Commit | Line | Data |
---|---|---|
e93c89c1 SB |
1 | /* |
2 | * Copyright (C) STRATO AG 2012. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | #include <linux/sched.h> | |
19 | #include <linux/bio.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/blkdev.h> | |
23 | #include <linux/random.h> | |
24 | #include <linux/iocontext.h> | |
25 | #include <linux/capability.h> | |
26 | #include <linux/kthread.h> | |
27 | #include <linux/math64.h> | |
28 | #include <asm/div64.h> | |
29 | #include "compat.h" | |
30 | #include "ctree.h" | |
31 | #include "extent_map.h" | |
32 | #include "disk-io.h" | |
33 | #include "transaction.h" | |
34 | #include "print-tree.h" | |
35 | #include "volumes.h" | |
36 | #include "async-thread.h" | |
37 | #include "check-integrity.h" | |
38 | #include "rcu-string.h" | |
39 | #include "dev-replace.h" | |
40 | ||
41 | static u64 btrfs_get_seconds_since_1970(void); | |
42 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, | |
43 | int scrub_ret); | |
44 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
45 | struct btrfs_fs_info *fs_info, | |
46 | struct btrfs_device *srcdev, | |
47 | struct btrfs_device *tgtdev); | |
48 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, | |
49 | char *srcdev_name, | |
50 | struct btrfs_device **device); | |
51 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); | |
52 | static int btrfs_dev_replace_kthread(void *data); | |
53 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); | |
54 | ||
55 | ||
56 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
57 | { | |
58 | struct btrfs_key key; | |
59 | struct btrfs_root *dev_root = fs_info->dev_root; | |
60 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
61 | struct extent_buffer *eb; | |
62 | int slot; | |
63 | int ret = 0; | |
64 | struct btrfs_path *path = NULL; | |
65 | int item_size; | |
66 | struct btrfs_dev_replace_item *ptr; | |
67 | u64 src_devid; | |
68 | ||
69 | path = btrfs_alloc_path(); | |
70 | if (!path) { | |
71 | ret = -ENOMEM; | |
72 | goto out; | |
73 | } | |
74 | ||
75 | key.objectid = 0; | |
76 | key.type = BTRFS_DEV_REPLACE_KEY; | |
77 | key.offset = 0; | |
78 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
79 | if (ret) { | |
80 | no_valid_dev_replace_entry_found: | |
81 | ret = 0; | |
82 | dev_replace->replace_state = | |
83 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; | |
84 | dev_replace->cont_reading_from_srcdev_mode = | |
85 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
86 | dev_replace->replace_state = 0; | |
87 | dev_replace->time_started = 0; | |
88 | dev_replace->time_stopped = 0; | |
89 | atomic64_set(&dev_replace->num_write_errors, 0); | |
90 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
91 | dev_replace->cursor_left = 0; | |
92 | dev_replace->committed_cursor_left = 0; | |
93 | dev_replace->cursor_left_last_write_of_item = 0; | |
94 | dev_replace->cursor_right = 0; | |
95 | dev_replace->srcdev = NULL; | |
96 | dev_replace->tgtdev = NULL; | |
97 | dev_replace->is_valid = 0; | |
98 | dev_replace->item_needs_writeback = 0; | |
99 | goto out; | |
100 | } | |
101 | slot = path->slots[0]; | |
102 | eb = path->nodes[0]; | |
103 | item_size = btrfs_item_size_nr(eb, slot); | |
104 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); | |
105 | ||
106 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
107 | pr_warn("btrfs: dev_replace entry found has unexpected size, ignore entry\n"); | |
108 | goto no_valid_dev_replace_entry_found; | |
109 | } | |
110 | ||
111 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
112 | dev_replace->cont_reading_from_srcdev_mode = | |
113 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
114 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
115 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
116 | dev_replace->time_stopped = | |
117 | btrfs_dev_replace_time_stopped(eb, ptr); | |
118 | atomic64_set(&dev_replace->num_write_errors, | |
119 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
120 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
