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authorStefan Behrens <sbehrens@giantdisaster.de>2012-11-05 11:33:06 -0500
committerJosef Bacik <jbacik@fusionio.com>2012-12-12 17:15:41 -0500
commite93c89c1aaaaaec3487c4c18dd02360371790722 (patch)
tree359c310c736d0db5cfd724c628fdb9f2f680a3d3
parentff023aac31198e88507d626825379b28ea481d4d (diff)
Btrfs: add new sources for device replace code
This adds a new file to the sources together with the header file and the changes to ioctl.h and ctree.h that are required by the new C source file. Additionally, 4 new functions are added to volume.c that deal with device creation and destruction. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat
-rw-r--r--fs/btrfs/Makefile2
-rw-r--r--fs/btrfs/ctree.h2
-rw-r--r--fs/btrfs/dev-replace.c856
-rw-r--r--fs/btrfs/dev-replace.h18
-rw-r--r--fs/btrfs/ioctl.h45
-rw-r--r--fs/btrfs/volumes.c139
-rw-r--r--fs/btrfs/volumes.h8
7 files changed, 1069 insertions, 1 deletions
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index d7fcdba141a..7df3e0f0ee5 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -8,7 +8,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
8 extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \ 8 extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \
9 export.o tree-log.o free-space-cache.o zlib.o lzo.o \ 9 export.o tree-log.o free-space-cache.o zlib.o lzo.o \
10 compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \ 10 compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \
11 reada.o backref.o ulist.o qgroup.o send.o 11 reada.o backref.o ulist.o qgroup.o send.o dev-replace.o
12 12
13btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o 13btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
14btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o 14btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ded7caa0d30..45e7f752b64 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -142,6 +142,8 @@ struct btrfs_ordered_sum;
142 142
143#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2 143#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
144 144
145#define BTRFS_DEV_REPLACE_DEVID 0
146
145/* 147/*
146 * the max metadata block size. This limit is somewhat artificial, 148 * the max metadata block size. This limit is somewhat artificial,
147 * but the memmove costs go through the roof for larger blocks. 149 * but the memmove costs go through the roof for larger blocks.
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
new file mode 100644
index 00000000000..66dbc8dbddf
--- /dev/null
+++ b/fs/btrfs/dev-replace.c
@@ -0,0 +1,856 @@
1/*
2 * Copyright (C) STRATO AG 2012. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18#include <linux/sched.h>
19#include <linux/bio.h>
20#include <linux/slab.h>
21#include <linux/buffer_head.h>
22#include <linux/blkdev.h>
23#include <linux/random.h>
24#include <linux/iocontext.h>
25#include <linux/capability.h>
26#include <linux/kthread.h>
27#include <linux/math64.h>
28#include <asm/div64.h>
29#include "compat.h"
30#include "ctree.h"
31#include "extent_map.h"
32#include "disk-io.h"
33#include "transaction.h"
34#include "print-tree.h"
35#include "volumes.h"
36#include "async-thread.h"
37#include "check-integrity.h"
38#include "rcu-string.h"
39#include "dev-replace.h"
40
41static u64 btrfs_get_seconds_since_1970(void);
42static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
43 int scrub_ret);
44static void btrfs_dev_replace_update_device_in_mapping_tree(
45 struct btrfs_fs_info *fs_info,
46 struct btrfs_device *srcdev,
47 struct btrfs_device *tgtdev);
48static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
49 char *srcdev_name,
50 struct btrfs_device **device);
51static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info);
52static int btrfs_dev_replace_kthread(void *data);
53static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info);
54
55
56int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info)
57{
58 struct btrfs_key key;
59 struct btrfs_root *dev_root = fs_info->dev_root;
60 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
61 struct extent_buffer *eb;
62 int slot;
63 int ret = 0;
64 struct btrfs_path *path = NULL;
65 int item_size;
66 struct btrfs_dev_replace_item *ptr;
67 u64 src_devid;
68
69 path = btrfs_alloc_path();
70 if (!path) {
71 ret = -ENOMEM;
72 goto out;
73 }
74
75 key.objectid = 0;
76 key.type = BTRFS_DEV_REPLACE_KEY;
77 key.offset = 0;
78 ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0);
79 if (ret) {
80no_valid_dev_replace_entry_found:
81 ret = 0;
82 dev_replace->replace_state =
83 BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED;
84 dev_replace->cont_reading_from_srcdev_mode =
85 BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS;
86 dev_replace->replace_state = 0;
