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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e93c89c1 SB |
2 | /* |
3 | * Copyright (C) STRATO AG 2012. All rights reserved. | |
e93c89c1 | 4 | */ |
c1d7c514 | 5 | |
e93c89c1 SB |
6 | #include <linux/sched.h> |
7 | #include <linux/bio.h> | |
8 | #include <linux/slab.h> | |
e93c89c1 | 9 | #include <linux/blkdev.h> |
e93c89c1 SB |
10 | #include <linux/kthread.h> |
11 | #include <linux/math64.h> | |
e93c89c1 SB |
12 | #include "ctree.h" |
13 | #include "extent_map.h" | |
14 | #include "disk-io.h" | |
15 | #include "transaction.h" | |
16 | #include "print-tree.h" | |
17 | #include "volumes.h" | |
18 | #include "async-thread.h" | |
19 | #include "check-integrity.h" | |
20 | #include "rcu-string.h" | |
21 | #include "dev-replace.h" | |
49c6f736 | 22 | #include "sysfs.h" |
e93c89c1 | 23 | |
e93c89c1 SB |
24 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
25 | int scrub_ret); | |
26 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
27 | struct btrfs_fs_info *fs_info, | |
28 | struct btrfs_device *srcdev, | |
29 | struct btrfs_device *tgtdev); | |
e93c89c1 | 30 | static int btrfs_dev_replace_kthread(void *data); |
e93c89c1 SB |
31 | |
32 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
33 | { | |
34 | struct btrfs_key key; | |
35 | struct btrfs_root *dev_root = fs_info->dev_root; | |
36 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
37 | struct extent_buffer *eb; | |
38 | int slot; | |
39 | int ret = 0; | |
40 | struct btrfs_path *path = NULL; | |
41 | int item_size; | |
42 | struct btrfs_dev_replace_item *ptr; | |
43 | u64 src_devid; | |
44 | ||
45 | path = btrfs_alloc_path(); | |
46 | if (!path) { | |
47 | ret = -ENOMEM; | |
48 | goto out; | |
49 | } | |
50 | ||
51 | key.objectid = 0; | |
52 | key.type = BTRFS_DEV_REPLACE_KEY; | |
53 | key.offset = 0; | |
54 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
55 | if (ret) { | |
56 | no_valid_dev_replace_entry_found: | |
57 | ret = 0; | |
58 | dev_replace->replace_state = | |
59 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; | |
60 | dev_replace->cont_reading_from_srcdev_mode = | |
61 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
62 | dev_replace->replace_state = 0; | |
63 | dev_replace->time_started = 0; | |
64 | dev_replace->time_stopped = 0; | |
65 | atomic64_set(&dev_replace->num_write_errors, 0); | |
66 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
67 | dev_replace->cursor_left = 0; | |
68 | dev_replace->committed_cursor_left = 0; | |
69 | dev_replace->cursor_left_last_write_of_item = 0; | |
70 | dev_replace->cursor_right = 0; | |
71 | dev_replace->srcdev = NULL; | |
72 | dev_replace->tgtdev = NULL; | |
73 | dev_replace->is_valid = 0; | |
74 | dev_replace->item_needs_writeback = 0; | |
75 | goto out; | |
76 | } | |
77 | slot = path->slots[0]; | |
78 | eb = path->nodes[0]; | |
79 | item_size = btrfs_item_size_nr(eb, slot); | |
80 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); | |
81 | ||
82 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
efe120a0 FH |
83 | btrfs_warn(fs_info, |
84 | "dev_replace entry found has unexpected size, ignore entry"); | |
e93c89c1 SB |
85 | goto no_valid_dev_replace_entry_found; |
86 | } | |
87 | ||
88 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
89 | dev_replace->cont_reading_from_srcdev_mode = | |
90 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
91 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
92 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
93 | dev_replace->time_stopped = | |
94 | btrfs_dev_replace_time_stopped(eb, ptr); | |
95 | atomic64_set(&dev_replace->num_write_errors, | |
96 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
97 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
98 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
99 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
100 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
101 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
102 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
103 | dev_replace->is_valid = 1; | |
104 | ||
105 | dev_replace->item_needs_writeback = 0; | |
106 | switch (dev_replace->replace_state) { | |
107 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
108 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
109 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
110 | dev_replace->srcdev = NULL; | |
111 | dev_replace->tgtdev = NULL; | |
112 | break; | |
113 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
114 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
115 | dev_replace->srcdev = btrfs_find_device(fs_info, src_devid, | |
116 | NULL, NULL); | |
117 | dev_replace->tgtdev = btrfs_find_device(fs_info, | |
118 | BTRFS_DEV_REPLACE_DEVID, | |
119 | NULL, NULL); | |
120 | /* | |
121 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
122 | * missing | |
123 | */ | |
124 | if (!dev_replace->srcdev && | |
0b246afa | 125 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 126 | ret = -EIO; |
efe120a0 FH |
127 | btrfs_warn(fs_info, |
128 | "cannot mount because device replace operation is ongoing and"); | |
129 | btrfs_warn(fs_info, | |
