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" |
| 39 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 40 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
| 41 | int scrub_ret); |
| 42 | static void btrfs_dev_replace_update_device_in_mapping_tree( |
| 43 | struct btrfs_fs_info *fs_info, |
| 44 | struct btrfs_device *srcdev, |
| 45 | struct btrfs_device *tgtdev); |
| 46 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, |
| 47 | char *srcdev_name, |
| 48 | struct btrfs_device **device); |
| 49 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); |
| 50 | static int btrfs_dev_replace_kthread(void *data); |
| 51 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); |
| 52 | |
| 53 | |
| 54 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) |
| 55 | { |
| 56 | struct btrfs_key key; |
| 57 | struct btrfs_root *dev_root = fs_info->dev_root; |
| 58 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 59 | struct extent_buffer *eb; |
| 60 | int slot; |
| 61 | int ret = 0; |
| 62 | struct btrfs_path *path = NULL; |
| 63 | int item_size; |
| 64 | struct btrfs_dev_replace_item *ptr; |
| 65 | u64 src_devid; |
| 66 | |
| 67 | path = btrfs_alloc_path(); |
| 68 | if (!path) { |
| 69 | ret = -ENOMEM; |
| 70 | goto out; |
| 71 | } |
| 72 | |
| 73 | key.objectid = 0; |
| 74 | key.type = BTRFS_DEV_REPLACE_KEY; |
| 75 | key.offset = 0; |
| 76 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); |
| 77 | if (ret) { |
| 78 | no_valid_dev_replace_entry_found: |
| 79 | ret = 0; |
| 80 | dev_replace->replace_state = |
| 81 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; |
| 82 | dev_replace->cont_reading_from_srcdev_mode = |
| 83 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; |
| 84 | dev_replace->replace_state = 0; |
| 85 | dev_replace->time_started = 0; |
| 86 | dev_replace->time_stopped = 0; |
| 87 | atomic64_set(&dev_replace->num_write_errors, 0); |
| 88 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); |
| 89 | dev_replace->cursor_left = 0; |
| 90 | dev_replace->committed_cursor_left = 0; |
| 91 | dev_replace->cursor_left_last_write_of_item = 0; |
| 92 | dev_replace->cursor_right = 0; |
| 93 | dev_replace->srcdev = NULL; |
| 94 | dev_replace->tgtdev = NULL; |
| 95 | dev_replace->is_valid = 0; |
| 96 | dev_replace->item_needs_writeback = 0; |
| 97 | goto out; |
| 98 | } |
| 99 | slot = path->slots[0]; |
| 100 | eb = path->nodes[0]; |
| 101 | item_size = btrfs_item_size_nr(eb, slot); |
| 102 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); |
| 103 | |
| 104 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { |
| 105 | pr_warn("btrfs: dev_replace entry found has unexpected size, ignore entry\n"); |
| 106 | goto no_valid_dev_replace_entry_found; |
| 107 | } |
| 108 | |
| 109 | src_devid = btrfs_dev_replace_src_devid(eb, ptr); |
| 110 | dev_replace->cont_reading_from_srcdev_mode = |
| 111 | btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); |
| 112 | dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); |
| 113 | dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); |
| 114 | dev_replace->time_stopped = |
| 115 | btrfs_dev_replace_time_stopped(eb, ptr); |
| 116 | atomic64_set(&dev_replace->num_write_errors, |
| 117 | btrfs_dev_replace_num_write_errors(eb, ptr)); |
| 118 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, |
| 119 | btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); |
| 120 | dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); |
| 121 | dev_replace->committed_cursor_left = dev_replace->cursor_left; |
| 122 | dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; |
| 123 | dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); |
| 124 | dev_replace->is_valid = 1; |
| 125 | |
| 126 | dev_replace->item_needs_writeback = 0; |
| 127 | switch (dev_replace->replace_state) { |
| 128 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 129 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 130 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 131 | dev_replace->srcdev = NULL; |
| 132 | dev_replace->tgtdev = NULL; |
| 133 | break; |
| 134 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 135 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 136 | dev_replace->srcdev = btrfs_find_device(fs_info, src_devid, |