87 dev_replace->time_started = 0;
88 dev_replace->time_stopped = 0;
89 atomic64_set(&dev_replace->num_write_errors, 0);
90 atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0);
91 dev_replace->cursor_left = 0;
92 dev_replace->committed_cursor_left = 0;
93 dev_replace->cursor_left_last_write_of_item = 0;
94 dev_replace->cursor_right = 0;
95 dev_replace->srcdev = NULL;
96 dev_replace->tgtdev = NULL;
97 dev_replace->is_valid = 0;
98 dev_replace->item_needs_writeback = 0;
99 goto out;
100 }
101 slot = path->slots[0];
102 eb = path->nodes[0];
103 item_size = btrfs_item_size_nr(eb, slot);
104 ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item);
105
106 if (item_size != sizeof(struct btrfs_dev_replace_item)) {
107 pr_warn("btrfs: dev_replace entry found has unexpected size, ignore entry\n");
108 goto no_valid_dev_replace_entry_found;
109 }
110
111 src_devid = btrfs_dev_replace_src_devid(eb, ptr);
112 dev_replace->cont_reading_from_srcdev_mode =
113 btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr);
114 dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr);
115 dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr);
116 dev_replace->time_stopped =
117 btrfs_dev_replace_time_stopped(eb, ptr);
118 atomic64_set(&dev_replace->num_write_errors,
119 btrfs_dev_replace_num_write_errors(eb, ptr));
120 atomic64_set(&dev_replace->num_uncorrectable_read_errors,
121 btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr));
122 dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr);
123 dev_replace->committed_cursor_left = dev_replace->cursor_left;
124 dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left;
125 dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr);
126 dev_replace->is_valid = 1;
127
128 dev_replace->item_needs_writeback = 0;
129 switch (dev_replace->replace_state) {
130 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
131 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
132 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
133 dev_replace->srcdev = NULL;
134 dev_replace->tgtdev = NULL;
135 break;
136 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
137 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
138 dev_replace->srcdev = btrfs_find_device(fs_info, src_devid,
139 NULL, NULL);
140 dev_replace->tgtdev = btrfs_find_device(fs_info,
141 BTRFS_DEV_REPLACE_DEVID,
142 NULL, NULL);
143 /*
144 * allow 'btrfs dev replace_cancel' if src/tgt device is
145 * missing
146 */
147 if (!dev_replace->srcdev &&
148 !btrfs_test_opt(dev_root, DEGRADED)) {
149 ret = -EIO;
150 pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?\n",
151 (unsigned long long)src_devid);
152 }
153 if (!dev_replace->tgtdev &&
154 !btrfs_test_opt(dev_root, DEGRADED)) {
155 ret = -EIO;
156 pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "tgtdev (devid %llu) is missing, need to run btrfs dev scan?\n",
157 (unsigned long long)BTRFS_DEV_REPLACE_DEVID);
158 }
159 if (dev_replace->tgtdev) {
160 if (dev_replace->srcdev) {
161 dev_replace->tgtdev->total_bytes =
162 dev_replace->srcdev->total_bytes;
163 dev_replace->tgtdev->disk_total_bytes =
164 dev_replace->srcdev->disk_total_bytes;
165 dev_replace->tgtdev->bytes_used =
166 dev_replace->srcdev->bytes_used;
167 }
168 dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1;
169 btrfs_init_dev_replace_tgtdev_for_resume(fs_info,
170 dev_replace->tgtdev);
171 }
172 break;
173 }
174
175out:
176 if (path)
177 btrfs_free_path(path);
178 return ret;
179}
180
181/*
182 * called from commit_transaction. Writes changed device replace state to
183 * disk.
184 */
185int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
186 struct btrfs_fs_info *fs_info)
187{
188 int ret;
189 struct btrfs_root *dev_root = fs_info->dev_root;
190 struct btrfs_path *path;
191 struct btrfs_key key;
192 struct extent_buffer *eb;
193 struct btrfs_dev_replace_item *ptr;
194 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
195
196 btrfs_dev_replace_lock(dev_replace);
197 if (!dev_replace->is_valid ||
198 !dev_replace->item_needs_writeback) {
199 btrfs_dev_replace_unlock(dev_replace);
200 return 0;
201 }
202 btrfs_dev_replace_unlock(dev_replace);
203
204 key.objectid = 0;
205 key.type = BTRFS_DEV_REPLACE_KEY;
206 key.offset = 0;
207
208 path = btrfs_alloc_path();
209 if (!path) {
210 ret = -ENOMEM;
211 goto out;
212 }
213 ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1);
214 if (ret < 0) {
215 pr_warn("btrfs: error %d while searching for dev_replace item!\n",
216 ret);
217 goto out;
218 }
219
220 if (ret == 0 &&
221 btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) {
222 /*
223 * need to delete old one and insert a new one.
224 * Since no attempt is made to recover any old state, if the
225 * dev_replace state is 'running', the data on the target
226 * drive is lost.
