Commit | Line | Data |
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0b86a832 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | #include <linux/sched.h> | |
19 | #include <linux/bio.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
8a4b83cc | 21 | #include <linux/buffer_head.h> |
f2d8d74d | 22 | #include <linux/blkdev.h> |
788f20eb | 23 | #include <linux/random.h> |
b765ead5 | 24 | #include <linux/iocontext.h> |
6f88a440 | 25 | #include <linux/capability.h> |
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" |
0b86a832 | 43 | |
2b82032c YZ |
44 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
45 | struct btrfs_root *root, | |
46 | struct btrfs_device *device); | |
47 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); | |
733f4fbb | 48 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev); |
48a3b636 | 49 | static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev); |
733f4fbb | 50 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *device); |
2b82032c | 51 | |
8a4b83cc CM |
52 | static DEFINE_MUTEX(uuid_mutex); |
53 | static LIST_HEAD(fs_uuids); | |
54 | ||
7d9eb12c CM |
55 | static void lock_chunks(struct btrfs_root *root) |
56 | { | |
7d9eb12c CM |
57 | mutex_lock(&root->fs_info->chunk_mutex); |
58 | } | |
59 | ||
60 | static void unlock_chunks(struct btrfs_root *root) | |
61 | { | |
7d9eb12c CM |
62 | mutex_unlock(&root->fs_info->chunk_mutex); |
63 | } | |
64 | ||
2208a378 ID |
65 | static struct btrfs_fs_devices *__alloc_fs_devices(void) |
66 | { | |
67 | struct btrfs_fs_devices *fs_devs; | |
68 | ||
69 | fs_devs = kzalloc(sizeof(*fs_devs), GFP_NOFS); | |
70 | if (!fs_devs) | |
71 | return ERR_PTR(-ENOMEM); | |
72 | ||
73 | mutex_init(&fs_devs->device_list_mutex); | |
74 | ||
75 | INIT_LIST_HEAD(&fs_devs->devices); | |
76 | INIT_LIST_HEAD(&fs_devs->alloc_list); | |
77 | INIT_LIST_HEAD(&fs_devs->list); | |
78 | ||
79 | return fs_devs; | |
80 | } | |
81 | ||
82 | /** | |
83 | * alloc_fs_devices - allocate struct btrfs_fs_devices | |
84 | * @fsid: a pointer to UUID for this FS. If NULL a new UUID is | |
85 | * generated. | |
86 | * | |
87 | * Return: a pointer to a new &struct btrfs_fs_devices on success; | |
88 | * ERR_PTR() on error. Returned struct is not linked onto any lists and | |
89 | * can be destroyed with kfree() right away. | |
90 | */ | |
91 | static struct btrfs_fs_devices *alloc_fs_devices(const u8 *fsid) | |
92 | { | |
93 | struct btrfs_fs_devices *fs_devs; | |
94 | ||
95 | fs_devs = __alloc_fs_devices(); | |
96 | if (IS_ERR(fs_devs)) | |
97 | return fs_devs; | |
98 | ||
99 | if (fsid) | |
100 | memcpy(fs_devs->fsid, fsid, BTRFS_FSID_SIZE); | |
101 | else | |
102 | generate_random_uuid(fs_devs->fsid); | |
103 | ||
104 | return fs_devs; | |
105 | } | |
106 | ||
e4404d6e YZ |
107 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
108 | { | |
109 | struct btrfs_device *device; | |
110 | WARN_ON(fs_devices->opened); | |
111 | while (!list_empty(&fs_devices->devices)) { | |
112 | device = list_entry(fs_devices->devices.next, | |
113 | struct btrfs_device, dev_list); | |
114 | list_del(&device->dev_list); | |
606686ee | 115 | rcu_string_free(device->name); |
e4404d6e YZ |
116 | kfree(device); |
117 | } | |
118 | kfree(fs_devices); | |
119 | } | |
120 | ||
b8b8ff59 LC |
121 | static void btrfs_kobject_uevent(struct block_device *bdev, |
122 | enum kobject_action action) | |
123 | { | |
124 | int ret; | |
125 | ||
126 | ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); | |
127 | if (ret) | |
efe120a0 | 128 | pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", |
b8b8ff59 LC |
129 | action, |
130 | kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), | |
131 | &disk_to_dev(bdev->bd_disk)->kobj); | |
132 | } | |
133 | ||
143bede5 | 134 | void btrfs_cleanup_fs_uuids(void) |
8a4b83cc CM |
135 | { |
136 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 137 | |
2b82032c YZ |
138 | while (!list_empty(&fs_uuids)) { |
139 | fs_devices = list_entry(fs_uuids.next, | |
140 | struct btrfs_fs_devices, list); | |
141 | list_del(&fs_devices->list); | |
e4404d6e | 142 | free_fs_devices(fs_devices); |
8a4b83cc | 143 | } |
8a4b83cc CM |
144 | } |
145 | ||
12bd2fc0 ID |
146 | static struct btrfs_device *__alloc_device(void) |
147 | { | |
148 | struct btrfs_device *dev; | |
149 | ||
150 | dev = kzalloc(sizeof(*dev), GFP_NOFS); | |
151 | if (!dev) | |
152 | return ERR_PTR(-ENOMEM); | |
153 | ||
154 | INIT_LIST_HEAD(&dev->dev_list); | |
155 | INIT_LIST_HEAD(&dev->dev_alloc_list); | |
156 | ||
157 | spin_lock_init(&dev->io_lock); | |
158 | ||
159 | spin_lock_init(&dev->reada_lock); | |
160 | atomic_set(&dev->reada_in_flight, 0); | |
161 | INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_WAIT); | |
162 | INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_WAIT); | |
163 | ||
164 | return dev; | |
165 | } | |
166 | ||
a1b32a59 CM |
167 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
168 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
169 | { |
170 | struct btrfs_device *dev; | |
8a4b83cc | 171 | |
c6e30871 | 172 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 173 | if (dev->devid == devid && |
8f18cf13 | 174 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 175 | return dev; |
a443755f | 176 | } |
8a4b83cc CM |
177 | } |
178 | return NULL; | |
179 | } | |
180 | ||
a1b32a59 | 181 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 182 | { |
8a4b83cc CM |
183 | struct btrfs_fs_devices *fs_devices; |
184 | ||
c6e30871 | 185 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
186 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
187 | return fs_devices; | |
188 | } | |
189 | return NULL; | |
190 | } | |
191 | ||
beaf8ab3 SB |
192 | static int |
193 | btrfs_get_bdev_and_sb(const char *device_path, fmode_t flags, void *holder, | |
194 | int flush, struct block_device **bdev, | |
195 | struct buffer_head **bh) | |
196 | { | |
197 | int ret; | |
198 | ||
199 | *bdev = blkdev_get_by_path(device_path, flags, holder); | |
200 | ||
201 | if (IS_ERR(*bdev)) { | |
202 | ret = PTR_ERR(*bdev); | |
efe120a0 | 203 | printk(KERN_INFO "BTRFS: open %s failed\n", device_path); |
beaf8ab3 SB |
204 | goto error; |
205 | } | |
206 | ||
207 | if (flush) | |
208 | filemap_write_and_wait((*bdev)->bd_inode->i_mapping); | |
209 | ret = set_blocksize(*bdev, 4096); | |
210 | if (ret) { | |
211 | blkdev_put(*bdev, flags); | |
212 | goto error; | |
213 | } | |
214 | invalidate_bdev(*bdev); | |
215 | *bh = btrfs_read_dev_super(*bdev); | |
216 | if (!*bh) { | |
217 | ret = -EINVAL; | |
218 | blkdev_put(*bdev, flags); | |
219 | goto error; | |
220 | } | |
221 | ||
222 | return 0; | |
223 | ||
224 | error: | |
225 | *bdev = NULL; | |
226 | *bh = NULL; | |
227 | return ret; | |
228 | } | |
229 | ||
ffbd517d CM |
230 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
231 | struct bio *head, struct bio *tail) | |
232 | { | |
233 | ||
234 | struct bio *old_head; | |
235 | ||
236 | old_head = pending_bios->head; | |
237 | pending_bios->head = head; | |
238 | if (pending_bios->tail) | |
239 | tail->bi_next = old_head; | |
240 | else | |
241 | pending_bios->tail = tail; | |
242 | } | |
243 | ||
8b712842 CM |
244 | /* |
245 | * we try to collect pending bios for a device so we don't get a large | |
246 | * number of procs sending bios down to the same device. This greatly | |
247 | * improves the schedulers ability to collect and merge the bios. | |
248 | * | |
249 | * But, it also turns into a long list of bios to process and that is sure | |
250 | * to eventually make the worker thread block. The solution here is to | |
251 | * make some progress and then put this work struct back at the end of | |
252 | * the list if the block device is congested. This way, multiple devices | |
253 | * can make progress from a single worker thread. | |
254 | */ | |
143bede5 | 255 | static noinline void run_scheduled_bios(struct btrfs_device *device) |
8b712842 CM |
256 | { |
257 | struct bio *pending; | |
258 | struct backing_dev_info *bdi; | |
b64a2851 | 259 | struct btrfs_fs_info *fs_info; |
ffbd517d | 260 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
261 | struct bio *tail; |
262 | struct bio *cur; | |
263 | int again = 0; | |
ffbd517d | 264 | unsigned long num_run; |
d644d8a1 | 265 | unsigned long batch_run = 0; |
b64a2851 | 266 | unsigned long limit; |
b765ead5 | 267 | unsigned long last_waited = 0; |
d84275c9 | 268 | int force_reg = 0; |
0e588859 | 269 | int sync_pending = 0; |
211588ad CM |
270 | struct blk_plug plug; |
271 | ||
272 | /* | |
273 | * this function runs all the bios we've collected for | |
274 | * a particular device. We don't want to wander off to | |
275 | * another device without first sending all of these down. | |
276 | * So, setup a plug here and finish it off before we return | |
277 | */ | |
278 | blk_start_plug(&plug); | |
8b712842 | 279 | |
bedf762b | 280 | bdi = blk_get_backing_dev_info(device->bdev); |
b64a2851 CM |
281 | fs_info = device->dev_root->fs_info; |
282 | limit = btrfs_async_submit_limit(fs_info); | |
283 | limit = limit * 2 / 3; | |
284 | ||
8b712842 CM |
285 | loop: |
286 | spin_lock(&device->io_lock); | |
287 | ||
a6837051 | 288 | loop_lock: |
d84275c9 | 289 | num_run = 0; |
ffbd517d | 290 | |
8b712842 CM |
291 | /* take all the bios off the list at once and process them |
292 | * later on (without the lock held). But, remember the | |
293 | * tail and other pointers so the bios can be properly reinserted | |
294 | * into the list if we hit congestion | |
295 | */ | |
d84275c9 | 296 | if (!force_reg && device->pending_sync_bios.head) { |
ffbd517d | 297 | pending_bios = &device->pending_sync_bios; |
d84275c9 CM |
298 | force_reg = 1; |
299 | } else { | |
ffbd517d | 300 | pending_bios = &device->pending_bios; |
d84275c9 CM |
301 | force_reg = 0; |
302 | } | |
ffbd517d CM |
303 | |
304 | pending = pending_bios->head; | |
305 | tail = pending_bios->tail; | |
8b712842 | 306 | WARN_ON(pending && !tail); |
8b712842 CM |
307 | |
308 | /* | |
309 | * if pending was null this time around, no bios need processing | |
310 | * at all and we can stop. Otherwise it'll loop back up again | |
311 | * and do an additional check so no bios are missed. | |
312 | * | |
313 | * device->running_pending is used to synchronize with the | |
314 | * schedule_bio code. | |
315 | */ | |
ffbd517d CM |
316 | if (device->pending_sync_bios.head == NULL && |
317 | device->pending_bios.head == NULL) { | |
8b712842 CM |
318 | again = 0; |
319 | device->running_pending = 0; | |
ffbd517d CM |
320 | } else { |
321 | again = 1; | |
322 | device->running_pending = 1; | |
8b712842 | 323 | } |
ffbd517d CM |
324 | |
325 | pending_bios->head = NULL; | |
326 | pending_bios->tail = NULL; | |
327 | ||
8b712842 CM |
328 | spin_unlock(&device->io_lock); |
329 | ||
d397712b | 330 | while (pending) { |
ffbd517d CM |
331 | |
332 | rmb(); | |
d84275c9 CM |
333 | /* we want to work on both lists, but do more bios on the |
334 | * sync list than the regular list | |
335 | */ | |
336 | if ((num_run > 32 && | |
337 | pending_bios != &device->pending_sync_bios && | |
338 | device->pending_sync_bios.head) || | |
339 | (num_run > 64 && pending_bios == &device->pending_sync_bios && | |
340 | device->pending_bios.head)) { | |
ffbd517d CM |
341 | spin_lock(&device->io_lock); |
342 | requeue_list(pending_bios, pending, tail); | |
343 | goto loop_lock; | |
344 | } | |
345 | ||
8b712842 CM |
346 | cur = pending; |
347 | pending = pending->bi_next; | |
348 | cur->bi_next = NULL; | |
b64a2851 | 349 | |
66657b31 | 350 | if (atomic_dec_return(&fs_info->nr_async_bios) < limit && |
b64a2851 CM |
351 | waitqueue_active(&fs_info->async_submit_wait)) |
352 | wake_up(&fs_info->async_submit_wait); | |
492bb6de CM |
353 | |
354 | BUG_ON(atomic_read(&cur->bi_cnt) == 0); | |
d644d8a1 | 355 | |
2ab1ba68 CM |
356 | /* |
357 | * if we're doing the sync list, record that our | |
358 | * plug has some sync requests on it | |
359 | * | |
360 | * If we're doing the regular list and there are | |
361 | * sync requests sitting around, unplug before | |
362 | * we add more | |
363 | */ | |
364 | if (pending_bios == &device->pending_sync_bios) { | |
365 | sync_pending = 1; | |
366 | } else if (sync_pending) { | |
367 | blk_finish_plug(&plug); | |
368 | blk_start_plug(&plug); | |
369 | sync_pending = 0; | |
370 | } | |
371 | ||
21adbd5c | 372 | btrfsic_submit_bio(cur->bi_rw, cur); |
5ff7ba3a CM |
373 | num_run++; |
374 | batch_run++; | |
7eaceacc | 375 | if (need_resched()) |
ffbd517d | 376 | cond_resched(); |
8b712842 CM |
377 | |
378 | /* | |
379 | * we made progress, there is more work to do and the bdi | |
380 | * is now congested. Back off and let other work structs | |
381 | * run instead | |
382 | */ | |
57fd5a5f | 383 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
5f2cc086 | 384 | fs_info->fs_devices->open_devices > 1) { |
b765ead5 | 385 | struct io_context *ioc; |
8b712842 | 386 | |
b765ead5 CM |
387 | ioc = current->io_context; |
388 | ||
389 | /* | |
390 | * the main goal here is that we don't want to | |
391 | * block if we're going to be able to submit | |
392 | * more requests without blocking. | |
393 | * | |
394 | * This code does two great things, it pokes into | |
395 | * the elevator code from a filesystem _and_ | |
396 | * it makes assumptions about how batching works. | |
397 | */ | |
398 | if (ioc && ioc->nr_batch_requests > 0 && | |
399 | time_before(jiffies, ioc->last_waited + HZ/50UL) && | |
400 | (last_waited == 0 || | |
401 | ioc->last_waited == last_waited)) { | |
402 | /* | |
403 | * we want to go through our batch of | |
404 | * requests and stop. So, we copy out | |
405 | * the ioc->last_waited time and test | |
406 | * against it before looping | |
407 | */ | |
408 | last_waited = ioc->last_waited; | |
7eaceacc | 409 | if (need_resched()) |
ffbd517d | 410 | cond_resched(); |
b765ead5 CM |
411 | continue; |
412 | } | |
8b712842 | 413 | spin_lock(&device->io_lock); |
ffbd517d | 414 | requeue_list(pending_bios, pending, tail); |
a6837051 | 415 | device->running_pending = 1; |
8b712842 CM |
416 | |
417 | spin_unlock(&device->io_lock); | |
a8c93d4e QW |
418 | btrfs_queue_work(fs_info->submit_workers, |
419 | &device->work); | |
8b712842 CM |
420 | goto done; |
421 | } | |
d85c8a6f CM |
422 | /* unplug every 64 requests just for good measure */ |
423 | if (batch_run % 64 == 0) { | |
424 | blk_finish_plug(&plug); | |
425 | blk_start_plug(&plug); | |
426 | sync_pending = 0; | |
427 | } | |
8b712842 | 428 | } |
ffbd517d | 429 | |
51684082 CM |
430 | cond_resched(); |
431 | if (again) | |
432 | goto loop; | |
433 | ||
434 | spin_lock(&device->io_lock); | |
435 | if (device->pending_bios.head || device->pending_sync_bios.head) | |
436 | goto loop_lock; | |
437 | spin_unlock(&device->io_lock); | |
438 | ||
8b712842 | 439 | done: |
211588ad | 440 | blk_finish_plug(&plug); |
8b712842 CM |
441 | } |
442 | ||
d458b054 | 443 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
444 | { |
445 | struct btrfs_device *device; | |
446 | ||
447 | device = container_of(work, struct btrfs_device, work); | |
448 | run_scheduled_bios(device); | |
449 | } | |
450 | ||
60999ca4 DS |
451 | /* |
452 | * Add new device to list of registered devices | |
453 | * | |
454 | * Returns: | |
455 | * 1 - first time device is seen | |
456 | * 0 - device already known | |
457 | * < 0 - error | |
458 | */ | |
a1b32a59 | 459 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
460 | struct btrfs_super_block *disk_super, |
461 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
462 | { | |
463 | struct btrfs_device *device; | |
464 | struct btrfs_fs_devices *fs_devices; | |
606686ee | 465 | struct rcu_string *name; |
60999ca4 | 466 | int ret = 0; |
8a4b83cc CM |
467 | u64 found_transid = btrfs_super_generation(disk_super); |
468 | ||
469 | fs_devices = find_fsid(disk_super->fsid); | |
470 | if (!fs_devices) { | |
2208a378 ID |
471 | fs_devices = alloc_fs_devices(disk_super->fsid); |
472 | if (IS_ERR(fs_devices)) | |
473 | return PTR_ERR(fs_devices); | |
474 | ||
8a4b83cc | 475 | list_add(&fs_devices->list, &fs_uuids); |
8a4b83cc CM |
476 | fs_devices->latest_devid = devid; |
477 | fs_devices->latest_trans = found_transid; | |
2208a378 | 478 | |
8a4b83cc CM |
479 | device = NULL; |
480 | } else { | |
a443755f CM |
481 | device = __find_device(&fs_devices->devices, devid, |
482 | disk_super->dev_item.uuid); | |
8a4b83cc CM |
483 | } |
484 | if (!device) { | |
2b82032c YZ |
485 | if (fs_devices->opened) |
486 | return -EBUSY; | |
487 | ||
12bd2fc0 ID |
488 | device = btrfs_alloc_device(NULL, &devid, |
489 | disk_super->dev_item.uuid); | |
490 | if (IS_ERR(device)) { | |
8a4b83cc | 491 | /* we can safely leave the fs_devices entry around */ |
12bd2fc0 | 492 | return PTR_ERR(device); |
8a4b83cc | 493 | } |
606686ee JB |
494 | |
495 | name = rcu_string_strdup(path, GFP_NOFS); | |
496 | if (!name) { | |
8a4b83cc CM |
497 | kfree(device); |
498 | return -ENOMEM; | |
499 | } | |
606686ee | 500 | rcu_assign_pointer(device->name, name); |
90519d66 | 501 | |
e5e9a520 | 502 | mutex_lock(&fs_devices->device_list_mutex); |
1f78160c | 503 | list_add_rcu(&device->dev_list, &fs_devices->devices); |
f7171750 | 504 | fs_devices->num_devices++; |
e5e9a520 CM |
505 | mutex_unlock(&fs_devices->device_list_mutex); |
506 | ||
60999ca4 | 507 | ret = 1; |
2b82032c | 508 | device->fs_devices = fs_devices; |
606686ee JB |
509 | } else if (!device->name || strcmp(device->name->str, path)) { |
510 | name = rcu_string_strdup(path, GFP_NOFS); | |
3a0524dc TH |
511 | if (!name) |
512 | return -ENOMEM; | |
606686ee JB |
513 | rcu_string_free(device->name); |
514 | rcu_assign_pointer(device->name, name); | |
cd02dca5 CM |
515 | if (device->missing) { |
516 | fs_devices->missing_devices--; | |
517 | device->missing = 0; | |
518 | } | |
8a4b83cc CM |
519 | } |
520 | ||
521 | if (found_transid > fs_devices->latest_trans) { | |
522 | fs_devices->latest_devid = devid; | |
523 | fs_devices->latest_trans = found_transid; | |
524 | } | |
8a4b83cc | 525 | *fs_devices_ret = fs_devices; |
60999ca4 DS |
526 | |
527 | return ret; | |
8a4b83cc CM |
528 | } |
529 | ||
e4404d6e YZ |
530 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
531 | { | |
532 | struct btrfs_fs_devices *fs_devices; | |
533 | struct btrfs_device *device; | |
534 | struct btrfs_device *orig_dev; | |
535 | ||
2208a378 ID |
536 | fs_devices = alloc_fs_devices(orig->fsid); |
537 | if (IS_ERR(fs_devices)) | |
538 | return fs_devices; | |
e4404d6e | 539 | |
e4404d6e YZ |
540 | fs_devices->latest_devid = orig->latest_devid; |
541 | fs_devices->latest_trans = orig->latest_trans; | |
02db0844 | 542 | fs_devices->total_devices = orig->total_devices; |
e4404d6e | 543 | |
46224705 | 544 | /* We have held the volume lock, it is safe to get the devices. */ |
e4404d6e | 545 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
606686ee JB |
546 | struct rcu_string *name; |
547 | ||
12bd2fc0 ID |
548 | device = btrfs_alloc_device(NULL, &orig_dev->devid, |
549 | orig_dev->uuid); | |
550 | if (IS_ERR(device)) | |
e4404d6e YZ |
551 | goto error; |
552 | ||
606686ee JB |
553 | /* |
554 | * This is ok to do without rcu read locked because we hold the | |
555 | * uuid mutex so nothing we touch in here is going to disappear. | |
556 | */ | |
557 | name = rcu_string_strdup(orig_dev->name->str, GFP_NOFS); | |
558 | if (!name) { | |
fd2696f3 | 559 | kfree(device); |
e4404d6e | 560 | goto error; |
fd2696f3 | 561 | } |
606686ee | 562 | rcu_assign_pointer(device->name, name); |
e4404d6e | 563 | |
e4404d6e YZ |
564 | list_add(&device->dev_list, &fs_devices->devices); |
565 | device->fs_devices = fs_devices; | |
566 | fs_devices->num_devices++; | |
567 | } | |
568 | return fs_devices; | |
569 | error: | |
570 | free_fs_devices(fs_devices); | |
571 | return ERR_PTR(-ENOMEM); | |
572 | } | |
573 | ||
8dabb742 SB |
574 | void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info, |
575 | struct btrfs_fs_devices *fs_devices, int step) | |
dfe25020 | 576 | { |
c6e30871 | 577 | struct btrfs_device *device, *next; |
dfe25020 | 578 | |
a6b0d5c8 CM |
579 | struct block_device *latest_bdev = NULL; |
580 | u64 latest_devid = 0; | |
581 | u64 latest_transid = 0; | |
582 | ||
dfe25020 CM |
583 | mutex_lock(&uuid_mutex); |
584 | again: | |
46224705 | 585 | /* This is the initialized path, it is safe to release the devices. */ |
c6e30871 | 586 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
a6b0d5c8 | 587 | if (device->in_fs_metadata) { |
63a212ab SB |
588 | if (!device->is_tgtdev_for_dev_replace && |
589 | (!latest_transid || | |
590 | device->generation > latest_transid)) { | |
a6b0d5c8 CM |
591 | latest_devid = device->devid; |
592 | latest_transid = device->generation; | |
593 | latest_bdev = device->bdev; | |
594 | } | |
2b82032c | 595 | continue; |
a6b0d5c8 | 596 | } |
2b82032c | 597 | |
8dabb742 SB |
598 | if (device->devid == BTRFS_DEV_REPLACE_DEVID) { |
599 | /* | |
600 | * In the first step, keep the device which has | |
601 | * the correct fsid and the devid that is used | |
602 | * for the dev_replace procedure. | |
603 | * In the second step, the dev_replace state is | |
604 | * read from the device tree and it is known | |
605 | * whether the procedure is really active or | |
606 | * not, which means whether this device is | |
607 | * used or whether it should be removed. | |
608 | */ | |
609 | if (step == 0 || device->is_tgtdev_for_dev_replace) { | |
610 | continue; | |
611 | } | |
612 | } | |
2b82032c | 613 | if (device->bdev) { |
d4d77629 | 614 | blkdev_put(device->bdev, device->mode); |
2b82032c YZ |
615 | device->bdev = NULL; |
616 | fs_devices->open_devices--; | |
617 | } | |
618 | if (device->writeable) { | |
619 | list_del_init(&device->dev_alloc_list); | |
620 | device->writeable = 0; | |
8dabb742 SB |
621 | if (!device->is_tgtdev_for_dev_replace) |
622 | fs_devices->rw_devices--; | |
2b82032c | 623 | } |
e4404d6e YZ |
624 | list_del_init(&device->dev_list); |
625 | fs_devices->num_devices--; | |
606686ee | 626 | rcu_string_free(device->name); |
e4404d6e | 627 | kfree(device); |
dfe25020 | 628 | } |
2b82032c YZ |
629 | |
630 | if (fs_devices->seed) { | |
631 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
632 | goto again; |
633 | } | |
634 | ||
a6b0d5c8 CM |
635 | fs_devices->latest_bdev = latest_bdev; |
636 | fs_devices->latest_devid = latest_devid; | |
637 | fs_devices->latest_trans = latest_transid; | |
638 | ||
dfe25020 | 639 | mutex_unlock(&uuid_mutex); |
dfe25020 | 640 | } |
a0af469b | 641 | |
1f78160c XG |
642 | static void __free_device(struct work_struct *work) |
643 | { | |
644 | struct btrfs_device *device; | |
645 | ||
646 | device = container_of(work, struct btrfs_device, rcu_work); | |
647 | ||
648 | if (device->bdev) | |
649 | blkdev_put(device->bdev, device->mode); | |
650 | ||
606686ee | 651 | rcu_string_free(device->name); |
1f78160c XG |
652 | kfree(device); |
653 | } | |
654 | ||
655 | static void free_device(struct rcu_head *head) | |
656 | { | |
657 | struct btrfs_device *device; | |
658 | ||
659 | device = container_of(head, struct btrfs_device, rcu); | |
660 | ||
661 | INIT_WORK(&device->rcu_work, __free_device); | |
662 | schedule_work(&device->rcu_work); | |
663 | } | |
664 | ||
2b82032c | 665 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 666 | { |
8a4b83cc | 667 | struct btrfs_device *device; |
e4404d6e | 668 | |
2b82032c YZ |
669 | if (--fs_devices->opened > 0) |
670 | return 0; | |
8a4b83cc | 671 | |
c9513edb | 672 | mutex_lock(&fs_devices->device_list_mutex); |
c6e30871 | 673 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
1f78160c | 674 | struct btrfs_device *new_device; |
606686ee | 675 | struct rcu_string *name; |
1f78160c XG |
676 | |
677 | if (device->bdev) | |
a0af469b | 678 | fs_devices->open_devices--; |
1f78160c | 679 | |
f747cab7 ID |
680 | if (device->writeable && |
681 | device->devid != BTRFS_DEV_REPLACE_DEVID) { | |
2b82032c YZ |
682 | list_del_init(&device->dev_alloc_list); |
683 | fs_devices->rw_devices--; | |
684 | } | |
685 | ||
d5e2003c JB |
686 | if (device->can_discard) |
687 | fs_devices->num_can_discard--; | |
726551eb JB |
688 | if (device->missing) |
689 | fs_devices->missing_devices--; | |
d5e2003c | 690 | |
a1e8780a ID |
691 | new_device = btrfs_alloc_device(NULL, &device->devid, |
692 | device->uuid); | |
693 | BUG_ON(IS_ERR(new_device)); /* -ENOMEM */ | |
606686ee JB |
694 | |
695 | /* Safe because we are under uuid_mutex */ | |
99f5944b JB |
696 | if (device->name) { |
697 | name = rcu_string_strdup(device->name->str, GFP_NOFS); | |
a1e8780a | 698 | BUG_ON(!name); /* -ENOMEM */ |
99f5944b JB |
699 | rcu_assign_pointer(new_device->name, name); |
700 | } | |
a1e8780a | 701 | |
1f78160c | 702 | list_replace_rcu(&device->dev_list, &new_device->dev_list); |
a1e8780a | 703 | new_device->fs_devices = device->fs_devices; |
1f78160c XG |
704 | |
705 | call_rcu(&device->rcu, free_device); | |
8a4b83cc | 706 | } |
c9513edb XG |
707 | mutex_unlock(&fs_devices->device_list_mutex); |
708 | ||
e4404d6e YZ |
709 | WARN_ON(fs_devices->open_devices); |
710 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
711 | fs_devices->opened = 0; |
712 | fs_devices->seeding = 0; | |
2b82032c | 713 | |
8a4b83cc CM |
714 | return 0; |
715 | } | |
716 | ||
2b82032c YZ |
717 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
718 | { | |
e4404d6e | 719 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
720 | int ret; |
721 | ||
722 | mutex_lock(&uuid_mutex); | |
723 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
724 | if (!fs_devices->opened) { |
725 | seed_devices = fs_devices->seed; | |
726 | fs_devices->seed = NULL; | |
727 | } | |
2b82032c | 728 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
729 | |
730 | while (seed_devices) { | |
731 | fs_devices = seed_devices; | |
732 | seed_devices = fs_devices->seed; | |
733 | __btrfs_close_devices(fs_devices); | |
734 | free_fs_devices(fs_devices); | |
735 | } | |
bc178622 ES |
736 | /* |
737 | * Wait for rcu kworkers under __btrfs_close_devices | |
738 | * to finish all blkdev_puts so device is really | |
739 | * free when umount is done. | |
740 | */ | |
741 | rcu_barrier(); | |
2b82032c YZ |
742 | return ret; |
743 | } | |
744 | ||
e4404d6e YZ |
745 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
746 | fmode_t flags, void *holder) | |
8a4b83cc | 747 | { |
d5e2003c | 748 | struct request_queue *q; |
8a4b83cc CM |
749 | struct block_device *bdev; |
750 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 751 | struct btrfs_device *device; |
a0af469b CM |
752 | struct block_device *latest_bdev = NULL; |
753 | struct buffer_head *bh; | |
754 | struct btrfs_super_block *disk_super; | |
755 | u64 latest_devid = 0; | |
756 | u64 latest_transid = 0; | |
a0af469b | 757 | u64 devid; |
2b82032c | 758 | int seeding = 1; |
a0af469b | 759 | int ret = 0; |
8a4b83cc | 760 | |
d4d77629 TH |
761 | flags |= FMODE_EXCL; |
762 | ||
c6e30871 | 763 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
764 | if (device->bdev) |
765 | continue; | |
dfe25020 CM |
766 | if (!device->name) |
767 | continue; | |
768 | ||
f63e0cca ES |
769 | /* Just open everything we can; ignore failures here */ |
770 | if (btrfs_get_bdev_and_sb(device->name->str, flags, holder, 1, | |
771 | &bdev, &bh)) | |
beaf8ab3 | 772 | continue; |
a0af469b CM |
773 | |
774 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 775 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
a0af469b CM |
776 | if (devid != device->devid) |
777 | goto error_brelse; | |
778 | ||
2b82032c YZ |
779 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
780 | BTRFS_UUID_SIZE)) | |
781 | goto error_brelse; | |
782 | ||
783 | device->generation = btrfs_super_generation(disk_super); | |
784 | if (!latest_transid || device->generation > latest_transid) { | |
a0af469b | 785 | latest_devid = devid; |
2b82032c | 786 | latest_transid = device->generation; |
a0af469b CM |
787 | latest_bdev = bdev; |
788 | } | |
789 | ||
2b82032c YZ |
790 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
791 | device->writeable = 0; | |
792 | } else { | |
793 | device->writeable = !bdev_read_only(bdev); | |
794 | seeding = 0; | |
795 | } | |
796 | ||
d5e2003c JB |
797 | q = bdev_get_queue(bdev); |
798 | if (blk_queue_discard(q)) { | |
799 | device->can_discard = 1; | |
800 | fs_devices->num_can_discard++; | |
801 | } | |
802 | ||
8a4b83cc | 803 | device->bdev = bdev; |
dfe25020 | 804 | device->in_fs_metadata = 0; |
15916de8 CM |
805 | device->mode = flags; |
806 | ||
c289811c CM |
807 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
808 | fs_devices->rotating = 1; | |
809 | ||
a0af469b | 810 | fs_devices->open_devices++; |
55e50e45 ID |
811 | if (device->writeable && |
812 | device->devid != BTRFS_DEV_REPLACE_DEVID) { | |
2b82032c YZ |
813 | fs_devices->rw_devices++; |
814 | list_add(&device->dev_alloc_list, | |
815 | &fs_devices->alloc_list); | |
816 | } | |
4f6c9328 | 817 | brelse(bh); |
a0af469b | 818 | continue; |
a061fc8d | 819 | |
a0af469b CM |
820 | error_brelse: |
821 | brelse(bh); | |
d4d77629 | 822 | blkdev_put(bdev, flags); |
a0af469b | 823 | continue; |
8a4b83cc | 824 | } |
a0af469b | 825 | if (fs_devices->open_devices == 0) { |
20bcd649 | 826 | ret = -EINVAL; |
a0af469b CM |
827 | goto out; |
828 | } | |
2b82032c YZ |
829 | fs_devices->seeding = seeding; |
830 | fs_devices->opened = 1; | |
a0af469b CM |
831 | fs_devices->latest_bdev = latest_bdev; |
832 | fs_devices->latest_devid = latest_devid; | |
833 | fs_devices->latest_trans = latest_transid; | |
2b82032c | 834 | fs_devices->total_rw_bytes = 0; |
a0af469b | 835 | out: |
2b82032c YZ |
836 | return ret; |
837 | } | |
838 | ||