| 137 | NULL, NULL); |
| 138 | dev_replace->tgtdev = btrfs_find_device(fs_info, |
| 139 | BTRFS_DEV_REPLACE_DEVID, |
| 140 | NULL, NULL); |
| 141 | /* |
| 142 | * allow 'btrfs dev replace_cancel' if src/tgt device is |
| 143 | * missing |
| 144 | */ |
| 145 | if (!dev_replace->srcdev && |
| 146 | !btrfs_test_opt(dev_root, DEGRADED)) { |
| 147 | ret = -EIO; |
| 148 | pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 149 | src_devid); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 150 | } |
| 151 | if (!dev_replace->tgtdev && |
| 152 | !btrfs_test_opt(dev_root, DEGRADED)) { |
| 153 | ret = -EIO; |
| 154 | pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "tgtdev (devid %llu) is missing, need to run btrfs dev scan?\n", |
Geert Uytterhoeven | 6e71c47 | 2013-08-20 13:20:08 +0200 | [diff] [blame] | 155 | BTRFS_DEV_REPLACE_DEVID); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 156 | } |
| 157 | if (dev_replace->tgtdev) { |
| 158 | if (dev_replace->srcdev) { |
| 159 | dev_replace->tgtdev->total_bytes = |
| 160 | dev_replace->srcdev->total_bytes; |
| 161 | dev_replace->tgtdev->disk_total_bytes = |
| 162 | dev_replace->srcdev->disk_total_bytes; |
| 163 | dev_replace->tgtdev->bytes_used = |
| 164 | dev_replace->srcdev->bytes_used; |
| 165 | } |
| 166 | dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1; |
| 167 | btrfs_init_dev_replace_tgtdev_for_resume(fs_info, |
| 168 | dev_replace->tgtdev); |
| 169 | } |
| 170 | break; |
| 171 | } |
| 172 | |
| 173 | out: |
| 174 | if (path) |
| 175 | btrfs_free_path(path); |
| 176 | return ret; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * called from commit_transaction. Writes changed device replace state to |
| 181 | * disk. |
| 182 | */ |
| 183 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans, |
| 184 | struct btrfs_fs_info *fs_info) |
| 185 | { |
| 186 | int ret; |
| 187 | struct btrfs_root *dev_root = fs_info->dev_root; |
| 188 | struct btrfs_path *path; |
| 189 | struct btrfs_key key; |
| 190 | struct extent_buffer *eb; |
| 191 | struct btrfs_dev_replace_item *ptr; |
| 192 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 193 | |
| 194 | btrfs_dev_replace_lock(dev_replace); |
| 195 | if (!dev_replace->is_valid || |
| 196 | !dev_replace->item_needs_writeback) { |
| 197 | btrfs_dev_replace_unlock(dev_replace); |
| 198 | return 0; |
| 199 | } |
| 200 | btrfs_dev_replace_unlock(dev_replace); |
| 201 | |
| 202 | key.objectid = 0; |
| 203 | key.type = BTRFS_DEV_REPLACE_KEY; |
| 204 | key.offset = 0; |
| 205 | |
| 206 | path = btrfs_alloc_path(); |
| 207 | if (!path) { |
| 208 | ret = -ENOMEM; |
| 209 | goto out; |
| 210 | } |
| 211 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); |
| 212 | if (ret < 0) { |
| 213 | pr_warn("btrfs: error %d while searching for dev_replace item!\n", |
| 214 | ret); |
| 215 | goto out; |
| 216 | } |
| 217 | |
| 218 | if (ret == 0 && |
| 219 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { |
| 220 | /* |
| 221 | * need to delete old one and insert a new one. |
| 222 | * Since no attempt is made to recover any old state, if the |
| 223 | * dev_replace state is 'running', the data on the target |
| 224 | * drive is lost. |
| 225 | * It would be possible to recover the state: just make sure |
| 226 | * that the beginning of the item is never changed and always |
| 227 | * contains all the essential information. Then read this |
| 228 | * minimal set of information and use it as a base for the |
| 229 | * new state. |
| 230 | */ |
| 231 | ret = btrfs_del_item(trans, dev_root, path); |
| 232 | if (ret != 0) { |
| 233 | pr_warn("btrfs: delete too small dev_replace item failed %d!\n", |
| 234 | ret); |
| 235 | goto out; |
| 236 | } |
| 237 | ret = 1; |
| 238 | } |
| 239 | |
| 240 | if (ret == 1) { |
| 241 | /* need to insert a new item */ |
| 242 | btrfs_release_path(path); |
| 243 | ret = btrfs_insert_empty_item(trans, dev_root, path, |
| 244 | &key, sizeof(*ptr)); |
| 245 | if (ret < 0) { |
| 246 | pr_warn("btrfs: insert dev_replace item failed %d!\n", |
| 247 | ret); |
| 248 | goto out; |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | eb = path->nodes[0]; |
| 253 | ptr = btrfs_item_ptr(eb, path->slots[0], |
