Commit | Line | Data |
---|---|---|
c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e93c89c1 SB |
2 | /* |
3 | * Copyright (C) STRATO AG 2012. All rights reserved. | |
e93c89c1 | 4 | */ |
c1d7c514 | 5 | |
e93c89c1 SB |
6 | #include <linux/sched.h> |
7 | #include <linux/bio.h> | |
8 | #include <linux/slab.h> | |
e93c89c1 | 9 | #include <linux/blkdev.h> |
e93c89c1 SB |
10 | #include <linux/kthread.h> |
11 | #include <linux/math64.h> | |
602cbe91 | 12 | #include "misc.h" |
e93c89c1 SB |
13 | #include "ctree.h" |
14 | #include "extent_map.h" | |
15 | #include "disk-io.h" | |
16 | #include "transaction.h" | |
17 | #include "print-tree.h" | |
18 | #include "volumes.h" | |
19 | #include "async-thread.h" | |
20 | #include "check-integrity.h" | |
21 | #include "rcu-string.h" | |
22 | #include "dev-replace.h" | |
49c6f736 | 23 | #include "sysfs.h" |
e93c89c1 | 24 | |
30b3688e QW |
25 | /* |
26 | * Device replace overview | |
27 | * | |
28 | * [Objective] | |
29 | * To copy all extents (both new and on-disk) from source device to target | |
30 | * device, while still keeping the filesystem read-write. | |
31 | * | |
32 | * [Method] | |
33 | * There are two main methods involved: | |
34 | * | |
35 | * - Write duplication | |
36 | * | |
37 | * All new writes will be written to both target and source devices, so even | |
38 | * if replace gets canceled, sources device still contans up-to-date data. | |
39 | * | |
40 | * Location: handle_ops_on_dev_replace() from __btrfs_map_block() | |
41 | * Start: btrfs_dev_replace_start() | |
42 | * End: btrfs_dev_replace_finishing() | |
43 | * Content: Latest data/metadata | |
44 | * | |
45 | * - Copy existing extents | |
46 | * | |
47 | * This happens by re-using scrub facility, as scrub also iterates through | |
48 | * existing extents from commit root. | |
49 | * | |
50 | * Location: scrub_write_block_to_dev_replace() from | |
51 | * scrub_block_complete() | |
52 | * Content: Data/meta from commit root. | |
53 | * | |
54 | * Due to the content difference, we need to avoid nocow write when dev-replace | |
55 | * is happening. This is done by marking the block group read-only and waiting | |
56 | * for NOCOW writes. | |
57 | * | |
58 | * After replace is done, the finishing part is done by swapping the target and | |
59 | * source devices. | |
60 | * | |
61 | * Location: btrfs_dev_replace_update_device_in_mapping_tree() from | |
62 | * btrfs_dev_replace_finishing() | |
63 | */ | |
64 | ||
e93c89c1 SB |
65 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
66 | int scrub_ret); | |
67 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
68 | struct btrfs_fs_info *fs_info, | |
69 | struct btrfs_device *srcdev, | |
70 | struct btrfs_device *tgtdev); | |
e93c89c1 | 71 | static int btrfs_dev_replace_kthread(void *data); |
e93c89c1 SB |
72 | |
73 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
74 | { | |
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 | path = btrfs_alloc_path(); | |
87 | if (!path) { | |
88 | ret = -ENOMEM; | |
89 | goto out; | |
90 | } | |
91 | ||
92 | key.objectid = 0; | |
93 | key.type = BTRFS_DEV_REPLACE_KEY; | |
94 | key.offset = 0; | |
95 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
96 | if (ret) { | |
97 | no_valid_dev_replace_entry_found: | |
98 | ret = 0; | |
99 | dev_replace->replace_state = | |
27e022a9 | 100 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; |
e93c89c1 SB |
101 | dev_replace->cont_reading_from_srcdev_mode = |
102 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
e93c89c1 SB |
103 | dev_replace->time_started = 0; |
104 | dev_replace->time_stopped = 0; | |
105 | atomic64_set(&dev_replace->num_write_errors, 0); | |
106 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
107 | dev_replace->cursor_left = 0; | |
108 | dev_replace->committed_cursor_left = 0; | |
109 | dev_replace->cursor_left_last_write_of_item = 0; | |
110 | dev_replace->cursor_right = 0; | |
111 | dev_replace->srcdev = NULL; | |
112 | dev_replace->tgtdev = NULL; | |
113 | dev_replace->is_valid = 0; | |
114 | dev_replace->item_needs_writeback = 0; | |
115 | goto out; | |
116 | } | |
117 | slot = path->slots[0]; | |
118 | eb = path->nodes[0]; | |
119 | item_size = btrfs_item_size_nr(eb, slot); | |
120 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); | |
121 | ||
122 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
efe120a0 FH |
123 | btrfs_warn(fs_info, |
124 | "dev_replace entry found has unexpected size, ignore entry"); | |
e93c89c1 SB |
125 | goto no_valid_dev_replace_entry_found; |
126 | } | |
127 | ||
128 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
129 | dev_replace->cont_reading_from_srcdev_mode = | |
130 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
131 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
132 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
133 | dev_replace->time_stopped = | |
134 | btrfs_dev_replace_time_stopped(eb, ptr); | |
135 | atomic64_set(&dev_replace->num_write_errors, | |
136 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
137 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
138 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
139 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
140 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
141 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
142 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
143 | dev_replace->is_valid = 1; | |
144 | ||
145 | dev_replace->item_needs_writeback = 0; | |
146 | switch (dev_replace->replace_state) { | |
147 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
148 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