839 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 840 | fmode_t flags, void *holder) |
2b82032c YZ |
841 | { |
842 | int ret; | |
843 | ||
844 | mutex_lock(&uuid_mutex); | |
845 | if (fs_devices->opened) { | |
e4404d6e YZ |
846 | fs_devices->opened++; |
847 | ret = 0; | |
2b82032c | 848 | } else { |
15916de8 | 849 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 850 | } |
8a4b83cc | 851 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
852 | return ret; |
853 | } | |
854 | ||
6f60cbd3 DS |
855 | /* |
856 | * Look for a btrfs signature on a device. This may be called out of the mount path | |
857 | * and we are not allowed to call set_blocksize during the scan. The superblock | |
858 | * is read via pagecache | |
859 | */ | |
97288f2c | 860 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
861 | struct btrfs_fs_devices **fs_devices_ret) |
862 | { | |
863 | struct btrfs_super_block *disk_super; | |
864 | struct block_device *bdev; | |
6f60cbd3 DS |
865 | struct page *page; |
866 | void *p; | |
867 | int ret = -EINVAL; | |
8a4b83cc | 868 | u64 devid; |
f2984462 | 869 | u64 transid; |
02db0844 | 870 | u64 total_devices; |
6f60cbd3 DS |
871 | u64 bytenr; |
872 | pgoff_t index; | |
8a4b83cc | 873 | |
6f60cbd3 DS |
874 | /* |
875 | * we would like to check all the supers, but that would make | |
876 | * a btrfs mount succeed after a mkfs from a different FS. | |
877 | * So, we need to add a special mount option to scan for | |
878 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead | |
879 | */ | |
880 | bytenr = btrfs_sb_offset(0); | |
d4d77629 | 881 | flags |= FMODE_EXCL; |
10f6327b | 882 | mutex_lock(&uuid_mutex); |
6f60cbd3 DS |
883 | |
884 | bdev = blkdev_get_by_path(path, flags, holder); | |
885 | ||
886 | if (IS_ERR(bdev)) { | |
887 | ret = PTR_ERR(bdev); | |
beaf8ab3 | 888 | goto error; |
6f60cbd3 DS |
889 | } |
890 | ||
891 | /* make sure our super fits in the device */ | |
892 | if (bytenr + PAGE_CACHE_SIZE >= i_size_read(bdev->bd_inode)) | |
893 | goto error_bdev_put; | |
894 | ||
895 | /* make sure our super fits in the page */ | |
896 | if (sizeof(*disk_super) > PAGE_CACHE_SIZE) | |
897 | goto error_bdev_put; | |
898 | ||
899 | /* make sure our super doesn't straddle pages on disk */ | |
900 | index = bytenr >> PAGE_CACHE_SHIFT; | |
901 | if ((bytenr + sizeof(*disk_super) - 1) >> PAGE_CACHE_SHIFT != index) | |
902 | goto error_bdev_put; | |
903 | ||
904 | /* pull in the page with our super */ | |
905 | page = read_cache_page_gfp(bdev->bd_inode->i_mapping, | |
906 | index, GFP_NOFS); | |
907 | ||
908 | if (IS_ERR_OR_NULL(page)) | |
909 | goto error_bdev_put; | |
910 | ||
911 | p = kmap(page); | |
912 | ||
913 | /* align our pointer to the offset of the super block */ | |
914 | disk_super = p + (bytenr & ~PAGE_CACHE_MASK); | |
915 | ||
916 | if (btrfs_super_bytenr(disk_super) != bytenr || | |
3cae210f | 917 | btrfs_super_magic(disk_super) != BTRFS_MAGIC) |
6f60cbd3 DS |
918 | goto error_unmap; |
919 | ||
a343832f | 920 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
f2984462 | 921 | transid = btrfs_super_generation(disk_super); |
02db0844 | 922 | total_devices = btrfs_super_num_devices(disk_super); |
6f60cbd3 | 923 | |
8a4b83cc | 924 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
60999ca4 DS |
925 | if (ret > 0) { |
926 | if (disk_super->label[0]) { | |
927 | if (disk_super->label[BTRFS_LABEL_SIZE - 1]) | |
928 | disk_super->label[BTRFS_LABEL_SIZE - 1] = '\0'; | |
929 | printk(KERN_INFO "BTRFS: device label %s ", disk_super->label); | |
930 | } else { | |
931 | printk(KERN_INFO "BTRFS: device fsid %pU ", disk_super->fsid); | |
932 | } | |
933 | ||
934 | printk(KERN_CONT "devid %llu transid %llu %s\n", devid, transid, path); | |
935 | ret = 0; | |
936 | } | |
02db0844 JB |
937 | if (!ret && fs_devices_ret) |
938 | (*fs_devices_ret)->total_devices = total_devices; | |
6f60cbd3 DS |
939 | |
940 | error_unmap: | |
941 | kunmap(page); | |
942 | page_cache_release(page); | |
943 | ||
944 | error_bdev_put: | |
d4d77629 | 945 | blkdev_put(bdev, flags); |
8a4b83cc | 946 | error: |
beaf8ab3 | 947 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
948 | return ret; |
949 | } | |
0b86a832 | 950 | |
6d07bcec MX |
951 | /* helper to account the used device space in the range */ |
952 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, | |
953 | u64 end, u64 *length) | |
954 | { | |
955 | struct btrfs_key key; | |
956 | struct btrfs_root *root = device->dev_root; | |
957 | struct btrfs_dev_extent *dev_extent; | |
958 | struct btrfs_path *path; | |
959 | u64 extent_end; | |
960 | int ret; | |
961 | int slot; | |
962 | struct extent_buffer *l; | |
963 | ||
964 | *length = 0; | |
965 | ||
63a212ab | 966 | if (start >= device->total_bytes || device->is_tgtdev_for_dev_replace) |
6d07bcec MX |
967 | return 0; |
968 | ||
969 | path = btrfs_alloc_path(); | |
970 | if (!path) | |
971 | return -ENOMEM; | |
972 | path->reada = 2; | |
973 | ||
974 | key.objectid = device->devid; | |
975 | key.offset = start; | |
976 | key.type = BTRFS_DEV_EXTENT_KEY; | |
977 | ||
978 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
979 | if (ret < 0) | |
980 | goto out; | |
981 | if (ret > 0) { | |
982 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
983 | if (ret < 0) | |
984 | goto out; | |
985 | } | |
986 | ||
987 | while (1) { | |
988 | l = path->nodes[0]; | |
989 | slot = path->slots[0]; | |
990 | if (slot >= btrfs_header_nritems(l)) { | |
991 | ret = btrfs_next_leaf(root, path); | |
992 | if (ret == 0) | |
993 | continue; | |
994 | if (ret < 0) | |
995 | goto out; | |
996 | ||
997 | break; | |
998 | } | |
999 | btrfs_item_key_to_cpu(l, &key, slot); | |
1000 | ||
1001 | if (key.objectid < device->devid) | |
1002 | goto next; | |
1003 | ||
1004 | if (key.objectid > device->devid) | |
1005 | break; | |
1006 | ||
1007 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) | |
1008 | goto next; | |
1009 | ||
1010 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
1011 | extent_end = key.offset + btrfs_dev_extent_length(l, | |
1012 | dev_extent); | |
1013 | if (key.offset <= start && extent_end > end) { | |
1014 | *length = end - start + 1; | |
1015 | break; | |
1016 | } else if (key.offset <= start && extent_end > start) | |
1017 | *length += extent_end - start; | |
1018 | else if (key.offset > start && extent_end <= end) | |
1019 | *length += extent_end - key.offset; | |
1020 | else if (key.offset > start && key.offset <= end) { | |
1021 | *length += end - key.offset + 1; | |
1022 | break; | |
1023 | } else if (key.offset > end) | |
1024 | break; | |
1025 | ||
1026 | next: | |
1027 | path->slots[0]++; | |
1028 | } | |
1029 | ret = 0; | |
1030 | out: | |
1031 | btrfs_free_path(path); | |
1032 | return ret; | |
1033 | } | |
1034 | ||
6df9a95e JB |
1035 | static int contains_pending_extent(struct btrfs_trans_handle *trans, |
1036 | struct btrfs_device *device, | |
1037 | u64 *start, u64 len) | |
1038 | { | |
1039 | struct extent_map *em; | |
1040 | int ret = 0; | |
1041 | ||
1042 | list_for_each_entry(em, &trans->transaction->pending_chunks, list) { | |
1043 | struct map_lookup *map; | |
1044 | int i; | |
1045 | ||
1046 | map = (struct map_lookup *)em->bdev; | |
1047 | for (i = 0; i < map->num_stripes; i++) { | |
1048 | if (map->stripes[i].dev != device) | |
1049 | continue; | |
1050 | if (map->stripes[i].physical >= *start + len || | |
1051 | map->stripes[i].physical + em->orig_block_len <= | |
1052 | *start) | |
1053 | continue; | |
1054 | *start = map->stripes[i].physical + | |
1055 | em->orig_block_len; | |
1056 | ret = 1; | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | return ret; | |
1061 | } | |
1062 | ||
1063 | ||
0b86a832 | 1064 | /* |
7bfc837d | 1065 | * find_free_dev_extent - find free space in the specified device |
7bfc837d MX |
1066 | * @device: the device which we search the free space in |
1067 | * @num_bytes: the size of the free space that we need | |
1068 | * @start: store the start of the free space. | |
1069 | * @len: the size of the free space. that we find, or the size of the max | |
1070 | * free space if we don't find suitable free space | |
1071 | * | |
0b86a832 CM |
1072 | * this uses a pretty simple search, the expectation is that it is |
1073 | * called very infrequently and that a given device has a small number | |
1074 | * of extents | |
7bfc837d MX |
1075 | * |
1076 | * @start is used to store the start of the free space if we find. But if we | |
1077 | * don't find suitable free space, it will be used to store the start position | |
1078 | * of the max free space. | |
1079 | * | |
1080 | * @len is used to store the size of the free space that we find. | |
1081 | * But if we don't find suitable free space, it is used to store the size of | |
1082 | * the max free space. | |
0b86a832 | 1083 | */ |
6df9a95e JB |
1084 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
1085 | struct btrfs_device *device, u64 num_bytes, | |
7bfc837d | 1086 | u64 *start, u64 *len) |
0b86a832 CM |
1087 | { |
1088 | struct btrfs_key key; | |
1089 | struct btrfs_root *root = device->dev_root; | |
7bfc837d | 1090 | struct btrfs_dev_extent *dev_extent; |
2b82032c | 1091 | struct btrfs_path *path; |
7bfc837d MX |
1092 | u64 hole_size; |
1093 | u64 max_hole_start; | |
1094 | u64 max_hole_size; | |
1095 | u64 extent_end; | |
1096 | u64 search_start; | |
0b86a832 CM |
1097 | u64 search_end = device->total_bytes; |
1098 | int ret; | |
7bfc837d | 1099 | int slot; |
0b86a832 CM |
1100 | struct extent_buffer *l; |
1101 | ||
0b86a832 CM |
1102 | /* FIXME use last free of some kind */ |
1103 | ||
8a4b83cc CM |
1104 | /* we don't want to overwrite the superblock on the drive, |
1105 | * so we make sure to start at an offset of at least 1MB | |
1106 | */ | |
a9c9bf68 | 1107 | search_start = max(root->fs_info->alloc_start, 1024ull * 1024); |
8f18cf13 | 1108 | |
6df9a95e JB |
1109 | path = btrfs_alloc_path(); |
1110 | if (!path) | |
1111 | return -ENOMEM; | |
1112 | again: | |
7bfc837d MX |
1113 | max_hole_start = search_start; |
1114 | max_hole_size = 0; | |
38c01b96 | 1115 | hole_size = 0; |
7bfc837d | 1116 | |
63a212ab | 1117 | if (search_start >= search_end || device->is_tgtdev_for_dev_replace) { |
7bfc837d | 1118 | ret = -ENOSPC; |
6df9a95e | 1119 | goto out; |
7bfc837d MX |
1120 | } |
1121 | ||
7bfc837d | 1122 | path->reada = 2; |
6df9a95e JB |
1123 | path->search_commit_root = 1; |
1124 | path->skip_locking = 1; | |
7bfc837d | 1125 | |
0b86a832 CM |
1126 | key.objectid = device->devid; |
1127 | key.offset = search_start; | |
1128 | key.type = BTRFS_DEV_EXTENT_KEY; | |
7bfc837d | 1129 | |
125ccb0a | 1130 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
0b86a832 | 1131 | if (ret < 0) |
7bfc837d | 1132 | goto out; |
1fcbac58 YZ |
1133 | if (ret > 0) { |
1134 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
1135 | if (ret < 0) | |
7bfc837d | 1136 | goto out; |
1fcbac58 | 1137 | } |
7bfc837d | 1138 | |
0b86a832 CM |
1139 | while (1) { |
1140 | l = path->nodes[0]; | |
1141 | slot = path->slots[0]; | |
1142 | if (slot >= btrfs_header_nritems(l)) { | |
1143 | ret = btrfs_next_leaf(root, path); | |
1144 | if (ret == 0) | |
1145 | continue; | |
1146 | if (ret < 0) | |
7bfc837d MX |
1147 | goto out; |
1148 | ||
1149 | break; | |
0b86a832 CM |
1150 | } |
1151 | btrfs_item_key_to_cpu(l, &key, slot); | |
1152 | ||
1153 | if (key.objectid < device->devid) | |
1154 | goto next; | |
1155 | ||
1156 | if (key.objectid > device->devid) | |
7bfc837d | 1157 | break; |
0b86a832 | 1158 | |
7bfc837d MX |
1159 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) |
1160 | goto next; | |
9779b72f | 1161 | |
7bfc837d MX |
1162 | if (key.offset > search_start) { |
1163 | hole_size = key.offset - search_start; | |
9779b72f | 1164 | |
6df9a95e JB |
1165 | /* |
1166 | * Have to check before we set max_hole_start, otherwise | |
1167 | * we could end up sending back this offset anyway. | |
1168 | */ | |
1169 | if (contains_pending_extent(trans, device, | |
1170 | &search_start, | |
1171 | hole_size)) | |
1172 | hole_size = 0; | |
1173 | ||
7bfc837d MX |
1174 | if (hole_size > max_hole_size) { |
1175 | max_hole_start = search_start; | |
1176 | max_hole_size = hole_size; | |
1177 | } | |
9779b72f | 1178 | |
7bfc837d MX |
1179 | /* |
1180 | * If this free space is greater than which we need, | |
1181 | * it must be the max free space that we have found | |
1182 | * until now, so max_hole_start must point to the start | |
1183 | * of this free space and the length of this free space | |
1184 | * is stored in max_hole_size. Thus, we return | |
1185 | * max_hole_start and max_hole_size and go back to the | |
1186 | * caller. | |
1187 | */ | |
1188 | if (hole_size >= num_bytes) { | |
1189 | ret = 0; | |
1190 | goto out; | |
0b86a832 CM |
1191 | } |
1192 | } | |
0b86a832 | 1193 | |
0b86a832 | 1194 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
7bfc837d MX |
1195 | extent_end = key.offset + btrfs_dev_extent_length(l, |
1196 | dev_extent); | |
1197 | if (extent_end > search_start) | |
1198 | search_start = extent_end; | |
0b86a832 CM |
1199 | next: |
1200 | path->slots[0]++; | |
1201 | cond_resched(); | |
1202 | } | |
0b86a832 | 1203 | |
38c01b96 | 1204 | /* |
1205 | * At this point, search_start should be the end of | |
1206 | * allocated dev extents, and when shrinking the device, | |
1207 | * search_end may be smaller than search_start. | |
1208 | */ | |
1209 | if (search_end > search_start) | |
1210 | hole_size = search_end - search_start; | |
1211 | ||
7bfc837d MX |
1212 | if (hole_size > max_hole_size) { |
1213 | max_hole_start = search_start; | |
1214 | max_hole_size = hole_size; | |
0b86a832 | 1215 | } |
0b86a832 | 1216 | |
6df9a95e JB |
1217 | if (contains_pending_extent(trans, device, &search_start, hole_size)) { |
1218 | btrfs_release_path(path); | |
1219 | goto again; | |
1220 | } | |
1221 | ||
7bfc837d MX |
1222 | /* See above. */ |
1223 | if (hole_size < num_bytes) | |
1224 | ret = -ENOSPC; | |
1225 | else | |
1226 | ret = 0; | |
1227 | ||
1228 | out: | |
2b82032c | 1229 | btrfs_free_path(path); |
7bfc837d | 1230 | *start = max_hole_start; |
b2117a39 | 1231 | if (len) |
7bfc837d | 1232 | *len = max_hole_size; |
0b86a832 CM |
1233 | return ret; |
1234 | } | |
1235 | ||
b2950863 | 1236 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
1237 | struct btrfs_device *device, |
1238 | u64 start) | |
1239 | { | |
1240 | int ret; | |
1241 | struct btrfs_path *path; | |
1242 | struct btrfs_root *root = device->dev_root; | |
1243 | struct btrfs_key key; | |
a061fc8d CM |
1244 | struct btrfs_key found_key; |
1245 | struct extent_buffer *leaf = NULL; | |
1246 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
1247 | |
1248 | path = btrfs_alloc_path(); | |
1249 | if (!path) | |
1250 | return -ENOMEM; | |
1251 | ||
1252 | key.objectid = device->devid; | |
1253 | key.offset = start; | |
1254 | key.type = BTRFS_DEV_EXTENT_KEY; | |
924cd8fb | 1255 | again: |
8f18cf13 | 1256 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
a061fc8d CM |
1257 | if (ret > 0) { |
1258 | ret = btrfs_previous_item(root, path, key.objectid, | |
1259 | BTRFS_DEV_EXTENT_KEY); | |
b0b802d7 TI |
1260 | if (ret) |
1261 | goto out; | |
a061fc8d CM |
1262 | leaf = path->nodes[0]; |
1263 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1264 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1265 | struct btrfs_dev_extent); | |
1266 | BUG_ON(found_key.offset > start || found_key.offset + | |
1267 | btrfs_dev_extent_length(leaf, extent) < start); | |
924cd8fb MX |
1268 | key = found_key; |
1269 | btrfs_release_path(path); | |
1270 | goto again; | |
a061fc8d CM |
1271 | } else if (ret == 0) { |
1272 | leaf = path->nodes[0]; | |
1273 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1274 | struct btrfs_dev_extent); | |
79787eaa JM |
1275 | } else { |
1276 | btrfs_error(root->fs_info, ret, "Slot search failed"); | |
1277 | goto out; | |
a061fc8d | 1278 | } |
8f18cf13 | 1279 | |
2bf64758 JB |
1280 | if (device->bytes_used > 0) { |
1281 | u64 len = btrfs_dev_extent_length(leaf, extent); | |
1282 | device->bytes_used -= len; | |
1283 | spin_lock(&root->fs_info->free_chunk_lock); | |
1284 | root->fs_info->free_chunk_space += len; | |
1285 | spin_unlock(&root->fs_info->free_chunk_lock); | |
1286 | } | |
8f18cf13 | 1287 | ret = btrfs_del_item(trans, root, path); |
79787eaa JM |
1288 | if (ret) { |
1289 | btrfs_error(root->fs_info, ret, | |
1290 | "Failed to remove dev extent item"); | |
1291 | } | |
b0b802d7 | 1292 | out: |
8f18cf13 CM |
1293 | btrfs_free_path(path); |
1294 | return ret; | |
1295 | } | |
1296 | ||
48a3b636 ES |
1297 | static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
1298 | struct btrfs_device *device, | |
1299 | u64 chunk_tree, u64 chunk_objectid, | |
1300 | u64 chunk_offset, u64 start, u64 num_bytes) | |
0b86a832 CM |
1301 | { |
1302 | int ret; | |
1303 | struct btrfs_path *path; | |
1304 | struct btrfs_root *root = device->dev_root; | |
1305 | struct btrfs_dev_extent *extent; | |
1306 | struct extent_buffer *leaf; | |
1307 | struct btrfs_key key; | |
1308 | ||
dfe25020 | 1309 | WARN_ON(!device->in_fs_metadata); |
63a212ab | 1310 | WARN_ON(device->is_tgtdev_for_dev_replace); |
0b86a832 CM |
1311 | path = btrfs_alloc_path(); |
1312 | if (!path) | |
1313 | return -ENOMEM; | |
1314 | ||
0b86a832 | 1315 | key.objectid = device->devid; |
2b82032c | 1316 | key.offset = start; |
0b86a832 CM |
1317 | key.type = BTRFS_DEV_EXTENT_KEY; |
1318 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1319 | sizeof(*extent)); | |
2cdcecbc MF |
1320 | if (ret) |
1321 | goto out; | |
0b86a832 CM |
1322 | |
1323 | leaf = path->nodes[0]; | |
1324 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1325 | struct btrfs_dev_extent); | |
e17cade2 CM |
1326 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
1327 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
1328 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
1329 | ||
1330 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
231e88f4 | 1331 | btrfs_dev_extent_chunk_tree_uuid(extent), BTRFS_UUID_SIZE); |
e17cade2 | 1332 | |
0b86a832 CM |
1333 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
1334 | btrfs_mark_buffer_dirty(leaf); | |
2cdcecbc | 1335 | out: |
0b86a832 CM |
1336 | btrfs_free_path(path); |
1337 | return ret; | |
1338 | } | |
1339 | ||
6df9a95e | 1340 | static u64 find_next_chunk(struct btrfs_fs_info *fs_info) |
0b86a832 | 1341 | { |
6df9a95e JB |
1342 | struct extent_map_tree *em_tree; |
1343 | struct extent_map *em; | |
1344 | struct rb_node *n; | |
1345 | u64 ret = 0; | |
0b86a832 | 1346 | |
6df9a95e JB |
1347 | em_tree = &fs_info->mapping_tree.map_tree; |
1348 | read_lock(&em_tree->lock); | |
1349 | n = rb_last(&em_tree->map); | |
1350 | if (n) { | |
1351 | em = rb_entry(n, struct extent_map, rb_node); | |
1352 | ret = em->start + em->len; | |
0b86a832 | 1353 | } |
6df9a95e JB |
1354 | read_unlock(&em_tree->lock); |
1355 | ||
0b86a832 CM |
1356 | return ret; |
1357 | } | |
1358 | ||
53f10659 ID |
1359 | static noinline int find_next_devid(struct btrfs_fs_info *fs_info, |
1360 | u64 *devid_ret) | |
0b86a832 CM |
1361 | { |
1362 | int ret; | |
1363 | struct btrfs_key key; | |
1364 | struct btrfs_key found_key; | |
2b82032c YZ |
1365 | struct btrfs_path *path; |
1366 | ||
2b82032c YZ |
1367 | path = btrfs_alloc_path(); |
1368 | if (!path) | |
1369 | return -ENOMEM; | |
0b86a832 CM |
1370 | |
1371 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1372 | key.type = BTRFS_DEV_ITEM_KEY; | |
1373 | key.offset = (u64)-1; | |
1374 | ||
53f10659 | 1375 | ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, path, 0, 0); |
0b86a832 CM |
1376 | if (ret < 0) |
1377 | goto error; | |
1378 | ||
79787eaa | 1379 | BUG_ON(ret == 0); /* Corruption */ |
0b86a832 | 1380 | |
53f10659 ID |
1381 | ret = btrfs_previous_item(fs_info->chunk_root, path, |
1382 | BTRFS_DEV_ITEMS_OBJECTID, | |
0b86a832 CM |
1383 | BTRFS_DEV_ITEM_KEY); |
1384 | if (ret) { | |
53f10659 | 1385 | *devid_ret = 1; |
0b86a832 CM |
1386 | } else { |
1387 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1388 | path->slots[0]); | |
53f10659 | 1389 | *devid_ret = found_key.offset + 1; |
0b86a832 CM |
1390 | } |
1391 | ret = 0; | |
1392 | error: | |
2b82032c | 1393 | btrfs_free_path(path); |
0b86a832 CM |
1394 | return ret; |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * the device information is stored in the chunk root | |
1399 | * the btrfs_device struct should be fully filled in | |
1400 | */ | |
48a3b636 ES |
1401 | static int btrfs_add_device(struct btrfs_trans_handle *trans, |
1402 | struct btrfs_root *root, | |
1403 | struct btrfs_device *device) | |
0b86a832 CM |
1404 | { |
1405 | int ret; | |
1406 | struct btrfs_path *path; | |
1407 | struct btrfs_dev_item *dev_item; | |
1408 | struct extent_buffer *leaf; | |
1409 | struct btrfs_key key; | |
1410 | unsigned long ptr; | |
0b86a832 CM |
1411 | |
1412 | root = root->fs_info->chunk_root; | |
1413 | ||
1414 | path = btrfs_alloc_path(); | |
1415 | if (!path) | |
1416 | return -ENOMEM; | |
1417 | ||
0b86a832 CM |
1418 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1419 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 1420 | key.offset = device->devid; |
0b86a832 CM |
1421 | |
1422 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 1423 | sizeof(*dev_item)); |
0b86a832 CM |
1424 | if (ret) |
1425 | goto out; | |
1426 | ||
1427 | leaf = path->nodes[0]; | |
1428 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1429 | ||
1430 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 1431 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
1432 | btrfs_set_device_type(leaf, dev_item, device->type); |
1433 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1434 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1435 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
1436 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
1437 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
e17cade2 CM |
1438 | btrfs_set_device_group(leaf, dev_item, 0); |
1439 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
1440 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 1441 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 1442 | |
410ba3a2 | 1443 | ptr = btrfs_device_uuid(dev_item); |
e17cade2 | 1444 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
1473b24e | 1445 | ptr = btrfs_device_fsid(dev_item); |
2b82032c | 1446 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 1447 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 1448 | |
2b82032c | 1449 | ret = 0; |
0b86a832 CM |
1450 | out: |
1451 | btrfs_free_path(path); | |
1452 | return ret; | |
1453 | } | |
8f18cf13 | 1454 | |
a061fc8d CM |
1455 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
1456 | struct btrfs_device *device) | |
1457 | { | |
1458 | int ret; | |
1459 | struct btrfs_path *path; | |
a061fc8d | 1460 | struct btrfs_key key; |
a061fc8d CM |
1461 | struct btrfs_trans_handle *trans; |
1462 | ||
1463 | root = root->fs_info->chunk_root; | |
1464 | ||
1465 | path = btrfs_alloc_path(); | |
1466 | if (!path) | |
1467 | return -ENOMEM; | |
1468 | ||
a22285a6 | 1469 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1470 | if (IS_ERR(trans)) { |
1471 | btrfs_free_path(path); | |
1472 | return PTR_ERR(trans); | |
1473 | } | |
a061fc8d CM |
1474 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1475 | key.type = BTRFS_DEV_ITEM_KEY; | |
1476 | key.offset = device->devid; | |
7d9eb12c | 1477 | lock_chunks(root); |
a061fc8d CM |
1478 | |
1479 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1480 | if (ret < 0) | |
1481 | goto out; | |
1482 | ||
1483 | if (ret > 0) { | |
1484 | ret = -ENOENT; | |
1485 | goto out; | |
1486 | } | |
1487 | ||
1488 | ret = btrfs_del_item(trans, root, path); | |
1489 | if (ret) | |
1490 | goto out; | |
a061fc8d CM |
1491 | out: |
1492 | btrfs_free_path(path); | |
7d9eb12c | 1493 | unlock_chunks(root); |
a061fc8d CM |
1494 | btrfs_commit_transaction(trans, root); |
1495 | return ret; | |
1496 | } | |
1497 | ||
1498 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
1499 | { | |
1500 | struct btrfs_device *device; | |
2b82032c | 1501 | struct btrfs_device *next_device; |
a061fc8d | 1502 | struct block_device *bdev; |
dfe25020 | 1503 | struct buffer_head *bh = NULL; |
a061fc8d | 1504 | struct btrfs_super_block *disk_super; |
1f78160c | 1505 | struct btrfs_fs_devices *cur_devices; |
a061fc8d CM |
1506 | u64 all_avail; |
1507 | u64 devid; | |
2b82032c YZ |
1508 | u64 num_devices; |
1509 | u8 *dev_uuid; | |
de98ced9 | 1510 | unsigned seq; |
a061fc8d | 1511 | int ret = 0; |
1f78160c | 1512 | bool clear_super = false; |
a061fc8d | 1513 | |
a061fc8d CM |
1514 | mutex_lock(&uuid_mutex); |
1515 | ||
de98ced9 MX |
1516 | do { |
1517 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
1518 | ||
1519 | all_avail = root->fs_info->avail_data_alloc_bits | | |
1520 | root->fs_info->avail_system_alloc_bits | | |
1521 | root->fs_info->avail_metadata_alloc_bits; | |
1522 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
a061fc8d | 1523 | |
8dabb742 SB |
1524 | num_devices = root->fs_info->fs_devices->num_devices; |
1525 | btrfs_dev_replace_lock(&root->fs_info->dev_replace); | |
1526 | if (btrfs_dev_replace_is_ongoing(&root->fs_info->dev_replace)) { | |
1527 | WARN_ON(num_devices < 1); | |
1528 | num_devices--; | |
1529 | } | |
1530 | btrfs_dev_replace_unlock(&root->fs_info->dev_replace); | |
1531 | ||
1532 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && num_devices <= 4) { | |
183860f6 | 1533 | ret = BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET; |
a061fc8d CM |
1534 | goto out; |
1535 | } | |
1536 | ||
8dabb742 | 1537 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && num_devices <= 2) { |
183860f6 | 1538 | ret = BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET; |
a061fc8d CM |
1539 | goto out; |
1540 | } | |
1541 | ||
53b381b3 DW |
1542 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID5) && |
1543 | root->fs_info->fs_devices->rw_devices <= 2) { | |
183860f6 | 1544 | ret = BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET; |
53b381b3 DW |
1545 | goto out; |
1546 | } | |
1547 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID6) && | |
1548 | root->fs_info->fs_devices->rw_devices <= 3) { | |
183860f6 | 1549 | ret = BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET; |
53b381b3 DW |
1550 | goto out; |
1551 | } | |
1552 | ||
dfe25020 | 1553 | if (strcmp(device_path, "missing") == 0) { |
dfe25020 CM |
1554 | struct list_head *devices; |
1555 | struct btrfs_device *tmp; | |
a061fc8d | 1556 | |
dfe25020 CM |
1557 | device = NULL; |
1558 | devices = &root->fs_info->fs_devices->devices; | |
46224705 XG |
1559 | /* |
1560 | * It is safe to read the devices since the volume_mutex | |
1561 | * is held. | |
1562 | */ | |
c6e30871 | 1563 | list_for_each_entry(tmp, devices, dev_list) { |
63a212ab SB |
1564 | if (tmp->in_fs_metadata && |
1565 | !tmp->is_tgtdev_for_dev_replace && | |
1566 | !tmp->bdev) { | |
dfe25020 CM |
1567 | device = tmp; |
1568 | break; | |
1569 | } | |
1570 | } | |
1571 | bdev = NULL; | |
1572 | bh = NULL; | |
1573 | disk_super = NULL; | |
1574 | if (!device) { | |
183860f6 | 1575 | ret = BTRFS_ERROR_DEV_MISSING_NOT_FOUND; |
dfe25020 CM |
1576 | goto out; |
1577 | } | |
dfe25020 | 1578 | } else { |
beaf8ab3 | 1579 | ret = btrfs_get_bdev_and_sb(device_path, |
cc975eb4 | 1580 | FMODE_WRITE | FMODE_EXCL, |
beaf8ab3 SB |
1581 | root->fs_info->bdev_holder, 0, |
1582 | &bdev, &bh); | |
1583 | if (ret) | |
dfe25020 | 1584 | goto out; |
dfe25020 | 1585 | disk_super = (struct btrfs_super_block *)bh->b_data; |
a343832f | 1586 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
2b82032c | 1587 | dev_uuid = disk_super->dev_item.uuid; |
aa1b8cd4 | 1588 | device = btrfs_find_device(root->fs_info, devid, dev_uuid, |
2b82032c | 1589 | disk_super->fsid); |
dfe25020 CM |
1590 | if (!device) { |
1591 | ret = -ENOENT; | |
1592 | goto error_brelse; | |
1593 | } | |
2b82032c | 1594 | } |
dfe25020 | 1595 | |
63a212ab | 1596 | if (device->is_tgtdev_for_dev_replace) { |
183860f6 | 1597 | ret = BTRFS_ERROR_DEV_TGT_REPLACE; |
63a212ab SB |
1598 | goto error_brelse; |
1599 | } | |
1600 | ||
2b82032c | 1601 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
183860f6 | 1602 | ret = BTRFS_ERROR_DEV_ONLY_WRITABLE; |
2b82032c YZ |
1603 | goto error_brelse; |
1604 | } | |
1605 | ||
1606 | if (device->writeable) { | |
0c1daee0 | 1607 | lock_chunks(root); |
2b82032c | 1608 | list_del_init(&device->dev_alloc_list); |
0c1daee0 | 1609 | unlock_chunks(root); |
2b82032c | 1610 | root->fs_info->fs_devices->rw_devices--; |
1f78160c | 1611 | clear_super = true; |
dfe25020 | 1612 | } |
a061fc8d | 1613 | |
d7901554 | 1614 | mutex_unlock(&uuid_mutex); |
a061fc8d | 1615 | ret = btrfs_shrink_device(device, 0); |
d7901554 | 1616 | mutex_lock(&uuid_mutex); |
a061fc8d | 1617 | if (ret) |
9b3517e9 | 1618 | goto error_undo; |
a061fc8d | 1619 | |
63a212ab SB |
1620 | /* |
1621 | * TODO: the superblock still includes this device in its num_devices | |
1622 | * counter although write_all_supers() is not locked out. This | |
1623 | * could give a filesystem state which requires a degraded mount. | |
1624 | */ | |
a061fc8d CM |
1625 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
1626 | if (ret) | |
9b3517e9 | 1627 | goto error_undo; |
a061fc8d | 1628 | |
2bf64758 JB |
1629 | spin_lock(&root->fs_info->free_chunk_lock); |
1630 | root->fs_info->free_chunk_space = device->total_bytes - | |
1631 | device->bytes_used; | |
1632 | spin_unlock(&root->fs_info->free_chunk_lock); | |
1633 | ||
2b82032c | 1634 | device->in_fs_metadata = 0; |
