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" |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 29 | #include "rcu-string.h" |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 30 | |
| 31 | /* |
| 32 | * This is only the first step towards a full-features scrub. It reads all |
| 33 | * extent and super block and verifies the checksums. In case a bad checksum |
| 34 | * is found or the extent cannot be read, good data will be written back if |
| 35 | * any can be found. |
| 36 | * |
| 37 | * Future enhancements: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 38 | * - In case an unrepairable extent is encountered, track which files are |
| 39 | * affected and report them |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 40 | * - track and record media errors, throw out bad devices |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 41 | * - add a mode to also read unallocated space |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 42 | */ |
| 43 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 44 | struct scrub_block; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 45 | struct scrub_dev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 46 | |
| 47 | #define SCRUB_PAGES_PER_BIO 16 /* 64k per bio */ |
| 48 | #define SCRUB_BIOS_PER_DEV 16 /* 1 MB per device in flight */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 49 | #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */ |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 50 | |
| 51 | struct scrub_page { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 52 | struct scrub_block *sblock; |
| 53 | struct page *page; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 54 | struct btrfs_device *dev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 55 | u64 flags; /* extent flags */ |
| 56 | u64 generation; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 57 | u64 logical; |
| 58 | u64 physical; |
| 59 | struct { |
| 60 | unsigned int mirror_num:8; |
| 61 | unsigned int have_csum:1; |
| 62 | unsigned int io_error:1; |
| 63 | }; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 64 | u8 csum[BTRFS_CSUM_SIZE]; |
| 65 | }; |
| 66 | |
| 67 | struct scrub_bio { |
| 68 | int index; |
| 69 | struct scrub_dev *sdev; |
| 70 | struct bio *bio; |
| 71 | int err; |
| 72 | u64 logical; |
| 73 | u64 physical; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 74 | struct scrub_page *pagev[SCRUB_PAGES_PER_BIO]; |
| 75 | int page_count; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 76 | int next_free; |
| 77 | struct btrfs_work work; |
| 78 | }; |
| 79 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 80 | struct scrub_block { |
| 81 | struct scrub_page pagev[SCRUB_MAX_PAGES_PER_BLOCK]; |
| 82 | int page_count; |
| 83 | atomic_t outstanding_pages; |
| 84 | atomic_t ref_count; /* free mem on transition to zero */ |
| 85 | struct scrub_dev *sdev; |
| 86 | struct { |
| 87 | unsigned int header_error:1; |
| 88 | unsigned int checksum_error:1; |
| 89 | unsigned int no_io_error_seen:1; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 90 | unsigned int generation_error:1; /* also sets header_error */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 91 | }; |
| 92 | }; |
| 93 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 94 | struct scrub_dev { |
| 95 | struct scrub_bio *bios[SCRUB_BIOS_PER_DEV]; |
| 96 | struct btrfs_device *dev; |
| 97 | int first_free; |
| 98 | int curr; |
| 99 | atomic_t in_flight; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 100 | atomic_t fixup_cnt; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 101 | spinlock_t list_lock; |
| 102 | wait_queue_head_t list_wait; |
| 103 | u16 csum_size; |
| 104 | struct list_head csum_list; |
| 105 | atomic_t cancel_req; |
Arne Jansen | 8628764 | 2011-03-23 16:34:19 +0100 | [diff] [blame] | 106 | int readonly; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 107 | int pages_per_bio; /* <= SCRUB_PAGES_PER_BIO */ |
| 108 | u32 sectorsize; |
| 109 | u32 nodesize; |
| 110 | u32 leafsize; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 111 | /* |
| 112 | * statistics |
| 113 | */ |
| 114 | struct btrfs_scrub_progress stat; |
| 115 | spinlock_t stat_lock; |
| 116 | }; |
| 117 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 118 | struct scrub_fixup_nodatasum { |
| 119 | struct scrub_dev *sdev; |
| 120 | u64 logical; |
| 121 | struct btrfs_root *root; |
| 122 | struct btrfs_work work; |
| 123 | int mirror_num; |
| 124 | }; |
| 125 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 126 | struct scrub_warning { |
| 127 | struct btrfs_path *path; |
| 128 | u64 extent_item_size; |
| 129 | char *scratch_buf; |
| 130 | char *msg_buf; |
| 131 | const char *errstr; |
| 132 | sector_t sector; |
| 133 | u64 logical; |
| 134 | struct btrfs_device *dev; |
| 135 | int msg_bufsize; |
| 136 | int scratch_bufsize; |
| 137 | }; |
| 138 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 139 | |
| 140 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
| 141 | static int scrub_setup_recheck_block(struct scrub_dev *sdev, |
| 142 | struct btrfs_mapping_tree *map_tree, |
| 143 | u64 length, u64 logical, |
| 144 | struct scrub_block *sblock); |
| 145 | static int scrub_recheck_block(struct btrfs_fs_info *fs_info, |
| 146 | struct scrub_block *sblock, int is_metadata, |
| 147 | int have_csum, u8 *csum, u64 generation, |
| 148 | u16 csum_size); |
| 149 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
| 150 | struct scrub_block *sblock, |
| 151 | int is_metadata, int have_csum, |
| 152 | const u8 *csum, u64 generation, |
| 153 | u16 csum_size); |
| 154 | static void scrub_complete_bio_end_io(struct bio *bio, int err); |
| 155 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
| 156 | struct scrub_block *sblock_good, |
| 157 | int force_write); |
| 158 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
| 159 | struct scrub_block *sblock_good, |
| 160 | int page_num, int force_write); |
| 161 | static int scrub_checksum_data(struct scrub_block *sblock); |
| 162 | static int scrub_checksum_tree_block(struct scrub_block *sblock); |
| 163 | static int scrub_checksum_super(struct scrub_block *sblock); |
| 164 | static void scrub_block_get(struct scrub_block *sblock); |
| 165 | static void scrub_block_put(struct scrub_block *sblock); |
| 166 | static int scrub_add_page_to_bio(struct scrub_dev *sdev, |
| 167 | struct scrub_page *spage); |
| 168 | static int scrub_pages(struct scrub_dev *sdev, u64 logical, u64 len, |
| 169 | u64 physical, u64 flags, u64 gen, int mirror_num, |
| 170 | u8 *csum, int force); |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 171 | static void scrub_bio_end_io(struct bio *bio, int err); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 172 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
| 173 | static void scrub_block_complete(struct scrub_block *sblock); |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 174 | |
| 175 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 176 | static void scrub_free_csums(struct scrub_dev *sdev) |
| 177 | { |
| 178 | while (!list_empty(&sdev->csum_list)) { |
| 179 | struct btrfs_ordered_sum *sum; |
| 180 | sum = list_first_entry(&sdev->csum_list, |
| 181 | struct btrfs_ordered_sum, list); |
| 182 | list_del(&sum->list); |
| 183 | kfree(sum); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | static noinline_for_stack void scrub_free_dev(struct scrub_dev *sdev) |
| 188 | { |
| 189 | int i; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 190 | |
| 191 | if (!sdev) |
| 192 | return; |
| 193 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 194 | /* this can happen when scrub is cancelled */ |
| 195 | if (sdev->curr != -1) { |
| 196 | struct scrub_bio *sbio = sdev->bios[sdev->curr]; |
| 197 | |
| 198 | for (i = 0; i < sbio->page_count; i++) { |
| 199 | BUG_ON(!sbio->pagev[i]); |
| 200 | BUG_ON(!sbio->pagev[i]->page); |
| 201 | scrub_block_put(sbio->pagev[i]->sblock); |
| 202 | } |
| 203 | bio_put(sbio->bio); |
| 204 | } |
| 205 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 206 | for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) { |
| 207 | struct scrub_bio *sbio = sdev->bios[i]; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 208 | |
| 209 | if (!sbio) |
| 210 | break; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 211 | kfree(sbio); |
| 212 | } |
| 213 | |
| 214 | scrub_free_csums(sdev); |
| 215 | kfree(sdev); |
| 216 | } |
| 217 | |
| 218 | static noinline_for_stack |
| 219 | struct scrub_dev *scrub_setup_dev(struct btrfs_device *dev) |
| 220 | { |
| 221 | struct scrub_dev *sdev; |
| 222 | int i; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 223 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 224 | int pages_per_bio; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 225 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 226 | pages_per_bio = min_t(int, SCRUB_PAGES_PER_BIO, |
| 227 | bio_get_nr_vecs(dev->bdev)); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 228 | sdev = kzalloc(sizeof(*sdev), GFP_NOFS); |
| 229 | if (!sdev) |
| 230 | goto nomem; |
| 231 | sdev->dev = dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 232 | sdev->pages_per_bio = pages_per_bio; |
| 233 | sdev->curr = -1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 234 | for (i = 0; i < SCRUB_BIOS_PER_DEV; ++i) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 235 | struct scrub_bio *sbio; |
| 236 | |
| 237 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); |
| 238 | if (!sbio) |
| 239 | goto nomem; |
| 240 | sdev->bios[i] = sbio; |
| 241 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 242 | sbio->index = i; |
| 243 | sbio->sdev = sdev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 244 | sbio->page_count = 0; |
| 245 | sbio->work.func = scrub_bio_end_io_worker; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 246 | |
| 247 | if (i != SCRUB_BIOS_PER_DEV-1) |
| 248 | sdev->bios[i]->next_free = i + 1; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 249 | else |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 250 | sdev->bios[i]->next_free = -1; |
| 251 | } |
| 252 | sdev->first_free = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 253 | sdev->nodesize = dev->dev_root->nodesize; |
| 254 | sdev->leafsize = dev->dev_root->leafsize; |
| 255 | sdev->sectorsize = dev->dev_root->sectorsize; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 256 | atomic_set(&sdev->in_flight, 0); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 257 | atomic_set(&sdev->fixup_cnt, 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 258 | atomic_set(&sdev->cancel_req, 0); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 259 | sdev->csum_size = btrfs_super_csum_size(fs_info->super_copy); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 260 | INIT_LIST_HEAD(&sdev->csum_list); |
| 261 | |
| 262 | spin_lock_init(&sdev->list_lock); |
| 263 | spin_lock_init(&sdev->stat_lock); |
| 264 | init_waitqueue_head(&sdev->list_wait); |
| 265 | return sdev; |
| 266 | |
| 267 | nomem: |
| 268 | scrub_free_dev(sdev); |
| 269 | return ERR_PTR(-ENOMEM); |
| 270 | } |
| 271 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 272 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, void *ctx) |
| 273 | { |
| 274 | u64 isize; |
| 275 | u32 nlink; |
| 276 | int ret; |
| 277 | int i; |
| 278 | struct extent_buffer *eb; |
| 279 | struct btrfs_inode_item *inode_item; |
| 280 | struct scrub_warning *swarn = ctx; |
| 281 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
| 282 | struct inode_fs_paths *ipath = NULL; |
| 283 | struct btrfs_root *local_root; |
| 284 | struct btrfs_key root_key; |
| 285 | |
| 286 | root_key.objectid = root; |
| 287 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 288 | root_key.offset = (u64)-1; |
| 289 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); |
| 290 | if (IS_ERR(local_root)) { |
| 291 | ret = PTR_ERR(local_root); |
| 292 | goto err; |
| 293 | } |
| 294 | |
| 295 | ret = inode_item_info(inum, 0, local_root, swarn->path); |
| 296 | if (ret) { |
| 297 | btrfs_release_path(swarn->path); |
| 298 | goto err; |
| 299 | } |
| 300 | |
| 301 | eb = swarn->path->nodes[0]; |
| 302 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], |
| 303 | struct btrfs_inode_item); |
| 304 | isize = btrfs_inode_size(eb, inode_item); |
| 305 | nlink = btrfs_inode_nlink(eb, inode_item); |
| 306 | btrfs_release_path(swarn->path); |
| 307 | |
| 308 | ipath = init_ipath(4096, local_root, swarn->path); |
Dan Carpenter | 26bdef5 | 2011-11-16 11:28:01 +0300 | [diff] [blame] | 309 | if (IS_ERR(ipath)) { |
| 310 | ret = PTR_ERR(ipath); |
| 311 | ipath = NULL; |
| 312 | goto err; |
| 313 | } |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 314 | ret = paths_from_inode(inum, ipath); |
| 315 | |
| 316 | if (ret < 0) |
| 317 | goto err; |
| 318 | |
| 319 | /* |
| 320 | * we deliberately ignore the bit ipath might have been too small to |
| 321 | * hold all of the paths here |
| 322 | */ |
| 323 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 324 | printk_in_rcu(KERN_WARNING "btrfs: %s at logical %llu on dev " |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 325 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