121 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
122 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
123 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
124 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
125 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
126 | dev_replace->is_valid = 1; | |
127 | ||
128 | dev_replace->item_needs_writeback = 0; | |
129 | switch (dev_replace->replace_state) { | |
130 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
131 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
132 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
133 | dev_replace->srcdev = NULL; | |
134 | dev_replace->tgtdev = NULL; | |
135 | break; | |
136 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
137 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
138 | dev_replace->srcdev = btrfs_find_device(fs_info, src_devid, | |
139 | NULL, NULL); | |
140 | dev_replace->tgtdev = btrfs_find_device(fs_info, | |
141 | BTRFS_DEV_REPLACE_DEVID, | |
142 | NULL, NULL); | |
143 | /* | |
144 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
145 | * missing | |
146 | */ | |
147 | if (!dev_replace->srcdev && | |
148 | !btrfs_test_opt(dev_root, DEGRADED)) { | |
149 | ret = -EIO; | |
150 | pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?\n", | |
151 | (unsigned long long)src_devid); | |
152 | } | |
153 | if (!dev_replace->tgtdev && | |
154 | !btrfs_test_opt(dev_root, DEGRADED)) { | |
155 | ret = -EIO; | |
156 | pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "tgtdev (devid %llu) is missing, need to run btrfs dev scan?\n", | |
157 | (unsigned long long)BTRFS_DEV_REPLACE_DEVID); | |
158 | } | |
159 | if (dev_replace->tgtdev) { | |
160 | if (dev_replace->srcdev) { | |
161 | dev_replace->tgtdev->total_bytes = | |
162 | dev_replace->srcdev->total_bytes; | |
163 | dev_replace->tgtdev->disk_total_bytes = | |
164 | dev_replace->srcdev->disk_total_bytes; | |
165 | dev_replace->tgtdev->bytes_used = | |
166 | dev_replace->srcdev->bytes_used; | |
167 | } | |
168 | dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1; | |
169 | btrfs_init_dev_replace_tgtdev_for_resume(fs_info, | |
170 | dev_replace->tgtdev); | |
171 | } | |
172 | break; | |
173 | } | |
174 | ||
175 | out: | |
176 | if (path) | |
177 | btrfs_free_path(path); | |
178 | return ret; | |
179 | } | |
180 | ||
181 | /* | |
182 | * called from commit_transaction. Writes changed device replace state to | |
183 | * disk. | |
184 | */ | |
185 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans, | |
186 | struct btrfs_fs_info *fs_info) | |
187 | { | |
188 | int ret; | |
189 | struct btrfs_root *dev_root = fs_info->dev_root; | |
190 | struct btrfs_path *path; | |
191 | struct btrfs_key key; | |
192 | struct extent_buffer *eb; | |
193 | struct btrfs_dev_replace_item *ptr; | |
194 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
195 | ||
196 | btrfs_dev_replace_lock(dev_replace); | |
197 | if (!dev_replace->is_valid || | |
198 | !dev_replace->item_needs_writeback) { | |
199 | btrfs_dev_replace_unlock(dev_replace); | |
200 | return 0; | |
201 | } | |
202 | btrfs_dev_replace_unlock(dev_replace); | |
203 | ||
204 | key.objectid = 0; | |
205 | key.type = BTRFS_DEV_REPLACE_KEY; | |
206 | key.offset = 0; | |
207 | ||
208 | path = btrfs_alloc_path(); | |
209 | if (!path) { | |
210 | ret = -ENOMEM; | |
211 | goto out; | |
212 | } | |
213 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
214 | if (ret < 0) { | |
215 | pr_warn("btrfs: error %d while searching for dev_replace item!\n", | |
216 | ret); | |
217 | goto out; | |
218 | } | |
219 | ||
220 | if (ret == 0 && | |
221 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
222 | /* | |
223 | * need to delete old one and insert a new one. | |
224 | * Since no attempt is made to recover any old state, if the | |
225 | * dev_replace state is 'running', the data on the target | |
226 | * drive is lost. | |
227 | * It would be possible to recover the state: just make sure | |