aa1b8cd4 | 1635 | btrfs_scrub_cancel_dev(root->fs_info, device); |
e5e9a520 CM |
1636 | |
1637 | /* | |
1638 | * the device list mutex makes sure that we don't change | |
1639 | * the device list while someone else is writing out all | |
d7306801 FDBM |
1640 | * the device supers. Whoever is writing all supers, should |
1641 | * lock the device list mutex before getting the number of | |
1642 | * devices in the super block (super_copy). Conversely, | |
1643 | * whoever updates the number of devices in the super block | |
1644 | * (super_copy) should hold the device list mutex. | |
e5e9a520 | 1645 | */ |
1f78160c XG |
1646 | |
1647 | cur_devices = device->fs_devices; | |
e5e9a520 | 1648 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
1f78160c | 1649 | list_del_rcu(&device->dev_list); |
e5e9a520 | 1650 | |
e4404d6e | 1651 | device->fs_devices->num_devices--; |
02db0844 | 1652 | device->fs_devices->total_devices--; |
2b82032c | 1653 | |
cd02dca5 CM |
1654 | if (device->missing) |
1655 | root->fs_info->fs_devices->missing_devices--; | |
1656 | ||
2b82032c YZ |
1657 | next_device = list_entry(root->fs_info->fs_devices->devices.next, |
1658 | struct btrfs_device, dev_list); | |
1659 | if (device->bdev == root->fs_info->sb->s_bdev) | |
1660 | root->fs_info->sb->s_bdev = next_device->bdev; | |
1661 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) | |
1662 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1663 | ||
1f78160c | 1664 | if (device->bdev) |
e4404d6e | 1665 | device->fs_devices->open_devices--; |
1f78160c XG |
1666 | |
1667 | call_rcu(&device->rcu, free_device); | |
e4404d6e | 1668 | |
6c41761f DS |
1669 | num_devices = btrfs_super_num_devices(root->fs_info->super_copy) - 1; |
1670 | btrfs_set_super_num_devices(root->fs_info->super_copy, num_devices); | |
d7306801 | 1671 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
2b82032c | 1672 | |
1f78160c | 1673 | if (cur_devices->open_devices == 0) { |
e4404d6e YZ |
1674 | struct btrfs_fs_devices *fs_devices; |
1675 | fs_devices = root->fs_info->fs_devices; | |
1676 | while (fs_devices) { | |
1f78160c | 1677 | if (fs_devices->seed == cur_devices) |
e4404d6e YZ |
1678 | break; |
1679 | fs_devices = fs_devices->seed; | |
2b82032c | 1680 | } |
1f78160c XG |
1681 | fs_devices->seed = cur_devices->seed; |
1682 | cur_devices->seed = NULL; | |
0c1daee0 | 1683 | lock_chunks(root); |
1f78160c | 1684 | __btrfs_close_devices(cur_devices); |
0c1daee0 | 1685 | unlock_chunks(root); |
1f78160c | 1686 | free_fs_devices(cur_devices); |
2b82032c YZ |
1687 | } |
1688 | ||
5af3e8cc SB |
1689 | root->fs_info->num_tolerated_disk_barrier_failures = |
1690 | btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info); | |
1691 | ||
2b82032c YZ |
1692 | /* |
1693 | * at this point, the device is zero sized. We want to | |
1694 | * remove it from the devices list and zero out the old super | |
1695 | */ | |
aa1b8cd4 | 1696 | if (clear_super && disk_super) { |
dfe25020 CM |
1697 | /* make sure this device isn't detected as part of |
1698 | * the FS anymore | |
1699 | */ | |
1700 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
1701 | set_buffer_dirty(bh); | |
1702 | sync_dirty_buffer(bh); | |
dfe25020 | 1703 | } |
a061fc8d | 1704 | |
a061fc8d | 1705 | ret = 0; |
a061fc8d | 1706 | |
b8b8ff59 | 1707 | /* Notify udev that device has changed */ |
3c911608 ES |
1708 | if (bdev) |
1709 | btrfs_kobject_uevent(bdev, KOBJ_CHANGE); | |
b8b8ff59 | 1710 | |
a061fc8d CM |
1711 | error_brelse: |
1712 | brelse(bh); | |
dfe25020 | 1713 | if (bdev) |
e525fd89 | 1714 | blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
a061fc8d CM |
1715 | out: |
1716 | mutex_unlock(&uuid_mutex); | |
a061fc8d | 1717 | return ret; |
9b3517e9 ID |
1718 | error_undo: |
1719 | if (device->writeable) { | |
0c1daee0 | 1720 | lock_chunks(root); |
9b3517e9 ID |
1721 | list_add(&device->dev_alloc_list, |
1722 | &root->fs_info->fs_devices->alloc_list); | |
0c1daee0 | 1723 | unlock_chunks(root); |
9b3517e9 ID |
1724 | root->fs_info->fs_devices->rw_devices++; |
1725 | } | |
1726 | goto error_brelse; | |
a061fc8d CM |
1727 | } |
1728 | ||
e93c89c1 SB |
1729 | void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info, |
1730 | struct btrfs_device *srcdev) | |
1731 | { | |
1732 | WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex)); | |
1357272f | 1733 | |
e93c89c1 SB |
1734 | list_del_rcu(&srcdev->dev_list); |
1735 | list_del_rcu(&srcdev->dev_alloc_list); | |
1736 | fs_info->fs_devices->num_devices--; | |
1737 | if (srcdev->missing) { | |
1738 | fs_info->fs_devices->missing_devices--; | |
1739 | fs_info->fs_devices->rw_devices++; | |
1740 | } | |
1741 | if (srcdev->can_discard) | |
1742 | fs_info->fs_devices->num_can_discard--; | |
1357272f | 1743 | if (srcdev->bdev) { |
e93c89c1 SB |
1744 | fs_info->fs_devices->open_devices--; |
1745 | ||
1357272f ID |
1746 | /* zero out the old super */ |
1747 | btrfs_scratch_superblock(srcdev); | |
1748 | } | |
1749 | ||
e93c89c1 SB |
1750 | call_rcu(&srcdev->rcu, free_device); |
1751 | } | |
1752 | ||
1753 | void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
1754 | struct btrfs_device *tgtdev) | |
1755 | { | |
1756 | struct btrfs_device *next_device; | |
1757 | ||
1758 | WARN_ON(!tgtdev); | |
1759 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
1760 | if (tgtdev->bdev) { | |
1761 | btrfs_scratch_superblock(tgtdev); | |
1762 | fs_info->fs_devices->open_devices--; | |
1763 | } | |
1764 | fs_info->fs_devices->num_devices--; | |
1765 | if (tgtdev->can_discard) | |
1766 | fs_info->fs_devices->num_can_discard++; | |
1767 | ||
1768 | next_device = list_entry(fs_info->fs_devices->devices.next, | |
1769 | struct btrfs_device, dev_list); | |
1770 | if (tgtdev->bdev == fs_info->sb->s_bdev) | |
1771 | fs_info->sb->s_bdev = next_device->bdev; | |
1772 | if (tgtdev->bdev == fs_info->fs_devices->latest_bdev) | |
1773 | fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1774 | list_del_rcu(&tgtdev->dev_list); | |
1775 | ||
1776 | call_rcu(&tgtdev->rcu, free_device); | |
1777 | ||
1778 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
1779 | } | |
1780 | ||
48a3b636 ES |
1781 | static int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path, |
1782 | struct btrfs_device **device) | |
7ba15b7d SB |
1783 | { |
1784 | int ret = 0; | |
1785 | struct btrfs_super_block *disk_super; | |
1786 | u64 devid; | |
1787 | u8 *dev_uuid; | |
1788 | struct block_device *bdev; | |
1789 | struct buffer_head *bh; | |
1790 | ||
1791 | *device = NULL; | |
1792 | ret = btrfs_get_bdev_and_sb(device_path, FMODE_READ, | |
1793 | root->fs_info->bdev_holder, 0, &bdev, &bh); | |
1794 | if (ret) | |
1795 | return ret; | |
1796 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
1797 | devid = btrfs_stack_device_id(&disk_super->dev_item); | |
1798 | dev_uuid = disk_super->dev_item.uuid; | |
aa1b8cd4 | 1799 | *device = btrfs_find_device(root->fs_info, devid, dev_uuid, |
7ba15b7d SB |
1800 | disk_super->fsid); |
1801 | brelse(bh); | |
1802 | if (!*device) | |
1803 | ret = -ENOENT; | |
1804 | blkdev_put(bdev, FMODE_READ); | |
1805 | return ret; | |
1806 | } | |
1807 | ||
1808 | int btrfs_find_device_missing_or_by_path(struct btrfs_root *root, | |
1809 | char *device_path, | |
1810 | struct btrfs_device **device) | |
1811 | { | |
1812 | *device = NULL; | |
1813 | if (strcmp(device_path, "missing") == 0) { | |
1814 | struct list_head *devices; | |
1815 | struct btrfs_device *tmp; | |
1816 | ||
1817 | devices = &root->fs_info->fs_devices->devices; | |
1818 | /* | |
1819 | * It is safe to read the devices since the volume_mutex | |
1820 | * is held by the caller. | |
1821 | */ | |
1822 | list_for_each_entry(tmp, devices, dev_list) { | |
1823 | if (tmp->in_fs_metadata && !tmp->bdev) { | |
1824 | *device = tmp; | |
1825 | break; | |
1826 | } | |
1827 | } | |
1828 | ||
1829 | if (!*device) { | |
efe120a0 | 1830 | btrfs_err(root->fs_info, "no missing device found"); |
7ba15b7d SB |
1831 | return -ENOENT; |
1832 | } | |
1833 | ||
1834 | return 0; | |
1835 | } else { | |
1836 | return btrfs_find_device_by_path(root, device_path, device); | |
1837 | } | |
1838 | } | |
1839 | ||
2b82032c YZ |
1840 | /* |
1841 | * does all the dirty work required for changing file system's UUID. | |
1842 | */ | |
125ccb0a | 1843 | static int btrfs_prepare_sprout(struct btrfs_root *root) |
2b82032c YZ |
1844 | { |
1845 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
1846 | struct btrfs_fs_devices *old_devices; | |
e4404d6e | 1847 | struct btrfs_fs_devices *seed_devices; |
6c41761f | 1848 | struct btrfs_super_block *disk_super = root->fs_info->super_copy; |
2b82032c YZ |
1849 | struct btrfs_device *device; |
1850 | u64 super_flags; | |
1851 | ||
1852 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 1853 | if (!fs_devices->seeding) |
2b82032c YZ |
1854 | return -EINVAL; |
1855 | ||
2208a378 ID |
1856 | seed_devices = __alloc_fs_devices(); |
1857 | if (IS_ERR(seed_devices)) | |
1858 | return PTR_ERR(seed_devices); | |
2b82032c | 1859 | |
e4404d6e YZ |
1860 | old_devices = clone_fs_devices(fs_devices); |
1861 | if (IS_ERR(old_devices)) { | |
1862 | kfree(seed_devices); | |
1863 | return PTR_ERR(old_devices); | |
2b82032c | 1864 | } |
e4404d6e | 1865 | |
2b82032c YZ |
1866 | list_add(&old_devices->list, &fs_uuids); |
1867 | ||
e4404d6e YZ |
1868 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
1869 | seed_devices->opened = 1; | |
1870 | INIT_LIST_HEAD(&seed_devices->devices); | |
1871 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
e5e9a520 | 1872 | mutex_init(&seed_devices->device_list_mutex); |
c9513edb XG |
1873 | |
1874 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c XG |
1875 | list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices, |
1876 | synchronize_rcu); | |
c9513edb | 1877 | |
e4404d6e YZ |
1878 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); |
1879 | list_for_each_entry(device, &seed_devices->devices, dev_list) { | |
1880 | device->fs_devices = seed_devices; | |
1881 | } | |
1882 | ||
2b82032c YZ |
1883 | fs_devices->seeding = 0; |
1884 | fs_devices->num_devices = 0; | |
1885 | fs_devices->open_devices = 0; | |
02db0844 | 1886 | fs_devices->total_devices = 0; |
e4404d6e | 1887 | fs_devices->seed = seed_devices; |
2b82032c YZ |
1888 | |
1889 | generate_random_uuid(fs_devices->fsid); | |
1890 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1891 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
f7171750 FDBM |
1892 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
1893 | ||
2b82032c YZ |
1894 | super_flags = btrfs_super_flags(disk_super) & |
1895 | ~BTRFS_SUPER_FLAG_SEEDING; | |
1896 | btrfs_set_super_flags(disk_super, super_flags); | |
1897 | ||
1898 | return 0; | |
1899 | } | |
1900 | ||
1901 | /* | |
1902 | * strore the expected generation for seed devices in device items. | |
1903 | */ | |
1904 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
1905 | struct btrfs_root *root) | |
1906 | { | |
1907 | struct btrfs_path *path; | |
1908 | struct extent_buffer *leaf; | |
1909 | struct btrfs_dev_item *dev_item; | |
1910 | struct btrfs_device *device; | |
1911 | struct btrfs_key key; | |
1912 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
1913 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
1914 | u64 devid; | |
1915 | int ret; | |
1916 | ||
1917 | path = btrfs_alloc_path(); | |
1918 | if (!path) | |
1919 | return -ENOMEM; | |
1920 | ||
1921 | root = root->fs_info->chunk_root; | |
1922 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1923 | key.offset = 0; | |
1924 | key.type = BTRFS_DEV_ITEM_KEY; | |
1925 | ||
1926 | while (1) { | |
1927 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1928 | if (ret < 0) | |
1929 | goto error; | |
1930 | ||
1931 | leaf = path->nodes[0]; | |
1932 | next_slot: | |
1933 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1934 | ret = btrfs_next_leaf(root, path); | |
1935 | if (ret > 0) | |
1936 | break; | |
1937 | if (ret < 0) | |
1938 | goto error; | |
1939 | leaf = path->nodes[0]; | |
1940 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 1941 | btrfs_release_path(path); |
2b82032c YZ |
1942 | continue; |
1943 | } | |
1944 | ||
1945 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1946 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
1947 | key.type != BTRFS_DEV_ITEM_KEY) | |
1948 | break; | |
1949 | ||
1950 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
1951 | struct btrfs_dev_item); | |
1952 | devid = btrfs_device_id(leaf, dev_item); | |
410ba3a2 | 1953 | read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item), |
2b82032c | 1954 | BTRFS_UUID_SIZE); |
1473b24e | 1955 | read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item), |
2b82032c | 1956 | BTRFS_UUID_SIZE); |
aa1b8cd4 SB |
1957 | device = btrfs_find_device(root->fs_info, devid, dev_uuid, |
1958 | fs_uuid); | |
79787eaa | 1959 | BUG_ON(!device); /* Logic error */ |
2b82032c YZ |
1960 | |
1961 | if (device->fs_devices->seeding) { | |
1962 | btrfs_set_device_generation(leaf, dev_item, | |
1963 | device->generation); | |
1964 | btrfs_mark_buffer_dirty(leaf); | |
1965 | } | |
1966 | ||
1967 | path->slots[0]++; | |
1968 | goto next_slot; | |
1969 | } | |
1970 | ret = 0; | |
1971 | error: | |
1972 | btrfs_free_path(path); | |
1973 | return ret; | |
1974 | } | |
1975 | ||
788f20eb CM |
1976 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
1977 | { | |
d5e2003c | 1978 | struct request_queue *q; |
788f20eb CM |
1979 | struct btrfs_trans_handle *trans; |
1980 | struct btrfs_device *device; | |
1981 | struct block_device *bdev; | |
788f20eb | 1982 | struct list_head *devices; |
2b82032c | 1983 | struct super_block *sb = root->fs_info->sb; |
606686ee | 1984 | struct rcu_string *name; |
788f20eb | 1985 | u64 total_bytes; |
2b82032c | 1986 | int seeding_dev = 0; |
788f20eb CM |
1987 | int ret = 0; |
1988 | ||
2b82032c | 1989 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
f8c5d0b4 | 1990 | return -EROFS; |
788f20eb | 1991 | |
a5d16333 | 1992 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, |
d4d77629 | 1993 | root->fs_info->bdev_holder); |
7f59203a JB |
1994 | if (IS_ERR(bdev)) |
1995 | return PTR_ERR(bdev); | |
a2135011 | 1996 | |
2b82032c YZ |
1997 | if (root->fs_info->fs_devices->seeding) { |
1998 | seeding_dev = 1; | |
1999 | down_write(&sb->s_umount); | |
2000 | mutex_lock(&uuid_mutex); | |
2001 | } | |
2002 | ||
8c8bee1d | 2003 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
a2135011 | 2004 | |
788f20eb | 2005 | devices = &root->fs_info->fs_devices->devices; |
d25628bd LB |
2006 | |
2007 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
c6e30871 | 2008 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
2009 | if (device->bdev == bdev) { |
2010 | ret = -EEXIST; | |
d25628bd LB |
2011 | mutex_unlock( |
2012 | &root->fs_info->fs_devices->device_list_mutex); | |
2b82032c | 2013 | goto error; |
788f20eb CM |
2014 | } |
2015 | } | |
d25628bd | 2016 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 2017 | |
12bd2fc0 ID |
2018 | device = btrfs_alloc_device(root->fs_info, NULL, NULL); |
2019 | if (IS_ERR(device)) { | |
788f20eb | 2020 | /* we can safely leave the fs_devices entry around */ |
12bd2fc0 | 2021 | ret = PTR_ERR(device); |
2b82032c | 2022 | goto error; |
788f20eb CM |
2023 | } |
2024 | ||
606686ee JB |
2025 | name = rcu_string_strdup(device_path, GFP_NOFS); |
2026 | if (!name) { | |
788f20eb | 2027 | kfree(device); |
2b82032c YZ |
2028 | ret = -ENOMEM; |
2029 | goto error; | |
788f20eb | 2030 | } |
606686ee | 2031 | rcu_assign_pointer(device->name, name); |
2b82032c | 2032 | |
a22285a6 | 2033 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 2034 | if (IS_ERR(trans)) { |
606686ee | 2035 | rcu_string_free(device->name); |
98d5dc13 TI |
2036 | kfree(device); |
2037 | ret = PTR_ERR(trans); | |
2038 | goto error; | |
2039 | } | |
2040 | ||
2b82032c YZ |
2041 | lock_chunks(root); |
2042 | ||
d5e2003c JB |
2043 | q = bdev_get_queue(bdev); |
2044 | if (blk_queue_discard(q)) | |
2045 | device->can_discard = 1; | |
2b82032c | 2046 | device->writeable = 1; |
2b82032c | 2047 | device->generation = trans->transid; |
788f20eb CM |
2048 | device->io_width = root->sectorsize; |
2049 | device->io_align = root->sectorsize; | |
2050 | device->sector_size = root->sectorsize; | |
2051 | device->total_bytes = i_size_read(bdev->bd_inode); | |
2cc3c559 | 2052 | device->disk_total_bytes = device->total_bytes; |
788f20eb CM |
2053 | device->dev_root = root->fs_info->dev_root; |
2054 | device->bdev = bdev; | |
dfe25020 | 2055 | device->in_fs_metadata = 1; |
63a212ab | 2056 | device->is_tgtdev_for_dev_replace = 0; |
fb01aa85 | 2057 | device->mode = FMODE_EXCL; |
27087f37 | 2058 | device->dev_stats_valid = 1; |
2b82032c | 2059 | set_blocksize(device->bdev, 4096); |
788f20eb | 2060 | |
2b82032c YZ |
2061 | if (seeding_dev) { |
2062 | sb->s_flags &= ~MS_RDONLY; | |
125ccb0a | 2063 | ret = btrfs_prepare_sprout(root); |
79787eaa | 2064 | BUG_ON(ret); /* -ENOMEM */ |
2b82032c | 2065 | } |
788f20eb | 2066 | |
2b82032c | 2067 | device->fs_devices = root->fs_info->fs_devices; |
e5e9a520 | 2068 | |
e5e9a520 | 2069 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
1f78160c | 2070 | list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices); |
2b82032c YZ |
2071 | list_add(&device->dev_alloc_list, |
2072 | &root->fs_info->fs_devices->alloc_list); | |
2073 | root->fs_info->fs_devices->num_devices++; | |
2074 | root->fs_info->fs_devices->open_devices++; | |
2075 | root->fs_info->fs_devices->rw_devices++; | |
02db0844 | 2076 | root->fs_info->fs_devices->total_devices++; |
d5e2003c JB |
2077 | if (device->can_discard) |
2078 | root->fs_info->fs_devices->num_can_discard++; | |
2b82032c | 2079 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; |
325cd4ba | 2080 | |
2bf64758 JB |
2081 | spin_lock(&root->fs_info->free_chunk_lock); |
2082 | root->fs_info->free_chunk_space += device->total_bytes; | |
2083 | spin_unlock(&root->fs_info->free_chunk_lock); | |
2084 | ||
c289811c CM |
2085 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
2086 | root->fs_info->fs_devices->rotating = 1; | |
2087 | ||
6c41761f DS |
2088 | total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy); |
2089 | btrfs_set_super_total_bytes(root->fs_info->super_copy, | |
788f20eb CM |
2090 | total_bytes + device->total_bytes); |
2091 | ||
6c41761f DS |
2092 | total_bytes = btrfs_super_num_devices(root->fs_info->super_copy); |
2093 | btrfs_set_super_num_devices(root->fs_info->super_copy, | |
788f20eb | 2094 | total_bytes + 1); |
e5e9a520 | 2095 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 2096 | |
2b82032c YZ |
2097 | if (seeding_dev) { |
2098 | ret = init_first_rw_device(trans, root, device); | |
005d6427 DS |
2099 | if (ret) { |
2100 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 2101 | goto error_trans; |
005d6427 | 2102 | } |
2b82032c | 2103 | ret = btrfs_finish_sprout(trans, root); |
005d6427 DS |
2104 | if (ret) { |
2105 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 2106 | goto error_trans; |
005d6427 | 2107 | } |
2b82032c YZ |
2108 | } else { |
2109 | ret = btrfs_add_device(trans, root, device); | |
005d6427 DS |
2110 | if (ret) { |
2111 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 2112 | goto error_trans; |
005d6427 | 2113 | } |
2b82032c YZ |
2114 | } |
2115 | ||
913d952e CM |
2116 | /* |
2117 | * we've got more storage, clear any full flags on the space | |
2118 | * infos | |
2119 | */ | |
2120 | btrfs_clear_space_info_full(root->fs_info); | |
2121 | ||
7d9eb12c | 2122 | unlock_chunks(root); |
5af3e8cc SB |
2123 | root->fs_info->num_tolerated_disk_barrier_failures = |
2124 | btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info); | |
79787eaa | 2125 | ret = btrfs_commit_transaction(trans, root); |
a2135011 | 2126 | |
2b82032c YZ |
2127 | if (seeding_dev) { |
2128 | mutex_unlock(&uuid_mutex); | |
2129 | up_write(&sb->s_umount); | |
788f20eb | 2130 | |
79787eaa JM |
2131 | if (ret) /* transaction commit */ |
2132 | return ret; | |
2133 | ||
2b82032c | 2134 | ret = btrfs_relocate_sys_chunks(root); |
79787eaa JM |
2135 | if (ret < 0) |
2136 | btrfs_error(root->fs_info, ret, | |
2137 | "Failed to relocate sys chunks after " | |
2138 | "device initialization. This can be fixed " | |
2139 | "using the \"btrfs balance\" command."); | |
671415b7 MX |
2140 | trans = btrfs_attach_transaction(root); |
2141 | if (IS_ERR(trans)) { | |
2142 | if (PTR_ERR(trans) == -ENOENT) | |
2143 | return 0; | |
2144 | return PTR_ERR(trans); | |
2145 | } | |
2146 | ret = btrfs_commit_transaction(trans, root); | |
2b82032c | 2147 | } |
c9e9f97b | 2148 | |
2b82032c | 2149 | return ret; |
79787eaa JM |
2150 | |
2151 | error_trans: | |
2152 | unlock_chunks(root); | |
79787eaa | 2153 | btrfs_end_transaction(trans, root); |
606686ee | 2154 | rcu_string_free(device->name); |
79787eaa | 2155 | kfree(device); |
2b82032c | 2156 | error: |
e525fd89 | 2157 | blkdev_put(bdev, FMODE_EXCL); |
2b82032c YZ |
2158 | if (seeding_dev) { |
2159 | mutex_unlock(&uuid_mutex); | |
2160 | up_write(&sb->s_umount); | |
2161 | } | |
c9e9f97b | 2162 | return ret; |
788f20eb CM |
2163 | } |
2164 | ||
e93c89c1 SB |
2165 | int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path, |
2166 | struct btrfs_device **device_out) | |
2167 | { | |
2168 | struct request_queue *q; | |
2169 | struct btrfs_device *device; | |
2170 | struct block_device *bdev; | |
2171 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2172 | struct list_head *devices; | |
2173 | struct rcu_string *name; | |
12bd2fc0 | 2174 | u64 devid = BTRFS_DEV_REPLACE_DEVID; |
e93c89c1 SB |
2175 | int ret = 0; |
2176 | ||
2177 | *device_out = NULL; | |
2178 | if (fs_info->fs_devices->seeding) | |
2179 | return -EINVAL; | |
2180 | ||
2181 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, | |
2182 | fs_info->bdev_holder); | |
2183 | if (IS_ERR(bdev)) | |
2184 | return PTR_ERR(bdev); | |
2185 | ||
2186 | filemap_write_and_wait(bdev->bd_inode->i_mapping); | |
2187 | ||
2188 | devices = &fs_info->fs_devices->devices; | |
2189 | list_for_each_entry(device, devices, dev_list) { | |
2190 | if (device->bdev == bdev) { | |
2191 | ret = -EEXIST; | |
2192 | goto error; | |
2193 | } | |
2194 | } | |
2195 | ||
12bd2fc0 ID |
2196 | device = btrfs_alloc_device(NULL, &devid, NULL); |
2197 | if (IS_ERR(device)) { | |
2198 | ret = PTR_ERR(device); | |
e93c89c1 SB |
2199 | goto error; |
2200 | } | |
2201 | ||
2202 | name = rcu_string_strdup(device_path, GFP_NOFS); | |
2203 | if (!name) { | |
2204 | kfree(device); | |
2205 | ret = -ENOMEM; | |
2206 | goto error; | |
2207 | } | |
2208 | rcu_assign_pointer(device->name, name); | |
2209 | ||
2210 | q = bdev_get_queue(bdev); | |
2211 | if (blk_queue_discard(q)) | |
2212 | device->can_discard = 1; | |
2213 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2214 | device->writeable = 1; | |
e93c89c1 SB |
2215 | device->generation = 0; |
2216 | device->io_width = root->sectorsize; | |
2217 | device->io_align = root->sectorsize; | |
2218 | device->sector_size = root->sectorsize; | |
2219 | device->total_bytes = i_size_read(bdev->bd_inode); | |
2220 | device->disk_total_bytes = device->total_bytes; | |
2221 | device->dev_root = fs_info->dev_root; | |
2222 | device->bdev = bdev; | |
2223 | device->in_fs_metadata = 1; | |
2224 | device->is_tgtdev_for_dev_replace = 1; | |
2225 | device->mode = FMODE_EXCL; | |
27087f37 | 2226 | device->dev_stats_valid = 1; |
e93c89c1 SB |
2227 | set_blocksize(device->bdev, 4096); |
2228 | device->fs_devices = fs_info->fs_devices; | |
2229 | list_add(&device->dev_list, &fs_info->fs_devices->devices); | |
2230 | fs_info->fs_devices->num_devices++; | |
2231 | fs_info->fs_devices->open_devices++; | |
2232 | if (device->can_discard) | |
2233 | fs_info->fs_devices->num_can_discard++; | |
2234 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
2235 | ||
2236 | *device_out = device; | |
2237 | return ret; | |
2238 | ||
2239 | error: | |
2240 | blkdev_put(bdev, FMODE_EXCL); | |
2241 | return ret; | |
2242 | } | |
2243 | ||
2244 | void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info, | |
2245 | struct btrfs_device *tgtdev) | |
2246 | { | |
2247 | WARN_ON(fs_info->fs_devices->rw_devices == 0); | |
2248 | tgtdev->io_width = fs_info->dev_root->sectorsize; | |
2249 | tgtdev->io_align = fs_info->dev_root->sectorsize; | |
2250 | tgtdev->sector_size = fs_info->dev_root->sectorsize; | |
2251 | tgtdev->dev_root = fs_info->dev_root; | |
2252 | tgtdev->in_fs_metadata = 1; | |
2253 | } | |
2254 | ||
d397712b CM |
2255 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
2256 | struct btrfs_device *device) | |
0b86a832 CM |
2257 | { |
2258 | int ret; | |
2259 | struct btrfs_path *path; | |
2260 | struct btrfs_root *root; | |
2261 | struct btrfs_dev_item *dev_item; | |
2262 | struct extent_buffer *leaf; | |
2263 | struct btrfs_key key; | |
2264 | ||
2265 | root = device->dev_root->fs_info->chunk_root; | |
2266 | ||
2267 | path = btrfs_alloc_path(); | |
2268 | if (!path) | |
2269 | return -ENOMEM; | |
2270 | ||
2271 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
2272 | key.type = BTRFS_DEV_ITEM_KEY; | |
2273 | key.offset = device->devid; | |
2274 | ||
2275 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
2276 | if (ret < 0) | |
2277 | goto out; | |
2278 | ||
2279 | if (ret > 0) { | |
2280 | ret = -ENOENT; | |
2281 | goto out; | |
2282 | } | |
2283 | ||
2284 | leaf = path->nodes[0]; | |
2285 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
2286 | ||
2287 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2288 | btrfs_set_device_type(leaf, dev_item, device->type); | |
2289 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
2290 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
2291 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
d6397bae | 2292 | btrfs_set_device_total_bytes(leaf, dev_item, device->disk_total_bytes); |
0b86a832 CM |
2293 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); |
2294 | btrfs_mark_buffer_dirty(leaf); | |
2295 | ||
2296 | out: | |
2297 | btrfs_free_path(path); | |
2298 | return ret; | |
2299 | } | |
2300 | ||
7d9eb12c | 2301 | static int __btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
2302 | struct btrfs_device *device, u64 new_size) |
2303 | { | |
2304 | struct btrfs_super_block *super_copy = | |
6c41761f | 2305 | device->dev_root->fs_info->super_copy; |
8f18cf13 CM |
2306 | u64 old_total = btrfs_super_total_bytes(super_copy); |
2307 | u64 diff = new_size - device->total_bytes; | |
2308 | ||
2b82032c YZ |
2309 | if (!device->writeable) |
2310 | return -EACCES; | |
63a212ab SB |
2311 | if (new_size <= device->total_bytes || |
2312 | device->is_tgtdev_for_dev_replace) | |
2b82032c YZ |
2313 | return -EINVAL; |
2314 | ||
8f18cf13 | 2315 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
2b82032c YZ |
2316 | device->fs_devices->total_rw_bytes += diff; |
2317 | ||
2318 | device->total_bytes = new_size; | |
9779b72f | 2319 | device->disk_total_bytes = new_size; |
4184ea7f CM |
2320 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
2321 | ||
8f18cf13 CM |
2322 | return btrfs_update_device(trans, device); |
2323 | } | |
2324 | ||
7d9eb12c CM |
2325 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
2326 | struct btrfs_device *device, u64 new_size) | |
2327 | { | |
2328 | int ret; | |
2329 | lock_chunks(device->dev_root); | |
2330 | ret = __btrfs_grow_device(trans, device, new_size); | |
2331 | unlock_chunks(device->dev_root); | |
2332 | return ret; | |
2333 | } | |
2334 | ||
8f18cf13 CM |
2335 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, |
2336 | struct btrfs_root *root, | |
2337 | u64 chunk_tree, u64 chunk_objectid, | |
2338 | u64 chunk_offset) | |
2339 | { | |
2340 | int ret; | |
2341 | struct btrfs_path *path; | |
2342 | struct btrfs_key key; | |
2343 | ||
2344 | root = root->fs_info->chunk_root; | |
2345 | path = btrfs_alloc_path(); | |
2346 | if (!path) | |
2347 | return -ENOMEM; | |
2348 | ||
2349 | key.objectid = chunk_objectid; | |
2350 | key.offset = chunk_offset; | |
2351 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2352 | ||
2353 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
79787eaa JM |
2354 | if (ret < 0) |
2355 | goto out; | |
2356 | else if (ret > 0) { /* Logic error or corruption */ | |
2357 | btrfs_error(root->fs_info, -ENOENT, | |
2358 | "Failed lookup while freeing chunk."); | |
2359 | ret = -ENOENT; | |
2360 | goto out; | |
2361 | } | |
8f18cf13 CM |
2362 | |
2363 | ret = btrfs_del_item(trans, root, path); | |
79787eaa JM |
2364 | if (ret < 0) |
2365 | btrfs_error(root->fs_info, ret, | |
2366 | "Failed to delete chunk item."); | |
2367 | out: | |
8f18cf13 | 2368 | btrfs_free_path(path); |
65a246c5 | 2369 | return ret; |
8f18cf13 CM |
2370 | } |
2371 | ||
b2950863 | 2372 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
8f18cf13 CM |
2373 | chunk_offset) |
2374 | { | |
6c41761f | 2375 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 CM |
2376 | struct btrfs_disk_key *disk_key; |
2377 | struct btrfs_chunk *chunk; | |
2378 | u8 *ptr; | |
2379 | int ret = 0; | |
2380 | u32 num_stripes; | |
2381 | u32 array_size; | |
2382 | u32 len = 0; | |
2383 | u32 cur; | |
2384 | struct btrfs_key key; | |
2385 | ||
2386 | array_size = btrfs_super_sys_array_size(super_copy); | |
2387 | ||
2388 | ptr = super_copy->sys_chunk_array; | |
2389 | cur = 0; | |
2390 | ||
2391 | while (cur < array_size) { | |
2392 | disk_key = (struct btrfs_disk_key *)ptr; | |
2393 | btrfs_disk_key_to_cpu(&key, disk_key); | |
2394 | ||
2395 | len = sizeof(*disk_key); | |
2396 | ||
2397 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
2398 | chunk = (struct btrfs_chunk *)(ptr + len); | |
