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 | |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 66 | struct scrub_recover { |
| 67 | atomic_t refs; |
| 68 | struct btrfs_bio *bbio; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 69 | u64 map_length; |
| 70 | }; |
| 71 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 72 | struct scrub_page { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 73 | struct scrub_block *sblock; |
| 74 | struct page *page; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 75 | struct btrfs_device *dev; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 76 | struct list_head list; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 77 | u64 flags; /* extent flags */ |
| 78 | u64 generation; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 79 | u64 logical; |
| 80 | u64 physical; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 81 | u64 physical_for_dev_replace; |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 82 | atomic_t refs; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 83 | struct { |
| 84 | unsigned int mirror_num:8; |
| 85 | unsigned int have_csum:1; |
| 86 | unsigned int io_error:1; |
| 87 | }; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 88 | u8 csum[BTRFS_CSUM_SIZE]; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 89 | |
| 90 | struct scrub_recover *recover; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 91 | }; |
| 92 | |
| 93 | struct scrub_bio { |
| 94 | int index; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 95 | struct scrub_ctx *sctx; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 96 | struct btrfs_device *dev; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 97 | struct bio *bio; |
| 98 | int err; |
| 99 | u64 logical; |
| 100 | u64 physical; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 101 | #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO |
| 102 | struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO]; |
| 103 | #else |
| 104 | struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO]; |
| 105 | #endif |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 106 | int page_count; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 107 | int next_free; |
| 108 | struct btrfs_work work; |
| 109 | }; |
| 110 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 111 | struct scrub_block { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 112 | struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 113 | int page_count; |
| 114 | atomic_t outstanding_pages; |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 115 | atomic_t refs; /* free mem on transition to zero */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 116 | struct scrub_ctx *sctx; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 117 | struct scrub_parity *sparity; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 118 | struct { |
| 119 | unsigned int header_error:1; |
| 120 | unsigned int checksum_error:1; |
| 121 | unsigned int no_io_error_seen:1; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 122 | unsigned int generation_error:1; /* also sets header_error */ |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 123 | |
| 124 | /* The following is for the data used to check parity */ |
| 125 | /* It is for the data with checksum */ |
| 126 | unsigned int data_corrected:1; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 127 | }; |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 128 | struct btrfs_work work; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 129 | }; |
| 130 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 131 | /* Used for the chunks with parity stripe such RAID5/6 */ |
| 132 | struct scrub_parity { |
| 133 | struct scrub_ctx *sctx; |
| 134 | |
| 135 | struct btrfs_device *scrub_dev; |
| 136 | |
| 137 | u64 logic_start; |
| 138 | |
| 139 | u64 logic_end; |
| 140 | |
| 141 | int nsectors; |
| 142 | |
| 143 | int stripe_len; |
| 144 | |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 145 | atomic_t refs; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 146 | |
| 147 | struct list_head spages; |
| 148 | |
| 149 | /* Work of parity check and repair */ |
| 150 | struct btrfs_work work; |
| 151 | |
| 152 | /* Mark the parity blocks which have data */ |
| 153 | unsigned long *dbitmap; |
| 154 | |
| 155 | /* |
| 156 | * Mark the parity blocks which have data, but errors happen when |
| 157 | * read data or check data |
| 158 | */ |
| 159 | unsigned long *ebitmap; |
| 160 | |
| 161 | unsigned long bitmap[0]; |
| 162 | }; |
| 163 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 164 | struct scrub_wr_ctx { |
| 165 | struct scrub_bio *wr_curr_bio; |
| 166 | struct btrfs_device *tgtdev; |
| 167 | int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */ |
| 168 | atomic_t flush_all_writes; |
| 169 | struct mutex wr_lock; |
| 170 | }; |
| 171 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 172 | struct scrub_ctx { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 173 | struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX]; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 174 | struct btrfs_root *dev_root; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 175 | int first_free; |
| 176 | int curr; |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 177 | atomic_t bios_in_flight; |
| 178 | atomic_t workers_pending; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 179 | spinlock_t list_lock; |
| 180 | wait_queue_head_t list_wait; |
| 181 | u16 csum_size; |
| 182 | struct list_head csum_list; |
| 183 | atomic_t cancel_req; |
Arne Jansen | 8628764 | 2011-03-23 16:34:19 +0100 | [diff] [blame] | 184 | int readonly; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 185 | int pages_per_rd_bio; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 186 | u32 sectorsize; |
| 187 | u32 nodesize; |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 188 | |
| 189 | int is_dev_replace; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 190 | struct scrub_wr_ctx wr_ctx; |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 191 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 192 | /* |
| 193 | * statistics |
| 194 | */ |
| 195 | struct btrfs_scrub_progress stat; |
| 196 | spinlock_t stat_lock; |
Filipe Manana | f55985f | 2015-02-09 21:14:24 +0000 | [diff] [blame] | 197 | |
| 198 | /* |
| 199 | * Use a ref counter to avoid use-after-free issues. Scrub workers |
| 200 | * decrement bios_in_flight and workers_pending and then do a wakeup |
| 201 | * on the list_wait wait queue. We must ensure the main scrub task |
| 202 | * doesn't free the scrub context before or while the workers are |
| 203 | * doing the wakeup() call. |
| 204 | */ |
| 205 | atomic_t refs; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 206 | }; |
| 207 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 208 | struct scrub_fixup_nodatasum { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 209 | struct scrub_ctx *sctx; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 210 | struct btrfs_device *dev; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 211 | u64 logical; |
| 212 | struct btrfs_root *root; |
| 213 | struct btrfs_work work; |
| 214 | int mirror_num; |
| 215 | }; |
| 216 | |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 217 | struct scrub_nocow_inode { |
| 218 | u64 inum; |
| 219 | u64 offset; |
| 220 | u64 root; |
| 221 | struct list_head list; |
| 222 | }; |
| 223 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 224 | struct scrub_copy_nocow_ctx { |
| 225 | struct scrub_ctx *sctx; |
| 226 | u64 logical; |
| 227 | u64 len; |
| 228 | int mirror_num; |
| 229 | u64 physical_for_dev_replace; |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 230 | struct list_head inodes; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 231 | struct btrfs_work work; |
| 232 | }; |
| 233 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 234 | struct scrub_warning { |
| 235 | struct btrfs_path *path; |
| 236 | u64 extent_item_size; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 237 | const char *errstr; |
| 238 | sector_t sector; |
| 239 | u64 logical; |
| 240 | struct btrfs_device *dev; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 241 | }; |
| 242 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 243 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx); |
| 244 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx); |
| 245 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx); |
| 246 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 247 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check); |
Zhao Lei | be50a8d | 2015-01-20 15:11:42 +0800 | [diff] [blame] | 248 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 249 | struct scrub_block *sblocks_for_recheck); |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 250 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
Zhao Lei | affe4a5 | 2015-08-24 21:32:06 +0800 | [diff] [blame] | 251 | struct scrub_block *sblock, |
| 252 | int retry_failed_mirror); |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 253 | static void scrub_recheck_block_checksum(struct scrub_block *sblock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 254 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
Zhao Lei | 114ab50 | 2015-01-20 15:11:36 +0800 | [diff] [blame] | 255 | struct scrub_block *sblock_good); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 256 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
| 257 | struct scrub_block *sblock_good, |
| 258 | int page_num, int force_write); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 259 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock); |
| 260 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, |
| 261 | int page_num); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 262 | static int scrub_checksum_data(struct scrub_block *sblock); |
| 263 | static int scrub_checksum_tree_block(struct scrub_block *sblock); |
| 264 | static int scrub_checksum_super(struct scrub_block *sblock); |
| 265 | static void scrub_block_get(struct scrub_block *sblock); |
| 266 | static void scrub_block_put(struct scrub_block *sblock); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 267 | static void scrub_page_get(struct scrub_page *spage); |
| 268 | static void scrub_page_put(struct scrub_page *spage); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 269 | static void scrub_parity_get(struct scrub_parity *sparity); |
| 270 | static void scrub_parity_put(struct scrub_parity *sparity); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 271 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
| 272 | struct scrub_page *spage); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 273 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 274 | u64 physical, struct btrfs_device *dev, u64 flags, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 275 | u64 gen, int mirror_num, u8 *csum, int force, |
| 276 | u64 physical_for_dev_replace); |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 277 | static void scrub_bio_end_io(struct bio *bio); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 278 | static void scrub_bio_end_io_worker(struct btrfs_work *work); |
| 279 | static void scrub_block_complete(struct scrub_block *sblock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 280 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
| 281 | u64 extent_logical, u64 extent_len, |
| 282 | u64 *extent_physical, |
| 283 | struct btrfs_device **extent_dev, |
| 284 | int *extent_mirror_num); |
| 285 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, |
| 286 | struct scrub_wr_ctx *wr_ctx, |
| 287 | struct btrfs_fs_info *fs_info, |
| 288 | struct btrfs_device *dev, |
| 289 | int is_dev_replace); |
| 290 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx); |
| 291 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, |
| 292 | struct scrub_page *spage); |
| 293 | static void scrub_wr_submit(struct scrub_ctx *sctx); |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 294 | static void scrub_wr_bio_end_io(struct bio *bio); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 295 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work); |
| 296 | static int write_page_nocow(struct scrub_ctx *sctx, |
| 297 | u64 physical_for_dev_replace, struct page *page); |
| 298 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 299 | struct scrub_copy_nocow_ctx *ctx); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 300 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
