Commit | Line | Data |
---|---|---|
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> | |
8a4b83cc | 20 | #include <linux/buffer_head.h> |
f2d8d74d | 21 | #include <linux/blkdev.h> |
788f20eb | 22 | #include <linux/random.h> |
593060d7 | 23 | #include <asm/div64.h> |
4b4e25f2 | 24 | #include "compat.h" |
0b86a832 CM |
25 | #include "ctree.h" |
26 | #include "extent_map.h" | |
27 | #include "disk-io.h" | |
28 | #include "transaction.h" | |
29 | #include "print-tree.h" | |
30 | #include "volumes.h" | |
8b712842 | 31 | #include "async-thread.h" |
0b86a832 | 32 | |
593060d7 CM |
33 | struct map_lookup { |
34 | u64 type; | |
35 | int io_align; | |
36 | int io_width; | |
37 | int stripe_len; | |
38 | int sector_size; | |
39 | int num_stripes; | |
321aecc6 | 40 | int sub_stripes; |
cea9e445 | 41 | struct btrfs_bio_stripe stripes[]; |
593060d7 CM |
42 | }; |
43 | ||
2b82032c YZ |
44 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
45 | struct btrfs_root *root, | |
46 | struct btrfs_device *device); | |
47 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); | |
48 | ||
593060d7 | 49 | #define map_lookup_size(n) (sizeof(struct map_lookup) + \ |
cea9e445 | 50 | (sizeof(struct btrfs_bio_stripe) * (n))) |
593060d7 | 51 | |
8a4b83cc CM |
52 | static DEFINE_MUTEX(uuid_mutex); |
53 | static LIST_HEAD(fs_uuids); | |
54 | ||
a061fc8d CM |
55 | void btrfs_lock_volumes(void) |
56 | { | |
57 | mutex_lock(&uuid_mutex); | |
58 | } | |
59 | ||
60 | void btrfs_unlock_volumes(void) | |
61 | { | |
62 | mutex_unlock(&uuid_mutex); | |
63 | } | |
64 | ||
7d9eb12c CM |
65 | static void lock_chunks(struct btrfs_root *root) |
66 | { | |
7d9eb12c CM |
67 | mutex_lock(&root->fs_info->chunk_mutex); |
68 | } | |
69 | ||
70 | static void unlock_chunks(struct btrfs_root *root) | |
71 | { | |
7d9eb12c CM |
72 | mutex_unlock(&root->fs_info->chunk_mutex); |
73 | } | |
74 | ||
e4404d6e YZ |
75 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
76 | { | |
77 | struct btrfs_device *device; | |
78 | WARN_ON(fs_devices->opened); | |
79 | while (!list_empty(&fs_devices->devices)) { | |
80 | device = list_entry(fs_devices->devices.next, | |
81 | struct btrfs_device, dev_list); | |
82 | list_del(&device->dev_list); | |
83 | kfree(device->name); | |
84 | kfree(device); | |
85 | } | |
86 | kfree(fs_devices); | |
87 | } | |
88 | ||
8a4b83cc CM |
89 | int btrfs_cleanup_fs_uuids(void) |
90 | { | |
91 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 92 | |
2b82032c YZ |
93 | while (!list_empty(&fs_uuids)) { |
94 | fs_devices = list_entry(fs_uuids.next, | |
95 | struct btrfs_fs_devices, list); | |
96 | list_del(&fs_devices->list); | |
e4404d6e | 97 | free_fs_devices(fs_devices); |
8a4b83cc CM |
98 | } |
99 | return 0; | |
100 | } | |
101 | ||
a1b32a59 CM |
102 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
103 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
104 | { |
105 | struct btrfs_device *dev; | |
8a4b83cc | 106 | |
c6e30871 | 107 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 108 | if (dev->devid == devid && |
8f18cf13 | 109 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 110 | return dev; |
a443755f | 111 | } |
8a4b83cc CM |
112 | } |
113 | return NULL; | |
114 | } | |
115 | ||
a1b32a59 | 116 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 117 | { |
8a4b83cc CM |
118 | struct btrfs_fs_devices *fs_devices; |
119 | ||
c6e30871 | 120 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
121 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
122 | return fs_devices; | |
123 | } | |
124 | return NULL; | |
125 | } | |
126 | ||
8b712842 CM |
127 | /* |
128 | * we try to collect pending bios for a device so we don't get a large | |
129 | * number of procs sending bios down to the same device. This greatly | |
130 | * improves the schedulers ability to collect and merge the bios. | |
131 | * | |
132 | * But, it also turns into a long list of bios to process and that is sure | |
133 | * to eventually make the worker thread block. The solution here is to | |
134 | * make some progress and then put this work struct back at the end of | |
135 | * the list if the block device is congested. This way, multiple devices | |
136 | * can make progress from a single worker thread. | |
137 | */ | |
d397712b | 138 | static noinline int run_scheduled_bios(struct btrfs_device *device) |
8b712842 CM |
139 | { |
140 | struct bio *pending; | |
141 | struct backing_dev_info *bdi; | |
b64a2851 | 142 | struct btrfs_fs_info *fs_info; |
8b712842 CM |
143 | struct bio *tail; |
144 | struct bio *cur; | |
145 | int again = 0; | |
146 | unsigned long num_run = 0; | |
b64a2851 | 147 | unsigned long limit; |
8b712842 CM |
148 | |
149 | bdi = device->bdev->bd_inode->i_mapping->backing_dev_info; | |
b64a2851 CM |
150 | fs_info = device->dev_root->fs_info; |
151 | limit = btrfs_async_submit_limit(fs_info); | |
152 | limit = limit * 2 / 3; | |
153 | ||
8b712842 CM |
154 | loop: |
155 | spin_lock(&device->io_lock); | |
156 | ||
a6837051 | 157 | loop_lock: |
8b712842 CM |
158 | /* take all the bios off the list at once and process them |
159 | * later on (without the lock held). But, remember the | |
160 | * tail and other pointers so the bios can be properly reinserted | |
161 | * into the list if we hit congestion | |
162 | */ | |
163 | pending = device->pending_bios; | |
164 | tail = device->pending_bio_tail; | |
165 | WARN_ON(pending && !tail); | |
166 | device->pending_bios = NULL; | |
167 | device->pending_bio_tail = NULL; | |
168 | ||
169 | /* | |
170 | * if pending was null this time around, no bios need processing | |
171 | * at all and we can stop. Otherwise it'll loop back up again | |
172 | * and do an additional check so no bios are missed. | |
173 | * | |
174 | * device->running_pending is used to synchronize with the | |
175 | * schedule_bio code. | |
176 | */ | |
177 | if (pending) { | |
178 | again = 1; | |
179 | device->running_pending = 1; | |
180 | } else { | |
181 | again = 0; | |
182 | device->running_pending = 0; | |
183 | } | |
184 | spin_unlock(&device->io_lock); | |
185 | ||
d397712b | 186 | while (pending) { |
8b712842 CM |
187 | cur = pending; |
188 | pending = pending->bi_next; | |
189 | cur->bi_next = NULL; | |
b64a2851 CM |
190 | atomic_dec(&fs_info->nr_async_bios); |
191 | ||
192 | if (atomic_read(&fs_info->nr_async_bios) < limit && | |
193 | waitqueue_active(&fs_info->async_submit_wait)) | |
194 | wake_up(&fs_info->async_submit_wait); | |
492bb6de CM |
195 | |
196 | BUG_ON(atomic_read(&cur->bi_cnt) == 0); | |
197 | bio_get(cur); | |
8b712842 | 198 | submit_bio(cur->bi_rw, cur); |
492bb6de | 199 | bio_put(cur); |
8b712842 CM |
200 | num_run++; |
201 | ||
202 | /* | |
203 | * we made progress, there is more work to do and the bdi | |
204 | * is now congested. Back off and let other work structs | |
205 | * run instead | |
206 | */ | |
a6837051 | 207 | if (pending && bdi_write_congested(bdi) && num_run > 16 && |
5f2cc086 | 208 | fs_info->fs_devices->open_devices > 1) { |
8b712842 CM |
209 | struct bio *old_head; |
210 | ||
211 | spin_lock(&device->io_lock); | |
492bb6de | 212 | |
8b712842 CM |
213 | old_head = device->pending_bios; |
214 | device->pending_bios = pending; | |
215 | if (device->pending_bio_tail) | |
216 | tail->bi_next = old_head; | |
217 | else | |
218 | device->pending_bio_tail = tail; | |
a6837051 CM |
219 | |
220 | device->running_pending = 1; | |
8b712842 CM |
221 | |
222 | spin_unlock(&device->io_lock); | |
223 | btrfs_requeue_work(&device->work); | |
224 | goto done; | |
225 | } | |
226 | } | |
227 | if (again) | |
228 | goto loop; | |
a6837051 CM |
229 | |
230 | spin_lock(&device->io_lock); | |
231 | if (device->pending_bios) | |
232 | goto loop_lock; | |
233 | spin_unlock(&device->io_lock); | |
8b712842 CM |
234 | done: |
235 | return 0; | |
236 | } | |
237 | ||
b2950863 | 238 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
239 | { |
240 | struct btrfs_device *device; | |
241 | ||
242 | device = container_of(work, struct btrfs_device, work); | |
243 | run_scheduled_bios(device); | |
244 | } | |
245 | ||
a1b32a59 | 246 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
247 | struct btrfs_super_block *disk_super, |
248 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
249 | { | |
250 | struct btrfs_device *device; | |
251 | struct btrfs_fs_devices *fs_devices; | |
252 | u64 found_transid = btrfs_super_generation(disk_super); | |
253 | ||
254 | fs_devices = find_fsid(disk_super->fsid); | |
255 | if (!fs_devices) { | |
515dc322 | 256 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
8a4b83cc CM |
257 | if (!fs_devices) |
258 | return -ENOMEM; | |
259 | INIT_LIST_HEAD(&fs_devices->devices); | |
b3075717 | 260 | INIT_LIST_HEAD(&fs_devices->alloc_list); |
8a4b83cc CM |
261 | list_add(&fs_devices->list, &fs_uuids); |
262 | memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); | |
263 | fs_devices->latest_devid = devid; | |
264 | fs_devices->latest_trans = found_transid; | |
8a4b83cc CM |
265 | device = NULL; |
266 | } else { | |
a443755f CM |
267 | device = __find_device(&fs_devices->devices, devid, |
268 | disk_super->dev_item.uuid); | |
8a4b83cc CM |
269 | } |
270 | if (!device) { | |
2b82032c YZ |
271 | if (fs_devices->opened) |
272 | return -EBUSY; | |
273 | ||
8a4b83cc CM |
274 | device = kzalloc(sizeof(*device), GFP_NOFS); |
275 | if (!device) { | |
276 | /* we can safely leave the fs_devices entry around */ | |
277 | return -ENOMEM; | |
278 | } | |
279 | device->devid = devid; | |
8b712842 | 280 | device->work.func = pending_bios_fn; |
a443755f CM |
281 | memcpy(device->uuid, disk_super->dev_item.uuid, |
282 | BTRFS_UUID_SIZE); | |
f2984462 | 283 | device->barriers = 1; |
b248a415 | 284 | spin_lock_init(&device->io_lock); |
8a4b83cc CM |
285 | device->name = kstrdup(path, GFP_NOFS); |
286 | if (!device->name) { | |
287 | kfree(device); | |
288 | return -ENOMEM; | |
289 | } | |
2b82032c | 290 | INIT_LIST_HEAD(&device->dev_alloc_list); |
8a4b83cc | 291 | list_add(&device->dev_list, &fs_devices->devices); |
2b82032c | 292 | device->fs_devices = fs_devices; |
8a4b83cc CM |
293 | fs_devices->num_devices++; |
294 | } | |
295 | ||
296 | if (found_transid > fs_devices->latest_trans) { | |
297 | fs_devices->latest_devid = devid; | |
298 | fs_devices->latest_trans = found_transid; | |
299 | } | |
8a4b83cc CM |
300 | *fs_devices_ret = fs_devices; |
301 | return 0; | |
302 | } | |
303 | ||
e4404d6e YZ |
304 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
305 | { | |
306 | struct btrfs_fs_devices *fs_devices; | |
307 | struct btrfs_device *device; | |
308 | struct btrfs_device *orig_dev; | |
309 | ||
310 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); | |
311 | if (!fs_devices) | |
312 | return ERR_PTR(-ENOMEM); | |
313 | ||
314 | INIT_LIST_HEAD(&fs_devices->devices); | |
315 | INIT_LIST_HEAD(&fs_devices->alloc_list); | |
316 | INIT_LIST_HEAD(&fs_devices->list); | |
317 | fs_devices->latest_devid = orig->latest_devid; | |
318 | fs_devices->latest_trans = orig->latest_trans; | |
319 | memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid)); | |
320 | ||
321 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { | |
322 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
323 | if (!device) | |
324 | goto error; | |
325 | ||
326 | device->name = kstrdup(orig_dev->name, GFP_NOFS); | |
327 | if (!device->name) | |
328 | goto error; | |
329 | ||
330 | device->devid = orig_dev->devid; | |
331 | device->work.func = pending_bios_fn; | |
332 | memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid)); | |
333 | device->barriers = 1; | |
334 | spin_lock_init(&device->io_lock); | |
335 | INIT_LIST_HEAD(&device->dev_list); | |
336 | INIT_LIST_HEAD(&device->dev_alloc_list); | |
337 | ||
338 | list_add(&device->dev_list, &fs_devices->devices); | |
339 | device->fs_devices = fs_devices; | |
340 | fs_devices->num_devices++; | |
341 | } | |
342 | return fs_devices; | |
343 | error: | |
344 | free_fs_devices(fs_devices); | |
345 | return ERR_PTR(-ENOMEM); | |
346 | } | |
347 | ||
dfe25020 CM |
348 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices) |
349 | { | |
c6e30871 | 350 | struct btrfs_device *device, *next; |
dfe25020 CM |
351 | |
352 | mutex_lock(&uuid_mutex); | |
353 | again: | |
c6e30871 | 354 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
2b82032c YZ |
355 | if (device->in_fs_metadata) |
356 | continue; | |
357 | ||
358 | if (device->bdev) { | |
15916de8 | 359 | close_bdev_exclusive(device->bdev, device->mode); |
2b82032c YZ |
360 | device->bdev = NULL; |
361 | fs_devices->open_devices--; | |
362 | } | |
363 | if (device->writeable) { | |
364 | list_del_init(&device->dev_alloc_list); | |
365 | device->writeable = 0; | |
366 | fs_devices->rw_devices--; | |
367 | } | |
e4404d6e YZ |
368 | list_del_init(&device->dev_list); |
369 | fs_devices->num_devices--; | |
370 | kfree(device->name); | |
371 | kfree(device); | |
dfe25020 | 372 | } |
2b82032c YZ |
373 | |
374 | if (fs_devices->seed) { | |
375 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
376 | goto again; |
377 | } | |
378 | ||
dfe25020 CM |
379 | mutex_unlock(&uuid_mutex); |
380 | return 0; | |
381 | } | |
a0af469b | 382 | |
2b82032c | 383 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 384 | { |
8a4b83cc | 385 | struct btrfs_device *device; |
e4404d6e | 386 | |
2b82032c YZ |
387 | if (--fs_devices->opened > 0) |
388 | return 0; | |
8a4b83cc | 389 | |
c6e30871 | 390 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
8a4b83cc | 391 | if (device->bdev) { |
15916de8 | 392 | close_bdev_exclusive(device->bdev, device->mode); |
a0af469b | 393 | fs_devices->open_devices--; |
8a4b83cc | 394 | } |
2b82032c YZ |
395 | if (device->writeable) { |
396 | list_del_init(&device->dev_alloc_list); | |
397 | fs_devices->rw_devices--; | |
398 | } | |
399 | ||
8a4b83cc | 400 | device->bdev = NULL; |
2b82032c | 401 | device->writeable = 0; |
dfe25020 | 402 | device->in_fs_metadata = 0; |
8a4b83cc | 403 | } |
e4404d6e YZ |
404 | WARN_ON(fs_devices->open_devices); |
405 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
406 | fs_devices->opened = 0; |
407 | fs_devices->seeding = 0; | |
2b82032c | 408 | |
8a4b83cc CM |
409 | return 0; |
410 | } | |
411 | ||
2b82032c YZ |
412 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
413 | { | |
e4404d6e | 414 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
415 | int ret; |
416 | ||
417 | mutex_lock(&uuid_mutex); | |
418 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
419 | if (!fs_devices->opened) { |
420 | seed_devices = fs_devices->seed; | |