2399 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
2400 | len += btrfs_chunk_item_size(num_stripes); | |
2401 | } else { | |
2402 | ret = -EIO; | |
2403 | break; | |
2404 | } | |
2405 | if (key.objectid == chunk_objectid && | |
2406 | key.offset == chunk_offset) { | |
2407 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
2408 | array_size -= len; | |
2409 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
2410 | } else { | |
2411 | ptr += len; | |
2412 | cur += len; | |
2413 | } | |
2414 | } | |
2415 | return ret; | |
2416 | } | |
2417 | ||
b2950863 | 2418 | static int btrfs_relocate_chunk(struct btrfs_root *root, |
8f18cf13 CM |
2419 | u64 chunk_tree, u64 chunk_objectid, |
2420 | u64 chunk_offset) | |
2421 | { | |
2422 | struct extent_map_tree *em_tree; | |
2423 | struct btrfs_root *extent_root; | |
2424 | struct btrfs_trans_handle *trans; | |
2425 | struct extent_map *em; | |
2426 | struct map_lookup *map; | |
2427 | int ret; | |
2428 | int i; | |
2429 | ||
2430 | root = root->fs_info->chunk_root; | |
2431 | extent_root = root->fs_info->extent_root; | |
2432 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
2433 | ||
ba1bf481 JB |
2434 | ret = btrfs_can_relocate(extent_root, chunk_offset); |
2435 | if (ret) | |
2436 | return -ENOSPC; | |
2437 | ||
8f18cf13 | 2438 | /* step one, relocate all the extents inside this chunk */ |
1a40e23b | 2439 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); |
a22285a6 YZ |
2440 | if (ret) |
2441 | return ret; | |
8f18cf13 | 2442 | |
a22285a6 | 2443 | trans = btrfs_start_transaction(root, 0); |
0f788c58 LB |
2444 | if (IS_ERR(trans)) { |
2445 | ret = PTR_ERR(trans); | |
2446 | btrfs_std_error(root->fs_info, ret); | |
2447 | return ret; | |
2448 | } | |
8f18cf13 | 2449 | |
7d9eb12c CM |
2450 | lock_chunks(root); |
2451 | ||
8f18cf13 CM |
2452 | /* |
2453 | * step two, delete the device extents and the | |
2454 | * chunk tree entries | |
2455 | */ | |
890871be | 2456 | read_lock(&em_tree->lock); |
8f18cf13 | 2457 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); |
890871be | 2458 | read_unlock(&em_tree->lock); |
8f18cf13 | 2459 | |
285190d9 | 2460 | BUG_ON(!em || em->start > chunk_offset || |
a061fc8d | 2461 | em->start + em->len < chunk_offset); |
8f18cf13 CM |
2462 | map = (struct map_lookup *)em->bdev; |
2463 | ||
2464 | for (i = 0; i < map->num_stripes; i++) { | |
2465 | ret = btrfs_free_dev_extent(trans, map->stripes[i].dev, | |
2466 | map->stripes[i].physical); | |
2467 | BUG_ON(ret); | |
a061fc8d | 2468 | |
dfe25020 CM |
2469 | if (map->stripes[i].dev) { |
2470 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
2471 | BUG_ON(ret); | |
2472 | } | |
8f18cf13 CM |
2473 | } |
2474 | ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid, | |
2475 | chunk_offset); | |
2476 | ||
2477 | BUG_ON(ret); | |
2478 | ||
1abe9b8a | 2479 | trace_btrfs_chunk_free(root, map, chunk_offset, em->len); |
2480 | ||
8f18cf13 CM |
2481 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2482 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
2483 | BUG_ON(ret); | |
8f18cf13 CM |
2484 | } |
2485 | ||
2b82032c YZ |
2486 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset); |
2487 | BUG_ON(ret); | |
2488 | ||
890871be | 2489 | write_lock(&em_tree->lock); |
2b82032c | 2490 | remove_extent_mapping(em_tree, em); |
890871be | 2491 | write_unlock(&em_tree->lock); |
2b82032c YZ |
2492 | |
2493 | kfree(map); | |
2494 | em->bdev = NULL; | |
2495 | ||
2496 | /* once for the tree */ | |
2497 | free_extent_map(em); | |
2498 | /* once for us */ | |
2499 | free_extent_map(em); | |
2500 | ||
2501 | unlock_chunks(root); | |
2502 | btrfs_end_transaction(trans, root); | |
2503 | return 0; | |
2504 | } | |
2505 | ||
2506 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) | |
2507 | { | |
2508 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; | |
2509 | struct btrfs_path *path; | |
2510 | struct extent_buffer *leaf; | |
2511 | struct btrfs_chunk *chunk; | |
2512 | struct btrfs_key key; | |
2513 | struct btrfs_key found_key; | |
2514 | u64 chunk_tree = chunk_root->root_key.objectid; | |
2515 | u64 chunk_type; | |
ba1bf481 JB |
2516 | bool retried = false; |
2517 | int failed = 0; | |
2b82032c YZ |
2518 | int ret; |
2519 | ||
2520 | path = btrfs_alloc_path(); | |
2521 | if (!path) | |
2522 | return -ENOMEM; | |
2523 | ||
ba1bf481 | 2524 | again: |
2b82032c YZ |
2525 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2526 | key.offset = (u64)-1; | |
2527 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2528 | ||
2529 | while (1) { | |
2530 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); | |
2531 | if (ret < 0) | |
2532 | goto error; | |
79787eaa | 2533 | BUG_ON(ret == 0); /* Corruption */ |
2b82032c YZ |
2534 | |
2535 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
2536 | key.type); | |
2537 | if (ret < 0) | |
2538 | goto error; | |
2539 | if (ret > 0) | |
2540 | break; | |
1a40e23b | 2541 | |
2b82032c YZ |
2542 | leaf = path->nodes[0]; |
2543 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 2544 | |
2b82032c YZ |
2545 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
2546 | struct btrfs_chunk); | |
2547 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
b3b4aa74 | 2548 | btrfs_release_path(path); |
8f18cf13 | 2549 | |
2b82032c YZ |
2550 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2551 | ret = btrfs_relocate_chunk(chunk_root, chunk_tree, | |
2552 | found_key.objectid, | |
2553 | found_key.offset); | |
ba1bf481 JB |
2554 | if (ret == -ENOSPC) |
2555 | failed++; | |
2556 | else if (ret) | |
2557 | BUG(); | |
2b82032c | 2558 | } |
8f18cf13 | 2559 | |
2b82032c YZ |
2560 | if (found_key.offset == 0) |
2561 | break; | |
2562 | key.offset = found_key.offset - 1; | |
2563 | } | |
2564 | ret = 0; | |
ba1bf481 JB |
2565 | if (failed && !retried) { |
2566 | failed = 0; | |
2567 | retried = true; | |
2568 | goto again; | |
fae7f21c | 2569 | } else if (WARN_ON(failed && retried)) { |
ba1bf481 JB |
2570 | ret = -ENOSPC; |
2571 | } | |
2b82032c YZ |
2572 | error: |
2573 | btrfs_free_path(path); | |
2574 | return ret; | |
8f18cf13 CM |
2575 | } |
2576 | ||
0940ebf6 ID |
2577 | static int insert_balance_item(struct btrfs_root *root, |
2578 | struct btrfs_balance_control *bctl) | |
2579 | { | |
2580 | struct btrfs_trans_handle *trans; | |
2581 | struct btrfs_balance_item *item; | |
2582 | struct btrfs_disk_balance_args disk_bargs; | |
2583 | struct btrfs_path *path; | |
2584 | struct extent_buffer *leaf; | |
2585 | struct btrfs_key key; | |
2586 | int ret, err; | |
2587 | ||
2588 | path = btrfs_alloc_path(); | |
2589 | if (!path) | |
2590 | return -ENOMEM; | |
2591 | ||
2592 | trans = btrfs_start_transaction(root, 0); | |
2593 | if (IS_ERR(trans)) { | |
2594 | btrfs_free_path(path); | |
2595 | return PTR_ERR(trans); | |
2596 | } | |
2597 | ||
2598 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
2599 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
2600 | key.offset = 0; | |
2601 | ||
2602 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
2603 | sizeof(*item)); | |
2604 | if (ret) | |
2605 | goto out; | |
2606 | ||
2607 | leaf = path->nodes[0]; | |
2608 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
2609 | ||
2610 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
2611 | ||
2612 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data); | |
2613 | btrfs_set_balance_data(leaf, item, &disk_bargs); | |
2614 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->meta); | |
2615 | btrfs_set_balance_meta(leaf, item, &disk_bargs); | |
2616 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->sys); | |
2617 | btrfs_set_balance_sys(leaf, item, &disk_bargs); | |
2618 | ||
2619 | btrfs_set_balance_flags(leaf, item, bctl->flags); | |
2620 | ||
2621 | btrfs_mark_buffer_dirty(leaf); | |
2622 | out: | |
2623 | btrfs_free_path(path); | |
2624 | err = btrfs_commit_transaction(trans, root); | |
2625 | if (err && !ret) | |
2626 | ret = err; | |
2627 | return ret; | |
2628 | } | |
2629 | ||
2630 | static int del_balance_item(struct btrfs_root *root) | |
2631 | { | |
2632 | struct btrfs_trans_handle *trans; | |
2633 | struct btrfs_path *path; | |
2634 | struct btrfs_key key; | |
2635 | int ret, err; | |
2636 | ||
2637 | path = btrfs_alloc_path(); | |
2638 | if (!path) | |
2639 | return -ENOMEM; | |
2640 | ||
2641 | trans = btrfs_start_transaction(root, 0); | |
2642 | if (IS_ERR(trans)) { | |
2643 | btrfs_free_path(path); | |
2644 | return PTR_ERR(trans); | |
2645 | } | |
2646 | ||
2647 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
2648 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
2649 | key.offset = 0; | |
2650 | ||
2651 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
2652 | if (ret < 0) | |
2653 | goto out; | |
2654 | if (ret > 0) { | |
2655 | ret = -ENOENT; | |
2656 | goto out; | |
2657 | } | |
2658 | ||
2659 | ret = btrfs_del_item(trans, root, path); | |
2660 | out: | |
2661 | btrfs_free_path(path); | |
2662 | err = btrfs_commit_transaction(trans, root); | |
2663 | if (err && !ret) | |
2664 | ret = err; | |
2665 | return ret; | |
2666 | } | |
2667 | ||
59641015 ID |
2668 | /* |
2669 | * This is a heuristic used to reduce the number of chunks balanced on | |
2670 | * resume after balance was interrupted. | |
2671 | */ | |
2672 | static void update_balance_args(struct btrfs_balance_control *bctl) | |
2673 | { | |
2674 | /* | |
2675 | * Turn on soft mode for chunk types that were being converted. | |
2676 | */ | |
2677 | if (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
2678 | bctl->data.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
2679 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
2680 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
2681 | if (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
2682 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
2683 | ||
2684 | /* | |
2685 | * Turn on usage filter if is not already used. The idea is | |
2686 | * that chunks that we have already balanced should be | |
2687 | * reasonably full. Don't do it for chunks that are being | |
2688 | * converted - that will keep us from relocating unconverted | |
2689 | * (albeit full) chunks. | |
2690 | */ | |
2691 | if (!(bctl->data.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2692 | !(bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
2693 | bctl->data.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
2694 | bctl->data.usage = 90; | |
2695 | } | |
2696 | if (!(bctl->sys.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2697 | !(bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
2698 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
2699 | bctl->sys.usage = 90; | |
2700 | } | |
2701 | if (!(bctl->meta.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2702 | !(bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
2703 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
2704 | bctl->meta.usage = 90; | |
2705 | } | |
2706 | } | |
2707 | ||
c9e9f97b ID |
2708 | /* |
2709 | * Should be called with both balance and volume mutexes held to | |
2710 | * serialize other volume operations (add_dev/rm_dev/resize) with | |
2711 | * restriper. Same goes for unset_balance_control. | |
2712 | */ | |
2713 | static void set_balance_control(struct btrfs_balance_control *bctl) | |
2714 | { | |
2715 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
2716 | ||
2717 | BUG_ON(fs_info->balance_ctl); | |
2718 | ||
2719 | spin_lock(&fs_info->balance_lock); | |
2720 | fs_info->balance_ctl = bctl; | |
2721 | spin_unlock(&fs_info->balance_lock); | |
2722 | } | |
2723 | ||
2724 | static void unset_balance_control(struct btrfs_fs_info *fs_info) | |
2725 | { | |
2726 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
2727 | ||
2728 | BUG_ON(!fs_info->balance_ctl); | |
2729 | ||
2730 | spin_lock(&fs_info->balance_lock); | |
2731 | fs_info->balance_ctl = NULL; | |
2732 | spin_unlock(&fs_info->balance_lock); | |
2733 | ||
2734 | kfree(bctl); | |
2735 | } | |
2736 | ||
ed25e9b2 ID |
2737 | /* |
2738 | * Balance filters. Return 1 if chunk should be filtered out | |
2739 | * (should not be balanced). | |
2740 | */ | |
899c81ea | 2741 | static int chunk_profiles_filter(u64 chunk_type, |
ed25e9b2 ID |
2742 | struct btrfs_balance_args *bargs) |
2743 | { | |
899c81ea ID |
2744 | chunk_type = chunk_to_extended(chunk_type) & |
2745 | BTRFS_EXTENDED_PROFILE_MASK; | |
ed25e9b2 | 2746 | |
899c81ea | 2747 | if (bargs->profiles & chunk_type) |
ed25e9b2 ID |
2748 | return 0; |
2749 | ||
2750 | return 1; | |
2751 | } | |
2752 | ||
5ce5b3c0 ID |
2753 | static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset, |
2754 | struct btrfs_balance_args *bargs) | |
2755 | { | |
2756 | struct btrfs_block_group_cache *cache; | |
2757 | u64 chunk_used, user_thresh; | |
2758 | int ret = 1; | |
2759 | ||
2760 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
2761 | chunk_used = btrfs_block_group_used(&cache->item); | |
2762 | ||
a105bb88 | 2763 | if (bargs->usage == 0) |
3e39cea6 | 2764 | user_thresh = 1; |
a105bb88 ID |
2765 | else if (bargs->usage > 100) |
2766 | user_thresh = cache->key.offset; | |
2767 | else | |
2768 | user_thresh = div_factor_fine(cache->key.offset, | |
2769 | bargs->usage); | |
2770 | ||
5ce5b3c0 ID |
2771 | if (chunk_used < user_thresh) |
2772 | ret = 0; | |
2773 | ||
2774 | btrfs_put_block_group(cache); | |
2775 | return ret; | |
2776 | } | |
2777 | ||
409d404b ID |
2778 | static int chunk_devid_filter(struct extent_buffer *leaf, |
2779 | struct btrfs_chunk *chunk, | |
2780 | struct btrfs_balance_args *bargs) | |
2781 | { | |
2782 | struct btrfs_stripe *stripe; | |
2783 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
2784 | int i; | |
2785 | ||
2786 | for (i = 0; i < num_stripes; i++) { | |
2787 | stripe = btrfs_stripe_nr(chunk, i); | |
2788 | if (btrfs_stripe_devid(leaf, stripe) == bargs->devid) | |
2789 | return 0; | |
2790 | } | |
2791 | ||
2792 | return 1; | |
2793 | } | |
2794 | ||
94e60d5a ID |
2795 | /* [pstart, pend) */ |
2796 | static int chunk_drange_filter(struct extent_buffer *leaf, | |
2797 | struct btrfs_chunk *chunk, | |
2798 | u64 chunk_offset, | |
2799 | struct btrfs_balance_args *bargs) | |
2800 | { | |
2801 | struct btrfs_stripe *stripe; | |
2802 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
2803 | u64 stripe_offset; | |
2804 | u64 stripe_length; | |
2805 | int factor; | |
2806 | int i; | |
2807 | ||
2808 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_DEVID)) | |
2809 | return 0; | |
2810 | ||
2811 | if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP | | |
53b381b3 DW |
2812 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)) { |
2813 | factor = num_stripes / 2; | |
2814 | } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID5) { | |
2815 | factor = num_stripes - 1; | |
2816 | } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID6) { | |
2817 | factor = num_stripes - 2; | |
2818 | } else { | |
2819 | factor = num_stripes; | |
2820 | } | |
94e60d5a ID |
2821 | |
2822 | for (i = 0; i < num_stripes; i++) { | |
2823 | stripe = btrfs_stripe_nr(chunk, i); | |
2824 | if (btrfs_stripe_devid(leaf, stripe) != bargs->devid) | |
2825 | continue; | |
2826 | ||
2827 | stripe_offset = btrfs_stripe_offset(leaf, stripe); | |
2828 | stripe_length = btrfs_chunk_length(leaf, chunk); | |
2829 | do_div(stripe_length, factor); | |
2830 | ||
2831 | if (stripe_offset < bargs->pend && | |
2832 | stripe_offset + stripe_length > bargs->pstart) | |
2833 | return 0; | |
2834 | } | |
2835 | ||
2836 | return 1; | |
2837 | } | |
2838 | ||
ea67176a ID |
2839 | /* [vstart, vend) */ |
2840 | static int chunk_vrange_filter(struct extent_buffer *leaf, | |
2841 | struct btrfs_chunk *chunk, | |
2842 | u64 chunk_offset, | |
2843 | struct btrfs_balance_args *bargs) | |
2844 | { | |
2845 | if (chunk_offset < bargs->vend && | |
2846 | chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart) | |
2847 | /* at least part of the chunk is inside this vrange */ | |
2848 | return 0; | |
2849 | ||
2850 | return 1; | |
2851 | } | |
2852 | ||
899c81ea | 2853 | static int chunk_soft_convert_filter(u64 chunk_type, |
cfa4c961 ID |
2854 | struct btrfs_balance_args *bargs) |
2855 | { | |
2856 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT)) | |
2857 | return 0; | |
2858 | ||
899c81ea ID |
2859 | chunk_type = chunk_to_extended(chunk_type) & |
2860 | BTRFS_EXTENDED_PROFILE_MASK; | |
cfa4c961 | 2861 | |
899c81ea | 2862 | if (bargs->target == chunk_type) |
cfa4c961 ID |
2863 | return 1; |
2864 | ||
2865 | return 0; | |
2866 | } | |
2867 | ||
f43ffb60 ID |
2868 | static int should_balance_chunk(struct btrfs_root *root, |
2869 | struct extent_buffer *leaf, | |
2870 | struct btrfs_chunk *chunk, u64 chunk_offset) | |
2871 | { | |
2872 | struct btrfs_balance_control *bctl = root->fs_info->balance_ctl; | |
2873 | struct btrfs_balance_args *bargs = NULL; | |
2874 | u64 chunk_type = btrfs_chunk_type(leaf, chunk); | |
2875 | ||
2876 | /* type filter */ | |
2877 | if (!((chunk_type & BTRFS_BLOCK_GROUP_TYPE_MASK) & | |
2878 | (bctl->flags & BTRFS_BALANCE_TYPE_MASK))) { | |
2879 | return 0; | |
2880 | } | |
2881 | ||
2882 | if (chunk_type & BTRFS_BLOCK_GROUP_DATA) | |
2883 | bargs = &bctl->data; | |
2884 | else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) | |
2885 | bargs = &bctl->sys; | |
2886 | else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA) | |
2887 | bargs = &bctl->meta; | |
2888 | ||
ed25e9b2 ID |
2889 | /* profiles filter */ |
2890 | if ((bargs->flags & BTRFS_BALANCE_ARGS_PROFILES) && | |
2891 | chunk_profiles_filter(chunk_type, bargs)) { | |
2892 | return 0; | |
5ce5b3c0 ID |
2893 | } |
2894 | ||
2895 | /* usage filter */ | |
2896 | if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2897 | chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) { | |
2898 | return 0; | |
409d404b ID |
2899 | } |
2900 | ||
2901 | /* devid filter */ | |
2902 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DEVID) && | |
2903 | chunk_devid_filter(leaf, chunk, bargs)) { | |
2904 | return 0; | |
94e60d5a ID |
2905 | } |
2906 | ||
2907 | /* drange filter, makes sense only with devid filter */ | |
2908 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) && | |
2909 | chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) { | |
2910 | return 0; | |
ea67176a ID |
2911 | } |
2912 | ||
2913 | /* vrange filter */ | |
2914 | if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) && | |
2915 | chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) { | |
2916 | return 0; | |
ed25e9b2 ID |
2917 | } |
2918 | ||
cfa4c961 ID |
2919 | /* soft profile changing mode */ |
2920 | if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) && | |
2921 | chunk_soft_convert_filter(chunk_type, bargs)) { | |
2922 | return 0; | |
2923 | } | |
2924 | ||
f43ffb60 ID |
2925 | return 1; |
2926 | } | |
2927 | ||
c9e9f97b | 2928 | static int __btrfs_balance(struct btrfs_fs_info *fs_info) |
ec44a35c | 2929 | { |
19a39dce | 2930 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
c9e9f97b ID |
2931 | struct btrfs_root *chunk_root = fs_info->chunk_root; |
2932 | struct btrfs_root *dev_root = fs_info->dev_root; | |
2933 | struct list_head *devices; | |
ec44a35c CM |
2934 | struct btrfs_device *device; |
2935 | u64 old_size; | |
2936 | u64 size_to_free; | |
f43ffb60 | 2937 | struct btrfs_chunk *chunk; |
ec44a35c CM |
2938 | struct btrfs_path *path; |
2939 | struct btrfs_key key; | |
ec44a35c | 2940 | struct btrfs_key found_key; |
c9e9f97b | 2941 | struct btrfs_trans_handle *trans; |
f43ffb60 ID |
2942 | struct extent_buffer *leaf; |
2943 | int slot; | |
c9e9f97b ID |
2944 | int ret; |
2945 | int enospc_errors = 0; | |
19a39dce | 2946 | bool counting = true; |
ec44a35c | 2947 | |
ec44a35c | 2948 | /* step one make some room on all the devices */ |
c9e9f97b | 2949 | devices = &fs_info->fs_devices->devices; |
c6e30871 | 2950 | list_for_each_entry(device, devices, dev_list) { |
ec44a35c CM |
2951 | old_size = device->total_bytes; |
2952 | size_to_free = div_factor(old_size, 1); | |
2953 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
2b82032c | 2954 | if (!device->writeable || |
63a212ab SB |
2955 | device->total_bytes - device->bytes_used > size_to_free || |
2956 | device->is_tgtdev_for_dev_replace) | |
ec44a35c CM |
2957 | continue; |
2958 | ||
2959 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
ba1bf481 JB |
2960 | if (ret == -ENOSPC) |
2961 | break; | |
ec44a35c CM |
2962 | BUG_ON(ret); |
2963 | ||
a22285a6 | 2964 | trans = btrfs_start_transaction(dev_root, 0); |
98d5dc13 | 2965 | BUG_ON(IS_ERR(trans)); |
ec44a35c CM |
2966 | |
2967 | ret = btrfs_grow_device(trans, device, old_size); | |
2968 | BUG_ON(ret); | |
2969 | ||
2970 | btrfs_end_transaction(trans, dev_root); | |
2971 | } | |
2972 | ||
2973 | /* step two, relocate all the chunks */ | |
2974 | path = btrfs_alloc_path(); | |
17e9f796 MF |
2975 | if (!path) { |
2976 | ret = -ENOMEM; | |
2977 | goto error; | |
2978 | } | |
19a39dce ID |
2979 | |
2980 | /* zero out stat counters */ | |
2981 | spin_lock(&fs_info->balance_lock); | |
2982 | memset(&bctl->stat, 0, sizeof(bctl->stat)); | |
2983 | spin_unlock(&fs_info->balance_lock); | |
2984 | again: | |
ec44a35c CM |
2985 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2986 | key.offset = (u64)-1; | |
2987 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2988 | ||
d397712b | 2989 | while (1) { |
19a39dce | 2990 | if ((!counting && atomic_read(&fs_info->balance_pause_req)) || |
a7e99c69 | 2991 | atomic_read(&fs_info->balance_cancel_req)) { |
837d5b6e ID |
2992 | ret = -ECANCELED; |
2993 | goto error; | |
2994 | } | |
2995 | ||
ec44a35c CM |
2996 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
2997 | if (ret < 0) | |
2998 | goto error; | |
2999 | ||
3000 | /* | |
3001 | * this shouldn't happen, it means the last relocate | |
3002 | * failed | |
3003 | */ | |
3004 | if (ret == 0) | |
c9e9f97b | 3005 | BUG(); /* FIXME break ? */ |
ec44a35c CM |
3006 | |
3007 | ret = btrfs_previous_item(chunk_root, path, 0, | |
3008 | BTRFS_CHUNK_ITEM_KEY); | |
c9e9f97b ID |
3009 | if (ret) { |
3010 | ret = 0; | |
ec44a35c | 3011 | break; |
c9e9f97b | 3012 | } |
7d9eb12c | 3013 | |
f43ffb60 ID |
3014 | leaf = path->nodes[0]; |
3015 | slot = path->slots[0]; | |
3016 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
7d9eb12c | 3017 | |
ec44a35c CM |
3018 | if (found_key.objectid != key.objectid) |
3019 | break; | |
7d9eb12c | 3020 | |
f43ffb60 ID |
3021 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); |
3022 | ||
19a39dce ID |
3023 | if (!counting) { |
3024 | spin_lock(&fs_info->balance_lock); | |
3025 | bctl->stat.considered++; | |
3026 | spin_unlock(&fs_info->balance_lock); | |
3027 | } | |
3028 | ||
f43ffb60 ID |
3029 | ret = should_balance_chunk(chunk_root, leaf, chunk, |
3030 | found_key.offset); | |
b3b4aa74 | 3031 | btrfs_release_path(path); |
f43ffb60 ID |
3032 | if (!ret) |
3033 | goto loop; | |
3034 | ||
19a39dce ID |
3035 | if (counting) { |
3036 | spin_lock(&fs_info->balance_lock); | |
3037 | bctl->stat.expected++; | |
3038 | spin_unlock(&fs_info->balance_lock); | |
3039 | goto loop; | |
3040 | } | |
3041 | ||
ec44a35c CM |
3042 | ret = btrfs_relocate_chunk(chunk_root, |
3043 | chunk_root->root_key.objectid, | |
3044 | found_key.objectid, | |
3045 | found_key.offset); | |
508794eb JB |
3046 | if (ret && ret != -ENOSPC) |
3047 | goto error; | |
19a39dce | 3048 | if (ret == -ENOSPC) { |
c9e9f97b | 3049 | enospc_errors++; |
19a39dce ID |
3050 | } else { |
3051 | spin_lock(&fs_info->balance_lock); | |
3052 | bctl->stat.completed++; | |
3053 | spin_unlock(&fs_info->balance_lock); | |
3054 | } | |
f43ffb60 | 3055 | loop: |
795a3321 ID |
3056 | if (found_key.offset == 0) |
3057 | break; | |
ba1bf481 | 3058 | key.offset = found_key.offset - 1; |
ec44a35c | 3059 | } |
c9e9f97b | 3060 | |
19a39dce ID |
3061 | if (counting) { |
3062 | btrfs_release_path(path); | |
3063 | counting = false; | |
3064 | goto again; | |
3065 | } | |
ec44a35c CM |
3066 | error: |
3067 | btrfs_free_path(path); | |
c9e9f97b | 3068 | if (enospc_errors) { |
efe120a0 | 3069 | btrfs_info(fs_info, "%d enospc errors during balance", |
c9e9f97b ID |
3070 | enospc_errors); |
3071 | if (!ret) | |
3072 | ret = -ENOSPC; | |
3073 | } | |
3074 | ||
ec44a35c CM |
3075 | return ret; |
3076 | } | |
3077 | ||
0c460c0d ID |
3078 | /** |
3079 | * alloc_profile_is_valid - see if a given profile is valid and reduced | |
3080 | * @flags: profile to validate | |
3081 | * @extended: if true @flags is treated as an extended profile | |
3082 | */ | |
3083 | static int alloc_profile_is_valid(u64 flags, int extended) | |
3084 | { | |
3085 | u64 mask = (extended ? BTRFS_EXTENDED_PROFILE_MASK : | |
3086 | BTRFS_BLOCK_GROUP_PROFILE_MASK); | |
3087 | ||
3088 | flags &= ~BTRFS_BLOCK_GROUP_TYPE_MASK; | |
3089 | ||
3090 | /* 1) check that all other bits are zeroed */ | |
3091 | if (flags & ~mask) | |
3092 | return 0; | |
3093 | ||
3094 | /* 2) see if profile is reduced */ | |
3095 | if (flags == 0) | |
3096 | return !extended; /* "0" is valid for usual profiles */ | |
3097 | ||
3098 | /* true if exactly one bit set */ | |
3099 | return (flags & (flags - 1)) == 0; | |
3100 | } | |
3101 | ||
837d5b6e ID |
3102 | static inline int balance_need_close(struct btrfs_fs_info *fs_info) |
3103 | { | |
a7e99c69 ID |
3104 | /* cancel requested || normal exit path */ |
3105 | return atomic_read(&fs_info->balance_cancel_req) || | |
3106 | (atomic_read(&fs_info->balance_pause_req) == 0 && | |
3107 | atomic_read(&fs_info->balance_cancel_req) == 0); | |
837d5b6e ID |
3108 | } |
3109 | ||
c9e9f97b ID |
3110 | static void __cancel_balance(struct btrfs_fs_info *fs_info) |
3111 | { | |
0940ebf6 ID |
3112 | int ret; |
3113 | ||
c9e9f97b | 3114 | unset_balance_control(fs_info); |
0940ebf6 | 3115 | ret = del_balance_item(fs_info->tree_root); |
0f788c58 LB |
3116 | if (ret) |
3117 | btrfs_std_error(fs_info, ret); | |
ed0fb78f ID |
3118 | |
3119 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
c9e9f97b ID |
3120 | } |
3121 | ||
c9e9f97b ID |
3122 | /* |
3123 | * Should be called with both balance and volume mutexes held | |
3124 | */ | |
3125 | int btrfs_balance(struct btrfs_balance_control *bctl, | |
3126 | struct btrfs_ioctl_balance_args *bargs) | |
3127 | { | |
3128 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
f43ffb60 | 3129 | u64 allowed; |
e4837f8f | 3130 | int mixed = 0; |
c9e9f97b | 3131 | int ret; |
8dabb742 | 3132 | u64 num_devices; |
de98ced9 | 3133 | unsigned seq; |
c9e9f97b | 3134 | |
837d5b6e | 3135 | if (btrfs_fs_closing(fs_info) || |
a7e99c69 ID |
3136 | atomic_read(&fs_info->balance_pause_req) || |
3137 | atomic_read(&fs_info->balance_cancel_req)) { | |
c9e9f97b ID |
3138 | ret = -EINVAL; |
3139 | goto out; | |
3140 | } | |
3141 | ||
e4837f8f ID |
3142 | allowed = btrfs_super_incompat_flags(fs_info->super_copy); |
3143 | if (allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
3144 | mixed = 1; | |
3145 | ||
f43ffb60 ID |
3146 | /* |
3147 | * In case of mixed groups both data and meta should be picked, | |
3148 | * and identical options should be given for both of them. | |
3149 | */ | |
e4837f8f ID |
3150 | allowed = BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA; |
3151 | if (mixed && (bctl->flags & allowed)) { | |
f43ffb60 ID |
3152 | if (!(bctl->flags & BTRFS_BALANCE_DATA) || |
3153 | !(bctl->flags & BTRFS_BALANCE_METADATA) || | |
3154 | memcmp(&bctl->data, &bctl->meta, sizeof(bctl->data))) { | |
efe120a0 FH |
3155 | btrfs_err(fs_info, "with mixed groups data and " |
3156 | "metadata balance options must be the same"); | |
f43ffb60 ID |
3157 | ret = -EINVAL; |
3158 | goto out; | |
3159 | } | |
3160 | } | |
3161 | ||
8dabb742 SB |
3162 | num_devices = fs_info->fs_devices->num_devices; |
3163 | btrfs_dev_replace_lock(&fs_info->dev_replace); | |
3164 | if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) { | |
3165 | BUG_ON(num_devices < 1); | |
3166 | num_devices--; | |
3167 | } | |
3168 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
e4d8ec0f | 3169 | allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE; |
8dabb742 | 3170 | if (num_devices == 1) |
e4d8ec0f | 3171 | allowed |= BTRFS_BLOCK_GROUP_DUP; |
8250dabe | 3172 | else if (num_devices > 1) |
e4d8ec0f | 3173 | allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1); |
8250dabe AP |
3174 | if (num_devices > 2) |
3175 | allowed |= BTRFS_BLOCK_GROUP_RAID5; | |
3176 | if (num_devices > 3) | |
3177 | allowed |= (BTRFS_BLOCK_GROUP_RAID10 | | |
3178 | BTRFS_BLOCK_GROUP_RAID6); | |
6728b198 ID |
3179 | if ((bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) && |
3180 | (!alloc_profile_is_valid(bctl->data.target, 1) || | |
3181 | (bctl->data.target & ~allowed))) { | |
efe120a0 FH |
3182 | btrfs_err(fs_info, "unable to start balance with target " |
3183 | "data profile %llu", | |
c1c9ff7c | 3184 | bctl->data.target); |
e4d8ec0f ID |
3185 | ret = -EINVAL; |
3186 | goto out; | |
3187 | } | |
6728b198 ID |
3188 | if ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) && |
3189 | (!alloc_profile_is_valid(bctl->meta.target, 1) || | |
3190 | (bctl->meta.target & ~allowed))) { | |
efe120a0 FH |
3191 | btrfs_err(fs_info, |
3192 | "unable to start balance with target metadata profile %llu", | |
c1c9ff7c | 3193 | bctl->meta.target); |
e4d8ec0f ID |
3194 | ret = -EINVAL; |
3195 | goto out; | |
3196 | } | |
6728b198 ID |
3197 | if ((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) && |
3198 | (!alloc_profile_is_valid(bctl->sys.target, 1) || | |
3199 | (bctl->sys.target & ~allowed))) { | |
efe120a0 FH |
3200 | btrfs_err(fs_info, |
3201 | "unable to start balance with target system profile %llu", | |