228 | * that the beginning of the item is never changed and always | |
229 | * contains all the essential information. Then read this | |
230 | * minimal set of information and use it as a base for the | |
231 | * new state. | |
232 | */ | |
233 | ret = btrfs_del_item(trans, dev_root, path); | |
234 | if (ret != 0) { | |
235 | pr_warn("btrfs: delete too small dev_replace item failed %d!\n", | |
236 | ret); | |
237 | goto out; | |
238 | } | |
239 | ret = 1; | |
240 | } | |
241 | ||
242 | if (ret == 1) { | |
243 | /* need to insert a new item */ | |
244 | btrfs_release_path(path); | |
245 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
246 | &key, sizeof(*ptr)); | |
247 | if (ret < 0) { | |
248 | pr_warn("btrfs: insert dev_replace item failed %d!\n", | |
249 | ret); | |
250 | goto out; | |
251 | } | |
252 | } | |
253 | ||
254 | eb = path->nodes[0]; | |
255 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
256 | struct btrfs_dev_replace_item); | |
257 | ||
258 | btrfs_dev_replace_lock(dev_replace); | |
259 | if (dev_replace->srcdev) | |
260 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
261 | dev_replace->srcdev->devid); | |
262 | else | |
263 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
264 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
265 | dev_replace->cont_reading_from_srcdev_mode); | |
266 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
267 | dev_replace->replace_state); | |
268 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
269 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
270 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
271 | atomic64_read(&dev_replace->num_write_errors)); | |
272 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
273 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
274 | dev_replace->cursor_left_last_write_of_item = | |
275 | dev_replace->cursor_left; | |
276 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
277 | dev_replace->cursor_left_last_write_of_item); | |
278 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
279 | dev_replace->cursor_right); | |
280 | dev_replace->item_needs_writeback = 0; | |
281 | btrfs_dev_replace_unlock(dev_replace); | |
282 | ||
283 | btrfs_mark_buffer_dirty(eb); | |
284 | ||
285 | out: | |
286 | btrfs_free_path(path); | |
287 | ||
288 | return ret; | |
289 | } | |
290 | ||
291 | void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) | |
292 | { | |
293 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
294 | ||
295 | dev_replace->committed_cursor_left = | |
296 | dev_replace->cursor_left_last_write_of_item; | |
297 | } | |
298 | ||
299 | static u64 btrfs_get_seconds_since_1970(void) | |
300 | { | |
301 | struct timespec t = CURRENT_TIME_SEC; | |
302 | ||
303 | return t.tv_sec; | |
304 | } | |
305 | ||
306 | int btrfs_dev_replace_start(struct btrfs_root *root, | |
307 | struct btrfs_ioctl_dev_replace_args *args) | |
308 | { | |
309 | struct btrfs_trans_handle *trans; | |
310 | struct btrfs_fs_info *fs_info = root->fs_info; | |
311 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
312 | int ret; | |
313 | struct btrfs_device *tgt_device = NULL; | |
314 | struct btrfs_device *src_device = NULL; | |
315 | ||
316 | switch (args->start.cont_reading_from_srcdev_mode) { | |
317 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
318 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
319 | break; | |
320 | default: | |
321 | return -EINVAL; | |
322 | } | |
323 | ||
324 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
325 | args->start.tgtdev_name[0] == '\0') | |
326 | return -EINVAL; | |
327 | ||
328 | mutex_lock(&fs_info->volume_mutex); | |
329 | ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, | |
330 | &tgt_device); | |
331 | if (ret) { | |
332 | pr_err("btrfs: target device %s is invalid!\n", | |
333 | args->start.tgtdev_name); | |
334 | mutex_unlock(&fs_info->volume_mutex); | |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, | |
339 | args->start.srcdev_name, | |
340 | &src_device); | |
341 | mutex_unlock(&fs_info->volume_mutex); | |
