Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 STRATO. 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 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 19 | #include <linux/blkdev.h> |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 20 | #include <linux/ratelimit.h> |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 21 | #include "ctree.h" |
| 22 | #include "volumes.h" |
| 23 | #include "disk-io.h" |
| 24 | #include "ordered-data.h" |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 25 | #include "transaction.h" |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 26 | #include "backref.h" |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 27 | #include "extent_io.h" |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 28 | #include "check-integrity.h" |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 29 | |
| 30 | /* |
| 31 | * This is only the first step towards a full-features scrub. It reads all |
| 32 | * extent and super block and verifies the checksums. In case a bad checksum |
| 33 | * is found or the extent cannot be read, good data will be written back if |
| 34 | * any can be found. |
| 35 | * |
| 36 | * Future enhancements: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 37 | * - In case an unrepairable extent is encountered, track which files are |
| 38 | * affected and report them |
| 39 | * - In case of a read error on files with nodatasum, map the file and read |
| 40 | * the extent to trigger a writeback of the good copy |
| 41 | * - track and record media errors, throw out bad devices |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 42 | * - add a mode to also read unallocated space |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 43 | */ |
| 44 | |
| 45 | struct scrub_bio; |
| 46 | struct scrub_page; |
| 47 | struct scrub_dev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 48 | static void scrub_bio_end_io(struct bio *bio, int err); |
| 49 | static void scrub_checksum(struct btrfs_work *work); |
| 50 | static int scrub_checksum_data(struct scrub_dev *sdev, |
| 51 | struct scrub_page *spag, void *buffer); |
| 52 | static int scrub_checksum_tree_block(struct scrub_dev *sdev, |
| 53 | struct scrub_page *spag, u64 logical, |
| 54 | void *buffer); |
| 55 | static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer); |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 56 | static int scrub_fixup_check(struct scrub_bio *sbio, int ix); |
| 57 | static void scrub_fixup_end_io(struct bio *bio, int err); |
| 58 | static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector, |
| 59 | struct page *page); |
| 60 | static void scrub_fixup(struct scrub_bio *sbio, int ix); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 61 | |
| 62 | #define SCRUB_PAGES_PER_BIO 16 /* 64k per bio */ |
| 63 | #define SCRUB_BIOS_PER_DEV 16 /* 1 MB per device in flight */ |
| 64 | |
| 65 | struct scrub_page { |
| 66 | u64 flags; /* extent flags */ |
| 67 | u64 generation; |
Jan Schmidt | e12fa9c | 2011-06-17 15:55:21 +0200 | [diff] [blame] | 68 | int mirror_num; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 69 | int have_csum; |
| 70 | u8 csum[BTRFS_CSUM_SIZE]; |
| 71 | }; |
| 72 | |
| 73 | struct scrub_bio { |
| 74 | int index; |
| 75 | struct scrub_dev *sdev; |
| 76 | struct bio *bio; |
| 77 | int err; |
| 78 | u64 logical; |
| 79 | u64 physical; |
| 80 | struct scrub_page spag[SCRUB_PAGES_PER_BIO]; |
| 81 | u64 count; |
| 82 | int next_free; |
| 83 | struct btrfs_work work; |
| 84 | }; |
| 85 | |
| 86 | struct scrub_dev { |
| 87 | struct scrub_bio *bios[SCRUB_BIOS_PER_DEV]; |
| 88 | struct btrfs_device *dev; |
| 89 | int first_free; |
| 90 | int curr; |
| 91 | atomic_t in_flight; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 92 | atomic_t fixup_cnt; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 93 | spinlock_t list_lock; |
| 94 | wait_queue_head_t list_wait; |
| 95 | u16 csum_size; |
| 96 | struct list_head csum_list; |
| 97 | atomic_t cancel_req; |
Arne Jansen | 8628764 | 2011-03-23 16:34:19 +0100 | [diff] [blame] | 98 | int readonly; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 99 | /* |
| 100 | * statistics |
| 101 | */ |
| 102 | struct btrfs_scrub_progress stat; |
| 103 | spinlock_t stat_lock; |
| 104 | }; |
| 105 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 106 | struct scrub_fixup_nodatasum { |
| 107 | struct scrub_dev *sdev; |
| 108 | u64 logical; |
| 109 | struct btrfs_root *root; |
| 110 | struct btrfs_work work; |
| 111 | int mirror_num; |
| 112 | }; |
| 113 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 114 | struct scrub_warning { |
| 115 | struct btrfs_path *path; |
| 116 | u64 extent_item_size; |
| 117 | char *scratch_buf; |
| 118 | char *msg_buf; |
| 119 | const char *errstr; |
| 120 | sector_t sector; |
| 121 | u64 logical; |
| 122 | struct btrfs_device *dev; |
| 123 | int msg_bufsize; |
| 124 | int scratch_bufsize; |
| 125 | }; |
| 126 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 127 | static void scrub_free_csums(struct scrub_dev *sdev) |
| 128 | { |
| 129 | while (!list_empty(&sdev->csum_list)) { |
| 130 | struct btrfs_ordered_sum *sum; |
| 131 | sum = list_first_entry(&sdev->csum_list, |
| 132 | struct btrfs_ordered_sum, list); |
| 133 | list_del(&sum->list); |
| 134 | kfree(sum); |
| 135 | } |
| 136 | } |
| 137 | |
Arne Jansen | 1bc8779 | 2011-05-28 21:57:55 +0200 | [diff] [blame] | 138 | static void scrub_free_bio(struct bio *bio) |
| 139 | { |
| 140 | int i; |
| 141 | struct page *last_page = NULL; |
| 142 | |
| 143 | if (!bio) |
| 144 | return; |
| 145 | |
| 146 | for (i = 0; i < bio->bi_vcnt; ++i) { |
| 147 | if (bio->bi_io_vec[i].bv_page == last_page) |
| 148 | continue; |
| 149 | last_page = bio->bi_io_vec[i].bv_page; |
| 150 | __free_page(last_page); |
| 151 | } |
| 152 | bio_put(bio); |
| 153 | } |
| 154 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 155 | static noinline_for_stack void scrub_free_dev(struct scrub_dev *sdev) |
| 156 | { |
| 157 | int i; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 158 | |
| 159 | if (!sdev) |
| 160 | return; |
| 161 | |
| 162 | for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) { |
| 163 | struct scrub_bio *sbio = sdev->bios[i]; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 164 | |
| 165 | if (!sbio) |
| 166 | break; |
| 167 | |
Arne Jansen | 1bc8779 | 2011-05-28 21:57:55 +0200 | [diff] [blame] | 168 | scrub_free_bio(sbio->bio); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 169 | kfree(sbio); |
| 170 | } |
| 171 | |
| 172 | scrub_free_csums(sdev); |
| 173 | kfree(sdev); |
| 174 | } |
| 175 | |
| 176 | static noinline_for_stack |
| 177 | struct scrub_dev *scrub_setup_dev(struct btrfs_device *dev) |
| 178 | { |
| 179 | struct scrub_dev *sdev; |
| 180 | int i; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 181 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
| 182 | |
| 183 | sdev = kzalloc(sizeof(*sdev), GFP_NOFS); |
| 184 | if (!sdev) |
| 185 | goto nomem; |
| 186 | sdev->dev = dev; |
| 187 | for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 188 | struct scrub_bio *sbio; |
| 189 | |
| 190 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); |
| 191 | if (!sbio) |
| 192 | goto nomem; |
| 193 | sdev->bios[i] = sbio; |
| 194 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 195 | sbio->index = i; |
| 196 | sbio->sdev = sdev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 197 | sbio->count = 0; |
| 198 | sbio->work.func = scrub_checksum; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 199 | |
| 200 | if (i != SCRUB_BIOS_PER_DEV-1) |
| 201 | sdev->bios[i]->next_free = i + 1; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 202 | else |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 203 | sdev->bios[i]->next_free = -1; |
| 204 | } |
| 205 | sdev->first_free = 0; |
| 206 | sdev->curr = -1; |
| 207 | atomic_set(&sdev->in_flight, 0); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 208 | atomic_set(&sdev->fixup_cnt, 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 209 | atomic_set(&sdev->cancel_req, 0); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 210 | sdev->csum_size = btrfs_super_csum_size(fs_info->super_copy); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 211 | INIT_LIST_HEAD(&sdev->csum_list); |
| 212 | |
| 213 | spin_lock_init(&sdev->list_lock); |
| 214 | spin_lock_init(&sdev->stat_lock); |
| 215 | init_waitqueue_head(&sdev->list_wait); |
| 216 | return sdev; |
| 217 | |
| 218 | nomem: |
| 219 | scrub_free_dev(sdev); |
| 220 | return ERR_PTR(-ENOMEM); |
| 221 | } |
| 222 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 223 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx) |
| 224 | { |
| 225 | u64 isize; |
| 226 | u32 nlink; |
| 227 | int ret; |
| 228 | int i; |
| 229 | struct extent_buffer *eb; |
| 230 | struct btrfs_inode_item *inode_item; |
| 231 | struct scrub_warning *swarn = ctx; |
| 232 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
| 233 | struct inode_fs_paths *ipath = NULL; |