421 | fs_devices->seed = NULL; | |
422 | } | |
2b82032c | 423 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
424 | |
425 | while (seed_devices) { | |
426 | fs_devices = seed_devices; | |
427 | seed_devices = fs_devices->seed; | |
428 | __btrfs_close_devices(fs_devices); | |
429 | free_fs_devices(fs_devices); | |
430 | } | |
2b82032c YZ |
431 | return ret; |
432 | } | |
433 | ||
e4404d6e YZ |
434 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
435 | fmode_t flags, void *holder) | |
8a4b83cc CM |
436 | { |
437 | struct block_device *bdev; | |
438 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 439 | struct btrfs_device *device; |
a0af469b CM |
440 | struct block_device *latest_bdev = NULL; |
441 | struct buffer_head *bh; | |
442 | struct btrfs_super_block *disk_super; | |
443 | u64 latest_devid = 0; | |
444 | u64 latest_transid = 0; | |
a0af469b | 445 | u64 devid; |
2b82032c | 446 | int seeding = 1; |
a0af469b | 447 | int ret = 0; |
8a4b83cc | 448 | |
c6e30871 | 449 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
450 | if (device->bdev) |
451 | continue; | |
dfe25020 CM |
452 | if (!device->name) |
453 | continue; | |
454 | ||
15916de8 | 455 | bdev = open_bdev_exclusive(device->name, flags, holder); |
8a4b83cc | 456 | if (IS_ERR(bdev)) { |
d397712b | 457 | printk(KERN_INFO "open %s failed\n", device->name); |
a0af469b | 458 | goto error; |
8a4b83cc | 459 | } |
a061fc8d | 460 | set_blocksize(bdev, 4096); |
a0af469b | 461 | |
a512bbf8 | 462 | bh = btrfs_read_dev_super(bdev); |
a0af469b CM |
463 | if (!bh) |
464 | goto error_close; | |
465 | ||
466 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a0af469b CM |
467 | devid = le64_to_cpu(disk_super->dev_item.devid); |
468 | if (devid != device->devid) | |
469 | goto error_brelse; | |
470 | ||
2b82032c YZ |
471 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
472 | BTRFS_UUID_SIZE)) | |
473 | goto error_brelse; | |
474 | ||
475 | device->generation = btrfs_super_generation(disk_super); | |
476 | if (!latest_transid || device->generation > latest_transid) { | |
a0af469b | 477 | latest_devid = devid; |
2b82032c | 478 | latest_transid = device->generation; |
a0af469b CM |
479 | latest_bdev = bdev; |
480 | } | |
481 | ||
2b82032c YZ |
482 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
483 | device->writeable = 0; | |
484 | } else { | |
485 | device->writeable = !bdev_read_only(bdev); | |
486 | seeding = 0; | |
487 | } | |
488 | ||
8a4b83cc | 489 | device->bdev = bdev; |
dfe25020 | 490 | device->in_fs_metadata = 0; |
15916de8 CM |
491 | device->mode = flags; |
492 | ||
a0af469b | 493 | fs_devices->open_devices++; |
2b82032c YZ |
494 | if (device->writeable) { |
495 | fs_devices->rw_devices++; | |
496 | list_add(&device->dev_alloc_list, | |
497 | &fs_devices->alloc_list); | |
498 | } | |
a0af469b | 499 | continue; |
a061fc8d | 500 | |
a0af469b CM |
501 | error_brelse: |
502 | brelse(bh); | |
503 | error_close: | |
97288f2c | 504 | close_bdev_exclusive(bdev, FMODE_READ); |
a0af469b CM |
505 | error: |
506 | continue; | |
8a4b83cc | 507 | } |
a0af469b CM |
508 | if (fs_devices->open_devices == 0) { |
509 | ret = -EIO; | |
510 | goto out; | |
511 | } | |
2b82032c YZ |
512 | fs_devices->seeding = seeding; |
513 | fs_devices->opened = 1; | |
a0af469b CM |
514 | fs_devices->latest_bdev = latest_bdev; |
515 | fs_devices->latest_devid = latest_devid; | |
516 | fs_devices->latest_trans = latest_transid; | |
2b82032c | 517 | fs_devices->total_rw_bytes = 0; |
a0af469b | 518 | out: |
2b82032c YZ |
519 | return ret; |
520 | } | |
521 | ||
522 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 523 | fmode_t flags, void *holder) |
2b82032c YZ |
524 | { |
525 | int ret; | |
526 | ||
527 | mutex_lock(&uuid_mutex); | |
528 | if (fs_devices->opened) { | |
e4404d6e YZ |
529 | fs_devices->opened++; |
530 | ret = 0; | |
2b82032c | 531 | } else { |
15916de8 | 532 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 533 | } |
8a4b83cc | 534 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
535 | return ret; |
536 | } | |
537 | ||
97288f2c | 538 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
539 | struct btrfs_fs_devices **fs_devices_ret) |
540 | { | |
541 | struct btrfs_super_block *disk_super; | |
542 | struct block_device *bdev; | |
543 | struct buffer_head *bh; | |
544 | int ret; | |
545 | u64 devid; | |
f2984462 | 546 | u64 transid; |
8a4b83cc CM |
547 | |
548 | mutex_lock(&uuid_mutex); | |
549 | ||
15916de8 | 550 | bdev = open_bdev_exclusive(path, flags, holder); |
8a4b83cc CM |
551 | |
552 | if (IS_ERR(bdev)) { | |
8a4b83cc CM |
553 | ret = PTR_ERR(bdev); |
554 | goto error; | |
555 | } | |
556 | ||
557 | ret = set_blocksize(bdev, 4096); | |
558 | if (ret) | |
559 | goto error_close; | |
a512bbf8 | 560 | bh = btrfs_read_dev_super(bdev); |
8a4b83cc CM |
561 | if (!bh) { |
562 | ret = -EIO; | |
563 | goto error_close; | |
564 | } | |
565 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
8a4b83cc | 566 | devid = le64_to_cpu(disk_super->dev_item.devid); |
f2984462 | 567 | transid = btrfs_super_generation(disk_super); |
7ae9c09d | 568 | if (disk_super->label[0]) |
d397712b | 569 | printk(KERN_INFO "device label %s ", disk_super->label); |
7ae9c09d CM |
570 | else { |
571 | /* FIXME, make a readl uuid parser */ | |
d397712b | 572 | printk(KERN_INFO "device fsid %llx-%llx ", |
7ae9c09d CM |
573 | *(unsigned long long *)disk_super->fsid, |
574 | *(unsigned long long *)(disk_super->fsid + 8)); | |
575 | } | |
119e10cf | 576 | printk(KERN_CONT "devid %llu transid %llu %s\n", |
d397712b | 577 | (unsigned long long)devid, (unsigned long long)transid, path); |
8a4b83cc CM |
578 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
579 | ||
8a4b83cc CM |
580 | brelse(bh); |
581 | error_close: | |
15916de8 | 582 | close_bdev_exclusive(bdev, flags); |
8a4b83cc CM |
583 | error: |
584 | mutex_unlock(&uuid_mutex); | |
585 | return ret; | |
586 | } | |
0b86a832 CM |
587 | |
588 | /* | |
589 | * this uses a pretty simple search, the expectation is that it is | |
590 | * called very infrequently and that a given device has a small number | |
591 | * of extents | |
592 | */ | |
a1b32a59 CM |
593 | static noinline int find_free_dev_extent(struct btrfs_trans_handle *trans, |
594 | struct btrfs_device *device, | |
a1b32a59 | 595 | u64 num_bytes, u64 *start) |
0b86a832 CM |
596 | { |
597 | struct btrfs_key key; | |
598 | struct btrfs_root *root = device->dev_root; | |
599 | struct btrfs_dev_extent *dev_extent = NULL; | |
2b82032c | 600 | struct btrfs_path *path; |
0b86a832 CM |
601 | u64 hole_size = 0; |
602 | u64 last_byte = 0; | |
603 | u64 search_start = 0; | |
604 | u64 search_end = device->total_bytes; | |
605 | int ret; | |
606 | int slot = 0; | |
607 | int start_found; | |
608 | struct extent_buffer *l; | |
609 | ||
2b82032c YZ |
610 | path = btrfs_alloc_path(); |
611 | if (!path) | |
612 | return -ENOMEM; | |
0b86a832 | 613 | path->reada = 2; |
2b82032c | 614 | start_found = 0; |
0b86a832 CM |
615 | |
616 | /* FIXME use last free of some kind */ | |
617 | ||
8a4b83cc CM |
618 | /* we don't want to overwrite the superblock on the drive, |
619 | * so we make sure to start at an offset of at least 1MB | |
620 | */ | |
621 | search_start = max((u64)1024 * 1024, search_start); | |
8f18cf13 CM |
622 | |
623 | if (root->fs_info->alloc_start + num_bytes <= device->total_bytes) | |
624 | search_start = max(root->fs_info->alloc_start, search_start); | |
625 | ||
0b86a832 CM |
626 | key.objectid = device->devid; |
627 | key.offset = search_start; | |
628 | key.type = BTRFS_DEV_EXTENT_KEY; | |
629 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
630 | if (ret < 0) | |
631 | goto error; | |
632 | ret = btrfs_previous_item(root, path, 0, key.type); | |
633 | if (ret < 0) | |
634 | goto error; | |
635 | l = path->nodes[0]; | |
636 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
637 | while (1) { | |
638 | l = path->nodes[0]; | |
639 | slot = path->slots[0]; | |
640 | if (slot >= btrfs_header_nritems(l)) { | |
641 | ret = btrfs_next_leaf(root, path); | |
642 | if (ret == 0) | |
643 | continue; | |
644 | if (ret < 0) | |
645 | goto error; | |
646 | no_more_items: | |
647 | if (!start_found) { | |
648 | if (search_start >= search_end) { | |
649 | ret = -ENOSPC; | |
650 | goto error; | |
651 | } | |
652 | *start = search_start; | |
653 | start_found = 1; | |
654 | goto check_pending; | |
655 | } | |
656 | *start = last_byte > search_start ? | |
657 | last_byte : search_start; | |
658 | if (search_end <= *start) { | |
659 | ret = -ENOSPC; | |
660 | goto error; | |
661 | } | |
662 | goto check_pending; | |
663 | } | |
664 | btrfs_item_key_to_cpu(l, &key, slot); | |
665 | ||
666 | if (key.objectid < device->devid) | |
667 | goto next; | |
668 | ||
669 | if (key.objectid > device->devid) | |
670 | goto no_more_items; | |
671 | ||
672 | if (key.offset >= search_start && key.offset > last_byte && | |
673 | start_found) { | |
674 | if (last_byte < search_start) | |
675 | last_byte = search_start; | |
676 | hole_size = key.offset - last_byte; | |
677 | if (key.offset > last_byte && | |
678 | hole_size >= num_bytes) { | |
679 | *start = last_byte; | |
680 | goto check_pending; | |
681 | } | |
682 | } | |
d397712b | 683 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) |
0b86a832 | 684 | goto next; |
0b86a832 CM |
685 | |
686 | start_found = 1; | |
687 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
688 | last_byte = key.offset + btrfs_dev_extent_length(l, dev_extent); | |
689 | next: | |
690 | path->slots[0]++; | |
691 | cond_resched(); | |
692 | } | |
693 | check_pending: | |
694 | /* we have to make sure we didn't find an extent that has already | |
695 | * been allocated by the map tree or the original allocation | |
696 | */ | |
0b86a832 CM |
697 | BUG_ON(*start < search_start); |
698 | ||
6324fbf3 | 699 | if (*start + num_bytes > search_end) { |
0b86a832 CM |
700 | ret = -ENOSPC; |
701 | goto error; | |
702 | } | |
703 | /* check for pending inserts here */ | |
2b82032c | 704 | ret = 0; |
0b86a832 CM |
705 | |
706 | error: | |
2b82032c | 707 | btrfs_free_path(path); |
0b86a832 CM |
708 | return ret; |
709 | } | |
710 | ||
b2950863 | 711 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
712 | struct btrfs_device *device, |
713 | u64 start) | |
714 | { | |
715 | int ret; | |
716 | struct btrfs_path *path; | |
717 | struct btrfs_root *root = device->dev_root; | |
718 | struct btrfs_key key; | |
a061fc8d CM |
719 | struct btrfs_key found_key; |
720 | struct extent_buffer *leaf = NULL; | |
721 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
722 | |
723 | path = btrfs_alloc_path(); | |
724 | if (!path) | |
725 | return -ENOMEM; | |
726 | ||
727 | key.objectid = device->devid; | |
728 | key.offset = start; | |
729 | key.type = BTRFS_DEV_EXTENT_KEY; | |
730 | ||
731 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
a061fc8d CM |
732 | if (ret > 0) { |
733 | ret = btrfs_previous_item(root, path, key.objectid, | |
734 | BTRFS_DEV_EXTENT_KEY); | |
735 | BUG_ON(ret); | |
736 | leaf = path->nodes[0]; | |
737 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
738 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
739 | struct btrfs_dev_extent); | |
740 | BUG_ON(found_key.offset > start || found_key.offset + | |
741 | btrfs_dev_extent_length(leaf, extent) < start); | |
742 | ret = 0; | |
743 | } else if (ret == 0) { | |
744 | leaf = path->nodes[0]; | |
745 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
746 | struct btrfs_dev_extent); | |
747 | } | |
8f18cf13 CM |
748 | BUG_ON(ret); |
749 | ||
dfe25020 CM |
750 | if (device->bytes_used > 0) |
751 | device->bytes_used -= btrfs_dev_extent_length(leaf, extent); | |
8f18cf13 CM |
752 | ret = btrfs_del_item(trans, root, path); |
753 | BUG_ON(ret); | |
754 | ||
755 | btrfs_free_path(path); | |
756 | return ret; | |
757 | } | |
758 | ||
2b82032c | 759 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
0b86a832 | 760 | struct btrfs_device *device, |
e17cade2 | 761 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 762 | u64 chunk_offset, u64 start, u64 num_bytes) |
0b86a832 CM |
763 | { |
764 | int ret; | |
765 | struct btrfs_path *path; | |
766 | struct btrfs_root *root = device->dev_root; | |
767 | struct btrfs_dev_extent *extent; | |
768 | struct extent_buffer *leaf; | |
769 | struct btrfs_key key; | |
770 | ||
dfe25020 | 771 | WARN_ON(!device->in_fs_metadata); |
0b86a832 CM |
772 | path = btrfs_alloc_path(); |
773 | if (!path) | |
774 | return -ENOMEM; | |
775 | ||
0b86a832 | 776 | key.objectid = device->devid; |
2b82032c | 777 | key.offset = start; |
0b86a832 CM |
778 | key.type = BTRFS_DEV_EXTENT_KEY; |
779 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
780 | sizeof(*extent)); | |
781 | BUG_ON(ret); | |
782 | ||
783 | leaf = path->nodes[0]; | |
784 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
785 | struct btrfs_dev_extent); | |
e17cade2 CM |
786 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
787 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
788 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
789 | ||
790 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
791 | (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), | |
792 | BTRFS_UUID_SIZE); | |
793 | ||
0b86a832 CM |
794 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
795 | btrfs_mark_buffer_dirty(leaf); | |
0b86a832 CM |
796 | btrfs_free_path(path); |
797 | return ret; | |
798 | } | |
799 | ||
a1b32a59 CM |
800 | static noinline int find_next_chunk(struct btrfs_root *root, |
801 | u64 objectid, u64 *offset) | |
0b86a832 CM |
802 | { |
803 | struct btrfs_path *path; | |
804 | int ret; | |
805 | struct btrfs_key key; | |
e17cade2 | 806 | struct btrfs_chunk *chunk; |
0b86a832 CM |
807 | struct btrfs_key found_key; |
808 | ||
809 | path = btrfs_alloc_path(); | |
810 | BUG_ON(!path); | |
811 | ||
e17cade2 | 812 | key.objectid = objectid; |
0b86a832 CM |
813 | key.offset = (u64)-1; |
814 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
815 | ||
816 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
817 | if (ret < 0) | |
818 | goto error; | |
819 | ||
820 | BUG_ON(ret == 0); | |
821 | ||
822 | ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY); | |
823 | if (ret) { | |
e17cade2 | 824 | *offset = 0; |
0b86a832 CM |
825 | } else { |
826 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
827 | path->slots[0]); | |
e17cade2 CM |
828 | if (found_key.objectid != objectid) |
829 | *offset = 0; | |
830 | else { | |
831 | chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