130 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
131 | src_devid); | |
e93c89c1 SB |
132 | } |
133 | if (!dev_replace->tgtdev && | |
0b246afa | 134 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 135 | ret = -EIO; |
efe120a0 FH |
136 | btrfs_warn(fs_info, |
137 | "cannot mount because device replace operation is ongoing and"); | |
138 | btrfs_warn(fs_info, | |
139 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
6e71c47a | 140 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
141 | } |
142 | if (dev_replace->tgtdev) { | |
143 | if (dev_replace->srcdev) { | |
144 | dev_replace->tgtdev->total_bytes = | |
145 | dev_replace->srcdev->total_bytes; | |
146 | dev_replace->tgtdev->disk_total_bytes = | |
147 | dev_replace->srcdev->disk_total_bytes; | |
935e5cc9 MX |
148 | dev_replace->tgtdev->commit_total_bytes = |
149 | dev_replace->srcdev->commit_total_bytes; | |
e93c89c1 SB |
150 | dev_replace->tgtdev->bytes_used = |
151 | dev_replace->srcdev->bytes_used; | |
ce7213c7 MX |
152 | dev_replace->tgtdev->commit_bytes_used = |
153 | dev_replace->srcdev->commit_bytes_used; | |
e93c89c1 | 154 | } |
401e29c1 AJ |
155 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, |
156 | &dev_replace->tgtdev->dev_state); | |
15fc1283 AJ |
157 | |
158 | WARN_ON(fs_info->fs_devices->rw_devices == 0); | |
159 | dev_replace->tgtdev->io_width = fs_info->sectorsize; | |
160 | dev_replace->tgtdev->io_align = fs_info->sectorsize; | |
161 | dev_replace->tgtdev->sector_size = fs_info->sectorsize; | |
162 | dev_replace->tgtdev->fs_info = fs_info; | |
163 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, | |
164 | &dev_replace->tgtdev->dev_state); | |
e93c89c1 SB |
165 | } |
166 | break; | |
167 | } | |
168 | ||
169 | out: | |
527afb44 | 170 | btrfs_free_path(path); |
e93c89c1 SB |
171 | return ret; |
172 | } | |
173 | ||
d48f39d5 DS |
174 | /* |
175 | * Initialize a new device for device replace target from a given source dev | |
176 | * and path. | |
177 | * | |
178 | * Return 0 and new device in @device_out, otherwise return < 0 | |
179 | */ | |
180 | static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
181 | const char *device_path, | |
182 | struct btrfs_device *srcdev, | |
183 | struct btrfs_device **device_out) | |
184 | { | |
185 | struct btrfs_device *device; | |
186 | struct block_device *bdev; | |
187 | struct list_head *devices; | |
188 | struct rcu_string *name; | |
189 | u64 devid = BTRFS_DEV_REPLACE_DEVID; | |
190 | int ret = 0; | |
191 | ||
192 | *device_out = NULL; | |
193 | if (fs_info->fs_devices->seeding) { | |
194 | btrfs_err(fs_info, "the filesystem is a seed filesystem!"); | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, | |
199 | fs_info->bdev_holder); | |
200 | if (IS_ERR(bdev)) { | |
201 | btrfs_err(fs_info, "target device %s is invalid!", device_path); | |
202 | return PTR_ERR(bdev); | |
203 | } | |
204 | ||
205 | filemap_write_and_wait(bdev->bd_inode->i_mapping); | |
206 | ||
207 | devices = &fs_info->fs_devices->devices; | |
208 | list_for_each_entry(device, devices, dev_list) { | |
209 | if (device->bdev == bdev) { | |
210 | btrfs_err(fs_info, | |
211 | "target device is in the filesystem!"); | |
212 | ret = -EEXIST; | |
213 | goto error; | |
214 | } | |
215 | } | |
216 | ||
217 | ||
218 | if (i_size_read(bdev->bd_inode) < | |
219 | btrfs_device_get_total_bytes(srcdev)) { | |
220 | btrfs_err(fs_info, | |
221 | "target device is smaller than source device!"); | |
222 | ret = -EINVAL; | |
223 | goto error; | |
224 | } | |
225 | ||
226 | ||
227 | device = btrfs_alloc_device(NULL, &devid, NULL); | |
228 | if (IS_ERR(device)) { | |
229 | ret = PTR_ERR(device); | |
230 | goto error; | |
231 | } | |
232 | ||
233 | name = rcu_string_strdup(device_path, GFP_KERNEL); | |
234 | if (!name) { | |
235 | btrfs_free_device(device); | |
236 | ret = -ENOMEM; | |
237 | goto error; | |
238 | } | |
239 | rcu_assign_pointer(device->name, name); | |
240 | ||
241 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
242 | set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); | |
243 | device->generation = 0; | |
244 | device->io_width = fs_info->sectorsize; | |
245 | device->io_align = fs_info->sectorsize; | |
246 | device->sector_size = fs_info->sectorsize; | |
247 | device->total_bytes = btrfs_device_get_total_bytes(srcdev); | |
248 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); | |
249 | device->bytes_used = btrfs_device_get_bytes_used(srcdev); | |
250 | device->commit_total_bytes = srcdev->commit_total_bytes; | |
251 | device->commit_bytes_used = device->bytes_used; | |
252 | device->fs_info = fs_info; | |
253 | device->bdev = bdev; | |
254 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); | |
255 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); | |
256 | device->mode = FMODE_EXCL; | |
257 | device->dev_stats_valid = 1; | |
258 | set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE); | |
259 | device->fs_devices = fs_info->fs_devices; | |
260 | list_add(&device->dev_list, &fs_info->fs_devices->devices); | |
261 | fs_info->fs_devices->num_devices++; | |
262 | fs_info->fs_devices->open_devices++; | |
263 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
