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); |
| 47 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, |
| 48 | char *srcdev_name, |
| 49 | struct btrfs_device **device); |
| 50 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info); |
| 51 | static int btrfs_dev_replace_kthread(void *data); |
| 52 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info); |
| 53 | |
| 54 | |
| 55 | int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) |
| 56 | { |
| 57 | struct btrfs_key key; |
| 58 | struct btrfs_root *dev_root = fs_info->dev_root; |
| 59 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 60 | struct extent_buffer *eb; |
| 61 | int slot; |
| 62 | int ret = 0; |
| 63 | struct btrfs_path *path = NULL; |
| 64 | int item_size; |
| 65 | struct btrfs_dev_replace_item *ptr; |
| 66 | u64 src_devid; |
| 67 | |
| 68 | path = btrfs_alloc_path(); |
| 69 | if (!path) { |
| 70 | ret = -ENOMEM; |
| 71 | goto out; |
| 72 | } |
| 73 | |
| 74 | key.objectid = 0; |
| 75 | key.type = BTRFS_DEV_REPLACE_KEY; |
| 76 | key.offset = 0; |
| 77 | ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); |
| 78 | if (ret) { |
| 79 | no_valid_dev_replace_entry_found: |
| 80 | ret = 0; |
| 81 | dev_replace->replace_state = |
| 82 | BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; |
| 83 | dev_replace->cont_reading_from_srcdev_mode = |
| 84 | BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; |
| 85 | dev_replace->replace_state = 0; |
| 86 | dev_replace->time_started = 0; |
| 87 | dev_replace->time_stopped = 0; |
| 88 | atomic64_set(&dev_replace->num_write_errors, 0); |
| 89 | atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); |
| 90 | dev_replace->cursor_left = 0; |
| 91 | dev_replace->committed_cursor_left = 0; |
| 92 | dev_replace->cursor_left_last_write_of_item = 0; |
| 93 | dev_replace->cursor_right = 0; |
| 94 | dev_replace->srcdev = NULL; |
| 95 | dev_replace->tgtdev = NULL; |
| 96 | dev_replace->is_valid = 0; |
| 97 | dev_replace->item_needs_writeback = 0; |
| 98 | goto out; |
| 99 | } |
| 100 | slot = path->slots[0]; |
| 101 | eb = path->nodes[0]; |
| 102 | item_size = btrfs_item_size_nr(eb, slot); |
| 103 | ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); |
| 104 | |
| 105 | if (item_size != sizeof(struct btrfs_dev_replace_item)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 106 | btrfs_warn(fs_info, |
| 107 | "dev_replace entry found has unexpected size, ignore entry"); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 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; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 150 | btrfs_warn(fs_info, |
| 151 | "cannot mount because device replace operation is ongoing and"); |
| 152 | btrfs_warn(fs_info, |
| 153 | "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?", |
| 154 | src_devid); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 155 | } |
| 156 | if (!dev_replace->tgtdev && |
| 157 | !btrfs_test_opt(dev_root, DEGRADED)) { |
| 158 | ret = -EIO; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 159 | btrfs_warn(fs_info, |
| 160 | "cannot mount because device replace operation is ongoing and"); |
| 161 | btrfs_warn(fs_info, |
| 162 | "tgtdev (devid %llu) is missing, need to run 'btrfs dev scan'?", |
Geert Uytterhoeven | 6e71c47 | 2013-08-20 13:20:08 +0200 | [diff] [blame] | 163 | BTRFS_DEV_REPLACE_DEVID); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 164 | } |
| 165 | if (dev_replace->tgtdev) { |
| 166 | if (dev_replace->srcdev) { |
| 167 | dev_replace->tgtdev->total_bytes = |
| 168 | dev_replace->srcdev->total_bytes; |
| 169 | dev_replace->tgtdev->disk_total_bytes = |
| 170 | dev_replace->srcdev->disk_total_bytes; |
Miao Xie | 935e5cc | 2014-09-03 21:35:33 +0800 | [diff] [blame] | 171 | dev_replace->tgtdev->commit_total_bytes = |
| 172 | dev_replace->srcdev->commit_total_bytes; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 173 | dev_replace->tgtdev->bytes_used = |
| 174 | dev_replace->srcdev->bytes_used; |
Miao Xie | ce7213c | 2014-09-03 21:35:34 +0800 | [diff] [blame] | 175 | dev_replace->tgtdev->commit_bytes_used = |
| 176 | dev_replace->srcdev->commit_bytes_used; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 177 | } |
| 178 | dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1; |
| 179 | btrfs_init_dev_replace_tgtdev_for_resume(fs_info, |
| 180 | dev_replace->tgtdev); |
| 181 | } |
| 182 | break; |
| 183 | } |
| 184 | |
| 185 | out: |
| 186 | if (path) |
| 187 | btrfs_free_path(path); |
| 188 | return ret; |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * called from commit_transaction. Writes changed device replace state to |
| 193 | * disk. |
| 194 | */ |
| 195 | int btrfs_run_dev_replace(struct btrfs_trans_handle *trans, |
| 196 | struct btrfs_fs_info *fs_info) |
| 197 | { |
| 198 | int ret; |
| 199 | struct btrfs_root *dev_root = fs_info->dev_root; |
