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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> |
593060d7 | 28 | #include <asm/div64.h> |
4b4e25f2 | 29 | #include "compat.h" |
0b86a832 CM |
30 | #include "ctree.h" |
31 | #include "extent_map.h" | |
32 | #include "disk-io.h" | |
33 | #include "transaction.h" | |
34 | #include "print-tree.h" | |
35 | #include "volumes.h" | |
8b712842 | 36 | #include "async-thread.h" |
21adbd5c | 37 | #include "check-integrity.h" |
606686ee | 38 | #include "rcu-string.h" |
0b86a832 | 39 | |
2b82032c YZ |
40 | static int init_first_rw_device(struct btrfs_trans_handle *trans, |
41 | struct btrfs_root *root, | |
42 | struct btrfs_device *device); | |
43 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root); | |
733f4fbb SB |
44 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev); |
45 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *device); | |
2b82032c | 46 | |
8a4b83cc CM |
47 | static DEFINE_MUTEX(uuid_mutex); |
48 | static LIST_HEAD(fs_uuids); | |
49 | ||
7d9eb12c CM |
50 | static void lock_chunks(struct btrfs_root *root) |
51 | { | |
7d9eb12c CM |
52 | mutex_lock(&root->fs_info->chunk_mutex); |
53 | } | |
54 | ||
55 | static void unlock_chunks(struct btrfs_root *root) | |
56 | { | |
7d9eb12c CM |
57 | mutex_unlock(&root->fs_info->chunk_mutex); |
58 | } | |
59 | ||
e4404d6e YZ |
60 | static void free_fs_devices(struct btrfs_fs_devices *fs_devices) |
61 | { | |
62 | struct btrfs_device *device; | |
63 | WARN_ON(fs_devices->opened); | |
64 | while (!list_empty(&fs_devices->devices)) { | |
65 | device = list_entry(fs_devices->devices.next, | |
66 | struct btrfs_device, dev_list); | |
67 | list_del(&device->dev_list); | |
606686ee | 68 | rcu_string_free(device->name); |
e4404d6e YZ |
69 | kfree(device); |
70 | } | |
71 | kfree(fs_devices); | |
72 | } | |
73 | ||
143bede5 | 74 | void btrfs_cleanup_fs_uuids(void) |
8a4b83cc CM |
75 | { |
76 | struct btrfs_fs_devices *fs_devices; | |
8a4b83cc | 77 | |
2b82032c YZ |
78 | while (!list_empty(&fs_uuids)) { |
79 | fs_devices = list_entry(fs_uuids.next, | |
80 | struct btrfs_fs_devices, list); | |
81 | list_del(&fs_devices->list); | |
e4404d6e | 82 | free_fs_devices(fs_devices); |
8a4b83cc | 83 | } |
8a4b83cc CM |
84 | } |
85 | ||
a1b32a59 CM |
86 | static noinline struct btrfs_device *__find_device(struct list_head *head, |
87 | u64 devid, u8 *uuid) | |
8a4b83cc CM |
88 | { |
89 | struct btrfs_device *dev; | |
8a4b83cc | 90 | |
c6e30871 | 91 | list_for_each_entry(dev, head, dev_list) { |
a443755f | 92 | if (dev->devid == devid && |
8f18cf13 | 93 | (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { |
8a4b83cc | 94 | return dev; |
a443755f | 95 | } |
8a4b83cc CM |
96 | } |
97 | return NULL; | |
98 | } | |
99 | ||
a1b32a59 | 100 | static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid) |
8a4b83cc | 101 | { |
8a4b83cc CM |
102 | struct btrfs_fs_devices *fs_devices; |
103 | ||
c6e30871 | 104 | list_for_each_entry(fs_devices, &fs_uuids, list) { |
8a4b83cc CM |
105 | if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) |
106 | return fs_devices; | |
107 | } | |
108 | return NULL; | |
109 | } | |
110 | ||
ffbd517d CM |
111 | static void requeue_list(struct btrfs_pending_bios *pending_bios, |
112 | struct bio *head, struct bio *tail) | |
113 | { | |
114 | ||
115 | struct bio *old_head; | |
116 | ||
117 | old_head = pending_bios->head; | |
118 | pending_bios->head = head; | |
119 | if (pending_bios->tail) | |
120 | tail->bi_next = old_head; | |
121 | else | |
122 | pending_bios->tail = tail; | |
123 | } | |
124 | ||
8b712842 CM |
125 | /* |
126 | * we try to collect pending bios for a device so we don't get a large | |
127 | * number of procs sending bios down to the same device. This greatly | |
128 | * improves the schedulers ability to collect and merge the bios. | |
129 | * | |
130 | * But, it also turns into a long list of bios to process and that is sure | |
131 | * to eventually make the worker thread block. The solution here is to | |
132 | * make some progress and then put this work struct back at the end of | |
133 | * the list if the block device is congested. This way, multiple devices | |
134 | * can make progress from a single worker thread. | |
135 | */ | |
143bede5 | 136 | static noinline void run_scheduled_bios(struct btrfs_device *device) |
8b712842 CM |
137 | { |
138 | struct bio *pending; | |
139 | struct backing_dev_info *bdi; | |
b64a2851 | 140 | struct btrfs_fs_info *fs_info; |
ffbd517d | 141 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
142 | struct bio *tail; |
143 | struct bio *cur; | |
144 | int again = 0; | |
ffbd517d | 145 | unsigned long num_run; |
d644d8a1 | 146 | unsigned long batch_run = 0; |
b64a2851 | 147 | unsigned long limit; |
b765ead5 | 148 | unsigned long last_waited = 0; |
d84275c9 | 149 | int force_reg = 0; |
0e588859 | 150 | int sync_pending = 0; |
211588ad CM |
151 | struct blk_plug plug; |
152 | ||
153 | /* | |
154 | * this function runs all the bios we've collected for | |
155 | * a particular device. We don't want to wander off to | |
156 | * another device without first sending all of these down. | |
157 | * So, setup a plug here and finish it off before we return | |
158 | */ | |
159 | blk_start_plug(&plug); | |
8b712842 | 160 | |
bedf762b | 161 | bdi = blk_get_backing_dev_info(device->bdev); |
b64a2851 CM |
162 | fs_info = device->dev_root->fs_info; |
163 | limit = btrfs_async_submit_limit(fs_info); | |
164 | limit = limit * 2 / 3; | |
165 | ||
8b712842 CM |
166 | loop: |
167 | spin_lock(&device->io_lock); | |
168 | ||
a6837051 | 169 | loop_lock: |
d84275c9 | 170 | num_run = 0; |
ffbd517d | 171 | |
8b712842 CM |
172 | /* take all the bios off the list at once and process them |
173 | * later on (without the lock held). But, remember the | |
174 | * tail and other pointers so the bios can be properly reinserted | |
175 | * into the list if we hit congestion | |
176 | */ | |
d84275c9 | 177 | if (!force_reg && device->pending_sync_bios.head) { |
ffbd517d | 178 | pending_bios = &device->pending_sync_bios; |
d84275c9 CM |
179 | force_reg = 1; |
180 | } else { | |
ffbd517d | 181 | pending_bios = &device->pending_bios; |
d84275c9 CM |
182 | force_reg = 0; |
183 | } | |
ffbd517d CM |
184 | |
185 | pending = pending_bios->head; | |
186 | tail = pending_bios->tail; | |
8b712842 | 187 | WARN_ON(pending && !tail); |
8b712842 CM |
188 | |
189 | /* | |
190 | * if pending was null this time around, no bios need processing | |
191 | * at all and we can stop. Otherwise it'll loop back up again | |
192 | * and do an additional check so no bios are missed. | |
193 | * | |
194 | * device->running_pending is used to synchronize with the | |
195 | * schedule_bio code. | |
196 | */ | |
ffbd517d CM |
197 | if (device->pending_sync_bios.head == NULL && |
198 | device->pending_bios.head == NULL) { | |
8b712842 CM |
199 | again = 0; |
200 | device->running_pending = 0; | |
ffbd517d CM |
201 | } else { |
202 | again = 1; | |
203 | device->running_pending = 1; | |
8b712842 | 204 | } |
ffbd517d CM |
205 | |
206 | pending_bios->head = NULL; | |
207 | pending_bios->tail = NULL; | |
208 | ||
8b712842 CM |
209 | spin_unlock(&device->io_lock); |
210 | ||
d397712b | 211 | while (pending) { |
ffbd517d CM |
212 | |
213 | rmb(); | |
d84275c9 CM |
214 | /* we want to work on both lists, but do more bios on the |
215 | * sync list than the regular list | |
216 | */ | |
217 | if ((num_run > 32 && | |
218 | pending_bios != &device->pending_sync_bios && | |
219 | device->pending_sync_bios.head) || | |
220 | (num_run > 64 && pending_bios == &device->pending_sync_bios && | |
221 | device->pending_bios.head)) { | |
ffbd517d CM |
222 | spin_lock(&device->io_lock); |
223 | requeue_list(pending_bios, pending, tail); | |
224 | goto loop_lock; | |
225 | } | |
226 | ||
8b712842 CM |
227 | cur = pending; |
228 | pending = pending->bi_next; | |
229 | cur->bi_next = NULL; | |
b64a2851 | 230 | |
66657b31 | 231 | if (atomic_dec_return(&fs_info->nr_async_bios) < limit && |
b64a2851 CM |
232 | waitqueue_active(&fs_info->async_submit_wait)) |
233 | wake_up(&fs_info->async_submit_wait); | |
492bb6de CM |
234 | |
235 | BUG_ON(atomic_read(&cur->bi_cnt) == 0); | |
d644d8a1 | 236 | |
2ab1ba68 CM |
237 | /* |
238 | * if we're doing the sync list, record that our | |
239 | * plug has some sync requests on it | |
240 | * | |
241 | * If we're doing the regular list and there are | |
242 | * sync requests sitting around, unplug before | |
243 | * we add more | |
244 | */ | |
245 | if (pending_bios == &device->pending_sync_bios) { | |
246 | sync_pending = 1; | |
247 | } else if (sync_pending) { | |
248 | blk_finish_plug(&plug); | |
249 | blk_start_plug(&plug); | |
250 | sync_pending = 0; | |
251 | } | |
252 | ||
21adbd5c | 253 | btrfsic_submit_bio(cur->bi_rw, cur); |
5ff7ba3a CM |
254 | num_run++; |
255 | batch_run++; | |
7eaceacc | 256 | if (need_resched()) |
ffbd517d | 257 | cond_resched(); |
8b712842 CM |
258 | |
259 | /* | |
260 | * we made progress, there is more work to do and the bdi | |
261 | * is now congested. Back off and let other work structs | |
262 | * run instead | |
263 | */ | |
57fd5a5f | 264 | if (pending && bdi_write_congested(bdi) && batch_run > 8 && |
5f2cc086 | 265 | fs_info->fs_devices->open_devices > 1) { |
b765ead5 | 266 | struct io_context *ioc; |
8b712842 | 267 | |
b765ead5 CM |
268 | ioc = current->io_context; |
269 | ||
270 | /* | |
271 | * the main goal here is that we don't want to | |
272 | * block if we're going to be able to submit | |
273 | * more requests without blocking. | |
274 | * | |
275 | * This code does two great things, it pokes into | |
276 | * the elevator code from a filesystem _and_ | |
277 | * it makes assumptions about how batching works. | |
278 | */ | |
279 | if (ioc && ioc->nr_batch_requests > 0 && | |
280 | time_before(jiffies, ioc->last_waited + HZ/50UL) && | |
281 | (last_waited == 0 || | |
282 | ioc->last_waited == last_waited)) { | |
283 | /* | |
284 | * we want to go through our batch of | |
285 | * requests and stop. So, we copy out | |
286 | * the ioc->last_waited time and test | |
287 | * against it before looping | |
288 | */ | |
289 | last_waited = ioc->last_waited; | |
7eaceacc | 290 | if (need_resched()) |
ffbd517d | 291 | cond_resched(); |
b765ead5 CM |
292 | continue; |
293 | } | |
8b712842 | 294 | spin_lock(&device->io_lock); |
ffbd517d | 295 | requeue_list(pending_bios, pending, tail); |
a6837051 | 296 | device->running_pending = 1; |
8b712842 CM |
297 | |
298 | spin_unlock(&device->io_lock); | |
299 | btrfs_requeue_work(&device->work); | |
300 | goto done; | |
301 | } | |
d85c8a6f CM |
302 | /* unplug every 64 requests just for good measure */ |
303 | if (batch_run % 64 == 0) { | |
304 | blk_finish_plug(&plug); | |
305 | blk_start_plug(&plug); | |
306 | sync_pending = 0; | |
307 | } | |
8b712842 | 308 | } |
ffbd517d | 309 | |
51684082 CM |
310 | cond_resched(); |
311 | if (again) | |
312 | goto loop; | |
313 | ||
314 | spin_lock(&device->io_lock); | |
315 | if (device->pending_bios.head || device->pending_sync_bios.head) | |
316 | goto loop_lock; | |
317 | spin_unlock(&device->io_lock); | |
318 | ||
8b712842 | 319 | done: |
211588ad | 320 | blk_finish_plug(&plug); |
8b712842 CM |
321 | } |
322 | ||
b2950863 | 323 | static void pending_bios_fn(struct btrfs_work *work) |
8b712842 CM |
324 | { |
325 | struct btrfs_device *device; | |
326 | ||
327 | device = container_of(work, struct btrfs_device, work); | |
328 | run_scheduled_bios(device); | |
329 | } | |
330 | ||
a1b32a59 | 331 | static noinline int device_list_add(const char *path, |
8a4b83cc CM |
332 | struct btrfs_super_block *disk_super, |
333 | u64 devid, struct btrfs_fs_devices **fs_devices_ret) | |
334 | { | |
335 | struct btrfs_device *device; | |
336 | struct btrfs_fs_devices *fs_devices; | |
606686ee | 337 | struct rcu_string *name; |
8a4b83cc CM |
338 | u64 found_transid = btrfs_super_generation(disk_super); |
339 | ||
340 | fs_devices = find_fsid(disk_super->fsid); | |
341 | if (!fs_devices) { | |
515dc322 | 342 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
8a4b83cc CM |
343 | if (!fs_devices) |
344 | return -ENOMEM; | |
345 | INIT_LIST_HEAD(&fs_devices->devices); | |
b3075717 | 346 | INIT_LIST_HEAD(&fs_devices->alloc_list); |
8a4b83cc CM |
347 | list_add(&fs_devices->list, &fs_uuids); |
348 | memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); | |
349 | fs_devices->latest_devid = devid; | |
350 | fs_devices->latest_trans = found_transid; | |
e5e9a520 | 351 | mutex_init(&fs_devices->device_list_mutex); |
8a4b83cc CM |
352 | device = NULL; |
353 | } else { | |
a443755f CM |
354 | device = __find_device(&fs_devices->devices, devid, |
355 | disk_super->dev_item.uuid); | |
8a4b83cc CM |
356 | } |
357 | if (!device) { | |
2b82032c YZ |
358 | if (fs_devices->opened) |
359 | return -EBUSY; | |
360 | ||
8a4b83cc CM |
361 | device = kzalloc(sizeof(*device), GFP_NOFS); |
362 | if (!device) { | |
363 | /* we can safely leave the fs_devices entry around */ | |
364 | return -ENOMEM; | |
365 | } | |
366 | device->devid = devid; | |
733f4fbb | 367 | device->dev_stats_valid = 0; |
8b712842 | 368 | device->work.func = pending_bios_fn; |
a443755f CM |
369 | memcpy(device->uuid, disk_super->dev_item.uuid, |
370 | BTRFS_UUID_SIZE); | |
b248a415 | 371 | spin_lock_init(&device->io_lock); |
606686ee JB |
372 | |
373 | name = rcu_string_strdup(path, GFP_NOFS); | |
374 | if (!name) { | |
8a4b83cc CM |
375 | kfree(device); |
376 | return -ENOMEM; | |
377 | } | |
606686ee | 378 | rcu_assign_pointer(device->name, name); |
2b82032c | 379 | INIT_LIST_HEAD(&device->dev_alloc_list); |
e5e9a520 | 380 | |
90519d66 AJ |
381 | /* init readahead state */ |
382 | spin_lock_init(&device->reada_lock); | |
383 | device->reada_curr_zone = NULL; | |
384 | atomic_set(&device->reada_in_flight, 0); | |
385 | device->reada_next = 0; | |
386 | INIT_RADIX_TREE(&device->reada_zones, GFP_NOFS & ~__GFP_WAIT); | |
387 | INIT_RADIX_TREE(&device->reada_extents, GFP_NOFS & ~__GFP_WAIT); | |
388 | ||
e5e9a520 | 389 | mutex_lock(&fs_devices->device_list_mutex); |
1f78160c | 390 | list_add_rcu(&device->dev_list, &fs_devices->devices); |
e5e9a520 CM |
391 | mutex_unlock(&fs_devices->device_list_mutex); |
392 | ||
2b82032c | 393 | device->fs_devices = fs_devices; |
8a4b83cc | 394 | fs_devices->num_devices++; |
606686ee JB |
395 | } else if (!device->name || strcmp(device->name->str, path)) { |
396 | name = rcu_string_strdup(path, GFP_NOFS); | |
3a0524dc TH |
397 | if (!name) |
398 | return -ENOMEM; | |
606686ee JB |
399 | rcu_string_free(device->name); |
400 | rcu_assign_pointer(device->name, name); | |
cd02dca5 CM |
401 | if (device->missing) { |
402 | fs_devices->missing_devices--; | |
403 | device->missing = 0; | |
404 | } | |
8a4b83cc CM |
405 | } |
406 | ||
407 | if (found_transid > fs_devices->latest_trans) { | |
408 | fs_devices->latest_devid = devid; | |
409 | fs_devices->latest_trans = found_transid; | |
410 | } | |
8a4b83cc CM |
411 | *fs_devices_ret = fs_devices; |
412 | return 0; | |
413 | } | |
414 | ||
e4404d6e YZ |
415 | static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig) |
416 | { | |
417 | struct btrfs_fs_devices *fs_devices; | |
418 | struct btrfs_device *device; | |
419 | struct btrfs_device *orig_dev; | |
420 | ||
421 | fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); | |
422 | if (!fs_devices) | |
423 | return ERR_PTR(-ENOMEM); | |
424 | ||
425 | INIT_LIST_HEAD(&fs_devices->devices); | |
426 | INIT_LIST_HEAD(&fs_devices->alloc_list); | |
427 | INIT_LIST_HEAD(&fs_devices->list); | |
e5e9a520 | 428 | mutex_init(&fs_devices->device_list_mutex); |
e4404d6e YZ |
429 | fs_devices->latest_devid = orig->latest_devid; |
430 | fs_devices->latest_trans = orig->latest_trans; | |
02db0844 | 431 | fs_devices->total_devices = orig->total_devices; |
e4404d6e YZ |
432 | memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid)); |
433 | ||
46224705 | 434 | /* We have held the volume lock, it is safe to get the devices. */ |
e4404d6e | 435 | list_for_each_entry(orig_dev, &orig->devices, dev_list) { |
606686ee JB |
436 | struct rcu_string *name; |
437 | ||
e4404d6e YZ |
438 | device = kzalloc(sizeof(*device), GFP_NOFS); |
439 | if (!device) | |
440 | goto error; | |
441 | ||
606686ee JB |
442 | /* |
443 | * This is ok to do without rcu read locked because we hold the | |
444 | * uuid mutex so nothing we touch in here is going to disappear. | |
445 | */ | |
446 | name = rcu_string_strdup(orig_dev->name->str, GFP_NOFS); | |
447 | if (!name) { | |
fd2696f3 | 448 | kfree(device); |
e4404d6e | 449 | goto error; |
fd2696f3 | 450 | } |
606686ee | 451 | rcu_assign_pointer(device->name, name); |
e4404d6e YZ |
452 | |
453 | device->devid = orig_dev->devid; | |
454 | device->work.func = pending_bios_fn; | |
455 | memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid)); | |
e4404d6e YZ |
456 | spin_lock_init(&device->io_lock); |
457 | INIT_LIST_HEAD(&device->dev_list); | |
458 | INIT_LIST_HEAD(&device->dev_alloc_list); | |
459 | ||
460 | list_add(&device->dev_list, &fs_devices->devices); | |
461 | device->fs_devices = fs_devices; | |
462 | fs_devices->num_devices++; | |
463 | } | |
464 | return fs_devices; | |
465 | error: | |
466 | free_fs_devices(fs_devices); | |
467 | return ERR_PTR(-ENOMEM); | |
468 | } | |
469 | ||
143bede5 | 470 | void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices) |
dfe25020 | 471 | { |
c6e30871 | 472 | struct btrfs_device *device, *next; |
dfe25020 | 473 | |
a6b0d5c8 CM |
474 | struct block_device *latest_bdev = NULL; |
475 | u64 latest_devid = 0; | |
476 | u64 latest_transid = 0; | |
477 | ||
dfe25020 CM |
478 | mutex_lock(&uuid_mutex); |
479 | again: | |
46224705 | 480 | /* This is the initialized path, it is safe to release the devices. */ |
c6e30871 | 481 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
a6b0d5c8 CM |
482 | if (device->in_fs_metadata) { |
483 | if (!latest_transid || | |
484 | device->generation > latest_transid) { | |
485 | latest_devid = device->devid; | |
486 | latest_transid = device->generation; | |
487 | latest_bdev = device->bdev; | |
488 | } | |
2b82032c | 489 | continue; |
a6b0d5c8 | 490 | } |
2b82032c YZ |
491 | |
492 | if (device->bdev) { | |
d4d77629 | 493 | blkdev_put(device->bdev, device->mode); |
2b82032c YZ |
494 | device->bdev = NULL; |
495 | fs_devices->open_devices--; | |
496 | } | |
497 | if (device->writeable) { | |
498 | list_del_init(&device->dev_alloc_list); | |
499 | device->writeable = 0; | |
500 | fs_devices->rw_devices--; | |
501 | } | |
e4404d6e YZ |
502 | list_del_init(&device->dev_list); |
503 | fs_devices->num_devices--; | |
606686ee | 504 | rcu_string_free(device->name); |
e4404d6e | 505 | kfree(device); |
dfe25020 | 506 | } |
2b82032c YZ |
507 | |
508 | if (fs_devices->seed) { | |
509 | fs_devices = fs_devices->seed; | |
2b82032c YZ |
510 | goto again; |
511 | } | |
512 | ||
a6b0d5c8 CM |
513 | fs_devices->latest_bdev = latest_bdev; |
514 | fs_devices->latest_devid = latest_devid; | |
515 | fs_devices->latest_trans = latest_transid; | |
516 | ||
dfe25020 | 517 | mutex_unlock(&uuid_mutex); |
dfe25020 | 518 | } |
a0af469b | 519 | |
1f78160c XG |
520 | static void __free_device(struct work_struct *work) |
521 | { | |
522 | struct btrfs_device *device; | |
523 | ||
524 | device = container_of(work, struct btrfs_device, rcu_work); | |
525 | ||
526 | if (device->bdev) | |
527 | blkdev_put(device->bdev, device->mode); | |
528 | ||
606686ee | 529 | rcu_string_free(device->name); |
1f78160c XG |
530 | kfree(device); |
531 | } | |
532 | ||
533 | static void free_device(struct rcu_head *head) | |
534 | { | |
535 | struct btrfs_device *device; | |
536 | ||
537 | device = container_of(head, struct btrfs_device, rcu); | |
538 | ||
539 | INIT_WORK(&device->rcu_work, __free_device); | |
540 | schedule_work(&device->rcu_work); | |
541 | } | |
542 | ||
2b82032c | 543 | static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
8a4b83cc | 544 | { |
8a4b83cc | 545 | struct btrfs_device *device; |
e4404d6e | 546 | |
2b82032c YZ |
547 | if (--fs_devices->opened > 0) |
548 | return 0; | |
8a4b83cc | 549 | |
c9513edb | 550 | mutex_lock(&fs_devices->device_list_mutex); |
c6e30871 | 551 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
1f78160c | 552 | struct btrfs_device *new_device; |
606686ee | 553 | struct rcu_string *name; |
1f78160c XG |
554 | |
555 | if (device->bdev) | |
a0af469b | 556 | fs_devices->open_devices--; |
1f78160c | 557 | |
2b82032c YZ |
558 | if (device->writeable) { |
559 | list_del_init(&device->dev_alloc_list); | |
560 | fs_devices->rw_devices--; | |
561 | } | |
562 | ||
d5e2003c JB |
563 | if (device->can_discard) |
564 | fs_devices->num_can_discard--; | |
565 | ||
1f78160c | 566 | new_device = kmalloc(sizeof(*new_device), GFP_NOFS); |
79787eaa | 567 | BUG_ON(!new_device); /* -ENOMEM */ |
1f78160c | 568 | memcpy(new_device, device, sizeof(*new_device)); |
606686ee JB |
569 | |
570 | /* Safe because we are under uuid_mutex */ | |
99f5944b JB |
571 | if (device->name) { |
572 | name = rcu_string_strdup(device->name->str, GFP_NOFS); | |
573 | BUG_ON(device->name && !name); /* -ENOMEM */ | |
574 | rcu_assign_pointer(new_device->name, name); | |
575 | } | |
1f78160c XG |
576 | new_device->bdev = NULL; |
577 | new_device->writeable = 0; | |
578 | new_device->in_fs_metadata = 0; | |
d5e2003c | 579 | new_device->can_discard = 0; |
1f78160c XG |
580 | list_replace_rcu(&device->dev_list, &new_device->dev_list); |
581 | ||
582 | call_rcu(&device->rcu, free_device); | |
8a4b83cc | 583 | } |
c9513edb XG |
584 | mutex_unlock(&fs_devices->device_list_mutex); |
585 | ||
e4404d6e YZ |
586 | WARN_ON(fs_devices->open_devices); |
587 | WARN_ON(fs_devices->rw_devices); | |
2b82032c YZ |
588 | fs_devices->opened = 0; |
589 | fs_devices->seeding = 0; | |
2b82032c | 590 | |
8a4b83cc CM |
591 | return 0; |
592 | } | |
593 | ||
2b82032c YZ |
594 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) |
595 | { | |
e4404d6e | 596 | struct btrfs_fs_devices *seed_devices = NULL; |
2b82032c YZ |
597 | int ret; |
598 | ||
599 | mutex_lock(&uuid_mutex); | |
600 | ret = __btrfs_close_devices(fs_devices); | |
e4404d6e YZ |
601 | if (!fs_devices->opened) { |
602 | seed_devices = fs_devices->seed; | |
603 | fs_devices->seed = NULL; | |
604 | } | |
2b82032c | 605 | mutex_unlock(&uuid_mutex); |
e4404d6e YZ |
606 | |
607 | while (seed_devices) { | |
608 | fs_devices = seed_devices; | |
609 | seed_devices = fs_devices->seed; | |
610 | __btrfs_close_devices(fs_devices); | |
611 | free_fs_devices(fs_devices); | |
612 | } | |
2b82032c YZ |
613 | return ret; |
614 | } | |
615 | ||
e4404d6e YZ |
616 | static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
617 | fmode_t flags, void *holder) | |
8a4b83cc | 618 | { |
d5e2003c | 619 | struct request_queue *q; |
8a4b83cc CM |
620 | struct block_device *bdev; |
621 | struct list_head *head = &fs_devices->devices; | |
8a4b83cc | 622 | struct btrfs_device *device; |
a0af469b CM |
623 | struct block_device *latest_bdev = NULL; |
624 | struct buffer_head *bh; | |
625 | struct btrfs_super_block *disk_super; | |
626 | u64 latest_devid = 0; | |
627 | u64 latest_transid = 0; | |
a0af469b | 628 | u64 devid; |
