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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: | |
2f05c56f | 135 | dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices, |
34857e15 | 136 | src_devid, NULL, NULL, true); |
2f05c56f | 137 | dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices, |
e93c89c1 | 138 | BTRFS_DEV_REPLACE_DEVID, |
34857e15 | 139 | NULL, NULL, true); |
e93c89c1 SB |
140 | /* |
141 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
142 | * missing | |
143 | */ | |
144 | if (!dev_replace->srcdev && | |
0b246afa | 145 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 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 && | |
0b246afa | 154 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 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) { | |
5d163e0e JM |
221 | btrfs_warn(fs_info, |
222 | "error %d while searching for dev_replace item!", | |
223 | ret); | |
e93c89c1 SB |
224 | goto out; |
225 | } | |
226 | ||
227 | if (ret == 0 && | |
228 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
229 | /* | |
230 | * need to delete old one and insert a new one. | |
231 | * Since no attempt is made to recover any old state, if the | |
232 | * dev_replace state is 'running', the data on the target | |
233 | * drive is lost. | |
234 | * It would be possible to recover the state: just make sure | |
235 | * that the beginning of the item is never changed and always | |
236 | * contains all the essential information. Then read this | |
237 | * minimal set of information and use it as a base for the | |
238 | * new state. | |
239 | */ | |
240 | ret = btrfs_del_item(trans, dev_root, path); | |
241 | if (ret != 0) { | |
5d163e0e JM |
242 | btrfs_warn(fs_info, |
243 | "delete too small dev_replace item failed %d!", | |
244 | ret); | |
e93c89c1 SB |
245 | goto out; |
246 | } | |
247 | ret = 1; | |
248 | } | |
249 | ||
250 | if (ret == 1) { | |
251 | /* need to insert a new item */ | |
252 | btrfs_release_path(path); | |
253 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
254 | &key, sizeof(*ptr)); | |
255 | if (ret < 0) { | |
5d163e0e JM |
256 | btrfs_warn(fs_info, |
257 | "insert dev_replace item failed %d!", ret); | |
e93c89c1 SB |
258 | goto out; |
259 | } | |
260 | } | |
261 | ||
262 | eb = path->nodes[0]; | |
263 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
264 | struct btrfs_dev_replace_item); | |
265 | ||
73beece9 | 266 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
267 | if (dev_replace->srcdev) |
268 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
269 | dev_replace->srcdev->devid); | |
270 | else | |
271 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
272 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
273 | dev_replace->cont_reading_from_srcdev_mode); | |
274 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
275 | dev_replace->replace_state); | |
276 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
277 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
278 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
279 | atomic64_read(&dev_replace->num_write_errors)); | |
280 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
281 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
282 | dev_replace->cursor_left_last_write_of_item = | |
283 | dev_replace->cursor_left; | |
284 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
285 | dev_replace->cursor_left_last_write_of_item); | |
286 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
287 | dev_replace->cursor_right); | |
288 | dev_replace->item_needs_writeback = 0; | |
73beece9 | 289 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
290 | |
291 | btrfs_mark_buffer_dirty(eb); | |
292 | ||
293 | out: | |
294 | btrfs_free_path(path); | |
295 | ||
296 | return ret; | |
297 | } | |
298 | ||
299 | void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) | |
300 | { | |
301 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
302 | ||
303 | dev_replace->committed_cursor_left = | |
304 | dev_replace->cursor_left_last_write_of_item; | |
305 | } | |
306 | ||
da353f6b DS |
307 | int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
308 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, | |
309 | int read_src) | |
e93c89c1 | 310 | { |
2ff7e61e | 311 | struct btrfs_root *root = fs_info->dev_root; |
e93c89c1 | 312 | struct btrfs_trans_handle *trans; |
e93c89c1 SB |
313 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
314 | int ret; | |
