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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> |
442a4f63 | 26 | #include <linux/ratelimit.h> |
59641015 | 27 | #include <linux/kthread.h> |
53b381b3 | 28 | #include <linux/raid/pq.h> |
803b2f54 | 29 | #include <linux/semaphore.h> |
53b381b3 | 30 | #include <asm/div64.h> |
0b86a832 CM |
31 | #include "ctree.h" |
32 | #include "extent_map.h" | |
33 | #include "disk-io.h" | |
34 | #include "transaction.h" | |
35 | #include "print-tree.h" | |
36 | #include "volumes.h" | |
53b381b3 | 37 | #include "raid56.h" |
8b712842 | 38 | #include "async-thread.h" |
21adbd5c | 39 | #include "check-integrity.h" |
606686ee | 40 | #include "rcu-string.h" |
3fed40cc | 41 | #include "math.h" |
8dabb742 | 42 | #include "dev-replace.h" |
99994cde | 43 | #include "sysfs.h" |
0b86a832 | 44 | |
af902047 ZL |
45 | const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = { |
46 | [BTRFS_RAID_RAID10] = { | |
47 | .sub_stripes = 2, | |
48 | .dev_stripes = 1, | |
49 | .devs_max = 0, /* 0 == as many as possible */ | |
50 | .devs_min = 4, | |
8789f4fe | 51 | .tolerated_failures = 1, |
af902047 ZL |
52 | .devs_increment = 2, |
53 | .ncopies = 2, | |
54 | }, | |
55 | [BTRFS_RAID_RAID1] = { | |
56 | .sub_stripes = 1, | |
57 | .dev_stripes = 1, | |
58 | .devs_max = 2, | |
59 | .devs_min = 2, | |
8789f4fe | 60 | .tolerated_failures = 1, |
af902047 ZL |
61 | .devs_increment = 2, |
62 | .ncopies = 2, | |
63 | }, | |
64 | [BTRFS_RAID_DUP] = { | |
65 | .sub_stripes = 1, | |
66 | .dev_stripes = 2, | |
67 | .devs_max = 1, | |
68 | .devs_min = 1, | |
8789f4fe | 69 | .tolerated_failures = 0, |
af902047 ZL |
70 | .devs_increment = 1, |
71 | .ncopies = 2, | |
72 | }, | |
73 | [BTRFS_RAID_RAID0] = { | |
74 | .sub_stripes = 1, | |
75 | .dev_stripes = 1, | |
76 | .devs_max = 0, | |
77 | .devs_min = 2, | |
8789f4fe | 78 | .tolerated_failures = 0, |
af902047 ZL |
79 | .devs_increment = 1, |
80 | .ncopies = 1, | |
81 | }, | |
82 | [BTRFS_RAID_SINGLE] = { | |
83 | .sub_stripes = 1, | |
84 | .dev_stripes = 1, | |
85 | .devs_max = 1, | |
86 | .devs_min = 1, | |
8789f4fe | 87 | .tolerated_failures = 0, |
af902047 ZL |
88 | .devs_increment = 1, |
89 | .ncopies = 1, | |
90 | }, | |
91 | [BTRFS_RAID_RAID5] = { | |
92 | .sub_stripes = 1, | |
93 | .dev_stripes = 1, | |
94 | .devs_max = 0, | |
95 | .devs_min = 2, | |
8789f4fe | 96 | .tolerated_failures = 1, |
af902047 ZL |
97 | .devs_increment = 1, |
98 | .ncopies = 2, | |
99 | }, | |
100 | [BTRFS_RAID_RAID6] = { | |
101 | .sub_stripes = 1, | |
102 | .dev_stripes = 1, | |
103 | .devs_max = 0, | |
104 | .devs_min = 3, | |
8789f4fe | 105 | .tolerated_failures = 2, |
af902047 ZL |
106 | .devs_increment = 1, |
107 | .ncopies = 3, | |
108 | }, | |
109 | }; | |
110 | ||
111 | const u64 const btrfs_raid_group[BTRFS_NR_RAID_TYPES] = { | |
112 | [BTRFS_RAID_RAID10] = BTRFS_BLOCK_GROUP_RAID10, | |
113 | [BTRFS_RAID_RAID1] = BTRFS_BLOCK_GROUP_RAID1, | |
114 | [BTRFS_RAID_DUP] = BTRFS_BLOCK_GROUP_DUP, | |
115 | [BTRFS_RAID_RAID0] = BTRFS_BLOCK_GROUP_RAID0, | |
116 | [BTRFS_RAID_SINGLE] = 0, | |
117 | [BTRFS_RAID_RAID5] = BTRFS_BLOCK_GROUP_RAID5, | |
118 | [BTRFS_RAID_RAID6] = BTRFS_BLOCK_GROUP_RAID6, | |
119 | }; | |
120 | ||
2b82032c YZ |
121 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
122 | struct btrfs_root *root, | |
123 | struct btrfs_device *device); | |
124 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); | |
733f4fbb | 125 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev); |
48a3b636 | 126 | static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev); |
733f4fbb | 127 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *device); |
2b82032c | 128 | |
67a2c45e | 129 | DEFINE_MUTEX(uuid_mutex); |
8a4b83cc | 130 | static LIST_HEAD(fs_uuids); |
c73eccf7 AJ |
131 | struct list_head *btrfs_get_fs_uuids(void) |
132 | { | |
133 | return &fs_uuids; | |
134 | } | |
8a4b83cc | 135 | |
2208a378 ID |
136 | static struct btrfs_fs_devices *__alloc_fs_devices(void) |
137 | { | |
138 | struct btrfs_fs_devices *fs_devs; | |
139 | ||
140 | fs_devs = kzalloc(sizeof(*fs_devs), GFP_NOFS); | |
141 | if (!fs_devs) | |
142 | return ERR_PTR(-ENOMEM); | |
143 | ||
144 | mutex_init(&fs_devs->device_list_mutex); | |
145 | ||
146 | INIT_LIST_HEAD(&fs_devs->devices); | |
935e5cc9 | 147 | INIT_LIST_HEAD(&fs_devs->resized_devices); |
2208a378 ID |
148 | INIT_LIST_HEAD(&fs_devs->alloc_list); |
149 | INIT_LIST_HEAD(&fs_devs->list); | |
150 | ||
151 | return fs_devs; | |
152 | } | |
153 | ||
154 | /** | |
155 | * alloc_fs_devices - allocate struct btrfs_fs_devices | |
156 | * @fsid: a pointer to UUID for this FS. If NULL a new UUID is | |
157 | * generated. | |
158 | * | |
159 | * Return: a pointer to a new &struct btrfs_fs_devices on success; | |
160 | * ERR_PTR() on error. Returned struct is not linked onto any lists and | |
161 | * can be destroyed with kfree() right away. | |
162 | */ | |
163 | static struct btrfs_fs_devices *alloc_fs_devices(const u8 *fsid) | |
164 | { | |
165 | struct btrfs_fs_devices *fs_devs; | |
166 | ||
167 | fs_devs = __alloc_fs_devices(); | |
168 | if (IS_ERR(fs_devs)) | |
169 | return fs_devs; | |
170 | ||
171 | if (fsid) | |
172 | memcpy(fs_devs->fsid, fsid, BTRFS_FSID_SIZE); | |
173 | else | |
174 | generate_random_uuid(fs_devs->fsid); | |
175 | ||
176 | return fs_devs; | |
177 | } | |
178 | ||
e4404d6e YZ |
179 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
180 | { | |
181 | struct btrfs_device *device; | |
182 | WARN_ON(fs_devices->opened); | |
183 | while (!list_empty(&fs_devices->devices)) { | |
184 | device = list_entry(fs_devices->devices.next, | |
185 | struct btrfs_device, dev_list); | |
186 | list_del(&device->dev_list); | |
606686ee | 187 | rcu_string_free(device->name); |
e4404d6e YZ |
188 | kfree(device); |
189 | } | |
190 | kfree(fs_devices); | |
191 | } | |
192 | ||
b8b8ff59 LC |
193 | static void btrfs_kobject_uevent(struct block_device *bdev, |
194 | enum kobject_action action) | |
195 | { | |
196 | int ret; | |
197 | ||
198 | ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); | |
199 | if (ret) | |
efe120a0 | 200 | pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", |
b8b8ff59 LC |
201 | action, |
202 | kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), | |
203 | &disk_to_dev(bdev->bd_disk)->kobj); | |
204 | } | |
205 | ||
143bede5 | 206 | void btrfs_cleanup_fs_uuids(void) |
8a4b83cc CM |
207 | { |
208 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 209 | |
2b82032c YZ |
210 | while (!list_empty(&fs_uuids)) { |
211 | fs_devices = list_entry(fs_uuids.next, | |
212 | struct btrfs_fs_devices, list); | |
213 | list_del(&fs_devices->list); | |
e4404d6e | 214 | free_fs_devices(fs_devices); |
8a4b83cc | 215 | } |
8a4b83cc CM |
216 | } |
217 | ||
12bd2fc0 ID |
218 | static struct btrfs_device *__alloc_device(void) |
219 | { | |
220 | struct btrfs_device *dev; | |
221 | ||
222 | dev = kzalloc(sizeof(*dev), GFP_NOFS); | |
223 | if (!dev) | |
224 | return ERR_PTR(-ENOMEM); | |
225 | ||
226 | INIT_LIST_HEAD(&dev->dev_list); | |
227 | INIT_LIST_HEAD(&dev->dev_alloc_list); | |
935e5cc9 | 228 | INIT_LIST_HEAD(&dev->resized_list); |
12bd2fc0 ID |
229 | |
230 | spin_lock_init(&dev->io_lock); | |
231 | ||
232 | spin_lock_init(&dev->reada_lock); | |
233 | atomic_set(&dev->reada_in_flight, 0); | |
addc3fa7 | 234 | atomic_set(&dev->dev_stats_ccnt, 0); |
12bd2fc0 ID |
235 | INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_WAIT); |
236 | INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_WAIT); | |
237 | ||
238 | return dev; | |
239 | } | |
240 | ||
a1b32a59 CM |
241 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
242 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
243 | { |
244 | struct btrfs_device *dev; | |
8a4b83cc | 245 | |
c6e30871 | 246 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 247 | if (dev->devid == devid && |
8f18cf13 | 248 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 249 | return dev; |
a443755f | 250 | } |
8a4b83cc CM |
251 | } |
252 | return NULL; | |
253 | } | |
254 | ||
a1b32a59 | 255 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 256 | { |
8a4b83cc CM |
257 | struct btrfs_fs_devices *fs_devices; |
258 | ||
c6e30871 | 259 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
260 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
261 | return fs_devices; | |
262 | } | |
263 | return NULL; | |
264 | } | |
265 | ||
beaf8ab3 SB |
266 | static int |
267 | btrfs_get_bdev_and_sb(const char *device_path, fmode_t flags, void *holder, | |
268 | int flush, struct block_device **bdev, | |
269 | struct buffer_head **bh) | |
270 | { | |
271 | int ret; | |
272 | ||
273 | *bdev = blkdev_get_by_path(device_path, flags, holder); | |
274 | ||
275 | if (IS_ERR(*bdev)) { | |
276 | ret = PTR_ERR(*bdev); | |
beaf8ab3 SB |
277 | goto error; |
278 | } | |
279 | ||
280 | if (flush) | |
281 | filemap_write_and_wait((*bdev)->bd_inode->i_mapping); | |
282 | ret = set_blocksize(*bdev, 4096); | |
283 | if (ret) { | |
284 | blkdev_put(*bdev, flags); | |
285 | goto error; | |
286 | } | |
287 | invalidate_bdev(*bdev); | |
288 | *bh = btrfs_read_dev_super(*bdev); | |
92fc03fb AJ |
289 | if (IS_ERR(*bh)) { |
290 | ret = PTR_ERR(*bh); | |
beaf8ab3 SB |
291 | blkdev_put(*bdev, flags); |
292 | goto error; | |
293 | } | |
294 | ||
295 | return 0; | |
296 | ||
297 | error: | |
298 | *bdev = NULL; | |
299 | *bh = NULL; | |
300 | return ret; | |
301 | } | |
302 | ||
ffbd517d CM |
303 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
304 | struct bio *head, struct bio *tail) | |
305 | { | |
306 | ||
307 | struct bio *old_head; | |
308 | ||
309 | old_head = pending_bios->head; | |
310 | pending_bios->head = head; | |
311 | if (pending_bios->tail) | |
312 | tail->bi_next = old_head; | |
313 | else | |
314 | pending_bios->tail = tail; | |
315 | } | |
316 | ||
8b712842 CM |
317 | /* |
318 | * we try to collect pending bios for a device so we don't get a large | |
319 | * number of procs sending bios down to the same device. This greatly | |
320 | * improves the schedulers ability to collect and merge the bios. | |
321 | * | |
322 | * But, it also turns into a long list of bios to process and that is sure | |
323 | * to eventually make the worker thread block. The solution here is to | |
324 | * make some progress and then put this work struct back at the end of | |
325 | * the list if the block device is congested. This way, multiple devices | |
326 | * can make progress from a single worker thread. | |
327 | */ | |
143bede5 | 328 | static noinline void run_scheduled_bios(struct btrfs_device *device) |
8b712842 CM |
329 | { |
330 | struct bio *pending; | |
331 | struct backing_dev_info *bdi; | |
b64a2851 | 332 | struct btrfs_fs_info *fs_info; |
ffbd517d | 333 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
334 | struct bio *tail; |
335 | struct bio *cur; | |
336 | int again = 0; | |
ffbd517d | 337 | unsigned long num_run; |
d644d8a1 | 338 | unsigned long batch_run = 0; |
b64a2851 | 339 | unsigned long limit; |
b765ead5 | 340 | unsigned long last_waited = 0; |
d84275c9 | 341 | int force_reg = 0; |
0e588859 | 342 | int sync_pending = 0; |
211588ad CM |
343 | struct blk_plug plug; |
344 | ||
345 | /* | |
346 | * this function runs all the bios we've collected for | |
347 | * a particular device. We don't want to wander off to | |
348 | * another device without first sending all of these down. | |
349 | * So, setup a plug here and finish it off before we return | |
350 | */ | |
351 | blk_start_plug(&plug); | |
8b712842 | 352 | |
bedf762b | 353 | bdi = blk_get_backing_dev_info(device->bdev); |
b64a2851 CM |
354 | fs_info = device->dev_root->fs_info; |
355 | limit = btrfs_async_submit_limit(fs_info); | |
356 | limit = limit * 2 / 3; | |
357 | ||
8b712842 CM |
358 | loop: |
359 | spin_lock(&device->io_lock); | |
360 | ||
a6837051 | 361 | loop_lock: |
d84275c9 | 362 | num_run = 0; |
ffbd517d | 363 | |
8b712842 CM |
364 | /* take all the bios off the list at once and process them |
365 | * later on (without the lock held). But, remember the | |
366 | * tail and other pointers so the bios can be properly reinserted | |
367 | * into the list if we hit congestion | |
368 | */ | |
d84275c9 | 369 | if (!force_reg && device->pending_sync_bios.head) { |
ffbd517d | 370 | pending_bios = &device->pending_sync_bios; |
d84275c9 CM |
371 | force_reg = 1; |
372 | } else { | |
ffbd517d | 373 | pending_bios = &device->pending_bios; |
d84275c9 CM |
374 | force_reg = 0; |
375 | } | |
ffbd517d CM |
376 | |
377 | pending = pending_bios->head; | |
378 | tail = pending_bios->tail; | |
8b712842 | 379 | WARN_ON(pending && !tail); |
8b712842 CM |
380 | |
381 | /* | |
382 | * if pending was null this time around, no bios need processing | |
383 | * at all and we can stop. Otherwise it'll loop back up again | |
384 | * and do an additional check so no bios are missed. | |
385 | * | |
386 | * device->running_pending is used to synchronize with the | |
387 | * schedule_bio code. | |
388 | */ | |
ffbd517d CM |
389 | if (device->pending_sync_bios.head == NULL && |
390 | device->pending_bios.head == NULL) { | |
8b712842 CM |
391 | again = 0; |
392 | device->running_pending = 0; | |
ffbd517d CM |
393 | } else { |
394 | again = 1; | |
395 | device->running_pending = 1; | |
8b712842 | 396 | } |
ffbd517d CM |
397 | |
398 | pending_bios->head = NULL; | |
399 | pending_bios->tail = NULL; | |
400 | ||
8b712842 CM |
401 | spin_unlock(&device->io_lock); |
402 | ||
d397712b | 403 | while (pending) { |
ffbd517d CM |
404 | |
405 | rmb(); | |
d84275c9 CM |
406 | /* we want to work on both lists, but do more bios on the |
407 | * sync list than the regular list | |
408 | */ | |
409 | if ((num_run > 32 && | |
410 | pending_bios != &device->pending_sync_bios && | |
411 | device->pending_sync_bios.head) || | |
412 | (num_run > 64 && pending_bios == &device->pending_sync_bios && | |
413 | device->pending_bios.head)) { | |
ffbd517d CM |
414 | spin_lock(&device->io_lock); |
415 | requeue_list(pending_bios, pending, tail); | |
416 | goto loop_lock; | |
417 | } | |
418 | ||
8b712842 CM |
419 | cur = pending; |
420 | pending = pending->bi_next; | |
421 | cur->bi_next = NULL; | |
b64a2851 | 422 | |
ee863954 DS |
423 | /* |
424 | * atomic_dec_return implies a barrier for waitqueue_active | |
425 | */ | |
66657b31 | 426 | if (atomic_dec_return(&fs_info->nr_async_bios) < limit && |
b64a2851 CM |
427 | waitqueue_active(&fs_info->async_submit_wait)) |
428 | wake_up(&fs_info->async_submit_wait); | |
492bb6de | 429 | |
dac56212 | 430 | BUG_ON(atomic_read(&cur->__bi_cnt) == 0); |
d644d8a1 | 431 | |
2ab1ba68 CM |
432 | /* |
433 | * if we're doing the sync list, record that our | |
434 | * plug has some sync requests on it | |
435 | * | |
436 | * If we're doing the regular list and there are | |
437 | * sync requests sitting around, unplug before | |
438 | * we add more | |
439 | */ | |
440 | if (pending_bios == &device->pending_sync_bios) { | |
441 | sync_pending = 1; | |
442 | } else if (sync_pending) { | |
443 | blk_finish_plug(&plug); | |
444 | blk_start_plug(&plug); | |
445 | sync_pending = 0; | |
446 | } | |
447 | ||
21adbd5c | 448 | btrfsic_submit_bio(cur->bi_rw, cur); |
5ff7ba3a CM |
449 | num_run++; |
450 | batch_run++; | |
853d8ec4 DS |
451 | |
452 | cond_resched(); | |
8b712842 CM |
453 | |
454 | /* | |
455 | * we made progress, there is more work to do and the bdi | |
456 | * is now congested. Back off and let other work structs | |
457 | * run instead | |
458 | */ | |
57fd5a5f | 459 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
5f2cc086 | 460 | fs_info->fs_devices->open_devices > 1) { |
b765ead5 | 461 | struct io_context *ioc; |
8b712842 | 462 | |
b765ead5 CM |
463 | ioc = current->io_context; |
464 | ||
465 | /* | |
466 | * the main goal here is that we don't want to | |
467 | * block if we're going to be able to submit | |
468 | * more requests without blocking. | |
469 | * | |
470 | * This code does two great things, it pokes into | |
471 | * the elevator code from a filesystem _and_ | |
472 | * it makes assumptions about how batching works. | |
473 | */ | |
474 | if (ioc && ioc->nr_batch_requests > 0 && | |
475 | time_before(jiffies, ioc->last_waited + HZ/50UL) && | |
476 | (last_waited == 0 || | |
477 | ioc->last_waited == last_waited)) { | |
478 | /* | |
479 | * we want to go through our batch of | |
480 | * requests and stop. So, we copy out | |
481 | * the ioc->last_waited time and test | |
482 | * against it before looping | |
483 | */ | |
484 | last_waited = ioc->last_waited; | |
853d8ec4 | 485 | cond_resched(); |
b765ead5 CM |
486 | continue; |
487 | } | |
8b712842 | 488 | spin_lock(&device->io_lock); |
ffbd517d | 489 | requeue_list(pending_bios, pending, tail); |
a6837051 | 490 | device->running_pending = 1; |
8b712842 CM |
491 | |
492 | spin_unlock(&device->io_lock); | |
a8c93d4e QW |
493 | btrfs_queue_work(fs_info->submit_workers, |
494 | &device->work); | |
8b712842 CM |
495 | goto done; |
496 | } | |
d85c8a6f CM |
497 | /* unplug every 64 requests just for good measure */ |
498 | if (batch_run % 64 == 0) { | |
499 | blk_finish_plug(&plug); | |
500 | blk_start_plug(&plug); | |
501 | sync_pending = 0; | |
502 | } | |
8b712842 | 503 | } |
ffbd517d | 504 | |
51684082 CM |
505 | cond_resched(); |
506 | if (again) | |
507 | goto loop; | |
508 | ||
509 | spin_lock(&device->io_lock); | |
510 | if (device->pending_bios.head || device->pending_sync_bios.head) | |
511 | goto loop_lock; | |
512 | spin_unlock(&device->io_lock); | |
513 | ||
8b712842 | 514 | done: |
211588ad | 515 | blk_finish_plug(&plug); |
8b712842 CM |
516 | } |
517 | ||
b2950863 | 518 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
519 | { |
520 | struct btrfs_device *device; | |
521 | ||
522 | device = container_of(work, struct btrfs_device, work); | |
523 | run_scheduled_bios(device); | |
524 | } | |
525 | ||
4fde46f0 AJ |
526 | |
527 | void btrfs_free_stale_device(struct btrfs_device *cur_dev) | |
528 | { | |
529 | struct btrfs_fs_devices *fs_devs; | |
530 | struct btrfs_device *dev; | |
531 | ||
532 | if (!cur_dev->name) | |
533 | return; | |
534 | ||
535 | list_for_each_entry(fs_devs, &fs_uuids, list) { | |
536 | int del = 1; | |
537 | ||
538 | if (fs_devs->opened) | |
539 | continue; | |
540 | if (fs_devs->seeding) | |
541 | continue; | |
542 | ||
543 | list_for_each_entry(dev, &fs_devs->devices, dev_list) { | |
544 | ||
545 | if (dev == cur_dev) | |
546 | continue; | |
547 | if (!dev->name) | |
548 | continue; | |
549 | ||
550 | /* | |
551 | * Todo: This won't be enough. What if the same device | |
552 | * comes back (with new uuid and) with its mapper path? | |
553 | * But for now, this does help as mostly an admin will | |
554 | * either use mapper or non mapper path throughout. | |
555 | */ | |
556 | rcu_read_lock(); | |
557 | del = strcmp(rcu_str_deref(dev->name), | |
558 | rcu_str_deref(cur_dev->name)); | |
559 | rcu_read_unlock(); | |
560 | if (!del) | |
561 | break; | |
562 | } | |
563 | ||
564 | if (!del) { | |
565 | /* delete the stale device */ | |
566 | if (fs_devs->num_devices == 1) { | |
567 | btrfs_sysfs_remove_fsid(fs_devs); | |
568 | list_del(&fs_devs->list); | |
569 | free_fs_devices(fs_devs); | |
570 | } else { | |
571 | fs_devs->num_devices--; | |
572 | list_del(&dev->dev_list); | |
573 | rcu_string_free(dev->name); | |
574 | kfree(dev); | |
575 | } | |
576 | break; | |
577 | } | |
578 | } | |
579 | } | |
580 | ||
60999ca4 DS |
581 | /* |
582 | * Add new device to list of registered devices | |
583 | * | |
584 | * Returns: | |
585 | * 1 - first time device is seen | |
586 | * 0 - device already known | |
587 | * < 0 - error | |
588 | */ | |
a1b32a59 | 589 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
590 | struct btrfs_super_block *disk_super, |
591 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
592 | { | |
593 | struct btrfs_device *device; | |
594 | struct btrfs_fs_devices *fs_devices; | |
606686ee | 595 | struct rcu_string *name; |
60999ca4 | 596 | int ret = 0; |
8a4b83cc CM |
597 | u64 found_transid = btrfs_super_generation(disk_super); |
598 | ||
599 | fs_devices = find_fsid(disk_super->fsid); | |
600 | if (!fs_devices) { | |
2208a378 ID |
601 | fs_devices = alloc_fs_devices(disk_super->fsid); |
602 | if (IS_ERR(fs_devices)) | |
603 | return PTR_ERR(fs_devices); | |
604 | ||
8a4b83cc | 605 | list_add(&fs_devices->list, &fs_uuids); |
2208a378 | 606 | |
8a4b83cc CM |
607 | device = NULL; |
608 | } else { | |
a443755f CM |
609 | device = __find_device(&fs_devices->devices, devid, |
610 | disk_super->dev_item.uuid); | |
8a4b83cc | 611 | } |
443f24fe | 612 | |
8a4b83cc | 613 | if (!device) { |
2b82032c YZ |
614 | if (fs_devices->opened) |
615 | return -EBUSY; | |
616 | ||
12bd2fc0 ID |
617 | device = btrfs_alloc_device(NULL, &devid, |
618 | disk_super->dev_item.uuid); | |
619 | if (IS_ERR(device)) { | |
8a4b83cc | 620 | /* we can safely leave the fs_devices entry around */ |
12bd2fc0 | 621 | return PTR_ERR(device); |
8a4b83cc | 622 | } |
606686ee JB |
623 | |
624 | name = rcu_string_strdup(path, GFP_NOFS); | |
625 | if (!name) { | |
8a4b83cc CM |
626 | kfree(device); |
627 | return -ENOMEM; | |
628 | } | |
606686ee | 629 | rcu_assign_pointer(device->name, name); |
90519d66 | 630 | |
e5e9a520 | 631 | mutex_lock(&fs_devices->device_list_mutex); |
1f78160c | 632 | list_add_rcu(&device->dev_list, &fs_devices->devices); |
f7171750 | 633 | fs_devices->num_devices++; |
e5e9a520 CM |
634 | mutex_unlock(&fs_devices->device_list_mutex); |
635 | ||
60999ca4 | 636 | ret = 1; |
2b82032c | 637 | device->fs_devices = fs_devices; |
606686ee | 638 | } else if (!device->name || strcmp(device->name->str, path)) { |
b96de000 AJ |
639 | /* |
640 | * When FS is already mounted. | |
641 | * 1. If you are here and if the device->name is NULL that | |
642 | * means this device was missing at time of FS mount. | |
643 | * 2. If you are here and if the device->name is different | |
644 | * from 'path' that means either | |
645 | * a. The same device disappeared and reappeared with | |
646 | * different name. or | |
647 | * b. The missing-disk-which-was-replaced, has | |
648 | * reappeared now. | |
649 | * | |
650 | * We must allow 1 and 2a above. But 2b would be a spurious | |
651 | * and unintentional. | |
652 | * | |
653 | * Further in case of 1 and 2a above, the disk at 'path' | |
654 | * would have missed some transaction when it was away and | |
655 | * in case of 2a the stale bdev has to be updated as well. | |
656 | * 2b must not be allowed at all time. | |
657 | */ | |
658 | ||
659 | /* | |
0f23ae74 CM |
660 | * For now, we do allow update to btrfs_fs_device through the |
661 | * btrfs dev scan cli after FS has been mounted. We're still | |
662 | * tracking a problem where systems fail mount by subvolume id | |
663 | * when we reject replacement on a mounted FS. | |
b96de000 | 664 | */ |
0f23ae74 | 665 | if (!fs_devices->opened && found_transid < device->generation) { |
77bdae4d AJ |
666 | /* |
667 | * That is if the FS is _not_ mounted and if you | |
668 | * are here, that means there is more than one | |
669 | * disk with same uuid and devid.We keep the one | |
670 | * with larger generation number or the last-in if | |
671 | * generation are equal. | |
672 | */ | |
0f23ae74 | 673 | return -EEXIST; |
77bdae4d | 674 | } |
b96de000 | 675 | |
606686ee | 676 | name = rcu_string_strdup(path, GFP_NOFS); |
3a0524dc TH |
677 | if (!name) |
678 | return -ENOMEM; | |
606686ee JB |
679 | rcu_string_free(device->name); |
680 | rcu_assign_pointer(device->name, name); | |
cd02dca5 CM |
681 | if (device->missing) { |
682 | fs_devices->missing_devices--; | |
683 | device->missing = 0; | |
684 | } | |
8a4b83cc CM |
685 | } |
686 | ||
77bdae4d AJ |
687 | /* |
688 | * Unmount does not free the btrfs_device struct but would zero | |
689 | * generation along with most of the other members. So just update | |
690 | * it back. We need it to pick the disk with largest generation | |
691 | * (as above). | |
692 | */ | |
693 | if (!fs_devices->opened) | |
694 | device->generation = found_transid; | |
695 | ||
4fde46f0 AJ |
696 | /* |
697 | * if there is new btrfs on an already registered device, | |
698 | * then remove the stale device entry. | |
699 | */ | |
700 | btrfs_free_stale_device(device); | |
701 | ||
8a4b83cc | 702 | *fs_devices_ret = fs_devices; |
60999ca4 DS |
703 | |
704 | return ret; | |
8a4b83cc CM |
705 | } |
706 | ||
e4404d6e YZ |
707 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
708 | { | |
709 | struct btrfs_fs_devices *fs_devices; | |
710 | struct btrfs_device *device; | |
711 | struct btrfs_device *orig_dev; | |
712 | ||
2208a378 ID |
713 | fs_devices = alloc_fs_devices(orig->fsid); |
714 | if (IS_ERR(fs_devices)) | |
715 | return fs_devices; | |
e4404d6e | 716 | |
adbbb863 | 717 | mutex_lock(&orig->device_list_mutex); |
02db0844 | 718 | fs_devices->total_devices = orig->total_devices; |
e4404d6e | 719 | |
46224705 | 720 | /* We have held the volume lock, it is safe to get the devices. */ |
e4404d6e | 721 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
606686ee JB |
722 | struct rcu_string *name; |
723 | ||
12bd2fc0 ID |
724 | device = btrfs_alloc_device(NULL, &orig_dev->devid, |
725 | orig_dev->uuid); | |
726 | if (IS_ERR(device)) | |
e4404d6e YZ |
727 | goto error; |
728 | ||
606686ee JB |
729 | /* |
730 | * This is ok to do without rcu read locked because we hold the | |
731 | * uuid mutex so nothing we touch in here is going to disappear. | |
732 | */ | |
e755f780 AJ |
733 | if (orig_dev->name) { |
734 | name = rcu_string_strdup(orig_dev->name->str, GFP_NOFS); | |
735 | if (!name) { | |
736 | kfree(device); | |
737 | goto error; | |
738 | } | |
739 | rcu_assign_pointer(device->name, name); | |
fd2696f3 | 740 | } |
e4404d6e | 741 | |
e4404d6e YZ |
742 | list_add(&device->dev_list, &fs_devices->devices); |
743 | device->fs_devices = fs_devices; | |
744 | fs_devices->num_devices++; | |
745 | } | |
adbbb863 | 746 | mutex_unlock(&orig->device_list_mutex); |
e4404d6e YZ |
747 | return fs_devices; |
748 | error: | |
adbbb863 | 749 | mutex_unlock(&orig->device_list_mutex); |
e4404d6e YZ |
750 | free_fs_devices(fs_devices); |
751 | return ERR_PTR(-ENOMEM); | |
752 | } | |
753 | ||
9eaed21e | 754 | void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices, int step) |
dfe25020 | 755 | { |
c6e30871 | 756 | struct btrfs_device *device, *next; |
443f24fe | 757 | struct btrfs_device *latest_dev = NULL; |
a6b0d5c8 | 758 | |
dfe25020 CM |
759 | mutex_lock(&uuid_mutex); |
760 | again: | |
46224705 | 761 | /* This is the initialized path, it is safe to release the devices. */ |
c6e30871 | 762 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
a6b0d5c8 | 763 | if (device->in_fs_metadata) { |
63a212ab | 764 | if (!device->is_tgtdev_for_dev_replace && |
443f24fe MX |
765 | (!latest_dev || |
766 | device->generation > latest_dev->generation)) { | |
767 | latest_dev = device; | |
a6b0d5c8 | 768 | } |
2b82032c | 769 | continue; |
a6b0d5c8 | 770 | } |
2b82032c | 771 | |
8dabb742 SB |
772 | if (device->devid == BTRFS_DEV_REPLACE_DEVID) { |
773 | /* | |
774 | * In the first step, keep the device which has | |
775 | * the correct fsid and the devid that is used | |
776 | * for the dev_replace procedure. | |
777 | * In the second step, the dev_replace state is | |
778 | * read from the device tree and it is known | |
779 | * whether the procedure is really active or | |
780 | * not, which means whether this device is | |
781 | * used or whether it should be removed. | |
782 | */ | |
783 | if (step == 0 || device->is_tgtdev_for_dev_replace) { | |
784 | continue; | |
785 | } | |
786 | } | |
2b82032c | 787 | if (device->bdev) { |
d4d77629 | 788 | blkdev_put(device->bdev, device->mode); |
2b82032c YZ |
789 | device->bdev = NULL; |
790 | fs_devices->open_devices--; | |
791 | } | |
792 | if (device->writeable) { | |
793 | list_del_init(&device->dev_alloc_list); | |
794 | device->writeable = 0; | |
8dabb742 SB |
795 | if (!device->is_tgtdev_for_dev_replace) |
796 | fs_devices->rw_devices--; | |
2b82032c | 797 | } |
e4404d6e YZ |
798 | list_del_init(&device->dev_list); |
799 | fs_devices->num_devices--; | |
606686ee | 800 | rcu_string_free(device->name); |
e4404d6e | 801 | kfree(device); |
dfe25020 | 802 | } |
2b82032c YZ |
803 | |
804 | if (fs_devices->seed) { | |
805 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
806 | goto again; |
807 | } | |
808 | ||
443f24fe | 809 | fs_devices->latest_bdev = latest_dev->bdev; |
a6b0d5c8 | 810 | |
dfe25020 | 811 | mutex_unlock(&uuid_mutex); |
dfe25020 | 812 | } |
a0af469b | 813 | |
1f78160c XG |
814 | static void __free_device(struct work_struct *work) |
815 | { | |
816 | struct btrfs_device *device; | |
817 | ||
818 | device = container_of(work, struct btrfs_device, rcu_work); | |
819 | ||
820 | if (device->bdev) | |
821 | blkdev_put(device->bdev, device->mode); | |
822 | ||
606686ee | 823 | rcu_string_free(device->name); |
1f78160c XG |
824 | kfree(device); |
825 | } | |
826 | ||
827 | static void free_device(struct rcu_head *head) | |
828 | { | |
829 | struct btrfs_device *device; | |
830 | ||
831 | device = container_of(head, struct btrfs_device, rcu); | |
832 | ||
833 | INIT_WORK(&device->rcu_work, __free_device); | |
834 | schedule_work(&device->rcu_work); | |
835 | } | |
836 | ||
2b82032c | 837 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 838 | { |
2037a093 | 839 | struct btrfs_device *device, *tmp; |
e4404d6e | 840 | |
2b82032c YZ |
841 | if (--fs_devices->opened > 0) |
842 | return 0; | |
8a4b83cc | 843 | |
c9513edb | 844 | mutex_lock(&fs_devices->device_list_mutex); |
2037a093 | 845 | list_for_each_entry_safe(device, tmp, &fs_devices->devices, dev_list) { |
f190aa47 | 846 | btrfs_close_one_device(device); |
8a4b83cc | 847 | } |
c9513edb XG |
848 | mutex_unlock(&fs_devices->device_list_mutex); |
849 | ||
e4404d6e YZ |
850 | WARN_ON(fs_devices->open_devices); |
851 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
852 | fs_devices->opened = 0; |
853 | fs_devices->seeding = 0; | |
2b82032c | 854 | |
8a4b83cc CM |
855 | return 0; |
856 | } | |
857 | ||
2b82032c YZ |
858 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
859 | { | |
e4404d6e | 860 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
861 | int ret; |
862 | ||
863 | mutex_lock(&uuid_mutex); | |
864 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
865 | if (!fs_devices->opened) { |
866 | seed_devices = fs_devices->seed; | |
867 | fs_devices->seed = NULL; | |
868 | } | |
2b82032c | 869 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
870 | |
871 | while (seed_devices) { | |
872 | fs_devices = seed_devices; | |
873 | seed_devices = fs_devices->seed; | |
874 | __btrfs_close_devices(fs_devices); | |
875 | free_fs_devices(fs_devices); | |
876 | } | |
bc178622 ES |
877 | /* |
878 | * Wait for rcu kworkers under __btrfs_close_devices | |
879 | * to finish all blkdev_puts so device is really | |
880 | * free when umount is done. | |
881 | */ | |
882 | rcu_barrier(); | |
2b82032c YZ |
883 | return ret; |
884 | } | |
885 | ||
e4404d6e YZ |
886 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
887 | fmode_t flags, void *holder) | |
8a4b83cc | 888 | { |
d5e2003c | 889 | struct request_queue *q; |
8a4b83cc CM |
890 | struct block_device *bdev; |
891 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 892 | struct btrfs_device *device; |
443f24fe | 893 | struct btrfs_device *latest_dev = NULL; |
a0af469b CM |
894 | struct buffer_head *bh; |
895 | struct btrfs_super_block *disk_super; | |
a0af469b | 896 | u64 devid; |
2b82032c | 897 | int seeding = 1; |
a0af469b | 898 | int ret = 0; |
8a4b83cc | 899 | |
d4d77629 TH |
900 | flags |= FMODE_EXCL; |
901 | ||
c6e30871 | 902 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
903 | if (device->bdev) |
904 | continue; | |
dfe25020 CM |
905 | if (!device->name) |
906 | continue; | |
907 | ||
f63e0cca ES |
908 | /* Just open everything we can; ignore failures here */ |
909 | if (btrfs_get_bdev_and_sb(device->name->str, flags, holder, 1, | |
910 | &bdev, &bh)) | |
beaf8ab3 | 911 | continue; |
a0af469b CM |
912 | |
913 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 914 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
a0af469b CM |
915 | if (devid != device->devid) |
916 | goto error_brelse; | |
917 | ||
2b82032c YZ |
918 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
919 | BTRFS_UUID_SIZE)) | |
920 | goto error_brelse; | |
921 | ||
922 | device->generation = btrfs_super_generation(disk_super); | |
443f24fe MX |
923 | if (!latest_dev || |
924 | device->generation > latest_dev->generation) | |
925 | latest_dev = device; | |
a0af469b | 926 | |
2b82032c YZ |
927 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
928 | device->writeable = 0; | |
929 | } else { | |
930 | device->writeable = !bdev_read_only(bdev); | |
931 | seeding = 0; | |
932 | } | |
933 | ||
d5e2003c | 934 | q = bdev_get_queue(bdev); |
90180da4 | 935 | if (blk_queue_discard(q)) |
d5e2003c | 936 | device->can_discard = 1; |
d5e2003c | 937 | |
8a4b83cc | 938 | device->bdev = bdev; |
dfe25020 | 939 | device->in_fs_metadata = 0; |
15916de8 CM |
940 | device->mode = flags; |
941 | ||
c289811c CM |