| 234 | struct btrfs_root *local_root; |
| 235 | struct btrfs_key root_key; |
| 236 | |
| 237 | root_key.objectid = root; |
| 238 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 239 | root_key.offset = (u64)-1; |
| 240 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); |
| 241 | if (IS_ERR(local_root)) { |
| 242 | ret = PTR_ERR(local_root); |
| 243 | goto err; |
| 244 | } |
| 245 | |
| 246 | ret = inode_item_info(inum, 0, local_root, swarn->path); |
| 247 | if (ret) { |
| 248 | btrfs_release_path(swarn->path); |
| 249 | goto err; |
| 250 | } |
| 251 | |
| 252 | eb = swarn->path->nodes[0]; |
| 253 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], |
| 254 | struct btrfs_inode_item); |
| 255 | isize = btrfs_inode_size(eb, inode_item); |
| 256 | nlink = btrfs_inode_nlink(eb, inode_item); |
| 257 | btrfs_release_path(swarn->path); |
| 258 | |
| 259 | ipath = init_ipath(4096, local_root, swarn->path); |
Dan Carpenter | 26bdef5 | 2011-11-16 11:28:01 +0300 | [diff] [blame] | 260 | if (IS_ERR(ipath)) { |
| 261 | ret = PTR_ERR(ipath); |
| 262 | ipath = NULL; |
| 263 | goto err; |
| 264 | } |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 265 | ret = paths_from_inode(inum, ipath); |
| 266 | |
| 267 | if (ret < 0) |
| 268 | goto err; |
| 269 | |
| 270 | /* |
| 271 | * we deliberately ignore the bit ipath might have been too small to |
| 272 | * hold all of the paths here |
| 273 | */ |
| 274 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) |
| 275 | printk(KERN_WARNING "btrfs: %s at logical %llu on dev " |
| 276 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
| 277 | "length %llu, links %u (path: %s)\n", swarn->errstr, |
| 278 | swarn->logical, swarn->dev->name, |
| 279 | (unsigned long long)swarn->sector, root, inum, offset, |
| 280 | min(isize - offset, (u64)PAGE_SIZE), nlink, |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 281 | (char *)(unsigned long)ipath->fspath->val[i]); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 282 | |
| 283 | free_ipath(ipath); |
| 284 | return 0; |
| 285 | |
| 286 | err: |
| 287 | printk(KERN_WARNING "btrfs: %s at logical %llu on dev " |
| 288 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
| 289 | "resolving failed with ret=%d\n", swarn->errstr, |
| 290 | swarn->logical, swarn->dev->name, |
| 291 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
| 292 | |
| 293 | free_ipath(ipath); |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | static void scrub_print_warning(const char *errstr, struct scrub_bio *sbio, |
| 298 | int ix) |
| 299 | { |
| 300 | struct btrfs_device *dev = sbio->sdev->dev; |
| 301 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
| 302 | struct btrfs_path *path; |
| 303 | struct btrfs_key found_key; |
| 304 | struct extent_buffer *eb; |
| 305 | struct btrfs_extent_item *ei; |
| 306 | struct scrub_warning swarn; |
| 307 | u32 item_size; |
| 308 | int ret; |
| 309 | u64 ref_root; |
| 310 | u8 ref_level; |
| 311 | unsigned long ptr = 0; |
| 312 | const int bufsize = 4096; |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 313 | u64 extent_item_pos; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 314 | |
| 315 | path = btrfs_alloc_path(); |
| 316 | |
| 317 | swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS); |
| 318 | swarn.msg_buf = kmalloc(bufsize, GFP_NOFS); |
| 319 | swarn.sector = (sbio->physical + ix * PAGE_SIZE) >> 9; |
| 320 | swarn.logical = sbio->logical + ix * PAGE_SIZE; |
| 321 | swarn.errstr = errstr; |
| 322 | swarn.dev = dev; |
| 323 | swarn.msg_bufsize = bufsize; |
| 324 | swarn.scratch_bufsize = bufsize; |
| 325 | |
| 326 | if (!path || !swarn.scratch_buf || !swarn.msg_buf) |
| 327 | goto out; |
| 328 | |
| 329 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key); |
| 330 | if (ret < 0) |
| 331 | goto out; |
| 332 | |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 333 | extent_item_pos = swarn.logical - found_key.objectid; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 334 | swarn.extent_item_size = found_key.offset; |
| 335 | |
| 336 | eb = path->nodes[0]; |
| 337 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); |
| 338 | item_size = btrfs_item_size_nr(eb, path->slots[0]); |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 339 | btrfs_release_path(path); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 340 | |
| 341 | if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
| 342 | do { |
| 343 | ret = tree_backref_for_extent(&ptr, eb, ei, item_size, |
| 344 | &ref_root, &ref_level); |
| 345 | printk(KERN_WARNING "%s at logical %llu on dev %s, " |
| 346 | "sector %llu: metadata %s (level %d) in tree " |
| 347 | "%llu\n", errstr, swarn.logical, dev->name, |
| 348 | (unsigned long long)swarn.sector, |
| 349 | ref_level ? "node" : "leaf", |
| 350 | ret < 0 ? -1 : ref_level, |
| 351 | ret < 0 ? -1 : ref_root); |
| 352 | } while (ret != 1); |
| 353 | } else { |
| 354 | swarn.path = path; |
| 355 | iterate_extent_inodes(fs_info, path, found_key.objectid, |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 356 | extent_item_pos, |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 357 | scrub_print_warning_inode, &swarn); |
| 358 | } |
| 359 | |
| 360 | out: |
| 361 | btrfs_free_path(path); |
| 362 | kfree(swarn.scratch_buf); |
| 363 | kfree(swarn.msg_buf); |
| 364 | } |
| 365 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 366 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *ctx) |
| 367 | { |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 368 | struct page *page = NULL; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 369 | unsigned long index; |
| 370 | struct scrub_fixup_nodatasum *fixup = ctx; |
| 371 | int ret; |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 372 | int corrected = 0; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 373 | struct btrfs_key key; |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 374 | struct inode *inode = NULL; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 375 | u64 end = offset + PAGE_SIZE - 1; |
| 376 | struct btrfs_root *local_root; |
| 377 | |
| 378 | key.objectid = root; |
| 379 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 380 | key.offset = (u64)-1; |
| 381 | local_root = btrfs_read_fs_root_no_name(fixup->root->fs_info, &key); |
| 382 | if (IS_ERR(local_root)) |
| 383 | return PTR_ERR(local_root); |
| 384 | |
| 385 | key.type = BTRFS_INODE_ITEM_KEY; |
| 386 | key.objectid = inum; |
| 387 | key.offset = 0; |
| 388 | inode = btrfs_iget(fixup->root->fs_info->sb, &key, local_root, NULL); |
| 389 | if (IS_ERR(inode)) |
| 390 | return PTR_ERR(inode); |
| 391 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 392 | index = offset >> PAGE_CACHE_SHIFT; |
| 393 | |
| 394 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 395 | if (!page) { |
| 396 | ret = -ENOMEM; |
| 397 | goto out; |
| 398 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 399 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 400 | if (PageUptodate(page)) { |
| 401 | struct btrfs_mapping_tree *map_tree; |
| 402 | if (PageDirty(page)) { |
| 403 | /* |
| 404 | * we need to write the data to the defect sector. the |
| 405 | * data that was in that sector is not in memory, |
| 406 | * because the page was modified. we must not write the |
| 407 | * modified page to that sector. |
| 408 | * |
| 409 | * TODO: what could be done here: wait for the delalloc |
| 410 | * runner to write out that page (might involve |
| 411 | * COW) and see whether the sector is still |
| 412 | * referenced afterwards. |
| 413 | * |
| 414 | * For the meantime, we'll treat this error |
| 415 | * incorrectable, although there is a chance that a |
| 416 | * later scrub will find the bad sector again and that |
| 417 | * there's no dirty page in memory, then. |
| 418 | */ |
| 419 | ret = -EIO; |
| 420 | goto out; |
| 421 | } |
| 422 | map_tree = &BTRFS_I(inode)->root->fs_info->mapping_tree; |
| 423 | ret = repair_io_failure(map_tree, offset, PAGE_SIZE, |
| 424 | fixup->logical, page, |
| 425 | fixup->mirror_num); |
| 426 | unlock_page(page); |
| 427 | corrected = !ret; |
| 428 | } else { |
| 429 | /* |
| 430 | * we need to get good data first. the general readpage path |
| 431 | * will call repair_io_failure for us, we just have to make |
| 432 | * sure we read the bad mirror. |
| 433 | */ |
| 434 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, |
| 435 | EXTENT_DAMAGED, GFP_NOFS); |
| 436 | if (ret) { |
| 437 | /* set_extent_bits should give proper error */ |
| 438 | WARN_ON(ret > 0); |
| 439 | if (ret > 0) |
| 440 | ret = -EFAULT; |
| 441 | goto out; |
| 442 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 443 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 444 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, |
| 445 | btrfs_get_extent, |
| 446 | fixup->mirror_num); |
| 447 | wait_on_page_locked(page); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 448 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 449 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, |
