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e93c89c1 SB |
1 | /* |
2 | * Copyright (C) STRATO AG 2012. 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> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/blkdev.h> | |
23 | #include <linux/random.h> | |
24 | #include <linux/iocontext.h> | |
25 | #include <linux/capability.h> | |
26 | #include <linux/kthread.h> | |
27 | #include <linux/math64.h> | |
28 | #include <asm/div64.h> | |
e93c89c1 SB |
29 | #include "ctree.h" |
30 | #include "extent_map.h" | |
31 | #include "disk-io.h" | |
32 | #include "transaction.h" | |
33 | #include "print-tree.h" | |
34 | #include "volumes.h" | |
35 | #include "async-thread.h" | |
36 | #include "check-integrity.h" | |
37 | #include "rcu-string.h" | |
38 | #include "dev-replace.h" | |
49c6f736 | 39 | #include "sysfs.h" |
e93c89c1 | 40 | |
e93c89c1 SB |
41 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
42 | int scrub_ret); | |
43 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
44 | struct btrfs_fs_info *fs_info, | |
45 | struct btrfs_device *srcdev, | |
46 | struct btrfs_device *tgtdev); | |
47 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, | |
48 | char *srcdev_name, | |
49 | struct btrfs_device **device); | |
50 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); | |
51 | static int btrfs_dev_replace_kthread(void *data); | |
52 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); | |
53 | ||
54 | ||
55 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
56 | { | |
57 | struct btrfs_key key; | |
58 | struct btrfs_root *dev_root = fs_info->dev_root; | |
59 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
60 | struct extent_buffer *eb; | |
61 | int slot; | |
62 | int ret = 0; | |
63 | struct btrfs_path *path = NULL; | |
64 | int item_size; | |
65 | struct btrfs_dev_replace_item *ptr; | |
66 | u64 src_devid; | |
67 | ||
68 | path = btrfs_alloc_path(); | |
69 | if (!path) { | |
70 | ret = -ENOMEM; | |
71 | goto out; | |
72 | } | |
73 | ||
74 | key.objectid = 0; | |
75 | key.type = BTRFS_DEV_REPLACE_KEY; | |
76 | key.offset = 0; | |
77 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
78 | if (ret) { | |
79 | no_valid_dev_replace_entry_found: | |
80 | ret = 0; | |
81 | dev_replace->replace_state = | |
82 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; | |
83 | dev_replace->cont_reading_from_srcdev_mode = | |
84 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
85 | dev_replace->replace_state = 0; | |
86 | dev_replace->time_started = 0; | |
87 | dev_replace->time_stopped = 0; | |
88 | atomic64_set(&dev_replace->num_write_errors, 0); | |
89 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
90 | dev_replace->cursor_left = 0; | |
91 | dev_replace->committed_cursor_left = 0; | |
92 | dev_replace->cursor_left_last_write_of_item = 0; | |
93 | dev_replace->cursor_right = 0; | |
94 | dev_replace->srcdev = NULL; | |
95 | dev_replace->tgtdev = NULL; | |
96 | dev_replace->is_valid = 0; | |
97 | dev_replace->item_needs_writeback = 0; | |
98 | goto out; | |
99 | } | |
100 | slot = path->slots[0]; | |
101 | eb = path->nodes[0]; | |
102 | item_size = btrfs_item_size_nr(eb, slot); | |
103 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); | |
104 | ||
105 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
efe120a0 FH |
106 | btrfs_warn(fs_info, |
107 | "dev_replace entry found has unexpected size, ignore entry"); | |
e93c89c1 SB |
108 | goto no_valid_dev_replace_entry_found; |
109 | } | |
110 | ||
111 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
112 | dev_replace->cont_reading_from_srcdev_mode = | |
113 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
114 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
115 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
116 | dev_replace->time_stopped = | |
117 | btrfs_dev_replace_time_stopped(eb, ptr); | |
118 | atomic64_set(&dev_replace->num_write_errors, | |
119 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
120 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
121 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
122 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
123 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
124 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
125 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
126 | dev_replace->is_valid = 1; | |
127 | ||
128 | dev_replace->item_needs_writeback = 0; | |
129 | switch (dev_replace->replace_state) { | |
130 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
131 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
