blob: eea26e1b2fda1d21230dd5f1e01e25f8fb23a3e8 [file] [log] [blame]
Stefan Behrense93c89c2012-11-05 17:33:06 +01001/*
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>
Stefan Behrense93c89c2012-11-05 17:33:06 +010029#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"
Anand Jain49c6f732014-06-03 11:36:02 +080039#include "sysfs.h"
Stefan Behrense93c89c2012-11-05 17:33:06 +010040
Stefan Behrense93c89c2012-11-05 17:33:06 +010041static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
42 int scrub_ret);
43static 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);
47static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
48 char *srcdev_name,
49 struct btrfs_device **device);
50static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info);
51static int btrfs_dev_replace_kthread(void *data);
52static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info);
53
54
55int 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) {
79no_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)) {
Frank Holtonefe120a2013-12-20 11:37:06 -0500106 btrfs_warn(fs_info,
107 "dev_replace entry found has unexpected size, ignore entry");
Stefan Behrense93c89c2012-11-05 17:33:06 +0100108 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;
Frank Holtonefe120a2013-12-20 11:37:06 -0500150 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);
Stefan Behrense93c89c2012-11-05 17:33:06 +0100155 }
156 if (!dev_replace->tgtdev &&
157 !btrfs_test_opt(dev_root, DEGRADED)) {
158 ret = -EIO;
Frank Holtonefe120a2013-12-20 11:37:06 -0500159 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'?",
Geert Uytterhoeven6e71c472013-08-20 13:20:08 +0200163 BTRFS_DEV_REPLACE_DEVID);
Stefan Behrense93c89c2012-11-05 17:33:06 +0100164 }
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
181out:
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 */
191int 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) {
Frank Holtonefe120a2013-12-20 11:37:06 -0500221 btrfs_warn(fs_info, "error %d while searching for dev_replace item!",
Stefan Behrense93c89c2012-11-05 17:33:06 +0100222 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) {
Frank Holtonefe120a2013-12-20 11:37:06 -0500241 btrfs_warn(fs_info, "delete too small dev_replace item failed %d!",
Stefan Behrense93c89c2012-11-05 17:33:06 +0100242 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) {
Frank Holtonefe120a2013-12-20 11:37:06 -0500254 btrfs_warn(fs_info, "insert dev_replace item failed %d!",
Stefan Behrense93c89c2012-11-05 17:33:06 +0100255 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
291out:
292 btrfs_free_path(path);
293
294 return ret;
295}
296
297void 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
Stefan Behrense93c89c2012-11-05 17:33:06 +0100305int 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
Stefan Behrens49688102013-05-07 17:28:03 +0000315 if (btrfs_fs_incompat(fs_info, RAID56)) {
Frank Holtonefe120a2013-12-20 11:37:06 -0500316 btrfs_warn(fs_info, "dev_replace cannot yet handle RAID5/RAID6");
Gui Hechengc81d5762014-06-05 10:02:51 +0800317 return -EOPNOTSUPP;
Stefan Behrens49688102013-05-07 17:28:03 +0000318 }
319
Stefan Behrense93c89c2012-11-05 17:33:06 +0100320 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) {
Frank Holtonefe120a2013-12-20 11:37:06 -0500336 btrfs_err(fs_info, "target device %s is invalid!",
Stefan Behrense93c89c2012-11-05 17:33:06 +0100337 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) {
Frank Holtonefe120a2013-12-20 11:37:06 -0500352 btrfs_err(fs_info, "target device is smaller than source device!");
Stefan Behrense93c89c2012-11-05 17:33:06 +0100353 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
Frank Holtonefe120a2013-12-20 11:37:06 -0500377 "BTRFS: dev_replace from %s (devid %llu) to %s started\n",
Stefan Behrense93c89c2012-11-05 17:33:06 +0100378 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;
Zach Brown4546bca2013-10-16 12:10:32 -0700392 dev_replace->time_started = get_seconds();
Stefan Behrense93c89c2012-11-05 17:33:06 +0100393 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
Miao Xieb0244192013-11-04 23:13:25 +0800402 btrfs_wait_ordered_roots(root->fs_info, -1);
Stefan Behrense93c89c2012-11-05 17:33:06 +0100403
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
425leave:
426 dev_replace->srcdev = NULL;
427 dev_replace->tgtdev = NULL;
428 btrfs_dev_replace_unlock(dev_replace);
429leave_no_lock:
430 if (tgt_device)
431 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
432 return ret;
433}
434
Miao Xiec404e0d2014-01-30 16:46:55 +0800435/*
436 * blocked until all flighting bios are finished.