| 450 | end, EXTENT_DAMAGED, 0, NULL); |
| 451 | if (!corrected) |
| 452 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, |
| 453 | EXTENT_DAMAGED, GFP_NOFS); |
| 454 | } |
| 455 | |
| 456 | out: |
| 457 | if (page) |
| 458 | put_page(page); |
| 459 | if (inode) |
| 460 | iput(inode); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 461 | |
| 462 | if (ret < 0) |
| 463 | return ret; |
| 464 | |
| 465 | if (ret == 0 && corrected) { |
| 466 | /* |
| 467 | * we only need to call readpage for one of the inodes belonging |
| 468 | * to this extent. so make iterate_extent_inodes stop |
| 469 | */ |
| 470 | return 1; |
| 471 | } |
| 472 | |
| 473 | return -EIO; |
| 474 | } |
| 475 | |
| 476 | static void scrub_fixup_nodatasum(struct btrfs_work *work) |
| 477 | { |
| 478 | int ret; |
| 479 | struct scrub_fixup_nodatasum *fixup; |
| 480 | struct scrub_dev *sdev; |
| 481 | struct btrfs_trans_handle *trans = NULL; |
| 482 | struct btrfs_fs_info *fs_info; |
| 483 | struct btrfs_path *path; |
| 484 | int uncorrectable = 0; |
| 485 | |
| 486 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); |
| 487 | sdev = fixup->sdev; |
| 488 | fs_info = fixup->root->fs_info; |
| 489 | |
| 490 | path = btrfs_alloc_path(); |
| 491 | if (!path) { |
| 492 | spin_lock(&sdev->stat_lock); |
| 493 | ++sdev->stat.malloc_errors; |
| 494 | spin_unlock(&sdev->stat_lock); |
| 495 | uncorrectable = 1; |
| 496 | goto out; |
| 497 | } |
| 498 | |
| 499 | trans = btrfs_join_transaction(fixup->root); |
| 500 | if (IS_ERR(trans)) { |
| 501 | uncorrectable = 1; |
| 502 | goto out; |
| 503 | } |
| 504 | |
| 505 | /* |
| 506 | * the idea is to trigger a regular read through the standard path. we |
| 507 | * read a page from the (failed) logical address by specifying the |
| 508 | * corresponding copynum of the failed sector. thus, that readpage is |
| 509 | * expected to fail. |
| 510 | * that is the point where on-the-fly error correction will kick in |
| 511 | * (once it's finished) and rewrite the failed sector if a good copy |
| 512 | * can be found. |
| 513 | */ |
| 514 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, |
| 515 | path, scrub_fixup_readpage, |
| 516 | fixup); |
| 517 | if (ret < 0) { |
| 518 | uncorrectable = 1; |
| 519 | goto out; |
| 520 | } |
| 521 | WARN_ON(ret != 1); |
| 522 | |
| 523 | spin_lock(&sdev->stat_lock); |
| 524 | ++sdev->stat.corrected_errors; |
| 525 | spin_unlock(&sdev->stat_lock); |
| 526 | |
| 527 | out: |
| 528 | if (trans && !IS_ERR(trans)) |
| 529 | btrfs_end_transaction(trans, fixup->root); |
| 530 | if (uncorrectable) { |
| 531 | spin_lock(&sdev->stat_lock); |
| 532 | ++sdev->stat.uncorrectable_errors; |
| 533 | spin_unlock(&sdev->stat_lock); |
| 534 | printk_ratelimited(KERN_ERR "btrfs: unable to fixup " |
| 535 | "(nodatasum) error at logical %llu\n", |
| 536 | fixup->logical); |
| 537 | } |
| 538 | |
| 539 | btrfs_free_path(path); |
| 540 | kfree(fixup); |
| 541 | |
| 542 | /* see caller why we're pretending to be paused in the scrub counters */ |
| 543 | mutex_lock(&fs_info->scrub_lock); |
| 544 | atomic_dec(&fs_info->scrubs_running); |
| 545 | atomic_dec(&fs_info->scrubs_paused); |
| 546 | mutex_unlock(&fs_info->scrub_lock); |
| 547 | atomic_dec(&sdev->fixup_cnt); |
| 548 | wake_up(&fs_info->scrub_pause_wait); |
| 549 | wake_up(&sdev->list_wait); |
| 550 | } |
| 551 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 552 | /* |
| 553 | * scrub_recheck_error gets called when either verification of the page |
| 554 | * failed or the bio failed to read, e.g. with EIO. In the latter case, |
| 555 | * recheck_error gets called for every page in the bio, even though only |
| 556 | * one may be bad |
| 557 | */ |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 558 | static int scrub_recheck_error(struct scrub_bio *sbio, int ix) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 559 | { |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 560 | struct scrub_dev *sdev = sbio->sdev; |
| 561 | u64 sector = (sbio->physical + ix * PAGE_SIZE) >> 9; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 562 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
| 563 | DEFAULT_RATELIMIT_BURST); |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 564 | |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 565 | if (sbio->err) { |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 566 | if (scrub_fixup_io(READ, sbio->sdev->dev->bdev, sector, |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 567 | sbio->bio->bi_io_vec[ix].bv_page) == 0) { |
| 568 | if (scrub_fixup_check(sbio, ix) == 0) |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 569 | return 0; |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 570 | } |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 571 | if (__ratelimit(&_rs)) |
| 572 | scrub_print_warning("i/o error", sbio, ix); |
| 573 | } else { |
| 574 | if (__ratelimit(&_rs)) |
| 575 | scrub_print_warning("checksum error", sbio, ix); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 576 | } |
| 577 | |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 578 | spin_lock(&sdev->stat_lock); |
| 579 | ++sdev->stat.read_errors; |
| 580 | spin_unlock(&sdev->stat_lock); |
| 581 | |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 582 | scrub_fixup(sbio, ix); |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 583 | return 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 584 | } |
| 585 | |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 586 | static int scrub_fixup_check(struct scrub_bio *sbio, int ix) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 587 | { |
| 588 | int ret = 1; |
| 589 | struct page *page; |
| 590 | void *buffer; |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 591 | u64 flags = sbio->spag[ix].flags; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 592 | |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 593 | page = sbio->bio->bi_io_vec[ix].bv_page; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 594 | buffer = kmap_atomic(page, KM_USER0); |
| 595 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 596 | ret = scrub_checksum_data(sbio->sdev, |
| 597 | sbio->spag + ix, buffer); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 598 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 599 | ret = scrub_checksum_tree_block(sbio->sdev, |
| 600 | sbio->spag + ix, |
| 601 | sbio->logical + ix * PAGE_SIZE, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 602 | buffer); |
| 603 | } else { |
| 604 | WARN_ON(1); |
| 605 | } |
| 606 | kunmap_atomic(buffer, KM_USER0); |
| 607 | |
| 608 | return ret; |
| 609 | } |
| 610 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 611 | static void scrub_fixup_end_io(struct bio *bio, int err) |
| 612 | { |
| 613 | complete((struct completion *)bio->bi_private); |
| 614 | } |
| 615 | |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 616 | static void scrub_fixup(struct scrub_bio *sbio, int ix) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 617 | { |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 618 | struct scrub_dev *sdev = sbio->sdev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 619 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; |
| 620 | struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 621 | struct btrfs_bio *bbio = NULL; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 622 | struct scrub_fixup_nodatasum *fixup; |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 623 | u64 logical = sbio->logical + ix * PAGE_SIZE; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 624 | u64 length; |
| 625 | int i; |
| 626 | int ret; |
| 627 | DECLARE_COMPLETION_ONSTACK(complete); |
| 628 | |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 629 | if ((sbio->spag[ix].flags & BTRFS_EXTENT_FLAG_DATA) && |
| 630 | (sbio->spag[ix].have_csum == 0)) { |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 631 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); |
| 632 | if (!fixup) |
| 633 | goto uncorrectable; |
| 634 | fixup->sdev = sdev; |
| 635 | fixup->logical = logical; |
| 636 | fixup->root = fs_info->extent_root; |
| 637 | fixup->mirror_num = sbio->spag[ix].mirror_num; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 638 | /* |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 639 | * increment scrubs_running to prevent cancel requests from |
| 640 | * completing as long as a fixup worker is running. we must also |
| 641 | * increment scrubs_paused to prevent deadlocking on pause |
| 642 | * requests used for transactions commits (as the worker uses a |
| 643 | * transaction context). it is safe to regard the fixup worker |
| 644 | * as paused for all matters practical. effectively, we only |
| 645 | * avoid cancellation requests from completing. |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 646 | */ |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 647 | mutex_lock(&fs_info->scrub_lock); |
| 648 | atomic_inc(&fs_info->scrubs_running); |
| 649 | atomic_inc(&fs_info->scrubs_paused); |