| 200 | struct btrfs_path *path; |
| 201 | struct btrfs_key key; |
| 202 | struct extent_buffer *eb; |
| 203 | struct btrfs_dev_replace_item *ptr; |
| 204 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 205 | |
| 206 | btrfs_dev_replace_lock(dev_replace); |
| 207 | if (!dev_replace->is_valid || |
| 208 | !dev_replace->item_needs_writeback) { |
| 209 | btrfs_dev_replace_unlock(dev_replace); |
| 210 | return 0; |
| 211 | } |
| 212 | btrfs_dev_replace_unlock(dev_replace); |
| 213 | |
| 214 | key.objectid = 0; |
| 215 | key.type = BTRFS_DEV_REPLACE_KEY; |
| 216 | key.offset = 0; |
| 217 | |
| 218 | path = btrfs_alloc_path(); |
| 219 | if (!path) { |
| 220 | ret = -ENOMEM; |
| 221 | goto out; |
| 222 | } |
| 223 | ret = btrfs_search_slot(trans, dev_root, &key, path, -1, 1); |
| 224 | if (ret < 0) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 225 | btrfs_warn(fs_info, "error %d while searching for dev_replace item!", |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 226 | ret); |
| 227 | goto out; |
| 228 | } |
| 229 | |
| 230 | if (ret == 0 && |
| 231 | btrfs_item_size_nr(path->nodes[0], path->slots[0]) < sizeof(*ptr)) { |
| 232 | /* |
| 233 | * need to delete old one and insert a new one. |
| 234 | * Since no attempt is made to recover any old state, if the |
| 235 | * dev_replace state is 'running', the data on the target |
| 236 | * drive is lost. |
| 237 | * It would be possible to recover the state: just make sure |
| 238 | * that the beginning of the item is never changed and always |
| 239 | * contains all the essential information. Then read this |
| 240 | * minimal set of information and use it as a base for the |
| 241 | * new state. |
| 242 | */ |
| 243 | ret = btrfs_del_item(trans, dev_root, path); |
| 244 | if (ret != 0) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 245 | btrfs_warn(fs_info, "delete too small dev_replace item failed %d!", |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 246 | ret); |
| 247 | goto out; |
| 248 | } |
| 249 | ret = 1; |
| 250 | } |
| 251 | |
| 252 | if (ret == 1) { |
| 253 | /* need to insert a new item */ |
| 254 | btrfs_release_path(path); |
| 255 | ret = btrfs_insert_empty_item(trans, dev_root, path, |
| 256 | &key, sizeof(*ptr)); |
| 257 | if (ret < 0) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 258 | btrfs_warn(fs_info, "insert dev_replace item failed %d!", |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 259 | ret); |
| 260 | goto out; |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | eb = path->nodes[0]; |
| 265 | ptr = btrfs_item_ptr(eb, path->slots[0], |
| 266 | struct btrfs_dev_replace_item); |
| 267 | |
| 268 | btrfs_dev_replace_lock(dev_replace); |
| 269 | if (dev_replace->srcdev) |
| 270 | btrfs_set_dev_replace_src_devid(eb, ptr, |
| 271 | dev_replace->srcdev->devid); |
| 272 | else |
| 273 | btrfs_set_dev_replace_src_devid(eb, ptr, (u64)-1); |
| 274 | btrfs_set_dev_replace_cont_reading_from_srcdev_mode(eb, ptr, |
| 275 | dev_replace->cont_reading_from_srcdev_mode); |
| 276 | btrfs_set_dev_replace_replace_state(eb, ptr, |
| 277 | dev_replace->replace_state); |
| 278 | btrfs_set_dev_replace_time_started(eb, ptr, dev_replace->time_started); |
| 279 | btrfs_set_dev_replace_time_stopped(eb, ptr, dev_replace->time_stopped); |
| 280 | btrfs_set_dev_replace_num_write_errors(eb, ptr, |
| 281 | atomic64_read(&dev_replace->num_write_errors)); |
| 282 | btrfs_set_dev_replace_num_uncorrectable_read_errors(eb, ptr, |
| 283 | atomic64_read(&dev_replace->num_uncorrectable_read_errors)); |
| 284 | dev_replace->cursor_left_last_write_of_item = |
| 285 | dev_replace->cursor_left; |
| 286 | btrfs_set_dev_replace_cursor_left(eb, ptr, |
| 287 | dev_replace->cursor_left_last_write_of_item); |
| 288 | btrfs_set_dev_replace_cursor_right(eb, ptr, |
| 289 | dev_replace->cursor_right); |
| 290 | dev_replace->item_needs_writeback = 0; |
| 291 | btrfs_dev_replace_unlock(dev_replace); |
| 292 | |
| 293 | btrfs_mark_buffer_dirty(eb); |
| 294 | |
| 295 | out: |
| 296 | btrfs_free_path(path); |
| 297 | |
| 298 | return ret; |
| 299 | } |
| 300 | |
| 301 | void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info) |
| 302 | { |
| 303 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 304 | |
| 305 | dev_replace->committed_cursor_left = |
| 306 | dev_replace->cursor_left_last_write_of_item; |
| 307 | } |
| 308 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 309 | int btrfs_dev_replace_start(struct btrfs_root *root, |
| 310 | struct btrfs_ioctl_dev_replace_args *args) |
| 311 | { |
| 312 | struct btrfs_trans_handle *trans; |
| 313 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 314 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 315 | int ret; |
| 316 | struct btrfs_device *tgt_device = NULL; |
| 317 | struct btrfs_device *src_device = NULL; |
| 318 | |
| 319 | switch (args->start.cont_reading_from_srcdev_mode) { |