2b82032c | 629 | int seeding = 1; |
a0af469b | 630 | int ret = 0; |
8a4b83cc | 631 | |
d4d77629 TH |
632 | flags |= FMODE_EXCL; |
633 | ||
c6e30871 | 634 | list_for_each_entry(device, head, dev_list) { |
c1c4d91c CM |
635 | if (device->bdev) |
636 | continue; | |
dfe25020 CM |
637 | if (!device->name) |
638 | continue; | |
639 | ||
606686ee | 640 | bdev = blkdev_get_by_path(device->name->str, flags, holder); |
8a4b83cc | 641 | if (IS_ERR(bdev)) { |
48940662 | 642 | printk(KERN_INFO "btrfs: open %s failed\n", device->name->str); |
a0af469b | 643 | goto error; |
8a4b83cc | 644 | } |
3c4bb26b CM |
645 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
646 | invalidate_bdev(bdev); | |
a061fc8d | 647 | set_blocksize(bdev, 4096); |
a0af469b | 648 | |
a512bbf8 | 649 | bh = btrfs_read_dev_super(bdev); |
20bcd649 | 650 | if (!bh) |
a0af469b CM |
651 | goto error_close; |
652 | ||
653 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 654 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
a0af469b CM |
655 | if (devid != device->devid) |
656 | goto error_brelse; | |
657 | ||
2b82032c YZ |
658 | if (memcmp(device->uuid, disk_super->dev_item.uuid, |
659 | BTRFS_UUID_SIZE)) | |
660 | goto error_brelse; | |
661 | ||
662 | device->generation = btrfs_super_generation(disk_super); | |
663 | if (!latest_transid || device->generation > latest_transid) { | |
a0af469b | 664 | latest_devid = devid; |
2b82032c | 665 | latest_transid = device->generation; |
a0af469b CM |
666 | latest_bdev = bdev; |
667 | } | |
668 | ||
2b82032c YZ |
669 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) { |
670 | device->writeable = 0; | |
671 | } else { | |
672 | device->writeable = !bdev_read_only(bdev); | |
673 | seeding = 0; | |
674 | } | |
675 | ||
d5e2003c JB |
676 | q = bdev_get_queue(bdev); |
677 | if (blk_queue_discard(q)) { | |
678 | device->can_discard = 1; | |
679 | fs_devices->num_can_discard++; | |
680 | } | |
681 | ||
8a4b83cc | 682 | device->bdev = bdev; |
dfe25020 | 683 | device->in_fs_metadata = 0; |
15916de8 CM |
684 | device->mode = flags; |
685 | ||
c289811c CM |
686 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
687 | fs_devices->rotating = 1; | |
688 | ||
a0af469b | 689 | fs_devices->open_devices++; |
2b82032c YZ |
690 | if (device->writeable) { |
691 | fs_devices->rw_devices++; | |
692 | list_add(&device->dev_alloc_list, | |
693 | &fs_devices->alloc_list); | |
694 | } | |
4f6c9328 | 695 | brelse(bh); |
a0af469b | 696 | continue; |
a061fc8d | 697 | |
a0af469b CM |
698 | error_brelse: |
699 | brelse(bh); | |
700 | error_close: | |
d4d77629 | 701 | blkdev_put(bdev, flags); |
a0af469b CM |
702 | error: |
703 | continue; | |
8a4b83cc | 704 | } |
a0af469b | 705 | if (fs_devices->open_devices == 0) { |
20bcd649 | 706 | ret = -EINVAL; |
a0af469b CM |
707 | goto out; |
708 | } | |
2b82032c YZ |
709 | fs_devices->seeding = seeding; |
710 | fs_devices->opened = 1; | |
a0af469b CM |
711 | fs_devices->latest_bdev = latest_bdev; |
712 | fs_devices->latest_devid = latest_devid; | |
713 | fs_devices->latest_trans = latest_transid; | |
2b82032c | 714 | fs_devices->total_rw_bytes = 0; |
a0af469b | 715 | out: |
2b82032c YZ |
716 | return ret; |
717 | } | |
718 | ||
719 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, | |
97288f2c | 720 | fmode_t flags, void *holder) |
2b82032c YZ |
721 | { |
722 | int ret; | |
723 | ||
724 | mutex_lock(&uuid_mutex); | |
725 | if (fs_devices->opened) { | |
e4404d6e YZ |
726 | fs_devices->opened++; |
727 | ret = 0; | |
2b82032c | 728 | } else { |
15916de8 | 729 | ret = __btrfs_open_devices(fs_devices, flags, holder); |
2b82032c | 730 | } |
8a4b83cc | 731 | mutex_unlock(&uuid_mutex); |
8a4b83cc CM |
732 | return ret; |
733 | } | |
734 | ||
97288f2c | 735 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, |
8a4b83cc CM |
736 | struct btrfs_fs_devices **fs_devices_ret) |
737 | { | |
738 | struct btrfs_super_block *disk_super; | |
739 | struct block_device *bdev; | |
740 | struct buffer_head *bh; | |
741 | int ret; | |
742 | u64 devid; | |
f2984462 | 743 | u64 transid; |
02db0844 | 744 | u64 total_devices; |
8a4b83cc | 745 | |
d4d77629 TH |
746 | flags |= FMODE_EXCL; |
747 | bdev = blkdev_get_by_path(path, flags, holder); | |
8a4b83cc CM |
748 | |
749 | if (IS_ERR(bdev)) { | |
8a4b83cc CM |
750 | ret = PTR_ERR(bdev); |
751 | goto error; | |
752 | } | |
753 | ||
10f6327b | 754 | mutex_lock(&uuid_mutex); |
8a4b83cc CM |
755 | ret = set_blocksize(bdev, 4096); |
756 | if (ret) | |
757 | goto error_close; | |
a512bbf8 | 758 | bh = btrfs_read_dev_super(bdev); |
8a4b83cc | 759 | if (!bh) { |
20b45077 | 760 | ret = -EINVAL; |
8a4b83cc CM |
761 | goto error_close; |
762 | } | |
763 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 764 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
f2984462 | 765 | transid = btrfs_super_generation(disk_super); |
02db0844 | 766 | total_devices = btrfs_super_num_devices(disk_super); |
7ae9c09d | 767 | if (disk_super->label[0]) |
d397712b | 768 | printk(KERN_INFO "device label %s ", disk_super->label); |
22b63a29 ID |
769 | else |
770 | printk(KERN_INFO "device fsid %pU ", disk_super->fsid); | |
119e10cf | 771 | printk(KERN_CONT "devid %llu transid %llu %s\n", |
d397712b | 772 | (unsigned long long)devid, (unsigned long long)transid, path); |
8a4b83cc | 773 | ret = device_list_add(path, disk_super, devid, fs_devices_ret); |
02db0844 JB |
774 | if (!ret && fs_devices_ret) |
775 | (*fs_devices_ret)->total_devices = total_devices; | |
8a4b83cc CM |
776 | brelse(bh); |
777 | error_close: | |
10f6327b | 778 | mutex_unlock(&uuid_mutex); |
d4d77629 | 779 | blkdev_put(bdev, flags); |
8a4b83cc | 780 | error: |
8a4b83cc CM |
781 | return ret; |
782 | } | |
0b86a832 | 783 | |
6d07bcec MX |
784 | /* helper to account the used device space in the range */ |
785 | int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, | |
786 | u64 end, u64 *length) | |
787 | { | |
788 | struct btrfs_key key; | |
789 | struct btrfs_root *root = device->dev_root; | |
790 | struct btrfs_dev_extent *dev_extent; | |
791 | struct btrfs_path *path; | |
792 | u64 extent_end; | |
793 | int ret; | |
794 | int slot; | |
795 | struct extent_buffer *l; | |
796 | ||
797 | *length = 0; | |
798 | ||
799 | if (start >= device->total_bytes) | |
800 | return 0; | |
801 | ||
802 | path = btrfs_alloc_path(); | |
803 | if (!path) | |
804 | return -ENOMEM; | |
805 | path->reada = 2; | |
806 | ||
807 | key.objectid = device->devid; | |
808 | key.offset = start; | |
809 | key.type = BTRFS_DEV_EXTENT_KEY; | |
810 | ||
811 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
812 | if (ret < 0) | |
813 | goto out; | |
814 | if (ret > 0) { | |
815 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
816 | if (ret < 0) | |
817 | goto out; | |
818 | } | |
819 | ||
820 | while (1) { | |
821 | l = path->nodes[0]; | |
822 | slot = path->slots[0]; | |
823 | if (slot >= btrfs_header_nritems(l)) { | |
824 | ret = btrfs_next_leaf(root, path); | |
825 | if (ret == 0) | |
826 | continue; | |
827 | if (ret < 0) | |
828 | goto out; | |
829 | ||
830 | break; | |
831 | } | |
832 | btrfs_item_key_to_cpu(l, &key, slot); | |
833 | ||
834 | if (key.objectid < device->devid) | |
835 | goto next; | |
836 | ||
837 | if (key.objectid > device->devid) | |
838 | break; | |
839 | ||
840 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) | |
841 | goto next; | |
842 | ||
843 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
844 | extent_end = key.offset + btrfs_dev_extent_length(l, | |
845 | dev_extent); | |
846 | if (key.offset <= start && extent_end > end) { | |
847 | *length = end - start + 1; | |
848 | break; | |
849 | } else if (key.offset <= start && extent_end > start) | |
850 | *length += extent_end - start; | |
851 | else if (key.offset > start && extent_end <= end) | |
852 | *length += extent_end - key.offset; | |
853 | else if (key.offset > start && key.offset <= end) { | |
854 | *length += end - key.offset + 1; | |
855 | break; | |
856 | } else if (key.offset > end) | |
857 | break; | |
858 | ||
859 | next: | |
860 | path->slots[0]++; | |
861 | } | |
862 | ret = 0; | |
863 | out: | |
864 | btrfs_free_path(path); | |
865 | return ret; | |
866 | } | |
867 | ||
0b86a832 | 868 | /* |
7bfc837d | 869 | * find_free_dev_extent - find free space in the specified device |
7bfc837d MX |
870 | * @device: the device which we search the free space in |
871 | * @num_bytes: the size of the free space that we need | |
872 | * @start: store the start of the free space. | |
873 | * @len: the size of the free space. that we find, or the size of the max | |
874 | * free space if we don't find suitable free space | |
875 | * | |
0b86a832 CM |
876 | * this uses a pretty simple search, the expectation is that it is |
877 | * called very infrequently and that a given device has a small number | |
878 | * of extents | |
7bfc837d MX |
879 | * |
880 | * @start is used to store the start of the free space if we find. But if we | |
881 | * don't find suitable free space, it will be used to store the start position | |
882 | * of the max free space. | |
883 | * | |
884 | * @len is used to store the size of the free space that we find. | |
885 | * But if we don't find suitable free space, it is used to store the size of | |
886 | * the max free space. | |
0b86a832 | 887 | */ |
125ccb0a | 888 | int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, |
7bfc837d | 889 | u64 *start, u64 *len) |
0b86a832 CM |
890 | { |
891 | struct btrfs_key key; | |
892 | struct btrfs_root *root = device->dev_root; | |
7bfc837d | 893 | struct btrfs_dev_extent *dev_extent; |
2b82032c | 894 | struct btrfs_path *path; |
7bfc837d MX |
895 | u64 hole_size; |
896 | u64 max_hole_start; | |
897 | u64 max_hole_size; | |
898 | u64 extent_end; | |
899 | u64 search_start; | |
0b86a832 CM |
900 | u64 search_end = device->total_bytes; |
901 | int ret; | |
7bfc837d | 902 | int slot; |
0b86a832 CM |
903 | struct extent_buffer *l; |
904 | ||
0b86a832 CM |
905 | /* FIXME use last free of some kind */ |
906 | ||
8a4b83cc CM |
907 | /* we don't want to overwrite the superblock on the drive, |
908 | * so we make sure to start at an offset of at least 1MB | |
909 | */ | |
a9c9bf68 | 910 | search_start = max(root->fs_info->alloc_start, 1024ull * 1024); |
8f18cf13 | 911 | |
7bfc837d MX |
912 | max_hole_start = search_start; |
913 | max_hole_size = 0; | |
38c01b96 | 914 | hole_size = 0; |
7bfc837d MX |
915 | |
916 | if (search_start >= search_end) { | |
917 | ret = -ENOSPC; | |
918 | goto error; | |
919 | } | |
920 | ||
921 | path = btrfs_alloc_path(); | |
922 | if (!path) { | |
923 | ret = -ENOMEM; | |
924 | goto error; | |
925 | } | |
926 | path->reada = 2; | |
927 | ||
0b86a832 CM |
928 | key.objectid = device->devid; |
929 | key.offset = search_start; | |
930 | key.type = BTRFS_DEV_EXTENT_KEY; | |
7bfc837d | 931 | |
125ccb0a | 932 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
0b86a832 | 933 | if (ret < 0) |
7bfc837d | 934 | goto out; |
1fcbac58 YZ |
935 | if (ret > 0) { |
936 | ret = btrfs_previous_item(root, path, key.objectid, key.type); | |
937 | if (ret < 0) | |
7bfc837d | 938 | goto out; |
1fcbac58 | 939 | } |
7bfc837d | 940 | |
0b86a832 CM |
941 | while (1) { |
942 | l = path->nodes[0]; | |
943 | slot = path->slots[0]; | |
944 | if (slot >= btrfs_header_nritems(l)) { | |
945 | ret = btrfs_next_leaf(root, path); | |
946 | if (ret == 0) | |
947 | continue; | |
948 | if (ret < 0) | |
7bfc837d MX |
949 | goto out; |
950 | ||
951 | break; | |
0b86a832 CM |
952 | } |
953 | btrfs_item_key_to_cpu(l, &key, slot); | |
954 | ||
955 | if (key.objectid < device->devid) | |
956 | goto next; | |
957 | ||
958 | if (key.objectid > device->devid) | |
7bfc837d | 959 | break; |
0b86a832 | 960 | |
7bfc837d MX |
961 | if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) |
962 | goto next; | |
9779b72f | 963 | |
7bfc837d MX |
964 | if (key.offset > search_start) { |
965 | hole_size = key.offset - search_start; | |
9779b72f | 966 | |
7bfc837d MX |
967 | if (hole_size > max_hole_size) { |
968 | max_hole_start = search_start; | |
969 | max_hole_size = hole_size; | |
970 | } | |
9779b72f | 971 | |
7bfc837d MX |
972 | /* |
973 | * If this free space is greater than which we need, | |
974 | * it must be the max free space that we have found | |
975 | * until now, so max_hole_start must point to the start | |
976 | * of this free space and the length of this free space | |
977 | * is stored in max_hole_size. Thus, we return | |
978 | * max_hole_start and max_hole_size and go back to the | |
979 | * caller. | |
980 | */ | |
981 | if (hole_size >= num_bytes) { | |
982 | ret = 0; | |
983 | goto out; | |
0b86a832 CM |
984 | } |
985 | } | |
0b86a832 | 986 | |
0b86a832 | 987 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
7bfc837d MX |
988 | extent_end = key.offset + btrfs_dev_extent_length(l, |
989 | dev_extent); | |
990 | if (extent_end > search_start) | |
991 | search_start = extent_end; | |
0b86a832 CM |
992 | next: |
993 | path->slots[0]++; | |
994 | cond_resched(); | |
995 | } | |
0b86a832 | 996 | |
38c01b96 | 997 | /* |
998 | * At this point, search_start should be the end of | |
999 | * allocated dev extents, and when shrinking the device, | |
1000 | * search_end may be smaller than search_start. | |
1001 | */ | |
1002 | if (search_end > search_start) | |
1003 | hole_size = search_end - search_start; | |
1004 | ||
7bfc837d MX |
1005 | if (hole_size > max_hole_size) { |
1006 | max_hole_start = search_start; | |
1007 | max_hole_size = hole_size; | |
0b86a832 | 1008 | } |
0b86a832 | 1009 | |
7bfc837d MX |
1010 | /* See above. */ |
1011 | if (hole_size < num_bytes) | |
1012 | ret = -ENOSPC; | |
1013 | else | |
1014 | ret = 0; | |
1015 | ||
1016 | out: | |
2b82032c | 1017 | btrfs_free_path(path); |
7bfc837d MX |
1018 | error: |
1019 | *start = max_hole_start; | |
b2117a39 | 1020 | if (len) |
7bfc837d | 1021 | *len = max_hole_size; |
0b86a832 CM |
1022 | return ret; |
1023 | } | |
1024 | ||
b2950863 | 1025 | static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
1026 | struct btrfs_device *device, |
1027 | u64 start) | |
1028 | { | |
1029 | int ret; | |
1030 | struct btrfs_path *path; | |
1031 | struct btrfs_root *root = device->dev_root; | |
1032 | struct btrfs_key key; | |
a061fc8d CM |
1033 | struct btrfs_key found_key; |
1034 | struct extent_buffer *leaf = NULL; | |
1035 | struct btrfs_dev_extent *extent = NULL; | |
8f18cf13 CM |
1036 | |
1037 | path = btrfs_alloc_path(); | |
1038 | if (!path) | |
1039 | return -ENOMEM; | |
1040 | ||
1041 | key.objectid = device->devid; | |
1042 | key.offset = start; | |
1043 | key.type = BTRFS_DEV_EXTENT_KEY; | |
924cd8fb | 1044 | again: |
8f18cf13 | 1045 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
a061fc8d CM |
1046 | if (ret > 0) { |
1047 | ret = btrfs_previous_item(root, path, key.objectid, | |
1048 | BTRFS_DEV_EXTENT_KEY); | |
b0b802d7 TI |
1049 | if (ret) |
1050 | goto out; | |
a061fc8d CM |
1051 | leaf = path->nodes[0]; |
1052 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1053 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1054 | struct btrfs_dev_extent); | |
1055 | BUG_ON(found_key.offset > start || found_key.offset + | |
1056 | btrfs_dev_extent_length(leaf, extent) < start); | |
924cd8fb MX |
1057 | key = found_key; |
1058 | btrfs_release_path(path); | |
1059 | goto again; | |
a061fc8d CM |
1060 | } else if (ret == 0) { |
1061 | leaf = path->nodes[0]; | |
1062 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1063 | struct btrfs_dev_extent); | |
79787eaa JM |
1064 | } else { |
1065 | btrfs_error(root->fs_info, ret, "Slot search failed"); | |
1066 | goto out; | |
a061fc8d | 1067 | } |
8f18cf13 | 1068 | |
2bf64758 JB |
1069 | if (device->bytes_used > 0) { |
1070 | u64 len = btrfs_dev_extent_length(leaf, extent); | |
1071 | device->bytes_used -= len; | |
1072 | spin_lock(&root->fs_info->free_chunk_lock); | |
1073 | root->fs_info->free_chunk_space += len; | |
1074 | spin_unlock(&root->fs_info->free_chunk_lock); | |
1075 | } | |
8f18cf13 | 1076 | ret = btrfs_del_item(trans, root, path); |
79787eaa JM |
1077 | if (ret) { |
1078 | btrfs_error(root->fs_info, ret, | |
1079 | "Failed to remove dev extent item"); | |
1080 | } | |
b0b802d7 | 1081 | out: |
8f18cf13 CM |
1082 | btrfs_free_path(path); |
1083 | return ret; | |
1084 | } | |
1085 | ||
2b82032c | 1086 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
0b86a832 | 1087 | struct btrfs_device *device, |
e17cade2 | 1088 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 1089 | u64 chunk_offset, u64 start, u64 num_bytes) |
0b86a832 CM |
1090 | { |
1091 | int ret; | |
1092 | struct btrfs_path *path; | |
1093 | struct btrfs_root *root = device->dev_root; | |
1094 | struct btrfs_dev_extent *extent; | |
1095 | struct extent_buffer *leaf; | |
1096 | struct btrfs_key key; | |
1097 | ||
dfe25020 | 1098 | WARN_ON(!device->in_fs_metadata); |
0b86a832 CM |
1099 | path = btrfs_alloc_path(); |
1100 | if (!path) | |
1101 | return -ENOMEM; | |
1102 | ||
0b86a832 | 1103 | key.objectid = device->devid; |
2b82032c | 1104 | key.offset = start; |
0b86a832 CM |
1105 | key.type = BTRFS_DEV_EXTENT_KEY; |
1106 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1107 | sizeof(*extent)); | |
2cdcecbc MF |
1108 | if (ret) |
1109 | goto out; | |
0b86a832 CM |
1110 | |
1111 | leaf = path->nodes[0]; | |
1112 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
1113 | struct btrfs_dev_extent); | |
e17cade2 CM |
1114 | btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree); |
1115 | btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid); | |
1116 | btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); | |
1117 | ||
1118 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, | |
1119 | (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), | |
1120 | BTRFS_UUID_SIZE); | |
1121 | ||
0b86a832 CM |
1122 | btrfs_set_dev_extent_length(leaf, extent, num_bytes); |
1123 | btrfs_mark_buffer_dirty(leaf); | |
2cdcecbc | 1124 | out: |
0b86a832 CM |
1125 | btrfs_free_path(path); |
1126 | return ret; | |
1127 | } | |
1128 | ||
a1b32a59 CM |
1129 | static noinline int find_next_chunk(struct btrfs_root *root, |
1130 | u64 objectid, u64 *offset) | |
0b86a832 CM |
1131 | { |
1132 | struct btrfs_path *path; | |
1133 | int ret; | |
1134 | struct btrfs_key key; | |
e17cade2 | 1135 | struct btrfs_chunk *chunk; |
0b86a832 CM |
1136 | struct btrfs_key found_key; |
1137 | ||
1138 | path = btrfs_alloc_path(); | |
92b8e897 MF |
1139 | if (!path) |
1140 | return -ENOMEM; | |
0b86a832 | 1141 | |
e17cade2 | 1142 | key.objectid = objectid; |
0b86a832 CM |
1143 | key.offset = (u64)-1; |
1144 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1145 | ||
1146 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1147 | if (ret < 0) | |
1148 | goto error; | |
1149 | ||
79787eaa | 1150 | BUG_ON(ret == 0); /* Corruption */ |
0b86a832 CM |
1151 | |
1152 | ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY); | |
1153 | if (ret) { | |
e17cade2 | 1154 | *offset = 0; |
0b86a832 CM |
1155 | } else { |
1156 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1157 | path->slots[0]); | |
e17cade2 CM |
1158 | if (found_key.objectid != objectid) |
1159 | *offset = 0; | |
1160 | else { | |
1161 | chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1162 | struct btrfs_chunk); | |
1163 | *offset = found_key.offset + | |
1164 | btrfs_chunk_length(path->nodes[0], chunk); | |
1165 | } | |
0b86a832 CM |
1166 | } |
1167 | ret = 0; | |
1168 | error: | |
1169 | btrfs_free_path(path); | |
1170 | return ret; | |
1171 | } | |
1172 | ||
2b82032c | 1173 | static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid) |
0b86a832 CM |
1174 | { |
1175 | int ret; | |
1176 | struct btrfs_key key; | |
1177 | struct btrfs_key found_key; | |
2b82032c YZ |
1178 | struct btrfs_path *path; |
1179 | ||
1180 | root = root->fs_info->chunk_root; | |
1181 | ||
1182 | path = btrfs_alloc_path(); | |
1183 | if (!path) | |
1184 | return -ENOMEM; | |
0b86a832 CM |
1185 | |
1186 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1187 | key.type = BTRFS_DEV_ITEM_KEY; | |
1188 | key.offset = (u64)-1; | |
1189 | ||
1190 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1191 | if (ret < 0) | |
1192 | goto error; | |
1193 | ||
79787eaa | 1194 | BUG_ON(ret == 0); /* Corruption */ |
0b86a832 CM |
1195 | |
1196 | ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID, | |
1197 | BTRFS_DEV_ITEM_KEY); | |
1198 | if (ret) { | |
1199 | *objectid = 1; | |
1200 | } else { | |
1201 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1202 | path->slots[0]); | |
1203 | *objectid = found_key.offset + 1; | |
1204 | } | |
1205 | ret = 0; | |
1206 | error: | |
2b82032c | 1207 | btrfs_free_path(path); |
0b86a832 CM |
1208 | return ret; |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * the device information is stored in the chunk root | |
1213 | * the btrfs_device struct should be fully filled in | |
1214 | */ | |
1215 | int btrfs_add_device(struct btrfs_trans_handle *trans, | |
1216 | struct btrfs_root *root, | |
1217 | struct btrfs_device *device) | |
1218 | { | |
1219 | int ret; | |
1220 | struct btrfs_path *path; | |
1221 | struct btrfs_dev_item *dev_item; | |
1222 | struct extent_buffer *leaf; | |
1223 | struct btrfs_key key; | |
1224 | unsigned long ptr; | |
0b86a832 CM |
1225 | |
1226 | root = root->fs_info->chunk_root; | |
1227 | ||
1228 | path = btrfs_alloc_path(); | |
1229 | if (!path) | |
1230 | return -ENOMEM; | |
1231 | ||
0b86a832 CM |
1232 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1233 | key.type = BTRFS_DEV_ITEM_KEY; | |
2b82032c | 1234 | key.offset = device->devid; |
0b86a832 CM |
1235 | |
1236 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
0d81ba5d | 1237 | sizeof(*dev_item)); |
0b86a832 CM |
1238 | if (ret) |
1239 | goto out; | |
1240 | ||
1241 | leaf = path->nodes[0]; | |
1242 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1243 | ||
1244 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
2b82032c | 1245 | btrfs_set_device_generation(leaf, dev_item, 0); |
0b86a832 CM |
1246 | btrfs_set_device_type(leaf, dev_item, device->type); |
1247 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1248 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1249 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
0b86a832 CM |
1250 | btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); |
1251 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); | |
e17cade2 CM |
1252 | btrfs_set_device_group(leaf, dev_item, 0); |
1253 | btrfs_set_device_seek_speed(leaf, dev_item, 0); | |
1254 | btrfs_set_device_bandwidth(leaf, dev_item, 0); | |
c3027eb5 | 1255 | btrfs_set_device_start_offset(leaf, dev_item, 0); |
0b86a832 | 1256 | |
0b86a832 | 1257 | ptr = (unsigned long)btrfs_device_uuid(dev_item); |
e17cade2 | 1258 | write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
2b82032c YZ |
1259 | ptr = (unsigned long)btrfs_device_fsid(dev_item); |
1260 | write_extent_buffer(leaf, root->fs_info->fsid, ptr, BTRFS_UUID_SIZE); | |
0b86a832 | 1261 | btrfs_mark_buffer_dirty(leaf); |
0b86a832 | 1262 | |
2b82032c | 1263 | ret = 0; |
0b86a832 CM |
1264 | out: |
1265 | btrfs_free_path(path); | |
1266 | return ret; | |
1267 | } | |
8f18cf13 | 1268 | |
