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); | |
e93c89c1 SB |
47 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); |
48 | static int btrfs_dev_replace_kthread(void *data); | |
49 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); | |
50 | ||
51 | ||
52 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
53 | { | |
54 | struct btrfs_key key; | |
55 | struct btrfs_root *dev_root = fs_info->dev_root; | |
56 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
57 | struct extent_buffer *eb; | |
58 | int slot; | |
59 | int ret = 0; | |
60 | struct btrfs_path *path = NULL; | |
61 | int item_size; | |
62 | struct btrfs_dev_replace_item *ptr; | |
63 | u64 src_devid; | |
64 | ||
65 | path = btrfs_alloc_path(); | |
66 | if (!path) { | |
67 | ret = -ENOMEM; | |
68 | goto out; | |
69 | } | |
70 | ||
71 | key.objectid = 0; | |
72 | key.type = BTRFS_DEV_REPLACE_KEY; | |
73 | key.offset = 0; | |
74 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
75 | if (ret) { | |
76 | no_valid_dev_replace_entry_found: | |
77 | ret = 0; | |
78 | dev_replace->replace_state = | |
79 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; | |
80 | dev_replace->cont_reading_from_srcdev_mode = | |
81 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
82 | dev_replace->replace_state = 0; | |
83 | dev_replace->time_started = 0; | |
84 | dev_replace->time_stopped = 0; | |
85 | atomic64_set(&dev_replace->num_write_errors, 0); | |
86 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
87 | dev_replace->cursor_left = 0; | |
88 | dev_replace->committed_cursor_left = 0; | |
89 | dev_replace->cursor_left_last_write_of_item = 0; | |
90 | dev_replace->cursor_right = 0; | |
91 | dev_replace->srcdev = NULL; | |
92 | dev_replace->tgtdev = NULL; | |
93 | dev_replace->is_valid = 0; | |
94 | dev_replace->item_needs_writeback = 0; | |
95 | goto out; | |
96 | } | |
97 | slot = path->slots[0]; | |
98 | eb = path->nodes[0]; | |
99 | item_size = btrfs_item_size_nr(eb, slot); | |
100 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); | |
101 | ||
102 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
efe120a0 FH |
103 | btrfs_warn(fs_info, |
104 | "dev_replace entry found has unexpected size, ignore entry"); | |
e93c89c1 SB |
105 | goto no_valid_dev_replace_entry_found; |
106 | } | |
107 | ||
108 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
109 | dev_replace->cont_reading_from_srcdev_mode = | |
110 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
111 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
112 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
113 | dev_replace->time_stopped = | |
114 | btrfs_dev_replace_time_stopped(eb, ptr); | |
115 | atomic64_set(&dev_replace->num_write_errors, | |
116 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
117 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
118 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
119 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
120 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
121 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
122 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
123 | dev_replace->is_valid = 1; | |
124 | ||
125 | dev_replace->item_needs_writeback = 0; | |
126 | switch (dev_replace->replace_state) { | |
127 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
128 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
129 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
130 | dev_replace->srcdev = NULL; | |
131 | dev_replace->tgtdev = NULL; | |
132 | break; | |
133 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
134 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
135 | dev_replace->srcdev = btrfs_find_device(fs_info, src_devid, | |
136 | NULL, NULL); | |
137 | dev_replace->tgtdev = btrfs_find_device(fs_info, | |
138 | BTRFS_DEV_REPLACE_DEVID, | |
139 | NULL, NULL); | |
140 | /* | |
141 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
142 | * missing | |
143 | */ | |
144 | if (!dev_replace->srcdev && | |
145 | !btrfs_test_opt(dev_root, DEGRADED)) { | |
146 | ret = -EIO; | |
efe120a0 FH |
147 | btrfs_warn(fs_info, |
148 | "cannot mount because device replace operation is ongoing and"); | |
149 | btrfs_warn(fs_info, | |
150 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
151 | src_devid); | |
e93c89c1 SB |
152 | } |
153 | if (!dev_replace->tgtdev && | |
154 | !btrfs_test_opt(dev_root, DEGRADED)) { | |
155 | ret = -EIO; | |
efe120a0 FH |
156 | btrfs_warn(fs_info, |
