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0b86a832 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | #include <linux/sched.h> | |
19 | #include <linux/bio.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
8a4b83cc | 21 | #include <linux/buffer_head.h> |
f2d8d74d | 22 | #include <linux/blkdev.h> |
788f20eb | 23 | #include <linux/random.h> |
b765ead5 | 24 | #include <linux/iocontext.h> |
6f88a440 | 25 | #include <linux/capability.h> |
593060d7 | 26 | #include <asm/div64.h> |
4b4e25f2 | 27 | #include "compat.h" |
0b86a832 CM |
28 | #include "ctree.h" |
29 | #include "extent_map.h" | |
30 | #include "disk-io.h" | |
31 | #include "transaction.h" | |
32 | #include "print-tree.h" | |
33 | #include "volumes.h" | |
8b712842 | 34 | #include "async-thread.h" |
0b86a832 | 35 | |
2b82032c YZ |
36 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
37 | struct btrfs_root *root, | |
38 | struct btrfs_device *device); | |
39 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); | |
40 | ||
8a4b83cc CM |
41 | static DEFINE_MUTEX(uuid_mutex); |
42 | static LIST_HEAD(fs_uuids); | |
43 | ||
7d9eb12c CM |
44 | static void lock_chunks(struct btrfs_root *root) |
45 | { | |
7d9eb12c CM |
46 | mutex_lock(&root->fs_info->chunk_mutex); |
47 | } | |
48 | ||
49 | static void unlock_chunks(struct btrfs_root *root) | |
50 | { | |
7d9eb12c CM |
51 | mutex_unlock(&root->fs_info->chunk_mutex); |
52 | } | |
53 | ||
e4404d6e YZ |
54 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
55 | { | |
56 | struct btrfs_device *device; | |
57 | WARN_ON(fs_devices->opened); | |
58 | while (!list_empty(&fs_devices->devices)) { | |
59 | device = list_entry(fs_devices->devices.next, | |
60 | struct btrfs_device, dev_list); | |
61 | list_del(&device->dev_list); | |
62 | kfree(device->name); | |
63 | kfree(device); | |
64 | } | |
65 | kfree(fs_devices); | |
66 | } | |
67 | ||
8a4b83cc CM |
68 | int btrfs_cleanup_fs_uuids(void) |
69 | { | |
70 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 71 | |
2b82032c YZ |
72 | while (!list_empty(&fs_uuids)) { |
73 | fs_devices = list_entry(fs_uuids.next, | |
74 | struct btrfs_fs_devices, list); | |
75 | list_del(&fs_devices->list); | |
e4404d6e | 76 | free_fs_devices(fs_devices); |
8a4b83cc CM |
77 | } |
78 | return 0; | |
79 | } | |
80 | ||
a1b32a59 CM |
81 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
82 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
83 | { |
84 | struct btrfs_device *dev; | |
8a4b83cc | 85 | |
c6e30871 | 86 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 87 | if (dev->devid == devid && |
8f18cf13 | 88 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 89 | return dev; |
a443755f | 90 | } |
8a4b83cc CM |
91 | } |
92 | return NULL; | |
93 | } | |
94 | ||
a1b32a59 | 95 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 96 | { |
8a4b83cc CM |
97 | struct btrfs_fs_devices *fs_devices; |
98 | ||
c6e30871 | 99 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
100 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
101 | return fs_devices; | |
102 | } | |
103 | return NULL; | |
104 | } | |
105 | ||
ffbd517d CM |
106 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
107 | struct bio *head, struct bio *tail) | |
108 | { | |
109 | ||
110 | struct bio *old_head; | |
111 | ||
112 | old_head = pending_bios->head; | |
113 | pending_bios->head = head; | |
114 | if (pending_bios->tail) | |
115 | tail->bi_next = old_head; | |
116 | else | |
117 | pending_bios->tail = tail; | |
118 | } | |
119 | ||
8b712842 CM |
120 | /* |
121 | * we try to collect pending bios for a device so we don't get a large | |
122 | * number of procs sending bios down to the same device. This greatly | |
123 | * improves the schedulers ability to collect and merge the bios. | |
124 | * | |
125 | * But, it also turns into a long list of bios to process and that is sure | |
126 | * to eventually make the worker thread block. The solution here is to | |
127 | * make some progress and then put this work struct back at the end of | |
128 | * the list if the block device is congested. This way, multiple devices | |
129 | * can make progress from a single worker thread. | |
130 | */ | |
d397712b | 131 | static noinline int run_scheduled_bios(struct btrfs_device *device) |
8b712842 CM |
132 | { |
133 | struct bio *pending; | |
134 | struct backing_dev_info *bdi; | |
b64a2851 | 135 | struct btrfs_fs_info *fs_info; |
ffbd517d | 136 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
137 | struct bio *tail; |
138 | struct bio *cur; | |
139 | int again = 0; | |
ffbd517d | 140 | unsigned long num_run; |
d644d8a1 | 141 | unsigned long batch_run = 0; |
b64a2851 | 142 | unsigned long limit; |
b765ead5 | 143 | unsigned long last_waited = 0; |
d84275c9 | 144 | int force_reg = 0; |
2ab1ba68 | 145 | int sync_pending; |
211588ad CM |
146 | struct blk_plug plug; |
147 | ||
148 | /* | |
149 | * this function runs all the bios we've collected for | |
150 | * a particular device. We don't want to wander off to | |
151 | * another device without first sending all of these down. | |
152 | * So, setup a plug here and finish it off before we return | |
153 | */ | |
154 | blk_start_plug(&plug); | |
8b712842 | 155 | |
bedf762b | 156 | bdi = blk_get_backing_dev_info(device->bdev); |
b64a2851 CM |
157 | fs_info = device->dev_root->fs_info; |
158 | limit = btrfs_async_submit_limit(fs_info); | |
159 | limit = limit * 2 / 3; | |
160 | ||
8b712842 CM |
161 | loop: |
162 | spin_lock(&device->io_lock); | |
163 | ||
a6837051 | 164 | loop_lock: |
d84275c9 | 165 | num_run = 0; |
ffbd517d | 166 | |
8b712842 CM |
167 | /* take all the bios off the list at once and process them |
168 | * later on (without the lock held). But, remember the | |
169 | * tail and other pointers so the bios can be properly reinserted | |
170 | * into the list if we hit congestion | |
171 | */ | |
d84275c9 | 172 | if (!force_reg && device->pending_sync_bios.head) { |
ffbd517d | 173 | pending_bios = &device->pending_sync_bios; |
d84275c9 CM |
174 | force_reg = 1; |
175 | } else { | |
ffbd517d | 176 | pending_bios = &device->pending_bios; |
d84275c9 CM |
177 | force_reg = 0; |
178 | } | |
ffbd517d CM |
179 | |
180 | pending = pending_bios->head; | |
181 | tail = pending_bios->tail; | |
8b712842 | 182 | WARN_ON(pending && !tail); |
8b712842 CM |
183 | |
184 | /* | |
185 | * if pending was null this time around, no bios need processing | |
186 | * at all and we can stop. Otherwise it'll loop back up again | |
187 | * and do an additional check so no bios are missed. | |
188 | * | |
189 | * device->running_pending is used to synchronize with the | |
190 | * schedule_bio code. | |
191 | */ | |
ffbd517d CM |
192 | if (device->pending_sync_bios.head == NULL && |
193 | device->pending_bios.head == NULL) { | |
8b712842 CM |
194 | again = 0; |
195 | device->running_pending = 0; | |
ffbd517d CM |
196 | } else { |
197 | again = 1; | |
198 | device->running_pending = 1; | |
8b712842 | 199 | } |
ffbd517d CM |
200 | |
201 | pending_bios->head = NULL; | |
202 | pending_bios->tail = NULL; | |
203 | ||
8b712842 CM |
204 | spin_unlock(&device->io_lock); |
205 | ||
d397712b | 206 | while (pending) { |
ffbd517d CM |
207 | |
208 | rmb(); | |
d84275c9 CM |
209 | /* we want to work on both lists, but do more bios on the |
210 | * sync list than the regular list | |
211 | */ | |
212 | if ((num_run > 32 && | |
213 | pending_bios != &device->pending_sync_bios && | |
214 | device->pending_sync_bios.head) || | |
215 | (num_run > 64 && pending_bios == &device->pending_sync_bios && | |
216 | device->pending_bios.head)) { | |
ffbd517d CM |
217 | spin_lock(&device->io_lock); |
218 | requeue_list(pending_bios, pending, tail); | |
219 | goto loop_lock; | |
220 | } | |
221 | ||
8b712842 CM |
222 | cur = pending; |
223 | pending = pending->bi_next; | |
224 | cur->bi_next = NULL; | |
b64a2851 CM |
225 | atomic_dec(&fs_info->nr_async_bios); |
226 | ||
227 | if (atomic_read(&fs_info->nr_async_bios) < limit && | |
228 | waitqueue_active(&fs_info->async_submit_wait)) | |
229 | wake_up(&fs_info->async_submit_wait); | |
492bb6de CM |
230 | |
231 | BUG_ON(atomic_read(&cur->bi_cnt) == 0); | |
d644d8a1 | 232 | |
2ab1ba68 CM |
233 | /* |
234 | * if we're doing the sync list, record that our | |
235 | * plug has some sync requests on it | |
236 | * | |
237 | * If we're doing the regular list and there are | |
238 | * sync requests sitting around, unplug before | |
239 | * we add more | |
240 | */ | |
241 | if (pending_bios == &device->pending_sync_bios) { | |
242 | sync_pending = 1; | |
243 | } else if (sync_pending) { | |
244 | blk_finish_plug(&plug); | |
245 | blk_start_plug(&plug); | |
246 | sync_pending = 0; | |
247 | } | |
248 | ||
5ff7ba3a CM |
249 | submit_bio(cur->bi_rw, cur); |
250 | num_run++; | |
251 | batch_run++; | |
7eaceacc | 252 | if (need_resched()) |
ffbd517d | 253 | cond_resched(); |
8b712842 CM |
254 | |
255 | /* | |
256 | * we made progress, there is more work to do and the bdi | |
257 | * is now congested. Back off and let other work structs | |
258 | * run instead | |
259 | */ | |
57fd5a5f | 260 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
5f2cc086 | 261 | fs_info->fs_devices->open_devices > 1) { |
b765ead5 | 262 | struct io_context *ioc; |
8b712842 | 263 | |
b765ead5 CM |
264 | ioc = current->io_context; |
265 | ||
266 | /* | |
267 | * the main goal here is that we don't want to | |
268 | * block if we're going to be able to submit | |
269 | * more requests without blocking. | |
270 | * | |
271 | * This code does two great things, it pokes into | |
272 | * the elevator code from a filesystem _and_ | |
273 | * it makes assumptions about how batching works. | |
274 | */ | |
275 | if (ioc && ioc->nr_batch_requests > 0 && | |
276 | time_before(jiffies, ioc->last_waited + HZ/50UL) && | |
277 | (last_waited == 0 || | |
278 | ioc->last_waited == last_waited)) { | |
279 | /* | |
280 | * we want to go through our batch of | |
281 | * requests and stop. So, we copy out | |
282 | * the ioc->last_waited time and test | |
283 | * against it before looping | |
284 | */ | |
285 | last_waited = ioc->last_waited; | |
7eaceacc | 286 | if (need_resched()) |
ffbd517d | 287 | cond_resched(); |
b765ead5 CM |
288 | continue; |
289 | } | |
8b712842 | 290 | spin_lock(&device->io_lock); |
ffbd517d | 291 | requeue_list(pending_bios, pending, tail); |
a6837051 | 292 | device->running_pending = 1; |
8b712842 CM |
293 | |
294 | spin_unlock(&device->io_lock); | |
295 | btrfs_requeue_work(&device->work); | |
296 | goto done; | |
297 | } | |
298 | } | |
ffbd517d | 299 | |
51684082 CM |
300 | cond_resched(); |
301 | if (again) | |
302 | goto loop; | |
303 | ||
304 | spin_lock(&device->io_lock); | |
305 | if (device->pending_bios.head || device->pending_sync_bios.head) | |
306 | goto loop_lock; | |
307 | spin_unlock(&device->io_lock); | |
308 | ||
8b712842 | 309 | done: |
211588ad | 310 | blk_finish_plug(&plug); |
8b712842 CM |
311 | return 0; |
312 | } | |
313 | ||
b2950863 | 314 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
315 | { |
316 | struct btrfs_device *device; | |
317 | ||
318 | device = container_of(work, struct btrfs_device, work); | |
319 | run_scheduled_bios(device); | |
320 | } | |
321 | ||
a1b32a59 | 322 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
323 | struct btrfs_super_block *disk_super, |
324 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
325 | { | |
326 | struct btrfs_device *device; | |
327 | struct btrfs_fs_devices *fs_devices; | |
328 | u64 found_transid = btrfs_super_generation(disk_super); | |
3a0524dc | 329 | char *name; |
8a4b83cc CM |
330 | |
331 | fs_devices = find_fsid(disk_super->fsid); | |
332 | if (!fs_devices) { | |
515dc322 | 333 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
8a4b83cc CM |
334 | if (!fs_devices) |
335 | return -ENOMEM; | |
336 | INIT_LIST_HEAD(&fs_devices->devices); | |
b3075717 | 337 | INIT_LIST_HEAD(&fs_devices->alloc_list); |
8a4b83cc CM |
338 | list_add(&fs_devices->list, &fs_uuids); |
339 | memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); | |
340 | fs_devices->latest_devid = devid; | |
341 | fs_devices->latest_trans = found_transid; | |
e5e9a520 | 342 | mutex_init(&fs_devices->device_list_mutex); |
8a4b83cc CM |
343 | device = NULL; |
344 | } else { | |
a443755f CM |
345 | device = __find_device(&fs_devices->devices, devid, |
346 | disk_super->dev_item.uuid); | |
8a4b83cc CM |
347 | } |
348 | if (!device) { | |
2b82032c YZ |
349 | if (fs_devices->opened) |
350 | return -EBUSY; | |
351 | ||
8a4b83cc CM |
352 | device = kzalloc(sizeof(*device), GFP_NOFS); |
353 | if (!device) { | |
354 | /* we can safely leave the fs_devices entry around */ | |
355 | return -ENOMEM; | |
356 | } | |
357 | device->devid = devid; | |
8b712842 | 358 | device->work.func = pending_bios_fn; |
a443755f CM |
359 | memcpy(device->uuid, disk_super->dev_item.uuid, |
360 | BTRFS_UUID_SIZE); | |
b248a415 | 361 | spin_lock_init(&device->io_lock); |
8a4b83cc CM |
362 | device->name = kstrdup(path, GFP_NOFS); |
363 | if (!device->name) { | |
364 | kfree(device); | |
365 | return -ENOMEM; | |
366 | } | |
2b82032c | 367 | INIT_LIST_HEAD(&device->dev_alloc_list); |
e5e9a520 CM |
368 | |
369 | mutex_lock(&fs_devices->device_list_mutex); | |
1f78160c | 370 | list_add_rcu(&device->dev_list, &fs_devices->devices); |
e5e9a520 CM |
371 | mutex_unlock(&fs_devices->device_list_mutex); |
372 | ||
2b82032c | 373 | device->fs_devices = fs_devices; |
8a4b83cc | 374 | fs_devices->num_devices++; |
cd02dca5 | 375 | } else if (!device->name || strcmp(device->name, path)) { |
3a0524dc TH |
376 | name = kstrdup(path, GFP_NOFS); |
377 | if (!name) | |
378 | return -ENOMEM; | |
379 | kfree(device->name); | |
380 | device->name = name; | |
cd02dca5 CM |
381 | if (device->missing) { |
382 | fs_devices->missing_devices--; | |
383 | device->missing = 0; | |
384 | } | |
8a4b83cc CM |
385 | } |
386 | ||
387 | if (found_transid > fs_devices->latest_trans) { | |
388 | fs_devices->latest_devid = devid; | |
389 | fs_devices->latest_trans = found_transid; | |
390 | } | |
8a4b83cc CM |
391 | *fs_devices_ret = fs_devices; |
392 | return 0; | |
393 | } | |
394 | ||
e4404d6e YZ |
395 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
396 | { | |
397 | struct btrfs_fs_devices *fs_devices; | |
398 | struct btrfs_device *device; | |
399 | struct btrfs_device *orig_dev; | |
400 | ||
401 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); | |
402 | if (!fs_devices) | |
403 | return ERR_PTR(-ENOMEM); | |
404 | ||
405 | INIT_LIST_HEAD(&fs_devices->devices); | |
406 | INIT_LIST_HEAD(&fs_devices->alloc_list); | |
407 | INIT_LIST_HEAD(&fs_devices->list); | |
e5e9a520 | 408 | mutex_init(&fs_devices->device_list_mutex); |
e4404d6e YZ |
409 | fs_devices->latest_devid = orig->latest_devid; |
410 | fs_devices->latest_trans = orig->latest_trans; | |
411 | memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid)); | |
412 | ||
46224705 | 413 | /* We have held the volume lock, it is safe to get the devices. */ |
e4404d6e YZ |
414 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
415 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
416 | if (!device) | |
417 | goto error; | |
418 | ||
419 | device->name = kstrdup(orig_dev->name, GFP_NOFS); | |
fd2696f3 JL |
420 | if (!device->name) { |
421 | kfree(device); | |
e4404d6e | 422 | goto error; |
fd2696f3 | 423 | } |
e4404d6e YZ |
424 | |
425 | device->devid = orig_dev->devid; | |
426 | device->work.func = pending_bios_fn; | |
427 | memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid)); | |
e4404d6e YZ |
428 | spin_lock_init(&device->io_lock); |
429 | INIT_LIST_HEAD(&device->dev_list); | |
430 | INIT_LIST_HEAD(&device->dev_alloc_list); | |
431 | ||
432 | list_add(&device->dev_list, &fs_devices->devices); | |
433 | device->fs_devices = fs_devices; | |
434 | fs_devices->num_devices++; | |
435 | } | |
436 | return fs_devices; | |
437 | error: | |
438 | free_fs_devices(fs_devices); | |
439 | return ERR_PTR(-ENOMEM); | |
440 | } | |
441 | ||
dfe25020 CM |
442 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices) |
443 | { | |
c6e30871 | 444 | struct btrfs_device *device, *next; |
dfe25020 CM |
445 | |
446 | mutex_lock(&uuid_mutex); | |
447 | again: | |
46224705 | 448 | /* This is the initialized path, it is safe to release the devices. */ |
c6e30871 | 449 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
2b82032c YZ |
450 | if (device->in_fs_metadata) |
451 | continue; | |
452 | ||
453 | if (device->bdev) { | |
d4d77629 | 454 | blkdev_put(device->bdev, device->mode); |
2b82032c YZ |
455 | device->bdev = NULL; |
456 | fs_devices->open_devices--; | |
457 | } | |
458 | if (device->writeable) { | |
459 | list_del_init(&device->dev_alloc_list); | |
460 | device->writeable = 0; | |
461 | fs_devices->rw_devices--; | |
462 | } | |
e4404d6e YZ |
463 | list_del_init(&device->dev_list); |
464 | fs_devices->num_devices--; | |
465 | kfree(device->name); | |
466 | kfree(device); | |
dfe25020 | 467 | } |
2b82032c YZ |
468 | |
469 | if (fs_devices->seed) { | |
470 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
471 | goto again; |
472 | } | |
473 | ||
dfe25020 CM |
