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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> | |
602cbe91 | 12 | #include "misc.h" |
e93c89c1 SB |
13 | #include "ctree.h" |
14 | #include "extent_map.h" | |
15 | #include "disk-io.h" | |
16 | #include "transaction.h" | |
17 | #include "print-tree.h" | |
18 | #include "volumes.h" | |
19 | #include "async-thread.h" | |
20 | #include "check-integrity.h" | |
21 | #include "rcu-string.h" | |
22 | #include "dev-replace.h" | |
49c6f736 | 23 | #include "sysfs.h" |
5b316468 | 24 | #include "zoned.h" |
e93c89c1 | 25 | |
30b3688e QW |
26 | /* |
27 | * Device replace overview | |
28 | * | |
29 | * [Objective] | |
30 | * To copy all extents (both new and on-disk) from source device to target | |
31 | * device, while still keeping the filesystem read-write. | |
32 | * | |
33 | * [Method] | |
34 | * There are two main methods involved: | |
35 | * | |
36 | * - Write duplication | |
37 | * | |
38 | * All new writes will be written to both target and source devices, so even | |
39 | * if replace gets canceled, sources device still contans up-to-date data. | |
40 | * | |
41 | * Location: handle_ops_on_dev_replace() from __btrfs_map_block() | |
42 | * Start: btrfs_dev_replace_start() | |
43 | * End: btrfs_dev_replace_finishing() | |
44 | * Content: Latest data/metadata | |
45 | * | |
46 | * - Copy existing extents | |
47 | * | |
48 | * This happens by re-using scrub facility, as scrub also iterates through | |
49 | * existing extents from commit root. | |
50 | * | |
51 | * Location: scrub_write_block_to_dev_replace() from | |
52 | * scrub_block_complete() | |
53 | * Content: Data/meta from commit root. | |
54 | * | |
55 | * Due to the content difference, we need to avoid nocow write when dev-replace | |
56 | * is happening. This is done by marking the block group read-only and waiting | |
57 | * for NOCOW writes. | |
58 | * | |
59 | * After replace is done, the finishing part is done by swapping the target and | |
60 | * source devices. | |
61 | * | |
62 | * Location: btrfs_dev_replace_update_device_in_mapping_tree() from | |
63 | * btrfs_dev_replace_finishing() | |
64 | */ | |
65 | ||
e93c89c1 SB |
66 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
67 | int scrub_ret); | |
e93c89c1 | 68 | static int btrfs_dev_replace_kthread(void *data); |
e93c89c1 SB |
69 | |
70 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
71 | { | |
72 | struct btrfs_key key; | |
73 | struct btrfs_root *dev_root = fs_info->dev_root; | |
74 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
75 | struct extent_buffer *eb; | |
76 | int slot; | |
77 | int ret = 0; | |
78 | struct btrfs_path *path = NULL; | |
79 | int item_size; | |
80 | struct btrfs_dev_replace_item *ptr; | |
81 | u64 src_devid; | |
82 | ||
83 | path = btrfs_alloc_path(); | |
84 | if (!path) { | |
85 | ret = -ENOMEM; | |
86 | goto out; | |
87 | } | |
88 | ||
89 | key.objectid = 0; | |
90 | key.type = BTRFS_DEV_REPLACE_KEY; | |
91 | key.offset = 0; | |
92 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
93 | if (ret) { | |
94 | no_valid_dev_replace_entry_found: | |
cf89af14 AJ |
95 | /* |
96 | * We don't have a replace item or it's corrupted. If there is | |
97 | * a replace target, fail the mount. | |
98 | */ | |
99 | if (btrfs_find_device(fs_info->fs_devices, | |
b2598edf | 100 | BTRFS_DEV_REPLACE_DEVID, NULL, NULL)) { |
cf89af14 AJ |
101 | btrfs_err(fs_info, |
102 | "found replace target device without a valid replace item"); | |
103 | ret = -EUCLEAN; | |
104 | goto out; | |
105 | } | |
e93c89c1 SB |
106 | ret = 0; |
107 | dev_replace->replace_state = | |
27e022a9 | 108 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; |
e93c89c1 SB |
109 | dev_replace->cont_reading_from_srcdev_mode = |
110 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
e93c89c1 SB |
111 | dev_replace->time_started = 0; |
112 | dev_replace->time_stopped = 0; | |
113 | atomic64_set(&dev_replace->num_write_errors, 0); | |
114 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
115 | dev_replace->cursor_left = 0; | |
116 | dev_replace->committed_cursor_left = 0; | |
117 | dev_replace->cursor_left_last_write_of_item = 0; | |
118 | dev_replace->cursor_right = 0; | |
119 | dev_replace->srcdev = NULL; | |
120 | dev_replace->tgtdev = NULL; | |
121 | dev_replace->is_valid = 0; | |
122 | dev_replace->item_needs_writeback = 0; | |
123 | goto out; | |
124 | } | |
125 | slot = path->slots[0]; | |
126 | eb = path->nodes[0]; | |
127 | item_size = btrfs_item_size_nr(eb, slot); | |
128 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); | |
129 | ||
130 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
efe120a0 FH |
131 | btrfs_warn(fs_info, |
132 | "dev_replace entry found has unexpected size, ignore entry"); | |
e93c89c1 SB |
133 | goto no_valid_dev_replace_entry_found; |
134 | } | |
135 | ||
136 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
137 | dev_replace->cont_reading_from_srcdev_mode = | |
138 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
139 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
140 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
141 | dev_replace->time_stopped = | |
142 | btrfs_dev_replace_time_stopped(eb, ptr); | |
143 | atomic64_set(&dev_replace->num_write_errors, | |
144 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
145 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
146 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
147 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
148 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
149 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
150 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
151 | dev_replace->is_valid = 1; | |
152 | ||
153 | dev_replace->item_needs_writeback = 0; | |
154 | switch (dev_replace->replace_state) { | |