315 | struct btrfs_device *tgt_device = NULL; | |
316 | struct btrfs_device *src_device = NULL; | |
317 | ||
935e5cc9 | 318 | /* the disk copy procedure reuses the scrub code */ |
e93c89c1 | 319 | mutex_lock(&fs_info->volume_mutex); |
2ff7e61e | 320 | ret = btrfs_find_device_by_devspec(fs_info, srcdevid, |
b5255456 | 321 | srcdev_name, &src_device); |
e93c89c1 | 322 | if (ret) { |
1c43366d MX |
323 | mutex_unlock(&fs_info->volume_mutex); |
324 | return ret; | |
e93c89c1 SB |
325 | } |
326 | ||
2ff7e61e | 327 | ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name, |
1c43366d MX |
328 | src_device, &tgt_device); |
329 | mutex_unlock(&fs_info->volume_mutex); | |
330 | if (ret) | |
331 | return ret; | |
e93c89c1 | 332 | |
9e271ae2 AJ |
333 | /* |
334 | * Here we commit the transaction to make sure commit_total_bytes | |
335 | * of all the devices are updated. | |
336 | */ | |
337 | trans = btrfs_attach_transaction(root); | |
338 | if (!IS_ERR(trans)) { | |
3a45bb20 | 339 | ret = btrfs_commit_transaction(trans); |
9e271ae2 AJ |
340 | if (ret) |
341 | return ret; | |
342 | } else if (PTR_ERR(trans) != -ENOENT) { | |
343 | return PTR_ERR(trans); | |
344 | } | |
345 | ||
73beece9 | 346 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
347 | switch (dev_replace->replace_state) { |
348 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
349 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
350 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
351 | break; | |
352 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
353 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1d5be357 | 354 | ASSERT(0); |
b5255456 | 355 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
e93c89c1 SB |
356 | goto leave; |
357 | } | |
358 | ||
b5255456 | 359 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
e93c89c1 SB |
360 | WARN_ON(!src_device); |
361 | dev_replace->srcdev = src_device; | |
362 | WARN_ON(!tgt_device); | |
363 | dev_replace->tgtdev = tgt_device; | |
364 | ||
fc23c246 | 365 | btrfs_info_in_rcu(fs_info, |
ecaeb14b | 366 | "dev_replace from %s (devid %llu) to %s started", |
e93c89c1 SB |
367 | src_device->missing ? "<missing disk>" : |
368 | rcu_str_deref(src_device->name), | |
369 | src_device->devid, | |
370 | rcu_str_deref(tgt_device->name)); | |
371 | ||
e93c89c1 SB |
372 | /* |
373 | * from now on, the writes to the srcdev are all duplicated to | |
374 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
375 | */ | |
376 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
4546bcae | 377 | dev_replace->time_started = get_seconds(); |
e93c89c1 SB |
378 | dev_replace->cursor_left = 0; |
379 | dev_replace->committed_cursor_left = 0; | |
380 | dev_replace->cursor_left_last_write_of_item = 0; | |
381 | dev_replace->cursor_right = 0; | |
382 | dev_replace->is_valid = 1; | |
383 | dev_replace->item_needs_writeback = 1; | |
7ccefb98 YK |
384 | atomic64_set(&dev_replace->num_write_errors, 0); |
385 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
73beece9 | 386 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 | 387 | |
73416dab LB |
388 | ret = btrfs_sysfs_add_device_link(tgt_device->fs_devices, tgt_device); |
389 | if (ret) | |
ab8d0fc4 | 390 | btrfs_err(fs_info, "kobj add dev failed %d", ret); |
73416dab | 391 | |
6374e57a | 392 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 SB |
393 | |
394 | /* force writing the updated state information to disk */ | |
395 | trans = btrfs_start_transaction(root, 0); | |
396 | if (IS_ERR(trans)) { | |
397 | ret = PTR_ERR(trans); | |
73beece9 | 398 | btrfs_dev_replace_lock(dev_replace, 1); |
1d5be357 JM |
399 | dev_replace->replace_state = |
400 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; | |
401 | dev_replace->srcdev = NULL; | |
402 | dev_replace->tgtdev = NULL; | |
e93c89c1 SB |
403 | goto leave; |
404 | } | |
405 | ||
3a45bb20 | 406 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
407 | WARN_ON(ret); |
408 | ||
409 | /* the disk copy procedure reuses the scrub code */ | |
410 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 411 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
412 | &dev_replace->scrub_progress, 0, 1); |
413 | ||
fc23c246 | 414 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
2fc9f6ba | 415 | if (ret == -EINPROGRESS) { |
b5255456 | 416 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
2fc9f6ba EG |
417 | } else { |
418 | WARN_ON(ret); | |
419 | } | |
e93c89c1 | 420 | |
2fc9f6ba | 421 | return ret; |