832 | struct btrfs_chunk); | |
833 | *offset = found_key.offset + | |
834 | btrfs_chunk_length(path->nodes[0], chunk); | |
835 | } | |
0b86a832 CM |
836 | } |
837 | ret = 0; | |
838 | error: | |
839 | btrfs_free_path(path); | |
840 | return ret; | |
841 | } | |
842 | ||
2b82032c | 843 | static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid) |
0b86a832 CM |
844 | { |
845 | int ret; | |
846 | struct btrfs_key key; | |
847 | struct btrfs_key found_key; | |
2b82032c YZ |
848 | struct btrfs_path *path; |
849 | ||
850 | root = root->fs_info->chunk_root; | |
851 | ||
852 | path = btrfs_alloc_path(); | |
853 | if (!path) | |
854 | return -ENOMEM; | |
0b86a832 CM |
855 | |
856 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
857 | key.type = BTRFS_DEV_ITEM_KEY; | |
858 | key.offset = (u64)-1; | |
859 | ||
860 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
861 | if (ret < 0) | |
862 | goto error; | |
863 | ||
864 | BUG_ON(ret == 0); | |
865 | ||
866 | ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID, | |
867 | BTRFS_DEV_ITEM_KEY); | |
868 | if (ret) { | |
869 | *objectid = 1; | |
870 | } else { | |
871 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
872 | path->slots[0]); | |
873 | *objectid = found_key.offset + 1; | |
874 | } | |
875 | ret = 0; | |
876 | error: | |
2b82032c | 877 | btrfs_free_path(path); |
0b86a832 CM |
878 | return ret; |
879 | } | |
880 | ||
881 | /* | |
882 | * the device information is stored in the chunk root | |
883 | * the btrfs_device struct should be fully filled in | |
884 | */ | |
885 | int btrfs_add_device(struct btrfs_trans_handle *trans, | |
886 | struct btrfs_root *root, | |
887 | struct btrfs_device *device) | |
888 | { | |
889 | int ret; | |
890 | struct btrfs_path *path; | |
891 | struct btrfs_dev_item *dev_item; | |
892 | struct extent_buffer *leaf; | |
893 | struct btrfs_key key; | |
894 | unsigned long ptr; | |
0b86a832 CM |
895 | |
896 | root = root->fs_info->chunk_root; | |
897 | ||
898 | path = btrfs_alloc_path(); | |
899 | if (!path) | |
900 | return -ENOMEM; | |
901 | ||
0b86a832 CM |
902 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
903 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 904 | key.offset = device->devid; |
0b86a832 CM |
905 | |
906 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 907 | sizeof(*dev_item)); |
0b86a832 CM |
908 | if (ret) |
909 | goto out; | |
910 | ||
911 | leaf = path->nodes[0]; | |
912 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
913 | ||
914 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 915 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
916 | btrfs_set_device_type(leaf, dev_item, device->type); |
917 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
918 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
919 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
920 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
921 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
e17cade2 CM |
922 | btrfs_set_device_group(leaf, dev_item, 0); |
923 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
924 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 925 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 926 | |
0b86a832 | 927 | ptr = (unsigned long)btrfs_device_uuid(dev_item); |
e17cade2 | 928 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
2b82032c YZ |
929 | ptr = (unsigned long)btrfs_device_fsid(dev_item); |
930 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); | |
0b86a832 | 931 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 932 | |
2b82032c | 933 | ret = 0; |
0b86a832 CM |
934 | out: |
935 | btrfs_free_path(path); | |
936 | return ret; | |
937 | } | |
8f18cf13 | 938 | |
a061fc8d CM |
939 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
940 | struct btrfs_device *device) | |
941 | { | |
942 | int ret; | |
943 | struct btrfs_path *path; | |
a061fc8d | 944 | struct btrfs_key key; |
a061fc8d CM |
945 | struct btrfs_trans_handle *trans; |
946 | ||
947 | root = root->fs_info->chunk_root; | |
948 | ||
949 | path = btrfs_alloc_path(); | |
950 | if (!path) | |
951 | return -ENOMEM; | |
952 | ||
953 | trans = btrfs_start_transaction(root, 1); | |
954 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
955 | key.type = BTRFS_DEV_ITEM_KEY; | |
956 | key.offset = device->devid; | |
7d9eb12c | 957 | lock_chunks(root); |
a061fc8d CM |
958 | |
959 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
960 | if (ret < 0) | |
961 | goto out; | |
962 | ||
963 | if (ret > 0) { | |
964 | ret = -ENOENT; | |
965 | goto out; | |
966 | } | |
967 | ||
968 | ret = btrfs_del_item(trans, root, path); | |
969 | if (ret) | |
970 | goto out; | |
a061fc8d CM |
971 | out: |
972 | btrfs_free_path(path); | |
7d9eb12c | 973 | unlock_chunks(root); |
a061fc8d CM |
974 | btrfs_commit_transaction(trans, root); |
975 | return ret; | |
976 | } | |
977 | ||
978 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
979 | { | |
980 | struct btrfs_device *device; | |
2b82032c | 981 | struct btrfs_device *next_device; |
a061fc8d | 982 | struct block_device *bdev; |
dfe25020 | 983 | struct buffer_head *bh = NULL; |
a061fc8d CM |
984 | struct btrfs_super_block *disk_super; |
985 | u64 all_avail; | |
986 | u64 devid; | |
2b82032c YZ |
987 | u64 num_devices; |
988 | u8 *dev_uuid; | |
a061fc8d CM |
989 | int ret = 0; |
990 | ||
a061fc8d | 991 | mutex_lock(&uuid_mutex); |
7d9eb12c | 992 | mutex_lock(&root->fs_info->volume_mutex); |
a061fc8d CM |
993 | |
994 | all_avail = root->fs_info->avail_data_alloc_bits | | |
995 | root->fs_info->avail_system_alloc_bits | | |
996 | root->fs_info->avail_metadata_alloc_bits; | |
997 | ||
998 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && | |
2b82032c | 999 | root->fs_info->fs_devices->rw_devices <= 4) { |
d397712b CM |
1000 | printk(KERN_ERR "btrfs: unable to go below four devices " |
1001 | "on raid10\n"); | |
a061fc8d CM |
1002 | ret = -EINVAL; |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && | |
2b82032c | 1007 | root->fs_info->fs_devices->rw_devices <= 2) { |
d397712b CM |
1008 | printk(KERN_ERR "btrfs: unable to go below two " |
1009 | "devices on raid1\n"); | |
a061fc8d CM |
1010 | ret = -EINVAL; |
1011 | goto out; | |
1012 | } | |
1013 | ||
dfe25020 | 1014 | if (strcmp(device_path, "missing") == 0) { |
dfe25020 CM |
1015 | struct list_head *devices; |
1016 | struct btrfs_device *tmp; | |
a061fc8d | 1017 | |
dfe25020 CM |
1018 | device = NULL; |
1019 | devices = &root->fs_info->fs_devices->devices; | |
c6e30871 | 1020 | list_for_each_entry(tmp, devices, dev_list) { |
dfe25020 CM |
1021 | if (tmp->in_fs_metadata && !tmp->bdev) { |
1022 | device = tmp; | |
1023 | break; | |
1024 | } | |
1025 | } | |
1026 | bdev = NULL; | |
1027 | bh = NULL; | |
1028 | disk_super = NULL; | |
1029 | if (!device) { | |
d397712b CM |
1030 | printk(KERN_ERR "btrfs: no missing devices found to " |
1031 | "remove\n"); | |
dfe25020 CM |
1032 | goto out; |
1033 | } | |
dfe25020 | 1034 | } else { |
97288f2c | 1035 | bdev = open_bdev_exclusive(device_path, FMODE_READ, |
dfe25020 CM |
1036 | root->fs_info->bdev_holder); |
1037 | if (IS_ERR(bdev)) { | |
1038 | ret = PTR_ERR(bdev); | |
1039 | goto out; | |
1040 | } | |
a061fc8d | 1041 | |
2b82032c | 1042 | set_blocksize(bdev, 4096); |
a512bbf8 | 1043 | bh = btrfs_read_dev_super(bdev); |
dfe25020 CM |
1044 | if (!bh) { |
1045 | ret = -EIO; | |
1046 | goto error_close; | |
1047 | } | |
1048 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
dfe25020 | 1049 | devid = le64_to_cpu(disk_super->dev_item.devid); |
2b82032c YZ |
1050 | dev_uuid = disk_super->dev_item.uuid; |
1051 | device = btrfs_find_device(root, devid, dev_uuid, | |
1052 | disk_super->fsid); | |
dfe25020 CM |
1053 | if (!device) { |
1054 | ret = -ENOENT; | |
1055 | goto error_brelse; | |
1056 | } | |
2b82032c | 1057 | } |
dfe25020 | 1058 | |
2b82032c | 1059 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
d397712b CM |
1060 | printk(KERN_ERR "btrfs: unable to remove the only writeable " |
1061 | "device\n"); | |
2b82032c YZ |
1062 | ret = -EINVAL; |
1063 | goto error_brelse; | |
1064 | } | |
1065 | ||
1066 | if (device->writeable) { | |
1067 | list_del_init(&device->dev_alloc_list); | |
1068 | root->fs_info->fs_devices->rw_devices--; | |
dfe25020 | 1069 | } |
a061fc8d CM |
1070 | |
1071 | ret = btrfs_shrink_device(device, 0); | |
1072 | if (ret) | |
1073 | goto error_brelse; | |
1074 | ||
a061fc8d CM |
1075 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
1076 | if (ret) | |
1077 | goto error_brelse; | |
1078 | ||
2b82032c | 1079 | device->in_fs_metadata = 0; |
e4404d6e YZ |
1080 | list_del_init(&device->dev_list); |
1081 | device->fs_devices->num_devices--; | |
2b82032c YZ |
1082 | |
1083 | next_device = list_entry(root->fs_info->fs_devices->devices.next, | |
1084 | struct btrfs_device, dev_list); | |
1085 | if (device->bdev == root->fs_info->sb->s_bdev) | |
1086 | root->fs_info->sb->s_bdev = next_device->bdev; | |
1087 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) | |
1088 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1089 | ||
e4404d6e YZ |
1090 | if (device->bdev) { |
1091 | close_bdev_exclusive(device->bdev, device->mode); | |
1092 | device->bdev = NULL; | |
1093 | device->fs_devices->open_devices--; | |
1094 | } | |
1095 | ||
2b82032c YZ |
1096 | num_devices = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
1097 | btrfs_set_super_num_devices(&root->fs_info->super_copy, num_devices); | |
1098 | ||
e4404d6e YZ |
1099 | if (device->fs_devices->open_devices == 0) { |
1100 | struct btrfs_fs_devices *fs_devices; | |
1101 | fs_devices = root->fs_info->fs_devices; | |
1102 | while (fs_devices) { | |
1103 | if (fs_devices->seed == device->fs_devices) | |
1104 | break; | |
1105 | fs_devices = fs_devices->seed; | |
2b82032c | 1106 | } |
e4404d6e YZ |
1107 | fs_devices->seed = device->fs_devices->seed; |
1108 | device->fs_devices->seed = NULL; | |
1109 | __btrfs_close_devices(device->fs_devices); | |
1110 | free_fs_devices(device->fs_devices); | |
2b82032c YZ |
1111 | } |
1112 | ||
1113 | /* | |
1114 | * at this point, the device is zero sized. We want to | |
1115 | * remove it from the devices list and zero out the old super | |
1116 | */ | |
1117 | if (device->writeable) { | |
dfe25020 CM |
1118 | /* make sure this device isn't detected as part of |
1119 | * the FS anymore | |
1120 | */ | |
1121 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
1122 | set_buffer_dirty(bh); | |
1123 | sync_dirty_buffer(bh); | |
dfe25020 | 1124 | } |
a061fc8d CM |
1125 | |
1126 | kfree(device->name); | |
1127 | kfree(device); | |
1128 | ret = 0; | |
a061fc8d CM |
1129 | |
1130 | error_brelse: | |
1131 | brelse(bh); | |
1132 | error_close: | |
dfe25020 | 1133 | if (bdev) |
97288f2c | 1134 | close_bdev_exclusive(bdev, FMODE_READ); |
a061fc8d | 1135 | out: |
7d9eb12c | 1136 | mutex_unlock(&root->fs_info->volume_mutex); |
a061fc8d | 1137 | mutex_unlock(&uuid_mutex); |
a061fc8d CM |
1138 | return ret; |
1139 | } | |
1140 | ||
2b82032c YZ |
1141 | /* |
1142 | * does all the dirty work required for changing file system's UUID. | |
1143 | */ | |
1144 | static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans, | |
1145 | struct btrfs_root *root) | |
1146 | { | |
1147 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
1148 | struct btrfs_fs_devices *old_devices; | |
e4404d6e | 1149 | struct btrfs_fs_devices *seed_devices; |
2b82032c YZ |
1150 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
1151 | struct btrfs_device *device; | |
1152 | u64 super_flags; | |
1153 | ||
1154 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 1155 | if (!fs_devices->seeding) |
2b82032c YZ |
1156 | return -EINVAL; |
1157 | ||
e4404d6e YZ |
1158 | seed_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
1159 | if (!seed_devices) | |
2b82032c YZ |
1160 | return -ENOMEM; |
1161 | ||
e4404d6e YZ |
1162 | old_devices = clone_fs_devices(fs_devices); |
1163 | if (IS_ERR(old_devices)) { | |
1164 | kfree(seed_devices); | |
1165 | return PTR_ERR(old_devices); | |
2b82032c | 1166 | } |
e4404d6e | 1167 | |
2b82032c YZ |
1168 | list_add(&old_devices->list, &fs_uuids); |
1169 | ||
e4404d6e YZ |
1170 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
1171 | seed_devices->opened = 1; | |
1172 | INIT_LIST_HEAD(&seed_devices->devices); | |
1173 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
1174 | list_splice_init(&fs_devices->devices, &seed_devices->devices); | |
1175 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); | |
1176 | list_for_each_entry(device, &seed_devices->devices, dev_list) { | |
1177 | device->fs_devices = seed_devices; | |
1178 | } | |
1179 | ||
2b82032c YZ |
1180 | fs_devices->seeding = 0; |
1181 | fs_devices->num_devices = 0; | |
1182 | fs_devices->open_devices = 0; | |
e4404d6e | 1183 | fs_devices->seed = seed_devices; |
2b82032c YZ |
1184 | |
1185 | generate_random_uuid(fs_devices->fsid); | |
1186 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1187 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1188 | super_flags = btrfs_super_flags(disk_super) & | |
1189 | ~BTRFS_SUPER_FLAG_SEEDING; | |
1190 | btrfs_set_super_flags(disk_super, super_flags); | |
1191 | ||
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * strore the expected generation for seed devices in device items. | |
1197 | */ | |
1198 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
1199 | struct btrfs_root *root) | |
1200 | { | |
1201 | struct btrfs_path *path; | |
1202 | struct extent_buffer *leaf; | |
1203 | struct btrfs_dev_item *dev_item; | |
1204 | struct btrfs_device *device; | |
1205 | struct btrfs_key key; | |
1206 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
1207 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
1208 | u64 devid; | |
1209 | int ret; | |
1210 | ||
1211 | path = btrfs_alloc_path(); | |
1212 | if (!path) | |
1213 | return -ENOMEM; | |
1214 | ||
1215 | root = root->fs_info->chunk_root; | |
1216 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1217 | key.offset = 0; | |
1218 | key.type = BTRFS_DEV_ITEM_KEY; | |
1219 | ||
1220 | while (1) { | |
1221 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1222 | if (ret < 0) | |
1223 | goto error; | |
1224 | ||
1225 | leaf = path->nodes[0]; | |
1226 | next_slot: | |
1227 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1228 | ret = btrfs_next_leaf(root, path); | |
1229 | if (ret > 0) | |
1230 | break; | |
1231 | if (ret < 0) | |
1232 | goto error; | |
1233 | leaf = path->nodes[0]; | |
