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0b86a832 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | #include <linux/sched.h> | |
19 | #include <linux/bio.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
8a4b83cc | 21 | #include <linux/buffer_head.h> |
f2d8d74d | 22 | #include <linux/blkdev.h> |
788f20eb | 23 | #include <linux/random.h> |
b765ead5 | 24 | #include <linux/iocontext.h> |
6f88a440 | 25 | #include <linux/capability.h> |
442a4f63 | 26 | #include <linux/ratelimit.h> |
59641015 | 27 | #include <linux/kthread.h> |
53b381b3 | 28 | #include <linux/raid/pq.h> |
803b2f54 | 29 | #include <linux/semaphore.h> |
53b381b3 | 30 | #include <asm/div64.h> |
0b86a832 CM |
31 | #include "ctree.h" |
32 | #include "extent_map.h" | |
33 | #include "disk-io.h" | |
34 | #include "transaction.h" | |
35 | #include "print-tree.h" | |
36 | #include "volumes.h" | |
53b381b3 | 37 | #include "raid56.h" |
8b712842 | 38 | #include "async-thread.h" |
21adbd5c | 39 | #include "check-integrity.h" |
606686ee | 40 | #include "rcu-string.h" |
3fed40cc | 41 | #include "math.h" |
8dabb742 | 42 | #include "dev-replace.h" |
99994cde | 43 | #include "sysfs.h" |
0b86a832 | 44 | |
2b82032c YZ |
45 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
46 | struct btrfs_root *root, | |
47 | struct btrfs_device *device); | |
48 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); | |
733f4fbb | 49 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev); |
48a3b636 | 50 | static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev); |
733f4fbb | 51 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *device); |
2b82032c | 52 | |
67a2c45e | 53 | DEFINE_MUTEX(uuid_mutex); |
8a4b83cc CM |
54 | static LIST_HEAD(fs_uuids); |
55 | ||
2208a378 ID |
56 | static struct btrfs_fs_devices *__alloc_fs_devices(void) |
57 | { | |
58 | struct btrfs_fs_devices *fs_devs; | |
59 | ||
60 | fs_devs = kzalloc(sizeof(*fs_devs), GFP_NOFS); | |
61 | if (!fs_devs) | |
62 | return ERR_PTR(-ENOMEM); | |
63 | ||
64 | mutex_init(&fs_devs->device_list_mutex); | |
65 | ||
66 | INIT_LIST_HEAD(&fs_devs->devices); | |
935e5cc9 | 67 | INIT_LIST_HEAD(&fs_devs->resized_devices); |
2208a378 ID |
68 | INIT_LIST_HEAD(&fs_devs->alloc_list); |
69 | INIT_LIST_HEAD(&fs_devs->list); | |
70 | ||
71 | return fs_devs; | |
72 | } | |
73 | ||
74 | /** | |
75 | * alloc_fs_devices - allocate struct btrfs_fs_devices | |
76 | * @fsid: a pointer to UUID for this FS. If NULL a new UUID is | |
77 | * generated. | |
78 | * | |
79 | * Return: a pointer to a new &struct btrfs_fs_devices on success; | |
80 | * ERR_PTR() on error. Returned struct is not linked onto any lists and | |
81 | * can be destroyed with kfree() right away. | |
82 | */ | |
83 | static struct btrfs_fs_devices *alloc_fs_devices(const u8 *fsid) | |
84 | { | |
85 | struct btrfs_fs_devices *fs_devs; | |
86 | ||
87 | fs_devs = __alloc_fs_devices(); | |
88 | if (IS_ERR(fs_devs)) | |
89 | return fs_devs; | |
90 | ||
91 | if (fsid) | |
92 | memcpy(fs_devs->fsid, fsid, BTRFS_FSID_SIZE); | |
93 | else | |
94 | generate_random_uuid(fs_devs->fsid); | |
95 | ||
96 | return fs_devs; | |
97 | } | |
98 | ||
e4404d6e YZ |
99 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
100 | { | |
101 | struct btrfs_device *device; | |
102 | WARN_ON(fs_devices->opened); | |
103 | while (!list_empty(&fs_devices->devices)) { | |
104 | device = list_entry(fs_devices->devices.next, | |
105 | struct btrfs_device, dev_list); | |
106 | list_del(&device->dev_list); | |
606686ee | 107 | rcu_string_free(device->name); |
e4404d6e YZ |
108 | kfree(device); |
109 | } | |
110 | kfree(fs_devices); | |
111 | } | |
112 | ||
b8b8ff59 LC |
113 | static void btrfs_kobject_uevent(struct block_device *bdev, |
114 | enum kobject_action action) | |
115 | { | |
116 | int ret; | |
117 | ||
118 | ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); | |
119 | if (ret) | |
efe120a0 | 120 | pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", |
b8b8ff59 LC |
121 | action, |
122 | kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), | |
123 | &disk_to_dev(bdev->bd_disk)->kobj); | |
124 | } | |
125 | ||
143bede5 | 126 | void btrfs_cleanup_fs_uuids(void) |
8a4b83cc CM |
127 | { |
128 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 129 | |
2b82032c YZ |
130 | while (!list_empty(&fs_uuids)) { |
131 | fs_devices = list_entry(fs_uuids.next, | |
132 | struct btrfs_fs_devices, list); | |
133 | list_del(&fs_devices->list); | |
e4404d6e | 134 | free_fs_devices(fs_devices); |
8a4b83cc | 135 | } |
8a4b83cc CM |
136 | } |
137 | ||
12bd2fc0 ID |
138 | static struct btrfs_device *__alloc_device(void) |
139 | { | |
140 | struct btrfs_device *dev; | |
141 | ||
142 | dev = kzalloc(sizeof(*dev), GFP_NOFS); | |
143 | if (!dev) | |
144 | return ERR_PTR(-ENOMEM); | |
145 | ||
146 | INIT_LIST_HEAD(&dev->dev_list); | |
147 | INIT_LIST_HEAD(&dev->dev_alloc_list); | |
935e5cc9 | 148 | INIT_LIST_HEAD(&dev->resized_list); |
12bd2fc0 ID |
149 | |
150 | spin_lock_init(&dev->io_lock); | |
151 | ||
152 | spin_lock_init(&dev->reada_lock); | |
153 | atomic_set(&dev->reada_in_flight, 0); | |
addc3fa7 | 154 | atomic_set(&dev->dev_stats_ccnt, 0); |
12bd2fc0 ID |
155 | INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_WAIT); |
156 | INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_WAIT); | |
157 | ||
158 | return dev; | |
159 | } | |
160 | ||
a1b32a59 CM |
161 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
162 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
163 | { |
164 | struct btrfs_device *dev; | |
8a4b83cc | 165 | |
c6e30871 | 166 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 167 | if (dev->devid == devid && |
8f18cf13 | 168 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 169 | return dev; |
a443755f | 170 | } |
8a4b83cc CM |
171 | } |
172 | return NULL; | |
173 | } | |
174 | ||
a1b32a59 | 175 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 176 | { |
8a4b83cc CM |
177 | struct btrfs_fs_devices *fs_devices; |
178 | ||
c6e30871 | 179 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
180 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
181 | return fs_devices; | |
182 | } | |
183 | return NULL; | |
184 | } | |
185 | ||
beaf8ab3 SB |
186 | static int |
187 | btrfs_get_bdev_and_sb(const char *device_path, fmode_t flags, void *holder, | |
188 | int flush, struct block_device **bdev, | |
189 | struct buffer_head **bh) | |
190 | { | |
191 | int ret; | |
192 | ||
193 | *bdev = blkdev_get_by_path(device_path, flags, holder); | |
194 | ||
195 | if (IS_ERR(*bdev)) { | |
196 | ret = PTR_ERR(*bdev); | |
efe120a0 | 197 | printk(KERN_INFO "BTRFS: open %s failed\n", device_path); |
beaf8ab3 SB |
198 | goto error; |
199 | } | |
200 | ||
201 | if (flush) | |
202 | filemap_write_and_wait((*bdev)->bd_inode->i_mapping); | |
203 | ret = set_blocksize(*bdev, 4096); | |
204 | if (ret) { | |
205 | blkdev_put(*bdev, flags); | |
206 | goto error; | |
207 | } | |
208 | invalidate_bdev(*bdev); | |
209 | *bh = btrfs_read_dev_super(*bdev); | |
210 | if (!*bh) { | |
211 | ret = -EINVAL; | |
212 | blkdev_put(*bdev, flags); | |
213 | goto error; | |
214 | } | |
215 | ||
216 | return 0; | |
217 | ||
218 | error: | |
219 | *bdev = NULL; | |
220 | *bh = NULL; | |
221 | return ret; | |
222 | } | |
223 | ||
ffbd517d CM |
224 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
225 | struct bio *head, struct bio *tail) | |
226 | { | |
227 | ||
228 | struct bio *old_head; | |
229 | ||
230 | old_head = pending_bios->head; | |
231 | pending_bios->head = head; | |
232 | if (pending_bios->tail) | |
233 | tail->bi_next = old_head; | |
234 | else | |
235 | pending_bios->tail = tail; | |
236 | } | |
237 | ||
8b712842 CM |
238 | /* |
239 | * we try to collect pending bios for a device so we don't get a large | |
240 | * number of procs sending bios down to the same device. This greatly | |
241 | * improves the schedulers ability to collect and merge the bios. | |
242 | * | |
243 | * But, it also turns into a long list of bios to process and that is sure | |
244 | * to eventually make the worker thread block. The solution here is to | |
245 | * make some progress and then put this work struct back at the end of | |
246 | * the list if the block device is congested. This way, multiple devices | |
247 | * can make progress from a single worker thread. | |
248 | */ | |
143bede5 | 249 | static noinline void run_scheduled_bios(struct btrfs_device *device) |
8b712842 CM |
250 | { |
251 | struct bio *pending; | |
252 | struct backing_dev_info *bdi; | |
b64a2851 | 253 | struct btrfs_fs_info *fs_info; |
ffbd517d | 254 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
255 | struct bio *tail; |
256 | struct bio *cur; | |
257 | int again = 0; | |
ffbd517d | 258 | unsigned long num_run; |
d644d8a1 | 259 | unsigned long batch_run = 0; |
b64a2851 | 260 | unsigned long limit; |
b765ead5 | 261 | unsigned long last_waited = 0; |
d84275c9 | 262 | int force_reg = 0; |
0e588859 | 263 | int sync_pending = 0; |
211588ad CM |
264 | struct blk_plug plug; |
265 | ||
266 | /* | |
267 | * this function runs all the bios we've collected for | |
268 | * a particular device. We don't want to wander off to | |
269 | * another device without first sending all of these down. | |
270 | * So, setup a plug here and finish it off before we return | |
271 | */ | |
272 | blk_start_plug(&plug); | |
8b712842 | 273 | |
bedf762b | 274 | bdi = blk_get_backing_dev_info(device->bdev); |
b64a2851 CM |
275 | fs_info = device->dev_root->fs_info; |
276 | limit = btrfs_async_submit_limit(fs_info); | |
277 | limit = limit * 2 / 3; | |
278 | ||
8b712842 CM |
279 | loop: |
280 | spin_lock(&device->io_lock); | |
281 | ||
a6837051 | 282 | loop_lock: |
d84275c9 | 283 | num_run = 0; |
ffbd517d | 284 | |
8b712842 CM |
285 | /* take all the bios off the list at once and process them |
286 | * later on (without the lock held). But, remember the | |
287 | * tail and other pointers so the bios can be properly reinserted | |
288 | * into the list if we hit congestion | |
289 | */ | |
d84275c9 | 290 | if (!force_reg && device->pending_sync_bios.head) { |
ffbd517d | 291 | pending_bios = &device->pending_sync_bios; |
d84275c9 CM |
292 | force_reg = 1; |
293 | } else { | |
ffbd517d | 294 | pending_bios = &device->pending_bios; |
d84275c9 CM |
295 | force_reg = 0; |
296 | } | |
ffbd517d CM |
297 | |
298 | pending = pending_bios->head; | |
299 | tail = pending_bios->tail; | |
8b712842 | 300 | WARN_ON(pending && !tail); |
8b712842 CM |
301 | |
302 | /* | |
303 | * if pending was null this time around, no bios need processing | |
304 | * at all and we can stop. Otherwise it'll loop back up again | |
305 | * and do an additional check so no bios are missed. | |
306 | * | |
307 | * device->running_pending is used to synchronize with the | |
308 | * schedule_bio code. | |
309 | */ | |
ffbd517d CM |
310 | if (device->pending_sync_bios.head == NULL && |
311 | device->pending_bios.head == NULL) { | |
8b712842 CM |
312 | again = 0; |
313 | device->running_pending = 0; | |
ffbd517d CM |
314 | } else { |
315 | again = 1; | |
316 | device->running_pending = 1; | |
8b712842 | 317 | } |
ffbd517d CM |
318 | |
319 | pending_bios->head = NULL; | |
320 | pending_bios->tail = NULL; | |
321 | ||
8b712842 CM |
322 | spin_unlock(&device->io_lock); |
323 | ||
d397712b | 324 | while (pending) { |
ffbd517d CM |
325 | |
326 | rmb(); | |
d84275c9 CM |
327 | /* we want to work on both lists, but do more bios on the |
328 | * sync list than the regular list | |
329 | */ | |
330 | if ((num_run > 32 && | |
331 | pending_bios != &device->pending_sync_bios && | |
332 | device->pending_sync_bios.head) || | |
333 | (num_run > 64 && pending_bios == &device->pending_sync_bios && | |
334 | device->pending_bios.head)) { | |
ffbd517d CM |
335 | spin_lock(&device->io_lock); |
336 | requeue_list(pending_bios, pending, tail); | |
337 | goto loop_lock; | |
338 | } | |
339 | ||
8b712842 CM |
340 | cur = pending; |
341 | pending = pending->bi_next; | |
342 | cur->bi_next = NULL; | |
b64a2851 | 343 | |
66657b31 | 344 | if (atomic_dec_return(&fs_info->nr_async_bios) < limit && |
b64a2851 CM |
345 | waitqueue_active(&fs_info->async_submit_wait)) |
346 | wake_up(&fs_info->async_submit_wait); | |
492bb6de CM |
347 | |
348 | BUG_ON(atomic_read(&cur->bi_cnt) == 0); | |
d644d8a1 | 349 | |
2ab1ba68 CM |
350 | /* |
351 | * if we're doing the sync list, record that our | |
352 | * plug has some sync requests on it | |
353 | * | |
354 | * If we're doing the regular list and there are | |
355 | * sync requests sitting around, unplug before | |
356 | * we add more | |
357 | */ | |
358 | if (pending_bios == &device->pending_sync_bios) { | |
359 | sync_pending = 1; | |
360 | } else if (sync_pending) { | |
361 | blk_finish_plug(&plug); | |
362 | blk_start_plug(&plug); | |
363 | sync_pending = 0; | |
364 | } | |
365 | ||
21adbd5c | 366 | btrfsic_submit_bio(cur->bi_rw, cur); |
5ff7ba3a CM |
367 | num_run++; |
368 | batch_run++; | |
7eaceacc | 369 | if (need_resched()) |
ffbd517d | 370 | cond_resched(); |
8b712842 CM |
371 | |
372 | /* | |
373 | * we made progress, there is more work to do and the bdi | |
374 | * is now congested. Back off and let other work structs | |
375 | * run instead | |
376 | */ | |
57fd5a5f | 377 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
5f2cc086 | 378 | fs_info->fs_devices->open_devices > 1) { |
b765ead5 | 379 | struct io_context *ioc; |
8b712842 | 380 | |
b765ead5 CM |
381 | ioc = current->io_context; |
382 | ||
383 | /* | |
384 | * the main goal here is that we don't want to | |
385 | * block if we're going to be able to submit | |
386 | * more requests without blocking. | |
387 | * | |
388 | * This code does two great things, it pokes into | |
389 | * the elevator code from a filesystem _and_ | |
390 | * it makes assumptions about how batching works. | |
391 | */ | |
392 | if (ioc && ioc->nr_batch_requests > 0 && | |
393 | time_before(jiffies, ioc->last_waited + HZ/50UL) && | |
394 | (last_waited == 0 || | |
395 | ioc->last_waited == last_waited)) { | |
396 | /* | |
397 | * we want to go through our batch of | |
398 | * requests and stop. So, we copy out | |
399 | * the ioc->last_waited time and test | |
400 | * against it before looping | |
401 | */ | |
402 | last_waited = ioc->last_waited; | |
7eaceacc | 403 | if (need_resched()) |
ffbd517d | 404 | cond_resched(); |
b765ead5 CM |
405 | continue; |
406 | } | |
8b712842 | 407 | spin_lock(&device->io_lock); |
ffbd517d | 408 | requeue_list(pending_bios, pending, tail); |
a6837051 | 409 | device->running_pending = 1; |
8b712842 CM |
410 | |
411 | spin_unlock(&device->io_lock); | |
a8c93d4e QW |
412 | btrfs_queue_work(fs_info->submit_workers, |
413 | &device->work); | |
8b712842 CM |
414 | goto done; |
415 | } | |
d85c8a6f CM |
416 | /* unplug every 64 requests just for good measure */ |
417 | if (batch_run % 64 == 0) { | |
418 | blk_finish_plug(&plug); | |
419 | blk_start_plug(&plug); | |
420 | sync_pending = 0; | |
421 | } | |
8b712842 | 422 | } |
ffbd517d | 423 | |
51684082 CM |
424 | cond_resched(); |
425 | if (again) | |
426 | goto loop; | |
427 | ||
428 | spin_lock(&device->io_lock); | |
429 | if (device->pending_bios.head || device->pending_sync_bios.head) | |
430 | goto loop_lock; | |
431 | spin_unlock(&device->io_lock); | |
432 | ||
8b712842 | 433 | done: |
211588ad | 434 | blk_finish_plug(&plug); |
8b712842 CM |
435 | } |
436 | ||
b2950863 | 437 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
438 | { |
439 | struct btrfs_device *device; | |
440 | ||
441 | device = container_of(work, struct btrfs_device, work); | |
442 | run_scheduled_bios(device); | |
443 | } | |
444 | ||
60999ca4 DS |
445 | /* |
446 | * Add new device to list of registered devices | |
447 | * | |
448 | * Returns: | |
449 | * 1 - first time device is seen | |
450 | * 0 - device already known | |
451 | * < 0 - error | |
452 | */ | |
a1b32a59 | 453 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
454 | struct btrfs_super_block *disk_super, |
455 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
456 | { | |
457 | struct btrfs_device *device; | |
458 | struct btrfs_fs_devices *fs_devices; | |
606686ee | 459 | struct rcu_string *name; |
60999ca4 | 460 | int ret = 0; |
8a4b83cc CM |
461 | u64 found_transid = btrfs_super_generation(disk_super); |
462 | ||
463 | fs_devices = find_fsid(disk_super->fsid); | |
464 | if (!fs_devices) { | |
2208a378 ID |
465 | fs_devices = alloc_fs_devices(disk_super->fsid); |
466 | if (IS_ERR(fs_devices)) | |
467 | return PTR_ERR(fs_devices); | |
468 | ||
8a4b83cc | 469 | list_add(&fs_devices->list, &fs_uuids); |
2208a378 | 470 | |
8a4b83cc CM |
471 | device = NULL; |
472 | } else { | |
a443755f CM |
473 | device = __find_device(&fs_devices->devices, devid, |
474 | disk_super->dev_item.uuid); | |
8a4b83cc | 475 | } |
443f24fe | 476 | |
8a4b83cc | 477 | if (!device) { |
2b82032c YZ |
478 | if (fs_devices->opened) |
479 | return -EBUSY; | |
480 | ||
12bd2fc0 ID |
481 | device = btrfs_alloc_device(NULL, &devid, |
482 | disk_super->dev_item.uuid); | |
483 | if (IS_ERR(device)) { | |
8a4b83cc | 484 | /* we can safely leave the fs_devices entry around */ |
12bd2fc0 | 485 | return PTR_ERR(device); |
8a4b83cc | 486 | } |
606686ee JB |
487 | |
488 | name = rcu_string_strdup(path, GFP_NOFS); | |
489 | if (!name) { | |
8a4b83cc CM |
490 | kfree(device); |
491 | return -ENOMEM; | |
492 | } | |
606686ee | 493 | rcu_assign_pointer(device->name, name); |
90519d66 | 494 | |
e5e9a520 | 495 | mutex_lock(&fs_devices->device_list_mutex); |
1f78160c | 496 | list_add_rcu(&device->dev_list, &fs_devices->devices); |
f7171750 | 497 | fs_devices->num_devices++; |
e5e9a520 CM |
498 | mutex_unlock(&fs_devices->device_list_mutex); |
499 | ||
60999ca4 | 500 | ret = 1; |
2b82032c | 501 | device->fs_devices = fs_devices; |
606686ee | 502 | } else if (!device->name || strcmp(device->name->str, path)) { |
b96de000 AJ |
503 | /* |
504 | * When FS is already mounted. | |
505 | * 1. If you are here and if the device->name is NULL that | |
506 | * means this device was missing at time of FS mount. | |
507 | * 2. If you are here and if the device->name is different | |
508 | * from 'path' that means either | |
509 | * a. The same device disappeared and reappeared with | |
510 | * different name. or | |
511 | * b. The missing-disk-which-was-replaced, has | |
512 | * reappeared now. | |
513 | * | |
514 | * We must allow 1 and 2a above. But 2b would be a spurious | |
515 | * and unintentional. | |
516 | * | |
517 | * Further in case of 1 and 2a above, the disk at 'path' | |
518 | * would have missed some transaction when it was away and | |
519 | * in case of 2a the stale bdev has to be updated as well. | |
520 | * 2b must not be allowed at all time. | |
521 | */ | |
522 | ||
523 | /* | |
0f23ae74 CM |
524 | * For now, we do allow update to btrfs_fs_device through the |
525 | * btrfs dev scan cli after FS has been mounted. We're still | |
526 | * tracking a problem where systems fail mount by subvolume id | |
527 | * when we reject replacement on a mounted FS. | |
b96de000 | 528 | */ |
0f23ae74 | 529 | if (!fs_devices->opened && found_transid < device->generation) { |
77bdae4d AJ |
530 | /* |
531 | * That is if the FS is _not_ mounted and if you | |
532 | * are here, that means there is more than one | |
533 | * disk with same uuid and devid.We keep the one | |
534 | * with larger generation number or the last-in if | |
535 | * generation are equal. | |
536 | */ | |
0f23ae74 | 537 | return -EEXIST; |
77bdae4d | 538 | } |
b96de000 | 539 | |
606686ee | 540 | name = rcu_string_strdup(path, GFP_NOFS); |
3a0524dc TH |
541 | if (!name) |
542 | return -ENOMEM; | |
606686ee JB |
543 | rcu_string_free(device->name); |
544 | rcu_assign_pointer(device->name, name); | |
cd02dca5 CM |
545 | if (device->missing) { |
546 | fs_devices->missing_devices--; | |
547 | device->missing = 0; | |
548 | } | |
8a4b83cc CM |
549 | } |
550 | ||
77bdae4d AJ |
551 | /* |
552 | * Unmount does not free the btrfs_device struct but would zero | |
553 | * generation along with most of the other members. So just update | |
554 | * it back. We need it to pick the disk with largest generation | |
555 | * (as above). | |
556 | */ | |
557 | if (!fs_devices->opened) | |
558 | device->generation = found_transid; | |
559 | ||
8a4b83cc | 560 | *fs_devices_ret = fs_devices; |
60999ca4 DS |
561 | |
562 | return ret; | |
8a4b83cc CM |
563 | } |
564 | ||
e4404d6e YZ |
565 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
566 | { | |
567 | struct btrfs_fs_devices *fs_devices; | |
568 | struct btrfs_device *device; | |
569 | struct btrfs_device *orig_dev; | |
570 | ||
2208a378 ID |
571 | fs_devices = alloc_fs_devices(orig->fsid); |
572 | if (IS_ERR(fs_devices)) | |
573 | return fs_devices; | |
e4404d6e | 574 | |
adbbb863 | 575 | mutex_lock(&orig->device_list_mutex); |
02db0844 | 576 | fs_devices->total_devices = orig->total_devices; |
e4404d6e | 577 | |
46224705 | 578 | /* We have held the volume lock, it is safe to get the devices. */ |
e4404d6e | 579 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
606686ee JB |
580 | struct rcu_string *name; |
581 | ||
12bd2fc0 ID |
582 | device = btrfs_alloc_device(NULL, &orig_dev->devid, |
583 | orig_dev->uuid); | |
584 | if (IS_ERR(device)) | |
e4404d6e YZ |
585 | goto error; |
586 | ||
606686ee JB |
587 | /* |
588 | * This is ok to do without rcu read locked because we hold the | |
589 | * uuid mutex so nothing we touch in here is going to disappear. | |
590 | */ | |
e755f780 AJ |
591 | if (orig_dev->name) { |
592 | name = rcu_string_strdup(orig_dev->name->str, GFP_NOFS); | |
593 | if (!name) { | |
594 | kfree(device); | |
595 | goto error; | |
596 | } | |
597 | rcu_assign_pointer(device->name, name); | |
fd2696f3 | 598 | } |
e4404d6e | 599 | |
e4404d6e YZ |
600 | list_add(&device->dev_list, &fs_devices->devices); |
601 | device->fs_devices = fs_devices; | |
602 | fs_devices->num_devices++; | |
603 | } | |
adbbb863 | 604 | mutex_unlock(&orig->device_list_mutex); |
e4404d6e YZ |
605 | return fs_devices; |
606 | error: | |
adbbb863 | 607 | mutex_unlock(&orig->device_list_mutex); |
e4404d6e YZ |
608 | free_fs_devices(fs_devices); |
609 | return ERR_PTR(-ENOMEM); | |
610 | } | |
611 | ||
8dabb742 SB |
612 | void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info, |
613 | struct btrfs_fs_devices *fs_devices, int step) | |
dfe25020 | 614 | { |
c6e30871 | 615 | struct btrfs_device *device, *next; |
443f24fe | 616 | struct btrfs_device *latest_dev = NULL; |
a6b0d5c8 | 617 | |
dfe25020 CM |
618 | mutex_lock(&uuid_mutex); |
619 | again: | |
46224705 | 620 | /* This is the initialized path, it is safe to release the devices. */ |
c6e30871 | 621 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
a6b0d5c8 | 622 | if (device->in_fs_metadata) { |
63a212ab | 623 | if (!device->is_tgtdev_for_dev_replace && |
443f24fe MX |
624 | (!latest_dev || |
625 | device->generation > latest_dev->generation)) { | |
626 | latest_dev = device; | |
a6b0d5c8 | 627 | } |
2b82032c | 628 | continue; |
a6b0d5c8 | 629 | } |
2b82032c | 630 | |
8dabb742 SB |
631 | if (device->devid == BTRFS_DEV_REPLACE_DEVID) { |
632 | /* | |
633 | * In the first step, keep the device which has | |
634 | * the correct fsid and the devid that is used | |
635 | * for the dev_replace procedure. | |
636 | * In the second step, the dev_replace state is | |
637 | * read from the device tree and it is known | |
638 | * whether the procedure is really active or | |
639 | * not, which means whether this device is | |
640 | * used or whether it should be removed. | |
641 | */ | |
642 | if (step == 0 || device->is_tgtdev_for_dev_replace) { | |
643 | continue; | |
644 | } | |
645 | } | |
2b82032c | 646 | if (device->bdev) { |
d4d77629 | 647 | blkdev_put(device->bdev, device->mode); |
2b82032c YZ |
648 | device->bdev = NULL; |
649 | fs_devices->open_devices--; | |
650 | } | |
651 | if (device->writeable) { | |
652 | list_del_init(&device->dev_alloc_list); | |
653 | device->writeable = 0; | |
8dabb742 SB |
654 | if (!device->is_tgtdev_for_dev_replace) |
655 | fs_devices->rw_devices--; | |
2b82032c | 656 | } |
e4404d6e YZ |
657 | list_del_init(&device->dev_list); |
658 | fs_devices->num_devices--; | |
606686ee | 659 | rcu_string_free(device->name); |
e4404d6e | 660 | kfree(device); |
dfe25020 | 661 | } |
2b82032c YZ |
662 | |
663 | if (fs_devices->seed) { | |
664 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
665 | goto again; |
666 | } | |
667 | ||
443f24fe | 668 | fs_devices->latest_bdev = latest_dev->bdev; |
a6b0d5c8 | 669 | |
dfe25020 | 670 | mutex_unlock(&uuid_mutex); |
dfe25020 | 671 | } |
a0af469b | 672 | |
1f78160c XG |
673 | static void __free_device(struct work_struct *work) |
674 | { | |
675 | struct btrfs_device *device; | |
676 | ||
677 | device = container_of(work, struct btrfs_device, rcu_work); | |
678 | ||
679 | if (device->bdev) | |
680 | blkdev_put(device->bdev, device->mode); | |
681 | ||
606686ee | 682 | rcu_string_free(device->name); |
1f78160c XG |
683 | kfree(device); |
684 | } | |
685 | ||
686 | static void free_device(struct rcu_head *head) | |
687 | { | |
688 | struct btrfs_device *device; | |
689 | ||
690 | device = container_of(head, struct btrfs_device, rcu); | |
691 | ||
692 | INIT_WORK(&device->rcu_work, __free_device); | |
693 | schedule_work(&device->rcu_work); | |
694 | } | |
695 | ||
2b82032c | 696 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 697 | { |
8a4b83cc | 698 | struct btrfs_device *device; |
e4404d6e | 699 | |
2b82032c YZ |
700 | if (--fs_devices->opened > 0) |
701 | return 0; | |
8a4b83cc | 702 | |
c9513edb | 703 | mutex_lock(&fs_devices->device_list_mutex); |
c6e30871 | 704 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
1f78160c | 705 | struct btrfs_device *new_device; |
606686ee | 706 | struct rcu_string *name; |
1f78160c XG |
707 | |
708 | if (device->bdev) | |
a0af469b | 709 | fs_devices->open_devices--; |
1f78160c | 710 | |
f747cab7 ID |
711 | if (device->writeable && |
712 | device->devid != BTRFS_DEV_REPLACE_DEVID) { | |
2b82032c YZ |
713 | list_del_init(&device->dev_alloc_list); |
714 | fs_devices->rw_devices--; | |
715 | } | |
716 | ||
726551eb JB |
717 | if (device->missing) |
718 | fs_devices->missing_devices--; | |
d5e2003c | 719 | |
a1e8780a ID |
720 | new_device = btrfs_alloc_device(NULL, &device->devid, |
721 | device->uuid); | |
722 | BUG_ON(IS_ERR(new_device)); /* -ENOMEM */ | |
606686ee JB |
723 | |
724 | /* Safe because we are under uuid_mutex */ | |
99f5944b JB |
725 | if (device->name) { |
726 | name = rcu_string_strdup(device->name->str, GFP_NOFS); | |
a1e8780a | 727 | BUG_ON(!name); /* -ENOMEM */ |
99f5944b JB |
728 | rcu_assign_pointer(new_device->name, name); |
729 | } | |
a1e8780a | 730 | |
1f78160c | 731 | list_replace_rcu(&device->dev_list, &new_device->dev_list); |
a1e8780a | 732 | new_device->fs_devices = device->fs_devices; |
1f78160c XG |
733 | |
734 | call_rcu(&device->rcu, free_device); | |
8a4b83cc | 735 | } |
c9513edb XG |
736 | mutex_unlock(&fs_devices->device_list_mutex); |
737 | ||
e4404d6e YZ |
738 | WARN_ON(fs_devices->open_devices); |
739 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
740 | fs_devices->opened = 0; |
741 | fs_devices->seeding = 0; | |
2b82032c | 742 | |
8a4b83cc CM |
743 | return 0; |
744 | } | |
745 | ||
2b82032c YZ |
746 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
747 | { | |
e4404d6e | 748 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
749 | int ret; |
750 | ||
751 | mutex_lock(&uuid_mutex); | |
752 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
753 | if (!fs_devices->opened) { |
754 | seed_devices = fs_devices->seed; | |
755 | fs_devices->seed = NULL; | |
756 | } | |
2b82032c | 757 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
758 | |
759 | while (seed_devices) { | |
760 | fs_devices = seed_devices; | |
761 | seed_devices = fs_devices->seed; | |
762 | __btrfs_close_devices(fs_devices); | |
763 | free_fs_devices(fs_devices); | |
764 | } | |
bc178622 ES |
765 | /* |
766 | * Wait for rcu kworkers under __btrfs_close_devices | |
767 | * to finish all blkdev_puts so device is really | |
768 | * free when umount is done. | |
769 | */ | |
770 | rcu_barrier(); | |
2b82032c YZ |
771 | return ret; |
772 | } | |
773 | ||
e4404d6e YZ |
774 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
775 | fmode_t flags, void *holder) | |
8a4b83cc | 776 | { |
d5e2003c | 777 | struct request_queue *q; |
8a4b83cc CM |
778 | struct block_device *bdev; |
779 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 780 | struct btrfs_device *device; |
443f24fe | 781 | struct btrfs_device *latest_dev = NULL; |
a0af469b CM |
782 | struct buffer_head *bh; |
783 | struct btrfs_super_block *disk_super; | |
a0af469b | 784 | u64 devid; |
2b82032c | 785 | int seeding = 1; |
a0af469b | 786 | int ret = 0; |
8a4b83cc | 787 | |
d4d77629 TH |
788 | flags |= FMODE_EXCL; |
789 | ||
c6e30871 | 790 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
791 | if (device->bdev) |
792 | continue; | |
dfe25020 CM |
793 | if (!device->name) |
794 | continue; | |
795 | ||
f63e0cca ES |
796 | /* Just open everything we can; ignore failures here */ |
797 | if (btrfs_get_bdev_and_sb(device->name->str, flags, holder, 1, | |
798 | &bdev, &bh)) | |
beaf8ab3 | 799 | continue; |
a0af469b CM |
800 | |
801 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 802 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
a0af469b CM |
803 | if (devid != device->devid) |
804 | goto error_brelse; | |
805 | ||
2b82032c YZ |
806 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
807 | BTRFS_UUID_SIZE)) | |
808 | goto error_brelse; | |
809 | ||
810 | device->generation = btrfs_super_generation(disk_super); | |
443f24fe MX |
811 | if (!latest_dev || |
812 | device->generation > latest_dev->generation) | |
813 | latest_dev = device; | |
a0af469b | 814 | |
2b82032c YZ |
815 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
816 | device->writeable = 0; | |
817 | } else { | |
818 | device->writeable = !bdev_read_only(bdev); | |
819 | seeding = 0; | |
820 | } | |
821 | ||
d5e2003c | 822 | q = bdev_get_queue(bdev); |
90180da4 | 823 | if (blk_queue_discard(q)) |
d5e2003c | 824 | device->can_discard = 1; |
d5e2003c | 825 | |
8a4b83cc | 826 | device->bdev = bdev; |
dfe25020 | 827 | device->in_fs_metadata = 0; |
15916de8 CM |
828 | device->mode = flags; |
829 | ||
c289811c CM |
830 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
831 | fs_devices->rotating = 1; | |
832 | ||
a0af469b | 833 | fs_devices->open_devices++; |
55e50e45 ID |
834 | if (device->writeable && |
835 | device->devid != BTRFS_DEV_REPLACE_DEVID) { | |
2b82032c YZ |
836 | fs_devices->rw_devices++; |
837 | list_add(&device->dev_alloc_list, | |
838 | &fs_devices->alloc_list); | |
839 | } | |
4f6c9328 | 840 | brelse(bh); |
a0af469b | 841 | continue; |
a061fc8d | 842 | |
a0af469b CM |
843 | error_brelse: |
844 | brelse(bh); | |
d4d77629 | 845 | blkdev_put(bdev, flags); |
a0af469b | 846 | continue; |
8a4b83cc | 847 | } |
a0af469b | 848 | if (fs_devices->open_devices == 0) { |
20bcd649 | 849 | ret = -EINVAL; |
a0af469b CM |
850 | goto out; |
851 | } | |
2b82032c YZ |
852 | fs_devices->seeding = seeding; |
853 | fs_devices->opened = 1; | |
443f24fe | 854 | fs_devices->latest_bdev = latest_dev->bdev; |
2b82032c | 855 | fs_devices->total_rw_bytes = 0; |
a0af469b | 856 | out: |
2b82032c YZ |
857 | return ret; |
858 | } | |
859 | ||
860 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 861 | fmode_t flags, void *holder) |
2b82032c YZ |
862 | { |
863 | int ret; | |
864 | ||
865 | mutex_lock(&uuid_mutex); | |
866 | if (fs_devices->opened) { | |
e4404d6e YZ |
867 | fs_devices->opened++; |
868 | ret = 0; | |
2b82032c | 869 | } else { |
15916de8 | 870 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 871 | } |
8a4b83cc | 872 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
873 | return ret; |
874 | } | |
875 | ||
6f60cbd3 DS |
876 | /* |
877 | * Look for a btrfs signature on a device. This may be called out of the mount path | |