| 650 | mutex_unlock(&fs_info->scrub_lock); |
| 651 | atomic_inc(&sdev->fixup_cnt); |
| 652 | fixup->work.func = scrub_fixup_nodatasum; |
| 653 | btrfs_queue_worker(&fs_info->scrub_workers, &fixup->work); |
| 654 | return; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 655 | } |
| 656 | |
| 657 | length = PAGE_SIZE; |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 658 | ret = btrfs_map_block(map_tree, REQ_WRITE, logical, &length, |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 659 | &bbio, 0); |
| 660 | if (ret || !bbio || length < PAGE_SIZE) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 661 | printk(KERN_ERR |
| 662 | "scrub_fixup: btrfs_map_block failed us for %llu\n", |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 663 | (unsigned long long)logical); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 664 | WARN_ON(1); |
Ilya Dryomov | 56d2a48 | 2011-11-04 09:41:02 -0400 | [diff] [blame] | 665 | kfree(bbio); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 666 | return; |
| 667 | } |
| 668 | |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 669 | if (bbio->num_stripes == 1) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 670 | /* there aren't any replicas */ |
| 671 | goto uncorrectable; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 672 | |
| 673 | /* |
| 674 | * first find a good copy |
| 675 | */ |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 676 | for (i = 0; i < bbio->num_stripes; ++i) { |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 677 | if (i + 1 == sbio->spag[ix].mirror_num) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 678 | continue; |
| 679 | |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 680 | if (scrub_fixup_io(READ, bbio->stripes[i].dev->bdev, |
| 681 | bbio->stripes[i].physical >> 9, |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 682 | sbio->bio->bi_io_vec[ix].bv_page)) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 683 | /* I/O-error, this is not a good copy */ |
| 684 | continue; |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 685 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 686 | |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 687 | if (scrub_fixup_check(sbio, ix) == 0) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 688 | break; |
| 689 | } |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 690 | if (i == bbio->num_stripes) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 691 | goto uncorrectable; |
| 692 | |
Arne Jansen | 8628764 | 2011-03-23 16:34:19 +0100 | [diff] [blame] | 693 | if (!sdev->readonly) { |
| 694 | /* |
| 695 | * bi_io_vec[ix].bv_page now contains good data, write it back |
| 696 | */ |
| 697 | if (scrub_fixup_io(WRITE, sdev->dev->bdev, |
| 698 | (sbio->physical + ix * PAGE_SIZE) >> 9, |
| 699 | sbio->bio->bi_io_vec[ix].bv_page)) { |
| 700 | /* I/O-error, writeback failed, give up */ |
| 701 | goto uncorrectable; |
| 702 | } |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 703 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 704 | |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 705 | kfree(bbio); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 706 | spin_lock(&sdev->stat_lock); |
| 707 | ++sdev->stat.corrected_errors; |
| 708 | spin_unlock(&sdev->stat_lock); |
| 709 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 710 | printk_ratelimited(KERN_ERR "btrfs: fixed up error at logical %llu\n", |
| 711 | (unsigned long long)logical); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 712 | return; |
| 713 | |
| 714 | uncorrectable: |
Jan Schmidt | a1d3c47 | 2011-08-04 17:15:33 +0200 | [diff] [blame] | 715 | kfree(bbio); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 716 | spin_lock(&sdev->stat_lock); |
| 717 | ++sdev->stat.uncorrectable_errors; |
| 718 | spin_unlock(&sdev->stat_lock); |
| 719 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 720 | printk_ratelimited(KERN_ERR "btrfs: unable to fixup (regular) error at " |
| 721 | "logical %llu\n", (unsigned long long)logical); |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 722 | } |
| 723 | |
| 724 | static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector, |
| 725 | struct page *page) |
| 726 | { |
| 727 | struct bio *bio = NULL; |
| 728 | int ret; |
| 729 | DECLARE_COMPLETION_ONSTACK(complete); |
| 730 | |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 731 | bio = bio_alloc(GFP_NOFS, 1); |
| 732 | bio->bi_bdev = bdev; |
| 733 | bio->bi_sector = sector; |
| 734 | bio_add_page(bio, page, PAGE_SIZE, 0); |
| 735 | bio->bi_end_io = scrub_fixup_end_io; |
| 736 | bio->bi_private = &complete; |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 737 | btrfsic_submit_bio(rw, bio); |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 738 | |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 739 | /* this will also unplug the queue */ |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 740 | wait_for_completion(&complete); |
| 741 | |
| 742 | ret = !test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 743 | bio_put(bio); |
| 744 | return ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 745 | } |
| 746 | |
| 747 | static void scrub_bio_end_io(struct bio *bio, int err) |
| 748 | { |
| 749 | struct scrub_bio *sbio = bio->bi_private; |
| 750 | struct scrub_dev *sdev = sbio->sdev; |
| 751 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; |
| 752 | |
| 753 | sbio->err = err; |
Arne Jansen | 1bc8779 | 2011-05-28 21:57:55 +0200 | [diff] [blame] | 754 | sbio->bio = bio; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 755 | |
| 756 | btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work); |
| 757 | } |
| 758 | |
| 759 | static void scrub_checksum(struct btrfs_work *work) |
| 760 | { |
| 761 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); |
| 762 | struct scrub_dev *sdev = sbio->sdev; |
| 763 | struct page *page; |
| 764 | void *buffer; |
| 765 | int i; |
| 766 | u64 flags; |
| 767 | u64 logical; |
| 768 | int ret; |
| 769 | |
| 770 | if (sbio->err) { |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 771 | ret = 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 772 | for (i = 0; i < sbio->count; ++i) |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 773 | ret |= scrub_recheck_error(sbio, i); |
| 774 | if (!ret) { |
| 775 | spin_lock(&sdev->stat_lock); |
| 776 | ++sdev->stat.unverified_errors; |
| 777 | spin_unlock(&sdev->stat_lock); |
| 778 | } |
Ilya Dryomov | 96e3692 | 2011-04-09 14:27:01 +0300 | [diff] [blame] | 779 | |
| 780 | sbio->bio->bi_flags &= ~(BIO_POOL_MASK - 1); |
| 781 | sbio->bio->bi_flags |= 1 << BIO_UPTODATE; |
| 782 | sbio->bio->bi_phys_segments = 0; |
| 783 | sbio->bio->bi_idx = 0; |
| 784 | |
| 785 | for (i = 0; i < sbio->count; i++) { |
| 786 | struct bio_vec *bi; |
| 787 | bi = &sbio->bio->bi_io_vec[i]; |
| 788 | bi->bv_offset = 0; |
| 789 | bi->bv_len = PAGE_SIZE; |
| 790 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 791 | goto out; |
| 792 | } |
| 793 | for (i = 0; i < sbio->count; ++i) { |
| 794 | page = sbio->bio->bi_io_vec[i].bv_page; |
| 795 | buffer = kmap_atomic(page, KM_USER0); |
| 796 | flags = sbio->spag[i].flags; |
| 797 | logical = sbio->logical + i * PAGE_SIZE; |
| 798 | ret = 0; |
| 799 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
| 800 | ret = scrub_checksum_data(sdev, sbio->spag + i, buffer); |
| 801 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
| 802 | ret = scrub_checksum_tree_block(sdev, sbio->spag + i, |
| 803 | logical, buffer); |
| 804 | } else if (flags & BTRFS_EXTENT_FLAG_SUPER) { |
| 805 | BUG_ON(i); |
| 806 | (void)scrub_checksum_super(sbio, buffer); |
| 807 | } else { |
| 808 | WARN_ON(1); |
| 809 | } |
| 810 | kunmap_atomic(buffer, KM_USER0); |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 811 | if (ret) { |
| 812 | ret = scrub_recheck_error(sbio, i); |
| 813 | if (!ret) { |
| 814 | spin_lock(&sdev->stat_lock); |
| 815 | ++sdev->stat.unverified_errors; |
| 816 | spin_unlock(&sdev->stat_lock); |
| 817 | } |
| 818 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 819 | } |
| 820 | |
| 821 | out: |
Arne Jansen | 1bc8779 | 2011-05-28 21:57:55 +0200 | [diff] [blame] | 822 | scrub_free_bio(sbio->bio); |
| 823 | sbio->bio = NULL; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 824 | spin_lock(&sdev->list_lock); |
| 825 | sbio->next_free = sdev->first_free; |
| 826 | sdev->first_free = sbio->index; |
| 827 | spin_unlock(&sdev->list_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 828 | atomic_dec(&sdev->in_flight); |
| 829 | wake_up(&sdev->list_wait); |
| 830 | } |
| 831 | |
| 832 | static int scrub_checksum_data(struct scrub_dev *sdev, |
| 833 | struct scrub_page *spag, void *buffer) |
| 834 | { |
| 835 | u8 csum[BTRFS_CSUM_SIZE]; |
| 836 | u32 crc = ~(u32)0; |
| 837 | int fail = 0; |
| 838 | struct btrfs_root *root = sdev->dev->dev_root; |
| 839 | |
| 840 | if (!spag->have_csum) |
| 841 | return 0; |
| 842 | |
| 843 | crc = btrfs_csum_data(root, buffer, crc, PAGE_SIZE); |
| 844 | btrfs_csum_final(crc, csum); |
