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" | |
e93c89c1 | 20 | #include "dev-replace.h" |
49c6f736 | 21 | #include "sysfs.h" |
5b316468 | 22 | #include "zoned.h" |
78ce9fc2 | 23 | #include "block-group.h" |
ec8eb376 | 24 | #include "fs.h" |
07e81dc9 | 25 | #include "accessors.h" |
2fc6822c | 26 | #include "scrub.h" |
e93c89c1 | 27 | |
30b3688e QW |
28 | /* |
29 | * Device replace overview | |
30 | * | |
31 | * [Objective] | |
32 | * To copy all extents (both new and on-disk) from source device to target | |
33 | * device, while still keeping the filesystem read-write. | |
34 | * | |
35 | * [Method] | |
36 | * There are two main methods involved: | |
37 | * | |
38 | * - Write duplication | |
39 | * | |
40 | * All new writes will be written to both target and source devices, so even | |
1a9fd417 | 41 | * if replace gets canceled, sources device still contains up-to-date data. |
30b3688e | 42 | * |
cd4efd21 | 43 | * Location: handle_ops_on_dev_replace() from btrfs_map_block() |
30b3688e QW |
44 | * Start: btrfs_dev_replace_start() |
45 | * End: btrfs_dev_replace_finishing() | |
46 | * Content: Latest data/metadata | |
47 | * | |
48 | * - Copy existing extents | |
49 | * | |
50 | * This happens by re-using scrub facility, as scrub also iterates through | |
51 | * existing extents from commit root. | |
52 | * | |
53 | * Location: scrub_write_block_to_dev_replace() from | |
54 | * scrub_block_complete() | |
55 | * Content: Data/meta from commit root. | |
56 | * | |
57 | * Due to the content difference, we need to avoid nocow write when dev-replace | |
58 | * is happening. This is done by marking the block group read-only and waiting | |
59 | * for NOCOW writes. | |
60 | * | |
61 | * After replace is done, the finishing part is done by swapping the target and | |
62 | * source devices. | |
63 | * | |
64 | * Location: btrfs_dev_replace_update_device_in_mapping_tree() from | |
65 | * btrfs_dev_replace_finishing() | |
66 | */ | |
67 | ||
e93c89c1 SB |
68 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
69 | int scrub_ret); | |
e93c89c1 | 70 | static int btrfs_dev_replace_kthread(void *data); |
e93c89c1 SB |
71 | |
72 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
73 | { | |
562d7b15 | 74 | struct btrfs_dev_lookup_args args = { .devid = BTRFS_DEV_REPLACE_DEVID }; |
e93c89c1 SB |
75 | struct btrfs_key key; |
76 | struct btrfs_root *dev_root = fs_info->dev_root; | |
77 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
78 | struct extent_buffer *eb; | |
79 | int slot; | |
80 | int ret = 0; | |
81 | struct btrfs_path *path = NULL; | |
82 | int item_size; | |
83 | struct btrfs_dev_replace_item *ptr; | |
84 | u64 src_devid; | |
85 | ||
3cb89497 JB |
86 | if (!dev_root) |
87 | return 0; | |
88 | ||
e93c89c1 SB |
89 | path = btrfs_alloc_path(); |
90 | if (!path) { | |
91 | ret = -ENOMEM; | |
92 | goto out; | |
93 | } | |
94 | ||
95 | key.objectid = 0; | |
96 | key.type = BTRFS_DEV_REPLACE_KEY; | |
97 | key.offset = 0; | |
98 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
99 | if (ret) { | |
100 | no_valid_dev_replace_entry_found: | |
cf89af14 AJ |
101 | /* |
102 | * We don't have a replace item or it's corrupted. If there is | |
103 | * a replace target, fail the mount. | |
104 | */ | |
562d7b15 | 105 | if (btrfs_find_device(fs_info->fs_devices, &args)) { |
cf89af14 AJ |
106 | btrfs_err(fs_info, |
107 | "found replace target device without a valid replace item"); | |
108 | ret = -EUCLEAN; | |
109 | goto out; | |
110 | } | |
e93c89c1 SB |
111 | ret = 0; |
112 | dev_replace->replace_state = | |
27e022a9 | 113 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; |
e93c89c1 SB |
114 | dev_replace->cont_reading_from_srcdev_mode = |
115 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
e93c89c1 SB |
116 | dev_replace->time_started = 0; |
117 | dev_replace->time_stopped = 0; | |
118 | atomic64_set(&dev_replace->num_write_errors, 0); | |
119 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
120 | dev_replace->cursor_left = 0; | |
121 | dev_replace->committed_cursor_left = 0; | |
122 | dev_replace->cursor_left_last_write_of_item = 0; | |
123 | dev_replace->cursor_right = 0; | |
124 | dev_replace->srcdev = NULL; | |
125 | dev_replace->tgtdev = NULL; | |
126 | dev_replace->is_valid = 0; | |
127 | dev_replace->item_needs_writeback = 0; | |
128 | goto out; | |
129 | } | |
130 | slot = path->slots[0]; | |
131 | eb = path->nodes[0]; | |
3212fa14 | 132 | item_size = btrfs_item_size(eb, slot); |
e93c89c1 SB |
133 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); |
134 | ||
135 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
efe120a0 FH |
136 | btrfs_warn(fs_info, |
137 | "dev_replace entry found has unexpected size, ignore entry"); | |
e93c89c1 SB |
138 | goto no_valid_dev_replace_entry_found; |
139 | } | |
140 | ||
141 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
142 | dev_replace->cont_reading_from_srcdev_mode = | |
143 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
144 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
145 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
146 | dev_replace->time_stopped = | |
147 | btrfs_dev_replace_time_stopped(eb, ptr); | |
148 | atomic64_set(&dev_replace->num_write_errors, | |
149 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
150 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
151 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
152 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
153 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
154 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
155 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
156 | dev_replace->is_valid = 1; | |
157 | ||
158 | dev_replace->item_needs_writeback = 0; | |
159 | switch (dev_replace->replace_state) { | |
160 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