c1c9ff7c | 3202 | bctl->sys.target); |
e4d8ec0f ID |
3203 | ret = -EINVAL; |
3204 | goto out; | |
3205 | } | |
3206 | ||
e4837f8f ID |
3207 | /* allow dup'ed data chunks only in mixed mode */ |
3208 | if (!mixed && (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
6728b198 | 3209 | (bctl->data.target & BTRFS_BLOCK_GROUP_DUP)) { |
efe120a0 | 3210 | btrfs_err(fs_info, "dup for data is not allowed"); |
e4d8ec0f ID |
3211 | ret = -EINVAL; |
3212 | goto out; | |
3213 | } | |
3214 | ||
3215 | /* allow to reduce meta or sys integrity only if force set */ | |
3216 | allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
3217 | BTRFS_BLOCK_GROUP_RAID10 | |
3218 | BTRFS_BLOCK_GROUP_RAID5 | | |
3219 | BTRFS_BLOCK_GROUP_RAID6; | |
de98ced9 MX |
3220 | do { |
3221 | seq = read_seqbegin(&fs_info->profiles_lock); | |
3222 | ||
3223 | if (((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3224 | (fs_info->avail_system_alloc_bits & allowed) && | |
3225 | !(bctl->sys.target & allowed)) || | |
3226 | ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3227 | (fs_info->avail_metadata_alloc_bits & allowed) && | |
3228 | !(bctl->meta.target & allowed))) { | |
3229 | if (bctl->flags & BTRFS_BALANCE_FORCE) { | |
efe120a0 | 3230 | btrfs_info(fs_info, "force reducing metadata integrity"); |
de98ced9 | 3231 | } else { |
efe120a0 FH |
3232 | btrfs_err(fs_info, "balance will reduce metadata " |
3233 | "integrity, use force if you want this"); | |
de98ced9 MX |
3234 | ret = -EINVAL; |
3235 | goto out; | |
3236 | } | |
e4d8ec0f | 3237 | } |
de98ced9 | 3238 | } while (read_seqretry(&fs_info->profiles_lock, seq)); |
e4d8ec0f | 3239 | |
5af3e8cc SB |
3240 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
3241 | int num_tolerated_disk_barrier_failures; | |
3242 | u64 target = bctl->sys.target; | |
3243 | ||
3244 | num_tolerated_disk_barrier_failures = | |
3245 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); | |
3246 | if (num_tolerated_disk_barrier_failures > 0 && | |
3247 | (target & | |
3248 | (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | | |
3249 | BTRFS_AVAIL_ALLOC_BIT_SINGLE))) | |
3250 | num_tolerated_disk_barrier_failures = 0; | |
3251 | else if (num_tolerated_disk_barrier_failures > 1 && | |
3252 | (target & | |
3253 | (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10))) | |
3254 | num_tolerated_disk_barrier_failures = 1; | |
3255 | ||
3256 | fs_info->num_tolerated_disk_barrier_failures = | |
3257 | num_tolerated_disk_barrier_failures; | |
3258 | } | |
3259 | ||
0940ebf6 | 3260 | ret = insert_balance_item(fs_info->tree_root, bctl); |
59641015 | 3261 | if (ret && ret != -EEXIST) |
0940ebf6 ID |
3262 | goto out; |
3263 | ||
59641015 ID |
3264 | if (!(bctl->flags & BTRFS_BALANCE_RESUME)) { |
3265 | BUG_ON(ret == -EEXIST); | |
3266 | set_balance_control(bctl); | |
3267 | } else { | |
3268 | BUG_ON(ret != -EEXIST); | |
3269 | spin_lock(&fs_info->balance_lock); | |
3270 | update_balance_args(bctl); | |
3271 | spin_unlock(&fs_info->balance_lock); | |
3272 | } | |
c9e9f97b | 3273 | |
837d5b6e | 3274 | atomic_inc(&fs_info->balance_running); |
c9e9f97b ID |
3275 | mutex_unlock(&fs_info->balance_mutex); |
3276 | ||
3277 | ret = __btrfs_balance(fs_info); | |
3278 | ||
3279 | mutex_lock(&fs_info->balance_mutex); | |
837d5b6e | 3280 | atomic_dec(&fs_info->balance_running); |
c9e9f97b | 3281 | |
bf023ecf ID |
3282 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
3283 | fs_info->num_tolerated_disk_barrier_failures = | |
3284 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); | |
3285 | } | |
3286 | ||
c9e9f97b ID |
3287 | if (bargs) { |
3288 | memset(bargs, 0, sizeof(*bargs)); | |
19a39dce | 3289 | update_ioctl_balance_args(fs_info, 0, bargs); |
c9e9f97b ID |
3290 | } |
3291 | ||
3a01aa7a ID |
3292 | if ((ret && ret != -ECANCELED && ret != -ENOSPC) || |
3293 | balance_need_close(fs_info)) { | |
3294 | __cancel_balance(fs_info); | |
3295 | } | |
3296 | ||
837d5b6e | 3297 | wake_up(&fs_info->balance_wait_q); |
c9e9f97b ID |
3298 | |
3299 | return ret; | |
3300 | out: | |
59641015 ID |
3301 | if (bctl->flags & BTRFS_BALANCE_RESUME) |
3302 | __cancel_balance(fs_info); | |
ed0fb78f | 3303 | else { |
59641015 | 3304 | kfree(bctl); |
ed0fb78f ID |
3305 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); |
3306 | } | |
59641015 ID |
3307 | return ret; |
3308 | } | |
3309 | ||
3310 | static int balance_kthread(void *data) | |
3311 | { | |
2b6ba629 | 3312 | struct btrfs_fs_info *fs_info = data; |
9555c6c1 | 3313 | int ret = 0; |
59641015 ID |
3314 | |
3315 | mutex_lock(&fs_info->volume_mutex); | |
3316 | mutex_lock(&fs_info->balance_mutex); | |
3317 | ||
2b6ba629 | 3318 | if (fs_info->balance_ctl) { |
efe120a0 | 3319 | btrfs_info(fs_info, "continuing balance"); |
2b6ba629 | 3320 | ret = btrfs_balance(fs_info->balance_ctl, NULL); |
9555c6c1 | 3321 | } |
59641015 ID |
3322 | |
3323 | mutex_unlock(&fs_info->balance_mutex); | |
3324 | mutex_unlock(&fs_info->volume_mutex); | |
2b6ba629 | 3325 | |
59641015 ID |
3326 | return ret; |
3327 | } | |
3328 | ||
2b6ba629 ID |
3329 | int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info) |
3330 | { | |
3331 | struct task_struct *tsk; | |
3332 | ||
3333 | spin_lock(&fs_info->balance_lock); | |
3334 | if (!fs_info->balance_ctl) { | |
3335 | spin_unlock(&fs_info->balance_lock); | |
3336 | return 0; | |
3337 | } | |
3338 | spin_unlock(&fs_info->balance_lock); | |
3339 | ||
3340 | if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) { | |
efe120a0 | 3341 | btrfs_info(fs_info, "force skipping balance"); |
2b6ba629 ID |
3342 | return 0; |
3343 | } | |
3344 | ||
3345 | tsk = kthread_run(balance_kthread, fs_info, "btrfs-balance"); | |
cd633972 | 3346 | return PTR_ERR_OR_ZERO(tsk); |
2b6ba629 ID |
3347 | } |
3348 | ||
68310a5e | 3349 | int btrfs_recover_balance(struct btrfs_fs_info *fs_info) |
59641015 | 3350 | { |
59641015 ID |
3351 | struct btrfs_balance_control *bctl; |
3352 | struct btrfs_balance_item *item; | |
3353 | struct btrfs_disk_balance_args disk_bargs; | |
3354 | struct btrfs_path *path; | |
3355 | struct extent_buffer *leaf; | |
3356 | struct btrfs_key key; | |
3357 | int ret; | |
3358 | ||
3359 | path = btrfs_alloc_path(); | |
3360 | if (!path) | |
3361 | return -ENOMEM; | |
3362 | ||
59641015 ID |
3363 | key.objectid = BTRFS_BALANCE_OBJECTID; |
3364 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
3365 | key.offset = 0; | |
3366 | ||
68310a5e | 3367 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
59641015 | 3368 | if (ret < 0) |
68310a5e | 3369 | goto out; |
59641015 ID |
3370 | if (ret > 0) { /* ret = -ENOENT; */ |
3371 | ret = 0; | |
68310a5e ID |
3372 | goto out; |
3373 | } | |
3374 | ||
3375 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); | |
3376 | if (!bctl) { | |
3377 | ret = -ENOMEM; | |
3378 | goto out; | |
59641015 ID |
3379 | } |
3380 | ||
3381 | leaf = path->nodes[0]; | |
3382 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
3383 | ||
68310a5e ID |
3384 | bctl->fs_info = fs_info; |
3385 | bctl->flags = btrfs_balance_flags(leaf, item); | |
3386 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
59641015 ID |
3387 | |
3388 | btrfs_balance_data(leaf, item, &disk_bargs); | |
3389 | btrfs_disk_balance_args_to_cpu(&bctl->data, &disk_bargs); | |
3390 | btrfs_balance_meta(leaf, item, &disk_bargs); | |
3391 | btrfs_disk_balance_args_to_cpu(&bctl->meta, &disk_bargs); | |
3392 | btrfs_balance_sys(leaf, item, &disk_bargs); | |
3393 | btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs); | |
3394 | ||
ed0fb78f ID |
3395 | WARN_ON(atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)); |
3396 | ||
68310a5e ID |
3397 | mutex_lock(&fs_info->volume_mutex); |
3398 | mutex_lock(&fs_info->balance_mutex); | |
59641015 | 3399 | |
68310a5e ID |
3400 | set_balance_control(bctl); |
3401 | ||
3402 | mutex_unlock(&fs_info->balance_mutex); | |
3403 | mutex_unlock(&fs_info->volume_mutex); | |
59641015 ID |
3404 | out: |
3405 | btrfs_free_path(path); | |
ec44a35c CM |
3406 | return ret; |
3407 | } | |
3408 | ||
837d5b6e ID |
3409 | int btrfs_pause_balance(struct btrfs_fs_info *fs_info) |
3410 | { | |
3411 | int ret = 0; | |
3412 | ||
3413 | mutex_lock(&fs_info->balance_mutex); | |
3414 | if (!fs_info->balance_ctl) { | |
3415 | mutex_unlock(&fs_info->balance_mutex); | |
3416 | return -ENOTCONN; | |
3417 | } | |
3418 | ||
3419 | if (atomic_read(&fs_info->balance_running)) { | |
3420 | atomic_inc(&fs_info->balance_pause_req); | |
3421 | mutex_unlock(&fs_info->balance_mutex); | |
3422 | ||
3423 | wait_event(fs_info->balance_wait_q, | |
3424 | atomic_read(&fs_info->balance_running) == 0); | |
3425 | ||
3426 | mutex_lock(&fs_info->balance_mutex); | |
3427 | /* we are good with balance_ctl ripped off from under us */ | |
3428 | BUG_ON(atomic_read(&fs_info->balance_running)); | |
3429 | atomic_dec(&fs_info->balance_pause_req); | |
3430 | } else { | |
3431 | ret = -ENOTCONN; | |
3432 | } | |
3433 | ||
3434 | mutex_unlock(&fs_info->balance_mutex); | |
3435 | return ret; | |
3436 | } | |
3437 | ||
a7e99c69 ID |
3438 | int btrfs_cancel_balance(struct btrfs_fs_info *fs_info) |
3439 | { | |
e649e587 ID |
3440 | if (fs_info->sb->s_flags & MS_RDONLY) |
3441 | return -EROFS; | |
3442 | ||
a7e99c69 ID |
3443 | mutex_lock(&fs_info->balance_mutex); |
3444 | if (!fs_info->balance_ctl) { | |
3445 | mutex_unlock(&fs_info->balance_mutex); | |
3446 | return -ENOTCONN; | |
3447 | } | |
3448 | ||
3449 | atomic_inc(&fs_info->balance_cancel_req); | |
3450 | /* | |
3451 | * if we are running just wait and return, balance item is | |
3452 | * deleted in btrfs_balance in this case | |
3453 | */ | |
3454 | if (atomic_read(&fs_info->balance_running)) { | |
3455 | mutex_unlock(&fs_info->balance_mutex); | |
3456 | wait_event(fs_info->balance_wait_q, | |
3457 | atomic_read(&fs_info->balance_running) == 0); | |
3458 | mutex_lock(&fs_info->balance_mutex); | |
3459 | } else { | |
3460 | /* __cancel_balance needs volume_mutex */ | |
3461 | mutex_unlock(&fs_info->balance_mutex); | |
3462 | mutex_lock(&fs_info->volume_mutex); | |
3463 | mutex_lock(&fs_info->balance_mutex); | |
3464 | ||
3465 | if (fs_info->balance_ctl) | |
3466 | __cancel_balance(fs_info); | |
3467 | ||
3468 | mutex_unlock(&fs_info->volume_mutex); | |
3469 | } | |
3470 | ||
3471 | BUG_ON(fs_info->balance_ctl || atomic_read(&fs_info->balance_running)); | |
3472 | atomic_dec(&fs_info->balance_cancel_req); | |
3473 | mutex_unlock(&fs_info->balance_mutex); | |
3474 | return 0; | |
3475 | } | |
3476 | ||
803b2f54 SB |
3477 | static int btrfs_uuid_scan_kthread(void *data) |
3478 | { | |
3479 | struct btrfs_fs_info *fs_info = data; | |
3480 | struct btrfs_root *root = fs_info->tree_root; | |
3481 | struct btrfs_key key; | |
3482 | struct btrfs_key max_key; | |
3483 | struct btrfs_path *path = NULL; | |
3484 | int ret = 0; | |
3485 | struct extent_buffer *eb; | |
3486 | int slot; | |
3487 | struct btrfs_root_item root_item; | |
3488 | u32 item_size; | |
f45388f3 | 3489 | struct btrfs_trans_handle *trans = NULL; |
803b2f54 SB |
3490 | |
3491 | path = btrfs_alloc_path(); | |
3492 | if (!path) { | |
3493 | ret = -ENOMEM; | |
3494 | goto out; | |
3495 | } | |
3496 | ||
3497 | key.objectid = 0; | |
3498 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3499 | key.offset = 0; | |
3500 | ||
3501 | max_key.objectid = (u64)-1; | |
3502 | max_key.type = BTRFS_ROOT_ITEM_KEY; | |
3503 | max_key.offset = (u64)-1; | |
3504 | ||
3505 | path->keep_locks = 1; | |
3506 | ||
3507 | while (1) { | |
6174d3cb | 3508 | ret = btrfs_search_forward(root, &key, path, 0); |
803b2f54 SB |
3509 | if (ret) { |
3510 | if (ret > 0) | |
3511 | ret = 0; | |
3512 | break; | |
3513 | } | |
3514 | ||
3515 | if (key.type != BTRFS_ROOT_ITEM_KEY || | |
3516 | (key.objectid < BTRFS_FIRST_FREE_OBJECTID && | |
3517 | key.objectid != BTRFS_FS_TREE_OBJECTID) || | |
3518 | key.objectid > BTRFS_LAST_FREE_OBJECTID) | |
3519 | goto skip; | |
3520 | ||
3521 | eb = path->nodes[0]; | |
3522 | slot = path->slots[0]; | |
3523 | item_size = btrfs_item_size_nr(eb, slot); | |
3524 | if (item_size < sizeof(root_item)) | |
3525 | goto skip; | |
3526 | ||
803b2f54 SB |
3527 | read_extent_buffer(eb, &root_item, |
3528 | btrfs_item_ptr_offset(eb, slot), | |
3529 | (int)sizeof(root_item)); | |
3530 | if (btrfs_root_refs(&root_item) == 0) | |
3531 | goto skip; | |
f45388f3 FDBM |
3532 | |
3533 | if (!btrfs_is_empty_uuid(root_item.uuid) || | |
3534 | !btrfs_is_empty_uuid(root_item.received_uuid)) { | |
3535 | if (trans) | |
3536 | goto update_tree; | |
3537 | ||
3538 | btrfs_release_path(path); | |
803b2f54 SB |
3539 | /* |
3540 | * 1 - subvol uuid item | |
3541 | * 1 - received_subvol uuid item | |
3542 | */ | |
3543 | trans = btrfs_start_transaction(fs_info->uuid_root, 2); | |
3544 | if (IS_ERR(trans)) { | |
3545 | ret = PTR_ERR(trans); | |
3546 | break; | |
3547 | } | |
f45388f3 FDBM |
3548 | continue; |
3549 | } else { | |
3550 | goto skip; | |
3551 | } | |
3552 | update_tree: | |
3553 | if (!btrfs_is_empty_uuid(root_item.uuid)) { | |
803b2f54 SB |
3554 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, |
3555 | root_item.uuid, | |
3556 | BTRFS_UUID_KEY_SUBVOL, | |
3557 | key.objectid); | |
3558 | if (ret < 0) { | |
efe120a0 | 3559 | btrfs_warn(fs_info, "uuid_tree_add failed %d", |
803b2f54 | 3560 | ret); |
803b2f54 SB |
3561 | break; |
3562 | } | |
3563 | } | |
3564 | ||
3565 | if (!btrfs_is_empty_uuid(root_item.received_uuid)) { | |
803b2f54 SB |
3566 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, |
3567 | root_item.received_uuid, | |
3568 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
3569 | key.objectid); | |
3570 | if (ret < 0) { | |
efe120a0 | 3571 | btrfs_warn(fs_info, "uuid_tree_add failed %d", |
803b2f54 | 3572 | ret); |
803b2f54 SB |
3573 | break; |
3574 | } | |
3575 | } | |
3576 | ||
f45388f3 | 3577 | skip: |
803b2f54 SB |
3578 | if (trans) { |
3579 | ret = btrfs_end_transaction(trans, fs_info->uuid_root); | |
f45388f3 | 3580 | trans = NULL; |
803b2f54 SB |
3581 | if (ret) |
3582 | break; | |
3583 | } | |
3584 | ||
803b2f54 SB |
3585 | btrfs_release_path(path); |
3586 | if (key.offset < (u64)-1) { | |
3587 | key.offset++; | |
3588 | } else if (key.type < BTRFS_ROOT_ITEM_KEY) { | |
3589 | key.offset = 0; | |
3590 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3591 | } else if (key.objectid < (u64)-1) { | |
3592 | key.offset = 0; | |
3593 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3594 | key.objectid++; | |
3595 | } else { | |
3596 | break; | |
3597 | } | |
3598 | cond_resched(); | |
3599 | } | |
3600 | ||
3601 | out: | |
3602 | btrfs_free_path(path); | |
f45388f3 FDBM |
3603 | if (trans && !IS_ERR(trans)) |
3604 | btrfs_end_transaction(trans, fs_info->uuid_root); | |
803b2f54 | 3605 | if (ret) |
efe120a0 | 3606 | btrfs_warn(fs_info, "btrfs_uuid_scan_kthread failed %d", ret); |
70f80175 SB |
3607 | else |
3608 | fs_info->update_uuid_tree_gen = 1; | |
803b2f54 SB |
3609 | up(&fs_info->uuid_tree_rescan_sem); |
3610 | return 0; | |
3611 | } | |
3612 | ||
70f80175 SB |
3613 | /* |
3614 | * Callback for btrfs_uuid_tree_iterate(). | |
3615 | * returns: | |
3616 | * 0 check succeeded, the entry is not outdated. | |
3617 | * < 0 if an error occured. | |
3618 | * > 0 if the check failed, which means the caller shall remove the entry. | |
3619 | */ | |
3620 | static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info, | |
3621 | u8 *uuid, u8 type, u64 subid) | |
3622 | { | |
3623 | struct btrfs_key key; | |
3624 | int ret = 0; | |
3625 | struct btrfs_root *subvol_root; | |
3626 | ||
3627 | if (type != BTRFS_UUID_KEY_SUBVOL && | |
3628 | type != BTRFS_UUID_KEY_RECEIVED_SUBVOL) | |
3629 | goto out; | |
3630 | ||
3631 | key.objectid = subid; | |
3632 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3633 | key.offset = (u64)-1; | |
3634 | subvol_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
3635 | if (IS_ERR(subvol_root)) { | |
3636 | ret = PTR_ERR(subvol_root); | |
3637 | if (ret == -ENOENT) | |
3638 | ret = 1; | |
3639 | goto out; | |
3640 | } | |
3641 | ||
3642 | switch (type) { | |
3643 | case BTRFS_UUID_KEY_SUBVOL: | |
3644 | if (memcmp(uuid, subvol_root->root_item.uuid, BTRFS_UUID_SIZE)) | |
3645 | ret = 1; | |
3646 | break; | |
3647 | case BTRFS_UUID_KEY_RECEIVED_SUBVOL: | |
3648 | if (memcmp(uuid, subvol_root->root_item.received_uuid, | |
3649 | BTRFS_UUID_SIZE)) | |
3650 | ret = 1; | |
3651 | break; | |
3652 | } | |
3653 | ||
3654 | out: | |
3655 | return ret; | |
3656 | } | |
3657 | ||
3658 | static int btrfs_uuid_rescan_kthread(void *data) | |
3659 | { | |
3660 | struct btrfs_fs_info *fs_info = (struct btrfs_fs_info *)data; | |
3661 | int ret; | |
3662 | ||
3663 | /* | |
3664 | * 1st step is to iterate through the existing UUID tree and | |
3665 | * to delete all entries that contain outdated data. | |
3666 | * 2nd step is to add all missing entries to the UUID tree. | |
3667 | */ | |
3668 | ret = btrfs_uuid_tree_iterate(fs_info, btrfs_check_uuid_tree_entry); | |
3669 | if (ret < 0) { | |
efe120a0 | 3670 | btrfs_warn(fs_info, "iterating uuid_tree failed %d", ret); |
70f80175 SB |
3671 | up(&fs_info->uuid_tree_rescan_sem); |
3672 | return ret; | |
3673 | } | |
3674 | return btrfs_uuid_scan_kthread(data); | |
3675 | } | |
3676 | ||
f7a81ea4 SB |
3677 | int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info) |
3678 | { | |
3679 | struct btrfs_trans_handle *trans; | |
3680 | struct btrfs_root *tree_root = fs_info->tree_root; | |
3681 | struct btrfs_root *uuid_root; | |
803b2f54 SB |
3682 | struct task_struct *task; |
3683 | int ret; | |
f7a81ea4 SB |
3684 | |
3685 | /* | |
3686 | * 1 - root node | |
3687 | * 1 - root item | |
3688 | */ | |
3689 | trans = btrfs_start_transaction(tree_root, 2); | |
3690 | if (IS_ERR(trans)) | |
3691 | return PTR_ERR(trans); | |
3692 | ||
3693 | uuid_root = btrfs_create_tree(trans, fs_info, | |
3694 | BTRFS_UUID_TREE_OBJECTID); | |
3695 | if (IS_ERR(uuid_root)) { | |
3696 | btrfs_abort_transaction(trans, tree_root, | |
3697 | PTR_ERR(uuid_root)); | |
3698 | return PTR_ERR(uuid_root); | |
3699 | } | |
3700 | ||
3701 | fs_info->uuid_root = uuid_root; | |
3702 | ||
803b2f54 SB |
3703 | ret = btrfs_commit_transaction(trans, tree_root); |
3704 | if (ret) | |
3705 | return ret; | |
3706 | ||
3707 | down(&fs_info->uuid_tree_rescan_sem); | |
3708 | task = kthread_run(btrfs_uuid_scan_kthread, fs_info, "btrfs-uuid"); | |
3709 | if (IS_ERR(task)) { | |
70f80175 | 3710 | /* fs_info->update_uuid_tree_gen remains 0 in all error case */ |
efe120a0 | 3711 | btrfs_warn(fs_info, "failed to start uuid_scan task"); |
803b2f54 SB |
3712 | up(&fs_info->uuid_tree_rescan_sem); |
3713 | return PTR_ERR(task); | |
3714 | } | |
3715 | ||
3716 | return 0; | |
f7a81ea4 | 3717 | } |
803b2f54 | 3718 | |
70f80175 SB |
3719 | int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info) |
3720 | { | |
3721 | struct task_struct *task; | |
3722 | ||
3723 | down(&fs_info->uuid_tree_rescan_sem); | |
3724 | task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid"); | |
3725 | if (IS_ERR(task)) { | |
3726 | /* fs_info->update_uuid_tree_gen remains 0 in all error case */ | |
efe120a0 | 3727 | btrfs_warn(fs_info, "failed to start uuid_rescan task"); |
70f80175 SB |
3728 | up(&fs_info->uuid_tree_rescan_sem); |
3729 | return PTR_ERR(task); | |
3730 | } | |
3731 | ||
3732 | return 0; | |
3733 | } | |
3734 | ||
8f18cf13 CM |
3735 | /* |
3736 | * shrinking a device means finding all of the device extents past | |
3737 | * the new size, and then following the back refs to the chunks. | |
3738 | * The chunk relocation code actually frees the device extent | |
3739 | */ | |
3740 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
3741 | { | |
3742 | struct btrfs_trans_handle *trans; | |
3743 | struct btrfs_root *root = device->dev_root; | |
3744 | struct btrfs_dev_extent *dev_extent = NULL; | |
3745 | struct btrfs_path *path; | |
3746 | u64 length; | |
3747 | u64 chunk_tree; | |
3748 | u64 chunk_objectid; | |
3749 | u64 chunk_offset; | |
3750 | int ret; | |
3751 | int slot; | |
ba1bf481 JB |
3752 | int failed = 0; |
3753 | bool retried = false; | |
8f18cf13 CM |
3754 | struct extent_buffer *l; |
3755 | struct btrfs_key key; | |
6c41761f | 3756 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 | 3757 | u64 old_total = btrfs_super_total_bytes(super_copy); |
ba1bf481 | 3758 | u64 old_size = device->total_bytes; |
8f18cf13 CM |
3759 | u64 diff = device->total_bytes - new_size; |
3760 | ||
63a212ab SB |
3761 | if (device->is_tgtdev_for_dev_replace) |
3762 | return -EINVAL; | |
3763 | ||
8f18cf13 CM |
3764 | path = btrfs_alloc_path(); |
3765 | if (!path) | |
3766 | return -ENOMEM; | |
3767 | ||
8f18cf13 CM |
3768 | path->reada = 2; |
3769 | ||
7d9eb12c CM |
3770 | lock_chunks(root); |
3771 | ||
8f18cf13 | 3772 | device->total_bytes = new_size; |
2bf64758 | 3773 | if (device->writeable) { |
2b82032c | 3774 | device->fs_devices->total_rw_bytes -= diff; |
2bf64758 JB |
3775 | spin_lock(&root->fs_info->free_chunk_lock); |
3776 | root->fs_info->free_chunk_space -= diff; | |
3777 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3778 | } | |
7d9eb12c | 3779 | unlock_chunks(root); |
8f18cf13 | 3780 | |
ba1bf481 | 3781 | again: |
8f18cf13 CM |
3782 | key.objectid = device->devid; |
3783 | key.offset = (u64)-1; | |
3784 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3785 | ||
213e64da | 3786 | do { |
8f18cf13 CM |
3787 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
3788 | if (ret < 0) | |
3789 | goto done; | |
3790 | ||
3791 | ret = btrfs_previous_item(root, path, 0, key.type); | |
3792 | if (ret < 0) | |
3793 | goto done; | |
3794 | if (ret) { | |
3795 | ret = 0; | |
b3b4aa74 | 3796 | btrfs_release_path(path); |
bf1fb512 | 3797 | break; |
8f18cf13 CM |
3798 | } |
3799 | ||
3800 | l = path->nodes[0]; | |
3801 | slot = path->slots[0]; | |
3802 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
3803 | ||
ba1bf481 | 3804 | if (key.objectid != device->devid) { |
b3b4aa74 | 3805 | btrfs_release_path(path); |
bf1fb512 | 3806 | break; |
ba1bf481 | 3807 | } |
8f18cf13 CM |
3808 | |
3809 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
3810 | length = btrfs_dev_extent_length(l, dev_extent); | |
3811 | ||
ba1bf481 | 3812 | if (key.offset + length <= new_size) { |
b3b4aa74 | 3813 | btrfs_release_path(path); |
d6397bae | 3814 | break; |
ba1bf481 | 3815 | } |
8f18cf13 CM |
3816 | |
3817 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
3818 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
3819 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
b3b4aa74 | 3820 | btrfs_release_path(path); |
8f18cf13 CM |
3821 | |
3822 | ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid, | |
3823 | chunk_offset); | |
ba1bf481 | 3824 | if (ret && ret != -ENOSPC) |
8f18cf13 | 3825 | goto done; |
ba1bf481 JB |
3826 | if (ret == -ENOSPC) |
3827 | failed++; | |
213e64da | 3828 | } while (key.offset-- > 0); |
ba1bf481 JB |
3829 | |
3830 | if (failed && !retried) { | |
3831 | failed = 0; | |
3832 | retried = true; | |
3833 | goto again; | |
3834 | } else if (failed && retried) { | |
3835 | ret = -ENOSPC; | |
3836 | lock_chunks(root); | |
3837 | ||
3838 | device->total_bytes = old_size; | |
3839 | if (device->writeable) | |
3840 | device->fs_devices->total_rw_bytes += diff; | |
2bf64758 JB |
3841 | spin_lock(&root->fs_info->free_chunk_lock); |
3842 | root->fs_info->free_chunk_space += diff; | |
3843 | spin_unlock(&root->fs_info->free_chunk_lock); | |
ba1bf481 JB |
3844 | unlock_chunks(root); |
3845 | goto done; | |
8f18cf13 CM |
3846 | } |
3847 | ||
d6397bae | 3848 | /* Shrinking succeeded, else we would be at "done". */ |
a22285a6 | 3849 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
3850 | if (IS_ERR(trans)) { |
3851 | ret = PTR_ERR(trans); | |
3852 | goto done; | |
3853 | } | |
3854 | ||
d6397bae CB |
3855 | lock_chunks(root); |
3856 | ||
3857 | device->disk_total_bytes = new_size; | |
3858 | /* Now btrfs_update_device() will change the on-disk size. */ | |
3859 | ret = btrfs_update_device(trans, device); | |
3860 | if (ret) { | |
3861 | unlock_chunks(root); | |
3862 | btrfs_end_transaction(trans, root); | |
3863 | goto done; | |
3864 | } | |
3865 | WARN_ON(diff > old_total); | |
3866 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
3867 | unlock_chunks(root); | |
3868 | btrfs_end_transaction(trans, root); | |
8f18cf13 CM |
3869 | done: |
3870 | btrfs_free_path(path); | |
3871 | return ret; | |
3872 | } | |
3873 | ||
125ccb0a | 3874 | static int btrfs_add_system_chunk(struct btrfs_root *root, |
0b86a832 CM |
3875 | struct btrfs_key *key, |
3876 | struct btrfs_chunk *chunk, int item_size) | |
3877 | { | |
6c41761f | 3878 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
0b86a832 CM |
3879 | struct btrfs_disk_key disk_key; |
3880 | u32 array_size; | |
3881 | u8 *ptr; | |
3882 | ||
3883 | array_size = btrfs_super_sys_array_size(super_copy); | |
3884 | if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) | |
3885 | return -EFBIG; | |
3886 | ||
3887 | ptr = super_copy->sys_chunk_array + array_size; | |
3888 | btrfs_cpu_key_to_disk(&disk_key, key); | |
3889 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
3890 | ptr += sizeof(disk_key); | |
3891 | memcpy(ptr, chunk, item_size); | |
3892 | item_size += sizeof(disk_key); | |
3893 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
3894 | return 0; | |
3895 | } | |
3896 | ||
73c5de00 AJ |
3897 | /* |
3898 | * sort the devices in descending order by max_avail, total_avail | |
3899 | */ | |
3900 | static int btrfs_cmp_device_info(const void *a, const void *b) | |
9b3f68b9 | 3901 | { |
73c5de00 AJ |
3902 | const struct btrfs_device_info *di_a = a; |
3903 | const struct btrfs_device_info *di_b = b; | |
9b3f68b9 | 3904 | |
73c5de00 | 3905 | if (di_a->max_avail > di_b->max_avail) |
b2117a39 | 3906 | return -1; |
73c5de00 | 3907 | if (di_a->max_avail < di_b->max_avail) |
b2117a39 | 3908 | return 1; |
73c5de00 AJ |
3909 | if (di_a->total_avail > di_b->total_avail) |
3910 | return -1; | |
3911 | if (di_a->total_avail < di_b->total_avail) | |
3912 | return 1; | |
3913 | return 0; | |
b2117a39 | 3914 | } |
0b86a832 | 3915 | |
48a3b636 | 3916 | static struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = { |
e6ec716f MX |
3917 | [BTRFS_RAID_RAID10] = { |
3918 | .sub_stripes = 2, | |
3919 | .dev_stripes = 1, | |
3920 | .devs_max = 0, /* 0 == as many as possible */ | |
3921 | .devs_min = 4, | |
3922 | .devs_increment = 2, | |
3923 | .ncopies = 2, | |
3924 | }, | |
3925 | [BTRFS_RAID_RAID1] = { | |
3926 | .sub_stripes = 1, | |
3927 | .dev_stripes = 1, | |
3928 | .devs_max = 2, | |
3929 | .devs_min = 2, | |
3930 | .devs_increment = 2, | |
3931 | .ncopies = 2, | |
3932 | }, | |
3933 | [BTRFS_RAID_DUP] = { | |
3934 | .sub_stripes = 1, | |
3935 | .dev_stripes = 2, | |
3936 | .devs_max = 1, | |
3937 | .devs_min = 1, | |
3938 | .devs_increment = 1, | |
3939 | .ncopies = 2, | |
3940 | }, | |
3941 | [BTRFS_RAID_RAID0] = { | |
3942 | .sub_stripes = 1, | |
3943 | .dev_stripes = 1, | |
3944 | .devs_max = 0, | |
3945 | .devs_min = 2, | |
3946 | .devs_increment = 1, | |
3947 | .ncopies = 1, | |
3948 | }, | |
3949 | [BTRFS_RAID_SINGLE] = { | |
3950 | .sub_stripes = 1, | |
3951 | .dev_stripes = 1, | |
3952 | .devs_max = 1, | |
3953 | .devs_min = 1, | |
3954 | .devs_increment = 1, | |
3955 | .ncopies = 1, | |
3956 | }, | |
e942f883 CM |
3957 | [BTRFS_RAID_RAID5] = { |
3958 | .sub_stripes = 1, | |
3959 | .dev_stripes = 1, | |
3960 | .devs_max = 0, | |
3961 | .devs_min = 2, | |
3962 | .devs_increment = 1, | |
3963 | .ncopies = 2, | |
3964 | }, | |
3965 | [BTRFS_RAID_RAID6] = { | |
3966 | .sub_stripes = 1, | |
3967 | .dev_stripes = 1, | |
3968 | .devs_max = 0, | |
3969 | .devs_min = 3, | |
3970 | .devs_increment = 1, | |
3971 | .ncopies = 3, | |
3972 | }, | |
31e50229 LB |
3973 | }; |
3974 | ||
53b381b3 DW |
3975 | static u32 find_raid56_stripe_len(u32 data_devices, u32 dev_stripe_target) |
3976 | { | |
3977 | /* TODO allow them to set a preferred stripe size */ | |
3978 | return 64 * 1024; | |
3979 | } | |
3980 | ||
3981 | static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type) | |
3982 | { | |
53b381b3 DW |
3983 | if (!(type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6))) |
3984 | return; | |
3985 | ||
ceda0864 | 3986 | btrfs_set_fs_incompat(info, RAID56); |
53b381b3 DW |
3987 | } |
3988 | ||
73c5de00 | 3989 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
6df9a95e JB |
3990 | struct btrfs_root *extent_root, u64 start, |
3991 | u64 type) | |
b2117a39 | 3992 | { |
73c5de00 AJ |
3993 | struct btrfs_fs_info *info = extent_root->fs_info; |
3994 | struct btrfs_fs_devices *fs_devices = info->fs_devices; | |
3995 | struct list_head *cur; | |
3996 | struct map_lookup *map = NULL; | |
3997 | struct extent_map_tree *em_tree; | |
3998 | struct extent_map *em; | |
3999 | struct btrfs_device_info *devices_info = NULL; | |
4000 | u64 total_avail; | |
4001 | int num_stripes; /* total number of stripes to allocate */ | |
53b381b3 DW |
4002 | int data_stripes; /* number of stripes that count for |
4003 | block group size */ | |
73c5de00 AJ |
4004 | int sub_stripes; /* sub_stripes info for map */ |
4005 | int dev_stripes; /* stripes per dev */ | |
4006 | int devs_max; /* max devs to use */ | |
4007 | int devs_min; /* min devs needed */ | |
4008 | int devs_increment; /* ndevs has to be a multiple of this */ | |
4009 | int ncopies; /* how many copies to data has */ | |
4010 | int ret; | |
4011 | u64 max_stripe_size; | |
4012 | u64 max_chunk_size; | |
4013 | u64 stripe_size; | |
4014 | u64 num_bytes; | |
53b381b3 | 4015 | u64 raid_stripe_len = BTRFS_STRIPE_LEN; |
73c5de00 AJ |
4016 | int ndevs; |