| 845 | if (memcmp(csum, spag->csum, sdev->csum_size)) |
| 846 | fail = 1; |
| 847 | |
| 848 | spin_lock(&sdev->stat_lock); |
| 849 | ++sdev->stat.data_extents_scrubbed; |
| 850 | sdev->stat.data_bytes_scrubbed += PAGE_SIZE; |
| 851 | if (fail) |
| 852 | ++sdev->stat.csum_errors; |
| 853 | spin_unlock(&sdev->stat_lock); |
| 854 | |
| 855 | return fail; |
| 856 | } |
| 857 | |
| 858 | static int scrub_checksum_tree_block(struct scrub_dev *sdev, |
| 859 | struct scrub_page *spag, u64 logical, |
| 860 | void *buffer) |
| 861 | { |
| 862 | struct btrfs_header *h; |
| 863 | struct btrfs_root *root = sdev->dev->dev_root; |
| 864 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 865 | u8 csum[BTRFS_CSUM_SIZE]; |
| 866 | u32 crc = ~(u32)0; |
| 867 | int fail = 0; |
| 868 | int crc_fail = 0; |
| 869 | |
| 870 | /* |
| 871 | * we don't use the getter functions here, as we |
| 872 | * a) don't have an extent buffer and |
| 873 | * b) the page is already kmapped |
| 874 | */ |
| 875 | h = (struct btrfs_header *)buffer; |
| 876 | |
| 877 | if (logical != le64_to_cpu(h->bytenr)) |
| 878 | ++fail; |
| 879 | |
| 880 | if (spag->generation != le64_to_cpu(h->generation)) |
| 881 | ++fail; |
| 882 | |
| 883 | if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) |
| 884 | ++fail; |
| 885 | |
| 886 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
| 887 | BTRFS_UUID_SIZE)) |
| 888 | ++fail; |
| 889 | |
| 890 | crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc, |
| 891 | PAGE_SIZE - BTRFS_CSUM_SIZE); |
| 892 | btrfs_csum_final(crc, csum); |
| 893 | if (memcmp(csum, h->csum, sdev->csum_size)) |
| 894 | ++crc_fail; |
| 895 | |
| 896 | spin_lock(&sdev->stat_lock); |
| 897 | ++sdev->stat.tree_extents_scrubbed; |
| 898 | sdev->stat.tree_bytes_scrubbed += PAGE_SIZE; |
| 899 | if (crc_fail) |
| 900 | ++sdev->stat.csum_errors; |
| 901 | if (fail) |
| 902 | ++sdev->stat.verify_errors; |
| 903 | spin_unlock(&sdev->stat_lock); |
| 904 | |
| 905 | return fail || crc_fail; |
| 906 | } |
| 907 | |
| 908 | static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer) |
| 909 | { |
| 910 | struct btrfs_super_block *s; |
| 911 | u64 logical; |
| 912 | struct scrub_dev *sdev = sbio->sdev; |
| 913 | struct btrfs_root *root = sdev->dev->dev_root; |
| 914 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 915 | u8 csum[BTRFS_CSUM_SIZE]; |
| 916 | u32 crc = ~(u32)0; |
| 917 | int fail = 0; |
| 918 | |
| 919 | s = (struct btrfs_super_block *)buffer; |
| 920 | logical = sbio->logical; |
| 921 | |
| 922 | if (logical != le64_to_cpu(s->bytenr)) |
| 923 | ++fail; |
| 924 | |
| 925 | if (sbio->spag[0].generation != le64_to_cpu(s->generation)) |
| 926 | ++fail; |
| 927 | |
| 928 | if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) |
| 929 | ++fail; |
| 930 | |
| 931 | crc = btrfs_csum_data(root, buffer + BTRFS_CSUM_SIZE, crc, |
| 932 | PAGE_SIZE - BTRFS_CSUM_SIZE); |
| 933 | btrfs_csum_final(crc, csum); |
| 934 | if (memcmp(csum, s->csum, sbio->sdev->csum_size)) |
| 935 | ++fail; |
| 936 | |
| 937 | if (fail) { |
| 938 | /* |
| 939 | * if we find an error in a super block, we just report it. |
| 940 | * They will get written with the next transaction commit |
| 941 | * anyway |
| 942 | */ |
| 943 | spin_lock(&sdev->stat_lock); |
| 944 | ++sdev->stat.super_errors; |
| 945 | spin_unlock(&sdev->stat_lock); |
| 946 | } |
| 947 | |
| 948 | return fail; |
| 949 | } |
| 950 | |
| 951 | static int scrub_submit(struct scrub_dev *sdev) |
| 952 | { |
| 953 | struct scrub_bio *sbio; |
| 954 | |
| 955 | if (sdev->curr == -1) |
| 956 | return 0; |
| 957 | |
| 958 | sbio = sdev->bios[sdev->curr]; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 959 | sbio->err = 0; |
| 960 | sdev->curr = -1; |
| 961 | atomic_inc(&sdev->in_flight); |
| 962 | |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 963 | btrfsic_submit_bio(READ, sbio->bio); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 964 | |
| 965 | return 0; |
| 966 | } |
| 967 | |
| 968 | static int scrub_page(struct scrub_dev *sdev, u64 logical, u64 len, |
Jan Schmidt | e12fa9c | 2011-06-17 15:55:21 +0200 | [diff] [blame] | 969 | u64 physical, u64 flags, u64 gen, int mirror_num, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 970 | u8 *csum, int force) |
| 971 | { |
| 972 | struct scrub_bio *sbio; |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 973 | struct page *page; |
| 974 | int ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 975 | |
| 976 | again: |
| 977 | /* |
| 978 | * grab a fresh bio or wait for one to become available |
| 979 | */ |
| 980 | while (sdev->curr == -1) { |
| 981 | spin_lock(&sdev->list_lock); |
| 982 | sdev->curr = sdev->first_free; |
| 983 | if (sdev->curr != -1) { |
| 984 | sdev->first_free = sdev->bios[sdev->curr]->next_free; |
| 985 | sdev->bios[sdev->curr]->next_free = -1; |
| 986 | sdev->bios[sdev->curr]->count = 0; |
| 987 | spin_unlock(&sdev->list_lock); |
| 988 | } else { |
| 989 | spin_unlock(&sdev->list_lock); |
| 990 | wait_event(sdev->list_wait, sdev->first_free != -1); |
| 991 | } |
| 992 | } |
| 993 | sbio = sdev->bios[sdev->curr]; |
| 994 | if (sbio->count == 0) { |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 995 | struct bio *bio; |
| 996 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 997 | sbio->physical = physical; |
| 998 | sbio->logical = logical; |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 999 | bio = bio_alloc(GFP_NOFS, SCRUB_PAGES_PER_BIO); |
| 1000 | if (!bio) |
| 1001 | return -ENOMEM; |
| 1002 | |
| 1003 | bio->bi_private = sbio; |
| 1004 | bio->bi_end_io = scrub_bio_end_io; |
| 1005 | bio->bi_bdev = sdev->dev->bdev; |
| 1006 | bio->bi_sector = sbio->physical >> 9; |
| 1007 | sbio->err = 0; |
| 1008 | sbio->bio = bio; |
Arne Jansen | 00d01bc | 2011-05-25 12:22:50 +0000 | [diff] [blame] | 1009 | } else if (sbio->physical + sbio->count * PAGE_SIZE != physical || |
| 1010 | sbio->logical + sbio->count * PAGE_SIZE != logical) { |
Arne Jansen | 1bc8779 | 2011-05-28 21:57:55 +0200 | [diff] [blame] | 1011 | ret = scrub_submit(sdev); |
| 1012 | if (ret) |
| 1013 | return ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1014 | goto again; |
| 1015 | } |
| 1016 | sbio->spag[sbio->count].flags = flags; |
| 1017 | sbio->spag[sbio->count].generation = gen; |
| 1018 | sbio->spag[sbio->count].have_csum = 0; |
| 1019 | sbio->spag[sbio->count].mirror_num = mirror_num; |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1020 | |
| 1021 | page = alloc_page(GFP_NOFS); |
| 1022 | if (!page) |
| 1023 | return -ENOMEM; |
| 1024 | |
| 1025 | ret = bio_add_page(sbio->bio, page, PAGE_SIZE, 0); |
| 1026 | if (!ret) { |
| 1027 | __free_page(page); |
| 1028 | ret = scrub_submit(sdev); |
| 1029 | if (ret) |
| 1030 | return ret; |
| 1031 | goto again; |
| 1032 | } |
| 1033 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1034 | if (csum) { |
| 1035 | sbio->spag[sbio->count].have_csum = 1; |
| 1036 | memcpy(sbio->spag[sbio->count].csum, csum, sdev->csum_size); |
| 1037 | } |
| 1038 | ++sbio->count; |
Arne Jansen | 1bc8779 | 2011-05-28 21:57:55 +0200 | [diff] [blame] | 1039 | if (sbio->count == SCRUB_PAGES_PER_BIO || force) { |
| 1040 | int ret; |
| 1041 | |
| 1042 | ret = scrub_submit(sdev); |
| 1043 | if (ret) |
| 1044 | return ret; |
| 1045 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1046 | |
| 1047 | return 0; |
| 1048 | } |
| 1049 | |
| 1050 | static int scrub_find_csum(struct scrub_dev *sdev, u64 logical, u64 len, |
| 1051 | u8 *csum) |
| 1052 | { |
| 1053 | struct btrfs_ordered_sum *sum = NULL; |
| 1054 | int ret = 0; |
| 1055 | unsigned long i; |
| 1056 | unsigned long num_sectors; |
| 1057 | u32 sectorsize = sdev->dev->dev_root->sectorsize; |
| 1058 | |
| 1059 | while (!list_empty(&sdev->csum_list)) { |
| 1060 | sum = list_first_entry(&sdev->csum_list, |
| 1061 | struct btrfs_ordered_sum, list); |
| 1062 | if (sum->bytenr > logical) |
| 1063 | return 0; |
| 1064 | if (sum->bytenr + sum->len > logical) |
| 1065 | break; |
| 1066 | |
| 1067 | ++sdev->stat.csum_discards; |
| 1068 | list_del(&sum->list); |
| 1069 | kfree(sum); |
| 1070 | sum = NULL; |
| 1071 | } |
| 1072 | if (!sum) |
| 1073 | return 0; |
| 1074 | |
| 1075 | num_sectors = sum->len / sectorsize; |
| 1076 | for (i = 0; i < num_sectors; ++i) { |
| 1077 | if (sum->sums[i].bytenr == logical) { |
| 1078 | memcpy(csum, &sum->sums[i].sum, sdev->csum_size); |
| 1079 | ret = 1; |
| 1080 | break; |
| 1081 | } |
| 1082 | } |
| 1083 | if (ret && i == num_sectors - 1) { |
| 1084 | list_del(&sum->list); |
| 1085 | kfree(sum); |
| 1086 | } |
| 1087 | return ret; |
| 1088 | } |
| 1089 | |
| 1090 | /* scrub extent tries to collect up to 64 kB for each bio */ |
| 1091 | static int scrub_extent(struct scrub_dev *sdev, u64 logical, u64 len, |
Jan Schmidt | e12fa9c | 2011-06-17 15:55:21 +0200 | [diff] [blame] | 1092 | u64 physical, u64 flags, u64 gen, int mirror_num) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1093 | { |
| 1094 | int ret; |
| 1095 | u8 csum[BTRFS_CSUM_SIZE]; |
| 1096 | |
| 1097 | while (len) { |
