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> |
| 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 | |
| 41 | static u64 btrfs_get_seconds_since_1970(void); |
| 42 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
| 43 | int scrub_ret); |
| 44 | static 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); |
| 48 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, |
| 49 | char *srcdev_name, |
| 50 | struct btrfs_device **device); |
| 51 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); |
| 52 | static int btrfs_dev_replace_kthread(void *data); |
| 53 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); |
| 54 | |
| 55 | |
| 56 | int 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) { |
| 80 | no_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 | |
| 175 | out: |
| 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 | */ |
| 185 | int 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 | |
| 285 | out: |
| 286 | btrfs_free_path(path); |
| 287 | |
| 288 | return ret; |
| 289 | } |
| 290 | |
| 291 | void 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 | |
| 299 | static u64 btrfs_get_seconds_since_1970(void) |
| 300 | { |
| 301 | struct timespec t = CURRENT_TIME_SEC; |
| 302 | |
| 303 | return t.tv_sec; |
| 304 | } |
| 305 | |
| 306 | int 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 | |
Stefan Behrens | 4968810 | 2013-05-07 17:28:03 +0000 | [diff] [blame] | 316 | if (btrfs_fs_incompat(fs_info, RAID56)) { |
| 317 | pr_warn("btrfs: dev_replace cannot yet handle RAID5/RAID6\n"); |
| 318 | return -EINVAL; |
| 319 | } |
| 320 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 321 | switch (args->start.cont_reading_from_srcdev_mode) { |
| 322 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: |
| 323 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: |
| 324 | break; |
| 325 | default: |
| 326 | return -EINVAL; |
| 327 | } |
| 328 | |
| 329 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || |
| 330 | args->start.tgtdev_name[0] == '\0') |
| 331 | return -EINVAL; |
| 332 | |
| 333 | mutex_lock(&fs_info->volume_mutex); |
| 334 | ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, |
| 335 | &tgt_device); |
| 336 | if (ret) { |
| 337 | pr_err("btrfs: target device %s is invalid!\n", |
| 338 | args->start.tgtdev_name); |
| 339 | mutex_unlock(&fs_info->volume_mutex); |
| 340 | return -EINVAL; |
| 341 | } |
| 342 | |
| 343 | ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, |
| 344 | args->start.srcdev_name, |
| 345 | &src_device); |
| 346 | mutex_unlock(&fs_info->volume_mutex); |
| 347 | if (ret) { |
| 348 | ret = -EINVAL; |
| 349 | goto leave_no_lock; |
| 350 | } |
| 351 | |
| 352 | if (tgt_device->total_bytes < src_device->total_bytes) { |
| 353 | pr_err("btrfs: target device is smaller than source device!\n"); |
| 354 | ret = -EINVAL; |
| 355 | goto leave_no_lock; |
| 356 | } |
| 357 | |
| 358 | btrfs_dev_replace_lock(dev_replace); |
| 359 | switch (dev_replace->replace_state) { |
| 360 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 361 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 362 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 363 | break; |
| 364 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 365 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 366 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
| 367 | goto leave; |
| 368 | } |
| 369 | |
| 370 | dev_replace->cont_reading_from_srcdev_mode = |
| 371 | args->start.cont_reading_from_srcdev_mode; |
| 372 | WARN_ON(!src_device); |
| 373 | dev_replace->srcdev = src_device; |
| 374 | WARN_ON(!tgt_device); |
| 375 | dev_replace->tgtdev = tgt_device; |
| 376 | |
| 377 | printk_in_rcu(KERN_INFO |
| 378 | "btrfs: dev_replace from %s (devid %llu) to %s) started\n", |
| 379 | src_device->missing ? "<missing disk>" : |
| 380 | rcu_str_deref(src_device->name), |