132 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
133 | dev_replace->srcdev = NULL; | |
134 | dev_replace->tgtdev = NULL; | |
135 | break; | |
136 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
137 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
138 | dev_replace->srcdev = btrfs_find_device(fs_info, src_devid, | |
139 | NULL, NULL); | |
140 | dev_replace->tgtdev = btrfs_find_device(fs_info, | |
141 | BTRFS_DEV_REPLACE_DEVID, | |
142 | NULL, NULL); | |
143 | /* | |
144 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
145 | * missing | |
146 | */ | |
147 | if (!dev_replace->srcdev && | |
148 | !btrfs_test_opt(dev_root, DEGRADED)) { | |
149 | ret = -EIO; | |
efe120a0 FH |
150 | btrfs_warn(fs_info, |
151 | "cannot mount because device replace operation is ongoing and"); | |
152 | btrfs_warn(fs_info, | |
153 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
154 | src_devid); | |
e93c89c1 SB |
155 | } |
156 | if (!dev_replace->tgtdev && | |
157 | !btrfs_test_opt(dev_root, DEGRADED)) { | |
158 | ret = -EIO; | |
efe120a0 FH |
159 | btrfs_warn(fs_info, |
160 | "cannot mount because device replace operation is ongoing and"); | |
161 | btrfs_warn(fs_info, | |
162 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
6e71c47a | 163 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
164 | } |
165 | if (dev_replace->tgtdev) { | |
166 | if (dev_replace->srcdev) { | |
167 | dev_replace->tgtdev->total_bytes = | |
168 | dev_replace->srcdev->total_bytes; | |
169 | dev_replace->tgtdev->disk_total_bytes = | |
170 | dev_replace->srcdev->disk_total_bytes; | |
935e5cc9 MX |
171 | dev_replace->tgtdev->commit_total_bytes = |
172 | dev_replace->srcdev->commit_total_bytes; | |
e93c89c1 SB |
173 | dev_replace->tgtdev->bytes_used = |
174 | dev_replace->srcdev->bytes_used; | |
ce7213c7 MX |
175 | dev_replace->tgtdev->commit_bytes_used = |
176 | dev_replace->srcdev->commit_bytes_used; | |
e93c89c1 SB |
177 | } |
178 | dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1; | |
179 | btrfs_init_dev_replace_tgtdev_for_resume(fs_info, | |
180 | dev_replace->tgtdev); | |
181 | } | |
182 | break; | |
183 | } | |
184 | ||
185 | out: | |
186 | if (path) | |
187 | btrfs_free_path(path); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | /* | |
192 | * called from commit_transaction. Writes changed device replace state to | |
193 | * disk. | |
194 | */ | |
195 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans, | |
196 | struct btrfs_fs_info *fs_info) | |
197 | { | |
198 | int ret; | |
199 | struct btrfs_root *dev_root = fs_info->dev_root; | |
200 | struct btrfs_path *path; | |
201 | struct btrfs_key key; | |
202 | struct extent_buffer *eb; | |
203 | struct btrfs_dev_replace_item *ptr; | |
204 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
205 | ||
206 | btrfs_dev_replace_lock(dev_replace); | |
207 | if (!dev_replace->is_valid || | |
208 | !dev_replace->item_needs_writeback) { | |
209 | btrfs_dev_replace_unlock(dev_replace); | |
210 | return 0; | |
211 | } | |
212 | btrfs_dev_replace_unlock(dev_replace); | |
213 | ||
214 | key.objectid = 0; | |
215 | key.type = BTRFS_DEV_REPLACE_KEY; | |
216 | key.offset = 0; | |
217 | ||
218 | path = btrfs_alloc_path(); | |
219 | if (!path) { | |
220 | ret = -ENOMEM; | |
221 | goto out; | |
222 | } | |
223 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
224 | if (ret < 0) { | |
efe120a0 | 225 | btrfs_warn(fs_info, "error %d while searching for dev_replace item!", |
e93c89c1 SB |
226 | ret); |
227 | goto out; | |
228 | } | |
229 | ||
230 | if (ret == 0 && | |
231 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
232 | /* | |
233 | * need to delete old one and insert a new one. | |
234 | * Since no attempt is made to recover any old state, if the | |
235 | * dev_replace state is 'running', the data on the target | |
236 | * drive is lost. | |
237 | * It would be possible to recover the state: just make sure | |
238 | * that the beginning of the item is never changed and always | |
239 | * contains all the essential information. Then read this | |
240 | * minimal set of information and use it as a base for the | |
241 | * new state. | |
242 | */ | |
243 | ret = btrfs_del_item(trans, dev_root, path); | |
244 | if (ret != 0) { | |
efe120a0 | 245 | btrfs_warn(fs_info, "delete too small dev_replace item failed %d!", |
e93c89c1 SB |
246 | ret); |
247 | goto out; | |
248 | } | |
249 | ret = 1; | |
250 | } | |
251 | ||
252 | if (ret == 1) { | |
253 | /* need to insert a new item */ | |
254 | btrfs_release_path(path); | |
255 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