437 */
438static 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 */
457static 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
Stefan Behrense93c89c2012-11-05 17:33:06 +0100464static 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
Stefan Behrense93c89c2012-11-05 17:33:06 +0100491 /*
492 * flush all outstanding I/O and inode extent mappings before the
493 * copy operation is declared as being finished
494 */
Miao Xie6c255e62014-03-06 13:55:01 +0800495 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
Miao Xie3edb2a62013-01-22 10:49:33 +0000496 if (ret) {
497 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
498 return ret;
499 }
Miao Xieb0244192013-11-04 23:13:25 +0800500 btrfs_wait_ordered_roots(root->fs_info, -1);
Stefan Behrense93c89c2012-11-05 17:33:06 +0100501
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 */
Miao Xie391cd9d2014-01-30 16:46:54 +0800511 mutex_lock(&root->fs_info->chunk_mutex);
Stefan Behrense93c89c2012-11-05 17:33:06 +0100512 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;
Zach Brown4546bca2013-10-16 12:10:32 -0700519 dev_replace->time_stopped = get_seconds();
Stefan Behrense93c89c2012-11-05 17:33:06 +0100520 dev_replace->item_needs_writeback = 1;
521
Miao Xiec404e0d2014-01-30 16:46:55 +0800522 /* 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 {
Stefan Behrense93c89c2012-11-05 17:33:06 +0100528 printk_in_rcu(KERN_ERR
Frank Holtonefe120a2013-12-20 11:37:06 -0500529 "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
Stefan Behrense93c89c2012-11-05 17:33:06 +0100530 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);
Miao Xie391cd9d2014-01-30 16:46:54 +0800536 mutex_unlock(&root->fs_info->chunk_mutex);
Stefan Behrense93c89c2012-11-05 17:33:06 +0100537 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
Frank Holtonefe120a2013-12-20 11:37:06 -0500545 "BTRFS: dev_replace from %s (devid %llu) to %s) finished\n",
Stefan Behrense93c89c2012-11-05 17:33:06 +0100546 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);
565
Anand Jain49c6f732014-06-03 11:36:02 +0800566 /* replace the sysfs entry */
567 btrfs_kobj_rm_device(fs_info, src_device);
568 btrfs_kobj_add_device(fs_info, tgt_device);
569
Miao Xiec404e0d2014-01-30 16:46:55 +0800570 btrfs_rm_dev_replace_blocked(fs_info);
571
Stefan Behrense93c89c2012-11-05 17:33:06 +0100572 btrfs_rm_dev_replace_srcdev(fs_info, src_device);
Ilya Dryomov13572722013-10-02 20:41:01 +0300573
Miao Xiec404e0d2014-01-30 16:46:55 +0800574 btrfs_rm_dev_replace_unblocked(fs_info);
575
Stefan Behrense93c89c2012-11-05 17:33:06 +0100576 /*
577 * this is again a consistent state where no dev_replace procedure
578 * is running, the target device is part of the filesystem, the
579 * source device is not part of the filesystem anymore and its 1st
580 * superblock is scratched out so that it is no longer marked to
581 * belong to this filesystem.
582 */
583 btrfs_dev_replace_unlock(dev_replace);
584 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
Miao Xie391cd9d2014-01-30 16:46:54 +0800585 mutex_unlock(&root->fs_info->chunk_mutex);
Stefan Behrense93c89c2012-11-05 17:33:06 +0100586
587 /* write back the superblocks */
588 trans = btrfs_start_transaction(root, 0);
589 if (!IS_ERR(trans))
590 btrfs_commit_transaction(trans, root);
591
592 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
593
594 return 0;
595}
596
597static void btrfs_dev_replace_update_device_in_mapping_tree(
598 struct btrfs_fs_info *fs_info,
599 struct btrfs_device *srcdev,
600 struct btrfs_device *tgtdev)
601{
602 struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
603 struct extent_map *em;
604 struct map_lookup *map;
605 u64 start = 0;
606 int i;
607
608 write_lock(&em_tree->lock);
609 do {
610 em = lookup_extent_mapping(em_tree, start, (u64)-1);
611 if (!em)
612 break;
613 map = (struct map_lookup *)em->bdev;
614 for (i = 0; i < map->num_stripes; i++)
615 if (srcdev == map->stripes[i].dev)
616 map->stripes[i].dev = tgtdev;
617 start = em->start + em->len;
618 free_extent_map(em);
619 } while (start);
620 write_unlock(&em_tree->lock);
621}
622
623static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
624 char *srcdev_name,
625 struct btrfs_device **device)
626{
627 int ret;
628
629 if (srcdevid) {
630 ret = 0;
631 *device = btrfs_find_device(root->fs_info, srcdevid, NULL,
632 NULL);
633 if (!*device)
634 ret = -ENOENT;
635 } else {
636 ret = btrfs_find_device_missing_or_by_path(root, srcdev_name,
637 device);
638 }
639 return ret;
640}
641
642void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
643 struct btrfs_ioctl_dev_replace_args *args)
644{
645 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
646
647 btrfs_dev_replace_lock(dev_replace);
648 /* even if !dev_replace_is_valid, the values are good enough for
649 * the replace_status ioctl */
650 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
651 args->status.replace_state = dev_replace->replace_state;
652 args->status.time_started = dev_replace->time_started;
653 args->status.time_stopped = dev_replace->time_stopped;
654 args->status.num_write_errors =
655 atomic64_read(&dev_replace->num_write_errors);
656 args->status.num_uncorrectable_read_errors =
657 atomic64_read(&dev_replace->num_uncorrectable_read_errors);
658 switch (dev_replace->replace_state) {
659 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
660 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
661 args->status.progress_1000 = 0;
662 break;
663 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
664 args->status.progress_1000 = 1000;
665 break;
666 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
667 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