1234 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1235 | btrfs_release_path(root, path); | |
1236 | continue; | |
1237 | } | |
1238 | ||
1239 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1240 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
1241 | key.type != BTRFS_DEV_ITEM_KEY) | |
1242 | break; | |
1243 | ||
1244 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
1245 | struct btrfs_dev_item); | |
1246 | devid = btrfs_device_id(leaf, dev_item); | |
1247 | read_extent_buffer(leaf, dev_uuid, | |
1248 | (unsigned long)btrfs_device_uuid(dev_item), | |
1249 | BTRFS_UUID_SIZE); | |
1250 | read_extent_buffer(leaf, fs_uuid, | |
1251 | (unsigned long)btrfs_device_fsid(dev_item), | |
1252 | BTRFS_UUID_SIZE); | |
1253 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
1254 | BUG_ON(!device); | |
1255 | ||
1256 | if (device->fs_devices->seeding) { | |
1257 | btrfs_set_device_generation(leaf, dev_item, | |
1258 | device->generation); | |
1259 | btrfs_mark_buffer_dirty(leaf); | |
1260 | } | |
1261 | ||
1262 | path->slots[0]++; | |
1263 | goto next_slot; | |
1264 | } | |
1265 | ret = 0; | |
1266 | error: | |
1267 | btrfs_free_path(path); | |
1268 | return ret; | |
1269 | } | |
1270 | ||
788f20eb CM |
1271 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
1272 | { | |
1273 | struct btrfs_trans_handle *trans; | |
1274 | struct btrfs_device *device; | |
1275 | struct block_device *bdev; | |
788f20eb | 1276 | struct list_head *devices; |
2b82032c | 1277 | struct super_block *sb = root->fs_info->sb; |
788f20eb | 1278 | u64 total_bytes; |
2b82032c | 1279 | int seeding_dev = 0; |
788f20eb CM |
1280 | int ret = 0; |
1281 | ||
2b82032c YZ |
1282 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
1283 | return -EINVAL; | |
788f20eb | 1284 | |
15916de8 | 1285 | bdev = open_bdev_exclusive(device_path, 0, root->fs_info->bdev_holder); |
d397712b | 1286 | if (!bdev) |
788f20eb | 1287 | return -EIO; |
a2135011 | 1288 | |
2b82032c YZ |
1289 | if (root->fs_info->fs_devices->seeding) { |
1290 | seeding_dev = 1; | |
1291 | down_write(&sb->s_umount); | |
1292 | mutex_lock(&uuid_mutex); | |
1293 | } | |
1294 | ||
8c8bee1d | 1295 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
7d9eb12c | 1296 | mutex_lock(&root->fs_info->volume_mutex); |
a2135011 | 1297 | |
788f20eb | 1298 | devices = &root->fs_info->fs_devices->devices; |
c6e30871 | 1299 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
1300 | if (device->bdev == bdev) { |
1301 | ret = -EEXIST; | |
2b82032c | 1302 | goto error; |
788f20eb CM |
1303 | } |
1304 | } | |
1305 | ||
1306 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
1307 | if (!device) { | |
1308 | /* we can safely leave the fs_devices entry around */ | |
1309 | ret = -ENOMEM; | |
2b82032c | 1310 | goto error; |
788f20eb CM |
1311 | } |
1312 | ||
788f20eb CM |
1313 | device->name = kstrdup(device_path, GFP_NOFS); |
1314 | if (!device->name) { | |
1315 | kfree(device); | |
2b82032c YZ |
1316 | ret = -ENOMEM; |
1317 | goto error; | |
788f20eb | 1318 | } |
2b82032c YZ |
1319 | |
1320 | ret = find_next_devid(root, &device->devid); | |
1321 | if (ret) { | |
1322 | kfree(device); | |
1323 | goto error; | |
1324 | } | |
1325 | ||
1326 | trans = btrfs_start_transaction(root, 1); | |
1327 | lock_chunks(root); | |
1328 | ||
1329 | device->barriers = 1; | |
1330 | device->writeable = 1; | |
1331 | device->work.func = pending_bios_fn; | |
1332 | generate_random_uuid(device->uuid); | |
1333 | spin_lock_init(&device->io_lock); | |
1334 | device->generation = trans->transid; | |
788f20eb CM |
1335 | device->io_width = root->sectorsize; |
1336 | device->io_align = root->sectorsize; | |
1337 | device->sector_size = root->sectorsize; | |
1338 | device->total_bytes = i_size_read(bdev->bd_inode); | |
1339 | device->dev_root = root->fs_info->dev_root; | |
1340 | device->bdev = bdev; | |
dfe25020 | 1341 | device->in_fs_metadata = 1; |
15916de8 | 1342 | device->mode = 0; |
2b82032c | 1343 | set_blocksize(device->bdev, 4096); |
788f20eb | 1344 | |
2b82032c YZ |
1345 | if (seeding_dev) { |
1346 | sb->s_flags &= ~MS_RDONLY; | |
1347 | ret = btrfs_prepare_sprout(trans, root); | |
1348 | BUG_ON(ret); | |
1349 | } | |
788f20eb | 1350 | |
2b82032c YZ |
1351 | device->fs_devices = root->fs_info->fs_devices; |
1352 | list_add(&device->dev_list, &root->fs_info->fs_devices->devices); | |
1353 | list_add(&device->dev_alloc_list, | |
1354 | &root->fs_info->fs_devices->alloc_list); | |
1355 | root->fs_info->fs_devices->num_devices++; | |
1356 | root->fs_info->fs_devices->open_devices++; | |
1357 | root->fs_info->fs_devices->rw_devices++; | |
1358 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; | |
325cd4ba | 1359 | |
788f20eb CM |
1360 | total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
1361 | btrfs_set_super_total_bytes(&root->fs_info->super_copy, | |
1362 | total_bytes + device->total_bytes); | |
1363 | ||
1364 | total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy); | |
1365 | btrfs_set_super_num_devices(&root->fs_info->super_copy, | |
1366 | total_bytes + 1); | |
1367 | ||
2b82032c YZ |
1368 | if (seeding_dev) { |
1369 | ret = init_first_rw_device(trans, root, device); | |
1370 | BUG_ON(ret); | |
1371 | ret = btrfs_finish_sprout(trans, root); | |
1372 | BUG_ON(ret); | |
1373 | } else { | |
1374 | ret = btrfs_add_device(trans, root, device); | |
1375 | } | |
1376 | ||
913d952e CM |
1377 | /* |
1378 | * we've got more storage, clear any full flags on the space | |
1379 | * infos | |
1380 | */ | |
1381 | btrfs_clear_space_info_full(root->fs_info); | |
1382 | ||
7d9eb12c | 1383 | unlock_chunks(root); |
2b82032c | 1384 | btrfs_commit_transaction(trans, root); |
a2135011 | 1385 | |
2b82032c YZ |
1386 | if (seeding_dev) { |
1387 | mutex_unlock(&uuid_mutex); | |
1388 | up_write(&sb->s_umount); | |
788f20eb | 1389 | |
2b82032c YZ |
1390 | ret = btrfs_relocate_sys_chunks(root); |
1391 | BUG_ON(ret); | |
1392 | } | |
1393 | out: | |
1394 | mutex_unlock(&root->fs_info->volume_mutex); | |
1395 | return ret; | |
1396 | error: | |
15916de8 | 1397 | close_bdev_exclusive(bdev, 0); |
2b82032c YZ |
1398 | if (seeding_dev) { |
1399 | mutex_unlock(&uuid_mutex); | |
1400 | up_write(&sb->s_umount); | |
1401 | } | |
788f20eb CM |
1402 | goto out; |
1403 | } | |
1404 | ||
d397712b CM |
1405 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
1406 | struct btrfs_device *device) | |
0b86a832 CM |
1407 | { |
1408 | int ret; | |
1409 | struct btrfs_path *path; | |
1410 | struct btrfs_root *root; | |
1411 | struct btrfs_dev_item *dev_item; | |
1412 | struct extent_buffer *leaf; | |
1413 | struct btrfs_key key; | |
1414 | ||
1415 | root = device->dev_root->fs_info->chunk_root; | |
1416 | ||
1417 | path = btrfs_alloc_path(); | |
1418 | if (!path) | |
1419 | return -ENOMEM; | |
1420 | ||
1421 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1422 | key.type = BTRFS_DEV_ITEM_KEY; | |
1423 | key.offset = device->devid; | |
1424 | ||
1425 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1426 | if (ret < 0) | |
1427 | goto out; | |
1428 | ||
1429 | if (ret > 0) { | |
1430 | ret = -ENOENT; | |
1431 | goto out; | |
1432 | } | |
1433 | ||
1434 | leaf = path->nodes[0]; | |
1435 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1436 | ||
1437 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
1438 | btrfs_set_device_type(leaf, dev_item, device->type); | |
1439 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1440 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1441 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
1442 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
1443 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
1444 | btrfs_mark_buffer_dirty(leaf); | |
1445 | ||
1446 | out: | |
1447 | btrfs_free_path(path); | |
1448 | return ret; | |
1449 | } | |
1450 | ||
7d9eb12c | 1451 | static int __btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
1452 | struct btrfs_device *device, u64 new_size) |
1453 | { | |
1454 | struct btrfs_super_block *super_copy = | |
1455 | &device->dev_root->fs_info->super_copy; | |
1456 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
1457 | u64 diff = new_size - device->total_bytes; | |
1458 | ||
2b82032c YZ |
1459 | if (!device->writeable) |
1460 | return -EACCES; | |
1461 | if (new_size <= device->total_bytes) | |
1462 | return -EINVAL; | |
1463 | ||
8f18cf13 | 1464 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
2b82032c YZ |
1465 | device->fs_devices->total_rw_bytes += diff; |
1466 | ||
1467 | device->total_bytes = new_size; | |
4184ea7f CM |
1468 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
1469 | ||
8f18cf13 CM |
1470 | return btrfs_update_device(trans, device); |
1471 | } | |
1472 | ||
7d9eb12c CM |
1473 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
1474 | struct btrfs_device *device, u64 new_size) | |
1475 | { | |
1476 | int ret; | |
1477 | lock_chunks(device->dev_root); | |
1478 | ret = __btrfs_grow_device(trans, device, new_size); | |
1479 | unlock_chunks(device->dev_root); | |
1480 | return ret; | |
1481 | } | |
1482 | ||
8f18cf13 CM |
1483 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, |
1484 | struct btrfs_root *root, | |
1485 | u64 chunk_tree, u64 chunk_objectid, | |
1486 | u64 chunk_offset) | |
1487 | { | |
1488 | int ret; | |
1489 | struct btrfs_path *path; | |
1490 | struct btrfs_key key; | |
1491 | ||
1492 | root = root->fs_info->chunk_root; | |
1493 | path = btrfs_alloc_path(); | |
1494 | if (!path) | |
1495 | return -ENOMEM; | |
1496 | ||
1497 | key.objectid = chunk_objectid; | |
1498 | key.offset = chunk_offset; | |
1499 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1500 | ||
1501 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1502 | BUG_ON(ret); | |
1503 | ||
1504 | ret = btrfs_del_item(trans, root, path); | |
1505 | BUG_ON(ret); | |
1506 | ||
1507 | btrfs_free_path(path); | |
1508 | return 0; | |
1509 | } | |
1510 | ||
b2950863 | 1511 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
8f18cf13 CM |
1512 | chunk_offset) |
1513 | { | |
1514 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
1515 | struct btrfs_disk_key *disk_key; | |
1516 | struct btrfs_chunk *chunk; | |
1517 | u8 *ptr; | |
1518 | int ret = 0; | |
1519 | u32 num_stripes; | |
1520 | u32 array_size; | |
1521 | u32 len = 0; | |
1522 | u32 cur; | |
1523 | struct btrfs_key key; | |
1524 | ||
1525 | array_size = btrfs_super_sys_array_size(super_copy); | |
1526 | ||
1527 | ptr = super_copy->sys_chunk_array; | |
1528 | cur = 0; | |
1529 | ||
1530 | while (cur < array_size) { | |
1531 | disk_key = (struct btrfs_disk_key *)ptr; | |
1532 | btrfs_disk_key_to_cpu(&key, disk_key); | |
1533 | ||
1534 | len = sizeof(*disk_key); | |
1535 | ||
1536 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
1537 | chunk = (struct btrfs_chunk *)(ptr + len); | |
1538 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
1539 | len += btrfs_chunk_item_size(num_stripes); | |
1540 | } else { | |
1541 | ret = -EIO; | |
1542 | break; | |
1543 | } | |
1544 | if (key.objectid == chunk_objectid && | |
1545 | key.offset == chunk_offset) { | |
1546 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
1547 | array_size -= len; | |
1548 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
1549 | } else { | |
1550 | ptr += len; | |
1551 | cur += len; | |
1552 | } | |
1553 | } | |
1554 | return ret; | |
1555 | } | |
1556 | ||
b2950863 | 1557 | static int btrfs_relocate_chunk(struct btrfs_root *root, |
8f18cf13 CM |
1558 | u64 chunk_tree, u64 chunk_objectid, |
1559 | u64 chunk_offset) | |
1560 | { | |
1561 | struct extent_map_tree *em_tree; | |
1562 | struct btrfs_root *extent_root; | |
1563 | struct btrfs_trans_handle *trans; | |
1564 | struct extent_map *em; | |
1565 | struct map_lookup *map; | |
1566 | int ret; | |
1567 | int i; | |
1568 | ||
d397712b | 1569 | printk(KERN_INFO "btrfs relocating chunk %llu\n", |
323da79c | 1570 | (unsigned long long)chunk_offset); |
8f18cf13 CM |
1571 | root = root->fs_info->chunk_root; |
1572 | extent_root = root->fs_info->extent_root; | |
1573 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
1574 | ||
1575 | /* step one, relocate all the extents inside this chunk */ | |
1a40e23b | 1576 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); |
8f18cf13 CM |
1577 | BUG_ON(ret); |
1578 | ||
1579 | trans = btrfs_start_transaction(root, 1); | |
1580 | BUG_ON(!trans); | |
1581 | ||
7d9eb12c CM |
1582 | lock_chunks(root); |
1583 | ||
8f18cf13 CM |
1584 | /* |
1585 | * step two, delete the device extents and the | |
1586 | * chunk tree entries | |
1587 | */ | |
1588 | spin_lock(&em_tree->lock); | |
1589 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); | |
1590 | spin_unlock(&em_tree->lock); | |
1591 | ||
a061fc8d CM |
1592 | BUG_ON(em->start > chunk_offset || |
1593 | em->start + em->len < chunk_offset); | |
8f18cf13 CM |
1594 | map = (struct map_lookup *)em->bdev; |
1595 | ||
1596 | for (i = 0; i < map->num_stripes; i++) { | |
1597 | ret = btrfs_free_dev_extent(trans, map->stripes[i].dev, | |
1598 | map->stripes[i].physical); | |
1599 | BUG_ON(ret); | |
a061fc8d | 1600 | |
dfe25020 CM |
1601 | if (map->stripes[i].dev) { |
1602 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
1603 | BUG_ON(ret); | |
1604 | } | |
8f18cf13 CM |
1605 | } |
1606 | ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid, | |
1607 | chunk_offset); | |
1608 | ||
1609 | BUG_ON(ret); | |
1610 | ||
1611 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { | |
1612 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
1613 | BUG_ON(ret); | |
8f18cf13 CM |
1614 | } |
1615 | ||
2b82032c YZ |
1616 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset); |
1617 | BUG_ON(ret); | |
1618 | ||
1619 | spin_lock(&em_tree->lock); | |
1620 | remove_extent_mapping(em_tree, em); | |
1621 | spin_unlock(&em_tree->lock); | |
1622 | ||
1623 | kfree(map); | |
1624 | em->bdev = NULL; | |
1625 | ||
1626 | /* once for the tree */ | |
1627 | free_extent_map(em); | |
1628 | /* once for us */ | |
1629 | free_extent_map(em); | |
1630 | ||
1631 | unlock_chunks(root); | |
1632 | btrfs_end_transaction(trans, root); | |
1633 | return 0; | |
1634 | } | |
1635 | ||
1636 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) | |
1637 | { | |
1638 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; | |
1639 | struct btrfs_path *path; | |
1640 | struct extent_buffer *leaf; | |
1641 | struct btrfs_chunk *chunk; | |
1642 | struct btrfs_key key; | |
1643 | struct btrfs_key found_key; | |
1644 | u64 chunk_tree = chunk_root->root_key.objectid; | |
1645 | u64 chunk_type; | |
