Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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> |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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" |
Anand Jain | 49c6f73 | 2014-06-03 11:36:02 +0800 | [diff] [blame] | 39 | #include "sysfs.h" |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 40 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 47 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); |
| 48 | static int btrfs_dev_replace_kthread(void *data); |
| 49 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); |
| 50 | |
| 51 | |
| 52 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) |
| 53 | { |
| 54 | struct btrfs_key key; |
| 55 | struct btrfs_root *dev_root = fs_info->dev_root; |
| 56 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 57 | struct extent_buffer *eb; |
| 58 | int slot; |
| 59 | int ret = 0; |
| 60 | struct btrfs_path *path = NULL; |
| 61 | int item_size; |
| 62 | struct btrfs_dev_replace_item *ptr; |
| 63 | u64 src_devid; |
| 64 | |
| 65 | path = btrfs_alloc_path(); |
| 66 | if (!path) { |
| 67 | ret = -ENOMEM; |
| 68 | goto out; |
| 69 | } |
| 70 | |
| 71 | key.objectid = 0; |
| 72 | key.type = BTRFS_DEV_REPLACE_KEY; |
| 73 | key.offset = 0; |
| 74 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); |
| 75 | if (ret) { |
| 76 | no_valid_dev_replace_entry_found: |
| 77 | ret = 0; |
| 78 | dev_replace->replace_state = |
| 79 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; |
| 80 | dev_replace->cont_reading_from_srcdev_mode = |
| 81 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; |
| 82 | dev_replace->replace_state = 0; |
| 83 | dev_replace->time_started = 0; |
| 84 | dev_replace->time_stopped = 0; |
| 85 | atomic64_set(&dev_replace->num_write_errors, 0); |
| 86 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); |
| 87 | dev_replace->cursor_left = 0; |
| 88 | dev_replace->committed_cursor_left = 0; |
| 89 | dev_replace->cursor_left_last_write_of_item = 0; |
| 90 | dev_replace->cursor_right = 0; |
| 91 | dev_replace->srcdev = NULL; |
| 92 | dev_replace->tgtdev = NULL; |
| 93 | dev_replace->is_valid = 0; |
| 94 | dev_replace->item_needs_writeback = 0; |
| 95 | goto out; |
| 96 | } |
| 97 | slot = path->slots[0]; |
| 98 | eb = path->nodes[0]; |
| 99 | item_size = btrfs_item_size_nr(eb, slot); |
| 100 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); |
| 101 | |
| 102 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 103 | btrfs_warn(fs_info, |
| 104 | "dev_replace entry found has unexpected size, ignore entry"); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 105 | goto no_valid_dev_replace_entry_found; |
| 106 | } |
| 107 | |
| 108 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); |
| 109 | dev_replace->cont_reading_from_srcdev_mode = |
| 110 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); |
| 111 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); |
| 112 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); |
| 113 | dev_replace->time_stopped = |
| 114 | btrfs_dev_replace_time_stopped(eb, ptr); |
| 115 | atomic64_set(&dev_replace->num_write_errors, |
| 116 | btrfs_dev_replace_num_write_errors(eb, ptr)); |
| 117 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, |
| 118 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); |
| 119 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); |
| 120 | dev_replace->committed_cursor_left = dev_replace->cursor_left; |
| 121 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; |
| 122 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); |
| 123 | dev_replace->is_valid = 1; |
| 124 | |
| 125 | dev_replace->item_needs_writeback = 0; |
| 126 | switch (dev_replace->replace_state) { |
| 127 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 128 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 129 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 130 | dev_replace->srcdev = NULL; |
| 131 | dev_replace->tgtdev = NULL; |
| 132 | break; |
| 133 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 134 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 135 | dev_replace->srcdev = btrfs_find_device(fs_info, src_devid, |
| 136 | NULL, NULL); |
| 137 | dev_replace->tgtdev = btrfs_find_device(fs_info, |
| 138 | BTRFS_DEV_REPLACE_DEVID, |
| 139 | NULL, NULL); |
| 140 | /* |
| 141 | * allow 'btrfs dev replace_cancel' if src/tgt device is |
| 142 | * missing |
| 143 | */ |
| 144 | if (!dev_replace->srcdev && |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 145 | !btrfs_test_opt(fs_info, DEGRADED)) { |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 146 | ret = -EIO; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 147 | btrfs_warn(fs_info, |
| 148 | "cannot mount because device replace operation is ongoing and"); |
| 149 | btrfs_warn(fs_info, |
| 150 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", |
| 151 | src_devid); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 152 | } |
