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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" | |
49c6f736 | 39 | #include "sysfs.h" |
e93c89c1 | 40 | |
e93c89c1 SB |
41 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
42 | int scrub_ret); | |
43 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
44 | struct btrfs_fs_info *fs_info, | |
45 | struct btrfs_device *srcdev, | |
46 | struct btrfs_device *tgtdev); | |
47 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, | |
48 | char *srcdev_name, | |
49 | struct btrfs_device **device); | |
50 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); | |
51 | static int btrfs_dev_replace_kthread(void *data); | |
52 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); | |
53 | ||
54 | ||
55 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) | |
56 | { | |
57 | struct btrfs_key key; | |
58 | struct btrfs_root *dev_root = fs_info->dev_root; | |
59 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
60 | struct extent_buffer *eb; | |
61 | int slot; | |
62 | int ret = 0; | |
63 | struct btrfs_path *path = NULL; | |
64 | int item_size; | |
65 | struct btrfs_dev_replace_item *ptr; | |
66 | u64 src_devid; | |
67 | ||
68 | path = btrfs_alloc_path(); | |
69 | if (!path) { | |
70 | ret = -ENOMEM; | |
71 | goto out; | |
72 | } | |
73 | ||
74 | key.objectid = 0; | |
75 | key.type = BTRFS_DEV_REPLACE_KEY; | |
76 | key.offset = 0; | |
77 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); | |
78 | if (ret) { | |
79 | no_valid_dev_replace_entry_found: | |
80 | ret = 0; | |
81 | dev_replace->replace_state = | |
82 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; | |
83 | dev_replace->cont_reading_from_srcdev_mode = | |
84 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; | |
85 | dev_replace->replace_state = 0; | |
86 | dev_replace->time_started = 0; | |
87 | dev_replace->time_stopped = 0; | |
88 | atomic64_set(&dev_replace->num_write_errors, 0); | |
89 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); | |
90 | dev_replace->cursor_left = 0; | |
91 | dev_replace->committed_cursor_left = 0; | |
92 | dev_replace->cursor_left_last_write_of_item = 0; | |
93 | dev_replace->cursor_right = 0; | |
94 | dev_replace->srcdev = NULL; | |
95 | dev_replace->tgtdev = NULL; | |
96 | dev_replace->is_valid = 0; | |
97 | dev_replace->item_needs_writeback = 0; | |
98 | goto out; | |
99 | } | |
100 | slot = path->slots[0]; | |
101 | eb = path->nodes[0]; | |
102 | item_size = btrfs_item_size_nr(eb, slot); | |
103 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); | |
104 | ||
105 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { | |
efe120a0 FH |
106 | btrfs_warn(fs_info, |
107 | "dev_replace entry found has unexpected size, ignore entry"); | |
e93c89c1 SB |
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; | |
efe120a0 FH |
150 | btrfs_warn(fs_info, |
151 | "cannot mount because device replace operation is ongoing and"); | |
152 | btrfs_warn(fs_info, | |
153 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
154 | src_devid); | |
e93c89c1 SB |
155 | } |
156 | if (!dev_replace->tgtdev && | |
157 | !btrfs_test_opt(dev_root, DEGRADED)) { | |
158 | ret = -EIO; | |
efe120a0 FH |
159 | btrfs_warn(fs_info, |
160 | "cannot mount because device replace operation is ongoing and"); | |
161 | btrfs_warn(fs_info, | |
162 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", | |
6e71c47a | 163 | BTRFS_DEV_REPLACE_DEVID); |
e93c89c1 SB |
164 | } |
165 | if (dev_replace->tgtdev) { | |
166 | if (dev_replace->srcdev) { | |
167 | dev_replace->tgtdev->total_bytes = | |
168 | dev_replace->srcdev->total_bytes; | |
169 | dev_replace->tgtdev->disk_total_bytes = | |
170 | dev_replace->srcdev->disk_total_bytes; | |
171 | dev_replace->tgtdev->bytes_used = | |
172 | dev_replace->srcdev->bytes_used; | |
173 | } | |
174 | dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1; | |
175 | btrfs_init_dev_replace_tgtdev_for_resume(fs_info, | |
176 | dev_replace->tgtdev); | |
177 | } | |
178 | break; | |
179 | } | |
180 | ||
181 | out: | |
182 | if (path) | |
183 | btrfs_free_path(path); | |
184 | return ret; | |
185 | } | |
186 | ||
187 | /* | |