| 320 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: |
| 321 | case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: |
| 322 | break; |
| 323 | default: |
| 324 | return -EINVAL; |
| 325 | } |
| 326 | |
| 327 | if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || |
| 328 | args->start.tgtdev_name[0] == '\0') |
| 329 | return -EINVAL; |
| 330 | |
Miao Xie | 935e5cc | 2014-09-03 21:35:33 +0800 | [diff] [blame] | 331 | /* |
| 332 | * Here we commit the transaction to make sure commit_total_bytes |
| 333 | * of all the devices are updated. |
| 334 | */ |
| 335 | trans = btrfs_attach_transaction(root); |
| 336 | if (!IS_ERR(trans)) { |
| 337 | ret = btrfs_commit_transaction(trans, root); |
| 338 | if (ret) |
| 339 | return ret; |
| 340 | } else if (PTR_ERR(trans) != -ENOENT) { |
| 341 | return PTR_ERR(trans); |
| 342 | } |
| 343 | |
| 344 | /* the disk copy procedure reuses the scrub code */ |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 345 | mutex_lock(&fs_info->volume_mutex); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 346 | ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, |
| 347 | args->start.srcdev_name, |
| 348 | &src_device); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 349 | if (ret) { |
Miao Xie | 1c43366 | 2014-09-03 21:35:32 +0800 | [diff] [blame] | 350 | mutex_unlock(&fs_info->volume_mutex); |
| 351 | return ret; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 352 | } |
| 353 | |
Miao Xie | 1c43366 | 2014-09-03 21:35:32 +0800 | [diff] [blame] | 354 | ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, |
| 355 | src_device, &tgt_device); |
| 356 | mutex_unlock(&fs_info->volume_mutex); |
| 357 | if (ret) |
| 358 | return ret; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 359 | |
| 360 | btrfs_dev_replace_lock(dev_replace); |
| 361 | switch (dev_replace->replace_state) { |
| 362 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 363 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 364 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 365 | break; |
| 366 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 367 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 368 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; |
| 369 | goto leave; |
| 370 | } |
| 371 | |
| 372 | dev_replace->cont_reading_from_srcdev_mode = |
| 373 | args->start.cont_reading_from_srcdev_mode; |
| 374 | WARN_ON(!src_device); |
| 375 | dev_replace->srcdev = src_device; |
| 376 | WARN_ON(!tgt_device); |
| 377 | dev_replace->tgtdev = tgt_device; |
| 378 | |
| 379 | printk_in_rcu(KERN_INFO |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 380 | "BTRFS: dev_replace from %s (devid %llu) to %s started\n", |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 381 | src_device->missing ? "<missing disk>" : |
| 382 | rcu_str_deref(src_device->name), |
| 383 | src_device->devid, |
| 384 | rcu_str_deref(tgt_device->name)); |
| 385 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 386 | /* |
| 387 | * from now on, the writes to the srcdev are all duplicated to |
| 388 | * go to the tgtdev as well (refer to btrfs_map_block()). |
| 389 | */ |
| 390 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 391 | dev_replace->time_started = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 392 | dev_replace->cursor_left = 0; |
| 393 | dev_replace->committed_cursor_left = 0; |
| 394 | dev_replace->cursor_left_last_write_of_item = 0; |
| 395 | dev_replace->cursor_right = 0; |
| 396 | dev_replace->is_valid = 1; |
| 397 | dev_replace->item_needs_writeback = 1; |
| 398 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| 399 | btrfs_dev_replace_unlock(dev_replace); |
| 400 | |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 401 | btrfs_wait_ordered_roots(root->fs_info, -1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 402 | |
| 403 | /* force writing the updated state information to disk */ |
| 404 | trans = btrfs_start_transaction(root, 0); |
| 405 | if (IS_ERR(trans)) { |
| 406 | ret = PTR_ERR(trans); |
| 407 | btrfs_dev_replace_lock(dev_replace); |
| 408 | goto leave; |
| 409 | } |
| 410 | |
| 411 | ret = btrfs_commit_transaction(trans, root); |
| 412 | WARN_ON(ret); |
| 413 | |
| 414 | /* the disk copy procedure reuses the scrub code */ |
| 415 | ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 416 | btrfs_device_get_total_bytes(src_device), |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 417 | &dev_replace->scrub_progress, 0, 1); |
| 418 | |
| 419 | ret = btrfs_dev_replace_finishing(root->fs_info, ret); |
Eryu Guan | 2fc9f6b | 2014-10-13 12:42:12 +0800 | [diff] [blame] | 420 | /* don't warn if EINPROGRESS, someone else might be running scrub */ |
| 421 | if (ret == -EINPROGRESS) { |
| 422 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; |
| 423 | ret = 0; |
| 424 | } else { |
| 425 | WARN_ON(ret); |
| 426 | } |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 427 | |