668 args->status.progress_1000 = div64_u64(dev_replace->cursor_left,
669 div64_u64(dev_replace->srcdev->total_bytes, 1000));
670 break;
671 }
672 btrfs_dev_replace_unlock(dev_replace);
673}
674
675int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info,
676 struct btrfs_ioctl_dev_replace_args *args)
677{
678 args->result = __btrfs_dev_replace_cancel(fs_info);
679 return 0;
680}
681
682static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info)
683{
684 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
685 struct btrfs_device *tgt_device = NULL;
686 struct btrfs_trans_handle *trans;
687 struct btrfs_root *root = fs_info->tree_root;
688 u64 result;
689 int ret;
690
Ilya Dryomove649e582013-10-10 20:40:21 +0300691 if (fs_info->sb->s_flags & MS_RDONLY)
692 return -EROFS;
693
Stefan Behrense93c89c2012-11-05 17:33:06 +0100694 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
695 btrfs_dev_replace_lock(dev_replace);
696 switch (dev_replace->replace_state) {
697 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
698 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
699 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
700 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED;
701 btrfs_dev_replace_unlock(dev_replace);
702 goto leave;
703 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
704 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
705 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
706 tgt_device = dev_replace->tgtdev;
707 dev_replace->tgtdev = NULL;
708 dev_replace->srcdev = NULL;
709 break;
710 }
711 dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED;
Zach Brown4546bca2013-10-16 12:10:32 -0700712 dev_replace->time_stopped = get_seconds();
Stefan Behrense93c89c2012-11-05 17:33:06 +0100713 dev_replace->item_needs_writeback = 1;
714 btrfs_dev_replace_unlock(dev_replace);
715 btrfs_scrub_cancel(fs_info);
716
717 trans = btrfs_start_transaction(root, 0);
718 if (IS_ERR(trans)) {
719 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
720 return PTR_ERR(trans);
721 }
722 ret = btrfs_commit_transaction(trans, root);
723 WARN_ON(ret);
724 if (tgt_device)
725 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
726
727leave:
728 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
729 return result;
730}
731
732void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info)
733{
734 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
735
736 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
737 btrfs_dev_replace_lock(dev_replace);
738 switch (dev_replace->replace_state) {
739 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
740 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
741 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
742 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
743 break;
744 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
745 dev_replace->replace_state =
746 BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
Zach Brown4546bca2013-10-16 12:10:32 -0700747 dev_replace->time_stopped = get_seconds();
Stefan Behrense93c89c2012-11-05 17:33:06 +0100748 dev_replace->item_needs_writeback = 1;
Frank Holtonefe120a2013-12-20 11:37:06 -0500749 btrfs_info(fs_info, "suspending dev_replace for unmount");
Stefan Behrense93c89c2012-11-05 17:33:06 +0100750 break;
751 }
752
753 btrfs_dev_replace_unlock(dev_replace);
754 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
755}
756
757/* resume dev_replace procedure that was interrupted by unmount */
758int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
759{
760 struct task_struct *task;
761 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
762
763 btrfs_dev_replace_lock(dev_replace);
764 switch (dev_replace->replace_state) {
765 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
766 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
767 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
768 btrfs_dev_replace_unlock(dev_replace);
769 return 0;
770 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
771 break;
772 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
773 dev_replace->replace_state =
774 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
775 break;
776 }
777 if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) {
Frank Holtonefe120a2013-12-20 11:37:06 -0500778 btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing");
779 btrfs_info(fs_info,
780 "you may cancel the operation after 'mount -o degraded'");
Stefan Behrense93c89c2012-11-05 17:33:06 +0100781 btrfs_dev_replace_unlock(dev_replace);
782 return 0;
783 }
784 btrfs_dev_replace_unlock(dev_replace);
785
786 WARN_ON(atomic_xchg(
787 &fs_info->mutually_exclusive_operation_running, 1));
788 task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl");
Rusty Russell8c6ffba2013-07-15 11:20:32 +0930789 return PTR_ERR_OR_ZERO(task);
Stefan Behrense93c89c2012-11-05 17:33:06 +0100790}
791
792static int btrfs_dev_replace_kthread(void *data)
793{
794 struct btrfs_fs_info *fs_info = data;
795 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
796 struct btrfs_ioctl_dev_replace_args *status_args;
797 u64 progress;
798
799 status_args = kzalloc(sizeof(*status_args), GFP_NOFS);
800 if (status_args) {
801 btrfs_dev_replace_status(fs_info, status_args);
802 progress = status_args->status.progress_1000;
803 kfree(status_args);
804 do_div(progress, 10);
805 printk_in_rcu(KERN_INFO
Frank Holtonefe120a2013-12-20 11:37:06 -0500806 "BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n",
807 dev_replace->srcdev->missing ? "<missing disk>" :
808 rcu_str_deref(dev_replace->srcdev->name),
809 dev_replace->srcdev->devid,
810 dev_replace->tgtdev ?