474 | mutex_unlock(&uuid_mutex); |
475 | return 0; | |
476 | } | |
a0af469b | 477 | |
1f78160c XG |
478 | static void __free_device(struct work_struct *work) |
479 | { | |
480 | struct btrfs_device *device; | |
481 | ||
482 | device = container_of(work, struct btrfs_device, rcu_work); | |
483 | ||
484 | if (device->bdev) | |
485 | blkdev_put(device->bdev, device->mode); | |
486 | ||
487 | kfree(device->name); | |
488 | kfree(device); | |
489 | } | |
490 | ||
491 | static void free_device(struct rcu_head *head) | |
492 | { | |
493 | struct btrfs_device *device; | |
494 | ||
495 | device = container_of(head, struct btrfs_device, rcu); | |
496 | ||
497 | INIT_WORK(&device->rcu_work, __free_device); | |
498 | schedule_work(&device->rcu_work); | |
499 | } | |
500 | ||
2b82032c | 501 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 502 | { |
8a4b83cc | 503 | struct btrfs_device *device; |
e4404d6e | 504 | |
2b82032c YZ |
505 | if (--fs_devices->opened > 0) |
506 | return 0; | |
8a4b83cc | 507 | |
c9513edb | 508 | mutex_lock(&fs_devices->device_list_mutex); |
c6e30871 | 509 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
1f78160c XG |
510 | struct btrfs_device *new_device; |
511 | ||
512 | if (device->bdev) | |
a0af469b | 513 | fs_devices->open_devices--; |
1f78160c | 514 | |
2b82032c YZ |
515 | if (device->writeable) { |
516 | list_del_init(&device->dev_alloc_list); | |
517 | fs_devices->rw_devices--; | |
518 | } | |
519 | ||
d5e2003c JB |
520 | if (device->can_discard) |
521 | fs_devices->num_can_discard--; | |
522 | ||
1f78160c XG |
523 | new_device = kmalloc(sizeof(*new_device), GFP_NOFS); |
524 | BUG_ON(!new_device); | |
525 | memcpy(new_device, device, sizeof(*new_device)); | |
526 | new_device->name = kstrdup(device->name, GFP_NOFS); | |
5f3f302a | 527 | BUG_ON(device->name && !new_device->name); |
1f78160c XG |
528 | new_device->bdev = NULL; |
529 | new_device->writeable = 0; | |
530 | new_device->in_fs_metadata = 0; | |
d5e2003c | 531 | new_device->can_discard = 0; |
1f78160c XG |
532 | list_replace_rcu(&device->dev_list, &new_device->dev_list); |
533 | ||
534 | call_rcu(&device->rcu, free_device); | |
8a4b83cc | 535 | } |
c9513edb XG |
536 | mutex_unlock(&fs_devices->device_list_mutex); |
537 | ||
e4404d6e YZ |
538 | WARN_ON(fs_devices->open_devices); |
539 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
540 | fs_devices->opened = 0; |
541 | fs_devices->seeding = 0; | |
2b82032c | 542 | |
8a4b83cc CM |
543 | return 0; |
544 | } | |
545 | ||
2b82032c YZ |
546 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
547 | { | |
e4404d6e | 548 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
549 | int ret; |
550 | ||
551 | mutex_lock(&uuid_mutex); | |
552 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
553 | if (!fs_devices->opened) { |
554 | seed_devices = fs_devices->seed; | |
555 | fs_devices->seed = NULL; | |
556 | } | |
2b82032c | 557 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
558 | |
559 | while (seed_devices) { | |
560 | fs_devices = seed_devices; | |
561 | seed_devices = fs_devices->seed; | |
562 | __btrfs_close_devices(fs_devices); | |
563 | free_fs_devices(fs_devices); | |
564 | } | |
2b82032c YZ |
565 | return ret; |
566 | } | |
567 | ||
e4404d6e YZ |
568 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
569 | fmode_t flags, void *holder) | |
8a4b83cc | 570 | { |
d5e2003c | 571 | struct request_queue *q; |
8a4b83cc CM |
572 | struct block_device *bdev; |
573 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 574 | struct btrfs_device *device; |
a0af469b CM |
575 | struct block_device *latest_bdev = NULL; |
576 | struct buffer_head *bh; | |
577 | struct btrfs_super_block *disk_super; | |
578 | u64 latest_devid = 0; | |
579 | u64 latest_transid = 0; | |
a0af469b | 580 | u64 devid; |
2b82032c | 581 | int seeding = 1; |
a0af469b | 582 | int ret = 0; |
8a4b83cc | 583 | |
d4d77629 TH |
584 | flags |= FMODE_EXCL; |
585 | ||
c6e30871 | 586 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
587 | if (device->bdev) |
588 | continue; | |
dfe25020 CM |
589 | if (!device->name) |
590 | continue; | |
591 | ||
d4d77629 | 592 | bdev = blkdev_get_by_path(device->name, flags, holder); |
8a4b83cc | 593 | if (IS_ERR(bdev)) { |
d397712b | 594 | printk(KERN_INFO "open %s failed\n", device->name); |
a0af469b | 595 | goto error; |
8a4b83cc | 596 | } |
a061fc8d | 597 | set_blocksize(bdev, 4096); |
a0af469b | 598 | |
a512bbf8 | 599 | bh = btrfs_read_dev_super(bdev); |
20b45077 DY |
600 | if (!bh) { |
601 | ret = -EINVAL; | |
a0af469b | 602 | goto error_close; |
20b45077 | 603 | } |
a0af469b CM |
604 | |
605 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 606 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
a0af469b CM |
607 | if (devid != device->devid) |
608 | goto error_brelse; | |
609 | ||
2b82032c YZ |
610 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
611 | BTRFS_UUID_SIZE)) | |
612 | goto error_brelse; | |
613 | ||
614 | device->generation = btrfs_super_generation(disk_super); | |
615 | if (!latest_transid || device->generation > latest_transid) { | |
a0af469b | 616 | latest_devid = devid; |
2b82032c | 617 | latest_transid = device->generation; |
a0af469b CM |
618 | latest_bdev = bdev; |
619 | } | |
620 | ||
2b82032c YZ |
621 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
622 | device->writeable = 0; | |
623 | } else { | |
624 | device->writeable = !bdev_read_only(bdev); | |
625 | seeding = 0; | |
626 | } | |
627 | ||
d5e2003c JB |
628 | q = bdev_get_queue(bdev); |
629 | if (blk_queue_discard(q)) { | |
630 | device->can_discard = 1; | |
631 | fs_devices->num_can_discard++; | |
632 | } | |
633 | ||
8a4b83cc | 634 | device->bdev = bdev; |
dfe25020 | 635 | device->in_fs_metadata = 0; |
15916de8 CM |
636 | device->mode = flags; |
637 | ||
c289811c CM |
638 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
639 | fs_devices->rotating = 1; | |
640 | ||
a0af469b | 641 | fs_devices->open_devices++; |
2b82032c YZ |
642 | if (device->writeable) { |
643 | fs_devices->rw_devices++; | |
644 | list_add(&device->dev_alloc_list, | |
645 | &fs_devices->alloc_list); | |
646 | } | |
4f6c9328 | 647 | brelse(bh); |
a0af469b | 648 | continue; |
a061fc8d | 649 | |
a0af469b CM |
650 | error_brelse: |
651 | brelse(bh); | |
652 | error_close: | |
d4d77629 | 653 | blkdev_put(bdev, flags); |
a0af469b CM |
654 | error: |
655 | continue; | |
8a4b83cc | 656 | } |
a0af469b CM |
657 | if (fs_devices->open_devices == 0) { |
658 | ret = -EIO; | |
659 | goto out; | |
660 | } | |
2b82032c YZ |
661 | fs_devices->seeding = seeding; |
662 | fs_devices->opened = 1; | |
a0af469b CM |
663 | fs_devices->latest_bdev = latest_bdev; |
664 | fs_devices->latest_devid = latest_devid; | |
665 | fs_devices->latest_trans = latest_transid; | |
2b82032c | 666 | fs_devices->total_rw_bytes = 0; |
a0af469b | 667 | out: |
2b82032c YZ |
668 | return ret; |
669 | } | |
670 | ||
671 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 672 | fmode_t flags, void *holder) |
2b82032c YZ |
673 | { |
674 | int ret; | |
675 | ||
676 | mutex_lock(&uuid_mutex); | |
677 | if (fs_devices->opened) { | |
e4404d6e YZ |
678 | fs_devices->opened++; |
679 | ret = 0; | |
2b82032c | 680 | } else { |
15916de8 | 681 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 682 | } |
8a4b83cc | 683 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
684 | return ret; |
685 | } | |
686 | ||
97288f2c | 687 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
688 | struct btrfs_fs_devices **fs_devices_ret) |
689 | { | |
690 | struct btrfs_super_block *disk_super; | |
691 | struct block_device *bdev; | |
692 | struct buffer_head *bh; | |
693 | int ret; | |
694 | u64 devid; | |
f2984462 | 695 | u64 transid; |
8a4b83cc CM |
696 | |
697 | mutex_lock(&uuid_mutex); | |
698 | ||
d4d77629 TH |
699 | flags |= FMODE_EXCL; |
700 | bdev = blkdev_get_by_path(path, flags, holder); | |
8a4b83cc CM |
701 | |
702 | if (IS_ERR(bdev)) { | |
8a4b83cc CM |
703 | ret = PTR_ERR(bdev); |
704 | goto error; | |
705 | } | |
706 | ||
707 | ret = set_blocksize(bdev, 4096); | |
708 | if (ret) | |
709 | goto error_close; | |
a512bbf8 | 710 | bh = btrfs_read_dev_super(bdev); |
8a4b83cc | 711 | if (!bh) { |
20b45077 | 712 | ret = -EINVAL; |
8a4b83cc CM |
713 | goto error_close; |
714 | } | |
715 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 716 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
f2984462 | 717 | transid = btrfs_super_generation(disk_super); |
7ae9c09d | 718 | if (disk_super->label[0]) |
d397712b | 719 | printk(KERN_INFO "device label %s ", disk_super->label); |
22b63a29 ID |
720 | else |
721 | printk(KERN_INFO "device fsid %pU ", disk_super->fsid); | |
119e10cf | 722 | printk(KERN_CONT "devid %llu transid %llu %s\n", |
d397712b | 723 | (unsigned long long)devid, (unsigned long long)transid, path); |
8a4b83cc CM |
724 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
725 | ||
8a4b83cc CM |
726 | brelse(bh); |
727 | error_close: | |
d4d77629 | 728 | blkdev_put(bdev, flags); |
8a4b83cc CM |
729 | error: |
730 | mutex_unlock(&uuid_mutex); | |
731 | return ret; | |
732 | } | |
0b86a832 | 733 | |
6d07bcec MX |
734 | /* helper to account the used device space in the range */ |
735 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, | |
736 | u64 end, u64 *length) | |
737 | { | |
738 | struct btrfs_key key; | |
739 | struct btrfs_root *root = device->dev_root; | |
740 | struct btrfs_dev_extent *dev_extent; | |
741 | struct btrfs_path *path; | |
742 | u64 extent_end; | |
743 | int ret; | |
744 | int slot; | |
745 | struct extent_buffer *l; | |
746 | ||
747 | *length = 0; | |
748 | ||
749 | if (start >= device->total_bytes) | |
750 | return 0; | |
751 | ||
752 | path = btrfs_alloc_path(); | |
753 | if (!path) | |
754 | return -ENOMEM; | |
755 | path->reada = 2; | |
756 | ||
757 | key.objectid = device->devid; | |
758 | key.offset = start; | |
759 | key.type = BTRFS_DEV_EXTENT_KEY; | |
760 | ||
761 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
762 | if (ret < 0) | |
763 | goto out; | |
764 | if (ret > 0) { | |
765 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
766 | if (ret < 0) | |
767 | goto out; | |
768 | } | |
769 | ||
770 | while (1) { | |
771 | l = path->nodes[0]; | |
772 | slot = path->slots[0]; | |
773 | if (slot >= btrfs_header_nritems(l)) { | |
774 | ret = btrfs_next_leaf(root, path); | |
775 | if (ret == 0) | |
776 | continue; | |
777 | if (ret < 0) | |
778 | goto out; | |
779 | ||
780 | break; | |
781 | } | |
782 | btrfs_item_key_to_cpu(l, &key, slot); | |
783 | ||
784 | if (key.objectid < device->devid) | |
785 | goto next; | |
786 | ||
787 | if (key.objectid > device->devid) | |
788 | break; | |
789 | ||
790 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) | |
791 | goto next; | |
792 | ||
793 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
794 | extent_end = key.offset + btrfs_dev_extent_length(l, | |
795 | dev_extent); | |
796 | if (key.offset <= start && extent_end > end) { | |
797 | *length = end - start + 1; | |
798 | break; | |
799 | } else if (key.offset <= start && extent_end > start) | |
800 | *length += extent_end - start; | |
801 | else if (key.offset > start && extent_end <= end) | |
802 | *length += extent_end - key.offset; | |
803 | else if (key.offset > start && key.offset <= end) { | |
804 | *length += end - key.offset + 1; | |
805 | break; | |
806 | } else if (key.offset > end) | |
807 | break; | |
808 | ||
809 | next: | |
810 | path->slots[0]++; | |
811 | } | |
812 | ret = 0; | |
813 | out: | |
814 | btrfs_free_path(path); | |
815 | return ret; | |
816 | } | |
817 | ||
0b86a832 | 818 | /* |
7bfc837d MX |
819 | * find_free_dev_extent - find free space in the specified device |
820 | * @trans: transaction handler | |
821 | * @device: the device which we search the free space in | |
822 | * @num_bytes: the size of the free space that we need | |
823 | * @start: store the start of the free space. | |
824 | * @len: the size of the free space. that we find, or the size of the max | |
825 | * free space if we don't find suitable free space | |
826 | * | |
0b86a832 CM |
827 | * this uses a pretty simple search, the expectation is that it is |
828 | * called very infrequently and that a given device has a small number | |
829 | * of extents | |
7bfc837d MX |
830 | * |
831 | * @start is used to store the start of the free space if we find. But if we | |
832 | * don't find suitable free space, it will be used to store the start position | |
833 | * of the max free space. | |
834 | * | |
835 | * @len is used to store the size of the free space that we find. | |
836 | * But if we don't find suitable free space, it is used to store the size of | |
837 | * the max free space. | |
0b86a832 | 838 | */ |
ba1bf481 JB |
839 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
840 | struct btrfs_device *device, u64 num_bytes, | |
7bfc837d | 841 | u64 *start, u64 *len) |
0b86a832 CM |
842 | { |
843 | struct btrfs_key key; | |
844 | struct btrfs_root *root = device->dev_root; | |
7bfc837d | 845 | struct btrfs_dev_extent *dev_extent; |
2b82032c | 846 | struct btrfs_path *path; |
7bfc837d MX |
847 | u64 hole_size; |
848 | u64 max_hole_start; | |
849 | u64 max_hole_size; | |
850 | u64 extent_end; | |
851 | u64 search_start; | |
0b86a832 CM |
852 | u64 search_end = device->total_bytes; |
853 | int ret; | |
7bfc837d | 854 | int slot; |
0b86a832 CM |
855 | struct extent_buffer *l; |
856 | ||
0b86a832 CM |
857 | /* FIXME use last free of some kind */ |
858 | ||
8a4b83cc CM |
859 | /* we don't want to overwrite the superblock on the drive, |
860 | * so we make sure to start at an offset of at least 1MB | |
861 | */ | |
a9c9bf68 | 862 | search_start = max(root->fs_info->alloc_start, 1024ull * 1024); |
8f18cf13 | 863 | |
7bfc837d MX |
864 | max_hole_start = search_start; |
865 | max_hole_size = 0; | |
866 | ||
867 | if (search_start >= search_end) { | |
868 | ret = -ENOSPC; | |
869 | goto error; | |
870 | } | |
871 | ||
872 | path = btrfs_alloc_path(); | |
873 | if (!path) { | |
874 | ret = -ENOMEM; | |
875 | goto error; | |
876 | } | |
877 | path->reada = 2; | |
878 | ||
0b86a832 CM |
879 | key.objectid = device->devid; |
880 | key.offset = search_start; | |
881 | key.type = BTRFS_DEV_EXTENT_KEY; | |
7bfc837d | 882 | |
0b86a832 CM |
883 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); |
884 | if (ret < 0) | |
7bfc837d | 885 | goto out; |
1fcbac58 YZ |
886 | if (ret > 0) { |
887 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
888 | if (ret < 0) | |
7bfc837d | 889 | goto out; |
1fcbac58 | 890 | } |
7bfc837d | 891 | |
0b86a832 CM |
892 | while (1) { |
893 | l = path->nodes[0]; | |
894 | slot = path->slots[0]; | |
895 | if (slot >= btrfs_header_nritems(l)) { | |
896 | ret = btrfs_next_leaf(root, path); | |
897 | if (ret == 0) | |
898 | continue; | |
899 | if (ret < 0) | |
7bfc837d MX |
900 | goto out; |
901 | ||
902 | break; | |
0b86a832 CM |
903 | } |
904 | btrfs_item_key_to_cpu(l, &key, slot); | |
905 | ||
906 | if (key.objectid < device->devid) | |
907 | goto next; | |
908 | ||
909 | if (key.objectid > device->devid) | |
7bfc837d | 910 | break; |
0b86a832 | 911 | |
7bfc837d MX |
912 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) |
913 | goto next; | |
9779b72f | 914 | |
7bfc837d MX |
915 | if (key.offset > search_start) { |
916 | hole_size = key.offset - search_start; | |
9779b72f | 917 | |
7bfc837d MX |
918 | if (hole_size > max_hole_size) { |
919 | max_hole_start = search_start; | |
920 | max_hole_size = hole_size; | |
921 | } | |
9779b72f | 922 | |
7bfc837d MX |
923 | /* |
924 | * If this free space is greater than which we need, | |
925 | * it must be the max free space that we have found | |
926 | * until now, so max_hole_start must point to the start | |
927 | * of this free space and the length of this free space | |
928 | * is stored in max_hole_size. Thus, we return | |
929 | * max_hole_start and max_hole_size and go back to the | |
930 | * caller. | |
931 | */ | |
932 | if (hole_size >= num_bytes) { | |
933 | ret = 0; | |
934 | goto out; | |
0b86a832 CM |
935 | } |
936 | } | |
0b86a832 | 937 | |
0b86a832 | 938 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
7bfc837d MX |
939 | extent_end = key.offset + btrfs_dev_extent_length(l, |
940 | dev_extent); | |
941 | if (extent_end > search_start) | |
942 | search_start = extent_end; | |
0b86a832 CM |
943 | next: |
944 | path->slots[0]++; | |
945 | cond_resched(); | |
946 | } | |
0b86a832 | 947 | |
7bfc837d MX |
948 | hole_size = search_end- search_start; |
949 | if (hole_size > max_hole_size) { | |
950 | max_hole_start = search_start; | |
951 | max_hole_size = hole_size; | |
0b86a832 | 952 | } |
0b86a832 | 953 | |
7bfc837d MX |
954 | /* See above. */ |
955 | if (hole_size < num_bytes) | |
956 | ret = -ENOSPC; | |
957 | else | |
958 | ret = 0; | |
959 | ||
960 | out: | |
2b82032c | 961 | btrfs_free_path(path); |
7bfc837d MX |
962 | error: |
963 | *start = max_hole_start; | |
b2117a39 | 964 | if (len) |
7bfc837d | 965 | *len = max_hole_size; |
0b86a832 CM |
966 | return ret; |
967 | } | |
968 | ||
b2950863 | 969 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
970 | struct btrfs_device *device, |