| 326 | "length %llu, links %u (path: %s)\n", swarn->errstr, |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 327 | swarn->logical, rcu_str_deref(swarn->dev->name), |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 328 | (unsigned long long)swarn->sector, root, inum, offset, |
| 329 | min(isize - offset, (u64)PAGE_SIZE), nlink, |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 330 | (char *)(unsigned long)ipath->fspath->val[i]); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 331 | |
| 332 | free_ipath(ipath); |
| 333 | return 0; |
| 334 | |
| 335 | err: |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 336 | printk_in_rcu(KERN_WARNING "btrfs: %s at logical %llu on dev " |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 337 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
| 338 | "resolving failed with ret=%d\n", swarn->errstr, |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 339 | swarn->logical, rcu_str_deref(swarn->dev->name), |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 340 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
| 341 | |
| 342 | free_ipath(ipath); |
| 343 | return 0; |
| 344 | } |
| 345 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 346 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 347 | { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 348 | struct btrfs_device *dev = sblock->sdev->dev; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 349 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
| 350 | struct btrfs_path *path; |
| 351 | struct btrfs_key found_key; |
| 352 | struct extent_buffer *eb; |
| 353 | struct btrfs_extent_item *ei; |
| 354 | struct scrub_warning swarn; |
| 355 | u32 item_size; |
| 356 | int ret; |
| 357 | u64 ref_root; |
| 358 | u8 ref_level; |
| 359 | unsigned long ptr = 0; |
| 360 | const int bufsize = 4096; |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 361 | u64 extent_item_pos; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 362 | |
| 363 | path = btrfs_alloc_path(); |
| 364 | |
| 365 | swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS); |
| 366 | swarn.msg_buf = kmalloc(bufsize, GFP_NOFS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 367 | BUG_ON(sblock->page_count < 1); |
| 368 | swarn.sector = (sblock->pagev[0].physical) >> 9; |
| 369 | swarn.logical = sblock->pagev[0].logical; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 370 | swarn.errstr = errstr; |
| 371 | swarn.dev = dev; |
| 372 | swarn.msg_bufsize = bufsize; |
| 373 | swarn.scratch_bufsize = bufsize; |
| 374 | |
| 375 | if (!path || !swarn.scratch_buf || !swarn.msg_buf) |
| 376 | goto out; |
| 377 | |
| 378 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key); |
| 379 | if (ret < 0) |
| 380 | goto out; |
| 381 | |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 382 | extent_item_pos = swarn.logical - found_key.objectid; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 383 | swarn.extent_item_size = found_key.offset; |
| 384 | |
| 385 | eb = path->nodes[0]; |
| 386 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); |
| 387 | item_size = btrfs_item_size_nr(eb, path->slots[0]); |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 388 | btrfs_release_path(path); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 389 | |
| 390 | if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
| 391 | do { |
| 392 | ret = tree_backref_for_extent(&ptr, eb, ei, item_size, |
| 393 | &ref_root, &ref_level); |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 394 | printk_in_rcu(KERN_WARNING |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 395 | "btrfs: %s at logical %llu on dev %s, " |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 396 | "sector %llu: metadata %s (level %d) in tree " |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 397 | "%llu\n", errstr, swarn.logical, |
| 398 | rcu_str_deref(dev->name), |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 399 | (unsigned long long)swarn.sector, |
| 400 | ref_level ? "node" : "leaf", |
| 401 | ret < 0 ? -1 : ref_level, |
| 402 | ret < 0 ? -1 : ref_root); |
| 403 | } while (ret != 1); |
| 404 | } else { |
| 405 | swarn.path = path; |
Jan Schmidt | 7a3ae2f | 2012-03-23 17:32:28 +0100 | [diff] [blame] | 406 | iterate_extent_inodes(fs_info, found_key.objectid, |
| 407 | extent_item_pos, 1, |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 408 | scrub_print_warning_inode, &swarn); |
| 409 | } |
| 410 | |
| 411 | out: |
| 412 | btrfs_free_path(path); |
| 413 | kfree(swarn.scratch_buf); |
| 414 | kfree(swarn.msg_buf); |
| 415 | } |
| 416 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 417 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *ctx) |
| 418 | { |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 419 | struct page *page = NULL; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 420 | unsigned long index; |
| 421 | struct scrub_fixup_nodatasum *fixup = ctx; |
| 422 | int ret; |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 423 | int corrected = 0; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 424 | struct btrfs_key key; |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 425 | struct inode *inode = NULL; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 426 | u64 end = offset + PAGE_SIZE - 1; |
| 427 | struct btrfs_root *local_root; |
| 428 | |
| 429 | key.objectid = root; |
| 430 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 431 | key.offset = (u64)-1; |
| 432 | local_root = btrfs_read_fs_root_no_name(fixup->root->fs_info, &key); |
| 433 | if (IS_ERR(local_root)) |
| 434 | return PTR_ERR(local_root); |
| 435 | |
| 436 | key.type = BTRFS_INODE_ITEM_KEY; |
| 437 | key.objectid = inum; |
| 438 | key.offset = 0; |
| 439 | inode = btrfs_iget(fixup->root->fs_info->sb, &key, local_root, NULL); |
| 440 | if (IS_ERR(inode)) |
| 441 | return PTR_ERR(inode); |
| 442 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 443 | index = offset >> PAGE_CACHE_SHIFT; |
| 444 | |
| 445 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 446 | if (!page) { |
| 447 | ret = -ENOMEM; |
| 448 | goto out; |
| 449 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 450 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 451 | if (PageUptodate(page)) { |
| 452 | struct btrfs_mapping_tree *map_tree; |
| 453 | if (PageDirty(page)) { |
| 454 | /* |
| 455 | * we need to write the data to the defect sector. the |
| 456 | * data that was in that sector is not in memory, |
| 457 | * because the page was modified. we must not write the |
| 458 | * modified page to that sector. |
| 459 | * |
| 460 | * TODO: what could be done here: wait for the delalloc |
| 461 | * runner to write out that page (might involve |
| 462 | * COW) and see whether the sector is still |
| 463 | * referenced afterwards. |
| 464 | * |
| 465 | * For the meantime, we'll treat this error |
| 466 | * incorrectable, although there is a chance that a |
| 467 | * later scrub will find the bad sector again and that |
| 468 | * there's no dirty page in memory, then. |
| 469 | */ |
| 470 | ret = -EIO; |
| 471 | goto out; |
| 472 | } |
| 473 | map_tree = &BTRFS_I(inode)->root->fs_info->mapping_tree; |
| 474 | ret = repair_io_failure(map_tree, offset, PAGE_SIZE, |
| 475 | fixup->logical, page, |
| 476 | fixup->mirror_num); |
| 477 | unlock_page(page); |
| 478 | corrected = !ret; |
| 479 | } else { |
| 480 | /* |
| 481 | * we need to get good data first. the general readpage path |
| 482 | * will call repair_io_failure for us, we just have to make |
| 483 | * sure we read the bad mirror. |
| 484 | */ |
| 485 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, |
| 486 | EXTENT_DAMAGED, GFP_NOFS); |
| 487 | if (ret) { |
| 488 | /* set_extent_bits should give proper error */ |
| 489 | WARN_ON(ret > 0); |
| 490 | if (ret > 0) |
| 491 | ret = -EFAULT; |
| 492 | goto out; |
| 493 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 494 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 495 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, |
| 496 | btrfs_get_extent, |
| 497 | fixup->mirror_num); |
| 498 | wait_on_page_locked(page); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 499 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 500 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, |
| 501 | end, EXTENT_DAMAGED, 0, NULL); |
| 502 | if (!corrected) |
| 503 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, |
| 504 | EXTENT_DAMAGED, GFP_NOFS); |
| 505 | } |
| 506 | |
| 507 | out: |
| 508 | if (page) |
| 509 | put_page(page); |
| 510 | if (inode) |
| 511 | iput(inode); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 512 | |
| 513 | if (ret < 0) |
| 514 | return ret; |
| 515 | |
| 516 | if (ret == 0 && corrected) { |
| 517 | /* |
| 518 | * we only need to call readpage for one of the inodes belonging |
| 519 | * to this extent. so make iterate_extent_inodes stop |
| 520 | */ |
| 521 | return 1; |
| 522 | } |
| 523 | |
| 524 | return -EIO; |
| 525 | } |
| 526 | |
| 527 | static void scrub_fixup_nodatasum(struct btrfs_work *work) |
| 528 | { |
| 529 | int ret; |
| 530 | struct scrub_fixup_nodatasum *fixup; |
| 531 | struct scrub_dev *sdev; |
| 532 | struct btrfs_trans_handle *trans = NULL; |
| 533 | struct btrfs_fs_info *fs_info; |
| 534 | struct btrfs_path *path; |
| 535 | int uncorrectable = 0; |
| 536 | |
| 537 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); |
| 538 | sdev = fixup->sdev; |
| 539 | fs_info = fixup->root->fs_info; |
| 540 | |
| 541 | path = btrfs_alloc_path(); |
| 542 | if (!path) { |
| 543 | spin_lock(&sdev->stat_lock); |
| 544 | ++sdev->stat.malloc_errors; |
| 545 | spin_unlock(&sdev->stat_lock); |
| 546 | uncorrectable = 1; |
| 547 | goto out; |
| 548 | } |
| 549 | |
| 550 | trans = btrfs_join_transaction(fixup->root); |
| 551 | if (IS_ERR(trans)) { |
| 552 | uncorrectable = 1; |
| 553 | goto out; |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * the idea is to trigger a regular read through the standard path. we |
| 558 | * read a page from the (failed) logical address by specifying the |
| 559 | * corresponding copynum of the failed sector. thus, that readpage is |
| 560 | * expected to fail. |
| 561 | * that is the point where on-the-fly error correction will kick in |
| 562 | * (once it's finished) and rewrite the failed sector if a good copy |
| 563 | * can be found. |
| 564 | */ |
| 565 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, |
| 566 | path, scrub_fixup_readpage, |
| 567 | fixup); |
| 568 | if (ret < 0) { |
| 569 | uncorrectable = 1; |
| 570 | goto out; |
| 571 | } |
| 572 | WARN_ON(ret != 1); |
| 573 | |
| 574 | spin_lock(&sdev->stat_lock); |
| 575 | ++sdev->stat.corrected_errors; |
| 576 | spin_unlock(&sdev->stat_lock); |
| 577 | |
| 578 | out: |
| 579 | if (trans && !IS_ERR(trans)) |
| 580 | btrfs_end_transaction(trans, fixup->root); |
| 581 | if (uncorrectable) { |
| 582 | spin_lock(&sdev->stat_lock); |
| 583 | ++sdev->stat.uncorrectable_errors; |
| 584 | spin_unlock(&sdev->stat_lock); |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 585 | |
| 586 | printk_ratelimited_in_rcu(KERN_ERR |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 587 | "btrfs: unable to fixup (nodatasum) error at logical %llu on dev %s\n", |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 588 | (unsigned long long)fixup->logical, |
| 589 | rcu_str_deref(sdev->dev->name)); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 590 | } |
| 591 | |
| 592 | btrfs_free_path(path); |
| 593 | kfree(fixup); |
| 594 | |
| 595 | /* see caller why we're pretending to be paused in the scrub counters */ |
| 596 | mutex_lock(&fs_info->scrub_lock); |
| 597 | atomic_dec(&fs_info->scrubs_running); |
| 598 | atomic_dec(&fs_info->scrubs_paused); |
| 599 | mutex_unlock(&fs_info->scrub_lock); |
| 600 | atomic_dec(&sdev->fixup_cnt); |
| 601 | wake_up(&fs_info->scrub_pause_wait); |
| 602 | wake_up(&sdev->list_wait); |
| 603 | } |
| 604 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 605 | /* |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 606 | * scrub_handle_errored_block gets called when either verification of the |
| 607 | * pages failed or the bio failed to read, e.g. with EIO. In the latter |
| 608 | * case, this function handles all pages in the bio, even though only one |
| 609 | * may be bad. |
| 610 | * The goal of this function is to repair the errored block by using the |
| 611 | * contents of one of the mirrors. |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 612 | */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 613 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 614 | { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 615 | struct scrub_dev *sdev = sblock_to_check->sdev; |
| 616 | struct btrfs_fs_info *fs_info; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 617 | u64 length; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 618 | u64 logical; |
| 619 | u64 generation; |
| 620 | unsigned int failed_mirror_index; |
| 621 | unsigned int is_metadata; |
| 622 | unsigned int have_csum; |
| 623 | u8 *csum; |
| 624 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ |
| 625 | struct scrub_block *sblock_bad; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 626 | int ret; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 627 | int mirror_index; |
| 628 | int page_num; |
| 629 | int success; |
| 630 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
| 631 | DEFAULT_RATELIMIT_BURST); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 632 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 633 | BUG_ON(sblock_to_check->page_count < 1); |
| 634 | fs_info = sdev->dev->dev_root->fs_info; |
| 635 | length = sblock_to_check->page_count * PAGE_SIZE; |
| 636 | logical = sblock_to_check->pagev[0].logical; |
| 637 | generation = sblock_to_check->pagev[0].generation; |
| 638 | BUG_ON(sblock_to_check->pagev[0].mirror_num < 1); |
| 639 | failed_mirror_index = sblock_to_check->pagev[0].mirror_num - 1; |
| 640 | is_metadata = !(sblock_to_check->pagev[0].flags & |
| 641 | BTRFS_EXTENT_FLAG_DATA); |
| 642 | have_csum = sblock_to_check->pagev[0].have_csum; |
| 643 | csum = sblock_to_check->pagev[0].csum; |
| 644 | |
| 645 | /* |
| 646 | * read all mirrors one after the other. This includes to |
| 647 | * re-read the extent or metadata block that failed (that was |
| 648 | * the cause that this fixup code is called) another time, |
| 649 | * page by page this time in order to know which pages |
| 650 | * caused I/O errors and which ones are good (for all mirrors). |
| 651 | * It is the goal to handle the situation when more than one |
| 652 | * mirror contains I/O errors, but the errors do not |
| 653 | * overlap, i.e. the data can be repaired by selecting the |
| 654 | * pages from those mirrors without I/O error on the |
| 655 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) |
| 656 | * would be that mirror #1 has an I/O error on the first page, |
| 657 | * the second page is good, and mirror #2 has an I/O error on |
| 658 | * the second page, but the first page is good. |
| 659 | * Then the first page of the first mirror can be repaired by |
| 660 | * taking the first page of the second mirror, and the |
| 661 | * second page of the second mirror can be repaired by |
| 662 | * copying the contents of the 2nd page of the 1st mirror. |
| 663 | * One more note: if the pages of one mirror contain I/O |
| 664 | * errors, the checksum cannot be verified. In order to get |
| 665 | * the best data for repairing, the first attempt is to find |
| 666 | * a mirror without I/O errors and with a validated checksum. |
| 667 | * Only if this is not possible, the pages are picked from |
| 668 | * mirrors with I/O errors without considering the checksum. |
| 669 | * If the latter is the case, at the end, the checksum of the |
| 670 | * repaired area is verified in order to correctly maintain |
| 671 | * the statistics. |
| 672 | */ |
| 673 | |
| 674 | sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS * |
| 675 | sizeof(*sblocks_for_recheck), |
| 676 | GFP_NOFS); |
| 677 | if (!sblocks_for_recheck) { |
| 678 | spin_lock(&sdev->stat_lock); |
| 679 | sdev->stat.malloc_errors++; |
| 680 | sdev->stat.read_errors++; |
| 681 | sdev->stat.uncorrectable_errors++; |
| 682 | spin_unlock(&sdev->stat_lock); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 683 | btrfs_dev_stat_inc_and_print(sdev->dev, |
| 684 | BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 685 | goto out; |
| 686 | } |
| 687 | |
| 688 | /* setup the context, map the logical blocks and alloc the pages */ |
| 689 | ret = scrub_setup_recheck_block(sdev, &fs_info->mapping_tree, length, |
| 690 | logical, sblocks_for_recheck); |
| 691 | if (ret) { |
| 692 | spin_lock(&sdev->stat_lock); |
| 693 | sdev->stat.read_errors++; |
| 694 | sdev->stat.uncorrectable_errors++; |
| 695 | spin_unlock(&sdev->stat_lock); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 696 | btrfs_dev_stat_inc_and_print(sdev->dev, |
| 697 | BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 698 | goto out; |
| 699 | } |
| 700 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); |
| 701 | sblock_bad = sblocks_for_recheck + failed_mirror_index; |
| 702 | |
| 703 | /* build and submit the bios for the failed mirror, check checksums */ |
| 704 | ret = scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum, |
| 705 | csum, generation, sdev->csum_size); |
| 706 | if (ret) { |
| 707 | spin_lock(&sdev->stat_lock); |
| 708 | sdev->stat.read_errors++; |
| 709 | sdev->stat.uncorrectable_errors++; |
| 710 | spin_unlock(&sdev->stat_lock); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 711 | btrfs_dev_stat_inc_and_print(sdev->dev, |
| 712 | BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 713 | goto out; |
| 714 | } |
| 715 | |
| 716 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
| 717 | sblock_bad->no_io_error_seen) { |
| 718 | /* |
| 719 | * the error disappeared after reading page by page, or |
| 720 | * the area was part of a huge bio and other parts of the |
| 721 | * bio caused I/O errors, or the block layer merged several |
| 722 | * read requests into one and the error is caused by a |
| 723 | * different bio (usually one of the two latter cases is |
| 724 | * the cause) |
| 725 | */ |
| 726 | spin_lock(&sdev->stat_lock); |
| 727 | sdev->stat.unverified_errors++; |
| 728 | spin_unlock(&sdev->stat_lock); |
| 729 | |
| 730 | goto out; |
| 731 | } |
| 732 | |
| 733 | if (!sblock_bad->no_io_error_seen) { |
| 734 | spin_lock(&sdev->stat_lock); |
| 735 | sdev->stat.read_errors++; |
| 736 | spin_unlock(&sdev->stat_lock); |
| 737 | if (__ratelimit(&_rs)) |
| 738 | scrub_print_warning("i/o error", sblock_to_check); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 739 | btrfs_dev_stat_inc_and_print(sdev->dev, |
| 740 | BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 741 | } else if (sblock_bad->checksum_error) { |
| 742 | spin_lock(&sdev->stat_lock); |
| 743 | sdev->stat.csum_errors++; |
| 744 | spin_unlock(&sdev->stat_lock); |
| 745 | if (__ratelimit(&_rs)) |
| 746 | scrub_print_warning("checksum error", sblock_to_check); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 747 | btrfs_dev_stat_inc_and_print(sdev->dev, |
| 748 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 749 | } else if (sblock_bad->header_error) { |
| 750 | spin_lock(&sdev->stat_lock); |
| 751 | sdev->stat.verify_errors++; |
| 752 | spin_unlock(&sdev->stat_lock); |
| 753 | if (__ratelimit(&_rs)) |
| 754 | scrub_print_warning("checksum/header error", |
| 755 | sblock_to_check); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 756 | if (sblock_bad->generation_error) |
| 757 | btrfs_dev_stat_inc_and_print(sdev->dev, |
| 758 | BTRFS_DEV_STAT_GENERATION_ERRS); |
| 759 | else |
| 760 | btrfs_dev_stat_inc_and_print(sdev->dev, |
| 761 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | if (sdev->readonly) |
| 765 | goto did_not_correct_error; |
| 766 | |
| 767 | if (!is_metadata && !have_csum) { |
| 768 | struct scrub_fixup_nodatasum *fixup_nodatasum; |
| 769 | |
| 770 | /* |
| 771 | * !is_metadata and !have_csum, this means that the data |
| 772 | * might not be COW'ed, that it might be modified |
| 773 | * concurrently. The general strategy to work on the |
| 774 | * commit root does not help in the case when COW is not |
| 775 | * used. |
| 776 | */ |
| 777 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); |
| 778 | if (!fixup_nodatasum) |
| 779 | goto did_not_correct_error; |
| 780 | fixup_nodatasum->sdev = sdev; |
| 781 | fixup_nodatasum->logical = logical; |
| 782 | fixup_nodatasum->root = fs_info->extent_root; |
| 783 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 784 | /* |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 785 | * increment scrubs_running to prevent cancel requests from |
| 786 | * completing as long as a fixup worker is running. we must also |
| 787 | * increment scrubs_paused to prevent deadlocking on pause |
| 788 | * requests used for transactions commits (as the worker uses a |
| 789 | * transaction context). it is safe to regard the fixup worker |
| 790 | * as paused for all matters practical. effectively, we only |
| 791 | * avoid cancellation requests from completing. |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 792 | */ |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 793 | mutex_lock(&fs_info->scrub_lock); |
| 794 | atomic_inc(&fs_info->scrubs_running); |
| 795 | atomic_inc(&fs_info->scrubs_paused); |
| 796 | mutex_unlock(&fs_info->scrub_lock); |
| 797 | atomic_inc(&sdev->fixup_cnt); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 798 | fixup_nodatasum->work.func = scrub_fixup_nodatasum; |
| 799 | btrfs_queue_worker(&fs_info->scrub_workers, |
| 800 | &fixup_nodatasum->work); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 801 | goto out; |
| 802 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 803 | |
| 804 | /* |
| 805 | * now build and submit the bios for the other mirrors, check |
| 806 | * checksums |
| 807 | */ |
| 808 | for (mirror_index = 0; |
| 809 | mirror_index < BTRFS_MAX_MIRRORS && |
| 810 | sblocks_for_recheck[mirror_index].page_count > 0; |
| 811 | mirror_index++) { |
| 812 | if (mirror_index == failed_mirror_index) |
| 813 | continue; |
| 814 | |
| 815 | /* build and submit the bios, check checksums */ |
| 816 | ret = scrub_recheck_block(fs_info, |
| 817 | sblocks_for_recheck + mirror_index, |
| 818 | is_metadata, have_csum, csum, |
| 819 | generation, sdev->csum_size); |
| 820 | if (ret) |
| 821 | goto did_not_correct_error; |
| 822 | } |
| 823 | |
| 824 | /* |
| 825 | * first try to pick the mirror which is completely without I/O |
| 826 | * errors and also does not have a checksum error. |
| 827 | * If one is found, and if a checksum is present, the full block |
| 828 | * that is known to contain an error is rewritten. Afterwards |
| 829 | * the block is known to be corrected. |
| 830 | * If a mirror is found which is completely correct, and no |
| 831 | * checksum is present, only those pages are rewritten that had |
| 832 | * an I/O error in the block to be repaired, since it cannot be |
| 833 | * determined, which copy of the other pages is better (and it |
| 834 | * could happen otherwise that a correct page would be |
| 835 | * overwritten by a bad one). |
| 836 | */ |
| 837 | for (mirror_index = 0; |
| 838 | mirror_index < BTRFS_MAX_MIRRORS && |
| 839 | sblocks_for_recheck[mirror_index].page_count > 0; |
| 840 | mirror_index++) { |
| 841 | struct scrub_block *sblock_other = sblocks_for_recheck + |
| 842 | mirror_index; |
| 843 | |
| 844 | if (!sblock_other->header_error && |
| 845 | !sblock_other->checksum_error && |
| 846 | sblock_other->no_io_error_seen) { |
| 847 | int force_write = is_metadata || have_csum; |
| 848 | |
| 849 | ret = scrub_repair_block_from_good_copy(sblock_bad, |
| 850 | sblock_other, |
| 851 | force_write); |
| 852 | if (0 == ret) |
| 853 | goto corrected_error; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 854 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | /* |
| 858 | * in case of I/O errors in the area that is supposed to be |
| 859 | * repaired, continue by picking good copies of those pages. |
| 860 | * Select the good pages from mirrors to rewrite bad pages from |
| 861 | * the area to fix. Afterwards verify the checksum of the block |
| 862 | * that is supposed to be repaired. This verification step is |
| 863 | * only done for the purpose of statistic counting and for the |
| 864 | * final scrub report, whether errors remain. |
| 865 | * A perfect algorithm could make use of the checksum and try |
| 866 | * all possible combinations of pages from the different mirrors |
| 867 | * until the checksum verification succeeds. For example, when |
| 868 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page |
| 869 | * of mirror #2 is readable but the final checksum test fails, |
| 870 | * then the 2nd page of mirror #3 could be tried, whether now |
| 871 | * the final checksum succeedes. But this would be a rare |
| 872 | * exception and is therefore not implemented. At least it is |
| 873 | * avoided that the good copy is overwritten. |
| 874 | * A more useful improvement would be to pick the sectors |
| 875 | * without I/O error based on sector sizes (512 bytes on legacy |
| 876 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one |
| 877 | * mirror could be repaired by taking 512 byte of a different |
| 878 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE |
| 879 | * area are unreadable. |
| 880 | */ |
| 881 | |
| 882 | /* can only fix I/O errors from here on */ |
| 883 | if (sblock_bad->no_io_error_seen) |
| 884 | goto did_not_correct_error; |
| 885 | |
| 886 | success = 1; |
| 887 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
| 888 | struct scrub_page *page_bad = sblock_bad->pagev + page_num; |
| 889 | |
| 890 | if (!page_bad->io_error) |
| 891 | continue; |
| 892 | |
| 893 | for (mirror_index = 0; |
| 894 | mirror_index < BTRFS_MAX_MIRRORS && |
| 895 | sblocks_for_recheck[mirror_index].page_count > 0; |
| 896 | mirror_index++) { |
| 897 | struct scrub_block *sblock_other = sblocks_for_recheck + |
| 898 | mirror_index; |
| 899 | struct scrub_page *page_other = sblock_other->pagev + |
| 900 | page_num; |
| 901 | |
| 902 | if (!page_other->io_error) { |
| 903 | ret = scrub_repair_page_from_good_copy( |
| 904 | sblock_bad, sblock_other, page_num, 0); |
