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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e93c89c1 SB |
2 | /* |
3 | * Copyright (C) STRATO AG 2012. All rights reserved. | |
e93c89c1 | 4 | */ |
c1d7c514 | 5 | |
e93c89c1 SB |
6 | #include <linux/sched.h> |
7 | #include <linux/bio.h> | |
8 | #include <linux/slab.h> | |
e93c89c1 | 9 | #include <linux/blkdev.h> |
e93c89c1 SB |
10 | #include <linux/kthread.h> |
11 | #include <linux/math64.h> | |
e93c89c1 SB |
12 | #include "ctree.h" |
13 | #include "extent_map.h" | |
14 | #include "disk-io.h" | |
15 | #include "transaction.h" | |
16 | #include "print-tree.h" | |
17 | #include "volumes.h" | |
18 | #include "async-thread.h" | |
19 | #include "check-integrity.h" | |
20 | #include "rcu-string.h" | |
21 | #include "dev-replace.h" | |
49c6f736 | 22 | #include "sysfs.h" |
e93c89c1 | 23 | |
e93c89c1 SB |
24 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
25 | int scrub_ret); | |
26 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
27 | struct btrfs_fs_info *fs_info, | |
28 | struct btrfs_device *srcdev, | |
29 | struct btrfs_device *tgtdev); | |
e93c89c1 | 30 | static int btrfs_dev_replace_kthread(void *data); |
e93c89c1 SB |
31 | |
32 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
33 | { | |
34 | struct btrfs_key key; | |
35 | struct btrfs_root *dev_root = fs_info->dev_root; | |
36 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
37 | struct extent_buffer *eb; | |
38 | int slot; | |
39 | int ret = 0; | |
40 | struct btrfs_path *path = NULL; | |
41 | int item_size; | |
42 | struct btrfs_dev_replace_item *ptr; | |
43 | u64 src_devid; | |
44 | ||
45 | path = btrfs_alloc_path(); | |
46 | if (!path) { | |
47 | ret = -ENOMEM; | |
48 | goto out; | |
49 | } | |
50 | ||
51 | key.objectid = 0; | |
52 | key.type = BTRFS_DEV_REPLACE_KEY; | |
53 | key.offset = 0; | |
54 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
55 | if (ret) { | |
56 | no_valid_dev_replace_entry_found: | |
57 | ret = 0; | |
58 | dev_replace->replace_state = | |
59 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; | |
60 | dev_replace->cont_reading_from_srcdev_mode = | |
61 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
e93c89c1 SB |
62 | dev_replace->time_started = 0; |
63 | dev_replace->time_stopped = 0; | |
64 | atomic64_set(&dev_replace->num_write_errors, 0); | |
65 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
66 | dev_replace->cursor_left = 0; | |
67 | dev_replace->committed_cursor_left = 0; | |
68 | dev_replace->cursor_left_last_write_of_item = 0; | |
69 | dev_replace->cursor_right = 0; | |
70 | dev_replace->srcdev = NULL; | |
71 | dev_replace->tgtdev = NULL; | |
72 | dev_replace->is_valid = 0; | |
73 | dev_replace->item_needs_writeback = 0; | |
74 | goto out; | |
75 | } | |
76 | slot = path->slots[0]; | |
77 | eb = path->nodes[0]; | |
78 | item_size = btrfs_item_size_nr(eb, slot); | |
79 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); | |
80 | ||
81 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
efe120a0 FH |
82 | btrfs_warn(fs_info, |
83 | "dev_replace entry found has unexpected size, ignore entry"); | |
e93c89c1 SB |
84 | goto no_valid_dev_replace_entry_found; |
85 | } | |
86 | ||
87 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
88 | dev_replace->cont_reading_from_srcdev_mode = | |
89 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
90 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
91 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
92 | dev_replace->time_stopped = | |
93 | btrfs_dev_replace_time_stopped(eb, ptr); | |
94 | atomic64_set(&dev_replace->num_write_errors, | |
95 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
96 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
97 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
98 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
99 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
100 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
101 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
102 | dev_replace->is_valid = 1; | |
103 | ||
104 | dev_replace->item_needs_writeback = 0; | |
105 | switch (dev_replace->replace_state) { | |
106 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
107 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
108 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
109 | dev_replace->srcdev = NULL; | |
110 | dev_replace->tgtdev = NULL; | |
111 | break; | |
112 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
113 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
e4319cd9 AJ |
114 | dev_replace->srcdev = btrfs_find_device(fs_info->fs_devices, |
115 | src_devid, NULL, NULL); | |
116 | dev_replace->tgtdev = btrfs_find_device(fs_info->fs_devices, | |
e93c89c1 SB |
117 | BTRFS_DEV_REPLACE_DEVID, |
118 | NULL, NULL); | |
119 | /* | |
120 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
121 | * missing | |
122 | */ | |
123 | if (!dev_replace->srcdev && | |
0b246afa | 124 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 125 | ret = -EIO; |
efe120a0 FH |
126 | btrfs_warn(fs_info, |
127 | "cannot mount because device replace operation is ongoing and"); | |
128 | btrfs_warn(fs_info, | |
129 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
