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 "extent_map.h" |
15 | #include "disk-io.h" |
16 | #include "transaction.h" |
17 | #include "print-tree.h" |
18 | #include "volumes.h" |
19 | #include "async-thread.h" |
20 | #include "dev-replace.h" |
21 | #include "sysfs.h" |
22 | #include "zoned.h" |
23 | #include "block-group.h" |
24 | #include "fs.h" |
25 | #include "accessors.h" |
26 | #include "scrub.h" |
27 | |
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 |
41 | * if replace gets canceled, sources device still contains up-to-date data. |
42 | * |
43 | * Location: handle_ops_on_dev_replace() from btrfs_map_block() |
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 | |
68 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
69 | int scrub_ret); |
70 | static int btrfs_dev_replace_kthread(void *data); |
71 | |
72 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) |
73 | { |
74 | struct btrfs_dev_lookup_args args = { .devid = BTRFS_DEV_REPLACE_DEVID }; |
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 | |
86 | if (!dev_root) |
87 | return 0; |
88 | |
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, root: dev_root, key: &key, p: path, ins_len: 0, cow: 0); |
99 | if (ret) { |
100 | no_valid_dev_replace_entry_found: |
101 | /* |
102 | * We don't have a replace item or it's corrupted. If there is |
103 | * a replace target, fail the mount. |
104 | */ |
105 | if (btrfs_find_device(fs_devices: fs_info->fs_devices, args: &args)) { |
106 | btrfs_err(fs_info, |
107 | "found replace target device without a valid replace item" ); |
108 | ret = -EUCLEAN; |
109 | goto out; |
110 | } |
111 | ret = 0; |
112 | dev_replace->replace_state = |
113 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; |
114 | dev_replace->cont_reading_from_srcdev_mode = |
115 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; |
116 | dev_replace->time_started = 0; |
117 | dev_replace->time_stopped = 0; |
118 | atomic64_set(v: &dev_replace->num_write_errors, i: 0); |
119 | atomic64_set(v: &dev_replace->num_uncorrectable_read_errors, i: 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]; |
132 | item_size = btrfs_item_size(eb, slot); |
133 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); |
134 | |
135 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { |
136 | btrfs_warn(fs_info, |
137 | "dev_replace entry found has unexpected size, ignore entry" ); |
138 | goto no_valid_dev_replace_entry_found; |
139 | } |
140 | |
141 | src_devid = btrfs_dev_replace_src_devid(eb, s: ptr); |
142 | dev_replace->cont_reading_from_srcdev_mode = |
143 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, s: ptr); |
144 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, s: ptr); |
145 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, s: ptr); |
146 | dev_replace->time_stopped = |
147 | btrfs_dev_replace_time_stopped(eb, s: ptr); |
148 | atomic64_set(v: &dev_replace->num_write_errors, |
149 | i: btrfs_dev_replace_num_write_errors(eb, s: ptr)); |
150 | atomic64_set(v: &dev_replace->num_uncorrectable_read_errors, |
151 | i: btrfs_dev_replace_num_uncorrectable_read_errors(eb, s: ptr)); |
152 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, s: 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, s: 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: |
163 | /* |
164 | * We don't have an active replace item but if there is a |
165 | * replace target, fail the mount. |
166 | */ |
167 | if (btrfs_find_device(fs_devices: fs_info->fs_devices, args: &args)) { |
168 | btrfs_err(fs_info, |
169 | "replace without active item, run 'device scan --forget' on the target device" ); |
170 | ret = -EUCLEAN; |
171 | } else { |
172 | dev_replace->srcdev = NULL; |
173 | dev_replace->tgtdev = NULL; |
174 | } |
175 | break; |
176 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
177 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