1646 | int ret; | |
1647 | ||
1648 | path = btrfs_alloc_path(); | |
1649 | if (!path) | |
1650 | return -ENOMEM; | |
1651 | ||
1652 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; | |
1653 | key.offset = (u64)-1; | |
1654 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1655 | ||
1656 | while (1) { | |
1657 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); | |
1658 | if (ret < 0) | |
1659 | goto error; | |
1660 | BUG_ON(ret == 0); | |
1661 | ||
1662 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
1663 | key.type); | |
1664 | if (ret < 0) | |
1665 | goto error; | |
1666 | if (ret > 0) | |
1667 | break; | |
1a40e23b | 1668 | |
2b82032c YZ |
1669 | leaf = path->nodes[0]; |
1670 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 1671 | |
2b82032c YZ |
1672 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
1673 | struct btrfs_chunk); | |
1674 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
1675 | btrfs_release_path(chunk_root, path); | |
8f18cf13 | 1676 | |
2b82032c YZ |
1677 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
1678 | ret = btrfs_relocate_chunk(chunk_root, chunk_tree, | |
1679 | found_key.objectid, | |
1680 | found_key.offset); | |
1681 | BUG_ON(ret); | |
1682 | } | |
8f18cf13 | 1683 | |
2b82032c YZ |
1684 | if (found_key.offset == 0) |
1685 | break; | |
1686 | key.offset = found_key.offset - 1; | |
1687 | } | |
1688 | ret = 0; | |
1689 | error: | |
1690 | btrfs_free_path(path); | |
1691 | return ret; | |
8f18cf13 CM |
1692 | } |
1693 | ||
ec44a35c CM |
1694 | static u64 div_factor(u64 num, int factor) |
1695 | { | |
1696 | if (factor == 10) | |
1697 | return num; | |
1698 | num *= factor; | |
1699 | do_div(num, 10); | |
1700 | return num; | |
1701 | } | |
1702 | ||
ec44a35c CM |
1703 | int btrfs_balance(struct btrfs_root *dev_root) |
1704 | { | |
1705 | int ret; | |
ec44a35c CM |
1706 | struct list_head *devices = &dev_root->fs_info->fs_devices->devices; |
1707 | struct btrfs_device *device; | |
1708 | u64 old_size; | |
1709 | u64 size_to_free; | |
1710 | struct btrfs_path *path; | |
1711 | struct btrfs_key key; | |
1712 | struct btrfs_chunk *chunk; | |
1713 | struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root; | |
1714 | struct btrfs_trans_handle *trans; | |
1715 | struct btrfs_key found_key; | |
1716 | ||
2b82032c YZ |
1717 | if (dev_root->fs_info->sb->s_flags & MS_RDONLY) |
1718 | return -EROFS; | |
ec44a35c | 1719 | |
7d9eb12c | 1720 | mutex_lock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
1721 | dev_root = dev_root->fs_info->dev_root; |
1722 | ||
ec44a35c | 1723 | /* step one make some room on all the devices */ |
c6e30871 | 1724 | list_for_each_entry(device, devices, dev_list) { |
ec44a35c CM |
1725 | old_size = device->total_bytes; |
1726 | size_to_free = div_factor(old_size, 1); | |
1727 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
2b82032c YZ |
1728 | if (!device->writeable || |
1729 | device->total_bytes - device->bytes_used > size_to_free) | |
ec44a35c CM |
1730 | continue; |
1731 | ||
1732 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
1733 | BUG_ON(ret); | |
1734 | ||
1735 | trans = btrfs_start_transaction(dev_root, 1); | |
1736 | BUG_ON(!trans); | |
1737 | ||
1738 | ret = btrfs_grow_device(trans, device, old_size); | |
1739 | BUG_ON(ret); | |
1740 | ||
1741 | btrfs_end_transaction(trans, dev_root); | |
1742 | } | |
1743 | ||
1744 | /* step two, relocate all the chunks */ | |
1745 | path = btrfs_alloc_path(); | |
1746 | BUG_ON(!path); | |
1747 | ||
1748 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; | |
1749 | key.offset = (u64)-1; | |
1750 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1751 | ||
d397712b | 1752 | while (1) { |
ec44a35c CM |
1753 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
1754 | if (ret < 0) | |
1755 | goto error; | |
1756 | ||
1757 | /* | |
1758 | * this shouldn't happen, it means the last relocate | |
1759 | * failed | |
1760 | */ | |
1761 | if (ret == 0) | |
1762 | break; | |
1763 | ||
1764 | ret = btrfs_previous_item(chunk_root, path, 0, | |
1765 | BTRFS_CHUNK_ITEM_KEY); | |
7d9eb12c | 1766 | if (ret) |
ec44a35c | 1767 | break; |
7d9eb12c | 1768 | |
ec44a35c CM |
1769 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
1770 | path->slots[0]); | |
1771 | if (found_key.objectid != key.objectid) | |
1772 | break; | |
7d9eb12c | 1773 | |
ec44a35c CM |
1774 | chunk = btrfs_item_ptr(path->nodes[0], |
1775 | path->slots[0], | |
1776 | struct btrfs_chunk); | |
1777 | key.offset = found_key.offset; | |
1778 | /* chunk zero is special */ | |
1779 | if (key.offset == 0) | |
1780 | break; | |
1781 | ||
7d9eb12c | 1782 | btrfs_release_path(chunk_root, path); |
ec44a35c CM |
1783 | ret = btrfs_relocate_chunk(chunk_root, |
1784 | chunk_root->root_key.objectid, | |
1785 | found_key.objectid, | |
1786 | found_key.offset); | |
1787 | BUG_ON(ret); | |
ec44a35c CM |
1788 | } |
1789 | ret = 0; | |
1790 | error: | |
1791 | btrfs_free_path(path); | |
7d9eb12c | 1792 | mutex_unlock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
1793 | return ret; |
1794 | } | |
1795 | ||
8f18cf13 CM |
1796 | /* |
1797 | * shrinking a device means finding all of the device extents past | |
1798 | * the new size, and then following the back refs to the chunks. | |
1799 | * The chunk relocation code actually frees the device extent | |
1800 | */ | |
1801 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
1802 | { | |
1803 | struct btrfs_trans_handle *trans; | |
1804 | struct btrfs_root *root = device->dev_root; | |
1805 | struct btrfs_dev_extent *dev_extent = NULL; | |
1806 | struct btrfs_path *path; | |
1807 | u64 length; | |
1808 | u64 chunk_tree; | |
1809 | u64 chunk_objectid; | |
1810 | u64 chunk_offset; | |
1811 | int ret; | |
1812 | int slot; | |
1813 | struct extent_buffer *l; | |
1814 | struct btrfs_key key; | |
1815 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
1816 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
1817 | u64 diff = device->total_bytes - new_size; | |
1818 | ||
2b82032c YZ |
1819 | if (new_size >= device->total_bytes) |
1820 | return -EINVAL; | |
8f18cf13 CM |
1821 | |
1822 | path = btrfs_alloc_path(); | |
1823 | if (!path) | |
1824 | return -ENOMEM; | |
1825 | ||
1826 | trans = btrfs_start_transaction(root, 1); | |
1827 | if (!trans) { | |
1828 | ret = -ENOMEM; | |
1829 | goto done; | |
1830 | } | |
1831 | ||
1832 | path->reada = 2; | |
1833 | ||
7d9eb12c CM |
1834 | lock_chunks(root); |
1835 | ||
8f18cf13 | 1836 | device->total_bytes = new_size; |
2b82032c YZ |
1837 | if (device->writeable) |
1838 | device->fs_devices->total_rw_bytes -= diff; | |
8f18cf13 CM |
1839 | ret = btrfs_update_device(trans, device); |
1840 | if (ret) { | |
7d9eb12c | 1841 | unlock_chunks(root); |
8f18cf13 CM |
1842 | btrfs_end_transaction(trans, root); |
1843 | goto done; | |
1844 | } | |
1845 | WARN_ON(diff > old_total); | |
1846 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
7d9eb12c | 1847 | unlock_chunks(root); |
8f18cf13 CM |
1848 | btrfs_end_transaction(trans, root); |
1849 | ||
1850 | key.objectid = device->devid; | |
1851 | key.offset = (u64)-1; | |
1852 | key.type = BTRFS_DEV_EXTENT_KEY; | |
1853 | ||
1854 | while (1) { | |
1855 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1856 | if (ret < 0) | |
1857 | goto done; | |
1858 | ||
1859 | ret = btrfs_previous_item(root, path, 0, key.type); | |
1860 | if (ret < 0) | |
1861 | goto done; | |
1862 | if (ret) { | |
1863 | ret = 0; | |
1864 | goto done; | |
1865 | } | |
1866 | ||
1867 | l = path->nodes[0]; | |
1868 | slot = path->slots[0]; | |
1869 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
1870 | ||
1871 | if (key.objectid != device->devid) | |
1872 | goto done; | |
1873 | ||
1874 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
1875 | length = btrfs_dev_extent_length(l, dev_extent); | |
1876 | ||
1877 | if (key.offset + length <= new_size) | |
1878 | goto done; | |
1879 | ||
1880 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
1881 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
1882 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
1883 | btrfs_release_path(root, path); | |
1884 | ||
1885 | ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid, | |
1886 | chunk_offset); | |
1887 | if (ret) | |
1888 | goto done; | |
1889 | } | |
1890 | ||
1891 | done: | |
1892 | btrfs_free_path(path); | |
1893 | return ret; | |
1894 | } | |
1895 | ||
b2950863 | 1896 | static int btrfs_add_system_chunk(struct btrfs_trans_handle *trans, |
0b86a832 CM |
1897 | struct btrfs_root *root, |
1898 | struct btrfs_key *key, | |
1899 | struct btrfs_chunk *chunk, int item_size) | |
1900 | { | |
1901 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
1902 | struct btrfs_disk_key disk_key; | |
1903 | u32 array_size; | |
1904 | u8 *ptr; | |
1905 | ||
1906 | array_size = btrfs_super_sys_array_size(super_copy); | |
1907 | if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) | |
1908 | return -EFBIG; | |
1909 | ||
1910 | ptr = super_copy->sys_chunk_array + array_size; | |
1911 | btrfs_cpu_key_to_disk(&disk_key, key); | |
1912 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
1913 | ptr += sizeof(disk_key); | |
1914 | memcpy(ptr, chunk, item_size); | |
1915 | item_size += sizeof(disk_key); | |
1916 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
1917 | return 0; | |
1918 | } | |
1919 | ||
d397712b | 1920 | static noinline u64 chunk_bytes_by_type(u64 type, u64 calc_size, |
a1b32a59 | 1921 | int num_stripes, int sub_stripes) |
9b3f68b9 CM |
1922 | { |
1923 | if (type & (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP)) | |
1924 | return calc_size; | |
1925 | else if (type & BTRFS_BLOCK_GROUP_RAID10) | |
1926 | return calc_size * (num_stripes / sub_stripes); | |
1927 | else | |
1928 | return calc_size * num_stripes; | |
1929 | } | |
1930 | ||
2b82032c YZ |
1931 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
1932 | struct btrfs_root *extent_root, | |
1933 | struct map_lookup **map_ret, | |
1934 | u64 *num_bytes, u64 *stripe_size, | |
1935 | u64 start, u64 type) | |
0b86a832 | 1936 | { |
593060d7 | 1937 | struct btrfs_fs_info *info = extent_root->fs_info; |
0b86a832 | 1938 | struct btrfs_device *device = NULL; |
2b82032c | 1939 | struct btrfs_fs_devices *fs_devices = info->fs_devices; |
6324fbf3 | 1940 | struct list_head *cur; |
2b82032c | 1941 | struct map_lookup *map = NULL; |
0b86a832 | 1942 | struct extent_map_tree *em_tree; |
0b86a832 | 1943 | struct extent_map *em; |
2b82032c | 1944 | struct list_head private_devs; |
a40a90a0 | 1945 | int min_stripe_size = 1 * 1024 * 1024; |
0b86a832 | 1946 | u64 calc_size = 1024 * 1024 * 1024; |
9b3f68b9 CM |
1947 | u64 max_chunk_size = calc_size; |
1948 | u64 min_free; | |
6324fbf3 CM |
1949 | u64 avail; |
1950 | u64 max_avail = 0; | |
2b82032c | 1951 | u64 dev_offset; |
6324fbf3 | 1952 | int num_stripes = 1; |
a40a90a0 | 1953 | int min_stripes = 1; |
321aecc6 | 1954 | int sub_stripes = 0; |
6324fbf3 | 1955 | int looped = 0; |
0b86a832 | 1956 | int ret; |
6324fbf3 | 1957 | int index; |
593060d7 | 1958 | int stripe_len = 64 * 1024; |
0b86a832 | 1959 | |
ec44a35c CM |
1960 | if ((type & BTRFS_BLOCK_GROUP_RAID1) && |
1961 | (type & BTRFS_BLOCK_GROUP_DUP)) { | |
1962 | WARN_ON(1); | |
1963 | type &= ~BTRFS_BLOCK_GROUP_DUP; | |
1964 | } | |
2b82032c | 1965 | if (list_empty(&fs_devices->alloc_list)) |
6324fbf3 | 1966 | return -ENOSPC; |
593060d7 | 1967 | |
a40a90a0 | 1968 | if (type & (BTRFS_BLOCK_GROUP_RAID0)) { |
2b82032c | 1969 | num_stripes = fs_devices->rw_devices; |
a40a90a0 CM |
1970 | min_stripes = 2; |
1971 | } | |
1972 | if (type & (BTRFS_BLOCK_GROUP_DUP)) { | |
611f0e00 | 1973 | num_stripes = 2; |
a40a90a0 CM |
1974 | min_stripes = 2; |
1975 | } | |
8790d502 | 1976 | if (type & (BTRFS_BLOCK_GROUP_RAID1)) { |
2b82032c | 1977 | num_stripes = min_t(u64, 2, fs_devices->rw_devices); |
9b3f68b9 CM |
1978 | if (num_stripes < 2) |
1979 | return -ENOSPC; | |
a40a90a0 | 1980 | min_stripes = 2; |
8790d502 | 1981 | } |
321aecc6 | 1982 | if (type & (BTRFS_BLOCK_GROUP_RAID10)) { |
2b82032c | 1983 | num_stripes = fs_devices->rw_devices; |
321aecc6 CM |
1984 | if (num_stripes < 4) |
1985 | return -ENOSPC; | |
1986 | num_stripes &= ~(u32)1; | |
1987 | sub_stripes = 2; | |
a40a90a0 | 1988 | min_stripes = 4; |
321aecc6 | 1989 | } |
9b3f68b9 CM |
1990 | |
1991 | if (type & BTRFS_BLOCK_GROUP_DATA) { | |
1992 | max_chunk_size = 10 * calc_size; | |
a40a90a0 | 1993 | min_stripe_size = 64 * 1024 * 1024; |
9b3f68b9 CM |
1994 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
1995 | max_chunk_size = 4 * calc_size; | |
a40a90a0 CM |
1996 | min_stripe_size = 32 * 1024 * 1024; |
1997 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { | |
1998 | calc_size = 8 * 1024 * 1024; | |
1999 | max_chunk_size = calc_size * 2; | |
2000 | min_stripe_size = 1 * 1024 * 1024; | |
9b3f68b9 CM |
2001 | } |
2002 | ||
2b82032c YZ |
2003 | /* we don't want a chunk larger than 10% of writeable space */ |
2004 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
2005 | max_chunk_size); | |
9b3f68b9 | 2006 | |
a40a90a0 | 2007 | again: |
2b82032c YZ |
2008 | if (!map || map->num_stripes != num_stripes) { |
2009 | kfree(map); | |
2010 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
2011 | if (!map) | |
2012 | return -ENOMEM; | |
2013 | map->num_stripes = num_stripes; | |
2014 | } | |
2015 | ||
9b3f68b9 CM |
2016 | if (calc_size * num_stripes > max_chunk_size) { |
2017 | calc_size = max_chunk_size; | |
2018 | do_div(calc_size, num_stripes); | |
2019 | do_div(calc_size, stripe_len); | |
2020 | calc_size *= stripe_len; | |
2021 | } | |
2022 | /* we don't want tiny stripes */ | |
a40a90a0 | 2023 | calc_size = max_t(u64, min_stripe_size, calc_size); |
9b3f68b9 | 2024 | |
9b3f68b9 CM |
2025 | do_div(calc_size, stripe_len); |
2026 | calc_size *= stripe_len; | |
2027 | ||
2b82032c | 2028 | cur = fs_devices->alloc_list.next; |
6324fbf3 | 2029 | index = 0; |
611f0e00 CM |
2030 | |
2031 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
2032 | min_free = calc_size * 2; | |
9b3f68b9 CM |
2033 | else |
2034 | min_free = calc_size; | |
611f0e00 | 2035 | |
0f9dd46c JB |
2036 | /* |
2037 | * we add 1MB because we never use the first 1MB of the device, unless | |
2038 | * we've looped, then we are likely allocating the maximum amount of | |
2039 | * space left already | |
2040 | */ | |
2041 | if (!looped) | |
2042 | min_free += 1024 * 1024; | |
ad5bd91e | 2043 | |
2b82032c | 2044 | INIT_LIST_HEAD(&private_devs); |
d397712b | 2045 | while (index < num_stripes) { |