| 301 | int mirror_num, u64 physical_for_dev_replace); |
| 302 | static void copy_nocow_pages_worker(struct btrfs_work *work); |
Wang Shilong | cb7ab02 | 2013-12-04 21:16:53 +0800 | [diff] [blame] | 303 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
Wang Shilong | 3cb0929 | 2013-12-04 21:15:19 +0800 | [diff] [blame] | 304 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info); |
Filipe Manana | f55985f | 2015-02-09 21:14:24 +0000 | [diff] [blame] | 305 | static void scrub_put_ctx(struct scrub_ctx *sctx); |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 306 | |
| 307 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 308 | static void scrub_pending_bio_inc(struct scrub_ctx *sctx) |
| 309 | { |
Filipe Manana | f55985f | 2015-02-09 21:14:24 +0000 | [diff] [blame] | 310 | atomic_inc(&sctx->refs); |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 311 | atomic_inc(&sctx->bios_in_flight); |
| 312 | } |
| 313 | |
| 314 | static void scrub_pending_bio_dec(struct scrub_ctx *sctx) |
| 315 | { |
| 316 | atomic_dec(&sctx->bios_in_flight); |
| 317 | wake_up(&sctx->list_wait); |
Filipe Manana | f55985f | 2015-02-09 21:14:24 +0000 | [diff] [blame] | 318 | scrub_put_ctx(sctx); |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 319 | } |
| 320 | |
Wang Shilong | cb7ab02 | 2013-12-04 21:16:53 +0800 | [diff] [blame] | 321 | static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
Wang Shilong | 3cb0929 | 2013-12-04 21:15:19 +0800 | [diff] [blame] | 322 | { |
| 323 | while (atomic_read(&fs_info->scrub_pause_req)) { |
| 324 | mutex_unlock(&fs_info->scrub_lock); |
| 325 | wait_event(fs_info->scrub_pause_wait, |
| 326 | atomic_read(&fs_info->scrub_pause_req) == 0); |
| 327 | mutex_lock(&fs_info->scrub_lock); |
| 328 | } |
| 329 | } |
| 330 | |
Zhaolei | 0e22be8 | 2015-08-05 16:43:28 +0800 | [diff] [blame] | 331 | static void scrub_pause_on(struct btrfs_fs_info *fs_info) |
Wang Shilong | cb7ab02 | 2013-12-04 21:16:53 +0800 | [diff] [blame] | 332 | { |
| 333 | atomic_inc(&fs_info->scrubs_paused); |
| 334 | wake_up(&fs_info->scrub_pause_wait); |
Zhaolei | 0e22be8 | 2015-08-05 16:43:28 +0800 | [diff] [blame] | 335 | } |
Wang Shilong | cb7ab02 | 2013-12-04 21:16:53 +0800 | [diff] [blame] | 336 | |
Zhaolei | 0e22be8 | 2015-08-05 16:43:28 +0800 | [diff] [blame] | 337 | static void scrub_pause_off(struct btrfs_fs_info *fs_info) |
| 338 | { |
Wang Shilong | cb7ab02 | 2013-12-04 21:16:53 +0800 | [diff] [blame] | 339 | mutex_lock(&fs_info->scrub_lock); |
| 340 | __scrub_blocked_if_needed(fs_info); |
| 341 | atomic_dec(&fs_info->scrubs_paused); |
| 342 | mutex_unlock(&fs_info->scrub_lock); |
| 343 | |
| 344 | wake_up(&fs_info->scrub_pause_wait); |
| 345 | } |
| 346 | |
Zhaolei | 0e22be8 | 2015-08-05 16:43:28 +0800 | [diff] [blame] | 347 | static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info) |
| 348 | { |
| 349 | scrub_pause_on(fs_info); |
| 350 | scrub_pause_off(fs_info); |
| 351 | } |
| 352 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 353 | /* |
| 354 | * used for workers that require transaction commits (i.e., for the |
| 355 | * NOCOW case) |
| 356 | */ |
| 357 | static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx) |
| 358 | { |
| 359 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
| 360 | |
Filipe Manana | f55985f | 2015-02-09 21:14:24 +0000 | [diff] [blame] | 361 | atomic_inc(&sctx->refs); |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 362 | /* |
| 363 | * increment scrubs_running to prevent cancel requests from |
| 364 | * completing as long as a worker is running. we must also |
| 365 | * increment scrubs_paused to prevent deadlocking on pause |
| 366 | * requests used for transactions commits (as the worker uses a |
| 367 | * transaction context). it is safe to regard the worker |
| 368 | * as paused for all matters practical. effectively, we only |
| 369 | * avoid cancellation requests from completing. |
| 370 | */ |
| 371 | mutex_lock(&fs_info->scrub_lock); |
| 372 | atomic_inc(&fs_info->scrubs_running); |
| 373 | atomic_inc(&fs_info->scrubs_paused); |
| 374 | mutex_unlock(&fs_info->scrub_lock); |
Wang Shilong | 32a4478 | 2014-02-19 19:24:19 +0800 | [diff] [blame] | 375 | |
| 376 | /* |
| 377 | * check if @scrubs_running=@scrubs_paused condition |
| 378 | * inside wait_event() is not an atomic operation. |
| 379 | * which means we may inc/dec @scrub_running/paused |
| 380 | * at any time. Let's wake up @scrub_pause_wait as |
| 381 | * much as we can to let commit transaction blocked less. |
| 382 | */ |
| 383 | wake_up(&fs_info->scrub_pause_wait); |
| 384 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 385 | atomic_inc(&sctx->workers_pending); |
| 386 | } |
| 387 | |
| 388 | /* used for workers that require transaction commits */ |
| 389 | static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx) |
| 390 | { |
| 391 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
| 392 | |
| 393 | /* |
| 394 | * see scrub_pending_trans_workers_inc() why we're pretending |
| 395 | * to be paused in the scrub counters |
| 396 | */ |
| 397 | mutex_lock(&fs_info->scrub_lock); |
| 398 | atomic_dec(&fs_info->scrubs_running); |
| 399 | atomic_dec(&fs_info->scrubs_paused); |
| 400 | mutex_unlock(&fs_info->scrub_lock); |
| 401 | atomic_dec(&sctx->workers_pending); |
| 402 | wake_up(&fs_info->scrub_pause_wait); |
| 403 | wake_up(&sctx->list_wait); |
Filipe Manana | f55985f | 2015-02-09 21:14:24 +0000 | [diff] [blame] | 404 | scrub_put_ctx(sctx); |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 405 | } |
| 406 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 407 | static void scrub_free_csums(struct scrub_ctx *sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 408 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 409 | while (!list_empty(&sctx->csum_list)) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 410 | struct btrfs_ordered_sum *sum; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 411 | sum = list_first_entry(&sctx->csum_list, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 412 | struct btrfs_ordered_sum, list); |
| 413 | list_del(&sum->list); |
| 414 | kfree(sum); |
| 415 | } |
| 416 | } |
| 417 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 418 | static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 419 | { |
| 420 | int i; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 421 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 422 | if (!sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 423 | return; |
| 424 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 425 | scrub_free_wr_ctx(&sctx->wr_ctx); |
| 426 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 427 | /* this can happen when scrub is cancelled */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 428 | if (sctx->curr != -1) { |
| 429 | struct scrub_bio *sbio = sctx->bios[sctx->curr]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 430 | |
| 431 | for (i = 0; i < sbio->page_count; i++) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 432 | WARN_ON(!sbio->pagev[i]->page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 433 | scrub_block_put(sbio->pagev[i]->sblock); |
| 434 | } |
| 435 | bio_put(sbio->bio); |
| 436 | } |
| 437 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 438 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 439 | struct scrub_bio *sbio = sctx->bios[i]; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 440 | |
| 441 | if (!sbio) |
| 442 | break; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 443 | kfree(sbio); |
| 444 | } |
| 445 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 446 | scrub_free_csums(sctx); |
| 447 | kfree(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 448 | } |
| 449 | |
Filipe Manana | f55985f | 2015-02-09 21:14:24 +0000 | [diff] [blame] | 450 | static void scrub_put_ctx(struct scrub_ctx *sctx) |
| 451 | { |
| 452 | if (atomic_dec_and_test(&sctx->refs)) |
| 453 | scrub_free_ctx(sctx); |
| 454 | } |
| 455 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 456 | static noinline_for_stack |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 457 | 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] | 458 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 459 | struct scrub_ctx *sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 460 | int i; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 461 | struct btrfs_fs_info *fs_info = dev->dev_root->fs_info; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 462 | int ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 463 | |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 464 | sctx = kzalloc(sizeof(*sctx), GFP_KERNEL); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 465 | if (!sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 466 | goto nomem; |
Filipe Manana | f55985f | 2015-02-09 21:14:24 +0000 | [diff] [blame] | 467 | atomic_set(&sctx->refs, 1); |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 468 | sctx->is_dev_replace = is_dev_replace; |
Kent Overstreet | b54ffb7 | 2015-05-19 14:31:01 +0200 | [diff] [blame] | 469 | sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 470 | sctx->curr = -1; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 471 | sctx->dev_root = dev->dev_root; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 472 | for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 473 | struct scrub_bio *sbio; |
| 474 | |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 475 | sbio = kzalloc(sizeof(*sbio), GFP_KERNEL); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 476 | if (!sbio) |
| 477 | goto nomem; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 478 | sctx->bios[i] = sbio; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 479 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 480 | sbio->index = i; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 481 | sbio->sctx = sctx; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 482 | sbio->page_count = 0; |
Liu Bo | 9e0af23 | 2014-08-15 23:36:53 +0800 | [diff] [blame] | 483 | btrfs_init_work(&sbio->work, btrfs_scrub_helper, |
| 484 | scrub_bio_end_io_worker, NULL, NULL); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 485 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 486 | if (i != SCRUB_BIOS_PER_SCTX - 1) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 487 | sctx->bios[i]->next_free = i + 1; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 488 | else |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 489 | sctx->bios[i]->next_free = -1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 490 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 491 | sctx->first_free = 0; |
| 492 | sctx->nodesize = dev->dev_root->nodesize; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 493 | sctx->sectorsize = dev->dev_root->sectorsize; |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 494 | atomic_set(&sctx->bios_in_flight, 0); |
| 495 | atomic_set(&sctx->workers_pending, 0); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 496 | atomic_set(&sctx->cancel_req, 0); |
| 497 | sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy); |
| 498 | INIT_LIST_HEAD(&sctx->csum_list); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 499 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 500 | spin_lock_init(&sctx->list_lock); |
| 501 | spin_lock_init(&sctx->stat_lock); |
| 502 | init_waitqueue_head(&sctx->list_wait); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 503 | |
| 504 | ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info, |
| 505 | fs_info->dev_replace.tgtdev, is_dev_replace); |
| 506 | if (ret) { |
| 507 | scrub_free_ctx(sctx); |
| 508 | return ERR_PTR(ret); |
| 509 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 510 | return sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 511 | |
| 512 | nomem: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 513 | scrub_free_ctx(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 514 | return ERR_PTR(-ENOMEM); |
| 515 | } |
| 516 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 517 | static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root, |
| 518 | void *warn_ctx) |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 519 | { |
| 520 | u64 isize; |
| 521 | u32 nlink; |
| 522 | int ret; |
| 523 | int i; |
| 524 | struct extent_buffer *eb; |
| 525 | struct btrfs_inode_item *inode_item; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 526 | struct scrub_warning *swarn = warn_ctx; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 527 | struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info; |