155 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
156 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
157 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
cf89af14 AJ |
158 | /* |
159 | * We don't have an active replace item but if there is a | |
160 | * replace target, fail the mount. | |
161 | */ | |
162 | if (btrfs_find_device(fs_info->fs_devices, | |
b2598edf | 163 | BTRFS_DEV_REPLACE_DEVID, NULL, NULL)) { |
cf89af14 AJ |
164 | btrfs_err(fs_info, |
165 | "replace devid present without an active replace item"); | |
166 | ret = -EUCLEAN; | |
167 | } else { | |
168 | dev_replace->srcdev = NULL; | |
169 | dev_replace->tgtdev = NULL; | |
170 | } | |
e93c89c1 SB |
171 | break; |
172 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
173 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
e4319cd9 | 174 | dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices, |
b2598edf | 175 | src_devid, NULL, NULL); |
e4319cd9 | 176 | dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices, |
e93c89c1 | 177 | BTRFS_DEV_REPLACE_DEVID, |
b2598edf | 178 | NULL, NULL); |
e93c89c1 SB |
179 | /* |
180 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
181 | * missing | |
182 | */ | |
183 | if (!dev_replace->srcdev && | |
0b246afa | 184 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 185 | ret = -EIO; |
efe120a0 FH |
186 | btrfs_warn(fs_info, |
187 | "cannot mount because device replace operation is ongoing and"); | |
188 | btrfs_warn(fs_info, | |
189 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
190 | src_devid); | |
e93c89c1 SB |
191 | } |
192 | if (!dev_replace->tgtdev && | |
0b246afa | 193 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 194 | ret = -EIO; |
efe120a0 FH |
195 | btrfs_warn(fs_info, |
196 | "cannot mount because device replace operation is ongoing and"); | |
197 | btrfs_warn(fs_info, | |
198 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
6e71c47a | 199 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
200 | } |
201 | if (dev_replace->tgtdev) { | |
202 | if (dev_replace->srcdev) { | |
203 | dev_replace->tgtdev->total_bytes = | |
204 | dev_replace->srcdev->total_bytes; | |
205 | dev_replace->tgtdev->disk_total_bytes = | |
206 | dev_replace->srcdev->disk_total_bytes; | |
935e5cc9 MX |
207 | dev_replace->tgtdev->commit_total_bytes = |
208 | dev_replace->srcdev->commit_total_bytes; | |
e93c89c1 SB |
209 | dev_replace->tgtdev->bytes_used = |
210 | dev_replace->srcdev->bytes_used; | |
ce7213c7 MX |
211 | dev_replace->tgtdev->commit_bytes_used = |
212 | dev_replace->srcdev->commit_bytes_used; | |
e93c89c1 | 213 | } |
401e29c1 AJ |
214 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, |
215 | &dev_replace->tgtdev->dev_state); | |
15fc1283 AJ |
216 | |
217 | WARN_ON(fs_info->fs_devices->rw_devices == 0); | |
218 | dev_replace->tgtdev->io_width = fs_info->sectorsize; | |
219 | dev_replace->tgtdev->io_align = fs_info->sectorsize; | |
220 | dev_replace->tgtdev->sector_size = fs_info->sectorsize; | |
221 | dev_replace->tgtdev->fs_info = fs_info; | |
222 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, | |
223 | &dev_replace->tgtdev->dev_state); | |
e93c89c1 SB |
224 | } |
225 | break; | |
226 | } | |
227 | ||
228 | out: | |
527afb44 | 229 | btrfs_free_path(path); |
e93c89c1 SB |
230 | return ret; |
231 | } | |
232 | ||
d48f39d5 DS |
233 | /* |
234 | * Initialize a new device for device replace target from a given source dev | |
235 | * and path. | |
236 | * | |
237 | * Return 0 and new device in @device_out, otherwise return < 0 | |
238 | */ | |
239 | static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
240 | const char *device_path, | |
241 | struct btrfs_device *srcdev, | |
242 | struct btrfs_device **device_out) | |
243 | { | |
244 | struct btrfs_device *device; | |
245 | struct block_device *bdev; | |
d48f39d5 DS |
246 | struct rcu_string *name; |
247 | u64 devid = BTRFS_DEV_REPLACE_DEVID; | |
248 | int ret = 0; | |
249 | ||
250 | *device_out = NULL; | |
c6a5d954 | 251 | if (srcdev->fs_devices->seeding) { |
d48f39d5 DS |
252 | btrfs_err(fs_info, "the filesystem is a seed filesystem!"); |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, | |
257 | fs_info->bdev_holder); | |
258 | if (IS_ERR(bdev)) { | |
259 | btrfs_err(fs_info, "target device %s is invalid!", device_path); | |
260 | return PTR_ERR(bdev); | |
261 | } | |
262 | ||
b70f5097 NA |
263 | if (!btrfs_check_device_zone_type(fs_info, bdev)) { |
264 | btrfs_err(fs_info, | |
265 | "dev-replace: zoned type of target device mismatch with filesystem"); | |
266 | ret = -EINVAL; | |
267 | goto error; | |
268 | } | |
269 | ||
ddb93784 | 270 | sync_blockdev(bdev); |
d48f39d5 | 271 | |
1888709d | 272 | list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { |
d48f39d5 DS |
273 | if (device->bdev == bdev) { |
274 | btrfs_err(fs_info, | |
275 | "target device is in the filesystem!"); | |
276 | ret = -EEXIST; | |
277 | goto error; | |
278 | } | |
279 | } | |
280 | ||
281 | ||
282 | if (i_size_read(bdev->bd_inode) < | |
283 | btrfs_device_get_total_bytes(srcdev)) { | |
284 | btrfs_err(fs_info, | |
285 | "target device is smaller than source device!"); | |
286 | ret = -EINVAL; | |
287 | goto error; | |
288 | } | |
289 | ||
290 | ||
291 | device = btrfs_alloc_device(NULL, &devid, NULL); | |
292 | if (IS_ERR(device)) { | |
293 | ret = PTR_ERR(device); | |
294 | goto error; | |
295 | } | |
296 | ||
297 | name = rcu_string_strdup(device_path, GFP_KERNEL); | |
298 | if (!name) { | |
299 | btrfs_free_device(device); | |
300 | ret = -ENOMEM; | |
301 | goto error; | |
302 | } | |
303 | rcu_assign_pointer(device->name, name); | |
304 | ||
d48f39d5 DS |
305 | set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); |
306 | device->generation = 0; | |
307 | device->io_width = fs_info->sectorsize; | |