178 | dev_replace->tgtdev = btrfs_find_device(fs_devices: fs_info->fs_devices, args: &args); |
179 | args.devid = src_devid; |
180 | dev_replace->srcdev = btrfs_find_device(fs_devices: fs_info->fs_devices, args: &args); |
181 | |
182 | /* |
183 | * allow 'btrfs dev replace_cancel' if src/tgt device is |
184 | * missing |
185 | */ |
186 | if (!dev_replace->srcdev && |
187 | !btrfs_test_opt(fs_info, DEGRADED)) { |
188 | ret = -EIO; |
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); |
194 | } |
195 | if (!dev_replace->tgtdev && |
196 | !btrfs_test_opt(fs_info, DEGRADED)) { |
197 | ret = -EIO; |
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'?" , |
202 | BTRFS_DEV_REPLACE_DEVID); |
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; |
210 | dev_replace->tgtdev->commit_total_bytes = |
211 | dev_replace->srcdev->commit_total_bytes; |
212 | dev_replace->tgtdev->bytes_used = |
213 | dev_replace->srcdev->bytes_used; |
214 | dev_replace->tgtdev->commit_bytes_used = |
215 | dev_replace->srcdev->commit_bytes_used; |
216 | } |
217 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, |
218 | addr: &dev_replace->tgtdev->dev_state); |
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 | addr: &dev_replace->tgtdev->dev_state); |
227 | } |
228 | break; |
229 | } |
230 | |
231 | out: |
232 | btrfs_free_path(p: path); |
233 | return ret; |
234 | } |
235 | |
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 | { |
247 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
248 | struct btrfs_device *device; |
249 | struct bdev_handle *bdev_handle; |
250 | struct block_device *bdev; |
251 | u64 devid = BTRFS_DEV_REPLACE_DEVID; |
252 | int ret = 0; |
253 | |
254 | *device_out = NULL; |
255 | if (srcdev->fs_devices->seeding) { |
256 | btrfs_err(fs_info, "the filesystem is a seed filesystem!" ); |
257 | return -EINVAL; |
258 | } |
259 | |
260 | bdev_handle = bdev_open_by_path(path: device_path, BLK_OPEN_WRITE, |
261 | holder: fs_info->bdev_holder, NULL); |
262 | if (IS_ERR(ptr: bdev_handle)) { |
263 | btrfs_err(fs_info, "target device %s is invalid!" , device_path); |
264 | return PTR_ERR(ptr: bdev_handle); |
265 | } |
266 | bdev = bdev_handle->bdev; |
267 | |
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 | |
275 | sync_blockdev(bdev); |
276 | |
277 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
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 | |
287 | if (bdev_nr_bytes(bdev) < btrfs_device_get_total_bytes(dev: srcdev)) { |
288 | btrfs_err(fs_info, |
289 | "target device is smaller than source device!" ); |
290 | ret = -EINVAL; |
291 | goto error; |
292 | } |
293 | |
294 | |
295 | device = btrfs_alloc_device(NULL, devid: &devid, NULL, path: device_path); |
296 | if (IS_ERR(ptr: device)) { |
297 | ret = PTR_ERR(ptr: device); |
298 | goto error; |
299 | } |
300 | |
301 | ret = lookup_bdev(pathname: device_path, dev: &device->devt); |
302 | if (ret) |
303 | goto error; |
304 | |
305 | set_bit(BTRFS_DEV_STATE_WRITEABLE, addr: &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(dev: srcdev); |
311 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(dev: srcdev); |
312 | device->bytes_used = btrfs_device_get_bytes_used(dev: srcdev); |
313 | device->commit_total_bytes = srcdev->commit_total_bytes; |
314 | device->commit_bytes_used = device->bytes_used; |
315 | device->fs_info = fs_info; |
316 | device->bdev = bdev; |
317 | device->bdev_handle = bdev_handle; |
318 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, addr: &device->dev_state); |
319 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, addr: &device->dev_state); |
320 | device->dev_stats_valid = 1; |
321 | set_blocksize(bdev: device->bdev, BTRFS_BDEV_BLOCKSIZE); |
322 | device->fs_devices = fs_devices; |
323 | |
324 | ret = btrfs_get_dev_zone_info(device, populate_cache: false); |
325 | if (ret) |
326 | goto error; |
327 | |
328 | mutex_lock(&fs_devices->device_list_mutex); |