942 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
943 | fs_devices->rotating = 1; | |
944 | ||
a0af469b | 945 | fs_devices->open_devices++; |
55e50e45 ID |
946 | if (device->writeable && |
947 | device->devid != BTRFS_DEV_REPLACE_DEVID) { | |
2b82032c YZ |
948 | fs_devices->rw_devices++; |
949 | list_add(&device->dev_alloc_list, | |
950 | &fs_devices->alloc_list); | |
951 | } | |
4f6c9328 | 952 | brelse(bh); |
a0af469b | 953 | continue; |
a061fc8d | 954 | |
a0af469b CM |
955 | error_brelse: |
956 | brelse(bh); | |
d4d77629 | 957 | blkdev_put(bdev, flags); |
a0af469b | 958 | continue; |
8a4b83cc | 959 | } |
a0af469b | 960 | if (fs_devices->open_devices == 0) { |
20bcd649 | 961 | ret = -EINVAL; |
a0af469b CM |
962 | goto out; |
963 | } | |
2b82032c YZ |
964 | fs_devices->seeding = seeding; |
965 | fs_devices->opened = 1; | |
443f24fe | 966 | fs_devices->latest_bdev = latest_dev->bdev; |
2b82032c | 967 | fs_devices->total_rw_bytes = 0; |
a0af469b | 968 | out: |
2b82032c YZ |
969 | return ret; |
970 | } | |
971 | ||
972 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 973 | fmode_t flags, void *holder) |
2b82032c YZ |
974 | { |
975 | int ret; | |
976 | ||
977 | mutex_lock(&uuid_mutex); | |
978 | if (fs_devices->opened) { | |
e4404d6e YZ |
979 | fs_devices->opened++; |
980 | ret = 0; | |
2b82032c | 981 | } else { |
15916de8 | 982 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 983 | } |
8a4b83cc | 984 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
985 | return ret; |
986 | } | |
987 | ||
6f60cbd3 DS |
988 | /* |
989 | * Look for a btrfs signature on a device. This may be called out of the mount path | |
990 | * and we are not allowed to call set_blocksize during the scan. The superblock | |
991 | * is read via pagecache | |
992 | */ | |
97288f2c | 993 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
994 | struct btrfs_fs_devices **fs_devices_ret) |
995 | { | |
996 | struct btrfs_super_block *disk_super; | |
997 | struct block_device *bdev; | |
6f60cbd3 DS |
998 | struct page *page; |
999 | void *p; | |
1000 | int ret = -EINVAL; | |
8a4b83cc | 1001 | u64 devid; |
f2984462 | 1002 | u64 transid; |
02db0844 | 1003 | u64 total_devices; |
6f60cbd3 DS |
1004 | u64 bytenr; |
1005 | pgoff_t index; | |
8a4b83cc | 1006 | |
6f60cbd3 DS |
1007 | /* |
1008 | * we would like to check all the supers, but that would make | |
1009 | * a btrfs mount succeed after a mkfs from a different FS. | |
1010 | * So, we need to add a special mount option to scan for | |
1011 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead | |
1012 | */ | |
1013 | bytenr = btrfs_sb_offset(0); | |
d4d77629 | 1014 | flags |= FMODE_EXCL; |
10f6327b | 1015 | mutex_lock(&uuid_mutex); |
6f60cbd3 DS |
1016 | |
1017 | bdev = blkdev_get_by_path(path, flags, holder); | |
1018 | ||
1019 | if (IS_ERR(bdev)) { | |
1020 | ret = PTR_ERR(bdev); | |
beaf8ab3 | 1021 | goto error; |
6f60cbd3 DS |
1022 | } |
1023 | ||
1024 | /* make sure our super fits in the device */ | |
1025 | if (bytenr + PAGE_CACHE_SIZE >= i_size_read(bdev->bd_inode)) | |
1026 | goto error_bdev_put; | |
1027 | ||
1028 | /* make sure our super fits in the page */ | |
1029 | if (sizeof(*disk_super) > PAGE_CACHE_SIZE) | |
1030 | goto error_bdev_put; | |
1031 | ||
1032 | /* make sure our super doesn't straddle pages on disk */ | |
1033 | index = bytenr >> PAGE_CACHE_SHIFT; | |
1034 | if ((bytenr + sizeof(*disk_super) - 1) >> PAGE_CACHE_SHIFT != index) | |
1035 | goto error_bdev_put; | |
1036 | ||
1037 | /* pull in the page with our super */ | |
1038 | page = read_cache_page_gfp(bdev->bd_inode->i_mapping, | |
1039 | index, GFP_NOFS); | |
1040 | ||
1041 | if (IS_ERR_OR_NULL(page)) | |
1042 | goto error_bdev_put; | |
1043 | ||
1044 | p = kmap(page); | |
1045 | ||
1046 | /* align our pointer to the offset of the super block */ | |
1047 | disk_super = p + (bytenr & ~PAGE_CACHE_MASK); | |
1048 | ||
1049 | if (btrfs_super_bytenr(disk_super) != bytenr || | |
3cae210f | 1050 | btrfs_super_magic(disk_super) != BTRFS_MAGIC) |
6f60cbd3 DS |
1051 | goto error_unmap; |
1052 | ||
a343832f | 1053 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
f2984462 | 1054 | transid = btrfs_super_generation(disk_super); |
02db0844 | 1055 | total_devices = btrfs_super_num_devices(disk_super); |
6f60cbd3 | 1056 | |
8a4b83cc | 1057 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
60999ca4 DS |
1058 | if (ret > 0) { |
1059 | if (disk_super->label[0]) { | |
1060 | if (disk_super->label[BTRFS_LABEL_SIZE - 1]) | |
1061 | disk_super->label[BTRFS_LABEL_SIZE - 1] = '\0'; | |
1062 | printk(KERN_INFO "BTRFS: device label %s ", disk_super->label); | |
1063 | } else { | |
1064 | printk(KERN_INFO "BTRFS: device fsid %pU ", disk_super->fsid); | |
1065 | } | |
1066 | ||
1067 | printk(KERN_CONT "devid %llu transid %llu %s\n", devid, transid, path); | |
1068 | ret = 0; | |
1069 | } | |
02db0844 JB |
1070 | if (!ret && fs_devices_ret) |
1071 | (*fs_devices_ret)->total_devices = total_devices; | |
6f60cbd3 DS |
1072 | |
1073 | error_unmap: | |
1074 | kunmap(page); | |
1075 | page_cache_release(page); | |
1076 | ||
1077 | error_bdev_put: | |
d4d77629 | 1078 | blkdev_put(bdev, flags); |
8a4b83cc | 1079 | error: |
beaf8ab3 | 1080 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
1081 | return ret; |
1082 | } | |
0b86a832 | 1083 | |
6d07bcec MX |
1084 | /* helper to account the used device space in the range */ |
1085 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, | |
1086 | u64 end, u64 *length) | |
1087 | { | |
1088 | struct btrfs_key key; | |
1089 | struct btrfs_root *root = device->dev_root; | |
1090 | struct btrfs_dev_extent *dev_extent; | |
1091 | struct btrfs_path *path; | |
1092 | u64 extent_end; | |
1093 | int ret; | |
1094 | int slot; | |
1095 | struct extent_buffer *l; | |
1096 | ||
1097 | *length = 0; | |
1098 | ||
63a212ab | 1099 | if (start >= device->total_bytes || device->is_tgtdev_for_dev_replace) |
6d07bcec MX |
1100 | return 0; |
1101 | ||
1102 | path = btrfs_alloc_path(); | |
1103 | if (!path) | |
1104 | return -ENOMEM; | |
1105 | path->reada = 2; | |
1106 | ||
1107 | key.objectid = device->devid; | |
1108 | key.offset = start; | |
1109 | key.type = BTRFS_DEV_EXTENT_KEY; | |
1110 | ||
1111 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1112 | if (ret < 0) | |
1113 | goto out; | |
1114 | if (ret > 0) { | |
1115 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
1116 | if (ret < 0) | |
1117 | goto out; | |
1118 | } | |
1119 | ||
1120 | while (1) { | |
1121 | l = path->nodes[0]; | |
1122 | slot = path->slots[0]; | |
1123 | if (slot >= btrfs_header_nritems(l)) { | |
1124 | ret = btrfs_next_leaf(root, path); | |
1125 | if (ret == 0) | |
1126 | continue; | |
1127 | if (ret < 0) | |
1128 | goto out; | |
1129 | ||
1130 | break; | |
1131 | } | |
1132 | btrfs_item_key_to_cpu(l, &key, slot); | |
1133 | ||
1134 | if (key.objectid < device->devid) | |
1135 | goto next; | |
1136 | ||
1137 | if (key.objectid > device->devid) | |
1138 | break; | |
1139 | ||
962a298f | 1140 | if (key.type != BTRFS_DEV_EXTENT_KEY) |
6d07bcec MX |
1141 | goto next; |
1142 | ||
1143 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
1144 | extent_end = key.offset + btrfs_dev_extent_length(l, | |
1145 | dev_extent); | |
1146 | if (key.offset <= start && extent_end > end) { | |
1147 | *length = end - start + 1; | |
1148 | break; | |
1149 | } else if (key.offset <= start && extent_end > start) | |
1150 | *length += extent_end - start; | |
1151 | else if (key.offset > start && extent_end <= end) | |
1152 | *length += extent_end - key.offset; | |
1153 | else if (key.offset > start && key.offset <= end) { | |
1154 | *length += end - key.offset + 1; | |
1155 | break; | |
1156 | } else if (key.offset > end) | |
1157 | break; | |
1158 | ||
1159 | next: | |
1160 | path->slots[0]++; | |
1161 | } | |
1162 | ret = 0; | |
1163 | out: | |
1164 | btrfs_free_path(path); | |
1165 | return ret; | |
1166 | } | |
1167 | ||
499f377f | 1168 | static int contains_pending_extent(struct btrfs_transaction *transaction, |
6df9a95e JB |
1169 | struct btrfs_device *device, |
1170 | u64 *start, u64 len) | |
1171 | { | |
499f377f | 1172 | struct btrfs_fs_info *fs_info = device->dev_root->fs_info; |
6df9a95e | 1173 | struct extent_map *em; |
499f377f | 1174 | struct list_head *search_list = &fs_info->pinned_chunks; |
6df9a95e | 1175 | int ret = 0; |
1b984508 | 1176 | u64 physical_start = *start; |
6df9a95e | 1177 | |
499f377f JM |
1178 | if (transaction) |
1179 | search_list = &transaction->pending_chunks; | |
04216820 FM |
1180 | again: |
1181 | list_for_each_entry(em, search_list, list) { | |
6df9a95e JB |
1182 | struct map_lookup *map; |
1183 | int i; | |
1184 | ||
1185 | map = (struct map_lookup *)em->bdev; | |
1186 | for (i = 0; i < map->num_stripes; i++) { | |
c152b63e FM |
1187 | u64 end; |
1188 | ||
6df9a95e JB |
1189 | if (map->stripes[i].dev != device) |
1190 | continue; | |
1b984508 | 1191 | if (map->stripes[i].physical >= physical_start + len || |
6df9a95e | 1192 | map->stripes[i].physical + em->orig_block_len <= |
1b984508 | 1193 | physical_start) |
6df9a95e | 1194 | continue; |
c152b63e FM |
1195 | /* |
1196 | * Make sure that while processing the pinned list we do | |
1197 | * not override our *start with a lower value, because | |
1198 | * we can have pinned chunks that fall within this | |
1199 | * device hole and that have lower physical addresses | |
1200 | * than the pending chunks we processed before. If we | |
1201 | * do not take this special care we can end up getting | |
1202 | * 2 pending chunks that start at the same physical | |
1203 | * device offsets because the end offset of a pinned | |
1204 | * chunk can be equal to the start offset of some | |
1205 | * pending chunk. | |
1206 | */ | |
1207 | end = map->stripes[i].physical + em->orig_block_len; | |
1208 | if (end > *start) { | |
1209 | *start = end; | |
1210 | ret = 1; | |
1211 | } | |
6df9a95e JB |
1212 | } |
1213 | } | |
499f377f JM |
1214 | if (search_list != &fs_info->pinned_chunks) { |
1215 | search_list = &fs_info->pinned_chunks; | |
04216820 FM |
1216 | goto again; |
1217 | } | |
6df9a95e JB |
1218 | |
1219 | return ret; | |
1220 | } | |
1221 | ||
1222 | ||
0b86a832 | 1223 | /* |
499f377f JM |
1224 | * find_free_dev_extent_start - find free space in the specified device |
1225 | * @device: the device which we search the free space in | |
1226 | * @num_bytes: the size of the free space that we need | |
1227 | * @search_start: the position from which to begin the search | |
1228 | * @start: store the start of the free space. | |
1229 | * @len: the size of the free space. that we find, or the size | |
1230 | * of the max free space if we don't find suitable free space | |
7bfc837d | 1231 | * |
0b86a832 CM |
1232 | * this uses a pretty simple search, the expectation is that it is |
1233 | * called very infrequently and that a given device has a small number | |
1234 | * of extents | |
7bfc837d MX |
1235 | * |
1236 | * @start is used to store the start of the free space if we find. But if we | |
1237 | * don't find suitable free space, it will be used to store the start position | |
1238 | * of the max free space. | |
1239 | * | |
1240 | * @len is used to store the size of the free space that we find. | |
1241 | * But if we don't find suitable free space, it is used to store the size of | |
1242 | * the max free space. | |
0b86a832 | 1243 | */ |
499f377f JM |
1244 | int find_free_dev_extent_start(struct btrfs_transaction *transaction, |
1245 | struct btrfs_device *device, u64 num_bytes, | |
1246 | u64 search_start, u64 *start, u64 *len) | |
0b86a832 CM |
1247 | { |
1248 | struct btrfs_key key; | |
1249 | struct btrfs_root *root = device->dev_root; | |
7bfc837d | 1250 | struct btrfs_dev_extent *dev_extent; |
2b82032c | 1251 | struct btrfs_path *path; |
7bfc837d MX |
1252 | u64 hole_size; |
1253 | u64 max_hole_start; | |
1254 | u64 max_hole_size; | |
1255 | u64 extent_end; | |
0b86a832 CM |
1256 | u64 search_end = device->total_bytes; |
1257 | int ret; | |
7bfc837d | 1258 | int slot; |
0b86a832 CM |
1259 | struct extent_buffer *l; |
1260 | ||
6df9a95e JB |
1261 | path = btrfs_alloc_path(); |
1262 | if (!path) | |
1263 | return -ENOMEM; | |
f2ab7618 | 1264 | |
7bfc837d MX |
1265 | max_hole_start = search_start; |
1266 | max_hole_size = 0; | |
1267 | ||
f2ab7618 | 1268 | again: |
63a212ab | 1269 | if (search_start >= search_end || device->is_tgtdev_for_dev_replace) { |
7bfc837d | 1270 | ret = -ENOSPC; |
6df9a95e | 1271 | goto out; |
7bfc837d MX |
1272 | } |
1273 | ||
7bfc837d | 1274 | path->reada = 2; |
6df9a95e JB |
1275 | path->search_commit_root = 1; |
1276 | path->skip_locking = 1; | |
7bfc837d | 1277 | |
0b86a832 CM |
1278 | key.objectid = device->devid; |
1279 | key.offset = search_start; | |
1280 | key.type = BTRFS_DEV_EXTENT_KEY; | |
7bfc837d | 1281 | |
125ccb0a | 1282 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
0b86a832 | 1283 | if (ret < 0) |
7bfc837d | 1284 | goto out; |
1fcbac58 YZ |
1285 | if (ret > 0) { |
1286 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
1287 | if (ret < 0) | |
7bfc837d | 1288 | goto out; |
1fcbac58 | 1289 | } |
7bfc837d | 1290 | |
0b86a832 CM |
1291 | while (1) { |
1292 | l = path->nodes[0]; | |
1293 | slot = path->slots[0]; | |
1294 | if (slot >= btrfs_header_nritems(l)) { | |
1295 | ret = btrfs_next_leaf(root, path); | |
1296 | if (ret == 0) | |
1297 | continue; | |
1298 | if (ret < 0) | |
7bfc837d MX |
1299 | goto out; |
1300 | ||
1301 | break; | |
0b86a832 CM |
1302 | } |
1303 | btrfs_item_key_to_cpu(l, &key, slot); | |
1304 | ||
1305 | if (key.objectid < device->devid) | |
1306 | goto next; | |
1307 | ||
1308 | if (key.objectid > device->devid) | |
7bfc837d | 1309 | break; |
0b86a832 | 1310 | |
962a298f | 1311 | if (key.type != BTRFS_DEV_EXTENT_KEY) |
7bfc837d | 1312 | goto next; |
9779b72f | 1313 | |
7bfc837d MX |
1314 | if (key.offset > search_start) { |
1315 | hole_size = key.offset - search_start; | |
9779b72f | 1316 | |
6df9a95e JB |
1317 | /* |
1318 | * Have to check before we set max_hole_start, otherwise | |
1319 | * we could end up sending back this offset anyway. | |
1320 | */ | |
499f377f | 1321 | if (contains_pending_extent(transaction, device, |
6df9a95e | 1322 | &search_start, |
1b984508 FL |
1323 | hole_size)) { |
1324 | if (key.offset >= search_start) { | |
1325 | hole_size = key.offset - search_start; | |
1326 | } else { | |
1327 | WARN_ON_ONCE(1); | |
1328 | hole_size = 0; | |
1329 | } | |
1330 | } | |
6df9a95e | 1331 | |
7bfc837d MX |
1332 | if (hole_size > max_hole_size) { |
1333 | max_hole_start = search_start; | |
1334 | max_hole_size = hole_size; | |
1335 | } | |
9779b72f | 1336 | |
7bfc837d MX |
1337 | /* |
1338 | * If this free space is greater than which we need, | |
1339 | * it must be the max free space that we have found | |
1340 | * until now, so max_hole_start must point to the start | |
1341 | * of this free space and the length of this free space | |
1342 | * is stored in max_hole_size. Thus, we return | |
1343 | * max_hole_start and max_hole_size and go back to the | |
1344 | * caller. | |
1345 | */ | |
1346 | if (hole_size >= num_bytes) { | |
1347 | ret = 0; | |
1348 | goto out; | |
0b86a832 CM |
1349 | } |
1350 | } | |
0b86a832 | 1351 | |
0b86a832 | 1352 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
7bfc837d MX |
1353 | extent_end = key.offset + btrfs_dev_extent_length(l, |
1354 | dev_extent); | |
1355 | if (extent_end > search_start) | |
1356 | search_start = extent_end; | |
0b86a832 CM |
1357 | next: |
1358 | path->slots[0]++; | |
1359 | cond_resched(); | |
1360 | } | |
0b86a832 | 1361 | |
38c01b96 | 1362 | /* |
1363 | * At this point, search_start should be the end of | |
1364 | * allocated dev extents, and when shrinking the device, | |
1365 | * search_end may be smaller than search_start. | |
1366 | */ | |
f2ab7618 | 1367 | if (search_end > search_start) { |
38c01b96 | 1368 | hole_size = search_end - search_start; |
1369 | ||
499f377f | 1370 | if (contains_pending_extent(transaction, device, &search_start, |
f2ab7618 ZL |
1371 | hole_size)) { |
1372 | btrfs_release_path(path); | |
1373 | goto again; | |
1374 | } | |
0b86a832 | 1375 | |
f2ab7618 ZL |
1376 | if (hole_size > max_hole_size) { |
1377 | max_hole_start = search_start; | |
1378 | max_hole_size = hole_size; | |
1379 | } | |
6df9a95e JB |
1380 | } |
1381 | ||
7bfc837d | 1382 | /* See above. */ |
f2ab7618 | 1383 | if (max_hole_size < num_bytes) |
7bfc837d MX |
1384 | ret = -ENOSPC; |
1385 | else | |
1386 | ret = 0; | |
1387 | ||
1388 | out: | |
2b82032c | 1389 | btrfs_free_path(path); |
7bfc837d | 1390 | *start = max_hole_start; |
b2117a39 | 1391 | if (len) |
7bfc837d | 1392 | *len = max_hole_size; |
0b86a832 CM |
1393 | return ret; |
1394 | } | |
1395 | ||
499f377f JM |
1396 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
1397 | struct btrfs_device *device, u64 num_bytes, | |
1398 | u64 *start, u64 *len) | |
1399 | { | |
1400 | struct btrfs_root *root = device->dev_root; | |
1401 | u64 search_start; | |
1402 | ||
1403 | /* FIXME use last free of some kind */ | |
1404 | ||
1405 | /* | |
1406 | * we don't want to overwrite the superblock on the drive, | |
1407 | * so we make sure to start at an offset of at least 1MB | |
1408 | */ | |
1409 | search_start = max(root->fs_info->alloc_start, 1024ull * 1024); | |
1410 | return find_free_dev_extent_start(trans->transaction, device, | |
1411 | num_bytes, search_start, start, len); | |
1412 | } | |
1413 | ||
b2950863 | 1414 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 | 1415 | struct btrfs_device *device, |
2196d6e8 | 1416 | u64 start, u64 *dev_extent_len) |
8f18cf13 CM |
1417 | { |
1418 | int ret; | |
1419 | struct btrfs_path *path; | |
1420 | struct btrfs_root *root = device->dev_root; | |
1421 | struct btrfs_key key; | |
a061fc8d CM |
1422 | struct btrfs_key found_key; |
1423 | struct extent_buffer *leaf = NULL; | |
1424 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
1425 | |
1426 | path = btrfs_alloc_path(); | |
1427 | if (!path) | |
1428 | return -ENOMEM; | |
1429 | ||
1430 | key.objectid = device->devid; | |
1431 | key.offset = start; | |
1432 | key.type = BTRFS_DEV_EXTENT_KEY; | |
924cd8fb | 1433 | again: |
8f18cf13 | 1434 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
a061fc8d CM |
1435 | if (ret > 0) { |
1436 | ret = btrfs_previous_item(root, path, key.objectid, | |
1437 | BTRFS_DEV_EXTENT_KEY); | |
b0b802d7 TI |
1438 | if (ret) |
1439 | goto out; | |
a061fc8d CM |
1440 | leaf = path->nodes[0]; |
1441 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1442 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1443 | struct btrfs_dev_extent); | |
1444 | BUG_ON(found_key.offset > start || found_key.offset + | |
1445 | btrfs_dev_extent_length(leaf, extent) < start); | |
924cd8fb MX |
1446 | key = found_key; |
1447 | btrfs_release_path(path); | |
1448 | goto again; | |
a061fc8d CM |
1449 | } else if (ret == 0) { |
1450 | leaf = path->nodes[0]; | |
1451 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1452 | struct btrfs_dev_extent); | |
79787eaa | 1453 | } else { |
a4553fef | 1454 | btrfs_std_error(root->fs_info, ret, "Slot search failed"); |
79787eaa | 1455 | goto out; |
a061fc8d | 1456 | } |
8f18cf13 | 1457 | |
2196d6e8 MX |
1458 | *dev_extent_len = btrfs_dev_extent_length(leaf, extent); |
1459 | ||
8f18cf13 | 1460 | ret = btrfs_del_item(trans, root, path); |
79787eaa | 1461 | if (ret) { |
a4553fef | 1462 | btrfs_std_error(root->fs_info, ret, |
79787eaa | 1463 | "Failed to remove dev extent item"); |
13212b54 | 1464 | } else { |
3204d33c | 1465 | set_bit(BTRFS_TRANS_HAVE_FREE_BGS, &trans->transaction->flags); |
79787eaa | 1466 | } |
b0b802d7 | 1467 | out: |
8f18cf13 CM |
1468 | btrfs_free_path(path); |
1469 | return ret; | |
1470 | } | |
1471 | ||
48a3b636 ES |
1472 | static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
1473 | struct btrfs_device *device, | |
1474 | u64 chunk_tree, u64 chunk_objectid, | |
1475 | u64 chunk_offset, u64 start, u64 num_bytes) | |
0b86a832 CM |
1476 | { |
1477 | int ret; | |
1478 | struct btrfs_path *path; | |
1479 | struct btrfs_root *root = device->dev_root; | |
1480 | struct btrfs_dev_extent *extent; | |
1481 | struct extent_buffer *leaf; | |
1482 | struct btrfs_key key; | |
1483 | ||
dfe25020 | 1484 | WARN_ON(!device->in_fs_metadata); |
63a212ab | 1485 | WARN_ON(device->is_tgtdev_for_dev_replace); |
0b86a832 CM |
1486 | path = btrfs_alloc_path(); |
1487 | if (!path) | |
1488 | return -ENOMEM; | |
1489 | ||
0b86a832 | 1490 | key.objectid = device->devid; |
2b82032c | 1491 | key.offset = start; |
0b86a832 CM |
1492 | key.type = BTRFS_DEV_EXTENT_KEY; |
1493 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1494 | sizeof(*extent)); | |
2cdcecbc MF |
1495 | if (ret) |
1496 | goto out; | |
0b86a832 CM |
1497 | |
1498 | leaf = path->nodes[0]; | |
1499 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1500 | struct btrfs_dev_extent); | |
e17cade2 CM |
1501 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
1502 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
1503 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
1504 | ||
1505 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
231e88f4 | 1506 | btrfs_dev_extent_chunk_tree_uuid(extent), BTRFS_UUID_SIZE); |
e17cade2 | 1507 | |
0b86a832 CM |
1508 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
1509 | btrfs_mark_buffer_dirty(leaf); | |
2cdcecbc | 1510 | out: |
0b86a832 CM |
1511 | btrfs_free_path(path); |
1512 | return ret; | |
1513 | } | |
1514 | ||
6df9a95e | 1515 | static u64 find_next_chunk(struct btrfs_fs_info *fs_info) |
0b86a832 | 1516 | { |
6df9a95e JB |
1517 | struct extent_map_tree *em_tree; |
1518 | struct extent_map *em; | |
1519 | struct rb_node *n; | |
1520 | u64 ret = 0; | |
0b86a832 | 1521 | |
6df9a95e JB |
1522 | em_tree = &fs_info->mapping_tree.map_tree; |
1523 | read_lock(&em_tree->lock); | |
1524 | n = rb_last(&em_tree->map); | |
1525 | if (n) { | |
1526 | em = rb_entry(n, struct extent_map, rb_node); | |
1527 | ret = em->start + em->len; | |
0b86a832 | 1528 | } |
6df9a95e JB |
1529 | read_unlock(&em_tree->lock); |
1530 | ||
0b86a832 CM |
1531 | return ret; |
1532 | } | |
1533 | ||
53f10659 ID |
1534 | static noinline int find_next_devid(struct btrfs_fs_info *fs_info, |
1535 | u64 *devid_ret) | |
0b86a832 CM |
1536 | { |
1537 | int ret; | |
1538 | struct btrfs_key key; | |
1539 | struct btrfs_key found_key; | |
2b82032c YZ |
1540 | struct btrfs_path *path; |
1541 | ||
2b82032c YZ |
1542 | path = btrfs_alloc_path(); |
1543 | if (!path) | |
1544 | return -ENOMEM; | |
0b86a832 CM |
1545 | |
1546 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1547 | key.type = BTRFS_DEV_ITEM_KEY; | |
1548 | key.offset = (u64)-1; | |
1549 | ||
53f10659 | 1550 | ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, path, 0, 0); |
0b86a832 CM |
1551 | if (ret < 0) |
1552 | goto error; | |
1553 | ||
79787eaa | 1554 | BUG_ON(ret == 0); /* Corruption */ |
0b86a832 | 1555 | |
53f10659 ID |
1556 | ret = btrfs_previous_item(fs_info->chunk_root, path, |
1557 | BTRFS_DEV_ITEMS_OBJECTID, | |
0b86a832 CM |
1558 | BTRFS_DEV_ITEM_KEY); |
1559 | if (ret) { | |
53f10659 | 1560 | *devid_ret = 1; |
0b86a832 CM |
1561 | } else { |
1562 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1563 | path->slots[0]); | |
53f10659 | 1564 | *devid_ret = found_key.offset + 1; |
0b86a832 CM |
1565 | } |
1566 | ret = 0; | |
1567 | error: | |
2b82032c | 1568 | btrfs_free_path(path); |
0b86a832 CM |
1569 | return ret; |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * the device information is stored in the chunk root | |
1574 | * the btrfs_device struct should be fully filled in | |
1575 | */ | |
48a3b636 ES |
1576 | static int btrfs_add_device(struct btrfs_trans_handle *trans, |
1577 | struct btrfs_root *root, | |
1578 | struct btrfs_device *device) | |
0b86a832 CM |
1579 | { |
1580 | int ret; | |
1581 | struct btrfs_path *path; | |
1582 | struct btrfs_dev_item *dev_item; | |
1583 | struct extent_buffer *leaf; | |
1584 | struct btrfs_key key; | |
1585 | unsigned long ptr; | |
0b86a832 CM |
1586 | |
1587 | root = root->fs_info->chunk_root; | |
1588 | ||
1589 | path = btrfs_alloc_path(); | |
1590 | if (!path) | |
1591 | return -ENOMEM; | |
1592 | ||
0b86a832 CM |
1593 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1594 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 1595 | key.offset = device->devid; |
0b86a832 CM |
1596 | |
1597 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 1598 | sizeof(*dev_item)); |
0b86a832 CM |
1599 | if (ret) |
1600 | goto out; | |
1601 | ||
1602 | leaf = path->nodes[0]; | |
1603 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1604 | ||
1605 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 1606 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
1607 | btrfs_set_device_type(leaf, dev_item, device->type); |
1608 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1609 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1610 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
7cc8e58d MX |
1611 | btrfs_set_device_total_bytes(leaf, dev_item, |
1612 | btrfs_device_get_disk_total_bytes(device)); | |
1613 | btrfs_set_device_bytes_used(leaf, dev_item, | |
1614 | btrfs_device_get_bytes_used(device)); | |
e17cade2 CM |
1615 | btrfs_set_device_group(leaf, dev_item, 0); |
1616 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
1617 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 1618 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 1619 | |
410ba3a2 | 1620 | ptr = btrfs_device_uuid(dev_item); |
e17cade2 | 1621 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
1473b24e | 1622 | ptr = btrfs_device_fsid(dev_item); |
2b82032c | 1623 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 1624 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 1625 | |
2b82032c | 1626 | ret = 0; |
0b86a832 CM |
1627 | out: |
1628 | btrfs_free_path(path); | |
1629 | return ret; | |
1630 | } | |
8f18cf13 | 1631 | |
5a1972bd QW |
1632 | /* |
1633 | * Function to update ctime/mtime for a given device path. | |
1634 | * Mainly used for ctime/mtime based probe like libblkid. | |
1635 | */ | |
1636 | static void update_dev_time(char *path_name) | |
1637 | { | |
1638 | struct file *filp; | |
1639 | ||
1640 | filp = filp_open(path_name, O_RDWR, 0); | |
98af592f | 1641 | if (IS_ERR(filp)) |
5a1972bd QW |
1642 | return; |
1643 | file_update_time(filp); | |
1644 | filp_close(filp, NULL); | |
1645 | return; | |
1646 | } | |
1647 | ||
a061fc8d CM |
1648 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
1649 | struct btrfs_device *device) | |
1650 | { | |
1651 | int ret; | |
1652 | struct btrfs_path *path; | |
a061fc8d | 1653 | struct btrfs_key key; |
a061fc8d CM |
1654 | struct btrfs_trans_handle *trans; |
1655 | ||
1656 | root = root->fs_info->chunk_root; | |
1657 | ||
1658 | path = btrfs_alloc_path(); | |
1659 | if (!path) | |
1660 | return -ENOMEM; | |
1661 | ||
a22285a6 | 1662 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1663 | if (IS_ERR(trans)) { |
1664 | btrfs_free_path(path); | |
1665 | return PTR_ERR(trans); | |
1666 | } | |
a061fc8d CM |
1667 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1668 | key.type = BTRFS_DEV_ITEM_KEY; | |
1669 | key.offset = device->devid; | |
1670 | ||
1671 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1672 | if (ret < 0) | |
1673 | goto out; | |
1674 | ||
1675 | if (ret > 0) { | |
1676 | ret = -ENOENT; | |
1677 | goto out; | |
1678 | } | |
1679 | ||
1680 | ret = btrfs_del_item(trans, root, path); | |
1681 | if (ret) | |
1682 | goto out; | |
a061fc8d CM |
1683 | out: |
1684 | btrfs_free_path(path); | |
1685 | btrfs_commit_transaction(trans, root); | |
1686 | return ret; | |
1687 | } | |
1688 | ||
1689 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
1690 | { | |
1691 | struct btrfs_device *device; | |
2b82032c | 1692 | struct btrfs_device *next_device; |
a061fc8d | 1693 | struct block_device *bdev; |
dfe25020 | 1694 | struct buffer_head *bh = NULL; |
a061fc8d | 1695 | struct btrfs_super_block *disk_super; |
1f78160c | 1696 | struct btrfs_fs_devices *cur_devices; |
a061fc8d CM |
1697 | u64 all_avail; |
1698 | u64 devid; | |
2b82032c YZ |
1699 | u64 num_devices; |
1700 | u8 *dev_uuid; | |
de98ced9 | 1701 | unsigned seq; |
a061fc8d | 1702 | int ret = 0; |
1f78160c | 1703 | bool clear_super = false; |
a061fc8d | 1704 | |
a061fc8d CM |
1705 | mutex_lock(&uuid_mutex); |
1706 | ||
de98ced9 MX |
1707 | do { |
1708 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
1709 | ||
1710 | all_avail = root->fs_info->avail_data_alloc_bits | | |
1711 | root->fs_info->avail_system_alloc_bits | | |
1712 | root->fs_info->avail_metadata_alloc_bits; | |
1713 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
a061fc8d | 1714 | |
8dabb742 SB |
1715 | num_devices = root->fs_info->fs_devices->num_devices; |
1716 | btrfs_dev_replace_lock(&root->fs_info->dev_replace); | |
1717 | if (btrfs_dev_replace_is_ongoing(&root->fs_info->dev_replace)) { | |
1718 | WARN_ON(num_devices < 1); | |
1719 | num_devices--; | |
1720 | } | |
1721 | btrfs_dev_replace_unlock(&root->fs_info->dev_replace); | |
1722 | ||
1723 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && num_devices <= 4) { | |
183860f6 | 1724 | ret = BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET; |
a061fc8d CM |
1725 | goto out; |
1726 | } | |
1727 | ||
8dabb742 | 1728 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && num_devices <= 2) { |
183860f6 | 1729 | ret = BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET; |
a061fc8d CM |
1730 | goto out; |
1731 | } | |
1732 | ||
53b381b3 DW |
1733 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID5) && |
1734 | root->fs_info->fs_devices->rw_devices <= 2) { | |
183860f6 | 1735 | ret = BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET; |
53b381b3 DW |
1736 | goto out; |
1737 | } | |
1738 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID6) && | |
1739 | root->fs_info->fs_devices->rw_devices <= 3) { | |
183860f6 | 1740 | ret = BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET; |
53b381b3 DW |
1741 | goto out; |
1742 | } | |
1743 | ||
dfe25020 | 1744 | if (strcmp(device_path, "missing") == 0) { |
dfe25020 CM |
1745 | struct list_head *devices; |
1746 | struct btrfs_device *tmp; | |
a061fc8d | 1747 | |
dfe25020 CM |
1748 | device = NULL; |
1749 | devices = &root->fs_info->fs_devices->devices; | |
46224705 XG |
1750 | /* |
1751 | * It is safe to read the devices since the volume_mutex | |
1752 | * is held. | |
1753 | */ | |
c6e30871 | 1754 | list_for_each_entry(tmp, devices, dev_list) { |
63a212ab SB |
1755 | if (tmp->in_fs_metadata && |
1756 | !tmp->is_tgtdev_for_dev_replace && | |
1757 | !tmp->bdev) { | |
dfe25020 CM |
1758 | device = tmp; |
1759 | break; | |
1760 | } | |
1761 | } | |
1762 | bdev = NULL; | |
1763 | bh = NULL; | |
1764 | disk_super = NULL; | |
1765 | if (!device) { | |
183860f6 | 1766 | ret = BTRFS_ERROR_DEV_MISSING_NOT_FOUND; |
dfe25020 CM |
1767 | goto out; |
1768 | } | |
dfe25020 | 1769 | } else { |
beaf8ab3 | 1770 | ret = btrfs_get_bdev_and_sb(device_path, |
cc975eb4 | 1771 | FMODE_WRITE | FMODE_EXCL, |
beaf8ab3 SB |
1772 | root->fs_info->bdev_holder, 0, |
1773 | &bdev, &bh); | |
1774 | if (ret) | |
dfe25020 | 1775 | goto out; |
dfe25020 | 1776 | disk_super = (struct btrfs_super_block *)bh->b_data; |
a343832f | 1777 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
2b82032c | 1778 | dev_uuid = disk_super->dev_item.uuid; |
aa1b8cd4 | 1779 | device = btrfs_find_device(root->fs_info, devid, dev_uuid, |
2b82032c | 1780 | disk_super->fsid); |
dfe25020 CM |
1781 | if (!device) { |
1782 | ret = -ENOENT; | |
1783 | goto error_brelse; | |
1784 | } | |
2b82032c | 1785 | } |
dfe25020 | 1786 | |
63a212ab | 1787 | if (device->is_tgtdev_for_dev_replace) { |
183860f6 | 1788 | ret = BTRFS_ERROR_DEV_TGT_REPLACE; |
63a212ab SB |
1789 | goto error_brelse; |
1790 | } | |
1791 | ||
2b82032c | 1792 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
183860f6 | 1793 | ret = BTRFS_ERROR_DEV_ONLY_WRITABLE; |
2b82032c YZ |
1794 | goto error_brelse; |
1795 | } | |
1796 | ||
1797 | if (device->writeable) { | |
0c1daee0 | 1798 | lock_chunks(root); |
2b82032c | 1799 | list_del_init(&device->dev_alloc_list); |
c3929c36 | 1800 | device->fs_devices->rw_devices--; |
0c1daee0 | 1801 | unlock_chunks(root); |
1f78160c | 1802 | clear_super = true; |
dfe25020 | 1803 | } |
a061fc8d | 1804 | |
d7901554 | 1805 | mutex_unlock(&uuid_mutex); |
a061fc8d | 1806 | ret = btrfs_shrink_device(device, 0); |
d7901554 | 1807 | mutex_lock(&uuid_mutex); |
a061fc8d | 1808 | if (ret) |
9b3517e9 | 1809 | goto error_undo; |
a061fc8d | 1810 | |
63a212ab SB |
1811 | /* |
1812 | * TODO: the superblock still includes this device in its num_devices | |
1813 | * counter although write_all_supers() is not locked out. This | |
1814 | * could give a filesystem state which requires a degraded mount. | |
1815 | */ | |
a061fc8d CM |
1816 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
1817 | if (ret) | |
9b3517e9 | 1818 | goto error_undo; |
a061fc8d | 1819 | |
2b82032c | 1820 | device->in_fs_metadata = 0; |
aa1b8cd4 | 1821 | btrfs_scrub_cancel_dev(root->fs_info, device); |
e5e9a520 CM |
1822 | |
1823 | /* | |