| 905 | if (0 == ret) { |
| 906 | page_bad->io_error = 0; |
| 907 | break; /* succeeded for this page */ |
| 908 | } |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 909 | } |
| 910 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 911 | |
| 912 | if (page_bad->io_error) { |
| 913 | /* did not find a mirror to copy the page from */ |
| 914 | success = 0; |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | if (success) { |
| 919 | if (is_metadata || have_csum) { |
| 920 | /* |
| 921 | * need to verify the checksum now that all |
| 922 | * sectors on disk are repaired (the write |
| 923 | * request for data to be repaired is on its way). |
| 924 | * Just be lazy and use scrub_recheck_block() |
| 925 | * which re-reads the data before the checksum |
| 926 | * is verified, but most likely the data comes out |
| 927 | * of the page cache. |
| 928 | */ |
| 929 | ret = scrub_recheck_block(fs_info, sblock_bad, |
| 930 | is_metadata, have_csum, csum, |
| 931 | generation, sdev->csum_size); |
| 932 | if (!ret && !sblock_bad->header_error && |
| 933 | !sblock_bad->checksum_error && |
| 934 | sblock_bad->no_io_error_seen) |
| 935 | goto corrected_error; |
| 936 | else |
| 937 | goto did_not_correct_error; |
| 938 | } else { |
| 939 | corrected_error: |
| 940 | spin_lock(&sdev->stat_lock); |
| 941 | sdev->stat.corrected_errors++; |
| 942 | spin_unlock(&sdev->stat_lock); |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 943 | printk_ratelimited_in_rcu(KERN_ERR |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 944 | "btrfs: fixed up error at logical %llu on dev %s\n", |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 945 | (unsigned long long)logical, |
| 946 | rcu_str_deref(sdev->dev->name)); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 947 | } |
| 948 | } else { |
| 949 | did_not_correct_error: |
| 950 | spin_lock(&sdev->stat_lock); |
| 951 | sdev->stat.uncorrectable_errors++; |
| 952 | spin_unlock(&sdev->stat_lock); |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 953 | printk_ratelimited_in_rcu(KERN_ERR |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 954 | "btrfs: unable to fixup (regular) error at logical %llu on dev %s\n", |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 955 | (unsigned long long)logical, |
| 956 | rcu_str_deref(sdev->dev->name)); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 957 | } |
| 958 | |
| 959 | out: |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 960 | if (sblocks_for_recheck) { |
| 961 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; |
| 962 | mirror_index++) { |
| 963 | struct scrub_block *sblock = sblocks_for_recheck + |
| 964 | mirror_index; |
| 965 | int page_index; |
| 966 | |
| 967 | for (page_index = 0; page_index < SCRUB_PAGES_PER_BIO; |
| 968 | page_index++) |
| 969 | if (sblock->pagev[page_index].page) |
| 970 | __free_page( |
| 971 | sblock->pagev[page_index].page); |
| 972 | } |
| 973 | kfree(sblocks_for_recheck); |
| 974 | } |
| 975 | |
| 976 | return 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 977 | } |
| 978 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 979 | static int scrub_setup_recheck_block(struct scrub_dev *sdev, |
| 980 | struct btrfs_mapping_tree *map_tree, |
| 981 | u64 length, u64 logical, |
| 982 | struct scrub_block *sblocks_for_recheck) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 983 | { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 984 | int page_index; |
| 985 | int mirror_index; |
| 986 | int ret; |
| 987 | |
| 988 | /* |
| 989 | * note: the three members sdev, ref_count and outstanding_pages |
| 990 | * are not used (and not set) in the blocks that are used for |
| 991 | * the recheck procedure |
| 992 | */ |
| 993 | |
| 994 | page_index = 0; |
| 995 | while (length > 0) { |
| 996 | u64 sublen = min_t(u64, length, PAGE_SIZE); |
| 997 | u64 mapped_length = sublen; |
| 998 | struct btrfs_bio *bbio = NULL; |
| 999 | |
| 1000 | /* |
| 1001 | * with a length of PAGE_SIZE, each returned stripe |
| 1002 | * represents one mirror |
| 1003 | */ |
| 1004 | ret = btrfs_map_block(map_tree, WRITE, logical, &mapped_length, |
| 1005 | &bbio, 0); |
| 1006 | if (ret || !bbio || mapped_length < sublen) { |
| 1007 | kfree(bbio); |
| 1008 | return -EIO; |
| 1009 | } |
| 1010 | |
| 1011 | BUG_ON(page_index >= SCRUB_PAGES_PER_BIO); |
| 1012 | for (mirror_index = 0; mirror_index < (int)bbio->num_stripes; |
| 1013 | mirror_index++) { |
| 1014 | struct scrub_block *sblock; |
| 1015 | struct scrub_page *page; |
| 1016 | |
| 1017 | if (mirror_index >= BTRFS_MAX_MIRRORS) |
| 1018 | continue; |
| 1019 | |
| 1020 | sblock = sblocks_for_recheck + mirror_index; |
| 1021 | page = sblock->pagev + page_index; |
| 1022 | page->logical = logical; |
| 1023 | page->physical = bbio->stripes[mirror_index].physical; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1024 | /* for missing devices, dev->bdev is NULL */ |
| 1025 | page->dev = bbio->stripes[mirror_index].dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1026 | page->mirror_num = mirror_index + 1; |
| 1027 | page->page = alloc_page(GFP_NOFS); |
| 1028 | if (!page->page) { |
| 1029 | spin_lock(&sdev->stat_lock); |
| 1030 | sdev->stat.malloc_errors++; |
| 1031 | spin_unlock(&sdev->stat_lock); |
Wei Yongjun | cf93dcc | 2012-09-02 07:44:51 -0600 | [diff] [blame] | 1032 | kfree(bbio); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1033 | return -ENOMEM; |
| 1034 | } |
| 1035 | sblock->page_count++; |
| 1036 | } |
| 1037 | kfree(bbio); |
| 1038 | length -= sublen; |
| 1039 | logical += sublen; |
| 1040 | page_index++; |
| 1041 | } |
| 1042 | |
| 1043 | return 0; |
| 1044 | } |
| 1045 | |
| 1046 | /* |
| 1047 | * this function will check the on disk data for checksum errors, header |
| 1048 | * errors and read I/O errors. If any I/O errors happen, the exact pages |
| 1049 | * which are errored are marked as being bad. The goal is to enable scrub |
| 1050 | * to take those pages that are not errored from all the mirrors so that |
| 1051 | * the pages that are errored in the just handled mirror can be repaired. |
| 1052 | */ |
| 1053 | static int scrub_recheck_block(struct btrfs_fs_info *fs_info, |
| 1054 | struct scrub_block *sblock, int is_metadata, |
| 1055 | int have_csum, u8 *csum, u64 generation, |
| 1056 | u16 csum_size) |
| 1057 | { |
| 1058 | int page_num; |
| 1059 | |
| 1060 | sblock->no_io_error_seen = 1; |
| 1061 | sblock->header_error = 0; |
| 1062 | sblock->checksum_error = 0; |
| 1063 | |
| 1064 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
| 1065 | struct bio *bio; |
| 1066 | int ret; |
| 1067 | struct scrub_page *page = sblock->pagev + page_num; |
| 1068 | DECLARE_COMPLETION_ONSTACK(complete); |
| 1069 | |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1070 | if (page->dev->bdev == NULL) { |
Stefan Behrens | ea9947b | 2012-05-04 15:16:07 -0400 | [diff] [blame] | 1071 | page->io_error = 1; |
| 1072 | sblock->no_io_error_seen = 0; |
| 1073 | continue; |
| 1074 | } |
| 1075 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1076 | BUG_ON(!page->page); |
| 1077 | bio = bio_alloc(GFP_NOFS, 1); |
Tsutomu Itoh | e627ee7 | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 1078 | if (!bio) |
| 1079 | return -EIO; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1080 | bio->bi_bdev = page->dev->bdev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1081 | bio->bi_sector = page->physical >> 9; |
| 1082 | bio->bi_end_io = scrub_complete_bio_end_io; |
| 1083 | bio->bi_private = &complete; |
| 1084 | |
| 1085 | ret = bio_add_page(bio, page->page, PAGE_SIZE, 0); |
| 1086 | if (PAGE_SIZE != ret) { |
| 1087 | bio_put(bio); |
| 1088 | return -EIO; |
| 1089 | } |
| 1090 | btrfsic_submit_bio(READ, bio); |
| 1091 | |
| 1092 | /* this will also unplug the queue */ |
| 1093 | wait_for_completion(&complete); |
| 1094 | |
| 1095 | page->io_error = !test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 1096 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) |
| 1097 | sblock->no_io_error_seen = 0; |
| 1098 | bio_put(bio); |
| 1099 | } |
| 1100 | |
| 1101 | if (sblock->no_io_error_seen) |
| 1102 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, |
| 1103 | have_csum, csum, generation, |
| 1104 | csum_size); |
| 1105 | |
| 1106 | return 0; |
| 1107 | } |
| 1108 | |
| 1109 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
| 1110 | struct scrub_block *sblock, |
| 1111 | int is_metadata, int have_csum, |
| 1112 | const u8 *csum, u64 generation, |
| 1113 | u16 csum_size) |
| 1114 | { |
| 1115 | int page_num; |
| 1116 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
| 1117 | u32 crc = ~(u32)0; |
| 1118 | struct btrfs_root *root = fs_info->extent_root; |
| 1119 | void *mapped_buffer; |
| 1120 | |
| 1121 | BUG_ON(!sblock->pagev[0].page); |
| 1122 | if (is_metadata) { |
| 1123 | struct btrfs_header *h; |
| 1124 | |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1125 | mapped_buffer = kmap_atomic(sblock->pagev[0].page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1126 | h = (struct btrfs_header *)mapped_buffer; |
| 1127 | |
| 1128 | if (sblock->pagev[0].logical != le64_to_cpu(h->bytenr) || |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1129 | memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE) || |
| 1130 | memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1131 | BTRFS_UUID_SIZE)) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1132 | sblock->header_error = 1; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1133 | } else if (generation != le64_to_cpu(h->generation)) { |
| 1134 | sblock->header_error = 1; |
| 1135 | sblock->generation_error = 1; |
| 1136 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1137 | csum = h->csum; |
| 1138 | } else { |
| 1139 | if (!have_csum) |
| 1140 | return; |
| 1141 | |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1142 | mapped_buffer = kmap_atomic(sblock->pagev[0].page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1143 | } |
| 1144 | |
| 1145 | for (page_num = 0;;) { |
| 1146 | if (page_num == 0 && is_metadata) |
| 1147 | crc = btrfs_csum_data(root, |
| 1148 | ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE, |
| 1149 | crc, PAGE_SIZE - BTRFS_CSUM_SIZE); |
| 1150 | else |
| 1151 | crc = btrfs_csum_data(root, mapped_buffer, crc, |
| 1152 | PAGE_SIZE); |
| 1153 | |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1154 | kunmap_atomic(mapped_buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1155 | page_num++; |
| 1156 | if (page_num >= sblock->page_count) |
| 1157 | break; |
| 1158 | BUG_ON(!sblock->pagev[page_num].page); |
| 1159 | |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1160 | mapped_buffer = kmap_atomic(sblock->pagev[page_num].page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1161 | } |
| 1162 | |
| 1163 | btrfs_csum_final(crc, calculated_csum); |
| 1164 | if (memcmp(calculated_csum, csum, csum_size)) |
| 1165 | sblock->checksum_error = 1; |
| 1166 | } |
| 1167 | |
| 1168 | static void scrub_complete_bio_end_io(struct bio *bio, int err) |
| 1169 | { |
| 1170 | complete((struct completion *)bio->bi_private); |
| 1171 | } |
| 1172 | |
| 1173 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
| 1174 | struct scrub_block *sblock_good, |
| 1175 | int force_write) |
| 1176 | { |
| 1177 | int page_num; |
| 1178 | int ret = 0; |
| 1179 | |
| 1180 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
| 1181 | int ret_sub; |
| 1182 | |
| 1183 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
| 1184 | sblock_good, |
| 1185 | page_num, |
| 1186 | force_write); |
| 1187 | if (ret_sub) |
| 1188 | ret = ret_sub; |
| 1189 | } |
| 1190 | |
| 1191 | return ret; |
| 1192 | } |
| 1193 | |
| 1194 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
| 1195 | struct scrub_block *sblock_good, |
| 1196 | int page_num, int force_write) |
| 1197 | { |
| 1198 | struct scrub_page *page_bad = sblock_bad->pagev + page_num; |
| 1199 | struct scrub_page *page_good = sblock_good->pagev + page_num; |
| 1200 | |
| 1201 | BUG_ON(sblock_bad->pagev[page_num].page == NULL); |
| 1202 | BUG_ON(sblock_good->pagev[page_num].page == NULL); |
| 1203 | if (force_write || sblock_bad->header_error || |
| 1204 | sblock_bad->checksum_error || page_bad->io_error) { |
| 1205 | struct bio *bio; |
| 1206 | int ret; |
| 1207 | DECLARE_COMPLETION_ONSTACK(complete); |
| 1208 | |
| 1209 | bio = bio_alloc(GFP_NOFS, 1); |
Tsutomu Itoh | e627ee7 | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 1210 | if (!bio) |
| 1211 | return -EIO; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1212 | bio->bi_bdev = page_bad->dev->bdev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1213 | bio->bi_sector = page_bad->physical >> 9; |
| 1214 | bio->bi_end_io = scrub_complete_bio_end_io; |
| 1215 | bio->bi_private = &complete; |
| 1216 | |
| 1217 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); |
| 1218 | if (PAGE_SIZE != ret) { |
| 1219 | bio_put(bio); |
| 1220 | return -EIO; |
| 1221 | } |
| 1222 | btrfsic_submit_bio(WRITE, bio); |
| 1223 | |
| 1224 | /* this will also unplug the queue */ |
| 1225 | wait_for_completion(&complete); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1226 | if (!bio_flagged(bio, BIO_UPTODATE)) { |