878 | * and we are not allowed to call set_blocksize during the scan. The superblock | |
879 | * is read via pagecache | |
880 | */ | |
97288f2c | 881 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
882 | struct btrfs_fs_devices **fs_devices_ret) |
883 | { | |
884 | struct btrfs_super_block *disk_super; | |
885 | struct block_device *bdev; | |
6f60cbd3 DS |
886 | struct page *page; |
887 | void *p; | |
888 | int ret = -EINVAL; | |
8a4b83cc | 889 | u64 devid; |
f2984462 | 890 | u64 transid; |
02db0844 | 891 | u64 total_devices; |
6f60cbd3 DS |
892 | u64 bytenr; |
893 | pgoff_t index; | |
8a4b83cc | 894 | |
6f60cbd3 DS |
895 | /* |
896 | * we would like to check all the supers, but that would make | |
897 | * a btrfs mount succeed after a mkfs from a different FS. | |
898 | * So, we need to add a special mount option to scan for | |
899 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead | |
900 | */ | |
901 | bytenr = btrfs_sb_offset(0); | |
d4d77629 | 902 | flags |= FMODE_EXCL; |
10f6327b | 903 | mutex_lock(&uuid_mutex); |
6f60cbd3 DS |
904 | |
905 | bdev = blkdev_get_by_path(path, flags, holder); | |
906 | ||
907 | if (IS_ERR(bdev)) { | |
908 | ret = PTR_ERR(bdev); | |
beaf8ab3 | 909 | goto error; |
6f60cbd3 DS |
910 | } |
911 | ||
912 | /* make sure our super fits in the device */ | |
913 | if (bytenr + PAGE_CACHE_SIZE >= i_size_read(bdev->bd_inode)) | |
914 | goto error_bdev_put; | |
915 | ||
916 | /* make sure our super fits in the page */ | |
917 | if (sizeof(*disk_super) > PAGE_CACHE_SIZE) | |
918 | goto error_bdev_put; | |
919 | ||
920 | /* make sure our super doesn't straddle pages on disk */ | |
921 | index = bytenr >> PAGE_CACHE_SHIFT; | |
922 | if ((bytenr + sizeof(*disk_super) - 1) >> PAGE_CACHE_SHIFT != index) | |
923 | goto error_bdev_put; | |
924 | ||
925 | /* pull in the page with our super */ | |
926 | page = read_cache_page_gfp(bdev->bd_inode->i_mapping, | |
927 | index, GFP_NOFS); | |
928 | ||
929 | if (IS_ERR_OR_NULL(page)) | |
930 | goto error_bdev_put; | |
931 | ||
932 | p = kmap(page); | |
933 | ||
934 | /* align our pointer to the offset of the super block */ | |
935 | disk_super = p + (bytenr & ~PAGE_CACHE_MASK); | |
936 | ||
937 | if (btrfs_super_bytenr(disk_super) != bytenr || | |
3cae210f | 938 | btrfs_super_magic(disk_super) != BTRFS_MAGIC) |
6f60cbd3 DS |
939 | goto error_unmap; |
940 | ||
a343832f | 941 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
f2984462 | 942 | transid = btrfs_super_generation(disk_super); |
02db0844 | 943 | total_devices = btrfs_super_num_devices(disk_super); |
6f60cbd3 | 944 | |
8a4b83cc | 945 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
60999ca4 DS |
946 | if (ret > 0) { |
947 | if (disk_super->label[0]) { | |
948 | if (disk_super->label[BTRFS_LABEL_SIZE - 1]) | |
949 | disk_super->label[BTRFS_LABEL_SIZE - 1] = '\0'; | |
950 | printk(KERN_INFO "BTRFS: device label %s ", disk_super->label); | |
951 | } else { | |
952 | printk(KERN_INFO "BTRFS: device fsid %pU ", disk_super->fsid); | |
953 | } | |
954 | ||
955 | printk(KERN_CONT "devid %llu transid %llu %s\n", devid, transid, path); | |
956 | ret = 0; | |
957 | } | |
02db0844 JB |
958 | if (!ret && fs_devices_ret) |
959 | (*fs_devices_ret)->total_devices = total_devices; | |
6f60cbd3 DS |
960 | |
961 | error_unmap: | |
962 | kunmap(page); | |
963 | page_cache_release(page); | |
964 | ||
965 | error_bdev_put: | |
d4d77629 | 966 | blkdev_put(bdev, flags); |
8a4b83cc | 967 | error: |
beaf8ab3 | 968 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
969 | return ret; |
970 | } | |
0b86a832 | 971 | |
6d07bcec MX |
972 | /* helper to account the used device space in the range */ |
973 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, | |
974 | u64 end, u64 *length) | |
975 | { | |
976 | struct btrfs_key key; | |
977 | struct btrfs_root *root = device->dev_root; | |
978 | struct btrfs_dev_extent *dev_extent; | |
979 | struct btrfs_path *path; | |
980 | u64 extent_end; | |
981 | int ret; | |
982 | int slot; | |
983 | struct extent_buffer *l; | |
984 | ||
985 | *length = 0; | |
986 | ||
63a212ab | 987 | if (start >= device->total_bytes || device->is_tgtdev_for_dev_replace) |
6d07bcec MX |
988 | return 0; |
989 | ||
990 | path = btrfs_alloc_path(); | |
991 | if (!path) | |
992 | return -ENOMEM; | |
993 | path->reada = 2; | |
994 | ||
995 | key.objectid = device->devid; | |
996 | key.offset = start; | |
997 | key.type = BTRFS_DEV_EXTENT_KEY; | |
998 | ||
999 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1000 | if (ret < 0) | |
1001 | goto out; | |
1002 | if (ret > 0) { | |
1003 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
1004 | if (ret < 0) | |
1005 | goto out; | |
1006 | } | |
1007 | ||
1008 | while (1) { | |
1009 | l = path->nodes[0]; | |
1010 | slot = path->slots[0]; | |
1011 | if (slot >= btrfs_header_nritems(l)) { | |
1012 | ret = btrfs_next_leaf(root, path); | |
1013 | if (ret == 0) | |
1014 | continue; | |
1015 | if (ret < 0) | |
1016 | goto out; | |
1017 | ||
1018 | break; | |
1019 | } | |
1020 | btrfs_item_key_to_cpu(l, &key, slot); | |
1021 | ||
1022 | if (key.objectid < device->devid) | |
1023 | goto next; | |
1024 | ||
1025 | if (key.objectid > device->devid) | |
1026 | break; | |
1027 | ||
962a298f | 1028 | if (key.type != BTRFS_DEV_EXTENT_KEY) |
6d07bcec MX |
1029 | goto next; |
1030 | ||
1031 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
1032 | extent_end = key.offset + btrfs_dev_extent_length(l, | |
1033 | dev_extent); | |
1034 | if (key.offset <= start && extent_end > end) { | |
1035 | *length = end - start + 1; | |
1036 | break; | |
1037 | } else if (key.offset <= start && extent_end > start) | |
1038 | *length += extent_end - start; | |
1039 | else if (key.offset > start && extent_end <= end) | |
1040 | *length += extent_end - key.offset; | |
1041 | else if (key.offset > start && key.offset <= end) { | |
1042 | *length += end - key.offset + 1; | |
1043 | break; | |
1044 | } else if (key.offset > end) | |
1045 | break; | |
1046 | ||
1047 | next: | |
1048 | path->slots[0]++; | |
1049 | } | |
1050 | ret = 0; | |
1051 | out: | |
1052 | btrfs_free_path(path); | |
1053 | return ret; | |
1054 | } | |
1055 | ||
6df9a95e JB |
1056 | static int contains_pending_extent(struct btrfs_trans_handle *trans, |
1057 | struct btrfs_device *device, | |
1058 | u64 *start, u64 len) | |
1059 | { | |
1060 | struct extent_map *em; | |
04216820 | 1061 | struct list_head *search_list = &trans->transaction->pending_chunks; |
6df9a95e JB |
1062 | int ret = 0; |
1063 | ||
04216820 FM |
1064 | again: |
1065 | list_for_each_entry(em, search_list, list) { | |
6df9a95e JB |
1066 | struct map_lookup *map; |
1067 | int i; | |
1068 | ||
1069 | map = (struct map_lookup *)em->bdev; | |
1070 | for (i = 0; i < map->num_stripes; i++) { | |
1071 | if (map->stripes[i].dev != device) | |
1072 | continue; | |
1073 | if (map->stripes[i].physical >= *start + len || | |
1074 | map->stripes[i].physical + em->orig_block_len <= | |
1075 | *start) | |
1076 | continue; | |
1077 | *start = map->stripes[i].physical + | |
1078 | em->orig_block_len; | |
1079 | ret = 1; | |
1080 | } | |
1081 | } | |
04216820 FM |
1082 | if (search_list == &trans->transaction->pending_chunks) { |
1083 | search_list = &trans->root->fs_info->pinned_chunks; | |
1084 | goto again; | |
1085 | } | |
6df9a95e JB |
1086 | |
1087 | return ret; | |
1088 | } | |
1089 | ||
1090 | ||
0b86a832 | 1091 | /* |
7bfc837d | 1092 | * find_free_dev_extent - find free space in the specified device |
7bfc837d MX |
1093 | * @device: the device which we search the free space in |
1094 | * @num_bytes: the size of the free space that we need | |
1095 | * @start: store the start of the free space. | |
1096 | * @len: the size of the free space. that we find, or the size of the max | |
1097 | * free space if we don't find suitable free space | |
1098 | * | |
0b86a832 CM |
1099 | * this uses a pretty simple search, the expectation is that it is |
1100 | * called very infrequently and that a given device has a small number | |
1101 | * of extents | |
7bfc837d MX |
1102 | * |
1103 | * @start is used to store the start of the free space if we find. But if we | |
1104 | * don't find suitable free space, it will be used to store the start position | |
1105 | * of the max free space. | |
1106 | * | |
1107 | * @len is used to store the size of the free space that we find. | |
1108 | * But if we don't find suitable free space, it is used to store the size of | |
1109 | * the max free space. | |
0b86a832 | 1110 | */ |
6df9a95e JB |
1111 | int find_free_dev_extent(struct btrfs_trans_handle *trans, |
1112 | struct btrfs_device *device, u64 num_bytes, | |
7bfc837d | 1113 | u64 *start, u64 *len) |
0b86a832 CM |
1114 | { |
1115 | struct btrfs_key key; | |
1116 | struct btrfs_root *root = device->dev_root; | |
7bfc837d | 1117 | struct btrfs_dev_extent *dev_extent; |
2b82032c | 1118 | struct btrfs_path *path; |
7bfc837d MX |
1119 | u64 hole_size; |
1120 | u64 max_hole_start; | |
1121 | u64 max_hole_size; | |
1122 | u64 extent_end; | |
1123 | u64 search_start; | |
0b86a832 CM |
1124 | u64 search_end = device->total_bytes; |
1125 | int ret; | |
7bfc837d | 1126 | int slot; |
0b86a832 CM |
1127 | struct extent_buffer *l; |
1128 | ||
0b86a832 CM |
1129 | /* FIXME use last free of some kind */ |
1130 | ||
8a4b83cc CM |
1131 | /* we don't want to overwrite the superblock on the drive, |
1132 | * so we make sure to start at an offset of at least 1MB | |
1133 | */ | |
a9c9bf68 | 1134 | search_start = max(root->fs_info->alloc_start, 1024ull * 1024); |
8f18cf13 | 1135 | |
6df9a95e JB |
1136 | path = btrfs_alloc_path(); |
1137 | if (!path) | |
1138 | return -ENOMEM; | |
1139 | again: | |
7bfc837d MX |
1140 | max_hole_start = search_start; |
1141 | max_hole_size = 0; | |
38c01b96 | 1142 | hole_size = 0; |
7bfc837d | 1143 | |
63a212ab | 1144 | if (search_start >= search_end || device->is_tgtdev_for_dev_replace) { |
7bfc837d | 1145 | ret = -ENOSPC; |
6df9a95e | 1146 | goto out; |
7bfc837d MX |
1147 | } |
1148 | ||
7bfc837d | 1149 | path->reada = 2; |
6df9a95e JB |
1150 | path->search_commit_root = 1; |
1151 | path->skip_locking = 1; | |
7bfc837d | 1152 | |
0b86a832 CM |
1153 | key.objectid = device->devid; |
1154 | key.offset = search_start; | |
1155 | key.type = BTRFS_DEV_EXTENT_KEY; | |
7bfc837d | 1156 | |
125ccb0a | 1157 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
0b86a832 | 1158 | if (ret < 0) |
7bfc837d | 1159 | goto out; |
1fcbac58 YZ |
1160 | if (ret > 0) { |
1161 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
1162 | if (ret < 0) | |
7bfc837d | 1163 | goto out; |
1fcbac58 | 1164 | } |
7bfc837d | 1165 | |
0b86a832 CM |
1166 | while (1) { |
1167 | l = path->nodes[0]; | |
1168 | slot = path->slots[0]; | |
1169 | if (slot >= btrfs_header_nritems(l)) { | |
1170 | ret = btrfs_next_leaf(root, path); | |
1171 | if (ret == 0) | |
1172 | continue; | |
1173 | if (ret < 0) | |
7bfc837d MX |
1174 | goto out; |
1175 | ||
1176 | break; | |
0b86a832 CM |
1177 | } |
1178 | btrfs_item_key_to_cpu(l, &key, slot); | |
1179 | ||
1180 | if (key.objectid < device->devid) | |
1181 | goto next; | |
1182 | ||
1183 | if (key.objectid > device->devid) | |
7bfc837d | 1184 | break; |
0b86a832 | 1185 | |
962a298f | 1186 | if (key.type != BTRFS_DEV_EXTENT_KEY) |
7bfc837d | 1187 | goto next; |
9779b72f | 1188 | |
7bfc837d MX |
1189 | if (key.offset > search_start) { |
1190 | hole_size = key.offset - search_start; | |
9779b72f | 1191 | |
6df9a95e JB |
1192 | /* |
1193 | * Have to check before we set max_hole_start, otherwise | |
1194 | * we could end up sending back this offset anyway. | |
1195 | */ | |
1196 | if (contains_pending_extent(trans, device, | |
1197 | &search_start, | |
1198 | hole_size)) | |
1199 | hole_size = 0; | |
1200 | ||
7bfc837d MX |
1201 | if (hole_size > max_hole_size) { |
1202 | max_hole_start = search_start; | |
1203 | max_hole_size = hole_size; | |
1204 | } | |
9779b72f | 1205 | |
7bfc837d MX |
1206 | /* |
1207 | * If this free space is greater than which we need, | |
1208 | * it must be the max free space that we have found | |
1209 | * until now, so max_hole_start must point to the start | |
1210 | * of this free space and the length of this free space | |
1211 | * is stored in max_hole_size. Thus, we return | |
1212 | * max_hole_start and max_hole_size and go back to the | |
1213 | * caller. | |
1214 | */ | |
1215 | if (hole_size >= num_bytes) { | |
1216 | ret = 0; | |
1217 | goto out; | |
0b86a832 CM |
1218 | } |
1219 | } | |
0b86a832 | 1220 | |
0b86a832 | 1221 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
7bfc837d MX |
1222 | extent_end = key.offset + btrfs_dev_extent_length(l, |
1223 | dev_extent); | |
1224 | if (extent_end > search_start) | |
1225 | search_start = extent_end; | |
0b86a832 CM |
1226 | next: |
1227 | path->slots[0]++; | |
1228 | cond_resched(); | |
1229 | } | |
0b86a832 | 1230 | |
38c01b96 | 1231 | /* |
1232 | * At this point, search_start should be the end of | |
1233 | * allocated dev extents, and when shrinking the device, | |
1234 | * search_end may be smaller than search_start. | |
1235 | */ | |
1236 | if (search_end > search_start) | |
1237 | hole_size = search_end - search_start; | |
1238 | ||
7bfc837d MX |
1239 | if (hole_size > max_hole_size) { |
1240 | max_hole_start = search_start; | |
1241 | max_hole_size = hole_size; | |
0b86a832 | 1242 | } |
0b86a832 | 1243 | |
6df9a95e JB |
1244 | if (contains_pending_extent(trans, device, &search_start, hole_size)) { |
1245 | btrfs_release_path(path); | |
1246 | goto again; | |
1247 | } | |
1248 | ||
7bfc837d MX |
1249 | /* See above. */ |
1250 | if (hole_size < num_bytes) | |
1251 | ret = -ENOSPC; | |
1252 | else | |
1253 | ret = 0; | |
1254 | ||
1255 | out: | |
2b82032c | 1256 | btrfs_free_path(path); |
7bfc837d | 1257 | *start = max_hole_start; |
b2117a39 | 1258 | if (len) |
7bfc837d | 1259 | *len = max_hole_size; |
0b86a832 CM |
1260 | return ret; |
1261 | } | |
1262 | ||
b2950863 | 1263 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 | 1264 | struct btrfs_device *device, |
2196d6e8 | 1265 | u64 start, u64 *dev_extent_len) |
8f18cf13 CM |
1266 | { |
1267 | int ret; | |
1268 | struct btrfs_path *path; | |
1269 | struct btrfs_root *root = device->dev_root; | |
1270 | struct btrfs_key key; | |
a061fc8d CM |
1271 | struct btrfs_key found_key; |
1272 | struct extent_buffer *leaf = NULL; | |
1273 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
1274 | |
1275 | path = btrfs_alloc_path(); | |
1276 | if (!path) | |
1277 | return -ENOMEM; | |
1278 | ||
1279 | key.objectid = device->devid; | |
1280 | key.offset = start; | |
1281 | key.type = BTRFS_DEV_EXTENT_KEY; | |
924cd8fb | 1282 | again: |
8f18cf13 | 1283 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
a061fc8d CM |
1284 | if (ret > 0) { |
1285 | ret = btrfs_previous_item(root, path, key.objectid, | |
1286 | BTRFS_DEV_EXTENT_KEY); | |
b0b802d7 TI |
1287 | if (ret) |
1288 | goto out; | |
a061fc8d CM |
1289 | leaf = path->nodes[0]; |
1290 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1291 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1292 | struct btrfs_dev_extent); | |
1293 | BUG_ON(found_key.offset > start || found_key.offset + | |
1294 | btrfs_dev_extent_length(leaf, extent) < start); | |
924cd8fb MX |
1295 | key = found_key; |
1296 | btrfs_release_path(path); | |
1297 | goto again; | |
a061fc8d CM |
1298 | } else if (ret == 0) { |
1299 | leaf = path->nodes[0]; | |
1300 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1301 | struct btrfs_dev_extent); | |
79787eaa JM |
1302 | } else { |
1303 | btrfs_error(root->fs_info, ret, "Slot search failed"); | |
1304 | goto out; | |
a061fc8d | 1305 | } |
8f18cf13 | 1306 | |
2196d6e8 MX |
1307 | *dev_extent_len = btrfs_dev_extent_length(leaf, extent); |
1308 | ||
8f18cf13 | 1309 | ret = btrfs_del_item(trans, root, path); |
79787eaa JM |
1310 | if (ret) { |
1311 | btrfs_error(root->fs_info, ret, | |
1312 | "Failed to remove dev extent item"); | |
13212b54 ZL |
1313 | } else { |
1314 | trans->transaction->have_free_bgs = 1; | |
79787eaa | 1315 | } |
b0b802d7 | 1316 | out: |
8f18cf13 CM |
1317 | btrfs_free_path(path); |
1318 | return ret; | |
1319 | } | |
1320 | ||
48a3b636 ES |
1321 | static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
1322 | struct btrfs_device *device, | |
1323 | u64 chunk_tree, u64 chunk_objectid, | |
1324 | u64 chunk_offset, u64 start, u64 num_bytes) | |
0b86a832 CM |
1325 | { |
1326 | int ret; | |
1327 | struct btrfs_path *path; | |
1328 | struct btrfs_root *root = device->dev_root; | |
1329 | struct btrfs_dev_extent *extent; | |
1330 | struct extent_buffer *leaf; | |
1331 | struct btrfs_key key; | |
1332 | ||
dfe25020 | 1333 | WARN_ON(!device->in_fs_metadata); |
63a212ab | 1334 | WARN_ON(device->is_tgtdev_for_dev_replace); |
0b86a832 CM |
1335 | path = btrfs_alloc_path(); |
1336 | if (!path) | |
1337 | return -ENOMEM; | |
1338 | ||
0b86a832 | 1339 | key.objectid = device->devid; |
2b82032c | 1340 | key.offset = start; |
0b86a832 CM |
1341 | key.type = BTRFS_DEV_EXTENT_KEY; |
1342 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1343 | sizeof(*extent)); | |
2cdcecbc MF |
1344 | if (ret) |
1345 | goto out; | |
0b86a832 CM |
1346 | |
1347 | leaf = path->nodes[0]; | |
1348 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1349 | struct btrfs_dev_extent); | |
e17cade2 CM |
1350 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
1351 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
1352 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
1353 | ||
1354 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
231e88f4 | 1355 | btrfs_dev_extent_chunk_tree_uuid(extent), BTRFS_UUID_SIZE); |
e17cade2 | 1356 | |
0b86a832 CM |
1357 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
1358 | btrfs_mark_buffer_dirty(leaf); | |
2cdcecbc | 1359 | out: |
0b86a832 CM |
1360 | btrfs_free_path(path); |
1361 | return ret; | |
1362 | } | |
1363 | ||
6df9a95e | 1364 | static u64 find_next_chunk(struct btrfs_fs_info *fs_info) |
0b86a832 | 1365 | { |
6df9a95e JB |
1366 | struct extent_map_tree *em_tree; |
1367 | struct extent_map *em; | |
1368 | struct rb_node *n; | |
1369 | u64 ret = 0; | |
0b86a832 | 1370 | |
6df9a95e JB |
1371 | em_tree = &fs_info->mapping_tree.map_tree; |
1372 | read_lock(&em_tree->lock); | |
1373 | n = rb_last(&em_tree->map); | |
1374 | if (n) { | |
1375 | em = rb_entry(n, struct extent_map, rb_node); | |
1376 | ret = em->start + em->len; | |
0b86a832 | 1377 | } |
6df9a95e JB |
1378 | read_unlock(&em_tree->lock); |
1379 | ||
0b86a832 CM |
1380 | return ret; |
1381 | } | |
1382 | ||
53f10659 ID |
1383 | static noinline int find_next_devid(struct btrfs_fs_info *fs_info, |
1384 | u64 *devid_ret) | |
0b86a832 CM |
1385 | { |
1386 | int ret; | |
1387 | struct btrfs_key key; | |
1388 | struct btrfs_key found_key; | |
2b82032c YZ |
1389 | struct btrfs_path *path; |
1390 | ||
2b82032c YZ |
1391 | path = btrfs_alloc_path(); |
1392 | if (!path) | |
1393 | return -ENOMEM; | |
0b86a832 CM |
1394 | |
1395 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1396 | key.type = BTRFS_DEV_ITEM_KEY; | |
1397 | key.offset = (u64)-1; | |
1398 | ||
53f10659 | 1399 | ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, path, 0, 0); |
0b86a832 CM |
1400 | if (ret < 0) |
1401 | goto error; | |
1402 | ||
79787eaa | 1403 | BUG_ON(ret == 0); /* Corruption */ |
0b86a832 | 1404 | |
53f10659 ID |
1405 | ret = btrfs_previous_item(fs_info->chunk_root, path, |
1406 | BTRFS_DEV_ITEMS_OBJECTID, | |
0b86a832 CM |
1407 | BTRFS_DEV_ITEM_KEY); |
1408 | if (ret) { | |
53f10659 | 1409 | *devid_ret = 1; |
0b86a832 CM |
1410 | } else { |
1411 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1412 | path->slots[0]); | |
53f10659 | 1413 | *devid_ret = found_key.offset + 1; |
0b86a832 CM |
1414 | } |
1415 | ret = 0; | |
1416 | error: | |
2b82032c | 1417 | btrfs_free_path(path); |
0b86a832 CM |
1418 | return ret; |
1419 | } | |
1420 | ||
1421 | /* | |
1422 | * the device information is stored in the chunk root | |
1423 | * the btrfs_device struct should be fully filled in | |
1424 | */ | |
48a3b636 ES |
1425 | static int btrfs_add_device(struct btrfs_trans_handle *trans, |
1426 | struct btrfs_root *root, | |
1427 | struct btrfs_device *device) | |
0b86a832 CM |
1428 | { |
1429 | int ret; | |
1430 | struct btrfs_path *path; | |
1431 | struct btrfs_dev_item *dev_item; | |
1432 | struct extent_buffer *leaf; | |
1433 | struct btrfs_key key; | |
1434 | unsigned long ptr; | |
0b86a832 CM |
1435 | |
1436 | root = root->fs_info->chunk_root; | |
1437 | ||
1438 | path = btrfs_alloc_path(); | |
1439 | if (!path) | |
1440 | return -ENOMEM; | |
1441 | ||
0b86a832 CM |
1442 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1443 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 1444 | key.offset = device->devid; |
0b86a832 CM |
1445 | |
1446 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 1447 | sizeof(*dev_item)); |
0b86a832 CM |
1448 | if (ret) |
1449 | goto out; | |
1450 | ||
1451 | leaf = path->nodes[0]; | |
1452 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1453 | ||
1454 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 1455 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
1456 | btrfs_set_device_type(leaf, dev_item, device->type); |
1457 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1458 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1459 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
7cc8e58d MX |
1460 | btrfs_set_device_total_bytes(leaf, dev_item, |
1461 | btrfs_device_get_disk_total_bytes(device)); | |
1462 | btrfs_set_device_bytes_used(leaf, dev_item, | |
1463 | btrfs_device_get_bytes_used(device)); | |
e17cade2 CM |
1464 | btrfs_set_device_group(leaf, dev_item, 0); |
1465 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
1466 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 1467 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 1468 | |
410ba3a2 | 1469 | ptr = btrfs_device_uuid(dev_item); |
e17cade2 | 1470 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
1473b24e | 1471 | ptr = btrfs_device_fsid(dev_item); |
2b82032c | 1472 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); |
0b86a832 | 1473 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 1474 | |
2b82032c | 1475 | ret = 0; |
0b86a832 CM |
1476 | out: |
1477 | btrfs_free_path(path); | |
1478 | return ret; | |
1479 | } | |
8f18cf13 | 1480 | |
5a1972bd QW |
1481 | /* |
1482 | * Function to update ctime/mtime for a given device path. | |
1483 | * Mainly used for ctime/mtime based probe like libblkid. | |
1484 | */ | |
1485 | static void update_dev_time(char *path_name) | |
1486 | { | |
1487 | struct file *filp; | |
1488 | ||
1489 | filp = filp_open(path_name, O_RDWR, 0); | |
98af592f | 1490 | if (IS_ERR(filp)) |
5a1972bd QW |
1491 | return; |
1492 | file_update_time(filp); | |
1493 | filp_close(filp, NULL); | |
1494 | return; | |
1495 | } | |
1496 | ||
a061fc8d CM |
1497 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
1498 | struct btrfs_device *device) | |
1499 | { | |
1500 | int ret; | |
1501 | struct btrfs_path *path; | |
a061fc8d | 1502 | struct btrfs_key key; |
a061fc8d CM |
1503 | struct btrfs_trans_handle *trans; |
1504 | ||
1505 | root = root->fs_info->chunk_root; | |
1506 | ||
1507 | path = btrfs_alloc_path(); | |
1508 | if (!path) | |
1509 | return -ENOMEM; | |
1510 | ||
a22285a6 | 1511 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1512 | if (IS_ERR(trans)) { |
1513 | btrfs_free_path(path); | |
1514 | return PTR_ERR(trans); | |
1515 | } | |
a061fc8d CM |
1516 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1517 | key.type = BTRFS_DEV_ITEM_KEY; | |
1518 | key.offset = device->devid; | |
1519 | ||
1520 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1521 | if (ret < 0) | |
1522 | goto out; | |
1523 | ||
1524 | if (ret > 0) { | |
1525 | ret = -ENOENT; | |
1526 | goto out; | |
1527 | } | |
1528 | ||
1529 | ret = btrfs_del_item(trans, root, path); | |
1530 | if (ret) | |
1531 | goto out; | |
a061fc8d CM |
1532 | out: |
1533 | btrfs_free_path(path); | |
1534 | btrfs_commit_transaction(trans, root); | |
1535 | return ret; | |
1536 | } | |
1537 | ||
1538 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
1539 | { | |
1540 | struct btrfs_device *device; | |
2b82032c | 1541 | struct btrfs_device *next_device; |
a061fc8d | 1542 | struct block_device *bdev; |
dfe25020 | 1543 | struct buffer_head *bh = NULL; |
a061fc8d | 1544 | struct btrfs_super_block *disk_super; |
1f78160c | 1545 | struct btrfs_fs_devices *cur_devices; |
a061fc8d CM |
1546 | u64 all_avail; |
1547 | u64 devid; | |
2b82032c YZ |
1548 | u64 num_devices; |
1549 | u8 *dev_uuid; | |
de98ced9 | 1550 | unsigned seq; |
a061fc8d | 1551 | int ret = 0; |
1f78160c | 1552 | bool clear_super = false; |
a061fc8d | 1553 | |
a061fc8d CM |
1554 | mutex_lock(&uuid_mutex); |
1555 | ||
de98ced9 MX |
1556 | do { |
1557 | seq = read_seqbegin(&root->fs_info->profiles_lock); | |
1558 | ||
1559 | all_avail = root->fs_info->avail_data_alloc_bits | | |
1560 | root->fs_info->avail_system_alloc_bits | | |
1561 | root->fs_info->avail_metadata_alloc_bits; | |
1562 | } while (read_seqretry(&root->fs_info->profiles_lock, seq)); | |
a061fc8d | 1563 | |
8dabb742 SB |
1564 | num_devices = root->fs_info->fs_devices->num_devices; |
1565 | btrfs_dev_replace_lock(&root->fs_info->dev_replace); | |
1566 | if (btrfs_dev_replace_is_ongoing(&root->fs_info->dev_replace)) { | |
1567 | WARN_ON(num_devices < 1); | |
1568 | num_devices--; | |
1569 | } | |
1570 | btrfs_dev_replace_unlock(&root->fs_info->dev_replace); | |
1571 | ||
1572 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && num_devices <= 4) { | |
183860f6 | 1573 | ret = BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET; |
a061fc8d CM |
1574 | goto out; |
1575 | } | |
1576 | ||
8dabb742 | 1577 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && num_devices <= 2) { |
183860f6 | 1578 | ret = BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET; |
a061fc8d CM |
1579 | goto out; |
1580 | } | |
1581 | ||
53b381b3 DW |
1582 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID5) && |
1583 | root->fs_info->fs_devices->rw_devices <= 2) { | |
183860f6 | 1584 | ret = BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET; |
53b381b3 DW |
1585 | goto out; |
1586 | } | |
1587 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID6) && | |
1588 | root->fs_info->fs_devices->rw_devices <= 3) { | |
183860f6 | 1589 | ret = BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET; |
53b381b3 DW |
1590 | goto out; |
1591 | } | |
1592 | ||
dfe25020 | 1593 | if (strcmp(device_path, "missing") == 0) { |
dfe25020 CM |
1594 | struct list_head *devices; |
1595 | struct btrfs_device *tmp; | |
a061fc8d | 1596 | |
dfe25020 CM |
1597 | device = NULL; |
1598 | devices = &root->fs_info->fs_devices->devices; | |
46224705 XG |
1599 | /* |
1600 | * It is safe to read the devices since the volume_mutex | |
1601 | * is held. | |
1602 | */ | |
c6e30871 | 1603 | list_for_each_entry(tmp, devices, dev_list) { |
63a212ab SB |
1604 | if (tmp->in_fs_metadata && |
1605 | !tmp->is_tgtdev_for_dev_replace && | |
1606 | !tmp->bdev) { | |
dfe25020 CM |
1607 | device = tmp; |
1608 | break; | |
1609 | } | |
1610 | } | |
1611 | bdev = NULL; | |
1612 | bh = NULL; | |
1613 | disk_super = NULL; | |
1614 | if (!device) { | |
183860f6 | 1615 | ret = BTRFS_ERROR_DEV_MISSING_NOT_FOUND; |
dfe25020 CM |
1616 | goto out; |
1617 | } | |
dfe25020 | 1618 | } else { |
beaf8ab3 | 1619 | ret = btrfs_get_bdev_and_sb(device_path, |
cc975eb4 | 1620 | FMODE_WRITE | FMODE_EXCL, |
beaf8ab3 SB |
1621 | root->fs_info->bdev_holder, 0, |
1622 | &bdev, &bh); | |
1623 | if (ret) | |
dfe25020 | 1624 | goto out; |
dfe25020 | 1625 | disk_super = (struct btrfs_super_block *)bh->b_data; |
a343832f | 1626 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
2b82032c | 1627 | dev_uuid = disk_super->dev_item.uuid; |
aa1b8cd4 | 1628 | device = btrfs_find_device(root->fs_info, devid, dev_uuid, |
2b82032c | 1629 | disk_super->fsid); |
dfe25020 CM |
1630 | if (!device) { |
1631 | ret = -ENOENT; | |
1632 | goto error_brelse; | |
1633 | } | |
2b82032c | 1634 | } |
dfe25020 | 1635 | |
63a212ab | 1636 | if (device->is_tgtdev_for_dev_replace) { |
183860f6 | 1637 | ret = BTRFS_ERROR_DEV_TGT_REPLACE; |
63a212ab SB |
1638 | goto error_brelse; |
1639 | } | |
1640 | ||
2b82032c | 1641 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
183860f6 | 1642 | ret = BTRFS_ERROR_DEV_ONLY_WRITABLE; |
2b82032c YZ |
1643 | goto error_brelse; |
1644 | } | |
1645 | ||
1646 | if (device->writeable) { | |
0c1daee0 | 1647 | lock_chunks(root); |
2b82032c | 1648 | list_del_init(&device->dev_alloc_list); |
c3929c36 | 1649 | device->fs_devices->rw_devices--; |
0c1daee0 | 1650 | unlock_chunks(root); |
1f78160c | 1651 | clear_super = true; |
dfe25020 | 1652 | } |
a061fc8d | 1653 | |
d7901554 | 1654 | mutex_unlock(&uuid_mutex); |
a061fc8d | 1655 | ret = btrfs_shrink_device(device, 0); |
d7901554 | 1656 | mutex_lock(&uuid_mutex); |
a061fc8d | 1657 | if (ret) |
9b3517e9 | 1658 | goto error_undo; |
a061fc8d | 1659 | |
63a212ab SB |
1660 | /* |
1661 | * TODO: the superblock still includes this device in its num_devices | |
1662 | * counter although write_all_supers() is not locked out. This | |
1663 | * could give a filesystem state which requires a degraded mount. | |
1664 | */ | |
a061fc8d CM |
1665 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
1666 | if (ret) | |
9b3517e9 | 1667 | goto error_undo; |
a061fc8d | 1668 | |
2b82032c | 1669 | device->in_fs_metadata = 0; |
aa1b8cd4 | 1670 | btrfs_scrub_cancel_dev(root->fs_info, device); |
e5e9a520 CM |
1671 | |
1672 | /* | |
1673 | * the device list mutex makes sure that we don't change | |
1674 | * the device list while someone else is writing out all | |
d7306801 FDBM |
1675 | * the device supers. Whoever is writing all supers, should |
1676 | * lock the device list mutex before getting the number of | |
1677 | * devices in the super block (super_copy). Conversely, | |
1678 | * whoever updates the number of devices in the super block | |
1679 | * (super_copy) should hold the device list mutex. | |
e5e9a520 | 1680 | */ |
1f78160c XG |
1681 | |
1682 | cur_devices = device->fs_devices; | |
e5e9a520 | 1683 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
1f78160c | 1684 | list_del_rcu(&device->dev_list); |
e5e9a520 | 1685 | |
e4404d6e | 1686 | device->fs_devices->num_devices--; |
02db0844 | 1687 | device->fs_devices->total_devices--; |
2b82032c | 1688 | |
cd02dca5 | 1689 | if (device->missing) |
3a7d55c8 | 1690 | device->fs_devices->missing_devices--; |
cd02dca5 | 1691 | |
2b82032c YZ |
1692 | next_device = list_entry(root->fs_info->fs_devices->devices.next, |
1693 | struct btrfs_device, dev_list); | |
1694 | if (device->bdev == root->fs_info->sb->s_bdev) | |
1695 | root->fs_info->sb->s_bdev = next_device->bdev; | |
1696 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) | |
1697 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1698 | ||
0bfaa9c5 | 1699 | if (device->bdev) { |
e4404d6e | 1700 | device->fs_devices->open_devices--; |
0bfaa9c5 ES |
1701 | /* remove sysfs entry */ |
1702 | btrfs_kobj_rm_device(root->fs_info, device); | |
1703 | } | |
99994cde | 1704 | |
1f78160c | 1705 | call_rcu(&device->rcu, free_device); |
e4404d6e | 1706 | |
6c41761f DS |
1707 | num_devices = btrfs_super_num_devices(root->fs_info->super_copy) - 1; |
1708 | btrfs_set_super_num_devices(root->fs_info->super_copy, num_devices); | |
d7306801 | 1709 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
2b82032c | 1710 | |
1f78160c | 1711 | if (cur_devices->open_devices == 0) { |
e4404d6e YZ |
1712 | struct btrfs_fs_devices *fs_devices; |
1713 | fs_devices = root->fs_info->fs_devices; | |
1714 | while (fs_devices) { | |
8321cf25 RS |
1715 | if (fs_devices->seed == cur_devices) { |
1716 | fs_devices->seed = cur_devices->seed; | |
e4404d6e | 1717 | break; |
8321cf25 | 1718 | } |
e4404d6e | 1719 | fs_devices = fs_devices->seed; |
2b82032c | 1720 | } |
1f78160c | 1721 | cur_devices->seed = NULL; |