161 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
162 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
cf89af14 AJ |
163 | /* |
164 | * We don't have an active replace item but if there is a | |
165 | * replace target, fail the mount. | |
166 | */ | |
562d7b15 | 167 | if (btrfs_find_device(fs_info->fs_devices, &args)) { |
cf89af14 | 168 | btrfs_err(fs_info, |
f2c3bec2 | 169 | "replace without active item, run 'device scan --forget' on the target device"); |
cf89af14 AJ |
170 | ret = -EUCLEAN; |
171 | } else { | |
172 | dev_replace->srcdev = NULL; | |
173 | dev_replace->tgtdev = NULL; | |
174 | } | |
e93c89c1 SB |
175 | break; |
176 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
177 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
562d7b15 JB |
178 | dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices, &args); |
179 | args.devid = src_devid; | |
180 | dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices, &args); | |
181 | ||
e93c89c1 SB |
182 | /* |
183 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
184 | * missing | |
185 | */ | |
186 | if (!dev_replace->srcdev && | |
0b246afa | 187 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 188 | ret = -EIO; |
efe120a0 FH |
189 | btrfs_warn(fs_info, |
190 | "cannot mount because device replace operation is ongoing and"); | |
191 | btrfs_warn(fs_info, | |
192 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
193 | src_devid); | |
e93c89c1 SB |
194 | } |
195 | if (!dev_replace->tgtdev && | |
0b246afa | 196 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 197 | ret = -EIO; |
efe120a0 FH |
198 | btrfs_warn(fs_info, |
199 | "cannot mount because device replace operation is ongoing and"); | |
200 | btrfs_warn(fs_info, | |
201 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
6e71c47a | 202 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
203 | } |
204 | if (dev_replace->tgtdev) { | |
205 | if (dev_replace->srcdev) { | |
206 | dev_replace->tgtdev->total_bytes = | |
207 | dev_replace->srcdev->total_bytes; | |
208 | dev_replace->tgtdev->disk_total_bytes = | |
209 | dev_replace->srcdev->disk_total_bytes; | |
935e5cc9 MX |
210 | dev_replace->tgtdev->commit_total_bytes = |
211 | dev_replace->srcdev->commit_total_bytes; | |
e93c89c1 SB |
212 | dev_replace->tgtdev->bytes_used = |
213 | dev_replace->srcdev->bytes_used; | |
ce7213c7 MX |
214 | dev_replace->tgtdev->commit_bytes_used = |
215 | dev_replace->srcdev->commit_bytes_used; | |
e93c89c1 | 216 | } |
401e29c1 AJ |
217 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, |
218 | &dev_replace->tgtdev->dev_state); | |
15fc1283 AJ |
219 | |
220 | WARN_ON(fs_info->fs_devices->rw_devices == 0); | |
221 | dev_replace->tgtdev->io_width = fs_info->sectorsize; | |
222 | dev_replace->tgtdev->io_align = fs_info->sectorsize; | |
223 | dev_replace->tgtdev->sector_size = fs_info->sectorsize; | |
224 | dev_replace->tgtdev->fs_info = fs_info; | |
225 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, | |
226 | &dev_replace->tgtdev->dev_state); | |
e93c89c1 SB |
227 | } |
228 | break; | |
229 | } | |
230 | ||
231 | out: | |
527afb44 | 232 | btrfs_free_path(path); |
e93c89c1 SB |
233 | return ret; |
234 | } | |
235 | ||
d48f39d5 DS |
236 | /* |
237 | * Initialize a new device for device replace target from a given source dev | |
238 | * and path. | |
239 | * | |
240 | * Return 0 and new device in @device_out, otherwise return < 0 | |
241 | */ | |
242 | static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
243 | const char *device_path, | |
244 | struct btrfs_device *srcdev, | |
245 | struct btrfs_device **device_out) | |
246 | { | |
bef16b52 | 247 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
d48f39d5 | 248 | struct btrfs_device *device; |
86ec15d0 | 249 | struct bdev_handle *bdev_handle; |
d48f39d5 | 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 | ||
86ec15d0 JK |
260 | bdev_handle = bdev_open_by_path(device_path, BLK_OPEN_WRITE, |
261 | fs_info->bdev_holder, NULL); | |
262 | if (IS_ERR(bdev_handle)) { | |
d48f39d5 | 263 | btrfs_err(fs_info, "target device %s is invalid!", device_path); |
86ec15d0 | 264 | return PTR_ERR(bdev_handle); |
d48f39d5 | 265 | } |
86ec15d0 | 266 | bdev = bdev_handle->bdev; |
d48f39d5 | 267 | |
b70f5097 NA |
268 | if (!btrfs_check_device_zone_type(fs_info, bdev)) { |
269 | btrfs_err(fs_info, | |
270 | "dev-replace: zoned type of target device mismatch with filesystem"); | |
271 | ret = -EINVAL; | |
272 | goto error; | |
273 | } | |
274 | ||
ddb93784 | 275 | sync_blockdev(bdev); |
d48f39d5 | 276 | |
bef16b52 | 277 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
d48f39d5 DS |
278 | if (device->bdev == bdev) { |
279 | btrfs_err(fs_info, | |
280 | "target device is in the filesystem!"); | |
281 | ret = -EEXIST; | |
282 | goto error; | |
283 | } | |
284 | } | |
285 | ||
286 | ||
cda00eba | 287 | if (bdev_nr_bytes(bdev) < btrfs_device_get_total_bytes(srcdev)) { |
d48f39d5 DS |
288 | btrfs_err(fs_info, |
289 | "target device is smaller than source device!"); | |
290 | ret = -EINVAL; | |
291 | goto error; | |
292 | } | |
293 | ||
294 | ||
bb21e302 | 295 | device = btrfs_alloc_device(NULL, &devid, NULL, device_path); |
d48f39d5 DS |
296 | if (IS_ERR(device)) { |
297 | ret = PTR_ERR(device); | |
298 | goto error; | |
299 | } | |
300 | ||
4889bc05 AJ |
301 | ret = lookup_bdev(device_path, &device->devt); |
302 | if (ret) | |
303 | goto error; | |
d48f39d5 | 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; | |
86ec15d0 | 317 | device->bdev_handle = bdev_handle; |
d48f39d5 DS |
318 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); |
319 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); | |
d48f39d5 DS |
320 | device->dev_stats_valid = 1; |
321 | set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE); | |
bef16b52 | 322 | device->fs_devices = fs_devices; |