| 153 | if (!dev_replace->tgtdev && |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 154 | !btrfs_test_opt(fs_info, DEGRADED)) { |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 155 | ret = -EIO; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 156 | btrfs_warn(fs_info, |
| 157 | "cannot mount because device replace operation is ongoing and"); |
| 158 | btrfs_warn(fs_info, |
| 159 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", |
Geert Uytterhoeven | 6e71c47 | 2013-08-20 13:20:08 +0200 | [diff] [blame] | 160 | BTRFS_DEV_REPLACE_DEVID); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 161 | } |
| 162 | if (dev_replace->tgtdev) { |
| 163 | if (dev_replace->srcdev) { |
| 164 | dev_replace->tgtdev->total_bytes = |
| 165 | dev_replace->srcdev->total_bytes; |
| 166 | dev_replace->tgtdev->disk_total_bytes = |
| 167 | dev_replace->srcdev->disk_total_bytes; |
Miao Xie | 935e5cc | 2014-09-03 21:35:33 +0800 | [diff] [blame] | 168 | dev_replace->tgtdev->commit_total_bytes = |
| 169 | dev_replace->srcdev->commit_total_bytes; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 170 | dev_replace->tgtdev->bytes_used = |
| 171 | dev_replace->srcdev->bytes_used; |
Miao Xie | ce7213c | 2014-09-03 21:35:34 +0800 | [diff] [blame] | 172 | dev_replace->tgtdev->commit_bytes_used = |
| 173 | dev_replace->srcdev->commit_bytes_used; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 174 | } |
| 175 | dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1; |
| 176 | btrfs_init_dev_replace_tgtdev_for_resume(fs_info, |
| 177 | dev_replace->tgtdev); |
| 178 | } |
| 179 | break; |
| 180 | } |
| 181 | |
| 182 | out: |
Tsutomu Itoh | 527afb4 | 2015-08-19 14:55:00 +0900 | [diff] [blame] | 183 | btrfs_free_path(path); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 202 | btrfs_dev_replace_lock(dev_replace, 0); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 203 | if (!dev_replace->is_valid || |
| 204 | !dev_replace->item_needs_writeback) { |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 205 | btrfs_dev_replace_unlock(dev_replace, 0); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 206 | return 0; |
| 207 | } |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 208 | btrfs_dev_replace_unlock(dev_replace, 0); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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) { |
Jeff Mahoney | 5d163e0 | 2016-09-20 10:05:00 -0400 | [diff] [blame] | 221 | btrfs_warn(fs_info, |
| 222 | "error %d while searching for dev_replace item!", |
| 223 | ret); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 224 | goto out; |
| 225 | } |
| 226 | |
| 227 | if (ret == 0 && |
| 228 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { |
| 229 | /* |
| 230 | * need to delete old one and insert a new one. |
| 231 | * Since no attempt is made to recover any old state, if the |
| 232 | * dev_replace state is 'running', the data on the target |
| 233 | * drive is lost. |
| 234 | * It would be possible to recover the state: just make sure |
| 235 | * that the beginning of the item is never changed and always |
| 236 | * contains all the essential information. Then read this |
| 237 | * minimal set of information and use it as a base for the |
| 238 | * new state. |
| 239 | */ |
| 240 | ret = btrfs_del_item(trans, dev_root, path); |
| 241 | if (ret != 0) { |
Jeff Mahoney | 5d163e0 | 2016-09-20 10:05:00 -0400 | [diff] [blame] | 242 | btrfs_warn(fs_info, |
| 243 | "delete too small dev_replace item failed %d!", |
| 244 | ret); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 245 | goto out; |
| 246 | } |
| 247 | ret = 1; |
| 248 | } |
| 249 | |
| 250 | if (ret == 1) { |
| 251 | /* need to insert a new item */ |
| 252 | btrfs_release_path(path); |
| 253 | ret = btrfs_insert_empty_item(trans, dev_root, path, |
| 254 | &key, sizeof(*ptr)); |
| 255 | if (ret < 0) { |
Jeff Mahoney | 5d163e0 | 2016-09-20 10:05:00 -0400 | [diff] [blame] | 256 | btrfs_warn(fs_info, |
| 257 | "insert dev_replace item failed %d!", ret); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 258 | goto out; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | eb = path->nodes[0]; |
| 263 | ptr = btrfs_item_ptr(eb, path->slots[0], |
| 264 | struct btrfs_dev_replace_item); |
| 265 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 266 | btrfs_dev_replace_lock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 267 | if (dev_replace->srcdev) |
| 268 | btrfs_set_dev_replace_src_devid(eb, ptr, |
| 269 | dev_replace->srcdev->devid); |
| 270 | else |
| 271 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); |
| 272 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, |
| 273 | dev_replace->cont_reading_from_srcdev_mode); |
| 274 | btrfs_set_dev_replace_replace_state(eb, ptr, |
| 275 | dev_replace->replace_state); |
| 276 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); |
| 277 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); |
| 278 | btrfs_set_dev_replace_num_write_errors(eb, ptr, |
| 279 | atomic64_read(&dev_replace->num_write_errors)); |
| 280 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, |
| 281 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); |