329 | list_add(new: &device->dev_list, head: &fs_devices->devices); |
330 | fs_devices->num_devices++; |
331 | fs_devices->open_devices++; |
332 | mutex_unlock(lock: &fs_devices->device_list_mutex); |
333 | |
334 | *device_out = device; |
335 | return 0; |
336 | |
337 | error: |
338 | bdev_release(handle: bdev_handle); |
339 | return ret; |
340 | } |
341 | |
342 | /* |
343 | * called from commit_transaction. Writes changed device replace state to |
344 | * disk. |
345 | */ |
346 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans) |
347 | { |
348 | struct btrfs_fs_info *fs_info = trans->fs_info; |
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 | |
357 | down_read(sem: &dev_replace->rwsem); |
358 | if (!dev_replace->is_valid || |
359 | !dev_replace->item_needs_writeback) { |
360 | up_read(sem: &dev_replace->rwsem); |
361 | return 0; |
362 | } |
363 | up_read(sem: &dev_replace->rwsem); |
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, root: dev_root, key: &key, p: path, ins_len: -1, cow: 1); |
375 | if (ret < 0) { |
376 | btrfs_warn(fs_info, |
377 | "error %d while searching for dev_replace item!" , |
378 | ret); |
379 | goto out; |
380 | } |
381 | |
382 | if (ret == 0 && |
383 | btrfs_item_size(eb: path->nodes[0], slot: path->slots[0]) < sizeof(*ptr)) { |
384 | /* |
385 | * need to delete old one and insert a new one. |
386 | * Since no attempt is made to recover any old state, if the |
387 | * dev_replace state is 'running', the data on the target |
388 | * drive is lost. |
389 | * It would be possible to recover the state: just make sure |
390 | * that the beginning of the item is never changed and always |
391 | * contains all the essential information. Then read this |
392 | * minimal set of information and use it as a base for the |
393 | * new state. |
394 | */ |
395 | ret = btrfs_del_item(trans, root: dev_root, path); |
396 | if (ret != 0) { |
397 | btrfs_warn(fs_info, |
398 | "delete too small dev_replace item failed %d!" , |
399 | ret); |
400 | goto out; |
401 | } |
402 | ret = 1; |
403 | } |
404 | |
405 | if (ret == 1) { |
406 | /* need to insert a new item */ |
407 | btrfs_release_path(p: path); |
408 | ret = btrfs_insert_empty_item(trans, root: dev_root, path, |
409 | key: &key, data_size: sizeof(*ptr)); |
410 | if (ret < 0) { |
411 | btrfs_warn(fs_info, |
412 | "insert dev_replace item failed %d!" , ret); |
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 | |
421 | down_write(sem: &dev_replace->rwsem); |
422 | if (dev_replace->srcdev) |
423 | btrfs_set_dev_replace_src_devid(eb, s: ptr, |
424 | val: dev_replace->srcdev->devid); |
425 | else |
426 | btrfs_set_dev_replace_src_devid(eb, s: ptr, val: (u64)-1); |
427 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, s: ptr, |
428 | val: dev_replace->cont_reading_from_srcdev_mode); |
429 | btrfs_set_dev_replace_replace_state(eb, s: ptr, |
430 | val: dev_replace->replace_state); |
431 | btrfs_set_dev_replace_time_started(eb, s: ptr, val: dev_replace->time_started); |
432 | btrfs_set_dev_replace_time_stopped(eb, s: ptr, val: dev_replace->time_stopped); |
433 | btrfs_set_dev_replace_num_write_errors(eb, s: ptr, |
434 | val: atomic64_read(v: &dev_replace->num_write_errors)); |
435 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, s: ptr, |
436 | val: atomic64_read(v: &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, s: ptr, |
440 | val: dev_replace->cursor_left_last_write_of_item); |
441 | btrfs_set_dev_replace_cursor_right(eb, s: ptr, |
442 | val: dev_replace->cursor_right); |
443 | dev_replace->item_needs_writeback = 0; |
444 | up_write(sem: &dev_replace->rwsem); |
445 | |
446 | btrfs_mark_buffer_dirty(trans, buf: eb); |
447 | |
448 | out: |
449 | btrfs_free_path(p: path); |
450 | |
451 | return ret; |
452 | } |
453 | |
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; |
464 | int iter_ret = 0; |
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(lock: &fs_info->trans_lock); |
