6745 | array_size = btrfs_super_sys_array_size(super_copy); |
6746 | ||
1ffb22cf DS |
6747 | array_ptr = super_copy->sys_chunk_array; |
6748 | sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array); | |
6749 | cur_offset = 0; | |
0b86a832 | 6750 | |
1ffb22cf DS |
6751 | while (cur_offset < array_size) { |
6752 | disk_key = (struct btrfs_disk_key *)array_ptr; | |
e3540eab DS |
6753 | len = sizeof(*disk_key); |
6754 | if (cur_offset + len > array_size) | |
6755 | goto out_short_read; | |
6756 | ||
0b86a832 CM |
6757 | btrfs_disk_key_to_cpu(&key, disk_key); |
6758 | ||
1ffb22cf DS |
6759 | array_ptr += len; |
6760 | sb_array_offset += len; | |
6761 | cur_offset += len; | |
0b86a832 | 6762 | |
0d81ba5d | 6763 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
1ffb22cf | 6764 | chunk = (struct btrfs_chunk *)sb_array_offset; |
e3540eab DS |
6765 | /* |
6766 | * At least one btrfs_chunk with one stripe must be | |
6767 | * present, exact stripe count check comes afterwards | |
6768 | */ | |
6769 | len = btrfs_chunk_item_size(1); | |
6770 | if (cur_offset + len > array_size) | |
6771 | goto out_short_read; | |
6772 | ||
6773 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); | |
f5cdedd7 | 6774 | if (!num_stripes) { |
ab8d0fc4 JM |
6775 | btrfs_err(fs_info, |
6776 | "invalid number of stripes %u in sys_array at offset %u", | |
f5cdedd7 DS |
6777 | num_stripes, cur_offset); |
6778 | ret = -EIO; | |
6779 | break; | |
6780 | } | |
6781 | ||
e06cd3dd LB |
6782 | type = btrfs_chunk_type(sb, chunk); |
6783 | if ((type & BTRFS_BLOCK_GROUP_SYSTEM) == 0) { | |
ab8d0fc4 | 6784 | btrfs_err(fs_info, |
e06cd3dd LB |
6785 | "invalid chunk type %llu in sys_array at offset %u", |
6786 | type, cur_offset); | |
6787 | ret = -EIO; | |
6788 | break; | |
6789 | } | |
6790 | ||
e3540eab DS |
6791 | len = btrfs_chunk_item_size(num_stripes); |
6792 | if (cur_offset + len > array_size) | |
6793 | goto out_short_read; | |
6794 | ||
2ff7e61e | 6795 | ret = read_one_chunk(fs_info, &key, sb, chunk); |
84eed90f CM |
6796 | if (ret) |
6797 | break; | |
0b86a832 | 6798 | } else { |
ab8d0fc4 JM |
6799 | btrfs_err(fs_info, |
6800 | "unexpected item type %u in sys_array at offset %u", | |
6801 | (u32)key.type, cur_offset); | |
84eed90f CM |
6802 | ret = -EIO; |
6803 | break; | |
0b86a832 | 6804 | } |
1ffb22cf DS |
6805 | array_ptr += len; |
6806 | sb_array_offset += len; | |
6807 | cur_offset += len; | |
0b86a832 | 6808 | } |
d865177a | 6809 | clear_extent_buffer_uptodate(sb); |
1c8b5b6e | 6810 | free_extent_buffer_stale(sb); |
84eed90f | 6811 | return ret; |
e3540eab DS |
6812 | |
6813 | out_short_read: | |
ab8d0fc4 | 6814 | btrfs_err(fs_info, "sys_array too short to read %u bytes at offset %u", |
e3540eab | 6815 | len, cur_offset); |
d865177a | 6816 | clear_extent_buffer_uptodate(sb); |
1c8b5b6e | 6817 | free_extent_buffer_stale(sb); |
e3540eab | 6818 | return -EIO; |
0b86a832 CM |
6819 | } |
6820 | ||
5b4aacef | 6821 | int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info) |
0b86a832 | 6822 | { |
5b4aacef | 6823 | struct btrfs_root *root = fs_info->chunk_root; |
0b86a832 CM |
6824 | struct btrfs_path *path; |
6825 | struct extent_buffer *leaf; | |
6826 | struct btrfs_key key; | |
6827 | struct btrfs_key found_key; | |
6828 | int ret; | |
6829 | int slot; | |
99e3ecfc | 6830 | u64 total_dev = 0; |
