1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) STRATO AG 2012. All rights reserved. |
4 | */ |
5 | |
6 | #include <linux/sched.h> |
7 | #include <linux/bio.h> |
8 | #include <linux/slab.h> |
9 | #include <linux/blkdev.h> |
10 | #include <linux/kthread.h> |
11 | #include <linux/math64.h> |
12 | #include "misc.h" |
13 | #include "ctree.h" |
14 | #include "disk-io.h" |
15 | #include "transaction.h" |
16 | #include "volumes.h" |
17 | #include "async-thread.h" |
18 | #include "dev-replace.h" |
19 | #include "sysfs.h" |
20 | #include "zoned.h" |
21 | #include "block-group.h" |
22 | #include "fs.h" |
23 | #include "accessors.h" |
24 | #include "scrub.h" |
25 | |
26 | /* |
27 | * Device replace overview |
28 | * |
29 | * [Objective] |
30 | * To copy all extents (both new and on-disk) from source device to target |
31 | * device, while still keeping the filesystem read-write. |
32 | * |
33 | * [Method] |
34 | * There are two main methods involved: |
35 | * |
36 | * - Write duplication |
37 | * |
38 | * All new writes will be written to both target and source devices, so even |
39 | * if replace gets canceled, sources device still contains up-to-date data. |
40 | * |
41 | * Location: handle_ops_on_dev_replace() from btrfs_map_block() |
42 | * Start: btrfs_dev_replace_start() |
43 | * End: btrfs_dev_replace_finishing() |
44 | * Content: Latest data/metadata |
45 | * |
46 | * - Copy existing extents |
47 | * |
48 | * This happens by re-using scrub facility, as scrub also iterates through |
49 | * existing extents from commit root. |
50 | * |
51 | * Location: scrub_write_block_to_dev_replace() from |
52 | * scrub_block_complete() |
53 | * Content: Data/meta from commit root. |
54 | * |
55 | * Due to the content difference, we need to avoid nocow write when dev-replace |
56 | * is happening. This is done by marking the block group read-only and waiting |
57 | * for NOCOW writes. |
58 | * |
59 | * After replace is done, the finishing part is done by swapping the target and |
60 | * source devices. |
61 | * |
62 | * Location: btrfs_dev_replace_update_device_in_mapping_tree() from |
63 | * btrfs_dev_replace_finishing() |
64 | */ |
65 | |
66 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
67 | int scrub_ret); |
68 | static int btrfs_dev_replace_kthread(void *data); |
69 | |
70 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) |
71 | { |
72 | struct btrfs_dev_lookup_args args = { .devid = BTRFS_DEV_REPLACE_DEVID }; |
73 | struct btrfs_key key; |
74 | struct btrfs_root *dev_root = fs_info->dev_root; |
75 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
76 | struct extent_buffer *eb; |
77 | int slot; |
78 | int ret = 0; |
79 | struct btrfs_path *path = NULL; |
80 | int item_size; |
81 | struct btrfs_dev_replace_item *ptr; |
82 | u64 src_devid; |
83 | |
84 | if (!dev_root) |
85 | return 0; |
86 | |
87 | path = btrfs_alloc_path(); |
88 | if (!path) { |
89 | ret = -ENOMEM; |
90 | goto out; |
91 | } |
92 | |
93 | key.objectid = 0; |
94 | key.type = BTRFS_DEV_REPLACE_KEY; |
95 | key.offset = 0; |
96 | ret = btrfs_search_slot(NULL, root: dev_root, key: &key, p: path, ins_len: 0, cow: 0); |
97 | if (ret) { |
98 | no_valid_dev_replace_entry_found: |
99 | /* |
100 | * We don't have a replace item or it's corrupted. If there is |
101 | * a replace target, fail the mount. |
102 | */ |
103 | if (btrfs_find_device(fs_devices: fs_info->fs_devices, args: &args)) { |
104 | btrfs_err(fs_info, |
105 | "found replace target device without a valid replace item" ); |
106 | ret = -EUCLEAN; |
107 | goto out; |
108 | } |
109 | ret = 0; |
110 | dev_replace->replace_state = |
111 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; |
112 | dev_replace->cont_reading_from_srcdev_mode = |
113 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; |
114 | dev_replace->time_started = 0; |
115 | dev_replace->time_stopped = 0; |
116 | atomic64_set(v: &dev_replace->num_write_errors, i: 0); |
117 | atomic64_set(v: &dev_replace->num_uncorrectable_read_errors, i: 0); |
118 | dev_replace->cursor_left = 0; |
119 | dev_replace->committed_cursor_left = 0; |
120 | dev_replace->cursor_left_last_write_of_item = 0; |
121 | dev_replace->cursor_right = 0; |
122 | dev_replace->srcdev = NULL; |
123 | dev_replace->tgtdev = NULL; |
124 | dev_replace->is_valid = 0; |
125 | dev_replace->item_needs_writeback = 0; |
126 | goto out; |
127 | } |
128 | slot = path->slots[0]; |
129 | eb = path->nodes[0]; |
130 | item_size = btrfs_item_size(eb, slot); |
131 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); |
132 | |
133 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { |
134 | btrfs_warn(fs_info, |
135 | "dev_replace entry found has unexpected size, ignore entry" ); |
136 | goto no_valid_dev_replace_entry_found; |
137 | } |
138 | |
139 | src_devid = btrfs_dev_replace_src_devid(eb, s: ptr); |
140 | dev_replace->cont_reading_from_srcdev_mode = |
141 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, s: ptr); |
142 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, s: ptr); |
143 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, s: ptr); |
144 | dev_replace->time_stopped = |
145 | btrfs_dev_replace_time_stopped(eb, s: ptr); |
146 | atomic64_set(v: &dev_replace->num_write_errors, |
147 | i: btrfs_dev_replace_num_write_errors(eb, s: ptr)); |
148 | atomic64_set(v: &dev_replace->num_uncorrectable_read_errors, |
149 | i: btrfs_dev_replace_num_uncorrectable_read_errors(eb, s: ptr)); |
150 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, s: ptr); |
151 | dev_replace->committed_cursor_left = dev_replace->cursor_left; |
152 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; |
153 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, s: ptr); |
154 | dev_replace->is_valid = 1; |
155 | |
156 | dev_replace->item_needs_writeback = 0; |
157 | switch (dev_replace->replace_state) { |
158 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
159 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
160 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
