Commit | Line | Data |
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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" | |
e93c89c1 | 21 | #include "dev-replace.h" |
49c6f736 | 22 | #include "sysfs.h" |
5b316468 | 23 | #include "zoned.h" |
78ce9fc2 | 24 | #include "block-group.h" |
ec8eb376 | 25 | #include "fs.h" |
07e81dc9 | 26 | #include "accessors.h" |
2fc6822c | 27 | #include "scrub.h" |
e93c89c1 | 28 | |
30b3688e QW |
29 | /* |
30 | * Device replace overview | |
31 | * | |
32 | * [Objective] | |
33 | * To copy all extents (both new and on-disk) from source device to target | |
34 | * device, while still keeping the filesystem read-write. | |
35 | * | |
36 | * [Method] | |
37 | * There are two main methods involved: | |
38 | * | |
39 | * - Write duplication | |
40 | * | |
41 | * All new writes will be written to both target and source devices, so even | |
1a9fd417 | 42 | * if replace gets canceled, sources device still contains up-to-date data. |
30b3688e | 43 | * |
cd4efd21 | 44 | * Location: handle_ops_on_dev_replace() from btrfs_map_block() |
30b3688e QW |
45 | * Start: btrfs_dev_replace_start() |
46 | * End: btrfs_dev_replace_finishing() | |
47 | * Content: Latest data/metadata | |
48 | * | |
49 | * - Copy existing extents | |
50 | * | |
51 | * This happens by re-using scrub facility, as scrub also iterates through | |
52 | * existing extents from commit root. | |
53 | * | |
54 | * Location: scrub_write_block_to_dev_replace() from | |
55 | * scrub_block_complete() | |
56 | * Content: Data/meta from commit root. | |
57 | * | |
58 | * Due to the content difference, we need to avoid nocow write when dev-replace | |
59 | * is happening. This is done by marking the block group read-only and waiting | |
60 | * for NOCOW writes. | |
61 | * | |
62 | * After replace is done, the finishing part is done by swapping the target and | |
63 | * source devices. | |
64 | * | |
65 | * Location: btrfs_dev_replace_update_device_in_mapping_tree() from | |
66 | * btrfs_dev_replace_finishing() | |
67 | */ | |
68 | ||
e93c89c1 SB |
69 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
70 | int scrub_ret); | |
e93c89c1 | 71 | static int btrfs_dev_replace_kthread(void *data); |
e93c89c1 SB |
72 | |
73 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
74 | { | |
562d7b15 | 75 | struct btrfs_dev_lookup_args args = { .devid = BTRFS_DEV_REPLACE_DEVID }; |
e93c89c1 SB |
76 | struct btrfs_key key; |
77 | struct btrfs_root *dev_root = fs_info->dev_root; | |
78 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
79 | struct extent_buffer *eb; | |
80 | int slot; | |
81 | int ret = 0; | |
82 | struct btrfs_path *path = NULL; | |
83 | int item_size; | |
84 | struct btrfs_dev_replace_item *ptr; | |
85 | u64 src_devid; | |
86 | ||
3cb89497 JB |
87 | if (!dev_root) |
88 | return 0; | |
89 | ||
e93c89c1 SB |
90 | path = btrfs_alloc_path(); |
91 | if (!path) { | |
92 | ret = -ENOMEM; | |
93 | goto out; | |
94 | } | |
95 | ||
96 | key.objectid = 0; | |
97 | key.type = BTRFS_DEV_REPLACE_KEY; | |
98 | key.offset = 0; | |
99 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
100 | if (ret) { | |
101 | no_valid_dev_replace_entry_found: | |
cf89af14 AJ |
102 | /* |
103 | * We don't have a replace item or it's corrupted. If there is | |
104 | * a replace target, fail the mount. | |
105 | */ | |
562d7b15 | 106 | if (btrfs_find_device(fs_info->fs_devices, &args)) { |
cf89af14 AJ |
107 | btrfs_err(fs_info, |
108 | "found replace target device without a valid replace item"); | |
109 | ret = -EUCLEAN; | |
110 | goto out; | |
111 | } | |
e93c89c1 SB |
112 | ret = 0; |
113 | dev_replace->replace_state = | |
27e022a9 | 114 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; |
e93c89c1 SB |
115 | dev_replace->cont_reading_from_srcdev_mode = |
116 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
e93c89c1 SB |
117 | dev_replace->time_started = 0; |
118 | dev_replace->time_stopped = 0; | |
119 | atomic64_set(&dev_replace->num_write_errors, 0); | |
120 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
121 | dev_replace->cursor_left = 0; | |
122 | dev_replace->committed_cursor_left = 0; | |
123 | dev_replace->cursor_left_last_write_of_item = 0; | |
124 | dev_replace->cursor_right = 0; | |
125 | dev_replace->srcdev = NULL; | |
126 | dev_replace->tgtdev = NULL; | |
127 | dev_replace->is_valid = 0; | |
128 | dev_replace->item_needs_writeback = 0; | |
129 | goto out; | |
130 | } | |
131 | slot = path->slots[0]; | |
132 | eb = path->nodes[0]; | |
3212fa14 | 133 | item_size = btrfs_item_size(eb, slot); |
e93c89c1 SB |
134 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); |
135 | ||
136 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
efe120a0 FH |
137 | btrfs_warn(fs_info, |
138 | "dev_replace entry found has unexpected size, ignore entry"); | |
e93c89c1 SB |
139 | goto no_valid_dev_replace_entry_found; |
140 | } | |
141 | ||
142 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
143 | dev_replace->cont_reading_from_srcdev_mode = | |
144 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
145 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
146 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
147 | dev_replace->time_stopped = | |
148 | btrfs_dev_replace_time_stopped(eb, ptr); | |
149 | atomic64_set(&dev_replace->num_write_errors, | |
150 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
151 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
152 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
153 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
154 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
155 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
156 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
157 | dev_replace->is_valid = 1; | |
158 | ||
159 | dev_replace->item_needs_writeback = 0; | |
160 | switch (dev_replace->replace_state) { | |
161 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
162 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
163 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
cf89af14 AJ |
164 | /* |
165 | * We don't have an active replace item but if there is a | |
166 | * replace target, fail the mount. | |
167 | */ | |
562d7b15 | 168 | if (btrfs_find_device(fs_info->fs_devices, &args)) { |
cf89af14 | 169 | btrfs_err(fs_info, |
f2c3bec2 | 170 | "replace without active item, run 'device scan --forget' on the target device"); |
cf89af14 AJ |