| 1227 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
| 1228 | BTRFS_DEV_STAT_WRITE_ERRS); |
| 1229 | bio_put(bio); |
| 1230 | return -EIO; |
| 1231 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1232 | bio_put(bio); |
| 1233 | } |
| 1234 | |
| 1235 | return 0; |
| 1236 | } |
| 1237 | |
| 1238 | static void scrub_checksum(struct scrub_block *sblock) |
| 1239 | { |
| 1240 | u64 flags; |
| 1241 | int ret; |
| 1242 | |
| 1243 | BUG_ON(sblock->page_count < 1); |
| 1244 | flags = sblock->pagev[0].flags; |
| 1245 | ret = 0; |
| 1246 | if (flags & BTRFS_EXTENT_FLAG_DATA) |
| 1247 | ret = scrub_checksum_data(sblock); |
| 1248 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) |
| 1249 | ret = scrub_checksum_tree_block(sblock); |
| 1250 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) |
| 1251 | (void)scrub_checksum_super(sblock); |
| 1252 | else |
| 1253 | WARN_ON(1); |
| 1254 | if (ret) |
| 1255 | scrub_handle_errored_block(sblock); |
| 1256 | } |
| 1257 | |
| 1258 | static int scrub_checksum_data(struct scrub_block *sblock) |
| 1259 | { |
| 1260 | struct scrub_dev *sdev = sblock->sdev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1261 | u8 csum[BTRFS_CSUM_SIZE]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1262 | u8 *on_disk_csum; |
| 1263 | struct page *page; |
| 1264 | void *buffer; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1265 | u32 crc = ~(u32)0; |
| 1266 | int fail = 0; |
| 1267 | struct btrfs_root *root = sdev->dev->dev_root; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1268 | u64 len; |
| 1269 | int index; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1270 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1271 | BUG_ON(sblock->page_count < 1); |
| 1272 | if (!sblock->pagev[0].have_csum) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1273 | return 0; |
| 1274 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1275 | on_disk_csum = sblock->pagev[0].csum; |
| 1276 | page = sblock->pagev[0].page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1277 | buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1278 | |
| 1279 | len = sdev->sectorsize; |
| 1280 | index = 0; |
| 1281 | for (;;) { |
| 1282 | u64 l = min_t(u64, len, PAGE_SIZE); |
| 1283 | |
| 1284 | crc = btrfs_csum_data(root, buffer, crc, l); |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1285 | kunmap_atomic(buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1286 | len -= l; |
| 1287 | if (len == 0) |
| 1288 | break; |
| 1289 | index++; |
| 1290 | BUG_ON(index >= sblock->page_count); |
| 1291 | BUG_ON(!sblock->pagev[index].page); |
| 1292 | page = sblock->pagev[index].page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1293 | buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1294 | } |
| 1295 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1296 | btrfs_csum_final(crc, csum); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1297 | if (memcmp(csum, on_disk_csum, sdev->csum_size)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1298 | fail = 1; |
| 1299 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1300 | return fail; |
| 1301 | } |
| 1302 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1303 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1304 | { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1305 | struct scrub_dev *sdev = sblock->sdev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1306 | struct btrfs_header *h; |
| 1307 | struct btrfs_root *root = sdev->dev->dev_root; |
| 1308 | struct btrfs_fs_info *fs_info = root->fs_info; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1309 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
| 1310 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; |
| 1311 | struct page *page; |
| 1312 | void *mapped_buffer; |
| 1313 | u64 mapped_size; |
| 1314 | void *p; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1315 | u32 crc = ~(u32)0; |
| 1316 | int fail = 0; |
| 1317 | int crc_fail = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1318 | u64 len; |
| 1319 | int index; |
| 1320 | |
| 1321 | BUG_ON(sblock->page_count < 1); |
| 1322 | page = sblock->pagev[0].page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1323 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1324 | h = (struct btrfs_header *)mapped_buffer; |
| 1325 | memcpy(on_disk_csum, h->csum, sdev->csum_size); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1326 | |
| 1327 | /* |
| 1328 | * we don't use the getter functions here, as we |
| 1329 | * a) don't have an extent buffer and |
| 1330 | * b) the page is already kmapped |
| 1331 | */ |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1332 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1333 | if (sblock->pagev[0].logical != le64_to_cpu(h->bytenr)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1334 | ++fail; |
| 1335 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1336 | if (sblock->pagev[0].generation != le64_to_cpu(h->generation)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1337 | ++fail; |
| 1338 | |
| 1339 | if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) |
| 1340 | ++fail; |
| 1341 | |
| 1342 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
| 1343 | BTRFS_UUID_SIZE)) |
| 1344 | ++fail; |
| 1345 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1346 | BUG_ON(sdev->nodesize != sdev->leafsize); |
| 1347 | len = sdev->nodesize - BTRFS_CSUM_SIZE; |
| 1348 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
| 1349 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; |
| 1350 | index = 0; |
| 1351 | for (;;) { |
| 1352 | u64 l = min_t(u64, len, mapped_size); |
| 1353 | |
| 1354 | crc = btrfs_csum_data(root, p, crc, l); |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1355 | kunmap_atomic(mapped_buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1356 | len -= l; |
| 1357 | if (len == 0) |
| 1358 | break; |
| 1359 | index++; |
| 1360 | BUG_ON(index >= sblock->page_count); |
| 1361 | BUG_ON(!sblock->pagev[index].page); |
| 1362 | page = sblock->pagev[index].page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1363 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1364 | mapped_size = PAGE_SIZE; |
| 1365 | p = mapped_buffer; |
| 1366 | } |
| 1367 | |
| 1368 | btrfs_csum_final(crc, calculated_csum); |
| 1369 | if (memcmp(calculated_csum, on_disk_csum, sdev->csum_size)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1370 | ++crc_fail; |
| 1371 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1372 | return fail || crc_fail; |
| 1373 | } |
| 1374 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1375 | static int scrub_checksum_super(struct scrub_block *sblock) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1376 | { |
| 1377 | struct btrfs_super_block *s; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1378 | struct scrub_dev *sdev = sblock->sdev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1379 | struct btrfs_root *root = sdev->dev->dev_root; |
| 1380 | struct btrfs_fs_info *fs_info = root->fs_info; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1381 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
| 1382 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; |
| 1383 | struct page *page; |
| 1384 | void *mapped_buffer; |
| 1385 | u64 mapped_size; |
| 1386 | void *p; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1387 | u32 crc = ~(u32)0; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1388 | int fail_gen = 0; |
| 1389 | int fail_cor = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1390 | u64 len; |
| 1391 | int index; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1392 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1393 | BUG_ON(sblock->page_count < 1); |
| 1394 | page = sblock->pagev[0].page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1395 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1396 | s = (struct btrfs_super_block *)mapped_buffer; |
| 1397 | memcpy(on_disk_csum, s->csum, sdev->csum_size); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1398 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1399 | if (sblock->pagev[0].logical != le64_to_cpu(s->bytenr)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1400 | ++fail_cor; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1401 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1402 | if (sblock->pagev[0].generation != le64_to_cpu(s->generation)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1403 | ++fail_gen; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1404 | |
| 1405 | if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1406 | ++fail_cor; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1407 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1408 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
| 1409 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
| 1410 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; |
| 1411 | index = 0; |
| 1412 | for (;;) { |
| 1413 | u64 l = min_t(u64, len, mapped_size); |
| 1414 | |
| 1415 | crc = btrfs_csum_data(root, p, crc, l); |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1416 | kunmap_atomic(mapped_buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1417 | len -= l; |
| 1418 | if (len == 0) |
| 1419 | break; |
| 1420 | index++; |
| 1421 | BUG_ON(index >= sblock->page_count); |
| 1422 | BUG_ON(!sblock->pagev[index].page); |
| 1423 | page = sblock->pagev[index].page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1424 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1425 | mapped_size = PAGE_SIZE; |
| 1426 | p = mapped_buffer; |
| 1427 | } |
| 1428 | |
| 1429 | btrfs_csum_final(crc, calculated_csum); |
| 1430 | if (memcmp(calculated_csum, on_disk_csum, sdev->csum_size)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1431 | ++fail_cor; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1432 | |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1433 | if (fail_cor + fail_gen) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1434 | /* |
| 1435 | * if we find an error in a super block, we just report it. |
| 1436 | * They will get written with the next transaction commit |
| 1437 | * anyway |
| 1438 | */ |
| 1439 | spin_lock(&sdev->stat_lock); |
| 1440 | ++sdev->stat.super_errors; |
| 1441 | spin_unlock(&sdev->stat_lock); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1442 | if (fail_cor) |
| 1443 | btrfs_dev_stat_inc_and_print(sdev->dev, |
| 1444 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
| 1445 | else |
| 1446 | btrfs_dev_stat_inc_and_print(sdev->dev, |
| 1447 | BTRFS_DEV_STAT_GENERATION_ERRS); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1448 | } |
| 1449 | |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1450 | return fail_cor + fail_gen; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1451 | } |
| 1452 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1453 | static void scrub_block_get(struct scrub_block *sblock) |
| 1454 | { |
| 1455 | atomic_inc(&sblock->ref_count); |
| 1456 | } |
| 1457 | |
| 1458 | static void scrub_block_put(struct scrub_block *sblock) |
| 1459 | { |
| 1460 | if (atomic_dec_and_test(&sblock->ref_count)) { |
| 1461 | int i; |
| 1462 | |
| 1463 | for (i = 0; i < sblock->page_count; i++) |
| 1464 | if (sblock->pagev[i].page) |
| 1465 | __free_page(sblock->pagev[i].page); |
| 1466 | kfree(sblock); |
| 1467 | } |
| 1468 | } |
| 1469 | |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 1470 | static void scrub_submit(struct scrub_dev *sdev) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1471 | { |
| 1472 | struct scrub_bio *sbio; |
| 1473 | |
| 1474 | if (sdev->curr == -1) |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 1475 | return; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1476 | |
| 1477 | sbio = sdev->bios[sdev->curr]; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1478 | sdev->curr = -1; |
| 1479 | atomic_inc(&sdev->in_flight); |
| 1480 | |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 1481 | btrfsic_submit_bio(READ, sbio->bio); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1482 | } |
| 1483 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1484 | static int scrub_add_page_to_bio(struct scrub_dev *sdev, |
| 1485 | struct scrub_page *spage) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1486 | { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1487 | struct scrub_block *sblock = spage->sblock; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1488 | struct scrub_bio *sbio; |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1489 | int ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1490 | |
| 1491 | again: |
| 1492 | /* |
| 1493 | * grab a fresh bio or wait for one to become available |
| 1494 | */ |
| 1495 | while (sdev->curr == -1) { |
| 1496 | spin_lock(&sdev->list_lock); |
| 1497 | sdev->curr = sdev->first_free; |
| 1498 | if (sdev->curr != -1) { |
| 1499 | sdev->first_free = sdev->bios[sdev->curr]->next_free; |
| 1500 | sdev->bios[sdev->curr]->next_free = -1; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1501 | sdev->bios[sdev->curr]->page_count = 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1502 | spin_unlock(&sdev->list_lock); |
| 1503 | } else { |