| 381 | src_device->devid, |
| 382 | rcu_str_deref(tgt_device->name)); |
| 383 | |
| 384 | tgt_device->total_bytes = src_device->total_bytes; |
| 385 | tgt_device->disk_total_bytes = src_device->disk_total_bytes; |
| 386 | tgt_device->bytes_used = src_device->bytes_used; |
| 387 | |
| 388 | /* |
| 389 | * from now on, the writes to the srcdev are all duplicated to |
| 390 | * go to the tgtdev as well (refer to btrfs_map_block()). |
| 391 | */ |
| 392 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
| 393 | dev_replace->time_started = btrfs_get_seconds_since_1970(); |
| 394 | dev_replace->cursor_left = 0; |
| 395 | dev_replace->committed_cursor_left = 0; |
| 396 | dev_replace->cursor_left_last_write_of_item = 0; |
| 397 | dev_replace->cursor_right = 0; |
| 398 | dev_replace->is_valid = 1; |
| 399 | dev_replace->item_needs_writeback = 1; |
| 400 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| 401 | btrfs_dev_replace_unlock(dev_replace); |
| 402 | |
| 403 | btrfs_wait_ordered_extents(root, 0); |
| 404 | |
| 405 | /* force writing the updated state information to disk */ |
| 406 | trans = btrfs_start_transaction(root, 0); |
| 407 | if (IS_ERR(trans)) { |
| 408 | ret = PTR_ERR(trans); |
| 409 | btrfs_dev_replace_lock(dev_replace); |
| 410 | goto leave; |
| 411 | } |
| 412 | |
| 413 | ret = btrfs_commit_transaction(trans, root); |
| 414 | WARN_ON(ret); |
| 415 | |
| 416 | /* the disk copy procedure reuses the scrub code */ |
| 417 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, |
| 418 | src_device->total_bytes, |
| 419 | &dev_replace->scrub_progress, 0, 1); |
| 420 | |
| 421 | ret = btrfs_dev_replace_finishing(root->fs_info, ret); |
| 422 | WARN_ON(ret); |
| 423 | |
| 424 | return 0; |
| 425 | |
| 426 | leave: |
| 427 | dev_replace->srcdev = NULL; |
| 428 | dev_replace->tgtdev = NULL; |
| 429 | btrfs_dev_replace_unlock(dev_replace); |
| 430 | leave_no_lock: |
| 431 | if (tgt_device) |
| 432 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| 433 | return ret; |
| 434 | } |
| 435 | |
| 436 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
| 437 | int scrub_ret) |
| 438 | { |
| 439 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 440 | struct btrfs_device *tgt_device; |
| 441 | struct btrfs_device *src_device; |
| 442 | struct btrfs_root *root = fs_info->tree_root; |
| 443 | u8 uuid_tmp[BTRFS_UUID_SIZE]; |
| 444 | struct btrfs_trans_handle *trans; |
| 445 | int ret = 0; |
| 446 | |
| 447 | /* don't allow cancel or unmount to disturb the finishing procedure */ |
| 448 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| 449 | |
| 450 | btrfs_dev_replace_lock(dev_replace); |
| 451 | /* was the operation canceled, or is it finished? */ |
| 452 | if (dev_replace->replace_state != |
| 453 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { |
| 454 | btrfs_dev_replace_unlock(dev_replace); |
| 455 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | tgt_device = dev_replace->tgtdev; |
| 460 | src_device = dev_replace->srcdev; |
| 461 | btrfs_dev_replace_unlock(dev_replace); |
| 462 | |
| 463 | /* replace old device with new one in mapping tree */ |
| 464 | if (!scrub_ret) |
| 465 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
| 466 | src_device, |
| 467 | tgt_device); |
| 468 | |
| 469 | /* |
| 470 | * flush all outstanding I/O and inode extent mappings before the |
| 471 | * copy operation is declared as being finished |
| 472 | */ |
Miao Xie | eb73c1b | 2013-05-15 07:48:22 +0000 | [diff] [blame^] | 473 | ret = btrfs_start_all_delalloc_inodes(root->fs_info, 0); |
Miao Xie | 3edb2a6 | 2013-01-22 10:49:33 +0000 | [diff] [blame] | 474 | if (ret) { |
| 475 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 476 | return ret; |
| 477 | } |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 478 | btrfs_wait_ordered_extents(root, 0); |
| 479 | |
| 480 | trans = btrfs_start_transaction(root, 0); |