188 | * called from commit_transaction. Writes changed device replace state to | |
189 | * disk. | |
190 | */ | |
191 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans, | |
192 | struct btrfs_fs_info *fs_info) | |
193 | { | |
194 | int ret; | |
195 | struct btrfs_root *dev_root = fs_info->dev_root; | |
196 | struct btrfs_path *path; | |
197 | struct btrfs_key key; | |
198 | struct extent_buffer *eb; | |
199 | struct btrfs_dev_replace_item *ptr; | |
200 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
201 | ||
202 | btrfs_dev_replace_lock(dev_replace); | |
203 | if (!dev_replace->is_valid || | |
204 | !dev_replace->item_needs_writeback) { | |
205 | btrfs_dev_replace_unlock(dev_replace); | |
206 | return 0; | |
207 | } | |
208 | btrfs_dev_replace_unlock(dev_replace); | |
209 | ||
210 | key.objectid = 0; | |
211 | key.type = BTRFS_DEV_REPLACE_KEY; | |
212 | key.offset = 0; | |
213 | ||
214 | path = btrfs_alloc_path(); | |
215 | if (!path) { | |
216 | ret = -ENOMEM; | |
217 | goto out; | |
218 | } | |
219 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); | |
220 | if (ret < 0) { | |
efe120a0 | 221 | btrfs_warn(fs_info, "error %d while searching for dev_replace item!", |
e93c89c1 SB |
222 | ret); |
223 | goto out; | |
224 | } | |
225 | ||
226 | if (ret == 0 && | |
227 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { | |
228 | /* | |
229 | * need to delete old one and insert a new one. | |
230 | * Since no attempt is made to recover any old state, if the | |
231 | * dev_replace state is 'running', the data on the target | |
232 | * drive is lost. | |
233 | * It would be possible to recover the state: just make sure | |
234 | * that the beginning of the item is never changed and always | |
235 | * contains all the essential information. Then read this | |
236 | * minimal set of information and use it as a base for the | |
237 | * new state. | |
238 | */ | |
239 | ret = btrfs_del_item(trans, dev_root, path); | |
240 | if (ret != 0) { | |
efe120a0 | 241 | btrfs_warn(fs_info, "delete too small dev_replace item failed %d!", |
e93c89c1 SB |
242 | ret); |
243 | goto out; | |
244 | } | |
245 | ret = 1; | |
246 | } | |
247 | ||
248 | if (ret == 1) { | |
249 | /* need to insert a new item */ | |
250 | btrfs_release_path(path); | |
251 | ret = btrfs_insert_empty_item(trans, dev_root, path, | |
252 | &key, sizeof(*ptr)); | |
253 | if (ret < 0) { | |
efe120a0 | 254 | btrfs_warn(fs_info, "insert dev_replace item failed %d!", |
e93c89c1 SB |
255 | ret); |
256 | goto out; | |
257 | } | |
258 | } | |
259 | ||
260 | eb = path->nodes[0]; | |
261 | ptr = btrfs_item_ptr(eb, path->slots[0], | |
262 | struct btrfs_dev_replace_item); | |
263 | ||
264 | btrfs_dev_replace_lock(dev_replace); | |
265 | if (dev_replace->srcdev) | |
266 | btrfs_set_dev_replace_src_devid(eb, ptr, | |
267 | dev_replace->srcdev->devid); | |
268 | else | |
269 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); | |
270 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, | |
271 | dev_replace->cont_reading_from_srcdev_mode); | |
272 | btrfs_set_dev_replace_replace_state(eb, ptr, | |
273 | dev_replace->replace_state); | |
274 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); | |
275 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); | |
276 | btrfs_set_dev_replace_num_write_errors(eb, ptr, | |
277 | atomic64_read(&dev_replace->num_write_errors)); | |
278 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, | |
279 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); | |
280 | dev_replace->cursor_left_last_write_of_item = | |
281 | dev_replace->cursor_left; | |
282 | btrfs_set_dev_replace_cursor_left(eb, ptr, | |
283 | dev_replace->cursor_left_last_write_of_item); | |
284 | btrfs_set_dev_replace_cursor_right(eb, ptr, | |
285 | dev_replace->cursor_right); | |
286 | dev_replace->item_needs_writeback = 0; | |
287 | btrfs_dev_replace_unlock(dev_replace); | |
288 | ||
289 | btrfs_mark_buffer_dirty(eb); | |
290 | ||
291 | out: | |
292 | btrfs_free_path(path); | |
293 | ||
294 | return ret; | |
295 | } | |
296 | ||
297 | void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) | |
298 | { | |
299 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
