Commit | Line | Data |
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0b86a832 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | #include <linux/sched.h> | |
19 | #include <linux/bio.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
8a4b83cc | 21 | #include <linux/buffer_head.h> |
f2d8d74d | 22 | #include <linux/blkdev.h> |
788f20eb | 23 | #include <linux/random.h> |
b765ead5 | 24 | #include <linux/iocontext.h> |
6f88a440 | 25 | #include <linux/capability.h> |
593060d7 | 26 | #include <asm/div64.h> |
4b4e25f2 | 27 | #include "compat.h" |
0b86a832 CM |
28 | #include "ctree.h" |
29 | #include "extent_map.h" | |
30 | #include "disk-io.h" | |
31 | #include "transaction.h" | |
32 | #include "print-tree.h" | |
33 | #include "volumes.h" | |
8b712842 | 34 | #include "async-thread.h" |
0b86a832 | 35 | |
593060d7 CM |
36 | struct map_lookup { |
37 | u64 type; | |
38 | int io_align; | |
39 | int io_width; | |
40 | int stripe_len; | |
41 | int sector_size; | |
42 | int num_stripes; | |
321aecc6 | 43 | int sub_stripes; |
cea9e445 | 44 | struct btrfs_bio_stripe stripes[]; |
593060d7 CM |
45 | }; |
46 | ||
2b82032c YZ |
47 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
48 | struct btrfs_root *root, | |
49 | struct btrfs_device *device); | |
50 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); | |
51 | ||
593060d7 | 52 | #define map_lookup_size(n) (sizeof(struct map_lookup) + \ |
cea9e445 | 53 | (sizeof(struct btrfs_bio_stripe) * (n))) |
593060d7 | 54 | |
8a4b83cc CM |
55 | static DEFINE_MUTEX(uuid_mutex); |
56 | static LIST_HEAD(fs_uuids); | |
57 | ||
a061fc8d CM |
58 | void btrfs_lock_volumes(void) |
59 | { | |
60 | mutex_lock(&uuid_mutex); | |
61 | } | |
62 | ||
63 | void btrfs_unlock_volumes(void) | |
64 | { | |
65 | mutex_unlock(&uuid_mutex); | |
66 | } | |
67 | ||
7d9eb12c CM |
68 | static void lock_chunks(struct btrfs_root *root) |
69 | { | |
7d9eb12c CM |
70 | mutex_lock(&root->fs_info->chunk_mutex); |
71 | } | |
72 | ||
73 | static void unlock_chunks(struct btrfs_root *root) | |
74 | { | |
7d9eb12c CM |
75 | mutex_unlock(&root->fs_info->chunk_mutex); |
76 | } | |
77 | ||
e4404d6e YZ |
78 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
79 | { | |
80 | struct btrfs_device *device; | |
81 | WARN_ON(fs_devices->opened); | |
82 | while (!list_empty(&fs_devices->devices)) { | |
83 | device = list_entry(fs_devices->devices.next, | |
84 | struct btrfs_device, dev_list); | |
85 | list_del(&device->dev_list); | |
86 | kfree(device->name); | |
87 | kfree(device); | |
88 | } | |
89 | kfree(fs_devices); | |
90 | } | |
91 | ||
8a4b83cc CM |
92 | int btrfs_cleanup_fs_uuids(void) |
93 | { | |
94 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 95 | |
2b82032c YZ |
96 | while (!list_empty(&fs_uuids)) { |
97 | fs_devices = list_entry(fs_uuids.next, | |
98 | struct btrfs_fs_devices, list); | |
99 | list_del(&fs_devices->list); | |
e4404d6e | 100 | free_fs_devices(fs_devices); |
8a4b83cc CM |
101 | } |
102 | return 0; | |
103 | } | |
104 | ||
a1b32a59 CM |
105 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
106 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
107 | { |
108 | struct btrfs_device *dev; | |
8a4b83cc | 109 | |
c6e30871 | 110 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 111 | if (dev->devid == devid && |
8f18cf13 | 112 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 113 | return dev; |
a443755f | 114 | } |
8a4b83cc CM |
115 | } |
116 | return NULL; | |
117 | } | |
118 | ||
a1b32a59 | 119 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 120 | { |
8a4b83cc CM |
121 | struct btrfs_fs_devices *fs_devices; |
122 | ||
c6e30871 | 123 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
124 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
125 | return fs_devices; | |
126 | } | |
127 | return NULL; | |
128 | } | |
129 | ||
ffbd517d CM |
130 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
131 | struct bio *head, struct bio *tail) | |
132 | { | |
133 | ||
134 | struct bio *old_head; | |
135 | ||
136 | old_head = pending_bios->head; | |
137 | pending_bios->head = head; | |
138 | if (pending_bios->tail) | |
139 | tail->bi_next = old_head; | |
140 | else | |
141 | pending_bios->tail = tail; | |
142 | } | |
143 | ||
8b712842 CM |
144 | /* |
145 | * we try to collect pending bios for a device so we don't get a large | |
146 | * number of procs sending bios down to the same device. This greatly | |
147 | * improves the schedulers ability to collect and merge the bios. | |
148 | * | |
149 | * But, it also turns into a long list of bios to process and that is sure | |
150 | * to eventually make the worker thread block. The solution here is to | |
151 | * make some progress and then put this work struct back at the end of | |
152 | * the list if the block device is congested. This way, multiple devices | |
153 | * can make progress from a single worker thread. | |
154 | */ | |
d397712b | 155 | static noinline int run_scheduled_bios(struct btrfs_device *device) |
8b712842 CM |
156 | { |
157 | struct bio *pending; | |
158 | struct backing_dev_info *bdi; | |
b64a2851 | 159 | struct btrfs_fs_info *fs_info; |
ffbd517d | 160 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
161 | struct bio *tail; |
162 | struct bio *cur; | |
163 | int again = 0; | |
ffbd517d CM |
164 | unsigned long num_run; |
165 | unsigned long num_sync_run; | |
d644d8a1 | 166 | unsigned long batch_run = 0; |
b64a2851 | 167 | unsigned long limit; |
b765ead5 | 168 | unsigned long last_waited = 0; |
d84275c9 | 169 | int force_reg = 0; |
8b712842 | 170 | |
bedf762b | 171 | bdi = blk_get_backing_dev_info(device->bdev); |
b64a2851 CM |
172 | fs_info = device->dev_root->fs_info; |
173 | limit = btrfs_async_submit_limit(fs_info); | |
174 | limit = limit * 2 / 3; | |
175 | ||
ffbd517d CM |
176 | /* we want to make sure that every time we switch from the sync |
177 | * list to the normal list, we unplug | |
178 | */ | |
179 | num_sync_run = 0; | |
180 | ||
8b712842 CM |
181 | loop: |
182 | spin_lock(&device->io_lock); | |
183 | ||
a6837051 | 184 | loop_lock: |
d84275c9 | 185 | num_run = 0; |
ffbd517d | 186 | |
8b712842 CM |
187 | /* take all the bios off the list at once and process them |
188 | * later on (without the lock held). But, remember the | |
189 | * tail and other pointers so the bios can be properly reinserted | |
190 | * into the list if we hit congestion | |
191 | */ | |
d84275c9 | 192 | if (!force_reg && device->pending_sync_bios.head) { |
ffbd517d | 193 | pending_bios = &device->pending_sync_bios; |
d84275c9 CM |
194 | force_reg = 1; |
195 | } else { | |
ffbd517d | 196 | pending_bios = &device->pending_bios; |
d84275c9 CM |
197 | force_reg = 0; |
198 | } | |
ffbd517d CM |
199 | |
200 | pending = pending_bios->head; | |
201 | tail = pending_bios->tail; | |
8b712842 | 202 | WARN_ON(pending && !tail); |
8b712842 CM |
203 | |
204 | /* | |
205 | * if pending was null this time around, no bios need processing | |
206 | * at all and we can stop. Otherwise it'll loop back up again | |
207 | * and do an additional check so no bios are missed. | |
208 | * | |
209 | * device->running_pending is used to synchronize with the | |
210 | * schedule_bio code. | |
211 | */ | |
ffbd517d CM |
212 | if (device->pending_sync_bios.head == NULL && |
213 | device->pending_bios.head == NULL) { | |
8b712842 CM |
214 | again = 0; |
215 | device->running_pending = 0; | |
ffbd517d CM |
216 | } else { |
217 | again = 1; | |
218 | device->running_pending = 1; | |
8b712842 | 219 | } |
ffbd517d CM |
220 | |
221 | pending_bios->head = NULL; | |
222 | pending_bios->tail = NULL; | |
223 | ||
8b712842 CM |
224 | spin_unlock(&device->io_lock); |
225 | ||
ffbd517d CM |
226 | /* |
227 | * if we're doing the regular priority list, make sure we unplug | |
228 | * for any high prio bios we've sent down | |
229 | */ | |
230 | if (pending_bios == &device->pending_bios && num_sync_run > 0) { | |
231 | num_sync_run = 0; | |
232 | blk_run_backing_dev(bdi, NULL); | |
233 | } | |
234 | ||
d397712b | 235 | while (pending) { |
ffbd517d CM |
236 | |
237 | rmb(); | |
d84275c9 CM |
238 | /* we want to work on both lists, but do more bios on the |
239 | * sync list than the regular list | |
240 | */ | |
241 | if ((num_run > 32 && | |
242 | pending_bios != &device->pending_sync_bios && | |
243 | device->pending_sync_bios.head) || | |
244 | (num_run > 64 && pending_bios == &device->pending_sync_bios && | |
245 | device->pending_bios.head)) { | |
ffbd517d CM |
246 | spin_lock(&device->io_lock); |
247 | requeue_list(pending_bios, pending, tail); | |
248 | goto loop_lock; | |
249 | } | |
250 | ||
8b712842 CM |
251 | cur = pending; |
252 | pending = pending->bi_next; | |
253 | cur->bi_next = NULL; | |
b64a2851 CM |
254 | atomic_dec(&fs_info->nr_async_bios); |
255 | ||
256 | if (atomic_read(&fs_info->nr_async_bios) < limit && | |
257 | waitqueue_active(&fs_info->async_submit_wait)) | |
258 | wake_up(&fs_info->async_submit_wait); | |
492bb6de CM |
259 | |
260 | BUG_ON(atomic_read(&cur->bi_cnt) == 0); | |
d644d8a1 | 261 | |
7b6d91da | 262 | if (cur->bi_rw & REQ_SYNC) |
ffbd517d CM |
263 | num_sync_run++; |
264 | ||
5ff7ba3a CM |
265 | submit_bio(cur->bi_rw, cur); |
266 | num_run++; | |
267 | batch_run++; | |
ffbd517d CM |
268 | if (need_resched()) { |
269 | if (num_sync_run) { | |
270 | blk_run_backing_dev(bdi, NULL); | |
271 | num_sync_run = 0; | |
272 | } | |
273 | cond_resched(); | |
274 | } | |
8b712842 CM |
275 | |
276 | /* | |
277 | * we made progress, there is more work to do and the bdi | |
278 | * is now congested. Back off and let other work structs | |
279 | * run instead | |
280 | */ | |
57fd5a5f | 281 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
5f2cc086 | 282 | fs_info->fs_devices->open_devices > 1) { |
b765ead5 | 283 | struct io_context *ioc; |
8b712842 | 284 | |
b765ead5 CM |
285 | ioc = current->io_context; |
286 | ||
287 | /* | |
288 | * the main goal here is that we don't want to | |
289 | * block if we're going to be able to submit | |
290 | * more requests without blocking. | |
291 | * | |
292 | * This code does two great things, it pokes into | |
293 | * the elevator code from a filesystem _and_ | |
294 | * it makes assumptions about how batching works. | |
295 | */ | |
296 | if (ioc && ioc->nr_batch_requests > 0 && | |
297 | time_before(jiffies, ioc->last_waited + HZ/50UL) && | |
298 | (last_waited == 0 || | |
299 | ioc->last_waited == last_waited)) { | |
300 | /* | |
301 | * we want to go through our batch of | |
302 | * requests and stop. So, we copy out | |
303 | * the ioc->last_waited time and test | |
304 | * against it before looping | |
305 | */ | |
306 | last_waited = ioc->last_waited; | |
ffbd517d CM |
307 | if (need_resched()) { |
308 | if (num_sync_run) { | |
309 | blk_run_backing_dev(bdi, NULL); | |
310 | num_sync_run = 0; | |
311 | } | |
312 | cond_resched(); | |
313 | } | |
b765ead5 CM |
314 | continue; |
315 | } | |
8b712842 | 316 | spin_lock(&device->io_lock); |
ffbd517d | 317 | requeue_list(pending_bios, pending, tail); |
a6837051 | 318 | device->running_pending = 1; |
8b712842 CM |
319 | |
320 | spin_unlock(&device->io_lock); | |
321 | btrfs_requeue_work(&device->work); | |
322 | goto done; | |
323 | } | |
324 | } | |
ffbd517d CM |
325 | |
326 | if (num_sync_run) { | |
327 | num_sync_run = 0; | |
328 | blk_run_backing_dev(bdi, NULL); | |
329 | } | |
bedf762b CM |
330 | /* |
331 | * IO has already been through a long path to get here. Checksumming, | |
332 | * async helper threads, perhaps compression. We've done a pretty | |
333 | * good job of collecting a batch of IO and should just unplug | |
334 | * the device right away. | |
335 | * | |
336 | * This will help anyone who is waiting on the IO, they might have | |
337 | * already unplugged, but managed to do so before the bio they | |
338 | * cared about found its way down here. | |
339 | */ | |
340 | blk_run_backing_dev(bdi, NULL); | |
51684082 CM |
341 | |
342 | cond_resched(); | |
343 | if (again) | |
344 | goto loop; | |
345 | ||
346 | spin_lock(&device->io_lock); | |
347 | if (device->pending_bios.head || device->pending_sync_bios.head) | |
348 | goto loop_lock; | |
349 | spin_unlock(&device->io_lock); | |
350 | ||
8b712842 CM |
351 | done: |
352 | return 0; | |
353 | } | |
354 | ||
b2950863 | 355 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
356 | { |
357 | struct btrfs_device *device; | |
358 | ||
359 | device = container_of(work, struct btrfs_device, work); | |
360 | run_scheduled_bios(device); | |
361 | } | |
362 | ||
a1b32a59 | 363 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
364 | struct btrfs_super_block *disk_super, |
365 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
366 | { | |
367 | struct btrfs_device *device; | |
368 | struct btrfs_fs_devices *fs_devices; | |
369 | u64 found_transid = btrfs_super_generation(disk_super); | |
3a0524dc | 370 | char *name; |
8a4b83cc CM |
371 | |
372 | fs_devices = find_fsid(disk_super->fsid); | |
373 | if (!fs_devices) { | |
515dc322 | 374 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
8a4b83cc CM |
375 | if (!fs_devices) |
376 | return -ENOMEM; | |
377 | INIT_LIST_HEAD(&fs_devices->devices); | |
b3075717 | 378 | INIT_LIST_HEAD(&fs_devices->alloc_list); |
8a4b83cc CM |
379 | list_add(&fs_devices->list, &fs_uuids); |
380 | memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); | |
381 | fs_devices->latest_devid = devid; | |
382 | fs_devices->latest_trans = found_transid; | |
e5e9a520 | 383 | mutex_init(&fs_devices->device_list_mutex); |
8a4b83cc CM |
384 | device = NULL; |
385 | } else { | |
a443755f CM |
386 | device = __find_device(&fs_devices->devices, devid, |
387 | disk_super->dev_item.uuid); | |
8a4b83cc CM |
388 | } |
389 | if (!device) { | |
2b82032c YZ |
390 | if (fs_devices->opened) |
391 | return -EBUSY; | |
392 | ||
8a4b83cc CM |
393 | device = kzalloc(sizeof(*device), GFP_NOFS); |
394 | if (!device) { | |
395 | /* we can safely leave the fs_devices entry around */ | |
396 | return -ENOMEM; | |
397 | } | |
398 | device->devid = devid; | |
8b712842 | 399 | device->work.func = pending_bios_fn; |
a443755f CM |
400 | memcpy(device->uuid, disk_super->dev_item.uuid, |
401 | BTRFS_UUID_SIZE); | |
b248a415 | 402 | spin_lock_init(&device->io_lock); |
8a4b83cc CM |
403 | device->name = kstrdup(path, GFP_NOFS); |
404 | if (!device->name) { | |
405 | kfree(device); | |
406 | return -ENOMEM; | |
407 | } | |
2b82032c | 408 | INIT_LIST_HEAD(&device->dev_alloc_list); |
e5e9a520 CM |
409 | |
410 | mutex_lock(&fs_devices->device_list_mutex); | |
8a4b83cc | 411 | list_add(&device->dev_list, &fs_devices->devices); |
e5e9a520 CM |
412 | mutex_unlock(&fs_devices->device_list_mutex); |
413 | ||
2b82032c | 414 | device->fs_devices = fs_devices; |
8a4b83cc | 415 | fs_devices->num_devices++; |
cd02dca5 | 416 | } else if (!device->name || strcmp(device->name, path)) { |
3a0524dc TH |
417 | name = kstrdup(path, GFP_NOFS); |
418 | if (!name) | |
419 | return -ENOMEM; | |
420 | kfree(device->name); | |
421 | device->name = name; | |
cd02dca5 CM |
422 | if (device->missing) { |
423 | fs_devices->missing_devices--; | |
424 | device->missing = 0; | |
425 | } | |
8a4b83cc CM |
426 | } |
427 | ||
428 | if (found_transid > fs_devices->latest_trans) { | |
429 | fs_devices->latest_devid = devid; | |
430 | fs_devices->latest_trans = found_transid; | |
431 | } | |
8a4b83cc CM |
432 | *fs_devices_ret = fs_devices; |
433 | return 0; | |
434 | } | |
435 | ||
e4404d6e YZ |
436 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
437 | { | |
438 | struct btrfs_fs_devices *fs_devices; | |
439 | struct btrfs_device *device; | |
440 | struct btrfs_device *orig_dev; | |
441 | ||
442 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); | |
443 | if (!fs_devices) | |
444 | return ERR_PTR(-ENOMEM); | |
445 | ||
446 | INIT_LIST_HEAD(&fs_devices->devices); | |
447 | INIT_LIST_HEAD(&fs_devices->alloc_list); | |
448 | INIT_LIST_HEAD(&fs_devices->list); | |
e5e9a520 | 449 | mutex_init(&fs_devices->device_list_mutex); |
e4404d6e YZ |
450 | fs_devices->latest_devid = orig->latest_devid; |
451 | fs_devices->latest_trans = orig->latest_trans; | |
452 | memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid)); | |
453 | ||
e5e9a520 | 454 | mutex_lock(&orig->device_list_mutex); |
e4404d6e YZ |
455 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
456 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
457 | if (!device) | |
458 | goto error; | |
459 | ||
460 | device->name = kstrdup(orig_dev->name, GFP_NOFS); | |
fd2696f3 JL |
461 | if (!device->name) { |
462 | kfree(device); | |
e4404d6e | 463 | goto error; |
fd2696f3 | 464 | } |
e4404d6e YZ |
465 | |
466 | device->devid = orig_dev->devid; | |
467 | device->work.func = pending_bios_fn; | |
468 | memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid)); | |
e4404d6e YZ |
469 | spin_lock_init(&device->io_lock); |
470 | INIT_LIST_HEAD(&device->dev_list); | |
471 | INIT_LIST_HEAD(&device->dev_alloc_list); | |
472 | ||
473 | list_add(&device->dev_list, &fs_devices->devices); | |
474 | device->fs_devices = fs_devices; | |
475 | fs_devices->num_devices++; | |
476 | } | |
e5e9a520 | 477 | mutex_unlock(&orig->device_list_mutex); |