| 481 | if (IS_ERR(trans)) { |
| 482 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 483 | return PTR_ERR(trans); |
| 484 | } |
| 485 | ret = btrfs_commit_transaction(trans, root); |
| 486 | WARN_ON(ret); |
| 487 | |
| 488 | /* keep away write_all_supers() during the finishing procedure */ |
| 489 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
| 490 | btrfs_dev_replace_lock(dev_replace); |
| 491 | dev_replace->replace_state = |
| 492 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED |
| 493 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; |
| 494 | dev_replace->tgtdev = NULL; |
| 495 | dev_replace->srcdev = NULL; |
| 496 | dev_replace->time_stopped = btrfs_get_seconds_since_1970(); |
| 497 | dev_replace->item_needs_writeback = 1; |
| 498 | |
| 499 | if (scrub_ret) { |
| 500 | printk_in_rcu(KERN_ERR |
| 501 | "btrfs: btrfs_scrub_dev(%s, %llu, %s) failed %d\n", |
| 502 | src_device->missing ? "<missing disk>" : |
| 503 | rcu_str_deref(src_device->name), |
| 504 | src_device->devid, |
| 505 | rcu_str_deref(tgt_device->name), scrub_ret); |
| 506 | btrfs_dev_replace_unlock(dev_replace); |
| 507 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 508 | if (tgt_device) |
| 509 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| 510 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 511 | |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | printk_in_rcu(KERN_INFO |
| 516 | "btrfs: dev_replace from %s (devid %llu) to %s) finished\n", |
| 517 | src_device->missing ? "<missing disk>" : |
| 518 | rcu_str_deref(src_device->name), |
| 519 | src_device->devid, |
| 520 | rcu_str_deref(tgt_device->name)); |
| 521 | tgt_device->is_tgtdev_for_dev_replace = 0; |
| 522 | tgt_device->devid = src_device->devid; |
| 523 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; |
| 524 | tgt_device->bytes_used = src_device->bytes_used; |
| 525 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
| 526 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); |
| 527 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); |
| 528 | tgt_device->total_bytes = src_device->total_bytes; |
| 529 | tgt_device->disk_total_bytes = src_device->disk_total_bytes; |
| 530 | tgt_device->bytes_used = src_device->bytes_used; |
| 531 | if (fs_info->sb->s_bdev == src_device->bdev) |
| 532 | fs_info->sb->s_bdev = tgt_device->bdev; |
| 533 | if (fs_info->fs_devices->latest_bdev == src_device->bdev) |
| 534 | fs_info->fs_devices->latest_bdev = tgt_device->bdev; |
| 535 | list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); |
| 536 | |
| 537 | btrfs_rm_dev_replace_srcdev(fs_info, src_device); |
| 538 | if (src_device->bdev) { |
| 539 | /* zero out the old super */ |
| 540 | btrfs_scratch_superblock(src_device); |
| 541 | } |
| 542 | /* |
| 543 | * this is again a consistent state where no dev_replace procedure |
| 544 | * is running, the target device is part of the filesystem, the |
| 545 | * source device is not part of the filesystem anymore and its 1st |
| 546 | * superblock is scratched out so that it is no longer marked to |
| 547 | * belong to this filesystem. |
| 548 | */ |
| 549 | btrfs_dev_replace_unlock(dev_replace); |
| 550 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 551 | |
| 552 | /* write back the superblocks */ |
| 553 | trans = btrfs_start_transaction(root, 0); |
| 554 | if (!IS_ERR(trans)) |
| 555 | btrfs_commit_transaction(trans, root); |
| 556 | |
| 557 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 558 | |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | static void btrfs_dev_replace_update_device_in_mapping_tree( |
| 563 | struct btrfs_fs_info *fs_info, |
| 564 | struct btrfs_device *srcdev, |
| 565 | struct btrfs_device *tgtdev) |
| 566 | { |
| 567 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; |
| 568 | struct extent_map *em; |
| 569 | struct map_lookup *map; |