| 1504 | spin_unlock(&sdev->list_lock); |
| 1505 | wait_event(sdev->list_wait, sdev->first_free != -1); |
| 1506 | } |
| 1507 | } |
| 1508 | sbio = sdev->bios[sdev->curr]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1509 | if (sbio->page_count == 0) { |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1510 | struct bio *bio; |
| 1511 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1512 | sbio->physical = spage->physical; |
| 1513 | sbio->logical = spage->logical; |
| 1514 | bio = sbio->bio; |
| 1515 | if (!bio) { |
| 1516 | bio = bio_alloc(GFP_NOFS, sdev->pages_per_bio); |
| 1517 | if (!bio) |
| 1518 | return -ENOMEM; |
| 1519 | sbio->bio = bio; |
| 1520 | } |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1521 | |
| 1522 | bio->bi_private = sbio; |
| 1523 | bio->bi_end_io = scrub_bio_end_io; |
| 1524 | bio->bi_bdev = sdev->dev->bdev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1525 | bio->bi_sector = spage->physical >> 9; |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1526 | sbio->err = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1527 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
| 1528 | spage->physical || |
| 1529 | sbio->logical + sbio->page_count * PAGE_SIZE != |
| 1530 | spage->logical) { |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 1531 | scrub_submit(sdev); |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1532 | goto again; |
| 1533 | } |
| 1534 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1535 | sbio->pagev[sbio->page_count] = spage; |
| 1536 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); |
| 1537 | if (ret != PAGE_SIZE) { |
| 1538 | if (sbio->page_count < 1) { |
| 1539 | bio_put(sbio->bio); |
| 1540 | sbio->bio = NULL; |
| 1541 | return -EIO; |
| 1542 | } |
| 1543 | scrub_submit(sdev); |
| 1544 | goto again; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1545 | } |
Arne Jansen | 1bc8779 | 2011-05-28 21:57:55 +0200 | [diff] [blame] | 1546 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1547 | scrub_block_get(sblock); /* one for the added page */ |
| 1548 | atomic_inc(&sblock->outstanding_pages); |
| 1549 | sbio->page_count++; |
| 1550 | if (sbio->page_count == sdev->pages_per_bio) |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 1551 | scrub_submit(sdev); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1552 | |
| 1553 | return 0; |
| 1554 | } |
| 1555 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1556 | static int scrub_pages(struct scrub_dev *sdev, u64 logical, u64 len, |
| 1557 | u64 physical, u64 flags, u64 gen, int mirror_num, |
| 1558 | u8 *csum, int force) |
| 1559 | { |
| 1560 | struct scrub_block *sblock; |
| 1561 | int index; |
| 1562 | |
| 1563 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); |
| 1564 | if (!sblock) { |
| 1565 | spin_lock(&sdev->stat_lock); |
| 1566 | sdev->stat.malloc_errors++; |
| 1567 | spin_unlock(&sdev->stat_lock); |
| 1568 | return -ENOMEM; |
| 1569 | } |
| 1570 | |
| 1571 | /* one ref inside this function, plus one for each page later on */ |
| 1572 | atomic_set(&sblock->ref_count, 1); |
| 1573 | sblock->sdev = sdev; |
| 1574 | sblock->no_io_error_seen = 1; |
| 1575 | |
| 1576 | for (index = 0; len > 0; index++) { |
| 1577 | struct scrub_page *spage = sblock->pagev + index; |
| 1578 | u64 l = min_t(u64, len, PAGE_SIZE); |
| 1579 | |
| 1580 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
| 1581 | spage->page = alloc_page(GFP_NOFS); |
| 1582 | if (!spage->page) { |
| 1583 | spin_lock(&sdev->stat_lock); |
| 1584 | sdev->stat.malloc_errors++; |
| 1585 | spin_unlock(&sdev->stat_lock); |
| 1586 | while (index > 0) { |
| 1587 | index--; |
| 1588 | __free_page(sblock->pagev[index].page); |
| 1589 | } |
| 1590 | kfree(sblock); |
| 1591 | return -ENOMEM; |
| 1592 | } |
| 1593 | spage->sblock = sblock; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1594 | spage->dev = sdev->dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1595 | spage->flags = flags; |
| 1596 | spage->generation = gen; |
| 1597 | spage->logical = logical; |
| 1598 | spage->physical = physical; |
| 1599 | spage->mirror_num = mirror_num; |
| 1600 | if (csum) { |
| 1601 | spage->have_csum = 1; |
| 1602 | memcpy(spage->csum, csum, sdev->csum_size); |
| 1603 | } else { |
| 1604 | spage->have_csum = 0; |
| 1605 | } |
| 1606 | sblock->page_count++; |
| 1607 | len -= l; |
| 1608 | logical += l; |
| 1609 | physical += l; |
| 1610 | } |
| 1611 | |
| 1612 | BUG_ON(sblock->page_count == 0); |
| 1613 | for (index = 0; index < sblock->page_count; index++) { |
| 1614 | struct scrub_page *spage = sblock->pagev + index; |
| 1615 | int ret; |
| 1616 | |
| 1617 | ret = scrub_add_page_to_bio(sdev, spage); |
| 1618 | if (ret) { |
| 1619 | scrub_block_put(sblock); |
| 1620 | return ret; |
| 1621 | } |
| 1622 | } |
| 1623 | |
| 1624 | if (force) |
| 1625 | scrub_submit(sdev); |
| 1626 | |
| 1627 | /* last one frees, either here or in bio completion for last page */ |
| 1628 | scrub_block_put(sblock); |
| 1629 | return 0; |
| 1630 | } |
| 1631 | |
| 1632 | static void scrub_bio_end_io(struct bio *bio, int err) |
| 1633 | { |
| 1634 | struct scrub_bio *sbio = bio->bi_private; |
| 1635 | struct scrub_dev *sdev = sbio->sdev; |
| 1636 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; |
| 1637 | |
| 1638 | sbio->err = err; |
| 1639 | sbio->bio = bio; |
| 1640 | |
| 1641 | btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work); |
| 1642 | } |
| 1643 | |
| 1644 | static void scrub_bio_end_io_worker(struct btrfs_work *work) |
| 1645 | { |
| 1646 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); |
| 1647 | struct scrub_dev *sdev = sbio->sdev; |
| 1648 | int i; |
| 1649 | |
| 1650 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_BIO); |
| 1651 | if (sbio->err) { |
| 1652 | for (i = 0; i < sbio->page_count; i++) { |
| 1653 | struct scrub_page *spage = sbio->pagev[i]; |
| 1654 | |
| 1655 | spage->io_error = 1; |
| 1656 | spage->sblock->no_io_error_seen = 0; |
| 1657 | } |
| 1658 | } |
| 1659 | |
| 1660 | /* now complete the scrub_block items that have all pages completed */ |
| 1661 | for (i = 0; i < sbio->page_count; i++) { |
| 1662 | struct scrub_page *spage = sbio->pagev[i]; |
| 1663 | struct scrub_block *sblock = spage->sblock; |
| 1664 | |
| 1665 | if (atomic_dec_and_test(&sblock->outstanding_pages)) |
| 1666 | scrub_block_complete(sblock); |
| 1667 | scrub_block_put(sblock); |
| 1668 | } |
| 1669 | |
| 1670 | if (sbio->err) { |
| 1671 | /* what is this good for??? */ |
| 1672 | sbio->bio->bi_flags &= ~(BIO_POOL_MASK - 1); |
| 1673 | sbio->bio->bi_flags |= 1 << BIO_UPTODATE; |
| 1674 | sbio->bio->bi_phys_segments = 0; |
| 1675 | sbio->bio->bi_idx = 0; |
| 1676 | |
| 1677 | for (i = 0; i < sbio->page_count; i++) { |
| 1678 | struct bio_vec *bi; |
| 1679 | bi = &sbio->bio->bi_io_vec[i]; |
| 1680 | bi->bv_offset = 0; |
| 1681 | bi->bv_len = PAGE_SIZE; |
| 1682 | } |
| 1683 | } |
| 1684 | |
| 1685 | bio_put(sbio->bio); |
| 1686 | sbio->bio = NULL; |
| 1687 | spin_lock(&sdev->list_lock); |
| 1688 | sbio->next_free = sdev->first_free; |
| 1689 | sdev->first_free = sbio->index; |
| 1690 | spin_unlock(&sdev->list_lock); |
| 1691 | atomic_dec(&sdev->in_flight); |
| 1692 | wake_up(&sdev->list_wait); |
| 1693 | } |
| 1694 | |
| 1695 | static void scrub_block_complete(struct scrub_block *sblock) |
| 1696 | { |
| 1697 | if (!sblock->no_io_error_seen) |
| 1698 | scrub_handle_errored_block(sblock); |
| 1699 | else |
| 1700 | scrub_checksum(sblock); |
| 1701 | } |
| 1702 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1703 | static int scrub_find_csum(struct scrub_dev *sdev, u64 logical, u64 len, |
| 1704 | u8 *csum) |
| 1705 | { |
| 1706 | struct btrfs_ordered_sum *sum = NULL; |
| 1707 | int ret = 0; |
| 1708 | unsigned long i; |
| 1709 | unsigned long num_sectors; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1710 | |
| 1711 | while (!list_empty(&sdev->csum_list)) { |
| 1712 | sum = list_first_entry(&sdev->csum_list, |
| 1713 | struct btrfs_ordered_sum, list); |
| 1714 | if (sum->bytenr > logical) |
| 1715 | return 0; |
| 1716 | if (sum->bytenr + sum->len > logical) |
| 1717 | break; |
| 1718 | |
| 1719 | ++sdev->stat.csum_discards; |
| 1720 | list_del(&sum->list); |
| 1721 | kfree(sum); |
| 1722 | sum = NULL; |
| 1723 | } |
| 1724 | if (!sum) |
| 1725 | return 0; |
| 1726 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1727 | num_sectors = sum->len / sdev->sectorsize; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1728 | for (i = 0; i < num_sectors; ++i) { |
| 1729 | if (sum->sums[i].bytenr == logical) { |
| 1730 | memcpy(csum, &sum->sums[i].sum, sdev->csum_size); |
| 1731 | ret = 1; |
| 1732 | break; |
| 1733 | } |
| 1734 | } |
| 1735 | if (ret && i == num_sectors - 1) { |
| 1736 | list_del(&sum->list); |
| 1737 | kfree(sum); |
| 1738 | } |
| 1739 | return ret; |
| 1740 | } |
| 1741 | |
| 1742 | /* scrub extent tries to collect up to 64 kB for each bio */ |
| 1743 | static int scrub_extent(struct scrub_dev *sdev, u64 logical, u64 len, |
Jan Schmidt | e12fa9c | 2011-06-17 15:55:21 +0200 | [diff] [blame] | 1744 | u64 physical, u64 flags, u64 gen, int mirror_num) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1745 | { |
| 1746 | int ret; |
| 1747 | u8 csum[BTRFS_CSUM_SIZE]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1748 | u32 blocksize; |
| 1749 | |
| 1750 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
| 1751 | blocksize = sdev->sectorsize; |
| 1752 | spin_lock(&sdev->stat_lock); |
| 1753 | sdev->stat.data_extents_scrubbed++; |
| 1754 | sdev->stat.data_bytes_scrubbed += len; |
| 1755 | spin_unlock(&sdev->stat_lock); |
| 1756 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
| 1757 | BUG_ON(sdev->nodesize != sdev->leafsize); |
| 1758 | blocksize = sdev->nodesize; |
| 1759 | spin_lock(&sdev->stat_lock); |
| 1760 | sdev->stat.tree_extents_scrubbed++; |
| 1761 | sdev->stat.tree_bytes_scrubbed += len; |
| 1762 | spin_unlock(&sdev->stat_lock); |
| 1763 | } else { |
| 1764 | blocksize = sdev->sectorsize; |
| 1765 | BUG_ON(1); |
| 1766 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1767 | |
| 1768 | while (len) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1769 | u64 l = min_t(u64, len, blocksize); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1770 | int have_csum = 0; |
| 1771 | |
| 1772 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
| 1773 | /* push csums to sbio */ |
| 1774 | have_csum = scrub_find_csum(sdev, logical, l, csum); |
| 1775 | if (have_csum == 0) |
| 1776 | ++sdev->stat.no_csum; |
| 1777 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1778 | ret = scrub_pages(sdev, logical, l, physical, flags, gen, |
| 1779 | mirror_num, have_csum ? csum : NULL, 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1780 | if (ret) |
| 1781 | return ret; |
| 1782 | len -= l; |
| 1783 | logical += l; |
| 1784 | physical += l; |
| 1785 | } |
| 1786 | return 0; |
| 1787 | } |
| 1788 | |
| 1789 | static noinline_for_stack int scrub_stripe(struct scrub_dev *sdev, |
| 1790 | struct map_lookup *map, int num, u64 base, u64 length) |
| 1791 | { |
| 1792 | struct btrfs_path *path; |
| 1793 | struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info; |
| 1794 | struct btrfs_root *root = fs_info->extent_root; |
| 1795 | struct btrfs_root *csum_root = fs_info->csum_root; |
| 1796 | struct btrfs_extent_item *extent; |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 1797 | struct blk_plug plug; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1798 | u64 flags; |
| 1799 | int ret; |
| 1800 | int slot; |
| 1801 | int i; |
| 1802 | u64 nstripes; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1803 | struct extent_buffer *l; |
| 1804 | struct btrfs_key key; |
| 1805 | u64 physical; |
| 1806 | u64 logical; |
| 1807 | u64 generation; |
Jan Schmidt | e12fa9c | 2011-06-17 15:55:21 +0200 | [diff] [blame] | 1808 | int mirror_num; |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1809 | struct reada_control *reada1; |
| 1810 | struct reada_control *reada2; |
| 1811 | struct btrfs_key key_start; |
| 1812 | struct btrfs_key key_end; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1813 | |
| 1814 | u64 increment = map->stripe_len; |
| 1815 | u64 offset; |
| 1816 | |
| 1817 | nstripes = length; |
| 1818 | offset = 0; |
| 1819 | do_div(nstripes, map->stripe_len); |
| 1820 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
| 1821 | offset = map->stripe_len * num; |
| 1822 | increment = map->stripe_len * map->num_stripes; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1823 | mirror_num = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1824 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
| 1825 | int factor = map->num_stripes / map->sub_stripes; |
| 1826 | offset = map->stripe_len * (num / map->sub_stripes); |
| 1827 | increment = map->stripe_len * factor; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1828 | mirror_num = num % map->sub_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1829 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
| 1830 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1831 | mirror_num = num % map->num_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1832 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