| 528 | struct inode_fs_paths *ipath = NULL; |
| 529 | struct btrfs_root *local_root; |
| 530 | struct btrfs_key root_key; |
David Sterba | 1d4c08e | 2015-01-02 19:36:14 +0100 | [diff] [blame] | 531 | struct btrfs_key key; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 532 | |
| 533 | root_key.objectid = root; |
| 534 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 535 | root_key.offset = (u64)-1; |
| 536 | local_root = btrfs_read_fs_root_no_name(fs_info, &root_key); |
| 537 | if (IS_ERR(local_root)) { |
| 538 | ret = PTR_ERR(local_root); |
| 539 | goto err; |
| 540 | } |
| 541 | |
David Sterba | 14692cc | 2015-01-02 18:55:46 +0100 | [diff] [blame] | 542 | /* |
| 543 | * this makes the path point to (inum INODE_ITEM ioff) |
| 544 | */ |
David Sterba | 1d4c08e | 2015-01-02 19:36:14 +0100 | [diff] [blame] | 545 | key.objectid = inum; |
| 546 | key.type = BTRFS_INODE_ITEM_KEY; |
| 547 | key.offset = 0; |
| 548 | |
| 549 | ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 550 | if (ret) { |
| 551 | btrfs_release_path(swarn->path); |
| 552 | goto err; |
| 553 | } |
| 554 | |
| 555 | eb = swarn->path->nodes[0]; |
| 556 | inode_item = btrfs_item_ptr(eb, swarn->path->slots[0], |
| 557 | struct btrfs_inode_item); |
| 558 | isize = btrfs_inode_size(eb, inode_item); |
| 559 | nlink = btrfs_inode_nlink(eb, inode_item); |
| 560 | btrfs_release_path(swarn->path); |
| 561 | |
| 562 | ipath = init_ipath(4096, local_root, swarn->path); |
Dan Carpenter | 26bdef5 | 2011-11-16 11:28:01 +0300 | [diff] [blame] | 563 | if (IS_ERR(ipath)) { |
| 564 | ret = PTR_ERR(ipath); |
| 565 | ipath = NULL; |
| 566 | goto err; |
| 567 | } |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 568 | ret = paths_from_inode(inum, ipath); |
| 569 | |
| 570 | if (ret < 0) |
| 571 | goto err; |
| 572 | |
| 573 | /* |
| 574 | * we deliberately ignore the bit ipath might have been too small to |
| 575 | * hold all of the paths here |
| 576 | */ |
| 577 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) |
David Sterba | ecaeb14 | 2015-10-08 09:01:03 +0200 | [diff] [blame] | 578 | btrfs_warn_in_rcu(fs_info, "%s at logical %llu on dev " |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 579 | "%s, sector %llu, root %llu, inode %llu, offset %llu, " |
David Sterba | ecaeb14 | 2015-10-08 09:01:03 +0200 | [diff] [blame] | 580 | "length %llu, links %u (path: %s)", swarn->errstr, |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 581 | swarn->logical, rcu_str_deref(swarn->dev->name), |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 582 | (unsigned long long)swarn->sector, root, inum, offset, |
| 583 | min(isize - offset, (u64)PAGE_SIZE), nlink, |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 584 | (char *)(unsigned long)ipath->fspath->val[i]); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 585 | |
| 586 | free_ipath(ipath); |
| 587 | return 0; |
| 588 | |
| 589 | err: |
David Sterba | ecaeb14 | 2015-10-08 09:01:03 +0200 | [diff] [blame] | 590 | btrfs_warn_in_rcu(fs_info, "%s at logical %llu on dev " |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 591 | "%s, sector %llu, root %llu, inode %llu, offset %llu: path " |
David Sterba | ecaeb14 | 2015-10-08 09:01:03 +0200 | [diff] [blame] | 592 | "resolving failed with ret=%d", swarn->errstr, |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 593 | swarn->logical, rcu_str_deref(swarn->dev->name), |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 594 | (unsigned long long)swarn->sector, root, inum, offset, ret); |
| 595 | |
| 596 | free_ipath(ipath); |
| 597 | return 0; |
| 598 | } |
| 599 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 600 | static void scrub_print_warning(const char *errstr, struct scrub_block *sblock) |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 601 | { |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 602 | struct btrfs_device *dev; |
| 603 | struct btrfs_fs_info *fs_info; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 604 | struct btrfs_path *path; |
| 605 | struct btrfs_key found_key; |
| 606 | struct extent_buffer *eb; |
| 607 | struct btrfs_extent_item *ei; |
| 608 | struct scrub_warning swarn; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 609 | unsigned long ptr = 0; |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 610 | u64 extent_item_pos; |
Liu Bo | 69917e4 | 2012-09-07 20:01:28 -0600 | [diff] [blame] | 611 | u64 flags = 0; |
| 612 | u64 ref_root; |
| 613 | u32 item_size; |
Dan Carpenter | 07c9a8e | 2016-03-11 11:08:56 +0300 | [diff] [blame] | 614 | u8 ref_level = 0; |
Liu Bo | 69917e4 | 2012-09-07 20:01:28 -0600 | [diff] [blame] | 615 | int ret; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 616 | |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 617 | WARN_ON(sblock->page_count < 1); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 618 | dev = sblock->pagev[0]->dev; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 619 | fs_info = sblock->sctx->dev_root->fs_info; |
| 620 | |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 621 | path = btrfs_alloc_path(); |
David Sterba | 8b9456d | 2014-07-30 01:25:30 +0200 | [diff] [blame] | 622 | if (!path) |
| 623 | return; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 624 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 625 | swarn.sector = (sblock->pagev[0]->physical) >> 9; |
| 626 | swarn.logical = sblock->pagev[0]->logical; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 627 | swarn.errstr = errstr; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 628 | swarn.dev = NULL; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 629 | |
Liu Bo | 69917e4 | 2012-09-07 20:01:28 -0600 | [diff] [blame] | 630 | ret = extent_from_logical(fs_info, swarn.logical, path, &found_key, |
| 631 | &flags); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 632 | if (ret < 0) |
| 633 | goto out; |
| 634 | |
Jan Schmidt | 4692cf5 | 2011-12-02 14:56:41 +0100 | [diff] [blame] | 635 | extent_item_pos = swarn.logical - found_key.objectid; |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 636 | swarn.extent_item_size = found_key.offset; |
| 637 | |
| 638 | eb = path->nodes[0]; |
| 639 | ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); |
| 640 | item_size = btrfs_item_size_nr(eb, path->slots[0]); |
| 641 | |
Liu Bo | 69917e4 | 2012-09-07 20:01:28 -0600 | [diff] [blame] | 642 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 643 | do { |
Liu Bo | 6eda71d | 2014-06-09 10:54:07 +0800 | [diff] [blame] | 644 | ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, |
| 645 | item_size, &ref_root, |
| 646 | &ref_level); |
David Sterba | ecaeb14 | 2015-10-08 09:01:03 +0200 | [diff] [blame] | 647 | btrfs_warn_in_rcu(fs_info, |
| 648 | "%s at logical %llu on dev %s, " |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 649 | "sector %llu: metadata %s (level %d) in tree " |
David Sterba | ecaeb14 | 2015-10-08 09:01:03 +0200 | [diff] [blame] | 650 | "%llu", errstr, swarn.logical, |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 651 | rcu_str_deref(dev->name), |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 652 | (unsigned long long)swarn.sector, |
| 653 | ref_level ? "node" : "leaf", |
| 654 | ret < 0 ? -1 : ref_level, |
| 655 | ret < 0 ? -1 : ref_root); |
| 656 | } while (ret != 1); |
Josef Bacik | d8fe29e | 2013-03-29 08:09:34 -0600 | [diff] [blame] | 657 | btrfs_release_path(path); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 658 | } else { |
Josef Bacik | d8fe29e | 2013-03-29 08:09:34 -0600 | [diff] [blame] | 659 | btrfs_release_path(path); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 660 | swarn.path = path; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 661 | swarn.dev = dev; |
Jan Schmidt | 7a3ae2f | 2012-03-23 17:32:28 +0100 | [diff] [blame] | 662 | iterate_extent_inodes(fs_info, found_key.objectid, |
| 663 | extent_item_pos, 1, |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 664 | scrub_print_warning_inode, &swarn); |
| 665 | } |
| 666 | |
| 667 | out: |
| 668 | btrfs_free_path(path); |
Jan Schmidt | 558540c | 2011-06-13 19:59:12 +0200 | [diff] [blame] | 669 | } |
| 670 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 671 | 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] | 672 | { |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 673 | struct page *page = NULL; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 674 | unsigned long index; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 675 | struct scrub_fixup_nodatasum *fixup = fixup_ctx; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 676 | int ret; |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 677 | int corrected = 0; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 678 | struct btrfs_key key; |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 679 | struct inode *inode = NULL; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 680 | struct btrfs_fs_info *fs_info; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 681 | u64 end = offset + PAGE_SIZE - 1; |
| 682 | struct btrfs_root *local_root; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 683 | int srcu_index; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 684 | |
| 685 | key.objectid = root; |
| 686 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 687 | key.offset = (u64)-1; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 688 | |
| 689 | fs_info = fixup->root->fs_info; |
| 690 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); |
| 691 | |
| 692 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
| 693 | if (IS_ERR(local_root)) { |
| 694 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 695 | return PTR_ERR(local_root); |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 696 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 697 | |
| 698 | key.type = BTRFS_INODE_ITEM_KEY; |
| 699 | key.objectid = inum; |
| 700 | key.offset = 0; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 701 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
| 702 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 703 | if (IS_ERR(inode)) |
| 704 | return PTR_ERR(inode); |
| 705 | |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 706 | index = offset >> PAGE_CACHE_SHIFT; |
| 707 | |
| 708 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 709 | if (!page) { |
| 710 | ret = -ENOMEM; |
| 711 | goto out; |
| 712 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 713 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 714 | if (PageUptodate(page)) { |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 715 | if (PageDirty(page)) { |
| 716 | /* |
| 717 | * we need to write the data to the defect sector. the |
| 718 | * data that was in that sector is not in memory, |
| 719 | * because the page was modified. we must not write the |
| 720 | * modified page to that sector. |
| 721 | * |
| 722 | * TODO: what could be done here: wait for the delalloc |
| 723 | * runner to write out that page (might involve |
| 724 | * COW) and see whether the sector is still |
| 725 | * referenced afterwards. |
| 726 | * |
| 727 | * For the meantime, we'll treat this error |
| 728 | * incorrectable, although there is a chance that a |
| 729 | * later scrub will find the bad sector again and that |
| 730 | * there's no dirty page in memory, then. |
| 731 | */ |
| 732 | ret = -EIO; |
| 733 | goto out; |
| 734 | } |
Miao Xie | 1203b68 | 2014-09-12 18:44:01 +0800 | [diff] [blame] | 735 | ret = repair_io_failure(inode, offset, PAGE_SIZE, |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 736 | fixup->logical, page, |
Miao Xie | ffdd201 | 2014-09-12 18:44:00 +0800 | [diff] [blame] | 737 | offset - page_offset(page), |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 738 | fixup->mirror_num); |
| 739 | unlock_page(page); |
| 740 | corrected = !ret; |
| 741 | } else { |
| 742 | /* |
| 743 | * we need to get good data first. the general readpage path |
| 744 | * will call repair_io_failure for us, we just have to make |
| 745 | * sure we read the bad mirror. |
| 746 | */ |
| 747 | ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, |
| 748 | EXTENT_DAMAGED, GFP_NOFS); |
| 749 | if (ret) { |
| 750 | /* set_extent_bits should give proper error */ |
| 751 | WARN_ON(ret > 0); |
| 752 | if (ret > 0) |
| 753 | ret = -EFAULT; |
| 754 | goto out; |
| 755 | } |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 756 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 757 | ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page, |
| 758 | btrfs_get_extent, |
