Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1 | /* |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 2 | * Copyright (C) 2011, 2012 STRATO. All rights reserved. |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 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 | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 28 | #include "dev-replace.h" |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 29 | #include "check-integrity.h" |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 30 | #include "rcu-string.h" |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 31 | #include "raid56.h" |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 32 | |
| 33 | /* |
| 34 | * This is only the first step towards a full-features scrub. It reads all |
| 35 | * extent and super block and verifies the checksums. In case a bad checksum |
| 36 | * is found or the extent cannot be read, good data will be written back if |
| 37 | * any can be found. |
| 38 | * |
| 39 | * Future enhancements: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 40 | * - In case an unrepairable extent is encountered, track which files are |
| 41 | * affected and report them |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 42 | * - track and record media errors, throw out bad devices |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 43 | * - add a mode to also read unallocated space |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 44 | */ |
| 45 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 46 | struct scrub_block; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 47 | struct scrub_ctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 48 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 49 | /* |
| 50 | * the following three values only influence the performance. |
| 51 | * The last one configures the number of parallel and outstanding I/O |
| 52 | * operations. The first two values configure an upper limit for the number |
| 53 | * of (dynamically allocated) pages that are added to a bio. |
| 54 | */ |
| 55 | #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */ |
| 56 | #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */ |
| 57 | #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */ |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 58 | |
| 59 | /* |
| 60 | * the following value times PAGE_SIZE needs to be large enough to match the |
| 61 | * largest node/leaf/sector size that shall be supported. |
| 62 | * Values larger than BTRFS_STRIPE_LEN are not supported. |
| 63 | */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 64 | #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */ |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 65 | |
| 66 | struct scrub_page { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 67 | struct scrub_block *sblock; |
| 68 | struct page *page; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 69 | struct btrfs_device *dev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 70 | u64 flags; /* extent flags */ |
| 71 | u64 generation; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 72 | u64 logical; |
| 73 | u64 physical; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 74 | u64 physical_for_dev_replace; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 75 | atomic_t ref_count; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 76 | struct { |
| 77 | unsigned int mirror_num:8; |
| 78 | unsigned int have_csum:1; |
| 79 | unsigned int io_error:1; |
| 80 | }; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 81 | u8 csum[BTRFS_CSUM_SIZE]; |
| 82 | }; |
| 83 | |
| 84 | struct scrub_bio { |
| 85 | int index; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 86 | struct scrub_ctx *sctx; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 87 | struct btrfs_device *dev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 88 | struct bio *bio; |
| 89 | int err; |
| 90 | u64 logical; |
| 91 | u64 physical; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 92 | #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO |
| 93 | struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; |
| 94 | #else |
| 95 | struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; |
| 96 | #endif |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 97 | int page_count; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 98 | int next_free; |
| 99 | struct btrfs_work work; |
| 100 | }; |
| 101 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 102 | struct scrub_block { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 103 | struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 104 | int page_count; |
| 105 | atomic_t outstanding_pages; |
| 106 | atomic_t ref_count; /* free mem on transition to zero */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 107 | struct scrub_ctx *sctx; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 108 | struct { |
| 109 | unsigned int header_error:1; |
| 110 | unsigned int checksum_error:1; |
| 111 | unsigned int no_io_error_seen:1; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 112 | unsigned int generation_error:1; /* also sets header_error */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 113 | }; |
| 114 | }; |
| 115 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 116 | struct scrub_wr_ctx { |
| 117 | struct scrub_bio *wr_curr_bio; |
| 118 | struct btrfs_device *tgtdev; |
| 119 | int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */ |
| 120 | atomic_t flush_all_writes; |
| 121 | struct mutex wr_lock; |
| 122 | }; |
| 123 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 124 | struct scrub_ctx { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 125 | struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX]; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 126 | struct btrfs_root *dev_root; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 127 | int first_free; |
| 128 | int curr; |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 129 | atomic_t bios_in_flight; |
| 130 | atomic_t workers_pending; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 131 | spinlock_t list_lock; |
| 132 | wait_queue_head_t list_wait; |
| 133 | u16 csum_size; |
| 134 | struct list_head csum_list; |
| 135 | atomic_t cancel_req; |
Arne Jansen | 8628764 | 2011-03-23 16:34:19 +0100 | [diff] [blame] | 136 | int readonly; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 137 | int pages_per_rd_bio; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 138 | u32 sectorsize; |
| 139 | u32 nodesize; |
| 140 | u32 leafsize; |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 141 | |
| 142 | int is_dev_replace; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 143 | struct scrub_wr_ctx wr_ctx; |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 144 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 145 | /* |
| 146 | * statistics |
| 147 | */ |
| 148 | struct btrfs_scrub_progress stat; |
| 149 | spinlock_t stat_lock; |
| 150 | }; |
| 151 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 152 | struct scrub_fixup_nodatasum { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 153 | struct scrub_ctx *sctx; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 154 | struct btrfs_device *dev; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 155 | u64 logical; |
| 156 | struct btrfs_root *root; |
| 157 | struct btrfs_work work; |
| 158 | int mirror_num; |
| 159 | }; |
| 160 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 161 | struct scrub_copy_nocow_ctx { |
| 162 | struct scrub_ctx *sctx; |
| 163 | u64 logical; |
| 164 | u64 len; |
| 165 | int mirror_num; |
| 166 | u64 physical_for_dev_replace; |
| 167 | struct btrfs_work work; |
| 168 | }; |
| 169 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 170 | struct scrub_warning { |
| 171 | struct btrfs_path *path; |
| 172 | u64 extent_item_size; |
| 173 | char *scratch_buf; |
| 174 | char *msg_buf; |
| 175 | const char *errstr; |
| 176 | sector_t sector; |
| 177 | u64 logical; |
| 178 | struct btrfs_device *dev; |
| 179 | int msg_bufsize; |
| 180 | int scratch_bufsize; |
| 181 | }; |
| 182 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 183 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 184 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx); |
| 185 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx); |
| 186 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx); |
| 187 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 188 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 189 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
Stefan Behrens | 3ec706c | 2012-11-05 15:46:42 +0100 | [diff] [blame] | 190 | struct btrfs_fs_info *fs_info, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 191 | struct scrub_block *original_sblock, |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 192 | u64 length, u64 logical, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 193 | struct scrub_block *sblocks_for_recheck); |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 194 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
| 195 | struct scrub_block *sblock, int is_metadata, |
| 196 | int have_csum, u8 *csum, u64 generation, |
| 197 | u16 csum_size); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 198 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
| 199 | struct scrub_block *sblock, |
| 200 | int is_metadata, int have_csum, |
| 201 | const u8 *csum, u64 generation, |
| 202 | u16 csum_size); |
| 203 | static void scrub_complete_bio_end_io(struct bio *bio, int err); |
| 204 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
| 205 | struct scrub_block *sblock_good, |
| 206 | int force_write); |
| 207 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
| 208 | struct scrub_block *sblock_good, |
| 209 | int page_num, int force_write); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 210 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); |
| 211 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, |
| 212 | int page_num); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 213 | static int scrub_checksum_data(struct scrub_block *sblock); |
| 214 | static int scrub_checksum_tree_block(struct scrub_block *sblock); |
| 215 | static int scrub_checksum_super(struct scrub_block *sblock); |
| 216 | static void scrub_block_get(struct scrub_block *sblock); |
| 217 | static void scrub_block_put(struct scrub_block *sblock); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 218 | static void scrub_page_get(struct scrub_page *spage); |
| 219 | static void scrub_page_put(struct scrub_page *spage); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 220 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
| 221 | struct scrub_page *spage); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 222 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 223 | u64 physical, struct btrfs_device *dev, u64 flags, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 224 | u64 gen, int mirror_num, u8 *csum, int force, |
| 225 | u64 physical_for_dev_replace); |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 226 | static void scrub_bio_end_io(struct bio *bio, int err); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 227 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
| 228 | static void scrub_block_complete(struct scrub_block *sblock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 229 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
| 230 | u64 extent_logical, u64 extent_len, |
| 231 | u64 *extent_physical, |
| 232 | struct btrfs_device **extent_dev, |
| 233 | int *extent_mirror_num); |
| 234 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, |
| 235 | struct scrub_wr_ctx *wr_ctx, |
| 236 | struct btrfs_fs_info *fs_info, |
| 237 | struct btrfs_device *dev, |
| 238 | int is_dev_replace); |
| 239 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx); |
| 240 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, |
| 241 | struct scrub_page *spage); |
| 242 | static void scrub_wr_submit(struct scrub_ctx *sctx); |
| 243 | static void scrub_wr_bio_end_io(struct bio *bio, int err); |
| 244 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); |
| 245 | static int write_page_nocow(struct scrub_ctx *sctx, |
| 246 | u64 physical_for_dev_replace, struct page *page); |
| 247 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, |
| 248 | void *ctx); |
| 249 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
| 250 | int mirror_num, u64 physical_for_dev_replace); |
| 251 | static void copy_nocow_pages_worker(struct btrfs_work *work); |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 252 | |
| 253 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 254 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
| 255 | { |
| 256 | atomic_inc(&sctx->bios_in_flight); |
| 257 | } |
| 258 | |
| 259 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) |
| 260 | { |
| 261 | atomic_dec(&sctx->bios_in_flight); |
| 262 | wake_up(&sctx->list_wait); |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * used for workers that require transaction commits (i.e., for the |
| 267 | * NOCOW case) |
| 268 | */ |
| 269 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx) |
| 270 | { |
| 271 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
| 272 | |
| 273 | /* |
| 274 | * increment scrubs_running to prevent cancel requests from |
| 275 | * completing as long as a worker is running. we must also |
| 276 | * increment scrubs_paused to prevent deadlocking on pause |
| 277 | * requests used for transactions commits (as the worker uses a |
| 278 | * transaction context). it is safe to regard the worker |
| 279 | * as paused for all matters practical. effectively, we only |
| 280 | * avoid cancellation requests from completing. |
| 281 | */ |
| 282 | mutex_lock(&fs_info->scrub_lock); |
| 283 | atomic_inc(&fs_info->scrubs_running); |
| 284 | atomic_inc(&fs_info->scrubs_paused); |
| 285 | mutex_unlock(&fs_info->scrub_lock); |
| 286 | atomic_inc(&sctx->workers_pending); |
| 287 | } |
| 288 | |
| 289 | /* used for workers that require transaction commits */ |
| 290 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx) |
| 291 | { |
| 292 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
| 293 | |
| 294 | /* |
| 295 | * see scrub_pending_trans_workers_inc() why we're pretending |
| 296 | * to be paused in the scrub counters |
| 297 | */ |
| 298 | mutex_lock(&fs_info->scrub_lock); |
| 299 | atomic_dec(&fs_info->scrubs_running); |
| 300 | atomic_dec(&fs_info->scrubs_paused); |
| 301 | mutex_unlock(&fs_info->scrub_lock); |
| 302 | atomic_dec(&sctx->workers_pending); |
| 303 | wake_up(&fs_info->scrub_pause_wait); |
| 304 | wake_up(&sctx->list_wait); |
| 305 | } |
| 306 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 307 | static void scrub_free_csums(struct scrub_ctx *sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 308 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 309 | while (!list_empty(&sctx->csum_list)) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 310 | struct btrfs_ordered_sum *sum; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 311 | sum = list_first_entry(&sctx->csum_list, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 312 | struct btrfs_ordered_sum, list); |
| 313 | list_del(&sum->list); |
| 314 | kfree(sum); |
| 315 | } |
| 316 | } |
| 317 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 318 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 319 | { |
| 320 | int i; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 321 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 322 | if (!sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 323 | return; |
| 324 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 325 | scrub_free_wr_ctx(&sctx->wr_ctx); |
| 326 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 327 | /* this can happen when scrub is cancelled */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 328 | if (sctx->curr != -1) { |
| 329 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 330 | |
| 331 | for (i = 0; i < sbio->page_count; i++) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 332 | WARN_ON(!sbio->pagev[i]->page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 333 | scrub_block_put(sbio->pagev[i]->sblock); |
| 334 | } |
| 335 | bio_put(sbio->bio); |
| 336 | } |
| 337 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 338 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 339 | struct scrub_bio *sbio = sctx->bios[i]; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 340 | |
| 341 | if (!sbio) |
| 342 | break; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 343 | kfree(sbio); |
| 344 | } |
| 345 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 346 | scrub_free_csums(sctx); |
| 347 | kfree(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | static noinline_for_stack |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 351 | struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 352 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 353 | struct scrub_ctx *sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 354 | int i; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 355 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 356 | int pages_per_rd_bio; |
| 357 | int ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 358 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 359 | /* |
| 360 | * the setting of pages_per_rd_bio is correct for scrub but might |
| 361 | * be wrong for the dev_replace code where we might read from |
| 362 | * different devices in the initial huge bios. However, that |
| 363 | * code is able to correctly handle the case when adding a page |
| 364 | * to a bio fails. |
| 365 | */ |
| 366 | if (dev->bdev) |
| 367 | pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO, |
| 368 | bio_get_nr_vecs(dev->bdev)); |
| 369 | else |
| 370 | pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 371 | sctx = kzalloc(sizeof(*sctx), GFP_NOFS); |
| 372 | if (!sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 373 | goto nomem; |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 374 | sctx->is_dev_replace = is_dev_replace; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 375 | sctx->pages_per_rd_bio = pages_per_rd_bio; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 376 | sctx->curr = -1; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 377 | sctx->dev_root = dev->dev_root; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 378 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 379 | struct scrub_bio *sbio; |
| 380 | |
| 381 | sbio = kzalloc(sizeof(*sbio), GFP_NOFS); |
| 382 | if (!sbio) |
| 383 | goto nomem; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 384 | sctx->bios[i] = sbio; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 385 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 386 | sbio->index = i; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 387 | sbio->sctx = sctx; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 388 | sbio->page_count = 0; |
| 389 | sbio->work.func = scrub_bio_end_io_worker; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 390 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 391 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 392 | sctx->bios[i]->next_free = i + 1; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 393 | else |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 394 | sctx->bios[i]->next_free = -1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 395 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 396 | sctx->first_free = 0; |
