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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> | |
e93c89c1 SB |
29 | #include "ctree.h" |
30 | #include "extent_map.h" | |
31 | #include "disk-io.h" | |
32 | #include "transaction.h" | |
33 | #include "print-tree.h" | |
34 | #include "volumes.h" | |
35 | #include "async-thread.h" | |
36 | #include "check-integrity.h" | |
37 | #include "rcu-string.h" | |
38 | #include "dev-replace.h" | |
39 | ||
e93c89c1 SB |
40 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
41 | int scrub_ret); | |
42 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
43 | struct btrfs_fs_info *fs_info, | |
44 | struct btrfs_device *srcdev, | |
45 | struct btrfs_device *tgtdev); | |
46 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, | |
47 | char *srcdev_name, | |
48 | struct btrfs_device **device); | |
49 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); | |
50 | static int btrfs_dev_replace_kthread(void *data); | |
51 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); | |
52 | ||
53 | ||
54 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
55 | { | |
56 | struct btrfs_key key; | |
57 | struct btrfs_root *dev_root = fs_info->dev_root; | |
58 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
59 | struct extent_buffer *eb; | |
60 | int slot; | |
61 | int ret = 0; | |
62 | struct btrfs_path *path = NULL; | |
63 | int item_size; | |
64 | struct btrfs_dev_replace_item *ptr; | |
65 | u64 src_devid; | |
66 | ||
67 | path = btrfs_alloc_path(); | |
68 | if (!path) { | |
69 | ret = -ENOMEM; | |
70 | goto out; | |
71 | } | |
72 | ||
73 | key.objectid = 0; | |
74 | key.type = BTRFS_DEV_REPLACE_KEY; | |
75 | key.offset = 0; | |
76 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
77 | if (ret) { | |
78 | no_valid_dev_replace_entry_found: | |
79 | ret = 0; | |
80 | dev_replace->replace_state = | |
81 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; | |
82 | dev_replace->cont_reading_from_srcdev_mode = | |
83 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
84 | dev_replace->replace_state = 0; | |
85 | dev_replace->time_started = 0; | |
86 | dev_replace->time_stopped = 0; | |
87 | atomic64_set(&dev_replace->num_write_errors, 0); | |
88 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
89 | dev_replace->cursor_left = 0; | |
90 | dev_replace->committed_cursor_left = 0; | |
91 | dev_replace->cursor_left_last_write_of_item = 0; | |
92 | dev_replace->cursor_right = 0; | |
93 | dev_replace->srcdev = NULL; | |
94 | dev_replace->tgtdev = NULL; | |
95 | dev_replace->is_valid = 0; | |
96 | dev_replace->item_needs_writeback = 0; | |
97 | goto out; | |
98 | } | |
99 | slot = path->slots[0]; | |
100 | eb = path->nodes[0]; | |
101 | item_size = btrfs_item_size_nr(eb, slot); | |
102 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); | |
103 | ||
104 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
105 | pr_warn("btrfs: dev_replace entry found has unexpected size, ignore entry\n"); | |
106 | goto no_valid_dev_replace_entry_found; | |
107 | } | |
108 | ||
109 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); | |
110 | dev_replace->cont_reading_from_srcdev_mode = | |
111 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); | |
112 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); | |
113 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); | |
114 | dev_replace->time_stopped = | |
115 | btrfs_dev_replace_time_stopped(eb, ptr); | |
116 | atomic64_set(&dev_replace->num_write_errors, | |
117 | btrfs_dev_replace_num_write_errors(eb, ptr)); | |
118 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, | |
119 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); | |
120 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); | |
121 | dev_replace->committed_cursor_left = dev_replace->cursor_left; | |
122 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; | |
123 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); | |
124 | dev_replace->is_valid = 1; | |
125 | ||
126 | dev_replace->item_needs_writeback = 0; | |
127 | switch (dev_replace->replace_state) { | |
128 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
129 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
130 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
131 | dev_replace->srcdev = NULL; | |