171 | ret = -EUCLEAN; |
172 | } else { | |
173 | dev_replace->srcdev = NULL; | |
174 | dev_replace->tgtdev = NULL; | |
175 | } | |
e93c89c1 SB |
176 | break; |
177 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
178 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
562d7b15 JB |
179 | dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices, &args); |
180 | args.devid = src_devid; | |
181 | dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices, &args); | |
182 | ||
e93c89c1 SB |
183 | /* |
184 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
185 | * missing | |
186 | */ | |
187 | if (!dev_replace->srcdev && | |
0b246afa | 188 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 189 | ret = -EIO; |
efe120a0 FH |
190 | btrfs_warn(fs_info, |
191 | "cannot mount because device replace operation is ongoing and"); | |
192 | btrfs_warn(fs_info, | |
193 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
194 | src_devid); | |
e93c89c1 SB |
195 | } |
196 | if (!dev_replace->tgtdev && | |
0b246afa | 197 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 198 | ret = -EIO; |
efe120a0 FH |
199 | btrfs_warn(fs_info, |
200 | "cannot mount because device replace operation is ongoing and"); | |
201 | btrfs_warn(fs_info, | |
202 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
6e71c47a | 203 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
204 | } |
205 | if (dev_replace->tgtdev) { | |
206 | if (dev_replace->srcdev) { | |
207 | dev_replace->tgtdev->total_bytes = | |
208 | dev_replace->srcdev->total_bytes; | |
209 | dev_replace->tgtdev->disk_total_bytes = | |
210 | dev_replace->srcdev->disk_total_bytes; | |
935e5cc9 MX |
211 | dev_replace->tgtdev->commit_total_bytes = |
212 | dev_replace->srcdev->commit_total_bytes; | |
e93c89c1 SB |
213 | dev_replace->tgtdev->bytes_used = |
214 | dev_replace->srcdev->bytes_used; | |
ce7213c7 MX |
215 | dev_replace->tgtdev->commit_bytes_used = |
216 | dev_replace->srcdev->commit_bytes_used; | |
e93c89c1 | 217 | } |
401e29c1 AJ |
218 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, |
219 | &dev_replace->tgtdev->dev_state); | |
15fc1283 AJ |
220 | |
221 | WARN_ON(fs_info->fs_devices->rw_devices == 0); | |
222 | dev_replace->tgtdev->io_width = fs_info->sectorsize; | |
223 | dev_replace->tgtdev->io_align = fs_info->sectorsize; | |
224 | dev_replace->tgtdev->sector_size = fs_info->sectorsize; | |
225 | dev_replace->tgtdev->fs_info = fs_info; | |
226 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, | |
227 | &dev_replace->tgtdev->dev_state); | |
e93c89c1 SB |
228 | } |
229 | break; | |
230 | } | |
231 | ||
232 | out: | |
527afb44 | 233 | btrfs_free_path(path); |
e93c89c1 SB |
234 | return ret; |
235 | } | |
236 | ||
d48f39d5 DS |
237 | /* |
238 | * Initialize a new device for device replace target from a given source dev | |
239 | * and path. | |
240 | * | |
241 | * Return 0 and new device in @device_out, otherwise return < 0 | |
242 | */ | |
243 | static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
244 | const char *device_path, | |
245 | struct btrfs_device *srcdev, | |
246 | struct btrfs_device **device_out) | |
247 | { | |
bef16b52 | 248 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
d48f39d5 DS |
249 | struct btrfs_device *device; |
250 | struct block_device *bdev; | |
d48f39d5 DS |
251 | u64 devid = BTRFS_DEV_REPLACE_DEVID; |
252 | int ret = 0; | |
253 | ||
254 | *device_out = NULL; | |
c6a5d954 | 255 | if (srcdev->fs_devices->seeding) { |
d48f39d5 DS |
256 | btrfs_err(fs_info, "the filesystem is a seed filesystem!"); |
257 | return -EINVAL; | |
258 | } | |
259 | ||
260 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, | |
261 | fs_info->bdev_holder); | |
262 | if (IS_ERR(bdev)) { | |
263 | btrfs_err(fs_info, "target device %s is invalid!", device_path); | |
264 | return PTR_ERR(bdev); | |
265 | } | |
266 | ||
b70f5097 NA |
267 | if (!btrfs_check_device_zone_type(fs_info, bdev)) { |
268 | btrfs_err(fs_info, | |
269 | "dev-replace: zoned type of target device mismatch with filesystem"); | |
270 | ret = -EINVAL; | |
271 | goto error; | |
272 | } | |
273 | ||
ddb93784 | 274 | sync_blockdev(bdev); |
d48f39d5 | 275 | |
bef16b52 | 276 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
d48f39d5 DS |
277 | if (device->bdev == bdev) { |
278 | btrfs_err(fs_info, | |
279 | "target device is in the filesystem!"); | |
280 | ret = -EEXIST; | |
281 | goto error; | |
282 | } | |
283 | } | |
284 | ||
285 | ||
cda00eba | 286 | if (bdev_nr_bytes(bdev) < btrfs_device_get_total_bytes(srcdev)) { |
d48f39d5 DS |
287 | btrfs_err(fs_info, |
288 | "target device is smaller than source device!"); | |
289 | ret = -EINVAL; | |
290 | goto error; | |
291 | } | |
292 | ||
293 | ||
bb21e302 | 294 | device = btrfs_alloc_device(NULL, &devid, NULL, device_path); |
d48f39d5 DS |
295 | if (IS_ERR(device)) { |
296 | ret = PTR_ERR(device); | |
297 | goto error; | |
298 | } | |
299 | ||
4889bc05 AJ |
300 | ret = lookup_bdev(device_path, &device->devt); |
301 | if (ret) | |
302 | goto error; | |
d48f39d5 | 303 | |
d48f39d5 DS |
304 | set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); |
305 | device->generation = 0; | |
306 | device->io_width = fs_info->sectorsize; | |
307 | device->io_align = fs_info->sectorsize; | |
308 | device->sector_size = fs_info->sectorsize; | |
309 | device->total_bytes = btrfs_device_get_total_bytes(srcdev); | |
310 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); | |
311 | device->bytes_used = btrfs_device_get_bytes_used(srcdev); | |
312 | device->commit_total_bytes = srcdev->commit_total_bytes; | |
313 | device->commit_bytes_used = device->bytes_used; | |
314 | device->fs_info = fs_info; | |
315 | device->bdev = bdev; | |
316 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); | |
317 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); | |
318 | device->mode = FMODE_EXCL; | |
319 | device->dev_stats_valid = 1; | |
320 | set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE); | |
bef16b52 | 321 | device->fs_devices = fs_devices; |
b0d9e1ea | 322 | |
16beac87 | 323 | ret = btrfs_get_dev_zone_info(device, false); |
5b316468 NA |
324 | if (ret) |
325 | goto error; | |
326 | ||
bef16b52 AJ |
327 | mutex_lock(&fs_devices->device_list_mutex); |
328 | list_add(&device->dev_list, &fs_devices->devices); | |
329 | fs_devices->num_devices++; | |
330 | fs_devices->open_devices++; | |
331 | mutex_unlock(&fs_devices->device_list_mutex); | |