157 | "cannot mount because device replace operation is ongoing and"); | |
158 | btrfs_warn(fs_info, | |
159 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
6e71c47a | 160 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
161 | } |
162 | if (dev_replace->tgtdev) { | |
163 | if (dev_replace->srcdev) { | |
164 | dev_replace->tgtdev->total_bytes = | |
165 | dev_replace->srcdev->total_bytes; | |
166 | dev_replace->tgtdev->disk_total_bytes = | |
167 | dev_replace->srcdev->disk_total_bytes; | |
935e5cc9 MX |
168 | dev_replace->tgtdev->commit_total_bytes = |
169 | dev_replace->srcdev->commit_total_bytes; | |
e93c89c1 SB |
170 | dev_replace->tgtdev->bytes_used = |
171 | dev_replace->srcdev->bytes_used; | |
ce7213c7 MX |
172 | dev_replace->tgtdev->commit_bytes_used = |
173 | dev_replace->srcdev->commit_bytes_used; | |
e93c89c1 SB |
174 | } |
175 | dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1; | |
176 | btrfs_init_dev_replace_tgtdev_for_resume(fs_info, | |
177 | dev_replace->tgtdev); | |
178 | } | |
179 | break; | |
180 | } | |
181 | ||
182 | out: | |
527afb44 | 183 | btrfs_free_path(path); |
e93c89c1 SB |
184 | return ret; |
185 | } | |
186 | ||
187 | /* | |
188 | * called from commit_transaction. Writes changed device replace state to | |
189 | * disk. | |
190 | */ | |
191 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans, | |
192 | struct btrfs_fs_info *fs_info) | |
193 | { | |
194 | int ret; | |
195 | struct btrfs_root *dev_root = fs_info->dev_root; | |
196 | struct btrfs_path *path; | |
197 | struct btrfs_key key; | |
198 | struct extent_buffer *eb; | |
199 | struct btrfs_dev_replace_item *ptr; | |
200 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
201 | ||
73beece9 | 202 | btrfs_dev_replace_lock(dev_replace, 0); |
e93c89c1 SB |
203 | if (!dev_replace->is_valid || |
204 | !dev_replace->item_needs_writeback) { | |
73beece9 | 205 | btrfs_dev_replace_unlock(dev_replace, 0); |
e93c89c1 SB |
206 | return 0; |
207 | } | |
73beece9 | 208 | btrfs_dev_replace_unlock(dev_replace, 0); |
e93c89c1 SB |
209 | |
210 | key.objectid = 0; | |
211 | key.type = BTRFS_DEV_REPLACE_KEY; | |
212 | key.offset = 0; | |
213 | ||
214 | path = btrfs_alloc_path(); | |
215 | if (!path) { | |
216 | ret = -ENOMEM; | |
217 | goto out; | |
218 | } | |
219 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
220 | if (ret < 0) { | |
efe120a0 | 221 | btrfs_warn(fs_info, "error %d while searching for dev_replace item!", |
e93c89c1 SB |
222 | ret); |
223 | goto out; | |
224 | } | |
225 | ||
226 | if (ret == 0 && | |
227 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
228 | /* | |
229 | * need to delete old one and insert a new one. | |
230 | * Since no attempt is made to recover any old state, if the | |
231 | * dev_replace state is 'running', the data on the target | |
232 | * drive is lost. | |
233 | * It would be possible to recover the state: just make sure | |
234 | * that the beginning of the item is never changed and always | |
235 | * contains all the essential information. Then read this | |
236 | * minimal set of information and use it as a base for the | |
237 | * new state. | |
238 | */ | |
239 | ret = btrfs_del_item(trans, dev_root, path); | |
240 | if (ret != 0) { | |
efe120a0 | 241 | btrfs_warn(fs_info, "delete too small dev_replace item failed %d!", |
e93c89c1 SB |
242 | ret); |
243 | goto out; | |
244 | } | |
245 | ret = 1; | |
246 | } | |
247 | ||
248 | if (ret == 1) { | |
249 | /* need to insert a new item */ | |
250 | btrfs_release_path(path); | |
251 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
252 | &key, sizeof(*ptr)); | |
253 | if (ret < 0) { | |
efe120a0 | 254 | btrfs_warn(fs_info, "insert dev_replace item failed %d!", |
e93c89c1 SB |
255 | ret); |
256 | goto out; | |
257 | } | |
258 | } | |
259 | ||
260 | eb = path->nodes[0]; | |
261 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
262 | struct btrfs_dev_replace_item); | |
263 | ||
73beece9 | 264 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
265 | if (dev_replace->srcdev) |
266 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
267 | dev_replace->srcdev->devid); | |
268 | else | |
269 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
270 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
271 | dev_replace->cont_reading_from_srcdev_mode); | |
272 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
273 | dev_replace->replace_state); | |
274 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
275 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