132 | dev_replace->tgtdev = NULL; | |
133 | break; | |
134 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
135 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
136 | dev_replace->srcdev = btrfs_find_device(fs_info, src_devid, | |
137 | NULL, NULL); | |
138 | dev_replace->tgtdev = btrfs_find_device(fs_info, | |
139 | BTRFS_DEV_REPLACE_DEVID, | |
140 | NULL, NULL); | |
141 | /* | |
142 | * allow 'btrfs dev replace_cancel' if src/tgt device is | |
143 | * missing | |
144 | */ | |
145 | if (!dev_replace->srcdev && | |
146 | !btrfs_test_opt(dev_root, DEGRADED)) { | |
147 | ret = -EIO; | |
148 | 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", | |
c1c9ff7c | 149 | src_devid); |
e93c89c1 SB |
150 | } |
151 | if (!dev_replace->tgtdev && | |
152 | !btrfs_test_opt(dev_root, DEGRADED)) { | |
153 | ret = -EIO; | |
154 | 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", | |
6e71c47a | 155 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
156 | } |
157 | if (dev_replace->tgtdev) { | |
158 | if (dev_replace->srcdev) { | |
159 | dev_replace->tgtdev->total_bytes = | |
160 | dev_replace->srcdev->total_bytes; | |
161 | dev_replace->tgtdev->disk_total_bytes = | |
162 | dev_replace->srcdev->disk_total_bytes; | |
163 | dev_replace->tgtdev->bytes_used = | |
164 | dev_replace->srcdev->bytes_used; | |
165 | } | |
166 | dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1; | |
167 | btrfs_init_dev_replace_tgtdev_for_resume(fs_info, | |
168 | dev_replace->tgtdev); | |
169 | } | |
170 | break; | |
171 | } | |
172 | ||
173 | out: | |
174 | if (path) | |
175 | btrfs_free_path(path); | |
176 | return ret; | |
177 | } | |
178 | ||
179 | /* | |
180 | * called from commit_transaction. Writes changed device replace state to | |
181 | * disk. | |
182 | */ | |
183 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans, | |
184 | struct btrfs_fs_info *fs_info) | |
185 | { | |
186 | int ret; | |
187 | struct btrfs_root *dev_root = fs_info->dev_root; | |
188 | struct btrfs_path *path; | |
189 | struct btrfs_key key; | |
190 | struct extent_buffer *eb; | |
191 | struct btrfs_dev_replace_item *ptr; | |
192 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
193 | ||
194 | btrfs_dev_replace_lock(dev_replace); | |
195 | if (!dev_replace->is_valid || | |
196 | !dev_replace->item_needs_writeback) { | |
197 | btrfs_dev_replace_unlock(dev_replace); | |
198 | return 0; | |
199 | } | |
200 | btrfs_dev_replace_unlock(dev_replace); | |
201 | ||
202 | key.objectid = 0; | |
203 | key.type = BTRFS_DEV_REPLACE_KEY; | |
204 | key.offset = 0; | |
205 | ||
206 | path = btrfs_alloc_path(); | |
207 | if (!path) { | |
208 | ret = -ENOMEM; | |
209 | goto out; | |
210 | } | |
211 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
212 | if (ret < 0) { | |
213 | pr_warn("btrfs: error %d while searching for dev_replace item!\n", | |
214 | ret); | |
215 | goto out; | |
216 | } | |
217 | ||
218 | if (ret == 0 && | |
219 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
220 | /* | |
221 | * need to delete old one and insert a new one. | |
222 | * Since no attempt is made to recover any old state, if the | |
223 | * dev_replace state is 'running', the data on the target | |
224 | * drive is lost. | |
225 | * It would be possible to recover the state: just make sure | |
226 | * that the beginning of the item is never changed and always | |
227 | * contains all the essential information. Then read this | |
228 | * minimal set of information and use it as a base for the | |
229 | * new state. | |
230 | */ | |
231 | ret = btrfs_del_item(trans, dev_root, path); | |
232 | if (ret != 0) { | |
233 | pr_warn("btrfs: delete too small dev_replace item failed %d!\n", | |
234 | ret); | |
235 | goto out; | |
236 | } | |
237 | ret = 1; | |
238 | } | |
239 | ||
240 | if (ret == 1) { | |
241 | /* need to insert a new item */ | |
242 | btrfs_release_path(path); | |
243 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
244 | &key, sizeof(*ptr)); | |
245 | if (ret < 0) { | |
246 | pr_warn("btrfs: insert dev_replace item failed %d!\n", | |
247 | ret); | |
248 | goto out; | |
249 | } | |
250 | } | |
251 | ||
252 | eb = path->nodes[0]; | |
253 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
254 | struct btrfs_dev_replace_item); | |
255 | ||
256 | btrfs_dev_replace_lock(dev_replace); | |
257 | if (dev_replace->srcdev) | |
