Commit | Line | Data |
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0b86a832 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | #include <linux/sched.h> | |
19 | #include <linux/bio.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
8a4b83cc | 21 | #include <linux/buffer_head.h> |
f2d8d74d | 22 | #include <linux/blkdev.h> |
788f20eb | 23 | #include <linux/random.h> |
b765ead5 | 24 | #include <linux/iocontext.h> |
6f88a440 | 25 | #include <linux/capability.h> |
593060d7 | 26 | #include <asm/div64.h> |
4b4e25f2 | 27 | #include "compat.h" |
0b86a832 CM |
28 | #include "ctree.h" |
29 | #include "extent_map.h" | |
30 | #include "disk-io.h" | |
31 | #include "transaction.h" | |
32 | #include "print-tree.h" | |
33 | #include "volumes.h" | |
8b712842 | 34 | #include "async-thread.h" |
0b86a832 | 35 | |
2b82032c YZ |
36 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
37 | struct btrfs_root *root, | |
38 | struct btrfs_device *device); | |
39 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); | |
40 | ||
8a4b83cc CM |
41 | static DEFINE_MUTEX(uuid_mutex); |
42 | static LIST_HEAD(fs_uuids); | |
43 | ||
7d9eb12c CM |
44 | static void lock_chunks(struct btrfs_root *root) |
45 | { | |
7d9eb12c CM |
46 | mutex_lock(&root->fs_info->chunk_mutex); |
47 | } | |
48 | ||
49 | static void unlock_chunks(struct btrfs_root *root) | |
50 | { | |
7d9eb12c CM |
51 | mutex_unlock(&root->fs_info->chunk_mutex); |
52 | } | |
53 | ||
e4404d6e YZ |
54 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
55 | { | |
56 | struct btrfs_device *device; | |
57 | WARN_ON(fs_devices->opened); | |
58 | while (!list_empty(&fs_devices->devices)) { | |
59 | device = list_entry(fs_devices->devices.next, | |
60 | struct btrfs_device, dev_list); | |
61 | list_del(&device->dev_list); | |
62 | kfree(device->name); | |
63 | kfree(device); | |
64 | } | |
65 | kfree(fs_devices); | |
66 | } | |
67 | ||
8a4b83cc CM |
68 | int btrfs_cleanup_fs_uuids(void) |
69 | { | |
70 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 71 | |
2b82032c YZ |
72 | while (!list_empty(&fs_uuids)) { |
73 | fs_devices = list_entry(fs_uuids.next, | |
74 | struct btrfs_fs_devices, list); | |
75 | list_del(&fs_devices->list); | |
e4404d6e | 76 | free_fs_devices(fs_devices); |
8a4b83cc CM |
77 | } |
78 | return 0; | |
79 | } | |
80 | ||
a1b32a59 CM |
81 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
82 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
83 | { |
84 | struct btrfs_device *dev; | |
8a4b83cc | 85 | |
c6e30871 | 86 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 87 | if (dev->devid == devid && |
8f18cf13 | 88 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 89 | return dev; |
a443755f | 90 | } |
8a4b83cc CM |
91 | } |
92 | return NULL; | |
93 | } | |
94 | ||
a1b32a59 | 95 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 96 | { |
8a4b83cc CM |
97 | struct btrfs_fs_devices *fs_devices; |
98 | ||
c6e30871 | 99 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
100 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
101 | return fs_devices; | |
102 | } | |
103 | return NULL; | |
104 | } | |
105 | ||
ffbd517d CM |
106 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
107 | struct bio *head, struct bio *tail) | |
108 | { | |
109 | ||
110 | struct bio *old_head; | |
111 | ||
112 | old_head = pending_bios->head; | |
113 | pending_bios->head = head; | |
114 | if (pending_bios->tail) | |
115 | tail->bi_next = old_head; | |
116 | else | |
117 | pending_bios->tail = tail; | |
118 | } | |
119 | ||
8b712842 CM |
120 | /* |
121 | * we try to collect pending bios for a device so we don't get a large | |
122 | * number of procs sending bios down to the same device. This greatly | |
123 | * improves the schedulers ability to collect and merge the bios. | |
124 | * | |
125 | * But, it also turns into a long list of bios to process and that is sure | |
126 | * to eventually make the worker thread block. The solution here is to | |
127 | * make some progress and then put this work struct back at the end of | |
128 | * the list if the block device is congested. This way, multiple devices | |
129 | * can make progress from a single worker thread. | |
130 | */ | |
d397712b | 131 | static noinline int run_scheduled_bios(struct btrfs_device *device) |
8b712842 CM |
132 | { |
133 | struct bio *pending; | |
134 | struct backing_dev_info *bdi; | |
b64a2851 | 135 | struct btrfs_fs_info *fs_info; |
ffbd517d | 136 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
137 | struct bio *tail; |
138 | struct bio *cur; | |
139 | int again = 0; | |
ffbd517d | 140 | unsigned long num_run; |
d644d8a1 | 141 | unsigned long batch_run = 0; |
b64a2851 | 142 | unsigned long limit; |
b765ead5 | 143 | unsigned long last_waited = 0; |
d84275c9 | 144 | int force_reg = 0; |
0e588859 | 145 | int sync_pending = 0; |
211588ad CM |
146 | struct blk_plug plug; |
147 | ||
148 | /* | |
149 | * this function runs all the bios we've collected for | |
150 | * a particular device. We don't want to wander off to | |
151 | * another device without first sending all of these down. | |
152 | * So, setup a plug here and finish it off before we return | |
153 | */ | |
154 | blk_start_plug(&plug); | |
8b712842 | 155 | |
bedf762b | 156 | bdi = blk_get_backing_dev_info(device->bdev); |
b64a2851 CM |
157 | fs_info = device->dev_root->fs_info; |
158 | limit = btrfs_async_submit_limit(fs_info); | |
159 | limit = limit * 2 / 3; | |
160 | ||
8b712842 CM |
161 | loop: |
162 | spin_lock(&device->io_lock); | |
163 | ||
a6837051 | 164 | loop_lock: |
d84275c9 | 165 | num_run = 0; |
ffbd517d | 166 | |
8b712842 CM |
167 | /* take all the bios off the list at once and process them |
168 | * later on (without the lock held). But, remember the | |
169 | * tail and other pointers so the bios can be properly reinserted | |
170 | * into the list if we hit congestion | |
171 | */ | |
d84275c9 | 172 | if (!force_reg && device->pending_sync_bios.head) { |
ffbd517d | 173 | pending_bios = &device->pending_sync_bios; |
d84275c9 CM |
174 | force_reg = 1; |
175 | } else { | |
ffbd517d | 176 | pending_bios = &device->pending_bios; |
d84275c9 CM |
177 | force_reg = 0; |
178 | } | |
ffbd517d CM |
179 | |
180 | pending = pending_bios->head; | |
181 | tail = pending_bios->tail; | |
8b712842 | 182 | WARN_ON(pending && !tail); |
8b712842 CM |
183 | |
184 | /* | |
185 | * if pending was null this time around, no bios need processing | |
186 | * at all and we can stop. Otherwise it'll loop back up again | |
187 | * and do an additional check so no bios are missed. | |
188 | * | |
189 | * device->running_pending is used to synchronize with the | |
190 | * schedule_bio code. | |
191 | */ | |
ffbd517d CM |
192 | if (device->pending_sync_bios.head == NULL && |
193 | device->pending_bios.head == NULL) { | |
8b712842 CM |
194 | again = 0; |
195 | device->running_pending = 0; | |
ffbd517d CM |
196 | } else { |
197 | again = 1; | |
198 | device->running_pending = 1; | |
8b712842 | 199 | } |
ffbd517d CM |
200 | |
201 | pending_bios->head = NULL; | |
202 | pending_bios->tail = NULL; | |
203 | ||
8b712842 CM |
204 | spin_unlock(&device->io_lock); |
205 | ||
d397712b | 206 | while (pending) { |
ffbd517d CM |
207 | |
208 | rmb(); | |
d84275c9 CM |
209 | /* we want to work on both lists, but do more bios on the |
210 | * sync list than the regular list | |
211 | */ | |
212 | if ((num_run > 32 && | |
213 | pending_bios != &device->pending_sync_bios && | |
214 | device->pending_sync_bios.head) || | |
215 | (num_run > 64 && pending_bios == &device->pending_sync_bios && | |
216 | device->pending_bios.head)) { | |
ffbd517d CM |
217 | spin_lock(&device->io_lock); |
218 | requeue_list(pending_bios, pending, tail); | |
219 | goto loop_lock; | |
220 | } | |
221 | ||
8b712842 CM |
222 | cur = pending; |
223 | pending = pending->bi_next; | |
224 | cur->bi_next = NULL; | |
b64a2851 CM |
225 | atomic_dec(&fs_info->nr_async_bios); |
226 | ||
227 | if (atomic_read(&fs_info->nr_async_bios) < limit && | |
228 | waitqueue_active(&fs_info->async_submit_wait)) | |
229 | wake_up(&fs_info->async_submit_wait); | |
492bb6de CM |
230 | |
231 | BUG_ON(atomic_read(&cur->bi_cnt) == 0); | |
d644d8a1 | 232 | |
2ab1ba68 CM |
233 | /* |
234 | * if we're doing the sync list, record that our | |
235 | * plug has some sync requests on it | |
236 | * | |
237 | * If we're doing the regular list and there are | |
238 | * sync requests sitting around, unplug before | |
239 | * we add more | |
240 | */ | |
241 | if (pending_bios == &device->pending_sync_bios) { | |
242 | sync_pending = 1; | |
243 | } else if (sync_pending) { | |
244 | blk_finish_plug(&plug); | |
245 | blk_start_plug(&plug); | |
246 | sync_pending = 0; | |
247 | } | |
248 | ||
5ff7ba3a CM |
249 | submit_bio(cur->bi_rw, cur); |
250 | num_run++; | |
251 | batch_run++; | |
7eaceacc | 252 | if (need_resched()) |
ffbd517d | 253 | cond_resched(); |
8b712842 CM |
254 | |
255 | /* | |
256 | * we made progress, there is more work to do and the bdi | |
257 | * is now congested. Back off and let other work structs | |
258 | * run instead | |
259 | */ | |
57fd5a5f | 260 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
5f2cc086 | 261 | fs_info->fs_devices->open_devices > 1) { |
b765ead5 | 262 | struct io_context *ioc; |
8b712842 | 263 | |
b765ead5 CM |
264 | ioc = current->io_context; |
265 | ||
266 | /* | |
267 | * the main goal here is that we don't want to | |
268 | * block if we're going to be able to submit | |
269 | * more requests without blocking. | |
270 | * | |
271 | * This code does two great things, it pokes into | |
272 | * the elevator code from a filesystem _and_ | |
273 | * it makes assumptions about how batching works. | |
274 | */ | |
275 | if (ioc && ioc->nr_batch_requests > 0 && | |
276 | time_before(jiffies, ioc->last_waited + HZ/50UL) && | |
277 | (last_waited == 0 || | |
278 | ioc->last_waited == last_waited)) { | |
279 | /* | |
280 | * we want to go through our batch of | |
281 | * requests and stop. So, we copy out | |
282 | * the ioc->last_waited time and test | |
283 | * against it before looping | |
284 | */ | |
285 | last_waited = ioc->last_waited; | |
7eaceacc | 286 | if (need_resched()) |
ffbd517d | 287 | cond_resched(); |
b765ead5 CM |
288 | continue; |
289 | } | |
8b712842 | 290 | spin_lock(&device->io_lock); |
ffbd517d | 291 | requeue_list(pending_bios, pending, tail); |
a6837051 | 292 | device->running_pending = 1; |
8b712842 CM |
293 | |
294 | spin_unlock(&device->io_lock); | |
295 | btrfs_requeue_work(&device->work); | |
296 | goto done; | |
297 | } | |
298 | } | |
ffbd517d | 299 | |
51684082 CM |
300 | cond_resched(); |
301 | if (again) | |
302 | goto loop; | |
303 | ||
304 | spin_lock(&device->io_lock); | |
305 | if (device->pending_bios.head || device->pending_sync_bios.head) | |
306 | goto loop_lock; | |
307 | spin_unlock(&device->io_lock); | |
308 | ||
8b712842 | 309 | done: |
211588ad | 310 | blk_finish_plug(&plug); |
8b712842 CM |
311 | return 0; |
312 | } | |
313 | ||
b2950863 | 314 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
315 | { |
316 | struct btrfs_device *device; | |
317 | ||
318 | device = container_of(work, struct btrfs_device, work); | |
319 | run_scheduled_bios(device); | |
320 | } | |
321 | ||
a1b32a59 | 322 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
323 | struct btrfs_super_block *disk_super, |
324 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
325 | { | |
326 | struct btrfs_device *device; | |
327 | struct btrfs_fs_devices *fs_devices; | |
328 | u64 found_transid = btrfs_super_generation(disk_super); | |
3a0524dc | 329 | char *name; |
8a4b83cc CM |
330 | |
331 | fs_devices = find_fsid(disk_super->fsid); | |
332 | if (!fs_devices) { | |
515dc322 | 333 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
8a4b83cc CM |
334 | if (!fs_devices) |
335 | return -ENOMEM; | |
336 | INIT_LIST_HEAD(&fs_devices->devices); | |
b3075717 | 337 | INIT_LIST_HEAD(&fs_devices->alloc_list); |
8a4b83cc CM |
338 | list_add(&fs_devices->list, &fs_uuids); |
339 | memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); | |
340 | fs_devices->latest_devid = devid; | |
341 | fs_devices->latest_trans = found_transid; | |
e5e9a520 | 342 | mutex_init(&fs_devices->device_list_mutex); |
8a4b83cc CM |
343 | device = NULL; |
344 | } else { | |
a443755f CM |
345 | device = __find_device(&fs_devices->devices, devid, |
346 | disk_super->dev_item.uuid); | |
8a4b83cc CM |
347 | } |
348 | if (!device) { | |
2b82032c YZ |
349 | if (fs_devices->opened) |
350 | return -EBUSY; | |
351 | ||
8a4b83cc CM |
352 | device = kzalloc(sizeof(*device), GFP_NOFS); |
353 | if (!device) { | |
354 | /* we can safely leave the fs_devices entry around */ | |
355 | return -ENOMEM; | |
356 | } | |
357 | device->devid = devid; | |
8b712842 | 358 | device->work.func = pending_bios_fn; |
a443755f CM |
359 | memcpy(device->uuid, disk_super->dev_item.uuid, |
360 | BTRFS_UUID_SIZE); | |
b248a415 | 361 | spin_lock_init(&device->io_lock); |
8a4b83cc CM |
362 | device->name = kstrdup(path, GFP_NOFS); |
363 | if (!device->name) { | |
364 | kfree(device); | |
365 | return -ENOMEM; | |
366 | } | |
2b82032c | 367 | INIT_LIST_HEAD(&device->dev_alloc_list); |
e5e9a520 | 368 | |
90519d66 AJ |
369 | /* init readahead state */ |
370 | spin_lock_init(&device->reada_lock); | |
371 | device->reada_curr_zone = NULL; | |
372 | atomic_set(&device->reada_in_flight, 0); | |
373 | device->reada_next = 0; | |
374 | INIT_RADIX_TREE(&device->reada_zones, GFP_NOFS & ~__GFP_WAIT); | |
375 | INIT_RADIX_TREE(&device->reada_extents, GFP_NOFS & ~__GFP_WAIT); | |
376 | ||
e5e9a520 | 377 | mutex_lock(&fs_devices->device_list_mutex); |
1f78160c | 378 | list_add_rcu(&device->dev_list, &fs_devices->devices); |
e5e9a520 CM |
379 | mutex_unlock(&fs_devices->device_list_mutex); |
380 | ||
2b82032c | 381 | device->fs_devices = fs_devices; |
8a4b83cc | 382 | fs_devices->num_devices++; |
cd02dca5 | 383 | } else if (!device->name || strcmp(device->name, path)) { |
3a0524dc TH |
384 | name = kstrdup(path, GFP_NOFS); |
385 | if (!name) | |
386 | return -ENOMEM; | |
387 | kfree(device->name); | |
388 | device->name = name; | |
cd02dca5 CM |
389 | if (device->missing) { |
390 | fs_devices->missing_devices--; | |
391 | device->missing = 0; | |
392 | } | |
8a4b83cc CM |
393 | } |
394 | ||
395 | if (found_transid > fs_devices->latest_trans) { | |
396 | fs_devices->latest_devid = devid; | |
397 | fs_devices->latest_trans = found_transid; | |
398 | } | |
8a4b83cc CM |
399 | *fs_devices_ret = fs_devices; |
400 | return 0; | |
401 | } | |
402 | ||
e4404d6e YZ |
403 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
404 | { | |
405 | struct btrfs_fs_devices *fs_devices; | |
406 | struct btrfs_device *device; | |
407 | struct btrfs_device *orig_dev; | |
408 | ||
409 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); | |
410 | if (!fs_devices) | |
411 | return ERR_PTR(-ENOMEM); | |
412 | ||
413 | INIT_LIST_HEAD(&fs_devices->devices); | |
414 | INIT_LIST_HEAD(&fs_devices->alloc_list); | |
415 | INIT_LIST_HEAD(&fs_devices->list); | |
e5e9a520 | 416 | mutex_init(&fs_devices->device_list_mutex); |
e4404d6e YZ |
417 | fs_devices->latest_devid = orig->latest_devid; |
418 | fs_devices->latest_trans = orig->latest_trans; | |
419 | memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid)); | |
420 | ||
46224705 | 421 | /* We have held the volume lock, it is safe to get the devices. */ |
e4404d6e YZ |
422 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
423 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
424 | if (!device) | |
425 | goto error; | |
426 | ||
427 | device->name = kstrdup(orig_dev->name, GFP_NOFS); | |
fd2696f3 JL |
428 | if (!device->name) { |
429 | kfree(device); | |
e4404d6e | 430 | goto error; |
fd2696f3 | 431 | } |
e4404d6e YZ |
432 | |
433 | device->devid = orig_dev->devid; | |
434 | device->work.func = pending_bios_fn; | |
435 | memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid)); | |
e4404d6e YZ |
436 | spin_lock_init(&device->io_lock); |
437 | INIT_LIST_HEAD(&device->dev_list); | |
438 | INIT_LIST_HEAD(&device->dev_alloc_list); | |
439 | ||
440 | list_add(&device->dev_list, &fs_devices->devices); | |
441 | device->fs_devices = fs_devices; | |
442 | fs_devices->num_devices++; | |
443 | } | |
444 | return fs_devices; | |
445 | error: | |
446 | free_fs_devices(fs_devices); | |
447 | return ERR_PTR(-ENOMEM); | |
448 | } | |
449 | ||
dfe25020 CM |
450 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices) |
451 | { | |
c6e30871 | 452 | struct btrfs_device *device, *next; |
dfe25020 CM |
453 | |
454 | mutex_lock(&uuid_mutex); | |
455 | again: | |
46224705 | 456 | /* This is the initialized path, it is safe to release the devices. */ |
c6e30871 | 457 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
2b82032c YZ |
458 | if (device->in_fs_metadata) |
459 | continue; | |
460 | ||
461 | if (device->bdev) { | |
d4d77629 | 462 | blkdev_put(device->bdev, device->mode); |
2b82032c YZ |
463 | device->bdev = NULL; |
464 | fs_devices->open_devices--; | |
465 | } | |
466 | if (device->writeable) { | |
467 | list_del_init(&device->dev_alloc_list); | |
468 | device->writeable = 0; | |
469 | fs_devices->rw_devices--; | |
470 | } | |
e4404d6e YZ |