256 | &key, sizeof(*ptr)); | |
257 | if (ret < 0) { | |
efe120a0 | 258 | btrfs_warn(fs_info, "insert dev_replace item failed %d!", |
e93c89c1 SB |
259 | ret); |
260 | goto out; | |
261 | } | |
262 | } | |
263 | ||
264 | eb = path->nodes[0]; | |
265 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
266 | struct btrfs_dev_replace_item); | |
267 | ||
268 | btrfs_dev_replace_lock(dev_replace); | |
269 | if (dev_replace->srcdev) | |
270 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
271 | dev_replace->srcdev->devid); | |
272 | else | |
273 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
274 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
275 | dev_replace->cont_reading_from_srcdev_mode); | |
276 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
277 | dev_replace->replace_state); | |
278 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
279 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
280 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
281 | atomic64_read(&dev_replace->num_write_errors)); | |
282 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
283 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
284 | dev_replace->cursor_left_last_write_of_item = | |
285 | dev_replace->cursor_left; | |
286 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
287 | dev_replace->cursor_left_last_write_of_item); | |
288 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
289 | dev_replace->cursor_right); | |
290 | dev_replace->item_needs_writeback = 0; | |
291 | btrfs_dev_replace_unlock(dev_replace); | |
292 | ||
293 | btrfs_mark_buffer_dirty(eb); | |
294 | ||
295 | out: | |
296 | btrfs_free_path(path); | |
297 | ||
298 | return ret; | |
299 | } | |
300 | ||
301 | void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) | |
302 | { | |
303 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
304 | ||
305 | dev_replace->committed_cursor_left = | |
306 | dev_replace->cursor_left_last_write_of_item; | |
307 | } | |
308 | ||
e93c89c1 SB |
309 | int btrfs_dev_replace_start(struct btrfs_root *root, |
310 | struct btrfs_ioctl_dev_replace_args *args) | |
311 | { | |
312 | struct btrfs_trans_handle *trans; | |
313 | struct btrfs_fs_info *fs_info = root->fs_info; | |
314 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
315 | int ret; | |
316 | struct btrfs_device *tgt_device = NULL; | |
317 | struct btrfs_device *src_device = NULL; | |
318 | ||
49688107 | 319 | if (btrfs_fs_incompat(fs_info, RAID56)) { |
efe120a0 | 320 | btrfs_warn(fs_info, "dev_replace cannot yet handle RAID5/RAID6"); |
c81d5767 | 321 | return -EOPNOTSUPP; |
49688107 SB |
322 | } |
323 | ||
e93c89c1 SB |
324 | switch (args->start.cont_reading_from_srcdev_mode) { |
325 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
326 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
327 | break; | |
328 | default: | |
329 | return -EINVAL; | |
330 | } | |
331 | ||
332 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
333 | args->start.tgtdev_name[0] == '\0') | |
334 | return -EINVAL; | |
335 | ||
935e5cc9 MX |
336 | /* |
337 | * Here we commit the transaction to make sure commit_total_bytes | |
338 | * of all the devices are updated. | |
339 | */ | |
340 | trans = btrfs_attach_transaction(root); | |
341 | if (!IS_ERR(trans)) { | |
342 | ret = btrfs_commit_transaction(trans, root); | |
343 | if (ret) | |
344 | return ret; | |
345 | } else if (PTR_ERR(trans) != -ENOENT) { | |
346 | return PTR_ERR(trans); | |
347 | } | |
348 | ||
349 | /* the disk copy procedure reuses the scrub code */ | |
e93c89c1 | 350 | mutex_lock(&fs_info->volume_mutex); |
e93c89c1 SB |
351 | ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, |
352 | args->start.srcdev_name, | |
353 | &src_device); | |
e93c89c1 | 354 | if (ret) { |
1c43366d MX |
355 | mutex_unlock(&fs_info->volume_mutex); |
356 | return ret; | |
e93c89c1 SB |
357 | } |
358 | ||
1c43366d MX |
359 | ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, |
360 | src_device, &tgt_device); | |
361 | mutex_unlock(&fs_info->volume_mutex); | |
362 | if (ret) | |
363 | return ret; | |
e93c89c1 SB |
364 | |
365 | btrfs_dev_replace_lock(dev_replace); | |
366 | switch (dev_replace->replace_state) { | |
367 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
368 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
369 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
370 | break; | |
371 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
372 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
373 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; | |
374 | goto leave; | |
375 | } | |