a061fc8d CM |
1269 | static int btrfs_rm_dev_item(struct btrfs_root *root, |
1270 | struct btrfs_device *device) | |
1271 | { | |
1272 | int ret; | |
1273 | struct btrfs_path *path; | |
a061fc8d | 1274 | struct btrfs_key key; |
a061fc8d CM |
1275 | struct btrfs_trans_handle *trans; |
1276 | ||
1277 | root = root->fs_info->chunk_root; | |
1278 | ||
1279 | path = btrfs_alloc_path(); | |
1280 | if (!path) | |
1281 | return -ENOMEM; | |
1282 | ||
a22285a6 | 1283 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1284 | if (IS_ERR(trans)) { |
1285 | btrfs_free_path(path); | |
1286 | return PTR_ERR(trans); | |
1287 | } | |
a061fc8d CM |
1288 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; |
1289 | key.type = BTRFS_DEV_ITEM_KEY; | |
1290 | key.offset = device->devid; | |
7d9eb12c | 1291 | lock_chunks(root); |
a061fc8d CM |
1292 | |
1293 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1294 | if (ret < 0) | |
1295 | goto out; | |
1296 | ||
1297 | if (ret > 0) { | |
1298 | ret = -ENOENT; | |
1299 | goto out; | |
1300 | } | |
1301 | ||
1302 | ret = btrfs_del_item(trans, root, path); | |
1303 | if (ret) | |
1304 | goto out; | |
a061fc8d CM |
1305 | out: |
1306 | btrfs_free_path(path); | |
7d9eb12c | 1307 | unlock_chunks(root); |
a061fc8d CM |
1308 | btrfs_commit_transaction(trans, root); |
1309 | return ret; | |
1310 | } | |
1311 | ||
1312 | int btrfs_rm_device(struct btrfs_root *root, char *device_path) | |
1313 | { | |
1314 | struct btrfs_device *device; | |
2b82032c | 1315 | struct btrfs_device *next_device; |
a061fc8d | 1316 | struct block_device *bdev; |
dfe25020 | 1317 | struct buffer_head *bh = NULL; |
a061fc8d | 1318 | struct btrfs_super_block *disk_super; |
1f78160c | 1319 | struct btrfs_fs_devices *cur_devices; |
a061fc8d CM |
1320 | u64 all_avail; |
1321 | u64 devid; | |
2b82032c YZ |
1322 | u64 num_devices; |
1323 | u8 *dev_uuid; | |
a061fc8d | 1324 | int ret = 0; |
1f78160c | 1325 | bool clear_super = false; |
a061fc8d | 1326 | |
a061fc8d CM |
1327 | mutex_lock(&uuid_mutex); |
1328 | ||
1329 | all_avail = root->fs_info->avail_data_alloc_bits | | |
1330 | root->fs_info->avail_system_alloc_bits | | |
1331 | root->fs_info->avail_metadata_alloc_bits; | |
1332 | ||
1333 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && | |
035fe03a | 1334 | root->fs_info->fs_devices->num_devices <= 4) { |
d397712b CM |
1335 | printk(KERN_ERR "btrfs: unable to go below four devices " |
1336 | "on raid10\n"); | |
a061fc8d CM |
1337 | ret = -EINVAL; |
1338 | goto out; | |
1339 | } | |
1340 | ||
1341 | if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && | |
035fe03a | 1342 | root->fs_info->fs_devices->num_devices <= 2) { |
d397712b CM |
1343 | printk(KERN_ERR "btrfs: unable to go below two " |
1344 | "devices on raid1\n"); | |
a061fc8d CM |
1345 | ret = -EINVAL; |
1346 | goto out; | |
1347 | } | |
1348 | ||
dfe25020 | 1349 | if (strcmp(device_path, "missing") == 0) { |
dfe25020 CM |
1350 | struct list_head *devices; |
1351 | struct btrfs_device *tmp; | |
a061fc8d | 1352 | |
dfe25020 CM |
1353 | device = NULL; |
1354 | devices = &root->fs_info->fs_devices->devices; | |
46224705 XG |
1355 | /* |
1356 | * It is safe to read the devices since the volume_mutex | |
1357 | * is held. | |
1358 | */ | |
c6e30871 | 1359 | list_for_each_entry(tmp, devices, dev_list) { |
dfe25020 CM |
1360 | if (tmp->in_fs_metadata && !tmp->bdev) { |
1361 | device = tmp; | |
1362 | break; | |
1363 | } | |
1364 | } | |
1365 | bdev = NULL; | |
1366 | bh = NULL; | |
1367 | disk_super = NULL; | |
1368 | if (!device) { | |
d397712b CM |
1369 | printk(KERN_ERR "btrfs: no missing devices found to " |
1370 | "remove\n"); | |
dfe25020 CM |
1371 | goto out; |
1372 | } | |
dfe25020 | 1373 | } else { |
d4d77629 TH |
1374 | bdev = blkdev_get_by_path(device_path, FMODE_READ | FMODE_EXCL, |
1375 | root->fs_info->bdev_holder); | |
dfe25020 CM |
1376 | if (IS_ERR(bdev)) { |
1377 | ret = PTR_ERR(bdev); | |
1378 | goto out; | |
1379 | } | |
a061fc8d | 1380 | |
2b82032c | 1381 | set_blocksize(bdev, 4096); |
3c4bb26b | 1382 | invalidate_bdev(bdev); |
a512bbf8 | 1383 | bh = btrfs_read_dev_super(bdev); |
dfe25020 | 1384 | if (!bh) { |
20b45077 | 1385 | ret = -EINVAL; |
dfe25020 CM |
1386 | goto error_close; |
1387 | } | |
1388 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
a343832f | 1389 | devid = btrfs_stack_device_id(&disk_super->dev_item); |
2b82032c YZ |
1390 | dev_uuid = disk_super->dev_item.uuid; |
1391 | device = btrfs_find_device(root, devid, dev_uuid, | |
1392 | disk_super->fsid); | |
dfe25020 CM |
1393 | if (!device) { |
1394 | ret = -ENOENT; | |
1395 | goto error_brelse; | |
1396 | } | |
2b82032c | 1397 | } |
dfe25020 | 1398 | |
2b82032c | 1399 | if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) { |
d397712b CM |
1400 | printk(KERN_ERR "btrfs: unable to remove the only writeable " |
1401 | "device\n"); | |
2b82032c YZ |
1402 | ret = -EINVAL; |
1403 | goto error_brelse; | |
1404 | } | |
1405 | ||
1406 | if (device->writeable) { | |
0c1daee0 | 1407 | lock_chunks(root); |
2b82032c | 1408 | list_del_init(&device->dev_alloc_list); |
0c1daee0 | 1409 | unlock_chunks(root); |
2b82032c | 1410 | root->fs_info->fs_devices->rw_devices--; |
1f78160c | 1411 | clear_super = true; |
dfe25020 | 1412 | } |
a061fc8d CM |
1413 | |
1414 | ret = btrfs_shrink_device(device, 0); | |
1415 | if (ret) | |
9b3517e9 | 1416 | goto error_undo; |
a061fc8d | 1417 | |
a061fc8d CM |
1418 | ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device); |
1419 | if (ret) | |
9b3517e9 | 1420 | goto error_undo; |
a061fc8d | 1421 | |
2bf64758 JB |
1422 | spin_lock(&root->fs_info->free_chunk_lock); |
1423 | root->fs_info->free_chunk_space = device->total_bytes - | |
1424 | device->bytes_used; | |
1425 | spin_unlock(&root->fs_info->free_chunk_lock); | |
1426 | ||
2b82032c | 1427 | device->in_fs_metadata = 0; |
a2de733c | 1428 | btrfs_scrub_cancel_dev(root, device); |
e5e9a520 CM |
1429 | |
1430 | /* | |
1431 | * the device list mutex makes sure that we don't change | |
1432 | * the device list while someone else is writing out all | |
1433 | * the device supers. | |
1434 | */ | |
1f78160c XG |
1435 | |
1436 | cur_devices = device->fs_devices; | |
e5e9a520 | 1437 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
1f78160c | 1438 | list_del_rcu(&device->dev_list); |
e5e9a520 | 1439 | |
e4404d6e | 1440 | device->fs_devices->num_devices--; |
02db0844 | 1441 | device->fs_devices->total_devices--; |
2b82032c | 1442 | |
cd02dca5 CM |
1443 | if (device->missing) |
1444 | root->fs_info->fs_devices->missing_devices--; | |
1445 | ||
2b82032c YZ |
1446 | next_device = list_entry(root->fs_info->fs_devices->devices.next, |
1447 | struct btrfs_device, dev_list); | |
1448 | if (device->bdev == root->fs_info->sb->s_bdev) | |
1449 | root->fs_info->sb->s_bdev = next_device->bdev; | |
1450 | if (device->bdev == root->fs_info->fs_devices->latest_bdev) | |
1451 | root->fs_info->fs_devices->latest_bdev = next_device->bdev; | |
1452 | ||
1f78160c | 1453 | if (device->bdev) |
e4404d6e | 1454 | device->fs_devices->open_devices--; |
1f78160c XG |
1455 | |
1456 | call_rcu(&device->rcu, free_device); | |
1457 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
e4404d6e | 1458 | |
6c41761f DS |
1459 | num_devices = btrfs_super_num_devices(root->fs_info->super_copy) - 1; |
1460 | btrfs_set_super_num_devices(root->fs_info->super_copy, num_devices); | |
2b82032c | 1461 | |
1f78160c | 1462 | if (cur_devices->open_devices == 0) { |
e4404d6e YZ |
1463 | struct btrfs_fs_devices *fs_devices; |
1464 | fs_devices = root->fs_info->fs_devices; | |
1465 | while (fs_devices) { | |
1f78160c | 1466 | if (fs_devices->seed == cur_devices) |
e4404d6e YZ |
1467 | break; |
1468 | fs_devices = fs_devices->seed; | |
2b82032c | 1469 | } |
1f78160c XG |
1470 | fs_devices->seed = cur_devices->seed; |
1471 | cur_devices->seed = NULL; | |
0c1daee0 | 1472 | lock_chunks(root); |
1f78160c | 1473 | __btrfs_close_devices(cur_devices); |
0c1daee0 | 1474 | unlock_chunks(root); |
1f78160c | 1475 | free_fs_devices(cur_devices); |
2b82032c YZ |
1476 | } |
1477 | ||
1478 | /* | |
1479 | * at this point, the device is zero sized. We want to | |
1480 | * remove it from the devices list and zero out the old super | |
1481 | */ | |
1f78160c | 1482 | if (clear_super) { |
dfe25020 CM |
1483 | /* make sure this device isn't detected as part of |
1484 | * the FS anymore | |
1485 | */ | |
1486 | memset(&disk_super->magic, 0, sizeof(disk_super->magic)); | |
1487 | set_buffer_dirty(bh); | |
1488 | sync_dirty_buffer(bh); | |
dfe25020 | 1489 | } |
a061fc8d | 1490 | |
a061fc8d | 1491 | ret = 0; |
a061fc8d CM |
1492 | |
1493 | error_brelse: | |
1494 | brelse(bh); | |
1495 | error_close: | |
dfe25020 | 1496 | if (bdev) |
e525fd89 | 1497 | blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
a061fc8d CM |
1498 | out: |
1499 | mutex_unlock(&uuid_mutex); | |
a061fc8d | 1500 | return ret; |
9b3517e9 ID |
1501 | error_undo: |
1502 | if (device->writeable) { | |
0c1daee0 | 1503 | lock_chunks(root); |
9b3517e9 ID |
1504 | list_add(&device->dev_alloc_list, |
1505 | &root->fs_info->fs_devices->alloc_list); | |
0c1daee0 | 1506 | unlock_chunks(root); |
9b3517e9 ID |
1507 | root->fs_info->fs_devices->rw_devices++; |
1508 | } | |
1509 | goto error_brelse; | |
a061fc8d CM |
1510 | } |
1511 | ||
2b82032c YZ |
1512 | /* |
1513 | * does all the dirty work required for changing file system's UUID. | |
1514 | */ | |
125ccb0a | 1515 | static int btrfs_prepare_sprout(struct btrfs_root *root) |
2b82032c YZ |
1516 | { |
1517 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
1518 | struct btrfs_fs_devices *old_devices; | |
e4404d6e | 1519 | struct btrfs_fs_devices *seed_devices; |
6c41761f | 1520 | struct btrfs_super_block *disk_super = root->fs_info->super_copy; |
2b82032c YZ |
1521 | struct btrfs_device *device; |
1522 | u64 super_flags; | |
1523 | ||
1524 | BUG_ON(!mutex_is_locked(&uuid_mutex)); | |
e4404d6e | 1525 | if (!fs_devices->seeding) |
2b82032c YZ |
1526 | return -EINVAL; |
1527 | ||
e4404d6e YZ |
1528 | seed_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); |
1529 | if (!seed_devices) | |
2b82032c YZ |
1530 | return -ENOMEM; |
1531 | ||
e4404d6e YZ |
1532 | old_devices = clone_fs_devices(fs_devices); |
1533 | if (IS_ERR(old_devices)) { | |
1534 | kfree(seed_devices); | |
1535 | return PTR_ERR(old_devices); | |
2b82032c | 1536 | } |
e4404d6e | 1537 | |
2b82032c YZ |
1538 | list_add(&old_devices->list, &fs_uuids); |
1539 | ||
e4404d6e YZ |
1540 | memcpy(seed_devices, fs_devices, sizeof(*seed_devices)); |
1541 | seed_devices->opened = 1; | |
1542 | INIT_LIST_HEAD(&seed_devices->devices); | |
1543 | INIT_LIST_HEAD(&seed_devices->alloc_list); | |
e5e9a520 | 1544 | mutex_init(&seed_devices->device_list_mutex); |
c9513edb XG |
1545 | |
1546 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
1f78160c XG |
1547 | list_splice_init_rcu(&fs_devices->devices, &seed_devices->devices, |
1548 | synchronize_rcu); | |
c9513edb XG |
1549 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
1550 | ||
e4404d6e YZ |
1551 | list_splice_init(&fs_devices->alloc_list, &seed_devices->alloc_list); |
1552 | list_for_each_entry(device, &seed_devices->devices, dev_list) { | |
1553 | device->fs_devices = seed_devices; | |
1554 | } | |
1555 | ||
2b82032c YZ |
1556 | fs_devices->seeding = 0; |
1557 | fs_devices->num_devices = 0; | |
1558 | fs_devices->open_devices = 0; | |
02db0844 | 1559 | fs_devices->total_devices = 0; |
e4404d6e | 1560 | fs_devices->seed = seed_devices; |
2b82032c YZ |
1561 | |
1562 | generate_random_uuid(fs_devices->fsid); | |
1563 | memcpy(root->fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1564 | memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE); | |
1565 | super_flags = btrfs_super_flags(disk_super) & | |
1566 | ~BTRFS_SUPER_FLAG_SEEDING; | |
1567 | btrfs_set_super_flags(disk_super, super_flags); | |
1568 | ||
1569 | return 0; | |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * strore the expected generation for seed devices in device items. | |
1574 | */ | |
1575 | static int btrfs_finish_sprout(struct btrfs_trans_handle *trans, | |
1576 | struct btrfs_root *root) | |
1577 | { | |
1578 | struct btrfs_path *path; | |
1579 | struct extent_buffer *leaf; | |
1580 | struct btrfs_dev_item *dev_item; | |
1581 | struct btrfs_device *device; | |
1582 | struct btrfs_key key; | |
1583 | u8 fs_uuid[BTRFS_UUID_SIZE]; | |
1584 | u8 dev_uuid[BTRFS_UUID_SIZE]; | |
1585 | u64 devid; | |
1586 | int ret; | |
1587 | ||
1588 | path = btrfs_alloc_path(); | |
1589 | if (!path) | |
1590 | return -ENOMEM; | |
1591 | ||
1592 | root = root->fs_info->chunk_root; | |
1593 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1594 | key.offset = 0; | |
1595 | key.type = BTRFS_DEV_ITEM_KEY; | |
1596 | ||
1597 | while (1) { | |
1598 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1599 | if (ret < 0) | |
1600 | goto error; | |
1601 | ||
1602 | leaf = path->nodes[0]; | |
1603 | next_slot: | |
1604 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1605 | ret = btrfs_next_leaf(root, path); | |
1606 | if (ret > 0) | |
1607 | break; | |
1608 | if (ret < 0) | |
1609 | goto error; | |
1610 | leaf = path->nodes[0]; | |
1611 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 1612 | btrfs_release_path(path); |
2b82032c YZ |
1613 | continue; |
1614 | } | |
1615 | ||
1616 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
1617 | if (key.objectid != BTRFS_DEV_ITEMS_OBJECTID || | |
1618 | key.type != BTRFS_DEV_ITEM_KEY) | |
1619 | break; | |
1620 | ||
1621 | dev_item = btrfs_item_ptr(leaf, path->slots[0], | |
1622 | struct btrfs_dev_item); | |
1623 | devid = btrfs_device_id(leaf, dev_item); | |
1624 | read_extent_buffer(leaf, dev_uuid, | |
1625 | (unsigned long)btrfs_device_uuid(dev_item), | |
1626 | BTRFS_UUID_SIZE); | |
1627 | read_extent_buffer(leaf, fs_uuid, | |
1628 | (unsigned long)btrfs_device_fsid(dev_item), | |
1629 | BTRFS_UUID_SIZE); | |
1630 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
79787eaa | 1631 | BUG_ON(!device); /* Logic error */ |
2b82032c YZ |
1632 | |
1633 | if (device->fs_devices->seeding) { | |
1634 | btrfs_set_device_generation(leaf, dev_item, | |
1635 | device->generation); | |
1636 | btrfs_mark_buffer_dirty(leaf); | |
1637 | } | |
1638 | ||
1639 | path->slots[0]++; | |
1640 | goto next_slot; | |
1641 | } | |
1642 | ret = 0; | |
1643 | error: | |
1644 | btrfs_free_path(path); | |
1645 | return ret; | |
1646 | } | |
1647 | ||
788f20eb CM |
1648 | int btrfs_init_new_device(struct btrfs_root *root, char *device_path) |
1649 | { | |
d5e2003c | 1650 | struct request_queue *q; |
788f20eb CM |
1651 | struct btrfs_trans_handle *trans; |
1652 | struct btrfs_device *device; | |
1653 | struct block_device *bdev; | |
788f20eb | 1654 | struct list_head *devices; |
2b82032c | 1655 | struct super_block *sb = root->fs_info->sb; |
606686ee | 1656 | struct rcu_string *name; |
788f20eb | 1657 | u64 total_bytes; |
2b82032c | 1658 | int seeding_dev = 0; |
788f20eb CM |
1659 | int ret = 0; |
1660 | ||
2b82032c | 1661 | if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding) |
f8c5d0b4 | 1662 | return -EROFS; |
788f20eb | 1663 | |
a5d16333 | 1664 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, |
d4d77629 | 1665 | root->fs_info->bdev_holder); |
7f59203a JB |
1666 | if (IS_ERR(bdev)) |
1667 | return PTR_ERR(bdev); | |
a2135011 | 1668 | |
2b82032c YZ |
1669 | if (root->fs_info->fs_devices->seeding) { |
1670 | seeding_dev = 1; | |
1671 | down_write(&sb->s_umount); | |
1672 | mutex_lock(&uuid_mutex); | |
1673 | } | |
1674 | ||
8c8bee1d | 1675 | filemap_write_and_wait(bdev->bd_inode->i_mapping); |
a2135011 | 1676 | |
788f20eb | 1677 | devices = &root->fs_info->fs_devices->devices; |
e5e9a520 CM |
1678 | /* |
1679 | * we have the volume lock, so we don't need the extra | |
1680 | * device list mutex while reading the list here. | |
1681 | */ | |
c6e30871 | 1682 | list_for_each_entry(device, devices, dev_list) { |
788f20eb CM |
1683 | if (device->bdev == bdev) { |
1684 | ret = -EEXIST; | |
2b82032c | 1685 | goto error; |
788f20eb CM |
1686 | } |
1687 | } | |
1688 | ||
1689 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
1690 | if (!device) { | |
1691 | /* we can safely leave the fs_devices entry around */ | |
1692 | ret = -ENOMEM; | |
2b82032c | 1693 | goto error; |
788f20eb CM |
1694 | } |
1695 | ||
606686ee JB |
1696 | name = rcu_string_strdup(device_path, GFP_NOFS); |
1697 | if (!name) { | |
788f20eb | 1698 | kfree(device); |
2b82032c YZ |
1699 | ret = -ENOMEM; |
1700 | goto error; | |
788f20eb | 1701 | } |
606686ee | 1702 | rcu_assign_pointer(device->name, name); |
2b82032c YZ |
1703 | |
1704 | ret = find_next_devid(root, &device->devid); | |
1705 | if (ret) { | |
606686ee | 1706 | rcu_string_free(device->name); |
2b82032c YZ |
1707 | kfree(device); |
1708 | goto error; | |
1709 | } | |
1710 | ||
a22285a6 | 1711 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 1712 | if (IS_ERR(trans)) { |
606686ee | 1713 | rcu_string_free(device->name); |
98d5dc13 TI |
1714 | kfree(device); |
1715 | ret = PTR_ERR(trans); | |
1716 | goto error; | |
1717 | } | |
1718 | ||
2b82032c YZ |
1719 | lock_chunks(root); |
1720 | ||
d5e2003c JB |
1721 | q = bdev_get_queue(bdev); |
1722 | if (blk_queue_discard(q)) | |
1723 | device->can_discard = 1; | |
2b82032c YZ |
1724 | device->writeable = 1; |
1725 | device->work.func = pending_bios_fn; | |
1726 | generate_random_uuid(device->uuid); | |
1727 | spin_lock_init(&device->io_lock); | |
1728 | device->generation = trans->transid; | |
788f20eb CM |
1729 | device->io_width = root->sectorsize; |
1730 | device->io_align = root->sectorsize; | |
1731 | device->sector_size = root->sectorsize; | |
1732 | device->total_bytes = i_size_read(bdev->bd_inode); | |
2cc3c559 | 1733 | device->disk_total_bytes = device->total_bytes; |
788f20eb CM |
1734 | device->dev_root = root->fs_info->dev_root; |
1735 | device->bdev = bdev; | |
dfe25020 | 1736 | device->in_fs_metadata = 1; |
fb01aa85 | 1737 | device->mode = FMODE_EXCL; |
2b82032c | 1738 | set_blocksize(device->bdev, 4096); |
788f20eb | 1739 | |
2b82032c YZ |
1740 | if (seeding_dev) { |
1741 | sb->s_flags &= ~MS_RDONLY; | |
125ccb0a | 1742 | ret = btrfs_prepare_sprout(root); |
79787eaa | 1743 | BUG_ON(ret); /* -ENOMEM */ |
2b82032c | 1744 | } |
788f20eb | 1745 | |
2b82032c | 1746 | device->fs_devices = root->fs_info->fs_devices; |
e5e9a520 | 1747 | |
e5e9a520 | 1748 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
1f78160c | 1749 | list_add_rcu(&device->dev_list, &root->fs_info->fs_devices->devices); |
2b82032c YZ |
1750 | list_add(&device->dev_alloc_list, |
1751 | &root->fs_info->fs_devices->alloc_list); | |
1752 | root->fs_info->fs_devices->num_devices++; | |
1753 | root->fs_info->fs_devices->open_devices++; | |
1754 | root->fs_info->fs_devices->rw_devices++; | |
02db0844 | 1755 | root->fs_info->fs_devices->total_devices++; |
d5e2003c JB |
1756 | if (device->can_discard) |
1757 | root->fs_info->fs_devices->num_can_discard++; | |
2b82032c | 1758 | root->fs_info->fs_devices->total_rw_bytes += device->total_bytes; |
325cd4ba | 1759 | |
2bf64758 JB |
1760 | spin_lock(&root->fs_info->free_chunk_lock); |
1761 | root->fs_info->free_chunk_space += device->total_bytes; | |
1762 | spin_unlock(&root->fs_info->free_chunk_lock); | |
1763 | ||
c289811c CM |
1764 | if (!blk_queue_nonrot(bdev_get_queue(bdev))) |
1765 | root->fs_info->fs_devices->rotating = 1; | |
1766 | ||
6c41761f DS |
1767 | total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy); |
1768 | btrfs_set_super_total_bytes(root->fs_info->super_copy, | |
788f20eb CM |
1769 | total_bytes + device->total_bytes); |
1770 | ||
6c41761f DS |
1771 | total_bytes = btrfs_super_num_devices(root->fs_info->super_copy); |
1772 | btrfs_set_super_num_devices(root->fs_info->super_copy, | |
788f20eb | 1773 | total_bytes + 1); |
e5e9a520 | 1774 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
788f20eb | 1775 | |
2b82032c YZ |
1776 | if (seeding_dev) { |
1777 | ret = init_first_rw_device(trans, root, device); | |
005d6427 DS |
1778 | if (ret) { |
1779 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 1780 | goto error_trans; |
005d6427 | 1781 | } |
2b82032c | 1782 | ret = btrfs_finish_sprout(trans, root); |
005d6427 DS |
1783 | if (ret) { |
1784 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 1785 | goto error_trans; |
005d6427 | 1786 | } |
2b82032c YZ |
1787 | } else { |
1788 | ret = btrfs_add_device(trans, root, device); | |
005d6427 DS |
1789 | if (ret) { |
1790 | btrfs_abort_transaction(trans, root, ret); | |
79787eaa | 1791 | goto error_trans; |
005d6427 | 1792 | } |
2b82032c YZ |
1793 | } |
1794 | ||
913d952e CM |
1795 | /* |
1796 | * we've got more storage, clear any full flags on the space | |
1797 | * infos | |
1798 | */ | |
1799 | btrfs_clear_space_info_full(root->fs_info); | |
1800 | ||
7d9eb12c | 1801 | unlock_chunks(root); |
79787eaa | 1802 | ret = btrfs_commit_transaction(trans, root); |
a2135011 | 1803 | |
2b82032c YZ |
1804 | if (seeding_dev) { |
1805 | mutex_unlock(&uuid_mutex); | |
1806 | up_write(&sb->s_umount); | |
788f20eb | 1807 | |
79787eaa JM |
1808 | if (ret) /* transaction commit */ |
1809 | return ret; | |
1810 | ||
2b82032c | 1811 | ret = btrfs_relocate_sys_chunks(root); |
79787eaa JM |
1812 | if (ret < 0) |
1813 | btrfs_error(root->fs_info, ret, | |
1814 | "Failed to relocate sys chunks after " | |
1815 | "device initialization. This can be fixed " | |
1816 | "using the \"btrfs balance\" command."); | |
2b82032c | 1817 | } |
c9e9f97b | 1818 | |
2b82032c | 1819 | return ret; |
79787eaa JM |
1820 | |
1821 | error_trans: | |
1822 | unlock_chunks(root); | |
79787eaa | 1823 | btrfs_end_transaction(trans, root); |
606686ee | 1824 | rcu_string_free(device->name); |
79787eaa | 1825 | kfree(device); |
2b82032c | 1826 | error: |
e525fd89 | 1827 | blkdev_put(bdev, FMODE_EXCL); |
2b82032c YZ |
1828 | if (seeding_dev) { |
1829 | mutex_unlock(&uuid_mutex); | |
1830 | up_write(&sb->s_umount); | |
1831 | } | |
c9e9f97b | 1832 | return ret; |
788f20eb CM |
1833 | } |
1834 | ||
d397712b CM |
1835 | static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, |
1836 | struct btrfs_device *device) | |
0b86a832 CM |
1837 | { |
1838 | int ret; | |
1839 | struct btrfs_path *path; | |
1840 | struct btrfs_root *root; | |
1841 | struct btrfs_dev_item *dev_item; | |
1842 | struct extent_buffer *leaf; | |
1843 | struct btrfs_key key; | |
1844 | ||
1845 | root = device->dev_root->fs_info->chunk_root; | |
1846 | ||
1847 | path = btrfs_alloc_path(); | |
1848 | if (!path) | |
1849 | return -ENOMEM; | |
1850 | ||
1851 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
1852 | key.type = BTRFS_DEV_ITEM_KEY; | |
1853 | key.offset = device->devid; | |
1854 | ||
1855 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1856 | if (ret < 0) | |
1857 | goto out; | |
1858 | ||
1859 | if (ret > 0) { | |
1860 | ret = -ENOENT; | |
1861 | goto out; | |
1862 | } | |
1863 | ||
1864 | leaf = path->nodes[0]; | |
1865 | dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); | |
1866 | ||
1867 | btrfs_set_device_id(leaf, dev_item, device->devid); | |
1868 | btrfs_set_device_type(leaf, dev_item, device->type); | |