0b86a832 | 6831 | |
0b86a832 CM |
6832 | path = btrfs_alloc_path(); |
6833 | if (!path) | |
6834 | return -ENOMEM; | |
6835 | ||
b367e47f | 6836 | mutex_lock(&uuid_mutex); |
34441361 | 6837 | mutex_lock(&fs_info->chunk_mutex); |
b367e47f | 6838 | |
395927a9 FDBM |
6839 | /* |
6840 | * Read all device items, and then all the chunk items. All | |
6841 | * device items are found before any chunk item (their object id | |
6842 | * is smaller than the lowest possible object id for a chunk | |
6843 | * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID). | |
0b86a832 CM |
6844 | */ |
6845 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
6846 | key.offset = 0; | |
6847 | key.type = 0; | |
0b86a832 | 6848 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
ab59381e ZL |
6849 | if (ret < 0) |
6850 | goto error; | |
d397712b | 6851 | while (1) { |
0b86a832 CM |
6852 | leaf = path->nodes[0]; |
6853 | slot = path->slots[0]; | |
6854 | if (slot >= btrfs_header_nritems(leaf)) { | |
6855 | ret = btrfs_next_leaf(root, path); | |
6856 | if (ret == 0) | |
6857 | continue; | |
6858 | if (ret < 0) | |
6859 | goto error; | |
6860 | break; | |
6861 | } | |
6862 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
395927a9 FDBM |
6863 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { |
6864 | struct btrfs_dev_item *dev_item; | |
6865 | dev_item = btrfs_item_ptr(leaf, slot, | |
0b86a832 | 6866 | struct btrfs_dev_item); |
2ff7e61e | 6867 | ret = read_one_dev(fs_info, leaf, dev_item); |
395927a9 FDBM |
6868 | if (ret) |
6869 | goto error; | |
99e3ecfc | 6870 | total_dev++; |
0b86a832 CM |
6871 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { |
6872 | struct btrfs_chunk *chunk; | |
6873 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
2ff7e61e | 6874 | ret = read_one_chunk(fs_info, &found_key, leaf, chunk); |
2b82032c YZ |
6875 | if (ret) |
6876 | goto error; | |
0b86a832 CM |
6877 | } |
6878 | path->slots[0]++; | |
6879 | } | |
99e3ecfc LB |
6880 | |
6881 | /* | |
6882 | * After loading chunk tree, we've got all device information, | |
6883 | * do another round of validation checks. | |
6884 | */ | |
0b246afa JM |
6885 | if (total_dev != fs_info->fs_devices->total_devices) { |
6886 | btrfs_err(fs_info, | |
99e3ecfc | 6887 | "super_num_devices %llu mismatch with num_devices %llu found here", |
0b246afa | 6888 | btrfs_super_num_devices(fs_info->super_copy), |
99e3ecfc LB |
6889 | total_dev); |
6890 | ret = -EINVAL; | |
6891 | goto error; | |
6892 | } | |
0b246afa JM |
6893 | if (btrfs_super_total_bytes(fs_info->super_copy) < |
6894 | fs_info->fs_devices->total_rw_bytes) { | |
6895 | btrfs_err(fs_info, | |
99e3ecfc | 6896 | "super_total_bytes %llu mismatch with fs_devices total_rw_bytes %llu", |
0b246afa JM |
6897 | btrfs_super_total_bytes(fs_info->super_copy), |
6898 | fs_info->fs_devices->total_rw_bytes); | |
99e3ecfc LB |
6899 | ret = -EINVAL; |
6900 | goto error; | |
6901 | } | |
0b86a832 CM |
6902 | ret = 0; |
6903 | error: | |
34441361 | 6904 | mutex_unlock(&fs_info->chunk_mutex); |
b367e47f LZ |
6905 | mutex_unlock(&uuid_mutex); |
6906 | ||
2b82032c | 6907 | btrfs_free_path(path); |
0b86a832 CM |
6908 | return ret; |
6909 | } | |
442a4f63 | 6910 | |
cb517eab MX |
6911 | void btrfs_init_devices_late(struct btrfs_fs_info *fs_info) |
6912 | { | |