376 | ||
377 | dev_replace->cont_reading_from_srcdev_mode = | |
378 | args->start.cont_reading_from_srcdev_mode; | |
379 | WARN_ON(!src_device); | |
380 | dev_replace->srcdev = src_device; | |
381 | WARN_ON(!tgt_device); | |
382 | dev_replace->tgtdev = tgt_device; | |
383 | ||
384 | printk_in_rcu(KERN_INFO | |
efe120a0 | 385 | "BTRFS: dev_replace from %s (devid %llu) to %s started\n", |
e93c89c1 SB |
386 | src_device->missing ? "<missing disk>" : |
387 | rcu_str_deref(src_device->name), | |
388 | src_device->devid, | |
389 | rcu_str_deref(tgt_device->name)); | |
390 | ||
e93c89c1 SB |
391 | /* |
392 | * from now on, the writes to the srcdev are all duplicated to | |
393 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
394 | */ | |
395 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
4546bcae | 396 | dev_replace->time_started = get_seconds(); |
e93c89c1 SB |
397 | dev_replace->cursor_left = 0; |
398 | dev_replace->committed_cursor_left = 0; | |
399 | dev_replace->cursor_left_last_write_of_item = 0; | |
400 | dev_replace->cursor_right = 0; | |
401 | dev_replace->is_valid = 1; | |
402 | dev_replace->item_needs_writeback = 1; | |
403 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
404 | btrfs_dev_replace_unlock(dev_replace); | |
405 | ||
b0244199 | 406 | btrfs_wait_ordered_roots(root->fs_info, -1); |
e93c89c1 SB |
407 | |
408 | /* force writing the updated state information to disk */ | |
409 | trans = btrfs_start_transaction(root, 0); | |
410 | if (IS_ERR(trans)) { | |
411 | ret = PTR_ERR(trans); | |
412 | btrfs_dev_replace_lock(dev_replace); | |
413 | goto leave; | |
414 | } | |
415 | ||
416 | ret = btrfs_commit_transaction(trans, root); | |
417 | WARN_ON(ret); | |
418 | ||
419 | /* the disk copy procedure reuses the scrub code */ | |
420 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 421 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
422 | &dev_replace->scrub_progress, 0, 1); |
423 | ||
424 | ret = btrfs_dev_replace_finishing(root->fs_info, ret); | |
2fc9f6ba EG |
425 | /* don't warn if EINPROGRESS, someone else might be running scrub */ |
426 | if (ret == -EINPROGRESS) { | |
427 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; | |
428 | ret = 0; | |
429 | } else { | |
430 | WARN_ON(ret); | |
431 | } | |
e93c89c1 | 432 | |
2fc9f6ba | 433 | return ret; |
e93c89c1 SB |
434 | |
435 | leave: | |
436 | dev_replace->srcdev = NULL; | |
437 | dev_replace->tgtdev = NULL; | |
438 | btrfs_dev_replace_unlock(dev_replace); | |
1c43366d | 439 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
e93c89c1 SB |
440 | return ret; |
441 | } | |
442 | ||
c404e0dc MX |
443 | /* |
444 | * blocked until all flighting bios are finished. | |
445 | */ | |
446 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
447 | { | |
448 | s64 writers; | |
449 | DEFINE_WAIT(wait); | |
450 | ||
451 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
452 | do { | |
453 | prepare_to_wait(&fs_info->replace_wait, &wait, | |
454 | TASK_UNINTERRUPTIBLE); | |
455 | writers = percpu_counter_sum(&fs_info->bio_counter); | |
456 | if (writers) | |
457 | schedule(); | |
458 | finish_wait(&fs_info->replace_wait, &wait); | |
459 | } while (writers); | |
460 | } | |
461 | ||
462 | /* | |
463 | * we have removed target device, it is safe to allow new bios request. | |
464 | */ | |
465 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
466 | { | |
467 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
468 | if (waitqueue_active(&fs_info->replace_wait)) | |
469 | wake_up(&fs_info->replace_wait); | |
470 | } | |
471 | ||
e93c89c1 SB |
472 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
473 | int scrub_ret) | |
474 | { | |
475 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
476 | struct btrfs_device *tgt_device; | |
477 | struct btrfs_device *src_device; | |
478 | struct btrfs_root *root = fs_info->tree_root; | |
479 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
480 | struct btrfs_trans_handle *trans; | |
481 | int ret = 0; | |
482 | ||
483 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
484 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
485 | ||
486 | btrfs_dev_replace_lock(dev_replace); | |
487 | /* was the operation canceled, or is it finished? */ | |
488 | if (dev_replace->replace_state != | |
489 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
490 | btrfs_dev_replace_unlock(dev_replace); | |
491 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
492 | return 0; | |
493 | } | |
494 | ||
495 | tgt_device = dev_replace->tgtdev; | |
496 | src_device = dev_replace->srcdev; | |