161 | /* |
162 | * We don't have an active replace item but if there is a |
163 | * replace target, fail the mount. |
164 | */ |
165 | if (btrfs_find_device(fs_devices: fs_info->fs_devices, args: &args)) { |
166 | btrfs_err(fs_info, |
167 | "replace without active item, run 'device scan --forget' on the target device" ); |
168 | ret = -EUCLEAN; |
169 | } else { |
170 | dev_replace->srcdev = NULL; |
171 | dev_replace->tgtdev = NULL; |
172 | } |
173 | break; |
174 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
175 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
176 | dev_replace->tgtdev = btrfs_find_device(fs_devices: fs_info->fs_devices, args: &args); |
177 | args.devid = src_devid; |
178 | dev_replace->srcdev = btrfs_find_device(fs_devices: fs_info->fs_devices, args: &args); |
179 | |
180 | /* |
181 | * allow 'btrfs dev replace_cancel' if src/tgt device is |
182 | * missing |
183 | */ |
184 | if (!dev_replace->srcdev && |
185 | !btrfs_test_opt(fs_info, DEGRADED)) { |
186 | ret = -EIO; |
187 | btrfs_warn(fs_info, |
188 | "cannot mount because device replace operation is ongoing and" ); |
189 | btrfs_warn(fs_info, |
190 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?" , |
191 | src_devid); |
192 | } |
193 | if (!dev_replace->tgtdev && |
194 | !btrfs_test_opt(fs_info, DEGRADED)) { |
195 | ret = -EIO; |
196 | btrfs_warn(fs_info, |
197 | "cannot mount because device replace operation is ongoing and" ); |
198 | btrfs_warn(fs_info, |
199 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?" , |
200 | BTRFS_DEV_REPLACE_DEVID); |
201 | } |
202 | if (dev_replace->tgtdev) { |
203 | if (dev_replace->srcdev) { |
204 | dev_replace->tgtdev->total_bytes = |
205 | dev_replace->srcdev->total_bytes; |
206 | dev_replace->tgtdev->disk_total_bytes = |
207 | dev_replace->srcdev->disk_total_bytes; |
208 | dev_replace->tgtdev->commit_total_bytes = |
209 | dev_replace->srcdev->commit_total_bytes; |
210 | dev_replace->tgtdev->bytes_used = |
211 | dev_replace->srcdev->bytes_used; |
212 | dev_replace->tgtdev->commit_bytes_used = |
213 | dev_replace->srcdev->commit_bytes_used; |
214 | } |
215 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, |
216 | addr: &dev_replace->tgtdev->dev_state); |
217 | |
218 | WARN_ON(fs_info->fs_devices->rw_devices == 0); |
219 | dev_replace->tgtdev->io_width = fs_info->sectorsize; |
220 | dev_replace->tgtdev->io_align = fs_info->sectorsize; |
221 | dev_replace->tgtdev->sector_size = fs_info->sectorsize; |
222 | dev_replace->tgtdev->fs_info = fs_info; |
223 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, |
224 | addr: &dev_replace->tgtdev->dev_state); |
225 | } |
226 | break; |
227 | } |
228 | |
229 | out: |
230 | btrfs_free_path(p: path); |
231 | return ret; |
232 | } |
233 | |
234 | /* |
235 | * Initialize a new device for device replace target from a given source dev |
236 | * and path. |
237 | * |
238 | * Return 0 and new device in @device_out, otherwise return < 0 |
239 | */ |
240 | static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, |
241 | const char *device_path, |
242 | struct btrfs_device *srcdev, |
243 | struct btrfs_device **device_out) |
244 | { |
245 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
246 | struct btrfs_device *device; |
247 | struct file *bdev_file; |
248 | struct block_device *bdev; |
249 | u64 devid = BTRFS_DEV_REPLACE_DEVID; |
250 | int ret = 0; |
251 | |
252 | *device_out = NULL; |
253 | if (srcdev->fs_devices->seeding) { |
254 | btrfs_err(fs_info, "the filesystem is a seed filesystem!" ); |
255 | return -EINVAL; |
256 | } |
257 | |
258 | bdev_file = bdev_file_open_by_path(path: device_path, BLK_OPEN_WRITE, |
259 | holder: fs_info->bdev_holder, NULL); |
260 | if (IS_ERR(ptr: bdev_file)) { |
261 | btrfs_err(fs_info, "target device %s is invalid!" , device_path); |
262 | return PTR_ERR(ptr: bdev_file); |
263 | } |
264 | bdev = file_bdev(bdev_file); |
265 | |
266 | if (!btrfs_check_device_zone_type(fs_info, bdev)) { |
267 | btrfs_err(fs_info, |
268 | "dev-replace: zoned type of target device mismatch with filesystem" ); |
269 | ret = -EINVAL; |
270 | goto error; |
271 | } |
272 | |
273 | sync_blockdev(bdev); |
274 | |
275 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
276 | if (device->bdev == bdev) { |
277 | btrfs_err(fs_info, |
278 | "target device is in the filesystem!" ); |
279 | ret = -EEXIST; |
280 | goto error; |
281 | } |
282 | } |
283 | |
284 | |
285 | if (bdev_nr_bytes(bdev) < btrfs_device_get_total_bytes(dev: srcdev)) { |
286 | btrfs_err(fs_info, |
287 | "target device is smaller than source device!" ); |
288 | ret = -EINVAL; |
289 | goto error; |
290 | } |
291 | |
292 | |
293 | device = btrfs_alloc_device(NULL, devid: &devid, NULL, path: device_path); |
294 | if (IS_ERR(ptr: device)) { |
295 | ret = PTR_ERR(ptr: device); |
296 | goto error; |
297 | } |
298 | |
299 | ret = lookup_bdev(pathname: device_path, dev: &device->devt); |
300 | if (ret) |
301 | goto error; |
302 | |
303 | set_bit(BTRFS_DEV_STATE_WRITEABLE, addr: &device->dev_state); |
304 | device->generation = 0; |
305 | device->io_width = fs_info->sectorsize; |
306 | device->io_align = fs_info->sectorsize; |
307 | device->sector_size = fs_info->sectorsize; |
308 | device->total_bytes = btrfs_device_get_total_bytes(dev: srcdev); |
309 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(dev: srcdev); |
310 | device->bytes_used = btrfs_device_get_bytes_used(dev: srcdev); |
311 | device->commit_total_bytes = srcdev->commit_total_bytes; |
312 | device->commit_bytes_used = device->bytes_used; |
313 | device->fs_info = fs_info; |
314 | device->bdev = bdev; |
315 | device->bdev_file = bdev_file; |
316 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, addr: &device->dev_state); |
317 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, addr: &device->dev_state); |
318 | device->dev_stats_valid = 1; |
319 | set_blocksize(bdev: device->bdev, BTRFS_BDEV_BLOCKSIZE); |
320 | device->fs_devices = fs_devices; |
321 | |
322 | ret = btrfs_get_dev_zone_info(device, populate_cache: false); |