| 759 | fixup->mirror_num); |
| 760 | wait_on_page_locked(page); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 761 | |
Jan Schmidt | 5da6fcb | 2011-08-04 18:11:04 +0200 | [diff] [blame] | 762 | corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset, |
| 763 | end, EXTENT_DAMAGED, 0, NULL); |
| 764 | if (!corrected) |
| 765 | clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end, |
| 766 | EXTENT_DAMAGED, GFP_NOFS); |
| 767 | } |
| 768 | |
| 769 | out: |
| 770 | if (page) |
| 771 | put_page(page); |
Tobias Klauser | 7fb18a0 | 2014-04-25 14:58:05 +0200 | [diff] [blame] | 772 | |
| 773 | iput(inode); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 774 | |
| 775 | if (ret < 0) |
| 776 | return ret; |
| 777 | |
| 778 | if (ret == 0 && corrected) { |
| 779 | /* |
| 780 | * we only need to call readpage for one of the inodes belonging |
| 781 | * to this extent. so make iterate_extent_inodes stop |
| 782 | */ |
| 783 | return 1; |
| 784 | } |
| 785 | |
| 786 | return -EIO; |
| 787 | } |
| 788 | |
| 789 | static void scrub_fixup_nodatasum(struct btrfs_work *work) |
| 790 | { |
| 791 | int ret; |
| 792 | struct scrub_fixup_nodatasum *fixup; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 793 | struct scrub_ctx *sctx; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 794 | struct btrfs_trans_handle *trans = NULL; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 795 | struct btrfs_path *path; |
| 796 | int uncorrectable = 0; |
| 797 | |
| 798 | fixup = container_of(work, struct scrub_fixup_nodatasum, work); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 799 | sctx = fixup->sctx; |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 800 | |
| 801 | path = btrfs_alloc_path(); |
| 802 | if (!path) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 803 | spin_lock(&sctx->stat_lock); |
| 804 | ++sctx->stat.malloc_errors; |
| 805 | spin_unlock(&sctx->stat_lock); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 806 | uncorrectable = 1; |
| 807 | goto out; |
| 808 | } |
| 809 | |
| 810 | trans = btrfs_join_transaction(fixup->root); |
| 811 | if (IS_ERR(trans)) { |
| 812 | uncorrectable = 1; |
| 813 | goto out; |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * the idea is to trigger a regular read through the standard path. we |
| 818 | * read a page from the (failed) logical address by specifying the |
| 819 | * corresponding copynum of the failed sector. thus, that readpage is |
| 820 | * expected to fail. |
| 821 | * that is the point where on-the-fly error correction will kick in |
| 822 | * (once it's finished) and rewrite the failed sector if a good copy |
| 823 | * can be found. |
| 824 | */ |
| 825 | ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info, |
| 826 | path, scrub_fixup_readpage, |
| 827 | fixup); |
| 828 | if (ret < 0) { |
| 829 | uncorrectable = 1; |
| 830 | goto out; |
| 831 | } |
| 832 | WARN_ON(ret != 1); |
| 833 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 834 | spin_lock(&sctx->stat_lock); |
| 835 | ++sctx->stat.corrected_errors; |
| 836 | spin_unlock(&sctx->stat_lock); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 837 | |
| 838 | out: |
| 839 | if (trans && !IS_ERR(trans)) |
| 840 | btrfs_end_transaction(trans, fixup->root); |
| 841 | if (uncorrectable) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 842 | spin_lock(&sctx->stat_lock); |
| 843 | ++sctx->stat.uncorrectable_errors; |
| 844 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 845 | btrfs_dev_replace_stats_inc( |
| 846 | &sctx->dev_root->fs_info->dev_replace. |
| 847 | num_uncorrectable_read_errors); |
David Sterba | b14af3b | 2015-10-08 10:43:10 +0200 | [diff] [blame] | 848 | btrfs_err_rl_in_rcu(sctx->dev_root->fs_info, |
| 849 | "unable to fixup (nodatasum) error at logical %llu on dev %s", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 850 | fixup->logical, rcu_str_deref(fixup->dev->name)); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 851 | } |
| 852 | |
| 853 | btrfs_free_path(path); |
| 854 | kfree(fixup); |
| 855 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 856 | scrub_pending_trans_workers_dec(sctx); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 857 | } |
| 858 | |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 859 | static inline void scrub_get_recover(struct scrub_recover *recover) |
| 860 | { |
| 861 | atomic_inc(&recover->refs); |
| 862 | } |
| 863 | |
| 864 | static inline void scrub_put_recover(struct scrub_recover *recover) |
| 865 | { |
| 866 | if (atomic_dec_and_test(&recover->refs)) { |
Zhao Lei | 6e9606d | 2015-01-20 15:11:34 +0800 | [diff] [blame] | 867 | btrfs_put_bbio(recover->bbio); |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 868 | kfree(recover); |
| 869 | } |
| 870 | } |
| 871 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 872 | /* |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 873 | * scrub_handle_errored_block gets called when either verification of the |
| 874 | * pages failed or the bio failed to read, e.g. with EIO. In the latter |
| 875 | * case, this function handles all pages in the bio, even though only one |
| 876 | * may be bad. |
| 877 | * The goal of this function is to repair the errored block by using the |
| 878 | * contents of one of the mirrors. |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 879 | */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 880 | static int scrub_handle_errored_block(struct scrub_block *sblock_to_check) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 881 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 882 | struct scrub_ctx *sctx = sblock_to_check->sctx; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 883 | struct btrfs_device *dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 884 | struct btrfs_fs_info *fs_info; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 885 | u64 length; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 886 | u64 logical; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 887 | unsigned int failed_mirror_index; |
| 888 | unsigned int is_metadata; |
| 889 | unsigned int have_csum; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 890 | struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */ |
| 891 | struct scrub_block *sblock_bad; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 892 | int ret; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 893 | int mirror_index; |
| 894 | int page_num; |
| 895 | int success; |
| 896 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
| 897 | DEFAULT_RATELIMIT_BURST); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 898 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 899 | BUG_ON(sblock_to_check->page_count < 1); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 900 | fs_info = sctx->dev_root->fs_info; |
Stefan Behrens | 4ded4f6 | 2012-11-14 18:57:29 +0000 | [diff] [blame] | 901 | if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) { |
| 902 | /* |
| 903 | * if we find an error in a super block, we just report it. |
| 904 | * They will get written with the next transaction commit |
| 905 | * anyway |
| 906 | */ |
| 907 | spin_lock(&sctx->stat_lock); |
| 908 | ++sctx->stat.super_errors; |
| 909 | spin_unlock(&sctx->stat_lock); |
| 910 | return 0; |
| 911 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 912 | length = sblock_to_check->page_count * PAGE_SIZE; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 913 | logical = sblock_to_check->pagev[0]->logical; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 914 | BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1); |
| 915 | failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1; |
| 916 | is_metadata = !(sblock_to_check->pagev[0]->flags & |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 917 | BTRFS_EXTENT_FLAG_DATA); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 918 | have_csum = sblock_to_check->pagev[0]->have_csum; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 919 | dev = sblock_to_check->pagev[0]->dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 920 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 921 | if (sctx->is_dev_replace && !is_metadata && !have_csum) { |
| 922 | sblocks_for_recheck = NULL; |
| 923 | goto nodatasum_case; |
| 924 | } |
| 925 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 926 | /* |
| 927 | * read all mirrors one after the other. This includes to |
| 928 | * re-read the extent or metadata block that failed (that was |
| 929 | * the cause that this fixup code is called) another time, |
| 930 | * page by page this time in order to know which pages |
| 931 | * caused I/O errors and which ones are good (for all mirrors). |
| 932 | * It is the goal to handle the situation when more than one |
| 933 | * mirror contains I/O errors, but the errors do not |
| 934 | * overlap, i.e. the data can be repaired by selecting the |
| 935 | * pages from those mirrors without I/O error on the |
| 936 | * particular pages. One example (with blocks >= 2 * PAGE_SIZE) |
| 937 | * would be that mirror #1 has an I/O error on the first page, |
| 938 | * the second page is good, and mirror #2 has an I/O error on |
| 939 | * the second page, but the first page is good. |
| 940 | * Then the first page of the first mirror can be repaired by |
| 941 | * taking the first page of the second mirror, and the |
| 942 | * second page of the second mirror can be repaired by |
| 943 | * copying the contents of the 2nd page of the 1st mirror. |
| 944 | * One more note: if the pages of one mirror contain I/O |
| 945 | * errors, the checksum cannot be verified. In order to get |
| 946 | * the best data for repairing, the first attempt is to find |
| 947 | * a mirror without I/O errors and with a validated checksum. |
| 948 | * Only if this is not possible, the pages are picked from |
| 949 | * mirrors with I/O errors without considering the checksum. |
| 950 | * If the latter is the case, at the end, the checksum of the |
| 951 | * repaired area is verified in order to correctly maintain |
| 952 | * the statistics. |
| 953 | */ |
| 954 | |
David Sterba | 31e818f | 2015-02-20 18:00:26 +0100 | [diff] [blame] | 955 | sblocks_for_recheck = kcalloc(BTRFS_MAX_MIRRORS, |
| 956 | sizeof(*sblocks_for_recheck), GFP_NOFS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 957 | if (!sblocks_for_recheck) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 958 | spin_lock(&sctx->stat_lock); |
| 959 | sctx->stat.malloc_errors++; |
| 960 | sctx->stat.read_errors++; |
| 961 | sctx->stat.uncorrectable_errors++; |
| 962 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 963 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 964 | goto out; |
| 965 | } |
| 966 | |
| 967 | /* setup the context, map the logical blocks and alloc the pages */ |
Zhao Lei | be50a8d | 2015-01-20 15:11:42 +0800 | [diff] [blame] | 968 | ret = scrub_setup_recheck_block(sblock_to_check, sblocks_for_recheck); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 969 | if (ret) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 970 | spin_lock(&sctx->stat_lock); |
| 971 | sctx->stat.read_errors++; |
| 972 | sctx->stat.uncorrectable_errors++; |
| 973 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 974 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 975 | goto out; |
| 976 | } |
| 977 | BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS); |
| 978 | sblock_bad = sblocks_for_recheck + failed_mirror_index; |
| 979 | |
| 980 | /* build and submit the bios for the failed mirror, check checksums */ |
Zhao Lei | affe4a5 | 2015-08-24 21:32:06 +0800 | [diff] [blame] | 981 | scrub_recheck_block(fs_info, sblock_bad, 1); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 982 | |
| 983 | if (!sblock_bad->header_error && !sblock_bad->checksum_error && |
| 984 | sblock_bad->no_io_error_seen) { |
| 985 | /* |
| 986 | * the error disappeared after reading page by page, or |
| 987 | * the area was part of a huge bio and other parts of the |
| 988 | * bio caused I/O errors, or the block layer merged several |
| 989 | * read requests into one and the error is caused by a |
| 990 | * different bio (usually one of the two latter cases is |
| 991 | * the cause) |
| 992 | */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 993 | spin_lock(&sctx->stat_lock); |
| 994 | sctx->stat.unverified_errors++; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 995 | sblock_to_check->data_corrected = 1; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 996 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 997 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 998 | if (sctx->is_dev_replace) |