971 | u64 start) | |
972 | { | |
973 | int ret; | |
974 | struct btrfs_path *path; | |
975 | struct btrfs_root *root = device->dev_root; | |
976 | struct btrfs_key key; | |
a061fc8d CM |
977 | struct btrfs_key found_key; |
978 | struct extent_buffer *leaf = NULL; | |
979 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
980 | |
981 | path = btrfs_alloc_path(); | |
982 | if (!path) | |
983 | return -ENOMEM; | |
984 | ||
985 | key.objectid = device->devid; | |
986 | key.offset = start; | |
987 | key.type = BTRFS_DEV_EXTENT_KEY; | |
988 | ||
989 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
a061fc8d CM |
990 | if (ret > 0) { |
991 | ret = btrfs_previous_item(root, path, key.objectid, | |
992 | BTRFS_DEV_EXTENT_KEY); | |
b0b802d7 TI |
993 | if (ret) |
994 | goto out; | |
a061fc8d CM |
995 | leaf = path->nodes[0]; |
996 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
997 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
998 | struct btrfs_dev_extent); | |
999 | BUG_ON(found_key.offset > start || found_key.offset + | |
1000 | btrfs_dev_extent_length(leaf, extent) < start); | |
a061fc8d CM |
1001 | } else if (ret == 0) { |
1002 | leaf = path->nodes[0]; | |
1003 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1004 | struct btrfs_dev_extent); | |
1005 | } | |
8f18cf13 CM |
1006 | BUG_ON(ret); |
1007 | ||
dfe25020 CM |
1008 | if (device->bytes_used > 0) |
1009 | device->bytes_used -= btrfs_dev_extent_length(leaf, extent); | |
8f18cf13 | 1010 | ret = btrfs_del_item(trans, root, path); |
8f18cf13 | 1011 | |
b0b802d7 | 1012 | out: |
8f18cf13 CM |
1013 | btrfs_free_path(path); |
1014 | return ret; | |
1015 | } | |
1016 | ||
2b82032c | 1017 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
0b86a832 | 1018 | struct btrfs_device *device, |
e17cade2 | 1019 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 1020 | u64 chunk_offset, u64 start, u64 num_bytes) |
0b86a832 CM |
1021 | { |
1022 | int ret; | |
1023 | struct btrfs_path *path; | |
1024 | struct btrfs_root *root = device->dev_root; | |
1025 | struct btrfs_dev_extent *extent; | |
1026 | struct extent_buffer *leaf; | |
1027 | struct btrfs_key key; | |
1028 | ||
dfe25020 | 1029 | WARN_ON(!device->in_fs_metadata); |
0b86a832 CM |
1030 | path = btrfs_alloc_path(); |
1031 | if (!path) | |
1032 | return -ENOMEM; | |
1033 | ||
0b86a832 | 1034 | key.objectid = device->devid; |
2b82032c | 1035 | key.offset = start; |
0b86a832 CM |
1036 | key.type = BTRFS_DEV_EXTENT_KEY; |
1037 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1038 | sizeof(*extent)); | |
1039 | BUG_ON(ret); | |
1040 | ||
1041 | leaf = path->nodes[0]; | |
1042 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1043 | struct btrfs_dev_extent); | |
e17cade2 CM |
1044 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
1045 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
1046 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
1047 | ||
1048 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
1049 | (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), | |
1050 | BTRFS_UUID_SIZE); | |
1051 | ||
0b86a832 CM |
1052 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
1053 | btrfs_mark_buffer_dirty(leaf); | |
0b86a832 CM |
1054 | btrfs_free_path(path); |
1055 | return ret; | |
1056 | } | |
1057 | ||
a1b32a59 CM |
1058 | static noinline int find_next_chunk(struct btrfs_root *root, |
1059 | u64 objectid, u64 *offset) | |
0b86a832 CM |
1060 | { |
1061 | struct btrfs_path *path; | |
1062 | int ret; | |
1063 | struct btrfs_key key; | |
e17cade2 | 1064 | struct btrfs_chunk *chunk; |
0b86a832 CM |
1065 | struct btrfs_key found_key; |
1066 | ||
1067 | path = btrfs_alloc_path(); | |
92b8e897 MF |
1068 | if (!path) |
1069 | return -ENOMEM; | |
0b86a832 | 1070 | |
e17cade2 | 1071 | key.objectid = objectid; |
0b86a832 CM |
1072 | key.offset = (u64)-1; |
1073 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1074 | ||
1075 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1076 | if (ret < 0) | |
1077 | goto error; | |
1078 | ||
1079 | BUG_ON(ret == 0); | |
1080 | ||
1081 | ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY); | |
1082 | if (ret) { | |
e17cade2 | 1083 | *offset = 0; |
0b86a832 CM |
1084 | } else { |
1085 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1086 | path->slots[0]); | |
e17cade2 CM |
1087 | if (found_key.objectid != objectid) |
1088 | *offset = 0; | |
1089 | else { | |
1090 | chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1091 | struct btrfs_chunk); | |
1092 | *offset = found_key.offset + | |
1093 | btrfs_chunk_length(path->nodes[0], chunk); | |
1094 | } | |
0b86a832 CM |
1095 | } |
1096 | ret = 0; | |
1097 | error: | |
1098 | btrfs_free_path(path); | |
1099 | return ret; | |
1100 | } | |
1101 | ||
2b82032c | 1102 | static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid) |
0b86a832 CM |
1103 | { |
1104 | int ret; | |
1105 | struct btrfs_key key; | |
1106 | struct btrfs_key found_key; | |
2b82032c YZ |
1107 | struct btrfs_path *path; |
1108 | ||
1109 | root = root->fs_info->chunk_root; | |
1110 | ||
1111 | path = btrfs_alloc_path(); | |
1112 | if (!path) | |
1113 | return -ENOMEM; | |
0b86a832 CM |
1114 | |
1115 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1116 | key.type = BTRFS_DEV_ITEM_KEY; | |
1117 | key.offset = (u64)-1; | |
1118 | ||
1119 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1120 | if (ret < 0) | |
1121 | goto error; | |
1122 | ||
1123 | BUG_ON(ret == 0); | |
1124 | ||
1125 | ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID, | |
1126 | BTRFS_DEV_ITEM_KEY); | |
1127 | if (ret) { | |
1128 | *objectid = 1; | |
1129 | } else { | |
1130 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1131 | path->slots[0]); | |
1132 | *objectid = found_key.offset + 1; | |
1133 | } | |
1134 | ret = 0; | |
1135 | error: | |
2b82032c | 1136 | btrfs_free_path(path); |
0b86a832 CM |
1137 | return ret; |
1138 | } | |
1139 | ||
1140 | /* | |
1141 | * the device information is stored in the chunk root | |
1142 | * the btrfs_device struct should be fully filled in | |
1143 | */ | |
1144 | int btrfs_add_device(struct btrfs_trans_handle *trans, | |
1145 | struct btrfs_root *root, | |
1146 | struct btrfs_device *device) | |
1147 | { | |
1148 | int ret; | |
1149 | struct btrfs_path *path; | |
1150 | struct btrfs_dev_item *dev_item; | |
1151 | struct extent_buffer *leaf; | |
1152 | struct btrfs_key key; | |
1153 | unsigned long ptr; | |
0b86a832 CM |
1154 | |
1155 | root = root->fs_info->chunk_root; | |
1156 | ||
1157 | path = btrfs_alloc_path(); | |
1158 | if (!path) | |
1159 | return -ENOMEM; | |
1160 | ||
0b86a832 CM |
1161 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1162 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 1163 | key.offset = device->devid; |
0b86a832 CM |
1164 | |
1165 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 1166 | sizeof(*dev_item)); |
0b86a832 CM |
1167 | if (ret) |
1168 | goto out; | |
1169 | ||
1170 | leaf = path->nodes[0]; | |
1171 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1172 | ||
1173 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 1174 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
1175 | btrfs_set_device_type(leaf, dev_item, device->type); |
1176 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1177 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1178 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
1179 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
1180 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
e17cade2 CM |
1181 | btrfs_set_device_group(leaf, dev_item, 0); |
1182 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
1183 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 1184 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 1185 | |
0b86a832 | 1186 | ptr = (unsigned long)btrfs_device_uuid(dev_item); |
e17cade2 | 1187 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
2b82032c YZ |
1188 | ptr = (unsigned long)btrfs_device_fsid(dev_item); |
1189 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); | |
0b86a832 | 1190 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 1191 | |
2b82032c | 1192 | ret = 0; |
0b86a832 CM |
1193 | out: |
1194 | btrfs_free_path(path); | |
1195 | return ret; | |
1196 | } | |
8f18cf13 | 1197 | |
a061fc8d CM |
1198 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
1199 | struct btrfs_device *device) | |
1200 | { | |
1201 | int ret; | |
1202 | struct btrfs_path *path; | |
a061fc8d | 1203 | struct btrfs_key key; |
a061fc8d CM |
1204 | struct btrfs_trans_handle *trans; |
1205 | ||
1206 | root = root->fs_info->chunk_root; | |
1207 | ||
1208 | path = btrfs_alloc_path(); | |
1209 | if (!path) | |
1210 | return -ENOMEM; | |
1211 | ||
a22285a6 | 1212 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1213 | if (IS_ERR(trans)) { |
1214 | btrfs_free_path(path); | |
1215 | return PTR_ERR(trans); | |
1216 | } | |
a061fc8d CM |
1217 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1218 | key.type = BTRFS_DEV_ITEM_KEY; | |
1219 | key.offset = device->devid; | |
7d9eb12c | 1220 | lock_chunks(root); |
a061fc8d CM |
1221 | |
1222 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1223 | if (ret < 0) | |
1224 | goto out; | |
1225 | ||
1226 | if (ret > 0) { | |
1227 | ret = -ENOENT; | |
1228 | goto out; | |
1229 | } | |
1230 | ||
1231 | ret = btrfs_del_item(trans, root, path); | |
1232 | if (ret) | |
1233 | goto out; | |
a061fc8d CM |
1234 | out: |
1235 | btrfs_free_path(path); | |
7d9eb12c | 1236 | unlock_chunks(root); |
a061fc8d CM |
1237 | btrfs_commit_transaction(trans, root); |
1238 | return ret; | |
1239 | } | |
1240 | ||
1241 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
1242 | { | |
1243 | struct btrfs_device *device; | |
2b82032c | 1244 | struct btrfs_device *next_device; |
a061fc8d | 1245 | struct block_device *bdev; |
dfe25020 | 1246 | struct buffer_head *bh = NULL; |
a061fc8d | 1247 | struct btrfs_super_block *disk_super; |
1f78160c | 1248 | struct btrfs_fs_devices *cur_devices; |
a061fc8d CM |
1249 | u64 all_avail; |
1250 | u64 devid; | |
2b82032c YZ |
1251 | u64 num_devices; |
1252 | u8 *dev_uuid; | |
a061fc8d | 1253 | int ret = 0; |
1f78160c | 1254 | bool clear_super = false; |
a061fc8d | 1255 | |
a061fc8d | 1256 | mutex_lock(&uuid_mutex); |
7d9eb12c | 1257 | mutex_lock(&root->fs_info->volume_mutex); |
a061fc8d CM |
1258 | |
1259 | all_avail = root->fs_info->avail_data_alloc_bits | | |
1260 | root->fs_info->avail_system_alloc_bits | | |
1261 | root->fs_info->avail_metadata_alloc_bits; | |
1262 | ||
1263 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && | |
035fe03a | 1264 | root->fs_info->fs_devices->num_devices <= 4) { |
d397712b CM |
1265 | printk(KERN_ERR "btrfs: unable to go below four devices " |
1266 | "on raid10\n"); | |
a061fc8d CM |
1267 | ret = -EINVAL; |
1268 | goto out; | |
1269 | } | |
1270 | ||
1271 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && | |
035fe03a | 1272 | root->fs_info->fs_devices->num_devices <= 2) { |
d397712b CM |
1273 | printk(KERN_ERR "btrfs: unable to go below two " |
1274 | "devices on raid1\n"); | |
a061fc8d CM |
1275 | ret = -EINVAL; |
1276 | goto out; | |
1277 | } | |
1278 | ||
dfe25020 | 1279 | if (strcmp(device_path, "missing") == 0) { |
dfe25020 CM |
1280 | struct list_head *devices; |
1281 | struct btrfs_device *tmp; | |
a061fc8d | 1282 | |
dfe25020 CM |
1283 | device = NULL; |
1284 | devices = &root->fs_info->fs_devices->devices; | |
46224705 XG |
1285 | /* |
1286 | * It is safe to read the devices since the volume_mutex | |
1287 | * is held. | |
1288 | */ | |
c6e30871 | 1289 | list_for_each_entry(tmp, devices, dev_list) { |
dfe25020 CM |
1290 | if (tmp->in_fs_metadata && !tmp->bdev) { |
1291 | device = tmp; | |
1292 | break; | |
1293 | } | |
1294 | } | |
1295 | bdev = NULL; | |
1296 | bh = NULL; | |
1297 | disk_super = NULL; | |
1298 | if (!device) { | |
d397712b CM |
1299 | printk(KERN_ERR "btrfs: no missing devices found to " |
1300 | "remove\n"); | |
dfe25020 CM |
1301 | goto out; |
1302 | } | |
dfe25020 | 1303 | } else { |
d4d77629 TH |
1304 | bdev = blkdev_get_by_path(device_path, FMODE_READ | FMODE_EXCL, |
1305 | root->fs_info->bdev_holder); | |
dfe25020 CM |
1306 | if (IS_ERR(bdev)) { |
1307 | ret = PTR_ERR(bdev); | |
1308 | goto out; | |
1309 | } | |
a061fc8d | 1310 | |
2b82032c | 1311 | set_blocksize(bdev, 4096); |
a512bbf8 | 1312 | bh = btrfs_read_dev_super(bdev); |
dfe25020 | 1313 | if (!bh) { |
20b45077 | 1314 | ret = -EINVAL; |
dfe25020 CM |
1315 | goto error_close; |
1316 | } | |
1317 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 1318 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
2b82032c YZ |
1319 | dev_uuid = disk_super->dev_item.uuid; |
1320 | device = btrfs_find_device(root, devid, dev_uuid, | |
1321 | disk_super->fsid); | |
dfe25020 CM |
1322 | if (!device) { |
1323 | ret = -ENOENT; | |
1324 | goto error_brelse; | |
1325 | } | |
2b82032c | 1326 | } |
dfe25020 | 1327 | |
2b82032c | 1328 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
d397712b CM |
1329 | printk(KERN_ERR "btrfs: unable to remove the only writeable " |
1330 | "device\n"); | |
2b82032c YZ |
1331 | ret = -EINVAL; |
1332 | goto error_brelse; | |
1333 | } | |
1334 | ||
1335 | if (device->writeable) { | |
0c1daee0 | 1336 | lock_chunks(root); |
2b82032c | 1337 | list_del_init(&device->dev_alloc_list); |
0c1daee0 | 1338 | unlock_chunks(root); |
2b82032c | 1339 | root->fs_info->fs_devices->rw_devices--; |
1f78160c | 1340 | clear_super = true; |
dfe25020 | 1341 | } |
a061fc8d CM |
1342 | |
1343 | ret = btrfs_shrink_device(device, 0); | |
1344 | if (ret) | |
9b3517e9 | 1345 | goto error_undo; |
a061fc8d | 1346 | |
a061fc8d CM |
1347 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
1348 | if (ret) | |
9b3517e9 | 1349 | goto error_undo; |
a061fc8d | 1350 | |
2b82032c | 1351 | device->in_fs_metadata = 0; |
a2de733c | 1352 | btrfs_scrub_cancel_dev(root, device); |
e5e9a520 CM |
1353 | |
1354 | /* | |
1355 | * the device list mutex makes sure that we don't change | |
1356 | * the device list while someone else is writing out all | |
1357 | * the device supers. | |
1358 | */ | |
1f78160c XG |
1359 | |
1360 | cur_devices = device->fs_devices; | |
e5e9a520 | 1361 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
1f78160c | 1362 | list_del_rcu(&device->dev_list); |
e5e9a520 | 1363 | |
e4404d6e | 1364 | device->fs_devices->num_devices--; |
2b82032c | 1365 | |
cd02dca5 CM |
1366 | if (device->missing) |
1367 | root->fs_info->fs_devices->missing_devices--; | |
1368 | ||
2b82032c YZ |
1369 | next_device = list_entry(root->fs_info->fs_devices->devices.next, |
1370 | struct btrfs_device, dev_list); | |
1371 | if (device->bdev == root->fs_info->sb->s_bdev) | |
1372 | root->fs_info->sb->s_bdev = next_device->bdev; | |
1373 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) | |
1374 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1375 | ||
1f78160c | 1376 | if (device->bdev) |
e4404d6e | 1377 | device->fs_devices->open_devices--; |
1f78160c XG |
1378 | |
1379 | call_rcu(&device->rcu, free_device); | |
1380 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
e4404d6e | 1381 | |
2b82032c YZ |
1382 | num_devices = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
1383 | btrfs_set_super_num_devices(&root->fs_info->super_copy, num_devices); | |
1384 | ||
1f78160c | 1385 | if (cur_devices->open_devices == 0) { |
e4404d6e YZ |
1386 | struct btrfs_fs_devices *fs_devices; |
1387 | fs_devices = root->fs_info->fs_devices; | |
1388 | while (fs_devices) { | |
1f78160c | 1389 | if (fs_devices->seed == cur_devices) |
e4404d6e YZ |
1390 | break; |
1391 | fs_devices = fs_devices->seed; | |
2b82032c | 1392 | } |
1f78160c XG |
1393 | fs_devices->seed = cur_devices->seed; |
1394 | cur_devices->seed = NULL; | |
0c1daee0 | 1395 | lock_chunks(root); |
1f78160c | 1396 | __btrfs_close_devices(cur_devices); |
0c1daee0 | 1397 | unlock_chunks(root); |
1f78160c | 1398 | free_fs_devices(cur_devices); |
2b82032c YZ |
1399 | } |
1400 | ||
1401 | /* | |
1402 | * at this point, the device is zero sized. We want to | |
1403 | * remove it from the devices list and zero out the old super | |
1404 | */ | |
1f78160c | 1405 | if (clear_super) { |
dfe25020 CM |
1406 | /* make sure this device isn't detected as part of |
1407 | * the FS anymore | |
1408 | */ | |
1409 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
1410 | set_buffer_dirty(bh); | |
1411 | sync_dirty_buffer(bh); | |
dfe25020 | 1412 | } |
a061fc8d | 1413 | |
a061fc8d | 1414 | ret = 0; |
a061fc8d CM |
1415 | |
1416 | error_brelse: | |
1417 | brelse(bh); | |
1418 | error_close: | |
dfe25020 | 1419 | if (bdev) |
e525fd89 | 1420 | blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
a061fc8d | 1421 | out: |
7d9eb12c | 1422 | mutex_unlock(&root->fs_info->volume_mutex); |
a061fc8d | 1423 | mutex_unlock(&uuid_mutex); |
a061fc8d | 1424 | return ret; |
9b3517e9 ID |
1425 | error_undo: |
1426 | if (device->writeable) { | |
0c1daee0 | 1427 | lock_chunks(root); |
9b3517e9 ID |
1428 | list_add(&device->dev_alloc_list, |
1429 | &root->fs_info->fs_devices->alloc_list); | |
0c1daee0 | 1430 | unlock_chunks(root); |
9b3517e9 ID |