323 | if (ret) |
324 | goto error; |
325 | |
326 | mutex_lock(&fs_devices->device_list_mutex); |
327 | list_add(new: &device->dev_list, head: &fs_devices->devices); |
328 | fs_devices->num_devices++; |
329 | fs_devices->open_devices++; |
330 | mutex_unlock(lock: &fs_devices->device_list_mutex); |
331 | |
332 | *device_out = device; |
333 | return 0; |
334 | |
335 | error: |
336 | fput(bdev_file); |
337 | return ret; |
338 | } |
339 | |
340 | /* |
341 | * called from commit_transaction. Writes changed device replace state to |
342 | * disk. |
343 | */ |
344 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans) |
345 | { |
346 | struct btrfs_fs_info *fs_info = trans->fs_info; |
347 | int ret; |
348 | struct btrfs_root *dev_root = fs_info->dev_root; |
349 | struct btrfs_path *path; |
350 | struct btrfs_key key; |
351 | struct extent_buffer *eb; |
352 | struct btrfs_dev_replace_item *ptr; |
353 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
354 | |
355 | down_read(sem: &dev_replace->rwsem); |
356 | if (!dev_replace->is_valid || |
357 | !dev_replace->item_needs_writeback) { |
358 | up_read(sem: &dev_replace->rwsem); |
359 | return 0; |
360 | } |
361 | up_read(sem: &dev_replace->rwsem); |
362 | |
363 | key.objectid = 0; |
364 | key.type = BTRFS_DEV_REPLACE_KEY; |
365 | key.offset = 0; |
366 | |
367 | path = btrfs_alloc_path(); |
368 | if (!path) { |
369 | ret = -ENOMEM; |
370 | goto out; |
371 | } |
372 | ret = btrfs_search_slot(trans, root: dev_root, key: &key, p: path, ins_len: -1, cow: 1); |
373 | if (ret < 0) { |
374 | btrfs_warn(fs_info, |
375 | "error %d while searching for dev_replace item!" , |
376 | ret); |
377 | goto out; |
378 | } |
379 | |
380 | if (ret == 0 && |
381 | btrfs_item_size(eb: path->nodes[0], slot: path->slots[0]) < sizeof(*ptr)) { |
382 | /* |
383 | * need to delete old one and insert a new one. |
384 | * Since no attempt is made to recover any old state, if the |
385 | * dev_replace state is 'running', the data on the target |
386 | * drive is lost. |
387 | * It would be possible to recover the state: just make sure |
388 | * that the beginning of the item is never changed and always |
389 | * contains all the essential information. Then read this |
390 | * minimal set of information and use it as a base for the |
391 | * new state. |
392 | */ |
393 | ret = btrfs_del_item(trans, root: dev_root, path); |
394 | if (ret != 0) { |
395 | btrfs_warn(fs_info, |
396 | "delete too small dev_replace item failed %d!" , |
397 | ret); |
398 | goto out; |
399 | } |
400 | ret = 1; |
401 | } |
402 | |
403 | if (ret == 1) { |
404 | /* need to insert a new item */ |
405 | btrfs_release_path(p: path); |
406 | ret = btrfs_insert_empty_item(trans, root: dev_root, path, |
407 | key: &key, data_size: sizeof(*ptr)); |
408 | if (ret < 0) { |
409 | btrfs_warn(fs_info, |
410 | "insert dev_replace item failed %d!" , ret); |
411 | goto out; |
412 | } |
413 | } |
414 | |
415 | eb = path->nodes[0]; |
416 | ptr = btrfs_item_ptr(eb, path->slots[0], |
417 | struct btrfs_dev_replace_item); |
418 | |
419 | down_write(sem: &dev_replace->rwsem); |
420 | if (dev_replace->srcdev) |
421 | btrfs_set_dev_replace_src_devid(eb, s: ptr, |
422 | val: dev_replace->srcdev->devid); |
423 | else |
424 | btrfs_set_dev_replace_src_devid(eb, s: ptr, val: (u64)-1); |
425 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, s: ptr, |
426 | val: dev_replace->cont_reading_from_srcdev_mode); |
427 | btrfs_set_dev_replace_replace_state(eb, s: ptr, |
428 | val: dev_replace->replace_state); |
429 | btrfs_set_dev_replace_time_started(eb, s: ptr, val: dev_replace->time_started); |
430 | btrfs_set_dev_replace_time_stopped(eb, s: ptr, val: dev_replace->time_stopped); |
431 | btrfs_set_dev_replace_num_write_errors(eb, s: ptr, |
432 | val: atomic64_read(v: &dev_replace->num_write_errors)); |
433 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, s: ptr, |
434 | val: atomic64_read(v: &dev_replace->num_uncorrectable_read_errors)); |
435 | dev_replace->cursor_left_last_write_of_item = |
436 | dev_replace->cursor_left; |
437 | btrfs_set_dev_replace_cursor_left(eb, s: ptr, |
438 | val: dev_replace->cursor_left_last_write_of_item); |
439 | btrfs_set_dev_replace_cursor_right(eb, s: ptr, |
440 | val: dev_replace->cursor_right); |
441 | dev_replace->item_needs_writeback = 0; |
442 | up_write(sem: &dev_replace->rwsem); |
443 | |
444 | btrfs_mark_buffer_dirty(trans, buf: eb); |
445 | |
446 | out: |
447 | btrfs_free_path(p: path); |
448 | |
449 | return ret; |
450 | } |
451 | |
452 | static int mark_block_group_to_copy(struct btrfs_fs_info *fs_info, |
453 | struct btrfs_device *src_dev) |
454 | { |
455 | struct btrfs_path *path; |
456 | struct btrfs_key key; |
457 | struct btrfs_key found_key; |
458 | struct btrfs_root *root = fs_info->dev_root; |
459 | struct btrfs_dev_extent *dev_extent = NULL; |
460 | struct btrfs_block_group *cache; |
461 | struct btrfs_trans_handle *trans; |
462 | int iter_ret = 0; |
463 | int ret = 0; |
464 | u64 chunk_offset; |
465 | |
466 | /* Do not use "to_copy" on non zoned filesystem for now */ |
467 | if (!btrfs_is_zoned(fs_info)) |
468 | return 0; |
469 | |
470 | mutex_lock(&fs_info->chunk_mutex); |
471 | |
472 | /* Ensure we don't have pending new block group */ |
473 | spin_lock(lock: &fs_info->trans_lock); |
474 | while (fs_info->running_transaction && |
475 | !list_empty(head: &fs_info->running_transaction->dev_update_list)) { |
476 | spin_unlock(lock: &fs_info->trans_lock); |
477 | mutex_unlock(lock: &fs_info->chunk_mutex); |
478 | trans = btrfs_attach_transaction(root); |
479 | if (IS_ERR(ptr: trans)) { |
480 | ret = PTR_ERR(ptr: trans); |
481 | mutex_lock(&fs_info->chunk_mutex); |
482 | if (ret == -ENOENT) { |
483 | spin_lock(lock: &fs_info->trans_lock); |
484 | continue; |
485 | } else { |
486 | goto unlock; |
487 | } |
488 | } |
489 | |
490 | ret = btrfs_commit_transaction(trans); |
491 | mutex_lock(&fs_info->chunk_mutex); |
492 | if (ret) |
493 | goto unlock; |
494 | |
495 | spin_lock(lock: &fs_info->trans_lock); |
