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> |
788f20eb | 23 | #include <linux/random.h> |
b765ead5 | 24 | #include <linux/iocontext.h> |
6f88a440 | 25 | #include <linux/capability.h> |
593060d7 | 26 | #include <asm/div64.h> |
4b4e25f2 | 27 | #include "compat.h" |
0b86a832 CM |
28 | #include "ctree.h" |
29 | #include "extent_map.h" | |
30 | #include "disk-io.h" | |
31 | #include "transaction.h" | |
32 | #include "print-tree.h" | |
33 | #include "volumes.h" | |
8b712842 | 34 | #include "async-thread.h" |
0b86a832 | 35 | |
2b82032c YZ |
36 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
37 | struct btrfs_root *root, | |
38 | struct btrfs_device *device); | |
39 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); | |
40 | ||
8a4b83cc CM |
41 | static DEFINE_MUTEX(uuid_mutex); |
42 | static LIST_HEAD(fs_uuids); | |
43 | ||
7d9eb12c CM |
44 | static void lock_chunks(struct btrfs_root *root) |
45 | { | |
7d9eb12c CM |
46 | mutex_lock(&root->fs_info->chunk_mutex); |
47 | } | |
48 | ||
49 | static void unlock_chunks(struct btrfs_root *root) | |
50 | { | |
7d9eb12c CM |
51 | mutex_unlock(&root->fs_info->chunk_mutex); |
52 | } | |
53 | ||
e4404d6e YZ |
54 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
55 | { | |
56 | struct btrfs_device *device; | |
57 | WARN_ON(fs_devices->opened); | |
58 | while (!list_empty(&fs_devices->devices)) { | |
59 | device = list_entry(fs_devices->devices.next, | |
60 | struct btrfs_device, dev_list); | |
61 | list_del(&device->dev_list); | |
62 | kfree(device->name); | |
63 | kfree(device); | |
64 | } | |
65 | kfree(fs_devices); | |
66 | } | |
67 | ||
8a4b83cc CM |
68 | int btrfs_cleanup_fs_uuids(void) |
69 | { | |
70 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 71 | |
2b82032c YZ |
72 | while (!list_empty(&fs_uuids)) { |
73 | fs_devices = list_entry(fs_uuids.next, | |
74 | struct btrfs_fs_devices, list); | |
75 | list_del(&fs_devices->list); | |
e4404d6e | 76 | free_fs_devices(fs_devices); |
8a4b83cc CM |
77 | } |
78 | return 0; | |
79 | } | |
80 | ||
a1b32a59 CM |
81 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
82 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
83 | { |
84 | struct btrfs_device *dev; | |
8a4b83cc | 85 | |
c6e30871 | 86 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 87 | if (dev->devid == devid && |
8f18cf13 | 88 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 89 | return dev; |
a443755f | 90 | } |
8a4b83cc CM |
91 | } |
92 | return NULL; | |
93 | } | |
94 | ||
a1b32a59 | 95 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 96 | { |
8a4b83cc CM |
97 | struct btrfs_fs_devices *fs_devices; |
98 | ||
c6e30871 | 99 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
100 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
101 | return fs_devices; | |
102 | } | |
103 | return NULL; | |
104 | } | |
105 | ||
ffbd517d CM |
106 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
107 | struct bio *head, struct bio *tail) | |
108 | { | |
109 | ||
110 | struct bio *old_head; | |
111 | ||
112 | old_head = pending_bios->head; | |
113 | pending_bios->head = head; | |
114 | if (pending_bios->tail) | |
115 | tail->bi_next = old_head; | |
116 | else | |
117 | pending_bios->tail = tail; | |
118 | } | |
119 | ||
8b712842 CM |
120 | /* |
121 | * we try to collect pending bios for a device so we don't get a large | |
122 | * number of procs sending bios down to the same device. This greatly | |
123 | * improves the schedulers ability to collect and merge the bios. | |
124 | * | |
125 | * But, it also turns into a long list of bios to process and that is sure | |
126 | * to eventually make the worker thread block. The solution here is to | |
127 | * make some progress and then put this work struct back at the end of | |
128 | * the list if the block device is congested. This way, multiple devices | |
129 | * can make progress from a single worker thread. | |
130 | */ | |
d397712b | 131 | static noinline int run_scheduled_bios(struct btrfs_device *device) |
8b712842 CM |
132 | { |
133 | struct bio *pending; | |
134 | struct backing_dev_info *bdi; | |
b64a2851 | 135 | struct btrfs_fs_info *fs_info; |
ffbd517d | 136 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
137 | struct bio *tail; |
138 | struct bio *cur; | |
139 | int again = 0; | |
ffbd517d | 140 | unsigned long num_run; |
d644d8a1 | 141 | unsigned long batch_run = 0; |
b64a2851 | 142 | unsigned long limit; |
b765ead5 | 143 | unsigned long last_waited = 0; |
d84275c9 | 144 | int force_reg = 0; |
0e588859 | 145 | int sync_pending = 0; |
211588ad CM |
146 | struct blk_plug plug; |
147 | ||
148 | /* | |
149 | * this function runs all the bios we've collected for | |
150 | * a particular device. We don't want to wander off to | |
151 | * another device without first sending all of these down. | |
152 | * So, setup a plug here and finish it off before we return | |
153 | */ | |
154 | blk_start_plug(&plug); | |
8b712842 | 155 | |
bedf762b | 156 | bdi = blk_get_backing_dev_info(device->bdev); |
b64a2851 CM |
157 | fs_info = device->dev_root->fs_info; |
158 | limit = btrfs_async_submit_limit(fs_info); | |
159 | limit = limit * 2 / 3; | |
160 | ||
8b712842 CM |
161 | loop: |
162 | spin_lock(&device->io_lock); | |
163 | ||
a6837051 | 164 | loop_lock: |
d84275c9 | 165 | num_run = 0; |
ffbd517d | 166 | |
8b712842 CM |
167 | /* take all the bios off the list at once and process them |
168 | * later on (without the lock held). But, remember the | |
169 | * tail and other pointers so the bios can be properly reinserted | |
170 | * into the list if we hit congestion | |
171 | */ | |
d84275c9 | 172 | if (!force_reg && device->pending_sync_bios.head) { |
ffbd517d | 173 | pending_bios = &device->pending_sync_bios; |
d84275c9 CM |
174 | force_reg = 1; |
175 | } else { | |
ffbd517d | 176 | pending_bios = &device->pending_bios; |
d84275c9 CM |
177 | force_reg = 0; |
178 | } | |
ffbd517d CM |
179 | |
180 | pending = pending_bios->head; | |
181 | tail = pending_bios->tail; | |
8b712842 | 182 | WARN_ON(pending && !tail); |
8b712842 CM |
183 | |
184 | /* | |
185 | * if pending was null this time around, no bios need processing | |
186 | * at all and we can stop. Otherwise it'll loop back up again | |
187 | * and do an additional check so no bios are missed. | |
188 | * | |
189 | * device->running_pending is used to synchronize with the | |
190 | * schedule_bio code. | |
191 | */ | |
ffbd517d CM |
192 | if (device->pending_sync_bios.head == NULL && |
193 | device->pending_bios.head == NULL) { | |
8b712842 CM |
194 | again = 0; |
195 | device->running_pending = 0; | |
ffbd517d CM |
196 | } else { |
197 | again = 1; | |
198 | device->running_pending = 1; | |
8b712842 | 199 | } |
ffbd517d CM |
200 | |
201 | pending_bios->head = NULL; | |
202 | pending_bios->tail = NULL; | |
203 | ||
8b712842 CM |
204 | spin_unlock(&device->io_lock); |
205 | ||
d397712b | 206 | while (pending) { |
ffbd517d CM |
207 | |
208 | rmb(); | |
d84275c9 CM |
209 | /* we want to work on both lists, but do more bios on the |
210 | * sync list than the regular list | |
211 | */ | |
212 | if ((num_run > 32 && | |
213 | pending_bios != &device->pending_sync_bios && | |
214 | device->pending_sync_bios.head) || | |
215 | (num_run > 64 && pending_bios == &device->pending_sync_bios && | |
216 | device->pending_bios.head)) { | |
ffbd517d CM |
217 | spin_lock(&device->io_lock); |
218 | requeue_list(pending_bios, pending, tail); | |
219 | goto loop_lock; | |
220 | } | |
221 | ||
8b712842 CM |
222 | cur = pending; |
223 | pending = pending->bi_next; | |
224 | cur->bi_next = NULL; | |
b64a2851 CM |
225 | atomic_dec(&fs_info->nr_async_bios); |
226 | ||
227 | if (atomic_read(&fs_info->nr_async_bios) < limit && | |
228 | waitqueue_active(&fs_info->async_submit_wait)) | |
229 | wake_up(&fs_info->async_submit_wait); | |
492bb6de CM |
230 | |
231 | BUG_ON(atomic_read(&cur->bi_cnt) == 0); | |
d644d8a1 | 232 | |
2ab1ba68 CM |
233 | /* |
234 | * if we're doing the sync list, record that our | |
235 | * plug has some sync requests on it | |
236 | * | |
237 | * If we're doing the regular list and there are | |
238 | * sync requests sitting around, unplug before | |
239 | * we add more | |
240 | */ | |
241 | if (pending_bios == &device->pending_sync_bios) { | |
242 | sync_pending = 1; | |
243 | } else if (sync_pending) { | |
244 | blk_finish_plug(&plug); | |
245 | blk_start_plug(&plug); | |
246 | sync_pending = 0; | |
247 | } | |
248 | ||
5ff7ba3a CM |
249 | submit_bio(cur->bi_rw, cur); |
250 | num_run++; | |
251 | batch_run++; | |
7eaceacc | 252 | if (need_resched()) |
ffbd517d | 253 | cond_resched(); |
8b712842 CM |
254 | |
255 | /* | |
256 | * we made progress, there is more work to do and the bdi | |
257 | * is now congested. Back off and let other work structs | |
258 | * run instead | |
259 | */ | |
57fd5a5f | 260 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
5f2cc086 | 261 | fs_info->fs_devices->open_devices > 1) { |
b765ead5 | 262 | struct io_context *ioc; |
8b712842 | 263 | |
b765ead5 CM |
264 | ioc = current->io_context; |
265 | ||
266 | /* | |
267 | * the main goal here is that we don't want to | |
268 | * block if we're going to be able to submit | |
269 | * more requests without blocking. | |
270 | * | |
271 | * This code does two great things, it pokes into | |
272 | * the elevator code from a filesystem _and_ | |
273 | * it makes assumptions about how batching works. | |
274 | */ | |
275 | if (ioc && ioc->nr_batch_requests > 0 && | |
276 | time_before(jiffies, ioc->last_waited + HZ/50UL) && | |
277 | (last_waited == 0 || | |
278 | ioc->last_waited == last_waited)) { | |
279 | /* | |
280 | * we want to go through our batch of | |
281 | * requests and stop. So, we copy out | |
282 | * the ioc->last_waited time and test | |
283 | * against it before looping | |
284 | */ | |
285 | last_waited = ioc->last_waited; | |
7eaceacc | 286 | if (need_resched()) |
ffbd517d | 287 | cond_resched(); |
b765ead5 CM |
288 | continue; |
289 | } | |
8b712842 | 290 | spin_lock(&device->io_lock); |
ffbd517d | 291 | requeue_list(pending_bios, pending, tail); |
a6837051 | 292 | device->running_pending = 1; |
8b712842 CM |
293 | |
294 | spin_unlock(&device->io_lock); | |
295 | btrfs_requeue_work(&device->work); | |
296 | goto done; | |
297 | } | |
d85c8a6f CM |
298 | /* unplug every 64 requests just for good measure */ |
299 | if (batch_run % 64 == 0) { | |
300 | blk_finish_plug(&plug); | |
301 | blk_start_plug(&plug); | |
302 | sync_pending = 0; | |
303 | } | |
8b712842 | 304 | } |
ffbd517d | 305 | |
51684082 CM |
306 | cond_resched(); |
307 | if (again) | |
308 | goto loop; | |
309 | ||
310 | spin_lock(&device->io_lock); | |
311 | if (device->pending_bios.head || device->pending_sync_bios.head) | |
312 | goto loop_lock; | |
313 | spin_unlock(&device->io_lock); | |
314 | ||
8b712842 | 315 | done: |
211588ad | 316 | blk_finish_plug(&plug); |
8b712842 CM |
317 | return 0; |
318 | } | |
319 | ||
b2950863 | 320 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
321 | { |
322 | struct btrfs_device *device; | |
323 | ||
324 | device = container_of(work, struct btrfs_device, work); | |
325 | run_scheduled_bios(device); | |
326 | } | |
327 | ||
a1b32a59 | 328 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
329 | struct btrfs_super_block *disk_super, |
330 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
331 | { | |
332 | struct btrfs_device *device; | |
333 | struct btrfs_fs_devices *fs_devices; | |
334 | u64 found_transid = btrfs_super_generation(disk_super); | |
3a0524dc | 335 | char *name; |
8a4b83cc CM |
336 | |
337 | fs_devices = find_fsid(disk_super->fsid); | |
338 | if (!fs_devices) { | |
515dc322 | 339 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
8a4b83cc CM |
340 | if (!fs_devices) |
341 | return -ENOMEM; | |
342 | INIT_LIST_HEAD(&fs_devices->devices); | |
b3075717 | 343 | INIT_LIST_HEAD(&fs_devices->alloc_list); |
8a4b83cc CM |
344 | list_add(&fs_devices->list, &fs_uuids); |
345 | memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); | |
346 | fs_devices->latest_devid = devid; | |
347 | fs_devices->latest_trans = found_transid; | |
e5e9a520 | 348 | mutex_init(&fs_devices->device_list_mutex); |
8a4b83cc CM |
349 | device = NULL; |
350 | } else { | |
a443755f CM |
351 | device = __find_device(&fs_devices->devices, devid, |
352 | disk_super->dev_item.uuid); | |
8a4b83cc CM |
353 | } |
354 | if (!device) { | |
2b82032c YZ |
355 | if (fs_devices->opened) |
356 | return -EBUSY; | |
357 | ||
8a4b83cc CM |
358 | device = kzalloc(sizeof(*device), GFP_NOFS); |
359 | if (!device) { | |
360 | /* we can safely leave the fs_devices entry around */ | |
361 | return -ENOMEM; | |
362 | } | |
363 | device->devid = devid; | |
8b712842 | 364 | device->work.func = pending_bios_fn; |
a443755f CM |
365 | memcpy(device->uuid, disk_super->dev_item.uuid, |
366 | BTRFS_UUID_SIZE); | |
b248a415 | 367 | spin_lock_init(&device->io_lock); |
8a4b83cc CM |
368 | device->name = kstrdup(path, GFP_NOFS); |
369 | if (!device->name) { | |
370 | kfree(device); | |
371 | return -ENOMEM; | |
372 | } | |
2b82032c | 373 | INIT_LIST_HEAD(&device->dev_alloc_list); |
e5e9a520 | 374 | |
90519d66 AJ |
375 | /* init readahead state */ |
376 | spin_lock_init(&device->reada_lock); | |
377 | device->reada_curr_zone = NULL; | |
378 | atomic_set(&device->reada_in_flight, 0); | |
379 | device->reada_next = 0; | |
380 | INIT_RADIX_TREE(&device->reada_zones, GFP_NOFS & ~__GFP_WAIT); | |
381 | INIT_RADIX_TREE(&device->reada_extents, GFP_NOFS & ~__GFP_WAIT); | |
382 | ||
e5e9a520 | 383 | mutex_lock(&fs_devices->device_list_mutex); |
1f78160c | 384 | list_add_rcu(&device->dev_list, &fs_devices->devices); |
e5e9a520 CM |
385 | mutex_unlock(&fs_devices->device_list_mutex); |
386 | ||
2b82032c | 387 | device->fs_devices = fs_devices; |
8a4b83cc | 388 | fs_devices->num_devices++; |
cd02dca5 | 389 | } else if (!device->name || strcmp(device->name, path)) { |
3a0524dc TH |
390 | name = kstrdup(path, GFP_NOFS); |
391 | if (!name) | |
392 | return -ENOMEM; | |
393 | kfree(device->name); | |
394 | device->name = name; | |
cd02dca5 CM |
395 | if (device->missing) { |
396 | fs_devices->missing_devices--; | |
397 | device->missing = 0; | |
398 | } | |
8a4b83cc CM |
399 | } |
400 | ||
401 | if (found_transid > fs_devices->latest_trans) { | |
402 | fs_devices->latest_devid = devid; | |
403 | fs_devices->latest_trans = found_transid; | |
404 | } | |
8a4b83cc CM |
405 | *fs_devices_ret = fs_devices; |
406 | return 0; | |
407 | } | |
408 | ||
e4404d6e YZ |
409 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
410 | { | |
411 | struct btrfs_fs_devices *fs_devices; | |
412 | struct btrfs_device *device; | |
413 | struct btrfs_device *orig_dev; | |
414 | ||
415 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); | |
416 | if (!fs_devices) | |
417 | return ERR_PTR(-ENOMEM); | |
418 | ||
419 | INIT_LIST_HEAD(&fs_devices->devices); | |
420 | INIT_LIST_HEAD(&fs_devices->alloc_list); | |
421 | INIT_LIST_HEAD(&fs_devices->list); | |
e5e9a520 | 422 | mutex_init(&fs_devices->device_list_mutex); |
e4404d6e YZ |
423 | fs_devices->latest_devid = orig->latest_devid; |
424 | fs_devices->latest_trans = orig->latest_trans; | |
425 | memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid)); | |
426 | ||
46224705 | 427 | /* We have held the volume lock, it is safe to get the devices. */ |
e4404d6e YZ |
428 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
429 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
430 | if (!device) | |
431 | goto error; | |
432 | ||
433 | device->name = kstrdup(orig_dev->name, GFP_NOFS); | |
fd2696f3 JL |
434 | if (!device->name) { |
435 | kfree(device); | |
e4404d6e | 436 | goto error; |
fd2696f3 | 437 | } |
e4404d6e YZ |
438 | |
439 | device->devid = orig_dev->devid; | |
440 | device->work.func = pending_bios_fn; | |
441 | memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid)); | |
e4404d6e YZ |
442 | spin_lock_init(&device->io_lock); |
443 | INIT_LIST_HEAD(&device->dev_list); | |
444 | INIT_LIST_HEAD(&device->dev_alloc_list); | |
445 | ||
446 | list_add(&device->dev_list, &fs_devices->devices); | |
447 | device->fs_devices = fs_devices; | |
448 | fs_devices->num_devices++; | |
449 | } | |
450 | return fs_devices; | |
451 | error: | |
452 | free_fs_devices(fs_devices); | |
453 | return ERR_PTR(-ENOMEM); | |
454 | } | |
455 | ||
dfe25020 CM |
456 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices) |
457 | { | |
c6e30871 | 458 | struct btrfs_device *device, *next; |
dfe25020 CM |
459 | |
460 | mutex_lock(&uuid_mutex); | |
461 | again: | |
46224705 | 462 | /* This is the initialized path, it is safe to release the devices. */ |
c6e30871 | 463 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
2b82032c YZ |
464 | if (device->in_fs_metadata) |
465 | continue; | |
466 | ||
467 | if (device->bdev) { | |
d4d77629 | 468 | blkdev_put(device->bdev, device->mode); |
2b82032c YZ |
469 | device->bdev = NULL; |
470 | fs_devices->open_devices--; | |
471 | } | |
472 | if (device->writeable) { | |
473 | list_del_init(&device->dev_alloc_list); | |
474 | device->writeable = 0; | |
475 | fs_devices->rw_devices--; | |
476 | } | |
e4404d6e YZ |
477 | list_del_init(&device->dev_list); |
478 | fs_devices->num_devices--; | |
479 | kfree(device->name); | |
480 | kfree(device); | |
dfe25020 | 481 | } |
2b82032c YZ |
482 | |
483 | if (fs_devices->seed) { | |
484 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
485 | goto again; |
486 | } | |
487 | ||
dfe25020 CM |
488 | mutex_unlock(&uuid_mutex); |
489 | return 0; | |