300 | ||
301 | dev_replace->committed_cursor_left = | |
302 | dev_replace->cursor_left_last_write_of_item; | |
303 | } | |
304 | ||
e93c89c1 SB |
305 | int btrfs_dev_replace_start(struct btrfs_root *root, |
306 | struct btrfs_ioctl_dev_replace_args *args) | |
307 | { | |
308 | struct btrfs_trans_handle *trans; | |
309 | struct btrfs_fs_info *fs_info = root->fs_info; | |
310 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
311 | int ret; | |
312 | struct btrfs_device *tgt_device = NULL; | |
313 | struct btrfs_device *src_device = NULL; | |
314 | ||
49688107 | 315 | if (btrfs_fs_incompat(fs_info, RAID56)) { |
efe120a0 | 316 | btrfs_warn(fs_info, "dev_replace cannot yet handle RAID5/RAID6"); |
c81d5767 | 317 | return -EOPNOTSUPP; |
49688107 SB |
318 | } |
319 | ||
e93c89c1 SB |
320 | switch (args->start.cont_reading_from_srcdev_mode) { |
321 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: | |
322 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: | |
323 | break; | |
324 | default: | |
325 | return -EINVAL; | |
326 | } | |
327 | ||
328 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || | |
329 | args->start.tgtdev_name[0] == '\0') | |
330 | return -EINVAL; | |
331 | ||
332 | mutex_lock(&fs_info->volume_mutex); | |
333 | ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, | |
334 | &tgt_device); | |
335 | if (ret) { | |
efe120a0 | 336 | btrfs_err(fs_info, "target device %s is invalid!", |
e93c89c1 SB |
337 | args->start.tgtdev_name); |
338 | mutex_unlock(&fs_info->volume_mutex); | |
339 | return -EINVAL; | |
340 | } | |
341 | ||
342 | ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, | |
343 | args->start.srcdev_name, | |
344 | &src_device); | |
345 | mutex_unlock(&fs_info->volume_mutex); | |
346 | if (ret) { | |
347 | ret = -EINVAL; | |
348 | goto leave_no_lock; | |
349 | } | |
350 | ||
351 | if (tgt_device->total_bytes < src_device->total_bytes) { | |
efe120a0 | 352 | btrfs_err(fs_info, "target device is smaller than source device!"); |
e93c89c1 SB |
353 | ret = -EINVAL; |
354 | goto leave_no_lock; | |
355 | } | |
356 | ||
357 | btrfs_dev_replace_lock(dev_replace); | |
358 | switch (dev_replace->replace_state) { | |
359 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
360 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
361 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
362 | break; | |
363 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
364 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
365 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; | |
366 | goto leave; | |
367 | } | |
368 | ||
369 | dev_replace->cont_reading_from_srcdev_mode = | |
370 | args->start.cont_reading_from_srcdev_mode; | |
371 | WARN_ON(!src_device); | |
372 | dev_replace->srcdev = src_device; | |
373 | WARN_ON(!tgt_device); | |
374 | dev_replace->tgtdev = tgt_device; | |
375 | ||
376 | printk_in_rcu(KERN_INFO | |
efe120a0 | 377 | "BTRFS: dev_replace from %s (devid %llu) to %s started\n", |
e93c89c1 SB |
378 | src_device->missing ? "<missing disk>" : |
379 | rcu_str_deref(src_device->name), | |
380 | src_device->devid, | |
381 | rcu_str_deref(tgt_device->name)); | |
382 | ||
383 | tgt_device->total_bytes = src_device->total_bytes; | |
384 | tgt_device->disk_total_bytes = src_device->disk_total_bytes; | |
385 | tgt_device->bytes_used = src_device->bytes_used; | |
386 | ||
387 | /* | |
388 | * from now on, the writes to the srcdev are all duplicated to | |
389 | * go to the tgtdev as well (refer to btrfs_map_block()). | |
390 | */ | |
391 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
4546bcae | 392 | dev_replace->time_started = get_seconds(); |
e93c89c1 SB |
393 | dev_replace->cursor_left = 0; |
394 | dev_replace->committed_cursor_left = 0; | |
395 | dev_replace->cursor_left_last_write_of_item = 0; | |
396 | dev_replace->cursor_right = 0; | |
397 | dev_replace->is_valid = 1; | |
398 | dev_replace->item_needs_writeback = 1; | |
399 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
400 | btrfs_dev_replace_unlock(dev_replace); | |
401 | ||
b0244199 | 402 | btrfs_wait_ordered_roots(root->fs_info, -1); |
e93c89c1 SB |
403 | |