1431 | root->fs_info->fs_devices->rw_devices++; |
1432 | } | |
1433 | goto error_brelse; | |
a061fc8d CM |
1434 | } |
1435 | ||
2b82032c YZ |
1436 | /* |
1437 | * does all the dirty work required for changing file system's UUID. | |
1438 | */ | |
1439 | static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans, | |
1440 | struct btrfs_root *root) | |
1441 | { | |
1442 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
1443 | struct btrfs_fs_devices *old_devices; | |
e4404d6e | 1444 | struct btrfs_fs_devices *seed_devices; |
2b82032c YZ |
1445 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
1446 | struct btrfs_device *device; | |
1447 | u64 super_flags; | |
1448 | ||
1449 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 1450 | if (!fs_devices->seeding) |
2b82032c YZ |
1451 | return -EINVAL; |
1452 | ||
e4404d6e YZ |
1453 | seed_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
1454 | if (!seed_devices) | |
2b82032c YZ |
1455 | return -ENOMEM; |
1456 | ||
e4404d6e YZ |
1457 | old_devices = clone_fs_devices(fs_devices); |
1458 | if (IS_ERR(old_devices)) { | |
1459 | kfree(seed_devices); | |
1460 | return PTR_ERR(old_devices); | |
2b82032c | 1461 | } |
e4404d6e | 1462 | |
2b82032c YZ |
1463 | list_add(&old_devices->list, &fs_uuids); |
1464 | ||
e4404d6e YZ |
1465 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
1466 | seed_devices->opened = 1; | |
1467 | INIT_LIST_HEAD(&seed_devices->devices); | |
1468 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
e5e9a520 | 1469 | mutex_init(&seed_devices->device_list_mutex); |
c9513edb XG |
1470 | |
1471 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c XG |
1472 | list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices, |
1473 | synchronize_rcu); | |
c9513edb XG |
1474 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
1475 | ||
e4404d6e YZ |
1476 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); |
1477 | list_for_each_entry(device, &seed_devices->devices, dev_list) { | |
1478 | device->fs_devices = seed_devices; | |
1479 | } | |
1480 | ||
2b82032c YZ |
1481 | fs_devices->seeding = 0; |
1482 | fs_devices->num_devices = 0; | |
1483 | fs_devices->open_devices = 0; | |
e4404d6e | 1484 | fs_devices->seed = seed_devices; |
2b82032c YZ |
1485 | |
1486 | generate_random_uuid(fs_devices->fsid); | |
1487 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1488 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1489 | super_flags = btrfs_super_flags(disk_super) & | |
1490 | ~BTRFS_SUPER_FLAG_SEEDING; | |
1491 | btrfs_set_super_flags(disk_super, super_flags); | |
1492 | ||
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | /* | |
1497 | * strore the expected generation for seed devices in device items. | |
1498 | */ | |
1499 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
1500 | struct btrfs_root *root) | |
1501 | { | |
1502 | struct btrfs_path *path; | |
1503 | struct extent_buffer *leaf; | |
1504 | struct btrfs_dev_item *dev_item; | |
1505 | struct btrfs_device *device; | |
1506 | struct btrfs_key key; | |
1507 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
1508 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
1509 | u64 devid; | |
1510 | int ret; | |
1511 | ||
1512 | path = btrfs_alloc_path(); | |
1513 | if (!path) | |
1514 | return -ENOMEM; | |
1515 | ||
1516 | root = root->fs_info->chunk_root; | |
1517 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1518 | key.offset = 0; | |
1519 | key.type = BTRFS_DEV_ITEM_KEY; | |
1520 | ||
1521 | while (1) { | |
1522 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1523 | if (ret < 0) | |
1524 | goto error; | |
1525 | ||
1526 | leaf = path->nodes[0]; | |
1527 | next_slot: | |
1528 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1529 | ret = btrfs_next_leaf(root, path); | |
1530 | if (ret > 0) | |
1531 | break; | |
1532 | if (ret < 0) | |
1533 | goto error; | |
1534 | leaf = path->nodes[0]; | |
1535 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 1536 | btrfs_release_path(path); |
2b82032c YZ |
1537 | continue; |
1538 | } | |
1539 | ||
1540 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1541 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
1542 | key.type != BTRFS_DEV_ITEM_KEY) | |
1543 | break; | |
1544 | ||
1545 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
1546 | struct btrfs_dev_item); | |
1547 | devid = btrfs_device_id(leaf, dev_item); | |
1548 | read_extent_buffer(leaf, dev_uuid, | |
1549 | (unsigned long)btrfs_device_uuid(dev_item), | |
1550 | BTRFS_UUID_SIZE); | |
1551 | read_extent_buffer(leaf, fs_uuid, | |
1552 | (unsigned long)btrfs_device_fsid(dev_item), | |
1553 | BTRFS_UUID_SIZE); | |
1554 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
1555 | BUG_ON(!device); | |
1556 | ||
1557 | if (device->fs_devices->seeding) { | |
1558 | btrfs_set_device_generation(leaf, dev_item, | |
1559 | device->generation); | |
1560 | btrfs_mark_buffer_dirty(leaf); | |
1561 | } | |
1562 | ||
1563 | path->slots[0]++; | |
1564 | goto next_slot; | |
1565 | } | |
1566 | ret = 0; | |
1567 | error: | |
1568 | btrfs_free_path(path); | |
1569 | return ret; | |
1570 | } | |
1571 | ||
788f20eb CM |
1572 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
1573 | { | |
d5e2003c | 1574 | struct request_queue *q; |
788f20eb CM |
1575 | struct btrfs_trans_handle *trans; |
1576 | struct btrfs_device *device; | |
1577 | struct block_device *bdev; | |
788f20eb | 1578 | struct list_head *devices; |
2b82032c | 1579 | struct super_block *sb = root->fs_info->sb; |
788f20eb | 1580 | u64 total_bytes; |
2b82032c | 1581 | int seeding_dev = 0; |
788f20eb CM |
1582 | int ret = 0; |
1583 | ||
2b82032c YZ |
1584 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
1585 | return -EINVAL; | |
788f20eb | 1586 | |
d4d77629 TH |
1587 | bdev = blkdev_get_by_path(device_path, FMODE_EXCL, |
1588 | root->fs_info->bdev_holder); | |
7f59203a JB |
1589 | if (IS_ERR(bdev)) |
1590 | return PTR_ERR(bdev); | |
a2135011 | 1591 | |
2b82032c YZ |
1592 | if (root->fs_info->fs_devices->seeding) { |
1593 | seeding_dev = 1; | |
1594 | down_write(&sb->s_umount); | |
1595 | mutex_lock(&uuid_mutex); | |
1596 | } | |
1597 | ||
8c8bee1d | 1598 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
7d9eb12c | 1599 | mutex_lock(&root->fs_info->volume_mutex); |
a2135011 | 1600 | |
788f20eb | 1601 | devices = &root->fs_info->fs_devices->devices; |
e5e9a520 CM |
1602 | /* |
1603 | * we have the volume lock, so we don't need the extra | |
1604 | * device list mutex while reading the list here. | |
1605 | */ | |
c6e30871 | 1606 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
1607 | if (device->bdev == bdev) { |
1608 | ret = -EEXIST; | |
2b82032c | 1609 | goto error; |
788f20eb CM |
1610 | } |
1611 | } | |
1612 | ||
1613 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
1614 | if (!device) { | |
1615 | /* we can safely leave the fs_devices entry around */ | |
1616 | ret = -ENOMEM; | |
2b82032c | 1617 | goto error; |
788f20eb CM |
1618 | } |
1619 | ||
788f20eb CM |
1620 | device->name = kstrdup(device_path, GFP_NOFS); |
1621 | if (!device->name) { | |
1622 | kfree(device); | |
2b82032c YZ |
1623 | ret = -ENOMEM; |
1624 | goto error; | |
788f20eb | 1625 | } |
2b82032c YZ |
1626 | |
1627 | ret = find_next_devid(root, &device->devid); | |
1628 | if (ret) { | |
67100f25 | 1629 | kfree(device->name); |
2b82032c YZ |
1630 | kfree(device); |
1631 | goto error; | |
1632 | } | |
1633 | ||
a22285a6 | 1634 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 1635 | if (IS_ERR(trans)) { |
67100f25 | 1636 | kfree(device->name); |
98d5dc13 TI |
1637 | kfree(device); |
1638 | ret = PTR_ERR(trans); | |
1639 | goto error; | |
1640 | } | |
1641 | ||
2b82032c YZ |
1642 | lock_chunks(root); |
1643 | ||
d5e2003c JB |
1644 | q = bdev_get_queue(bdev); |
1645 | if (blk_queue_discard(q)) | |
1646 | device->can_discard = 1; | |
2b82032c YZ |
1647 | device->writeable = 1; |
1648 | device->work.func = pending_bios_fn; | |
1649 | generate_random_uuid(device->uuid); | |
1650 | spin_lock_init(&device->io_lock); | |
1651 | device->generation = trans->transid; | |
788f20eb CM |
1652 | device->io_width = root->sectorsize; |
1653 | device->io_align = root->sectorsize; | |
1654 | device->sector_size = root->sectorsize; | |
1655 | device->total_bytes = i_size_read(bdev->bd_inode); | |
2cc3c559 | 1656 | device->disk_total_bytes = device->total_bytes; |
788f20eb CM |
1657 | device->dev_root = root->fs_info->dev_root; |
1658 | device->bdev = bdev; | |
dfe25020 | 1659 | device->in_fs_metadata = 1; |
fb01aa85 | 1660 | device->mode = FMODE_EXCL; |
2b82032c | 1661 | set_blocksize(device->bdev, 4096); |
788f20eb | 1662 | |
2b82032c YZ |
1663 | if (seeding_dev) { |
1664 | sb->s_flags &= ~MS_RDONLY; | |
1665 | ret = btrfs_prepare_sprout(trans, root); | |
1666 | BUG_ON(ret); | |
1667 | } | |
788f20eb | 1668 | |
2b82032c | 1669 | device->fs_devices = root->fs_info->fs_devices; |
e5e9a520 CM |
1670 | |
1671 | /* | |
1672 | * we don't want write_supers to jump in here with our device | |
1673 | * half setup | |
1674 | */ | |
1675 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c | 1676 | list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices); |
2b82032c YZ |
1677 | list_add(&device->dev_alloc_list, |
1678 | &root->fs_info->fs_devices->alloc_list); | |
1679 | root->fs_info->fs_devices->num_devices++; | |
1680 | root->fs_info->fs_devices->open_devices++; | |
1681 | root->fs_info->fs_devices->rw_devices++; | |
d5e2003c JB |
1682 | if (device->can_discard) |
1683 | root->fs_info->fs_devices->num_can_discard++; | |
2b82032c | 1684 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; |
325cd4ba | 1685 | |
c289811c CM |
1686 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
1687 | root->fs_info->fs_devices->rotating = 1; | |
1688 | ||
788f20eb CM |
1689 | total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
1690 | btrfs_set_super_total_bytes(&root->fs_info->super_copy, | |
1691 | total_bytes + device->total_bytes); | |
1692 | ||
1693 | total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy); | |
1694 | btrfs_set_super_num_devices(&root->fs_info->super_copy, | |
1695 | total_bytes + 1); | |
e5e9a520 | 1696 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 1697 | |
2b82032c YZ |
1698 | if (seeding_dev) { |
1699 | ret = init_first_rw_device(trans, root, device); | |
1700 | BUG_ON(ret); | |
1701 | ret = btrfs_finish_sprout(trans, root); | |
1702 | BUG_ON(ret); | |
1703 | } else { | |
1704 | ret = btrfs_add_device(trans, root, device); | |
1705 | } | |
1706 | ||
913d952e CM |
1707 | /* |
1708 | * we've got more storage, clear any full flags on the space | |
1709 | * infos | |
1710 | */ | |
1711 | btrfs_clear_space_info_full(root->fs_info); | |
1712 | ||
7d9eb12c | 1713 | unlock_chunks(root); |
2b82032c | 1714 | btrfs_commit_transaction(trans, root); |
a2135011 | 1715 | |
2b82032c YZ |
1716 | if (seeding_dev) { |
1717 | mutex_unlock(&uuid_mutex); | |
1718 | up_write(&sb->s_umount); | |
788f20eb | 1719 | |
2b82032c YZ |
1720 | ret = btrfs_relocate_sys_chunks(root); |
1721 | BUG_ON(ret); | |
1722 | } | |
1723 | out: | |
1724 | mutex_unlock(&root->fs_info->volume_mutex); | |
1725 | return ret; | |
1726 | error: | |
e525fd89 | 1727 | blkdev_put(bdev, FMODE_EXCL); |
2b82032c YZ |
1728 | if (seeding_dev) { |
1729 | mutex_unlock(&uuid_mutex); | |
1730 | up_write(&sb->s_umount); | |
1731 | } | |
788f20eb CM |
1732 | goto out; |
1733 | } | |
1734 | ||
d397712b CM |
1735 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
1736 | struct btrfs_device *device) | |
0b86a832 CM |
1737 | { |
1738 | int ret; | |
1739 | struct btrfs_path *path; | |
1740 | struct btrfs_root *root; | |
1741 | struct btrfs_dev_item *dev_item; | |
1742 | struct extent_buffer *leaf; | |
1743 | struct btrfs_key key; | |
1744 | ||
1745 | root = device->dev_root->fs_info->chunk_root; | |
1746 | ||
1747 | path = btrfs_alloc_path(); | |
1748 | if (!path) | |
1749 | return -ENOMEM; | |
1750 | ||
1751 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1752 | key.type = BTRFS_DEV_ITEM_KEY; | |
1753 | key.offset = device->devid; | |
1754 | ||
1755 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1756 | if (ret < 0) | |
1757 | goto out; | |
1758 | ||
1759 | if (ret > 0) { | |
1760 | ret = -ENOENT; | |
1761 | goto out; | |
1762 | } | |
1763 | ||
1764 | leaf = path->nodes[0]; | |
1765 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1766 | ||
1767 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
1768 | btrfs_set_device_type(leaf, dev_item, device->type); | |
1769 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1770 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1771 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
d6397bae | 1772 | btrfs_set_device_total_bytes(leaf, dev_item, device->disk_total_bytes); |
0b86a832 CM |
1773 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); |
1774 | btrfs_mark_buffer_dirty(leaf); | |
1775 | ||
1776 | out: | |
1777 | btrfs_free_path(path); | |
1778 | return ret; | |
1779 | } | |
1780 | ||
7d9eb12c | 1781 | static int __btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
1782 | struct btrfs_device *device, u64 new_size) |
1783 | { | |
1784 | struct btrfs_super_block *super_copy = | |
1785 | &device->dev_root->fs_info->super_copy; | |
1786 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
1787 | u64 diff = new_size - device->total_bytes; | |
1788 | ||
2b82032c YZ |
1789 | if (!device->writeable) |
1790 | return -EACCES; | |
1791 | if (new_size <= device->total_bytes) | |
1792 | return -EINVAL; | |
1793 | ||
8f18cf13 | 1794 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
2b82032c YZ |
1795 | device->fs_devices->total_rw_bytes += diff; |
1796 | ||
1797 | device->total_bytes = new_size; | |
9779b72f | 1798 | device->disk_total_bytes = new_size; |
4184ea7f CM |
1799 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
1800 | ||
8f18cf13 CM |
1801 | return btrfs_update_device(trans, device); |
1802 | } | |
1803 | ||
7d9eb12c CM |
1804 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
1805 | struct btrfs_device *device, u64 new_size) | |
1806 | { | |
1807 | int ret; | |
1808 | lock_chunks(device->dev_root); | |
1809 | ret = __btrfs_grow_device(trans, device, new_size); | |
1810 | unlock_chunks(device->dev_root); | |
1811 | return ret; | |
1812 | } | |
1813 | ||
8f18cf13 CM |
1814 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, |
1815 | struct btrfs_root *root, | |
1816 | u64 chunk_tree, u64 chunk_objectid, | |
1817 | u64 chunk_offset) | |
1818 | { | |
1819 | int ret; | |
1820 | struct btrfs_path *path; | |
1821 | struct btrfs_key key; | |
1822 | ||
1823 | root = root->fs_info->chunk_root; | |
1824 | path = btrfs_alloc_path(); | |
1825 | if (!path) | |
1826 | return -ENOMEM; | |
1827 | ||
1828 | key.objectid = chunk_objectid; | |
1829 | key.offset = chunk_offset; | |
1830 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1831 | ||
1832 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1833 | BUG_ON(ret); | |
1834 | ||
1835 | ret = btrfs_del_item(trans, root, path); | |
8f18cf13 CM |
1836 | |
1837 | btrfs_free_path(path); | |
65a246c5 | 1838 | return ret; |
8f18cf13 CM |
1839 | } |
1840 | ||
b2950863 | 1841 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
8f18cf13 CM |
1842 | chunk_offset) |
1843 | { | |
1844 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
1845 | struct btrfs_disk_key *disk_key; | |
1846 | struct btrfs_chunk *chunk; | |
1847 | u8 *ptr; | |
1848 | int ret = 0; | |
1849 | u32 num_stripes; | |
1850 | u32 array_size; | |
1851 | u32 len = 0; | |
1852 | u32 cur; | |
1853 | struct btrfs_key key; | |
1854 | ||
1855 | array_size = btrfs_super_sys_array_size(super_copy); | |
1856 | ||
1857 | ptr = super_copy->sys_chunk_array; | |
1858 | cur = 0; | |
1859 | ||
1860 | while (cur < array_size) { | |
1861 | disk_key = (struct btrfs_disk_key *)ptr; | |
1862 | btrfs_disk_key_to_cpu(&key, disk_key); | |
1863 | ||
1864 | len = sizeof(*disk_key); | |
1865 | ||
1866 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
1867 | chunk = (struct btrfs_chunk *)(ptr + len); | |
1868 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
1869 | len += btrfs_chunk_item_size(num_stripes); | |
1870 | } else { | |
1871 | ret = -EIO; | |
1872 | break; | |
1873 | } | |
1874 | if (key.objectid == chunk_objectid && | |
1875 | key.offset == chunk_offset) { | |
1876 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
1877 | array_size -= len; | |
1878 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
1879 | } else { | |
1880 | ptr += len; | |
1881 | cur += len; | |
1882 | } | |
1883 | } | |
1884 | return ret; | |
1885 | } | |
1886 | ||
b2950863 | 1887 | static int btrfs_relocate_chunk(struct btrfs_root *root, |
8f18cf13 CM |
1888 | u64 chunk_tree, u64 chunk_objectid, |
1889 | u64 chunk_offset) | |
1890 | { | |
1891 | struct extent_map_tree *em_tree; | |
1892 | struct btrfs_root *extent_root; | |
1893 | struct btrfs_trans_handle *trans; | |
1894 | struct extent_map *em; | |
1895 | struct map_lookup *map; | |
1896 | int ret; | |
1897 | int i; | |
1898 | ||
1899 | root = root->fs_info->chunk_root; | |
1900 | extent_root = root->fs_info->extent_root; | |