Eryu Guan | 2fc9f6b | 2014-10-13 12:42:12 +0800 | [diff] [blame] | 428 | return ret; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 429 | |
| 430 | leave: |
| 431 | dev_replace->srcdev = NULL; |
| 432 | dev_replace->tgtdev = NULL; |
| 433 | btrfs_dev_replace_unlock(dev_replace); |
Miao Xie | 1c43366 | 2014-09-03 21:35:32 +0800 | [diff] [blame] | 434 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 435 | return ret; |
| 436 | } |
| 437 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 438 | /* |
| 439 | * blocked until all flighting bios are finished. |
| 440 | */ |
| 441 | static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info) |
| 442 | { |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 443 | set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
Zhao Lei | 7653947 | 2015-01-20 15:11:38 +0800 | [diff] [blame] | 444 | wait_event(fs_info->replace_wait, !percpu_counter_sum( |
| 445 | &fs_info->bio_counter)); |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | /* |
| 449 | * we have removed target device, it is safe to allow new bios request. |
| 450 | */ |
| 451 | static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) |
| 452 | { |
| 453 | clear_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state); |
| 454 | if (waitqueue_active(&fs_info->replace_wait)) |
| 455 | wake_up(&fs_info->replace_wait); |
| 456 | } |
| 457 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 458 | static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, |
| 459 | int scrub_ret) |
| 460 | { |
| 461 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 462 | struct btrfs_device *tgt_device; |
| 463 | struct btrfs_device *src_device; |
| 464 | struct btrfs_root *root = fs_info->tree_root; |
| 465 | u8 uuid_tmp[BTRFS_UUID_SIZE]; |
| 466 | struct btrfs_trans_handle *trans; |
| 467 | int ret = 0; |
| 468 | |
| 469 | /* don't allow cancel or unmount to disturb the finishing procedure */ |
| 470 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| 471 | |
| 472 | btrfs_dev_replace_lock(dev_replace); |
| 473 | /* was the operation canceled, or is it finished? */ |
| 474 | if (dev_replace->replace_state != |
| 475 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { |
| 476 | btrfs_dev_replace_unlock(dev_replace); |
| 477 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | tgt_device = dev_replace->tgtdev; |
| 482 | src_device = dev_replace->srcdev; |
| 483 | btrfs_dev_replace_unlock(dev_replace); |
| 484 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 485 | /* |
| 486 | * flush all outstanding I/O and inode extent mappings before the |
| 487 | * copy operation is declared as being finished |
| 488 | */ |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 489 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
Miao Xie | 3edb2a6 | 2013-01-22 10:49:33 +0000 | [diff] [blame] | 490 | if (ret) { |
| 491 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 492 | return ret; |
| 493 | } |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 494 | btrfs_wait_ordered_roots(root->fs_info, -1); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 495 | |
| 496 | trans = btrfs_start_transaction(root, 0); |
| 497 | if (IS_ERR(trans)) { |
| 498 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 499 | return PTR_ERR(trans); |
| 500 | } |
| 501 | ret = btrfs_commit_transaction(trans, root); |
| 502 | WARN_ON(ret); |
| 503 | |
Miao Xie | 67a2c45 | 2014-09-03 21:35:43 +0800 | [diff] [blame] | 504 | mutex_lock(&uuid_mutex); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 505 | /* keep away write_all_supers() during the finishing procedure */ |
| 506 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
Miao Xie | 2196d6e | 2014-09-03 21:35:41 +0800 | [diff] [blame] | 507 | mutex_lock(&root->fs_info->chunk_mutex); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 508 | btrfs_dev_replace_lock(dev_replace); |
| 509 | dev_replace->replace_state = |
| 510 | scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED |
| 511 | : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; |
| 512 | dev_replace->tgtdev = NULL; |
| 513 | dev_replace->srcdev = NULL; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 514 | dev_replace->time_stopped = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 515 | dev_replace->item_needs_writeback = 1; |
| 516 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 517 | /* replace old device with new one in mapping tree */ |
| 518 | if (!scrub_ret) { |
| 519 | btrfs_dev_replace_update_device_in_mapping_tree(fs_info, |
| 520 | src_device, |
| 521 | tgt_device); |
| 522 | } else { |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 523 | printk_in_rcu(KERN_ERR |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 524 | "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n", |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 525 | src_device->missing ? "<missing disk>" : |