1f78160c | 1722 | __btrfs_close_devices(cur_devices); |
1f78160c | 1723 | free_fs_devices(cur_devices); |
2b82032c YZ |
1724 | } |
1725 | ||
5af3e8cc SB |
1726 | root->fs_info->num_tolerated_disk_barrier_failures = |
1727 | btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info); | |
1728 | ||
2b82032c YZ |
1729 | /* |
1730 | * at this point, the device is zero sized. We want to | |
1731 | * remove it from the devices list and zero out the old super | |
1732 | */ | |
aa1b8cd4 | 1733 | if (clear_super && disk_super) { |
4d90d28b AJ |
1734 | u64 bytenr; |
1735 | int i; | |
1736 | ||
dfe25020 CM |
1737 | /* make sure this device isn't detected as part of |
1738 | * the FS anymore | |
1739 | */ | |
1740 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
1741 | set_buffer_dirty(bh); | |
1742 | sync_dirty_buffer(bh); | |
4d90d28b AJ |
1743 | |
1744 | /* clear the mirror copies of super block on the disk | |
1745 | * being removed, 0th copy is been taken care above and | |
1746 | * the below would take of the rest | |
1747 | */ | |
1748 | for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) { | |
1749 | bytenr = btrfs_sb_offset(i); | |
1750 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= | |
1751 | i_size_read(bdev->bd_inode)) | |
1752 | break; | |
1753 | ||
1754 | brelse(bh); | |
1755 | bh = __bread(bdev, bytenr / 4096, | |
1756 | BTRFS_SUPER_INFO_SIZE); | |
1757 | if (!bh) | |
1758 | continue; | |
1759 | ||
1760 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
1761 | ||
1762 | if (btrfs_super_bytenr(disk_super) != bytenr || | |
1763 | btrfs_super_magic(disk_super) != BTRFS_MAGIC) { | |
1764 | continue; | |
1765 | } | |
1766 | memset(&disk_super->magic, 0, | |
1767 | sizeof(disk_super->magic)); | |
1768 | set_buffer_dirty(bh); | |
1769 | sync_dirty_buffer(bh); | |
1770 | } | |
dfe25020 | 1771 | } |
a061fc8d | 1772 | |
a061fc8d | 1773 | ret = 0; |
a061fc8d | 1774 | |
5a1972bd QW |
1775 | if (bdev) { |
1776 | /* Notify udev that device has changed */ | |
3c911608 | 1777 | btrfs_kobject_uevent(bdev, KOBJ_CHANGE); |
b8b8ff59 | 1778 | |
5a1972bd QW |
1779 | /* Update ctime/mtime for device path for libblkid */ |
1780 | update_dev_time(device_path); | |
1781 | } | |
1782 | ||
a061fc8d CM |
1783 | error_brelse: |
1784 | brelse(bh); | |
dfe25020 | 1785 | if (bdev) |
e525fd89 | 1786 | blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
a061fc8d CM |
1787 | out: |
1788 | mutex_unlock(&uuid_mutex); | |
a061fc8d | 1789 | return ret; |
9b3517e9 ID |
1790 | error_undo: |
1791 | if (device->writeable) { | |
0c1daee0 | 1792 | lock_chunks(root); |
9b3517e9 ID |
1793 | list_add(&device->dev_alloc_list, |
1794 | &root->fs_info->fs_devices->alloc_list); | |
c3929c36 | 1795 | device->fs_devices->rw_devices++; |
0c1daee0 | 1796 | unlock_chunks(root); |
9b3517e9 ID |
1797 | } |
1798 | goto error_brelse; | |
a061fc8d CM |
1799 | } |
1800 | ||
084b6e7c QW |
1801 | void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_fs_info *fs_info, |
1802 | struct btrfs_device *srcdev) | |
e93c89c1 | 1803 | { |
d51908ce AJ |
1804 | struct btrfs_fs_devices *fs_devices; |
1805 | ||
e93c89c1 | 1806 | WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex)); |
1357272f | 1807 | |
25e8e911 AJ |
1808 | /* |
1809 | * in case of fs with no seed, srcdev->fs_devices will point | |
1810 | * to fs_devices of fs_info. However when the dev being replaced is | |
1811 | * a seed dev it will point to the seed's local fs_devices. In short | |
1812 | * srcdev will have its correct fs_devices in both the cases. | |
1813 | */ | |
1814 | fs_devices = srcdev->fs_devices; | |
d51908ce | 1815 | |
e93c89c1 SB |
1816 | list_del_rcu(&srcdev->dev_list); |
1817 | list_del_rcu(&srcdev->dev_alloc_list); | |
d51908ce | 1818 | fs_devices->num_devices--; |
82372bc8 | 1819 | if (srcdev->missing) |
d51908ce | 1820 | fs_devices->missing_devices--; |
e93c89c1 | 1821 | |
82372bc8 MX |
1822 | if (srcdev->writeable) { |
1823 | fs_devices->rw_devices--; | |
1824 | /* zero out the old super if it is writable */ | |
1825 | btrfs_scratch_superblock(srcdev); | |
1357272f ID |
1826 | } |
1827 | ||
82372bc8 | 1828 | if (srcdev->bdev) |
d51908ce | 1829 | fs_devices->open_devices--; |
084b6e7c QW |
1830 | } |
1831 | ||
1832 | void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info, | |
1833 | struct btrfs_device *srcdev) | |
1834 | { | |
1835 | struct btrfs_fs_devices *fs_devices = srcdev->fs_devices; | |
e93c89c1 SB |
1836 | |
1837 | call_rcu(&srcdev->rcu, free_device); | |
94d5f0c2 AJ |
1838 | |
1839 | /* | |
1840 | * unless fs_devices is seed fs, num_devices shouldn't go | |
1841 | * zero | |
1842 | */ | |
1843 | BUG_ON(!fs_devices->num_devices && !fs_devices->seeding); | |
1844 | ||
1845 | /* if this is no devs we rather delete the fs_devices */ | |
1846 | if (!fs_devices->num_devices) { | |
1847 | struct btrfs_fs_devices *tmp_fs_devices; | |
1848 | ||
1849 | tmp_fs_devices = fs_info->fs_devices; | |
1850 | while (tmp_fs_devices) { | |
1851 | if (tmp_fs_devices->seed == fs_devices) { | |
1852 | tmp_fs_devices->seed = fs_devices->seed; | |
1853 | break; | |
1854 | } | |
1855 | tmp_fs_devices = tmp_fs_devices->seed; | |
1856 | } | |
1857 | fs_devices->seed = NULL; | |
8bef8401 AJ |
1858 | __btrfs_close_devices(fs_devices); |
1859 | free_fs_devices(fs_devices); | |
94d5f0c2 | 1860 | } |
e93c89c1 SB |
1861 | } |
1862 | ||
1863 | void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
1864 | struct btrfs_device *tgtdev) | |
1865 | { | |
1866 | struct btrfs_device *next_device; | |
1867 | ||
67a2c45e | 1868 | mutex_lock(&uuid_mutex); |
e93c89c1 SB |
1869 | WARN_ON(!tgtdev); |
1870 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
1871 | if (tgtdev->bdev) { | |
1872 | btrfs_scratch_superblock(tgtdev); | |
1873 | fs_info->fs_devices->open_devices--; | |
1874 | } | |
1875 | fs_info->fs_devices->num_devices--; | |
e93c89c1 SB |
1876 | |
1877 | next_device = list_entry(fs_info->fs_devices->devices.next, | |
1878 | struct btrfs_device, dev_list); | |
1879 | if (tgtdev->bdev == fs_info->sb->s_bdev) | |
1880 | fs_info->sb->s_bdev = next_device->bdev; | |
1881 | if (tgtdev->bdev == fs_info->fs_devices->latest_bdev) | |
1882 | fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1883 | list_del_rcu(&tgtdev->dev_list); | |
1884 | ||
1885 | call_rcu(&tgtdev->rcu, free_device); | |
1886 | ||
1887 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
67a2c45e | 1888 | mutex_unlock(&uuid_mutex); |
e93c89c1 SB |
1889 | } |
1890 | ||
48a3b636 ES |
1891 | static int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path, |
1892 | struct btrfs_device **device) | |
7ba15b7d SB |
1893 | { |
1894 | int ret = 0; | |
1895 | struct btrfs_super_block *disk_super; | |
1896 | u64 devid; | |
1897 | u8 *dev_uuid; | |
1898 | struct block_device *bdev; | |
1899 | struct buffer_head *bh; | |
1900 | ||
1901 | *device = NULL; | |
1902 | ret = btrfs_get_bdev_and_sb(device_path, FMODE_READ, | |
1903 | root->fs_info->bdev_holder, 0, &bdev, &bh); | |
1904 | if (ret) | |
1905 | return ret; | |
1906 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
1907 | devid = btrfs_stack_device_id(&disk_super->dev_item); | |
1908 | dev_uuid = disk_super->dev_item.uuid; | |
aa1b8cd4 | 1909 | *device = btrfs_find_device(root->fs_info, devid, dev_uuid, |
7ba15b7d SB |
1910 | disk_super->fsid); |
1911 | brelse(bh); | |
1912 | if (!*device) | |
1913 | ret = -ENOENT; | |
1914 | blkdev_put(bdev, FMODE_READ); | |
1915 | return ret; | |
1916 | } | |
1917 | ||
1918 | int btrfs_find_device_missing_or_by_path(struct btrfs_root *root, | |
1919 | char *device_path, | |
1920 | struct btrfs_device **device) | |
1921 | { | |
1922 | *device = NULL; | |
1923 | if (strcmp(device_path, "missing") == 0) { | |
1924 | struct list_head *devices; | |
1925 | struct btrfs_device *tmp; | |
1926 | ||
1927 | devices = &root->fs_info->fs_devices->devices; | |
1928 | /* | |
1929 | * It is safe to read the devices since the volume_mutex | |
1930 | * is held by the caller. | |
1931 | */ | |
1932 | list_for_each_entry(tmp, devices, dev_list) { | |
1933 | if (tmp->in_fs_metadata && !tmp->bdev) { | |
1934 | *device = tmp; | |
1935 | break; | |
1936 | } | |
1937 | } | |
1938 | ||
1939 | if (!*device) { | |
efe120a0 | 1940 | btrfs_err(root->fs_info, "no missing device found"); |
7ba15b7d SB |
1941 | return -ENOENT; |
1942 | } | |
1943 | ||
1944 | return 0; | |
1945 | } else { | |
1946 | return btrfs_find_device_by_path(root, device_path, device); | |
1947 | } | |
1948 | } | |
1949 | ||
2b82032c YZ |
1950 | /* |
1951 | * does all the dirty work required for changing file system's UUID. | |
1952 | */ | |
125ccb0a | 1953 | static int btrfs_prepare_sprout(struct btrfs_root *root) |
2b82032c YZ |
1954 | { |
1955 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
1956 | struct btrfs_fs_devices *old_devices; | |
e4404d6e | 1957 | struct btrfs_fs_devices *seed_devices; |
6c41761f | 1958 | struct btrfs_super_block *disk_super = root->fs_info->super_copy; |
2b82032c YZ |
1959 | struct btrfs_device *device; |
1960 | u64 super_flags; | |
1961 | ||
1962 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 1963 | if (!fs_devices->seeding) |
2b82032c YZ |
1964 | return -EINVAL; |
1965 | ||
2208a378 ID |
1966 | seed_devices = __alloc_fs_devices(); |
1967 | if (IS_ERR(seed_devices)) | |
1968 | return PTR_ERR(seed_devices); | |
2b82032c | 1969 | |
e4404d6e YZ |
1970 | old_devices = clone_fs_devices(fs_devices); |
1971 | if (IS_ERR(old_devices)) { | |
1972 | kfree(seed_devices); | |
1973 | return PTR_ERR(old_devices); | |
2b82032c | 1974 | } |
e4404d6e | 1975 | |
2b82032c YZ |
1976 | list_add(&old_devices->list, &fs_uuids); |
1977 | ||
e4404d6e YZ |
1978 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
1979 | seed_devices->opened = 1; | |
1980 | INIT_LIST_HEAD(&seed_devices->devices); | |
1981 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
e5e9a520 | 1982 | mutex_init(&seed_devices->device_list_mutex); |
c9513edb XG |
1983 | |
1984 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c XG |
1985 | list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices, |
1986 | synchronize_rcu); | |
2196d6e8 MX |
1987 | list_for_each_entry(device, &seed_devices->devices, dev_list) |
1988 | device->fs_devices = seed_devices; | |
c9513edb | 1989 | |
2196d6e8 | 1990 | lock_chunks(root); |
e4404d6e | 1991 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); |
2196d6e8 | 1992 | unlock_chunks(root); |
e4404d6e | 1993 | |
2b82032c YZ |
1994 | fs_devices->seeding = 0; |
1995 | fs_devices->num_devices = 0; | |
1996 | fs_devices->open_devices = 0; | |
69611ac8 | 1997 | fs_devices->missing_devices = 0; |
69611ac8 | 1998 | fs_devices->rotating = 0; |
e4404d6e | 1999 | fs_devices->seed = seed_devices; |
2b82032c YZ |
2000 | |
2001 | generate_random_uuid(fs_devices->fsid); | |
2002 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
2003 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
f7171750 FDBM |
2004 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
2005 | ||
2b82032c YZ |
2006 | super_flags = btrfs_super_flags(disk_super) & |
2007 | ~BTRFS_SUPER_FLAG_SEEDING; | |
2008 | btrfs_set_super_flags(disk_super, super_flags); | |
2009 | ||
2010 | return 0; | |
2011 | } | |
2012 | ||
2013 | /* | |
2014 | * strore the expected generation for seed devices in device items. | |
2015 | */ | |
2016 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
2017 | struct btrfs_root *root) | |
2018 | { | |
2019 | struct btrfs_path *path; | |
2020 | struct extent_buffer *leaf; | |
2021 | struct btrfs_dev_item *dev_item; | |
2022 | struct btrfs_device *device; | |
2023 | struct btrfs_key key; | |
2024 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
2025 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
2026 | u64 devid; | |
2027 | int ret; | |
2028 | ||
2029 | path = btrfs_alloc_path(); | |
2030 | if (!path) | |
2031 | return -ENOMEM; | |
2032 | ||
2033 | root = root->fs_info->chunk_root; | |
2034 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
2035 | key.offset = 0; | |
2036 | key.type = BTRFS_DEV_ITEM_KEY; | |
2037 | ||
2038 | while (1) { | |
2039 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
2040 | if (ret < 0) | |
2041 | goto error; | |
2042 | ||
2043 | leaf = path->nodes[0]; | |
2044 | next_slot: | |
2045 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
2046 | ret = btrfs_next_leaf(root, path); | |
2047 | if (ret > 0) | |
2048 | break; | |
2049 | if (ret < 0) | |
2050 | goto error; | |
2051 | leaf = path->nodes[0]; | |
2052 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 2053 | btrfs_release_path(path); |
2b82032c YZ |
2054 | continue; |
2055 | } | |
2056 | ||
2057 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
2058 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
2059 | key.type != BTRFS_DEV_ITEM_KEY) | |
2060 | break; | |
2061 | ||
2062 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
2063 | struct btrfs_dev_item); | |
2064 | devid = btrfs_device_id(leaf, dev_item); | |
410ba3a2 | 2065 | read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item), |
2b82032c | 2066 | BTRFS_UUID_SIZE); |
1473b24e | 2067 | read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item), |
2b82032c | 2068 | BTRFS_UUID_SIZE); |
aa1b8cd4 SB |
2069 | device = btrfs_find_device(root->fs_info, devid, dev_uuid, |
2070 | fs_uuid); | |
79787eaa | 2071 | BUG_ON(!device); /* Logic error */ |
2b82032c YZ |
2072 | |
2073 | if (device->fs_devices->seeding) { | |
2074 | btrfs_set_device_generation(leaf, dev_item, | |
2075 | device->generation); | |
2076 | btrfs_mark_buffer_dirty(leaf); | |
2077 | } | |
2078 | ||
2079 | path->slots[0]++; | |
2080 | goto next_slot; | |
2081 | } | |
2082 | ret = 0; | |
2083 | error: | |
2084 | btrfs_free_path(path); | |
2085 | return ret; | |
2086 | } | |
2087 | ||
788f20eb CM |
2088 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
2089 | { | |
d5e2003c | 2090 | struct request_queue *q; |
788f20eb CM |
2091 | struct btrfs_trans_handle *trans; |
2092 | struct btrfs_device *device; | |
2093 | struct block_device *bdev; | |
788f20eb | 2094 | struct list_head *devices; |
2b82032c | 2095 | struct super_block *sb = root->fs_info->sb; |
606686ee | 2096 | struct rcu_string *name; |
3c1dbdf5 | 2097 | u64 tmp; |
2b82032c | 2098 | int seeding_dev = 0; |
788f20eb CM |
2099 | int ret = 0; |
2100 | ||
2b82032c | 2101 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
f8c5d0b4 | 2102 | return -EROFS; |
788f20eb | 2103 | |
a5d16333 | 2104 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, |
d4d77629 | 2105 | root->fs_info->bdev_holder); |
7f59203a JB |
2106 | if (IS_ERR(bdev)) |
2107 | return PTR_ERR(bdev); | |
a2135011 | 2108 | |
2b82032c YZ |
2109 | if (root->fs_info->fs_devices->seeding) { |
2110 | seeding_dev = 1; | |
2111 | down_write(&sb->s_umount); | |
2112 | mutex_lock(&uuid_mutex); | |
2113 | } | |
2114 | ||
8c8bee1d | 2115 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
a2135011 | 2116 | |
788f20eb | 2117 | devices = &root->fs_info->fs_devices->devices; |
d25628bd LB |
2118 | |
2119 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
c6e30871 | 2120 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
2121 | if (device->bdev == bdev) { |
2122 | ret = -EEXIST; | |
d25628bd LB |
2123 | mutex_unlock( |
2124 | &root->fs_info->fs_devices->device_list_mutex); | |
2b82032c | 2125 | goto error; |
788f20eb CM |
2126 | } |
2127 | } | |
d25628bd | 2128 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 2129 | |
12bd2fc0 ID |
2130 | device = btrfs_alloc_device(root->fs_info, NULL, NULL); |
2131 | if (IS_ERR(device)) { | |
788f20eb | 2132 | /* we can safely leave the fs_devices entry around */ |
12bd2fc0 | 2133 | ret = PTR_ERR(device); |
2b82032c | 2134 | goto error; |
788f20eb CM |
2135 | } |
2136 | ||
606686ee JB |
2137 | name = rcu_string_strdup(device_path, GFP_NOFS); |
2138 | if (!name) { | |
788f20eb | 2139 | kfree(device); |
2b82032c YZ |
2140 | ret = -ENOMEM; |
2141 | goto error; | |
788f20eb | 2142 | } |
606686ee | 2143 | rcu_assign_pointer(device->name, name); |
2b82032c | 2144 | |
a22285a6 | 2145 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 2146 | if (IS_ERR(trans)) { |
606686ee | 2147 | rcu_string_free(device->name); |
98d5dc13 TI |
2148 | kfree(device); |
2149 | ret = PTR_ERR(trans); | |
2150 | goto error; | |
2151 | } | |
2152 | ||
d5e2003c JB |
2153 | q = bdev_get_queue(bdev); |
2154 | if (blk_queue_discard(q)) | |
2155 | device->can_discard = 1; | |
2b82032c | 2156 | device->writeable = 1; |
2b82032c | 2157 | device->generation = trans->transid; |
788f20eb CM |
2158 | device->io_width = root->sectorsize; |
2159 | device->io_align = root->sectorsize; | |
2160 | device->sector_size = root->sectorsize; | |
2161 | device->total_bytes = i_size_read(bdev->bd_inode); | |
2cc3c559 | 2162 | device->disk_total_bytes = device->total_bytes; |
935e5cc9 | 2163 | device->commit_total_bytes = device->total_bytes; |
788f20eb CM |
2164 | device->dev_root = root->fs_info->dev_root; |
2165 | device->bdev = bdev; | |
dfe25020 | 2166 | device->in_fs_metadata = 1; |
63a212ab | 2167 | device->is_tgtdev_for_dev_replace = 0; |
fb01aa85 | 2168 | device->mode = FMODE_EXCL; |
27087f37 | 2169 | device->dev_stats_valid = 1; |
2b82032c | 2170 | set_blocksize(device->bdev, 4096); |
788f20eb | 2171 | |
2b82032c YZ |
2172 | if (seeding_dev) { |
2173 | sb->s_flags &= ~MS_RDONLY; | |
125ccb0a | 2174 | ret = btrfs_prepare_sprout(root); |
79787eaa | 2175 | BUG_ON(ret); /* -ENOMEM */ |
2b82032c | 2176 | } |
788f20eb | 2177 | |
2b82032c | 2178 | device->fs_devices = root->fs_info->fs_devices; |
e5e9a520 | 2179 | |
e5e9a520 | 2180 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
2196d6e8 | 2181 | lock_chunks(root); |
1f78160c | 2182 | list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices); |
2b82032c YZ |
2183 | list_add(&device->dev_alloc_list, |
2184 | &root->fs_info->fs_devices->alloc_list); | |
2185 | root->fs_info->fs_devices->num_devices++; | |
2186 | root->fs_info->fs_devices->open_devices++; | |
2187 | root->fs_info->fs_devices->rw_devices++; | |
02db0844 | 2188 | root->fs_info->fs_devices->total_devices++; |
2b82032c | 2189 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; |
325cd4ba | 2190 | |
2bf64758 JB |
2191 | spin_lock(&root->fs_info->free_chunk_lock); |
2192 | root->fs_info->free_chunk_space += device->total_bytes; | |
2193 | spin_unlock(&root->fs_info->free_chunk_lock); | |
2194 | ||
c289811c CM |
2195 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
2196 | root->fs_info->fs_devices->rotating = 1; | |
2197 | ||
3c1dbdf5 | 2198 | tmp = btrfs_super_total_bytes(root->fs_info->super_copy); |
6c41761f | 2199 | btrfs_set_super_total_bytes(root->fs_info->super_copy, |
3c1dbdf5 | 2200 | tmp + device->total_bytes); |
788f20eb | 2201 | |
3c1dbdf5 | 2202 | tmp = btrfs_super_num_devices(root->fs_info->super_copy); |
6c41761f | 2203 | btrfs_set_super_num_devices(root->fs_info->super_copy, |
3c1dbdf5 | 2204 | tmp + 1); |
0d39376a AJ |
2205 | |
2206 | /* add sysfs device entry */ | |
2207 | btrfs_kobj_add_device(root->fs_info, device); | |
2208 | ||
2196d6e8 MX |
2209 | /* |
2210 | * we've got more storage, clear any full flags on the space | |
2211 | * infos | |
2212 | */ | |
2213 | btrfs_clear_space_info_full(root->fs_info); | |
2214 | ||
2215 | unlock_chunks(root); | |
e5e9a520 | 2216 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 2217 | |
2b82032c | 2218 | if (seeding_dev) { |
2196d6e8 | 2219 | lock_chunks(root); |
2b82032c | 2220 | ret = init_first_rw_device(trans, root, device); |
2196d6e8 | 2221 | unlock_chunks(root); |
005d6427 DS |
2222 | if (ret) { |
2223 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 2224 | goto error_trans; |
005d6427 | 2225 | } |
2196d6e8 MX |
2226 | } |
2227 | ||
2228 | ret = btrfs_add_device(trans, root, device); | |
2229 | if (ret) { | |
2230 | btrfs_abort_transaction(trans, root, ret); | |
2231 | goto error_trans; | |
2232 | } | |
2233 | ||
2234 | if (seeding_dev) { | |
2235 | char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; | |
2236 | ||
2b82032c | 2237 | ret = btrfs_finish_sprout(trans, root); |
005d6427 DS |
2238 | if (ret) { |
2239 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 2240 | goto error_trans; |
005d6427 | 2241 | } |
b2373f25 AJ |
2242 | |
2243 | /* Sprouting would change fsid of the mounted root, | |
2244 | * so rename the fsid on the sysfs | |
2245 | */ | |
2246 | snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", | |
2247 | root->fs_info->fsid); | |
2248 | if (kobject_rename(&root->fs_info->super_kobj, fsid_buf)) | |
2249 | goto error_trans; | |
2b82032c YZ |
2250 | } |
2251 | ||
5af3e8cc SB |
2252 | root->fs_info->num_tolerated_disk_barrier_failures = |
2253 | btrfs_calc_num_tolerated_disk_barrier_failures(root->fs_info); | |
79787eaa | 2254 | ret = btrfs_commit_transaction(trans, root); |
a2135011 | 2255 | |
2b82032c YZ |
2256 | if (seeding_dev) { |
2257 | mutex_unlock(&uuid_mutex); | |
2258 | up_write(&sb->s_umount); | |
788f20eb | 2259 | |
79787eaa JM |
2260 | if (ret) /* transaction commit */ |
2261 | return ret; | |
2262 | ||
2b82032c | 2263 | ret = btrfs_relocate_sys_chunks(root); |
79787eaa JM |
2264 | if (ret < 0) |
2265 | btrfs_error(root->fs_info, ret, | |
2266 | "Failed to relocate sys chunks after " | |
2267 | "device initialization. This can be fixed " | |
2268 | "using the \"btrfs balance\" command."); | |
671415b7 MX |
2269 | trans = btrfs_attach_transaction(root); |
2270 | if (IS_ERR(trans)) { | |
2271 | if (PTR_ERR(trans) == -ENOENT) | |
2272 | return 0; | |
2273 | return PTR_ERR(trans); | |
2274 | } | |
2275 | ret = btrfs_commit_transaction(trans, root); | |
2b82032c | 2276 | } |
c9e9f97b | 2277 | |
5a1972bd QW |
2278 | /* Update ctime/mtime for libblkid */ |
2279 | update_dev_time(device_path); | |
2b82032c | 2280 | return ret; |
79787eaa JM |
2281 | |
2282 | error_trans: | |
79787eaa | 2283 | btrfs_end_transaction(trans, root); |
606686ee | 2284 | rcu_string_free(device->name); |
0d39376a | 2285 | btrfs_kobj_rm_device(root->fs_info, device); |
79787eaa | 2286 | kfree(device); |
2b82032c | 2287 | error: |
e525fd89 | 2288 | blkdev_put(bdev, FMODE_EXCL); |
2b82032c YZ |
2289 | if (seeding_dev) { |
2290 | mutex_unlock(&uuid_mutex); | |
2291 | up_write(&sb->s_umount); | |
2292 | } | |
c9e9f97b | 2293 | return ret; |
788f20eb CM |
2294 | } |
2295 | ||
e93c89c1 | 2296 | int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path, |
1c43366d | 2297 | struct btrfs_device *srcdev, |
e93c89c1 SB |
2298 | struct btrfs_device **device_out) |
2299 | { | |
2300 | struct request_queue *q; | |
2301 | struct btrfs_device *device; | |
2302 | struct block_device *bdev; | |
2303 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2304 | struct list_head *devices; | |
2305 | struct rcu_string *name; | |
12bd2fc0 | 2306 | u64 devid = BTRFS_DEV_REPLACE_DEVID; |
e93c89c1 SB |
2307 | int ret = 0; |
2308 | ||
2309 | *device_out = NULL; | |
1c43366d MX |
2310 | if (fs_info->fs_devices->seeding) { |
2311 | btrfs_err(fs_info, "the filesystem is a seed filesystem!"); | |
e93c89c1 | 2312 | return -EINVAL; |
1c43366d | 2313 | } |
e93c89c1 SB |
2314 | |
2315 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, | |
2316 | fs_info->bdev_holder); | |
1c43366d MX |
2317 | if (IS_ERR(bdev)) { |
2318 | btrfs_err(fs_info, "target device %s is invalid!", device_path); | |
e93c89c1 | 2319 | return PTR_ERR(bdev); |
1c43366d | 2320 | } |
e93c89c1 SB |
2321 | |
2322 | filemap_write_and_wait(bdev->bd_inode->i_mapping); | |
2323 | ||
2324 | devices = &fs_info->fs_devices->devices; | |
2325 | list_for_each_entry(device, devices, dev_list) { | |
2326 | if (device->bdev == bdev) { | |
1c43366d | 2327 | btrfs_err(fs_info, "target device is in the filesystem!"); |
e93c89c1 SB |
2328 | ret = -EEXIST; |
2329 | goto error; | |
2330 | } | |
2331 | } | |
2332 | ||
1c43366d | 2333 | |
7cc8e58d MX |
2334 | if (i_size_read(bdev->bd_inode) < |
2335 | btrfs_device_get_total_bytes(srcdev)) { | |
1c43366d MX |
2336 | btrfs_err(fs_info, "target device is smaller than source device!"); |
2337 | ret = -EINVAL; | |
2338 | goto error; | |
2339 | } | |
2340 | ||
2341 | ||
12bd2fc0 ID |
2342 | device = btrfs_alloc_device(NULL, &devid, NULL); |
2343 | if (IS_ERR(device)) { | |
2344 | ret = PTR_ERR(device); | |
e93c89c1 SB |
2345 | goto error; |
2346 | } | |
2347 | ||
2348 | name = rcu_string_strdup(device_path, GFP_NOFS); | |
2349 | if (!name) { | |
2350 | kfree(device); | |
2351 | ret = -ENOMEM; | |
2352 | goto error; | |
2353 | } | |
2354 | rcu_assign_pointer(device->name, name); | |
2355 | ||
2356 | q = bdev_get_queue(bdev); | |
2357 | if (blk_queue_discard(q)) | |
2358 | device->can_discard = 1; | |
2359 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2360 | device->writeable = 1; | |
e93c89c1 SB |
2361 | device->generation = 0; |
2362 | device->io_width = root->sectorsize; | |
2363 | device->io_align = root->sectorsize; | |
2364 | device->sector_size = root->sectorsize; | |
7cc8e58d MX |
2365 | device->total_bytes = btrfs_device_get_total_bytes(srcdev); |
2366 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); | |
2367 | device->bytes_used = btrfs_device_get_bytes_used(srcdev); | |
935e5cc9 MX |
2368 | ASSERT(list_empty(&srcdev->resized_list)); |
2369 | device->commit_total_bytes = srcdev->commit_total_bytes; | |
ce7213c7 | 2370 | device->commit_bytes_used = device->bytes_used; |
e93c89c1 SB |
2371 | device->dev_root = fs_info->dev_root; |
2372 | device->bdev = bdev; | |
2373 | device->in_fs_metadata = 1; | |
2374 | device->is_tgtdev_for_dev_replace = 1; | |
2375 | device->mode = FMODE_EXCL; | |
27087f37 | 2376 | device->dev_stats_valid = 1; |
e93c89c1 SB |
2377 | set_blocksize(device->bdev, 4096); |
2378 | device->fs_devices = fs_info->fs_devices; | |
2379 | list_add(&device->dev_list, &fs_info->fs_devices->devices); | |
2380 | fs_info->fs_devices->num_devices++; | |
2381 | fs_info->fs_devices->open_devices++; | |
e93c89c1 SB |
2382 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
2383 | ||
2384 | *device_out = device; | |
2385 | return ret; | |
2386 | ||
2387 | error: | |
2388 | blkdev_put(bdev, FMODE_EXCL); | |
2389 | return ret; | |
2390 | } | |
2391 | ||
2392 | void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info, | |
2393 | struct btrfs_device *tgtdev) | |
2394 | { | |
2395 | WARN_ON(fs_info->fs_devices->rw_devices == 0); | |
2396 | tgtdev->io_width = fs_info->dev_root->sectorsize; | |
2397 | tgtdev->io_align = fs_info->dev_root->sectorsize; | |
2398 | tgtdev->sector_size = fs_info->dev_root->sectorsize; | |
2399 | tgtdev->dev_root = fs_info->dev_root; | |
2400 | tgtdev->in_fs_metadata = 1; | |
2401 | } | |
2402 | ||
d397712b CM |
2403 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
2404 | struct btrfs_device *device) | |
0b86a832 CM |
2405 | { |
2406 | int ret; | |
2407 | struct btrfs_path *path; | |
2408 | struct btrfs_root *root; | |
2409 | struct btrfs_dev_item *dev_item; | |
2410 | struct extent_buffer *leaf; | |
2411 | struct btrfs_key key; | |
2412 | ||
2413 | root = device->dev_root->fs_info->chunk_root; | |
2414 | ||
2415 | path = btrfs_alloc_path(); | |
2416 | if (!path) | |
2417 | return -ENOMEM; | |
2418 | ||
2419 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
2420 | key.type = BTRFS_DEV_ITEM_KEY; | |
2421 | key.offset = device->devid; | |
2422 | ||
2423 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
2424 | if (ret < 0) | |
2425 | goto out; | |
2426 | ||
2427 | if (ret > 0) { | |
2428 | ret = -ENOENT; | |
2429 | goto out; | |
2430 | } | |
2431 | ||
2432 | leaf = path->nodes[0]; | |
2433 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
2434 | ||
2435 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2436 | btrfs_set_device_type(leaf, dev_item, device->type); | |
2437 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
2438 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
2439 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
7cc8e58d MX |
2440 | btrfs_set_device_total_bytes(leaf, dev_item, |
2441 | btrfs_device_get_disk_total_bytes(device)); | |
2442 | btrfs_set_device_bytes_used(leaf, dev_item, | |
2443 | btrfs_device_get_bytes_used(device)); | |
0b86a832 CM |
2444 | btrfs_mark_buffer_dirty(leaf); |
2445 | ||
2446 | out: | |
2447 | btrfs_free_path(path); | |
2448 | return ret; | |
2449 | } | |
2450 | ||
2196d6e8 | 2451 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
2452 | struct btrfs_device *device, u64 new_size) |
2453 | { | |
2454 | struct btrfs_super_block *super_copy = | |
6c41761f | 2455 | device->dev_root->fs_info->super_copy; |
935e5cc9 | 2456 | struct btrfs_fs_devices *fs_devices; |
2196d6e8 MX |
2457 | u64 old_total; |
2458 | u64 diff; | |
8f18cf13 | 2459 | |
2b82032c YZ |
2460 | if (!device->writeable) |
2461 | return -EACCES; | |
2196d6e8 MX |
2462 | |
2463 | lock_chunks(device->dev_root); | |
2464 | old_total = btrfs_super_total_bytes(super_copy); | |
2465 | diff = new_size - device->total_bytes; | |
2466 | ||
63a212ab | 2467 | if (new_size <= device->total_bytes || |
2196d6e8 MX |
2468 | device->is_tgtdev_for_dev_replace) { |
2469 | unlock_chunks(device->dev_root); | |
2b82032c | 2470 | return -EINVAL; |
2196d6e8 | 2471 | } |
2b82032c | 2472 | |
935e5cc9 | 2473 | fs_devices = device->dev_root->fs_info->fs_devices; |
2b82032c | 2474 | |
8f18cf13 | 2475 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
2b82032c YZ |
2476 | device->fs_devices->total_rw_bytes += diff; |
2477 | ||
7cc8e58d MX |
2478 | btrfs_device_set_total_bytes(device, new_size); |
2479 | btrfs_device_set_disk_total_bytes(device, new_size); | |
4184ea7f | 2480 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
935e5cc9 MX |
2481 | if (list_empty(&device->resized_list)) |
2482 | list_add_tail(&device->resized_list, | |
2483 | &fs_devices->resized_devices); | |
2196d6e8 | 2484 | unlock_chunks(device->dev_root); |
4184ea7f | 2485 | |
8f18cf13 CM |
2486 | return btrfs_update_device(trans, device); |
2487 | } | |
2488 | ||
2489 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, | |
a688a04a | 2490 | struct btrfs_root *root, u64 chunk_objectid, |
8f18cf13 CM |
2491 | u64 chunk_offset) |
2492 | { | |
2493 | int ret; | |
2494 | struct btrfs_path *path; | |
2495 | struct btrfs_key key; | |
2496 | ||
2497 | root = root->fs_info->chunk_root; | |
2498 | path = btrfs_alloc_path(); | |
2499 | if (!path) | |
2500 | return -ENOMEM; | |
2501 | ||
2502 | key.objectid = chunk_objectid; | |
2503 | key.offset = chunk_offset; | |
2504 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2505 | ||
2506 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
79787eaa JM |
2507 | if (ret < 0) |
2508 | goto out; | |
2509 | else if (ret > 0) { /* Logic error or corruption */ | |
2510 | btrfs_error(root->fs_info, -ENOENT, | |
2511 | "Failed lookup while freeing chunk."); | |
2512 | ret = -ENOENT; | |
2513 | goto out; | |
2514 | } | |
8f18cf13 CM |
2515 | |
2516 | ret = btrfs_del_item(trans, root, path); | |
79787eaa JM |
2517 | if (ret < 0) |
2518 | btrfs_error(root->fs_info, ret, | |
2519 | "Failed to delete chunk item."); | |
2520 | out: | |
8f18cf13 | 2521 | btrfs_free_path(path); |
65a246c5 | 2522 | return ret; |
8f18cf13 CM |
2523 | } |
2524 | ||
b2950863 | 2525 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
8f18cf13 CM |
2526 | chunk_offset) |
2527 | { | |
6c41761f | 2528 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 CM |
2529 | struct btrfs_disk_key *disk_key; |
2530 | struct btrfs_chunk *chunk; | |
2531 | u8 *ptr; | |
2532 | int ret = 0; | |
2533 | u32 num_stripes; | |
2534 | u32 array_size; | |
2535 | u32 len = 0; | |
2536 | u32 cur; | |
2537 | struct btrfs_key key; | |
2538 | ||
2196d6e8 | 2539 | lock_chunks(root); |
8f18cf13 CM |
2540 | array_size = btrfs_super_sys_array_size(super_copy); |
2541 | ||
2542 | ptr = super_copy->sys_chunk_array; | |
2543 | cur = 0; | |
2544 | ||
2545 | while (cur < array_size) { | |
2546 | disk_key = (struct btrfs_disk_key *)ptr; | |
2547 | btrfs_disk_key_to_cpu(&key, disk_key); | |
2548 | ||
2549 | len = sizeof(*disk_key); | |
2550 | ||