d48f39d5 DS |
332 | |
333 | *device_out = device; | |
334 | return 0; | |
335 | ||
336 | error: | |
337 | blkdev_put(bdev, FMODE_EXCL); | |
338 | return ret; | |
339 | } | |
340 | ||
e93c89c1 SB |
341 | /* |
342 | * called from commit_transaction. Writes changed device replace state to | |
343 | * disk. | |
344 | */ | |
2b584c68 | 345 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans) |
e93c89c1 | 346 | { |
2b584c68 | 347 | struct btrfs_fs_info *fs_info = trans->fs_info; |
e93c89c1 SB |
348 | int ret; |
349 | struct btrfs_root *dev_root = fs_info->dev_root; | |
350 | struct btrfs_path *path; | |
351 | struct btrfs_key key; | |
352 | struct extent_buffer *eb; | |
353 | struct btrfs_dev_replace_item *ptr; | |
354 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
355 | ||
cb5583dd | 356 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
357 | if (!dev_replace->is_valid || |
358 | !dev_replace->item_needs_writeback) { | |
cb5583dd | 359 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
360 | return 0; |
361 | } | |
cb5583dd | 362 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
363 | |
364 | key.objectid = 0; | |
365 | key.type = BTRFS_DEV_REPLACE_KEY; | |
366 | key.offset = 0; | |
367 | ||
368 | path = btrfs_alloc_path(); | |
369 | if (!path) { | |
370 | ret = -ENOMEM; | |
371 | goto out; | |
372 | } | |
373 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
374 | if (ret < 0) { | |
5d163e0e JM |
375 | btrfs_warn(fs_info, |
376 | "error %d while searching for dev_replace item!", | |
377 | ret); | |
e93c89c1 SB |
378 | goto out; |
379 | } | |
380 | ||
381 | if (ret == 0 && | |
3212fa14 | 382 | btrfs_item_size(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { |
e93c89c1 SB |
383 | /* |
384 | * need to delete old one and insert a new one. | |
385 | * Since no attempt is made to recover any old state, if the | |
386 | * dev_replace state is 'running', the data on the target | |
387 | * drive is lost. | |
388 | * It would be possible to recover the state: just make sure | |
389 | * that the beginning of the item is never changed and always | |
390 | * contains all the essential information. Then read this | |
391 | * minimal set of information and use it as a base for the | |
392 | * new state. | |
393 | */ | |
394 | ret = btrfs_del_item(trans, dev_root, path); | |
395 | if (ret != 0) { | |
5d163e0e JM |
396 | btrfs_warn(fs_info, |
397 | "delete too small dev_replace item failed %d!", | |
398 | ret); | |
e93c89c1 SB |
399 | goto out; |
400 | } | |
401 | ret = 1; | |
402 | } | |
403 | ||
404 | if (ret == 1) { | |
405 | /* need to insert a new item */ | |
406 | btrfs_release_path(path); | |
407 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
408 | &key, sizeof(*ptr)); | |
409 | if (ret < 0) { | |
5d163e0e JM |
410 | btrfs_warn(fs_info, |
411 | "insert dev_replace item failed %d!", ret); | |
e93c89c1 SB |
412 | goto out; |
413 | } | |
414 | } | |
415 | ||
416 | eb = path->nodes[0]; | |
417 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
418 | struct btrfs_dev_replace_item); | |
419 | ||
cb5583dd | 420 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
421 | if (dev_replace->srcdev) |
422 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
423 | dev_replace->srcdev->devid); | |
424 | else | |
425 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
426 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
427 | dev_replace->cont_reading_from_srcdev_mode); | |
428 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
429 | dev_replace->replace_state); | |
430 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
431 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
432 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
433 | atomic64_read(&dev_replace->num_write_errors)); | |
434 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
435 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
436 | dev_replace->cursor_left_last_write_of_item = | |
437 | dev_replace->cursor_left; | |
438 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
439 | dev_replace->cursor_left_last_write_of_item); | |
440 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
441 | dev_replace->cursor_right); | |
442 | dev_replace->item_needs_writeback = 0; | |
cb5583dd | 443 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
444 | |
445 | btrfs_mark_buffer_dirty(eb); | |
446 | ||
447 | out: | |
448 | btrfs_free_path(path); | |
449 | ||
450 | return ret; | |
451 | } | |
452 | ||
78ce9fc2 NA |
453 | static int mark_block_group_to_copy(struct btrfs_fs_info *fs_info, |
454 | struct btrfs_device *src_dev) | |
455 | { | |
456 | struct btrfs_path *path; | |
457 | struct btrfs_key key; | |
458 | struct btrfs_key found_key; | |
459 | struct btrfs_root *root = fs_info->dev_root; | |
460 | struct btrfs_dev_extent *dev_extent = NULL; | |
461 | struct btrfs_block_group *cache; | |
462 | struct btrfs_trans_handle *trans; | |
9bc5fc04 | 463 | int iter_ret = 0; |
78ce9fc2 NA |
464 | int ret = 0; |
465 | u64 chunk_offset; | |
466 | ||
467 | /* Do not use "to_copy" on non zoned filesystem for now */ | |
468 | if (!btrfs_is_zoned(fs_info)) | |
469 | return 0; | |
470 | ||
471 | mutex_lock(&fs_info->chunk_mutex); | |
472 | ||
473 | /* Ensure we don't have pending new block group */ | |
474 | spin_lock(&fs_info->trans_lock); | |
475 | while (fs_info->running_transaction && | |
476 | !list_empty(&fs_info->running_transaction->dev_update_list)) { | |
477 | spin_unlock(&fs_info->trans_lock); | |
478 | mutex_unlock(&fs_info->chunk_mutex); | |
479 | trans = btrfs_attach_transaction(root); | |
480 | if (IS_ERR(trans)) { | |
481 | ret = PTR_ERR(trans); | |
482 | mutex_lock(&fs_info->chunk_mutex); | |
483 | if (ret == -ENOENT) { | |
484 | spin_lock(&fs_info->trans_lock); | |
485 | continue; | |
486 | } else { | |
487 | goto unlock; | |
488 | } | |
489 | } | |
490 | ||
491 | ret = btrfs_commit_transaction(trans); | |
492 | mutex_lock(&fs_info->chunk_mutex); | |
493 | if (ret) | |
494 | goto unlock; | |
495 | ||
496 | spin_lock(&fs_info->trans_lock); | |
497 | } | |
498 | spin_unlock(&fs_info->trans_lock); | |
499 | ||
500 | path = btrfs_alloc_path(); | |
501 | if (!path) { | |
502 | ret = -ENOMEM; | |
503 | goto unlock; | |
504 | } | |
505 | ||
506 | path->reada = READA_FORWARD; | |
507 | path->search_commit_root = 1; | |
508 | path->skip_locking = 1; | |
509 | ||
510 | key.objectid = src_dev->devid; | |
511 | key.type = BTRFS_DEV_EXTENT_KEY; | |