342 | if (ret) { | |
343 | ret = -EINVAL; | |
344 | goto leave_no_lock; | |
345 | } | |
346 | ||
347 | if (tgt_device->total_bytes < src_device->total_bytes) { | |
348 | pr_err("btrfs: target device is smaller than source device!\n"); | |
349 | ret = -EINVAL; | |
350 | goto leave_no_lock; | |
351 | } | |
352 | ||
353 | btrfs_dev_replace_lock(dev_replace); | |
354 | switch (dev_replace->replace_state) { | |
355 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
356 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
357 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
358 | break; | |
359 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
360 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
361 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; | |
362 | goto leave; | |
363 | } | |
364 | ||
365 | dev_replace->cont_reading_from_srcdev_mode = | |
366 | args->start.cont_reading_from_srcdev_mode; | |
367 | WARN_ON(!src_device); | |
368 | dev_replace->srcdev = src_device; | |
369 | WARN_ON(!tgt_device); | |
370 | dev_replace->tgtdev = tgt_device; | |
371 | ||
372 | printk_in_rcu(KERN_INFO | |
373 | "btrfs: dev_replace from %s (devid %llu) to %s) started\n", | |
374 | src_device->missing ? "<missing disk>" : | |
375 | rcu_str_deref(src_device->name), | |
376 | src_device->devid, | |
377 | rcu_str_deref(tgt_device->name)); | |
378 | ||
379 | tgt_device->total_bytes = src_device->total_bytes; | |
380 | tgt_device->disk_total_bytes = src_device->disk_total_bytes; | |
381 | tgt_device->bytes_used = src_device->bytes_used; | |
382 | ||
383 | /* | |
384 | * from now on, the writes to the srcdev are all duplicated to | |
385 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
386 | */ | |
387 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
388 | dev_replace->time_started = btrfs_get_seconds_since_1970(); | |
389 | dev_replace->cursor_left = 0; | |
390 | dev_replace->committed_cursor_left = 0; | |
391 | dev_replace->cursor_left_last_write_of_item = 0; | |
392 | dev_replace->cursor_right = 0; | |
393 | dev_replace->is_valid = 1; | |
394 | dev_replace->item_needs_writeback = 1; | |
395 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
396 | btrfs_dev_replace_unlock(dev_replace); | |
397 | ||
398 | btrfs_wait_ordered_extents(root, 0); | |
399 | ||
400 | /* force writing the updated state information to disk */ | |
401 | trans = btrfs_start_transaction(root, 0); | |
402 | if (IS_ERR(trans)) { | |
403 | ret = PTR_ERR(trans); | |
404 | btrfs_dev_replace_lock(dev_replace); | |
405 | goto leave; | |
406 | } | |
407 | ||
408 | ret = btrfs_commit_transaction(trans, root); | |
409 | WARN_ON(ret); | |
410 | ||
411 | /* the disk copy procedure reuses the scrub code */ | |
412 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
413 | src_device->total_bytes, | |
414 | &dev_replace->scrub_progress, 0, 1); | |
415 | ||
416 | ret = btrfs_dev_replace_finishing(root->fs_info, ret); | |
417 | WARN_ON(ret); | |
418 | ||
419 | return 0; | |
420 | ||
421 | leave: | |
422 | dev_replace->srcdev = NULL; | |
423 | dev_replace->tgtdev = NULL; | |
424 | btrfs_dev_replace_unlock(dev_replace); | |
425 | leave_no_lock: | |
426 | if (tgt_device) | |
427 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
428 | return ret; | |
429 | } | |
430 | ||
431 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, | |
432 | int scrub_ret) | |
433 | { | |
434 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
435 | struct btrfs_device *tgt_device; | |
436 | struct btrfs_device *src_device; | |
437 | struct btrfs_root *root = fs_info->tree_root; | |
438 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
439 | struct btrfs_trans_handle *trans; | |
440 | int ret = 0; | |
441 | ||
442 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
443 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
444 | ||
445 | btrfs_dev_replace_lock(dev_replace); | |
446 | /* was the operation canceled, or is it finished? */ | |
447 | if (dev_replace->replace_state != | |