404 | /* force writing the updated state information to disk */ | |
405 | trans = btrfs_start_transaction(root, 0); | |
406 | if (IS_ERR(trans)) { | |
407 | ret = PTR_ERR(trans); | |
408 | btrfs_dev_replace_lock(dev_replace); | |
409 | goto leave; | |
410 | } | |
411 | ||
412 | ret = btrfs_commit_transaction(trans, root); | |
413 | WARN_ON(ret); | |
414 | ||
415 | /* the disk copy procedure reuses the scrub code */ | |
416 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, | |
417 | src_device->total_bytes, | |
418 | &dev_replace->scrub_progress, 0, 1); | |
419 | ||
420 | ret = btrfs_dev_replace_finishing(root->fs_info, ret); | |
421 | WARN_ON(ret); | |
422 | ||
423 | return 0; | |
424 | ||
425 | leave: | |
426 | dev_replace->srcdev = NULL; | |
427 | dev_replace->tgtdev = NULL; | |
428 | btrfs_dev_replace_unlock(dev_replace); | |
429 | leave_no_lock: | |
430 | if (tgt_device) | |
431 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
432 | return ret; | |
433 | } | |
434 | ||
c404e0dc MX |
435 | /* |
436 | * blocked until all flighting bios are finished. | |
437 | */ | |
438 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) | |
439 | { | |
440 | s64 writers; | |
441 | DEFINE_WAIT(wait); | |
442 | ||
443 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
444 | do { | |
445 | prepare_to_wait(&fs_info->replace_wait, &wait, | |
446 | TASK_UNINTERRUPTIBLE); | |
447 | writers = percpu_counter_sum(&fs_info->bio_counter); | |
448 | if (writers) | |
449 | schedule(); | |
450 | finish_wait(&fs_info->replace_wait, &wait); | |
451 | } while (writers); | |
452 | } | |
453 | ||
454 | /* | |
455 | * we have removed target device, it is safe to allow new bios request. | |
456 | */ | |
457 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) | |
458 | { | |
459 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); | |
460 | if (waitqueue_active(&fs_info->replace_wait)) | |
461 | wake_up(&fs_info->replace_wait); | |
462 | } | |
463 | ||
e93c89c1 SB |
464 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
465 | int scrub_ret) | |
466 | { | |
467 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
468 | struct btrfs_device *tgt_device; | |
469 | struct btrfs_device *src_device; | |
470 | struct btrfs_root *root = fs_info->tree_root; | |
471 | u8 uuid_tmp[BTRFS_UUID_SIZE]; | |
472 | struct btrfs_trans_handle *trans; | |
473 | int ret = 0; | |
474 | ||
475 | /* don't allow cancel or unmount to disturb the finishing procedure */ | |
476 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
477 | ||
478 | btrfs_dev_replace_lock(dev_replace); | |
479 | /* was the operation canceled, or is it finished? */ | |
480 | if (dev_replace->replace_state != | |
481 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { | |
482 | btrfs_dev_replace_unlock(dev_replace); | |
483 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
484 | return 0; | |
485 | } | |
486 | ||
487 | tgt_device = dev_replace->tgtdev; | |
488 | src_device = dev_replace->srcdev; | |
489 | btrfs_dev_replace_unlock(dev_replace); | |
490 | ||
e93c89c1 SB |
491 | /* |
492 | * flush all outstanding I/O and inode extent mappings before the | |
493 | * copy operation is declared as being finished | |
494 | */ | |
6c255e67 | 495 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
3edb2a68 MX |
496 | if (ret) { |
497 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
498 | return ret; | |
499 | } | |
b0244199 | 500 | btrfs_wait_ordered_roots(root->fs_info, -1); |
e93c89c1 SB |
501 | |
502 | trans = btrfs_start_transaction(root, 0); | |
503 | if (IS_ERR(trans)) { | |
504 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
505 | return PTR_ERR(trans); | |
506 | } | |
507 | ret = btrfs_commit_transaction(trans, root); | |
508 | WARN_ON(ret); | |
509 | ||
510 | /* keep away write_all_supers() during the finishing procedure */ | |
391cd9df | 511 | mutex_lock(&root->fs_info->chunk_mutex); |
e93c89c1 SB |
512 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
513 | btrfs_dev_replace_lock(dev_replace); | |
514 | dev_replace->replace_state = | |
515 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED | |
516 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; | |