512 | key.offset = 0; | |
513 | ||
9bc5fc04 | 514 | btrfs_for_each_slot(root, &key, &found_key, path, iter_ret) { |
78ce9fc2 | 515 | struct extent_buffer *leaf = path->nodes[0]; |
78ce9fc2 NA |
516 | |
517 | if (found_key.objectid != src_dev->devid) | |
518 | break; | |
519 | ||
520 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) | |
521 | break; | |
522 | ||
523 | if (found_key.offset < key.offset) | |
524 | break; | |
525 | ||
9bc5fc04 | 526 | dev_extent = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent); |
78ce9fc2 NA |
527 | |
528 | chunk_offset = btrfs_dev_extent_chunk_offset(leaf, dev_extent); | |
529 | ||
530 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
531 | if (!cache) | |
9bc5fc04 | 532 | continue; |
78ce9fc2 | 533 | |
3349b57f | 534 | set_bit(BLOCK_GROUP_FLAG_TO_COPY, &cache->runtime_flags); |
78ce9fc2 | 535 | btrfs_put_block_group(cache); |
78ce9fc2 | 536 | } |
9bc5fc04 GN |
537 | if (iter_ret < 0) |
538 | ret = iter_ret; | |
78ce9fc2 | 539 | |
78ce9fc2 NA |
540 | btrfs_free_path(path); |
541 | unlock: | |
542 | mutex_unlock(&fs_info->chunk_mutex); | |
543 | ||
544 | return ret; | |
545 | } | |
546 | ||
547 | bool btrfs_finish_block_group_to_copy(struct btrfs_device *srcdev, | |
548 | struct btrfs_block_group *cache, | |
549 | u64 physical) | |
550 | { | |
551 | struct btrfs_fs_info *fs_info = cache->fs_info; | |
552 | struct extent_map *em; | |
553 | struct map_lookup *map; | |
554 | u64 chunk_offset = cache->start; | |
555 | int num_extents, cur_extent; | |
556 | int i; | |
557 | ||
558 | /* Do not use "to_copy" on non zoned filesystem for now */ | |
559 | if (!btrfs_is_zoned(fs_info)) | |
560 | return true; | |
561 | ||
562 | spin_lock(&cache->lock); | |
3349b57f | 563 | if (test_bit(BLOCK_GROUP_FLAG_REMOVED, &cache->runtime_flags)) { |
78ce9fc2 NA |
564 | spin_unlock(&cache->lock); |
565 | return true; | |
566 | } | |
567 | spin_unlock(&cache->lock); | |
568 | ||
569 | em = btrfs_get_chunk_map(fs_info, chunk_offset, 1); | |
570 | ASSERT(!IS_ERR(em)); | |
571 | map = em->map_lookup; | |
572 | ||
c1867eb3 DS |
573 | num_extents = 0; |
574 | cur_extent = 0; | |
78ce9fc2 NA |
575 | for (i = 0; i < map->num_stripes; i++) { |
576 | /* We have more device extent to copy */ | |
577 | if (srcdev != map->stripes[i].dev) | |
578 | continue; | |
579 | ||
580 | num_extents++; | |
581 | if (physical == map->stripes[i].physical) | |
582 | cur_extent = i; | |
583 | } | |
584 | ||
585 | free_extent_map(em); | |
586 | ||
587 | if (num_extents > 1 && cur_extent < num_extents - 1) { | |
588 | /* | |
589 | * Has more stripes on this device. Keep this block group | |
590 | * readonly until we finish all the stripes. | |
591 | */ | |
592 | return false; | |
593 | } | |
594 | ||
595 | /* Last stripe on this device */ | |
3349b57f | 596 | clear_bit(BLOCK_GROUP_FLAG_TO_COPY, &cache->runtime_flags); |
78ce9fc2 NA |
597 | |
598 | return true; | |
599 | } | |
600 | ||
54862d6d | 601 | static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
da353f6b DS |
602 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, |
603 | int read_src) | |
e93c89c1 | 604 | { |
2ff7e61e | 605 | struct btrfs_root *root = fs_info->dev_root; |
e93c89c1 | 606 | struct btrfs_trans_handle *trans; |
e93c89c1 SB |
607 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
608 | int ret; | |
609 | struct btrfs_device *tgt_device = NULL; | |
610 | struct btrfs_device *src_device = NULL; | |
611 | ||
a27a94c2 NB |
612 | src_device = btrfs_find_device_by_devspec(fs_info, srcdevid, |
613 | srcdev_name); | |
614 | if (IS_ERR(src_device)) | |
615 | return PTR_ERR(src_device); | |
e93c89c1 | 616 | |
eede2bf3 OS |
617 | if (btrfs_pinned_by_swapfile(fs_info, src_device)) { |
618 | btrfs_warn_in_rcu(fs_info, | |
619 | "cannot replace device %s (devid %llu) due to active swapfile", | |
620 | btrfs_dev_name(src_device), src_device->devid); | |
621 | return -ETXTBSY; | |
622 | } | |
623 | ||
9e271ae2 AJ |
624 | /* |
625 | * Here we commit the transaction to make sure commit_total_bytes | |
626 | * of all the devices are updated. | |
627 | */ | |
628 | trans = btrfs_attach_transaction(root); | |
629 | if (!IS_ERR(trans)) { | |
3a45bb20 | 630 | ret = btrfs_commit_transaction(trans); |
9e271ae2 AJ |
631 | if (ret) |
632 | return ret; | |
633 | } else if (PTR_ERR(trans) != -ENOENT) { | |
634 | return PTR_ERR(trans); | |
635 | } | |
636 | ||
e1e0eb43 NB |
637 | ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name, |
638 | src_device, &tgt_device); | |
639 | if (ret) | |
640 | return ret; | |
641 | ||
78ce9fc2 NA |
642 | ret = mark_block_group_to_copy(fs_info, src_device); |
643 | if (ret) | |
644 | return ret; | |
645 | ||
cb5583dd | 646 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
647 | switch (dev_replace->replace_state) { |
648 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
649 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
650 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
651 | break; | |
652 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
653 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
5c061471 | 654 | ASSERT(0); |
b5255456 | 655 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
fa19452a | 656 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
657 | goto leave; |
658 | } | |
659 | ||
b5255456 | 660 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
e93c89c1 | 661 | dev_replace->srcdev = src_device; |
e93c89c1 SB |
662 | dev_replace->tgtdev = tgt_device; |
663 | ||
fc23c246 | 664 | btrfs_info_in_rcu(fs_info, |
ecaeb14b | 665 | "dev_replace from %s (devid %llu) to %s started", |
3c958bd2 | 666 | btrfs_dev_name(src_device), |
e93c89c1 | 667 | src_device->devid, |
cb3e217b | 668 | btrfs_dev_name(tgt_device)); |
e93c89c1 | 669 | |
e93c89c1 SB |
670 | /* |
671 | * from now on, the writes to the srcdev are all duplicated to | |
672 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
673 | */ | |
674 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
a944442c | 675 | dev_replace->time_started = ktime_get_real_seconds(); |
e93c89c1 SB |
676 | dev_replace->cursor_left = 0; |
677 | dev_replace->committed_cursor_left = 0; | |
678 | dev_replace->cursor_left_last_write_of_item = 0; | |
679 | dev_replace->cursor_right = 0; | |
680 | dev_replace->is_valid = 1; | |
681 | dev_replace->item_needs_writeback = 1; | |
7ccefb98 YK |
682 | atomic64_set(&dev_replace->num_write_errors, 0); |