308 | device->io_align = fs_info->sectorsize; | |
309 | device->sector_size = fs_info->sectorsize; | |
310 | device->total_bytes = btrfs_device_get_total_bytes(srcdev); | |
311 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); | |
312 | device->bytes_used = btrfs_device_get_bytes_used(srcdev); | |
313 | device->commit_total_bytes = srcdev->commit_total_bytes; | |
314 | device->commit_bytes_used = device->bytes_used; | |
315 | device->fs_info = fs_info; | |
316 | device->bdev = bdev; | |
317 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); | |
318 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); | |
319 | device->mode = FMODE_EXCL; | |
320 | device->dev_stats_valid = 1; | |
321 | set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE); | |
322 | device->fs_devices = fs_info->fs_devices; | |
b0d9e1ea | 323 | |
5b316468 NA |
324 | ret = btrfs_get_dev_zone_info(device); |
325 | if (ret) | |
326 | goto error; | |
327 | ||
b0d9e1ea | 328 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
d48f39d5 DS |
329 | list_add(&device->dev_list, &fs_info->fs_devices->devices); |
330 | fs_info->fs_devices->num_devices++; | |
331 | fs_info->fs_devices->open_devices++; | |
332 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
333 | ||
334 | *device_out = device; | |
335 | return 0; | |
336 | ||
337 | error: | |
338 | blkdev_put(bdev, FMODE_EXCL); | |
339 | return ret; | |
340 | } | |
341 | ||
e93c89c1 SB |
342 | /* |
343 | * called from commit_transaction. Writes changed device replace state to | |
344 | * disk. | |
345 | */ | |
2b584c68 | 346 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans) |
e93c89c1 | 347 | { |
2b584c68 | 348 | struct btrfs_fs_info *fs_info = trans->fs_info; |
e93c89c1 SB |
349 | int ret; |
350 | struct btrfs_root *dev_root = fs_info->dev_root; | |
351 | struct btrfs_path *path; | |
352 | struct btrfs_key key; | |
353 | struct extent_buffer *eb; | |
354 | struct btrfs_dev_replace_item *ptr; | |
355 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
356 | ||
cb5583dd | 357 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
358 | if (!dev_replace->is_valid || |
359 | !dev_replace->item_needs_writeback) { | |
cb5583dd | 360 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
361 | return 0; |
362 | } | |
cb5583dd | 363 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
364 | |
365 | key.objectid = 0; | |
366 | key.type = BTRFS_DEV_REPLACE_KEY; | |
367 | key.offset = 0; | |
368 | ||
369 | path = btrfs_alloc_path(); | |
370 | if (!path) { | |
371 | ret = -ENOMEM; | |
372 | goto out; | |
373 | } | |
374 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
375 | if (ret < 0) { | |
5d163e0e JM |
376 | btrfs_warn(fs_info, |
377 | "error %d while searching for dev_replace item!", | |
378 | ret); | |
e93c89c1 SB |
379 | goto out; |
380 | } | |
381 | ||
382 | if (ret == 0 && | |
383 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
384 | /* | |
385 | * need to delete old one and insert a new one. | |
386 | * Since no attempt is made to recover any old state, if the | |
387 | * dev_replace state is 'running', the data on the target | |
388 | * drive is lost. | |
389 | * It would be possible to recover the state: just make sure | |
390 | * that the beginning of the item is never changed and always | |
391 | * contains all the essential information. Then read this | |
392 | * minimal set of information and use it as a base for the | |
393 | * new state. | |
394 | */ | |
395 | ret = btrfs_del_item(trans, dev_root, path); | |
396 | if (ret != 0) { | |
5d163e0e JM |
397 | btrfs_warn(fs_info, |
398 | "delete too small dev_replace item failed %d!", | |
399 | ret); | |
e93c89c1 SB |
400 | goto out; |
401 | } | |
402 | ret = 1; | |
403 | } | |
404 | ||
405 | if (ret == 1) { | |
406 | /* need to insert a new item */ | |
407 | btrfs_release_path(path); | |
408 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
409 | &key, sizeof(*ptr)); | |
410 | if (ret < 0) { | |
5d163e0e JM |
411 | btrfs_warn(fs_info, |
412 | "insert dev_replace item failed %d!", ret); | |
e93c89c1 SB |
413 | goto out; |
414 | } | |
415 | } | |
416 | ||
417 | eb = path->nodes[0]; | |
418 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
419 | struct btrfs_dev_replace_item); | |
420 | ||
cb5583dd | 421 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
422 | if (dev_replace->srcdev) |
423 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
424 | dev_replace->srcdev->devid); | |
425 | else | |
426 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
427 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
428 | dev_replace->cont_reading_from_srcdev_mode); | |
429 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
430 | dev_replace->replace_state); | |
431 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
432 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
433 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
434 | atomic64_read(&dev_replace->num_write_errors)); | |
435 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
436 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
437 | dev_replace->cursor_left_last_write_of_item = | |
438 | dev_replace->cursor_left; | |
439 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
440 | dev_replace->cursor_left_last_write_of_item); | |
441 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
442 | dev_replace->cursor_right); | |
443 | dev_replace->item_needs_writeback = 0; | |
cb5583dd | 444 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
445 | |
446 | btrfs_mark_buffer_dirty(eb); | |
447 | ||
448 | out: | |
449 | btrfs_free_path(path); | |
450 | ||
451 | return ret; | |
452 | } | |
453 | ||
3c958bd2 AJ |
454 | static char* btrfs_dev_name(struct btrfs_device *device) |
455 | { | |
acf18c56 | 456 | if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) |