| 1833 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1834 | mirror_num = num % map->num_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1835 | } else { |
| 1836 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 1837 | mirror_num = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1838 | } |
| 1839 | |
| 1840 | path = btrfs_alloc_path(); |
| 1841 | if (!path) |
| 1842 | return -ENOMEM; |
| 1843 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1844 | /* |
| 1845 | * work on commit root. The related disk blocks are static as |
| 1846 | * long as COW is applied. This means, it is save to rewrite |
| 1847 | * them to repair disk errors without any race conditions |
| 1848 | */ |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1849 | path->search_commit_root = 1; |
| 1850 | path->skip_locking = 1; |
| 1851 | |
| 1852 | /* |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1853 | * trigger the readahead for extent tree csum tree and wait for |
| 1854 | * completion. During readahead, the scrub is officially paused |
| 1855 | * to not hold off transaction commits |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1856 | */ |
| 1857 | logical = base + offset; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1858 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1859 | wait_event(sdev->list_wait, |
| 1860 | atomic_read(&sdev->in_flight) == 0); |
| 1861 | atomic_inc(&fs_info->scrubs_paused); |
| 1862 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1863 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1864 | /* FIXME it might be better to start readahead at commit root */ |
| 1865 | key_start.objectid = logical; |
| 1866 | key_start.type = BTRFS_EXTENT_ITEM_KEY; |
| 1867 | key_start.offset = (u64)0; |
| 1868 | key_end.objectid = base + offset + nstripes * increment; |
| 1869 | key_end.type = BTRFS_EXTENT_ITEM_KEY; |
| 1870 | key_end.offset = (u64)0; |
| 1871 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1872 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1873 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 1874 | key_start.type = BTRFS_EXTENT_CSUM_KEY; |
| 1875 | key_start.offset = logical; |
| 1876 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 1877 | key_end.type = BTRFS_EXTENT_CSUM_KEY; |
| 1878 | key_end.offset = base + offset + nstripes * increment; |
| 1879 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1880 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1881 | if (!IS_ERR(reada1)) |
| 1882 | btrfs_reada_wait(reada1); |
| 1883 | if (!IS_ERR(reada2)) |
| 1884 | btrfs_reada_wait(reada2); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1885 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1886 | mutex_lock(&fs_info->scrub_lock); |
| 1887 | while (atomic_read(&fs_info->scrub_pause_req)) { |
| 1888 | mutex_unlock(&fs_info->scrub_lock); |
| 1889 | wait_event(fs_info->scrub_pause_wait, |
| 1890 | atomic_read(&fs_info->scrub_pause_req) == 0); |
| 1891 | mutex_lock(&fs_info->scrub_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1892 | } |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1893 | atomic_dec(&fs_info->scrubs_paused); |
| 1894 | mutex_unlock(&fs_info->scrub_lock); |
| 1895 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1896 | |
| 1897 | /* |
| 1898 | * collect all data csums for the stripe to avoid seeking during |
| 1899 | * the scrub. This might currently (crc32) end up to be about 1MB |
| 1900 | */ |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 1901 | blk_start_plug(&plug); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1902 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1903 | /* |
| 1904 | * now find all extents for each stripe and scrub them |
| 1905 | */ |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1906 | logical = base + offset; |
| 1907 | physical = map->stripes[num].physical; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1908 | ret = 0; |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1909 | for (i = 0; i < nstripes; ++i) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1910 | /* |
| 1911 | * canceled? |
| 1912 | */ |
| 1913 | if (atomic_read(&fs_info->scrub_cancel_req) || |
| 1914 | atomic_read(&sdev->cancel_req)) { |
| 1915 | ret = -ECANCELED; |
| 1916 | goto out; |
| 1917 | } |
| 1918 | /* |
| 1919 | * check to see if we have to pause |
| 1920 | */ |
| 1921 | if (atomic_read(&fs_info->scrub_pause_req)) { |
| 1922 | /* push queued extents */ |
| 1923 | scrub_submit(sdev); |
| 1924 | wait_event(sdev->list_wait, |
| 1925 | atomic_read(&sdev->in_flight) == 0); |
| 1926 | atomic_inc(&fs_info->scrubs_paused); |
| 1927 | wake_up(&fs_info->scrub_pause_wait); |
| 1928 | mutex_lock(&fs_info->scrub_lock); |
| 1929 | while (atomic_read(&fs_info->scrub_pause_req)) { |
| 1930 | mutex_unlock(&fs_info->scrub_lock); |
| 1931 | wait_event(fs_info->scrub_pause_wait, |
| 1932 | atomic_read(&fs_info->scrub_pause_req) == 0); |
| 1933 | mutex_lock(&fs_info->scrub_lock); |
| 1934 | } |
| 1935 | atomic_dec(&fs_info->scrubs_paused); |
| 1936 | mutex_unlock(&fs_info->scrub_lock); |
| 1937 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1938 | } |
| 1939 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 1940 | ret = btrfs_lookup_csums_range(csum_root, logical, |
| 1941 | logical + map->stripe_len - 1, |
| 1942 | &sdev->csum_list, 1); |
| 1943 | if (ret) |
| 1944 | goto out; |
| 1945 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1946 | key.objectid = logical; |
| 1947 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 1948 | key.offset = (u64)0; |
| 1949 | |
| 1950 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 1951 | if (ret < 0) |
| 1952 | goto out; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 1953 | if (ret > 0) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1954 | ret = btrfs_previous_item(root, path, 0, |
| 1955 | BTRFS_EXTENT_ITEM_KEY); |
| 1956 | if (ret < 0) |
| 1957 | goto out; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 1958 | if (ret > 0) { |
| 1959 | /* there's no smaller item, so stick with the |
| 1960 | * larger one */ |
| 1961 | btrfs_release_path(path); |
| 1962 | ret = btrfs_search_slot(NULL, root, &key, |
| 1963 | path, 0, 0); |
| 1964 | if (ret < 0) |
| 1965 | goto out; |
| 1966 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1967 | } |
| 1968 | |
| 1969 | while (1) { |
| 1970 | l = path->nodes[0]; |
| 1971 | slot = path->slots[0]; |
| 1972 | if (slot >= btrfs_header_nritems(l)) { |
| 1973 | ret = btrfs_next_leaf(root, path); |
| 1974 | if (ret == 0) |
| 1975 | continue; |
| 1976 | if (ret < 0) |
| 1977 | goto out; |
| 1978 | |
| 1979 | break; |
| 1980 | } |
| 1981 | btrfs_item_key_to_cpu(l, &key, slot); |
| 1982 | |
| 1983 | if (key.objectid + key.offset <= logical) |
| 1984 | goto next; |
| 1985 | |
| 1986 | if (key.objectid >= logical + map->stripe_len) |
| 1987 | break; |
| 1988 | |
| 1989 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) |
| 1990 | goto next; |
| 1991 | |
| 1992 | extent = btrfs_item_ptr(l, slot, |
| 1993 | struct btrfs_extent_item); |
| 1994 | flags = btrfs_extent_flags(l, extent); |
| 1995 | generation = btrfs_extent_generation(l, extent); |
| 1996 | |
| 1997 | if (key.objectid < logical && |
| 1998 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { |
| 1999 | printk(KERN_ERR |
| 2000 | "btrfs scrub: tree block %llu spanning " |
| 2001 | "stripes, ignored. logical=%llu\n", |
| 2002 | (unsigned long long)key.objectid, |
| 2003 | (unsigned long long)logical); |
| 2004 | goto next; |
| 2005 | } |
| 2006 | |
| 2007 | /* |
| 2008 | * trim extent to this stripe |
| 2009 | */ |
| 2010 | if (key.objectid < logical) { |
| 2011 | key.offset -= logical - key.objectid; |
| 2012 | key.objectid = logical; |
| 2013 | } |
| 2014 | if (key.objectid + key.offset > |
| 2015 | logical + map->stripe_len) { |
| 2016 | key.offset = logical + map->stripe_len - |
| 2017 | key.objectid; |
| 2018 | } |
| 2019 | |
| 2020 | ret = scrub_extent(sdev, key.objectid, key.offset, |
| 2021 | key.objectid - logical + physical, |
| 2022 | flags, generation, mirror_num); |
| 2023 | if (ret) |
| 2024 | goto out; |
| 2025 | |
| 2026 | next: |
| 2027 | path->slots[0]++; |
| 2028 | } |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 2029 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2030 | logical += increment; |
| 2031 | physical += map->stripe_len; |
| 2032 | spin_lock(&sdev->stat_lock); |
| 2033 | sdev->stat.last_physical = physical; |
| 2034 | spin_unlock(&sdev->stat_lock); |
| 2035 | } |
| 2036 | /* push queued extents */ |
| 2037 | scrub_submit(sdev); |
| 2038 | |
| 2039 | out: |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 2040 | blk_finish_plug(&plug); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2041 | btrfs_free_path(path); |
| 2042 | return ret < 0 ? ret : 0; |
| 2043 | } |
| 2044 | |
| 2045 | static noinline_for_stack int scrub_chunk(struct scrub_dev *sdev, |
Arne Jansen | 859acaf | 2012-02-09 15:09:02 +0100 | [diff] [blame] | 2046 | u64 chunk_tree, u64 chunk_objectid, u64 chunk_offset, u64 length, |
| 2047 | u64 dev_offset) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2048 | { |
| 2049 | struct btrfs_mapping_tree *map_tree = |
| 2050 | &sdev->dev->dev_root->fs_info->mapping_tree; |
| 2051 | struct map_lookup *map; |
| 2052 | struct extent_map *em; |
| 2053 | int i; |
| 2054 | int ret = -EINVAL; |
| 2055 | |
| 2056 | read_lock(&map_tree->map_tree.lock); |
| 2057 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
| 2058 | read_unlock(&map_tree->map_tree.lock); |
| 2059 | |
| 2060 | if (!em) |
| 2061 | return -EINVAL; |
| 2062 | |
| 2063 | map = (struct map_lookup *)em->bdev; |
| 2064 | if (em->start != chunk_offset) |
| 2065 | goto out; |
| 2066 | |
| 2067 | if (em->len < length) |
| 2068 | goto out; |
| 2069 | |
| 2070 | for (i = 0; i < map->num_stripes; ++i) { |
Arne Jansen | 859acaf | 2012-02-09 15:09:02 +0100 | [diff] [blame] | 2071 | if (map->stripes[i].dev == sdev->dev && |
| 2072 | map->stripes[i].physical == dev_offset) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2073 | ret = scrub_stripe(sdev, map, i, chunk_offset, length); |
| 2074 | if (ret) |
| 2075 | goto out; |
| 2076 | } |
| 2077 | } |
| 2078 | out: |
| 2079 | free_extent_map(em); |
| 2080 | |
| 2081 | return ret; |
| 2082 | } |
| 2083 | |
| 2084 | static noinline_for_stack |
| 2085 | int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end) |
| 2086 | { |
| 2087 | struct btrfs_dev_extent *dev_extent = NULL; |
| 2088 | struct btrfs_path *path; |
| 2089 | struct btrfs_root *root = sdev->dev->dev_root; |
| 2090 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2091 | u64 length; |
| 2092 | u64 chunk_tree; |
| 2093 | u64 chunk_objectid; |
| 2094 | u64 chunk_offset; |
| 2095 | int ret; |
| 2096 | int slot; |
| 2097 | struct extent_buffer *l; |
| 2098 | struct btrfs_key key; |
| 2099 | struct btrfs_key found_key; |
| 2100 | struct btrfs_block_group_cache *cache; |
| 2101 | |
| 2102 | path = btrfs_alloc_path(); |
| 2103 | if (!path) |
| 2104 | return -ENOMEM; |
| 2105 | |
| 2106 | path->reada = 2; |
| 2107 | path->search_commit_root = 1; |
| 2108 | path->skip_locking = 1; |
| 2109 | |
| 2110 | key.objectid = sdev->dev->devid; |
| 2111 | key.offset = 0ull; |
| 2112 | key.type = BTRFS_DEV_EXTENT_KEY; |
| 2113 | |
| 2114 | |
| 2115 | while (1) { |
| 2116 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 2117 | if (ret < 0) |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2118 | break; |
| 2119 | if (ret > 0) { |
| 2120 | if (path->slots[0] >= |
| 2121 | btrfs_header_nritems(path->nodes[0])) { |
| 2122 | ret = btrfs_next_leaf(root, path); |
| 2123 | if (ret) |
| 2124 | break; |
| 2125 | } |
| 2126 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2127 | |
| 2128 | l = path->nodes[0]; |
| 2129 | slot = path->slots[0]; |
| 2130 | |
| 2131 | btrfs_item_key_to_cpu(l, &found_key, slot); |
| 2132 | |
| 2133 | if (found_key.objectid != sdev->dev->devid) |
| 2134 | break; |
| 2135 | |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2136 | if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2137 | break; |
| 2138 | |
| 2139 | if (found_key.offset >= end) |
| 2140 | break; |
| 2141 | |
| 2142 | if (found_key.offset < key.offset) |
| 2143 | break; |
| 2144 | |
| 2145 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
| 2146 | length = btrfs_dev_extent_length(l, dev_extent); |
| 2147 | |
| 2148 | if (found_key.offset + length <= start) { |
| 2149 | key.offset = found_key.offset + length; |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 2150 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2151 | continue; |
| 2152 | } |
| 2153 | |
| 2154 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); |
| 2155 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); |
| 2156 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
| 2157 | |
| 2158 | /* |
| 2159 | * get a reference on the corresponding block group to prevent |
| 2160 | * the chunk from going away while we scrub it |
| 2161 | */ |
| 2162 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); |
| 2163 | if (!cache) { |
| 2164 | ret = -ENOENT; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2165 | break; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2166 | } |