e93c89c1 SB |
422 | |
423 | leave: | |
73beece9 | 424 | btrfs_dev_replace_unlock(dev_replace, 1); |
1c43366d | 425 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
e93c89c1 SB |
426 | return ret; |
427 | } | |
428 | ||
2ff7e61e | 429 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
b5255456 AJ |
430 | struct btrfs_ioctl_dev_replace_args *args) |
431 | { | |
432 | int ret; | |
433 | ||
434 | switch (args->start.cont_reading_from_srcdev_mode) { | |
435 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
436 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
437 | break; | |
438 | default: | |
439 | return -EINVAL; | |
440 | } | |
441 | ||
442 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
443 | args->start.tgtdev_name[0] == '\0') | |
444 | return -EINVAL; | |
445 | ||
2ff7e61e | 446 | ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name, |
b5255456 AJ |
447 | args->start.srcdevid, |
448 | args->start.srcdev_name, | |
449 | args->start.cont_reading_from_srcdev_mode); | |
450 | args->result = ret; | |
451 | /* don't warn if EINPROGRESS, someone else might be running scrub */ | |
452 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS) | |
453 | ret = 0; | |
454 | ||
455 | return ret; | |
456 | } | |
457 | ||
c404e0dc | 458 | /* |
01327610 | 459 | * blocked until all in-flight bios operations are finished. |
c404e0dc MX |
460 | */ |
461 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
462 | { | |
c404e0dc | 463 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
7653947f ZL |
464 | wait_event(fs_info->replace_wait, !percpu_counter_sum( |
465 | &fs_info->bio_counter)); | |
c404e0dc MX |
466 | } |
467 | ||
468 | /* | |
469 | * we have removed target device, it is safe to allow new bios request. | |
470 | */ | |
471 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
472 | { | |
473 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
730d9ec3 | 474 | wake_up(&fs_info->replace_wait); |
c404e0dc MX |
475 | } |
476 | ||
e93c89c1 SB |
477 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
478 | int scrub_ret) | |
479 | { | |
480 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
481 | struct btrfs_device *tgt_device; | |
482 | struct btrfs_device *src_device; | |
483 | struct btrfs_root *root = fs_info->tree_root; | |
484 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
485 | struct btrfs_trans_handle *trans; | |
486 | int ret = 0; | |
487 | ||
488 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
489 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
490 | ||
73beece9 | 491 | btrfs_dev_replace_lock(dev_replace, 0); |
e93c89c1 SB |
492 | /* was the operation canceled, or is it finished? */ |
493 | if (dev_replace->replace_state != | |
494 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
73beece9 | 495 | btrfs_dev_replace_unlock(dev_replace, 0); |
e93c89c1 SB |
496 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
497 | return 0; | |
498 | } | |
499 | ||
500 | tgt_device = dev_replace->tgtdev; | |
501 | src_device = dev_replace->srcdev; | |
73beece9 | 502 | btrfs_dev_replace_unlock(dev_replace, 0); |
e93c89c1 | 503 | |
e93c89c1 SB |
504 | /* |
505 | * flush all outstanding I/O and inode extent mappings before the | |
506 | * copy operation is declared as being finished | |
507 | */ | |
0b246afa | 508 | ret = btrfs_start_delalloc_roots(fs_info, 0, -1); |
3edb2a68 MX |
509 | if (ret) { |
510 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
511 | return ret; | |
512 | } | |
6374e57a | 513 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 | 514 | |
8217e0f8 NB |
515 | while (1) { |
516 | trans = btrfs_start_transaction(root, 0); | |
517 | if (IS_ERR(trans)) { | |
518 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
519 | return PTR_ERR(trans); | |
520 | } | |
521 | ret = btrfs_commit_transaction(trans); | |
522 | WARN_ON(ret); | |
523 | mutex_lock(&uuid_mutex); | |
524 | /* keep away write_all_supers() during the finishing procedure */ | |
525 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
526 | mutex_lock(&fs_info->chunk_mutex); | |
527 | if (src_device->has_pending_chunks) { | |
528 | mutex_unlock(&root->fs_info->chunk_mutex); | |
529 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
530 | mutex_unlock(&uuid_mutex); | |
531 | } else { | |
532 | break; | |
533 | } | |
e93c89c1 | 534 | } |
e93c89c1 | 535 | |
73beece9 | 536 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
537 | dev_replace->replace_state = |