b3075717 | 2046 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
2b82032c | 2047 | BUG_ON(!device->writeable); |
dfe25020 CM |
2048 | if (device->total_bytes > device->bytes_used) |
2049 | avail = device->total_bytes - device->bytes_used; | |
2050 | else | |
2051 | avail = 0; | |
6324fbf3 | 2052 | cur = cur->next; |
8f18cf13 | 2053 | |
dfe25020 | 2054 | if (device->in_fs_metadata && avail >= min_free) { |
2b82032c YZ |
2055 | ret = find_free_dev_extent(trans, device, |
2056 | min_free, &dev_offset); | |
8f18cf13 CM |
2057 | if (ret == 0) { |
2058 | list_move_tail(&device->dev_alloc_list, | |
2059 | &private_devs); | |
2b82032c YZ |
2060 | map->stripes[index].dev = device; |
2061 | map->stripes[index].physical = dev_offset; | |
611f0e00 | 2062 | index++; |
2b82032c YZ |
2063 | if (type & BTRFS_BLOCK_GROUP_DUP) { |
2064 | map->stripes[index].dev = device; | |
2065 | map->stripes[index].physical = | |
2066 | dev_offset + calc_size; | |
8f18cf13 | 2067 | index++; |
2b82032c | 2068 | } |
8f18cf13 | 2069 | } |
dfe25020 | 2070 | } else if (device->in_fs_metadata && avail > max_avail) |
a40a90a0 | 2071 | max_avail = avail; |
2b82032c | 2072 | if (cur == &fs_devices->alloc_list) |
6324fbf3 CM |
2073 | break; |
2074 | } | |
2b82032c | 2075 | list_splice(&private_devs, &fs_devices->alloc_list); |
6324fbf3 | 2076 | if (index < num_stripes) { |
a40a90a0 CM |
2077 | if (index >= min_stripes) { |
2078 | num_stripes = index; | |
2079 | if (type & (BTRFS_BLOCK_GROUP_RAID10)) { | |
2080 | num_stripes /= sub_stripes; | |
2081 | num_stripes *= sub_stripes; | |
2082 | } | |
2083 | looped = 1; | |
2084 | goto again; | |
2085 | } | |
6324fbf3 CM |
2086 | if (!looped && max_avail > 0) { |
2087 | looped = 1; | |
2088 | calc_size = max_avail; | |
2089 | goto again; | |
2090 | } | |
2b82032c | 2091 | kfree(map); |
6324fbf3 CM |
2092 | return -ENOSPC; |
2093 | } | |
2b82032c YZ |
2094 | map->sector_size = extent_root->sectorsize; |
2095 | map->stripe_len = stripe_len; | |
2096 | map->io_align = stripe_len; | |
2097 | map->io_width = stripe_len; | |
2098 | map->type = type; | |
2099 | map->num_stripes = num_stripes; | |
2100 | map->sub_stripes = sub_stripes; | |
0b86a832 | 2101 | |
2b82032c YZ |
2102 | *map_ret = map; |
2103 | *stripe_size = calc_size; | |
2104 | *num_bytes = chunk_bytes_by_type(type, calc_size, | |
2105 | num_stripes, sub_stripes); | |
0b86a832 | 2106 | |
2b82032c YZ |
2107 | em = alloc_extent_map(GFP_NOFS); |
2108 | if (!em) { | |
2109 | kfree(map); | |
593060d7 CM |
2110 | return -ENOMEM; |
2111 | } | |
2b82032c YZ |
2112 | em->bdev = (struct block_device *)map; |
2113 | em->start = start; | |
2114 | em->len = *num_bytes; | |
2115 | em->block_start = 0; | |
2116 | em->block_len = em->len; | |
593060d7 | 2117 | |
2b82032c YZ |
2118 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
2119 | spin_lock(&em_tree->lock); | |
2120 | ret = add_extent_mapping(em_tree, em); | |
2121 | spin_unlock(&em_tree->lock); | |
2122 | BUG_ON(ret); | |
2123 | free_extent_map(em); | |
0b86a832 | 2124 | |
2b82032c YZ |
2125 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
2126 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
2127 | start, *num_bytes); | |
2128 | BUG_ON(ret); | |
611f0e00 | 2129 | |
2b82032c YZ |
2130 | index = 0; |
2131 | while (index < map->num_stripes) { | |
2132 | device = map->stripes[index].dev; | |
2133 | dev_offset = map->stripes[index].physical; | |
0b86a832 CM |
2134 | |
2135 | ret = btrfs_alloc_dev_extent(trans, device, | |
2b82032c YZ |
2136 | info->chunk_root->root_key.objectid, |
2137 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
2138 | start, dev_offset, calc_size); | |
0b86a832 | 2139 | BUG_ON(ret); |
2b82032c YZ |
2140 | index++; |
2141 | } | |
2142 | ||
2143 | return 0; | |
2144 | } | |
2145 | ||
2146 | static int __finish_chunk_alloc(struct btrfs_trans_handle *trans, | |
2147 | struct btrfs_root *extent_root, | |
2148 | struct map_lookup *map, u64 chunk_offset, | |
2149 | u64 chunk_size, u64 stripe_size) | |
2150 | { | |
2151 | u64 dev_offset; | |
2152 | struct btrfs_key key; | |
2153 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2154 | struct btrfs_device *device; | |
2155 | struct btrfs_chunk *chunk; | |
2156 | struct btrfs_stripe *stripe; | |
2157 | size_t item_size = btrfs_chunk_item_size(map->num_stripes); | |
2158 | int index = 0; | |
2159 | int ret; | |
2160 | ||
2161 | chunk = kzalloc(item_size, GFP_NOFS); | |
2162 | if (!chunk) | |
2163 | return -ENOMEM; | |
2164 | ||
2165 | index = 0; | |
2166 | while (index < map->num_stripes) { | |
2167 | device = map->stripes[index].dev; | |
2168 | device->bytes_used += stripe_size; | |
0b86a832 CM |
2169 | ret = btrfs_update_device(trans, device); |
2170 | BUG_ON(ret); | |
2b82032c YZ |
2171 | index++; |
2172 | } | |
2173 | ||
2174 | index = 0; | |
2175 | stripe = &chunk->stripe; | |
2176 | while (index < map->num_stripes) { | |
2177 | device = map->stripes[index].dev; | |
2178 | dev_offset = map->stripes[index].physical; | |
0b86a832 | 2179 | |
e17cade2 CM |
2180 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
2181 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
2182 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 2183 | stripe++; |
0b86a832 CM |
2184 | index++; |
2185 | } | |
2186 | ||
2b82032c | 2187 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 2188 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
2189 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
2190 | btrfs_set_stack_chunk_type(chunk, map->type); | |
2191 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
2192 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
2193 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b86a832 | 2194 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
2b82032c | 2195 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 2196 | |
2b82032c YZ |
2197 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2198 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2199 | key.offset = chunk_offset; | |
0b86a832 | 2200 | |
2b82032c YZ |
2201 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
2202 | BUG_ON(ret); | |
0b86a832 | 2203 | |
2b82032c YZ |
2204 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2205 | ret = btrfs_add_system_chunk(trans, chunk_root, &key, chunk, | |
2206 | item_size); | |
8f18cf13 CM |
2207 | BUG_ON(ret); |
2208 | } | |
0b86a832 | 2209 | kfree(chunk); |
2b82032c YZ |
2210 | return 0; |
2211 | } | |
0b86a832 | 2212 | |
2b82032c YZ |
2213 | /* |
2214 | * Chunk allocation falls into two parts. The first part does works | |
2215 | * that make the new allocated chunk useable, but not do any operation | |
2216 | * that modifies the chunk tree. The second part does the works that | |
2217 | * require modifying the chunk tree. This division is important for the | |
2218 | * bootstrap process of adding storage to a seed btrfs. | |
2219 | */ | |
2220 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2221 | struct btrfs_root *extent_root, u64 type) | |
2222 | { | |
2223 | u64 chunk_offset; | |
2224 | u64 chunk_size; | |
2225 | u64 stripe_size; | |
2226 | struct map_lookup *map; | |
2227 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2228 | int ret; | |
2229 | ||
2230 | ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
2231 | &chunk_offset); | |
2232 | if (ret) | |
2233 | return ret; | |
2234 | ||
2235 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2236 | &stripe_size, chunk_offset, type); | |
2237 | if (ret) | |
2238 | return ret; | |
2239 | ||
2240 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2241 | chunk_size, stripe_size); | |
2242 | BUG_ON(ret); | |
2243 | return 0; | |
2244 | } | |
2245 | ||
d397712b | 2246 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
2b82032c YZ |
2247 | struct btrfs_root *root, |
2248 | struct btrfs_device *device) | |
2249 | { | |
2250 | u64 chunk_offset; | |
2251 | u64 sys_chunk_offset; | |
2252 | u64 chunk_size; | |
2253 | u64 sys_chunk_size; | |
2254 | u64 stripe_size; | |
2255 | u64 sys_stripe_size; | |
2256 | u64 alloc_profile; | |
2257 | struct map_lookup *map; | |
2258 | struct map_lookup *sys_map; | |
2259 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2260 | struct btrfs_root *extent_root = fs_info->extent_root; | |
2261 | int ret; | |
2262 | ||
2263 | ret = find_next_chunk(fs_info->chunk_root, | |
2264 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset); | |
2265 | BUG_ON(ret); | |
2266 | ||
2267 | alloc_profile = BTRFS_BLOCK_GROUP_METADATA | | |
2268 | (fs_info->metadata_alloc_profile & | |
2269 | fs_info->avail_metadata_alloc_bits); | |
2270 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2271 | ||
2272 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2273 | &stripe_size, chunk_offset, alloc_profile); | |
2274 | BUG_ON(ret); | |
2275 | ||
2276 | sys_chunk_offset = chunk_offset + chunk_size; | |
2277 | ||
2278 | alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM | | |
2279 | (fs_info->system_alloc_profile & | |
2280 | fs_info->avail_system_alloc_bits); | |
2281 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2282 | ||
2283 | ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map, | |
2284 | &sys_chunk_size, &sys_stripe_size, | |
2285 | sys_chunk_offset, alloc_profile); | |
2286 | BUG_ON(ret); | |
2287 | ||
2288 | ret = btrfs_add_device(trans, fs_info->chunk_root, device); | |
2289 | BUG_ON(ret); | |
2290 | ||
2291 | /* | |
2292 | * Modifying chunk tree needs allocating new blocks from both | |
2293 | * system block group and metadata block group. So we only can | |
2294 | * do operations require modifying the chunk tree after both | |
2295 | * block groups were created. | |
2296 | */ | |
2297 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2298 | chunk_size, stripe_size); | |
2299 | BUG_ON(ret); | |
2300 | ||
2301 | ret = __finish_chunk_alloc(trans, extent_root, sys_map, | |
2302 | sys_chunk_offset, sys_chunk_size, | |
2303 | sys_stripe_size); | |
b248a415 | 2304 | BUG_ON(ret); |
2b82032c YZ |
2305 | return 0; |
2306 | } | |
2307 | ||
2308 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) | |
2309 | { | |
2310 | struct extent_map *em; | |
2311 | struct map_lookup *map; | |
2312 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
2313 | int readonly = 0; | |
2314 | int i; | |
2315 | ||
2316 | spin_lock(&map_tree->map_tree.lock); | |
2317 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); | |
2318 | spin_unlock(&map_tree->map_tree.lock); | |
2319 | if (!em) | |
2320 | return 1; | |
2321 | ||
2322 | map = (struct map_lookup *)em->bdev; | |
2323 | for (i = 0; i < map->num_stripes; i++) { | |
2324 | if (!map->stripes[i].dev->writeable) { | |
2325 | readonly = 1; | |
2326 | break; | |
2327 | } | |
2328 | } | |
0b86a832 | 2329 | free_extent_map(em); |
2b82032c | 2330 | return readonly; |
0b86a832 CM |
2331 | } |
2332 | ||
2333 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
2334 | { | |
2335 | extent_map_tree_init(&tree->map_tree, GFP_NOFS); | |
2336 | } | |
2337 | ||
2338 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
2339 | { | |
2340 | struct extent_map *em; | |
2341 | ||
d397712b | 2342 | while (1) { |
0b86a832 CM |
2343 | spin_lock(&tree->map_tree.lock); |
2344 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); | |
2345 | if (em) | |
2346 | remove_extent_mapping(&tree->map_tree, em); | |
2347 | spin_unlock(&tree->map_tree.lock); | |
2348 | if (!em) | |
2349 | break; | |
2350 | kfree(em->bdev); | |
2351 | /* once for us */ | |
2352 | free_extent_map(em); | |
2353 | /* once for the tree */ | |
2354 | free_extent_map(em); | |
2355 | } | |
2356 | } | |
2357 | ||
f188591e CM |
2358 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len) |
2359 | { | |
2360 | struct extent_map *em; | |
2361 | struct map_lookup *map; | |
2362 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2363 | int ret; | |
2364 | ||
2365 | spin_lock(&em_tree->lock); | |
2366 | em = lookup_extent_mapping(em_tree, logical, len); | |
b248a415 | 2367 | spin_unlock(&em_tree->lock); |
f188591e CM |
2368 | BUG_ON(!em); |
2369 | ||
2370 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2371 | map = (struct map_lookup *)em->bdev; | |
2372 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
2373 | ret = map->num_stripes; | |
321aecc6 CM |
2374 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
2375 | ret = map->sub_stripes; | |
f188591e CM |
2376 | else |
2377 | ret = 1; | |
2378 | free_extent_map(em); | |
f188591e CM |
2379 | return ret; |
2380 | } | |
2381 | ||
dfe25020 CM |
2382 | static int find_live_mirror(struct map_lookup *map, int first, int num, |
2383 | int optimal) | |
2384 | { | |
2385 | int i; | |
2386 | if (map->stripes[optimal].dev->bdev) | |
2387 | return optimal; | |
2388 | for (i = first; i < first + num; i++) { | |
2389 | if (map->stripes[i].dev->bdev) | |
2390 | return i; | |
2391 | } | |
2392 | /* we couldn't find one that doesn't fail. Just return something | |
2393 | * and the io error handling code will clean up eventually | |
2394 | */ | |
2395 | return optimal; | |
2396 | } | |
2397 | ||
f2d8d74d CM |
2398 | static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
2399 | u64 logical, u64 *length, | |
2400 | struct btrfs_multi_bio **multi_ret, | |
2401 | int mirror_num, struct page *unplug_page) | |
0b86a832 CM |
2402 | { |
2403 | struct extent_map *em; | |
2404 | struct map_lookup *map; | |
2405 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2406 | u64 offset; | |
593060d7 CM |
2407 | u64 stripe_offset; |
2408 | u64 stripe_nr; | |
cea9e445 | 2409 | int stripes_allocated = 8; |
321aecc6 | 2410 | int stripes_required = 1; |
593060d7 | 2411 | int stripe_index; |
cea9e445 | 2412 | int i; |
f2d8d74d | 2413 | int num_stripes; |
a236aed1 | 2414 | int max_errors = 0; |
cea9e445 | 2415 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 2416 | |
d397712b | 2417 | if (multi_ret && !(rw & (1 << BIO_RW))) |
cea9e445 | 2418 | stripes_allocated = 1; |
cea9e445 CM |
2419 | again: |
2420 | if (multi_ret) { | |
2421 | multi = kzalloc(btrfs_multi_bio_size(stripes_allocated), | |
2422 | GFP_NOFS); | |
2423 | if (!multi) | |
2424 | return -ENOMEM; | |
a236aed1 CM |
2425 | |
2426 | atomic_set(&multi->error, 0); | |
cea9e445 | 2427 | } |
0b86a832 CM |
2428 | |
2429 | spin_lock(&em_tree->lock); | |
2430 | em = lookup_extent_mapping(em_tree, logical, *length); | |
b248a415 | 2431 | spin_unlock(&em_tree->lock); |
f2d8d74d CM |
2432 | |
2433 | if (!em && unplug_page) | |
2434 | return 0; | |
2435 | ||
3b951516 | 2436 | if (!em) { |
d397712b CM |