490 | } | |
a0af469b | 491 | |
1f78160c XG |
492 | static void __free_device(struct work_struct *work) |
493 | { | |
494 | struct btrfs_device *device; | |
495 | ||
496 | device = container_of(work, struct btrfs_device, rcu_work); | |
497 | ||
498 | if (device->bdev) | |
499 | blkdev_put(device->bdev, device->mode); | |
500 | ||
501 | kfree(device->name); | |
502 | kfree(device); | |
503 | } | |
504 | ||
505 | static void free_device(struct rcu_head *head) | |
506 | { | |
507 | struct btrfs_device *device; | |
508 | ||
509 | device = container_of(head, struct btrfs_device, rcu); | |
510 | ||
511 | INIT_WORK(&device->rcu_work, __free_device); | |
512 | schedule_work(&device->rcu_work); | |
513 | } | |
514 | ||
2b82032c | 515 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 516 | { |
8a4b83cc | 517 | struct btrfs_device *device; |
e4404d6e | 518 | |
2b82032c YZ |
519 | if (--fs_devices->opened > 0) |
520 | return 0; | |
8a4b83cc | 521 | |
c9513edb | 522 | mutex_lock(&fs_devices->device_list_mutex); |
c6e30871 | 523 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
1f78160c XG |
524 | struct btrfs_device *new_device; |
525 | ||
526 | if (device->bdev) | |
a0af469b | 527 | fs_devices->open_devices--; |
1f78160c | 528 | |
2b82032c YZ |
529 | if (device->writeable) { |
530 | list_del_init(&device->dev_alloc_list); | |
531 | fs_devices->rw_devices--; | |
532 | } | |
533 | ||
d5e2003c JB |
534 | if (device->can_discard) |
535 | fs_devices->num_can_discard--; | |
536 | ||
1f78160c XG |
537 | new_device = kmalloc(sizeof(*new_device), GFP_NOFS); |
538 | BUG_ON(!new_device); | |
539 | memcpy(new_device, device, sizeof(*new_device)); | |
540 | new_device->name = kstrdup(device->name, GFP_NOFS); | |
5f3f302a | 541 | BUG_ON(device->name && !new_device->name); |
1f78160c XG |
542 | new_device->bdev = NULL; |
543 | new_device->writeable = 0; | |
544 | new_device->in_fs_metadata = 0; | |
d5e2003c | 545 | new_device->can_discard = 0; |
1f78160c XG |
546 | list_replace_rcu(&device->dev_list, &new_device->dev_list); |
547 | ||
548 | call_rcu(&device->rcu, free_device); | |
8a4b83cc | 549 | } |
c9513edb XG |
550 | mutex_unlock(&fs_devices->device_list_mutex); |
551 | ||
e4404d6e YZ |
552 | WARN_ON(fs_devices->open_devices); |
553 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
554 | fs_devices->opened = 0; |
555 | fs_devices->seeding = 0; | |
2b82032c | 556 | |
8a4b83cc CM |
557 | return 0; |
558 | } | |
559 | ||
2b82032c YZ |
560 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
561 | { | |
e4404d6e | 562 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
563 | int ret; |
564 | ||
565 | mutex_lock(&uuid_mutex); | |
566 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
567 | if (!fs_devices->opened) { |
568 | seed_devices = fs_devices->seed; | |
569 | fs_devices->seed = NULL; | |
570 | } | |
2b82032c | 571 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
572 | |
573 | while (seed_devices) { | |
574 | fs_devices = seed_devices; | |
575 | seed_devices = fs_devices->seed; | |
576 | __btrfs_close_devices(fs_devices); | |
577 | free_fs_devices(fs_devices); | |
578 | } | |
2b82032c YZ |
579 | return ret; |
580 | } | |
581 | ||
e4404d6e YZ |
582 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
583 | fmode_t flags, void *holder) | |
8a4b83cc | 584 | { |
d5e2003c | 585 | struct request_queue *q; |
8a4b83cc CM |
586 | struct block_device *bdev; |
587 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 588 | struct btrfs_device *device; |
a0af469b CM |
589 | struct block_device *latest_bdev = NULL; |
590 | struct buffer_head *bh; | |
591 | struct btrfs_super_block *disk_super; | |
592 | u64 latest_devid = 0; | |
593 | u64 latest_transid = 0; | |
a0af469b | 594 | u64 devid; |
2b82032c | 595 | int seeding = 1; |
a0af469b | 596 | int ret = 0; |
8a4b83cc | 597 | |
d4d77629 TH |
598 | flags |= FMODE_EXCL; |
599 | ||
c6e30871 | 600 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
601 | if (device->bdev) |
602 | continue; | |
dfe25020 CM |
603 | if (!device->name) |
604 | continue; | |
605 | ||
d4d77629 | 606 | bdev = blkdev_get_by_path(device->name, flags, holder); |
8a4b83cc | 607 | if (IS_ERR(bdev)) { |
d397712b | 608 | printk(KERN_INFO "open %s failed\n", device->name); |
a0af469b | 609 | goto error; |
8a4b83cc | 610 | } |
a061fc8d | 611 | set_blocksize(bdev, 4096); |
a0af469b | 612 | |
a512bbf8 | 613 | bh = btrfs_read_dev_super(bdev); |
20bcd649 | 614 | if (!bh) |
a0af469b CM |
615 | goto error_close; |
616 | ||
617 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 618 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
a0af469b CM |
619 | if (devid != device->devid) |
620 | goto error_brelse; | |
621 | ||
2b82032c YZ |
622 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
623 | BTRFS_UUID_SIZE)) | |
624 | goto error_brelse; | |
625 | ||
626 | device->generation = btrfs_super_generation(disk_super); | |
627 | if (!latest_transid || device->generation > latest_transid) { | |
a0af469b | 628 | latest_devid = devid; |
2b82032c | 629 | latest_transid = device->generation; |
a0af469b CM |
630 | latest_bdev = bdev; |
631 | } | |
632 | ||
2b82032c YZ |
633 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
634 | device->writeable = 0; | |
635 | } else { | |
636 | device->writeable = !bdev_read_only(bdev); | |
637 | seeding = 0; | |
638 | } | |
639 | ||
d5e2003c JB |
640 | q = bdev_get_queue(bdev); |
641 | if (blk_queue_discard(q)) { | |
642 | device->can_discard = 1; | |
643 | fs_devices->num_can_discard++; | |
644 | } | |
645 | ||
8a4b83cc | 646 | device->bdev = bdev; |
dfe25020 | 647 | device->in_fs_metadata = 0; |
15916de8 CM |
648 | device->mode = flags; |
649 | ||
c289811c CM |
650 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
651 | fs_devices->rotating = 1; | |
652 | ||
a0af469b | 653 | fs_devices->open_devices++; |
2b82032c YZ |
654 | if (device->writeable) { |
655 | fs_devices->rw_devices++; | |
656 | list_add(&device->dev_alloc_list, | |
657 | &fs_devices->alloc_list); | |
658 | } | |
4f6c9328 | 659 | brelse(bh); |
a0af469b | 660 | continue; |
a061fc8d | 661 | |
a0af469b CM |
662 | error_brelse: |
663 | brelse(bh); | |
664 | error_close: | |
d4d77629 | 665 | blkdev_put(bdev, flags); |
a0af469b CM |
666 | error: |
667 | continue; | |
8a4b83cc | 668 | } |
a0af469b | 669 | if (fs_devices->open_devices == 0) { |
20bcd649 | 670 | ret = -EINVAL; |
a0af469b CM |
671 | goto out; |
672 | } | |
2b82032c YZ |
673 | fs_devices->seeding = seeding; |
674 | fs_devices->opened = 1; | |
a0af469b CM |
675 | fs_devices->latest_bdev = latest_bdev; |
676 | fs_devices->latest_devid = latest_devid; | |
677 | fs_devices->latest_trans = latest_transid; | |
2b82032c | 678 | fs_devices->total_rw_bytes = 0; |
a0af469b | 679 | out: |
2b82032c YZ |
680 | return ret; |
681 | } | |
682 | ||
683 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 684 | fmode_t flags, void *holder) |
2b82032c YZ |
685 | { |
686 | int ret; | |
687 | ||
688 | mutex_lock(&uuid_mutex); | |
689 | if (fs_devices->opened) { | |
e4404d6e YZ |
690 | fs_devices->opened++; |
691 | ret = 0; | |
2b82032c | 692 | } else { |
15916de8 | 693 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 694 | } |
8a4b83cc | 695 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
696 | return ret; |
697 | } | |
698 | ||
97288f2c | 699 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
700 | struct btrfs_fs_devices **fs_devices_ret) |
701 | { | |
702 | struct btrfs_super_block *disk_super; | |
703 | struct block_device *bdev; | |
704 | struct buffer_head *bh; | |
705 | int ret; | |
706 | u64 devid; | |
f2984462 | 707 | u64 transid; |
8a4b83cc CM |
708 | |
709 | mutex_lock(&uuid_mutex); | |
710 | ||
d4d77629 TH |
711 | flags |= FMODE_EXCL; |
712 | bdev = blkdev_get_by_path(path, flags, holder); | |
8a4b83cc CM |
713 | |
714 | if (IS_ERR(bdev)) { | |
8a4b83cc CM |
715 | ret = PTR_ERR(bdev); |
716 | goto error; | |
717 | } | |
718 | ||
719 | ret = set_blocksize(bdev, 4096); | |
720 | if (ret) | |
721 | goto error_close; | |
a512bbf8 | 722 | bh = btrfs_read_dev_super(bdev); |
8a4b83cc | 723 | if (!bh) { |
20b45077 | 724 | ret = -EINVAL; |
8a4b83cc CM |
725 | goto error_close; |
726 | } | |
727 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 728 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
f2984462 | 729 | transid = btrfs_super_generation(disk_super); |
7ae9c09d | 730 | if (disk_super->label[0]) |
d397712b | 731 | printk(KERN_INFO "device label %s ", disk_super->label); |
22b63a29 ID |
732 | else |
733 | printk(KERN_INFO "device fsid %pU ", disk_super->fsid); | |
119e10cf | 734 | printk(KERN_CONT "devid %llu transid %llu %s\n", |
d397712b | 735 | (unsigned long long)devid, (unsigned long long)transid, path); |
8a4b83cc CM |
736 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
737 | ||
8a4b83cc CM |
738 | brelse(bh); |
739 | error_close: | |
d4d77629 | 740 | blkdev_put(bdev, flags); |
8a4b83cc CM |
741 | error: |
742 | mutex_unlock(&uuid_mutex); | |
743 | return ret; | |
744 | } | |
0b86a832 | 745 | |
6d07bcec MX |
746 | /* helper to account the used device space in the range */ |
747 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, | |
748 | u64 end, u64 *length) | |
749 | { | |
750 | struct btrfs_key key; | |
751 | struct btrfs_root *root = device->dev_root; | |
752 | struct btrfs_dev_extent *dev_extent; | |
753 | struct btrfs_path *path; | |
754 | u64 extent_end; | |
755 | int ret; | |
756 | int slot; | |
757 | struct extent_buffer *l; | |
758 | ||
759 | *length = 0; | |
760 | ||
761 | if (start >= device->total_bytes) | |
762 | return 0; | |
763 | ||
764 | path = btrfs_alloc_path(); | |
765 | if (!path) | |
766 | return -ENOMEM; | |
767 | path->reada = 2; | |
768 | ||
769 | key.objectid = device->devid; | |
770 | key.offset = start; | |
771 | key.type = BTRFS_DEV_EXTENT_KEY; | |
772 | ||
773 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
774 | if (ret < 0) | |
775 | goto out; | |
776 | if (ret > 0) { | |
777 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
778 | if (ret < 0) | |
779 | goto out; | |
780 | } | |
781 | ||
782 | while (1) { | |
783 | l = path->nodes[0]; | |
784 | slot = path->slots[0]; | |
785 | if (slot >= btrfs_header_nritems(l)) { | |
786 | ret = btrfs_next_leaf(root, path); | |
787 | if (ret == 0) | |
788 | continue; | |
789 | if (ret < 0) | |
790 | goto out; | |
791 | ||
792 | break; | |
793 | } | |
794 | btrfs_item_key_to_cpu(l, &key, slot); | |
795 | ||
796 | if (key.objectid < device->devid) | |
797 | goto next; | |
798 | ||
799 | if (key.objectid > device->devid) | |
800 | break; | |
801 | ||
802 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) | |
803 | goto next; | |
804 | ||
805 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
806 | extent_end = key.offset + btrfs_dev_extent_length(l, | |
807 | dev_extent); | |
808 | if (key.offset <= start && extent_end > end) { | |
809 | *length = end - start + 1; | |
810 | break; | |
811 | } else if (key.offset <= start && extent_end > start) | |
812 | *length += extent_end - start; | |
813 | else if (key.offset > start && extent_end <= end) | |
814 | *length += extent_end - key.offset; | |
815 | else if (key.offset > start && key.offset <= end) { | |
816 | *length += end - key.offset + 1; | |
817 | break; | |
818 | } else if (key.offset > end) | |
819 | break; | |
820 | ||
821 | next: | |
822 | path->slots[0]++; | |
823 | } | |
824 | ret = 0; | |
825 | out: | |
826 | btrfs_free_path(path); | |
827 | return ret; | |
828 | } | |
829 | ||
0b86a832 | 830 | /* |
7bfc837d MX |
831 | * find_free_dev_extent - find free space in the specified device |
832 | * @trans: transaction handler | |
833 | * @device: the device which we search the free space in | |
834 | * @num_bytes: the size of the free space that we need | |
835 | * @start: store the start of the free space. | |
836 | * @len: the size of the free space. that we find, or the size of the max | |
837 | * free space if we don't find suitable free space | |
838 | * | |
0b86a832 CM |
839 | * this uses a pretty simple search, the expectation is that it is |
840 | * called very infrequently and that a given device has a small number | |
841 | * of extents | |
7bfc837d MX |
842 | * |
843 | * @start is used to store the start of the free space if we find. But if we | |
844 | * don't find suitable free space, it will be used to store the start position | |
845 | * of the max free space. | |
846 | * | |
847 | * @len is used to store the size of the free space that we find. | |
848 | * But if we don't find suitable free space, it is used to store the size of | |
849 | * the max free space. | |
0b86a832 | 850 | */ |
ba1bf481 JB |
851 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
852 | struct btrfs_device *device, u64 num_bytes, | |
7bfc837d | 853 | u64 *start, u64 *len) |
0b86a832 CM |
854 | { |
855 | struct btrfs_key key; | |
856 | struct btrfs_root *root = device->dev_root; | |
7bfc837d | 857 | struct btrfs_dev_extent *dev_extent; |
2b82032c | 858 | struct btrfs_path *path; |
7bfc837d MX |
859 | u64 hole_size; |
860 | u64 max_hole_start; | |
861 | u64 max_hole_size; | |
862 | u64 extent_end; | |
863 | u64 search_start; | |
0b86a832 CM |
864 | u64 search_end = device->total_bytes; |
865 | int ret; | |
7bfc837d | 866 | int slot; |
0b86a832 CM |
867 | struct extent_buffer *l; |
868 | ||
0b86a832 CM |
869 | /* FIXME use last free of some kind */ |
870 | ||
8a4b83cc CM |
871 | /* we don't want to overwrite the superblock on the drive, |
872 | * so we make sure to start at an offset of at least 1MB | |
873 | */ | |
a9c9bf68 | 874 | search_start = max(root->fs_info->alloc_start, 1024ull * 1024); |
8f18cf13 | 875 | |
7bfc837d MX |
876 | max_hole_start = search_start; |
877 | max_hole_size = 0; | |
38c01b96 | 878 | hole_size = 0; |
7bfc837d MX |
879 | |
880 | if (search_start >= search_end) { | |
881 | ret = -ENOSPC; | |
882 | goto error; | |
883 | } | |
884 | ||
885 | path = btrfs_alloc_path(); | |
886 | if (!path) { | |
887 | ret = -ENOMEM; | |
888 | goto error; | |
889 | } | |
890 | path->reada = 2; | |
891 | ||
0b86a832 CM |
892 | key.objectid = device->devid; |
893 | key.offset = search_start; | |
894 | key.type = BTRFS_DEV_EXTENT_KEY; | |
7bfc837d | 895 | |
0b86a832 CM |
896 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); |
897 | if (ret < 0) | |
7bfc837d | 898 | goto out; |
1fcbac58 YZ |
899 | if (ret > 0) { |
900 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
901 | if (ret < 0) | |
7bfc837d | 902 | goto out; |
1fcbac58 | 903 | } |
7bfc837d | 904 | |
0b86a832 CM |
905 | while (1) { |
906 | l = path->nodes[0]; | |
907 | slot = path->slots[0]; | |
908 | if (slot >= btrfs_header_nritems(l)) { | |
909 | ret = btrfs_next_leaf(root, path); | |
910 | if (ret == 0) | |
911 | continue; | |
912 | if (ret < 0) | |
7bfc837d MX |
913 | goto out; |
914 | ||
915 | break; | |
0b86a832 CM |
916 | } |
917 | btrfs_item_key_to_cpu(l, &key, slot); | |
918 | ||
919 | if (key.objectid < device->devid) | |
920 | goto next; | |
921 | ||
922 | if (key.objectid > device->devid) | |
7bfc837d | 923 | break; |
0b86a832 | 924 | |
7bfc837d MX |
925 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) |
926 | goto next; | |
9779b72f | 927 | |
7bfc837d MX |
928 | if (key.offset > search_start) { |
929 | hole_size = key.offset - search_start; | |
9779b72f | 930 | |
7bfc837d MX |
931 | if (hole_size > max_hole_size) { |
932 | max_hole_start = search_start; | |
933 | max_hole_size = hole_size; | |
934 | } | |
9779b72f | 935 | |
7bfc837d MX |
936 | /* |
937 | * If this free space is greater than which we need, | |
938 | * it must be the max free space that we have found | |
939 | * until now, so max_hole_start must point to the start | |
940 | * of this free space and the length of this free space | |
941 | * is stored in max_hole_size. Thus, we return | |
942 | * max_hole_start and max_hole_size and go back to the | |
943 | * caller. | |
944 | */ | |
945 | if (hole_size >= num_bytes) { | |
946 | ret = 0; | |
947 | goto out; | |
0b86a832 CM |
948 | } |
949 | } | |
0b86a832 | 950 | |
0b86a832 | 951 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
7bfc837d MX |
952 | extent_end = key.offset + btrfs_dev_extent_length(l, |
953 | dev_extent); | |
954 | if (extent_end > search_start) | |
955 | search_start = extent_end; | |
0b86a832 CM |
956 | next: |
957 | path->slots[0]++; | |
958 | cond_resched(); | |
959 | } | |
0b86a832 | 960 | |
38c01b96 | 961 | /* |
962 | * At this point, search_start should be the end of | |
963 | * allocated dev extents, and when shrinking the device, | |
964 | * search_end may be smaller than search_start. | |
965 | */ | |
966 | if (search_end > search_start) | |
967 | hole_size = search_end - search_start; | |
968 | ||
7bfc837d MX |
969 | if (hole_size > max_hole_size) { |
970 | max_hole_start = search_start; | |
971 | max_hole_size = hole_size; | |
0b86a832 | 972 | } |
0b86a832 | 973 | |
7bfc837d MX |
974 | /* See above. */ |
975 | if (hole_size < num_bytes) | |
976 | ret = -ENOSPC; | |
977 | else | |
978 | ret = 0; | |
979 | ||
980 | out: | |
2b82032c | 981 | btrfs_free_path(path); |
7bfc837d MX |
982 | error: |
983 | *start = max_hole_start; | |
b2117a39 | 984 | if (len) |
7bfc837d | 985 | *len = max_hole_size; |
0b86a832 CM |
986 | return ret; |
987 | } | |
988 | ||
b2950863 | 989 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
990 | struct btrfs_device *device, |
991 | u64 start) | |
992 | { | |
993 | int ret; | |
994 | struct btrfs_path *path; | |
995 | struct btrfs_root *root = device->dev_root; | |
996 | struct btrfs_key key; | |