| 570 | u64 start = 0; |
| 571 | int i; |
| 572 | |
| 573 | write_lock(&em_tree->lock); |
| 574 | do { |
| 575 | em = lookup_extent_mapping(em_tree, start, (u64)-1); |
| 576 | if (!em) |
| 577 | break; |
| 578 | map = (struct map_lookup *)em->bdev; |
| 579 | for (i = 0; i < map->num_stripes; i++) |
| 580 | if (srcdev == map->stripes[i].dev) |
| 581 | map->stripes[i].dev = tgtdev; |
| 582 | start = em->start + em->len; |
| 583 | free_extent_map(em); |
| 584 | } while (start); |
| 585 | write_unlock(&em_tree->lock); |
| 586 | } |
| 587 | |
| 588 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, |
| 589 | char *srcdev_name, |
| 590 | struct btrfs_device **device) |
| 591 | { |
| 592 | int ret; |
| 593 | |
| 594 | if (srcdevid) { |
| 595 | ret = 0; |
| 596 | *device = btrfs_find_device(root->fs_info, srcdevid, NULL, |
| 597 | NULL); |
| 598 | if (!*device) |
| 599 | ret = -ENOENT; |
| 600 | } else { |
| 601 | ret = btrfs_find_device_missing_or_by_path(root, srcdev_name, |
| 602 | device); |
| 603 | } |
| 604 | return ret; |
| 605 | } |
| 606 | |
| 607 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
| 608 | struct btrfs_ioctl_dev_replace_args *args) |
| 609 | { |
| 610 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 611 | |
| 612 | btrfs_dev_replace_lock(dev_replace); |
| 613 | /* even if !dev_replace_is_valid, the values are good enough for |
| 614 | * the replace_status ioctl */ |
| 615 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| 616 | args->status.replace_state = dev_replace->replace_state; |
| 617 | args->status.time_started = dev_replace->time_started; |
| 618 | args->status.time_stopped = dev_replace->time_stopped; |
| 619 | args->status.num_write_errors = |
| 620 | atomic64_read(&dev_replace->num_write_errors); |
| 621 | args->status.num_uncorrectable_read_errors = |
| 622 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); |
| 623 | switch (dev_replace->replace_state) { |
| 624 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 625 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 626 | args->status.progress_1000 = 0; |
| 627 | break; |
| 628 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 629 | args->status.progress_1000 = 1000; |
| 630 | break; |
| 631 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 632 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 633 | args->status.progress_1000 = div64_u64(dev_replace->cursor_left, |
| 634 | div64_u64(dev_replace->srcdev->total_bytes, 1000)); |
| 635 | break; |
| 636 | } |
| 637 | btrfs_dev_replace_unlock(dev_replace); |
| 638 | } |
| 639 | |
| 640 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, |
| 641 | struct btrfs_ioctl_dev_replace_args *args) |
| 642 | { |
| 643 | args->result = __btrfs_dev_replace_cancel(fs_info); |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
| 648 | { |
| 649 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 650 | struct btrfs_device *tgt_device = NULL; |
| 651 | struct btrfs_trans_handle *trans; |
| 652 | struct btrfs_root *root = fs_info->tree_root; |
| 653 | u64 result; |
| 654 | int ret; |
| 655 | |
| 656 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| 657 | btrfs_dev_replace_lock(dev_replace); |
| 658 | switch (dev_replace->replace_state) { |
| 659 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 660 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 661 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 662 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; |
| 663 | btrfs_dev_replace_unlock(dev_replace); |
| 664 | goto leave; |
| 665 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 666 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 667 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| 668 | tgt_device = dev_replace->tgtdev; |
| 669 | dev_replace->tgtdev = NULL; |
| 670 | dev_replace->srcdev = NULL; |
| 671 | break; |