471 | list_del_init(&device->dev_list); |
472 | fs_devices->num_devices--; | |
473 | kfree(device->name); | |
474 | kfree(device); | |
dfe25020 | 475 | } |
2b82032c YZ |
476 | |
477 | if (fs_devices->seed) { | |
478 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
479 | goto again; |
480 | } | |
481 | ||
dfe25020 CM |
482 | mutex_unlock(&uuid_mutex); |
483 | return 0; | |
484 | } | |
a0af469b | 485 | |
1f78160c XG |
486 | static void __free_device(struct work_struct *work) |
487 | { | |
488 | struct btrfs_device *device; | |
489 | ||
490 | device = container_of(work, struct btrfs_device, rcu_work); | |
491 | ||
492 | if (device->bdev) | |
493 | blkdev_put(device->bdev, device->mode); | |
494 | ||
495 | kfree(device->name); | |
496 | kfree(device); | |
497 | } | |
498 | ||
499 | static void free_device(struct rcu_head *head) | |
500 | { | |
501 | struct btrfs_device *device; | |
502 | ||
503 | device = container_of(head, struct btrfs_device, rcu); | |
504 | ||
505 | INIT_WORK(&device->rcu_work, __free_device); | |
506 | schedule_work(&device->rcu_work); | |
507 | } | |
508 | ||
2b82032c | 509 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 510 | { |
8a4b83cc | 511 | struct btrfs_device *device; |
e4404d6e | 512 | |
2b82032c YZ |
513 | if (--fs_devices->opened > 0) |
514 | return 0; | |
8a4b83cc | 515 | |
c9513edb | 516 | mutex_lock(&fs_devices->device_list_mutex); |
c6e30871 | 517 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
1f78160c XG |
518 | struct btrfs_device *new_device; |
519 | ||
520 | if (device->bdev) | |
a0af469b | 521 | fs_devices->open_devices--; |
1f78160c | 522 | |
2b82032c YZ |
523 | if (device->writeable) { |
524 | list_del_init(&device->dev_alloc_list); | |
525 | fs_devices->rw_devices--; | |
526 | } | |
527 | ||
d5e2003c JB |
528 | if (device->can_discard) |
529 | fs_devices->num_can_discard--; | |
530 | ||
1f78160c XG |
531 | new_device = kmalloc(sizeof(*new_device), GFP_NOFS); |
532 | BUG_ON(!new_device); | |
533 | memcpy(new_device, device, sizeof(*new_device)); | |
534 | new_device->name = kstrdup(device->name, GFP_NOFS); | |
5f3f302a | 535 | BUG_ON(device->name && !new_device->name); |
1f78160c XG |
536 | new_device->bdev = NULL; |
537 | new_device->writeable = 0; | |
538 | new_device->in_fs_metadata = 0; | |
d5e2003c | 539 | new_device->can_discard = 0; |
1f78160c XG |
540 | list_replace_rcu(&device->dev_list, &new_device->dev_list); |
541 | ||
542 | call_rcu(&device->rcu, free_device); | |
8a4b83cc | 543 | } |
c9513edb XG |
544 | mutex_unlock(&fs_devices->device_list_mutex); |
545 | ||
e4404d6e YZ |
546 | WARN_ON(fs_devices->open_devices); |
547 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
548 | fs_devices->opened = 0; |
549 | fs_devices->seeding = 0; | |
2b82032c | 550 | |
8a4b83cc CM |
551 | return 0; |
552 | } | |
553 | ||
2b82032c YZ |
554 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
555 | { | |
e4404d6e | 556 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
557 | int ret; |
558 | ||
559 | mutex_lock(&uuid_mutex); | |
560 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
561 | if (!fs_devices->opened) { |
562 | seed_devices = fs_devices->seed; | |
563 | fs_devices->seed = NULL; | |
564 | } | |
2b82032c | 565 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
566 | |
567 | while (seed_devices) { | |
568 | fs_devices = seed_devices; | |
569 | seed_devices = fs_devices->seed; | |
570 | __btrfs_close_devices(fs_devices); | |
571 | free_fs_devices(fs_devices); | |
572 | } | |
2b82032c YZ |
573 | return ret; |
574 | } | |
575 | ||
e4404d6e YZ |
576 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
577 | fmode_t flags, void *holder) | |
8a4b83cc | 578 | { |
d5e2003c | 579 | struct request_queue *q; |
8a4b83cc CM |
580 | struct block_device *bdev; |
581 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 582 | struct btrfs_device *device; |
a0af469b CM |
583 | struct block_device *latest_bdev = NULL; |
584 | struct buffer_head *bh; | |
585 | struct btrfs_super_block *disk_super; | |
586 | u64 latest_devid = 0; | |
587 | u64 latest_transid = 0; | |
a0af469b | 588 | u64 devid; |
2b82032c | 589 | int seeding = 1; |
a0af469b | 590 | int ret = 0; |
8a4b83cc | 591 | |
d4d77629 TH |
592 | flags |= FMODE_EXCL; |
593 | ||
c6e30871 | 594 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
595 | if (device->bdev) |
596 | continue; | |
dfe25020 CM |
597 | if (!device->name) |
598 | continue; | |
599 | ||
d4d77629 | 600 | bdev = blkdev_get_by_path(device->name, flags, holder); |
8a4b83cc | 601 | if (IS_ERR(bdev)) { |
d397712b | 602 | printk(KERN_INFO "open %s failed\n", device->name); |
a0af469b | 603 | goto error; |
8a4b83cc | 604 | } |
a061fc8d | 605 | set_blocksize(bdev, 4096); |
a0af469b | 606 | |
a512bbf8 | 607 | bh = btrfs_read_dev_super(bdev); |
20b45077 DY |
608 | if (!bh) { |
609 | ret = -EINVAL; | |
a0af469b | 610 | goto error_close; |
20b45077 | 611 | } |
a0af469b CM |
612 | |
613 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 614 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
a0af469b CM |
615 | if (devid != device->devid) |
616 | goto error_brelse; | |
617 | ||
2b82032c YZ |
618 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
619 | BTRFS_UUID_SIZE)) | |
620 | goto error_brelse; | |
621 | ||
622 | device->generation = btrfs_super_generation(disk_super); | |
623 | if (!latest_transid || device->generation > latest_transid) { | |
a0af469b | 624 | latest_devid = devid; |
2b82032c | 625 | latest_transid = device->generation; |
a0af469b CM |
626 | latest_bdev = bdev; |
627 | } | |
628 | ||
2b82032c YZ |
629 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
630 | device->writeable = 0; | |
631 | } else { | |
632 | device->writeable = !bdev_read_only(bdev); | |
633 | seeding = 0; | |
634 | } | |
635 | ||
d5e2003c JB |
636 | q = bdev_get_queue(bdev); |
637 | if (blk_queue_discard(q)) { | |
638 | device->can_discard = 1; | |
639 | fs_devices->num_can_discard++; | |
640 | } | |
641 | ||
8a4b83cc | 642 | device->bdev = bdev; |
dfe25020 | 643 | device->in_fs_metadata = 0; |
15916de8 CM |
644 | device->mode = flags; |
645 | ||
c289811c CM |
646 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
647 | fs_devices->rotating = 1; | |
648 | ||
a0af469b | 649 | fs_devices->open_devices++; |
2b82032c YZ |
650 | if (device->writeable) { |
651 | fs_devices->rw_devices++; | |
652 | list_add(&device->dev_alloc_list, | |
653 | &fs_devices->alloc_list); | |
654 | } | |
4f6c9328 | 655 | brelse(bh); |
a0af469b | 656 | continue; |
a061fc8d | 657 | |
a0af469b CM |
658 | error_brelse: |
659 | brelse(bh); | |
660 | error_close: | |
d4d77629 | 661 | blkdev_put(bdev, flags); |
a0af469b CM |
662 | error: |
663 | continue; | |
8a4b83cc | 664 | } |
a0af469b CM |
665 | if (fs_devices->open_devices == 0) { |
666 | ret = -EIO; | |
667 | goto out; | |
668 | } | |
2b82032c YZ |
669 | fs_devices->seeding = seeding; |
670 | fs_devices->opened = 1; | |
a0af469b CM |
671 | fs_devices->latest_bdev = latest_bdev; |
672 | fs_devices->latest_devid = latest_devid; | |
673 | fs_devices->latest_trans = latest_transid; | |
2b82032c | 674 | fs_devices->total_rw_bytes = 0; |
a0af469b | 675 | out: |
2b82032c YZ |
676 | return ret; |
677 | } | |
678 | ||
679 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 680 | fmode_t flags, void *holder) |
2b82032c YZ |
681 | { |
682 | int ret; | |
683 | ||
684 | mutex_lock(&uuid_mutex); | |
685 | if (fs_devices->opened) { | |
e4404d6e YZ |
686 | fs_devices->opened++; |
687 | ret = 0; | |
2b82032c | 688 | } else { |
15916de8 | 689 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 690 | } |
8a4b83cc | 691 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
692 | return ret; |
693 | } | |
694 | ||
97288f2c | 695 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
696 | struct btrfs_fs_devices **fs_devices_ret) |
697 | { | |
698 | struct btrfs_super_block *disk_super; | |
699 | struct block_device *bdev; | |
700 | struct buffer_head *bh; | |
701 | int ret; | |
702 | u64 devid; | |
f2984462 | 703 | u64 transid; |
8a4b83cc CM |
704 | |
705 | mutex_lock(&uuid_mutex); | |
706 | ||
d4d77629 TH |
707 | flags |= FMODE_EXCL; |
708 | bdev = blkdev_get_by_path(path, flags, holder); | |
8a4b83cc CM |
709 | |
710 | if (IS_ERR(bdev)) { | |
8a4b83cc CM |
711 | ret = PTR_ERR(bdev); |
712 | goto error; | |
713 | } | |
714 | ||
715 | ret = set_blocksize(bdev, 4096); | |
716 | if (ret) | |
717 | goto error_close; | |
a512bbf8 | 718 | bh = btrfs_read_dev_super(bdev); |
8a4b83cc | 719 | if (!bh) { |
20b45077 | 720 | ret = -EINVAL; |
8a4b83cc CM |
721 | goto error_close; |
722 | } | |
723 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 724 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
f2984462 | 725 | transid = btrfs_super_generation(disk_super); |
7ae9c09d | 726 | if (disk_super->label[0]) |
d397712b | 727 | printk(KERN_INFO "device label %s ", disk_super->label); |
22b63a29 ID |
728 | else |
729 | printk(KERN_INFO "device fsid %pU ", disk_super->fsid); | |
119e10cf | 730 | printk(KERN_CONT "devid %llu transid %llu %s\n", |
d397712b | 731 | (unsigned long long)devid, (unsigned long long)transid, path); |
8a4b83cc CM |
732 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
733 | ||
8a4b83cc CM |
734 | brelse(bh); |
735 | error_close: | |
d4d77629 | 736 | blkdev_put(bdev, flags); |
8a4b83cc CM |
737 | error: |
738 | mutex_unlock(&uuid_mutex); | |
739 | return ret; | |
740 | } | |
0b86a832 | 741 | |
6d07bcec MX |
742 | /* helper to account the used device space in the range */ |
743 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, | |
744 | u64 end, u64 *length) | |
745 | { | |
746 | struct btrfs_key key; | |
747 | struct btrfs_root *root = device->dev_root; | |
748 | struct btrfs_dev_extent *dev_extent; | |
749 | struct btrfs_path *path; | |
750 | u64 extent_end; | |
751 | int ret; | |
752 | int slot; | |
753 | struct extent_buffer *l; | |
754 | ||
755 | *length = 0; | |
756 | ||
757 | if (start >= device->total_bytes) | |
758 | return 0; | |
759 | ||
760 | path = btrfs_alloc_path(); | |
761 | if (!path) | |
762 | return -ENOMEM; | |
763 | path->reada = 2; | |
764 | ||
765 | key.objectid = device->devid; | |
766 | key.offset = start; | |
767 | key.type = BTRFS_DEV_EXTENT_KEY; | |
768 | ||
769 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
770 | if (ret < 0) | |
771 | goto out; | |
772 | if (ret > 0) { | |
773 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
774 | if (ret < 0) | |
775 | goto out; | |
776 | } | |
777 | ||
778 | while (1) { | |
779 | l = path->nodes[0]; | |
780 | slot = path->slots[0]; | |
781 | if (slot >= btrfs_header_nritems(l)) { | |
782 | ret = btrfs_next_leaf(root, path); | |
783 | if (ret == 0) | |
784 | continue; | |
785 | if (ret < 0) | |
786 | goto out; | |
787 | ||
788 | break; | |
789 | } | |
790 | btrfs_item_key_to_cpu(l, &key, slot); | |
791 | ||
792 | if (key.objectid < device->devid) | |
793 | goto next; | |
794 | ||
795 | if (key.objectid > device->devid) | |
796 | break; | |
797 | ||
798 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) | |
799 | goto next; | |
800 | ||
801 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
802 | extent_end = key.offset + btrfs_dev_extent_length(l, | |
803 | dev_extent); | |
804 | if (key.offset <= start && extent_end > end) { | |
805 | *length = end - start + 1; | |
806 | break; | |
807 | } else if (key.offset <= start && extent_end > start) | |
808 | *length += extent_end - start; | |
809 | else if (key.offset > start && extent_end <= end) | |
810 | *length += extent_end - key.offset; | |
811 | else if (key.offset > start && key.offset <= end) { | |
812 | *length += end - key.offset + 1; | |
813 | break; | |
814 | } else if (key.offset > end) | |
815 | break; | |
816 | ||
817 | next: | |
818 | path->slots[0]++; | |
819 | } | |
820 | ret = 0; | |
821 | out: | |
822 | btrfs_free_path(path); | |
823 | return ret; | |
824 | } | |
825 | ||
0b86a832 | 826 | /* |
7bfc837d MX |
827 | * find_free_dev_extent - find free space in the specified device |
828 | * @trans: transaction handler | |
829 | * @device: the device which we search the free space in | |
830 | * @num_bytes: the size of the free space that we need | |
831 | * @start: store the start of the free space. | |
832 | * @len: the size of the free space. that we find, or the size of the max | |
833 | * free space if we don't find suitable free space | |
834 | * | |
0b86a832 CM |
835 | * this uses a pretty simple search, the expectation is that it is |
836 | * called very infrequently and that a given device has a small number | |
837 | * of extents | |
7bfc837d MX |
838 | * |
839 | * @start is used to store the start of the free space if we find. But if we | |
840 | * don't find suitable free space, it will be used to store the start position | |
841 | * of the max free space. | |
842 | * | |
843 | * @len is used to store the size of the free space that we find. | |
844 | * But if we don't find suitable free space, it is used to store the size of | |
845 | * the max free space. | |
0b86a832 | 846 | */ |
ba1bf481 JB |
847 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
848 | struct btrfs_device *device, u64 num_bytes, | |
7bfc837d | 849 | u64 *start, u64 *len) |
0b86a832 CM |
850 | { |
851 | struct btrfs_key key; | |
852 | struct btrfs_root *root = device->dev_root; | |
7bfc837d | 853 | struct btrfs_dev_extent *dev_extent; |
2b82032c | 854 | struct btrfs_path *path; |
7bfc837d MX |
855 | u64 hole_size; |
856 | u64 max_hole_start; | |
857 | u64 max_hole_size; | |
858 | u64 extent_end; | |
859 | u64 search_start; | |
0b86a832 CM |
860 | u64 search_end = device->total_bytes; |
861 | int ret; | |
7bfc837d | 862 | int slot; |
0b86a832 CM |
863 | struct extent_buffer *l; |
864 | ||
0b86a832 CM |
865 | /* FIXME use last free of some kind */ |
866 | ||
8a4b83cc CM |
867 | /* we don't want to overwrite the superblock on the drive, |
868 | * so we make sure to start at an offset of at least 1MB | |
869 | */ | |
a9c9bf68 | 870 | search_start = max(root->fs_info->alloc_start, 1024ull * 1024); |
8f18cf13 | 871 | |
7bfc837d MX |
872 | max_hole_start = search_start; |
873 | max_hole_size = 0; | |
38c01b96 | 874 | hole_size = 0; |
7bfc837d MX |
875 | |
876 | if (search_start >= search_end) { | |
877 | ret = -ENOSPC; | |
878 | goto error; | |
879 | } | |
880 | ||
881 | path = btrfs_alloc_path(); | |
882 | if (!path) { | |
883 | ret = -ENOMEM; | |
884 | goto error; | |
885 | } | |
886 | path->reada = 2; | |
887 | ||
0b86a832 CM |
888 | key.objectid = device->devid; |
889 | key.offset = search_start; | |
890 | key.type = BTRFS_DEV_EXTENT_KEY; | |
7bfc837d | 891 | |
0b86a832 CM |
892 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); |
893 | if (ret < 0) | |
7bfc837d | 894 | goto out; |
1fcbac58 YZ |
895 | if (ret > 0) { |
896 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
897 | if (ret < 0) | |
7bfc837d | 898 | goto out; |
1fcbac58 | 899 | } |
7bfc837d | 900 | |
0b86a832 CM |
901 | while (1) { |
902 | l = path->nodes[0]; | |
903 | slot = path->slots[0]; | |
904 | if (slot >= btrfs_header_nritems(l)) { | |
905 | ret = btrfs_next_leaf(root, path); | |
906 | if (ret == 0) | |
907 | continue; | |
908 | if (ret < 0) | |
7bfc837d MX |
909 | goto out; |
910 | ||
911 | break; | |
0b86a832 CM |
912 | } |
913 | btrfs_item_key_to_cpu(l, &key, slot); | |
914 | ||
915 | if (key.objectid < device->devid) | |
916 | goto next; | |
917 | ||
918 | if (key.objectid > device->devid) | |
7bfc837d | 919 | break; |
0b86a832 | 920 | |
7bfc837d MX |
921 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) |
922 | goto next; | |
9779b72f | 923 | |
7bfc837d MX |
924 | if (key.offset > search_start) { |
925 | hole_size = key.offset - search_start; | |
9779b72f | 926 | |
7bfc837d MX |
927 | if (hole_size > max_hole_size) { |
928 | max_hole_start = search_start; | |
929 | max_hole_size = hole_size; | |
930 | } | |
9779b72f | 931 | |
7bfc837d MX |
932 | /* |
933 | * If this free space is greater than which we need, | |
934 | * it must be the max free space that we have found | |
935 | * until now, so max_hole_start must point to the start | |
936 | * of this free space and the length of this free space | |
937 | * is stored in max_hole_size. Thus, we return | |
938 | * max_hole_start and max_hole_size and go back to the | |
939 | * caller. | |
940 | */ | |
941 | if (hole_size >= num_bytes) { | |
942 | ret = 0; | |
943 | goto out; | |
0b86a832 CM |
944 | } |
945 | } | |
0b86a832 | 946 | |
0b86a832 | 947 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
7bfc837d MX |
948 | extent_end = key.offset + btrfs_dev_extent_length(l, |
949 | dev_extent); | |
950 | if (extent_end > search_start) | |
951 | search_start = extent_end; | |
0b86a832 CM |
952 | next: |
953 | path->slots[0]++; | |
954 | cond_resched(); | |
955 | } | |
0b86a832 | 956 | |
38c01b96 | 957 | /* |
958 | * At this point, search_start should be the end of | |
959 | * allocated dev extents, and when shrinking the device, | |
960 | * search_end may be smaller than search_start. | |
961 | */ | |
962 | if (search_end > search_start) | |
963 | hole_size = search_end - search_start; | |
964 | ||
7bfc837d MX |
965 | if (hole_size > max_hole_size) { |
966 | max_hole_start = search_start; | |
967 | max_hole_size = hole_size; | |