e4404d6e YZ |
478 | return fs_devices; |
479 | error: | |
e5e9a520 | 480 | mutex_unlock(&orig->device_list_mutex); |
e4404d6e YZ |
481 | free_fs_devices(fs_devices); |
482 | return ERR_PTR(-ENOMEM); | |
483 | } | |
484 | ||
dfe25020 CM |
485 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices) |
486 | { | |
c6e30871 | 487 | struct btrfs_device *device, *next; |
dfe25020 CM |
488 | |
489 | mutex_lock(&uuid_mutex); | |
490 | again: | |
e5e9a520 | 491 | mutex_lock(&fs_devices->device_list_mutex); |
c6e30871 | 492 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
2b82032c YZ |
493 | if (device->in_fs_metadata) |
494 | continue; | |
495 | ||
496 | if (device->bdev) { | |
d4d77629 | 497 | blkdev_put(device->bdev, device->mode); |
2b82032c YZ |
498 | device->bdev = NULL; |
499 | fs_devices->open_devices--; | |
500 | } | |
501 | if (device->writeable) { | |
502 | list_del_init(&device->dev_alloc_list); | |
503 | device->writeable = 0; | |
504 | fs_devices->rw_devices--; | |
505 | } | |
e4404d6e YZ |
506 | list_del_init(&device->dev_list); |
507 | fs_devices->num_devices--; | |
508 | kfree(device->name); | |
509 | kfree(device); | |
dfe25020 | 510 | } |
e5e9a520 | 511 | mutex_unlock(&fs_devices->device_list_mutex); |
2b82032c YZ |
512 | |
513 | if (fs_devices->seed) { | |
514 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
515 | goto again; |
516 | } | |
517 | ||
dfe25020 CM |
518 | mutex_unlock(&uuid_mutex); |
519 | return 0; | |
520 | } | |
a0af469b | 521 | |
2b82032c | 522 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 523 | { |
8a4b83cc | 524 | struct btrfs_device *device; |
e4404d6e | 525 | |
2b82032c YZ |
526 | if (--fs_devices->opened > 0) |
527 | return 0; | |
8a4b83cc | 528 | |
c6e30871 | 529 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
8a4b83cc | 530 | if (device->bdev) { |
d4d77629 | 531 | blkdev_put(device->bdev, device->mode); |
a0af469b | 532 | fs_devices->open_devices--; |
8a4b83cc | 533 | } |
2b82032c YZ |
534 | if (device->writeable) { |
535 | list_del_init(&device->dev_alloc_list); | |
536 | fs_devices->rw_devices--; | |
537 | } | |
538 | ||
8a4b83cc | 539 | device->bdev = NULL; |
2b82032c | 540 | device->writeable = 0; |
dfe25020 | 541 | device->in_fs_metadata = 0; |
8a4b83cc | 542 | } |
e4404d6e YZ |
543 | WARN_ON(fs_devices->open_devices); |
544 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
545 | fs_devices->opened = 0; |
546 | fs_devices->seeding = 0; | |
2b82032c | 547 | |
8a4b83cc CM |
548 | return 0; |
549 | } | |
550 | ||
2b82032c YZ |
551 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
552 | { | |
e4404d6e | 553 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
554 | int ret; |
555 | ||
556 | mutex_lock(&uuid_mutex); | |
557 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
558 | if (!fs_devices->opened) { |
559 | seed_devices = fs_devices->seed; | |
560 | fs_devices->seed = NULL; | |
561 | } | |
2b82032c | 562 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
563 | |
564 | while (seed_devices) { | |
565 | fs_devices = seed_devices; | |
566 | seed_devices = fs_devices->seed; | |
567 | __btrfs_close_devices(fs_devices); | |
568 | free_fs_devices(fs_devices); | |
569 | } | |
2b82032c YZ |
570 | return ret; |
571 | } | |
572 | ||
e4404d6e YZ |
573 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
574 | fmode_t flags, void *holder) | |
8a4b83cc CM |
575 | { |
576 | struct block_device *bdev; | |
577 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 578 | struct btrfs_device *device; |
a0af469b CM |
579 | struct block_device *latest_bdev = NULL; |
580 | struct buffer_head *bh; | |
581 | struct btrfs_super_block *disk_super; | |
582 | u64 latest_devid = 0; | |
583 | u64 latest_transid = 0; | |
a0af469b | 584 | u64 devid; |
2b82032c | 585 | int seeding = 1; |
a0af469b | 586 | int ret = 0; |
8a4b83cc | 587 | |
d4d77629 TH |
588 | flags |= FMODE_EXCL; |
589 | ||
c6e30871 | 590 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
591 | if (device->bdev) |
592 | continue; | |
dfe25020 CM |
593 | if (!device->name) |
594 | continue; | |
595 | ||
d4d77629 | 596 | bdev = blkdev_get_by_path(device->name, flags, holder); |
8a4b83cc | 597 | if (IS_ERR(bdev)) { |
d397712b | 598 | printk(KERN_INFO "open %s failed\n", device->name); |
a0af469b | 599 | goto error; |
8a4b83cc | 600 | } |
a061fc8d | 601 | set_blocksize(bdev, 4096); |
a0af469b | 602 | |
a512bbf8 | 603 | bh = btrfs_read_dev_super(bdev); |
20b45077 DY |
604 | if (!bh) { |
605 | ret = -EINVAL; | |
a0af469b | 606 | goto error_close; |
20b45077 | 607 | } |
a0af469b CM |
608 | |
609 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 610 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
a0af469b CM |
611 | if (devid != device->devid) |
612 | goto error_brelse; | |
613 | ||
2b82032c YZ |
614 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
615 | BTRFS_UUID_SIZE)) | |
616 | goto error_brelse; | |
617 | ||
618 | device->generation = btrfs_super_generation(disk_super); | |
619 | if (!latest_transid || device->generation > latest_transid) { | |
a0af469b | 620 | latest_devid = devid; |
2b82032c | 621 | latest_transid = device->generation; |
a0af469b CM |
622 | latest_bdev = bdev; |
623 | } | |
624 | ||
2b82032c YZ |
625 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
626 | device->writeable = 0; | |
627 | } else { | |
628 | device->writeable = !bdev_read_only(bdev); | |
629 | seeding = 0; | |
630 | } | |
631 | ||
8a4b83cc | 632 | device->bdev = bdev; |
dfe25020 | 633 | device->in_fs_metadata = 0; |
15916de8 CM |
634 | device->mode = flags; |
635 | ||
c289811c CM |
636 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
637 | fs_devices->rotating = 1; | |
638 | ||
a0af469b | 639 | fs_devices->open_devices++; |
2b82032c YZ |
640 | if (device->writeable) { |
641 | fs_devices->rw_devices++; | |
642 | list_add(&device->dev_alloc_list, | |
643 | &fs_devices->alloc_list); | |
644 | } | |
a0af469b | 645 | continue; |
a061fc8d | 646 | |
a0af469b CM |
647 | error_brelse: |
648 | brelse(bh); | |
649 | error_close: | |
d4d77629 | 650 | blkdev_put(bdev, flags); |
a0af469b CM |
651 | error: |
652 | continue; | |
8a4b83cc | 653 | } |
a0af469b CM |
654 | if (fs_devices->open_devices == 0) { |
655 | ret = -EIO; | |
656 | goto out; | |
657 | } | |
2b82032c YZ |
658 | fs_devices->seeding = seeding; |
659 | fs_devices->opened = 1; | |
a0af469b CM |
660 | fs_devices->latest_bdev = latest_bdev; |
661 | fs_devices->latest_devid = latest_devid; | |
662 | fs_devices->latest_trans = latest_transid; | |
2b82032c | 663 | fs_devices->total_rw_bytes = 0; |
a0af469b | 664 | out: |
2b82032c YZ |
665 | return ret; |
666 | } | |
667 | ||
668 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 669 | fmode_t flags, void *holder) |
2b82032c YZ |
670 | { |
671 | int ret; | |
672 | ||
673 | mutex_lock(&uuid_mutex); | |
674 | if (fs_devices->opened) { | |
e4404d6e YZ |
675 | fs_devices->opened++; |
676 | ret = 0; | |
2b82032c | 677 | } else { |
15916de8 | 678 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 679 | } |
8a4b83cc | 680 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
681 | return ret; |
682 | } | |
683 | ||
97288f2c | 684 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
685 | struct btrfs_fs_devices **fs_devices_ret) |
686 | { | |
687 | struct btrfs_super_block *disk_super; | |
688 | struct block_device *bdev; | |
689 | struct buffer_head *bh; | |
690 | int ret; | |
691 | u64 devid; | |
f2984462 | 692 | u64 transid; |
8a4b83cc CM |
693 | |
694 | mutex_lock(&uuid_mutex); | |
695 | ||
d4d77629 TH |
696 | flags |= FMODE_EXCL; |
697 | bdev = blkdev_get_by_path(path, flags, holder); | |
8a4b83cc CM |
698 | |
699 | if (IS_ERR(bdev)) { | |
8a4b83cc CM |
700 | ret = PTR_ERR(bdev); |
701 | goto error; | |
702 | } | |
703 | ||
704 | ret = set_blocksize(bdev, 4096); | |
705 | if (ret) | |
706 | goto error_close; | |
a512bbf8 | 707 | bh = btrfs_read_dev_super(bdev); |
8a4b83cc | 708 | if (!bh) { |
20b45077 | 709 | ret = -EINVAL; |
8a4b83cc CM |
710 | goto error_close; |
711 | } | |
712 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 713 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
f2984462 | 714 | transid = btrfs_super_generation(disk_super); |
7ae9c09d | 715 | if (disk_super->label[0]) |
d397712b | 716 | printk(KERN_INFO "device label %s ", disk_super->label); |
7ae9c09d CM |
717 | else { |
718 | /* FIXME, make a readl uuid parser */ | |
d397712b | 719 | printk(KERN_INFO "device fsid %llx-%llx ", |
7ae9c09d CM |
720 | *(unsigned long long *)disk_super->fsid, |
721 | *(unsigned long long *)(disk_super->fsid + 8)); | |
722 | } | |
119e10cf | 723 | printk(KERN_CONT "devid %llu transid %llu %s\n", |
d397712b | 724 | (unsigned long long)devid, (unsigned long long)transid, path); |
8a4b83cc CM |
725 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
726 | ||
8a4b83cc CM |
727 | brelse(bh); |
728 | error_close: | |
d4d77629 | 729 | blkdev_put(bdev, flags); |
8a4b83cc CM |
730 | error: |
731 | mutex_unlock(&uuid_mutex); | |
732 | return ret; | |
733 | } | |
0b86a832 | 734 | |
6d07bcec MX |
735 | /* helper to account the used device space in the range */ |
736 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, | |
737 | u64 end, u64 *length) | |
738 | { | |
739 | struct btrfs_key key; | |
740 | struct btrfs_root *root = device->dev_root; | |
741 | struct btrfs_dev_extent *dev_extent; | |
742 | struct btrfs_path *path; | |
743 | u64 extent_end; | |
744 | int ret; | |
745 | int slot; | |
746 | struct extent_buffer *l; | |
747 | ||
748 | *length = 0; | |
749 | ||
750 | if (start >= device->total_bytes) | |
751 | return 0; | |
752 | ||
753 | path = btrfs_alloc_path(); | |
754 | if (!path) | |
755 | return -ENOMEM; | |
756 | path->reada = 2; | |
757 | ||
758 | key.objectid = device->devid; | |
759 | key.offset = start; | |
760 | key.type = BTRFS_DEV_EXTENT_KEY; | |
761 | ||
762 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
763 | if (ret < 0) | |
764 | goto out; | |
765 | if (ret > 0) { | |
766 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
767 | if (ret < 0) | |
768 | goto out; | |
769 | } | |
770 | ||
771 | while (1) { | |
772 | l = path->nodes[0]; | |
773 | slot = path->slots[0]; | |
774 | if (slot >= btrfs_header_nritems(l)) { | |
775 | ret = btrfs_next_leaf(root, path); | |
776 | if (ret == 0) | |
777 | continue; | |
778 | if (ret < 0) | |
779 | goto out; | |
780 | ||
781 | break; | |
782 | } | |
783 | btrfs_item_key_to_cpu(l, &key, slot); | |
784 | ||
785 | if (key.objectid < device->devid) | |
786 | goto next; | |
787 | ||
788 | if (key.objectid > device->devid) | |
789 | break; | |
790 | ||
791 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) | |
792 | goto next; | |
793 | ||
794 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
795 | extent_end = key.offset + btrfs_dev_extent_length(l, | |
796 | dev_extent); | |
797 | if (key.offset <= start && extent_end > end) { | |
798 | *length = end - start + 1; | |
799 | break; | |
800 | } else if (key.offset <= start && extent_end > start) | |
801 | *length += extent_end - start; | |
802 | else if (key.offset > start && extent_end <= end) | |
803 | *length += extent_end - key.offset; | |
804 | else if (key.offset > start && key.offset <= end) { | |
805 | *length += end - key.offset + 1; | |
806 | break; | |
807 | } else if (key.offset > end) | |
808 | break; | |
809 | ||
810 | next: | |
811 | path->slots[0]++; | |
812 | } | |
813 | ret = 0; | |
814 | out: | |
815 | btrfs_free_path(path); | |
816 | return ret; | |
817 | } | |
818 | ||
0b86a832 | 819 | /* |
7bfc837d MX |
820 | * find_free_dev_extent - find free space in the specified device |
821 | * @trans: transaction handler | |
822 | * @device: the device which we search the free space in | |
823 | * @num_bytes: the size of the free space that we need | |
824 | * @start: store the start of the free space. | |
825 | * @len: the size of the free space. that we find, or the size of the max | |
826 | * free space if we don't find suitable free space | |
827 | * | |
0b86a832 CM |
828 | * this uses a pretty simple search, the expectation is that it is |
829 | * called very infrequently and that a given device has a small number | |
830 | * of extents | |
7bfc837d MX |
831 | * |
832 | * @start is used to store the start of the free space if we find. But if we | |
833 | * don't find suitable free space, it will be used to store the start position | |
834 | * of the max free space. | |
835 | * | |
836 | * @len is used to store the size of the free space that we find. | |
837 | * But if we don't find suitable free space, it is used to store the size of | |
838 | * the max free space. | |
0b86a832 | 839 | */ |
ba1bf481 JB |
840 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
841 | struct btrfs_device *device, u64 num_bytes, | |
7bfc837d | 842 | u64 *start, u64 *len) |
0b86a832 CM |
843 | { |
844 | struct btrfs_key key; | |
845 | struct btrfs_root *root = device->dev_root; | |
7bfc837d | 846 | struct btrfs_dev_extent *dev_extent; |
2b82032c | 847 | struct btrfs_path *path; |
7bfc837d MX |
848 | u64 hole_size; |
849 | u64 max_hole_start; | |
850 | u64 max_hole_size; | |
851 | u64 extent_end; | |
852 | u64 search_start; | |
0b86a832 CM |
853 | u64 search_end = device->total_bytes; |
854 | int ret; | |
7bfc837d | 855 | int slot; |
0b86a832 CM |
856 | struct extent_buffer *l; |
857 | ||
0b86a832 CM |
858 | /* FIXME use last free of some kind */ |
859 | ||
8a4b83cc CM |
860 | /* we don't want to overwrite the superblock on the drive, |
861 | * so we make sure to start at an offset of at least 1MB | |
862 | */ | |
7bfc837d | 863 | search_start = 1024 * 1024; |
8f18cf13 | 864 | |
7bfc837d | 865 | if (root->fs_info->alloc_start + num_bytes <= search_end) |
8f18cf13 CM |
866 | search_start = max(root->fs_info->alloc_start, search_start); |
867 | ||
7bfc837d MX |
868 | max_hole_start = search_start; |
869 | max_hole_size = 0; | |
870 | ||
871 | if (search_start >= search_end) { | |
872 | ret = -ENOSPC; | |
873 | goto error; | |
874 | } | |
875 | ||
876 | path = btrfs_alloc_path(); | |
877 | if (!path) { | |
878 | ret = -ENOMEM; | |
879 | goto error; | |
880 | } | |
881 | path->reada = 2; | |
882 | ||
0b86a832 CM |
883 | key.objectid = device->devid; |
884 | key.offset = search_start; | |
885 | key.type = BTRFS_DEV_EXTENT_KEY; | |
7bfc837d | 886 | |
0b86a832 CM |
887 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); |
888 | if (ret < 0) | |
7bfc837d | 889 | goto out; |
1fcbac58 YZ |
890 | if (ret > 0) { |
891 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
892 | if (ret < 0) | |
7bfc837d | 893 | goto out; |
1fcbac58 | 894 | } |
7bfc837d | 895 | |
0b86a832 CM |
896 | while (1) { |
897 | l = path->nodes[0]; | |
898 | slot = path->slots[0]; | |
899 | if (slot >= btrfs_header_nritems(l)) { | |
900 | ret = btrfs_next_leaf(root, path); | |
901 | if (ret == 0) | |
902 | continue; | |
903 | if (ret < 0) | |
7bfc837d MX |
904 | goto out; |
905 | ||
906 | break; | |
0b86a832 CM |
907 | } |
908 | btrfs_item_key_to_cpu(l, &key, slot); | |
909 | ||
910 | if (key.objectid < device->devid) | |
911 | goto next; | |
912 | ||
913 | if (key.objectid > device->devid) | |
7bfc837d | 914 | break; |
0b86a832 | 915 | |
7bfc837d MX |
916 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) |
917 | goto next; | |
9779b72f | 918 | |
7bfc837d MX |
919 | if (key.offset > search_start) { |
920 | hole_size = key.offset - search_start; | |
9779b72f | 921 | |
7bfc837d MX |
922 | if (hole_size > max_hole_size) { |
923 | max_hole_start = search_start; | |
924 | max_hole_size = hole_size; | |
925 | } | |
9779b72f | 926 | |
7bfc837d MX |
927 | /* |
928 | * If this free space is greater than which we need, | |
929 | * it must be the max free space that we have found | |
930 | * until now, so max_hole_start must point to the start | |
931 | * of this free space and the length of this free space | |
932 | * is stored in max_hole_size. Thus, we return | |
933 | * max_hole_start and max_hole_size and go back to the | |
934 | * caller. | |
935 | */ | |
936 | if (hole_size >= num_bytes) { | |
937 | ret = 0; | |
938 | goto out; | |
0b86a832 CM |
939 | } |
940 | } | |
0b86a832 | 941 | |
0b86a832 | 942 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
7bfc837d MX |
943 | extent_end = key.offset + btrfs_dev_extent_length(l, |
944 | dev_extent); | |
945 | if (extent_end > search_start) | |
946 | search_start = extent_end; | |
0b86a832 CM |
947 | next: |
948 | path->slots[0]++; | |
949 | cond_resched(); | |
950 | } | |
0b86a832 | 951 | |
7bfc837d MX |
952 | hole_size = search_end- search_start; |
953 | if (hole_size > max_hole_size) { | |
954 | max_hole_start = search_start; | |
955 | max_hole_size = hole_size; | |
0b86a832 | 956 | } |
0b86a832 | 957 | |
7bfc837d MX |
958 | /* See above. */ |
959 | if (hole_size < num_bytes) | |
960 | ret = -ENOSPC; | |
961 | else | |
962 | ret = 0; | |
963 | ||
964 | out: | |
2b82032c | 965 | btrfs_free_path(path); |
7bfc837d MX |
966 | error: |
967 | *start = max_hole_start; | |
b2117a39 | 968 | if (len) |
7bfc837d | 969 | *len = max_hole_size; |
0b86a832 CM |
970 | return ret; |
971 | } | |
972 | ||