264 | ||
265 | *device_out = device; | |
266 | return 0; | |
267 | ||
268 | error: | |
269 | blkdev_put(bdev, FMODE_EXCL); | |
270 | return ret; | |
271 | } | |
272 | ||
e93c89c1 SB |
273 | /* |
274 | * called from commit_transaction. Writes changed device replace state to | |
275 | * disk. | |
276 | */ | |
277 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans, | |
278 | struct btrfs_fs_info *fs_info) | |
279 | { | |
280 | int ret; | |
281 | struct btrfs_root *dev_root = fs_info->dev_root; | |
282 | struct btrfs_path *path; | |
283 | struct btrfs_key key; | |
284 | struct extent_buffer *eb; | |
285 | struct btrfs_dev_replace_item *ptr; | |
286 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
287 | ||
7e79cb86 | 288 | btrfs_dev_replace_read_lock(dev_replace); |
e93c89c1 SB |
289 | if (!dev_replace->is_valid || |
290 | !dev_replace->item_needs_writeback) { | |
7e79cb86 | 291 | btrfs_dev_replace_read_unlock(dev_replace); |
e93c89c1 SB |
292 | return 0; |
293 | } | |
7e79cb86 | 294 | btrfs_dev_replace_read_unlock(dev_replace); |
e93c89c1 SB |
295 | |
296 | key.objectid = 0; | |
297 | key.type = BTRFS_DEV_REPLACE_KEY; | |
298 | key.offset = 0; | |
299 | ||
300 | path = btrfs_alloc_path(); | |
301 | if (!path) { | |
302 | ret = -ENOMEM; | |
303 | goto out; | |
304 | } | |
305 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
306 | if (ret < 0) { | |
5d163e0e JM |
307 | btrfs_warn(fs_info, |
308 | "error %d while searching for dev_replace item!", | |
309 | ret); | |
e93c89c1 SB |
310 | goto out; |
311 | } | |
312 | ||
313 | if (ret == 0 && | |
314 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
315 | /* | |
316 | * need to delete old one and insert a new one. | |
317 | * Since no attempt is made to recover any old state, if the | |
318 | * dev_replace state is 'running', the data on the target | |
319 | * drive is lost. | |
320 | * It would be possible to recover the state: just make sure | |
321 | * that the beginning of the item is never changed and always | |
322 | * contains all the essential information. Then read this | |
323 | * minimal set of information and use it as a base for the | |
324 | * new state. | |
325 | */ | |
326 | ret = btrfs_del_item(trans, dev_root, path); | |
327 | if (ret != 0) { | |
5d163e0e JM |
328 | btrfs_warn(fs_info, |
329 | "delete too small dev_replace item failed %d!", | |
330 | ret); | |
e93c89c1 SB |
331 | goto out; |
332 | } | |
333 | ret = 1; | |
334 | } | |
335 | ||
336 | if (ret == 1) { | |
337 | /* need to insert a new item */ | |
338 | btrfs_release_path(path); | |
339 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
340 | &key, sizeof(*ptr)); | |
341 | if (ret < 0) { | |
5d163e0e JM |
342 | btrfs_warn(fs_info, |
343 | "insert dev_replace item failed %d!", ret); | |
e93c89c1 SB |
344 | goto out; |
345 | } | |
346 | } | |
347 | ||
348 | eb = path->nodes[0]; | |
349 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
350 | struct btrfs_dev_replace_item); | |
351 | ||
7e79cb86 | 352 | btrfs_dev_replace_write_lock(dev_replace); |
e93c89c1 SB |
353 | if (dev_replace->srcdev) |
354 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
355 | dev_replace->srcdev->devid); | |
356 | else | |
357 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
358 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
359 | dev_replace->cont_reading_from_srcdev_mode); | |
360 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
361 | dev_replace->replace_state); | |
362 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
363 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
364 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
365 | atomic64_read(&dev_replace->num_write_errors)); | |
366 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
367 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
368 | dev_replace->cursor_left_last_write_of_item = | |
369 | dev_replace->cursor_left; | |
370 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
371 | dev_replace->cursor_left_last_write_of_item); | |
372 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
373 | dev_replace->cursor_right); | |
374 | dev_replace->item_needs_writeback = 0; | |
7e79cb86 | 375 | btrfs_dev_replace_write_unlock(dev_replace); |
e93c89c1 SB |
376 | |
377 | btrfs_mark_buffer_dirty(eb); | |
378 | ||
379 | out: | |
380 | btrfs_free_path(path); | |
381 | ||
382 | return ret; | |
383 | } | |
384 | ||
3c958bd2 AJ |
385 | static char* btrfs_dev_name(struct btrfs_device *device) |
386 | { | |
acf18c56 | 387 | if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) |
3c958bd2 AJ |
388 | return "<missing disk>"; |
389 | else | |
390 | return rcu_str_deref(device->name); | |
391 | } | |
392 | ||
da353f6b DS |
393 | int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
394 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, | |
395 | int read_src) | |
e93c89c1 | 396 | { |
2ff7e61e | 397 | struct btrfs_root *root = fs_info->dev_root; |
e93c89c1 | 398 | struct btrfs_trans_handle *trans; |
e93c89c1 SB |
399 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
400 | int ret; | |
401 | struct btrfs_device *tgt_device = NULL; | |
402 | struct btrfs_device *src_device = NULL; | |