227 * It would be possible to recover the state: just make sure
228 * that the beginning of the item is never changed and always
229 * contains all the essential information. Then read this
230 * minimal set of information and use it as a base for the
231 * new state.
232 */
233 ret = btrfs_del_item(trans, dev_root, path);
234 if (ret != 0) {
235 pr_warn("btrfs: delete too small dev_replace item failed %d!\n",
236 ret);
237 goto out;
238 }
239 ret = 1;
240 }
241
242 if (ret == 1) {
243 /* need to insert a new item */
244 btrfs_release_path(path);
245 ret = btrfs_insert_empty_item(trans, dev_root, path,
246 &key, sizeof(*ptr));
247 if (ret < 0) {
248 pr_warn("btrfs: insert dev_replace item failed %d!\n",
249 ret);
250 goto out;
251 }
252 }
253
254 eb = path->nodes[0];
255 ptr = btrfs_item_ptr(eb, path->slots[0],
256 struct btrfs_dev_replace_item);
257
258 btrfs_dev_replace_lock(dev_replace);
259 if (dev_replace->srcdev)
260 btrfs_set_dev_replace_src_devid(eb, ptr,
261 dev_replace->srcdev->devid);
262 else
263 btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1);
264 btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr,
265 dev_replace->cont_reading_from_srcdev_mode);
266 btrfs_set_dev_replace_replace_state(eb, ptr,
267 dev_replace->replace_state);
268 btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started);
269 btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped);
270 btrfs_set_dev_replace_num_write_errors(eb, ptr,
271 atomic64_read(&dev_replace->num_write_errors));
272 btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr,
273 atomic64_read(&dev_replace->num_uncorrectable_read_errors));
274 dev_replace->cursor_left_last_write_of_item =
275 dev_replace->cursor_left;
276 btrfs_set_dev_replace_cursor_left(eb, ptr,
277 dev_replace->cursor_left_last_write_of_item);
278 btrfs_set_dev_replace_cursor_right(eb, ptr,
279 dev_replace->cursor_right);
280 dev_replace->item_needs_writeback = 0;
281 btrfs_dev_replace_unlock(dev_replace);
282
283 btrfs_mark_buffer_dirty(eb);
284
285out:
286 btrfs_free_path(path);
287
288 return ret;
289}
290
291void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info)
292{
293 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
294
295 dev_replace->committed_cursor_left =
296 dev_replace->cursor_left_last_write_of_item;
297}
298
299static u64 btrfs_get_seconds_since_1970(void)
300{
301 struct timespec t = CURRENT_TIME_SEC;
302
303 return t.tv_sec;
304}
305
306int btrfs_dev_replace_start(struct btrfs_root *root,
307 struct btrfs_ioctl_dev_replace_args *args)
308{
309 struct btrfs_trans_handle *trans;
310 struct btrfs_fs_info *fs_info = root->fs_info;
311 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
312 int ret;
313 struct btrfs_device *tgt_device = NULL;
314 struct btrfs_device *src_device = NULL;
315
316 switch (args->start.cont_reading_from_srcdev_mode) {
317 case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
318 case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
319 break;
320 default:
321 return -EINVAL;
322 }
323
324 if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
325 args->start.tgtdev_name[0] == '\0')
326 return -EINVAL;
327
328 mutex_lock(&fs_info->volume_mutex);
329 ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name,
330 &tgt_device);
331 if (ret) {
332 pr_err("btrfs: target device %s is invalid!\n",
333 args->start.tgtdev_name);
334 mutex_unlock(&fs_info->volume_mutex);
335 return -EINVAL;
336 }
337
338 ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid,
339 args->start.srcdev_name,
340 &src_device);
341 mutex_unlock(&fs_info->volume_mutex);
342 if (ret) {
343 ret = -EINVAL;
344 goto leave_no_lock;
345 }
346
347 if (tgt_device->total_bytes < src_device->total_bytes) {
348 pr_err("btrfs: target device is smaller than source device!\n");
349 ret = -EINVAL;
350 goto leave_no_lock;
351 }
352
353 btrfs_dev_replace_lock(dev_replace);
354 switch (dev_replace->replace_state) {
355 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
356 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
357 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
358 break;
359 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
360 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
361 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
362 goto leave;
363 }
364
365 dev_replace->cont_reading_from_srcdev_mode =
366 args->start.cont_reading_from_srcdev_mode;
367 WARN_ON(!src_device);
368 dev_replace->srcdev = src_device;
369 WARN_ON(!tgt_device);
370 dev_replace->tgtdev = tgt_device;
371
372 printk_in_rcu(KERN_INFO
373 "btrfs: dev_replace from %s (devid %llu) to %s) started\n",
374 src_device->missing ? "<missing disk>" :
375 rcu_str_deref(src_device->name),
376 src_device->devid,
377 rcu_str_deref(tgt_device->name));
378
379 tgt_device->total_bytes = src_device->total_bytes;
380 tgt_device->disk_total_bytes = src_device->disk_total_bytes;
381 tgt_device->bytes_used = src_device->bytes_used;
382
383 /*
384 * from now on, the writes to the srcdev are all duplicated to
385 * go to the tgtdev as well (refer to btrfs_map_block()).