1869 | btrfs_set_device_io_align(leaf, dev_item, device->io_align); | |
1870 | btrfs_set_device_io_width(leaf, dev_item, device->io_width); | |
1871 | btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); | |
d6397bae | 1872 | btrfs_set_device_total_bytes(leaf, dev_item, device->disk_total_bytes); |
0b86a832 CM |
1873 | btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); |
1874 | btrfs_mark_buffer_dirty(leaf); | |
1875 | ||
1876 | out: | |
1877 | btrfs_free_path(path); | |
1878 | return ret; | |
1879 | } | |
1880 | ||
7d9eb12c | 1881 | static int __btrfs_grow_device(struct btrfs_trans_handle *trans, |
8f18cf13 CM |
1882 | struct btrfs_device *device, u64 new_size) |
1883 | { | |
1884 | struct btrfs_super_block *super_copy = | |
6c41761f | 1885 | device->dev_root->fs_info->super_copy; |
8f18cf13 CM |
1886 | u64 old_total = btrfs_super_total_bytes(super_copy); |
1887 | u64 diff = new_size - device->total_bytes; | |
1888 | ||
2b82032c YZ |
1889 | if (!device->writeable) |
1890 | return -EACCES; | |
1891 | if (new_size <= device->total_bytes) | |
1892 | return -EINVAL; | |
1893 | ||
8f18cf13 | 1894 | btrfs_set_super_total_bytes(super_copy, old_total + diff); |
2b82032c YZ |
1895 | device->fs_devices->total_rw_bytes += diff; |
1896 | ||
1897 | device->total_bytes = new_size; | |
9779b72f | 1898 | device->disk_total_bytes = new_size; |
4184ea7f CM |
1899 | btrfs_clear_space_info_full(device->dev_root->fs_info); |
1900 | ||
8f18cf13 CM |
1901 | return btrfs_update_device(trans, device); |
1902 | } | |
1903 | ||
7d9eb12c CM |
1904 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
1905 | struct btrfs_device *device, u64 new_size) | |
1906 | { | |
1907 | int ret; | |
1908 | lock_chunks(device->dev_root); | |
1909 | ret = __btrfs_grow_device(trans, device, new_size); | |
1910 | unlock_chunks(device->dev_root); | |
1911 | return ret; | |
1912 | } | |
1913 | ||
8f18cf13 CM |
1914 | static int btrfs_free_chunk(struct btrfs_trans_handle *trans, |
1915 | struct btrfs_root *root, | |
1916 | u64 chunk_tree, u64 chunk_objectid, | |
1917 | u64 chunk_offset) | |
1918 | { | |
1919 | int ret; | |
1920 | struct btrfs_path *path; | |
1921 | struct btrfs_key key; | |
1922 | ||
1923 | root = root->fs_info->chunk_root; | |
1924 | path = btrfs_alloc_path(); | |
1925 | if (!path) | |
1926 | return -ENOMEM; | |
1927 | ||
1928 | key.objectid = chunk_objectid; | |
1929 | key.offset = chunk_offset; | |
1930 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
1931 | ||
1932 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
79787eaa JM |
1933 | if (ret < 0) |
1934 | goto out; | |
1935 | else if (ret > 0) { /* Logic error or corruption */ | |
1936 | btrfs_error(root->fs_info, -ENOENT, | |
1937 | "Failed lookup while freeing chunk."); | |
1938 | ret = -ENOENT; | |
1939 | goto out; | |
1940 | } | |
8f18cf13 CM |
1941 | |
1942 | ret = btrfs_del_item(trans, root, path); | |
79787eaa JM |
1943 | if (ret < 0) |
1944 | btrfs_error(root->fs_info, ret, | |
1945 | "Failed to delete chunk item."); | |
1946 | out: | |
8f18cf13 | 1947 | btrfs_free_path(path); |
65a246c5 | 1948 | return ret; |
8f18cf13 CM |
1949 | } |
1950 | ||
b2950863 | 1951 | static int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64 |
8f18cf13 CM |
1952 | chunk_offset) |
1953 | { | |
6c41761f | 1954 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 CM |
1955 | struct btrfs_disk_key *disk_key; |
1956 | struct btrfs_chunk *chunk; | |
1957 | u8 *ptr; | |
1958 | int ret = 0; | |
1959 | u32 num_stripes; | |
1960 | u32 array_size; | |
1961 | u32 len = 0; | |
1962 | u32 cur; | |
1963 | struct btrfs_key key; | |
1964 | ||
1965 | array_size = btrfs_super_sys_array_size(super_copy); | |
1966 | ||
1967 | ptr = super_copy->sys_chunk_array; | |
1968 | cur = 0; | |
1969 | ||
1970 | while (cur < array_size) { | |
1971 | disk_key = (struct btrfs_disk_key *)ptr; | |
1972 | btrfs_disk_key_to_cpu(&key, disk_key); | |
1973 | ||
1974 | len = sizeof(*disk_key); | |
1975 | ||
1976 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { | |
1977 | chunk = (struct btrfs_chunk *)(ptr + len); | |
1978 | num_stripes = btrfs_stack_chunk_num_stripes(chunk); | |
1979 | len += btrfs_chunk_item_size(num_stripes); | |
1980 | } else { | |
1981 | ret = -EIO; | |
1982 | break; | |
1983 | } | |
1984 | if (key.objectid == chunk_objectid && | |
1985 | key.offset == chunk_offset) { | |
1986 | memmove(ptr, ptr + len, array_size - (cur + len)); | |
1987 | array_size -= len; | |
1988 | btrfs_set_super_sys_array_size(super_copy, array_size); | |
1989 | } else { | |
1990 | ptr += len; | |
1991 | cur += len; | |
1992 | } | |
1993 | } | |
1994 | return ret; | |
1995 | } | |
1996 | ||
b2950863 | 1997 | static int btrfs_relocate_chunk(struct btrfs_root *root, |
8f18cf13 CM |
1998 | u64 chunk_tree, u64 chunk_objectid, |
1999 | u64 chunk_offset) | |
2000 | { | |
2001 | struct extent_map_tree *em_tree; | |
2002 | struct btrfs_root *extent_root; | |
2003 | struct btrfs_trans_handle *trans; | |
2004 | struct extent_map *em; | |
2005 | struct map_lookup *map; | |
2006 | int ret; | |
2007 | int i; | |
2008 | ||
2009 | root = root->fs_info->chunk_root; | |
2010 | extent_root = root->fs_info->extent_root; | |
2011 | em_tree = &root->fs_info->mapping_tree.map_tree; | |
2012 | ||
ba1bf481 JB |
2013 | ret = btrfs_can_relocate(extent_root, chunk_offset); |
2014 | if (ret) | |
2015 | return -ENOSPC; | |
2016 | ||
8f18cf13 | 2017 | /* step one, relocate all the extents inside this chunk */ |
1a40e23b | 2018 | ret = btrfs_relocate_block_group(extent_root, chunk_offset); |
a22285a6 YZ |
2019 | if (ret) |
2020 | return ret; | |
8f18cf13 | 2021 | |
a22285a6 | 2022 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 2023 | BUG_ON(IS_ERR(trans)); |
8f18cf13 | 2024 | |
7d9eb12c CM |
2025 | lock_chunks(root); |
2026 | ||
8f18cf13 CM |
2027 | /* |
2028 | * step two, delete the device extents and the | |
2029 | * chunk tree entries | |
2030 | */ | |
890871be | 2031 | read_lock(&em_tree->lock); |
8f18cf13 | 2032 | em = lookup_extent_mapping(em_tree, chunk_offset, 1); |
890871be | 2033 | read_unlock(&em_tree->lock); |
8f18cf13 | 2034 | |
285190d9 | 2035 | BUG_ON(!em || em->start > chunk_offset || |
a061fc8d | 2036 | em->start + em->len < chunk_offset); |
8f18cf13 CM |
2037 | map = (struct map_lookup *)em->bdev; |
2038 | ||
2039 | for (i = 0; i < map->num_stripes; i++) { | |
2040 | ret = btrfs_free_dev_extent(trans, map->stripes[i].dev, | |
2041 | map->stripes[i].physical); | |
2042 | BUG_ON(ret); | |
a061fc8d | 2043 | |
dfe25020 CM |
2044 | if (map->stripes[i].dev) { |
2045 | ret = btrfs_update_device(trans, map->stripes[i].dev); | |
2046 | BUG_ON(ret); | |
2047 | } | |
8f18cf13 CM |
2048 | } |
2049 | ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid, | |
2050 | chunk_offset); | |
2051 | ||
2052 | BUG_ON(ret); | |
2053 | ||
1abe9b8a | 2054 | trace_btrfs_chunk_free(root, map, chunk_offset, em->len); |
2055 | ||
8f18cf13 CM |
2056 | if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2057 | ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); | |
2058 | BUG_ON(ret); | |
8f18cf13 CM |
2059 | } |
2060 | ||
2b82032c YZ |
2061 | ret = btrfs_remove_block_group(trans, extent_root, chunk_offset); |
2062 | BUG_ON(ret); | |
2063 | ||
890871be | 2064 | write_lock(&em_tree->lock); |
2b82032c | 2065 | remove_extent_mapping(em_tree, em); |
890871be | 2066 | write_unlock(&em_tree->lock); |
2b82032c YZ |
2067 | |
2068 | kfree(map); | |
2069 | em->bdev = NULL; | |
2070 | ||
2071 | /* once for the tree */ | |
2072 | free_extent_map(em); | |
2073 | /* once for us */ | |
2074 | free_extent_map(em); | |
2075 | ||
2076 | unlock_chunks(root); | |
2077 | btrfs_end_transaction(trans, root); | |
2078 | return 0; | |
2079 | } | |
2080 | ||
2081 | static int btrfs_relocate_sys_chunks(struct btrfs_root *root) | |
2082 | { | |
2083 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; | |
2084 | struct btrfs_path *path; | |
2085 | struct extent_buffer *leaf; | |
2086 | struct btrfs_chunk *chunk; | |
2087 | struct btrfs_key key; | |
2088 | struct btrfs_key found_key; | |
2089 | u64 chunk_tree = chunk_root->root_key.objectid; | |
2090 | u64 chunk_type; | |
ba1bf481 JB |
2091 | bool retried = false; |
2092 | int failed = 0; | |
2b82032c YZ |
2093 | int ret; |
2094 | ||
2095 | path = btrfs_alloc_path(); | |
2096 | if (!path) | |
2097 | return -ENOMEM; | |
2098 | ||
ba1bf481 | 2099 | again: |
2b82032c YZ |
2100 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2101 | key.offset = (u64)-1; | |
2102 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2103 | ||
2104 | while (1) { | |
2105 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); | |
2106 | if (ret < 0) | |
2107 | goto error; | |
79787eaa | 2108 | BUG_ON(ret == 0); /* Corruption */ |
2b82032c YZ |
2109 | |
2110 | ret = btrfs_previous_item(chunk_root, path, key.objectid, | |
2111 | key.type); | |
2112 | if (ret < 0) | |
2113 | goto error; | |
2114 | if (ret > 0) | |
2115 | break; | |
1a40e23b | 2116 | |
2b82032c YZ |
2117 | leaf = path->nodes[0]; |
2118 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1a40e23b | 2119 | |
2b82032c YZ |
2120 | chunk = btrfs_item_ptr(leaf, path->slots[0], |
2121 | struct btrfs_chunk); | |
2122 | chunk_type = btrfs_chunk_type(leaf, chunk); | |
b3b4aa74 | 2123 | btrfs_release_path(path); |
8f18cf13 | 2124 | |
2b82032c YZ |
2125 | if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) { |
2126 | ret = btrfs_relocate_chunk(chunk_root, chunk_tree, | |
2127 | found_key.objectid, | |
2128 | found_key.offset); | |
ba1bf481 JB |
2129 | if (ret == -ENOSPC) |
2130 | failed++; | |
2131 | else if (ret) | |
2132 | BUG(); | |
2b82032c | 2133 | } |
8f18cf13 | 2134 | |
2b82032c YZ |
2135 | if (found_key.offset == 0) |
2136 | break; | |
2137 | key.offset = found_key.offset - 1; | |
2138 | } | |
2139 | ret = 0; | |
ba1bf481 JB |
2140 | if (failed && !retried) { |
2141 | failed = 0; | |
2142 | retried = true; | |
2143 | goto again; | |
2144 | } else if (failed && retried) { | |
2145 | WARN_ON(1); | |
2146 | ret = -ENOSPC; | |
2147 | } | |
2b82032c YZ |
2148 | error: |
2149 | btrfs_free_path(path); | |
2150 | return ret; | |
8f18cf13 CM |
2151 | } |
2152 | ||
0940ebf6 ID |
2153 | static int insert_balance_item(struct btrfs_root *root, |
2154 | struct btrfs_balance_control *bctl) | |
2155 | { | |
2156 | struct btrfs_trans_handle *trans; | |
2157 | struct btrfs_balance_item *item; | |
2158 | struct btrfs_disk_balance_args disk_bargs; | |
2159 | struct btrfs_path *path; | |
2160 | struct extent_buffer *leaf; | |
2161 | struct btrfs_key key; | |
2162 | int ret, err; | |
2163 | ||
2164 | path = btrfs_alloc_path(); | |
2165 | if (!path) | |
2166 | return -ENOMEM; | |
2167 | ||
2168 | trans = btrfs_start_transaction(root, 0); | |
2169 | if (IS_ERR(trans)) { | |
2170 | btrfs_free_path(path); | |
2171 | return PTR_ERR(trans); | |
2172 | } | |
2173 | ||
2174 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
2175 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
2176 | key.offset = 0; | |
2177 | ||
2178 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
2179 | sizeof(*item)); | |
2180 | if (ret) | |
2181 | goto out; | |
2182 | ||
2183 | leaf = path->nodes[0]; | |
2184 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
2185 | ||
2186 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); | |
2187 | ||
2188 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data); | |
2189 | btrfs_set_balance_data(leaf, item, &disk_bargs); | |
2190 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->meta); | |
2191 | btrfs_set_balance_meta(leaf, item, &disk_bargs); | |
2192 | btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->sys); | |
2193 | btrfs_set_balance_sys(leaf, item, &disk_bargs); | |
2194 | ||
2195 | btrfs_set_balance_flags(leaf, item, bctl->flags); | |
2196 | ||
2197 | btrfs_mark_buffer_dirty(leaf); | |
2198 | out: | |
2199 | btrfs_free_path(path); | |
2200 | err = btrfs_commit_transaction(trans, root); | |
2201 | if (err && !ret) | |
2202 | ret = err; | |
2203 | return ret; | |
2204 | } | |
2205 | ||
2206 | static int del_balance_item(struct btrfs_root *root) | |
2207 | { | |
2208 | struct btrfs_trans_handle *trans; | |
2209 | struct btrfs_path *path; | |
2210 | struct btrfs_key key; | |
2211 | int ret, err; | |
2212 | ||
2213 | path = btrfs_alloc_path(); | |
2214 | if (!path) | |
2215 | return -ENOMEM; | |
2216 | ||
2217 | trans = btrfs_start_transaction(root, 0); | |
2218 | if (IS_ERR(trans)) { | |
2219 | btrfs_free_path(path); | |
2220 | return PTR_ERR(trans); | |
2221 | } | |
2222 | ||
2223 | key.objectid = BTRFS_BALANCE_OBJECTID; | |
2224 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
2225 | key.offset = 0; | |
2226 | ||
2227 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
2228 | if (ret < 0) | |
2229 | goto out; | |
2230 | if (ret > 0) { | |
2231 | ret = -ENOENT; | |
2232 | goto out; | |
2233 | } | |
2234 | ||
2235 | ret = btrfs_del_item(trans, root, path); | |
2236 | out: | |
2237 | btrfs_free_path(path); | |
2238 | err = btrfs_commit_transaction(trans, root); | |
2239 | if (err && !ret) | |
2240 | ret = err; | |
2241 | return ret; | |
2242 | } | |
2243 | ||
59641015 ID |
2244 | /* |
2245 | * This is a heuristic used to reduce the number of chunks balanced on | |
2246 | * resume after balance was interrupted. | |
2247 | */ | |
2248 | static void update_balance_args(struct btrfs_balance_control *bctl) | |
2249 | { | |
2250 | /* | |
2251 | * Turn on soft mode for chunk types that were being converted. | |
2252 | */ | |
2253 | if (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
2254 | bctl->data.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
2255 | if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
2256 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
2257 | if (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) | |
2258 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_SOFT; | |
2259 | ||
2260 | /* | |
2261 | * Turn on usage filter if is not already used. The idea is | |
2262 | * that chunks that we have already balanced should be | |
2263 | * reasonably full. Don't do it for chunks that are being | |
2264 | * converted - that will keep us from relocating unconverted | |
2265 | * (albeit full) chunks. | |
2266 | */ | |
2267 | if (!(bctl->data.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2268 | !(bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
2269 | bctl->data.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
2270 | bctl->data.usage = 90; | |
2271 | } | |
2272 | if (!(bctl->sys.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2273 | !(bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
2274 | bctl->sys.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
2275 | bctl->sys.usage = 90; | |
2276 | } | |
2277 | if (!(bctl->meta.flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2278 | !(bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)) { | |
2279 | bctl->meta.flags |= BTRFS_BALANCE_ARGS_USAGE; | |
2280 | bctl->meta.usage = 90; | |
2281 | } | |
2282 | } | |
2283 | ||
c9e9f97b ID |
2284 | /* |
2285 | * Should be called with both balance and volume mutexes held to | |
2286 | * serialize other volume operations (add_dev/rm_dev/resize) with | |
2287 | * restriper. Same goes for unset_balance_control. | |
2288 | */ | |
2289 | static void set_balance_control(struct btrfs_balance_control *bctl) | |
2290 | { | |
2291 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
2292 | ||
2293 | BUG_ON(fs_info->balance_ctl); | |
2294 | ||
2295 | spin_lock(&fs_info->balance_lock); | |
2296 | fs_info->balance_ctl = bctl; | |
2297 | spin_unlock(&fs_info->balance_lock); | |
2298 | } | |
2299 | ||
2300 | static void unset_balance_control(struct btrfs_fs_info *fs_info) | |
2301 | { | |
2302 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
2303 | ||
2304 | BUG_ON(!fs_info->balance_ctl); | |
2305 | ||
2306 | spin_lock(&fs_info->balance_lock); | |
2307 | fs_info->balance_ctl = NULL; | |
2308 | spin_unlock(&fs_info->balance_lock); | |
2309 | ||
2310 | kfree(bctl); | |
2311 | } | |
2312 | ||
ed25e9b2 ID |
2313 | /* |
2314 | * Balance filters. Return 1 if chunk should be filtered out | |
2315 | * (should not be balanced). | |
2316 | */ | |
899c81ea | 2317 | static int chunk_profiles_filter(u64 chunk_type, |
ed25e9b2 ID |
2318 | struct btrfs_balance_args *bargs) |
2319 | { | |
899c81ea ID |
2320 | chunk_type = chunk_to_extended(chunk_type) & |
2321 | BTRFS_EXTENDED_PROFILE_MASK; | |
ed25e9b2 | 2322 | |
899c81ea | 2323 | if (bargs->profiles & chunk_type) |
ed25e9b2 ID |
2324 | return 0; |
2325 | ||
2326 | return 1; | |
2327 | } | |
2328 | ||
5ce5b3c0 ID |
2329 | static u64 div_factor_fine(u64 num, int factor) |
2330 | { | |
2331 | if (factor <= 0) | |
2332 | return 0; | |
2333 | if (factor >= 100) | |
2334 | return num; | |
2335 | ||
2336 | num *= factor; | |
2337 | do_div(num, 100); | |
2338 | return num; | |
2339 | } | |
2340 | ||
2341 | static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset, | |
2342 | struct btrfs_balance_args *bargs) | |
2343 | { | |
2344 | struct btrfs_block_group_cache *cache; | |
2345 | u64 chunk_used, user_thresh; | |
2346 | int ret = 1; | |
2347 | ||
2348 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
2349 | chunk_used = btrfs_block_group_used(&cache->item); | |
2350 | ||
2351 | user_thresh = div_factor_fine(cache->key.offset, bargs->usage); | |
2352 | if (chunk_used < user_thresh) | |
2353 | ret = 0; | |
2354 | ||
2355 | btrfs_put_block_group(cache); | |
2356 | return ret; | |
2357 | } | |
2358 | ||
409d404b ID |
2359 | static int chunk_devid_filter(struct extent_buffer *leaf, |
2360 | struct btrfs_chunk *chunk, | |
2361 | struct btrfs_balance_args *bargs) | |
2362 | { | |
2363 | struct btrfs_stripe *stripe; | |
2364 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
2365 | int i; | |
2366 | ||
2367 | for (i = 0; i < num_stripes; i++) { | |
2368 | stripe = btrfs_stripe_nr(chunk, i); | |
2369 | if (btrfs_stripe_devid(leaf, stripe) == bargs->devid) | |
2370 | return 0; | |
2371 | } | |
2372 | ||
2373 | return 1; | |
2374 | } | |
2375 | ||
94e60d5a ID |
2376 | /* [pstart, pend) */ |
2377 | static int chunk_drange_filter(struct extent_buffer *leaf, | |
2378 | struct btrfs_chunk *chunk, | |
2379 | u64 chunk_offset, | |
2380 | struct btrfs_balance_args *bargs) | |
2381 | { | |
2382 | struct btrfs_stripe *stripe; | |
2383 | int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); | |
2384 | u64 stripe_offset; | |
2385 | u64 stripe_length; | |
2386 | int factor; | |
2387 | int i; | |
2388 | ||
2389 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_DEVID)) | |
2390 | return 0; | |
2391 | ||
2392 | if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP | | |
2393 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)) | |
2394 | factor = 2; | |
2395 | else | |
2396 | factor = 1; | |
2397 | factor = num_stripes / factor; | |
2398 | ||
2399 | for (i = 0; i < num_stripes; i++) { | |
2400 | stripe = btrfs_stripe_nr(chunk, i); | |
2401 | if (btrfs_stripe_devid(leaf, stripe) != bargs->devid) | |
2402 | continue; | |
2403 | ||
2404 | stripe_offset = btrfs_stripe_offset(leaf, stripe); | |
2405 | stripe_length = btrfs_chunk_length(leaf, chunk); | |
2406 | do_div(stripe_length, factor); | |
2407 | ||
2408 | if (stripe_offset < bargs->pend && | |
2409 | stripe_offset + stripe_length > bargs->pstart) | |
2410 | return 0; | |
2411 | } | |
2412 | ||
2413 | return 1; | |
2414 | } | |
2415 | ||
ea67176a ID |
2416 | /* [vstart, vend) */ |
2417 | static int chunk_vrange_filter(struct extent_buffer *leaf, | |
2418 | struct btrfs_chunk *chunk, | |
2419 | u64 chunk_offset, | |
2420 | struct btrfs_balance_args *bargs) | |
2421 | { | |
2422 | if (chunk_offset < bargs->vend && | |
2423 | chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart) | |
2424 | /* at least part of the chunk is inside this vrange */ | |
2425 | return 0; | |
2426 | ||
2427 | return 1; | |
2428 | } | |
2429 | ||
899c81ea | 2430 | static int chunk_soft_convert_filter(u64 chunk_type, |
cfa4c961 ID |
2431 | struct btrfs_balance_args *bargs) |
2432 | { | |
2433 | if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT)) | |
2434 | return 0; | |
2435 | ||
899c81ea ID |
2436 | chunk_type = chunk_to_extended(chunk_type) & |
2437 | BTRFS_EXTENDED_PROFILE_MASK; | |
cfa4c961 | 2438 | |
899c81ea | 2439 | if (bargs->target == chunk_type) |
cfa4c961 ID |
2440 | return 1; |
2441 | ||
2442 | return 0; | |
2443 | } | |
2444 | ||
f43ffb60 ID |
2445 | static int should_balance_chunk(struct btrfs_root *root, |
2446 | struct extent_buffer *leaf, | |
2447 | struct btrfs_chunk *chunk, u64 chunk_offset) | |
2448 | { | |
2449 | struct btrfs_balance_control *bctl = root->fs_info->balance_ctl; | |
2450 | struct btrfs_balance_args *bargs = NULL; | |
2451 | u64 chunk_type = btrfs_chunk_type(leaf, chunk); | |
2452 | ||
2453 | /* type filter */ | |
2454 | if (!((chunk_type & BTRFS_BLOCK_GROUP_TYPE_MASK) & | |
2455 | (bctl->flags & BTRFS_BALANCE_TYPE_MASK))) { | |
2456 | return 0; | |
2457 | } | |
2458 | ||
2459 | if (chunk_type & BTRFS_BLOCK_GROUP_DATA) | |
2460 | bargs = &bctl->data; | |
2461 | else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM) | |
2462 | bargs = &bctl->sys; | |
2463 | else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA) | |
2464 | bargs = &bctl->meta; | |
2465 | ||
ed25e9b2 ID |
2466 | /* profiles filter */ |
2467 | if ((bargs->flags & BTRFS_BALANCE_ARGS_PROFILES) && | |
2468 | chunk_profiles_filter(chunk_type, bargs)) { | |
2469 | return 0; | |
5ce5b3c0 ID |
2470 | } |
2471 | ||
2472 | /* usage filter */ | |
2473 | if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) && | |
2474 | chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) { | |
2475 | return 0; | |
409d404b ID |
2476 | } |
2477 | ||
2478 | /* devid filter */ | |
2479 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DEVID) && | |
2480 | chunk_devid_filter(leaf, chunk, bargs)) { | |
2481 | return 0; | |
94e60d5a ID |
2482 | } |
2483 | ||
2484 | /* drange filter, makes sense only with devid filter */ | |
2485 | if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) && | |
2486 | chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) { | |
2487 | return 0; | |
ea67176a ID |
2488 | } |
2489 | ||
2490 | /* vrange filter */ | |
2491 | if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) && | |
2492 | chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) { | |
2493 | return 0; | |
ed25e9b2 ID |
2494 | } |
2495 | ||
cfa4c961 ID |
2496 | /* soft profile changing mode */ |
2497 | if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) && | |
2498 | chunk_soft_convert_filter(chunk_type, bargs)) { | |
2499 | return 0; | |
2500 | } | |
2501 | ||
f43ffb60 ID |
2502 | return 1; |
2503 | } | |
2504 | ||
ec44a35c CM |
2505 | static u64 div_factor(u64 num, int factor) |
2506 | { | |
2507 | if (factor == 10) | |
2508 | return num; | |
2509 | num *= factor; | |
2510 | do_div(num, 10); | |
2511 | return num; | |
2512 | } | |
2513 | ||
c9e9f97b | 2514 | static int __btrfs_balance(struct btrfs_fs_info *fs_info) |
ec44a35c | 2515 | { |
19a39dce | 2516 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
c9e9f97b ID |
2517 | struct btrfs_root *chunk_root = fs_info->chunk_root; |