130 | src_devid); | |
e93c89c1 SB |
131 | } |
132 | if (!dev_replace->tgtdev && | |
0b246afa | 133 | !btrfs_test_opt(fs_info, DEGRADED)) { |
e93c89c1 | 134 | ret = -EIO; |
efe120a0 FH |
135 | btrfs_warn(fs_info, |
136 | "cannot mount because device replace operation is ongoing and"); | |
137 | btrfs_warn(fs_info, | |
138 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
6e71c47a | 139 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
140 | } |
141 | if (dev_replace->tgtdev) { | |
142 | if (dev_replace->srcdev) { | |
143 | dev_replace->tgtdev->total_bytes = | |
144 | dev_replace->srcdev->total_bytes; | |
145 | dev_replace->tgtdev->disk_total_bytes = | |
146 | dev_replace->srcdev->disk_total_bytes; | |
935e5cc9 MX |
147 | dev_replace->tgtdev->commit_total_bytes = |
148 | dev_replace->srcdev->commit_total_bytes; | |
e93c89c1 SB |
149 | dev_replace->tgtdev->bytes_used = |
150 | dev_replace->srcdev->bytes_used; | |
ce7213c7 MX |
151 | dev_replace->tgtdev->commit_bytes_used = |
152 | dev_replace->srcdev->commit_bytes_used; | |
e93c89c1 | 153 | } |
401e29c1 AJ |
154 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, |
155 | &dev_replace->tgtdev->dev_state); | |
15fc1283 AJ |
156 | |
157 | WARN_ON(fs_info->fs_devices->rw_devices == 0); | |
158 | dev_replace->tgtdev->io_width = fs_info->sectorsize; | |
159 | dev_replace->tgtdev->io_align = fs_info->sectorsize; | |
160 | dev_replace->tgtdev->sector_size = fs_info->sectorsize; | |
161 | dev_replace->tgtdev->fs_info = fs_info; | |
162 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, | |
163 | &dev_replace->tgtdev->dev_state); | |
e93c89c1 SB |
164 | } |
165 | break; | |
166 | } | |
167 | ||
168 | out: | |
527afb44 | 169 | btrfs_free_path(path); |
e93c89c1 SB |
170 | return ret; |
171 | } | |
172 | ||
d48f39d5 DS |
173 | /* |
174 | * Initialize a new device for device replace target from a given source dev | |
175 | * and path. | |
176 | * | |
177 | * Return 0 and new device in @device_out, otherwise return < 0 | |
178 | */ | |
179 | static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, | |
180 | const char *device_path, | |
181 | struct btrfs_device *srcdev, | |
182 | struct btrfs_device **device_out) | |
183 | { | |
184 | struct btrfs_device *device; | |
185 | struct block_device *bdev; | |
186 | struct list_head *devices; | |
187 | struct rcu_string *name; | |
188 | u64 devid = BTRFS_DEV_REPLACE_DEVID; | |
189 | int ret = 0; | |
190 | ||
191 | *device_out = NULL; | |
192 | if (fs_info->fs_devices->seeding) { | |
193 | btrfs_err(fs_info, "the filesystem is a seed filesystem!"); | |
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL, | |
198 | fs_info->bdev_holder); | |
199 | if (IS_ERR(bdev)) { | |
200 | btrfs_err(fs_info, "target device %s is invalid!", device_path); | |
201 | return PTR_ERR(bdev); | |
202 | } | |
203 | ||
204 | filemap_write_and_wait(bdev->bd_inode->i_mapping); | |
205 | ||
206 | devices = &fs_info->fs_devices->devices; | |
207 | list_for_each_entry(device, devices, dev_list) { | |
208 | if (device->bdev == bdev) { | |
209 | btrfs_err(fs_info, | |
210 | "target device is in the filesystem!"); | |
211 | ret = -EEXIST; | |
212 | goto error; | |
213 | } | |
214 | } | |
215 | ||
216 | ||
217 | if (i_size_read(bdev->bd_inode) < | |
218 | btrfs_device_get_total_bytes(srcdev)) { | |
219 | btrfs_err(fs_info, | |
220 | "target device is smaller than source device!"); | |
221 | ret = -EINVAL; | |
222 | goto error; | |
223 | } | |
224 | ||
225 | ||
226 | device = btrfs_alloc_device(NULL, &devid, NULL); | |
227 | if (IS_ERR(device)) { | |
228 | ret = PTR_ERR(device); | |
229 | goto error; | |
230 | } | |
231 | ||
232 | name = rcu_string_strdup(device_path, GFP_KERNEL); | |
233 | if (!name) { | |
234 | btrfs_free_device(device); | |
235 | ret = -ENOMEM; | |
236 | goto error; | |
237 | } | |
238 | rcu_assign_pointer(device->name, name); | |
239 | ||
240 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
241 | set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); | |
242 | device->generation = 0; | |
243 | device->io_width = fs_info->sectorsize; | |
244 | device->io_align = fs_info->sectorsize; | |
245 | device->sector_size = fs_info->sectorsize; | |
246 | device->total_bytes = btrfs_device_get_total_bytes(srcdev); | |
247 | device->disk_total_bytes = btrfs_device_get_disk_total_bytes(srcdev); | |
248 | device->bytes_used = btrfs_device_get_bytes_used(srcdev); | |
249 | device->commit_total_bytes = srcdev->commit_total_bytes; | |
250 | device->commit_bytes_used = device->bytes_used; | |
251 | device->fs_info = fs_info; | |
252 | device->bdev = bdev; | |
253 | set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); | |
254 | set_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); | |
255 | device->mode = FMODE_EXCL; | |
256 | device->dev_stats_valid = 1; | |
257 | set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE); | |
258 | device->fs_devices = fs_info->fs_devices; | |
259 | list_add(&device->dev_list, &fs_info->fs_devices->devices); | |
260 | fs_info->fs_devices->num_devices++; | |
261 | fs_info->fs_devices->open_devices++; | |
262 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
263 | ||
264 | *device_out = device; | |