6913 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6914 | struct btrfs_device *device; | |
6915 | ||
29cc83f6 LB |
6916 | while (fs_devices) { |
6917 | mutex_lock(&fs_devices->device_list_mutex); | |
6918 | list_for_each_entry(device, &fs_devices->devices, dev_list) | |
fb456252 | 6919 | device->fs_info = fs_info; |
29cc83f6 LB |
6920 | mutex_unlock(&fs_devices->device_list_mutex); |
6921 | ||
6922 | fs_devices = fs_devices->seed; | |
6923 | } | |
cb517eab MX |
6924 | } |
6925 | ||
733f4fbb SB |
6926 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev) |
6927 | { | |
6928 | int i; | |
6929 | ||
6930 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6931 | btrfs_dev_stat_reset(dev, i); | |
6932 | } | |
6933 | ||
6934 | int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info) | |
6935 | { | |
6936 | struct btrfs_key key; | |
6937 | struct btrfs_key found_key; | |
6938 | struct btrfs_root *dev_root = fs_info->dev_root; | |
6939 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6940 | struct extent_buffer *eb; | |
6941 | int slot; | |
6942 | int ret = 0; | |
6943 | struct btrfs_device *device; | |
6944 | struct btrfs_path *path = NULL; | |
6945 | int i; | |
6946 | ||
6947 | path = btrfs_alloc_path(); | |
6948 | if (!path) { | |
6949 | ret = -ENOMEM; | |
6950 | goto out; | |
6951 | } | |
6952 | ||
6953 | mutex_lock(&fs_devices->device_list_mutex); | |
6954 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
6955 | int item_size; | |
6956 | struct btrfs_dev_stats_item *ptr; | |
6957 | ||
242e2956 DS |
6958 | key.objectid = BTRFS_DEV_STATS_OBJECTID; |
6959 | key.type = BTRFS_PERSISTENT_ITEM_KEY; | |
733f4fbb SB |
6960 | key.offset = device->devid; |
6961 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
6962 | if (ret) { | |
733f4fbb SB |
6963 | __btrfs_reset_dev_stats(device); |
6964 | device->dev_stats_valid = 1; | |
6965 | btrfs_release_path(path); | |
6966 | continue; | |
6967 | } | |
6968 | slot = path->slots[0]; | |
6969 | eb = path->nodes[0]; | |
6970 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
6971 | item_size = btrfs_item_size_nr(eb, slot); | |
6972 | ||
6973 | ptr = btrfs_item_ptr(eb, slot, | |
6974 | struct btrfs_dev_stats_item); | |
6975 | ||
6976 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { | |
6977 | if (item_size >= (1 + i) * sizeof(__le64)) | |
6978 | btrfs_dev_stat_set(device, i, | |
6979 | btrfs_dev_stats_value(eb, ptr, i)); | |
6980 | else | |
6981 | btrfs_dev_stat_reset(device, i); | |
6982 | } | |
6983 | ||
6984 | device->dev_stats_valid = 1; | |
6985 | btrfs_dev_stat_print_on_load(device); | |
6986 | btrfs_release_path(path); | |
6987 | } | |
6988 | mutex_unlock(&fs_devices->device_list_mutex); | |
6989 | ||
6990 | out: | |
6991 | btrfs_free_path(path); | |
6992 | return ret < 0 ? ret : 0; | |
6993 | } | |
6994 | ||
6995 | static int update_dev_stat_item(struct btrfs_trans_handle *trans, | |
6bccf3ab | 6996 | struct btrfs_fs_info *fs_info, |
733f4fbb SB |
6997 | struct btrfs_device *device) |
6998 | { | |
6bccf3ab | 6999 | struct btrfs_root *dev_root = fs_info->dev_root; |
733f4fbb SB |
7000 | struct btrfs_path *path; |
7001 | struct btrfs_key key; | |
7002 | struct extent_buffer *eb; | |
7003 | struct btrfs_dev_stats_item *ptr; | |
7004 | int ret; | |
7005 | int i; | |
7006 | ||
242e2956 DS |