| 397 | sctx->nodesize = dev->dev_root->nodesize; |
| 398 | sctx->leafsize = dev->dev_root->leafsize; |
| 399 | sctx->sectorsize = dev->dev_root->sectorsize; |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 400 | atomic_set(&sctx->bios_in_flight, 0); |
| 401 | atomic_set(&sctx->workers_pending, 0); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 402 | atomic_set(&sctx->cancel_req, 0); |
| 403 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); |
| 404 | INIT_LIST_HEAD(&sctx->csum_list); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 405 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 406 | spin_lock_init(&sctx->list_lock); |
| 407 | spin_lock_init(&sctx->stat_lock); |
| 408 | init_waitqueue_head(&sctx->list_wait); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 409 | |
| 410 | ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info, |
| 411 | fs_info->dev_replace.tgtdev, is_dev_replace); |
| 412 | if (ret) { |
| 413 | scrub_free_ctx(sctx); |
| 414 | return ERR_PTR(ret); |
| 415 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 416 | return sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 417 | |
| 418 | nomem: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 419 | scrub_free_ctx(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 420 | return ERR_PTR(-ENOMEM); |
| 421 | } |
| 422 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 423 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
| 424 | void *warn_ctx) |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 425 | { |
| 426 | u64 isize; |
| 427 | u32 nlink; |
| 428 | int ret; |
| 429 | int i; |
| 430 | struct extent_buffer *eb; |
| 431 | struct btrfs_inode_item *inode_item; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 432 | struct scrub_warning *swarn = warn_ctx; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 433 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
| 434 | struct inode_fs_paths *ipath = NULL; |
| 435 | struct btrfs_root *local_root; |
| 436 | struct btrfs_key root_key; |
| 437 | |
| 438 | root_key.objectid = root; |
| 439 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 440 | root_key.offset = (u64)-1; |
| 441 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); |
| 442 | if (IS_ERR(local_root)) { |
| 443 | ret = PTR_ERR(local_root); |
| 444 | goto err; |
| 445 | } |
| 446 | |
| 447 | ret = inode_item_info(inum, 0, local_root, swarn->path); |
| 448 | if (ret) { |
| 449 | btrfs_release_path(swarn->path); |
| 450 | goto err; |
| 451 | } |
| 452 | |
| 453 | eb = swarn->path->nodes[0]; |
| 454 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], |
| 455 | struct btrfs_inode_item); |
| 456 | isize = btrfs_inode_size(eb, inode_item); |
| 457 | nlink = btrfs_inode_nlink(eb, inode_item); |
| 458 | btrfs_release_path(swarn->path); |
| 459 | |
| 460 | ipath = init_ipath(4096, local_root, swarn->path); |
Dan Carpenter | 26bdef5 | 2011-11-16 11:28:01 +0300 | [diff] [blame] | 461 | if (IS_ERR(ipath)) { |
| 462 | ret = PTR_ERR(ipath); |
| 463 | ipath = NULL; |
| 464 | goto err; |
| 465 | } |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 466 | ret = paths_from_inode(inum, ipath); |
| 467 | |
| 468 | if (ret < 0) |
| 469 | goto err; |
| 470 | |
| 471 | /* |
| 472 | * we deliberately ignore the bit ipath might have been too small to |
| 473 | * hold all of the paths here |
| 474 | */ |
| 475 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 476 | printk_in_rcu(KERN_WARNING "btrfs: %s at logical %llu on dev " |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 477 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
| 478 | "length %llu, links %u (path: %s)\n", swarn->errstr, |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 479 | swarn->logical, rcu_str_deref(swarn->dev->name), |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 480 | (unsigned long long)swarn->sector, root, inum, offset, |
| 481 | min(isize - offset, (u64)PAGE_SIZE), nlink, |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 482 | (char *)(unsigned long)ipath->fspath->val[i]); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 483 | |
| 484 | free_ipath(ipath); |
| 485 | return 0; |
| 486 | |
| 487 | err: |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 488 | printk_in_rcu(KERN_WARNING "btrfs: %s at logical %llu on dev " |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 489 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
| 490 | "resolving failed with ret=%d\n", swarn->errstr, |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 491 | swarn->logical, rcu_str_deref(swarn->dev->name), |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 492 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
| 493 | |
| 494 | free_ipath(ipath); |
| 495 | return 0; |
| 496 | } |
| 497 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 498 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 499 | { |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 500 | struct btrfs_device *dev; |
| 501 | struct btrfs_fs_info *fs_info; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 502 | struct btrfs_path *path; |
| 503 | struct btrfs_key found_key; |
| 504 | struct extent_buffer *eb; |
| 505 | struct btrfs_extent_item *ei; |
| 506 | struct scrub_warning swarn; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 507 | unsigned long ptr = 0; |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 508 | u64 extent_item_pos; |
Liu Bo | 69917e4 | 2012-09-07 20:01:28 -0600 | [diff] [blame] | 509 | u64 flags = 0; |
| 510 | u64 ref_root; |
| 511 | u32 item_size; |
| 512 | u8 ref_level; |
| 513 | const int bufsize = 4096; |
| 514 | int ret; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 515 | |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 516 | WARN_ON(sblock->page_count < 1); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 517 | dev = sblock->pagev[0]->dev; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 518 | fs_info = sblock->sctx->dev_root->fs_info; |
| 519 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 520 | path = btrfs_alloc_path(); |
| 521 | |
| 522 | swarn.scratch_buf = kmalloc(bufsize, GFP_NOFS); |
| 523 | swarn.msg_buf = kmalloc(bufsize, GFP_NOFS); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 524 | swarn.sector = (sblock->pagev[0]->physical) >> 9; |
| 525 | swarn.logical = sblock->pagev[0]->logical; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 526 | swarn.errstr = errstr; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 527 | swarn.dev = NULL; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 528 | swarn.msg_bufsize = bufsize; |
| 529 | swarn.scratch_bufsize = bufsize; |
| 530 | |
| 531 | if (!path || !swarn.scratch_buf || !swarn.msg_buf) |
| 532 | goto out; |
| 533 | |
Liu Bo | 69917e4 | 2012-09-07 20:01:28 -0600 | [diff] [blame] | 534 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
| 535 | &flags); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 536 | if (ret < 0) |
| 537 | goto out; |
| 538 | |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 539 | extent_item_pos = swarn.logical - found_key.objectid; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 540 | swarn.extent_item_size = found_key.offset; |
| 541 | |
| 542 | eb = path->nodes[0]; |
| 543 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); |
| 544 | item_size = btrfs_item_size_nr(eb, path->slots[0]); |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 545 | btrfs_release_path(path); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 546 | |
Liu Bo | 69917e4 | 2012-09-07 20:01:28 -0600 | [diff] [blame] | 547 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 548 | do { |
| 549 | ret = tree_backref_for_extent(&ptr, eb, ei, item_size, |
| 550 | &ref_root, &ref_level); |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 551 | printk_in_rcu(KERN_WARNING |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 552 | "btrfs: %s at logical %llu on dev %s, " |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 553 | "sector %llu: metadata %s (level %d) in tree " |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 554 | "%llu\n", errstr, swarn.logical, |
| 555 | rcu_str_deref(dev->name), |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 556 | (unsigned long long)swarn.sector, |
| 557 | ref_level ? "node" : "leaf", |
| 558 | ret < 0 ? -1 : ref_level, |
| 559 | ret < 0 ? -1 : ref_root); |
| 560 | } while (ret != 1); |
| 561 | } else { |
| 562 | swarn.path = path; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 563 | swarn.dev = dev; |
Jan Schmidt | 7a3ae2f | 2012-03-23 17:32:28 +0100 | [diff] [blame] | 564 | iterate_extent_inodes(fs_info, found_key.objectid, |
| 565 | extent_item_pos, 1, |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 566 | scrub_print_warning_inode, &swarn); |
| 567 | } |
| 568 | |
| 569 | out: |
| 570 | btrfs_free_path(path); |
| 571 | kfree(swarn.scratch_buf); |
| 572 | kfree(swarn.msg_buf); |
| 573 | } |
| 574 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 575 | static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx) |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 576 | { |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 577 | struct page *page = NULL; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 578 | unsigned long index; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 579 | struct scrub_fixup_nodatasum *fixup = fixup_ctx; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 580 | int ret; |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 581 | int corrected = 0; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 582 | struct btrfs_key key; |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 583 | struct inode *inode = NULL; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 584 | struct btrfs_fs_info *fs_info; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 585 | u64 end = offset + PAGE_SIZE - 1; |
| 586 | struct btrfs_root *local_root; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 587 | int srcu_index; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 588 | |
| 589 | key.objectid = root; |
| 590 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 591 | key.offset = (u64)-1; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 592 | |
| 593 | fs_info = fixup->root->fs_info; |
| 594 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); |
| 595 | |
| 596 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
| 597 | if (IS_ERR(local_root)) { |
| 598 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 599 | return PTR_ERR(local_root); |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 600 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 601 | |
| 602 | key.type = BTRFS_INODE_ITEM_KEY; |
| 603 | key.objectid = inum; |
| 604 | key.offset = 0; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 605 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
| 606 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 607 | if (IS_ERR(inode)) |
| 608 | return PTR_ERR(inode); |
| 609 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 610 | index = offset >> PAGE_CACHE_SHIFT; |
| 611 | |
| 612 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 613 | if (!page) { |
| 614 | ret = -ENOMEM; |
| 615 | goto out; |
| 616 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 617 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 618 | if (PageUptodate(page)) { |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 619 | if (PageDirty(page)) { |
| 620 | /* |
| 621 | * we need to write the data to the defect sector. the |
| 622 | * data that was in that sector is not in memory, |
| 623 | * because the page was modified. we must not write the |
| 624 | * modified page to that sector. |
| 625 | * |
| 626 | * TODO: what could be done here: wait for the delalloc |
| 627 | * runner to write out that page (might involve |
| 628 | * COW) and see whether the sector is still |
| 629 | * referenced afterwards. |
| 630 | * |
| 631 | * For the meantime, we'll treat this error |
| 632 | * incorrectable, although there is a chance that a |
| 633 | * later scrub will find the bad sector again and that |
| 634 | * there's no dirty page in memory, then. |
| 635 | */ |
| 636 | ret = -EIO; |
| 637 | goto out; |
| 638 | } |
Stefan Behrens | 3ec706c | 2012-11-05 15:46:42 +0100 | [diff] [blame] | 639 | fs_info = BTRFS_I(inode)->root->fs_info; |
| 640 | ret = repair_io_failure(fs_info, offset, PAGE_SIZE, |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 641 | fixup->logical, page, |
| 642 | fixup->mirror_num); |
| 643 | unlock_page(page); |
| 644 | corrected = !ret; |
| 645 | } else { |
| 646 | /* |
| 647 | * we need to get good data first. the general readpage path |
| 648 | * will call repair_io_failure for us, we just have to make |
| 649 | * sure we read the bad mirror. |
| 650 | */ |
| 651 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, |
| 652 | EXTENT_DAMAGED, GFP_NOFS); |
| 653 | if (ret) { |
| 654 | /* set_extent_bits should give proper error */ |
| 655 | WARN_ON(ret > 0); |
| 656 | if (ret > 0) |
| 657 | ret = -EFAULT; |
| 658 | goto out; |
| 659 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 660 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 661 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, |
| 662 | btrfs_get_extent, |
| 663 | fixup->mirror_num); |
| 664 | wait_on_page_locked(page); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 665 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 666 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, |
| 667 | end, EXTENT_DAMAGED, 0, NULL); |
| 668 | if (!corrected) |
| 669 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, |
| 670 | EXTENT_DAMAGED, GFP_NOFS); |
| 671 | } |
| 672 | |
| 673 | out: |
| 674 | if (page) |
| 675 | put_page(page); |
| 676 | if (inode) |
| 677 | iput(inode); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 678 | |
| 679 | if (ret < 0) |
| 680 | return ret; |
| 681 | |
| 682 | if (ret == 0 && corrected) { |
| 683 | /* |
| 684 | * we only need to call readpage for one of the inodes belonging |
| 685 | * to this extent. so make iterate_extent_inodes stop |
| 686 | */ |
| 687 | return 1; |
| 688 | } |
| 689 | |
| 690 | return -EIO; |
| 691 | } |
| 692 | |
| 693 | static void scrub_fixup_nodatasum(struct btrfs_work *work) |
| 694 | { |
| 695 | int ret; |
| 696 | struct scrub_fixup_nodatasum *fixup; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 697 | struct scrub_ctx *sctx; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 698 | struct btrfs_trans_handle *trans = NULL; |
| 699 | struct btrfs_fs_info *fs_info; |
| 700 | struct btrfs_path *path; |
| 701 | int uncorrectable = 0; |
| 702 | |
| 703 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 704 | sctx = fixup->sctx; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 705 | fs_info = fixup->root->fs_info; |
| 706 | |
| 707 | path = btrfs_alloc_path(); |
| 708 | if (!path) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 709 | spin_lock(&sctx->stat_lock); |
| 710 | ++sctx->stat.malloc_errors; |
| 711 | spin_unlock(&sctx->stat_lock); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 712 | uncorrectable = 1; |
| 713 | goto out; |
| 714 | } |
| 715 | |
| 716 | trans = btrfs_join_transaction(fixup->root); |
| 717 | if (IS_ERR(trans)) { |
| 718 | uncorrectable = 1; |
| 719 | goto out; |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * the idea is to trigger a regular read through the standard path. we |
| 724 | * read a page from the (failed) logical address by specifying the |
| 725 | * corresponding copynum of the failed sector. thus, that readpage is |
| 726 | * expected to fail. |
| 727 | * that is the point where on-the-fly error correction will kick in |
| 728 | * (once it's finished) and rewrite the failed sector if a good copy |
| 729 | * can be found. |
| 730 | */ |
| 731 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, |
| 732 | path, scrub_fixup_readpage, |
| 733 | fixup); |
| 734 | if (ret < 0) { |
| 735 | uncorrectable = 1; |
| 736 | goto out; |
| 737 | } |
| 738 | WARN_ON(ret != 1); |
| 739 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 740 | spin_lock(&sctx->stat_lock); |
| 741 | ++sctx->stat.corrected_errors; |
| 742 | spin_unlock(&sctx->stat_lock); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 743 | |
| 744 | out: |
| 745 | if (trans && !IS_ERR(trans)) |
| 746 | btrfs_end_transaction(trans, fixup->root); |
| 747 | if (uncorrectable) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 748 | spin_lock(&sctx->stat_lock); |
| 749 | ++sctx->stat.uncorrectable_errors; |
| 750 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 751 | btrfs_dev_replace_stats_inc( |
| 752 | &sctx->dev_root->fs_info->dev_replace. |
| 753 | num_uncorrectable_read_errors); |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 754 | printk_ratelimited_in_rcu(KERN_ERR |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 755 | "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] | 756 | (unsigned long long)fixup->logical, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 757 | rcu_str_deref(fixup->dev->name)); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 758 | } |
| 759 | |
| 760 | btrfs_free_path(path); |
| 761 | kfree(fixup); |
| 762 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 763 | scrub_pending_trans_workers_dec(sctx); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 764 | } |
| 765 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 766 | /* |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 767 | * scrub_handle_errored_block gets called when either verification of the |
| 768 | * pages failed or the bio failed to read, e.g. with EIO. In the latter |
| 769 | * case, this function handles all pages in the bio, even though only one |
| 770 | * may be bad. |
| 771 | * The goal of this function is to repair the errored block by using the |
| 772 | * contents of one of the mirrors. |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 773 | */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 774 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 775 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 776 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 777 | struct btrfs_device *dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 778 | struct btrfs_fs_info *fs_info; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 779 | u64 length; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 780 | u64 logical; |
| 781 | u64 generation; |
| 782 | unsigned int failed_mirror_index; |
| 783 | unsigned int is_metadata; |
| 784 | unsigned int have_csum; |
| 785 | u8 *csum; |
| 786 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ |
| 787 | struct scrub_block *sblock_bad; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 788 | int ret; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 789 | int mirror_index; |
| 790 | int page_num; |
| 791 | int success; |
| 792 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
| 793 | DEFAULT_RATELIMIT_BURST); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 794 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 795 | BUG_ON(sblock_to_check->page_count < 1); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 796 | fs_info = sctx->dev_root->fs_info; |