2551 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
2552 | chunk = (struct btrfs_chunk *)(ptr + len); | |
2553 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
2554 | len += btrfs_chunk_item_size(num_stripes); | |
2555 | } else { | |
2556 | ret = -EIO; | |
2557 | break; | |
2558 | } | |
2559 | if (key.objectid == chunk_objectid && | |
2560 | key.offset == chunk_offset) { | |
2561 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
2562 | array_size -= len; | |
2563 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
2564 | } else { | |
2565 | ptr += len; | |
2566 | cur += len; | |
2567 | } | |
2568 | } | |
2196d6e8 | 2569 | unlock_chunks(root); |
8f18cf13 CM |
2570 | return ret; |
2571 | } | |
2572 | ||
47ab2a6c JB |
2573 | int btrfs_remove_chunk(struct btrfs_trans_handle *trans, |
2574 | struct btrfs_root *root, u64 chunk_offset) | |
8f18cf13 CM |
2575 | { |
2576 | struct extent_map_tree *em_tree; | |
8f18cf13 | 2577 | struct extent_map *em; |
47ab2a6c | 2578 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
8f18cf13 | 2579 | struct map_lookup *map; |
2196d6e8 | 2580 | u64 dev_extent_len = 0; |
47ab2a6c | 2581 | u64 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
47ab2a6c | 2582 | int i, ret = 0; |
8f18cf13 | 2583 | |
47ab2a6c | 2584 | /* Just in case */ |
8f18cf13 | 2585 | root = root->fs_info->chunk_root; |
8f18cf13 CM |
2586 | em_tree = &root->fs_info->mapping_tree.map_tree; |
2587 | ||
890871be | 2588 | read_lock(&em_tree->lock); |
8f18cf13 | 2589 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); |
890871be | 2590 | read_unlock(&em_tree->lock); |
8f18cf13 | 2591 | |
47ab2a6c JB |
2592 | if (!em || em->start > chunk_offset || |
2593 | em->start + em->len < chunk_offset) { | |
2594 | /* | |
2595 | * This is a logic error, but we don't want to just rely on the | |
2596 | * user having built with ASSERT enabled, so if ASSERT doens't | |
2597 | * do anything we still error out. | |
2598 | */ | |
2599 | ASSERT(0); | |
2600 | if (em) | |
2601 | free_extent_map(em); | |
2602 | return -EINVAL; | |
2603 | } | |
8f18cf13 CM |
2604 | map = (struct map_lookup *)em->bdev; |
2605 | ||
2606 | for (i = 0; i < map->num_stripes; i++) { | |
47ab2a6c | 2607 | struct btrfs_device *device = map->stripes[i].dev; |
2196d6e8 MX |
2608 | ret = btrfs_free_dev_extent(trans, device, |
2609 | map->stripes[i].physical, | |
2610 | &dev_extent_len); | |
47ab2a6c JB |
2611 | if (ret) { |
2612 | btrfs_abort_transaction(trans, root, ret); | |
2613 | goto out; | |
2614 | } | |
a061fc8d | 2615 | |
2196d6e8 MX |
2616 | if (device->bytes_used > 0) { |
2617 | lock_chunks(root); | |
2618 | btrfs_device_set_bytes_used(device, | |
2619 | device->bytes_used - dev_extent_len); | |
2620 | spin_lock(&root->fs_info->free_chunk_lock); | |
2621 | root->fs_info->free_chunk_space += dev_extent_len; | |
2622 | spin_unlock(&root->fs_info->free_chunk_lock); | |
2623 | btrfs_clear_space_info_full(root->fs_info); | |
2624 | unlock_chunks(root); | |
2625 | } | |
a061fc8d | 2626 | |
dfe25020 CM |
2627 | if (map->stripes[i].dev) { |
2628 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
47ab2a6c JB |
2629 | if (ret) { |
2630 | btrfs_abort_transaction(trans, root, ret); | |
2631 | goto out; | |
2632 | } | |
dfe25020 | 2633 | } |
8f18cf13 | 2634 | } |
a688a04a | 2635 | ret = btrfs_free_chunk(trans, root, chunk_objectid, chunk_offset); |
47ab2a6c JB |
2636 | if (ret) { |
2637 | btrfs_abort_transaction(trans, root, ret); | |
2638 | goto out; | |
2639 | } | |
8f18cf13 | 2640 | |
1abe9b8a | 2641 | trace_btrfs_chunk_free(root, map, chunk_offset, em->len); |
2642 | ||
8f18cf13 CM |
2643 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2644 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
47ab2a6c JB |
2645 | if (ret) { |
2646 | btrfs_abort_transaction(trans, root, ret); | |
2647 | goto out; | |
2648 | } | |
8f18cf13 CM |
2649 | } |
2650 | ||
04216820 | 2651 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset, em); |
47ab2a6c JB |
2652 | if (ret) { |
2653 | btrfs_abort_transaction(trans, extent_root, ret); | |
2654 | goto out; | |
2655 | } | |
2b82032c | 2656 | |
47ab2a6c | 2657 | out: |
2b82032c YZ |
2658 | /* once for us */ |
2659 | free_extent_map(em); | |
47ab2a6c JB |
2660 | return ret; |
2661 | } | |
2b82032c | 2662 | |
47ab2a6c | 2663 | static int btrfs_relocate_chunk(struct btrfs_root *root, |
a688a04a ZL |
2664 | u64 chunk_objectid, |
2665 | u64 chunk_offset) | |
47ab2a6c JB |
2666 | { |
2667 | struct btrfs_root *extent_root; | |
2668 | struct btrfs_trans_handle *trans; | |
2669 | int ret; | |
2b82032c | 2670 | |
47ab2a6c JB |
2671 | root = root->fs_info->chunk_root; |
2672 | extent_root = root->fs_info->extent_root; | |
2673 | ||
2674 | ret = btrfs_can_relocate(extent_root, chunk_offset); | |
2675 | if (ret) | |
2676 | return -ENOSPC; | |
2677 | ||
2678 | /* step one, relocate all the extents inside this chunk */ | |
2679 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); | |
2680 | if (ret) | |
2681 | return ret; | |
2682 | ||
2683 | trans = btrfs_start_transaction(root, 0); | |
2684 | if (IS_ERR(trans)) { | |
2685 | ret = PTR_ERR(trans); | |
2686 | btrfs_std_error(root->fs_info, ret); | |
2687 | return ret; | |
2688 | } | |
2689 | ||
2690 | /* | |
2691 | * step two, delete the device extents and the | |
2692 | * chunk tree entries | |
2693 | */ | |
2694 | ret = btrfs_remove_chunk(trans, root, chunk_offset); | |
2b82032c | 2695 | btrfs_end_transaction(trans, root); |
47ab2a6c | 2696 | return ret; |
2b82032c YZ |
2697 | } |
2698 | ||
2699 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) | |
2700 | { | |
2701 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; | |
2702 | struct btrfs_path *path; | |
2703 | struct extent_buffer *leaf; | |
2704 | struct btrfs_chunk *chunk; | |
2705 | struct btrfs_key key; | |
2706 | struct btrfs_key found_key; | |
2b82032c | 2707 | u64 chunk_type; |
ba1bf481 JB |
2708 | bool retried = false; |
2709 | int failed = 0; | |
2b82032c YZ |
2710 | int ret; |
2711 | ||
2712 | path = btrfs_alloc_path(); | |
2713 | if (!path) | |
2714 | return -ENOMEM; | |
2715 | ||
ba1bf481 | 2716 | again: |
2b82032c YZ |
2717 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2718 | key.offset = (u64)-1; | |
2719 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2720 | ||
2721 | while (1) { | |
2722 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); | |
2723 | if (ret < 0) | |
2724 | goto error; | |
79787eaa | 2725 | BUG_ON(ret == 0); /* Corruption */ |
2b82032c YZ |
2726 | |
2727 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
2728 | key.type); | |
2729 | if (ret < 0) | |
2730 | goto error; | |
2731 | if (ret > 0) | |
2732 | break; | |
1a40e23b | 2733 | |
2b82032c YZ |
2734 | leaf = path->nodes[0]; |
2735 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 2736 | |
2b82032c YZ |
2737 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
2738 | struct btrfs_chunk); | |
2739 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
b3b4aa74 | 2740 | btrfs_release_path(path); |
8f18cf13 | 2741 | |
2b82032c | 2742 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
a688a04a | 2743 | ret = btrfs_relocate_chunk(chunk_root, |
2b82032c YZ |
2744 | found_key.objectid, |
2745 | found_key.offset); | |
ba1bf481 JB |
2746 | if (ret == -ENOSPC) |
2747 | failed++; | |
14586651 HS |
2748 | else |
2749 | BUG_ON(ret); | |
2b82032c | 2750 | } |
8f18cf13 | 2751 | |
2b82032c YZ |
2752 | if (found_key.offset == 0) |
2753 | break; | |
2754 | key.offset = found_key.offset - 1; | |
2755 | } | |
2756 | ret = 0; | |
ba1bf481 JB |
2757 | if (failed && !retried) { |
2758 | failed = 0; | |
2759 | retried = true; | |
2760 | goto again; | |
fae7f21c | 2761 | } else if (WARN_ON(failed && retried)) { |
ba1bf481 JB |
2762 | ret = -ENOSPC; |
2763 | } | |
2b82032c YZ |
2764 | error: |
2765 | btrfs_free_path(path); | |
2766 | return ret; | |
8f18cf13 CM |
2767 | } |
2768 | ||
0940ebf6 ID |
2769 | static int insert_balance_item(struct btrfs_root *root, |
2770 | struct btrfs_balance_control *bctl) | |
2771 | { | |
2772 | struct btrfs_trans_handle *trans; | |
2773 | struct btrfs_balance_item *item; | |
2774 | struct btrfs_disk_balance_args disk_bargs; | |
2775 | struct btrfs_path *path; | |
2776 | struct extent_buffer *leaf; | |
2777 | struct btrfs_key key; | |
2778 | int ret, err; | |
2779 | ||
2780 | path = btrfs_alloc_path(); | |
2781 | if (!path) | |
2782 | return -ENOMEM; | |
2783 | ||
2784 | trans = btrfs_start_transaction(root, 0); | |
2785 | if (IS_ERR(trans)) { | |
2786 | btrfs_free_path(path); | |
2787 | return PTR_ERR(trans); | |
2788 | } | |
2789 | ||
2790 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
2791 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
2792 | key.offset = 0; | |
2793 | ||
2794 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
2795 | sizeof(*item)); | |
2796 | if (ret) | |
2797 | goto out; | |
2798 | ||
2799 | leaf = path->nodes[0]; | |
2800 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
2801 | ||
2802 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
2803 | ||
2804 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data); | |
2805 | btrfs_set_balance_data(leaf, item, &disk_bargs); | |
2806 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->meta); | |
2807 | btrfs_set_balance_meta(leaf, item, &disk_bargs); | |
2808 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->sys); | |
2809 | btrfs_set_balance_sys(leaf, item, &disk_bargs); | |
2810 | ||
2811 | btrfs_set_balance_flags(leaf, item, bctl->flags); | |
2812 | ||
2813 | btrfs_mark_buffer_dirty(leaf); | |
2814 | out: | |
2815 | btrfs_free_path(path); | |
2816 | err = btrfs_commit_transaction(trans, root); | |
2817 | if (err && !ret) | |
2818 | ret = err; | |
2819 | return ret; | |
2820 | } | |
2821 | ||
2822 | static int del_balance_item(struct btrfs_root *root) | |
2823 | { | |
2824 | struct btrfs_trans_handle *trans; | |
2825 | struct btrfs_path *path; | |
2826 | struct btrfs_key key; | |
2827 | int ret, err; | |
2828 | ||
2829 | path = btrfs_alloc_path(); | |
2830 | if (!path) | |
2831 | return -ENOMEM; | |
2832 | ||
2833 | trans = btrfs_start_transaction(root, 0); | |
2834 | if (IS_ERR(trans)) { | |
2835 | btrfs_free_path(path); | |
2836 | return PTR_ERR(trans); | |
2837 | } | |
2838 | ||
2839 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
2840 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
2841 | key.offset = 0; | |
2842 | ||
2843 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
2844 | if (ret < 0) | |
2845 | goto out; | |
2846 | if (ret > 0) { | |
2847 | ret = -ENOENT; | |
2848 | goto out; | |
2849 | } | |
2850 | ||
2851 | ret = btrfs_del_item(trans, root, path); | |
2852 | out: | |
2853 | btrfs_free_path(path); | |
2854 | err = btrfs_commit_transaction(trans, root); | |
2855 | if (err && !ret) | |
2856 | ret = err; | |
2857 | return ret; | |
2858 | } | |
2859 | ||
59641015 ID |
2860 | /* |
2861 | * This is a heuristic used to reduce the number of chunks balanced on | |
2862 | * resume after balance was interrupted. | |
2863 | */ | |
2864 | static void update_balance_args(struct btrfs_balance_control *bctl) | |
2865 | { | |
2866 | /* | |
2867 | * Turn on soft mode for chunk types that were being converted. | |
2868 | */ | |
2869 | if (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
2870 | bctl->data.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
2871 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
2872 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
2873 | if (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
2874 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
2875 | ||
2876 | /* | |
2877 | * Turn on usage filter if is not already used. The idea is | |
2878 | * that chunks that we have already balanced should be | |
2879 | * reasonably full. Don't do it for chunks that are being | |
2880 | * converted - that will keep us from relocating unconverted | |
2881 | * (albeit full) chunks. | |
2882 | */ | |
2883 | if (!(bctl->data.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2884 | !(bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
2885 | bctl->data.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
2886 | bctl->data.usage = 90; | |
2887 | } | |
2888 | if (!(bctl->sys.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2889 | !(bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
2890 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
2891 | bctl->sys.usage = 90; | |
2892 | } | |
2893 | if (!(bctl->meta.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2894 | !(bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
2895 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
2896 | bctl->meta.usage = 90; | |
2897 | } | |
2898 | } | |
2899 | ||
c9e9f97b ID |
2900 | /* |
2901 | * Should be called with both balance and volume mutexes held to | |
2902 | * serialize other volume operations (add_dev/rm_dev/resize) with | |
2903 | * restriper. Same goes for unset_balance_control. | |
2904 | */ | |
2905 | static void set_balance_control(struct btrfs_balance_control *bctl) | |
2906 | { | |
2907 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
2908 | ||
2909 | BUG_ON(fs_info->balance_ctl); | |
2910 | ||
2911 | spin_lock(&fs_info->balance_lock); | |
2912 | fs_info->balance_ctl = bctl; | |
2913 | spin_unlock(&fs_info->balance_lock); | |
2914 | } | |
2915 | ||
2916 | static void unset_balance_control(struct btrfs_fs_info *fs_info) | |
2917 | { | |
2918 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
2919 | ||
2920 | BUG_ON(!fs_info->balance_ctl); | |
2921 | ||
2922 | spin_lock(&fs_info->balance_lock); | |
2923 | fs_info->balance_ctl = NULL; | |
2924 | spin_unlock(&fs_info->balance_lock); | |
2925 | ||
2926 | kfree(bctl); | |
2927 | } | |
2928 | ||
ed25e9b2 ID |
2929 | /* |
2930 | * Balance filters. Return 1 if chunk should be filtered out | |
2931 | * (should not be balanced). | |
2932 | */ | |
899c81ea | 2933 | static int chunk_profiles_filter(u64 chunk_type, |
ed25e9b2 ID |
2934 | struct btrfs_balance_args *bargs) |
2935 | { | |
899c81ea ID |
2936 | chunk_type = chunk_to_extended(chunk_type) & |
2937 | BTRFS_EXTENDED_PROFILE_MASK; | |
ed25e9b2 | 2938 | |
899c81ea | 2939 | if (bargs->profiles & chunk_type) |
ed25e9b2 ID |
2940 | return 0; |
2941 | ||
2942 | return 1; | |
2943 | } | |
2944 | ||
5ce5b3c0 ID |
2945 | static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset, |
2946 | struct btrfs_balance_args *bargs) | |
2947 | { | |
2948 | struct btrfs_block_group_cache *cache; | |
2949 | u64 chunk_used, user_thresh; | |
2950 | int ret = 1; | |
2951 | ||
2952 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
2953 | chunk_used = btrfs_block_group_used(&cache->item); | |
2954 | ||
a105bb88 | 2955 | if (bargs->usage == 0) |
3e39cea6 | 2956 | user_thresh = 1; |
a105bb88 ID |
2957 | else if (bargs->usage > 100) |
2958 | user_thresh = cache->key.offset; | |
2959 | else | |
2960 | user_thresh = div_factor_fine(cache->key.offset, | |
2961 | bargs->usage); | |
2962 | ||
5ce5b3c0 ID |
2963 | if (chunk_used < user_thresh) |
2964 | ret = 0; | |
2965 | ||
2966 | btrfs_put_block_group(cache); | |
2967 | return ret; | |
2968 | } | |
2969 | ||
409d404b ID |
2970 | static int chunk_devid_filter(struct extent_buffer *leaf, |
2971 | struct btrfs_chunk *chunk, | |
2972 | struct btrfs_balance_args *bargs) | |
2973 | { | |
2974 | struct btrfs_stripe *stripe; | |
2975 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
2976 | int i; | |
2977 | ||
2978 | for (i = 0; i < num_stripes; i++) { | |
2979 | stripe = btrfs_stripe_nr(chunk, i); | |
2980 | if (btrfs_stripe_devid(leaf, stripe) == bargs->devid) | |
2981 | return 0; | |
2982 | } | |
2983 | ||
2984 | return 1; | |
2985 | } | |
2986 | ||
94e60d5a ID |
2987 | /* [pstart, pend) */ |
2988 | static int chunk_drange_filter(struct extent_buffer *leaf, | |
2989 | struct btrfs_chunk *chunk, | |
2990 | u64 chunk_offset, | |
2991 | struct btrfs_balance_args *bargs) | |
2992 | { | |
2993 | struct btrfs_stripe *stripe; | |
2994 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
2995 | u64 stripe_offset; | |
2996 | u64 stripe_length; | |
2997 | int factor; | |
2998 | int i; | |
2999 | ||
3000 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_DEVID)) | |
3001 | return 0; | |
3002 | ||
3003 | if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP | | |
53b381b3 DW |
3004 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)) { |
3005 | factor = num_stripes / 2; | |
3006 | } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID5) { | |
3007 | factor = num_stripes - 1; | |
3008 | } else if (btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_RAID6) { | |
3009 | factor = num_stripes - 2; | |
3010 | } else { | |
3011 | factor = num_stripes; | |
3012 | } | |
94e60d5a ID |
3013 | |
3014 | for (i = 0; i < num_stripes; i++) { | |
3015 | stripe = btrfs_stripe_nr(chunk, i); | |
3016 | if (btrfs_stripe_devid(leaf, stripe) != bargs->devid) | |
3017 | continue; | |
3018 | ||
3019 | stripe_offset = btrfs_stripe_offset(leaf, stripe); | |
3020 | stripe_length = btrfs_chunk_length(leaf, chunk); | |
3021 | do_div(stripe_length, factor); | |
3022 | ||
3023 | if (stripe_offset < bargs->pend && | |
3024 | stripe_offset + stripe_length > bargs->pstart) | |
3025 | return 0; | |
3026 | } | |
3027 | ||
3028 | return 1; | |
3029 | } | |
3030 | ||
ea67176a ID |
3031 | /* [vstart, vend) */ |
3032 | static int chunk_vrange_filter(struct extent_buffer *leaf, | |
3033 | struct btrfs_chunk *chunk, | |
3034 | u64 chunk_offset, | |
3035 | struct btrfs_balance_args *bargs) | |
3036 | { | |
3037 | if (chunk_offset < bargs->vend && | |
3038 | chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart) | |
3039 | /* at least part of the chunk is inside this vrange */ | |
3040 | return 0; | |
3041 | ||
3042 | return 1; | |
3043 | } | |
3044 | ||
899c81ea | 3045 | static int chunk_soft_convert_filter(u64 chunk_type, |
cfa4c961 ID |
3046 | struct btrfs_balance_args *bargs) |
3047 | { | |
3048 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT)) | |
3049 | return 0; | |
3050 | ||
899c81ea ID |
3051 | chunk_type = chunk_to_extended(chunk_type) & |
3052 | BTRFS_EXTENDED_PROFILE_MASK; | |
cfa4c961 | 3053 | |
899c81ea | 3054 | if (bargs->target == chunk_type) |
cfa4c961 ID |
3055 | return 1; |
3056 | ||
3057 | return 0; | |
3058 | } | |
3059 | ||
f43ffb60 ID |
3060 | static int should_balance_chunk(struct btrfs_root *root, |
3061 | struct extent_buffer *leaf, | |
3062 | struct btrfs_chunk *chunk, u64 chunk_offset) | |
3063 | { | |
3064 | struct btrfs_balance_control *bctl = root->fs_info->balance_ctl; | |
3065 | struct btrfs_balance_args *bargs = NULL; | |
3066 | u64 chunk_type = btrfs_chunk_type(leaf, chunk); | |
3067 | ||
3068 | /* type filter */ | |
3069 | if (!((chunk_type & BTRFS_BLOCK_GROUP_TYPE_MASK) & | |
3070 | (bctl->flags & BTRFS_BALANCE_TYPE_MASK))) { | |
3071 | return 0; | |
3072 | } | |
3073 | ||
3074 | if (chunk_type & BTRFS_BLOCK_GROUP_DATA) | |
3075 | bargs = &bctl->data; | |
3076 | else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) | |
3077 | bargs = &bctl->sys; | |
3078 | else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA) | |
3079 | bargs = &bctl->meta; | |
3080 | ||
ed25e9b2 ID |
3081 | /* profiles filter */ |
3082 | if ((bargs->flags & BTRFS_BALANCE_ARGS_PROFILES) && | |
3083 | chunk_profiles_filter(chunk_type, bargs)) { | |
3084 | return 0; | |
5ce5b3c0 ID |
3085 | } |
3086 | ||
3087 | /* usage filter */ | |
3088 | if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) && | |
3089 | chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) { | |
3090 | return 0; | |
409d404b ID |
3091 | } |
3092 | ||
3093 | /* devid filter */ | |
3094 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DEVID) && | |
3095 | chunk_devid_filter(leaf, chunk, bargs)) { | |
3096 | return 0; | |
94e60d5a ID |
3097 | } |
3098 | ||
3099 | /* drange filter, makes sense only with devid filter */ | |
3100 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) && | |
3101 | chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) { | |
3102 | return 0; | |
ea67176a ID |
3103 | } |
3104 | ||
3105 | /* vrange filter */ | |
3106 | if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) && | |
3107 | chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) { | |
3108 | return 0; | |
ed25e9b2 ID |
3109 | } |
3110 | ||
cfa4c961 ID |
3111 | /* soft profile changing mode */ |
3112 | if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) && | |
3113 | chunk_soft_convert_filter(chunk_type, bargs)) { | |
3114 | return 0; | |
3115 | } | |
3116 | ||
7d824b6f DS |
3117 | /* |
3118 | * limited by count, must be the last filter | |
3119 | */ | |
3120 | if ((bargs->flags & BTRFS_BALANCE_ARGS_LIMIT)) { | |
3121 | if (bargs->limit == 0) | |
3122 | return 0; | |
3123 | else | |
3124 | bargs->limit--; | |
3125 | } | |
3126 | ||
f43ffb60 ID |
3127 | return 1; |
3128 | } | |
3129 | ||
c9e9f97b | 3130 | static int __btrfs_balance(struct btrfs_fs_info *fs_info) |
ec44a35c | 3131 | { |
19a39dce | 3132 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
c9e9f97b ID |
3133 | struct btrfs_root *chunk_root = fs_info->chunk_root; |
3134 | struct btrfs_root *dev_root = fs_info->dev_root; | |
3135 | struct list_head *devices; | |
ec44a35c CM |
3136 | struct btrfs_device *device; |
3137 | u64 old_size; | |
3138 | u64 size_to_free; | |
f43ffb60 | 3139 | struct btrfs_chunk *chunk; |
ec44a35c CM |
3140 | struct btrfs_path *path; |
3141 | struct btrfs_key key; | |
ec44a35c | 3142 | struct btrfs_key found_key; |
c9e9f97b | 3143 | struct btrfs_trans_handle *trans; |
f43ffb60 ID |
3144 | struct extent_buffer *leaf; |
3145 | int slot; | |
c9e9f97b ID |
3146 | int ret; |
3147 | int enospc_errors = 0; | |
19a39dce | 3148 | bool counting = true; |
7d824b6f DS |
3149 | u64 limit_data = bctl->data.limit; |
3150 | u64 limit_meta = bctl->meta.limit; | |
3151 | u64 limit_sys = bctl->sys.limit; | |
ec44a35c | 3152 | |
ec44a35c | 3153 | /* step one make some room on all the devices */ |
c9e9f97b | 3154 | devices = &fs_info->fs_devices->devices; |
c6e30871 | 3155 | list_for_each_entry(device, devices, dev_list) { |
7cc8e58d | 3156 | old_size = btrfs_device_get_total_bytes(device); |
ec44a35c CM |
3157 | size_to_free = div_factor(old_size, 1); |
3158 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
2b82032c | 3159 | if (!device->writeable || |
7cc8e58d MX |
3160 | btrfs_device_get_total_bytes(device) - |
3161 | btrfs_device_get_bytes_used(device) > size_to_free || | |
63a212ab | 3162 | device->is_tgtdev_for_dev_replace) |
ec44a35c CM |
3163 | continue; |
3164 | ||
3165 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
ba1bf481 JB |
3166 | if (ret == -ENOSPC) |
3167 | break; | |
ec44a35c CM |
3168 | BUG_ON(ret); |
3169 | ||
a22285a6 | 3170 | trans = btrfs_start_transaction(dev_root, 0); |
98d5dc13 | 3171 | BUG_ON(IS_ERR(trans)); |
ec44a35c CM |
3172 | |
3173 | ret = btrfs_grow_device(trans, device, old_size); | |
3174 | BUG_ON(ret); | |
3175 | ||
3176 | btrfs_end_transaction(trans, dev_root); | |
3177 | } | |
3178 | ||
3179 | /* step two, relocate all the chunks */ | |
3180 | path = btrfs_alloc_path(); | |
17e9f796 MF |
3181 | if (!path) { |
3182 | ret = -ENOMEM; | |
3183 | goto error; | |
3184 | } | |
19a39dce ID |
3185 | |
3186 | /* zero out stat counters */ | |
3187 | spin_lock(&fs_info->balance_lock); | |
3188 | memset(&bctl->stat, 0, sizeof(bctl->stat)); | |
3189 | spin_unlock(&fs_info->balance_lock); | |
3190 | again: | |
7d824b6f DS |
3191 | if (!counting) { |
3192 | bctl->data.limit = limit_data; | |
3193 | bctl->meta.limit = limit_meta; | |
3194 | bctl->sys.limit = limit_sys; | |
3195 | } | |
ec44a35c CM |
3196 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
3197 | key.offset = (u64)-1; | |
3198 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
3199 | ||
d397712b | 3200 | while (1) { |
19a39dce | 3201 | if ((!counting && atomic_read(&fs_info->balance_pause_req)) || |
a7e99c69 | 3202 | atomic_read(&fs_info->balance_cancel_req)) { |
837d5b6e ID |
3203 | ret = -ECANCELED; |
3204 | goto error; | |
3205 | } | |
3206 | ||
ec44a35c CM |
3207 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
3208 | if (ret < 0) | |
3209 | goto error; | |
3210 | ||
3211 | /* | |
3212 | * this shouldn't happen, it means the last relocate | |
3213 | * failed | |
3214 | */ | |
3215 | if (ret == 0) | |
c9e9f97b | 3216 | BUG(); /* FIXME break ? */ |
ec44a35c CM |
3217 | |
3218 | ret = btrfs_previous_item(chunk_root, path, 0, | |
3219 | BTRFS_CHUNK_ITEM_KEY); | |
c9e9f97b ID |
3220 | if (ret) { |
3221 | ret = 0; | |
ec44a35c | 3222 | break; |
c9e9f97b | 3223 | } |
7d9eb12c | 3224 | |
f43ffb60 ID |
3225 | leaf = path->nodes[0]; |
3226 | slot = path->slots[0]; | |
3227 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
7d9eb12c | 3228 | |
ec44a35c CM |
3229 | if (found_key.objectid != key.objectid) |
3230 | break; | |
7d9eb12c | 3231 | |
f43ffb60 ID |
3232 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); |
3233 | ||
19a39dce ID |
3234 | if (!counting) { |
3235 | spin_lock(&fs_info->balance_lock); | |
3236 | bctl->stat.considered++; | |
3237 | spin_unlock(&fs_info->balance_lock); | |
3238 | } | |
3239 | ||
f43ffb60 ID |
3240 | ret = should_balance_chunk(chunk_root, leaf, chunk, |
3241 | found_key.offset); | |
b3b4aa74 | 3242 | btrfs_release_path(path); |
f43ffb60 ID |
3243 | if (!ret) |
3244 | goto loop; | |
3245 | ||
19a39dce ID |
3246 | if (counting) { |
3247 | spin_lock(&fs_info->balance_lock); | |
3248 | bctl->stat.expected++; | |
3249 | spin_unlock(&fs_info->balance_lock); | |
3250 | goto loop; | |
3251 | } | |
3252 | ||
ec44a35c | 3253 | ret = btrfs_relocate_chunk(chunk_root, |
ec44a35c CM |
3254 | found_key.objectid, |
3255 | found_key.offset); | |
508794eb JB |
3256 | if (ret && ret != -ENOSPC) |
3257 | goto error; | |
19a39dce | 3258 | if (ret == -ENOSPC) { |
c9e9f97b | 3259 | enospc_errors++; |
19a39dce ID |
3260 | } else { |
3261 | spin_lock(&fs_info->balance_lock); | |
3262 | bctl->stat.completed++; | |
3263 | spin_unlock(&fs_info->balance_lock); | |
3264 | } | |
f43ffb60 | 3265 | loop: |
795a3321 ID |
3266 | if (found_key.offset == 0) |
3267 | break; | |
ba1bf481 | 3268 | key.offset = found_key.offset - 1; |
ec44a35c | 3269 | } |
c9e9f97b | 3270 | |
19a39dce ID |
3271 | if (counting) { |
3272 | btrfs_release_path(path); | |
3273 | counting = false; | |
3274 | goto again; | |
3275 | } | |
ec44a35c CM |
3276 | error: |
3277 | btrfs_free_path(path); | |
c9e9f97b | 3278 | if (enospc_errors) { |
efe120a0 | 3279 | btrfs_info(fs_info, "%d enospc errors during balance", |
c9e9f97b ID |
3280 | enospc_errors); |
3281 | if (!ret) | |
3282 | ret = -ENOSPC; | |
3283 | } | |
3284 | ||
ec44a35c CM |
3285 | return ret; |
3286 | } | |
3287 | ||
0c460c0d ID |
3288 | /** |
3289 | * alloc_profile_is_valid - see if a given profile is valid and reduced | |
3290 | * @flags: profile to validate | |
3291 | * @extended: if true @flags is treated as an extended profile | |
3292 | */ | |
3293 | static int alloc_profile_is_valid(u64 flags, int extended) | |
3294 | { | |
3295 | u64 mask = (extended ? BTRFS_EXTENDED_PROFILE_MASK : | |
3296 | BTRFS_BLOCK_GROUP_PROFILE_MASK); | |
3297 | ||
3298 | flags &= ~BTRFS_BLOCK_GROUP_TYPE_MASK; | |
3299 | ||
3300 | /* 1) check that all other bits are zeroed */ | |
3301 | if (flags & ~mask) | |
3302 | return 0; | |
3303 | ||
3304 | /* 2) see if profile is reduced */ | |
3305 | if (flags == 0) | |
3306 | return !extended; /* "0" is valid for usual profiles */ | |
3307 | ||
3308 | /* true if exactly one bit set */ | |
3309 | return (flags & (flags - 1)) == 0; | |
3310 | } | |
3311 | ||
837d5b6e ID |
3312 | static inline int balance_need_close(struct btrfs_fs_info *fs_info) |
3313 | { | |
a7e99c69 ID |
3314 | /* cancel requested || normal exit path */ |
3315 | return atomic_read(&fs_info->balance_cancel_req) || | |
3316 | (atomic_read(&fs_info->balance_pause_req) == 0 && | |
3317 | atomic_read(&fs_info->balance_cancel_req) == 0); | |
837d5b6e ID |
3318 | } |
3319 | ||
c9e9f97b ID |
3320 | static void __cancel_balance(struct btrfs_fs_info *fs_info) |
3321 | { | |
0940ebf6 ID |
3322 | int ret; |
3323 | ||
c9e9f97b | 3324 | unset_balance_control(fs_info); |
0940ebf6 | 3325 | ret = del_balance_item(fs_info->tree_root); |
0f788c58 LB |
3326 | if (ret) |
3327 | btrfs_std_error(fs_info, ret); | |
ed0fb78f ID |
3328 | |
3329 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
c9e9f97b ID |
3330 | } |
3331 | ||
c9e9f97b ID |
3332 | /* |
3333 | * Should be called with both balance and volume mutexes held | |
3334 | */ | |
3335 | int btrfs_balance(struct btrfs_balance_control *bctl, | |
3336 | struct btrfs_ioctl_balance_args *bargs) | |
3337 | { | |
3338 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
f43ffb60 | 3339 | u64 allowed; |
e4837f8f | 3340 | int mixed = 0; |
c9e9f97b | 3341 | int ret; |
8dabb742 | 3342 | u64 num_devices; |
de98ced9 | 3343 | unsigned seq; |
c9e9f97b | 3344 | |
837d5b6e | 3345 | if (btrfs_fs_closing(fs_info) || |
a7e99c69 ID |
3346 | atomic_read(&fs_info->balance_pause_req) || |
3347 | atomic_read(&fs_info->balance_cancel_req)) { | |
c9e9f97b ID |
3348 | ret = -EINVAL; |
3349 | goto out; | |
3350 | } | |
3351 | ||
e4837f8f ID |
3352 | allowed = btrfs_super_incompat_flags(fs_info->super_copy); |
3353 | if (allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
3354 | mixed = 1; | |
3355 | ||
f43ffb60 ID |
3356 | /* |
3357 | * In case of mixed groups both data and meta should be picked, | |
3358 | * and identical options should be given for both of them. | |
3359 | */ | |
e4837f8f ID |
3360 | allowed = BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA; |
3361 | if (mixed && (bctl->flags & allowed)) { | |
f43ffb60 ID |
3362 | if (!(bctl->flags & BTRFS_BALANCE_DATA) || |
3363 | !(bctl->flags & BTRFS_BALANCE_METADATA) || | |
3364 | memcmp(&bctl->data, &bctl->meta, sizeof(bctl->data))) { | |
efe120a0 FH |
3365 | btrfs_err(fs_info, "with mixed groups data and " |
3366 | "metadata balance options must be the same"); | |
f43ffb60 ID |
3367 | ret = -EINVAL; |
3368 | goto out; | |
3369 | } | |
3370 | } | |
3371 | ||
8dabb742 SB |
3372 | num_devices = fs_info->fs_devices->num_devices; |
3373 | btrfs_dev_replace_lock(&fs_info->dev_replace); | |
3374 | if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) { | |
3375 | BUG_ON(num_devices < 1); | |
3376 | num_devices--; | |
3377 | } | |
3378 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
e4d8ec0f | 3379 | allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE; |
8dabb742 | 3380 | if (num_devices == 1) |
e4d8ec0f | 3381 | allowed |= BTRFS_BLOCK_GROUP_DUP; |
8250dabe | 3382 | else if (num_devices > 1) |
e4d8ec0f | 3383 | allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1); |
8250dabe AP |
3384 | if (num_devices > 2) |
3385 | allowed |= BTRFS_BLOCK_GROUP_RAID5; | |
3386 | if (num_devices > 3) | |
3387 | allowed |= (BTRFS_BLOCK_GROUP_RAID10 | | |
3388 | BTRFS_BLOCK_GROUP_RAID6); | |
6728b198 ID |
3389 | if ((bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) && |
3390 | (!alloc_profile_is_valid(bctl->data.target, 1) || | |
3391 | (bctl->data.target & ~allowed))) { | |
efe120a0 FH |
3392 | btrfs_err(fs_info, "unable to start balance with target " |
3393 | "data profile %llu", | |
c1c9ff7c | 3394 | bctl->data.target); |
e4d8ec0f ID |
3395 | ret = -EINVAL; |
3396 | goto out; | |
3397 | } | |
6728b198 ID |
3398 | if ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) && |
3399 | (!alloc_profile_is_valid(bctl->meta.target, 1) || | |
3400 | (bctl->meta.target & ~allowed))) { | |
efe120a0 FH |
3401 | btrfs_err(fs_info, |
3402 | "unable to start balance with target metadata profile %llu", | |
c1c9ff7c | 3403 | bctl->meta.target); |
e4d8ec0f ID |
3404 | ret = -EINVAL; |
3405 | goto out; | |
3406 | } | |
6728b198 ID |
3407 | if ((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) && |
3408 | (!alloc_profile_is_valid(bctl->sys.target, 1) || | |
3409 | (bctl->sys.target & ~allowed))) { | |
efe120a0 FH |
3410 | btrfs_err(fs_info, |
3411 | "unable to start balance with target system profile %llu", | |