| 672 | } |
| 673 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; |
| 674 | dev_replace->time_stopped = btrfs_get_seconds_since_1970(); |
| 675 | dev_replace->item_needs_writeback = 1; |
| 676 | btrfs_dev_replace_unlock(dev_replace); |
| 677 | btrfs_scrub_cancel(fs_info); |
| 678 | |
| 679 | trans = btrfs_start_transaction(root, 0); |
| 680 | if (IS_ERR(trans)) { |
| 681 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 682 | return PTR_ERR(trans); |
| 683 | } |
| 684 | ret = btrfs_commit_transaction(trans, root); |
| 685 | WARN_ON(ret); |
| 686 | if (tgt_device) |
| 687 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| 688 | |
| 689 | leave: |
| 690 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 691 | return result; |
| 692 | } |
| 693 | |
| 694 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) |
| 695 | { |
| 696 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 697 | |
| 698 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| 699 | btrfs_dev_replace_lock(dev_replace); |
| 700 | switch (dev_replace->replace_state) { |
| 701 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 702 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 703 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 704 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 705 | break; |
| 706 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 707 | dev_replace->replace_state = |
| 708 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; |
| 709 | dev_replace->time_stopped = btrfs_get_seconds_since_1970(); |
| 710 | dev_replace->item_needs_writeback = 1; |
| 711 | pr_info("btrfs: suspending dev_replace for unmount\n"); |
| 712 | break; |
| 713 | } |
| 714 | |
| 715 | btrfs_dev_replace_unlock(dev_replace); |
| 716 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 717 | } |
| 718 | |
| 719 | /* resume dev_replace procedure that was interrupted by unmount */ |
| 720 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) |
| 721 | { |
| 722 | struct task_struct *task; |
| 723 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 724 | |
| 725 | btrfs_dev_replace_lock(dev_replace); |
| 726 | switch (dev_replace->replace_state) { |
| 727 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 728 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 729 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 730 | btrfs_dev_replace_unlock(dev_replace); |
| 731 | return 0; |
| 732 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 733 | break; |
| 734 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 735 | dev_replace->replace_state = |
| 736 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
| 737 | break; |
| 738 | } |
| 739 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { |
| 740 | pr_info("btrfs: cannot continue dev_replace, tgtdev is missing\n" |
| 741 | "btrfs: you may cancel the operation after 'mount -o degraded'\n"); |
| 742 | btrfs_dev_replace_unlock(dev_replace); |
| 743 | return 0; |
| 744 | } |
| 745 | btrfs_dev_replace_unlock(dev_replace); |
| 746 | |
| 747 | WARN_ON(atomic_xchg( |
| 748 | &fs_info->mutually_exclusive_operation_running, 1)); |
| 749 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
| 750 | return PTR_RET(task); |
| 751 | } |
| 752 | |
| 753 | static int btrfs_dev_replace_kthread(void *data) |
| 754 | { |
| 755 | struct btrfs_fs_info *fs_info = data; |
| 756 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 757 | struct btrfs_ioctl_dev_replace_args *status_args; |
| 758 | u64 progress; |
| 759 | |
| 760 | status_args = kzalloc(sizeof(*status_args), GFP_NOFS); |
| 761 | if (status_args) { |
| 762 | btrfs_dev_replace_status(fs_info, status_args); |
| 763 | progress = status_args->status.progress_1000; |
| 764 | kfree(status_args); |
| 765 | do_div(progress, 10); |
| 766 | printk_in_rcu(KERN_INFO |
| 767 | "btrfs: continuing dev_replace from %s (devid %llu) to %s @%u%%\n", |