3c958bd2 AJ |
457 | return "<missing disk>"; |
458 | else | |
459 | return rcu_str_deref(device->name); | |
460 | } | |
461 | ||
54862d6d | 462 | static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
da353f6b DS |
463 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, |
464 | int read_src) | |
e93c89c1 | 465 | { |
2ff7e61e | 466 | struct btrfs_root *root = fs_info->dev_root; |
e93c89c1 | 467 | struct btrfs_trans_handle *trans; |
e93c89c1 SB |
468 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
469 | int ret; | |
470 | struct btrfs_device *tgt_device = NULL; | |
471 | struct btrfs_device *src_device = NULL; | |
472 | ||
a27a94c2 NB |
473 | src_device = btrfs_find_device_by_devspec(fs_info, srcdevid, |
474 | srcdev_name); | |
475 | if (IS_ERR(src_device)) | |
476 | return PTR_ERR(src_device); | |
e93c89c1 | 477 | |
eede2bf3 OS |
478 | if (btrfs_pinned_by_swapfile(fs_info, src_device)) { |
479 | btrfs_warn_in_rcu(fs_info, | |
480 | "cannot replace device %s (devid %llu) due to active swapfile", | |
481 | btrfs_dev_name(src_device), src_device->devid); | |
482 | return -ETXTBSY; | |
483 | } | |
484 | ||
9e271ae2 AJ |
485 | /* |
486 | * Here we commit the transaction to make sure commit_total_bytes | |
487 | * of all the devices are updated. | |
488 | */ | |
489 | trans = btrfs_attach_transaction(root); | |
490 | if (!IS_ERR(trans)) { | |
3a45bb20 | 491 | ret = btrfs_commit_transaction(trans); |
9e271ae2 AJ |
492 | if (ret) |
493 | return ret; | |
494 | } else if (PTR_ERR(trans) != -ENOENT) { | |
495 | return PTR_ERR(trans); | |
496 | } | |
497 | ||
e1e0eb43 NB |
498 | ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name, |
499 | src_device, &tgt_device); | |
500 | if (ret) | |
501 | return ret; | |
502 | ||
cb5583dd | 503 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
504 | switch (dev_replace->replace_state) { |
505 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
506 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
507 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
508 | break; | |
509 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
510 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
5c061471 | 511 | ASSERT(0); |
b5255456 | 512 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
fa19452a | 513 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
514 | goto leave; |
515 | } | |
516 | ||
b5255456 | 517 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
e93c89c1 | 518 | dev_replace->srcdev = src_device; |
e93c89c1 SB |
519 | dev_replace->tgtdev = tgt_device; |
520 | ||
fc23c246 | 521 | btrfs_info_in_rcu(fs_info, |
ecaeb14b | 522 | "dev_replace from %s (devid %llu) to %s started", |
3c958bd2 | 523 | btrfs_dev_name(src_device), |
e93c89c1 SB |
524 | src_device->devid, |
525 | rcu_str_deref(tgt_device->name)); | |
526 | ||
e93c89c1 SB |
527 | /* |
528 | * from now on, the writes to the srcdev are all duplicated to | |
529 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
530 | */ | |
531 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
a944442c | 532 | dev_replace->time_started = ktime_get_real_seconds(); |
e93c89c1 SB |
533 | dev_replace->cursor_left = 0; |
534 | dev_replace->committed_cursor_left = 0; | |
535 | dev_replace->cursor_left_last_write_of_item = 0; | |
536 | dev_replace->cursor_right = 0; | |
537 | dev_replace->is_valid = 1; | |
538 | dev_replace->item_needs_writeback = 1; | |
7ccefb98 YK |
539 | atomic64_set(&dev_replace->num_write_errors, 0); |
540 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
cb5583dd | 541 | up_write(&dev_replace->rwsem); |
e93c89c1 | 542 | |
cd36da2e | 543 | ret = btrfs_sysfs_add_device(tgt_device); |
73416dab | 544 | if (ret) |
ab8d0fc4 | 545 | btrfs_err(fs_info, "kobj add dev failed %d", ret); |
73416dab | 546 | |
6374e57a | 547 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 | 548 | |
f232ab04 NB |
549 | /* Commit dev_replace state and reserve 1 item for it. */ |
550 | trans = btrfs_start_transaction(root, 1); | |
e93c89c1 SB |
551 | if (IS_ERR(trans)) { |
552 | ret = PTR_ERR(trans); | |
cb5583dd | 553 | down_write(&dev_replace->rwsem); |
5c061471 JM |
554 | dev_replace->replace_state = |
555 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; | |
556 | dev_replace->srcdev = NULL; | |
557 | dev_replace->tgtdev = NULL; | |
fa19452a | 558 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
559 | goto leave; |
560 | } | |
561 | ||
3a45bb20 | 562 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
563 | WARN_ON(ret); |
564 | ||
565 | /* the disk copy procedure reuses the scrub code */ | |
566 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 567 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
568 | &dev_replace->scrub_progress, 0, 1); |
569 | ||
fc23c246 | 570 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
4cea9037 | 571 | if (ret == -EINPROGRESS) |
b5255456 | 572 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
e93c89c1 | 573 | |
2fc9f6ba | 574 | return ret; |
e93c89c1 SB |
575 | |
576 | leave: | |
4f5ad7bd | 577 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
e93c89c1 SB |
578 | return ret; |
579 | } | |
580 | ||
2ff7e61e | 581 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
b5255456 AJ |
582 | struct btrfs_ioctl_dev_replace_args *args) |
583 | { | |
584 | int ret; | |
585 | ||
586 | switch (args->start.cont_reading_from_srcdev_mode) { | |
587 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
588 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
589 | break; | |
590 | default: | |
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
595 | args->start.tgtdev_name[0] == '\0') | |
596 | return -EINVAL; | |
597 | ||
2ff7e61e | 598 | ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name, |
b5255456 AJ |
599 | args->start.srcdevid, |