276 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
277 | atomic64_read(&dev_replace->num_write_errors)); | |
278 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
279 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
280 | dev_replace->cursor_left_last_write_of_item = | |
281 | dev_replace->cursor_left; | |
282 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
283 | dev_replace->cursor_left_last_write_of_item); | |
284 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
285 | dev_replace->cursor_right); | |
286 | dev_replace->item_needs_writeback = 0; | |
73beece9 | 287 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
288 | |
289 | btrfs_mark_buffer_dirty(eb); | |
290 | ||
291 | out: | |
292 | btrfs_free_path(path); | |
293 | ||
294 | return ret; | |
295 | } | |
296 | ||
297 | void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) | |
298 | { | |
299 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
300 | ||
301 | dev_replace->committed_cursor_left = | |
302 | dev_replace->cursor_left_last_write_of_item; | |
303 | } | |
304 | ||
b5255456 AJ |
305 | int btrfs_dev_replace_start(struct btrfs_root *root, char *tgtdev_name, |
306 | u64 srcdevid, char *srcdev_name, int read_src) | |
e93c89c1 SB |
307 | { |
308 | struct btrfs_trans_handle *trans; | |
309 | struct btrfs_fs_info *fs_info = root->fs_info; | |
310 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
311 | int ret; | |
312 | struct btrfs_device *tgt_device = NULL; | |
313 | struct btrfs_device *src_device = NULL; | |
314 | ||
935e5cc9 | 315 | /* the disk copy procedure reuses the scrub code */ |
e93c89c1 | 316 | mutex_lock(&fs_info->volume_mutex); |
b5255456 AJ |
317 | ret = btrfs_find_device_by_devspec(root, srcdevid, |
318 | srcdev_name, &src_device); | |
e93c89c1 | 319 | if (ret) { |
1c43366d MX |
320 | mutex_unlock(&fs_info->volume_mutex); |
321 | return ret; | |
e93c89c1 SB |
322 | } |
323 | ||
b5255456 | 324 | ret = btrfs_init_dev_replace_tgtdev(root, tgtdev_name, |
1c43366d MX |
325 | src_device, &tgt_device); |
326 | mutex_unlock(&fs_info->volume_mutex); | |
327 | if (ret) | |
328 | return ret; | |
e93c89c1 | 329 | |
9e271ae2 AJ |
330 | /* |
331 | * Here we commit the transaction to make sure commit_total_bytes | |
332 | * of all the devices are updated. | |
333 | */ | |
334 | trans = btrfs_attach_transaction(root); | |
335 | if (!IS_ERR(trans)) { | |
336 | ret = btrfs_commit_transaction(trans, root); | |
337 | if (ret) | |
338 | return ret; | |
339 | } else if (PTR_ERR(trans) != -ENOENT) { | |
340 | return PTR_ERR(trans); | |
341 | } | |
342 | ||
73beece9 | 343 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
344 | switch (dev_replace->replace_state) { |
345 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
346 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
347 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
348 | break; | |
349 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
350 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
b5255456 | 351 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
e93c89c1 SB |
352 | goto leave; |
353 | } | |
354 | ||
b5255456 | 355 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
e93c89c1 SB |
356 | WARN_ON(!src_device); |
357 | dev_replace->srcdev = src_device; | |
358 | WARN_ON(!tgt_device); | |
359 | dev_replace->tgtdev = tgt_device; | |
360 | ||
fc23c246 | 361 | btrfs_info_in_rcu(fs_info, |
ecaeb14b | 362 | "dev_replace from %s (devid %llu) to %s started", |
e93c89c1 SB |
363 | src_device->missing ? "<missing disk>" : |
364 | rcu_str_deref(src_device->name), | |
365 | src_device->devid, | |
366 | rcu_str_deref(tgt_device->name)); | |
367 | ||
e93c89c1 SB |
368 | /* |
369 | * from now on, the writes to the srcdev are all duplicated to | |
370 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
371 | */ | |
372 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
4546bcae | 373 | dev_replace->time_started = get_seconds(); |
e93c89c1 SB |
374 | dev_replace->cursor_left = 0; |
375 | dev_replace->committed_cursor_left = 0; | |
376 | dev_replace->cursor_left_last_write_of_item = 0; | |
377 | dev_replace->cursor_right = 0; | |
378 | dev_replace->is_valid = 1; | |
379 | dev_replace->item_needs_writeback = 1; | |
7ccefb98 YK |
380 | atomic64_set(&dev_replace->num_write_errors, 0); |
381 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
73beece9 | 382 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 | 383 | |
73416dab LB |