517 | dev_replace->tgtdev = NULL; | |
518 | dev_replace->srcdev = NULL; | |
4546bcae | 519 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
520 | dev_replace->item_needs_writeback = 1; |
521 | ||
c404e0dc MX |
522 | /* replace old device with new one in mapping tree */ |
523 | if (!scrub_ret) { | |
524 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, | |
525 | src_device, | |
526 | tgt_device); | |
527 | } else { | |
e93c89c1 | 528 | printk_in_rcu(KERN_ERR |
efe120a0 | 529 | "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n", |
e93c89c1 SB |
530 | src_device->missing ? "<missing disk>" : |
531 | rcu_str_deref(src_device->name), | |
532 | src_device->devid, | |
533 | rcu_str_deref(tgt_device->name), scrub_ret); | |
534 | btrfs_dev_replace_unlock(dev_replace); | |
535 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
391cd9df | 536 | mutex_unlock(&root->fs_info->chunk_mutex); |
e93c89c1 SB |
537 | if (tgt_device) |
538 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
539 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | printk_in_rcu(KERN_INFO | |
de4c296f | 545 | "BTRFS: dev_replace from %s (devid %llu) to %s finished\n", |
e93c89c1 SB |
546 | src_device->missing ? "<missing disk>" : |
547 | rcu_str_deref(src_device->name), | |
548 | src_device->devid, | |
549 | rcu_str_deref(tgt_device->name)); | |
550 | tgt_device->is_tgtdev_for_dev_replace = 0; | |
551 | tgt_device->devid = src_device->devid; | |
552 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; | |
553 | tgt_device->bytes_used = src_device->bytes_used; | |
554 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); | |
555 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); | |
556 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); | |
557 | tgt_device->total_bytes = src_device->total_bytes; | |
558 | tgt_device->disk_total_bytes = src_device->disk_total_bytes; | |
559 | tgt_device->bytes_used = src_device->bytes_used; | |
560 | if (fs_info->sb->s_bdev == src_device->bdev) | |
561 | fs_info->sb->s_bdev = tgt_device->bdev; | |
562 | if (fs_info->fs_devices->latest_bdev == src_device->bdev) | |
563 | fs_info->fs_devices->latest_bdev = tgt_device->bdev; | |
564 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); | |
63dd86fa AJ |
565 | if (src_device->fs_devices->seeding) |
566 | fs_info->fs_devices->rw_devices++; | |
e93c89c1 | 567 | |
49c6f736 AJ |
568 | /* replace the sysfs entry */ |
569 | btrfs_kobj_rm_device(fs_info, src_device); | |
570 | btrfs_kobj_add_device(fs_info, tgt_device); | |
571 | ||
c404e0dc MX |
572 | btrfs_rm_dev_replace_blocked(fs_info); |
573 | ||
e93c89c1 | 574 | btrfs_rm_dev_replace_srcdev(fs_info, src_device); |
1357272f | 575 | |
c404e0dc MX |
576 | btrfs_rm_dev_replace_unblocked(fs_info); |
577 | ||
e93c89c1 SB |
578 | /* |
579 | * this is again a consistent state where no dev_replace procedure | |
580 | * is running, the target device is part of the filesystem, the | |
581 | * source device is not part of the filesystem anymore and its 1st | |
582 | * superblock is scratched out so that it is no longer marked to | |
583 | * belong to this filesystem. | |
584 | */ | |
585 | btrfs_dev_replace_unlock(dev_replace); | |
586 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
391cd9df | 587 | mutex_unlock(&root->fs_info->chunk_mutex); |
e93c89c1 SB |
588 | |
589 | /* write back the superblocks */ | |
590 | trans = btrfs_start_transaction(root, 0); | |
591 | if (!IS_ERR(trans)) | |
592 | btrfs_commit_transaction(trans, root); | |
593 | ||
594 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
599 | static void btrfs_dev_replace_update_device_in_mapping_tree( | |
600 | struct btrfs_fs_info *fs_info, | |
601 | struct btrfs_device *srcdev, | |
602 | struct btrfs_device *tgtdev) | |
603 | { | |
604 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; | |
605 | struct extent_map *em; | |
606 | struct map_lookup *map; | |
607 | u64 start = 0; | |
608 | int i; | |
609 | ||
610 | write_lock(&em_tree->lock); | |
611 | do { | |
612 | em = lookup_extent_mapping(em_tree, start, (u64)-1); | |
613 | if (!em) | |
614 | break; | |
615 | map = (struct map_lookup *)em->bdev; | |