496 | } |
497 | spin_unlock(lock: &fs_info->trans_lock); |
498 | |
499 | path = btrfs_alloc_path(); |
500 | if (!path) { |
501 | ret = -ENOMEM; |
502 | goto unlock; |
503 | } |
504 | |
505 | path->reada = READA_FORWARD; |
506 | path->search_commit_root = 1; |
507 | path->skip_locking = 1; |
508 | |
509 | key.objectid = src_dev->devid; |
510 | key.type = BTRFS_DEV_EXTENT_KEY; |
511 | key.offset = 0; |
512 | |
513 | btrfs_for_each_slot(root, &key, &found_key, path, iter_ret) { |
514 | struct extent_buffer *leaf = path->nodes[0]; |
515 | |
516 | if (found_key.objectid != src_dev->devid) |
517 | break; |
518 | |
519 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
520 | break; |
521 | |
522 | if (found_key.offset < key.offset) |
523 | break; |
524 | |
525 | dev_extent = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent); |
526 | |
527 | chunk_offset = btrfs_dev_extent_chunk_offset(eb: leaf, s: dev_extent); |
528 | |
529 | cache = btrfs_lookup_block_group(info: fs_info, bytenr: chunk_offset); |
530 | if (!cache) |
531 | continue; |
532 | |
533 | set_bit(nr: BLOCK_GROUP_FLAG_TO_COPY, addr: &cache->runtime_flags); |
534 | btrfs_put_block_group(cache); |
535 | } |
536 | if (iter_ret < 0) |
537 | ret = iter_ret; |
538 | |
539 | btrfs_free_path(p: path); |
540 | unlock: |
541 | mutex_unlock(lock: &fs_info->chunk_mutex); |
542 | |
543 | return ret; |
544 | } |
545 | |
546 | bool btrfs_finish_block_group_to_copy(struct btrfs_device *srcdev, |
547 | struct btrfs_block_group *cache, |
548 | u64 physical) |
549 | { |
550 | struct btrfs_fs_info *fs_info = cache->fs_info; |
551 | struct btrfs_chunk_map *map; |
552 | u64 chunk_offset = cache->start; |
553 | int num_extents, cur_extent; |
554 | int i; |
555 | |
556 | /* Do not use "to_copy" on non zoned filesystem for now */ |
557 | if (!btrfs_is_zoned(fs_info)) |
558 | return true; |
559 | |
560 | spin_lock(lock: &cache->lock); |
561 | if (test_bit(BLOCK_GROUP_FLAG_REMOVED, &cache->runtime_flags)) { |
562 | spin_unlock(lock: &cache->lock); |
563 | return true; |
564 | } |
565 | spin_unlock(lock: &cache->lock); |
566 | |
567 | map = btrfs_get_chunk_map(fs_info, logical: chunk_offset, length: 1); |
568 | ASSERT(!IS_ERR(map)); |
569 | |
570 | num_extents = 0; |
571 | cur_extent = 0; |
572 | for (i = 0; i < map->num_stripes; i++) { |
573 | /* We have more device extent to copy */ |
574 | if (srcdev != map->stripes[i].dev) |
575 | continue; |
576 | |
577 | num_extents++; |
578 | if (physical == map->stripes[i].physical) |
579 | cur_extent = i; |
580 | } |
581 | |
582 | btrfs_free_chunk_map(map); |
583 | |
584 | if (num_extents > 1 && cur_extent < num_extents - 1) { |
585 | /* |
586 | * Has more stripes on this device. Keep this block group |
587 | * readonly until we finish all the stripes. |
588 | */ |
589 | return false; |
590 | } |
591 | |
592 | /* Last stripe on this device */ |
593 | clear_bit(nr: BLOCK_GROUP_FLAG_TO_COPY, addr: &cache->runtime_flags); |
594 | |
595 | return true; |
596 | } |
597 | |
598 | static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
599 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, |
600 | int read_src) |
601 | { |
602 | struct btrfs_root *root = fs_info->dev_root; |
603 | struct btrfs_trans_handle *trans; |
604 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
605 | int ret; |
606 | struct btrfs_device *tgt_device = NULL; |
607 | struct btrfs_device *src_device = NULL; |
608 | |
609 | src_device = btrfs_find_device_by_devspec(fs_info, devid: srcdevid, |
610 | devpath: srcdev_name); |
611 | if (IS_ERR(ptr: src_device)) |
612 | return PTR_ERR(ptr: src_device); |
613 | |
614 | if (btrfs_pinned_by_swapfile(fs_info, ptr: src_device)) { |
615 | btrfs_warn_in_rcu(fs_info, |
616 | "cannot replace device %s (devid %llu) due to active swapfile" , |
617 | btrfs_dev_name(src_device), src_device->devid); |
618 | return -ETXTBSY; |
619 | } |
620 | |
621 | /* |
622 | * Here we commit the transaction to make sure commit_total_bytes |
623 | * of all the devices are updated. |
624 | */ |
625 | trans = btrfs_attach_transaction(root); |
626 | if (!IS_ERR(ptr: trans)) { |
627 | ret = btrfs_commit_transaction(trans); |
628 | if (ret) |
629 | return ret; |
630 | } else if (PTR_ERR(ptr: trans) != -ENOENT) { |
631 | return PTR_ERR(ptr: trans); |
632 | } |
633 | |
634 | ret = btrfs_init_dev_replace_tgtdev(fs_info, device_path: tgtdev_name, |
635 | srcdev: src_device, device_out: &tgt_device); |
636 | if (ret) |
637 | return ret; |
638 | |
639 | ret = mark_block_group_to_copy(fs_info, src_dev: src_device); |
640 | if (ret) |
641 | return ret; |
642 | |
643 | down_write(sem: &dev_replace->rwsem); |
644 | switch (dev_replace->replace_state) { |
645 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
646 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
647 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
648 | break; |
649 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
650 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
651 | ASSERT(0); |
652 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
653 | up_write(sem: &dev_replace->rwsem); |
654 | goto leave; |
655 | } |
656 | |
657 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
658 | dev_replace->srcdev = src_device; |
659 | dev_replace->tgtdev = tgt_device; |
660 | |
661 | btrfs_info_in_rcu(fs_info, |
662 | "dev_replace from %s (devid %llu) to %s started" , |
663 | btrfs_dev_name(src_device), |
664 | src_device->devid, |
665 | btrfs_dev_name(tgt_device)); |
666 | |
667 | /* |
668 | * from now on, the writes to the srcdev are all duplicated to |
669 | * go to the tgtdev as well (refer to btrfs_map_block()). |
670 | */ |
671 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
672 | dev_replace->time_started = ktime_get_real_seconds(); |
673 | dev_replace->cursor_left = 0; |
674 | dev_replace->committed_cursor_left = 0; |
675 | dev_replace->cursor_left_last_write_of_item = 0; |
676 | dev_replace->cursor_right = 0; |
677 | dev_replace->is_valid = 1; |