b0d9e1ea | 323 | |
16beac87 | 324 | ret = btrfs_get_dev_zone_info(device, false); |
5b316468 NA |
325 | if (ret) |
326 | goto error; | |
327 | ||
bef16b52 AJ |
328 | mutex_lock(&fs_devices->device_list_mutex); |
329 | list_add(&device->dev_list, &fs_devices->devices); | |
330 | fs_devices->num_devices++; | |
331 | fs_devices->open_devices++; | |
332 | mutex_unlock(&fs_devices->device_list_mutex); | |
d48f39d5 DS |
333 | |
334 | *device_out = device; | |
335 | return 0; | |
336 | ||
337 | error: | |
86ec15d0 | 338 | bdev_release(bdev_handle); |
d48f39d5 DS |
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 && | |
3212fa14 | 383 | btrfs_item_size(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { |
e93c89c1 SB |
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 | 445 | |
50564b65 | 446 | btrfs_mark_buffer_dirty(trans, eb); |
e93c89c1 SB |
447 | |
448 | out: | |
449 | btrfs_free_path(path); | |
450 | ||
451 | return ret; | |
452 | } | |
453 | ||
78ce9fc2 NA |
454 | static int mark_block_group_to_copy(struct btrfs_fs_info *fs_info, |
455 | struct btrfs_device *src_dev) | |
456 | { | |
457 | struct btrfs_path *path; | |
458 | struct btrfs_key key; | |
459 | struct btrfs_key found_key; | |
460 | struct btrfs_root *root = fs_info->dev_root; | |
461 | struct btrfs_dev_extent *dev_extent = NULL; | |
462 | struct btrfs_block_group *cache; | |
463 | struct btrfs_trans_handle *trans; | |
9bc5fc04 | 464 | int iter_ret = 0; |
78ce9fc2 NA |
465 | int ret = 0; |
466 | u64 chunk_offset; | |
467 | ||
468 | /* Do not use "to_copy" on non zoned filesystem for now */ | |
469 | if (!btrfs_is_zoned(fs_info)) | |
470 | return 0; | |
471 | ||
472 | mutex_lock(&fs_info->chunk_mutex); | |
473 | ||
474 | /* Ensure we don't have pending new block group */ | |
475 | spin_lock(&fs_info->trans_lock); | |
476 | while (fs_info->running_transaction && | |
477 | !list_empty(&fs_info->running_transaction->dev_update_list)) { | |
478 | spin_unlock(&fs_info->trans_lock); | |
479 | mutex_unlock(&fs_info->chunk_mutex); | |
480 | trans = btrfs_attach_transaction(root); | |
481 | if (IS_ERR(trans)) { | |
482 | ret = PTR_ERR(trans); | |
483 | mutex_lock(&fs_info->chunk_mutex); | |
484 | if (ret == -ENOENT) { | |
485 | spin_lock(&fs_info->trans_lock); | |
486 | continue; | |
487 | } else { | |
488 | goto unlock; | |
489 | } | |
490 | } | |
491 | ||
492 | ret = btrfs_commit_transaction(trans); | |
493 | mutex_lock(&fs_info->chunk_mutex); | |
494 | if (ret) | |
495 | goto unlock; | |
496 | ||
497 | spin_lock(&fs_info->trans_lock); | |
498 | } | |
499 | spin_unlock(&fs_info->trans_lock); | |
500 | ||
501 | path = btrfs_alloc_path(); | |
502 | if (!path) { | |
503 | ret = -ENOMEM; | |
504 | goto unlock; | |
505 | } | |
506 | ||
507 | path->reada = READA_FORWARD; | |
508 | path->search_commit_root = 1; | |
509 | path->skip_locking = 1; | |
510 | ||
511 | key.objectid = src_dev->devid; | |
512 | key.type = BTRFS_DEV_EXTENT_KEY; | |
513 | key.offset = 0; | |
514 | ||
9bc5fc04 | 515 | btrfs_for_each_slot(root, &key, &found_key, path, iter_ret) { |
78ce9fc2 | 516 | struct extent_buffer *leaf = path->nodes[0]; |
78ce9fc2 NA |
517 | |
518 | if (found_key.objectid != src_dev->devid) | |
519 | break; | |
520 | ||
521 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) | |
522 | break; | |
523 | ||
524 | if (found_key.offset < key.offset) | |
525 | break; | |
526 | ||
9bc5fc04 | 527 | dev_extent = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent); |
78ce9fc2 NA |
528 | |
529 | chunk_offset = btrfs_dev_extent_chunk_offset(leaf, dev_extent); | |
530 | ||
531 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); | |
532 | if (!cache) | |
9bc5fc04 | 533 | continue; |
78ce9fc2 | 534 | |
3349b57f | 535 | set_bit(BLOCK_GROUP_FLAG_TO_COPY, &cache->runtime_flags); |
78ce9fc2 | 536 | btrfs_put_block_group(cache); |
78ce9fc2 | 537 | } |
9bc5fc04 GN |
538 | if (iter_ret < 0) |
539 | ret = iter_ret; | |
78ce9fc2 | 540 | |
78ce9fc2 NA |
541 | btrfs_free_path(path); |
542 | unlock: | |
543 | mutex_unlock(&fs_info->chunk_mutex); | |
544 | ||
545 | return ret; | |
546 | } | |
547 | ||
548 | bool btrfs_finish_block_group_to_copy(struct btrfs_device *srcdev, | |
549 | struct btrfs_block_group *cache, | |
550 | u64 physical) | |
551 | { | |
552 | struct btrfs_fs_info *fs_info = cache->fs_info; | |
553 | struct extent_map *em; | |
554 | struct map_lookup *map; | |
555 | u64 chunk_offset = cache->start; | |
556 | int num_extents, cur_extent; | |
557 | int i; | |
558 | ||
559 | /* Do not use "to_copy" on non zoned filesystem for now */ | |
560 | if (!btrfs_is_zoned(fs_info)) | |
561 | return true; | |
562 | ||
563 | spin_lock(&cache->lock); | |
3349b57f | 564 | if (test_bit(BLOCK_GROUP_FLAG_REMOVED, &cache->runtime_flags)) { |
78ce9fc2 NA |
565 | spin_unlock(&cache->lock); |
566 | return true; | |
567 | } | |
568 | spin_unlock(&cache->lock); | |
569 | ||
570 | em = btrfs_get_chunk_map(fs_info, chunk_offset, 1); | |
571 | ASSERT(!IS_ERR(em)); | |
572 | map = em->map_lookup; | |
573 | ||
c1867eb3 DS |
574 | num_extents = 0; |
575 | cur_extent = 0; | |
78ce9fc2 NA |
576 | for (i = 0; i < map->num_stripes; i++) { |
577 | /* We have more device extent to copy */ | |
578 | if (srcdev != map->stripes[i].dev) | |
579 | continue; | |
580 | ||
581 | num_extents++; | |
582 | if (physical == map->stripes[i].physical) | |
583 | cur_extent = i; | |
584 | } | |
585 | ||
586 | free_extent_map(em); | |
587 | ||
588 | if (num_extents > 1 && cur_extent < num_extents - 1) { | |
589 | /* | |
590 | * Has more stripes on this device. Keep this block group | |
591 | * readonly until we finish all the stripes. | |
592 | */ | |
593 | return false; | |
594 | } | |
595 | ||
596 | /* Last stripe on this device */ | |
3349b57f | 597 | clear_bit(BLOCK_GROUP_FLAG_TO_COPY, &cache->runtime_flags); |
78ce9fc2 NA |
598 | |
599 | return true; | |