1824 | * the device list mutex makes sure that we don't change | |
1825 | * the device list while someone else is writing out all | |
d7306801 FDBM |
1826 | * the device supers. Whoever is writing all supers, should |
1827 | * lock the device list mutex before getting the number of | |
1828 | * devices in the super block (super_copy). Conversely, | |
1829 | * whoever updates the number of devices in the super block | |
1830 | * (super_copy) should hold the device list mutex. | |
e5e9a520 | 1831 | */ |
1f78160c XG |
1832 | |
1833 | cur_devices = device->fs_devices; | |
e5e9a520 | 1834 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
1f78160c | 1835 | list_del_rcu(&device->dev_list); |
e5e9a520 | 1836 | |
e4404d6e | 1837 | device->fs_devices->num_devices--; |
02db0844 | 1838 | device->fs_devices->total_devices--; |
2b82032c | 1839 | |
cd02dca5 | 1840 | if (device->missing) |
3a7d55c8 | 1841 | device->fs_devices->missing_devices--; |
cd02dca5 | 1842 | |
2b82032c YZ |
1843 | next_device = list_entry(root->fs_info->fs_devices->devices.next, |
1844 | struct btrfs_device, dev_list); | |
1845 | if (device->bdev == root->fs_info->sb->s_bdev) | |
1846 | root->fs_info->sb->s_bdev = next_device->bdev; | |
1847 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) | |
1848 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1849 | ||
0bfaa9c5 | 1850 | if (device->bdev) { |
e4404d6e | 1851 | device->fs_devices->open_devices--; |
0bfaa9c5 | 1852 | /* remove sysfs entry */ |
32576040 | 1853 | btrfs_sysfs_rm_device_link(root->fs_info->fs_devices, device); |
0bfaa9c5 | 1854 | } |
99994cde | 1855 | |
1f78160c | 1856 | call_rcu(&device->rcu, free_device); |
e4404d6e | 1857 | |
6c41761f DS |
1858 | num_devices = btrfs_super_num_devices(root->fs_info->super_copy) - 1; |
1859 | btrfs_set_super_num_devices(root->fs_info->super_copy, num_devices); | |
d7306801 | 1860 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
2b82032c | 1861 | |
1f78160c | 1862 | if (cur_devices->open_devices == 0) { |
e4404d6e YZ |
1863 | struct btrfs_fs_devices *fs_devices; |
1864 | fs_devices = root->fs_info->fs_devices; | |
1865 | while (fs_devices) { | |
8321cf25 RS |
1866 | if (fs_devices->seed == cur_devices) { |
1867 | fs_devices->seed = cur_devices->seed; | |
e4404d6e | 1868 | break; |
8321cf25 | 1869 | } |
e4404d6e | 1870 | fs_devices = fs_devices->seed; |
2b82032c | 1871 | } |
1f78160c | 1872 | cur_devices->seed = NULL; |
1f78160c | 1873 | __btrfs_close_devices(cur_devices); |
1f78160c | 1874 | free_fs_devices(cur_devices); |
2b82032c YZ |
1875 | } |
1876 | ||
5af3e8cc SB |
1877 | root->fs_info->num_tolerated_disk_barrier_failures = |
1878 | btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info); | |
1879 | ||
2b82032c YZ |
1880 | /* |
1881 | * at this point, the device is zero sized. We want to | |
1882 | * remove it from the devices list and zero out the old super | |
1883 | */ | |
aa1b8cd4 | 1884 | if (clear_super && disk_super) { |
4d90d28b AJ |
1885 | u64 bytenr; |
1886 | int i; | |
1887 | ||
dfe25020 CM |
1888 | /* make sure this device isn't detected as part of |
1889 | * the FS anymore | |
1890 | */ | |
1891 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
1892 | set_buffer_dirty(bh); | |
1893 | sync_dirty_buffer(bh); | |
4d90d28b AJ |
1894 | |
1895 | /* clear the mirror copies of super block on the disk | |
1896 | * being removed, 0th copy is been taken care above and | |
1897 | * the below would take of the rest | |
1898 | */ | |
1899 | for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
1900 | bytenr = btrfs_sb_offset(i); | |
1901 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= | |
1902 | i_size_read(bdev->bd_inode)) | |
1903 | break; | |
1904 | ||
1905 | brelse(bh); | |
1906 | bh = __bread(bdev, bytenr / 4096, | |
1907 | BTRFS_SUPER_INFO_SIZE); | |
1908 | if (!bh) | |
1909 | continue; | |
1910 | ||
1911 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
1912 | ||
1913 | if (btrfs_super_bytenr(disk_super) != bytenr || | |
1914 | btrfs_super_magic(disk_super) != BTRFS_MAGIC) { | |
1915 | continue; | |
1916 | } | |
1917 | memset(&disk_super->magic, 0, | |
1918 | sizeof(disk_super->magic)); | |
1919 | set_buffer_dirty(bh); | |
1920 | sync_dirty_buffer(bh); | |
1921 | } | |
dfe25020 | 1922 | } |
a061fc8d | 1923 | |
a061fc8d | 1924 | ret = 0; |
a061fc8d | 1925 | |
5a1972bd QW |
1926 | if (bdev) { |
1927 | /* Notify udev that device has changed */ | |
3c911608 | 1928 | btrfs_kobject_uevent(bdev, KOBJ_CHANGE); |
b8b8ff59 | 1929 | |
5a1972bd QW |
1930 | /* Update ctime/mtime for device path for libblkid */ |
1931 | update_dev_time(device_path); | |
1932 | } | |
1933 | ||
a061fc8d CM |
1934 | error_brelse: |
1935 | brelse(bh); | |
dfe25020 | 1936 | if (bdev) |
e525fd89 | 1937 | blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
a061fc8d CM |
1938 | out: |
1939 | mutex_unlock(&uuid_mutex); | |
a061fc8d | 1940 | return ret; |
9b3517e9 ID |
1941 | error_undo: |
1942 | if (device->writeable) { | |
0c1daee0 | 1943 | lock_chunks(root); |
9b3517e9 ID |
1944 | list_add(&device->dev_alloc_list, |
1945 | &root->fs_info->fs_devices->alloc_list); | |
c3929c36 | 1946 | device->fs_devices->rw_devices++; |
0c1daee0 | 1947 | unlock_chunks(root); |
9b3517e9 ID |
1948 | } |
1949 | goto error_brelse; | |
a061fc8d CM |
1950 | } |
1951 | ||
084b6e7c QW |
1952 | void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_fs_info *fs_info, |
1953 | struct btrfs_device *srcdev) | |
e93c89c1 | 1954 | { |
d51908ce AJ |
1955 | struct btrfs_fs_devices *fs_devices; |
1956 | ||
e93c89c1 | 1957 | WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex)); |
1357272f | 1958 | |
25e8e911 AJ |
1959 | /* |
1960 | * in case of fs with no seed, srcdev->fs_devices will point | |
1961 | * to fs_devices of fs_info. However when the dev being replaced is | |
1962 | * a seed dev it will point to the seed's local fs_devices. In short | |
1963 | * srcdev will have its correct fs_devices in both the cases. | |
1964 | */ | |
1965 | fs_devices = srcdev->fs_devices; | |
d51908ce | 1966 | |
e93c89c1 SB |
1967 | list_del_rcu(&srcdev->dev_list); |
1968 | list_del_rcu(&srcdev->dev_alloc_list); | |
d51908ce | 1969 | fs_devices->num_devices--; |
82372bc8 | 1970 | if (srcdev->missing) |
d51908ce | 1971 | fs_devices->missing_devices--; |
e93c89c1 | 1972 | |
82372bc8 MX |
1973 | if (srcdev->writeable) { |
1974 | fs_devices->rw_devices--; | |
1975 | /* zero out the old super if it is writable */ | |
12b1c263 AJ |
1976 | btrfs_scratch_superblocks(srcdev->bdev, |
1977 | rcu_str_deref(srcdev->name)); | |
1357272f ID |
1978 | } |
1979 | ||
82372bc8 | 1980 | if (srcdev->bdev) |
d51908ce | 1981 | fs_devices->open_devices--; |
084b6e7c QW |
1982 | } |
1983 | ||
1984 | void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info, | |
1985 | struct btrfs_device *srcdev) | |
1986 | { | |
1987 | struct btrfs_fs_devices *fs_devices = srcdev->fs_devices; | |
e93c89c1 SB |
1988 | |
1989 | call_rcu(&srcdev->rcu, free_device); | |
94d5f0c2 AJ |
1990 | |
1991 | /* | |
1992 | * unless fs_devices is seed fs, num_devices shouldn't go | |
1993 | * zero | |
1994 | */ | |
1995 | BUG_ON(!fs_devices->num_devices && !fs_devices->seeding); | |
1996 | ||
1997 | /* if this is no devs we rather delete the fs_devices */ | |
1998 | if (!fs_devices->num_devices) { | |
1999 | struct btrfs_fs_devices *tmp_fs_devices; | |
2000 | ||
2001 | tmp_fs_devices = fs_info->fs_devices; | |
2002 | while (tmp_fs_devices) { | |
2003 | if (tmp_fs_devices->seed == fs_devices) { | |
2004 | tmp_fs_devices->seed = fs_devices->seed; | |
2005 | break; | |
2006 | } | |
2007 | tmp_fs_devices = tmp_fs_devices->seed; | |
2008 | } | |
2009 | fs_devices->seed = NULL; | |
8bef8401 AJ |
2010 | __btrfs_close_devices(fs_devices); |
2011 | free_fs_devices(fs_devices); | |
94d5f0c2 | 2012 | } |
e93c89c1 SB |
2013 | } |
2014 | ||
2015 | void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
2016 | struct btrfs_device *tgtdev) | |
2017 | { | |
2018 | struct btrfs_device *next_device; | |
2019 | ||
67a2c45e | 2020 | mutex_lock(&uuid_mutex); |
e93c89c1 SB |
2021 | WARN_ON(!tgtdev); |
2022 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
d2ff1b20 | 2023 | |
32576040 | 2024 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, tgtdev); |
d2ff1b20 | 2025 | |
e93c89c1 | 2026 | if (tgtdev->bdev) { |
12b1c263 AJ |
2027 | btrfs_scratch_superblocks(tgtdev->bdev, |
2028 | rcu_str_deref(tgtdev->name)); | |
e93c89c1 SB |
2029 | fs_info->fs_devices->open_devices--; |
2030 | } | |
2031 | fs_info->fs_devices->num_devices--; | |
e93c89c1 SB |
2032 | |
2033 | next_device = list_entry(fs_info->fs_devices->devices.next, | |
2034 | struct btrfs_device, dev_list); | |
2035 | if (tgtdev->bdev == fs_info->sb->s_bdev) | |
2036 | fs_info->sb->s_bdev = next_device->bdev; | |
2037 | if (tgtdev->bdev == fs_info->fs_devices->latest_bdev) | |
2038 | fs_info->fs_devices->latest_bdev = next_device->bdev; | |
2039 | list_del_rcu(&tgtdev->dev_list); | |
2040 | ||
2041 | call_rcu(&tgtdev->rcu, free_device); | |
2042 | ||
2043 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
67a2c45e | 2044 | mutex_unlock(&uuid_mutex); |
e93c89c1 SB |
2045 | } |
2046 | ||
48a3b636 ES |
2047 | static int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path, |
2048 | struct btrfs_device **device) | |
7ba15b7d SB |
2049 | { |
2050 | int ret = 0; | |
2051 | struct btrfs_super_block *disk_super; | |
2052 | u64 devid; | |
2053 | u8 *dev_uuid; | |
2054 | struct block_device *bdev; | |
2055 | struct buffer_head *bh; | |
2056 | ||
2057 | *device = NULL; | |
2058 | ret = btrfs_get_bdev_and_sb(device_path, FMODE_READ, | |
2059 | root->fs_info->bdev_holder, 0, &bdev, &bh); | |
2060 | if (ret) | |
2061 | return ret; | |
2062 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
2063 | devid = btrfs_stack_device_id(&disk_super->dev_item); | |
2064 | dev_uuid = disk_super->dev_item.uuid; | |
aa1b8cd4 | 2065 | *device = btrfs_find_device(root->fs_info, devid, dev_uuid, |
7ba15b7d SB |
2066 | disk_super->fsid); |
2067 | brelse(bh); | |
2068 | if (!*device) | |
2069 | ret = -ENOENT; | |
2070 | blkdev_put(bdev, FMODE_READ); | |
2071 | return ret; | |
2072 | } | |
2073 | ||
2074 | int btrfs_find_device_missing_or_by_path(struct btrfs_root *root, | |
2075 | char *device_path, | |
2076 | struct btrfs_device **device) | |
2077 | { | |
2078 | *device = NULL; | |
2079 | if (strcmp(device_path, "missing") == 0) { | |
2080 | struct list_head *devices; | |
2081 | struct btrfs_device *tmp; | |
2082 | ||
2083 | devices = &root->fs_info->fs_devices->devices; | |
2084 | /* | |
2085 | * It is safe to read the devices since the volume_mutex | |
2086 | * is held by the caller. | |
2087 | */ | |
2088 | list_for_each_entry(tmp, devices, dev_list) { | |
2089 | if (tmp->in_fs_metadata && !tmp->bdev) { | |
2090 | *device = tmp; | |
2091 | break; | |
2092 | } | |
2093 | } | |
2094 | ||
d74a6259 AJ |
2095 | if (!*device) |
2096 | return BTRFS_ERROR_DEV_MISSING_NOT_FOUND; | |
7ba15b7d SB |
2097 | |
2098 | return 0; | |
2099 | } else { | |
2100 | return btrfs_find_device_by_path(root, device_path, device); | |
2101 | } | |
2102 | } | |
2103 | ||
2b82032c YZ |
2104 | /* |
2105 | * does all the dirty work required for changing file system's UUID. | |
2106 | */ | |
125ccb0a | 2107 | static int btrfs_prepare_sprout(struct btrfs_root *root) |
2b82032c YZ |
2108 | { |
2109 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2110 | struct btrfs_fs_devices *old_devices; | |
e4404d6e | 2111 | struct btrfs_fs_devices *seed_devices; |
6c41761f | 2112 | struct btrfs_super_block *disk_super = root->fs_info->super_copy; |
2b82032c YZ |
2113 | struct btrfs_device *device; |
2114 | u64 super_flags; | |
2115 | ||
2116 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 2117 | if (!fs_devices->seeding) |
2b82032c YZ |
2118 | return -EINVAL; |
2119 | ||
2208a378 ID |
2120 | seed_devices = __alloc_fs_devices(); |
2121 | if (IS_ERR(seed_devices)) | |
2122 | return PTR_ERR(seed_devices); | |
2b82032c | 2123 | |
e4404d6e YZ |
2124 | old_devices = clone_fs_devices(fs_devices); |
2125 | if (IS_ERR(old_devices)) { | |
2126 | kfree(seed_devices); | |
2127 | return PTR_ERR(old_devices); | |
2b82032c | 2128 | } |
e4404d6e | 2129 | |
2b82032c YZ |
2130 | list_add(&old_devices->list, &fs_uuids); |
2131 | ||
e4404d6e YZ |
2132 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
2133 | seed_devices->opened = 1; | |
2134 | INIT_LIST_HEAD(&seed_devices->devices); | |
2135 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
e5e9a520 | 2136 | mutex_init(&seed_devices->device_list_mutex); |
c9513edb XG |
2137 | |
2138 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c XG |
2139 | list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices, |
2140 | synchronize_rcu); | |
2196d6e8 MX |
2141 | list_for_each_entry(device, &seed_devices->devices, dev_list) |
2142 | device->fs_devices = seed_devices; | |
c9513edb | 2143 | |
2196d6e8 | 2144 | lock_chunks(root); |
e4404d6e | 2145 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); |
2196d6e8 | 2146 | unlock_chunks(root); |
e4404d6e | 2147 | |
2b82032c YZ |
2148 | fs_devices->seeding = 0; |
2149 | fs_devices->num_devices = 0; | |
2150 | fs_devices->open_devices = 0; | |
69611ac8 | 2151 | fs_devices->missing_devices = 0; |
69611ac8 | 2152 | fs_devices->rotating = 0; |
e4404d6e | 2153 | fs_devices->seed = seed_devices; |
2b82032c YZ |
2154 | |
2155 | generate_random_uuid(fs_devices->fsid); | |
2156 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
2157 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
f7171750 FDBM |
2158 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
2159 | ||
2b82032c YZ |
2160 | super_flags = btrfs_super_flags(disk_super) & |
2161 | ~BTRFS_SUPER_FLAG_SEEDING; | |
2162 | btrfs_set_super_flags(disk_super, super_flags); | |
2163 | ||
2164 | return 0; | |
2165 | } | |
2166 | ||
2167 | /* | |
2168 | * strore the expected generation for seed devices in device items. | |
2169 | */ | |
2170 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
2171 | struct btrfs_root *root) | |
2172 | { | |
2173 | struct btrfs_path *path; | |
2174 | struct extent_buffer *leaf; | |
2175 | struct btrfs_dev_item *dev_item; | |
2176 | struct btrfs_device *device; | |
2177 | struct btrfs_key key; | |
2178 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
2179 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
2180 | u64 devid; | |
2181 | int ret; | |
2182 | ||
2183 | path = btrfs_alloc_path(); | |
2184 | if (!path) | |
2185 | return -ENOMEM; | |
2186 | ||
2187 | root = root->fs_info->chunk_root; | |
2188 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
2189 | key.offset = 0; | |
2190 | key.type = BTRFS_DEV_ITEM_KEY; | |
2191 | ||
2192 | while (1) { | |
2193 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
2194 | if (ret < 0) | |
2195 | goto error; | |
2196 | ||
2197 | leaf = path->nodes[0]; | |
2198 | next_slot: | |
2199 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
2200 | ret = btrfs_next_leaf(root, path); | |
2201 | if (ret > 0) | |
2202 | break; | |
2203 | if (ret < 0) | |
2204 | goto error; | |
2205 | leaf = path->nodes[0]; | |
2206 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 2207 | btrfs_release_path(path); |
2b82032c YZ |
2208 | continue; |
2209 | } | |
2210 | ||
2211 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
2212 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
2213 | key.type != BTRFS_DEV_ITEM_KEY) | |
2214 | break; | |
2215 | ||
2216 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
2217 | struct btrfs_dev_item); | |
2218 | devid = btrfs_device_id(leaf, dev_item); | |
410ba3a2 | 2219 | read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item), |
2b82032c | 2220 | BTRFS_UUID_SIZE); |
1473b24e | 2221 | read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item), |
2b82032c | 2222 | BTRFS_UUID_SIZE); |
aa1b8cd4 SB |
2223 | device = btrfs_find_device(root->fs_info, devid, dev_uuid, |
2224 | fs_uuid); | |
79787eaa | 2225 | BUG_ON(!device); /* Logic error */ |
2b82032c YZ |
2226 | |
2227 | if (device->fs_devices->seeding) { | |
2228 | btrfs_set_device_generation(leaf, dev_item, | |
2229 | device->generation); | |
2230 | btrfs_mark_buffer_dirty(leaf); | |
2231 | } | |
2232 | ||
2233 | path->slots[0]++; | |
2234 | goto next_slot; | |
2235 | } | |
2236 | ret = 0; | |
2237 | error: | |
2238 | btrfs_free_path(path); | |
2239 | return ret; | |
2240 | } | |
2241 | ||
788f20eb CM |
2242 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
2243 | { | |
d5e2003c | 2244 | struct request_queue *q; |
788f20eb CM |
2245 | struct btrfs_trans_handle *trans; |
2246 | struct btrfs_device *device; | |
2247 | struct block_device *bdev; | |
788f20eb | 2248 | struct list_head *devices; |
2b82032c | 2249 | struct super_block *sb = root->fs_info->sb; |
606686ee | 2250 | struct rcu_string *name; |
3c1dbdf5 | 2251 | u64 tmp; |
2b82032c | 2252 | int seeding_dev = 0; |
788f20eb CM |
2253 | int ret = 0; |
2254 | ||
2b82032c | 2255 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
f8c5d0b4 | 2256 | return -EROFS; |
788f20eb | 2257 | |
a5d16333 | 2258 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, |
d4d77629 | 2259 | root->fs_info->bdev_holder); |
7f59203a JB |
2260 | if (IS_ERR(bdev)) |
2261 | return PTR_ERR(bdev); | |
a2135011 | 2262 | |
2b82032c YZ |
2263 | if (root->fs_info->fs_devices->seeding) { |
2264 | seeding_dev = 1; | |
2265 | down_write(&sb->s_umount); | |
2266 | mutex_lock(&uuid_mutex); | |
2267 | } | |
2268 | ||
8c8bee1d | 2269 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
a2135011 | 2270 | |
788f20eb | 2271 | devices = &root->fs_info->fs_devices->devices; |
d25628bd LB |
2272 | |
2273 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
c6e30871 | 2274 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
2275 | if (device->bdev == bdev) { |
2276 | ret = -EEXIST; | |
d25628bd LB |
2277 | mutex_unlock( |
2278 | &root->fs_info->fs_devices->device_list_mutex); | |
2b82032c | 2279 | goto error; |
788f20eb CM |
2280 | } |
2281 | } | |
d25628bd | 2282 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 2283 | |
12bd2fc0 ID |
2284 | device = btrfs_alloc_device(root->fs_info, NULL, NULL); |
2285 | if (IS_ERR(device)) { | |
788f20eb | 2286 | /* we can safely leave the fs_devices entry around */ |
12bd2fc0 | 2287 | ret = PTR_ERR(device); |
2b82032c | 2288 | goto error; |
788f20eb CM |
2289 | } |
2290 | ||
606686ee JB |
2291 | name = rcu_string_strdup(device_path, GFP_NOFS); |
2292 | if (!name) { | |
788f20eb | 2293 | kfree(device); |
2b82032c YZ |
2294 | ret = -ENOMEM; |
2295 | goto error; | |
788f20eb | 2296 | } |
606686ee | 2297 | rcu_assign_pointer(device->name, name); |
2b82032c | 2298 | |
a22285a6 | 2299 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 2300 | if (IS_ERR(trans)) { |
606686ee | 2301 | rcu_string_free(device->name); |
98d5dc13 TI |
2302 | kfree(device); |
2303 | ret = PTR_ERR(trans); | |
2304 | goto error; | |
2305 | } | |
2306 | ||
d5e2003c JB |
2307 | q = bdev_get_queue(bdev); |
2308 | if (blk_queue_discard(q)) | |
2309 | device->can_discard = 1; | |
2b82032c | 2310 | device->writeable = 1; |
2b82032c | 2311 | device->generation = trans->transid; |
788f20eb CM |
2312 | device->io_width = root->sectorsize; |
2313 | device->io_align = root->sectorsize; | |
2314 | device->sector_size = root->sectorsize; | |
2315 | device->total_bytes = i_size_read(bdev->bd_inode); | |
2cc3c559 | 2316 | device->disk_total_bytes = device->total_bytes; |
935e5cc9 | 2317 | device->commit_total_bytes = device->total_bytes; |
788f20eb CM |
2318 | device->dev_root = root->fs_info->dev_root; |
2319 | device->bdev = bdev; | |
dfe25020 | 2320 | device->in_fs_metadata = 1; |
63a212ab | 2321 | device->is_tgtdev_for_dev_replace = 0; |
fb01aa85 | 2322 | device->mode = FMODE_EXCL; |
27087f37 | 2323 | device->dev_stats_valid = 1; |
2b82032c | 2324 | set_blocksize(device->bdev, 4096); |
788f20eb | 2325 | |
2b82032c YZ |
2326 | if (seeding_dev) { |
2327 | sb->s_flags &= ~MS_RDONLY; | |
125ccb0a | 2328 | ret = btrfs_prepare_sprout(root); |
79787eaa | 2329 | BUG_ON(ret); /* -ENOMEM */ |
2b82032c | 2330 | } |
788f20eb | 2331 | |
2b82032c | 2332 | device->fs_devices = root->fs_info->fs_devices; |
e5e9a520 | 2333 | |
e5e9a520 | 2334 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
2196d6e8 | 2335 | lock_chunks(root); |
1f78160c | 2336 | list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices); |
2b82032c YZ |
2337 | list_add(&device->dev_alloc_list, |
2338 | &root->fs_info->fs_devices->alloc_list); | |
2339 | root->fs_info->fs_devices->num_devices++; | |
2340 | root->fs_info->fs_devices->open_devices++; | |
2341 | root->fs_info->fs_devices->rw_devices++; | |
02db0844 | 2342 | root->fs_info->fs_devices->total_devices++; |
2b82032c | 2343 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; |
325cd4ba | 2344 | |
2bf64758 JB |
2345 | spin_lock(&root->fs_info->free_chunk_lock); |
2346 | root->fs_info->free_chunk_space += device->total_bytes; | |
2347 | spin_unlock(&root->fs_info->free_chunk_lock); | |
2348 | ||
c289811c CM |
2349 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
2350 | root->fs_info->fs_devices->rotating = 1; | |
2351 | ||
3c1dbdf5 | 2352 | tmp = btrfs_super_total_bytes(root->fs_info->super_copy); |
6c41761f | 2353 | btrfs_set_super_total_bytes(root->fs_info->super_copy, |
3c1dbdf5 | 2354 | tmp + device->total_bytes); |
788f20eb | 2355 | |
3c1dbdf5 | 2356 | tmp = btrfs_super_num_devices(root->fs_info->super_copy); |
6c41761f | 2357 | btrfs_set_super_num_devices(root->fs_info->super_copy, |
3c1dbdf5 | 2358 | tmp + 1); |
0d39376a AJ |
2359 | |
2360 | /* add sysfs device entry */ | |
e3bd6973 | 2361 | btrfs_sysfs_add_device_link(root->fs_info->fs_devices, device); |
0d39376a | 2362 | |
2196d6e8 MX |
2363 | /* |
2364 | * we've got more storage, clear any full flags on the space | |
2365 | * infos | |
2366 | */ | |
2367 | btrfs_clear_space_info_full(root->fs_info); | |
2368 | ||
2369 | unlock_chunks(root); | |
e5e9a520 | 2370 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 2371 | |
2b82032c | 2372 | if (seeding_dev) { |
2196d6e8 | 2373 | lock_chunks(root); |
2b82032c | 2374 | ret = init_first_rw_device(trans, root, device); |
2196d6e8 | 2375 | unlock_chunks(root); |
005d6427 DS |
2376 | if (ret) { |
2377 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 2378 | goto error_trans; |
005d6427 | 2379 | } |
2196d6e8 MX |
2380 | } |
2381 | ||
2382 | ret = btrfs_add_device(trans, root, device); | |
2383 | if (ret) { | |
2384 | btrfs_abort_transaction(trans, root, ret); | |
2385 | goto error_trans; | |
2386 | } | |
2387 | ||
2388 | if (seeding_dev) { | |
2389 | char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; | |
2390 | ||
2b82032c | 2391 | ret = btrfs_finish_sprout(trans, root); |
005d6427 DS |
2392 | if (ret) { |
2393 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 2394 | goto error_trans; |
005d6427 | 2395 | } |
b2373f25 AJ |
2396 | |
2397 | /* Sprouting would change fsid of the mounted root, | |
2398 | * so rename the fsid on the sysfs | |
2399 | */ | |
2400 | snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", | |
2401 | root->fs_info->fsid); | |
c1b7e474 | 2402 | if (kobject_rename(&root->fs_info->fs_devices->fsid_kobj, |
2e7910d6 | 2403 | fsid_buf)) |
f14d104d DS |
2404 | btrfs_warn(root->fs_info, |
2405 | "sysfs: failed to create fsid for sprout"); | |
2b82032c YZ |
2406 | } |
2407 | ||
5af3e8cc SB |
2408 | root->fs_info->num_tolerated_disk_barrier_failures = |
2409 | btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info); | |
79787eaa | 2410 | ret = btrfs_commit_transaction(trans, root); |
a2135011 | 2411 | |
2b82032c YZ |
2412 | if (seeding_dev) { |
2413 | mutex_unlock(&uuid_mutex); | |
2414 | up_write(&sb->s_umount); | |
788f20eb | 2415 | |
79787eaa JM |
2416 | if (ret) /* transaction commit */ |
2417 | return ret; | |
2418 | ||
2b82032c | 2419 | ret = btrfs_relocate_sys_chunks(root); |
79787eaa | 2420 | if (ret < 0) |
a4553fef | 2421 | btrfs_std_error(root->fs_info, ret, |
79787eaa JM |
2422 | "Failed to relocate sys chunks after " |
2423 | "device initialization. This can be fixed " | |
2424 | "using the \"btrfs balance\" command."); | |
671415b7 MX |
2425 | trans = btrfs_attach_transaction(root); |
2426 | if (IS_ERR(trans)) { | |
2427 | if (PTR_ERR(trans) == -ENOENT) | |
2428 | return 0; | |
2429 | return PTR_ERR(trans); | |
2430 | } | |
2431 | ret = btrfs_commit_transaction(trans, root); | |
2b82032c | 2432 | } |
c9e9f97b | 2433 | |
5a1972bd QW |
2434 | /* Update ctime/mtime for libblkid */ |
2435 | update_dev_time(device_path); | |
2b82032c | 2436 | return ret; |
79787eaa JM |
2437 | |
2438 | error_trans: | |
79787eaa | 2439 | btrfs_end_transaction(trans, root); |
606686ee | 2440 | rcu_string_free(device->name); |
32576040 | 2441 | btrfs_sysfs_rm_device_link(root->fs_info->fs_devices, device); |
79787eaa | 2442 | kfree(device); |
2b82032c | 2443 | error: |
e525fd89 | 2444 | blkdev_put(bdev, FMODE_EXCL); |
2b82032c YZ |
2445 | if (seeding_dev) { |
2446 | mutex_unlock(&uuid_mutex); | |
2447 | up_write(&sb->s_umount); | |
2448 | } | |
c9e9f97b | 2449 | return ret; |
788f20eb CM |
2450 | } |
2451 | ||
e93c89c1 | 2452 | int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path, |
1c43366d | 2453 | struct btrfs_device *srcdev, |
e93c89c1 SB |
2454 | struct btrfs_device **device_out) |
2455 | { | |
2456 | struct request_queue *q; | |
2457 | struct btrfs_device *device; | |
2458 | struct block_device *bdev; | |
2459 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2460 | struct list_head *devices; | |
2461 | struct rcu_string *name; | |
12bd2fc0 | 2462 | u64 devid = BTRFS_DEV_REPLACE_DEVID; |
e93c89c1 SB |
2463 | int ret = 0; |
2464 | ||
2465 | *device_out = NULL; | |
1c43366d MX |
2466 | if (fs_info->fs_devices->seeding) { |
2467 | btrfs_err(fs_info, "the filesystem is a seed filesystem!"); | |
e93c89c1 | 2468 | return -EINVAL; |
1c43366d | 2469 | } |
e93c89c1 SB |
2470 | |
2471 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, | |
2472 | fs_info->bdev_holder); | |
1c43366d MX |
2473 | if (IS_ERR(bdev)) { |
2474 | btrfs_err(fs_info, "target device %s is invalid!", device_path); | |
e93c89c1 | 2475 | return PTR_ERR(bdev); |
1c43366d | 2476 | } |
e93c89c1 SB |
2477 | |
2478 | filemap_write_and_wait(bdev->bd_inode->i_mapping); | |
2479 | ||
2480 | devices = &fs_info->fs_devices->devices; | |
2481 | list_for_each_entry(device, devices, dev_list) { | |
2482 | if (device->bdev == bdev) { | |
1c43366d | 2483 | btrfs_err(fs_info, "target device is in the filesystem!"); |
e93c89c1 SB |
2484 | ret = -EEXIST; |
2485 | goto error; | |
2486 | } | |
2487 | } | |
2488 | ||
1c43366d | 2489 | |
7cc8e58d MX |
2490 | if (i_size_read(bdev->bd_inode) < |
2491 | btrfs_device_get_total_bytes(srcdev)) { | |
1c43366d MX |
2492 | btrfs_err(fs_info, "target device is smaller than source device!"); |
2493 | ret = -EINVAL; | |
2494 | goto error; | |
2495 | } | |
2496 | ||
2497 | ||
12bd2fc0 ID |
2498 | device = btrfs_alloc_device(NULL, &devid, NULL); |
2499 | if (IS_ERR(device)) { | |
2500 | ret = PTR_ERR(device); | |
e93c89c1 SB |
2501 | goto error; |
2502 | } | |
2503 | ||
2504 | name = rcu_string_strdup(device_path, GFP_NOFS); | |
2505 | if (!name) { | |
2506 | kfree(device); | |
2507 | ret = -ENOMEM; | |
2508 | goto error; | |
2509 | } | |
2510 | rcu_assign_pointer(device->name, name); | |
2511 | ||
2512 | q = bdev_get_queue(bdev); | |
2513 | if (blk_queue_discard(q)) | |
2514 | device->can_discard = 1; | |
2515 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2516 | device->writeable = 1; | |
e93c89c1 SB |
2517 | device->generation = 0; |
2518 | device->io_width = root->sectorsize; | |
2519 | device->io_align = root->sectorsize; | |
2520 | device->sector_size = root->sectorsize; | |
7cc8e58d MX |
2521 | device->total_bytes = btrfs_device_get_total_bytes(srcdev); |
2522 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); | |
2523 | device->bytes_used = btrfs_device_get_bytes_used(srcdev); | |
935e5cc9 MX |
2524 | ASSERT(list_empty(&srcdev->resized_list)); |
2525 | device->commit_total_bytes = srcdev->commit_total_bytes; | |
ce7213c7 | 2526 | device->commit_bytes_used = device->bytes_used; |
e93c89c1 SB |
2527 | device->dev_root = fs_info->dev_root; |
2528 | device->bdev = bdev; | |
2529 | device->in_fs_metadata = 1; | |
2530 | device->is_tgtdev_for_dev_replace = 1; | |
2531 | device->mode = FMODE_EXCL; | |
27087f37 | 2532 | device->dev_stats_valid = 1; |
e93c89c1 SB |
2533 | set_blocksize(device->bdev, 4096); |
2534 | device->fs_devices = fs_info->fs_devices; | |
2535 | list_add(&device->dev_list, &fs_info->fs_devices->devices); | |
2536 | fs_info->fs_devices->num_devices++; | |
2537 | fs_info->fs_devices->open_devices++; | |
e93c89c1 SB |
2538 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
2539 | ||
2540 | *device_out = device; | |
2541 | return ret; | |
2542 | ||
2543 | error: | |
2544 | blkdev_put(bdev, FMODE_EXCL); | |
2545 | return ret; | |
2546 | } | |
2547 | ||
2548 | void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info, | |
2549 | struct btrfs_device *tgtdev) | |
2550 | { | |
2551 | WARN_ON(fs_info->fs_devices->rw_devices == 0); | |
2552 | tgtdev->io_width = fs_info->dev_root->sectorsize; | |
2553 | tgtdev->io_align = fs_info->dev_root->sectorsize; | |
2554 | tgtdev->sector_size = fs_info->dev_root->sectorsize; | |
2555 | tgtdev->dev_root = fs_info->dev_root; | |
2556 | tgtdev->in_fs_metadata = 1; | |
2557 | } | |
2558 | ||
d397712b CM |
2559 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
2560 | struct btrfs_device *device) | |
0b86a832 CM |
2561 | { |
2562 | int ret; | |
2563 | struct btrfs_path *path; | |
2564 | struct btrfs_root *root; | |
2565 | struct btrfs_dev_item *dev_item; | |
2566 | struct extent_buffer *leaf; | |
2567 | struct btrfs_key key; | |
2568 | ||
2569 | root = device->dev_root->fs_info->chunk_root; | |
2570 | ||
2571 | path = btrfs_alloc_path(); | |
2572 | if (!path) | |
2573 | return -ENOMEM; | |
2574 | ||
2575 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
2576 | key.type = BTRFS_DEV_ITEM_KEY; | |
2577 | key.offset = device->devid; | |
2578 | ||
2579 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
2580 | if (ret < 0) | |
2581 | goto out; | |
2582 | ||
2583 | if (ret > 0) { | |
2584 | ret = -ENOENT; | |
2585 | goto out; | |
2586 | } | |
2587 | ||
2588 | leaf = path->nodes[0]; | |
2589 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
2590 | ||
2591 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2592 | btrfs_set_device_type(leaf, dev_item, device->type); | |
2593 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
2594 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
2595 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
7cc8e58d MX |
2596 | btrfs_set_device_total_bytes(leaf, dev_item, |
2597 | btrfs_device_get_disk_total_bytes(device)); | |
2598 | btrfs_set_device_bytes_used(leaf, dev_item, | |
2599 | btrfs_device_get_bytes_used(device)); | |
0b86a832 CM |
2600 | btrfs_mark_buffer_dirty(leaf); |
2601 | ||
2602 | out: | |
2603 | btrfs_free_path(path); | |
2604 | return ret; | |
2605 | } | |
2606 | ||
2196d6e8 | 2607 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
2608 | struct btrfs_device *device, u64 new_size) |
2609 | { | |
2610 | struct btrfs_super_block *super_copy = | |
6c41761f | 2611 | device->dev_root->fs_info->super_copy; |
935e5cc9 | 2612 | struct btrfs_fs_devices *fs_devices; |
2196d6e8 MX |
2613 | u64 old_total; |
2614 | u64 diff; | |
8f18cf13 | 2615 | |
2b82032c YZ |
2616 | if (!device->writeable) |
2617 | return -EACCES; | |
2196d6e8 MX |
2618 | |
2619 | lock_chunks(device->dev_root); | |
2620 | old_total = btrfs_super_total_bytes(super_copy); | |
2621 | diff = new_size - device->total_bytes; | |
2622 | ||
63a212ab | 2623 | if (new_size <= device->total_bytes || |
2196d6e8 MX |
2624 | device->is_tgtdev_for_dev_replace) { |
2625 | unlock_chunks(device->dev_root); | |
2b82032c | 2626 | return -EINVAL; |
2196d6e8 | 2627 | } |
2b82032c | 2628 | |
935e5cc9 | 2629 | fs_devices = device->dev_root->fs_info->fs_devices; |
2b82032c | 2630 | |
8f18cf13 | 2631 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
2b82032c YZ |
2632 | device->fs_devices->total_rw_bytes += diff; |
2633 | ||
7cc8e58d MX |
2634 | btrfs_device_set_total_bytes(device, new_size); |
2635 | btrfs_device_set_disk_total_bytes(device, new_size); | |
4184ea7f | 2636 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
935e5cc9 MX |
2637 | if (list_empty(&device->resized_list)) |
2638 | list_add_tail(&device->resized_list, | |
2639 | &fs_devices->resized_devices); | |
2196d6e8 | 2640 | unlock_chunks(device->dev_root); |
4184ea7f | 2641 | |
8f18cf13 CM |
2642 | return btrfs_update_device(trans, device); |
2643 | } | |
2644 | ||
2645 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, | |
a688a04a | 2646 | struct btrfs_root *root, u64 chunk_objectid, |
8f18cf13 CM |
2647 | u64 chunk_offset) |
2648 | { | |
2649 | int ret; | |
2650 | struct btrfs_path *path; | |
2651 | struct btrfs_key key; | |
2652 | ||
2653 | root = root->fs_info->chunk_root; | |
2654 | path = btrfs_alloc_path(); | |
2655 | if (!path) | |
2656 | return -ENOMEM; | |
