Commit | Line | Data |
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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 | ||
319 | switch (args->start.cont_reading_from_srcdev_mode) { | |
320 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
321 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
322 | break; | |
323 | default: | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
327 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
328 | args->start.tgtdev_name[0] == '\0') | |
329 | return -EINVAL; | |
330 | ||
935e5cc9 MX |
331 | /* |
332 | * Here we commit the transaction to make sure commit_total_bytes | |
333 | * of all the devices are updated. | |
334 | */ | |
335 | trans = btrfs_attach_transaction(root); | |
336 | if (!IS_ERR(trans)) { | |
337 | ret = btrfs_commit_transaction(trans, root); | |
338 | if (ret) | |
339 | return ret; | |
340 | } else if (PTR_ERR(trans) != -ENOENT) { | |
341 | return PTR_ERR(trans); | |
342 | } | |
343 | ||
344 | /* the disk copy procedure reuses the scrub code */ | |
e93c89c1 | 345 | mutex_lock(&fs_info->volume_mutex); |
e93c89c1 SB |
346 | ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, |
347 | args->start.srcdev_name, | |
348 | &src_device); | |
e93c89c1 | 349 | if (ret) { |
1c43366d MX |
350 | mutex_unlock(&fs_info->volume_mutex); |
351 | return ret; | |
e93c89c1 SB |
352 | } |
353 | ||
1c43366d MX |
354 | ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, |
355 | src_device, &tgt_device); | |
356 | mutex_unlock(&fs_info->volume_mutex); | |
357 | if (ret) | |
358 | return ret; | |
e93c89c1 SB |
359 | |
360 | btrfs_dev_replace_lock(dev_replace); | |
361 | switch (dev_replace->replace_state) { | |
362 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
363 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
364 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
365 | break; | |
366 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
367 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
368 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; | |
369 | goto leave; | |
370 | } | |
371 | ||
372 | dev_replace->cont_reading_from_srcdev_mode = | |
373 | args->start.cont_reading_from_srcdev_mode; | |
374 | WARN_ON(!src_device); | |
375 | dev_replace->srcdev = src_device; | |
376 | WARN_ON(!tgt_device); | |
377 | dev_replace->tgtdev = tgt_device; | |
378 | ||
379 | printk_in_rcu(KERN_INFO | |
efe120a0 | 380 | "BTRFS: dev_replace from %s (devid %llu) to %s started\n", |
e93c89c1 SB |
381 | src_device->missing ? "<missing disk>" : |
382 | rcu_str_deref(src_device->name), | |
383 | src_device->devid, | |
384 | rcu_str_deref(tgt_device->name)); | |
385 | ||
e93c89c1 SB |
386 | /* |
387 | * from now on, the writes to the srcdev are all duplicated to | |
388 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
389 | */ | |
390 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
4546bcae | 391 | dev_replace->time_started = get_seconds(); |
e93c89c1 SB |
392 | dev_replace->cursor_left = 0; |
393 | dev_replace->committed_cursor_left = 0; | |
394 | dev_replace->cursor_left_last_write_of_item = 0; | |
395 | dev_replace->cursor_right = 0; | |
396 | dev_replace->is_valid = 1; | |
397 | dev_replace->item_needs_writeback = 1; | |
398 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
399 | btrfs_dev_replace_unlock(dev_replace); | |
400 | ||
b0244199 | 401 | btrfs_wait_ordered_roots(root->fs_info, -1); |
e93c89c1 SB |
402 | |
403 | /* force writing the updated state information to disk */ | |
404 | trans = btrfs_start_transaction(root, 0); | |
405 | if (IS_ERR(trans)) { | |
406 | ret = PTR_ERR(trans); | |
407 | btrfs_dev_replace_lock(dev_replace); | |
408 | goto leave; | |
409 | } | |
410 | ||
411 | ret = btrfs_commit_transaction(trans, root); | |
412 | WARN_ON(ret); | |
413 | ||
414 | /* the disk copy procedure reuses the scrub code */ | |
415 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 416 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
417 | &dev_replace->scrub_progress, 0, 1); |
418 | ||
419 | ret = btrfs_dev_replace_finishing(root->fs_info, ret); | |
2fc9f6ba EG |
420 | /* don't warn if EINPROGRESS, someone else might be running scrub */ |