384 | ret = btrfs_sysfs_add_device_link(tgt_device->fs_devices, tgt_device); |
385 | if (ret) | |
fc23c246 | 386 | btrfs_err(fs_info, "kobj add dev failed %d\n", ret); |
73416dab | 387 | |
578def7c | 388 | btrfs_wait_ordered_roots(root->fs_info, -1, 0, (u64)-1); |
e93c89c1 SB |
389 | |
390 | /* force writing the updated state information to disk */ | |
391 | trans = btrfs_start_transaction(root, 0); | |
392 | if (IS_ERR(trans)) { | |
393 | ret = PTR_ERR(trans); | |
73beece9 | 394 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
395 | goto leave; |
396 | } | |
397 | ||
398 | ret = btrfs_commit_transaction(trans, root); | |
399 | WARN_ON(ret); | |
400 | ||
401 | /* the disk copy procedure reuses the scrub code */ | |
402 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 403 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
404 | &dev_replace->scrub_progress, 0, 1); |
405 | ||
fc23c246 | 406 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
2fc9f6ba | 407 | if (ret == -EINPROGRESS) { |
b5255456 | 408 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
2fc9f6ba EG |
409 | } else { |
410 | WARN_ON(ret); | |
411 | } | |
e93c89c1 | 412 | |
2fc9f6ba | 413 | return ret; |
e93c89c1 SB |
414 | |
415 | leave: | |
416 | dev_replace->srcdev = NULL; | |
417 | dev_replace->tgtdev = NULL; | |
73beece9 | 418 | btrfs_dev_replace_unlock(dev_replace, 1); |
1c43366d | 419 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
e93c89c1 SB |
420 | return ret; |
421 | } | |
422 | ||
b5255456 AJ |
423 | int btrfs_dev_replace_by_ioctl(struct btrfs_root *root, |
424 | struct btrfs_ioctl_dev_replace_args *args) | |
425 | { | |
426 | int ret; | |
427 | ||
428 | switch (args->start.cont_reading_from_srcdev_mode) { | |
429 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
430 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
431 | break; | |
432 | default: | |
433 | return -EINVAL; | |
434 | } | |
435 | ||
436 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
437 | args->start.tgtdev_name[0] == '\0') | |
438 | return -EINVAL; | |
439 | ||
440 | ret = btrfs_dev_replace_start(root, args->start.tgtdev_name, | |
441 | args->start.srcdevid, | |
442 | args->start.srcdev_name, | |
443 | args->start.cont_reading_from_srcdev_mode); | |
444 | args->result = ret; | |
445 | /* don't warn if EINPROGRESS, someone else might be running scrub */ | |
446 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS) | |
447 | ret = 0; | |
448 | ||
449 | return ret; | |
450 | } | |
451 | ||
c404e0dc | 452 | /* |
01327610 | 453 | * blocked until all in-flight bios operations are finished. |
c404e0dc MX |
454 | */ |
455 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
456 | { | |
c404e0dc | 457 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
7653947f ZL |
458 | wait_event(fs_info->replace_wait, !percpu_counter_sum( |
459 | &fs_info->bio_counter)); | |
c404e0dc MX |
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); | |
730d9ec3 | 468 | wake_up(&fs_info->replace_wait); |
c404e0dc MX |
469 | } |
470 | ||
e93c89c1 SB |
471 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
472 | int scrub_ret) | |
473 | { | |
474 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
475 | struct btrfs_device *tgt_device; | |
476 | struct btrfs_device *src_device; | |
477 | struct btrfs_root *root = fs_info->tree_root; | |
478 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
479 | struct btrfs_trans_handle *trans; | |
480 | int ret = 0; | |
481 | ||
482 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
483 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
484 | ||
73beece9 | 485 | btrfs_dev_replace_lock(dev_replace, 0); |
e93c89c1 SB |
486 | /* was the operation canceled, or is it finished? */ |
487 | if (dev_replace->replace_state != | |
488 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
73beece9 | 489 | btrfs_dev_replace_unlock(dev_replace, 0); |
e93c89c1 SB |
490 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
491 | return 0; | |
492 | } | |
493 | ||
494 | tgt_device = dev_replace->tgtdev; | |
495 | src_device = dev_replace->srcdev; | |
73beece9 | 496 | btrfs_dev_replace_unlock(dev_replace, 0); |
e93c89c1 | 497 | |
e93c89c1 SB |
498 | /* |
499 | * flush all outstanding I/O and inode extent mappings before the | |
500 | * copy operation is declared as being finished | |
501 | */ | |
6c255e67 | 502 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
3edb2a68 MX |
503 | if (ret) { |
504 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