683 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
cb5583dd | 684 | up_write(&dev_replace->rwsem); |
e93c89c1 | 685 | |
cd36da2e | 686 | ret = btrfs_sysfs_add_device(tgt_device); |
73416dab | 687 | if (ret) |
ab8d0fc4 | 688 | btrfs_err(fs_info, "kobj add dev failed %d", ret); |
73416dab | 689 | |
6374e57a | 690 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 | 691 | |
a692e13d FM |
692 | /* |
693 | * Commit dev_replace state and reserve 1 item for it. | |
694 | * This is crucial to ensure we won't miss copying extents for new block | |
695 | * groups that are allocated after we started the device replace, and | |
696 | * must be done after setting up the device replace state. | |
697 | */ | |
f232ab04 | 698 | trans = btrfs_start_transaction(root, 1); |
e93c89c1 SB |
699 | if (IS_ERR(trans)) { |
700 | ret = PTR_ERR(trans); | |
cb5583dd | 701 | down_write(&dev_replace->rwsem); |
5c061471 JM |
702 | dev_replace->replace_state = |
703 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; | |
704 | dev_replace->srcdev = NULL; | |
705 | dev_replace->tgtdev = NULL; | |
fa19452a | 706 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
707 | goto leave; |
708 | } | |
709 | ||
3a45bb20 | 710 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
711 | WARN_ON(ret); |
712 | ||
713 | /* the disk copy procedure reuses the scrub code */ | |
714 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 715 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
716 | &dev_replace->scrub_progress, 0, 1); |
717 | ||
fc23c246 | 718 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
4cea9037 | 719 | if (ret == -EINPROGRESS) |
b5255456 | 720 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
e93c89c1 | 721 | |
2fc9f6ba | 722 | return ret; |
e93c89c1 SB |
723 | |
724 | leave: | |
4f5ad7bd | 725 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
e93c89c1 SB |
726 | return ret; |
727 | } | |
728 | ||
2ff7e61e | 729 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
b5255456 AJ |
730 | struct btrfs_ioctl_dev_replace_args *args) |
731 | { | |
732 | int ret; | |
733 | ||
734 | switch (args->start.cont_reading_from_srcdev_mode) { | |
735 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
736 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
737 | break; | |
738 | default: | |
739 | return -EINVAL; | |
740 | } | |
741 | ||
742 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
743 | args->start.tgtdev_name[0] == '\0') | |
744 | return -EINVAL; | |
745 | ||
2ff7e61e | 746 | ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name, |
b5255456 AJ |
747 | args->start.srcdevid, |
748 | args->start.srcdev_name, | |
749 | args->start.cont_reading_from_srcdev_mode); | |
750 | args->result = ret; | |
751 | /* don't warn if EINPROGRESS, someone else might be running scrub */ | |
53e62fb5 AJ |
752 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS || |
753 | ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) | |
754 | return 0; | |
b5255456 AJ |
755 | |
756 | return ret; | |
757 | } | |
758 | ||
c404e0dc | 759 | /* |
01327610 | 760 | * blocked until all in-flight bios operations are finished. |
c404e0dc MX |
761 | */ |
762 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
763 | { | |
c404e0dc | 764 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
7f8d236a DS |
765 | wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum( |
766 | &fs_info->dev_replace.bio_counter)); | |
c404e0dc MX |
767 | } |
768 | ||
769 | /* | |
770 | * we have removed target device, it is safe to allow new bios request. | |
771 | */ | |
772 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
773 | { | |
774 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
7f8d236a | 775 | wake_up(&fs_info->dev_replace.replace_wait); |
c404e0dc MX |
776 | } |
777 | ||
4c8f3532 FM |
778 | /* |
779 | * When finishing the device replace, before swapping the source device with the | |
780 | * target device we must update the chunk allocation state in the target device, | |
781 | * as it is empty because replace works by directly copying the chunks and not | |
782 | * through the normal chunk allocation path. | |
783 | */ | |
784 | static int btrfs_set_target_alloc_state(struct btrfs_device *srcdev, | |
785 | struct btrfs_device *tgtdev) | |
786 | { | |
787 | struct extent_state *cached_state = NULL; | |
788 | u64 start = 0; | |
789 | u64 found_start; | |
790 | u64 found_end; | |
791 | int ret = 0; | |
792 | ||
793 | lockdep_assert_held(&srcdev->fs_info->chunk_mutex); | |
794 | ||
795 | while (!find_first_extent_bit(&srcdev->alloc_state, start, | |
796 | &found_start, &found_end, | |
797 | CHUNK_ALLOCATED, &cached_state)) { | |
0acd32c2 | 798 | ret = set_extent_bit(&tgtdev->alloc_state, found_start, |
1d126800 | 799 | found_end, CHUNK_ALLOCATED, NULL); |
4c8f3532 FM |
800 | if (ret) |
801 | break; | |
802 | start = found_end + 1; | |
803 | } | |
804 | ||
805 | free_extent_state(cached_state); | |
806 | return ret; | |
807 | } | |
808 | ||
0725c0c9 AJ |
809 | static void btrfs_dev_replace_update_device_in_mapping_tree( |
810 | struct btrfs_fs_info *fs_info, | |
811 | struct btrfs_device *srcdev, | |
812 | struct btrfs_device *tgtdev) | |
813 | { | |
814 | struct extent_map_tree *em_tree = &fs_info->mapping_tree; | |
815 | struct extent_map *em; | |
816 | struct map_lookup *map; | |
817 | u64 start = 0; | |
818 | int i; | |
819 | ||
820 | write_lock(&em_tree->lock); | |
821 | do { | |
822 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
823 | if (!em) | |
824 | break; | |
825 | map = em->map_lookup; | |
826 | for (i = 0; i < map->num_stripes; i++) | |
827 | if (srcdev == map->stripes[i].dev) | |
828 | map->stripes[i].dev = tgtdev; | |
829 | start = em->start + em->len; | |
830 | free_extent_map(em); | |
831 | } while (start); | |
832 | write_unlock(&em_tree->lock); | |
833 | } | |
834 | ||
e93c89c1 SB |
835 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
836 | int scrub_ret) | |
837 | { | |
838 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
b67d73c1 | 839 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
e93c89c1 SB |
840 | struct btrfs_device *tgt_device; |
841 | struct btrfs_device *src_device; | |
842 | struct btrfs_root *root = fs_info->tree_root; | |
843 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
844 | struct btrfs_trans_handle *trans; | |
845 | int ret = 0; | |
846 | ||
847 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