265 | return 0; | |
266 | ||
267 | error: | |
268 | blkdev_put(bdev, FMODE_EXCL); | |
269 | return ret; | |
270 | } | |
271 | ||
e93c89c1 SB |
272 | /* |
273 | * called from commit_transaction. Writes changed device replace state to | |
274 | * disk. | |
275 | */ | |
276 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans, | |
277 | struct btrfs_fs_info *fs_info) | |
278 | { | |
279 | int ret; | |
280 | struct btrfs_root *dev_root = fs_info->dev_root; | |
281 | struct btrfs_path *path; | |
282 | struct btrfs_key key; | |
283 | struct extent_buffer *eb; | |
284 | struct btrfs_dev_replace_item *ptr; | |
285 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
286 | ||
cb5583dd | 287 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
288 | if (!dev_replace->is_valid || |
289 | !dev_replace->item_needs_writeback) { | |
cb5583dd | 290 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
291 | return 0; |
292 | } | |
cb5583dd | 293 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
294 | |
295 | key.objectid = 0; | |
296 | key.type = BTRFS_DEV_REPLACE_KEY; | |
297 | key.offset = 0; | |
298 | ||
299 | path = btrfs_alloc_path(); | |
300 | if (!path) { | |
301 | ret = -ENOMEM; | |
302 | goto out; | |
303 | } | |
304 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
305 | if (ret < 0) { | |
5d163e0e JM |
306 | btrfs_warn(fs_info, |
307 | "error %d while searching for dev_replace item!", | |
308 | ret); | |
e93c89c1 SB |
309 | goto out; |
310 | } | |
311 | ||
312 | if (ret == 0 && | |
313 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
314 | /* | |
315 | * need to delete old one and insert a new one. | |
316 | * Since no attempt is made to recover any old state, if the | |
317 | * dev_replace state is 'running', the data on the target | |
318 | * drive is lost. | |
319 | * It would be possible to recover the state: just make sure | |
320 | * that the beginning of the item is never changed and always | |
321 | * contains all the essential information. Then read this | |
322 | * minimal set of information and use it as a base for the | |
323 | * new state. | |
324 | */ | |
325 | ret = btrfs_del_item(trans, dev_root, path); | |
326 | if (ret != 0) { | |
5d163e0e JM |
327 | btrfs_warn(fs_info, |
328 | "delete too small dev_replace item failed %d!", | |
329 | ret); | |
e93c89c1 SB |
330 | goto out; |
331 | } | |
332 | ret = 1; | |
333 | } | |
334 | ||
335 | if (ret == 1) { | |
336 | /* need to insert a new item */ | |
337 | btrfs_release_path(path); | |
338 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
339 | &key, sizeof(*ptr)); | |
340 | if (ret < 0) { | |
5d163e0e JM |
341 | btrfs_warn(fs_info, |
342 | "insert dev_replace item failed %d!", ret); | |
e93c89c1 SB |
343 | goto out; |
344 | } | |
345 | } | |
346 | ||
347 | eb = path->nodes[0]; | |
348 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
349 | struct btrfs_dev_replace_item); | |
350 | ||
cb5583dd | 351 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
352 | if (dev_replace->srcdev) |
353 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
354 | dev_replace->srcdev->devid); | |
355 | else | |
356 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
357 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
358 | dev_replace->cont_reading_from_srcdev_mode); | |
359 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
360 | dev_replace->replace_state); | |
361 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
362 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
363 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
364 | atomic64_read(&dev_replace->num_write_errors)); | |
365 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
366 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
367 | dev_replace->cursor_left_last_write_of_item = | |
368 | dev_replace->cursor_left; | |
369 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
370 | dev_replace->cursor_left_last_write_of_item); | |
371 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
372 | dev_replace->cursor_right); | |
373 | dev_replace->item_needs_writeback = 0; | |
cb5583dd | 374 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
375 | |
376 | btrfs_mark_buffer_dirty(eb); | |
377 | ||
378 | out: | |
379 | btrfs_free_path(path); | |
380 | ||
381 | return ret; | |
382 | } | |
383 | ||
3c958bd2 AJ |
384 | static char* btrfs_dev_name(struct btrfs_device *device) |
385 | { | |
acf18c56 | 386 | if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) |
3c958bd2 AJ |
387 | return "<missing disk>"; |
388 | else | |
389 | return rcu_str_deref(device->name); | |
390 | } | |
391 | ||
54862d6d | 392 | static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
da353f6b DS |
393 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, |
394 | int read_src) | |
e93c89c1 | 395 | { |
2ff7e61e | 396 | struct btrfs_root *root = fs_info->dev_root; |
e93c89c1 | 397 | struct btrfs_trans_handle *trans; |
e93c89c1 SB |
398 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
399 | int ret; | |
400 | struct btrfs_device *tgt_device = NULL; | |
401 | struct btrfs_device *src_device = NULL; | |
aa144bfe | 402 | bool need_unlock; |
e93c89c1 | 403 | |
a27a94c2 NB |
404 | src_device = btrfs_find_device_by_devspec(fs_info, srcdevid, |