600 | } | |
601 | ||
54862d6d | 602 | static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
da353f6b DS |
603 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, |
604 | int read_src) | |
e93c89c1 | 605 | { |
2ff7e61e | 606 | struct btrfs_root *root = fs_info->dev_root; |
e93c89c1 | 607 | struct btrfs_trans_handle *trans; |
e93c89c1 SB |
608 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
609 | int ret; | |
610 | struct btrfs_device *tgt_device = NULL; | |
611 | struct btrfs_device *src_device = NULL; | |
612 | ||
a27a94c2 NB |
613 | src_device = btrfs_find_device_by_devspec(fs_info, srcdevid, |
614 | srcdev_name); | |
615 | if (IS_ERR(src_device)) | |
616 | return PTR_ERR(src_device); | |
e93c89c1 | 617 | |
eede2bf3 OS |
618 | if (btrfs_pinned_by_swapfile(fs_info, src_device)) { |
619 | btrfs_warn_in_rcu(fs_info, | |
620 | "cannot replace device %s (devid %llu) due to active swapfile", | |
621 | btrfs_dev_name(src_device), src_device->devid); | |
622 | return -ETXTBSY; | |
623 | } | |
624 | ||
9e271ae2 AJ |
625 | /* |
626 | * Here we commit the transaction to make sure commit_total_bytes | |
627 | * of all the devices are updated. | |
628 | */ | |
629 | trans = btrfs_attach_transaction(root); | |
630 | if (!IS_ERR(trans)) { | |
3a45bb20 | 631 | ret = btrfs_commit_transaction(trans); |
9e271ae2 AJ |
632 | if (ret) |
633 | return ret; | |
634 | } else if (PTR_ERR(trans) != -ENOENT) { | |
635 | return PTR_ERR(trans); | |
636 | } | |
637 | ||
e1e0eb43 NB |
638 | ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name, |
639 | src_device, &tgt_device); | |
640 | if (ret) | |
641 | return ret; | |
642 | ||
78ce9fc2 NA |
643 | ret = mark_block_group_to_copy(fs_info, src_device); |
644 | if (ret) | |
645 | return ret; | |
646 | ||
cb5583dd | 647 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
648 | switch (dev_replace->replace_state) { |
649 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
650 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
651 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
652 | break; | |
653 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
654 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
5c061471 | 655 | ASSERT(0); |
b5255456 | 656 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
fa19452a | 657 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
658 | goto leave; |
659 | } | |
660 | ||
b5255456 | 661 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
e93c89c1 | 662 | dev_replace->srcdev = src_device; |
e93c89c1 SB |
663 | dev_replace->tgtdev = tgt_device; |
664 | ||
fc23c246 | 665 | btrfs_info_in_rcu(fs_info, |
ecaeb14b | 666 | "dev_replace from %s (devid %llu) to %s started", |
3c958bd2 | 667 | btrfs_dev_name(src_device), |
e93c89c1 | 668 | src_device->devid, |
cb3e217b | 669 | btrfs_dev_name(tgt_device)); |
e93c89c1 | 670 | |
e93c89c1 SB |
671 | /* |
672 | * from now on, the writes to the srcdev are all duplicated to | |
673 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
674 | */ | |
675 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
a944442c | 676 | dev_replace->time_started = ktime_get_real_seconds(); |
e93c89c1 SB |
677 | dev_replace->cursor_left = 0; |
678 | dev_replace->committed_cursor_left = 0; | |
679 | dev_replace->cursor_left_last_write_of_item = 0; | |
680 | dev_replace->cursor_right = 0; | |
681 | dev_replace->is_valid = 1; | |
682 | dev_replace->item_needs_writeback = 1; | |
7ccefb98 YK |
683 | atomic64_set(&dev_replace->num_write_errors, 0); |
684 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
cb5583dd | 685 | up_write(&dev_replace->rwsem); |
e93c89c1 | 686 | |
cd36da2e | 687 | ret = btrfs_sysfs_add_device(tgt_device); |
73416dab | 688 | if (ret) |
ab8d0fc4 | 689 | btrfs_err(fs_info, "kobj add dev failed %d", ret); |
73416dab | 690 | |
6374e57a | 691 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 | 692 | |
a692e13d FM |
693 | /* |
694 | * Commit dev_replace state and reserve 1 item for it. | |
695 | * This is crucial to ensure we won't miss copying extents for new block | |
696 | * groups that are allocated after we started the device replace, and | |
697 | * must be done after setting up the device replace state. | |
698 | */ | |
f232ab04 | 699 | trans = btrfs_start_transaction(root, 1); |
e93c89c1 SB |
700 | if (IS_ERR(trans)) { |
701 | ret = PTR_ERR(trans); | |
cb5583dd | 702 | down_write(&dev_replace->rwsem); |
5c061471 JM |
703 | dev_replace->replace_state = |
704 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; | |
705 | dev_replace->srcdev = NULL; | |
706 | dev_replace->tgtdev = NULL; | |
fa19452a | 707 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
708 | goto leave; |
709 | } | |
710 | ||
3a45bb20 | 711 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
712 | WARN_ON(ret); |
713 | ||
714 | /* the disk copy procedure reuses the scrub code */ | |
715 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 716 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
717 | &dev_replace->scrub_progress, 0, 1); |
718 | ||
fc23c246 | 719 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
4cea9037 | 720 | if (ret == -EINPROGRESS) |
b5255456 | 721 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
e93c89c1 | 722 | |
2fc9f6ba | 723 | return ret; |
e93c89c1 SB |
724 | |
725 | leave: | |
4f5ad7bd | 726 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
e93c89c1 SB |
727 | return ret; |
728 | } | |
729 | ||
2ff7e61e | 730 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
b5255456 AJ |
731 | struct btrfs_ioctl_dev_replace_args *args) |
732 | { | |
733 | int ret; | |
734 | ||
735 | switch (args->start.cont_reading_from_srcdev_mode) { | |
736 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
737 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
738 | break; | |
739 | default: | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