| 282 | dev_replace->cursor_left_last_write_of_item = |
| 283 | dev_replace->cursor_left; |
| 284 | btrfs_set_dev_replace_cursor_left(eb, ptr, |
| 285 | dev_replace->cursor_left_last_write_of_item); |
| 286 | btrfs_set_dev_replace_cursor_right(eb, ptr, |
| 287 | dev_replace->cursor_right); |
| 288 | dev_replace->item_needs_writeback = 0; |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 289 | btrfs_dev_replace_unlock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 290 | |
| 291 | btrfs_mark_buffer_dirty(eb); |
| 292 | |
| 293 | out: |
| 294 | btrfs_free_path(path); |
| 295 | |
| 296 | return ret; |
| 297 | } |
| 298 | |
| 299 | void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) |
| 300 | { |
| 301 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 302 | |
| 303 | dev_replace->committed_cursor_left = |
| 304 | dev_replace->cursor_left_last_write_of_item; |
| 305 | } |
| 306 | |
David Sterba | da353f6 | 2017-02-14 17:55:53 +0100 | [diff] [blame] | 307 | int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info, |
| 308 | const char *tgtdev_name, u64 srcdevid, const char *srcdev_name, |
| 309 | int read_src) |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 310 | { |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 311 | struct btrfs_root *root = fs_info->dev_root; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 312 | struct btrfs_trans_handle *trans; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 313 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 314 | int ret; |
| 315 | struct btrfs_device *tgt_device = NULL; |
| 316 | struct btrfs_device *src_device = NULL; |
| 317 | |
Miao Xie | 935e5cc | 2014-09-03 21:35:33 +0800 | [diff] [blame] | 318 | /* the disk copy procedure reuses the scrub code */ |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 319 | mutex_lock(&fs_info->volume_mutex); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 320 | ret = btrfs_find_device_by_devspec(fs_info, srcdevid, |
Anand Jain | b525545 | 2016-03-24 18:48:14 +0800 | [diff] [blame] | 321 | srcdev_name, &src_device); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 322 | if (ret) { |
Miao Xie | 1c43366 | 2014-09-03 21:35:32 +0800 | [diff] [blame] | 323 | mutex_unlock(&fs_info->volume_mutex); |
| 324 | return ret; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 325 | } |
| 326 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 327 | ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name, |
Miao Xie | 1c43366 | 2014-09-03 21:35:32 +0800 | [diff] [blame] | 328 | src_device, &tgt_device); |
| 329 | mutex_unlock(&fs_info->volume_mutex); |
| 330 | if (ret) |
| 331 | return ret; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 332 | |
Anand Jain | 9e271ae | 2015-08-14 18:33:02 +0800 | [diff] [blame] | 333 | /* |
| 334 | * Here we commit the transaction to make sure commit_total_bytes |
| 335 | * of all the devices are updated. |
| 336 | */ |
| 337 | trans = btrfs_attach_transaction(root); |
| 338 | if (!IS_ERR(trans)) { |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 339 | ret = btrfs_commit_transaction(trans); |
Anand Jain | 9e271ae | 2015-08-14 18:33:02 +0800 | [diff] [blame] | 340 | if (ret) |
| 341 | return ret; |
| 342 | } else if (PTR_ERR(trans) != -ENOENT) { |
| 343 | return PTR_ERR(trans); |
| 344 | } |
| 345 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 346 | btrfs_dev_replace_lock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 347 | switch (dev_replace->replace_state) { |
| 348 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 349 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 350 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 351 | break; |
| 352 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 353 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
Anand Jain | b525545 | 2016-03-24 18:48:14 +0800 | [diff] [blame] | 354 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 355 | goto leave; |
| 356 | } |
| 357 | |
Anand Jain | b525545 | 2016-03-24 18:48:14 +0800 | [diff] [blame] | 358 | dev_replace->cont_reading_from_srcdev_mode = read_src; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 359 | WARN_ON(!src_device); |
| 360 | dev_replace->srcdev = src_device; |
| 361 | WARN_ON(!tgt_device); |
| 362 | dev_replace->tgtdev = tgt_device; |
| 363 | |
Anand Jain | fc23c24 | 2016-03-24 18:48:12 +0800 | [diff] [blame] | 364 | btrfs_info_in_rcu(fs_info, |
David Sterba | ecaeb14 | 2015-10-08 09:01:03 +0200 | [diff] [blame] | 365 | "dev_replace from %s (devid %llu) to %s started", |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 366 | src_device->missing ? "<missing disk>" : |
| 367 | rcu_str_deref(src_device->name), |
| 368 | src_device->devid, |
| 369 | rcu_str_deref(tgt_device->name)); |
| 370 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 371 | /* |
| 372 | * from now on, the writes to the srcdev are all duplicated to |
| 373 | * go to the tgtdev as well (refer to btrfs_map_block()). |
| 374 | */ |