c1c9ff7c | 3412 | bctl->sys.target); |
e4d8ec0f ID |
3413 | ret = -EINVAL; |
3414 | goto out; | |
3415 | } | |
3416 | ||
e4837f8f ID |
3417 | /* allow dup'ed data chunks only in mixed mode */ |
3418 | if (!mixed && (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
6728b198 | 3419 | (bctl->data.target & BTRFS_BLOCK_GROUP_DUP)) { |
efe120a0 | 3420 | btrfs_err(fs_info, "dup for data is not allowed"); |
e4d8ec0f ID |
3421 | ret = -EINVAL; |
3422 | goto out; | |
3423 | } | |
3424 | ||
3425 | /* allow to reduce meta or sys integrity only if force set */ | |
3426 | allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
53b381b3 DW |
3427 | BTRFS_BLOCK_GROUP_RAID10 | |
3428 | BTRFS_BLOCK_GROUP_RAID5 | | |
3429 | BTRFS_BLOCK_GROUP_RAID6; | |
de98ced9 MX |
3430 | do { |
3431 | seq = read_seqbegin(&fs_info->profiles_lock); | |
3432 | ||
3433 | if (((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3434 | (fs_info->avail_system_alloc_bits & allowed) && | |
3435 | !(bctl->sys.target & allowed)) || | |
3436 | ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
3437 | (fs_info->avail_metadata_alloc_bits & allowed) && | |
3438 | !(bctl->meta.target & allowed))) { | |
3439 | if (bctl->flags & BTRFS_BALANCE_FORCE) { | |
efe120a0 | 3440 | btrfs_info(fs_info, "force reducing metadata integrity"); |
de98ced9 | 3441 | } else { |
efe120a0 FH |
3442 | btrfs_err(fs_info, "balance will reduce metadata " |
3443 | "integrity, use force if you want this"); | |
de98ced9 MX |
3444 | ret = -EINVAL; |
3445 | goto out; | |
3446 | } | |
e4d8ec0f | 3447 | } |
de98ced9 | 3448 | } while (read_seqretry(&fs_info->profiles_lock, seq)); |
e4d8ec0f | 3449 | |
5af3e8cc SB |
3450 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
3451 | int num_tolerated_disk_barrier_failures; | |
3452 | u64 target = bctl->sys.target; | |
3453 | ||
3454 | num_tolerated_disk_barrier_failures = | |
3455 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); | |
3456 | if (num_tolerated_disk_barrier_failures > 0 && | |
3457 | (target & | |
3458 | (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 | | |
3459 | BTRFS_AVAIL_ALLOC_BIT_SINGLE))) | |
3460 | num_tolerated_disk_barrier_failures = 0; | |
3461 | else if (num_tolerated_disk_barrier_failures > 1 && | |
3462 | (target & | |
3463 | (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10))) | |
3464 | num_tolerated_disk_barrier_failures = 1; | |
3465 | ||
3466 | fs_info->num_tolerated_disk_barrier_failures = | |
3467 | num_tolerated_disk_barrier_failures; | |
3468 | } | |
3469 | ||
0940ebf6 | 3470 | ret = insert_balance_item(fs_info->tree_root, bctl); |
59641015 | 3471 | if (ret && ret != -EEXIST) |
0940ebf6 ID |
3472 | goto out; |
3473 | ||
59641015 ID |
3474 | if (!(bctl->flags & BTRFS_BALANCE_RESUME)) { |
3475 | BUG_ON(ret == -EEXIST); | |
3476 | set_balance_control(bctl); | |
3477 | } else { | |
3478 | BUG_ON(ret != -EEXIST); | |
3479 | spin_lock(&fs_info->balance_lock); | |
3480 | update_balance_args(bctl); | |
3481 | spin_unlock(&fs_info->balance_lock); | |
3482 | } | |
c9e9f97b | 3483 | |
837d5b6e | 3484 | atomic_inc(&fs_info->balance_running); |
c9e9f97b ID |
3485 | mutex_unlock(&fs_info->balance_mutex); |
3486 | ||
3487 | ret = __btrfs_balance(fs_info); | |
3488 | ||
3489 | mutex_lock(&fs_info->balance_mutex); | |
837d5b6e | 3490 | atomic_dec(&fs_info->balance_running); |
c9e9f97b | 3491 | |
bf023ecf ID |
3492 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { |
3493 | fs_info->num_tolerated_disk_barrier_failures = | |
3494 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); | |
3495 | } | |
3496 | ||
c9e9f97b ID |
3497 | if (bargs) { |
3498 | memset(bargs, 0, sizeof(*bargs)); | |
19a39dce | 3499 | update_ioctl_balance_args(fs_info, 0, bargs); |
c9e9f97b ID |
3500 | } |
3501 | ||
3a01aa7a ID |
3502 | if ((ret && ret != -ECANCELED && ret != -ENOSPC) || |
3503 | balance_need_close(fs_info)) { | |
3504 | __cancel_balance(fs_info); | |
3505 | } | |
3506 | ||
837d5b6e | 3507 | wake_up(&fs_info->balance_wait_q); |
c9e9f97b ID |
3508 | |
3509 | return ret; | |
3510 | out: | |
59641015 ID |
3511 | if (bctl->flags & BTRFS_BALANCE_RESUME) |
3512 | __cancel_balance(fs_info); | |
ed0fb78f | 3513 | else { |
59641015 | 3514 | kfree(bctl); |
ed0fb78f ID |
3515 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); |
3516 | } | |
59641015 ID |
3517 | return ret; |
3518 | } | |
3519 | ||
3520 | static int balance_kthread(void *data) | |
3521 | { | |
2b6ba629 | 3522 | struct btrfs_fs_info *fs_info = data; |
9555c6c1 | 3523 | int ret = 0; |
59641015 ID |
3524 | |
3525 | mutex_lock(&fs_info->volume_mutex); | |
3526 | mutex_lock(&fs_info->balance_mutex); | |
3527 | ||
2b6ba629 | 3528 | if (fs_info->balance_ctl) { |
efe120a0 | 3529 | btrfs_info(fs_info, "continuing balance"); |
2b6ba629 | 3530 | ret = btrfs_balance(fs_info->balance_ctl, NULL); |
9555c6c1 | 3531 | } |
59641015 ID |
3532 | |
3533 | mutex_unlock(&fs_info->balance_mutex); | |
3534 | mutex_unlock(&fs_info->volume_mutex); | |
2b6ba629 | 3535 | |
59641015 ID |
3536 | return ret; |
3537 | } | |
3538 | ||
2b6ba629 ID |
3539 | int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info) |
3540 | { | |
3541 | struct task_struct *tsk; | |
3542 | ||
3543 | spin_lock(&fs_info->balance_lock); | |
3544 | if (!fs_info->balance_ctl) { | |
3545 | spin_unlock(&fs_info->balance_lock); | |
3546 | return 0; | |
3547 | } | |
3548 | spin_unlock(&fs_info->balance_lock); | |
3549 | ||
3550 | if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) { | |
efe120a0 | 3551 | btrfs_info(fs_info, "force skipping balance"); |
2b6ba629 ID |
3552 | return 0; |
3553 | } | |
3554 | ||
3555 | tsk = kthread_run(balance_kthread, fs_info, "btrfs-balance"); | |
cd633972 | 3556 | return PTR_ERR_OR_ZERO(tsk); |
2b6ba629 ID |
3557 | } |
3558 | ||
68310a5e | 3559 | int btrfs_recover_balance(struct btrfs_fs_info *fs_info) |
59641015 | 3560 | { |
59641015 ID |
3561 | struct btrfs_balance_control *bctl; |
3562 | struct btrfs_balance_item *item; | |
3563 | struct btrfs_disk_balance_args disk_bargs; | |
3564 | struct btrfs_path *path; | |
3565 | struct extent_buffer *leaf; | |
3566 | struct btrfs_key key; | |
3567 | int ret; | |
3568 | ||
3569 | path = btrfs_alloc_path(); | |
3570 | if (!path) | |
3571 | return -ENOMEM; | |
3572 | ||
59641015 ID |
3573 | key.objectid = BTRFS_BALANCE_OBJECTID; |
3574 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
3575 | key.offset = 0; | |
3576 | ||
68310a5e | 3577 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
59641015 | 3578 | if (ret < 0) |
68310a5e | 3579 | goto out; |
59641015 ID |
3580 | if (ret > 0) { /* ret = -ENOENT; */ |
3581 | ret = 0; | |
68310a5e ID |
3582 | goto out; |
3583 | } | |
3584 | ||
3585 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); | |
3586 | if (!bctl) { | |
3587 | ret = -ENOMEM; | |
3588 | goto out; | |
59641015 ID |
3589 | } |
3590 | ||
3591 | leaf = path->nodes[0]; | |
3592 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
3593 | ||
68310a5e ID |
3594 | bctl->fs_info = fs_info; |
3595 | bctl->flags = btrfs_balance_flags(leaf, item); | |
3596 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
59641015 ID |
3597 | |
3598 | btrfs_balance_data(leaf, item, &disk_bargs); | |
3599 | btrfs_disk_balance_args_to_cpu(&bctl->data, &disk_bargs); | |
3600 | btrfs_balance_meta(leaf, item, &disk_bargs); | |
3601 | btrfs_disk_balance_args_to_cpu(&bctl->meta, &disk_bargs); | |
3602 | btrfs_balance_sys(leaf, item, &disk_bargs); | |
3603 | btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs); | |
3604 | ||
ed0fb78f ID |
3605 | WARN_ON(atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)); |
3606 | ||
68310a5e ID |
3607 | mutex_lock(&fs_info->volume_mutex); |
3608 | mutex_lock(&fs_info->balance_mutex); | |
59641015 | 3609 | |
68310a5e ID |
3610 | set_balance_control(bctl); |
3611 | ||
3612 | mutex_unlock(&fs_info->balance_mutex); | |
3613 | mutex_unlock(&fs_info->volume_mutex); | |
59641015 ID |
3614 | out: |
3615 | btrfs_free_path(path); | |
ec44a35c CM |
3616 | return ret; |
3617 | } | |
3618 | ||
837d5b6e ID |
3619 | int btrfs_pause_balance(struct btrfs_fs_info *fs_info) |
3620 | { | |
3621 | int ret = 0; | |
3622 | ||
3623 | mutex_lock(&fs_info->balance_mutex); | |
3624 | if (!fs_info->balance_ctl) { | |
3625 | mutex_unlock(&fs_info->balance_mutex); | |
3626 | return -ENOTCONN; | |
3627 | } | |
3628 | ||
3629 | if (atomic_read(&fs_info->balance_running)) { | |
3630 | atomic_inc(&fs_info->balance_pause_req); | |
3631 | mutex_unlock(&fs_info->balance_mutex); | |
3632 | ||
3633 | wait_event(fs_info->balance_wait_q, | |
3634 | atomic_read(&fs_info->balance_running) == 0); | |
3635 | ||
3636 | mutex_lock(&fs_info->balance_mutex); | |
3637 | /* we are good with balance_ctl ripped off from under us */ | |
3638 | BUG_ON(atomic_read(&fs_info->balance_running)); | |
3639 | atomic_dec(&fs_info->balance_pause_req); | |
3640 | } else { | |
3641 | ret = -ENOTCONN; | |
3642 | } | |
3643 | ||
3644 | mutex_unlock(&fs_info->balance_mutex); | |
3645 | return ret; | |
3646 | } | |
3647 | ||
a7e99c69 ID |
3648 | int btrfs_cancel_balance(struct btrfs_fs_info *fs_info) |
3649 | { | |
e649e587 ID |
3650 | if (fs_info->sb->s_flags & MS_RDONLY) |
3651 | return -EROFS; | |
3652 | ||
a7e99c69 ID |
3653 | mutex_lock(&fs_info->balance_mutex); |
3654 | if (!fs_info->balance_ctl) { | |
3655 | mutex_unlock(&fs_info->balance_mutex); | |
3656 | return -ENOTCONN; | |
3657 | } | |
3658 | ||
3659 | atomic_inc(&fs_info->balance_cancel_req); | |
3660 | /* | |
3661 | * if we are running just wait and return, balance item is | |
3662 | * deleted in btrfs_balance in this case | |
3663 | */ | |
3664 | if (atomic_read(&fs_info->balance_running)) { | |
3665 | mutex_unlock(&fs_info->balance_mutex); | |
3666 | wait_event(fs_info->balance_wait_q, | |
3667 | atomic_read(&fs_info->balance_running) == 0); | |
3668 | mutex_lock(&fs_info->balance_mutex); | |
3669 | } else { | |
3670 | /* __cancel_balance needs volume_mutex */ | |
3671 | mutex_unlock(&fs_info->balance_mutex); | |
3672 | mutex_lock(&fs_info->volume_mutex); | |
3673 | mutex_lock(&fs_info->balance_mutex); | |
3674 | ||
3675 | if (fs_info->balance_ctl) | |
3676 | __cancel_balance(fs_info); | |
3677 | ||
3678 | mutex_unlock(&fs_info->volume_mutex); | |
3679 | } | |
3680 | ||
3681 | BUG_ON(fs_info->balance_ctl || atomic_read(&fs_info->balance_running)); | |
3682 | atomic_dec(&fs_info->balance_cancel_req); | |
3683 | mutex_unlock(&fs_info->balance_mutex); | |
3684 | return 0; | |
3685 | } | |
3686 | ||
803b2f54 SB |
3687 | static int btrfs_uuid_scan_kthread(void *data) |
3688 | { | |
3689 | struct btrfs_fs_info *fs_info = data; | |
3690 | struct btrfs_root *root = fs_info->tree_root; | |
3691 | struct btrfs_key key; | |
3692 | struct btrfs_key max_key; | |
3693 | struct btrfs_path *path = NULL; | |
3694 | int ret = 0; | |
3695 | struct extent_buffer *eb; | |
3696 | int slot; | |
3697 | struct btrfs_root_item root_item; | |
3698 | u32 item_size; | |
f45388f3 | 3699 | struct btrfs_trans_handle *trans = NULL; |
803b2f54 SB |
3700 | |
3701 | path = btrfs_alloc_path(); | |
3702 | if (!path) { | |
3703 | ret = -ENOMEM; | |
3704 | goto out; | |
3705 | } | |
3706 | ||
3707 | key.objectid = 0; | |
3708 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3709 | key.offset = 0; | |
3710 | ||
3711 | max_key.objectid = (u64)-1; | |
3712 | max_key.type = BTRFS_ROOT_ITEM_KEY; | |
3713 | max_key.offset = (u64)-1; | |
3714 | ||
803b2f54 | 3715 | while (1) { |
6174d3cb | 3716 | ret = btrfs_search_forward(root, &key, path, 0); |
803b2f54 SB |
3717 | if (ret) { |
3718 | if (ret > 0) | |
3719 | ret = 0; | |
3720 | break; | |
3721 | } | |
3722 | ||
3723 | if (key.type != BTRFS_ROOT_ITEM_KEY || | |
3724 | (key.objectid < BTRFS_FIRST_FREE_OBJECTID && | |
3725 | key.objectid != BTRFS_FS_TREE_OBJECTID) || | |
3726 | key.objectid > BTRFS_LAST_FREE_OBJECTID) | |
3727 | goto skip; | |
3728 | ||
3729 | eb = path->nodes[0]; | |
3730 | slot = path->slots[0]; | |
3731 | item_size = btrfs_item_size_nr(eb, slot); | |
3732 | if (item_size < sizeof(root_item)) | |
3733 | goto skip; | |
3734 | ||
803b2f54 SB |
3735 | read_extent_buffer(eb, &root_item, |
3736 | btrfs_item_ptr_offset(eb, slot), | |
3737 | (int)sizeof(root_item)); | |
3738 | if (btrfs_root_refs(&root_item) == 0) | |
3739 | goto skip; | |
f45388f3 FDBM |
3740 | |
3741 | if (!btrfs_is_empty_uuid(root_item.uuid) || | |
3742 | !btrfs_is_empty_uuid(root_item.received_uuid)) { | |
3743 | if (trans) | |
3744 | goto update_tree; | |
3745 | ||
3746 | btrfs_release_path(path); | |
803b2f54 SB |
3747 | /* |
3748 | * 1 - subvol uuid item | |
3749 | * 1 - received_subvol uuid item | |
3750 | */ | |
3751 | trans = btrfs_start_transaction(fs_info->uuid_root, 2); | |
3752 | if (IS_ERR(trans)) { | |
3753 | ret = PTR_ERR(trans); | |
3754 | break; | |
3755 | } | |
f45388f3 FDBM |
3756 | continue; |
3757 | } else { | |
3758 | goto skip; | |
3759 | } | |
3760 | update_tree: | |
3761 | if (!btrfs_is_empty_uuid(root_item.uuid)) { | |
803b2f54 SB |
3762 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, |
3763 | root_item.uuid, | |
3764 | BTRFS_UUID_KEY_SUBVOL, | |
3765 | key.objectid); | |
3766 | if (ret < 0) { | |
efe120a0 | 3767 | btrfs_warn(fs_info, "uuid_tree_add failed %d", |
803b2f54 | 3768 | ret); |
803b2f54 SB |
3769 | break; |
3770 | } | |
3771 | } | |
3772 | ||
3773 | if (!btrfs_is_empty_uuid(root_item.received_uuid)) { | |
803b2f54 SB |
3774 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, |
3775 | root_item.received_uuid, | |
3776 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
3777 | key.objectid); | |
3778 | if (ret < 0) { | |
efe120a0 | 3779 | btrfs_warn(fs_info, "uuid_tree_add failed %d", |
803b2f54 | 3780 | ret); |
803b2f54 SB |
3781 | break; |
3782 | } | |
3783 | } | |
3784 | ||
f45388f3 | 3785 | skip: |
803b2f54 SB |
3786 | if (trans) { |
3787 | ret = btrfs_end_transaction(trans, fs_info->uuid_root); | |
f45388f3 | 3788 | trans = NULL; |
803b2f54 SB |
3789 | if (ret) |
3790 | break; | |
3791 | } | |
3792 | ||
803b2f54 SB |
3793 | btrfs_release_path(path); |
3794 | if (key.offset < (u64)-1) { | |
3795 | key.offset++; | |
3796 | } else if (key.type < BTRFS_ROOT_ITEM_KEY) { | |
3797 | key.offset = 0; | |
3798 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3799 | } else if (key.objectid < (u64)-1) { | |
3800 | key.offset = 0; | |
3801 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3802 | key.objectid++; | |
3803 | } else { | |
3804 | break; | |
3805 | } | |
3806 | cond_resched(); | |
3807 | } | |
3808 | ||
3809 | out: | |
3810 | btrfs_free_path(path); | |
f45388f3 FDBM |
3811 | if (trans && !IS_ERR(trans)) |
3812 | btrfs_end_transaction(trans, fs_info->uuid_root); | |
803b2f54 | 3813 | if (ret) |
efe120a0 | 3814 | btrfs_warn(fs_info, "btrfs_uuid_scan_kthread failed %d", ret); |
70f80175 SB |
3815 | else |
3816 | fs_info->update_uuid_tree_gen = 1; | |
803b2f54 SB |
3817 | up(&fs_info->uuid_tree_rescan_sem); |
3818 | return 0; | |
3819 | } | |
3820 | ||
70f80175 SB |
3821 | /* |
3822 | * Callback for btrfs_uuid_tree_iterate(). | |
3823 | * returns: | |
3824 | * 0 check succeeded, the entry is not outdated. | |
3825 | * < 0 if an error occured. | |
3826 | * > 0 if the check failed, which means the caller shall remove the entry. | |
3827 | */ | |
3828 | static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info, | |
3829 | u8 *uuid, u8 type, u64 subid) | |
3830 | { | |
3831 | struct btrfs_key key; | |
3832 | int ret = 0; | |
3833 | struct btrfs_root *subvol_root; | |
3834 | ||
3835 | if (type != BTRFS_UUID_KEY_SUBVOL && | |
3836 | type != BTRFS_UUID_KEY_RECEIVED_SUBVOL) | |
3837 | goto out; | |
3838 | ||
3839 | key.objectid = subid; | |
3840 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3841 | key.offset = (u64)-1; | |
3842 | subvol_root = btrfs_read_fs_root_no_name(fs_info, &key); | |
3843 | if (IS_ERR(subvol_root)) { | |
3844 | ret = PTR_ERR(subvol_root); | |
3845 | if (ret == -ENOENT) | |
3846 | ret = 1; | |
3847 | goto out; | |
3848 | } | |
3849 | ||
3850 | switch (type) { | |
3851 | case BTRFS_UUID_KEY_SUBVOL: | |
3852 | if (memcmp(uuid, subvol_root->root_item.uuid, BTRFS_UUID_SIZE)) | |
3853 | ret = 1; | |
3854 | break; | |
3855 | case BTRFS_UUID_KEY_RECEIVED_SUBVOL: | |
3856 | if (memcmp(uuid, subvol_root->root_item.received_uuid, | |
3857 | BTRFS_UUID_SIZE)) | |
3858 | ret = 1; | |
3859 | break; | |
3860 | } | |
3861 | ||
3862 | out: | |
3863 | return ret; | |
3864 | } | |
3865 | ||
3866 | static int btrfs_uuid_rescan_kthread(void *data) | |
3867 | { | |
3868 | struct btrfs_fs_info *fs_info = (struct btrfs_fs_info *)data; | |
3869 | int ret; | |
3870 | ||
3871 | /* | |
3872 | * 1st step is to iterate through the existing UUID tree and | |
3873 | * to delete all entries that contain outdated data. | |
3874 | * 2nd step is to add all missing entries to the UUID tree. | |
3875 | */ | |
3876 | ret = btrfs_uuid_tree_iterate(fs_info, btrfs_check_uuid_tree_entry); | |
3877 | if (ret < 0) { | |
efe120a0 | 3878 | btrfs_warn(fs_info, "iterating uuid_tree failed %d", ret); |
70f80175 SB |
3879 | up(&fs_info->uuid_tree_rescan_sem); |
3880 | return ret; | |
3881 | } | |
3882 | return btrfs_uuid_scan_kthread(data); | |
3883 | } | |
3884 | ||
f7a81ea4 SB |
3885 | int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info) |
3886 | { | |
3887 | struct btrfs_trans_handle *trans; | |
3888 | struct btrfs_root *tree_root = fs_info->tree_root; | |
3889 | struct btrfs_root *uuid_root; | |
803b2f54 SB |
3890 | struct task_struct *task; |
3891 | int ret; | |
f7a81ea4 SB |
3892 | |
3893 | /* | |
3894 | * 1 - root node | |
3895 | * 1 - root item | |
3896 | */ | |
3897 | trans = btrfs_start_transaction(tree_root, 2); | |
3898 | if (IS_ERR(trans)) | |
3899 | return PTR_ERR(trans); | |
3900 | ||
3901 | uuid_root = btrfs_create_tree(trans, fs_info, | |
3902 | BTRFS_UUID_TREE_OBJECTID); | |
3903 | if (IS_ERR(uuid_root)) { | |
3904 | btrfs_abort_transaction(trans, tree_root, | |
3905 | PTR_ERR(uuid_root)); | |
3906 | return PTR_ERR(uuid_root); | |
3907 | } | |
3908 | ||
3909 | fs_info->uuid_root = uuid_root; | |
3910 | ||
803b2f54 SB |
3911 | ret = btrfs_commit_transaction(trans, tree_root); |
3912 | if (ret) | |
3913 | return ret; | |
3914 | ||
3915 | down(&fs_info->uuid_tree_rescan_sem); | |
3916 | task = kthread_run(btrfs_uuid_scan_kthread, fs_info, "btrfs-uuid"); | |
3917 | if (IS_ERR(task)) { | |
70f80175 | 3918 | /* fs_info->update_uuid_tree_gen remains 0 in all error case */ |
efe120a0 | 3919 | btrfs_warn(fs_info, "failed to start uuid_scan task"); |
803b2f54 SB |
3920 | up(&fs_info->uuid_tree_rescan_sem); |
3921 | return PTR_ERR(task); | |
3922 | } | |
3923 | ||
3924 | return 0; | |
f7a81ea4 | 3925 | } |
803b2f54 | 3926 | |
70f80175 SB |
3927 | int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info) |
3928 | { | |
3929 | struct task_struct *task; | |
3930 | ||
3931 | down(&fs_info->uuid_tree_rescan_sem); | |
3932 | task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid"); | |
3933 | if (IS_ERR(task)) { | |
3934 | /* fs_info->update_uuid_tree_gen remains 0 in all error case */ | |
efe120a0 | 3935 | btrfs_warn(fs_info, "failed to start uuid_rescan task"); |
70f80175 SB |
3936 | up(&fs_info->uuid_tree_rescan_sem); |
3937 | return PTR_ERR(task); | |
3938 | } | |
3939 | ||
3940 | return 0; | |
3941 | } | |
3942 | ||
8f18cf13 CM |
3943 | /* |
3944 | * shrinking a device means finding all of the device extents past | |
3945 | * the new size, and then following the back refs to the chunks. | |
3946 | * The chunk relocation code actually frees the device extent | |
3947 | */ | |
3948 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
3949 | { | |
3950 | struct btrfs_trans_handle *trans; | |
3951 | struct btrfs_root *root = device->dev_root; | |
3952 | struct btrfs_dev_extent *dev_extent = NULL; | |
3953 | struct btrfs_path *path; | |
3954 | u64 length; | |
8f18cf13 CM |
3955 | u64 chunk_objectid; |
3956 | u64 chunk_offset; | |
3957 | int ret; | |
3958 | int slot; | |
ba1bf481 JB |
3959 | int failed = 0; |
3960 | bool retried = false; | |
8f18cf13 CM |
3961 | struct extent_buffer *l; |
3962 | struct btrfs_key key; | |
6c41761f | 3963 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 | 3964 | u64 old_total = btrfs_super_total_bytes(super_copy); |
7cc8e58d MX |
3965 | u64 old_size = btrfs_device_get_total_bytes(device); |
3966 | u64 diff = old_size - new_size; | |
8f18cf13 | 3967 | |
63a212ab SB |
3968 | if (device->is_tgtdev_for_dev_replace) |
3969 | return -EINVAL; | |
3970 | ||
8f18cf13 CM |
3971 | path = btrfs_alloc_path(); |
3972 | if (!path) | |
3973 | return -ENOMEM; | |
3974 | ||
8f18cf13 CM |
3975 | path->reada = 2; |
3976 | ||
7d9eb12c CM |
3977 | lock_chunks(root); |
3978 | ||
7cc8e58d | 3979 | btrfs_device_set_total_bytes(device, new_size); |
2bf64758 | 3980 | if (device->writeable) { |
2b82032c | 3981 | device->fs_devices->total_rw_bytes -= diff; |
2bf64758 JB |
3982 | spin_lock(&root->fs_info->free_chunk_lock); |
3983 | root->fs_info->free_chunk_space -= diff; | |
3984 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3985 | } | |
7d9eb12c | 3986 | unlock_chunks(root); |
8f18cf13 | 3987 | |
ba1bf481 | 3988 | again: |
8f18cf13 CM |
3989 | key.objectid = device->devid; |
3990 | key.offset = (u64)-1; | |
3991 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3992 | ||
213e64da | 3993 | do { |
8f18cf13 CM |
3994 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
3995 | if (ret < 0) | |
3996 | goto done; | |
3997 | ||
3998 | ret = btrfs_previous_item(root, path, 0, key.type); | |
3999 | if (ret < 0) | |
4000 | goto done; | |
4001 | if (ret) { | |
4002 | ret = 0; | |
b3b4aa74 | 4003 | btrfs_release_path(path); |
bf1fb512 | 4004 | break; |
8f18cf13 CM |
4005 | } |
4006 | ||
4007 | l = path->nodes[0]; | |
4008 | slot = path->slots[0]; | |
4009 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
4010 | ||
ba1bf481 | 4011 | if (key.objectid != device->devid) { |
b3b4aa74 | 4012 | btrfs_release_path(path); |
bf1fb512 | 4013 | break; |
ba1bf481 | 4014 | } |
8f18cf13 CM |
4015 | |
4016 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
4017 | length = btrfs_dev_extent_length(l, dev_extent); | |
4018 | ||
ba1bf481 | 4019 | if (key.offset + length <= new_size) { |
b3b4aa74 | 4020 | btrfs_release_path(path); |
d6397bae | 4021 | break; |
ba1bf481 | 4022 | } |
8f18cf13 | 4023 | |
8f18cf13 CM |
4024 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); |
4025 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
b3b4aa74 | 4026 | btrfs_release_path(path); |
8f18cf13 | 4027 | |
a688a04a | 4028 | ret = btrfs_relocate_chunk(root, chunk_objectid, chunk_offset); |
ba1bf481 | 4029 | if (ret && ret != -ENOSPC) |
8f18cf13 | 4030 | goto done; |
ba1bf481 JB |
4031 | if (ret == -ENOSPC) |
4032 | failed++; | |
213e64da | 4033 | } while (key.offset-- > 0); |
ba1bf481 JB |
4034 | |
4035 | if (failed && !retried) { | |
4036 | failed = 0; | |
4037 | retried = true; | |
4038 | goto again; | |
4039 | } else if (failed && retried) { | |
4040 | ret = -ENOSPC; | |
4041 | lock_chunks(root); | |
4042 | ||
7cc8e58d | 4043 | btrfs_device_set_total_bytes(device, old_size); |
ba1bf481 JB |
4044 | if (device->writeable) |
4045 | device->fs_devices->total_rw_bytes += diff; | |
2bf64758 JB |
4046 | spin_lock(&root->fs_info->free_chunk_lock); |
4047 | root->fs_info->free_chunk_space += diff; | |
4048 | spin_unlock(&root->fs_info->free_chunk_lock); | |
ba1bf481 JB |
4049 | unlock_chunks(root); |
4050 | goto done; | |
8f18cf13 CM |
4051 | } |
4052 | ||
d6397bae | 4053 | /* Shrinking succeeded, else we would be at "done". */ |
a22285a6 | 4054 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
4055 | if (IS_ERR(trans)) { |
4056 | ret = PTR_ERR(trans); | |
4057 | goto done; | |
4058 | } | |
4059 | ||
d6397bae | 4060 | lock_chunks(root); |
7cc8e58d | 4061 | btrfs_device_set_disk_total_bytes(device, new_size); |
935e5cc9 MX |
4062 | if (list_empty(&device->resized_list)) |
4063 | list_add_tail(&device->resized_list, | |
4064 | &root->fs_info->fs_devices->resized_devices); | |
d6397bae | 4065 | |
d6397bae CB |
4066 | WARN_ON(diff > old_total); |
4067 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
4068 | unlock_chunks(root); | |
2196d6e8 MX |
4069 | |
4070 | /* Now btrfs_update_device() will change the on-disk size. */ | |
4071 | ret = btrfs_update_device(trans, device); | |
d6397bae | 4072 | btrfs_end_transaction(trans, root); |
8f18cf13 CM |
4073 | done: |
4074 | btrfs_free_path(path); | |
4075 | return ret; | |
4076 | } | |
4077 | ||
125ccb0a | 4078 | static int btrfs_add_system_chunk(struct btrfs_root *root, |
0b86a832 CM |
4079 | struct btrfs_key *key, |
4080 | struct btrfs_chunk *chunk, int item_size) | |
4081 | { | |
6c41761f | 4082 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
0b86a832 CM |
4083 | struct btrfs_disk_key disk_key; |
4084 | u32 array_size; | |
4085 | u8 *ptr; | |
4086 | ||
fe48a5c0 | 4087 | lock_chunks(root); |
0b86a832 | 4088 | array_size = btrfs_super_sys_array_size(super_copy); |
5f43f86e | 4089 | if (array_size + item_size + sizeof(disk_key) |
fe48a5c0 MX |
4090 | > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) { |
4091 | unlock_chunks(root); | |
0b86a832 | 4092 | return -EFBIG; |
fe48a5c0 | 4093 | } |
0b86a832 CM |
4094 | |
4095 | ptr = super_copy->sys_chunk_array + array_size; | |
4096 | btrfs_cpu_key_to_disk(&disk_key, key); | |
4097 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
4098 | ptr += sizeof(disk_key); | |
4099 | memcpy(ptr, chunk, item_size); | |
4100 | item_size += sizeof(disk_key); | |
4101 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
fe48a5c0 MX |
4102 | unlock_chunks(root); |
4103 | ||
0b86a832 CM |
4104 | return 0; |
4105 | } | |
4106 | ||
73c5de00 AJ |
4107 | /* |
4108 | * sort the devices in descending order by max_avail, total_avail | |
4109 | */ | |
4110 | static int btrfs_cmp_device_info(const void *a, const void *b) | |
9b3f68b9 | 4111 | { |
73c5de00 AJ |
4112 | const struct btrfs_device_info *di_a = a; |
4113 | const struct btrfs_device_info *di_b = b; | |
9b3f68b9 | 4114 | |
73c5de00 | 4115 | if (di_a->max_avail > di_b->max_avail) |
b2117a39 | 4116 | return -1; |
73c5de00 | 4117 | if (di_a->max_avail < di_b->max_avail) |
b2117a39 | 4118 | return 1; |
73c5de00 AJ |
4119 | if (di_a->total_avail > di_b->total_avail) |
4120 | return -1; | |
4121 | if (di_a->total_avail < di_b->total_avail) | |
4122 | return 1; | |
4123 | return 0; | |
b2117a39 | 4124 | } |
0b86a832 | 4125 | |
e8c9f186 | 4126 | static const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = { |
e6ec716f MX |
4127 | [BTRFS_RAID_RAID10] = { |
4128 | .sub_stripes = 2, | |
4129 | .dev_stripes = 1, | |
4130 | .devs_max = 0, /* 0 == as many as possible */ | |
4131 | .devs_min = 4, | |
4132 | .devs_increment = 2, | |
4133 | .ncopies = 2, | |
4134 | }, | |
4135 | [BTRFS_RAID_RAID1] = { | |
4136 | .sub_stripes = 1, | |
4137 | .dev_stripes = 1, | |
4138 | .devs_max = 2, | |
4139 | .devs_min = 2, | |
4140 | .devs_increment = 2, | |
4141 | .ncopies = 2, | |
4142 | }, | |
4143 | [BTRFS_RAID_DUP] = { | |
4144 | .sub_stripes = 1, | |
4145 | .dev_stripes = 2, | |
4146 | .devs_max = 1, | |
4147 | .devs_min = 1, | |
4148 | .devs_increment = 1, | |
4149 | .ncopies = 2, | |
4150 | }, | |
4151 | [BTRFS_RAID_RAID0] = { | |
4152 | .sub_stripes = 1, | |
4153 | .dev_stripes = 1, | |
4154 | .devs_max = 0, | |
4155 | .devs_min = 2, | |
4156 | .devs_increment = 1, | |
4157 | .ncopies = 1, | |
4158 | }, | |
4159 | [BTRFS_RAID_SINGLE] = { | |
4160 | .sub_stripes = 1, | |
4161 | .dev_stripes = 1, | |
4162 | .devs_max = 1, | |
4163 | .devs_min = 1, | |
4164 | .devs_increment = 1, | |
4165 | .ncopies = 1, | |
4166 | }, | |
e942f883 CM |
4167 | [BTRFS_RAID_RAID5] = { |
4168 | .sub_stripes = 1, | |
4169 | .dev_stripes = 1, | |
4170 | .devs_max = 0, | |
4171 | .devs_min = 2, | |
4172 | .devs_increment = 1, | |
4173 | .ncopies = 2, | |
4174 | }, | |
4175 | [BTRFS_RAID_RAID6] = { | |
4176 | .sub_stripes = 1, | |
4177 | .dev_stripes = 1, | |
4178 | .devs_max = 0, | |
4179 | .devs_min = 3, | |
4180 | .devs_increment = 1, | |
4181 | .ncopies = 3, | |
4182 | }, | |
31e50229 LB |
4183 | }; |
4184 | ||
53b381b3 DW |
4185 | static u32 find_raid56_stripe_len(u32 data_devices, u32 dev_stripe_target) |
4186 | { | |
4187 | /* TODO allow them to set a preferred stripe size */ | |
4188 | return 64 * 1024; | |
4189 | } | |
4190 | ||
4191 | static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type) | |
4192 | { | |
ffe2d203 | 4193 | if (!(type & BTRFS_BLOCK_GROUP_RAID56_MASK)) |
53b381b3 DW |
4194 | return; |
4195 | ||
ceda0864 | 4196 | btrfs_set_fs_incompat(info, RAID56); |
53b381b3 DW |
4197 | } |
4198 | ||
23f8f9b7 GH |
4199 | #define BTRFS_MAX_DEVS(r) ((BTRFS_LEAF_DATA_SIZE(r) \ |
4200 | - sizeof(struct btrfs_item) \ | |
4201 | - sizeof(struct btrfs_chunk)) \ | |
4202 | / sizeof(struct btrfs_stripe) + 1) | |
4203 | ||
4204 | #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \ | |
4205 | - 2 * sizeof(struct btrfs_disk_key) \ | |
4206 | - 2 * sizeof(struct btrfs_chunk)) \ | |
4207 | / sizeof(struct btrfs_stripe) + 1) | |
4208 | ||
73c5de00 | 4209 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
6df9a95e JB |
4210 | struct btrfs_root *extent_root, u64 start, |
4211 | u64 type) | |
b2117a39 | 4212 | { |
73c5de00 AJ |
4213 | struct btrfs_fs_info *info = extent_root->fs_info; |
4214 | struct btrfs_fs_devices *fs_devices = info->fs_devices; | |
4215 | struct list_head *cur; | |
4216 | struct map_lookup *map = NULL; | |
4217 | struct extent_map_tree *em_tree; | |
4218 | struct extent_map *em; | |
4219 | struct btrfs_device_info *devices_info = NULL; | |
4220 | u64 total_avail; | |
4221 | int num_stripes; /* total number of stripes to allocate */ | |
53b381b3 DW |
4222 | int data_stripes; /* number of stripes that count for |
4223 | block group size */ | |
73c5de00 AJ |
4224 | int sub_stripes; /* sub_stripes info for map */ |
4225 | int dev_stripes; /* stripes per dev */ | |
4226 | int devs_max; /* max devs to use */ | |
4227 | int devs_min; /* min devs needed */ | |
4228 | int devs_increment; /* ndevs has to be a multiple of this */ | |
4229 | int ncopies; /* how many copies to data has */ | |
4230 | int ret; | |
4231 | u64 max_stripe_size; | |
4232 | u64 max_chunk_size; | |
4233 | u64 stripe_size; | |
4234 | u64 num_bytes; | |
53b381b3 | 4235 | u64 raid_stripe_len = BTRFS_STRIPE_LEN; |
73c5de00 AJ |
4236 | int ndevs; |
4237 | int i; | |
4238 | int j; | |
31e50229 | 4239 | int index; |
593060d7 | 4240 | |
0c460c0d | 4241 | BUG_ON(!alloc_profile_is_valid(type, 0)); |
9b3f68b9 | 4242 | |
73c5de00 AJ |
4243 | if (list_empty(&fs_devices->alloc_list)) |
4244 | return -ENOSPC; | |
b2117a39 | 4245 | |
31e50229 | 4246 | index = __get_raid_index(type); |
73c5de00 | 4247 | |
31e50229 LB |
4248 | sub_stripes = btrfs_raid_array[index].sub_stripes; |
4249 | dev_stripes = btrfs_raid_array[index].dev_stripes; | |
4250 | devs_max = btrfs_raid_array[index].devs_max; | |
4251 | devs_min = btrfs_raid_array[index].devs_min; | |
4252 | devs_increment = btrfs_raid_array[index].devs_increment; | |
4253 | ncopies = btrfs_raid_array[index].ncopies; | |
b2117a39 | 4254 | |
9b3f68b9 | 4255 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
73c5de00 AJ |
4256 | max_stripe_size = 1024 * 1024 * 1024; |
4257 | max_chunk_size = 10 * max_stripe_size; | |
23f8f9b7 GH |
4258 | if (!devs_max) |
4259 | devs_max = BTRFS_MAX_DEVS(info->chunk_root); | |
9b3f68b9 | 4260 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
1100373f CM |
4261 | /* for larger filesystems, use larger metadata chunks */ |
4262 | if (fs_devices->total_rw_bytes > 50ULL * 1024 * 1024 * 1024) | |
4263 | max_stripe_size = 1024 * 1024 * 1024; | |
4264 | else | |
4265 | max_stripe_size = 256 * 1024 * 1024; | |
73c5de00 | 4266 | max_chunk_size = max_stripe_size; |
23f8f9b7 GH |
4267 | if (!devs_max) |
4268 | devs_max = BTRFS_MAX_DEVS(info->chunk_root); | |
a40a90a0 | 4269 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
96bdc7dc | 4270 | max_stripe_size = 32 * 1024 * 1024; |