2518 | struct btrfs_root *dev_root = fs_info->dev_root; | |
2519 | struct list_head *devices; | |
ec44a35c CM |
2520 | struct btrfs_device *device; |
2521 | u64 old_size; | |
2522 | u64 size_to_free; | |
f43ffb60 | 2523 | struct btrfs_chunk *chunk; |
ec44a35c CM |
2524 | struct btrfs_path *path; |
2525 | struct btrfs_key key; | |
ec44a35c | 2526 | struct btrfs_key found_key; |
c9e9f97b | 2527 | struct btrfs_trans_handle *trans; |
f43ffb60 ID |
2528 | struct extent_buffer *leaf; |
2529 | int slot; | |
c9e9f97b ID |
2530 | int ret; |
2531 | int enospc_errors = 0; | |
19a39dce | 2532 | bool counting = true; |
ec44a35c | 2533 | |
ec44a35c | 2534 | /* step one make some room on all the devices */ |
c9e9f97b | 2535 | devices = &fs_info->fs_devices->devices; |
c6e30871 | 2536 | list_for_each_entry(device, devices, dev_list) { |
ec44a35c CM |
2537 | old_size = device->total_bytes; |
2538 | size_to_free = div_factor(old_size, 1); | |
2539 | size_to_free = min(size_to_free, (u64)1 * 1024 * 1024); | |
2b82032c YZ |
2540 | if (!device->writeable || |
2541 | device->total_bytes - device->bytes_used > size_to_free) | |
ec44a35c CM |
2542 | continue; |
2543 | ||
2544 | ret = btrfs_shrink_device(device, old_size - size_to_free); | |
ba1bf481 JB |
2545 | if (ret == -ENOSPC) |
2546 | break; | |
ec44a35c CM |
2547 | BUG_ON(ret); |
2548 | ||
a22285a6 | 2549 | trans = btrfs_start_transaction(dev_root, 0); |
98d5dc13 | 2550 | BUG_ON(IS_ERR(trans)); |
ec44a35c CM |
2551 | |
2552 | ret = btrfs_grow_device(trans, device, old_size); | |
2553 | BUG_ON(ret); | |
2554 | ||
2555 | btrfs_end_transaction(trans, dev_root); | |
2556 | } | |
2557 | ||
2558 | /* step two, relocate all the chunks */ | |
2559 | path = btrfs_alloc_path(); | |
17e9f796 MF |
2560 | if (!path) { |
2561 | ret = -ENOMEM; | |
2562 | goto error; | |
2563 | } | |
19a39dce ID |
2564 | |
2565 | /* zero out stat counters */ | |
2566 | spin_lock(&fs_info->balance_lock); | |
2567 | memset(&bctl->stat, 0, sizeof(bctl->stat)); | |
2568 | spin_unlock(&fs_info->balance_lock); | |
2569 | again: | |
ec44a35c CM |
2570 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
2571 | key.offset = (u64)-1; | |
2572 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
2573 | ||
d397712b | 2574 | while (1) { |
19a39dce | 2575 | if ((!counting && atomic_read(&fs_info->balance_pause_req)) || |
a7e99c69 | 2576 | atomic_read(&fs_info->balance_cancel_req)) { |
837d5b6e ID |
2577 | ret = -ECANCELED; |
2578 | goto error; | |
2579 | } | |
2580 | ||
ec44a35c CM |
2581 | ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); |
2582 | if (ret < 0) | |
2583 | goto error; | |
2584 | ||
2585 | /* | |
2586 | * this shouldn't happen, it means the last relocate | |
2587 | * failed | |
2588 | */ | |
2589 | if (ret == 0) | |
c9e9f97b | 2590 | BUG(); /* FIXME break ? */ |
ec44a35c CM |
2591 | |
2592 | ret = btrfs_previous_item(chunk_root, path, 0, | |
2593 | BTRFS_CHUNK_ITEM_KEY); | |
c9e9f97b ID |
2594 | if (ret) { |
2595 | ret = 0; | |
ec44a35c | 2596 | break; |
c9e9f97b | 2597 | } |
7d9eb12c | 2598 | |
f43ffb60 ID |
2599 | leaf = path->nodes[0]; |
2600 | slot = path->slots[0]; | |
2601 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
7d9eb12c | 2602 | |
ec44a35c CM |
2603 | if (found_key.objectid != key.objectid) |
2604 | break; | |
7d9eb12c | 2605 | |
ec44a35c | 2606 | /* chunk zero is special */ |
ba1bf481 | 2607 | if (found_key.offset == 0) |
ec44a35c CM |
2608 | break; |
2609 | ||
f43ffb60 ID |
2610 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); |
2611 | ||
19a39dce ID |
2612 | if (!counting) { |
2613 | spin_lock(&fs_info->balance_lock); | |
2614 | bctl->stat.considered++; | |
2615 | spin_unlock(&fs_info->balance_lock); | |
2616 | } | |
2617 | ||
f43ffb60 ID |
2618 | ret = should_balance_chunk(chunk_root, leaf, chunk, |
2619 | found_key.offset); | |
b3b4aa74 | 2620 | btrfs_release_path(path); |
f43ffb60 ID |
2621 | if (!ret) |
2622 | goto loop; | |
2623 | ||
19a39dce ID |
2624 | if (counting) { |
2625 | spin_lock(&fs_info->balance_lock); | |
2626 | bctl->stat.expected++; | |
2627 | spin_unlock(&fs_info->balance_lock); | |
2628 | goto loop; | |
2629 | } | |
2630 | ||
ec44a35c CM |
2631 | ret = btrfs_relocate_chunk(chunk_root, |
2632 | chunk_root->root_key.objectid, | |
2633 | found_key.objectid, | |
2634 | found_key.offset); | |
508794eb JB |
2635 | if (ret && ret != -ENOSPC) |
2636 | goto error; | |
19a39dce | 2637 | if (ret == -ENOSPC) { |
c9e9f97b | 2638 | enospc_errors++; |
19a39dce ID |
2639 | } else { |
2640 | spin_lock(&fs_info->balance_lock); | |
2641 | bctl->stat.completed++; | |
2642 | spin_unlock(&fs_info->balance_lock); | |
2643 | } | |
f43ffb60 | 2644 | loop: |
ba1bf481 | 2645 | key.offset = found_key.offset - 1; |
ec44a35c | 2646 | } |
c9e9f97b | 2647 | |
19a39dce ID |
2648 | if (counting) { |
2649 | btrfs_release_path(path); | |
2650 | counting = false; | |
2651 | goto again; | |
2652 | } | |
ec44a35c CM |
2653 | error: |
2654 | btrfs_free_path(path); | |
c9e9f97b ID |
2655 | if (enospc_errors) { |
2656 | printk(KERN_INFO "btrfs: %d enospc errors during balance\n", | |
2657 | enospc_errors); | |
2658 | if (!ret) | |
2659 | ret = -ENOSPC; | |
2660 | } | |
2661 | ||
ec44a35c CM |
2662 | return ret; |
2663 | } | |
2664 | ||
0c460c0d ID |
2665 | /** |
2666 | * alloc_profile_is_valid - see if a given profile is valid and reduced | |
2667 | * @flags: profile to validate | |
2668 | * @extended: if true @flags is treated as an extended profile | |
2669 | */ | |
2670 | static int alloc_profile_is_valid(u64 flags, int extended) | |
2671 | { | |
2672 | u64 mask = (extended ? BTRFS_EXTENDED_PROFILE_MASK : | |
2673 | BTRFS_BLOCK_GROUP_PROFILE_MASK); | |
2674 | ||
2675 | flags &= ~BTRFS_BLOCK_GROUP_TYPE_MASK; | |
2676 | ||
2677 | /* 1) check that all other bits are zeroed */ | |
2678 | if (flags & ~mask) | |
2679 | return 0; | |
2680 | ||
2681 | /* 2) see if profile is reduced */ | |
2682 | if (flags == 0) | |
2683 | return !extended; /* "0" is valid for usual profiles */ | |
2684 | ||
2685 | /* true if exactly one bit set */ | |
2686 | return (flags & (flags - 1)) == 0; | |
2687 | } | |
2688 | ||
837d5b6e ID |
2689 | static inline int balance_need_close(struct btrfs_fs_info *fs_info) |
2690 | { | |
a7e99c69 ID |
2691 | /* cancel requested || normal exit path */ |
2692 | return atomic_read(&fs_info->balance_cancel_req) || | |
2693 | (atomic_read(&fs_info->balance_pause_req) == 0 && | |
2694 | atomic_read(&fs_info->balance_cancel_req) == 0); | |
837d5b6e ID |
2695 | } |
2696 | ||
c9e9f97b ID |
2697 | static void __cancel_balance(struct btrfs_fs_info *fs_info) |
2698 | { | |
0940ebf6 ID |
2699 | int ret; |
2700 | ||
c9e9f97b | 2701 | unset_balance_control(fs_info); |
0940ebf6 ID |
2702 | ret = del_balance_item(fs_info->tree_root); |
2703 | BUG_ON(ret); | |
c9e9f97b ID |
2704 | } |
2705 | ||
19a39dce | 2706 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
2707 | struct btrfs_ioctl_balance_args *bargs); |
2708 | ||
2709 | /* | |
2710 | * Should be called with both balance and volume mutexes held | |
2711 | */ | |
2712 | int btrfs_balance(struct btrfs_balance_control *bctl, | |
2713 | struct btrfs_ioctl_balance_args *bargs) | |
2714 | { | |
2715 | struct btrfs_fs_info *fs_info = bctl->fs_info; | |
f43ffb60 | 2716 | u64 allowed; |
e4837f8f | 2717 | int mixed = 0; |
c9e9f97b ID |
2718 | int ret; |
2719 | ||
837d5b6e | 2720 | if (btrfs_fs_closing(fs_info) || |
a7e99c69 ID |
2721 | atomic_read(&fs_info->balance_pause_req) || |
2722 | atomic_read(&fs_info->balance_cancel_req)) { | |
c9e9f97b ID |
2723 | ret = -EINVAL; |
2724 | goto out; | |
2725 | } | |
2726 | ||
e4837f8f ID |
2727 | allowed = btrfs_super_incompat_flags(fs_info->super_copy); |
2728 | if (allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) | |
2729 | mixed = 1; | |
2730 | ||
f43ffb60 ID |
2731 | /* |
2732 | * In case of mixed groups both data and meta should be picked, | |
2733 | * and identical options should be given for both of them. | |
2734 | */ | |
e4837f8f ID |
2735 | allowed = BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA; |
2736 | if (mixed && (bctl->flags & allowed)) { | |
f43ffb60 ID |
2737 | if (!(bctl->flags & BTRFS_BALANCE_DATA) || |
2738 | !(bctl->flags & BTRFS_BALANCE_METADATA) || | |
2739 | memcmp(&bctl->data, &bctl->meta, sizeof(bctl->data))) { | |
2740 | printk(KERN_ERR "btrfs: with mixed groups data and " | |
2741 | "metadata balance options must be the same\n"); | |
2742 | ret = -EINVAL; | |
2743 | goto out; | |
2744 | } | |
2745 | } | |
2746 | ||
e4d8ec0f ID |
2747 | allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE; |
2748 | if (fs_info->fs_devices->num_devices == 1) | |
2749 | allowed |= BTRFS_BLOCK_GROUP_DUP; | |
2750 | else if (fs_info->fs_devices->num_devices < 4) | |
2751 | allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1); | |
2752 | else | |
2753 | allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 | | |
2754 | BTRFS_BLOCK_GROUP_RAID10); | |
2755 | ||
6728b198 ID |
2756 | if ((bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) && |
2757 | (!alloc_profile_is_valid(bctl->data.target, 1) || | |
2758 | (bctl->data.target & ~allowed))) { | |
e4d8ec0f ID |
2759 | printk(KERN_ERR "btrfs: unable to start balance with target " |
2760 | "data profile %llu\n", | |
2761 | (unsigned long long)bctl->data.target); | |
2762 | ret = -EINVAL; | |
2763 | goto out; | |
2764 | } | |
6728b198 ID |
2765 | if ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) && |
2766 | (!alloc_profile_is_valid(bctl->meta.target, 1) || | |
2767 | (bctl->meta.target & ~allowed))) { | |
e4d8ec0f ID |
2768 | printk(KERN_ERR "btrfs: unable to start balance with target " |
2769 | "metadata profile %llu\n", | |
2770 | (unsigned long long)bctl->meta.target); | |
2771 | ret = -EINVAL; | |
2772 | goto out; | |
2773 | } | |
6728b198 ID |
2774 | if ((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) && |
2775 | (!alloc_profile_is_valid(bctl->sys.target, 1) || | |
2776 | (bctl->sys.target & ~allowed))) { | |
e4d8ec0f ID |
2777 | printk(KERN_ERR "btrfs: unable to start balance with target " |
2778 | "system profile %llu\n", | |
2779 | (unsigned long long)bctl->sys.target); | |
2780 | ret = -EINVAL; | |
2781 | goto out; | |
2782 | } | |
2783 | ||
e4837f8f ID |
2784 | /* allow dup'ed data chunks only in mixed mode */ |
2785 | if (!mixed && (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
6728b198 | 2786 | (bctl->data.target & BTRFS_BLOCK_GROUP_DUP)) { |
e4d8ec0f ID |
2787 | printk(KERN_ERR "btrfs: dup for data is not allowed\n"); |
2788 | ret = -EINVAL; | |
2789 | goto out; | |
2790 | } | |
2791 | ||
2792 | /* allow to reduce meta or sys integrity only if force set */ | |
2793 | allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 | | |
2794 | BTRFS_BLOCK_GROUP_RAID10; | |
2795 | if (((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
2796 | (fs_info->avail_system_alloc_bits & allowed) && | |
2797 | !(bctl->sys.target & allowed)) || | |
2798 | ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) && | |
2799 | (fs_info->avail_metadata_alloc_bits & allowed) && | |
2800 | !(bctl->meta.target & allowed))) { | |
2801 | if (bctl->flags & BTRFS_BALANCE_FORCE) { | |
2802 | printk(KERN_INFO "btrfs: force reducing metadata " | |
2803 | "integrity\n"); | |
2804 | } else { | |
2805 | printk(KERN_ERR "btrfs: balance will reduce metadata " | |
2806 | "integrity, use force if you want this\n"); | |
2807 | ret = -EINVAL; | |
2808 | goto out; | |
2809 | } | |
2810 | } | |
2811 | ||
0940ebf6 | 2812 | ret = insert_balance_item(fs_info->tree_root, bctl); |
59641015 | 2813 | if (ret && ret != -EEXIST) |
0940ebf6 ID |
2814 | goto out; |
2815 | ||
59641015 ID |
2816 | if (!(bctl->flags & BTRFS_BALANCE_RESUME)) { |
2817 | BUG_ON(ret == -EEXIST); | |
2818 | set_balance_control(bctl); | |
2819 | } else { | |
2820 | BUG_ON(ret != -EEXIST); | |
2821 | spin_lock(&fs_info->balance_lock); | |
2822 | update_balance_args(bctl); | |
2823 | spin_unlock(&fs_info->balance_lock); | |
2824 | } | |
c9e9f97b | 2825 | |
837d5b6e | 2826 | atomic_inc(&fs_info->balance_running); |
c9e9f97b ID |
2827 | mutex_unlock(&fs_info->balance_mutex); |
2828 | ||
2829 | ret = __btrfs_balance(fs_info); | |
2830 | ||
2831 | mutex_lock(&fs_info->balance_mutex); | |
837d5b6e | 2832 | atomic_dec(&fs_info->balance_running); |
c9e9f97b ID |
2833 | |
2834 | if (bargs) { | |
2835 | memset(bargs, 0, sizeof(*bargs)); | |
19a39dce | 2836 | update_ioctl_balance_args(fs_info, 0, bargs); |
c9e9f97b ID |
2837 | } |
2838 | ||
837d5b6e ID |
2839 | if ((ret && ret != -ECANCELED && ret != -ENOSPC) || |
2840 | balance_need_close(fs_info)) { | |
2841 | __cancel_balance(fs_info); | |
2842 | } | |
2843 | ||
2844 | wake_up(&fs_info->balance_wait_q); | |
c9e9f97b ID |
2845 | |
2846 | return ret; | |
2847 | out: | |
59641015 ID |
2848 | if (bctl->flags & BTRFS_BALANCE_RESUME) |
2849 | __cancel_balance(fs_info); | |
2850 | else | |
2851 | kfree(bctl); | |
2852 | return ret; | |
2853 | } | |
2854 | ||
2855 | static int balance_kthread(void *data) | |
2856 | { | |
2b6ba629 | 2857 | struct btrfs_fs_info *fs_info = data; |
9555c6c1 | 2858 | int ret = 0; |
59641015 ID |
2859 | |
2860 | mutex_lock(&fs_info->volume_mutex); | |
2861 | mutex_lock(&fs_info->balance_mutex); | |
2862 | ||
2b6ba629 | 2863 | if (fs_info->balance_ctl) { |
9555c6c1 | 2864 | printk(KERN_INFO "btrfs: continuing balance\n"); |
2b6ba629 | 2865 | ret = btrfs_balance(fs_info->balance_ctl, NULL); |
9555c6c1 | 2866 | } |
59641015 ID |
2867 | |
2868 | mutex_unlock(&fs_info->balance_mutex); | |
2869 | mutex_unlock(&fs_info->volume_mutex); | |
2b6ba629 | 2870 | |
59641015 ID |
2871 | return ret; |
2872 | } | |
2873 | ||
2b6ba629 ID |
2874 | int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info) |
2875 | { | |
2876 | struct task_struct *tsk; | |
2877 | ||
2878 | spin_lock(&fs_info->balance_lock); | |
2879 | if (!fs_info->balance_ctl) { | |
2880 | spin_unlock(&fs_info->balance_lock); | |
2881 | return 0; | |
2882 | } | |
2883 | spin_unlock(&fs_info->balance_lock); | |
2884 | ||
2885 | if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) { | |
2886 | printk(KERN_INFO "btrfs: force skipping balance\n"); | |
2887 | return 0; | |
2888 | } | |
2889 | ||
2890 | tsk = kthread_run(balance_kthread, fs_info, "btrfs-balance"); | |
2891 | if (IS_ERR(tsk)) | |
2892 | return PTR_ERR(tsk); | |
2893 | ||
2894 | return 0; | |
2895 | } | |
2896 | ||
68310a5e | 2897 | int btrfs_recover_balance(struct btrfs_fs_info *fs_info) |
59641015 | 2898 | { |
59641015 ID |
2899 | struct btrfs_balance_control *bctl; |
2900 | struct btrfs_balance_item *item; | |
2901 | struct btrfs_disk_balance_args disk_bargs; | |
2902 | struct btrfs_path *path; | |
2903 | struct extent_buffer *leaf; | |
2904 | struct btrfs_key key; | |
2905 | int ret; | |
2906 | ||
2907 | path = btrfs_alloc_path(); | |
2908 | if (!path) | |
2909 | return -ENOMEM; | |
2910 | ||
59641015 ID |
2911 | key.objectid = BTRFS_BALANCE_OBJECTID; |
2912 | key.type = BTRFS_BALANCE_ITEM_KEY; | |
2913 | key.offset = 0; | |
2914 | ||
68310a5e | 2915 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
59641015 | 2916 | if (ret < 0) |
68310a5e | 2917 | goto out; |
59641015 ID |
2918 | if (ret > 0) { /* ret = -ENOENT; */ |
2919 | ret = 0; | |
68310a5e ID |
2920 | goto out; |
2921 | } | |
2922 | ||
2923 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); | |
2924 | if (!bctl) { | |
2925 | ret = -ENOMEM; | |
2926 | goto out; | |
59641015 ID |
2927 | } |
2928 | ||
2929 | leaf = path->nodes[0]; | |
2930 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item); | |
2931 | ||
68310a5e ID |
2932 | bctl->fs_info = fs_info; |
2933 | bctl->flags = btrfs_balance_flags(leaf, item); | |
2934 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
59641015 ID |
2935 | |
2936 | btrfs_balance_data(leaf, item, &disk_bargs); | |
2937 | btrfs_disk_balance_args_to_cpu(&bctl->data, &disk_bargs); | |
2938 | btrfs_balance_meta(leaf, item, &disk_bargs); | |
2939 | btrfs_disk_balance_args_to_cpu(&bctl->meta, &disk_bargs); | |
2940 | btrfs_balance_sys(leaf, item, &disk_bargs); | |
2941 | btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs); | |
2942 | ||
68310a5e ID |
2943 | mutex_lock(&fs_info->volume_mutex); |
2944 | mutex_lock(&fs_info->balance_mutex); | |
59641015 | 2945 | |
68310a5e ID |
2946 | set_balance_control(bctl); |
2947 | ||
2948 | mutex_unlock(&fs_info->balance_mutex); | |
2949 | mutex_unlock(&fs_info->volume_mutex); | |
59641015 ID |
2950 | out: |
2951 | btrfs_free_path(path); | |
ec44a35c CM |
2952 | return ret; |
2953 | } | |
2954 | ||
837d5b6e ID |
2955 | int btrfs_pause_balance(struct btrfs_fs_info *fs_info) |
2956 | { | |
2957 | int ret = 0; | |
2958 | ||
2959 | mutex_lock(&fs_info->balance_mutex); | |
2960 | if (!fs_info->balance_ctl) { | |
2961 | mutex_unlock(&fs_info->balance_mutex); | |
2962 | return -ENOTCONN; | |
2963 | } | |
2964 | ||
2965 | if (atomic_read(&fs_info->balance_running)) { | |
2966 | atomic_inc(&fs_info->balance_pause_req); | |
2967 | mutex_unlock(&fs_info->balance_mutex); | |
2968 | ||
2969 | wait_event(fs_info->balance_wait_q, | |
2970 | atomic_read(&fs_info->balance_running) == 0); | |
2971 | ||
2972 | mutex_lock(&fs_info->balance_mutex); | |
2973 | /* we are good with balance_ctl ripped off from under us */ | |
2974 | BUG_ON(atomic_read(&fs_info->balance_running)); | |
2975 | atomic_dec(&fs_info->balance_pause_req); | |
2976 | } else { | |
2977 | ret = -ENOTCONN; | |
2978 | } | |
2979 | ||
2980 | mutex_unlock(&fs_info->balance_mutex); | |
2981 | return ret; | |
2982 | } | |
2983 | ||
a7e99c69 ID |
2984 | int btrfs_cancel_balance(struct btrfs_fs_info *fs_info) |
2985 | { | |
2986 | mutex_lock(&fs_info->balance_mutex); | |
2987 | if (!fs_info->balance_ctl) { | |
2988 | mutex_unlock(&fs_info->balance_mutex); | |
2989 | return -ENOTCONN; | |
2990 | } | |
2991 | ||
2992 | atomic_inc(&fs_info->balance_cancel_req); | |
2993 | /* | |
2994 | * if we are running just wait and return, balance item is | |
2995 | * deleted in btrfs_balance in this case | |
2996 | */ | |
2997 | if (atomic_read(&fs_info->balance_running)) { | |
2998 | mutex_unlock(&fs_info->balance_mutex); | |
2999 | wait_event(fs_info->balance_wait_q, | |
3000 | atomic_read(&fs_info->balance_running) == 0); | |
3001 | mutex_lock(&fs_info->balance_mutex); | |
3002 | } else { | |
3003 | /* __cancel_balance needs volume_mutex */ | |
3004 | mutex_unlock(&fs_info->balance_mutex); | |
3005 | mutex_lock(&fs_info->volume_mutex); | |
3006 | mutex_lock(&fs_info->balance_mutex); | |
3007 | ||
3008 | if (fs_info->balance_ctl) | |
3009 | __cancel_balance(fs_info); | |
3010 | ||
3011 | mutex_unlock(&fs_info->volume_mutex); | |
3012 | } | |
3013 | ||
3014 | BUG_ON(fs_info->balance_ctl || atomic_read(&fs_info->balance_running)); | |
3015 | atomic_dec(&fs_info->balance_cancel_req); | |
3016 | mutex_unlock(&fs_info->balance_mutex); | |
3017 | return 0; | |
3018 | } | |
3019 | ||
8f18cf13 CM |
3020 | /* |
3021 | * shrinking a device means finding all of the device extents past | |
3022 | * the new size, and then following the back refs to the chunks. | |
3023 | * The chunk relocation code actually frees the device extent | |
3024 | */ | |
3025 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size) | |
3026 | { | |
3027 | struct btrfs_trans_handle *trans; | |
3028 | struct btrfs_root *root = device->dev_root; | |
3029 | struct btrfs_dev_extent *dev_extent = NULL; | |
3030 | struct btrfs_path *path; | |
3031 | u64 length; | |
3032 | u64 chunk_tree; | |
3033 | u64 chunk_objectid; | |
3034 | u64 chunk_offset; | |
3035 | int ret; | |
3036 | int slot; | |
ba1bf481 JB |
3037 | int failed = 0; |
3038 | bool retried = false; | |
8f18cf13 CM |
3039 | struct extent_buffer *l; |
3040 | struct btrfs_key key; | |
6c41761f | 3041 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
8f18cf13 | 3042 | u64 old_total = btrfs_super_total_bytes(super_copy); |
ba1bf481 | 3043 | u64 old_size = device->total_bytes; |
8f18cf13 CM |
3044 | u64 diff = device->total_bytes - new_size; |
3045 | ||
2b82032c YZ |
3046 | if (new_size >= device->total_bytes) |
3047 | return -EINVAL; | |
8f18cf13 CM |
3048 | |
3049 | path = btrfs_alloc_path(); | |
3050 | if (!path) | |
3051 | return -ENOMEM; | |
3052 | ||
8f18cf13 CM |
3053 | path->reada = 2; |
3054 | ||
7d9eb12c CM |
3055 | lock_chunks(root); |
3056 | ||
8f18cf13 | 3057 | device->total_bytes = new_size; |
2bf64758 | 3058 | if (device->writeable) { |
2b82032c | 3059 | device->fs_devices->total_rw_bytes -= diff; |
2bf64758 JB |
3060 | spin_lock(&root->fs_info->free_chunk_lock); |
3061 | root->fs_info->free_chunk_space -= diff; | |
3062 | spin_unlock(&root->fs_info->free_chunk_lock); | |
3063 | } | |
7d9eb12c | 3064 | unlock_chunks(root); |
8f18cf13 | 3065 | |
ba1bf481 | 3066 | again: |
8f18cf13 CM |
3067 | key.objectid = device->devid; |
3068 | key.offset = (u64)-1; | |
3069 | key.type = BTRFS_DEV_EXTENT_KEY; | |
3070 | ||
213e64da | 3071 | do { |
8f18cf13 CM |
3072 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
3073 | if (ret < 0) | |
3074 | goto done; | |
3075 | ||
3076 | ret = btrfs_previous_item(root, path, 0, key.type); | |
3077 | if (ret < 0) | |
3078 | goto done; | |
3079 | if (ret) { | |
3080 | ret = 0; | |
b3b4aa74 | 3081 | btrfs_release_path(path); |
bf1fb512 | 3082 | break; |
8f18cf13 CM |
3083 | } |
3084 | ||
3085 | l = path->nodes[0]; | |
3086 | slot = path->slots[0]; | |
3087 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); | |
3088 | ||
ba1bf481 | 3089 | if (key.objectid != device->devid) { |
b3b4aa74 | 3090 | btrfs_release_path(path); |
bf1fb512 | 3091 | break; |
ba1bf481 | 3092 | } |
8f18cf13 CM |
3093 | |
3094 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); | |
3095 | length = btrfs_dev_extent_length(l, dev_extent); | |
3096 | ||
ba1bf481 | 3097 | if (key.offset + length <= new_size) { |
b3b4aa74 | 3098 | btrfs_release_path(path); |
d6397bae | 3099 | break; |
ba1bf481 | 3100 | } |
8f18cf13 CM |
3101 | |
3102 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); | |
3103 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); | |
3104 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); | |
b3b4aa74 | 3105 | btrfs_release_path(path); |
8f18cf13 CM |
3106 | |
3107 | ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid, | |
3108 | chunk_offset); | |
ba1bf481 | 3109 | if (ret && ret != -ENOSPC) |
8f18cf13 | 3110 | goto done; |
ba1bf481 JB |
3111 | if (ret == -ENOSPC) |
3112 | failed++; | |
213e64da | 3113 | } while (key.offset-- > 0); |
ba1bf481 JB |
3114 | |
3115 | if (failed && !retried) { | |
3116 | failed = 0; | |
3117 | retried = true; | |
3118 | goto again; | |
3119 | } else if (failed && retried) { | |
3120 | ret = -ENOSPC; | |
3121 | lock_chunks(root); | |
3122 | ||
3123 | device->total_bytes = old_size; | |
3124 | if (device->writeable) | |
3125 | device->fs_devices->total_rw_bytes += diff; | |
2bf64758 JB |
3126 | spin_lock(&root->fs_info->free_chunk_lock); |
3127 | root->fs_info->free_chunk_space += diff; | |
3128 | spin_unlock(&root->fs_info->free_chunk_lock); | |
ba1bf481 JB |
3129 | unlock_chunks(root); |
3130 | goto done; | |
8f18cf13 CM |
3131 | } |
3132 | ||
d6397bae | 3133 | /* Shrinking succeeded, else we would be at "done". */ |