| 999 | scrub_write_block_to_dev_replace(sblock_bad); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1000 | goto out; |
| 1001 | } |
| 1002 | |
| 1003 | if (!sblock_bad->no_io_error_seen) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1004 | spin_lock(&sctx->stat_lock); |
| 1005 | sctx->stat.read_errors++; |
| 1006 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1007 | if (__ratelimit(&_rs)) |
| 1008 | scrub_print_warning("i/o error", sblock_to_check); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1009 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1010 | } else if (sblock_bad->checksum_error) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1011 | spin_lock(&sctx->stat_lock); |
| 1012 | sctx->stat.csum_errors++; |
| 1013 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1014 | if (__ratelimit(&_rs)) |
| 1015 | scrub_print_warning("checksum error", sblock_to_check); |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1016 | btrfs_dev_stat_inc_and_print(dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1017 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1018 | } else if (sblock_bad->header_error) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1019 | spin_lock(&sctx->stat_lock); |
| 1020 | sctx->stat.verify_errors++; |
| 1021 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1022 | if (__ratelimit(&_rs)) |
| 1023 | scrub_print_warning("checksum/header error", |
| 1024 | sblock_to_check); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1025 | if (sblock_bad->generation_error) |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1026 | btrfs_dev_stat_inc_and_print(dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1027 | BTRFS_DEV_STAT_GENERATION_ERRS); |
| 1028 | else |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1029 | btrfs_dev_stat_inc_and_print(dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1030 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1031 | } |
| 1032 | |
Ilya Dryomov | 33ef30a | 2013-11-03 19:06:38 +0200 | [diff] [blame] | 1033 | if (sctx->readonly) { |
| 1034 | ASSERT(!sctx->is_dev_replace); |
| 1035 | goto out; |
| 1036 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1037 | |
| 1038 | if (!is_metadata && !have_csum) { |
| 1039 | struct scrub_fixup_nodatasum *fixup_nodatasum; |
| 1040 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1041 | WARN_ON(sctx->is_dev_replace); |
| 1042 | |
Zhao Lei | b25c94c | 2015-01-20 15:11:35 +0800 | [diff] [blame] | 1043 | nodatasum_case: |
| 1044 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1045 | /* |
| 1046 | * !is_metadata and !have_csum, this means that the data |
| 1047 | * might not be COW'ed, that it might be modified |
| 1048 | * concurrently. The general strategy to work on the |
| 1049 | * commit root does not help in the case when COW is not |
| 1050 | * used. |
| 1051 | */ |
| 1052 | fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS); |
| 1053 | if (!fixup_nodatasum) |
| 1054 | goto did_not_correct_error; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1055 | fixup_nodatasum->sctx = sctx; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1056 | fixup_nodatasum->dev = dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1057 | fixup_nodatasum->logical = logical; |
| 1058 | fixup_nodatasum->root = fs_info->extent_root; |
| 1059 | fixup_nodatasum->mirror_num = failed_mirror_index + 1; |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 1060 | scrub_pending_trans_workers_inc(sctx); |
Liu Bo | 9e0af23 | 2014-08-15 23:36:53 +0800 | [diff] [blame] | 1061 | btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper, |
| 1062 | scrub_fixup_nodatasum, NULL, NULL); |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 1063 | btrfs_queue_work(fs_info->scrub_workers, |
| 1064 | &fixup_nodatasum->work); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1065 | goto out; |
| 1066 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1067 | |
| 1068 | /* |
| 1069 | * now build and submit the bios for the other mirrors, check |
Stefan Behrens | cb2ced7 | 2012-11-02 16:14:21 +0100 | [diff] [blame] | 1070 | * checksums. |
| 1071 | * First try to pick the mirror which is completely without I/O |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1072 | * errors and also does not have a checksum error. |
| 1073 | * If one is found, and if a checksum is present, the full block |
| 1074 | * that is known to contain an error is rewritten. Afterwards |
| 1075 | * the block is known to be corrected. |
| 1076 | * If a mirror is found which is completely correct, and no |
| 1077 | * checksum is present, only those pages are rewritten that had |
| 1078 | * an I/O error in the block to be repaired, since it cannot be |
| 1079 | * determined, which copy of the other pages is better (and it |
| 1080 | * could happen otherwise that a correct page would be |
| 1081 | * overwritten by a bad one). |
| 1082 | */ |
| 1083 | for (mirror_index = 0; |
| 1084 | mirror_index < BTRFS_MAX_MIRRORS && |
| 1085 | sblocks_for_recheck[mirror_index].page_count > 0; |
| 1086 | mirror_index++) { |
Stefan Behrens | cb2ced7 | 2012-11-02 16:14:21 +0100 | [diff] [blame] | 1087 | struct scrub_block *sblock_other; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1088 | |
Stefan Behrens | cb2ced7 | 2012-11-02 16:14:21 +0100 | [diff] [blame] | 1089 | if (mirror_index == failed_mirror_index) |
| 1090 | continue; |
| 1091 | sblock_other = sblocks_for_recheck + mirror_index; |
| 1092 | |
| 1093 | /* build and submit the bios, check checksums */ |
Zhao Lei | affe4a5 | 2015-08-24 21:32:06 +0800 | [diff] [blame] | 1094 | scrub_recheck_block(fs_info, sblock_other, 0); |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1095 | |
| 1096 | if (!sblock_other->header_error && |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1097 | !sblock_other->checksum_error && |
| 1098 | sblock_other->no_io_error_seen) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1099 | if (sctx->is_dev_replace) { |
| 1100 | scrub_write_block_to_dev_replace(sblock_other); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1101 | goto corrected_error; |
Zhao Lei | 114ab50 | 2015-01-20 15:11:36 +0800 | [diff] [blame] | 1102 | } else { |
| 1103 | ret = scrub_repair_block_from_good_copy( |
| 1104 | sblock_bad, sblock_other); |
| 1105 | if (!ret) |
| 1106 | goto corrected_error; |
| 1107 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1108 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1109 | } |
| 1110 | |
Zhao Lei | b968fed | 2015-01-20 15:11:41 +0800 | [diff] [blame] | 1111 | if (sblock_bad->no_io_error_seen && !sctx->is_dev_replace) |
| 1112 | goto did_not_correct_error; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1113 | |
| 1114 | /* |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1115 | * 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] | 1116 | * repaired, continue by picking good copies of those pages. |
| 1117 | * Select the good pages from mirrors to rewrite bad pages from |
| 1118 | * the area to fix. Afterwards verify the checksum of the block |
| 1119 | * that is supposed to be repaired. This verification step is |
| 1120 | * only done for the purpose of statistic counting and for the |
| 1121 | * final scrub report, whether errors remain. |
| 1122 | * A perfect algorithm could make use of the checksum and try |
| 1123 | * all possible combinations of pages from the different mirrors |
| 1124 | * until the checksum verification succeeds. For example, when |
| 1125 | * the 2nd page of mirror #1 faces I/O errors, and the 2nd page |
| 1126 | * of mirror #2 is readable but the final checksum test fails, |
| 1127 | * then the 2nd page of mirror #3 could be tried, whether now |
| 1128 | * the final checksum succeedes. But this would be a rare |
| 1129 | * exception and is therefore not implemented. At least it is |
| 1130 | * avoided that the good copy is overwritten. |
| 1131 | * A more useful improvement would be to pick the sectors |
| 1132 | * without I/O error based on sector sizes (512 bytes on legacy |
| 1133 | * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one |
| 1134 | * mirror could be repaired by taking 512 byte of a different |
| 1135 | * mirror, even if other 512 byte sectors in the same PAGE_SIZE |
| 1136 | * area are unreadable. |
| 1137 | */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1138 | success = 1; |
Zhao Lei | b968fed | 2015-01-20 15:11:41 +0800 | [diff] [blame] | 1139 | for (page_num = 0; page_num < sblock_bad->page_count; |
| 1140 | page_num++) { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1141 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
Zhao Lei | b968fed | 2015-01-20 15:11:41 +0800 | [diff] [blame] | 1142 | struct scrub_block *sblock_other = NULL; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1143 | |
Zhao Lei | b968fed | 2015-01-20 15:11:41 +0800 | [diff] [blame] | 1144 | /* skip no-io-error page in scrub */ |
| 1145 | if (!page_bad->io_error && !sctx->is_dev_replace) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1146 | continue; |
| 1147 | |
Zhao Lei | b968fed | 2015-01-20 15:11:41 +0800 | [diff] [blame] | 1148 | /* try to find no-io-error page in mirrors */ |
| 1149 | if (page_bad->io_error) { |
| 1150 | for (mirror_index = 0; |
| 1151 | mirror_index < BTRFS_MAX_MIRRORS && |
| 1152 | sblocks_for_recheck[mirror_index].page_count > 0; |
| 1153 | mirror_index++) { |
| 1154 | if (!sblocks_for_recheck[mirror_index]. |
| 1155 | pagev[page_num]->io_error) { |
| 1156 | sblock_other = sblocks_for_recheck + |
| 1157 | mirror_index; |
| 1158 | break; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1159 | } |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 1160 | } |
Zhao Lei | b968fed | 2015-01-20 15:11:41 +0800 | [diff] [blame] | 1161 | if (!sblock_other) |
| 1162 | success = 0; |
Jan Schmidt | 13db62b | 2011-06-13 19:56:13 +0200 | [diff] [blame] | 1163 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1164 | |
Zhao Lei | b968fed | 2015-01-20 15:11:41 +0800 | [diff] [blame] | 1165 | if (sctx->is_dev_replace) { |
| 1166 | /* |
| 1167 | * did not find a mirror to fetch the page |
| 1168 | * from. scrub_write_page_to_dev_replace() |
| 1169 | * handles this case (page->io_error), by |
| 1170 | * filling the block with zeros before |
| 1171 | * submitting the write request |
| 1172 | */ |
| 1173 | if (!sblock_other) |
| 1174 | sblock_other = sblock_bad; |
| 1175 | |
| 1176 | if (scrub_write_page_to_dev_replace(sblock_other, |
| 1177 | page_num) != 0) { |
| 1178 | btrfs_dev_replace_stats_inc( |
| 1179 | &sctx->dev_root-> |
| 1180 | fs_info->dev_replace. |
| 1181 | num_write_errors); |
| 1182 | success = 0; |
| 1183 | } |
| 1184 | } else if (sblock_other) { |
| 1185 | ret = scrub_repair_page_from_good_copy(sblock_bad, |
| 1186 | sblock_other, |
| 1187 | page_num, 0); |
| 1188 | if (0 == ret) |
| 1189 | page_bad->io_error = 0; |
| 1190 | else |
| 1191 | success = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1192 | } |
| 1193 | } |
| 1194 | |
Zhao Lei | b968fed | 2015-01-20 15:11:41 +0800 | [diff] [blame] | 1195 | if (success && !sctx->is_dev_replace) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1196 | if (is_metadata || have_csum) { |
| 1197 | /* |
| 1198 | * need to verify the checksum now that all |
| 1199 | * sectors on disk are repaired (the write |
| 1200 | * request for data to be repaired is on its way). |
| 1201 | * Just be lazy and use scrub_recheck_block() |
| 1202 | * which re-reads the data before the checksum |
| 1203 | * is verified, but most likely the data comes out |
| 1204 | * of the page cache. |
| 1205 | */ |
Zhao Lei | affe4a5 | 2015-08-24 21:32:06 +0800 | [diff] [blame] | 1206 | scrub_recheck_block(fs_info, sblock_bad, 1); |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1207 | if (!sblock_bad->header_error && |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1208 | !sblock_bad->checksum_error && |
| 1209 | sblock_bad->no_io_error_seen) |
| 1210 | goto corrected_error; |
| 1211 | else |
| 1212 | goto did_not_correct_error; |
| 1213 | } else { |
| 1214 | corrected_error: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1215 | spin_lock(&sctx->stat_lock); |
| 1216 | sctx->stat.corrected_errors++; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 1217 | sblock_to_check->data_corrected = 1; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1218 | spin_unlock(&sctx->stat_lock); |
David Sterba | b14af3b | 2015-10-08 10:43:10 +0200 | [diff] [blame] | 1219 | btrfs_err_rl_in_rcu(fs_info, |