7007 | key.objectid = BTRFS_DEV_STATS_OBJECTID; |
7008 | key.type = BTRFS_PERSISTENT_ITEM_KEY; | |
733f4fbb SB |
7009 | key.offset = device->devid; |
7010 | ||
7011 | path = btrfs_alloc_path(); | |
fa252992 DS |
7012 | if (!path) |
7013 | return -ENOMEM; | |
733f4fbb SB |
7014 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); |
7015 | if (ret < 0) { | |
0b246afa | 7016 | btrfs_warn_in_rcu(fs_info, |
ecaeb14b | 7017 | "error %d while searching for dev_stats item for device %s", |
606686ee | 7018 | ret, rcu_str_deref(device->name)); |
733f4fbb SB |
7019 | goto out; |
7020 | } | |
7021 | ||
7022 | if (ret == 0 && | |
7023 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
7024 | /* need to delete old one and insert a new one */ | |
7025 | ret = btrfs_del_item(trans, dev_root, path); | |
7026 | if (ret != 0) { | |
0b246afa | 7027 | btrfs_warn_in_rcu(fs_info, |
ecaeb14b | 7028 | "delete too small dev_stats item for device %s failed %d", |
606686ee | 7029 | rcu_str_deref(device->name), ret); |
733f4fbb SB |
7030 | goto out; |
7031 | } | |
7032 | ret = 1; | |
7033 | } | |
7034 | ||
7035 | if (ret == 1) { | |
7036 | /* need to insert a new item */ | |
7037 | btrfs_release_path(path); | |
7038 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
7039 | &key, sizeof(*ptr)); | |
7040 | if (ret < 0) { | |
0b246afa | 7041 | btrfs_warn_in_rcu(fs_info, |
ecaeb14b DS |
7042 | "insert dev_stats item for device %s failed %d", |
7043 | rcu_str_deref(device->name), ret); | |
733f4fbb SB |
7044 | goto out; |
7045 | } | |
7046 | } | |
7047 | ||
7048 | eb = path->nodes[0]; | |
7049 | ptr = btrfs_item_ptr(eb, path->slots[0], struct btrfs_dev_stats_item); | |
7050 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
7051 | btrfs_set_dev_stats_value(eb, ptr, i, | |
7052 | btrfs_dev_stat_read(device, i)); | |
7053 | btrfs_mark_buffer_dirty(eb); | |
7054 | ||
7055 | out: | |
7056 | btrfs_free_path(path); | |
7057 | return ret; | |
7058 | } | |
7059 | ||
7060 | /* | |
7061 | * called from commit_transaction. Writes all changed device stats to disk. | |
7062 | */ | |
7063 | int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, | |
7064 | struct btrfs_fs_info *fs_info) | |
7065 | { | |
733f4fbb SB |
7066 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
7067 | struct btrfs_device *device; | |
addc3fa7 | 7068 | int stats_cnt; |
733f4fbb SB |
7069 | int ret = 0; |
7070 | ||
7071 | mutex_lock(&fs_devices->device_list_mutex); | |
7072 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
addc3fa7 | 7073 | if (!device->dev_stats_valid || !btrfs_dev_stats_dirty(device)) |
733f4fbb SB |
7074 | continue; |
7075 | ||
addc3fa7 | 7076 | stats_cnt = atomic_read(&device->dev_stats_ccnt); |
6bccf3ab | 7077 | ret = update_dev_stat_item(trans, fs_info, device); |
733f4fbb | 7078 | if (!ret) |
addc3fa7 | 7079 | atomic_sub(stats_cnt, &device->dev_stats_ccnt); |
733f4fbb SB |
7080 | } |
7081 | mutex_unlock(&fs_devices->device_list_mutex); | |
7082 | ||
7083 | return ret; | |
7084 | } | |
7085 | ||
442a4f63 SB |
7086 | void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index) |
7087 | { | |
7088 | btrfs_dev_stat_inc(dev, index); | |
7089 | btrfs_dev_stat_print_on_error(dev); | |
7090 | } | |
7091 | ||
48a3b636 | 7092 | static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev) |