678 | dev_replace->item_needs_writeback = 1; |
679 | atomic64_set(v: &dev_replace->num_write_errors, i: 0); |
680 | atomic64_set(v: &dev_replace->num_uncorrectable_read_errors, i: 0); |
681 | up_write(sem: &dev_replace->rwsem); |
682 | |
683 | ret = btrfs_sysfs_add_device(device: tgt_device); |
684 | if (ret) |
685 | btrfs_err(fs_info, "kobj add dev failed %d" , ret); |
686 | |
687 | btrfs_wait_ordered_roots(fs_info, U64_MAX, range_start: 0, range_len: (u64)-1); |
688 | |
689 | /* |
690 | * Commit dev_replace state and reserve 1 item for it. |
691 | * This is crucial to ensure we won't miss copying extents for new block |
692 | * groups that are allocated after we started the device replace, and |
693 | * must be done after setting up the device replace state. |
694 | */ |
695 | trans = btrfs_start_transaction(root, num_items: 1); |
696 | if (IS_ERR(ptr: trans)) { |
697 | ret = PTR_ERR(ptr: trans); |
698 | down_write(sem: &dev_replace->rwsem); |
699 | dev_replace->replace_state = |
700 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; |
701 | dev_replace->srcdev = NULL; |
702 | dev_replace->tgtdev = NULL; |
703 | up_write(sem: &dev_replace->rwsem); |
704 | goto leave; |
705 | } |
706 | |
707 | ret = btrfs_commit_transaction(trans); |
708 | WARN_ON(ret); |
709 | |
710 | /* the disk copy procedure reuses the scrub code */ |
711 | ret = btrfs_scrub_dev(fs_info, devid: src_device->devid, start: 0, |
712 | end: btrfs_device_get_total_bytes(dev: src_device), |
713 | progress: &dev_replace->scrub_progress, readonly: 0, is_dev_replace: 1); |
714 | |
715 | ret = btrfs_dev_replace_finishing(fs_info, scrub_ret: ret); |
716 | if (ret == -EINPROGRESS) |
717 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
718 | |
719 | return ret; |
720 | |
721 | leave: |
722 | btrfs_destroy_dev_replace_tgtdev(tgtdev: tgt_device); |
723 | return ret; |
724 | } |
725 | |
726 | static int btrfs_check_replace_dev_names(struct btrfs_ioctl_dev_replace_args *args) |
727 | { |
728 | if (args->start.srcdevid == 0) { |
729 | if (memchr(p: args->start.srcdev_name, c: 0, |
730 | size: sizeof(args->start.srcdev_name)) == NULL) |
731 | return -ENAMETOOLONG; |
732 | } else { |
733 | args->start.srcdev_name[0] = 0; |
734 | } |
735 | |
736 | if (memchr(p: args->start.tgtdev_name, c: 0, |
737 | size: sizeof(args->start.tgtdev_name)) == NULL) |
738 | return -ENAMETOOLONG; |
739 | |
740 | return 0; |
741 | } |
742 | |
743 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
744 | struct btrfs_ioctl_dev_replace_args *args) |
745 | { |
746 | int ret; |
747 | |
748 | switch (args->start.cont_reading_from_srcdev_mode) { |
749 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: |
750 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: |
751 | break; |
752 | default: |
753 | return -EINVAL; |
754 | } |
755 | ret = btrfs_check_replace_dev_names(args); |
756 | if (ret < 0) |
757 | return ret; |
758 | |
759 | ret = btrfs_dev_replace_start(fs_info, tgtdev_name: args->start.tgtdev_name, |
760 | srcdevid: args->start.srcdevid, |
761 | srcdev_name: args->start.srcdev_name, |
762 | read_src: args->start.cont_reading_from_srcdev_mode); |
763 | args->result = ret; |
764 | /* don't warn if EINPROGRESS, someone else might be running scrub */ |
765 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS || |
766 | ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) |
767 | return 0; |
768 | |
769 | return ret; |
770 | } |
771 | |
772 | /* |
773 | * blocked until all in-flight bios operations are finished. |
774 | */ |
775 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) |
776 | { |
777 | set_bit(nr: BTRFS_FS_STATE_DEV_REPLACING, addr: &fs_info->fs_state); |
778 | wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum( |
779 | &fs_info->dev_replace.bio_counter)); |
780 | } |
781 | |
782 | /* |
783 | * we have removed target device, it is safe to allow new bios request. |
784 | */ |
785 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) |
786 | { |
787 | clear_bit(nr: BTRFS_FS_STATE_DEV_REPLACING, addr: &fs_info->fs_state); |
788 | wake_up(&fs_info->dev_replace.replace_wait); |
789 | } |
790 | |
791 | /* |
792 | * When finishing the device replace, before swapping the source device with the |
793 | * target device we must update the chunk allocation state in the target device, |
794 | * as it is empty because replace works by directly copying the chunks and not |
795 | * through the normal chunk allocation path. |
796 | */ |
797 | static int btrfs_set_target_alloc_state(struct btrfs_device *srcdev, |
798 | struct btrfs_device *tgtdev) |
799 | { |
800 | struct extent_state *cached_state = NULL; |
801 | u64 start = 0; |
802 | u64 found_start; |
803 | u64 found_end; |
804 | int ret = 0; |
805 | |
806 | lockdep_assert_held(&srcdev->fs_info->chunk_mutex); |
807 | |
808 | while (find_first_extent_bit(tree: &srcdev->alloc_state, start, |
809 | start_ret: &found_start, end_ret: &found_end, |
810 | CHUNK_ALLOCATED, cached_state: &cached_state)) { |
811 | ret = set_extent_bit(tree: &tgtdev->alloc_state, start: found_start, |
812 | end: found_end, CHUNK_ALLOCATED, NULL); |
813 | if (ret) |
814 | break; |
815 | start = found_end + 1; |
816 | } |
817 | |
818 | free_extent_state(state: cached_state); |
819 | return ret; |
820 | } |
821 | |
822 | static void btrfs_dev_replace_update_device_in_mapping_tree( |
823 | struct btrfs_fs_info *fs_info, |
824 | struct btrfs_device *srcdev, |
825 | struct btrfs_device *tgtdev) |
826 | { |
827 | u64 start = 0; |
828 | int i; |
829 | |
830 | write_lock(&fs_info->mapping_tree_lock); |
831 | do { |
832 | struct btrfs_chunk_map *map; |
833 | |
834 | map = btrfs_find_chunk_map_nolock(fs_info, logical: start, U64_MAX); |
835 | if (!map) |
836 | break; |
837 | for (i = 0; i < map->num_stripes; i++) |
838 | if (srcdev == map->stripes[i].dev) |
839 | map->stripes[i].dev = tgtdev; |
840 | start = map->start + map->chunk_len; |
841 | btrfs_free_chunk_map(map); |
842 | } while (start); |
843 | write_unlock(&fs_info->mapping_tree_lock); |
844 | } |
845 | |