b2950863 | 973 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
974 | struct btrfs_device *device, |
975 | u64 start) | |
976 | { | |
977 | int ret; | |
978 | struct btrfs_path *path; | |
979 | struct btrfs_root *root = device->dev_root; | |
980 | struct btrfs_key key; | |
a061fc8d CM |
981 | struct btrfs_key found_key; |
982 | struct extent_buffer *leaf = NULL; | |
983 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
984 | |
985 | path = btrfs_alloc_path(); | |
986 | if (!path) | |
987 | return -ENOMEM; | |
988 | ||
989 | key.objectid = device->devid; | |
990 | key.offset = start; | |
991 | key.type = BTRFS_DEV_EXTENT_KEY; | |
992 | ||
993 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
a061fc8d CM |
994 | if (ret > 0) { |
995 | ret = btrfs_previous_item(root, path, key.objectid, | |
996 | BTRFS_DEV_EXTENT_KEY); | |
997 | BUG_ON(ret); | |
998 | leaf = path->nodes[0]; | |
999 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1000 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1001 | struct btrfs_dev_extent); | |
1002 | BUG_ON(found_key.offset > start || found_key.offset + | |
1003 | btrfs_dev_extent_length(leaf, extent) < start); | |
1004 | ret = 0; | |
1005 | } else if (ret == 0) { | |
1006 | leaf = path->nodes[0]; | |
1007 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1008 | struct btrfs_dev_extent); | |
1009 | } | |
8f18cf13 CM |
1010 | BUG_ON(ret); |
1011 | ||
dfe25020 CM |
1012 | if (device->bytes_used > 0) |
1013 | device->bytes_used -= btrfs_dev_extent_length(leaf, extent); | |
8f18cf13 CM |
1014 | ret = btrfs_del_item(trans, root, path); |
1015 | BUG_ON(ret); | |
1016 | ||
1017 | btrfs_free_path(path); | |
1018 | return ret; | |
1019 | } | |
1020 | ||
2b82032c | 1021 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
0b86a832 | 1022 | struct btrfs_device *device, |
e17cade2 | 1023 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 1024 | u64 chunk_offset, u64 start, u64 num_bytes) |
0b86a832 CM |
1025 | { |
1026 | int ret; | |
1027 | struct btrfs_path *path; | |
1028 | struct btrfs_root *root = device->dev_root; | |
1029 | struct btrfs_dev_extent *extent; | |
1030 | struct extent_buffer *leaf; | |
1031 | struct btrfs_key key; | |
1032 | ||
dfe25020 | 1033 | WARN_ON(!device->in_fs_metadata); |
0b86a832 CM |
1034 | path = btrfs_alloc_path(); |
1035 | if (!path) | |
1036 | return -ENOMEM; | |
1037 | ||
0b86a832 | 1038 | key.objectid = device->devid; |
2b82032c | 1039 | key.offset = start; |
0b86a832 CM |
1040 | key.type = BTRFS_DEV_EXTENT_KEY; |
1041 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1042 | sizeof(*extent)); | |
1043 | BUG_ON(ret); | |
1044 | ||
1045 | leaf = path->nodes[0]; | |
1046 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1047 | struct btrfs_dev_extent); | |
e17cade2 CM |
1048 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
1049 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
1050 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
1051 | ||
1052 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
1053 | (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), | |
1054 | BTRFS_UUID_SIZE); | |
1055 | ||
0b86a832 CM |
1056 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
1057 | btrfs_mark_buffer_dirty(leaf); | |
0b86a832 CM |
1058 | btrfs_free_path(path); |
1059 | return ret; | |
1060 | } | |
1061 | ||
a1b32a59 CM |
1062 | static noinline int find_next_chunk(struct btrfs_root *root, |
1063 | u64 objectid, u64 *offset) | |
0b86a832 CM |
1064 | { |
1065 | struct btrfs_path *path; | |
1066 | int ret; | |
1067 | struct btrfs_key key; | |
e17cade2 | 1068 | struct btrfs_chunk *chunk; |
0b86a832 CM |
1069 | struct btrfs_key found_key; |
1070 | ||
1071 | path = btrfs_alloc_path(); | |
1072 | BUG_ON(!path); | |
1073 | ||
e17cade2 | 1074 | key.objectid = objectid; |
0b86a832 CM |
1075 | key.offset = (u64)-1; |
1076 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1077 | ||
1078 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1079 | if (ret < 0) | |
1080 | goto error; | |
1081 | ||
1082 | BUG_ON(ret == 0); | |
1083 | ||
1084 | ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY); | |
1085 | if (ret) { | |
e17cade2 | 1086 | *offset = 0; |
0b86a832 CM |
1087 | } else { |
1088 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1089 | path->slots[0]); | |
e17cade2 CM |
1090 | if (found_key.objectid != objectid) |
1091 | *offset = 0; | |
1092 | else { | |
1093 | chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1094 | struct btrfs_chunk); | |
1095 | *offset = found_key.offset + | |
1096 | btrfs_chunk_length(path->nodes[0], chunk); | |
1097 | } | |
0b86a832 CM |
1098 | } |
1099 | ret = 0; | |
1100 | error: | |
1101 | btrfs_free_path(path); | |
1102 | return ret; | |
1103 | } | |
1104 | ||
2b82032c | 1105 | static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid) |
0b86a832 CM |
1106 | { |
1107 | int ret; | |
1108 | struct btrfs_key key; | |
1109 | struct btrfs_key found_key; | |
2b82032c YZ |
1110 | struct btrfs_path *path; |
1111 | ||
1112 | root = root->fs_info->chunk_root; | |
1113 | ||
1114 | path = btrfs_alloc_path(); | |
1115 | if (!path) | |
1116 | return -ENOMEM; | |
0b86a832 CM |
1117 | |
1118 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1119 | key.type = BTRFS_DEV_ITEM_KEY; | |
1120 | key.offset = (u64)-1; | |
1121 | ||
1122 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1123 | if (ret < 0) | |
1124 | goto error; | |
1125 | ||
1126 | BUG_ON(ret == 0); | |
1127 | ||
1128 | ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID, | |
1129 | BTRFS_DEV_ITEM_KEY); | |
1130 | if (ret) { | |
1131 | *objectid = 1; | |
1132 | } else { | |
1133 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1134 | path->slots[0]); | |
1135 | *objectid = found_key.offset + 1; | |
1136 | } | |
1137 | ret = 0; | |
1138 | error: | |
2b82032c | 1139 | btrfs_free_path(path); |
0b86a832 CM |
1140 | return ret; |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * the device information is stored in the chunk root | |
1145 | * the btrfs_device struct should be fully filled in | |
1146 | */ | |
1147 | int btrfs_add_device(struct btrfs_trans_handle *trans, | |
1148 | struct btrfs_root *root, | |
1149 | struct btrfs_device *device) | |
1150 | { | |
1151 | int ret; | |
1152 | struct btrfs_path *path; | |
1153 | struct btrfs_dev_item *dev_item; | |
1154 | struct extent_buffer *leaf; | |
1155 | struct btrfs_key key; | |
1156 | unsigned long ptr; | |
0b86a832 CM |
1157 | |
1158 | root = root->fs_info->chunk_root; | |
1159 | ||
1160 | path = btrfs_alloc_path(); | |
1161 | if (!path) | |
1162 | return -ENOMEM; | |
1163 | ||
0b86a832 CM |
1164 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1165 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 1166 | key.offset = device->devid; |
0b86a832 CM |
1167 | |
1168 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 1169 | sizeof(*dev_item)); |
0b86a832 CM |
1170 | if (ret) |
1171 | goto out; | |
1172 | ||
1173 | leaf = path->nodes[0]; | |
1174 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1175 | ||
1176 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 1177 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
1178 | btrfs_set_device_type(leaf, dev_item, device->type); |
1179 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1180 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1181 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
1182 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
1183 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
e17cade2 CM |
1184 | btrfs_set_device_group(leaf, dev_item, 0); |
1185 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
1186 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 1187 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 1188 | |
0b86a832 | 1189 | ptr = (unsigned long)btrfs_device_uuid(dev_item); |
e17cade2 | 1190 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
2b82032c YZ |
1191 | ptr = (unsigned long)btrfs_device_fsid(dev_item); |
1192 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); | |
0b86a832 | 1193 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 1194 | |
2b82032c | 1195 | ret = 0; |
0b86a832 CM |
1196 | out: |
1197 | btrfs_free_path(path); | |
1198 | return ret; | |
1199 | } | |
8f18cf13 | 1200 | |
a061fc8d CM |
1201 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
1202 | struct btrfs_device *device) | |
1203 | { | |
1204 | int ret; | |
1205 | struct btrfs_path *path; | |
a061fc8d | 1206 | struct btrfs_key key; |
a061fc8d CM |
1207 | struct btrfs_trans_handle *trans; |
1208 | ||
1209 | root = root->fs_info->chunk_root; | |
1210 | ||
1211 | path = btrfs_alloc_path(); | |
1212 | if (!path) | |
1213 | return -ENOMEM; | |
1214 | ||
a22285a6 | 1215 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1216 | if (IS_ERR(trans)) { |
1217 | btrfs_free_path(path); | |
1218 | return PTR_ERR(trans); | |
1219 | } | |
a061fc8d CM |
1220 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1221 | key.type = BTRFS_DEV_ITEM_KEY; | |
1222 | key.offset = device->devid; | |
7d9eb12c | 1223 | lock_chunks(root); |
a061fc8d CM |
1224 | |
1225 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1226 | if (ret < 0) | |
1227 | goto out; | |
1228 | ||
1229 | if (ret > 0) { | |
1230 | ret = -ENOENT; | |
1231 | goto out; | |
1232 | } | |
1233 | ||
1234 | ret = btrfs_del_item(trans, root, path); | |
1235 | if (ret) | |
1236 | goto out; | |
a061fc8d CM |
1237 | out: |
1238 | btrfs_free_path(path); | |
7d9eb12c | 1239 | unlock_chunks(root); |
a061fc8d CM |
1240 | btrfs_commit_transaction(trans, root); |
1241 | return ret; | |
1242 | } | |
1243 | ||
1244 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
1245 | { | |
1246 | struct btrfs_device *device; | |
2b82032c | 1247 | struct btrfs_device *next_device; |
a061fc8d | 1248 | struct block_device *bdev; |
dfe25020 | 1249 | struct buffer_head *bh = NULL; |
a061fc8d CM |
1250 | struct btrfs_super_block *disk_super; |
1251 | u64 all_avail; | |
1252 | u64 devid; | |
2b82032c YZ |
1253 | u64 num_devices; |
1254 | u8 *dev_uuid; | |
a061fc8d CM |
1255 | int ret = 0; |
1256 | ||
a061fc8d | 1257 | mutex_lock(&uuid_mutex); |
7d9eb12c | 1258 | mutex_lock(&root->fs_info->volume_mutex); |
a061fc8d CM |
1259 | |
1260 | all_avail = root->fs_info->avail_data_alloc_bits | | |
1261 | root->fs_info->avail_system_alloc_bits | | |
1262 | root->fs_info->avail_metadata_alloc_bits; | |
1263 | ||
1264 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && | |
035fe03a | 1265 | root->fs_info->fs_devices->num_devices <= 4) { |
d397712b CM |
1266 | printk(KERN_ERR "btrfs: unable to go below four devices " |
1267 | "on raid10\n"); | |
a061fc8d CM |
1268 | ret = -EINVAL; |
1269 | goto out; | |
1270 | } | |
1271 | ||
1272 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && | |
035fe03a | 1273 | root->fs_info->fs_devices->num_devices <= 2) { |
d397712b CM |
1274 | printk(KERN_ERR "btrfs: unable to go below two " |
1275 | "devices on raid1\n"); | |
a061fc8d CM |
1276 | ret = -EINVAL; |
1277 | goto out; | |
1278 | } | |
1279 | ||
dfe25020 | 1280 | if (strcmp(device_path, "missing") == 0) { |
dfe25020 CM |
1281 | struct list_head *devices; |
1282 | struct btrfs_device *tmp; | |
a061fc8d | 1283 | |
dfe25020 CM |
1284 | device = NULL; |
1285 | devices = &root->fs_info->fs_devices->devices; | |
e5e9a520 | 1286 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
c6e30871 | 1287 | list_for_each_entry(tmp, devices, dev_list) { |
dfe25020 CM |
1288 | if (tmp->in_fs_metadata && !tmp->bdev) { |
1289 | device = tmp; | |
1290 | break; | |
1291 | } | |
1292 | } | |
e5e9a520 | 1293 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
dfe25020 CM |
1294 | bdev = NULL; |
1295 | bh = NULL; | |
1296 | disk_super = NULL; | |
1297 | if (!device) { | |
d397712b CM |
1298 | printk(KERN_ERR "btrfs: no missing devices found to " |
1299 | "remove\n"); | |
dfe25020 CM |
1300 | goto out; |
1301 | } | |
dfe25020 | 1302 | } else { |
d4d77629 TH |
1303 | bdev = blkdev_get_by_path(device_path, FMODE_READ | FMODE_EXCL, |
1304 | root->fs_info->bdev_holder); | |
dfe25020 CM |
1305 | if (IS_ERR(bdev)) { |
1306 | ret = PTR_ERR(bdev); | |
1307 | goto out; | |
1308 | } | |
a061fc8d | 1309 | |
2b82032c | 1310 | set_blocksize(bdev, 4096); |
a512bbf8 | 1311 | bh = btrfs_read_dev_super(bdev); |
dfe25020 | 1312 | if (!bh) { |
20b45077 | 1313 | ret = -EINVAL; |
dfe25020 CM |
1314 | goto error_close; |
1315 | } | |
1316 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 1317 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
2b82032c YZ |
1318 | dev_uuid = disk_super->dev_item.uuid; |
1319 | device = btrfs_find_device(root, devid, dev_uuid, | |
1320 | disk_super->fsid); | |
dfe25020 CM |
1321 | if (!device) { |
1322 | ret = -ENOENT; | |
1323 | goto error_brelse; | |
1324 | } | |
2b82032c | 1325 | } |
dfe25020 | 1326 | |
2b82032c | 1327 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
d397712b CM |
1328 | printk(KERN_ERR "btrfs: unable to remove the only writeable " |
1329 | "device\n"); | |
2b82032c YZ |
1330 | ret = -EINVAL; |
1331 | goto error_brelse; | |
1332 | } | |
1333 | ||
1334 | if (device->writeable) { | |
1335 | list_del_init(&device->dev_alloc_list); | |
1336 | root->fs_info->fs_devices->rw_devices--; | |
dfe25020 | 1337 | } |
a061fc8d CM |
1338 | |
1339 | ret = btrfs_shrink_device(device, 0); | |
1340 | if (ret) | |
1341 | goto error_brelse; | |
1342 | ||
a061fc8d CM |
1343 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
1344 | if (ret) | |
1345 | goto error_brelse; | |
1346 | ||
2b82032c | 1347 | device->in_fs_metadata = 0; |
e5e9a520 CM |
1348 | |
1349 | /* | |
1350 | * the device list mutex makes sure that we don't change | |
1351 | * the device list while someone else is writing out all | |
1352 | * the device supers. | |
1353 | */ | |
1354 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
e4404d6e | 1355 | list_del_init(&device->dev_list); |
e5e9a520 CM |
1356 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
1357 | ||
e4404d6e | 1358 | device->fs_devices->num_devices--; |
2b82032c | 1359 | |
cd02dca5 CM |
1360 | if (device->missing) |
1361 | root->fs_info->fs_devices->missing_devices--; | |
1362 | ||
2b82032c YZ |
1363 | next_device = list_entry(root->fs_info->fs_devices->devices.next, |
1364 | struct btrfs_device, dev_list); | |
1365 | if (device->bdev == root->fs_info->sb->s_bdev) | |
1366 | root->fs_info->sb->s_bdev = next_device->bdev; | |
1367 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) | |
1368 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1369 | ||
e4404d6e | 1370 | if (device->bdev) { |
d4d77629 | 1371 | blkdev_put(device->bdev, device->mode); |
e4404d6e YZ |
1372 | device->bdev = NULL; |
1373 | device->fs_devices->open_devices--; | |
1374 | } | |
1375 | ||
2b82032c YZ |
1376 | num_devices = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
1377 | btrfs_set_super_num_devices(&root->fs_info->super_copy, num_devices); | |
1378 | ||
e4404d6e YZ |
1379 | if (device->fs_devices->open_devices == 0) { |
1380 | struct btrfs_fs_devices *fs_devices; | |
1381 | fs_devices = root->fs_info->fs_devices; | |
1382 | while (fs_devices) { | |
1383 | if (fs_devices->seed == device->fs_devices) | |
1384 | break; | |
1385 | fs_devices = fs_devices->seed; | |
2b82032c | 1386 | } |
e4404d6e YZ |
1387 | fs_devices->seed = device->fs_devices->seed; |
1388 | device->fs_devices->seed = NULL; | |
1389 | __btrfs_close_devices(device->fs_devices); | |
1390 | free_fs_devices(device->fs_devices); | |
2b82032c YZ |
1391 | } |
1392 | ||
1393 | /* | |
1394 | * at this point, the device is zero sized. We want to | |
1395 | * remove it from the devices list and zero out the old super | |
1396 | */ | |
1397 | if (device->writeable) { | |
dfe25020 CM |
1398 | /* make sure this device isn't detected as part of |
1399 | * the FS anymore | |
1400 | */ | |
1401 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
1402 | set_buffer_dirty(bh); | |
1403 | sync_dirty_buffer(bh); | |
dfe25020 | 1404 | } |
a061fc8d CM |
1405 | |
1406 | kfree(device->name); | |
1407 | kfree(device); | |
1408 | ret = 0; | |
a061fc8d CM |
1409 | |
1410 | error_brelse: | |
1411 | brelse(bh); | |
1412 | error_close: | |
dfe25020 | 1413 | if (bdev) |
e525fd89 | 1414 | blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
a061fc8d | 1415 | out: |
7d9eb12c | 1416 | mutex_unlock(&root->fs_info->volume_mutex); |
a061fc8d | 1417 | mutex_unlock(&uuid_mutex); |
a061fc8d CM |
1418 | return ret; |
1419 | } | |
1420 | ||
2b82032c YZ |
1421 | /* |
1422 | * does all the dirty work required for changing file system's UUID. | |
1423 | */ | |
1424 | static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans, | |
1425 | struct btrfs_root *root) | |
1426 | { | |
1427 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
1428 | struct btrfs_fs_devices *old_devices; | |
e4404d6e | 1429 | struct btrfs_fs_devices *seed_devices; |
2b82032c YZ |
1430 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
1431 | struct btrfs_device *device; | |
1432 | u64 super_flags; | |
1433 | ||
1434 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 1435 | if (!fs_devices->seeding) |
2b82032c YZ |
1436 | return -EINVAL; |