600 | args->start.srcdev_name, | |
601 | args->start.cont_reading_from_srcdev_mode); | |
602 | args->result = ret; | |
603 | /* don't warn if EINPROGRESS, someone else might be running scrub */ | |
53e62fb5 AJ |
604 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS || |
605 | ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) | |
606 | return 0; | |
b5255456 AJ |
607 | |
608 | return ret; | |
609 | } | |
610 | ||
c404e0dc | 611 | /* |
01327610 | 612 | * blocked until all in-flight bios operations are finished. |
c404e0dc MX |
613 | */ |
614 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
615 | { | |
c404e0dc | 616 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
7f8d236a DS |
617 | wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum( |
618 | &fs_info->dev_replace.bio_counter)); | |
c404e0dc MX |
619 | } |
620 | ||
621 | /* | |
622 | * we have removed target device, it is safe to allow new bios request. | |
623 | */ | |
624 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
625 | { | |
626 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
7f8d236a | 627 | wake_up(&fs_info->dev_replace.replace_wait); |
c404e0dc MX |
628 | } |
629 | ||
4c8f3532 FM |
630 | /* |
631 | * When finishing the device replace, before swapping the source device with the | |
632 | * target device we must update the chunk allocation state in the target device, | |
633 | * as it is empty because replace works by directly copying the chunks and not | |
634 | * through the normal chunk allocation path. | |
635 | */ | |
636 | static int btrfs_set_target_alloc_state(struct btrfs_device *srcdev, | |
637 | struct btrfs_device *tgtdev) | |
638 | { | |
639 | struct extent_state *cached_state = NULL; | |
640 | u64 start = 0; | |
641 | u64 found_start; | |
642 | u64 found_end; | |
643 | int ret = 0; | |
644 | ||
645 | lockdep_assert_held(&srcdev->fs_info->chunk_mutex); | |
646 | ||
647 | while (!find_first_extent_bit(&srcdev->alloc_state, start, | |
648 | &found_start, &found_end, | |
649 | CHUNK_ALLOCATED, &cached_state)) { | |
650 | ret = set_extent_bits(&tgtdev->alloc_state, found_start, | |
651 | found_end, CHUNK_ALLOCATED); | |
652 | if (ret) | |
653 | break; | |
654 | start = found_end + 1; | |
655 | } | |
656 | ||
657 | free_extent_state(cached_state); | |
658 | return ret; | |
659 | } | |
660 | ||
0725c0c9 AJ |
661 | static void btrfs_dev_replace_update_device_in_mapping_tree( |
662 | struct btrfs_fs_info *fs_info, | |
663 | struct btrfs_device *srcdev, | |
664 | struct btrfs_device *tgtdev) | |
665 | { | |
666 | struct extent_map_tree *em_tree = &fs_info->mapping_tree; | |
667 | struct extent_map *em; | |
668 | struct map_lookup *map; | |
669 | u64 start = 0; | |
670 | int i; | |
671 | ||
672 | write_lock(&em_tree->lock); | |
673 | do { | |
674 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
675 | if (!em) | |
676 | break; | |
677 | map = em->map_lookup; | |
678 | for (i = 0; i < map->num_stripes; i++) | |
679 | if (srcdev == map->stripes[i].dev) | |
680 | map->stripes[i].dev = tgtdev; | |
681 | start = em->start + em->len; | |
682 | free_extent_map(em); | |
683 | } while (start); | |
684 | write_unlock(&em_tree->lock); | |
685 | } | |
686 | ||
e93c89c1 SB |
687 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
688 | int scrub_ret) | |
689 | { | |
690 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
691 | struct btrfs_device *tgt_device; | |
692 | struct btrfs_device *src_device; | |
693 | struct btrfs_root *root = fs_info->tree_root; | |
694 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
695 | struct btrfs_trans_handle *trans; | |
696 | int ret = 0; | |
697 | ||
698 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
699 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
700 | ||
cb5583dd | 701 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
702 | /* was the operation canceled, or is it finished? */ |
703 | if (dev_replace->replace_state != | |
704 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
cb5583dd | 705 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
706 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
707 | return 0; | |
708 | } | |
709 | ||
710 | tgt_device = dev_replace->tgtdev; | |
711 | src_device = dev_replace->srcdev; | |
cb5583dd | 712 | up_read(&dev_replace->rwsem); |
e93c89c1 | 713 | |
e93c89c1 SB |
714 | /* |
715 | * flush all outstanding I/O and inode extent mappings before the | |
716 | * copy operation is declared as being finished | |
717 | */ | |
3d45f221 | 718 | ret = btrfs_start_delalloc_roots(fs_info, U64_MAX, false); |
3edb2a68 MX |
719 | if (ret) { |
720 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
721 | return ret; | |
722 | } | |
6374e57a | 723 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 | 724 | |
66d204a1 FM |
725 | if (!scrub_ret) |
726 | btrfs_reada_remove_dev(src_device); | |
727 | ||
debd1c06 NB |
728 | /* |
729 | * We have to use this loop approach because at this point src_device | |
730 | * has to be available for transaction commit to complete, yet new | |
731 | * chunks shouldn't be allocated on the device. | |
732 | */ | |
733 | while (1) { | |
734 | trans = btrfs_start_transaction(root, 0); | |
735 | if (IS_ERR(trans)) { | |
66d204a1 | 736 | btrfs_reada_undo_remove_dev(src_device); |
debd1c06 NB |
737 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
738 | return PTR_ERR(trans); | |
739 | } | |
740 | ret = btrfs_commit_transaction(trans); | |
741 | WARN_ON(ret); | |
742 | ||
743 | /* Prevent write_all_supers() during the finishing procedure */ | |
744 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
745 | /* Prevent new chunks being allocated on the source device */ | |
746 | mutex_lock(&fs_info->chunk_mutex); | |
747 | ||
748 | if (!list_empty(&src_device->post_commit_list)) { | |