421 | if (ret == -EINPROGRESS) { | |
422 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; | |
423 | ret = 0; | |
424 | } else { | |
425 | WARN_ON(ret); | |
426 | } | |
e93c89c1 | 427 | |
2fc9f6ba | 428 | return ret; |
e93c89c1 SB |
429 | |
430 | leave: | |
431 | dev_replace->srcdev = NULL; | |
432 | dev_replace->tgtdev = NULL; | |
433 | btrfs_dev_replace_unlock(dev_replace); | |
1c43366d | 434 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
e93c89c1 SB |
435 | return ret; |
436 | } | |
437 | ||
c404e0dc MX |
438 | /* |
439 | * blocked until all flighting bios are finished. | |
440 | */ | |
441 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
442 | { | |
443 | s64 writers; | |
444 | DEFINE_WAIT(wait); | |
445 | ||
446 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
447 | do { | |
448 | prepare_to_wait(&fs_info->replace_wait, &wait, | |
449 | TASK_UNINTERRUPTIBLE); | |
450 | writers = percpu_counter_sum(&fs_info->bio_counter); | |
451 | if (writers) | |
452 | schedule(); | |
453 | finish_wait(&fs_info->replace_wait, &wait); | |
454 | } while (writers); | |
455 | } | |
456 | ||
457 | /* | |
458 | * we have removed target device, it is safe to allow new bios request. | |
459 | */ | |
460 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
461 | { | |
462 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
463 | if (waitqueue_active(&fs_info->replace_wait)) | |
464 | wake_up(&fs_info->replace_wait); | |
465 | } | |
466 | ||
e93c89c1 SB |
467 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
468 | int scrub_ret) | |
469 | { | |
470 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
471 | struct btrfs_device *tgt_device; | |
472 | struct btrfs_device *src_device; | |
473 | struct btrfs_root *root = fs_info->tree_root; | |
474 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
475 | struct btrfs_trans_handle *trans; | |
476 | int ret = 0; | |
477 | ||
478 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
479 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
480 | ||
481 | btrfs_dev_replace_lock(dev_replace); | |
482 | /* was the operation canceled, or is it finished? */ | |
483 | if (dev_replace->replace_state != | |
484 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
485 | btrfs_dev_replace_unlock(dev_replace); | |
486 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
487 | return 0; | |
488 | } | |
489 | ||
490 | tgt_device = dev_replace->tgtdev; | |
491 | src_device = dev_replace->srcdev; | |
492 | btrfs_dev_replace_unlock(dev_replace); | |
493 | ||
e93c89c1 SB |
494 | /* |
495 | * flush all outstanding I/O and inode extent mappings before the | |
496 | * copy operation is declared as being finished | |
497 | */ | |
6c255e67 | 498 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
3edb2a68 MX |
499 | if (ret) { |
500 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
501 | return ret; | |
502 | } | |
b0244199 | 503 | btrfs_wait_ordered_roots(root->fs_info, -1); |
e93c89c1 SB |
504 | |
505 | trans = btrfs_start_transaction(root, 0); | |
506 | if (IS_ERR(trans)) { | |
507 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
508 | return PTR_ERR(trans); | |
509 | } | |
510 | ret = btrfs_commit_transaction(trans, root); | |
511 | WARN_ON(ret); | |
512 | ||
67a2c45e | 513 | mutex_lock(&uuid_mutex); |
e93c89c1 SB |
514 | /* keep away write_all_supers() during the finishing procedure */ |
515 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2196d6e8 | 516 | mutex_lock(&root->fs_info->chunk_mutex); |
e93c89c1 SB |
517 | btrfs_dev_replace_lock(dev_replace); |
518 | dev_replace->replace_state = | |
519 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
520 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
521 | dev_replace->tgtdev = NULL; | |
522 | dev_replace->srcdev = NULL; | |
4546bcae | 523 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
524 | dev_replace->item_needs_writeback = 1; |
525 | ||
c404e0dc MX |
526 | /* replace old device with new one in mapping tree */ |
527 | if (!scrub_ret) { | |
528 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, | |
529 | src_device, | |
530 | tgt_device); | |
531 | } else { | |