538 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
539 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
540 | dev_replace->tgtdev = NULL; | |
541 | dev_replace->srcdev = NULL; | |
4546bcae | 542 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
543 | dev_replace->item_needs_writeback = 1; |
544 | ||
c404e0dc MX |
545 | /* replace old device with new one in mapping tree */ |
546 | if (!scrub_ret) { | |
547 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, | |
548 | src_device, | |
549 | tgt_device); | |
550 | } else { | |
0b246afa JM |
551 | btrfs_err_in_rcu(fs_info, |
552 | "btrfs_scrub_dev(%s, %llu, %s) failed %d", | |
553 | src_device->missing ? "<missing disk>" : | |
554 | rcu_str_deref(src_device->name), | |
555 | src_device->devid, | |
556 | rcu_str_deref(tgt_device->name), scrub_ret); | |
73beece9 | 557 | btrfs_dev_replace_unlock(dev_replace, 1); |
0b246afa JM |
558 | mutex_unlock(&fs_info->chunk_mutex); |
559 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
67a2c45e | 560 | mutex_unlock(&uuid_mutex); |
ae6529c3 | 561 | btrfs_rm_dev_replace_blocked(fs_info); |
e93c89c1 SB |
562 | if (tgt_device) |
563 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
ae6529c3 | 564 | btrfs_rm_dev_replace_unblocked(fs_info); |
e93c89c1 SB |
565 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
566 | ||
2fc9f6ba | 567 | return scrub_ret; |
e93c89c1 SB |
568 | } |
569 | ||
0b246afa JM |
570 | btrfs_info_in_rcu(fs_info, |
571 | "dev_replace from %s (devid %llu) to %s finished", | |
572 | src_device->missing ? "<missing disk>" : | |
573 | rcu_str_deref(src_device->name), | |
574 | src_device->devid, | |
575 | rcu_str_deref(tgt_device->name)); | |
e93c89c1 SB |
576 | tgt_device->is_tgtdev_for_dev_replace = 0; |
577 | tgt_device->devid = src_device->devid; | |
578 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
579 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
580 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
581 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
582 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
583 | btrfs_device_set_disk_total_bytes(tgt_device, | |
584 | src_device->disk_total_bytes); | |
585 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
935e5cc9 MX |
586 | ASSERT(list_empty(&src_device->resized_list)); |
587 | tgt_device->commit_total_bytes = src_device->commit_total_bytes; | |
ce7213c7 | 588 | tgt_device->commit_bytes_used = src_device->bytes_used; |
88acff64 AJ |
589 | |
590 | btrfs_assign_next_active_device(fs_info, src_device, tgt_device); | |
591 | ||
e93c89c1 | 592 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); |
82372bc8 | 593 | fs_info->fs_devices->rw_devices++; |
e93c89c1 | 594 | |
73beece9 | 595 | btrfs_dev_replace_unlock(dev_replace, 1); |
12b894cb | 596 | |
c404e0dc MX |
597 | btrfs_rm_dev_replace_blocked(fs_info); |
598 | ||
084b6e7c | 599 | btrfs_rm_dev_replace_remove_srcdev(fs_info, src_device); |
1357272f | 600 | |
c404e0dc MX |
601 | btrfs_rm_dev_replace_unblocked(fs_info); |
602 | ||
1b10d9e8 MT |
603 | /* |
604 | * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will | |
605 | * update on-disk dev stats value during commit transaction | |
606 | */ | |
607 | atomic_inc(&tgt_device->dev_stats_ccnt); | |
608 | ||
e93c89c1 SB |
609 | /* |
610 | * this is again a consistent state where no dev_replace procedure | |
611 | * is running, the target device is part of the filesystem, the | |
612 | * source device is not part of the filesystem anymore and its 1st | |
613 | * superblock is scratched out so that it is no longer marked to | |
614 | * belong to this filesystem. | |
615 | */ | |
0b246afa JM |
616 | mutex_unlock(&fs_info->chunk_mutex); |
617 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
67a2c45e | 618 | mutex_unlock(&uuid_mutex); |
e93c89c1 | 619 | |
084b6e7c | 620 | /* replace the sysfs entry */ |
32576040 | 621 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, src_device); |
084b6e7c QW |
622 | btrfs_rm_dev_replace_free_srcdev(fs_info, src_device); |
623 | ||
e93c89c1 SB |
624 | /* write back the superblocks */ |
625 | trans = btrfs_start_transaction(root, 0); | |
626 | if (!IS_ERR(trans)) | |
3a45bb20 | 627 | btrfs_commit_transaction(trans); |
e93c89c1 SB |
628 | |
629 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
634 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
635 | struct btrfs_fs_info *fs_info, | |
636 | struct btrfs_device *srcdev, | |
637 | struct btrfs_device *tgtdev) | |