0b86a832 | 968 | } |
0b86a832 | 969 | |
7bfc837d MX |
970 | /* See above. */ |
971 | if (hole_size < num_bytes) | |
972 | ret = -ENOSPC; | |
973 | else | |
974 | ret = 0; | |
975 | ||
976 | out: | |
2b82032c | 977 | btrfs_free_path(path); |
7bfc837d MX |
978 | error: |
979 | *start = max_hole_start; | |
b2117a39 | 980 | if (len) |
7bfc837d | 981 | *len = max_hole_size; |
0b86a832 CM |
982 | return ret; |
983 | } | |
984 | ||
b2950863 | 985 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
986 | struct btrfs_device *device, |
987 | u64 start) | |
988 | { | |
989 | int ret; | |
990 | struct btrfs_path *path; | |
991 | struct btrfs_root *root = device->dev_root; | |
992 | struct btrfs_key key; | |
a061fc8d CM |
993 | struct btrfs_key found_key; |
994 | struct extent_buffer *leaf = NULL; | |
995 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
996 | |
997 | path = btrfs_alloc_path(); | |
998 | if (!path) | |
999 | return -ENOMEM; | |
1000 | ||
1001 | key.objectid = device->devid; | |
1002 | key.offset = start; | |
1003 | key.type = BTRFS_DEV_EXTENT_KEY; | |
1004 | ||
1005 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
a061fc8d CM |
1006 | if (ret > 0) { |
1007 | ret = btrfs_previous_item(root, path, key.objectid, | |
1008 | BTRFS_DEV_EXTENT_KEY); | |
b0b802d7 TI |
1009 | if (ret) |
1010 | goto out; | |
a061fc8d CM |
1011 | leaf = path->nodes[0]; |
1012 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1013 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1014 | struct btrfs_dev_extent); | |
1015 | BUG_ON(found_key.offset > start || found_key.offset + | |
1016 | btrfs_dev_extent_length(leaf, extent) < start); | |
a061fc8d CM |
1017 | } else if (ret == 0) { |
1018 | leaf = path->nodes[0]; | |
1019 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1020 | struct btrfs_dev_extent); | |
1021 | } | |
8f18cf13 CM |
1022 | BUG_ON(ret); |
1023 | ||
dfe25020 CM |
1024 | if (device->bytes_used > 0) |
1025 | device->bytes_used -= btrfs_dev_extent_length(leaf, extent); | |
8f18cf13 | 1026 | ret = btrfs_del_item(trans, root, path); |
8f18cf13 | 1027 | |
b0b802d7 | 1028 | out: |
8f18cf13 CM |
1029 | btrfs_free_path(path); |
1030 | return ret; | |
1031 | } | |
1032 | ||
2b82032c | 1033 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
0b86a832 | 1034 | struct btrfs_device *device, |
e17cade2 | 1035 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 1036 | u64 chunk_offset, u64 start, u64 num_bytes) |
0b86a832 CM |
1037 | { |
1038 | int ret; | |
1039 | struct btrfs_path *path; | |
1040 | struct btrfs_root *root = device->dev_root; | |
1041 | struct btrfs_dev_extent *extent; | |
1042 | struct extent_buffer *leaf; | |
1043 | struct btrfs_key key; | |
1044 | ||
dfe25020 | 1045 | WARN_ON(!device->in_fs_metadata); |
0b86a832 CM |
1046 | path = btrfs_alloc_path(); |
1047 | if (!path) | |
1048 | return -ENOMEM; | |
1049 | ||
0b86a832 | 1050 | key.objectid = device->devid; |
2b82032c | 1051 | key.offset = start; |
0b86a832 CM |
1052 | key.type = BTRFS_DEV_EXTENT_KEY; |
1053 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1054 | sizeof(*extent)); | |
1055 | BUG_ON(ret); | |
1056 | ||
1057 | leaf = path->nodes[0]; | |
1058 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1059 | struct btrfs_dev_extent); | |
e17cade2 CM |
1060 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
1061 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
1062 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
1063 | ||
1064 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
1065 | (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), | |
1066 | BTRFS_UUID_SIZE); | |
1067 | ||
0b86a832 CM |
1068 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
1069 | btrfs_mark_buffer_dirty(leaf); | |
0b86a832 CM |
1070 | btrfs_free_path(path); |
1071 | return ret; | |
1072 | } | |
1073 | ||
a1b32a59 CM |
1074 | static noinline int find_next_chunk(struct btrfs_root *root, |
1075 | u64 objectid, u64 *offset) | |
0b86a832 CM |
1076 | { |
1077 | struct btrfs_path *path; | |
1078 | int ret; | |
1079 | struct btrfs_key key; | |
e17cade2 | 1080 | struct btrfs_chunk *chunk; |
0b86a832 CM |
1081 | struct btrfs_key found_key; |
1082 | ||
1083 | path = btrfs_alloc_path(); | |
92b8e897 MF |
1084 | if (!path) |
1085 | return -ENOMEM; | |
0b86a832 | 1086 | |
e17cade2 | 1087 | key.objectid = objectid; |
0b86a832 CM |
1088 | key.offset = (u64)-1; |
1089 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1090 | ||
1091 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1092 | if (ret < 0) | |
1093 | goto error; | |
1094 | ||
1095 | BUG_ON(ret == 0); | |
1096 | ||
1097 | ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY); | |
1098 | if (ret) { | |
e17cade2 | 1099 | *offset = 0; |
0b86a832 CM |
1100 | } else { |
1101 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1102 | path->slots[0]); | |
e17cade2 CM |
1103 | if (found_key.objectid != objectid) |
1104 | *offset = 0; | |
1105 | else { | |
1106 | chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1107 | struct btrfs_chunk); | |
1108 | *offset = found_key.offset + | |
1109 | btrfs_chunk_length(path->nodes[0], chunk); | |
1110 | } | |
0b86a832 CM |
1111 | } |
1112 | ret = 0; | |
1113 | error: | |
1114 | btrfs_free_path(path); | |
1115 | return ret; | |
1116 | } | |
1117 | ||
2b82032c | 1118 | static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid) |
0b86a832 CM |
1119 | { |
1120 | int ret; | |
1121 | struct btrfs_key key; | |
1122 | struct btrfs_key found_key; | |
2b82032c YZ |
1123 | struct btrfs_path *path; |
1124 | ||
1125 | root = root->fs_info->chunk_root; | |
1126 | ||
1127 | path = btrfs_alloc_path(); | |
1128 | if (!path) | |
1129 | return -ENOMEM; | |
0b86a832 CM |
1130 | |
1131 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1132 | key.type = BTRFS_DEV_ITEM_KEY; | |
1133 | key.offset = (u64)-1; | |
1134 | ||
1135 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1136 | if (ret < 0) | |
1137 | goto error; | |
1138 | ||
1139 | BUG_ON(ret == 0); | |
1140 | ||
1141 | ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID, | |
1142 | BTRFS_DEV_ITEM_KEY); | |
1143 | if (ret) { | |
1144 | *objectid = 1; | |
1145 | } else { | |
1146 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1147 | path->slots[0]); | |
1148 | *objectid = found_key.offset + 1; | |
1149 | } | |
1150 | ret = 0; | |
1151 | error: | |
2b82032c | 1152 | btrfs_free_path(path); |
0b86a832 CM |
1153 | return ret; |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * the device information is stored in the chunk root | |
1158 | * the btrfs_device struct should be fully filled in | |
1159 | */ | |
1160 | int btrfs_add_device(struct btrfs_trans_handle *trans, | |
1161 | struct btrfs_root *root, | |
1162 | struct btrfs_device *device) | |
1163 | { | |
1164 | int ret; | |
1165 | struct btrfs_path *path; | |
1166 | struct btrfs_dev_item *dev_item; | |
1167 | struct extent_buffer *leaf; | |
1168 | struct btrfs_key key; | |
1169 | unsigned long ptr; | |
0b86a832 CM |
1170 | |
1171 | root = root->fs_info->chunk_root; | |
1172 | ||
1173 | path = btrfs_alloc_path(); | |
1174 | if (!path) | |
1175 | return -ENOMEM; | |
1176 | ||
0b86a832 CM |
1177 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1178 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 1179 | key.offset = device->devid; |
0b86a832 CM |
1180 | |
1181 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 1182 | sizeof(*dev_item)); |
0b86a832 CM |
1183 | if (ret) |
1184 | goto out; | |
1185 | ||
1186 | leaf = path->nodes[0]; | |
1187 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1188 | ||
1189 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 1190 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
1191 | btrfs_set_device_type(leaf, dev_item, device->type); |
1192 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1193 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1194 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
1195 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
1196 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
e17cade2 CM |
1197 | btrfs_set_device_group(leaf, dev_item, 0); |
1198 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
1199 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 1200 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 1201 | |
0b86a832 | 1202 | ptr = (unsigned long)btrfs_device_uuid(dev_item); |
e17cade2 | 1203 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
2b82032c YZ |
1204 | ptr = (unsigned long)btrfs_device_fsid(dev_item); |
1205 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); | |
0b86a832 | 1206 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 1207 | |
2b82032c | 1208 | ret = 0; |
0b86a832 CM |
1209 | out: |
1210 | btrfs_free_path(path); | |
1211 | return ret; | |
1212 | } | |
8f18cf13 | 1213 | |
a061fc8d CM |
1214 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
1215 | struct btrfs_device *device) | |
1216 | { | |
1217 | int ret; | |
1218 | struct btrfs_path *path; | |
a061fc8d | 1219 | struct btrfs_key key; |
a061fc8d CM |
1220 | struct btrfs_trans_handle *trans; |
1221 | ||
1222 | root = root->fs_info->chunk_root; | |
1223 | ||
1224 | path = btrfs_alloc_path(); | |
1225 | if (!path) | |
1226 | return -ENOMEM; | |
1227 | ||
a22285a6 | 1228 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1229 | if (IS_ERR(trans)) { |
1230 | btrfs_free_path(path); | |
1231 | return PTR_ERR(trans); | |
1232 | } | |
a061fc8d CM |
1233 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1234 | key.type = BTRFS_DEV_ITEM_KEY; | |
1235 | key.offset = device->devid; | |
7d9eb12c | 1236 | lock_chunks(root); |
a061fc8d CM |
1237 | |
1238 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1239 | if (ret < 0) | |
1240 | goto out; | |
1241 | ||
1242 | if (ret > 0) { | |
1243 | ret = -ENOENT; | |
1244 | goto out; | |
1245 | } | |
1246 | ||
1247 | ret = btrfs_del_item(trans, root, path); | |
1248 | if (ret) | |
1249 | goto out; | |
a061fc8d CM |
1250 | out: |
1251 | btrfs_free_path(path); | |
7d9eb12c | 1252 | unlock_chunks(root); |
a061fc8d CM |
1253 | btrfs_commit_transaction(trans, root); |
1254 | return ret; | |
1255 | } | |
1256 | ||
1257 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
1258 | { | |
1259 | struct btrfs_device *device; | |
2b82032c | 1260 | struct btrfs_device *next_device; |
a061fc8d | 1261 | struct block_device *bdev; |
dfe25020 | 1262 | struct buffer_head *bh = NULL; |
a061fc8d | 1263 | struct btrfs_super_block *disk_super; |
1f78160c | 1264 | struct btrfs_fs_devices *cur_devices; |
a061fc8d CM |
1265 | u64 all_avail; |
1266 | u64 devid; | |
2b82032c YZ |
1267 | u64 num_devices; |
1268 | u8 *dev_uuid; | |
a061fc8d | 1269 | int ret = 0; |
1f78160c | 1270 | bool clear_super = false; |
a061fc8d | 1271 | |
a061fc8d | 1272 | mutex_lock(&uuid_mutex); |
7d9eb12c | 1273 | mutex_lock(&root->fs_info->volume_mutex); |
a061fc8d CM |
1274 | |
1275 | all_avail = root->fs_info->avail_data_alloc_bits | | |
1276 | root->fs_info->avail_system_alloc_bits | | |
1277 | root->fs_info->avail_metadata_alloc_bits; | |
1278 | ||
1279 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && | |
035fe03a | 1280 | root->fs_info->fs_devices->num_devices <= 4) { |
d397712b CM |
1281 | printk(KERN_ERR "btrfs: unable to go below four devices " |
1282 | "on raid10\n"); | |
a061fc8d CM |
1283 | ret = -EINVAL; |
1284 | goto out; | |
1285 | } | |
1286 | ||
1287 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && | |
035fe03a | 1288 | root->fs_info->fs_devices->num_devices <= 2) { |
d397712b CM |
1289 | printk(KERN_ERR "btrfs: unable to go below two " |
1290 | "devices on raid1\n"); | |
a061fc8d CM |
1291 | ret = -EINVAL; |
1292 | goto out; | |
1293 | } | |
1294 | ||
dfe25020 | 1295 | if (strcmp(device_path, "missing") == 0) { |
dfe25020 CM |
1296 | struct list_head *devices; |
1297 | struct btrfs_device *tmp; | |
a061fc8d | 1298 | |
dfe25020 CM |
1299 | device = NULL; |
1300 | devices = &root->fs_info->fs_devices->devices; | |
46224705 XG |
1301 | /* |
1302 | * It is safe to read the devices since the volume_mutex | |
1303 | * is held. | |
1304 | */ | |
c6e30871 | 1305 | list_for_each_entry(tmp, devices, dev_list) { |
dfe25020 CM |
1306 | if (tmp->in_fs_metadata && !tmp->bdev) { |
1307 | device = tmp; | |
1308 | break; | |
1309 | } | |
1310 | } | |
1311 | bdev = NULL; | |
1312 | bh = NULL; | |
1313 | disk_super = NULL; | |
1314 | if (!device) { | |
d397712b CM |
1315 | printk(KERN_ERR "btrfs: no missing devices found to " |
1316 | "remove\n"); | |
dfe25020 CM |
1317 | goto out; |
1318 | } | |
dfe25020 | 1319 | } else { |
d4d77629 TH |
1320 | bdev = blkdev_get_by_path(device_path, FMODE_READ | FMODE_EXCL, |
1321 | root->fs_info->bdev_holder); | |
dfe25020 CM |
1322 | if (IS_ERR(bdev)) { |
1323 | ret = PTR_ERR(bdev); | |
1324 | goto out; | |
1325 | } | |
a061fc8d | 1326 | |
2b82032c | 1327 | set_blocksize(bdev, 4096); |
a512bbf8 | 1328 | bh = btrfs_read_dev_super(bdev); |
dfe25020 | 1329 | if (!bh) { |
20b45077 | 1330 | ret = -EINVAL; |
dfe25020 CM |
1331 | goto error_close; |
1332 | } | |
1333 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 1334 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
2b82032c YZ |
1335 | dev_uuid = disk_super->dev_item.uuid; |
1336 | device = btrfs_find_device(root, devid, dev_uuid, | |
1337 | disk_super->fsid); | |
dfe25020 CM |
1338 | if (!device) { |
1339 | ret = -ENOENT; | |
1340 | goto error_brelse; | |
1341 | } | |
2b82032c | 1342 | } |
dfe25020 | 1343 | |
2b82032c | 1344 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
d397712b CM |
1345 | printk(KERN_ERR "btrfs: unable to remove the only writeable " |
1346 | "device\n"); | |
2b82032c YZ |
1347 | ret = -EINVAL; |
1348 | goto error_brelse; | |
1349 | } | |
1350 | ||
1351 | if (device->writeable) { | |
0c1daee0 | 1352 | lock_chunks(root); |
2b82032c | 1353 | list_del_init(&device->dev_alloc_list); |
0c1daee0 | 1354 | unlock_chunks(root); |
2b82032c | 1355 | root->fs_info->fs_devices->rw_devices--; |
1f78160c | 1356 | clear_super = true; |
dfe25020 | 1357 | } |
a061fc8d CM |
1358 | |
1359 | ret = btrfs_shrink_device(device, 0); | |
1360 | if (ret) | |
9b3517e9 | 1361 | goto error_undo; |
a061fc8d | 1362 | |
a061fc8d CM |
1363 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
1364 | if (ret) | |
9b3517e9 | 1365 | goto error_undo; |
a061fc8d | 1366 | |
2b82032c | 1367 | device->in_fs_metadata = 0; |
a2de733c | 1368 | btrfs_scrub_cancel_dev(root, device); |
e5e9a520 CM |
1369 | |
1370 | /* | |
1371 | * the device list mutex makes sure that we don't change | |
1372 | * the device list while someone else is writing out all | |
1373 | * the device supers. | |
1374 | */ | |
1f78160c XG |
1375 | |
1376 | cur_devices = device->fs_devices; | |
e5e9a520 | 1377 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
1f78160c | 1378 | list_del_rcu(&device->dev_list); |
e5e9a520 | 1379 | |
e4404d6e | 1380 | device->fs_devices->num_devices--; |
2b82032c | 1381 | |
cd02dca5 CM |
1382 | if (device->missing) |
1383 | root->fs_info->fs_devices->missing_devices--; | |
1384 | ||
2b82032c YZ |
1385 | next_device = list_entry(root->fs_info->fs_devices->devices.next, |
1386 | struct btrfs_device, dev_list); | |
1387 | if (device->bdev == root->fs_info->sb->s_bdev) | |
1388 | root->fs_info->sb->s_bdev = next_device->bdev; | |
1389 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) | |
1390 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1391 | ||
1f78160c | 1392 | if (device->bdev) |
e4404d6e | 1393 | device->fs_devices->open_devices--; |
1f78160c XG |
1394 | |
1395 | call_rcu(&device->rcu, free_device); | |
1396 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
e4404d6e | 1397 | |
2b82032c YZ |
1398 | num_devices = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
1399 | btrfs_set_super_num_devices(&root->fs_info->super_copy, num_devices); | |
1400 | ||
1f78160c | 1401 | if (cur_devices->open_devices == 0) { |
e4404d6e YZ |
1402 | struct btrfs_fs_devices *fs_devices; |
1403 | fs_devices = root->fs_info->fs_devices; | |
1404 | while (fs_devices) { | |
1f78160c | 1405 | if (fs_devices->seed == cur_devices) |
e4404d6e YZ |
1406 | break; |
1407 | fs_devices = fs_devices->seed; | |
2b82032c | 1408 | } |
1f78160c XG |
1409 | fs_devices->seed = cur_devices->seed; |
1410 | cur_devices->seed = NULL; | |
0c1daee0 | 1411 | lock_chunks(root); |
1f78160c | 1412 | __btrfs_close_devices(cur_devices); |
0c1daee0 | 1413 | unlock_chunks(root); |
1f78160c | 1414 | free_fs_devices(cur_devices); |
2b82032c YZ |
1415 | } |
1416 | ||
1417 | /* | |
1418 | * at this point, the device is zero sized. We want to | |
1419 | * remove it from the devices list and zero out the old super | |
1420 | */ | |
1f78160c | 1421 | if (clear_super) { |
dfe25020 CM |
1422 | /* make sure this device isn't detected as part of |
1423 | * the FS anymore | |
1424 | */ | |
1425 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
1426 | set_buffer_dirty(bh); | |
1427 | sync_dirty_buffer(bh); | |
dfe25020 | 1428 | } |
a061fc8d | 1429 | |
a061fc8d | 1430 | ret = 0; |
a061fc8d CM |
1431 | |
1432 | error_brelse: | |
1433 | brelse(bh); | |
1434 | error_close: | |
dfe25020 | 1435 | if (bdev) |
e525fd89 | 1436 | blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