497 | btrfs_dev_replace_unlock(dev_replace); | |
498 | ||
e93c89c1 SB |
499 | /* |
500 | * flush all outstanding I/O and inode extent mappings before the | |
501 | * copy operation is declared as being finished | |
502 | */ | |
6c255e67 | 503 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
3edb2a68 MX |
504 | if (ret) { |
505 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
506 | return ret; | |
507 | } | |
b0244199 | 508 | btrfs_wait_ordered_roots(root->fs_info, -1); |
e93c89c1 SB |
509 | |
510 | trans = btrfs_start_transaction(root, 0); | |
511 | if (IS_ERR(trans)) { | |
512 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
513 | return PTR_ERR(trans); | |
514 | } | |
515 | ret = btrfs_commit_transaction(trans, root); | |
516 | WARN_ON(ret); | |
517 | ||
67a2c45e | 518 | mutex_lock(&uuid_mutex); |
e93c89c1 SB |
519 | /* keep away write_all_supers() during the finishing procedure */ |
520 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2196d6e8 | 521 | mutex_lock(&root->fs_info->chunk_mutex); |
e93c89c1 SB |
522 | btrfs_dev_replace_lock(dev_replace); |
523 | dev_replace->replace_state = | |
524 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
525 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
526 | dev_replace->tgtdev = NULL; | |
527 | dev_replace->srcdev = NULL; | |
4546bcae | 528 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
529 | dev_replace->item_needs_writeback = 1; |
530 | ||
c404e0dc MX |
531 | /* replace old device with new one in mapping tree */ |
532 | if (!scrub_ret) { | |
533 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, | |
534 | src_device, | |
535 | tgt_device); | |
536 | } else { | |
e93c89c1 | 537 | printk_in_rcu(KERN_ERR |
efe120a0 | 538 | "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n", |
e93c89c1 SB |
539 | src_device->missing ? "<missing disk>" : |
540 | rcu_str_deref(src_device->name), | |
541 | src_device->devid, | |
542 | rcu_str_deref(tgt_device->name), scrub_ret); | |
543 | btrfs_dev_replace_unlock(dev_replace); | |
391cd9df | 544 | mutex_unlock(&root->fs_info->chunk_mutex); |
2196d6e8 | 545 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
67a2c45e | 546 | mutex_unlock(&uuid_mutex); |
e93c89c1 SB |
547 | if (tgt_device) |
548 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
549 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
550 | ||
2fc9f6ba | 551 | return scrub_ret; |
e93c89c1 SB |
552 | } |
553 | ||
554 | printk_in_rcu(KERN_INFO | |
de4c296f | 555 | "BTRFS: dev_replace from %s (devid %llu) to %s finished\n", |
e93c89c1 SB |
556 | src_device->missing ? "<missing disk>" : |
557 | rcu_str_deref(src_device->name), | |
558 | src_device->devid, | |
559 | rcu_str_deref(tgt_device->name)); | |
560 | tgt_device->is_tgtdev_for_dev_replace = 0; | |
561 | tgt_device->devid = src_device->devid; | |
562 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
563 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
564 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
565 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
566 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
567 | btrfs_device_set_disk_total_bytes(tgt_device, | |
568 | src_device->disk_total_bytes); | |
569 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
935e5cc9 MX |
570 | ASSERT(list_empty(&src_device->resized_list)); |
571 | tgt_device->commit_total_bytes = src_device->commit_total_bytes; | |
ce7213c7 | 572 | tgt_device->commit_bytes_used = src_device->bytes_used; |
e93c89c1 SB |
573 | if (fs_info->sb->s_bdev == src_device->bdev) |
574 | fs_info->sb->s_bdev = tgt_device->bdev; | |
575 | if (fs_info->fs_devices->latest_bdev == src_device->bdev) | |
576 | fs_info->fs_devices->latest_bdev = tgt_device->bdev; | |
577 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); | |
82372bc8 | 578 | fs_info->fs_devices->rw_devices++; |
e93c89c1 | 579 | |
12b894cb QW |
580 | btrfs_dev_replace_unlock(dev_replace); |
581 | ||
c404e0dc MX |
582 | btrfs_rm_dev_replace_blocked(fs_info); |
583 | ||
084b6e7c | 584 | btrfs_rm_dev_replace_remove_srcdev(fs_info, src_device); |
1357272f | 585 | |
c404e0dc MX |
586 | btrfs_rm_dev_replace_unblocked(fs_info); |
587 | ||
e93c89c1 SB |
588 | /* |
589 | * this is again a consistent state where no dev_replace procedure | |
590 | * is running, the target device is part of the filesystem, the | |
591 | * source device is not part of the filesystem anymore and its 1st | |
592 | * superblock is scratched out so that it is no longer marked to | |
593 | * belong to this filesystem. | |
594 | */ | |
391cd9df | 595 | mutex_unlock(&root->fs_info->chunk_mutex); |