1437 | ||
e4404d6e YZ |
1438 | seed_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
1439 | if (!seed_devices) | |
2b82032c YZ |
1440 | return -ENOMEM; |
1441 | ||
e4404d6e YZ |
1442 | old_devices = clone_fs_devices(fs_devices); |
1443 | if (IS_ERR(old_devices)) { | |
1444 | kfree(seed_devices); | |
1445 | return PTR_ERR(old_devices); | |
2b82032c | 1446 | } |
e4404d6e | 1447 | |
2b82032c YZ |
1448 | list_add(&old_devices->list, &fs_uuids); |
1449 | ||
e4404d6e YZ |
1450 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
1451 | seed_devices->opened = 1; | |
1452 | INIT_LIST_HEAD(&seed_devices->devices); | |
1453 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
e5e9a520 | 1454 | mutex_init(&seed_devices->device_list_mutex); |
e4404d6e YZ |
1455 | list_splice_init(&fs_devices->devices, &seed_devices->devices); |
1456 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); | |
1457 | list_for_each_entry(device, &seed_devices->devices, dev_list) { | |
1458 | device->fs_devices = seed_devices; | |
1459 | } | |
1460 | ||
2b82032c YZ |
1461 | fs_devices->seeding = 0; |
1462 | fs_devices->num_devices = 0; | |
1463 | fs_devices->open_devices = 0; | |
e4404d6e | 1464 | fs_devices->seed = seed_devices; |
2b82032c YZ |
1465 | |
1466 | generate_random_uuid(fs_devices->fsid); | |
1467 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1468 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1469 | super_flags = btrfs_super_flags(disk_super) & | |
1470 | ~BTRFS_SUPER_FLAG_SEEDING; | |
1471 | btrfs_set_super_flags(disk_super, super_flags); | |
1472 | ||
1473 | return 0; | |
1474 | } | |
1475 | ||
1476 | /* | |
1477 | * strore the expected generation for seed devices in device items. | |
1478 | */ | |
1479 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
1480 | struct btrfs_root *root) | |
1481 | { | |
1482 | struct btrfs_path *path; | |
1483 | struct extent_buffer *leaf; | |
1484 | struct btrfs_dev_item *dev_item; | |
1485 | struct btrfs_device *device; | |
1486 | struct btrfs_key key; | |
1487 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
1488 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
1489 | u64 devid; | |
1490 | int ret; | |
1491 | ||
1492 | path = btrfs_alloc_path(); | |
1493 | if (!path) | |
1494 | return -ENOMEM; | |
1495 | ||
1496 | root = root->fs_info->chunk_root; | |
1497 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1498 | key.offset = 0; | |
1499 | key.type = BTRFS_DEV_ITEM_KEY; | |
1500 | ||
1501 | while (1) { | |
1502 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1503 | if (ret < 0) | |
1504 | goto error; | |
1505 | ||
1506 | leaf = path->nodes[0]; | |
1507 | next_slot: | |
1508 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1509 | ret = btrfs_next_leaf(root, path); | |
1510 | if (ret > 0) | |
1511 | break; | |
1512 | if (ret < 0) | |
1513 | goto error; | |
1514 | leaf = path->nodes[0]; | |
1515 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1516 | btrfs_release_path(root, path); | |
1517 | continue; | |
1518 | } | |
1519 | ||
1520 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1521 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
1522 | key.type != BTRFS_DEV_ITEM_KEY) | |
1523 | break; | |
1524 | ||
1525 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
1526 | struct btrfs_dev_item); | |
1527 | devid = btrfs_device_id(leaf, dev_item); | |
1528 | read_extent_buffer(leaf, dev_uuid, | |
1529 | (unsigned long)btrfs_device_uuid(dev_item), | |
1530 | BTRFS_UUID_SIZE); | |
1531 | read_extent_buffer(leaf, fs_uuid, | |
1532 | (unsigned long)btrfs_device_fsid(dev_item), | |
1533 | BTRFS_UUID_SIZE); | |
1534 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
1535 | BUG_ON(!device); | |
1536 | ||
1537 | if (device->fs_devices->seeding) { | |
1538 | btrfs_set_device_generation(leaf, dev_item, | |
1539 | device->generation); | |
1540 | btrfs_mark_buffer_dirty(leaf); | |
1541 | } | |
1542 | ||
1543 | path->slots[0]++; | |
1544 | goto next_slot; | |
1545 | } | |
1546 | ret = 0; | |
1547 | error: | |
1548 | btrfs_free_path(path); | |
1549 | return ret; | |
1550 | } | |
1551 | ||
788f20eb CM |
1552 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
1553 | { | |
1554 | struct btrfs_trans_handle *trans; | |
1555 | struct btrfs_device *device; | |
1556 | struct block_device *bdev; | |
788f20eb | 1557 | struct list_head *devices; |
2b82032c | 1558 | struct super_block *sb = root->fs_info->sb; |
788f20eb | 1559 | u64 total_bytes; |
2b82032c | 1560 | int seeding_dev = 0; |
788f20eb CM |
1561 | int ret = 0; |
1562 | ||
2b82032c YZ |
1563 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
1564 | return -EINVAL; | |
788f20eb | 1565 | |
d4d77629 TH |
1566 | bdev = blkdev_get_by_path(device_path, FMODE_EXCL, |
1567 | root->fs_info->bdev_holder); | |
7f59203a JB |
1568 | if (IS_ERR(bdev)) |
1569 | return PTR_ERR(bdev); | |
a2135011 | 1570 | |
2b82032c YZ |
1571 | if (root->fs_info->fs_devices->seeding) { |
1572 | seeding_dev = 1; | |
1573 | down_write(&sb->s_umount); | |
1574 | mutex_lock(&uuid_mutex); | |
1575 | } | |
1576 | ||
8c8bee1d | 1577 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
7d9eb12c | 1578 | mutex_lock(&root->fs_info->volume_mutex); |
a2135011 | 1579 | |
788f20eb | 1580 | devices = &root->fs_info->fs_devices->devices; |
e5e9a520 CM |
1581 | /* |
1582 | * we have the volume lock, so we don't need the extra | |
1583 | * device list mutex while reading the list here. | |
1584 | */ | |
c6e30871 | 1585 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
1586 | if (device->bdev == bdev) { |
1587 | ret = -EEXIST; | |
2b82032c | 1588 | goto error; |
788f20eb CM |
1589 | } |
1590 | } | |
1591 | ||
1592 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
1593 | if (!device) { | |
1594 | /* we can safely leave the fs_devices entry around */ | |
1595 | ret = -ENOMEM; | |
2b82032c | 1596 | goto error; |
788f20eb CM |
1597 | } |
1598 | ||
788f20eb CM |
1599 | device->name = kstrdup(device_path, GFP_NOFS); |
1600 | if (!device->name) { | |
1601 | kfree(device); | |
2b82032c YZ |
1602 | ret = -ENOMEM; |
1603 | goto error; | |
788f20eb | 1604 | } |
2b82032c YZ |
1605 | |
1606 | ret = find_next_devid(root, &device->devid); | |
1607 | if (ret) { | |
67100f25 | 1608 | kfree(device->name); |
2b82032c YZ |
1609 | kfree(device); |
1610 | goto error; | |
1611 | } | |
1612 | ||
a22285a6 | 1613 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 1614 | if (IS_ERR(trans)) { |
67100f25 | 1615 | kfree(device->name); |
98d5dc13 TI |
1616 | kfree(device); |
1617 | ret = PTR_ERR(trans); | |
1618 | goto error; | |
1619 | } | |
1620 | ||
2b82032c YZ |
1621 | lock_chunks(root); |
1622 | ||
2b82032c YZ |
1623 | device->writeable = 1; |
1624 | device->work.func = pending_bios_fn; | |
1625 | generate_random_uuid(device->uuid); | |
1626 | spin_lock_init(&device->io_lock); | |
1627 | device->generation = trans->transid; | |
788f20eb CM |
1628 | device->io_width = root->sectorsize; |
1629 | device->io_align = root->sectorsize; | |
1630 | device->sector_size = root->sectorsize; | |
1631 | device->total_bytes = i_size_read(bdev->bd_inode); | |
2cc3c559 | 1632 | device->disk_total_bytes = device->total_bytes; |
788f20eb CM |
1633 | device->dev_root = root->fs_info->dev_root; |
1634 | device->bdev = bdev; | |
dfe25020 | 1635 | device->in_fs_metadata = 1; |
15916de8 | 1636 | device->mode = 0; |
2b82032c | 1637 | set_blocksize(device->bdev, 4096); |
788f20eb | 1638 | |
2b82032c YZ |
1639 | if (seeding_dev) { |
1640 | sb->s_flags &= ~MS_RDONLY; | |
1641 | ret = btrfs_prepare_sprout(trans, root); | |
1642 | BUG_ON(ret); | |
1643 | } | |
788f20eb | 1644 | |
2b82032c | 1645 | device->fs_devices = root->fs_info->fs_devices; |
e5e9a520 CM |
1646 | |
1647 | /* | |
1648 | * we don't want write_supers to jump in here with our device | |
1649 | * half setup | |
1650 | */ | |
1651 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2b82032c YZ |
1652 | list_add(&device->dev_list, &root->fs_info->fs_devices->devices); |
1653 | list_add(&device->dev_alloc_list, | |
1654 | &root->fs_info->fs_devices->alloc_list); | |
1655 | root->fs_info->fs_devices->num_devices++; | |
1656 | root->fs_info->fs_devices->open_devices++; | |
1657 | root->fs_info->fs_devices->rw_devices++; | |
1658 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; | |
325cd4ba | 1659 | |
c289811c CM |
1660 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
1661 | root->fs_info->fs_devices->rotating = 1; | |
1662 | ||
788f20eb CM |
1663 | total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
1664 | btrfs_set_super_total_bytes(&root->fs_info->super_copy, | |
1665 | total_bytes + device->total_bytes); | |
1666 | ||
1667 | total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy); | |
1668 | btrfs_set_super_num_devices(&root->fs_info->super_copy, | |
1669 | total_bytes + 1); | |
e5e9a520 | 1670 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 1671 | |
2b82032c YZ |
1672 | if (seeding_dev) { |
1673 | ret = init_first_rw_device(trans, root, device); | |
1674 | BUG_ON(ret); | |
1675 | ret = btrfs_finish_sprout(trans, root); | |
1676 | BUG_ON(ret); | |
1677 | } else { | |
1678 | ret = btrfs_add_device(trans, root, device); | |
1679 | } | |
1680 | ||
913d952e CM |
1681 | /* |
1682 | * we've got more storage, clear any full flags on the space | |
1683 | * infos | |
1684 | */ | |
1685 | btrfs_clear_space_info_full(root->fs_info); | |
1686 | ||
7d9eb12c | 1687 | unlock_chunks(root); |
2b82032c | 1688 | btrfs_commit_transaction(trans, root); |
a2135011 | 1689 | |
2b82032c YZ |
1690 | if (seeding_dev) { |
1691 | mutex_unlock(&uuid_mutex); | |
1692 | up_write(&sb->s_umount); | |
788f20eb | 1693 | |
2b82032c YZ |
1694 | ret = btrfs_relocate_sys_chunks(root); |
1695 | BUG_ON(ret); | |
1696 | } | |
1697 | out: | |
1698 | mutex_unlock(&root->fs_info->volume_mutex); | |
1699 | return ret; | |
1700 | error: | |
e525fd89 | 1701 | blkdev_put(bdev, FMODE_EXCL); |
2b82032c YZ |
1702 | if (seeding_dev) { |
1703 | mutex_unlock(&uuid_mutex); | |
1704 | up_write(&sb->s_umount); | |
1705 | } | |
788f20eb CM |
1706 | goto out; |
1707 | } | |
1708 | ||
d397712b CM |
1709 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
1710 | struct btrfs_device *device) | |
0b86a832 CM |
1711 | { |
1712 | int ret; | |
1713 | struct btrfs_path *path; | |
1714 | struct btrfs_root *root; | |
1715 | struct btrfs_dev_item *dev_item; | |
1716 | struct extent_buffer *leaf; | |
1717 | struct btrfs_key key; | |
1718 | ||
1719 | root = device->dev_root->fs_info->chunk_root; | |
1720 | ||
1721 | path = btrfs_alloc_path(); | |
1722 | if (!path) | |
1723 | return -ENOMEM; | |
1724 | ||
1725 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1726 | key.type = BTRFS_DEV_ITEM_KEY; | |
1727 | key.offset = device->devid; | |
1728 | ||
1729 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1730 | if (ret < 0) | |
1731 | goto out; | |
1732 | ||
1733 | if (ret > 0) { | |
1734 | ret = -ENOENT; | |
1735 | goto out; | |
1736 | } | |
1737 | ||
1738 | leaf = path->nodes[0]; | |
1739 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1740 | ||
1741 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
1742 | btrfs_set_device_type(leaf, dev_item, device->type); | |
1743 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1744 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1745 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
d6397bae | 1746 | btrfs_set_device_total_bytes(leaf, dev_item, device->disk_total_bytes); |
0b86a832 CM |
1747 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); |
1748 | btrfs_mark_buffer_dirty(leaf); | |
1749 | ||
1750 | out: | |
1751 | btrfs_free_path(path); | |
1752 | return ret; | |
1753 | } | |
1754 | ||
7d9eb12c | 1755 | static int __btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
1756 | struct btrfs_device *device, u64 new_size) |
1757 | { | |
1758 | struct btrfs_super_block *super_copy = | |
1759 | &device->dev_root->fs_info->super_copy; | |
1760 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
1761 | u64 diff = new_size - device->total_bytes; | |
1762 | ||
2b82032c YZ |
1763 | if (!device->writeable) |
1764 | return -EACCES; | |
1765 | if (new_size <= device->total_bytes) | |
1766 | return -EINVAL; | |
1767 | ||
8f18cf13 | 1768 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
2b82032c YZ |
1769 | device->fs_devices->total_rw_bytes += diff; |
1770 | ||
1771 | device->total_bytes = new_size; | |
9779b72f | 1772 | device->disk_total_bytes = new_size; |
4184ea7f CM |
1773 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
1774 | ||
8f18cf13 CM |
1775 | return btrfs_update_device(trans, device); |
1776 | } | |
1777 | ||
7d9eb12c CM |
1778 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
1779 | struct btrfs_device *device, u64 new_size) | |
1780 | { | |
1781 | int ret; | |
1782 | lock_chunks(device->dev_root); | |
1783 | ret = __btrfs_grow_device(trans, device, new_size); | |
1784 | unlock_chunks(device->dev_root); | |
1785 | return ret; | |
1786 | } | |
1787 | ||
8f18cf13 CM |
1788 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, |
1789 | struct btrfs_root *root, | |
1790 | u64 chunk_tree, u64 chunk_objectid, | |
1791 | u64 chunk_offset) | |
1792 | { | |
1793 | int ret; | |
1794 | struct btrfs_path *path; | |
1795 | struct btrfs_key key; | |
1796 | ||
1797 | root = root->fs_info->chunk_root; | |
1798 | path = btrfs_alloc_path(); | |
1799 | if (!path) | |
1800 | return -ENOMEM; | |
1801 | ||
1802 | key.objectid = chunk_objectid; | |
1803 | key.offset = chunk_offset; | |
1804 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1805 | ||
1806 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1807 | BUG_ON(ret); | |
1808 | ||
1809 | ret = btrfs_del_item(trans, root, path); | |
1810 | BUG_ON(ret); | |
1811 | ||
1812 | btrfs_free_path(path); | |
1813 | return 0; | |
1814 | } | |
1815 | ||
b2950863 | 1816 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
8f18cf13 CM |
1817 | chunk_offset) |
1818 | { | |
1819 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
1820 | struct btrfs_disk_key *disk_key; | |
1821 | struct btrfs_chunk *chunk; | |
1822 | u8 *ptr; | |
1823 | int ret = 0; | |
1824 | u32 num_stripes; | |
1825 | u32 array_size; | |
1826 | u32 len = 0; | |
1827 | u32 cur; | |
1828 | struct btrfs_key key; | |
1829 | ||
1830 | array_size = btrfs_super_sys_array_size(super_copy); | |
1831 | ||
1832 | ptr = super_copy->sys_chunk_array; | |
1833 | cur = 0; | |
1834 | ||
1835 | while (cur < array_size) { | |
1836 | disk_key = (struct btrfs_disk_key *)ptr; | |
1837 | btrfs_disk_key_to_cpu(&key, disk_key); | |
1838 | ||
1839 | len = sizeof(*disk_key); | |
1840 | ||
1841 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
1842 | chunk = (struct btrfs_chunk *)(ptr + len); | |
1843 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
1844 | len += btrfs_chunk_item_size(num_stripes); | |
1845 | } else { | |
1846 | ret = -EIO; | |
1847 | break; | |
1848 | } | |
1849 | if (key.objectid == chunk_objectid && | |
1850 | key.offset == chunk_offset) { | |
1851 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
1852 | array_size -= len; | |
1853 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
1854 | } else { | |
1855 | ptr += len; | |
1856 | cur += len; | |
1857 | } | |
1858 | } | |
1859 | return ret; | |
1860 | } | |
1861 | ||
b2950863 | 1862 | static int btrfs_relocate_chunk(struct btrfs_root *root, |
8f18cf13 CM |
1863 | u64 chunk_tree, u64 chunk_objectid, |
1864 | u64 chunk_offset) | |
1865 | { | |
1866 | struct extent_map_tree *em_tree; | |
1867 | struct btrfs_root *extent_root; | |
1868 | struct btrfs_trans_handle *trans; | |
1869 | struct extent_map *em; | |
1870 | struct map_lookup *map; | |
1871 | int ret; | |
1872 | int i; | |
1873 | ||
1874 | root = root->fs_info->chunk_root; | |
1875 | extent_root = root->fs_info->extent_root; | |
1876 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
1877 | ||
ba1bf481 JB |
1878 | ret = btrfs_can_relocate(extent_root, chunk_offset); |
1879 | if (ret) | |
1880 | return -ENOSPC; | |
1881 | ||
8f18cf13 | 1882 | /* step one, relocate all the extents inside this chunk */ |
1a40e23b | 1883 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); |
a22285a6 YZ |
1884 | if (ret) |
1885 | return ret; | |
8f18cf13 | 1886 | |
a22285a6 | 1887 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 1888 | BUG_ON(IS_ERR(trans)); |
8f18cf13 | 1889 | |
7d9eb12c CM |
1890 | lock_chunks(root); |
1891 | ||
8f18cf13 CM |
1892 | /* |
1893 | * step two, delete the device extents and the | |
1894 | * chunk tree entries | |
1895 | */ | |
890871be | 1896 | read_lock(&em_tree->lock); |
8f18cf13 | 1897 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); |
890871be | 1898 | read_unlock(&em_tree->lock); |
8f18cf13 | 1899 | |
a061fc8d CM |
1900 | BUG_ON(em->start > chunk_offset || |
1901 | em->start + em->len < chunk_offset); | |
8f18cf13 CM |
1902 | map = (struct map_lookup *)em->bdev; |
1903 | ||
1904 | for (i = 0; i < map->num_stripes; i++) { | |
1905 | ret = btrfs_free_dev_extent(trans, map->stripes[i].dev, | |
1906 | map->stripes[i].physical); | |
1907 | BUG_ON(ret); | |
a061fc8d | 1908 | |
dfe25020 CM |
1909 | if (map->stripes[i].dev) { |