386 */
387 dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
388 dev_replace->time_started = btrfs_get_seconds_since_1970();
389 dev_replace->cursor_left = 0;
390 dev_replace->committed_cursor_left = 0;
391 dev_replace->cursor_left_last_write_of_item = 0;
392 dev_replace->cursor_right = 0;
393 dev_replace->is_valid = 1;
394 dev_replace->item_needs_writeback = 1;
395 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
396 btrfs_dev_replace_unlock(dev_replace);
397
398 btrfs_wait_ordered_extents(root, 0);
399
400 /* force writing the updated state information to disk */
401 trans = btrfs_start_transaction(root, 0);
402 if (IS_ERR(trans)) {
403 ret = PTR_ERR(trans);
404 btrfs_dev_replace_lock(dev_replace);
405 goto leave;
406 }
407
408 ret = btrfs_commit_transaction(trans, root);
409 WARN_ON(ret);
410
411 /* the disk copy procedure reuses the scrub code */
412 ret = btrfs_scrub_dev(fs_info, src_device->devid, 0,
413 src_device->total_bytes,
414 &dev_replace->scrub_progress, 0, 1);
415
416 ret = btrfs_dev_replace_finishing(root->fs_info, ret);
417 WARN_ON(ret);
418
419 return 0;
420
421leave:
422 dev_replace->srcdev = NULL;
423 dev_replace->tgtdev = NULL;
424 btrfs_dev_replace_unlock(dev_replace);
425leave_no_lock:
426 if (tgt_device)
427 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
428 return ret;
429}
430
431static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
432 int scrub_ret)
433{
434 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
435 struct btrfs_device *tgt_device;
436 struct btrfs_device *src_device;
437 struct btrfs_root *root = fs_info->tree_root;
438 u8 uuid_tmp[BTRFS_UUID_SIZE];
439 struct btrfs_trans_handle *trans;
440 int ret = 0;
441
442 /* don't allow cancel or unmount to disturb the finishing procedure */
443 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
444
445 btrfs_dev_replace_lock(dev_replace);
446 /* was the operation canceled, or is it finished? */
447 if (dev_replace->replace_state !=
448 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) {
449 btrfs_dev_replace_unlock(dev_replace);
450 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
451 return 0;
452 }
453
454 tgt_device = dev_replace->tgtdev;
455 src_device = dev_replace->srcdev;
456 btrfs_dev_replace_unlock(dev_replace);
457
458 /* replace old device with new one in mapping tree */
459 if (!scrub_ret)
460 btrfs_dev_replace_update_device_in_mapping_tree(fs_info,
461 src_device,
462 tgt_device);
463
464 /*
465 * flush all outstanding I/O and inode extent mappings before the
466 * copy operation is declared as being finished
467 */
468 btrfs_start_delalloc_inodes(root, 0);
469 btrfs_wait_ordered_extents(root, 0);
470
471 trans = btrfs_start_transaction(root, 0);
472 if (IS_ERR(trans)) {
473 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
474 return PTR_ERR(trans);
475 }
476 ret = btrfs_commit_transaction(trans, root);
477 WARN_ON(ret);
478
479 /* keep away write_all_supers() during the finishing procedure */
480 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
481 btrfs_dev_replace_lock(dev_replace);
482 dev_replace->replace_state =
483 scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
484 : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED;
485 dev_replace->tgtdev = NULL;
486 dev_replace->srcdev = NULL;
487 dev_replace->time_stopped = btrfs_get_seconds_since_1970();
488 dev_replace->item_needs_writeback = 1;
489
490 if (scrub_ret) {
491 printk_in_rcu(KERN_ERR
492 "btrfs: btrfs_scrub_dev(%s, %llu, %s) failed %d\n",
493 src_device->missing ? "<missing disk>" :
494 rcu_str_deref(src_device->name),
495 src_device->devid,
496 rcu_str_deref(tgt_device->name), scrub_ret);
497 btrfs_dev_replace_unlock(dev_replace);
498 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
499 if (tgt_device)
500 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
501 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
502
503 return 0;
504 }
505
506 printk_in_rcu(KERN_INFO
507 "btrfs: dev_replace from %s (devid %llu) to %s) finished\n",
508 src_device->missing ? "<missing disk>" :
509 rcu_str_deref(src_device->name),
510 src_device->devid,
511 rcu_str_deref(tgt_device->name));
512 tgt_device->is_tgtdev_for_dev_replace = 0;
513 tgt_device->devid = src_device->devid;
514 src_device->devid = BTRFS_DEV_REPLACE_DEVID;
515 tgt_device->bytes_used = src_device->bytes_used;
516 memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp));
517 memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid));
518 memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid));
519 tgt_device->total_bytes = src_device->total_bytes;
520 tgt_device->disk_total_bytes = src_device->disk_total_bytes;
521 tgt_device->bytes_used = src_device->bytes_used;
522 if (fs_info->sb->s_bdev == src_device->bdev)
523 fs_info->sb->s_bdev = tgt_device->bdev;