476 | while (fs_info->running_transaction && |
477 | !list_empty(head: &fs_info->running_transaction->dev_update_list)) { |
478 | spin_unlock(lock: &fs_info->trans_lock); |
479 | mutex_unlock(lock: &fs_info->chunk_mutex); |
480 | trans = btrfs_attach_transaction(root); |
481 | if (IS_ERR(ptr: trans)) { |
482 | ret = PTR_ERR(ptr: trans); |
483 | mutex_lock(&fs_info->chunk_mutex); |
484 | if (ret == -ENOENT) { |
485 | spin_lock(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(lock: &fs_info->trans_lock); |
498 | } |
499 | spin_unlock(lock: &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 | |
515 | btrfs_for_each_slot(root, &key, &found_key, path, iter_ret) { |
516 | struct extent_buffer *leaf = path->nodes[0]; |
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 | |
527 | dev_extent = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent); |
528 | |
529 | chunk_offset = btrfs_dev_extent_chunk_offset(eb: leaf, s: dev_extent); |
530 | |
531 | cache = btrfs_lookup_block_group(info: fs_info, bytenr: chunk_offset); |
532 | if (!cache) |
533 | continue; |
534 | |
535 | set_bit(nr: BLOCK_GROUP_FLAG_TO_COPY, addr: &cache->runtime_flags); |
536 | btrfs_put_block_group(cache); |
537 | } |
538 | if (iter_ret < 0) |
539 | ret = iter_ret; |
540 | |
541 | btrfs_free_path(p: path); |
542 | unlock: |
543 | mutex_unlock(lock: &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(lock: &cache->lock); |
564 | if (test_bit(BLOCK_GROUP_FLAG_REMOVED, &cache->runtime_flags)) { |
565 | spin_unlock(lock: &cache->lock); |
566 | return true; |
567 | } |
568 | spin_unlock(lock: &cache->lock); |
569 | |
570 | em = btrfs_get_chunk_map(fs_info, logical: chunk_offset, length: 1); |
571 | ASSERT(!IS_ERR(em)); |
572 | map = em->map_lookup; |
573 | |
574 | num_extents = 0; |
575 | cur_extent = 0; |
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 */ |
597 | clear_bit(nr: BLOCK_GROUP_FLAG_TO_COPY, addr: &cache->runtime_flags); |
598 | |
599 | return true; |
600 | } |
601 | |
602 | static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
603 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, |
604 | int read_src) |
605 | { |
606 | struct btrfs_root *root = fs_info->dev_root; |
607 | struct btrfs_trans_handle *trans; |
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 | |
613 | src_device = btrfs_find_device_by_devspec(fs_info, devid: srcdevid, |
614 | devpath: srcdev_name); |
615 | if (IS_ERR(ptr: src_device)) |
616 | return PTR_ERR(ptr: src_device); |
617 | |
618 | if (btrfs_pinned_by_swapfile(fs_info, ptr: 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 | |
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(ptr: trans)) { |
631 | ret = btrfs_commit_transaction(trans); |
632 | if (ret) |
633 | return ret; |
634 | } else if (PTR_ERR(ptr: trans) != -ENOENT) { |
635 | return PTR_ERR(ptr: trans); |
636 | } |
637 | |
638 | ret = btrfs_init_dev_replace_tgtdev(fs_info, device_path: tgtdev_name, |
639 | srcdev: src_device, device_out: &tgt_device); |
640 | if (ret) |
641 | return ret; |
642 | |
643 | ret = mark_block_group_to_copy(fs_info, src_dev: src_device); |
644 | if (ret) |
645 | return ret; |
646 | |
647 | down_write(sem: &dev_replace->rwsem); |
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: |
655 | ASSERT(0); |
656 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
657 | up_write(sem: &dev_replace->rwsem); |
658 | goto leave; |
659 | } |
660 | |
661 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
662 | dev_replace->srcdev = src_device; |
663 | dev_replace->tgtdev = tgt_device; |
664 | |
665 | btrfs_info_in_rcu(fs_info, |
666 | "dev_replace from %s (devid %llu) to %s started" , |
667 | btrfs_dev_name(src_device), |
668 | src_device->devid, |
669 | btrfs_dev_name(tgt_device)); |
670 | |
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; |
676 | dev_replace->time_started = ktime_get_real_seconds(); |