a061fc8d | 1437 | out: |
7d9eb12c | 1438 | mutex_unlock(&root->fs_info->volume_mutex); |
a061fc8d | 1439 | mutex_unlock(&uuid_mutex); |
a061fc8d | 1440 | return ret; |
9b3517e9 ID |
1441 | error_undo: |
1442 | if (device->writeable) { | |
0c1daee0 | 1443 | lock_chunks(root); |
9b3517e9 ID |
1444 | list_add(&device->dev_alloc_list, |
1445 | &root->fs_info->fs_devices->alloc_list); | |
0c1daee0 | 1446 | unlock_chunks(root); |
9b3517e9 ID |
1447 | root->fs_info->fs_devices->rw_devices++; |
1448 | } | |
1449 | goto error_brelse; | |
a061fc8d CM |
1450 | } |
1451 | ||
2b82032c YZ |
1452 | /* |
1453 | * does all the dirty work required for changing file system's UUID. | |
1454 | */ | |
1455 | static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans, | |
1456 | struct btrfs_root *root) | |
1457 | { | |
1458 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
1459 | struct btrfs_fs_devices *old_devices; | |
e4404d6e | 1460 | struct btrfs_fs_devices *seed_devices; |
2b82032c YZ |
1461 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
1462 | struct btrfs_device *device; | |
1463 | u64 super_flags; | |
1464 | ||
1465 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 1466 | if (!fs_devices->seeding) |
2b82032c YZ |
1467 | return -EINVAL; |
1468 | ||
e4404d6e YZ |
1469 | seed_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
1470 | if (!seed_devices) | |
2b82032c YZ |
1471 | return -ENOMEM; |
1472 | ||
e4404d6e YZ |
1473 | old_devices = clone_fs_devices(fs_devices); |
1474 | if (IS_ERR(old_devices)) { | |
1475 | kfree(seed_devices); | |
1476 | return PTR_ERR(old_devices); | |
2b82032c | 1477 | } |
e4404d6e | 1478 | |
2b82032c YZ |
1479 | list_add(&old_devices->list, &fs_uuids); |
1480 | ||
e4404d6e YZ |
1481 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
1482 | seed_devices->opened = 1; | |
1483 | INIT_LIST_HEAD(&seed_devices->devices); | |
1484 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
e5e9a520 | 1485 | mutex_init(&seed_devices->device_list_mutex); |
c9513edb XG |
1486 | |
1487 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c XG |
1488 | list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices, |
1489 | synchronize_rcu); | |
c9513edb XG |
1490 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
1491 | ||
e4404d6e YZ |
1492 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); |
1493 | list_for_each_entry(device, &seed_devices->devices, dev_list) { | |
1494 | device->fs_devices = seed_devices; | |
1495 | } | |
1496 | ||
2b82032c YZ |
1497 | fs_devices->seeding = 0; |
1498 | fs_devices->num_devices = 0; | |
1499 | fs_devices->open_devices = 0; | |
e4404d6e | 1500 | fs_devices->seed = seed_devices; |
2b82032c YZ |
1501 | |
1502 | generate_random_uuid(fs_devices->fsid); | |
1503 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1504 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1505 | super_flags = btrfs_super_flags(disk_super) & | |
1506 | ~BTRFS_SUPER_FLAG_SEEDING; | |
1507 | btrfs_set_super_flags(disk_super, super_flags); | |
1508 | ||
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | /* | |
1513 | * strore the expected generation for seed devices in device items. | |
1514 | */ | |
1515 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
1516 | struct btrfs_root *root) | |
1517 | { | |
1518 | struct btrfs_path *path; | |
1519 | struct extent_buffer *leaf; | |
1520 | struct btrfs_dev_item *dev_item; | |
1521 | struct btrfs_device *device; | |
1522 | struct btrfs_key key; | |
1523 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
1524 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
1525 | u64 devid; | |
1526 | int ret; | |
1527 | ||
1528 | path = btrfs_alloc_path(); | |
1529 | if (!path) | |
1530 | return -ENOMEM; | |
1531 | ||
1532 | root = root->fs_info->chunk_root; | |
1533 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1534 | key.offset = 0; | |
1535 | key.type = BTRFS_DEV_ITEM_KEY; | |
1536 | ||
1537 | while (1) { | |
1538 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1539 | if (ret < 0) | |
1540 | goto error; | |
1541 | ||
1542 | leaf = path->nodes[0]; | |
1543 | next_slot: | |
1544 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1545 | ret = btrfs_next_leaf(root, path); | |
1546 | if (ret > 0) | |
1547 | break; | |
1548 | if (ret < 0) | |
1549 | goto error; | |
1550 | leaf = path->nodes[0]; | |
1551 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 1552 | btrfs_release_path(path); |
2b82032c YZ |
1553 | continue; |
1554 | } | |
1555 | ||
1556 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1557 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
1558 | key.type != BTRFS_DEV_ITEM_KEY) | |
1559 | break; | |
1560 | ||
1561 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
1562 | struct btrfs_dev_item); | |
1563 | devid = btrfs_device_id(leaf, dev_item); | |
1564 | read_extent_buffer(leaf, dev_uuid, | |
1565 | (unsigned long)btrfs_device_uuid(dev_item), | |
1566 | BTRFS_UUID_SIZE); | |
1567 | read_extent_buffer(leaf, fs_uuid, | |
1568 | (unsigned long)btrfs_device_fsid(dev_item), | |
1569 | BTRFS_UUID_SIZE); | |
1570 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
1571 | BUG_ON(!device); | |
1572 | ||
1573 | if (device->fs_devices->seeding) { | |
1574 | btrfs_set_device_generation(leaf, dev_item, | |
1575 | device->generation); | |
1576 | btrfs_mark_buffer_dirty(leaf); | |
1577 | } | |
1578 | ||
1579 | path->slots[0]++; | |
1580 | goto next_slot; | |
1581 | } | |
1582 | ret = 0; | |
1583 | error: | |
1584 | btrfs_free_path(path); | |
1585 | return ret; | |
1586 | } | |
1587 | ||
788f20eb CM |
1588 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
1589 | { | |
d5e2003c | 1590 | struct request_queue *q; |
788f20eb CM |
1591 | struct btrfs_trans_handle *trans; |
1592 | struct btrfs_device *device; | |
1593 | struct block_device *bdev; | |
788f20eb | 1594 | struct list_head *devices; |
2b82032c | 1595 | struct super_block *sb = root->fs_info->sb; |
788f20eb | 1596 | u64 total_bytes; |
2b82032c | 1597 | int seeding_dev = 0; |
788f20eb CM |
1598 | int ret = 0; |
1599 | ||
2b82032c YZ |
1600 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
1601 | return -EINVAL; | |
788f20eb | 1602 | |
d4d77629 TH |
1603 | bdev = blkdev_get_by_path(device_path, FMODE_EXCL, |
1604 | root->fs_info->bdev_holder); | |
7f59203a JB |
1605 | if (IS_ERR(bdev)) |
1606 | return PTR_ERR(bdev); | |
a2135011 | 1607 | |
2b82032c YZ |
1608 | if (root->fs_info->fs_devices->seeding) { |
1609 | seeding_dev = 1; | |
1610 | down_write(&sb->s_umount); | |
1611 | mutex_lock(&uuid_mutex); | |
1612 | } | |
1613 | ||
8c8bee1d | 1614 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
7d9eb12c | 1615 | mutex_lock(&root->fs_info->volume_mutex); |
a2135011 | 1616 | |
788f20eb | 1617 | devices = &root->fs_info->fs_devices->devices; |
e5e9a520 CM |
1618 | /* |
1619 | * we have the volume lock, so we don't need the extra | |
1620 | * device list mutex while reading the list here. | |
1621 | */ | |
c6e30871 | 1622 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
1623 | if (device->bdev == bdev) { |
1624 | ret = -EEXIST; | |
2b82032c | 1625 | goto error; |
788f20eb CM |
1626 | } |
1627 | } | |
1628 | ||
1629 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
1630 | if (!device) { | |
1631 | /* we can safely leave the fs_devices entry around */ | |
1632 | ret = -ENOMEM; | |
2b82032c | 1633 | goto error; |
788f20eb CM |
1634 | } |
1635 | ||
788f20eb CM |
1636 | device->name = kstrdup(device_path, GFP_NOFS); |
1637 | if (!device->name) { | |
1638 | kfree(device); | |
2b82032c YZ |
1639 | ret = -ENOMEM; |
1640 | goto error; | |
788f20eb | 1641 | } |
2b82032c YZ |
1642 | |
1643 | ret = find_next_devid(root, &device->devid); | |
1644 | if (ret) { | |
67100f25 | 1645 | kfree(device->name); |
2b82032c YZ |
1646 | kfree(device); |
1647 | goto error; | |
1648 | } | |
1649 | ||
a22285a6 | 1650 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 1651 | if (IS_ERR(trans)) { |
67100f25 | 1652 | kfree(device->name); |
98d5dc13 TI |
1653 | kfree(device); |
1654 | ret = PTR_ERR(trans); | |
1655 | goto error; | |
1656 | } | |
1657 | ||
2b82032c YZ |
1658 | lock_chunks(root); |
1659 | ||
d5e2003c JB |
1660 | q = bdev_get_queue(bdev); |
1661 | if (blk_queue_discard(q)) | |
1662 | device->can_discard = 1; | |
2b82032c YZ |
1663 | device->writeable = 1; |
1664 | device->work.func = pending_bios_fn; | |
1665 | generate_random_uuid(device->uuid); | |
1666 | spin_lock_init(&device->io_lock); | |
1667 | device->generation = trans->transid; | |
788f20eb CM |
1668 | device->io_width = root->sectorsize; |
1669 | device->io_align = root->sectorsize; | |
1670 | device->sector_size = root->sectorsize; | |
1671 | device->total_bytes = i_size_read(bdev->bd_inode); | |
2cc3c559 | 1672 | device->disk_total_bytes = device->total_bytes; |
788f20eb CM |
1673 | device->dev_root = root->fs_info->dev_root; |
1674 | device->bdev = bdev; | |
dfe25020 | 1675 | device->in_fs_metadata = 1; |
fb01aa85 | 1676 | device->mode = FMODE_EXCL; |
2b82032c | 1677 | set_blocksize(device->bdev, 4096); |
788f20eb | 1678 | |
2b82032c YZ |
1679 | if (seeding_dev) { |
1680 | sb->s_flags &= ~MS_RDONLY; | |
1681 | ret = btrfs_prepare_sprout(trans, root); | |
1682 | BUG_ON(ret); | |
1683 | } | |
788f20eb | 1684 | |
2b82032c | 1685 | device->fs_devices = root->fs_info->fs_devices; |
e5e9a520 CM |
1686 | |
1687 | /* | |
1688 | * we don't want write_supers to jump in here with our device | |
1689 | * half setup | |
1690 | */ | |
1691 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c | 1692 | list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices); |
2b82032c YZ |
1693 | list_add(&device->dev_alloc_list, |
1694 | &root->fs_info->fs_devices->alloc_list); | |
1695 | root->fs_info->fs_devices->num_devices++; | |
1696 | root->fs_info->fs_devices->open_devices++; | |
1697 | root->fs_info->fs_devices->rw_devices++; | |
d5e2003c JB |
1698 | if (device->can_discard) |
1699 | root->fs_info->fs_devices->num_can_discard++; | |
2b82032c | 1700 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; |
325cd4ba | 1701 | |
c289811c CM |
1702 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
1703 | root->fs_info->fs_devices->rotating = 1; | |
1704 | ||
788f20eb CM |
1705 | total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
1706 | btrfs_set_super_total_bytes(&root->fs_info->super_copy, | |
1707 | total_bytes + device->total_bytes); | |
1708 | ||
1709 | total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy); | |
1710 | btrfs_set_super_num_devices(&root->fs_info->super_copy, | |
1711 | total_bytes + 1); | |
e5e9a520 | 1712 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 1713 | |
2b82032c YZ |
1714 | if (seeding_dev) { |
1715 | ret = init_first_rw_device(trans, root, device); | |
1716 | BUG_ON(ret); | |
1717 | ret = btrfs_finish_sprout(trans, root); | |
1718 | BUG_ON(ret); | |
1719 | } else { | |
1720 | ret = btrfs_add_device(trans, root, device); | |
1721 | } | |
1722 | ||
913d952e CM |
1723 | /* |
1724 | * we've got more storage, clear any full flags on the space | |
1725 | * infos | |
1726 | */ | |
1727 | btrfs_clear_space_info_full(root->fs_info); | |
1728 | ||
7d9eb12c | 1729 | unlock_chunks(root); |
2b82032c | 1730 | btrfs_commit_transaction(trans, root); |
a2135011 | 1731 | |
2b82032c YZ |
1732 | if (seeding_dev) { |
1733 | mutex_unlock(&uuid_mutex); | |
1734 | up_write(&sb->s_umount); | |
788f20eb | 1735 | |
2b82032c YZ |
1736 | ret = btrfs_relocate_sys_chunks(root); |
1737 | BUG_ON(ret); | |
1738 | } | |
1739 | out: | |
1740 | mutex_unlock(&root->fs_info->volume_mutex); | |
1741 | return ret; | |
1742 | error: | |
e525fd89 | 1743 | blkdev_put(bdev, FMODE_EXCL); |
2b82032c YZ |
1744 | if (seeding_dev) { |
1745 | mutex_unlock(&uuid_mutex); | |
1746 | up_write(&sb->s_umount); | |
1747 | } | |
788f20eb CM |
1748 | goto out; |
1749 | } | |
1750 | ||
d397712b CM |
1751 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
1752 | struct btrfs_device *device) | |
0b86a832 CM |
1753 | { |
1754 | int ret; | |
1755 | struct btrfs_path *path; | |
1756 | struct btrfs_root *root; | |
1757 | struct btrfs_dev_item *dev_item; | |
1758 | struct extent_buffer *leaf; | |
1759 | struct btrfs_key key; | |
1760 | ||
1761 | root = device->dev_root->fs_info->chunk_root; | |
1762 | ||
1763 | path = btrfs_alloc_path(); | |
1764 | if (!path) | |
1765 | return -ENOMEM; | |
1766 | ||
1767 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1768 | key.type = BTRFS_DEV_ITEM_KEY; | |
1769 | key.offset = device->devid; | |
1770 | ||
1771 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1772 | if (ret < 0) | |
1773 | goto out; | |
1774 | ||
1775 | if (ret > 0) { | |
1776 | ret = -ENOENT; | |
1777 | goto out; | |
1778 | } | |
1779 | ||
1780 | leaf = path->nodes[0]; | |
1781 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1782 | ||
1783 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
1784 | btrfs_set_device_type(leaf, dev_item, device->type); | |
1785 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1786 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1787 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
d6397bae | 1788 | btrfs_set_device_total_bytes(leaf, dev_item, device->disk_total_bytes); |
0b86a832 CM |
1789 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); |
1790 | btrfs_mark_buffer_dirty(leaf); | |
1791 | ||
1792 | out: | |
1793 | btrfs_free_path(path); | |
1794 | return ret; | |
1795 | } | |
1796 | ||
7d9eb12c | 1797 | static int __btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
1798 | struct btrfs_device *device, u64 new_size) |
1799 | { | |
1800 | struct btrfs_super_block *super_copy = | |
1801 | &device->dev_root->fs_info->super_copy; | |
1802 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
1803 | u64 diff = new_size - device->total_bytes; | |
1804 | ||
2b82032c YZ |
1805 | if (!device->writeable) |
1806 | return -EACCES; | |
1807 | if (new_size <= device->total_bytes) | |
1808 | return -EINVAL; | |
1809 | ||
8f18cf13 | 1810 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
2b82032c YZ |
1811 | device->fs_devices->total_rw_bytes += diff; |
1812 | ||
1813 | device->total_bytes = new_size; | |
9779b72f | 1814 | device->disk_total_bytes = new_size; |
4184ea7f CM |
1815 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
1816 | ||
8f18cf13 CM |
1817 | return btrfs_update_device(trans, device); |
1818 | } | |
1819 | ||
7d9eb12c CM |
1820 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
1821 | struct btrfs_device *device, u64 new_size) | |
1822 | { | |
1823 | int ret; | |
1824 | lock_chunks(device->dev_root); | |
1825 | ret = __btrfs_grow_device(trans, device, new_size); | |
1826 | unlock_chunks(device->dev_root); | |
1827 | return ret; | |
1828 | } | |
1829 | ||
8f18cf13 CM |
1830 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, |
1831 | struct btrfs_root *root, | |
1832 | u64 chunk_tree, u64 chunk_objectid, | |
1833 | u64 chunk_offset) | |
1834 | { | |
1835 | int ret; | |
1836 | struct btrfs_path *path; | |
1837 | struct btrfs_key key; | |
1838 | ||
1839 | root = root->fs_info->chunk_root; | |
1840 | path = btrfs_alloc_path(); | |
1841 | if (!path) | |
1842 | return -ENOMEM; | |
1843 | ||
1844 | key.objectid = chunk_objectid; | |
1845 | key.offset = chunk_offset; | |
1846 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1847 | ||
1848 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1849 | BUG_ON(ret); | |
1850 | ||
1851 | ret = btrfs_del_item(trans, root, path); | |
8f18cf13 CM |
1852 | |
1853 | btrfs_free_path(path); | |
65a246c5 | 1854 | return ret; |
8f18cf13 CM |
1855 | } |
1856 | ||
b2950863 | 1857 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
8f18cf13 CM |
1858 | chunk_offset) |
1859 | { | |
1860 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
1861 | struct btrfs_disk_key *disk_key; | |
1862 | struct btrfs_chunk *chunk; | |
1863 | u8 *ptr; | |
1864 | int ret = 0; | |
1865 | u32 num_stripes; | |
1866 | u32 array_size; | |
1867 | u32 len = 0; | |
1868 | u32 cur; | |
1869 | struct btrfs_key key; | |
1870 | ||
1871 | array_size = btrfs_super_sys_array_size(super_copy); | |
1872 | ||
1873 | ptr = super_copy->sys_chunk_array; | |
1874 | cur = 0; | |
1875 | ||
1876 | while (cur < array_size) { | |
1877 | disk_key = (struct btrfs_disk_key *)ptr; | |
1878 | btrfs_disk_key_to_cpu(&key, disk_key); | |
1879 | ||
1880 | len = sizeof(*disk_key); | |
1881 | ||
1882 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
1883 | chunk = (struct btrfs_chunk *)(ptr + len); | |
1884 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
1885 | len += btrfs_chunk_item_size(num_stripes); | |
1886 | } else { | |
1887 | ret = -EIO; | |
1888 | break; | |
1889 | } | |
1890 | if (key.objectid == chunk_objectid && | |
1891 | key.offset == chunk_offset) { | |
1892 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
1893 | array_size -= len; | |
1894 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
1895 | } else { | |
1896 | ptr += len; | |
1897 | cur += len; | |
1898 | } | |
1899 | } | |
1900 | return ret; | |
1901 | } | |
1902 | ||
b2950863 | 1903 | static int btrfs_relocate_chunk(struct btrfs_root *root, |
8f18cf13 CM |
1904 | u64 chunk_tree, u64 chunk_objectid, |