a22285a6 | 3134 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
3135 | if (IS_ERR(trans)) { |
3136 | ret = PTR_ERR(trans); | |
3137 | goto done; | |
3138 | } | |
3139 | ||
d6397bae CB |
3140 | lock_chunks(root); |
3141 | ||
3142 | device->disk_total_bytes = new_size; | |
3143 | /* Now btrfs_update_device() will change the on-disk size. */ | |
3144 | ret = btrfs_update_device(trans, device); | |
3145 | if (ret) { | |
3146 | unlock_chunks(root); | |
3147 | btrfs_end_transaction(trans, root); | |
3148 | goto done; | |
3149 | } | |
3150 | WARN_ON(diff > old_total); | |
3151 | btrfs_set_super_total_bytes(super_copy, old_total - diff); | |
3152 | unlock_chunks(root); | |
3153 | btrfs_end_transaction(trans, root); | |
8f18cf13 CM |
3154 | done: |
3155 | btrfs_free_path(path); | |
3156 | return ret; | |
3157 | } | |
3158 | ||
125ccb0a | 3159 | static int btrfs_add_system_chunk(struct btrfs_root *root, |
0b86a832 CM |
3160 | struct btrfs_key *key, |
3161 | struct btrfs_chunk *chunk, int item_size) | |
3162 | { | |
6c41761f | 3163 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
0b86a832 CM |
3164 | struct btrfs_disk_key disk_key; |
3165 | u32 array_size; | |
3166 | u8 *ptr; | |
3167 | ||
3168 | array_size = btrfs_super_sys_array_size(super_copy); | |
3169 | if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) | |
3170 | return -EFBIG; | |
3171 | ||
3172 | ptr = super_copy->sys_chunk_array + array_size; | |
3173 | btrfs_cpu_key_to_disk(&disk_key, key); | |
3174 | memcpy(ptr, &disk_key, sizeof(disk_key)); | |
3175 | ptr += sizeof(disk_key); | |
3176 | memcpy(ptr, chunk, item_size); | |
3177 | item_size += sizeof(disk_key); | |
3178 | btrfs_set_super_sys_array_size(super_copy, array_size + item_size); | |
3179 | return 0; | |
3180 | } | |
3181 | ||
73c5de00 AJ |
3182 | /* |
3183 | * sort the devices in descending order by max_avail, total_avail | |
3184 | */ | |
3185 | static int btrfs_cmp_device_info(const void *a, const void *b) | |
9b3f68b9 | 3186 | { |
73c5de00 AJ |
3187 | const struct btrfs_device_info *di_a = a; |
3188 | const struct btrfs_device_info *di_b = b; | |
9b3f68b9 | 3189 | |
73c5de00 | 3190 | if (di_a->max_avail > di_b->max_avail) |
b2117a39 | 3191 | return -1; |
73c5de00 | 3192 | if (di_a->max_avail < di_b->max_avail) |
b2117a39 | 3193 | return 1; |
73c5de00 AJ |
3194 | if (di_a->total_avail > di_b->total_avail) |
3195 | return -1; | |
3196 | if (di_a->total_avail < di_b->total_avail) | |
3197 | return 1; | |
3198 | return 0; | |
b2117a39 | 3199 | } |
0b86a832 | 3200 | |
73c5de00 AJ |
3201 | static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
3202 | struct btrfs_root *extent_root, | |
3203 | struct map_lookup **map_ret, | |
3204 | u64 *num_bytes_out, u64 *stripe_size_out, | |
3205 | u64 start, u64 type) | |
b2117a39 | 3206 | { |
73c5de00 AJ |
3207 | struct btrfs_fs_info *info = extent_root->fs_info; |
3208 | struct btrfs_fs_devices *fs_devices = info->fs_devices; | |
3209 | struct list_head *cur; | |
3210 | struct map_lookup *map = NULL; | |
3211 | struct extent_map_tree *em_tree; | |
3212 | struct extent_map *em; | |
3213 | struct btrfs_device_info *devices_info = NULL; | |
3214 | u64 total_avail; | |
3215 | int num_stripes; /* total number of stripes to allocate */ | |
3216 | int sub_stripes; /* sub_stripes info for map */ | |
3217 | int dev_stripes; /* stripes per dev */ | |
3218 | int devs_max; /* max devs to use */ | |
3219 | int devs_min; /* min devs needed */ | |
3220 | int devs_increment; /* ndevs has to be a multiple of this */ | |
3221 | int ncopies; /* how many copies to data has */ | |
3222 | int ret; | |
3223 | u64 max_stripe_size; | |
3224 | u64 max_chunk_size; | |
3225 | u64 stripe_size; | |
3226 | u64 num_bytes; | |
3227 | int ndevs; | |
3228 | int i; | |
3229 | int j; | |
593060d7 | 3230 | |
0c460c0d | 3231 | BUG_ON(!alloc_profile_is_valid(type, 0)); |
9b3f68b9 | 3232 | |
73c5de00 AJ |
3233 | if (list_empty(&fs_devices->alloc_list)) |
3234 | return -ENOSPC; | |
b2117a39 | 3235 | |
73c5de00 AJ |
3236 | sub_stripes = 1; |
3237 | dev_stripes = 1; | |
3238 | devs_increment = 1; | |
3239 | ncopies = 1; | |
3240 | devs_max = 0; /* 0 == as many as possible */ | |
3241 | devs_min = 1; | |
3242 | ||
3243 | /* | |
3244 | * define the properties of each RAID type. | |
3245 | * FIXME: move this to a global table and use it in all RAID | |
3246 | * calculation code | |
3247 | */ | |
3248 | if (type & (BTRFS_BLOCK_GROUP_DUP)) { | |
3249 | dev_stripes = 2; | |
b2117a39 | 3250 | ncopies = 2; |
73c5de00 AJ |
3251 | devs_max = 1; |
3252 | } else if (type & (BTRFS_BLOCK_GROUP_RAID0)) { | |
3253 | devs_min = 2; | |
3254 | } else if (type & (BTRFS_BLOCK_GROUP_RAID1)) { | |
3255 | devs_increment = 2; | |
b2117a39 | 3256 | ncopies = 2; |
73c5de00 AJ |
3257 | devs_max = 2; |
3258 | devs_min = 2; | |
3259 | } else if (type & (BTRFS_BLOCK_GROUP_RAID10)) { | |
3260 | sub_stripes = 2; | |
3261 | devs_increment = 2; | |
3262 | ncopies = 2; | |
3263 | devs_min = 4; | |
3264 | } else { | |
3265 | devs_max = 1; | |
3266 | } | |
b2117a39 | 3267 | |
9b3f68b9 | 3268 | if (type & BTRFS_BLOCK_GROUP_DATA) { |
73c5de00 AJ |
3269 | max_stripe_size = 1024 * 1024 * 1024; |
3270 | max_chunk_size = 10 * max_stripe_size; | |
9b3f68b9 | 3271 | } else if (type & BTRFS_BLOCK_GROUP_METADATA) { |
1100373f CM |
3272 | /* for larger filesystems, use larger metadata chunks */ |
3273 | if (fs_devices->total_rw_bytes > 50ULL * 1024 * 1024 * 1024) | |
3274 | max_stripe_size = 1024 * 1024 * 1024; | |
3275 | else | |
3276 | max_stripe_size = 256 * 1024 * 1024; | |
73c5de00 | 3277 | max_chunk_size = max_stripe_size; |
a40a90a0 | 3278 | } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { |
96bdc7dc | 3279 | max_stripe_size = 32 * 1024 * 1024; |
73c5de00 AJ |
3280 | max_chunk_size = 2 * max_stripe_size; |
3281 | } else { | |
3282 | printk(KERN_ERR "btrfs: invalid chunk type 0x%llx requested\n", | |
3283 | type); | |
3284 | BUG_ON(1); | |
9b3f68b9 CM |
3285 | } |
3286 | ||
2b82032c YZ |
3287 | /* we don't want a chunk larger than 10% of writeable space */ |
3288 | max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1), | |
3289 | max_chunk_size); | |
9b3f68b9 | 3290 | |
73c5de00 AJ |
3291 | devices_info = kzalloc(sizeof(*devices_info) * fs_devices->rw_devices, |
3292 | GFP_NOFS); | |
3293 | if (!devices_info) | |
3294 | return -ENOMEM; | |
0cad8a11 | 3295 | |
73c5de00 | 3296 | cur = fs_devices->alloc_list.next; |
9b3f68b9 | 3297 | |
9f680ce0 | 3298 | /* |
73c5de00 AJ |
3299 | * in the first pass through the devices list, we gather information |
3300 | * about the available holes on each device. | |
9f680ce0 | 3301 | */ |
73c5de00 AJ |
3302 | ndevs = 0; |
3303 | while (cur != &fs_devices->alloc_list) { | |
3304 | struct btrfs_device *device; | |
3305 | u64 max_avail; | |
3306 | u64 dev_offset; | |
b2117a39 | 3307 | |
73c5de00 | 3308 | device = list_entry(cur, struct btrfs_device, dev_alloc_list); |
9f680ce0 | 3309 | |
73c5de00 | 3310 | cur = cur->next; |
b2117a39 | 3311 | |
73c5de00 AJ |
3312 | if (!device->writeable) { |
3313 | printk(KERN_ERR | |
3314 | "btrfs: read-only device in alloc_list\n"); | |
3315 | WARN_ON(1); | |
3316 | continue; | |
3317 | } | |
b2117a39 | 3318 | |
73c5de00 AJ |
3319 | if (!device->in_fs_metadata) |
3320 | continue; | |
b2117a39 | 3321 | |
73c5de00 AJ |
3322 | if (device->total_bytes > device->bytes_used) |
3323 | total_avail = device->total_bytes - device->bytes_used; | |
3324 | else | |
3325 | total_avail = 0; | |
38c01b96 | 3326 | |
3327 | /* If there is no space on this device, skip it. */ | |
3328 | if (total_avail == 0) | |
3329 | continue; | |
b2117a39 | 3330 | |
125ccb0a | 3331 | ret = find_free_dev_extent(device, |
73c5de00 AJ |
3332 | max_stripe_size * dev_stripes, |
3333 | &dev_offset, &max_avail); | |
3334 | if (ret && ret != -ENOSPC) | |
3335 | goto error; | |
b2117a39 | 3336 | |
73c5de00 AJ |
3337 | if (ret == 0) |
3338 | max_avail = max_stripe_size * dev_stripes; | |
b2117a39 | 3339 | |
73c5de00 AJ |
3340 | if (max_avail < BTRFS_STRIPE_LEN * dev_stripes) |
3341 | continue; | |
b2117a39 | 3342 | |
73c5de00 AJ |
3343 | devices_info[ndevs].dev_offset = dev_offset; |
3344 | devices_info[ndevs].max_avail = max_avail; | |
3345 | devices_info[ndevs].total_avail = total_avail; | |
3346 | devices_info[ndevs].dev = device; | |
3347 | ++ndevs; | |
3348 | } | |
b2117a39 | 3349 | |
73c5de00 AJ |
3350 | /* |
3351 | * now sort the devices by hole size / available space | |
3352 | */ | |
3353 | sort(devices_info, ndevs, sizeof(struct btrfs_device_info), | |
3354 | btrfs_cmp_device_info, NULL); | |
b2117a39 | 3355 | |
73c5de00 AJ |
3356 | /* round down to number of usable stripes */ |
3357 | ndevs -= ndevs % devs_increment; | |
b2117a39 | 3358 | |
73c5de00 AJ |
3359 | if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) { |
3360 | ret = -ENOSPC; | |
3361 | goto error; | |
b2117a39 | 3362 | } |
9f680ce0 | 3363 | |
73c5de00 AJ |
3364 | if (devs_max && ndevs > devs_max) |
3365 | ndevs = devs_max; | |
3366 | /* | |
3367 | * the primary goal is to maximize the number of stripes, so use as many | |
3368 | * devices as possible, even if the stripes are not maximum sized. | |
3369 | */ | |
3370 | stripe_size = devices_info[ndevs-1].max_avail; | |
3371 | num_stripes = ndevs * dev_stripes; | |
b2117a39 | 3372 | |
37db63a4 | 3373 | if (stripe_size * ndevs > max_chunk_size * ncopies) { |
73c5de00 | 3374 | stripe_size = max_chunk_size * ncopies; |
37db63a4 | 3375 | do_div(stripe_size, ndevs); |
b2117a39 | 3376 | } |
b2117a39 | 3377 | |
73c5de00 | 3378 | do_div(stripe_size, dev_stripes); |
37db63a4 ID |
3379 | |
3380 | /* align to BTRFS_STRIPE_LEN */ | |
73c5de00 AJ |
3381 | do_div(stripe_size, BTRFS_STRIPE_LEN); |
3382 | stripe_size *= BTRFS_STRIPE_LEN; | |
b2117a39 MX |
3383 | |
3384 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
3385 | if (!map) { | |
3386 | ret = -ENOMEM; | |
3387 | goto error; | |
3388 | } | |
3389 | map->num_stripes = num_stripes; | |
9b3f68b9 | 3390 | |
73c5de00 AJ |
3391 | for (i = 0; i < ndevs; ++i) { |
3392 | for (j = 0; j < dev_stripes; ++j) { | |
3393 | int s = i * dev_stripes + j; | |
3394 | map->stripes[s].dev = devices_info[i].dev; | |
3395 | map->stripes[s].physical = devices_info[i].dev_offset + | |
3396 | j * stripe_size; | |
6324fbf3 | 3397 | } |
6324fbf3 | 3398 | } |
2b82032c | 3399 | map->sector_size = extent_root->sectorsize; |
b2117a39 MX |
3400 | map->stripe_len = BTRFS_STRIPE_LEN; |
3401 | map->io_align = BTRFS_STRIPE_LEN; | |
3402 | map->io_width = BTRFS_STRIPE_LEN; | |
2b82032c | 3403 | map->type = type; |
2b82032c | 3404 | map->sub_stripes = sub_stripes; |
0b86a832 | 3405 | |
2b82032c | 3406 | *map_ret = map; |
73c5de00 | 3407 | num_bytes = stripe_size * (num_stripes / ncopies); |
0b86a832 | 3408 | |
73c5de00 AJ |
3409 | *stripe_size_out = stripe_size; |
3410 | *num_bytes_out = num_bytes; | |
0b86a832 | 3411 | |
73c5de00 | 3412 | trace_btrfs_chunk_alloc(info->chunk_root, map, start, num_bytes); |
1abe9b8a | 3413 | |
172ddd60 | 3414 | em = alloc_extent_map(); |
2b82032c | 3415 | if (!em) { |
b2117a39 MX |
3416 | ret = -ENOMEM; |
3417 | goto error; | |
593060d7 | 3418 | } |
2b82032c YZ |
3419 | em->bdev = (struct block_device *)map; |
3420 | em->start = start; | |
73c5de00 | 3421 | em->len = num_bytes; |
2b82032c YZ |
3422 | em->block_start = 0; |
3423 | em->block_len = em->len; | |
593060d7 | 3424 | |
2b82032c | 3425 | em_tree = &extent_root->fs_info->mapping_tree.map_tree; |
890871be | 3426 | write_lock(&em_tree->lock); |
2b82032c | 3427 | ret = add_extent_mapping(em_tree, em); |
890871be | 3428 | write_unlock(&em_tree->lock); |
2b82032c | 3429 | free_extent_map(em); |
1dd4602f MF |
3430 | if (ret) |
3431 | goto error; | |
0b86a832 | 3432 | |
2b82032c YZ |
3433 | ret = btrfs_make_block_group(trans, extent_root, 0, type, |
3434 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
73c5de00 | 3435 | start, num_bytes); |
79787eaa JM |
3436 | if (ret) |
3437 | goto error; | |
611f0e00 | 3438 | |
73c5de00 AJ |
3439 | for (i = 0; i < map->num_stripes; ++i) { |
3440 | struct btrfs_device *device; | |
3441 | u64 dev_offset; | |
3442 | ||
3443 | device = map->stripes[i].dev; | |
3444 | dev_offset = map->stripes[i].physical; | |
0b86a832 CM |
3445 | |
3446 | ret = btrfs_alloc_dev_extent(trans, device, | |
2b82032c YZ |
3447 | info->chunk_root->root_key.objectid, |
3448 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
73c5de00 | 3449 | start, dev_offset, stripe_size); |
79787eaa JM |
3450 | if (ret) { |
3451 | btrfs_abort_transaction(trans, extent_root, ret); | |
3452 | goto error; | |
3453 | } | |
2b82032c YZ |
3454 | } |
3455 | ||
b2117a39 | 3456 | kfree(devices_info); |
2b82032c | 3457 | return 0; |
b2117a39 MX |
3458 | |
3459 | error: | |
3460 | kfree(map); | |
3461 | kfree(devices_info); | |
3462 | return ret; | |
2b82032c YZ |
3463 | } |
3464 | ||
3465 | static int __finish_chunk_alloc(struct btrfs_trans_handle *trans, | |
3466 | struct btrfs_root *extent_root, | |
3467 | struct map_lookup *map, u64 chunk_offset, | |
3468 | u64 chunk_size, u64 stripe_size) | |
3469 | { | |
3470 | u64 dev_offset; | |
3471 | struct btrfs_key key; | |
3472 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
3473 | struct btrfs_device *device; | |
3474 | struct btrfs_chunk *chunk; | |
3475 | struct btrfs_stripe *stripe; | |
3476 | size_t item_size = btrfs_chunk_item_size(map->num_stripes); | |
3477 | int index = 0; | |
3478 | int ret; | |
3479 | ||
3480 | chunk = kzalloc(item_size, GFP_NOFS); | |
3481 | if (!chunk) | |
3482 | return -ENOMEM; | |
3483 | ||
3484 | index = 0; | |
3485 | while (index < map->num_stripes) { | |
3486 | device = map->stripes[index].dev; | |
3487 | device->bytes_used += stripe_size; | |
0b86a832 | 3488 | ret = btrfs_update_device(trans, device); |
3acd3953 MF |
3489 | if (ret) |
3490 | goto out_free; | |
2b82032c YZ |
3491 | index++; |
3492 | } | |
3493 | ||
2bf64758 JB |
3494 | spin_lock(&extent_root->fs_info->free_chunk_lock); |
3495 | extent_root->fs_info->free_chunk_space -= (stripe_size * | |
3496 | map->num_stripes); | |
3497 | spin_unlock(&extent_root->fs_info->free_chunk_lock); | |
3498 | ||
2b82032c YZ |
3499 | index = 0; |
3500 | stripe = &chunk->stripe; | |
3501 | while (index < map->num_stripes) { | |
3502 | device = map->stripes[index].dev; | |
3503 | dev_offset = map->stripes[index].physical; | |
0b86a832 | 3504 | |
e17cade2 CM |
3505 | btrfs_set_stack_stripe_devid(stripe, device->devid); |
3506 | btrfs_set_stack_stripe_offset(stripe, dev_offset); | |
3507 | memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 3508 | stripe++; |
0b86a832 CM |
3509 | index++; |
3510 | } | |
3511 | ||
2b82032c | 3512 | btrfs_set_stack_chunk_length(chunk, chunk_size); |
0b86a832 | 3513 | btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid); |
2b82032c YZ |
3514 | btrfs_set_stack_chunk_stripe_len(chunk, map->stripe_len); |
3515 | btrfs_set_stack_chunk_type(chunk, map->type); | |
3516 | btrfs_set_stack_chunk_num_stripes(chunk, map->num_stripes); | |
3517 | btrfs_set_stack_chunk_io_align(chunk, map->stripe_len); | |
3518 | btrfs_set_stack_chunk_io_width(chunk, map->stripe_len); | |
0b86a832 | 3519 | btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize); |
2b82032c | 3520 | btrfs_set_stack_chunk_sub_stripes(chunk, map->sub_stripes); |
0b86a832 | 3521 | |
2b82032c YZ |
3522 | key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
3523 | key.type = BTRFS_CHUNK_ITEM_KEY; | |
3524 | key.offset = chunk_offset; | |
0b86a832 | 3525 | |
2b82032c | 3526 | ret = btrfs_insert_item(trans, chunk_root, &key, chunk, item_size); |
0b86a832 | 3527 | |
4ed1d16e MF |
3528 | if (ret == 0 && map->type & BTRFS_BLOCK_GROUP_SYSTEM) { |
3529 | /* | |
3530 | * TODO: Cleanup of inserted chunk root in case of | |
3531 | * failure. | |
3532 | */ | |
125ccb0a | 3533 | ret = btrfs_add_system_chunk(chunk_root, &key, chunk, |
2b82032c | 3534 | item_size); |
8f18cf13 | 3535 | } |
1abe9b8a | 3536 | |
3acd3953 | 3537 | out_free: |
0b86a832 | 3538 | kfree(chunk); |
4ed1d16e | 3539 | return ret; |
2b82032c | 3540 | } |
0b86a832 | 3541 | |
2b82032c YZ |
3542 | /* |
3543 | * Chunk allocation falls into two parts. The first part does works | |
3544 | * that make the new allocated chunk useable, but not do any operation | |
3545 | * that modifies the chunk tree. The second part does the works that | |
3546 | * require modifying the chunk tree. This division is important for the | |
3547 | * bootstrap process of adding storage to a seed btrfs. | |
3548 | */ | |
3549 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
3550 | struct btrfs_root *extent_root, u64 type) | |
3551 | { | |
3552 | u64 chunk_offset; | |
3553 | u64 chunk_size; | |
3554 | u64 stripe_size; | |
3555 | struct map_lookup *map; | |
3556 | struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root; | |
3557 | int ret; | |
3558 | ||
3559 | ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, | |
3560 | &chunk_offset); | |
3561 | if (ret) | |
3562 | return ret; | |
3563 | ||
3564 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
3565 | &stripe_size, chunk_offset, type); | |
3566 | if (ret) | |
3567 | return ret; | |
3568 | ||
3569 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
3570 | chunk_size, stripe_size); | |
79787eaa JM |
3571 | if (ret) |
3572 | return ret; | |
2b82032c YZ |
3573 | return 0; |
3574 | } | |
3575 | ||
d397712b | 3576 | static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, |
2b82032c YZ |
3577 | struct btrfs_root *root, |
3578 | struct btrfs_device *device) | |
3579 | { | |
3580 | u64 chunk_offset; | |
3581 | u64 sys_chunk_offset; | |
3582 | u64 chunk_size; | |
3583 | u64 sys_chunk_size; | |
3584 | u64 stripe_size; | |
3585 | u64 sys_stripe_size; | |
3586 | u64 alloc_profile; | |
3587 | struct map_lookup *map; | |
3588 | struct map_lookup *sys_map; | |
3589 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3590 | struct btrfs_root *extent_root = fs_info->extent_root; | |
3591 | int ret; | |
3592 | ||
3593 | ret = find_next_chunk(fs_info->chunk_root, | |
3594 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset); | |
92b8e897 MF |
3595 | if (ret) |
3596 | return ret; | |
2b82032c YZ |
3597 | |
3598 | alloc_profile = BTRFS_BLOCK_GROUP_METADATA | | |
6fef8df1 | 3599 | fs_info->avail_metadata_alloc_bits; |
2b82032c YZ |
3600 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); |
3601 | ||
3602 | ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size, | |
3603 | &stripe_size, chunk_offset, alloc_profile); | |
79787eaa JM |
3604 | if (ret) |
3605 | return ret; | |
2b82032c YZ |
3606 | |
3607 | sys_chunk_offset = chunk_offset + chunk_size; | |
3608 | ||
3609 | alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM | | |
6fef8df1 | 3610 | fs_info->avail_system_alloc_bits; |
2b82032c YZ |
3611 | alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile); |
3612 | ||
3613 | ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map, | |
3614 | &sys_chunk_size, &sys_stripe_size, | |
3615 | sys_chunk_offset, alloc_profile); | |
005d6427 DS |
3616 | if (ret) { |
3617 | btrfs_abort_transaction(trans, root, ret); | |
3618 | goto out; | |
3619 | } | |
2b82032c YZ |
3620 | |
3621 | ret = btrfs_add_device(trans, fs_info->chunk_root, device); | |
005d6427 DS |
3622 | if (ret) { |
3623 | btrfs_abort_transaction(trans, root, ret); | |
3624 | goto out; | |
3625 | } | |
2b82032c YZ |
3626 | |
3627 | /* | |
3628 | * Modifying chunk tree needs allocating new blocks from both | |
3629 | * system block group and metadata block group. So we only can | |
3630 | * do operations require modifying the chunk tree after both | |
3631 | * block groups were created. | |
3632 | */ | |
3633 | ret = __finish_chunk_alloc(trans, extent_root, map, chunk_offset, | |
3634 | chunk_size, stripe_size); | |
005d6427 DS |
3635 | if (ret) { |
3636 | btrfs_abort_transaction(trans, root, ret); | |
3637 | goto out; | |
3638 | } | |
2b82032c YZ |
3639 | |
3640 | ret = __finish_chunk_alloc(trans, extent_root, sys_map, | |
3641 | sys_chunk_offset, sys_chunk_size, | |
3642 | sys_stripe_size); | |
79787eaa | 3643 | if (ret) |
005d6427 | 3644 | btrfs_abort_transaction(trans, root, ret); |
79787eaa | 3645 | |
005d6427 | 3646 | out: |
79787eaa | 3647 | |
79787eaa | 3648 | return ret; |
2b82032c YZ |
3649 | } |
3650 | ||
3651 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset) | |
3652 | { | |
3653 | struct extent_map *em; | |
3654 | struct map_lookup *map; | |
3655 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
3656 | int readonly = 0; | |
3657 | int i; | |
3658 | ||
890871be | 3659 | read_lock(&map_tree->map_tree.lock); |
2b82032c | 3660 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
890871be | 3661 | read_unlock(&map_tree->map_tree.lock); |
2b82032c YZ |
3662 | if (!em) |
3663 | return 1; | |
3664 | ||
f48b9075 JB |
3665 | if (btrfs_test_opt(root, DEGRADED)) { |
3666 | free_extent_map(em); | |
3667 | return 0; | |
3668 | } | |
3669 | ||
2b82032c YZ |
3670 | map = (struct map_lookup *)em->bdev; |
3671 | for (i = 0; i < map->num_stripes; i++) { | |
3672 | if (!map->stripes[i].dev->writeable) { | |
3673 | readonly = 1; | |
3674 | break; | |
3675 | } | |
3676 | } | |
0b86a832 | 3677 | free_extent_map(em); |
2b82032c | 3678 | return readonly; |
0b86a832 CM |
3679 | } |
3680 | ||
3681 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree) | |
3682 | { | |
a8067e02 | 3683 | extent_map_tree_init(&tree->map_tree); |
0b86a832 CM |
3684 | } |
3685 | ||
3686 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree) | |
3687 | { | |
3688 | struct extent_map *em; | |
3689 | ||
d397712b | 3690 | while (1) { |
890871be | 3691 | write_lock(&tree->map_tree.lock); |
0b86a832 CM |
3692 | em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1); |
3693 | if (em) | |
3694 | remove_extent_mapping(&tree->map_tree, em); | |
890871be | 3695 | write_unlock(&tree->map_tree.lock); |
0b86a832 CM |
3696 | if (!em) |
3697 | break; | |
3698 | kfree(em->bdev); | |
3699 | /* once for us */ | |
3700 | free_extent_map(em); | |
3701 | /* once for the tree */ | |
3702 | free_extent_map(em); | |
3703 | } | |
3704 | } | |
3705 | ||
f188591e CM |
3706 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len) |
3707 | { | |
3708 | struct extent_map *em; | |
3709 | struct map_lookup *map; | |
3710 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
3711 | int ret; | |
3712 | ||
890871be | 3713 | read_lock(&em_tree->lock); |
f188591e | 3714 | em = lookup_extent_mapping(em_tree, logical, len); |
890871be | 3715 | read_unlock(&em_tree->lock); |
f188591e CM |
3716 | BUG_ON(!em); |
3717 | ||
3718 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
3719 | map = (struct map_lookup *)em->bdev; | |
3720 | if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1)) | |
3721 | ret = map->num_stripes; | |
321aecc6 CM |
3722 | else if (map->type & BTRFS_BLOCK_GROUP_RAID10) |
3723 | ret = map->sub_stripes; | |
f188591e CM |
3724 | else |
3725 | ret = 1; | |
3726 | free_extent_map(em); | |
f188591e CM |
3727 | return ret; |
3728 | } | |
3729 | ||
dfe25020 CM |
3730 | static int find_live_mirror(struct map_lookup *map, int first, int num, |
3731 | int optimal) | |
3732 | { | |
3733 | int i; | |
3734 | if (map->stripes[optimal].dev->bdev) | |