1901 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
1902 | ||
ba1bf481 JB |
1903 | ret = btrfs_can_relocate(extent_root, chunk_offset); |
1904 | if (ret) | |
1905 | return -ENOSPC; | |
1906 | ||
8f18cf13 | 1907 | /* step one, relocate all the extents inside this chunk */ |
1a40e23b | 1908 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); |
a22285a6 YZ |
1909 | if (ret) |
1910 | return ret; | |
8f18cf13 | 1911 | |
a22285a6 | 1912 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 1913 | BUG_ON(IS_ERR(trans)); |
8f18cf13 | 1914 | |
7d9eb12c CM |
1915 | lock_chunks(root); |
1916 | ||
8f18cf13 CM |
1917 | /* |
1918 | * step two, delete the device extents and the | |
1919 | * chunk tree entries | |
1920 | */ | |
890871be | 1921 | read_lock(&em_tree->lock); |
8f18cf13 | 1922 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); |
890871be | 1923 | read_unlock(&em_tree->lock); |
8f18cf13 | 1924 | |
a061fc8d CM |
1925 | BUG_ON(em->start > chunk_offset || |
1926 | em->start + em->len < chunk_offset); | |
8f18cf13 CM |
1927 | map = (struct map_lookup *)em->bdev; |
1928 | ||
1929 | for (i = 0; i < map->num_stripes; i++) { | |
1930 | ret = btrfs_free_dev_extent(trans, map->stripes[i].dev, | |
1931 | map->stripes[i].physical); | |
1932 | BUG_ON(ret); | |
a061fc8d | 1933 | |
dfe25020 CM |
1934 | if (map->stripes[i].dev) { |
1935 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
1936 | BUG_ON(ret); | |
1937 | } | |
8f18cf13 CM |
1938 | } |
1939 | ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid, | |
1940 | chunk_offset); | |
1941 | ||
1942 | BUG_ON(ret); | |
1943 | ||
1abe9b8a | 1944 | trace_btrfs_chunk_free(root, map, chunk_offset, em->len); |
1945 | ||
8f18cf13 CM |
1946 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
1947 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
1948 | BUG_ON(ret); | |
8f18cf13 CM |
1949 | } |
1950 | ||
2b82032c YZ |
1951 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset); |
1952 | BUG_ON(ret); | |
1953 | ||
890871be | 1954 | write_lock(&em_tree->lock); |
2b82032c | 1955 | remove_extent_mapping(em_tree, em); |
890871be | 1956 | write_unlock(&em_tree->lock); |
2b82032c YZ |
1957 | |
1958 | kfree(map); | |
1959 | em->bdev = NULL; | |
1960 | ||
1961 | /* once for the tree */ | |
1962 | free_extent_map(em); | |
1963 | /* once for us */ | |
1964 | free_extent_map(em); | |
1965 | ||
1966 | unlock_chunks(root); | |
1967 | btrfs_end_transaction(trans, root); | |
1968 | return 0; | |
1969 | } | |
1970 | ||
1971 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) | |
1972 | { | |
1973 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; | |
1974 | struct btrfs_path *path; | |
1975 | struct extent_buffer *leaf; | |
1976 | struct btrfs_chunk *chunk; | |
1977 | struct btrfs_key key; | |
1978 | struct btrfs_key found_key; | |
1979 | u64 chunk_tree = chunk_root->root_key.objectid; | |
1980 | u64 chunk_type; | |
ba1bf481 JB |
1981 | bool retried = false; |
1982 | int failed = 0; | |
2b82032c YZ |
1983 | int ret; |
1984 | ||
1985 | path = btrfs_alloc_path(); | |
1986 | if (!path) | |
1987 | return -ENOMEM; | |
1988 | ||
ba1bf481 | 1989 | again: |
2b82032c YZ |
1990 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
1991 | key.offset = (u64)-1; | |
1992 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1993 | ||
1994 | while (1) { | |
1995 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); | |
1996 | if (ret < 0) | |
1997 | goto error; | |
1998 | BUG_ON(ret == 0); | |
1999 | ||
2000 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
2001 | key.type); | |
2002 | if (ret < 0) | |
2003 | goto error; | |
2004 | if (ret > 0) | |
2005 | break; | |
1a40e23b | 2006 | |
2b82032c YZ |
2007 | leaf = path->nodes[0]; |
2008 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 2009 | |
2b82032c YZ |
2010 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
2011 | struct btrfs_chunk); | |
2012 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
b3b4aa74 | 2013 | btrfs_release_path(path); |
8f18cf13 | 2014 | |
2b82032c YZ |
2015 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2016 | ret = btrfs_relocate_chunk(chunk_root, chunk_tree, | |
2017 | found_key.objectid, | |
2018 | found_key.offset); | |
ba1bf481 JB |
2019 | if (ret == -ENOSPC) |
2020 | failed++; | |
2021 | else if (ret) | |
2022 | BUG(); | |
2b82032c | 2023 | } |
8f18cf13 | 2024 | |
2b82032c YZ |
2025 | if (found_key.offset == 0) |
2026 | break; | |
2027 | key.offset = found_key.offset - 1; | |
2028 | } | |
2029 | ret = 0; | |
ba1bf481 JB |
2030 | if (failed && !retried) { |
2031 | failed = 0; | |
2032 | retried = true; | |
2033 | goto again; | |
2034 | } else if (failed && retried) { | |
2035 | WARN_ON(1); | |
2036 | ret = -ENOSPC; | |
2037 | } | |
2b82032c YZ |
2038 | error: |
2039 | btrfs_free_path(path); | |
2040 | return ret; | |
8f18cf13 CM |
2041 | } |
2042 | ||
ec44a35c CM |
2043 | static u64 div_factor(u64 num, int factor) |
2044 | { | |
2045 | if (factor == 10) | |
2046 | return num; | |
2047 | num *= factor; | |
2048 | do_div(num, 10); | |
2049 | return num; | |
2050 | } | |
2051 | ||
ec44a35c CM |
2052 | int btrfs_balance(struct btrfs_root *dev_root) |
2053 | { | |
2054 | int ret; | |
ec44a35c CM |
2055 | struct list_head *devices = &dev_root->fs_info->fs_devices->devices; |
2056 | struct btrfs_device *device; | |
2057 | u64 old_size; | |
2058 | u64 size_to_free; | |
2059 | struct btrfs_path *path; | |
2060 | struct btrfs_key key; | |
ec44a35c CM |
2061 | struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root; |
2062 | struct btrfs_trans_handle *trans; | |
2063 | struct btrfs_key found_key; | |
2064 | ||
2b82032c YZ |
2065 | if (dev_root->fs_info->sb->s_flags & MS_RDONLY) |
2066 | return -EROFS; | |
ec44a35c | 2067 | |
6f88a440 BH |
2068 | if (!capable(CAP_SYS_ADMIN)) |
2069 | return -EPERM; | |
2070 | ||
7d9eb12c | 2071 | mutex_lock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
2072 | dev_root = dev_root->fs_info->dev_root; |
2073 | ||
ec44a35c | 2074 | /* step one make some room on all the devices */ |
c6e30871 | 2075 | list_for_each_entry(device, devices, dev_list) { |
ec44a35c CM |
2076 | old_size = device->total_bytes; |
2077 | size_to_free = div_factor(old_size, 1); | |
2078 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
2b82032c YZ |
2079 | if (!device->writeable || |
2080 | device->total_bytes - device->bytes_used > size_to_free) | |
ec44a35c CM |
2081 | continue; |
2082 | ||
2083 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
ba1bf481 JB |
2084 | if (ret == -ENOSPC) |
2085 | break; | |
ec44a35c CM |
2086 | BUG_ON(ret); |
2087 | ||
a22285a6 | 2088 | trans = btrfs_start_transaction(dev_root, 0); |
98d5dc13 | 2089 | BUG_ON(IS_ERR(trans)); |
ec44a35c CM |
2090 | |
2091 | ret = btrfs_grow_device(trans, device, old_size); | |
2092 | BUG_ON(ret); | |
2093 | ||
2094 | btrfs_end_transaction(trans, dev_root); | |
2095 | } | |
2096 | ||
2097 | /* step two, relocate all the chunks */ | |
2098 | path = btrfs_alloc_path(); | |
17e9f796 MF |
2099 | if (!path) { |
2100 | ret = -ENOMEM; | |
2101 | goto error; | |
2102 | } | |
ec44a35c CM |
2103 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2104 | key.offset = (u64)-1; | |
2105 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2106 | ||
d397712b | 2107 | while (1) { |
ec44a35c CM |
2108 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
2109 | if (ret < 0) | |
2110 | goto error; | |
2111 | ||
2112 | /* | |
2113 | * this shouldn't happen, it means the last relocate | |
2114 | * failed | |
2115 | */ | |
2116 | if (ret == 0) | |
2117 | break; | |
2118 | ||
2119 | ret = btrfs_previous_item(chunk_root, path, 0, | |
2120 | BTRFS_CHUNK_ITEM_KEY); | |
7d9eb12c | 2121 | if (ret) |
ec44a35c | 2122 | break; |
7d9eb12c | 2123 | |
ec44a35c CM |
2124 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
2125 | path->slots[0]); | |
2126 | if (found_key.objectid != key.objectid) | |
2127 | break; | |
7d9eb12c | 2128 | |
ec44a35c | 2129 | /* chunk zero is special */ |
ba1bf481 | 2130 | if (found_key.offset == 0) |
ec44a35c CM |
2131 | break; |
2132 | ||
b3b4aa74 | 2133 | btrfs_release_path(path); |
ec44a35c CM |
2134 | ret = btrfs_relocate_chunk(chunk_root, |
2135 | chunk_root->root_key.objectid, | |
2136 | found_key.objectid, | |
2137 | found_key.offset); | |
508794eb JB |
2138 | if (ret && ret != -ENOSPC) |
2139 | goto error; | |
ba1bf481 | 2140 | key.offset = found_key.offset - 1; |
ec44a35c CM |
2141 | } |
2142 | ret = 0; | |
2143 | error: | |
2144 | btrfs_free_path(path); | |
7d9eb12c | 2145 | mutex_unlock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
2146 | return ret; |
2147 | } | |
2148 | ||
8f18cf13 CM |
2149 | /* |
2150 | * shrinking a device means finding all of the device extents past | |
2151 | * the new size, and then following the back refs to the chunks. | |
2152 | * The chunk relocation code actually frees the device extent | |
2153 | */ | |
2154 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
2155 | { | |
2156 | struct btrfs_trans_handle *trans; | |
2157 | struct btrfs_root *root = device->dev_root; | |
2158 | struct btrfs_dev_extent *dev_extent = NULL; | |
2159 | struct btrfs_path *path; | |
2160 | u64 length; | |
2161 | u64 chunk_tree; | |
2162 | u64 chunk_objectid; | |
2163 | u64 chunk_offset; | |
2164 | int ret; | |
2165 | int slot; | |
ba1bf481 JB |
2166 | int failed = 0; |
2167 | bool retried = false; | |
8f18cf13 CM |
2168 | struct extent_buffer *l; |
2169 | struct btrfs_key key; | |
2170 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
2171 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
ba1bf481 | 2172 | u64 old_size = device->total_bytes; |
8f18cf13 CM |
2173 | u64 diff = device->total_bytes - new_size; |
2174 | ||
2b82032c YZ |
2175 | if (new_size >= device->total_bytes) |
2176 | return -EINVAL; | |
8f18cf13 CM |
2177 | |
2178 | path = btrfs_alloc_path(); | |
2179 | if (!path) | |
2180 | return -ENOMEM; | |
2181 | ||
8f18cf13 CM |
2182 | path->reada = 2; |
2183 | ||
7d9eb12c CM |
2184 | lock_chunks(root); |
2185 | ||
8f18cf13 | 2186 | device->total_bytes = new_size; |
2b82032c YZ |
2187 | if (device->writeable) |
2188 | device->fs_devices->total_rw_bytes -= diff; | |
7d9eb12c | 2189 | unlock_chunks(root); |
8f18cf13 | 2190 | |
ba1bf481 | 2191 | again: |
8f18cf13 CM |
2192 | key.objectid = device->devid; |
2193 | key.offset = (u64)-1; | |
2194 | key.type = BTRFS_DEV_EXTENT_KEY; | |
2195 | ||
2196 | while (1) { | |
2197 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2198 | if (ret < 0) | |
2199 | goto done; | |
2200 | ||
2201 | ret = btrfs_previous_item(root, path, 0, key.type); | |
2202 | if (ret < 0) | |
2203 | goto done; | |
2204 | if (ret) { | |
2205 | ret = 0; | |
b3b4aa74 | 2206 | btrfs_release_path(path); |
bf1fb512 | 2207 | break; |
8f18cf13 CM |
2208 | } |
2209 | ||
2210 | l = path->nodes[0]; | |
2211 | slot = path->slots[0]; | |
2212 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
2213 | ||
ba1bf481 | 2214 | if (key.objectid != device->devid) { |
b3b4aa74 | 2215 | btrfs_release_path(path); |
bf1fb512 | 2216 | break; |
ba1bf481 | 2217 | } |
8f18cf13 CM |
2218 | |
2219 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
2220 | length = btrfs_dev_extent_length(l, dev_extent); | |
2221 | ||
ba1bf481 | 2222 | if (key.offset + length <= new_size) { |
b3b4aa74 | 2223 | btrfs_release_path(path); |
d6397bae | 2224 | break; |
ba1bf481 | 2225 | } |
8f18cf13 CM |
2226 | |
2227 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
2228 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
2229 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
b3b4aa74 | 2230 | btrfs_release_path(path); |
8f18cf13 CM |
2231 | |
2232 | ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid, | |
2233 | chunk_offset); | |
ba1bf481 | 2234 | if (ret && ret != -ENOSPC) |
8f18cf13 | 2235 | goto done; |
ba1bf481 JB |
2236 | if (ret == -ENOSPC) |
2237 | failed++; | |
2238 | key.offset -= 1; | |
2239 | } | |
2240 | ||
2241 | if (failed && !retried) { | |
2242 | failed = 0; | |
2243 | retried = true; | |
2244 | goto again; | |
2245 | } else if (failed && retried) { | |
2246 | ret = -ENOSPC; | |
2247 | lock_chunks(root); | |
2248 | ||
2249 | device->total_bytes = old_size; | |
2250 | if (device->writeable) | |
2251 | device->fs_devices->total_rw_bytes += diff; | |
2252 | unlock_chunks(root); | |
2253 | goto done; | |
8f18cf13 CM |
2254 | } |
2255 | ||
d6397bae | 2256 | /* Shrinking succeeded, else we would be at "done". */ |
a22285a6 | 2257 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
2258 | if (IS_ERR(trans)) { |
2259 | ret = PTR_ERR(trans); | |
2260 | goto done; | |
2261 | } | |
2262 | ||
d6397bae CB |
2263 | lock_chunks(root); |
2264 | ||
2265 | device->disk_total_bytes = new_size; | |
2266 | /* Now btrfs_update_device() will change the on-disk size. */ | |
2267 | ret = btrfs_update_device(trans, device); | |
2268 | if (ret) { | |
2269 | unlock_chunks(root); | |
2270 | btrfs_end_transaction(trans, root); | |
2271 | goto done; | |
2272 | } | |
2273 | WARN_ON(diff > old_total); | |
2274 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
2275 | unlock_chunks(root); | |
2276 | btrfs_end_transaction(trans, root); | |
8f18cf13 CM |
2277 | done: |
2278 | btrfs_free_path(path); | |
2279 | return ret; | |
2280 | } | |
2281 | ||
b2950863 | 2282 | static int btrfs_add_system_chunk(struct btrfs_trans_handle *trans, |
0b86a832 CM |
2283 | struct btrfs_root *root, |
2284 | struct btrfs_key *key, | |
2285 | struct btrfs_chunk *chunk, int item_size) | |
2286 | { | |
2287 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
2288 | struct btrfs_disk_key disk_key; | |
2289 | u32 array_size; | |
2290 | u8 *ptr; | |
2291 | ||
2292 | array_size = btrfs_super_sys_array_size(super_copy); | |
2293 | if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) | |
2294 | return -EFBIG; | |
2295 | ||
2296 | ptr = super_copy->sys_chunk_array + array_size; | |
2297 | btrfs_cpu_key_to_disk(&disk_key, key); | |
2298 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
2299 | ptr += sizeof(disk_key); | |
2300 | memcpy(ptr, chunk, item_size); | |
2301 | item_size += sizeof(disk_key); | |
2302 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
2303 | return 0; | |
2304 | } | |
2305 | ||
73c5de00 AJ |
2306 | /* |
2307 | * sort the devices in descending order by max_avail, total_avail | |
2308 | */ | |
2309 | static int btrfs_cmp_device_info(const void *a, const void *b) | |
9b3f68b9 | 2310 | { |
73c5de00 AJ |
2311 | const struct btrfs_device_info *di_a = a; |
2312 | const struct btrfs_device_info *di_b = b; | |
9b3f68b9 | 2313 | |
73c5de00 | 2314 | if (di_a->max_avail > di_b->max_avail) |
b2117a39 | 2315 | return -1; |
73c5de00 | 2316 | if (di_a->max_avail < di_b->max_avail) |
b2117a39 | 2317 | return 1; |
73c5de00 AJ |
2318 | if (di_a->total_avail > di_b->total_avail) |
2319 | return -1; | |
2320 | if (di_a->total_avail < di_b->total_avail) | |
2321 | return 1; | |
2322 | return 0; | |
b2117a39 | 2323 | } |
0b86a832 | 2324 | |
73c5de00 AJ |
2325 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
2326 | struct btrfs_root *extent_root, | |
2327 | struct map_lookup **map_ret, | |
2328 | u64 *num_bytes_out, u64 *stripe_size_out, | |
2329 | u64 start, u64 type) | |
b2117a39 | 2330 | { |
73c5de00 AJ |
2331 | struct btrfs_fs_info *info = extent_root->fs_info; |
2332 | struct btrfs_fs_devices *fs_devices = info->fs_devices; | |
2333 | struct list_head *cur; | |
2334 | struct map_lookup *map = NULL; | |
2335 | struct extent_map_tree *em_tree; | |
2336 | struct extent_map *em; | |
2337 | struct btrfs_device_info *devices_info = NULL; | |
2338 | u64 total_avail; | |
2339 | int num_stripes; /* total number of stripes to allocate */ | |
2340 | int sub_stripes; /* sub_stripes info for map */ | |
2341 | int dev_stripes; /* stripes per dev */ | |
2342 | int devs_max; /* max devs to use */ | |
2343 | int devs_min; /* min devs needed */ | |
2344 | int devs_increment; /* ndevs has to be a multiple of this */ | |
2345 | int ncopies; /* how many copies to data has */ | |
2346 | int ret; | |
2347 | u64 max_stripe_size; | |
2348 | u64 max_chunk_size; | |
2349 | u64 stripe_size; | |
2350 | u64 num_bytes; | |
2351 | int ndevs; | |
2352 | int i; | |
2353 | int j; | |
593060d7 | 2354 | |
73c5de00 AJ |
2355 | if ((type & BTRFS_BLOCK_GROUP_RAID1) && |
2356 | (type & BTRFS_BLOCK_GROUP_DUP)) { | |
2357 | WARN_ON(1); | |
2358 | type &= ~BTRFS_BLOCK_GROUP_DUP; | |
321aecc6 | 2359 | } |
9b3f68b9 | 2360 | |
73c5de00 AJ |
2361 | if (list_empty(&fs_devices->alloc_list)) |
2362 | return -ENOSPC; | |
b2117a39 | 2363 | |
73c5de00 AJ |
2364 | sub_stripes = 1; |
2365 | dev_stripes = 1; | |
2366 | devs_increment = 1; | |
2367 | ncopies = 1; | |
2368 | devs_max = 0; /* 0 == as many as possible */ | |
2369 | devs_min = 1; | |
2370 | ||
2371 | /* | |
2372 | * define the properties of each RAID type. | |
2373 | * FIXME: move this to a global table and use it in all RAID | |
2374 | * calculation code | |
2375 | */ | |
2376 | if (type & (BTRFS_BLOCK_GROUP_DUP)) { | |
2377 | dev_stripes = 2; | |
b2117a39 | 2378 | ncopies = 2; |
73c5de00 AJ |
2379 | devs_max = 1; |