| 375 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 376 | dev_replace->time_started = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 377 | dev_replace->cursor_left = 0; |
| 378 | dev_replace->committed_cursor_left = 0; |
| 379 | dev_replace->cursor_left_last_write_of_item = 0; |
| 380 | dev_replace->cursor_right = 0; |
| 381 | dev_replace->is_valid = 1; |
| 382 | dev_replace->item_needs_writeback = 1; |
Yauhen Kharuzhy | 7ccefb9 | 2016-03-29 14:17:48 -0700 | [diff] [blame] | 383 | atomic64_set(&dev_replace->num_write_errors, 0); |
| 384 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 385 | btrfs_dev_replace_unlock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 386 | |
Liu Bo | 73416da | 2015-08-14 18:33:07 +0800 | [diff] [blame] | 387 | ret = btrfs_sysfs_add_device_link(tgt_device->fs_devices, tgt_device); |
| 388 | if (ret) |
Jeff Mahoney | ab8d0fc | 2016-09-20 10:05:02 -0400 | [diff] [blame] | 389 | btrfs_err(fs_info, "kobj add dev failed %d", ret); |
Liu Bo | 73416da | 2015-08-14 18:33:07 +0800 | [diff] [blame] | 390 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 391 | btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 392 | |
| 393 | /* force writing the updated state information to disk */ |
| 394 | trans = btrfs_start_transaction(root, 0); |
| 395 | if (IS_ERR(trans)) { |
| 396 | ret = PTR_ERR(trans); |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 397 | btrfs_dev_replace_lock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 398 | goto leave; |
| 399 | } |
| 400 | |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 401 | ret = btrfs_commit_transaction(trans); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 402 | WARN_ON(ret); |
| 403 | |
| 404 | /* the disk copy procedure reuses the scrub code */ |
| 405 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 406 | btrfs_device_get_total_bytes(src_device), |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 407 | &dev_replace->scrub_progress, 0, 1); |
| 408 | |
Anand Jain | fc23c24 | 2016-03-24 18:48:12 +0800 | [diff] [blame] | 409 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
Eryu Guan | 2fc9f6b | 2014-10-13 12:42:12 +0800 | [diff] [blame] | 410 | if (ret == -EINPROGRESS) { |
Anand Jain | b525545 | 2016-03-24 18:48:14 +0800 | [diff] [blame] | 411 | ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
Eryu Guan | 2fc9f6b | 2014-10-13 12:42:12 +0800 | [diff] [blame] | 412 | } else { |
| 413 | WARN_ON(ret); |
| 414 | } |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 415 | |
Eryu Guan | 2fc9f6b | 2014-10-13 12:42:12 +0800 | [diff] [blame] | 416 | return ret; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 417 | |
| 418 | leave: |
| 419 | dev_replace->srcdev = NULL; |
| 420 | dev_replace->tgtdev = NULL; |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 421 | btrfs_dev_replace_unlock(dev_replace, 1); |
Miao Xie | 1c43366 | 2014-09-03 21:35:32 +0800 | [diff] [blame] | 422 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 423 | return ret; |
| 424 | } |
| 425 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 426 | int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info, |
Anand Jain | b525545 | 2016-03-24 18:48:14 +0800 | [diff] [blame] | 427 | struct btrfs_ioctl_dev_replace_args *args) |
| 428 | { |
| 429 | int ret; |
| 430 | |
| 431 | switch (args->start.cont_reading_from_srcdev_mode) { |
| 432 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: |
| 433 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: |
| 434 | break; |
| 435 | default: |
| 436 | return -EINVAL; |
| 437 | } |
| 438 | |
| 439 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || |
| 440 | args->start.tgtdev_name[0] == '\0') |
| 441 | return -EINVAL; |
| 442 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 443 | ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name, |
Anand Jain | b525545 | 2016-03-24 18:48:14 +0800 | [diff] [blame] | 444 | args->start.srcdevid, |
| 445 | args->start.srcdev_name, |
| 446 | args->start.cont_reading_from_srcdev_mode); |
| 447 | args->result = ret; |
| 448 | /* don't warn if EINPROGRESS, someone else might be running scrub */ |
| 449 | if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS) |
| 450 | ret = 0; |
| 451 | |
| 452 | return ret; |
| 453 | } |
| 454 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 455 | /* |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 456 | * blocked until all in-flight bios operations are finished. |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 457 | */ |
| 458 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) |
| 459 | { |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 460 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
Zhao Lei | 7653947 | 2015-01-20 15:11:38 +0800 | [diff] [blame] | 461 | wait_event(fs_info->replace_wait, !percpu_counter_sum( |
| 462 | &fs_info->bio_counter)); |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | /* |
| 466 | * we have removed target device, it is safe to allow new bios request. |
| 467 | */ |
| 468 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) |
| 469 | { |