1905 | u64 chunk_offset) | |
1906 | { | |
1907 | struct extent_map_tree *em_tree; | |
1908 | struct btrfs_root *extent_root; | |
1909 | struct btrfs_trans_handle *trans; | |
1910 | struct extent_map *em; | |
1911 | struct map_lookup *map; | |
1912 | int ret; | |
1913 | int i; | |
1914 | ||
1915 | root = root->fs_info->chunk_root; | |
1916 | extent_root = root->fs_info->extent_root; | |
1917 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
1918 | ||
ba1bf481 JB |
1919 | ret = btrfs_can_relocate(extent_root, chunk_offset); |
1920 | if (ret) | |
1921 | return -ENOSPC; | |
1922 | ||
8f18cf13 | 1923 | /* step one, relocate all the extents inside this chunk */ |
1a40e23b | 1924 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); |
a22285a6 YZ |
1925 | if (ret) |
1926 | return ret; | |
8f18cf13 | 1927 | |
a22285a6 | 1928 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 1929 | BUG_ON(IS_ERR(trans)); |
8f18cf13 | 1930 | |
7d9eb12c CM |
1931 | lock_chunks(root); |
1932 | ||
8f18cf13 CM |
1933 | /* |
1934 | * step two, delete the device extents and the | |
1935 | * chunk tree entries | |
1936 | */ | |
890871be | 1937 | read_lock(&em_tree->lock); |
8f18cf13 | 1938 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); |
890871be | 1939 | read_unlock(&em_tree->lock); |
8f18cf13 | 1940 | |
a061fc8d CM |
1941 | BUG_ON(em->start > chunk_offset || |
1942 | em->start + em->len < chunk_offset); | |
8f18cf13 CM |
1943 | map = (struct map_lookup *)em->bdev; |
1944 | ||
1945 | for (i = 0; i < map->num_stripes; i++) { | |
1946 | ret = btrfs_free_dev_extent(trans, map->stripes[i].dev, | |
1947 | map->stripes[i].physical); | |
1948 | BUG_ON(ret); | |
a061fc8d | 1949 | |
dfe25020 CM |
1950 | if (map->stripes[i].dev) { |
1951 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
1952 | BUG_ON(ret); | |
1953 | } | |
8f18cf13 CM |
1954 | } |
1955 | ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid, | |
1956 | chunk_offset); | |
1957 | ||
1958 | BUG_ON(ret); | |
1959 | ||
1abe9b8a | 1960 | trace_btrfs_chunk_free(root, map, chunk_offset, em->len); |
1961 | ||
8f18cf13 CM |
1962 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
1963 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
1964 | BUG_ON(ret); | |
8f18cf13 CM |
1965 | } |
1966 | ||
2b82032c YZ |
1967 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset); |
1968 | BUG_ON(ret); | |
1969 | ||
890871be | 1970 | write_lock(&em_tree->lock); |
2b82032c | 1971 | remove_extent_mapping(em_tree, em); |
890871be | 1972 | write_unlock(&em_tree->lock); |
2b82032c YZ |
1973 | |
1974 | kfree(map); | |
1975 | em->bdev = NULL; | |
1976 | ||
1977 | /* once for the tree */ | |
1978 | free_extent_map(em); | |
1979 | /* once for us */ | |
1980 | free_extent_map(em); | |
1981 | ||
1982 | unlock_chunks(root); | |
1983 | btrfs_end_transaction(trans, root); | |
1984 | return 0; | |
1985 | } | |
1986 | ||
1987 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) | |
1988 | { | |
1989 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; | |
1990 | struct btrfs_path *path; | |
1991 | struct extent_buffer *leaf; | |
1992 | struct btrfs_chunk *chunk; | |
1993 | struct btrfs_key key; | |
1994 | struct btrfs_key found_key; | |
1995 | u64 chunk_tree = chunk_root->root_key.objectid; | |
1996 | u64 chunk_type; | |
ba1bf481 JB |
1997 | bool retried = false; |
1998 | int failed = 0; | |
2b82032c YZ |
1999 | int ret; |
2000 | ||
2001 | path = btrfs_alloc_path(); | |
2002 | if (!path) | |
2003 | return -ENOMEM; | |
2004 | ||
ba1bf481 | 2005 | again: |
2b82032c YZ |
2006 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2007 | key.offset = (u64)-1; | |
2008 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2009 | ||
2010 | while (1) { | |
2011 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); | |
2012 | if (ret < 0) | |
2013 | goto error; | |
2014 | BUG_ON(ret == 0); | |
2015 | ||
2016 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
2017 | key.type); | |
2018 | if (ret < 0) | |
2019 | goto error; | |
2020 | if (ret > 0) | |
2021 | break; | |
1a40e23b | 2022 | |
2b82032c YZ |
2023 | leaf = path->nodes[0]; |
2024 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 2025 | |
2b82032c YZ |
2026 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
2027 | struct btrfs_chunk); | |
2028 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
b3b4aa74 | 2029 | btrfs_release_path(path); |
8f18cf13 | 2030 | |
2b82032c YZ |
2031 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2032 | ret = btrfs_relocate_chunk(chunk_root, chunk_tree, | |
2033 | found_key.objectid, | |
2034 | found_key.offset); | |
ba1bf481 JB |
2035 | if (ret == -ENOSPC) |
2036 | failed++; | |
2037 | else if (ret) | |
2038 | BUG(); | |
2b82032c | 2039 | } |
8f18cf13 | 2040 | |
2b82032c YZ |
2041 | if (found_key.offset == 0) |
2042 | break; | |
2043 | key.offset = found_key.offset - 1; | |
2044 | } | |
2045 | ret = 0; | |
ba1bf481 JB |
2046 | if (failed && !retried) { |
2047 | failed = 0; | |
2048 | retried = true; | |
2049 | goto again; | |
2050 | } else if (failed && retried) { | |
2051 | WARN_ON(1); | |
2052 | ret = -ENOSPC; | |
2053 | } | |
2b82032c YZ |
2054 | error: |
2055 | btrfs_free_path(path); | |
2056 | return ret; | |
8f18cf13 CM |
2057 | } |
2058 | ||
ec44a35c CM |
2059 | static u64 div_factor(u64 num, int factor) |
2060 | { | |
2061 | if (factor == 10) | |
2062 | return num; | |
2063 | num *= factor; | |
2064 | do_div(num, 10); | |
2065 | return num; | |
2066 | } | |
2067 | ||
ec44a35c CM |
2068 | int btrfs_balance(struct btrfs_root *dev_root) |
2069 | { | |
2070 | int ret; | |
ec44a35c CM |
2071 | struct list_head *devices = &dev_root->fs_info->fs_devices->devices; |
2072 | struct btrfs_device *device; | |
2073 | u64 old_size; | |
2074 | u64 size_to_free; | |
2075 | struct btrfs_path *path; | |
2076 | struct btrfs_key key; | |
ec44a35c CM |
2077 | struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root; |
2078 | struct btrfs_trans_handle *trans; | |
2079 | struct btrfs_key found_key; | |
2080 | ||
2b82032c YZ |
2081 | if (dev_root->fs_info->sb->s_flags & MS_RDONLY) |
2082 | return -EROFS; | |
ec44a35c | 2083 | |
6f88a440 BH |
2084 | if (!capable(CAP_SYS_ADMIN)) |
2085 | return -EPERM; | |
2086 | ||
7d9eb12c | 2087 | mutex_lock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
2088 | dev_root = dev_root->fs_info->dev_root; |
2089 | ||
ec44a35c | 2090 | /* step one make some room on all the devices */ |
c6e30871 | 2091 | list_for_each_entry(device, devices, dev_list) { |
ec44a35c CM |
2092 | old_size = device->total_bytes; |
2093 | size_to_free = div_factor(old_size, 1); | |
2094 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
2b82032c YZ |
2095 | if (!device->writeable || |
2096 | device->total_bytes - device->bytes_used > size_to_free) | |
ec44a35c CM |
2097 | continue; |
2098 | ||
2099 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
ba1bf481 JB |
2100 | if (ret == -ENOSPC) |
2101 | break; | |
ec44a35c CM |
2102 | BUG_ON(ret); |
2103 | ||
a22285a6 | 2104 | trans = btrfs_start_transaction(dev_root, 0); |
98d5dc13 | 2105 | BUG_ON(IS_ERR(trans)); |
ec44a35c CM |
2106 | |
2107 | ret = btrfs_grow_device(trans, device, old_size); | |
2108 | BUG_ON(ret); | |
2109 | ||
2110 | btrfs_end_transaction(trans, dev_root); | |
2111 | } | |
2112 | ||
2113 | /* step two, relocate all the chunks */ | |
2114 | path = btrfs_alloc_path(); | |
17e9f796 MF |
2115 | if (!path) { |
2116 | ret = -ENOMEM; | |
2117 | goto error; | |
2118 | } | |
ec44a35c CM |
2119 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2120 | key.offset = (u64)-1; | |
2121 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2122 | ||
d397712b | 2123 | while (1) { |
ec44a35c CM |
2124 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
2125 | if (ret < 0) | |
2126 | goto error; | |
2127 | ||
2128 | /* | |
2129 | * this shouldn't happen, it means the last relocate | |
2130 | * failed | |
2131 | */ | |
2132 | if (ret == 0) | |
2133 | break; | |
2134 | ||
2135 | ret = btrfs_previous_item(chunk_root, path, 0, | |
2136 | BTRFS_CHUNK_ITEM_KEY); | |
7d9eb12c | 2137 | if (ret) |
ec44a35c | 2138 | break; |
7d9eb12c | 2139 | |
ec44a35c CM |
2140 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
2141 | path->slots[0]); | |
2142 | if (found_key.objectid != key.objectid) | |
2143 | break; | |
7d9eb12c | 2144 | |
ec44a35c | 2145 | /* chunk zero is special */ |
ba1bf481 | 2146 | if (found_key.offset == 0) |
ec44a35c CM |
2147 | break; |
2148 | ||
b3b4aa74 | 2149 | btrfs_release_path(path); |
ec44a35c CM |
2150 | ret = btrfs_relocate_chunk(chunk_root, |
2151 | chunk_root->root_key.objectid, | |
2152 | found_key.objectid, | |
2153 | found_key.offset); | |
508794eb JB |
2154 | if (ret && ret != -ENOSPC) |
2155 | goto error; | |
ba1bf481 | 2156 | key.offset = found_key.offset - 1; |
ec44a35c CM |
2157 | } |
2158 | ret = 0; | |
2159 | error: | |
2160 | btrfs_free_path(path); | |
7d9eb12c | 2161 | mutex_unlock(&dev_root->fs_info->volume_mutex); |
ec44a35c CM |
2162 | return ret; |
2163 | } | |
2164 | ||
8f18cf13 CM |
2165 | /* |
2166 | * shrinking a device means finding all of the device extents past | |
2167 | * the new size, and then following the back refs to the chunks. | |
2168 | * The chunk relocation code actually frees the device extent | |
2169 | */ | |
2170 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
2171 | { | |
2172 | struct btrfs_trans_handle *trans; | |
2173 | struct btrfs_root *root = device->dev_root; | |
2174 | struct btrfs_dev_extent *dev_extent = NULL; | |
2175 | struct btrfs_path *path; | |
2176 | u64 length; | |
2177 | u64 chunk_tree; | |
2178 | u64 chunk_objectid; | |
2179 | u64 chunk_offset; | |
2180 | int ret; | |
2181 | int slot; | |
ba1bf481 JB |
2182 | int failed = 0; |
2183 | bool retried = false; | |
8f18cf13 CM |
2184 | struct extent_buffer *l; |
2185 | struct btrfs_key key; | |
2186 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
2187 | u64 old_total = btrfs_super_total_bytes(super_copy); | |
ba1bf481 | 2188 | u64 old_size = device->total_bytes; |
8f18cf13 CM |
2189 | u64 diff = device->total_bytes - new_size; |
2190 | ||
2b82032c YZ |
2191 | if (new_size >= device->total_bytes) |
2192 | return -EINVAL; | |
8f18cf13 CM |
2193 | |
2194 | path = btrfs_alloc_path(); | |
2195 | if (!path) | |
2196 | return -ENOMEM; | |
2197 | ||
8f18cf13 CM |
2198 | path->reada = 2; |
2199 | ||
7d9eb12c CM |
2200 | lock_chunks(root); |
2201 | ||
8f18cf13 | 2202 | device->total_bytes = new_size; |
2b82032c YZ |
2203 | if (device->writeable) |
2204 | device->fs_devices->total_rw_bytes -= diff; | |
7d9eb12c | 2205 | unlock_chunks(root); |
8f18cf13 | 2206 | |
ba1bf481 | 2207 | again: |
8f18cf13 CM |
2208 | key.objectid = device->devid; |
2209 | key.offset = (u64)-1; | |
2210 | key.type = BTRFS_DEV_EXTENT_KEY; | |
2211 | ||
2212 | while (1) { | |
2213 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2214 | if (ret < 0) | |
2215 | goto done; | |
2216 | ||
2217 | ret = btrfs_previous_item(root, path, 0, key.type); | |
2218 | if (ret < 0) | |
2219 | goto done; | |
2220 | if (ret) { | |
2221 | ret = 0; | |
b3b4aa74 | 2222 | btrfs_release_path(path); |
bf1fb512 | 2223 | break; |
8f18cf13 CM |
2224 | } |
2225 | ||
2226 | l = path->nodes[0]; | |
2227 | slot = path->slots[0]; | |
2228 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
2229 | ||
ba1bf481 | 2230 | if (key.objectid != device->devid) { |
b3b4aa74 | 2231 | btrfs_release_path(path); |
bf1fb512 | 2232 | break; |
ba1bf481 | 2233 | } |
8f18cf13 CM |
2234 | |
2235 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
2236 | length = btrfs_dev_extent_length(l, dev_extent); | |
2237 | ||
ba1bf481 | 2238 | if (key.offset + length <= new_size) { |
b3b4aa74 | 2239 | btrfs_release_path(path); |
d6397bae | 2240 | break; |
ba1bf481 | 2241 | } |
8f18cf13 CM |
2242 | |
2243 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
2244 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
2245 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
b3b4aa74 | 2246 | btrfs_release_path(path); |
8f18cf13 CM |
2247 | |
2248 | ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid, | |
2249 | chunk_offset); | |
ba1bf481 | 2250 | if (ret && ret != -ENOSPC) |
8f18cf13 | 2251 | goto done; |
ba1bf481 JB |
2252 | if (ret == -ENOSPC) |
2253 | failed++; | |
2254 | key.offset -= 1; | |
2255 | } | |
2256 | ||
2257 | if (failed && !retried) { | |
2258 | failed = 0; | |
2259 | retried = true; | |
2260 | goto again; | |
2261 | } else if (failed && retried) { | |
2262 | ret = -ENOSPC; | |
2263 | lock_chunks(root); | |
2264 | ||
2265 | device->total_bytes = old_size; | |
2266 | if (device->writeable) | |
2267 | device->fs_devices->total_rw_bytes += diff; | |
2268 | unlock_chunks(root); | |
2269 | goto done; | |
8f18cf13 CM |
2270 | } |
2271 | ||
d6397bae | 2272 | /* Shrinking succeeded, else we would be at "done". */ |
a22285a6 | 2273 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
2274 | if (IS_ERR(trans)) { |
2275 | ret = PTR_ERR(trans); | |
2276 | goto done; | |
2277 | } | |
2278 | ||
d6397bae CB |
2279 | lock_chunks(root); |
2280 | ||
2281 | device->disk_total_bytes = new_size; | |
2282 | /* Now btrfs_update_device() will change the on-disk size. */ | |
2283 | ret = btrfs_update_device(trans, device); | |
2284 | if (ret) { | |
2285 | unlock_chunks(root); | |
2286 | btrfs_end_transaction(trans, root); | |
2287 | goto done; | |
2288 | } | |
2289 | WARN_ON(diff > old_total); | |
2290 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
2291 | unlock_chunks(root); | |
2292 | btrfs_end_transaction(trans, root); | |
8f18cf13 CM |
2293 | done: |
2294 | btrfs_free_path(path); | |
2295 | return ret; | |
2296 | } | |
2297 | ||
b2950863 | 2298 | static int btrfs_add_system_chunk(struct btrfs_trans_handle *trans, |
0b86a832 CM |
2299 | struct btrfs_root *root, |
2300 | struct btrfs_key *key, | |
2301 | struct btrfs_chunk *chunk, int item_size) | |
2302 | { | |
2303 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
2304 | struct btrfs_disk_key disk_key; | |
2305 | u32 array_size; | |
2306 | u8 *ptr; | |
2307 | ||
2308 | array_size = btrfs_super_sys_array_size(super_copy); | |
2309 | if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) | |
2310 | return -EFBIG; | |
2311 | ||
2312 | ptr = super_copy->sys_chunk_array + array_size; | |
2313 | btrfs_cpu_key_to_disk(&disk_key, key); | |
2314 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
2315 | ptr += sizeof(disk_key); | |
2316 | memcpy(ptr, chunk, item_size); | |
2317 | item_size += sizeof(disk_key); | |
2318 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
2319 | return 0; | |
2320 | } | |
2321 | ||
73c5de00 AJ |
2322 | /* |
2323 | * sort the devices in descending order by max_avail, total_avail | |
2324 | */ | |
2325 | static int btrfs_cmp_device_info(const void *a, const void *b) | |
9b3f68b9 | 2326 | { |
73c5de00 AJ |
2327 | const struct btrfs_device_info *di_a = a; |
2328 | const struct btrfs_device_info *di_b = b; | |
9b3f68b9 | 2329 | |
73c5de00 | 2330 | if (di_a->max_avail > di_b->max_avail) |
b2117a39 | 2331 | return -1; |
73c5de00 | 2332 | if (di_a->max_avail < di_b->max_avail) |
b2117a39 | 2333 | return 1; |
73c5de00 AJ |
2334 | if (di_a->total_avail > di_b->total_avail) |
2335 | return -1; | |
2336 | if (di_a->total_avail < di_b->total_avail) | |
2337 | return 1; | |
2338 | return 0; | |
b2117a39 | 2339 | } |
0b86a832 | 2340 | |
73c5de00 AJ |
2341 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
2342 | struct btrfs_root *extent_root, | |
2343 | struct map_lookup **map_ret, | |
2344 | u64 *num_bytes_out, u64 *stripe_size_out, | |
2345 | u64 start, u64 type) | |
b2117a39 | 2346 | { |
73c5de00 AJ |
2347 | struct btrfs_fs_info *info = extent_root->fs_info; |
2348 | struct btrfs_fs_devices *fs_devices = info->fs_devices; | |
2349 | struct list_head *cur; | |
2350 | struct map_lookup *map = NULL; | |
2351 | struct extent_map_tree *em_tree; | |
2352 | struct extent_map *em; | |
2353 | struct btrfs_device_info *devices_info = NULL; | |
2354 | u64 total_avail; | |
2355 | int num_stripes; /* total number of stripes to allocate */ | |
2356 | int sub_stripes; /* sub_stripes info for map */ | |
2357 | int dev_stripes; /* stripes per dev */ | |
2358 | int devs_max; /* max devs to use */ | |
2359 | int devs_min; /* min devs needed */ | |
2360 | int devs_increment; /* ndevs has to be a multiple of this */ | |
2361 | int ncopies; /* how many copies to data has */ | |
2362 | int ret; | |
2363 | u64 max_stripe_size; | |
2364 | u64 max_chunk_size; | |
2365 | u64 stripe_size; | |
2366 | u64 num_bytes; | |
2367 | int ndevs; | |
2368 | int i; | |
2369 | int j; | |
593060d7 | 2370 | |
73c5de00 AJ |
2371 | if ((type & BTRFS_BLOCK_GROUP_RAID1) && |
2372 | (type & BTRFS_BLOCK_GROUP_DUP)) { | |
2373 | WARN_ON(1); | |
2374 | type &= ~BTRFS_BLOCK_GROUP_DUP; | |
321aecc6 | 2375 | } |
9b3f68b9 | 2376 | |
73c5de00 AJ |
2377 | if (list_empty(&fs_devices->alloc_list)) |
2378 | return -ENOSPC; | |
b2117a39 | 2379 | |
73c5de00 AJ |
2380 | sub_stripes = 1; |
2381 | dev_stripes = 1; | |
2382 | devs_increment = 1; | |
2383 | ncopies = 1; | |
2384 | devs_max = 0; /* 0 == as many as possible */ | |
2385 | devs_min = 1; | |
2386 | ||
2387 | /* | |
2388 | * define the properties of each RAID type. | |