aa144bfe | 403 | bool need_unlock; |
e93c89c1 | 404 | |
a27a94c2 NB |
405 | src_device = btrfs_find_device_by_devspec(fs_info, srcdevid, |
406 | srcdev_name); | |
407 | if (IS_ERR(src_device)) | |
408 | return PTR_ERR(src_device); | |
e93c89c1 | 409 | |
2ff7e61e | 410 | ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name, |
1c43366d | 411 | src_device, &tgt_device); |
1c43366d MX |
412 | if (ret) |
413 | return ret; | |
e93c89c1 | 414 | |
9e271ae2 AJ |
415 | /* |
416 | * Here we commit the transaction to make sure commit_total_bytes | |
417 | * of all the devices are updated. | |
418 | */ | |
419 | trans = btrfs_attach_transaction(root); | |
420 | if (!IS_ERR(trans)) { | |
3a45bb20 | 421 | ret = btrfs_commit_transaction(trans); |
9e271ae2 AJ |
422 | if (ret) |
423 | return ret; | |
424 | } else if (PTR_ERR(trans) != -ENOENT) { | |
425 | return PTR_ERR(trans); | |
426 | } | |
427 | ||
aa144bfe | 428 | need_unlock = true; |
7e79cb86 | 429 | btrfs_dev_replace_write_lock(dev_replace); |
e93c89c1 SB |
430 | switch (dev_replace->replace_state) { |
431 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
432 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
433 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
434 | break; | |
435 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
436 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
5c061471 | 437 | ASSERT(0); |
b5255456 | 438 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
e93c89c1 SB |
439 | goto leave; |
440 | } | |
441 | ||
b5255456 | 442 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
e93c89c1 SB |
443 | WARN_ON(!src_device); |
444 | dev_replace->srcdev = src_device; | |
e93c89c1 SB |
445 | dev_replace->tgtdev = tgt_device; |
446 | ||
fc23c246 | 447 | btrfs_info_in_rcu(fs_info, |
ecaeb14b | 448 | "dev_replace from %s (devid %llu) to %s started", |
3c958bd2 | 449 | btrfs_dev_name(src_device), |
e93c89c1 SB |
450 | src_device->devid, |
451 | rcu_str_deref(tgt_device->name)); | |
452 | ||
e93c89c1 SB |
453 | /* |
454 | * from now on, the writes to the srcdev are all duplicated to | |
455 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
456 | */ | |
457 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
a944442c | 458 | dev_replace->time_started = ktime_get_real_seconds(); |
e93c89c1 SB |
459 | dev_replace->cursor_left = 0; |
460 | dev_replace->committed_cursor_left = 0; | |
461 | dev_replace->cursor_left_last_write_of_item = 0; | |
462 | dev_replace->cursor_right = 0; | |
463 | dev_replace->is_valid = 1; | |
464 | dev_replace->item_needs_writeback = 1; | |
7ccefb98 YK |
465 | atomic64_set(&dev_replace->num_write_errors, 0); |
466 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
7e79cb86 | 467 | btrfs_dev_replace_write_unlock(dev_replace); |
aa144bfe | 468 | need_unlock = false; |
e93c89c1 | 469 | |
73416dab LB |
470 | ret = btrfs_sysfs_add_device_link(tgt_device->fs_devices, tgt_device); |
471 | if (ret) | |
ab8d0fc4 | 472 | btrfs_err(fs_info, "kobj add dev failed %d", ret); |
73416dab | 473 | |
6374e57a | 474 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 SB |
475 | |
476 | /* force writing the updated state information to disk */ | |
477 | trans = btrfs_start_transaction(root, 0); | |
478 | if (IS_ERR(trans)) { | |
479 | ret = PTR_ERR(trans); | |
aa144bfe | 480 | need_unlock = true; |
7e79cb86 | 481 | btrfs_dev_replace_write_lock(dev_replace); |
5c061471 JM |
482 | dev_replace->replace_state = |
483 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; | |
484 | dev_replace->srcdev = NULL; | |
485 | dev_replace->tgtdev = NULL; | |
e93c89c1 SB |
486 | goto leave; |
487 | } | |
488 | ||
3a45bb20 | 489 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
490 | WARN_ON(ret); |
491 | ||
492 | /* the disk copy procedure reuses the scrub code */ | |
493 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 494 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
495 | &dev_replace->scrub_progress, 0, 1); |
496 | ||
fc23c246 | 497 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
2fc9f6ba | 498 | if (ret == -EINPROGRESS) { |
b5255456 | 499 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
2fc9f6ba EG |
500 | } else { |
501 | WARN_ON(ret); | |
502 | } | |
e93c89c1 | 503 | |
2fc9f6ba | 504 | return ret; |
e93c89c1 SB |
505 | |
506 | leave: | |
aa144bfe DS |
507 | if (need_unlock) |
508 | btrfs_dev_replace_write_unlock(dev_replace); | |
4f5ad7bd | 509 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
e93c89c1 SB |
510 | return ret; |
511 | } | |
512 | ||
2ff7e61e | 513 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
b5255456 AJ |
514 | struct btrfs_ioctl_dev_replace_args *args) |
515 | { | |
516 | int ret; | |
517 | ||
518 | switch (args->start.cont_reading_from_srcdev_mode) { | |
519 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
520 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
521 | break; | |
522 | default: | |
523 | return -EINVAL; | |
524 | } | |
525 | ||
526 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
527 | args->start.tgtdev_name[0] == '\0') | |
528 | return -EINVAL; | |
529 | ||
2ff7e61e | 530 | ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name, |