| 470 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
David Sterba | 730d9ec | 2015-10-10 18:16:38 +0200 | [diff] [blame] | 471 | wake_up(&fs_info->replace_wait); |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 472 | } |
| 473 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 474 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
| 475 | int scrub_ret) |
| 476 | { |
| 477 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 478 | struct btrfs_device *tgt_device; |
| 479 | struct btrfs_device *src_device; |
| 480 | struct btrfs_root *root = fs_info->tree_root; |
| 481 | u8 uuid_tmp[BTRFS_UUID_SIZE]; |
| 482 | struct btrfs_trans_handle *trans; |
| 483 | int ret = 0; |
| 484 | |
| 485 | /* don't allow cancel or unmount to disturb the finishing procedure */ |
| 486 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| 487 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 488 | btrfs_dev_replace_lock(dev_replace, 0); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 489 | /* was the operation canceled, or is it finished? */ |
| 490 | if (dev_replace->replace_state != |
| 491 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 492 | btrfs_dev_replace_unlock(dev_replace, 0); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 493 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 494 | return 0; |
| 495 | } |
| 496 | |
| 497 | tgt_device = dev_replace->tgtdev; |
| 498 | src_device = dev_replace->srcdev; |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 499 | btrfs_dev_replace_unlock(dev_replace, 0); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 500 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 501 | /* |
| 502 | * flush all outstanding I/O and inode extent mappings before the |
| 503 | * copy operation is declared as being finished |
| 504 | */ |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 505 | ret = btrfs_start_delalloc_roots(fs_info, 0, -1); |
Miao Xie | 3edb2a6 | 2013-01-22 10:49:33 +0000 | [diff] [blame] | 506 | if (ret) { |
| 507 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 508 | return ret; |
| 509 | } |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 510 | btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 511 | |
| 512 | trans = btrfs_start_transaction(root, 0); |
| 513 | if (IS_ERR(trans)) { |
| 514 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 515 | return PTR_ERR(trans); |
| 516 | } |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 517 | ret = btrfs_commit_transaction(trans); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 518 | WARN_ON(ret); |
| 519 | |
Miao Xie | 67a2c45 | 2014-09-03 21:35:43 +0800 | [diff] [blame] | 520 | mutex_lock(&uuid_mutex); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 521 | /* keep away write_all_supers() during the finishing procedure */ |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 522 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
| 523 | mutex_lock(&fs_info->chunk_mutex); |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 524 | btrfs_dev_replace_lock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 525 | dev_replace->replace_state = |
| 526 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED |
| 527 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; |
| 528 | dev_replace->tgtdev = NULL; |
| 529 | dev_replace->srcdev = NULL; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 530 | dev_replace->time_stopped = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 531 | dev_replace->item_needs_writeback = 1; |
| 532 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 533 | /* replace old device with new one in mapping tree */ |
| 534 | if (!scrub_ret) { |
| 535 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
| 536 | src_device, |
| 537 | tgt_device); |
| 538 | } else { |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 539 | btrfs_err_in_rcu(fs_info, |
| 540 | "btrfs_scrub_dev(%s, %llu, %s) failed %d", |
| 541 | src_device->missing ? "<missing disk>" : |
| 542 | rcu_str_deref(src_device->name), |
| 543 | src_device->devid, |
| 544 | rcu_str_deref(tgt_device->name), scrub_ret); |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 545 | btrfs_dev_replace_unlock(dev_replace, 1); |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 546 | mutex_unlock(&fs_info->chunk_mutex); |
| 547 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
Miao Xie | 67a2c45 | 2014-09-03 21:35:43 +0800 | [diff] [blame] | 548 | mutex_unlock(&uuid_mutex); |
Qu Wenruo | ae6529c | 2017-03-29 09:33:21 +0800 | [diff] [blame] | 549 | btrfs_rm_dev_replace_blocked(fs_info); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 550 | if (tgt_device) |
| 551 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
Qu Wenruo | ae6529c | 2017-03-29 09:33:21 +0800 | [diff] [blame] | 552 | btrfs_rm_dev_replace_unblocked(fs_info); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 553 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 554 | |
Eryu Guan | 2fc9f6b | 2014-10-13 12:42:12 +0800 | [diff] [blame] | 555 | return scrub_ret; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 556 | } |