2389 | * FIXME: move this to a global table and use it in all RAID | |
2390 | * calculation code | |
2391 | */ | |
2392 | if (type & (BTRFS_BLOCK_GROUP_DUP)) { | |
2393 | dev_stripes = 2; | |
b2117a39 | 2394 | ncopies = 2; |
73c5de00 AJ |
2395 | devs_max = 1; |
2396 | } else if (type & (BTRFS_BLOCK_GROUP_RAID0)) { | |
2397 | devs_min = 2; | |
2398 | } else if (type & (BTRFS_BLOCK_GROUP_RAID1)) { | |
2399 | devs_increment = 2; | |
b2117a39 | 2400 | ncopies = 2; |
73c5de00 AJ |
2401 | devs_max = 2; |
2402 | devs_min = 2; | |
2403 | } else if (type & (BTRFS_BLOCK_GROUP_RAID10)) { | |
2404 | sub_stripes = 2; | |
2405 | devs_increment = 2; | |
2406 | ncopies = 2; | |
2407 | devs_min = 4; | |
2408 | } else { | |
2409 | devs_max = 1; | |
2410 | } | |
b2117a39 | 2411 | |
9b3f68b9 | 2412 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
73c5de00 AJ |
2413 | max_stripe_size = 1024 * 1024 * 1024; |
2414 | max_chunk_size = 10 * max_stripe_size; | |
9b3f68b9 | 2415 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
73c5de00 AJ |
2416 | max_stripe_size = 256 * 1024 * 1024; |
2417 | max_chunk_size = max_stripe_size; | |
a40a90a0 | 2418 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
73c5de00 AJ |
2419 | max_stripe_size = 8 * 1024 * 1024; |
2420 | max_chunk_size = 2 * max_stripe_size; | |
2421 | } else { | |
2422 | printk(KERN_ERR "btrfs: invalid chunk type 0x%llx requested\n", | |
2423 | type); | |
2424 | BUG_ON(1); | |
9b3f68b9 CM |
2425 | } |
2426 | ||
2b82032c YZ |
2427 | /* we don't want a chunk larger than 10% of writeable space */ |
2428 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
2429 | max_chunk_size); | |
9b3f68b9 | 2430 | |
73c5de00 AJ |
2431 | devices_info = kzalloc(sizeof(*devices_info) * fs_devices->rw_devices, |
2432 | GFP_NOFS); | |
2433 | if (!devices_info) | |
2434 | return -ENOMEM; | |
0cad8a11 | 2435 | |
73c5de00 | 2436 | cur = fs_devices->alloc_list.next; |
9b3f68b9 | 2437 | |
9f680ce0 | 2438 | /* |
73c5de00 AJ |
2439 | * in the first pass through the devices list, we gather information |
2440 | * about the available holes on each device. | |
9f680ce0 | 2441 | */ |
73c5de00 AJ |
2442 | ndevs = 0; |
2443 | while (cur != &fs_devices->alloc_list) { | |
2444 | struct btrfs_device *device; | |
2445 | u64 max_avail; | |
2446 | u64 dev_offset; | |
b2117a39 | 2447 | |
73c5de00 | 2448 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
9f680ce0 | 2449 | |
73c5de00 | 2450 | cur = cur->next; |
b2117a39 | 2451 | |
73c5de00 AJ |
2452 | if (!device->writeable) { |
2453 | printk(KERN_ERR | |
2454 | "btrfs: read-only device in alloc_list\n"); | |
2455 | WARN_ON(1); | |
2456 | continue; | |
2457 | } | |
b2117a39 | 2458 | |
73c5de00 AJ |
2459 | if (!device->in_fs_metadata) |
2460 | continue; | |
b2117a39 | 2461 | |
73c5de00 AJ |
2462 | if (device->total_bytes > device->bytes_used) |
2463 | total_avail = device->total_bytes - device->bytes_used; | |
2464 | else | |
2465 | total_avail = 0; | |
38c01b96 | 2466 | |
2467 | /* If there is no space on this device, skip it. */ | |
2468 | if (total_avail == 0) | |
2469 | continue; | |
b2117a39 | 2470 | |
73c5de00 AJ |
2471 | ret = find_free_dev_extent(trans, device, |
2472 | max_stripe_size * dev_stripes, | |
2473 | &dev_offset, &max_avail); | |
2474 | if (ret && ret != -ENOSPC) | |
2475 | goto error; | |
b2117a39 | 2476 | |
73c5de00 AJ |
2477 | if (ret == 0) |
2478 | max_avail = max_stripe_size * dev_stripes; | |
b2117a39 | 2479 | |
73c5de00 AJ |
2480 | if (max_avail < BTRFS_STRIPE_LEN * dev_stripes) |
2481 | continue; | |
b2117a39 | 2482 | |
73c5de00 AJ |
2483 | devices_info[ndevs].dev_offset = dev_offset; |
2484 | devices_info[ndevs].max_avail = max_avail; | |
2485 | devices_info[ndevs].total_avail = total_avail; | |
2486 | devices_info[ndevs].dev = device; | |
2487 | ++ndevs; | |
2488 | } | |
b2117a39 | 2489 | |
73c5de00 AJ |
2490 | /* |
2491 | * now sort the devices by hole size / available space | |
2492 | */ | |
2493 | sort(devices_info, ndevs, sizeof(struct btrfs_device_info), | |
2494 | btrfs_cmp_device_info, NULL); | |
b2117a39 | 2495 | |
73c5de00 AJ |
2496 | /* round down to number of usable stripes */ |
2497 | ndevs -= ndevs % devs_increment; | |
b2117a39 | 2498 | |
73c5de00 AJ |
2499 | if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) { |
2500 | ret = -ENOSPC; | |
2501 | goto error; | |
b2117a39 | 2502 | } |
9f680ce0 | 2503 | |
73c5de00 AJ |
2504 | if (devs_max && ndevs > devs_max) |
2505 | ndevs = devs_max; | |
2506 | /* | |
2507 | * the primary goal is to maximize the number of stripes, so use as many | |
2508 | * devices as possible, even if the stripes are not maximum sized. | |
2509 | */ | |
2510 | stripe_size = devices_info[ndevs-1].max_avail; | |
2511 | num_stripes = ndevs * dev_stripes; | |
b2117a39 | 2512 | |
73c5de00 AJ |
2513 | if (stripe_size * num_stripes > max_chunk_size * ncopies) { |
2514 | stripe_size = max_chunk_size * ncopies; | |
2515 | do_div(stripe_size, num_stripes); | |
b2117a39 | 2516 | } |
b2117a39 | 2517 | |
73c5de00 AJ |
2518 | do_div(stripe_size, dev_stripes); |
2519 | do_div(stripe_size, BTRFS_STRIPE_LEN); | |
2520 | stripe_size *= BTRFS_STRIPE_LEN; | |
b2117a39 MX |
2521 | |
2522 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
2523 | if (!map) { | |
2524 | ret = -ENOMEM; | |
2525 | goto error; | |
2526 | } | |
2527 | map->num_stripes = num_stripes; | |
9b3f68b9 | 2528 | |
73c5de00 AJ |
2529 | for (i = 0; i < ndevs; ++i) { |
2530 | for (j = 0; j < dev_stripes; ++j) { | |
2531 | int s = i * dev_stripes + j; | |
2532 | map->stripes[s].dev = devices_info[i].dev; | |
2533 | map->stripes[s].physical = devices_info[i].dev_offset + | |
2534 | j * stripe_size; | |
6324fbf3 | 2535 | } |
6324fbf3 | 2536 | } |
2b82032c | 2537 | map->sector_size = extent_root->sectorsize; |
b2117a39 MX |
2538 | map->stripe_len = BTRFS_STRIPE_LEN; |
2539 | map->io_align = BTRFS_STRIPE_LEN; | |
2540 | map->io_width = BTRFS_STRIPE_LEN; | |
2b82032c | 2541 | map->type = type; |
2b82032c | 2542 | map->sub_stripes = sub_stripes; |
0b86a832 | 2543 | |
2b82032c | 2544 | *map_ret = map; |
73c5de00 | 2545 | num_bytes = stripe_size * (num_stripes / ncopies); |
0b86a832 | 2546 | |
73c5de00 AJ |
2547 | *stripe_size_out = stripe_size; |
2548 | *num_bytes_out = num_bytes; | |
0b86a832 | 2549 | |
73c5de00 | 2550 | trace_btrfs_chunk_alloc(info->chunk_root, map, start, num_bytes); |
1abe9b8a | 2551 | |
172ddd60 | 2552 | em = alloc_extent_map(); |
2b82032c | 2553 | if (!em) { |
b2117a39 MX |
2554 | ret = -ENOMEM; |
2555 | goto error; | |
593060d7 | 2556 | } |
2b82032c YZ |
2557 | em->bdev = (struct block_device *)map; |
2558 | em->start = start; | |
73c5de00 | 2559 | em->len = num_bytes; |
2b82032c YZ |
2560 | em->block_start = 0; |
2561 | em->block_len = em->len; | |
593060d7 | 2562 | |
2b82032c | 2563 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
890871be | 2564 | write_lock(&em_tree->lock); |
2b82032c | 2565 | ret = add_extent_mapping(em_tree, em); |
890871be | 2566 | write_unlock(&em_tree->lock); |
2b82032c YZ |
2567 | BUG_ON(ret); |
2568 | free_extent_map(em); | |
0b86a832 | 2569 | |
2b82032c YZ |
2570 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
2571 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
73c5de00 | 2572 | start, num_bytes); |
2b82032c | 2573 | BUG_ON(ret); |
611f0e00 | 2574 | |
73c5de00 AJ |
2575 | for (i = 0; i < map->num_stripes; ++i) { |
2576 | struct btrfs_device *device; | |
2577 | u64 dev_offset; | |
2578 | ||
2579 | device = map->stripes[i].dev; | |
2580 | dev_offset = map->stripes[i].physical; | |
0b86a832 CM |
2581 | |
2582 | ret = btrfs_alloc_dev_extent(trans, device, | |
2b82032c YZ |
2583 | info->chunk_root->root_key.objectid, |
2584 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
73c5de00 | 2585 | start, dev_offset, stripe_size); |
0b86a832 | 2586 | BUG_ON(ret); |
2b82032c YZ |
2587 | } |
2588 | ||
b2117a39 | 2589 | kfree(devices_info); |
2b82032c | 2590 | return 0; |
b2117a39 MX |
2591 | |
2592 | error: | |
2593 | kfree(map); | |
2594 | kfree(devices_info); | |
2595 | return ret; | |
2b82032c YZ |
2596 | } |
2597 | ||
2598 | static int __finish_chunk_alloc(struct btrfs_trans_handle *trans, | |
2599 | struct btrfs_root *extent_root, | |
2600 | struct map_lookup *map, u64 chunk_offset, | |
2601 | u64 chunk_size, u64 stripe_size) | |
2602 | { | |
2603 | u64 dev_offset; | |
2604 | struct btrfs_key key; | |
2605 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2606 | struct btrfs_device *device; | |
2607 | struct btrfs_chunk *chunk; | |
2608 | struct btrfs_stripe *stripe; | |
2609 | size_t item_size = btrfs_chunk_item_size(map->num_stripes); | |
2610 | int index = 0; | |
2611 | int ret; | |
2612 | ||
2613 | chunk = kzalloc(item_size, GFP_NOFS); | |
2614 | if (!chunk) | |
2615 | return -ENOMEM; | |
2616 | ||
2617 | index = 0; | |
2618 | while (index < map->num_stripes) { | |
2619 | device = map->stripes[index].dev; | |
2620 | device->bytes_used += stripe_size; | |
0b86a832 CM |
2621 | ret = btrfs_update_device(trans, device); |
2622 | BUG_ON(ret); | |
2b82032c YZ |
2623 | index++; |
2624 | } | |
2625 | ||
2626 | index = 0; | |
2627 | stripe = &chunk->stripe; | |
2628 | while (index < map->num_stripes) { | |
2629 | device = map->stripes[index].dev; | |
2630 | dev_offset = map->stripes[index].physical; | |
0b86a832 | 2631 | |
e17cade2 CM |
2632 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
2633 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
2634 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 2635 | stripe++; |
0b86a832 CM |
2636 | index++; |
2637 | } | |
2638 | ||
2b82032c | 2639 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 2640 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
2641 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
2642 | btrfs_set_stack_chunk_type(chunk, map->type); | |
2643 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
2644 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
2645 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b86a832 | 2646 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
2b82032c | 2647 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 2648 | |
2b82032c YZ |
2649 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2650 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2651 | key.offset = chunk_offset; | |
0b86a832 | 2652 | |
2b82032c YZ |
2653 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
2654 | BUG_ON(ret); | |
0b86a832 | 2655 | |
2b82032c YZ |
2656 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2657 | ret = btrfs_add_system_chunk(trans, chunk_root, &key, chunk, | |
2658 | item_size); | |
8f18cf13 CM |
2659 | BUG_ON(ret); |
2660 | } | |
1abe9b8a | 2661 | |
0b86a832 | 2662 | kfree(chunk); |
2b82032c YZ |
2663 | return 0; |
2664 | } | |
0b86a832 | 2665 | |
2b82032c YZ |
2666 | /* |
2667 | * Chunk allocation falls into two parts. The first part does works | |
2668 | * that make the new allocated chunk useable, but not do any operation | |
2669 | * that modifies the chunk tree. The second part does the works that | |
2670 | * require modifying the chunk tree. This division is important for the | |
2671 | * bootstrap process of adding storage to a seed btrfs. | |
2672 | */ | |
2673 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2674 | struct btrfs_root *extent_root, u64 type) | |
2675 | { | |
2676 | u64 chunk_offset; | |
2677 | u64 chunk_size; | |
2678 | u64 stripe_size; | |
2679 | struct map_lookup *map; | |
2680 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
2681 | int ret; | |
2682 | ||
2683 | ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
2684 | &chunk_offset); | |
2685 | if (ret) | |
2686 | return ret; | |
2687 | ||
2688 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2689 | &stripe_size, chunk_offset, type); | |
2690 | if (ret) | |
2691 | return ret; | |
2692 | ||
2693 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2694 | chunk_size, stripe_size); | |
2695 | BUG_ON(ret); | |
2696 | return 0; | |
2697 | } | |
2698 | ||
d397712b | 2699 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
2b82032c YZ |
2700 | struct btrfs_root *root, |
2701 | struct btrfs_device *device) | |
2702 | { | |
2703 | u64 chunk_offset; | |
2704 | u64 sys_chunk_offset; | |
2705 | u64 chunk_size; | |
2706 | u64 sys_chunk_size; | |
2707 | u64 stripe_size; | |
2708 | u64 sys_stripe_size; | |
2709 | u64 alloc_profile; | |
2710 | struct map_lookup *map; | |
2711 | struct map_lookup *sys_map; | |
2712 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2713 | struct btrfs_root *extent_root = fs_info->extent_root; | |
2714 | int ret; | |
2715 | ||
2716 | ret = find_next_chunk(fs_info->chunk_root, | |
2717 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset); | |
92b8e897 MF |
2718 | if (ret) |
2719 | return ret; | |
2b82032c YZ |
2720 | |
2721 | alloc_profile = BTRFS_BLOCK_GROUP_METADATA | | |
2722 | (fs_info->metadata_alloc_profile & | |
2723 | fs_info->avail_metadata_alloc_bits); | |
2724 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2725 | ||
2726 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
2727 | &stripe_size, chunk_offset, alloc_profile); | |
2728 | BUG_ON(ret); | |
2729 | ||
2730 | sys_chunk_offset = chunk_offset + chunk_size; | |
2731 | ||
2732 | alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM | | |
2733 | (fs_info->system_alloc_profile & | |
2734 | fs_info->avail_system_alloc_bits); | |
2735 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); | |
2736 | ||
2737 | ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map, | |
2738 | &sys_chunk_size, &sys_stripe_size, | |
2739 | sys_chunk_offset, alloc_profile); | |
2740 | BUG_ON(ret); | |
2741 | ||
2742 | ret = btrfs_add_device(trans, fs_info->chunk_root, device); | |
2743 | BUG_ON(ret); | |
2744 | ||
2745 | /* | |
2746 | * Modifying chunk tree needs allocating new blocks from both | |
2747 | * system block group and metadata block group. So we only can | |
2748 | * do operations require modifying the chunk tree after both | |
2749 | * block groups were created. | |
2750 | */ | |
2751 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
2752 | chunk_size, stripe_size); | |
2753 | BUG_ON(ret); | |
2754 | ||
2755 | ret = __finish_chunk_alloc(trans, extent_root, sys_map, | |
2756 | sys_chunk_offset, sys_chunk_size, | |
2757 | sys_stripe_size); | |
b248a415 | 2758 | BUG_ON(ret); |
2b82032c YZ |
2759 | return 0; |
2760 | } | |
2761 | ||
2762 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) | |
2763 | { | |
2764 | struct extent_map *em; | |
2765 | struct map_lookup *map; | |
2766 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
2767 | int readonly = 0; | |
2768 | int i; | |
2769 | ||
890871be | 2770 | read_lock(&map_tree->map_tree.lock); |
2b82032c | 2771 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
890871be | 2772 | read_unlock(&map_tree->map_tree.lock); |
2b82032c YZ |
2773 | if (!em) |
2774 | return 1; | |
2775 | ||
f48b9075 JB |
2776 | if (btrfs_test_opt(root, DEGRADED)) { |
2777 | free_extent_map(em); | |
2778 | return 0; | |
2779 | } | |
2780 | ||
2b82032c YZ |
2781 | map = (struct map_lookup *)em->bdev; |
2782 | for (i = 0; i < map->num_stripes; i++) { | |
2783 | if (!map->stripes[i].dev->writeable) { | |
2784 | readonly = 1; | |
2785 | break; | |
2786 | } | |
2787 | } | |
0b86a832 | 2788 | free_extent_map(em); |
2b82032c | 2789 | return readonly; |
0b86a832 CM |
2790 | } |
2791 | ||
2792 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
2793 | { | |
a8067e02 | 2794 | extent_map_tree_init(&tree->map_tree); |
0b86a832 CM |
2795 | } |
2796 | ||
2797 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
2798 | { | |
2799 | struct extent_map *em; | |
2800 | ||
d397712b | 2801 | while (1) { |
890871be | 2802 | write_lock(&tree->map_tree.lock); |
0b86a832 CM |
2803 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
2804 | if (em) | |
2805 | remove_extent_mapping(&tree->map_tree, em); | |
890871be | 2806 | write_unlock(&tree->map_tree.lock); |
0b86a832 CM |
2807 | if (!em) |
2808 | break; | |
2809 | kfree(em->bdev); | |
2810 | /* once for us */ | |
2811 | free_extent_map(em); | |
2812 | /* once for the tree */ | |
2813 | free_extent_map(em); | |
2814 | } | |
2815 | } | |
2816 | ||
f188591e CM |
2817 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len) |
2818 | { | |
2819 | struct extent_map *em; | |
2820 | struct map_lookup *map; | |
2821 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2822 | int ret; | |
2823 | ||
890871be | 2824 | read_lock(&em_tree->lock); |
f188591e | 2825 | em = lookup_extent_mapping(em_tree, logical, len); |
890871be | 2826 | read_unlock(&em_tree->lock); |
f188591e CM |
2827 | BUG_ON(!em); |
2828 | ||
2829 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2830 | map = (struct map_lookup *)em->bdev; | |
2831 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
2832 | ret = map->num_stripes; | |
321aecc6 CM |
2833 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
2834 | ret = map->sub_stripes; | |
f188591e CM |
2835 | else |
2836 | ret = 1; | |
2837 | free_extent_map(em); | |
f188591e CM |
2838 | return ret; |
2839 | } | |
2840 | ||
dfe25020 CM |
2841 | static int find_live_mirror(struct map_lookup *map, int first, int num, |
2842 | int optimal) | |
2843 | { | |
2844 | int i; | |