2657 | ||
2658 | key.objectid = chunk_objectid; | |
2659 | key.offset = chunk_offset; | |
2660 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2661 | ||
2662 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
79787eaa JM |
2663 | if (ret < 0) |
2664 | goto out; | |
2665 | else if (ret > 0) { /* Logic error or corruption */ | |
a4553fef | 2666 | btrfs_std_error(root->fs_info, -ENOENT, |
79787eaa JM |
2667 | "Failed lookup while freeing chunk."); |
2668 | ret = -ENOENT; | |
2669 | goto out; | |
2670 | } | |
8f18cf13 CM |
2671 | |
2672 | ret = btrfs_del_item(trans, root, path); | |
79787eaa | 2673 | if (ret < 0) |
a4553fef | 2674 | btrfs_std_error(root->fs_info, ret, |
79787eaa JM |
2675 | "Failed to delete chunk item."); |
2676 | out: | |
8f18cf13 | 2677 | btrfs_free_path(path); |
65a246c5 | 2678 | return ret; |
8f18cf13 CM |
2679 | } |
2680 | ||
b2950863 | 2681 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
8f18cf13 CM |
2682 | chunk_offset) |
2683 | { | |
6c41761f | 2684 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 CM |
2685 | struct btrfs_disk_key *disk_key; |
2686 | struct btrfs_chunk *chunk; | |
2687 | u8 *ptr; | |
2688 | int ret = 0; | |
2689 | u32 num_stripes; | |
2690 | u32 array_size; | |
2691 | u32 len = 0; | |
2692 | u32 cur; | |
2693 | struct btrfs_key key; | |
2694 | ||
2196d6e8 | 2695 | lock_chunks(root); |
8f18cf13 CM |
2696 | array_size = btrfs_super_sys_array_size(super_copy); |
2697 | ||
2698 | ptr = super_copy->sys_chunk_array; | |
2699 | cur = 0; | |
2700 | ||
2701 | while (cur < array_size) { | |
2702 | disk_key = (struct btrfs_disk_key *)ptr; | |
2703 | btrfs_disk_key_to_cpu(&key, disk_key); | |
2704 | ||
2705 | len = sizeof(*disk_key); | |
2706 | ||
2707 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
2708 | chunk = (struct btrfs_chunk *)(ptr + len); | |
2709 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
2710 | len += btrfs_chunk_item_size(num_stripes); | |
2711 | } else { | |
2712 | ret = -EIO; | |
2713 | break; | |
2714 | } | |
2715 | if (key.objectid == chunk_objectid && | |
2716 | key.offset == chunk_offset) { | |
2717 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
2718 | array_size -= len; | |
2719 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
2720 | } else { | |
2721 | ptr += len; | |
2722 | cur += len; | |
2723 | } | |
2724 | } | |
2196d6e8 | 2725 | unlock_chunks(root); |
8f18cf13 CM |
2726 | return ret; |
2727 | } | |
2728 | ||
47ab2a6c JB |
2729 | int btrfs_remove_chunk(struct btrfs_trans_handle *trans, |
2730 | struct btrfs_root *root, u64 chunk_offset) | |
8f18cf13 CM |
2731 | { |
2732 | struct extent_map_tree *em_tree; | |
8f18cf13 | 2733 | struct extent_map *em; |
47ab2a6c | 2734 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
8f18cf13 | 2735 | struct map_lookup *map; |
2196d6e8 | 2736 | u64 dev_extent_len = 0; |
47ab2a6c | 2737 | u64 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
47ab2a6c | 2738 | int i, ret = 0; |
8f18cf13 | 2739 | |
47ab2a6c | 2740 | /* Just in case */ |
8f18cf13 | 2741 | root = root->fs_info->chunk_root; |
8f18cf13 CM |
2742 | em_tree = &root->fs_info->mapping_tree.map_tree; |
2743 | ||
890871be | 2744 | read_lock(&em_tree->lock); |
8f18cf13 | 2745 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); |
890871be | 2746 | read_unlock(&em_tree->lock); |
8f18cf13 | 2747 | |
47ab2a6c JB |
2748 | if (!em || em->start > chunk_offset || |
2749 | em->start + em->len < chunk_offset) { | |
2750 | /* | |
2751 | * This is a logic error, but we don't want to just rely on the | |
2752 | * user having built with ASSERT enabled, so if ASSERT doens't | |
2753 | * do anything we still error out. | |
2754 | */ | |
2755 | ASSERT(0); | |
2756 | if (em) | |
2757 | free_extent_map(em); | |
2758 | return -EINVAL; | |
2759 | } | |
8f18cf13 | 2760 | map = (struct map_lookup *)em->bdev; |
39c2d7fa | 2761 | lock_chunks(root->fs_info->chunk_root); |
4617ea3a | 2762 | check_system_chunk(trans, extent_root, map->type); |
39c2d7fa | 2763 | unlock_chunks(root->fs_info->chunk_root); |
8f18cf13 CM |
2764 | |
2765 | for (i = 0; i < map->num_stripes; i++) { | |
47ab2a6c | 2766 | struct btrfs_device *device = map->stripes[i].dev; |
2196d6e8 MX |
2767 | ret = btrfs_free_dev_extent(trans, device, |
2768 | map->stripes[i].physical, | |
2769 | &dev_extent_len); | |
47ab2a6c JB |
2770 | if (ret) { |
2771 | btrfs_abort_transaction(trans, root, ret); | |
2772 | goto out; | |
2773 | } | |
a061fc8d | 2774 | |
2196d6e8 MX |
2775 | if (device->bytes_used > 0) { |
2776 | lock_chunks(root); | |
2777 | btrfs_device_set_bytes_used(device, | |
2778 | device->bytes_used - dev_extent_len); | |
2779 | spin_lock(&root->fs_info->free_chunk_lock); | |
2780 | root->fs_info->free_chunk_space += dev_extent_len; | |
2781 | spin_unlock(&root->fs_info->free_chunk_lock); | |
2782 | btrfs_clear_space_info_full(root->fs_info); | |
2783 | unlock_chunks(root); | |
2784 | } | |
a061fc8d | 2785 | |
dfe25020 CM |
2786 | if (map->stripes[i].dev) { |
2787 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
47ab2a6c JB |
2788 | if (ret) { |
2789 | btrfs_abort_transaction(trans, root, ret); | |
2790 | goto out; | |
2791 | } | |
dfe25020 | 2792 | } |
8f18cf13 | 2793 | } |
a688a04a | 2794 | ret = btrfs_free_chunk(trans, root, chunk_objectid, chunk_offset); |
47ab2a6c JB |
2795 | if (ret) { |
2796 | btrfs_abort_transaction(trans, root, ret); | |
2797 | goto out; | |
2798 | } | |
8f18cf13 | 2799 | |
1abe9b8a | 2800 | trace_btrfs_chunk_free(root, map, chunk_offset, em->len); |
2801 | ||
8f18cf13 CM |
2802 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2803 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
47ab2a6c JB |
2804 | if (ret) { |
2805 | btrfs_abort_transaction(trans, root, ret); | |
2806 | goto out; | |
2807 | } | |
8f18cf13 CM |
2808 | } |
2809 | ||
04216820 | 2810 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset, em); |
47ab2a6c JB |
2811 | if (ret) { |
2812 | btrfs_abort_transaction(trans, extent_root, ret); | |
2813 | goto out; | |
2814 | } | |
2b82032c | 2815 | |
47ab2a6c | 2816 | out: |
2b82032c YZ |
2817 | /* once for us */ |
2818 | free_extent_map(em); | |
47ab2a6c JB |
2819 | return ret; |
2820 | } | |
2b82032c | 2821 | |
dc2ee4e2 | 2822 | static int btrfs_relocate_chunk(struct btrfs_root *root, u64 chunk_offset) |
47ab2a6c JB |
2823 | { |
2824 | struct btrfs_root *extent_root; | |
2825 | struct btrfs_trans_handle *trans; | |
2826 | int ret; | |
2b82032c | 2827 | |
47ab2a6c JB |
2828 | root = root->fs_info->chunk_root; |
2829 | extent_root = root->fs_info->extent_root; | |
2830 | ||
67c5e7d4 FM |
2831 | /* |
2832 | * Prevent races with automatic removal of unused block groups. | |
2833 | * After we relocate and before we remove the chunk with offset | |
2834 | * chunk_offset, automatic removal of the block group can kick in, | |
2835 | * resulting in a failure when calling btrfs_remove_chunk() below. | |
2836 | * | |
2837 | * Make sure to acquire this mutex before doing a tree search (dev | |
2838 | * or chunk trees) to find chunks. Otherwise the cleaner kthread might | |
2839 | * call btrfs_remove_chunk() (through btrfs_delete_unused_bgs()) after | |
2840 | * we release the path used to search the chunk/dev tree and before | |
2841 | * the current task acquires this mutex and calls us. | |
2842 | */ | |
2843 | ASSERT(mutex_is_locked(&root->fs_info->delete_unused_bgs_mutex)); | |
2844 | ||
47ab2a6c JB |
2845 | ret = btrfs_can_relocate(extent_root, chunk_offset); |
2846 | if (ret) | |
2847 | return -ENOSPC; | |
2848 | ||
2849 | /* step one, relocate all the extents inside this chunk */ | |
55e3a601 | 2850 | btrfs_scrub_pause(root); |
47ab2a6c | 2851 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); |
55e3a601 | 2852 | btrfs_scrub_continue(root); |
47ab2a6c JB |
2853 | if (ret) |
2854 | return ret; | |
2855 | ||
2856 | trans = btrfs_start_transaction(root, 0); | |
2857 | if (IS_ERR(trans)) { | |
2858 | ret = PTR_ERR(trans); | |
a4553fef | 2859 | btrfs_std_error(root->fs_info, ret, NULL); |
47ab2a6c JB |
2860 | return ret; |
2861 | } | |
2862 | ||
2863 | /* | |
2864 | * step two, delete the device extents and the | |
2865 | * chunk tree entries | |
2866 | */ | |
2867 | ret = btrfs_remove_chunk(trans, root, chunk_offset); | |
2b82032c | 2868 | btrfs_end_transaction(trans, root); |
47ab2a6c | 2869 | return ret; |
2b82032c YZ |
2870 | } |
2871 | ||
2872 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) | |
2873 | { | |
2874 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; | |
2875 | struct btrfs_path *path; | |
2876 | struct extent_buffer *leaf; | |
2877 | struct btrfs_chunk *chunk; | |
2878 | struct btrfs_key key; | |
2879 | struct btrfs_key found_key; | |
2b82032c | 2880 | u64 chunk_type; |
ba1bf481 JB |
2881 | bool retried = false; |
2882 | int failed = 0; | |
2b82032c YZ |
2883 | int ret; |
2884 | ||
2885 | path = btrfs_alloc_path(); | |
2886 | if (!path) | |
2887 | return -ENOMEM; | |
2888 | ||
ba1bf481 | 2889 | again: |
2b82032c YZ |
2890 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2891 | key.offset = (u64)-1; | |
2892 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2893 | ||
2894 | while (1) { | |
67c5e7d4 | 2895 | mutex_lock(&root->fs_info->delete_unused_bgs_mutex); |
2b82032c | 2896 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
67c5e7d4 FM |
2897 | if (ret < 0) { |
2898 | mutex_unlock(&root->fs_info->delete_unused_bgs_mutex); | |
2b82032c | 2899 | goto error; |
67c5e7d4 | 2900 | } |
79787eaa | 2901 | BUG_ON(ret == 0); /* Corruption */ |
2b82032c YZ |
2902 | |
2903 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
2904 | key.type); | |
67c5e7d4 FM |
2905 | if (ret) |
2906 | mutex_unlock(&root->fs_info->delete_unused_bgs_mutex); | |
2b82032c YZ |
2907 | if (ret < 0) |
2908 | goto error; | |
2909 | if (ret > 0) | |
2910 | break; | |
1a40e23b | 2911 | |
2b82032c YZ |
2912 | leaf = path->nodes[0]; |
2913 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 2914 | |
2b82032c YZ |
2915 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
2916 | struct btrfs_chunk); | |
2917 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
b3b4aa74 | 2918 | btrfs_release_path(path); |
8f18cf13 | 2919 | |
2b82032c | 2920 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
a688a04a | 2921 | ret = btrfs_relocate_chunk(chunk_root, |
2b82032c | 2922 | found_key.offset); |
ba1bf481 JB |
2923 | if (ret == -ENOSPC) |
2924 | failed++; | |
14586651 HS |
2925 | else |
2926 | BUG_ON(ret); | |
2b82032c | 2927 | } |
67c5e7d4 | 2928 | mutex_unlock(&root->fs_info->delete_unused_bgs_mutex); |
8f18cf13 | 2929 | |
2b82032c YZ |
2930 | if (found_key.offset == 0) |
2931 | break; | |
2932 | key.offset = found_key.offset - 1; | |
2933 | } | |
2934 | ret = 0; | |
ba1bf481 JB |
2935 | if (failed && !retried) { |
2936 | failed = 0; | |
2937 | retried = true; | |
2938 | goto again; | |
fae7f21c | 2939 | } else if (WARN_ON(failed && retried)) { |
ba1bf481 JB |
2940 | ret = -ENOSPC; |
2941 | } | |
2b82032c YZ |
2942 | error: |
2943 | btrfs_free_path(path); | |
2944 | return ret; | |
8f18cf13 CM |
2945 | } |
2946 | ||
0940ebf6 ID |
2947 | static int insert_balance_item(struct btrfs_root *root, |
2948 | struct btrfs_balance_control *bctl) | |
2949 | { | |
2950 | struct btrfs_trans_handle *trans; | |
2951 | struct btrfs_balance_item *item; | |
2952 | struct btrfs_disk_balance_args disk_bargs; | |
2953 | struct btrfs_path *path; | |
2954 | struct extent_buffer *leaf; | |
2955 | struct btrfs_key key; | |
2956 | int ret, err; | |
2957 | ||
2958 | path = btrfs_alloc_path(); | |
2959 | if (!path) | |
2960 | return -ENOMEM; | |
2961 | ||
2962 | trans = btrfs_start_transaction(root, 0); | |
2963 | if (IS_ERR(trans)) { | |
2964 | btrfs_free_path(path); | |
2965 | return PTR_ERR(trans); | |
2966 | } | |
2967 | ||
2968 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
2969 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
2970 | key.offset = 0; | |
2971 | ||
2972 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
2973 | sizeof(*item)); | |
2974 | if (ret) | |
2975 | goto out; | |
2976 | ||
2977 | leaf = path->nodes[0]; | |
2978 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
2979 | ||
2980 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
2981 | ||
2982 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data); | |
2983 | btrfs_set_balance_data(leaf, item, &disk_bargs); | |
2984 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->meta); | |
2985 | btrfs_set_balance_meta(leaf, item, &disk_bargs); | |
2986 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->sys); | |
2987 | btrfs_set_balance_sys(leaf, item, &disk_bargs); | |
2988 | ||
2989 | btrfs_set_balance_flags(leaf, item, bctl->flags); | |
2990 | ||
2991 | btrfs_mark_buffer_dirty(leaf); | |
2992 | out: | |
2993 | btrfs_free_path(path); | |
2994 | err = btrfs_commit_transaction(trans, root); | |
2995 | if (err && !ret) | |
2996 | ret = err; | |
2997 | return ret; | |
2998 | } | |
2999 | ||
3000 | static int del_balance_item(struct btrfs_root *root) | |
3001 | { | |
3002 | struct btrfs_trans_handle *trans; | |
3003 | struct btrfs_path *path; | |
3004 | struct btrfs_key key; | |
3005 | int ret, err; | |
3006 | ||
3007 | path = btrfs_alloc_path(); | |
3008 | if (!path) | |
3009 | return -ENOMEM; | |
3010 | ||
3011 | trans = btrfs_start_transaction(root, 0); | |
3012 | if (IS_ERR(trans)) { | |
3013 | btrfs_free_path(path); | |
3014 | return PTR_ERR(trans); | |
3015 | } | |
3016 | ||
3017 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
3018 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
3019 | key.offset = 0; | |
3020 | ||
3021 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
3022 | if (ret < 0) | |
3023 | goto out; | |
3024 | if (ret > 0) { | |
3025 | ret = -ENOENT; | |
3026 | goto out; | |
3027 | } | |
3028 | ||
3029 | ret = btrfs_del_item(trans, root, path); | |
3030 | out: | |
3031 | btrfs_free_path(path); | |
3032 | err = btrfs_commit_transaction(trans, root); | |
3033 | if (err && !ret) | |
3034 | ret = err; | |
3035 | return ret; | |
3036 | } | |
3037 | ||
59641015 ID |
3038 | /* |
3039 | * This is a heuristic used to reduce the number of chunks balanced on | |
3040 | * resume after balance was interrupted. | |
3041 | */ | |
3042 | static void update_balance_args(struct btrfs_balance_control *bctl) | |
3043 | { | |
3044 | /* | |
3045 | * Turn on soft mode for chunk types that were being converted. | |
3046 | */ | |
3047 | if (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
3048 | bctl->data.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
3049 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
3050 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
3051 | if (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
3052 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
3053 | ||
3054 | /* | |
3055 | * Turn on usage filter if is not already used. The idea is | |
3056 | * that chunks that we have already balanced should be | |
3057 | * reasonably full. Don't do it for chunks that are being | |
3058 | * converted - that will keep us from relocating unconverted | |
3059 | * (albeit full) chunks. | |
3060 | */ | |
3061 | if (!(bctl->data.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
3062 | !(bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
3063 | bctl->data.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
3064 | bctl->data.usage = 90; | |
3065 | } | |
3066 | if (!(bctl->sys.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
3067 | !(bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
3068 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
3069 | bctl->sys.usage = 90; | |
3070 | } | |
3071 | if (!(bctl->meta.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
3072 | !(bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
3073 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
3074 | bctl->meta.usage = 90; | |
3075 | } | |
3076 | } | |
3077 | ||
c9e9f97b ID |
3078 | /* |
3079 | * Should be called with both balance and volume mutexes held to | |
3080 | * serialize other volume operations (add_dev/rm_dev/resize) with | |
3081 | * restriper. Same goes for unset_balance_control. | |
3082 | */ | |
3083 | static void set_balance_control(struct btrfs_balance_control *bctl) | |
3084 | { | |
3085 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
3086 | ||
3087 | BUG_ON(fs_info->balance_ctl); | |
3088 | ||
3089 | spin_lock(&fs_info->balance_lock); | |
3090 | fs_info->balance_ctl = bctl; | |
3091 | spin_unlock(&fs_info->balance_lock); | |
3092 | } | |
3093 | ||
3094 | static void unset_balance_control(struct btrfs_fs_info *fs_info) | |
3095 | { | |
3096 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3097 | ||
3098 | BUG_ON(!fs_info->balance_ctl); | |
3099 | ||
3100 | spin_lock(&fs_info->balance_lock); | |
3101 | fs_info->balance_ctl = NULL; | |
3102 | spin_unlock(&fs_info->balance_lock); | |
3103 | ||
3104 | kfree(bctl); | |
3105 | } | |
3106 | ||
ed25e9b2 ID |
3107 | /* |
3108 | * Balance filters. Return 1 if chunk should be filtered out | |
3109 | * (should not be balanced). | |
3110 | */ | |
899c81ea | 3111 | static int chunk_profiles_filter(u64 chunk_type, |
ed25e9b2 ID |
3112 | struct btrfs_balance_args *bargs) |
3113 | { | |
899c81ea ID |
3114 | chunk_type = chunk_to_extended(chunk_type) & |
3115 | BTRFS_EXTENDED_PROFILE_MASK; | |
ed25e9b2 | 3116 | |
899c81ea | 3117 | if (bargs->profiles & chunk_type) |
ed25e9b2 ID |
3118 | return 0; |
3119 | ||
3120 | return 1; | |
3121 | } | |
3122 | ||
5ce5b3c0 ID |
3123 | static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset, |
3124 | struct btrfs_balance_args *bargs) | |
3125 | { | |
3126 | struct btrfs_block_group_cache *cache; | |
3127 | u64 chunk_used, user_thresh; | |
3128 | int ret = 1; | |
3129 | ||
3130 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
3131 | chunk_used = btrfs_block_group_used(&cache->item); | |
3132 | ||
a105bb88 | 3133 | if (bargs->usage == 0) |
3e39cea6 | 3134 | user_thresh = 1; |
a105bb88 ID |
3135 | else if (bargs->usage > 100) |
3136 | user_thresh = cache->key.offset; | |
3137 | else | |
3138 | user_thresh = div_factor_fine(cache->key.offset, | |
3139 | bargs->usage); | |
3140 | ||
5ce5b3c0 ID |
3141 | if (chunk_used < user_thresh) |
3142 | ret = 0; | |
3143 | ||
3144 | btrfs_put_block_group(cache); | |
3145 | return ret; | |
3146 | } | |
3147 | ||
409d404b ID |
3148 | static int chunk_devid_filter(struct extent_buffer *leaf, |
3149 | struct btrfs_chunk *chunk, | |
3150 | struct btrfs_balance_args *bargs) | |
3151 | { | |
3152 | struct btrfs_stripe *stripe; | |
3153 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
3154 | int i; | |
3155 | ||
3156 | for (i = 0; i < num_stripes; i++) { | |
3157 | stripe = btrfs_stripe_nr(chunk, i); | |
3158 | if (btrfs_stripe_devid(leaf, stripe) == bargs->devid) | |
3159 | return 0; | |
3160 | } | |
3161 | ||
3162 | return 1; | |
3163 | } | |
3164 | ||
94e60d5a ID |
3165 | /* [pstart, pend) */ |
3166 | static int chunk_drange_filter(struct extent_buffer *leaf, | |
3167 | struct btrfs_chunk *chunk, | |
3168 | u64 chunk_offset, | |
3169 | struct btrfs_balance_args *bargs) | |
3170 | { | |
3171 | struct btrfs_stripe *stripe; | |
3172 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
3173 | u64 stripe_offset; | |
3174 | u64 stripe_length; | |
3175 | int factor; | |
3176 | int i; | |
3177 | ||
3178 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_DEVID)) | |
3179 | return 0; | |
3180 | ||
3181 | if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP | | |
53b381b3 DW |
3182 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)) { |
3183 | factor = num_stripes / 2; | |
3184 | } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID5) { | |
3185 | factor = num_stripes - 1; | |
3186 | } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID6) { | |
3187 | factor = num_stripes - 2; | |
3188 | } else { | |
3189 | factor = num_stripes; | |
3190 | } | |
94e60d5a ID |
3191 | |
3192 | for (i = 0; i < num_stripes; i++) { | |
3193 | stripe = btrfs_stripe_nr(chunk, i); | |
3194 | if (btrfs_stripe_devid(leaf, stripe) != bargs->devid) | |
3195 | continue; | |
3196 | ||
3197 | stripe_offset = btrfs_stripe_offset(leaf, stripe); | |
3198 | stripe_length = btrfs_chunk_length(leaf, chunk); | |
b8b93add | 3199 | stripe_length = div_u64(stripe_length, factor); |
94e60d5a ID |
3200 | |
3201 | if (stripe_offset < bargs->pend && | |
3202 | stripe_offset + stripe_length > bargs->pstart) | |
3203 | return 0; | |
3204 | } | |
3205 | ||
3206 | return 1; | |
3207 | } | |
3208 | ||
ea67176a ID |
3209 | /* [vstart, vend) */ |
3210 | static int chunk_vrange_filter(struct extent_buffer *leaf, | |
3211 | struct btrfs_chunk *chunk, | |
3212 | u64 chunk_offset, | |
3213 | struct btrfs_balance_args *bargs) | |
3214 | { | |
3215 | if (chunk_offset < bargs->vend && | |
3216 | chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart) | |
3217 | /* at least part of the chunk is inside this vrange */ | |
3218 | return 0; | |
3219 | ||
3220 | return 1; | |
3221 | } | |
3222 | ||
899c81ea | 3223 | static int chunk_soft_convert_filter(u64 chunk_type, |
cfa4c961 ID |
3224 | struct btrfs_balance_args *bargs) |
3225 | { | |
3226 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT)) | |
3227 | return 0; | |
3228 | ||
899c81ea ID |
3229 | chunk_type = chunk_to_extended(chunk_type) & |
3230 | BTRFS_EXTENDED_PROFILE_MASK; | |
cfa4c961 | 3231 | |
899c81ea | 3232 | if (bargs->target == chunk_type) |
cfa4c961 ID |
3233 | return 1; |
3234 | ||
3235 | return 0; | |
3236 | } | |
3237 | ||
f43ffb60 ID |
3238 | static int should_balance_chunk(struct btrfs_root *root, |
3239 | struct extent_buffer *leaf, | |
3240 | struct btrfs_chunk *chunk, u64 chunk_offset) | |
3241 | { | |
3242 | struct btrfs_balance_control *bctl = root->fs_info->balance_ctl; | |
3243 | struct btrfs_balance_args *bargs = NULL; | |
3244 | u64 chunk_type = btrfs_chunk_type(leaf, chunk); | |
3245 | ||
3246 | /* type filter */ | |
3247 | if (!((chunk_type & BTRFS_BLOCK_GROUP_TYPE_MASK) & | |
3248 | (bctl->flags & BTRFS_BALANCE_TYPE_MASK))) { | |
3249 | return 0; | |
3250 | } | |
3251 | ||
3252 | if (chunk_type & BTRFS_BLOCK_GROUP_DATA) | |
3253 | bargs = &bctl->data; | |
3254 | else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) | |
3255 | bargs = &bctl->sys; | |
3256 | else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA) | |
3257 | bargs = &bctl->meta; | |
3258 | ||
ed25e9b2 ID |
3259 | /* profiles filter */ |
3260 | if ((bargs->flags & BTRFS_BALANCE_ARGS_PROFILES) && | |
3261 | chunk_profiles_filter(chunk_type, bargs)) { | |
3262 | return 0; | |
5ce5b3c0 ID |
3263 | } |
3264 | ||
3265 | /* usage filter */ | |
3266 | if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) && | |
3267 | chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) { | |
3268 | return 0; | |
409d404b ID |
3269 | } |
3270 | ||
3271 | /* devid filter */ | |
3272 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DEVID) && | |
3273 | chunk_devid_filter(leaf, chunk, bargs)) { | |
3274 | return 0; | |
94e60d5a ID |
3275 | } |
3276 | ||
3277 | /* drange filter, makes sense only with devid filter */ | |
3278 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) && | |
3279 | chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) { | |
3280 | return 0; | |
ea67176a ID |
3281 | } |
3282 | ||
3283 | /* vrange filter */ | |
3284 | if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) && | |
3285 | chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) { | |
3286 | return 0; | |
ed25e9b2 ID |
3287 | } |
3288 | ||
cfa4c961 ID |
3289 | /* soft profile changing mode */ |
3290 | if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) && | |
3291 | chunk_soft_convert_filter(chunk_type, bargs)) { | |
3292 | return 0; | |
3293 | } | |
3294 | ||
7d824b6f DS |
3295 | /* |
3296 | * limited by count, must be the last filter | |
3297 | */ | |
3298 | if ((bargs->flags & BTRFS_BALANCE_ARGS_LIMIT)) { | |
3299 | if (bargs->limit == 0) | |
3300 | return 0; | |
3301 | else | |
3302 | bargs->limit--; | |
12907fc7 DS |
3303 | } else if ((bargs->flags & BTRFS_BALANCE_ARGS_LIMIT_RANGE)) { |
3304 | /* | |
3305 | * Same logic as the 'limit' filter; the minimum cannot be | |
3306 | * determined here because we do not have the global informatoin | |
3307 | * about the count of all chunks that satisfy the filters. | |
3308 | */ | |
3309 | if (bargs->limit_max == 0) | |
3310 | return 0; | |
3311 | else | |
3312 | bargs->limit_max--; | |
7d824b6f DS |
3313 | } |
3314 | ||
f43ffb60 ID |
3315 | return 1; |
3316 | } | |
3317 | ||
c9e9f97b | 3318 | static int __btrfs_balance(struct btrfs_fs_info *fs_info) |
ec44a35c | 3319 | { |
19a39dce | 3320 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
c9e9f97b ID |
3321 | struct btrfs_root *chunk_root = fs_info->chunk_root; |
3322 | struct btrfs_root *dev_root = fs_info->dev_root; | |
3323 | struct list_head *devices; | |
ec44a35c CM |
3324 | struct btrfs_device *device; |
3325 | u64 old_size; | |
3326 | u64 size_to_free; | |
12907fc7 | 3327 | u64 chunk_type; |
f43ffb60 | 3328 | struct btrfs_chunk *chunk; |
ec44a35c CM |
3329 | struct btrfs_path *path; |
3330 | struct btrfs_key key; | |
ec44a35c | 3331 | struct btrfs_key found_key; |
c9e9f97b | 3332 | struct btrfs_trans_handle *trans; |
f43ffb60 ID |
3333 | struct extent_buffer *leaf; |
3334 | int slot; | |
c9e9f97b ID |
3335 | int ret; |
3336 | int enospc_errors = 0; | |
19a39dce | 3337 | bool counting = true; |
12907fc7 | 3338 | /* The single value limit and min/max limits use the same bytes in the */ |
7d824b6f DS |
3339 | u64 limit_data = bctl->data.limit; |
3340 | u64 limit_meta = bctl->meta.limit; | |
3341 | u64 limit_sys = bctl->sys.limit; | |
12907fc7 DS |
3342 | u32 count_data = 0; |
3343 | u32 count_meta = 0; | |
3344 | u32 count_sys = 0; | |
ec44a35c | 3345 | |
ec44a35c | 3346 | /* step one make some room on all the devices */ |
c9e9f97b | 3347 | devices = &fs_info->fs_devices->devices; |
c6e30871 | 3348 | list_for_each_entry(device, devices, dev_list) { |
7cc8e58d | 3349 | old_size = btrfs_device_get_total_bytes(device); |
ec44a35c CM |
3350 | size_to_free = div_factor(old_size, 1); |
3351 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
2b82032c | 3352 | if (!device->writeable || |
7cc8e58d MX |
3353 | btrfs_device_get_total_bytes(device) - |
3354 | btrfs_device_get_bytes_used(device) > size_to_free || | |
63a212ab | 3355 | device->is_tgtdev_for_dev_replace) |
ec44a35c CM |
3356 | continue; |
3357 | ||
3358 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
ba1bf481 JB |
3359 | if (ret == -ENOSPC) |
3360 | break; | |
ec44a35c CM |
3361 | BUG_ON(ret); |
3362 | ||
a22285a6 | 3363 | trans = btrfs_start_transaction(dev_root, 0); |
98d5dc13 | 3364 | BUG_ON(IS_ERR(trans)); |
ec44a35c CM |
3365 | |
3366 | ret = btrfs_grow_device(trans, device, old_size); | |
3367 | BUG_ON(ret); | |
3368 | ||
3369 | btrfs_end_transaction(trans, dev_root); | |
3370 | } | |
3371 | ||
3372 | /* step two, relocate all the chunks */ | |
3373 | path = btrfs_alloc_path(); | |
17e9f796 MF |
3374 | if (!path) { |
3375 | ret = -ENOMEM; | |
3376 | goto error; | |
3377 | } | |
19a39dce ID |
3378 | |
3379 | /* zero out stat counters */ | |
3380 | spin_lock(&fs_info->balance_lock); | |
3381 | memset(&bctl->stat, 0, sizeof(bctl->stat)); | |
3382 | spin_unlock(&fs_info->balance_lock); | |
3383 | again: | |
7d824b6f | 3384 | if (!counting) { |
12907fc7 DS |
3385 | /* |
3386 | * The single value limit and min/max limits use the same bytes | |
3387 | * in the | |
3388 | */ | |
7d824b6f DS |
3389 | bctl->data.limit = limit_data; |
3390 | bctl->meta.limit = limit_meta; | |
3391 | bctl->sys.limit = limit_sys; | |
3392 | } | |
ec44a35c CM |
3393 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
3394 | key.offset = (u64)-1; | |
3395 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
3396 | ||
d397712b | 3397 | while (1) { |
19a39dce | 3398 | if ((!counting && atomic_read(&fs_info->balance_pause_req)) || |
a7e99c69 | 3399 | atomic_read(&fs_info->balance_cancel_req)) { |
837d5b6e ID |
3400 | ret = -ECANCELED; |
3401 | goto error; | |
3402 | } | |
3403 | ||
67c5e7d4 | 3404 | mutex_lock(&fs_info->delete_unused_bgs_mutex); |
ec44a35c | 3405 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
67c5e7d4 FM |
3406 | if (ret < 0) { |
3407 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
ec44a35c | 3408 | goto error; |
67c5e7d4 | 3409 | } |
ec44a35c CM |
3410 | |
3411 | /* | |
3412 | * this shouldn't happen, it means the last relocate | |
3413 | * failed | |
3414 | */ | |
3415 | if (ret == 0) | |
c9e9f97b | 3416 | BUG(); /* FIXME break ? */ |
ec44a35c CM |
3417 | |
3418 | ret = btrfs_previous_item(chunk_root, path, 0, | |
3419 | BTRFS_CHUNK_ITEM_KEY); | |
c9e9f97b | 3420 | if (ret) { |
67c5e7d4 | 3421 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
c9e9f97b | 3422 | ret = 0; |
ec44a35c | 3423 | break; |
c9e9f97b | 3424 | } |
7d9eb12c | 3425 | |
f43ffb60 ID |
3426 | leaf = path->nodes[0]; |
3427 | slot = path->slots[0]; | |
3428 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
7d9eb12c | 3429 | |
67c5e7d4 FM |
3430 | if (found_key.objectid != key.objectid) { |
3431 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
ec44a35c | 3432 | break; |
67c5e7d4 | 3433 | } |
7d9eb12c | 3434 | |
f43ffb60 | 3435 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); |
12907fc7 | 3436 | chunk_type = btrfs_chunk_type(leaf, chunk); |
f43ffb60 | 3437 | |
19a39dce ID |
3438 | if (!counting) { |
3439 | spin_lock(&fs_info->balance_lock); | |
3440 | bctl->stat.considered++; | |
3441 | spin_unlock(&fs_info->balance_lock); | |
3442 | } | |
3443 | ||
f43ffb60 ID |
3444 | ret = should_balance_chunk(chunk_root, leaf, chunk, |
3445 | found_key.offset); | |
b3b4aa74 | 3446 | btrfs_release_path(path); |
67c5e7d4 FM |
3447 | if (!ret) { |
3448 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
f43ffb60 | 3449 | goto loop; |
67c5e7d4 | 3450 | } |
f43ffb60 | 3451 | |
19a39dce | 3452 | if (counting) { |
67c5e7d4 | 3453 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
19a39dce ID |
3454 | spin_lock(&fs_info->balance_lock); |
3455 | bctl->stat.expected++; | |
3456 | spin_unlock(&fs_info->balance_lock); | |
12907fc7 DS |
3457 | |
3458 | if (chunk_type & BTRFS_BLOCK_GROUP_DATA) | |
3459 | count_data++; | |
3460 | else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) | |
3461 | count_sys++; | |
3462 | else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA) | |
3463 | count_meta++; | |
3464 | ||
3465 | goto loop; | |
3466 | } | |
3467 | ||
3468 | /* | |
3469 | * Apply limit_min filter, no need to check if the LIMITS | |
3470 | * filter is used, limit_min is 0 by default | |
3471 | */ | |
3472 | if (((chunk_type & BTRFS_BLOCK_GROUP_DATA) && | |
3473 | count_data < bctl->data.limit_min) | |
3474 | || ((chunk_type & BTRFS_BLOCK_GROUP_METADATA) && | |
3475 | count_meta < bctl->meta.limit_min) | |
3476 | || ((chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) && | |
3477 | count_sys < bctl->sys.limit_min)) { | |
3478 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); | |
19a39dce ID |
3479 | goto loop; |
3480 | } | |
3481 | ||
ec44a35c | 3482 | ret = btrfs_relocate_chunk(chunk_root, |
ec44a35c | 3483 | found_key.offset); |
67c5e7d4 | 3484 | mutex_unlock(&fs_info->delete_unused_bgs_mutex); |
508794eb JB |
3485 | if (ret && ret != -ENOSPC) |
3486 | goto error; | |
19a39dce | 3487 | if (ret == -ENOSPC) { |
c9e9f97b | 3488 | enospc_errors++; |
19a39dce ID |
3489 | } else { |
3490 | spin_lock(&fs_info->balance_lock); | |
3491 | bctl->stat.completed++; | |
3492 | spin_unlock(&fs_info->balance_lock); | |
3493 | } | |
f43ffb60 | 3494 | loop: |
795a3321 ID |
3495 | if (found_key.offset == 0) |
3496 | break; | |
ba1bf481 | 3497 | key.offset = found_key.offset - 1; |
ec44a35c | 3498 | } |
c9e9f97b | 3499 | |
19a39dce ID |
3500 | if (counting) { |
3501 | btrfs_release_path(path); | |
3502 | counting = false; | |
3503 | goto again; | |
3504 | } | |
ec44a35c CM |
3505 | error: |
3506 | btrfs_free_path(path); | |
c9e9f97b | 3507 | if (enospc_errors) { |
efe120a0 | 3508 | btrfs_info(fs_info, "%d enospc errors during balance", |
c9e9f97b ID |
3509 | enospc_errors); |
3510 | if (!ret) | |
3511 | ret = -ENOSPC; | |
3512 | } | |
3513 | ||
ec44a35c CM |
3514 | return ret; |
3515 | } | |
3516 | ||
0c460c0d ID |
3517 | /** |
3518 | * alloc_profile_is_valid - see if a given profile is valid and reduced | |
3519 | * @flags: profile to validate | |
3520 | * @extended: if true @flags is treated as an extended profile | |
3521 | */ | |
3522 | static int alloc_profile_is_valid(u64 flags, int extended) | |
3523 | { | |
3524 | u64 mask = (extended ? BTRFS_EXTENDED_PROFILE_MASK : | |
3525 | BTRFS_BLOCK_GROUP_PROFILE_MASK); | |
3526 | ||
3527 | flags &= ~BTRFS_BLOCK_GROUP_TYPE_MASK; | |
3528 | ||
3529 | /* 1) check that all other bits are zeroed */ | |
3530 | if (flags & ~mask) | |
3531 | return 0; | |
3532 | ||
3533 | /* 2) see if profile is reduced */ | |
3534 | if (flags == 0) | |
3535 | return !extended; /* "0" is valid for usual profiles */ | |
3536 | ||
3537 | /* true if exactly one bit set */ | |
3538 | return (flags & (flags - 1)) == 0; | |
3539 | } | |
3540 | ||