a061fc8d CM |
997 | struct btrfs_key found_key; |
998 | struct extent_buffer *leaf = NULL; | |
999 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
1000 | |
1001 | path = btrfs_alloc_path(); | |
1002 | if (!path) | |
1003 | return -ENOMEM; | |
1004 | ||
1005 | key.objectid = device->devid; | |
1006 | key.offset = start; | |
1007 | key.type = BTRFS_DEV_EXTENT_KEY; | |
924cd8fb | 1008 | again: |
8f18cf13 | 1009 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
a061fc8d CM |
1010 | if (ret > 0) { |
1011 | ret = btrfs_previous_item(root, path, key.objectid, | |
1012 | BTRFS_DEV_EXTENT_KEY); | |
b0b802d7 TI |
1013 | if (ret) |
1014 | goto out; | |
a061fc8d CM |
1015 | leaf = path->nodes[0]; |
1016 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1017 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1018 | struct btrfs_dev_extent); | |
1019 | BUG_ON(found_key.offset > start || found_key.offset + | |
1020 | btrfs_dev_extent_length(leaf, extent) < start); | |
924cd8fb MX |
1021 | key = found_key; |
1022 | btrfs_release_path(path); | |
1023 | goto again; | |
a061fc8d CM |
1024 | } else if (ret == 0) { |
1025 | leaf = path->nodes[0]; | |
1026 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1027 | struct btrfs_dev_extent); | |
1028 | } | |
8f18cf13 CM |
1029 | BUG_ON(ret); |
1030 | ||
2bf64758 JB |
1031 | if (device->bytes_used > 0) { |
1032 | u64 len = btrfs_dev_extent_length(leaf, extent); | |
1033 | device->bytes_used -= len; | |
1034 | spin_lock(&root->fs_info->free_chunk_lock); | |
1035 | root->fs_info->free_chunk_space += len; | |
1036 | spin_unlock(&root->fs_info->free_chunk_lock); | |
1037 | } | |
8f18cf13 | 1038 | ret = btrfs_del_item(trans, root, path); |
8f18cf13 | 1039 | |
b0b802d7 | 1040 | out: |
8f18cf13 CM |
1041 | btrfs_free_path(path); |
1042 | return ret; | |
1043 | } | |
1044 | ||
2b82032c | 1045 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
0b86a832 | 1046 | struct btrfs_device *device, |
e17cade2 | 1047 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 1048 | u64 chunk_offset, u64 start, u64 num_bytes) |
0b86a832 CM |
1049 | { |
1050 | int ret; | |
1051 | struct btrfs_path *path; | |
1052 | struct btrfs_root *root = device->dev_root; | |
1053 | struct btrfs_dev_extent *extent; | |
1054 | struct extent_buffer *leaf; | |
1055 | struct btrfs_key key; | |
1056 | ||
dfe25020 | 1057 | WARN_ON(!device->in_fs_metadata); |
0b86a832 CM |
1058 | path = btrfs_alloc_path(); |
1059 | if (!path) | |
1060 | return -ENOMEM; | |
1061 | ||
0b86a832 | 1062 | key.objectid = device->devid; |
2b82032c | 1063 | key.offset = start; |
0b86a832 CM |
1064 | key.type = BTRFS_DEV_EXTENT_KEY; |
1065 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1066 | sizeof(*extent)); | |
1067 | BUG_ON(ret); | |
1068 | ||
1069 | leaf = path->nodes[0]; | |
1070 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1071 | struct btrfs_dev_extent); | |
e17cade2 CM |
1072 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
1073 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
1074 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
1075 | ||
1076 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
1077 | (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), | |
1078 | BTRFS_UUID_SIZE); | |
1079 | ||
0b86a832 CM |
1080 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
1081 | btrfs_mark_buffer_dirty(leaf); | |
0b86a832 CM |
1082 | btrfs_free_path(path); |
1083 | return ret; | |
1084 | } | |
1085 | ||
a1b32a59 CM |
1086 | static noinline int find_next_chunk(struct btrfs_root *root, |
1087 | u64 objectid, u64 *offset) | |
0b86a832 CM |
1088 | { |
1089 | struct btrfs_path *path; | |
1090 | int ret; | |
1091 | struct btrfs_key key; | |
e17cade2 | 1092 | struct btrfs_chunk *chunk; |
0b86a832 CM |
1093 | struct btrfs_key found_key; |
1094 | ||
1095 | path = btrfs_alloc_path(); | |
92b8e897 MF |
1096 | if (!path) |
1097 | return -ENOMEM; | |
0b86a832 | 1098 | |
e17cade2 | 1099 | key.objectid = objectid; |
0b86a832 CM |
1100 | key.offset = (u64)-1; |
1101 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1102 | ||
1103 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1104 | if (ret < 0) | |
1105 | goto error; | |
1106 | ||
1107 | BUG_ON(ret == 0); | |
1108 | ||
1109 | ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY); | |
1110 | if (ret) { | |
e17cade2 | 1111 | *offset = 0; |
0b86a832 CM |
1112 | } else { |
1113 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1114 | path->slots[0]); | |
e17cade2 CM |
1115 | if (found_key.objectid != objectid) |
1116 | *offset = 0; | |
1117 | else { | |
1118 | chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1119 | struct btrfs_chunk); | |
1120 | *offset = found_key.offset + | |
1121 | btrfs_chunk_length(path->nodes[0], chunk); | |
1122 | } | |
0b86a832 CM |
1123 | } |
1124 | ret = 0; | |
1125 | error: | |
1126 | btrfs_free_path(path); | |
1127 | return ret; | |
1128 | } | |
1129 | ||
2b82032c | 1130 | static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid) |
0b86a832 CM |
1131 | { |
1132 | int ret; | |
1133 | struct btrfs_key key; | |
1134 | struct btrfs_key found_key; | |
2b82032c YZ |
1135 | struct btrfs_path *path; |
1136 | ||
1137 | root = root->fs_info->chunk_root; | |
1138 | ||
1139 | path = btrfs_alloc_path(); | |
1140 | if (!path) | |
1141 | return -ENOMEM; | |
0b86a832 CM |
1142 | |
1143 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1144 | key.type = BTRFS_DEV_ITEM_KEY; | |
1145 | key.offset = (u64)-1; | |
1146 | ||
1147 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1148 | if (ret < 0) | |
1149 | goto error; | |
1150 | ||
1151 | BUG_ON(ret == 0); | |
1152 | ||
1153 | ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID, | |
1154 | BTRFS_DEV_ITEM_KEY); | |
1155 | if (ret) { | |
1156 | *objectid = 1; | |
1157 | } else { | |
1158 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1159 | path->slots[0]); | |
1160 | *objectid = found_key.offset + 1; | |
1161 | } | |
1162 | ret = 0; | |
1163 | error: | |
2b82032c | 1164 | btrfs_free_path(path); |
0b86a832 CM |
1165 | return ret; |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * the device information is stored in the chunk root | |
1170 | * the btrfs_device struct should be fully filled in | |
1171 | */ | |
1172 | int btrfs_add_device(struct btrfs_trans_handle *trans, | |
1173 | struct btrfs_root *root, | |
1174 | struct btrfs_device *device) | |
1175 | { | |
1176 | int ret; | |
1177 | struct btrfs_path *path; | |
1178 | struct btrfs_dev_item *dev_item; | |
1179 | struct extent_buffer *leaf; | |
1180 | struct btrfs_key key; | |
1181 | unsigned long ptr; | |
0b86a832 CM |
1182 | |
1183 | root = root->fs_info->chunk_root; | |
1184 | ||
1185 | path = btrfs_alloc_path(); | |
1186 | if (!path) | |
1187 | return -ENOMEM; | |
1188 | ||
0b86a832 CM |
1189 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1190 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 1191 | key.offset = device->devid; |
0b86a832 CM |
1192 | |
1193 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 1194 | sizeof(*dev_item)); |
0b86a832 CM |
1195 | if (ret) |
1196 | goto out; | |
1197 | ||
1198 | leaf = path->nodes[0]; | |
1199 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1200 | ||
1201 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 1202 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
1203 | btrfs_set_device_type(leaf, dev_item, device->type); |
1204 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1205 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1206 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
1207 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
1208 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
e17cade2 CM |
1209 | btrfs_set_device_group(leaf, dev_item, 0); |
1210 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
1211 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 1212 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 1213 | |
0b86a832 | 1214 | ptr = (unsigned long)btrfs_device_uuid(dev_item); |
e17cade2 | 1215 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
2b82032c YZ |
1216 | ptr = (unsigned long)btrfs_device_fsid(dev_item); |
1217 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); | |
0b86a832 | 1218 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 1219 | |
2b82032c | 1220 | ret = 0; |
0b86a832 CM |
1221 | out: |
1222 | btrfs_free_path(path); | |
1223 | return ret; | |
1224 | } | |
8f18cf13 | 1225 | |
a061fc8d CM |
1226 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
1227 | struct btrfs_device *device) | |
1228 | { | |
1229 | int ret; | |
1230 | struct btrfs_path *path; | |
a061fc8d | 1231 | struct btrfs_key key; |
a061fc8d CM |
1232 | struct btrfs_trans_handle *trans; |
1233 | ||
1234 | root = root->fs_info->chunk_root; | |
1235 | ||
1236 | path = btrfs_alloc_path(); | |
1237 | if (!path) | |
1238 | return -ENOMEM; | |
1239 | ||
a22285a6 | 1240 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1241 | if (IS_ERR(trans)) { |
1242 | btrfs_free_path(path); | |
1243 | return PTR_ERR(trans); | |
1244 | } | |
a061fc8d CM |
1245 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1246 | key.type = BTRFS_DEV_ITEM_KEY; | |
1247 | key.offset = device->devid; | |
7d9eb12c | 1248 | lock_chunks(root); |
a061fc8d CM |
1249 | |
1250 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1251 | if (ret < 0) | |
1252 | goto out; | |
1253 | ||
1254 | if (ret > 0) { | |
1255 | ret = -ENOENT; | |
1256 | goto out; | |
1257 | } | |
1258 | ||
1259 | ret = btrfs_del_item(trans, root, path); | |
1260 | if (ret) | |
1261 | goto out; | |
a061fc8d CM |
1262 | out: |
1263 | btrfs_free_path(path); | |
7d9eb12c | 1264 | unlock_chunks(root); |
a061fc8d CM |
1265 | btrfs_commit_transaction(trans, root); |
1266 | return ret; | |
1267 | } | |
1268 | ||
1269 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
1270 | { | |
1271 | struct btrfs_device *device; | |
2b82032c | 1272 | struct btrfs_device *next_device; |
a061fc8d | 1273 | struct block_device *bdev; |
dfe25020 | 1274 | struct buffer_head *bh = NULL; |
a061fc8d | 1275 | struct btrfs_super_block *disk_super; |
1f78160c | 1276 | struct btrfs_fs_devices *cur_devices; |
a061fc8d CM |
1277 | u64 all_avail; |
1278 | u64 devid; | |
2b82032c YZ |
1279 | u64 num_devices; |
1280 | u8 *dev_uuid; | |
a061fc8d | 1281 | int ret = 0; |
1f78160c | 1282 | bool clear_super = false; |
a061fc8d | 1283 | |
a061fc8d | 1284 | mutex_lock(&uuid_mutex); |
7d9eb12c | 1285 | mutex_lock(&root->fs_info->volume_mutex); |
a061fc8d CM |
1286 | |
1287 | all_avail = root->fs_info->avail_data_alloc_bits | | |
1288 | root->fs_info->avail_system_alloc_bits | | |
1289 | root->fs_info->avail_metadata_alloc_bits; | |
1290 | ||
1291 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && | |
035fe03a | 1292 | root->fs_info->fs_devices->num_devices <= 4) { |
d397712b CM |
1293 | printk(KERN_ERR "btrfs: unable to go below four devices " |
1294 | "on raid10\n"); | |
a061fc8d CM |
1295 | ret = -EINVAL; |
1296 | goto out; | |
1297 | } | |
1298 | ||
1299 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && | |
035fe03a | 1300 | root->fs_info->fs_devices->num_devices <= 2) { |
d397712b CM |
1301 | printk(KERN_ERR "btrfs: unable to go below two " |
1302 | "devices on raid1\n"); | |
a061fc8d CM |
1303 | ret = -EINVAL; |
1304 | goto out; | |
1305 | } | |
1306 | ||
dfe25020 | 1307 | if (strcmp(device_path, "missing") == 0) { |
dfe25020 CM |
1308 | struct list_head *devices; |
1309 | struct btrfs_device *tmp; | |
a061fc8d | 1310 | |
dfe25020 CM |
1311 | device = NULL; |
1312 | devices = &root->fs_info->fs_devices->devices; | |
46224705 XG |
1313 | /* |
1314 | * It is safe to read the devices since the volume_mutex | |
1315 | * is held. | |
1316 | */ | |
c6e30871 | 1317 | list_for_each_entry(tmp, devices, dev_list) { |
dfe25020 CM |
1318 | if (tmp->in_fs_metadata && !tmp->bdev) { |
1319 | device = tmp; | |
1320 | break; | |
1321 | } | |
1322 | } | |
1323 | bdev = NULL; | |
1324 | bh = NULL; | |
1325 | disk_super = NULL; | |
1326 | if (!device) { | |
d397712b CM |
1327 | printk(KERN_ERR "btrfs: no missing devices found to " |
1328 | "remove\n"); | |
dfe25020 CM |
1329 | goto out; |
1330 | } | |
dfe25020 | 1331 | } else { |
d4d77629 TH |
1332 | bdev = blkdev_get_by_path(device_path, FMODE_READ | FMODE_EXCL, |
1333 | root->fs_info->bdev_holder); | |
dfe25020 CM |
1334 | if (IS_ERR(bdev)) { |
1335 | ret = PTR_ERR(bdev); | |
1336 | goto out; | |
1337 | } | |
a061fc8d | 1338 | |
2b82032c | 1339 | set_blocksize(bdev, 4096); |
a512bbf8 | 1340 | bh = btrfs_read_dev_super(bdev); |
dfe25020 | 1341 | if (!bh) { |
20b45077 | 1342 | ret = -EINVAL; |
dfe25020 CM |
1343 | goto error_close; |
1344 | } | |
1345 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 1346 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
2b82032c YZ |
1347 | dev_uuid = disk_super->dev_item.uuid; |
1348 | device = btrfs_find_device(root, devid, dev_uuid, | |
1349 | disk_super->fsid); | |
dfe25020 CM |
1350 | if (!device) { |
1351 | ret = -ENOENT; | |
1352 | goto error_brelse; | |
1353 | } | |
2b82032c | 1354 | } |
dfe25020 | 1355 | |
2b82032c | 1356 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
d397712b CM |
1357 | printk(KERN_ERR "btrfs: unable to remove the only writeable " |
1358 | "device\n"); | |
2b82032c YZ |
1359 | ret = -EINVAL; |
1360 | goto error_brelse; | |
1361 | } | |
1362 | ||
1363 | if (device->writeable) { | |
0c1daee0 | 1364 | lock_chunks(root); |
2b82032c | 1365 | list_del_init(&device->dev_alloc_list); |
0c1daee0 | 1366 | unlock_chunks(root); |
2b82032c | 1367 | root->fs_info->fs_devices->rw_devices--; |
1f78160c | 1368 | clear_super = true; |
dfe25020 | 1369 | } |
a061fc8d CM |
1370 | |
1371 | ret = btrfs_shrink_device(device, 0); | |
1372 | if (ret) | |
9b3517e9 | 1373 | goto error_undo; |
a061fc8d | 1374 | |
a061fc8d CM |
1375 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
1376 | if (ret) | |
9b3517e9 | 1377 | goto error_undo; |
a061fc8d | 1378 | |
2bf64758 JB |
1379 | spin_lock(&root->fs_info->free_chunk_lock); |
1380 | root->fs_info->free_chunk_space = device->total_bytes - | |
1381 | device->bytes_used; | |
1382 | spin_unlock(&root->fs_info->free_chunk_lock); | |
1383 | ||
2b82032c | 1384 | device->in_fs_metadata = 0; |
a2de733c | 1385 | btrfs_scrub_cancel_dev(root, device); |
e5e9a520 CM |
1386 | |
1387 | /* | |
1388 | * the device list mutex makes sure that we don't change | |
1389 | * the device list while someone else is writing out all | |
1390 | * the device supers. | |
1391 | */ | |
1f78160c XG |
1392 | |
1393 | cur_devices = device->fs_devices; | |
e5e9a520 | 1394 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
1f78160c | 1395 | list_del_rcu(&device->dev_list); |
e5e9a520 | 1396 | |
e4404d6e | 1397 | device->fs_devices->num_devices--; |
2b82032c | 1398 | |
cd02dca5 CM |
1399 | if (device->missing) |
1400 | root->fs_info->fs_devices->missing_devices--; | |
1401 | ||
2b82032c YZ |
1402 | next_device = list_entry(root->fs_info->fs_devices->devices.next, |
1403 | struct btrfs_device, dev_list); | |
1404 | if (device->bdev == root->fs_info->sb->s_bdev) | |
1405 | root->fs_info->sb->s_bdev = next_device->bdev; | |
1406 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) | |
1407 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1408 | ||
1f78160c | 1409 | if (device->bdev) |
e4404d6e | 1410 | device->fs_devices->open_devices--; |
1f78160c XG |
1411 | |
1412 | call_rcu(&device->rcu, free_device); | |
1413 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
e4404d6e | 1414 | |
6c41761f DS |
1415 | num_devices = btrfs_super_num_devices(root->fs_info->super_copy) - 1; |
1416 | btrfs_set_super_num_devices(root->fs_info->super_copy, num_devices); | |
2b82032c | 1417 | |
1f78160c | 1418 | if (cur_devices->open_devices == 0) { |
e4404d6e YZ |
1419 | struct btrfs_fs_devices *fs_devices; |
1420 | fs_devices = root->fs_info->fs_devices; | |
1421 | while (fs_devices) { | |
1f78160c | 1422 | if (fs_devices->seed == cur_devices) |
e4404d6e YZ |
1423 | break; |
1424 | fs_devices = fs_devices->seed; | |
2b82032c | 1425 | } |
1f78160c XG |
1426 | fs_devices->seed = cur_devices->seed; |
1427 | cur_devices->seed = NULL; | |
0c1daee0 | 1428 | lock_chunks(root); |
1f78160c | 1429 | __btrfs_close_devices(cur_devices); |
0c1daee0 | 1430 | unlock_chunks(root); |
1f78160c | 1431 | free_fs_devices(cur_devices); |
2b82032c YZ |
1432 | } |
1433 | ||
1434 | /* | |
1435 | * at this point, the device is zero sized. We want to | |
1436 | * remove it from the devices list and zero out the old super | |
1437 | */ | |
1f78160c | 1438 | if (clear_super) { |
dfe25020 CM |
1439 | /* make sure this device isn't detected as part of |
1440 | * the FS anymore | |
1441 | */ | |
1442 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
1443 | set_buffer_dirty(bh); | |
1444 | sync_dirty_buffer(bh); | |
dfe25020 | 1445 | } |
a061fc8d | 1446 | |
a061fc8d | 1447 | ret = 0; |
a061fc8d CM |
1448 | |
1449 | error_brelse: | |
1450 | brelse(bh); | |
1451 | error_close: | |
dfe25020 | 1452 | if (bdev) |
e525fd89 | 1453 | blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
a061fc8d | 1454 | out: |
7d9eb12c | 1455 | mutex_unlock(&root->fs_info->volume_mutex); |
a061fc8d | 1456 | mutex_unlock(&uuid_mutex); |
a061fc8d | 1457 | return ret; |
9b3517e9 ID |
1458 | error_undo: |
1459 | if (device->writeable) { | |
0c1daee0 | 1460 | lock_chunks(root); |
9b3517e9 ID |
1461 | list_add(&device->dev_alloc_list, |
1462 | &root->fs_info->fs_devices->alloc_list); | |
0c1daee0 | 1463 | unlock_chunks(root); |