749 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
750 | mutex_unlock(&fs_info->chunk_mutex); | |
751 | } else { | |
752 | break; | |
753 | } | |
e93c89c1 | 754 | } |
e93c89c1 | 755 | |
cb5583dd | 756 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
757 | dev_replace->replace_state = |
758 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
759 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
760 | dev_replace->tgtdev = NULL; | |
761 | dev_replace->srcdev = NULL; | |
a944442c | 762 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 SB |
763 | dev_replace->item_needs_writeback = 1; |
764 | ||
4c8f3532 FM |
765 | /* |
766 | * Update allocation state in the new device and replace the old device | |
767 | * with the new one in the mapping tree. | |
768 | */ | |
c404e0dc | 769 | if (!scrub_ret) { |
4c8f3532 FM |
770 | scrub_ret = btrfs_set_target_alloc_state(src_device, tgt_device); |
771 | if (scrub_ret) | |
772 | goto error; | |
c404e0dc MX |
773 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
774 | src_device, | |
775 | tgt_device); | |
776 | } else { | |
f9085abf AJ |
777 | if (scrub_ret != -ECANCELED) |
778 | btrfs_err_in_rcu(fs_info, | |
0b246afa | 779 | "btrfs_scrub_dev(%s, %llu, %s) failed %d", |
3c958bd2 | 780 | btrfs_dev_name(src_device), |
0b246afa JM |
781 | src_device->devid, |
782 | rcu_str_deref(tgt_device->name), scrub_ret); | |
4c8f3532 | 783 | error: |
cb5583dd | 784 | up_write(&dev_replace->rwsem); |
0b246afa JM |
785 | mutex_unlock(&fs_info->chunk_mutex); |
786 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
66d204a1 | 787 | btrfs_reada_undo_remove_dev(src_device); |
ae6529c3 | 788 | btrfs_rm_dev_replace_blocked(fs_info); |
e93c89c1 | 789 | if (tgt_device) |
4f5ad7bd | 790 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
ae6529c3 | 791 | btrfs_rm_dev_replace_unblocked(fs_info); |
e93c89c1 SB |
792 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
793 | ||
2fc9f6ba | 794 | return scrub_ret; |
e93c89c1 SB |
795 | } |
796 | ||
0b246afa JM |
797 | btrfs_info_in_rcu(fs_info, |
798 | "dev_replace from %s (devid %llu) to %s finished", | |
3c958bd2 | 799 | btrfs_dev_name(src_device), |
0b246afa JM |
800 | src_device->devid, |
801 | rcu_str_deref(tgt_device->name)); | |
401e29c1 | 802 | clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &tgt_device->dev_state); |
e93c89c1 SB |
803 | tgt_device->devid = src_device->devid; |
804 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
805 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
806 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
807 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
808 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
809 | btrfs_device_set_disk_total_bytes(tgt_device, | |
810 | src_device->disk_total_bytes); | |
811 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
ce7213c7 | 812 | tgt_device->commit_bytes_used = src_device->bytes_used; |
88acff64 | 813 | |
d6507cf1 | 814 | btrfs_assign_next_active_device(src_device, tgt_device); |
88acff64 | 815 | |
e93c89c1 | 816 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); |
82372bc8 | 817 | fs_info->fs_devices->rw_devices++; |
e93c89c1 | 818 | |
cb5583dd | 819 | up_write(&dev_replace->rwsem); |
c404e0dc MX |
820 | btrfs_rm_dev_replace_blocked(fs_info); |
821 | ||
68a9db5f | 822 | btrfs_rm_dev_replace_remove_srcdev(src_device); |
1357272f | 823 | |
c404e0dc MX |
824 | btrfs_rm_dev_replace_unblocked(fs_info); |
825 | ||
1e7e1f9e MT |
826 | /* |
827 | * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will | |
828 | * update on-disk dev stats value during commit transaction | |
829 | */ | |
830 | atomic_inc(&tgt_device->dev_stats_ccnt); | |
831 | ||
e93c89c1 SB |
832 | /* |
833 | * this is again a consistent state where no dev_replace procedure | |
834 | * is running, the target device is part of the filesystem, the | |
835 | * source device is not part of the filesystem anymore and its 1st | |
836 | * superblock is scratched out so that it is no longer marked to | |
837 | * belong to this filesystem. | |
838 | */ | |
0b246afa JM |
839 | mutex_unlock(&fs_info->chunk_mutex); |
840 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
e93c89c1 | 841 | |
084b6e7c | 842 | /* replace the sysfs entry */ |
53f8a74c | 843 | btrfs_sysfs_remove_device(src_device); |
668e48af | 844 | btrfs_sysfs_update_devid(tgt_device); |
313b0858 JB |
845 | if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state)) |
846 | btrfs_scratch_superblocks(fs_info, src_device->bdev, | |
847 | src_device->name->str); | |
084b6e7c | 848 | |
e93c89c1 SB |
849 | /* write back the superblocks */ |
850 | trans = btrfs_start_transaction(root, 0); | |
851 | if (!IS_ERR(trans)) | |
3a45bb20 | 852 | btrfs_commit_transaction(trans); |
e93c89c1 SB |
853 | |
854 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
855 | ||
a466c85e JB |
856 | btrfs_rm_dev_replace_free_srcdev(src_device); |
857 | ||
e93c89c1 SB |
858 | return 0; |
859 | } | |
860 | ||
74b595fe DS |
861 | /* |
862 | * Read progress of device replace status according to the state and last | |
863 | * stored position. The value format is the same as for | |
864 | * btrfs_dev_replace::progress_1000 | |
865 | */ | |
866 | static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info) | |
867 | { | |
868 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
869 | u64 ret = 0; | |
870 | ||
871 | switch (dev_replace->replace_state) { | |
872 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
873 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
874 | ret = 0; | |
875 | break; | |
876 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
877 | ret = 1000; | |
878 | break; | |
879 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
880 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
881 | ret = div64_u64(dev_replace->cursor_left, | |