| 526 | rcu_str_deref(src_device->name), |
| 527 | src_device->devid, |
| 528 | rcu_str_deref(tgt_device->name), scrub_ret); |
| 529 | btrfs_dev_replace_unlock(dev_replace); |
Miao Xie | 391cd9d | 2014-01-30 16:46:54 +0800 | [diff] [blame] | 530 | mutex_unlock(&root->fs_info->chunk_mutex); |
Miao Xie | 2196d6e | 2014-09-03 21:35:41 +0800 | [diff] [blame] | 531 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
Miao Xie | 67a2c45 | 2014-09-03 21:35:43 +0800 | [diff] [blame] | 532 | mutex_unlock(&uuid_mutex); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 533 | if (tgt_device) |
| 534 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| 535 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 536 | |
Eryu Guan | 2fc9f6b | 2014-10-13 12:42:12 +0800 | [diff] [blame] | 537 | return scrub_ret; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | printk_in_rcu(KERN_INFO |
Anand Jain | de4c296 | 2014-08-13 14:24:25 +0800 | [diff] [blame] | 541 | "BTRFS: dev_replace from %s (devid %llu) to %s finished\n", |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 542 | src_device->missing ? "<missing disk>" : |
| 543 | rcu_str_deref(src_device->name), |
| 544 | src_device->devid, |
| 545 | rcu_str_deref(tgt_device->name)); |
| 546 | tgt_device->is_tgtdev_for_dev_replace = 0; |
| 547 | tgt_device->devid = src_device->devid; |
| 548 | src_device->devid = BTRFS_DEV_REPLACE_DEVID; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 549 | memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); |
| 550 | memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); |
| 551 | memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 552 | btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); |
| 553 | btrfs_device_set_disk_total_bytes(tgt_device, |
| 554 | src_device->disk_total_bytes); |
| 555 | btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); |
Miao Xie | 935e5cc | 2014-09-03 21:35:33 +0800 | [diff] [blame] | 556 | ASSERT(list_empty(&src_device->resized_list)); |
| 557 | tgt_device->commit_total_bytes = src_device->commit_total_bytes; |
Miao Xie | ce7213c | 2014-09-03 21:35:34 +0800 | [diff] [blame] | 558 | tgt_device->commit_bytes_used = src_device->bytes_used; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 559 | if (fs_info->sb->s_bdev == src_device->bdev) |
| 560 | fs_info->sb->s_bdev = tgt_device->bdev; |
| 561 | if (fs_info->fs_devices->latest_bdev == src_device->bdev) |
| 562 | fs_info->fs_devices->latest_bdev = tgt_device->bdev; |
| 563 | 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] | 564 | fs_info->fs_devices->rw_devices++; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 565 | |
Qu Wenruo | 12b894c | 2014-08-20 16:10:15 +0800 | [diff] [blame] | 566 | btrfs_dev_replace_unlock(dev_replace); |
| 567 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 568 | btrfs_rm_dev_replace_blocked(fs_info); |
| 569 | |
Qu Wenruo | 084b6e7c | 2014-10-30 16:52:31 +0800 | [diff] [blame] | 570 | btrfs_rm_dev_replace_remove_srcdev(fs_info, src_device); |
Ilya Dryomov | 1357272 | 2013-10-02 20:41:01 +0300 | [diff] [blame] | 571 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 572 | btrfs_rm_dev_replace_unblocked(fs_info); |
| 573 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 574 | /* |
| 575 | * this is again a consistent state where no dev_replace procedure |
| 576 | * is running, the target device is part of the filesystem, the |
| 577 | * source device is not part of the filesystem anymore and its 1st |
| 578 | * superblock is scratched out so that it is no longer marked to |
| 579 | * belong to this filesystem. |
| 580 | */ |
Miao Xie | 391cd9d | 2014-01-30 16:46:54 +0800 | [diff] [blame] | 581 | mutex_unlock(&root->fs_info->chunk_mutex); |
Miao Xie | 2196d6e | 2014-09-03 21:35:41 +0800 | [diff] [blame] | 582 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
Miao Xie | 67a2c45 | 2014-09-03 21:35:43 +0800 | [diff] [blame] | 583 | mutex_unlock(&uuid_mutex); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 584 | |
Qu Wenruo | 084b6e7c | 2014-10-30 16:52:31 +0800 | [diff] [blame] | 585 | /* replace the sysfs entry */ |
| 586 | btrfs_kobj_rm_device(fs_info, src_device); |
| 587 | btrfs_kobj_add_device(fs_info, tgt_device); |
| 588 | btrfs_rm_dev_replace_free_srcdev(fs_info, src_device); |
| 589 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 590 | /* write back the superblocks */ |
| 591 | trans = btrfs_start_transaction(root, 0); |
| 592 | if (!IS_ERR(trans)) |
| 593 | btrfs_commit_transaction(trans, root); |
| 594 | |
| 595 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 596 | |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | static void btrfs_dev_replace_update_device_in_mapping_tree( |
| 601 | struct btrfs_fs_info *fs_info, |
| 602 | struct btrfs_device *srcdev, |
| 603 | struct btrfs_device *tgtdev) |