524 if (fs_info->fs_devices->latest_bdev == src_device->bdev)
525 fs_info->fs_devices->latest_bdev = tgt_device->bdev;
526 list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
527
528 btrfs_rm_dev_replace_srcdev(fs_info, src_device);
529 if (src_device->bdev) {
530 /* zero out the old super */
531 btrfs_scratch_superblock(src_device);
532 }
533 /*
534 * this is again a consistent state where no dev_replace procedure
535 * is running, the target device is part of the filesystem, the
536 * source device is not part of the filesystem anymore and its 1st
537 * superblock is scratched out so that it is no longer marked to
538 * belong to this filesystem.
539 */
540 btrfs_dev_replace_unlock(dev_replace);
541 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
542
543 /* write back the superblocks */
544 trans = btrfs_start_transaction(root, 0);
545 if (!IS_ERR(trans))
546 btrfs_commit_transaction(trans, root);
547
548 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
549
550 return 0;
551}
552
553static void btrfs_dev_replace_update_device_in_mapping_tree(
554 struct btrfs_fs_info *fs_info,
555 struct btrfs_device *srcdev,
556 struct btrfs_device *tgtdev)
557{
558 struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
559 struct extent_map *em;
560 struct map_lookup *map;
561 u64 start = 0;
562 int i;
563
564 write_lock(&em_tree->lock);
565 do {
566 em = lookup_extent_mapping(em_tree, start, (u64)-1);
567 if (!em)
568 break;
569 map = (struct map_lookup *)em->bdev;
570 for (i = 0; i < map->num_stripes; i++)
571 if (srcdev == map->stripes[i].dev)
572 map->stripes[i].dev = tgtdev;
573 start = em->start + em->len;
574 free_extent_map(em);
575 } while (start);
576 write_unlock(&em_tree->lock);
577}
578
579static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid,
580 char *srcdev_name,
581 struct btrfs_device **device)
582{
583 int ret;
584
585 if (srcdevid) {
586 ret = 0;
587 *device = btrfs_find_device(root->fs_info, srcdevid, NULL,
588 NULL);
589 if (!*device)
590 ret = -ENOENT;
591 } else {
592 ret = btrfs_find_device_missing_or_by_path(root, srcdev_name,
593 device);
594 }
595 return ret;
596}
597
598void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
599 struct btrfs_ioctl_dev_replace_args *args)
600{
601 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
602
603 btrfs_dev_replace_lock(dev_replace);
604 /* even if !dev_replace_is_valid, the values are good enough for
605 * the replace_status ioctl */
606 args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
607 args->status.replace_state = dev_replace->replace_state;
608 args->status.time_started = dev_replace->time_started;
609 args->status.time_stopped = dev_replace->time_stopped;
610 args->status.num_write_errors =
611 atomic64_read(&dev_replace->num_write_errors);
612 args->status.num_uncorrectable_read_errors =
613 atomic64_read(&dev_replace->num_uncorrectable_read_errors);
614 switch (dev_replace->replace_state) {
615 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
616 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
617 args->status.progress_1000 = 0;
618 break;
619 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
620 args->status.progress_1000 = 1000;
621 break;
622 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
623 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
624 args->status.progress_1000 = div64_u64(dev_replace->cursor_left,
625 div64_u64(dev_replace->srcdev->total_bytes, 1000));
626 break;
627 }
628 btrfs_dev_replace_unlock(dev_replace);
629}
630
631int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info,
632 struct btrfs_ioctl_dev_replace_args *args)
633{
634 args->result = __btrfs_dev_replace_cancel(fs_info);
635 return 0;
636}
637
638static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info)
639{
640 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
641 struct btrfs_device *tgt_device = NULL;
642 struct btrfs_trans_handle *trans;
643 struct btrfs_root *root = fs_info->tree_root;
644 u64 result;
645 int ret;
646
647 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
648 btrfs_dev_replace_lock(dev_replace);
649 switch (dev_replace->replace_state) {
650 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
651 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
652 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
653 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED;
654 btrfs_dev_replace_unlock(dev_replace);
655 goto leave;
656 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
657 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
658 result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
659 tgt_device = dev_replace->tgtdev;
660 dev_replace->tgtdev = NULL;
661 dev_replace->srcdev = NULL;
662 break;
663 }
664 dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED;