405 | srcdev_name); | |
406 | if (IS_ERR(src_device)) | |
407 | return PTR_ERR(src_device); | |
e93c89c1 | 408 | |
eede2bf3 OS |
409 | if (btrfs_pinned_by_swapfile(fs_info, src_device)) { |
410 | btrfs_warn_in_rcu(fs_info, | |
411 | "cannot replace device %s (devid %llu) due to active swapfile", | |
412 | btrfs_dev_name(src_device), src_device->devid); | |
413 | return -ETXTBSY; | |
414 | } | |
415 | ||
2ff7e61e | 416 | ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name, |
1c43366d | 417 | src_device, &tgt_device); |
1c43366d MX |
418 | if (ret) |
419 | return ret; | |
e93c89c1 | 420 | |
9e271ae2 AJ |
421 | /* |
422 | * Here we commit the transaction to make sure commit_total_bytes | |
423 | * of all the devices are updated. | |
424 | */ | |
425 | trans = btrfs_attach_transaction(root); | |
426 | if (!IS_ERR(trans)) { | |
3a45bb20 | 427 | ret = btrfs_commit_transaction(trans); |
9e271ae2 AJ |
428 | if (ret) |
429 | return ret; | |
430 | } else if (PTR_ERR(trans) != -ENOENT) { | |
431 | return PTR_ERR(trans); | |
432 | } | |
433 | ||
aa144bfe | 434 | need_unlock = true; |
cb5583dd | 435 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
436 | switch (dev_replace->replace_state) { |
437 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
438 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
439 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
440 | break; | |
441 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
442 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
5c061471 | 443 | ASSERT(0); |
b5255456 | 444 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
e93c89c1 SB |
445 | goto leave; |
446 | } | |
447 | ||
b5255456 | 448 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
e93c89c1 SB |
449 | WARN_ON(!src_device); |
450 | dev_replace->srcdev = src_device; | |
e93c89c1 SB |
451 | dev_replace->tgtdev = tgt_device; |
452 | ||
fc23c246 | 453 | btrfs_info_in_rcu(fs_info, |
ecaeb14b | 454 | "dev_replace from %s (devid %llu) to %s started", |
3c958bd2 | 455 | btrfs_dev_name(src_device), |
e93c89c1 SB |
456 | src_device->devid, |
457 | rcu_str_deref(tgt_device->name)); | |
458 | ||
e93c89c1 SB |
459 | /* |
460 | * from now on, the writes to the srcdev are all duplicated to | |
461 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
462 | */ | |
463 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
a944442c | 464 | dev_replace->time_started = ktime_get_real_seconds(); |
e93c89c1 SB |
465 | dev_replace->cursor_left = 0; |
466 | dev_replace->committed_cursor_left = 0; | |
467 | dev_replace->cursor_left_last_write_of_item = 0; | |
468 | dev_replace->cursor_right = 0; | |
469 | dev_replace->is_valid = 1; | |
470 | dev_replace->item_needs_writeback = 1; | |
7ccefb98 YK |
471 | atomic64_set(&dev_replace->num_write_errors, 0); |
472 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
cb5583dd | 473 | up_write(&dev_replace->rwsem); |
aa144bfe | 474 | need_unlock = false; |
e93c89c1 | 475 | |
73416dab LB |
476 | ret = btrfs_sysfs_add_device_link(tgt_device->fs_devices, tgt_device); |
477 | if (ret) | |
ab8d0fc4 | 478 | btrfs_err(fs_info, "kobj add dev failed %d", ret); |
73416dab | 479 | |
6374e57a | 480 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 SB |
481 | |
482 | /* force writing the updated state information to disk */ | |
483 | trans = btrfs_start_transaction(root, 0); | |
484 | if (IS_ERR(trans)) { | |
485 | ret = PTR_ERR(trans); | |
aa144bfe | 486 | need_unlock = true; |
cb5583dd | 487 | down_write(&dev_replace->rwsem); |
5c061471 JM |
488 | dev_replace->replace_state = |
489 | BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED; | |
490 | dev_replace->srcdev = NULL; | |
491 | dev_replace->tgtdev = NULL; | |
e93c89c1 SB |
492 | goto leave; |
493 | } | |
494 | ||
3a45bb20 | 495 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
496 | WARN_ON(ret); |
497 | ||
498 | /* the disk copy procedure reuses the scrub code */ | |
499 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
7cc8e58d | 500 | btrfs_device_get_total_bytes(src_device), |
e93c89c1 SB |
501 | &dev_replace->scrub_progress, 0, 1); |
502 | ||
fc23c246 | 503 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
2fc9f6ba | 504 | if (ret == -EINPROGRESS) { |
b5255456 | 505 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
49365e69 | 506 | } else if (ret != -ECANCELED) { |
2fc9f6ba EG |
507 | WARN_ON(ret); |
508 | } | |
e93c89c1 | 509 | |
2fc9f6ba | 510 | return ret; |
e93c89c1 SB |
511 | |
512 | leave: | |
aa144bfe | 513 | if (need_unlock) |
cb5583dd | 514 | up_write(&dev_replace->rwsem); |
4f5ad7bd | 515 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
e93c89c1 SB |
516 | return ret; |
517 | } | |
518 | ||
2ff7e61e | 519 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
b5255456 AJ |
520 | struct btrfs_ioctl_dev_replace_args *args) |
521 | { | |
522 | int ret; | |
523 | ||
524 | switch (args->start.cont_reading_from_srcdev_mode) { | |
525 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
526 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
527 | break; | |
528 | default: | |
529 | return -EINVAL; | |
530 | } | |
531 | ||
532 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