743 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
744 | args->start.tgtdev_name[0] == '\0') | |
745 | return -EINVAL; | |
746 | ||
2ff7e61e | 747 | ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name, |
b5255456 AJ |
748 | args->start.srcdevid, |
749 | args->start.srcdev_name, | |
750 | args->start.cont_reading_from_srcdev_mode); | |
751 | args->result = ret; | |
752 | /* don't warn if EINPROGRESS, someone else might be running scrub */ | |
53e62fb5 AJ |
753 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS || |
754 | ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) | |
755 | return 0; | |
b5255456 AJ |
756 | |
757 | return ret; | |
758 | } | |
759 | ||
c404e0dc | 760 | /* |
01327610 | 761 | * blocked until all in-flight bios operations are finished. |
c404e0dc MX |
762 | */ |
763 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
764 | { | |
c404e0dc | 765 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
7f8d236a DS |
766 | wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum( |
767 | &fs_info->dev_replace.bio_counter)); | |
c404e0dc MX |
768 | } |
769 | ||
770 | /* | |
771 | * we have removed target device, it is safe to allow new bios request. | |
772 | */ | |
773 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
774 | { | |
775 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
7f8d236a | 776 | wake_up(&fs_info->dev_replace.replace_wait); |
c404e0dc MX |
777 | } |
778 | ||
4c8f3532 FM |
779 | /* |
780 | * When finishing the device replace, before swapping the source device with the | |
781 | * target device we must update the chunk allocation state in the target device, | |
782 | * as it is empty because replace works by directly copying the chunks and not | |
783 | * through the normal chunk allocation path. | |
784 | */ | |
785 | static int btrfs_set_target_alloc_state(struct btrfs_device *srcdev, | |
786 | struct btrfs_device *tgtdev) | |
787 | { | |
788 | struct extent_state *cached_state = NULL; | |
789 | u64 start = 0; | |
790 | u64 found_start; | |
791 | u64 found_end; | |
792 | int ret = 0; | |
793 | ||
794 | lockdep_assert_held(&srcdev->fs_info->chunk_mutex); | |
795 | ||
e5860f82 FM |
796 | while (find_first_extent_bit(&srcdev->alloc_state, start, |
797 | &found_start, &found_end, | |
798 | CHUNK_ALLOCATED, &cached_state)) { | |
0acd32c2 | 799 | ret = set_extent_bit(&tgtdev->alloc_state, found_start, |
1d126800 | 800 | found_end, CHUNK_ALLOCATED, NULL); |
4c8f3532 FM |
801 | if (ret) |
802 | break; | |
803 | start = found_end + 1; | |
804 | } | |
805 | ||
806 | free_extent_state(cached_state); | |
807 | return ret; | |
808 | } | |
809 | ||
0725c0c9 AJ |
810 | static void btrfs_dev_replace_update_device_in_mapping_tree( |
811 | struct btrfs_fs_info *fs_info, | |
812 | struct btrfs_device *srcdev, | |
813 | struct btrfs_device *tgtdev) | |
814 | { | |
815 | struct extent_map_tree *em_tree = &fs_info->mapping_tree; | |
816 | struct extent_map *em; | |
817 | struct map_lookup *map; | |
818 | u64 start = 0; | |
819 | int i; | |
820 | ||
821 | write_lock(&em_tree->lock); | |
822 | do { | |
823 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
824 | if (!em) | |
825 | break; | |
826 | map = em->map_lookup; | |
827 | for (i = 0; i < map->num_stripes; i++) | |
828 | if (srcdev == map->stripes[i].dev) | |
829 | map->stripes[i].dev = tgtdev; | |
830 | start = em->start + em->len; | |
831 | free_extent_map(em); | |
832 | } while (start); | |
833 | write_unlock(&em_tree->lock); | |
834 | } | |
835 | ||
e93c89c1 SB |
836 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
837 | int scrub_ret) | |
838 | { | |
839 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
b67d73c1 | 840 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
e93c89c1 SB |
841 | struct btrfs_device *tgt_device; |
842 | struct btrfs_device *src_device; | |
843 | struct btrfs_root *root = fs_info->tree_root; | |
844 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
845 | struct btrfs_trans_handle *trans; | |
846 | int ret = 0; | |
847 | ||
848 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
849 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
850 | ||
cb5583dd | 851 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
852 | /* was the operation canceled, or is it finished? */ |
853 | if (dev_replace->replace_state != | |
854 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
cb5583dd | 855 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
856 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
857 | return 0; | |
858 | } | |
859 | ||
860 | tgt_device = dev_replace->tgtdev; | |
861 | src_device = dev_replace->srcdev; | |
cb5583dd | 862 | up_read(&dev_replace->rwsem); |
e93c89c1 | 863 | |
e93c89c1 SB |
864 | /* |
865 | * flush all outstanding I/O and inode extent mappings before the | |
866 | * copy operation is declared as being finished | |
867 | */ | |
9db4dc24 | 868 | ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); |
3edb2a68 MX |
869 | if (ret) { |
870 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
871 | return ret; | |
872 | } | |
6374e57a | 873 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 | 874 | |
debd1c06 NB |
875 | /* |
876 | * We have to use this loop approach because at this point src_device | |
877 | * has to be available for transaction commit to complete, yet new | |
878 | * chunks shouldn't be allocated on the device. | |
879 | */ | |
880 | while (1) { | |
881 | trans = btrfs_start_transaction(root, 0); | |
882 | if (IS_ERR(trans)) { | |
883 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
884 | return PTR_ERR(trans); | |
885 | } | |
886 | ret = btrfs_commit_transaction(trans); | |
887 | WARN_ON(ret); | |
888 | ||
889 | /* Prevent write_all_supers() during the finishing procedure */ | |
b67d73c1 | 890 | mutex_lock(&fs_devices->device_list_mutex); |