448 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
449 | btrfs_dev_replace_unlock(dev_replace); | |
450 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
451 | return 0; | |
452 | } | |
453 | ||
454 | tgt_device = dev_replace->tgtdev; | |
455 | src_device = dev_replace->srcdev; | |
456 | btrfs_dev_replace_unlock(dev_replace); | |
457 | ||
458 | /* replace old device with new one in mapping tree */ | |
459 | if (!scrub_ret) | |
460 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, | |
461 | src_device, | |
462 | tgt_device); | |
463 | ||
464 | /* | |
465 | * flush all outstanding I/O and inode extent mappings before the | |
466 | * copy operation is declared as being finished | |
467 | */ | |
468 | btrfs_start_delalloc_inodes(root, 0); | |
469 | btrfs_wait_ordered_extents(root, 0); | |
470 | ||
471 | trans = btrfs_start_transaction(root, 0); | |
472 | if (IS_ERR(trans)) { | |
473 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
474 | return PTR_ERR(trans); | |
475 | } | |
476 | ret = btrfs_commit_transaction(trans, root); | |
477 | WARN_ON(ret); | |
478 | ||
479 | /* keep away write_all_supers() during the finishing procedure */ | |
480 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
481 | btrfs_dev_replace_lock(dev_replace); | |
482 | dev_replace->replace_state = | |
483 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
484 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
485 | dev_replace->tgtdev = NULL; | |
486 | dev_replace->srcdev = NULL; | |
487 | dev_replace->time_stopped = btrfs_get_seconds_since_1970(); | |
488 | dev_replace->item_needs_writeback = 1; | |
489 | ||
490 | if (scrub_ret) { | |
491 | printk_in_rcu(KERN_ERR | |
492 | "btrfs: btrfs_scrub_dev(%s, %llu, %s) failed %d\n", | |
493 | src_device->missing ? "<missing disk>" : | |
494 | rcu_str_deref(src_device->name), | |
495 | src_device->devid, | |
496 | rcu_str_deref(tgt_device->name), scrub_ret); | |
497 | btrfs_dev_replace_unlock(dev_replace); | |
498 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
499 | if (tgt_device) | |
500 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
501 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | printk_in_rcu(KERN_INFO | |
507 | "btrfs: dev_replace from %s (devid %llu) to %s) finished\n", | |
508 | src_device->missing ? "<missing disk>" : | |
509 | rcu_str_deref(src_device->name), | |
510 | src_device->devid, | |
511 | rcu_str_deref(tgt_device->name)); | |
512 | tgt_device->is_tgtdev_for_dev_replace = 0; | |
513 | tgt_device->devid = src_device->devid; | |
514 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
515 | tgt_device->bytes_used = src_device->bytes_used; | |
516 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); | |
517 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
518 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
519 | tgt_device->total_bytes = src_device->total_bytes; | |
520 | tgt_device->disk_total_bytes = src_device->disk_total_bytes; | |
521 | tgt_device->bytes_used = src_device->bytes_used; | |
522 | if (fs_info->sb->s_bdev == src_device->bdev) | |
523 | fs_info->sb->s_bdev = tgt_device->bdev; | |
524 | if (fs_info->fs_devices->latest_bdev == src_device->bdev) | |
525 | fs_info->fs_devices->latest_bdev = tgt_device->bdev; | |
526 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); | |
527 | ||
528 | btrfs_rm_dev_replace_srcdev(fs_info, src_device); | |
529 | if (src_device->bdev) { | |
530 | /* zero out the old super */ | |
531 | btrfs_scratch_superblock(src_device); | |
532 | } | |
533 | /* | |
534 | * this is again a consistent state where no dev_replace procedure | |
535 | * is running, the target device is part of the filesystem, the | |
536 | * source device is not part of the filesystem anymore and its 1st | |
537 | * superblock is scratched out so that it is no longer marked to | |
538 | * belong to this filesystem. | |
539 | */ | |
540 | btrfs_dev_replace_unlock(dev_replace); | |
541 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
542 | ||
543 | /* write back the superblocks */ | |