882 | div_u64(btrfs_device_get_total_bytes( | |
883 | dev_replace->srcdev), 1000)); | |
884 | break; | |
885 | } | |
886 | ||
887 | return ret; | |
888 | } | |
889 | ||
e93c89c1 SB |
890 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
891 | struct btrfs_ioctl_dev_replace_args *args) | |
892 | { | |
893 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
894 | ||
cb5583dd | 895 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
896 | /* even if !dev_replace_is_valid, the values are good enough for |
897 | * the replace_status ioctl */ | |
898 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
899 | args->status.replace_state = dev_replace->replace_state; | |
900 | args->status.time_started = dev_replace->time_started; | |
901 | args->status.time_stopped = dev_replace->time_stopped; | |
902 | args->status.num_write_errors = | |
903 | atomic64_read(&dev_replace->num_write_errors); | |
904 | args->status.num_uncorrectable_read_errors = | |
905 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
74b595fe | 906 | args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); |
cb5583dd | 907 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
908 | } |
909 | ||
18e67c73 | 910 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
e93c89c1 SB |
911 | { |
912 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
913 | struct btrfs_device *tgt_device = NULL; | |
8f2ceaa7 | 914 | struct btrfs_device *src_device = NULL; |
e93c89c1 SB |
915 | struct btrfs_trans_handle *trans; |
916 | struct btrfs_root *root = fs_info->tree_root; | |
18e67c73 | 917 | int result; |
e93c89c1 SB |
918 | int ret; |
919 | ||
bc98a42c | 920 | if (sb_rdonly(fs_info->sb)) |
e649e587 ID |
921 | return -EROFS; |
922 | ||
e93c89c1 | 923 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
cb5583dd | 924 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
925 | switch (dev_replace->replace_state) { |
926 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
927 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
928 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
929 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
cb5583dd | 930 | up_write(&dev_replace->rwsem); |
d189dd70 | 931 | break; |
e93c89c1 | 932 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
d189dd70 AJ |
933 | tgt_device = dev_replace->tgtdev; |
934 | src_device = dev_replace->srcdev; | |
cb5583dd | 935 | up_write(&dev_replace->rwsem); |
b47dda2e AJ |
936 | ret = btrfs_scrub_cancel(fs_info); |
937 | if (ret < 0) { | |
938 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
939 | } else { | |
940 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
941 | /* | |
942 | * btrfs_dev_replace_finishing() will handle the | |
943 | * cleanup part | |
944 | */ | |
945 | btrfs_info_in_rcu(fs_info, | |
946 | "dev_replace from %s (devid %llu) to %s canceled", | |
947 | btrfs_dev_name(src_device), src_device->devid, | |
948 | btrfs_dev_name(tgt_device)); | |
949 | } | |
d189dd70 | 950 | break; |
e93c89c1 | 951 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
d189dd70 AJ |
952 | /* |
953 | * Scrub doing the replace isn't running so we need to do the | |
954 | * cleanup step of btrfs_dev_replace_finishing() here | |
955 | */ | |
e93c89c1 SB |
956 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
957 | tgt_device = dev_replace->tgtdev; | |
8f2ceaa7 | 958 | src_device = dev_replace->srcdev; |
e93c89c1 SB |
959 | dev_replace->tgtdev = NULL; |
960 | dev_replace->srcdev = NULL; | |
d189dd70 AJ |
961 | dev_replace->replace_state = |
962 | BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
963 | dev_replace->time_stopped = ktime_get_real_seconds(); | |
964 | dev_replace->item_needs_writeback = 1; | |
e93c89c1 | 965 | |
cb5583dd | 966 | up_write(&dev_replace->rwsem); |
8f2ceaa7 | 967 | |
fe97e2e1 AJ |
968 | /* Scrub for replace must not be running in suspended state */ |
969 | ret = btrfs_scrub_cancel(fs_info); | |
970 | ASSERT(ret != -ENOTCONN); | |
d189dd70 AJ |
971 | |
972 | trans = btrfs_start_transaction(root, 0); | |
973 | if (IS_ERR(trans)) { | |
974 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
975 | return PTR_ERR(trans); | |
976 | } | |
977 | ret = btrfs_commit_transaction(trans); | |
978 | WARN_ON(ret); | |
8f2ceaa7 | 979 | |
d189dd70 AJ |
980 | btrfs_info_in_rcu(fs_info, |
981 | "suspended dev_replace from %s (devid %llu) to %s canceled", | |
982 | btrfs_dev_name(src_device), src_device->devid, | |
983 | btrfs_dev_name(tgt_device)); | |
984 | ||
985 | if (tgt_device) | |
986 | btrfs_destroy_dev_replace_tgtdev(tgt_device); | |
987 | break; | |
988 | default: | |
669e859b | 989 | up_write(&dev_replace->rwsem); |
d189dd70 AJ |
990 | result = -EINVAL; |
991 | } | |
e93c89c1 | 992 | |
e93c89c1 SB |
993 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
994 | return result; | |
995 | } | |
996 | ||
997 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
998 | { | |
999 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1000 | ||
1001 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
cb5583dd DS |
1002 | down_write(&dev_replace->rwsem); |
1003 | ||
e93c89c1 SB |
1004 | switch (dev_replace->replace_state) { |
1005 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1006 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1007 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1008 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1009 | break; | |
1010 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1011 | dev_replace->replace_state = | |
1012 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
a944442c | 1013 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 | 1014 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 1015 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
1016 | break; |
1017 | } | |
1018 | ||