73c5de00 | 4271 | max_chunk_size = 2 * max_stripe_size; |
23f8f9b7 GH |
4272 | if (!devs_max) |
4273 | devs_max = BTRFS_MAX_DEVS_SYS_CHUNK; | |
73c5de00 | 4274 | } else { |
351fd353 | 4275 | btrfs_err(info, "invalid chunk type 0x%llx requested", |
73c5de00 AJ |
4276 | type); |
4277 | BUG_ON(1); | |
9b3f68b9 CM |
4278 | } |
4279 | ||
2b82032c YZ |
4280 | /* we don't want a chunk larger than 10% of writeable space */ |
4281 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
4282 | max_chunk_size); | |
9b3f68b9 | 4283 | |
73c5de00 AJ |
4284 | devices_info = kzalloc(sizeof(*devices_info) * fs_devices->rw_devices, |
4285 | GFP_NOFS); | |
4286 | if (!devices_info) | |
4287 | return -ENOMEM; | |
0cad8a11 | 4288 | |
73c5de00 | 4289 | cur = fs_devices->alloc_list.next; |
9b3f68b9 | 4290 | |
9f680ce0 | 4291 | /* |
73c5de00 AJ |
4292 | * in the first pass through the devices list, we gather information |
4293 | * about the available holes on each device. | |
9f680ce0 | 4294 | */ |
73c5de00 AJ |
4295 | ndevs = 0; |
4296 | while (cur != &fs_devices->alloc_list) { | |
4297 | struct btrfs_device *device; | |
4298 | u64 max_avail; | |
4299 | u64 dev_offset; | |
b2117a39 | 4300 | |
73c5de00 | 4301 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
9f680ce0 | 4302 | |
73c5de00 | 4303 | cur = cur->next; |
b2117a39 | 4304 | |
73c5de00 | 4305 | if (!device->writeable) { |
31b1a2bd | 4306 | WARN(1, KERN_ERR |
efe120a0 | 4307 | "BTRFS: read-only device in alloc_list\n"); |
73c5de00 AJ |
4308 | continue; |
4309 | } | |
b2117a39 | 4310 | |
63a212ab SB |
4311 | if (!device->in_fs_metadata || |
4312 | device->is_tgtdev_for_dev_replace) | |
73c5de00 | 4313 | continue; |
b2117a39 | 4314 | |
73c5de00 AJ |
4315 | if (device->total_bytes > device->bytes_used) |
4316 | total_avail = device->total_bytes - device->bytes_used; | |
4317 | else | |
4318 | total_avail = 0; | |
38c01b96 | 4319 | |
4320 | /* If there is no space on this device, skip it. */ | |
4321 | if (total_avail == 0) | |
4322 | continue; | |
b2117a39 | 4323 | |
6df9a95e | 4324 | ret = find_free_dev_extent(trans, device, |
73c5de00 AJ |
4325 | max_stripe_size * dev_stripes, |
4326 | &dev_offset, &max_avail); | |
4327 | if (ret && ret != -ENOSPC) | |
4328 | goto error; | |
b2117a39 | 4329 | |
73c5de00 AJ |
4330 | if (ret == 0) |
4331 | max_avail = max_stripe_size * dev_stripes; | |
b2117a39 | 4332 | |
73c5de00 AJ |
4333 | if (max_avail < BTRFS_STRIPE_LEN * dev_stripes) |
4334 | continue; | |
b2117a39 | 4335 | |
063d006f ES |
4336 | if (ndevs == fs_devices->rw_devices) { |
4337 | WARN(1, "%s: found more than %llu devices\n", | |
4338 | __func__, fs_devices->rw_devices); | |
4339 | break; | |
4340 | } | |
73c5de00 AJ |
4341 | devices_info[ndevs].dev_offset = dev_offset; |
4342 | devices_info[ndevs].max_avail = max_avail; | |
4343 | devices_info[ndevs].total_avail = total_avail; | |
4344 | devices_info[ndevs].dev = device; | |
4345 | ++ndevs; | |
4346 | } | |
b2117a39 | 4347 | |
73c5de00 AJ |
4348 | /* |
4349 | * now sort the devices by hole size / available space | |
4350 | */ | |
4351 | sort(devices_info, ndevs, sizeof(struct btrfs_device_info), | |
4352 | btrfs_cmp_device_info, NULL); | |
b2117a39 | 4353 | |
73c5de00 AJ |
4354 | /* round down to number of usable stripes */ |
4355 | ndevs -= ndevs % devs_increment; | |
b2117a39 | 4356 | |
73c5de00 AJ |
4357 | if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) { |
4358 | ret = -ENOSPC; | |
4359 | goto error; | |
b2117a39 | 4360 | } |
9f680ce0 | 4361 | |
73c5de00 AJ |
4362 | if (devs_max && ndevs > devs_max) |
4363 | ndevs = devs_max; | |
4364 | /* | |
4365 | * the primary goal is to maximize the number of stripes, so use as many | |
4366 | * devices as possible, even if the stripes are not maximum sized. | |
4367 | */ | |
4368 | stripe_size = devices_info[ndevs-1].max_avail; | |
4369 | num_stripes = ndevs * dev_stripes; | |
b2117a39 | 4370 | |
53b381b3 DW |
4371 | /* |
4372 | * this will have to be fixed for RAID1 and RAID10 over | |
4373 | * more drives | |
4374 | */ | |
4375 | data_stripes = num_stripes / ncopies; | |
4376 | ||
53b381b3 DW |
4377 | if (type & BTRFS_BLOCK_GROUP_RAID5) { |
4378 | raid_stripe_len = find_raid56_stripe_len(ndevs - 1, | |
4379 | btrfs_super_stripesize(info->super_copy)); | |
4380 | data_stripes = num_stripes - 1; | |
4381 | } | |
4382 | if (type & BTRFS_BLOCK_GROUP_RAID6) { | |
4383 | raid_stripe_len = find_raid56_stripe_len(ndevs - 2, | |
4384 | btrfs_super_stripesize(info->super_copy)); | |
4385 | data_stripes = num_stripes - 2; | |
4386 | } | |
86db2578 CM |
4387 | |
4388 | /* | |
4389 | * Use the number of data stripes to figure out how big this chunk | |
4390 | * is really going to be in terms of logical address space, | |
4391 | * and compare that answer with the max chunk size | |
4392 | */ | |
4393 | if (stripe_size * data_stripes > max_chunk_size) { | |
4394 | u64 mask = (1ULL << 24) - 1; | |
4395 | stripe_size = max_chunk_size; | |
4396 | do_div(stripe_size, data_stripes); | |
4397 | ||
4398 | /* bump the answer up to a 16MB boundary */ | |
4399 | stripe_size = (stripe_size + mask) & ~mask; | |
4400 | ||
4401 | /* but don't go higher than the limits we found | |
4402 | * while searching for free extents | |
4403 | */ | |
4404 | if (stripe_size > devices_info[ndevs-1].max_avail) | |
4405 | stripe_size = devices_info[ndevs-1].max_avail; | |
4406 | } | |
4407 | ||
73c5de00 | 4408 | do_div(stripe_size, dev_stripes); |
37db63a4 ID |
4409 | |
4410 | /* align to BTRFS_STRIPE_LEN */ | |
53b381b3 DW |
4411 | do_div(stripe_size, raid_stripe_len); |
4412 | stripe_size *= raid_stripe_len; | |
b2117a39 MX |
4413 | |
4414 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
4415 | if (!map) { | |
4416 | ret = -ENOMEM; | |
4417 | goto error; | |
4418 | } | |
4419 | map->num_stripes = num_stripes; | |
9b3f68b9 | 4420 | |
73c5de00 AJ |
4421 | for (i = 0; i < ndevs; ++i) { |
4422 | for (j = 0; j < dev_stripes; ++j) { | |
4423 | int s = i * dev_stripes + j; | |
4424 | map->stripes[s].dev = devices_info[i].dev; | |
4425 | map->stripes[s].physical = devices_info[i].dev_offset + | |
4426 | j * stripe_size; | |
6324fbf3 | 4427 | } |
6324fbf3 | 4428 | } |
2b82032c | 4429 | map->sector_size = extent_root->sectorsize; |
53b381b3 DW |
4430 | map->stripe_len = raid_stripe_len; |
4431 | map->io_align = raid_stripe_len; | |
4432 | map->io_width = raid_stripe_len; | |
2b82032c | 4433 | map->type = type; |
2b82032c | 4434 | map->sub_stripes = sub_stripes; |
0b86a832 | 4435 | |
53b381b3 | 4436 | num_bytes = stripe_size * data_stripes; |
0b86a832 | 4437 | |
73c5de00 | 4438 | trace_btrfs_chunk_alloc(info->chunk_root, map, start, num_bytes); |
1abe9b8a | 4439 | |
172ddd60 | 4440 | em = alloc_extent_map(); |
2b82032c | 4441 | if (!em) { |
298a8f9c | 4442 | kfree(map); |
b2117a39 MX |
4443 | ret = -ENOMEM; |
4444 | goto error; | |
593060d7 | 4445 | } |
298a8f9c | 4446 | set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags); |
2b82032c YZ |
4447 | em->bdev = (struct block_device *)map; |
4448 | em->start = start; | |
73c5de00 | 4449 | em->len = num_bytes; |
2b82032c YZ |
4450 | em->block_start = 0; |
4451 | em->block_len = em->len; | |
6df9a95e | 4452 | em->orig_block_len = stripe_size; |
593060d7 | 4453 | |
2b82032c | 4454 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
890871be | 4455 | write_lock(&em_tree->lock); |
09a2a8f9 | 4456 | ret = add_extent_mapping(em_tree, em, 0); |
6df9a95e JB |
4457 | if (!ret) { |
4458 | list_add_tail(&em->list, &trans->transaction->pending_chunks); | |
4459 | atomic_inc(&em->refs); | |
4460 | } | |
890871be | 4461 | write_unlock(&em_tree->lock); |
0f5d42b2 JB |
4462 | if (ret) { |
4463 | free_extent_map(em); | |
1dd4602f | 4464 | goto error; |
0f5d42b2 | 4465 | } |
0b86a832 | 4466 | |
04487488 JB |
4467 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
4468 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
4469 | start, num_bytes); | |
6df9a95e JB |
4470 | if (ret) |
4471 | goto error_del_extent; | |
2b82032c | 4472 | |
7cc8e58d MX |
4473 | for (i = 0; i < map->num_stripes; i++) { |
4474 | num_bytes = map->stripes[i].dev->bytes_used + stripe_size; | |
4475 | btrfs_device_set_bytes_used(map->stripes[i].dev, num_bytes); | |
4476 | } | |
43530c46 | 4477 | |
1c116187 MX |
4478 | spin_lock(&extent_root->fs_info->free_chunk_lock); |
4479 | extent_root->fs_info->free_chunk_space -= (stripe_size * | |
4480 | map->num_stripes); | |
4481 | spin_unlock(&extent_root->fs_info->free_chunk_lock); | |
4482 | ||
0f5d42b2 | 4483 | free_extent_map(em); |
53b381b3 DW |
4484 | check_raid56_incompat_flag(extent_root->fs_info, type); |
4485 | ||
b2117a39 | 4486 | kfree(devices_info); |
2b82032c | 4487 | return 0; |
b2117a39 | 4488 | |
6df9a95e | 4489 | error_del_extent: |
0f5d42b2 JB |
4490 | write_lock(&em_tree->lock); |
4491 | remove_extent_mapping(em_tree, em); | |
4492 | write_unlock(&em_tree->lock); | |
4493 | ||
4494 | /* One for our allocation */ | |
4495 | free_extent_map(em); | |
4496 | /* One for the tree reference */ | |
4497 | free_extent_map(em); | |
495e64f4 FM |
4498 | /* One for the pending_chunks list reference */ |
4499 | free_extent_map(em); | |
b2117a39 | 4500 | error: |
b2117a39 MX |
4501 | kfree(devices_info); |
4502 | return ret; | |
2b82032c YZ |
4503 | } |
4504 | ||
6df9a95e | 4505 | int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, |
2b82032c | 4506 | struct btrfs_root *extent_root, |
6df9a95e | 4507 | u64 chunk_offset, u64 chunk_size) |
2b82032c | 4508 | { |
2b82032c YZ |
4509 | struct btrfs_key key; |
4510 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
4511 | struct btrfs_device *device; | |
4512 | struct btrfs_chunk *chunk; | |
4513 | struct btrfs_stripe *stripe; | |
6df9a95e JB |
4514 | struct extent_map_tree *em_tree; |
4515 | struct extent_map *em; | |
4516 | struct map_lookup *map; | |
4517 | size_t item_size; | |
4518 | u64 dev_offset; | |
4519 | u64 stripe_size; | |
4520 | int i = 0; | |
2b82032c YZ |
4521 | int ret; |
4522 | ||
6df9a95e JB |
4523 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
4524 | read_lock(&em_tree->lock); | |
4525 | em = lookup_extent_mapping(em_tree, chunk_offset, chunk_size); | |
4526 | read_unlock(&em_tree->lock); | |
4527 | ||
4528 | if (!em) { | |
4529 | btrfs_crit(extent_root->fs_info, "unable to find logical " | |
4530 | "%Lu len %Lu", chunk_offset, chunk_size); | |
4531 | return -EINVAL; | |
4532 | } | |
4533 | ||
4534 | if (em->start != chunk_offset || em->len != chunk_size) { | |
4535 | btrfs_crit(extent_root->fs_info, "found a bad mapping, wanted" | |
351fd353 | 4536 | " %Lu-%Lu, found %Lu-%Lu", chunk_offset, |
6df9a95e JB |
4537 | chunk_size, em->start, em->len); |
4538 | free_extent_map(em); | |
4539 | return -EINVAL; | |
4540 | } | |
4541 | ||
4542 | map = (struct map_lookup *)em->bdev; | |
4543 | item_size = btrfs_chunk_item_size(map->num_stripes); | |
4544 | stripe_size = em->orig_block_len; | |
4545 | ||
2b82032c | 4546 | chunk = kzalloc(item_size, GFP_NOFS); |
6df9a95e JB |
4547 | if (!chunk) { |
4548 | ret = -ENOMEM; | |
4549 | goto out; | |
4550 | } | |
4551 | ||
4552 | for (i = 0; i < map->num_stripes; i++) { | |
4553 | device = map->stripes[i].dev; | |
4554 | dev_offset = map->stripes[i].physical; | |
2b82032c | 4555 | |
0b86a832 | 4556 | ret = btrfs_update_device(trans, device); |
3acd3953 | 4557 | if (ret) |
6df9a95e JB |
4558 | goto out; |
4559 | ret = btrfs_alloc_dev_extent(trans, device, | |
4560 | chunk_root->root_key.objectid, | |
4561 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
4562 | chunk_offset, dev_offset, | |
4563 | stripe_size); | |
4564 | if (ret) | |
4565 | goto out; | |
2b82032c YZ |
4566 | } |
4567 | ||
2b82032c | 4568 | stripe = &chunk->stripe; |
6df9a95e JB |
4569 | for (i = 0; i < map->num_stripes; i++) { |
4570 | device = map->stripes[i].dev; | |
4571 | dev_offset = map->stripes[i].physical; | |
0b86a832 | 4572 | |
e17cade2 CM |
4573 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
4574 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
4575 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 4576 | stripe++; |
0b86a832 CM |
4577 | } |
4578 | ||
2b82032c | 4579 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 4580 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
4581 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
4582 | btrfs_set_stack_chunk_type(chunk, map->type); | |
4583 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
4584 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
4585 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b86a832 | 4586 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
2b82032c | 4587 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 4588 | |
2b82032c YZ |
4589 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
4590 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
4591 | key.offset = chunk_offset; | |
0b86a832 | 4592 | |
2b82032c | 4593 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
4ed1d16e MF |
4594 | if (ret == 0 && map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
4595 | /* | |
4596 | * TODO: Cleanup of inserted chunk root in case of | |
4597 | * failure. | |
4598 | */ | |
125ccb0a | 4599 | ret = btrfs_add_system_chunk(chunk_root, &key, chunk, |
2b82032c | 4600 | item_size); |
8f18cf13 | 4601 | } |
1abe9b8a | 4602 | |
6df9a95e | 4603 | out: |
0b86a832 | 4604 | kfree(chunk); |
6df9a95e | 4605 | free_extent_map(em); |
4ed1d16e | 4606 | return ret; |
2b82032c | 4607 | } |
0b86a832 | 4608 | |
2b82032c YZ |
4609 | /* |
4610 | * Chunk allocation falls into two parts. The first part does works | |
4611 | * that make the new allocated chunk useable, but not do any operation | |
4612 | * that modifies the chunk tree. The second part does the works that | |
4613 | * require modifying the chunk tree. This division is important for the | |
4614 | * bootstrap process of adding storage to a seed btrfs. | |
4615 | */ | |
4616 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
4617 | struct btrfs_root *extent_root, u64 type) | |
4618 | { | |
4619 | u64 chunk_offset; | |
2b82032c | 4620 | |
6df9a95e JB |
4621 | chunk_offset = find_next_chunk(extent_root->fs_info); |
4622 | return __btrfs_alloc_chunk(trans, extent_root, chunk_offset, type); | |
2b82032c YZ |
4623 | } |
4624 | ||
d397712b | 4625 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
2b82032c YZ |
4626 | struct btrfs_root *root, |
4627 | struct btrfs_device *device) | |
4628 | { | |
4629 | u64 chunk_offset; | |
4630 | u64 sys_chunk_offset; | |
2b82032c | 4631 | u64 alloc_profile; |
2b82032c YZ |
4632 | struct btrfs_fs_info *fs_info = root->fs_info; |
4633 | struct btrfs_root *extent_root = fs_info->extent_root; | |
4634 | int ret; | |
4635 | ||
6df9a95e | 4636 | chunk_offset = find_next_chunk(fs_info); |
de98ced9 | 4637 | alloc_profile = btrfs_get_alloc_profile(extent_root, 0); |
6df9a95e JB |
4638 | ret = __btrfs_alloc_chunk(trans, extent_root, chunk_offset, |
4639 | alloc_profile); | |
79787eaa JM |
4640 | if (ret) |
4641 | return ret; | |
2b82032c | 4642 | |
6df9a95e | 4643 | sys_chunk_offset = find_next_chunk(root->fs_info); |
de98ced9 | 4644 | alloc_profile = btrfs_get_alloc_profile(fs_info->chunk_root, 0); |
6df9a95e JB |
4645 | ret = __btrfs_alloc_chunk(trans, extent_root, sys_chunk_offset, |
4646 | alloc_profile); | |
79787eaa | 4647 | return ret; |
2b82032c YZ |
4648 | } |
4649 | ||
d20983b4 MX |
4650 | static inline int btrfs_chunk_max_errors(struct map_lookup *map) |
4651 | { | |
4652 | int max_errors; | |
4653 | ||
4654 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | | |
4655 | BTRFS_BLOCK_GROUP_RAID10 | | |
4656 | BTRFS_BLOCK_GROUP_RAID5 | | |
4657 | BTRFS_BLOCK_GROUP_DUP)) { | |
4658 | max_errors = 1; | |
4659 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID6) { | |
4660 | max_errors = 2; | |
4661 | } else { | |
4662 | max_errors = 0; | |
005d6427 | 4663 | } |
2b82032c | 4664 | |
d20983b4 | 4665 | return max_errors; |
2b82032c YZ |
4666 | } |
4667 | ||
4668 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) | |
4669 | { | |
4670 | struct extent_map *em; | |
4671 | struct map_lookup *map; | |
4672 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
4673 | int readonly = 0; | |
d20983b4 | 4674 | int miss_ndevs = 0; |
2b82032c YZ |
4675 | int i; |
4676 | ||
890871be | 4677 | read_lock(&map_tree->map_tree.lock); |
2b82032c | 4678 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
890871be | 4679 | read_unlock(&map_tree->map_tree.lock); |
2b82032c YZ |
4680 | if (!em) |
4681 | return 1; | |
4682 | ||
4683 | map = (struct map_lookup *)em->bdev; | |
4684 | for (i = 0; i < map->num_stripes; i++) { | |
d20983b4 MX |
4685 | if (map->stripes[i].dev->missing) { |
4686 | miss_ndevs++; | |
4687 | continue; | |
4688 | } | |
4689 | ||
2b82032c YZ |
4690 | if (!map->stripes[i].dev->writeable) { |
4691 | readonly = 1; | |
d20983b4 | 4692 | goto end; |
2b82032c YZ |
4693 | } |
4694 | } | |
d20983b4 MX |
4695 | |
4696 | /* | |
4697 | * If the number of missing devices is larger than max errors, | |
4698 | * we can not write the data into that chunk successfully, so | |
4699 | * set it readonly. | |
4700 | */ | |
4701 | if (miss_ndevs > btrfs_chunk_max_errors(map)) | |
4702 | readonly = 1; | |
4703 | end: | |
0b86a832 | 4704 | free_extent_map(em); |
2b82032c | 4705 | return readonly; |
0b86a832 CM |
4706 | } |
4707 | ||
4708 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
4709 | { | |
a8067e02 | 4710 | extent_map_tree_init(&tree->map_tree); |
0b86a832 CM |
4711 | } |
4712 | ||
4713 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
4714 | { | |
4715 | struct extent_map *em; | |
4716 | ||
d397712b | 4717 | while (1) { |
890871be | 4718 | write_lock(&tree->map_tree.lock); |
0b86a832 CM |
4719 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
4720 | if (em) | |
4721 | remove_extent_mapping(&tree->map_tree, em); | |
890871be | 4722 | write_unlock(&tree->map_tree.lock); |
0b86a832 CM |
4723 | if (!em) |
4724 | break; | |
0b86a832 CM |
4725 | /* once for us */ |
4726 | free_extent_map(em); | |
4727 | /* once for the tree */ | |
4728 | free_extent_map(em); | |
4729 | } | |
4730 | } | |
4731 | ||
5d964051 | 4732 | int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len) |
f188591e | 4733 | { |
5d964051 | 4734 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
f188591e CM |
4735 | struct extent_map *em; |
4736 | struct map_lookup *map; | |
4737 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
4738 | int ret; | |
4739 | ||
890871be | 4740 | read_lock(&em_tree->lock); |
f188591e | 4741 | em = lookup_extent_mapping(em_tree, logical, len); |
890871be | 4742 | read_unlock(&em_tree->lock); |
f188591e | 4743 | |
fb7669b5 JB |
4744 | /* |
4745 | * We could return errors for these cases, but that could get ugly and | |
4746 | * we'd probably do the same thing which is just not do anything else | |
4747 | * and exit, so return 1 so the callers don't try to use other copies. | |
4748 | */ | |
4749 | if (!em) { | |
351fd353 | 4750 | btrfs_crit(fs_info, "No mapping for %Lu-%Lu", logical, |
fb7669b5 JB |
4751 | logical+len); |
4752 | return 1; | |
4753 | } | |
4754 | ||
4755 | if (em->start > logical || em->start + em->len < logical) { | |
ccf39f92 | 4756 | btrfs_crit(fs_info, "Invalid mapping for %Lu-%Lu, got " |
351fd353 | 4757 | "%Lu-%Lu", logical, logical+len, em->start, |
fb7669b5 | 4758 | em->start + em->len); |
7d3d1744 | 4759 | free_extent_map(em); |
fb7669b5 JB |
4760 | return 1; |
4761 | } | |
4762 | ||
f188591e CM |
4763 | map = (struct map_lookup *)em->bdev; |
4764 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
4765 | ret = map->num_stripes; | |
321aecc6 CM |
4766 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
4767 | ret = map->sub_stripes; | |
53b381b3 DW |
4768 | else if (map->type & BTRFS_BLOCK_GROUP_RAID5) |
4769 | ret = 2; | |
4770 | else if (map->type & BTRFS_BLOCK_GROUP_RAID6) | |
4771 | ret = 3; | |
f188591e CM |
4772 | else |
4773 | ret = 1; | |
4774 | free_extent_map(em); | |
ad6d620e SB |
4775 | |
4776 | btrfs_dev_replace_lock(&fs_info->dev_replace); | |
4777 | if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) | |
4778 | ret++; | |
4779 | btrfs_dev_replace_unlock(&fs_info->dev_replace); | |
4780 | ||
f188591e CM |
4781 | return ret; |
4782 | } | |
4783 | ||
53b381b3 DW |
4784 | unsigned long btrfs_full_stripe_len(struct btrfs_root *root, |
4785 | struct btrfs_mapping_tree *map_tree, | |
4786 | u64 logical) | |
4787 | { | |
4788 | struct extent_map *em; | |
4789 | struct map_lookup *map; | |
4790 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
4791 | unsigned long len = root->sectorsize; | |
4792 | ||
4793 | read_lock(&em_tree->lock); | |
4794 | em = lookup_extent_mapping(em_tree, logical, len); | |
4795 | read_unlock(&em_tree->lock); | |
4796 | BUG_ON(!em); | |
4797 | ||
4798 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
4799 | map = (struct map_lookup *)em->bdev; | |
ffe2d203 | 4800 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 | 4801 | len = map->stripe_len * nr_data_stripes(map); |
53b381b3 DW |
4802 | free_extent_map(em); |
4803 | return len; | |
4804 | } | |
4805 | ||
4806 | int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree, | |
4807 | u64 logical, u64 len, int mirror_num) | |
4808 | { | |
4809 | struct extent_map *em; | |
4810 | struct map_lookup *map; | |
4811 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
4812 | int ret = 0; | |
4813 | ||
4814 | read_lock(&em_tree->lock); | |
4815 | em = lookup_extent_mapping(em_tree, logical, len); | |
4816 | read_unlock(&em_tree->lock); | |
4817 | BUG_ON(!em); | |
4818 | ||
4819 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
4820 | map = (struct map_lookup *)em->bdev; | |
ffe2d203 | 4821 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 DW |
4822 | ret = 1; |
4823 | free_extent_map(em); | |
4824 | return ret; | |
4825 | } | |
4826 | ||
30d9861f SB |
4827 | static int find_live_mirror(struct btrfs_fs_info *fs_info, |
4828 | struct map_lookup *map, int first, int num, | |
4829 | int optimal, int dev_replace_is_ongoing) | |
dfe25020 CM |
4830 | { |
4831 | int i; | |
30d9861f SB |
4832 | int tolerance; |
4833 | struct btrfs_device *srcdev; | |
4834 | ||
4835 | if (dev_replace_is_ongoing && | |
4836 | fs_info->dev_replace.cont_reading_from_srcdev_mode == | |
4837 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID) | |
4838 | srcdev = fs_info->dev_replace.srcdev; | |
4839 | else | |
4840 | srcdev = NULL; | |
4841 | ||
4842 | /* | |
4843 | * try to avoid the drive that is the source drive for a | |
4844 | * dev-replace procedure, only choose it if no other non-missing | |
4845 | * mirror is available | |
4846 | */ | |
4847 | for (tolerance = 0; tolerance < 2; tolerance++) { | |
4848 | if (map->stripes[optimal].dev->bdev && | |
4849 | (tolerance || map->stripes[optimal].dev != srcdev)) | |
4850 | return optimal; | |
4851 | for (i = first; i < first + num; i++) { | |
4852 | if (map->stripes[i].dev->bdev && | |
4853 | (tolerance || map->stripes[i].dev != srcdev)) | |
4854 | return i; | |
4855 | } | |
dfe25020 | 4856 | } |
30d9861f | 4857 | |
dfe25020 CM |
4858 | /* we couldn't find one that doesn't fail. Just return something |
4859 | * and the io error handling code will clean up eventually | |
4860 | */ | |
4861 | return optimal; | |
4862 | } | |
4863 | ||
53b381b3 DW |
4864 | static inline int parity_smaller(u64 a, u64 b) |
4865 | { | |
4866 | return a > b; | |
4867 | } | |
4868 | ||
4869 | /* Bubble-sort the stripe set to put the parity/syndrome stripes last */ | |
8e5cfb55 | 4870 | static void sort_parity_stripes(struct btrfs_bio *bbio, int num_stripes) |
53b381b3 DW |
4871 | { |
4872 | struct btrfs_bio_stripe s; | |
4873 | int i; | |
4874 | u64 l; | |
4875 | int again = 1; | |
4876 | ||
4877 | while (again) { | |
4878 | again = 0; | |
cc7539ed | 4879 | for (i = 0; i < num_stripes - 1; i++) { |
8e5cfb55 ZL |
4880 | if (parity_smaller(bbio->raid_map[i], |
4881 | bbio->raid_map[i+1])) { | |
53b381b3 | 4882 | s = bbio->stripes[i]; |
8e5cfb55 | 4883 | l = bbio->raid_map[i]; |
53b381b3 | 4884 | bbio->stripes[i] = bbio->stripes[i+1]; |
8e5cfb55 | 4885 | bbio->raid_map[i] = bbio->raid_map[i+1]; |
53b381b3 | 4886 | bbio->stripes[i+1] = s; |
8e5cfb55 | 4887 | bbio->raid_map[i+1] = l; |
2c8cdd6e | 4888 | |
53b381b3 DW |
4889 | again = 1; |
4890 | } | |
4891 | } | |
4892 | } | |
4893 | } | |
4894 | ||
6e9606d2 ZL |
4895 | static struct btrfs_bio *alloc_btrfs_bio(int total_stripes, int real_stripes) |
4896 | { | |
4897 | struct btrfs_bio *bbio = kzalloc( | |
4898 | sizeof(struct btrfs_bio) + | |
4899 | sizeof(struct btrfs_bio_stripe) * (total_stripes) + | |
4900 | sizeof(int) * (real_stripes) + | |
4901 | sizeof(u64) * (real_stripes), | |
4902 | GFP_NOFS); | |
4903 | if (!bbio) | |
4904 | return NULL; | |
4905 | ||
4906 | atomic_set(&bbio->error, 0); | |
4907 | atomic_set(&bbio->refs, 1); | |
4908 | ||
4909 | return bbio; | |
4910 | } | |
4911 | ||
4912 | void btrfs_get_bbio(struct btrfs_bio *bbio) | |
4913 | { | |
4914 | WARN_ON(!atomic_read(&bbio->refs)); | |
4915 | atomic_inc(&bbio->refs); | |
4916 | } | |
4917 | ||
4918 | void btrfs_put_bbio(struct btrfs_bio *bbio) | |
4919 | { | |
4920 | if (!bbio) | |
4921 | return; | |
4922 | if (atomic_dec_and_test(&bbio->refs)) | |
4923 | kfree(bbio); | |
4924 | } | |
4925 | ||
3ec706c8 | 4926 | static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, |
f2d8d74d | 4927 | u64 logical, u64 *length, |
a1d3c478 | 4928 | struct btrfs_bio **bbio_ret, |
8e5cfb55 | 4929 | int mirror_num, int need_raid_map) |
0b86a832 CM |
4930 | { |
4931 | struct extent_map *em; | |
4932 | struct map_lookup *map; | |
3ec706c8 | 4933 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
0b86a832 CM |
4934 | struct extent_map_tree *em_tree = &map_tree->map_tree; |
4935 | u64 offset; | |
593060d7 | 4936 | u64 stripe_offset; |
fce3bb9a | 4937 | u64 stripe_end_offset; |
593060d7 | 4938 | u64 stripe_nr; |
fce3bb9a LD |
4939 | u64 stripe_nr_orig; |
4940 | u64 stripe_nr_end; | |
53b381b3 | 4941 | u64 stripe_len; |
593060d7 | 4942 | int stripe_index; |
cea9e445 | 4943 | int i; |
de11cc12 | 4944 | int ret = 0; |
f2d8d74d | 4945 | int num_stripes; |
a236aed1 | 4946 | int max_errors = 0; |
2c8cdd6e | 4947 | int tgtdev_indexes = 0; |
a1d3c478 | 4948 | struct btrfs_bio *bbio = NULL; |
472262f3 SB |
4949 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
4950 | int dev_replace_is_ongoing = 0; | |
4951 | int num_alloc_stripes; | |
ad6d620e SB |
4952 | int patch_the_first_stripe_for_dev_replace = 0; |
4953 | u64 physical_to_patch_in_first_stripe = 0; | |
53b381b3 | 4954 | u64 raid56_full_stripe_start = (u64)-1; |
0b86a832 | 4955 | |
890871be | 4956 | read_lock(&em_tree->lock); |
0b86a832 | 4957 | em = lookup_extent_mapping(em_tree, logical, *length); |
890871be | 4958 | read_unlock(&em_tree->lock); |
f2d8d74d | 4959 | |
3b951516 | 4960 | if (!em) { |
c2cf52eb | 4961 | btrfs_crit(fs_info, "unable to find logical %llu len %llu", |
c1c9ff7c | 4962 | logical, *length); |
9bb91873 JB |
4963 | return -EINVAL; |
4964 | } | |
4965 | ||
4966 | if (em->start > logical || em->start + em->len < logical) { | |
4967 | btrfs_crit(fs_info, "found a bad mapping, wanted %Lu, " | |
351fd353 | 4968 | "found %Lu-%Lu", logical, em->start, |
9bb91873 | 4969 | em->start + em->len); |
7d3d1744 | 4970 | free_extent_map(em); |
9bb91873 | 4971 | return -EINVAL; |
3b951516 | 4972 | } |
0b86a832 | 4973 | |
0b86a832 CM |
4974 | map = (struct map_lookup *)em->bdev; |
4975 | offset = logical - em->start; | |
593060d7 | 4976 | |
53b381b3 | 4977 | stripe_len = map->stripe_len; |
593060d7 CM |
4978 | stripe_nr = offset; |
4979 | /* | |
4980 | * stripe_nr counts the total number of stripes we have to stride | |
4981 | * to get to this block | |
4982 | */ | |
53b381b3 | 4983 | do_div(stripe_nr, stripe_len); |
593060d7 | 4984 | |
53b381b3 | 4985 | stripe_offset = stripe_nr * stripe_len; |
593060d7 CM |
4986 | BUG_ON(offset < stripe_offset); |
4987 | ||
4988 | /* stripe_offset is the offset of this block in its stripe*/ | |
4989 | stripe_offset = offset - stripe_offset; | |
4990 | ||
53b381b3 | 4991 | /* if we're here for raid56, we need to know the stripe aligned start */ |
ffe2d203 | 4992 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
53b381b3 DW |
4993 | unsigned long full_stripe_len = stripe_len * nr_data_stripes(map); |
4994 | raid56_full_stripe_start = offset; | |
4995 | ||
4996 | /* allow a write of a full stripe, but make sure we don't | |
4997 | * allow straddling of stripes | |
4998 | */ | |
4999 | do_div(raid56_full_stripe_start, full_stripe_len); | |
5000 | raid56_full_stripe_start *= full_stripe_len; | |
5001 | } | |
5002 | ||
5003 | if (rw & REQ_DISCARD) { | |
5004 | /* we don't discard raid56 yet */ | |
ffe2d203 | 5005 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
53b381b3 DW |
5006 | ret = -EOPNOTSUPP; |
5007 | goto out; | |
5008 | } | |
fce3bb9a | 5009 | *length = min_t(u64, em->len - offset, *length); |
53b381b3 DW |
5010 | } else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) { |
5011 | u64 max_len; | |
5012 | /* For writes to RAID[56], allow a full stripeset across all disks. | |
5013 | For other RAID types and for RAID[56] reads, just allow a single | |
5014 | stripe (on a single disk). */ | |
ffe2d203 | 5015 | if ((map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) && |
53b381b3 DW |
5016 | (rw & REQ_WRITE)) { |
5017 | max_len = stripe_len * nr_data_stripes(map) - | |
5018 | (offset - raid56_full_stripe_start); | |
5019 | } else { | |
5020 | /* we limit the length of each bio to what fits in a stripe */ | |
5021 | max_len = stripe_len - stripe_offset; | |
5022 | } | |
5023 | *length = min_t(u64, em->len - offset, max_len); | |
cea9e445 CM |
5024 | } else { |
5025 | *length = em->len - offset; | |
5026 | } | |
f2d8d74d | 5027 | |
53b381b3 DW |
5028 | /* This is for when we're called from btrfs_merge_bio_hook() and all |
5029 | it cares about is the length */ | |
a1d3c478 | 5030 | if (!bbio_ret) |
cea9e445 CM |
5031 | goto out; |
5032 | ||
472262f3 SB |
5033 | btrfs_dev_replace_lock(dev_replace); |
5034 | dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace); | |
5035 | if (!dev_replace_is_ongoing) | |
5036 | btrfs_dev_replace_unlock(dev_replace); | |
5037 | ||
ad6d620e SB |
5038 | if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 && |
5039 | !(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) && | |
5040 | dev_replace->tgtdev != NULL) { | |
5041 | /* | |
5042 | * in dev-replace case, for repair case (that's the only | |
5043 | * case where the mirror is selected explicitly when | |
5044 | * calling btrfs_map_block), blocks left of the left cursor | |
5045 | * can also be read from the target drive. | |
5046 | * For REQ_GET_READ_MIRRORS, the target drive is added as | |
5047 | * the last one to the array of stripes. For READ, it also | |
5048 | * needs to be supported using the same mirror number. | |
5049 | * If the requested block is not left of the left cursor, | |
5050 | * EIO is returned. This can happen because btrfs_num_copies() | |
5051 | * returns one more in the dev-replace case. | |
5052 | */ | |
5053 | u64 tmp_length = *length; | |
5054 | struct btrfs_bio *tmp_bbio = NULL; | |
5055 | int tmp_num_stripes; | |
5056 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
5057 | int index_srcdev = 0; | |
5058 | int found = 0; | |
5059 | u64 physical_of_found = 0; | |
5060 | ||
5061 | ret = __btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, | |
8e5cfb55 | 5062 | logical, &tmp_length, &tmp_bbio, 0, 0); |
ad6d620e SB |
5063 | if (ret) { |
5064 | WARN_ON(tmp_bbio != NULL); | |
5065 | goto out; | |
5066 | } | |
5067 | ||
5068 | tmp_num_stripes = tmp_bbio->num_stripes; | |
5069 | if (mirror_num > tmp_num_stripes) { | |
5070 | /* | |
5071 | * REQ_GET_READ_MIRRORS does not contain this | |
5072 | * mirror, that means that the requested area | |
5073 | * is not left of the left cursor | |
5074 | */ | |
5075 | ret = -EIO; | |
6e9606d2 | 5076 | btrfs_put_bbio(tmp_bbio); |
ad6d620e SB |
5077 | goto out; |
5078 | } | |
5079 | ||