debd1c06 NB |
891 | /* Prevent new chunks being allocated on the source device */ |
892 | mutex_lock(&fs_info->chunk_mutex); | |
893 | ||
894 | if (!list_empty(&src_device->post_commit_list)) { | |
b67d73c1 | 895 | mutex_unlock(&fs_devices->device_list_mutex); |
debd1c06 NB |
896 | mutex_unlock(&fs_info->chunk_mutex); |
897 | } else { | |
898 | break; | |
899 | } | |
e93c89c1 | 900 | } |
e93c89c1 | 901 | |
cb5583dd | 902 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
903 | dev_replace->replace_state = |
904 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
905 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
906 | dev_replace->tgtdev = NULL; | |
907 | dev_replace->srcdev = NULL; | |
a944442c | 908 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 SB |
909 | dev_replace->item_needs_writeback = 1; |
910 | ||
4c8f3532 FM |
911 | /* |
912 | * Update allocation state in the new device and replace the old device | |
913 | * with the new one in the mapping tree. | |
914 | */ | |
c404e0dc | 915 | if (!scrub_ret) { |
4c8f3532 FM |
916 | scrub_ret = btrfs_set_target_alloc_state(src_device, tgt_device); |
917 | if (scrub_ret) | |
918 | goto error; | |
c404e0dc MX |
919 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
920 | src_device, | |
921 | tgt_device); | |
922 | } else { | |
f9085abf AJ |
923 | if (scrub_ret != -ECANCELED) |
924 | btrfs_err_in_rcu(fs_info, | |
0b246afa | 925 | "btrfs_scrub_dev(%s, %llu, %s) failed %d", |
3c958bd2 | 926 | btrfs_dev_name(src_device), |
0b246afa | 927 | src_device->devid, |
cb3e217b | 928 | btrfs_dev_name(tgt_device), scrub_ret); |
4c8f3532 | 929 | error: |
cb5583dd | 930 | up_write(&dev_replace->rwsem); |
0b246afa | 931 | mutex_unlock(&fs_info->chunk_mutex); |
b67d73c1 | 932 | mutex_unlock(&fs_devices->device_list_mutex); |
ae6529c3 | 933 | btrfs_rm_dev_replace_blocked(fs_info); |
e93c89c1 | 934 | if (tgt_device) |
4f5ad7bd | 935 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
ae6529c3 | 936 | btrfs_rm_dev_replace_unblocked(fs_info); |
e93c89c1 SB |
937 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
938 | ||
2fc9f6ba | 939 | return scrub_ret; |
e93c89c1 SB |
940 | } |
941 | ||
0b246afa JM |
942 | btrfs_info_in_rcu(fs_info, |
943 | "dev_replace from %s (devid %llu) to %s finished", | |
3c958bd2 | 944 | btrfs_dev_name(src_device), |
0b246afa | 945 | src_device->devid, |
cb3e217b | 946 | btrfs_dev_name(tgt_device)); |
401e29c1 | 947 | clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &tgt_device->dev_state); |
e93c89c1 SB |
948 | tgt_device->devid = src_device->devid; |
949 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
950 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
951 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
952 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
953 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
954 | btrfs_device_set_disk_total_bytes(tgt_device, | |
955 | src_device->disk_total_bytes); | |
956 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
ce7213c7 | 957 | tgt_device->commit_bytes_used = src_device->bytes_used; |
88acff64 | 958 | |
d6507cf1 | 959 | btrfs_assign_next_active_device(src_device, tgt_device); |
88acff64 | 960 | |
b67d73c1 AJ |
961 | list_add(&tgt_device->dev_alloc_list, &fs_devices->alloc_list); |
962 | fs_devices->rw_devices++; | |
e93c89c1 | 963 | |
cb5583dd | 964 | up_write(&dev_replace->rwsem); |
c404e0dc MX |
965 | btrfs_rm_dev_replace_blocked(fs_info); |
966 | ||
68a9db5f | 967 | btrfs_rm_dev_replace_remove_srcdev(src_device); |
1357272f | 968 | |
c404e0dc MX |
969 | btrfs_rm_dev_replace_unblocked(fs_info); |
970 | ||
1e7e1f9e MT |
971 | /* |
972 | * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will | |
973 | * update on-disk dev stats value during commit transaction | |
974 | */ | |
975 | atomic_inc(&tgt_device->dev_stats_ccnt); | |
976 | ||
e93c89c1 SB |
977 | /* |
978 | * this is again a consistent state where no dev_replace procedure | |
979 | * is running, the target device is part of the filesystem, the | |
980 | * source device is not part of the filesystem anymore and its 1st | |
981 | * superblock is scratched out so that it is no longer marked to | |
982 | * belong to this filesystem. | |
983 | */ | |
0b246afa | 984 | mutex_unlock(&fs_info->chunk_mutex); |
b67d73c1 | 985 | mutex_unlock(&fs_devices->device_list_mutex); |
e93c89c1 | 986 | |
084b6e7c | 987 | /* replace the sysfs entry */ |
53f8a74c | 988 | btrfs_sysfs_remove_device(src_device); |
668e48af | 989 | btrfs_sysfs_update_devid(tgt_device); |
313b0858 JB |
990 | if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state)) |
991 | btrfs_scratch_superblocks(fs_info, src_device->bdev, | |
992 | src_device->name->str); | |
084b6e7c | 993 | |
e93c89c1 SB |
994 | /* write back the superblocks */ |
995 | trans = btrfs_start_transaction(root, 0); | |
996 | if (!IS_ERR(trans)) | |
3a45bb20 | 997 | btrfs_commit_transaction(trans); |
e93c89c1 SB |
998 | |
999 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
1000 | ||
a466c85e JB |
1001 | btrfs_rm_dev_replace_free_srcdev(src_device); |
1002 | ||
e93c89c1 SB |
1003 | return 0; |
1004 | } | |
1005 | ||
74b595fe DS |
1006 | /* |
1007 | * Read progress of device replace status according to the state and last | |
1008 | * stored position. The value format is the same as for | |
1009 | * btrfs_dev_replace::progress_1000 | |
1010 | */ | |
1011 | static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info) | |
1012 | { | |
1013 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1014 | u64 ret = 0; | |
1015 | ||
1016 | switch (dev_replace->replace_state) { | |
1017 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1018 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1019 | ret = 0; | |
1020 | break; | |
1021 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1022 | ret = 1000; | |