e93c89c1 | 532 | printk_in_rcu(KERN_ERR |
efe120a0 | 533 | "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n", |
e93c89c1 SB |
534 | src_device->missing ? "<missing disk>" : |
535 | rcu_str_deref(src_device->name), | |
536 | src_device->devid, | |
537 | rcu_str_deref(tgt_device->name), scrub_ret); | |
538 | btrfs_dev_replace_unlock(dev_replace); | |
391cd9df | 539 | mutex_unlock(&root->fs_info->chunk_mutex); |
2196d6e8 | 540 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
67a2c45e | 541 | mutex_unlock(&uuid_mutex); |
e93c89c1 SB |
542 | if (tgt_device) |
543 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
544 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
545 | ||
2fc9f6ba | 546 | return scrub_ret; |
e93c89c1 SB |
547 | } |
548 | ||
549 | printk_in_rcu(KERN_INFO | |
de4c296f | 550 | "BTRFS: dev_replace from %s (devid %llu) to %s finished\n", |
e93c89c1 SB |
551 | src_device->missing ? "<missing disk>" : |
552 | rcu_str_deref(src_device->name), | |
553 | src_device->devid, | |
554 | rcu_str_deref(tgt_device->name)); | |
555 | tgt_device->is_tgtdev_for_dev_replace = 0; | |
556 | tgt_device->devid = src_device->devid; | |
557 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
558 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
559 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
560 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
561 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
562 | btrfs_device_set_disk_total_bytes(tgt_device, | |
563 | src_device->disk_total_bytes); | |
564 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
935e5cc9 MX |
565 | ASSERT(list_empty(&src_device->resized_list)); |
566 | tgt_device->commit_total_bytes = src_device->commit_total_bytes; | |
ce7213c7 | 567 | tgt_device->commit_bytes_used = src_device->bytes_used; |
e93c89c1 SB |
568 | if (fs_info->sb->s_bdev == src_device->bdev) |
569 | fs_info->sb->s_bdev = tgt_device->bdev; | |
570 | if (fs_info->fs_devices->latest_bdev == src_device->bdev) | |
571 | fs_info->fs_devices->latest_bdev = tgt_device->bdev; | |
572 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); | |
82372bc8 | 573 | fs_info->fs_devices->rw_devices++; |
e93c89c1 | 574 | |
12b894cb QW |
575 | btrfs_dev_replace_unlock(dev_replace); |
576 | ||
c404e0dc MX |
577 | btrfs_rm_dev_replace_blocked(fs_info); |
578 | ||
084b6e7c | 579 | btrfs_rm_dev_replace_remove_srcdev(fs_info, src_device); |
1357272f | 580 | |
c404e0dc MX |
581 | btrfs_rm_dev_replace_unblocked(fs_info); |
582 | ||
e93c89c1 SB |
583 | /* |
584 | * this is again a consistent state where no dev_replace procedure | |
585 | * is running, the target device is part of the filesystem, the | |
586 | * source device is not part of the filesystem anymore and its 1st | |
587 | * superblock is scratched out so that it is no longer marked to | |
588 | * belong to this filesystem. | |
589 | */ | |
391cd9df | 590 | mutex_unlock(&root->fs_info->chunk_mutex); |
2196d6e8 | 591 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
67a2c45e | 592 | mutex_unlock(&uuid_mutex); |
e93c89c1 | 593 | |
084b6e7c QW |
594 | /* replace the sysfs entry */ |
595 | btrfs_kobj_rm_device(fs_info, src_device); | |
596 | btrfs_kobj_add_device(fs_info, tgt_device); | |
597 | btrfs_rm_dev_replace_free_srcdev(fs_info, src_device); | |
598 | ||
e93c89c1 SB |
599 | /* write back the superblocks */ |
600 | trans = btrfs_start_transaction(root, 0); | |
601 | if (!IS_ERR(trans)) | |
602 | btrfs_commit_transaction(trans, root); | |
603 | ||
604 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
609 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
610 | struct btrfs_fs_info *fs_info, | |
611 | struct btrfs_device *srcdev, | |
612 | struct btrfs_device *tgtdev) | |
613 | { | |
614 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; | |
615 | struct extent_map *em; | |
616 | struct map_lookup *map; | |
617 | u64 start = 0; | |
618 | int i; | |
619 | ||
620 | write_lock(&em_tree->lock); | |
621 | do { | |
622 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
623 | if (!em) | |
624 | break; | |
625 | map = (struct map_lookup *)em->bdev; | |
626 | for (i = 0; i < map->num_stripes; i++) | |