3735 | return optimal; | |
3736 | for (i = first; i < first + num; i++) { | |
3737 | if (map->stripes[i].dev->bdev) | |
3738 | return i; | |
3739 | } | |
3740 | /* we couldn't find one that doesn't fail. Just return something | |
3741 | * and the io error handling code will clean up eventually | |
3742 | */ | |
3743 | return optimal; | |
3744 | } | |
3745 | ||
f2d8d74d CM |
3746 | static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
3747 | u64 logical, u64 *length, | |
a1d3c478 | 3748 | struct btrfs_bio **bbio_ret, |
7eaceacc | 3749 | int mirror_num) |
0b86a832 CM |
3750 | { |
3751 | struct extent_map *em; | |
3752 | struct map_lookup *map; | |
3753 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
3754 | u64 offset; | |
593060d7 | 3755 | u64 stripe_offset; |
fce3bb9a | 3756 | u64 stripe_end_offset; |
593060d7 | 3757 | u64 stripe_nr; |
fce3bb9a LD |
3758 | u64 stripe_nr_orig; |
3759 | u64 stripe_nr_end; | |
593060d7 | 3760 | int stripe_index; |
cea9e445 | 3761 | int i; |
de11cc12 | 3762 | int ret = 0; |
f2d8d74d | 3763 | int num_stripes; |
a236aed1 | 3764 | int max_errors = 0; |
a1d3c478 | 3765 | struct btrfs_bio *bbio = NULL; |
0b86a832 | 3766 | |
890871be | 3767 | read_lock(&em_tree->lock); |
0b86a832 | 3768 | em = lookup_extent_mapping(em_tree, logical, *length); |
890871be | 3769 | read_unlock(&em_tree->lock); |
f2d8d74d | 3770 | |
3b951516 | 3771 | if (!em) { |
48940662 | 3772 | printk(KERN_CRIT "btrfs: unable to find logical %llu len %llu\n", |
d397712b CM |
3773 | (unsigned long long)logical, |
3774 | (unsigned long long)*length); | |
f2d8d74d | 3775 | BUG(); |
3b951516 | 3776 | } |
0b86a832 CM |
3777 | |
3778 | BUG_ON(em->start > logical || em->start + em->len < logical); | |
3779 | map = (struct map_lookup *)em->bdev; | |
3780 | offset = logical - em->start; | |
593060d7 | 3781 | |
f188591e CM |
3782 | if (mirror_num > map->num_stripes) |
3783 | mirror_num = 0; | |
3784 | ||
593060d7 CM |
3785 | stripe_nr = offset; |
3786 | /* | |
3787 | * stripe_nr counts the total number of stripes we have to stride | |
3788 | * to get to this block | |
3789 | */ | |
3790 | do_div(stripe_nr, map->stripe_len); | |
3791 | ||
3792 | stripe_offset = stripe_nr * map->stripe_len; | |
3793 | BUG_ON(offset < stripe_offset); | |
3794 | ||
3795 | /* stripe_offset is the offset of this block in its stripe*/ | |
3796 | stripe_offset = offset - stripe_offset; | |
3797 | ||
fce3bb9a LD |
3798 | if (rw & REQ_DISCARD) |
3799 | *length = min_t(u64, em->len - offset, *length); | |
52ba6929 | 3800 | else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) { |
cea9e445 CM |
3801 | /* we limit the length of each bio to what fits in a stripe */ |
3802 | *length = min_t(u64, em->len - offset, | |
fce3bb9a | 3803 | map->stripe_len - stripe_offset); |
cea9e445 CM |
3804 | } else { |
3805 | *length = em->len - offset; | |
3806 | } | |
f2d8d74d | 3807 | |
a1d3c478 | 3808 | if (!bbio_ret) |
cea9e445 CM |
3809 | goto out; |
3810 | ||
f2d8d74d | 3811 | num_stripes = 1; |
cea9e445 | 3812 | stripe_index = 0; |
fce3bb9a LD |
3813 | stripe_nr_orig = stripe_nr; |
3814 | stripe_nr_end = (offset + *length + map->stripe_len - 1) & | |
3815 | (~(map->stripe_len - 1)); | |
3816 | do_div(stripe_nr_end, map->stripe_len); | |
3817 | stripe_end_offset = stripe_nr_end * map->stripe_len - | |
3818 | (offset + *length); | |
3819 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
3820 | if (rw & REQ_DISCARD) | |
3821 | num_stripes = min_t(u64, map->num_stripes, | |
3822 | stripe_nr_end - stripe_nr_orig); | |
3823 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
3824 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { | |
212a17ab | 3825 | if (rw & (REQ_WRITE | REQ_DISCARD)) |
f2d8d74d | 3826 | num_stripes = map->num_stripes; |
2fff734f | 3827 | else if (mirror_num) |
f188591e | 3828 | stripe_index = mirror_num - 1; |
dfe25020 CM |
3829 | else { |
3830 | stripe_index = find_live_mirror(map, 0, | |
3831 | map->num_stripes, | |
3832 | current->pid % map->num_stripes); | |
a1d3c478 | 3833 | mirror_num = stripe_index + 1; |
dfe25020 | 3834 | } |
2fff734f | 3835 | |
611f0e00 | 3836 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
a1d3c478 | 3837 | if (rw & (REQ_WRITE | REQ_DISCARD)) { |
f2d8d74d | 3838 | num_stripes = map->num_stripes; |
a1d3c478 | 3839 | } else if (mirror_num) { |
f188591e | 3840 | stripe_index = mirror_num - 1; |
a1d3c478 JS |
3841 | } else { |
3842 | mirror_num = 1; | |
3843 | } | |
2fff734f | 3844 | |
321aecc6 CM |
3845 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
3846 | int factor = map->num_stripes / map->sub_stripes; | |
321aecc6 CM |
3847 | |
3848 | stripe_index = do_div(stripe_nr, factor); | |
3849 | stripe_index *= map->sub_stripes; | |
3850 | ||
7eaceacc | 3851 | if (rw & REQ_WRITE) |
f2d8d74d | 3852 | num_stripes = map->sub_stripes; |
fce3bb9a LD |
3853 | else if (rw & REQ_DISCARD) |
3854 | num_stripes = min_t(u64, map->sub_stripes * | |
3855 | (stripe_nr_end - stripe_nr_orig), | |
3856 | map->num_stripes); | |
321aecc6 CM |
3857 | else if (mirror_num) |
3858 | stripe_index += mirror_num - 1; | |
dfe25020 | 3859 | else { |
3e74317a | 3860 | int old_stripe_index = stripe_index; |
dfe25020 CM |
3861 | stripe_index = find_live_mirror(map, stripe_index, |
3862 | map->sub_stripes, stripe_index + | |
3863 | current->pid % map->sub_stripes); | |
3e74317a | 3864 | mirror_num = stripe_index - old_stripe_index + 1; |
dfe25020 | 3865 | } |
8790d502 CM |
3866 | } else { |
3867 | /* | |
3868 | * after this do_div call, stripe_nr is the number of stripes | |
3869 | * on this device we have to walk to find the data, and | |
3870 | * stripe_index is the number of our device in the stripe array | |
3871 | */ | |
3872 | stripe_index = do_div(stripe_nr, map->num_stripes); | |
a1d3c478 | 3873 | mirror_num = stripe_index + 1; |
8790d502 | 3874 | } |
593060d7 | 3875 | BUG_ON(stripe_index >= map->num_stripes); |
cea9e445 | 3876 | |
de11cc12 LZ |
3877 | bbio = kzalloc(btrfs_bio_size(num_stripes), GFP_NOFS); |
3878 | if (!bbio) { | |
3879 | ret = -ENOMEM; | |
3880 | goto out; | |
3881 | } | |
3882 | atomic_set(&bbio->error, 0); | |
3883 | ||
fce3bb9a | 3884 | if (rw & REQ_DISCARD) { |
ec9ef7a1 LZ |
3885 | int factor = 0; |
3886 | int sub_stripes = 0; | |
3887 | u64 stripes_per_dev = 0; | |
3888 | u32 remaining_stripes = 0; | |
b89203f7 | 3889 | u32 last_stripe = 0; |
ec9ef7a1 LZ |
3890 | |
3891 | if (map->type & | |
3892 | (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID10)) { | |
3893 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
3894 | sub_stripes = 1; | |
3895 | else | |
3896 | sub_stripes = map->sub_stripes; | |
3897 | ||
3898 | factor = map->num_stripes / sub_stripes; | |
3899 | stripes_per_dev = div_u64_rem(stripe_nr_end - | |
3900 | stripe_nr_orig, | |
3901 | factor, | |
3902 | &remaining_stripes); | |
b89203f7 LB |
3903 | div_u64_rem(stripe_nr_end - 1, factor, &last_stripe); |
3904 | last_stripe *= sub_stripes; | |
ec9ef7a1 LZ |
3905 | } |
3906 | ||
fce3bb9a | 3907 | for (i = 0; i < num_stripes; i++) { |
a1d3c478 | 3908 | bbio->stripes[i].physical = |
f2d8d74d CM |
3909 | map->stripes[stripe_index].physical + |
3910 | stripe_offset + stripe_nr * map->stripe_len; | |
a1d3c478 | 3911 | bbio->stripes[i].dev = map->stripes[stripe_index].dev; |
fce3bb9a | 3912 | |
ec9ef7a1 LZ |
3913 | if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | |
3914 | BTRFS_BLOCK_GROUP_RAID10)) { | |
3915 | bbio->stripes[i].length = stripes_per_dev * | |
3916 | map->stripe_len; | |
b89203f7 | 3917 | |
ec9ef7a1 LZ |
3918 | if (i / sub_stripes < remaining_stripes) |
3919 | bbio->stripes[i].length += | |
3920 | map->stripe_len; | |
b89203f7 LB |
3921 | |
3922 | /* | |
3923 | * Special for the first stripe and | |
3924 | * the last stripe: | |
3925 | * | |
3926 | * |-------|...|-------| | |
3927 | * |----------| | |
3928 | * off end_off | |
3929 | */ | |
ec9ef7a1 | 3930 | if (i < sub_stripes) |
a1d3c478 | 3931 | bbio->stripes[i].length -= |
fce3bb9a | 3932 | stripe_offset; |
b89203f7 LB |
3933 | |
3934 | if (stripe_index >= last_stripe && | |
3935 | stripe_index <= (last_stripe + | |
3936 | sub_stripes - 1)) | |
a1d3c478 | 3937 | bbio->stripes[i].length -= |
fce3bb9a | 3938 | stripe_end_offset; |
b89203f7 | 3939 | |
ec9ef7a1 LZ |
3940 | if (i == sub_stripes - 1) |
3941 | stripe_offset = 0; | |
fce3bb9a | 3942 | } else |
a1d3c478 | 3943 | bbio->stripes[i].length = *length; |
fce3bb9a LD |
3944 | |
3945 | stripe_index++; | |
3946 | if (stripe_index == map->num_stripes) { | |
3947 | /* This could only happen for RAID0/10 */ | |
3948 | stripe_index = 0; | |
3949 | stripe_nr++; | |
3950 | } | |
3951 | } | |
3952 | } else { | |
3953 | for (i = 0; i < num_stripes; i++) { | |
a1d3c478 | 3954 | bbio->stripes[i].physical = |
212a17ab LT |
3955 | map->stripes[stripe_index].physical + |
3956 | stripe_offset + | |
3957 | stripe_nr * map->stripe_len; | |
a1d3c478 | 3958 | bbio->stripes[i].dev = |
212a17ab | 3959 | map->stripes[stripe_index].dev; |
fce3bb9a | 3960 | stripe_index++; |
f2d8d74d | 3961 | } |
593060d7 | 3962 | } |
de11cc12 LZ |
3963 | |
3964 | if (rw & REQ_WRITE) { | |
3965 | if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | | |
3966 | BTRFS_BLOCK_GROUP_RAID10 | | |
3967 | BTRFS_BLOCK_GROUP_DUP)) { | |
3968 | max_errors = 1; | |
3969 | } | |
f2d8d74d | 3970 | } |
de11cc12 LZ |
3971 | |
3972 | *bbio_ret = bbio; | |
3973 | bbio->num_stripes = num_stripes; | |
3974 | bbio->max_errors = max_errors; | |
3975 | bbio->mirror_num = mirror_num; | |
cea9e445 | 3976 | out: |
0b86a832 | 3977 | free_extent_map(em); |
de11cc12 | 3978 | return ret; |
0b86a832 CM |
3979 | } |
3980 | ||
f2d8d74d CM |
3981 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
3982 | u64 logical, u64 *length, | |
a1d3c478 | 3983 | struct btrfs_bio **bbio_ret, int mirror_num) |
f2d8d74d | 3984 | { |
a1d3c478 | 3985 | return __btrfs_map_block(map_tree, rw, logical, length, bbio_ret, |
7eaceacc | 3986 | mirror_num); |
f2d8d74d CM |
3987 | } |
3988 | ||
a512bbf8 YZ |
3989 | int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, |
3990 | u64 chunk_start, u64 physical, u64 devid, | |
3991 | u64 **logical, int *naddrs, int *stripe_len) | |
3992 | { | |
3993 | struct extent_map_tree *em_tree = &map_tree->map_tree; | |
3994 | struct extent_map *em; | |
3995 | struct map_lookup *map; | |
3996 | u64 *buf; | |
3997 | u64 bytenr; | |
3998 | u64 length; | |
3999 | u64 stripe_nr; | |
4000 | int i, j, nr = 0; | |
4001 | ||
890871be | 4002 | read_lock(&em_tree->lock); |
a512bbf8 | 4003 | em = lookup_extent_mapping(em_tree, chunk_start, 1); |
890871be | 4004 | read_unlock(&em_tree->lock); |
a512bbf8 YZ |
4005 | |
4006 | BUG_ON(!em || em->start != chunk_start); | |
4007 | map = (struct map_lookup *)em->bdev; | |
4008 | ||
4009 | length = em->len; | |
4010 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) | |
4011 | do_div(length, map->num_stripes / map->sub_stripes); | |
4012 | else if (map->type & BTRFS_BLOCK_GROUP_RAID0) | |
4013 | do_div(length, map->num_stripes); | |
4014 | ||
4015 | buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); | |
79787eaa | 4016 | BUG_ON(!buf); /* -ENOMEM */ |
a512bbf8 YZ |
4017 | |
4018 | for (i = 0; i < map->num_stripes; i++) { | |
4019 | if (devid && map->stripes[i].dev->devid != devid) | |
4020 | continue; | |
4021 | if (map->stripes[i].physical > physical || | |
4022 | map->stripes[i].physical + length <= physical) | |
4023 | continue; | |
4024 | ||
4025 | stripe_nr = physical - map->stripes[i].physical; | |
4026 | do_div(stripe_nr, map->stripe_len); | |
4027 | ||
4028 | if (map->type & BTRFS_BLOCK_GROUP_RAID10) { | |
4029 | stripe_nr = stripe_nr * map->num_stripes + i; | |
4030 | do_div(stripe_nr, map->sub_stripes); | |
4031 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { | |
4032 | stripe_nr = stripe_nr * map->num_stripes + i; | |
4033 | } | |
4034 | bytenr = chunk_start + stripe_nr * map->stripe_len; | |
934d375b | 4035 | WARN_ON(nr >= map->num_stripes); |
a512bbf8 YZ |
4036 | for (j = 0; j < nr; j++) { |
4037 | if (buf[j] == bytenr) | |
4038 | break; | |
4039 | } | |
934d375b CM |
4040 | if (j == nr) { |
4041 | WARN_ON(nr >= map->num_stripes); | |
a512bbf8 | 4042 | buf[nr++] = bytenr; |
934d375b | 4043 | } |
a512bbf8 YZ |
4044 | } |
4045 | ||
a512bbf8 YZ |
4046 | *logical = buf; |
4047 | *naddrs = nr; | |
4048 | *stripe_len = map->stripe_len; | |
4049 | ||
4050 | free_extent_map(em); | |
4051 | return 0; | |
f2d8d74d CM |
4052 | } |
4053 | ||
442a4f63 SB |
4054 | static void *merge_stripe_index_into_bio_private(void *bi_private, |
4055 | unsigned int stripe_index) | |
4056 | { | |
4057 | /* | |
4058 | * with single, dup, RAID0, RAID1 and RAID10, stripe_index is | |
4059 | * at most 1. | |
4060 | * The alternative solution (instead of stealing bits from the | |
4061 | * pointer) would be to allocate an intermediate structure | |
4062 | * that contains the old private pointer plus the stripe_index. | |
4063 | */ | |
4064 | BUG_ON((((uintptr_t)bi_private) & 3) != 0); | |
4065 | BUG_ON(stripe_index > 3); | |
4066 | return (void *)(((uintptr_t)bi_private) | stripe_index); | |
4067 | } | |
4068 | ||
4069 | static struct btrfs_bio *extract_bbio_from_bio_private(void *bi_private) | |
4070 | { | |
4071 | return (struct btrfs_bio *)(((uintptr_t)bi_private) & ~((uintptr_t)3)); | |
4072 | } | |
4073 | ||
4074 | static unsigned int extract_stripe_index_from_bio_private(void *bi_private) | |
4075 | { | |
4076 | return (unsigned int)((uintptr_t)bi_private) & 3; | |
4077 | } | |
4078 | ||
a1d3c478 | 4079 | static void btrfs_end_bio(struct bio *bio, int err) |
8790d502 | 4080 | { |
442a4f63 | 4081 | struct btrfs_bio *bbio = extract_bbio_from_bio_private(bio->bi_private); |
7d2b4daa | 4082 | int is_orig_bio = 0; |
8790d502 | 4083 | |
442a4f63 | 4084 | if (err) { |
a1d3c478 | 4085 | atomic_inc(&bbio->error); |
442a4f63 SB |
4086 | if (err == -EIO || err == -EREMOTEIO) { |
4087 | unsigned int stripe_index = | |
4088 | extract_stripe_index_from_bio_private( | |
4089 | bio->bi_private); | |
4090 | struct btrfs_device *dev; | |
4091 | ||
4092 | BUG_ON(stripe_index >= bbio->num_stripes); | |
4093 | dev = bbio->stripes[stripe_index].dev; | |
597a60fa SB |
4094 | if (dev->bdev) { |
4095 | if (bio->bi_rw & WRITE) | |
4096 | btrfs_dev_stat_inc(dev, | |
4097 | BTRFS_DEV_STAT_WRITE_ERRS); | |
4098 | else | |
4099 | btrfs_dev_stat_inc(dev, | |
4100 | BTRFS_DEV_STAT_READ_ERRS); | |
4101 | if ((bio->bi_rw & WRITE_FLUSH) == WRITE_FLUSH) | |
4102 | btrfs_dev_stat_inc(dev, | |
4103 | BTRFS_DEV_STAT_FLUSH_ERRS); | |
4104 | btrfs_dev_stat_print_on_error(dev); | |
4105 | } | |
442a4f63 SB |
4106 | } |
4107 | } | |
8790d502 | 4108 | |
a1d3c478 | 4109 | if (bio == bbio->orig_bio) |
7d2b4daa CM |
4110 | is_orig_bio = 1; |
4111 | ||
a1d3c478 | 4112 | if (atomic_dec_and_test(&bbio->stripes_pending)) { |
7d2b4daa CM |
4113 | if (!is_orig_bio) { |
4114 | bio_put(bio); | |
a1d3c478 | 4115 | bio = bbio->orig_bio; |
7d2b4daa | 4116 | } |
a1d3c478 JS |
4117 | bio->bi_private = bbio->private; |
4118 | bio->bi_end_io = bbio->end_io; | |
2774b2ca JS |
4119 | bio->bi_bdev = (struct block_device *) |
4120 | (unsigned long)bbio->mirror_num; | |
a236aed1 CM |
4121 | /* only send an error to the higher layers if it is |
4122 | * beyond the tolerance of the multi-bio | |
4123 | */ | |
a1d3c478 | 4124 | if (atomic_read(&bbio->error) > bbio->max_errors) { |
a236aed1 | 4125 | err = -EIO; |
5dbc8fca | 4126 | } else { |
1259ab75 CM |
4127 | /* |
4128 | * this bio is actually up to date, we didn't | |
4129 | * go over the max number of errors | |
4130 | */ | |
4131 | set_bit(BIO_UPTODATE, &bio->bi_flags); | |
a236aed1 | 4132 | err = 0; |
1259ab75 | 4133 | } |
a1d3c478 | 4134 | kfree(bbio); |
8790d502 CM |
4135 | |
4136 | bio_endio(bio, err); | |
7d2b4daa | 4137 | } else if (!is_orig_bio) { |
8790d502 CM |
4138 | bio_put(bio); |
4139 | } | |
8790d502 CM |
4140 | } |
4141 | ||
8b712842 CM |
4142 | struct async_sched { |
4143 | struct bio *bio; | |
4144 | int rw; | |
4145 | struct btrfs_fs_info *info; | |
4146 | struct btrfs_work work; | |
4147 | }; | |
4148 | ||
4149 | /* | |
4150 | * see run_scheduled_bios for a description of why bios are collected for | |
4151 | * async submit. | |
4152 | * | |
4153 | * This will add one bio to the pending list for a device and make sure | |
4154 | * the work struct is scheduled. | |
4155 | */ | |
143bede5 | 4156 | static noinline void schedule_bio(struct btrfs_root *root, |
a1b32a59 CM |
4157 | struct btrfs_device *device, |
4158 | int rw, struct bio *bio) | |
8b712842 CM |
4159 | { |
4160 | int should_queue = 1; | |
ffbd517d | 4161 | struct btrfs_pending_bios *pending_bios; |
8b712842 CM |
4162 | |
4163 | /* don't bother with additional async steps for reads, right now */ | |
7b6d91da | 4164 | if (!(rw & REQ_WRITE)) { |
492bb6de | 4165 | bio_get(bio); |
21adbd5c | 4166 | btrfsic_submit_bio(rw, bio); |
492bb6de | 4167 | bio_put(bio); |
143bede5 | 4168 | return; |
8b712842 CM |
4169 | } |
4170 | ||
4171 | /* | |
0986fe9e | 4172 | * nr_async_bios allows us to reliably return congestion to the |
8b712842 CM |
4173 | * higher layers. Otherwise, the async bio makes it appear we have |
4174 | * made progress against dirty pages when we've really just put it | |
4175 | * on a queue for later | |
4176 | */ | |
0986fe9e | 4177 | atomic_inc(&root->fs_info->nr_async_bios); |
492bb6de | 4178 | WARN_ON(bio->bi_next); |
8b712842 CM |
4179 | bio->bi_next = NULL; |
4180 | bio->bi_rw |= rw; | |
4181 | ||
4182 | spin_lock(&device->io_lock); | |
7b6d91da | 4183 | if (bio->bi_rw & REQ_SYNC) |
ffbd517d CM |
4184 | pending_bios = &device->pending_sync_bios; |
4185 | else | |
4186 | pending_bios = &device->pending_bios; | |
8b712842 | 4187 | |
ffbd517d CM |
4188 | if (pending_bios->tail) |
4189 | pending_bios->tail->bi_next = bio; | |
8b712842 | 4190 | |
ffbd517d CM |
4191 | pending_bios->tail = bio; |
4192 | if (!pending_bios->head) | |
4193 | pending_bios->head = bio; | |
8b712842 CM |
4194 | if (device->running_pending) |
4195 | should_queue = 0; | |
4196 | ||
4197 | spin_unlock(&device->io_lock); | |
4198 | ||
4199 | if (should_queue) | |
1cc127b5 CM |
4200 | btrfs_queue_worker(&root->fs_info->submit_workers, |
4201 | &device->work); | |
8b712842 CM |
4202 | } |
4203 | ||
f188591e | 4204 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 4205 | int mirror_num, int async_submit) |
0b86a832 CM |
4206 | { |
4207 | struct btrfs_mapping_tree *map_tree; | |
4208 | struct btrfs_device *dev; | |
8790d502 | 4209 | struct bio *first_bio = bio; |
a62b9401 | 4210 | u64 logical = (u64)bio->bi_sector << 9; |
0b86a832 CM |
4211 | u64 length = 0; |
4212 | u64 map_length; | |
0b86a832 | 4213 | int ret; |
8790d502 CM |
4214 | int dev_nr = 0; |
4215 | int total_devs = 1; | |
a1d3c478 | 4216 | struct btrfs_bio *bbio = NULL; |
0b86a832 | 4217 | |
f2d8d74d | 4218 | length = bio->bi_size; |
0b86a832 CM |
4219 | map_tree = &root->fs_info->mapping_tree; |
4220 | map_length = length; | |
cea9e445 | 4221 | |
a1d3c478 | 4222 | ret = btrfs_map_block(map_tree, rw, logical, &map_length, &bbio, |
f188591e | 4223 | mirror_num); |
79787eaa JM |
4224 | if (ret) /* -ENOMEM */ |
4225 | return ret; | |
cea9e445 | 4226 | |
a1d3c478 | 4227 | total_devs = bbio->num_stripes; |
cea9e445 | 4228 | if (map_length < length) { |
48940662 | 4229 | printk(KERN_CRIT "btrfs: mapping failed logical %llu bio len %llu " |
d397712b CM |
4230 | "len %llu\n", (unsigned long long)logical, |
4231 | (unsigned long long)length, | |
4232 | (unsigned long long)map_length); | |
cea9e445 CM |
4233 | BUG(); |
4234 | } | |
a1d3c478 JS |
4235 | |
4236 | bbio->orig_bio = first_bio; | |
4237 | bbio->private = first_bio->bi_private; | |
4238 | bbio->end_io = first_bio->bi_end_io; | |
4239 | atomic_set(&bbio->stripes_pending, bbio->num_stripes); | |
cea9e445 | 4240 | |
d397712b | 4241 | while (dev_nr < total_devs) { |
a1d3c478 JS |
4242 | if (dev_nr < total_devs - 1) { |
4243 | bio = bio_clone(first_bio, GFP_NOFS); | |
79787eaa | 4244 | BUG_ON(!bio); /* -ENOMEM */ |
a1d3c478 JS |
4245 | } else { |
4246 | bio = first_bio; | |
8790d502 | 4247 | } |
a1d3c478 | 4248 | bio->bi_private = bbio; |
442a4f63 SB |
4249 | bio->bi_private = merge_stripe_index_into_bio_private( |
4250 | bio->bi_private, (unsigned int)dev_nr); | |
a1d3c478 JS |
4251 | bio->bi_end_io = btrfs_end_bio; |
4252 | bio->bi_sector = bbio->stripes[dev_nr].physical >> 9; | |
4253 | dev = bbio->stripes[dev_nr].dev; | |
18e503d6 | 4254 | if (dev && dev->bdev && (rw != WRITE || dev->writeable)) { |
606686ee JB |
4255 | #ifdef DEBUG |
4256 | struct rcu_string *name; | |
4257 | ||
4258 | rcu_read_lock(); | |
4259 | name = rcu_dereference(dev->name); | |
a1d3c478 JS |
4260 | pr_debug("btrfs_map_bio: rw %d, secor=%llu, dev=%lu " |
4261 | "(%s id %llu), size=%u\n", rw, | |
4262 | (u64)bio->bi_sector, (u_long)dev->bdev->bd_dev, | |
606686ee JB |
4263 | name->str, dev->devid, bio->bi_size); |
4264 | rcu_read_unlock(); | |
4265 | #endif | |
dfe25020 | 4266 | bio->bi_bdev = dev->bdev; |
8b712842 CM |
4267 | if (async_submit) |
4268 | schedule_bio(root, dev, rw, bio); | |
4269 | else | |
21adbd5c | 4270 | btrfsic_submit_bio(rw, bio); |
dfe25020 CM |
4271 | } else { |
4272 | bio->bi_bdev = root->fs_info->fs_devices->latest_bdev; | |
4273 | bio->bi_sector = logical >> 9; | |
dfe25020 | 4274 | bio_endio(bio, -EIO); |
dfe25020 | 4275 | } |
8790d502 CM |
4276 | dev_nr++; |
4277 | } | |
0b86a832 CM |
4278 | return 0; |
4279 | } | |
4280 | ||
a443755f | 4281 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, |
2b82032c | 4282 | u8 *uuid, u8 *fsid) |
0b86a832 | 4283 | { |
2b82032c YZ |
4284 | struct btrfs_device *device; |
4285 | struct btrfs_fs_devices *cur_devices; | |
4286 | ||
4287 | cur_devices = root->fs_info->fs_devices; | |
4288 | while (cur_devices) { | |
4289 | if (!fsid || | |
4290 | !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
4291 | device = __find_device(&cur_devices->devices, | |
4292 | devid, uuid); | |
4293 | if (device) | |
4294 | return device; | |
4295 | } | |
4296 | cur_devices = cur_devices->seed; | |
4297 | } | |
4298 | return NULL; | |
0b86a832 CM |
4299 | } |
4300 | ||
dfe25020 CM |
4301 | static struct btrfs_device *add_missing_dev(struct btrfs_root *root, |
4302 | u64 devid, u8 *dev_uuid) | |
4303 | { | |
4304 | struct btrfs_device *device; | |
4305 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
4306 | ||
4307 | device = kzalloc(sizeof(*device), GFP_NOFS); | |
7cbd8a83 | 4308 | if (!device) |
4309 | return NULL; | |
dfe25020 CM |
4310 | list_add(&device->dev_list, |
4311 | &fs_devices->devices); | |
dfe25020 CM |
4312 | device->dev_root = root->fs_info->dev_root; |
4313 | device->devid = devid; | |
8b712842 | 4314 | device->work.func = pending_bios_fn; |
e4404d6e | 4315 | device->fs_devices = fs_devices; |
cd02dca5 | 4316 | device->missing = 1; |
dfe25020 | 4317 | fs_devices->num_devices++; |
cd02dca5 | 4318 | fs_devices->missing_devices++; |
dfe25020 | 4319 | spin_lock_init(&device->io_lock); |
d20f7043 | 4320 | INIT_LIST_HEAD(&device->dev_alloc_list); |
dfe25020 CM |
4321 | memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE); |
4322 | return device; | |
4323 | } | |
4324 | ||
0b86a832 CM |