149 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
150 | dev_replace->srcdev = NULL; | |
151 | dev_replace->tgtdev = NULL; | |
152 | break; | |
153 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
154 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
e4319cd9 | 155 | dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices, |
09ba3bc9 | 156 | src_devid, NULL, NULL, true); |
e4319cd9 | 157 | dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices, |
e93c89c1 | 158 | BTRFS_DEV_REPLACE_DEVID, |
09ba3bc9 | 159 | NULL, NULL, true); |
e93c89c1 SB |
160 | /* |
161 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
162 | * missing | |
163 | */ | |
164 | if (!dev_replace->srcdev && | |
0b246afa | 165 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 166 | ret = -EIO; |
efe120a0 FH |
167 | btrfs_warn(fs_info, |
168 | "cannot mount because device replace operation is ongoing and"); | |
169 | btrfs_warn(fs_info, | |
170 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
171 | src_devid); | |
e93c89c1 SB |
172 | } |
173 | if (!dev_replace->tgtdev && | |
0b246afa | 174 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 175 | ret = -EIO; |
efe120a0 FH |
176 | btrfs_warn(fs_info, |
177 | "cannot mount because device replace operation is ongoing and"); | |
178 | btrfs_warn(fs_info, | |
179 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
6e71c47a | 180 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
181 | } |
182 | if (dev_replace->tgtdev) { | |
183 | if (dev_replace->srcdev) { | |
184 | dev_replace->tgtdev->total_bytes = | |
185 | dev_replace->srcdev->total_bytes; | |
186 | dev_replace->tgtdev->disk_total_bytes = | |
187 | dev_replace->srcdev->disk_total_bytes; | |
935e5cc9 MX |
188 | dev_replace->tgtdev->commit_total_bytes = |
189 | dev_replace->srcdev->commit_total_bytes; | |
e93c89c1 SB |
190 | dev_replace->tgtdev->bytes_used = |
191 | dev_replace->srcdev->bytes_used; | |
ce7213c7 MX |
192 | dev_replace->tgtdev->commit_bytes_used = |
193 | dev_replace->srcdev->commit_bytes_used; | |
e93c89c1 | 194 | } |
401e29c1 AJ |
195 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, |
196 | &dev_replace->tgtdev->dev_state); | |
15fc1283 AJ |
197 | |
198 | WARN_ON(fs_info->fs_devices->rw_devices == 0); | |
199 | dev_replace->tgtdev->io_width = fs_info->sectorsize; | |
200 | dev_replace->tgtdev->io_align = fs_info->sectorsize; | |
201 | dev_replace->tgtdev->sector_size = fs_info->sectorsize; | |
202 | dev_replace->tgtdev->fs_info = fs_info; | |
203 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, | |
204 | &dev_replace->tgtdev->dev_state); | |
e93c89c1 SB |
205 | } |
206 | break; | |
207 | } | |
208 | ||
209 | out: | |
527afb44 | 210 | btrfs_free_path(path); |
e93c89c1 SB |
211 | return ret; |
212 | } | |
213 | ||
d48f39d5 DS |
214 | /* |
215 | * Initialize a new device for device replace target from a given source dev | |
216 | * and path. | |
217 | * | |
218 | * Return 0 and new device in @device_out, otherwise return < 0 | |
219 | */ | |
220 | static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
221 | const char *device_path, | |
222 | struct btrfs_device *srcdev, | |
223 | struct btrfs_device **device_out) | |
224 | { | |
225 | struct btrfs_device *device; | |
226 | struct block_device *bdev; | |
227 | struct list_head *devices; | |
228 | struct rcu_string *name; | |
229 | u64 devid = BTRFS_DEV_REPLACE_DEVID; | |
230 | int ret = 0; | |
231 | ||
232 | *device_out = NULL; | |
233 | if (fs_info->fs_devices->seeding) { | |
234 | btrfs_err(fs_info, "the filesystem is a seed filesystem!"); | |
235 | return -EINVAL; | |
236 | } | |
237 | ||
238 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, | |
239 | fs_info->bdev_holder); | |
240 | if (IS_ERR(bdev)) { | |
241 | btrfs_err(fs_info, "target device %s is invalid!", device_path); | |
242 | return PTR_ERR(bdev); | |
243 | } | |
244 | ||
ddb93784 | 245 | sync_blockdev(bdev); |
d48f39d5 DS |
246 | |
247 | devices = &fs_info->fs_devices->devices; | |
248 | list_for_each_entry(device, devices, dev_list) { | |
249 | if (device->bdev == bdev) { | |
250 | btrfs_err(fs_info, | |
251 | "target device is in the filesystem!"); | |
252 | ret = -EEXIST; | |
253 | goto error; | |
254 | } | |
255 | } | |
256 | ||
257 | ||
258 | if (i_size_read(bdev->bd_inode) < | |
259 | btrfs_device_get_total_bytes(srcdev)) { | |
260 | btrfs_err(fs_info, | |
261 | "target device is smaller than source device!"); | |
262 | ret = -EINVAL; | |
263 | goto error; | |
264 | } | |
265 | ||
266 | ||
267 | device = btrfs_alloc_device(NULL, &devid, NULL); | |
268 | if (IS_ERR(device)) { | |
269 | ret = PTR_ERR(device); | |
270 | goto error; | |
271 | } | |
272 | ||
273 | name = rcu_string_strdup(device_path, GFP_KERNEL); | |
274 | if (!name) { | |
275 | btrfs_free_device(device); | |
276 | ret = -ENOMEM; | |
277 | goto error; | |
278 | } | |
279 | rcu_assign_pointer(device->name, name); | |
280 | ||
d48f39d5 DS |
281 | set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); |
282 | device->generation = 0; | |
283 | device->io_width = fs_info->sectorsize; | |
284 | device->io_align = fs_info->sectorsize; | |
285 | device->sector_size = fs_info->sectorsize; | |
286 | device->total_bytes = btrfs_device_get_total_bytes(srcdev); | |
287 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); | |
288 | device->bytes_used = btrfs_device_get_bytes_used(srcdev); | |
289 | device->commit_total_bytes = srcdev->commit_total_bytes; | |
290 | device->commit_bytes_used = device->bytes_used; | |
291 | device->fs_info = fs_info; | |
292 | device->bdev = bdev; | |
293 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); | |
294 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); | |