| 254 | struct btrfs_dev_replace_item); |
| 255 | |
| 256 | btrfs_dev_replace_lock(dev_replace); |
| 257 | if (dev_replace->srcdev) |
| 258 | btrfs_set_dev_replace_src_devid(eb, ptr, |
| 259 | dev_replace->srcdev->devid); |
| 260 | else |
| 261 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); |
| 262 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, |
| 263 | dev_replace->cont_reading_from_srcdev_mode); |
| 264 | btrfs_set_dev_replace_replace_state(eb, ptr, |
| 265 | dev_replace->replace_state); |
| 266 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); |
| 267 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); |
| 268 | btrfs_set_dev_replace_num_write_errors(eb, ptr, |
| 269 | atomic64_read(&dev_replace->num_write_errors)); |
| 270 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, |
| 271 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); |
| 272 | dev_replace->cursor_left_last_write_of_item = |
| 273 | dev_replace->cursor_left; |
| 274 | btrfs_set_dev_replace_cursor_left(eb, ptr, |
| 275 | dev_replace->cursor_left_last_write_of_item); |
| 276 | btrfs_set_dev_replace_cursor_right(eb, ptr, |
| 277 | dev_replace->cursor_right); |
| 278 | dev_replace->item_needs_writeback = 0; |
| 279 | btrfs_dev_replace_unlock(dev_replace); |
| 280 | |
| 281 | btrfs_mark_buffer_dirty(eb); |
| 282 | |
| 283 | out: |
| 284 | btrfs_free_path(path); |
| 285 | |
| 286 | return ret; |
| 287 | } |
| 288 | |
| 289 | void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) |
| 290 | { |
| 291 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 292 | |
| 293 | dev_replace->committed_cursor_left = |
| 294 | dev_replace->cursor_left_last_write_of_item; |
| 295 | } |
| 296 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 297 | int btrfs_dev_replace_start(struct btrfs_root *root, |
| 298 | struct btrfs_ioctl_dev_replace_args *args) |
| 299 | { |
| 300 | struct btrfs_trans_handle *trans; |
| 301 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 302 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 303 | int ret; |
| 304 | struct btrfs_device *tgt_device = NULL; |
| 305 | struct btrfs_device *src_device = NULL; |
| 306 | |
Stefan Behrens | 4968810 | 2013-05-07 17:28:03 +0000 | [diff] [blame] | 307 | if (btrfs_fs_incompat(fs_info, RAID56)) { |
| 308 | pr_warn("btrfs: dev_replace cannot yet handle RAID5/RAID6\n"); |
| 309 | return -EINVAL; |
| 310 | } |
| 311 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 312 | switch (args->start.cont_reading_from_srcdev_mode) { |
| 313 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: |
| 314 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: |
| 315 | break; |
| 316 | default: |
| 317 | return -EINVAL; |
| 318 | } |
| 319 | |
| 320 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || |
| 321 | args->start.tgtdev_name[0] == '\0') |
| 322 | return -EINVAL; |
| 323 | |
| 324 | mutex_lock(&fs_info->volume_mutex); |
| 325 | ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, |
| 326 | &tgt_device); |
| 327 | if (ret) { |
| 328 | pr_err("btrfs: target device %s is invalid!\n", |
| 329 | args->start.tgtdev_name); |
| 330 | mutex_unlock(&fs_info->volume_mutex); |
| 331 | return -EINVAL; |
| 332 | } |
| 333 | |
| 334 | ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, |
| 335 | args->start.srcdev_name, |
| 336 | &src_device); |
| 337 | mutex_unlock(&fs_info->volume_mutex); |
| 338 | if (ret) { |
| 339 | ret = -EINVAL; |
| 340 | goto leave_no_lock; |
| 341 | } |
| 342 | |
| 343 | if (tgt_device->total_bytes < src_device->total_bytes) { |
| 344 | pr_err("btrfs: target device is smaller than source device!\n"); |
| 345 | ret = -EINVAL; |
| 346 | goto leave_no_lock; |
| 347 | } |
| 348 | |
| 349 | btrfs_dev_replace_lock(dev_replace); |
| 350 | switch (dev_replace->replace_state) { |
| 351 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 352 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 353 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 354 | break; |
| 355 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 356 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 357 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
| 358 | goto leave; |
| 359 | } |
| 360 | |