2437 | printk(KERN_CRIT "unable to find logical %llu len %llu\n", |
2438 | (unsigned long long)logical, | |
2439 | (unsigned long long)*length); | |
f2d8d74d | 2440 | BUG(); |
3b951516 | 2441 | } |
0b86a832 CM |
2442 | |
2443 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2444 | map = (struct map_lookup *)em->bdev; | |
2445 | offset = logical - em->start; | |
593060d7 | 2446 | |
f188591e CM |
2447 | if (mirror_num > map->num_stripes) |
2448 | mirror_num = 0; | |
2449 | ||
cea9e445 | 2450 | /* if our multi bio struct is too small, back off and try again */ |
321aecc6 CM |
2451 | if (rw & (1 << BIO_RW)) { |
2452 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | | |
2453 | BTRFS_BLOCK_GROUP_DUP)) { | |
2454 | stripes_required = map->num_stripes; | |
a236aed1 | 2455 | max_errors = 1; |
321aecc6 CM |
2456 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2457 | stripes_required = map->sub_stripes; | |
a236aed1 | 2458 | max_errors = 1; |
321aecc6 CM |
2459 | } |
2460 | } | |
2461 | if (multi_ret && rw == WRITE && | |
2462 | stripes_allocated < stripes_required) { | |
cea9e445 | 2463 | stripes_allocated = map->num_stripes; |
cea9e445 CM |
2464 | free_extent_map(em); |
2465 | kfree(multi); | |
2466 | goto again; | |
2467 | } | |
593060d7 CM |
2468 | stripe_nr = offset; |
2469 | /* | |
2470 | * stripe_nr counts the total number of stripes we have to stride | |
2471 | * to get to this block | |
2472 | */ | |
2473 | do_div(stripe_nr, map->stripe_len); | |
2474 | ||
2475 | stripe_offset = stripe_nr * map->stripe_len; | |
2476 | BUG_ON(offset < stripe_offset); | |
2477 | ||
2478 | /* stripe_offset is the offset of this block in its stripe*/ | |
2479 | stripe_offset = offset - stripe_offset; | |
2480 | ||
cea9e445 | 2481 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 2482 | BTRFS_BLOCK_GROUP_RAID10 | |
cea9e445 CM |
2483 | BTRFS_BLOCK_GROUP_DUP)) { |
2484 | /* we limit the length of each bio to what fits in a stripe */ | |
2485 | *length = min_t(u64, em->len - offset, | |
2486 | map->stripe_len - stripe_offset); | |
2487 | } else { | |
2488 | *length = em->len - offset; | |
2489 | } | |
f2d8d74d CM |
2490 | |
2491 | if (!multi_ret && !unplug_page) | |
cea9e445 CM |
2492 | goto out; |
2493 | ||
f2d8d74d | 2494 | num_stripes = 1; |
cea9e445 | 2495 | stripe_index = 0; |
8790d502 | 2496 | if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
f2d8d74d CM |
2497 | if (unplug_page || (rw & (1 << BIO_RW))) |
2498 | num_stripes = map->num_stripes; | |
2fff734f | 2499 | else if (mirror_num) |
f188591e | 2500 | stripe_index = mirror_num - 1; |
dfe25020 CM |
2501 | else { |
2502 | stripe_index = find_live_mirror(map, 0, | |
2503 | map->num_stripes, | |
2504 | current->pid % map->num_stripes); | |
2505 | } | |
2fff734f | 2506 | |
611f0e00 | 2507 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
cea9e445 | 2508 | if (rw & (1 << BIO_RW)) |
f2d8d74d | 2509 | num_stripes = map->num_stripes; |
f188591e CM |
2510 | else if (mirror_num) |
2511 | stripe_index = mirror_num - 1; | |
2fff734f | 2512 | |
321aecc6 CM |
2513 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2514 | int factor = map->num_stripes / map->sub_stripes; | |
321aecc6 CM |
2515 | |
2516 | stripe_index = do_div(stripe_nr, factor); | |
2517 | stripe_index *= map->sub_stripes; | |
2518 | ||
f2d8d74d CM |
2519 | if (unplug_page || (rw & (1 << BIO_RW))) |
2520 | num_stripes = map->sub_stripes; | |
321aecc6 CM |
2521 | else if (mirror_num) |
2522 | stripe_index += mirror_num - 1; | |
dfe25020 CM |
2523 | else { |
2524 | stripe_index = find_live_mirror(map, stripe_index, | |
2525 | map->sub_stripes, stripe_index + | |
2526 | current->pid % map->sub_stripes); | |
2527 | } | |
8790d502 CM |
2528 | } else { |
2529 | /* | |
2530 | * after this do_div call, stripe_nr is the number of stripes | |
2531 | * on this device we have to walk to find the data, and | |
2532 | * stripe_index is the number of our device in the stripe array | |
2533 | */ | |
2534 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
2535 | } | |
593060d7 | 2536 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 2537 | |
f2d8d74d CM |
2538 | for (i = 0; i < num_stripes; i++) { |
2539 | if (unplug_page) { | |
2540 | struct btrfs_device *device; | |
2541 | struct backing_dev_info *bdi; | |
2542 | ||
2543 | device = map->stripes[stripe_index].dev; | |
dfe25020 CM |
2544 | if (device->bdev) { |
2545 | bdi = blk_get_backing_dev_info(device->bdev); | |
d397712b | 2546 | if (bdi->unplug_io_fn) |
dfe25020 | 2547 | bdi->unplug_io_fn(bdi, unplug_page); |
f2d8d74d CM |
2548 | } |
2549 | } else { | |
2550 | multi->stripes[i].physical = | |
2551 | map->stripes[stripe_index].physical + | |
2552 | stripe_offset + stripe_nr * map->stripe_len; | |
2553 | multi->stripes[i].dev = map->stripes[stripe_index].dev; | |
2554 | } | |
cea9e445 | 2555 | stripe_index++; |
593060d7 | 2556 | } |
f2d8d74d CM |
2557 | if (multi_ret) { |
2558 | *multi_ret = multi; | |
2559 | multi->num_stripes = num_stripes; | |
a236aed1 | 2560 | multi->max_errors = max_errors; |
f2d8d74d | 2561 | } |
cea9e445 | 2562 | out: |
0b86a832 | 2563 | free_extent_map(em); |
0b86a832 CM |
2564 | return 0; |
2565 | } | |
2566 | ||
f2d8d74d CM |
2567 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
2568 | u64 logical, u64 *length, | |
2569 | struct btrfs_multi_bio **multi_ret, int mirror_num) | |
2570 | { | |
2571 | return __btrfs_map_block(map_tree, rw, logical, length, multi_ret, | |
2572 | mirror_num, NULL); | |
2573 | } | |
2574 | ||
a512bbf8 YZ |
2575 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
2576 | u64 chunk_start, u64 physical, u64 devid, | |
2577 | u64 **logical, int *naddrs, int *stripe_len) | |
2578 | { | |
2579 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2580 | struct extent_map *em; | |
2581 | struct map_lookup *map; | |
2582 | u64 *buf; | |
2583 | u64 bytenr; | |
2584 | u64 length; | |
2585 | u64 stripe_nr; | |
2586 | int i, j, nr = 0; | |
2587 | ||
2588 | spin_lock(&em_tree->lock); | |
2589 | em = lookup_extent_mapping(em_tree, chunk_start, 1); | |
2590 | spin_unlock(&em_tree->lock); | |
2591 | ||
2592 | BUG_ON(!em || em->start != chunk_start); | |
2593 | map = (struct map_lookup *)em->bdev; | |
2594 | ||
2595 | length = em->len; | |
2596 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) | |
2597 | do_div(length, map->num_stripes / map->sub_stripes); | |
2598 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
2599 | do_div(length, map->num_stripes); | |
2600 | ||
2601 | buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); | |
2602 | BUG_ON(!buf); | |
2603 | ||
2604 | for (i = 0; i < map->num_stripes; i++) { | |
2605 | if (devid && map->stripes[i].dev->devid != devid) | |
2606 | continue; | |
2607 | if (map->stripes[i].physical > physical || | |
2608 | map->stripes[i].physical + length <= physical) | |
2609 | continue; | |
2610 | ||
2611 | stripe_nr = physical - map->stripes[i].physical; | |
2612 | do_div(stripe_nr, map->stripe_len); | |
2613 | ||
2614 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
2615 | stripe_nr = stripe_nr * map->num_stripes + i; | |
2616 | do_div(stripe_nr, map->sub_stripes); | |
2617 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
2618 | stripe_nr = stripe_nr * map->num_stripes + i; | |
2619 | } | |
2620 | bytenr = chunk_start + stripe_nr * map->stripe_len; | |
934d375b | 2621 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
2622 | for (j = 0; j < nr; j++) { |
2623 | if (buf[j] == bytenr) | |
2624 | break; | |
2625 | } | |
934d375b CM |
2626 | if (j == nr) { |
2627 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 2628 | buf[nr++] = bytenr; |
934d375b | 2629 | } |
a512bbf8 YZ |
2630 | } |
2631 | ||
2632 | for (i = 0; i > nr; i++) { | |
2633 | struct btrfs_multi_bio *multi; | |
2634 | struct btrfs_bio_stripe *stripe; | |
2635 | int ret; | |
2636 | ||
2637 | length = 1; | |
2638 | ret = btrfs_map_block(map_tree, WRITE, buf[i], | |
2639 | &length, &multi, 0); | |
2640 | BUG_ON(ret); | |
2641 | ||
2642 | stripe = multi->stripes; | |
2643 | for (j = 0; j < multi->num_stripes; j++) { | |
2644 | if (stripe->physical >= physical && | |
2645 | physical < stripe->physical + length) | |
2646 | break; | |
2647 | } | |
2648 | BUG_ON(j >= multi->num_stripes); | |
2649 | kfree(multi); | |
2650 | } | |
2651 | ||
2652 | *logical = buf; | |
2653 | *naddrs = nr; | |
2654 | *stripe_len = map->stripe_len; | |
2655 | ||
2656 | free_extent_map(em); | |
2657 | return 0; | |
2658 | } | |
2659 | ||
f2d8d74d CM |
2660 | int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, |
2661 | u64 logical, struct page *page) | |
2662 | { | |
2663 | u64 length = PAGE_CACHE_SIZE; | |
2664 | return __btrfs_map_block(map_tree, READ, logical, &length, | |
2665 | NULL, 0, page); | |
2666 | } | |
2667 | ||
8790d502 | 2668 | static void end_bio_multi_stripe(struct bio *bio, int err) |
8790d502 | 2669 | { |
cea9e445 | 2670 | struct btrfs_multi_bio *multi = bio->bi_private; |
7d2b4daa | 2671 | int is_orig_bio = 0; |
8790d502 | 2672 | |
8790d502 | 2673 | if (err) |
a236aed1 | 2674 | atomic_inc(&multi->error); |
8790d502 | 2675 | |
7d2b4daa CM |
2676 | if (bio == multi->orig_bio) |
2677 | is_orig_bio = 1; | |
2678 | ||
cea9e445 | 2679 | if (atomic_dec_and_test(&multi->stripes_pending)) { |
7d2b4daa CM |
2680 | if (!is_orig_bio) { |
2681 | bio_put(bio); | |
2682 | bio = multi->orig_bio; | |
2683 | } | |
8790d502 CM |
2684 | bio->bi_private = multi->private; |
2685 | bio->bi_end_io = multi->end_io; | |
a236aed1 CM |
2686 | /* only send an error to the higher layers if it is |
2687 | * beyond the tolerance of the multi-bio | |
2688 | */ | |
1259ab75 | 2689 | if (atomic_read(&multi->error) > multi->max_errors) { |
a236aed1 | 2690 | err = -EIO; |
1259ab75 CM |
2691 | } else if (err) { |
2692 | /* | |
2693 | * this bio is actually up to date, we didn't | |
2694 | * go over the max number of errors | |
2695 | */ | |
2696 | set_bit(BIO_UPTODATE, &bio->bi_flags); | |
a236aed1 | 2697 | err = 0; |
1259ab75 | 2698 | } |
8790d502 CM |
2699 | kfree(multi); |
2700 | ||
2701 | bio_endio(bio, err); | |
7d2b4daa | 2702 | } else if (!is_orig_bio) { |
8790d502 CM |
2703 | bio_put(bio); |
2704 | } | |
8790d502 CM |
2705 | } |
2706 | ||
8b712842 CM |
2707 | struct async_sched { |
2708 | struct bio *bio; | |
2709 | int rw; | |
2710 | struct btrfs_fs_info *info; | |
2711 | struct btrfs_work work; | |
2712 | }; | |
2713 | ||
2714 | /* | |
2715 | * see run_scheduled_bios for a description of why bios are collected for | |
2716 | * async submit. | |
2717 | * | |
2718 | * This will add one bio to the pending list for a device and make sure | |
2719 | * the work struct is scheduled. | |
2720 | */ | |
d397712b | 2721 | static noinline int schedule_bio(struct btrfs_root *root, |
a1b32a59 CM |
2722 | struct btrfs_device *device, |
2723 | int rw, struct bio *bio) | |
8b712842 CM |
2724 | { |
2725 | int should_queue = 1; | |
2726 | ||
2727 | /* don't bother with additional async steps for reads, right now */ | |
2728 | if (!(rw & (1 << BIO_RW))) { | |
492bb6de | 2729 | bio_get(bio); |
8b712842 | 2730 | submit_bio(rw, bio); |
492bb6de | 2731 | bio_put(bio); |
8b712842 CM |
2732 | return 0; |
2733 | } | |
2734 | ||
2735 | /* | |
0986fe9e | 2736 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
2737 | * higher layers. Otherwise, the async bio makes it appear we have |
2738 | * made progress against dirty pages when we've really just put it | |
2739 | * on a queue for later | |
2740 | */ | |
0986fe9e | 2741 | atomic_inc(&root->fs_info->nr_async_bios); |
492bb6de | 2742 | WARN_ON(bio->bi_next); |
8b712842 CM |
2743 | bio->bi_next = NULL; |
2744 | bio->bi_rw |= rw; | |
2745 | ||
2746 | spin_lock(&device->io_lock); | |
2747 | ||
2748 | if (device->pending_bio_tail) | |
2749 | device->pending_bio_tail->bi_next = bio; | |
2750 | ||
2751 | device->pending_bio_tail = bio; | |
2752 | if (!device->pending_bios) | |
2753 | device->pending_bios = bio; | |
2754 | if (device->running_pending) | |
2755 | should_queue = 0; | |
2756 | ||
2757 | spin_unlock(&device->io_lock); | |
2758 | ||
2759 | if (should_queue) | |
1cc127b5 CM |
2760 | btrfs_queue_worker(&root->fs_info->submit_workers, |
2761 | &device->work); | |
8b712842 CM |
2762 | return 0; |
2763 | } | |
2764 | ||
f188591e | 2765 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 2766 | int mirror_num, int async_submit) |
0b86a832 CM |
2767 | { |
2768 | struct btrfs_mapping_tree *map_tree; | |
2769 | struct btrfs_device *dev; | |
8790d502 | 2770 | struct bio *first_bio = bio; |
a62b9401 | 2771 | u64 logical = (u64)bio->bi_sector << 9; |
0b86a832 CM |
2772 | u64 length = 0; |
2773 | u64 map_length; | |
cea9e445 | 2774 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 2775 | int ret; |
8790d502 CM |
2776 | int dev_nr = 0; |
2777 | int total_devs = 1; | |
0b86a832 | 2778 | |
f2d8d74d | 2779 | length = bio->bi_size; |
0b86a832 CM |
2780 | map_tree = &root->fs_info->mapping_tree; |
2781 | map_length = length; | |
cea9e445 | 2782 | |
f188591e CM |
2783 | ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi, |
2784 | mirror_num); | |
cea9e445 CM |
2785 | BUG_ON(ret); |
2786 | ||
2787 | total_devs = multi->num_stripes; | |
2788 | if (map_length < length) { | |
d397712b CM |
2789 | printk(KERN_CRIT "mapping failed logical %llu bio len %llu " |
2790 | "len %llu\n", (unsigned long long)logical, | |
2791 | (unsigned long long)length, | |
2792 | (unsigned long long)map_length); | |
cea9e445 CM |
2793 | BUG(); |
2794 | } | |
2795 | multi->end_io = first_bio->bi_end_io; | |
2796 | multi->private = first_bio->bi_private; | |
7d2b4daa | 2797 | multi->orig_bio = first_bio; |
cea9e445 CM |
2798 | atomic_set(&multi->stripes_pending, multi->num_stripes); |
2799 | ||
d397712b | 2800 | while (dev_nr < total_devs) { |
8790d502 | 2801 | if (total_devs > 1) { |
8790d502 CM |
2802 | if (dev_nr < total_devs - 1) { |
2803 | bio = bio_clone(first_bio, GFP_NOFS); | |
2804 | BUG_ON(!bio); | |
2805 | } else { | |
2806 | bio = first_bio; | |
2807 | } | |
2808 | bio->bi_private = multi; | |
2809 | bio->bi_end_io = end_bio_multi_stripe; | |
2810 | } | |
cea9e445 CM |
2811 | bio->bi_sector = multi->stripes[dev_nr].physical >> 9; |
2812 | dev = multi->stripes[dev_nr].dev; | |
2b82032c | 2813 | BUG_ON(rw == WRITE && !dev->writeable); |
dfe25020 CM |
2814 | if (dev && dev->bdev) { |
2815 | bio->bi_bdev = dev->bdev; | |
8b712842 CM |
2816 | if (async_submit) |
2817 | schedule_bio(root, dev, rw, bio); | |
2818 | else | |
2819 | submit_bio(rw, bio); | |
dfe25020 CM |
2820 | } else { |