1910 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
1911 | BUG_ON(ret); | |
1912 | } | |
8f18cf13 CM |
1913 | } |
1914 | ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid, | |
1915 | chunk_offset); | |
1916 | ||
1917 | BUG_ON(ret); | |
1918 | ||
1919 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { | |
1920 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
1921 | BUG_ON(ret); | |
8f18cf13 CM |
1922 | } |
1923 | ||
2b82032c YZ |
1924 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset); |
1925 | BUG_ON(ret); | |
1926 | ||
890871be | 1927 | write_lock(&em_tree->lock); |
2b82032c | 1928 | remove_extent_mapping(em_tree, em); |
890871be | 1929 | write_unlock(&em_tree->lock); |
2b82032c YZ |
1930 | |
1931 | kfree(map); | |
1932 | em->bdev = NULL; | |
1933 | ||
1934 | /* once for the tree */ | |
1935 | free_extent_map(em); | |
1936 | /* once for us */ | |
1937 | free_extent_map(em); | |
1938 | ||
1939 | unlock_chunks(root); | |
1940 | btrfs_end_transaction(trans, root); | |
1941 | return 0; | |
1942 | } | |
1943 | ||
1944 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) | |
1945 | { | |
1946 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; | |
1947 | struct btrfs_path *path; | |
1948 | struct extent_buffer *leaf; | |
1949 | struct btrfs_chunk *chunk; | |
1950 | struct btrfs_key key; | |
1951 | struct btrfs_key found_key; | |
1952 | u64 chunk_tree = chunk_root->root_key.objectid; | |
1953 | u64 chunk_type; | |
ba1bf481 JB |
1954 | bool retried = false; |
1955 | int failed = 0; | |
2b82032c YZ |
1956 | int ret; |
1957 | ||
1958 | path = btrfs_alloc_path(); | |
1959 | if (!path) | |
1960 | return -ENOMEM; | |
1961 | ||
ba1bf481 | 1962 | again: |
2b82032c YZ |
1963 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
1964 | key.offset = (u64)-1; | |
1965 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1966 | ||
1967 | while (1) { | |
1968 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); | |
1969 | if (ret < 0) | |
1970 | goto error; | |
1971 | BUG_ON(ret == 0); | |
1972 | ||
1973 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
1974 | key.type); | |
1975 | if (ret < 0) | |
1976 | goto error; | |
1977 | if (ret > 0) | |
1978 | break; | |
1a40e23b | 1979 | |
2b82032c YZ |
1980 | leaf = path->nodes[0]; |
1981 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 1982 | |
2b82032c YZ |
1983 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
1984 | struct btrfs_chunk); | |
1985 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
1986 | btrfs_release_path(chunk_root, path); | |
8f18cf13 | 1987 | |
2b82032c YZ |
1988 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
1989 | ret = btrfs_relocate_chunk(chunk_root, chunk_tree, | |
1990 | found_key.objectid, | |
1991 | found_key.offset); | |
ba1bf481 JB |
1992 | if (ret == -ENOSPC) |
1993 | failed++; | |
1994 | else if (ret) | |
1995 | BUG(); | |
2b82032c | 1996 | } |
8f18cf13 | 1997 | |
2b82032c YZ |
1998 | if (found_key.offset == 0) |
1999 | break; | |
2000 | key.offset = found_key.offset - 1; | |
2001 | } | |
2002 | ret = 0; | |
ba1bf481 JB |
2003 | if (failed && !retried) { |
2004 | failed = 0; | |
2005 | retried = true; | |
2006 | goto again; | |
2007 | } else if (failed && retried) { | |
2008 | WARN_ON(1); | |
2009 | ret = -ENOSPC; | |
2010 | } | |
2b82032c YZ |
2011 | error: |
2012 | btrfs_free_path(path); | |
2013 | return ret; | |
8f18cf13 CM |
2014 | } |
2015 | ||
ec44a35c CM |
2016 | static u64 div_factor(u64 num, int factor) |
2017 | { | |
2018 | if (factor == 10) | |
2019 | return num; | |
2020 | num *= factor; | |
2021 | do_div(num, 10); | |
2022 | return num; | |
2023 | } | |
2024 | ||
ec44a35c CM |
2025 | int btrfs_balance(struct btrfs_root *dev_root) |
2026 | { | |
2027 | int ret; | |
ec44a35c CM |
2028 | struct list_head *devices = &dev_root->fs_info->fs_devices->devices; |
2029 | struct btrfs_device *device; | |
2030 | u64 old_size; | |
2031 | u64 size_to_free; | |
2032 | struct btrfs_path *path; | |
2033 | struct btrfs_key key; | |
ec44a35c CM |
2034 | struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root; |
2035 | struct btrfs_trans_handle *trans; | |
2036 | struct btrfs_key found_key; | |
2037 | ||
2b82032c YZ |
2038 | if (dev_root->fs_info->sb->s_flags & MS_RDONLY) |
2039 | return -EROFS; | |
ec44a35c | 2040 | |
6f88a440 BH |
2041 | if (!capable(CAP_SYS_ADMIN)) |
2042 | return -EPERM; | |
2043 | ||
7d9eb12c | 2044 | mutex_lock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
2045 | dev_root = dev_root->fs_info->dev_root; |
2046 | ||
ec44a35c | 2047 | /* step one make some room on all the devices */ |
c6e30871 | 2048 | list_for_each_entry(device, devices, dev_list) { |
ec44a35c CM |
2049 | old_size = device->total_bytes; |
2050 | size_to_free = div_factor(old_size, 1); | |
2051 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
2b82032c YZ |
2052 | if (!device->writeable || |
2053 | device->total_bytes - device->bytes_used > size_to_free) | |
ec44a35c CM |
2054 | continue; |
2055 | ||
2056 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
ba1bf481 JB |
2057 | if (ret == -ENOSPC) |
2058 | break; | |
ec44a35c CM |
2059 | BUG_ON(ret); |
2060 | ||
a22285a6 | 2061 | trans = btrfs_start_transaction(dev_root, 0); |
98d5dc13 | 2062 | BUG_ON(IS_ERR(trans)); |
ec44a35c CM |
2063 | |
2064 | ret = btrfs_grow_device(trans, device, old_size); | |
2065 | BUG_ON(ret); | |
2066 | ||
2067 | btrfs_end_transaction(trans, dev_root); | |
2068 | } | |
2069 | ||
2070 | /* step two, relocate all the chunks */ | |
2071 | path = btrfs_alloc_path(); | |
2072 | BUG_ON(!path); | |
2073 | ||
2074 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; | |
2075 | key.offset = (u64)-1; | |
2076 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2077 | ||
d397712b | 2078 | while (1) { |
ec44a35c CM |
2079 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
2080 | if (ret < 0) | |
2081 | goto error; | |
2082 | ||
2083 | /* | |
2084 | * this shouldn't happen, it means the last relocate | |
2085 | * failed | |
2086 | */ | |
2087 | if (ret == 0) | |
2088 | break; | |
2089 | ||
2090 | ret = btrfs_previous_item(chunk_root, path, 0, | |
2091 | BTRFS_CHUNK_ITEM_KEY); | |
7d9eb12c | 2092 | if (ret) |
ec44a35c | 2093 | break; |
7d9eb12c | 2094 | |
ec44a35c CM |
2095 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
2096 | path->slots[0]); | |
2097 | if (found_key.objectid != key.objectid) | |
2098 | break; | |
7d9eb12c | 2099 | |
ec44a35c | 2100 | /* chunk zero is special */ |
ba1bf481 | 2101 | if (found_key.offset == 0) |
ec44a35c CM |
2102 | break; |
2103 | ||
7d9eb12c | 2104 | btrfs_release_path(chunk_root, path); |
ec44a35c CM |
2105 | ret = btrfs_relocate_chunk(chunk_root, |
2106 | chunk_root->root_key.objectid, | |
2107 | found_key.objectid, | |
2108 | found_key.offset); | |
ba1bf481 JB |
2109 | BUG_ON(ret && ret != -ENOSPC); |
2110 | key.offset = found_key.offset - 1; | |
ec44a35c CM |
2111 | } |
2112 | ret = 0; | |
2113 | error: | |
2114 | btrfs_free_path(path); | |
7d9eb12c | 2115 | mutex_unlock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
2116 | return ret; |
2117 | } | |
2118 | ||
8f18cf13 CM |
2119 | /* |
2120 | * shrinking a device means finding all of the device extents past | |
2121 | * the new size, and then following the back refs to the chunks. | |
2122 | * The chunk relocation code actually frees the device extent | |
2123 | */ | |
2124 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
2125 | { | |
2126 | struct btrfs_trans_handle *trans; | |
2127 | struct btrfs_root *root = device->dev_root; | |
2128 | struct btrfs_dev_extent *dev_extent = NULL; | |
2129 | struct btrfs_path *path; | |
2130 | u64 length; | |
2131 | u64 chunk_tree; | |
2132 | u64 chunk_objectid; | |
2133 | u64 chunk_offset; | |
2134 | int ret; | |
2135 | int slot; | |
ba1bf481 JB |
2136 | int failed = 0; |
2137 | bool retried = false; | |
8f18cf13 CM |
2138 | struct extent_buffer *l; |
2139 | struct btrfs_key key; | |
2140 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
2141 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
ba1bf481 | 2142 | u64 old_size = device->total_bytes; |
8f18cf13 CM |
2143 | u64 diff = device->total_bytes - new_size; |
2144 | ||
2b82032c YZ |
2145 | if (new_size >= device->total_bytes) |
2146 | return -EINVAL; | |
8f18cf13 CM |
2147 | |
2148 | path = btrfs_alloc_path(); | |
2149 | if (!path) | |
2150 | return -ENOMEM; | |
2151 | ||
8f18cf13 CM |
2152 | path->reada = 2; |
2153 | ||
7d9eb12c CM |
2154 | lock_chunks(root); |
2155 | ||
8f18cf13 | 2156 | device->total_bytes = new_size; |
2b82032c YZ |
2157 | if (device->writeable) |
2158 | device->fs_devices->total_rw_bytes -= diff; | |
7d9eb12c | 2159 | unlock_chunks(root); |
8f18cf13 | 2160 | |
ba1bf481 | 2161 | again: |
8f18cf13 CM |
2162 | key.objectid = device->devid; |
2163 | key.offset = (u64)-1; | |
2164 | key.type = BTRFS_DEV_EXTENT_KEY; | |
2165 | ||
2166 | while (1) { | |
2167 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2168 | if (ret < 0) | |
2169 | goto done; | |
2170 | ||
2171 | ret = btrfs_previous_item(root, path, 0, key.type); | |
2172 | if (ret < 0) | |
2173 | goto done; | |
2174 | if (ret) { | |
2175 | ret = 0; | |
ba1bf481 | 2176 | btrfs_release_path(root, path); |
bf1fb512 | 2177 | break; |
8f18cf13 CM |
2178 | } |
2179 | ||
2180 | l = path->nodes[0]; | |
2181 | slot = path->slots[0]; | |
2182 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
2183 | ||
ba1bf481 JB |
2184 | if (key.objectid != device->devid) { |
2185 | btrfs_release_path(root, path); | |
bf1fb512 | 2186 | break; |
ba1bf481 | 2187 | } |
8f18cf13 CM |
2188 | |
2189 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
2190 | length = btrfs_dev_extent_length(l, dev_extent); | |
2191 | ||
ba1bf481 JB |
2192 | if (key.offset + length <= new_size) { |
2193 | btrfs_release_path(root, path); | |
d6397bae | 2194 | break; |
ba1bf481 | 2195 | } |
8f18cf13 CM |
2196 | |
2197 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
2198 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
2199 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
2200 | btrfs_release_path(root, path); | |
2201 | ||
2202 | ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid, | |
2203 | chunk_offset); | |
ba1bf481 | 2204 | if (ret && ret != -ENOSPC) |
8f18cf13 | 2205 | goto done; |
ba1bf481 JB |
2206 | if (ret == -ENOSPC) |
2207 | failed++; | |
2208 | key.offset -= 1; | |
2209 | } | |
2210 | ||
2211 | if (failed && !retried) { | |
2212 | failed = 0; | |
2213 | retried = true; | |
2214 | goto again; | |
2215 | } else if (failed && retried) { | |
2216 | ret = -ENOSPC; | |
2217 | lock_chunks(root); | |
2218 | ||
2219 | device->total_bytes = old_size; | |
2220 | if (device->writeable) | |
2221 | device->fs_devices->total_rw_bytes += diff; | |
2222 | unlock_chunks(root); | |
2223 | goto done; | |
8f18cf13 CM |
2224 | } |
2225 | ||
d6397bae | 2226 | /* Shrinking succeeded, else we would be at "done". */ |
a22285a6 | 2227 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
2228 | if (IS_ERR(trans)) { |
2229 | ret = PTR_ERR(trans); | |
2230 | goto done; | |
2231 | } | |
2232 | ||
d6397bae CB |
2233 | lock_chunks(root); |
2234 | ||
2235 | device->disk_total_bytes = new_size; | |
2236 | /* Now btrfs_update_device() will change the on-disk size. */ | |
2237 | ret = btrfs_update_device(trans, device); | |
2238 | if (ret) { | |
2239 | unlock_chunks(root); | |
2240 | btrfs_end_transaction(trans, root); | |
2241 | goto done; | |
2242 | } | |
2243 | WARN_ON(diff > old_total); | |
2244 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
2245 | unlock_chunks(root); | |
2246 | btrfs_end_transaction(trans, root); | |
8f18cf13 CM |
2247 | done: |
2248 | btrfs_free_path(path); | |
2249 | return ret; | |
2250 | } | |
2251 | ||
b2950863 | 2252 | static int btrfs_add_system_chunk(struct btrfs_trans_handle *trans, |
0b86a832 CM |
2253 | struct btrfs_root *root, |
2254 | struct btrfs_key *key, | |
2255 | struct btrfs_chunk *chunk, int item_size) | |
2256 | { | |
2257 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
2258 | struct btrfs_disk_key disk_key; | |
2259 | u32 array_size; | |
2260 | u8 *ptr; | |
2261 | ||
2262 | array_size = btrfs_super_sys_array_size(super_copy); | |
2263 | if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) | |
2264 | return -EFBIG; | |
2265 | ||
2266 | ptr = super_copy->sys_chunk_array + array_size; | |
2267 | btrfs_cpu_key_to_disk(&disk_key, key); | |
2268 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
2269 | ptr += sizeof(disk_key); | |
2270 | memcpy(ptr, chunk, item_size); | |
2271 | item_size += sizeof(disk_key); | |
2272 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
2273 | return 0; | |
2274 | } | |
2275 | ||
d397712b | 2276 | static noinline u64 chunk_bytes_by_type(u64 type, u64 calc_size, |
a1b32a59 | 2277 | int num_stripes, int sub_stripes) |
9b3f68b9 CM |
2278 | { |
2279 | if (type & (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP)) | |
2280 | return calc_size; | |
2281 | else if (type & BTRFS_BLOCK_GROUP_RAID10) | |
2282 | return calc_size * (num_stripes / sub_stripes); | |
2283 | else | |
2284 | return calc_size * num_stripes; | |
2285 | } | |
2286 | ||
b2117a39 MX |
2287 | /* Used to sort the devices by max_avail(descending sort) */ |
2288 | int btrfs_cmp_device_free_bytes(const void *dev_info1, const void *dev_info2) | |
0b86a832 | 2289 | { |
b2117a39 MX |
2290 | if (((struct btrfs_device_info *)dev_info1)->max_avail > |
2291 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
2292 | return -1; | |
2293 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < | |
2294 | ((struct btrfs_device_info *)dev_info2)->max_avail) | |
2295 | return 1; | |
2296 | else | |
2297 | return 0; | |
2298 | } | |
0b86a832 | 2299 | |
b2117a39 MX |
2300 | static int __btrfs_calc_nstripes(struct btrfs_fs_devices *fs_devices, u64 type, |
2301 | int *num_stripes, int *min_stripes, | |
2302 | int *sub_stripes) | |
2303 | { | |
2304 | *num_stripes = 1; | |
2305 | *min_stripes = 1; | |
2306 | *sub_stripes = 0; | |
593060d7 | 2307 | |
a40a90a0 | 2308 | if (type & (BTRFS_BLOCK_GROUP_RAID0)) { |
b2117a39 MX |
2309 | *num_stripes = fs_devices->rw_devices; |
2310 | *min_stripes = 2; | |
a40a90a0 CM |
2311 | } |
2312 | if (type & (BTRFS_BLOCK_GROUP_DUP)) { | |
b2117a39 MX |
2313 | *num_stripes = 2; |
2314 | *min_stripes = 2; | |
a40a90a0 | 2315 | } |
8790d502 | 2316 | if (type & (BTRFS_BLOCK_GROUP_RAID1)) { |
f3eae7e8 | 2317 | if (fs_devices->rw_devices < 2) |
9b3f68b9 | 2318 | return -ENOSPC; |
b2117a39 MX |
2319 | *num_stripes = 2; |
2320 | *min_stripes = 2; | |
8790d502 | 2321 | } |
321aecc6 | 2322 | if (type & (BTRFS_BLOCK_GROUP_RAID10)) { |
b2117a39 MX |
2323 | *num_stripes = fs_devices->rw_devices; |
2324 | if (*num_stripes < 4) | |
321aecc6 | 2325 | return -ENOSPC; |
b2117a39 MX |
2326 | *num_stripes &= ~(u32)1; |
2327 | *sub_stripes = 2; | |
2328 | *min_stripes = 4; | |
321aecc6 | 2329 | } |
9b3f68b9 | 2330 | |
b2117a39 MX |
2331 | return 0; |
2332 | } | |
2333 | ||
2334 | static u64 __btrfs_calc_stripe_size(struct btrfs_fs_devices *fs_devices, | |
2335 | u64 proposed_size, u64 type, | |
2336 | int num_stripes, int small_stripe) | |
2337 | { | |
2338 | int min_stripe_size = 1 * 1024 * 1024; | |
2339 | u64 calc_size = proposed_size; | |
2340 | u64 max_chunk_size = calc_size; | |
2341 | int ncopies = 1; | |
2342 | ||
2343 | if (type & (BTRFS_BLOCK_GROUP_RAID1 | | |
2344 | BTRFS_BLOCK_GROUP_DUP | | |
2345 | BTRFS_BLOCK_GROUP_RAID10)) | |
2346 | ncopies = 2; | |
2347 | ||
9b3f68b9 CM |
2348 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
2349 | max_chunk_size = 10 * calc_size; | |
a40a90a0 | 2350 | min_stripe_size = 64 * 1024 * 1024; |
9b3f68b9 | 2351 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
83d3c969 | 2352 | max_chunk_size = 256 * 1024 * 1024; |
a40a90a0 CM |
2353 | min_stripe_size = 32 * 1024 * 1024; |
2354 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { | |
2355 | calc_size = 8 * 1024 * 1024; | |
2356 | max_chunk_size = calc_size * 2; | |
2357 | min_stripe_size = 1 * 1024 * 1024; | |
9b3f68b9 CM |
2358 | } |
2359 | ||
2b82032c YZ |
2360 | /* we don't want a chunk larger than 10% of writeable space */ |
2361 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
2362 | max_chunk_size); | |
9b3f68b9 | 2363 | |
1974a3b4 MX |
2364 | if (calc_size * num_stripes > max_chunk_size * ncopies) { |
2365 | calc_size = max_chunk_size * ncopies; | |
9b3f68b9 | 2366 | do_div(calc_size, num_stripes); |
b2117a39 MX |
2367 | do_div(calc_size, BTRFS_STRIPE_LEN); |
2368 | calc_size *= BTRFS_STRIPE_LEN; | |
9b3f68b9 | 2369 | } |
0cad8a11 | 2370 | |
9b3f68b9 | 2371 | /* we don't want tiny stripes */ |
b2117a39 | 2372 | if (!small_stripe) |
0cad8a11 | 2373 | calc_size = max_t(u64, min_stripe_size, calc_size); |
9b3f68b9 | 2374 | |
9f680ce0 | 2375 | /* |
b2117a39 | 2376 | * we're about to do_div by the BTRFS_STRIPE_LEN so lets make sure |
9f680ce0 CM |
2377 | * we end up with something bigger than a stripe |
2378 | */ | |
b2117a39 MX |
2379 | calc_size = max_t(u64, calc_size, BTRFS_STRIPE_LEN); |
2380 | ||
2381 | do_div(calc_size, BTRFS_STRIPE_LEN); | |
2382 | calc_size *= BTRFS_STRIPE_LEN; | |