2380 | } else if (type & (BTRFS_BLOCK_GROUP_RAID0)) { | |
2381 | devs_min = 2; | |
2382 | } else if (type & (BTRFS_BLOCK_GROUP_RAID1)) { | |
2383 | devs_increment = 2; | |
b2117a39 | 2384 | ncopies = 2; |
73c5de00 AJ |
2385 | devs_max = 2; |
2386 | devs_min = 2; | |
2387 | } else if (type & (BTRFS_BLOCK_GROUP_RAID10)) { | |
2388 | sub_stripes = 2; | |
2389 | devs_increment = 2; | |
2390 | ncopies = 2; | |
2391 | devs_min = 4; | |
2392 | } else { | |
2393 | devs_max = 1; | |
2394 | } | |
b2117a39 | 2395 | |
9b3f68b9 | 2396 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
73c5de00 AJ |
2397 | max_stripe_size = 1024 * 1024 * 1024; |
2398 | max_chunk_size = 10 * max_stripe_size; | |
9b3f68b9 | 2399 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
73c5de00 AJ |
2400 | max_stripe_size = 256 * 1024 * 1024; |
2401 | max_chunk_size = max_stripe_size; | |
a40a90a0 | 2402 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
73c5de00 AJ |
2403 | max_stripe_size = 8 * 1024 * 1024; |
2404 | max_chunk_size = 2 * max_stripe_size; | |
2405 | } else { | |
2406 | printk(KERN_ERR "btrfs: invalid chunk type 0x%llx requested\n", | |
2407 | type); | |
2408 | BUG_ON(1); | |
9b3f68b9 CM |
2409 | } |
2410 | ||
2b82032c YZ |
2411 | /* we don't want a chunk larger than 10% of writeable space */ |
2412 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
2413 | max_chunk_size); | |
9b3f68b9 | 2414 | |
73c5de00 AJ |
2415 | devices_info = kzalloc(sizeof(*devices_info) * fs_devices->rw_devices, |
2416 | GFP_NOFS); | |
2417 | if (!devices_info) | |
2418 | return -ENOMEM; | |
0cad8a11 | 2419 | |
73c5de00 | 2420 | cur = fs_devices->alloc_list.next; |
9b3f68b9 | 2421 | |
9f680ce0 | 2422 | /* |
73c5de00 AJ |
2423 | * in the first pass through the devices list, we gather information |
2424 | * about the available holes on each device. | |
9f680ce0 | 2425 | */ |
73c5de00 AJ |
2426 | ndevs = 0; |
2427 | while (cur != &fs_devices->alloc_list) { | |
2428 | struct btrfs_device *device; | |
2429 | u64 max_avail; | |
2430 | u64 dev_offset; | |
b2117a39 | 2431 | |
73c5de00 | 2432 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
9f680ce0 | 2433 | |
73c5de00 | 2434 | cur = cur->next; |
b2117a39 | 2435 | |
73c5de00 AJ |
2436 | if (!device->writeable) { |
2437 | printk(KERN_ERR | |
2438 | "btrfs: read-only device in alloc_list\n"); | |
2439 | WARN_ON(1); | |
2440 | continue; | |
2441 | } | |
b2117a39 | 2442 | |
73c5de00 AJ |
2443 | if (!device->in_fs_metadata) |
2444 | continue; | |
b2117a39 | 2445 | |
73c5de00 AJ |
2446 | if (device->total_bytes > device->bytes_used) |
2447 | total_avail = device->total_bytes - device->bytes_used; | |
2448 | else | |
2449 | total_avail = 0; | |
2450 | /* avail is off by max(alloc_start, 1MB), but that is the same | |
2451 | * for all devices, so it doesn't hurt the sorting later on | |
b2117a39 | 2452 | */ |
b2117a39 | 2453 | |
73c5de00 AJ |
2454 | ret = find_free_dev_extent(trans, device, |
2455 | max_stripe_size * dev_stripes, | |
2456 | &dev_offset, &max_avail); | |
2457 | if (ret && ret != -ENOSPC) | |
2458 | goto error; | |
b2117a39 | 2459 | |
73c5de00 AJ |
2460 | if (ret == 0) |
2461 | max_avail = max_stripe_size * dev_stripes; | |
b2117a39 | 2462 | |
73c5de00 AJ |
2463 | if (max_avail < BTRFS_STRIPE_LEN * dev_stripes) |
2464 | continue; | |
b2117a39 | 2465 | |
73c5de00 AJ |
2466 | devices_info[ndevs].dev_offset = dev_offset; |
2467 | devices_info[ndevs].max_avail = max_avail; | |
2468 | devices_info[ndevs].total_avail = total_avail; | |
2469 | devices_info[ndevs].dev = device; | |
2470 | ++ndevs; | |
2471 | } | |
b2117a39 | 2472 | |
73c5de00 AJ |
2473 | /* |
2474 | * now sort the devices by hole size / available space | |
2475 | */ | |
2476 | sort(devices_info, ndevs, sizeof(struct btrfs_device_info), | |
2477 | btrfs_cmp_device_info, NULL); | |
b2117a39 | 2478 | |
73c5de00 AJ |
2479 | /* round down to number of usable stripes */ |
2480 | ndevs -= ndevs % devs_increment; | |
b2117a39 | 2481 | |
73c5de00 AJ |
2482 | if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) { |
2483 | ret = -ENOSPC; | |
2484 | goto error; | |
b2117a39 | 2485 | } |
9f680ce0 | 2486 | |
73c5de00 AJ |
2487 | if (devs_max && ndevs > devs_max) |
2488 | ndevs = devs_max; | |
2489 | /* | |
2490 | * the primary goal is to maximize the number of stripes, so use as many | |
2491 | * devices as possible, even if the stripes are not maximum sized. | |
2492 | */ | |
2493 | stripe_size = devices_info[ndevs-1].max_avail; | |
2494 | num_stripes = ndevs * dev_stripes; | |
b2117a39 | 2495 | |
73c5de00 AJ |
2496 | if (stripe_size * num_stripes > max_chunk_size * ncopies) { |
2497 | stripe_size = max_chunk_size * ncopies; | |
2498 | do_div(stripe_size, num_stripes); | |
b2117a39 | 2499 | } |
b2117a39 | 2500 | |
73c5de00 AJ |
2501 | do_div(stripe_size, dev_stripes); |
2502 | do_div(stripe_size, BTRFS_STRIPE_LEN); | |
2503 | stripe_size *= BTRFS_STRIPE_LEN; | |
b2117a39 MX |
2504 | |
2505 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
2506 | if (!map) { | |
2507 | ret = -ENOMEM; | |
2508 | goto error; | |
2509 | } | |
2510 | map->num_stripes = num_stripes; | |
9b3f68b9 | 2511 | |
73c5de00 AJ |
2512 | for (i = 0; i < ndevs; ++i) { |
2513 | for (j = 0; j < dev_stripes; ++j) { | |
2514 | int s = i * dev_stripes + j; | |
2515 | map->stripes[s].dev = devices_info[i].dev; | |
2516 | map->stripes[s].physical = devices_info[i].dev_offset + | |
2517 | j * stripe_size; | |
6324fbf3 | 2518 | } |
6324fbf3 | 2519 | } |
2b82032c | 2520 | map->sector_size = extent_root->sectorsize; |
b2117a39 MX |
2521 | map->stripe_len = BTRFS_STRIPE_LEN; |
2522 | map->io_align = BTRFS_STRIPE_LEN; | |
2523 | map->io_width = BTRFS_STRIPE_LEN; | |
2b82032c | 2524 | map->type = type; |
2b82032c | 2525 | map->sub_stripes = sub_stripes; |
0b86a832 | 2526 | |
2b82032c | 2527 | *map_ret = map; |
73c5de00 | 2528 | num_bytes = stripe_size * (num_stripes / ncopies); |
0b86a832 | 2529 | |
73c5de00 AJ |
2530 | *stripe_size_out = stripe_size; |
2531 | *num_bytes_out = num_bytes; | |
0b86a832 | 2532 | |
73c5de00 | 2533 | trace_btrfs_chunk_alloc(info->chunk_root, map, start, num_bytes); |
1abe9b8a | 2534 | |
172ddd60 | 2535 | em = alloc_extent_map(); |
2b82032c | 2536 | if (!em) { |
b2117a39 MX |
2537 | ret = -ENOMEM; |
2538 | goto error; | |
593060d7 | 2539 | } |
2b82032c YZ |
2540 | em->bdev = (struct block_device *)map; |
2541 | em->start = start; | |
73c5de00 | 2542 | em->len = num_bytes; |
2b82032c YZ |
2543 | em->block_start = 0; |
2544 | em->block_len = em->len; | |
593060d7 | 2545 | |
2b82032c | 2546 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
890871be | 2547 | write_lock(&em_tree->lock); |
2b82032c | 2548 | ret = add_extent_mapping(em_tree, em); |
890871be | 2549 | write_unlock(&em_tree->lock); |
2b82032c YZ |
2550 | BUG_ON(ret); |
2551 | free_extent_map(em); | |
0b86a832 | 2552 | |
2b82032c YZ |
2553 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
2554 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
73c5de00 | 2555 | start, num_bytes); |
2b82032c | 2556 | BUG_ON(ret); |
611f0e00 | 2557 | |
73c5de00 AJ |
2558 | for (i = 0; i < map->num_stripes; ++i) { |
2559 | struct btrfs_device *device; | |
2560 | u64 dev_offset; | |
2561 | ||
2562 | device = map->stripes[i].dev; | |
2563 | dev_offset = map->stripes[i].physical; | |
0b86a832 CM |
2564 | |
2565 | ret = btrfs_alloc_dev_extent(trans, device, | |
2b82032c YZ |
2566 | info->chunk_root->root_key.objectid, |
2567 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
73c5de00 | 2568 | start, dev_offset, stripe_size); |
0b86a832 | 2569 | BUG_ON(ret); |
2b82032c YZ |
2570 | } |
2571 | ||
b2117a39 | 2572 | kfree(devices_info); |
2b82032c | 2573 | return 0; |
b2117a39 MX |
2574 | |
2575 | error: | |
2576 | kfree(map); | |
2577 | kfree(devices_info); | |
2578 | return ret; | |
2b82032c YZ |
2579 | } |
2580 | ||
2581 | static int __finish_chunk_alloc(struct btrfs_trans_handle *trans, | |
2582 | struct btrfs_root *extent_root, | |
2583 | struct map_lookup *map, u64 chunk_offset, | |
2584 | u64 chunk_size, u64 stripe_size) | |
2585 | { | |
2586 | u64 dev_offset; | |
2587 | struct btrfs_key key; | |
2588 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2589 | struct btrfs_device *device; | |
2590 | struct btrfs_chunk *chunk; | |
2591 | struct btrfs_stripe *stripe; | |
2592 | size_t item_size = btrfs_chunk_item_size(map->num_stripes); | |
2593 | int index = 0; | |
2594 | int ret; | |
2595 | ||
2596 | chunk = kzalloc(item_size, GFP_NOFS); | |
2597 | if (!chunk) | |
2598 | return -ENOMEM; | |
2599 | ||
2600 | index = 0; | |
2601 | while (index < map->num_stripes) { | |
2602 | device = map->stripes[index].dev; | |
2603 | device->bytes_used += stripe_size; | |
0b86a832 CM |
2604 | ret = btrfs_update_device(trans, device); |
2605 | BUG_ON(ret); | |
2b82032c YZ |
2606 | index++; |
2607 | } | |
2608 | ||
2609 | index = 0; | |
2610 | stripe = &chunk->stripe; | |
2611 | while (index < map->num_stripes) { | |
2612 | device = map->stripes[index].dev; | |
2613 | dev_offset = map->stripes[index].physical; | |
0b86a832 | 2614 | |
e17cade2 CM |
2615 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
2616 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
2617 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 2618 | stripe++; |
0b86a832 CM |
2619 | index++; |
2620 | } | |
2621 | ||
2b82032c | 2622 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 2623 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
2624 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
2625 | btrfs_set_stack_chunk_type(chunk, map->type); | |
2626 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
2627 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
2628 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b86a832 | 2629 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
2b82032c | 2630 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 2631 | |
2b82032c YZ |
2632 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2633 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2634 | key.offset = chunk_offset; | |
0b86a832 | 2635 | |
2b82032c YZ |
2636 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
2637 | BUG_ON(ret); | |
0b86a832 | 2638 | |
2b82032c YZ |
2639 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2640 | ret = btrfs_add_system_chunk(trans, chunk_root, &key, chunk, | |
2641 | item_size); | |
8f18cf13 CM |
2642 | BUG_ON(ret); |
2643 | } | |
1abe9b8a | 2644 | |
0b86a832 | 2645 | kfree(chunk); |
2b82032c YZ |
2646 | return 0; |
2647 | } | |
0b86a832 | 2648 | |
2b82032c YZ |
2649 | /* |
2650 | * Chunk allocation falls into two parts. The first part does works | |
2651 | * that make the new allocated chunk useable, but not do any operation | |
2652 | * that modifies the chunk tree. The second part does the works that | |
2653 | * require modifying the chunk tree. This division is important for the | |
2654 | * bootstrap process of adding storage to a seed btrfs. | |
2655 | */ | |
2656 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2657 | struct btrfs_root *extent_root, u64 type) | |
2658 | { | |
2659 | u64 chunk_offset; | |
2660 | u64 chunk_size; | |
2661 | u64 stripe_size; | |
2662 | struct map_lookup *map; | |
2663 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2664 | int ret; | |
2665 | ||
2666 | ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
2667 | &chunk_offset); | |
2668 | if (ret) | |
2669 | return ret; | |
2670 | ||
2671 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2672 | &stripe_size, chunk_offset, type); | |
2673 | if (ret) | |
2674 | return ret; | |
2675 | ||
2676 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2677 | chunk_size, stripe_size); | |
2678 | BUG_ON(ret); | |
2679 | return 0; | |
2680 | } | |
2681 | ||
d397712b | 2682 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
2b82032c YZ |
2683 | struct btrfs_root *root, |
2684 | struct btrfs_device *device) | |
2685 | { | |
2686 | u64 chunk_offset; | |
2687 | u64 sys_chunk_offset; | |
2688 | u64 chunk_size; | |
2689 | u64 sys_chunk_size; | |
2690 | u64 stripe_size; | |
2691 | u64 sys_stripe_size; | |
2692 | u64 alloc_profile; | |
2693 | struct map_lookup *map; | |
2694 | struct map_lookup *sys_map; | |
2695 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2696 | struct btrfs_root *extent_root = fs_info->extent_root; | |
2697 | int ret; | |
2698 | ||
2699 | ret = find_next_chunk(fs_info->chunk_root, | |
2700 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset); | |
92b8e897 MF |
2701 | if (ret) |
2702 | return ret; | |
2b82032c YZ |
2703 | |
2704 | alloc_profile = BTRFS_BLOCK_GROUP_METADATA | | |
2705 | (fs_info->metadata_alloc_profile & | |
2706 | fs_info->avail_metadata_alloc_bits); | |
2707 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2708 | ||
2709 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2710 | &stripe_size, chunk_offset, alloc_profile); | |
2711 | BUG_ON(ret); | |
2712 | ||
2713 | sys_chunk_offset = chunk_offset + chunk_size; | |
2714 | ||
2715 | alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM | | |
2716 | (fs_info->system_alloc_profile & | |
2717 | fs_info->avail_system_alloc_bits); | |
2718 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2719 | ||
2720 | ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map, | |
2721 | &sys_chunk_size, &sys_stripe_size, | |
2722 | sys_chunk_offset, alloc_profile); | |
2723 | BUG_ON(ret); | |
2724 | ||
2725 | ret = btrfs_add_device(trans, fs_info->chunk_root, device); | |
2726 | BUG_ON(ret); | |
2727 | ||
2728 | /* | |
2729 | * Modifying chunk tree needs allocating new blocks from both | |
2730 | * system block group and metadata block group. So we only can | |
2731 | * do operations require modifying the chunk tree after both | |
2732 | * block groups were created. | |
2733 | */ | |
2734 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2735 | chunk_size, stripe_size); | |
2736 | BUG_ON(ret); | |
2737 | ||
2738 | ret = __finish_chunk_alloc(trans, extent_root, sys_map, | |
2739 | sys_chunk_offset, sys_chunk_size, | |
2740 | sys_stripe_size); | |
b248a415 | 2741 | BUG_ON(ret); |
2b82032c YZ |
2742 | return 0; |
2743 | } | |
2744 | ||
2745 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) | |
2746 | { | |
2747 | struct extent_map *em; | |
2748 | struct map_lookup *map; | |
2749 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
2750 | int readonly = 0; | |
2751 | int i; | |
2752 | ||
890871be | 2753 | read_lock(&map_tree->map_tree.lock); |
2b82032c | 2754 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
890871be | 2755 | read_unlock(&map_tree->map_tree.lock); |
2b82032c YZ |
2756 | if (!em) |
2757 | return 1; | |
2758 | ||
f48b9075 JB |
2759 | if (btrfs_test_opt(root, DEGRADED)) { |
2760 | free_extent_map(em); | |
2761 | return 0; | |
2762 | } | |
2763 | ||
2b82032c YZ |
2764 | map = (struct map_lookup *)em->bdev; |
2765 | for (i = 0; i < map->num_stripes; i++) { | |
2766 | if (!map->stripes[i].dev->writeable) { | |
2767 | readonly = 1; | |
2768 | break; | |
2769 | } | |
2770 | } | |
0b86a832 | 2771 | free_extent_map(em); |
2b82032c | 2772 | return readonly; |
0b86a832 CM |
2773 | } |
2774 | ||
2775 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
2776 | { | |
a8067e02 | 2777 | extent_map_tree_init(&tree->map_tree); |
0b86a832 CM |
2778 | } |
2779 | ||
2780 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
2781 | { | |
2782 | struct extent_map *em; | |
2783 | ||
d397712b | 2784 | while (1) { |
890871be | 2785 | write_lock(&tree->map_tree.lock); |
0b86a832 CM |
2786 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
2787 | if (em) | |
2788 | remove_extent_mapping(&tree->map_tree, em); | |
890871be | 2789 | write_unlock(&tree->map_tree.lock); |
0b86a832 CM |
2790 | if (!em) |
2791 | break; | |
2792 | kfree(em->bdev); | |
2793 | /* once for us */ | |
2794 | free_extent_map(em); | |
2795 | /* once for the tree */ | |
2796 | free_extent_map(em); | |
2797 | } | |
2798 | } | |
2799 | ||
f188591e CM |
2800 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len) |
2801 | { | |
2802 | struct extent_map *em; | |
2803 | struct map_lookup *map; | |
2804 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2805 | int ret; | |
2806 | ||
890871be | 2807 | read_lock(&em_tree->lock); |
f188591e | 2808 | em = lookup_extent_mapping(em_tree, logical, len); |
890871be | 2809 | read_unlock(&em_tree->lock); |
f188591e CM |
2810 | BUG_ON(!em); |
2811 | ||
2812 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2813 | map = (struct map_lookup *)em->bdev; | |
2814 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
2815 | ret = map->num_stripes; | |
321aecc6 CM |
2816 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
2817 | ret = map->sub_stripes; | |
f188591e CM |
2818 | else |
2819 | ret = 1; | |
2820 | free_extent_map(em); | |
f188591e CM |
2821 | return ret; |
2822 | } | |
2823 | ||
dfe25020 CM |
2824 | static int find_live_mirror(struct map_lookup *map, int first, int num, |
2825 | int optimal) | |
2826 | { | |
2827 | int i; | |
2828 | if (map->stripes[optimal].dev->bdev) | |
2829 | return optimal; | |
2830 | for (i = first; i < first + num; i++) { | |
2831 | if (map->stripes[i].dev->bdev) | |