665 dev_replace->time_stopped = btrfs_get_seconds_since_1970();
666 dev_replace->item_needs_writeback = 1;
667 btrfs_dev_replace_unlock(dev_replace);
668 btrfs_scrub_cancel(fs_info);
669
670 trans = btrfs_start_transaction(root, 0);
671 if (IS_ERR(trans)) {
672 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
673 return PTR_ERR(trans);
674 }
675 ret = btrfs_commit_transaction(trans, root);
676 WARN_ON(ret);
677 if (tgt_device)
678 btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
679
680leave:
681 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
682 return result;
683}
684
685void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info)
686{
687 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
688
689 mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
690 btrfs_dev_replace_lock(dev_replace);
691 switch (dev_replace->replace_state) {
692 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
693 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
694 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
695 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
696 break;
697 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
698 dev_replace->replace_state =
699 BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
700 dev_replace->time_stopped = btrfs_get_seconds_since_1970();
701 dev_replace->item_needs_writeback = 1;
702 pr_info("btrfs: suspending dev_replace for unmount\n");
703 break;
704 }
705
706 btrfs_dev_replace_unlock(dev_replace);
707 mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
708}
709
710/* resume dev_replace procedure that was interrupted by unmount */
711int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
712{
713 struct task_struct *task;
714 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
715
716 btrfs_dev_replace_lock(dev_replace);
717 switch (dev_replace->replace_state) {
718 case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
719 case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
720 case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
721 btrfs_dev_replace_unlock(dev_replace);
722 return 0;
723 case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
724 break;
725 case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
726 dev_replace->replace_state =
727 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED;
728 break;
729 }
730 if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) {
731 pr_info("btrfs: cannot continue dev_replace, tgtdev is missing\n"
732 "btrfs: you may cancel the operation after 'mount -o degraded'\n");
733 btrfs_dev_replace_unlock(dev_replace);
734 return 0;
735 }
736 btrfs_dev_replace_unlock(dev_replace);
737
738 WARN_ON(atomic_xchg(
739 &fs_info->mutually_exclusive_operation_running, 1));
740 task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl");
741 return PTR_RET(task);
742}
743
744static 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
773static 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
787int 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
814void 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) {
818acquire_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
842void 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}
diff --git a/fs/btrfs/dev-replace.h b/fs/btrfs/dev-replace.h
index 1fb5c89037e..20035cbbf02 100644
--- a/fs/btrfs/dev-replace.h
+++ b/fs/btrfs/dev-replace.h
@@ -19,6 +19,24 @@
19#if !defined(__BTRFS_DEV_REPLACE__) 19#if !defined(__BTRFS_DEV_REPLACE__)
20#define __BTRFS_DEV_REPLACE__ 20#define __BTRFS_DEV_REPLACE__
21 21
22struct btrfs_ioctl_dev_replace_args;
23
24int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info);
25int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
26 struct btrfs_fs_info *fs_info);
27void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info);
28int btrfs_dev_replace_start(struct btrfs_root *root,
29 struct btrfs_ioctl_dev_replace_args *args);
30void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
31 struct btrfs_ioctl_dev_replace_args *args);
32int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info,
33 struct btrfs_ioctl_dev_replace_args *args);
34void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info);
35int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info);
36int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace);
37void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace);
38void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace);
39
22static inline void btrfs_dev_replace_stats_inc(atomic64_t *stat_value) 40static inline void btrfs_dev_replace_stats_inc(atomic64_t *stat_value)
23{ 41{
24 atomic64_inc(stat_value); 42 atomic64_inc(stat_value);
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 731e2875ab9..62006ba0271 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -123,6 +123,48 @@ struct btrfs_ioctl_scrub_args {