9b3517e9 ID |
1464 | root->fs_info->fs_devices->rw_devices++; |
1465 | } | |
1466 | goto error_brelse; | |
a061fc8d CM |
1467 | } |
1468 | ||
2b82032c YZ |
1469 | /* |
1470 | * does all the dirty work required for changing file system's UUID. | |
1471 | */ | |
1472 | static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans, | |
1473 | struct btrfs_root *root) | |
1474 | { | |
1475 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
1476 | struct btrfs_fs_devices *old_devices; | |
e4404d6e | 1477 | struct btrfs_fs_devices *seed_devices; |
6c41761f | 1478 | struct btrfs_super_block *disk_super = root->fs_info->super_copy; |
2b82032c YZ |
1479 | struct btrfs_device *device; |
1480 | u64 super_flags; | |
1481 | ||
1482 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 1483 | if (!fs_devices->seeding) |
2b82032c YZ |
1484 | return -EINVAL; |
1485 | ||
e4404d6e YZ |
1486 | seed_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
1487 | if (!seed_devices) | |
2b82032c YZ |
1488 | return -ENOMEM; |
1489 | ||
e4404d6e YZ |
1490 | old_devices = clone_fs_devices(fs_devices); |
1491 | if (IS_ERR(old_devices)) { | |
1492 | kfree(seed_devices); | |
1493 | return PTR_ERR(old_devices); | |
2b82032c | 1494 | } |
e4404d6e | 1495 | |
2b82032c YZ |
1496 | list_add(&old_devices->list, &fs_uuids); |
1497 | ||
e4404d6e YZ |
1498 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
1499 | seed_devices->opened = 1; | |
1500 | INIT_LIST_HEAD(&seed_devices->devices); | |
1501 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
e5e9a520 | 1502 | mutex_init(&seed_devices->device_list_mutex); |
c9513edb XG |
1503 | |
1504 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c XG |
1505 | list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices, |
1506 | synchronize_rcu); | |
c9513edb XG |
1507 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
1508 | ||
e4404d6e YZ |
1509 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); |
1510 | list_for_each_entry(device, &seed_devices->devices, dev_list) { | |
1511 | device->fs_devices = seed_devices; | |
1512 | } | |
1513 | ||
2b82032c YZ |
1514 | fs_devices->seeding = 0; |
1515 | fs_devices->num_devices = 0; | |
1516 | fs_devices->open_devices = 0; | |
e4404d6e | 1517 | fs_devices->seed = seed_devices; |
2b82032c YZ |
1518 | |
1519 | generate_random_uuid(fs_devices->fsid); | |
1520 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1521 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1522 | super_flags = btrfs_super_flags(disk_super) & | |
1523 | ~BTRFS_SUPER_FLAG_SEEDING; | |
1524 | btrfs_set_super_flags(disk_super, super_flags); | |
1525 | ||
1526 | return 0; | |
1527 | } | |
1528 | ||
1529 | /* | |
1530 | * strore the expected generation for seed devices in device items. | |
1531 | */ | |
1532 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
1533 | struct btrfs_root *root) | |
1534 | { | |
1535 | struct btrfs_path *path; | |
1536 | struct extent_buffer *leaf; | |
1537 | struct btrfs_dev_item *dev_item; | |
1538 | struct btrfs_device *device; | |
1539 | struct btrfs_key key; | |
1540 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
1541 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
1542 | u64 devid; | |
1543 | int ret; | |
1544 | ||
1545 | path = btrfs_alloc_path(); | |
1546 | if (!path) | |
1547 | return -ENOMEM; | |
1548 | ||
1549 | root = root->fs_info->chunk_root; | |
1550 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1551 | key.offset = 0; | |
1552 | key.type = BTRFS_DEV_ITEM_KEY; | |
1553 | ||
1554 | while (1) { | |
1555 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1556 | if (ret < 0) | |
1557 | goto error; | |
1558 | ||
1559 | leaf = path->nodes[0]; | |
1560 | next_slot: | |
1561 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1562 | ret = btrfs_next_leaf(root, path); | |
1563 | if (ret > 0) | |
1564 | break; | |
1565 | if (ret < 0) | |
1566 | goto error; | |
1567 | leaf = path->nodes[0]; | |
1568 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 1569 | btrfs_release_path(path); |
2b82032c YZ |
1570 | continue; |
1571 | } | |
1572 | ||
1573 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1574 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
1575 | key.type != BTRFS_DEV_ITEM_KEY) | |
1576 | break; | |
1577 | ||
1578 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
1579 | struct btrfs_dev_item); | |
1580 | devid = btrfs_device_id(leaf, dev_item); | |
1581 | read_extent_buffer(leaf, dev_uuid, | |
1582 | (unsigned long)btrfs_device_uuid(dev_item), | |
1583 | BTRFS_UUID_SIZE); | |
1584 | read_extent_buffer(leaf, fs_uuid, | |
1585 | (unsigned long)btrfs_device_fsid(dev_item), | |
1586 | BTRFS_UUID_SIZE); | |
1587 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
1588 | BUG_ON(!device); | |
1589 | ||
1590 | if (device->fs_devices->seeding) { | |
1591 | btrfs_set_device_generation(leaf, dev_item, | |
1592 | device->generation); | |
1593 | btrfs_mark_buffer_dirty(leaf); | |
1594 | } | |
1595 | ||
1596 | path->slots[0]++; | |
1597 | goto next_slot; | |
1598 | } | |
1599 | ret = 0; | |
1600 | error: | |
1601 | btrfs_free_path(path); | |
1602 | return ret; | |
1603 | } | |
1604 | ||
788f20eb CM |
1605 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
1606 | { | |
d5e2003c | 1607 | struct request_queue *q; |
788f20eb CM |
1608 | struct btrfs_trans_handle *trans; |
1609 | struct btrfs_device *device; | |
1610 | struct block_device *bdev; | |
788f20eb | 1611 | struct list_head *devices; |
2b82032c | 1612 | struct super_block *sb = root->fs_info->sb; |
788f20eb | 1613 | u64 total_bytes; |
2b82032c | 1614 | int seeding_dev = 0; |
788f20eb CM |
1615 | int ret = 0; |
1616 | ||
2b82032c YZ |
1617 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
1618 | return -EINVAL; | |
788f20eb | 1619 | |
a5d16333 | 1620 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, |
d4d77629 | 1621 | root->fs_info->bdev_holder); |
7f59203a JB |
1622 | if (IS_ERR(bdev)) |
1623 | return PTR_ERR(bdev); | |
a2135011 | 1624 | |
2b82032c YZ |
1625 | if (root->fs_info->fs_devices->seeding) { |
1626 | seeding_dev = 1; | |
1627 | down_write(&sb->s_umount); | |
1628 | mutex_lock(&uuid_mutex); | |
1629 | } | |
1630 | ||
8c8bee1d | 1631 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
7d9eb12c | 1632 | mutex_lock(&root->fs_info->volume_mutex); |
a2135011 | 1633 | |
788f20eb | 1634 | devices = &root->fs_info->fs_devices->devices; |
e5e9a520 CM |
1635 | /* |
1636 | * we have the volume lock, so we don't need the extra | |
1637 | * device list mutex while reading the list here. | |
1638 | */ | |
c6e30871 | 1639 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
1640 | if (device->bdev == bdev) { |
1641 | ret = -EEXIST; | |
2b82032c | 1642 | goto error; |
788f20eb CM |
1643 | } |
1644 | } | |
1645 | ||
1646 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
1647 | if (!device) { | |
1648 | /* we can safely leave the fs_devices entry around */ | |
1649 | ret = -ENOMEM; | |
2b82032c | 1650 | goto error; |
788f20eb CM |
1651 | } |
1652 | ||
788f20eb CM |
1653 | device->name = kstrdup(device_path, GFP_NOFS); |
1654 | if (!device->name) { | |
1655 | kfree(device); | |
2b82032c YZ |
1656 | ret = -ENOMEM; |
1657 | goto error; | |
788f20eb | 1658 | } |
2b82032c YZ |
1659 | |
1660 | ret = find_next_devid(root, &device->devid); | |
1661 | if (ret) { | |
67100f25 | 1662 | kfree(device->name); |
2b82032c YZ |
1663 | kfree(device); |
1664 | goto error; | |
1665 | } | |
1666 | ||
a22285a6 | 1667 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 1668 | if (IS_ERR(trans)) { |
67100f25 | 1669 | kfree(device->name); |
98d5dc13 TI |
1670 | kfree(device); |
1671 | ret = PTR_ERR(trans); | |
1672 | goto error; | |
1673 | } | |
1674 | ||
2b82032c YZ |
1675 | lock_chunks(root); |
1676 | ||
d5e2003c JB |
1677 | q = bdev_get_queue(bdev); |
1678 | if (blk_queue_discard(q)) | |
1679 | device->can_discard = 1; | |
2b82032c YZ |
1680 | device->writeable = 1; |
1681 | device->work.func = pending_bios_fn; | |
1682 | generate_random_uuid(device->uuid); | |
1683 | spin_lock_init(&device->io_lock); | |
1684 | device->generation = trans->transid; | |
788f20eb CM |
1685 | device->io_width = root->sectorsize; |
1686 | device->io_align = root->sectorsize; | |
1687 | device->sector_size = root->sectorsize; | |
1688 | device->total_bytes = i_size_read(bdev->bd_inode); | |
2cc3c559 | 1689 | device->disk_total_bytes = device->total_bytes; |
788f20eb CM |
1690 | device->dev_root = root->fs_info->dev_root; |
1691 | device->bdev = bdev; | |
dfe25020 | 1692 | device->in_fs_metadata = 1; |
fb01aa85 | 1693 | device->mode = FMODE_EXCL; |
2b82032c | 1694 | set_blocksize(device->bdev, 4096); |
788f20eb | 1695 | |
2b82032c YZ |
1696 | if (seeding_dev) { |
1697 | sb->s_flags &= ~MS_RDONLY; | |
1698 | ret = btrfs_prepare_sprout(trans, root); | |
1699 | BUG_ON(ret); | |
1700 | } | |
788f20eb | 1701 | |
2b82032c | 1702 | device->fs_devices = root->fs_info->fs_devices; |
e5e9a520 CM |
1703 | |
1704 | /* | |
1705 | * we don't want write_supers to jump in here with our device | |
1706 | * half setup | |
1707 | */ | |
1708 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c | 1709 | list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices); |
2b82032c YZ |
1710 | list_add(&device->dev_alloc_list, |
1711 | &root->fs_info->fs_devices->alloc_list); | |
1712 | root->fs_info->fs_devices->num_devices++; | |
1713 | root->fs_info->fs_devices->open_devices++; | |
1714 | root->fs_info->fs_devices->rw_devices++; | |
d5e2003c JB |
1715 | if (device->can_discard) |
1716 | root->fs_info->fs_devices->num_can_discard++; | |
2b82032c | 1717 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; |
325cd4ba | 1718 | |
2bf64758 JB |
1719 | spin_lock(&root->fs_info->free_chunk_lock); |
1720 | root->fs_info->free_chunk_space += device->total_bytes; | |
1721 | spin_unlock(&root->fs_info->free_chunk_lock); | |
1722 | ||
c289811c CM |
1723 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
1724 | root->fs_info->fs_devices->rotating = 1; | |
1725 | ||
6c41761f DS |
1726 | total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy); |
1727 | btrfs_set_super_total_bytes(root->fs_info->super_copy, | |
788f20eb CM |
1728 | total_bytes + device->total_bytes); |
1729 | ||
6c41761f DS |
1730 | total_bytes = btrfs_super_num_devices(root->fs_info->super_copy); |
1731 | btrfs_set_super_num_devices(root->fs_info->super_copy, | |
788f20eb | 1732 | total_bytes + 1); |
e5e9a520 | 1733 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 1734 | |
2b82032c YZ |
1735 | if (seeding_dev) { |
1736 | ret = init_first_rw_device(trans, root, device); | |
1737 | BUG_ON(ret); | |
1738 | ret = btrfs_finish_sprout(trans, root); | |
1739 | BUG_ON(ret); | |
1740 | } else { | |
1741 | ret = btrfs_add_device(trans, root, device); | |
1742 | } | |
1743 | ||
913d952e CM |
1744 | /* |
1745 | * we've got more storage, clear any full flags on the space | |
1746 | * infos | |
1747 | */ | |
1748 | btrfs_clear_space_info_full(root->fs_info); | |
1749 | ||
7d9eb12c | 1750 | unlock_chunks(root); |
2b82032c | 1751 | btrfs_commit_transaction(trans, root); |
a2135011 | 1752 | |
2b82032c YZ |
1753 | if (seeding_dev) { |
1754 | mutex_unlock(&uuid_mutex); | |
1755 | up_write(&sb->s_umount); | |
788f20eb | 1756 | |
2b82032c YZ |
1757 | ret = btrfs_relocate_sys_chunks(root); |
1758 | BUG_ON(ret); | |
1759 | } | |
1760 | out: | |
1761 | mutex_unlock(&root->fs_info->volume_mutex); | |
1762 | return ret; | |
1763 | error: | |
e525fd89 | 1764 | blkdev_put(bdev, FMODE_EXCL); |
2b82032c YZ |
1765 | if (seeding_dev) { |
1766 | mutex_unlock(&uuid_mutex); | |
1767 | up_write(&sb->s_umount); | |
1768 | } | |
788f20eb CM |
1769 | goto out; |
1770 | } | |
1771 | ||
d397712b CM |
1772 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
1773 | struct btrfs_device *device) | |
0b86a832 CM |
1774 | { |
1775 | int ret; | |
1776 | struct btrfs_path *path; | |
1777 | struct btrfs_root *root; | |
1778 | struct btrfs_dev_item *dev_item; | |
1779 | struct extent_buffer *leaf; | |
1780 | struct btrfs_key key; | |
1781 | ||
1782 | root = device->dev_root->fs_info->chunk_root; | |
1783 | ||
1784 | path = btrfs_alloc_path(); | |
1785 | if (!path) | |
1786 | return -ENOMEM; | |
1787 | ||
1788 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1789 | key.type = BTRFS_DEV_ITEM_KEY; | |
1790 | key.offset = device->devid; | |
1791 | ||
1792 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1793 | if (ret < 0) | |
1794 | goto out; | |
1795 | ||
1796 | if (ret > 0) { | |
1797 | ret = -ENOENT; | |
1798 | goto out; | |
1799 | } | |
1800 | ||
1801 | leaf = path->nodes[0]; | |
1802 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1803 | ||
1804 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
1805 | btrfs_set_device_type(leaf, dev_item, device->type); | |
1806 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1807 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1808 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
d6397bae | 1809 | btrfs_set_device_total_bytes(leaf, dev_item, device->disk_total_bytes); |
0b86a832 CM |
1810 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); |
1811 | btrfs_mark_buffer_dirty(leaf); | |
1812 | ||
1813 | out: | |
1814 | btrfs_free_path(path); | |
1815 | return ret; | |
1816 | } | |
1817 | ||
7d9eb12c | 1818 | static int __btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
1819 | struct btrfs_device *device, u64 new_size) |
1820 | { | |
1821 | struct btrfs_super_block *super_copy = | |
6c41761f | 1822 | device->dev_root->fs_info->super_copy; |
8f18cf13 CM |
1823 | u64 old_total = btrfs_super_total_bytes(super_copy); |
1824 | u64 diff = new_size - device->total_bytes; | |
1825 | ||
2b82032c YZ |
1826 | if (!device->writeable) |
1827 | return -EACCES; | |
1828 | if (new_size <= device->total_bytes) | |
1829 | return -EINVAL; | |
1830 | ||
8f18cf13 | 1831 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
2b82032c YZ |
1832 | device->fs_devices->total_rw_bytes += diff; |
1833 | ||
1834 | device->total_bytes = new_size; | |
9779b72f | 1835 | device->disk_total_bytes = new_size; |
4184ea7f CM |
1836 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
1837 | ||
8f18cf13 CM |
1838 | return btrfs_update_device(trans, device); |
1839 | } | |
1840 | ||
7d9eb12c CM |
1841 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
1842 | struct btrfs_device *device, u64 new_size) | |
1843 | { | |
1844 | int ret; | |
1845 | lock_chunks(device->dev_root); | |
1846 | ret = __btrfs_grow_device(trans, device, new_size); | |
1847 | unlock_chunks(device->dev_root); | |
1848 | return ret; | |
1849 | } | |
1850 | ||
8f18cf13 CM |
1851 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, |
1852 | struct btrfs_root *root, | |
1853 | u64 chunk_tree, u64 chunk_objectid, | |
1854 | u64 chunk_offset) | |
1855 | { | |
1856 | int ret; | |
1857 | struct btrfs_path *path; | |
1858 | struct btrfs_key key; | |
1859 | ||
1860 | root = root->fs_info->chunk_root; | |
1861 | path = btrfs_alloc_path(); | |
1862 | if (!path) | |
1863 | return -ENOMEM; | |
1864 | ||
1865 | key.objectid = chunk_objectid; | |
1866 | key.offset = chunk_offset; | |
1867 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1868 | ||
1869 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1870 | BUG_ON(ret); | |
1871 | ||
1872 | ret = btrfs_del_item(trans, root, path); | |
8f18cf13 CM |
1873 | |
1874 | btrfs_free_path(path); | |
65a246c5 | 1875 | return ret; |
8f18cf13 CM |
1876 | } |
1877 | ||
b2950863 | 1878 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
8f18cf13 CM |
1879 | chunk_offset) |
1880 | { | |
6c41761f | 1881 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 CM |
1882 | struct btrfs_disk_key *disk_key; |
1883 | struct btrfs_chunk *chunk; | |
1884 | u8 *ptr; | |
1885 | int ret = 0; | |
1886 | u32 num_stripes; | |
1887 | u32 array_size; | |
1888 | u32 len = 0; | |
1889 | u32 cur; | |
1890 | struct btrfs_key key; | |
1891 | ||
1892 | array_size = btrfs_super_sys_array_size(super_copy); | |
1893 | ||
1894 | ptr = super_copy->sys_chunk_array; | |
1895 | cur = 0; | |
1896 | ||
1897 | while (cur < array_size) { | |
1898 | disk_key = (struct btrfs_disk_key *)ptr; | |
1899 | btrfs_disk_key_to_cpu(&key, disk_key); | |
1900 | ||
1901 | len = sizeof(*disk_key); | |
1902 | ||
1903 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
1904 | chunk = (struct btrfs_chunk *)(ptr + len); | |
1905 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
1906 | len += btrfs_chunk_item_size(num_stripes); | |
1907 | } else { | |
1908 | ret = -EIO; | |
1909 | break; | |
1910 | } | |
1911 | if (key.objectid == chunk_objectid && | |
1912 | key.offset == chunk_offset) { | |
1913 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
1914 | array_size -= len; | |
1915 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
1916 | } else { | |
1917 | ptr += len; | |
1918 | cur += len; | |
1919 | } | |
1920 | } | |
1921 | return ret; | |
1922 | } | |
1923 | ||
b2950863 | 1924 | static int btrfs_relocate_chunk(struct btrfs_root *root, |
8f18cf13 CM |
1925 | u64 chunk_tree, u64 chunk_objectid, |
1926 | u64 chunk_offset) | |
1927 | { | |
1928 | struct extent_map_tree *em_tree; | |
1929 | struct btrfs_root *extent_root; | |
1930 | struct btrfs_trans_handle *trans; | |
1931 | struct extent_map *em; | |
1932 | struct map_lookup *map; | |
1933 | int ret; | |
1934 | int i; | |
1935 | ||
1936 | root = root->fs_info->chunk_root; | |
1937 | extent_root = root->fs_info->extent_root; | |
1938 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
1939 | ||