Stefan Behrens | 4ded4f6 | 2012-11-14 18:57:29 +0000 | [diff] [blame] | 797 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
| 798 | /* |
| 799 | * if we find an error in a super block, we just report it. |
| 800 | * They will get written with the next transaction commit |
| 801 | * anyway |
| 802 | */ |
| 803 | spin_lock(&sctx->stat_lock); |
| 804 | ++sctx->stat.super_errors; |
| 805 | spin_unlock(&sctx->stat_lock); |
| 806 | return 0; |
| 807 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 808 | length = sblock_to_check->page_count * PAGE_SIZE; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 809 | logical = sblock_to_check->pagev[0]->logical; |
| 810 | generation = sblock_to_check->pagev[0]->generation; |
| 811 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); |
| 812 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; |
| 813 | is_metadata = !(sblock_to_check->pagev[0]->flags & |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 814 | BTRFS_EXTENT_FLAG_DATA); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 815 | have_csum = sblock_to_check->pagev[0]->have_csum; |
| 816 | csum = sblock_to_check->pagev[0]->csum; |
| 817 | dev = sblock_to_check->pagev[0]->dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 818 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 819 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
| 820 | sblocks_for_recheck = NULL; |
| 821 | goto nodatasum_case; |
| 822 | } |
| 823 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 824 | /* |
| 825 | * read all mirrors one after the other. This includes to |
| 826 | * re-read the extent or metadata block that failed (that was |
| 827 | * the cause that this fixup code is called) another time, |
| 828 | * page by page this time in order to know which pages |
| 829 | * caused I/O errors and which ones are good (for all mirrors). |
| 830 | * It is the goal to handle the situation when more than one |
| 831 | * mirror contains I/O errors, but the errors do not |
| 832 | * overlap, i.e. the data can be repaired by selecting the |
| 833 | * pages from those mirrors without I/O error on the |
| 834 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) |
| 835 | * would be that mirror #1 has an I/O error on the first page, |
| 836 | * the second page is good, and mirror #2 has an I/O error on |
| 837 | * the second page, but the first page is good. |
| 838 | * Then the first page of the first mirror can be repaired by |
| 839 | * taking the first page of the second mirror, and the |
| 840 | * second page of the second mirror can be repaired by |
| 841 | * copying the contents of the 2nd page of the 1st mirror. |
| 842 | * One more note: if the pages of one mirror contain I/O |
| 843 | * errors, the checksum cannot be verified. In order to get |
| 844 | * the best data for repairing, the first attempt is to find |
| 845 | * a mirror without I/O errors and with a validated checksum. |
| 846 | * Only if this is not possible, the pages are picked from |
| 847 | * mirrors with I/O errors without considering the checksum. |
| 848 | * If the latter is the case, at the end, the checksum of the |
| 849 | * repaired area is verified in order to correctly maintain |
| 850 | * the statistics. |
| 851 | */ |
| 852 | |
| 853 | sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS * |
| 854 | sizeof(*sblocks_for_recheck), |
| 855 | GFP_NOFS); |
| 856 | if (!sblocks_for_recheck) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 857 | spin_lock(&sctx->stat_lock); |
| 858 | sctx->stat.malloc_errors++; |
| 859 | sctx->stat.read_errors++; |
| 860 | sctx->stat.uncorrectable_errors++; |
| 861 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 862 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 863 | goto out; |
| 864 | } |
| 865 | |
| 866 | /* setup the context, map the logical blocks and alloc the pages */ |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 867 | ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length, |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 868 | logical, sblocks_for_recheck); |
| 869 | if (ret) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 870 | spin_lock(&sctx->stat_lock); |
| 871 | sctx->stat.read_errors++; |
| 872 | sctx->stat.uncorrectable_errors++; |
| 873 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 874 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 875 | goto out; |
| 876 | } |
| 877 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); |
| 878 | sblock_bad = sblocks_for_recheck + failed_mirror_index; |
| 879 | |
| 880 | /* build and submit the bios for the failed mirror, check checksums */ |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 881 | scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum, |
| 882 | csum, generation, sctx->csum_size); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 883 | |
| 884 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
| 885 | sblock_bad->no_io_error_seen) { |
| 886 | /* |
| 887 | * the error disappeared after reading page by page, or |
| 888 | * the area was part of a huge bio and other parts of the |
| 889 | * bio caused I/O errors, or the block layer merged several |
| 890 | * read requests into one and the error is caused by a |
| 891 | * different bio (usually one of the two latter cases is |
| 892 | * the cause) |
| 893 | */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 894 | spin_lock(&sctx->stat_lock); |
| 895 | sctx->stat.unverified_errors++; |
| 896 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 897 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 898 | if (sctx->is_dev_replace) |
| 899 | scrub_write_block_to_dev_replace(sblock_bad); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 900 | goto out; |
| 901 | } |
| 902 | |
| 903 | if (!sblock_bad->no_io_error_seen) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 904 | spin_lock(&sctx->stat_lock); |
| 905 | sctx->stat.read_errors++; |
| 906 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 907 | if (__ratelimit(&_rs)) |
| 908 | scrub_print_warning("i/o error", sblock_to_check); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 909 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 910 | } else if (sblock_bad->checksum_error) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 911 | spin_lock(&sctx->stat_lock); |
| 912 | sctx->stat.csum_errors++; |
| 913 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 914 | if (__ratelimit(&_rs)) |
| 915 | scrub_print_warning("checksum error", sblock_to_check); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 916 | btrfs_dev_stat_inc_and_print(dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 917 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 918 | } else if (sblock_bad->header_error) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 919 | spin_lock(&sctx->stat_lock); |
| 920 | sctx->stat.verify_errors++; |
| 921 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 922 | if (__ratelimit(&_rs)) |
| 923 | scrub_print_warning("checksum/header error", |
| 924 | sblock_to_check); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 925 | if (sblock_bad->generation_error) |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 926 | btrfs_dev_stat_inc_and_print(dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 927 | BTRFS_DEV_STAT_GENERATION_ERRS); |
| 928 | else |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 929 | btrfs_dev_stat_inc_and_print(dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 930 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 931 | } |
| 932 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 933 | if (sctx->readonly && !sctx->is_dev_replace) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 934 | goto did_not_correct_error; |
| 935 | |
| 936 | if (!is_metadata && !have_csum) { |
| 937 | struct scrub_fixup_nodatasum *fixup_nodatasum; |
| 938 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 939 | nodatasum_case: |
| 940 | WARN_ON(sctx->is_dev_replace); |
| 941 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 942 | /* |
| 943 | * !is_metadata and !have_csum, this means that the data |
| 944 | * might not be COW'ed, that it might be modified |
| 945 | * concurrently. The general strategy to work on the |
| 946 | * commit root does not help in the case when COW is not |
| 947 | * used. |
| 948 | */ |
| 949 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); |
| 950 | if (!fixup_nodatasum) |
| 951 | goto did_not_correct_error; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 952 | fixup_nodatasum->sctx = sctx; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 953 | fixup_nodatasum->dev = dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 954 | fixup_nodatasum->logical = logical; |
| 955 | fixup_nodatasum->root = fs_info->extent_root; |
| 956 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 957 | scrub_pending_trans_workers_inc(sctx); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 958 | fixup_nodatasum->work.func = scrub_fixup_nodatasum; |
| 959 | btrfs_queue_worker(&fs_info->scrub_workers, |
| 960 | &fixup_nodatasum->work); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 961 | goto out; |
| 962 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 963 | |
| 964 | /* |
| 965 | * now build and submit the bios for the other mirrors, check |
Stefan Behrens | cb2ced7 | 2012-11-02 16:14:21 +0100 | [diff] [blame] | 966 | * checksums. |
| 967 | * First try to pick the mirror which is completely without I/O |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 968 | * errors and also does not have a checksum error. |
| 969 | * If one is found, and if a checksum is present, the full block |
| 970 | * that is known to contain an error is rewritten. Afterwards |
| 971 | * the block is known to be corrected. |
| 972 | * If a mirror is found which is completely correct, and no |
| 973 | * checksum is present, only those pages are rewritten that had |
| 974 | * an I/O error in the block to be repaired, since it cannot be |
| 975 | * determined, which copy of the other pages is better (and it |
| 976 | * could happen otherwise that a correct page would be |
| 977 | * overwritten by a bad one). |
| 978 | */ |
| 979 | for (mirror_index = 0; |
| 980 | mirror_index < BTRFS_MAX_MIRRORS && |
| 981 | sblocks_for_recheck[mirror_index].page_count > 0; |
| 982 | mirror_index++) { |
Stefan Behrens | cb2ced7 | 2012-11-02 16:14:21 +0100 | [diff] [blame] | 983 | struct scrub_block *sblock_other; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 984 | |
Stefan Behrens | cb2ced7 | 2012-11-02 16:14:21 +0100 | [diff] [blame] | 985 | if (mirror_index == failed_mirror_index) |
| 986 | continue; |
| 987 | sblock_other = sblocks_for_recheck + mirror_index; |
| 988 | |
| 989 | /* build and submit the bios, check checksums */ |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 990 | scrub_recheck_block(fs_info, sblock_other, is_metadata, |
| 991 | have_csum, csum, generation, |
| 992 | sctx->csum_size); |
| 993 | |
| 994 | if (!sblock_other->header_error && |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 995 | !sblock_other->checksum_error && |
| 996 | sblock_other->no_io_error_seen) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 997 | if (sctx->is_dev_replace) { |
| 998 | scrub_write_block_to_dev_replace(sblock_other); |
| 999 | } else { |
| 1000 | int force_write = is_metadata || have_csum; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1001 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1002 | ret = scrub_repair_block_from_good_copy( |
| 1003 | sblock_bad, sblock_other, |
| 1004 | force_write); |
| 1005 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1006 | if (0 == ret) |
| 1007 | goto corrected_error; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1008 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1009 | } |
| 1010 | |
| 1011 | /* |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1012 | * for dev_replace, pick good pages and write to the target device. |
| 1013 | */ |
| 1014 | if (sctx->is_dev_replace) { |
| 1015 | success = 1; |
| 1016 | for (page_num = 0; page_num < sblock_bad->page_count; |
| 1017 | page_num++) { |
| 1018 | int sub_success; |
| 1019 | |
| 1020 | sub_success = 0; |
| 1021 | for (mirror_index = 0; |
| 1022 | mirror_index < BTRFS_MAX_MIRRORS && |
| 1023 | sblocks_for_recheck[mirror_index].page_count > 0; |
| 1024 | mirror_index++) { |
| 1025 | struct scrub_block *sblock_other = |
| 1026 | sblocks_for_recheck + mirror_index; |
| 1027 | struct scrub_page *page_other = |
| 1028 | sblock_other->pagev[page_num]; |
| 1029 | |
| 1030 | if (!page_other->io_error) { |
| 1031 | ret = scrub_write_page_to_dev_replace( |
| 1032 | sblock_other, page_num); |
| 1033 | if (ret == 0) { |
| 1034 | /* succeeded for this page */ |
| 1035 | sub_success = 1; |
| 1036 | break; |
| 1037 | } else { |
| 1038 | btrfs_dev_replace_stats_inc( |
| 1039 | &sctx->dev_root-> |
| 1040 | fs_info->dev_replace. |
| 1041 | num_write_errors); |
| 1042 | } |
| 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | if (!sub_success) { |
| 1047 | /* |
| 1048 | * did not find a mirror to fetch the page |
| 1049 | * from. scrub_write_page_to_dev_replace() |
| 1050 | * handles this case (page->io_error), by |
| 1051 | * filling the block with zeros before |
| 1052 | * submitting the write request |
| 1053 | */ |
| 1054 | success = 0; |
| 1055 | ret = scrub_write_page_to_dev_replace( |
| 1056 | sblock_bad, page_num); |
| 1057 | if (ret) |
| 1058 | btrfs_dev_replace_stats_inc( |
| 1059 | &sctx->dev_root->fs_info-> |
| 1060 | dev_replace.num_write_errors); |
| 1061 | } |
| 1062 | } |
| 1063 | |
| 1064 | goto out; |
| 1065 | } |
| 1066 | |
| 1067 | /* |
| 1068 | * for regular scrub, repair those pages that are errored. |
| 1069 | * In case of I/O errors in the area that is supposed to be |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1070 | * repaired, continue by picking good copies of those pages. |
| 1071 | * Select the good pages from mirrors to rewrite bad pages from |
| 1072 | * the area to fix. Afterwards verify the checksum of the block |
| 1073 | * that is supposed to be repaired. This verification step is |
| 1074 | * only done for the purpose of statistic counting and for the |
| 1075 | * final scrub report, whether errors remain. |
| 1076 | * A perfect algorithm could make use of the checksum and try |
| 1077 | * all possible combinations of pages from the different mirrors |
| 1078 | * until the checksum verification succeeds. For example, when |
| 1079 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page |
| 1080 | * of mirror #2 is readable but the final checksum test fails, |
| 1081 | * then the 2nd page of mirror #3 could be tried, whether now |
| 1082 | * the final checksum succeedes. But this would be a rare |
| 1083 | * exception and is therefore not implemented. At least it is |
| 1084 | * avoided that the good copy is overwritten. |
| 1085 | * A more useful improvement would be to pick the sectors |
| 1086 | * without I/O error based on sector sizes (512 bytes on legacy |
| 1087 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one |
| 1088 | * mirror could be repaired by taking 512 byte of a different |
| 1089 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE |
| 1090 | * area are unreadable. |
| 1091 | */ |
| 1092 | |
| 1093 | /* can only fix I/O errors from here on */ |
| 1094 | if (sblock_bad->no_io_error_seen) |
| 1095 | goto did_not_correct_error; |
| 1096 | |
| 1097 | success = 1; |
| 1098 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1099 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1100 | |
| 1101 | if (!page_bad->io_error) |
| 1102 | continue; |
| 1103 | |
| 1104 | for (mirror_index = 0; |
| 1105 | mirror_index < BTRFS_MAX_MIRRORS && |
| 1106 | sblocks_for_recheck[mirror_index].page_count > 0; |
| 1107 | mirror_index++) { |
| 1108 | struct scrub_block *sblock_other = sblocks_for_recheck + |
| 1109 | mirror_index; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1110 | struct scrub_page *page_other = sblock_other->pagev[ |
| 1111 | page_num]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1112 | |
| 1113 | if (!page_other->io_error) { |
| 1114 | ret = scrub_repair_page_from_good_copy( |
| 1115 | sblock_bad, sblock_other, page_num, 0); |
| 1116 | if (0 == ret) { |
| 1117 | page_bad->io_error = 0; |
| 1118 | break; /* succeeded for this page */ |
| 1119 | } |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 1120 | } |
| 1121 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1122 | |
| 1123 | if (page_bad->io_error) { |
| 1124 | /* did not find a mirror to copy the page from */ |
| 1125 | success = 0; |
| 1126 | } |
| 1127 | } |
| 1128 | |
| 1129 | if (success) { |
| 1130 | if (is_metadata || have_csum) { |
| 1131 | /* |
| 1132 | * need to verify the checksum now that all |
| 1133 | * sectors on disk are repaired (the write |
| 1134 | * request for data to be repaired is on its way). |
| 1135 | * Just be lazy and use scrub_recheck_block() |
| 1136 | * which re-reads the data before the checksum |
| 1137 | * is verified, but most likely the data comes out |
| 1138 | * of the page cache. |
| 1139 | */ |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1140 | scrub_recheck_block(fs_info, sblock_bad, |
| 1141 | is_metadata, have_csum, csum, |
| 1142 | generation, sctx->csum_size); |
| 1143 | if (!sblock_bad->header_error && |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1144 | !sblock_bad->checksum_error && |
| 1145 | sblock_bad->no_io_error_seen) |
| 1146 | goto corrected_error; |
| 1147 | else |
| 1148 | goto did_not_correct_error; |
| 1149 | } else { |
| 1150 | corrected_error: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1151 | spin_lock(&sctx->stat_lock); |
| 1152 | sctx->stat.corrected_errors++; |
| 1153 | spin_unlock(&sctx->stat_lock); |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 1154 | printk_ratelimited_in_rcu(KERN_ERR |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1155 | "btrfs: fixed up error at logical %llu on dev %s\n", |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 1156 | (unsigned long long)logical, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1157 | rcu_str_deref(dev->name)); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1158 | } |
| 1159 | } else { |
| 1160 | did_not_correct_error: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1161 | spin_lock(&sctx->stat_lock); |
| 1162 | sctx->stat.uncorrectable_errors++; |
| 1163 | spin_unlock(&sctx->stat_lock); |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 1164 | printk_ratelimited_in_rcu(KERN_ERR |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1165 | "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] | 1166 | (unsigned long long)logical, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1167 | rcu_str_deref(dev->name)); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1168 | } |
| 1169 | |
| 1170 | out: |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1171 | if (sblocks_for_recheck) { |
| 1172 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; |
| 1173 | mirror_index++) { |
| 1174 | struct scrub_block *sblock = sblocks_for_recheck + |
| 1175 | mirror_index; |
| 1176 | int page_index; |
| 1177 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1178 | for (page_index = 0; page_index < sblock->page_count; |
| 1179 | page_index++) { |
| 1180 | sblock->pagev[page_index]->sblock = NULL; |
| 1181 | scrub_page_put(sblock->pagev[page_index]); |