837d5b6e ID |
3541 | static inline int balance_need_close(struct btrfs_fs_info *fs_info) |
3542 | { | |
a7e99c69 ID |
3543 | /* cancel requested || normal exit path */ |
3544 | return atomic_read(&fs_info->balance_cancel_req) || | |
3545 | (atomic_read(&fs_info->balance_pause_req) == 0 && | |
3546 | atomic_read(&fs_info->balance_cancel_req) == 0); | |
837d5b6e ID |
3547 | } |
3548 | ||
c9e9f97b ID |
3549 | static void __cancel_balance(struct btrfs_fs_info *fs_info) |
3550 | { | |
0940ebf6 ID |
3551 | int ret; |
3552 | ||
c9e9f97b | 3553 | unset_balance_control(fs_info); |
0940ebf6 | 3554 | ret = del_balance_item(fs_info->tree_root); |
0f788c58 | 3555 | if (ret) |
a4553fef | 3556 | btrfs_std_error(fs_info, ret, NULL); |
ed0fb78f ID |
3557 | |
3558 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
c9e9f97b ID |
3559 | } |
3560 | ||
bdcd3c97 AM |
3561 | /* Non-zero return value signifies invalidity */ |
3562 | static inline int validate_convert_profile(struct btrfs_balance_args *bctl_arg, | |
3563 | u64 allowed) | |
3564 | { | |
3565 | return ((bctl_arg->flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3566 | (!alloc_profile_is_valid(bctl_arg->target, 1) || | |
3567 | (bctl_arg->target & ~allowed))); | |
3568 | } | |
3569 | ||
c9e9f97b ID |
3570 | /* |
3571 | * Should be called with both balance and volume mutexes held | |
3572 | */ | |
3573 | int btrfs_balance(struct btrfs_balance_control *bctl, | |
3574 | struct btrfs_ioctl_balance_args *bargs) | |
3575 | { | |
3576 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
f43ffb60 | 3577 | u64 allowed; |
e4837f8f | 3578 | int mixed = 0; |
c9e9f97b | 3579 | int ret; |
8dabb742 | 3580 | u64 num_devices; |
de98ced9 | 3581 | unsigned seq; |
c9e9f97b | 3582 | |
837d5b6e | 3583 | if (btrfs_fs_closing(fs_info) || |
a7e99c69 ID |
3584 | atomic_read(&fs_info->balance_pause_req) || |
3585 | atomic_read(&fs_info->balance_cancel_req)) { | |
c9e9f97b ID |
3586 | ret = -EINVAL; |
3587 | goto out; | |
3588 | } | |
3589 | ||
e4837f8f ID |
3590 | allowed = btrfs_super_incompat_flags(fs_info->super_copy); |
3591 | if (allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
3592 | mixed = 1; | |
3593 | ||
f43ffb60 ID |
3594 | /* |
3595 | * In case of mixed groups both data and meta should be picked, | |
3596 | * and identical options should be given for both of them. | |
3597 | */ | |
e4837f8f ID |
3598 | allowed = BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA; |
3599 | if (mixed && (bctl->flags & allowed)) { | |
f43ffb60 ID |
3600 | if (!(bctl->flags & BTRFS_BALANCE_DATA) || |
3601 | !(bctl->flags & BTRFS_BALANCE_METADATA) || | |
3602 | memcmp(&bctl->data, &bctl->meta, sizeof(bctl->data))) { | |
efe120a0 FH |
3603 | btrfs_err(fs_info, "with mixed groups data and " |
3604 | "metadata balance options must be the same"); | |
f43ffb60 ID |
3605 | ret = -EINVAL; |
3606 | goto out; | |
3607 | } | |
3608 | } | |
3609 | ||
8dabb742 SB |
3610 | num_devices = fs_info->fs_devices->num_devices; |
3611 | btrfs_dev_replace_lock(&fs_info->dev_replace); | |
3612 | if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) { | |
3613 | BUG_ON(num_devices < 1); | |
3614 | num_devices--; | |
3615 | } | |
3616 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
e4d8ec0f | 3617 | allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE; |
8dabb742 | 3618 | if (num_devices == 1) |
e4d8ec0f | 3619 | allowed |= BTRFS_BLOCK_GROUP_DUP; |
8250dabe | 3620 | else if (num_devices > 1) |
e4d8ec0f | 3621 | allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1); |
8250dabe AP |
3622 | if (num_devices > 2) |
3623 | allowed |= BTRFS_BLOCK_GROUP_RAID5; | |
3624 | if (num_devices > 3) | |
3625 | allowed |= (BTRFS_BLOCK_GROUP_RAID10 | | |
3626 | BTRFS_BLOCK_GROUP_RAID6); | |
bdcd3c97 | 3627 | if (validate_convert_profile(&bctl->data, allowed)) { |
efe120a0 FH |
3628 | btrfs_err(fs_info, "unable to start balance with target " |
3629 | "data profile %llu", | |
c1c9ff7c | 3630 | bctl->data.target); |
e4d8ec0f ID |
3631 | ret = -EINVAL; |
3632 | goto out; | |
3633 | } | |
bdcd3c97 | 3634 | if (validate_convert_profile(&bctl->meta, allowed)) { |
efe120a0 FH |
3635 | btrfs_err(fs_info, |
3636 | "unable to start balance with target metadata profile %llu", | |
c1c9ff7c | 3637 | bctl->meta.target); |
e4d8ec0f ID |
3638 | ret = -EINVAL; |
3639 | goto out; | |
3640 | } | |
bdcd3c97 | 3641 | if (validate_convert_profile(&bctl->sys, allowed)) { |
efe120a0 FH |
3642 | btrfs_err(fs_info, |
3643 | "unable to start balance with target system profile %llu", | |
c1c9ff7c | 3644 | bctl->sys.target); |
e4d8ec0f ID |
3645 | ret = -EINVAL; |
3646 | goto out; | |
3647 | } | |
3648 | ||
e4837f8f ID |
3649 | /* allow dup'ed data chunks only in mixed mode */ |
3650 | if (!mixed && (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
6728b198 | 3651 | (bctl->data.target & BTRFS_BLOCK_GROUP_DUP)) { |
efe120a0 | 3652 | btrfs_err(fs_info, "dup for data is not allowed"); |
e4d8ec0f ID |
3653 | ret = -EINVAL; |
3654 | goto out; | |
3655 | } | |
3656 | ||
3657 | /* allow to reduce meta or sys integrity only if force set */ | |
3658 | allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
3659 | BTRFS_BLOCK_GROUP_RAID10 | |
3660 | BTRFS_BLOCK_GROUP_RAID5 | | |
3661 | BTRFS_BLOCK_GROUP_RAID6; | |
de98ced9 MX |
3662 | do { |
3663 | seq = read_seqbegin(&fs_info->profiles_lock); | |
3664 | ||
3665 | if (((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3666 | (fs_info->avail_system_alloc_bits & allowed) && | |
3667 | !(bctl->sys.target & allowed)) || | |
3668 | ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3669 | (fs_info->avail_metadata_alloc_bits & allowed) && | |
3670 | !(bctl->meta.target & allowed))) { | |
3671 | if (bctl->flags & BTRFS_BALANCE_FORCE) { | |
efe120a0 | 3672 | btrfs_info(fs_info, "force reducing metadata integrity"); |
de98ced9 | 3673 | } else { |
efe120a0 FH |
3674 | btrfs_err(fs_info, "balance will reduce metadata " |
3675 | "integrity, use force if you want this"); | |
de98ced9 MX |
3676 | ret = -EINVAL; |
3677 | goto out; | |
3678 | } | |
e4d8ec0f | 3679 | } |
de98ced9 | 3680 | } while (read_seqretry(&fs_info->profiles_lock, seq)); |
e4d8ec0f | 3681 | |
5af3e8cc | 3682 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
943c6e99 ZL |
3683 | fs_info->num_tolerated_disk_barrier_failures = min( |
3684 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info), | |
3685 | btrfs_get_num_tolerated_disk_barrier_failures( | |
3686 | bctl->sys.target)); | |
5af3e8cc SB |
3687 | } |
3688 | ||
0940ebf6 | 3689 | ret = insert_balance_item(fs_info->tree_root, bctl); |
59641015 | 3690 | if (ret && ret != -EEXIST) |
0940ebf6 ID |
3691 | goto out; |
3692 | ||
59641015 ID |
3693 | if (!(bctl->flags & BTRFS_BALANCE_RESUME)) { |
3694 | BUG_ON(ret == -EEXIST); | |
3695 | set_balance_control(bctl); | |
3696 | } else { | |
3697 | BUG_ON(ret != -EEXIST); | |
3698 | spin_lock(&fs_info->balance_lock); | |
3699 | update_balance_args(bctl); | |
3700 | spin_unlock(&fs_info->balance_lock); | |
3701 | } | |
c9e9f97b | 3702 | |
837d5b6e | 3703 | atomic_inc(&fs_info->balance_running); |
c9e9f97b ID |
3704 | mutex_unlock(&fs_info->balance_mutex); |
3705 | ||
3706 | ret = __btrfs_balance(fs_info); | |
3707 | ||
3708 | mutex_lock(&fs_info->balance_mutex); | |
837d5b6e | 3709 | atomic_dec(&fs_info->balance_running); |
c9e9f97b | 3710 | |
bf023ecf ID |
3711 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
3712 | fs_info->num_tolerated_disk_barrier_failures = | |
3713 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); | |
3714 | } | |
3715 | ||
c9e9f97b ID |
3716 | if (bargs) { |
3717 | memset(bargs, 0, sizeof(*bargs)); | |
19a39dce | 3718 | update_ioctl_balance_args(fs_info, 0, bargs); |
c9e9f97b ID |
3719 | } |
3720 | ||
3a01aa7a ID |
3721 | if ((ret && ret != -ECANCELED && ret != -ENOSPC) || |
3722 | balance_need_close(fs_info)) { | |
3723 | __cancel_balance(fs_info); | |
3724 | } | |
3725 | ||
837d5b6e | 3726 | wake_up(&fs_info->balance_wait_q); |
c9e9f97b ID |
3727 | |
3728 | return ret; | |
3729 | out: | |
59641015 ID |
3730 | if (bctl->flags & BTRFS_BALANCE_RESUME) |
3731 | __cancel_balance(fs_info); | |
ed0fb78f | 3732 | else { |
59641015 | 3733 | kfree(bctl); |
ed0fb78f ID |
3734 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); |
3735 | } | |
59641015 ID |
3736 | return ret; |
3737 | } | |
3738 | ||
3739 | static int balance_kthread(void *data) | |
3740 | { | |
2b6ba629 | 3741 | struct btrfs_fs_info *fs_info = data; |
9555c6c1 | 3742 | int ret = 0; |
59641015 ID |
3743 | |
3744 | mutex_lock(&fs_info->volume_mutex); | |
3745 | mutex_lock(&fs_info->balance_mutex); | |
3746 | ||
2b6ba629 | 3747 | if (fs_info->balance_ctl) { |
efe120a0 | 3748 | btrfs_info(fs_info, "continuing balance"); |
2b6ba629 | 3749 | ret = btrfs_balance(fs_info->balance_ctl, NULL); |
9555c6c1 | 3750 | } |
59641015 ID |
3751 | |
3752 | mutex_unlock(&fs_info->balance_mutex); | |
3753 | mutex_unlock(&fs_info->volume_mutex); | |
2b6ba629 | 3754 | |
59641015 ID |
3755 | return ret; |
3756 | } | |
3757 | ||
2b6ba629 ID |
3758 | int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info) |
3759 | { | |
3760 | struct task_struct *tsk; | |
3761 | ||
3762 | spin_lock(&fs_info->balance_lock); | |
3763 | if (!fs_info->balance_ctl) { | |
3764 | spin_unlock(&fs_info->balance_lock); | |
3765 | return 0; | |
3766 | } | |
3767 | spin_unlock(&fs_info->balance_lock); | |
3768 | ||
3769 | if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) { | |
efe120a0 | 3770 | btrfs_info(fs_info, "force skipping balance"); |
2b6ba629 ID |
3771 | return 0; |
3772 | } | |
3773 | ||
3774 | tsk = kthread_run(balance_kthread, fs_info, "btrfs-balance"); | |
cd633972 | 3775 | return PTR_ERR_OR_ZERO(tsk); |
2b6ba629 ID |
3776 | } |
3777 | ||
68310a5e | 3778 | int btrfs_recover_balance(struct btrfs_fs_info *fs_info) |
59641015 | 3779 | { |
59641015 ID |
3780 | struct btrfs_balance_control *bctl; |
3781 | struct btrfs_balance_item *item; | |
3782 | struct btrfs_disk_balance_args disk_bargs; | |
3783 | struct btrfs_path *path; | |
3784 | struct extent_buffer *leaf; | |
3785 | struct btrfs_key key; | |
3786 | int ret; | |
3787 | ||
3788 | path = btrfs_alloc_path(); | |
3789 | if (!path) | |
3790 | return -ENOMEM; | |
3791 | ||
59641015 ID |
3792 | key.objectid = BTRFS_BALANCE_OBJECTID; |
3793 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
3794 | key.offset = 0; | |
3795 | ||
68310a5e | 3796 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
59641015 | 3797 | if (ret < 0) |
68310a5e | 3798 | goto out; |
59641015 ID |
3799 | if (ret > 0) { /* ret = -ENOENT; */ |
3800 | ret = 0; | |
68310a5e ID |
3801 | goto out; |
3802 | } | |
3803 | ||
3804 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); | |
3805 | if (!bctl) { | |
3806 | ret = -ENOMEM; | |
3807 | goto out; | |
59641015 ID |
3808 | } |
3809 | ||
3810 | leaf = path->nodes[0]; | |
3811 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
3812 | ||
68310a5e ID |
3813 | bctl->fs_info = fs_info; |
3814 | bctl->flags = btrfs_balance_flags(leaf, item); | |
3815 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
59641015 ID |
3816 | |
3817 | btrfs_balance_data(leaf, item, &disk_bargs); | |
3818 | btrfs_disk_balance_args_to_cpu(&bctl->data, &disk_bargs); | |
3819 | btrfs_balance_meta(leaf, item, &disk_bargs); | |
3820 | btrfs_disk_balance_args_to_cpu(&bctl->meta, &disk_bargs); | |
3821 | btrfs_balance_sys(leaf, item, &disk_bargs); | |
3822 | btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs); | |
3823 | ||
ed0fb78f ID |
3824 | WARN_ON(atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)); |
3825 | ||
68310a5e ID |
3826 | mutex_lock(&fs_info->volume_mutex); |
3827 | mutex_lock(&fs_info->balance_mutex); | |
59641015 | 3828 | |
68310a5e ID |
3829 | set_balance_control(bctl); |
3830 | ||
3831 | mutex_unlock(&fs_info->balance_mutex); | |
3832 | mutex_unlock(&fs_info->volume_mutex); | |
59641015 ID |
3833 | out: |
3834 | btrfs_free_path(path); | |
ec44a35c CM |
3835 | return ret; |
3836 | } | |
3837 | ||
837d5b6e ID |
3838 | int btrfs_pause_balance(struct btrfs_fs_info *fs_info) |
3839 | { | |
3840 | int ret = 0; | |
3841 | ||
3842 | mutex_lock(&fs_info->balance_mutex); | |
3843 | if (!fs_info->balance_ctl) { | |
3844 | mutex_unlock(&fs_info->balance_mutex); | |
3845 | return -ENOTCONN; | |
3846 | } | |
3847 | ||
3848 | if (atomic_read(&fs_info->balance_running)) { | |
3849 | atomic_inc(&fs_info->balance_pause_req); | |
3850 | mutex_unlock(&fs_info->balance_mutex); | |
3851 | ||
3852 | wait_event(fs_info->balance_wait_q, | |
3853 | atomic_read(&fs_info->balance_running) == 0); | |
3854 | ||
3855 | mutex_lock(&fs_info->balance_mutex); | |
3856 | /* we are good with balance_ctl ripped off from under us */ | |
3857 | BUG_ON(atomic_read(&fs_info->balance_running)); | |
3858 | atomic_dec(&fs_info->balance_pause_req); | |
3859 | } else { | |
3860 | ret = -ENOTCONN; | |
3861 | } | |
3862 | ||
3863 | mutex_unlock(&fs_info->balance_mutex); | |
3864 | return ret; | |
3865 | } | |
3866 | ||
a7e99c69 ID |
3867 | int btrfs_cancel_balance(struct btrfs_fs_info *fs_info) |
3868 | { | |
e649e587 ID |
3869 | if (fs_info->sb->s_flags & MS_RDONLY) |
3870 | return -EROFS; | |
3871 | ||
a7e99c69 ID |
3872 | mutex_lock(&fs_info->balance_mutex); |
3873 | if (!fs_info->balance_ctl) { | |
3874 | mutex_unlock(&fs_info->balance_mutex); | |
3875 | return -ENOTCONN; | |
3876 | } | |
3877 | ||
3878 | atomic_inc(&fs_info->balance_cancel_req); | |
3879 | /* | |
3880 | * if we are running just wait and return, balance item is | |
3881 | * deleted in btrfs_balance in this case | |
3882 | */ | |
3883 | if (atomic_read(&fs_info->balance_running)) { | |
3884 | mutex_unlock(&fs_info->balance_mutex); | |
3885 | wait_event(fs_info->balance_wait_q, | |
3886 | atomic_read(&fs_info->balance_running) == 0); | |
3887 | mutex_lock(&fs_info->balance_mutex); | |
3888 | } else { | |
3889 | /* __cancel_balance needs volume_mutex */ | |
3890 | mutex_unlock(&fs_info->balance_mutex); | |
3891 | mutex_lock(&fs_info->volume_mutex); | |
3892 | mutex_lock(&fs_info->balance_mutex); | |
3893 | ||
3894 | if (fs_info->balance_ctl) | |
3895 | __cancel_balance(fs_info); | |
3896 | ||
3897 | mutex_unlock(&fs_info->volume_mutex); | |
3898 | } | |
3899 | ||
3900 | BUG_ON(fs_info->balance_ctl || atomic_read(&fs_info->balance_running)); | |
3901 | atomic_dec(&fs_info->balance_cancel_req); | |
3902 | mutex_unlock(&fs_info->balance_mutex); | |
3903 | return 0; | |
3904 | } | |
3905 | ||
803b2f54 SB |
3906 | static int btrfs_uuid_scan_kthread(void *data) |
3907 | { | |
3908 | struct btrfs_fs_info *fs_info = data; | |
3909 | struct btrfs_root *root = fs_info->tree_root; | |
3910 | struct btrfs_key key; | |
3911 | struct btrfs_key max_key; | |
3912 | struct btrfs_path *path = NULL; | |
3913 | int ret = 0; | |
3914 | struct extent_buffer *eb; | |
3915 | int slot; | |
3916 | struct btrfs_root_item root_item; | |
3917 | u32 item_size; | |
f45388f3 | 3918 | struct btrfs_trans_handle *trans = NULL; |
803b2f54 SB |
3919 | |
3920 | path = btrfs_alloc_path(); | |
3921 | if (!path) { | |
3922 | ret = -ENOMEM; | |
3923 | goto out; | |
3924 | } | |
3925 | ||
3926 | key.objectid = 0; | |
3927 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3928 | key.offset = 0; | |
3929 | ||
3930 | max_key.objectid = (u64)-1; | |
3931 | max_key.type = BTRFS_ROOT_ITEM_KEY; | |
3932 | max_key.offset = (u64)-1; | |
3933 | ||
803b2f54 | 3934 | while (1) { |
6174d3cb | 3935 | ret = btrfs_search_forward(root, &key, path, 0); |
803b2f54 SB |
3936 | if (ret) { |
3937 | if (ret > 0) | |
3938 | ret = 0; | |
3939 | break; | |
3940 | } | |
3941 | ||
3942 | if (key.type != BTRFS_ROOT_ITEM_KEY || | |
3943 | (key.objectid < BTRFS_FIRST_FREE_OBJECTID && | |
3944 | key.objectid != BTRFS_FS_TREE_OBJECTID) || | |
3945 | key.objectid > BTRFS_LAST_FREE_OBJECTID) | |
3946 | goto skip; | |
3947 | ||
3948 | eb = path->nodes[0]; | |
3949 | slot = path->slots[0]; | |
3950 | item_size = btrfs_item_size_nr(eb, slot); | |
3951 | if (item_size < sizeof(root_item)) | |
3952 | goto skip; | |
3953 | ||
803b2f54 SB |
3954 | read_extent_buffer(eb, &root_item, |
3955 | btrfs_item_ptr_offset(eb, slot), | |
3956 | (int)sizeof(root_item)); | |
3957 | if (btrfs_root_refs(&root_item) == 0) | |
3958 | goto skip; | |
f45388f3 FDBM |
3959 | |
3960 | if (!btrfs_is_empty_uuid(root_item.uuid) || | |
3961 | !btrfs_is_empty_uuid(root_item.received_uuid)) { | |
3962 | if (trans) | |
3963 | goto update_tree; | |
3964 | ||
3965 | btrfs_release_path(path); | |
803b2f54 SB |
3966 | /* |
3967 | * 1 - subvol uuid item | |
3968 | * 1 - received_subvol uuid item | |
3969 | */ | |
3970 | trans = btrfs_start_transaction(fs_info->uuid_root, 2); | |
3971 | if (IS_ERR(trans)) { | |
3972 | ret = PTR_ERR(trans); | |
3973 | break; | |
3974 | } | |
f45388f3 FDBM |
3975 | continue; |
3976 | } else { | |
3977 | goto skip; | |
3978 | } | |
3979 | update_tree: | |
3980 | if (!btrfs_is_empty_uuid(root_item.uuid)) { | |
803b2f54 SB |
3981 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, |
3982 | root_item.uuid, | |
3983 | BTRFS_UUID_KEY_SUBVOL, | |
3984 | key.objectid); | |
3985 | if (ret < 0) { | |
efe120a0 | 3986 | btrfs_warn(fs_info, "uuid_tree_add failed %d", |
803b2f54 | 3987 | ret); |
803b2f54 SB |
3988 | break; |
3989 | } | |
3990 | } | |
3991 | ||
3992 | if (!btrfs_is_empty_uuid(root_item.received_uuid)) { | |
803b2f54 SB |
3993 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, |
3994 | root_item.received_uuid, | |
3995 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
3996 | key.objectid); | |
3997 | if (ret < 0) { | |
efe120a0 | 3998 | btrfs_warn(fs_info, "uuid_tree_add failed %d", |
803b2f54 | 3999 | ret); |
803b2f54 SB |
4000 | break; |
4001 | } | |
4002 | } | |
4003 | ||
f45388f3 | 4004 | skip: |
803b2f54 SB |
4005 | if (trans) { |
4006 | ret = btrfs_end_transaction(trans, fs_info->uuid_root); | |
f45388f3 | 4007 | trans = NULL; |
803b2f54 SB |
4008 | if (ret) |
4009 | break; | |
4010 | } | |
4011 | ||
803b2f54 SB |
4012 | btrfs_release_path(path); |
4013 | if (key.offset < (u64)-1) { | |
4014 | key.offset++; | |
4015 | } else if (key.type < BTRFS_ROOT_ITEM_KEY) { | |
4016 | key.offset = 0; | |
4017 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4018 | } else if (key.objectid < (u64)-1) { | |
4019 | key.offset = 0; | |
4020 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4021 | key.objectid++; | |
4022 | } else { | |
4023 | break; | |
4024 | } | |
4025 | cond_resched(); | |
4026 | } | |
4027 | ||
4028 | out: | |
4029 | btrfs_free_path(path); | |
f45388f3 FDBM |
4030 | if (trans && !IS_ERR(trans)) |
4031 | btrfs_end_transaction(trans, fs_info->uuid_root); | |
803b2f54 | 4032 | if (ret) |
efe120a0 | 4033 | btrfs_warn(fs_info, "btrfs_uuid_scan_kthread failed %d", ret); |
70f80175 SB |
4034 | else |
4035 | fs_info->update_uuid_tree_gen = 1; | |
803b2f54 SB |
4036 | up(&fs_info->uuid_tree_rescan_sem); |
4037 | return 0; | |
4038 | } | |
4039 | ||
70f80175 SB |
4040 | /* |
4041 | * Callback for btrfs_uuid_tree_iterate(). | |
4042 | * returns: | |
4043 | * 0 check succeeded, the entry is not outdated. | |
4044 | * < 0 if an error occured. | |
4045 | * > 0 if the check failed, which means the caller shall remove the entry. | |
4046 | */ | |
4047 | static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info, | |
4048 | u8 *uuid, u8 type, u64 subid) | |
4049 | { | |
4050 | struct btrfs_key key; | |
4051 | int ret = 0; | |
4052 | struct btrfs_root *subvol_root; | |
4053 | ||
4054 | if (type != BTRFS_UUID_KEY_SUBVOL && | |
4055 | type != BTRFS_UUID_KEY_RECEIVED_SUBVOL) | |
4056 | goto out; | |
4057 | ||
4058 | key.objectid = subid; | |
4059 | key.type = BTRFS_ROOT_ITEM_KEY; | |
4060 | key.offset = (u64)-1; | |
4061 | subvol_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
4062 | if (IS_ERR(subvol_root)) { | |
4063 | ret = PTR_ERR(subvol_root); | |
4064 | if (ret == -ENOENT) | |
4065 | ret = 1; | |
4066 | goto out; | |
4067 | } | |
4068 | ||
4069 | switch (type) { | |
4070 | case BTRFS_UUID_KEY_SUBVOL: | |
4071 | if (memcmp(uuid, subvol_root->root_item.uuid, BTRFS_UUID_SIZE)) | |
4072 | ret = 1; | |
4073 | break; | |
4074 | case BTRFS_UUID_KEY_RECEIVED_SUBVOL: | |
4075 | if (memcmp(uuid, subvol_root->root_item.received_uuid, | |
4076 | BTRFS_UUID_SIZE)) | |
4077 | ret = 1; | |
4078 | break; | |
4079 | } | |
4080 | ||
4081 | out: | |
4082 | return ret; | |
4083 | } | |
4084 | ||
4085 | static int btrfs_uuid_rescan_kthread(void *data) | |
4086 | { | |
4087 | struct btrfs_fs_info *fs_info = (struct btrfs_fs_info *)data; | |
4088 | int ret; | |
4089 | ||
4090 | /* | |
4091 | * 1st step is to iterate through the existing UUID tree and | |
4092 | * to delete all entries that contain outdated data. | |
4093 | * 2nd step is to add all missing entries to the UUID tree. | |
4094 | */ | |
4095 | ret = btrfs_uuid_tree_iterate(fs_info, btrfs_check_uuid_tree_entry); | |
4096 | if (ret < 0) { | |
efe120a0 | 4097 | btrfs_warn(fs_info, "iterating uuid_tree failed %d", ret); |
70f80175 SB |
4098 | up(&fs_info->uuid_tree_rescan_sem); |
4099 | return ret; | |
4100 | } | |
4101 | return btrfs_uuid_scan_kthread(data); | |
4102 | } | |
4103 | ||
f7a81ea4 SB |
4104 | int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info) |
4105 | { | |
4106 | struct btrfs_trans_handle *trans; | |
4107 | struct btrfs_root *tree_root = fs_info->tree_root; | |
4108 | struct btrfs_root *uuid_root; | |
803b2f54 SB |
4109 | struct task_struct *task; |
4110 | int ret; | |
f7a81ea4 SB |
4111 | |
4112 | /* | |
4113 | * 1 - root node | |
4114 | * 1 - root item | |
4115 | */ | |
4116 | trans = btrfs_start_transaction(tree_root, 2); | |
4117 | if (IS_ERR(trans)) | |
4118 | return PTR_ERR(trans); | |
4119 | ||
4120 | uuid_root = btrfs_create_tree(trans, fs_info, | |
4121 | BTRFS_UUID_TREE_OBJECTID); | |
4122 | if (IS_ERR(uuid_root)) { | |
6d13f549 DS |
4123 | ret = PTR_ERR(uuid_root); |
4124 | btrfs_abort_transaction(trans, tree_root, ret); | |
4125 | return ret; | |
f7a81ea4 SB |
4126 | } |
4127 | ||
4128 | fs_info->uuid_root = uuid_root; | |
4129 | ||
803b2f54 SB |
4130 | ret = btrfs_commit_transaction(trans, tree_root); |
4131 | if (ret) | |
4132 | return ret; | |
4133 | ||
4134 | down(&fs_info->uuid_tree_rescan_sem); | |
4135 | task = kthread_run(btrfs_uuid_scan_kthread, fs_info, "btrfs-uuid"); | |
4136 | if (IS_ERR(task)) { | |
70f80175 | 4137 | /* fs_info->update_uuid_tree_gen remains 0 in all error case */ |
efe120a0 | 4138 | btrfs_warn(fs_info, "failed to start uuid_scan task"); |
803b2f54 SB |
4139 | up(&fs_info->uuid_tree_rescan_sem); |
4140 | return PTR_ERR(task); | |
4141 | } | |
4142 | ||
4143 | return 0; | |
f7a81ea4 | 4144 | } |
803b2f54 | 4145 | |
70f80175 SB |
4146 | int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info) |
4147 | { | |
4148 | struct task_struct *task; | |
4149 | ||
4150 | down(&fs_info->uuid_tree_rescan_sem); | |
4151 | task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid"); | |
4152 | if (IS_ERR(task)) { | |
4153 | /* fs_info->update_uuid_tree_gen remains 0 in all error case */ | |
efe120a0 | 4154 | btrfs_warn(fs_info, "failed to start uuid_rescan task"); |
70f80175 SB |
4155 | up(&fs_info->uuid_tree_rescan_sem); |
4156 | return PTR_ERR(task); | |
4157 | } | |
4158 | ||
4159 | return 0; | |
4160 | } | |
4161 | ||
8f18cf13 CM |
4162 | /* |
4163 | * shrinking a device means finding all of the device extents past | |
4164 | * the new size, and then following the back refs to the chunks. | |
4165 | * The chunk relocation code actually frees the device extent | |
4166 | */ | |
4167 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
4168 | { | |
4169 | struct btrfs_trans_handle *trans; | |
4170 | struct btrfs_root *root = device->dev_root; | |
4171 | struct btrfs_dev_extent *dev_extent = NULL; | |
4172 | struct btrfs_path *path; | |
4173 | u64 length; | |
8f18cf13 CM |
4174 | u64 chunk_offset; |
4175 | int ret; | |
4176 | int slot; | |
ba1bf481 JB |
4177 | int failed = 0; |
4178 | bool retried = false; | |
53e489bc | 4179 | bool checked_pending_chunks = false; |
8f18cf13 CM |
4180 | struct extent_buffer *l; |
4181 | struct btrfs_key key; | |
6c41761f | 4182 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 | 4183 | u64 old_total = btrfs_super_total_bytes(super_copy); |
7cc8e58d MX |
4184 | u64 old_size = btrfs_device_get_total_bytes(device); |
4185 | u64 diff = old_size - new_size; | |
8f18cf13 | 4186 | |
63a212ab SB |
4187 | if (device->is_tgtdev_for_dev_replace) |
4188 | return -EINVAL; | |
4189 | ||
8f18cf13 CM |
4190 | path = btrfs_alloc_path(); |
4191 | if (!path) | |
4192 | return -ENOMEM; | |
4193 | ||
8f18cf13 CM |
4194 | path->reada = 2; |
4195 | ||
7d9eb12c CM |
4196 | lock_chunks(root); |
4197 | ||
7cc8e58d | 4198 | btrfs_device_set_total_bytes(device, new_size); |
2bf64758 | 4199 | if (device->writeable) { |
2b82032c | 4200 | device->fs_devices->total_rw_bytes -= diff; |
2bf64758 JB |
4201 | spin_lock(&root->fs_info->free_chunk_lock); |
4202 | root->fs_info->free_chunk_space -= diff; | |
4203 | spin_unlock(&root->fs_info->free_chunk_lock); | |
4204 | } | |
7d9eb12c | 4205 | unlock_chunks(root); |
8f18cf13 | 4206 | |
ba1bf481 | 4207 | again: |
8f18cf13 CM |
4208 | key.objectid = device->devid; |
4209 | key.offset = (u64)-1; | |
4210 | key.type = BTRFS_DEV_EXTENT_KEY; | |
4211 | ||
213e64da | 4212 | do { |
67c5e7d4 | 4213 | mutex_lock(&root->fs_info->delete_unused_bgs_mutex); |
8f18cf13 | 4214 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
67c5e7d4 FM |
4215 | if (ret < 0) { |
4216 | mutex_unlock(&root->fs_info->delete_unused_bgs_mutex); | |
8f18cf13 | 4217 | goto done; |
67c5e7d4 | 4218 | } |
8f18cf13 CM |
4219 | |
4220 | ret = btrfs_previous_item(root, path, 0, key.type); | |
67c5e7d4 FM |
4221 | if (ret) |
4222 | mutex_unlock(&root->fs_info->delete_unused_bgs_mutex); | |
8f18cf13 CM |
4223 | if (ret < 0) |
4224 | goto done; | |
4225 | if (ret) { | |
4226 | ret = 0; | |
b3b4aa74 | 4227 | btrfs_release_path(path); |
bf1fb512 | 4228 | break; |
8f18cf13 CM |
4229 | } |
4230 | ||
4231 | l = path->nodes[0]; | |
4232 | slot = path->slots[0]; | |
4233 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
4234 | ||
ba1bf481 | 4235 | if (key.objectid != device->devid) { |
67c5e7d4 | 4236 | mutex_unlock(&root->fs_info->delete_unused_bgs_mutex); |
b3b4aa74 | 4237 | btrfs_release_path(path); |
bf1fb512 | 4238 | break; |
ba1bf481 | 4239 | } |
8f18cf13 CM |
4240 | |
4241 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
4242 | length = btrfs_dev_extent_length(l, dev_extent); | |
4243 | ||
ba1bf481 | 4244 | if (key.offset + length <= new_size) { |
67c5e7d4 | 4245 | mutex_unlock(&root->fs_info->delete_unused_bgs_mutex); |
b3b4aa74 | 4246 | btrfs_release_path(path); |
d6397bae | 4247 | break; |
ba1bf481 | 4248 | } |
8f18cf13 | 4249 | |
8f18cf13 | 4250 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
b3b4aa74 | 4251 | btrfs_release_path(path); |
8f18cf13 | 4252 | |
dc2ee4e2 | 4253 | ret = btrfs_relocate_chunk(root, chunk_offset); |
67c5e7d4 | 4254 | mutex_unlock(&root->fs_info->delete_unused_bgs_mutex); |
ba1bf481 | 4255 | if (ret && ret != -ENOSPC) |
8f18cf13 | 4256 | goto done; |
ba1bf481 JB |
4257 | if (ret == -ENOSPC) |
4258 | failed++; | |
213e64da | 4259 | } while (key.offset-- > 0); |
ba1bf481 JB |
4260 | |
4261 | if (failed && !retried) { | |
4262 | failed = 0; | |
4263 | retried = true; | |
4264 | goto again; | |
4265 | } else if (failed && retried) { | |
4266 | ret = -ENOSPC; | |
ba1bf481 | 4267 | goto done; |
8f18cf13 CM |
4268 | } |
4269 | ||
d6397bae | 4270 | /* Shrinking succeeded, else we would be at "done". */ |
a22285a6 | 4271 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
4272 | if (IS_ERR(trans)) { |
4273 | ret = PTR_ERR(trans); | |
4274 | goto done; | |
4275 | } | |
4276 | ||
d6397bae | 4277 | lock_chunks(root); |
53e489bc FM |
4278 | |
4279 | /* | |
4280 | * We checked in the above loop all device extents that were already in | |
4281 | * the device tree. However before we have updated the device's | |
4282 | * total_bytes to the new size, we might have had chunk allocations that | |
4283 | * have not complete yet (new block groups attached to transaction | |
4284 | * handles), and therefore their device extents were not yet in the | |
4285 | * device tree and we missed them in the loop above. So if we have any | |
4286 | * pending chunk using a device extent that overlaps the device range | |
4287 | * that we can not use anymore, commit the current transaction and | |
4288 | * repeat the search on the device tree - this way we guarantee we will | |
4289 | * not have chunks using device extents that end beyond 'new_size'. | |
4290 | */ | |
4291 | if (!checked_pending_chunks) { | |
4292 | u64 start = new_size; | |
4293 | u64 len = old_size - new_size; | |
4294 | ||
499f377f JM |
4295 | if (contains_pending_extent(trans->transaction, device, |
4296 | &start, len)) { | |
53e489bc FM |
4297 | unlock_chunks(root); |
4298 | checked_pending_chunks = true; | |
4299 | failed = 0; | |
4300 | retried = false; | |
4301 | ret = btrfs_commit_transaction(trans, root); | |
4302 | if (ret) | |
4303 | goto done; | |
4304 | goto again; | |
4305 | } | |
4306 | } | |
4307 | ||
7cc8e58d | 4308 | btrfs_device_set_disk_total_bytes(device, new_size); |
935e5cc9 MX |
4309 | if (list_empty(&device->resized_list)) |
4310 | list_add_tail(&device->resized_list, | |
4311 | &root->fs_info->fs_devices->resized_devices); | |
d6397bae | 4312 | |
d6397bae CB |
4313 | WARN_ON(diff > old_total); |
4314 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
4315 | unlock_chunks(root); | |
2196d6e8 MX |
4316 | |
4317 | /* Now btrfs_update_device() will change the on-disk size. */ | |
4318 | ret = btrfs_update_device(trans, device); | |
d6397bae | 4319 | btrfs_end_transaction(trans, root); |
8f18cf13 CM |
4320 | done: |
4321 | btrfs_free_path(path); | |
53e489bc FM |
4322 | if (ret) { |
4323 | lock_chunks(root); | |
4324 | btrfs_device_set_total_bytes(device, old_size); | |
4325 | if (device->writeable) | |
4326 | device->fs_devices->total_rw_bytes += diff; | |
4327 | spin_lock(&root->fs_info->free_chunk_lock); | |
4328 | root->fs_info->free_chunk_space += diff; | |
4329 | spin_unlock(&root->fs_info->free_chunk_lock); | |
4330 | unlock_chunks(root); | |
4331 | } | |
8f18cf13 CM |
4332 | return ret; |
4333 | } | |
4334 | ||
125ccb0a | 4335 | static int btrfs_add_system_chunk(struct btrfs_root *root, |
0b86a832 CM |
4336 | struct btrfs_key *key, |
4337 | struct btrfs_chunk *chunk, int item_size) | |
4338 | { | |
6c41761f | 4339 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
0b86a832 CM |
4340 | struct btrfs_disk_key disk_key; |
4341 | u32 array_size; | |
4342 | u8 *ptr; | |
4343 | ||
fe48a5c0 | 4344 | lock_chunks(root); |
0b86a832 | 4345 | array_size = btrfs_super_sys_array_size(super_copy); |
5f43f86e | 4346 | if (array_size + item_size + sizeof(disk_key) |
fe48a5c0 MX |
4347 | > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) { |
4348 | unlock_chunks(root); | |
0b86a832 | 4349 | return -EFBIG; |
fe48a5c0 | 4350 | } |
0b86a832 CM |
4351 | |
4352 | ptr = super_copy->sys_chunk_array + array_size; | |
4353 | btrfs_cpu_key_to_disk(&disk_key, key); | |
4354 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
4355 | ptr += sizeof(disk_key); | |
4356 | memcpy(ptr, chunk, item_size); | |
4357 | item_size += sizeof(disk_key); | |
4358 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
fe48a5c0 MX |
4359 | unlock_chunks(root); |
4360 | ||
0b86a832 CM |
4361 | return 0; |
4362 | } | |
4363 | ||
73c5de00 AJ |
4364 | /* |
4365 | * sort the devices in descending order by max_avail, total_avail | |
4366 | */ | |
4367 | static int btrfs_cmp_device_info(const void *a, const void *b) | |
9b3f68b9 | 4368 | { |
73c5de00 AJ |
4369 | const struct btrfs_device_info *di_a = a; |
4370 | const struct btrfs_device_info *di_b = b; | |
9b3f68b9 | 4371 | |
73c5de00 | 4372 | if (di_a->max_avail > di_b->max_avail) |
b2117a39 | 4373 | return -1; |
73c5de00 | 4374 | if (di_a->max_avail < di_b->max_avail) |
b2117a39 | 4375 | return 1; |
73c5de00 AJ |
4376 | if (di_a->total_avail > di_b->total_avail) |
4377 | return -1; | |
4378 | if (di_a->total_avail < di_b->total_avail) | |
4379 | return 1; | |
4380 | return 0; | |
b2117a39 | 4381 | } |
0b86a832 | 4382 | |
53b381b3 DW |
4383 | static u32 find_raid56_stripe_len(u32 data_devices, u32 dev_stripe_target) |
4384 | { | |
4385 | /* TODO allow them to set a preferred stripe size */ | |
4386 | return 64 * 1024; | |
4387 | } | |
4388 | ||
4389 | static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type) | |
4390 | { | |
ffe2d203 | 4391 | if (!(type & BTRFS_BLOCK_GROUP_RAID56_MASK)) |
53b381b3 DW |
4392 | return; |
4393 | ||
ceda0864 | 4394 | btrfs_set_fs_incompat(info, RAID56); |
53b381b3 DW |
4395 | } |
4396 | ||
23f8f9b7 GH |
4397 | #define BTRFS_MAX_DEVS(r) ((BTRFS_LEAF_DATA_SIZE(r) \ |
4398 | - sizeof(struct btrfs_item) \ | |
4399 | - sizeof(struct btrfs_chunk)) \ | |
4400 | / sizeof(struct btrfs_stripe) + 1) | |
4401 | ||
4402 | #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \ | |
4403 | - 2 * sizeof(struct btrfs_disk_key) \ | |
4404 | - 2 * sizeof(struct btrfs_chunk)) \ | |
4405 | / sizeof(struct btrfs_stripe) + 1) | |