295 | device->mode = FMODE_EXCL; | |
296 | device->dev_stats_valid = 1; | |
297 | set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE); | |
298 | device->fs_devices = fs_info->fs_devices; | |
b0d9e1ea NB |
299 | |
300 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
d48f39d5 DS |
301 | list_add(&device->dev_list, &fs_info->fs_devices->devices); |
302 | fs_info->fs_devices->num_devices++; | |
303 | fs_info->fs_devices->open_devices++; | |
304 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
305 | ||
306 | *device_out = device; | |
307 | return 0; | |
308 | ||
309 | error: | |
310 | blkdev_put(bdev, FMODE_EXCL); | |
311 | return ret; | |
312 | } | |
313 | ||
e93c89c1 SB |
314 | /* |
315 | * called from commit_transaction. Writes changed device replace state to | |
316 | * disk. | |
317 | */ | |
2b584c68 | 318 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans) |
e93c89c1 | 319 | { |
2b584c68 | 320 | struct btrfs_fs_info *fs_info = trans->fs_info; |
e93c89c1 SB |
321 | int ret; |
322 | struct btrfs_root *dev_root = fs_info->dev_root; | |
323 | struct btrfs_path *path; | |
324 | struct btrfs_key key; | |
325 | struct extent_buffer *eb; | |
326 | struct btrfs_dev_replace_item *ptr; | |
327 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
328 | ||
cb5583dd | 329 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
330 | if (!dev_replace->is_valid || |
331 | !dev_replace->item_needs_writeback) { | |
cb5583dd | 332 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
333 | return 0; |
334 | } | |
cb5583dd | 335 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
336 | |
337 | key.objectid = 0; | |
338 | key.type = BTRFS_DEV_REPLACE_KEY; | |
339 | key.offset = 0; | |
340 | ||
341 | path = btrfs_alloc_path(); | |
342 | if (!path) { | |
343 | ret = -ENOMEM; | |
344 | goto out; | |
345 | } | |
346 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
347 | if (ret < 0) { | |
5d163e0e JM |
348 | btrfs_warn(fs_info, |
349 | "error %d while searching for dev_replace item!", | |
350 | ret); | |
e93c89c1 SB |
351 | goto out; |
352 | } | |
353 | ||
354 | if (ret == 0 && | |
355 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
356 | /* | |
357 | * need to delete old one and insert a new one. | |
358 | * Since no attempt is made to recover any old state, if the | |
359 | * dev_replace state is 'running', the data on the target | |
360 | * drive is lost. | |
361 | * It would be possible to recover the state: just make sure | |
362 | * that the beginning of the item is never changed and always | |
363 | * contains all the essential information. Then read this | |
364 | * minimal set of information and use it as a base for the | |
365 | * new state. | |
366 | */ | |
367 | ret = btrfs_del_item(trans, dev_root, path); | |
368 | if (ret != 0) { | |
5d163e0e JM |
369 | btrfs_warn(fs_info, |
370 | "delete too small dev_replace item failed %d!", | |
371 | ret); | |
e93c89c1 SB |
372 | goto out; |
373 | } | |
374 | ret = 1; | |
375 | } | |
376 | ||
377 | if (ret == 1) { | |
378 | /* need to insert a new item */ | |
379 | btrfs_release_path(path); | |
380 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
381 | &key, sizeof(*ptr)); | |
382 | if (ret < 0) { | |
5d163e0e JM |
383 | btrfs_warn(fs_info, |
384 | "insert dev_replace item failed %d!", ret); | |
e93c89c1 SB |
385 | goto out; |
386 | } | |
387 | } | |
388 | ||
389 | eb = path->nodes[0]; | |
390 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
391 | struct btrfs_dev_replace_item); | |
392 | ||
cb5583dd | 393 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
394 | if (dev_replace->srcdev) |
395 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
396 | dev_replace->srcdev->devid); | |
397 | else | |
398 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
399 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
400 | dev_replace->cont_reading_from_srcdev_mode); | |
401 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
402 | dev_replace->replace_state); | |
403 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
404 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
405 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
406 | atomic64_read(&dev_replace->num_write_errors)); | |
407 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
408 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
409 | dev_replace->cursor_left_last_write_of_item = | |
410 | dev_replace->cursor_left; | |
411 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
412 | dev_replace->cursor_left_last_write_of_item); | |
413 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
414 | dev_replace->cursor_right); | |
415 | dev_replace->item_needs_writeback = 0; | |
cb5583dd | 416 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
417 | |
418 | btrfs_mark_buffer_dirty(eb); | |
419 | ||
420 | out: | |
421 | btrfs_free_path(path); | |
422 | ||
423 | return ret; | |
424 | } | |
425 | ||
3c958bd2 AJ |
426 | static char* btrfs_dev_name(struct btrfs_device *device) |
427 | { | |
acf18c56 | 428 | if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) |
3c958bd2 AJ |
429 | return "<missing disk>"; |
430 | else | |
431 | return rcu_str_deref(device->name); | |
432 | } | |
433 | ||
54862d6d | 434 | static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
da353f6b DS |
435 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, |
436 | int read_src) | |
e93c89c1 | 437 | { |
2ff7e61e | 438 | struct btrfs_root *root = fs_info->dev_root; |
e93c89c1 | 439 | struct btrfs_trans_handle *trans; |
e93c89c1 SB |
440 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
441 | int ret; | |
442 | struct btrfs_device *tgt_device = NULL; | |