544 | trans = btrfs_start_transaction(root, 0); | |
545 | if (!IS_ERR(trans)) | |
546 | btrfs_commit_transaction(trans, root); | |
547 | ||
548 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
554 | struct btrfs_fs_info *fs_info, | |
555 | struct btrfs_device *srcdev, | |
556 | struct btrfs_device *tgtdev) | |
557 | { | |
558 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; | |
559 | struct extent_map *em; | |
560 | struct map_lookup *map; | |
561 | u64 start = 0; | |
562 | int i; | |
563 | ||
564 | write_lock(&em_tree->lock); | |
565 | do { | |
566 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
567 | if (!em) | |
568 | break; | |
569 | map = (struct map_lookup *)em->bdev; | |
570 | for (i = 0; i < map->num_stripes; i++) | |
571 | if (srcdev == map->stripes[i].dev) | |
572 | map->stripes[i].dev = tgtdev; | |
573 | start = em->start + em->len; | |
574 | free_extent_map(em); | |
575 | } while (start); | |
576 | write_unlock(&em_tree->lock); | |
577 | } | |
578 | ||
579 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, | |
580 | char *srcdev_name, | |
581 | struct btrfs_device **device) | |
582 | { | |
583 | int ret; | |
584 | ||
585 | if (srcdevid) { | |
586 | ret = 0; | |
587 | *device = btrfs_find_device(root->fs_info, srcdevid, NULL, | |
588 | NULL); | |
589 | if (!*device) | |
590 | ret = -ENOENT; | |
591 | } else { | |
592 | ret = btrfs_find_device_missing_or_by_path(root, srcdev_name, | |
593 | device); | |
594 | } | |
595 | return ret; | |
596 | } | |
597 | ||
598 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, | |
599 | struct btrfs_ioctl_dev_replace_args *args) | |
600 | { | |
601 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
602 | ||
603 | btrfs_dev_replace_lock(dev_replace); | |
604 | /* even if !dev_replace_is_valid, the values are good enough for | |
605 | * the replace_status ioctl */ | |
606 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
607 | args->status.replace_state = dev_replace->replace_state; | |
608 | args->status.time_started = dev_replace->time_started; | |
609 | args->status.time_stopped = dev_replace->time_stopped; | |
610 | args->status.num_write_errors = | |
611 | atomic64_read(&dev_replace->num_write_errors); | |
612 | args->status.num_uncorrectable_read_errors = | |
613 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
614 | switch (dev_replace->replace_state) { | |
615 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
616 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
617 | args->status.progress_1000 = 0; | |
618 | break; | |
619 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
620 | args->status.progress_1000 = 1000; | |
621 | break; | |
622 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
623 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
624 | args->status.progress_1000 = div64_u64(dev_replace->cursor_left, | |
625 | div64_u64(dev_replace->srcdev->total_bytes, 1000)); | |
626 | break; | |
627 | } | |
628 | btrfs_dev_replace_unlock(dev_replace); | |
629 | } | |
630 | ||
631 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, | |
632 | struct btrfs_ioctl_dev_replace_args *args) | |
633 | { | |
634 | args->result = __btrfs_dev_replace_cancel(fs_info); | |
635 | return 0; | |
636 | } | |
637 | ||
638 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) | |
639 | { | |
640 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
641 | struct btrfs_device *tgt_device = NULL; | |
642 | struct btrfs_trans_handle *trans; | |
643 | struct btrfs_root *root = fs_info->tree_root; | |
644 | u64 result; | |
645 | int ret; | |
646 | ||
647 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
648 | btrfs_dev_replace_lock(dev_replace); | |
649 | switch (dev_replace->replace_state) { | |
650 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
651 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
652 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
653 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
654 | btrfs_dev_replace_unlock(dev_replace); | |