cb5583dd | 1019 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1020 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
1021 | } | |
1022 | ||
1023 | /* resume dev_replace procedure that was interrupted by unmount */ | |
1024 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
1025 | { | |
1026 | struct task_struct *task; | |
1027 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1028 | ||
cb5583dd DS |
1029 | down_write(&dev_replace->rwsem); |
1030 | ||
e93c89c1 SB |
1031 | switch (dev_replace->replace_state) { |
1032 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1033 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1034 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
cb5583dd | 1035 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1036 | return 0; |
1037 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1038 | break; | |
1039 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1040 | dev_replace->replace_state = | |
1041 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
1042 | break; | |
1043 | } | |
1044 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 | 1045 | btrfs_info(fs_info, |
5d163e0e JM |
1046 | "cannot continue dev_replace, tgtdev is missing"); |
1047 | btrfs_info(fs_info, | |
1048 | "you may cancel the operation after 'mount -o degraded'"); | |
0d228ece AJ |
1049 | dev_replace->replace_state = |
1050 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 1051 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1052 | return 0; |
1053 | } | |
cb5583dd | 1054 | up_write(&dev_replace->rwsem); |
e93c89c1 | 1055 | |
010a47bd DS |
1056 | /* |
1057 | * This could collide with a paused balance, but the exclusive op logic | |
1058 | * should never allow both to start and pause. We don't want to allow | |
1059 | * dev-replace to start anyway. | |
1060 | */ | |
c3e1f96c | 1061 | if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { |
cb5583dd | 1062 | down_write(&dev_replace->rwsem); |
05c49e6b AJ |
1063 | dev_replace->replace_state = |
1064 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 1065 | up_write(&dev_replace->rwsem); |
010a47bd DS |
1066 | btrfs_info(fs_info, |
1067 | "cannot resume dev-replace, other exclusive operation running"); | |
1068 | return 0; | |
1069 | } | |
1070 | ||
e93c89c1 | 1071 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
8c6ffba0 | 1072 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
1073 | } |
1074 | ||
1075 | static int btrfs_dev_replace_kthread(void *data) | |
1076 | { | |
1077 | struct btrfs_fs_info *fs_info = data; | |
1078 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
e93c89c1 | 1079 | u64 progress; |
00251a52 | 1080 | int ret; |
e93c89c1 | 1081 | |
f1b8a1e8 DS |
1082 | progress = btrfs_dev_replace_progress(fs_info); |
1083 | progress = div_u64(progress, 10); | |
1084 | btrfs_info_in_rcu(fs_info, | |
3c958bd2 AJ |
1085 | "continuing dev_replace from %s (devid %llu) to target %s @%u%%", |
1086 | btrfs_dev_name(dev_replace->srcdev), | |
f1b8a1e8 | 1087 | dev_replace->srcdev->devid, |
3c958bd2 | 1088 | btrfs_dev_name(dev_replace->tgtdev), |
f1b8a1e8 DS |
1089 | (unsigned int)progress); |
1090 | ||
e93c89c1 SB |
1091 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
1092 | dev_replace->committed_cursor_left, | |
7cc8e58d | 1093 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
1094 | &dev_replace->scrub_progress, 0, 1); |
1095 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
49365e69 | 1096 | WARN_ON(ret && ret != -ECANCELED); |
00251a52 | 1097 | |
c3e1f96c | 1098 | btrfs_exclop_finish(fs_info); |
e93c89c1 SB |
1099 | return 0; |
1100 | } | |
1101 | ||
e1f60a65 | 1102 | int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
e93c89c1 SB |
1103 | { |
1104 | if (!dev_replace->is_valid) | |
1105 | return 0; | |
1106 | ||
1107 | switch (dev_replace->replace_state) { | |
1108 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1109 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1110 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1111 | return 0; | |
1112 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1113 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1114 | /* | |
1115 | * return true even if tgtdev is missing (this is | |
1116 | * something that can happen if the dev_replace | |
1117 | * procedure is suspended by an umount and then | |
1118 | * the tgtdev is missing (or "btrfs dev scan") was | |
52042d8e | 1119 | * not called and the filesystem is remounted |
e93c89c1 SB |
1120 | * in degraded state. This does not stop the |
1121 | * dev_replace procedure. It needs to be canceled | |
bb7ab3b9 | 1122 | * manually if the cancellation is wanted. |
e93c89c1 SB |
1123 | */ |
1124 | break; | |
1125 | } | |
1126 | return 1; | |
1127 | } | |
1128 | ||
c404e0dc MX |
1129 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) |
1130 | { | |
7f8d236a | 1131 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
c404e0dc MX |
1132 | } |
1133 | ||
4245215d | 1134 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
c404e0dc | 1135 | { |
7f8d236a DS |
1136 | percpu_counter_sub(&fs_info->dev_replace.bio_counter, amount); |
1137 | cond_wake_up_nomb(&fs_info->dev_replace.replace_wait); | |
c404e0dc MX |
1138 | } |
1139 | ||
1140 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
1141 | { | |
09dd7a01 | 1142 | while (1) { |
7f8d236a | 1143 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
09dd7a01 ZL |
1144 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1145 | &fs_info->fs_state))) | |
1146 | break; | |
1147 | ||
c404e0dc | 1148 | btrfs_bio_counter_dec(fs_info); |
7f8d236a | 1149 | wait_event(fs_info->dev_replace.replace_wait, |
c404e0dc MX |
1150 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1151 | &fs_info->fs_state)); | |
c404e0dc | 1152 | } |
c404e0dc | 1153 | } |