| 604 | { |
| 605 | struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; |
| 606 | struct extent_map *em; |
| 607 | struct map_lookup *map; |
| 608 | u64 start = 0; |
| 609 | int i; |
| 610 | |
| 611 | write_lock(&em_tree->lock); |
| 612 | do { |
| 613 | em = lookup_extent_mapping(em_tree, start, (u64)-1); |
| 614 | if (!em) |
| 615 | break; |
| 616 | map = (struct map_lookup *)em->bdev; |
| 617 | for (i = 0; i < map->num_stripes; i++) |
| 618 | if (srcdev == map->stripes[i].dev) |
| 619 | map->stripes[i].dev = tgtdev; |
| 620 | start = em->start + em->len; |
| 621 | free_extent_map(em); |
| 622 | } while (start); |
| 623 | write_unlock(&em_tree->lock); |
| 624 | } |
| 625 | |
| 626 | static int btrfs_dev_replace_find_srcdev(struct btrfs_root *root, u64 srcdevid, |
| 627 | char *srcdev_name, |
| 628 | struct btrfs_device **device) |
| 629 | { |
| 630 | int ret; |
| 631 | |
| 632 | if (srcdevid) { |
| 633 | ret = 0; |
| 634 | *device = btrfs_find_device(root->fs_info, srcdevid, NULL, |
| 635 | NULL); |
| 636 | if (!*device) |
| 637 | ret = -ENOENT; |
| 638 | } else { |
| 639 | ret = btrfs_find_device_missing_or_by_path(root, srcdev_name, |
| 640 | device); |
| 641 | } |
| 642 | return ret; |
| 643 | } |
| 644 | |
| 645 | void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info, |
| 646 | struct btrfs_ioctl_dev_replace_args *args) |
| 647 | { |
| 648 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 649 | struct btrfs_device *srcdev; |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 650 | |
| 651 | btrfs_dev_replace_lock(dev_replace); |
| 652 | /* even if !dev_replace_is_valid, the values are good enough for |
| 653 | * the replace_status ioctl */ |
| 654 | args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| 655 | args->status.replace_state = dev_replace->replace_state; |
| 656 | args->status.time_started = dev_replace->time_started; |
| 657 | args->status.time_stopped = dev_replace->time_stopped; |
| 658 | args->status.num_write_errors = |
| 659 | atomic64_read(&dev_replace->num_write_errors); |
| 660 | args->status.num_uncorrectable_read_errors = |
| 661 | atomic64_read(&dev_replace->num_uncorrectable_read_errors); |
| 662 | switch (dev_replace->replace_state) { |
| 663 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 664 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 665 | args->status.progress_1000 = 0; |
| 666 | break; |
| 667 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 668 | args->status.progress_1000 = 1000; |
| 669 | break; |
| 670 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 671 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 672 | srcdev = dev_replace->srcdev; |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 673 | args->status.progress_1000 = div_u64(dev_replace->cursor_left, |
| 674 | div_u64(btrfs_device_get_total_bytes(srcdev), 1000)); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 675 | break; |
| 676 | } |
| 677 | btrfs_dev_replace_unlock(dev_replace); |
| 678 | } |
| 679 | |
| 680 | int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info, |
| 681 | struct btrfs_ioctl_dev_replace_args *args) |
| 682 | { |
| 683 | args->result = __btrfs_dev_replace_cancel(fs_info); |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | static u64 __btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info) |
| 688 | { |
| 689 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 690 | struct btrfs_device *tgt_device = NULL; |
| 691 | struct btrfs_trans_handle *trans; |
| 692 | struct btrfs_root *root = fs_info->tree_root; |
| 693 | u64 result; |
| 694 | int ret; |
| 695 | |
Ilya Dryomov | e649e58 | 2013-10-10 20:40:21 +0300 | [diff] [blame] | 696 | if (fs_info->sb->s_flags & MS_RDONLY) |
| 697 | return -EROFS; |
| 698 | |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 699 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| 700 | btrfs_dev_replace_lock(dev_replace); |
| 701 | switch (dev_replace->replace_state) { |
| 702 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 703 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 704 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 705 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED; |
| 706 | btrfs_dev_replace_unlock(dev_replace); |
| 707 | goto leave; |
| 708 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 709 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 710 | result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; |
| 711 | tgt_device = dev_replace->tgtdev; |
| 712 | dev_replace->tgtdev = NULL; |
| 713 | dev_replace->srcdev = NULL; |
| 714 | break; |
| 715 | } |
| 716 | dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 717 | dev_replace->time_stopped = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 718 | dev_replace->item_needs_writeback = 1; |
| 719 | btrfs_dev_replace_unlock(dev_replace); |
| 720 | btrfs_scrub_cancel(fs_info); |