627 | if (srcdev == map->stripes[i].dev) | |
628 | map->stripes[i].dev = tgtdev; | |
629 | start = em->start + em->len; | |
630 | free_extent_map(em); | |
631 | } while (start); | |
632 | write_unlock(&em_tree->lock); | |
633 | } | |
634 | ||
635 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, | |
636 | char *srcdev_name, | |
637 | struct btrfs_device **device) | |
638 | { | |
639 | int ret; | |
640 | ||
641 | if (srcdevid) { | |
642 | ret = 0; | |
643 | *device = btrfs_find_device(root->fs_info, srcdevid, NULL, | |
644 | NULL); | |
645 | if (!*device) | |
646 | ret = -ENOENT; | |
647 | } else { | |
648 | ret = btrfs_find_device_missing_or_by_path(root, srcdev_name, | |
649 | device); | |
650 | } | |
651 | return ret; | |
652 | } | |
653 | ||
654 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, | |
655 | struct btrfs_ioctl_dev_replace_args *args) | |
656 | { | |
657 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
7cc8e58d | 658 | struct btrfs_device *srcdev; |
e93c89c1 SB |
659 | |
660 | btrfs_dev_replace_lock(dev_replace); | |
661 | /* even if !dev_replace_is_valid, the values are good enough for | |
662 | * the replace_status ioctl */ | |
663 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
664 | args->status.replace_state = dev_replace->replace_state; | |
665 | args->status.time_started = dev_replace->time_started; | |
666 | args->status.time_stopped = dev_replace->time_stopped; | |
667 | args->status.num_write_errors = | |
668 | atomic64_read(&dev_replace->num_write_errors); | |
669 | args->status.num_uncorrectable_read_errors = | |
670 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
671 | switch (dev_replace->replace_state) { | |
672 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
673 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
674 | args->status.progress_1000 = 0; | |
675 | break; | |
676 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
677 | args->status.progress_1000 = 1000; | |
678 | break; | |
679 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
680 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
7cc8e58d | 681 | srcdev = dev_replace->srcdev; |
e93c89c1 | 682 | args->status.progress_1000 = div64_u64(dev_replace->cursor_left, |
7cc8e58d | 683 | div64_u64(btrfs_device_get_total_bytes(srcdev), 1000)); |
e93c89c1 SB |
684 | break; |
685 | } | |
686 | btrfs_dev_replace_unlock(dev_replace); | |
687 | } | |
688 | ||
689 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, | |
690 | struct btrfs_ioctl_dev_replace_args *args) | |
691 | { | |
692 | args->result = __btrfs_dev_replace_cancel(fs_info); | |
693 | return 0; | |
694 | } | |
695 | ||
696 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) | |
697 | { | |
698 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
699 | struct btrfs_device *tgt_device = NULL; | |
700 | struct btrfs_trans_handle *trans; | |
701 | struct btrfs_root *root = fs_info->tree_root; | |
702 | u64 result; | |
703 | int ret; | |
704 | ||
e649e587 ID |
705 | if (fs_info->sb->s_flags & MS_RDONLY) |
706 | return -EROFS; | |
707 | ||
e93c89c1 SB |
708 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
709 | btrfs_dev_replace_lock(dev_replace); | |
710 | switch (dev_replace->replace_state) { | |
711 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
712 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
713 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
714 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
715 | btrfs_dev_replace_unlock(dev_replace); | |
716 | goto leave; | |
717 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
718 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
719 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
720 | tgt_device = dev_replace->tgtdev; | |
721 | dev_replace->tgtdev = NULL; | |
722 | dev_replace->srcdev = NULL; | |
723 | break; | |
724 | } | |
725 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
4546bcae | 726 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
727 | dev_replace->item_needs_writeback = 1; |
728 | btrfs_dev_replace_unlock(dev_replace); | |
729 | btrfs_scrub_cancel(fs_info); | |
730 | ||
731 | trans = btrfs_start_transaction(root, 0); | |
732 | if (IS_ERR(trans)) { | |