4406 | ||
73c5de00 | 4407 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
6df9a95e JB |
4408 | struct btrfs_root *extent_root, u64 start, |
4409 | u64 type) | |
b2117a39 | 4410 | { |
73c5de00 AJ |
4411 | struct btrfs_fs_info *info = extent_root->fs_info; |
4412 | struct btrfs_fs_devices *fs_devices = info->fs_devices; | |
4413 | struct list_head *cur; | |
4414 | struct map_lookup *map = NULL; | |
4415 | struct extent_map_tree *em_tree; | |
4416 | struct extent_map *em; | |
4417 | struct btrfs_device_info *devices_info = NULL; | |
4418 | u64 total_avail; | |
4419 | int num_stripes; /* total number of stripes to allocate */ | |
53b381b3 DW |
4420 | int data_stripes; /* number of stripes that count for |
4421 | block group size */ | |
73c5de00 AJ |
4422 | int sub_stripes; /* sub_stripes info for map */ |
4423 | int dev_stripes; /* stripes per dev */ | |
4424 | int devs_max; /* max devs to use */ | |
4425 | int devs_min; /* min devs needed */ | |
4426 | int devs_increment; /* ndevs has to be a multiple of this */ | |
4427 | int ncopies; /* how many copies to data has */ | |
4428 | int ret; | |
4429 | u64 max_stripe_size; | |
4430 | u64 max_chunk_size; | |
4431 | u64 stripe_size; | |
4432 | u64 num_bytes; | |
53b381b3 | 4433 | u64 raid_stripe_len = BTRFS_STRIPE_LEN; |
73c5de00 AJ |
4434 | int ndevs; |
4435 | int i; | |
4436 | int j; | |
31e50229 | 4437 | int index; |
593060d7 | 4438 | |
0c460c0d | 4439 | BUG_ON(!alloc_profile_is_valid(type, 0)); |
9b3f68b9 | 4440 | |
73c5de00 AJ |
4441 | if (list_empty(&fs_devices->alloc_list)) |
4442 | return -ENOSPC; | |
b2117a39 | 4443 | |
31e50229 | 4444 | index = __get_raid_index(type); |
73c5de00 | 4445 | |
31e50229 LB |
4446 | sub_stripes = btrfs_raid_array[index].sub_stripes; |
4447 | dev_stripes = btrfs_raid_array[index].dev_stripes; | |
4448 | devs_max = btrfs_raid_array[index].devs_max; | |
4449 | devs_min = btrfs_raid_array[index].devs_min; | |
4450 | devs_increment = btrfs_raid_array[index].devs_increment; | |
4451 | ncopies = btrfs_raid_array[index].ncopies; | |
b2117a39 | 4452 | |
9b3f68b9 | 4453 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
73c5de00 AJ |
4454 | max_stripe_size = 1024 * 1024 * 1024; |
4455 | max_chunk_size = 10 * max_stripe_size; | |
23f8f9b7 GH |
4456 | if (!devs_max) |
4457 | devs_max = BTRFS_MAX_DEVS(info->chunk_root); | |
9b3f68b9 | 4458 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
1100373f CM |
4459 | /* for larger filesystems, use larger metadata chunks */ |
4460 | if (fs_devices->total_rw_bytes > 50ULL * 1024 * 1024 * 1024) | |
4461 | max_stripe_size = 1024 * 1024 * 1024; | |
4462 | else | |
4463 | max_stripe_size = 256 * 1024 * 1024; | |
73c5de00 | 4464 | max_chunk_size = max_stripe_size; |
23f8f9b7 GH |
4465 | if (!devs_max) |
4466 | devs_max = BTRFS_MAX_DEVS(info->chunk_root); | |
a40a90a0 | 4467 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
96bdc7dc | 4468 | max_stripe_size = 32 * 1024 * 1024; |
73c5de00 | 4469 | max_chunk_size = 2 * max_stripe_size; |
23f8f9b7 GH |
4470 | if (!devs_max) |
4471 | devs_max = BTRFS_MAX_DEVS_SYS_CHUNK; | |
73c5de00 | 4472 | } else { |
351fd353 | 4473 | btrfs_err(info, "invalid chunk type 0x%llx requested", |
73c5de00 AJ |
4474 | type); |
4475 | BUG_ON(1); | |
9b3f68b9 CM |
4476 | } |
4477 | ||
2b82032c YZ |
4478 | /* we don't want a chunk larger than 10% of writeable space */ |
4479 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
4480 | max_chunk_size); | |
9b3f68b9 | 4481 | |
31e818fe | 4482 | devices_info = kcalloc(fs_devices->rw_devices, sizeof(*devices_info), |
73c5de00 AJ |
4483 | GFP_NOFS); |
4484 | if (!devices_info) | |
4485 | return -ENOMEM; | |
0cad8a11 | 4486 | |
73c5de00 | 4487 | cur = fs_devices->alloc_list.next; |
9b3f68b9 | 4488 | |
9f680ce0 | 4489 | /* |
73c5de00 AJ |
4490 | * in the first pass through the devices list, we gather information |
4491 | * about the available holes on each device. | |
9f680ce0 | 4492 | */ |
73c5de00 AJ |
4493 | ndevs = 0; |
4494 | while (cur != &fs_devices->alloc_list) { | |
4495 | struct btrfs_device *device; | |
4496 | u64 max_avail; | |
4497 | u64 dev_offset; | |
b2117a39 | 4498 | |
73c5de00 | 4499 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
9f680ce0 | 4500 | |
73c5de00 | 4501 | cur = cur->next; |
b2117a39 | 4502 | |
73c5de00 | 4503 | if (!device->writeable) { |
31b1a2bd | 4504 | WARN(1, KERN_ERR |
efe120a0 | 4505 | "BTRFS: read-only device in alloc_list\n"); |
73c5de00 AJ |
4506 | continue; |
4507 | } | |
b2117a39 | 4508 | |
63a212ab SB |
4509 | if (!device->in_fs_metadata || |
4510 | device->is_tgtdev_for_dev_replace) | |
73c5de00 | 4511 | continue; |
b2117a39 | 4512 | |
73c5de00 AJ |
4513 | if (device->total_bytes > device->bytes_used) |
4514 | total_avail = device->total_bytes - device->bytes_used; | |
4515 | else | |
4516 | total_avail = 0; | |
38c01b96 | 4517 | |
4518 | /* If there is no space on this device, skip it. */ | |
4519 | if (total_avail == 0) | |
4520 | continue; | |
b2117a39 | 4521 | |
6df9a95e | 4522 | ret = find_free_dev_extent(trans, device, |
73c5de00 AJ |
4523 | max_stripe_size * dev_stripes, |
4524 | &dev_offset, &max_avail); | |
4525 | if (ret && ret != -ENOSPC) | |
4526 | goto error; | |
b2117a39 | 4527 | |
73c5de00 AJ |
4528 | if (ret == 0) |
4529 | max_avail = max_stripe_size * dev_stripes; | |
b2117a39 | 4530 | |
73c5de00 AJ |
4531 | if (max_avail < BTRFS_STRIPE_LEN * dev_stripes) |
4532 | continue; | |
b2117a39 | 4533 | |
063d006f ES |
4534 | if (ndevs == fs_devices->rw_devices) { |
4535 | WARN(1, "%s: found more than %llu devices\n", | |
4536 | __func__, fs_devices->rw_devices); | |
4537 | break; | |
4538 | } | |
73c5de00 AJ |
4539 | devices_info[ndevs].dev_offset = dev_offset; |
4540 | devices_info[ndevs].max_avail = max_avail; | |
4541 | devices_info[ndevs].total_avail = total_avail; | |
4542 | devices_info[ndevs].dev = device; | |
4543 | ++ndevs; | |
4544 | } | |
b2117a39 | 4545 | |
73c5de00 AJ |
4546 | /* |
4547 | * now sort the devices by hole size / available space | |
4548 | */ | |
4549 | sort(devices_info, ndevs, sizeof(struct btrfs_device_info), | |
4550 | btrfs_cmp_device_info, NULL); | |
b2117a39 | 4551 | |
73c5de00 AJ |
4552 | /* round down to number of usable stripes */ |
4553 | ndevs -= ndevs % devs_increment; | |
b2117a39 | 4554 | |
73c5de00 AJ |
4555 | if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) { |
4556 | ret = -ENOSPC; | |
4557 | goto error; | |
b2117a39 | 4558 | } |
9f680ce0 | 4559 | |
73c5de00 AJ |
4560 | if (devs_max && ndevs > devs_max) |
4561 | ndevs = devs_max; | |
4562 | /* | |
4563 | * the primary goal is to maximize the number of stripes, so use as many | |
4564 | * devices as possible, even if the stripes are not maximum sized. | |
4565 | */ | |
4566 | stripe_size = devices_info[ndevs-1].max_avail; | |
4567 | num_stripes = ndevs * dev_stripes; | |
b2117a39 | 4568 | |
53b381b3 DW |
4569 | /* |
4570 | * this will have to be fixed for RAID1 and RAID10 over | |
4571 | * more drives | |
4572 | */ | |
4573 | data_stripes = num_stripes / ncopies; | |
4574 | ||
53b381b3 DW |
4575 | if (type & BTRFS_BLOCK_GROUP_RAID5) { |
4576 | raid_stripe_len = find_raid56_stripe_len(ndevs - 1, | |
4577 | btrfs_super_stripesize(info->super_copy)); | |
4578 | data_stripes = num_stripes - 1; | |
4579 | } | |
4580 | if (type & BTRFS_BLOCK_GROUP_RAID6) { | |
4581 | raid_stripe_len = find_raid56_stripe_len(ndevs - 2, | |
4582 | btrfs_super_stripesize(info->super_copy)); | |
4583 | data_stripes = num_stripes - 2; | |
4584 | } | |
86db2578 CM |
4585 | |
4586 | /* | |
4587 | * Use the number of data stripes to figure out how big this chunk | |
4588 | * is really going to be in terms of logical address space, | |
4589 | * and compare that answer with the max chunk size | |
4590 | */ | |
4591 | if (stripe_size * data_stripes > max_chunk_size) { | |
4592 | u64 mask = (1ULL << 24) - 1; | |
b8b93add DS |
4593 | |
4594 | stripe_size = div_u64(max_chunk_size, data_stripes); | |
86db2578 CM |
4595 | |
4596 | /* bump the answer up to a 16MB boundary */ | |
4597 | stripe_size = (stripe_size + mask) & ~mask; | |
4598 | ||
4599 | /* but don't go higher than the limits we found | |
4600 | * while searching for free extents | |
4601 | */ | |
4602 | if (stripe_size > devices_info[ndevs-1].max_avail) | |
4603 | stripe_size = devices_info[ndevs-1].max_avail; | |
4604 | } | |
4605 | ||
b8b93add | 4606 | stripe_size = div_u64(stripe_size, dev_stripes); |
37db63a4 ID |
4607 | |
4608 | /* align to BTRFS_STRIPE_LEN */ | |
b8b93add | 4609 | stripe_size = div_u64(stripe_size, raid_stripe_len); |
53b381b3 | 4610 | stripe_size *= raid_stripe_len; |
b2117a39 MX |
4611 | |
4612 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
4613 | if (!map) { | |
4614 | ret = -ENOMEM; | |
4615 | goto error; | |
4616 | } | |
4617 | map->num_stripes = num_stripes; | |
9b3f68b9 | 4618 | |
73c5de00 AJ |
4619 | for (i = 0; i < ndevs; ++i) { |
4620 | for (j = 0; j < dev_stripes; ++j) { | |
4621 | int s = i * dev_stripes + j; | |
4622 | map->stripes[s].dev = devices_info[i].dev; | |
4623 | map->stripes[s].physical = devices_info[i].dev_offset + | |
4624 | j * stripe_size; | |
6324fbf3 | 4625 | } |
6324fbf3 | 4626 | } |
2b82032c | 4627 | map->sector_size = extent_root->sectorsize; |
53b381b3 DW |
4628 | map->stripe_len = raid_stripe_len; |
4629 | map->io_align = raid_stripe_len; | |
4630 | map->io_width = raid_stripe_len; | |
2b82032c | 4631 | map->type = type; |
2b82032c | 4632 | map->sub_stripes = sub_stripes; |
0b86a832 | 4633 | |
53b381b3 | 4634 | num_bytes = stripe_size * data_stripes; |
0b86a832 | 4635 | |
73c5de00 | 4636 | trace_btrfs_chunk_alloc(info->chunk_root, map, start, num_bytes); |
1abe9b8a | 4637 | |
172ddd60 | 4638 | em = alloc_extent_map(); |
2b82032c | 4639 | if (!em) { |
298a8f9c | 4640 | kfree(map); |
b2117a39 MX |
4641 | ret = -ENOMEM; |
4642 | goto error; | |
593060d7 | 4643 | } |
298a8f9c | 4644 | set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags); |
2b82032c YZ |
4645 | em->bdev = (struct block_device *)map; |
4646 | em->start = start; | |
73c5de00 | 4647 | em->len = num_bytes; |
2b82032c YZ |
4648 | em->block_start = 0; |
4649 | em->block_len = em->len; | |
6df9a95e | 4650 | em->orig_block_len = stripe_size; |
593060d7 | 4651 | |
2b82032c | 4652 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
890871be | 4653 | write_lock(&em_tree->lock); |
09a2a8f9 | 4654 | ret = add_extent_mapping(em_tree, em, 0); |
6df9a95e JB |
4655 | if (!ret) { |
4656 | list_add_tail(&em->list, &trans->transaction->pending_chunks); | |
4657 | atomic_inc(&em->refs); | |
4658 | } | |
890871be | 4659 | write_unlock(&em_tree->lock); |
0f5d42b2 JB |
4660 | if (ret) { |
4661 | free_extent_map(em); | |
1dd4602f | 4662 | goto error; |
0f5d42b2 | 4663 | } |
0b86a832 | 4664 | |
04487488 JB |
4665 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
4666 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
4667 | start, num_bytes); | |
6df9a95e JB |
4668 | if (ret) |
4669 | goto error_del_extent; | |
2b82032c | 4670 | |
7cc8e58d MX |
4671 | for (i = 0; i < map->num_stripes; i++) { |
4672 | num_bytes = map->stripes[i].dev->bytes_used + stripe_size; | |
4673 | btrfs_device_set_bytes_used(map->stripes[i].dev, num_bytes); | |
4674 | } | |
43530c46 | 4675 | |
1c116187 MX |
4676 | spin_lock(&extent_root->fs_info->free_chunk_lock); |
4677 | extent_root->fs_info->free_chunk_space -= (stripe_size * | |
4678 | map->num_stripes); | |
4679 | spin_unlock(&extent_root->fs_info->free_chunk_lock); | |
4680 | ||
0f5d42b2 | 4681 | free_extent_map(em); |
53b381b3 DW |
4682 | check_raid56_incompat_flag(extent_root->fs_info, type); |
4683 | ||
b2117a39 | 4684 | kfree(devices_info); |
2b82032c | 4685 | return 0; |
b2117a39 | 4686 | |
6df9a95e | 4687 | error_del_extent: |
0f5d42b2 JB |
4688 | write_lock(&em_tree->lock); |
4689 | remove_extent_mapping(em_tree, em); | |
4690 | write_unlock(&em_tree->lock); | |
4691 | ||
4692 | /* One for our allocation */ | |
4693 | free_extent_map(em); | |
4694 | /* One for the tree reference */ | |
4695 | free_extent_map(em); | |
495e64f4 FM |
4696 | /* One for the pending_chunks list reference */ |
4697 | free_extent_map(em); | |
b2117a39 | 4698 | error: |
b2117a39 MX |
4699 | kfree(devices_info); |
4700 | return ret; | |
2b82032c YZ |
4701 | } |
4702 | ||
6df9a95e | 4703 | int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, |
2b82032c | 4704 | struct btrfs_root *extent_root, |
6df9a95e | 4705 | u64 chunk_offset, u64 chunk_size) |
2b82032c | 4706 | { |
2b82032c YZ |
4707 | struct btrfs_key key; |
4708 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
4709 | struct btrfs_device *device; | |
4710 | struct btrfs_chunk *chunk; | |
4711 | struct btrfs_stripe *stripe; | |
6df9a95e JB |
4712 | struct extent_map_tree *em_tree; |
4713 | struct extent_map *em; | |
4714 | struct map_lookup *map; | |
4715 | size_t item_size; | |
4716 | u64 dev_offset; | |
4717 | u64 stripe_size; | |
4718 | int i = 0; | |
2b82032c YZ |
4719 | int ret; |
4720 | ||
6df9a95e JB |
4721 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
4722 | read_lock(&em_tree->lock); | |
4723 | em = lookup_extent_mapping(em_tree, chunk_offset, chunk_size); | |
4724 | read_unlock(&em_tree->lock); | |
4725 | ||
4726 | if (!em) { | |
4727 | btrfs_crit(extent_root->fs_info, "unable to find logical " | |
4728 | "%Lu len %Lu", chunk_offset, chunk_size); | |
4729 | return -EINVAL; | |
4730 | } | |
4731 | ||
4732 | if (em->start != chunk_offset || em->len != chunk_size) { | |
4733 | btrfs_crit(extent_root->fs_info, "found a bad mapping, wanted" | |
351fd353 | 4734 | " %Lu-%Lu, found %Lu-%Lu", chunk_offset, |
6df9a95e JB |
4735 | chunk_size, em->start, em->len); |
4736 | free_extent_map(em); | |
4737 | return -EINVAL; | |
4738 | } | |
4739 | ||
4740 | map = (struct map_lookup *)em->bdev; | |
4741 | item_size = btrfs_chunk_item_size(map->num_stripes); | |
4742 | stripe_size = em->orig_block_len; | |
4743 | ||
2b82032c | 4744 | chunk = kzalloc(item_size, GFP_NOFS); |
6df9a95e JB |
4745 | if (!chunk) { |
4746 | ret = -ENOMEM; | |
4747 | goto out; | |
4748 | } | |
4749 | ||
4750 | for (i = 0; i < map->num_stripes; i++) { | |
4751 | device = map->stripes[i].dev; | |
4752 | dev_offset = map->stripes[i].physical; | |
2b82032c | 4753 | |
0b86a832 | 4754 | ret = btrfs_update_device(trans, device); |
3acd3953 | 4755 | if (ret) |
6df9a95e JB |
4756 | goto out; |
4757 | ret = btrfs_alloc_dev_extent(trans, device, | |
4758 | chunk_root->root_key.objectid, | |
4759 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
4760 | chunk_offset, dev_offset, | |
4761 | stripe_size); | |
4762 | if (ret) | |
4763 | goto out; | |
2b82032c YZ |
4764 | } |
4765 | ||
2b82032c | 4766 | stripe = &chunk->stripe; |
6df9a95e JB |
4767 | for (i = 0; i < map->num_stripes; i++) { |
4768 | device = map->stripes[i].dev; | |
4769 | dev_offset = map->stripes[i].physical; | |
0b86a832 | 4770 | |
e17cade2 CM |
4771 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
4772 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
4773 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 4774 | stripe++; |
0b86a832 CM |
4775 | } |
4776 | ||
2b82032c | 4777 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 4778 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
4779 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
4780 | btrfs_set_stack_chunk_type(chunk, map->type); | |
4781 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
4782 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
4783 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b86a832 | 4784 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
2b82032c | 4785 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 4786 | |
2b82032c YZ |
4787 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
4788 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
4789 | key.offset = chunk_offset; | |
0b86a832 | 4790 | |
2b82032c | 4791 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
4ed1d16e MF |
4792 | if (ret == 0 && map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
4793 | /* | |
4794 | * TODO: Cleanup of inserted chunk root in case of | |
4795 | * failure. | |
4796 | */ | |
125ccb0a | 4797 | ret = btrfs_add_system_chunk(chunk_root, &key, chunk, |
2b82032c | 4798 | item_size); |
8f18cf13 | 4799 | } |
1abe9b8a | 4800 | |
6df9a95e | 4801 | out: |
0b86a832 | 4802 | kfree(chunk); |
6df9a95e | 4803 | free_extent_map(em); |
4ed1d16e | 4804 | return ret; |
2b82032c | 4805 | } |
0b86a832 | 4806 | |
2b82032c YZ |
4807 | /* |
4808 | * Chunk allocation falls into two parts. The first part does works | |
4809 | * that make the new allocated chunk useable, but not do any operation | |
4810 | * that modifies the chunk tree. The second part does the works that | |
4811 | * require modifying the chunk tree. This division is important for the | |
4812 | * bootstrap process of adding storage to a seed btrfs. | |
4813 | */ | |
4814 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
4815 | struct btrfs_root *extent_root, u64 type) | |
4816 | { | |
4817 | u64 chunk_offset; | |
2b82032c | 4818 | |
a9629596 | 4819 | ASSERT(mutex_is_locked(&extent_root->fs_info->chunk_mutex)); |
6df9a95e JB |
4820 | chunk_offset = find_next_chunk(extent_root->fs_info); |
4821 | return __btrfs_alloc_chunk(trans, extent_root, chunk_offset, type); | |
2b82032c YZ |
4822 | } |
4823 | ||
d397712b | 4824 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
2b82032c YZ |
4825 | struct btrfs_root *root, |
4826 | struct btrfs_device *device) | |
4827 | { | |
4828 | u64 chunk_offset; | |
4829 | u64 sys_chunk_offset; | |
2b82032c | 4830 | u64 alloc_profile; |
2b82032c YZ |
4831 | struct btrfs_fs_info *fs_info = root->fs_info; |
4832 | struct btrfs_root *extent_root = fs_info->extent_root; | |
4833 | int ret; | |
4834 | ||
6df9a95e | 4835 | chunk_offset = find_next_chunk(fs_info); |
de98ced9 | 4836 | alloc_profile = btrfs_get_alloc_profile(extent_root, 0); |
6df9a95e JB |
4837 | ret = __btrfs_alloc_chunk(trans, extent_root, chunk_offset, |
4838 | alloc_profile); | |
79787eaa JM |
4839 | if (ret) |
4840 | return ret; | |
2b82032c | 4841 | |
6df9a95e | 4842 | sys_chunk_offset = find_next_chunk(root->fs_info); |
de98ced9 | 4843 | alloc_profile = btrfs_get_alloc_profile(fs_info->chunk_root, 0); |
6df9a95e JB |
4844 | ret = __btrfs_alloc_chunk(trans, extent_root, sys_chunk_offset, |
4845 | alloc_profile); | |
79787eaa | 4846 | return ret; |
2b82032c YZ |
4847 | } |
4848 | ||
d20983b4 MX |
4849 | static inline int btrfs_chunk_max_errors(struct map_lookup *map) |
4850 | { | |
4851 | int max_errors; | |
4852 | ||
4853 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | | |
4854 | BTRFS_BLOCK_GROUP_RAID10 | | |
4855 | BTRFS_BLOCK_GROUP_RAID5 | | |
4856 | BTRFS_BLOCK_GROUP_DUP)) { | |
4857 | max_errors = 1; | |
4858 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID6) { | |
4859 | max_errors = 2; | |
4860 | } else { | |
4861 | max_errors = 0; | |
005d6427 | 4862 | } |
2b82032c | 4863 | |
d20983b4 | 4864 | return max_errors; |
2b82032c YZ |
4865 | } |
4866 | ||
4867 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) | |
4868 | { | |
4869 | struct extent_map *em; | |
4870 | struct map_lookup *map; | |
4871 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
4872 | int readonly = 0; | |
d20983b4 | 4873 | int miss_ndevs = 0; |
2b82032c YZ |
4874 | int i; |
4875 | ||
890871be | 4876 | read_lock(&map_tree->map_tree.lock); |
2b82032c | 4877 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
890871be | 4878 | read_unlock(&map_tree->map_tree.lock); |
2b82032c YZ |
4879 | if (!em) |
4880 | return 1; | |
4881 | ||
4882 | map = (struct map_lookup *)em->bdev; | |
4883 | for (i = 0; i < map->num_stripes; i++) { | |
d20983b4 MX |
4884 | if (map->stripes[i].dev->missing) { |
4885 | miss_ndevs++; | |
4886 | continue; | |
4887 | } | |
4888 | ||
2b82032c YZ |
4889 | if (!map->stripes[i].dev->writeable) { |
4890 | readonly = 1; | |
d20983b4 | 4891 | goto end; |
2b82032c YZ |
4892 | } |
4893 | } | |
d20983b4 MX |
4894 | |
4895 | /* | |
4896 | * If the number of missing devices is larger than max errors, | |
4897 | * we can not write the data into that chunk successfully, so | |
4898 | * set it readonly. | |
4899 | */ | |
4900 | if (miss_ndevs > btrfs_chunk_max_errors(map)) | |
4901 | readonly = 1; | |
4902 | end: | |
0b86a832 | 4903 | free_extent_map(em); |
2b82032c | 4904 | return readonly; |
0b86a832 CM |
4905 | } |
4906 | ||
4907 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
4908 | { | |
a8067e02 | 4909 | extent_map_tree_init(&tree->map_tree); |
0b86a832 CM |
4910 | } |
4911 | ||
4912 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
4913 | { | |
4914 | struct extent_map *em; | |
4915 | ||
d397712b | 4916 | while (1) { |
890871be | 4917 | write_lock(&tree->map_tree.lock); |
0b86a832 CM |
4918 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
4919 | if (em) | |
4920 | remove_extent_mapping(&tree->map_tree, em); | |
890871be | 4921 | write_unlock(&tree->map_tree.lock); |
0b86a832 CM |
4922 | if (!em) |
4923 | break; | |
0b86a832 CM |
4924 | /* once for us */ |
4925 | free_extent_map(em); | |
4926 | /* once for the tree */ | |
4927 | free_extent_map(em); | |
4928 | } | |
4929 | } | |
4930 | ||
5d964051 | 4931 | int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len) |
f188591e | 4932 | { |
5d964051 | 4933 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
f188591e CM |
4934 | struct extent_map *em; |
4935 | struct map_lookup *map; | |
4936 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
4937 | int ret; | |
4938 | ||
890871be | 4939 | read_lock(&em_tree->lock); |
f188591e | 4940 | em = lookup_extent_mapping(em_tree, logical, len); |
890871be | 4941 | read_unlock(&em_tree->lock); |
f188591e | 4942 | |
fb7669b5 JB |
4943 | /* |
4944 | * We could return errors for these cases, but that could get ugly and | |
4945 | * we'd probably do the same thing which is just not do anything else | |
4946 | * and exit, so return 1 so the callers don't try to use other copies. | |
4947 | */ | |
4948 | if (!em) { | |
351fd353 | 4949 | btrfs_crit(fs_info, "No mapping for %Lu-%Lu", logical, |
fb7669b5 JB |
4950 | logical+len); |
4951 | return 1; | |
4952 | } | |
4953 | ||
4954 | if (em->start > logical || em->start + em->len < logical) { | |
ccf39f92 | 4955 | btrfs_crit(fs_info, "Invalid mapping for %Lu-%Lu, got " |
351fd353 | 4956 | "%Lu-%Lu", logical, logical+len, em->start, |
fb7669b5 | 4957 | em->start + em->len); |
7d3d1744 | 4958 | free_extent_map(em); |
fb7669b5 JB |
4959 | return 1; |
4960 | } | |
4961 | ||
f188591e CM |
4962 | map = (struct map_lookup *)em->bdev; |
4963 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
4964 | ret = map->num_stripes; | |
321aecc6 CM |
4965 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
4966 | ret = map->sub_stripes; | |
53b381b3 DW |
4967 | else if (map->type & BTRFS_BLOCK_GROUP_RAID5) |
4968 | ret = 2; | |
4969 | else if (map->type & BTRFS_BLOCK_GROUP_RAID6) | |
4970 | ret = 3; | |
f188591e CM |
4971 | else |
4972 | ret = 1; | |
4973 | free_extent_map(em); | |
ad6d620e SB |
4974 | |
4975 | btrfs_dev_replace_lock(&fs_info->dev_replace); | |
4976 | if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) | |
4977 | ret++; | |
4978 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
4979 | ||
f188591e CM |
4980 | return ret; |
4981 | } | |
4982 | ||
53b381b3 DW |
4983 | unsigned long btrfs_full_stripe_len(struct btrfs_root *root, |
4984 | struct btrfs_mapping_tree *map_tree, | |
4985 | u64 logical) | |
4986 | { | |
4987 | struct extent_map *em; | |
4988 | struct map_lookup *map; | |
4989 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
4990 | unsigned long len = root->sectorsize; | |
4991 | ||
4992 | read_lock(&em_tree->lock); | |
4993 | em = lookup_extent_mapping(em_tree, logical, len); | |
4994 | read_unlock(&em_tree->lock); | |
4995 | BUG_ON(!em); | |
4996 | ||
4997 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
4998 | map = (struct map_lookup *)em->bdev; | |
ffe2d203 | 4999 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 | 5000 | len = map->stripe_len * nr_data_stripes(map); |
53b381b3 DW |
5001 | free_extent_map(em); |
5002 | return len; | |
5003 | } | |
5004 | ||
5005 | int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree, | |
5006 | u64 logical, u64 len, int mirror_num) | |
5007 | { | |
5008 | struct extent_map *em; | |
5009 | struct map_lookup *map; | |
5010 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
5011 | int ret = 0; | |
5012 | ||
5013 | read_lock(&em_tree->lock); | |
5014 | em = lookup_extent_mapping(em_tree, logical, len); | |
5015 | read_unlock(&em_tree->lock); | |
5016 | BUG_ON(!em); | |
5017 | ||
5018 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
5019 | map = (struct map_lookup *)em->bdev; | |
ffe2d203 | 5020 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 DW |
5021 | ret = 1; |
5022 | free_extent_map(em); | |
5023 | return ret; | |
5024 | } | |
5025 | ||
30d9861f SB |
5026 | static int find_live_mirror(struct btrfs_fs_info *fs_info, |
5027 | struct map_lookup *map, int first, int num, | |
5028 | int optimal, int dev_replace_is_ongoing) | |
dfe25020 CM |
5029 | { |
5030 | int i; | |
30d9861f SB |
5031 | int tolerance; |
5032 | struct btrfs_device *srcdev; | |
5033 | ||
5034 | if (dev_replace_is_ongoing && | |
5035 | fs_info->dev_replace.cont_reading_from_srcdev_mode == | |
5036 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID) | |
5037 | srcdev = fs_info->dev_replace.srcdev; | |
5038 | else | |
5039 | srcdev = NULL; | |
5040 | ||
5041 | /* | |
5042 | * try to avoid the drive that is the source drive for a | |
5043 | * dev-replace procedure, only choose it if no other non-missing | |
5044 | * mirror is available | |
5045 | */ | |
5046 | for (tolerance = 0; tolerance < 2; tolerance++) { | |
5047 | if (map->stripes[optimal].dev->bdev && | |
5048 | (tolerance || map->stripes[optimal].dev != srcdev)) | |
5049 | return optimal; | |
5050 | for (i = first; i < first + num; i++) { | |
5051 | if (map->stripes[i].dev->bdev && | |
5052 | (tolerance || map->stripes[i].dev != srcdev)) | |
5053 | return i; | |
5054 | } | |
dfe25020 | 5055 | } |
30d9861f | 5056 | |
dfe25020 CM |
5057 | /* we couldn't find one that doesn't fail. Just return something |
5058 | * and the io error handling code will clean up eventually | |
5059 | */ | |
5060 | return optimal; | |
5061 | } | |
5062 | ||
53b381b3 DW |
5063 | static inline int parity_smaller(u64 a, u64 b) |
5064 | { | |
5065 | return a > b; | |
5066 | } | |
5067 | ||
5068 | /* Bubble-sort the stripe set to put the parity/syndrome stripes last */ | |
8e5cfb55 | 5069 | static void sort_parity_stripes(struct btrfs_bio *bbio, int num_stripes) |
53b381b3 DW |
5070 | { |
5071 | struct btrfs_bio_stripe s; | |
5072 | int i; | |
5073 | u64 l; | |
5074 | int again = 1; | |
5075 | ||
5076 | while (again) { | |
5077 | again = 0; | |
cc7539ed | 5078 | for (i = 0; i < num_stripes - 1; i++) { |
8e5cfb55 ZL |
5079 | if (parity_smaller(bbio->raid_map[i], |
5080 | bbio->raid_map[i+1])) { | |
53b381b3 | 5081 | s = bbio->stripes[i]; |
8e5cfb55 | 5082 | l = bbio->raid_map[i]; |
53b381b3 | 5083 | bbio->stripes[i] = bbio->stripes[i+1]; |
8e5cfb55 | 5084 | bbio->raid_map[i] = bbio->raid_map[i+1]; |
53b381b3 | 5085 | bbio->stripes[i+1] = s; |
8e5cfb55 | 5086 | bbio->raid_map[i+1] = l; |
2c8cdd6e | 5087 | |
53b381b3 DW |
5088 | again = 1; |
5089 | } | |
5090 | } | |
5091 | } | |
5092 | } | |
5093 | ||
6e9606d2 ZL |
5094 | static struct btrfs_bio *alloc_btrfs_bio(int total_stripes, int real_stripes) |
5095 | { | |
5096 | struct btrfs_bio *bbio = kzalloc( | |
e57cf21e | 5097 | /* the size of the btrfs_bio */ |
6e9606d2 | 5098 | sizeof(struct btrfs_bio) + |
e57cf21e | 5099 | /* plus the variable array for the stripes */ |
6e9606d2 | 5100 | sizeof(struct btrfs_bio_stripe) * (total_stripes) + |
e57cf21e | 5101 | /* plus the variable array for the tgt dev */ |
6e9606d2 | 5102 | sizeof(int) * (real_stripes) + |
e57cf21e CM |
5103 | /* |
5104 | * plus the raid_map, which includes both the tgt dev | |
5105 | * and the stripes | |
5106 | */ | |
5107 | sizeof(u64) * (total_stripes), | |
277fb5fc | 5108 | GFP_NOFS|__GFP_NOFAIL); |
6e9606d2 ZL |
5109 | |
5110 | atomic_set(&bbio->error, 0); | |
5111 | atomic_set(&bbio->refs, 1); | |
5112 | ||
5113 | return bbio; | |
5114 | } | |
5115 | ||
5116 | void btrfs_get_bbio(struct btrfs_bio *bbio) | |
5117 | { | |
5118 | WARN_ON(!atomic_read(&bbio->refs)); | |
5119 | atomic_inc(&bbio->refs); | |
5120 | } | |
5121 | ||
5122 | void btrfs_put_bbio(struct btrfs_bio *bbio) | |
5123 | { | |
5124 | if (!bbio) | |
5125 | return; | |
5126 | if (atomic_dec_and_test(&bbio->refs)) | |
5127 | kfree(bbio); | |
5128 | } | |
5129 | ||
3ec706c8 | 5130 | static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, |
f2d8d74d | 5131 | u64 logical, u64 *length, |
a1d3c478 | 5132 | struct btrfs_bio **bbio_ret, |
8e5cfb55 | 5133 | int mirror_num, int need_raid_map) |
0b86a832 CM |
5134 | { |
5135 | struct extent_map *em; | |
5136 | struct map_lookup *map; | |
3ec706c8 | 5137 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
0b86a832 CM |
5138 | struct extent_map_tree *em_tree = &map_tree->map_tree; |
5139 | u64 offset; | |
593060d7 | 5140 | u64 stripe_offset; |
fce3bb9a | 5141 | u64 stripe_end_offset; |
593060d7 | 5142 | u64 stripe_nr; |
fce3bb9a LD |
5143 | u64 stripe_nr_orig; |
5144 | u64 stripe_nr_end; | |
53b381b3 | 5145 | u64 stripe_len; |
9d644a62 | 5146 | u32 stripe_index; |
cea9e445 | 5147 | int i; |
de11cc12 | 5148 | int ret = 0; |
f2d8d74d | 5149 | int num_stripes; |
a236aed1 | 5150 | int max_errors = 0; |
2c8cdd6e | 5151 | int tgtdev_indexes = 0; |
a1d3c478 | 5152 | struct btrfs_bio *bbio = NULL; |
472262f3 SB |
5153 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
5154 | int dev_replace_is_ongoing = 0; | |
5155 | int num_alloc_stripes; | |
ad6d620e SB |
5156 | int patch_the_first_stripe_for_dev_replace = 0; |
5157 | u64 physical_to_patch_in_first_stripe = 0; | |
53b381b3 | 5158 | u64 raid56_full_stripe_start = (u64)-1; |
0b86a832 | 5159 | |
890871be | 5160 | read_lock(&em_tree->lock); |
0b86a832 | 5161 | em = lookup_extent_mapping(em_tree, logical, *length); |
890871be | 5162 | read_unlock(&em_tree->lock); |
f2d8d74d | 5163 | |
3b951516 | 5164 | if (!em) { |
c2cf52eb | 5165 | btrfs_crit(fs_info, "unable to find logical %llu len %llu", |
c1c9ff7c | 5166 | logical, *length); |
9bb91873 JB |
5167 | return -EINVAL; |
5168 | } | |
5169 | ||
5170 | if (em->start > logical || em->start + em->len < logical) { | |
5171 | btrfs_crit(fs_info, "found a bad mapping, wanted %Lu, " | |
351fd353 | 5172 | "found %Lu-%Lu", logical, em->start, |
9bb91873 | 5173 | em->start + em->len); |
7d3d1744 | 5174 | free_extent_map(em); |
9bb91873 | 5175 | return -EINVAL; |
3b951516 | 5176 | } |
0b86a832 | 5177 | |
0b86a832 CM |
5178 | map = (struct map_lookup *)em->bdev; |
5179 | offset = logical - em->start; | |
593060d7 | 5180 | |
53b381b3 | 5181 | stripe_len = map->stripe_len; |
593060d7 CM |
5182 | stripe_nr = offset; |
5183 | /* | |
5184 | * stripe_nr counts the total number of stripes we have to stride | |
5185 | * to get to this block | |
5186 | */ | |
47c5713f | 5187 | stripe_nr = div64_u64(stripe_nr, stripe_len); |
593060d7 | 5188 | |
53b381b3 | 5189 | stripe_offset = stripe_nr * stripe_len; |
593060d7 CM |
5190 | BUG_ON(offset < stripe_offset); |
5191 | ||
5192 | /* stripe_offset is the offset of this block in its stripe*/ | |
5193 | stripe_offset = offset - stripe_offset; | |
5194 | ||
53b381b3 | 5195 | /* if we're here for raid56, we need to know the stripe aligned start */ |
ffe2d203 | 5196 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
53b381b3 DW |
5197 | unsigned long full_stripe_len = stripe_len * nr_data_stripes(map); |
5198 | raid56_full_stripe_start = offset; | |
5199 | ||
5200 | /* allow a write of a full stripe, but make sure we don't | |
5201 | * allow straddling of stripes | |
5202 | */ | |
47c5713f DS |
5203 | raid56_full_stripe_start = div64_u64(raid56_full_stripe_start, |
5204 | full_stripe_len); | |
53b381b3 DW |
5205 | raid56_full_stripe_start *= full_stripe_len; |
5206 | } | |
5207 | ||
5208 | if (rw & REQ_DISCARD) { | |
5209 | /* we don't discard raid56 yet */ | |
ffe2d203 | 5210 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
53b381b3 DW |
5211 | ret = -EOPNOTSUPP; |
5212 | goto out; | |
5213 | } | |
fce3bb9a | 5214 | *length = min_t(u64, em->len - offset, *length); |
53b381b3 DW |
5215 | } else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) { |
5216 | u64 max_len; | |
5217 | /* For writes to RAID[56], allow a full stripeset across all disks. | |
5218 | For other RAID types and for RAID[56] reads, just allow a single | |
5219 | stripe (on a single disk). */ | |
ffe2d203 | 5220 | if ((map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) && |
53b381b3 DW |
5221 | (rw & REQ_WRITE)) { |
5222 | max_len = stripe_len * nr_data_stripes(map) - | |
5223 | (offset - raid56_full_stripe_start); | |
5224 | } else { | |
5225 | /* we limit the length of each bio to what fits in a stripe */ | |
5226 | max_len = stripe_len - stripe_offset; | |
5227 | } | |
5228 | *length = min_t(u64, em->len - offset, max_len); | |