258 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
259 | dev_replace->srcdev->devid); | |
260 | else | |
261 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
262 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
263 | dev_replace->cont_reading_from_srcdev_mode); | |
264 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
265 | dev_replace->replace_state); | |
266 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
267 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
268 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
269 | atomic64_read(&dev_replace->num_write_errors)); | |
270 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
271 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
272 | dev_replace->cursor_left_last_write_of_item = | |
273 | dev_replace->cursor_left; | |
274 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
275 | dev_replace->cursor_left_last_write_of_item); | |
276 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
277 | dev_replace->cursor_right); | |
278 | dev_replace->item_needs_writeback = 0; | |
279 | btrfs_dev_replace_unlock(dev_replace); | |
280 | ||
281 | btrfs_mark_buffer_dirty(eb); | |
282 | ||
283 | out: | |
284 | btrfs_free_path(path); | |
285 | ||
286 | return ret; | |
287 | } | |
288 | ||
289 | void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) | |
290 | { | |
291 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
292 | ||
293 | dev_replace->committed_cursor_left = | |
294 | dev_replace->cursor_left_last_write_of_item; | |
295 | } | |
296 | ||
e93c89c1 SB |
297 | int btrfs_dev_replace_start(struct btrfs_root *root, |
298 | struct btrfs_ioctl_dev_replace_args *args) | |
299 | { | |
300 | struct btrfs_trans_handle *trans; | |
301 | struct btrfs_fs_info *fs_info = root->fs_info; | |
302 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
303 | int ret; | |
304 | struct btrfs_device *tgt_device = NULL; | |
305 | struct btrfs_device *src_device = NULL; | |
306 | ||
49688107 SB |
307 | if (btrfs_fs_incompat(fs_info, RAID56)) { |
308 | pr_warn("btrfs: dev_replace cannot yet handle RAID5/RAID6\n"); | |
309 | return -EINVAL; | |
310 | } | |
311 | ||
e93c89c1 SB |
312 | switch (args->start.cont_reading_from_srcdev_mode) { |
313 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
314 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
315 | break; | |
316 | default: | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
320 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
321 | args->start.tgtdev_name[0] == '\0') | |
322 | return -EINVAL; | |
323 | ||
324 | mutex_lock(&fs_info->volume_mutex); | |
325 | ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, | |
326 | &tgt_device); | |
327 | if (ret) { | |
328 | pr_err("btrfs: target device %s is invalid!\n", | |
329 | args->start.tgtdev_name); | |
330 | mutex_unlock(&fs_info->volume_mutex); | |
331 | return -EINVAL; | |
332 | } | |
333 | ||
334 | ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, | |
335 | args->start.srcdev_name, | |
336 | &src_device); | |
337 | mutex_unlock(&fs_info->volume_mutex); | |
338 | if (ret) { | |
339 | ret = -EINVAL; | |
340 | goto leave_no_lock; | |
341 | } | |
342 | ||
343 | if (tgt_device->total_bytes < src_device->total_bytes) { | |
344 | pr_err("btrfs: target device is smaller than source device!\n"); | |
345 | ret = -EINVAL; | |
346 | goto leave_no_lock; | |
347 | } | |
348 | ||
349 | btrfs_dev_replace_lock(dev_replace); | |
350 | switch (dev_replace->replace_state) { | |
351 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
352 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
353 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
354 | break; | |
355 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
356 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
357 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; | |
358 | goto leave; | |
359 | } | |
360 | ||
361 | dev_replace->cont_reading_from_srcdev_mode = | |
362 | args->start.cont_reading_from_srcdev_mode; | |
363 | WARN_ON(!src_device); | |
364 | dev_replace->srcdev = src_device; | |
365 | WARN_ON(!tgt_device); | |
366 | dev_replace->tgtdev = tgt_device; | |
367 | ||
368 | printk_in_rcu(KERN_INFO | |
369 | "btrfs: dev_replace from %s (devid %llu) to %s) started\n", | |
370 | src_device->missing ? "<missing disk>" : | |