b5255456 AJ |
531 | args->start.srcdevid, |
532 | args->start.srcdev_name, | |
533 | args->start.cont_reading_from_srcdev_mode); | |
534 | args->result = ret; | |
535 | /* don't warn if EINPROGRESS, someone else might be running scrub */ | |
536 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS) | |
537 | ret = 0; | |
538 | ||
539 | return ret; | |
540 | } | |
541 | ||
c404e0dc | 542 | /* |
01327610 | 543 | * blocked until all in-flight bios operations are finished. |
c404e0dc MX |
544 | */ |
545 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
546 | { | |
c404e0dc | 547 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
7f8d236a DS |
548 | wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum( |
549 | &fs_info->dev_replace.bio_counter)); | |
c404e0dc MX |
550 | } |
551 | ||
552 | /* | |
553 | * we have removed target device, it is safe to allow new bios request. | |
554 | */ | |
555 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
556 | { | |
557 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
7f8d236a | 558 | wake_up(&fs_info->dev_replace.replace_wait); |
c404e0dc MX |
559 | } |
560 | ||
e93c89c1 SB |
561 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
562 | int scrub_ret) | |
563 | { | |
564 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
565 | struct btrfs_device *tgt_device; | |
566 | struct btrfs_device *src_device; | |
567 | struct btrfs_root *root = fs_info->tree_root; | |
568 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
569 | struct btrfs_trans_handle *trans; | |
570 | int ret = 0; | |
571 | ||
572 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
573 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
574 | ||
7e79cb86 | 575 | btrfs_dev_replace_read_lock(dev_replace); |
e93c89c1 SB |
576 | /* was the operation canceled, or is it finished? */ |
577 | if (dev_replace->replace_state != | |
578 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
7e79cb86 | 579 | btrfs_dev_replace_read_unlock(dev_replace); |
e93c89c1 SB |
580 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
581 | return 0; | |
582 | } | |
583 | ||
584 | tgt_device = dev_replace->tgtdev; | |
585 | src_device = dev_replace->srcdev; | |
7e79cb86 | 586 | btrfs_dev_replace_read_unlock(dev_replace); |
e93c89c1 | 587 | |
e93c89c1 SB |
588 | /* |
589 | * flush all outstanding I/O and inode extent mappings before the | |
590 | * copy operation is declared as being finished | |
591 | */ | |
82b3e53b | 592 | ret = btrfs_start_delalloc_roots(fs_info, -1); |
3edb2a68 MX |
593 | if (ret) { |
594 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
595 | return ret; | |
596 | } | |
6374e57a | 597 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 SB |
598 | |
599 | trans = btrfs_start_transaction(root, 0); | |
600 | if (IS_ERR(trans)) { | |
601 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
602 | return PTR_ERR(trans); | |
603 | } | |
3a45bb20 | 604 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
605 | WARN_ON(ret); |
606 | ||
607 | /* keep away write_all_supers() during the finishing procedure */ | |
0b246afa JM |
608 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
609 | mutex_lock(&fs_info->chunk_mutex); | |
7e79cb86 | 610 | btrfs_dev_replace_write_lock(dev_replace); |
e93c89c1 SB |
611 | dev_replace->replace_state = |
612 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
613 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
614 | dev_replace->tgtdev = NULL; | |
615 | dev_replace->srcdev = NULL; | |
a944442c | 616 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 SB |
617 | dev_replace->item_needs_writeback = 1; |
618 | ||
c404e0dc MX |
619 | /* replace old device with new one in mapping tree */ |
620 | if (!scrub_ret) { | |
621 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, | |
622 | src_device, | |
623 | tgt_device); | |
624 | } else { | |
0b246afa JM |
625 | btrfs_err_in_rcu(fs_info, |
626 | "btrfs_scrub_dev(%s, %llu, %s) failed %d", | |
3c958bd2 | 627 | btrfs_dev_name(src_device), |
0b246afa JM |
628 | src_device->devid, |
629 | rcu_str_deref(tgt_device->name), scrub_ret); | |
7e79cb86 | 630 | btrfs_dev_replace_write_unlock(dev_replace); |
0b246afa JM |
631 | mutex_unlock(&fs_info->chunk_mutex); |
632 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
ae6529c3 | 633 | btrfs_rm_dev_replace_blocked(fs_info); |
e93c89c1 | 634 | if (tgt_device) |
4f5ad7bd | 635 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
ae6529c3 | 636 | btrfs_rm_dev_replace_unblocked(fs_info); |
e93c89c1 SB |
637 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
638 | ||
2fc9f6ba | 639 | return scrub_ret; |
e93c89c1 SB |
640 | } |
641 | ||
0b246afa JM |
642 | btrfs_info_in_rcu(fs_info, |
643 | "dev_replace from %s (devid %llu) to %s finished", | |
3c958bd2 | 644 | btrfs_dev_name(src_device), |
0b246afa JM |
645 | src_device->devid, |
646 | rcu_str_deref(tgt_device->name)); | |
401e29c1 | 647 | clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &tgt_device->dev_state); |
e93c89c1 SB |
648 | tgt_device->devid = src_device->devid; |
649 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
650 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