ba1bf481 JB |
1940 | ret = btrfs_can_relocate(extent_root, chunk_offset); |
1941 | if (ret) | |
1942 | return -ENOSPC; | |
1943 | ||
8f18cf13 | 1944 | /* step one, relocate all the extents inside this chunk */ |
1a40e23b | 1945 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); |
a22285a6 YZ |
1946 | if (ret) |
1947 | return ret; | |
8f18cf13 | 1948 | |
a22285a6 | 1949 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 1950 | BUG_ON(IS_ERR(trans)); |
8f18cf13 | 1951 | |
7d9eb12c CM |
1952 | lock_chunks(root); |
1953 | ||
8f18cf13 CM |
1954 | /* |
1955 | * step two, delete the device extents and the | |
1956 | * chunk tree entries | |
1957 | */ | |
890871be | 1958 | read_lock(&em_tree->lock); |
8f18cf13 | 1959 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); |
890871be | 1960 | read_unlock(&em_tree->lock); |
8f18cf13 | 1961 | |
a061fc8d CM |
1962 | BUG_ON(em->start > chunk_offset || |
1963 | em->start + em->len < chunk_offset); | |
8f18cf13 CM |
1964 | map = (struct map_lookup *)em->bdev; |
1965 | ||
1966 | for (i = 0; i < map->num_stripes; i++) { | |
1967 | ret = btrfs_free_dev_extent(trans, map->stripes[i].dev, | |
1968 | map->stripes[i].physical); | |
1969 | BUG_ON(ret); | |
a061fc8d | 1970 | |
dfe25020 CM |
1971 | if (map->stripes[i].dev) { |
1972 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
1973 | BUG_ON(ret); | |
1974 | } | |
8f18cf13 CM |
1975 | } |
1976 | ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid, | |
1977 | chunk_offset); | |
1978 | ||
1979 | BUG_ON(ret); | |
1980 | ||
1abe9b8a | 1981 | trace_btrfs_chunk_free(root, map, chunk_offset, em->len); |
1982 | ||
8f18cf13 CM |
1983 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
1984 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
1985 | BUG_ON(ret); | |
8f18cf13 CM |
1986 | } |
1987 | ||
2b82032c YZ |
1988 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset); |
1989 | BUG_ON(ret); | |
1990 | ||
890871be | 1991 | write_lock(&em_tree->lock); |
2b82032c | 1992 | remove_extent_mapping(em_tree, em); |
890871be | 1993 | write_unlock(&em_tree->lock); |
2b82032c YZ |
1994 | |
1995 | kfree(map); | |
1996 | em->bdev = NULL; | |
1997 | ||
1998 | /* once for the tree */ | |
1999 | free_extent_map(em); | |
2000 | /* once for us */ | |
2001 | free_extent_map(em); | |
2002 | ||
2003 | unlock_chunks(root); | |
2004 | btrfs_end_transaction(trans, root); | |
2005 | return 0; | |
2006 | } | |
2007 | ||
2008 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) | |
2009 | { | |
2010 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; | |
2011 | struct btrfs_path *path; | |
2012 | struct extent_buffer *leaf; | |
2013 | struct btrfs_chunk *chunk; | |
2014 | struct btrfs_key key; | |
2015 | struct btrfs_key found_key; | |
2016 | u64 chunk_tree = chunk_root->root_key.objectid; | |
2017 | u64 chunk_type; | |
ba1bf481 JB |
2018 | bool retried = false; |
2019 | int failed = 0; | |
2b82032c YZ |
2020 | int ret; |
2021 | ||
2022 | path = btrfs_alloc_path(); | |
2023 | if (!path) | |
2024 | return -ENOMEM; | |
2025 | ||
ba1bf481 | 2026 | again: |
2b82032c YZ |
2027 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2028 | key.offset = (u64)-1; | |
2029 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2030 | ||
2031 | while (1) { | |
2032 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); | |
2033 | if (ret < 0) | |
2034 | goto error; | |
2035 | BUG_ON(ret == 0); | |
2036 | ||
2037 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
2038 | key.type); | |
2039 | if (ret < 0) | |
2040 | goto error; | |
2041 | if (ret > 0) | |
2042 | break; | |
1a40e23b | 2043 | |
2b82032c YZ |
2044 | leaf = path->nodes[0]; |
2045 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 2046 | |
2b82032c YZ |
2047 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
2048 | struct btrfs_chunk); | |
2049 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
b3b4aa74 | 2050 | btrfs_release_path(path); |
8f18cf13 | 2051 | |
2b82032c YZ |
2052 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2053 | ret = btrfs_relocate_chunk(chunk_root, chunk_tree, | |
2054 | found_key.objectid, | |
2055 | found_key.offset); | |
ba1bf481 JB |
2056 | if (ret == -ENOSPC) |
2057 | failed++; | |
2058 | else if (ret) | |
2059 | BUG(); | |
2b82032c | 2060 | } |
8f18cf13 | 2061 | |
2b82032c YZ |
2062 | if (found_key.offset == 0) |
2063 | break; | |
2064 | key.offset = found_key.offset - 1; | |
2065 | } | |
2066 | ret = 0; | |
ba1bf481 JB |
2067 | if (failed && !retried) { |
2068 | failed = 0; | |
2069 | retried = true; | |
2070 | goto again; | |
2071 | } else if (failed && retried) { | |
2072 | WARN_ON(1); | |
2073 | ret = -ENOSPC; | |
2074 | } | |
2b82032c YZ |
2075 | error: |
2076 | btrfs_free_path(path); | |
2077 | return ret; | |
8f18cf13 CM |
2078 | } |
2079 | ||
ec44a35c CM |
2080 | static u64 div_factor(u64 num, int factor) |
2081 | { | |
2082 | if (factor == 10) | |
2083 | return num; | |
2084 | num *= factor; | |
2085 | do_div(num, 10); | |
2086 | return num; | |
2087 | } | |
2088 | ||
ec44a35c CM |
2089 | int btrfs_balance(struct btrfs_root *dev_root) |
2090 | { | |
2091 | int ret; | |
ec44a35c CM |
2092 | struct list_head *devices = &dev_root->fs_info->fs_devices->devices; |
2093 | struct btrfs_device *device; | |
2094 | u64 old_size; | |
2095 | u64 size_to_free; | |
2096 | struct btrfs_path *path; | |
2097 | struct btrfs_key key; | |
ec44a35c CM |
2098 | struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root; |
2099 | struct btrfs_trans_handle *trans; | |
2100 | struct btrfs_key found_key; | |
2101 | ||
2b82032c YZ |
2102 | if (dev_root->fs_info->sb->s_flags & MS_RDONLY) |
2103 | return -EROFS; | |
ec44a35c | 2104 | |
6f88a440 BH |
2105 | if (!capable(CAP_SYS_ADMIN)) |
2106 | return -EPERM; | |
2107 | ||
7d9eb12c | 2108 | mutex_lock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
2109 | dev_root = dev_root->fs_info->dev_root; |
2110 | ||
ec44a35c | 2111 | /* step one make some room on all the devices */ |
c6e30871 | 2112 | list_for_each_entry(device, devices, dev_list) { |
ec44a35c CM |
2113 | old_size = device->total_bytes; |
2114 | size_to_free = div_factor(old_size, 1); | |
2115 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
2b82032c YZ |
2116 | if (!device->writeable || |
2117 | device->total_bytes - device->bytes_used > size_to_free) | |
ec44a35c CM |
2118 | continue; |
2119 | ||
2120 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
ba1bf481 JB |
2121 | if (ret == -ENOSPC) |
2122 | break; | |
ec44a35c CM |
2123 | BUG_ON(ret); |
2124 | ||
a22285a6 | 2125 | trans = btrfs_start_transaction(dev_root, 0); |
98d5dc13 | 2126 | BUG_ON(IS_ERR(trans)); |
ec44a35c CM |
2127 | |
2128 | ret = btrfs_grow_device(trans, device, old_size); | |
2129 | BUG_ON(ret); | |
2130 | ||
2131 | btrfs_end_transaction(trans, dev_root); | |
2132 | } | |
2133 | ||
2134 | /* step two, relocate all the chunks */ | |
2135 | path = btrfs_alloc_path(); | |
17e9f796 MF |
2136 | if (!path) { |
2137 | ret = -ENOMEM; | |
2138 | goto error; | |
2139 | } | |
ec44a35c CM |
2140 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2141 | key.offset = (u64)-1; | |
2142 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2143 | ||
d397712b | 2144 | while (1) { |
ec44a35c CM |
2145 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
2146 | if (ret < 0) | |
2147 | goto error; | |
2148 | ||
2149 | /* | |
2150 | * this shouldn't happen, it means the last relocate | |
2151 | * failed | |
2152 | */ | |
2153 | if (ret == 0) | |
2154 | break; | |
2155 | ||
2156 | ret = btrfs_previous_item(chunk_root, path, 0, | |
2157 | BTRFS_CHUNK_ITEM_KEY); | |
7d9eb12c | 2158 | if (ret) |
ec44a35c | 2159 | break; |
7d9eb12c | 2160 | |
ec44a35c CM |
2161 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
2162 | path->slots[0]); | |
2163 | if (found_key.objectid != key.objectid) | |
2164 | break; | |
7d9eb12c | 2165 | |
ec44a35c | 2166 | /* chunk zero is special */ |
ba1bf481 | 2167 | if (found_key.offset == 0) |
ec44a35c CM |
2168 | break; |
2169 | ||
b3b4aa74 | 2170 | btrfs_release_path(path); |
ec44a35c CM |
2171 | ret = btrfs_relocate_chunk(chunk_root, |
2172 | chunk_root->root_key.objectid, | |
2173 | found_key.objectid, | |
2174 | found_key.offset); | |
508794eb JB |
2175 | if (ret && ret != -ENOSPC) |
2176 | goto error; | |
ba1bf481 | 2177 | key.offset = found_key.offset - 1; |
ec44a35c CM |
2178 | } |
2179 | ret = 0; | |
2180 | error: | |
2181 | btrfs_free_path(path); | |
7d9eb12c | 2182 | mutex_unlock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
2183 | return ret; |
2184 | } | |
2185 | ||
8f18cf13 CM |
2186 | /* |
2187 | * shrinking a device means finding all of the device extents past | |
2188 | * the new size, and then following the back refs to the chunks. | |
2189 | * The chunk relocation code actually frees the device extent | |
2190 | */ | |
2191 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
2192 | { | |
2193 | struct btrfs_trans_handle *trans; | |
2194 | struct btrfs_root *root = device->dev_root; | |
2195 | struct btrfs_dev_extent *dev_extent = NULL; | |
2196 | struct btrfs_path *path; | |
2197 | u64 length; | |
2198 | u64 chunk_tree; | |
2199 | u64 chunk_objectid; | |
2200 | u64 chunk_offset; | |
2201 | int ret; | |
2202 | int slot; | |
ba1bf481 JB |
2203 | int failed = 0; |
2204 | bool retried = false; | |
8f18cf13 CM |
2205 | struct extent_buffer *l; |
2206 | struct btrfs_key key; | |
6c41761f | 2207 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 | 2208 | u64 old_total = btrfs_super_total_bytes(super_copy); |
ba1bf481 | 2209 | u64 old_size = device->total_bytes; |
8f18cf13 CM |
2210 | u64 diff = device->total_bytes - new_size; |
2211 | ||
2b82032c YZ |
2212 | if (new_size >= device->total_bytes) |
2213 | return -EINVAL; | |
8f18cf13 CM |
2214 | |
2215 | path = btrfs_alloc_path(); | |
2216 | if (!path) | |
2217 | return -ENOMEM; | |
2218 | ||
8f18cf13 CM |
2219 | path->reada = 2; |
2220 | ||
7d9eb12c CM |
2221 | lock_chunks(root); |
2222 | ||
8f18cf13 | 2223 | device->total_bytes = new_size; |
2bf64758 | 2224 | if (device->writeable) { |
2b82032c | 2225 | device->fs_devices->total_rw_bytes -= diff; |
2bf64758 JB |
2226 | spin_lock(&root->fs_info->free_chunk_lock); |
2227 | root->fs_info->free_chunk_space -= diff; | |
2228 | spin_unlock(&root->fs_info->free_chunk_lock); | |
2229 | } | |
7d9eb12c | 2230 | unlock_chunks(root); |
8f18cf13 | 2231 | |
ba1bf481 | 2232 | again: |
8f18cf13 CM |
2233 | key.objectid = device->devid; |
2234 | key.offset = (u64)-1; | |
2235 | key.type = BTRFS_DEV_EXTENT_KEY; | |
2236 | ||
2237 | while (1) { | |
2238 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2239 | if (ret < 0) | |
2240 | goto done; | |
2241 | ||
2242 | ret = btrfs_previous_item(root, path, 0, key.type); | |
2243 | if (ret < 0) | |
2244 | goto done; | |
2245 | if (ret) { | |
2246 | ret = 0; | |
b3b4aa74 | 2247 | btrfs_release_path(path); |
bf1fb512 | 2248 | break; |
8f18cf13 CM |
2249 | } |
2250 | ||
2251 | l = path->nodes[0]; | |
2252 | slot = path->slots[0]; | |
2253 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
2254 | ||
ba1bf481 | 2255 | if (key.objectid != device->devid) { |
b3b4aa74 | 2256 | btrfs_release_path(path); |
bf1fb512 | 2257 | break; |
ba1bf481 | 2258 | } |
8f18cf13 CM |
2259 | |
2260 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
2261 | length = btrfs_dev_extent_length(l, dev_extent); | |
2262 | ||
ba1bf481 | 2263 | if (key.offset + length <= new_size) { |
b3b4aa74 | 2264 | btrfs_release_path(path); |
d6397bae | 2265 | break; |
ba1bf481 | 2266 | } |
8f18cf13 CM |
2267 | |
2268 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
2269 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
2270 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
b3b4aa74 | 2271 | btrfs_release_path(path); |
8f18cf13 CM |
2272 | |
2273 | ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid, | |
2274 | chunk_offset); | |
ba1bf481 | 2275 | if (ret && ret != -ENOSPC) |
8f18cf13 | 2276 | goto done; |
ba1bf481 JB |
2277 | if (ret == -ENOSPC) |
2278 | failed++; | |
2279 | key.offset -= 1; | |
2280 | } | |
2281 | ||
2282 | if (failed && !retried) { | |
2283 | failed = 0; | |
2284 | retried = true; | |
2285 | goto again; | |
2286 | } else if (failed && retried) { | |
2287 | ret = -ENOSPC; | |
2288 | lock_chunks(root); | |
2289 | ||
2290 | device->total_bytes = old_size; | |
2291 | if (device->writeable) | |
2292 | device->fs_devices->total_rw_bytes += diff; | |
2bf64758 JB |
2293 | spin_lock(&root->fs_info->free_chunk_lock); |
2294 | root->fs_info->free_chunk_space += diff; | |
2295 | spin_unlock(&root->fs_info->free_chunk_lock); | |
ba1bf481 JB |
2296 | unlock_chunks(root); |
2297 | goto done; | |
8f18cf13 CM |
2298 | } |
2299 | ||
d6397bae | 2300 | /* Shrinking succeeded, else we would be at "done". */ |
a22285a6 | 2301 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
2302 | if (IS_ERR(trans)) { |
2303 | ret = PTR_ERR(trans); | |
2304 | goto done; | |
2305 | } | |
2306 | ||
d6397bae CB |
2307 | lock_chunks(root); |
2308 | ||
2309 | device->disk_total_bytes = new_size; | |
2310 | /* Now btrfs_update_device() will change the on-disk size. */ | |
2311 | ret = btrfs_update_device(trans, device); | |
2312 | if (ret) { | |
2313 | unlock_chunks(root); | |
2314 | btrfs_end_transaction(trans, root); | |
2315 | goto done; | |
2316 | } | |
2317 | WARN_ON(diff > old_total); | |
2318 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
2319 | unlock_chunks(root); | |
2320 | btrfs_end_transaction(trans, root); | |
8f18cf13 CM |
2321 | done: |
2322 | btrfs_free_path(path); | |
2323 | return ret; | |
2324 | } | |
2325 | ||
b2950863 | 2326 | static int btrfs_add_system_chunk(struct btrfs_trans_handle *trans, |
0b86a832 CM |
2327 | struct btrfs_root *root, |
2328 | struct btrfs_key *key, | |
2329 | struct btrfs_chunk *chunk, int item_size) | |
2330 | { | |
6c41761f | 2331 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
0b86a832 CM |
2332 | struct btrfs_disk_key disk_key; |
2333 | u32 array_size; | |
2334 | u8 *ptr; | |
2335 | ||
2336 | array_size = btrfs_super_sys_array_size(super_copy); | |
2337 | if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) | |
2338 | return -EFBIG; | |
2339 | ||
2340 | ptr = super_copy->sys_chunk_array + array_size; | |
2341 | btrfs_cpu_key_to_disk(&disk_key, key); | |
2342 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
2343 | ptr += sizeof(disk_key); | |
2344 | memcpy(ptr, chunk, item_size); | |
2345 | item_size += sizeof(disk_key); | |
2346 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
2347 | return 0; | |
2348 | } | |
2349 | ||
73c5de00 AJ |
2350 | /* |
2351 | * sort the devices in descending order by max_avail, total_avail | |
2352 | */ | |
2353 | static int btrfs_cmp_device_info(const void *a, const void *b) | |
9b3f68b9 | 2354 | { |
73c5de00 AJ |
2355 | const struct btrfs_device_info *di_a = a; |
2356 | const struct btrfs_device_info *di_b = b; | |
9b3f68b9 | 2357 | |
73c5de00 | 2358 | if (di_a->max_avail > di_b->max_avail) |
b2117a39 | 2359 | return -1; |
73c5de00 | 2360 | if (di_a->max_avail < di_b->max_avail) |
b2117a39 | 2361 | return 1; |
73c5de00 AJ |
2362 | if (di_a->total_avail > di_b->total_avail) |
2363 | return -1; | |
2364 | if (di_a->total_avail < di_b->total_avail) | |
2365 | return 1; | |
2366 | return 0; | |
b2117a39 | 2367 | } |
0b86a832 | 2368 | |
73c5de00 AJ |
2369 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
2370 | struct btrfs_root *extent_root, | |
2371 | struct map_lookup **map_ret, | |
2372 | u64 *num_bytes_out, u64 *stripe_size_out, | |
2373 | u64 start, u64 type) | |
b2117a39 | 2374 | { |
73c5de00 AJ |
2375 | struct btrfs_fs_info *info = extent_root->fs_info; |
2376 | struct btrfs_fs_devices *fs_devices = info->fs_devices; | |
2377 | struct list_head *cur; | |
2378 | struct map_lookup *map = NULL; | |
2379 | struct extent_map_tree *em_tree; | |
2380 | struct extent_map *em; | |
2381 | struct btrfs_device_info *devices_info = NULL; | |
2382 | u64 total_avail; | |
2383 | int num_stripes; /* total number of stripes to allocate */ | |
2384 | int sub_stripes; /* sub_stripes info for map */ | |
2385 | int dev_stripes; /* stripes per dev */ | |
2386 | int devs_max; /* max devs to use */ | |
2387 | int devs_min; /* min devs needed */ | |
2388 | int devs_increment; /* ndevs has to be a multiple of this */ | |
2389 | int ncopies; /* how many copies to data has */ | |
2390 | int ret; | |
2391 | u64 max_stripe_size; | |
2392 | u64 max_chunk_size; | |
2393 | u64 stripe_size; | |
2394 | u64 num_bytes; | |
2395 | int ndevs; | |
2396 | int i; | |
2397 | int j; | |
593060d7 | 2398 | |
73c5de00 AJ |
2399 | if ((type & BTRFS_BLOCK_GROUP_RAID1) && |
2400 | (type & BTRFS_BLOCK_GROUP_DUP)) { | |
2401 | WARN_ON(1); | |
2402 | type &= ~BTRFS_BLOCK_GROUP_DUP; | |
321aecc6 | 2403 | } |
9b3f68b9 | 2404 | |
73c5de00 AJ |
2405 | if (list_empty(&fs_devices->alloc_list)) |
2406 | return -ENOSPC; | |
b2117a39 | 2407 | |
73c5de00 AJ |
2408 | sub_stripes = 1; |
2409 | dev_stripes = 1; | |
2410 | devs_increment = 1; | |
2411 | ncopies = 1; | |
2412 | devs_max = 0; /* 0 == as many as possible */ | |
2413 | devs_min = 1; | |
2414 | ||
2415 | /* | |
2416 | * define the properties of each RAID type. | |
2417 | * FIXME: move this to a global table and use it in all RAID | |
2418 | * calculation code | |
2419 | */ | |
2420 | if (type & (BTRFS_BLOCK_GROUP_DUP)) { | |
2421 | dev_stripes = 2; | |
b2117a39 | 2422 | ncopies = 2; |
73c5de00 AJ |
2423 | devs_max = 1; |
2424 | } else if (type & (BTRFS_BLOCK_GROUP_RAID0)) { | |
2425 | devs_min = 2; | |