371 | rcu_str_deref(src_device->name), | |
372 | src_device->devid, | |
373 | rcu_str_deref(tgt_device->name)); | |
374 | ||
375 | tgt_device->total_bytes = src_device->total_bytes; | |
376 | tgt_device->disk_total_bytes = src_device->disk_total_bytes; | |
377 | tgt_device->bytes_used = src_device->bytes_used; | |
378 | ||
379 | /* | |
380 | * from now on, the writes to the srcdev are all duplicated to | |
381 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
382 | */ | |
383 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
4546bcae | 384 | dev_replace->time_started = get_seconds(); |
e93c89c1 SB |
385 | dev_replace->cursor_left = 0; |
386 | dev_replace->committed_cursor_left = 0; | |
387 | dev_replace->cursor_left_last_write_of_item = 0; | |
388 | dev_replace->cursor_right = 0; | |
389 | dev_replace->is_valid = 1; | |
390 | dev_replace->item_needs_writeback = 1; | |
391 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
392 | btrfs_dev_replace_unlock(dev_replace); | |
393 | ||
b0244199 | 394 | btrfs_wait_ordered_roots(root->fs_info, -1); |
e93c89c1 SB |
395 | |
396 | /* force writing the updated state information to disk */ | |
397 | trans = btrfs_start_transaction(root, 0); | |
398 | if (IS_ERR(trans)) { | |
399 | ret = PTR_ERR(trans); | |
400 | btrfs_dev_replace_lock(dev_replace); | |
401 | goto leave; | |
402 | } | |
403 | ||
404 | ret = btrfs_commit_transaction(trans, root); | |
405 | WARN_ON(ret); | |
406 | ||
407 | /* the disk copy procedure reuses the scrub code */ | |
408 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
409 | src_device->total_bytes, | |
410 | &dev_replace->scrub_progress, 0, 1); | |
411 | ||
412 | ret = btrfs_dev_replace_finishing(root->fs_info, ret); | |
413 | WARN_ON(ret); | |
414 | ||
415 | return 0; | |
416 | ||
417 | leave: | |
418 | dev_replace->srcdev = NULL; | |
419 | dev_replace->tgtdev = NULL; | |
420 | btrfs_dev_replace_unlock(dev_replace); | |
421 | leave_no_lock: | |
422 | if (tgt_device) | |
423 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
424 | return ret; | |
425 | } | |
426 | ||
427 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, | |
428 | int scrub_ret) | |
429 | { | |
430 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
431 | struct btrfs_device *tgt_device; | |
432 | struct btrfs_device *src_device; | |
433 | struct btrfs_root *root = fs_info->tree_root; | |
434 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
435 | struct btrfs_trans_handle *trans; | |
436 | int ret = 0; | |
437 | ||
438 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
439 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
440 | ||
441 | btrfs_dev_replace_lock(dev_replace); | |
442 | /* was the operation canceled, or is it finished? */ | |
443 | if (dev_replace->replace_state != | |
444 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
445 | btrfs_dev_replace_unlock(dev_replace); | |
446 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
447 | return 0; | |
448 | } | |
449 | ||
450 | tgt_device = dev_replace->tgtdev; | |
451 | src_device = dev_replace->srcdev; | |
452 | btrfs_dev_replace_unlock(dev_replace); | |
453 | ||
454 | /* replace old device with new one in mapping tree */ | |
455 | if (!scrub_ret) | |
456 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, | |
457 | src_device, | |
458 | tgt_device); | |
459 | ||
460 | /* | |
461 | * flush all outstanding I/O and inode extent mappings before the | |
462 | * copy operation is declared as being finished | |
463 | */ | |
91aef86f | 464 | ret = btrfs_start_delalloc_roots(root->fs_info, 0); |
3edb2a68 MX |
465 | if (ret) { |
466 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
467 | return ret; | |
468 | } | |
b0244199 | 469 | btrfs_wait_ordered_roots(root->fs_info, -1); |
e93c89c1 SB |
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; | |
4546bcae | 487 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
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); | |
1357272f | 529 | |
e93c89c1 SB |
530 | /* |
531 | * this is again a consistent state where no dev_replace procedure | |
532 | * is running, the target device is part of the filesystem, the | |
533 | * source device is not part of the filesystem anymore and its 1st | |
534 | * superblock is scratched out so that it is no longer marked to | |