| 1182 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1183 | } |
| 1184 | kfree(sblocks_for_recheck); |
| 1185 | } |
| 1186 | |
| 1187 | return 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1188 | } |
| 1189 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1190 | static int scrub_setup_recheck_block(struct scrub_ctx *sctx, |
Stefan Behrens | 3ec706c | 2012-11-05 15:46:42 +0100 | [diff] [blame] | 1191 | struct btrfs_fs_info *fs_info, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1192 | struct scrub_block *original_sblock, |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1193 | u64 length, u64 logical, |
| 1194 | struct scrub_block *sblocks_for_recheck) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1195 | { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1196 | int page_index; |
| 1197 | int mirror_index; |
| 1198 | int ret; |
| 1199 | |
| 1200 | /* |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1201 | * note: the two members ref_count and outstanding_pages |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1202 | * are not used (and not set) in the blocks that are used for |
| 1203 | * the recheck procedure |
| 1204 | */ |
| 1205 | |
| 1206 | page_index = 0; |
| 1207 | while (length > 0) { |
| 1208 | u64 sublen = min_t(u64, length, PAGE_SIZE); |
| 1209 | u64 mapped_length = sublen; |
| 1210 | struct btrfs_bio *bbio = NULL; |
| 1211 | |
| 1212 | /* |
| 1213 | * with a length of PAGE_SIZE, each returned stripe |
| 1214 | * represents one mirror |
| 1215 | */ |
Stefan Behrens | 29a8d9a | 2012-11-06 14:16:24 +0100 | [diff] [blame] | 1216 | ret = btrfs_map_block(fs_info, REQ_GET_READ_MIRRORS, logical, |
| 1217 | &mapped_length, &bbio, 0); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1218 | if (ret || !bbio || mapped_length < sublen) { |
| 1219 | kfree(bbio); |
| 1220 | return -EIO; |
| 1221 | } |
| 1222 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1223 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1224 | for (mirror_index = 0; mirror_index < (int)bbio->num_stripes; |
| 1225 | mirror_index++) { |
| 1226 | struct scrub_block *sblock; |
| 1227 | struct scrub_page *page; |
| 1228 | |
| 1229 | if (mirror_index >= BTRFS_MAX_MIRRORS) |
| 1230 | continue; |
| 1231 | |
| 1232 | sblock = sblocks_for_recheck + mirror_index; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1233 | sblock->sctx = sctx; |
| 1234 | page = kzalloc(sizeof(*page), GFP_NOFS); |
| 1235 | if (!page) { |
| 1236 | leave_nomem: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1237 | spin_lock(&sctx->stat_lock); |
| 1238 | sctx->stat.malloc_errors++; |
| 1239 | spin_unlock(&sctx->stat_lock); |
Wei Yongjun | cf93dcc | 2012-09-02 07:44:51 -0600 | [diff] [blame] | 1240 | kfree(bbio); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1241 | return -ENOMEM; |
| 1242 | } |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1243 | scrub_page_get(page); |
| 1244 | sblock->pagev[page_index] = page; |
| 1245 | page->logical = logical; |
| 1246 | page->physical = bbio->stripes[mirror_index].physical; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1247 | BUG_ON(page_index >= original_sblock->page_count); |
| 1248 | page->physical_for_dev_replace = |
| 1249 | original_sblock->pagev[page_index]-> |
| 1250 | physical_for_dev_replace; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1251 | /* for missing devices, dev->bdev is NULL */ |
| 1252 | page->dev = bbio->stripes[mirror_index].dev; |
| 1253 | page->mirror_num = mirror_index + 1; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1254 | sblock->page_count++; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1255 | page->page = alloc_page(GFP_NOFS); |
| 1256 | if (!page->page) |
| 1257 | goto leave_nomem; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1258 | } |
| 1259 | kfree(bbio); |
| 1260 | length -= sublen; |
| 1261 | logical += sublen; |
| 1262 | page_index++; |
| 1263 | } |
| 1264 | |
| 1265 | return 0; |
| 1266 | } |
| 1267 | |
| 1268 | /* |
| 1269 | * this function will check the on disk data for checksum errors, header |
| 1270 | * errors and read I/O errors. If any I/O errors happen, the exact pages |
| 1271 | * which are errored are marked as being bad. The goal is to enable scrub |
| 1272 | * to take those pages that are not errored from all the mirrors so that |
| 1273 | * the pages that are errored in the just handled mirror can be repaired. |
| 1274 | */ |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1275 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
| 1276 | struct scrub_block *sblock, int is_metadata, |
| 1277 | int have_csum, u8 *csum, u64 generation, |
| 1278 | u16 csum_size) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1279 | { |
| 1280 | int page_num; |
| 1281 | |
| 1282 | sblock->no_io_error_seen = 1; |
| 1283 | sblock->header_error = 0; |
| 1284 | sblock->checksum_error = 0; |
| 1285 | |
| 1286 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
| 1287 | struct bio *bio; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1288 | struct scrub_page *page = sblock->pagev[page_num]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1289 | DECLARE_COMPLETION_ONSTACK(complete); |
| 1290 | |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1291 | if (page->dev->bdev == NULL) { |
Stefan Behrens | ea9947b | 2012-05-04 15:16:07 -0400 | [diff] [blame] | 1292 | page->io_error = 1; |
| 1293 | sblock->no_io_error_seen = 0; |
| 1294 | continue; |
| 1295 | } |
| 1296 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1297 | WARN_ON(!page->page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1298 | bio = bio_alloc(GFP_NOFS, 1); |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1299 | if (!bio) { |
| 1300 | page->io_error = 1; |
| 1301 | sblock->no_io_error_seen = 0; |
| 1302 | continue; |
| 1303 | } |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1304 | bio->bi_bdev = page->dev->bdev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1305 | bio->bi_sector = page->physical >> 9; |
| 1306 | bio->bi_end_io = scrub_complete_bio_end_io; |
| 1307 | bio->bi_private = &complete; |
| 1308 | |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1309 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1310 | btrfsic_submit_bio(READ, bio); |
| 1311 | |
| 1312 | /* this will also unplug the queue */ |
| 1313 | wait_for_completion(&complete); |
| 1314 | |
| 1315 | page->io_error = !test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 1316 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) |
| 1317 | sblock->no_io_error_seen = 0; |
| 1318 | bio_put(bio); |
| 1319 | } |
| 1320 | |
| 1321 | if (sblock->no_io_error_seen) |
| 1322 | scrub_recheck_block_checksum(fs_info, sblock, is_metadata, |
| 1323 | have_csum, csum, generation, |
| 1324 | csum_size); |
| 1325 | |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1326 | return; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1327 | } |
| 1328 | |
| 1329 | static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info, |
| 1330 | struct scrub_block *sblock, |
| 1331 | int is_metadata, int have_csum, |
| 1332 | const u8 *csum, u64 generation, |
| 1333 | u16 csum_size) |
| 1334 | { |
| 1335 | int page_num; |
| 1336 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
| 1337 | u32 crc = ~(u32)0; |
| 1338 | struct btrfs_root *root = fs_info->extent_root; |
| 1339 | void *mapped_buffer; |
| 1340 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1341 | WARN_ON(!sblock->pagev[0]->page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1342 | if (is_metadata) { |
| 1343 | struct btrfs_header *h; |
| 1344 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1345 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1346 | h = (struct btrfs_header *)mapped_buffer; |
| 1347 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1348 | if (sblock->pagev[0]->logical != le64_to_cpu(h->bytenr) || |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1349 | memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE) || |
| 1350 | memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1351 | BTRFS_UUID_SIZE)) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1352 | sblock->header_error = 1; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1353 | } else if (generation != le64_to_cpu(h->generation)) { |
| 1354 | sblock->header_error = 1; |
| 1355 | sblock->generation_error = 1; |
| 1356 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1357 | csum = h->csum; |
| 1358 | } else { |
| 1359 | if (!have_csum) |
| 1360 | return; |
| 1361 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1362 | mapped_buffer = kmap_atomic(sblock->pagev[0]->page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1363 | } |
| 1364 | |
| 1365 | for (page_num = 0;;) { |
| 1366 | if (page_num == 0 && is_metadata) |
| 1367 | crc = btrfs_csum_data(root, |
| 1368 | ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE, |
| 1369 | crc, PAGE_SIZE - BTRFS_CSUM_SIZE); |
| 1370 | else |
| 1371 | crc = btrfs_csum_data(root, mapped_buffer, crc, |
| 1372 | PAGE_SIZE); |
| 1373 | |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1374 | kunmap_atomic(mapped_buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1375 | page_num++; |
| 1376 | if (page_num >= sblock->page_count) |
| 1377 | break; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1378 | WARN_ON(!sblock->pagev[page_num]->page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1379 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1380 | mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1381 | } |
| 1382 | |
| 1383 | btrfs_csum_final(crc, calculated_csum); |
| 1384 | if (memcmp(calculated_csum, csum, csum_size)) |
| 1385 | sblock->checksum_error = 1; |
| 1386 | } |
| 1387 | |
| 1388 | static void scrub_complete_bio_end_io(struct bio *bio, int err) |
| 1389 | { |
| 1390 | complete((struct completion *)bio->bi_private); |
| 1391 | } |
| 1392 | |
| 1393 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
| 1394 | struct scrub_block *sblock_good, |
| 1395 | int force_write) |
| 1396 | { |
| 1397 | int page_num; |
| 1398 | int ret = 0; |
| 1399 | |
| 1400 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
| 1401 | int ret_sub; |
| 1402 | |
| 1403 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
| 1404 | sblock_good, |
| 1405 | page_num, |
| 1406 | force_write); |
| 1407 | if (ret_sub) |
| 1408 | ret = ret_sub; |
| 1409 | } |
| 1410 | |
| 1411 | return ret; |
| 1412 | } |
| 1413 | |
| 1414 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
| 1415 | struct scrub_block *sblock_good, |
| 1416 | int page_num, int force_write) |
| 1417 | { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1418 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
| 1419 | struct scrub_page *page_good = sblock_good->pagev[page_num]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1420 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1421 | BUG_ON(page_bad->page == NULL); |
| 1422 | BUG_ON(page_good->page == NULL); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1423 | if (force_write || sblock_bad->header_error || |
| 1424 | sblock_bad->checksum_error || page_bad->io_error) { |
| 1425 | struct bio *bio; |
| 1426 | int ret; |
| 1427 | DECLARE_COMPLETION_ONSTACK(complete); |
| 1428 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1429 | if (!page_bad->dev->bdev) { |
| 1430 | printk_ratelimited(KERN_WARNING |
| 1431 | "btrfs: scrub_repair_page_from_good_copy(bdev == NULL) is unexpected!\n"); |
| 1432 | return -EIO; |
| 1433 | } |
| 1434 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1435 | bio = bio_alloc(GFP_NOFS, 1); |
Tsutomu Itoh | e627ee7 | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 1436 | if (!bio) |
| 1437 | return -EIO; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1438 | bio->bi_bdev = page_bad->dev->bdev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1439 | bio->bi_sector = page_bad->physical >> 9; |
| 1440 | bio->bi_end_io = scrub_complete_bio_end_io; |
| 1441 | bio->bi_private = &complete; |
| 1442 | |
| 1443 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); |
| 1444 | if (PAGE_SIZE != ret) { |
| 1445 | bio_put(bio); |
| 1446 | return -EIO; |
| 1447 | } |
| 1448 | btrfsic_submit_bio(WRITE, bio); |
| 1449 | |
| 1450 | /* this will also unplug the queue */ |
| 1451 | wait_for_completion(&complete); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1452 | if (!bio_flagged(bio, BIO_UPTODATE)) { |
| 1453 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
| 1454 | BTRFS_DEV_STAT_WRITE_ERRS); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1455 | btrfs_dev_replace_stats_inc( |
| 1456 | &sblock_bad->sctx->dev_root->fs_info-> |
| 1457 | dev_replace.num_write_errors); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1458 | bio_put(bio); |
| 1459 | return -EIO; |
| 1460 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1461 | bio_put(bio); |
| 1462 | } |
| 1463 | |
| 1464 | return 0; |
| 1465 | } |
| 1466 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1467 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
| 1468 | { |
| 1469 | int page_num; |
| 1470 | |
| 1471 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
| 1472 | int ret; |
| 1473 | |
| 1474 | ret = scrub_write_page_to_dev_replace(sblock, page_num); |
| 1475 | if (ret) |
| 1476 | btrfs_dev_replace_stats_inc( |
| 1477 | &sblock->sctx->dev_root->fs_info->dev_replace. |
| 1478 | num_write_errors); |
| 1479 | } |
| 1480 | } |
| 1481 | |
| 1482 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, |
| 1483 | int page_num) |
| 1484 | { |
| 1485 | struct scrub_page *spage = sblock->pagev[page_num]; |
| 1486 | |
| 1487 | BUG_ON(spage->page == NULL); |
| 1488 | if (spage->io_error) { |
| 1489 | void *mapped_buffer = kmap_atomic(spage->page); |
| 1490 | |
| 1491 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); |
| 1492 | flush_dcache_page(spage->page); |
| 1493 | kunmap_atomic(mapped_buffer); |
| 1494 | } |
| 1495 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); |
| 1496 | } |
| 1497 | |
| 1498 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, |
| 1499 | struct scrub_page *spage) |
| 1500 | { |
| 1501 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; |
| 1502 | struct scrub_bio *sbio; |
| 1503 | int ret; |
| 1504 | |
| 1505 | mutex_lock(&wr_ctx->wr_lock); |
| 1506 | again: |
| 1507 | if (!wr_ctx->wr_curr_bio) { |
| 1508 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), |
| 1509 | GFP_NOFS); |
| 1510 | if (!wr_ctx->wr_curr_bio) { |
| 1511 | mutex_unlock(&wr_ctx->wr_lock); |
| 1512 | return -ENOMEM; |
| 1513 | } |
| 1514 | wr_ctx->wr_curr_bio->sctx = sctx; |
| 1515 | wr_ctx->wr_curr_bio->page_count = 0; |
| 1516 | } |
| 1517 | sbio = wr_ctx->wr_curr_bio; |
| 1518 | if (sbio->page_count == 0) { |
| 1519 | struct bio *bio; |
| 1520 | |
| 1521 | sbio->physical = spage->physical_for_dev_replace; |
| 1522 | sbio->logical = spage->logical; |
| 1523 | sbio->dev = wr_ctx->tgtdev; |
| 1524 | bio = sbio->bio; |
| 1525 | if (!bio) { |
| 1526 | bio = bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio); |
| 1527 | if (!bio) { |
| 1528 | mutex_unlock(&wr_ctx->wr_lock); |
| 1529 | return -ENOMEM; |
| 1530 | } |
| 1531 | sbio->bio = bio; |
| 1532 | } |
| 1533 | |
| 1534 | bio->bi_private = sbio; |
| 1535 | bio->bi_end_io = scrub_wr_bio_end_io; |
| 1536 | bio->bi_bdev = sbio->dev->bdev; |
| 1537 | bio->bi_sector = sbio->physical >> 9; |
| 1538 | sbio->err = 0; |
| 1539 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
| 1540 | spage->physical_for_dev_replace || |
| 1541 | sbio->logical + sbio->page_count * PAGE_SIZE != |
| 1542 | spage->logical) { |
| 1543 | scrub_wr_submit(sctx); |
| 1544 | goto again; |
| 1545 | } |
| 1546 | |
| 1547 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); |
| 1548 | if (ret != PAGE_SIZE) { |
| 1549 | if (sbio->page_count < 1) { |
| 1550 | bio_put(sbio->bio); |
| 1551 | sbio->bio = NULL; |
| 1552 | mutex_unlock(&wr_ctx->wr_lock); |
| 1553 | return -EIO; |
| 1554 | } |
| 1555 | scrub_wr_submit(sctx); |
| 1556 | goto again; |
| 1557 | } |
| 1558 | |
| 1559 | sbio->pagev[sbio->page_count] = spage; |
| 1560 | scrub_page_get(spage); |
| 1561 | sbio->page_count++; |
| 1562 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) |
| 1563 | scrub_wr_submit(sctx); |
| 1564 | mutex_unlock(&wr_ctx->wr_lock); |
| 1565 | |
| 1566 | return 0; |
| 1567 | } |
| 1568 | |
| 1569 | static void scrub_wr_submit(struct scrub_ctx *sctx) |
| 1570 | { |
| 1571 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; |
| 1572 | struct scrub_bio *sbio; |
| 1573 | |
| 1574 | if (!wr_ctx->wr_curr_bio) |
| 1575 | return; |
| 1576 | |
| 1577 | sbio = wr_ctx->wr_curr_bio; |
| 1578 | wr_ctx->wr_curr_bio = NULL; |
| 1579 | WARN_ON(!sbio->bio->bi_bdev); |
| 1580 | scrub_pending_bio_inc(sctx); |
| 1581 | /* process all writes in a single worker thread. Then the block layer |
| 1582 | * orders the requests before sending them to the driver which |
| 1583 | * doubled the write performance on spinning disks when measured |
| 1584 | * with Linux 3.5 */ |
| 1585 | btrfsic_submit_bio(WRITE, sbio->bio); |
| 1586 | } |
| 1587 | |
| 1588 | static void scrub_wr_bio_end_io(struct bio *bio, int err) |
| 1589 | { |
| 1590 | struct scrub_bio *sbio = bio->bi_private; |
| 1591 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
| 1592 | |
| 1593 | sbio->err = err; |
| 1594 | sbio->bio = bio; |
| 1595 | |
| 1596 | sbio->work.func = scrub_wr_bio_end_io_worker; |
| 1597 | btrfs_queue_worker(&fs_info->scrub_wr_completion_workers, &sbio->work); |
| 1598 | } |
| 1599 | |
| 1600 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) |
| 1601 | { |
| 1602 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); |
| 1603 | struct scrub_ctx *sctx = sbio->sctx; |
| 1604 | int i; |
| 1605 | |
| 1606 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); |
| 1607 | if (sbio->err) { |
| 1608 | struct btrfs_dev_replace *dev_replace = |
| 1609 | &sbio->sctx->dev_root->fs_info->dev_replace; |
| 1610 | |
| 1611 | for (i = 0; i < sbio->page_count; i++) { |
| 1612 | struct scrub_page *spage = sbio->pagev[i]; |
| 1613 | |
| 1614 | spage->io_error = 1; |
| 1615 | btrfs_dev_replace_stats_inc(&dev_replace-> |
| 1616 | num_write_errors); |
| 1617 | } |
| 1618 | } |
| 1619 | |
| 1620 | for (i = 0; i < sbio->page_count; i++) |
| 1621 | scrub_page_put(sbio->pagev[i]); |
| 1622 | |
| 1623 | bio_put(sbio->bio); |
| 1624 | kfree(sbio); |
| 1625 | scrub_pending_bio_dec(sctx); |
| 1626 | } |
| 1627 | |
| 1628 | static int scrub_checksum(struct scrub_block *sblock) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1629 | { |
| 1630 | u64 flags; |
| 1631 | int ret; |
| 1632 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1633 | WARN_ON(sblock->page_count < 1); |
| 1634 | flags = sblock->pagev[0]->flags; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1635 | ret = 0; |
| 1636 | if (flags & BTRFS_EXTENT_FLAG_DATA) |
| 1637 | ret = scrub_checksum_data(sblock); |
| 1638 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) |
| 1639 | ret = scrub_checksum_tree_block(sblock); |
| 1640 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) |
| 1641 | (void)scrub_checksum_super(sblock); |
| 1642 | else |
| 1643 | WARN_ON(1); |
| 1644 | if (ret) |
| 1645 | scrub_handle_errored_block(sblock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1646 | |
| 1647 | return ret; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1648 | } |
| 1649 | |
| 1650 | static int scrub_checksum_data(struct scrub_block *sblock) |