533 | args->start.tgtdev_name[0] == '\0') | |
534 | return -EINVAL; | |
535 | ||
2ff7e61e | 536 | ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name, |
b5255456 AJ |
537 | args->start.srcdevid, |
538 | args->start.srcdev_name, | |
539 | args->start.cont_reading_from_srcdev_mode); | |
540 | args->result = ret; | |
541 | /* don't warn if EINPROGRESS, someone else might be running scrub */ | |
53e62fb5 AJ |
542 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS || |
543 | ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR) | |
544 | return 0; | |
b5255456 AJ |
545 | |
546 | return ret; | |
547 | } | |
548 | ||
c404e0dc | 549 | /* |
01327610 | 550 | * blocked until all in-flight bios operations are finished. |
c404e0dc MX |
551 | */ |
552 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
553 | { | |
c404e0dc | 554 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
7f8d236a DS |
555 | wait_event(fs_info->dev_replace.replace_wait, !percpu_counter_sum( |
556 | &fs_info->dev_replace.bio_counter)); | |
c404e0dc MX |
557 | } |
558 | ||
559 | /* | |
560 | * we have removed target device, it is safe to allow new bios request. | |
561 | */ | |
562 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
563 | { | |
564 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
7f8d236a | 565 | wake_up(&fs_info->dev_replace.replace_wait); |
c404e0dc MX |
566 | } |
567 | ||
e93c89c1 SB |
568 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
569 | int scrub_ret) | |
570 | { | |
571 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
572 | struct btrfs_device *tgt_device; | |
573 | struct btrfs_device *src_device; | |
574 | struct btrfs_root *root = fs_info->tree_root; | |
575 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
576 | struct btrfs_trans_handle *trans; | |
577 | int ret = 0; | |
578 | ||
579 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
580 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
581 | ||
cb5583dd | 582 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
583 | /* was the operation canceled, or is it finished? */ |
584 | if (dev_replace->replace_state != | |
585 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
cb5583dd | 586 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
587 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
588 | return 0; | |
589 | } | |
590 | ||
591 | tgt_device = dev_replace->tgtdev; | |
592 | src_device = dev_replace->srcdev; | |
cb5583dd | 593 | up_read(&dev_replace->rwsem); |
e93c89c1 | 594 | |
e93c89c1 SB |
595 | /* |
596 | * flush all outstanding I/O and inode extent mappings before the | |
597 | * copy operation is declared as being finished | |
598 | */ | |
82b3e53b | 599 | ret = btrfs_start_delalloc_roots(fs_info, -1); |
3edb2a68 MX |
600 | if (ret) { |
601 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
602 | return ret; | |
603 | } | |
6374e57a | 604 | btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
e93c89c1 SB |
605 | |
606 | trans = btrfs_start_transaction(root, 0); | |
607 | if (IS_ERR(trans)) { | |
608 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
609 | return PTR_ERR(trans); | |
610 | } | |
3a45bb20 | 611 | ret = btrfs_commit_transaction(trans); |
e93c89c1 SB |
612 | WARN_ON(ret); |
613 | ||
614 | /* keep away write_all_supers() during the finishing procedure */ | |
0b246afa JM |
615 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
616 | mutex_lock(&fs_info->chunk_mutex); | |
cb5583dd | 617 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
618 | dev_replace->replace_state = |
619 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
620 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
621 | dev_replace->tgtdev = NULL; | |
622 | dev_replace->srcdev = NULL; | |
a944442c | 623 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 SB |
624 | dev_replace->item_needs_writeback = 1; |
625 | ||
c404e0dc MX |
626 | /* replace old device with new one in mapping tree */ |
627 | if (!scrub_ret) { | |
628 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, | |
629 | src_device, | |
630 | tgt_device); | |
631 | } else { | |
f9085abf AJ |
632 | if (scrub_ret != -ECANCELED) |
633 | btrfs_err_in_rcu(fs_info, | |
0b246afa | 634 | "btrfs_scrub_dev(%s, %llu, %s) failed %d", |
3c958bd2 | 635 | btrfs_dev_name(src_device), |
0b246afa JM |
636 | src_device->devid, |
637 | rcu_str_deref(tgt_device->name), scrub_ret); | |
cb5583dd | 638 | up_write(&dev_replace->rwsem); |
0b246afa JM |
639 | mutex_unlock(&fs_info->chunk_mutex); |
640 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
ae6529c3 | 641 | btrfs_rm_dev_replace_blocked(fs_info); |
e93c89c1 | 642 | if (tgt_device) |
4f5ad7bd | 643 | btrfs_destroy_dev_replace_tgtdev(tgt_device); |
ae6529c3 | 644 | btrfs_rm_dev_replace_unblocked(fs_info); |
e93c89c1 SB |
645 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
646 | ||
2fc9f6ba | 647 | return scrub_ret; |
e93c89c1 SB |
648 | } |
649 | ||
0b246afa JM |
650 | btrfs_info_in_rcu(fs_info, |
651 | "dev_replace from %s (devid %llu) to %s finished", | |
3c958bd2 | 652 | btrfs_dev_name(src_device), |
0b246afa JM |
653 | src_device->devid, |
654 | rcu_str_deref(tgt_device->name)); | |
401e29c1 | 655 | clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &tgt_device->dev_state); |