846 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
847 | int scrub_ret) |
848 | { |
849 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
850 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
851 | struct btrfs_device *tgt_device; |
852 | struct btrfs_device *src_device; |
853 | struct btrfs_root *root = fs_info->tree_root; |
854 | u8 uuid_tmp[BTRFS_UUID_SIZE]; |
855 | struct btrfs_trans_handle *trans; |
856 | int ret = 0; |
857 | |
858 | /* don't allow cancel or unmount to disturb the finishing procedure */ |
859 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
860 | |
861 | down_read(sem: &dev_replace->rwsem); |
862 | /* was the operation canceled, or is it finished? */ |
863 | if (dev_replace->replace_state != |
864 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { |
865 | up_read(sem: &dev_replace->rwsem); |
866 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
867 | return 0; |
868 | } |
869 | |
870 | tgt_device = dev_replace->tgtdev; |
871 | src_device = dev_replace->srcdev; |
872 | up_read(sem: &dev_replace->rwsem); |
873 | |
874 | /* |
875 | * flush all outstanding I/O and inode extent mappings before the |
876 | * copy operation is declared as being finished |
877 | */ |
878 | ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, in_reclaim_context: false); |
879 | if (ret) { |
880 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
881 | return ret; |
882 | } |
883 | btrfs_wait_ordered_roots(fs_info, U64_MAX, range_start: 0, range_len: (u64)-1); |
884 | |
885 | /* |
886 | * We have to use this loop approach because at this point src_device |
887 | * has to be available for transaction commit to complete, yet new |
888 | * chunks shouldn't be allocated on the device. |
889 | */ |
890 | while (1) { |
891 | trans = btrfs_start_transaction(root, num_items: 0); |
892 | if (IS_ERR(ptr: trans)) { |
893 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
894 | return PTR_ERR(ptr: trans); |
895 | } |
896 | ret = btrfs_commit_transaction(trans); |
897 | WARN_ON(ret); |
898 | |
899 | /* Prevent write_all_supers() during the finishing procedure */ |
900 | mutex_lock(&fs_devices->device_list_mutex); |
901 | /* Prevent new chunks being allocated on the source device */ |
902 | mutex_lock(&fs_info->chunk_mutex); |
903 | |
904 | if (!list_empty(head: &src_device->post_commit_list)) { |
905 | mutex_unlock(lock: &fs_devices->device_list_mutex); |
906 | mutex_unlock(lock: &fs_info->chunk_mutex); |
907 | } else { |
908 | break; |
909 | } |
910 | } |
911 | |
912 | down_write(sem: &dev_replace->rwsem); |
913 | dev_replace->replace_state = |
914 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED |
915 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; |
916 | dev_replace->tgtdev = NULL; |
917 | dev_replace->srcdev = NULL; |
918 | dev_replace->time_stopped = ktime_get_real_seconds(); |
919 | dev_replace->item_needs_writeback = 1; |
920 | |
921 | /* |
922 | * Update allocation state in the new device and replace the old device |
923 | * with the new one in the mapping tree. |
924 | */ |
925 | if (!scrub_ret) { |
926 | scrub_ret = btrfs_set_target_alloc_state(srcdev: src_device, tgtdev: tgt_device); |
927 | if (scrub_ret) |
928 | goto error; |
929 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
930 | srcdev: src_device, |
931 | tgtdev: tgt_device); |
932 | } else { |
933 | if (scrub_ret != -ECANCELED) |
934 | btrfs_err_in_rcu(fs_info, |
935 | "btrfs_scrub_dev(%s, %llu, %s) failed %d" , |
936 | btrfs_dev_name(src_device), |
937 | src_device->devid, |
938 | btrfs_dev_name(tgt_device), scrub_ret); |
939 | error: |
940 | up_write(sem: &dev_replace->rwsem); |
941 | mutex_unlock(lock: &fs_info->chunk_mutex); |
942 | mutex_unlock(lock: &fs_devices->device_list_mutex); |
943 | btrfs_rm_dev_replace_blocked(fs_info); |
944 | if (tgt_device) |
945 | btrfs_destroy_dev_replace_tgtdev(tgtdev: tgt_device); |
946 | btrfs_rm_dev_replace_unblocked(fs_info); |
947 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
948 | |
949 | return scrub_ret; |
950 | } |
951 | |
952 | btrfs_info_in_rcu(fs_info, |
953 | "dev_replace from %s (devid %llu) to %s finished" , |
954 | btrfs_dev_name(src_device), |
955 | src_device->devid, |
956 | btrfs_dev_name(tgt_device)); |
957 | clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, addr: &tgt_device->dev_state); |
958 | tgt_device->devid = src_device->devid; |
959 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; |
960 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
961 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); |
962 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); |
963 | btrfs_device_set_total_bytes(dev: tgt_device, size: src_device->total_bytes); |
964 | btrfs_device_set_disk_total_bytes(dev: tgt_device, |
965 | size: src_device->disk_total_bytes); |
966 | btrfs_device_set_bytes_used(dev: tgt_device, size: src_device->bytes_used); |
967 | tgt_device->commit_bytes_used = src_device->bytes_used; |
968 | |
969 | btrfs_assign_next_active_device(device: src_device, this_dev: tgt_device); |
970 | |
971 | list_add(new: &tgt_device->dev_alloc_list, head: &fs_devices->alloc_list); |
972 | fs_devices->rw_devices++; |
973 | |
974 | up_write(sem: &dev_replace->rwsem); |
975 | btrfs_rm_dev_replace_blocked(fs_info); |
976 | |
977 | btrfs_rm_dev_replace_remove_srcdev(srcdev: src_device); |
978 | |
979 | btrfs_rm_dev_replace_unblocked(fs_info); |
980 | |
981 | /* |
982 | * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will |
983 | * update on-disk dev stats value during commit transaction |
984 | */ |
985 | atomic_inc(v: &tgt_device->dev_stats_ccnt); |
986 | |
987 | /* |
988 | * this is again a consistent state where no dev_replace procedure |
989 | * is running, the target device is part of the filesystem, the |
990 | * source device is not part of the filesystem anymore and its 1st |
991 | * superblock is scratched out so that it is no longer marked to |
992 | * belong to this filesystem. |
993 | */ |
994 | mutex_unlock(lock: &fs_info->chunk_mutex); |