cea9e445 CM |
5229 | } else { |
5230 | *length = em->len - offset; | |
5231 | } | |
f2d8d74d | 5232 | |
53b381b3 DW |
5233 | /* This is for when we're called from btrfs_merge_bio_hook() and all |
5234 | it cares about is the length */ | |
a1d3c478 | 5235 | if (!bbio_ret) |
cea9e445 CM |
5236 | goto out; |
5237 | ||
472262f3 SB |
5238 | btrfs_dev_replace_lock(dev_replace); |
5239 | dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace); | |
5240 | if (!dev_replace_is_ongoing) | |
5241 | btrfs_dev_replace_unlock(dev_replace); | |
5242 | ||
ad6d620e SB |
5243 | if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 && |
5244 | !(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) && | |
5245 | dev_replace->tgtdev != NULL) { | |
5246 | /* | |
5247 | * in dev-replace case, for repair case (that's the only | |
5248 | * case where the mirror is selected explicitly when | |
5249 | * calling btrfs_map_block), blocks left of the left cursor | |
5250 | * can also be read from the target drive. | |
5251 | * For REQ_GET_READ_MIRRORS, the target drive is added as | |
5252 | * the last one to the array of stripes. For READ, it also | |
5253 | * needs to be supported using the same mirror number. | |
5254 | * If the requested block is not left of the left cursor, | |
5255 | * EIO is returned. This can happen because btrfs_num_copies() | |
5256 | * returns one more in the dev-replace case. | |
5257 | */ | |
5258 | u64 tmp_length = *length; | |
5259 | struct btrfs_bio *tmp_bbio = NULL; | |
5260 | int tmp_num_stripes; | |
5261 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
5262 | int index_srcdev = 0; | |
5263 | int found = 0; | |
5264 | u64 physical_of_found = 0; | |
5265 | ||
5266 | ret = __btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, | |
8e5cfb55 | 5267 | logical, &tmp_length, &tmp_bbio, 0, 0); |
ad6d620e SB |
5268 | if (ret) { |
5269 | WARN_ON(tmp_bbio != NULL); | |
5270 | goto out; | |
5271 | } | |
5272 | ||
5273 | tmp_num_stripes = tmp_bbio->num_stripes; | |
5274 | if (mirror_num > tmp_num_stripes) { | |
5275 | /* | |
5276 | * REQ_GET_READ_MIRRORS does not contain this | |
5277 | * mirror, that means that the requested area | |
5278 | * is not left of the left cursor | |
5279 | */ | |
5280 | ret = -EIO; | |
6e9606d2 | 5281 | btrfs_put_bbio(tmp_bbio); |
ad6d620e SB |
5282 | goto out; |
5283 | } | |
5284 | ||
5285 | /* | |
5286 | * process the rest of the function using the mirror_num | |
5287 | * of the source drive. Therefore look it up first. | |
5288 | * At the end, patch the device pointer to the one of the | |
5289 | * target drive. | |
5290 | */ | |
5291 | for (i = 0; i < tmp_num_stripes; i++) { | |
5292 | if (tmp_bbio->stripes[i].dev->devid == srcdev_devid) { | |
5293 | /* | |
5294 | * In case of DUP, in order to keep it | |
5295 | * simple, only add the mirror with the | |
5296 | * lowest physical address | |
5297 | */ | |
5298 | if (found && | |
5299 | physical_of_found <= | |
5300 | tmp_bbio->stripes[i].physical) | |
5301 | continue; | |
5302 | index_srcdev = i; | |
5303 | found = 1; | |
5304 | physical_of_found = | |
5305 | tmp_bbio->stripes[i].physical; | |
5306 | } | |
5307 | } | |
5308 | ||
5309 | if (found) { | |
5310 | mirror_num = index_srcdev + 1; | |
5311 | patch_the_first_stripe_for_dev_replace = 1; | |
5312 | physical_to_patch_in_first_stripe = physical_of_found; | |
5313 | } else { | |
5314 | WARN_ON(1); | |
5315 | ret = -EIO; | |
6e9606d2 | 5316 | btrfs_put_bbio(tmp_bbio); |
ad6d620e SB |
5317 | goto out; |
5318 | } | |
5319 | ||
6e9606d2 | 5320 | btrfs_put_bbio(tmp_bbio); |
ad6d620e SB |
5321 | } else if (mirror_num > map->num_stripes) { |
5322 | mirror_num = 0; | |
5323 | } | |
5324 | ||
f2d8d74d | 5325 | num_stripes = 1; |
cea9e445 | 5326 | stripe_index = 0; |
fce3bb9a | 5327 | stripe_nr_orig = stripe_nr; |
fda2832f | 5328 | stripe_nr_end = ALIGN(offset + *length, map->stripe_len); |
b8b93add | 5329 | stripe_nr_end = div_u64(stripe_nr_end, map->stripe_len); |
fce3bb9a LD |
5330 | stripe_end_offset = stripe_nr_end * map->stripe_len - |
5331 | (offset + *length); | |
53b381b3 | 5332 | |
fce3bb9a LD |
5333 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
5334 | if (rw & REQ_DISCARD) | |
5335 | num_stripes = min_t(u64, map->num_stripes, | |
5336 | stripe_nr_end - stripe_nr_orig); | |
47c5713f DS |
5337 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, |
5338 | &stripe_index); | |
28e1cc7d MX |
5339 | if (!(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS))) |
5340 | mirror_num = 1; | |
fce3bb9a | 5341 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
29a8d9a0 | 5342 | if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) |
f2d8d74d | 5343 | num_stripes = map->num_stripes; |
2fff734f | 5344 | else if (mirror_num) |
f188591e | 5345 | stripe_index = mirror_num - 1; |
dfe25020 | 5346 | else { |
30d9861f | 5347 | stripe_index = find_live_mirror(fs_info, map, 0, |
dfe25020 | 5348 | map->num_stripes, |
30d9861f SB |
5349 | current->pid % map->num_stripes, |
5350 | dev_replace_is_ongoing); | |
a1d3c478 | 5351 | mirror_num = stripe_index + 1; |
dfe25020 | 5352 | } |
2fff734f | 5353 | |
611f0e00 | 5354 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
29a8d9a0 | 5355 | if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) { |
f2d8d74d | 5356 | num_stripes = map->num_stripes; |
a1d3c478 | 5357 | } else if (mirror_num) { |
f188591e | 5358 | stripe_index = mirror_num - 1; |
a1d3c478 JS |
5359 | } else { |
5360 | mirror_num = 1; | |
5361 | } | |
2fff734f | 5362 | |
321aecc6 | 5363 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
9d644a62 | 5364 | u32 factor = map->num_stripes / map->sub_stripes; |
321aecc6 | 5365 | |
47c5713f | 5366 | stripe_nr = div_u64_rem(stripe_nr, factor, &stripe_index); |
321aecc6 CM |
5367 | stripe_index *= map->sub_stripes; |
5368 | ||
29a8d9a0 | 5369 | if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) |
f2d8d74d | 5370 | num_stripes = map->sub_stripes; |
fce3bb9a LD |
5371 | else if (rw & REQ_DISCARD) |
5372 | num_stripes = min_t(u64, map->sub_stripes * | |
5373 | (stripe_nr_end - stripe_nr_orig), | |
5374 | map->num_stripes); | |
321aecc6 CM |
5375 | else if (mirror_num) |
5376 | stripe_index += mirror_num - 1; | |
dfe25020 | 5377 | else { |
3e74317a | 5378 | int old_stripe_index = stripe_index; |
30d9861f SB |
5379 | stripe_index = find_live_mirror(fs_info, map, |
5380 | stripe_index, | |
dfe25020 | 5381 | map->sub_stripes, stripe_index + |
30d9861f SB |
5382 | current->pid % map->sub_stripes, |
5383 | dev_replace_is_ongoing); | |
3e74317a | 5384 | mirror_num = stripe_index - old_stripe_index + 1; |
dfe25020 | 5385 | } |
53b381b3 | 5386 | |
ffe2d203 | 5387 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
8e5cfb55 | 5388 | if (need_raid_map && |
af8e2d1d MX |
5389 | ((rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) || |
5390 | mirror_num > 1)) { | |
53b381b3 | 5391 | /* push stripe_nr back to the start of the full stripe */ |
b8b93add DS |
5392 | stripe_nr = div_u64(raid56_full_stripe_start, |
5393 | stripe_len * nr_data_stripes(map)); | |
53b381b3 DW |
5394 | |
5395 | /* RAID[56] write or recovery. Return all stripes */ | |
5396 | num_stripes = map->num_stripes; | |
5397 | max_errors = nr_parity_stripes(map); | |
5398 | ||
53b381b3 DW |
5399 | *length = map->stripe_len; |
5400 | stripe_index = 0; | |
5401 | stripe_offset = 0; | |
5402 | } else { | |
5403 | /* | |
5404 | * Mirror #0 or #1 means the original data block. | |
5405 | * Mirror #2 is RAID5 parity block. | |
5406 | * Mirror #3 is RAID6 Q block. | |
5407 | */ | |
47c5713f DS |
5408 | stripe_nr = div_u64_rem(stripe_nr, |
5409 | nr_data_stripes(map), &stripe_index); | |
53b381b3 DW |
5410 | if (mirror_num > 1) |
5411 | stripe_index = nr_data_stripes(map) + | |
5412 | mirror_num - 2; | |
5413 | ||
5414 | /* We distribute the parity blocks across stripes */ | |
47c5713f DS |
5415 | div_u64_rem(stripe_nr + stripe_index, map->num_stripes, |
5416 | &stripe_index); | |
28e1cc7d MX |
5417 | if (!(rw & (REQ_WRITE | REQ_DISCARD | |
5418 | REQ_GET_READ_MIRRORS)) && mirror_num <= 1) | |
5419 | mirror_num = 1; | |
53b381b3 | 5420 | } |
8790d502 CM |
5421 | } else { |
5422 | /* | |
47c5713f DS |
5423 | * after this, stripe_nr is the number of stripes on this |
5424 | * device we have to walk to find the data, and stripe_index is | |
5425 | * the number of our device in the stripe array | |
8790d502 | 5426 | */ |
47c5713f DS |
5427 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, |
5428 | &stripe_index); | |
a1d3c478 | 5429 | mirror_num = stripe_index + 1; |
8790d502 | 5430 | } |
593060d7 | 5431 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 5432 | |
472262f3 | 5433 | num_alloc_stripes = num_stripes; |
ad6d620e SB |
5434 | if (dev_replace_is_ongoing) { |
5435 | if (rw & (REQ_WRITE | REQ_DISCARD)) | |
5436 | num_alloc_stripes <<= 1; | |
5437 | if (rw & REQ_GET_READ_MIRRORS) | |
5438 | num_alloc_stripes++; | |
2c8cdd6e | 5439 | tgtdev_indexes = num_stripes; |
ad6d620e | 5440 | } |
2c8cdd6e | 5441 | |
6e9606d2 | 5442 | bbio = alloc_btrfs_bio(num_alloc_stripes, tgtdev_indexes); |
de11cc12 LZ |
5443 | if (!bbio) { |
5444 | ret = -ENOMEM; | |
5445 | goto out; | |
5446 | } | |
2c8cdd6e MX |
5447 | if (dev_replace_is_ongoing) |
5448 | bbio->tgtdev_map = (int *)(bbio->stripes + num_alloc_stripes); | |
de11cc12 | 5449 | |
8e5cfb55 | 5450 | /* build raid_map */ |
ffe2d203 | 5451 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK && |
8e5cfb55 ZL |
5452 | need_raid_map && ((rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) || |
5453 | mirror_num > 1)) { | |
5454 | u64 tmp; | |
9d644a62 | 5455 | unsigned rot; |
8e5cfb55 ZL |
5456 | |
5457 | bbio->raid_map = (u64 *)((void *)bbio->stripes + | |
5458 | sizeof(struct btrfs_bio_stripe) * | |
5459 | num_alloc_stripes + | |
5460 | sizeof(int) * tgtdev_indexes); | |
5461 | ||
5462 | /* Work out the disk rotation on this stripe-set */ | |
47c5713f | 5463 | div_u64_rem(stripe_nr, num_stripes, &rot); |
8e5cfb55 ZL |
5464 | |
5465 | /* Fill in the logical address of each stripe */ | |
5466 | tmp = stripe_nr * nr_data_stripes(map); | |
5467 | for (i = 0; i < nr_data_stripes(map); i++) | |
5468 | bbio->raid_map[(i+rot) % num_stripes] = | |
5469 | em->start + (tmp + i) * map->stripe_len; | |
5470 | ||
5471 | bbio->raid_map[(i+rot) % map->num_stripes] = RAID5_P_STRIPE; | |
5472 | if (map->type & BTRFS_BLOCK_GROUP_RAID6) | |
5473 | bbio->raid_map[(i+rot+1) % num_stripes] = | |
5474 | RAID6_Q_STRIPE; | |
5475 | } | |
5476 | ||
fce3bb9a | 5477 | if (rw & REQ_DISCARD) { |
9d644a62 DS |
5478 | u32 factor = 0; |
5479 | u32 sub_stripes = 0; | |
ec9ef7a1 LZ |
5480 | u64 stripes_per_dev = 0; |
5481 | u32 remaining_stripes = 0; | |
b89203f7 | 5482 | u32 last_stripe = 0; |
ec9ef7a1 LZ |
5483 | |
5484 | if (map->type & | |
5485 | (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID10)) { | |
5486 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
5487 | sub_stripes = 1; | |
5488 | else | |
5489 | sub_stripes = map->sub_stripes; | |
5490 | ||
5491 | factor = map->num_stripes / sub_stripes; | |
5492 | stripes_per_dev = div_u64_rem(stripe_nr_end - | |
5493 | stripe_nr_orig, | |
5494 | factor, | |
5495 | &remaining_stripes); | |
b89203f7 LB |
5496 | div_u64_rem(stripe_nr_end - 1, factor, &last_stripe); |
5497 | last_stripe *= sub_stripes; | |
ec9ef7a1 LZ |
5498 | } |
5499 | ||
fce3bb9a | 5500 | for (i = 0; i < num_stripes; i++) { |
a1d3c478 | 5501 | bbio->stripes[i].physical = |
f2d8d74d CM |
5502 | map->stripes[stripe_index].physical + |
5503 | stripe_offset + stripe_nr * map->stripe_len; | |
a1d3c478 | 5504 | bbio->stripes[i].dev = map->stripes[stripe_index].dev; |
fce3bb9a | 5505 | |
ec9ef7a1 LZ |
5506 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | |
5507 | BTRFS_BLOCK_GROUP_RAID10)) { | |
5508 | bbio->stripes[i].length = stripes_per_dev * | |
5509 | map->stripe_len; | |
b89203f7 | 5510 | |
ec9ef7a1 LZ |
5511 | if (i / sub_stripes < remaining_stripes) |
5512 | bbio->stripes[i].length += | |
5513 | map->stripe_len; | |
b89203f7 LB |
5514 | |
5515 | /* | |
5516 | * Special for the first stripe and | |
5517 | * the last stripe: | |
5518 | * | |
5519 | * |-------|...|-------| | |
5520 | * |----------| | |
5521 | * off end_off | |
5522 | */ | |
ec9ef7a1 | 5523 | if (i < sub_stripes) |
a1d3c478 | 5524 | bbio->stripes[i].length -= |
fce3bb9a | 5525 | stripe_offset; |
b89203f7 LB |
5526 | |
5527 | if (stripe_index >= last_stripe && | |
5528 | stripe_index <= (last_stripe + | |
5529 | sub_stripes - 1)) | |
a1d3c478 | 5530 | bbio->stripes[i].length -= |
fce3bb9a | 5531 | stripe_end_offset; |
b89203f7 | 5532 | |
ec9ef7a1 LZ |
5533 | if (i == sub_stripes - 1) |
5534 | stripe_offset = 0; | |
fce3bb9a | 5535 | } else |
a1d3c478 | 5536 | bbio->stripes[i].length = *length; |
fce3bb9a LD |
5537 | |
5538 | stripe_index++; | |
5539 | if (stripe_index == map->num_stripes) { | |
5540 | /* This could only happen for RAID0/10 */ | |
5541 | stripe_index = 0; | |
5542 | stripe_nr++; | |
5543 | } | |
5544 | } | |
5545 | } else { | |
5546 | for (i = 0; i < num_stripes; i++) { | |
a1d3c478 | 5547 | bbio->stripes[i].physical = |
212a17ab LT |
5548 | map->stripes[stripe_index].physical + |
5549 | stripe_offset + | |
5550 | stripe_nr * map->stripe_len; | |
a1d3c478 | 5551 | bbio->stripes[i].dev = |
212a17ab | 5552 | map->stripes[stripe_index].dev; |
fce3bb9a | 5553 | stripe_index++; |
f2d8d74d | 5554 | } |
593060d7 | 5555 | } |
de11cc12 | 5556 | |
d20983b4 MX |
5557 | if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) |
5558 | max_errors = btrfs_chunk_max_errors(map); | |
de11cc12 | 5559 | |
8e5cfb55 ZL |
5560 | if (bbio->raid_map) |
5561 | sort_parity_stripes(bbio, num_stripes); | |
cc7539ed | 5562 | |
2c8cdd6e | 5563 | tgtdev_indexes = 0; |
472262f3 SB |
5564 | if (dev_replace_is_ongoing && (rw & (REQ_WRITE | REQ_DISCARD)) && |
5565 | dev_replace->tgtdev != NULL) { | |
5566 | int index_where_to_add; | |
5567 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
5568 | ||
5569 | /* | |
5570 | * duplicate the write operations while the dev replace | |
5571 | * procedure is running. Since the copying of the old disk | |
5572 | * to the new disk takes place at run time while the | |
5573 | * filesystem is mounted writable, the regular write | |
5574 | * operations to the old disk have to be duplicated to go | |
5575 | * to the new disk as well. | |
5576 | * Note that device->missing is handled by the caller, and | |
5577 | * that the write to the old disk is already set up in the | |
5578 | * stripes array. | |
5579 | */ | |
5580 | index_where_to_add = num_stripes; | |
5581 | for (i = 0; i < num_stripes; i++) { | |
5582 | if (bbio->stripes[i].dev->devid == srcdev_devid) { | |
5583 | /* write to new disk, too */ | |
5584 | struct btrfs_bio_stripe *new = | |
5585 | bbio->stripes + index_where_to_add; | |
5586 | struct btrfs_bio_stripe *old = | |
5587 | bbio->stripes + i; | |
5588 | ||
5589 | new->physical = old->physical; | |
5590 | new->length = old->length; | |
5591 | new->dev = dev_replace->tgtdev; | |
2c8cdd6e | 5592 | bbio->tgtdev_map[i] = index_where_to_add; |
472262f3 SB |
5593 | index_where_to_add++; |
5594 | max_errors++; | |
2c8cdd6e | 5595 | tgtdev_indexes++; |
472262f3 SB |
5596 | } |
5597 | } | |
5598 | num_stripes = index_where_to_add; | |
ad6d620e SB |
5599 | } else if (dev_replace_is_ongoing && (rw & REQ_GET_READ_MIRRORS) && |
5600 | dev_replace->tgtdev != NULL) { | |
5601 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
5602 | int index_srcdev = 0; | |
5603 | int found = 0; | |
5604 | u64 physical_of_found = 0; | |
5605 | ||
5606 | /* | |
5607 | * During the dev-replace procedure, the target drive can | |
5608 | * also be used to read data in case it is needed to repair | |
5609 | * a corrupt block elsewhere. This is possible if the | |
5610 | * requested area is left of the left cursor. In this area, | |
5611 | * the target drive is a full copy of the source drive. | |
5612 | */ | |
5613 | for (i = 0; i < num_stripes; i++) { | |
5614 | if (bbio->stripes[i].dev->devid == srcdev_devid) { | |
5615 | /* | |
5616 | * In case of DUP, in order to keep it | |
5617 | * simple, only add the mirror with the | |
5618 | * lowest physical address | |
5619 | */ | |
5620 | if (found && | |
5621 | physical_of_found <= | |
5622 | bbio->stripes[i].physical) | |
5623 | continue; | |
5624 | index_srcdev = i; | |
5625 | found = 1; | |
5626 | physical_of_found = bbio->stripes[i].physical; | |
5627 | } | |
5628 | } | |
5629 | if (found) { | |
258ece02 | 5630 | if (physical_of_found + map->stripe_len <= |
ad6d620e SB |
5631 | dev_replace->cursor_left) { |
5632 | struct btrfs_bio_stripe *tgtdev_stripe = | |
5633 | bbio->stripes + num_stripes; | |
5634 | ||
5635 | tgtdev_stripe->physical = physical_of_found; | |
5636 | tgtdev_stripe->length = | |
5637 | bbio->stripes[index_srcdev].length; | |
5638 | tgtdev_stripe->dev = dev_replace->tgtdev; | |
2c8cdd6e | 5639 | bbio->tgtdev_map[index_srcdev] = num_stripes; |
ad6d620e | 5640 | |
2c8cdd6e | 5641 | tgtdev_indexes++; |
ad6d620e SB |
5642 | num_stripes++; |
5643 | } | |
5644 | } | |
472262f3 SB |
5645 | } |
5646 | ||
de11cc12 | 5647 | *bbio_ret = bbio; |
10f11900 | 5648 | bbio->map_type = map->type; |
de11cc12 LZ |
5649 | bbio->num_stripes = num_stripes; |
5650 | bbio->max_errors = max_errors; | |
5651 | bbio->mirror_num = mirror_num; | |
2c8cdd6e | 5652 | bbio->num_tgtdevs = tgtdev_indexes; |
ad6d620e SB |
5653 | |
5654 | /* | |
5655 | * this is the case that REQ_READ && dev_replace_is_ongoing && | |
5656 | * mirror_num == num_stripes + 1 && dev_replace target drive is | |
5657 | * available as a mirror | |
5658 | */ | |
5659 | if (patch_the_first_stripe_for_dev_replace && num_stripes > 0) { | |
5660 | WARN_ON(num_stripes > 1); | |
5661 | bbio->stripes[0].dev = dev_replace->tgtdev; | |
5662 | bbio->stripes[0].physical = physical_to_patch_in_first_stripe; | |
5663 | bbio->mirror_num = map->num_stripes + 1; | |
5664 | } | |
cea9e445 | 5665 | out: |
472262f3 SB |
5666 | if (dev_replace_is_ongoing) |
5667 | btrfs_dev_replace_unlock(dev_replace); | |
0b86a832 | 5668 | free_extent_map(em); |
de11cc12 | 5669 | return ret; |
0b86a832 CM |
5670 | } |
5671 | ||
3ec706c8 | 5672 | int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, |
f2d8d74d | 5673 | u64 logical, u64 *length, |
a1d3c478 | 5674 | struct btrfs_bio **bbio_ret, int mirror_num) |
f2d8d74d | 5675 | { |
3ec706c8 | 5676 | return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret, |
8e5cfb55 | 5677 | mirror_num, 0); |
f2d8d74d CM |
5678 | } |
5679 | ||
af8e2d1d MX |
5680 | /* For Scrub/replace */ |
5681 | int btrfs_map_sblock(struct btrfs_fs_info *fs_info, int rw, | |
5682 | u64 logical, u64 *length, | |
5683 | struct btrfs_bio **bbio_ret, int mirror_num, | |
8e5cfb55 | 5684 | int need_raid_map) |
af8e2d1d MX |
5685 | { |
5686 | return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret, | |
8e5cfb55 | 5687 | mirror_num, need_raid_map); |
af8e2d1d MX |
5688 | } |
5689 | ||
a512bbf8 YZ |
5690 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
5691 | u64 chunk_start, u64 physical, u64 devid, | |
5692 | u64 **logical, int *naddrs, int *stripe_len) | |
5693 | { | |
5694 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
5695 | struct extent_map *em; | |
5696 | struct map_lookup *map; | |
5697 | u64 *buf; | |
5698 | u64 bytenr; | |
5699 | u64 length; | |
5700 | u64 stripe_nr; | |
53b381b3 | 5701 | u64 rmap_len; |
a512bbf8 YZ |
5702 | int i, j, nr = 0; |
5703 | ||
890871be | 5704 | read_lock(&em_tree->lock); |
a512bbf8 | 5705 | em = lookup_extent_mapping(em_tree, chunk_start, 1); |
890871be | 5706 | read_unlock(&em_tree->lock); |
a512bbf8 | 5707 | |
835d974f | 5708 | if (!em) { |
efe120a0 | 5709 | printk(KERN_ERR "BTRFS: couldn't find em for chunk %Lu\n", |
835d974f JB |
5710 | chunk_start); |
5711 | return -EIO; | |
5712 | } | |
5713 | ||
5714 | if (em->start != chunk_start) { | |
efe120a0 | 5715 | printk(KERN_ERR "BTRFS: bad chunk start, em=%Lu, wanted=%Lu\n", |
835d974f JB |
5716 | em->start, chunk_start); |
5717 | free_extent_map(em); | |
5718 | return -EIO; | |
5719 | } | |
a512bbf8 YZ |
5720 | map = (struct map_lookup *)em->bdev; |
5721 | ||
5722 | length = em->len; | |
53b381b3 DW |
5723 | rmap_len = map->stripe_len; |
5724 | ||
a512bbf8 | 5725 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
b8b93add | 5726 | length = div_u64(length, map->num_stripes / map->sub_stripes); |
a512bbf8 | 5727 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) |
b8b93add | 5728 | length = div_u64(length, map->num_stripes); |
ffe2d203 | 5729 | else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
b8b93add | 5730 | length = div_u64(length, nr_data_stripes(map)); |
53b381b3 DW |
5731 | rmap_len = map->stripe_len * nr_data_stripes(map); |
5732 | } | |
a512bbf8 | 5733 | |
31e818fe | 5734 | buf = kcalloc(map->num_stripes, sizeof(u64), GFP_NOFS); |
79787eaa | 5735 | BUG_ON(!buf); /* -ENOMEM */ |
a512bbf8 YZ |
5736 | |
5737 | for (i = 0; i < map->num_stripes; i++) { | |
5738 | if (devid && map->stripes[i].dev->devid != devid) | |
5739 | continue; | |
5740 | if (map->stripes[i].physical > physical || | |
5741 | map->stripes[i].physical + length <= physical) | |
5742 | continue; | |
5743 | ||
5744 | stripe_nr = physical - map->stripes[i].physical; | |
b8b93add | 5745 | stripe_nr = div_u64(stripe_nr, map->stripe_len); |
a512bbf8 YZ |
5746 | |
5747 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
5748 | stripe_nr = stripe_nr * map->num_stripes + i; | |
b8b93add | 5749 | stripe_nr = div_u64(stripe_nr, map->sub_stripes); |
a512bbf8 YZ |
5750 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
5751 | stripe_nr = stripe_nr * map->num_stripes + i; | |
53b381b3 DW |
5752 | } /* else if RAID[56], multiply by nr_data_stripes(). |
5753 | * Alternatively, just use rmap_len below instead of | |
5754 | * map->stripe_len */ | |
5755 | ||
5756 | bytenr = chunk_start + stripe_nr * rmap_len; | |
934d375b | 5757 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
5758 | for (j = 0; j < nr; j++) { |
5759 | if (buf[j] == bytenr) | |
5760 | break; | |
5761 | } | |
934d375b CM |
5762 | if (j == nr) { |
5763 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 5764 | buf[nr++] = bytenr; |
934d375b | 5765 | } |
a512bbf8 YZ |
5766 | } |
5767 | ||
a512bbf8 YZ |
5768 | *logical = buf; |
5769 | *naddrs = nr; | |
53b381b3 | 5770 | *stripe_len = rmap_len; |
a512bbf8 YZ |
5771 | |
5772 | free_extent_map(em); | |
5773 | return 0; | |
f2d8d74d CM |
5774 | } |
5775 | ||
4246a0b6 | 5776 | static inline void btrfs_end_bbio(struct btrfs_bio *bbio, struct bio *bio) |
8408c716 | 5777 | { |
326e1dbb MS |
5778 | bio->bi_private = bbio->private; |
5779 | bio->bi_end_io = bbio->end_io; | |
4246a0b6 | 5780 | bio_endio(bio); |
326e1dbb | 5781 | |
6e9606d2 | 5782 | btrfs_put_bbio(bbio); |
8408c716 MX |
5783 | } |
5784 | ||
4246a0b6 | 5785 | static void btrfs_end_bio(struct bio *bio) |
8790d502 | 5786 | { |
9be3395b | 5787 | struct btrfs_bio *bbio = bio->bi_private; |
7d2b4daa | 5788 | int is_orig_bio = 0; |
8790d502 | 5789 | |
4246a0b6 | 5790 | if (bio->bi_error) { |
a1d3c478 | 5791 | atomic_inc(&bbio->error); |
4246a0b6 | 5792 | if (bio->bi_error == -EIO || bio->bi_error == -EREMOTEIO) { |
442a4f63 | 5793 | unsigned int stripe_index = |
9be3395b | 5794 | btrfs_io_bio(bio)->stripe_index; |
65f53338 | 5795 | struct btrfs_device *dev; |
442a4f63 SB |
5796 | |
5797 | BUG_ON(stripe_index >= bbio->num_stripes); | |
5798 | dev = bbio->stripes[stripe_index].dev; | |
597a60fa SB |
5799 | if (dev->bdev) { |
5800 | if (bio->bi_rw & WRITE) | |
5801 | btrfs_dev_stat_inc(dev, | |
5802 | BTRFS_DEV_STAT_WRITE_ERRS); | |
5803 | else | |
5804 | btrfs_dev_stat_inc(dev, | |
5805 | BTRFS_DEV_STAT_READ_ERRS); | |
5806 | if ((bio->bi_rw & WRITE_FLUSH) == WRITE_FLUSH) | |
5807 | btrfs_dev_stat_inc(dev, | |
5808 | BTRFS_DEV_STAT_FLUSH_ERRS); | |
5809 | btrfs_dev_stat_print_on_error(dev); | |
5810 | } | |
442a4f63 SB |
5811 | } |
5812 | } | |
8790d502 | 5813 | |
a1d3c478 | 5814 | if (bio == bbio->orig_bio) |
7d2b4daa CM |
5815 | is_orig_bio = 1; |
5816 | ||
c404e0dc MX |
5817 | btrfs_bio_counter_dec(bbio->fs_info); |
5818 | ||
a1d3c478 | 5819 | if (atomic_dec_and_test(&bbio->stripes_pending)) { |
7d2b4daa CM |
5820 | if (!is_orig_bio) { |
5821 | bio_put(bio); | |
a1d3c478 | 5822 | bio = bbio->orig_bio; |
7d2b4daa | 5823 | } |
c7b22bb1 | 5824 | |
9be3395b | 5825 | btrfs_io_bio(bio)->mirror_num = bbio->mirror_num; |
a236aed1 | 5826 | /* only send an error to the higher layers if it is |
53b381b3 | 5827 | * beyond the tolerance of the btrfs bio |
a236aed1 | 5828 | */ |
a1d3c478 | 5829 | if (atomic_read(&bbio->error) > bbio->max_errors) { |
4246a0b6 | 5830 | bio->bi_error = -EIO; |
5dbc8fca | 5831 | } else { |
1259ab75 CM |
5832 | /* |
5833 | * this bio is actually up to date, we didn't | |
5834 | * go over the max number of errors | |
5835 | */ | |
4246a0b6 | 5836 | bio->bi_error = 0; |
1259ab75 | 5837 | } |
c55f1396 | 5838 | |
4246a0b6 | 5839 | btrfs_end_bbio(bbio, bio); |
7d2b4daa | 5840 | } else if (!is_orig_bio) { |
8790d502 CM |
5841 | bio_put(bio); |
5842 | } | |
8790d502 CM |
5843 | } |
5844 | ||
8b712842 CM |
5845 | /* |
5846 | * see run_scheduled_bios for a description of why bios are collected for | |
5847 | * async submit. | |
5848 | * | |
5849 | * This will add one bio to the pending list for a device and make sure | |
5850 | * the work struct is scheduled. | |
5851 | */ | |
48a3b636 ES |
5852 | static noinline void btrfs_schedule_bio(struct btrfs_root *root, |
5853 | struct btrfs_device *device, | |
5854 | int rw, struct bio *bio) | |
8b712842 CM |
5855 | { |
5856 | int should_queue = 1; | |
ffbd517d | 5857 | struct btrfs_pending_bios *pending_bios; |
8b712842 | 5858 | |
53b381b3 | 5859 | if (device->missing || !device->bdev) { |
4246a0b6 | 5860 | bio_io_error(bio); |
53b381b3 DW |
5861 | return; |
5862 | } | |
5863 | ||
8b712842 | 5864 | /* don't bother with additional async steps for reads, right now */ |
7b6d91da | 5865 | if (!(rw & REQ_WRITE)) { |
492bb6de | 5866 | bio_get(bio); |
21adbd5c | 5867 | btrfsic_submit_bio(rw, bio); |
492bb6de | 5868 | bio_put(bio); |
143bede5 | 5869 | return; |
8b712842 CM |
5870 | } |
5871 | ||
5872 | /* | |
0986fe9e | 5873 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
5874 | * higher layers. Otherwise, the async bio makes it appear we have |
5875 | * made progress against dirty pages when we've really just put it | |
5876 | * on a queue for later | |
5877 | */ | |
0986fe9e | 5878 | atomic_inc(&root->fs_info->nr_async_bios); |
492bb6de | 5879 | WARN_ON(bio->bi_next); |
8b712842 CM |
5880 | bio->bi_next = NULL; |
5881 | bio->bi_rw |= rw; | |
5882 | ||
5883 | spin_lock(&device->io_lock); | |
7b6d91da | 5884 | if (bio->bi_rw & REQ_SYNC) |
ffbd517d CM |
5885 | pending_bios = &device->pending_sync_bios; |
5886 | else | |
5887 | pending_bios = &device->pending_bios; | |
8b712842 | 5888 | |
ffbd517d CM |
5889 | if (pending_bios->tail) |
5890 | pending_bios->tail->bi_next = bio; | |
8b712842 | 5891 | |
ffbd517d CM |
5892 | pending_bios->tail = bio; |
5893 | if (!pending_bios->head) | |
5894 | pending_bios->head = bio; | |
8b712842 CM |
5895 | if (device->running_pending) |
5896 | should_queue = 0; | |
5897 | ||
5898 | spin_unlock(&device->io_lock); | |
5899 | ||
5900 | if (should_queue) | |
a8c93d4e QW |
5901 | btrfs_queue_work(root->fs_info->submit_workers, |
5902 | &device->work); | |
8b712842 CM |
5903 | } |
5904 | ||
de1ee92a JB |
5905 | static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio, |
5906 | struct bio *bio, u64 physical, int dev_nr, | |
5907 | int rw, int async) | |
5908 | { | |
5909 | struct btrfs_device *dev = bbio->stripes[dev_nr].dev; | |
5910 | ||
5911 | bio->bi_private = bbio; | |
9be3395b | 5912 | btrfs_io_bio(bio)->stripe_index = dev_nr; |
de1ee92a | 5913 | bio->bi_end_io = btrfs_end_bio; |
4f024f37 | 5914 | bio->bi_iter.bi_sector = physical >> 9; |
de1ee92a JB |
5915 | #ifdef DEBUG |
5916 | { | |
5917 | struct rcu_string *name; | |
5918 | ||
5919 | rcu_read_lock(); | |
5920 | name = rcu_dereference(dev->name); | |
d1423248 | 5921 | pr_debug("btrfs_map_bio: rw %d, sector=%llu, dev=%lu " |
de1ee92a | 5922 | "(%s id %llu), size=%u\n", rw, |
1b6e4469 FF |
5923 | (u64)bio->bi_iter.bi_sector, (u_long)dev->bdev->bd_dev, |
5924 | name->str, dev->devid, bio->bi_iter.bi_size); | |
de1ee92a JB |
5925 | rcu_read_unlock(); |
5926 | } | |
5927 | #endif | |
5928 | bio->bi_bdev = dev->bdev; | |
c404e0dc MX |
5929 | |
5930 | btrfs_bio_counter_inc_noblocked(root->fs_info); | |
5931 | ||
de1ee92a | 5932 | if (async) |
53b381b3 | 5933 | btrfs_schedule_bio(root, dev, rw, bio); |
de1ee92a JB |
5934 | else |
5935 | btrfsic_submit_bio(rw, bio); | |
5936 | } | |
5937 | ||
de1ee92a JB |
5938 | static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical) |
5939 | { | |
5940 | atomic_inc(&bbio->error); | |
5941 | if (atomic_dec_and_test(&bbio->stripes_pending)) { | |
8408c716 MX |
5942 | /* Shoud be the original bio. */ |
5943 | WARN_ON(bio != bbio->orig_bio); | |
5944 | ||
9be3395b | 5945 | btrfs_io_bio(bio)->mirror_num = bbio->mirror_num; |
4f024f37 | 5946 | bio->bi_iter.bi_sector = logical >> 9; |
4246a0b6 CH |
5947 | bio->bi_error = -EIO; |
5948 | btrfs_end_bbio(bbio, bio); | |
de1ee92a JB |
5949 | } |
5950 | } | |
5951 | ||
f188591e | 5952 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 5953 | int mirror_num, int async_submit) |
0b86a832 | 5954 | { |
0b86a832 | 5955 | struct btrfs_device *dev; |
8790d502 | 5956 | struct bio *first_bio = bio; |
4f024f37 | 5957 | u64 logical = (u64)bio->bi_iter.bi_sector << 9; |
0b86a832 CM |
5958 | u64 length = 0; |
5959 | u64 map_length; | |
0b86a832 | 5960 | int ret; |
08da757d ZL |
5961 | int dev_nr; |
5962 | int total_devs; | |
a1d3c478 | 5963 | struct btrfs_bio *bbio = NULL; |
0b86a832 | 5964 | |
4f024f37 | 5965 | length = bio->bi_iter.bi_size; |
0b86a832 | 5966 | map_length = length; |
cea9e445 | 5967 | |
c404e0dc | 5968 | btrfs_bio_counter_inc_blocked(root->fs_info); |
53b381b3 | 5969 | ret = __btrfs_map_block(root->fs_info, rw, logical, &map_length, &bbio, |
8e5cfb55 | 5970 | mirror_num, 1); |
c404e0dc MX |
5971 | if (ret) { |
5972 | btrfs_bio_counter_dec(root->fs_info); | |
79787eaa | 5973 | return ret; |
c404e0dc | 5974 | } |
cea9e445 | 5975 | |
a1d3c478 | 5976 | total_devs = bbio->num_stripes; |
53b381b3 DW |
5977 | bbio->orig_bio = first_bio; |
5978 | bbio->private = first_bio->bi_private; | |
5979 | bbio->end_io = first_bio->bi_end_io; | |
c404e0dc | 5980 | bbio->fs_info = root->fs_info; |
53b381b3 DW |
5981 | atomic_set(&bbio->stripes_pending, bbio->num_stripes); |
5982 | ||
8e5cfb55 | 5983 | if (bbio->raid_map) { |
53b381b3 DW |
5984 | /* In this case, map_length has been set to the length of |
5985 | a single stripe; not the whole write */ | |
5986 | if (rw & WRITE) { | |
8e5cfb55 | 5987 | ret = raid56_parity_write(root, bio, bbio, map_length); |
53b381b3 | 5988 | } else { |
8e5cfb55 | 5989 | ret = raid56_parity_recover(root, bio, bbio, map_length, |
4245215d | 5990 | mirror_num, 1); |
53b381b3 | 5991 | } |
4245215d | 5992 | |
c404e0dc MX |
5993 | btrfs_bio_counter_dec(root->fs_info); |
5994 | return ret; | |
53b381b3 DW |
5995 | } |
5996 | ||
cea9e445 | 5997 | if (map_length < length) { |
c2cf52eb | 5998 | btrfs_crit(root->fs_info, "mapping failed logical %llu bio len %llu len %llu", |
c1c9ff7c | 5999 | logical, length, map_length); |
cea9e445 CM |
6000 | BUG(); |
6001 | } | |
a1d3c478 | 6002 | |
08da757d | 6003 | for (dev_nr = 0; dev_nr < total_devs; dev_nr++) { |
de1ee92a JB |
6004 | dev = bbio->stripes[dev_nr].dev; |
6005 | if (!dev || !dev->bdev || (rw & WRITE && !dev->writeable)) { | |
6006 | bbio_error(bbio, first_bio, logical); | |
de1ee92a JB |
6007 | continue; |
6008 | } | |
6009 | ||
a1d3c478 | 6010 | if (dev_nr < total_devs - 1) { |
9be3395b | 6011 | bio = btrfs_bio_clone(first_bio, GFP_NOFS); |
79787eaa | 6012 | BUG_ON(!bio); /* -ENOMEM */ |
326e1dbb | 6013 | } else |
a1d3c478 | 6014 | bio = first_bio; |
de1ee92a JB |
6015 | |
6016 | submit_stripe_bio(root, bbio, bio, | |
6017 | bbio->stripes[dev_nr].physical, dev_nr, rw, | |
6018 | async_submit); | |
8790d502 | 6019 | } |
c404e0dc | 6020 | btrfs_bio_counter_dec(root->fs_info); |
0b86a832 CM |
6021 | return 0; |
6022 | } | |
6023 | ||
aa1b8cd4 | 6024 | struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid, |
2b82032c | 6025 | u8 *uuid, u8 *fsid) |
0b86a832 | 6026 | { |
2b82032c YZ |
6027 | struct btrfs_device *device; |
6028 | struct btrfs_fs_devices *cur_devices; | |
6029 | ||
aa1b8cd4 | 6030 | cur_devices = fs_info->fs_devices; |
2b82032c YZ |
6031 | while (cur_devices) { |
6032 | if (!fsid || | |
6033 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
6034 | device = __find_device(&cur_devices->devices, | |
6035 | devid, uuid); | |
6036 | if (device) | |
6037 | return device; | |
6038 | } | |
6039 | cur_devices = cur_devices->seed; | |
6040 | } | |
6041 | return NULL; | |
0b86a832 CM |
6042 | } |
6043 | ||
dfe25020 | 6044 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
5f375835 | 6045 | struct btrfs_fs_devices *fs_devices, |
dfe25020 CM |
6046 | u64 devid, u8 *dev_uuid) |
6047 | { | |
6048 | struct btrfs_device *device; | |
dfe25020 | 6049 | |