123 __u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8]; 123 __u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
124}; 124};
125 125
126#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
127#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
128struct btrfs_ioctl_dev_replace_start_params {
129 __u64 srcdevid; /* in, if 0, use srcdev_name instead */
130 __u8 srcdev_name[BTRFS_PATH_NAME_MAX + 1]; /* in */
131 __u8 tgtdev_name[BTRFS_PATH_NAME_MAX + 1]; /* in */
132 __u64 cont_reading_from_srcdev_mode; /* in, see #define
133 * above */
134};
135
136#define BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED 0
137#define BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED 1
138#define BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED 2
139#define BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED 3
140#define BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED 4
141struct btrfs_ioctl_dev_replace_status_params {
142 __u64 replace_state; /* out, see #define above */
143 __u64 progress_1000; /* out, 0 <= x <= 1000 */
144 __u64 time_started; /* out, seconds since 1-Jan-1970 */
145 __u64 time_stopped; /* out, seconds since 1-Jan-1970 */
146 __u64 num_write_errors; /* out */
147 __u64 num_uncorrectable_read_errors; /* out */
148};
149
150#define BTRFS_IOCTL_DEV_REPLACE_CMD_START 0
151#define BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS 1
152#define BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL 2
153#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR 0
154#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED 1
155#define BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED 2
156struct btrfs_ioctl_dev_replace_args {
157 __u64 cmd; /* in */
158 __u64 result; /* out */
159
160 union {
161 struct btrfs_ioctl_dev_replace_start_params start;
162 struct btrfs_ioctl_dev_replace_status_params status;
163 }; /* in/out */
164
165 __u64 spare[64];
166};
167
126#define BTRFS_DEVICE_PATH_NAME_MAX 1024 168#define BTRFS_DEVICE_PATH_NAME_MAX 1024
127struct btrfs_ioctl_dev_info_args { 169struct btrfs_ioctl_dev_info_args {
128 __u64 devid; /* in/out */ 170 __u64 devid; /* in/out */
@@ -453,4 +495,7 @@ struct btrfs_ioctl_send_args {
453 struct btrfs_ioctl_qgroup_limit_args) 495 struct btrfs_ioctl_qgroup_limit_args)
454#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \ 496#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
455 struct btrfs_ioctl_get_dev_stats) 497 struct btrfs_ioctl_get_dev_stats)
498#define BTRFS_IOC_DEV_REPLACE _IOWR(BTRFS_IOCTL_MAGIC, 53, \
499 struct btrfs_ioctl_dev_replace_args)
500
456#endif 501#endif
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 415862885b6..5777e6a9aab 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1537,6 +1537,53 @@ error_undo:
1537 goto error_brelse; 1537 goto error_brelse;
1538} 1538}
1539 1539
1540void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
1541 struct btrfs_device *srcdev)
1542{
1543 WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex));
1544 list_del_rcu(&srcdev->dev_list);
1545 list_del_rcu(&srcdev->dev_alloc_list);
1546 fs_info->fs_devices->num_devices--;
1547 if (srcdev->missing) {
1548 fs_info->fs_devices->missing_devices--;
1549 fs_info->fs_devices->rw_devices++;
1550 }
1551 if (srcdev->can_discard)
1552 fs_info->fs_devices->num_can_discard--;
1553 if (srcdev->bdev)
1554 fs_info->fs_devices->open_devices--;
1555
1556 call_rcu(&srcdev->rcu, free_device);
1557}
1558
1559void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
1560 struct btrfs_device *tgtdev)
1561{
1562 struct btrfs_device *next_device;
1563
1564 WARN_ON(!tgtdev);
1565 mutex_lock(&fs_info->fs_devices->device_list_mutex);
1566 if (tgtdev->bdev) {
1567 btrfs_scratch_superblock(tgtdev);
1568 fs_info->fs_devices->open_devices--;
1569 }
1570 fs_info->fs_devices->num_devices--;
1571 if (tgtdev->can_discard)
1572 fs_info->fs_devices->num_can_discard++;
1573
1574 next_device = list_entry(fs_info->fs_devices->devices.next,
1575 struct btrfs_device, dev_list);
1576 if (tgtdev->bdev == fs_info->sb->s_bdev)
1577 fs_info->sb->s_bdev = next_device->bdev;
1578 if (tgtdev->bdev == fs_info->fs_devices->latest_bdev)
1579 fs_info->fs_devices->latest_bdev = next_device->bdev;
1580 list_del_rcu(&tgtdev->dev_list);
1581
1582 call_rcu(&tgtdev->rcu, free_device);
1583
1584 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
1585}
1586
1540int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path, 1587int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path,
1541 struct btrfs_device **device) 1588 struct btrfs_device **device)
1542{ 1589{
@@ -1931,6 +1978,98 @@ error:
1931 return ret; 1978 return ret;
1932} 1979}
1933 1980
1981int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
1982 struct btrfs_device **device_out)
1983{