733 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
734 | return PTR_ERR(trans); | |
735 | } | |
736 | ret = btrfs_commit_transaction(trans, root); | |
737 | WARN_ON(ret); | |
738 | if (tgt_device) | |
739 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
740 | ||
741 | leave: | |
742 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
743 | return result; | |
744 | } | |
745 | ||
746 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
747 | { | |
748 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
749 | ||
750 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
751 | btrfs_dev_replace_lock(dev_replace); | |
752 | switch (dev_replace->replace_state) { | |
753 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
754 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
755 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
756 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
757 | break; | |
758 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
759 | dev_replace->replace_state = | |
760 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
4546bcae | 761 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 | 762 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 763 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
764 | break; |
765 | } | |
766 | ||
767 | btrfs_dev_replace_unlock(dev_replace); | |
768 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
769 | } | |
770 | ||
771 | /* resume dev_replace procedure that was interrupted by unmount */ | |
772 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
773 | { | |
774 | struct task_struct *task; | |
775 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
776 | ||
777 | btrfs_dev_replace_lock(dev_replace); | |
778 | switch (dev_replace->replace_state) { | |
779 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
780 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
781 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
782 | btrfs_dev_replace_unlock(dev_replace); | |
783 | return 0; | |
784 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
785 | break; | |
786 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
787 | dev_replace->replace_state = | |
788 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
789 | break; | |
790 | } | |
791 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 FH |
792 | btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing"); |
793 | btrfs_info(fs_info, | |
794 | "you may cancel the operation after 'mount -o degraded'"); | |
e93c89c1 SB |
795 | btrfs_dev_replace_unlock(dev_replace); |
796 | return 0; | |
797 | } | |
798 | btrfs_dev_replace_unlock(dev_replace); | |
799 | ||
800 | WARN_ON(atomic_xchg( | |
801 | &fs_info->mutually_exclusive_operation_running, 1)); | |
802 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); | |
8c6ffba0 | 803 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
804 | } |
805 | ||
806 | static int btrfs_dev_replace_kthread(void *data) | |
807 | { | |
808 | struct btrfs_fs_info *fs_info = data; | |
809 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
810 | struct btrfs_ioctl_dev_replace_args *status_args; | |
811 | u64 progress; | |
812 | ||
813 | status_args = kzalloc(sizeof(*status_args), GFP_NOFS); | |
814 | if (status_args) { | |
815 | btrfs_dev_replace_status(fs_info, status_args); | |
816 | progress = status_args->status.progress_1000; | |
817 | kfree(status_args); | |
818 | do_div(progress, 10); | |
819 | printk_in_rcu(KERN_INFO | |
efe120a0 FH |
820 | "BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n", |
821 | dev_replace->srcdev->missing ? "<missing disk>" : | |
822 | rcu_str_deref(dev_replace->srcdev->name), | |
823 | dev_replace->srcdev->devid, | |
824 | dev_replace->tgtdev ? | |
825 | rcu_str_deref(dev_replace->tgtdev->name) : | |
826 | "<missing target disk>", | |
827 | (unsigned int)progress); | |
e93c89c1 SB |
828 | } |
829 | btrfs_dev_replace_continue_on_mount(fs_info); | |
830 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
835 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) | |
836 | { | |
837 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
838 | int ret; | |
839 | ||