| 1651 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1652 | struct scrub_ctx *sctx = sblock->sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1653 | u8 csum[BTRFS_CSUM_SIZE]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1654 | u8 *on_disk_csum; |
| 1655 | struct page *page; |
| 1656 | void *buffer; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1657 | u32 crc = ~(u32)0; |
| 1658 | int fail = 0; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1659 | struct btrfs_root *root = sctx->dev_root; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1660 | u64 len; |
| 1661 | int index; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1662 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1663 | BUG_ON(sblock->page_count < 1); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1664 | if (!sblock->pagev[0]->have_csum) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1665 | return 0; |
| 1666 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1667 | on_disk_csum = sblock->pagev[0]->csum; |
| 1668 | page = sblock->pagev[0]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1669 | buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1670 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1671 | len = sctx->sectorsize; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1672 | index = 0; |
| 1673 | for (;;) { |
| 1674 | u64 l = min_t(u64, len, PAGE_SIZE); |
| 1675 | |
| 1676 | crc = btrfs_csum_data(root, buffer, crc, l); |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1677 | kunmap_atomic(buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1678 | len -= l; |
| 1679 | if (len == 0) |
| 1680 | break; |
| 1681 | index++; |
| 1682 | BUG_ON(index >= sblock->page_count); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1683 | BUG_ON(!sblock->pagev[index]->page); |
| 1684 | page = sblock->pagev[index]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1685 | buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1686 | } |
| 1687 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1688 | btrfs_csum_final(crc, csum); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1689 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1690 | fail = 1; |
| 1691 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1692 | return fail; |
| 1693 | } |
| 1694 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1695 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1696 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1697 | struct scrub_ctx *sctx = sblock->sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1698 | struct btrfs_header *h; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1699 | struct btrfs_root *root = sctx->dev_root; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1700 | struct btrfs_fs_info *fs_info = root->fs_info; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1701 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
| 1702 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; |
| 1703 | struct page *page; |
| 1704 | void *mapped_buffer; |
| 1705 | u64 mapped_size; |
| 1706 | void *p; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1707 | u32 crc = ~(u32)0; |
| 1708 | int fail = 0; |
| 1709 | int crc_fail = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1710 | u64 len; |
| 1711 | int index; |
| 1712 | |
| 1713 | BUG_ON(sblock->page_count < 1); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1714 | page = sblock->pagev[0]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1715 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1716 | h = (struct btrfs_header *)mapped_buffer; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1717 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1718 | |
| 1719 | /* |
| 1720 | * we don't use the getter functions here, as we |
| 1721 | * a) don't have an extent buffer and |
| 1722 | * b) the page is already kmapped |
| 1723 | */ |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1724 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1725 | if (sblock->pagev[0]->logical != le64_to_cpu(h->bytenr)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1726 | ++fail; |
| 1727 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1728 | if (sblock->pagev[0]->generation != le64_to_cpu(h->generation)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1729 | ++fail; |
| 1730 | |
| 1731 | if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) |
| 1732 | ++fail; |
| 1733 | |
| 1734 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
| 1735 | BTRFS_UUID_SIZE)) |
| 1736 | ++fail; |
| 1737 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1738 | WARN_ON(sctx->nodesize != sctx->leafsize); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1739 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1740 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
| 1741 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; |
| 1742 | index = 0; |
| 1743 | for (;;) { |
| 1744 | u64 l = min_t(u64, len, mapped_size); |
| 1745 | |
| 1746 | crc = btrfs_csum_data(root, p, crc, l); |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1747 | kunmap_atomic(mapped_buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1748 | len -= l; |
| 1749 | if (len == 0) |
| 1750 | break; |
| 1751 | index++; |
| 1752 | BUG_ON(index >= sblock->page_count); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1753 | BUG_ON(!sblock->pagev[index]->page); |
| 1754 | page = sblock->pagev[index]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1755 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1756 | mapped_size = PAGE_SIZE; |
| 1757 | p = mapped_buffer; |
| 1758 | } |
| 1759 | |
| 1760 | btrfs_csum_final(crc, calculated_csum); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1761 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1762 | ++crc_fail; |
| 1763 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1764 | return fail || crc_fail; |
| 1765 | } |
| 1766 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1767 | static int scrub_checksum_super(struct scrub_block *sblock) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1768 | { |
| 1769 | struct btrfs_super_block *s; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1770 | struct scrub_ctx *sctx = sblock->sctx; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1771 | struct btrfs_root *root = sctx->dev_root; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1772 | struct btrfs_fs_info *fs_info = root->fs_info; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1773 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
| 1774 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; |
| 1775 | struct page *page; |
| 1776 | void *mapped_buffer; |
| 1777 | u64 mapped_size; |
| 1778 | void *p; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1779 | u32 crc = ~(u32)0; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1780 | int fail_gen = 0; |
| 1781 | int fail_cor = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1782 | u64 len; |
| 1783 | int index; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1784 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1785 | BUG_ON(sblock->page_count < 1); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1786 | page = sblock->pagev[0]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1787 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1788 | s = (struct btrfs_super_block *)mapped_buffer; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1789 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1790 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1791 | if (sblock->pagev[0]->logical != le64_to_cpu(s->bytenr)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1792 | ++fail_cor; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1793 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1794 | if (sblock->pagev[0]->generation != le64_to_cpu(s->generation)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1795 | ++fail_gen; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1796 | |
| 1797 | if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1798 | ++fail_cor; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1799 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1800 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
| 1801 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
| 1802 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; |
| 1803 | index = 0; |
| 1804 | for (;;) { |
| 1805 | u64 l = min_t(u64, len, mapped_size); |
| 1806 | |
| 1807 | crc = btrfs_csum_data(root, p, crc, l); |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1808 | kunmap_atomic(mapped_buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1809 | len -= l; |
| 1810 | if (len == 0) |
| 1811 | break; |
| 1812 | index++; |
| 1813 | BUG_ON(index >= sblock->page_count); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1814 | BUG_ON(!sblock->pagev[index]->page); |
| 1815 | page = sblock->pagev[index]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1816 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1817 | mapped_size = PAGE_SIZE; |
| 1818 | p = mapped_buffer; |
| 1819 | } |
| 1820 | |
| 1821 | btrfs_csum_final(crc, calculated_csum); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1822 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1823 | ++fail_cor; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1824 | |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1825 | if (fail_cor + fail_gen) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1826 | /* |
| 1827 | * if we find an error in a super block, we just report it. |
| 1828 | * They will get written with the next transaction commit |
| 1829 | * anyway |
| 1830 | */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1831 | spin_lock(&sctx->stat_lock); |
| 1832 | ++sctx->stat.super_errors; |
| 1833 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1834 | if (fail_cor) |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1835 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1836 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
| 1837 | else |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1838 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1839 | BTRFS_DEV_STAT_GENERATION_ERRS); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1840 | } |
| 1841 | |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1842 | return fail_cor + fail_gen; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1843 | } |
| 1844 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1845 | static void scrub_block_get(struct scrub_block *sblock) |
| 1846 | { |
| 1847 | atomic_inc(&sblock->ref_count); |
| 1848 | } |
| 1849 | |
| 1850 | static void scrub_block_put(struct scrub_block *sblock) |
| 1851 | { |
| 1852 | if (atomic_dec_and_test(&sblock->ref_count)) { |
| 1853 | int i; |
| 1854 | |
| 1855 | for (i = 0; i < sblock->page_count; i++) |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1856 | scrub_page_put(sblock->pagev[i]); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1857 | kfree(sblock); |
| 1858 | } |
| 1859 | } |
| 1860 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1861 | static void scrub_page_get(struct scrub_page *spage) |
| 1862 | { |
| 1863 | atomic_inc(&spage->ref_count); |
| 1864 | } |
| 1865 | |
| 1866 | static void scrub_page_put(struct scrub_page *spage) |
| 1867 | { |
| 1868 | if (atomic_dec_and_test(&spage->ref_count)) { |
| 1869 | if (spage->page) |
| 1870 | __free_page(spage->page); |
| 1871 | kfree(spage); |
| 1872 | } |
| 1873 | } |
| 1874 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1875 | static void scrub_submit(struct scrub_ctx *sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1876 | { |
| 1877 | struct scrub_bio *sbio; |
| 1878 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1879 | if (sctx->curr == -1) |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 1880 | return; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1881 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1882 | sbio = sctx->bios[sctx->curr]; |
| 1883 | sctx->curr = -1; |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 1884 | scrub_pending_bio_inc(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1885 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1886 | if (!sbio->bio->bi_bdev) { |
| 1887 | /* |
| 1888 | * this case should not happen. If btrfs_map_block() is |
| 1889 | * wrong, it could happen for dev-replace operations on |
| 1890 | * missing devices when no mirrors are available, but in |
| 1891 | * this case it should already fail the mount. |
| 1892 | * This case is handled correctly (but _very_ slowly). |
| 1893 | */ |
| 1894 | printk_ratelimited(KERN_WARNING |
| 1895 | "btrfs: scrub_submit(bio bdev == NULL) is unexpected!\n"); |
| 1896 | bio_endio(sbio->bio, -EIO); |
| 1897 | } else { |
| 1898 | btrfsic_submit_bio(READ, sbio->bio); |
| 1899 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1900 | } |
| 1901 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1902 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
| 1903 | struct scrub_page *spage) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1904 | { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1905 | struct scrub_block *sblock = spage->sblock; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1906 | struct scrub_bio *sbio; |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1907 | int ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1908 | |
| 1909 | again: |
| 1910 | /* |
| 1911 | * grab a fresh bio or wait for one to become available |
| 1912 | */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1913 | while (sctx->curr == -1) { |
| 1914 | spin_lock(&sctx->list_lock); |
| 1915 | sctx->curr = sctx->first_free; |
| 1916 | if (sctx->curr != -1) { |
| 1917 | sctx->first_free = sctx->bios[sctx->curr]->next_free; |
| 1918 | sctx->bios[sctx->curr]->next_free = -1; |
| 1919 | sctx->bios[sctx->curr]->page_count = 0; |
| 1920 | spin_unlock(&sctx->list_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1921 | } else { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1922 | spin_unlock(&sctx->list_lock); |
| 1923 | wait_event(sctx->list_wait, sctx->first_free != -1); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1924 | } |
| 1925 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1926 | sbio = sctx->bios[sctx->curr]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1927 | if (sbio->page_count == 0) { |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1928 | struct bio *bio; |
| 1929 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1930 | sbio->physical = spage->physical; |
| 1931 | sbio->logical = spage->logical; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1932 | sbio->dev = spage->dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1933 | bio = sbio->bio; |
| 1934 | if (!bio) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1935 | bio = bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1936 | if (!bio) |
| 1937 | return -ENOMEM; |
| 1938 | sbio->bio = bio; |
| 1939 | } |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1940 | |
| 1941 | bio->bi_private = sbio; |
| 1942 | bio->bi_end_io = scrub_bio_end_io; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1943 | bio->bi_bdev = sbio->dev->bdev; |
| 1944 | bio->bi_sector = sbio->physical >> 9; |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1945 | sbio->err = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1946 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
| 1947 | spage->physical || |
| 1948 | sbio->logical + sbio->page_count * PAGE_SIZE != |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1949 | spage->logical || |
| 1950 | sbio->dev != spage->dev) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1951 | scrub_submit(sctx); |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 1952 | goto again; |
| 1953 | } |
| 1954 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1955 | sbio->pagev[sbio->page_count] = spage; |
| 1956 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); |
| 1957 | if (ret != PAGE_SIZE) { |
| 1958 | if (sbio->page_count < 1) { |
| 1959 | bio_put(sbio->bio); |
| 1960 | sbio->bio = NULL; |
| 1961 | return -EIO; |
| 1962 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1963 | scrub_submit(sctx); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1964 | goto again; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1965 | } |
Arne Jansen | 1bc8779 | 2011-05-28 21:57:55 +0200 | [diff] [blame] | 1966 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1967 | scrub_block_get(sblock); /* one for the page added to the bio */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1968 | atomic_inc(&sblock->outstanding_pages); |
| 1969 | sbio->page_count++; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1970 | if (sbio->page_count == sctx->pages_per_rd_bio) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1971 | scrub_submit(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1972 | |
| 1973 | return 0; |
| 1974 | } |
| 1975 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1976 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1977 | u64 physical, struct btrfs_device *dev, u64 flags, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1978 | u64 gen, int mirror_num, u8 *csum, int force, |
| 1979 | u64 physical_for_dev_replace) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1980 | { |
| 1981 | struct scrub_block *sblock; |
| 1982 | int index; |
| 1983 | |
| 1984 | sblock = kzalloc(sizeof(*sblock), GFP_NOFS); |
| 1985 | if (!sblock) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1986 | spin_lock(&sctx->stat_lock); |
| 1987 | sctx->stat.malloc_errors++; |
| 1988 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1989 | return -ENOMEM; |
| 1990 | } |
| 1991 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1992 | /* one ref inside this function, plus one for each page added to |
| 1993 | * a bio later on */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1994 | atomic_set(&sblock->ref_count, 1); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1995 | sblock->sctx = sctx; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1996 | sblock->no_io_error_seen = 1; |
| 1997 | |
| 1998 | for (index = 0; len > 0; index++) { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1999 | struct scrub_page *spage; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2000 | u64 l = min_t(u64, len, PAGE_SIZE); |
| 2001 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2002 | spage = kzalloc(sizeof(*spage), GFP_NOFS); |
| 2003 | if (!spage) { |
| 2004 | leave_nomem: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2005 | spin_lock(&sctx->stat_lock); |
| 2006 | sctx->stat.malloc_errors++; |
| 2007 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2008 | scrub_block_put(sblock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2009 | return -ENOMEM; |
| 2010 | } |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2011 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
| 2012 | scrub_page_get(spage); |
| 2013 | sblock->pagev[index] = spage; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2014 | spage->sblock = sblock; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2015 | spage->dev = dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2016 | spage->flags = flags; |
| 2017 | spage->generation = gen; |
| 2018 | spage->logical = logical; |