12bd2fc0 ID |
6050 | device = btrfs_alloc_device(NULL, &devid, dev_uuid); |
6051 | if (IS_ERR(device)) | |
7cbd8a83 | 6052 | return NULL; |
12bd2fc0 ID |
6053 | |
6054 | list_add(&device->dev_list, &fs_devices->devices); | |
e4404d6e | 6055 | device->fs_devices = fs_devices; |
dfe25020 | 6056 | fs_devices->num_devices++; |
12bd2fc0 ID |
6057 | |
6058 | device->missing = 1; | |
cd02dca5 | 6059 | fs_devices->missing_devices++; |
12bd2fc0 | 6060 | |
dfe25020 CM |
6061 | return device; |
6062 | } | |
6063 | ||
12bd2fc0 ID |
6064 | /** |
6065 | * btrfs_alloc_device - allocate struct btrfs_device | |
6066 | * @fs_info: used only for generating a new devid, can be NULL if | |
6067 | * devid is provided (i.e. @devid != NULL). | |
6068 | * @devid: a pointer to devid for this device. If NULL a new devid | |
6069 | * is generated. | |
6070 | * @uuid: a pointer to UUID for this device. If NULL a new UUID | |
6071 | * is generated. | |
6072 | * | |
6073 | * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR() | |
6074 | * on error. Returned struct is not linked onto any lists and can be | |
6075 | * destroyed with kfree() right away. | |
6076 | */ | |
6077 | struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, | |
6078 | const u64 *devid, | |
6079 | const u8 *uuid) | |
6080 | { | |
6081 | struct btrfs_device *dev; | |
6082 | u64 tmp; | |
6083 | ||
fae7f21c | 6084 | if (WARN_ON(!devid && !fs_info)) |
12bd2fc0 | 6085 | return ERR_PTR(-EINVAL); |
12bd2fc0 ID |
6086 | |
6087 | dev = __alloc_device(); | |
6088 | if (IS_ERR(dev)) | |
6089 | return dev; | |
6090 | ||
6091 | if (devid) | |
6092 | tmp = *devid; | |
6093 | else { | |
6094 | int ret; | |
6095 | ||
6096 | ret = find_next_devid(fs_info, &tmp); | |
6097 | if (ret) { | |
6098 | kfree(dev); | |
6099 | return ERR_PTR(ret); | |
6100 | } | |
6101 | } | |
6102 | dev->devid = tmp; | |
6103 | ||
6104 | if (uuid) | |
6105 | memcpy(dev->uuid, uuid, BTRFS_UUID_SIZE); | |
6106 | else | |
6107 | generate_random_uuid(dev->uuid); | |
6108 | ||
9e0af237 LB |
6109 | btrfs_init_work(&dev->work, btrfs_submit_helper, |
6110 | pending_bios_fn, NULL, NULL); | |
12bd2fc0 ID |
6111 | |
6112 | return dev; | |
6113 | } | |
6114 | ||
0b86a832 CM |
6115 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
6116 | struct extent_buffer *leaf, | |
6117 | struct btrfs_chunk *chunk) | |
6118 | { | |
6119 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
6120 | struct map_lookup *map; | |
6121 | struct extent_map *em; | |
6122 | u64 logical; | |
6123 | u64 length; | |
6124 | u64 devid; | |
a443755f | 6125 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 6126 | int num_stripes; |
0b86a832 | 6127 | int ret; |
593060d7 | 6128 | int i; |
0b86a832 | 6129 | |
e17cade2 CM |
6130 | logical = key->offset; |
6131 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 6132 | |
890871be | 6133 | read_lock(&map_tree->map_tree.lock); |
0b86a832 | 6134 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
890871be | 6135 | read_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
6136 | |
6137 | /* already mapped? */ | |
6138 | if (em && em->start <= logical && em->start + em->len > logical) { | |
6139 | free_extent_map(em); | |
0b86a832 CM |
6140 | return 0; |
6141 | } else if (em) { | |
6142 | free_extent_map(em); | |
6143 | } | |
0b86a832 | 6144 | |
172ddd60 | 6145 | em = alloc_extent_map(); |
0b86a832 CM |
6146 | if (!em) |
6147 | return -ENOMEM; | |
593060d7 CM |
6148 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
6149 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
6150 | if (!map) { |
6151 | free_extent_map(em); | |
6152 | return -ENOMEM; | |
6153 | } | |
6154 | ||
298a8f9c | 6155 | set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags); |
0b86a832 CM |
6156 | em->bdev = (struct block_device *)map; |
6157 | em->start = logical; | |
6158 | em->len = length; | |
70c8a91c | 6159 | em->orig_start = 0; |
0b86a832 | 6160 | em->block_start = 0; |
c8b97818 | 6161 | em->block_len = em->len; |
0b86a832 | 6162 | |
593060d7 CM |
6163 | map->num_stripes = num_stripes; |
6164 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
6165 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
6166 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
6167 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
6168 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 6169 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
6170 | for (i = 0; i < num_stripes; i++) { |
6171 | map->stripes[i].physical = | |
6172 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
6173 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
6174 | read_extent_buffer(leaf, uuid, (unsigned long) |
6175 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
6176 | BTRFS_UUID_SIZE); | |
aa1b8cd4 SB |
6177 | map->stripes[i].dev = btrfs_find_device(root->fs_info, devid, |
6178 | uuid, NULL); | |
dfe25020 | 6179 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
593060d7 CM |
6180 | free_extent_map(em); |
6181 | return -EIO; | |
6182 | } | |
dfe25020 CM |
6183 | if (!map->stripes[i].dev) { |
6184 | map->stripes[i].dev = | |
5f375835 MX |
6185 | add_missing_dev(root, root->fs_info->fs_devices, |
6186 | devid, uuid); | |
dfe25020 | 6187 | if (!map->stripes[i].dev) { |
dfe25020 CM |
6188 | free_extent_map(em); |
6189 | return -EIO; | |
6190 | } | |
816fcebe AJ |
6191 | btrfs_warn(root->fs_info, "devid %llu uuid %pU is missing", |
6192 | devid, uuid); | |
dfe25020 CM |
6193 | } |
6194 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
6195 | } |
6196 | ||
890871be | 6197 | write_lock(&map_tree->map_tree.lock); |
09a2a8f9 | 6198 | ret = add_extent_mapping(&map_tree->map_tree, em, 0); |
890871be | 6199 | write_unlock(&map_tree->map_tree.lock); |
79787eaa | 6200 | BUG_ON(ret); /* Tree corruption */ |
0b86a832 CM |
6201 | free_extent_map(em); |
6202 | ||
6203 | return 0; | |
6204 | } | |
6205 | ||
143bede5 | 6206 | static void fill_device_from_item(struct extent_buffer *leaf, |
0b86a832 CM |
6207 | struct btrfs_dev_item *dev_item, |
6208 | struct btrfs_device *device) | |
6209 | { | |
6210 | unsigned long ptr; | |
0b86a832 CM |
6211 | |
6212 | device->devid = btrfs_device_id(leaf, dev_item); | |
d6397bae CB |
6213 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
6214 | device->total_bytes = device->disk_total_bytes; | |
935e5cc9 | 6215 | device->commit_total_bytes = device->disk_total_bytes; |
0b86a832 | 6216 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
ce7213c7 | 6217 | device->commit_bytes_used = device->bytes_used; |
0b86a832 CM |
6218 | device->type = btrfs_device_type(leaf, dev_item); |
6219 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
6220 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
6221 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
8dabb742 | 6222 | WARN_ON(device->devid == BTRFS_DEV_REPLACE_DEVID); |
63a212ab | 6223 | device->is_tgtdev_for_dev_replace = 0; |
0b86a832 | 6224 | |
410ba3a2 | 6225 | ptr = btrfs_device_uuid(dev_item); |
e17cade2 | 6226 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 CM |
6227 | } |
6228 | ||
5f375835 MX |
6229 | static struct btrfs_fs_devices *open_seed_devices(struct btrfs_root *root, |
6230 | u8 *fsid) | |
2b82032c YZ |
6231 | { |
6232 | struct btrfs_fs_devices *fs_devices; | |
6233 | int ret; | |
6234 | ||
b367e47f | 6235 | BUG_ON(!mutex_is_locked(&uuid_mutex)); |
2b82032c YZ |
6236 | |
6237 | fs_devices = root->fs_info->fs_devices->seed; | |
6238 | while (fs_devices) { | |
5f375835 MX |
6239 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) |
6240 | return fs_devices; | |
6241 | ||
2b82032c YZ |
6242 | fs_devices = fs_devices->seed; |
6243 | } | |
6244 | ||
6245 | fs_devices = find_fsid(fsid); | |
6246 | if (!fs_devices) { | |
5f375835 MX |
6247 | if (!btrfs_test_opt(root, DEGRADED)) |
6248 | return ERR_PTR(-ENOENT); | |
6249 | ||
6250 | fs_devices = alloc_fs_devices(fsid); | |
6251 | if (IS_ERR(fs_devices)) | |
6252 | return fs_devices; | |
6253 | ||
6254 | fs_devices->seeding = 1; | |
6255 | fs_devices->opened = 1; | |
6256 | return fs_devices; | |
2b82032c | 6257 | } |
e4404d6e YZ |
6258 | |
6259 | fs_devices = clone_fs_devices(fs_devices); | |
5f375835 MX |
6260 | if (IS_ERR(fs_devices)) |
6261 | return fs_devices; | |
2b82032c | 6262 | |
97288f2c | 6263 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
15916de8 | 6264 | root->fs_info->bdev_holder); |
48d28232 JL |
6265 | if (ret) { |
6266 | free_fs_devices(fs_devices); | |
5f375835 | 6267 | fs_devices = ERR_PTR(ret); |
2b82032c | 6268 | goto out; |
48d28232 | 6269 | } |
2b82032c YZ |
6270 | |
6271 | if (!fs_devices->seeding) { | |
6272 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 6273 | free_fs_devices(fs_devices); |
5f375835 | 6274 | fs_devices = ERR_PTR(-EINVAL); |
2b82032c YZ |
6275 | goto out; |
6276 | } | |
6277 | ||
6278 | fs_devices->seed = root->fs_info->fs_devices->seed; | |
6279 | root->fs_info->fs_devices->seed = fs_devices; | |
2b82032c | 6280 | out: |
5f375835 | 6281 | return fs_devices; |
2b82032c YZ |
6282 | } |
6283 | ||
0d81ba5d | 6284 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
6285 | struct extent_buffer *leaf, |
6286 | struct btrfs_dev_item *dev_item) | |
6287 | { | |
5f375835 | 6288 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
0b86a832 CM |
6289 | struct btrfs_device *device; |
6290 | u64 devid; | |
6291 | int ret; | |
2b82032c | 6292 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
6293 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
6294 | ||
0b86a832 | 6295 | devid = btrfs_device_id(leaf, dev_item); |
410ba3a2 | 6296 | read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item), |
a443755f | 6297 | BTRFS_UUID_SIZE); |
1473b24e | 6298 | read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item), |
2b82032c YZ |
6299 | BTRFS_UUID_SIZE); |
6300 | ||
6301 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { | |
5f375835 MX |
6302 | fs_devices = open_seed_devices(root, fs_uuid); |
6303 | if (IS_ERR(fs_devices)) | |
6304 | return PTR_ERR(fs_devices); | |
2b82032c YZ |
6305 | } |
6306 | ||
aa1b8cd4 | 6307 | device = btrfs_find_device(root->fs_info, devid, dev_uuid, fs_uuid); |
5f375835 | 6308 | if (!device) { |
e4404d6e | 6309 | if (!btrfs_test_opt(root, DEGRADED)) |
2b82032c YZ |
6310 | return -EIO; |
6311 | ||
5f375835 MX |
6312 | device = add_missing_dev(root, fs_devices, devid, dev_uuid); |
6313 | if (!device) | |
6314 | return -ENOMEM; | |
33b97e43 AJ |
6315 | btrfs_warn(root->fs_info, "devid %llu uuid %pU missing", |
6316 | devid, dev_uuid); | |
5f375835 MX |
6317 | } else { |
6318 | if (!device->bdev && !btrfs_test_opt(root, DEGRADED)) | |
6319 | return -EIO; | |
6320 | ||
6321 | if(!device->bdev && !device->missing) { | |
cd02dca5 CM |
6322 | /* |
6323 | * this happens when a device that was properly setup | |
6324 | * in the device info lists suddenly goes bad. | |
6325 | * device->bdev is NULL, and so we have to set | |
6326 | * device->missing to one here | |
6327 | */ | |
5f375835 | 6328 | device->fs_devices->missing_devices++; |
cd02dca5 | 6329 | device->missing = 1; |
2b82032c | 6330 | } |
5f375835 MX |
6331 | |
6332 | /* Move the device to its own fs_devices */ | |
6333 | if (device->fs_devices != fs_devices) { | |
6334 | ASSERT(device->missing); | |
6335 | ||
6336 | list_move(&device->dev_list, &fs_devices->devices); | |
6337 | device->fs_devices->num_devices--; | |
6338 | fs_devices->num_devices++; | |
6339 | ||
6340 | device->fs_devices->missing_devices--; | |
6341 | fs_devices->missing_devices++; | |
6342 | ||
6343 | device->fs_devices = fs_devices; | |
6344 | } | |
2b82032c YZ |
6345 | } |
6346 | ||
6347 | if (device->fs_devices != root->fs_info->fs_devices) { | |
6348 | BUG_ON(device->writeable); | |
6349 | if (device->generation != | |
6350 | btrfs_device_generation(leaf, dev_item)) | |
6351 | return -EINVAL; | |
6324fbf3 | 6352 | } |
0b86a832 CM |
6353 | |
6354 | fill_device_from_item(leaf, dev_item, device); | |
dfe25020 | 6355 | device->in_fs_metadata = 1; |
63a212ab | 6356 | if (device->writeable && !device->is_tgtdev_for_dev_replace) { |
2b82032c | 6357 | device->fs_devices->total_rw_bytes += device->total_bytes; |
2bf64758 JB |
6358 | spin_lock(&root->fs_info->free_chunk_lock); |
6359 | root->fs_info->free_chunk_space += device->total_bytes - | |
6360 | device->bytes_used; | |
6361 | spin_unlock(&root->fs_info->free_chunk_lock); | |
6362 | } | |
0b86a832 | 6363 | ret = 0; |
0b86a832 CM |
6364 | return ret; |
6365 | } | |
6366 | ||
e4404d6e | 6367 | int btrfs_read_sys_array(struct btrfs_root *root) |
0b86a832 | 6368 | { |
6c41761f | 6369 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
a061fc8d | 6370 | struct extent_buffer *sb; |
0b86a832 | 6371 | struct btrfs_disk_key *disk_key; |
0b86a832 | 6372 | struct btrfs_chunk *chunk; |
1ffb22cf DS |
6373 | u8 *array_ptr; |
6374 | unsigned long sb_array_offset; | |
84eed90f | 6375 | int ret = 0; |
0b86a832 CM |
6376 | u32 num_stripes; |
6377 | u32 array_size; | |
6378 | u32 len = 0; | |
1ffb22cf | 6379 | u32 cur_offset; |
84eed90f | 6380 | struct btrfs_key key; |
0b86a832 | 6381 | |
a83fffb7 DS |
6382 | ASSERT(BTRFS_SUPER_INFO_SIZE <= root->nodesize); |
6383 | /* | |
6384 | * This will create extent buffer of nodesize, superblock size is | |
6385 | * fixed to BTRFS_SUPER_INFO_SIZE. If nodesize > sb size, this will | |
6386 | * overallocate but we can keep it as-is, only the first page is used. | |
6387 | */ | |
6388 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET); | |
a061fc8d CM |
6389 | if (!sb) |
6390 | return -ENOMEM; | |
6391 | btrfs_set_buffer_uptodate(sb); | |
85d4e461 | 6392 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0); |
8a334426 DS |
6393 | /* |
6394 | * The sb extent buffer is artifical and just used to read the system array. | |
6395 | * btrfs_set_buffer_uptodate() call does not properly mark all it's | |
6396 | * pages up-to-date when the page is larger: extent does not cover the | |
6397 | * whole page and consequently check_page_uptodate does not find all | |
6398 | * the page's extents up-to-date (the hole beyond sb), | |
6399 | * write_extent_buffer then triggers a WARN_ON. | |
6400 | * | |
6401 | * Regular short extents go through mark_extent_buffer_dirty/writeback cycle, | |
6402 | * but sb spans only this function. Add an explicit SetPageUptodate call | |
6403 | * to silence the warning eg. on PowerPC 64. | |
6404 | */ | |
6405 | if (PAGE_CACHE_SIZE > BTRFS_SUPER_INFO_SIZE) | |
727011e0 | 6406 | SetPageUptodate(sb->pages[0]); |
4008c04a | 6407 | |
a061fc8d | 6408 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
6409 | array_size = btrfs_super_sys_array_size(super_copy); |
6410 | ||
1ffb22cf DS |
6411 | array_ptr = super_copy->sys_chunk_array; |
6412 | sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array); | |
6413 | cur_offset = 0; | |
0b86a832 | 6414 | |
1ffb22cf DS |
6415 | while (cur_offset < array_size) { |
6416 | disk_key = (struct btrfs_disk_key *)array_ptr; | |
e3540eab DS |
6417 | len = sizeof(*disk_key); |
6418 | if (cur_offset + len > array_size) | |
6419 | goto out_short_read; | |
6420 | ||
0b86a832 CM |
6421 | btrfs_disk_key_to_cpu(&key, disk_key); |
6422 | ||
1ffb22cf DS |
6423 | array_ptr += len; |
6424 | sb_array_offset += len; | |
6425 | cur_offset += len; | |
0b86a832 | 6426 | |
0d81ba5d | 6427 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
1ffb22cf | 6428 | chunk = (struct btrfs_chunk *)sb_array_offset; |
e3540eab DS |
6429 | /* |
6430 | * At least one btrfs_chunk with one stripe must be | |
6431 | * present, exact stripe count check comes afterwards | |
6432 | */ | |
6433 | len = btrfs_chunk_item_size(1); | |
6434 | if (cur_offset + len > array_size) | |
6435 | goto out_short_read; | |
6436 | ||
6437 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); | |
6438 | len = btrfs_chunk_item_size(num_stripes); | |
6439 | if (cur_offset + len > array_size) | |
6440 | goto out_short_read; | |
6441 | ||
0d81ba5d | 6442 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
6443 | if (ret) |
6444 | break; | |
0b86a832 | 6445 | } else { |
84eed90f CM |
6446 | ret = -EIO; |
6447 | break; | |
0b86a832 | 6448 | } |
1ffb22cf DS |
6449 | array_ptr += len; |
6450 | sb_array_offset += len; | |
6451 | cur_offset += len; | |
0b86a832 | 6452 | } |
a061fc8d | 6453 | free_extent_buffer(sb); |
84eed90f | 6454 | return ret; |
e3540eab DS |
6455 | |
6456 | out_short_read: | |
6457 | printk(KERN_ERR "BTRFS: sys_array too short to read %u bytes at offset %u\n", | |
6458 | len, cur_offset); | |
6459 | free_extent_buffer(sb); | |
6460 | return -EIO; | |
0b86a832 CM |
6461 | } |
6462 | ||
6463 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
6464 | { | |
6465 | struct btrfs_path *path; | |
6466 | struct extent_buffer *leaf; | |
6467 | struct btrfs_key key; | |
6468 | struct btrfs_key found_key; | |
6469 | int ret; | |
6470 | int slot; | |
6471 | ||
6472 | root = root->fs_info->chunk_root; | |
6473 | ||
6474 | path = btrfs_alloc_path(); | |
6475 | if (!path) | |
6476 | return -ENOMEM; | |
6477 | ||
b367e47f LZ |
6478 | mutex_lock(&uuid_mutex); |
6479 | lock_chunks(root); | |
6480 | ||
395927a9 FDBM |
6481 | /* |
6482 | * Read all device items, and then all the chunk items. All | |
6483 | * device items are found before any chunk item (their object id | |
6484 | * is smaller than the lowest possible object id for a chunk | |
6485 | * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID). | |
0b86a832 CM |
6486 | */ |
6487 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
6488 | key.offset = 0; | |
6489 | key.type = 0; | |
0b86a832 | 6490 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
ab59381e ZL |
6491 | if (ret < 0) |
6492 | goto error; | |
d397712b | 6493 | while (1) { |
0b86a832 CM |
6494 | leaf = path->nodes[0]; |
6495 | slot = path->slots[0]; | |
6496 | if (slot >= btrfs_header_nritems(leaf)) { | |
6497 | ret = btrfs_next_leaf(root, path); | |
6498 | if (ret == 0) | |
6499 | continue; | |
6500 | if (ret < 0) | |
6501 | goto error; | |
6502 | break; | |
6503 | } | |
6504 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
395927a9 FDBM |
6505 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { |
6506 | struct btrfs_dev_item *dev_item; | |
6507 | dev_item = btrfs_item_ptr(leaf, slot, | |
0b86a832 | 6508 | struct btrfs_dev_item); |
395927a9 FDBM |
6509 | ret = read_one_dev(root, leaf, dev_item); |
6510 | if (ret) | |
6511 | goto error; | |
0b86a832 CM |
6512 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { |
6513 | struct btrfs_chunk *chunk; | |
6514 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
6515 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2b82032c YZ |
6516 | if (ret) |
6517 | goto error; | |
0b86a832 CM |
6518 | } |
6519 | path->slots[0]++; | |
6520 | } | |
0b86a832 CM |
6521 | ret = 0; |
6522 | error: | |
b367e47f LZ |
6523 | unlock_chunks(root); |
6524 | mutex_unlock(&uuid_mutex); | |
6525 | ||
2b82032c | 6526 | btrfs_free_path(path); |
0b86a832 CM |
6527 | return ret; |
6528 | } | |
442a4f63 | 6529 | |
cb517eab MX |
6530 | void btrfs_init_devices_late(struct btrfs_fs_info *fs_info) |
6531 | { | |
6532 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6533 | struct btrfs_device *device; | |
6534 | ||
29cc83f6 LB |
6535 | while (fs_devices) { |
6536 | mutex_lock(&fs_devices->device_list_mutex); | |
6537 | list_for_each_entry(device, &fs_devices->devices, dev_list) | |
6538 | device->dev_root = fs_info->dev_root; | |
6539 | mutex_unlock(&fs_devices->device_list_mutex); | |
6540 | ||
6541 | fs_devices = fs_devices->seed; | |
6542 | } | |
cb517eab MX |
6543 | } |
6544 | ||
733f4fbb SB |
6545 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev) |
6546 | { | |
6547 | int i; | |
6548 | ||
6549 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6550 | btrfs_dev_stat_reset(dev, i); | |
6551 | } | |
6552 | ||
6553 | int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info) | |
6554 | { | |
6555 | struct btrfs_key key; | |
6556 | struct btrfs_key found_key; | |
6557 | struct btrfs_root *dev_root = fs_info->dev_root; | |
6558 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6559 | struct extent_buffer *eb; | |
6560 | int slot; | |
6561 | int ret = 0; | |
6562 | struct btrfs_device *device; | |
6563 | struct btrfs_path *path = NULL; | |
6564 | int i; | |
6565 | ||
6566 | path = btrfs_alloc_path(); | |
6567 | if (!path) { | |
6568 | ret = -ENOMEM; | |
6569 | goto out; | |
6570 | } | |
6571 | ||
6572 | mutex_lock(&fs_devices->device_list_mutex); | |
6573 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
6574 | int item_size; | |
6575 | struct btrfs_dev_stats_item *ptr; | |
6576 | ||
6577 | key.objectid = 0; | |
6578 | key.type = BTRFS_DEV_STATS_KEY; | |
6579 | key.offset = device->devid; | |
6580 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
6581 | if (ret) { | |
733f4fbb SB |
6582 | __btrfs_reset_dev_stats(device); |
6583 | device->dev_stats_valid = 1; | |
6584 | btrfs_release_path(path); | |
6585 | continue; | |
6586 | } | |
6587 | slot = path->slots[0]; | |
6588 | eb = path->nodes[0]; | |
6589 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
6590 | item_size = btrfs_item_size_nr(eb, slot); | |
6591 | ||
6592 | ptr = btrfs_item_ptr(eb, slot, | |
6593 | struct btrfs_dev_stats_item); | |
6594 | ||
6595 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { | |
6596 | if (item_size >= (1 + i) * sizeof(__le64)) | |
6597 | btrfs_dev_stat_set(device, i, | |
6598 | btrfs_dev_stats_value(eb, ptr, i)); | |
6599 | else | |
6600 | btrfs_dev_stat_reset(device, i); | |
6601 | } | |
6602 | ||
6603 | device->dev_stats_valid = 1; | |
6604 | btrfs_dev_stat_print_on_load(device); | |
6605 | btrfs_release_path(path); | |
6606 | } | |
6607 | mutex_unlock(&fs_devices->device_list_mutex); | |
6608 | ||
6609 | out: | |
6610 | btrfs_free_path(path); | |
6611 | return ret < 0 ? ret : 0; | |
6612 | } | |
6613 | ||
6614 | static int update_dev_stat_item(struct btrfs_trans_handle *trans, | |
6615 | struct btrfs_root *dev_root, | |
6616 | struct btrfs_device *device) | |
6617 | { | |
6618 | struct btrfs_path *path; | |
6619 | struct btrfs_key key; | |
6620 | struct extent_buffer *eb; | |
6621 | struct btrfs_dev_stats_item *ptr; | |
6622 | int ret; | |
6623 | int i; | |
6624 | ||
6625 | key.objectid = 0; | |
6626 | key.type = BTRFS_DEV_STATS_KEY; | |
6627 | key.offset = device->devid; | |
6628 | ||
6629 | path = btrfs_alloc_path(); | |
6630 | BUG_ON(!path); | |
6631 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
6632 | if (ret < 0) { | |
ecaeb14b DS |
6633 | btrfs_warn_in_rcu(dev_root->fs_info, |
6634 | "error %d while searching for dev_stats item for device %s", | |
606686ee | 6635 | ret, rcu_str_deref(device->name)); |
733f4fbb SB |
6636 | goto out; |
6637 | } | |
6638 | ||
6639 | if (ret == 0 && | |
6640 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
6641 | /* need to delete old one and insert a new one */ | |
6642 | ret = btrfs_del_item(trans, dev_root, path); | |
6643 | if (ret != 0) { | |
ecaeb14b DS |
6644 | btrfs_warn_in_rcu(dev_root->fs_info, |
6645 | "delete too small dev_stats item for device %s failed %d", | |
606686ee | 6646 | rcu_str_deref(device->name), ret); |
733f4fbb SB |
6647 | goto out; |
6648 | } | |
6649 | ret = 1; | |
6650 | } | |
6651 | ||
6652 | if (ret == 1) { | |
6653 | /* need to insert a new item */ | |
6654 | btrfs_release_path(path); | |
6655 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
6656 | &key, sizeof(*ptr)); | |
6657 | if (ret < 0) { | |
ecaeb14b DS |
6658 | btrfs_warn_in_rcu(dev_root->fs_info, |
6659 | "insert dev_stats item for device %s failed %d", | |
6660 | rcu_str_deref(device->name), ret); | |
733f4fbb SB |
6661 | goto out; |
6662 | } | |
6663 | } | |
6664 | ||
6665 | eb = path->nodes[0]; | |
6666 | ptr = btrfs_item_ptr(eb, path->slots[0], struct btrfs_dev_stats_item); | |
6667 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6668 | btrfs_set_dev_stats_value(eb, ptr, i, | |
6669 | btrfs_dev_stat_read(device, i)); | |
6670 | btrfs_mark_buffer_dirty(eb); | |
6671 | ||
6672 | out: | |
6673 | btrfs_free_path(path); | |
6674 | return ret; | |
6675 | } | |
6676 | ||
6677 | /* | |
6678 | * called from commit_transaction. Writes all changed device stats to disk. | |
6679 | */ | |
6680 | int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, | |
6681 | struct btrfs_fs_info *fs_info) | |
6682 | { | |
6683 | struct btrfs_root *dev_root = fs_info->dev_root; | |
6684 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6685 | struct btrfs_device *device; | |
addc3fa7 | 6686 | int stats_cnt; |
733f4fbb SB |
6687 | int ret = 0; |
6688 | ||
6689 | mutex_lock(&fs_devices->device_list_mutex); | |
6690 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
addc3fa7 | 6691 | if (!device->dev_stats_valid || !btrfs_dev_stats_dirty(device)) |
733f4fbb SB |
6692 | continue; |
6693 | ||
addc3fa7 | 6694 | stats_cnt = atomic_read(&device->dev_stats_ccnt); |
733f4fbb SB |
6695 | ret = update_dev_stat_item(trans, dev_root, device); |
6696 | if (!ret) | |
addc3fa7 | 6697 | atomic_sub(stats_cnt, &device->dev_stats_ccnt); |
733f4fbb SB |
6698 | } |
6699 | mutex_unlock(&fs_devices->device_list_mutex); | |
6700 | ||
6701 | return ret; | |
6702 | } | |
6703 | ||
442a4f63 SB |
6704 | void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index) |
6705 | { | |
6706 | btrfs_dev_stat_inc(dev, index); | |
6707 | btrfs_dev_stat_print_on_error(dev); | |
6708 | } | |
6709 | ||
48a3b636 | 6710 | static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev) |
442a4f63 | 6711 | { |
733f4fbb SB |
6712 | if (!dev->dev_stats_valid) |
6713 | return; | |
b14af3b4 DS |
6714 | btrfs_err_rl_in_rcu(dev->dev_root->fs_info, |
6715 | "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u", | |
606686ee | 6716 | rcu_str_deref(dev->name), |
442a4f63 SB |
6717 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
6718 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
6719 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
efe120a0 FH |
6720 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS), |
6721 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
442a4f63 | 6722 | } |
c11d2c23 | 6723 | |
733f4fbb SB |
6724 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev) |
6725 | { | |
a98cdb85 SB |
6726 | int i; |
6727 | ||
6728 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6729 | if (btrfs_dev_stat_read(dev, i) != 0) | |
6730 | break; | |
6731 | if (i == BTRFS_DEV_STAT_VALUES_MAX) | |
6732 | return; /* all values == 0, suppress message */ | |
6733 | ||
ecaeb14b DS |
6734 | btrfs_info_in_rcu(dev->dev_root->fs_info, |
6735 | "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u", | |
606686ee | 6736 | rcu_str_deref(dev->name), |
733f4fbb SB |
6737 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
6738 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
6739 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
6740 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS), | |
6741 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
6742 | } | |
6743 | ||
c11d2c23 | 6744 | int btrfs_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 6745 | struct btrfs_ioctl_get_dev_stats *stats) |
c11d2c23 SB |
6746 | { |
6747 | struct btrfs_device *dev; | |
6748 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
6749 | int i; | |
6750 | ||
6751 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 6752 | dev = btrfs_find_device(root->fs_info, stats->devid, NULL, NULL); |
c11d2c23 SB |
6753 | mutex_unlock(&fs_devices->device_list_mutex); |
6754 | ||
6755 | if (!dev) { | |
efe120a0 | 6756 | btrfs_warn(root->fs_info, "get dev_stats failed, device not found"); |
c11d2c23 | 6757 | return -ENODEV; |
733f4fbb | 6758 | } else if (!dev->dev_stats_valid) { |
efe120a0 | 6759 | btrfs_warn(root->fs_info, "get dev_stats failed, not yet valid"); |
733f4fbb | 6760 | return -ENODEV; |
b27f7c0c | 6761 | } else if (stats->flags & BTRFS_DEV_STATS_RESET) { |
c11d2c23 SB |
6762 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { |
6763 | if (stats->nr_items > i) | |
6764 | stats->values[i] = | |
6765 | btrfs_dev_stat_read_and_reset(dev, i); | |
6766 | else | |
6767 | btrfs_dev_stat_reset(dev, i); | |
6768 | } | |
6769 | } else { | |
6770 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6771 | if (stats->nr_items > i) | |
6772 | stats->values[i] = btrfs_dev_stat_read(dev, i); | |
6773 | } | |
6774 | if (stats->nr_items > BTRFS_DEV_STAT_VALUES_MAX) | |
6775 | stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX; | |
6776 | return 0; | |
6777 | } | |
a8a6dab7 | 6778 | |
12b1c263 | 6779 | void btrfs_scratch_superblocks(struct block_device *bdev, char *device_path) |
a8a6dab7 SB |
6780 | { |
6781 | struct buffer_head *bh; | |
6782 | struct btrfs_super_block *disk_super; | |
12b1c263 | 6783 | int copy_num; |
a8a6dab7 | 6784 | |
12b1c263 AJ |
6785 | if (!bdev) |
6786 | return; | |
a8a6dab7 | 6787 | |
12b1c263 AJ |
6788 | for (copy_num = 0; copy_num < BTRFS_SUPER_MIRROR_MAX; |
6789 | copy_num++) { | |
a8a6dab7 | 6790 | |
12b1c263 AJ |
6791 | if (btrfs_read_dev_one_super(bdev, copy_num, &bh)) |
6792 | continue; | |
6793 | ||
6794 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
6795 | ||
6796 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
6797 | set_buffer_dirty(bh); | |
6798 | sync_dirty_buffer(bh); | |
6799 | brelse(bh); | |
6800 | } | |
6801 | ||
6802 | /* Notify udev that device has changed */ | |
6803 | btrfs_kobject_uevent(bdev, KOBJ_CHANGE); | |
6804 | ||
6805 | /* Update ctime/mtime for device path for libblkid */ | |
6806 | update_dev_time(device_path); | |
a8a6dab7 | 6807 | } |
935e5cc9 MX |
6808 | |
6809 | /* | |
6810 | * Update the size of all devices, which is used for writing out the | |
6811 | * super blocks. | |
6812 | */ | |
6813 | void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info) | |
6814 | { | |
6815 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6816 | struct btrfs_device *curr, *next; | |
6817 | ||
6818 | if (list_empty(&fs_devices->resized_devices)) | |
6819 | return; | |
6820 | ||
6821 | mutex_lock(&fs_devices->device_list_mutex); | |
6822 | lock_chunks(fs_info->dev_root); | |
6823 | list_for_each_entry_safe(curr, next, &fs_devices->resized_devices, | |
6824 | resized_list) { | |
6825 | list_del_init(&curr->resized_list); | |
6826 | curr->commit_total_bytes = curr->disk_total_bytes; | |
6827 | } | |
6828 | unlock_chunks(fs_info->dev_root); | |
6829 | mutex_unlock(&fs_devices->device_list_mutex); | |
6830 | } | |
ce7213c7 MX |
6831 | |
6832 | /* Must be invoked during the transaction commit */ | |
6833 | void btrfs_update_commit_device_bytes_used(struct btrfs_root *root, | |
6834 | struct btrfs_transaction *transaction) | |
6835 | { | |
6836 | struct extent_map *em; | |
6837 | struct map_lookup *map; | |
6838 | struct btrfs_device *dev; | |
6839 | int i; | |
6840 | ||
6841 | if (list_empty(&transaction->pending_chunks)) | |
6842 | return; | |
6843 | ||
6844 | /* In order to kick the device replace finish process */ | |
6845 | lock_chunks(root); | |
6846 | list_for_each_entry(em, &transaction->pending_chunks, list) { | |
6847 | map = (struct map_lookup *)em->bdev; | |
6848 | ||
6849 | for (i = 0; i < map->num_stripes; i++) { | |
6850 | dev = map->stripes[i].dev; | |
6851 | dev->commit_bytes_used = dev->bytes_used; | |
6852 | } | |
6853 | } | |
6854 | unlock_chunks(root); | |
6855 | } | |
5a13f430 AJ |
6856 | |
6857 | void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info) | |
6858 | { | |
6859 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6860 | while (fs_devices) { | |
6861 | fs_devices->fs_info = fs_info; | |
6862 | fs_devices = fs_devices->seed; | |
6863 | } | |
6864 | } | |
6865 | ||
6866 | void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info) | |
6867 | { | |
6868 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6869 | while (fs_devices) { | |
6870 | fs_devices->fs_info = NULL; | |
6871 | fs_devices = fs_devices->seed; | |
6872 | } | |
6873 | } | |
f190aa47 AJ |
6874 | |
6875 | void btrfs_close_one_device(struct btrfs_device *device) | |
6876 | { | |
6877 | struct btrfs_fs_devices *fs_devices = device->fs_devices; | |
6878 | struct btrfs_device *new_device; | |
6879 | struct rcu_string *name; | |
6880 | ||
6881 | if (device->bdev) | |
6882 | fs_devices->open_devices--; | |
6883 | ||
6884 | if (device->writeable && | |
6885 | device->devid != BTRFS_DEV_REPLACE_DEVID) { | |
6886 | list_del_init(&device->dev_alloc_list); | |
6887 | fs_devices->rw_devices--; | |
6888 | } | |
6889 | ||
6890 | if (device->missing) | |
6891 | fs_devices->missing_devices--; | |
6892 | ||
6893 | new_device = btrfs_alloc_device(NULL, &device->devid, | |
6894 | device->uuid); | |
6895 | BUG_ON(IS_ERR(new_device)); /* -ENOMEM */ | |
6896 | ||
6897 | /* Safe because we are under uuid_mutex */ | |
6898 | if (device->name) { | |
6899 | name = rcu_string_strdup(device->name->str, GFP_NOFS); | |
6900 | BUG_ON(!name); /* -ENOMEM */ | |
6901 | rcu_assign_pointer(new_device->name, name); | |
6902 | } | |
6903 | ||
6904 | list_replace_rcu(&device->dev_list, &new_device->dev_list); | |
6905 | new_device->fs_devices = device->fs_devices; | |
6906 | ||
6907 | call_rcu(&device->rcu, free_device); | |
6908 | } |