840 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, | |
841 | dev_replace->committed_cursor_left, | |
7cc8e58d | 842 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
843 | &dev_replace->scrub_progress, 0, 1); |
844 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
845 | WARN_ON(ret); | |
846 | return 0; | |
847 | } | |
848 | ||
849 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) | |
850 | { | |
851 | if (!dev_replace->is_valid) | |
852 | return 0; | |
853 | ||
854 | switch (dev_replace->replace_state) { | |
855 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
856 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
857 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
858 | return 0; | |
859 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
860 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
861 | /* | |
862 | * return true even if tgtdev is missing (this is | |
863 | * something that can happen if the dev_replace | |
864 | * procedure is suspended by an umount and then | |
865 | * the tgtdev is missing (or "btrfs dev scan") was | |
866 | * not called and the the filesystem is remounted | |
867 | * in degraded state. This does not stop the | |
868 | * dev_replace procedure. It needs to be canceled | |
869 | * manually if the cancelation is wanted. | |
870 | */ | |
871 | break; | |
872 | } | |
873 | return 1; | |
874 | } | |
875 | ||
876 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace) | |
877 | { | |
878 | /* the beginning is just an optimization for the typical case */ | |
879 | if (atomic_read(&dev_replace->nesting_level) == 0) { | |
880 | acquire_lock: | |
881 | /* this is not a nested case where the same thread | |
882 | * is trying to acqurire the same lock twice */ | |
883 | mutex_lock(&dev_replace->lock); | |
884 | mutex_lock(&dev_replace->lock_management_lock); | |
885 | dev_replace->lock_owner = current->pid; | |
886 | atomic_inc(&dev_replace->nesting_level); | |
887 | mutex_unlock(&dev_replace->lock_management_lock); | |
888 | return; | |
889 | } | |
890 | ||
891 | mutex_lock(&dev_replace->lock_management_lock); | |
892 | if (atomic_read(&dev_replace->nesting_level) > 0 && | |
893 | dev_replace->lock_owner == current->pid) { | |
894 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); | |
895 | atomic_inc(&dev_replace->nesting_level); | |
896 | mutex_unlock(&dev_replace->lock_management_lock); | |
897 | return; | |
898 | } | |
899 | ||
900 | mutex_unlock(&dev_replace->lock_management_lock); | |
901 | goto acquire_lock; | |
902 | } | |
903 | ||
904 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace) | |
905 | { | |
906 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); | |
907 | mutex_lock(&dev_replace->lock_management_lock); | |
908 | WARN_ON(atomic_read(&dev_replace->nesting_level) < 1); | |
909 | WARN_ON(dev_replace->lock_owner != current->pid); | |
910 | atomic_dec(&dev_replace->nesting_level); | |
911 | if (atomic_read(&dev_replace->nesting_level) == 0) { | |
912 | dev_replace->lock_owner = 0; | |
913 | mutex_unlock(&dev_replace->lock_management_lock); | |
914 | mutex_unlock(&dev_replace->lock); | |
915 | } else { | |
916 | mutex_unlock(&dev_replace->lock_management_lock); | |
917 | } | |
918 | } | |
c404e0dc MX |
919 | |
920 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) | |
921 | { | |
922 | percpu_counter_inc(&fs_info->bio_counter); | |
923 | } | |
924 | ||
4245215d | 925 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
c404e0dc | 926 | { |
4245215d | 927 | percpu_counter_sub(&fs_info->bio_counter, amount); |
c404e0dc MX |
928 | |
929 | if (waitqueue_active(&fs_info->replace_wait)) | |
930 | wake_up(&fs_info->replace_wait); | |
931 | } | |
932 | ||
933 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
934 | { | |
935 | DEFINE_WAIT(wait); | |
936 | again: | |
937 | percpu_counter_inc(&fs_info->bio_counter); | |
938 | if (test_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state)) { | |
939 | btrfs_bio_counter_dec(fs_info); | |
940 | wait_event(fs_info->replace_wait, | |
941 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, | |
942 | &fs_info->fs_state)); | |
943 | goto again; | |
944 | } | |
945 | ||
946 | } |