2845 | if (map->stripes[optimal].dev->bdev) | |
2846 | return optimal; | |
2847 | for (i = first; i < first + num; i++) { | |
2848 | if (map->stripes[i].dev->bdev) | |
2849 | return i; | |
2850 | } | |
2851 | /* we couldn't find one that doesn't fail. Just return something | |
2852 | * and the io error handling code will clean up eventually | |
2853 | */ | |
2854 | return optimal; | |
2855 | } | |
2856 | ||
f2d8d74d CM |
2857 | static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
2858 | u64 logical, u64 *length, | |
2859 | struct btrfs_multi_bio **multi_ret, | |
7eaceacc | 2860 | int mirror_num) |
0b86a832 CM |
2861 | { |
2862 | struct extent_map *em; | |
2863 | struct map_lookup *map; | |
2864 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
2865 | u64 offset; | |
593060d7 | 2866 | u64 stripe_offset; |
fce3bb9a | 2867 | u64 stripe_end_offset; |
593060d7 | 2868 | u64 stripe_nr; |
fce3bb9a LD |
2869 | u64 stripe_nr_orig; |
2870 | u64 stripe_nr_end; | |
cea9e445 | 2871 | int stripes_allocated = 8; |
321aecc6 | 2872 | int stripes_required = 1; |
593060d7 | 2873 | int stripe_index; |
cea9e445 | 2874 | int i; |
f2d8d74d | 2875 | int num_stripes; |
a236aed1 | 2876 | int max_errors = 0; |
cea9e445 | 2877 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 2878 | |
fce3bb9a | 2879 | if (multi_ret && !(rw & (REQ_WRITE | REQ_DISCARD))) |
cea9e445 | 2880 | stripes_allocated = 1; |
cea9e445 CM |
2881 | again: |
2882 | if (multi_ret) { | |
2883 | multi = kzalloc(btrfs_multi_bio_size(stripes_allocated), | |
2884 | GFP_NOFS); | |
2885 | if (!multi) | |
2886 | return -ENOMEM; | |
a236aed1 CM |
2887 | |
2888 | atomic_set(&multi->error, 0); | |
cea9e445 | 2889 | } |
0b86a832 | 2890 | |
890871be | 2891 | read_lock(&em_tree->lock); |
0b86a832 | 2892 | em = lookup_extent_mapping(em_tree, logical, *length); |
890871be | 2893 | read_unlock(&em_tree->lock); |
f2d8d74d | 2894 | |
3b951516 | 2895 | if (!em) { |
d397712b CM |
2896 | printk(KERN_CRIT "unable to find logical %llu len %llu\n", |
2897 | (unsigned long long)logical, | |
2898 | (unsigned long long)*length); | |
f2d8d74d | 2899 | BUG(); |
3b951516 | 2900 | } |
0b86a832 CM |
2901 | |
2902 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
2903 | map = (struct map_lookup *)em->bdev; | |
2904 | offset = logical - em->start; | |
593060d7 | 2905 | |
f188591e CM |
2906 | if (mirror_num > map->num_stripes) |
2907 | mirror_num = 0; | |
2908 | ||
cea9e445 | 2909 | /* if our multi bio struct is too small, back off and try again */ |
7b6d91da | 2910 | if (rw & REQ_WRITE) { |
321aecc6 CM |
2911 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | |
2912 | BTRFS_BLOCK_GROUP_DUP)) { | |
2913 | stripes_required = map->num_stripes; | |
a236aed1 | 2914 | max_errors = 1; |
321aecc6 CM |
2915 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2916 | stripes_required = map->sub_stripes; | |
a236aed1 | 2917 | max_errors = 1; |
321aecc6 CM |
2918 | } |
2919 | } | |
fce3bb9a LD |
2920 | if (rw & REQ_DISCARD) { |
2921 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | | |
2922 | BTRFS_BLOCK_GROUP_RAID1 | | |
2923 | BTRFS_BLOCK_GROUP_DUP | | |
2924 | BTRFS_BLOCK_GROUP_RAID10)) { | |
2925 | stripes_required = map->num_stripes; | |
2926 | } | |
2927 | } | |
2928 | if (multi_ret && (rw & (REQ_WRITE | REQ_DISCARD)) && | |
321aecc6 | 2929 | stripes_allocated < stripes_required) { |
cea9e445 | 2930 | stripes_allocated = map->num_stripes; |
cea9e445 CM |
2931 | free_extent_map(em); |
2932 | kfree(multi); | |
2933 | goto again; | |
2934 | } | |
593060d7 CM |
2935 | stripe_nr = offset; |
2936 | /* | |
2937 | * stripe_nr counts the total number of stripes we have to stride | |
2938 | * to get to this block | |
2939 | */ | |
2940 | do_div(stripe_nr, map->stripe_len); | |
2941 | ||
2942 | stripe_offset = stripe_nr * map->stripe_len; | |
2943 | BUG_ON(offset < stripe_offset); | |
2944 | ||
2945 | /* stripe_offset is the offset of this block in its stripe*/ | |
2946 | stripe_offset = offset - stripe_offset; | |
2947 | ||
fce3bb9a LD |
2948 | if (rw & REQ_DISCARD) |
2949 | *length = min_t(u64, em->len - offset, *length); | |
2950 | else if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | | |
2951 | BTRFS_BLOCK_GROUP_RAID1 | | |
2952 | BTRFS_BLOCK_GROUP_RAID10 | | |
2953 | BTRFS_BLOCK_GROUP_DUP)) { | |
cea9e445 CM |
2954 | /* we limit the length of each bio to what fits in a stripe */ |
2955 | *length = min_t(u64, em->len - offset, | |
fce3bb9a | 2956 | map->stripe_len - stripe_offset); |
cea9e445 CM |
2957 | } else { |
2958 | *length = em->len - offset; | |
2959 | } | |
f2d8d74d | 2960 | |
7eaceacc | 2961 | if (!multi_ret) |
cea9e445 CM |
2962 | goto out; |
2963 | ||
f2d8d74d | 2964 | num_stripes = 1; |
cea9e445 | 2965 | stripe_index = 0; |
fce3bb9a LD |
2966 | stripe_nr_orig = stripe_nr; |
2967 | stripe_nr_end = (offset + *length + map->stripe_len - 1) & | |
2968 | (~(map->stripe_len - 1)); | |
2969 | do_div(stripe_nr_end, map->stripe_len); | |
2970 | stripe_end_offset = stripe_nr_end * map->stripe_len - | |
2971 | (offset + *length); | |
2972 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
2973 | if (rw & REQ_DISCARD) | |
2974 | num_stripes = min_t(u64, map->num_stripes, | |
2975 | stripe_nr_end - stripe_nr_orig); | |
2976 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
2977 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { | |
212a17ab | 2978 | if (rw & (REQ_WRITE | REQ_DISCARD)) |
f2d8d74d | 2979 | num_stripes = map->num_stripes; |
2fff734f | 2980 | else if (mirror_num) |
f188591e | 2981 | stripe_index = mirror_num - 1; |
dfe25020 CM |
2982 | else { |
2983 | stripe_index = find_live_mirror(map, 0, | |
2984 | map->num_stripes, | |
2985 | current->pid % map->num_stripes); | |
2986 | } | |
2fff734f | 2987 | |
611f0e00 | 2988 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
fce3bb9a | 2989 | if (rw & (REQ_WRITE | REQ_DISCARD)) |
f2d8d74d | 2990 | num_stripes = map->num_stripes; |
f188591e CM |
2991 | else if (mirror_num) |
2992 | stripe_index = mirror_num - 1; | |
2fff734f | 2993 | |
321aecc6 CM |
2994 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
2995 | int factor = map->num_stripes / map->sub_stripes; | |
321aecc6 CM |
2996 | |
2997 | stripe_index = do_div(stripe_nr, factor); | |
2998 | stripe_index *= map->sub_stripes; | |
2999 | ||
7eaceacc | 3000 | if (rw & REQ_WRITE) |
f2d8d74d | 3001 | num_stripes = map->sub_stripes; |
fce3bb9a LD |
3002 | else if (rw & REQ_DISCARD) |
3003 | num_stripes = min_t(u64, map->sub_stripes * | |
3004 | (stripe_nr_end - stripe_nr_orig), | |
3005 | map->num_stripes); | |
321aecc6 CM |
3006 | else if (mirror_num) |
3007 | stripe_index += mirror_num - 1; | |
dfe25020 CM |
3008 | else { |
3009 | stripe_index = find_live_mirror(map, stripe_index, | |
3010 | map->sub_stripes, stripe_index + | |
3011 | current->pid % map->sub_stripes); | |
3012 | } | |
8790d502 CM |
3013 | } else { |
3014 | /* | |
3015 | * after this do_div call, stripe_nr is the number of stripes | |
3016 | * on this device we have to walk to find the data, and | |
3017 | * stripe_index is the number of our device in the stripe array | |
3018 | */ | |
3019 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
3020 | } | |
593060d7 | 3021 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 3022 | |
fce3bb9a LD |
3023 | if (rw & REQ_DISCARD) { |
3024 | for (i = 0; i < num_stripes; i++) { | |
f2d8d74d CM |
3025 | multi->stripes[i].physical = |
3026 | map->stripes[stripe_index].physical + | |
3027 | stripe_offset + stripe_nr * map->stripe_len; | |
3028 | multi->stripes[i].dev = map->stripes[stripe_index].dev; | |
fce3bb9a LD |
3029 | |
3030 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3031 | u64 stripes; | |
d9d04879 | 3032 | u32 last_stripe = 0; |
fce3bb9a LD |
3033 | int j; |
3034 | ||
d9d04879 CM |
3035 | div_u64_rem(stripe_nr_end - 1, |
3036 | map->num_stripes, | |
3037 | &last_stripe); | |
3038 | ||
fce3bb9a | 3039 | for (j = 0; j < map->num_stripes; j++) { |
d9d04879 CM |
3040 | u32 test; |
3041 | ||
3042 | div_u64_rem(stripe_nr_end - 1 - j, | |
3043 | map->num_stripes, &test); | |
3044 | if (test == stripe_index) | |
fce3bb9a LD |
3045 | break; |
3046 | } | |
3047 | stripes = stripe_nr_end - 1 - j; | |
3048 | do_div(stripes, map->num_stripes); | |
3049 | multi->stripes[i].length = map->stripe_len * | |
3050 | (stripes - stripe_nr + 1); | |
3051 | ||
3052 | if (i == 0) { | |
3053 | multi->stripes[i].length -= | |
3054 | stripe_offset; | |
3055 | stripe_offset = 0; | |
3056 | } | |
3057 | if (stripe_index == last_stripe) | |
3058 | multi->stripes[i].length -= | |
3059 | stripe_end_offset; | |
3060 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
3061 | u64 stripes; | |
3062 | int j; | |
3063 | int factor = map->num_stripes / | |
3064 | map->sub_stripes; | |
d9d04879 CM |
3065 | u32 last_stripe = 0; |
3066 | ||
3067 | div_u64_rem(stripe_nr_end - 1, | |
3068 | factor, &last_stripe); | |
fce3bb9a LD |
3069 | last_stripe *= map->sub_stripes; |
3070 | ||
3071 | for (j = 0; j < factor; j++) { | |
d9d04879 CM |
3072 | u32 test; |
3073 | ||
3074 | div_u64_rem(stripe_nr_end - 1 - j, | |
3075 | factor, &test); | |
3076 | ||
3077 | if (test == | |
fce3bb9a LD |
3078 | stripe_index / map->sub_stripes) |
3079 | break; | |
3080 | } | |
3081 | stripes = stripe_nr_end - 1 - j; | |
3082 | do_div(stripes, factor); | |
3083 | multi->stripes[i].length = map->stripe_len * | |
3084 | (stripes - stripe_nr + 1); | |
3085 | ||
3086 | if (i < map->sub_stripes) { | |
3087 | multi->stripes[i].length -= | |
3088 | stripe_offset; | |
3089 | if (i == map->sub_stripes - 1) | |
3090 | stripe_offset = 0; | |
3091 | } | |
3092 | if (stripe_index >= last_stripe && | |
3093 | stripe_index <= (last_stripe + | |
3094 | map->sub_stripes - 1)) { | |
3095 | multi->stripes[i].length -= | |
3096 | stripe_end_offset; | |
3097 | } | |
3098 | } else | |
3099 | multi->stripes[i].length = *length; | |
3100 | ||
3101 | stripe_index++; | |
3102 | if (stripe_index == map->num_stripes) { | |
3103 | /* This could only happen for RAID0/10 */ | |
3104 | stripe_index = 0; | |
3105 | stripe_nr++; | |
3106 | } | |
3107 | } | |
3108 | } else { | |
3109 | for (i = 0; i < num_stripes; i++) { | |
212a17ab LT |
3110 | multi->stripes[i].physical = |
3111 | map->stripes[stripe_index].physical + | |
3112 | stripe_offset + | |
3113 | stripe_nr * map->stripe_len; | |
3114 | multi->stripes[i].dev = | |
3115 | map->stripes[stripe_index].dev; | |
fce3bb9a | 3116 | stripe_index++; |
f2d8d74d | 3117 | } |
593060d7 | 3118 | } |
f2d8d74d CM |
3119 | if (multi_ret) { |
3120 | *multi_ret = multi; | |
3121 | multi->num_stripes = num_stripes; | |
a236aed1 | 3122 | multi->max_errors = max_errors; |
f2d8d74d | 3123 | } |
cea9e445 | 3124 | out: |
0b86a832 | 3125 | free_extent_map(em); |
0b86a832 CM |
3126 | return 0; |
3127 | } | |
3128 | ||
f2d8d74d CM |
3129 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
3130 | u64 logical, u64 *length, | |
3131 | struct btrfs_multi_bio **multi_ret, int mirror_num) | |
3132 | { | |
3133 | return __btrfs_map_block(map_tree, rw, logical, length, multi_ret, | |
7eaceacc | 3134 | mirror_num); |
f2d8d74d CM |
3135 | } |
3136 | ||
a512bbf8 YZ |
3137 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
3138 | u64 chunk_start, u64 physical, u64 devid, | |
3139 | u64 **logical, int *naddrs, int *stripe_len) | |
3140 | { | |
3141 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
3142 | struct extent_map *em; | |
3143 | struct map_lookup *map; | |
3144 | u64 *buf; | |
3145 | u64 bytenr; | |
3146 | u64 length; | |
3147 | u64 stripe_nr; | |
3148 | int i, j, nr = 0; | |
3149 | ||
890871be | 3150 | read_lock(&em_tree->lock); |
a512bbf8 | 3151 | em = lookup_extent_mapping(em_tree, chunk_start, 1); |
890871be | 3152 | read_unlock(&em_tree->lock); |
a512bbf8 YZ |
3153 | |
3154 | BUG_ON(!em || em->start != chunk_start); | |
3155 | map = (struct map_lookup *)em->bdev; | |
3156 | ||
3157 | length = em->len; | |
3158 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) | |
3159 | do_div(length, map->num_stripes / map->sub_stripes); | |
3160 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
3161 | do_div(length, map->num_stripes); | |
3162 | ||
3163 | buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); | |
3164 | BUG_ON(!buf); | |
3165 | ||
3166 | for (i = 0; i < map->num_stripes; i++) { | |
3167 | if (devid && map->stripes[i].dev->devid != devid) | |
3168 | continue; | |
3169 | if (map->stripes[i].physical > physical || | |
3170 | map->stripes[i].physical + length <= physical) | |
3171 | continue; | |
3172 | ||
3173 | stripe_nr = physical - map->stripes[i].physical; | |
3174 | do_div(stripe_nr, map->stripe_len); | |
3175 | ||
3176 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
3177 | stripe_nr = stripe_nr * map->num_stripes + i; | |
3178 | do_div(stripe_nr, map->sub_stripes); | |
3179 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3180 | stripe_nr = stripe_nr * map->num_stripes + i; | |
3181 | } | |
3182 | bytenr = chunk_start + stripe_nr * map->stripe_len; | |
934d375b | 3183 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
3184 | for (j = 0; j < nr; j++) { |
3185 | if (buf[j] == bytenr) | |
3186 | break; | |
3187 | } | |
934d375b CM |
3188 | if (j == nr) { |
3189 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 3190 | buf[nr++] = bytenr; |
934d375b | 3191 | } |
a512bbf8 YZ |
3192 | } |
3193 | ||
a512bbf8 YZ |
3194 | *logical = buf; |
3195 | *naddrs = nr; | |
3196 | *stripe_len = map->stripe_len; | |
3197 | ||
3198 | free_extent_map(em); | |
3199 | return 0; | |
f2d8d74d CM |
3200 | } |
3201 | ||
8790d502 | 3202 | static void end_bio_multi_stripe(struct bio *bio, int err) |
8790d502 | 3203 | { |
cea9e445 | 3204 | struct btrfs_multi_bio *multi = bio->bi_private; |
7d2b4daa | 3205 | int is_orig_bio = 0; |
8790d502 | 3206 | |
8790d502 | 3207 | if (err) |
a236aed1 | 3208 | atomic_inc(&multi->error); |
8790d502 | 3209 | |
7d2b4daa CM |
3210 | if (bio == multi->orig_bio) |
3211 | is_orig_bio = 1; | |
3212 | ||
cea9e445 | 3213 | if (atomic_dec_and_test(&multi->stripes_pending)) { |
7d2b4daa CM |
3214 | if (!is_orig_bio) { |
3215 | bio_put(bio); | |
3216 | bio = multi->orig_bio; | |
3217 | } | |
8790d502 CM |
3218 | bio->bi_private = multi->private; |
3219 | bio->bi_end_io = multi->end_io; | |
a236aed1 CM |
3220 | /* only send an error to the higher layers if it is |
3221 | * beyond the tolerance of the multi-bio | |
3222 | */ | |
1259ab75 | 3223 | if (atomic_read(&multi->error) > multi->max_errors) { |
a236aed1 | 3224 | err = -EIO; |
1259ab75 CM |
3225 | } else if (err) { |
3226 | /* | |
3227 | * this bio is actually up to date, we didn't | |
3228 | * go over the max number of errors | |
3229 | */ | |
3230 | set_bit(BIO_UPTODATE, &bio->bi_flags); | |
a236aed1 | 3231 | err = 0; |
1259ab75 | 3232 | } |
8790d502 CM |
3233 | kfree(multi); |
3234 | ||
3235 | bio_endio(bio, err); | |
7d2b4daa | 3236 | } else if (!is_orig_bio) { |
8790d502 CM |
3237 | bio_put(bio); |
3238 | } | |
8790d502 CM |
3239 | } |
3240 | ||
8b712842 CM |
3241 | struct async_sched { |
3242 | struct bio *bio; | |
3243 | int rw; | |
3244 | struct btrfs_fs_info *info; | |
3245 | struct btrfs_work work; | |
3246 | }; | |
3247 | ||
3248 | /* | |
3249 | * see run_scheduled_bios for a description of why bios are collected for | |
3250 | * async submit. | |
3251 | * | |
3252 | * This will add one bio to the pending list for a device and make sure | |
3253 | * the work struct is scheduled. | |
3254 | */ | |
d397712b | 3255 | static noinline int schedule_bio(struct btrfs_root *root, |
a1b32a59 CM |
3256 | struct btrfs_device *device, |
3257 | int rw, struct bio *bio) | |
8b712842 CM |
3258 | { |
3259 | int should_queue = 1; | |
ffbd517d | 3260 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
3261 | |
3262 | /* don't bother with additional async steps for reads, right now */ | |
7b6d91da | 3263 | if (!(rw & REQ_WRITE)) { |
492bb6de | 3264 | bio_get(bio); |
8b712842 | 3265 | submit_bio(rw, bio); |
492bb6de | 3266 | bio_put(bio); |
8b712842 CM |
3267 | return 0; |
3268 | } | |
3269 | ||
3270 | /* | |
0986fe9e | 3271 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
3272 | * higher layers. Otherwise, the async bio makes it appear we have |
3273 | * made progress against dirty pages when we've really just put it | |
3274 | * on a queue for later | |
3275 | */ | |
0986fe9e | 3276 | atomic_inc(&root->fs_info->nr_async_bios); |
492bb6de | 3277 | WARN_ON(bio->bi_next); |
8b712842 CM |
3278 | bio->bi_next = NULL; |
3279 | bio->bi_rw |= rw; | |
3280 | ||
3281 | spin_lock(&device->io_lock); | |
7b6d91da | 3282 | if (bio->bi_rw & REQ_SYNC) |
ffbd517d CM |
3283 | pending_bios = &device->pending_sync_bios; |
3284 | else | |
3285 | pending_bios = &device->pending_bios; | |
8b712842 | 3286 | |
ffbd517d CM |
3287 | if (pending_bios->tail) |
3288 | pending_bios->tail->bi_next = bio; | |
8b712842 | 3289 | |
ffbd517d CM |
3290 | pending_bios->tail = bio; |
3291 | if (!pending_bios->head) | |
3292 | pending_bios->head = bio; | |
8b712842 CM |
3293 | if (device->running_pending) |
3294 | should_queue = 0; | |
3295 | ||
3296 | spin_unlock(&device->io_lock); | |
3297 | ||
3298 | if (should_queue) | |
1cc127b5 CM |
3299 | btrfs_queue_worker(&root->fs_info->submit_workers, |
3300 | &device->work); | |