e93c89c1 SB |
656 | tgt_device->devid = src_device->devid; |
657 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
e93c89c1 SB |
658 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
659 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
660 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
7cc8e58d MX |
661 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
662 | btrfs_device_set_disk_total_bytes(tgt_device, | |
663 | src_device->disk_total_bytes); | |
664 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); | |
935e5cc9 MX |
665 | ASSERT(list_empty(&src_device->resized_list)); |
666 | tgt_device->commit_total_bytes = src_device->commit_total_bytes; | |
ce7213c7 | 667 | tgt_device->commit_bytes_used = src_device->bytes_used; |
88acff64 | 668 | |
d6507cf1 | 669 | btrfs_assign_next_active_device(src_device, tgt_device); |
88acff64 | 670 | |
e93c89c1 | 671 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); |
82372bc8 | 672 | fs_info->fs_devices->rw_devices++; |
e93c89c1 | 673 | |
cb5583dd | 674 | up_write(&dev_replace->rwsem); |
c404e0dc MX |
675 | btrfs_rm_dev_replace_blocked(fs_info); |
676 | ||
68a9db5f | 677 | btrfs_rm_dev_replace_remove_srcdev(src_device); |
1357272f | 678 | |
c404e0dc MX |
679 | btrfs_rm_dev_replace_unblocked(fs_info); |
680 | ||
1e7e1f9e MT |
681 | /* |
682 | * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will | |
683 | * update on-disk dev stats value during commit transaction | |
684 | */ | |
685 | atomic_inc(&tgt_device->dev_stats_ccnt); | |
686 | ||
e93c89c1 SB |
687 | /* |
688 | * this is again a consistent state where no dev_replace procedure | |
689 | * is running, the target device is part of the filesystem, the | |
690 | * source device is not part of the filesystem anymore and its 1st | |
691 | * superblock is scratched out so that it is no longer marked to | |
692 | * belong to this filesystem. | |
693 | */ | |
0b246afa JM |
694 | mutex_unlock(&fs_info->chunk_mutex); |
695 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
e93c89c1 | 696 | |
084b6e7c | 697 | /* replace the sysfs entry */ |
32576040 | 698 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, src_device); |
084b6e7c QW |
699 | btrfs_rm_dev_replace_free_srcdev(fs_info, src_device); |
700 | ||
e93c89c1 SB |
701 | /* write back the superblocks */ |
702 | trans = btrfs_start_transaction(root, 0); | |
703 | if (!IS_ERR(trans)) | |
3a45bb20 | 704 | btrfs_commit_transaction(trans); |
e93c89c1 SB |
705 | |
706 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
712 | struct btrfs_fs_info *fs_info, | |
713 | struct btrfs_device *srcdev, | |
714 | struct btrfs_device *tgtdev) | |
715 | { | |
716 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; | |
717 | struct extent_map *em; | |
718 | struct map_lookup *map; | |
719 | u64 start = 0; | |
720 | int i; | |
721 | ||
722 | write_lock(&em_tree->lock); | |
723 | do { | |
724 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
725 | if (!em) | |
726 | break; | |
95617d69 | 727 | map = em->map_lookup; |
e93c89c1 SB |
728 | for (i = 0; i < map->num_stripes; i++) |
729 | if (srcdev == map->stripes[i].dev) | |
730 | map->stripes[i].dev = tgtdev; | |
731 | start = em->start + em->len; | |
732 | free_extent_map(em); | |
733 | } while (start); | |
734 | write_unlock(&em_tree->lock); | |
735 | } | |
736 | ||
74b595fe DS |
737 | /* |
738 | * Read progress of device replace status according to the state and last | |
739 | * stored position. The value format is the same as for | |
740 | * btrfs_dev_replace::progress_1000 | |
741 | */ | |
742 | static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info) | |
743 | { | |
744 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
745 | u64 ret = 0; | |
746 | ||
747 | switch (dev_replace->replace_state) { | |
748 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
749 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
750 | ret = 0; | |
751 | break; | |
752 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
753 | ret = 1000; | |
754 | break; | |
755 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
756 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
757 | ret = div64_u64(dev_replace->cursor_left, | |
758 | div_u64(btrfs_device_get_total_bytes( | |
759 | dev_replace->srcdev), 1000)); | |
760 | break; | |
761 | } | |
762 | ||
763 | return ret; | |
764 | } | |
765 | ||
e93c89c1 SB |
766 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
767 | struct btrfs_ioctl_dev_replace_args *args) | |
768 | { | |
769 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
770 | ||
cb5583dd | 771 | down_read(&dev_replace->rwsem); |
e93c89c1 SB |
772 | /* even if !dev_replace_is_valid, the values are good enough for |
773 | * the replace_status ioctl */ | |
774 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
775 | args->status.replace_state = dev_replace->replace_state; | |
776 | args->status.time_started = dev_replace->time_started; | |
777 | args->status.time_stopped = dev_replace->time_stopped; | |
778 | args->status.num_write_errors = | |
779 | atomic64_read(&dev_replace->num_write_errors); | |
780 | args->status.num_uncorrectable_read_errors = | |
781 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