638 | { | |
639 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; | |
640 | struct extent_map *em; | |
641 | struct map_lookup *map; | |
642 | u64 start = 0; | |
643 | int i; | |
644 | ||
645 | write_lock(&em_tree->lock); | |
646 | do { | |
647 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
648 | if (!em) | |
649 | break; | |
95617d69 | 650 | map = em->map_lookup; |
e93c89c1 SB |
651 | for (i = 0; i < map->num_stripes; i++) |
652 | if (srcdev == map->stripes[i].dev) | |
653 | map->stripes[i].dev = tgtdev; | |
654 | start = em->start + em->len; | |
655 | free_extent_map(em); | |
656 | } while (start); | |
657 | write_unlock(&em_tree->lock); | |
658 | } | |
659 | ||
74b595fe DS |
660 | /* |
661 | * Read progress of device replace status according to the state and last | |
662 | * stored position. The value format is the same as for | |
663 | * btrfs_dev_replace::progress_1000 | |
664 | */ | |
665 | static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info) | |
666 | { | |
667 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
668 | u64 ret = 0; | |
669 | ||
670 | switch (dev_replace->replace_state) { | |
671 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
672 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
673 | ret = 0; | |
674 | break; | |
675 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
676 | ret = 1000; | |
677 | break; | |
678 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
679 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
680 | ret = div64_u64(dev_replace->cursor_left, | |
681 | div_u64(btrfs_device_get_total_bytes( | |
682 | dev_replace->srcdev), 1000)); | |
683 | break; | |
684 | } | |
685 | ||
686 | return ret; | |
687 | } | |
688 | ||
e93c89c1 SB |
689 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
690 | struct btrfs_ioctl_dev_replace_args *args) | |
691 | { | |
692 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
693 | ||
73beece9 | 694 | btrfs_dev_replace_lock(dev_replace, 0); |
e93c89c1 SB |
695 | /* even if !dev_replace_is_valid, the values are good enough for |
696 | * the replace_status ioctl */ | |
697 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
698 | args->status.replace_state = dev_replace->replace_state; | |
699 | args->status.time_started = dev_replace->time_started; | |
700 | args->status.time_stopped = dev_replace->time_stopped; | |
701 | args->status.num_write_errors = | |
702 | atomic64_read(&dev_replace->num_write_errors); | |
703 | args->status.num_uncorrectable_read_errors = | |
704 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
74b595fe | 705 | args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); |
73beece9 | 706 | btrfs_dev_replace_unlock(dev_replace, 0); |
e93c89c1 SB |
707 | } |
708 | ||
709 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, | |
710 | struct btrfs_ioctl_dev_replace_args *args) | |
711 | { | |
712 | args->result = __btrfs_dev_replace_cancel(fs_info); | |
713 | return 0; | |
714 | } | |
715 | ||
716 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) | |
717 | { | |
718 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
719 | struct btrfs_device *tgt_device = NULL; | |
720 | struct btrfs_trans_handle *trans; | |
721 | struct btrfs_root *root = fs_info->tree_root; | |
722 | u64 result; | |
723 | int ret; | |
724 | ||
bc98a42c | 725 | if (sb_rdonly(fs_info->sb)) |
e649e587 ID |
726 | return -EROFS; |
727 | ||
e93c89c1 | 728 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
73beece9 | 729 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
730 | switch (dev_replace->replace_state) { |
731 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
732 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
733 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
734 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
73beece9 | 735 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
736 | goto leave; |
737 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
738 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
739 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
740 | tgt_device = dev_replace->tgtdev; | |
741 | dev_replace->tgtdev = NULL; | |
742 | dev_replace->srcdev = NULL; | |
743 | break; | |
744 | } | |
745 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
4546bcae | 746 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 | 747 | dev_replace->item_needs_writeback = 1; |
73beece9 | 748 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