651 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
652 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
653 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
654 | btrfs_device_set_disk_total_bytes(tgt_device, | |
655 | src_device->disk_total_bytes); | |
656 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
935e5cc9 MX |
657 | ASSERT(list_empty(&src_device->resized_list)); |
658 | tgt_device->commit_total_bytes = src_device->commit_total_bytes; | |
ce7213c7 | 659 | tgt_device->commit_bytes_used = src_device->bytes_used; |
88acff64 | 660 | |
d6507cf1 | 661 | btrfs_assign_next_active_device(src_device, tgt_device); |
88acff64 | 662 | |
e93c89c1 | 663 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); |
82372bc8 | 664 | fs_info->fs_devices->rw_devices++; |
e93c89c1 | 665 | |
7e79cb86 | 666 | btrfs_dev_replace_write_unlock(dev_replace); |
12b894cb | 667 | |
c404e0dc MX |
668 | btrfs_rm_dev_replace_blocked(fs_info); |
669 | ||
68a9db5f | 670 | btrfs_rm_dev_replace_remove_srcdev(src_device); |
1357272f | 671 | |
c404e0dc MX |
672 | btrfs_rm_dev_replace_unblocked(fs_info); |
673 | ||
1e7e1f9e MT |
674 | /* |
675 | * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will | |
676 | * update on-disk dev stats value during commit transaction | |
677 | */ | |
678 | atomic_inc(&tgt_device->dev_stats_ccnt); | |
679 | ||
e93c89c1 SB |
680 | /* |
681 | * this is again a consistent state where no dev_replace procedure | |
682 | * is running, the target device is part of the filesystem, the | |
683 | * source device is not part of the filesystem anymore and its 1st | |
684 | * superblock is scratched out so that it is no longer marked to | |
685 | * belong to this filesystem. | |
686 | */ | |
0b246afa JM |
687 | mutex_unlock(&fs_info->chunk_mutex); |
688 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
e93c89c1 | 689 | |
084b6e7c | 690 | /* replace the sysfs entry */ |
32576040 | 691 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, src_device); |
084b6e7c QW |
692 | btrfs_rm_dev_replace_free_srcdev(fs_info, src_device); |
693 | ||
e93c89c1 SB |
694 | /* write back the superblocks */ |
695 | trans = btrfs_start_transaction(root, 0); | |
696 | if (!IS_ERR(trans)) | |
3a45bb20 | 697 | btrfs_commit_transaction(trans); |
e93c89c1 SB |
698 | |
699 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
704 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
705 | struct btrfs_fs_info *fs_info, | |
706 | struct btrfs_device *srcdev, | |
707 | struct btrfs_device *tgtdev) | |
708 | { | |
709 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; | |
710 | struct extent_map *em; | |
711 | struct map_lookup *map; | |
712 | u64 start = 0; | |
713 | int i; | |
714 | ||
715 | write_lock(&em_tree->lock); | |
716 | do { | |
717 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
718 | if (!em) | |
719 | break; | |
95617d69 | 720 | map = em->map_lookup; |
e93c89c1 SB |
721 | for (i = 0; i < map->num_stripes; i++) |
722 | if (srcdev == map->stripes[i].dev) | |
723 | map->stripes[i].dev = tgtdev; | |
724 | start = em->start + em->len; | |
725 | free_extent_map(em); | |
726 | } while (start); | |
727 | write_unlock(&em_tree->lock); | |
728 | } | |
729 | ||
74b595fe DS |
730 | /* |
731 | * Read progress of device replace status according to the state and last | |
732 | * stored position. The value format is the same as for | |
733 | * btrfs_dev_replace::progress_1000 | |
734 | */ | |
735 | static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info) | |
736 | { | |
737 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
738 | u64 ret = 0; | |
739 | ||
740 | switch (dev_replace->replace_state) { | |
741 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
742 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
743 | ret = 0; | |
744 | break; | |
745 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
746 | ret = 1000; | |
747 | break; | |
748 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
749 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
750 | ret = div64_u64(dev_replace->cursor_left, | |
751 | div_u64(btrfs_device_get_total_bytes( | |
752 | dev_replace->srcdev), 1000)); | |
753 | break; | |
754 | } | |
755 | ||
756 | return ret; | |
757 | } | |
758 | ||
e93c89c1 SB |
759 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
760 | struct btrfs_ioctl_dev_replace_args *args) | |
761 | { | |
762 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
763 | ||
7e79cb86 | 764 | btrfs_dev_replace_read_lock(dev_replace); |
e93c89c1 SB |
765 | /* even if !dev_replace_is_valid, the values are good enough for |
766 | * the replace_status ioctl */ | |
767 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
768 | args->status.replace_state = dev_replace->replace_state; | |
769 | args->status.time_started = dev_replace->time_started; | |
770 | args->status.time_stopped = dev_replace->time_stopped; | |
771 | args->status.num_write_errors = | |
772 | atomic64_read(&dev_replace->num_write_errors); | |
773 | args->status.num_uncorrectable_read_errors = | |
774 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
74b595fe | 775 | args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); |