| 2019 | spage->physical = physical; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2020 | spage->physical_for_dev_replace = physical_for_dev_replace; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2021 | spage->mirror_num = mirror_num; |
| 2022 | if (csum) { |
| 2023 | spage->have_csum = 1; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2024 | memcpy(spage->csum, csum, sctx->csum_size); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2025 | } else { |
| 2026 | spage->have_csum = 0; |
| 2027 | } |
| 2028 | sblock->page_count++; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2029 | spage->page = alloc_page(GFP_NOFS); |
| 2030 | if (!spage->page) |
| 2031 | goto leave_nomem; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2032 | len -= l; |
| 2033 | logical += l; |
| 2034 | physical += l; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2035 | physical_for_dev_replace += l; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2036 | } |
| 2037 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2038 | WARN_ON(sblock->page_count == 0); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2039 | for (index = 0; index < sblock->page_count; index++) { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2040 | struct scrub_page *spage = sblock->pagev[index]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2041 | int ret; |
| 2042 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2043 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2044 | if (ret) { |
| 2045 | scrub_block_put(sblock); |
| 2046 | return ret; |
| 2047 | } |
| 2048 | } |
| 2049 | |
| 2050 | if (force) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2051 | scrub_submit(sctx); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2052 | |
| 2053 | /* last one frees, either here or in bio completion for last page */ |
| 2054 | scrub_block_put(sblock); |
| 2055 | return 0; |
| 2056 | } |
| 2057 | |
| 2058 | static void scrub_bio_end_io(struct bio *bio, int err) |
| 2059 | { |
| 2060 | struct scrub_bio *sbio = bio->bi_private; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2061 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2062 | |
| 2063 | sbio->err = err; |
| 2064 | sbio->bio = bio; |
| 2065 | |
| 2066 | btrfs_queue_worker(&fs_info->scrub_workers, &sbio->work); |
| 2067 | } |
| 2068 | |
| 2069 | static void scrub_bio_end_io_worker(struct btrfs_work *work) |
| 2070 | { |
| 2071 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2072 | struct scrub_ctx *sctx = sbio->sctx; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2073 | int i; |
| 2074 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2075 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2076 | if (sbio->err) { |
| 2077 | for (i = 0; i < sbio->page_count; i++) { |
| 2078 | struct scrub_page *spage = sbio->pagev[i]; |
| 2079 | |
| 2080 | spage->io_error = 1; |
| 2081 | spage->sblock->no_io_error_seen = 0; |
| 2082 | } |
| 2083 | } |
| 2084 | |
| 2085 | /* now complete the scrub_block items that have all pages completed */ |
| 2086 | for (i = 0; i < sbio->page_count; i++) { |
| 2087 | struct scrub_page *spage = sbio->pagev[i]; |
| 2088 | struct scrub_block *sblock = spage->sblock; |
| 2089 | |
| 2090 | if (atomic_dec_and_test(&sblock->outstanding_pages)) |
| 2091 | scrub_block_complete(sblock); |
| 2092 | scrub_block_put(sblock); |
| 2093 | } |
| 2094 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2095 | bio_put(sbio->bio); |
| 2096 | sbio->bio = NULL; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2097 | spin_lock(&sctx->list_lock); |
| 2098 | sbio->next_free = sctx->first_free; |
| 2099 | sctx->first_free = sbio->index; |
| 2100 | spin_unlock(&sctx->list_lock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2101 | |
| 2102 | if (sctx->is_dev_replace && |
| 2103 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { |
| 2104 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 2105 | scrub_wr_submit(sctx); |
| 2106 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
| 2107 | } |
| 2108 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 2109 | scrub_pending_bio_dec(sctx); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2110 | } |
| 2111 | |
| 2112 | static void scrub_block_complete(struct scrub_block *sblock) |
| 2113 | { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2114 | if (!sblock->no_io_error_seen) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2115 | scrub_handle_errored_block(sblock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2116 | } else { |
| 2117 | /* |
| 2118 | * if has checksum error, write via repair mechanism in |
| 2119 | * dev replace case, otherwise write here in dev replace |
| 2120 | * case. |
| 2121 | */ |
| 2122 | if (!scrub_checksum(sblock) && sblock->sctx->is_dev_replace) |
| 2123 | scrub_write_block_to_dev_replace(sblock); |
| 2124 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2125 | } |
| 2126 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2127 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2128 | u8 *csum) |
| 2129 | { |
| 2130 | struct btrfs_ordered_sum *sum = NULL; |
| 2131 | int ret = 0; |
| 2132 | unsigned long i; |
| 2133 | unsigned long num_sectors; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2134 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2135 | while (!list_empty(&sctx->csum_list)) { |
| 2136 | sum = list_first_entry(&sctx->csum_list, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2137 | struct btrfs_ordered_sum, list); |
| 2138 | if (sum->bytenr > logical) |
| 2139 | return 0; |
| 2140 | if (sum->bytenr + sum->len > logical) |
| 2141 | break; |
| 2142 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2143 | ++sctx->stat.csum_discards; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2144 | list_del(&sum->list); |
| 2145 | kfree(sum); |
| 2146 | sum = NULL; |
| 2147 | } |
| 2148 | if (!sum) |
| 2149 | return 0; |
| 2150 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2151 | num_sectors = sum->len / sctx->sectorsize; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2152 | for (i = 0; i < num_sectors; ++i) { |
| 2153 | if (sum->sums[i].bytenr == logical) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2154 | memcpy(csum, &sum->sums[i].sum, sctx->csum_size); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2155 | ret = 1; |
| 2156 | break; |
| 2157 | } |
| 2158 | } |
| 2159 | if (ret && i == num_sectors - 1) { |
| 2160 | list_del(&sum->list); |
| 2161 | kfree(sum); |
| 2162 | } |
| 2163 | return ret; |
| 2164 | } |
| 2165 | |
| 2166 | /* scrub extent tries to collect up to 64 kB for each bio */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2167 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2168 | u64 physical, struct btrfs_device *dev, u64 flags, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2169 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2170 | { |
| 2171 | int ret; |
| 2172 | u8 csum[BTRFS_CSUM_SIZE]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2173 | u32 blocksize; |
| 2174 | |
| 2175 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2176 | blocksize = sctx->sectorsize; |
| 2177 | spin_lock(&sctx->stat_lock); |
| 2178 | sctx->stat.data_extents_scrubbed++; |
| 2179 | sctx->stat.data_bytes_scrubbed += len; |
| 2180 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2181 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2182 | WARN_ON(sctx->nodesize != sctx->leafsize); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2183 | blocksize = sctx->nodesize; |
| 2184 | spin_lock(&sctx->stat_lock); |
| 2185 | sctx->stat.tree_extents_scrubbed++; |
| 2186 | sctx->stat.tree_bytes_scrubbed += len; |
| 2187 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2188 | } else { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2189 | blocksize = sctx->sectorsize; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2190 | WARN_ON(1); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2191 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2192 | |
| 2193 | while (len) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2194 | u64 l = min_t(u64, len, blocksize); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2195 | int have_csum = 0; |
| 2196 | |
| 2197 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
| 2198 | /* push csums to sbio */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2199 | have_csum = scrub_find_csum(sctx, logical, l, csum); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2200 | if (have_csum == 0) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2201 | ++sctx->stat.no_csum; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2202 | if (sctx->is_dev_replace && !have_csum) { |
| 2203 | ret = copy_nocow_pages(sctx, logical, l, |
| 2204 | mirror_num, |
| 2205 | physical_for_dev_replace); |
| 2206 | goto behind_scrub_pages; |
| 2207 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2208 | } |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2209 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2210 | mirror_num, have_csum ? csum : NULL, 0, |
| 2211 | physical_for_dev_replace); |
| 2212 | behind_scrub_pages: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2213 | if (ret) |
| 2214 | return ret; |
| 2215 | len -= l; |
| 2216 | logical += l; |
| 2217 | physical += l; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2218 | physical_for_dev_replace += l; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2219 | } |
| 2220 | return 0; |
| 2221 | } |
| 2222 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2223 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2224 | struct map_lookup *map, |
| 2225 | struct btrfs_device *scrub_dev, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2226 | int num, u64 base, u64 length, |
| 2227 | int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2228 | { |
| 2229 | struct btrfs_path *path; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2230 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2231 | struct btrfs_root *root = fs_info->extent_root; |
| 2232 | struct btrfs_root *csum_root = fs_info->csum_root; |
| 2233 | struct btrfs_extent_item *extent; |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 2234 | struct blk_plug plug; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2235 | u64 flags; |
| 2236 | int ret; |
| 2237 | int slot; |
| 2238 | int i; |
| 2239 | u64 nstripes; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2240 | struct extent_buffer *l; |
| 2241 | struct btrfs_key key; |
| 2242 | u64 physical; |
| 2243 | u64 logical; |
| 2244 | u64 generation; |
Jan Schmidt | e12fa9c | 2011-06-17 15:55:21 +0200 | [diff] [blame] | 2245 | int mirror_num; |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2246 | struct reada_control *reada1; |
| 2247 | struct reada_control *reada2; |
| 2248 | struct btrfs_key key_start; |
| 2249 | struct btrfs_key key_end; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2250 | u64 increment = map->stripe_len; |
| 2251 | u64 offset; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2252 | u64 extent_logical; |
| 2253 | u64 extent_physical; |
| 2254 | u64 extent_len; |
| 2255 | struct btrfs_device *extent_dev; |
| 2256 | int extent_mirror_num; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2257 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2258 | if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | |
| 2259 | BTRFS_BLOCK_GROUP_RAID6)) { |
| 2260 | if (num >= nr_data_stripes(map)) { |
| 2261 | return 0; |
| 2262 | } |
| 2263 | } |
| 2264 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2265 | nstripes = length; |
| 2266 | offset = 0; |
| 2267 | do_div(nstripes, map->stripe_len); |
| 2268 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
| 2269 | offset = map->stripe_len * num; |
| 2270 | increment = map->stripe_len * map->num_stripes; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 2271 | mirror_num = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2272 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
| 2273 | int factor = map->num_stripes / map->sub_stripes; |
| 2274 | offset = map->stripe_len * (num / map->sub_stripes); |
| 2275 | increment = map->stripe_len * factor; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 2276 | mirror_num = num % map->sub_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2277 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
| 2278 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 2279 | mirror_num = num % map->num_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2280 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
| 2281 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 2282 | mirror_num = num % map->num_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2283 | } else { |
| 2284 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 2285 | mirror_num = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2286 | } |
| 2287 | |
| 2288 | path = btrfs_alloc_path(); |
| 2289 | if (!path) |
| 2290 | return -ENOMEM; |
| 2291 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2292 | /* |
| 2293 | * work on commit root. The related disk blocks are static as |
| 2294 | * long as COW is applied. This means, it is save to rewrite |
| 2295 | * them to repair disk errors without any race conditions |
| 2296 | */ |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2297 | path->search_commit_root = 1; |
| 2298 | path->skip_locking = 1; |
| 2299 | |
| 2300 | /* |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2301 | * trigger the readahead for extent tree csum tree and wait for |
| 2302 | * completion. During readahead, the scrub is officially paused |
| 2303 | * to not hold off transaction commits |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2304 | */ |
| 2305 | logical = base + offset; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2306 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2307 | wait_event(sctx->list_wait, |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 2308 | atomic_read(&sctx->bios_in_flight) == 0); |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2309 | atomic_inc(&fs_info->scrubs_paused); |
| 2310 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2311 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2312 | /* FIXME it might be better to start readahead at commit root */ |
| 2313 | key_start.objectid = logical; |
| 2314 | key_start.type = BTRFS_EXTENT_ITEM_KEY; |
| 2315 | key_start.offset = (u64)0; |
| 2316 | key_end.objectid = base + offset + nstripes * increment; |
| 2317 | key_end.type = BTRFS_EXTENT_ITEM_KEY; |
| 2318 | key_end.offset = (u64)0; |
| 2319 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2320 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2321 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 2322 | key_start.type = BTRFS_EXTENT_CSUM_KEY; |
| 2323 | key_start.offset = logical; |
| 2324 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 2325 | key_end.type = BTRFS_EXTENT_CSUM_KEY; |
| 2326 | key_end.offset = base + offset + nstripes * increment; |
| 2327 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2328 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2329 | if (!IS_ERR(reada1)) |
| 2330 | btrfs_reada_wait(reada1); |
| 2331 | if (!IS_ERR(reada2)) |
| 2332 | btrfs_reada_wait(reada2); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2333 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2334 | mutex_lock(&fs_info->scrub_lock); |
| 2335 | while (atomic_read(&fs_info->scrub_pause_req)) { |
| 2336 | mutex_unlock(&fs_info->scrub_lock); |
| 2337 | wait_event(fs_info->scrub_pause_wait, |
| 2338 | atomic_read(&fs_info->scrub_pause_req) == 0); |
| 2339 | mutex_lock(&fs_info->scrub_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2340 | } |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2341 | atomic_dec(&fs_info->scrubs_paused); |
| 2342 | mutex_unlock(&fs_info->scrub_lock); |
| 2343 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2344 | |
| 2345 | /* |
| 2346 | * collect all data csums for the stripe to avoid seeking during |
| 2347 | * the scrub. This might currently (crc32) end up to be about 1MB |
| 2348 | */ |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 2349 | blk_start_plug(&plug); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2350 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2351 | /* |
| 2352 | * now find all extents for each stripe and scrub them |
| 2353 | */ |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2354 | logical = base + offset; |
| 2355 | physical = map->stripes[num].physical; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2356 | ret = 0; |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2357 | for (i = 0; i < nstripes; ++i) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2358 | /* |
| 2359 | * canceled? |
| 2360 | */ |
| 2361 | if (atomic_read(&fs_info->scrub_cancel_req) || |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2362 | atomic_read(&sctx->cancel_req)) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2363 | ret = -ECANCELED; |
| 2364 | goto out; |
| 2365 | } |
| 2366 | /* |
| 2367 | * check to see if we have to pause |
| 2368 | */ |
| 2369 | if (atomic_read(&fs_info->scrub_pause_req)) { |
| 2370 | /* push queued extents */ |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2371 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2372 | scrub_submit(sctx); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2373 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 2374 | scrub_wr_submit(sctx); |
| 2375 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2376 | wait_event(sctx->list_wait, |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 2377 | atomic_read(&sctx->bios_in_flight) == 0); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2378 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2379 | atomic_inc(&fs_info->scrubs_paused); |
| 2380 | wake_up(&fs_info->scrub_pause_wait); |
| 2381 | mutex_lock(&fs_info->scrub_lock); |
| 2382 | while (atomic_read(&fs_info->scrub_pause_req)) { |
| 2383 | mutex_unlock(&fs_info->scrub_lock); |
| 2384 | wait_event(fs_info->scrub_pause_wait, |
| 2385 | atomic_read(&fs_info->scrub_pause_req) == 0); |
| 2386 | mutex_lock(&fs_info->scrub_lock); |
| 2387 | } |
| 2388 | atomic_dec(&fs_info->scrubs_paused); |
| 2389 | mutex_unlock(&fs_info->scrub_lock); |
| 2390 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2391 | } |
| 2392 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2393 | ret = btrfs_lookup_csums_range(csum_root, logical, |
| 2394 | logical + map->stripe_len - 1, |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2395 | &sctx->csum_list, 1); |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 2396 | if (ret) |
| 2397 | goto out; |
| 2398 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2399 | key.objectid = logical; |
| 2400 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 2401 | key.offset = (u64)0; |
| 2402 | |
| 2403 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 2404 | if (ret < 0) |
| 2405 | goto out; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2406 | if (ret > 0) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2407 | ret = btrfs_previous_item(root, path, 0, |
| 2408 | BTRFS_EXTENT_ITEM_KEY); |
| 2409 | if (ret < 0) |
| 2410 | goto out; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2411 | if (ret > 0) { |
| 2412 | /* there's no smaller item, so stick with the |
| 2413 | * larger one */ |
| 2414 | btrfs_release_path(path); |
| 2415 | ret = btrfs_search_slot(NULL, root, &key, |