848 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
849 | ||
cb5583dd | 850 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
851 | /* was the operation canceled, or is it finished? */ |
852 | if (dev_replace->replace_state != | |
853 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
cb5583dd | 854 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
855 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
856 | return 0; | |
857 | } | |
858 | ||
859 | tgt_device = dev_replace->tgtdev; | |
860 | src_device = dev_replace->srcdev; | |
cb5583dd | 861 | up_read(&dev_replace->rwsem); |
e93c89c1 | 862 | |
e93c89c1 SB |
863 | /* |
864 | * flush all outstanding I/O and inode extent mappings before the | |
865 | * copy operation is declared as being finished | |
866 | */ | |
9db4dc24 | 867 | ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); |
3edb2a68 MX |
868 | if (ret) { |
869 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
870 | return ret; | |
871 | } | |
6374e57a | 872 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 | 873 | |
debd1c06 NB |
874 | /* |
875 | * We have to use this loop approach because at this point src_device | |
876 | * has to be available for transaction commit to complete, yet new | |
877 | * chunks shouldn't be allocated on the device. | |
878 | */ | |
879 | while (1) { | |
880 | trans = btrfs_start_transaction(root, 0); | |
881 | if (IS_ERR(trans)) { | |
882 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
883 | return PTR_ERR(trans); | |
884 | } | |
885 | ret = btrfs_commit_transaction(trans); | |
886 | WARN_ON(ret); | |
887 | ||
888 | /* Prevent write_all_supers() during the finishing procedure */ | |
b67d73c1 | 889 | mutex_lock(&fs_devices->device_list_mutex); |
debd1c06 NB |
890 | /* Prevent new chunks being allocated on the source device */ |
891 | mutex_lock(&fs_info->chunk_mutex); | |
892 | ||
893 | if (!list_empty(&src_device->post_commit_list)) { | |
b67d73c1 | 894 | mutex_unlock(&fs_devices->device_list_mutex); |
debd1c06 NB |
895 | mutex_unlock(&fs_info->chunk_mutex); |
896 | } else { | |
897 | break; | |
898 | } | |
e93c89c1 | 899 | } |
e93c89c1 | 900 | |
cb5583dd | 901 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
902 | dev_replace->replace_state = |
903 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
904 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
905 | dev_replace->tgtdev = NULL; | |
906 | dev_replace->srcdev = NULL; | |
a944442c | 907 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 SB |
908 | dev_replace->item_needs_writeback = 1; |
909 | ||
4c8f3532 FM |
910 | /* |
911 | * Update allocation state in the new device and replace the old device | |
912 | * with the new one in the mapping tree. | |
913 | */ | |
c404e0dc | 914 | if (!scrub_ret) { |
4c8f3532 FM |
915 | scrub_ret = btrfs_set_target_alloc_state(src_device, tgt_device); |
916 | if (scrub_ret) | |
917 | goto error; | |
c404e0dc MX |
918 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
919 | src_device, | |
920 | tgt_device); | |
921 | } else { | |
f9085abf AJ |
922 | if (scrub_ret != -ECANCELED) |
923 | btrfs_err_in_rcu(fs_info, | |
0b246afa | 924 | "btrfs_scrub_dev(%s, %llu, %s) failed %d", |
3c958bd2 | 925 | btrfs_dev_name(src_device), |
0b246afa | 926 | src_device->devid, |
cb3e217b | 927 | btrfs_dev_name(tgt_device), scrub_ret); |
4c8f3532 | 928 | error: |
cb5583dd | 929 | up_write(&dev_replace->rwsem); |
0b246afa | 930 | mutex_unlock(&fs_info->chunk_mutex); |
b67d73c1 | 931 | mutex_unlock(&fs_devices->device_list_mutex); |
ae6529c3 | 932 | btrfs_rm_dev_replace_blocked(fs_info); |
e93c89c1 | 933 | if (tgt_device) |
4f5ad7bd | 934 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
ae6529c3 | 935 | btrfs_rm_dev_replace_unblocked(fs_info); |
e93c89c1 SB |
936 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
937 | ||
2fc9f6ba | 938 | return scrub_ret; |
e93c89c1 SB |
939 | } |
940 | ||
0b246afa JM |
941 | btrfs_info_in_rcu(fs_info, |
942 | "dev_replace from %s (devid %llu) to %s finished", | |
3c958bd2 | 943 | btrfs_dev_name(src_device), |
0b246afa | 944 | src_device->devid, |
cb3e217b | 945 | btrfs_dev_name(tgt_device)); |
401e29c1 | 946 | clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &tgt_device->dev_state); |
e93c89c1 SB |
947 | tgt_device->devid = src_device->devid; |
948 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
949 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
950 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
951 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
952 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
953 | btrfs_device_set_disk_total_bytes(tgt_device, | |
954 | src_device->disk_total_bytes); | |
955 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
ce7213c7 | 956 | tgt_device->commit_bytes_used = src_device->bytes_used; |
88acff64 | 957 | |
d6507cf1 | 958 | btrfs_assign_next_active_device(src_device, tgt_device); |
88acff64 | 959 | |
b67d73c1 AJ |
960 | list_add(&tgt_device->dev_alloc_list, &fs_devices->alloc_list); |
961 | fs_devices->rw_devices++; | |
e93c89c1 | 962 | |
cb5583dd | 963 | up_write(&dev_replace->rwsem); |
c404e0dc MX |
964 | btrfs_rm_dev_replace_blocked(fs_info); |
965 | ||
68a9db5f | 966 | btrfs_rm_dev_replace_remove_srcdev(src_device); |
1357272f | 967 | |
c404e0dc MX |
968 | btrfs_rm_dev_replace_unblocked(fs_info); |
969 | ||
1e7e1f9e MT |
970 | /* |
971 | * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will | |
972 | * update on-disk dev stats value during commit transaction | |
973 | */ | |
974 | atomic_inc(&tgt_device->dev_stats_ccnt); | |
975 | ||
e93c89c1 SB |
976 | /* |
977 | * this is again a consistent state where no dev_replace procedure | |
978 | * is running, the target device is part of the filesystem, the | |
979 | * source device is not part of the filesystem anymore and its 1st | |
980 | * superblock is scratched out so that it is no longer marked to | |
981 | * belong to this filesystem. | |
982 | */ | |
0b246afa | 983 | mutex_unlock(&fs_info->chunk_mutex); |
b67d73c1 | 984 | mutex_unlock(&fs_devices->device_list_mutex); |
e93c89c1 | 985 | |
084b6e7c | 986 | /* replace the sysfs entry */ |
53f8a74c | 987 | btrfs_sysfs_remove_device(src_device); |
668e48af | 988 | btrfs_sysfs_update_devid(tgt_device); |
313b0858 JB |
989 | if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state)) |
990 | btrfs_scratch_superblocks(fs_info, src_device->bdev, | |