1984 struct request_queue *q;
1985 struct btrfs_device *device;
1986 struct block_device *bdev;
1987 struct btrfs_fs_info *fs_info = root->fs_info;
1988 struct list_head *devices;
1989 struct rcu_string *name;
1990 int ret = 0;
1991
1992 *device_out = NULL;
1993 if (fs_info->fs_devices->seeding)
1994 return -EINVAL;
1995
1996 bdev = blkdev_get_by_path(device_path, FMODE_WRITE | FMODE_EXCL,
1997 fs_info->bdev_holder);
1998 if (IS_ERR(bdev))
1999 return PTR_ERR(bdev);
2000
2001 filemap_write_and_wait(bdev->bd_inode->i_mapping);
2002
2003 devices = &fs_info->fs_devices->devices;
2004 list_for_each_entry(device, devices, dev_list) {
2005 if (device->bdev == bdev) {
2006 ret = -EEXIST;
2007 goto error;
2008 }
2009 }
2010
2011 device = kzalloc(sizeof(*device), GFP_NOFS);
2012 if (!device) {
2013 ret = -ENOMEM;
2014 goto error;
2015 }
2016
2017 name = rcu_string_strdup(device_path, GFP_NOFS);
2018 if (!name) {
2019 kfree(device);
2020 ret = -ENOMEM;
2021 goto error;
2022 }
2023 rcu_assign_pointer(device->name, name);
2024
2025 q = bdev_get_queue(bdev);
2026 if (blk_queue_discard(q))
2027 device->can_discard = 1;
2028 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
2029 device->writeable = 1;
2030 device->work.func = pending_bios_fn;
2031 generate_random_uuid(device->uuid);
2032 device->devid = BTRFS_DEV_REPLACE_DEVID;
2033 spin_lock_init(&device->io_lock);
2034 device->generation = 0;
2035 device->io_width = root->sectorsize;
2036 device->io_align = root->sectorsize;
2037 device->sector_size = root->sectorsize;
2038 device->total_bytes = i_size_read(bdev->bd_inode);
2039 device->disk_total_bytes = device->total_bytes;
2040 device->dev_root = fs_info->dev_root;
2041 device->bdev = bdev;
2042 device->in_fs_metadata = 1;
2043 device->is_tgtdev_for_dev_replace = 1;
2044 device->mode = FMODE_EXCL;
2045 set_blocksize(device->bdev, 4096);
2046 device->fs_devices = fs_info->fs_devices;
2047 list_add(&device->dev_list, &fs_info->fs_devices->devices);
2048 fs_info->fs_devices->num_devices++;
2049 fs_info->fs_devices->open_devices++;
2050 if (device->can_discard)
2051 fs_info->fs_devices->num_can_discard++;
2052 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
2053
2054 *device_out = device;
2055 return ret;
2056
2057error:
2058 blkdev_put(bdev, FMODE_EXCL);
2059 return ret;
2060}
2061
2062void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
2063 struct btrfs_device *tgtdev)
2064{
2065 WARN_ON(fs_info->fs_devices->rw_devices == 0);
2066 tgtdev->io_width = fs_info->dev_root->sectorsize;
2067 tgtdev->io_align = fs_info->dev_root->sectorsize;
2068 tgtdev->sector_size = fs_info->dev_root->sectorsize;
2069 tgtdev->dev_root = fs_info->dev_root;
2070 tgtdev->in_fs_metadata = 1;
2071}
2072
1934static noinline int btrfs_update_device(struct btrfs_trans_handle *trans, 2073static noinline int btrfs_update_device(struct btrfs_trans_handle *trans,
1935 struct btrfs_device *device) 2074 struct btrfs_device *device)
1936{ 2075{
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 8fd5a4d8acc..58d79375dea 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -286,6 +286,8 @@ struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
286 u8 *uuid, u8 *fsid); 286 u8 *uuid, u8 *fsid);
287int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 287int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
288int btrfs_init_new_device(struct btrfs_root *root, char *path); 288int btrfs_init_new_device(struct btrfs_root *root, char *path);
289int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
290 struct btrfs_device **device_out);
289int btrfs_balance(struct btrfs_balance_control *bctl, 291int btrfs_balance(struct btrfs_balance_control *bctl,
290 struct btrfs_ioctl_balance_args *bargs); 292 struct btrfs_ioctl_balance_args *bargs);
291int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); 293int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
@@ -302,6 +304,12 @@ int btrfs_get_dev_stats(struct btrfs_root *root,
302int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); 304int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
303int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, 305int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
304 struct btrfs_fs_info *fs_info); 306 struct btrfs_fs_info *fs_info);
307void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
308 struct btrfs_device *srcdev);
309void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
310 struct btrfs_device *tgtdev);
311void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
312 struct btrfs_device *tgtdev);
305int btrfs_scratch_superblock(struct btrfs_device *device); 313int btrfs_scratch_superblock(struct btrfs_device *device);
306 314
307static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, 315static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-17 10:24:12 -0400