2383 | ||
2384 | return calc_size; | |
2385 | } | |
2386 | ||
2387 | static struct map_lookup *__shrink_map_lookup_stripes(struct map_lookup *map, | |
2388 | int num_stripes) | |
2389 | { | |
2390 | struct map_lookup *new; | |
2391 | size_t len = map_lookup_size(num_stripes); | |
2392 | ||
2393 | BUG_ON(map->num_stripes < num_stripes); | |
2394 | ||
2395 | if (map->num_stripes == num_stripes) | |
2396 | return map; | |
2397 | ||
2398 | new = kmalloc(len, GFP_NOFS); | |
2399 | if (!new) { | |
2400 | /* just change map->num_stripes */ | |
2401 | map->num_stripes = num_stripes; | |
2402 | return map; | |
2403 | } | |
2404 | ||
2405 | memcpy(new, map, len); | |
2406 | new->num_stripes = num_stripes; | |
2407 | kfree(map); | |
2408 | return new; | |
2409 | } | |
2410 | ||
2411 | /* | |
2412 | * helper to allocate device space from btrfs_device_info, in which we stored | |
2413 | * max free space information of every device. It is used when we can not | |
2414 | * allocate chunks by default size. | |
2415 | * | |
2416 | * By this helper, we can allocate a new chunk as larger as possible. | |
2417 | */ | |
2418 | static int __btrfs_alloc_tiny_space(struct btrfs_trans_handle *trans, | |
2419 | struct btrfs_fs_devices *fs_devices, | |
2420 | struct btrfs_device_info *devices, | |
2421 | int nr_device, u64 type, | |
2422 | struct map_lookup **map_lookup, | |
2423 | int min_stripes, u64 *stripe_size) | |
2424 | { | |
2425 | int i, index, sort_again = 0; | |
2426 | int min_devices = min_stripes; | |
2427 | u64 max_avail, min_free; | |
2428 | struct map_lookup *map = *map_lookup; | |
2429 | int ret; | |
9f680ce0 | 2430 | |
b2117a39 MX |
2431 | if (nr_device < min_stripes) |
2432 | return -ENOSPC; | |
2433 | ||
2434 | btrfs_descending_sort_devices(devices, nr_device); | |
2435 | ||
2436 | max_avail = devices[0].max_avail; | |
2437 | if (!max_avail) | |
2438 | return -ENOSPC; | |
2439 | ||
2440 | for (i = 0; i < nr_device; i++) { | |
2441 | /* | |
2442 | * if dev_offset = 0, it means the free space of this device | |
2443 | * is less than what we need, and we didn't search max avail | |
2444 | * extent on this device, so do it now. | |
2445 | */ | |
2446 | if (!devices[i].dev_offset) { | |
2447 | ret = find_free_dev_extent(trans, devices[i].dev, | |
2448 | max_avail, | |
2449 | &devices[i].dev_offset, | |
2450 | &devices[i].max_avail); | |
2451 | if (ret != 0 && ret != -ENOSPC) | |
2452 | return ret; | |
2453 | sort_again = 1; | |
2454 | } | |
2455 | } | |
2456 | ||
2457 | /* we update the max avail free extent of each devices, sort again */ | |
2458 | if (sort_again) | |
2459 | btrfs_descending_sort_devices(devices, nr_device); | |
2460 | ||
2461 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
2462 | min_devices = 1; | |
2463 | ||
2464 | if (!devices[min_devices - 1].max_avail) | |
2465 | return -ENOSPC; | |
2466 | ||
2467 | max_avail = devices[min_devices - 1].max_avail; | |
2468 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
2469 | do_div(max_avail, 2); | |
2470 | ||
2471 | max_avail = __btrfs_calc_stripe_size(fs_devices, max_avail, type, | |
2472 | min_stripes, 1); | |
2473 | if (type & BTRFS_BLOCK_GROUP_DUP) | |
2474 | min_free = max_avail * 2; | |
2475 | else | |
2476 | min_free = max_avail; | |
2477 | ||
2478 | if (min_free > devices[min_devices - 1].max_avail) | |
2479 | return -ENOSPC; | |
2480 | ||
2481 | map = __shrink_map_lookup_stripes(map, min_stripes); | |
2482 | *stripe_size = max_avail; | |
2483 | ||
2484 | index = 0; | |
2485 | for (i = 0; i < min_stripes; i++) { | |
2486 | map->stripes[i].dev = devices[index].dev; | |
2487 | map->stripes[i].physical = devices[index].dev_offset; | |
2488 | if (type & BTRFS_BLOCK_GROUP_DUP) { | |
2489 | i++; | |
2490 | map->stripes[i].dev = devices[index].dev; | |
2491 | map->stripes[i].physical = devices[index].dev_offset + | |
2492 | max_avail; | |
2493 | } | |
2494 | index++; | |
2495 | } | |
2496 | *map_lookup = map; | |
9f680ce0 | 2497 | |
b2117a39 MX |
2498 | return 0; |
2499 | } | |
2500 | ||
2501 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2502 | struct btrfs_root *extent_root, | |
2503 | struct map_lookup **map_ret, | |
2504 | u64 *num_bytes, u64 *stripe_size, | |
2505 | u64 start, u64 type) | |
2506 | { | |
2507 | struct btrfs_fs_info *info = extent_root->fs_info; | |
2508 | struct btrfs_device *device = NULL; | |
2509 | struct btrfs_fs_devices *fs_devices = info->fs_devices; | |
2510 | struct list_head *cur; | |
2511 | struct map_lookup *map; | |
2512 | struct extent_map_tree *em_tree; | |
2513 | struct extent_map *em; | |
2514 | struct btrfs_device_info *devices_info; | |
2515 | struct list_head private_devs; | |
2516 | u64 calc_size = 1024 * 1024 * 1024; | |
2517 | u64 min_free; | |
2518 | u64 avail; | |
2519 | u64 dev_offset; | |
2520 | int num_stripes; | |
2521 | int min_stripes; | |
2522 | int sub_stripes; | |
2523 | int min_devices; /* the min number of devices we need */ | |
2524 | int i; | |
2525 | int ret; | |
2526 | int index; | |
2527 | ||
2528 | if ((type & BTRFS_BLOCK_GROUP_RAID1) && | |
2529 | (type & BTRFS_BLOCK_GROUP_DUP)) { | |
2530 | WARN_ON(1); | |
2531 | type &= ~BTRFS_BLOCK_GROUP_DUP; | |
2532 | } | |
2533 | if (list_empty(&fs_devices->alloc_list)) | |
2534 | return -ENOSPC; | |
2535 | ||
2536 | ret = __btrfs_calc_nstripes(fs_devices, type, &num_stripes, | |
2537 | &min_stripes, &sub_stripes); | |
2538 | if (ret) | |
2539 | return ret; | |
2540 | ||
2541 | devices_info = kzalloc(sizeof(*devices_info) * fs_devices->rw_devices, | |
2542 | GFP_NOFS); | |
2543 | if (!devices_info) | |
2544 | return -ENOMEM; | |
2545 | ||
2546 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
2547 | if (!map) { | |
2548 | ret = -ENOMEM; | |
2549 | goto error; | |
2550 | } | |
2551 | map->num_stripes = num_stripes; | |
9b3f68b9 | 2552 | |
2b82032c | 2553 | cur = fs_devices->alloc_list.next; |
6324fbf3 | 2554 | index = 0; |
b2117a39 | 2555 | i = 0; |
611f0e00 | 2556 | |
b2117a39 MX |
2557 | calc_size = __btrfs_calc_stripe_size(fs_devices, calc_size, type, |
2558 | num_stripes, 0); | |
2559 | ||
2560 | if (type & BTRFS_BLOCK_GROUP_DUP) { | |
611f0e00 | 2561 | min_free = calc_size * 2; |
b2117a39 MX |
2562 | min_devices = 1; |
2563 | } else { | |
9b3f68b9 | 2564 | min_free = calc_size; |
b2117a39 MX |
2565 | min_devices = min_stripes; |
2566 | } | |
ad5bd91e | 2567 | |
2b82032c | 2568 | INIT_LIST_HEAD(&private_devs); |
d397712b | 2569 | while (index < num_stripes) { |
b3075717 | 2570 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
2b82032c | 2571 | BUG_ON(!device->writeable); |
dfe25020 CM |
2572 | if (device->total_bytes > device->bytes_used) |
2573 | avail = device->total_bytes - device->bytes_used; | |
2574 | else | |
2575 | avail = 0; | |
6324fbf3 | 2576 | cur = cur->next; |
8f18cf13 | 2577 | |
dfe25020 | 2578 | if (device->in_fs_metadata && avail >= min_free) { |
b2117a39 MX |
2579 | ret = find_free_dev_extent(trans, device, min_free, |
2580 | &devices_info[i].dev_offset, | |
2581 | &devices_info[i].max_avail); | |
8f18cf13 CM |
2582 | if (ret == 0) { |
2583 | list_move_tail(&device->dev_alloc_list, | |
2584 | &private_devs); | |
2b82032c | 2585 | map->stripes[index].dev = device; |
b2117a39 MX |
2586 | map->stripes[index].physical = |
2587 | devices_info[i].dev_offset; | |
611f0e00 | 2588 | index++; |
2b82032c YZ |
2589 | if (type & BTRFS_BLOCK_GROUP_DUP) { |
2590 | map->stripes[index].dev = device; | |
2591 | map->stripes[index].physical = | |
b2117a39 MX |
2592 | devices_info[i].dev_offset + |
2593 | calc_size; | |
8f18cf13 | 2594 | index++; |
2b82032c | 2595 | } |
b2117a39 MX |
2596 | } else if (ret != -ENOSPC) |
2597 | goto error; | |
2598 | ||
2599 | devices_info[i].dev = device; | |
2600 | i++; | |
2601 | } else if (device->in_fs_metadata && | |
2602 | avail >= BTRFS_STRIPE_LEN) { | |
2603 | devices_info[i].dev = device; | |
2604 | devices_info[i].max_avail = avail; | |
2605 | i++; | |
2606 | } | |
2607 | ||
2b82032c | 2608 | if (cur == &fs_devices->alloc_list) |
6324fbf3 CM |
2609 | break; |
2610 | } | |
b2117a39 | 2611 | |
2b82032c | 2612 | list_splice(&private_devs, &fs_devices->alloc_list); |
6324fbf3 | 2613 | if (index < num_stripes) { |
a40a90a0 CM |
2614 | if (index >= min_stripes) { |
2615 | num_stripes = index; | |
2616 | if (type & (BTRFS_BLOCK_GROUP_RAID10)) { | |
2617 | num_stripes /= sub_stripes; | |
2618 | num_stripes *= sub_stripes; | |
2619 | } | |
b2117a39 MX |
2620 | |
2621 | map = __shrink_map_lookup_stripes(map, num_stripes); | |
2622 | } else if (i >= min_devices) { | |
2623 | ret = __btrfs_alloc_tiny_space(trans, fs_devices, | |
2624 | devices_info, i, type, | |
2625 | &map, min_stripes, | |
2626 | &calc_size); | |
2627 | if (ret) | |
2628 | goto error; | |
2629 | } else { | |
2630 | ret = -ENOSPC; | |
2631 | goto error; | |
6324fbf3 | 2632 | } |
6324fbf3 | 2633 | } |
2b82032c | 2634 | map->sector_size = extent_root->sectorsize; |
b2117a39 MX |
2635 | map->stripe_len = BTRFS_STRIPE_LEN; |
2636 | map->io_align = BTRFS_STRIPE_LEN; | |
2637 | map->io_width = BTRFS_STRIPE_LEN; | |
2b82032c | 2638 | map->type = type; |
2b82032c | 2639 | map->sub_stripes = sub_stripes; |
0b86a832 | 2640 | |
2b82032c YZ |
2641 | *map_ret = map; |
2642 | *stripe_size = calc_size; | |
2643 | *num_bytes = chunk_bytes_by_type(type, calc_size, | |
b2117a39 | 2644 | map->num_stripes, sub_stripes); |
0b86a832 | 2645 | |
2b82032c YZ |
2646 | em = alloc_extent_map(GFP_NOFS); |
2647 | if (!em) { | |
b2117a39 MX |
2648 | ret = -ENOMEM; |
2649 | goto error; | |
593060d7 | 2650 | } |
2b82032c YZ |
2651 | em->bdev = (struct block_device *)map; |
2652 | em->start = start; | |
2653 | em->len = *num_bytes; | |
2654 | em->block_start = 0; | |
2655 | em->block_len = em->len; | |
593060d7 | 2656 | |
2b82032c | 2657 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
890871be | 2658 | write_lock(&em_tree->lock); |
2b82032c | 2659 | ret = add_extent_mapping(em_tree, em); |
890871be | 2660 | write_unlock(&em_tree->lock); |
2b82032c YZ |
2661 | BUG_ON(ret); |
2662 | free_extent_map(em); | |
0b86a832 | 2663 | |
2b82032c YZ |
2664 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
2665 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
2666 | start, *num_bytes); | |
2667 | BUG_ON(ret); | |
611f0e00 | 2668 | |
2b82032c YZ |
2669 | index = 0; |
2670 | while (index < map->num_stripes) { | |
2671 | device = map->stripes[index].dev; | |
2672 | dev_offset = map->stripes[index].physical; | |
0b86a832 CM |
2673 | |
2674 | ret = btrfs_alloc_dev_extent(trans, device, | |
2b82032c YZ |
2675 | info->chunk_root->root_key.objectid, |
2676 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
2677 | start, dev_offset, calc_size); | |
0b86a832 | 2678 | BUG_ON(ret); |
2b82032c YZ |
2679 | index++; |
2680 | } | |
2681 | ||
b2117a39 | 2682 | kfree(devices_info); |
2b82032c | 2683 | return 0; |
b2117a39 MX |
2684 | |
2685 | error: | |
2686 | kfree(map); | |
2687 | kfree(devices_info); | |
2688 | return ret; | |
2b82032c YZ |
2689 | } |
2690 | ||
2691 | static int __finish_chunk_alloc(struct btrfs_trans_handle *trans, | |
2692 | struct btrfs_root *extent_root, | |
2693 | struct map_lookup *map, u64 chunk_offset, | |
2694 | u64 chunk_size, u64 stripe_size) | |
2695 | { | |
2696 | u64 dev_offset; | |
2697 | struct btrfs_key key; | |
2698 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2699 | struct btrfs_device *device; | |
2700 | struct btrfs_chunk *chunk; | |
2701 | struct btrfs_stripe *stripe; | |
2702 | size_t item_size = btrfs_chunk_item_size(map->num_stripes); | |
2703 | int index = 0; | |
2704 | int ret; | |
2705 | ||
2706 | chunk = kzalloc(item_size, GFP_NOFS); | |
2707 | if (!chunk) | |
2708 | return -ENOMEM; | |
2709 | ||
2710 | index = 0; | |
2711 | while (index < map->num_stripes) { | |
2712 | device = map->stripes[index].dev; | |
2713 | device->bytes_used += stripe_size; | |
0b86a832 CM |
2714 | ret = btrfs_update_device(trans, device); |
2715 | BUG_ON(ret); | |
2b82032c YZ |
2716 | index++; |
2717 | } | |
2718 | ||
2719 | index = 0; | |
2720 | stripe = &chunk->stripe; | |
2721 | while (index < map->num_stripes) { | |
2722 | device = map->stripes[index].dev; | |
2723 | dev_offset = map->stripes[index].physical; | |
0b86a832 | 2724 | |
e17cade2 CM |
2725 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
2726 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
2727 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 2728 | stripe++; |
0b86a832 CM |
2729 | index++; |
2730 | } | |
2731 | ||
2b82032c | 2732 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 2733 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
2734 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
2735 | btrfs_set_stack_chunk_type(chunk, map->type); | |
2736 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
2737 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
2738 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b86a832 | 2739 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
2b82032c | 2740 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 2741 | |
2b82032c YZ |
2742 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2743 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2744 | key.offset = chunk_offset; | |
0b86a832 | 2745 | |
2b82032c YZ |
2746 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
2747 | BUG_ON(ret); | |
0b86a832 | 2748 | |
2b82032c YZ |
2749 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2750 | ret = btrfs_add_system_chunk(trans, chunk_root, &key, chunk, | |
2751 | item_size); | |
8f18cf13 CM |
2752 | BUG_ON(ret); |
2753 | } | |
0b86a832 | 2754 | kfree(chunk); |
2b82032c YZ |
2755 | return 0; |
2756 | } | |
0b86a832 | 2757 | |
2b82032c YZ |
2758 | /* |
2759 | * Chunk allocation falls into two parts. The first part does works | |
2760 | * that make the new allocated chunk useable, but not do any operation | |
2761 | * that modifies the chunk tree. The second part does the works that | |
2762 | * require modifying the chunk tree. This division is important for the | |
2763 | * bootstrap process of adding storage to a seed btrfs. | |
2764 | */ | |
2765 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2766 | struct btrfs_root *extent_root, u64 type) | |
2767 | { | |
2768 | u64 chunk_offset; | |
2769 | u64 chunk_size; | |
2770 | u64 stripe_size; | |
2771 | struct map_lookup *map; | |
2772 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2773 | int ret; | |
2774 | ||
2775 | ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
2776 | &chunk_offset); | |
2777 | if (ret) | |
2778 | return ret; | |
2779 | ||
2780 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2781 | &stripe_size, chunk_offset, type); | |
2782 | if (ret) | |
2783 | return ret; | |
2784 | ||
2785 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2786 | chunk_size, stripe_size); | |
2787 | BUG_ON(ret); | |
2788 | return 0; | |
2789 | } | |
2790 | ||
d397712b | 2791 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
2b82032c YZ |
2792 | struct btrfs_root *root, |
2793 | struct btrfs_device *device) | |
2794 | { | |
2795 | u64 chunk_offset; | |
2796 | u64 sys_chunk_offset; | |
2797 | u64 chunk_size; | |
2798 | u64 sys_chunk_size; | |
2799 | u64 stripe_size; | |
2800 | u64 sys_stripe_size; | |
2801 | u64 alloc_profile; | |
2802 | struct map_lookup *map; | |
2803 | struct map_lookup *sys_map; | |
2804 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2805 | struct btrfs_root *extent_root = fs_info->extent_root; | |
2806 | int ret; | |
2807 | ||
2808 | ret = find_next_chunk(fs_info->chunk_root, | |
2809 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset); | |
2810 | BUG_ON(ret); | |
2811 | ||
2812 | alloc_profile = BTRFS_BLOCK_GROUP_METADATA | | |
2813 | (fs_info->metadata_alloc_profile & | |
2814 | fs_info->avail_metadata_alloc_bits); | |
2815 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2816 | ||
2817 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2818 | &stripe_size, chunk_offset, alloc_profile); | |
2819 | BUG_ON(ret); | |
2820 | ||
2821 | sys_chunk_offset = chunk_offset + chunk_size; | |
2822 | ||
2823 | alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM | | |
2824 | (fs_info->system_alloc_profile & | |
2825 | fs_info->avail_system_alloc_bits); | |
2826 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2827 | ||
2828 | ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map, | |
2829 | &sys_chunk_size, &sys_stripe_size, | |
2830 | sys_chunk_offset, alloc_profile); | |
2831 | BUG_ON(ret); | |
2832 | ||
2833 | ret = btrfs_add_device(trans, fs_info->chunk_root, device); | |
2834 | BUG_ON(ret); | |
2835 | ||
2836 | /* | |
2837 | * Modifying chunk tree needs allocating new blocks from both | |
2838 | * system block group and metadata block group. So we only can | |
2839 | * do operations require modifying the chunk tree after both | |
2840 | * block groups were created. | |
2841 | */ | |
2842 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2843 | chunk_size, stripe_size); | |
2844 | BUG_ON(ret); | |
2845 | ||
2846 | ret = __finish_chunk_alloc(trans, extent_root, sys_map, | |
2847 | sys_chunk_offset, sys_chunk_size, | |
2848 | sys_stripe_size); | |
b248a415 | 2849 | BUG_ON(ret); |