811 rcu_str_deref(dev_replace->tgtdev->name) :
812 "<missing target disk>",
813 (unsigned int)progress);
Stefan Behrense93c89c2012-11-05 17:33:06 +0100814 }
815 btrfs_dev_replace_continue_on_mount(fs_info);
816 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
817
818 return 0;
819}
820
821static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info)
822{
823 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
824 int ret;
825
826 ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid,
827 dev_replace->committed_cursor_left,
828 dev_replace->srcdev->total_bytes,
829 &dev_replace->scrub_progress, 0, 1);
830 ret = btrfs_dev_replace_finishing(fs_info, ret);
831 WARN_ON(ret);
832 return 0;
833}
834
835int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
836{
837 if (!dev_replace->is_valid)
838 return 0;
839
840 switch (dev_replace->replace_state) {
841 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
842 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
843 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
844 return 0;
845 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
846 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
847 /*
848 * return true even if tgtdev is missing (this is
849 * something that can happen if the dev_replace
850 * procedure is suspended by an umount and then
851 * the tgtdev is missing (or "btrfs dev scan") was
852 * not called and the the filesystem is remounted
853 * in degraded state. This does not stop the
854 * dev_replace procedure. It needs to be canceled
855 * manually if the cancelation is wanted.
856 */
857 break;
858 }
859 return 1;
860}
861
862void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace)
863{
864 /* the beginning is just an optimization for the typical case */
865 if (atomic_read(&dev_replace->nesting_level) == 0) {
866acquire_lock:
867 /* this is not a nested case where the same thread
868 * is trying to acqurire the same lock twice */
869 mutex_lock(&dev_replace->lock);
870 mutex_lock(&dev_replace->lock_management_lock);
871 dev_replace->lock_owner = current->pid;
872 atomic_inc(&dev_replace->nesting_level);
873 mutex_unlock(&dev_replace->lock_management_lock);
874 return;
875 }
876
877 mutex_lock(&dev_replace->lock_management_lock);
878 if (atomic_read(&dev_replace->nesting_level) > 0 &&
879 dev_replace->lock_owner == current->pid) {
880 WARN_ON(!mutex_is_locked(&dev_replace->lock));
881 atomic_inc(&dev_replace->nesting_level);
882 mutex_unlock(&dev_replace->lock_management_lock);
883 return;
884 }
885
886 mutex_unlock(&dev_replace->lock_management_lock);
887 goto acquire_lock;
888}
889
890void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace)
891{
892 WARN_ON(!mutex_is_locked(&dev_replace->lock));
893 mutex_lock(&dev_replace->lock_management_lock);
894 WARN_ON(atomic_read(&dev_replace->nesting_level) < 1);
895 WARN_ON(dev_replace->lock_owner != current->pid);
896 atomic_dec(&dev_replace->nesting_level);
897 if (atomic_read(&dev_replace->nesting_level) == 0) {
898 dev_replace->lock_owner = 0;
899 mutex_unlock(&dev_replace->lock_management_lock);
900 mutex_unlock(&dev_replace->lock);
901 } else {
902 mutex_unlock(&dev_replace->lock_management_lock);
903 }
904}
Miao Xiec404e0d2014-01-30 16:46:55 +0800905
906void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info)
907{
908 percpu_counter_inc(&fs_info->bio_counter);
909}
910
911void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
912{
913 percpu_counter_dec(&fs_info->bio_counter);
914
915 if (waitqueue_active(&fs_info->replace_wait))
916 wake_up(&fs_info->replace_wait);
917}
918
919void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info)
920{
921 DEFINE_WAIT(wait);
922again:
923 percpu_counter_inc(&fs_info->bio_counter);
924 if (test_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state)) {
925 btrfs_bio_counter_dec(fs_info);
926 wait_event(fs_info->replace_wait,
927 !test_bit(BTRFS_FS_STATE_DEV_REPLACING,
928 &fs_info->fs_state));
929 goto again;
930 }
931
932}