2196d6e8 | 596 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
67a2c45e | 597 | mutex_unlock(&uuid_mutex); |
e93c89c1 | 598 | |
084b6e7c QW |
599 | /* replace the sysfs entry */ |
600 | btrfs_kobj_rm_device(fs_info, src_device); | |
601 | btrfs_kobj_add_device(fs_info, tgt_device); | |
602 | btrfs_rm_dev_replace_free_srcdev(fs_info, src_device); | |
603 | ||
e93c89c1 SB |
604 | /* write back the superblocks */ |
605 | trans = btrfs_start_transaction(root, 0); | |
606 | if (!IS_ERR(trans)) | |
607 | btrfs_commit_transaction(trans, root); | |
608 | ||
609 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
615 | struct btrfs_fs_info *fs_info, | |
616 | struct btrfs_device *srcdev, | |
617 | struct btrfs_device *tgtdev) | |
618 | { | |
619 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; | |
620 | struct extent_map *em; | |
621 | struct map_lookup *map; | |
622 | u64 start = 0; | |
623 | int i; | |
624 | ||
625 | write_lock(&em_tree->lock); | |
626 | do { | |
627 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
628 | if (!em) | |
629 | break; | |
630 | map = (struct map_lookup *)em->bdev; | |
631 | for (i = 0; i < map->num_stripes; i++) | |
632 | if (srcdev == map->stripes[i].dev) | |
633 | map->stripes[i].dev = tgtdev; | |
634 | start = em->start + em->len; | |
635 | free_extent_map(em); | |
636 | } while (start); | |
637 | write_unlock(&em_tree->lock); | |
638 | } | |
639 | ||
640 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, | |
641 | char *srcdev_name, | |
642 | struct btrfs_device **device) | |
643 | { | |
644 | int ret; | |
645 | ||
646 | if (srcdevid) { | |
647 | ret = 0; | |
648 | *device = btrfs_find_device(root->fs_info, srcdevid, NULL, | |
649 | NULL); | |
650 | if (!*device) | |
651 | ret = -ENOENT; | |
652 | } else { | |
653 | ret = btrfs_find_device_missing_or_by_path(root, srcdev_name, | |
654 | device); | |
655 | } | |
656 | return ret; | |
657 | } | |
658 | ||
659 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, | |
660 | struct btrfs_ioctl_dev_replace_args *args) | |
661 | { | |
662 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
7cc8e58d | 663 | struct btrfs_device *srcdev; |
e93c89c1 SB |
664 | |
665 | btrfs_dev_replace_lock(dev_replace); | |
666 | /* even if !dev_replace_is_valid, the values are good enough for | |
667 | * the replace_status ioctl */ | |
668 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
669 | args->status.replace_state = dev_replace->replace_state; | |
670 | args->status.time_started = dev_replace->time_started; | |
671 | args->status.time_stopped = dev_replace->time_stopped; | |
672 | args->status.num_write_errors = | |
673 | atomic64_read(&dev_replace->num_write_errors); | |
674 | args->status.num_uncorrectable_read_errors = | |
675 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
676 | switch (dev_replace->replace_state) { | |
677 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
678 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
679 | args->status.progress_1000 = 0; | |
680 | break; | |
681 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
682 | args->status.progress_1000 = 1000; | |
683 | break; | |
684 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
685 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
7cc8e58d | 686 | srcdev = dev_replace->srcdev; |
e93c89c1 | 687 | args->status.progress_1000 = div64_u64(dev_replace->cursor_left, |
7cc8e58d | 688 | div64_u64(btrfs_device_get_total_bytes(srcdev), 1000)); |
e93c89c1 SB |
689 | break; |
690 | } | |
691 | btrfs_dev_replace_unlock(dev_replace); | |
692 | } | |
693 | ||
694 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, | |
695 | struct btrfs_ioctl_dev_replace_args *args) | |
696 | { | |
697 | args->result = __btrfs_dev_replace_cancel(fs_info); | |
698 | return 0; | |
699 | } | |
700 | ||
701 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) | |
702 | { | |
703 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
704 | struct btrfs_device *tgt_device = NULL; | |
705 | struct btrfs_trans_handle *trans; | |
706 | struct btrfs_root *root = fs_info->tree_root; | |
707 | u64 result; | |
708 | int ret; | |
709 | ||
e649e587 ID |
710 | if (fs_info->sb->s_flags & MS_RDONLY) |
711 | return -EROFS; | |
712 | ||
e93c89c1 SB |
713 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
714 | btrfs_dev_replace_lock(dev_replace); | |
715 | switch (dev_replace->replace_state) { | |
716 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
717 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
718 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