74b595fe | 782 | args->status.progress_1000 = btrfs_dev_replace_progress(fs_info); |
cb5583dd | 783 | up_read(&dev_replace->rwsem); |
e93c89c1 SB |
784 | } |
785 | ||
18e67c73 | 786 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
e93c89c1 SB |
787 | { |
788 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
789 | struct btrfs_device *tgt_device = NULL; | |
8f2ceaa7 | 790 | struct btrfs_device *src_device = NULL; |
e93c89c1 SB |
791 | struct btrfs_trans_handle *trans; |
792 | struct btrfs_root *root = fs_info->tree_root; | |
18e67c73 | 793 | int result; |
e93c89c1 SB |
794 | int ret; |
795 | ||
bc98a42c | 796 | if (sb_rdonly(fs_info->sb)) |
e649e587 ID |
797 | return -EROFS; |
798 | ||
e93c89c1 | 799 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
cb5583dd | 800 | down_write(&dev_replace->rwsem); |
e93c89c1 SB |
801 | switch (dev_replace->replace_state) { |
802 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
803 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
804 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
805 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
cb5583dd | 806 | up_write(&dev_replace->rwsem); |
d189dd70 | 807 | break; |
e93c89c1 | 808 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
d189dd70 AJ |
809 | tgt_device = dev_replace->tgtdev; |
810 | src_device = dev_replace->srcdev; | |
cb5583dd | 811 | up_write(&dev_replace->rwsem); |
b47dda2e AJ |
812 | ret = btrfs_scrub_cancel(fs_info); |
813 | if (ret < 0) { | |
814 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
815 | } else { | |
816 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
817 | /* | |
818 | * btrfs_dev_replace_finishing() will handle the | |
819 | * cleanup part | |
820 | */ | |
821 | btrfs_info_in_rcu(fs_info, | |
822 | "dev_replace from %s (devid %llu) to %s canceled", | |
823 | btrfs_dev_name(src_device), src_device->devid, | |
824 | btrfs_dev_name(tgt_device)); | |
825 | } | |
d189dd70 | 826 | break; |
e93c89c1 | 827 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
d189dd70 AJ |
828 | /* |
829 | * Scrub doing the replace isn't running so we need to do the | |
830 | * cleanup step of btrfs_dev_replace_finishing() here | |
831 | */ | |
e93c89c1 SB |
832 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
833 | tgt_device = dev_replace->tgtdev; | |
8f2ceaa7 | 834 | src_device = dev_replace->srcdev; |
e93c89c1 SB |
835 | dev_replace->tgtdev = NULL; |
836 | dev_replace->srcdev = NULL; | |
d189dd70 AJ |
837 | dev_replace->replace_state = |
838 | BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
839 | dev_replace->time_stopped = ktime_get_real_seconds(); | |
840 | dev_replace->item_needs_writeback = 1; | |
e93c89c1 | 841 | |
cb5583dd | 842 | up_write(&dev_replace->rwsem); |
8f2ceaa7 | 843 | |
fe97e2e1 AJ |
844 | /* Scrub for replace must not be running in suspended state */ |
845 | ret = btrfs_scrub_cancel(fs_info); | |
846 | ASSERT(ret != -ENOTCONN); | |
d189dd70 AJ |
847 | |
848 | trans = btrfs_start_transaction(root, 0); | |
849 | if (IS_ERR(trans)) { | |
850 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
851 | return PTR_ERR(trans); | |
852 | } | |
853 | ret = btrfs_commit_transaction(trans); | |
854 | WARN_ON(ret); | |
8f2ceaa7 | 855 | |
d189dd70 AJ |
856 | btrfs_info_in_rcu(fs_info, |
857 | "suspended dev_replace from %s (devid %llu) to %s canceled", | |
858 | btrfs_dev_name(src_device), src_device->devid, | |
859 | btrfs_dev_name(tgt_device)); | |
860 | ||
861 | if (tgt_device) | |
862 | btrfs_destroy_dev_replace_tgtdev(tgt_device); | |
863 | break; | |
864 | default: | |
865 | result = -EINVAL; | |
866 | } | |
e93c89c1 | 867 | |
e93c89c1 SB |
868 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
869 | return result; | |
870 | } | |
871 | ||
872 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
873 | { | |
874 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
875 | ||
876 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
cb5583dd DS |
877 | down_write(&dev_replace->rwsem); |
878 | ||
e93c89c1 SB |
879 | switch (dev_replace->replace_state) { |
880 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
881 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
882 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
883 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
884 | break; | |
885 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
886 | dev_replace->replace_state = | |
887 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
a944442c | 888 | dev_replace->time_stopped = ktime_get_real_seconds(); |
e93c89c1 | 889 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 890 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
891 | break; |
892 | } | |
893 | ||
cb5583dd | 894 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
895 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
896 | } | |
897 | ||
898 | /* resume dev_replace procedure that was interrupted by unmount */ | |
899 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
900 | { | |
901 | struct task_struct *task; | |
902 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
903 | ||
cb5583dd DS |
904 | down_write(&dev_replace->rwsem); |
905 | ||
e93c89c1 SB |