| 2167 | ret = scrub_chunk(sdev, chunk_tree, chunk_objectid, |
Arne Jansen | 859acaf | 2012-02-09 15:09:02 +0100 | [diff] [blame] | 2168 | chunk_offset, length, found_key.offset); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2169 | btrfs_put_block_group(cache); |
| 2170 | if (ret) |
| 2171 | break; |
| 2172 | |
| 2173 | key.offset = found_key.offset + length; |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 2174 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2175 | } |
| 2176 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2177 | btrfs_free_path(path); |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2178 | |
| 2179 | /* |
| 2180 | * ret can still be 1 from search_slot or next_leaf, |
| 2181 | * that's not an error |
| 2182 | */ |
| 2183 | return ret < 0 ? ret : 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2184 | } |
| 2185 | |
| 2186 | static noinline_for_stack int scrub_supers(struct scrub_dev *sdev) |
| 2187 | { |
| 2188 | int i; |
| 2189 | u64 bytenr; |
| 2190 | u64 gen; |
| 2191 | int ret; |
| 2192 | struct btrfs_device *device = sdev->dev; |
| 2193 | struct btrfs_root *root = device->dev_root; |
| 2194 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2195 | if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) |
| 2196 | return -EIO; |
| 2197 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2198 | gen = root->fs_info->last_trans_committed; |
| 2199 | |
| 2200 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| 2201 | bytenr = btrfs_sb_offset(i); |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 2202 | if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2203 | break; |
| 2204 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2205 | ret = scrub_pages(sdev, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
| 2206 | BTRFS_EXTENT_FLAG_SUPER, gen, i, NULL, 1); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2207 | if (ret) |
| 2208 | return ret; |
| 2209 | } |
| 2210 | wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0); |
| 2211 | |
| 2212 | return 0; |
| 2213 | } |
| 2214 | |
| 2215 | /* |
| 2216 | * get a reference count on fs_info->scrub_workers. start worker if necessary |
| 2217 | */ |
| 2218 | static noinline_for_stack int scrub_workers_get(struct btrfs_root *root) |
| 2219 | { |
| 2220 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 2221 | int ret = 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2222 | |
| 2223 | mutex_lock(&fs_info->scrub_lock); |
Arne Jansen | 632dd77 | 2011-06-10 12:07:07 +0200 | [diff] [blame] | 2224 | if (fs_info->scrub_workers_refcnt == 0) { |
| 2225 | btrfs_init_workers(&fs_info->scrub_workers, "scrub", |
| 2226 | fs_info->thread_pool_size, &fs_info->generic_worker); |
| 2227 | fs_info->scrub_workers.idle_thresh = 4; |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 2228 | ret = btrfs_start_workers(&fs_info->scrub_workers); |
| 2229 | if (ret) |
| 2230 | goto out; |
Arne Jansen | 632dd77 | 2011-06-10 12:07:07 +0200 | [diff] [blame] | 2231 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2232 | ++fs_info->scrub_workers_refcnt; |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 2233 | out: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2234 | mutex_unlock(&fs_info->scrub_lock); |
| 2235 | |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 2236 | return ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2237 | } |
| 2238 | |
| 2239 | static noinline_for_stack void scrub_workers_put(struct btrfs_root *root) |
| 2240 | { |
| 2241 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2242 | |
| 2243 | mutex_lock(&fs_info->scrub_lock); |
| 2244 | if (--fs_info->scrub_workers_refcnt == 0) |
| 2245 | btrfs_stop_workers(&fs_info->scrub_workers); |
| 2246 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
| 2247 | mutex_unlock(&fs_info->scrub_lock); |
| 2248 | } |
| 2249 | |
| 2250 | |
| 2251 | 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] | 2252 | struct btrfs_scrub_progress *progress, int readonly) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2253 | { |
| 2254 | struct scrub_dev *sdev; |
| 2255 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2256 | int ret; |
| 2257 | struct btrfs_device *dev; |
| 2258 | |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 2259 | if (btrfs_fs_closing(root->fs_info)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2260 | return -EINVAL; |
| 2261 | |
| 2262 | /* |
| 2263 | * check some assumptions |
| 2264 | */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2265 | if (root->nodesize != root->leafsize) { |
| 2266 | printk(KERN_ERR |
| 2267 | "btrfs_scrub: size assumption nodesize == leafsize (%d == %d) fails\n", |
| 2268 | root->nodesize, root->leafsize); |
| 2269 | return -EINVAL; |
| 2270 | } |
| 2271 | |
| 2272 | if (root->nodesize > BTRFS_STRIPE_LEN) { |
| 2273 | /* |
| 2274 | * in this case scrub is unable to calculate the checksum |
| 2275 | * the way scrub is implemented. Do not handle this |
| 2276 | * situation at all because it won't ever happen. |
| 2277 | */ |
| 2278 | printk(KERN_ERR |
| 2279 | "btrfs_scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails\n", |
| 2280 | root->nodesize, BTRFS_STRIPE_LEN); |
| 2281 | return -EINVAL; |
| 2282 | } |
| 2283 | |
| 2284 | if (root->sectorsize != PAGE_SIZE) { |
| 2285 | /* not supported for data w/o checksums */ |
| 2286 | printk(KERN_ERR |
| 2287 | "btrfs_scrub: size assumption sectorsize != PAGE_SIZE (%d != %lld) fails\n", |
| 2288 | root->sectorsize, (unsigned long long)PAGE_SIZE); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2289 | return -EINVAL; |
| 2290 | } |
| 2291 | |
| 2292 | ret = scrub_workers_get(root); |
| 2293 | if (ret) |
| 2294 | return ret; |
| 2295 | |
| 2296 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
| 2297 | dev = btrfs_find_device(root, devid, NULL, NULL); |
| 2298 | if (!dev || dev->missing) { |
| 2299 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 2300 | scrub_workers_put(root); |
| 2301 | return -ENODEV; |
| 2302 | } |
| 2303 | mutex_lock(&fs_info->scrub_lock); |
| 2304 | |
| 2305 | if (!dev->in_fs_metadata) { |
| 2306 | mutex_unlock(&fs_info->scrub_lock); |
| 2307 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 2308 | scrub_workers_put(root); |
| 2309 | return -ENODEV; |
| 2310 | } |
| 2311 | |
| 2312 | if (dev->scrub_device) { |
| 2313 | mutex_unlock(&fs_info->scrub_lock); |
| 2314 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 2315 | scrub_workers_put(root); |
| 2316 | return -EINPROGRESS; |
| 2317 | } |
| 2318 | sdev = scrub_setup_dev(dev); |
| 2319 | if (IS_ERR(sdev)) { |
| 2320 | mutex_unlock(&fs_info->scrub_lock); |
| 2321 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 2322 | scrub_workers_put(root); |
| 2323 | return PTR_ERR(sdev); |
| 2324 | } |
Arne Jansen | 8628764 | 2011-03-23 16:34:19 +0100 | [diff] [blame] | 2325 | sdev->readonly = readonly; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2326 | dev->scrub_device = sdev; |
| 2327 | |
| 2328 | atomic_inc(&fs_info->scrubs_running); |
| 2329 | mutex_unlock(&fs_info->scrub_lock); |
| 2330 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 2331 | |
| 2332 | down_read(&fs_info->scrub_super_lock); |
| 2333 | ret = scrub_supers(sdev); |
| 2334 | up_read(&fs_info->scrub_super_lock); |
| 2335 | |
| 2336 | if (!ret) |
| 2337 | ret = scrub_enumerate_chunks(sdev, start, end); |
| 2338 | |
| 2339 | wait_event(sdev->list_wait, atomic_read(&sdev->in_flight) == 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2340 | atomic_dec(&fs_info->scrubs_running); |
| 2341 | wake_up(&fs_info->scrub_pause_wait); |
| 2342 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 2343 | wait_event(sdev->list_wait, atomic_read(&sdev->fixup_cnt) == 0); |
| 2344 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2345 | if (progress) |
| 2346 | memcpy(progress, &sdev->stat, sizeof(*progress)); |
| 2347 | |
| 2348 | mutex_lock(&fs_info->scrub_lock); |
| 2349 | dev->scrub_device = NULL; |
| 2350 | mutex_unlock(&fs_info->scrub_lock); |
| 2351 | |
| 2352 | scrub_free_dev(sdev); |
| 2353 | scrub_workers_put(root); |
| 2354 | |
| 2355 | return ret; |
| 2356 | } |
| 2357 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 2358 | void btrfs_scrub_pause(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2359 | { |
| 2360 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2361 | |
| 2362 | mutex_lock(&fs_info->scrub_lock); |
| 2363 | atomic_inc(&fs_info->scrub_pause_req); |
| 2364 | while (atomic_read(&fs_info->scrubs_paused) != |
| 2365 | atomic_read(&fs_info->scrubs_running)) { |
| 2366 | mutex_unlock(&fs_info->scrub_lock); |
| 2367 | wait_event(fs_info->scrub_pause_wait, |
| 2368 | atomic_read(&fs_info->scrubs_paused) == |
| 2369 | atomic_read(&fs_info->scrubs_running)); |
| 2370 | mutex_lock(&fs_info->scrub_lock); |
| 2371 | } |
| 2372 | mutex_unlock(&fs_info->scrub_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2373 | } |
| 2374 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 2375 | void btrfs_scrub_continue(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2376 | { |
| 2377 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2378 | |
| 2379 | atomic_dec(&fs_info->scrub_pause_req); |
| 2380 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2381 | } |
| 2382 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 2383 | void btrfs_scrub_pause_super(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2384 | { |
| 2385 | down_write(&root->fs_info->scrub_super_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2386 | } |
| 2387 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 2388 | void btrfs_scrub_continue_super(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2389 | { |
| 2390 | up_write(&root->fs_info->scrub_super_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2391 | } |
| 2392 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2393 | int __btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2394 | { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2395 | |
| 2396 | mutex_lock(&fs_info->scrub_lock); |
| 2397 | if (!atomic_read(&fs_info->scrubs_running)) { |
| 2398 | mutex_unlock(&fs_info->scrub_lock); |
| 2399 | return -ENOTCONN; |
| 2400 | } |
| 2401 | |
| 2402 | atomic_inc(&fs_info->scrub_cancel_req); |
| 2403 | while (atomic_read(&fs_info->scrubs_running)) { |
| 2404 | mutex_unlock(&fs_info->scrub_lock); |
| 2405 | wait_event(fs_info->scrub_pause_wait, |
| 2406 | atomic_read(&fs_info->scrubs_running) == 0); |
| 2407 | mutex_lock(&fs_info->scrub_lock); |
| 2408 | } |
| 2409 | atomic_dec(&fs_info->scrub_cancel_req); |
| 2410 | mutex_unlock(&fs_info->scrub_lock); |
| 2411 | |
| 2412 | return 0; |
| 2413 | } |
| 2414 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2415 | int btrfs_scrub_cancel(struct btrfs_root *root) |
| 2416 | { |
| 2417 | return __btrfs_scrub_cancel(root->fs_info); |
| 2418 | } |
| 2419 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2420 | int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev) |
| 2421 | { |
| 2422 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2423 | struct scrub_dev *sdev; |
| 2424 | |
| 2425 | mutex_lock(&fs_info->scrub_lock); |
| 2426 | sdev = dev->scrub_device; |
| 2427 | if (!sdev) { |
| 2428 | mutex_unlock(&fs_info->scrub_lock); |
| 2429 | return -ENOTCONN; |
| 2430 | } |
| 2431 | atomic_inc(&sdev->cancel_req); |
| 2432 | while (dev->scrub_device) { |
| 2433 | mutex_unlock(&fs_info->scrub_lock); |
| 2434 | wait_event(fs_info->scrub_pause_wait, |
| 2435 | dev->scrub_device == NULL); |
| 2436 | mutex_lock(&fs_info->scrub_lock); |
| 2437 | } |
| 2438 | mutex_unlock(&fs_info->scrub_lock); |
| 2439 | |
| 2440 | return 0; |
| 2441 | } |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 2442 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2443 | int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid) |
| 2444 | { |
| 2445 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2446 | struct btrfs_device *dev; |
| 2447 | int ret; |
| 2448 | |
| 2449 | /* |
| 2450 | * we have to hold the device_list_mutex here so the device |
| 2451 | * does not go away in cancel_dev. FIXME: find a better solution |
| 2452 | */ |
| 2453 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
| 2454 | dev = btrfs_find_device(root, devid, NULL, NULL); |
| 2455 | if (!dev) { |
| 2456 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 2457 | return -ENODEV; |
| 2458 | } |
| 2459 | ret = btrfs_scrub_cancel_dev(root, dev); |
| 2460 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 2461 | |
| 2462 | return ret; |
| 2463 | } |
| 2464 | |
| 2465 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
| 2466 | struct btrfs_scrub_progress *progress) |
| 2467 | { |
| 2468 | struct btrfs_device *dev; |
| 2469 | struct scrub_dev *sdev = NULL; |
| 2470 | |
| 2471 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
| 2472 | dev = btrfs_find_device(root, devid, NULL, NULL); |
| 2473 | if (dev) |
| 2474 | sdev = dev->scrub_device; |
| 2475 | if (sdev) |
| 2476 | memcpy(progress, &sdev->stat, sizeof(*progress)); |
| 2477 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 2478 | |
| 2479 | return dev ? (sdev ? 0 : -ENOTCONN) : -ENODEV; |
| 2480 | } |