719 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
720 | btrfs_dev_replace_unlock(dev_replace); | |
721 | goto leave; | |
722 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
723 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
724 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
725 | tgt_device = dev_replace->tgtdev; | |
726 | dev_replace->tgtdev = NULL; | |
727 | dev_replace->srcdev = NULL; | |
728 | break; | |
729 | } | |
730 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
4546bcae | 731 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
732 | dev_replace->item_needs_writeback = 1; |
733 | btrfs_dev_replace_unlock(dev_replace); | |
734 | btrfs_scrub_cancel(fs_info); | |
735 | ||
736 | trans = btrfs_start_transaction(root, 0); | |
737 | if (IS_ERR(trans)) { | |
738 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
739 | return PTR_ERR(trans); | |
740 | } | |
741 | ret = btrfs_commit_transaction(trans, root); | |
742 | WARN_ON(ret); | |
743 | if (tgt_device) | |
744 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
745 | ||
746 | leave: | |
747 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
748 | return result; | |
749 | } | |
750 | ||
751 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
752 | { | |
753 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
754 | ||
755 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
756 | btrfs_dev_replace_lock(dev_replace); | |
757 | switch (dev_replace->replace_state) { | |
758 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
759 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
760 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
761 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
762 | break; | |
763 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
764 | dev_replace->replace_state = | |
765 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
4546bcae | 766 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 | 767 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 768 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
769 | break; |
770 | } | |
771 | ||
772 | btrfs_dev_replace_unlock(dev_replace); | |
773 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
774 | } | |
775 | ||
776 | /* resume dev_replace procedure that was interrupted by unmount */ | |
777 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
778 | { | |
779 | struct task_struct *task; | |
780 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
781 | ||
782 | btrfs_dev_replace_lock(dev_replace); | |
783 | switch (dev_replace->replace_state) { | |
784 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
785 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
786 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
787 | btrfs_dev_replace_unlock(dev_replace); | |
788 | return 0; | |
789 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
790 | break; | |
791 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
792 | dev_replace->replace_state = | |
793 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
794 | break; | |
795 | } | |
796 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 FH |
797 | btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing"); |
798 | btrfs_info(fs_info, | |
799 | "you may cancel the operation after 'mount -o degraded'"); | |
e93c89c1 SB |
800 | btrfs_dev_replace_unlock(dev_replace); |
801 | return 0; | |
802 | } | |
803 | btrfs_dev_replace_unlock(dev_replace); | |
804 | ||
805 | WARN_ON(atomic_xchg( | |
806 | &fs_info->mutually_exclusive_operation_running, 1)); | |
807 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); | |
8c6ffba0 | 808 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
809 | } |
810 | ||
811 | static int btrfs_dev_replace_kthread(void *data) | |
812 | { | |
813 | struct btrfs_fs_info *fs_info = data; | |
814 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
815 | struct btrfs_ioctl_dev_replace_args *status_args; | |
816 | u64 progress; | |
817 | ||
818 | status_args = kzalloc(sizeof(*status_args), GFP_NOFS); | |
819 | if (status_args) { | |
820 | btrfs_dev_replace_status(fs_info, status_args); | |
821 | progress = status_args->status.progress_1000; | |
822 | kfree(status_args); | |
823 | do_div(progress, 10); | |
824 | printk_in_rcu(KERN_INFO | |
efe120a0 FH |
825 | "BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n", |
826 | dev_replace->srcdev->missing ? "<missing disk>" : | |
827 | rcu_str_deref(dev_replace->srcdev->name), | |
828 | dev_replace->srcdev->devid, | |
829 | dev_replace->tgtdev ? | |
830 | rcu_str_deref(dev_replace->tgtdev->name) : | |