991 | src_device->name->str); | |
084b6e7c | 992 | |
e93c89c1 SB |
993 | /* write back the superblocks */ |
994 | trans = btrfs_start_transaction(root, 0); | |
995 | if (!IS_ERR(trans)) | |
3a45bb20 | 996 | btrfs_commit_transaction(trans); |
e93c89c1 SB |
997 | |
998 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
999 | ||
a466c85e JB |
1000 | btrfs_rm_dev_replace_free_srcdev(src_device); |
1001 | ||
e93c89c1 SB |
1002 | return 0; |
1003 | } | |
1004 | ||
74b595fe DS |
1005 | /* |
1006 | * Read progress of device replace status according to the state and last | |
1007 | * stored position. The value format is the same as for | |
1008 | * btrfs_dev_replace::progress_1000 | |
1009 | */ | |
1010 | static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info) | |
1011 | { | |
1012 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1013 | u64 ret = 0; | |
1014 | ||
1015 | switch (dev_replace->replace_state) { | |
1016 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1017 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1018 | ret = 0; | |
1019 | break; | |
1020 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1021 | ret = 1000; | |
1022 | break; | |
1023 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1024 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1025 | ret = div64_u64(dev_replace->cursor_left, | |
1026 | div_u64(btrfs_device_get_total_bytes( | |
1027 | dev_replace->srcdev), 1000)); | |
1028 | break; | |
1029 | } | |
1030 | ||
1031 | return ret; | |
1032 | } | |
1033 | ||
e93c89c1 SB |
1034 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
1035 | struct btrfs_ioctl_dev_replace_args *args) | |
1036 | { | |
1037 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1038 | ||
cb5583dd | 1039 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
1040 | /* even if !dev_replace_is_valid, the values are good enough for |
1041 | * the replace_status ioctl */ | |
1042 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
1043 | args->status.replace_state = dev_replace->replace_state; | |
1044 | args->status.time_started = dev_replace->time_started; | |
1045 | args->status.time_stopped = dev_replace->time_stopped; | |
1046 | args->status.num_write_errors = | |
1047 | atomic64_read(&dev_replace->num_write_errors); | |
1048 | args->status.num_uncorrectable_read_errors = | |
1049 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
74b595fe | 1050 | args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); |
cb5583dd | 1051 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
1052 | } |
1053 | ||
18e67c73 | 1054 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
e93c89c1 SB |
1055 | { |
1056 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1057 | struct btrfs_device *tgt_device = NULL; | |
8f2ceaa7 | 1058 | struct btrfs_device *src_device = NULL; |
e93c89c1 SB |
1059 | struct btrfs_trans_handle *trans; |
1060 | struct btrfs_root *root = fs_info->tree_root; | |
18e67c73 | 1061 | int result; |
e93c89c1 SB |
1062 | int ret; |
1063 | ||
bc98a42c | 1064 | if (sb_rdonly(fs_info->sb)) |
e649e587 ID |
1065 | return -EROFS; |
1066 | ||
e93c89c1 | 1067 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
cb5583dd | 1068 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
1069 | switch (dev_replace->replace_state) { |
1070 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1071 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1072 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1073 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
cb5583dd | 1074 | up_write(&dev_replace->rwsem); |
d189dd70 | 1075 | break; |
e93c89c1 | 1076 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
d189dd70 AJ |
1077 | tgt_device = dev_replace->tgtdev; |
1078 | src_device = dev_replace->srcdev; | |
cb5583dd | 1079 | up_write(&dev_replace->rwsem); |
b47dda2e AJ |
1080 | ret = btrfs_scrub_cancel(fs_info); |
1081 | if (ret < 0) { | |
1082 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
1083 | } else { | |
1084 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
1085 | /* | |
1086 | * btrfs_dev_replace_finishing() will handle the | |
1087 | * cleanup part | |
1088 | */ | |
1089 | btrfs_info_in_rcu(fs_info, | |
1090 | "dev_replace from %s (devid %llu) to %s canceled", | |
1091 | btrfs_dev_name(src_device), src_device->devid, | |
1092 | btrfs_dev_name(tgt_device)); | |
1093 | } | |
d189dd70 | 1094 | break; |
e93c89c1 | 1095 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
d189dd70 AJ |
1096 | /* |
1097 | * Scrub doing the replace isn't running so we need to do the | |
1098 | * cleanup step of btrfs_dev_replace_finishing() here | |
1099 | */ | |
e93c89c1 SB |
1100 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
1101 | tgt_device = dev_replace->tgtdev; | |
8f2ceaa7 | 1102 | src_device = dev_replace->srcdev; |
e93c89c1 SB |
1103 | dev_replace->tgtdev = NULL; |
1104 | dev_replace->srcdev = NULL; | |
d189dd70 AJ |
1105 | dev_replace->replace_state = |
1106 | BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
1107 | dev_replace->time_stopped = ktime_get_real_seconds(); | |
1108 | dev_replace->item_needs_writeback = 1; | |
e93c89c1 | 1109 | |
cb5583dd | 1110 | up_write(&dev_replace->rwsem); |
8f2ceaa7 | 1111 | |
fe97e2e1 | 1112 | /* Scrub for replace must not be running in suspended state */ |
59a39919 | 1113 | btrfs_scrub_cancel(fs_info); |
d189dd70 AJ |
1114 | |
1115 | trans = btrfs_start_transaction(root, 0); | |
1116 | if (IS_ERR(trans)) { | |
1117 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
1118 | return PTR_ERR(trans); | |
1119 | } | |
1120 | ret = btrfs_commit_transaction(trans); | |
1121 | WARN_ON(ret); | |
8f2ceaa7 | 1122 | |
d189dd70 AJ |
1123 | btrfs_info_in_rcu(fs_info, |
1124 | "suspended dev_replace from %s (devid %llu) to %s canceled", | |
1125 | btrfs_dev_name(src_device), src_device->devid, | |
1126 | btrfs_dev_name(tgt_device)); | |
1127 | ||
1128 | if (tgt_device) | |
1129 | btrfs_destroy_dev_replace_tgtdev(tgt_device); | |
1130 | break; | |
1131 | default: | |
669e859b | 1132 | up_write(&dev_replace->rwsem); |
d189dd70 AJ |
1133 | result = -EINVAL; |
1134 | } | |
e93c89c1 | 1135 | |
e93c89c1 SB |
1136 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
1137 | return result; | |
1138 | } | |
1139 | ||
1140 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
1141 | { | |
1142 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1143 | ||