2426 | } else if (type & (BTRFS_BLOCK_GROUP_RAID1)) { | |
2427 | devs_increment = 2; | |
b2117a39 | 2428 | ncopies = 2; |
73c5de00 AJ |
2429 | devs_max = 2; |
2430 | devs_min = 2; | |
2431 | } else if (type & (BTRFS_BLOCK_GROUP_RAID10)) { | |
2432 | sub_stripes = 2; | |
2433 | devs_increment = 2; | |
2434 | ncopies = 2; | |
2435 | devs_min = 4; | |
2436 | } else { | |
2437 | devs_max = 1; | |
2438 | } | |
b2117a39 | 2439 | |
9b3f68b9 | 2440 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
73c5de00 AJ |
2441 | max_stripe_size = 1024 * 1024 * 1024; |
2442 | max_chunk_size = 10 * max_stripe_size; | |
9b3f68b9 | 2443 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
73c5de00 AJ |
2444 | max_stripe_size = 256 * 1024 * 1024; |
2445 | max_chunk_size = max_stripe_size; | |
a40a90a0 | 2446 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
73c5de00 AJ |
2447 | max_stripe_size = 8 * 1024 * 1024; |
2448 | max_chunk_size = 2 * max_stripe_size; | |
2449 | } else { | |
2450 | printk(KERN_ERR "btrfs: invalid chunk type 0x%llx requested\n", | |
2451 | type); | |
2452 | BUG_ON(1); | |
9b3f68b9 CM |
2453 | } |
2454 | ||
2b82032c YZ |
2455 | /* we don't want a chunk larger than 10% of writeable space */ |
2456 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
2457 | max_chunk_size); | |
9b3f68b9 | 2458 | |
73c5de00 AJ |
2459 | devices_info = kzalloc(sizeof(*devices_info) * fs_devices->rw_devices, |
2460 | GFP_NOFS); | |
2461 | if (!devices_info) | |
2462 | return -ENOMEM; | |
0cad8a11 | 2463 | |
73c5de00 | 2464 | cur = fs_devices->alloc_list.next; |
9b3f68b9 | 2465 | |
9f680ce0 | 2466 | /* |
73c5de00 AJ |
2467 | * in the first pass through the devices list, we gather information |
2468 | * about the available holes on each device. | |
9f680ce0 | 2469 | */ |
73c5de00 AJ |
2470 | ndevs = 0; |
2471 | while (cur != &fs_devices->alloc_list) { | |
2472 | struct btrfs_device *device; | |
2473 | u64 max_avail; | |
2474 | u64 dev_offset; | |
b2117a39 | 2475 | |
73c5de00 | 2476 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
9f680ce0 | 2477 | |
73c5de00 | 2478 | cur = cur->next; |
b2117a39 | 2479 | |
73c5de00 AJ |
2480 | if (!device->writeable) { |
2481 | printk(KERN_ERR | |
2482 | "btrfs: read-only device in alloc_list\n"); | |
2483 | WARN_ON(1); | |
2484 | continue; | |
2485 | } | |
b2117a39 | 2486 | |
73c5de00 AJ |
2487 | if (!device->in_fs_metadata) |
2488 | continue; | |
b2117a39 | 2489 | |
73c5de00 AJ |
2490 | if (device->total_bytes > device->bytes_used) |
2491 | total_avail = device->total_bytes - device->bytes_used; | |
2492 | else | |
2493 | total_avail = 0; | |
38c01b96 | 2494 | |
2495 | /* If there is no space on this device, skip it. */ | |
2496 | if (total_avail == 0) | |
2497 | continue; | |
b2117a39 | 2498 | |
73c5de00 AJ |
2499 | ret = find_free_dev_extent(trans, device, |
2500 | max_stripe_size * dev_stripes, | |
2501 | &dev_offset, &max_avail); | |
2502 | if (ret && ret != -ENOSPC) | |
2503 | goto error; | |
b2117a39 | 2504 | |
73c5de00 AJ |
2505 | if (ret == 0) |
2506 | max_avail = max_stripe_size * dev_stripes; | |
b2117a39 | 2507 | |
73c5de00 AJ |
2508 | if (max_avail < BTRFS_STRIPE_LEN * dev_stripes) |
2509 | continue; | |
b2117a39 | 2510 | |
73c5de00 AJ |
2511 | devices_info[ndevs].dev_offset = dev_offset; |
2512 | devices_info[ndevs].max_avail = max_avail; | |
2513 | devices_info[ndevs].total_avail = total_avail; | |
2514 | devices_info[ndevs].dev = device; | |
2515 | ++ndevs; | |
2516 | } | |
b2117a39 | 2517 | |
73c5de00 AJ |
2518 | /* |
2519 | * now sort the devices by hole size / available space | |
2520 | */ | |
2521 | sort(devices_info, ndevs, sizeof(struct btrfs_device_info), | |
2522 | btrfs_cmp_device_info, NULL); | |
b2117a39 | 2523 | |
73c5de00 AJ |
2524 | /* round down to number of usable stripes */ |
2525 | ndevs -= ndevs % devs_increment; | |
b2117a39 | 2526 | |
73c5de00 AJ |
2527 | if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) { |
2528 | ret = -ENOSPC; | |
2529 | goto error; | |
b2117a39 | 2530 | } |
9f680ce0 | 2531 | |
73c5de00 AJ |
2532 | if (devs_max && ndevs > devs_max) |
2533 | ndevs = devs_max; | |
2534 | /* | |
2535 | * the primary goal is to maximize the number of stripes, so use as many | |
2536 | * devices as possible, even if the stripes are not maximum sized. | |
2537 | */ | |
2538 | stripe_size = devices_info[ndevs-1].max_avail; | |
2539 | num_stripes = ndevs * dev_stripes; | |
b2117a39 | 2540 | |
73c5de00 AJ |
2541 | if (stripe_size * num_stripes > max_chunk_size * ncopies) { |
2542 | stripe_size = max_chunk_size * ncopies; | |
2543 | do_div(stripe_size, num_stripes); | |
b2117a39 | 2544 | } |
b2117a39 | 2545 | |
73c5de00 AJ |
2546 | do_div(stripe_size, dev_stripes); |
2547 | do_div(stripe_size, BTRFS_STRIPE_LEN); | |
2548 | stripe_size *= BTRFS_STRIPE_LEN; | |
b2117a39 MX |
2549 | |
2550 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
2551 | if (!map) { | |
2552 | ret = -ENOMEM; | |
2553 | goto error; | |
2554 | } | |
2555 | map->num_stripes = num_stripes; | |
9b3f68b9 | 2556 | |
73c5de00 AJ |
2557 | for (i = 0; i < ndevs; ++i) { |
2558 | for (j = 0; j < dev_stripes; ++j) { | |
2559 | int s = i * dev_stripes + j; | |
2560 | map->stripes[s].dev = devices_info[i].dev; | |
2561 | map->stripes[s].physical = devices_info[i].dev_offset + | |
2562 | j * stripe_size; | |
6324fbf3 | 2563 | } |
6324fbf3 | 2564 | } |
2b82032c | 2565 | map->sector_size = extent_root->sectorsize; |
b2117a39 MX |
2566 | map->stripe_len = BTRFS_STRIPE_LEN; |
2567 | map->io_align = BTRFS_STRIPE_LEN; | |
2568 | map->io_width = BTRFS_STRIPE_LEN; | |
2b82032c | 2569 | map->type = type; |
2b82032c | 2570 | map->sub_stripes = sub_stripes; |
0b86a832 | 2571 | |
2b82032c | 2572 | *map_ret = map; |
73c5de00 | 2573 | num_bytes = stripe_size * (num_stripes / ncopies); |
0b86a832 | 2574 | |
73c5de00 AJ |
2575 | *stripe_size_out = stripe_size; |
2576 | *num_bytes_out = num_bytes; | |
0b86a832 | 2577 | |
73c5de00 | 2578 | trace_btrfs_chunk_alloc(info->chunk_root, map, start, num_bytes); |
1abe9b8a | 2579 | |
172ddd60 | 2580 | em = alloc_extent_map(); |
2b82032c | 2581 | if (!em) { |
b2117a39 MX |
2582 | ret = -ENOMEM; |
2583 | goto error; | |
593060d7 | 2584 | } |
2b82032c YZ |
2585 | em->bdev = (struct block_device *)map; |
2586 | em->start = start; | |
73c5de00 | 2587 | em->len = num_bytes; |
2b82032c YZ |
2588 | em->block_start = 0; |
2589 | em->block_len = em->len; | |
593060d7 | 2590 | |
2b82032c | 2591 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
890871be | 2592 | write_lock(&em_tree->lock); |
2b82032c | 2593 | ret = add_extent_mapping(em_tree, em); |
890871be | 2594 | write_unlock(&em_tree->lock); |
2b82032c YZ |
2595 | BUG_ON(ret); |
2596 | free_extent_map(em); | |
0b86a832 | 2597 | |
2b82032c YZ |
2598 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
2599 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
73c5de00 | 2600 | start, num_bytes); |
2b82032c | 2601 | BUG_ON(ret); |
611f0e00 | 2602 | |
73c5de00 AJ |
2603 | for (i = 0; i < map->num_stripes; ++i) { |
2604 | struct btrfs_device *device; | |
2605 | u64 dev_offset; | |
2606 | ||
2607 | device = map->stripes[i].dev; | |
2608 | dev_offset = map->stripes[i].physical; | |
0b86a832 CM |
2609 | |
2610 | ret = btrfs_alloc_dev_extent(trans, device, | |
2b82032c YZ |
2611 | info->chunk_root->root_key.objectid, |
2612 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
73c5de00 | 2613 | start, dev_offset, stripe_size); |
0b86a832 | 2614 | BUG_ON(ret); |
2b82032c YZ |
2615 | } |
2616 | ||
b2117a39 | 2617 | kfree(devices_info); |
2b82032c | 2618 | return 0; |
b2117a39 MX |
2619 | |
2620 | error: | |
2621 | kfree(map); | |
2622 | kfree(devices_info); | |
2623 | return ret; | |
2b82032c YZ |
2624 | } |
2625 | ||
2626 | static int __finish_chunk_alloc(struct btrfs_trans_handle *trans, | |
2627 | struct btrfs_root *extent_root, | |
2628 | struct map_lookup *map, u64 chunk_offset, | |
2629 | u64 chunk_size, u64 stripe_size) | |
2630 | { | |
2631 | u64 dev_offset; | |
2632 | struct btrfs_key key; | |
2633 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2634 | struct btrfs_device *device; | |
2635 | struct btrfs_chunk *chunk; | |
2636 | struct btrfs_stripe *stripe; | |
2637 | size_t item_size = btrfs_chunk_item_size(map->num_stripes); | |
2638 | int index = 0; | |
2639 | int ret; | |
2640 | ||
2641 | chunk = kzalloc(item_size, GFP_NOFS); | |
2642 | if (!chunk) | |
2643 | return -ENOMEM; | |
2644 | ||
2645 | index = 0; | |
2646 | while (index < map->num_stripes) { | |
2647 | device = map->stripes[index].dev; | |
2648 | device->bytes_used += stripe_size; | |
0b86a832 CM |
2649 | ret = btrfs_update_device(trans, device); |
2650 | BUG_ON(ret); | |
2b82032c YZ |
2651 | index++; |
2652 | } | |
2653 | ||
2bf64758 JB |
2654 | spin_lock(&extent_root->fs_info->free_chunk_lock); |
2655 | extent_root->fs_info->free_chunk_space -= (stripe_size * | |
2656 | map->num_stripes); | |
2657 | spin_unlock(&extent_root->fs_info->free_chunk_lock); | |
2658 | ||
2b82032c YZ |
2659 | index = 0; |
2660 | stripe = &chunk->stripe; | |
2661 | while (index < map->num_stripes) { | |
2662 | device = map->stripes[index].dev; | |
2663 | dev_offset = map->stripes[index].physical; | |
0b86a832 | 2664 | |
e17cade2 CM |
2665 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
2666 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
2667 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 2668 | stripe++; |
0b86a832 CM |
2669 | index++; |
2670 | } | |
2671 | ||
2b82032c | 2672 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 2673 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
2674 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
2675 | btrfs_set_stack_chunk_type(chunk, map->type); | |
2676 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
2677 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
2678 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b86a832 | 2679 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
2b82032c | 2680 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 2681 | |
2b82032c YZ |
2682 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2683 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2684 | key.offset = chunk_offset; | |
0b86a832 | 2685 | |
2b82032c YZ |
2686 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
2687 | BUG_ON(ret); | |
0b86a832 | 2688 | |
2b82032c YZ |
2689 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2690 | ret = btrfs_add_system_chunk(trans, chunk_root, &key, chunk, | |
2691 | item_size); | |
8f18cf13 CM |
2692 | BUG_ON(ret); |
2693 | } | |
1abe9b8a | 2694 | |
0b86a832 | 2695 | kfree(chunk); |
2b82032c YZ |
2696 | return 0; |
2697 | } | |
0b86a832 | 2698 | |
2b82032c YZ |
2699 | /* |
2700 | * Chunk allocation falls into two parts. The first part does works | |
2701 | * that make the new allocated chunk useable, but not do any operation | |
2702 | * that modifies the chunk tree. The second part does the works that | |
2703 | * require modifying the chunk tree. This division is important for the | |
2704 | * bootstrap process of adding storage to a seed btrfs. | |
2705 | */ | |
2706 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2707 | struct btrfs_root *extent_root, u64 type) | |
2708 | { | |
2709 | u64 chunk_offset; | |
2710 | u64 chunk_size; | |
2711 | u64 stripe_size; | |
2712 | struct map_lookup *map; | |
2713 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2714 | int ret; | |
2715 | ||
2716 | ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
2717 | &chunk_offset); | |
2718 | if (ret) | |
2719 | return ret; | |
2720 | ||
2721 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2722 | &stripe_size, chunk_offset, type); | |
2723 | if (ret) | |
2724 | return ret; | |
2725 | ||
2726 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2727 | chunk_size, stripe_size); | |
2728 | BUG_ON(ret); | |
2729 | return 0; | |
2730 | } | |
2731 | ||
d397712b | 2732 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
2b82032c YZ |
2733 | struct btrfs_root *root, |
2734 | struct btrfs_device *device) | |
2735 | { | |
2736 | u64 chunk_offset; | |
2737 | u64 sys_chunk_offset; | |
2738 | u64 chunk_size; | |
2739 | u64 sys_chunk_size; | |
2740 | u64 stripe_size; | |
2741 | u64 sys_stripe_size; | |
2742 | u64 alloc_profile; | |
2743 | struct map_lookup *map; | |
2744 | struct map_lookup *sys_map; | |
2745 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2746 | struct btrfs_root *extent_root = fs_info->extent_root; | |
2747 | int ret; | |
2748 | ||
2749 | ret = find_next_chunk(fs_info->chunk_root, | |
2750 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset); | |
92b8e897 MF |
2751 | if (ret) |
2752 | return ret; | |
2b82032c YZ |
2753 | |
2754 | alloc_profile = BTRFS_BLOCK_GROUP_METADATA | | |
2755 | (fs_info->metadata_alloc_profile & | |
2756 | fs_info->avail_metadata_alloc_bits); | |
2757 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2758 | ||
2759 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2760 | &stripe_size, chunk_offset, alloc_profile); | |
2761 | BUG_ON(ret); | |
2762 | ||
2763 | sys_chunk_offset = chunk_offset + chunk_size; | |
2764 | ||
2765 | alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM | | |
2766 | (fs_info->system_alloc_profile & | |
2767 | fs_info->avail_system_alloc_bits); | |
2768 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2769 | ||
2770 | ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map, | |
2771 | &sys_chunk_size, &sys_stripe_size, | |
2772 | sys_chunk_offset, alloc_profile); | |
2773 | BUG_ON(ret); | |
2774 | ||
2775 | ret = btrfs_add_device(trans, fs_info->chunk_root, device); | |
2776 | BUG_ON(ret); | |
2777 | ||
2778 | /* | |
2779 | * Modifying chunk tree needs allocating new blocks from both | |
2780 | * system block group and metadata block group. So we only can | |
2781 | * do operations require modifying the chunk tree after both | |
2782 | * block groups were created. | |
2783 | */ | |
2784 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2785 | chunk_size, stripe_size); | |
2786 | BUG_ON(ret); | |
2787 | ||
2788 | ret = __finish_chunk_alloc(trans, extent_root, sys_map, | |
2789 | sys_chunk_offset, sys_chunk_size, | |
2790 | sys_stripe_size); | |
b248a415 | 2791 | BUG_ON(ret); |
2b82032c YZ |
2792 | return 0; |
2793 | } | |
2794 | ||
2795 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) | |
2796 | { | |
2797 | struct extent_map *em; | |
2798 | struct map_lookup *map; | |
2799 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
2800 | int readonly = 0; | |
2801 | int i; | |
2802 | ||
890871be | 2803 | read_lock(&map_tree->map_tree.lock); |
2b82032c | 2804 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
890871be | 2805 | read_unlock(&map_tree->map_tree.lock); |
2b82032c YZ |
2806 | if (!em) |
2807 | return 1; | |
2808 | ||
f48b9075 JB |
2809 | if (btrfs_test_opt(root, DEGRADED)) { |
2810 | free_extent_map(em); | |
2811 | return 0; | |
2812 | } | |
2813 | ||
2b82032c YZ |
2814 | map = (struct map_lookup *)em->bdev; |
2815 | for (i = 0; i < map->num_stripes; i++) { | |
2816 | if (!map->stripes[i].dev->writeable) { | |
2817 | readonly = 1; | |
2818 | break; | |
2819 | } | |
2820 | } | |
0b86a832 | 2821 | free_extent_map(em); |
2b82032c | 2822 | return readonly; |
0b86a832 CM |
2823 | } |
2824 | ||
2825 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
2826 | { | |
a8067e02 | 2827 | extent_map_tree_init(&tree->map_tree); |
0b86a832 CM |
2828 | } |
2829 | ||
2830 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
2831 | { | |
2832 | struct extent_map *em; | |
2833 | ||
d397712b | 2834 | while (1) { |
890871be | 2835 | write_lock(&tree->map_tree.lock); |
0b86a832 CM |
2836 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
2837 | if (em) | |
2838 | remove_extent_mapping(&tree->map_tree, em); | |
890871be | 2839 | write_unlock(&tree->map_tree.lock); |
0b86a832 CM |
2840 | if (!em) |
2841 | break; | |
2842 | kfree(em->bdev); | |
2843 | /* once for us */ | |
2844 | free_extent_map(em); | |
2845 | /* once for the tree */ | |
2846 | free_extent_map(em); | |
2847 | } | |
2848 | } | |
2849 | ||
f188591e CM |
2850 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len) |
2851 | { | |
2852 | struct extent_map *em; | |
2853 | struct map_lookup *map; | |
2854 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2855 | int ret; | |
2856 | ||
890871be | 2857 | read_lock(&em_tree->lock); |
f188591e | 2858 | em = lookup_extent_mapping(em_tree, logical, len); |
890871be | 2859 | read_unlock(&em_tree->lock); |
f188591e CM |
2860 | BUG_ON(!em); |
2861 | ||
2862 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2863 | map = (struct map_lookup *)em->bdev; | |
2864 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
2865 | ret = map->num_stripes; | |
321aecc6 CM |
2866 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
2867 | ret = map->sub_stripes; | |
f188591e CM |
2868 | else |
2869 | ret = 1; | |
2870 | free_extent_map(em); | |
f188591e CM |
2871 | return ret; |
2872 | } | |
2873 | ||
dfe25020 CM |
2874 | static int find_live_mirror(struct map_lookup *map, int first, int num, |
2875 | int optimal) | |
2876 | { | |
2877 | int i; | |
2878 | if (map->stripes[optimal].dev->bdev) | |
2879 | return optimal; | |
2880 | for (i = first; i < first + num; i++) { | |
2881 | if (map->stripes[i].dev->bdev) | |
2882 | return i; | |
2883 | } | |
2884 | /* we couldn't find one that doesn't fail. Just return something | |
2885 | * and the io error handling code will clean up eventually | |
2886 | */ | |
2887 | return optimal; | |
2888 | } | |