442a4f63 | 7093 | { |
733f4fbb SB |
7094 | if (!dev->dev_stats_valid) |
7095 | return; | |
fb456252 | 7096 | btrfs_err_rl_in_rcu(dev->fs_info, |
b14af3b4 | 7097 | "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u", |
606686ee | 7098 | rcu_str_deref(dev->name), |
442a4f63 SB |
7099 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
7100 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
7101 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
efe120a0 FH |
7102 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS), |
7103 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
442a4f63 | 7104 | } |
c11d2c23 | 7105 | |
733f4fbb SB |
7106 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev) |
7107 | { | |
a98cdb85 SB |
7108 | int i; |
7109 | ||
7110 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
7111 | if (btrfs_dev_stat_read(dev, i) != 0) | |
7112 | break; | |
7113 | if (i == BTRFS_DEV_STAT_VALUES_MAX) | |
7114 | return; /* all values == 0, suppress message */ | |
7115 | ||
fb456252 | 7116 | btrfs_info_in_rcu(dev->fs_info, |
ecaeb14b | 7117 | "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u", |
606686ee | 7118 | rcu_str_deref(dev->name), |
733f4fbb SB |
7119 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
7120 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
7121 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
7122 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS), | |
7123 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
7124 | } | |
7125 | ||
2ff7e61e | 7126 | int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info, |
b27f7c0c | 7127 | struct btrfs_ioctl_get_dev_stats *stats) |
c11d2c23 SB |
7128 | { |
7129 | struct btrfs_device *dev; | |
0b246afa | 7130 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
c11d2c23 SB |
7131 | int i; |
7132 | ||
7133 | mutex_lock(&fs_devices->device_list_mutex); | |
0b246afa | 7134 | dev = btrfs_find_device(fs_info, stats->devid, NULL, NULL); |
c11d2c23 SB |
7135 | mutex_unlock(&fs_devices->device_list_mutex); |
7136 | ||
7137 | if (!dev) { | |
0b246afa | 7138 | btrfs_warn(fs_info, "get dev_stats failed, device not found"); |
c11d2c23 | 7139 | return -ENODEV; |
733f4fbb | 7140 | } else if (!dev->dev_stats_valid) { |
0b246afa | 7141 | btrfs_warn(fs_info, "get dev_stats failed, not yet valid"); |
733f4fbb | 7142 | return -ENODEV; |
b27f7c0c | 7143 | } else if (stats->flags & BTRFS_DEV_STATS_RESET) { |
c11d2c23 SB |
7144 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { |
7145 | if (stats->nr_items > i) | |
7146 | stats->values[i] = | |
7147 | btrfs_dev_stat_read_and_reset(dev, i); | |
7148 | else | |
7149 | btrfs_dev_stat_reset(dev, i); | |
7150 | } | |
7151 | } else { | |
7152 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
7153 | if (stats->nr_items > i) | |
7154 | stats->values[i] = btrfs_dev_stat_read(dev, i); | |
7155 | } | |
7156 | if (stats->nr_items > BTRFS_DEV_STAT_VALUES_MAX) | |
7157 | stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX; | |
7158 | return 0; | |
7159 | } | |
a8a6dab7 | 7160 | |
da353f6b | 7161 | void btrfs_scratch_superblocks(struct block_device *bdev, const char *device_path) |
a8a6dab7 SB |
7162 | { |
7163 | struct buffer_head *bh; | |
7164 | struct btrfs_super_block *disk_super; | |
12b1c263 | 7165 | int copy_num; |