| 768 | dev_replace->srcdev->missing ? "<missing disk>" : |
| 769 | rcu_str_deref(dev_replace->srcdev->name), |
| 770 | dev_replace->srcdev->devid, |
| 771 | dev_replace->tgtdev ? |
| 772 | rcu_str_deref(dev_replace->tgtdev->name) : |
| 773 | "<missing target disk>", |
| 774 | (unsigned int)progress); |
| 775 | } |
| 776 | btrfs_dev_replace_continue_on_mount(fs_info); |
| 777 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); |
| 778 | |
| 779 | return 0; |
| 780 | } |
| 781 | |
| 782 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) |
| 783 | { |
| 784 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 785 | int ret; |
| 786 | |
| 787 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
| 788 | dev_replace->committed_cursor_left, |
| 789 | dev_replace->srcdev->total_bytes, |
| 790 | &dev_replace->scrub_progress, 0, 1); |
| 791 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
| 792 | WARN_ON(ret); |
| 793 | return 0; |
| 794 | } |
| 795 | |
| 796 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
| 797 | { |
| 798 | if (!dev_replace->is_valid) |
| 799 | return 0; |
| 800 | |
| 801 | switch (dev_replace->replace_state) { |
| 802 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 803 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 804 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 805 | return 0; |
| 806 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 807 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 808 | /* |
| 809 | * return true even if tgtdev is missing (this is |
| 810 | * something that can happen if the dev_replace |
| 811 | * procedure is suspended by an umount and then |
| 812 | * the tgtdev is missing (or "btrfs dev scan") was |
| 813 | * not called and the the filesystem is remounted |
| 814 | * in degraded state. This does not stop the |
| 815 | * dev_replace procedure. It needs to be canceled |
| 816 | * manually if the cancelation is wanted. |
| 817 | */ |
| 818 | break; |
| 819 | } |
| 820 | return 1; |
| 821 | } |
| 822 | |
| 823 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace) |
| 824 | { |
| 825 | /* the beginning is just an optimization for the typical case */ |
| 826 | if (atomic_read(&dev_replace->nesting_level) == 0) { |
| 827 | acquire_lock: |
| 828 | /* this is not a nested case where the same thread |
| 829 | * is trying to acqurire the same lock twice */ |
| 830 | mutex_lock(&dev_replace->lock); |
| 831 | mutex_lock(&dev_replace->lock_management_lock); |
| 832 | dev_replace->lock_owner = current->pid; |
| 833 | atomic_inc(&dev_replace->nesting_level); |
| 834 | mutex_unlock(&dev_replace->lock_management_lock); |
| 835 | return; |
| 836 | } |
| 837 | |
| 838 | mutex_lock(&dev_replace->lock_management_lock); |
| 839 | if (atomic_read(&dev_replace->nesting_level) > 0 && |
| 840 | dev_replace->lock_owner == current->pid) { |
| 841 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); |
| 842 | atomic_inc(&dev_replace->nesting_level); |
| 843 | mutex_unlock(&dev_replace->lock_management_lock); |
| 844 | return; |
| 845 | } |
| 846 | |
| 847 | mutex_unlock(&dev_replace->lock_management_lock); |
| 848 | goto acquire_lock; |
| 849 | } |
| 850 | |
| 851 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace) |
| 852 | { |
| 853 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); |
| 854 | mutex_lock(&dev_replace->lock_management_lock); |
| 855 | WARN_ON(atomic_read(&dev_replace->nesting_level) < 1); |
| 856 | WARN_ON(dev_replace->lock_owner != current->pid); |
| 857 | atomic_dec(&dev_replace->nesting_level); |
| 858 | if (atomic_read(&dev_replace->nesting_level) == 0) { |
| 859 | dev_replace->lock_owner = 0; |
| 860 | mutex_unlock(&dev_replace->lock_management_lock); |
| 861 | mutex_unlock(&dev_replace->lock); |
| 862 | } else { |
| 863 | mutex_unlock(&dev_replace->lock_management_lock); |
| 864 | } |
| 865 | } |