2821 | bio->bi_bdev = root->fs_info->fs_devices->latest_bdev; | |
2822 | bio->bi_sector = logical >> 9; | |
dfe25020 | 2823 | bio_endio(bio, -EIO); |
dfe25020 | 2824 | } |
8790d502 CM |
2825 | dev_nr++; |
2826 | } | |
cea9e445 CM |
2827 | if (total_devs == 1) |
2828 | kfree(multi); | |
0b86a832 CM |
2829 | return 0; |
2830 | } | |
2831 | ||
a443755f | 2832 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, |
2b82032c | 2833 | u8 *uuid, u8 *fsid) |
0b86a832 | 2834 | { |
2b82032c YZ |
2835 | struct btrfs_device *device; |
2836 | struct btrfs_fs_devices *cur_devices; | |
2837 | ||
2838 | cur_devices = root->fs_info->fs_devices; | |
2839 | while (cur_devices) { | |
2840 | if (!fsid || | |
2841 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
2842 | device = __find_device(&cur_devices->devices, | |
2843 | devid, uuid); | |
2844 | if (device) | |
2845 | return device; | |
2846 | } | |
2847 | cur_devices = cur_devices->seed; | |
2848 | } | |
2849 | return NULL; | |
0b86a832 CM |
2850 | } |
2851 | ||
dfe25020 CM |
2852 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
2853 | u64 devid, u8 *dev_uuid) | |
2854 | { | |
2855 | struct btrfs_device *device; | |
2856 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2857 | ||
2858 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
7cbd8a83 | 2859 | if (!device) |
2860 | return NULL; | |
dfe25020 CM |
2861 | list_add(&device->dev_list, |
2862 | &fs_devices->devices); | |
dfe25020 CM |
2863 | device->barriers = 1; |
2864 | device->dev_root = root->fs_info->dev_root; | |
2865 | device->devid = devid; | |
8b712842 | 2866 | device->work.func = pending_bios_fn; |
e4404d6e | 2867 | device->fs_devices = fs_devices; |
dfe25020 CM |
2868 | fs_devices->num_devices++; |
2869 | spin_lock_init(&device->io_lock); | |
d20f7043 | 2870 | INIT_LIST_HEAD(&device->dev_alloc_list); |
dfe25020 CM |
2871 | memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE); |
2872 | return device; | |
2873 | } | |
2874 | ||
0b86a832 CM |
2875 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
2876 | struct extent_buffer *leaf, | |
2877 | struct btrfs_chunk *chunk) | |
2878 | { | |
2879 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
2880 | struct map_lookup *map; | |
2881 | struct extent_map *em; | |
2882 | u64 logical; | |
2883 | u64 length; | |
2884 | u64 devid; | |
a443755f | 2885 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 2886 | int num_stripes; |
0b86a832 | 2887 | int ret; |
593060d7 | 2888 | int i; |
0b86a832 | 2889 | |
e17cade2 CM |
2890 | logical = key->offset; |
2891 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 2892 | |
0b86a832 CM |
2893 | spin_lock(&map_tree->map_tree.lock); |
2894 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); | |
b248a415 | 2895 | spin_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
2896 | |
2897 | /* already mapped? */ | |
2898 | if (em && em->start <= logical && em->start + em->len > logical) { | |
2899 | free_extent_map(em); | |
0b86a832 CM |
2900 | return 0; |
2901 | } else if (em) { | |
2902 | free_extent_map(em); | |
2903 | } | |
0b86a832 | 2904 | |
0b86a832 CM |
2905 | em = alloc_extent_map(GFP_NOFS); |
2906 | if (!em) | |
2907 | return -ENOMEM; | |
593060d7 CM |
2908 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
2909 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
2910 | if (!map) { |
2911 | free_extent_map(em); | |
2912 | return -ENOMEM; | |
2913 | } | |
2914 | ||
2915 | em->bdev = (struct block_device *)map; | |
2916 | em->start = logical; | |
2917 | em->len = length; | |
2918 | em->block_start = 0; | |
c8b97818 | 2919 | em->block_len = em->len; |
0b86a832 | 2920 | |
593060d7 CM |
2921 | map->num_stripes = num_stripes; |
2922 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
2923 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
2924 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
2925 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
2926 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 2927 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
2928 | for (i = 0; i < num_stripes; i++) { |
2929 | map->stripes[i].physical = | |
2930 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
2931 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
2932 | read_extent_buffer(leaf, uuid, (unsigned long) |
2933 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
2934 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
2935 | map->stripes[i].dev = btrfs_find_device(root, devid, uuid, |
2936 | NULL); | |
dfe25020 | 2937 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
593060d7 CM |
2938 | kfree(map); |
2939 | free_extent_map(em); | |
2940 | return -EIO; | |
2941 | } | |
dfe25020 CM |
2942 | if (!map->stripes[i].dev) { |
2943 | map->stripes[i].dev = | |
2944 | add_missing_dev(root, devid, uuid); | |
2945 | if (!map->stripes[i].dev) { | |
2946 | kfree(map); | |
2947 | free_extent_map(em); | |
2948 | return -EIO; | |
2949 | } | |
2950 | } | |
2951 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
2952 | } |
2953 | ||
2954 | spin_lock(&map_tree->map_tree.lock); | |
2955 | ret = add_extent_mapping(&map_tree->map_tree, em); | |
0b86a832 | 2956 | spin_unlock(&map_tree->map_tree.lock); |
b248a415 | 2957 | BUG_ON(ret); |
0b86a832 CM |
2958 | free_extent_map(em); |
2959 | ||
2960 | return 0; | |
2961 | } | |
2962 | ||
2963 | static int fill_device_from_item(struct extent_buffer *leaf, | |
2964 | struct btrfs_dev_item *dev_item, | |
2965 | struct btrfs_device *device) | |
2966 | { | |
2967 | unsigned long ptr; | |
0b86a832 CM |
2968 | |
2969 | device->devid = btrfs_device_id(leaf, dev_item); | |
2970 | device->total_bytes = btrfs_device_total_bytes(leaf, dev_item); | |
2971 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); | |
2972 | device->type = btrfs_device_type(leaf, dev_item); | |
2973 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
2974 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
2975 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
0b86a832 CM |
2976 | |
2977 | ptr = (unsigned long)btrfs_device_uuid(dev_item); | |
e17cade2 | 2978 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 2979 | |
0b86a832 CM |
2980 | return 0; |
2981 | } | |
2982 | ||
2b82032c YZ |
2983 | static int open_seed_devices(struct btrfs_root *root, u8 *fsid) |
2984 | { | |
2985 | struct btrfs_fs_devices *fs_devices; | |
2986 | int ret; | |
2987 | ||
2988 | mutex_lock(&uuid_mutex); | |
2989 | ||
2990 | fs_devices = root->fs_info->fs_devices->seed; | |
2991 | while (fs_devices) { | |
2992 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
2993 | ret = 0; | |
2994 | goto out; | |
2995 | } | |
2996 | fs_devices = fs_devices->seed; | |
2997 | } | |
2998 | ||
2999 | fs_devices = find_fsid(fsid); | |
3000 | if (!fs_devices) { | |
3001 | ret = -ENOENT; | |
3002 | goto out; | |
3003 | } | |
e4404d6e YZ |
3004 | |
3005 | fs_devices = clone_fs_devices(fs_devices); | |
3006 | if (IS_ERR(fs_devices)) { | |
3007 | ret = PTR_ERR(fs_devices); | |
2b82032c YZ |
3008 | goto out; |
3009 | } | |
3010 | ||
97288f2c | 3011 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
15916de8 | 3012 | root->fs_info->bdev_holder); |
2b82032c YZ |
3013 | if (ret) |
3014 | goto out; | |
3015 | ||
3016 | if (!fs_devices->seeding) { | |
3017 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 3018 | free_fs_devices(fs_devices); |
2b82032c YZ |
3019 | ret = -EINVAL; |
3020 | goto out; | |
3021 | } | |
3022 | ||
3023 | fs_devices->seed = root->fs_info->fs_devices->seed; | |
3024 | root->fs_info->fs_devices->seed = fs_devices; | |
2b82032c YZ |
3025 | out: |
3026 | mutex_unlock(&uuid_mutex); | |
3027 | return ret; | |
3028 | } | |
3029 | ||
0d81ba5d | 3030 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
3031 | struct extent_buffer *leaf, |
3032 | struct btrfs_dev_item *dev_item) | |
3033 | { | |
3034 | struct btrfs_device *device; | |
3035 | u64 devid; | |
3036 | int ret; | |
2b82032c | 3037 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
3038 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
3039 | ||
0b86a832 | 3040 | devid = btrfs_device_id(leaf, dev_item); |
a443755f CM |
3041 | read_extent_buffer(leaf, dev_uuid, |
3042 | (unsigned long)btrfs_device_uuid(dev_item), | |
3043 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
3044 | read_extent_buffer(leaf, fs_uuid, |
3045 | (unsigned long)btrfs_device_fsid(dev_item), | |
3046 | BTRFS_UUID_SIZE); | |
3047 | ||
3048 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { | |
3049 | ret = open_seed_devices(root, fs_uuid); | |
e4404d6e | 3050 | if (ret && !btrfs_test_opt(root, DEGRADED)) |
2b82032c | 3051 | return ret; |
2b82032c YZ |
3052 | } |
3053 | ||
3054 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
3055 | if (!device || !device->bdev) { | |
e4404d6e | 3056 | if (!btrfs_test_opt(root, DEGRADED)) |
2b82032c YZ |
3057 | return -EIO; |
3058 | ||
3059 | if (!device) { | |
d397712b CM |
3060 | printk(KERN_WARNING "warning devid %llu missing\n", |
3061 | (unsigned long long)devid); | |
2b82032c YZ |
3062 | device = add_missing_dev(root, devid, dev_uuid); |
3063 | if (!device) | |
3064 | return -ENOMEM; | |
3065 | } | |
3066 | } | |
3067 | ||
3068 | if (device->fs_devices != root->fs_info->fs_devices) { | |
3069 | BUG_ON(device->writeable); | |
3070 | if (device->generation != | |
3071 | btrfs_device_generation(leaf, dev_item)) | |
3072 | return -EINVAL; | |
6324fbf3 | 3073 | } |
0b86a832 CM |
3074 | |
3075 | fill_device_from_item(leaf, dev_item, device); | |
3076 | device->dev_root = root->fs_info->dev_root; | |
dfe25020 | 3077 | device->in_fs_metadata = 1; |
2b82032c YZ |
3078 | if (device->writeable) |
3079 | device->fs_devices->total_rw_bytes += device->total_bytes; | |
0b86a832 | 3080 | ret = 0; |
0b86a832 CM |
3081 | return ret; |
3082 | } | |
3083 | ||
0d81ba5d CM |
3084 | int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf) |
3085 | { | |
3086 | struct btrfs_dev_item *dev_item; | |
3087 | ||
3088 | dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block, | |
3089 | dev_item); | |
3090 | return read_one_dev(root, buf, dev_item); | |
3091 | } | |
3092 | ||
e4404d6e | 3093 | int btrfs_read_sys_array(struct btrfs_root *root) |
0b86a832 CM |
3094 | { |
3095 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
a061fc8d | 3096 | struct extent_buffer *sb; |
0b86a832 | 3097 | struct btrfs_disk_key *disk_key; |
0b86a832 | 3098 | struct btrfs_chunk *chunk; |
84eed90f CM |
3099 | u8 *ptr; |
3100 | unsigned long sb_ptr; | |
3101 | int ret = 0; | |
0b86a832 CM |
3102 | u32 num_stripes; |
3103 | u32 array_size; | |
3104 | u32 len = 0; | |
0b86a832 | 3105 | u32 cur; |
84eed90f | 3106 | struct btrfs_key key; |
0b86a832 | 3107 | |
e4404d6e | 3108 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET, |
a061fc8d CM |
3109 | BTRFS_SUPER_INFO_SIZE); |
3110 | if (!sb) | |
3111 | return -ENOMEM; | |
3112 | btrfs_set_buffer_uptodate(sb); | |
4008c04a CM |
3113 | btrfs_set_buffer_lockdep_class(sb, 0); |
3114 | ||
a061fc8d | 3115 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
3116 | array_size = btrfs_super_sys_array_size(super_copy); |
3117 | ||
0b86a832 CM |
3118 | ptr = super_copy->sys_chunk_array; |
3119 | sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array); | |
3120 | cur = 0; | |
3121 | ||
3122 | while (cur < array_size) { | |
3123 | disk_key = (struct btrfs_disk_key *)ptr; | |
3124 | btrfs_disk_key_to_cpu(&key, disk_key); | |
3125 | ||
a061fc8d | 3126 | len = sizeof(*disk_key); ptr += len; |
0b86a832 CM |
3127 | sb_ptr += len; |
3128 | cur += len; | |
3129 | ||
0d81ba5d | 3130 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
0b86a832 | 3131 | chunk = (struct btrfs_chunk *)sb_ptr; |
0d81ba5d | 3132 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
3133 | if (ret) |
3134 | break; | |
0b86a832 CM |
3135 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); |
3136 | len = btrfs_chunk_item_size(num_stripes); | |
3137 | } else { | |
84eed90f CM |
3138 | ret = -EIO; |
3139 | break; | |
0b86a832 CM |
3140 | } |
3141 | ptr += len; | |
3142 | sb_ptr += len; | |
3143 | cur += len; | |
3144 | } | |
a061fc8d | 3145 | free_extent_buffer(sb); |
84eed90f | 3146 | return ret; |
0b86a832 CM |
3147 | } |
3148 | ||
3149 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
3150 | { | |
3151 | struct btrfs_path *path; | |
3152 | struct extent_buffer *leaf; | |
3153 | struct btrfs_key key; | |
3154 | struct btrfs_key found_key; | |
3155 | int ret; | |
3156 | int slot; | |
3157 | ||
3158 | root = root->fs_info->chunk_root; | |
3159 | ||
3160 | path = btrfs_alloc_path(); | |
3161 | if (!path) | |
3162 | return -ENOMEM; | |
3163 | ||
3164 | /* first we search for all of the device items, and then we | |
3165 | * read in all of the chunk items. This way we can create chunk | |
3166 | * mappings that reference all of the devices that are afound | |
3167 | */ | |
3168 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
3169 | key.offset = 0; | |
3170 | key.type = 0; | |
3171 | again: | |
3172 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
d397712b | 3173 | while (1) { |
0b86a832 CM |
3174 | leaf = path->nodes[0]; |
3175 | slot = path->slots[0]; | |
3176 | if (slot >= btrfs_header_nritems(leaf)) { | |
3177 | ret = btrfs_next_leaf(root, path); | |
3178 | if (ret == 0) | |
3179 | continue; | |
3180 | if (ret < 0) | |
3181 | goto error; | |
3182 | break; | |
3183 | } | |
3184 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
3185 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3186 | if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID) | |
3187 | break; | |
3188 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { | |
3189 | struct btrfs_dev_item *dev_item; | |
3190 | dev_item = btrfs_item_ptr(leaf, slot, | |
3191 | struct btrfs_dev_item); | |
0d81ba5d | 3192 | ret = read_one_dev(root, leaf, dev_item); |
2b82032c YZ |
3193 | if (ret) |
3194 | goto error; | |
0b86a832 CM |
3195 | } |
3196 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { | |
3197 | struct btrfs_chunk *chunk; | |
3198 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
3199 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2b82032c YZ |
3200 | if (ret) |
3201 | goto error; | |
0b86a832 CM |
3202 | } |
3203 | path->slots[0]++; | |
3204 | } | |
3205 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3206 | key.objectid = 0; | |
3207 | btrfs_release_path(root, path); | |
3208 | goto again; | |
3209 | } | |
0b86a832 CM |
3210 | ret = 0; |
3211 | error: | |
2b82032c | 3212 | btrfs_free_path(path); |
0b86a832 CM |
3213 | return ret; |
3214 | } |