2832 | return i; | |
2833 | } | |
2834 | /* we couldn't find one that doesn't fail. Just return something | |
2835 | * and the io error handling code will clean up eventually | |
2836 | */ | |
2837 | return optimal; | |
2838 | } | |
2839 | ||
f2d8d74d CM |
2840 | static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
2841 | u64 logical, u64 *length, | |
2842 | struct btrfs_multi_bio **multi_ret, | |
7eaceacc | 2843 | int mirror_num) |
0b86a832 CM |
2844 | { |
2845 | struct extent_map *em; | |
2846 | struct map_lookup *map; | |
2847 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2848 | u64 offset; | |
593060d7 | 2849 | u64 stripe_offset; |
fce3bb9a | 2850 | u64 stripe_end_offset; |
593060d7 | 2851 | u64 stripe_nr; |
fce3bb9a LD |
2852 | u64 stripe_nr_orig; |
2853 | u64 stripe_nr_end; | |
cea9e445 | 2854 | int stripes_allocated = 8; |
321aecc6 | 2855 | int stripes_required = 1; |
593060d7 | 2856 | int stripe_index; |
cea9e445 | 2857 | int i; |
f2d8d74d | 2858 | int num_stripes; |
a236aed1 | 2859 | int max_errors = 0; |
cea9e445 | 2860 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 2861 | |
fce3bb9a | 2862 | if (multi_ret && !(rw & (REQ_WRITE | REQ_DISCARD))) |
cea9e445 | 2863 | stripes_allocated = 1; |
cea9e445 CM |
2864 | again: |
2865 | if (multi_ret) { | |
2866 | multi = kzalloc(btrfs_multi_bio_size(stripes_allocated), | |
2867 | GFP_NOFS); | |
2868 | if (!multi) | |
2869 | return -ENOMEM; | |
a236aed1 CM |
2870 | |
2871 | atomic_set(&multi->error, 0); | |
cea9e445 | 2872 | } |
0b86a832 | 2873 | |
890871be | 2874 | read_lock(&em_tree->lock); |
0b86a832 | 2875 | em = lookup_extent_mapping(em_tree, logical, *length); |
890871be | 2876 | read_unlock(&em_tree->lock); |
f2d8d74d | 2877 | |
3b951516 | 2878 | if (!em) { |
d397712b CM |
2879 | printk(KERN_CRIT "unable to find logical %llu len %llu\n", |
2880 | (unsigned long long)logical, | |
2881 | (unsigned long long)*length); | |
f2d8d74d | 2882 | BUG(); |
3b951516 | 2883 | } |
0b86a832 CM |
2884 | |
2885 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2886 | map = (struct map_lookup *)em->bdev; | |
2887 | offset = logical - em->start; | |
593060d7 | 2888 | |
f188591e CM |
2889 | if (mirror_num > map->num_stripes) |
2890 | mirror_num = 0; | |
2891 | ||
cea9e445 | 2892 | /* if our multi bio struct is too small, back off and try again */ |
7b6d91da | 2893 | if (rw & REQ_WRITE) { |
321aecc6 CM |
2894 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | |
2895 | BTRFS_BLOCK_GROUP_DUP)) { | |
2896 | stripes_required = map->num_stripes; | |
a236aed1 | 2897 | max_errors = 1; |
321aecc6 CM |
2898 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2899 | stripes_required = map->sub_stripes; | |
a236aed1 | 2900 | max_errors = 1; |
321aecc6 CM |
2901 | } |
2902 | } | |
fce3bb9a LD |
2903 | if (rw & REQ_DISCARD) { |
2904 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | | |
2905 | BTRFS_BLOCK_GROUP_RAID1 | | |
2906 | BTRFS_BLOCK_GROUP_DUP | | |
2907 | BTRFS_BLOCK_GROUP_RAID10)) { | |
2908 | stripes_required = map->num_stripes; | |
2909 | } | |
2910 | } | |
2911 | if (multi_ret && (rw & (REQ_WRITE | REQ_DISCARD)) && | |
321aecc6 | 2912 | stripes_allocated < stripes_required) { |
cea9e445 | 2913 | stripes_allocated = map->num_stripes; |
cea9e445 CM |
2914 | free_extent_map(em); |
2915 | kfree(multi); | |
2916 | goto again; | |
2917 | } | |
593060d7 CM |
2918 | stripe_nr = offset; |
2919 | /* | |
2920 | * stripe_nr counts the total number of stripes we have to stride | |
2921 | * to get to this block | |
2922 | */ | |
2923 | do_div(stripe_nr, map->stripe_len); | |
2924 | ||
2925 | stripe_offset = stripe_nr * map->stripe_len; | |
2926 | BUG_ON(offset < stripe_offset); | |
2927 | ||
2928 | /* stripe_offset is the offset of this block in its stripe*/ | |
2929 | stripe_offset = offset - stripe_offset; | |
2930 | ||
fce3bb9a LD |
2931 | if (rw & REQ_DISCARD) |
2932 | *length = min_t(u64, em->len - offset, *length); | |
2933 | else if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | | |
2934 | BTRFS_BLOCK_GROUP_RAID1 | | |
2935 | BTRFS_BLOCK_GROUP_RAID10 | | |
2936 | BTRFS_BLOCK_GROUP_DUP)) { | |
cea9e445 CM |
2937 | /* we limit the length of each bio to what fits in a stripe */ |
2938 | *length = min_t(u64, em->len - offset, | |
fce3bb9a | 2939 | map->stripe_len - stripe_offset); |
cea9e445 CM |
2940 | } else { |
2941 | *length = em->len - offset; | |
2942 | } | |
f2d8d74d | 2943 | |
7eaceacc | 2944 | if (!multi_ret) |
cea9e445 CM |
2945 | goto out; |
2946 | ||
f2d8d74d | 2947 | num_stripes = 1; |
cea9e445 | 2948 | stripe_index = 0; |
fce3bb9a LD |
2949 | stripe_nr_orig = stripe_nr; |
2950 | stripe_nr_end = (offset + *length + map->stripe_len - 1) & | |
2951 | (~(map->stripe_len - 1)); | |
2952 | do_div(stripe_nr_end, map->stripe_len); | |
2953 | stripe_end_offset = stripe_nr_end * map->stripe_len - | |
2954 | (offset + *length); | |
2955 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
2956 | if (rw & REQ_DISCARD) | |
2957 | num_stripes = min_t(u64, map->num_stripes, | |
2958 | stripe_nr_end - stripe_nr_orig); | |
2959 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
2960 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { | |
212a17ab | 2961 | if (rw & (REQ_WRITE | REQ_DISCARD)) |
f2d8d74d | 2962 | num_stripes = map->num_stripes; |
2fff734f | 2963 | else if (mirror_num) |
f188591e | 2964 | stripe_index = mirror_num - 1; |
dfe25020 CM |
2965 | else { |
2966 | stripe_index = find_live_mirror(map, 0, | |
2967 | map->num_stripes, | |
2968 | current->pid % map->num_stripes); | |
2969 | } | |
2fff734f | 2970 | |
611f0e00 | 2971 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
fce3bb9a | 2972 | if (rw & (REQ_WRITE | REQ_DISCARD)) |
f2d8d74d | 2973 | num_stripes = map->num_stripes; |
f188591e CM |
2974 | else if (mirror_num) |
2975 | stripe_index = mirror_num - 1; | |
2fff734f | 2976 | |
321aecc6 CM |
2977 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2978 | int factor = map->num_stripes / map->sub_stripes; | |
321aecc6 CM |
2979 | |
2980 | stripe_index = do_div(stripe_nr, factor); | |
2981 | stripe_index *= map->sub_stripes; | |
2982 | ||
7eaceacc | 2983 | if (rw & REQ_WRITE) |
f2d8d74d | 2984 | num_stripes = map->sub_stripes; |
fce3bb9a LD |
2985 | else if (rw & REQ_DISCARD) |
2986 | num_stripes = min_t(u64, map->sub_stripes * | |
2987 | (stripe_nr_end - stripe_nr_orig), | |
2988 | map->num_stripes); | |
321aecc6 CM |
2989 | else if (mirror_num) |
2990 | stripe_index += mirror_num - 1; | |
dfe25020 CM |
2991 | else { |
2992 | stripe_index = find_live_mirror(map, stripe_index, | |
2993 | map->sub_stripes, stripe_index + | |
2994 | current->pid % map->sub_stripes); | |
2995 | } | |
8790d502 CM |
2996 | } else { |
2997 | /* | |
2998 | * after this do_div call, stripe_nr is the number of stripes | |
2999 | * on this device we have to walk to find the data, and | |
3000 | * stripe_index is the number of our device in the stripe array | |
3001 | */ | |
3002 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
3003 | } | |
593060d7 | 3004 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 3005 | |
fce3bb9a LD |
3006 | if (rw & REQ_DISCARD) { |
3007 | for (i = 0; i < num_stripes; i++) { | |
f2d8d74d CM |
3008 | multi->stripes[i].physical = |
3009 | map->stripes[stripe_index].physical + | |
3010 | stripe_offset + stripe_nr * map->stripe_len; | |
3011 | multi->stripes[i].dev = map->stripes[stripe_index].dev; | |
fce3bb9a LD |
3012 | |
3013 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3014 | u64 stripes; | |
d9d04879 | 3015 | u32 last_stripe = 0; |
fce3bb9a LD |
3016 | int j; |
3017 | ||
d9d04879 CM |
3018 | div_u64_rem(stripe_nr_end - 1, |
3019 | map->num_stripes, | |
3020 | &last_stripe); | |
3021 | ||
fce3bb9a | 3022 | for (j = 0; j < map->num_stripes; j++) { |
d9d04879 CM |
3023 | u32 test; |
3024 | ||
3025 | div_u64_rem(stripe_nr_end - 1 - j, | |
3026 | map->num_stripes, &test); | |
3027 | if (test == stripe_index) | |
fce3bb9a LD |
3028 | break; |
3029 | } | |
3030 | stripes = stripe_nr_end - 1 - j; | |
3031 | do_div(stripes, map->num_stripes); | |
3032 | multi->stripes[i].length = map->stripe_len * | |
3033 | (stripes - stripe_nr + 1); | |
3034 | ||
3035 | if (i == 0) { | |
3036 | multi->stripes[i].length -= | |
3037 | stripe_offset; | |
3038 | stripe_offset = 0; | |
3039 | } | |
3040 | if (stripe_index == last_stripe) | |
3041 | multi->stripes[i].length -= | |
3042 | stripe_end_offset; | |
3043 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
3044 | u64 stripes; | |
3045 | int j; | |
3046 | int factor = map->num_stripes / | |
3047 | map->sub_stripes; | |
d9d04879 CM |
3048 | u32 last_stripe = 0; |
3049 | ||
3050 | div_u64_rem(stripe_nr_end - 1, | |
3051 | factor, &last_stripe); | |
fce3bb9a LD |
3052 | last_stripe *= map->sub_stripes; |
3053 | ||
3054 | for (j = 0; j < factor; j++) { | |
d9d04879 CM |
3055 | u32 test; |
3056 | ||
3057 | div_u64_rem(stripe_nr_end - 1 - j, | |
3058 | factor, &test); | |
3059 | ||
3060 | if (test == | |
fce3bb9a LD |
3061 | stripe_index / map->sub_stripes) |
3062 | break; | |
3063 | } | |
3064 | stripes = stripe_nr_end - 1 - j; | |
3065 | do_div(stripes, factor); | |
3066 | multi->stripes[i].length = map->stripe_len * | |
3067 | (stripes - stripe_nr + 1); | |
3068 | ||
3069 | if (i < map->sub_stripes) { | |
3070 | multi->stripes[i].length -= | |
3071 | stripe_offset; | |
3072 | if (i == map->sub_stripes - 1) | |
3073 | stripe_offset = 0; | |
3074 | } | |
3075 | if (stripe_index >= last_stripe && | |
3076 | stripe_index <= (last_stripe + | |
3077 | map->sub_stripes - 1)) { | |
3078 | multi->stripes[i].length -= | |
3079 | stripe_end_offset; | |
3080 | } | |
3081 | } else | |
3082 | multi->stripes[i].length = *length; | |
3083 | ||
3084 | stripe_index++; | |
3085 | if (stripe_index == map->num_stripes) { | |
3086 | /* This could only happen for RAID0/10 */ | |
3087 | stripe_index = 0; | |
3088 | stripe_nr++; | |
3089 | } | |
3090 | } | |
3091 | } else { | |
3092 | for (i = 0; i < num_stripes; i++) { | |
212a17ab LT |
3093 | multi->stripes[i].physical = |
3094 | map->stripes[stripe_index].physical + | |
3095 | stripe_offset + | |
3096 | stripe_nr * map->stripe_len; | |
3097 | multi->stripes[i].dev = | |
3098 | map->stripes[stripe_index].dev; | |
fce3bb9a | 3099 | stripe_index++; |
f2d8d74d | 3100 | } |
593060d7 | 3101 | } |
f2d8d74d CM |
3102 | if (multi_ret) { |
3103 | *multi_ret = multi; | |
3104 | multi->num_stripes = num_stripes; | |
a236aed1 | 3105 | multi->max_errors = max_errors; |
f2d8d74d | 3106 | } |
cea9e445 | 3107 | out: |
0b86a832 | 3108 | free_extent_map(em); |
0b86a832 CM |
3109 | return 0; |
3110 | } | |
3111 | ||
f2d8d74d CM |
3112 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
3113 | u64 logical, u64 *length, | |
3114 | struct btrfs_multi_bio **multi_ret, int mirror_num) | |
3115 | { | |
3116 | return __btrfs_map_block(map_tree, rw, logical, length, multi_ret, | |
7eaceacc | 3117 | mirror_num); |
f2d8d74d CM |
3118 | } |
3119 | ||
a512bbf8 YZ |
3120 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
3121 | u64 chunk_start, u64 physical, u64 devid, | |
3122 | u64 **logical, int *naddrs, int *stripe_len) | |
3123 | { | |
3124 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
3125 | struct extent_map *em; | |
3126 | struct map_lookup *map; | |
3127 | u64 *buf; | |
3128 | u64 bytenr; | |
3129 | u64 length; | |
3130 | u64 stripe_nr; | |
3131 | int i, j, nr = 0; | |
3132 | ||
890871be | 3133 | read_lock(&em_tree->lock); |
a512bbf8 | 3134 | em = lookup_extent_mapping(em_tree, chunk_start, 1); |
890871be | 3135 | read_unlock(&em_tree->lock); |
a512bbf8 YZ |
3136 | |
3137 | BUG_ON(!em || em->start != chunk_start); | |
3138 | map = (struct map_lookup *)em->bdev; | |
3139 | ||
3140 | length = em->len; | |
3141 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) | |
3142 | do_div(length, map->num_stripes / map->sub_stripes); | |
3143 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
3144 | do_div(length, map->num_stripes); | |
3145 | ||
3146 | buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); | |
3147 | BUG_ON(!buf); | |
3148 | ||
3149 | for (i = 0; i < map->num_stripes; i++) { | |
3150 | if (devid && map->stripes[i].dev->devid != devid) | |
3151 | continue; | |
3152 | if (map->stripes[i].physical > physical || | |
3153 | map->stripes[i].physical + length <= physical) | |
3154 | continue; | |
3155 | ||
3156 | stripe_nr = physical - map->stripes[i].physical; | |
3157 | do_div(stripe_nr, map->stripe_len); | |
3158 | ||
3159 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
3160 | stripe_nr = stripe_nr * map->num_stripes + i; | |
3161 | do_div(stripe_nr, map->sub_stripes); | |
3162 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3163 | stripe_nr = stripe_nr * map->num_stripes + i; | |
3164 | } | |
3165 | bytenr = chunk_start + stripe_nr * map->stripe_len; | |
934d375b | 3166 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
3167 | for (j = 0; j < nr; j++) { |
3168 | if (buf[j] == bytenr) | |
3169 | break; | |
3170 | } | |
934d375b CM |
3171 | if (j == nr) { |
3172 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 3173 | buf[nr++] = bytenr; |
934d375b | 3174 | } |
a512bbf8 YZ |
3175 | } |
3176 | ||
a512bbf8 YZ |
3177 | *logical = buf; |
3178 | *naddrs = nr; | |
3179 | *stripe_len = map->stripe_len; | |
3180 | ||
3181 | free_extent_map(em); | |
3182 | return 0; | |
f2d8d74d CM |
3183 | } |
3184 | ||
8790d502 | 3185 | static void end_bio_multi_stripe(struct bio *bio, int err) |
8790d502 | 3186 | { |
cea9e445 | 3187 | struct btrfs_multi_bio *multi = bio->bi_private; |
7d2b4daa | 3188 | int is_orig_bio = 0; |
8790d502 | 3189 | |
8790d502 | 3190 | if (err) |
a236aed1 | 3191 | atomic_inc(&multi->error); |
8790d502 | 3192 | |
7d2b4daa CM |
3193 | if (bio == multi->orig_bio) |
3194 | is_orig_bio = 1; | |
3195 | ||
cea9e445 | 3196 | if (atomic_dec_and_test(&multi->stripes_pending)) { |
7d2b4daa CM |
3197 | if (!is_orig_bio) { |
3198 | bio_put(bio); | |
3199 | bio = multi->orig_bio; | |
3200 | } | |
8790d502 CM |
3201 | bio->bi_private = multi->private; |
3202 | bio->bi_end_io = multi->end_io; | |
a236aed1 CM |
3203 | /* only send an error to the higher layers if it is |
3204 | * beyond the tolerance of the multi-bio | |
3205 | */ | |
1259ab75 | 3206 | if (atomic_read(&multi->error) > multi->max_errors) { |
a236aed1 | 3207 | err = -EIO; |
1259ab75 CM |
3208 | } else if (err) { |
3209 | /* | |
3210 | * this bio is actually up to date, we didn't | |
3211 | * go over the max number of errors | |
3212 | */ | |
3213 | set_bit(BIO_UPTODATE, &bio->bi_flags); | |
a236aed1 | 3214 | err = 0; |
1259ab75 | 3215 | } |
8790d502 CM |
3216 | kfree(multi); |
3217 | ||
3218 | bio_endio(bio, err); | |
7d2b4daa | 3219 | } else if (!is_orig_bio) { |
8790d502 CM |
3220 | bio_put(bio); |
3221 | } | |
8790d502 CM |
3222 | } |
3223 | ||
8b712842 CM |
3224 | struct async_sched { |
3225 | struct bio *bio; | |
3226 | int rw; | |
3227 | struct btrfs_fs_info *info; | |
3228 | struct btrfs_work work; | |
3229 | }; | |
3230 | ||
3231 | /* | |
3232 | * see run_scheduled_bios for a description of why bios are collected for | |
3233 | * async submit. | |
3234 | * | |
3235 | * This will add one bio to the pending list for a device and make sure | |
3236 | * the work struct is scheduled. | |
3237 | */ | |
d397712b | 3238 | static noinline int schedule_bio(struct btrfs_root *root, |
a1b32a59 CM |
3239 | struct btrfs_device *device, |
3240 | int rw, struct bio *bio) | |
8b712842 CM |
3241 | { |
3242 | int should_queue = 1; | |
ffbd517d | 3243 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
3244 | |
3245 | /* don't bother with additional async steps for reads, right now */ | |
7b6d91da | 3246 | if (!(rw & REQ_WRITE)) { |
492bb6de | 3247 | bio_get(bio); |
8b712842 | 3248 | submit_bio(rw, bio); |
492bb6de | 3249 | bio_put(bio); |
8b712842 CM |
3250 | return 0; |
3251 | } | |
3252 | ||
3253 | /* | |
0986fe9e | 3254 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
3255 | * higher layers. Otherwise, the async bio makes it appear we have |
3256 | * made progress against dirty pages when we've really just put it | |
3257 | * on a queue for later | |
3258 | */ | |
0986fe9e | 3259 | atomic_inc(&root->fs_info->nr_async_bios); |
492bb6de | 3260 | WARN_ON(bio->bi_next); |
8b712842 CM |
3261 | bio->bi_next = NULL; |
3262 | bio->bi_rw |= rw; | |
3263 | ||
3264 | spin_lock(&device->io_lock); | |
7b6d91da | 3265 | if (bio->bi_rw & REQ_SYNC) |
ffbd517d CM |
3266 | pending_bios = &device->pending_sync_bios; |
3267 | else | |
3268 | pending_bios = &device->pending_bios; | |
8b712842 | 3269 | |
ffbd517d CM |
3270 | if (pending_bios->tail) |
3271 | pending_bios->tail->bi_next = bio; | |
8b712842 | 3272 | |
ffbd517d CM |
3273 | pending_bios->tail = bio; |
3274 | if (!pending_bios->head) | |
3275 | pending_bios->head = bio; | |
8b712842 CM |
3276 | if (device->running_pending) |
3277 | should_queue = 0; | |
3278 | ||
3279 | spin_unlock(&device->io_lock); | |
3280 | ||
3281 | if (should_queue) | |
1cc127b5 CM |
3282 | btrfs_queue_worker(&root->fs_info->submit_workers, |
3283 | &device->work); | |
8b712842 CM |
3284 | return 0; |
3285 | } | |
3286 | ||