4017 | int i; | |
4018 | int j; | |
31e50229 | 4019 | int index; |
593060d7 | 4020 | |
0c460c0d | 4021 | BUG_ON(!alloc_profile_is_valid(type, 0)); |
9b3f68b9 | 4022 | |
73c5de00 AJ |
4023 | if (list_empty(&fs_devices->alloc_list)) |
4024 | return -ENOSPC; | |
b2117a39 | 4025 | |
31e50229 | 4026 | index = __get_raid_index(type); |
73c5de00 | 4027 | |
31e50229 LB |
4028 | sub_stripes = btrfs_raid_array[index].sub_stripes; |
4029 | dev_stripes = btrfs_raid_array[index].dev_stripes; | |
4030 | devs_max = btrfs_raid_array[index].devs_max; | |
4031 | devs_min = btrfs_raid_array[index].devs_min; | |
4032 | devs_increment = btrfs_raid_array[index].devs_increment; | |
4033 | ncopies = btrfs_raid_array[index].ncopies; | |
b2117a39 | 4034 | |
9b3f68b9 | 4035 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
73c5de00 AJ |
4036 | max_stripe_size = 1024 * 1024 * 1024; |
4037 | max_chunk_size = 10 * max_stripe_size; | |
9b3f68b9 | 4038 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
1100373f CM |
4039 | /* for larger filesystems, use larger metadata chunks */ |
4040 | if (fs_devices->total_rw_bytes > 50ULL * 1024 * 1024 * 1024) | |
4041 | max_stripe_size = 1024 * 1024 * 1024; | |
4042 | else | |
4043 | max_stripe_size = 256 * 1024 * 1024; | |
73c5de00 | 4044 | max_chunk_size = max_stripe_size; |
a40a90a0 | 4045 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
96bdc7dc | 4046 | max_stripe_size = 32 * 1024 * 1024; |
73c5de00 AJ |
4047 | max_chunk_size = 2 * max_stripe_size; |
4048 | } else { | |
efe120a0 | 4049 | btrfs_err(info, "invalid chunk type 0x%llx requested\n", |
73c5de00 AJ |
4050 | type); |
4051 | BUG_ON(1); | |
9b3f68b9 CM |
4052 | } |
4053 | ||
2b82032c YZ |
4054 | /* we don't want a chunk larger than 10% of writeable space */ |
4055 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
4056 | max_chunk_size); | |
9b3f68b9 | 4057 | |
73c5de00 AJ |
4058 | devices_info = kzalloc(sizeof(*devices_info) * fs_devices->rw_devices, |
4059 | GFP_NOFS); | |
4060 | if (!devices_info) | |
4061 | return -ENOMEM; | |
0cad8a11 | 4062 | |
73c5de00 | 4063 | cur = fs_devices->alloc_list.next; |
9b3f68b9 | 4064 | |
9f680ce0 | 4065 | /* |
73c5de00 AJ |
4066 | * in the first pass through the devices list, we gather information |
4067 | * about the available holes on each device. | |
9f680ce0 | 4068 | */ |
73c5de00 AJ |
4069 | ndevs = 0; |
4070 | while (cur != &fs_devices->alloc_list) { | |
4071 | struct btrfs_device *device; | |
4072 | u64 max_avail; | |
4073 | u64 dev_offset; | |
b2117a39 | 4074 | |
73c5de00 | 4075 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
9f680ce0 | 4076 | |
73c5de00 | 4077 | cur = cur->next; |
b2117a39 | 4078 | |
73c5de00 | 4079 | if (!device->writeable) { |
31b1a2bd | 4080 | WARN(1, KERN_ERR |
efe120a0 | 4081 | "BTRFS: read-only device in alloc_list\n"); |
73c5de00 AJ |
4082 | continue; |
4083 | } | |
b2117a39 | 4084 | |
63a212ab SB |
4085 | if (!device->in_fs_metadata || |
4086 | device->is_tgtdev_for_dev_replace) | |
73c5de00 | 4087 | continue; |
b2117a39 | 4088 | |
73c5de00 AJ |
4089 | if (device->total_bytes > device->bytes_used) |
4090 | total_avail = device->total_bytes - device->bytes_used; | |
4091 | else | |
4092 | total_avail = 0; | |
38c01b96 | 4093 | |
4094 | /* If there is no space on this device, skip it. */ | |
4095 | if (total_avail == 0) | |
4096 | continue; | |
b2117a39 | 4097 | |
6df9a95e | 4098 | ret = find_free_dev_extent(trans, device, |
73c5de00 AJ |
4099 | max_stripe_size * dev_stripes, |
4100 | &dev_offset, &max_avail); | |
4101 | if (ret && ret != -ENOSPC) | |
4102 | goto error; | |
b2117a39 | 4103 | |
73c5de00 AJ |
4104 | if (ret == 0) |
4105 | max_avail = max_stripe_size * dev_stripes; | |
b2117a39 | 4106 | |
73c5de00 AJ |
4107 | if (max_avail < BTRFS_STRIPE_LEN * dev_stripes) |
4108 | continue; | |
b2117a39 | 4109 | |
063d006f ES |
4110 | if (ndevs == fs_devices->rw_devices) { |
4111 | WARN(1, "%s: found more than %llu devices\n", | |
4112 | __func__, fs_devices->rw_devices); | |
4113 | break; | |
4114 | } | |
73c5de00 AJ |
4115 | devices_info[ndevs].dev_offset = dev_offset; |
4116 | devices_info[ndevs].max_avail = max_avail; | |
4117 | devices_info[ndevs].total_avail = total_avail; | |
4118 | devices_info[ndevs].dev = device; | |
4119 | ++ndevs; | |
4120 | } | |
b2117a39 | 4121 | |
73c5de00 AJ |
4122 | /* |
4123 | * now sort the devices by hole size / available space | |
4124 | */ | |
4125 | sort(devices_info, ndevs, sizeof(struct btrfs_device_info), | |
4126 | btrfs_cmp_device_info, NULL); | |
b2117a39 | 4127 | |
73c5de00 AJ |
4128 | /* round down to number of usable stripes */ |
4129 | ndevs -= ndevs % devs_increment; | |
b2117a39 | 4130 | |
73c5de00 AJ |
4131 | if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) { |
4132 | ret = -ENOSPC; | |
4133 | goto error; | |
b2117a39 | 4134 | } |
9f680ce0 | 4135 | |
73c5de00 AJ |
4136 | if (devs_max && ndevs > devs_max) |
4137 | ndevs = devs_max; | |
4138 | /* | |
4139 | * the primary goal is to maximize the number of stripes, so use as many | |
4140 | * devices as possible, even if the stripes are not maximum sized. | |
4141 | */ | |
4142 | stripe_size = devices_info[ndevs-1].max_avail; | |
4143 | num_stripes = ndevs * dev_stripes; | |
b2117a39 | 4144 | |
53b381b3 DW |
4145 | /* |
4146 | * this will have to be fixed for RAID1 and RAID10 over | |
4147 | * more drives | |
4148 | */ | |
4149 | data_stripes = num_stripes / ncopies; | |
4150 | ||
53b381b3 DW |
4151 | if (type & BTRFS_BLOCK_GROUP_RAID5) { |
4152 | raid_stripe_len = find_raid56_stripe_len(ndevs - 1, | |
4153 | btrfs_super_stripesize(info->super_copy)); | |
4154 | data_stripes = num_stripes - 1; | |
4155 | } | |
4156 | if (type & BTRFS_BLOCK_GROUP_RAID6) { | |
4157 | raid_stripe_len = find_raid56_stripe_len(ndevs - 2, | |
4158 | btrfs_super_stripesize(info->super_copy)); | |
4159 | data_stripes = num_stripes - 2; | |
4160 | } | |
86db2578 CM |
4161 | |
4162 | /* | |
4163 | * Use the number of data stripes to figure out how big this chunk | |
4164 | * is really going to be in terms of logical address space, | |
4165 | * and compare that answer with the max chunk size | |
4166 | */ | |
4167 | if (stripe_size * data_stripes > max_chunk_size) { | |
4168 | u64 mask = (1ULL << 24) - 1; | |
4169 | stripe_size = max_chunk_size; | |
4170 | do_div(stripe_size, data_stripes); | |
4171 | ||
4172 | /* bump the answer up to a 16MB boundary */ | |
4173 | stripe_size = (stripe_size + mask) & ~mask; | |
4174 | ||
4175 | /* but don't go higher than the limits we found | |
4176 | * while searching for free extents | |
4177 | */ | |
4178 | if (stripe_size > devices_info[ndevs-1].max_avail) | |
4179 | stripe_size = devices_info[ndevs-1].max_avail; | |
4180 | } | |
4181 | ||
73c5de00 | 4182 | do_div(stripe_size, dev_stripes); |
37db63a4 ID |
4183 | |
4184 | /* align to BTRFS_STRIPE_LEN */ | |
53b381b3 DW |
4185 | do_div(stripe_size, raid_stripe_len); |
4186 | stripe_size *= raid_stripe_len; | |
b2117a39 MX |
4187 | |
4188 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
4189 | if (!map) { | |
4190 | ret = -ENOMEM; | |
4191 | goto error; | |
4192 | } | |
4193 | map->num_stripes = num_stripes; | |
9b3f68b9 | 4194 | |
73c5de00 AJ |
4195 | for (i = 0; i < ndevs; ++i) { |
4196 | for (j = 0; j < dev_stripes; ++j) { | |
4197 | int s = i * dev_stripes + j; | |
4198 | map->stripes[s].dev = devices_info[i].dev; | |
4199 | map->stripes[s].physical = devices_info[i].dev_offset + | |
4200 | j * stripe_size; | |
6324fbf3 | 4201 | } |
6324fbf3 | 4202 | } |
2b82032c | 4203 | map->sector_size = extent_root->sectorsize; |
53b381b3 DW |
4204 | map->stripe_len = raid_stripe_len; |
4205 | map->io_align = raid_stripe_len; | |
4206 | map->io_width = raid_stripe_len; | |
2b82032c | 4207 | map->type = type; |
2b82032c | 4208 | map->sub_stripes = sub_stripes; |
0b86a832 | 4209 | |
53b381b3 | 4210 | num_bytes = stripe_size * data_stripes; |
0b86a832 | 4211 | |
73c5de00 | 4212 | trace_btrfs_chunk_alloc(info->chunk_root, map, start, num_bytes); |
1abe9b8a | 4213 | |
172ddd60 | 4214 | em = alloc_extent_map(); |
2b82032c | 4215 | if (!em) { |
b2117a39 MX |
4216 | ret = -ENOMEM; |
4217 | goto error; | |
593060d7 | 4218 | } |
2b82032c YZ |
4219 | em->bdev = (struct block_device *)map; |
4220 | em->start = start; | |
73c5de00 | 4221 | em->len = num_bytes; |
2b82032c YZ |
4222 | em->block_start = 0; |
4223 | em->block_len = em->len; | |
6df9a95e | 4224 | em->orig_block_len = stripe_size; |
593060d7 | 4225 | |
2b82032c | 4226 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
890871be | 4227 | write_lock(&em_tree->lock); |
09a2a8f9 | 4228 | ret = add_extent_mapping(em_tree, em, 0); |
6df9a95e JB |
4229 | if (!ret) { |
4230 | list_add_tail(&em->list, &trans->transaction->pending_chunks); | |
4231 | atomic_inc(&em->refs); | |
4232 | } | |
890871be | 4233 | write_unlock(&em_tree->lock); |
0f5d42b2 JB |
4234 | if (ret) { |
4235 | free_extent_map(em); | |
1dd4602f | 4236 | goto error; |
0f5d42b2 | 4237 | } |
0b86a832 | 4238 | |
04487488 JB |
4239 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
4240 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
4241 | start, num_bytes); | |
6df9a95e JB |
4242 | if (ret) |
4243 | goto error_del_extent; | |
2b82032c | 4244 | |
0f5d42b2 | 4245 | free_extent_map(em); |
53b381b3 DW |
4246 | check_raid56_incompat_flag(extent_root->fs_info, type); |
4247 | ||
b2117a39 | 4248 | kfree(devices_info); |
2b82032c | 4249 | return 0; |
b2117a39 | 4250 | |
6df9a95e | 4251 | error_del_extent: |
0f5d42b2 JB |
4252 | write_lock(&em_tree->lock); |
4253 | remove_extent_mapping(em_tree, em); | |
4254 | write_unlock(&em_tree->lock); | |
4255 | ||
4256 | /* One for our allocation */ | |
4257 | free_extent_map(em); | |
4258 | /* One for the tree reference */ | |
4259 | free_extent_map(em); | |
b2117a39 MX |
4260 | error: |
4261 | kfree(map); | |
4262 | kfree(devices_info); | |
4263 | return ret; | |
2b82032c YZ |
4264 | } |
4265 | ||
6df9a95e | 4266 | int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, |
2b82032c | 4267 | struct btrfs_root *extent_root, |
6df9a95e | 4268 | u64 chunk_offset, u64 chunk_size) |
2b82032c | 4269 | { |
2b82032c YZ |
4270 | struct btrfs_key key; |
4271 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
4272 | struct btrfs_device *device; | |
4273 | struct btrfs_chunk *chunk; | |
4274 | struct btrfs_stripe *stripe; | |
6df9a95e JB |
4275 | struct extent_map_tree *em_tree; |
4276 | struct extent_map *em; | |
4277 | struct map_lookup *map; | |
4278 | size_t item_size; | |
4279 | u64 dev_offset; | |
4280 | u64 stripe_size; | |
4281 | int i = 0; | |
2b82032c YZ |
4282 | int ret; |
4283 | ||
6df9a95e JB |
4284 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
4285 | read_lock(&em_tree->lock); | |
4286 | em = lookup_extent_mapping(em_tree, chunk_offset, chunk_size); | |
4287 | read_unlock(&em_tree->lock); | |
4288 | ||
4289 | if (!em) { | |
4290 | btrfs_crit(extent_root->fs_info, "unable to find logical " | |
4291 | "%Lu len %Lu", chunk_offset, chunk_size); | |
4292 | return -EINVAL; | |
4293 | } | |
4294 | ||
4295 | if (em->start != chunk_offset || em->len != chunk_size) { | |
4296 | btrfs_crit(extent_root->fs_info, "found a bad mapping, wanted" | |
4297 | " %Lu-%Lu, found %Lu-%Lu\n", chunk_offset, | |
4298 | chunk_size, em->start, em->len); | |
4299 | free_extent_map(em); | |
4300 | return -EINVAL; | |
4301 | } | |
4302 | ||
4303 | map = (struct map_lookup *)em->bdev; | |
4304 | item_size = btrfs_chunk_item_size(map->num_stripes); | |
4305 | stripe_size = em->orig_block_len; | |
4306 | ||
2b82032c | 4307 | chunk = kzalloc(item_size, GFP_NOFS); |
6df9a95e JB |
4308 | if (!chunk) { |
4309 | ret = -ENOMEM; | |
4310 | goto out; | |
4311 | } | |
4312 | ||
4313 | for (i = 0; i < map->num_stripes; i++) { | |
4314 | device = map->stripes[i].dev; | |
4315 | dev_offset = map->stripes[i].physical; | |
2b82032c | 4316 | |
2b82032c | 4317 | device->bytes_used += stripe_size; |
0b86a832 | 4318 | ret = btrfs_update_device(trans, device); |
3acd3953 | 4319 | if (ret) |
6df9a95e JB |
4320 | goto out; |
4321 | ret = btrfs_alloc_dev_extent(trans, device, | |
4322 | chunk_root->root_key.objectid, | |
4323 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
4324 | chunk_offset, dev_offset, | |
4325 | stripe_size); | |
4326 | if (ret) | |
4327 | goto out; | |
2b82032c YZ |
4328 | } |
4329 | ||
2bf64758 JB |
4330 | spin_lock(&extent_root->fs_info->free_chunk_lock); |
4331 | extent_root->fs_info->free_chunk_space -= (stripe_size * | |
4332 | map->num_stripes); | |
4333 | spin_unlock(&extent_root->fs_info->free_chunk_lock); | |
4334 | ||
2b82032c | 4335 | stripe = &chunk->stripe; |
6df9a95e JB |
4336 | for (i = 0; i < map->num_stripes; i++) { |
4337 | device = map->stripes[i].dev; | |
4338 | dev_offset = map->stripes[i].physical; | |
0b86a832 | 4339 | |
e17cade2 CM |
4340 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
4341 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
4342 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 4343 | stripe++; |
0b86a832 CM |
4344 | } |
4345 | ||
2b82032c | 4346 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 4347 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
4348 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
4349 | btrfs_set_stack_chunk_type(chunk, map->type); | |
4350 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
4351 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
4352 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b86a832 | 4353 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
2b82032c | 4354 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 4355 | |
2b82032c YZ |
4356 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
4357 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
4358 | key.offset = chunk_offset; | |
0b86a832 | 4359 | |
2b82032c | 4360 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
4ed1d16e MF |
4361 | if (ret == 0 && map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
4362 | /* | |
4363 | * TODO: Cleanup of inserted chunk root in case of | |
4364 | * failure. | |
4365 | */ | |
125ccb0a | 4366 | ret = btrfs_add_system_chunk(chunk_root, &key, chunk, |
2b82032c | 4367 | item_size); |
8f18cf13 | 4368 | } |
1abe9b8a | 4369 | |
6df9a95e | 4370 | out: |
0b86a832 | 4371 | kfree(chunk); |
6df9a95e | 4372 | free_extent_map(em); |
4ed1d16e | 4373 | return ret; |
2b82032c | 4374 | } |
0b86a832 | 4375 | |
2b82032c YZ |
4376 | /* |
4377 | * Chunk allocation falls into two parts. The first part does works | |
4378 | * that make the new allocated chunk useable, but not do any operation | |
4379 | * that modifies the chunk tree. The second part does the works that | |
4380 | * require modifying the chunk tree. This division is important for the | |
4381 | * bootstrap process of adding storage to a seed btrfs. | |
4382 | */ | |
4383 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
4384 | struct btrfs_root *extent_root, u64 type) | |
4385 | { | |
4386 | u64 chunk_offset; | |
2b82032c | 4387 | |
6df9a95e JB |
4388 | chunk_offset = find_next_chunk(extent_root->fs_info); |
4389 | return __btrfs_alloc_chunk(trans, extent_root, chunk_offset, type); | |
2b82032c YZ |
4390 | } |
4391 | ||
d397712b | 4392 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
2b82032c YZ |
4393 | struct btrfs_root *root, |
4394 | struct btrfs_device *device) | |
4395 | { | |
4396 | u64 chunk_offset; | |
4397 | u64 sys_chunk_offset; | |
2b82032c | 4398 | u64 alloc_profile; |
2b82032c YZ |
4399 | struct btrfs_fs_info *fs_info = root->fs_info; |
4400 | struct btrfs_root *extent_root = fs_info->extent_root; | |
4401 | int ret; | |
4402 | ||
6df9a95e | 4403 | chunk_offset = find_next_chunk(fs_info); |
de98ced9 | 4404 | alloc_profile = btrfs_get_alloc_profile(extent_root, 0); |
6df9a95e JB |
4405 | ret = __btrfs_alloc_chunk(trans, extent_root, chunk_offset, |
4406 | alloc_profile); | |
79787eaa JM |
4407 | if (ret) |
4408 | return ret; | |
2b82032c | 4409 | |
6df9a95e | 4410 | sys_chunk_offset = find_next_chunk(root->fs_info); |
de98ced9 | 4411 | alloc_profile = btrfs_get_alloc_profile(fs_info->chunk_root, 0); |
6df9a95e JB |
4412 | ret = __btrfs_alloc_chunk(trans, extent_root, sys_chunk_offset, |
4413 | alloc_profile); | |
005d6427 DS |
4414 | if (ret) { |
4415 | btrfs_abort_transaction(trans, root, ret); | |
4416 | goto out; | |
4417 | } | |
2b82032c YZ |
4418 | |
4419 | ret = btrfs_add_device(trans, fs_info->chunk_root, device); | |
79787eaa | 4420 | if (ret) |
005d6427 | 4421 | btrfs_abort_transaction(trans, root, ret); |
005d6427 | 4422 | out: |
79787eaa | 4423 | return ret; |
2b82032c YZ |
4424 | } |
4425 | ||
4426 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) | |
4427 | { | |
4428 | struct extent_map *em; | |
4429 | struct map_lookup *map; | |
4430 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
4431 | int readonly = 0; | |
4432 | int i; | |
4433 | ||
890871be | 4434 | read_lock(&map_tree->map_tree.lock); |
2b82032c | 4435 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
890871be | 4436 | read_unlock(&map_tree->map_tree.lock); |
2b82032c YZ |
4437 | if (!em) |
4438 | return 1; | |
4439 | ||
f48b9075 JB |
4440 | if (btrfs_test_opt(root, DEGRADED)) { |
4441 | free_extent_map(em); | |
4442 | return 0; | |
4443 | } | |
4444 | ||
2b82032c YZ |
4445 | map = (struct map_lookup *)em->bdev; |
4446 | for (i = 0; i < map->num_stripes; i++) { | |
4447 | if (!map->stripes[i].dev->writeable) { | |
4448 | readonly = 1; | |
4449 | break; | |
4450 | } | |
4451 | } | |
0b86a832 | 4452 | free_extent_map(em); |
2b82032c | 4453 | return readonly; |
0b86a832 CM |
4454 | } |
4455 | ||
4456 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
4457 | { | |
a8067e02 | 4458 | extent_map_tree_init(&tree->map_tree); |
0b86a832 CM |
4459 | } |
4460 | ||
4461 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
4462 | { | |
4463 | struct extent_map *em; | |
4464 | ||
d397712b | 4465 | while (1) { |
890871be | 4466 | write_lock(&tree->map_tree.lock); |
0b86a832 CM |
4467 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
4468 | if (em) | |
4469 | remove_extent_mapping(&tree->map_tree, em); | |
890871be | 4470 | write_unlock(&tree->map_tree.lock); |
0b86a832 CM |
4471 | if (!em) |
4472 | break; | |
4473 | kfree(em->bdev); | |
4474 | /* once for us */ | |
4475 | free_extent_map(em); | |
4476 | /* once for the tree */ | |
4477 | free_extent_map(em); | |
4478 | } | |
4479 | } | |
4480 | ||
5d964051 | 4481 | int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len) |
f188591e | 4482 | { |
5d964051 | 4483 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
f188591e CM |
4484 | struct extent_map *em; |
4485 | struct map_lookup *map; | |
4486 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
4487 | int ret; | |
4488 | ||
890871be | 4489 | read_lock(&em_tree->lock); |
f188591e | 4490 | em = lookup_extent_mapping(em_tree, logical, len); |
890871be | 4491 | read_unlock(&em_tree->lock); |
f188591e | 4492 | |
fb7669b5 JB |
4493 | /* |
4494 | * We could return errors for these cases, but that could get ugly and | |
4495 | * we'd probably do the same thing which is just not do anything else | |
4496 | * and exit, so return 1 so the callers don't try to use other copies. | |
4497 | */ | |
4498 | if (!em) { | |
ccf39f92 | 4499 | btrfs_crit(fs_info, "No mapping for %Lu-%Lu\n", logical, |
fb7669b5 JB |
4500 | logical+len); |
4501 | return 1; | |
4502 | } | |
4503 | ||
4504 | if (em->start > logical || em->start + em->len < logical) { | |
ccf39f92 | 4505 | btrfs_crit(fs_info, "Invalid mapping for %Lu-%Lu, got " |
fb7669b5 JB |
4506 | "%Lu-%Lu\n", logical, logical+len, em->start, |
4507 | em->start + em->len); | |
7d3d1744 | 4508 | free_extent_map(em); |
fb7669b5 JB |
4509 | return 1; |
4510 | } | |
4511 | ||
f188591e CM |
4512 | map = (struct map_lookup *)em->bdev; |
4513 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
4514 | ret = map->num_stripes; | |
321aecc6 CM |
4515 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
4516 | ret = map->sub_stripes; | |
53b381b3 DW |
4517 | else if (map->type & BTRFS_BLOCK_GROUP_RAID5) |
4518 | ret = 2; | |
4519 | else if (map->type & BTRFS_BLOCK_GROUP_RAID6) | |
4520 | ret = 3; | |
f188591e CM |
4521 | else |
4522 | ret = 1; | |
4523 | free_extent_map(em); | |
ad6d620e SB |
4524 | |
4525 | btrfs_dev_replace_lock(&fs_info->dev_replace); | |
4526 | if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) | |
4527 | ret++; | |
4528 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
4529 | ||
f188591e CM |
4530 | return ret; |
4531 | } | |
4532 | ||
53b381b3 DW |
4533 | unsigned long btrfs_full_stripe_len(struct btrfs_root *root, |
4534 | struct btrfs_mapping_tree *map_tree, | |
4535 | u64 logical) | |
4536 | { | |
4537 | struct extent_map *em; | |
4538 | struct map_lookup *map; | |
4539 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
4540 | unsigned long len = root->sectorsize; | |
4541 | ||
4542 | read_lock(&em_tree->lock); | |
4543 | em = lookup_extent_mapping(em_tree, logical, len); | |
4544 | read_unlock(&em_tree->lock); | |
4545 | BUG_ON(!em); | |
4546 | ||
4547 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
4548 | map = (struct map_lookup *)em->bdev; | |
4549 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | | |
4550 | BTRFS_BLOCK_GROUP_RAID6)) { | |
4551 | len = map->stripe_len * nr_data_stripes(map); | |
4552 | } | |
4553 | free_extent_map(em); | |
4554 | return len; | |
4555 | } | |
4556 | ||
4557 | int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree, | |
4558 | u64 logical, u64 len, int mirror_num) | |
4559 | { | |
4560 | struct extent_map *em; | |
4561 | struct map_lookup *map; | |
4562 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
4563 | int ret = 0; | |
4564 | ||
4565 | read_lock(&em_tree->lock); | |
4566 | em = lookup_extent_mapping(em_tree, logical, len); | |
4567 | read_unlock(&em_tree->lock); | |
4568 | BUG_ON(!em); | |
4569 | ||
4570 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
4571 | map = (struct map_lookup *)em->bdev; | |
4572 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | | |
4573 | BTRFS_BLOCK_GROUP_RAID6)) | |
4574 | ret = 1; | |
4575 | free_extent_map(em); | |
4576 | return ret; | |
4577 | } | |
4578 | ||
30d9861f SB |
4579 | static int find_live_mirror(struct btrfs_fs_info *fs_info, |
4580 | struct map_lookup *map, int first, int num, | |
4581 | int optimal, int dev_replace_is_ongoing) | |
dfe25020 CM |
4582 | { |
4583 | int i; | |
30d9861f SB |
4584 | int tolerance; |
4585 | struct btrfs_device *srcdev; | |
4586 | ||
4587 | if (dev_replace_is_ongoing && | |
4588 | fs_info->dev_replace.cont_reading_from_srcdev_mode == | |
4589 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID) | |
4590 | srcdev = fs_info->dev_replace.srcdev; | |
4591 | else | |
4592 | srcdev = NULL; | |
4593 | ||
4594 | /* | |
4595 | * try to avoid the drive that is the source drive for a | |
4596 | * dev-replace procedure, only choose it if no other non-missing | |
4597 | * mirror is available | |
4598 | */ | |
4599 | for (tolerance = 0; tolerance < 2; tolerance++) { | |
4600 | if (map->stripes[optimal].dev->bdev && | |
4601 | (tolerance || map->stripes[optimal].dev != srcdev)) | |
4602 | return optimal; | |
4603 | for (i = first; i < first + num; i++) { | |
4604 | if (map->stripes[i].dev->bdev && | |
4605 | (tolerance || map->stripes[i].dev != srcdev)) | |
4606 | return i; | |
4607 | } | |
dfe25020 | 4608 | } |
30d9861f | 4609 | |
dfe25020 CM |
4610 | /* we couldn't find one that doesn't fail. Just return something |
4611 | * and the io error handling code will clean up eventually | |
4612 | */ | |
4613 | return optimal; | |
4614 | } | |
4615 | ||
53b381b3 DW |
4616 | static inline int parity_smaller(u64 a, u64 b) |
4617 | { | |
4618 | return a > b; | |
4619 | } | |
4620 | ||
4621 | /* Bubble-sort the stripe set to put the parity/syndrome stripes last */ | |
4622 | static void sort_parity_stripes(struct btrfs_bio *bbio, u64 *raid_map) | |
4623 | { | |
4624 | struct btrfs_bio_stripe s; | |
4625 | int i; | |
4626 | u64 l; | |
4627 | int again = 1; | |
4628 | ||
4629 | while (again) { | |
4630 | again = 0; | |
4631 | for (i = 0; i < bbio->num_stripes - 1; i++) { | |
4632 | if (parity_smaller(raid_map[i], raid_map[i+1])) { | |
4633 | s = bbio->stripes[i]; | |
4634 | l = raid_map[i]; | |
4635 | bbio->stripes[i] = bbio->stripes[i+1]; | |
4636 | raid_map[i] = raid_map[i+1]; | |
4637 | bbio->stripes[i+1] = s; | |
4638 | raid_map[i+1] = l; | |
4639 | again = 1; | |
4640 | } | |
4641 | } | |
4642 | } | |
4643 | } | |
4644 | ||
3ec706c8 | 4645 | static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, |
f2d8d74d | 4646 | u64 logical, u64 *length, |
a1d3c478 | 4647 | struct btrfs_bio **bbio_ret, |
53b381b3 | 4648 | int mirror_num, u64 **raid_map_ret) |
0b86a832 CM |
4649 | { |
4650 | struct extent_map *em; | |
4651 | struct map_lookup *map; | |
3ec706c8 | 4652 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
0b86a832 CM |
4653 | struct extent_map_tree *em_tree = &map_tree->map_tree; |
4654 | u64 offset; | |
593060d7 | 4655 | u64 stripe_offset; |
fce3bb9a | 4656 | u64 stripe_end_offset; |
593060d7 | 4657 | u64 stripe_nr; |
fce3bb9a LD |
4658 | u64 stripe_nr_orig; |
4659 | u64 stripe_nr_end; | |
53b381b3 DW |
4660 | u64 stripe_len; |
4661 | u64 *raid_map = NULL; | |
593060d7 | 4662 | int stripe_index; |
cea9e445 | 4663 | int i; |
de11cc12 | 4664 | int ret = 0; |
f2d8d74d | 4665 | int num_stripes; |
a236aed1 | 4666 | int max_errors = 0; |
a1d3c478 | 4667 | struct btrfs_bio *bbio = NULL; |
472262f3 SB |
4668 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
4669 | int dev_replace_is_ongoing = 0; | |
4670 | int num_alloc_stripes; | |
ad6d620e SB |
4671 | int patch_the_first_stripe_for_dev_replace = 0; |
4672 | u64 physical_to_patch_in_first_stripe = 0; | |
53b381b3 | 4673 | u64 raid56_full_stripe_start = (u64)-1; |
0b86a832 | 4674 | |
890871be | 4675 | read_lock(&em_tree->lock); |
0b86a832 | 4676 | em = lookup_extent_mapping(em_tree, logical, *length); |
890871be | 4677 | read_unlock(&em_tree->lock); |
f2d8d74d | 4678 | |
3b951516 | 4679 | if (!em) { |
c2cf52eb | 4680 | btrfs_crit(fs_info, "unable to find logical %llu len %llu", |
c1c9ff7c | 4681 | logical, *length); |
9bb91873 JB |
4682 | return -EINVAL; |
4683 | } | |
4684 | ||
4685 | if (em->start > logical || em->start + em->len < logical) { | |
4686 | btrfs_crit(fs_info, "found a bad mapping, wanted %Lu, " | |
4687 | "found %Lu-%Lu\n", logical, em->start, | |
4688 | em->start + em->len); | |
7d3d1744 | 4689 | free_extent_map(em); |
9bb91873 | 4690 | return -EINVAL; |
3b951516 | 4691 | } |
0b86a832 | 4692 | |
0b86a832 CM |
4693 | map = (struct map_lookup *)em->bdev; |
4694 | offset = logical - em->start; | |
593060d7 | 4695 | |
53b381b3 | 4696 | stripe_len = map->stripe_len; |
593060d7 CM |
4697 | stripe_nr = offset; |
4698 | /* | |
4699 | * stripe_nr counts the total number of stripes we have to stride | |
4700 | * to get to this block | |
4701 | */ | |
53b381b3 | 4702 | do_div(stripe_nr, stripe_len); |
593060d7 | 4703 | |
53b381b3 | 4704 | stripe_offset = stripe_nr * stripe_len; |
593060d7 CM |
4705 | BUG_ON(offset < stripe_offset); |
4706 | ||
4707 | /* stripe_offset is the offset of this block in its stripe*/ | |
4708 | stripe_offset = offset - stripe_offset; | |
4709 | ||
53b381b3 DW |
4710 | /* if we're here for raid56, we need to know the stripe aligned start */ |
4711 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) { | |
4712 | unsigned long full_stripe_len = stripe_len * nr_data_stripes(map); | |
4713 | raid56_full_stripe_start = offset; | |
4714 | ||
4715 | /* allow a write of a full stripe, but make sure we don't | |
4716 | * allow straddling of stripes | |
4717 | */ | |
4718 | do_div(raid56_full_stripe_start, full_stripe_len); | |
4719 | raid56_full_stripe_start *= full_stripe_len; | |
4720 | } | |
4721 | ||
4722 | if (rw & REQ_DISCARD) { | |
4723 | /* we don't discard raid56 yet */ | |
4724 | if (map->type & | |
4725 | (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) { | |
4726 | ret = -EOPNOTSUPP; | |
4727 | goto out; | |
4728 | } | |
fce3bb9a | 4729 | *length = min_t(u64, em->len - offset, *length); |
53b381b3 DW |
4730 | } else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) { |
4731 | u64 max_len; | |
4732 | /* For writes to RAID[56], allow a full stripeset across all disks. | |
4733 | For other RAID types and for RAID[56] reads, just allow a single | |
4734 | stripe (on a single disk). */ | |
4735 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6) && | |
4736 | (rw & REQ_WRITE)) { | |
4737 | max_len = stripe_len * nr_data_stripes(map) - | |
4738 | (offset - raid56_full_stripe_start); | |
4739 | } else { | |
4740 | /* we limit the length of each bio to what fits in a stripe */ | |
4741 | max_len = stripe_len - stripe_offset; | |
4742 | } | |
4743 | *length = min_t(u64, em->len - offset, max_len); | |
cea9e445 CM |
4744 | } else { |
4745 | *length = em->len - offset; | |
4746 | } | |
f2d8d74d | 4747 | |
53b381b3 DW |
4748 | /* This is for when we're called from btrfs_merge_bio_hook() and all |
4749 | it cares about is the length */ | |
a1d3c478 | 4750 | if (!bbio_ret) |
cea9e445 CM |
4751 | goto out; |
4752 | ||
472262f3 SB |
4753 | btrfs_dev_replace_lock(dev_replace); |
4754 | dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace); | |
4755 | if (!dev_replace_is_ongoing) | |
4756 | btrfs_dev_replace_unlock(dev_replace); | |
4757 | ||
ad6d620e SB |
4758 | if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 && |
4759 | !(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) && | |
4760 | dev_replace->tgtdev != NULL) { | |