505 | return ret; | |
506 | } | |
578def7c | 507 | btrfs_wait_ordered_roots(root->fs_info, -1, 0, (u64)-1); |
e93c89c1 SB |
508 | |
509 | trans = btrfs_start_transaction(root, 0); | |
510 | if (IS_ERR(trans)) { | |
511 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
512 | return PTR_ERR(trans); | |
513 | } | |
514 | ret = btrfs_commit_transaction(trans, root); | |
515 | WARN_ON(ret); | |
516 | ||
67a2c45e | 517 | mutex_lock(&uuid_mutex); |
e93c89c1 SB |
518 | /* keep away write_all_supers() during the finishing procedure */ |
519 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2196d6e8 | 520 | mutex_lock(&root->fs_info->chunk_mutex); |
73beece9 | 521 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
522 | dev_replace->replace_state = |
523 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
524 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
525 | dev_replace->tgtdev = NULL; | |
526 | dev_replace->srcdev = NULL; | |
4546bcae | 527 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
528 | dev_replace->item_needs_writeback = 1; |
529 | ||
c404e0dc MX |
530 | /* replace old device with new one in mapping tree */ |
531 | if (!scrub_ret) { | |
532 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, | |
533 | src_device, | |
534 | tgt_device); | |
535 | } else { | |
ecaeb14b DS |
536 | btrfs_err_in_rcu(root->fs_info, |
537 | "btrfs_scrub_dev(%s, %llu, %s) failed %d", | |
e93c89c1 SB |
538 | src_device->missing ? "<missing disk>" : |
539 | rcu_str_deref(src_device->name), | |
540 | src_device->devid, | |
541 | rcu_str_deref(tgt_device->name), scrub_ret); | |
73beece9 | 542 | btrfs_dev_replace_unlock(dev_replace, 1); |
391cd9df | 543 | mutex_unlock(&root->fs_info->chunk_mutex); |
2196d6e8 | 544 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
67a2c45e | 545 | mutex_unlock(&uuid_mutex); |
e93c89c1 SB |
546 | if (tgt_device) |
547 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
548 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
549 | ||
2fc9f6ba | 550 | return scrub_ret; |
e93c89c1 SB |
551 | } |
552 | ||
ecaeb14b DS |
553 | btrfs_info_in_rcu(root->fs_info, |
554 | "dev_replace from %s (devid %llu) to %s finished", | |
e93c89c1 SB |
555 | src_device->missing ? "<missing disk>" : |
556 | rcu_str_deref(src_device->name), | |
557 | src_device->devid, | |
558 | rcu_str_deref(tgt_device->name)); | |
559 | tgt_device->is_tgtdev_for_dev_replace = 0; | |
560 | tgt_device->devid = src_device->devid; | |
561 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
562 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
563 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
564 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
565 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
566 | btrfs_device_set_disk_total_bytes(tgt_device, | |
567 | src_device->disk_total_bytes); | |
568 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
935e5cc9 MX |
569 | ASSERT(list_empty(&src_device->resized_list)); |
570 | tgt_device->commit_total_bytes = src_device->commit_total_bytes; | |
ce7213c7 | 571 | tgt_device->commit_bytes_used = src_device->bytes_used; |
88acff64 AJ |
572 | |
573 | btrfs_assign_next_active_device(fs_info, src_device, tgt_device); | |
574 | ||
e93c89c1 | 575 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); |
82372bc8 | 576 | fs_info->fs_devices->rw_devices++; |
e93c89c1 | 577 | |
73beece9 | 578 | btrfs_dev_replace_unlock(dev_replace, 1); |
12b894cb | 579 | |
c404e0dc MX |
580 | btrfs_rm_dev_replace_blocked(fs_info); |
581 | ||
084b6e7c | 582 | btrfs_rm_dev_replace_remove_srcdev(fs_info, src_device); |
1357272f | 583 | |
c404e0dc MX |
584 | btrfs_rm_dev_replace_unblocked(fs_info); |
585 | ||
e93c89c1 SB |
586 | /* |
587 | * this is again a consistent state where no dev_replace procedure | |
588 | * is running, the target device is part of the filesystem, the | |
589 | * source device is not part of the filesystem anymore and its 1st | |
590 | * superblock is scratched out so that it is no longer marked to | |
591 | * belong to this filesystem. | |
592 | */ | |
391cd9df | 593 | mutex_unlock(&root->fs_info->chunk_mutex); |
2196d6e8 | 594 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
67a2c45e | 595 | mutex_unlock(&uuid_mutex); |
e93c89c1 | 596 | |
084b6e7c | 597 | /* replace the sysfs entry */ |
32576040 | 598 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, src_device); |
084b6e7c QW |
599 | btrfs_rm_dev_replace_free_srcdev(fs_info, src_device); |
600 | ||