906 | switch (dev_replace->replace_state) { |
907 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
908 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
909 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
cb5583dd | 910 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
911 | return 0; |
912 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
913 | break; | |
914 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
915 | dev_replace->replace_state = | |
916 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
917 | break; | |
918 | } | |
919 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 | 920 | btrfs_info(fs_info, |
5d163e0e JM |
921 | "cannot continue dev_replace, tgtdev is missing"); |
922 | btrfs_info(fs_info, | |
923 | "you may cancel the operation after 'mount -o degraded'"); | |
0d228ece AJ |
924 | dev_replace->replace_state = |
925 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 926 | up_write(&dev_replace->rwsem); |
e93c89c1 SB |
927 | return 0; |
928 | } | |
cb5583dd | 929 | up_write(&dev_replace->rwsem); |
e93c89c1 | 930 | |
010a47bd DS |
931 | /* |
932 | * This could collide with a paused balance, but the exclusive op logic | |
933 | * should never allow both to start and pause. We don't want to allow | |
934 | * dev-replace to start anyway. | |
935 | */ | |
936 | if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { | |
cb5583dd | 937 | down_write(&dev_replace->rwsem); |
05c49e6b AJ |
938 | dev_replace->replace_state = |
939 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
cb5583dd | 940 | up_write(&dev_replace->rwsem); |
010a47bd DS |
941 | btrfs_info(fs_info, |
942 | "cannot resume dev-replace, other exclusive operation running"); | |
943 | return 0; | |
944 | } | |
945 | ||
e93c89c1 | 946 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
8c6ffba0 | 947 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
948 | } |
949 | ||
950 | static int btrfs_dev_replace_kthread(void *data) | |
951 | { | |
952 | struct btrfs_fs_info *fs_info = data; | |
953 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
e93c89c1 | 954 | u64 progress; |
00251a52 | 955 | int ret; |
e93c89c1 | 956 | |
f1b8a1e8 DS |
957 | progress = btrfs_dev_replace_progress(fs_info); |
958 | progress = div_u64(progress, 10); | |
959 | btrfs_info_in_rcu(fs_info, | |
3c958bd2 AJ |
960 | "continuing dev_replace from %s (devid %llu) to target %s @%u%%", |
961 | btrfs_dev_name(dev_replace->srcdev), | |
f1b8a1e8 | 962 | dev_replace->srcdev->devid, |
3c958bd2 | 963 | btrfs_dev_name(dev_replace->tgtdev), |
f1b8a1e8 DS |
964 | (unsigned int)progress); |
965 | ||
e93c89c1 SB |
966 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
967 | dev_replace->committed_cursor_left, | |
7cc8e58d | 968 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
e93c89c1 SB |
969 | &dev_replace->scrub_progress, 0, 1); |
970 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
49365e69 | 971 | WARN_ON(ret && ret != -ECANCELED); |
00251a52 DS |
972 | |
973 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); | |
e93c89c1 SB |
974 | return 0; |
975 | } | |
976 | ||
977 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) | |
978 | { | |
979 | if (!dev_replace->is_valid) | |
980 | return 0; | |
981 | ||
982 | switch (dev_replace->replace_state) { | |
983 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
984 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
985 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
986 | return 0; | |
987 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
988 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
989 | /* | |
990 | * return true even if tgtdev is missing (this is | |
991 | * something that can happen if the dev_replace | |
992 | * procedure is suspended by an umount and then | |
993 | * the tgtdev is missing (or "btrfs dev scan") was | |
52042d8e | 994 | * not called and the filesystem is remounted |
e93c89c1 SB |
995 | * in degraded state. This does not stop the |
996 | * dev_replace procedure. It needs to be canceled | |
bb7ab3b9 | 997 | * manually if the cancellation is wanted. |
e93c89c1 SB |
998 | */ |
999 | break; | |
1000 | } | |
1001 | return 1; | |
1002 | } | |
1003 | ||
c404e0dc MX |
1004 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) |
1005 | { | |
7f8d236a | 1006 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
c404e0dc MX |
1007 | } |
1008 | ||
4245215d | 1009 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
c404e0dc | 1010 | { |
7f8d236a DS |
1011 | percpu_counter_sub(&fs_info->dev_replace.bio_counter, amount); |
1012 | cond_wake_up_nomb(&fs_info->dev_replace.replace_wait); | |
c404e0dc MX |
1013 | } |
1014 | ||
1015 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
1016 | { | |
09dd7a01 | 1017 | while (1) { |
7f8d236a | 1018 | percpu_counter_inc(&fs_info->dev_replace.bio_counter); |
09dd7a01 ZL |
1019 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1020 | &fs_info->fs_state))) | |
1021 | break; | |
1022 | ||
c404e0dc | 1023 | btrfs_bio_counter_dec(fs_info); |
7f8d236a | 1024 | wait_event(fs_info->dev_replace.replace_wait, |
c404e0dc MX |
1025 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
1026 | &fs_info->fs_state)); | |
c404e0dc | 1027 | } |
c404e0dc | 1028 | } |