4761 | /* | |
4762 | * in dev-replace case, for repair case (that's the only | |
4763 | * case where the mirror is selected explicitly when | |
4764 | * calling btrfs_map_block), blocks left of the left cursor | |
4765 | * can also be read from the target drive. | |
4766 | * For REQ_GET_READ_MIRRORS, the target drive is added as | |
4767 | * the last one to the array of stripes. For READ, it also | |
4768 | * needs to be supported using the same mirror number. | |
4769 | * If the requested block is not left of the left cursor, | |
4770 | * EIO is returned. This can happen because btrfs_num_copies() | |
4771 | * returns one more in the dev-replace case. | |
4772 | */ | |
4773 | u64 tmp_length = *length; | |
4774 | struct btrfs_bio *tmp_bbio = NULL; | |
4775 | int tmp_num_stripes; | |
4776 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
4777 | int index_srcdev = 0; | |
4778 | int found = 0; | |
4779 | u64 physical_of_found = 0; | |
4780 | ||
4781 | ret = __btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, | |
53b381b3 | 4782 | logical, &tmp_length, &tmp_bbio, 0, NULL); |
ad6d620e SB |
4783 | if (ret) { |
4784 | WARN_ON(tmp_bbio != NULL); | |
4785 | goto out; | |
4786 | } | |
4787 | ||
4788 | tmp_num_stripes = tmp_bbio->num_stripes; | |
4789 | if (mirror_num > tmp_num_stripes) { | |
4790 | /* | |
4791 | * REQ_GET_READ_MIRRORS does not contain this | |
4792 | * mirror, that means that the requested area | |
4793 | * is not left of the left cursor | |
4794 | */ | |
4795 | ret = -EIO; | |
4796 | kfree(tmp_bbio); | |
4797 | goto out; | |
4798 | } | |
4799 | ||
4800 | /* | |
4801 | * process the rest of the function using the mirror_num | |
4802 | * of the source drive. Therefore look it up first. | |
4803 | * At the end, patch the device pointer to the one of the | |
4804 | * target drive. | |
4805 | */ | |
4806 | for (i = 0; i < tmp_num_stripes; i++) { | |
4807 | if (tmp_bbio->stripes[i].dev->devid == srcdev_devid) { | |
4808 | /* | |
4809 | * In case of DUP, in order to keep it | |
4810 | * simple, only add the mirror with the | |
4811 | * lowest physical address | |
4812 | */ | |
4813 | if (found && | |
4814 | physical_of_found <= | |
4815 | tmp_bbio->stripes[i].physical) | |
4816 | continue; | |
4817 | index_srcdev = i; | |
4818 | found = 1; | |
4819 | physical_of_found = | |
4820 | tmp_bbio->stripes[i].physical; | |
4821 | } | |
4822 | } | |
4823 | ||
4824 | if (found) { | |
4825 | mirror_num = index_srcdev + 1; | |
4826 | patch_the_first_stripe_for_dev_replace = 1; | |
4827 | physical_to_patch_in_first_stripe = physical_of_found; | |
4828 | } else { | |
4829 | WARN_ON(1); | |
4830 | ret = -EIO; | |
4831 | kfree(tmp_bbio); | |
4832 | goto out; | |
4833 | } | |
4834 | ||
4835 | kfree(tmp_bbio); | |
4836 | } else if (mirror_num > map->num_stripes) { | |
4837 | mirror_num = 0; | |
4838 | } | |
4839 | ||
f2d8d74d | 4840 | num_stripes = 1; |
cea9e445 | 4841 | stripe_index = 0; |
fce3bb9a | 4842 | stripe_nr_orig = stripe_nr; |
fda2832f | 4843 | stripe_nr_end = ALIGN(offset + *length, map->stripe_len); |
fce3bb9a LD |
4844 | do_div(stripe_nr_end, map->stripe_len); |
4845 | stripe_end_offset = stripe_nr_end * map->stripe_len - | |
4846 | (offset + *length); | |
53b381b3 | 4847 | |
fce3bb9a LD |
4848 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
4849 | if (rw & REQ_DISCARD) | |
4850 | num_stripes = min_t(u64, map->num_stripes, | |
4851 | stripe_nr_end - stripe_nr_orig); | |
4852 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
4853 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { | |
29a8d9a0 | 4854 | if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) |
f2d8d74d | 4855 | num_stripes = map->num_stripes; |
2fff734f | 4856 | else if (mirror_num) |
f188591e | 4857 | stripe_index = mirror_num - 1; |
dfe25020 | 4858 | else { |
30d9861f | 4859 | stripe_index = find_live_mirror(fs_info, map, 0, |
dfe25020 | 4860 | map->num_stripes, |
30d9861f SB |
4861 | current->pid % map->num_stripes, |
4862 | dev_replace_is_ongoing); | |
a1d3c478 | 4863 | mirror_num = stripe_index + 1; |
dfe25020 | 4864 | } |
2fff734f | 4865 | |
611f0e00 | 4866 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
29a8d9a0 | 4867 | if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) { |
f2d8d74d | 4868 | num_stripes = map->num_stripes; |
a1d3c478 | 4869 | } else if (mirror_num) { |
f188591e | 4870 | stripe_index = mirror_num - 1; |
a1d3c478 JS |
4871 | } else { |
4872 | mirror_num = 1; | |
4873 | } | |
2fff734f | 4874 | |
321aecc6 CM |
4875 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
4876 | int factor = map->num_stripes / map->sub_stripes; | |
321aecc6 CM |
4877 | |
4878 | stripe_index = do_div(stripe_nr, factor); | |
4879 | stripe_index *= map->sub_stripes; | |
4880 | ||
29a8d9a0 | 4881 | if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) |
f2d8d74d | 4882 | num_stripes = map->sub_stripes; |
fce3bb9a LD |
4883 | else if (rw & REQ_DISCARD) |
4884 | num_stripes = min_t(u64, map->sub_stripes * | |
4885 | (stripe_nr_end - stripe_nr_orig), | |
4886 | map->num_stripes); | |
321aecc6 CM |
4887 | else if (mirror_num) |
4888 | stripe_index += mirror_num - 1; | |
dfe25020 | 4889 | else { |
3e74317a | 4890 | int old_stripe_index = stripe_index; |
30d9861f SB |
4891 | stripe_index = find_live_mirror(fs_info, map, |
4892 | stripe_index, | |
dfe25020 | 4893 | map->sub_stripes, stripe_index + |
30d9861f SB |
4894 | current->pid % map->sub_stripes, |
4895 | dev_replace_is_ongoing); | |
3e74317a | 4896 | mirror_num = stripe_index - old_stripe_index + 1; |
dfe25020 | 4897 | } |
53b381b3 DW |
4898 | |
4899 | } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | | |
4900 | BTRFS_BLOCK_GROUP_RAID6)) { | |
4901 | u64 tmp; | |
4902 | ||
4903 | if (bbio_ret && ((rw & REQ_WRITE) || mirror_num > 1) | |
4904 | && raid_map_ret) { | |
4905 | int i, rot; | |
4906 | ||
4907 | /* push stripe_nr back to the start of the full stripe */ | |
4908 | stripe_nr = raid56_full_stripe_start; | |
4909 | do_div(stripe_nr, stripe_len); | |
4910 | ||
4911 | stripe_index = do_div(stripe_nr, nr_data_stripes(map)); | |
4912 | ||
4913 | /* RAID[56] write or recovery. Return all stripes */ | |
4914 | num_stripes = map->num_stripes; | |
4915 | max_errors = nr_parity_stripes(map); | |
4916 | ||
d9b0d9ba | 4917 | raid_map = kmalloc_array(num_stripes, sizeof(u64), |
53b381b3 DW |
4918 | GFP_NOFS); |
4919 | if (!raid_map) { | |
4920 | ret = -ENOMEM; | |
4921 | goto out; | |
4922 | } | |
4923 | ||
4924 | /* Work out the disk rotation on this stripe-set */ | |
4925 | tmp = stripe_nr; | |
4926 | rot = do_div(tmp, num_stripes); | |
4927 | ||
4928 | /* Fill in the logical address of each stripe */ | |
4929 | tmp = stripe_nr * nr_data_stripes(map); | |
4930 | for (i = 0; i < nr_data_stripes(map); i++) | |
4931 | raid_map[(i+rot) % num_stripes] = | |
4932 | em->start + (tmp + i) * map->stripe_len; | |
4933 | ||
4934 | raid_map[(i+rot) % map->num_stripes] = RAID5_P_STRIPE; | |
4935 | if (map->type & BTRFS_BLOCK_GROUP_RAID6) | |
4936 | raid_map[(i+rot+1) % num_stripes] = | |
4937 | RAID6_Q_STRIPE; | |
4938 | ||
4939 | *length = map->stripe_len; | |
4940 | stripe_index = 0; | |
4941 | stripe_offset = 0; | |
4942 | } else { | |
4943 | /* | |
4944 | * Mirror #0 or #1 means the original data block. | |
4945 | * Mirror #2 is RAID5 parity block. | |
4946 | * Mirror #3 is RAID6 Q block. | |
4947 | */ | |
4948 | stripe_index = do_div(stripe_nr, nr_data_stripes(map)); | |
4949 | if (mirror_num > 1) | |
4950 | stripe_index = nr_data_stripes(map) + | |
4951 | mirror_num - 2; | |
4952 | ||
4953 | /* We distribute the parity blocks across stripes */ | |
4954 | tmp = stripe_nr + stripe_index; | |
4955 | stripe_index = do_div(tmp, map->num_stripes); | |
4956 | } | |
8790d502 CM |
4957 | } else { |
4958 | /* | |
4959 | * after this do_div call, stripe_nr is the number of stripes | |
4960 | * on this device we have to walk to find the data, and | |
4961 | * stripe_index is the number of our device in the stripe array | |
4962 | */ | |
4963 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
a1d3c478 | 4964 | mirror_num = stripe_index + 1; |
8790d502 | 4965 | } |
593060d7 | 4966 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 4967 | |
472262f3 | 4968 | num_alloc_stripes = num_stripes; |
ad6d620e SB |
4969 | if (dev_replace_is_ongoing) { |
4970 | if (rw & (REQ_WRITE | REQ_DISCARD)) | |
4971 | num_alloc_stripes <<= 1; | |
4972 | if (rw & REQ_GET_READ_MIRRORS) | |
4973 | num_alloc_stripes++; | |
4974 | } | |
472262f3 | 4975 | bbio = kzalloc(btrfs_bio_size(num_alloc_stripes), GFP_NOFS); |
de11cc12 | 4976 | if (!bbio) { |
eb2067f7 | 4977 | kfree(raid_map); |
de11cc12 LZ |
4978 | ret = -ENOMEM; |
4979 | goto out; | |
4980 | } | |
4981 | atomic_set(&bbio->error, 0); | |
4982 | ||
fce3bb9a | 4983 | if (rw & REQ_DISCARD) { |
ec9ef7a1 LZ |
4984 | int factor = 0; |
4985 | int sub_stripes = 0; | |
4986 | u64 stripes_per_dev = 0; | |
4987 | u32 remaining_stripes = 0; | |
b89203f7 | 4988 | u32 last_stripe = 0; |
ec9ef7a1 LZ |
4989 | |
4990 | if (map->type & | |
4991 | (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID10)) { | |
4992 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
4993 | sub_stripes = 1; | |
4994 | else | |
4995 | sub_stripes = map->sub_stripes; | |
4996 | ||
4997 | factor = map->num_stripes / sub_stripes; | |
4998 | stripes_per_dev = div_u64_rem(stripe_nr_end - | |
4999 | stripe_nr_orig, | |
5000 | factor, | |
5001 | &remaining_stripes); | |
b89203f7 LB |
5002 | div_u64_rem(stripe_nr_end - 1, factor, &last_stripe); |
5003 | last_stripe *= sub_stripes; | |
ec9ef7a1 LZ |
5004 | } |
5005 | ||
fce3bb9a | 5006 | for (i = 0; i < num_stripes; i++) { |
a1d3c478 | 5007 | bbio->stripes[i].physical = |
f2d8d74d CM |
5008 | map->stripes[stripe_index].physical + |
5009 | stripe_offset + stripe_nr * map->stripe_len; | |
a1d3c478 | 5010 | bbio->stripes[i].dev = map->stripes[stripe_index].dev; |
fce3bb9a | 5011 | |
ec9ef7a1 LZ |
5012 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | |
5013 | BTRFS_BLOCK_GROUP_RAID10)) { | |
5014 | bbio->stripes[i].length = stripes_per_dev * | |
5015 | map->stripe_len; | |
b89203f7 | 5016 | |
ec9ef7a1 LZ |
5017 | if (i / sub_stripes < remaining_stripes) |
5018 | bbio->stripes[i].length += | |
5019 | map->stripe_len; | |
b89203f7 LB |
5020 | |
5021 | /* | |
5022 | * Special for the first stripe and | |
5023 | * the last stripe: | |
5024 | * | |
5025 | * |-------|...|-------| | |
5026 | * |----------| | |
5027 | * off end_off | |
5028 | */ | |
ec9ef7a1 | 5029 | if (i < sub_stripes) |
a1d3c478 | 5030 | bbio->stripes[i].length -= |
fce3bb9a | 5031 | stripe_offset; |
b89203f7 LB |
5032 | |
5033 | if (stripe_index >= last_stripe && | |
5034 | stripe_index <= (last_stripe + | |
5035 | sub_stripes - 1)) | |
a1d3c478 | 5036 | bbio->stripes[i].length -= |
fce3bb9a | 5037 | stripe_end_offset; |
b89203f7 | 5038 | |
ec9ef7a1 LZ |
5039 | if (i == sub_stripes - 1) |
5040 | stripe_offset = 0; | |
fce3bb9a | 5041 | } else |
a1d3c478 | 5042 | bbio->stripes[i].length = *length; |
fce3bb9a LD |
5043 | |
5044 | stripe_index++; | |
5045 | if (stripe_index == map->num_stripes) { | |
5046 | /* This could only happen for RAID0/10 */ | |
5047 | stripe_index = 0; | |
5048 | stripe_nr++; | |
5049 | } | |
5050 | } | |
5051 | } else { | |
5052 | for (i = 0; i < num_stripes; i++) { | |
a1d3c478 | 5053 | bbio->stripes[i].physical = |
212a17ab LT |
5054 | map->stripes[stripe_index].physical + |
5055 | stripe_offset + | |
5056 | stripe_nr * map->stripe_len; | |
a1d3c478 | 5057 | bbio->stripes[i].dev = |
212a17ab | 5058 | map->stripes[stripe_index].dev; |
fce3bb9a | 5059 | stripe_index++; |
f2d8d74d | 5060 | } |
593060d7 | 5061 | } |
de11cc12 | 5062 | |
29a8d9a0 | 5063 | if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) { |
de11cc12 LZ |
5064 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | |
5065 | BTRFS_BLOCK_GROUP_RAID10 | | |
53b381b3 | 5066 | BTRFS_BLOCK_GROUP_RAID5 | |
de11cc12 LZ |
5067 | BTRFS_BLOCK_GROUP_DUP)) { |
5068 | max_errors = 1; | |
53b381b3 DW |
5069 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID6) { |
5070 | max_errors = 2; | |
de11cc12 | 5071 | } |
f2d8d74d | 5072 | } |
de11cc12 | 5073 | |
472262f3 SB |
5074 | if (dev_replace_is_ongoing && (rw & (REQ_WRITE | REQ_DISCARD)) && |
5075 | dev_replace->tgtdev != NULL) { | |
5076 | int index_where_to_add; | |
5077 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
5078 | ||
5079 | /* | |
5080 | * duplicate the write operations while the dev replace | |
5081 | * procedure is running. Since the copying of the old disk | |
5082 | * to the new disk takes place at run time while the | |
5083 | * filesystem is mounted writable, the regular write | |
5084 | * operations to the old disk have to be duplicated to go | |
5085 | * to the new disk as well. | |
5086 | * Note that device->missing is handled by the caller, and | |
5087 | * that the write to the old disk is already set up in the | |
5088 | * stripes array. | |
5089 | */ | |
5090 | index_where_to_add = num_stripes; | |
5091 | for (i = 0; i < num_stripes; i++) { | |
5092 | if (bbio->stripes[i].dev->devid == srcdev_devid) { | |
5093 | /* write to new disk, too */ | |
5094 | struct btrfs_bio_stripe *new = | |
5095 | bbio->stripes + index_where_to_add; | |
5096 | struct btrfs_bio_stripe *old = | |
5097 | bbio->stripes + i; | |
5098 | ||
5099 | new->physical = old->physical; | |
5100 | new->length = old->length; | |
5101 | new->dev = dev_replace->tgtdev; | |
5102 | index_where_to_add++; | |
5103 | max_errors++; | |
5104 | } | |
5105 | } | |
5106 | num_stripes = index_where_to_add; | |
ad6d620e SB |
5107 | } else if (dev_replace_is_ongoing && (rw & REQ_GET_READ_MIRRORS) && |
5108 | dev_replace->tgtdev != NULL) { | |
5109 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
5110 | int index_srcdev = 0; | |
5111 | int found = 0; | |
5112 | u64 physical_of_found = 0; | |
5113 | ||
5114 | /* | |
5115 | * During the dev-replace procedure, the target drive can | |
5116 | * also be used to read data in case it is needed to repair | |
5117 | * a corrupt block elsewhere. This is possible if the | |
5118 | * requested area is left of the left cursor. In this area, | |
5119 | * the target drive is a full copy of the source drive. | |
5120 | */ | |
5121 | for (i = 0; i < num_stripes; i++) { | |
5122 | if (bbio->stripes[i].dev->devid == srcdev_devid) { | |
5123 | /* | |
5124 | * In case of DUP, in order to keep it | |
5125 | * simple, only add the mirror with the | |
5126 | * lowest physical address | |
5127 | */ | |
5128 | if (found && | |
5129 | physical_of_found <= | |
5130 | bbio->stripes[i].physical) | |
5131 | continue; | |
5132 | index_srcdev = i; | |
5133 | found = 1; | |
5134 | physical_of_found = bbio->stripes[i].physical; | |
5135 | } | |
5136 | } | |
5137 | if (found) { | |
5138 | u64 length = map->stripe_len; | |
5139 | ||
5140 | if (physical_of_found + length <= | |
5141 | dev_replace->cursor_left) { | |
5142 | struct btrfs_bio_stripe *tgtdev_stripe = | |
5143 | bbio->stripes + num_stripes; | |
5144 | ||
5145 | tgtdev_stripe->physical = physical_of_found; | |
5146 | tgtdev_stripe->length = | |
5147 | bbio->stripes[index_srcdev].length; | |
5148 | tgtdev_stripe->dev = dev_replace->tgtdev; | |
5149 | ||
5150 | num_stripes++; | |
5151 | } | |
5152 | } | |
472262f3 SB |
5153 | } |
5154 | ||
de11cc12 LZ |
5155 | *bbio_ret = bbio; |
5156 | bbio->num_stripes = num_stripes; | |
5157 | bbio->max_errors = max_errors; | |
5158 | bbio->mirror_num = mirror_num; | |
ad6d620e SB |
5159 | |
5160 | /* | |
5161 | * this is the case that REQ_READ && dev_replace_is_ongoing && | |
5162 | * mirror_num == num_stripes + 1 && dev_replace target drive is | |
5163 | * available as a mirror | |
5164 | */ | |
5165 | if (patch_the_first_stripe_for_dev_replace && num_stripes > 0) { | |
5166 | WARN_ON(num_stripes > 1); | |
5167 | bbio->stripes[0].dev = dev_replace->tgtdev; | |
5168 | bbio->stripes[0].physical = physical_to_patch_in_first_stripe; | |
5169 | bbio->mirror_num = map->num_stripes + 1; | |
5170 | } | |
53b381b3 DW |
5171 | if (raid_map) { |
5172 | sort_parity_stripes(bbio, raid_map); | |
5173 | *raid_map_ret = raid_map; | |
5174 | } | |
cea9e445 | 5175 | out: |
472262f3 SB |
5176 | if (dev_replace_is_ongoing) |
5177 | btrfs_dev_replace_unlock(dev_replace); | |
0b86a832 | 5178 | free_extent_map(em); |
de11cc12 | 5179 | return ret; |
0b86a832 CM |
5180 | } |
5181 | ||
3ec706c8 | 5182 | int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, |
f2d8d74d | 5183 | u64 logical, u64 *length, |
a1d3c478 | 5184 | struct btrfs_bio **bbio_ret, int mirror_num) |
f2d8d74d | 5185 | { |
3ec706c8 | 5186 | return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret, |
53b381b3 | 5187 | mirror_num, NULL); |
f2d8d74d CM |
5188 | } |
5189 | ||
a512bbf8 YZ |
5190 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
5191 | u64 chunk_start, u64 physical, u64 devid, | |
5192 | u64 **logical, int *naddrs, int *stripe_len) | |
5193 | { | |
5194 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
5195 | struct extent_map *em; | |
5196 | struct map_lookup *map; | |
5197 | u64 *buf; | |
5198 | u64 bytenr; | |
5199 | u64 length; | |
5200 | u64 stripe_nr; | |
53b381b3 | 5201 | u64 rmap_len; |
a512bbf8 YZ |
5202 | int i, j, nr = 0; |
5203 | ||
890871be | 5204 | read_lock(&em_tree->lock); |
a512bbf8 | 5205 | em = lookup_extent_mapping(em_tree, chunk_start, 1); |
890871be | 5206 | read_unlock(&em_tree->lock); |
a512bbf8 | 5207 | |
835d974f | 5208 | if (!em) { |
efe120a0 | 5209 | printk(KERN_ERR "BTRFS: couldn't find em for chunk %Lu\n", |
835d974f JB |
5210 | chunk_start); |
5211 | return -EIO; | |
5212 | } | |
5213 | ||
5214 | if (em->start != chunk_start) { | |
efe120a0 | 5215 | printk(KERN_ERR "BTRFS: bad chunk start, em=%Lu, wanted=%Lu\n", |
835d974f JB |
5216 | em->start, chunk_start); |
5217 | free_extent_map(em); | |
5218 | return -EIO; | |
5219 | } | |
a512bbf8 YZ |
5220 | map = (struct map_lookup *)em->bdev; |
5221 | ||
5222 | length = em->len; | |
53b381b3 DW |
5223 | rmap_len = map->stripe_len; |
5224 | ||
a512bbf8 YZ |
5225 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
5226 | do_div(length, map->num_stripes / map->sub_stripes); | |
5227 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
5228 | do_div(length, map->num_stripes); | |
53b381b3 DW |
5229 | else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | |
5230 | BTRFS_BLOCK_GROUP_RAID6)) { | |
5231 | do_div(length, nr_data_stripes(map)); | |
5232 | rmap_len = map->stripe_len * nr_data_stripes(map); | |
5233 | } | |
a512bbf8 YZ |
5234 | |
5235 | buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); | |
79787eaa | 5236 | BUG_ON(!buf); /* -ENOMEM */ |
a512bbf8 YZ |
5237 | |
5238 | for (i = 0; i < map->num_stripes; i++) { | |
5239 | if (devid && map->stripes[i].dev->devid != devid) | |
5240 | continue; | |
5241 | if (map->stripes[i].physical > physical || | |
5242 | map->stripes[i].physical + length <= physical) | |
5243 | continue; | |
5244 | ||
5245 | stripe_nr = physical - map->stripes[i].physical; | |
5246 | do_div(stripe_nr, map->stripe_len); | |
5247 | ||
5248 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
5249 | stripe_nr = stripe_nr * map->num_stripes + i; | |
5250 | do_div(stripe_nr, map->sub_stripes); | |
5251 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
5252 | stripe_nr = stripe_nr * map->num_stripes + i; | |
53b381b3 DW |
5253 | } /* else if RAID[56], multiply by nr_data_stripes(). |
5254 | * Alternatively, just use rmap_len below instead of | |
5255 | * map->stripe_len */ | |
5256 | ||
5257 | bytenr = chunk_start + stripe_nr * rmap_len; | |
934d375b | 5258 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
5259 | for (j = 0; j < nr; j++) { |
5260 | if (buf[j] == bytenr) | |
5261 | break; | |
5262 | } | |
934d375b CM |
5263 | if (j == nr) { |
5264 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 5265 | buf[nr++] = bytenr; |
934d375b | 5266 | } |
a512bbf8 YZ |
5267 | } |
5268 | ||
a512bbf8 YZ |
5269 | *logical = buf; |
5270 | *naddrs = nr; | |
53b381b3 | 5271 | *stripe_len = rmap_len; |
a512bbf8 YZ |
5272 | |
5273 | free_extent_map(em); | |
5274 | return 0; | |
f2d8d74d CM |
5275 | } |
5276 | ||
a1d3c478 | 5277 | static void btrfs_end_bio(struct bio *bio, int err) |
8790d502 | 5278 | { |
9be3395b | 5279 | struct btrfs_bio *bbio = bio->bi_private; |
c404e0dc | 5280 | struct btrfs_device *dev = bbio->stripes[0].dev; |
7d2b4daa | 5281 | int is_orig_bio = 0; |
8790d502 | 5282 | |
442a4f63 | 5283 | if (err) { |
a1d3c478 | 5284 | atomic_inc(&bbio->error); |
442a4f63 SB |
5285 | if (err == -EIO || err == -EREMOTEIO) { |
5286 | unsigned int stripe_index = | |
9be3395b | 5287 | btrfs_io_bio(bio)->stripe_index; |
442a4f63 SB |
5288 | |
5289 | BUG_ON(stripe_index >= bbio->num_stripes); | |
5290 | dev = bbio->stripes[stripe_index].dev; | |
597a60fa SB |
5291 | if (dev->bdev) { |
5292 | if (bio->bi_rw & WRITE) | |
5293 | btrfs_dev_stat_inc(dev, | |
5294 | BTRFS_DEV_STAT_WRITE_ERRS); | |
5295 | else | |
5296 | btrfs_dev_stat_inc(dev, | |
5297 | BTRFS_DEV_STAT_READ_ERRS); | |
5298 | if ((bio->bi_rw & WRITE_FLUSH) == WRITE_FLUSH) | |
5299 | btrfs_dev_stat_inc(dev, | |
5300 | BTRFS_DEV_STAT_FLUSH_ERRS); | |
5301 | btrfs_dev_stat_print_on_error(dev); | |
5302 | } | |
442a4f63 SB |
5303 | } |
5304 | } | |
8790d502 | 5305 | |
a1d3c478 | 5306 | if (bio == bbio->orig_bio) |
7d2b4daa CM |
5307 | is_orig_bio = 1; |
5308 | ||
c404e0dc MX |
5309 | btrfs_bio_counter_dec(bbio->fs_info); |
5310 | ||
a1d3c478 | 5311 | if (atomic_dec_and_test(&bbio->stripes_pending)) { |
7d2b4daa CM |
5312 | if (!is_orig_bio) { |
5313 | bio_put(bio); | |
a1d3c478 | 5314 | bio = bbio->orig_bio; |
7d2b4daa | 5315 | } |
a1d3c478 JS |
5316 | bio->bi_private = bbio->private; |
5317 | bio->bi_end_io = bbio->end_io; | |
9be3395b | 5318 | btrfs_io_bio(bio)->mirror_num = bbio->mirror_num; |
a236aed1 | 5319 | /* only send an error to the higher layers if it is |
53b381b3 | 5320 | * beyond the tolerance of the btrfs bio |
a236aed1 | 5321 | */ |
a1d3c478 | 5322 | if (atomic_read(&bbio->error) > bbio->max_errors) { |
a236aed1 | 5323 | err = -EIO; |
5dbc8fca | 5324 | } else { |
1259ab75 CM |
5325 | /* |
5326 | * this bio is actually up to date, we didn't | |
5327 | * go over the max number of errors | |
5328 | */ | |
5329 | set_bit(BIO_UPTODATE, &bio->bi_flags); | |
a236aed1 | 5330 | err = 0; |
1259ab75 | 5331 | } |
a1d3c478 | 5332 | kfree(bbio); |
8790d502 CM |
5333 | |
5334 | bio_endio(bio, err); | |
7d2b4daa | 5335 | } else if (!is_orig_bio) { |
8790d502 CM |
5336 | bio_put(bio); |
5337 | } | |
8790d502 CM |
5338 | } |
5339 | ||
8b712842 CM |
5340 | /* |
5341 | * see run_scheduled_bios for a description of why bios are collected for | |
5342 | * async submit. | |
5343 | * | |
5344 | * This will add one bio to the pending list for a device and make sure | |
5345 | * the work struct is scheduled. | |
5346 | */ | |
48a3b636 ES |
5347 | static noinline void btrfs_schedule_bio(struct btrfs_root *root, |
5348 | struct btrfs_device *device, | |
5349 | int rw, struct bio *bio) | |
8b712842 CM |
5350 | { |
5351 | int should_queue = 1; | |
ffbd517d | 5352 | struct btrfs_pending_bios *pending_bios; |
8b712842 | 5353 | |
53b381b3 DW |
5354 | if (device->missing || !device->bdev) { |
5355 | bio_endio(bio, -EIO); | |
5356 | return; | |
5357 | } | |
5358 | ||
8b712842 | 5359 | /* don't bother with additional async steps for reads, right now */ |
7b6d91da | 5360 | if (!(rw & REQ_WRITE)) { |
492bb6de | 5361 | bio_get(bio); |
21adbd5c | 5362 | btrfsic_submit_bio(rw, bio); |
492bb6de | 5363 | bio_put(bio); |
143bede5 | 5364 | return; |
8b712842 CM |
5365 | } |
5366 | ||
5367 | /* | |
0986fe9e | 5368 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
5369 | * higher layers. Otherwise, the async bio makes it appear we have |
5370 | * made progress against dirty pages when we've really just put it | |
5371 | * on a queue for later | |
5372 | */ | |
0986fe9e | 5373 | atomic_inc(&root->fs_info->nr_async_bios); |
492bb6de | 5374 | WARN_ON(bio->bi_next); |
8b712842 CM |
5375 | bio->bi_next = NULL; |
5376 | bio->bi_rw |= rw; | |
5377 | ||
5378 | spin_lock(&device->io_lock); | |
7b6d91da | 5379 | if (bio->bi_rw & REQ_SYNC) |
ffbd517d CM |
5380 | pending_bios = &device->pending_sync_bios; |
5381 | else | |
5382 | pending_bios = &device->pending_bios; | |
8b712842 | 5383 | |
ffbd517d CM |
5384 | if (pending_bios->tail) |
5385 | pending_bios->tail->bi_next = bio; | |
8b712842 | 5386 | |
ffbd517d CM |
5387 | pending_bios->tail = bio; |
5388 | if (!pending_bios->head) | |
5389 | pending_bios->head = bio; | |
8b712842 CM |
5390 | if (device->running_pending) |
5391 | should_queue = 0; | |
5392 | ||
5393 | spin_unlock(&device->io_lock); | |
5394 | ||
5395 | if (should_queue) | |
a8c93d4e QW |
5396 | btrfs_queue_work(root->fs_info->submit_workers, |
5397 | &device->work); | |
8b712842 CM |
5398 | } |
5399 | ||
de1ee92a JB |
5400 | static int bio_size_ok(struct block_device *bdev, struct bio *bio, |
5401 | sector_t sector) | |
5402 | { | |
5403 | struct bio_vec *prev; | |
5404 | struct request_queue *q = bdev_get_queue(bdev); | |
475bf36f | 5405 | unsigned int max_sectors = queue_max_sectors(q); |
de1ee92a JB |
5406 | struct bvec_merge_data bvm = { |
5407 | .bi_bdev = bdev, | |
5408 | .bi_sector = sector, | |
5409 | .bi_rw = bio->bi_rw, | |
5410 | }; | |
5411 | ||
fae7f21c | 5412 | if (WARN_ON(bio->bi_vcnt == 0)) |
de1ee92a | 5413 | return 1; |
de1ee92a JB |
5414 | |
5415 | prev = &bio->bi_io_vec[bio->bi_vcnt - 1]; | |
aa8b57aa | 5416 | if (bio_sectors(bio) > max_sectors) |
de1ee92a JB |
5417 | return 0; |
5418 | ||
5419 | if (!q->merge_bvec_fn) | |
5420 | return 1; | |
5421 | ||
5422 | bvm.bi_size = bio->bi_size - prev->bv_len; | |
5423 | if (q->merge_bvec_fn(q, &bvm, prev) < prev->bv_len) | |
5424 | return 0; | |
5425 | return 1; | |
5426 | } | |
5427 | ||
5428 | static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio, | |
5429 | struct bio *bio, u64 physical, int dev_nr, | |
5430 | int rw, int async) | |
5431 | { | |
5432 | struct btrfs_device *dev = bbio->stripes[dev_nr].dev; | |
5433 | ||
5434 | bio->bi_private = bbio; | |
9be3395b | 5435 | btrfs_io_bio(bio)->stripe_index = dev_nr; |
de1ee92a JB |
5436 | bio->bi_end_io = btrfs_end_bio; |
5437 | bio->bi_sector = physical >> 9; | |
5438 | #ifdef DEBUG | |
5439 | { | |
5440 | struct rcu_string *name; | |
5441 | ||
5442 | rcu_read_lock(); | |
5443 | name = rcu_dereference(dev->name); | |
d1423248 | 5444 | pr_debug("btrfs_map_bio: rw %d, sector=%llu, dev=%lu " |
de1ee92a JB |
5445 | "(%s id %llu), size=%u\n", rw, |
5446 | (u64)bio->bi_sector, (u_long)dev->bdev->bd_dev, | |
5447 | name->str, dev->devid, bio->bi_size); | |
5448 | rcu_read_unlock(); | |
5449 | } | |
5450 | #endif | |
5451 | bio->bi_bdev = dev->bdev; | |
c404e0dc MX |
5452 | |
5453 | btrfs_bio_counter_inc_noblocked(root->fs_info); | |
5454 | ||
de1ee92a | 5455 | if (async) |
53b381b3 | 5456 | btrfs_schedule_bio(root, dev, rw, bio); |
de1ee92a JB |
5457 | else |
5458 | btrfsic_submit_bio(rw, bio); | |
5459 | } | |
5460 | ||
5461 | static int breakup_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio, | |
5462 | struct bio *first_bio, struct btrfs_device *dev, | |
5463 | int dev_nr, int rw, int async) | |
5464 | { | |
5465 | struct bio_vec *bvec = first_bio->bi_io_vec; | |
5466 | struct bio *bio; | |
5467 | int nr_vecs = bio_get_nr_vecs(dev->bdev); | |
5468 | u64 physical = bbio->stripes[dev_nr].physical; | |
5469 | ||
5470 | again: | |
5471 | bio = btrfs_bio_alloc(dev->bdev, physical >> 9, nr_vecs, GFP_NOFS); | |
5472 | if (!bio) | |
5473 | return -ENOMEM; | |
5474 | ||
5475 | while (bvec <= (first_bio->bi_io_vec + first_bio->bi_vcnt - 1)) { | |
5476 | if (bio_add_page(bio, bvec->bv_page, bvec->bv_len, | |
5477 | bvec->bv_offset) < bvec->bv_len) { | |
5478 | u64 len = bio->bi_size; | |
5479 | ||
5480 | atomic_inc(&bbio->stripes_pending); | |
5481 | submit_stripe_bio(root, bbio, bio, physical, dev_nr, | |
5482 | rw, async); | |
5483 | physical += len; | |
5484 | goto again; | |
5485 | } | |
5486 | bvec++; | |
5487 | } | |
5488 | ||
5489 | submit_stripe_bio(root, bbio, bio, physical, dev_nr, rw, async); | |
5490 | return 0; | |
5491 | } | |
5492 | ||
5493 | static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical) | |
5494 | { | |
5495 | atomic_inc(&bbio->error); | |
5496 | if (atomic_dec_and_test(&bbio->stripes_pending)) { | |
5497 | bio->bi_private = bbio->private; | |
5498 | bio->bi_end_io = bbio->end_io; | |
9be3395b | 5499 | btrfs_io_bio(bio)->mirror_num = bbio->mirror_num; |
de1ee92a JB |
5500 | bio->bi_sector = logical >> 9; |
5501 | kfree(bbio); | |
5502 | bio_endio(bio, -EIO); | |
5503 | } | |
5504 | } | |
5505 | ||
f188591e | 5506 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 5507 | int mirror_num, int async_submit) |
0b86a832 | 5508 | { |
0b86a832 | 5509 | struct btrfs_device *dev; |
8790d502 | 5510 | struct bio *first_bio = bio; |
a62b9401 | 5511 | u64 logical = (u64)bio->bi_sector << 9; |
0b86a832 CM |
5512 | u64 length = 0; |
5513 | u64 map_length; | |
53b381b3 | 5514 | u64 *raid_map = NULL; |
0b86a832 | 5515 | int ret; |
8790d502 CM |
5516 | int dev_nr = 0; |
5517 | int total_devs = 1; | |
a1d3c478 | 5518 | struct btrfs_bio *bbio = NULL; |
0b86a832 | 5519 | |
f2d8d74d | 5520 | length = bio->bi_size; |
0b86a832 | 5521 | map_length = length; |
cea9e445 | 5522 | |
c404e0dc | 5523 | btrfs_bio_counter_inc_blocked(root->fs_info); |
53b381b3 DW |
5524 | ret = __btrfs_map_block(root->fs_info, rw, logical, &map_length, &bbio, |
5525 | mirror_num, &raid_map); | |
c404e0dc MX |
5526 | if (ret) { |
5527 | btrfs_bio_counter_dec(root->fs_info); | |