7e79cb86 | 776 | btrfs_dev_replace_read_unlock(dev_replace); |
e93c89c1 SB |
777 | } |
778 | ||
18e67c73 | 779 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
e93c89c1 SB |
780 | { |
781 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
782 | struct btrfs_device *tgt_device = NULL; | |
8f2ceaa7 | 783 | struct btrfs_device *src_device = NULL; |
e93c89c1 SB |
784 | struct btrfs_trans_handle *trans; |
785 | struct btrfs_root *root = fs_info->tree_root; | |
18e67c73 | 786 | int result; |
e93c89c1 SB |
787 | int ret; |
788 | ||
bc98a42c | 789 | if (sb_rdonly(fs_info->sb)) |
e649e587 ID |
790 | return -EROFS; |
791 | ||
e93c89c1 | 792 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
7e79cb86 | 793 | btrfs_dev_replace_write_lock(dev_replace); |
e93c89c1 SB |
794 | switch (dev_replace->replace_state) { |
795 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
796 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
797 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
798 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
7e79cb86 | 799 | btrfs_dev_replace_write_unlock(dev_replace); |
e93c89c1 SB |
800 | goto leave; |
801 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
802 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
803 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
804 | tgt_device = dev_replace->tgtdev; | |
8f2ceaa7 | 805 | src_device = dev_replace->srcdev; |
e93c89c1 SB |
806 | dev_replace->tgtdev = NULL; |
807 | dev_replace->srcdev = NULL; | |
808 | break; | |
809 | } | |
810 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
a944442c | 811 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 | 812 | dev_replace->item_needs_writeback = 1; |
7e79cb86 | 813 | btrfs_dev_replace_write_unlock(dev_replace); |
e93c89c1 SB |
814 | btrfs_scrub_cancel(fs_info); |
815 | ||
816 | trans = btrfs_start_transaction(root, 0); | |
817 | if (IS_ERR(trans)) { | |
818 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
819 | return PTR_ERR(trans); | |
820 | } | |
3a45bb20 | 821 | ret = btrfs_commit_transaction(trans); |
e93c89c1 | 822 | WARN_ON(ret); |
8f2ceaa7 AJ |
823 | |
824 | btrfs_info_in_rcu(fs_info, | |
825 | "dev_replace from %s (devid %llu) to %s canceled", | |
826 | btrfs_dev_name(src_device), src_device->devid, | |
827 | btrfs_dev_name(tgt_device)); | |
828 | ||
e93c89c1 | 829 | if (tgt_device) |
4f5ad7bd | 830 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
e93c89c1 SB |
831 | |
832 | leave: | |
833 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
834 | return result; | |
835 | } | |
836 | ||
837 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
838 | { | |
839 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
840 | ||
841 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
7e79cb86 | 842 | btrfs_dev_replace_write_lock(dev_replace); |
e93c89c1 SB |
843 | switch (dev_replace->replace_state) { |
844 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
845 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
846 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
847 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
848 | break; | |
849 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
850 | dev_replace->replace_state = | |
851 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
a944442c | 852 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 | 853 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 854 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
855 | break; |
856 | } | |
857 | ||
7e79cb86 | 858 | btrfs_dev_replace_write_unlock(dev_replace); |
e93c89c1 SB |
859 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
860 | } | |
861 | ||
862 | /* resume dev_replace procedure that was interrupted by unmount */ | |
863 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
864 | { | |
865 | struct task_struct *task; | |
866 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
867 | ||
7e79cb86 | 868 | btrfs_dev_replace_write_lock(dev_replace); |
e93c89c1 SB |
869 | switch (dev_replace->replace_state) { |
870 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
871 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
872 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
7e79cb86 | 873 | btrfs_dev_replace_write_unlock(dev_replace); |
e93c89c1 SB |
874 | return 0; |
875 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
876 | break; | |
877 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
878 | dev_replace->replace_state = | |
879 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
880 | break; | |
881 | } | |
882 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 | 883 | btrfs_info(fs_info, |
5d163e0e JM |
884 | "cannot continue dev_replace, tgtdev is missing"); |
885 | btrfs_info(fs_info, | |
886 | "you may cancel the operation after 'mount -o degraded'"); | |
7e79cb86 | 887 | btrfs_dev_replace_write_unlock(dev_replace); |
e93c89c1 SB |
888 | return 0; |
889 | } | |
7e79cb86 | 890 | btrfs_dev_replace_write_unlock(dev_replace); |
e93c89c1 | 891 | |
010a47bd DS |
892 | /* |
893 | * This could collide with a paused balance, but the exclusive op logic | |