| 1098 | u64 l = min_t(u64, len, PAGE_SIZE); |
| 1099 | int have_csum = 0; |
| 1100 | |
| 1101 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
| 1102 | /* push csums to sbio */ |
| 1103 | have_csum = scrub_find_csum(sdev, logical, l, csum); |
| 1104 | if (have_csum == 0) |
| 1105 | ++sdev->stat.no_csum; |
| 1106 | } |
| 1107 | ret = scrub_page(sdev, logical, l, physical, flags, gen, |
| 1108 | mirror_num, have_csum ? csum : NULL, 0); |
| 1109 | if (ret) |
| 1110 | return ret; |
| 1111 | len -= l; |
| 1112 | logical += l; |
| 1113 | physical += l; |
| 1114 | } |
| 1115 | return 0; |
| 1116 | } |
| 1117 | |
| 1118 | static noinline_for_stack int scrub_stripe(struct scrub_dev *sdev, |
| 1119 | struct map_lookup *map, int num, u64 base, u64 length) |
| 1120 | { |
| 1121 | struct btrfs_path *path; |
| 1122 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; |
| 1123 | struct btrfs_root *root = fs_info->extent_root; |
| 1124 | struct btrfs_root *csum_root = fs_info->csum_root; |
| 1125 | struct btrfs_extent_item *extent; |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 1126 | struct blk_plug plug; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1127 | u64 flags; |
| 1128 | int ret; |
| 1129 | int slot; |
| 1130 | int i; |
| 1131 | u64 nstripes; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1132 | struct extent_buffer *l; |
| 1133 | struct btrfs_key key; |
| 1134 | u64 physical; |
| 1135 | u64 logical; |
| 1136 | u64 generation; |
Jan Schmidt | e12fa9c | 2011-06-17 15:55:21 +0200 | [diff] [blame] | 1137 | int mirror_num; |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1138 | struct reada_control *reada1; |
| 1139 | struct reada_control *reada2; |
| 1140 | struct btrfs_key key_start; |
| 1141 | struct btrfs_key key_end; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1142 | |
| 1143 | u64 increment = map->stripe_len; |
| 1144 | u64 offset; |
| 1145 | |
| 1146 | nstripes = length; |
| 1147 | offset = 0; |
| 1148 | do_div(nstripes, map->stripe_len); |
| 1149 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
| 1150 | offset = map->stripe_len * num; |
| 1151 | increment = map->stripe_len * map->num_stripes; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1152 | mirror_num = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1153 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
| 1154 | int factor = map->num_stripes / map->sub_stripes; |
| 1155 | offset = map->stripe_len * (num / map->sub_stripes); |
| 1156 | increment = map->stripe_len * factor; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1157 | mirror_num = num % map->sub_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1158 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
| 1159 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1160 | mirror_num = num % map->num_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1161 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
| 1162 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1163 | mirror_num = num % map->num_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1164 | } else { |
| 1165 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1166 | mirror_num = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1167 | } |
| 1168 | |
| 1169 | path = btrfs_alloc_path(); |
| 1170 | if (!path) |
| 1171 | return -ENOMEM; |
| 1172 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1173 | path->search_commit_root = 1; |
| 1174 | path->skip_locking = 1; |
| 1175 | |
| 1176 | /* |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1177 | * trigger the readahead for extent tree csum tree and wait for |
| 1178 | * completion. During readahead, the scrub is officially paused |
| 1179 | * to not hold off transaction commits |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1180 | */ |
| 1181 | logical = base + offset; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1182 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1183 | wait_event(sdev->list_wait, |
| 1184 | atomic_read(&sdev->in_flight) == 0); |
| 1185 | atomic_inc(&fs_info->scrubs_paused); |
| 1186 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1187 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1188 | /* FIXME it might be better to start readahead at commit root */ |
| 1189 | key_start.objectid = logical; |
| 1190 | key_start.type = BTRFS_EXTENT_ITEM_KEY; |
| 1191 | key_start.offset = (u64)0; |
| 1192 | key_end.objectid = base + offset + nstripes * increment; |
| 1193 | key_end.type = BTRFS_EXTENT_ITEM_KEY; |
| 1194 | key_end.offset = (u64)0; |
| 1195 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1196 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1197 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 1198 | key_start.type = BTRFS_EXTENT_CSUM_KEY; |
| 1199 | key_start.offset = logical; |
| 1200 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 1201 | key_end.type = BTRFS_EXTENT_CSUM_KEY; |
| 1202 | key_end.offset = base + offset + nstripes * increment; |
| 1203 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1204 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1205 | if (!IS_ERR(reada1)) |
| 1206 | btrfs_reada_wait(reada1); |
| 1207 | if (!IS_ERR(reada2)) |
| 1208 | btrfs_reada_wait(reada2); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1209 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1210 | mutex_lock(&fs_info->scrub_lock); |
| 1211 | while (atomic_read(&fs_info->scrub_pause_req)) { |
| 1212 | mutex_unlock(&fs_info->scrub_lock); |
| 1213 | wait_event(fs_info->scrub_pause_wait, |
| 1214 | atomic_read(&fs_info->scrub_pause_req) == 0); |
| 1215 | mutex_lock(&fs_info->scrub_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1216 | } |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1217 | atomic_dec(&fs_info->scrubs_paused); |
| 1218 | mutex_unlock(&fs_info->scrub_lock); |
| 1219 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1220 | |
| 1221 | /* |
| 1222 | * collect all data csums for the stripe to avoid seeking during |
| 1223 | * the scrub. This might currently (crc32) end up to be about 1MB |
| 1224 | */ |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 1225 | blk_start_plug(&plug); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1226 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1227 | /* |
| 1228 | * now find all extents for each stripe and scrub them |
| 1229 | */ |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1230 | logical = base + offset; |
| 1231 | physical = map->stripes[num].physical; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1232 | ret = 0; |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1233 | for (i = 0; i < nstripes; ++i) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1234 | /* |
| 1235 | * canceled? |
| 1236 | */ |
| 1237 | if (atomic_read(&fs_info->scrub_cancel_req) || |
| 1238 | atomic_read(&sdev->cancel_req)) { |
| 1239 | ret = -ECANCELED; |
| 1240 | goto out; |
| 1241 | } |
| 1242 | /* |
| 1243 | * check to see if we have to pause |
| 1244 | */ |
| 1245 | if (atomic_read(&fs_info->scrub_pause_req)) { |
| 1246 | /* push queued extents */ |
| 1247 | scrub_submit(sdev); |
| 1248 | wait_event(sdev->list_wait, |
| 1249 | atomic_read(&sdev->in_flight) == 0); |
| 1250 | atomic_inc(&fs_info->scrubs_paused); |
| 1251 | wake_up(&fs_info->scrub_pause_wait); |
| 1252 | mutex_lock(&fs_info->scrub_lock); |
| 1253 | while (atomic_read(&fs_info->scrub_pause_req)) { |
| 1254 | mutex_unlock(&fs_info->scrub_lock); |
| 1255 | wait_event(fs_info->scrub_pause_wait, |
| 1256 | atomic_read(&fs_info->scrub_pause_req) == 0); |
| 1257 | mutex_lock(&fs_info->scrub_lock); |
| 1258 | } |
| 1259 | atomic_dec(&fs_info->scrubs_paused); |
| 1260 | mutex_unlock(&fs_info->scrub_lock); |
| 1261 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1262 | } |
| 1263 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1264 | ret = btrfs_lookup_csums_range(csum_root, logical, |
| 1265 | logical + map->stripe_len - 1, |
| 1266 | &sdev->csum_list, 1); |
| 1267 | if (ret) |
| 1268 | goto out; |
| 1269 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1270 | key.objectid = logical; |
| 1271 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 1272 | key.offset = (u64)0; |
| 1273 | |
| 1274 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 1275 | if (ret < 0) |
| 1276 | goto out; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 1277 | if (ret > 0) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1278 | ret = btrfs_previous_item(root, path, 0, |
| 1279 | BTRFS_EXTENT_ITEM_KEY); |
| 1280 | if (ret < 0) |
| 1281 | goto out; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 1282 | if (ret > 0) { |
| 1283 | /* there's no smaller item, so stick with the |
| 1284 | * larger one */ |
| 1285 | btrfs_release_path(path); |
| 1286 | ret = btrfs_search_slot(NULL, root, &key, |
| 1287 | path, 0, 0); |
| 1288 | if (ret < 0) |
| 1289 | goto out; |
| 1290 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1291 | } |
| 1292 | |
| 1293 | while (1) { |
| 1294 | l = path->nodes[0]; |
| 1295 | slot = path->slots[0]; |