| 721 | |
| 722 | trans = btrfs_start_transaction(root, 0); |
| 723 | if (IS_ERR(trans)) { |
| 724 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 725 | return PTR_ERR(trans); |
| 726 | } |
| 727 | ret = btrfs_commit_transaction(trans, root); |
| 728 | WARN_ON(ret); |
| 729 | if (tgt_device) |
| 730 | btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); |
| 731 | |
| 732 | leave: |
| 733 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 734 | return result; |
| 735 | } |
| 736 | |
| 737 | void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info) |
| 738 | { |
| 739 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 740 | |
| 741 | mutex_lock(&dev_replace->lock_finishing_cancel_unmount); |
| 742 | btrfs_dev_replace_lock(dev_replace); |
| 743 | switch (dev_replace->replace_state) { |
| 744 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 745 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 746 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 747 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 748 | break; |
| 749 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 750 | dev_replace->replace_state = |
| 751 | BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED; |
Zach Brown | 4546bca | 2013-10-16 12:10:32 -0700 | [diff] [blame] | 752 | dev_replace->time_stopped = get_seconds(); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 753 | dev_replace->item_needs_writeback = 1; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 754 | btrfs_info(fs_info, "suspending dev_replace for unmount"); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 755 | break; |
| 756 | } |
| 757 | |
| 758 | btrfs_dev_replace_unlock(dev_replace); |
| 759 | mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); |
| 760 | } |
| 761 | |
| 762 | /* resume dev_replace procedure that was interrupted by unmount */ |
| 763 | int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info) |
| 764 | { |
| 765 | struct task_struct *task; |
| 766 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 767 | |
| 768 | btrfs_dev_replace_lock(dev_replace); |
| 769 | switch (dev_replace->replace_state) { |
| 770 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 771 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 772 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 773 | btrfs_dev_replace_unlock(dev_replace); |
| 774 | return 0; |
| 775 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 776 | break; |
| 777 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 778 | dev_replace->replace_state = |
| 779 | BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; |
| 780 | break; |
| 781 | } |
| 782 | if (!dev_replace->tgtdev || !dev_replace->tgtdev->bdev) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 783 | btrfs_info(fs_info, "cannot continue dev_replace, tgtdev is missing"); |
| 784 | btrfs_info(fs_info, |
| 785 | "you may cancel the operation after 'mount -o degraded'"); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 786 | btrfs_dev_replace_unlock(dev_replace); |
| 787 | return 0; |
| 788 | } |
| 789 | btrfs_dev_replace_unlock(dev_replace); |
| 790 | |
| 791 | WARN_ON(atomic_xchg( |
| 792 | &fs_info->mutually_exclusive_operation_running, 1)); |
| 793 | task = kthread_run(btrfs_dev_replace_kthread, fs_info, "btrfs-devrepl"); |
Rusty Russell | 8c6ffba | 2013-07-15 11:20:32 +0930 | [diff] [blame] | 794 | return PTR_ERR_OR_ZERO(task); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | static int btrfs_dev_replace_kthread(void *data) |
| 798 | { |
| 799 | struct btrfs_fs_info *fs_info = data; |
| 800 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 801 | struct btrfs_ioctl_dev_replace_args *status_args; |
| 802 | u64 progress; |
| 803 | |
| 804 | status_args = kzalloc(sizeof(*status_args), GFP_NOFS); |
| 805 | if (status_args) { |
| 806 | btrfs_dev_replace_status(fs_info, status_args); |
| 807 | progress = status_args->status.progress_1000; |
| 808 | kfree(status_args); |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 809 | progress = div_u64(progress, 10); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 810 | printk_in_rcu(KERN_INFO |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 811 | "BTRFS: continuing dev_replace from %s (devid %llu) to %s @%u%%\n", |
| 812 | dev_replace->srcdev->missing ? "<missing disk>" : |
| 813 | rcu_str_deref(dev_replace->srcdev->name), |
| 814 | dev_replace->srcdev->devid, |
| 815 | dev_replace->tgtdev ? |
| 816 | rcu_str_deref(dev_replace->tgtdev->name) : |
| 817 | "<missing target disk>", |
| 818 | (unsigned int)progress); |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 819 | } |
| 820 | btrfs_dev_replace_continue_on_mount(fs_info); |
| 821 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); |
| 822 | |
| 823 | return 0; |
| 824 | } |
| 825 | |
| 826 | static int btrfs_dev_replace_continue_on_mount(struct btrfs_fs_info *fs_info) |