| 1220 | "fixed up error at logical %llu on dev %s", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1221 | logical, rcu_str_deref(dev->name)); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1222 | } |
| 1223 | } else { |
| 1224 | did_not_correct_error: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1225 | spin_lock(&sctx->stat_lock); |
| 1226 | sctx->stat.uncorrectable_errors++; |
| 1227 | spin_unlock(&sctx->stat_lock); |
David Sterba | b14af3b | 2015-10-08 10:43:10 +0200 | [diff] [blame] | 1228 | btrfs_err_rl_in_rcu(fs_info, |
| 1229 | "unable to fixup (regular) error at logical %llu on dev %s", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1230 | logical, rcu_str_deref(dev->name)); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1231 | } |
| 1232 | |
| 1233 | out: |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1234 | if (sblocks_for_recheck) { |
| 1235 | for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS; |
| 1236 | mirror_index++) { |
| 1237 | struct scrub_block *sblock = sblocks_for_recheck + |
| 1238 | mirror_index; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1239 | struct scrub_recover *recover; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1240 | int page_index; |
| 1241 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1242 | for (page_index = 0; page_index < sblock->page_count; |
| 1243 | page_index++) { |
| 1244 | sblock->pagev[page_index]->sblock = NULL; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1245 | recover = sblock->pagev[page_index]->recover; |
| 1246 | if (recover) { |
| 1247 | scrub_put_recover(recover); |
| 1248 | sblock->pagev[page_index]->recover = |
| 1249 | NULL; |
| 1250 | } |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1251 | scrub_page_put(sblock->pagev[page_index]); |
| 1252 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1253 | } |
| 1254 | kfree(sblocks_for_recheck); |
| 1255 | } |
| 1256 | |
| 1257 | return 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1258 | } |
| 1259 | |
Zhao Lei | 8e5cfb5 | 2015-01-20 15:11:33 +0800 | [diff] [blame] | 1260 | static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio) |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1261 | { |
Zhao Lei | 10f1190 | 2015-01-20 15:11:43 +0800 | [diff] [blame] | 1262 | if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5) |
| 1263 | return 2; |
| 1264 | else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6) |
| 1265 | return 3; |
| 1266 | else |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1267 | return (int)bbio->num_stripes; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1268 | } |
| 1269 | |
Zhao Lei | 10f1190 | 2015-01-20 15:11:43 +0800 | [diff] [blame] | 1270 | static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type, |
| 1271 | u64 *raid_map, |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1272 | u64 mapped_length, |
| 1273 | int nstripes, int mirror, |
| 1274 | int *stripe_index, |
| 1275 | u64 *stripe_offset) |
| 1276 | { |
| 1277 | int i; |
| 1278 | |
Zhao Lei | ffe2d20 | 2015-01-20 15:11:44 +0800 | [diff] [blame] | 1279 | if (map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1280 | /* RAID5/6 */ |
| 1281 | for (i = 0; i < nstripes; i++) { |
| 1282 | if (raid_map[i] == RAID6_Q_STRIPE || |
| 1283 | raid_map[i] == RAID5_P_STRIPE) |
| 1284 | continue; |
| 1285 | |
| 1286 | if (logical >= raid_map[i] && |
| 1287 | logical < raid_map[i] + mapped_length) |
| 1288 | break; |
| 1289 | } |
| 1290 | |
| 1291 | *stripe_index = i; |
| 1292 | *stripe_offset = logical - raid_map[i]; |
| 1293 | } else { |
| 1294 | /* The other RAID type */ |
| 1295 | *stripe_index = mirror; |
| 1296 | *stripe_offset = 0; |
| 1297 | } |
| 1298 | } |
| 1299 | |
Zhao Lei | be50a8d | 2015-01-20 15:11:42 +0800 | [diff] [blame] | 1300 | static int scrub_setup_recheck_block(struct scrub_block *original_sblock, |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1301 | struct scrub_block *sblocks_for_recheck) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1302 | { |
Zhao Lei | be50a8d | 2015-01-20 15:11:42 +0800 | [diff] [blame] | 1303 | struct scrub_ctx *sctx = original_sblock->sctx; |
| 1304 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
| 1305 | u64 length = original_sblock->page_count * PAGE_SIZE; |
| 1306 | u64 logical = original_sblock->pagev[0]->logical; |
Zhao Lei | 4734b7e | 2015-08-19 22:39:18 +0800 | [diff] [blame] | 1307 | u64 generation = original_sblock->pagev[0]->generation; |
| 1308 | u64 flags = original_sblock->pagev[0]->flags; |
| 1309 | u64 have_csum = original_sblock->pagev[0]->have_csum; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1310 | struct scrub_recover *recover; |
| 1311 | struct btrfs_bio *bbio; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1312 | u64 sublen; |
| 1313 | u64 mapped_length; |
| 1314 | u64 stripe_offset; |
| 1315 | int stripe_index; |
Zhao Lei | be50a8d | 2015-01-20 15:11:42 +0800 | [diff] [blame] | 1316 | int page_index = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1317 | int mirror_index; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1318 | int nmirrors; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1319 | int ret; |
| 1320 | |
| 1321 | /* |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 1322 | * note: the two members refs and outstanding_pages |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1323 | * are not used (and not set) in the blocks that are used for |
| 1324 | * the recheck procedure |
| 1325 | */ |
| 1326 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1327 | while (length > 0) { |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1328 | sublen = min_t(u64, length, PAGE_SIZE); |
| 1329 | mapped_length = sublen; |
| 1330 | bbio = NULL; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1331 | |
| 1332 | /* |
| 1333 | * with a length of PAGE_SIZE, each returned stripe |
| 1334 | * represents one mirror |
| 1335 | */ |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1336 | ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical, |
Zhao Lei | 8e5cfb5 | 2015-01-20 15:11:33 +0800 | [diff] [blame] | 1337 | &mapped_length, &bbio, 0, 1); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1338 | if (ret || !bbio || mapped_length < sublen) { |
Zhao Lei | 6e9606d | 2015-01-20 15:11:34 +0800 | [diff] [blame] | 1339 | btrfs_put_bbio(bbio); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1340 | return -EIO; |
| 1341 | } |
| 1342 | |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1343 | recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS); |
| 1344 | if (!recover) { |
Zhao Lei | 6e9606d | 2015-01-20 15:11:34 +0800 | [diff] [blame] | 1345 | btrfs_put_bbio(bbio); |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1346 | return -ENOMEM; |
| 1347 | } |
| 1348 | |
| 1349 | atomic_set(&recover->refs, 1); |
| 1350 | recover->bbio = bbio; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1351 | recover->map_length = mapped_length; |
| 1352 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1353 | BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO); |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1354 | |
Zhao Lei | be50a8d | 2015-01-20 15:11:42 +0800 | [diff] [blame] | 1355 | nmirrors = min(scrub_nr_raid_mirrors(bbio), BTRFS_MAX_MIRRORS); |
Zhao Lei | 10f1190 | 2015-01-20 15:11:43 +0800 | [diff] [blame] | 1356 | |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1357 | for (mirror_index = 0; mirror_index < nmirrors; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1358 | mirror_index++) { |
| 1359 | struct scrub_block *sblock; |
| 1360 | struct scrub_page *page; |
| 1361 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1362 | sblock = sblocks_for_recheck + mirror_index; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1363 | sblock->sctx = sctx; |
Zhao Lei | 4734b7e | 2015-08-19 22:39:18 +0800 | [diff] [blame] | 1364 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1365 | page = kzalloc(sizeof(*page), GFP_NOFS); |
| 1366 | if (!page) { |
| 1367 | leave_nomem: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1368 | spin_lock(&sctx->stat_lock); |
| 1369 | sctx->stat.malloc_errors++; |
| 1370 | spin_unlock(&sctx->stat_lock); |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1371 | scrub_put_recover(recover); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1372 | return -ENOMEM; |
| 1373 | } |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1374 | scrub_page_get(page); |
| 1375 | sblock->pagev[page_index] = page; |
Zhao Lei | 4734b7e | 2015-08-19 22:39:18 +0800 | [diff] [blame] | 1376 | page->sblock = sblock; |
| 1377 | page->flags = flags; |
| 1378 | page->generation = generation; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1379 | page->logical = logical; |
Zhao Lei | 4734b7e | 2015-08-19 22:39:18 +0800 | [diff] [blame] | 1380 | page->have_csum = have_csum; |
| 1381 | if (have_csum) |
| 1382 | memcpy(page->csum, |
| 1383 | original_sblock->pagev[0]->csum, |
| 1384 | sctx->csum_size); |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1385 | |
Zhao Lei | 10f1190 | 2015-01-20 15:11:43 +0800 | [diff] [blame] | 1386 | scrub_stripe_index_and_offset(logical, |
| 1387 | bbio->map_type, |
| 1388 | bbio->raid_map, |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1389 | mapped_length, |
Zhao Lei | e34c330 | 2015-01-20 15:11:31 +0800 | [diff] [blame] | 1390 | bbio->num_stripes - |
| 1391 | bbio->num_tgtdevs, |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1392 | mirror_index, |
| 1393 | &stripe_index, |
| 1394 | &stripe_offset); |
| 1395 | page->physical = bbio->stripes[stripe_index].physical + |
| 1396 | stripe_offset; |
| 1397 | page->dev = bbio->stripes[stripe_index].dev; |
| 1398 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1399 | BUG_ON(page_index >= original_sblock->page_count); |
| 1400 | page->physical_for_dev_replace = |
| 1401 | original_sblock->pagev[page_index]-> |
| 1402 | physical_for_dev_replace; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1403 | /* for missing devices, dev->bdev is NULL */ |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1404 | page->mirror_num = mirror_index + 1; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1405 | sblock->page_count++; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1406 | page->page = alloc_page(GFP_NOFS); |
| 1407 | if (!page->page) |
| 1408 | goto leave_nomem; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1409 | |
| 1410 | scrub_get_recover(recover); |
| 1411 | page->recover = recover; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1412 | } |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1413 | scrub_put_recover(recover); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1414 | length -= sublen; |
| 1415 | logical += sublen; |
| 1416 | page_index++; |
| 1417 | } |
| 1418 | |
| 1419 | return 0; |
| 1420 | } |
| 1421 | |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1422 | struct scrub_bio_ret { |
| 1423 | struct completion event; |
| 1424 | int error; |
| 1425 | }; |
| 1426 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1427 | static void scrub_bio_wait_endio(struct bio *bio) |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1428 | { |
| 1429 | struct scrub_bio_ret *ret = bio->bi_private; |
| 1430 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1431 | ret->error = bio->bi_error; |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1432 | complete(&ret->event); |
| 1433 | } |
| 1434 | |
| 1435 | static inline int scrub_is_page_on_raid56(struct scrub_page *page) |
| 1436 | { |
Zhao Lei | 10f1190 | 2015-01-20 15:11:43 +0800 | [diff] [blame] | 1437 | return page->recover && |
Zhao Lei | ffe2d20 | 2015-01-20 15:11:44 +0800 | [diff] [blame] | 1438 | (page->recover->bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK); |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1439 | } |
| 1440 | |
| 1441 | static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info, |
| 1442 | struct bio *bio, |
| 1443 | struct scrub_page *page) |
| 1444 | { |
| 1445 | struct scrub_bio_ret done; |
| 1446 | int ret; |
| 1447 | |
| 1448 | init_completion(&done.event); |
| 1449 | done.error = 0; |
| 1450 | bio->bi_iter.bi_sector = page->logical >> 9; |
| 1451 | bio->bi_private = &done; |
| 1452 | bio->bi_end_io = scrub_bio_wait_endio; |
| 1453 | |
| 1454 | ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio, |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1455 | page->recover->map_length, |
Miao Xie | 4245215 | 2014-11-25 16:39:28 +0800 | [diff] [blame] | 1456 | page->mirror_num, 0); |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1457 | if (ret) |