616 | for (i = 0; i < map->num_stripes; i++) | |
617 | if (srcdev == map->stripes[i].dev) | |
618 | map->stripes[i].dev = tgtdev; | |
619 | start = em->start + em->len; | |
620 | free_extent_map(em); | |
621 | } while (start); | |
622 | write_unlock(&em_tree->lock); | |
623 | } | |
624 | ||
625 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, | |
626 | char *srcdev_name, | |
627 | struct btrfs_device **device) | |
628 | { | |
629 | int ret; | |
630 | ||
631 | if (srcdevid) { | |
632 | ret = 0; | |
633 | *device = btrfs_find_device(root->fs_info, srcdevid, NULL, | |
634 | NULL); | |
635 | if (!*device) | |
636 | ret = -ENOENT; | |
637 | } else { | |
638 | ret = btrfs_find_device_missing_or_by_path(root, srcdev_name, | |
639 | device); | |
640 | } | |
641 | return ret; | |
642 | } | |
643 | ||
644 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, | |
645 | struct btrfs_ioctl_dev_replace_args *args) | |
646 | { | |
647 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
648 | ||
649 | btrfs_dev_replace_lock(dev_replace); | |
650 | /* even if !dev_replace_is_valid, the values are good enough for | |
651 | * the replace_status ioctl */ | |
652 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
653 | args->status.replace_state = dev_replace->replace_state; | |
654 | args->status.time_started = dev_replace->time_started; | |
655 | args->status.time_stopped = dev_replace->time_stopped; | |
656 | args->status.num_write_errors = | |
657 | atomic64_read(&dev_replace->num_write_errors); | |
658 | args->status.num_uncorrectable_read_errors = | |
659 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); | |
660 | switch (dev_replace->replace_state) { | |
661 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
662 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
663 | args->status.progress_1000 = 0; | |
664 | break; | |
665 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
666 | args->status.progress_1000 = 1000; | |
667 | break; | |
668 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
669 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
670 | args->status.progress_1000 = div64_u64(dev_replace->cursor_left, | |
671 | div64_u64(dev_replace->srcdev->total_bytes, 1000)); | |
672 | break; | |
673 | } | |
674 | btrfs_dev_replace_unlock(dev_replace); | |
675 | } | |
676 | ||
677 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, | |
678 | struct btrfs_ioctl_dev_replace_args *args) | |
679 | { | |
680 | args->result = __btrfs_dev_replace_cancel(fs_info); | |
681 | return 0; | |
682 | } | |
683 | ||
684 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) | |
685 | { | |
686 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
687 | struct btrfs_device *tgt_device = NULL; | |
688 | struct btrfs_trans_handle *trans; | |
689 | struct btrfs_root *root = fs_info->tree_root; | |
690 | u64 result; | |
691 | int ret; | |
692 | ||
e649e587 ID |
693 | if (fs_info->sb->s_flags & MS_RDONLY) |
694 | return -EROFS; | |
695 | ||
e93c89c1 SB |
696 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
697 | btrfs_dev_replace_lock(dev_replace); | |
698 | switch (dev_replace->replace_state) { | |
699 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
700 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
701 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
702 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; | |
703 | btrfs_dev_replace_unlock(dev_replace); | |
704 | goto leave; | |
705 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
706 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
707 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; | |
708 | tgt_device = dev_replace->tgtdev; | |
709 | dev_replace->tgtdev = NULL; | |
710 | dev_replace->srcdev = NULL; | |
711 | break; | |
712 | } | |
713 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; | |
4546bcae | 714 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 SB |
715 | dev_replace->item_needs_writeback = 1; |
716 | btrfs_dev_replace_unlock(dev_replace); | |
717 | btrfs_scrub_cancel(fs_info); | |
718 | ||
719 | trans = btrfs_start_transaction(root, 0); | |
720 | if (IS_ERR(trans)) { | |
721 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