| 827 | { |
| 828 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
| 829 | int ret; |
| 830 | |
| 831 | ret = btrfs_scrub_dev(fs_info, dev_replace->srcdev->devid, |
| 832 | dev_replace->committed_cursor_left, |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 833 | btrfs_device_get_total_bytes(dev_replace->srcdev), |
Stefan Behrens | e93c89c | 2012-11-05 17:33:06 +0100 | [diff] [blame] | 834 | &dev_replace->scrub_progress, 0, 1); |
| 835 | ret = btrfs_dev_replace_finishing(fs_info, ret); |
| 836 | WARN_ON(ret); |
| 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace) |
| 841 | { |
| 842 | if (!dev_replace->is_valid) |
| 843 | return 0; |
| 844 | |
| 845 | switch (dev_replace->replace_state) { |
| 846 | case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: |
| 847 | case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: |
| 848 | case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: |
| 849 | return 0; |
| 850 | case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: |
| 851 | case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: |
| 852 | /* |
| 853 | * return true even if tgtdev is missing (this is |
| 854 | * something that can happen if the dev_replace |
| 855 | * procedure is suspended by an umount and then |
| 856 | * the tgtdev is missing (or "btrfs dev scan") was |
| 857 | * not called and the the filesystem is remounted |
| 858 | * in degraded state. This does not stop the |
| 859 | * dev_replace procedure. It needs to be canceled |
| 860 | * manually if the cancelation is wanted. |
| 861 | */ |
| 862 | break; |
| 863 | } |
| 864 | return 1; |
| 865 | } |
| 866 | |
| 867 | void btrfs_dev_replace_lock(struct btrfs_dev_replace *dev_replace) |
| 868 | { |
| 869 | /* the beginning is just an optimization for the typical case */ |
| 870 | if (atomic_read(&dev_replace->nesting_level) == 0) { |
| 871 | acquire_lock: |
| 872 | /* this is not a nested case where the same thread |
| 873 | * is trying to acqurire the same lock twice */ |
| 874 | mutex_lock(&dev_replace->lock); |
| 875 | mutex_lock(&dev_replace->lock_management_lock); |
| 876 | dev_replace->lock_owner = current->pid; |
| 877 | atomic_inc(&dev_replace->nesting_level); |
| 878 | mutex_unlock(&dev_replace->lock_management_lock); |
| 879 | return; |
| 880 | } |
| 881 | |
| 882 | mutex_lock(&dev_replace->lock_management_lock); |
| 883 | if (atomic_read(&dev_replace->nesting_level) > 0 && |
| 884 | dev_replace->lock_owner == current->pid) { |
| 885 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); |
| 886 | atomic_inc(&dev_replace->nesting_level); |
| 887 | mutex_unlock(&dev_replace->lock_management_lock); |
| 888 | return; |
| 889 | } |
| 890 | |
| 891 | mutex_unlock(&dev_replace->lock_management_lock); |
| 892 | goto acquire_lock; |
| 893 | } |
| 894 | |
| 895 | void btrfs_dev_replace_unlock(struct btrfs_dev_replace *dev_replace) |
| 896 | { |
| 897 | WARN_ON(!mutex_is_locked(&dev_replace->lock)); |
| 898 | mutex_lock(&dev_replace->lock_management_lock); |
| 899 | WARN_ON(atomic_read(&dev_replace->nesting_level) < 1); |
| 900 | WARN_ON(dev_replace->lock_owner != current->pid); |
| 901 | atomic_dec(&dev_replace->nesting_level); |
| 902 | if (atomic_read(&dev_replace->nesting_level) == 0) { |
| 903 | dev_replace->lock_owner = 0; |
| 904 | mutex_unlock(&dev_replace->lock_management_lock); |
| 905 | mutex_unlock(&dev_replace->lock); |
| 906 | } else { |
| 907 | mutex_unlock(&dev_replace->lock_management_lock); |
| 908 | } |
| 909 | } |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 910 | |
| 911 | void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info) |
| 912 | { |
| 913 | percpu_counter_inc(&fs_info->bio_counter); |
| 914 | } |
| 915 | |
Miao Xie | 4245215 | 2014-11-25 16:39:28 +0800 | [diff] [blame] | 916 | 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] | 917 | { |
Miao Xie | 4245215 | 2014-11-25 16:39:28 +0800 | [diff] [blame] | 918 | percpu_counter_sub(&fs_info->bio_counter, amount); |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 919 | |
| 920 | if (waitqueue_active(&fs_info->replace_wait)) |
| 921 | wake_up(&fs_info->replace_wait); |
| 922 | } |
| 923 | |
| 924 | void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info) |
| 925 | { |
Zhao Lei | 09dd7a0 | 2015-01-20 15:11:37 +0800 | [diff] [blame] | 926 | while (1) { |
| 927 | percpu_counter_inc(&fs_info->bio_counter); |
| 928 | if (likely(!test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
| 929 | &fs_info->fs_state))) |
| 930 | break; |
| 931 | |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 932 | btrfs_bio_counter_dec(fs_info); |
| 933 | wait_event(fs_info->replace_wait, |
| 934 | !test_bit(BTRFS_FS_STATE_DEV_REPLACING, |
| 935 | &fs_info->fs_state)); |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 936 | } |
Miao Xie | c404e0d | 2014-01-30 16:46:55 +0800 | [diff] [blame] | 937 | } |