995 | mutex_unlock(lock: &fs_devices->device_list_mutex); |
996 | |
997 | /* replace the sysfs entry */ |
998 | btrfs_sysfs_remove_device(device: src_device); |
999 | btrfs_sysfs_update_devid(device: tgt_device); |
1000 | if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state)) |
1001 | btrfs_scratch_superblocks(fs_info, device: src_device); |
1002 | |
1003 | /* write back the superblocks */ |
1004 | trans = btrfs_start_transaction(root, num_items: 0); |
1005 | if (!IS_ERR(ptr: trans)) |
1006 | btrfs_commit_transaction(trans); |
1007 | |
1008 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
1009 | |
1010 | btrfs_rm_dev_replace_free_srcdev(srcdev: src_device); |
1011 | |
1012 | return 0; |
1013 | } |
1014 | |
1015 | /* |
1016 | * Read progress of device replace status according to the state and last |
1017 | * stored position. The value format is the same as for |
1018 | * btrfs_dev_replace::progress_1000 |
1019 | */ |
1020 | static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info) |
1021 | { |
1022 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
1023 | u64 ret = 0; |
1024 | |
1025 | switch (dev_replace->replace_state) { |
1026 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
1027 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
1028 | ret = 0; |
1029 | break; |
1030 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
1031 | ret = 1000; |
1032 | break; |
1033 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
1034 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
1035 | ret = div64_u64(dividend: dev_replace->cursor_left, |
1036 | divisor: div_u64(dividend: btrfs_device_get_total_bytes( |
1037 | dev: dev_replace->srcdev), divisor: 1000)); |
1038 | break; |
1039 | } |
1040 | |
1041 | return ret; |
1042 | } |
1043 | |
1044 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
1045 | struct btrfs_ioctl_dev_replace_args *args) |
1046 | { |
1047 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
1048 | |
1049 | down_read(sem: &dev_replace->rwsem); |
1050 | /* even if !dev_replace_is_valid, the values are good enough for |
1051 | * the replace_status ioctl */ |
1052 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
1053 | args->status.replace_state = dev_replace->replace_state; |
1054 | args->status.time_started = dev_replace->time_started; |
1055 | args->status.time_stopped = dev_replace->time_stopped; |
1056 | args->status.num_write_errors = |
1057 | atomic64_read(v: &dev_replace->num_write_errors); |
1058 | args->status.num_uncorrectable_read_errors = |
1059 | atomic64_read(v: &dev_replace->num_uncorrectable_read_errors); |
1060 | args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); |
1061 | up_read(sem: &dev_replace->rwsem); |
1062 | } |
1063 | |
1064 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
1065 | { |
1066 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
1067 | struct btrfs_device *tgt_device = NULL; |
1068 | struct btrfs_device *src_device = NULL; |
1069 | struct btrfs_trans_handle *trans; |
1070 | struct btrfs_root *root = fs_info->tree_root; |
1071 | int result; |
1072 | int ret; |
1073 | |
1074 | if (sb_rdonly(sb: fs_info->sb)) |
1075 | return -EROFS; |
1076 | |
1077 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
1078 | down_write(sem: &dev_replace->rwsem); |
1079 | switch (dev_replace->replace_state) { |
1080 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
1081 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
1082 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
1083 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; |
1084 | up_write(sem: &dev_replace->rwsem); |
1085 | break; |
1086 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
1087 | tgt_device = dev_replace->tgtdev; |
1088 | src_device = dev_replace->srcdev; |
1089 | up_write(sem: &dev_replace->rwsem); |
1090 | ret = btrfs_scrub_cancel(info: fs_info); |
1091 | if (ret < 0) { |
1092 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; |
1093 | } else { |
1094 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
1095 | /* |
1096 | * btrfs_dev_replace_finishing() will handle the |
1097 | * cleanup part |
1098 | */ |
1099 | btrfs_info_in_rcu(fs_info, |
1100 | "dev_replace from %s (devid %llu) to %s canceled" , |
1101 | btrfs_dev_name(src_device), src_device->devid, |
1102 | btrfs_dev_name(tgt_device)); |
1103 | } |
1104 | break; |
1105 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
1106 | /* |
1107 | * Scrub doing the replace isn't running so we need to do the |
1108 | * cleanup step of btrfs_dev_replace_finishing() here |
1109 | */ |
1110 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
1111 | tgt_device = dev_replace->tgtdev; |
1112 | src_device = dev_replace->srcdev; |
1113 | dev_replace->tgtdev = NULL; |
1114 | dev_replace->srcdev = NULL; |
1115 | dev_replace->replace_state = |
1116 | BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; |
1117 | dev_replace->time_stopped = ktime_get_real_seconds(); |
1118 | dev_replace->item_needs_writeback = 1; |
1119 | |
1120 | up_write(sem: &dev_replace->rwsem); |
1121 | |
1122 | /* Scrub for replace must not be running in suspended state */ |
1123 | btrfs_scrub_cancel(info: fs_info); |
1124 | |
1125 | trans = btrfs_start_transaction(root, num_items: 0); |
1126 | if (IS_ERR(ptr: trans)) { |
1127 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
1128 | return PTR_ERR(ptr: trans); |
1129 | } |
1130 | ret = btrfs_commit_transaction(trans); |
1131 | WARN_ON(ret); |
1132 | |
1133 | btrfs_info_in_rcu(fs_info, |
1134 | "suspended dev_replace from %s (devid %llu) to %s canceled" , |
1135 | btrfs_dev_name(src_device), src_device->devid, |
1136 | btrfs_dev_name(tgt_device)); |
1137 | |
1138 | if (tgt_device) |
1139 | btrfs_destroy_dev_replace_tgtdev(tgtdev: tgt_device); |
1140 | break; |
1141 | default: |
1142 | up_write(sem: &dev_replace->rwsem); |
1143 | result = -EINVAL; |
1144 | } |
1145 | |
1146 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
1147 | return result; |
1148 | } |