e93c89c1 SB |
601 | /* write back the superblocks */ |
602 | trans = btrfs_start_transaction(root, 0); | |
603 | if (!IS_ERR(trans)) | |
604 | btrfs_commit_transaction(trans, root); | |
605 | ||
606 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
612 | struct btrfs_fs_info *fs_info, | |
613 | struct btrfs_device *srcdev, | |
614 | struct btrfs_device *tgtdev) | |
615 | { | |
616 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; | |
617 | struct extent_map *em; | |
618 | struct map_lookup *map; | |
619 | u64 start = 0; | |
620 | int i; | |
621 | ||
622 | write_lock(&em_tree->lock); | |
623 | do { | |
624 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
625 | if (!em) | |
626 | break; | |
95617d69 | 627 | map = em->map_lookup; |
e93c89c1 SB |
628 | for (i = 0; i < map->num_stripes; i++) |
629 | if (srcdev == map->stripes[i].dev) | |
630 | map->stripes[i].dev = tgtdev; | |
631 | start = em->start + em->len; | |
632 | free_extent_map(em); | |
633 | } while (start); | |
634 | write_unlock(&em_tree->lock); | |
635 | } | |
636 | ||
e93c89c1 SB |
637 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
638 | struct btrfs_ioctl_dev_replace_args *args) | |
639 | { | |
640 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
7cc8e58d | 641 | struct btrfs_device *srcdev; |
e93c89c1 | 642 | |
73beece9 | 643 | btrfs_dev_replace_lock(dev_replace, 0); |
e93c89c1 SB |
644 | /* even if !dev_replace_is_valid, the values are good enough for |
645 | * the replace_status ioctl */ | |
646 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
647 | args->status.replace_state = dev_replace->replace_state; | |
648 | args->status.time_started = dev_replace->time_started; | |
649 | args->status.time_stopped = dev_replace->time_stopped; | |
650 | args->status.num_write_errors = | |
651 | atomic64_read(&dev_replace->num_write_errors); | |
652 | args->status.num_uncorrectable_read_errors = | |
653 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
654 | switch (dev_replace->replace_state) { | |
655 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
656 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
657 | args->status.progress_1000 = 0; | |
658 | break; | |
659 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
660 | args->status.progress_1000 = 1000; | |
661 | break; | |
662 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
663 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
7cc8e58d | 664 | srcdev = dev_replace->srcdev; |
f8c269d7 DS |
665 | args->status.progress_1000 = div_u64(dev_replace->cursor_left, |
666 | div_u64(btrfs_device_get_total_bytes(srcdev), 1000)); | |
e93c89c1 SB |
667 | break; |
668 | } | |
73beece9 | 669 | btrfs_dev_replace_unlock(dev_replace, 0); |
e93c89c1 SB |
670 | } |
671 | ||
672 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, | |
673 | struct btrfs_ioctl_dev_replace_args *args) | |
674 | { | |
675 | args->result = __btrfs_dev_replace_cancel(fs_info); | |
676 | return 0; | |
677 | } | |
678 | ||
679 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) | |
680 | { | |
681 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
682 | struct btrfs_device *tgt_device = NULL; | |
683 | struct btrfs_trans_handle *trans; | |
684 | struct btrfs_root *root = fs_info->tree_root; | |
685 | u64 result; | |
686 | int ret; | |
687 | ||
e649e587 ID |
688 | if (fs_info->sb->s_flags & MS_RDONLY) |
689 | return -EROFS; | |
690 | ||
e93c89c1 | 691 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
73beece9 | 692 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
693 | switch (dev_replace->replace_state) { |
694 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
695 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
696 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
697 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
73beece9 | 698 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
699 | goto leave; |
700 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
701 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
702 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
703 | tgt_device = dev_replace->tgtdev; | |
704 | dev_replace->tgtdev = NULL; | |
705 | dev_replace->srcdev = NULL; | |
706 | break; | |
707 | } | |
708 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
4546bcae | 709 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 | 710 | dev_replace->item_needs_writeback = 1; |
73beece9 | 711 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