| 2416 | path, 0, 0); |
| 2417 | if (ret < 0) |
| 2418 | goto out; |
| 2419 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2420 | } |
| 2421 | |
| 2422 | while (1) { |
| 2423 | l = path->nodes[0]; |
| 2424 | slot = path->slots[0]; |
| 2425 | if (slot >= btrfs_header_nritems(l)) { |
| 2426 | ret = btrfs_next_leaf(root, path); |
| 2427 | if (ret == 0) |
| 2428 | continue; |
| 2429 | if (ret < 0) |
| 2430 | goto out; |
| 2431 | |
| 2432 | break; |
| 2433 | } |
| 2434 | btrfs_item_key_to_cpu(l, &key, slot); |
| 2435 | |
| 2436 | if (key.objectid + key.offset <= logical) |
| 2437 | goto next; |
| 2438 | |
| 2439 | if (key.objectid >= logical + map->stripe_len) |
| 2440 | break; |
| 2441 | |
| 2442 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) |
| 2443 | goto next; |
| 2444 | |
| 2445 | extent = btrfs_item_ptr(l, slot, |
| 2446 | struct btrfs_extent_item); |
| 2447 | flags = btrfs_extent_flags(l, extent); |
| 2448 | generation = btrfs_extent_generation(l, extent); |
| 2449 | |
| 2450 | if (key.objectid < logical && |
| 2451 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { |
| 2452 | printk(KERN_ERR |
| 2453 | "btrfs scrub: tree block %llu spanning " |
| 2454 | "stripes, ignored. logical=%llu\n", |
| 2455 | (unsigned long long)key.objectid, |
| 2456 | (unsigned long long)logical); |
| 2457 | goto next; |
| 2458 | } |
| 2459 | |
| 2460 | /* |
| 2461 | * trim extent to this stripe |
| 2462 | */ |
| 2463 | if (key.objectid < logical) { |
| 2464 | key.offset -= logical - key.objectid; |
| 2465 | key.objectid = logical; |
| 2466 | } |
| 2467 | if (key.objectid + key.offset > |
| 2468 | logical + map->stripe_len) { |
| 2469 | key.offset = logical + map->stripe_len - |
| 2470 | key.objectid; |
| 2471 | } |
| 2472 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2473 | extent_logical = key.objectid; |
| 2474 | extent_physical = key.objectid - logical + physical; |
| 2475 | extent_len = key.offset; |
| 2476 | extent_dev = scrub_dev; |
| 2477 | extent_mirror_num = mirror_num; |
| 2478 | if (is_dev_replace) |
| 2479 | scrub_remap_extent(fs_info, extent_logical, |
| 2480 | extent_len, &extent_physical, |
| 2481 | &extent_dev, |
| 2482 | &extent_mirror_num); |
| 2483 | ret = scrub_extent(sctx, extent_logical, extent_len, |
| 2484 | extent_physical, extent_dev, flags, |
| 2485 | generation, extent_mirror_num, |
| 2486 | key.objectid - logical + physical); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2487 | if (ret) |
| 2488 | goto out; |
| 2489 | |
| 2490 | next: |
| 2491 | path->slots[0]++; |
| 2492 | } |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 2493 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2494 | logical += increment; |
| 2495 | physical += map->stripe_len; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2496 | spin_lock(&sctx->stat_lock); |
| 2497 | sctx->stat.last_physical = physical; |
| 2498 | spin_unlock(&sctx->stat_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2499 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2500 | out: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2501 | /* push queued extents */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2502 | scrub_submit(sctx); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2503 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 2504 | scrub_wr_submit(sctx); |
| 2505 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2506 | |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 2507 | blk_finish_plug(&plug); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2508 | btrfs_free_path(path); |
| 2509 | return ret < 0 ? ret : 0; |
| 2510 | } |
| 2511 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2512 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2513 | struct btrfs_device *scrub_dev, |
| 2514 | u64 chunk_tree, u64 chunk_objectid, |
| 2515 | u64 chunk_offset, u64 length, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2516 | u64 dev_offset, int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2517 | { |
| 2518 | struct btrfs_mapping_tree *map_tree = |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2519 | &sctx->dev_root->fs_info->mapping_tree; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2520 | struct map_lookup *map; |
| 2521 | struct extent_map *em; |
| 2522 | int i; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2523 | int ret = 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2524 | |
| 2525 | read_lock(&map_tree->map_tree.lock); |
| 2526 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
| 2527 | read_unlock(&map_tree->map_tree.lock); |
| 2528 | |
| 2529 | if (!em) |
| 2530 | return -EINVAL; |
| 2531 | |
| 2532 | map = (struct map_lookup *)em->bdev; |
| 2533 | if (em->start != chunk_offset) |
| 2534 | goto out; |
| 2535 | |
| 2536 | if (em->len < length) |
| 2537 | goto out; |
| 2538 | |
| 2539 | for (i = 0; i < map->num_stripes; ++i) { |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2540 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
Arne Jansen | 859acaf | 2012-02-09 15:09:02 +0100 | [diff] [blame] | 2541 | map->stripes[i].physical == dev_offset) { |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2542 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2543 | chunk_offset, length, |
| 2544 | is_dev_replace); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2545 | if (ret) |
| 2546 | goto out; |
| 2547 | } |
| 2548 | } |
| 2549 | out: |
| 2550 | free_extent_map(em); |
| 2551 | |
| 2552 | return ret; |
| 2553 | } |
| 2554 | |
| 2555 | static noinline_for_stack |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2556 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2557 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
| 2558 | int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2559 | { |
| 2560 | struct btrfs_dev_extent *dev_extent = NULL; |
| 2561 | struct btrfs_path *path; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2562 | struct btrfs_root *root = sctx->dev_root; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2563 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2564 | u64 length; |
| 2565 | u64 chunk_tree; |
| 2566 | u64 chunk_objectid; |
| 2567 | u64 chunk_offset; |
| 2568 | int ret; |
| 2569 | int slot; |
| 2570 | struct extent_buffer *l; |
| 2571 | struct btrfs_key key; |
| 2572 | struct btrfs_key found_key; |
| 2573 | struct btrfs_block_group_cache *cache; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2574 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2575 | |
| 2576 | path = btrfs_alloc_path(); |
| 2577 | if (!path) |
| 2578 | return -ENOMEM; |
| 2579 | |
| 2580 | path->reada = 2; |
| 2581 | path->search_commit_root = 1; |
| 2582 | path->skip_locking = 1; |
| 2583 | |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2584 | key.objectid = scrub_dev->devid; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2585 | key.offset = 0ull; |
| 2586 | key.type = BTRFS_DEV_EXTENT_KEY; |
| 2587 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2588 | while (1) { |
| 2589 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 2590 | if (ret < 0) |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2591 | break; |
| 2592 | if (ret > 0) { |
| 2593 | if (path->slots[0] >= |
| 2594 | btrfs_header_nritems(path->nodes[0])) { |
| 2595 | ret = btrfs_next_leaf(root, path); |
| 2596 | if (ret) |
| 2597 | break; |
| 2598 | } |
| 2599 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2600 | |
| 2601 | l = path->nodes[0]; |
| 2602 | slot = path->slots[0]; |
| 2603 | |
| 2604 | btrfs_item_key_to_cpu(l, &found_key, slot); |
| 2605 | |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2606 | if (found_key.objectid != scrub_dev->devid) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2607 | break; |
| 2608 | |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2609 | if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2610 | break; |
| 2611 | |
| 2612 | if (found_key.offset >= end) |
| 2613 | break; |
| 2614 | |
| 2615 | if (found_key.offset < key.offset) |
| 2616 | break; |
| 2617 | |
| 2618 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
| 2619 | length = btrfs_dev_extent_length(l, dev_extent); |
| 2620 | |
| 2621 | if (found_key.offset + length <= start) { |
| 2622 | key.offset = found_key.offset + length; |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 2623 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2624 | continue; |
| 2625 | } |
| 2626 | |
| 2627 | chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent); |
| 2628 | chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent); |
| 2629 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
| 2630 | |
| 2631 | /* |
| 2632 | * get a reference on the corresponding block group to prevent |
| 2633 | * the chunk from going away while we scrub it |
| 2634 | */ |
| 2635 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); |
| 2636 | if (!cache) { |
| 2637 | ret = -ENOENT; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2638 | break; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2639 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2640 | dev_replace->cursor_right = found_key.offset + length; |
| 2641 | dev_replace->cursor_left = found_key.offset; |
| 2642 | dev_replace->item_needs_writeback = 1; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2643 | ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2644 | chunk_offset, length, found_key.offset, |
| 2645 | is_dev_replace); |
| 2646 | |
| 2647 | /* |
| 2648 | * flush, submit all pending read and write bios, afterwards |
| 2649 | * wait for them. |
| 2650 | * Note that in the dev replace case, a read request causes |
| 2651 | * write requests that are submitted in the read completion |
| 2652 | * worker. Therefore in the current situation, it is required |
| 2653 | * that all write requests are flushed, so that all read and |
| 2654 | * write requests are really completed when bios_in_flight |
| 2655 | * changes to 0. |
| 2656 | */ |
| 2657 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
| 2658 | scrub_submit(sctx); |
| 2659 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 2660 | scrub_wr_submit(sctx); |
| 2661 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
| 2662 | |
| 2663 | wait_event(sctx->list_wait, |
| 2664 | atomic_read(&sctx->bios_in_flight) == 0); |
| 2665 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
| 2666 | atomic_inc(&fs_info->scrubs_paused); |
| 2667 | wake_up(&fs_info->scrub_pause_wait); |
| 2668 | wait_event(sctx->list_wait, |
| 2669 | atomic_read(&sctx->workers_pending) == 0); |
| 2670 | |
| 2671 | mutex_lock(&fs_info->scrub_lock); |
| 2672 | while (atomic_read(&fs_info->scrub_pause_req)) { |
| 2673 | mutex_unlock(&fs_info->scrub_lock); |
| 2674 | wait_event(fs_info->scrub_pause_wait, |
| 2675 | atomic_read(&fs_info->scrub_pause_req) == 0); |
| 2676 | mutex_lock(&fs_info->scrub_lock); |
| 2677 | } |
| 2678 | atomic_dec(&fs_info->scrubs_paused); |
| 2679 | mutex_unlock(&fs_info->scrub_lock); |
| 2680 | wake_up(&fs_info->scrub_pause_wait); |
| 2681 | |
| 2682 | dev_replace->cursor_left = dev_replace->cursor_right; |
| 2683 | dev_replace->item_needs_writeback = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2684 | btrfs_put_block_group(cache); |
| 2685 | if (ret) |
| 2686 | break; |
Stefan Behrens | af1be4f | 2012-11-27 17:39:51 +0000 | [diff] [blame] | 2687 | if (is_dev_replace && |
| 2688 | atomic64_read(&dev_replace->num_write_errors) > 0) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2689 | ret = -EIO; |
| 2690 | break; |
| 2691 | } |
| 2692 | if (sctx->stat.malloc_errors > 0) { |
| 2693 | ret = -ENOMEM; |
| 2694 | break; |
| 2695 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2696 | |
| 2697 | key.offset = found_key.offset + length; |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 2698 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2699 | } |
| 2700 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2701 | btrfs_free_path(path); |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 2702 | |
| 2703 | /* |
| 2704 | * ret can still be 1 from search_slot or next_leaf, |
| 2705 | * that's not an error |
| 2706 | */ |
| 2707 | return ret < 0 ? ret : 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2708 | } |
| 2709 | |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2710 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
| 2711 | struct btrfs_device *scrub_dev) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2712 | { |
| 2713 | int i; |
| 2714 | u64 bytenr; |
| 2715 | u64 gen; |
| 2716 | int ret; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2717 | struct btrfs_root *root = sctx->dev_root; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2718 | |
Miao Xie | 87533c4 | 2013-01-29 10:14:48 +0000 | [diff] [blame] | 2719 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2720 | return -EIO; |
| 2721 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2722 | gen = root->fs_info->last_trans_committed; |
| 2723 | |
| 2724 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| 2725 | bytenr = btrfs_sb_offset(i); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2726 | if (bytenr + BTRFS_SUPER_INFO_SIZE > scrub_dev->total_bytes) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2727 | break; |
| 2728 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2729 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2730 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2731 | NULL, 1, bytenr); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2732 | if (ret) |
| 2733 | return ret; |
| 2734 | } |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 2735 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2736 | |
| 2737 | return 0; |
| 2738 | } |
| 2739 | |
| 2740 | /* |
| 2741 | * get a reference count on fs_info->scrub_workers. start worker if necessary |
| 2742 | */ |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2743 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
| 2744 | int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2745 | { |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 2746 | int ret = 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2747 | |
| 2748 | mutex_lock(&fs_info->scrub_lock); |
Arne Jansen | 632dd77 | 2011-06-10 12:07:07 +0200 | [diff] [blame] | 2749 | if (fs_info->scrub_workers_refcnt == 0) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2750 | if (is_dev_replace) |
| 2751 | btrfs_init_workers(&fs_info->scrub_workers, "scrub", 1, |
| 2752 | &fs_info->generic_worker); |
| 2753 | else |
| 2754 | btrfs_init_workers(&fs_info->scrub_workers, "scrub", |
| 2755 | fs_info->thread_pool_size, |
| 2756 | &fs_info->generic_worker); |
Arne Jansen | 632dd77 | 2011-06-10 12:07:07 +0200 | [diff] [blame] | 2757 | fs_info->scrub_workers.idle_thresh = 4; |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 2758 | ret = btrfs_start_workers(&fs_info->scrub_workers); |
| 2759 | if (ret) |
| 2760 | goto out; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2761 | btrfs_init_workers(&fs_info->scrub_wr_completion_workers, |
| 2762 | "scrubwrc", |
| 2763 | fs_info->thread_pool_size, |
| 2764 | &fs_info->generic_worker); |
| 2765 | fs_info->scrub_wr_completion_workers.idle_thresh = 2; |
| 2766 | ret = btrfs_start_workers( |
| 2767 | &fs_info->scrub_wr_completion_workers); |
| 2768 | if (ret) |
| 2769 | goto out; |
| 2770 | btrfs_init_workers(&fs_info->scrub_nocow_workers, "scrubnc", 1, |
| 2771 | &fs_info->generic_worker); |
| 2772 | ret = btrfs_start_workers(&fs_info->scrub_nocow_workers); |
| 2773 | if (ret) |
| 2774 | goto out; |
Arne Jansen | 632dd77 | 2011-06-10 12:07:07 +0200 | [diff] [blame] | 2775 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2776 | ++fs_info->scrub_workers_refcnt; |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 2777 | out: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2778 | mutex_unlock(&fs_info->scrub_lock); |
| 2779 | |
Josef Bacik | 0dc3b84 | 2011-11-18 14:37:27 -0500 | [diff] [blame] | 2780 | return ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2781 | } |
| 2782 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2783 | static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2784 | { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2785 | mutex_lock(&fs_info->scrub_lock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2786 | if (--fs_info->scrub_workers_refcnt == 0) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2787 | btrfs_stop_workers(&fs_info->scrub_workers); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2788 | btrfs_stop_workers(&fs_info->scrub_wr_completion_workers); |
| 2789 | btrfs_stop_workers(&fs_info->scrub_nocow_workers); |
| 2790 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2791 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
| 2792 | mutex_unlock(&fs_info->scrub_lock); |
| 2793 | } |
| 2794 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2795 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
| 2796 | u64 end, struct btrfs_scrub_progress *progress, |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 2797 | int readonly, int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2798 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2799 | struct scrub_ctx *sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2800 | int ret; |
| 2801 | struct btrfs_device *dev; |
| 2802 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2803 | if (btrfs_fs_closing(fs_info)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2804 | return -EINVAL; |
| 2805 | |
| 2806 | /* |
| 2807 | * check some assumptions |
| 2808 | */ |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2809 | if (fs_info->chunk_root->nodesize != fs_info->chunk_root->leafsize) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2810 | printk(KERN_ERR |
| 2811 | "btrfs_scrub: size assumption nodesize == leafsize (%d == %d) fails\n", |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2812 | fs_info->chunk_root->nodesize, |
| 2813 | fs_info->chunk_root->leafsize); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2814 | return -EINVAL; |
| 2815 | } |
| 2816 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2817 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2818 | /* |
| 2819 | * in this case scrub is unable to calculate the checksum |
| 2820 | * the way scrub is implemented. Do not handle this |
| 2821 | * situation at all because it won't ever happen. |
| 2822 | */ |
| 2823 | printk(KERN_ERR |
| 2824 | "btrfs_scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails\n", |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2825 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2826 | return -EINVAL; |
| 2827 | } |
| 2828 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2829 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2830 | /* not supported for data w/o checksums */ |
| 2831 | printk(KERN_ERR |
| 2832 | "btrfs_scrub: size assumption sectorsize != PAGE_SIZE (%d != %lld) fails\n", |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2833 | fs_info->chunk_root->sectorsize, |
| 2834 | (unsigned long long)PAGE_SIZE); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2835 | return -EINVAL; |
| 2836 | } |
| 2837 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2838 | if (fs_info->chunk_root->nodesize > |
| 2839 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || |
| 2840 | fs_info->chunk_root->sectorsize > |
| 2841 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { |
| 2842 | /* |
| 2843 | * would exhaust the array bounds of pagev member in |
| 2844 | * struct scrub_block |
| 2845 | */ |
| 2846 | pr_err("btrfs_scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails\n", |
| 2847 | fs_info->chunk_root->nodesize, |
| 2848 | SCRUB_MAX_PAGES_PER_BLOCK, |
| 2849 | fs_info->chunk_root->sectorsize, |
| 2850 | SCRUB_MAX_PAGES_PER_BLOCK); |
| 2851 | return -EINVAL; |
| 2852 | } |
| 2853 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2854 | ret = scrub_workers_get(fs_info, is_dev_replace); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2855 | if (ret) |
| 2856 | return ret; |
| 2857 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2858 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
| 2859 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 2860 | if (!dev || (dev->missing && !is_dev_replace)) { |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2861 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 2862 | scrub_workers_put(fs_info); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2863 | return -ENODEV; |
| 2864 | } |
| 2865 | mutex_lock(&fs_info->scrub_lock); |
| 2866 | |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 2867 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2868 | mutex_unlock(&fs_info->scrub_lock); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2869 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 2870 | scrub_workers_put(fs_info); |
| 2871 | return -EIO; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2872 | } |
| 2873 | |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 2874 | btrfs_dev_replace_lock(&fs_info->dev_replace); |
| 2875 | if (dev->scrub_device || |
| 2876 | (!is_dev_replace && |
| 2877 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { |
| 2878 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2879 | mutex_unlock(&fs_info->scrub_lock); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2880 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 2881 | scrub_workers_put(fs_info); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2882 | return -EINPROGRESS; |
| 2883 | } |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 2884 | btrfs_dev_replace_unlock(&fs_info->dev_replace); |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 2885 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2886 | if (IS_ERR(sctx)) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2887 | mutex_unlock(&fs_info->scrub_lock); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2888 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 2889 | scrub_workers_put(fs_info); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2890 | return PTR_ERR(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2891 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2892 | sctx->readonly = readonly; |
| 2893 | dev->scrub_device = sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2894 | |
| 2895 | atomic_inc(&fs_info->scrubs_running); |
| 2896 | mutex_unlock(&fs_info->scrub_lock); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2897 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2898 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2899 | if (!is_dev_replace) { |
| 2900 | down_read(&fs_info->scrub_super_lock); |
| 2901 | ret = scrub_supers(sctx, dev); |
| 2902 | up_read(&fs_info->scrub_super_lock); |
| 2903 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2904 | |
| 2905 | if (!ret) |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2906 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
| 2907 | is_dev_replace); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2908 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 2909 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2910 | atomic_dec(&fs_info->scrubs_running); |
| 2911 | wake_up(&fs_info->scrub_pause_wait); |
| 2912 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 2913 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 2914 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2915 | if (progress) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2916 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2917 | |
| 2918 | mutex_lock(&fs_info->scrub_lock); |
| 2919 | dev->scrub_device = NULL; |
| 2920 | mutex_unlock(&fs_info->scrub_lock); |
| 2921 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2922 | scrub_free_ctx(sctx); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2923 | scrub_workers_put(fs_info); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2924 | |
| 2925 | return ret; |
| 2926 | } |
| 2927 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 2928 | void btrfs_scrub_pause(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2929 | { |
| 2930 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2931 | |
| 2932 | mutex_lock(&fs_info->scrub_lock); |
| 2933 | atomic_inc(&fs_info->scrub_pause_req); |
| 2934 | while (atomic_read(&fs_info->scrubs_paused) != |
| 2935 | atomic_read(&fs_info->scrubs_running)) { |
| 2936 | mutex_unlock(&fs_info->scrub_lock); |
| 2937 | wait_event(fs_info->scrub_pause_wait, |
| 2938 | atomic_read(&fs_info->scrubs_paused) == |
| 2939 | atomic_read(&fs_info->scrubs_running)); |
| 2940 | mutex_lock(&fs_info->scrub_lock); |
| 2941 | } |
| 2942 | mutex_unlock(&fs_info->scrub_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2943 | } |
| 2944 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 2945 | void btrfs_scrub_continue(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2946 | { |
| 2947 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2948 | |
| 2949 | atomic_dec(&fs_info->scrub_pause_req); |
| 2950 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2951 | } |
| 2952 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 2953 | void btrfs_scrub_pause_super(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2954 | { |
| 2955 | down_write(&root->fs_info->scrub_super_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2956 | } |
| 2957 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 2958 | void btrfs_scrub_continue_super(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2959 | { |
| 2960 | up_write(&root->fs_info->scrub_super_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2961 | } |
| 2962 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2963 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2964 | { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2965 | mutex_lock(&fs_info->scrub_lock); |
| 2966 | if (!atomic_read(&fs_info->scrubs_running)) { |
| 2967 | mutex_unlock(&fs_info->scrub_lock); |
| 2968 | return -ENOTCONN; |
| 2969 | } |
| 2970 | |
| 2971 | atomic_inc(&fs_info->scrub_cancel_req); |
| 2972 | while (atomic_read(&fs_info->scrubs_running)) { |
| 2973 | mutex_unlock(&fs_info->scrub_lock); |
| 2974 | wait_event(fs_info->scrub_pause_wait, |
| 2975 | atomic_read(&fs_info->scrubs_running) == 0); |
| 2976 | mutex_lock(&fs_info->scrub_lock); |
| 2977 | } |
| 2978 | atomic_dec(&fs_info->scrub_cancel_req); |
| 2979 | mutex_unlock(&fs_info->scrub_lock); |
| 2980 | |
| 2981 | return 0; |
| 2982 | } |
| 2983 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2984 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
| 2985 | struct btrfs_device *dev) |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2986 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2987 | struct scrub_ctx *sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2988 | |
| 2989 | mutex_lock(&fs_info->scrub_lock); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2990 | sctx = dev->scrub_device; |
| 2991 | if (!sctx) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2992 | mutex_unlock(&fs_info->scrub_lock); |
| 2993 | return -ENOTCONN; |
| 2994 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2995 | atomic_inc(&sctx->cancel_req); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2996 | while (dev->scrub_device) { |
| 2997 | mutex_unlock(&fs_info->scrub_lock); |
| 2998 | wait_event(fs_info->scrub_pause_wait, |
| 2999 | dev->scrub_device == NULL); |
| 3000 | mutex_lock(&fs_info->scrub_lock); |
| 3001 | } |
| 3002 | mutex_unlock(&fs_info->scrub_lock); |
| 3003 | |
| 3004 | return 0; |
| 3005 | } |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 3006 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3007 | int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid) |
| 3008 | { |
| 3009 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 3010 | struct btrfs_device *dev; |
| 3011 | int ret; |
| 3012 | |
| 3013 | /* |
| 3014 | * we have to hold the device_list_mutex here so the device |
| 3015 | * does not go away in cancel_dev. FIXME: find a better solution |
| 3016 | */ |
| 3017 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3018 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3019 | if (!dev) { |
| 3020 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 3021 | return -ENODEV; |
| 3022 | } |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3023 | ret = btrfs_scrub_cancel_dev(fs_info, dev); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3024 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 3025 | |
| 3026 | return ret; |
| 3027 | } |
| 3028 | |
| 3029 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
| 3030 | struct btrfs_scrub_progress *progress) |
| 3031 | { |
| 3032 | struct btrfs_device *dev; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3033 | struct scrub_ctx *sctx = NULL; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3034 | |
| 3035 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3036 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3037 | if (dev) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3038 | sctx = dev->scrub_device; |
| 3039 | if (sctx) |
| 3040 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3041 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 3042 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3043 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3044 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3045 | |
| 3046 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
| 3047 | u64 extent_logical, u64 extent_len, |
| 3048 | u64 *extent_physical, |
| 3049 | struct btrfs_device **extent_dev, |
| 3050 | int *extent_mirror_num) |
| 3051 | { |
| 3052 | u64 mapped_length; |
| 3053 | struct btrfs_bio *bbio = NULL; |
| 3054 | int ret; |
| 3055 | |
| 3056 | mapped_length = extent_len; |
| 3057 | ret = btrfs_map_block(fs_info, READ, extent_logical, |
| 3058 | &mapped_length, &bbio, 0); |
| 3059 | if (ret || !bbio || mapped_length < extent_len || |
| 3060 | !bbio->stripes[0].dev->bdev) { |
| 3061 | kfree(bbio); |
| 3062 | return; |
| 3063 | } |
| 3064 | |
| 3065 | *extent_physical = bbio->stripes[0].physical; |
| 3066 | *extent_mirror_num = bbio->mirror_num; |
| 3067 | *extent_dev = bbio->stripes[0].dev; |
| 3068 | kfree(bbio); |
| 3069 | } |
| 3070 | |
| 3071 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, |
| 3072 | struct scrub_wr_ctx *wr_ctx, |
| 3073 | struct btrfs_fs_info *fs_info, |
| 3074 | struct btrfs_device *dev, |
| 3075 | int is_dev_replace) |
| 3076 | { |
| 3077 | WARN_ON(wr_ctx->wr_curr_bio != NULL); |
| 3078 | |
| 3079 | mutex_init(&wr_ctx->wr_lock); |
| 3080 | wr_ctx->wr_curr_bio = NULL; |
| 3081 | if (!is_dev_replace) |
| 3082 | return 0; |
| 3083 | |
| 3084 | WARN_ON(!dev->bdev); |
| 3085 | wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO, |
| 3086 | bio_get_nr_vecs(dev->bdev)); |
| 3087 | wr_ctx->tgtdev = dev; |
| 3088 | atomic_set(&wr_ctx->flush_all_writes, 0); |
| 3089 | return 0; |
| 3090 | } |
| 3091 | |
| 3092 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) |
| 3093 | { |
| 3094 | mutex_lock(&wr_ctx->wr_lock); |
| 3095 | kfree(wr_ctx->wr_curr_bio); |
| 3096 | wr_ctx->wr_curr_bio = NULL; |
| 3097 | mutex_unlock(&wr_ctx->wr_lock); |
| 3098 | } |
| 3099 | |
| 3100 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
| 3101 | int mirror_num, u64 physical_for_dev_replace) |
| 3102 | { |
| 3103 | struct scrub_copy_nocow_ctx *nocow_ctx; |
| 3104 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
| 3105 | |
| 3106 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); |
| 3107 | if (!nocow_ctx) { |
| 3108 | spin_lock(&sctx->stat_lock); |
| 3109 | sctx->stat.malloc_errors++; |
| 3110 | spin_unlock(&sctx->stat_lock); |
| 3111 | return -ENOMEM; |
| 3112 | } |
| 3113 | |
| 3114 | scrub_pending_trans_workers_inc(sctx); |
| 3115 | |
| 3116 | nocow_ctx->sctx = sctx; |
| 3117 | nocow_ctx->logical = logical; |
| 3118 | nocow_ctx->len = len; |
| 3119 | nocow_ctx->mirror_num = mirror_num; |
| 3120 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; |
| 3121 | nocow_ctx->work.func = copy_nocow_pages_worker; |
| 3122 | btrfs_queue_worker(&fs_info->scrub_nocow_workers, |
| 3123 | &nocow_ctx->work); |
| 3124 | |
| 3125 | return 0; |
| 3126 | } |
| 3127 | |
| 3128 | static void copy_nocow_pages_worker(struct btrfs_work *work) |
| 3129 | { |
| 3130 | struct scrub_copy_nocow_ctx *nocow_ctx = |
| 3131 | container_of(work, struct scrub_copy_nocow_ctx, work); |
| 3132 | struct scrub_ctx *sctx = nocow_ctx->sctx; |
| 3133 | u64 logical = nocow_ctx->logical; |
| 3134 | u64 len = nocow_ctx->len; |
| 3135 | int mirror_num = nocow_ctx->mirror_num; |
| 3136 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
| 3137 | int ret; |
| 3138 | struct btrfs_trans_handle *trans = NULL; |
| 3139 | struct btrfs_fs_info *fs_info; |
| 3140 | struct btrfs_path *path; |
| 3141 | struct btrfs_root *root; |
| 3142 | int not_written = 0; |
| 3143 | |
| 3144 | fs_info = sctx->dev_root->fs_info; |
| 3145 | root = fs_info->extent_root; |
| 3146 | |
| 3147 | path = btrfs_alloc_path(); |
| 3148 | if (!path) { |
| 3149 | spin_lock(&sctx->stat_lock); |
| 3150 | sctx->stat.malloc_errors++; |
| 3151 | spin_unlock(&sctx->stat_lock); |
| 3152 | not_written = 1; |
| 3153 | goto out; |
| 3154 | } |
| 3155 | |
| 3156 | trans = btrfs_join_transaction(root); |
| 3157 | if (IS_ERR(trans)) { |
| 3158 | not_written = 1; |
| 3159 | goto out; |
| 3160 | } |
| 3161 | |
| 3162 | ret = iterate_inodes_from_logical(logical, fs_info, path, |
| 3163 | copy_nocow_pages_for_inode, |
| 3164 | nocow_ctx); |
| 3165 | if (ret != 0 && ret != -ENOENT) { |
| 3166 | pr_warn("iterate_inodes_from_logical() failed: log %llu, phys %llu, len %llu, mir %llu, ret %d\n", |
| 3167 | (unsigned long long)logical, |
| 3168 | (unsigned long long)physical_for_dev_replace, |
| 3169 | (unsigned long long)len, |
| 3170 | (unsigned long long)mirror_num, ret); |
| 3171 | not_written = 1; |
| 3172 | goto out; |
| 3173 | } |
| 3174 | |
| 3175 | out: |
| 3176 | if (trans && !IS_ERR(trans)) |
| 3177 | btrfs_end_transaction(trans, root); |
| 3178 | if (not_written) |
| 3179 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. |
| 3180 | num_uncorrectable_read_errors); |
| 3181 | |
| 3182 | btrfs_free_path(path); |
| 3183 | kfree(nocow_ctx); |
| 3184 | |
| 3185 | scrub_pending_trans_workers_dec(sctx); |
| 3186 | } |
| 3187 | |
| 3188 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, void *ctx) |
| 3189 | { |
| 3190 | unsigned long index; |
| 3191 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; |
| 3192 | int ret = 0; |
| 3193 | struct btrfs_key key; |
| 3194 | struct inode *inode = NULL; |
| 3195 | struct btrfs_root *local_root; |
| 3196 | u64 physical_for_dev_replace; |
| 3197 | u64 len; |
| 3198 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 3199 | int srcu_index; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3200 | |
| 3201 | key.objectid = root; |
| 3202 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 3203 | key.offset = (u64)-1; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 3204 | |
| 3205 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); |
| 3206 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3207 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 3208 | if (IS_ERR(local_root)) { |
| 3209 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3210 | return PTR_ERR(local_root); |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 3211 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3212 | |
| 3213 | key.type = BTRFS_INODE_ITEM_KEY; |
| 3214 | key.objectid = inum; |
| 3215 | key.offset = 0; |
| 3216 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 3217 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3218 | if (IS_ERR(inode)) |
| 3219 | return PTR_ERR(inode); |
| 3220 | |
| 3221 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
| 3222 | len = nocow_ctx->len; |
| 3223 | while (len >= PAGE_CACHE_SIZE) { |
| 3224 | struct page *page = NULL; |
| 3225 | int ret_sub; |
| 3226 | |
| 3227 | index = offset >> PAGE_CACHE_SHIFT; |
| 3228 | |
| 3229 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
| 3230 | if (!page) { |
| 3231 | pr_err("find_or_create_page() failed\n"); |
| 3232 | ret = -ENOMEM; |
| 3233 | goto next_page; |
| 3234 | } |
| 3235 | |
| 3236 | if (PageUptodate(page)) { |
| 3237 | if (PageDirty(page)) |
| 3238 | goto next_page; |
| 3239 | } else { |
| 3240 | ClearPageError(page); |
| 3241 | ret_sub = extent_read_full_page(&BTRFS_I(inode)-> |
| 3242 | io_tree, |
| 3243 | page, btrfs_get_extent, |
| 3244 | nocow_ctx->mirror_num); |
| 3245 | if (ret_sub) { |
| 3246 | ret = ret_sub; |
| 3247 | goto next_page; |
| 3248 | } |
| 3249 | wait_on_page_locked(page); |
| 3250 | if (!PageUptodate(page)) { |
| 3251 | ret = -EIO; |
| 3252 | goto next_page; |
| 3253 | } |
| 3254 | } |
| 3255 | ret_sub = write_page_nocow(nocow_ctx->sctx, |
| 3256 | physical_for_dev_replace, page); |
| 3257 | if (ret_sub) { |
| 3258 | ret = ret_sub; |
| 3259 | goto next_page; |
| 3260 | } |
| 3261 | |
| 3262 | next_page: |
| 3263 | if (page) { |
| 3264 | unlock_page(page); |
| 3265 | put_page(page); |
| 3266 | } |
| 3267 | offset += PAGE_CACHE_SIZE; |
| 3268 | physical_for_dev_replace += PAGE_CACHE_SIZE; |
| 3269 | len -= PAGE_CACHE_SIZE; |
| 3270 | } |
| 3271 | |
| 3272 | if (inode) |
| 3273 | iput(inode); |
| 3274 | return ret; |
| 3275 | } |
| 3276 | |
| 3277 | static int write_page_nocow(struct scrub_ctx *sctx, |
| 3278 | u64 physical_for_dev_replace, struct page *page) |
| 3279 | { |
| 3280 | struct bio *bio; |
| 3281 | struct btrfs_device *dev; |
| 3282 | int ret; |
| 3283 | DECLARE_COMPLETION_ONSTACK(compl); |
| 3284 | |
| 3285 | dev = sctx->wr_ctx.tgtdev; |
| 3286 | if (!dev) |
| 3287 | return -EIO; |
| 3288 | if (!dev->bdev) { |
| 3289 | printk_ratelimited(KERN_WARNING |
| 3290 | "btrfs: scrub write_page_nocow(bdev == NULL) is unexpected!\n"); |
| 3291 | return -EIO; |
| 3292 | } |
| 3293 | bio = bio_alloc(GFP_NOFS, 1); |
| 3294 | if (!bio) { |
| 3295 | spin_lock(&sctx->stat_lock); |
| 3296 | sctx->stat.malloc_errors++; |
| 3297 | spin_unlock(&sctx->stat_lock); |
| 3298 | return -ENOMEM; |
| 3299 | } |
| 3300 | bio->bi_private = &compl; |
| 3301 | bio->bi_end_io = scrub_complete_bio_end_io; |
| 3302 | bio->bi_size = 0; |
| 3303 | bio->bi_sector = physical_for_dev_replace >> 9; |
| 3304 | bio->bi_bdev = dev->bdev; |
| 3305 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); |
| 3306 | if (ret != PAGE_CACHE_SIZE) { |
| 3307 | leave_with_eio: |
| 3308 | bio_put(bio); |
| 3309 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
| 3310 | return -EIO; |
| 3311 | } |
| 3312 | btrfsic_submit_bio(WRITE_SYNC, bio); |
| 3313 | wait_for_completion(&compl); |
| 3314 | |
| 3315 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) |
| 3316 | goto leave_with_eio; |
| 3317 | |
| 3318 | bio_put(bio); |
| 3319 | return 0; |
| 3320 | } |