443 | struct btrfs_device *src_device = NULL; | |
444 | ||
a27a94c2 NB |
445 | src_device = btrfs_find_device_by_devspec(fs_info, srcdevid, |
446 | srcdev_name); | |
447 | if (IS_ERR(src_device)) | |
448 | return PTR_ERR(src_device); | |
e93c89c1 | 449 | |
eede2bf3 OS |
450 | if (btrfs_pinned_by_swapfile(fs_info, src_device)) { |
451 | btrfs_warn_in_rcu(fs_info, | |
452 | "cannot replace device %s (devid %llu) due to active swapfile", | |
453 | btrfs_dev_name(src_device), src_device->devid); | |
454 | return -ETXTBSY; | |
455 | } | |
456 | ||
9e271ae2 AJ |
457 | /* |
458 | * Here we commit the transaction to make sure commit_total_bytes | |
459 | * of all the devices are updated. | |
460 | */ | |
461 | trans = btrfs_attach_transaction(root); | |
462 | if (!IS_ERR(trans)) { | |
3a45bb20 | 463 | ret = btrfs_commit_transaction(trans); |
9e271ae2 AJ |
464 | if (ret) |
465 | return ret; | |
466 | } else if (PTR_ERR(trans) != -ENOENT) { | |
467 | return PTR_ERR(trans); | |
468 | } | |
469 | ||
e1e0eb43 NB |
470 | ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name, |
471 | src_device, &tgt_device); | |
472 | if (ret) | |
473 | return ret; | |
474 | ||
cb5583dd | 475 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
476 | switch (dev_replace->replace_state) { |
477 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
478 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
479 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
480 | break; | |
481 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
482 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
5c061471 | 483 | ASSERT(0); |
b5255456 | 484 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
fa19452a | 485 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
486 | goto leave; |
487 | } | |
488 | ||
b5255456 | 489 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
e93c89c1 | 490 | dev_replace->srcdev = src_device; |
e93c89c1 SB |
491 | dev_replace->tgtdev = tgt_device; |
492 | ||
fc23c246 | 493 | btrfs_info_in_rcu(fs_info, |
ecaeb14b | 494 | "dev_replace from %s (devid %llu) to %s started", |
3c958bd2 | 495 | btrfs_dev_name(src_device), |
e93c89c1 SB |
496 | src_device->devid, |
497 | rcu_str_deref(tgt_device->name)); | |
498 | ||
e93c89c1 SB |
499 | /* |
500 | * from now on, the writes to the srcdev are all duplicated to | |
501 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
502 | */ | |
503 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
a944442c | 504 | dev_replace->time_started = ktime_get_real_seconds(); |
e93c89c1 SB |
505 | dev_replace->cursor_left = 0; |
506 | dev_replace->committed_cursor_left = 0; | |
507 | dev_replace->cursor_left_last_write_of_item = 0; | |
508 | dev_replace->cursor_right = 0; | |
509 | dev_replace->is_valid = 1; | |
510 | dev_replace->item_needs_writeback = 1; | |
7ccefb98 YK |
511 | atomic64_set(&dev_replace->num_write_errors, 0); |
512 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
cb5583dd | 513 | up_write(&dev_replace->rwsem); |
e93c89c1 | 514 | |
f3cd2c58 | 515 | ret = btrfs_sysfs_add_devices_dir(tgt_device->fs_devices, tgt_device); |
73416dab | 516 | if (ret) |
ab8d0fc4 | 517 | btrfs_err(fs_info, "kobj add dev failed %d", ret); |
73416dab | 518 | |
6374e57a | 519 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 | 520 | |
f232ab04 NB |
521 | /* Commit dev_replace state and reserve 1 item for it. */ |
522 | trans = btrfs_start_transaction(root, 1); | |
e93c89c1 SB |
523 | if (IS_ERR(trans)) { |
524 | ret = PTR_ERR(trans); | |
cb5583dd | 525 | down_write(&dev_replace->rwsem); |
5c061471 JM |
526 | dev_replace->replace_state = |
527 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; | |
528 | dev_replace->srcdev = NULL; | |
529 | dev_replace->tgtdev = NULL; | |
fa19452a | 530 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
531 | goto leave; |
532 | } | |
533 | ||
3a45bb20 | 534 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
535 | WARN_ON(ret); |
536 | ||
537 | /* the disk copy procedure reuses the scrub code */ | |
538 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 539 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
540 | &dev_replace->scrub_progress, 0, 1); |
541 | ||
fc23c246 | 542 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
4cea9037 | 543 | if (ret == -EINPROGRESS) |
b5255456 | 544 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
e93c89c1 | 545 | |
2fc9f6ba | 546 | return ret; |
e93c89c1 SB |
547 | |
548 | leave: | |
4f5ad7bd | 549 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
e93c89c1 SB |
550 | return ret; |
551 | } | |
552 | ||
2ff7e61e | 553 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
b5255456 AJ |
554 | struct btrfs_ioctl_dev_replace_args *args) |
555 | { | |
556 | int ret; | |
557 | ||
558 | switch (args->start.cont_reading_from_srcdev_mode) { | |
559 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
560 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
561 | break; | |
562 | default: | |
563 | return -EINVAL; | |
564 | } | |
565 | ||
566 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
567 | args->start.tgtdev_name[0] == '\0') | |
568 | return -EINVAL; | |
569 | ||
2ff7e61e | 570 | ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name, |
b5255456 AJ |
571 | args->start.srcdevid, |
572 | args->start.srcdev_name, | |
573 | args->start.cont_reading_from_srcdev_mode); | |
574 | args->result = ret; | |
575 | /* don't warn if EINPROGRESS, someone else might be running scrub */ | |
53e62fb5 AJ |
576 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS || |
577 | ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) | |
578 | return 0; | |
b5255456 AJ |