| 361 | dev_replace->cont_reading_from_srcdev_mode = |
| 362 | args->start.cont_reading_from_srcdev_mode; |
| 363 | WARN_ON(!src_device); |
| 364 | dev_replace->srcdev = src_device; |
| 365 | WARN_ON(!tgt_device); |
| 366 | dev_replace->tgtdev = tgt_device; |
| 367 | |
| 368 | printk_in_rcu(KERN_INFO |
| 369 | "btrfs: dev_replace from %s (devid %llu) to %s) started\n", |
| 370 | src_device->missing ? "<missing disk>" : |
| 371 | rcu_str_deref(src_device->name), |
| 372 | src_device->devid, |
| 373 | rcu_str_deref(tgt_device->name)); |
| 374 | |
| 375 | tgt_device->total_bytes = src_device->total_bytes; |
| 376 | tgt_device->disk_total_bytes = src_device->disk_total_bytes; |
| 377 | tgt_device->bytes_used = src_device->bytes_used; |
| 378 | |
| 379 | /* |
| 380 | * from now on, the writes to the srcdev are all duplicated to |
| 381 | * go to the tgtdev as well (refer to btrfs_map_block()). |
| 382 | */ |
| 383 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 384 | dev_replace->time_started = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 385 | dev_replace->cursor_left = 0; |
| 386 | dev_replace->committed_cursor_left = 0; |
| 387 | dev_replace->cursor_left_last_write_of_item = 0; |
| 388 | dev_replace->cursor_right = 0; |
| 389 | dev_replace->is_valid = 1; |
| 390 | dev_replace->item_needs_writeback = 1; |
| 391 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| 392 | btrfs_dev_replace_unlock(dev_replace); |
| 393 | |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 394 | btrfs_wait_ordered_roots(root->fs_info, -1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 395 | |
| 396 | /* force writing the updated state information to disk */ |
| 397 | trans = btrfs_start_transaction(root, 0); |
| 398 | if (IS_ERR(trans)) { |
| 399 | ret = PTR_ERR(trans); |
| 400 | btrfs_dev_replace_lock(dev_replace); |
| 401 | goto leave; |
| 402 | } |
| 403 | |
| 404 | ret = btrfs_commit_transaction(trans, root); |
| 405 | WARN_ON(ret); |
| 406 | |
| 407 | /* the disk copy procedure reuses the scrub code */ |
| 408 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, |
| 409 | src_device->total_bytes, |
| 410 | &dev_replace->scrub_progress, 0, 1); |
| 411 | |
| 412 | ret = btrfs_dev_replace_finishing(root->fs_info, ret); |
| 413 | WARN_ON(ret); |
| 414 | |
| 415 | return 0; |
| 416 | |
| 417 | leave: |
| 418 | dev_replace->srcdev = NULL; |
| 419 | dev_replace->tgtdev = NULL; |
| 420 | btrfs_dev_replace_unlock(dev_replace); |
| 421 | leave_no_lock: |
| 422 | if (tgt_device) |
| 423 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| 424 | return ret; |
| 425 | } |
| 426 | |
| 427 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
| 428 | int scrub_ret) |
| 429 | { |
| 430 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 431 | struct btrfs_device *tgt_device; |
| 432 | struct btrfs_device *src_device; |
| 433 | struct btrfs_root *root = fs_info->tree_root; |
| 434 | u8 uuid_tmp[BTRFS_UUID_SIZE]; |
| 435 | struct btrfs_trans_handle *trans; |
| 436 | int ret = 0; |
| 437 | |
| 438 | /* don't allow cancel or unmount to disturb the finishing procedure */ |
| 439 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| 440 | |
| 441 | btrfs_dev_replace_lock(dev_replace); |
| 442 | /* was the operation canceled, or is it finished? */ |
| 443 | if (dev_replace->replace_state != |
| 444 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { |
| 445 | btrfs_dev_replace_unlock(dev_replace); |
| 446 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | tgt_device = dev_replace->tgtdev; |
| 451 | src_device = dev_replace->srcdev; |
| 452 | btrfs_dev_replace_unlock(dev_replace); |
| 453 | |
| 454 | /* replace old device with new one in mapping tree */ |
| 455 | if (!scrub_ret) |
| 456 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
| 457 | src_device, |
| 458 | tgt_device); |
| 459 | |
| 460 | /* |
| 461 | * flush all outstanding I/O and inode extent mappings before the |
| 462 | * copy operation is declared as being finished |
| 463 | */ |
Miao Xie | 91aef86 | 2013-11-04 23:13:26 +0800 | [diff] [blame] | 464 | ret = btrfs_start_delalloc_roots(root->fs_info, 0); |
Miao Xie | 3edb2a6 | 2013-01-22 10:49:33 +0000 | [diff] [blame] | 465 | if (ret) { |