| 557 | |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 558 | btrfs_info_in_rcu(fs_info, |
| 559 | "dev_replace from %s (devid %llu) to %s finished", |
| 560 | src_device->missing ? "<missing disk>" : |
| 561 | rcu_str_deref(src_device->name), |
| 562 | src_device->devid, |
| 563 | rcu_str_deref(tgt_device->name)); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 564 | tgt_device->is_tgtdev_for_dev_replace = 0; |
| 565 | tgt_device->devid = src_device->devid; |
| 566 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 567 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
| 568 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); |
| 569 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 570 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
| 571 | btrfs_device_set_disk_total_bytes(tgt_device, |
| 572 | src_device->disk_total_bytes); |
| 573 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); |
Miao Xie | 935e5cc | 2014-09-03 21:35:33 +0800 | [diff] [blame] | 574 | ASSERT(list_empty(&src_device->resized_list)); |
| 575 | tgt_device->commit_total_bytes = src_device->commit_total_bytes; |
Miao Xie | ce7213c | 2014-09-03 21:35:34 +0800 | [diff] [blame] | 576 | tgt_device->commit_bytes_used = src_device->bytes_used; |
Anand Jain | 88acff6 | 2016-05-03 17:44:43 +0800 | [diff] [blame] | 577 | |
| 578 | btrfs_assign_next_active_device(fs_info, src_device, tgt_device); |
| 579 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 580 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); |
Miao Xie | 82372bc | 2014-09-03 21:35:44 +0800 | [diff] [blame] | 581 | fs_info->fs_devices->rw_devices++; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 582 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 583 | btrfs_dev_replace_unlock(dev_replace, 1); |
Qu Wenruo | 12b894c | 2014-08-20 16:10:15 +0800 | [diff] [blame] | 584 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 585 | btrfs_rm_dev_replace_blocked(fs_info); |
| 586 | |
Qu Wenruo | 084b6e7c | 2014-10-30 16:52:31 +0800 | [diff] [blame] | 587 | btrfs_rm_dev_replace_remove_srcdev(fs_info, src_device); |
Ilya Dryomov | 1357272 | 2013-10-02 20:41:01 +0300 | [diff] [blame] | 588 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 589 | btrfs_rm_dev_replace_unblocked(fs_info); |
| 590 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 591 | /* |
| 592 | * this is again a consistent state where no dev_replace procedure |
| 593 | * is running, the target device is part of the filesystem, the |
| 594 | * source device is not part of the filesystem anymore and its 1st |
| 595 | * superblock is scratched out so that it is no longer marked to |
| 596 | * belong to this filesystem. |
| 597 | */ |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 598 | mutex_unlock(&fs_info->chunk_mutex); |
| 599 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
Miao Xie | 67a2c45 | 2014-09-03 21:35:43 +0800 | [diff] [blame] | 600 | mutex_unlock(&uuid_mutex); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 601 | |
Qu Wenruo | 084b6e7c | 2014-10-30 16:52:31 +0800 | [diff] [blame] | 602 | /* replace the sysfs entry */ |
Anand Jain | 3257604 | 2015-08-14 18:32:49 +0800 | [diff] [blame] | 603 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, src_device); |
Qu Wenruo | 084b6e7c | 2014-10-30 16:52:31 +0800 | [diff] [blame] | 604 | btrfs_rm_dev_replace_free_srcdev(fs_info, src_device); |
| 605 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 606 | /* write back the superblocks */ |
| 607 | trans = btrfs_start_transaction(root, 0); |
| 608 | if (!IS_ERR(trans)) |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 609 | btrfs_commit_transaction(trans); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 610 | |
| 611 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static void btrfs_dev_replace_update_device_in_mapping_tree( |
| 617 | struct btrfs_fs_info *fs_info, |
| 618 | struct btrfs_device *srcdev, |
| 619 | struct btrfs_device *tgtdev) |
| 620 | { |
| 621 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; |
| 622 | struct extent_map *em; |
| 623 | struct map_lookup *map; |
| 624 | u64 start = 0; |
| 625 | int i; |
| 626 | |
| 627 | write_lock(&em_tree->lock); |
| 628 | do { |
| 629 | em = lookup_extent_mapping(em_tree, start, (u64)-1); |
| 630 | if (!em) |
| 631 | break; |
Jeff Mahoney | 95617d6 | 2015-06-03 10:55:48 -0400 | [diff] [blame] | 632 | map = em->map_lookup; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 633 | for (i = 0; i < map->num_stripes; i++) |
| 634 | if (srcdev == map->stripes[i].dev) |
| 635 | map->stripes[i].dev = tgtdev; |
| 636 | start = em->start + em->len; |
| 637 | free_extent_map(em); |
| 638 | } while (start); |
| 639 | write_unlock(&em_tree->lock); |
| 640 | } |
| 641 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 642 | void 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; |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 646 | struct btrfs_device *srcdev; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 647 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 648 | btrfs_dev_replace_lock(dev_replace, 0); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 649 | /* even if !dev_replace_is_valid, the values are good enough for |