1149 | |
1150 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) |
1151 | { |
1152 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
1153 | |
1154 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
1155 | down_write(sem: &dev_replace->rwsem); |
1156 | |
1157 | switch (dev_replace->replace_state) { |
1158 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
1159 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
1160 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
1161 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
1162 | break; |
1163 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
1164 | dev_replace->replace_state = |
1165 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; |
1166 | dev_replace->time_stopped = ktime_get_real_seconds(); |
1167 | dev_replace->item_needs_writeback = 1; |
1168 | btrfs_info(fs_info, "suspending dev_replace for unmount" ); |
1169 | break; |
1170 | } |
1171 | |
1172 | up_write(sem: &dev_replace->rwsem); |
1173 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
1174 | } |
1175 | |
1176 | /* resume dev_replace procedure that was interrupted by unmount */ |
1177 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) |
1178 | { |
1179 | struct task_struct *task; |
1180 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
1181 | |
1182 | down_write(sem: &dev_replace->rwsem); |
1183 | |
1184 | switch (dev_replace->replace_state) { |
1185 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
1186 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
1187 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
1188 | up_write(sem: &dev_replace->rwsem); |
1189 | return 0; |
1190 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
1191 | break; |
1192 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
1193 | dev_replace->replace_state = |
1194 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
1195 | break; |
1196 | } |
1197 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { |
1198 | btrfs_info(fs_info, |
1199 | "cannot continue dev_replace, tgtdev is missing" ); |
1200 | btrfs_info(fs_info, |
1201 | "you may cancel the operation after 'mount -o degraded'" ); |
1202 | dev_replace->replace_state = |
1203 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; |
1204 | up_write(sem: &dev_replace->rwsem); |
1205 | return 0; |
1206 | } |
1207 | up_write(sem: &dev_replace->rwsem); |
1208 | |
1209 | /* |
1210 | * This could collide with a paused balance, but the exclusive op logic |
1211 | * should never allow both to start and pause. We don't want to allow |
1212 | * dev-replace to start anyway. |
1213 | */ |
1214 | if (!btrfs_exclop_start(fs_info, type: BTRFS_EXCLOP_DEV_REPLACE)) { |
1215 | down_write(sem: &dev_replace->rwsem); |
1216 | dev_replace->replace_state = |
1217 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; |
1218 | up_write(sem: &dev_replace->rwsem); |
1219 | btrfs_info(fs_info, |
1220 | "cannot resume dev-replace, other exclusive operation running" ); |
1221 | return 0; |
1222 | } |
1223 | |
1224 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl" ); |
1225 | return PTR_ERR_OR_ZERO(ptr: task); |
1226 | } |
1227 | |
1228 | static int btrfs_dev_replace_kthread(void *data) |
1229 | { |
1230 | struct btrfs_fs_info *fs_info = data; |
1231 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
1232 | u64 progress; |
1233 | int ret; |
1234 | |
1235 | progress = btrfs_dev_replace_progress(fs_info); |
1236 | progress = div_u64(dividend: progress, divisor: 10); |
1237 | btrfs_info_in_rcu(fs_info, |
1238 | "continuing dev_replace from %s (devid %llu) to target %s @%u%%" , |
1239 | btrfs_dev_name(dev_replace->srcdev), |
1240 | dev_replace->srcdev->devid, |
1241 | btrfs_dev_name(dev_replace->tgtdev), |
1242 | (unsigned int)progress); |
1243 | |
1244 | ret = btrfs_scrub_dev(fs_info, devid: dev_replace->srcdev->devid, |
1245 | start: dev_replace->committed_cursor_left, |
1246 | end: btrfs_device_get_total_bytes(dev: dev_replace->srcdev), |
1247 | progress: &dev_replace->scrub_progress, readonly: 0, is_dev_replace: 1); |
1248 | ret = btrfs_dev_replace_finishing(fs_info, scrub_ret: ret); |
1249 | WARN_ON(ret && ret != -ECANCELED); |
1250 | |
1251 | btrfs_exclop_finish(fs_info); |
1252 | return 0; |
1253 | } |
1254 | |
1255 | int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
1256 | { |
1257 | if (!dev_replace->is_valid) |
1258 | return 0; |
1259 | |
1260 | switch (dev_replace->replace_state) { |
1261 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
1262 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
1263 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
1264 | return 0; |
1265 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
1266 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
1267 | /* |
1268 | * return true even if tgtdev is missing (this is |
1269 | * something that can happen if the dev_replace |
1270 | * procedure is suspended by an umount and then |
1271 | * the tgtdev is missing (or "btrfs dev scan") was |
1272 | * not called and the filesystem is remounted |
1273 | * in degraded state. This does not stop the |
1274 | * dev_replace procedure. It needs to be canceled |
1275 | * manually if the cancellation is wanted. |
1276 | */ |
1277 | break; |
1278 | } |
1279 | return 1; |
1280 | } |
1281 | |
1282 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
1283 | { |
1284 | percpu_counter_sub(fbc: &fs_info->dev_replace.bio_counter, amount); |
1285 | cond_wake_up_nomb(wq: &fs_info->dev_replace.replace_wait); |
1286 | } |
1287 | |
1288 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) |
1289 | { |
1290 | while (1) { |
1291 | percpu_counter_inc(fbc: &fs_info->dev_replace.bio_counter); |
1292 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1293 | &fs_info->fs_state))) |
1294 | break; |
1295 | |
1296 | btrfs_bio_counter_dec(fs_info); |
1297 | wait_event(fs_info->dev_replace.replace_wait, |
1298 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1299 | &fs_info->fs_state)); |
1300 | } |
1301 | } |
1302 | |