| 466 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 467 | return ret; |
| 468 | } |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 469 | btrfs_wait_ordered_roots(root->fs_info, -1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 487 | dev_replace->time_stopped = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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); |
Ilya Dryomov | 1357272 | 2013-10-02 20:41:01 +0300 | [diff] [blame] | 529 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 530 | /* |
| 531 | * this is again a consistent state where no dev_replace procedure |
| 532 | * is running, the target device is part of the filesystem, the |
| 533 | * source device is not part of the filesystem anymore and its 1st |
| 534 | * superblock is scratched out so that it is no longer marked to |
| 535 | * belong to this filesystem. |
| 536 | */ |
| 537 | btrfs_dev_replace_unlock(dev_replace); |
| 538 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 539 | |
| 540 | /* write back the superblocks */ |
| 541 | trans = btrfs_start_transaction(root, 0); |
| 542 | if (!IS_ERR(trans)) |
| 543 | btrfs_commit_transaction(trans, root); |
| 544 | |
| 545 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 546 | |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | static void btrfs_dev_replace_update_device_in_mapping_tree( |
| 551 | struct btrfs_fs_info *fs_info, |
| 552 | struct btrfs_device *srcdev, |
| 553 | struct btrfs_device *tgtdev) |
| 554 | { |
| 555 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; |
| 556 | struct extent_map *em; |
| 557 | struct map_lookup *map; |
| 558 | u64 start = 0; |
| 559 | int i; |
| 560 | |
| 561 | write_lock(&em_tree->lock); |
| 562 | do { |
| 563 | em = lookup_extent_mapping(em_tree, start, (u64)-1); |
| 564 | if (!em) |
| 565 | break; |
| 566 | map = (struct map_lookup *)em->bdev; |
| 567 | for (i = 0; i < map->num_stripes; i++) |
| 568 | if (srcdev == map->stripes[i].dev) |
| 569 | map->stripes[i].dev = tgtdev; |
| 570 | start = em->start + em->len; |
| 571 | free_extent_map(em); |
| 572 | } while (start); |
| 573 | write_unlock(&em_tree->lock); |
| 574 | } |
| 575 | |
| 576 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, |
| 577 | char *srcdev_name, |
| 578 | struct btrfs_device **device) |
| 579 | { |
| 580 | int ret; |
| 581 | |
| 582 | if (srcdevid) { |
| 583 | ret = 0; |
| 584 | *device = btrfs_find_device(root->fs_info, srcdevid, NULL, |
| 585 | NULL); |
| 586 | if (!*device) |
| 587 | ret = -ENOENT; |
| 588 | } else { |
| 589 | ret = btrfs_find_device_missing_or_by_path(root, srcdev_name, |
| 590 | device); |
| 591 | } |
| 592 | return ret; |
| 593 | } |
| 594 | |
| 595 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
| 596 | struct btrfs_ioctl_dev_replace_args *args) |
| 597 | { |
| 598 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 599 | |
| 600 | btrfs_dev_replace_lock(dev_replace); |
| 601 | /* even if !dev_replace_is_valid, the values are good enough for |
| 602 | * the replace_status ioctl */ |
| 603 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| 604 | args->status.replace_state = dev_replace->replace_state; |
| 605 | args->status.time_started = dev_replace->time_started; |
| 606 | args->status.time_stopped = dev_replace->time_stopped; |
| 607 | args->status.num_write_errors = |
| 608 | atomic64_read(&dev_replace->num_write_errors); |
| 609 | args->status.num_uncorrectable_read_errors = |
| 610 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); |
| 611 | switch (dev_replace->replace_state) { |
| 612 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 613 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 614 | args->status.progress_1000 = 0; |
| 615 | break; |
| 616 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 617 | args->status.progress_1000 = 1000; |
| 618 | break; |
| 619 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 620 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 621 | args->status.progress_1000 = div64_u64(dev_replace->cursor_left, |
| 622 | div64_u64(dev_replace->srcdev->total_bytes, 1000)); |
| 623 | break; |
| 624 | } |
| 625 | btrfs_dev_replace_unlock(dev_replace); |
| 626 | } |
| 627 | |
| 628 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, |