79787eaa | 5528 | return ret; |
c404e0dc | 5529 | } |
cea9e445 | 5530 | |
a1d3c478 | 5531 | total_devs = bbio->num_stripes; |
53b381b3 DW |
5532 | bbio->orig_bio = first_bio; |
5533 | bbio->private = first_bio->bi_private; | |
5534 | bbio->end_io = first_bio->bi_end_io; | |
c404e0dc | 5535 | bbio->fs_info = root->fs_info; |
53b381b3 DW |
5536 | atomic_set(&bbio->stripes_pending, bbio->num_stripes); |
5537 | ||
5538 | if (raid_map) { | |
5539 | /* In this case, map_length has been set to the length of | |
5540 | a single stripe; not the whole write */ | |
5541 | if (rw & WRITE) { | |
c404e0dc MX |
5542 | ret = raid56_parity_write(root, bio, bbio, |
5543 | raid_map, map_length); | |
53b381b3 | 5544 | } else { |
c404e0dc MX |
5545 | ret = raid56_parity_recover(root, bio, bbio, |
5546 | raid_map, map_length, | |
5547 | mirror_num); | |
53b381b3 | 5548 | } |
c404e0dc MX |
5549 | /* |
5550 | * FIXME, replace dosen't support raid56 yet, please fix | |
5551 | * it in the future. | |
5552 | */ | |
5553 | btrfs_bio_counter_dec(root->fs_info); | |
5554 | return ret; | |
53b381b3 DW |
5555 | } |
5556 | ||
cea9e445 | 5557 | if (map_length < length) { |
c2cf52eb | 5558 | btrfs_crit(root->fs_info, "mapping failed logical %llu bio len %llu len %llu", |
c1c9ff7c | 5559 | logical, length, map_length); |
cea9e445 CM |
5560 | BUG(); |
5561 | } | |
a1d3c478 | 5562 | |
d397712b | 5563 | while (dev_nr < total_devs) { |
de1ee92a JB |
5564 | dev = bbio->stripes[dev_nr].dev; |
5565 | if (!dev || !dev->bdev || (rw & WRITE && !dev->writeable)) { | |
5566 | bbio_error(bbio, first_bio, logical); | |
5567 | dev_nr++; | |
5568 | continue; | |
5569 | } | |
5570 | ||
5571 | /* | |
5572 | * Check and see if we're ok with this bio based on it's size | |
5573 | * and offset with the given device. | |
5574 | */ | |
5575 | if (!bio_size_ok(dev->bdev, first_bio, | |
5576 | bbio->stripes[dev_nr].physical >> 9)) { | |
5577 | ret = breakup_stripe_bio(root, bbio, first_bio, dev, | |
5578 | dev_nr, rw, async_submit); | |
5579 | BUG_ON(ret); | |
5580 | dev_nr++; | |
5581 | continue; | |
5582 | } | |
5583 | ||
a1d3c478 | 5584 | if (dev_nr < total_devs - 1) { |
9be3395b | 5585 | bio = btrfs_bio_clone(first_bio, GFP_NOFS); |
79787eaa | 5586 | BUG_ON(!bio); /* -ENOMEM */ |
a1d3c478 JS |
5587 | } else { |
5588 | bio = first_bio; | |
8790d502 | 5589 | } |
de1ee92a JB |
5590 | |
5591 | submit_stripe_bio(root, bbio, bio, | |
5592 | bbio->stripes[dev_nr].physical, dev_nr, rw, | |
5593 | async_submit); | |
8790d502 CM |
5594 | dev_nr++; |
5595 | } | |
c404e0dc | 5596 | btrfs_bio_counter_dec(root->fs_info); |
0b86a832 CM |
5597 | return 0; |
5598 | } | |
5599 | ||
aa1b8cd4 | 5600 | struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid, |
2b82032c | 5601 | u8 *uuid, u8 *fsid) |
0b86a832 | 5602 | { |
2b82032c YZ |
5603 | struct btrfs_device *device; |
5604 | struct btrfs_fs_devices *cur_devices; | |
5605 | ||
aa1b8cd4 | 5606 | cur_devices = fs_info->fs_devices; |
2b82032c YZ |
5607 | while (cur_devices) { |
5608 | if (!fsid || | |
5609 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
5610 | device = __find_device(&cur_devices->devices, | |
5611 | devid, uuid); | |
5612 | if (device) | |
5613 | return device; | |
5614 | } | |
5615 | cur_devices = cur_devices->seed; | |
5616 | } | |
5617 | return NULL; | |
0b86a832 CM |
5618 | } |
5619 | ||
dfe25020 CM |
5620 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
5621 | u64 devid, u8 *dev_uuid) | |
5622 | { | |
5623 | struct btrfs_device *device; | |
5624 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
5625 | ||
12bd2fc0 ID |
5626 | device = btrfs_alloc_device(NULL, &devid, dev_uuid); |
5627 | if (IS_ERR(device)) | |
7cbd8a83 | 5628 | return NULL; |
12bd2fc0 ID |
5629 | |
5630 | list_add(&device->dev_list, &fs_devices->devices); | |
e4404d6e | 5631 | device->fs_devices = fs_devices; |
dfe25020 | 5632 | fs_devices->num_devices++; |
12bd2fc0 ID |
5633 | |
5634 | device->missing = 1; | |
cd02dca5 | 5635 | fs_devices->missing_devices++; |
12bd2fc0 | 5636 | |
dfe25020 CM |
5637 | return device; |
5638 | } | |
5639 | ||
12bd2fc0 ID |
5640 | /** |
5641 | * btrfs_alloc_device - allocate struct btrfs_device | |
5642 | * @fs_info: used only for generating a new devid, can be NULL if | |
5643 | * devid is provided (i.e. @devid != NULL). | |
5644 | * @devid: a pointer to devid for this device. If NULL a new devid | |
5645 | * is generated. | |
5646 | * @uuid: a pointer to UUID for this device. If NULL a new UUID | |
5647 | * is generated. | |
5648 | * | |
5649 | * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR() | |
5650 | * on error. Returned struct is not linked onto any lists and can be | |
5651 | * destroyed with kfree() right away. | |
5652 | */ | |
5653 | struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, | |
5654 | const u64 *devid, | |
5655 | const u8 *uuid) | |
5656 | { | |
5657 | struct btrfs_device *dev; | |
5658 | u64 tmp; | |
5659 | ||
fae7f21c | 5660 | if (WARN_ON(!devid && !fs_info)) |
12bd2fc0 | 5661 | return ERR_PTR(-EINVAL); |
12bd2fc0 ID |
5662 | |
5663 | dev = __alloc_device(); | |
5664 | if (IS_ERR(dev)) | |
5665 | return dev; | |
5666 | ||
5667 | if (devid) | |
5668 | tmp = *devid; | |
5669 | else { | |
5670 | int ret; | |
5671 | ||
5672 | ret = find_next_devid(fs_info, &tmp); | |
5673 | if (ret) { | |
5674 | kfree(dev); | |
5675 | return ERR_PTR(ret); | |
5676 | } | |
5677 | } | |
5678 | dev->devid = tmp; | |
5679 | ||
5680 | if (uuid) | |
5681 | memcpy(dev->uuid, uuid, BTRFS_UUID_SIZE); | |
5682 | else | |
5683 | generate_random_uuid(dev->uuid); | |
5684 | ||
a8c93d4e | 5685 | btrfs_init_work(&dev->work, pending_bios_fn, NULL, NULL); |
12bd2fc0 ID |
5686 | |
5687 | return dev; | |
5688 | } | |
5689 | ||
0b86a832 CM |
5690 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
5691 | struct extent_buffer *leaf, | |
5692 | struct btrfs_chunk *chunk) | |
5693 | { | |
5694 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
5695 | struct map_lookup *map; | |
5696 | struct extent_map *em; | |
5697 | u64 logical; | |
5698 | u64 length; | |
5699 | u64 devid; | |
a443755f | 5700 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 5701 | int num_stripes; |
0b86a832 | 5702 | int ret; |
593060d7 | 5703 | int i; |
0b86a832 | 5704 | |
e17cade2 CM |
5705 | logical = key->offset; |
5706 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 5707 | |
890871be | 5708 | read_lock(&map_tree->map_tree.lock); |
0b86a832 | 5709 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
890871be | 5710 | read_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
5711 | |
5712 | /* already mapped? */ | |
5713 | if (em && em->start <= logical && em->start + em->len > logical) { | |
5714 | free_extent_map(em); | |
0b86a832 CM |
5715 | return 0; |
5716 | } else if (em) { | |
5717 | free_extent_map(em); | |
5718 | } | |
0b86a832 | 5719 | |
172ddd60 | 5720 | em = alloc_extent_map(); |
0b86a832 CM |
5721 | if (!em) |
5722 | return -ENOMEM; | |
593060d7 CM |
5723 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
5724 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
5725 | if (!map) { |
5726 | free_extent_map(em); | |
5727 | return -ENOMEM; | |
5728 | } | |
5729 | ||
5730 | em->bdev = (struct block_device *)map; | |
5731 | em->start = logical; | |
5732 | em->len = length; | |
70c8a91c | 5733 | em->orig_start = 0; |
0b86a832 | 5734 | em->block_start = 0; |
c8b97818 | 5735 | em->block_len = em->len; |
0b86a832 | 5736 | |
593060d7 CM |
5737 | map->num_stripes = num_stripes; |
5738 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
5739 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
5740 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
5741 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
5742 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 5743 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
5744 | for (i = 0; i < num_stripes; i++) { |
5745 | map->stripes[i].physical = | |
5746 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
5747 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
5748 | read_extent_buffer(leaf, uuid, (unsigned long) |
5749 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
5750 | BTRFS_UUID_SIZE); | |
aa1b8cd4 SB |
5751 | map->stripes[i].dev = btrfs_find_device(root->fs_info, devid, |
5752 | uuid, NULL); | |
dfe25020 | 5753 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
593060d7 CM |
5754 | kfree(map); |
5755 | free_extent_map(em); | |
5756 | return -EIO; | |
5757 | } | |
dfe25020 CM |
5758 | if (!map->stripes[i].dev) { |
5759 | map->stripes[i].dev = | |
5760 | add_missing_dev(root, devid, uuid); | |
5761 | if (!map->stripes[i].dev) { | |
5762 | kfree(map); | |
5763 | free_extent_map(em); | |
5764 | return -EIO; | |
5765 | } | |
5766 | } | |
5767 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
5768 | } |
5769 | ||
890871be | 5770 | write_lock(&map_tree->map_tree.lock); |
09a2a8f9 | 5771 | ret = add_extent_mapping(&map_tree->map_tree, em, 0); |
890871be | 5772 | write_unlock(&map_tree->map_tree.lock); |
79787eaa | 5773 | BUG_ON(ret); /* Tree corruption */ |
0b86a832 CM |
5774 | free_extent_map(em); |
5775 | ||
5776 | return 0; | |
5777 | } | |
5778 | ||
143bede5 | 5779 | static void fill_device_from_item(struct extent_buffer *leaf, |
0b86a832 CM |
5780 | struct btrfs_dev_item *dev_item, |
5781 | struct btrfs_device *device) | |
5782 | { | |
5783 | unsigned long ptr; | |
0b86a832 CM |
5784 | |
5785 | device->devid = btrfs_device_id(leaf, dev_item); | |
d6397bae CB |
5786 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
5787 | device->total_bytes = device->disk_total_bytes; | |
0b86a832 CM |
5788 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
5789 | device->type = btrfs_device_type(leaf, dev_item); | |
5790 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
5791 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
5792 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
8dabb742 | 5793 | WARN_ON(device->devid == BTRFS_DEV_REPLACE_DEVID); |
63a212ab | 5794 | device->is_tgtdev_for_dev_replace = 0; |
0b86a832 | 5795 | |
410ba3a2 | 5796 | ptr = btrfs_device_uuid(dev_item); |
e17cade2 | 5797 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 CM |
5798 | } |
5799 | ||
2b82032c YZ |
5800 | static int open_seed_devices(struct btrfs_root *root, u8 *fsid) |
5801 | { | |
5802 | struct btrfs_fs_devices *fs_devices; | |
5803 | int ret; | |
5804 | ||
b367e47f | 5805 | BUG_ON(!mutex_is_locked(&uuid_mutex)); |
2b82032c YZ |
5806 | |
5807 | fs_devices = root->fs_info->fs_devices->seed; | |
5808 | while (fs_devices) { | |
5809 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
5810 | ret = 0; | |
5811 | goto out; | |
5812 | } | |
5813 | fs_devices = fs_devices->seed; | |
5814 | } | |
5815 | ||
5816 | fs_devices = find_fsid(fsid); | |
5817 | if (!fs_devices) { | |
5818 | ret = -ENOENT; | |
5819 | goto out; | |
5820 | } | |
e4404d6e YZ |
5821 | |
5822 | fs_devices = clone_fs_devices(fs_devices); | |
5823 | if (IS_ERR(fs_devices)) { | |
5824 | ret = PTR_ERR(fs_devices); | |
2b82032c YZ |
5825 | goto out; |
5826 | } | |
5827 | ||
97288f2c | 5828 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
15916de8 | 5829 | root->fs_info->bdev_holder); |
48d28232 JL |
5830 | if (ret) { |
5831 | free_fs_devices(fs_devices); | |
2b82032c | 5832 | goto out; |
48d28232 | 5833 | } |
2b82032c YZ |
5834 | |
5835 | if (!fs_devices->seeding) { | |
5836 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 5837 | free_fs_devices(fs_devices); |
2b82032c YZ |
5838 | ret = -EINVAL; |
5839 | goto out; | |
5840 | } | |
5841 | ||
5842 | fs_devices->seed = root->fs_info->fs_devices->seed; | |
5843 | root->fs_info->fs_devices->seed = fs_devices; | |
2b82032c | 5844 | out: |
2b82032c YZ |
5845 | return ret; |
5846 | } | |
5847 | ||
0d81ba5d | 5848 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
5849 | struct extent_buffer *leaf, |
5850 | struct btrfs_dev_item *dev_item) | |
5851 | { | |
5852 | struct btrfs_device *device; | |
5853 | u64 devid; | |
5854 | int ret; | |
2b82032c | 5855 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
5856 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
5857 | ||
0b86a832 | 5858 | devid = btrfs_device_id(leaf, dev_item); |
410ba3a2 | 5859 | read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item), |
a443755f | 5860 | BTRFS_UUID_SIZE); |
1473b24e | 5861 | read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item), |
2b82032c YZ |
5862 | BTRFS_UUID_SIZE); |
5863 | ||
5864 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { | |
5865 | ret = open_seed_devices(root, fs_uuid); | |
e4404d6e | 5866 | if (ret && !btrfs_test_opt(root, DEGRADED)) |
2b82032c | 5867 | return ret; |
2b82032c YZ |
5868 | } |
5869 | ||
aa1b8cd4 | 5870 | device = btrfs_find_device(root->fs_info, devid, dev_uuid, fs_uuid); |
2b82032c | 5871 | if (!device || !device->bdev) { |
e4404d6e | 5872 | if (!btrfs_test_opt(root, DEGRADED)) |
2b82032c YZ |
5873 | return -EIO; |
5874 | ||
5875 | if (!device) { | |
c1c9ff7c | 5876 | btrfs_warn(root->fs_info, "devid %llu missing", devid); |
2b82032c YZ |
5877 | device = add_missing_dev(root, devid, dev_uuid); |
5878 | if (!device) | |
5879 | return -ENOMEM; | |
cd02dca5 CM |
5880 | } else if (!device->missing) { |
5881 | /* | |
5882 | * this happens when a device that was properly setup | |
5883 | * in the device info lists suddenly goes bad. | |
5884 | * device->bdev is NULL, and so we have to set | |
5885 | * device->missing to one here | |
5886 | */ | |
5887 | root->fs_info->fs_devices->missing_devices++; | |
5888 | device->missing = 1; | |
2b82032c YZ |
5889 | } |
5890 | } | |
5891 | ||
5892 | if (device->fs_devices != root->fs_info->fs_devices) { | |
5893 | BUG_ON(device->writeable); | |
5894 | if (device->generation != | |
5895 | btrfs_device_generation(leaf, dev_item)) | |
5896 | return -EINVAL; | |
6324fbf3 | 5897 | } |
0b86a832 CM |
5898 | |
5899 | fill_device_from_item(leaf, dev_item, device); | |
dfe25020 | 5900 | device->in_fs_metadata = 1; |
63a212ab | 5901 | if (device->writeable && !device->is_tgtdev_for_dev_replace) { |
2b82032c | 5902 | device->fs_devices->total_rw_bytes += device->total_bytes; |
2bf64758 JB |
5903 | spin_lock(&root->fs_info->free_chunk_lock); |
5904 | root->fs_info->free_chunk_space += device->total_bytes - | |
5905 | device->bytes_used; | |
5906 | spin_unlock(&root->fs_info->free_chunk_lock); | |
5907 | } | |
0b86a832 | 5908 | ret = 0; |
0b86a832 CM |
5909 | return ret; |
5910 | } | |
5911 | ||
e4404d6e | 5912 | int btrfs_read_sys_array(struct btrfs_root *root) |
0b86a832 | 5913 | { |
6c41761f | 5914 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
a061fc8d | 5915 | struct extent_buffer *sb; |
0b86a832 | 5916 | struct btrfs_disk_key *disk_key; |
0b86a832 | 5917 | struct btrfs_chunk *chunk; |
84eed90f CM |
5918 | u8 *ptr; |
5919 | unsigned long sb_ptr; | |
5920 | int ret = 0; | |
0b86a832 CM |
5921 | u32 num_stripes; |
5922 | u32 array_size; | |
5923 | u32 len = 0; | |
0b86a832 | 5924 | u32 cur; |
84eed90f | 5925 | struct btrfs_key key; |
0b86a832 | 5926 | |
e4404d6e | 5927 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET, |
a061fc8d CM |
5928 | BTRFS_SUPER_INFO_SIZE); |
5929 | if (!sb) | |
5930 | return -ENOMEM; | |
5931 | btrfs_set_buffer_uptodate(sb); | |
85d4e461 | 5932 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0); |
8a334426 DS |
5933 | /* |
5934 | * The sb extent buffer is artifical and just used to read the system array. | |
5935 | * btrfs_set_buffer_uptodate() call does not properly mark all it's | |
5936 | * pages up-to-date when the page is larger: extent does not cover the | |
5937 | * whole page and consequently check_page_uptodate does not find all | |
5938 | * the page's extents up-to-date (the hole beyond sb), | |
5939 | * write_extent_buffer then triggers a WARN_ON. | |
5940 | * | |
5941 | * Regular short extents go through mark_extent_buffer_dirty/writeback cycle, | |
5942 | * but sb spans only this function. Add an explicit SetPageUptodate call | |
5943 | * to silence the warning eg. on PowerPC 64. | |
5944 | */ | |
5945 | if (PAGE_CACHE_SIZE > BTRFS_SUPER_INFO_SIZE) | |
727011e0 | 5946 | SetPageUptodate(sb->pages[0]); |
4008c04a | 5947 | |
a061fc8d | 5948 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
5949 | array_size = btrfs_super_sys_array_size(super_copy); |
5950 | ||
0b86a832 CM |
5951 | ptr = super_copy->sys_chunk_array; |
5952 | sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array); | |
5953 | cur = 0; | |
5954 | ||
5955 | while (cur < array_size) { | |
5956 | disk_key = (struct btrfs_disk_key *)ptr; | |
5957 | btrfs_disk_key_to_cpu(&key, disk_key); | |
5958 | ||
a061fc8d | 5959 | len = sizeof(*disk_key); ptr += len; |
0b86a832 CM |
5960 | sb_ptr += len; |
5961 | cur += len; | |
5962 | ||
0d81ba5d | 5963 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
0b86a832 | 5964 | chunk = (struct btrfs_chunk *)sb_ptr; |
0d81ba5d | 5965 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
5966 | if (ret) |
5967 | break; | |
0b86a832 CM |
5968 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); |
5969 | len = btrfs_chunk_item_size(num_stripes); | |
5970 | } else { | |
84eed90f CM |
5971 | ret = -EIO; |
5972 | break; | |
0b86a832 CM |
5973 | } |
5974 | ptr += len; | |
5975 | sb_ptr += len; | |
5976 | cur += len; | |
5977 | } | |
a061fc8d | 5978 | free_extent_buffer(sb); |
84eed90f | 5979 | return ret; |
0b86a832 CM |
5980 | } |
5981 | ||
5982 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
5983 | { | |
5984 | struct btrfs_path *path; | |
5985 | struct extent_buffer *leaf; | |
5986 | struct btrfs_key key; | |
5987 | struct btrfs_key found_key; | |
5988 | int ret; | |
5989 | int slot; | |
5990 | ||
5991 | root = root->fs_info->chunk_root; | |
5992 | ||
5993 | path = btrfs_alloc_path(); | |
5994 | if (!path) | |
5995 | return -ENOMEM; | |
5996 | ||
b367e47f LZ |
5997 | mutex_lock(&uuid_mutex); |
5998 | lock_chunks(root); | |
5999 | ||
395927a9 FDBM |
6000 | /* |
6001 | * Read all device items, and then all the chunk items. All | |
6002 | * device items are found before any chunk item (their object id | |
6003 | * is smaller than the lowest possible object id for a chunk | |
6004 | * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID). | |
0b86a832 CM |
6005 | */ |
6006 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
6007 | key.offset = 0; | |
6008 | key.type = 0; | |
0b86a832 | 6009 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
ab59381e ZL |
6010 | if (ret < 0) |
6011 | goto error; | |
d397712b | 6012 | while (1) { |
0b86a832 CM |
6013 | leaf = path->nodes[0]; |
6014 | slot = path->slots[0]; | |
6015 | if (slot >= btrfs_header_nritems(leaf)) { | |
6016 | ret = btrfs_next_leaf(root, path); | |
6017 | if (ret == 0) | |
6018 | continue; | |
6019 | if (ret < 0) | |
6020 | goto error; | |
6021 | break; | |
6022 | } | |
6023 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
395927a9 FDBM |
6024 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { |
6025 | struct btrfs_dev_item *dev_item; | |
6026 | dev_item = btrfs_item_ptr(leaf, slot, | |
0b86a832 | 6027 | struct btrfs_dev_item); |
395927a9 FDBM |
6028 | ret = read_one_dev(root, leaf, dev_item); |
6029 | if (ret) | |
6030 | goto error; | |
0b86a832 CM |
6031 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { |
6032 | struct btrfs_chunk *chunk; | |
6033 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
6034 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2b82032c YZ |
6035 | if (ret) |
6036 | goto error; | |
0b86a832 CM |
6037 | } |
6038 | path->slots[0]++; | |
6039 | } | |
0b86a832 CM |
6040 | ret = 0; |
6041 | error: | |
b367e47f LZ |
6042 | unlock_chunks(root); |
6043 | mutex_unlock(&uuid_mutex); | |
6044 | ||
2b82032c | 6045 | btrfs_free_path(path); |
0b86a832 CM |
6046 | return ret; |
6047 | } | |
442a4f63 | 6048 | |
cb517eab MX |
6049 | void btrfs_init_devices_late(struct btrfs_fs_info *fs_info) |
6050 | { | |
6051 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6052 | struct btrfs_device *device; | |
6053 | ||
6054 | mutex_lock(&fs_devices->device_list_mutex); | |
6055 | list_for_each_entry(device, &fs_devices->devices, dev_list) | |
6056 | device->dev_root = fs_info->dev_root; | |
6057 | mutex_unlock(&fs_devices->device_list_mutex); | |
6058 | } | |
6059 | ||
733f4fbb SB |
6060 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev) |
6061 | { | |
6062 | int i; | |
6063 | ||
6064 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6065 | btrfs_dev_stat_reset(dev, i); | |
6066 | } | |
6067 | ||
6068 | int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info) | |
6069 | { | |
6070 | struct btrfs_key key; | |
6071 | struct btrfs_key found_key; | |
6072 | struct btrfs_root *dev_root = fs_info->dev_root; | |
6073 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6074 | struct extent_buffer *eb; | |
6075 | int slot; | |
6076 | int ret = 0; | |
6077 | struct btrfs_device *device; | |
6078 | struct btrfs_path *path = NULL; | |
6079 | int i; | |
6080 | ||
6081 | path = btrfs_alloc_path(); | |
6082 | if (!path) { | |
6083 | ret = -ENOMEM; | |
6084 | goto out; | |
6085 | } | |
6086 | ||
6087 | mutex_lock(&fs_devices->device_list_mutex); | |
6088 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
6089 | int item_size; | |
6090 | struct btrfs_dev_stats_item *ptr; | |
6091 | ||
6092 | key.objectid = 0; | |
6093 | key.type = BTRFS_DEV_STATS_KEY; | |
6094 | key.offset = device->devid; | |
6095 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
6096 | if (ret) { | |
733f4fbb SB |
6097 | __btrfs_reset_dev_stats(device); |
6098 | device->dev_stats_valid = 1; | |
6099 | btrfs_release_path(path); | |
6100 | continue; | |
6101 | } | |
6102 | slot = path->slots[0]; | |
6103 | eb = path->nodes[0]; | |
6104 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
6105 | item_size = btrfs_item_size_nr(eb, slot); | |
6106 | ||
6107 | ptr = btrfs_item_ptr(eb, slot, | |
6108 | struct btrfs_dev_stats_item); | |
6109 | ||
6110 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { | |
6111 | if (item_size >= (1 + i) * sizeof(__le64)) | |
6112 | btrfs_dev_stat_set(device, i, | |
6113 | btrfs_dev_stats_value(eb, ptr, i)); | |
6114 | else | |
6115 | btrfs_dev_stat_reset(device, i); | |
6116 | } | |
6117 | ||
6118 | device->dev_stats_valid = 1; | |
6119 | btrfs_dev_stat_print_on_load(device); | |
6120 | btrfs_release_path(path); | |
6121 | } | |
6122 | mutex_unlock(&fs_devices->device_list_mutex); | |
6123 | ||
6124 | out: | |
6125 | btrfs_free_path(path); | |
6126 | return ret < 0 ? ret : 0; | |
6127 | } | |
6128 | ||
6129 | static int update_dev_stat_item(struct btrfs_trans_handle *trans, | |
6130 | struct btrfs_root *dev_root, | |
6131 | struct btrfs_device *device) | |
6132 | { | |
6133 | struct btrfs_path *path; | |
6134 | struct btrfs_key key; | |
6135 | struct extent_buffer *eb; | |
6136 | struct btrfs_dev_stats_item *ptr; | |
6137 | int ret; | |
6138 | int i; | |
6139 | ||
6140 | key.objectid = 0; | |
6141 | key.type = BTRFS_DEV_STATS_KEY; | |
6142 | key.offset = device->devid; | |
6143 | ||
6144 | path = btrfs_alloc_path(); | |
6145 | BUG_ON(!path); | |
6146 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
6147 | if (ret < 0) { | |
efe120a0 FH |
6148 | printk_in_rcu(KERN_WARNING "BTRFS: " |
6149 | "error %d while searching for dev_stats item for device %s!\n", | |
606686ee | 6150 | ret, rcu_str_deref(device->name)); |
733f4fbb SB |
6151 | goto out; |
6152 | } | |
6153 | ||
6154 | if (ret == 0 && | |
6155 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
6156 | /* need to delete old one and insert a new one */ | |
6157 | ret = btrfs_del_item(trans, dev_root, path); | |
6158 | if (ret != 0) { | |
efe120a0 FH |
6159 | printk_in_rcu(KERN_WARNING "BTRFS: " |
6160 | "delete too small dev_stats item for device %s failed %d!\n", | |
606686ee | 6161 | rcu_str_deref(device->name), ret); |
733f4fbb SB |
6162 | goto out; |
6163 | } | |
6164 | ret = 1; | |
6165 | } | |
6166 | ||
6167 | if (ret == 1) { | |
6168 | /* need to insert a new item */ | |
6169 | btrfs_release_path(path); | |
6170 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
6171 | &key, sizeof(*ptr)); | |
6172 | if (ret < 0) { | |
efe120a0 FH |
6173 | printk_in_rcu(KERN_WARNING "BTRFS: " |
6174 | "insert dev_stats item for device %s failed %d!\n", | |
606686ee | 6175 | rcu_str_deref(device->name), ret); |
733f4fbb SB |
6176 | goto out; |
6177 | } | |
6178 | } | |
6179 | ||
6180 | eb = path->nodes[0]; | |
6181 | ptr = btrfs_item_ptr(eb, path->slots[0], struct btrfs_dev_stats_item); | |
6182 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6183 | btrfs_set_dev_stats_value(eb, ptr, i, | |
6184 | btrfs_dev_stat_read(device, i)); | |
6185 | btrfs_mark_buffer_dirty(eb); | |
6186 | ||
6187 | out: | |
6188 | btrfs_free_path(path); | |
6189 | return ret; | |
6190 | } | |
6191 | ||
6192 | /* | |
6193 | * called from commit_transaction. Writes all changed device stats to disk. | |
6194 | */ | |
6195 | int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, | |
6196 | struct btrfs_fs_info *fs_info) | |
6197 | { | |
6198 | struct btrfs_root *dev_root = fs_info->dev_root; | |
6199 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6200 | struct btrfs_device *device; | |
6201 | int ret = 0; | |
6202 | ||
6203 | mutex_lock(&fs_devices->device_list_mutex); | |
6204 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
6205 | if (!device->dev_stats_valid || !device->dev_stats_dirty) | |
6206 | continue; | |
6207 | ||
6208 | ret = update_dev_stat_item(trans, dev_root, device); | |
6209 | if (!ret) | |
6210 | device->dev_stats_dirty = 0; | |
6211 | } | |
6212 | mutex_unlock(&fs_devices->device_list_mutex); | |
6213 | ||
6214 | return ret; | |
6215 | } | |
6216 | ||
442a4f63 SB |
6217 | void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index) |
6218 | { | |
6219 | btrfs_dev_stat_inc(dev, index); | |
6220 | btrfs_dev_stat_print_on_error(dev); | |
6221 | } | |
6222 | ||
48a3b636 | 6223 | static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev) |
442a4f63 | 6224 | { |
733f4fbb SB |
6225 | if (!dev->dev_stats_valid) |
6226 | return; | |
efe120a0 FH |
6227 | printk_ratelimited_in_rcu(KERN_ERR "BTRFS: " |
6228 | "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n", | |
606686ee | 6229 | rcu_str_deref(dev->name), |
442a4f63 SB |
6230 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
6231 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
6232 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
efe120a0 FH |
6233 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS), |
6234 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
442a4f63 | 6235 | } |
c11d2c23 | 6236 | |
733f4fbb SB |
6237 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev) |
6238 | { | |
a98cdb85 SB |
6239 | int i; |
6240 | ||
6241 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6242 | if (btrfs_dev_stat_read(dev, i) != 0) | |
6243 | break; | |
6244 | if (i == BTRFS_DEV_STAT_VALUES_MAX) | |
6245 | return; /* all values == 0, suppress message */ | |
6246 | ||
efe120a0 FH |
6247 | printk_in_rcu(KERN_INFO "BTRFS: " |
6248 | "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n", | |
606686ee | 6249 | rcu_str_deref(dev->name), |
733f4fbb SB |
6250 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
6251 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
6252 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
6253 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS), | |
6254 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
6255 | } | |
6256 | ||
c11d2c23 | 6257 | int btrfs_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 6258 | struct btrfs_ioctl_get_dev_stats *stats) |
c11d2c23 SB |
6259 | { |
6260 | struct btrfs_device *dev; | |
6261 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
6262 | int i; | |
6263 | ||
6264 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 6265 | dev = btrfs_find_device(root->fs_info, stats->devid, NULL, NULL); |
c11d2c23 SB |
6266 | mutex_unlock(&fs_devices->device_list_mutex); |
6267 | ||
6268 | if (!dev) { | |
efe120a0 | 6269 | btrfs_warn(root->fs_info, "get dev_stats failed, device not found"); |
c11d2c23 | 6270 | return -ENODEV; |
733f4fbb | 6271 | } else if (!dev->dev_stats_valid) { |
efe120a0 | 6272 | btrfs_warn(root->fs_info, "get dev_stats failed, not yet valid"); |
733f4fbb | 6273 | return -ENODEV; |
b27f7c0c | 6274 | } else if (stats->flags & BTRFS_DEV_STATS_RESET) { |
c11d2c23 SB |
6275 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { |
6276 | if (stats->nr_items > i) | |
6277 | stats->values[i] = | |
6278 | btrfs_dev_stat_read_and_reset(dev, i); | |
6279 | else | |
6280 | btrfs_dev_stat_reset(dev, i); | |
6281 | } | |
6282 | } else { | |
6283 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6284 | if (stats->nr_items > i) | |
6285 | stats->values[i] = btrfs_dev_stat_read(dev, i); | |
6286 | } | |
6287 | if (stats->nr_items > BTRFS_DEV_STAT_VALUES_MAX) | |
6288 | stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX; | |
6289 | return 0; | |
6290 | } | |
a8a6dab7 SB |
6291 | |
6292 | int btrfs_scratch_superblock(struct btrfs_device *device) | |
6293 | { | |
6294 | struct buffer_head *bh; | |
6295 | struct btrfs_super_block *disk_super; | |
6296 | ||
6297 | bh = btrfs_read_dev_super(device->bdev); | |
6298 | if (!bh) | |
6299 | return -EINVAL; | |
6300 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
6301 | ||
6302 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
6303 | set_buffer_dirty(bh); | |
6304 | sync_dirty_buffer(bh); | |
6305 | brelse(bh); | |
6306 | ||
6307 | return 0; | |
6308 | } |