535 | * belong to this filesystem. | |
536 | */ | |
537 | btrfs_dev_replace_unlock(dev_replace); | |
538 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
539 | ||
540 | /* write back the superblocks */ | |
541 | trans = btrfs_start_transaction(root, 0); | |
542 | if (!IS_ERR(trans)) | |
543 | btrfs_commit_transaction(trans, root); | |
544 | ||
545 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
551 | struct btrfs_fs_info *fs_info, | |
552 | struct btrfs_device *srcdev, | |
553 | struct btrfs_device *tgtdev) | |
554 | { | |
555 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; | |
556 | struct extent_map *em; | |
557 | struct map_lookup *map; | |
558 | u64 start = 0; | |
559 | int i; | |
560 | ||
561 | write_lock(&em_tree->lock); | |
562 | do { | |
563 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
564 | if (!em) | |
565 | break; | |
566 | map = (struct map_lookup *)em->bdev; | |
567 | for (i = 0; i < map->num_stripes; i++) | |
568 | if (srcdev == map->stripes[i].dev) | |
569 | map->stripes[i].dev = tgtdev; | |
570 | start = em->start + em->len; | |
571 | free_extent_map(em); | |
572 | } while (start); | |
573 | write_unlock(&em_tree->lock); | |
574 | } | |
575 | ||
576 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, | |
577 | char *srcdev_name, | |
578 | struct btrfs_device **device) | |
579 | { | |
580 | int ret; | |
581 | ||
582 | if (srcdevid) { | |
583 | ret = 0; | |
584 | *device = btrfs_find_device(root->fs_info, srcdevid, NULL, | |
585 | NULL); | |
586 | if (!*device) | |
587 | ret = -ENOENT; | |
588 | } else { | |
589 | ret = btrfs_find_device_missing_or_by_path(root, srcdev_name, | |
590 | device); | |
591 | } | |
592 | return ret; | |
593 | } | |
594 | ||
595 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, | |
596 | struct btrfs_ioctl_dev_replace_args *args) | |
597 | { | |
598 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
599 | ||
600 | btrfs_dev_replace_lock(dev_replace); | |
601 | /* even if !dev_replace_is_valid, the values are good enough for | |
602 | * the replace_status ioctl */ | |
603 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
604 | args->status.replace_state = dev_replace->replace_state; | |
605 | args->status.time_started = dev_replace->time_started; | |
606 | args->status.time_stopped = dev_replace->time_stopped; | |
607 | args->status.num_write_errors = | |
608 | atomic64_read(&dev_replace->num_write_errors); | |
609 | args->status.num_uncorrectable_read_errors = | |
610 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
611 | switch (dev_replace->replace_state) { | |
612 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
613 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
614 | args->status.progress_1000 = 0; | |
615 | break; | |
616 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
617 | args->status.progress_1000 = 1000; | |
618 | break; | |
619 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
620 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
621 | args->status.progress_1000 = div64_u64(dev_replace->cursor_left, | |
622 | div64_u64(dev_replace->srcdev->total_bytes, 1000)); | |
623 | break; | |
624 | } | |
625 | btrfs_dev_replace_unlock(dev_replace); | |
626 | } | |
627 | ||
628 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, | |
629 | struct btrfs_ioctl_dev_replace_args *args) | |
630 | { | |
631 | args->result = __btrfs_dev_replace_cancel(fs_info); | |
632 | return 0; | |
633 | } | |
634 | ||
635 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) | |
636 | { | |
637 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
638 | struct btrfs_device *tgt_device = NULL; | |
639 | struct btrfs_trans_handle *trans; | |
640 | struct btrfs_root *root = fs_info->tree_root; | |
641 | u64 result; | |
642 | int ret; | |
643 | ||
e649e587 ID |
644 | if (fs_info->sb->s_flags & MS_RDONLY) |
645 | return -EROFS; | |
646 | ||
e93c89c1 SB |
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; | |
4546bcae | 665 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
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; | |
4546bcae | 700 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
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"); | |
8c6ffba0 | 741 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
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 | } |