579 | |
580 | return ret; | |
581 | } | |
582 | ||
c404e0dc | 583 | /* |
01327610 | 584 | * blocked until all in-flight bios operations are finished. |
c404e0dc MX |
585 | */ |
586 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
587 | { | |
c404e0dc | 588 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
7f8d236a DS |
589 | wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum( |
590 | &fs_info->dev_replace.bio_counter)); | |
c404e0dc MX |
591 | } |
592 | ||
593 | /* | |
594 | * we have removed target device, it is safe to allow new bios request. | |
595 | */ | |
596 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
597 | { | |
598 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
7f8d236a | 599 | wake_up(&fs_info->dev_replace.replace_wait); |
c404e0dc MX |
600 | } |
601 | ||
4c8f3532 FM |
602 | /* |
603 | * When finishing the device replace, before swapping the source device with the | |
604 | * target device we must update the chunk allocation state in the target device, | |
605 | * as it is empty because replace works by directly copying the chunks and not | |
606 | * through the normal chunk allocation path. | |
607 | */ | |
608 | static int btrfs_set_target_alloc_state(struct btrfs_device *srcdev, | |
609 | struct btrfs_device *tgtdev) | |
610 | { | |
611 | struct extent_state *cached_state = NULL; | |
612 | u64 start = 0; | |
613 | u64 found_start; | |
614 | u64 found_end; | |
615 | int ret = 0; | |
616 | ||
617 | lockdep_assert_held(&srcdev->fs_info->chunk_mutex); | |
618 | ||
619 | while (!find_first_extent_bit(&srcdev->alloc_state, start, | |
620 | &found_start, &found_end, | |
621 | CHUNK_ALLOCATED, &cached_state)) { | |
622 | ret = set_extent_bits(&tgtdev->alloc_state, found_start, | |
623 | found_end, CHUNK_ALLOCATED); | |
624 | if (ret) | |
625 | break; | |
626 | start = found_end + 1; | |
627 | } | |
628 | ||
629 | free_extent_state(cached_state); | |
630 | return ret; | |
631 | } | |
632 | ||
e93c89c1 SB |
633 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
634 | int scrub_ret) | |
635 | { | |
636 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
637 | struct btrfs_device *tgt_device; | |
638 | struct btrfs_device *src_device; | |
639 | struct btrfs_root *root = fs_info->tree_root; | |
640 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
641 | struct btrfs_trans_handle *trans; | |
642 | int ret = 0; | |
643 | ||
644 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
645 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
646 | ||
cb5583dd | 647 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
648 | /* was the operation canceled, or is it finished? */ |
649 | if (dev_replace->replace_state != | |
650 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
cb5583dd | 651 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
652 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
653 | return 0; | |
654 | } | |
655 | ||
656 | tgt_device = dev_replace->tgtdev; | |
657 | src_device = dev_replace->srcdev; | |
cb5583dd | 658 | up_read(&dev_replace->rwsem); |
e93c89c1 | 659 | |
e93c89c1 SB |
660 | /* |
661 | * flush all outstanding I/O and inode extent mappings before the | |
662 | * copy operation is declared as being finished | |
663 | */ | |
b4912139 | 664 | ret = btrfs_start_delalloc_roots(fs_info, U64_MAX); |
3edb2a68 MX |
665 | if (ret) { |
666 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
667 | return ret; | |
668 | } | |
6374e57a | 669 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 | 670 | |
debd1c06 NB |
671 | /* |
672 | * We have to use this loop approach because at this point src_device | |
673 | * has to be available for transaction commit to complete, yet new | |
674 | * chunks shouldn't be allocated on the device. | |
675 | */ | |
676 | while (1) { | |
677 | trans = btrfs_start_transaction(root, 0); | |
678 | if (IS_ERR(trans)) { | |
679 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
680 | return PTR_ERR(trans); | |
681 | } | |
682 | ret = btrfs_commit_transaction(trans); | |
683 | WARN_ON(ret); | |
684 | ||
685 | /* Prevent write_all_supers() during the finishing procedure */ | |
686 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
687 | /* Prevent new chunks being allocated on the source device */ | |
688 | mutex_lock(&fs_info->chunk_mutex); | |
689 | ||
690 | if (!list_empty(&src_device->post_commit_list)) { | |
691 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
692 | mutex_unlock(&fs_info->chunk_mutex); | |
693 | } else { | |
694 | break; | |
695 | } | |
e93c89c1 | 696 | } |
e93c89c1 | 697 | |
cb5583dd | 698 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
699 | dev_replace->replace_state = |
700 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
701 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
702 | dev_replace->tgtdev = NULL; | |
703 | dev_replace->srcdev = NULL; | |
a944442c | 704 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 SB |
705 | dev_replace->item_needs_writeback = 1; |
706 | ||
4c8f3532 FM |
707 | /* |
708 | * Update allocation state in the new device and replace the old device | |
709 | * with the new one in the mapping tree. | |
710 | */ | |
c404e0dc | 711 | if (!scrub_ret) { |
4c8f3532 FM |
712 | scrub_ret = btrfs_set_target_alloc_state(src_device, tgt_device); |
713 | if (scrub_ret) | |
714 | goto error; | |
c404e0dc MX |
715 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
716 | src_device, | |
717 | tgt_device); | |
718 | } else { | |
f9085abf AJ |
719 | if (scrub_ret != -ECANCELED) |
720 | btrfs_err_in_rcu(fs_info, | |
0b246afa | 721 | "btrfs_scrub_dev(%s, %llu, %s) failed %d", |
3c958bd2 | 722 | btrfs_dev_name(src_device), |