712 | btrfs_scrub_cancel(fs_info); |
713 | ||
714 | trans = btrfs_start_transaction(root, 0); | |
715 | if (IS_ERR(trans)) { | |
716 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
717 | return PTR_ERR(trans); | |
718 | } | |
719 | ret = btrfs_commit_transaction(trans, root); | |
720 | WARN_ON(ret); | |
721 | if (tgt_device) | |
722 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
723 | ||
724 | leave: | |
725 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
726 | return result; | |
727 | } | |
728 | ||
729 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
730 | { | |
731 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
732 | ||
733 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
73beece9 | 734 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
735 | switch (dev_replace->replace_state) { |
736 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
737 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
738 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
739 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
740 | break; | |
741 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
742 | dev_replace->replace_state = | |
743 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
4546bcae | 744 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 | 745 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 746 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
747 | break; |
748 | } | |
749 | ||
73beece9 | 750 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
751 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
752 | } | |
753 | ||
754 | /* resume dev_replace procedure that was interrupted by unmount */ | |
755 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
756 | { | |
757 | struct task_struct *task; | |
758 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
759 | ||
73beece9 | 760 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
761 | switch (dev_replace->replace_state) { |
762 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
763 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
764 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
73beece9 | 765 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
766 | return 0; |
767 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
768 | break; | |
769 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
770 | dev_replace->replace_state = | |
771 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
772 | break; | |
773 | } | |
774 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 FH |
775 | btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing"); |
776 | btrfs_info(fs_info, | |
777 | "you may cancel the operation after 'mount -o degraded'"); | |
73beece9 | 778 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
779 | return 0; |
780 | } | |
73beece9 | 781 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
782 | |
783 | WARN_ON(atomic_xchg( | |
784 | &fs_info->mutually_exclusive_operation_running, 1)); | |
785 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); | |
8c6ffba0 | 786 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
787 | } |
788 | ||
789 | static int btrfs_dev_replace_kthread(void *data) | |
790 | { | |
791 | struct btrfs_fs_info *fs_info = data; | |
792 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
793 | struct btrfs_ioctl_dev_replace_args *status_args; | |
794 | u64 progress; | |
795 | ||
58c4e173 | 796 | status_args = kzalloc(sizeof(*status_args), GFP_KERNEL); |
e93c89c1 SB |
797 | if (status_args) { |
798 | btrfs_dev_replace_status(fs_info, status_args); | |
799 | progress = status_args->status.progress_1000; | |
800 | kfree(status_args); | |
f8c269d7 | 801 | progress = div_u64(progress, 10); |
ecaeb14b DS |
802 | btrfs_info_in_rcu(fs_info, |
803 | "continuing dev_replace from %s (devid %llu) to %s @%u%%", | |
efe120a0 FH |
804 | dev_replace->srcdev->missing ? "<missing disk>" : |
805 | rcu_str_deref(dev_replace->srcdev->name), | |
806 | dev_replace->srcdev->devid, | |
807 | dev_replace->tgtdev ? | |
808 | rcu_str_deref(dev_replace->tgtdev->name) : | |
809 | "<missing target disk>", | |
810 | (unsigned int)progress); | |
e93c89c1 SB |
811 | } |
812 | btrfs_dev_replace_continue_on_mount(fs_info); | |
813 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
818 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) | |
819 | { | |
820 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
821 | int ret; | |
822 | ||
823 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, | |