831 | "<missing target disk>", | |
832 | (unsigned int)progress); | |
e93c89c1 SB |
833 | } |
834 | btrfs_dev_replace_continue_on_mount(fs_info); | |
835 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
836 | ||
837 | return 0; | |
838 | } | |
839 | ||
840 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) | |
841 | { | |
842 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
843 | int ret; | |
844 | ||
845 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, | |
846 | dev_replace->committed_cursor_left, | |
7cc8e58d | 847 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
848 | &dev_replace->scrub_progress, 0, 1); |
849 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
850 | WARN_ON(ret); | |
851 | return 0; | |
852 | } | |
853 | ||
854 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) | |
855 | { | |
856 | if (!dev_replace->is_valid) | |
857 | return 0; | |
858 | ||
859 | switch (dev_replace->replace_state) { | |
860 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
861 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
862 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
863 | return 0; | |
864 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
865 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
866 | /* | |
867 | * return true even if tgtdev is missing (this is | |
868 | * something that can happen if the dev_replace | |
869 | * procedure is suspended by an umount and then | |
870 | * the tgtdev is missing (or "btrfs dev scan") was | |
871 | * not called and the the filesystem is remounted | |
872 | * in degraded state. This does not stop the | |
873 | * dev_replace procedure. It needs to be canceled | |
874 | * manually if the cancelation is wanted. | |
875 | */ | |
876 | break; | |
877 | } | |
878 | return 1; | |
879 | } | |
880 | ||
881 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace) | |
882 | { | |
883 | /* the beginning is just an optimization for the typical case */ | |
884 | if (atomic_read(&dev_replace->nesting_level) == 0) { | |
885 | acquire_lock: | |
886 | /* this is not a nested case where the same thread | |
887 | * is trying to acqurire the same lock twice */ | |
888 | mutex_lock(&dev_replace->lock); | |
889 | mutex_lock(&dev_replace->lock_management_lock); | |
890 | dev_replace->lock_owner = current->pid; | |
891 | atomic_inc(&dev_replace->nesting_level); | |
892 | mutex_unlock(&dev_replace->lock_management_lock); | |
893 | return; | |
894 | } | |
895 | ||
896 | mutex_lock(&dev_replace->lock_management_lock); | |
897 | if (atomic_read(&dev_replace->nesting_level) > 0 && | |
898 | dev_replace->lock_owner == current->pid) { | |
899 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); | |
900 | atomic_inc(&dev_replace->nesting_level); | |
901 | mutex_unlock(&dev_replace->lock_management_lock); | |
902 | return; | |
903 | } | |
904 | ||
905 | mutex_unlock(&dev_replace->lock_management_lock); | |
906 | goto acquire_lock; | |
907 | } | |
908 | ||
909 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace) | |
910 | { | |
911 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); | |
912 | mutex_lock(&dev_replace->lock_management_lock); | |
913 | WARN_ON(atomic_read(&dev_replace->nesting_level) < 1); | |
914 | WARN_ON(dev_replace->lock_owner != current->pid); | |
915 | atomic_dec(&dev_replace->nesting_level); | |
916 | if (atomic_read(&dev_replace->nesting_level) == 0) { | |
917 | dev_replace->lock_owner = 0; | |
918 | mutex_unlock(&dev_replace->lock_management_lock); | |
919 | mutex_unlock(&dev_replace->lock); | |
920 | } else { | |
921 | mutex_unlock(&dev_replace->lock_management_lock); | |
922 | } | |
923 | } | |
c404e0dc MX |
924 | |
925 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) | |
926 | { | |
927 | percpu_counter_inc(&fs_info->bio_counter); | |
928 | } | |
929 | ||
930 | void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info) | |
931 | { | |
932 | percpu_counter_dec(&fs_info->bio_counter); | |
933 | ||
934 | if (waitqueue_active(&fs_info->replace_wait)) | |
935 | wake_up(&fs_info->replace_wait); | |
936 | } | |
937 | ||
938 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
939 | { | |
940 | DEFINE_WAIT(wait); | |
941 | again: | |
942 | percpu_counter_inc(&fs_info->bio_counter); | |
943 | if (test_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state)) { | |
944 | btrfs_bio_counter_dec(fs_info); | |
945 | wait_event(fs_info->replace_wait, | |
946 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, | |
947 | &fs_info->fs_state)); | |
948 | goto again; | |
949 | } | |
950 | ||
951 | } |