2b82032c YZ |
2850 | return 0; |
2851 | } | |
2852 | ||
2853 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) | |
2854 | { | |
2855 | struct extent_map *em; | |
2856 | struct map_lookup *map; | |
2857 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
2858 | int readonly = 0; | |
2859 | int i; | |
2860 | ||
890871be | 2861 | read_lock(&map_tree->map_tree.lock); |
2b82032c | 2862 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
890871be | 2863 | read_unlock(&map_tree->map_tree.lock); |
2b82032c YZ |
2864 | if (!em) |
2865 | return 1; | |
2866 | ||
f48b9075 JB |
2867 | if (btrfs_test_opt(root, DEGRADED)) { |
2868 | free_extent_map(em); | |
2869 | return 0; | |
2870 | } | |
2871 | ||
2b82032c YZ |
2872 | map = (struct map_lookup *)em->bdev; |
2873 | for (i = 0; i < map->num_stripes; i++) { | |
2874 | if (!map->stripes[i].dev->writeable) { | |
2875 | readonly = 1; | |
2876 | break; | |
2877 | } | |
2878 | } | |
0b86a832 | 2879 | free_extent_map(em); |
2b82032c | 2880 | return readonly; |
0b86a832 CM |
2881 | } |
2882 | ||
2883 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
2884 | { | |
2885 | extent_map_tree_init(&tree->map_tree, GFP_NOFS); | |
2886 | } | |
2887 | ||
2888 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
2889 | { | |
2890 | struct extent_map *em; | |
2891 | ||
d397712b | 2892 | while (1) { |
890871be | 2893 | write_lock(&tree->map_tree.lock); |
0b86a832 CM |
2894 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
2895 | if (em) | |
2896 | remove_extent_mapping(&tree->map_tree, em); | |
890871be | 2897 | write_unlock(&tree->map_tree.lock); |
0b86a832 CM |
2898 | if (!em) |
2899 | break; | |
2900 | kfree(em->bdev); | |
2901 | /* once for us */ | |
2902 | free_extent_map(em); | |
2903 | /* once for the tree */ | |
2904 | free_extent_map(em); | |
2905 | } | |
2906 | } | |
2907 | ||
f188591e CM |
2908 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len) |
2909 | { | |
2910 | struct extent_map *em; | |
2911 | struct map_lookup *map; | |
2912 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2913 | int ret; | |
2914 | ||
890871be | 2915 | read_lock(&em_tree->lock); |
f188591e | 2916 | em = lookup_extent_mapping(em_tree, logical, len); |
890871be | 2917 | read_unlock(&em_tree->lock); |
f188591e CM |
2918 | BUG_ON(!em); |
2919 | ||
2920 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2921 | map = (struct map_lookup *)em->bdev; | |
2922 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
2923 | ret = map->num_stripes; | |
321aecc6 CM |
2924 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
2925 | ret = map->sub_stripes; | |
f188591e CM |
2926 | else |
2927 | ret = 1; | |
2928 | free_extent_map(em); | |
f188591e CM |
2929 | return ret; |
2930 | } | |
2931 | ||
dfe25020 CM |
2932 | static int find_live_mirror(struct map_lookup *map, int first, int num, |
2933 | int optimal) | |
2934 | { | |
2935 | int i; | |
2936 | if (map->stripes[optimal].dev->bdev) | |
2937 | return optimal; | |
2938 | for (i = first; i < first + num; i++) { | |
2939 | if (map->stripes[i].dev->bdev) | |
2940 | return i; | |
2941 | } | |
2942 | /* we couldn't find one that doesn't fail. Just return something | |
2943 | * and the io error handling code will clean up eventually | |
2944 | */ | |
2945 | return optimal; | |
2946 | } | |
2947 | ||
f2d8d74d CM |
2948 | static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
2949 | u64 logical, u64 *length, | |
2950 | struct btrfs_multi_bio **multi_ret, | |
2951 | int mirror_num, struct page *unplug_page) | |
0b86a832 CM |
2952 | { |
2953 | struct extent_map *em; | |
2954 | struct map_lookup *map; | |
2955 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2956 | u64 offset; | |
593060d7 CM |
2957 | u64 stripe_offset; |
2958 | u64 stripe_nr; | |
cea9e445 | 2959 | int stripes_allocated = 8; |
321aecc6 | 2960 | int stripes_required = 1; |
593060d7 | 2961 | int stripe_index; |
cea9e445 | 2962 | int i; |
f2d8d74d | 2963 | int num_stripes; |
a236aed1 | 2964 | int max_errors = 0; |
cea9e445 | 2965 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 2966 | |
7b6d91da | 2967 | if (multi_ret && !(rw & REQ_WRITE)) |
cea9e445 | 2968 | stripes_allocated = 1; |
cea9e445 CM |
2969 | again: |
2970 | if (multi_ret) { | |
2971 | multi = kzalloc(btrfs_multi_bio_size(stripes_allocated), | |
2972 | GFP_NOFS); | |
2973 | if (!multi) | |
2974 | return -ENOMEM; | |
a236aed1 CM |
2975 | |
2976 | atomic_set(&multi->error, 0); | |
cea9e445 | 2977 | } |
0b86a832 | 2978 | |
890871be | 2979 | read_lock(&em_tree->lock); |
0b86a832 | 2980 | em = lookup_extent_mapping(em_tree, logical, *length); |
890871be | 2981 | read_unlock(&em_tree->lock); |
f2d8d74d | 2982 | |
2423fdfb JS |
2983 | if (!em && unplug_page) { |
2984 | kfree(multi); | |
f2d8d74d | 2985 | return 0; |
2423fdfb | 2986 | } |
f2d8d74d | 2987 | |
3b951516 | 2988 | if (!em) { |
d397712b CM |
2989 | printk(KERN_CRIT "unable to find logical %llu len %llu\n", |
2990 | (unsigned long long)logical, | |
2991 | (unsigned long long)*length); | |
f2d8d74d | 2992 | BUG(); |
3b951516 | 2993 | } |
0b86a832 CM |
2994 | |
2995 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2996 | map = (struct map_lookup *)em->bdev; | |
2997 | offset = logical - em->start; | |
593060d7 | 2998 | |
f188591e CM |
2999 | if (mirror_num > map->num_stripes) |
3000 | mirror_num = 0; | |
3001 | ||
cea9e445 | 3002 | /* if our multi bio struct is too small, back off and try again */ |
7b6d91da | 3003 | if (rw & REQ_WRITE) { |
321aecc6 CM |
3004 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | |
3005 | BTRFS_BLOCK_GROUP_DUP)) { | |
3006 | stripes_required = map->num_stripes; | |
a236aed1 | 3007 | max_errors = 1; |
321aecc6 CM |
3008 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3009 | stripes_required = map->sub_stripes; | |
a236aed1 | 3010 | max_errors = 1; |
321aecc6 CM |
3011 | } |
3012 | } | |
7b6d91da | 3013 | if (multi_ret && (rw & REQ_WRITE) && |
321aecc6 | 3014 | stripes_allocated < stripes_required) { |
cea9e445 | 3015 | stripes_allocated = map->num_stripes; |
cea9e445 CM |
3016 | free_extent_map(em); |
3017 | kfree(multi); | |
3018 | goto again; | |
3019 | } | |
593060d7 CM |
3020 | stripe_nr = offset; |
3021 | /* | |
3022 | * stripe_nr counts the total number of stripes we have to stride | |
3023 | * to get to this block | |
3024 | */ | |
3025 | do_div(stripe_nr, map->stripe_len); | |
3026 | ||
3027 | stripe_offset = stripe_nr * map->stripe_len; | |
3028 | BUG_ON(offset < stripe_offset); | |
3029 | ||
3030 | /* stripe_offset is the offset of this block in its stripe*/ | |
3031 | stripe_offset = offset - stripe_offset; | |
3032 | ||
cea9e445 | 3033 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 | |
321aecc6 | 3034 | BTRFS_BLOCK_GROUP_RAID10 | |
cea9e445 CM |
3035 | BTRFS_BLOCK_GROUP_DUP)) { |
3036 | /* we limit the length of each bio to what fits in a stripe */ | |
3037 | *length = min_t(u64, em->len - offset, | |
3038 | map->stripe_len - stripe_offset); | |
3039 | } else { | |
3040 | *length = em->len - offset; | |
3041 | } | |
f2d8d74d CM |
3042 | |
3043 | if (!multi_ret && !unplug_page) | |
cea9e445 CM |
3044 | goto out; |
3045 | ||
f2d8d74d | 3046 | num_stripes = 1; |
cea9e445 | 3047 | stripe_index = 0; |
8790d502 | 3048 | if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
7b6d91da | 3049 | if (unplug_page || (rw & REQ_WRITE)) |
f2d8d74d | 3050 | num_stripes = map->num_stripes; |
2fff734f | 3051 | else if (mirror_num) |
f188591e | 3052 | stripe_index = mirror_num - 1; |
dfe25020 CM |
3053 | else { |
3054 | stripe_index = find_live_mirror(map, 0, | |
3055 | map->num_stripes, | |
3056 | current->pid % map->num_stripes); | |
3057 | } | |
2fff734f | 3058 | |
611f0e00 | 3059 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
7b6d91da | 3060 | if (rw & REQ_WRITE) |
f2d8d74d | 3061 | num_stripes = map->num_stripes; |
f188591e CM |
3062 | else if (mirror_num) |
3063 | stripe_index = mirror_num - 1; | |
2fff734f | 3064 | |
321aecc6 CM |
3065 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3066 | int factor = map->num_stripes / map->sub_stripes; | |
321aecc6 CM |
3067 | |
3068 | stripe_index = do_div(stripe_nr, factor); | |
3069 | stripe_index *= map->sub_stripes; | |
3070 | ||
7b6d91da | 3071 | if (unplug_page || (rw & REQ_WRITE)) |
f2d8d74d | 3072 | num_stripes = map->sub_stripes; |
321aecc6 CM |
3073 | else if (mirror_num) |
3074 | stripe_index += mirror_num - 1; | |
dfe25020 CM |
3075 | else { |
3076 | stripe_index = find_live_mirror(map, stripe_index, | |
3077 | map->sub_stripes, stripe_index + | |
3078 | current->pid % map->sub_stripes); | |
3079 | } | |
8790d502 CM |
3080 | } else { |
3081 | /* | |
3082 | * after this do_div call, stripe_nr is the number of stripes | |
3083 | * on this device we have to walk to find the data, and | |
3084 | * stripe_index is the number of our device in the stripe array | |
3085 | */ | |
3086 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
3087 | } | |
593060d7 | 3088 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 3089 | |
f2d8d74d CM |
3090 | for (i = 0; i < num_stripes; i++) { |
3091 | if (unplug_page) { | |
3092 | struct btrfs_device *device; | |
3093 | struct backing_dev_info *bdi; | |
3094 | ||
3095 | device = map->stripes[stripe_index].dev; | |
dfe25020 CM |
3096 | if (device->bdev) { |
3097 | bdi = blk_get_backing_dev_info(device->bdev); | |
d397712b | 3098 | if (bdi->unplug_io_fn) |
dfe25020 | 3099 | bdi->unplug_io_fn(bdi, unplug_page); |
f2d8d74d CM |
3100 | } |
3101 | } else { | |
3102 | multi->stripes[i].physical = | |
3103 | map->stripes[stripe_index].physical + | |
3104 | stripe_offset + stripe_nr * map->stripe_len; | |
3105 | multi->stripes[i].dev = map->stripes[stripe_index].dev; | |
3106 | } | |
cea9e445 | 3107 | stripe_index++; |
593060d7 | 3108 | } |
f2d8d74d CM |
3109 | if (multi_ret) { |
3110 | *multi_ret = multi; | |
3111 | multi->num_stripes = num_stripes; | |
a236aed1 | 3112 | multi->max_errors = max_errors; |
f2d8d74d | 3113 | } |
cea9e445 | 3114 | out: |
0b86a832 | 3115 | free_extent_map(em); |
0b86a832 CM |
3116 | return 0; |
3117 | } | |
3118 | ||
f2d8d74d CM |
3119 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
3120 | u64 logical, u64 *length, | |
3121 | struct btrfs_multi_bio **multi_ret, int mirror_num) | |
3122 | { | |
3123 | return __btrfs_map_block(map_tree, rw, logical, length, multi_ret, | |
3124 | mirror_num, NULL); | |
3125 | } | |
3126 | ||
a512bbf8 YZ |
3127 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
3128 | u64 chunk_start, u64 physical, u64 devid, | |
3129 | u64 **logical, int *naddrs, int *stripe_len) | |
3130 | { | |
3131 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
3132 | struct extent_map *em; | |
3133 | struct map_lookup *map; | |
3134 | u64 *buf; | |
3135 | u64 bytenr; | |
3136 | u64 length; | |
3137 | u64 stripe_nr; | |
3138 | int i, j, nr = 0; | |
3139 | ||
890871be | 3140 | read_lock(&em_tree->lock); |
a512bbf8 | 3141 | em = lookup_extent_mapping(em_tree, chunk_start, 1); |
890871be | 3142 | read_unlock(&em_tree->lock); |
a512bbf8 YZ |
3143 | |
3144 | BUG_ON(!em || em->start != chunk_start); | |
3145 | map = (struct map_lookup *)em->bdev; | |
3146 | ||
3147 | length = em->len; | |
3148 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) | |
3149 | do_div(length, map->num_stripes / map->sub_stripes); | |
3150 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
3151 | do_div(length, map->num_stripes); | |
3152 | ||
3153 | buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); | |
3154 | BUG_ON(!buf); | |
3155 | ||
3156 | for (i = 0; i < map->num_stripes; i++) { | |
3157 | if (devid && map->stripes[i].dev->devid != devid) | |
3158 | continue; | |
3159 | if (map->stripes[i].physical > physical || | |
3160 | map->stripes[i].physical + length <= physical) | |
3161 | continue; | |
3162 | ||
3163 | stripe_nr = physical - map->stripes[i].physical; | |
3164 | do_div(stripe_nr, map->stripe_len); | |
3165 | ||
3166 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
3167 | stripe_nr = stripe_nr * map->num_stripes + i; | |
3168 | do_div(stripe_nr, map->sub_stripes); | |
3169 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3170 | stripe_nr = stripe_nr * map->num_stripes + i; | |
3171 | } | |
3172 | bytenr = chunk_start + stripe_nr * map->stripe_len; | |
934d375b | 3173 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
3174 | for (j = 0; j < nr; j++) { |
3175 | if (buf[j] == bytenr) | |
3176 | break; | |
3177 | } | |
934d375b CM |
3178 | if (j == nr) { |
3179 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 3180 | buf[nr++] = bytenr; |
934d375b | 3181 | } |
a512bbf8 YZ |
3182 | } |
3183 | ||
a512bbf8 YZ |
3184 | *logical = buf; |
3185 | *naddrs = nr; | |
3186 | *stripe_len = map->stripe_len; | |
3187 | ||
3188 | free_extent_map(em); | |
3189 | return 0; | |
3190 | } | |
3191 | ||
f2d8d74d CM |
3192 | int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, |
3193 | u64 logical, struct page *page) | |
3194 | { | |
3195 | u64 length = PAGE_CACHE_SIZE; | |
3196 | return __btrfs_map_block(map_tree, READ, logical, &length, | |
3197 | NULL, 0, page); | |
3198 | } | |
3199 | ||
8790d502 | 3200 | static void end_bio_multi_stripe(struct bio *bio, int err) |
8790d502 | 3201 | { |
cea9e445 | 3202 | struct btrfs_multi_bio *multi = bio->bi_private; |
7d2b4daa | 3203 | int is_orig_bio = 0; |
8790d502 | 3204 | |
8790d502 | 3205 | if (err) |
a236aed1 | 3206 | atomic_inc(&multi->error); |
8790d502 | 3207 | |
7d2b4daa CM |
3208 | if (bio == multi->orig_bio) |
3209 | is_orig_bio = 1; | |
3210 | ||
cea9e445 | 3211 | if (atomic_dec_and_test(&multi->stripes_pending)) { |
7d2b4daa CM |
3212 | if (!is_orig_bio) { |
3213 | bio_put(bio); | |
3214 | bio = multi->orig_bio; | |
3215 | } | |
8790d502 CM |
3216 | bio->bi_private = multi->private; |
3217 | bio->bi_end_io = multi->end_io; | |
a236aed1 CM |
3218 | /* only send an error to the higher layers if it is |
3219 | * beyond the tolerance of the multi-bio | |
3220 | */ | |
1259ab75 | 3221 | if (atomic_read(&multi->error) > multi->max_errors) { |
a236aed1 | 3222 | err = -EIO; |
1259ab75 CM |
3223 | } else if (err) { |
3224 | /* | |
3225 | * this bio is actually up to date, we didn't | |
3226 | * go over the max number of errors | |
3227 | */ | |
3228 | set_bit(BIO_UPTODATE, &bio->bi_flags); | |
a236aed1 | 3229 | err = 0; |
1259ab75 | 3230 | } |
8790d502 CM |
3231 | kfree(multi); |
3232 | ||
3233 | bio_endio(bio, err); | |
7d2b4daa | 3234 | } else if (!is_orig_bio) { |
8790d502 CM |
3235 | bio_put(bio); |
3236 | } | |
8790d502 CM |
3237 | } |
3238 | ||
8b712842 CM |
3239 | struct async_sched { |
3240 | struct bio *bio; | |
3241 | int rw; | |
3242 | struct btrfs_fs_info *info; | |
3243 | struct btrfs_work work; | |
3244 | }; | |
3245 | ||
3246 | /* | |
3247 | * see run_scheduled_bios for a description of why bios are collected for | |
3248 | * async submit. | |
3249 | * | |
3250 | * This will add one bio to the pending list for a device and make sure | |
3251 | * the work struct is scheduled. | |
3252 | */ | |
d397712b | 3253 | static noinline int schedule_bio(struct btrfs_root *root, |
a1b32a59 CM |
3254 | struct btrfs_device *device, |
3255 | int rw, struct bio *bio) | |
8b712842 CM |
3256 | { |
3257 | int should_queue = 1; | |
ffbd517d | 3258 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
3259 | |
3260 | /* don't bother with additional async steps for reads, right now */ | |
7b6d91da | 3261 | if (!(rw & REQ_WRITE)) { |
492bb6de | 3262 | bio_get(bio); |
8b712842 | 3263 | submit_bio(rw, bio); |
492bb6de | 3264 | bio_put(bio); |
8b712842 CM |
3265 | return 0; |
3266 | } | |
3267 | ||
3268 | /* | |
0986fe9e | 3269 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
3270 | * higher layers. Otherwise, the async bio makes it appear we have |
3271 | * made progress against dirty pages when we've really just put it | |
3272 | * on a queue for later | |
3273 | */ | |
0986fe9e | 3274 | atomic_inc(&root->fs_info->nr_async_bios); |
492bb6de | 3275 | WARN_ON(bio->bi_next); |
8b712842 CM |
3276 | bio->bi_next = NULL; |
3277 | bio->bi_rw |= rw; | |
3278 | ||
3279 | spin_lock(&device->io_lock); | |
7b6d91da | 3280 | if (bio->bi_rw & REQ_SYNC) |
ffbd517d CM |
3281 | pending_bios = &device->pending_sync_bios; |
3282 | else | |
3283 | pending_bios = &device->pending_bios; | |
8b712842 | 3284 | |
ffbd517d CM |
3285 | if (pending_bios->tail) |
3286 | pending_bios->tail->bi_next = bio; | |
8b712842 | 3287 | |
ffbd517d CM |
3288 | pending_bios->tail = bio; |
3289 | if (!pending_bios->head) | |
3290 | pending_bios->head = bio; | |
8b712842 CM |
3291 | if (device->running_pending) |
3292 | should_queue = 0; | |
3293 | ||
3294 | spin_unlock(&device->io_lock); | |
3295 | ||
3296 | if (should_queue) | |
1cc127b5 CM |
3297 | btrfs_queue_worker(&root->fs_info->submit_workers, |
3298 | &device->work); | |
8b712842 CM |
3299 | return 0; |
3300 | } | |
3301 | ||
f188591e | 3302 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 3303 | int mirror_num, int async_submit) |
0b86a832 CM |
3304 | { |
3305 | struct btrfs_mapping_tree *map_tree; | |
3306 | struct btrfs_device *dev; | |
8790d502 | 3307 | struct bio *first_bio = bio; |