| 1458 | return ret; |
| 1459 | |
| 1460 | wait_for_completion(&done.event); |
| 1461 | if (done.error) |
| 1462 | return -EIO; |
| 1463 | |
| 1464 | return 0; |
| 1465 | } |
| 1466 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1467 | /* |
| 1468 | * this function will check the on disk data for checksum errors, header |
| 1469 | * errors and read I/O errors. If any I/O errors happen, the exact pages |
| 1470 | * which are errored are marked as being bad. The goal is to enable scrub |
| 1471 | * to take those pages that are not errored from all the mirrors so that |
| 1472 | * the pages that are errored in the just handled mirror can be repaired. |
| 1473 | */ |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1474 | static void scrub_recheck_block(struct btrfs_fs_info *fs_info, |
Zhao Lei | affe4a5 | 2015-08-24 21:32:06 +0800 | [diff] [blame] | 1475 | struct scrub_block *sblock, |
| 1476 | int retry_failed_mirror) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1477 | { |
| 1478 | int page_num; |
| 1479 | |
| 1480 | sblock->no_io_error_seen = 1; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1481 | |
| 1482 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
| 1483 | struct bio *bio; |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1484 | struct scrub_page *page = sblock->pagev[page_num]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1485 | |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1486 | if (page->dev->bdev == NULL) { |
Stefan Behrens | ea9947b | 2012-05-04 15:16:07 -0400 | [diff] [blame] | 1487 | page->io_error = 1; |
| 1488 | sblock->no_io_error_seen = 0; |
| 1489 | continue; |
| 1490 | } |
| 1491 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1492 | WARN_ON(!page->page); |
Chris Mason | 9be3395 | 2013-05-17 18:30:14 -0400 | [diff] [blame] | 1493 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1494 | if (!bio) { |
| 1495 | page->io_error = 1; |
| 1496 | sblock->no_io_error_seen = 0; |
| 1497 | continue; |
| 1498 | } |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1499 | bio->bi_bdev = page->dev->bdev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1500 | |
Stefan Behrens | 34f5c8e | 2012-11-02 16:16:26 +0100 | [diff] [blame] | 1501 | bio_add_page(bio, page->page, PAGE_SIZE, 0); |
Miao Xie | af8e2d1 | 2014-10-23 14:42:50 +0800 | [diff] [blame] | 1502 | if (!retry_failed_mirror && scrub_is_page_on_raid56(page)) { |
| 1503 | if (scrub_submit_raid56_bio_wait(fs_info, bio, page)) |
| 1504 | sblock->no_io_error_seen = 0; |
| 1505 | } else { |
| 1506 | bio->bi_iter.bi_sector = page->physical >> 9; |
| 1507 | |
| 1508 | if (btrfsic_submit_bio_wait(READ, bio)) |
| 1509 | sblock->no_io_error_seen = 0; |
| 1510 | } |
Kent Overstreet | 33879d4 | 2013-11-23 22:33:32 -0800 | [diff] [blame] | 1511 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1512 | bio_put(bio); |
| 1513 | } |
| 1514 | |
| 1515 | if (sblock->no_io_error_seen) |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1516 | scrub_recheck_block_checksum(sblock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1517 | } |
| 1518 | |
Miao Xie | 17a9be2 | 2014-07-24 11:37:08 +0800 | [diff] [blame] | 1519 | static inline int scrub_check_fsid(u8 fsid[], |
| 1520 | struct scrub_page *spage) |
| 1521 | { |
| 1522 | struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices; |
| 1523 | int ret; |
| 1524 | |
| 1525 | ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE); |
| 1526 | return !ret; |
| 1527 | } |
| 1528 | |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1529 | static void scrub_recheck_block_checksum(struct scrub_block *sblock) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1530 | { |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1531 | sblock->header_error = 0; |
| 1532 | sblock->checksum_error = 0; |
| 1533 | sblock->generation_error = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1534 | |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1535 | if (sblock->pagev[0]->flags & BTRFS_EXTENT_FLAG_DATA) |
| 1536 | scrub_checksum_data(sblock); |
| 1537 | else |
| 1538 | scrub_checksum_tree_block(sblock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1539 | } |
| 1540 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1541 | static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad, |
Zhao Lei | 114ab50 | 2015-01-20 15:11:36 +0800 | [diff] [blame] | 1542 | struct scrub_block *sblock_good) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1543 | { |
| 1544 | int page_num; |
| 1545 | int ret = 0; |
| 1546 | |
| 1547 | for (page_num = 0; page_num < sblock_bad->page_count; page_num++) { |
| 1548 | int ret_sub; |
| 1549 | |
| 1550 | ret_sub = scrub_repair_page_from_good_copy(sblock_bad, |
| 1551 | sblock_good, |
Zhao Lei | 114ab50 | 2015-01-20 15:11:36 +0800 | [diff] [blame] | 1552 | page_num, 1); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1553 | if (ret_sub) |
| 1554 | ret = ret_sub; |
| 1555 | } |
| 1556 | |
| 1557 | return ret; |
| 1558 | } |
| 1559 | |
| 1560 | static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad, |
| 1561 | struct scrub_block *sblock_good, |
| 1562 | int page_num, int force_write) |
| 1563 | { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1564 | struct scrub_page *page_bad = sblock_bad->pagev[page_num]; |
| 1565 | struct scrub_page *page_good = sblock_good->pagev[page_num]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1566 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1567 | BUG_ON(page_bad->page == NULL); |
| 1568 | BUG_ON(page_good->page == NULL); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1569 | if (force_write || sblock_bad->header_error || |
| 1570 | sblock_bad->checksum_error || page_bad->io_error) { |
| 1571 | struct bio *bio; |
| 1572 | int ret; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1573 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1574 | if (!page_bad->dev->bdev) { |
David Sterba | 9464732 | 2015-10-08 11:01:36 +0200 | [diff] [blame] | 1575 | btrfs_warn_rl(sblock_bad->sctx->dev_root->fs_info, |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1576 | "scrub_repair_page_from_good_copy(bdev == NULL) " |
David Sterba | 9464732 | 2015-10-08 11:01:36 +0200 | [diff] [blame] | 1577 | "is unexpected"); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1578 | return -EIO; |
| 1579 | } |
| 1580 | |
Chris Mason | 9be3395 | 2013-05-17 18:30:14 -0400 | [diff] [blame] | 1581 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
Tsutomu Itoh | e627ee7 | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 1582 | if (!bio) |
| 1583 | return -EIO; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1584 | bio->bi_bdev = page_bad->dev->bdev; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1585 | bio->bi_iter.bi_sector = page_bad->physical >> 9; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1586 | |
| 1587 | ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0); |
| 1588 | if (PAGE_SIZE != ret) { |
| 1589 | bio_put(bio); |
| 1590 | return -EIO; |
| 1591 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1592 | |
Kent Overstreet | 33879d4 | 2013-11-23 22:33:32 -0800 | [diff] [blame] | 1593 | if (btrfsic_submit_bio_wait(WRITE, bio)) { |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1594 | btrfs_dev_stat_inc_and_print(page_bad->dev, |
| 1595 | BTRFS_DEV_STAT_WRITE_ERRS); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1596 | btrfs_dev_replace_stats_inc( |
| 1597 | &sblock_bad->sctx->dev_root->fs_info-> |
| 1598 | dev_replace.num_write_errors); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1599 | bio_put(bio); |
| 1600 | return -EIO; |
| 1601 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1602 | bio_put(bio); |
| 1603 | } |
| 1604 | |
| 1605 | return 0; |
| 1606 | } |
| 1607 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1608 | static void scrub_write_block_to_dev_replace(struct scrub_block *sblock) |
| 1609 | { |
| 1610 | int page_num; |
| 1611 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 1612 | /* |
| 1613 | * This block is used for the check of the parity on the source device, |
| 1614 | * so the data needn't be written into the destination device. |
| 1615 | */ |
| 1616 | if (sblock->sparity) |
| 1617 | return; |
| 1618 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1619 | for (page_num = 0; page_num < sblock->page_count; page_num++) { |
| 1620 | int ret; |
| 1621 | |
| 1622 | ret = scrub_write_page_to_dev_replace(sblock, page_num); |
| 1623 | if (ret) |
| 1624 | btrfs_dev_replace_stats_inc( |
| 1625 | &sblock->sctx->dev_root->fs_info->dev_replace. |
| 1626 | num_write_errors); |
| 1627 | } |
| 1628 | } |
| 1629 | |
| 1630 | static int scrub_write_page_to_dev_replace(struct scrub_block *sblock, |
| 1631 | int page_num) |
| 1632 | { |
| 1633 | struct scrub_page *spage = sblock->pagev[page_num]; |
| 1634 | |
| 1635 | BUG_ON(spage->page == NULL); |
| 1636 | if (spage->io_error) { |
| 1637 | void *mapped_buffer = kmap_atomic(spage->page); |
| 1638 | |
| 1639 | memset(mapped_buffer, 0, PAGE_CACHE_SIZE); |
| 1640 | flush_dcache_page(spage->page); |
| 1641 | kunmap_atomic(mapped_buffer); |
| 1642 | } |
| 1643 | return scrub_add_page_to_wr_bio(sblock->sctx, spage); |
| 1644 | } |
| 1645 | |
| 1646 | static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx, |
| 1647 | struct scrub_page *spage) |
| 1648 | { |
| 1649 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; |
| 1650 | struct scrub_bio *sbio; |
| 1651 | int ret; |
| 1652 | |
| 1653 | mutex_lock(&wr_ctx->wr_lock); |
| 1654 | again: |
| 1655 | if (!wr_ctx->wr_curr_bio) { |
| 1656 | wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio), |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 1657 | GFP_KERNEL); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1658 | if (!wr_ctx->wr_curr_bio) { |
| 1659 | mutex_unlock(&wr_ctx->wr_lock); |
| 1660 | return -ENOMEM; |
| 1661 | } |
| 1662 | wr_ctx->wr_curr_bio->sctx = sctx; |
| 1663 | wr_ctx->wr_curr_bio->page_count = 0; |
| 1664 | } |
| 1665 | sbio = wr_ctx->wr_curr_bio; |
| 1666 | if (sbio->page_count == 0) { |
| 1667 | struct bio *bio; |
| 1668 | |
| 1669 | sbio->physical = spage->physical_for_dev_replace; |
| 1670 | sbio->logical = spage->logical; |
| 1671 | sbio->dev = wr_ctx->tgtdev; |
| 1672 | bio = sbio->bio; |
| 1673 | if (!bio) { |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 1674 | bio = btrfs_io_bio_alloc(GFP_KERNEL, |
| 1675 | wr_ctx->pages_per_wr_bio); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1676 | if (!bio) { |
| 1677 | mutex_unlock(&wr_ctx->wr_lock); |
| 1678 | return -ENOMEM; |
| 1679 | } |
| 1680 | sbio->bio = bio; |
| 1681 | } |
| 1682 | |
| 1683 | bio->bi_private = sbio; |
| 1684 | bio->bi_end_io = scrub_wr_bio_end_io; |
| 1685 | bio->bi_bdev = sbio->dev->bdev; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1686 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1687 | sbio->err = 0; |
| 1688 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
| 1689 | spage->physical_for_dev_replace || |
| 1690 | sbio->logical + sbio->page_count * PAGE_SIZE != |
| 1691 | spage->logical) { |
| 1692 | scrub_wr_submit(sctx); |
| 1693 | goto again; |
| 1694 | } |
| 1695 | |
| 1696 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); |
| 1697 | if (ret != PAGE_SIZE) { |
| 1698 | if (sbio->page_count < 1) { |
| 1699 | bio_put(sbio->bio); |
| 1700 | sbio->bio = NULL; |
| 1701 | mutex_unlock(&wr_ctx->wr_lock); |
| 1702 | return -EIO; |
| 1703 | } |
| 1704 | scrub_wr_submit(sctx); |
| 1705 | goto again; |
| 1706 | } |
| 1707 | |
| 1708 | sbio->pagev[sbio->page_count] = spage; |
| 1709 | scrub_page_get(spage); |
| 1710 | sbio->page_count++; |
| 1711 | if (sbio->page_count == wr_ctx->pages_per_wr_bio) |
| 1712 | scrub_wr_submit(sctx); |
| 1713 | mutex_unlock(&wr_ctx->wr_lock); |
| 1714 | |
| 1715 | return 0; |
| 1716 | } |
| 1717 | |
| 1718 | static void scrub_wr_submit(struct scrub_ctx *sctx) |
| 1719 | { |
| 1720 | struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx; |
| 1721 | struct scrub_bio *sbio; |
| 1722 | |
| 1723 | if (!wr_ctx->wr_curr_bio) |
| 1724 | return; |
| 1725 | |
| 1726 | sbio = wr_ctx->wr_curr_bio; |
| 1727 | wr_ctx->wr_curr_bio = NULL; |
| 1728 | WARN_ON(!sbio->bio->bi_bdev); |
| 1729 | scrub_pending_bio_inc(sctx); |
| 1730 | /* process all writes in a single worker thread. Then the block layer |
| 1731 | * orders the requests before sending them to the driver which |
| 1732 | * doubled the write performance on spinning disks when measured |
| 1733 | * with Linux 3.5 */ |
| 1734 | btrfsic_submit_bio(WRITE, sbio->bio); |