8b712842 CM |
3301 | return 0; |
3302 | } | |
3303 | ||
f188591e | 3304 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 3305 | int mirror_num, int async_submit) |
0b86a832 CM |
3306 | { |
3307 | struct btrfs_mapping_tree *map_tree; | |
3308 | struct btrfs_device *dev; | |
8790d502 | 3309 | struct bio *first_bio = bio; |
a62b9401 | 3310 | u64 logical = (u64)bio->bi_sector << 9; |
0b86a832 CM |
3311 | u64 length = 0; |
3312 | u64 map_length; | |
cea9e445 | 3313 | struct btrfs_multi_bio *multi = NULL; |
0b86a832 | 3314 | int ret; |
8790d502 CM |
3315 | int dev_nr = 0; |
3316 | int total_devs = 1; | |
0b86a832 | 3317 | |
f2d8d74d | 3318 | length = bio->bi_size; |
0b86a832 CM |
3319 | map_tree = &root->fs_info->mapping_tree; |
3320 | map_length = length; | |
cea9e445 | 3321 | |
f188591e CM |
3322 | ret = btrfs_map_block(map_tree, rw, logical, &map_length, &multi, |
3323 | mirror_num); | |
cea9e445 CM |
3324 | BUG_ON(ret); |
3325 | ||
3326 | total_devs = multi->num_stripes; | |
3327 | if (map_length < length) { | |
d397712b CM |
3328 | printk(KERN_CRIT "mapping failed logical %llu bio len %llu " |
3329 | "len %llu\n", (unsigned long long)logical, | |
3330 | (unsigned long long)length, | |
3331 | (unsigned long long)map_length); | |
cea9e445 CM |
3332 | BUG(); |
3333 | } | |
3334 | multi->end_io = first_bio->bi_end_io; | |
3335 | multi->private = first_bio->bi_private; | |
7d2b4daa | 3336 | multi->orig_bio = first_bio; |
cea9e445 CM |
3337 | atomic_set(&multi->stripes_pending, multi->num_stripes); |
3338 | ||
d397712b | 3339 | while (dev_nr < total_devs) { |
8790d502 | 3340 | if (total_devs > 1) { |
8790d502 CM |
3341 | if (dev_nr < total_devs - 1) { |
3342 | bio = bio_clone(first_bio, GFP_NOFS); | |
3343 | BUG_ON(!bio); | |
3344 | } else { | |
3345 | bio = first_bio; | |
3346 | } | |
3347 | bio->bi_private = multi; | |
3348 | bio->bi_end_io = end_bio_multi_stripe; | |
3349 | } | |
cea9e445 CM |
3350 | bio->bi_sector = multi->stripes[dev_nr].physical >> 9; |
3351 | dev = multi->stripes[dev_nr].dev; | |
18e503d6 | 3352 | if (dev && dev->bdev && (rw != WRITE || dev->writeable)) { |
dfe25020 | 3353 | bio->bi_bdev = dev->bdev; |
8b712842 CM |
3354 | if (async_submit) |
3355 | schedule_bio(root, dev, rw, bio); | |
3356 | else | |
3357 | submit_bio(rw, bio); | |
dfe25020 CM |
3358 | } else { |
3359 | bio->bi_bdev = root->fs_info->fs_devices->latest_bdev; | |
3360 | bio->bi_sector = logical >> 9; | |
dfe25020 | 3361 | bio_endio(bio, -EIO); |
dfe25020 | 3362 | } |
8790d502 CM |
3363 | dev_nr++; |
3364 | } | |
cea9e445 CM |
3365 | if (total_devs == 1) |
3366 | kfree(multi); | |
0b86a832 CM |
3367 | return 0; |
3368 | } | |
3369 | ||
a443755f | 3370 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, |
2b82032c | 3371 | u8 *uuid, u8 *fsid) |
0b86a832 | 3372 | { |
2b82032c YZ |
3373 | struct btrfs_device *device; |
3374 | struct btrfs_fs_devices *cur_devices; | |
3375 | ||
3376 | cur_devices = root->fs_info->fs_devices; | |
3377 | while (cur_devices) { | |
3378 | if (!fsid || | |
3379 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
3380 | device = __find_device(&cur_devices->devices, | |
3381 | devid, uuid); | |
3382 | if (device) | |
3383 | return device; | |
3384 | } | |
3385 | cur_devices = cur_devices->seed; | |
3386 | } | |
3387 | return NULL; | |
0b86a832 CM |
3388 | } |
3389 | ||
dfe25020 CM |
3390 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
3391 | u64 devid, u8 *dev_uuid) | |
3392 | { | |
3393 | struct btrfs_device *device; | |
3394 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
3395 | ||
3396 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
7cbd8a83 | 3397 | if (!device) |
3398 | return NULL; | |
dfe25020 CM |
3399 | list_add(&device->dev_list, |
3400 | &fs_devices->devices); | |
dfe25020 CM |
3401 | device->dev_root = root->fs_info->dev_root; |
3402 | device->devid = devid; | |
8b712842 | 3403 | device->work.func = pending_bios_fn; |
e4404d6e | 3404 | device->fs_devices = fs_devices; |
cd02dca5 | 3405 | device->missing = 1; |
dfe25020 | 3406 | fs_devices->num_devices++; |
cd02dca5 | 3407 | fs_devices->missing_devices++; |
dfe25020 | 3408 | spin_lock_init(&device->io_lock); |
d20f7043 | 3409 | INIT_LIST_HEAD(&device->dev_alloc_list); |
dfe25020 CM |
3410 | memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE); |
3411 | return device; | |
3412 | } | |
3413 | ||
0b86a832 CM |
3414 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
3415 | struct extent_buffer *leaf, | |
3416 | struct btrfs_chunk *chunk) | |
3417 | { | |
3418 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
3419 | struct map_lookup *map; | |
3420 | struct extent_map *em; | |
3421 | u64 logical; | |
3422 | u64 length; | |
3423 | u64 devid; | |
a443755f | 3424 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 3425 | int num_stripes; |
0b86a832 | 3426 | int ret; |
593060d7 | 3427 | int i; |
0b86a832 | 3428 | |
e17cade2 CM |
3429 | logical = key->offset; |
3430 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 3431 | |
890871be | 3432 | read_lock(&map_tree->map_tree.lock); |
0b86a832 | 3433 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
890871be | 3434 | read_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
3435 | |
3436 | /* already mapped? */ | |
3437 | if (em && em->start <= logical && em->start + em->len > logical) { | |
3438 | free_extent_map(em); | |
0b86a832 CM |
3439 | return 0; |
3440 | } else if (em) { | |
3441 | free_extent_map(em); | |
3442 | } | |
0b86a832 | 3443 | |
172ddd60 | 3444 | em = alloc_extent_map(); |
0b86a832 CM |
3445 | if (!em) |
3446 | return -ENOMEM; | |
593060d7 CM |
3447 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
3448 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
3449 | if (!map) { |
3450 | free_extent_map(em); | |
3451 | return -ENOMEM; | |
3452 | } | |
3453 | ||
3454 | em->bdev = (struct block_device *)map; | |
3455 | em->start = logical; | |
3456 | em->len = length; | |
3457 | em->block_start = 0; | |
c8b97818 | 3458 | em->block_len = em->len; |
0b86a832 | 3459 | |
593060d7 CM |
3460 | map->num_stripes = num_stripes; |
3461 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
3462 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
3463 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
3464 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
3465 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 3466 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
3467 | for (i = 0; i < num_stripes; i++) { |
3468 | map->stripes[i].physical = | |
3469 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
3470 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
3471 | read_extent_buffer(leaf, uuid, (unsigned long) |
3472 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
3473 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
3474 | map->stripes[i].dev = btrfs_find_device(root, devid, uuid, |
3475 | NULL); | |
dfe25020 | 3476 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
593060d7 CM |
3477 | kfree(map); |
3478 | free_extent_map(em); | |
3479 | return -EIO; | |
3480 | } | |
dfe25020 CM |
3481 | if (!map->stripes[i].dev) { |
3482 | map->stripes[i].dev = | |
3483 | add_missing_dev(root, devid, uuid); | |
3484 | if (!map->stripes[i].dev) { | |
3485 | kfree(map); | |
3486 | free_extent_map(em); | |
3487 | return -EIO; | |
3488 | } | |
3489 | } | |
3490 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
3491 | } |
3492 | ||
890871be | 3493 | write_lock(&map_tree->map_tree.lock); |
0b86a832 | 3494 | ret = add_extent_mapping(&map_tree->map_tree, em); |
890871be | 3495 | write_unlock(&map_tree->map_tree.lock); |
b248a415 | 3496 | BUG_ON(ret); |
0b86a832 CM |
3497 | free_extent_map(em); |
3498 | ||
3499 | return 0; | |
3500 | } | |
3501 | ||
3502 | static int fill_device_from_item(struct extent_buffer *leaf, | |
3503 | struct btrfs_dev_item *dev_item, | |
3504 | struct btrfs_device *device) | |
3505 | { | |
3506 | unsigned long ptr; | |
0b86a832 CM |
3507 | |
3508 | device->devid = btrfs_device_id(leaf, dev_item); | |
d6397bae CB |
3509 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
3510 | device->total_bytes = device->disk_total_bytes; | |
0b86a832 CM |
3511 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
3512 | device->type = btrfs_device_type(leaf, dev_item); | |
3513 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
3514 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
3515 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
0b86a832 CM |
3516 | |
3517 | ptr = (unsigned long)btrfs_device_uuid(dev_item); | |
e17cade2 | 3518 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 3519 | |
0b86a832 CM |
3520 | return 0; |
3521 | } | |
3522 | ||
2b82032c YZ |
3523 | static int open_seed_devices(struct btrfs_root *root, u8 *fsid) |
3524 | { | |
3525 | struct btrfs_fs_devices *fs_devices; | |
3526 | int ret; | |
3527 | ||
3528 | mutex_lock(&uuid_mutex); | |
3529 | ||
3530 | fs_devices = root->fs_info->fs_devices->seed; | |
3531 | while (fs_devices) { | |
3532 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
3533 | ret = 0; | |
3534 | goto out; | |
3535 | } | |
3536 | fs_devices = fs_devices->seed; | |
3537 | } | |
3538 | ||
3539 | fs_devices = find_fsid(fsid); | |
3540 | if (!fs_devices) { | |
3541 | ret = -ENOENT; | |
3542 | goto out; | |
3543 | } | |
e4404d6e YZ |
3544 | |
3545 | fs_devices = clone_fs_devices(fs_devices); | |
3546 | if (IS_ERR(fs_devices)) { | |
3547 | ret = PTR_ERR(fs_devices); | |
2b82032c YZ |
3548 | goto out; |
3549 | } | |
3550 | ||
97288f2c | 3551 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
15916de8 | 3552 | root->fs_info->bdev_holder); |
2b82032c YZ |
3553 | if (ret) |
3554 | goto out; | |
3555 | ||
3556 | if (!fs_devices->seeding) { | |
3557 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 3558 | free_fs_devices(fs_devices); |
2b82032c YZ |
3559 | ret = -EINVAL; |
3560 | goto out; | |
3561 | } | |
3562 | ||
3563 | fs_devices->seed = root->fs_info->fs_devices->seed; | |
3564 | root->fs_info->fs_devices->seed = fs_devices; | |
2b82032c YZ |
3565 | out: |
3566 | mutex_unlock(&uuid_mutex); | |
3567 | return ret; | |
3568 | } | |
3569 | ||
0d81ba5d | 3570 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
3571 | struct extent_buffer *leaf, |
3572 | struct btrfs_dev_item *dev_item) | |
3573 | { | |
3574 | struct btrfs_device *device; | |
3575 | u64 devid; | |
3576 | int ret; | |
2b82032c | 3577 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
3578 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
3579 | ||
0b86a832 | 3580 | devid = btrfs_device_id(leaf, dev_item); |
a443755f CM |
3581 | read_extent_buffer(leaf, dev_uuid, |
3582 | (unsigned long)btrfs_device_uuid(dev_item), | |
3583 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
3584 | read_extent_buffer(leaf, fs_uuid, |
3585 | (unsigned long)btrfs_device_fsid(dev_item), | |
3586 | BTRFS_UUID_SIZE); | |
3587 | ||
3588 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { | |
3589 | ret = open_seed_devices(root, fs_uuid); | |
e4404d6e | 3590 | if (ret && !btrfs_test_opt(root, DEGRADED)) |
2b82032c | 3591 | return ret; |
2b82032c YZ |
3592 | } |
3593 | ||
3594 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
3595 | if (!device || !device->bdev) { | |
e4404d6e | 3596 | if (!btrfs_test_opt(root, DEGRADED)) |
2b82032c YZ |
3597 | return -EIO; |
3598 | ||
3599 | if (!device) { | |
d397712b CM |
3600 | printk(KERN_WARNING "warning devid %llu missing\n", |
3601 | (unsigned long long)devid); | |
2b82032c YZ |
3602 | device = add_missing_dev(root, devid, dev_uuid); |
3603 | if (!device) | |
3604 | return -ENOMEM; | |
cd02dca5 CM |
3605 | } else if (!device->missing) { |
3606 | /* | |
3607 | * this happens when a device that was properly setup | |
3608 | * in the device info lists suddenly goes bad. | |
3609 | * device->bdev is NULL, and so we have to set | |
3610 | * device->missing to one here | |
3611 | */ | |
3612 | root->fs_info->fs_devices->missing_devices++; | |
3613 | device->missing = 1; | |
2b82032c YZ |
3614 | } |
3615 | } | |
3616 | ||
3617 | if (device->fs_devices != root->fs_info->fs_devices) { | |
3618 | BUG_ON(device->writeable); | |
3619 | if (device->generation != | |
3620 | btrfs_device_generation(leaf, dev_item)) | |
3621 | return -EINVAL; | |
6324fbf3 | 3622 | } |
0b86a832 CM |
3623 | |
3624 | fill_device_from_item(leaf, dev_item, device); | |
3625 | device->dev_root = root->fs_info->dev_root; | |
dfe25020 | 3626 | device->in_fs_metadata = 1; |
2b82032c YZ |
3627 | if (device->writeable) |
3628 | device->fs_devices->total_rw_bytes += device->total_bytes; | |
0b86a832 | 3629 | ret = 0; |
0b86a832 CM |
3630 | return ret; |
3631 | } | |
3632 | ||
e4404d6e | 3633 | int btrfs_read_sys_array(struct btrfs_root *root) |
0b86a832 CM |
3634 | { |
3635 | struct btrfs_super_block *super_copy = &root->fs_info->super_copy; | |
a061fc8d | 3636 | struct extent_buffer *sb; |
0b86a832 | 3637 | struct btrfs_disk_key *disk_key; |
0b86a832 | 3638 | struct btrfs_chunk *chunk; |
84eed90f CM |
3639 | u8 *ptr; |
3640 | unsigned long sb_ptr; | |
3641 | int ret = 0; | |
0b86a832 CM |
3642 | u32 num_stripes; |
3643 | u32 array_size; | |
3644 | u32 len = 0; | |
0b86a832 | 3645 | u32 cur; |
84eed90f | 3646 | struct btrfs_key key; |
0b86a832 | 3647 | |
e4404d6e | 3648 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET, |
a061fc8d CM |
3649 | BTRFS_SUPER_INFO_SIZE); |
3650 | if (!sb) | |
3651 | return -ENOMEM; | |
3652 | btrfs_set_buffer_uptodate(sb); | |
85d4e461 | 3653 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0); |
4008c04a | 3654 | |
a061fc8d | 3655 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
3656 | array_size = btrfs_super_sys_array_size(super_copy); |
3657 | ||
0b86a832 CM |
3658 | ptr = super_copy->sys_chunk_array; |
3659 | sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array); | |
3660 | cur = 0; | |
3661 | ||
3662 | while (cur < array_size) { | |
3663 | disk_key = (struct btrfs_disk_key *)ptr; | |
3664 | btrfs_disk_key_to_cpu(&key, disk_key); | |
3665 | ||
a061fc8d | 3666 | len = sizeof(*disk_key); ptr += len; |
0b86a832 CM |
3667 | sb_ptr += len; |
3668 | cur += len; | |
3669 | ||
0d81ba5d | 3670 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
0b86a832 | 3671 | chunk = (struct btrfs_chunk *)sb_ptr; |
0d81ba5d | 3672 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
3673 | if (ret) |
3674 | break; | |
0b86a832 CM |
3675 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); |
3676 | len = btrfs_chunk_item_size(num_stripes); | |
3677 | } else { | |
84eed90f CM |
3678 | ret = -EIO; |
3679 | break; | |
0b86a832 CM |
3680 | } |
3681 | ptr += len; | |
3682 | sb_ptr += len; | |
3683 | cur += len; | |
3684 | } | |
a061fc8d | 3685 | free_extent_buffer(sb); |
84eed90f | 3686 | return ret; |
0b86a832 CM |
3687 | } |
3688 | ||
3689 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
3690 | { | |
3691 | struct btrfs_path *path; | |
3692 | struct extent_buffer *leaf; | |
3693 | struct btrfs_key key; | |
3694 | struct btrfs_key found_key; | |
3695 | int ret; | |
3696 | int slot; | |
3697 | ||
3698 | root = root->fs_info->chunk_root; | |
3699 | ||
3700 | path = btrfs_alloc_path(); | |
3701 | if (!path) | |
3702 | return -ENOMEM; | |
3703 | ||
3704 | /* first we search for all of the device items, and then we | |
3705 | * read in all of the chunk items. This way we can create chunk | |
3706 | * mappings that reference all of the devices that are afound | |
3707 | */ | |
3708 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
3709 | key.offset = 0; | |
3710 | key.type = 0; | |
3711 | again: | |
3712 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
ab59381e ZL |
3713 | if (ret < 0) |
3714 | goto error; | |
d397712b | 3715 | while (1) { |
0b86a832 CM |
3716 | leaf = path->nodes[0]; |
3717 | slot = path->slots[0]; | |
3718 | if (slot >= btrfs_header_nritems(leaf)) { | |
3719 | ret = btrfs_next_leaf(root, path); | |
3720 | if (ret == 0) | |
3721 | continue; | |
3722 | if (ret < 0) | |
3723 | goto error; | |
3724 | break; | |
3725 | } | |
3726 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
3727 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3728 | if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID) | |
3729 | break; | |
3730 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { | |
3731 | struct btrfs_dev_item *dev_item; | |
3732 | dev_item = btrfs_item_ptr(leaf, slot, | |
3733 | struct btrfs_dev_item); | |
0d81ba5d | 3734 | ret = read_one_dev(root, leaf, dev_item); |
2b82032c YZ |
3735 | if (ret) |
3736 | goto error; | |
0b86a832 CM |
3737 | } |
3738 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { | |
3739 | struct btrfs_chunk *chunk; | |
3740 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
3741 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2b82032c YZ |
3742 | if (ret) |
3743 | goto error; | |
0b86a832 CM |
3744 | } |
3745 | path->slots[0]++; | |
3746 | } | |
3747 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
3748 | key.objectid = 0; | |
b3b4aa74 | 3749 | btrfs_release_path(path); |
0b86a832 CM |
3750 | goto again; |
3751 | } | |
0b86a832 CM |
3752 | ret = 0; |
3753 | error: | |
2b82032c | 3754 | btrfs_free_path(path); |
0b86a832 CM |
3755 | return ret; |
3756 | } |