749 | btrfs_scrub_cancel(fs_info); |
750 | ||
751 | trans = btrfs_start_transaction(root, 0); | |
752 | if (IS_ERR(trans)) { | |
753 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
754 | return PTR_ERR(trans); | |
755 | } | |
3a45bb20 | 756 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
757 | WARN_ON(ret); |
758 | if (tgt_device) | |
759 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
760 | ||
761 | leave: | |
762 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
763 | return result; | |
764 | } | |
765 | ||
766 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
767 | { | |
768 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
769 | ||
770 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
73beece9 | 771 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
772 | switch (dev_replace->replace_state) { |
773 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
774 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
775 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
776 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
777 | break; | |
778 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
779 | dev_replace->replace_state = | |
780 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
4546bcae | 781 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 | 782 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 783 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
784 | break; |
785 | } | |
786 | ||
73beece9 | 787 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
788 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
789 | } | |
790 | ||
791 | /* resume dev_replace procedure that was interrupted by unmount */ | |
792 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
793 | { | |
794 | struct task_struct *task; | |
795 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
796 | ||
73beece9 | 797 | btrfs_dev_replace_lock(dev_replace, 1); |
e93c89c1 SB |
798 | switch (dev_replace->replace_state) { |
799 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
800 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
801 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
73beece9 | 802 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
803 | return 0; |
804 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
805 | break; | |
806 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
807 | dev_replace->replace_state = | |
808 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
809 | break; | |
810 | } | |
811 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 | 812 | btrfs_info(fs_info, |
5d163e0e JM |
813 | "cannot continue dev_replace, tgtdev is missing"); |
814 | btrfs_info(fs_info, | |
815 | "you may cancel the operation after 'mount -o degraded'"); | |
0107b330 AJ |
816 | dev_replace->replace_state = |
817 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
73beece9 | 818 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 SB |
819 | return 0; |
820 | } | |
73beece9 | 821 | btrfs_dev_replace_unlock(dev_replace, 1); |
e93c89c1 | 822 | |
171938e5 | 823 | WARN_ON(test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); |
e93c89c1 | 824 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
8c6ffba0 | 825 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
826 | } |
827 | ||
828 | static int btrfs_dev_replace_kthread(void *data) | |
829 | { | |
830 | struct btrfs_fs_info *fs_info = data; | |
831 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
e93c89c1 SB |
832 | u64 progress; |
833 | ||
f1b8a1e8 DS |
834 | progress = btrfs_dev_replace_progress(fs_info); |
835 | progress = div_u64(progress, 10); | |
836 | btrfs_info_in_rcu(fs_info, | |
837 | "continuing dev_replace from %s (devid %llu) to %s @%u%%", | |
838 | dev_replace->srcdev->missing ? "<missing disk>" | |
839 | : rcu_str_deref(dev_replace->srcdev->name), | |
840 | dev_replace->srcdev->devid, | |
841 | dev_replace->tgtdev ? rcu_str_deref(dev_replace->tgtdev->name) | |
842 | : "<missing target disk>", | |
843 | (unsigned int)progress); | |
844 | ||
e93c89c1 | 845 | btrfs_dev_replace_continue_on_mount(fs_info); |
171938e5 | 846 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
e93c89c1 SB |
847 | |
848 | return 0; | |
849 | } | |
850 | ||
851 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) | |
852 | { | |
853 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
854 | int ret; | |
855 | ||
856 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, | |