| 629 | struct btrfs_ioctl_dev_replace_args *args) |
| 630 | { |
| 631 | args->result = __btrfs_dev_replace_cancel(fs_info); |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
| 636 | { |
| 637 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 638 | struct btrfs_device *tgt_device = NULL; |
| 639 | struct btrfs_trans_handle *trans; |
| 640 | struct btrfs_root *root = fs_info->tree_root; |
| 641 | u64 result; |
| 642 | int ret; |
| 643 | |
Ilya Dryomov | e649e58 | 2013-10-10 20:40:21 +0300 | [diff] [blame] | 644 | if (fs_info->sb->s_flags & MS_RDONLY) |
| 645 | return -EROFS; |
| 646 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 665 | dev_replace->time_stopped = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 666 | dev_replace->item_needs_writeback = 1; |
| 667 | btrfs_dev_replace_unlock(dev_replace); |
| 668 | btrfs_scrub_cancel(fs_info); |
| 669 | |
| 670 | trans = btrfs_start_transaction(root, 0); |
| 671 | if (IS_ERR(trans)) { |
| 672 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 673 | return PTR_ERR(trans); |
| 674 | } |
| 675 | ret = btrfs_commit_transaction(trans, root); |
| 676 | WARN_ON(ret); |
| 677 | if (tgt_device) |
| 678 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| 679 | |
| 680 | leave: |
| 681 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 682 | return result; |
| 683 | } |
| 684 | |
| 685 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) |
| 686 | { |
| 687 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 688 | |
| 689 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| 690 | btrfs_dev_replace_lock(dev_replace); |
| 691 | switch (dev_replace->replace_state) { |
| 692 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 693 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 694 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 695 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 696 | break; |
| 697 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 698 | dev_replace->replace_state = |
| 699 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 700 | dev_replace->time_stopped = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 701 | dev_replace->item_needs_writeback = 1; |
| 702 | pr_info("btrfs: suspending dev_replace for unmount\n"); |
| 703 | break; |
| 704 | } |
| 705 | |
| 706 | btrfs_dev_replace_unlock(dev_replace); |
| 707 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 708 | } |
| 709 | |
| 710 | /* resume dev_replace procedure that was interrupted by unmount */ |
| 711 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) |
| 712 | { |
| 713 | struct task_struct *task; |
| 714 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 715 | |
| 716 | btrfs_dev_replace_lock(dev_replace); |
| 717 | switch (dev_replace->replace_state) { |
| 718 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 719 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 720 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 721 | btrfs_dev_replace_unlock(dev_replace); |
| 722 | return 0; |
| 723 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 724 | break; |
| 725 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 726 | dev_replace->replace_state = |
| 727 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
| 728 | break; |
| 729 | } |
| 730 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { |
| 731 | pr_info("btrfs: cannot continue dev_replace, tgtdev is missing\n" |
| 732 | "btrfs: you may cancel the operation after 'mount -o degraded'\n"); |
| 733 | btrfs_dev_replace_unlock(dev_replace); |
| 734 | return 0; |
| 735 | } |
| 736 | btrfs_dev_replace_unlock(dev_replace); |
| 737 | |
| 738 | WARN_ON(atomic_xchg( |
| 739 | &fs_info->mutually_exclusive_operation_running, 1)); |
| 740 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
Rusty Russell | 8c6ffba | 2013-07-15 11:20:32 +0930 | [diff] [blame] | 741 | return PTR_ERR_OR_ZERO(task); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 742 | } |
| 743 | |
| 744 | static int btrfs_dev_replace_kthread(void *data) |
| 745 | { |
| 746 | struct btrfs_fs_info *fs_info = data; |
| 747 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 748 | struct btrfs_ioctl_dev_replace_args *status_args; |