| 1296 | if (slot >= btrfs_header_nritems(l)) { |
| 1297 | ret = btrfs_next_leaf(root, path); |
| 1298 | if (ret == 0) |
| 1299 | continue; |
| 1300 | if (ret < 0) |
| 1301 | goto out; |
| 1302 | |
| 1303 | break; |
| 1304 | } |
| 1305 | btrfs_item_key_to_cpu(l, &key, slot); |
| 1306 | |
| 1307 | if (key.objectid + key.offset <= logical) |
| 1308 | goto next; |
| 1309 | |
| 1310 | if (key.objectid >= logical + map->stripe_len) |
| 1311 | break; |
| 1312 | |
| 1313 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) |
| 1314 | goto next; |
| 1315 | |
| 1316 | extent = btrfs_item_ptr(l, slot, |
| 1317 | struct btrfs_extent_item); |
| 1318 | flags = btrfs_extent_flags(l, extent); |
| 1319 | generation = btrfs_extent_generation(l, extent); |
| 1320 | |
| 1321 | if (key.objectid < logical && |
| 1322 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { |
| 1323 | printk(KERN_ERR |
| 1324 | "btrfs scrub: tree block %llu spanning " |
| 1325 | "stripes, ignored. logical=%llu\n", |
| 1326 | (unsigned long long)key.objectid, |
| 1327 | (unsigned long long)logical); |
| 1328 | goto next; |
| 1329 | } |
| 1330 | |
| 1331 | /* |
| 1332 | * trim extent to this stripe |
| 1333 | */ |
| 1334 | if (key.objectid < logical) { |
| 1335 | key.offset -= logical - key.objectid; |
| 1336 | key.objectid = logical; |
| 1337 | } |
| 1338 | if (key.objectid + key.offset > |
| 1339 | logical + map->stripe_len) { |
| 1340 | key.offset = logical + map->stripe_len - |
| 1341 | key.objectid; |
| 1342 | } |
| 1343 | |
| 1344 | ret = scrub_extent(sdev, key.objectid, key.offset, |
| 1345 | key.objectid - logical + physical, |
| 1346 | flags, generation, mirror_num); |
| 1347 | if (ret) |
| 1348 | goto out; |
| 1349 | |
| 1350 | next: |
| 1351 | path->slots[0]++; |
| 1352 | } |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 1353 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1354 | logical += increment; |
| 1355 | physical += map->stripe_len; |
| 1356 | spin_lock(&sdev->stat_lock); |
| 1357 | sdev->stat.last_physical = physical; |
| 1358 | spin_unlock(&sdev->stat_lock); |
| 1359 | } |
| 1360 | /* push queued extents */ |
| 1361 | scrub_submit(sdev); |
| 1362 | |
| 1363 | out: |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 1364 | blk_finish_plug(&plug); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1365 | btrfs_free_path(path); |
| 1366 | return ret < 0 ? ret : 0; |
| 1367 | } |
| 1368 | |
| 1369 | static noinline_for_stack int scrub_chunk(struct scrub_dev *sdev, |
Arne Jansen | 859acaf | 2012-02-09 15:09:02 +0100 | [diff] [blame^] | 1370 | u64 chunk_tree, u64 chunk_objectid, u64 chunk_offset, u64 length, |
| 1371 | u64 dev_offset) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1372 | { |
| 1373 | struct btrfs_mapping_tree *map_tree = |
| 1374 | &sdev->dev->dev_root->fs_info->mapping_tree; |
| 1375 | struct map_lookup *map; |
| 1376 | struct extent_map *em; |
| 1377 | int i; |
| 1378 | int ret = -EINVAL; |
| 1379 | |
| 1380 | read_lock(&map_tree->map_tree.lock); |
| 1381 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
| 1382 | read_unlock(&map_tree->map_tree.lock); |
| 1383 | |
| 1384 | if (!em) |
| 1385 | return -EINVAL; |
| 1386 | |
| 1387 | map = (struct map_lookup *)em->bdev; |
| 1388 | if (em->start != chunk_offset) |
| 1389 | goto out; |
| 1390 | |
| 1391 | if (em->len < length) |
| 1392 | goto out; |
| 1393 | |
| 1394 | for (i = 0; i < map->num_stripes; ++i) { |
Arne Jansen | 859acaf | 2012-02-09 15:09:02 +0100 | [diff] [blame^] | 1395 | if (map->stripes[i].dev == sdev->dev && |
| 1396 | map->stripes[i].physical == dev_offset) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1397 | ret = scrub_stripe(sdev, map, i, chunk_offset, length); |
| 1398 | if (ret) |
| 1399 | goto out; |
| 1400 | } |
| 1401 | } |
| 1402 | out: |
| 1403 | free_extent_map(em); |
| 1404 | |
| 1405 | return ret; |
| 1406 | } |
| 1407 | |
| 1408 | static noinline_for_stack |
| 1409 | int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end) |
| 1410 | { |
| 1411 | struct btrfs_dev_extent *dev_extent = NULL; |
| 1412 | struct btrfs_path *path; |
| 1413 | struct btrfs_root *root = sdev->dev->dev_root; |
| 1414 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1415 | u64 length; |
| 1416 | u64 chunk_tree; |
| 1417 | u64 chunk_objectid; |
| 1418 | u64 chunk_offset; |
| 1419 | int ret; |
| 1420 | int slot; |
| 1421 | struct extent_buffer *l; |
| 1422 | struct btrfs_key key; |
| 1423 | struct btrfs_key found_key; |
| 1424 | struct btrfs_block_group_cache *cache; |
| 1425 | |
| 1426 | path = btrfs_alloc_path(); |
| 1427 | if (!path) |
| 1428 | return -ENOMEM; |
| 1429 | |
| 1430 | path->reada = 2; |
| 1431 | path->search_commit_root = 1; |
| 1432 | path->skip_locking = 1; |
| 1433 | |
| 1434 | key.objectid = sdev->dev->devid; |
| 1435 | key.offset = 0ull; |
| 1436 | key.type = BTRFS_DEV_EXTENT_KEY; |
| 1437 | |
| 1438 | |
| 1439 | while (1) { |
| 1440 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 1441 | if (ret < 0) |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 1442 | break; |
| 1443 | if (ret > 0) { |
| 1444 | if (path->slots[0] >= |
| 1445 | btrfs_header_nritems(path->nodes[0])) { |
| 1446 | ret = btrfs_next_leaf(root, path); |
| 1447 | if (ret) |
| 1448 | break; |
| 1449 | } |
| 1450 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1451 | |
| 1452 | l = path->nodes[0]; |
| 1453 | slot = path->slots[0]; |
| 1454 | |
| 1455 | btrfs_item_key_to_cpu(l, &found_key, slot); |
| 1456 | |
| 1457 | if (found_key.objectid != sdev->dev->devid) |
| 1458 | break; |
| 1459 | |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 1460 | if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1461 | break; |
| 1462 | |
| 1463 | if (found_key.offset >= end) |
| 1464 | break; |
| 1465 | |
| 1466 | if (found_key.offset < key.offset) |
| 1467 | break; |
| 1468 | |
| 1469 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
| 1470 | length = btrfs_dev_extent_length(l, dev_extent); |
| 1471 | |
| 1472 | if (found_key.offset + length <= start) { |
| 1473 | key.offset = found_key.offset + length; |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 1474 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1475 | continue; |
| 1476 | } |
| 1477 | |
| 1478 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); |
| 1479 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); |
| 1480 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
| 1481 | |
| 1482 | /* |
| 1483 | * get a reference on the corresponding block group to prevent |
| 1484 | * the chunk from going away while we scrub it |
| 1485 | */ |
| 1486 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); |
| 1487 | if (!cache) { |
| 1488 | ret = -ENOENT; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 1489 | break; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1490 | } |
| 1491 | ret = scrub_chunk(sdev, chunk_tree, chunk_objectid, |
Arne Jansen | 859acaf | 2012-02-09 15:09:02 +0100 | [diff] [blame^] | 1492 | chunk_offset, length, found_key.offset); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1493 | btrfs_put_block_group(cache); |
| 1494 | if (ret) |
| 1495 | break; |
| 1496 | |
| 1497 | key.offset = found_key.offset + length; |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 1498 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1499 | } |
| 1500 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1501 | btrfs_free_path(path); |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 1502 | |
| 1503 | /* |
| 1504 | * ret can still be 1 from search_slot or next_leaf, |
| 1505 | * that's not an error |
| 1506 | */ |
| 1507 | return ret < 0 ? ret : 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1508 | } |
| 1509 | |
| 1510 | static noinline_for_stack int scrub_supers(struct scrub_dev *sdev) |
| 1511 | { |
| 1512 | int i; |
| 1513 | u64 bytenr; |
| 1514 | u64 gen; |
| 1515 | int ret; |
| 1516 | struct btrfs_device *device = sdev->dev; |
| 1517 | struct btrfs_root *root = device->dev_root; |
| 1518 | |
| 1519 | gen = root->fs_info->last_trans_committed; |
| 1520 | |
| 1521 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| 1522 | bytenr = btrfs_sb_offset(i); |
| 1523 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) |
| 1524 | break; |
| 1525 | |
| 1526 | ret = scrub_page(sdev, bytenr, PAGE_SIZE, bytenr, |
| 1527 | BTRFS_EXTENT_FLAG_SUPER, gen, i, NULL, 1); |
| 1528 | if (ret) |
| 1529 | return ret; |
| 1530 | } |
| 1531 | wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0); |
| 1532 | |
| 1533 | return 0; |
| 1534 | } |
| 1535 | |
| 1536 | /* |
| 1537 | * get a reference count on fs_info->scrub_workers. start worker if necessary |
| 1538 | */ |
| 1539 | static noinline_for_stack int scrub_workers_get(struct btrfs_root *root) |
| 1540 | { |
| 1541 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 1542 | int ret = 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1543 | |
| 1544 | mutex_lock(&fs_info->scrub_lock); |
Arne Jansen | 632dd77 | 2011-06-10 12:07:07 +0200 | [diff] [blame] | 1545 | if (fs_info->scrub_workers_refcnt == 0) { |