857 | dev_replace->committed_cursor_left, | |
7cc8e58d | 858 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
859 | &dev_replace->scrub_progress, 0, 1); |
860 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
861 | WARN_ON(ret); | |
862 | return 0; | |
863 | } | |
864 | ||
865 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) | |
866 | { | |
867 | if (!dev_replace->is_valid) | |
868 | return 0; | |
869 | ||
870 | switch (dev_replace->replace_state) { | |
871 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
872 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
873 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
874 | return 0; | |
875 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
876 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
877 | /* | |
878 | * return true even if tgtdev is missing (this is | |
879 | * something that can happen if the dev_replace | |
880 | * procedure is suspended by an umount and then | |
881 | * the tgtdev is missing (or "btrfs dev scan") was | |
882 | * not called and the the filesystem is remounted | |
883 | * in degraded state. This does not stop the | |
884 | * dev_replace procedure. It needs to be canceled | |
bb7ab3b9 | 885 | * manually if the cancellation is wanted. |
e93c89c1 SB |
886 | */ |
887 | break; | |
888 | } | |
889 | return 1; | |
890 | } | |
891 | ||
73beece9 | 892 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace, int rw) |
e93c89c1 | 893 | { |
73beece9 LB |
894 | if (rw == 1) { |
895 | /* write */ | |
896 | again: | |
897 | wait_event(dev_replace->read_lock_wq, | |
898 | atomic_read(&dev_replace->blocking_readers) == 0); | |
899 | write_lock(&dev_replace->lock); | |
900 | if (atomic_read(&dev_replace->blocking_readers)) { | |
901 | write_unlock(&dev_replace->lock); | |
902 | goto again; | |
903 | } | |
904 | } else { | |
905 | read_lock(&dev_replace->lock); | |
906 | atomic_inc(&dev_replace->read_locks); | |
e93c89c1 | 907 | } |
73beece9 | 908 | } |
e93c89c1 | 909 | |
73beece9 LB |
910 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace, int rw) |
911 | { | |
912 | if (rw == 1) { | |
913 | /* write */ | |
914 | ASSERT(atomic_read(&dev_replace->blocking_readers) == 0); | |
915 | write_unlock(&dev_replace->lock); | |
916 | } else { | |
917 | ASSERT(atomic_read(&dev_replace->read_locks) > 0); | |
918 | atomic_dec(&dev_replace->read_locks); | |
919 | read_unlock(&dev_replace->lock); | |
e93c89c1 | 920 | } |
73beece9 | 921 | } |
e93c89c1 | 922 | |
73beece9 LB |
923 | /* inc blocking cnt and release read lock */ |
924 | void btrfs_dev_replace_set_lock_blocking( | |
925 | struct btrfs_dev_replace *dev_replace) | |
926 | { | |
927 | /* only set blocking for read lock */ | |
928 | ASSERT(atomic_read(&dev_replace->read_locks) > 0); | |
929 | atomic_inc(&dev_replace->blocking_readers); | |
930 | read_unlock(&dev_replace->lock); | |
e93c89c1 SB |
931 | } |
932 | ||
73beece9 LB |
933 | /* acquire read lock and dec blocking cnt */ |
934 | void btrfs_dev_replace_clear_lock_blocking( | |
935 | struct btrfs_dev_replace *dev_replace) | |
e93c89c1 | 936 | { |
73beece9 LB |
937 | /* only set blocking for read lock */ |
938 | ASSERT(atomic_read(&dev_replace->read_locks) > 0); | |
939 | ASSERT(atomic_read(&dev_replace->blocking_readers) > 0); | |
940 | read_lock(&dev_replace->lock); | |
941 | if (atomic_dec_and_test(&dev_replace->blocking_readers) && | |
942 | waitqueue_active(&dev_replace->read_lock_wq)) | |
943 | wake_up(&dev_replace->read_lock_wq); | |
e93c89c1 | 944 | } |
c404e0dc MX |
945 | |
946 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) | |
947 | { | |
948 | percpu_counter_inc(&fs_info->bio_counter); | |
949 | } | |
950 | ||
4245215d | 951 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
c404e0dc | 952 | { |
4245215d | 953 | percpu_counter_sub(&fs_info->bio_counter, amount); |
c404e0dc MX |
954 | |
955 | if (waitqueue_active(&fs_info->replace_wait)) | |
956 | wake_up(&fs_info->replace_wait); | |
957 | } | |
958 | ||
959 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
960 | { | |
09dd7a01 ZL |
961 | while (1) { |
962 | percpu_counter_inc(&fs_info->bio_counter); | |
963 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, | |
964 | &fs_info->fs_state))) | |
965 | break; | |
966 | ||
c404e0dc MX |
967 | btrfs_bio_counter_dec(fs_info); |
968 | wait_event(fs_info->replace_wait, | |
969 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, | |
970 | &fs_info->fs_state)); | |
c404e0dc | 971 | } |
c404e0dc | 972 | } |