| 749 | u64 progress; |
| 750 | |
| 751 | status_args = kzalloc(sizeof(*status_args), GFP_NOFS); |
| 752 | if (status_args) { |
| 753 | btrfs_dev_replace_status(fs_info, status_args); |
| 754 | progress = status_args->status.progress_1000; |
| 755 | kfree(status_args); |
| 756 | do_div(progress, 10); |
| 757 | printk_in_rcu(KERN_INFO |
| 758 | "btrfs: continuing dev_replace from %s (devid %llu) to %s @%u%%\n", |
| 759 | dev_replace->srcdev->missing ? "<missing disk>" : |
| 760 | rcu_str_deref(dev_replace->srcdev->name), |
| 761 | dev_replace->srcdev->devid, |
| 762 | dev_replace->tgtdev ? |
| 763 | rcu_str_deref(dev_replace->tgtdev->name) : |
| 764 | "<missing target disk>", |
| 765 | (unsigned int)progress); |
| 766 | } |
| 767 | btrfs_dev_replace_continue_on_mount(fs_info); |
| 768 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); |
| 769 | |
| 770 | return 0; |
| 771 | } |
| 772 | |
| 773 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) |
| 774 | { |
| 775 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 776 | int ret; |
| 777 | |
| 778 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
| 779 | dev_replace->committed_cursor_left, |
| 780 | dev_replace->srcdev->total_bytes, |
| 781 | &dev_replace->scrub_progress, 0, 1); |
| 782 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
| 783 | WARN_ON(ret); |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
| 788 | { |
| 789 | if (!dev_replace->is_valid) |
| 790 | return 0; |
| 791 | |
| 792 | switch (dev_replace->replace_state) { |
| 793 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 794 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 795 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 796 | return 0; |
| 797 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 798 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 799 | /* |
| 800 | * return true even if tgtdev is missing (this is |
| 801 | * something that can happen if the dev_replace |
| 802 | * procedure is suspended by an umount and then |
| 803 | * the tgtdev is missing (or "btrfs dev scan") was |
| 804 | * not called and the the filesystem is remounted |
| 805 | * in degraded state. This does not stop the |
| 806 | * dev_replace procedure. It needs to be canceled |
| 807 | * manually if the cancelation is wanted. |
| 808 | */ |
| 809 | break; |
| 810 | } |
| 811 | return 1; |
| 812 | } |
| 813 | |
| 814 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace) |
| 815 | { |
| 816 | /* the beginning is just an optimization for the typical case */ |
| 817 | if (atomic_read(&dev_replace->nesting_level) == 0) { |
| 818 | acquire_lock: |
| 819 | /* this is not a nested case where the same thread |
| 820 | * is trying to acqurire the same lock twice */ |
| 821 | mutex_lock(&dev_replace->lock); |
| 822 | mutex_lock(&dev_replace->lock_management_lock); |
| 823 | dev_replace->lock_owner = current->pid; |
| 824 | atomic_inc(&dev_replace->nesting_level); |
| 825 | mutex_unlock(&dev_replace->lock_management_lock); |
| 826 | return; |
| 827 | } |
| 828 | |
| 829 | mutex_lock(&dev_replace->lock_management_lock); |
| 830 | if (atomic_read(&dev_replace->nesting_level) > 0 && |
| 831 | dev_replace->lock_owner == current->pid) { |
| 832 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); |
| 833 | atomic_inc(&dev_replace->nesting_level); |
| 834 | mutex_unlock(&dev_replace->lock_management_lock); |
| 835 | return; |
| 836 | } |
| 837 | |
| 838 | mutex_unlock(&dev_replace->lock_management_lock); |
| 839 | goto acquire_lock; |
| 840 | } |
| 841 | |
| 842 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace) |
| 843 | { |
| 844 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); |
| 845 | mutex_lock(&dev_replace->lock_management_lock); |
| 846 | WARN_ON(atomic_read(&dev_replace->nesting_level) < 1); |
| 847 | WARN_ON(dev_replace->lock_owner != current->pid); |
| 848 | atomic_dec(&dev_replace->nesting_level); |
| 849 | if (atomic_read(&dev_replace->nesting_level) == 0) { |
| 850 | dev_replace->lock_owner = 0; |
| 851 | mutex_unlock(&dev_replace->lock_management_lock); |
| 852 | mutex_unlock(&dev_replace->lock); |
| 853 | } else { |
| 854 | mutex_unlock(&dev_replace->lock_management_lock); |
| 855 | } |
| 856 | } |