2889 | ||
f2d8d74d CM |
2890 | static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
2891 | u64 logical, u64 *length, | |
a1d3c478 | 2892 | struct btrfs_bio **bbio_ret, |
7eaceacc | 2893 | int mirror_num) |
0b86a832 CM |
2894 | { |
2895 | struct extent_map *em; | |
2896 | struct map_lookup *map; | |
2897 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2898 | u64 offset; | |
593060d7 | 2899 | u64 stripe_offset; |
fce3bb9a | 2900 | u64 stripe_end_offset; |
593060d7 | 2901 | u64 stripe_nr; |
fce3bb9a LD |
2902 | u64 stripe_nr_orig; |
2903 | u64 stripe_nr_end; | |
cea9e445 | 2904 | int stripes_allocated = 8; |
321aecc6 | 2905 | int stripes_required = 1; |
593060d7 | 2906 | int stripe_index; |
cea9e445 | 2907 | int i; |
f2d8d74d | 2908 | int num_stripes; |
a236aed1 | 2909 | int max_errors = 0; |
a1d3c478 | 2910 | struct btrfs_bio *bbio = NULL; |
0b86a832 | 2911 | |
a1d3c478 | 2912 | if (bbio_ret && !(rw & (REQ_WRITE | REQ_DISCARD))) |
cea9e445 | 2913 | stripes_allocated = 1; |
cea9e445 | 2914 | again: |
a1d3c478 JS |
2915 | if (bbio_ret) { |
2916 | bbio = kzalloc(btrfs_bio_size(stripes_allocated), | |
cea9e445 | 2917 | GFP_NOFS); |
a1d3c478 | 2918 | if (!bbio) |
cea9e445 | 2919 | return -ENOMEM; |
a236aed1 | 2920 | |
a1d3c478 | 2921 | atomic_set(&bbio->error, 0); |
cea9e445 | 2922 | } |
0b86a832 | 2923 | |
890871be | 2924 | read_lock(&em_tree->lock); |
0b86a832 | 2925 | em = lookup_extent_mapping(em_tree, logical, *length); |
890871be | 2926 | read_unlock(&em_tree->lock); |
f2d8d74d | 2927 | |
3b951516 | 2928 | if (!em) { |
d397712b CM |
2929 | printk(KERN_CRIT "unable to find logical %llu len %llu\n", |
2930 | (unsigned long long)logical, | |
2931 | (unsigned long long)*length); | |
f2d8d74d | 2932 | BUG(); |
3b951516 | 2933 | } |
0b86a832 CM |
2934 | |
2935 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2936 | map = (struct map_lookup *)em->bdev; | |
2937 | offset = logical - em->start; | |
593060d7 | 2938 | |
f188591e CM |
2939 | if (mirror_num > map->num_stripes) |
2940 | mirror_num = 0; | |
2941 | ||
a1d3c478 | 2942 | /* if our btrfs_bio struct is too small, back off and try again */ |
7b6d91da | 2943 | if (rw & REQ_WRITE) { |
321aecc6 CM |
2944 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | |
2945 | BTRFS_BLOCK_GROUP_DUP)) { | |
2946 | stripes_required = map->num_stripes; | |
a236aed1 | 2947 | max_errors = 1; |
321aecc6 CM |
2948 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2949 | stripes_required = map->sub_stripes; | |
a236aed1 | 2950 | max_errors = 1; |
321aecc6 CM |
2951 | } |
2952 | } | |
fce3bb9a LD |
2953 | if (rw & REQ_DISCARD) { |
2954 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | | |
2955 | BTRFS_BLOCK_GROUP_RAID1 | | |
2956 | BTRFS_BLOCK_GROUP_DUP | | |
2957 | BTRFS_BLOCK_GROUP_RAID10)) { | |
2958 | stripes_required = map->num_stripes; | |
2959 | } | |
2960 | } | |
a1d3c478 | 2961 | if (bbio_ret && (rw & (REQ_WRITE | REQ_DISCARD)) && |
321aecc6 | 2962 | stripes_allocated < stripes_required) { |
cea9e445 | 2963 | stripes_allocated = map->num_stripes; |
cea9e445 | 2964 | free_extent_map(em); |
a1d3c478 | 2965 | kfree(bbio); |
cea9e445 CM |
2966 | goto again; |
2967 | } | |
593060d7 CM |
2968 | stripe_nr = offset; |
2969 | /* | |
2970 | * stripe_nr counts the total number of stripes we have to stride | |
2971 | * to get to this block | |
2972 | */ | |
2973 | do_div(stripe_nr, map->stripe_len); | |
2974 | ||
2975 | stripe_offset = stripe_nr * map->stripe_len; | |
2976 | BUG_ON(offset < stripe_offset); | |
2977 | ||
2978 | /* stripe_offset is the offset of this block in its stripe*/ | |
2979 | stripe_offset = offset - stripe_offset; | |
2980 | ||
fce3bb9a LD |
2981 | if (rw & REQ_DISCARD) |
2982 | *length = min_t(u64, em->len - offset, *length); | |
2983 | else if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | | |
2984 | BTRFS_BLOCK_GROUP_RAID1 | | |
2985 | BTRFS_BLOCK_GROUP_RAID10 | | |
2986 | BTRFS_BLOCK_GROUP_DUP)) { | |
cea9e445 CM |
2987 | /* we limit the length of each bio to what fits in a stripe */ |
2988 | *length = min_t(u64, em->len - offset, | |
fce3bb9a | 2989 | map->stripe_len - stripe_offset); |
cea9e445 CM |
2990 | } else { |
2991 | *length = em->len - offset; | |
2992 | } | |
f2d8d74d | 2993 | |
a1d3c478 | 2994 | if (!bbio_ret) |
cea9e445 CM |
2995 | goto out; |
2996 | ||
f2d8d74d | 2997 | num_stripes = 1; |
cea9e445 | 2998 | stripe_index = 0; |
fce3bb9a LD |
2999 | stripe_nr_orig = stripe_nr; |
3000 | stripe_nr_end = (offset + *length + map->stripe_len - 1) & | |
3001 | (~(map->stripe_len - 1)); | |
3002 | do_div(stripe_nr_end, map->stripe_len); | |
3003 | stripe_end_offset = stripe_nr_end * map->stripe_len - | |
3004 | (offset + *length); | |
3005 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3006 | if (rw & REQ_DISCARD) | |
3007 | num_stripes = min_t(u64, map->num_stripes, | |
3008 | stripe_nr_end - stripe_nr_orig); | |
3009 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
3010 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { | |
212a17ab | 3011 | if (rw & (REQ_WRITE | REQ_DISCARD)) |
f2d8d74d | 3012 | num_stripes = map->num_stripes; |
2fff734f | 3013 | else if (mirror_num) |
f188591e | 3014 | stripe_index = mirror_num - 1; |
dfe25020 CM |
3015 | else { |
3016 | stripe_index = find_live_mirror(map, 0, | |
3017 | map->num_stripes, | |
3018 | current->pid % map->num_stripes); | |
a1d3c478 | 3019 | mirror_num = stripe_index + 1; |
dfe25020 | 3020 | } |
2fff734f | 3021 | |
611f0e00 | 3022 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
a1d3c478 | 3023 | if (rw & (REQ_WRITE | REQ_DISCARD)) { |
f2d8d74d | 3024 | num_stripes = map->num_stripes; |
a1d3c478 | 3025 | } else if (mirror_num) { |
f188591e | 3026 | stripe_index = mirror_num - 1; |
a1d3c478 JS |
3027 | } else { |
3028 | mirror_num = 1; | |
3029 | } | |
2fff734f | 3030 | |
321aecc6 CM |
3031 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3032 | int factor = map->num_stripes / map->sub_stripes; | |
321aecc6 CM |
3033 | |
3034 | stripe_index = do_div(stripe_nr, factor); | |
3035 | stripe_index *= map->sub_stripes; | |
3036 | ||
7eaceacc | 3037 | if (rw & REQ_WRITE) |
f2d8d74d | 3038 | num_stripes = map->sub_stripes; |
fce3bb9a LD |
3039 | else if (rw & REQ_DISCARD) |
3040 | num_stripes = min_t(u64, map->sub_stripes * | |
3041 | (stripe_nr_end - stripe_nr_orig), | |
3042 | map->num_stripes); | |
321aecc6 CM |
3043 | else if (mirror_num) |
3044 | stripe_index += mirror_num - 1; | |
dfe25020 CM |
3045 | else { |
3046 | stripe_index = find_live_mirror(map, stripe_index, | |
3047 | map->sub_stripes, stripe_index + | |
3048 | current->pid % map->sub_stripes); | |
a1d3c478 | 3049 | mirror_num = stripe_index + 1; |
dfe25020 | 3050 | } |
8790d502 CM |
3051 | } else { |
3052 | /* | |
3053 | * after this do_div call, stripe_nr is the number of stripes | |
3054 | * on this device we have to walk to find the data, and | |
3055 | * stripe_index is the number of our device in the stripe array | |
3056 | */ | |
3057 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
a1d3c478 | 3058 | mirror_num = stripe_index + 1; |
8790d502 | 3059 | } |
593060d7 | 3060 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 3061 | |
fce3bb9a LD |
3062 | if (rw & REQ_DISCARD) { |
3063 | for (i = 0; i < num_stripes; i++) { | |
a1d3c478 | 3064 | bbio->stripes[i].physical = |
f2d8d74d CM |
3065 | map->stripes[stripe_index].physical + |
3066 | stripe_offset + stripe_nr * map->stripe_len; | |
a1d3c478 | 3067 | bbio->stripes[i].dev = map->stripes[stripe_index].dev; |
fce3bb9a LD |
3068 | |
3069 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3070 | u64 stripes; | |
d9d04879 | 3071 | u32 last_stripe = 0; |
fce3bb9a LD |
3072 | int j; |
3073 | ||
d9d04879 CM |
3074 | div_u64_rem(stripe_nr_end - 1, |
3075 | map->num_stripes, | |
3076 | &last_stripe); | |
3077 | ||
fce3bb9a | 3078 | for (j = 0; j < map->num_stripes; j++) { |
d9d04879 CM |
3079 | u32 test; |
3080 | ||
3081 | div_u64_rem(stripe_nr_end - 1 - j, | |
3082 | map->num_stripes, &test); | |
3083 | if (test == stripe_index) | |
fce3bb9a LD |
3084 | break; |
3085 | } | |
3086 | stripes = stripe_nr_end - 1 - j; | |
3087 | do_div(stripes, map->num_stripes); | |
a1d3c478 | 3088 | bbio->stripes[i].length = map->stripe_len * |
fce3bb9a LD |
3089 | (stripes - stripe_nr + 1); |
3090 | ||
3091 | if (i == 0) { | |
a1d3c478 | 3092 | bbio->stripes[i].length -= |
fce3bb9a LD |
3093 | stripe_offset; |
3094 | stripe_offset = 0; | |
3095 | } | |
3096 | if (stripe_index == last_stripe) | |
a1d3c478 | 3097 | bbio->stripes[i].length -= |
fce3bb9a LD |
3098 | stripe_end_offset; |
3099 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
3100 | u64 stripes; | |
3101 | int j; | |
3102 | int factor = map->num_stripes / | |
3103 | map->sub_stripes; | |
d9d04879 CM |
3104 | u32 last_stripe = 0; |
3105 | ||
3106 | div_u64_rem(stripe_nr_end - 1, | |
3107 | factor, &last_stripe); | |
fce3bb9a LD |
3108 | last_stripe *= map->sub_stripes; |
3109 | ||
3110 | for (j = 0; j < factor; j++) { | |
d9d04879 CM |
3111 | u32 test; |
3112 | ||
3113 | div_u64_rem(stripe_nr_end - 1 - j, | |
3114 | factor, &test); | |
3115 | ||
3116 | if (test == | |
fce3bb9a LD |
3117 | stripe_index / map->sub_stripes) |
3118 | break; | |
3119 | } | |
3120 | stripes = stripe_nr_end - 1 - j; | |
3121 | do_div(stripes, factor); | |
a1d3c478 | 3122 | bbio->stripes[i].length = map->stripe_len * |
fce3bb9a LD |
3123 | (stripes - stripe_nr + 1); |
3124 | ||
3125 | if (i < map->sub_stripes) { | |
a1d3c478 | 3126 | bbio->stripes[i].length -= |
fce3bb9a LD |
3127 | stripe_offset; |
3128 | if (i == map->sub_stripes - 1) | |
3129 | stripe_offset = 0; | |
3130 | } | |
3131 | if (stripe_index >= last_stripe && | |
3132 | stripe_index <= (last_stripe + | |
3133 | map->sub_stripes - 1)) { | |
a1d3c478 | 3134 | bbio->stripes[i].length -= |
fce3bb9a LD |
3135 | stripe_end_offset; |
3136 | } | |
3137 | } else | |
a1d3c478 | 3138 | bbio->stripes[i].length = *length; |
fce3bb9a LD |
3139 | |
3140 | stripe_index++; | |
3141 | if (stripe_index == map->num_stripes) { | |
3142 | /* This could only happen for RAID0/10 */ | |
3143 | stripe_index = 0; | |
3144 | stripe_nr++; | |
3145 | } | |
3146 | } | |
3147 | } else { | |
3148 | for (i = 0; i < num_stripes; i++) { | |
a1d3c478 | 3149 | bbio->stripes[i].physical = |
212a17ab LT |
3150 | map->stripes[stripe_index].physical + |
3151 | stripe_offset + | |
3152 | stripe_nr * map->stripe_len; | |
a1d3c478 | 3153 | bbio->stripes[i].dev = |
212a17ab | 3154 | map->stripes[stripe_index].dev; |
fce3bb9a | 3155 | stripe_index++; |
f2d8d74d | 3156 | } |
593060d7 | 3157 | } |
a1d3c478 JS |
3158 | if (bbio_ret) { |
3159 | *bbio_ret = bbio; | |
3160 | bbio->num_stripes = num_stripes; | |
3161 | bbio->max_errors = max_errors; | |
3162 | bbio->mirror_num = mirror_num; | |
f2d8d74d | 3163 | } |
cea9e445 | 3164 | out: |
0b86a832 | 3165 | free_extent_map(em); |
0b86a832 CM |
3166 | return 0; |
3167 | } | |
3168 | ||
f2d8d74d CM |
3169 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
3170 | u64 logical, u64 *length, | |
a1d3c478 | 3171 | struct btrfs_bio **bbio_ret, int mirror_num) |
f2d8d74d | 3172 | { |
a1d3c478 | 3173 | return __btrfs_map_block(map_tree, rw, logical, length, bbio_ret, |
7eaceacc | 3174 | mirror_num); |
f2d8d74d CM |
3175 | } |
3176 | ||
a512bbf8 YZ |
3177 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
3178 | u64 chunk_start, u64 physical, u64 devid, | |
3179 | u64 **logical, int *naddrs, int *stripe_len) | |
3180 | { | |
3181 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
3182 | struct extent_map *em; | |
3183 | struct map_lookup *map; | |
3184 | u64 *buf; | |
3185 | u64 bytenr; | |
3186 | u64 length; | |
3187 | u64 stripe_nr; | |
3188 | int i, j, nr = 0; | |
3189 | ||
890871be | 3190 | read_lock(&em_tree->lock); |
a512bbf8 | 3191 | em = lookup_extent_mapping(em_tree, chunk_start, 1); |
890871be | 3192 | read_unlock(&em_tree->lock); |
a512bbf8 YZ |
3193 | |
3194 | BUG_ON(!em || em->start != chunk_start); | |
3195 | map = (struct map_lookup *)em->bdev; | |
3196 | ||
3197 | length = em->len; | |
3198 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) | |
3199 | do_div(length, map->num_stripes / map->sub_stripes); | |
3200 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
3201 | do_div(length, map->num_stripes); | |
3202 | ||
3203 | buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); | |
3204 | BUG_ON(!buf); | |
3205 | ||
3206 | for (i = 0; i < map->num_stripes; i++) { | |
3207 | if (devid && map->stripes[i].dev->devid != devid) | |
3208 | continue; | |
3209 | if (map->stripes[i].physical > physical || | |
3210 | map->stripes[i].physical + length <= physical) | |
3211 | continue; | |
3212 | ||
3213 | stripe_nr = physical - map->stripes[i].physical; | |
3214 | do_div(stripe_nr, map->stripe_len); | |
3215 | ||
3216 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
3217 | stripe_nr = stripe_nr * map->num_stripes + i; | |
3218 | do_div(stripe_nr, map->sub_stripes); | |
3219 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3220 | stripe_nr = stripe_nr * map->num_stripes + i; | |
3221 | } | |
3222 | bytenr = chunk_start + stripe_nr * map->stripe_len; | |
934d375b | 3223 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
3224 | for (j = 0; j < nr; j++) { |
3225 | if (buf[j] == bytenr) | |
3226 | break; | |
3227 | } | |
934d375b CM |
3228 | if (j == nr) { |
3229 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 3230 | buf[nr++] = bytenr; |
934d375b | 3231 | } |
a512bbf8 YZ |
3232 | } |
3233 | ||
a512bbf8 YZ |
3234 | *logical = buf; |
3235 | *naddrs = nr; | |
3236 | *stripe_len = map->stripe_len; | |
3237 | ||
3238 | free_extent_map(em); | |
3239 | return 0; | |
f2d8d74d CM |
3240 | } |
3241 | ||
a1d3c478 | 3242 | static void btrfs_end_bio(struct bio *bio, int err) |
8790d502 | 3243 | { |
a1d3c478 | 3244 | struct btrfs_bio *bbio = bio->bi_private; |
7d2b4daa | 3245 | int is_orig_bio = 0; |
8790d502 | 3246 | |
8790d502 | 3247 | if (err) |
a1d3c478 | 3248 | atomic_inc(&bbio->error); |
8790d502 | 3249 | |
a1d3c478 | 3250 | if (bio == bbio->orig_bio) |
7d2b4daa CM |
3251 | is_orig_bio = 1; |
3252 | ||
a1d3c478 | 3253 | if (atomic_dec_and_test(&bbio->stripes_pending)) { |
7d2b4daa CM |
3254 | if (!is_orig_bio) { |
3255 | bio_put(bio); | |
a1d3c478 | 3256 | bio = bbio->orig_bio; |
7d2b4daa | 3257 | } |
a1d3c478 JS |
3258 | bio->bi_private = bbio->private; |
3259 | bio->bi_end_io = bbio->end_io; | |
2774b2ca JS |
3260 | bio->bi_bdev = (struct block_device *) |
3261 | (unsigned long)bbio->mirror_num; | |
a236aed1 CM |
3262 | /* only send an error to the higher layers if it is |
3263 | * beyond the tolerance of the multi-bio | |
3264 | */ | |
a1d3c478 | 3265 | if (atomic_read(&bbio->error) > bbio->max_errors) { |
a236aed1 | 3266 | err = -EIO; |
5dbc8fca | 3267 | } else { |
1259ab75 CM |
3268 | /* |
3269 | * this bio is actually up to date, we didn't | |
3270 | * go over the max number of errors | |
3271 | */ | |
3272 | set_bit(BIO_UPTODATE, &bio->bi_flags); | |
a236aed1 | 3273 | err = 0; |
1259ab75 | 3274 | } |
a1d3c478 | 3275 | kfree(bbio); |
8790d502 CM |
3276 | |
3277 | bio_endio(bio, err); | |
7d2b4daa | 3278 | } else if (!is_orig_bio) { |
8790d502 CM |
3279 | bio_put(bio); |
3280 | } | |
8790d502 CM |
3281 | } |
3282 | ||
8b712842 CM |
3283 | struct async_sched { |
3284 | struct bio *bio; | |
3285 | int rw; | |
3286 | struct btrfs_fs_info *info; | |
3287 | struct btrfs_work work; | |
3288 | }; | |
3289 | ||
3290 | /* | |
3291 | * see run_scheduled_bios for a description of why bios are collected for | |
3292 | * async submit. | |
3293 | * | |
3294 | * This will add one bio to the pending list for a device and make sure | |
3295 | * the work struct is scheduled. | |
3296 | */ | |
d397712b | 3297 | static noinline int schedule_bio(struct btrfs_root *root, |
a1b32a59 CM |
3298 | struct btrfs_device *device, |
3299 | int rw, struct bio *bio) | |
8b712842 CM |
3300 | { |
3301 | int should_queue = 1; | |
ffbd517d | 3302 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
3303 | |
3304 | /* don't bother with additional async steps for reads, right now */ | |
7b6d91da | 3305 | if (!(rw & REQ_WRITE)) { |
492bb6de | 3306 | bio_get(bio); |
8b712842 | 3307 | submit_bio(rw, bio); |
492bb6de | 3308 | bio_put(bio); |
8b712842 CM |
3309 | return 0; |
3310 | } | |
3311 | ||
3312 | /* | |
0986fe9e | 3313 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
3314 | * higher layers. Otherwise, the async bio makes it appear we have |
3315 | * made progress against dirty pages when we've really just put it | |
3316 | * on a queue for later | |
3317 | */ | |
0986fe9e | 3318 | atomic_inc(&root->fs_info->nr_async_bios); |
492bb6de | 3319 | WARN_ON(bio->bi_next); |
8b712842 CM |
3320 | bio->bi_next = NULL; |
3321 | bio->bi_rw |= rw; | |
3322 | ||
3323 | spin_lock(&device->io_lock); | |
7b6d91da | 3324 | if (bio->bi_rw & REQ_SYNC) |
ffbd517d CM |
3325 | pending_bios = &device->pending_sync_bios; |
3326 | else | |
3327 | pending_bios = &device->pending_bios; | |
8b712842 | 3328 | |
ffbd517d CM |
3329 | if (pending_bios->tail) |
3330 | pending_bios->tail->bi_next = bio; | |
8b712842 | 3331 | |
ffbd517d CM |
3332 | pending_bios->tail = bio; |
3333 | if (!pending_bios->head) | |
3334 | pending_bios->head = bio; | |
8b712842 CM |
3335 | if (device->running_pending) |
3336 | should_queue = 0; | |
3337 | ||
3338 | spin_unlock(&device->io_lock); | |
3339 | ||
3340 | if (should_queue) | |
1cc127b5 CM |
3341 | btrfs_queue_worker(&root->fs_info->submit_workers, |
3342 | &device->work); | |
8b712842 CM |
3343 | return 0; |