722 | return PTR_ERR(trans); | |
723 | } | |
724 | ret = btrfs_commit_transaction(trans, root); | |
725 | WARN_ON(ret); | |
726 | if (tgt_device) | |
727 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); | |
728 | ||
729 | leave: | |
730 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
731 | return result; | |
732 | } | |
733 | ||
734 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) | |
735 | { | |
736 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
737 | ||
738 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); | |
739 | btrfs_dev_replace_lock(dev_replace); | |
740 | switch (dev_replace->replace_state) { | |
741 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
742 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
743 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
744 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
745 | break; | |
746 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
747 | dev_replace->replace_state = | |
748 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; | |
4546bcae | 749 | dev_replace->time_stopped = get_seconds(); |
e93c89c1 | 750 | dev_replace->item_needs_writeback = 1; |
efe120a0 | 751 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
e93c89c1 SB |
752 | break; |
753 | } | |
754 | ||
755 | btrfs_dev_replace_unlock(dev_replace); | |
756 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); | |
757 | } | |
758 | ||
759 | /* resume dev_replace procedure that was interrupted by unmount */ | |
760 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) | |
761 | { | |
762 | struct task_struct *task; | |
763 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
764 | ||
765 | btrfs_dev_replace_lock(dev_replace); | |
766 | switch (dev_replace->replace_state) { | |
767 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
768 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
769 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
770 | btrfs_dev_replace_unlock(dev_replace); | |
771 | return 0; | |
772 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
773 | break; | |
774 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
775 | dev_replace->replace_state = | |
776 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; | |
777 | break; | |
778 | } | |
779 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { | |
efe120a0 FH |
780 | btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing"); |
781 | btrfs_info(fs_info, | |
782 | "you may cancel the operation after 'mount -o degraded'"); | |
e93c89c1 SB |
783 | btrfs_dev_replace_unlock(dev_replace); |
784 | return 0; | |
785 | } | |
786 | btrfs_dev_replace_unlock(dev_replace); | |
787 | ||
788 | WARN_ON(atomic_xchg( | |
789 | &fs_info->mutually_exclusive_operation_running, 1)); | |
790 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); | |
8c6ffba0 | 791 | return PTR_ERR_OR_ZERO(task); |
e93c89c1 SB |
792 | } |
793 | ||
794 | static int btrfs_dev_replace_kthread(void *data) | |
795 | { | |
796 | struct btrfs_fs_info *fs_info = data; | |
797 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
798 | struct btrfs_ioctl_dev_replace_args *status_args; | |
799 | u64 progress; | |
800 | ||
801 | status_args = kzalloc(sizeof(*status_args), GFP_NOFS); | |
802 | if (status_args) { | |
803 | btrfs_dev_replace_status(fs_info, status_args); | |
804 | progress = status_args->status.progress_1000; | |
805 | kfree(status_args); | |
806 | do_div(progress, 10); | |
807 | printk_in_rcu(KERN_INFO | |
efe120a0 FH |
808 | "BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n", |
809 | dev_replace->srcdev->missing ? "<missing disk>" : | |
810 | rcu_str_deref(dev_replace->srcdev->name), | |
811 | dev_replace->srcdev->devid, | |
812 | dev_replace->tgtdev ? | |
813 | rcu_str_deref(dev_replace->tgtdev->name) : | |
814 | "<missing target disk>", | |
815 | (unsigned int)progress); | |
e93c89c1 SB |
816 | } |
817 | btrfs_dev_replace_continue_on_mount(fs_info); | |
818 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
823 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) | |
824 | { | |
825 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; | |
826 | int ret; | |