| 1546 | btrfs_init_workers(&fs_info->scrub_workers, "scrub", |
| 1547 | fs_info->thread_pool_size, &fs_info->generic_worker); |
| 1548 | fs_info->scrub_workers.idle_thresh = 4; |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 1549 | ret = btrfs_start_workers(&fs_info->scrub_workers); |
| 1550 | if (ret) |
| 1551 | goto out; |
Arne Jansen | 632dd77 | 2011-06-10 12:07:07 +0200 | [diff] [blame] | 1552 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1553 | ++fs_info->scrub_workers_refcnt; |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 1554 | out: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1555 | mutex_unlock(&fs_info->scrub_lock); |
| 1556 | |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 1557 | return ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1558 | } |
| 1559 | |
| 1560 | static noinline_for_stack void scrub_workers_put(struct btrfs_root *root) |
| 1561 | { |
| 1562 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1563 | |
| 1564 | mutex_lock(&fs_info->scrub_lock); |
| 1565 | if (--fs_info->scrub_workers_refcnt == 0) |
| 1566 | btrfs_stop_workers(&fs_info->scrub_workers); |
| 1567 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
| 1568 | mutex_unlock(&fs_info->scrub_lock); |
| 1569 | } |
| 1570 | |
| 1571 | |
| 1572 | int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end, |
Arne Jansen | 8628764 | 2011-03-23 16:34:19 +0100 | [diff] [blame] | 1573 | struct btrfs_scrub_progress *progress, int readonly) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1574 | { |
| 1575 | struct scrub_dev *sdev; |
| 1576 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1577 | int ret; |
| 1578 | struct btrfs_device *dev; |
| 1579 | |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 1580 | if (btrfs_fs_closing(root->fs_info)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1581 | return -EINVAL; |
| 1582 | |
| 1583 | /* |
| 1584 | * check some assumptions |
| 1585 | */ |
| 1586 | if (root->sectorsize != PAGE_SIZE || |
| 1587 | root->sectorsize != root->leafsize || |
| 1588 | root->sectorsize != root->nodesize) { |
| 1589 | printk(KERN_ERR "btrfs_scrub: size assumptions fail\n"); |
| 1590 | return -EINVAL; |
| 1591 | } |
| 1592 | |
| 1593 | ret = scrub_workers_get(root); |
| 1594 | if (ret) |
| 1595 | return ret; |
| 1596 | |
| 1597 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
| 1598 | dev = btrfs_find_device(root, devid, NULL, NULL); |
| 1599 | if (!dev || dev->missing) { |
| 1600 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 1601 | scrub_workers_put(root); |
| 1602 | return -ENODEV; |
| 1603 | } |
| 1604 | mutex_lock(&fs_info->scrub_lock); |
| 1605 | |
| 1606 | if (!dev->in_fs_metadata) { |
| 1607 | mutex_unlock(&fs_info->scrub_lock); |
| 1608 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 1609 | scrub_workers_put(root); |
| 1610 | return -ENODEV; |
| 1611 | } |
| 1612 | |
| 1613 | if (dev->scrub_device) { |
| 1614 | mutex_unlock(&fs_info->scrub_lock); |
| 1615 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 1616 | scrub_workers_put(root); |
| 1617 | return -EINPROGRESS; |
| 1618 | } |
| 1619 | sdev = scrub_setup_dev(dev); |
| 1620 | if (IS_ERR(sdev)) { |
| 1621 | mutex_unlock(&fs_info->scrub_lock); |
| 1622 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 1623 | scrub_workers_put(root); |
| 1624 | return PTR_ERR(sdev); |
| 1625 | } |
Arne Jansen | 8628764 | 2011-03-23 16:34:19 +0100 | [diff] [blame] | 1626 | sdev->readonly = readonly; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1627 | dev->scrub_device = sdev; |
| 1628 | |
| 1629 | atomic_inc(&fs_info->scrubs_running); |
| 1630 | mutex_unlock(&fs_info->scrub_lock); |
| 1631 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 1632 | |
| 1633 | down_read(&fs_info->scrub_super_lock); |
| 1634 | ret = scrub_supers(sdev); |
| 1635 | up_read(&fs_info->scrub_super_lock); |
| 1636 | |
| 1637 | if (!ret) |
| 1638 | ret = scrub_enumerate_chunks(sdev, start, end); |
| 1639 | |
| 1640 | wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1641 | atomic_dec(&fs_info->scrubs_running); |
| 1642 | wake_up(&fs_info->scrub_pause_wait); |
| 1643 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 1644 | wait_event(sdev->list_wait, atomic_read(&sdev->fixup_cnt) == 0); |
| 1645 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1646 | if (progress) |
| 1647 | memcpy(progress, &sdev->stat, sizeof(*progress)); |
| 1648 | |
| 1649 | mutex_lock(&fs_info->scrub_lock); |
| 1650 | dev->scrub_device = NULL; |
| 1651 | mutex_unlock(&fs_info->scrub_lock); |
| 1652 | |
| 1653 | scrub_free_dev(sdev); |
| 1654 | scrub_workers_put(root); |
| 1655 | |
| 1656 | return ret; |
| 1657 | } |
| 1658 | |
| 1659 | int btrfs_scrub_pause(struct btrfs_root *root) |
| 1660 | { |
| 1661 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1662 | |
| 1663 | mutex_lock(&fs_info->scrub_lock); |
| 1664 | atomic_inc(&fs_info->scrub_pause_req); |
| 1665 | while (atomic_read(&fs_info->scrubs_paused) != |
| 1666 | atomic_read(&fs_info->scrubs_running)) { |
| 1667 | mutex_unlock(&fs_info->scrub_lock); |
| 1668 | wait_event(fs_info->scrub_pause_wait, |
| 1669 | atomic_read(&fs_info->scrubs_paused) == |
| 1670 | atomic_read(&fs_info->scrubs_running)); |
| 1671 | mutex_lock(&fs_info->scrub_lock); |
| 1672 | } |
| 1673 | mutex_unlock(&fs_info->scrub_lock); |
| 1674 | |
| 1675 | return 0; |
| 1676 | } |
| 1677 | |
| 1678 | int btrfs_scrub_continue(struct btrfs_root *root) |
| 1679 | { |
| 1680 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1681 | |
| 1682 | atomic_dec(&fs_info->scrub_pause_req); |
| 1683 | wake_up(&fs_info->scrub_pause_wait); |
| 1684 | return 0; |
| 1685 | } |
| 1686 | |
| 1687 | int btrfs_scrub_pause_super(struct btrfs_root *root) |
| 1688 | { |
| 1689 | down_write(&root->fs_info->scrub_super_lock); |
| 1690 | return 0; |
| 1691 | } |
| 1692 | |
| 1693 | int btrfs_scrub_continue_super(struct btrfs_root *root) |
| 1694 | { |
| 1695 | up_write(&root->fs_info->scrub_super_lock); |
| 1696 | return 0; |
| 1697 | } |
| 1698 | |
| 1699 | int btrfs_scrub_cancel(struct btrfs_root *root) |
| 1700 | { |
| 1701 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1702 | |
| 1703 | mutex_lock(&fs_info->scrub_lock); |
| 1704 | if (!atomic_read(&fs_info->scrubs_running)) { |
| 1705 | mutex_unlock(&fs_info->scrub_lock); |
| 1706 | return -ENOTCONN; |
| 1707 | } |
| 1708 | |
| 1709 | atomic_inc(&fs_info->scrub_cancel_req); |
| 1710 | while (atomic_read(&fs_info->scrubs_running)) { |
| 1711 | mutex_unlock(&fs_info->scrub_lock); |
| 1712 | wait_event(fs_info->scrub_pause_wait, |
| 1713 | atomic_read(&fs_info->scrubs_running) == 0); |
| 1714 | mutex_lock(&fs_info->scrub_lock); |
| 1715 | } |
| 1716 | atomic_dec(&fs_info->scrub_cancel_req); |
| 1717 | mutex_unlock(&fs_info->scrub_lock); |
| 1718 | |
| 1719 | return 0; |
| 1720 | } |
| 1721 | |
| 1722 | int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev) |
| 1723 | { |
| 1724 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1725 | struct scrub_dev *sdev; |
| 1726 | |
| 1727 | mutex_lock(&fs_info->scrub_lock); |
| 1728 | sdev = dev->scrub_device; |
| 1729 | if (!sdev) { |
| 1730 | mutex_unlock(&fs_info->scrub_lock); |
| 1731 | return -ENOTCONN; |
| 1732 | } |
| 1733 | atomic_inc(&sdev->cancel_req); |
| 1734 | while (dev->scrub_device) { |
| 1735 | mutex_unlock(&fs_info->scrub_lock); |
| 1736 | wait_event(fs_info->scrub_pause_wait, |
| 1737 | dev->scrub_device == NULL); |
| 1738 | mutex_lock(&fs_info->scrub_lock); |
| 1739 | } |
| 1740 | mutex_unlock(&fs_info->scrub_lock); |
| 1741 | |
| 1742 | return 0; |
| 1743 | } |
| 1744 | int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid) |
| 1745 | { |
| 1746 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1747 | struct btrfs_device *dev; |
| 1748 | int ret; |
| 1749 | |
| 1750 | /* |
| 1751 | * we have to hold the device_list_mutex here so the device |
| 1752 | * does not go away in cancel_dev. FIXME: find a better solution |
| 1753 | */ |
| 1754 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
| 1755 | dev = btrfs_find_device(root, devid, NULL, NULL); |
| 1756 | if (!dev) { |
| 1757 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 1758 | return -ENODEV; |
| 1759 | } |
| 1760 | ret = btrfs_scrub_cancel_dev(root, dev); |
| 1761 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 1762 | |
| 1763 | return ret; |
| 1764 | } |
| 1765 | |
| 1766 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
| 1767 | struct btrfs_scrub_progress *progress) |
| 1768 | { |
| 1769 | struct btrfs_device *dev; |
| 1770 | struct scrub_dev *sdev = NULL; |
| 1771 | |
| 1772 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
| 1773 | dev = btrfs_find_device(root, devid, NULL, NULL); |
| 1774 | if (dev) |
| 1775 | sdev = dev->scrub_device; |
| 1776 | if (sdev) |
| 1777 | memcpy(progress, &sdev->stat, sizeof(*progress)); |
| 1778 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 1779 | |
| 1780 | return dev ? (sdev ? 0 : -ENOTCONN) : -ENODEV; |
| 1781 | } |