894 | * should never allow both to start and pause. We don't want to allow | |
895 | * dev-replace to start anyway. | |
896 | */ | |
897 | if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { | |
898 | btrfs_info(fs_info, | |
899 | "cannot resume dev-replace, other exclusive operation running"); | |
900 | return 0; | |
901 | } | |
902 | ||
e93c89c1 | 903 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
8c6ffba0 | 904 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
905 | } |
906 | ||
907 | static int btrfs_dev_replace_kthread(void *data) | |
908 | { | |
909 | struct btrfs_fs_info *fs_info = data; | |
910 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
e93c89c1 | 911 | u64 progress; |
00251a52 | 912 | int ret; |
e93c89c1 | 913 | |
f1b8a1e8 DS |
914 | progress = btrfs_dev_replace_progress(fs_info); |
915 | progress = div_u64(progress, 10); | |
916 | btrfs_info_in_rcu(fs_info, | |
3c958bd2 AJ |
917 | "continuing dev_replace from %s (devid %llu) to target %s @%u%%", |
918 | btrfs_dev_name(dev_replace->srcdev), | |
f1b8a1e8 | 919 | dev_replace->srcdev->devid, |
3c958bd2 | 920 | btrfs_dev_name(dev_replace->tgtdev), |
f1b8a1e8 DS |
921 | (unsigned int)progress); |
922 | ||
e93c89c1 SB |
923 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
924 | dev_replace->committed_cursor_left, | |
7cc8e58d | 925 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
926 | &dev_replace->scrub_progress, 0, 1); |
927 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
928 | WARN_ON(ret); | |
00251a52 DS |
929 | |
930 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); | |
e93c89c1 SB |
931 | return 0; |
932 | } | |
933 | ||
934 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) | |
935 | { | |
936 | if (!dev_replace->is_valid) | |
937 | return 0; | |
938 | ||
939 | switch (dev_replace->replace_state) { | |
940 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
941 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
942 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
943 | return 0; | |
944 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
945 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
946 | /* | |
947 | * return true even if tgtdev is missing (this is | |
948 | * something that can happen if the dev_replace | |
949 | * procedure is suspended by an umount and then | |
950 | * the tgtdev is missing (or "btrfs dev scan") was | |
951 | * not called and the the filesystem is remounted | |
952 | * in degraded state. This does not stop the | |
953 | * dev_replace procedure. It needs to be canceled | |
bb7ab3b9 | 954 | * manually if the cancellation is wanted. |
e93c89c1 SB |
955 | */ |
956 | break; | |
957 | } | |
958 | return 1; | |
959 | } | |
960 | ||
7e79cb86 | 961 | void btrfs_dev_replace_read_lock(struct btrfs_dev_replace *dev_replace) |
e93c89c1 | 962 | { |
7e79cb86 | 963 | read_lock(&dev_replace->lock); |
7e79cb86 DS |
964 | } |
965 | ||
966 | void btrfs_dev_replace_read_unlock(struct btrfs_dev_replace *dev_replace) | |
967 | { | |
7e79cb86 | 968 | read_unlock(&dev_replace->lock); |
73beece9 | 969 | } |
e93c89c1 | 970 | |
7e79cb86 | 971 | void btrfs_dev_replace_write_lock(struct btrfs_dev_replace *dev_replace) |
73beece9 | 972 | { |
7e79cb86 DS |
973 | again: |
974 | wait_event(dev_replace->read_lock_wq, | |
975 | atomic_read(&dev_replace->blocking_readers) == 0); | |
976 | write_lock(&dev_replace->lock); | |
977 | if (atomic_read(&dev_replace->blocking_readers)) { | |
73beece9 | 978 | write_unlock(&dev_replace->lock); |
7e79cb86 | 979 | goto again; |
e93c89c1 | 980 | } |
73beece9 | 981 | } |
e93c89c1 | 982 | |
7e79cb86 DS |
983 | void btrfs_dev_replace_write_unlock(struct btrfs_dev_replace *dev_replace) |
984 | { | |
7e79cb86 DS |
985 | write_unlock(&dev_replace->lock); |
986 | } | |
987 | ||
73beece9 LB |
988 | /* inc blocking cnt and release read lock */ |
989 | void btrfs_dev_replace_set_lock_blocking( | |
990 | struct btrfs_dev_replace *dev_replace) | |
991 | { | |
992 | /* only set blocking for read lock */ | |
73beece9 LB |
993 | atomic_inc(&dev_replace->blocking_readers); |
994 | read_unlock(&dev_replace->lock); | |
e93c89c1 SB |
995 | } |
996 | ||
c404e0dc MX |
997 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) |
998 | { | |
7f8d236a | 999 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
c404e0dc MX |
1000 | } |
1001 | ||
4245215d | 1002 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
c404e0dc | 1003 | { |
7f8d236a DS |
1004 | percpu_counter_sub(&fs_info->dev_replace.bio_counter, amount); |
1005 | cond_wake_up_nomb(&fs_info->dev_replace.replace_wait); | |
c404e0dc MX |
1006 | } |
1007 | ||
1008 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
1009 | { | |
09dd7a01 | 1010 | while (1) { |
7f8d236a | 1011 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
09dd7a01 ZL |
1012 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1013 | &fs_info->fs_state))) | |
1014 | break; | |
1015 | ||
c404e0dc | 1016 | btrfs_bio_counter_dec(fs_info); |
7f8d236a | 1017 | wait_event(fs_info->dev_replace.replace_wait, |
c404e0dc MX |
1018 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1019 | &fs_info->fs_state)); | |
c404e0dc | 1020 | } |
c404e0dc | 1021 | } |