1144 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
cb5583dd DS |
1145 | down_write(&dev_replace->rwsem); |
1146 | ||
e93c89c1 SB |
1147 | switch (dev_replace->replace_state) { |
1148 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1149 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1150 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1151 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1152 | break; | |
1153 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1154 | dev_replace->replace_state = | |
1155 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
a944442c | 1156 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 | 1157 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 1158 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
1159 | break; |
1160 | } | |
1161 | ||
cb5583dd | 1162 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1163 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
1164 | } | |
1165 | ||
1166 | /* resume dev_replace procedure that was interrupted by unmount */ | |
1167 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
1168 | { | |
1169 | struct task_struct *task; | |
1170 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1171 | ||
cb5583dd DS |
1172 | down_write(&dev_replace->rwsem); |
1173 | ||
e93c89c1 SB |
1174 | switch (dev_replace->replace_state) { |
1175 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1176 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1177 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
cb5583dd | 1178 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1179 | return 0; |
1180 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1181 | break; | |
1182 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1183 | dev_replace->replace_state = | |
1184 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
1185 | break; | |
1186 | } | |
1187 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 | 1188 | btrfs_info(fs_info, |
5d163e0e JM |
1189 | "cannot continue dev_replace, tgtdev is missing"); |
1190 | btrfs_info(fs_info, | |
1191 | "you may cancel the operation after 'mount -o degraded'"); | |
0d228ece AJ |
1192 | dev_replace->replace_state = |
1193 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 1194 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1195 | return 0; |
1196 | } | |
cb5583dd | 1197 | up_write(&dev_replace->rwsem); |
e93c89c1 | 1198 | |
010a47bd DS |
1199 | /* |
1200 | * This could collide with a paused balance, but the exclusive op logic | |
1201 | * should never allow both to start and pause. We don't want to allow | |
1202 | * dev-replace to start anyway. | |
1203 | */ | |
c3e1f96c | 1204 | if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { |
cb5583dd | 1205 | down_write(&dev_replace->rwsem); |
05c49e6b AJ |
1206 | dev_replace->replace_state = |
1207 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 1208 | up_write(&dev_replace->rwsem); |
010a47bd DS |
1209 | btrfs_info(fs_info, |
1210 | "cannot resume dev-replace, other exclusive operation running"); | |
1211 | return 0; | |
1212 | } | |
1213 | ||
e93c89c1 | 1214 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
8c6ffba0 | 1215 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
1216 | } |
1217 | ||
1218 | static int btrfs_dev_replace_kthread(void *data) | |
1219 | { | |
1220 | struct btrfs_fs_info *fs_info = data; | |
1221 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
e93c89c1 | 1222 | u64 progress; |
00251a52 | 1223 | int ret; |
e93c89c1 | 1224 | |
f1b8a1e8 DS |
1225 | progress = btrfs_dev_replace_progress(fs_info); |
1226 | progress = div_u64(progress, 10); | |
1227 | btrfs_info_in_rcu(fs_info, | |
3c958bd2 AJ |
1228 | "continuing dev_replace from %s (devid %llu) to target %s @%u%%", |
1229 | btrfs_dev_name(dev_replace->srcdev), | |
f1b8a1e8 | 1230 | dev_replace->srcdev->devid, |
3c958bd2 | 1231 | btrfs_dev_name(dev_replace->tgtdev), |
f1b8a1e8 DS |
1232 | (unsigned int)progress); |
1233 | ||
e93c89c1 SB |
1234 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
1235 | dev_replace->committed_cursor_left, | |
7cc8e58d | 1236 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
1237 | &dev_replace->scrub_progress, 0, 1); |
1238 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
49365e69 | 1239 | WARN_ON(ret && ret != -ECANCELED); |
00251a52 | 1240 | |
c3e1f96c | 1241 | btrfs_exclop_finish(fs_info); |
e93c89c1 SB |
1242 | return 0; |
1243 | } | |
1244 | ||
e1f60a65 | 1245 | int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
e93c89c1 SB |
1246 | { |
1247 | if (!dev_replace->is_valid) | |
1248 | return 0; | |
1249 | ||
1250 | switch (dev_replace->replace_state) { | |
1251 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1252 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1253 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1254 | return 0; | |
1255 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1256 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1257 | /* | |
1258 | * return true even if tgtdev is missing (this is | |
1259 | * something that can happen if the dev_replace | |
1260 | * procedure is suspended by an umount and then | |
1261 | * the tgtdev is missing (or "btrfs dev scan") was | |
52042d8e | 1262 | * not called and the filesystem is remounted |
e93c89c1 SB |
1263 | * in degraded state. This does not stop the |
1264 | * dev_replace procedure. It needs to be canceled | |
bb7ab3b9 | 1265 | * manually if the cancellation is wanted. |
e93c89c1 SB |
1266 | */ |
1267 | break; | |
1268 | } | |
1269 | return 1; | |
1270 | } | |
1271 | ||
4245215d | 1272 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
c404e0dc | 1273 | { |
7f8d236a DS |
1274 | percpu_counter_sub(&fs_info->dev_replace.bio_counter, amount); |
1275 | cond_wake_up_nomb(&fs_info->dev_replace.replace_wait); | |
c404e0dc MX |
1276 | } |
1277 | ||
1278 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
1279 | { | |
09dd7a01 | 1280 | while (1) { |
7f8d236a | 1281 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
09dd7a01 ZL |
1282 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1283 | &fs_info->fs_state))) | |
1284 | break; | |
1285 | ||
c404e0dc | 1286 | btrfs_bio_counter_dec(fs_info); |
7f8d236a | 1287 | wait_event(fs_info->dev_replace.replace_wait, |
c404e0dc MX |
1288 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1289 | &fs_info->fs_state)); | |
c404e0dc | 1290 | } |
c404e0dc | 1291 | } |