a62b9401 | 3308 | u64 logical = (u64)bio->bi_sector << 9; |
0b86a832 CM |
3309 | u64 length = 0; |
3310 | u64 map_length; | |
cea9e445 | 3311 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 3312 | int ret; |
8790d502 CM |
3313 | int dev_nr = 0; |
3314 | int total_devs = 1; | |
0b86a832 | 3315 | |
f2d8d74d | 3316 | length = bio->bi_size; |
0b86a832 CM |
3317 | map_tree = &root->fs_info->mapping_tree; |
3318 | map_length = length; | |
cea9e445 | 3319 | |
f188591e CM |
3320 | ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi, |
3321 | mirror_num); | |
cea9e445 CM |
3322 | BUG_ON(ret); |
3323 | ||
3324 | total_devs = multi->num_stripes; | |
3325 | if (map_length < length) { | |
d397712b CM |
3326 | printk(KERN_CRIT "mapping failed logical %llu bio len %llu " |
3327 | "len %llu\n", (unsigned long long)logical, | |
3328 | (unsigned long long)length, | |
3329 | (unsigned long long)map_length); | |
cea9e445 CM |
3330 | BUG(); |
3331 | } | |
3332 | multi->end_io = first_bio->bi_end_io; | |
3333 | multi->private = first_bio->bi_private; | |
7d2b4daa | 3334 | multi->orig_bio = first_bio; |
cea9e445 CM |
3335 | atomic_set(&multi->stripes_pending, multi->num_stripes); |
3336 | ||
d397712b | 3337 | while (dev_nr < total_devs) { |
8790d502 | 3338 | if (total_devs > 1) { |
8790d502 CM |
3339 | if (dev_nr < total_devs - 1) { |
3340 | bio = bio_clone(first_bio, GFP_NOFS); | |
3341 | BUG_ON(!bio); | |
3342 | } else { | |
3343 | bio = first_bio; | |
3344 | } | |
3345 | bio->bi_private = multi; | |
3346 | bio->bi_end_io = end_bio_multi_stripe; | |
3347 | } | |
cea9e445 CM |
3348 | bio->bi_sector = multi->stripes[dev_nr].physical >> 9; |
3349 | dev = multi->stripes[dev_nr].dev; | |
18e503d6 | 3350 | if (dev && dev->bdev && (rw != WRITE || dev->writeable)) { |
dfe25020 | 3351 | bio->bi_bdev = dev->bdev; |
8b712842 CM |
3352 | if (async_submit) |
3353 | schedule_bio(root, dev, rw, bio); | |
3354 | else | |
3355 | submit_bio(rw, bio); | |
dfe25020 CM |
3356 | } else { |
3357 | bio->bi_bdev = root->fs_info->fs_devices->latest_bdev; | |
3358 | bio->bi_sector = logical >> 9; | |
dfe25020 | 3359 | bio_endio(bio, -EIO); |
dfe25020 | 3360 | } |
8790d502 CM |
3361 | dev_nr++; |
3362 | } | |
cea9e445 CM |
3363 | if (total_devs == 1) |
3364 | kfree(multi); | |
0b86a832 CM |
3365 | return 0; |
3366 | } | |
3367 | ||
a443755f | 3368 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, |
2b82032c | 3369 | u8 *uuid, u8 *fsid) |
0b86a832 | 3370 | { |
2b82032c YZ |
3371 | struct btrfs_device *device; |
3372 | struct btrfs_fs_devices *cur_devices; | |
3373 | ||
3374 | cur_devices = root->fs_info->fs_devices; | |
3375 | while (cur_devices) { | |
3376 | if (!fsid || | |
3377 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
3378 | device = __find_device(&cur_devices->devices, | |
3379 | devid, uuid); | |
3380 | if (device) | |
3381 | return device; | |
3382 | } | |
3383 | cur_devices = cur_devices->seed; | |
3384 | } | |
3385 | return NULL; | |
0b86a832 CM |
3386 | } |
3387 | ||
dfe25020 CM |
3388 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
3389 | u64 devid, u8 *dev_uuid) | |
3390 | { | |
3391 | struct btrfs_device *device; | |
3392 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
3393 | ||
3394 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
7cbd8a83 | 3395 | if (!device) |
3396 | return NULL; | |
dfe25020 CM |
3397 | list_add(&device->dev_list, |
3398 | &fs_devices->devices); | |
dfe25020 CM |
3399 | device->dev_root = root->fs_info->dev_root; |
3400 | device->devid = devid; | |
8b712842 | 3401 | device->work.func = pending_bios_fn; |
e4404d6e | 3402 | device->fs_devices = fs_devices; |
cd02dca5 | 3403 | device->missing = 1; |
dfe25020 | 3404 | fs_devices->num_devices++; |
cd02dca5 | 3405 | fs_devices->missing_devices++; |
dfe25020 | 3406 | spin_lock_init(&device->io_lock); |
d20f7043 | 3407 | INIT_LIST_HEAD(&device->dev_alloc_list); |
dfe25020 CM |
3408 | memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE); |
3409 | return device; | |
3410 | } | |
3411 | ||
0b86a832 CM |
3412 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
3413 | struct extent_buffer *leaf, | |
3414 | struct btrfs_chunk *chunk) | |
3415 | { | |
3416 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
3417 | struct map_lookup *map; | |
3418 | struct extent_map *em; | |
3419 | u64 logical; | |
3420 | u64 length; | |
3421 | u64 devid; | |
a443755f | 3422 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 3423 | int num_stripes; |
0b86a832 | 3424 | int ret; |
593060d7 | 3425 | int i; |
0b86a832 | 3426 | |
e17cade2 CM |
3427 | logical = key->offset; |
3428 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 3429 | |
890871be | 3430 | read_lock(&map_tree->map_tree.lock); |
0b86a832 | 3431 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
890871be | 3432 | read_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
3433 | |
3434 | /* already mapped? */ | |
3435 | if (em && em->start <= logical && em->start + em->len > logical) { | |
3436 | free_extent_map(em); | |
0b86a832 CM |
3437 | return 0; |
3438 | } else if (em) { | |
3439 | free_extent_map(em); | |
3440 | } | |
0b86a832 | 3441 | |
0b86a832 CM |
3442 | em = alloc_extent_map(GFP_NOFS); |
3443 | if (!em) | |
3444 | return -ENOMEM; | |
593060d7 CM |
3445 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
3446 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
3447 | if (!map) { |
3448 | free_extent_map(em); | |
3449 | return -ENOMEM; | |
3450 | } | |
3451 | ||
3452 | em->bdev = (struct block_device *)map; | |
3453 | em->start = logical; | |
3454 | em->len = length; | |
3455 | em->block_start = 0; | |
c8b97818 | 3456 | em->block_len = em->len; |
0b86a832 | 3457 | |
593060d7 CM |
3458 | map->num_stripes = num_stripes; |
3459 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
3460 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
3461 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
3462 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
3463 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 3464 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
3465 | for (i = 0; i < num_stripes; i++) { |
3466 | map->stripes[i].physical = | |
3467 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
3468 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
3469 | read_extent_buffer(leaf, uuid, (unsigned long) |
3470 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
3471 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
3472 | map->stripes[i].dev = btrfs_find_device(root, devid, uuid, |
3473 | NULL); | |
dfe25020 | 3474 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
593060d7 CM |
3475 | kfree(map); |
3476 | free_extent_map(em); | |
3477 | return -EIO; | |
3478 | } | |
dfe25020 CM |
3479 | if (!map->stripes[i].dev) { |
3480 | map->stripes[i].dev = | |
3481 | add_missing_dev(root, devid, uuid); | |
3482 | if (!map->stripes[i].dev) { | |
3483 | kfree(map); | |
3484 | free_extent_map(em); | |
3485 | return -EIO; | |
3486 | } | |
3487 | } | |
3488 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
3489 | } |
3490 | ||
890871be | 3491 | write_lock(&map_tree->map_tree.lock); |
0b86a832 | 3492 | ret = add_extent_mapping(&map_tree->map_tree, em); |
890871be | 3493 | write_unlock(&map_tree->map_tree.lock); |
b248a415 | 3494 | BUG_ON(ret); |
0b86a832 CM |
3495 | free_extent_map(em); |
3496 | ||
3497 | return 0; | |
3498 | } | |
3499 | ||
3500 | static int fill_device_from_item(struct extent_buffer *leaf, | |
3501 | struct btrfs_dev_item *dev_item, | |
3502 | struct btrfs_device *device) | |
3503 | { | |
3504 | unsigned long ptr; | |
0b86a832 CM |
3505 | |
3506 | device->devid = btrfs_device_id(leaf, dev_item); | |
d6397bae CB |
3507 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
3508 | device->total_bytes = device->disk_total_bytes; | |
0b86a832 CM |
3509 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
3510 | device->type = btrfs_device_type(leaf, dev_item); | |
3511 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
3512 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
3513 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
0b86a832 CM |
3514 | |
3515 | ptr = (unsigned long)btrfs_device_uuid(dev_item); | |
e17cade2 | 3516 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 3517 | |
0b86a832 CM |
3518 | return 0; |
3519 | } | |
3520 | ||
2b82032c YZ |
3521 | static int open_seed_devices(struct btrfs_root *root, u8 *fsid) |
3522 | { | |
3523 | struct btrfs_fs_devices *fs_devices; | |
3524 | int ret; | |
3525 | ||
3526 | mutex_lock(&uuid_mutex); | |
3527 | ||
3528 | fs_devices = root->fs_info->fs_devices->seed; | |
3529 | while (fs_devices) { | |
3530 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
3531 | ret = 0; | |
3532 | goto out; | |
3533 | } | |
3534 | fs_devices = fs_devices->seed; | |
3535 | } | |
3536 | ||
3537 | fs_devices = find_fsid(fsid); | |
3538 | if (!fs_devices) { | |
3539 | ret = -ENOENT; | |
3540 | goto out; | |
3541 | } | |
e4404d6e YZ |
3542 | |
3543 | fs_devices = clone_fs_devices(fs_devices); | |
3544 | if (IS_ERR(fs_devices)) { | |
3545 | ret = PTR_ERR(fs_devices); | |
2b82032c YZ |
3546 | goto out; |
3547 | } | |
3548 | ||
97288f2c | 3549 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
15916de8 | 3550 | root->fs_info->bdev_holder); |
2b82032c YZ |
3551 | if (ret) |
3552 | goto out; | |
3553 | ||
3554 | if (!fs_devices->seeding) { | |
3555 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 3556 | free_fs_devices(fs_devices); |
2b82032c YZ |
3557 | ret = -EINVAL; |
3558 | goto out; | |
3559 | } | |
3560 | ||
3561 | fs_devices->seed = root->fs_info->fs_devices->seed; | |
3562 | root->fs_info->fs_devices->seed = fs_devices; | |
2b82032c YZ |
3563 | out: |
3564 | mutex_unlock(&uuid_mutex); | |
3565 | return ret; | |
3566 | } | |
3567 | ||
0d81ba5d | 3568 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
3569 | struct extent_buffer *leaf, |
3570 | struct btrfs_dev_item *dev_item) | |
3571 | { | |
3572 | struct btrfs_device *device; | |
3573 | u64 devid; | |
3574 | int ret; | |
2b82032c | 3575 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
3576 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
3577 | ||
0b86a832 | 3578 | devid = btrfs_device_id(leaf, dev_item); |
a443755f CM |
3579 | read_extent_buffer(leaf, dev_uuid, |
3580 | (unsigned long)btrfs_device_uuid(dev_item), | |
3581 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
3582 | read_extent_buffer(leaf, fs_uuid, |
3583 | (unsigned long)btrfs_device_fsid(dev_item), | |
3584 | BTRFS_UUID_SIZE); | |
3585 | ||
3586 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { | |
3587 | ret = open_seed_devices(root, fs_uuid); | |
e4404d6e | 3588 | if (ret && !btrfs_test_opt(root, DEGRADED)) |
2b82032c | 3589 | return ret; |
2b82032c YZ |
3590 | } |
3591 | ||
3592 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
3593 | if (!device || !device->bdev) { | |
e4404d6e | 3594 | if (!btrfs_test_opt(root, DEGRADED)) |
2b82032c YZ |
3595 | return -EIO; |
3596 | ||
3597 | if (!device) { | |
d397712b CM |
3598 | printk(KERN_WARNING "warning devid %llu missing\n", |
3599 | (unsigned long long)devid); | |
2b82032c YZ |
3600 | device = add_missing_dev(root, devid, dev_uuid); |
3601 | if (!device) | |
3602 | return -ENOMEM; | |
cd02dca5 CM |
3603 | } else if (!device->missing) { |
3604 | /* | |
3605 | * this happens when a device that was properly setup | |
3606 | * in the device info lists suddenly goes bad. | |
3607 | * device->bdev is NULL, and so we have to set | |
3608 | * device->missing to one here | |
3609 | */ | |
3610 | root->fs_info->fs_devices->missing_devices++; | |
3611 | device->missing = 1; | |
2b82032c YZ |
3612 | } |
3613 | } | |
3614 | ||
3615 | if (device->fs_devices != root->fs_info->fs_devices) { | |
3616 | BUG_ON(device->writeable); | |
3617 | if (device->generation != | |
3618 | btrfs_device_generation(leaf, dev_item)) | |
3619 | return -EINVAL; | |
6324fbf3 | 3620 | } |
0b86a832 CM |
3621 | |
3622 | fill_device_from_item(leaf, dev_item, device); | |
3623 | device->dev_root = root->fs_info->dev_root; | |
dfe25020 | 3624 | device->in_fs_metadata = 1; |
2b82032c YZ |
3625 | if (device->writeable) |
3626 | device->fs_devices->total_rw_bytes += device->total_bytes; | |
0b86a832 | 3627 | ret = 0; |
0b86a832 CM |
3628 | return ret; |
3629 | } | |
3630 | ||
0d81ba5d CM |
3631 | int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf) |
3632 | { | |
3633 | struct btrfs_dev_item *dev_item; | |
3634 | ||
3635 | dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block, | |
3636 | dev_item); | |
3637 | return read_one_dev(root, buf, dev_item); | |
3638 | } | |
3639 | ||
e4404d6e | 3640 | int btrfs_read_sys_array(struct btrfs_root *root) |
0b86a832 CM |
3641 | { |
3642 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
a061fc8d | 3643 | struct extent_buffer *sb; |
0b86a832 | 3644 | struct btrfs_disk_key *disk_key; |
0b86a832 | 3645 | struct btrfs_chunk *chunk; |
84eed90f CM |
3646 | u8 *ptr; |
3647 | unsigned long sb_ptr; | |
3648 | int ret = 0; | |
0b86a832 CM |
3649 | u32 num_stripes; |
3650 | u32 array_size; | |
3651 | u32 len = 0; | |
0b86a832 | 3652 | u32 cur; |
84eed90f | 3653 | struct btrfs_key key; |
0b86a832 | 3654 | |
e4404d6e | 3655 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET, |
a061fc8d CM |
3656 | BTRFS_SUPER_INFO_SIZE); |
3657 | if (!sb) | |
3658 | return -ENOMEM; | |
3659 | btrfs_set_buffer_uptodate(sb); | |
4008c04a CM |
3660 | btrfs_set_buffer_lockdep_class(sb, 0); |
3661 | ||
a061fc8d | 3662 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
3663 | array_size = btrfs_super_sys_array_size(super_copy); |
3664 | ||
0b86a832 CM |
3665 | ptr = super_copy->sys_chunk_array; |
3666 | sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array); | |
3667 | cur = 0; | |
3668 | ||
3669 | while (cur < array_size) { | |
3670 | disk_key = (struct btrfs_disk_key *)ptr; | |
3671 | btrfs_disk_key_to_cpu(&key, disk_key); | |
3672 | ||
a061fc8d | 3673 | len = sizeof(*disk_key); ptr += len; |
0b86a832 CM |
3674 | sb_ptr += len; |
3675 | cur += len; | |
3676 | ||
0d81ba5d | 3677 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
0b86a832 | 3678 | chunk = (struct btrfs_chunk *)sb_ptr; |
0d81ba5d | 3679 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
3680 | if (ret) |
3681 | break; | |
0b86a832 CM |
3682 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); |
3683 | len = btrfs_chunk_item_size(num_stripes); | |
3684 | } else { | |
84eed90f CM |
3685 | ret = -EIO; |
3686 | break; | |
0b86a832 CM |
3687 | } |
3688 | ptr += len; | |
3689 | sb_ptr += len; | |
3690 | cur += len; | |
3691 | } | |
a061fc8d | 3692 | free_extent_buffer(sb); |
84eed90f | 3693 | return ret; |
0b86a832 CM |
3694 | } |
3695 | ||
3696 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
3697 | { | |
3698 | struct btrfs_path *path; | |
3699 | struct extent_buffer *leaf; | |
3700 | struct btrfs_key key; | |
3701 | struct btrfs_key found_key; | |
3702 | int ret; | |
3703 | int slot; | |
3704 | ||
3705 | root = root->fs_info->chunk_root; | |
3706 | ||
3707 | path = btrfs_alloc_path(); | |
3708 | if (!path) | |
3709 | return -ENOMEM; | |
3710 | ||
3711 | /* first we search for all of the device items, and then we | |
3712 | * read in all of the chunk items. This way we can create chunk | |
3713 | * mappings that reference all of the devices that are afound | |
3714 | */ | |
3715 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
3716 | key.offset = 0; | |
3717 | key.type = 0; | |
3718 | again: | |
3719 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
ab59381e ZL |
3720 | if (ret < 0) |
3721 | goto error; | |
d397712b | 3722 | while (1) { |
0b86a832 CM |
3723 | leaf = path->nodes[0]; |
3724 | slot = path->slots[0]; | |
3725 | if (slot >= btrfs_header_nritems(leaf)) { | |
3726 | ret = btrfs_next_leaf(root, path); | |
3727 | if (ret == 0) | |
3728 | continue; | |
3729 | if (ret < 0) | |
3730 | goto error; | |
3731 | break; | |
3732 | } | |
3733 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
3734 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3735 | if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID) | |
3736 | break; | |
3737 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { | |
3738 | struct btrfs_dev_item *dev_item; | |
3739 | dev_item = btrfs_item_ptr(leaf, slot, | |
3740 | struct btrfs_dev_item); | |
0d81ba5d | 3741 | ret = read_one_dev(root, leaf, dev_item); |
2b82032c YZ |
3742 | if (ret) |
3743 | goto error; | |
0b86a832 CM |
3744 | } |
3745 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { | |
3746 | struct btrfs_chunk *chunk; | |
3747 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
3748 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2b82032c YZ |
3749 | if (ret) |
3750 | goto error; | |
0b86a832 CM |
3751 | } |
3752 | path->slots[0]++; | |
3753 | } | |
3754 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3755 | key.objectid = 0; | |
3756 | btrfs_release_path(root, path); | |
3757 | goto again; | |
3758 | } | |
0b86a832 CM |
3759 | ret = 0; |
3760 | error: | |
2b82032c | 3761 | btrfs_free_path(path); |
0b86a832 CM |
3762 | return ret; |
3763 | } |