655 | goto leave; | |
656 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
657 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
658 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
659 | tgt_device = dev_replace->tgtdev; | |
660 | dev_replace->tgtdev = NULL; | |
661 | dev_replace->srcdev = NULL; | |
662 | break; | |
663 | } | |
664 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
665 | dev_replace->time_stopped = btrfs_get_seconds_since_1970(); | |
666 | dev_replace->item_needs_writeback = 1; | |
667 | btrfs_dev_replace_unlock(dev_replace); | |
668 | btrfs_scrub_cancel(fs_info); | |
669 | ||
670 | trans = btrfs_start_transaction(root, 0); | |
671 | if (IS_ERR(trans)) { | |
672 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
673 | return PTR_ERR(trans); | |
674 | } | |
675 | ret = btrfs_commit_transaction(trans, root); | |
676 | WARN_ON(ret); | |
677 | if (tgt_device) | |
678 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
679 | ||
680 | leave: | |
681 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
682 | return result; | |
683 | } | |
684 | ||
685 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
686 | { | |
687 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
688 | ||
689 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
690 | btrfs_dev_replace_lock(dev_replace); | |
691 | switch (dev_replace->replace_state) { | |
692 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
693 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
694 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
695 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
696 | break; | |
697 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
698 | dev_replace->replace_state = | |
699 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
700 | dev_replace->time_stopped = btrfs_get_seconds_since_1970(); | |
701 | dev_replace->item_needs_writeback = 1; | |
702 | pr_info("btrfs: suspending dev_replace for unmount\n"); | |
703 | break; | |
704 | } | |
705 | ||
706 | btrfs_dev_replace_unlock(dev_replace); | |
707 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
708 | } | |
709 | ||
710 | /* resume dev_replace procedure that was interrupted by unmount */ | |
711 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
712 | { | |
713 | struct task_struct *task; | |
714 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
715 | ||
716 | btrfs_dev_replace_lock(dev_replace); | |
717 | switch (dev_replace->replace_state) { | |
718 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
719 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
720 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
721 | btrfs_dev_replace_unlock(dev_replace); | |
722 | return 0; | |
723 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
724 | break; | |
725 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
726 | dev_replace->replace_state = | |
727 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
728 | break; | |
729 | } | |
730 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
731 | pr_info("btrfs: cannot continue dev_replace, tgtdev is missing\n" | |
732 | "btrfs: you may cancel the operation after 'mount -o degraded'\n"); | |
733 | btrfs_dev_replace_unlock(dev_replace); | |
734 | return 0; | |
735 | } | |
736 | btrfs_dev_replace_unlock(dev_replace); | |
737 | ||
738 | WARN_ON(atomic_xchg( | |
739 | &fs_info->mutually_exclusive_operation_running, 1)); | |
740 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); | |
741 | return PTR_RET(task); | |
742 | } | |
743 | ||
744 | static int btrfs_dev_replace_kthread(void *data) | |
745 | { | |
746 | struct btrfs_fs_info *fs_info = data; | |
747 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
748 | struct btrfs_ioctl_dev_replace_args *status_args; | |
749 | u64 progress; | |
750 | ||
751 | status_args = kzalloc(sizeof(*status_args), GFP_NOFS); | |
752 | if (status_args) { | |
753 | btrfs_dev_replace_status(fs_info, status_args); | |
754 | progress = status_args->status.progress_1000; | |