| 650 | * the replace_status ioctl */ |
| 651 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| 652 | args->status.replace_state = dev_replace->replace_state; |
| 653 | args->status.time_started = dev_replace->time_started; |
| 654 | args->status.time_stopped = dev_replace->time_stopped; |
| 655 | args->status.num_write_errors = |
| 656 | atomic64_read(&dev_replace->num_write_errors); |
| 657 | args->status.num_uncorrectable_read_errors = |
| 658 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); |
| 659 | switch (dev_replace->replace_state) { |
| 660 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 661 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 662 | args->status.progress_1000 = 0; |
| 663 | break; |
| 664 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 665 | args->status.progress_1000 = 1000; |
| 666 | break; |
| 667 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 668 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 669 | srcdev = dev_replace->srcdev; |
Liu Bo | 42c61ab | 2017-04-03 13:45:24 -0700 | [diff] [blame] | 670 | args->status.progress_1000 = div64_u64(dev_replace->cursor_left, |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 671 | div_u64(btrfs_device_get_total_bytes(srcdev), 1000)); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 672 | break; |
| 673 | } |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 674 | btrfs_dev_replace_unlock(dev_replace, 0); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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 | |
Ilya Dryomov | e649e58 | 2013-10-10 20:40:21 +0300 | [diff] [blame] | 693 | if (fs_info->sb->s_flags & MS_RDONLY) |
| 694 | return -EROFS; |
| 695 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 696 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 697 | btrfs_dev_replace_lock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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; |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 703 | btrfs_dev_replace_unlock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 714 | dev_replace->time_stopped = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 715 | dev_replace->item_needs_writeback = 1; |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 716 | btrfs_dev_replace_unlock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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 | } |
Jeff Mahoney | 3a45bb2 | 2016-09-09 21:39:03 -0400 | [diff] [blame] | 724 | ret = btrfs_commit_transaction(trans); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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); |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 739 | btrfs_dev_replace_lock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 749 | dev_replace->time_stopped = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 750 | dev_replace->item_needs_writeback = 1; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 751 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 752 | break; |
| 753 | } |
| 754 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 755 | btrfs_dev_replace_unlock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 765 | btrfs_dev_replace_lock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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: |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 770 | btrfs_dev_replace_unlock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 780 | btrfs_info(fs_info, |
Jeff Mahoney | 5d163e0 | 2016-09-20 10:05:00 -0400 | [diff] [blame] | 781 | "cannot continue dev_replace, tgtdev is missing"); |
| 782 | btrfs_info(fs_info, |
| 783 | "you may cancel the operation after 'mount -o degraded'"); |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 784 | btrfs_dev_replace_unlock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 785 | return 0; |
| 786 | } |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 787 | btrfs_dev_replace_unlock(dev_replace, 1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 788 | |
David Sterba | 171938e | 2017-03-28 14:44:21 +0200 | [diff] [blame] | 789 | WARN_ON(test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 790 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
Rusty Russell | 8c6ffba | 2013-07-15 11:20:32 +0930 | [diff] [blame] | 791 | return PTR_ERR_OR_ZERO(task); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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 | |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 801 | status_args = kzalloc(sizeof(*status_args), GFP_KERNEL); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 802 | if (status_args) { |
| 803 | btrfs_dev_replace_status(fs_info, status_args); |
| 804 | progress = status_args->status.progress_1000; |
| 805 | kfree(status_args); |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 806 | progress = div_u64(progress, 10); |