3344 | } | |
3345 | ||
f188591e | 3346 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 3347 | int mirror_num, int async_submit) |
0b86a832 CM |
3348 | { |
3349 | struct btrfs_mapping_tree *map_tree; | |
3350 | struct btrfs_device *dev; | |
8790d502 | 3351 | struct bio *first_bio = bio; |
a62b9401 | 3352 | u64 logical = (u64)bio->bi_sector << 9; |
0b86a832 CM |
3353 | u64 length = 0; |
3354 | u64 map_length; | |
0b86a832 | 3355 | int ret; |
8790d502 CM |
3356 | int dev_nr = 0; |
3357 | int total_devs = 1; | |
a1d3c478 | 3358 | struct btrfs_bio *bbio = NULL; |
0b86a832 | 3359 | |
f2d8d74d | 3360 | length = bio->bi_size; |
0b86a832 CM |
3361 | map_tree = &root->fs_info->mapping_tree; |
3362 | map_length = length; | |
cea9e445 | 3363 | |
a1d3c478 | 3364 | ret = btrfs_map_block(map_tree, rw, logical, &map_length, &bbio, |
f188591e | 3365 | mirror_num); |
cea9e445 CM |
3366 | BUG_ON(ret); |
3367 | ||
a1d3c478 | 3368 | total_devs = bbio->num_stripes; |
cea9e445 | 3369 | if (map_length < length) { |
d397712b CM |
3370 | printk(KERN_CRIT "mapping failed logical %llu bio len %llu " |
3371 | "len %llu\n", (unsigned long long)logical, | |
3372 | (unsigned long long)length, | |
3373 | (unsigned long long)map_length); | |
cea9e445 CM |
3374 | BUG(); |
3375 | } | |
a1d3c478 JS |
3376 | |
3377 | bbio->orig_bio = first_bio; | |
3378 | bbio->private = first_bio->bi_private; | |
3379 | bbio->end_io = first_bio->bi_end_io; | |
3380 | atomic_set(&bbio->stripes_pending, bbio->num_stripes); | |
cea9e445 | 3381 | |
d397712b | 3382 | while (dev_nr < total_devs) { |
a1d3c478 JS |
3383 | if (dev_nr < total_devs - 1) { |
3384 | bio = bio_clone(first_bio, GFP_NOFS); | |
3385 | BUG_ON(!bio); | |
3386 | } else { | |
3387 | bio = first_bio; | |
8790d502 | 3388 | } |
a1d3c478 JS |
3389 | bio->bi_private = bbio; |
3390 | bio->bi_end_io = btrfs_end_bio; | |
3391 | bio->bi_sector = bbio->stripes[dev_nr].physical >> 9; | |
3392 | dev = bbio->stripes[dev_nr].dev; | |
18e503d6 | 3393 | if (dev && dev->bdev && (rw != WRITE || dev->writeable)) { |
a1d3c478 JS |
3394 | pr_debug("btrfs_map_bio: rw %d, secor=%llu, dev=%lu " |
3395 | "(%s id %llu), size=%u\n", rw, | |
3396 | (u64)bio->bi_sector, (u_long)dev->bdev->bd_dev, | |
3397 | dev->name, dev->devid, bio->bi_size); | |
dfe25020 | 3398 | bio->bi_bdev = dev->bdev; |
8b712842 CM |
3399 | if (async_submit) |
3400 | schedule_bio(root, dev, rw, bio); | |
3401 | else | |
3402 | submit_bio(rw, bio); | |
dfe25020 CM |
3403 | } else { |
3404 | bio->bi_bdev = root->fs_info->fs_devices->latest_bdev; | |
3405 | bio->bi_sector = logical >> 9; | |
dfe25020 | 3406 | bio_endio(bio, -EIO); |
dfe25020 | 3407 | } |
8790d502 CM |
3408 | dev_nr++; |
3409 | } | |
0b86a832 CM |
3410 | return 0; |
3411 | } | |
3412 | ||
a443755f | 3413 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, |
2b82032c | 3414 | u8 *uuid, u8 *fsid) |
0b86a832 | 3415 | { |
2b82032c YZ |
3416 | struct btrfs_device *device; |
3417 | struct btrfs_fs_devices *cur_devices; | |
3418 | ||
3419 | cur_devices = root->fs_info->fs_devices; | |
3420 | while (cur_devices) { | |
3421 | if (!fsid || | |
3422 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
3423 | device = __find_device(&cur_devices->devices, | |
3424 | devid, uuid); | |
3425 | if (device) | |
3426 | return device; | |
3427 | } | |
3428 | cur_devices = cur_devices->seed; | |
3429 | } | |
3430 | return NULL; | |
0b86a832 CM |
3431 | } |
3432 | ||
dfe25020 CM |
3433 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
3434 | u64 devid, u8 *dev_uuid) | |
3435 | { | |
3436 | struct btrfs_device *device; | |
3437 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
3438 | ||
3439 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
7cbd8a83 | 3440 | if (!device) |
3441 | return NULL; | |
dfe25020 CM |
3442 | list_add(&device->dev_list, |
3443 | &fs_devices->devices); | |
dfe25020 CM |
3444 | device->dev_root = root->fs_info->dev_root; |
3445 | device->devid = devid; | |
8b712842 | 3446 | device->work.func = pending_bios_fn; |
e4404d6e | 3447 | device->fs_devices = fs_devices; |
cd02dca5 | 3448 | device->missing = 1; |
dfe25020 | 3449 | fs_devices->num_devices++; |
cd02dca5 | 3450 | fs_devices->missing_devices++; |
dfe25020 | 3451 | spin_lock_init(&device->io_lock); |
d20f7043 | 3452 | INIT_LIST_HEAD(&device->dev_alloc_list); |
dfe25020 CM |
3453 | memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE); |
3454 | return device; | |
3455 | } | |
3456 | ||
0b86a832 CM |
3457 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
3458 | struct extent_buffer *leaf, | |
3459 | struct btrfs_chunk *chunk) | |
3460 | { | |
3461 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
3462 | struct map_lookup *map; | |
3463 | struct extent_map *em; | |
3464 | u64 logical; | |
3465 | u64 length; | |
3466 | u64 devid; | |
a443755f | 3467 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 3468 | int num_stripes; |
0b86a832 | 3469 | int ret; |
593060d7 | 3470 | int i; |
0b86a832 | 3471 | |
e17cade2 CM |
3472 | logical = key->offset; |
3473 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 3474 | |
890871be | 3475 | read_lock(&map_tree->map_tree.lock); |
0b86a832 | 3476 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
890871be | 3477 | read_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
3478 | |
3479 | /* already mapped? */ | |
3480 | if (em && em->start <= logical && em->start + em->len > logical) { | |
3481 | free_extent_map(em); | |
0b86a832 CM |
3482 | return 0; |
3483 | } else if (em) { | |
3484 | free_extent_map(em); | |
3485 | } | |
0b86a832 | 3486 | |
172ddd60 | 3487 | em = alloc_extent_map(); |
0b86a832 CM |
3488 | if (!em) |
3489 | return -ENOMEM; | |
593060d7 CM |
3490 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
3491 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
3492 | if (!map) { |
3493 | free_extent_map(em); | |
3494 | return -ENOMEM; | |
3495 | } | |
3496 | ||
3497 | em->bdev = (struct block_device *)map; | |
3498 | em->start = logical; | |
3499 | em->len = length; | |
3500 | em->block_start = 0; | |
c8b97818 | 3501 | em->block_len = em->len; |
0b86a832 | 3502 | |
593060d7 CM |
3503 | map->num_stripes = num_stripes; |
3504 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
3505 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
3506 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
3507 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
3508 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 3509 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
3510 | for (i = 0; i < num_stripes; i++) { |
3511 | map->stripes[i].physical = | |
3512 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
3513 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
3514 | read_extent_buffer(leaf, uuid, (unsigned long) |
3515 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
3516 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
3517 | map->stripes[i].dev = btrfs_find_device(root, devid, uuid, |
3518 | NULL); | |
dfe25020 | 3519 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
593060d7 CM |
3520 | kfree(map); |
3521 | free_extent_map(em); | |
3522 | return -EIO; | |
3523 | } | |
dfe25020 CM |
3524 | if (!map->stripes[i].dev) { |
3525 | map->stripes[i].dev = | |
3526 | add_missing_dev(root, devid, uuid); | |
3527 | if (!map->stripes[i].dev) { | |
3528 | kfree(map); | |
3529 | free_extent_map(em); | |
3530 | return -EIO; | |
3531 | } | |
3532 | } | |
3533 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
3534 | } |
3535 | ||
890871be | 3536 | write_lock(&map_tree->map_tree.lock); |
0b86a832 | 3537 | ret = add_extent_mapping(&map_tree->map_tree, em); |
890871be | 3538 | write_unlock(&map_tree->map_tree.lock); |
b248a415 | 3539 | BUG_ON(ret); |
0b86a832 CM |
3540 | free_extent_map(em); |
3541 | ||
3542 | return 0; | |
3543 | } | |
3544 | ||
3545 | static int fill_device_from_item(struct extent_buffer *leaf, | |
3546 | struct btrfs_dev_item *dev_item, | |
3547 | struct btrfs_device *device) | |
3548 | { | |
3549 | unsigned long ptr; | |
0b86a832 CM |
3550 | |
3551 | device->devid = btrfs_device_id(leaf, dev_item); | |
d6397bae CB |
3552 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
3553 | device->total_bytes = device->disk_total_bytes; | |
0b86a832 CM |
3554 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
3555 | device->type = btrfs_device_type(leaf, dev_item); | |
3556 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
3557 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
3558 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
0b86a832 CM |
3559 | |
3560 | ptr = (unsigned long)btrfs_device_uuid(dev_item); | |
e17cade2 | 3561 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 3562 | |
0b86a832 CM |
3563 | return 0; |
3564 | } | |
3565 | ||
2b82032c YZ |
3566 | static int open_seed_devices(struct btrfs_root *root, u8 *fsid) |
3567 | { | |
3568 | struct btrfs_fs_devices *fs_devices; | |
3569 | int ret; | |
3570 | ||
3571 | mutex_lock(&uuid_mutex); | |
3572 | ||
3573 | fs_devices = root->fs_info->fs_devices->seed; | |
3574 | while (fs_devices) { | |
3575 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
3576 | ret = 0; | |
3577 | goto out; | |
3578 | } | |
3579 | fs_devices = fs_devices->seed; | |
3580 | } | |
3581 | ||
3582 | fs_devices = find_fsid(fsid); | |
3583 | if (!fs_devices) { | |
3584 | ret = -ENOENT; | |
3585 | goto out; | |
3586 | } | |
e4404d6e YZ |
3587 | |
3588 | fs_devices = clone_fs_devices(fs_devices); | |
3589 | if (IS_ERR(fs_devices)) { | |
3590 | ret = PTR_ERR(fs_devices); | |
2b82032c YZ |
3591 | goto out; |
3592 | } | |
3593 | ||
97288f2c | 3594 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
15916de8 | 3595 | root->fs_info->bdev_holder); |
2b82032c YZ |
3596 | if (ret) |
3597 | goto out; | |
3598 | ||
3599 | if (!fs_devices->seeding) { | |
3600 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 3601 | free_fs_devices(fs_devices); |
2b82032c YZ |
3602 | ret = -EINVAL; |
3603 | goto out; | |
3604 | } | |
3605 | ||
3606 | fs_devices->seed = root->fs_info->fs_devices->seed; | |
3607 | root->fs_info->fs_devices->seed = fs_devices; | |
2b82032c YZ |
3608 | out: |
3609 | mutex_unlock(&uuid_mutex); | |
3610 | return ret; | |
3611 | } | |
3612 | ||
0d81ba5d | 3613 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
3614 | struct extent_buffer *leaf, |
3615 | struct btrfs_dev_item *dev_item) | |
3616 | { | |
3617 | struct btrfs_device *device; | |
3618 | u64 devid; | |
3619 | int ret; | |
2b82032c | 3620 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
3621 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
3622 | ||
0b86a832 | 3623 | devid = btrfs_device_id(leaf, dev_item); |
a443755f CM |
3624 | read_extent_buffer(leaf, dev_uuid, |
3625 | (unsigned long)btrfs_device_uuid(dev_item), | |
3626 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
3627 | read_extent_buffer(leaf, fs_uuid, |
3628 | (unsigned long)btrfs_device_fsid(dev_item), | |
3629 | BTRFS_UUID_SIZE); | |
3630 | ||
3631 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { | |
3632 | ret = open_seed_devices(root, fs_uuid); | |
e4404d6e | 3633 | if (ret && !btrfs_test_opt(root, DEGRADED)) |
2b82032c | 3634 | return ret; |
2b82032c YZ |
3635 | } |
3636 | ||
3637 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
3638 | if (!device || !device->bdev) { | |
e4404d6e | 3639 | if (!btrfs_test_opt(root, DEGRADED)) |
2b82032c YZ |
3640 | return -EIO; |
3641 | ||
3642 | if (!device) { | |
d397712b CM |
3643 | printk(KERN_WARNING "warning devid %llu missing\n", |
3644 | (unsigned long long)devid); | |
2b82032c YZ |
3645 | device = add_missing_dev(root, devid, dev_uuid); |
3646 | if (!device) | |
3647 | return -ENOMEM; | |
cd02dca5 CM |
3648 | } else if (!device->missing) { |
3649 | /* | |
3650 | * this happens when a device that was properly setup | |
3651 | * in the device info lists suddenly goes bad. | |
3652 | * device->bdev is NULL, and so we have to set | |
3653 | * device->missing to one here | |
3654 | */ | |
3655 | root->fs_info->fs_devices->missing_devices++; | |
3656 | device->missing = 1; | |
2b82032c YZ |
3657 | } |
3658 | } | |
3659 | ||
3660 | if (device->fs_devices != root->fs_info->fs_devices) { | |
3661 | BUG_ON(device->writeable); | |
3662 | if (device->generation != | |
3663 | btrfs_device_generation(leaf, dev_item)) | |
3664 | return -EINVAL; | |
6324fbf3 | 3665 | } |
0b86a832 CM |
3666 | |
3667 | fill_device_from_item(leaf, dev_item, device); | |
3668 | device->dev_root = root->fs_info->dev_root; | |
dfe25020 | 3669 | device->in_fs_metadata = 1; |
2bf64758 | 3670 | if (device->writeable) { |
2b82032c | 3671 | device->fs_devices->total_rw_bytes += device->total_bytes; |
2bf64758 JB |
3672 | spin_lock(&root->fs_info->free_chunk_lock); |
3673 | root->fs_info->free_chunk_space += device->total_bytes - | |
3674 | device->bytes_used; | |
3675 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3676 | } | |
0b86a832 | 3677 | ret = 0; |
0b86a832 CM |
3678 | return ret; |
3679 | } | |
3680 | ||
e4404d6e | 3681 | int btrfs_read_sys_array(struct btrfs_root *root) |
0b86a832 | 3682 | { |
6c41761f | 3683 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
a061fc8d | 3684 | struct extent_buffer *sb; |
0b86a832 | 3685 | struct btrfs_disk_key *disk_key; |
0b86a832 | 3686 | struct btrfs_chunk *chunk; |
84eed90f CM |
3687 | u8 *ptr; |
3688 | unsigned long sb_ptr; | |
3689 | int ret = 0; | |
0b86a832 CM |
3690 | u32 num_stripes; |
3691 | u32 array_size; | |
3692 | u32 len = 0; | |
0b86a832 | 3693 | u32 cur; |
84eed90f | 3694 | struct btrfs_key key; |
0b86a832 | 3695 | |
e4404d6e | 3696 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET, |
a061fc8d CM |
3697 | BTRFS_SUPER_INFO_SIZE); |
3698 | if (!sb) | |
3699 | return -ENOMEM; | |
3700 | btrfs_set_buffer_uptodate(sb); | |
85d4e461 | 3701 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0); |
4008c04a | 3702 | |
a061fc8d | 3703 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
3704 | array_size = btrfs_super_sys_array_size(super_copy); |
3705 | ||
0b86a832 CM |
3706 | ptr = super_copy->sys_chunk_array; |
3707 | sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array); | |
3708 | cur = 0; | |
3709 | ||
3710 | while (cur < array_size) { | |
3711 | disk_key = (struct btrfs_disk_key *)ptr; | |
3712 | btrfs_disk_key_to_cpu(&key, disk_key); | |
3713 | ||
a061fc8d | 3714 | len = sizeof(*disk_key); ptr += len; |
0b86a832 CM |
3715 | sb_ptr += len; |
3716 | cur += len; | |
3717 | ||
0d81ba5d | 3718 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
0b86a832 | 3719 | chunk = (struct btrfs_chunk *)sb_ptr; |
0d81ba5d | 3720 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
3721 | if (ret) |
3722 | break; | |
0b86a832 CM |
3723 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); |
3724 | len = btrfs_chunk_item_size(num_stripes); | |
3725 | } else { | |
84eed90f CM |
3726 | ret = -EIO; |
3727 | break; | |
0b86a832 CM |
3728 | } |
3729 | ptr += len; | |
3730 | sb_ptr += len; | |
3731 | cur += len; | |
3732 | } | |
a061fc8d | 3733 | free_extent_buffer(sb); |
84eed90f | 3734 | return ret; |
0b86a832 CM |
3735 | } |
3736 | ||
3737 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
3738 | { | |
3739 | struct btrfs_path *path; | |
3740 | struct extent_buffer *leaf; | |
3741 | struct btrfs_key key; | |
3742 | struct btrfs_key found_key; | |
3743 | int ret; | |
3744 | int slot; | |
3745 | ||
3746 | root = root->fs_info->chunk_root; | |
3747 | ||
3748 | path = btrfs_alloc_path(); | |
3749 | if (!path) | |
3750 | return -ENOMEM; | |
3751 | ||
3752 | /* first we search for all of the device items, and then we | |
3753 | * read in all of the chunk items. This way we can create chunk | |
3754 | * mappings that reference all of the devices that are afound | |
3755 | */ | |
3756 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
3757 | key.offset = 0; | |
3758 | key.type = 0; | |
3759 | again: | |
3760 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
ab59381e ZL |
3761 | if (ret < 0) |
3762 | goto error; | |
d397712b | 3763 | while (1) { |
0b86a832 CM |
3764 | leaf = path->nodes[0]; |
3765 | slot = path->slots[0]; | |
3766 | if (slot >= btrfs_header_nritems(leaf)) { | |
3767 | ret = btrfs_next_leaf(root, path); | |
3768 | if (ret == 0) | |
3769 | continue; | |
3770 | if (ret < 0) | |
3771 | goto error; | |
3772 | break; | |
3773 | } | |
3774 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
3775 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3776 | if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID) | |
3777 | break; | |
3778 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { | |
3779 | struct btrfs_dev_item *dev_item; | |
3780 | dev_item = btrfs_item_ptr(leaf, slot, | |
3781 | struct btrfs_dev_item); | |
0d81ba5d | 3782 | ret = read_one_dev(root, leaf, dev_item); |
2b82032c YZ |
3783 | if (ret) |
3784 | goto error; | |
0b86a832 CM |
3785 | } |
3786 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { | |
3787 | struct btrfs_chunk *chunk; | |
3788 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
3789 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2b82032c YZ |
3790 | if (ret) |
3791 | goto error; | |
0b86a832 CM |
3792 | } |
3793 | path->slots[0]++; | |
3794 | } | |
3795 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3796 | key.objectid = 0; | |
b3b4aa74 | 3797 | btrfs_release_path(path); |
0b86a832 CM |
3798 | goto again; |
3799 | } | |
0b86a832 CM |
3800 | ret = 0; |
3801 | error: | |
2b82032c | 3802 | btrfs_free_path(path); |
0b86a832 CM |
3803 | return ret; |
3804 | } |