0b246afa JM |
723 | src_device->devid, |
724 | rcu_str_deref(tgt_device->name), scrub_ret); | |
4c8f3532 | 725 | error: |
cb5583dd | 726 | up_write(&dev_replace->rwsem); |
0b246afa JM |
727 | mutex_unlock(&fs_info->chunk_mutex); |
728 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
ae6529c3 | 729 | btrfs_rm_dev_replace_blocked(fs_info); |
e93c89c1 | 730 | if (tgt_device) |
4f5ad7bd | 731 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
ae6529c3 | 732 | btrfs_rm_dev_replace_unblocked(fs_info); |
e93c89c1 SB |
733 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
734 | ||
2fc9f6ba | 735 | return scrub_ret; |
e93c89c1 SB |
736 | } |
737 | ||
0b246afa JM |
738 | btrfs_info_in_rcu(fs_info, |
739 | "dev_replace from %s (devid %llu) to %s finished", | |
3c958bd2 | 740 | btrfs_dev_name(src_device), |
0b246afa JM |
741 | src_device->devid, |
742 | rcu_str_deref(tgt_device->name)); | |
401e29c1 | 743 | clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &tgt_device->dev_state); |
e93c89c1 SB |
744 | tgt_device->devid = src_device->devid; |
745 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
746 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
747 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
748 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
749 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
750 | btrfs_device_set_disk_total_bytes(tgt_device, | |
751 | src_device->disk_total_bytes); | |
752 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
ce7213c7 | 753 | tgt_device->commit_bytes_used = src_device->bytes_used; |
88acff64 | 754 | |
d6507cf1 | 755 | btrfs_assign_next_active_device(src_device, tgt_device); |
88acff64 | 756 | |
e93c89c1 | 757 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); |
82372bc8 | 758 | fs_info->fs_devices->rw_devices++; |
e93c89c1 | 759 | |
cb5583dd | 760 | up_write(&dev_replace->rwsem); |
c404e0dc MX |
761 | btrfs_rm_dev_replace_blocked(fs_info); |
762 | ||
68a9db5f | 763 | btrfs_rm_dev_replace_remove_srcdev(src_device); |
1357272f | 764 | |
c404e0dc MX |
765 | btrfs_rm_dev_replace_unblocked(fs_info); |
766 | ||
1e7e1f9e MT |
767 | /* |
768 | * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will | |
769 | * update on-disk dev stats value during commit transaction | |
770 | */ | |
771 | atomic_inc(&tgt_device->dev_stats_ccnt); | |
772 | ||
e93c89c1 SB |
773 | /* |
774 | * this is again a consistent state where no dev_replace procedure | |
775 | * is running, the target device is part of the filesystem, the | |
776 | * source device is not part of the filesystem anymore and its 1st | |
777 | * superblock is scratched out so that it is no longer marked to | |
778 | * belong to this filesystem. | |
779 | */ | |
0b246afa JM |
780 | mutex_unlock(&fs_info->chunk_mutex); |
781 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
e93c89c1 | 782 | |
084b6e7c | 783 | /* replace the sysfs entry */ |
f3cd2c58 | 784 | btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, src_device); |
668e48af | 785 | btrfs_sysfs_update_devid(tgt_device); |
313b0858 JB |
786 | if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state)) |
787 | btrfs_scratch_superblocks(fs_info, src_device->bdev, | |
788 | src_device->name->str); | |
084b6e7c | 789 | |
e93c89c1 SB |
790 | /* write back the superblocks */ |
791 | trans = btrfs_start_transaction(root, 0); | |
792 | if (!IS_ERR(trans)) | |
3a45bb20 | 793 | btrfs_commit_transaction(trans); |
e93c89c1 SB |
794 | |
795 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
796 | ||
a466c85e JB |
797 | btrfs_rm_dev_replace_free_srcdev(src_device); |
798 | ||
e93c89c1 SB |
799 | return 0; |
800 | } | |
801 | ||
802 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
803 | struct btrfs_fs_info *fs_info, | |
804 | struct btrfs_device *srcdev, | |
805 | struct btrfs_device *tgtdev) | |
806 | { | |
c8bf1b67 | 807 | struct extent_map_tree *em_tree = &fs_info->mapping_tree; |
e93c89c1 SB |
808 | struct extent_map *em; |
809 | struct map_lookup *map; | |
810 | u64 start = 0; | |
811 | int i; | |
812 | ||
813 | write_lock(&em_tree->lock); | |
814 | do { | |
815 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
816 | if (!em) | |
817 | break; | |
95617d69 | 818 | map = em->map_lookup; |
e93c89c1 SB |
819 | for (i = 0; i < map->num_stripes; i++) |
820 | if (srcdev == map->stripes[i].dev) | |
821 | map->stripes[i].dev = tgtdev; | |
822 | start = em->start + em->len; | |
823 | free_extent_map(em); | |
824 | } while (start); | |
825 | write_unlock(&em_tree->lock); | |
826 | } | |
827 | ||
74b595fe DS |
828 | /* |
829 | * Read progress of device replace status according to the state and last | |
830 | * stored position. The value format is the same as for | |
831 | * btrfs_dev_replace::progress_1000 | |
832 | */ | |
833 | static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info) | |
834 | { | |
835 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
836 | u64 ret = 0; | |
837 | ||
838 | switch (dev_replace->replace_state) { | |
839 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
840 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
841 | ret = 0; | |
842 | break; | |
843 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
844 | ret = 1000; | |
845 | break; | |
846 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
847 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
848 | ret = div64_u64(dev_replace->cursor_left, | |
849 | div_u64(btrfs_device_get_total_bytes( | |
850 | dev_replace->srcdev), 1000)); | |
851 | break; | |
852 | } | |
853 | ||
854 | return ret; | |
855 | } | |
856 | ||
e93c89c1 SB |
857 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