1023 | break; | |
1024 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1025 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1026 | ret = div64_u64(dev_replace->cursor_left, | |
1027 | div_u64(btrfs_device_get_total_bytes( | |
1028 | dev_replace->srcdev), 1000)); | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | return ret; | |
1033 | } | |
1034 | ||
e93c89c1 SB |
1035 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
1036 | struct btrfs_ioctl_dev_replace_args *args) | |
1037 | { | |
1038 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1039 | ||
cb5583dd | 1040 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
1041 | /* even if !dev_replace_is_valid, the values are good enough for |
1042 | * the replace_status ioctl */ | |
1043 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
1044 | args->status.replace_state = dev_replace->replace_state; | |
1045 | args->status.time_started = dev_replace->time_started; | |
1046 | args->status.time_stopped = dev_replace->time_stopped; | |
1047 | args->status.num_write_errors = | |
1048 | atomic64_read(&dev_replace->num_write_errors); | |
1049 | args->status.num_uncorrectable_read_errors = | |
1050 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
74b595fe | 1051 | args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); |
cb5583dd | 1052 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
1053 | } |
1054 | ||
18e67c73 | 1055 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
e93c89c1 SB |
1056 | { |
1057 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1058 | struct btrfs_device *tgt_device = NULL; | |
8f2ceaa7 | 1059 | struct btrfs_device *src_device = NULL; |
e93c89c1 SB |
1060 | struct btrfs_trans_handle *trans; |
1061 | struct btrfs_root *root = fs_info->tree_root; | |
18e67c73 | 1062 | int result; |
e93c89c1 SB |
1063 | int ret; |
1064 | ||
bc98a42c | 1065 | if (sb_rdonly(fs_info->sb)) |
e649e587 ID |
1066 | return -EROFS; |
1067 | ||
e93c89c1 | 1068 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
cb5583dd | 1069 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
1070 | switch (dev_replace->replace_state) { |
1071 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1072 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1073 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1074 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
cb5583dd | 1075 | up_write(&dev_replace->rwsem); |
d189dd70 | 1076 | break; |
e93c89c1 | 1077 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
d189dd70 AJ |
1078 | tgt_device = dev_replace->tgtdev; |
1079 | src_device = dev_replace->srcdev; | |
cb5583dd | 1080 | up_write(&dev_replace->rwsem); |
b47dda2e AJ |
1081 | ret = btrfs_scrub_cancel(fs_info); |
1082 | if (ret < 0) { | |
1083 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
1084 | } else { | |
1085 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
1086 | /* | |
1087 | * btrfs_dev_replace_finishing() will handle the | |
1088 | * cleanup part | |
1089 | */ | |
1090 | btrfs_info_in_rcu(fs_info, | |
1091 | "dev_replace from %s (devid %llu) to %s canceled", | |
1092 | btrfs_dev_name(src_device), src_device->devid, | |
1093 | btrfs_dev_name(tgt_device)); | |
1094 | } | |
d189dd70 | 1095 | break; |
e93c89c1 | 1096 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
d189dd70 AJ |
1097 | /* |
1098 | * Scrub doing the replace isn't running so we need to do the | |
1099 | * cleanup step of btrfs_dev_replace_finishing() here | |
1100 | */ | |
e93c89c1 SB |
1101 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
1102 | tgt_device = dev_replace->tgtdev; | |
8f2ceaa7 | 1103 | src_device = dev_replace->srcdev; |
e93c89c1 SB |
1104 | dev_replace->tgtdev = NULL; |
1105 | dev_replace->srcdev = NULL; | |
d189dd70 AJ |
1106 | dev_replace->replace_state = |
1107 | BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
1108 | dev_replace->time_stopped = ktime_get_real_seconds(); | |
1109 | dev_replace->item_needs_writeback = 1; | |
e93c89c1 | 1110 | |
cb5583dd | 1111 | up_write(&dev_replace->rwsem); |
8f2ceaa7 | 1112 | |
fe97e2e1 | 1113 | /* Scrub for replace must not be running in suspended state */ |
59a39919 | 1114 | btrfs_scrub_cancel(fs_info); |
d189dd70 AJ |
1115 | |
1116 | trans = btrfs_start_transaction(root, 0); | |
1117 | if (IS_ERR(trans)) { | |
1118 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
1119 | return PTR_ERR(trans); | |
1120 | } | |
1121 | ret = btrfs_commit_transaction(trans); | |
1122 | WARN_ON(ret); | |
8f2ceaa7 | 1123 | |
d189dd70 AJ |
1124 | btrfs_info_in_rcu(fs_info, |
1125 | "suspended dev_replace from %s (devid %llu) to %s canceled", | |
1126 | btrfs_dev_name(src_device), src_device->devid, | |
1127 | btrfs_dev_name(tgt_device)); | |
1128 | ||
1129 | if (tgt_device) | |
1130 | btrfs_destroy_dev_replace_tgtdev(tgt_device); | |
1131 | break; | |
1132 | default: | |
669e859b | 1133 | up_write(&dev_replace->rwsem); |
d189dd70 AJ |
1134 | result = -EINVAL; |
1135 | } | |
e93c89c1 | 1136 | |
e93c89c1 SB |
1137 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
1138 | return result; | |
1139 | } | |
1140 | ||
1141 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
1142 | { | |
1143 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1144 | ||
1145 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
cb5583dd DS |
1146 | down_write(&dev_replace->rwsem); |
1147 | ||
e93c89c1 SB |
1148 | switch (dev_replace->replace_state) { |
1149 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1150 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1151 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1152 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1153 | break; | |
1154 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1155 | dev_replace->replace_state = | |
1156 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