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; |
683 | atomic64_set(v: &dev_replace->num_write_errors, i: 0); |
684 | atomic64_set(v: &dev_replace->num_uncorrectable_read_errors, i: 0); |
685 | up_write(sem: &dev_replace->rwsem); |
686 | |
687 | ret = btrfs_sysfs_add_device(device: tgt_device); |
688 | if (ret) |
689 | btrfs_err(fs_info, "kobj add dev failed %d" , ret); |
690 | |
691 | btrfs_wait_ordered_roots(fs_info, U64_MAX, range_start: 0, range_len: (u64)-1); |
692 | |
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 | */ |
699 | trans = btrfs_start_transaction(root, num_items: 1); |
700 | if (IS_ERR(ptr: trans)) { |
701 | ret = PTR_ERR(ptr: trans); |
702 | down_write(sem: &dev_replace->rwsem); |
703 | dev_replace->replace_state = |
704 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; |
705 | dev_replace->srcdev = NULL; |
706 | dev_replace->tgtdev = NULL; |
707 | up_write(sem: &dev_replace->rwsem); |
708 | goto leave; |
709 | } |
710 | |
711 | ret = btrfs_commit_transaction(trans); |
712 | WARN_ON(ret); |
713 | |
714 | /* the disk copy procedure reuses the scrub code */ |
715 | ret = btrfs_scrub_dev(fs_info, devid: src_device->devid, start: 0, |
716 | end: btrfs_device_get_total_bytes(dev: src_device), |
717 | progress: &dev_replace->scrub_progress, readonly: 0, is_dev_replace: 1); |
718 | |
719 | ret = btrfs_dev_replace_finishing(fs_info, scrub_ret: ret); |
720 | if (ret == -EINPROGRESS) |
721 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
722 | |
723 | return ret; |
724 | |
725 | leave: |
726 | btrfs_destroy_dev_replace_tgtdev(tgtdev: tgt_device); |
727 | return ret; |
728 | } |
729 | |
730 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
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 | |
747 | ret = btrfs_dev_replace_start(fs_info, tgtdev_name: args->start.tgtdev_name, |
748 | srcdevid: args->start.srcdevid, |
749 | srcdev_name: args->start.srcdev_name, |
750 | read_src: args->start.cont_reading_from_srcdev_mode); |
751 | args->result = ret; |
752 | /* don't warn if EINPROGRESS, someone else might be running scrub */ |
753 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS || |
754 | ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) |
755 | return 0; |
756 | |
757 | return ret; |
758 | } |
759 | |
760 | /* |
761 | * blocked until all in-flight bios operations are finished. |
762 | */ |
763 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) |
764 | { |
765 | set_bit(nr: BTRFS_FS_STATE_DEV_REPLACING, addr: &fs_info->fs_state); |
766 | wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum( |
767 | &fs_info->dev_replace.bio_counter)); |
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(nr: BTRFS_FS_STATE_DEV_REPLACING, addr: &fs_info->fs_state); |
776 | wake_up(&fs_info->dev_replace.replace_wait); |
777 | } |
778 | |
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 | |
796 | while (find_first_extent_bit(tree: &srcdev->alloc_state, start, |
797 | start_ret: &found_start, end_ret: &found_end, |
798 | CHUNK_ALLOCATED, cached_state: &cached_state)) { |
799 | ret = set_extent_bit(tree: &tgtdev->alloc_state, start: found_start, |
800 | end: found_end, CHUNK_ALLOCATED, NULL); |
801 | if (ret) |
802 | break; |
803 | start = found_end + 1; |
804 | } |
805 | |
806 | free_extent_state(state: cached_state); |
807 | return ret; |
808 | } |
809 | |
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(tree: em_tree, start, len: (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 | |
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; |
840 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
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 | |
851 | down_read(sem: &dev_replace->rwsem); |
852 | /* was the operation canceled, or is it finished? */ |
853 | if (dev_replace->replace_state != |
854 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { |
855 | up_read(sem: &dev_replace->rwsem); |
856 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
857 | return 0; |
858 | } |
859 | |
860 | tgt_device = dev_replace->tgtdev; |
861 | src_device = dev_replace->srcdev; |
862 | up_read(sem: &dev_replace->rwsem); |
863 | |
864 | /* |
865 | * flush all outstanding I/O and inode extent mappings before the |
866 | * copy operation is declared as being finished |
867 | */ |
868 | ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, in_reclaim_context: false); |
869 | if (ret) { |
870 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
871 | return ret; |
872 | } |
873 | btrfs_wait_ordered_roots(fs_info, U64_MAX, range_start: 0, range_len: (u64)-1); |
874 | |
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, num_items: 0); |
882 | if (IS_ERR(ptr: trans)) { |
883 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
884 | return PTR_ERR(ptr: trans); |
885 | } |
886 | ret = btrfs_commit_transaction(trans); |
887 | WARN_ON(ret); |
888 | |
889 | /* Prevent write_all_supers() during the finishing procedure */ |
890 | mutex_lock(&fs_devices->device_list_mutex); |
891 | /* Prevent new chunks being allocated on the source device */ |
892 | mutex_lock(&fs_info->chunk_mutex); |
893 | |
894 | if (!list_empty(head: &src_device->post_commit_list)) { |
895 | mutex_unlock(lock: &fs_devices->device_list_mutex); |
896 | mutex_unlock(lock: &fs_info->chunk_mutex); |
897 | } else { |
898 | break; |
899 | } |
900 | } |
901 | |
902 | down_write(sem: &dev_replace->rwsem); |
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; |
908 | dev_replace->time_stopped = ktime_get_real_seconds(); |
909 | dev_replace->item_needs_writeback = 1; |
910 | |
911 | /* |
912 | * Update allocation state in the new device and replace the old device |
913 | * with the new one in the mapping tree. |
914 | */ |
915 | if (!scrub_ret) { |
916 | scrub_ret = btrfs_set_target_alloc_state(srcdev: src_device, tgtdev: tgt_device); |
917 | if (scrub_ret) |
918 | goto error; |
919 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
920 | srcdev: src_device, |
921 | tgtdev: tgt_device); |
922 | } else { |
923 | if (scrub_ret != -ECANCELED) |
924 | btrfs_err_in_rcu(fs_info, |
925 | "btrfs_scrub_dev(%s, %llu, %s) failed %d" , |
926 | btrfs_dev_name(src_device), |
927 | src_device->devid, |
928 | btrfs_dev_name(tgt_device), scrub_ret); |
929 | error: |
930 | up_write(sem: &dev_replace->rwsem); |
931 | mutex_unlock(lock: &fs_info->chunk_mutex); |
932 | mutex_unlock(lock: &fs_devices->device_list_mutex); |
933 | btrfs_rm_dev_replace_blocked(fs_info); |
934 | if (tgt_device) |
935 | btrfs_destroy_dev_replace_tgtdev(tgtdev: tgt_device); |
936 | btrfs_rm_dev_replace_unblocked(fs_info); |
937 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
938 | |
939 | return scrub_ret; |
940 | } |
941 | |
942 | btrfs_info_in_rcu(fs_info, |
943 | "dev_replace from %s (devid %llu) to %s finished" , |
944 | btrfs_dev_name(src_device), |
945 | src_device->devid, |
946 | btrfs_dev_name(tgt_device)); |
947 | clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, addr: &tgt_device->dev_state); |
948 | tgt_device->devid = src_device->devid; |
949 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; |
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)); |
953 | btrfs_device_set_total_bytes(dev: tgt_device, size: src_device->total_bytes); |
954 | btrfs_device_set_disk_total_bytes(dev: tgt_device, |
955 | size: src_device->disk_total_bytes); |
956 | btrfs_device_set_bytes_used(dev: tgt_device, size: src_device->bytes_used); |
957 | tgt_device->commit_bytes_used = src_device->bytes_used; |
958 | |
959 | btrfs_assign_next_active_device(device: src_device, this_dev: tgt_device); |
960 | |
961 | list_add(new: &tgt_device->dev_alloc_list, head: &fs_devices->alloc_list); |
962 | fs_devices->rw_devices++; |
963 | |
964 | up_write(sem: &dev_replace->rwsem); |
965 | btrfs_rm_dev_replace_blocked(fs_info); |