755 | kfree(status_args); | |
756 | do_div(progress, 10); | |
757 | printk_in_rcu(KERN_INFO | |
758 | "btrfs: continuing dev_replace from %s (devid %llu) to %s @%u%%\n", | |
759 | dev_replace->srcdev->missing ? "<missing disk>" : | |
760 | rcu_str_deref(dev_replace->srcdev->name), | |
761 | dev_replace->srcdev->devid, | |
762 | dev_replace->tgtdev ? | |
763 | rcu_str_deref(dev_replace->tgtdev->name) : | |
764 | "<missing target disk>", | |
765 | (unsigned int)progress); | |
766 | } | |
767 | btrfs_dev_replace_continue_on_mount(fs_info); | |
768 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
769 | ||
770 | return 0; | |
771 | } | |
772 | ||
773 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) | |
774 | { | |
775 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
776 | int ret; | |
777 | ||
778 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, | |
779 | dev_replace->committed_cursor_left, | |
780 | dev_replace->srcdev->total_bytes, | |
781 | &dev_replace->scrub_progress, 0, 1); | |
782 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
783 | WARN_ON(ret); | |
784 | return 0; | |
785 | } | |
786 | ||
787 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) | |
788 | { | |
789 | if (!dev_replace->is_valid) | |
790 | return 0; | |
791 | ||
792 | switch (dev_replace->replace_state) { | |
793 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
794 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
795 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
796 | return 0; | |
797 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
798 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
799 | /* | |
800 | * return true even if tgtdev is missing (this is | |
801 | * something that can happen if the dev_replace | |
802 | * procedure is suspended by an umount and then | |
803 | * the tgtdev is missing (or "btrfs dev scan") was | |
804 | * not called and the the filesystem is remounted | |
805 | * in degraded state. This does not stop the | |
806 | * dev_replace procedure. It needs to be canceled | |
807 | * manually if the cancelation is wanted. | |
808 | */ | |
809 | break; | |
810 | } | |
811 | return 1; | |
812 | } | |
813 | ||
814 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace) | |
815 | { | |
816 | /* the beginning is just an optimization for the typical case */ | |
817 | if (atomic_read(&dev_replace->nesting_level) == 0) { | |
818 | acquire_lock: | |
819 | /* this is not a nested case where the same thread | |
820 | * is trying to acqurire the same lock twice */ | |
821 | mutex_lock(&dev_replace->lock); | |
822 | mutex_lock(&dev_replace->lock_management_lock); | |
823 | dev_replace->lock_owner = current->pid; | |
824 | atomic_inc(&dev_replace->nesting_level); | |
825 | mutex_unlock(&dev_replace->lock_management_lock); | |
826 | return; | |
827 | } | |
828 | ||
829 | mutex_lock(&dev_replace->lock_management_lock); | |
830 | if (atomic_read(&dev_replace->nesting_level) > 0 && | |
831 | dev_replace->lock_owner == current->pid) { | |
832 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); | |
833 | atomic_inc(&dev_replace->nesting_level); | |
834 | mutex_unlock(&dev_replace->lock_management_lock); | |
835 | return; | |
836 | } | |
837 | ||
838 | mutex_unlock(&dev_replace->lock_management_lock); | |
839 | goto acquire_lock; | |
840 | } | |
841 | ||
842 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace) | |
843 | { | |
844 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); | |
845 | mutex_lock(&dev_replace->lock_management_lock); | |
846 | WARN_ON(atomic_read(&dev_replace->nesting_level) < 1); | |
847 | WARN_ON(dev_replace->lock_owner != current->pid); | |
848 | atomic_dec(&dev_replace->nesting_level); | |
849 | if (atomic_read(&dev_replace->nesting_level) == 0) { | |
850 | dev_replace->lock_owner = 0; | |
851 | mutex_unlock(&dev_replace->lock_management_lock); | |
852 | mutex_unlock(&dev_replace->lock); | |
853 | } else { | |
854 | mutex_unlock(&dev_replace->lock_management_lock); | |
855 | } | |
856 | } |