a944442c | 1157 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 | 1158 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 1159 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
1160 | break; |
1161 | } | |
1162 | ||
cb5583dd | 1163 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1164 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
1165 | } | |
1166 | ||
1167 | /* resume dev_replace procedure that was interrupted by unmount */ | |
1168 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
1169 | { | |
1170 | struct task_struct *task; | |
1171 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
1172 | ||
cb5583dd DS |
1173 | down_write(&dev_replace->rwsem); |
1174 | ||
e93c89c1 SB |
1175 | switch (dev_replace->replace_state) { |
1176 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1177 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1178 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
cb5583dd | 1179 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1180 | return 0; |
1181 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1182 | break; | |
1183 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1184 | dev_replace->replace_state = | |
1185 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
1186 | break; | |
1187 | } | |
1188 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 | 1189 | btrfs_info(fs_info, |
5d163e0e JM |
1190 | "cannot continue dev_replace, tgtdev is missing"); |
1191 | btrfs_info(fs_info, | |
1192 | "you may cancel the operation after 'mount -o degraded'"); | |
0d228ece AJ |
1193 | dev_replace->replace_state = |
1194 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 1195 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1196 | return 0; |
1197 | } | |
cb5583dd | 1198 | up_write(&dev_replace->rwsem); |
e93c89c1 | 1199 | |
010a47bd DS |
1200 | /* |
1201 | * This could collide with a paused balance, but the exclusive op logic | |
1202 | * should never allow both to start and pause. We don't want to allow | |
1203 | * dev-replace to start anyway. | |
1204 | */ | |
c3e1f96c | 1205 | if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { |
cb5583dd | 1206 | down_write(&dev_replace->rwsem); |
05c49e6b AJ |
1207 | dev_replace->replace_state = |
1208 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 1209 | up_write(&dev_replace->rwsem); |
010a47bd DS |
1210 | btrfs_info(fs_info, |
1211 | "cannot resume dev-replace, other exclusive operation running"); | |
1212 | return 0; | |
1213 | } | |
1214 | ||
e93c89c1 | 1215 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
8c6ffba0 | 1216 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
1217 | } |
1218 | ||
1219 | static int btrfs_dev_replace_kthread(void *data) | |
1220 | { | |
1221 | struct btrfs_fs_info *fs_info = data; | |
1222 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
e93c89c1 | 1223 | u64 progress; |
00251a52 | 1224 | int ret; |
e93c89c1 | 1225 | |
f1b8a1e8 DS |
1226 | progress = btrfs_dev_replace_progress(fs_info); |
1227 | progress = div_u64(progress, 10); | |
1228 | btrfs_info_in_rcu(fs_info, | |
3c958bd2 AJ |
1229 | "continuing dev_replace from %s (devid %llu) to target %s @%u%%", |
1230 | btrfs_dev_name(dev_replace->srcdev), | |
f1b8a1e8 | 1231 | dev_replace->srcdev->devid, |
3c958bd2 | 1232 | btrfs_dev_name(dev_replace->tgtdev), |
f1b8a1e8 DS |
1233 | (unsigned int)progress); |
1234 | ||
e93c89c1 SB |
1235 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
1236 | dev_replace->committed_cursor_left, | |
7cc8e58d | 1237 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
1238 | &dev_replace->scrub_progress, 0, 1); |
1239 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
49365e69 | 1240 | WARN_ON(ret && ret != -ECANCELED); |
00251a52 | 1241 | |
c3e1f96c | 1242 | btrfs_exclop_finish(fs_info); |
e93c89c1 SB |
1243 | return 0; |
1244 | } | |
1245 | ||
e1f60a65 | 1246 | int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
e93c89c1 SB |
1247 | { |
1248 | if (!dev_replace->is_valid) | |
1249 | return 0; | |
1250 | ||
1251 | switch (dev_replace->replace_state) { | |
1252 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1253 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1254 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1255 | return 0; | |
1256 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1257 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1258 | /* | |
1259 | * return true even if tgtdev is missing (this is | |
1260 | * something that can happen if the dev_replace | |
1261 | * procedure is suspended by an umount and then | |
1262 | * the tgtdev is missing (or "btrfs dev scan") was | |
52042d8e | 1263 | * not called and the filesystem is remounted |
e93c89c1 SB |
1264 | * in degraded state. This does not stop the |
1265 | * dev_replace procedure. It needs to be canceled | |
bb7ab3b9 | 1266 | * manually if the cancellation is wanted. |
e93c89c1 SB |
1267 | */ |
1268 | break; | |
1269 | } | |
1270 | return 1; | |
1271 | } | |
1272 | ||
4245215d | 1273 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
c404e0dc | 1274 | { |
7f8d236a DS |
1275 | percpu_counter_sub(&fs_info->dev_replace.bio_counter, amount); |
1276 | cond_wake_up_nomb(&fs_info->dev_replace.replace_wait); | |
c404e0dc MX |
1277 | } |
1278 | ||
1279 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
1280 | { | |
09dd7a01 | 1281 | while (1) { |
7f8d236a | 1282 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
09dd7a01 ZL |
1283 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1284 | &fs_info->fs_state))) | |
1285 | break; | |
1286 | ||
c404e0dc | 1287 | btrfs_bio_counter_dec(fs_info); |
7f8d236a | 1288 | wait_event(fs_info->dev_replace.replace_wait, |
c404e0dc MX |
1289 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1290 | &fs_info->fs_state)); | |
c404e0dc | 1291 | } |
c404e0dc | 1292 | } |