827 | ||
828 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, | |
829 | dev_replace->committed_cursor_left, | |
830 | dev_replace->srcdev->total_bytes, | |
831 | &dev_replace->scrub_progress, 0, 1); | |
832 | ret = btrfs_dev_replace_finishing(fs_info, ret); | |
833 | WARN_ON(ret); | |
834 | return 0; | |
835 | } | |
836 | ||
837 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) | |
838 | { | |
839 | if (!dev_replace->is_valid) | |
840 | return 0; | |
841 | ||
842 | switch (dev_replace->replace_state) { | |
843 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: | |
844 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: | |
845 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: | |
846 | return 0; | |
847 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: | |
848 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: | |
849 | /* | |
850 | * return true even if tgtdev is missing (this is | |
851 | * something that can happen if the dev_replace | |
852 | * procedure is suspended by an umount and then | |
853 | * the tgtdev is missing (or "btrfs dev scan") was | |
854 | * not called and the the filesystem is remounted | |
855 | * in degraded state. This does not stop the | |
856 | * dev_replace procedure. It needs to be canceled | |
857 | * manually if the cancelation is wanted. | |
858 | */ | |
859 | break; | |
860 | } | |
861 | return 1; | |
862 | } | |
863 | ||
864 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace) | |
865 | { | |
866 | /* the beginning is just an optimization for the typical case */ | |
867 | if (atomic_read(&dev_replace->nesting_level) == 0) { | |
868 | acquire_lock: | |
869 | /* this is not a nested case where the same thread | |
870 | * is trying to acqurire the same lock twice */ | |
871 | mutex_lock(&dev_replace->lock); | |
872 | mutex_lock(&dev_replace->lock_management_lock); | |
873 | dev_replace->lock_owner = current->pid; | |
874 | atomic_inc(&dev_replace->nesting_level); | |
875 | mutex_unlock(&dev_replace->lock_management_lock); | |
876 | return; | |
877 | } | |
878 | ||
879 | mutex_lock(&dev_replace->lock_management_lock); | |
880 | if (atomic_read(&dev_replace->nesting_level) > 0 && | |
881 | dev_replace->lock_owner == current->pid) { | |
882 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); | |
883 | atomic_inc(&dev_replace->nesting_level); | |
884 | mutex_unlock(&dev_replace->lock_management_lock); | |
885 | return; | |
886 | } | |
887 | ||
888 | mutex_unlock(&dev_replace->lock_management_lock); | |
889 | goto acquire_lock; | |
890 | } | |
891 | ||
892 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace) | |
893 | { | |
894 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); | |
895 | mutex_lock(&dev_replace->lock_management_lock); | |
896 | WARN_ON(atomic_read(&dev_replace->nesting_level) < 1); | |
897 | WARN_ON(dev_replace->lock_owner != current->pid); | |
898 | atomic_dec(&dev_replace->nesting_level); | |
899 | if (atomic_read(&dev_replace->nesting_level) == 0) { | |
900 | dev_replace->lock_owner = 0; | |
901 | mutex_unlock(&dev_replace->lock_management_lock); | |
902 | mutex_unlock(&dev_replace->lock); | |
903 | } else { | |
904 | mutex_unlock(&dev_replace->lock_management_lock); | |
905 | } | |
906 | } | |
c404e0dc MX |
907 | |
908 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) | |
909 | { | |
910 | percpu_counter_inc(&fs_info->bio_counter); | |
911 | } | |
912 | ||
913 | void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info) | |
914 | { | |
915 | percpu_counter_dec(&fs_info->bio_counter); | |
916 | ||
917 | if (waitqueue_active(&fs_info->replace_wait)) | |
918 | wake_up(&fs_info->replace_wait); | |
919 | } | |
920 | ||
921 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) | |
922 | { | |
923 | DEFINE_WAIT(wait); | |
924 | again: | |
925 | percpu_counter_inc(&fs_info->bio_counter); | |
926 | if (test_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state)) { | |
927 | btrfs_bio_counter_dec(fs_info); | |
928 | wait_event(fs_info->replace_wait, | |
929 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, | |
930 | &fs_info->fs_state)); | |
931 | goto again; | |
932 | } | |
933 | ||
934 | } |