858 | struct btrfs_ioctl_dev_replace_args *args) | |
859 | { | |
860 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
861 | ||
cb5583dd | 862 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
863 | /* even if !dev_replace_is_valid, the values are good enough for |
864 | * the replace_status ioctl */ | |
865 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
866 | args->status.replace_state = dev_replace->replace_state; | |
867 | args->status.time_started = dev_replace->time_started; | |
868 | args->status.time_stopped = dev_replace->time_stopped; | |
869 | args->status.num_write_errors = | |
870 | atomic64_read(&dev_replace->num_write_errors); | |
871 | args->status.num_uncorrectable_read_errors = | |
872 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
74b595fe | 873 | args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); |
cb5583dd | 874 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
875 | } |
876 | ||
18e67c73 | 877 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
e93c89c1 SB |
878 | { |
879 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
880 | struct btrfs_device *tgt_device = NULL; | |
8f2ceaa7 | 881 | struct btrfs_device *src_device = NULL; |
e93c89c1 SB |
882 | struct btrfs_trans_handle *trans; |
883 | struct btrfs_root *root = fs_info->tree_root; | |
18e67c73 | 884 | int result; |
e93c89c1 SB |
885 | int ret; |
886 | ||
bc98a42c | 887 | if (sb_rdonly(fs_info->sb)) |
e649e587 ID |
888 | return -EROFS; |
889 | ||
e93c89c1 | 890 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
cb5583dd | 891 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
892 | switch (dev_replace->replace_state) { |
893 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
894 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
895 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
896 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
cb5583dd | 897 | up_write(&dev_replace->rwsem); |
d189dd70 | 898 | break; |
e93c89c1 | 899 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
d189dd70 AJ |
900 | tgt_device = dev_replace->tgtdev; |
901 | src_device = dev_replace->srcdev; | |
cb5583dd | 902 | up_write(&dev_replace->rwsem); |
b47dda2e AJ |
903 | ret = btrfs_scrub_cancel(fs_info); |
904 | if (ret < 0) { | |
905 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
906 | } else { | |
907 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
908 | /* | |
909 | * btrfs_dev_replace_finishing() will handle the | |
910 | * cleanup part | |
911 | */ | |
912 | btrfs_info_in_rcu(fs_info, | |
913 | "dev_replace from %s (devid %llu) to %s canceled", | |
914 | btrfs_dev_name(src_device), src_device->devid, | |
915 | btrfs_dev_name(tgt_device)); | |
916 | } | |
d189dd70 | 917 | break; |
e93c89c1 | 918 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
d189dd70 AJ |
919 | /* |
920 | * Scrub doing the replace isn't running so we need to do the | |
921 | * cleanup step of btrfs_dev_replace_finishing() here | |
922 | */ | |
e93c89c1 SB |
923 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
924 | tgt_device = dev_replace->tgtdev; | |
8f2ceaa7 | 925 | src_device = dev_replace->srcdev; |
e93c89c1 SB |
926 | dev_replace->tgtdev = NULL; |
927 | dev_replace->srcdev = NULL; | |
d189dd70 AJ |
928 | dev_replace->replace_state = |
929 | BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
930 | dev_replace->time_stopped = ktime_get_real_seconds(); | |
931 | dev_replace->item_needs_writeback = 1; | |
e93c89c1 | 932 | |
cb5583dd | 933 | up_write(&dev_replace->rwsem); |
8f2ceaa7 | 934 | |
fe97e2e1 AJ |
935 | /* Scrub for replace must not be running in suspended state */ |
936 | ret = btrfs_scrub_cancel(fs_info); | |
937 | ASSERT(ret != -ENOTCONN); | |
d189dd70 AJ |
938 | |
939 | trans = btrfs_start_transaction(root, 0); | |
940 | if (IS_ERR(trans)) { | |
941 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
942 | return PTR_ERR(trans); | |
943 | } | |
944 | ret = btrfs_commit_transaction(trans); | |
945 | WARN_ON(ret); | |
8f2ceaa7 | 946 | |
d189dd70 AJ |
947 | btrfs_info_in_rcu(fs_info, |
948 | "suspended dev_replace from %s (devid %llu) to %s canceled", | |
949 | btrfs_dev_name(src_device), src_device->devid, | |
950 | btrfs_dev_name(tgt_device)); | |
951 | ||
952 | if (tgt_device) | |
953 | btrfs_destroy_dev_replace_tgtdev(tgt_device); | |
954 | break; | |
955 | default: | |
669e859b | 956 | up_write(&dev_replace->rwsem); |
d189dd70 AJ |
957 | result = -EINVAL; |
958 | } | |
e93c89c1 | 959 | |
e93c89c1 SB |
960 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
961 | return result; | |
962 | } | |
963 | ||
964 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
965 | { | |
966 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
967 | ||
968 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
cb5583dd DS |
969 | down_write(&dev_replace->rwsem); |
970 | ||
e93c89c1 SB |
971 | switch (dev_replace->replace_state) { |
972 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
973 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
974 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
975 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
976 | break; | |
977 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
978 | dev_replace->replace_state = | |
979 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
a944442c | 980 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 | 981 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 982 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
983 | break; |
984 | } | |
985 | ||
cb5583dd | 986 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
987 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
988 | } | |
989 | ||