824 | dev_replace->committed_cursor_left, | |
7cc8e58d | 825 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
826 | &dev_replace->scrub_progress, 0, 1); |
827 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
828 | WARN_ON(ret); | |
829 | return 0; | |
830 | } | |
831 | ||
832 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) | |
833 | { | |
834 | if (!dev_replace->is_valid) | |
835 | return 0; | |
836 | ||
837 | switch (dev_replace->replace_state) { | |
838 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
839 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
840 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
841 | return 0; | |
842 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
843 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
844 | /* | |
845 | * return true even if tgtdev is missing (this is | |
846 | * something that can happen if the dev_replace | |
847 | * procedure is suspended by an umount and then | |
848 | * the tgtdev is missing (or "btrfs dev scan") was | |
849 | * not called and the the filesystem is remounted | |
850 | * in degraded state. This does not stop the | |
851 | * dev_replace procedure. It needs to be canceled | |
bb7ab3b9 | 852 | * manually if the cancellation is wanted. |
e93c89c1 SB |
853 | */ |
854 | break; | |
855 | } | |
856 | return 1; | |
857 | } | |
858 | ||
73beece9 | 859 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace, int rw) |
e93c89c1 | 860 | { |
73beece9 LB |
861 | if (rw == 1) { |
862 | /* write */ | |
863 | again: | |
864 | wait_event(dev_replace->read_lock_wq, | |
865 | atomic_read(&dev_replace->blocking_readers) == 0); | |
866 | write_lock(&dev_replace->lock); | |
867 | if (atomic_read(&dev_replace->blocking_readers)) { | |
868 | write_unlock(&dev_replace->lock); | |
869 | goto again; | |
870 | } | |
871 | } else { | |
872 | read_lock(&dev_replace->lock); | |
873 | atomic_inc(&dev_replace->read_locks); | |
e93c89c1 | 874 | } |
73beece9 | 875 | } |
e93c89c1 | 876 | |
73beece9 LB |
877 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace, int rw) |
878 | { | |
879 | if (rw == 1) { | |
880 | /* write */ | |
881 | ASSERT(atomic_read(&dev_replace->blocking_readers) == 0); | |
882 | write_unlock(&dev_replace->lock); | |
883 | } else { | |
884 | ASSERT(atomic_read(&dev_replace->read_locks) > 0); | |
885 | atomic_dec(&dev_replace->read_locks); | |
886 | read_unlock(&dev_replace->lock); | |
e93c89c1 | 887 | } |
73beece9 | 888 | } |
e93c89c1 | 889 | |
73beece9 LB |
890 | /* inc blocking cnt and release read lock */ |
891 | void btrfs_dev_replace_set_lock_blocking( | |
892 | struct btrfs_dev_replace *dev_replace) | |
893 | { | |
894 | /* only set blocking for read lock */ | |
895 | ASSERT(atomic_read(&dev_replace->read_locks) > 0); | |
896 | atomic_inc(&dev_replace->blocking_readers); | |
897 | read_unlock(&dev_replace->lock); | |
e93c89c1 SB |
898 | } |
899 | ||
73beece9 LB |
900 | /* acquire read lock and dec blocking cnt */ |
901 | void btrfs_dev_replace_clear_lock_blocking( | |
902 | struct btrfs_dev_replace *dev_replace) | |
e93c89c1 | 903 | { |
73beece9 LB |
904 | /* only set blocking for read lock */ |
905 | ASSERT(atomic_read(&dev_replace->read_locks) > 0); | |
906 | ASSERT(atomic_read(&dev_replace->blocking_readers) > 0); | |
907 | read_lock(&dev_replace->lock); | |
908 | if (atomic_dec_and_test(&dev_replace->blocking_readers) && | |
909 | waitqueue_active(&dev_replace->read_lock_wq)) | |
910 | wake_up(&dev_replace->read_lock_wq); | |
e93c89c1 | 911 | } |
c404e0dc MX |
912 | |
913 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) | |
914 | { | |
915 | percpu_counter_inc(&fs_info->bio_counter); | |
916 | } | |
917 | ||
4245215d | 918 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
c404e0dc | 919 | { |
4245215d | 920 | percpu_counter_sub(&fs_info->bio_counter, amount); |
c404e0dc MX |
921 | |
922 | if (waitqueue_active(&fs_info->replace_wait)) | |
923 | wake_up(&fs_info->replace_wait); | |
924 | } | |
925 | ||
926 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
927 | { | |
09dd7a01 ZL |
928 | while (1) { |
929 | percpu_counter_inc(&fs_info->bio_counter); | |
930 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, | |
931 | &fs_info->fs_state))) | |
932 | break; | |
933 | ||
c404e0dc MX |
934 | btrfs_bio_counter_dec(fs_info); |
935 | wait_event(fs_info->replace_wait, | |
936 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, | |
937 | &fs_info->fs_state)); | |
c404e0dc | 938 | } |
c404e0dc | 939 | } |