David Sterba | ecaeb14 | 2015-10-08 09:01:03 +0200 | [diff] [blame] | 807 | btrfs_info_in_rcu(fs_info, |
| 808 | "continuing dev_replace from %s (devid %llu) to %s @%u%%", |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 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); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 816 | } |
| 817 | btrfs_dev_replace_continue_on_mount(fs_info); |
David Sterba | 171938e | 2017-03-28 14:44:21 +0200 | [diff] [blame] | 818 | clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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, |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 830 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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 |
Adam Buchbinder | bb7ab3b | 2016-03-04 11:23:12 -0800 | [diff] [blame] | 857 | * manually if the cancellation is wanted. |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 858 | */ |
| 859 | break; |
| 860 | } |
| 861 | return 1; |
| 862 | } |
| 863 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 864 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace, int rw) |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 865 | { |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 866 | if (rw == 1) { |
| 867 | /* write */ |
| 868 | again: |
| 869 | wait_event(dev_replace->read_lock_wq, |
| 870 | atomic_read(&dev_replace->blocking_readers) == 0); |
| 871 | write_lock(&dev_replace->lock); |
| 872 | if (atomic_read(&dev_replace->blocking_readers)) { |
| 873 | write_unlock(&dev_replace->lock); |
| 874 | goto again; |
| 875 | } |
| 876 | } else { |
| 877 | read_lock(&dev_replace->lock); |
| 878 | atomic_inc(&dev_replace->read_locks); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 879 | } |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 880 | } |
| 881 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 882 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace, int rw) |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 883 | { |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 884 | if (rw == 1) { |
| 885 | /* write */ |
| 886 | ASSERT(atomic_read(&dev_replace->blocking_readers) == 0); |
| 887 | write_unlock(&dev_replace->lock); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 888 | } else { |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 889 | ASSERT(atomic_read(&dev_replace->read_locks) > 0); |
| 890 | atomic_dec(&dev_replace->read_locks); |
| 891 | read_unlock(&dev_replace->lock); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 892 | } |
| 893 | } |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 894 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 895 | /* inc blocking cnt and release read lock */ |
| 896 | void btrfs_dev_replace_set_lock_blocking( |
| 897 | struct btrfs_dev_replace *dev_replace) |
| 898 | { |
| 899 | /* only set blocking for read lock */ |
| 900 | ASSERT(atomic_read(&dev_replace->read_locks) > 0); |
| 901 | atomic_inc(&dev_replace->blocking_readers); |
| 902 | read_unlock(&dev_replace->lock); |
| 903 | } |
| 904 | |
| 905 | /* acquire read lock and dec blocking cnt */ |
| 906 | void btrfs_dev_replace_clear_lock_blocking( |
| 907 | struct btrfs_dev_replace *dev_replace) |
| 908 | { |
| 909 | /* only set blocking for read lock */ |
| 910 | ASSERT(atomic_read(&dev_replace->read_locks) > 0); |
| 911 | ASSERT(atomic_read(&dev_replace->blocking_readers) > 0); |
| 912 | read_lock(&dev_replace->lock); |
| 913 | if (atomic_dec_and_test(&dev_replace->blocking_readers) && |
| 914 | waitqueue_active(&dev_replace->read_lock_wq)) |
| 915 | wake_up(&dev_replace->read_lock_wq); |
| 916 | } |
| 917 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 918 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) |
| 919 | { |
| 920 | percpu_counter_inc(&fs_info->bio_counter); |
| 921 | } |
| 922 | |
Miao Xie | 4245215 | 2014-11-25 16:39:28 +0800 | [diff] [blame] | 923 | void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount) |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 924 | { |
Miao Xie | 4245215 | 2014-11-25 16:39:28 +0800 | [diff] [blame] | 925 | percpu_counter_sub(&fs_info->bio_counter, amount); |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 926 | |
| 927 | if (waitqueue_active(&fs_info->replace_wait)) |
| 928 | wake_up(&fs_info->replace_wait); |
| 929 | } |
| 930 | |
| 931 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) |
| 932 | { |
Zhao Lei | 09dd7a0 | 2015-01-20 15:11:37 +0800 | [diff] [blame] | 933 | while (1) { |
| 934 | percpu_counter_inc(&fs_info->bio_counter); |
| 935 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
| 936 | &fs_info->fs_state))) |
| 937 | break; |
| 938 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 939 | btrfs_bio_counter_dec(fs_info); |
| 940 | wait_event(fs_info->replace_wait, |
| 941 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
| 942 | &fs_info->fs_state)); |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 943 | } |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 944 | } |