990 | /* resume dev_replace procedure that was interrupted by unmount */ | |
991 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
992 | { | |
993 | struct task_struct *task; | |
994 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
995 | ||
cb5583dd DS |
996 | down_write(&dev_replace->rwsem); |
997 | ||
e93c89c1 SB |
998 | switch (dev_replace->replace_state) { |
999 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1000 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1001 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
cb5583dd | 1002 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1003 | return 0; |
1004 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1005 | break; | |
1006 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1007 | dev_replace->replace_state = | |
1008 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
1009 | break; | |
1010 | } | |
1011 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 | 1012 | btrfs_info(fs_info, |
5d163e0e JM |
1013 | "cannot continue dev_replace, tgtdev is missing"); |
1014 | btrfs_info(fs_info, | |
1015 | "you may cancel the operation after 'mount -o degraded'"); | |
0d228ece AJ |
1016 | dev_replace->replace_state = |
1017 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 1018 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
1019 | return 0; |
1020 | } | |
cb5583dd | 1021 | up_write(&dev_replace->rwsem); |
e93c89c1 | 1022 | |
010a47bd DS |
1023 | /* |
1024 | * This could collide with a paused balance, but the exclusive op logic | |
1025 | * should never allow both to start and pause. We don't want to allow | |
1026 | * dev-replace to start anyway. | |
1027 | */ | |
1028 | if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { | |
cb5583dd | 1029 | down_write(&dev_replace->rwsem); |
05c49e6b AJ |
1030 | dev_replace->replace_state = |
1031 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 1032 | up_write(&dev_replace->rwsem); |
010a47bd DS |
1033 | btrfs_info(fs_info, |
1034 | "cannot resume dev-replace, other exclusive operation running"); | |
1035 | return 0; | |
1036 | } | |
1037 | ||
e93c89c1 | 1038 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
8c6ffba0 | 1039 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
1040 | } |
1041 | ||
1042 | static int btrfs_dev_replace_kthread(void *data) | |
1043 | { | |
1044 | struct btrfs_fs_info *fs_info = data; | |
1045 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
e93c89c1 | 1046 | u64 progress; |
00251a52 | 1047 | int ret; |
e93c89c1 | 1048 | |
f1b8a1e8 DS |
1049 | progress = btrfs_dev_replace_progress(fs_info); |
1050 | progress = div_u64(progress, 10); | |
1051 | btrfs_info_in_rcu(fs_info, | |
3c958bd2 AJ |
1052 | "continuing dev_replace from %s (devid %llu) to target %s @%u%%", |
1053 | btrfs_dev_name(dev_replace->srcdev), | |
f1b8a1e8 | 1054 | dev_replace->srcdev->devid, |
3c958bd2 | 1055 | btrfs_dev_name(dev_replace->tgtdev), |
f1b8a1e8 DS |
1056 | (unsigned int)progress); |
1057 | ||
e93c89c1 SB |
1058 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
1059 | dev_replace->committed_cursor_left, | |
7cc8e58d | 1060 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
1061 | &dev_replace->scrub_progress, 0, 1); |
1062 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
49365e69 | 1063 | WARN_ON(ret && ret != -ECANCELED); |
00251a52 DS |
1064 | |
1065 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); | |
e93c89c1 SB |
1066 | return 0; |
1067 | } | |
1068 | ||
e1f60a65 | 1069 | int __pure btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
e93c89c1 SB |
1070 | { |
1071 | if (!dev_replace->is_valid) | |
1072 | return 0; | |
1073 | ||
1074 | switch (dev_replace->replace_state) { | |
1075 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
1076 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
1077 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
1078 | return 0; | |
1079 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
1080 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
1081 | /* | |
1082 | * return true even if tgtdev is missing (this is | |
1083 | * something that can happen if the dev_replace | |
1084 | * procedure is suspended by an umount and then | |
1085 | * the tgtdev is missing (or "btrfs dev scan") was | |
52042d8e | 1086 | * not called and the filesystem is remounted |
e93c89c1 SB |
1087 | * in degraded state. This does not stop the |
1088 | * dev_replace procedure. It needs to be canceled | |
bb7ab3b9 | 1089 | * manually if the cancellation is wanted. |
e93c89c1 SB |
1090 | */ |
1091 | break; | |
1092 | } | |
1093 | return 1; | |
1094 | } | |
1095 | ||
c404e0dc MX |
1096 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) |
1097 | { | |
7f8d236a | 1098 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
c404e0dc MX |
1099 | } |
1100 | ||
4245215d | 1101 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
c404e0dc | 1102 | { |
7f8d236a DS |
1103 | percpu_counter_sub(&fs_info->dev_replace.bio_counter, amount); |
1104 | cond_wake_up_nomb(&fs_info->dev_replace.replace_wait); | |
c404e0dc MX |
1105 | } |
1106 | ||
1107 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
1108 | { | |
09dd7a01 | 1109 | while (1) { |
7f8d236a | 1110 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
09dd7a01 ZL |
1111 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1112 | &fs_info->fs_state))) | |
1113 | break; | |
1114 | ||
c404e0dc | 1115 | btrfs_bio_counter_dec(fs_info); |
7f8d236a | 1116 | wait_event(fs_info->dev_replace.replace_wait, |
c404e0dc MX |
1117 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1118 | &fs_info->fs_state)); | |
c404e0dc | 1119 | } |
c404e0dc | 1120 | } |