f188591e | 3287 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 3288 | int mirror_num, int async_submit) |
0b86a832 CM |
3289 | { |
3290 | struct btrfs_mapping_tree *map_tree; | |
3291 | struct btrfs_device *dev; | |
8790d502 | 3292 | struct bio *first_bio = bio; |
a62b9401 | 3293 | u64 logical = (u64)bio->bi_sector << 9; |
0b86a832 CM |
3294 | u64 length = 0; |
3295 | u64 map_length; | |
cea9e445 | 3296 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 3297 | int ret; |
8790d502 CM |
3298 | int dev_nr = 0; |
3299 | int total_devs = 1; | |
0b86a832 | 3300 | |
f2d8d74d | 3301 | length = bio->bi_size; |
0b86a832 CM |
3302 | map_tree = &root->fs_info->mapping_tree; |
3303 | map_length = length; | |
cea9e445 | 3304 | |
f188591e CM |
3305 | ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi, |
3306 | mirror_num); | |
cea9e445 CM |
3307 | BUG_ON(ret); |
3308 | ||
3309 | total_devs = multi->num_stripes; | |
3310 | if (map_length < length) { | |
d397712b CM |
3311 | printk(KERN_CRIT "mapping failed logical %llu bio len %llu " |
3312 | "len %llu\n", (unsigned long long)logical, | |
3313 | (unsigned long long)length, | |
3314 | (unsigned long long)map_length); | |
cea9e445 CM |
3315 | BUG(); |
3316 | } | |
3317 | multi->end_io = first_bio->bi_end_io; | |
3318 | multi->private = first_bio->bi_private; | |
7d2b4daa | 3319 | multi->orig_bio = first_bio; |
cea9e445 CM |
3320 | atomic_set(&multi->stripes_pending, multi->num_stripes); |
3321 | ||
d397712b | 3322 | while (dev_nr < total_devs) { |
8790d502 | 3323 | if (total_devs > 1) { |
8790d502 CM |
3324 | if (dev_nr < total_devs - 1) { |
3325 | bio = bio_clone(first_bio, GFP_NOFS); | |
3326 | BUG_ON(!bio); | |
3327 | } else { | |
3328 | bio = first_bio; | |
3329 | } | |
3330 | bio->bi_private = multi; | |
3331 | bio->bi_end_io = end_bio_multi_stripe; | |
3332 | } | |
cea9e445 CM |
3333 | bio->bi_sector = multi->stripes[dev_nr].physical >> 9; |
3334 | dev = multi->stripes[dev_nr].dev; | |
18e503d6 | 3335 | if (dev && dev->bdev && (rw != WRITE || dev->writeable)) { |
dfe25020 | 3336 | bio->bi_bdev = dev->bdev; |
8b712842 CM |
3337 | if (async_submit) |
3338 | schedule_bio(root, dev, rw, bio); | |
3339 | else | |
3340 | submit_bio(rw, bio); | |
dfe25020 CM |
3341 | } else { |
3342 | bio->bi_bdev = root->fs_info->fs_devices->latest_bdev; | |
3343 | bio->bi_sector = logical >> 9; | |
dfe25020 | 3344 | bio_endio(bio, -EIO); |
dfe25020 | 3345 | } |
8790d502 CM |
3346 | dev_nr++; |
3347 | } | |
cea9e445 CM |
3348 | if (total_devs == 1) |
3349 | kfree(multi); | |
0b86a832 CM |
3350 | return 0; |
3351 | } | |
3352 | ||
a443755f | 3353 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, |
2b82032c | 3354 | u8 *uuid, u8 *fsid) |
0b86a832 | 3355 | { |
2b82032c YZ |
3356 | struct btrfs_device *device; |
3357 | struct btrfs_fs_devices *cur_devices; | |
3358 | ||
3359 | cur_devices = root->fs_info->fs_devices; | |
3360 | while (cur_devices) { | |
3361 | if (!fsid || | |
3362 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
3363 | device = __find_device(&cur_devices->devices, | |
3364 | devid, uuid); | |
3365 | if (device) | |
3366 | return device; | |
3367 | } | |
3368 | cur_devices = cur_devices->seed; | |
3369 | } | |
3370 | return NULL; | |
0b86a832 CM |
3371 | } |
3372 | ||
dfe25020 CM |
3373 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
3374 | u64 devid, u8 *dev_uuid) | |
3375 | { | |
3376 | struct btrfs_device *device; | |
3377 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
3378 | ||
3379 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
7cbd8a83 | 3380 | if (!device) |
3381 | return NULL; | |
dfe25020 CM |
3382 | list_add(&device->dev_list, |
3383 | &fs_devices->devices); | |
dfe25020 CM |
3384 | device->dev_root = root->fs_info->dev_root; |
3385 | device->devid = devid; | |
8b712842 | 3386 | device->work.func = pending_bios_fn; |
e4404d6e | 3387 | device->fs_devices = fs_devices; |
cd02dca5 | 3388 | device->missing = 1; |
dfe25020 | 3389 | fs_devices->num_devices++; |
cd02dca5 | 3390 | fs_devices->missing_devices++; |
dfe25020 | 3391 | spin_lock_init(&device->io_lock); |
d20f7043 | 3392 | INIT_LIST_HEAD(&device->dev_alloc_list); |
dfe25020 CM |
3393 | memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE); |
3394 | return device; | |
3395 | } | |
3396 | ||
0b86a832 CM |
3397 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
3398 | struct extent_buffer *leaf, | |
3399 | struct btrfs_chunk *chunk) | |
3400 | { | |
3401 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
3402 | struct map_lookup *map; | |
3403 | struct extent_map *em; | |
3404 | u64 logical; | |
3405 | u64 length; | |
3406 | u64 devid; | |
a443755f | 3407 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 3408 | int num_stripes; |
0b86a832 | 3409 | int ret; |
593060d7 | 3410 | int i; |
0b86a832 | 3411 | |
e17cade2 CM |
3412 | logical = key->offset; |
3413 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 3414 | |
890871be | 3415 | read_lock(&map_tree->map_tree.lock); |
0b86a832 | 3416 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
890871be | 3417 | read_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
3418 | |
3419 | /* already mapped? */ | |
3420 | if (em && em->start <= logical && em->start + em->len > logical) { | |
3421 | free_extent_map(em); | |
0b86a832 CM |
3422 | return 0; |
3423 | } else if (em) { | |
3424 | free_extent_map(em); | |
3425 | } | |
0b86a832 | 3426 | |
172ddd60 | 3427 | em = alloc_extent_map(); |
0b86a832 CM |
3428 | if (!em) |
3429 | return -ENOMEM; | |
593060d7 CM |
3430 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
3431 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
3432 | if (!map) { |
3433 | free_extent_map(em); | |
3434 | return -ENOMEM; | |
3435 | } | |
3436 | ||
3437 | em->bdev = (struct block_device *)map; | |
3438 | em->start = logical; | |
3439 | em->len = length; | |
3440 | em->block_start = 0; | |
c8b97818 | 3441 | em->block_len = em->len; |
0b86a832 | 3442 | |
593060d7 CM |
3443 | map->num_stripes = num_stripes; |
3444 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
3445 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
3446 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
3447 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
3448 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 3449 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
3450 | for (i = 0; i < num_stripes; i++) { |
3451 | map->stripes[i].physical = | |
3452 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
3453 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
3454 | read_extent_buffer(leaf, uuid, (unsigned long) |
3455 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
3456 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
3457 | map->stripes[i].dev = btrfs_find_device(root, devid, uuid, |
3458 | NULL); | |
dfe25020 | 3459 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
593060d7 CM |
3460 | kfree(map); |
3461 | free_extent_map(em); | |
3462 | return -EIO; | |
3463 | } | |
dfe25020 CM |
3464 | if (!map->stripes[i].dev) { |
3465 | map->stripes[i].dev = | |
3466 | add_missing_dev(root, devid, uuid); | |
3467 | if (!map->stripes[i].dev) { | |
3468 | kfree(map); | |
3469 | free_extent_map(em); | |
3470 | return -EIO; | |
3471 | } | |
3472 | } | |
3473 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
3474 | } |
3475 | ||
890871be | 3476 | write_lock(&map_tree->map_tree.lock); |
0b86a832 | 3477 | ret = add_extent_mapping(&map_tree->map_tree, em); |
890871be | 3478 | write_unlock(&map_tree->map_tree.lock); |
b248a415 | 3479 | BUG_ON(ret); |
0b86a832 CM |
3480 | free_extent_map(em); |
3481 | ||
3482 | return 0; | |
3483 | } | |
3484 | ||
3485 | static int fill_device_from_item(struct extent_buffer *leaf, | |
3486 | struct btrfs_dev_item *dev_item, | |
3487 | struct btrfs_device *device) | |
3488 | { | |
3489 | unsigned long ptr; | |
0b86a832 CM |
3490 | |
3491 | device->devid = btrfs_device_id(leaf, dev_item); | |
d6397bae CB |
3492 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
3493 | device->total_bytes = device->disk_total_bytes; | |
0b86a832 CM |
3494 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
3495 | device->type = btrfs_device_type(leaf, dev_item); | |
3496 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
3497 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
3498 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
0b86a832 CM |
3499 | |
3500 | ptr = (unsigned long)btrfs_device_uuid(dev_item); | |
e17cade2 | 3501 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 3502 | |
0b86a832 CM |
3503 | return 0; |
3504 | } | |
3505 | ||
2b82032c YZ |
3506 | static int open_seed_devices(struct btrfs_root *root, u8 *fsid) |
3507 | { | |
3508 | struct btrfs_fs_devices *fs_devices; | |
3509 | int ret; | |
3510 | ||
3511 | mutex_lock(&uuid_mutex); | |
3512 | ||
3513 | fs_devices = root->fs_info->fs_devices->seed; | |
3514 | while (fs_devices) { | |
3515 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
3516 | ret = 0; | |
3517 | goto out; | |
3518 | } | |
3519 | fs_devices = fs_devices->seed; | |
3520 | } | |
3521 | ||
3522 | fs_devices = find_fsid(fsid); | |
3523 | if (!fs_devices) { | |
3524 | ret = -ENOENT; | |
3525 | goto out; | |
3526 | } | |
e4404d6e YZ |
3527 | |
3528 | fs_devices = clone_fs_devices(fs_devices); | |
3529 | if (IS_ERR(fs_devices)) { | |
3530 | ret = PTR_ERR(fs_devices); | |
2b82032c YZ |
3531 | goto out; |
3532 | } | |
3533 | ||
97288f2c | 3534 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
15916de8 | 3535 | root->fs_info->bdev_holder); |
2b82032c YZ |
3536 | if (ret) |
3537 | goto out; | |
3538 | ||
3539 | if (!fs_devices->seeding) { | |
3540 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 3541 | free_fs_devices(fs_devices); |
2b82032c YZ |
3542 | ret = -EINVAL; |
3543 | goto out; | |
3544 | } | |
3545 | ||
3546 | fs_devices->seed = root->fs_info->fs_devices->seed; | |
3547 | root->fs_info->fs_devices->seed = fs_devices; | |
2b82032c YZ |
3548 | out: |
3549 | mutex_unlock(&uuid_mutex); | |
3550 | return ret; | |
3551 | } | |
3552 | ||
0d81ba5d | 3553 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
3554 | struct extent_buffer *leaf, |
3555 | struct btrfs_dev_item *dev_item) | |
3556 | { | |
3557 | struct btrfs_device *device; | |
3558 | u64 devid; | |
3559 | int ret; | |
2b82032c | 3560 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
3561 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
3562 | ||
0b86a832 | 3563 | devid = btrfs_device_id(leaf, dev_item); |
a443755f CM |
3564 | read_extent_buffer(leaf, dev_uuid, |
3565 | (unsigned long)btrfs_device_uuid(dev_item), | |
3566 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
3567 | read_extent_buffer(leaf, fs_uuid, |
3568 | (unsigned long)btrfs_device_fsid(dev_item), | |
3569 | BTRFS_UUID_SIZE); | |
3570 | ||
3571 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { | |
3572 | ret = open_seed_devices(root, fs_uuid); | |
e4404d6e | 3573 | if (ret && !btrfs_test_opt(root, DEGRADED)) |
2b82032c | 3574 | return ret; |
2b82032c YZ |
3575 | } |
3576 | ||
3577 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
3578 | if (!device || !device->bdev) { | |
e4404d6e | 3579 | if (!btrfs_test_opt(root, DEGRADED)) |
2b82032c YZ |
3580 | return -EIO; |
3581 | ||
3582 | if (!device) { | |
d397712b CM |
3583 | printk(KERN_WARNING "warning devid %llu missing\n", |
3584 | (unsigned long long)devid); | |
2b82032c YZ |
3585 | device = add_missing_dev(root, devid, dev_uuid); |
3586 | if (!device) | |
3587 | return -ENOMEM; | |
cd02dca5 CM |
3588 | } else if (!device->missing) { |
3589 | /* | |
3590 | * this happens when a device that was properly setup | |
3591 | * in the device info lists suddenly goes bad. | |
3592 | * device->bdev is NULL, and so we have to set | |
3593 | * device->missing to one here | |
3594 | */ | |
3595 | root->fs_info->fs_devices->missing_devices++; | |
3596 | device->missing = 1; | |
2b82032c YZ |
3597 | } |
3598 | } | |
3599 | ||
3600 | if (device->fs_devices != root->fs_info->fs_devices) { | |
3601 | BUG_ON(device->writeable); | |
3602 | if (device->generation != | |
3603 | btrfs_device_generation(leaf, dev_item)) | |
3604 | return -EINVAL; | |
6324fbf3 | 3605 | } |
0b86a832 CM |
3606 | |
3607 | fill_device_from_item(leaf, dev_item, device); | |
3608 | device->dev_root = root->fs_info->dev_root; | |
dfe25020 | 3609 | device->in_fs_metadata = 1; |
2b82032c YZ |
3610 | if (device->writeable) |
3611 | device->fs_devices->total_rw_bytes += device->total_bytes; | |
0b86a832 | 3612 | ret = 0; |
0b86a832 CM |
3613 | return ret; |
3614 | } | |
3615 | ||
e4404d6e | 3616 | int btrfs_read_sys_array(struct btrfs_root *root) |
0b86a832 CM |
3617 | { |
3618 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
a061fc8d | 3619 | struct extent_buffer *sb; |
0b86a832 | 3620 | struct btrfs_disk_key *disk_key; |
0b86a832 | 3621 | struct btrfs_chunk *chunk; |
84eed90f CM |
3622 | u8 *ptr; |
3623 | unsigned long sb_ptr; | |
3624 | int ret = 0; | |
0b86a832 CM |
3625 | u32 num_stripes; |
3626 | u32 array_size; | |
3627 | u32 len = 0; | |
0b86a832 | 3628 | u32 cur; |
84eed90f | 3629 | struct btrfs_key key; |
0b86a832 | 3630 | |
e4404d6e | 3631 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET, |
a061fc8d CM |
3632 | BTRFS_SUPER_INFO_SIZE); |
3633 | if (!sb) | |
3634 | return -ENOMEM; | |
3635 | btrfs_set_buffer_uptodate(sb); | |
85d4e461 | 3636 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0); |
4008c04a | 3637 | |
a061fc8d | 3638 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
3639 | array_size = btrfs_super_sys_array_size(super_copy); |
3640 | ||
0b86a832 CM |
3641 | ptr = super_copy->sys_chunk_array; |
3642 | sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array); | |
3643 | cur = 0; | |
3644 | ||
3645 | while (cur < array_size) { | |
3646 | disk_key = (struct btrfs_disk_key *)ptr; | |
3647 | btrfs_disk_key_to_cpu(&key, disk_key); | |
3648 | ||
a061fc8d | 3649 | len = sizeof(*disk_key); ptr += len; |
0b86a832 CM |
3650 | sb_ptr += len; |
3651 | cur += len; | |
3652 | ||
0d81ba5d | 3653 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
0b86a832 | 3654 | chunk = (struct btrfs_chunk *)sb_ptr; |
0d81ba5d | 3655 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
3656 | if (ret) |
3657 | break; | |
0b86a832 CM |
3658 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); |
3659 | len = btrfs_chunk_item_size(num_stripes); | |
3660 | } else { | |
84eed90f CM |
3661 | ret = -EIO; |
3662 | break; | |
0b86a832 CM |
3663 | } |
3664 | ptr += len; | |
3665 | sb_ptr += len; | |
3666 | cur += len; | |
3667 | } | |
a061fc8d | 3668 | free_extent_buffer(sb); |
84eed90f | 3669 | return ret; |
0b86a832 CM |
3670 | } |
3671 | ||
3672 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
3673 | { | |
3674 | struct btrfs_path *path; | |
3675 | struct extent_buffer *leaf; | |
3676 | struct btrfs_key key; | |
3677 | struct btrfs_key found_key; | |
3678 | int ret; | |
3679 | int slot; | |
3680 | ||
3681 | root = root->fs_info->chunk_root; | |
3682 | ||
3683 | path = btrfs_alloc_path(); | |
3684 | if (!path) | |
3685 | return -ENOMEM; | |
3686 | ||
3687 | /* first we search for all of the device items, and then we | |
3688 | * read in all of the chunk items. This way we can create chunk | |
3689 | * mappings that reference all of the devices that are afound | |
3690 | */ | |
3691 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
3692 | key.offset = 0; | |
3693 | key.type = 0; | |
3694 | again: | |
3695 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
ab59381e ZL |
3696 | if (ret < 0) |
3697 | goto error; | |
d397712b | 3698 | while (1) { |
0b86a832 CM |
3699 | leaf = path->nodes[0]; |
3700 | slot = path->slots[0]; | |
3701 | if (slot >= btrfs_header_nritems(leaf)) { | |
3702 | ret = btrfs_next_leaf(root, path); | |
3703 | if (ret == 0) | |
3704 | continue; | |
3705 | if (ret < 0) | |
3706 | goto error; | |
3707 | break; | |
3708 | } | |
3709 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
3710 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3711 | if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID) | |
3712 | break; | |
3713 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { | |
3714 | struct btrfs_dev_item *dev_item; | |
3715 | dev_item = btrfs_item_ptr(leaf, slot, | |
3716 | struct btrfs_dev_item); | |
0d81ba5d | 3717 | ret = read_one_dev(root, leaf, dev_item); |
2b82032c YZ |
3718 | if (ret) |
3719 | goto error; | |
0b86a832 CM |
3720 | } |
3721 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { | |
3722 | struct btrfs_chunk *chunk; | |
3723 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
3724 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2b82032c YZ |
3725 | if (ret) |
3726 | goto error; | |
0b86a832 CM |
3727 | } |
3728 | path->slots[0]++; | |
3729 | } | |
3730 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3731 | key.objectid = 0; | |
b3b4aa74 | 3732 | btrfs_release_path(path); |
0b86a832 CM |
3733 | goto again; |
3734 | } | |
0b86a832 CM |
3735 | ret = 0; |
3736 | error: | |
2b82032c | 3737 | btrfs_free_path(path); |
0b86a832 CM |
3738 | return ret; |
3739 | } |