5080 | /* | |
5081 | * process the rest of the function using the mirror_num | |
5082 | * of the source drive. Therefore look it up first. | |
5083 | * At the end, patch the device pointer to the one of the | |
5084 | * target drive. | |
5085 | */ | |
5086 | for (i = 0; i < tmp_num_stripes; i++) { | |
5087 | if (tmp_bbio->stripes[i].dev->devid == srcdev_devid) { | |
5088 | /* | |
5089 | * In case of DUP, in order to keep it | |
5090 | * simple, only add the mirror with the | |
5091 | * lowest physical address | |
5092 | */ | |
5093 | if (found && | |
5094 | physical_of_found <= | |
5095 | tmp_bbio->stripes[i].physical) | |
5096 | continue; | |
5097 | index_srcdev = i; | |
5098 | found = 1; | |
5099 | physical_of_found = | |
5100 | tmp_bbio->stripes[i].physical; | |
5101 | } | |
5102 | } | |
5103 | ||
5104 | if (found) { | |
5105 | mirror_num = index_srcdev + 1; | |
5106 | patch_the_first_stripe_for_dev_replace = 1; | |
5107 | physical_to_patch_in_first_stripe = physical_of_found; | |
5108 | } else { | |
5109 | WARN_ON(1); | |
5110 | ret = -EIO; | |
6e9606d2 | 5111 | btrfs_put_bbio(tmp_bbio); |
ad6d620e SB |
5112 | goto out; |
5113 | } | |
5114 | ||
6e9606d2 | 5115 | btrfs_put_bbio(tmp_bbio); |
ad6d620e SB |
5116 | } else if (mirror_num > map->num_stripes) { |
5117 | mirror_num = 0; | |
5118 | } | |
5119 | ||
f2d8d74d | 5120 | num_stripes = 1; |
cea9e445 | 5121 | stripe_index = 0; |
fce3bb9a | 5122 | stripe_nr_orig = stripe_nr; |
fda2832f | 5123 | stripe_nr_end = ALIGN(offset + *length, map->stripe_len); |
fce3bb9a LD |
5124 | do_div(stripe_nr_end, map->stripe_len); |
5125 | stripe_end_offset = stripe_nr_end * map->stripe_len - | |
5126 | (offset + *length); | |
53b381b3 | 5127 | |
fce3bb9a LD |
5128 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
5129 | if (rw & REQ_DISCARD) | |
5130 | num_stripes = min_t(u64, map->num_stripes, | |
5131 | stripe_nr_end - stripe_nr_orig); | |
5132 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
28e1cc7d MX |
5133 | if (!(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS))) |
5134 | mirror_num = 1; | |
fce3bb9a | 5135 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
29a8d9a0 | 5136 | if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) |
f2d8d74d | 5137 | num_stripes = map->num_stripes; |
2fff734f | 5138 | else if (mirror_num) |
f188591e | 5139 | stripe_index = mirror_num - 1; |
dfe25020 | 5140 | else { |
30d9861f | 5141 | stripe_index = find_live_mirror(fs_info, map, 0, |
dfe25020 | 5142 | map->num_stripes, |
30d9861f SB |
5143 | current->pid % map->num_stripes, |
5144 | dev_replace_is_ongoing); | |
a1d3c478 | 5145 | mirror_num = stripe_index + 1; |
dfe25020 | 5146 | } |
2fff734f | 5147 | |
611f0e00 | 5148 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
29a8d9a0 | 5149 | if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) { |
f2d8d74d | 5150 | num_stripes = map->num_stripes; |
a1d3c478 | 5151 | } else if (mirror_num) { |
f188591e | 5152 | stripe_index = mirror_num - 1; |
a1d3c478 JS |
5153 | } else { |
5154 | mirror_num = 1; | |
5155 | } | |
2fff734f | 5156 | |
321aecc6 CM |
5157 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
5158 | int factor = map->num_stripes / map->sub_stripes; | |
321aecc6 CM |
5159 | |
5160 | stripe_index = do_div(stripe_nr, factor); | |
5161 | stripe_index *= map->sub_stripes; | |
5162 | ||
29a8d9a0 | 5163 | if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) |
f2d8d74d | 5164 | num_stripes = map->sub_stripes; |
fce3bb9a LD |
5165 | else if (rw & REQ_DISCARD) |
5166 | num_stripes = min_t(u64, map->sub_stripes * | |
5167 | (stripe_nr_end - stripe_nr_orig), | |
5168 | map->num_stripes); | |
321aecc6 CM |
5169 | else if (mirror_num) |
5170 | stripe_index += mirror_num - 1; | |
dfe25020 | 5171 | else { |
3e74317a | 5172 | int old_stripe_index = stripe_index; |
30d9861f SB |
5173 | stripe_index = find_live_mirror(fs_info, map, |
5174 | stripe_index, | |
dfe25020 | 5175 | map->sub_stripes, stripe_index + |
30d9861f SB |
5176 | current->pid % map->sub_stripes, |
5177 | dev_replace_is_ongoing); | |
3e74317a | 5178 | mirror_num = stripe_index - old_stripe_index + 1; |
dfe25020 | 5179 | } |
53b381b3 | 5180 | |
ffe2d203 | 5181 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
8e5cfb55 | 5182 | if (need_raid_map && |
af8e2d1d MX |
5183 | ((rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) || |
5184 | mirror_num > 1)) { | |
53b381b3 DW |
5185 | /* push stripe_nr back to the start of the full stripe */ |
5186 | stripe_nr = raid56_full_stripe_start; | |
6de65650 | 5187 | do_div(stripe_nr, stripe_len * nr_data_stripes(map)); |
53b381b3 DW |
5188 | |
5189 | /* RAID[56] write or recovery. Return all stripes */ | |
5190 | num_stripes = map->num_stripes; | |
5191 | max_errors = nr_parity_stripes(map); | |
5192 | ||
53b381b3 DW |
5193 | *length = map->stripe_len; |
5194 | stripe_index = 0; | |
5195 | stripe_offset = 0; | |
5196 | } else { | |
8e5cfb55 ZL |
5197 | u64 tmp; |
5198 | ||
53b381b3 DW |
5199 | /* |
5200 | * Mirror #0 or #1 means the original data block. | |
5201 | * Mirror #2 is RAID5 parity block. | |
5202 | * Mirror #3 is RAID6 Q block. | |
5203 | */ | |
5204 | stripe_index = do_div(stripe_nr, nr_data_stripes(map)); | |
5205 | if (mirror_num > 1) | |
5206 | stripe_index = nr_data_stripes(map) + | |
5207 | mirror_num - 2; | |
5208 | ||
5209 | /* We distribute the parity blocks across stripes */ | |
5210 | tmp = stripe_nr + stripe_index; | |
5211 | stripe_index = do_div(tmp, map->num_stripes); | |
28e1cc7d MX |
5212 | if (!(rw & (REQ_WRITE | REQ_DISCARD | |
5213 | REQ_GET_READ_MIRRORS)) && mirror_num <= 1) | |
5214 | mirror_num = 1; | |
53b381b3 | 5215 | } |
8790d502 CM |
5216 | } else { |
5217 | /* | |
5218 | * after this do_div call, stripe_nr is the number of stripes | |
5219 | * on this device we have to walk to find the data, and | |
5220 | * stripe_index is the number of our device in the stripe array | |
5221 | */ | |
5222 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
a1d3c478 | 5223 | mirror_num = stripe_index + 1; |
8790d502 | 5224 | } |
593060d7 | 5225 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 5226 | |
472262f3 | 5227 | num_alloc_stripes = num_stripes; |
ad6d620e SB |
5228 | if (dev_replace_is_ongoing) { |
5229 | if (rw & (REQ_WRITE | REQ_DISCARD)) | |
5230 | num_alloc_stripes <<= 1; | |
5231 | if (rw & REQ_GET_READ_MIRRORS) | |
5232 | num_alloc_stripes++; | |
2c8cdd6e | 5233 | tgtdev_indexes = num_stripes; |
ad6d620e | 5234 | } |
2c8cdd6e | 5235 | |
6e9606d2 | 5236 | bbio = alloc_btrfs_bio(num_alloc_stripes, tgtdev_indexes); |
de11cc12 LZ |
5237 | if (!bbio) { |
5238 | ret = -ENOMEM; | |
5239 | goto out; | |
5240 | } | |
2c8cdd6e MX |
5241 | if (dev_replace_is_ongoing) |
5242 | bbio->tgtdev_map = (int *)(bbio->stripes + num_alloc_stripes); | |
de11cc12 | 5243 | |
8e5cfb55 | 5244 | /* build raid_map */ |
ffe2d203 | 5245 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK && |
8e5cfb55 ZL |
5246 | need_raid_map && ((rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) || |
5247 | mirror_num > 1)) { | |
5248 | u64 tmp; | |
5249 | int i, rot; | |
5250 | ||
5251 | bbio->raid_map = (u64 *)((void *)bbio->stripes + | |
5252 | sizeof(struct btrfs_bio_stripe) * | |
5253 | num_alloc_stripes + | |
5254 | sizeof(int) * tgtdev_indexes); | |
5255 | ||
5256 | /* Work out the disk rotation on this stripe-set */ | |
5257 | tmp = stripe_nr; | |
5258 | rot = do_div(tmp, num_stripes); | |
5259 | ||
5260 | /* Fill in the logical address of each stripe */ | |
5261 | tmp = stripe_nr * nr_data_stripes(map); | |
5262 | for (i = 0; i < nr_data_stripes(map); i++) | |
5263 | bbio->raid_map[(i+rot) % num_stripes] = | |
5264 | em->start + (tmp + i) * map->stripe_len; | |
5265 | ||
5266 | bbio->raid_map[(i+rot) % map->num_stripes] = RAID5_P_STRIPE; | |
5267 | if (map->type & BTRFS_BLOCK_GROUP_RAID6) | |
5268 | bbio->raid_map[(i+rot+1) % num_stripes] = | |
5269 | RAID6_Q_STRIPE; | |
5270 | } | |
5271 | ||
fce3bb9a | 5272 | if (rw & REQ_DISCARD) { |
ec9ef7a1 LZ |
5273 | int factor = 0; |
5274 | int sub_stripes = 0; | |
5275 | u64 stripes_per_dev = 0; | |
5276 | u32 remaining_stripes = 0; | |
b89203f7 | 5277 | u32 last_stripe = 0; |
ec9ef7a1 LZ |
5278 | |
5279 | if (map->type & | |
5280 | (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID10)) { | |
5281 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
5282 | sub_stripes = 1; | |
5283 | else | |
5284 | sub_stripes = map->sub_stripes; | |
5285 | ||
5286 | factor = map->num_stripes / sub_stripes; | |
5287 | stripes_per_dev = div_u64_rem(stripe_nr_end - | |
5288 | stripe_nr_orig, | |
5289 | factor, | |
5290 | &remaining_stripes); | |
b89203f7 LB |
5291 | div_u64_rem(stripe_nr_end - 1, factor, &last_stripe); |
5292 | last_stripe *= sub_stripes; | |
ec9ef7a1 LZ |
5293 | } |
5294 | ||
fce3bb9a | 5295 | for (i = 0; i < num_stripes; i++) { |
a1d3c478 | 5296 | bbio->stripes[i].physical = |
f2d8d74d CM |
5297 | map->stripes[stripe_index].physical + |
5298 | stripe_offset + stripe_nr * map->stripe_len; | |
a1d3c478 | 5299 | bbio->stripes[i].dev = map->stripes[stripe_index].dev; |
fce3bb9a | 5300 | |
ec9ef7a1 LZ |
5301 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | |
5302 | BTRFS_BLOCK_GROUP_RAID10)) { | |
5303 | bbio->stripes[i].length = stripes_per_dev * | |
5304 | map->stripe_len; | |
b89203f7 | 5305 | |
ec9ef7a1 LZ |
5306 | if (i / sub_stripes < remaining_stripes) |
5307 | bbio->stripes[i].length += | |
5308 | map->stripe_len; | |
b89203f7 LB |
5309 | |
5310 | /* | |
5311 | * Special for the first stripe and | |
5312 | * the last stripe: | |
5313 | * | |
5314 | * |-------|...|-------| | |
5315 | * |----------| | |
5316 | * off end_off | |
5317 | */ | |
ec9ef7a1 | 5318 | if (i < sub_stripes) |
a1d3c478 | 5319 | bbio->stripes[i].length -= |
fce3bb9a | 5320 | stripe_offset; |
b89203f7 LB |
5321 | |
5322 | if (stripe_index >= last_stripe && | |
5323 | stripe_index <= (last_stripe + | |
5324 | sub_stripes - 1)) | |
a1d3c478 | 5325 | bbio->stripes[i].length -= |
fce3bb9a | 5326 | stripe_end_offset; |
b89203f7 | 5327 | |
ec9ef7a1 LZ |
5328 | if (i == sub_stripes - 1) |
5329 | stripe_offset = 0; | |
fce3bb9a | 5330 | } else |
a1d3c478 | 5331 | bbio->stripes[i].length = *length; |
fce3bb9a LD |
5332 | |
5333 | stripe_index++; | |
5334 | if (stripe_index == map->num_stripes) { | |
5335 | /* This could only happen for RAID0/10 */ | |
5336 | stripe_index = 0; | |
5337 | stripe_nr++; | |
5338 | } | |
5339 | } | |
5340 | } else { | |
5341 | for (i = 0; i < num_stripes; i++) { | |
a1d3c478 | 5342 | bbio->stripes[i].physical = |
212a17ab LT |
5343 | map->stripes[stripe_index].physical + |
5344 | stripe_offset + | |
5345 | stripe_nr * map->stripe_len; | |
a1d3c478 | 5346 | bbio->stripes[i].dev = |
212a17ab | 5347 | map->stripes[stripe_index].dev; |
fce3bb9a | 5348 | stripe_index++; |
f2d8d74d | 5349 | } |
593060d7 | 5350 | } |
de11cc12 | 5351 | |
d20983b4 MX |
5352 | if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) |
5353 | max_errors = btrfs_chunk_max_errors(map); | |
de11cc12 | 5354 | |
8e5cfb55 ZL |
5355 | if (bbio->raid_map) |
5356 | sort_parity_stripes(bbio, num_stripes); | |
cc7539ed | 5357 | |
2c8cdd6e | 5358 | tgtdev_indexes = 0; |
472262f3 SB |
5359 | if (dev_replace_is_ongoing && (rw & (REQ_WRITE | REQ_DISCARD)) && |
5360 | dev_replace->tgtdev != NULL) { | |
5361 | int index_where_to_add; | |
5362 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
5363 | ||
5364 | /* | |
5365 | * duplicate the write operations while the dev replace | |
5366 | * procedure is running. Since the copying of the old disk | |
5367 | * to the new disk takes place at run time while the | |
5368 | * filesystem is mounted writable, the regular write | |
5369 | * operations to the old disk have to be duplicated to go | |
5370 | * to the new disk as well. | |
5371 | * Note that device->missing is handled by the caller, and | |
5372 | * that the write to the old disk is already set up in the | |
5373 | * stripes array. | |
5374 | */ | |
5375 | index_where_to_add = num_stripes; | |
5376 | for (i = 0; i < num_stripes; i++) { | |
5377 | if (bbio->stripes[i].dev->devid == srcdev_devid) { | |
5378 | /* write to new disk, too */ | |
5379 | struct btrfs_bio_stripe *new = | |
5380 | bbio->stripes + index_where_to_add; | |
5381 | struct btrfs_bio_stripe *old = | |
5382 | bbio->stripes + i; | |
5383 | ||
5384 | new->physical = old->physical; | |
5385 | new->length = old->length; | |
5386 | new->dev = dev_replace->tgtdev; | |
2c8cdd6e | 5387 | bbio->tgtdev_map[i] = index_where_to_add; |
472262f3 SB |
5388 | index_where_to_add++; |
5389 | max_errors++; | |
2c8cdd6e | 5390 | tgtdev_indexes++; |
472262f3 SB |
5391 | } |
5392 | } | |
5393 | num_stripes = index_where_to_add; | |
ad6d620e SB |
5394 | } else if (dev_replace_is_ongoing && (rw & REQ_GET_READ_MIRRORS) && |
5395 | dev_replace->tgtdev != NULL) { | |
5396 | u64 srcdev_devid = dev_replace->srcdev->devid; | |
5397 | int index_srcdev = 0; | |
5398 | int found = 0; | |
5399 | u64 physical_of_found = 0; | |
5400 | ||
5401 | /* | |
5402 | * During the dev-replace procedure, the target drive can | |
5403 | * also be used to read data in case it is needed to repair | |
5404 | * a corrupt block elsewhere. This is possible if the | |
5405 | * requested area is left of the left cursor. In this area, | |
5406 | * the target drive is a full copy of the source drive. | |
5407 | */ | |
5408 | for (i = 0; i < num_stripes; i++) { | |
5409 | if (bbio->stripes[i].dev->devid == srcdev_devid) { | |
5410 | /* | |
5411 | * In case of DUP, in order to keep it | |
5412 | * simple, only add the mirror with the | |
5413 | * lowest physical address | |
5414 | */ | |
5415 | if (found && | |
5416 | physical_of_found <= | |
5417 | bbio->stripes[i].physical) | |
5418 | continue; | |
5419 | index_srcdev = i; | |
5420 | found = 1; | |
5421 | physical_of_found = bbio->stripes[i].physical; | |
5422 | } | |
5423 | } | |
5424 | if (found) { | |
5425 | u64 length = map->stripe_len; | |
5426 | ||
5427 | if (physical_of_found + length <= | |
5428 | dev_replace->cursor_left) { | |
5429 | struct btrfs_bio_stripe *tgtdev_stripe = | |
5430 | bbio->stripes + num_stripes; | |
5431 | ||
5432 | tgtdev_stripe->physical = physical_of_found; | |
5433 | tgtdev_stripe->length = | |
5434 | bbio->stripes[index_srcdev].length; | |
5435 | tgtdev_stripe->dev = dev_replace->tgtdev; | |
2c8cdd6e | 5436 | bbio->tgtdev_map[index_srcdev] = num_stripes; |
ad6d620e | 5437 | |
2c8cdd6e | 5438 | tgtdev_indexes++; |
ad6d620e SB |
5439 | num_stripes++; |
5440 | } | |
5441 | } | |
472262f3 SB |
5442 | } |
5443 | ||
de11cc12 | 5444 | *bbio_ret = bbio; |
10f11900 | 5445 | bbio->map_type = map->type; |
de11cc12 LZ |
5446 | bbio->num_stripes = num_stripes; |
5447 | bbio->max_errors = max_errors; | |
5448 | bbio->mirror_num = mirror_num; | |
2c8cdd6e | 5449 | bbio->num_tgtdevs = tgtdev_indexes; |
ad6d620e SB |
5450 | |
5451 | /* | |
5452 | * this is the case that REQ_READ && dev_replace_is_ongoing && | |
5453 | * mirror_num == num_stripes + 1 && dev_replace target drive is | |
5454 | * available as a mirror | |
5455 | */ | |
5456 | if (patch_the_first_stripe_for_dev_replace && num_stripes > 0) { | |
5457 | WARN_ON(num_stripes > 1); | |
5458 | bbio->stripes[0].dev = dev_replace->tgtdev; | |
5459 | bbio->stripes[0].physical = physical_to_patch_in_first_stripe; | |
5460 | bbio->mirror_num = map->num_stripes + 1; | |
5461 | } | |
cea9e445 | 5462 | out: |
472262f3 SB |
5463 | if (dev_replace_is_ongoing) |
5464 | btrfs_dev_replace_unlock(dev_replace); | |
0b86a832 | 5465 | free_extent_map(em); |
de11cc12 | 5466 | return ret; |
0b86a832 CM |
5467 | } |
5468 | ||
3ec706c8 | 5469 | int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, |
f2d8d74d | 5470 | u64 logical, u64 *length, |
a1d3c478 | 5471 | struct btrfs_bio **bbio_ret, int mirror_num) |
f2d8d74d | 5472 | { |
3ec706c8 | 5473 | return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret, |
8e5cfb55 | 5474 | mirror_num, 0); |
f2d8d74d CM |
5475 | } |
5476 | ||
af8e2d1d MX |
5477 | /* For Scrub/replace */ |
5478 | int btrfs_map_sblock(struct btrfs_fs_info *fs_info, int rw, | |
5479 | u64 logical, u64 *length, | |
5480 | struct btrfs_bio **bbio_ret, int mirror_num, | |
8e5cfb55 | 5481 | int need_raid_map) |
af8e2d1d MX |
5482 | { |
5483 | return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret, | |
8e5cfb55 | 5484 | mirror_num, need_raid_map); |
af8e2d1d MX |
5485 | } |
5486 | ||
a512bbf8 YZ |
5487 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
5488 | u64 chunk_start, u64 physical, u64 devid, | |
5489 | u64 **logical, int *naddrs, int *stripe_len) | |
5490 | { | |
5491 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
5492 | struct extent_map *em; | |
5493 | struct map_lookup *map; | |
5494 | u64 *buf; | |
5495 | u64 bytenr; | |
5496 | u64 length; | |
5497 | u64 stripe_nr; | |
53b381b3 | 5498 | u64 rmap_len; |
a512bbf8 YZ |
5499 | int i, j, nr = 0; |
5500 | ||
890871be | 5501 | read_lock(&em_tree->lock); |
a512bbf8 | 5502 | em = lookup_extent_mapping(em_tree, chunk_start, 1); |
890871be | 5503 | read_unlock(&em_tree->lock); |
a512bbf8 | 5504 | |
835d974f | 5505 | if (!em) { |
efe120a0 | 5506 | printk(KERN_ERR "BTRFS: couldn't find em for chunk %Lu\n", |
835d974f JB |
5507 | chunk_start); |
5508 | return -EIO; | |
5509 | } | |
5510 | ||
5511 | if (em->start != chunk_start) { | |
efe120a0 | 5512 | printk(KERN_ERR "BTRFS: bad chunk start, em=%Lu, wanted=%Lu\n", |
835d974f JB |
5513 | em->start, chunk_start); |
5514 | free_extent_map(em); | |
5515 | return -EIO; | |
5516 | } | |
a512bbf8 YZ |
5517 | map = (struct map_lookup *)em->bdev; |
5518 | ||
5519 | length = em->len; | |
53b381b3 DW |
5520 | rmap_len = map->stripe_len; |
5521 | ||
a512bbf8 YZ |
5522 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
5523 | do_div(length, map->num_stripes / map->sub_stripes); | |
5524 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
5525 | do_div(length, map->num_stripes); | |
ffe2d203 | 5526 | else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
53b381b3 DW |
5527 | do_div(length, nr_data_stripes(map)); |
5528 | rmap_len = map->stripe_len * nr_data_stripes(map); | |
5529 | } | |
a512bbf8 YZ |
5530 | |
5531 | buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); | |
79787eaa | 5532 | BUG_ON(!buf); /* -ENOMEM */ |
a512bbf8 YZ |
5533 | |
5534 | for (i = 0; i < map->num_stripes; i++) { | |
5535 | if (devid && map->stripes[i].dev->devid != devid) | |
5536 | continue; | |
5537 | if (map->stripes[i].physical > physical || | |
5538 | map->stripes[i].physical + length <= physical) | |
5539 | continue; | |
5540 | ||
5541 | stripe_nr = physical - map->stripes[i].physical; | |
5542 | do_div(stripe_nr, map->stripe_len); | |
5543 | ||
5544 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
5545 | stripe_nr = stripe_nr * map->num_stripes + i; | |
5546 | do_div(stripe_nr, map->sub_stripes); | |
5547 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
5548 | stripe_nr = stripe_nr * map->num_stripes + i; | |
53b381b3 DW |
5549 | } /* else if RAID[56], multiply by nr_data_stripes(). |
5550 | * Alternatively, just use rmap_len below instead of | |
5551 | * map->stripe_len */ | |
5552 | ||
5553 | bytenr = chunk_start + stripe_nr * rmap_len; | |
934d375b | 5554 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
5555 | for (j = 0; j < nr; j++) { |
5556 | if (buf[j] == bytenr) | |
5557 | break; | |
5558 | } | |
934d375b CM |
5559 | if (j == nr) { |
5560 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 5561 | buf[nr++] = bytenr; |
934d375b | 5562 | } |
a512bbf8 YZ |
5563 | } |
5564 | ||
a512bbf8 YZ |
5565 | *logical = buf; |
5566 | *naddrs = nr; | |
53b381b3 | 5567 | *stripe_len = rmap_len; |
a512bbf8 YZ |
5568 | |
5569 | free_extent_map(em); | |
5570 | return 0; | |
f2d8d74d CM |
5571 | } |
5572 | ||
8408c716 MX |
5573 | static inline void btrfs_end_bbio(struct btrfs_bio *bbio, struct bio *bio, int err) |
5574 | { | |
5575 | if (likely(bbio->flags & BTRFS_BIO_ORIG_BIO_SUBMITTED)) | |
5576 | bio_endio_nodec(bio, err); | |
5577 | else | |
5578 | bio_endio(bio, err); | |
6e9606d2 | 5579 | btrfs_put_bbio(bbio); |
8408c716 MX |
5580 | } |
5581 | ||
a1d3c478 | 5582 | static void btrfs_end_bio(struct bio *bio, int err) |
8790d502 | 5583 | { |
9be3395b | 5584 | struct btrfs_bio *bbio = bio->bi_private; |
c404e0dc | 5585 | struct btrfs_device *dev = bbio->stripes[0].dev; |
7d2b4daa | 5586 | int is_orig_bio = 0; |
8790d502 | 5587 | |
442a4f63 | 5588 | if (err) { |
a1d3c478 | 5589 | atomic_inc(&bbio->error); |
442a4f63 SB |
5590 | if (err == -EIO || err == -EREMOTEIO) { |
5591 | unsigned int stripe_index = | |
9be3395b | 5592 | btrfs_io_bio(bio)->stripe_index; |
442a4f63 SB |
5593 | |
5594 | BUG_ON(stripe_index >= bbio->num_stripes); | |
5595 | dev = bbio->stripes[stripe_index].dev; | |
597a60fa SB |
5596 | if (dev->bdev) { |
5597 | if (bio->bi_rw & WRITE) | |
5598 | btrfs_dev_stat_inc(dev, | |
5599 | BTRFS_DEV_STAT_WRITE_ERRS); | |
5600 | else | |
5601 | btrfs_dev_stat_inc(dev, | |
5602 | BTRFS_DEV_STAT_READ_ERRS); | |
5603 | if ((bio->bi_rw & WRITE_FLUSH) == WRITE_FLUSH) | |
5604 | btrfs_dev_stat_inc(dev, | |
5605 | BTRFS_DEV_STAT_FLUSH_ERRS); | |
5606 | btrfs_dev_stat_print_on_error(dev); | |
5607 | } | |
442a4f63 SB |
5608 | } |
5609 | } | |
8790d502 | 5610 | |
a1d3c478 | 5611 | if (bio == bbio->orig_bio) |
7d2b4daa CM |
5612 | is_orig_bio = 1; |
5613 | ||
c404e0dc MX |
5614 | btrfs_bio_counter_dec(bbio->fs_info); |
5615 | ||
a1d3c478 | 5616 | if (atomic_dec_and_test(&bbio->stripes_pending)) { |
7d2b4daa CM |
5617 | if (!is_orig_bio) { |
5618 | bio_put(bio); | |
a1d3c478 | 5619 | bio = bbio->orig_bio; |
7d2b4daa | 5620 | } |
c7b22bb1 | 5621 | |
a1d3c478 JS |
5622 | bio->bi_private = bbio->private; |
5623 | bio->bi_end_io = bbio->end_io; | |
9be3395b | 5624 | btrfs_io_bio(bio)->mirror_num = bbio->mirror_num; |
a236aed1 | 5625 | /* only send an error to the higher layers if it is |
53b381b3 | 5626 | * beyond the tolerance of the btrfs bio |
a236aed1 | 5627 | */ |
a1d3c478 | 5628 | if (atomic_read(&bbio->error) > bbio->max_errors) { |
a236aed1 | 5629 | err = -EIO; |
5dbc8fca | 5630 | } else { |
1259ab75 CM |
5631 | /* |
5632 | * this bio is actually up to date, we didn't | |
5633 | * go over the max number of errors | |
5634 | */ | |
5635 | set_bit(BIO_UPTODATE, &bio->bi_flags); | |
a236aed1 | 5636 | err = 0; |
1259ab75 | 5637 | } |
c55f1396 | 5638 | |
8408c716 | 5639 | btrfs_end_bbio(bbio, bio, err); |
7d2b4daa | 5640 | } else if (!is_orig_bio) { |
8790d502 CM |
5641 | bio_put(bio); |
5642 | } | |
8790d502 CM |
5643 | } |
5644 | ||
8b712842 CM |
5645 | /* |
5646 | * see run_scheduled_bios for a description of why bios are collected for | |
5647 | * async submit. | |
5648 | * | |
5649 | * This will add one bio to the pending list for a device and make sure | |
5650 | * the work struct is scheduled. | |
5651 | */ | |
48a3b636 ES |
5652 | static noinline void btrfs_schedule_bio(struct btrfs_root *root, |
5653 | struct btrfs_device *device, | |
5654 | int rw, struct bio *bio) | |
8b712842 CM |
5655 | { |
5656 | int should_queue = 1; | |
ffbd517d | 5657 | struct btrfs_pending_bios *pending_bios; |
8b712842 | 5658 | |
53b381b3 DW |
5659 | if (device->missing || !device->bdev) { |
5660 | bio_endio(bio, -EIO); | |
5661 | return; | |
5662 | } | |
5663 | ||
8b712842 | 5664 | /* don't bother with additional async steps for reads, right now */ |
7b6d91da | 5665 | if (!(rw & REQ_WRITE)) { |
492bb6de | 5666 | bio_get(bio); |
21adbd5c | 5667 | btrfsic_submit_bio(rw, bio); |
492bb6de | 5668 | bio_put(bio); |
143bede5 | 5669 | return; |
8b712842 CM |
5670 | } |
5671 | ||
5672 | /* | |
0986fe9e | 5673 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
5674 | * higher layers. Otherwise, the async bio makes it appear we have |
5675 | * made progress against dirty pages when we've really just put it | |
5676 | * on a queue for later | |
5677 | */ | |
0986fe9e | 5678 | atomic_inc(&root->fs_info->nr_async_bios); |
492bb6de | 5679 | WARN_ON(bio->bi_next); |
8b712842 CM |
5680 | bio->bi_next = NULL; |
5681 | bio->bi_rw |= rw; | |
5682 | ||
5683 | spin_lock(&device->io_lock); | |
7b6d91da | 5684 | if (bio->bi_rw & REQ_SYNC) |
ffbd517d CM |
5685 | pending_bios = &device->pending_sync_bios; |
5686 | else | |
5687 | pending_bios = &device->pending_bios; | |
8b712842 | 5688 | |
ffbd517d CM |
5689 | if (pending_bios->tail) |
5690 | pending_bios->tail->bi_next = bio; | |
8b712842 | 5691 | |
ffbd517d CM |
5692 | pending_bios->tail = bio; |
5693 | if (!pending_bios->head) | |
5694 | pending_bios->head = bio; | |
8b712842 CM |
5695 | if (device->running_pending) |
5696 | should_queue = 0; | |
5697 | ||
5698 | spin_unlock(&device->io_lock); | |
5699 | ||
5700 | if (should_queue) | |
a8c93d4e QW |
5701 | btrfs_queue_work(root->fs_info->submit_workers, |
5702 | &device->work); | |
8b712842 CM |
5703 | } |
5704 | ||
de1ee92a JB |
5705 | static int bio_size_ok(struct block_device *bdev, struct bio *bio, |
5706 | sector_t sector) | |
5707 | { | |
5708 | struct bio_vec *prev; | |
5709 | struct request_queue *q = bdev_get_queue(bdev); | |
475bf36f | 5710 | unsigned int max_sectors = queue_max_sectors(q); |
de1ee92a JB |
5711 | struct bvec_merge_data bvm = { |
5712 | .bi_bdev = bdev, | |
5713 | .bi_sector = sector, | |
5714 | .bi_rw = bio->bi_rw, | |
5715 | }; | |
5716 | ||
fae7f21c | 5717 | if (WARN_ON(bio->bi_vcnt == 0)) |
de1ee92a | 5718 | return 1; |
de1ee92a JB |
5719 | |
5720 | prev = &bio->bi_io_vec[bio->bi_vcnt - 1]; | |
aa8b57aa | 5721 | if (bio_sectors(bio) > max_sectors) |
de1ee92a JB |
5722 | return 0; |
5723 | ||
5724 | if (!q->merge_bvec_fn) | |
5725 | return 1; | |
5726 | ||
4f024f37 | 5727 | bvm.bi_size = bio->bi_iter.bi_size - prev->bv_len; |
de1ee92a JB |
5728 | if (q->merge_bvec_fn(q, &bvm, prev) < prev->bv_len) |
5729 | return 0; | |
5730 | return 1; | |
5731 | } | |
5732 | ||
5733 | static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio, | |
5734 | struct bio *bio, u64 physical, int dev_nr, | |
5735 | int rw, int async) | |
5736 | { | |
5737 | struct btrfs_device *dev = bbio->stripes[dev_nr].dev; | |
5738 | ||
5739 | bio->bi_private = bbio; | |
9be3395b | 5740 | btrfs_io_bio(bio)->stripe_index = dev_nr; |
de1ee92a | 5741 | bio->bi_end_io = btrfs_end_bio; |
4f024f37 | 5742 | bio->bi_iter.bi_sector = physical >> 9; |
de1ee92a JB |
5743 | #ifdef DEBUG |
5744 | { | |
5745 | struct rcu_string *name; | |
5746 | ||
5747 | rcu_read_lock(); | |
5748 | name = rcu_dereference(dev->name); | |
d1423248 | 5749 | pr_debug("btrfs_map_bio: rw %d, sector=%llu, dev=%lu " |
de1ee92a | 5750 | "(%s id %llu), size=%u\n", rw, |
1b6e4469 FF |
5751 | (u64)bio->bi_iter.bi_sector, (u_long)dev->bdev->bd_dev, |
5752 | name->str, dev->devid, bio->bi_iter.bi_size); | |
de1ee92a JB |
5753 | rcu_read_unlock(); |
5754 | } | |
5755 | #endif | |
5756 | bio->bi_bdev = dev->bdev; | |
c404e0dc MX |
5757 | |
5758 | btrfs_bio_counter_inc_noblocked(root->fs_info); | |
5759 | ||
de1ee92a | 5760 | if (async) |
53b381b3 | 5761 | btrfs_schedule_bio(root, dev, rw, bio); |
de1ee92a JB |
5762 | else |
5763 | btrfsic_submit_bio(rw, bio); | |
5764 | } | |
5765 | ||
5766 | static int breakup_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio, | |
5767 | struct bio *first_bio, struct btrfs_device *dev, | |
5768 | int dev_nr, int rw, int async) | |
5769 | { | |
5770 | struct bio_vec *bvec = first_bio->bi_io_vec; | |
5771 | struct bio *bio; | |
5772 | int nr_vecs = bio_get_nr_vecs(dev->bdev); | |
5773 | u64 physical = bbio->stripes[dev_nr].physical; | |
5774 | ||
5775 | again: | |
5776 | bio = btrfs_bio_alloc(dev->bdev, physical >> 9, nr_vecs, GFP_NOFS); | |
5777 | if (!bio) | |
5778 | return -ENOMEM; | |
5779 | ||
5780 | while (bvec <= (first_bio->bi_io_vec + first_bio->bi_vcnt - 1)) { | |
5781 | if (bio_add_page(bio, bvec->bv_page, bvec->bv_len, | |
5782 | bvec->bv_offset) < bvec->bv_len) { | |
4f024f37 | 5783 | u64 len = bio->bi_iter.bi_size; |
de1ee92a JB |
5784 | |
5785 | atomic_inc(&bbio->stripes_pending); | |
5786 | submit_stripe_bio(root, bbio, bio, physical, dev_nr, | |
5787 | rw, async); | |
5788 | physical += len; | |
5789 | goto again; | |
5790 | } | |
5791 | bvec++; | |
5792 | } | |
5793 | ||
5794 | submit_stripe_bio(root, bbio, bio, physical, dev_nr, rw, async); | |
5795 | return 0; | |
5796 | } | |
5797 | ||
5798 | static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical) | |
5799 | { | |
5800 | atomic_inc(&bbio->error); | |
5801 | if (atomic_dec_and_test(&bbio->stripes_pending)) { | |
8408c716 MX |
5802 | /* Shoud be the original bio. */ |
5803 | WARN_ON(bio != bbio->orig_bio); | |
5804 | ||
de1ee92a JB |
5805 | bio->bi_private = bbio->private; |
5806 | bio->bi_end_io = bbio->end_io; | |
9be3395b | 5807 | btrfs_io_bio(bio)->mirror_num = bbio->mirror_num; |
4f024f37 | 5808 | bio->bi_iter.bi_sector = logical >> 9; |
8408c716 MX |
5809 | |
5810 | btrfs_end_bbio(bbio, bio, -EIO); | |
de1ee92a JB |
5811 | } |
5812 | } | |
5813 | ||
f188591e | 5814 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 5815 | int mirror_num, int async_submit) |
0b86a832 | 5816 | { |
0b86a832 | 5817 | struct btrfs_device *dev; |
8790d502 | 5818 | struct bio *first_bio = bio; |
4f024f37 | 5819 | u64 logical = (u64)bio->bi_iter.bi_sector << 9; |
0b86a832 CM |
5820 | u64 length = 0; |
5821 | u64 map_length; | |
0b86a832 | 5822 | int ret; |
8790d502 CM |
5823 | int dev_nr = 0; |
5824 | int total_devs = 1; | |
a1d3c478 | 5825 | struct btrfs_bio *bbio = NULL; |
0b86a832 | 5826 | |
4f024f37 | 5827 | length = bio->bi_iter.bi_size; |
0b86a832 | 5828 | map_length = length; |
cea9e445 | 5829 | |
c404e0dc | 5830 | btrfs_bio_counter_inc_blocked(root->fs_info); |
53b381b3 | 5831 | ret = __btrfs_map_block(root->fs_info, rw, logical, &map_length, &bbio, |
8e5cfb55 | 5832 | mirror_num, 1); |
c404e0dc MX |
5833 | if (ret) { |
5834 | btrfs_bio_counter_dec(root->fs_info); | |
79787eaa | 5835 | return ret; |
c404e0dc | 5836 | } |
cea9e445 | 5837 | |
a1d3c478 | 5838 | total_devs = bbio->num_stripes; |
53b381b3 DW |
5839 | bbio->orig_bio = first_bio; |
5840 | bbio->private = first_bio->bi_private; | |
5841 | bbio->end_io = first_bio->bi_end_io; | |
c404e0dc | 5842 | bbio->fs_info = root->fs_info; |
53b381b3 DW |
5843 | atomic_set(&bbio->stripes_pending, bbio->num_stripes); |
5844 | ||
8e5cfb55 | 5845 | if (bbio->raid_map) { |
53b381b3 DW |
5846 | /* In this case, map_length has been set to the length of |
5847 | a single stripe; not the whole write */ | |
5848 | if (rw & WRITE) { | |
8e5cfb55 | 5849 | ret = raid56_parity_write(root, bio, bbio, map_length); |
53b381b3 | 5850 | } else { |
8e5cfb55 | 5851 | ret = raid56_parity_recover(root, bio, bbio, map_length, |
4245215d | 5852 | mirror_num, 1); |
53b381b3 | 5853 | } |
4245215d | 5854 | |
c404e0dc MX |
5855 | btrfs_bio_counter_dec(root->fs_info); |
5856 | return ret; | |
53b381b3 DW |
5857 | } |
5858 | ||
cea9e445 | 5859 | if (map_length < length) { |
c2cf52eb | 5860 | btrfs_crit(root->fs_info, "mapping failed logical %llu bio len %llu len %llu", |
c1c9ff7c | 5861 | logical, length, map_length); |
cea9e445 CM |
5862 | BUG(); |
5863 | } | |
a1d3c478 | 5864 | |
d397712b | 5865 | while (dev_nr < total_devs) { |
de1ee92a JB |
5866 | dev = bbio->stripes[dev_nr].dev; |
5867 | if (!dev || !dev->bdev || (rw & WRITE && !dev->writeable)) { | |
5868 | bbio_error(bbio, first_bio, logical); | |
5869 | dev_nr++; | |
5870 | continue; | |
5871 | } | |
5872 | ||
5873 | /* | |
5874 | * Check and see if we're ok with this bio based on it's size | |
5875 | * and offset with the given device. | |
5876 | */ | |
5877 | if (!bio_size_ok(dev->bdev, first_bio, | |
5878 | bbio->stripes[dev_nr].physical >> 9)) { | |
5879 | ret = breakup_stripe_bio(root, bbio, first_bio, dev, | |
5880 | dev_nr, rw, async_submit); | |
5881 | BUG_ON(ret); | |
5882 | dev_nr++; | |
5883 | continue; | |
5884 | } | |
5885 | ||
a1d3c478 | 5886 | if (dev_nr < total_devs - 1) { |
9be3395b | 5887 | bio = btrfs_bio_clone(first_bio, GFP_NOFS); |
79787eaa | 5888 | BUG_ON(!bio); /* -ENOMEM */ |
a1d3c478 JS |
5889 | } else { |