966 | |
967 | btrfs_rm_dev_replace_remove_srcdev(srcdev: src_device); |
968 | |
969 | btrfs_rm_dev_replace_unblocked(fs_info); |
970 | |
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(v: &tgt_device->dev_stats_ccnt); |
976 | |
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 | */ |
984 | mutex_unlock(lock: &fs_info->chunk_mutex); |
985 | mutex_unlock(lock: &fs_devices->device_list_mutex); |
986 | |
987 | /* replace the sysfs entry */ |
988 | btrfs_sysfs_remove_device(device: src_device); |
989 | btrfs_sysfs_update_devid(device: tgt_device); |
990 | if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state)) |
991 | btrfs_scratch_superblocks(fs_info, bdev: src_device->bdev, |
992 | device_path: src_device->name->str); |
993 | |
994 | /* write back the superblocks */ |
995 | trans = btrfs_start_transaction(root, num_items: 0); |
996 | if (!IS_ERR(ptr: trans)) |
997 | btrfs_commit_transaction(trans); |
998 | |
999 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
1000 | |
1001 | btrfs_rm_dev_replace_free_srcdev(srcdev: src_device); |
1002 | |
1003 | return 0; |
1004 | } |
1005 | |
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(dividend: dev_replace->cursor_left, |
1027 | divisor: div_u64(dividend: btrfs_device_get_total_bytes( |
1028 | dev: dev_replace->srcdev), divisor: 1000)); |
1029 | break; |
1030 | } |
1031 | |
1032 | return ret; |
1033 | } |
1034 | |
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 | |
1040 | down_read(sem: &dev_replace->rwsem); |
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(v: &dev_replace->num_write_errors); |
1049 | args->status.num_uncorrectable_read_errors = |
1050 | atomic64_read(v: &dev_replace->num_uncorrectable_read_errors); |
1051 | args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); |
1052 | up_read(sem: &dev_replace->rwsem); |
1053 | } |
1054 | |
1055 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
1056 | { |
1057 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
1058 | struct btrfs_device *tgt_device = NULL; |
1059 | struct btrfs_device *src_device = NULL; |
1060 | struct btrfs_trans_handle *trans; |
1061 | struct btrfs_root *root = fs_info->tree_root; |
1062 | int result; |
1063 | int ret; |
1064 | |
1065 | if (sb_rdonly(sb: fs_info->sb)) |
1066 | return -EROFS; |
1067 | |
1068 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
1069 | down_write(sem: &dev_replace->rwsem); |
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; |
1075 | up_write(sem: &dev_replace->rwsem); |
1076 | break; |
1077 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
1078 | tgt_device = dev_replace->tgtdev; |
1079 | src_device = dev_replace->srcdev; |
1080 | up_write(sem: &dev_replace->rwsem); |
1081 | ret = btrfs_scrub_cancel(info: 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 | } |
1095 | break; |
1096 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
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 | */ |
1101 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
1102 | tgt_device = dev_replace->tgtdev; |
1103 | src_device = dev_replace->srcdev; |
1104 | dev_replace->tgtdev = NULL; |
1105 | dev_replace->srcdev = NULL; |
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; |
1110 | |
1111 | up_write(sem: &dev_replace->rwsem); |
1112 | |
1113 | /* Scrub for replace must not be running in suspended state */ |
1114 | btrfs_scrub_cancel(info: fs_info); |
1115 | |
1116 | trans = btrfs_start_transaction(root, num_items: 0); |
1117 | if (IS_ERR(ptr: trans)) { |
1118 | mutex_unlock(lock: &dev_replace->lock_finishing_cancel_unmount); |
1119 | return PTR_ERR(ptr: trans); |
1120 | } |
1121 | ret = btrfs_commit_transaction(trans); |
1122 | WARN_ON(ret); |
1123 | |
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(tgtdev: tgt_device); |
1131 | break; |
1132 | default: |
1133 | up_write(sem: &dev_replace->rwsem); |
1134 | result = -EINVAL; |