4325 | static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, |
4326 | struct extent_buffer *leaf, | |
4327 | struct btrfs_chunk *chunk) | |
4328 | { | |
4329 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
4330 | struct map_lookup *map; | |
4331 | struct extent_map *em; | |
4332 | u64 logical; | |
4333 | u64 length; | |
4334 | u64 devid; | |
a443755f | 4335 | u8 uuid[BTRFS_UUID_SIZE]; |
593060d7 | 4336 | int num_stripes; |
0b86a832 | 4337 | int ret; |
593060d7 | 4338 | int i; |
0b86a832 | 4339 | |
e17cade2 CM |
4340 | logical = key->offset; |
4341 | length = btrfs_chunk_length(leaf, chunk); | |
a061fc8d | 4342 | |
890871be | 4343 | read_lock(&map_tree->map_tree.lock); |
0b86a832 | 4344 | em = lookup_extent_mapping(&map_tree->map_tree, logical, 1); |
890871be | 4345 | read_unlock(&map_tree->map_tree.lock); |
0b86a832 CM |
4346 | |
4347 | /* already mapped? */ | |
4348 | if (em && em->start <= logical && em->start + em->len > logical) { | |
4349 | free_extent_map(em); | |
0b86a832 CM |
4350 | return 0; |
4351 | } else if (em) { | |
4352 | free_extent_map(em); | |
4353 | } | |
0b86a832 | 4354 | |
172ddd60 | 4355 | em = alloc_extent_map(); |
0b86a832 CM |
4356 | if (!em) |
4357 | return -ENOMEM; | |
593060d7 CM |
4358 | num_stripes = btrfs_chunk_num_stripes(leaf, chunk); |
4359 | map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS); | |
0b86a832 CM |
4360 | if (!map) { |
4361 | free_extent_map(em); | |
4362 | return -ENOMEM; | |
4363 | } | |
4364 | ||
4365 | em->bdev = (struct block_device *)map; | |
4366 | em->start = logical; | |
4367 | em->len = length; | |
4368 | em->block_start = 0; | |
c8b97818 | 4369 | em->block_len = em->len; |
0b86a832 | 4370 | |
593060d7 CM |
4371 | map->num_stripes = num_stripes; |
4372 | map->io_width = btrfs_chunk_io_width(leaf, chunk); | |
4373 | map->io_align = btrfs_chunk_io_align(leaf, chunk); | |
4374 | map->sector_size = btrfs_chunk_sector_size(leaf, chunk); | |
4375 | map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); | |
4376 | map->type = btrfs_chunk_type(leaf, chunk); | |
321aecc6 | 4377 | map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); |
593060d7 CM |
4378 | for (i = 0; i < num_stripes; i++) { |
4379 | map->stripes[i].physical = | |
4380 | btrfs_stripe_offset_nr(leaf, chunk, i); | |
4381 | devid = btrfs_stripe_devid_nr(leaf, chunk, i); | |
a443755f CM |
4382 | read_extent_buffer(leaf, uuid, (unsigned long) |
4383 | btrfs_stripe_dev_uuid_nr(chunk, i), | |
4384 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
4385 | map->stripes[i].dev = btrfs_find_device(root, devid, uuid, |
4386 | NULL); | |
dfe25020 | 4387 | if (!map->stripes[i].dev && !btrfs_test_opt(root, DEGRADED)) { |
593060d7 CM |
4388 | kfree(map); |
4389 | free_extent_map(em); | |
4390 | return -EIO; | |
4391 | } | |
dfe25020 CM |
4392 | if (!map->stripes[i].dev) { |
4393 | map->stripes[i].dev = | |
4394 | add_missing_dev(root, devid, uuid); | |
4395 | if (!map->stripes[i].dev) { | |
4396 | kfree(map); | |
4397 | free_extent_map(em); | |
4398 | return -EIO; | |
4399 | } | |
4400 | } | |
4401 | map->stripes[i].dev->in_fs_metadata = 1; | |
0b86a832 CM |
4402 | } |
4403 | ||
890871be | 4404 | write_lock(&map_tree->map_tree.lock); |
0b86a832 | 4405 | ret = add_extent_mapping(&map_tree->map_tree, em); |
890871be | 4406 | write_unlock(&map_tree->map_tree.lock); |
79787eaa | 4407 | BUG_ON(ret); /* Tree corruption */ |
0b86a832 CM |
4408 | free_extent_map(em); |
4409 | ||
4410 | return 0; | |
4411 | } | |
4412 | ||
143bede5 | 4413 | static void fill_device_from_item(struct extent_buffer *leaf, |
0b86a832 CM |
4414 | struct btrfs_dev_item *dev_item, |
4415 | struct btrfs_device *device) | |
4416 | { | |
4417 | unsigned long ptr; | |
0b86a832 CM |
4418 | |
4419 | device->devid = btrfs_device_id(leaf, dev_item); | |
d6397bae CB |
4420 | device->disk_total_bytes = btrfs_device_total_bytes(leaf, dev_item); |
4421 | device->total_bytes = device->disk_total_bytes; | |
0b86a832 CM |
4422 | device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); |
4423 | device->type = btrfs_device_type(leaf, dev_item); | |
4424 | device->io_align = btrfs_device_io_align(leaf, dev_item); | |
4425 | device->io_width = btrfs_device_io_width(leaf, dev_item); | |
4426 | device->sector_size = btrfs_device_sector_size(leaf, dev_item); | |
0b86a832 CM |
4427 | |
4428 | ptr = (unsigned long)btrfs_device_uuid(dev_item); | |
e17cade2 | 4429 | read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); |
0b86a832 CM |
4430 | } |
4431 | ||
2b82032c YZ |
4432 | static int open_seed_devices(struct btrfs_root *root, u8 *fsid) |
4433 | { | |
4434 | struct btrfs_fs_devices *fs_devices; | |
4435 | int ret; | |
4436 | ||
b367e47f | 4437 | BUG_ON(!mutex_is_locked(&uuid_mutex)); |
2b82032c YZ |
4438 | |
4439 | fs_devices = root->fs_info->fs_devices->seed; | |
4440 | while (fs_devices) { | |
4441 | if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) { | |
4442 | ret = 0; | |
4443 | goto out; | |
4444 | } | |
4445 | fs_devices = fs_devices->seed; | |
4446 | } | |
4447 | ||
4448 | fs_devices = find_fsid(fsid); | |
4449 | if (!fs_devices) { | |
4450 | ret = -ENOENT; | |
4451 | goto out; | |
4452 | } | |
e4404d6e YZ |
4453 | |
4454 | fs_devices = clone_fs_devices(fs_devices); | |
4455 | if (IS_ERR(fs_devices)) { | |
4456 | ret = PTR_ERR(fs_devices); | |
2b82032c YZ |
4457 | goto out; |
4458 | } | |
4459 | ||
97288f2c | 4460 | ret = __btrfs_open_devices(fs_devices, FMODE_READ, |
15916de8 | 4461 | root->fs_info->bdev_holder); |
48d28232 JL |
4462 | if (ret) { |
4463 | free_fs_devices(fs_devices); | |
2b82032c | 4464 | goto out; |
48d28232 | 4465 | } |
2b82032c YZ |
4466 | |
4467 | if (!fs_devices->seeding) { | |
4468 | __btrfs_close_devices(fs_devices); | |
e4404d6e | 4469 | free_fs_devices(fs_devices); |
2b82032c YZ |
4470 | ret = -EINVAL; |
4471 | goto out; | |
4472 | } | |
4473 | ||
4474 | fs_devices->seed = root->fs_info->fs_devices->seed; | |
4475 | root->fs_info->fs_devices->seed = fs_devices; | |
2b82032c | 4476 | out: |
2b82032c YZ |
4477 | return ret; |
4478 | } | |
4479 | ||
0d81ba5d | 4480 | static int read_one_dev(struct btrfs_root *root, |
0b86a832 CM |
4481 | struct extent_buffer *leaf, |
4482 | struct btrfs_dev_item *dev_item) | |
4483 | { | |
4484 | struct btrfs_device *device; | |
4485 | u64 devid; | |
4486 | int ret; | |
2b82032c | 4487 | u8 fs_uuid[BTRFS_UUID_SIZE]; |
a443755f CM |
4488 | u8 dev_uuid[BTRFS_UUID_SIZE]; |
4489 | ||
0b86a832 | 4490 | devid = btrfs_device_id(leaf, dev_item); |
a443755f CM |
4491 | read_extent_buffer(leaf, dev_uuid, |
4492 | (unsigned long)btrfs_device_uuid(dev_item), | |
4493 | BTRFS_UUID_SIZE); | |
2b82032c YZ |
4494 | read_extent_buffer(leaf, fs_uuid, |
4495 | (unsigned long)btrfs_device_fsid(dev_item), | |
4496 | BTRFS_UUID_SIZE); | |
4497 | ||
4498 | if (memcmp(fs_uuid, root->fs_info->fsid, BTRFS_UUID_SIZE)) { | |
4499 | ret = open_seed_devices(root, fs_uuid); | |
e4404d6e | 4500 | if (ret && !btrfs_test_opt(root, DEGRADED)) |
2b82032c | 4501 | return ret; |
2b82032c YZ |
4502 | } |
4503 | ||
4504 | device = btrfs_find_device(root, devid, dev_uuid, fs_uuid); | |
4505 | if (!device || !device->bdev) { | |
e4404d6e | 4506 | if (!btrfs_test_opt(root, DEGRADED)) |
2b82032c YZ |
4507 | return -EIO; |
4508 | ||
4509 | if (!device) { | |
d397712b CM |
4510 | printk(KERN_WARNING "warning devid %llu missing\n", |
4511 | (unsigned long long)devid); | |
2b82032c YZ |
4512 | device = add_missing_dev(root, devid, dev_uuid); |
4513 | if (!device) | |
4514 | return -ENOMEM; | |
cd02dca5 CM |
4515 | } else if (!device->missing) { |
4516 | /* | |
4517 | * this happens when a device that was properly setup | |
4518 | * in the device info lists suddenly goes bad. | |
4519 | * device->bdev is NULL, and so we have to set | |
4520 | * device->missing to one here | |
4521 | */ | |
4522 | root->fs_info->fs_devices->missing_devices++; | |
4523 | device->missing = 1; | |
2b82032c YZ |
4524 | } |
4525 | } | |
4526 | ||
4527 | if (device->fs_devices != root->fs_info->fs_devices) { | |
4528 | BUG_ON(device->writeable); | |
4529 | if (device->generation != | |
4530 | btrfs_device_generation(leaf, dev_item)) | |
4531 | return -EINVAL; | |
6324fbf3 | 4532 | } |
0b86a832 CM |
4533 | |
4534 | fill_device_from_item(leaf, dev_item, device); | |
4535 | device->dev_root = root->fs_info->dev_root; | |
dfe25020 | 4536 | device->in_fs_metadata = 1; |
2bf64758 | 4537 | if (device->writeable) { |
2b82032c | 4538 | device->fs_devices->total_rw_bytes += device->total_bytes; |
2bf64758 JB |
4539 | spin_lock(&root->fs_info->free_chunk_lock); |
4540 | root->fs_info->free_chunk_space += device->total_bytes - | |
4541 | device->bytes_used; | |
4542 | spin_unlock(&root->fs_info->free_chunk_lock); | |
4543 | } | |
0b86a832 | 4544 | ret = 0; |
0b86a832 CM |
4545 | return ret; |
4546 | } | |
4547 | ||
e4404d6e | 4548 | int btrfs_read_sys_array(struct btrfs_root *root) |
0b86a832 | 4549 | { |
6c41761f | 4550 | struct btrfs_super_block *super_copy = root->fs_info->super_copy; |
a061fc8d | 4551 | struct extent_buffer *sb; |
0b86a832 | 4552 | struct btrfs_disk_key *disk_key; |
0b86a832 | 4553 | struct btrfs_chunk *chunk; |
84eed90f CM |
4554 | u8 *ptr; |
4555 | unsigned long sb_ptr; | |
4556 | int ret = 0; | |
0b86a832 CM |
4557 | u32 num_stripes; |
4558 | u32 array_size; | |
4559 | u32 len = 0; | |
0b86a832 | 4560 | u32 cur; |
84eed90f | 4561 | struct btrfs_key key; |
0b86a832 | 4562 | |
e4404d6e | 4563 | sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET, |
a061fc8d CM |
4564 | BTRFS_SUPER_INFO_SIZE); |
4565 | if (!sb) | |
4566 | return -ENOMEM; | |
4567 | btrfs_set_buffer_uptodate(sb); | |
85d4e461 | 4568 | btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0); |
8a334426 DS |
4569 | /* |
4570 | * The sb extent buffer is artifical and just used to read the system array. | |
4571 | * btrfs_set_buffer_uptodate() call does not properly mark all it's | |
4572 | * pages up-to-date when the page is larger: extent does not cover the | |
4573 | * whole page and consequently check_page_uptodate does not find all | |
4574 | * the page's extents up-to-date (the hole beyond sb), | |
4575 | * write_extent_buffer then triggers a WARN_ON. | |
4576 | * | |
4577 | * Regular short extents go through mark_extent_buffer_dirty/writeback cycle, | |
4578 | * but sb spans only this function. Add an explicit SetPageUptodate call | |
4579 | * to silence the warning eg. on PowerPC 64. | |
4580 | */ | |
4581 | if (PAGE_CACHE_SIZE > BTRFS_SUPER_INFO_SIZE) | |
727011e0 | 4582 | SetPageUptodate(sb->pages[0]); |
4008c04a | 4583 | |
a061fc8d | 4584 | write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE); |
0b86a832 CM |
4585 | array_size = btrfs_super_sys_array_size(super_copy); |
4586 | ||
0b86a832 CM |
4587 | ptr = super_copy->sys_chunk_array; |
4588 | sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array); | |
4589 | cur = 0; | |
4590 | ||
4591 | while (cur < array_size) { | |
4592 | disk_key = (struct btrfs_disk_key *)ptr; | |
4593 | btrfs_disk_key_to_cpu(&key, disk_key); | |
4594 | ||
a061fc8d | 4595 | len = sizeof(*disk_key); ptr += len; |
0b86a832 CM |
4596 | sb_ptr += len; |
4597 | cur += len; | |
4598 | ||
0d81ba5d | 4599 | if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
0b86a832 | 4600 | chunk = (struct btrfs_chunk *)sb_ptr; |
0d81ba5d | 4601 | ret = read_one_chunk(root, &key, sb, chunk); |
84eed90f CM |
4602 | if (ret) |
4603 | break; | |
0b86a832 CM |
4604 | num_stripes = btrfs_chunk_num_stripes(sb, chunk); |
4605 | len = btrfs_chunk_item_size(num_stripes); | |
4606 | } else { | |
84eed90f CM |
4607 | ret = -EIO; |
4608 | break; | |
0b86a832 CM |
4609 | } |
4610 | ptr += len; | |
4611 | sb_ptr += len; | |
4612 | cur += len; | |
4613 | } | |
a061fc8d | 4614 | free_extent_buffer(sb); |
84eed90f | 4615 | return ret; |
0b86a832 CM |
4616 | } |
4617 | ||
4618 | int btrfs_read_chunk_tree(struct btrfs_root *root) | |
4619 | { | |
4620 | struct btrfs_path *path; | |
4621 | struct extent_buffer *leaf; | |
4622 | struct btrfs_key key; | |
4623 | struct btrfs_key found_key; | |
4624 | int ret; | |
4625 | int slot; | |
4626 | ||
4627 | root = root->fs_info->chunk_root; | |
4628 | ||
4629 | path = btrfs_alloc_path(); | |
4630 | if (!path) | |
4631 | return -ENOMEM; | |
4632 | ||
b367e47f LZ |
4633 | mutex_lock(&uuid_mutex); |
4634 | lock_chunks(root); | |
4635 | ||
0b86a832 CM |
4636 | /* first we search for all of the device items, and then we |
4637 | * read in all of the chunk items. This way we can create chunk | |
4638 | * mappings that reference all of the devices that are afound | |
4639 | */ | |
4640 | key.objectid = BTRFS_DEV_ITEMS_OBJECTID; | |
4641 | key.offset = 0; | |
4642 | key.type = 0; | |
4643 | again: | |
4644 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
ab59381e ZL |
4645 | if (ret < 0) |
4646 | goto error; | |
d397712b | 4647 | while (1) { |
0b86a832 CM |
4648 | leaf = path->nodes[0]; |
4649 | slot = path->slots[0]; | |
4650 | if (slot >= btrfs_header_nritems(leaf)) { | |
4651 | ret = btrfs_next_leaf(root, path); | |
4652 | if (ret == 0) | |
4653 | continue; | |
4654 | if (ret < 0) | |
4655 | goto error; | |
4656 | break; | |
4657 | } | |
4658 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
4659 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
4660 | if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID) | |
4661 | break; | |
4662 | if (found_key.type == BTRFS_DEV_ITEM_KEY) { | |
4663 | struct btrfs_dev_item *dev_item; | |
4664 | dev_item = btrfs_item_ptr(leaf, slot, | |
4665 | struct btrfs_dev_item); | |
0d81ba5d | 4666 | ret = read_one_dev(root, leaf, dev_item); |
2b82032c YZ |
4667 | if (ret) |
4668 | goto error; | |
0b86a832 CM |
4669 | } |
4670 | } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { | |
4671 | struct btrfs_chunk *chunk; | |
4672 | chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); | |
4673 | ret = read_one_chunk(root, &found_key, leaf, chunk); | |
2b82032c YZ |
4674 | if (ret) |
4675 | goto error; | |
0b86a832 CM |
4676 | } |
4677 | path->slots[0]++; | |
4678 | } | |
4679 | if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) { | |
4680 | key.objectid = 0; | |
b3b4aa74 | 4681 | btrfs_release_path(path); |
0b86a832 CM |
4682 | goto again; |
4683 | } | |
0b86a832 CM |
4684 | ret = 0; |
4685 | error: | |
b367e47f LZ |
4686 | unlock_chunks(root); |
4687 | mutex_unlock(&uuid_mutex); | |
4688 | ||
2b82032c | 4689 | btrfs_free_path(path); |
0b86a832 CM |
4690 | return ret; |
4691 | } | |
442a4f63 | 4692 | |
733f4fbb SB |
4693 | static void __btrfs_reset_dev_stats(struct btrfs_device *dev) |
4694 | { | |
4695 | int i; | |
4696 | ||
4697 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
4698 | btrfs_dev_stat_reset(dev, i); | |
4699 | } | |
4700 | ||
4701 | int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info) | |
4702 | { | |
4703 | struct btrfs_key key; | |
4704 | struct btrfs_key found_key; | |
4705 | struct btrfs_root *dev_root = fs_info->dev_root; | |
4706 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
4707 | struct extent_buffer *eb; | |
4708 | int slot; | |
4709 | int ret = 0; | |
4710 | struct btrfs_device *device; | |
4711 | struct btrfs_path *path = NULL; | |
4712 | int i; | |
4713 | ||
4714 | path = btrfs_alloc_path(); | |
4715 | if (!path) { | |
4716 | ret = -ENOMEM; | |
4717 | goto out; | |
4718 | } | |
4719 | ||
4720 | mutex_lock(&fs_devices->device_list_mutex); | |
4721 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
4722 | int item_size; | |
4723 | struct btrfs_dev_stats_item *ptr; | |
4724 | ||
4725 | key.objectid = 0; | |
4726 | key.type = BTRFS_DEV_STATS_KEY; | |
4727 | key.offset = device->devid; | |
4728 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
4729 | if (ret) { | |
733f4fbb SB |
4730 | __btrfs_reset_dev_stats(device); |
4731 | device->dev_stats_valid = 1; | |
4732 | btrfs_release_path(path); | |
4733 | continue; | |
4734 | } | |
4735 | slot = path->slots[0]; | |
4736 | eb = path->nodes[0]; | |
4737 | btrfs_item_key_to_cpu(eb, &found_key, slot); | |
4738 | item_size = btrfs_item_size_nr(eb, slot); | |
4739 | ||
4740 | ptr = btrfs_item_ptr(eb, slot, | |
4741 | struct btrfs_dev_stats_item); | |
4742 | ||
4743 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { | |
4744 | if (item_size >= (1 + i) * sizeof(__le64)) | |
4745 | btrfs_dev_stat_set(device, i, | |
4746 | btrfs_dev_stats_value(eb, ptr, i)); | |
4747 | else | |
4748 | btrfs_dev_stat_reset(device, i); | |
4749 | } | |
4750 | ||
4751 | device->dev_stats_valid = 1; | |
4752 | btrfs_dev_stat_print_on_load(device); | |
4753 | btrfs_release_path(path); | |
4754 | } | |
4755 | mutex_unlock(&fs_devices->device_list_mutex); | |
4756 | ||
4757 | out: | |
4758 | btrfs_free_path(path); | |
4759 | return ret < 0 ? ret : 0; | |
4760 | } | |
4761 | ||
4762 | static int update_dev_stat_item(struct btrfs_trans_handle *trans, | |
4763 | struct btrfs_root *dev_root, | |
4764 | struct btrfs_device *device) | |
4765 | { | |
4766 | struct btrfs_path *path; | |
4767 | struct btrfs_key key; | |
4768 | struct extent_buffer *eb; | |
4769 | struct btrfs_dev_stats_item *ptr; | |
4770 | int ret; | |
4771 | int i; | |
4772 | ||
4773 | key.objectid = 0; | |
4774 | key.type = BTRFS_DEV_STATS_KEY; | |
4775 | key.offset = device->devid; | |
4776 | ||
4777 | path = btrfs_alloc_path(); | |
4778 | BUG_ON(!path); | |
4779 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
4780 | if (ret < 0) { | |
606686ee JB |
4781 | printk_in_rcu(KERN_WARNING "btrfs: error %d while searching for dev_stats item for device %s!\n", |
4782 | ret, rcu_str_deref(device->name)); | |
733f4fbb SB |
4783 | goto out; |
4784 | } | |
4785 | ||
4786 | if (ret == 0 && | |
4787 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
4788 | /* need to delete old one and insert a new one */ | |
4789 | ret = btrfs_del_item(trans, dev_root, path); | |
4790 | if (ret != 0) { | |
606686ee JB |
4791 | printk_in_rcu(KERN_WARNING "btrfs: delete too small dev_stats item for device %s failed %d!\n", |
4792 | rcu_str_deref(device->name), ret); | |
733f4fbb SB |
4793 | goto out; |
4794 | } | |
4795 | ret = 1; | |
4796 | } | |
4797 | ||
4798 | if (ret == 1) { | |
4799 | /* need to insert a new item */ | |
4800 | btrfs_release_path(path); | |
4801 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
4802 | &key, sizeof(*ptr)); | |
4803 | if (ret < 0) { | |
606686ee JB |
4804 | printk_in_rcu(KERN_WARNING "btrfs: insert dev_stats item for device %s failed %d!\n", |
4805 | rcu_str_deref(device->name), ret); | |
733f4fbb SB |
4806 | goto out; |
4807 | } | |
4808 | } | |
4809 | ||
4810 | eb = path->nodes[0]; | |
4811 | ptr = btrfs_item_ptr(eb, path->slots[0], struct btrfs_dev_stats_item); | |
4812 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
4813 | btrfs_set_dev_stats_value(eb, ptr, i, | |
4814 | btrfs_dev_stat_read(device, i)); | |
4815 | btrfs_mark_buffer_dirty(eb); | |
4816 | ||
4817 | out: | |
4818 | btrfs_free_path(path); | |
4819 | return ret; | |
4820 | } | |
4821 | ||
4822 | /* | |
4823 | * called from commit_transaction. Writes all changed device stats to disk. | |
4824 | */ | |
4825 | int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, | |
4826 | struct btrfs_fs_info *fs_info) | |
4827 | { | |
4828 | struct btrfs_root *dev_root = fs_info->dev_root; | |
4829 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
4830 | struct btrfs_device *device; | |
4831 | int ret = 0; | |
4832 | ||
4833 | mutex_lock(&fs_devices->device_list_mutex); | |
4834 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
4835 | if (!device->dev_stats_valid || !device->dev_stats_dirty) | |
4836 | continue; | |
4837 | ||
4838 | ret = update_dev_stat_item(trans, dev_root, device); | |
4839 | if (!ret) | |
4840 | device->dev_stats_dirty = 0; | |
4841 | } | |
4842 | mutex_unlock(&fs_devices->device_list_mutex); | |
4843 | ||
4844 | return ret; | |
4845 | } | |
4846 | ||
442a4f63 SB |
4847 | void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index) |
4848 | { | |
4849 | btrfs_dev_stat_inc(dev, index); | |
4850 | btrfs_dev_stat_print_on_error(dev); | |
4851 | } | |
4852 | ||
4853 | void btrfs_dev_stat_print_on_error(struct btrfs_device *dev) | |
4854 | { | |
733f4fbb SB |
4855 | if (!dev->dev_stats_valid) |
4856 | return; | |
606686ee | 4857 | printk_ratelimited_in_rcu(KERN_ERR |
442a4f63 | 4858 | "btrfs: bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n", |
606686ee | 4859 | rcu_str_deref(dev->name), |
442a4f63 SB |
4860 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
4861 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
4862 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
4863 | btrfs_dev_stat_read(dev, | |
4864 | BTRFS_DEV_STAT_CORRUPTION_ERRS), | |
4865 | btrfs_dev_stat_read(dev, | |
4866 | BTRFS_DEV_STAT_GENERATION_ERRS)); | |
4867 | } | |
c11d2c23 | 4868 | |
733f4fbb SB |
4869 | static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev) |
4870 | { | |
a98cdb85 SB |
4871 | int i; |
4872 | ||
4873 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
4874 | if (btrfs_dev_stat_read(dev, i) != 0) | |
4875 | break; | |
4876 | if (i == BTRFS_DEV_STAT_VALUES_MAX) | |
4877 | return; /* all values == 0, suppress message */ | |
4878 | ||
606686ee JB |
4879 | printk_in_rcu(KERN_INFO "btrfs: bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u\n", |
4880 | rcu_str_deref(dev->name), | |
733f4fbb SB |
4881 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS), |
4882 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_READ_ERRS), | |
4883 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_FLUSH_ERRS), | |
4884 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_CORRUPTION_ERRS), | |
4885 | btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
4886 | } | |
4887 | ||
c11d2c23 | 4888 | int btrfs_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 4889 | struct btrfs_ioctl_get_dev_stats *stats) |
c11d2c23 SB |
4890 | { |
4891 | struct btrfs_device *dev; | |
4892 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
4893 | int i; | |
4894 | ||
4895 | mutex_lock(&fs_devices->device_list_mutex); | |
4896 | dev = btrfs_find_device(root, stats->devid, NULL, NULL); | |
4897 | mutex_unlock(&fs_devices->device_list_mutex); | |
4898 | ||
4899 | if (!dev) { | |
4900 | printk(KERN_WARNING | |
4901 | "btrfs: get dev_stats failed, device not found\n"); | |
4902 | return -ENODEV; | |
733f4fbb SB |
4903 | } else if (!dev->dev_stats_valid) { |
4904 | printk(KERN_WARNING | |
4905 | "btrfs: get dev_stats failed, not yet valid\n"); | |
4906 | return -ENODEV; | |
b27f7c0c | 4907 | } else if (stats->flags & BTRFS_DEV_STATS_RESET) { |
c11d2c23 SB |
4908 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) { |
4909 | if (stats->nr_items > i) | |
4910 | stats->values[i] = | |
4911 | btrfs_dev_stat_read_and_reset(dev, i); | |
4912 | else | |
4913 | btrfs_dev_stat_reset(dev, i); | |
4914 | } | |
4915 | } else { | |
4916 | for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) | |
4917 | if (stats->nr_items > i) | |
4918 | stats->values[i] = btrfs_dev_stat_read(dev, i); | |
4919 | } | |
4920 | if (stats->nr_items > BTRFS_DEV_STAT_VALUES_MAX) | |
4921 | stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX; | |
4922 | return 0; | |
4923 | } |