5890 | bio = first_bio; | |
c55f1396 | 5891 | bbio->flags |= BTRFS_BIO_ORIG_BIO_SUBMITTED; |
8790d502 | 5892 | } |
de1ee92a JB |
5893 | |
5894 | submit_stripe_bio(root, bbio, bio, | |
5895 | bbio->stripes[dev_nr].physical, dev_nr, rw, | |
5896 | async_submit); | |
8790d502 CM |
5897 | dev_nr++; |
5898 | } | |
c404e0dc | 5899 | btrfs_bio_counter_dec(root->fs_info); |
0b86a832 CM |
5900 | return 0; |
5901 | } | |
5902 | ||
aa1b8cd4 | 5903 | struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid, |
2b82032c | 5904 | u8 *uuid, u8 *fsid) |
0b86a832 | 5905 | { |
2b82032c YZ |
5906 | struct btrfs_device *device; |
5907 | struct btrfs_fs_devices *cur_devices; | |
5908 | ||
aa1b8cd4 | 5909 | cur_devices = fs_info->fs_devices; |
2b82032c YZ |
5910 | while (cur_devices) { |
5911 | if (!fsid || | |
5912 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
5913 | device = __find_device(&cur_devices->devices, | |
5914 | devid, uuid); | |
5915 | if (device) | |
5916 | return device; | |
5917 | } | |
5918 | cur_devices = cur_devices->seed; | |
5919 | } | |
5920 | return NULL; | |
0b86a832 CM |
5921 | } |
5922 | ||
dfe25020 | 5923 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
5f375835 | 5924 | struct btrfs_fs_devices *fs_devices, |
dfe25020 CM |
5925 | u64 devid, u8 *dev_uuid) |
5926 | { | |
5927 | struct btrfs_device *device; | |
dfe25020 | 5928 | |
12bd2fc0 ID |
5929 | device = btrfs_alloc_device(NULL, &devid, dev_uuid); |
5930 | if (IS_ERR(device)) | |
7cbd8a83 | 5931 | return NULL; |
12bd2fc0 ID |
5932 | |
5933 | list_add(&device->dev_list, &fs_devices->devices); | |
e4404d6e | 5934 | device->fs_devices = fs_devices; |
dfe25020 | 5935 | fs_devices->num_devices++; |
12bd2fc0 ID |
5936 | |
5937 | device->missing = 1; | |
cd02dca5 | 5938 | fs_devices->missing_devices++; |
12bd2fc0 | 5939 | |
dfe25020 CM |
5940 | return device; |
5941 | } | |
5942 | ||
12bd2fc0 ID |
5943 | /** |
5944 | * btrfs_alloc_device - allocate struct btrfs_device | |
5945 | * @fs_info: used only for generating a new devid, can be NULL if | |
5946 | * devid is provided (i.e. @devid != NULL). | |
5947 | * @devid: a pointer to devid for this device. If NULL a new devid | |
5948 | * is generated. | |
5949 | * @uuid: a pointer to UUID for this device. If NULL a new UUID | |
5950 | * is generated. | |
5951 | * | |
5952 | * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR() | |
5953 | * on error. Returned struct is not linked onto any lists and can be | |
5954 | * destroyed with kfree() right away. | |
5955 | */ | |
5956 | struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, | |
5957 | const u64 *devid, | |
5958 | const u8 *uuid) | |
5959 | { | |
5960 | struct btrfs_device *dev; | |
5961 | u64 tmp; | |
5962 | ||
fae7f21c | 5963 | if (WARN_ON(!devid && !fs_info)) |
12bd2fc0 | 5964 | return ERR_PTR(-EINVAL); |
12bd2fc0 ID |
5965 | |
5966 | dev = __alloc_device(); | |
5967 | if (IS_ERR(dev)) | |
5968 | return dev; | |
5969 | ||
5970 | if (devid) | |
5971 | tmp = *devid; | |
5972 | else { | |
5973 | int ret; | |
5974 | ||
5975 | ret = find_next_devid(fs_info, &tmp); | |
5976 | if (ret) { | |
5977 | kfree(dev); | |
5978 | return ERR_PTR(ret); | |
5979 | } | |
5980 | } | |
5981 | dev->devid = tmp; | |
5982 | ||
5983 | if (uuid) | |
5984 | memcpy(dev->uuid, uuid, BTRFS_UUID_SIZE); | |
5985 | else | |
5986 | generate_random_uuid(dev->uuid); | |
5987 | ||
9e0af237 LB |
5988 | btrfs_init_work(&dev->work, btrfs_submit_helper, |
5989 | pending_bios_fn, NULL, NULL); | |
12bd2fc0 ID |
5990 | |
5991 | return dev; | |
5992 | } | |
5993 | ||
0b86a832 CM |
5994 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
5995 | struct extent_buffer *leaf, | |
5996 | struct btrfs_chunk *chunk) | |
5997 | { | |
5998 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
5999 | struct map_lookup *map; | |
6000 | struct extent_map *em; | |
6001 | u64 logical; | |
6002 | u64 length; | |
6003 | u64 devid; | |
a443755f | 6004 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 6005 | int num_stripes; |
0b86a832 | 6006 | int ret; |
593060d7 | 6007 | int i; |
0b86a832 | 6008 | |
e17cade2 CM |
6009 | logical = key->offset; |
6010 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 6011 | |
890871be | 6012 | read_lock(&map_tree->map_tree.lock); |
0b86a832 | 6013 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
890871be | 6014 | read_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
6015 | |
6016 | /* already mapped? */ | |
6017 | if (em && em->start <= logical && em->start + em->len > logical) { | |
6018 | free_extent_map(em); | |
0b86a832 CM |
6019 | return 0; |
6020 | } else if (em) { | |
6021 | free_extent_map(em); | |
6022 | } | |
0b86a832 | 6023 | |
172ddd60 | 6024 | em = alloc_extent_map(); |
0b86a832 CM |
6025 | if (!em) |
6026 | return -ENOMEM; | |
593060d7 CM |
6027 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
6028 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
6029 | if (!map) { |
6030 | free_extent_map(em); | |
6031 | return -ENOMEM; | |
6032 | } | |
6033 | ||
298a8f9c | 6034 | set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags); |
0b86a832 CM |
6035 | em->bdev = (struct block_device *)map; |
6036 | em->start = logical; | |
6037 | em->len = length; | |
70c8a91c | 6038 | em->orig_start = 0; |
0b86a832 | 6039 | em->block_start = 0; |
c8b97818 | 6040 | em->block_len = em->len; |
0b86a832 | 6041 | |
593060d7 CM |
6042 | map->num_stripes = num_stripes; |
6043 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
6044 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
6045 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
6046 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
6047 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 6048 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
6049 | for (i = 0; i < num_stripes; i++) { |
6050 | map->stripes[i].physical = | |
6051 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
6052 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
6053 | read_extent_buffer(leaf, uuid, (unsigned long) |
6054 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
6055 | BTRFS_UUID_SIZE); | |
aa1b8cd4 SB |
6056 | map->stripes[i].dev = btrfs_find_device(root->fs_info, devid, |
6057 | uuid, NULL); | |
dfe25020 | 6058 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
593060d7 CM |
6059 | free_extent_map(em); |
6060 | return -EIO; | |
6061 | } | |
dfe25020 CM |
6062 | if (!map->stripes[i].dev) { |
6063 | map->stripes[i].dev = | |
5f375835 MX |
6064 | add_missing_dev(root, root->fs_info->fs_devices, |
6065 | devid, uuid); | |
dfe25020 | 6066 | if (!map->stripes[i].dev) { |
dfe25020 CM |
6067 | free_extent_map(em); |
6068 | return -EIO; | |
6069 | } | |
6070 | } | |
6071 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
6072 | } |
6073 | ||
890871be | 6074 | write_lock(&map_tree->map_tree.lock); |
09a2a8f9 | 6075 | ret = add_extent_mapping(&map_tree->map_tree, em, 0); |
890871be | 6076 | write_unlock(&map_tree->map_tree.lock); |
79787eaa | 6077 | BUG_ON(ret); /* Tree corruption */ |
0b86a832 CM |
6078 | free_extent_map(em); |
6079 | ||
6080 | return 0; | |
6081 | } | |
6082 | ||
143bede5 | 6083 | static void fill_device_from_item(struct extent_buffer *leaf, |
0b86a832 CM |
6084 | struct btrfs_dev_item *dev_item, |
6085 | struct btrfs_device *device) | |
6086 | { | |
6087 | unsigned long ptr; | |
0b86a832 CM |
6088 | |
6089 | device->devid = btrfs_device_id(leaf, dev_item); | |
d6397bae CB |
6090 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
6091 | device->total_bytes = device->disk_total_bytes; | |
935e5cc9 | 6092 | device->commit_total_bytes = device->disk_total_bytes; |
0b86a832 | 6093 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
ce7213c7 | 6094 | device->commit_bytes_used = device->bytes_used; |
0b86a832 CM |
6095 | device->type = btrfs_device_type(leaf, dev_item); |
6096 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
6097 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
6098 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
8dabb742 | 6099 | WARN_ON(device->devid == BTRFS_DEV_REPLACE_DEVID); |
63a212ab | 6100 | device->is_tgtdev_for_dev_replace = 0; |
0b86a832 | 6101 | |
410ba3a2 | 6102 | ptr = btrfs_device_uuid(dev_item); |
e17cade2 | 6103 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 CM |
6104 | } |
6105 | ||
5f375835 MX |
6106 | static struct btrfs_fs_devices *open_seed_devices(struct btrfs_root *root, |
6107 | u8 *fsid) | |
2b82032c YZ |
6108 | { |
6109 | struct btrfs_fs_devices *fs_devices; | |
6110 | int ret; | |
6111 | ||
b367e47f | 6112 | BUG_ON(!mutex_is_locked(&uuid_mutex)); |
2b82032c YZ |
6113 | |
6114 | fs_devices = root->fs_info->fs_devices->seed; | |
6115 | while (fs_devices) { | |
5f375835 MX |
6116 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) |
6117 | return fs_devices; | |
6118 | ||
2b82032c YZ |
6119 | fs_devices = fs_devices->seed; |
6120 | } | |
6121 | ||
6122 | fs_devices = find_fsid(fsid); | |
6123 | if (!fs_devices) { | |
5f375835 MX |
6124 | if (!btrfs_test_opt(root, DEGRADED)) |
6125 | return ERR_PTR(-ENOENT); | |
6126 | ||
6127 | fs_devices = alloc_fs_devices(fsid); | |
6128 | if (IS_ERR(fs_devices)) | |
6129 | return fs_devices; | |
6130 | ||
6131 | fs_devices->seeding = 1; | |
6132 | fs_devices->opened = 1; | |
6133 | return fs_devices; | |
2b82032c | 6134 | } |
e4404d6e YZ |
6135 | |
6136 | fs_devices = clone_fs_devices(fs_devices); | |
5f375835 MX |
6137 | if (IS_ERR(fs_devices)) |
6138 | return fs_devices; | |
2b82032c | 6139 | |
97288f2c | 6140 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
15916de8 | 6141 | root->fs_info->bdev_holder); |
48d28232 JL |
6142 | if (ret) { |
6143 | free_fs_devices(fs_devices); | |
5f375835 | 6144 | fs_devices = ERR_PTR(ret); |
2b82032c | 6145 | goto out; |
48d28232 | 6146 | } |
2b82032c YZ |
6147 | |
6148 | if (!fs_devices->seeding) { | |
6149 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 6150 | free_fs_devices(fs_devices); |
5f375835 | 6151 | fs_devices = ERR_PTR(-EINVAL); |
2b82032c YZ |
6152 | goto out; |
6153 | } | |
6154 | ||
6155 | fs_devices->seed = root->fs_info->fs_devices->seed; | |
6156 | root->fs_info->fs_devices->seed = fs_devices; | |
2b82032c | 6157 | out: |
5f375835 | 6158 | return fs_devices; |
2b82032c YZ |
6159 | } |
6160 | ||
0d81ba5d | 6161 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
6162 | struct extent_buffer *leaf, |
6163 | struct btrfs_dev_item *dev_item) | |
6164 | { | |
5f375835 | 6165 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
0b86a832 CM |
6166 | struct btrfs_device *device; |
6167 | u64 devid; | |
6168 | int ret; | |
2b82032c | 6169 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
6170 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
6171 | ||
0b86a832 | 6172 | devid = btrfs_device_id(leaf, dev_item); |
410ba3a2 | 6173 | read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item), |
a443755f | 6174 | BTRFS_UUID_SIZE); |
1473b24e | 6175 | read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item), |
2b82032c YZ |
6176 | BTRFS_UUID_SIZE); |
6177 | ||
6178 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { | |
5f375835 MX |
6179 | fs_devices = open_seed_devices(root, fs_uuid); |
6180 | if (IS_ERR(fs_devices)) | |
6181 | return PTR_ERR(fs_devices); | |
2b82032c YZ |
6182 | } |
6183 | ||
aa1b8cd4 | 6184 | device = btrfs_find_device(root->fs_info, devid, dev_uuid, fs_uuid); |
5f375835 | 6185 | if (!device) { |
e4404d6e | 6186 | if (!btrfs_test_opt(root, DEGRADED)) |
2b82032c YZ |
6187 | return -EIO; |
6188 | ||
5f375835 MX |
6189 | btrfs_warn(root->fs_info, "devid %llu missing", devid); |
6190 | device = add_missing_dev(root, fs_devices, devid, dev_uuid); | |
6191 | if (!device) | |
6192 | return -ENOMEM; | |
6193 | } else { | |
6194 | if (!device->bdev && !btrfs_test_opt(root, DEGRADED)) | |
6195 | return -EIO; | |
6196 | ||
6197 | if(!device->bdev && !device->missing) { | |
cd02dca5 CM |
6198 | /* |
6199 | * this happens when a device that was properly setup | |
6200 | * in the device info lists suddenly goes bad. | |
6201 | * device->bdev is NULL, and so we have to set | |
6202 | * device->missing to one here | |
6203 | */ | |
5f375835 | 6204 | device->fs_devices->missing_devices++; |
cd02dca5 | 6205 | device->missing = 1; |
2b82032c | 6206 | } |
5f375835 MX |
6207 | |
6208 | /* Move the device to its own fs_devices */ | |
6209 | if (device->fs_devices != fs_devices) { | |
6210 | ASSERT(device->missing); | |
6211 | ||
6212 | list_move(&device->dev_list, &fs_devices->devices); | |
6213 | device->fs_devices->num_devices--; | |
6214 | fs_devices->num_devices++; | |
6215 | ||
6216 | device->fs_devices->missing_devices--; | |
6217 | fs_devices->missing_devices++; | |
6218 | ||
6219 | device->fs_devices = fs_devices; | |
6220 | } | |
2b82032c YZ |
6221 | } |
6222 | ||
6223 | if (device->fs_devices != root->fs_info->fs_devices) { | |
6224 | BUG_ON(device->writeable); | |
6225 | if (device->generation != | |
6226 | btrfs_device_generation(leaf, dev_item)) | |
6227 | return -EINVAL; | |
6324fbf3 | 6228 | } |
0b86a832 CM |
6229 | |
6230 | fill_device_from_item(leaf, dev_item, device); | |
dfe25020 | 6231 | device->in_fs_metadata = 1; |
63a212ab | 6232 | if (device->writeable && !device->is_tgtdev_for_dev_replace) { |
2b82032c | 6233 | device->fs_devices->total_rw_bytes += device->total_bytes; |
2bf64758 JB |
6234 | spin_lock(&root->fs_info->free_chunk_lock); |
6235 | root->fs_info->free_chunk_space += device->total_bytes - | |
6236 | device->bytes_used; | |
6237 | spin_unlock(&root->fs_info->free_chunk_lock); | |
6238 | } | |
0b86a832 | 6239 | ret = 0; |
0b86a832 CM |
6240 | return ret; |
6241 | } | |
6242 | ||
e4404d6e | 6243 | int btrfs_read_sys_array(struct btrfs_root *root) |
0b86a832 | 6244 | { |
6c41761f | 6245 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
a061fc8d | 6246 | struct extent_buffer *sb; |
0b86a832 | 6247 | struct btrfs_disk_key *disk_key; |
0b86a832 | 6248 | struct btrfs_chunk *chunk; |
1ffb22cf DS |
6249 | u8 *array_ptr; |
6250 | unsigned long sb_array_offset; | |
84eed90f | 6251 | int ret = 0; |
0b86a832 CM |
6252 | u32 num_stripes; |
6253 | u32 array_size; | |
6254 | u32 len = 0; | |
1ffb22cf | 6255 | u32 cur_offset; |
84eed90f | 6256 | struct btrfs_key key; |
0b86a832 | 6257 | |
a83fffb7 DS |
6258 | ASSERT(BTRFS_SUPER_INFO_SIZE <= root->nodesize); |
6259 | /* | |
6260 | * This will create extent buffer of nodesize, superblock size is | |
6261 | * fixed to BTRFS_SUPER_INFO_SIZE. If nodesize > sb size, this will | |
6262 | * overallocate but we can keep it as-is, only the first page is used. | |
6263 | */ | |
6264 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET); | |
a061fc8d CM |
6265 | if (!sb) |
6266 | return -ENOMEM; | |
6267 | btrfs_set_buffer_uptodate(sb); | |
85d4e461 | 6268 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0); |
8a334426 DS |
6269 | /* |
6270 | * The sb extent buffer is artifical and just used to read the system array. | |
6271 | * btrfs_set_buffer_uptodate() call does not properly mark all it's | |
6272 | * pages up-to-date when the page is larger: extent does not cover the | |
6273 | * whole page and consequently check_page_uptodate does not find all | |
6274 | * the page's extents up-to-date (the hole beyond sb), | |
6275 | * write_extent_buffer then triggers a WARN_ON. | |
6276 | * | |
6277 | * Regular short extents go through mark_extent_buffer_dirty/writeback cycle, | |
6278 | * but sb spans only this function. Add an explicit SetPageUptodate call | |
6279 | * to silence the warning eg. on PowerPC 64. | |
6280 | */ | |
6281 | if (PAGE_CACHE_SIZE > BTRFS_SUPER_INFO_SIZE) | |
727011e0 | 6282 | SetPageUptodate(sb->pages[0]); |
4008c04a | 6283 | |
a061fc8d | 6284 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
6285 | array_size = btrfs_super_sys_array_size(super_copy); |
6286 | ||
1ffb22cf DS |
6287 | array_ptr = super_copy->sys_chunk_array; |
6288 | sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array); | |
6289 | cur_offset = 0; | |
0b86a832 | 6290 | |
1ffb22cf DS |
6291 | while (cur_offset < array_size) { |
6292 | disk_key = (struct btrfs_disk_key *)array_ptr; | |
e3540eab DS |
6293 | len = sizeof(*disk_key); |
6294 | if (cur_offset + len > array_size) | |
6295 | goto out_short_read; | |
6296 | ||
0b86a832 CM |
6297 | btrfs_disk_key_to_cpu(&key, disk_key); |
6298 | ||
1ffb22cf DS |
6299 | array_ptr += len; |
6300 | sb_array_offset += len; | |
6301 | cur_offset += len; | |
0b86a832 | 6302 | |
0d81ba5d | 6303 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
1ffb22cf | 6304 | chunk = (struct btrfs_chunk *)sb_array_offset; |
e3540eab DS |
6305 | /* |
6306 | * At least one btrfs_chunk with one stripe must be | |
6307 | * present, exact stripe count check comes afterwards | |
6308 | */ | |
6309 | len = btrfs_chunk_item_size(1); | |
6310 | if (cur_offset + len > array_size) | |
6311 | goto out_short_read; | |
6312 | ||
6313 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); | |
6314 | len = btrfs_chunk_item_size(num_stripes); | |
6315 | if (cur_offset + len > array_size) | |
6316 | goto out_short_read; | |
6317 | ||
0d81ba5d | 6318 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
6319 | if (ret) |
6320 | break; | |
0b86a832 | 6321 | } else { |
84eed90f CM |
6322 | ret = -EIO; |
6323 | break; | |
0b86a832 | 6324 | } |
1ffb22cf DS |
6325 | array_ptr += len; |
6326 | sb_array_offset += len; | |
6327 | cur_offset += len; | |
0b86a832 | 6328 | } |
a061fc8d | 6329 | free_extent_buffer(sb); |
84eed90f | 6330 | return ret; |
e3540eab DS |
6331 | |
6332 | out_short_read: | |
6333 | printk(KERN_ERR "BTRFS: sys_array too short to read %u bytes at offset %u\n", | |
6334 | len, cur_offset); | |
6335 | free_extent_buffer(sb); | |
6336 | return -EIO; | |
0b86a832 CM |
6337 | } |
6338 | ||
6339 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
6340 | { | |
6341 | struct btrfs_path *path; | |
6342 | struct extent_buffer *leaf; | |
6343 | struct btrfs_key key; | |
6344 | struct btrfs_key found_key; | |
6345 | int ret; | |
6346 | int slot; | |
6347 | ||
6348 | root = root->fs_info->chunk_root; | |
6349 | ||
6350 | path = btrfs_alloc_path(); | |
6351 | if (!path) | |
6352 | return -ENOMEM; | |
6353 | ||
b367e47f LZ |
6354 | mutex_lock(&uuid_mutex); |
6355 | lock_chunks(root); | |
6356 | ||
395927a9 FDBM |
6357 | /* |
6358 | * Read all device items, and then all the chunk items. All | |
6359 | * device items are found before any chunk item (their object id | |
6360 | * is smaller than the lowest possible object id for a chunk | |
6361 | * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID). | |
0b86a832 CM |
6362 | */ |
6363 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
6364 | key.offset = 0; | |
6365 | key.type = 0; | |
0b86a832 | 6366 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
ab59381e ZL |
6367 | if (ret < 0) |
6368 | goto error; | |
d397712b | 6369 | while (1) { |
0b86a832 CM |
6370 | leaf = path->nodes[0]; |
6371 | slot = path->slots[0]; | |
6372 | if (slot >= btrfs_header_nritems(leaf)) { | |
6373 | ret = btrfs_next_leaf(root, path); | |
6374 | if (ret == 0) | |
6375 | continue; | |
6376 | if (ret < 0) | |
6377 | goto error; | |
6378 | break; | |
6379 | } | |
6380 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
395927a9 FDBM |
6381 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { |
6382 | struct btrfs_dev_item *dev_item; | |
6383 | dev_item = btrfs_item_ptr(leaf, slot, | |
0b86a832 | 6384 | struct btrfs_dev_item); |
395927a9 FDBM |
6385 | ret = read_one_dev(root, leaf, dev_item); |
6386 | if (ret) | |
6387 | goto error; | |
0b86a832 CM |
6388 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { |
6389 | struct btrfs_chunk *chunk; | |
6390 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
6391 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2b82032c YZ |
6392 | if (ret) |
6393 | goto error; | |
0b86a832 CM |
6394 | } |
6395 | path->slots[0]++; | |
6396 | } | |
0b86a832 CM |
6397 | ret = 0; |
6398 | error: | |
b367e47f LZ |
6399 | unlock_chunks(root); |
6400 | mutex_unlock(&uuid_mutex); | |
6401 | ||
2b82032c | 6402 | btrfs_free_path(path); |
0b86a832 CM |
6403 | return ret; |
6404 | } | |
442a4f63 | 6405 | |
cb517eab MX |
6406 | void btrfs_init_devices_late(struct btrfs_fs_info *fs_info) |
6407 | { | |
6408 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6409 | struct btrfs_device *device; | |
6410 | ||
29cc83f6 LB |
6411 | while (fs_devices) { |
6412 | mutex_lock(&fs_devices->device_list_mutex); | |
6413 | list_for_each_entry(device, &fs_devices->devices, dev_list) | |
6414 | device->dev_root = fs_info->dev_root; | |
6415 | mutex_unlock(&fs_devices->device_list_mutex); | |
6416 | ||
6417 | fs_devices = fs_devices->seed; | |
6418 | } | |
cb517eab MX |
6419 | } |
6420 | ||
733f4fbb SB |
6421 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev) |
6422 | { | |
6423 | int i; | |
6424 | ||
6425 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6426 | btrfs_dev_stat_reset(dev, i); | |
6427 | } | |
6428 | ||
6429 | int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info) | |
6430 | { | |
6431 | struct btrfs_key key; | |
6432 | struct btrfs_key found_key; | |
6433 | struct btrfs_root *dev_root = fs_info->dev_root; | |
6434 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6435 | struct extent_buffer *eb; | |
6436 | int slot; | |
6437 | int ret = 0; | |
6438 | struct btrfs_device *device; | |
6439 | struct btrfs_path *path = NULL; | |
6440 | int i; | |
6441 | ||
6442 | path = btrfs_alloc_path(); | |
6443 | if (!path) { | |
6444 | ret = -ENOMEM; | |
6445 | goto out; | |
6446 | } | |
6447 | ||
6448 | mutex_lock(&fs_devices->device_list_mutex); | |
6449 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
6450 | int item_size; | |
6451 | struct btrfs_dev_stats_item *ptr; | |
6452 | ||
6453 | key.objectid = 0; | |
6454 | key.type = BTRFS_DEV_STATS_KEY; | |
6455 | key.offset = device->devid; | |
6456 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
6457 | if (ret) { | |
733f4fbb SB |
6458 | __btrfs_reset_dev_stats(device); |
6459 | device->dev_stats_valid = 1; | |
6460 | btrfs_release_path(path); | |
6461 | continue; | |
6462 | } | |
6463 | slot = path->slots[0]; | |
6464 | eb = path->nodes[0]; | |
6465 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
6466 | item_size = btrfs_item_size_nr(eb, slot); | |
6467 | ||
6468 | ptr = btrfs_item_ptr(eb, slot, | |
6469 | struct btrfs_dev_stats_item); | |
6470 | ||
6471 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { | |
6472 | if (item_size >= (1 + i) * sizeof(__le64)) | |
6473 | btrfs_dev_stat_set(device, i, | |
6474 | btrfs_dev_stats_value(eb, ptr, i)); | |
6475 | else | |
6476 | btrfs_dev_stat_reset(device, i); | |
6477 | } | |
6478 | ||
6479 | device->dev_stats_valid = 1; | |
6480 | btrfs_dev_stat_print_on_load(device); | |
6481 | btrfs_release_path(path); | |
6482 | } | |
6483 | mutex_unlock(&fs_devices->device_list_mutex); | |
6484 | ||
6485 | out: | |
6486 | btrfs_free_path(path); | |
6487 | return ret < 0 ? ret : 0; | |
6488 | } | |
6489 | ||
6490 | static int update_dev_stat_item(struct btrfs_trans_handle *trans, | |
6491 | struct btrfs_root *dev_root, | |
6492 | struct btrfs_device *device) | |
6493 | { | |
6494 | struct btrfs_path *path; | |
6495 | struct btrfs_key key; | |
6496 | struct extent_buffer *eb; | |
6497 | struct btrfs_dev_stats_item *ptr; | |
6498 | int ret; | |
6499 | int i; | |
6500 | ||
6501 | key.objectid = 0; | |
6502 | key.type = BTRFS_DEV_STATS_KEY; | |
6503 | key.offset = device->devid; | |
6504 | ||
6505 | path = btrfs_alloc_path(); | |
6506 | BUG_ON(!path); | |
6507 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
6508 | if (ret < 0) { | |
efe120a0 FH |
6509 | printk_in_rcu(KERN_WARNING "BTRFS: " |
6510 | "error %d while searching for dev_stats item for device %s!\n", | |
606686ee | 6511 | ret, rcu_str_deref(device->name)); |
733f4fbb SB |
6512 | goto out; |
6513 | } | |
6514 | ||
6515 | if (ret == 0 && | |
6516 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
6517 | /* need to delete old one and insert a new one */ | |
6518 | ret = btrfs_del_item(trans, dev_root, path); | |
6519 | if (ret != 0) { | |
efe120a0 FH |
6520 | printk_in_rcu(KERN_WARNING "BTRFS: " |
6521 | "delete too small dev_stats item for device %s failed %d!\n", | |
606686ee | 6522 | rcu_str_deref(device->name), ret); |
733f4fbb SB |
6523 | goto out; |
6524 | } | |
6525 | ret = 1; | |
6526 | } | |
6527 | ||
6528 | if (ret == 1) { | |
6529 | /* need to insert a new item */ | |
6530 | btrfs_release_path(path); | |
6531 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
6532 | &key, sizeof(*ptr)); | |
6533 | if (ret < 0) { | |
efe120a0 FH |
6534 | printk_in_rcu(KERN_WARNING "BTRFS: " |
6535 | "insert dev_stats item for device %s failed %d!\n", | |
606686ee | 6536 | rcu_str_deref(device->name), ret); |
733f4fbb SB |
6537 | goto out; |
6538 | } | |
6539 | } | |
6540 | ||
6541 | eb = path->nodes[0]; | |
6542 | ptr = btrfs_item_ptr(eb, path->slots[0], struct btrfs_dev_stats_item); | |
6543 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6544 | btrfs_set_dev_stats_value(eb, ptr, i, | |
6545 | btrfs_dev_stat_read(device, i)); | |
6546 | btrfs_mark_buffer_dirty(eb); | |
6547 | ||
6548 | out: | |
6549 | btrfs_free_path(path); | |
6550 | return ret; | |
6551 | } | |
6552 | ||
6553 | /* | |
6554 | * called from commit_transaction. Writes all changed device stats to disk. | |
6555 | */ | |
6556 | int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, | |
6557 | struct btrfs_fs_info *fs_info) | |
6558 | { | |
6559 | struct btrfs_root *dev_root = fs_info->dev_root; | |
6560 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6561 | struct btrfs_device *device; | |
addc3fa7 | 6562 | int stats_cnt; |
733f4fbb SB |
6563 | int ret = 0; |
6564 | ||
6565 | mutex_lock(&fs_devices->device_list_mutex); | |
6566 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
addc3fa7 | 6567 | if (!device->dev_stats_valid || !btrfs_dev_stats_dirty(device)) |
733f4fbb SB |
6568 | continue; |
6569 | ||
addc3fa7 | 6570 | stats_cnt = atomic_read(&device->dev_stats_ccnt); |
733f4fbb SB |
6571 | ret = update_dev_stat_item(trans, dev_root, device); |
6572 | if (!ret) | |
addc3fa7 | 6573 | atomic_sub(stats_cnt, &device->dev_stats_ccnt); |
733f4fbb SB |
6574 | } |
6575 | mutex_unlock(&fs_devices->device_list_mutex); | |
6576 | ||
6577 | return ret; | |
6578 | } | |
6579 | ||
442a4f63 SB |
6580 | void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index) |
6581 | { | |
6582 | btrfs_dev_stat_inc(dev, index); | |
6583 | btrfs_dev_stat_print_on_error(dev); | |
6584 | } | |
6585 | ||
48a3b636 | 6586 | static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev) |
442a4f63 | 6587 | { |
733f4fbb SB |
6588 | if (!dev->dev_stats_valid) |
6589 | return; | |
efe120a0 FH |
6590 | printk_ratelimited_in_rcu(KERN_ERR "BTRFS: " |
6591 | "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n", | |
606686ee | 6592 | rcu_str_deref(dev->name), |
442a4f63 SB |
6593 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
6594 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
6595 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
efe120a0 FH |
6596 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS), |
6597 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
442a4f63 | 6598 | } |
c11d2c23 | 6599 | |
733f4fbb SB |
6600 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev) |
6601 | { | |
a98cdb85 SB |
6602 | int i; |
6603 | ||
6604 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6605 | if (btrfs_dev_stat_read(dev, i) != 0) | |
6606 | break; | |
6607 | if (i == BTRFS_DEV_STAT_VALUES_MAX) | |
6608 | return; /* all values == 0, suppress message */ | |
6609 | ||
efe120a0 FH |
6610 | printk_in_rcu(KERN_INFO "BTRFS: " |
6611 | "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n", | |
606686ee | 6612 | rcu_str_deref(dev->name), |
733f4fbb SB |
6613 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
6614 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
6615 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
6616 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS), | |
6617 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
6618 | } | |
6619 | ||
c11d2c23 | 6620 | int btrfs_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 6621 | struct btrfs_ioctl_get_dev_stats *stats) |
c11d2c23 SB |
6622 | { |
6623 | struct btrfs_device *dev; | |
6624 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
6625 | int i; | |
6626 | ||
6627 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 6628 | dev = btrfs_find_device(root->fs_info, stats->devid, NULL, NULL); |
c11d2c23 SB |
6629 | mutex_unlock(&fs_devices->device_list_mutex); |
6630 | ||
6631 | if (!dev) { | |
efe120a0 | 6632 | btrfs_warn(root->fs_info, "get dev_stats failed, device not found"); |
c11d2c23 | 6633 | return -ENODEV; |
733f4fbb | 6634 | } else if (!dev->dev_stats_valid) { |
efe120a0 | 6635 | btrfs_warn(root->fs_info, "get dev_stats failed, not yet valid"); |
733f4fbb | 6636 | return -ENODEV; |
b27f7c0c | 6637 | } else if (stats->flags & BTRFS_DEV_STATS_RESET) { |
c11d2c23 SB |
6638 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { |
6639 | if (stats->nr_items > i) | |
6640 | stats->values[i] = | |
6641 | btrfs_dev_stat_read_and_reset(dev, i); | |
6642 | else | |
6643 | btrfs_dev_stat_reset(dev, i); | |
6644 | } | |
6645 | } else { | |
6646 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
6647 | if (stats->nr_items > i) | |
6648 | stats->values[i] = btrfs_dev_stat_read(dev, i); | |
6649 | } | |
6650 | if (stats->nr_items > BTRFS_DEV_STAT_VALUES_MAX) | |
6651 | stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX; | |
6652 | return 0; | |
6653 | } | |
a8a6dab7 SB |
6654 | |
6655 | int btrfs_scratch_superblock(struct btrfs_device *device) | |
6656 | { | |
6657 | struct buffer_head *bh; | |
6658 | struct btrfs_super_block *disk_super; | |
6659 | ||
6660 | bh = btrfs_read_dev_super(device->bdev); | |
6661 | if (!bh) | |
6662 | return -EINVAL; | |
6663 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
6664 | ||
6665 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
6666 | set_buffer_dirty(bh); | |
6667 | sync_dirty_buffer(bh); | |
6668 | brelse(bh); | |
6669 | ||
6670 | return 0; | |
6671 | } | |
935e5cc9 MX |
6672 | |
6673 | /* | |
6674 | * Update the size of all devices, which is used for writing out the | |
6675 | * super blocks. | |
6676 | */ | |
6677 | void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info) | |
6678 | { | |
6679 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
6680 | struct btrfs_device *curr, *next; | |
6681 | ||
6682 | if (list_empty(&fs_devices->resized_devices)) | |
6683 | return; | |
6684 | ||
6685 | mutex_lock(&fs_devices->device_list_mutex); | |
6686 | lock_chunks(fs_info->dev_root); | |
6687 | list_for_each_entry_safe(curr, next, &fs_devices->resized_devices, | |
6688 | resized_list) { | |
6689 | list_del_init(&curr->resized_list); | |
6690 | curr->commit_total_bytes = curr->disk_total_bytes; | |
6691 | } | |
6692 | unlock_chunks(fs_info->dev_root); | |
6693 | mutex_unlock(&fs_devices->device_list_mutex); | |
6694 | } | |
ce7213c7 MX |
6695 | |
6696 | /* Must be invoked during the transaction commit */ | |
6697 | void btrfs_update_commit_device_bytes_used(struct btrfs_root *root, | |
6698 | struct btrfs_transaction *transaction) | |
6699 | { | |
6700 | struct extent_map *em; | |
6701 | struct map_lookup *map; | |
6702 | struct btrfs_device *dev; | |
6703 | int i; | |
6704 | ||
6705 | if (list_empty(&transaction->pending_chunks)) | |
6706 | return; | |
6707 | ||
6708 | /* In order to kick the device replace finish process */ | |
6709 | lock_chunks(root); | |
6710 | list_for_each_entry(em, &transaction->pending_chunks, list) { | |
6711 | map = (struct map_lookup *)em->bdev; | |
6712 | ||
6713 | for (i = 0; i < map->num_stripes; i++) { | |
6714 | dev = map->stripes[i].dev; | |
6715 | dev->commit_bytes_used = dev->bytes_used; | |
6716 | } | |
6717 | } | |
6718 | unlock_chunks(root); | |
6719 | } |