1135 | } |
1136 | |
1137 | mutex_unlock(lock: &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); |
1146 | down_write(sem: &dev_replace->rwsem); |
1147 | |
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; |
1157 | dev_replace->time_stopped = ktime_get_real_seconds(); |
1158 | dev_replace->item_needs_writeback = 1; |
1159 | btrfs_info(fs_info, "suspending dev_replace for unmount" ); |
1160 | break; |
1161 | } |
1162 | |
1163 | up_write(sem: &dev_replace->rwsem); |
1164 | mutex_unlock(lock: &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 | |
1173 | down_write(sem: &dev_replace->rwsem); |
1174 | |
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: |
1179 | up_write(sem: &dev_replace->rwsem); |
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) { |
1189 | btrfs_info(fs_info, |
1190 | "cannot continue dev_replace, tgtdev is missing" ); |
1191 | btrfs_info(fs_info, |
1192 | "you may cancel the operation after 'mount -o degraded'" ); |
1193 | dev_replace->replace_state = |
1194 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; |
1195 | up_write(sem: &dev_replace->rwsem); |
1196 | return 0; |
1197 | } |
1198 | up_write(sem: &dev_replace->rwsem); |
1199 | |
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 | */ |
1205 | if (!btrfs_exclop_start(fs_info, type: BTRFS_EXCLOP_DEV_REPLACE)) { |
1206 | down_write(sem: &dev_replace->rwsem); |
1207 | dev_replace->replace_state = |
1208 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; |
1209 | up_write(sem: &dev_replace->rwsem); |
1210 | btrfs_info(fs_info, |
1211 | "cannot resume dev-replace, other exclusive operation running" ); |
1212 | return 0; |
1213 | } |
1214 | |
1215 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl" ); |
1216 | return PTR_ERR_OR_ZERO(ptr: task); |
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; |
1223 | u64 progress; |
1224 | int ret; |
1225 | |
1226 | progress = btrfs_dev_replace_progress(fs_info); |
1227 | progress = div_u64(dividend: progress, divisor: 10); |
1228 | btrfs_info_in_rcu(fs_info, |
1229 | "continuing dev_replace from %s (devid %llu) to target %s @%u%%" , |
1230 | btrfs_dev_name(dev_replace->srcdev), |
1231 | dev_replace->srcdev->devid, |
1232 | btrfs_dev_name(dev_replace->tgtdev), |
1233 | (unsigned int)progress); |
1234 | |
1235 | ret = btrfs_scrub_dev(fs_info, devid: dev_replace->srcdev->devid, |
1236 | start: dev_replace->committed_cursor_left, |
1237 | end: btrfs_device_get_total_bytes(dev: dev_replace->srcdev), |
1238 | progress: &dev_replace->scrub_progress, readonly: 0, is_dev_replace: 1); |
1239 | ret = btrfs_dev_replace_finishing(fs_info, scrub_ret: ret); |
1240 | WARN_ON(ret && ret != -ECANCELED); |
1241 | |
1242 | btrfs_exclop_finish(fs_info); |
1243 | return 0; |
1244 | } |
1245 | |
1246 | int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
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 |
1263 | * not called and the filesystem is remounted |
1264 | * in degraded state. This does not stop the |
1265 | * dev_replace procedure. It needs to be canceled |
1266 | * manually if the cancellation is wanted. |
1267 | */ |
1268 | break; |
1269 | } |
1270 | return 1; |
1271 | } |
1272 | |
1273 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
1274 | { |
1275 | percpu_counter_sub(fbc: &fs_info->dev_replace.bio_counter, amount); |
1276 | cond_wake_up_nomb(wq: &fs_info->dev_replace.replace_wait); |
1277 | } |
1278 | |
1279 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) |
1280 | { |
1281 | while (1) { |
1282 | percpu_counter_inc(fbc: &fs_info->dev_replace.bio_counter); |
1283 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1284 | &fs_info->fs_state))) |
1285 | break; |
1286 | |
1287 | btrfs_bio_counter_dec(fs_info); |
1288 | wait_event(fs_info->dev_replace.replace_wait, |
1289 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1290 | &fs_info->fs_state)); |
1291 | } |
1292 | } |
1293 | |