a8a6dab7 | 7166 | |
12b1c263 AJ |
7167 | if (!bdev) |
7168 | return; | |
a8a6dab7 | 7169 | |
12b1c263 AJ |
7170 | for (copy_num = 0; copy_num < BTRFS_SUPER_MIRROR_MAX; |
7171 | copy_num++) { | |
a8a6dab7 | 7172 | |
12b1c263 AJ |
7173 | if (btrfs_read_dev_one_super(bdev, copy_num, &bh)) |
7174 | continue; | |
7175 | ||
7176 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
7177 | ||
7178 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
7179 | set_buffer_dirty(bh); | |
7180 | sync_dirty_buffer(bh); | |
7181 | brelse(bh); | |
7182 | } | |
7183 | ||
7184 | /* Notify udev that device has changed */ | |
7185 | btrfs_kobject_uevent(bdev, KOBJ_CHANGE); | |
7186 | ||
7187 | /* Update ctime/mtime for device path for libblkid */ | |
7188 | update_dev_time(device_path); | |
a8a6dab7 | 7189 | } |
935e5cc9 MX |
7190 | |
7191 | /* | |
7192 | * Update the size of all devices, which is used for writing out the | |
7193 | * super blocks. | |
7194 | */ | |
7195 | void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info) | |
7196 | { | |
7197 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
7198 | struct btrfs_device *curr, *next; | |
7199 | ||
7200 | if (list_empty(&fs_devices->resized_devices)) | |
7201 | return; | |
7202 | ||
7203 | mutex_lock(&fs_devices->device_list_mutex); | |
34441361 | 7204 | mutex_lock(&fs_info->chunk_mutex); |
935e5cc9 MX |
7205 | list_for_each_entry_safe(curr, next, &fs_devices->resized_devices, |
7206 | resized_list) { | |
7207 | list_del_init(&curr->resized_list); | |
7208 | curr->commit_total_bytes = curr->disk_total_bytes; | |
7209 | } | |
34441361 | 7210 | mutex_unlock(&fs_info->chunk_mutex); |
935e5cc9 MX |
7211 | mutex_unlock(&fs_devices->device_list_mutex); |
7212 | } | |
ce7213c7 MX |
7213 | |
7214 | /* Must be invoked during the transaction commit */ | |
2ff7e61e | 7215 | void btrfs_update_commit_device_bytes_used(struct btrfs_fs_info *fs_info, |
ce7213c7 MX |
7216 | struct btrfs_transaction *transaction) |
7217 | { | |
7218 | struct extent_map *em; | |
7219 | struct map_lookup *map; | |
7220 | struct btrfs_device *dev; | |
7221 | int i; | |
7222 | ||
7223 | if (list_empty(&transaction->pending_chunks)) | |
7224 | return; | |
7225 | ||
7226 | /* In order to kick the device replace finish process */ | |
34441361 | 7227 | mutex_lock(&fs_info->chunk_mutex); |
ce7213c7 | 7228 | list_for_each_entry(em, &transaction->pending_chunks, list) { |
95617d69 | 7229 | map = em->map_lookup; |
ce7213c7 MX |
7230 | |
7231 | for (i = 0; i < map->num_stripes; i++) { | |
7232 | dev = map->stripes[i].dev; | |
7233 | dev->commit_bytes_used = dev->bytes_used; | |
7234 | } | |
7235 | } | |
34441361 | 7236 | mutex_unlock(&fs_info->chunk_mutex); |
ce7213c7 | 7237 | } |
5a13f430 AJ |
7238 | |
7239 | void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info) | |
7240 | { | |
7241 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
7242 | while (fs_devices) { | |
7243 | fs_devices->fs_info = fs_info; | |
7244 | fs_devices = fs_devices->seed; | |
7245 | } | |
7246 | } | |
7247 | ||
7248 | void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info) | |
7249 | { | |
7250 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
7251 | while (fs_devices) { | |
7252 | fs_devices->fs_info = NULL; | |
7253 | fs_devices = fs_devices->seed; | |
7254 | } | |
7255 | } |