| 1735 | } |
| 1736 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1737 | static void scrub_wr_bio_end_io(struct bio *bio) |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1738 | { |
| 1739 | struct scrub_bio *sbio = bio->bi_private; |
| 1740 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
| 1741 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1742 | sbio->err = bio->bi_error; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1743 | sbio->bio = bio; |
| 1744 | |
Liu Bo | 9e0af23 | 2014-08-15 23:36:53 +0800 | [diff] [blame] | 1745 | btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper, |
| 1746 | scrub_wr_bio_end_io_worker, NULL, NULL); |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 1747 | btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1748 | } |
| 1749 | |
| 1750 | static void scrub_wr_bio_end_io_worker(struct btrfs_work *work) |
| 1751 | { |
| 1752 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); |
| 1753 | struct scrub_ctx *sctx = sbio->sctx; |
| 1754 | int i; |
| 1755 | |
| 1756 | WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO); |
| 1757 | if (sbio->err) { |
| 1758 | struct btrfs_dev_replace *dev_replace = |
| 1759 | &sbio->sctx->dev_root->fs_info->dev_replace; |
| 1760 | |
| 1761 | for (i = 0; i < sbio->page_count; i++) { |
| 1762 | struct scrub_page *spage = sbio->pagev[i]; |
| 1763 | |
| 1764 | spage->io_error = 1; |
| 1765 | btrfs_dev_replace_stats_inc(&dev_replace-> |
| 1766 | num_write_errors); |
| 1767 | } |
| 1768 | } |
| 1769 | |
| 1770 | for (i = 0; i < sbio->page_count; i++) |
| 1771 | scrub_page_put(sbio->pagev[i]); |
| 1772 | |
| 1773 | bio_put(sbio->bio); |
| 1774 | kfree(sbio); |
| 1775 | scrub_pending_bio_dec(sctx); |
| 1776 | } |
| 1777 | |
| 1778 | static int scrub_checksum(struct scrub_block *sblock) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1779 | { |
| 1780 | u64 flags; |
| 1781 | int ret; |
| 1782 | |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1783 | /* |
| 1784 | * No need to initialize these stats currently, |
| 1785 | * because this function only use return value |
| 1786 | * instead of these stats value. |
| 1787 | * |
| 1788 | * Todo: |
| 1789 | * always use stats |
| 1790 | */ |
| 1791 | sblock->header_error = 0; |
| 1792 | sblock->generation_error = 0; |
| 1793 | sblock->checksum_error = 0; |
| 1794 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1795 | WARN_ON(sblock->page_count < 1); |
| 1796 | flags = sblock->pagev[0]->flags; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1797 | ret = 0; |
| 1798 | if (flags & BTRFS_EXTENT_FLAG_DATA) |
| 1799 | ret = scrub_checksum_data(sblock); |
| 1800 | else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) |
| 1801 | ret = scrub_checksum_tree_block(sblock); |
| 1802 | else if (flags & BTRFS_EXTENT_FLAG_SUPER) |
| 1803 | (void)scrub_checksum_super(sblock); |
| 1804 | else |
| 1805 | WARN_ON(1); |
| 1806 | if (ret) |
| 1807 | scrub_handle_errored_block(sblock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1808 | |
| 1809 | return ret; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1810 | } |
| 1811 | |
| 1812 | static int scrub_checksum_data(struct scrub_block *sblock) |
| 1813 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1814 | struct scrub_ctx *sctx = sblock->sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1815 | u8 csum[BTRFS_CSUM_SIZE]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1816 | u8 *on_disk_csum; |
| 1817 | struct page *page; |
| 1818 | void *buffer; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1819 | u32 crc = ~(u32)0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1820 | u64 len; |
| 1821 | int index; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1822 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1823 | BUG_ON(sblock->page_count < 1); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1824 | if (!sblock->pagev[0]->have_csum) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1825 | return 0; |
| 1826 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1827 | on_disk_csum = sblock->pagev[0]->csum; |
| 1828 | page = sblock->pagev[0]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1829 | buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1830 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1831 | len = sctx->sectorsize; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1832 | index = 0; |
| 1833 | for (;;) { |
| 1834 | u64 l = min_t(u64, len, PAGE_SIZE); |
| 1835 | |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 1836 | crc = btrfs_csum_data(buffer, crc, l); |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1837 | kunmap_atomic(buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1838 | len -= l; |
| 1839 | if (len == 0) |
| 1840 | break; |
| 1841 | index++; |
| 1842 | BUG_ON(index >= sblock->page_count); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1843 | BUG_ON(!sblock->pagev[index]->page); |
| 1844 | page = sblock->pagev[index]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1845 | buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1846 | } |
| 1847 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1848 | btrfs_csum_final(crc, csum); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1849 | if (memcmp(csum, on_disk_csum, sctx->csum_size)) |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1850 | sblock->checksum_error = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1851 | |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1852 | return sblock->checksum_error; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1853 | } |
| 1854 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1855 | static int scrub_checksum_tree_block(struct scrub_block *sblock) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1856 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1857 | struct scrub_ctx *sctx = sblock->sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1858 | struct btrfs_header *h; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 1859 | struct btrfs_root *root = sctx->dev_root; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1860 | struct btrfs_fs_info *fs_info = root->fs_info; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1861 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
| 1862 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; |
| 1863 | struct page *page; |
| 1864 | void *mapped_buffer; |
| 1865 | u64 mapped_size; |
| 1866 | void *p; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1867 | u32 crc = ~(u32)0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1868 | u64 len; |
| 1869 | int index; |
| 1870 | |
| 1871 | BUG_ON(sblock->page_count < 1); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1872 | page = sblock->pagev[0]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1873 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1874 | h = (struct btrfs_header *)mapped_buffer; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1875 | memcpy(on_disk_csum, h->csum, sctx->csum_size); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1876 | |
| 1877 | /* |
| 1878 | * we don't use the getter functions here, as we |
| 1879 | * a) don't have an extent buffer and |
| 1880 | * b) the page is already kmapped |
| 1881 | */ |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 1882 | if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h)) |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1883 | sblock->header_error = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1884 | |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1885 | if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h)) { |
| 1886 | sblock->header_error = 1; |
| 1887 | sblock->generation_error = 1; |
| 1888 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1889 | |
Miao Xie | 17a9be2 | 2014-07-24 11:37:08 +0800 | [diff] [blame] | 1890 | if (!scrub_check_fsid(h->fsid, sblock->pagev[0])) |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1891 | sblock->header_error = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1892 | |
| 1893 | if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid, |
| 1894 | BTRFS_UUID_SIZE)) |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1895 | sblock->header_error = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1896 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1897 | len = sctx->nodesize - BTRFS_CSUM_SIZE; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1898 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
| 1899 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; |
| 1900 | index = 0; |
| 1901 | for (;;) { |
| 1902 | u64 l = min_t(u64, len, mapped_size); |
| 1903 | |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 1904 | crc = btrfs_csum_data(p, crc, l); |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1905 | kunmap_atomic(mapped_buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1906 | len -= l; |
| 1907 | if (len == 0) |
| 1908 | break; |
| 1909 | index++; |
| 1910 | BUG_ON(index >= sblock->page_count); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1911 | BUG_ON(!sblock->pagev[index]->page); |
| 1912 | page = sblock->pagev[index]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1913 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1914 | mapped_size = PAGE_SIZE; |
| 1915 | p = mapped_buffer; |
| 1916 | } |
| 1917 | |
| 1918 | btrfs_csum_final(crc, calculated_csum); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1919 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1920 | sblock->checksum_error = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1921 | |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 1922 | return sblock->header_error || sblock->checksum_error; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1923 | } |
| 1924 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1925 | static int scrub_checksum_super(struct scrub_block *sblock) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1926 | { |
| 1927 | struct btrfs_super_block *s; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1928 | struct scrub_ctx *sctx = sblock->sctx; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1929 | u8 calculated_csum[BTRFS_CSUM_SIZE]; |
| 1930 | u8 on_disk_csum[BTRFS_CSUM_SIZE]; |
| 1931 | struct page *page; |
| 1932 | void *mapped_buffer; |
| 1933 | u64 mapped_size; |
| 1934 | void *p; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1935 | u32 crc = ~(u32)0; |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1936 | int fail_gen = 0; |
| 1937 | int fail_cor = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1938 | u64 len; |
| 1939 | int index; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1940 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1941 | BUG_ON(sblock->page_count < 1); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1942 | page = sblock->pagev[0]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1943 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1944 | s = (struct btrfs_super_block *)mapped_buffer; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1945 | memcpy(on_disk_csum, s->csum, sctx->csum_size); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1946 | |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 1947 | if (sblock->pagev[0]->logical != btrfs_super_bytenr(s)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1948 | ++fail_cor; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1949 | |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 1950 | if (sblock->pagev[0]->generation != btrfs_super_generation(s)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1951 | ++fail_gen; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1952 | |
Miao Xie | 17a9be2 | 2014-07-24 11:37:08 +0800 | [diff] [blame] | 1953 | if (!scrub_check_fsid(s->fsid, sblock->pagev[0])) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1954 | ++fail_cor; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1955 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1956 | len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE; |
| 1957 | mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE; |
| 1958 | p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE; |
| 1959 | index = 0; |
| 1960 | for (;;) { |
| 1961 | u64 l = min_t(u64, len, mapped_size); |
| 1962 | |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 1963 | crc = btrfs_csum_data(p, crc, l); |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1964 | kunmap_atomic(mapped_buffer); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1965 | len -= l; |
| 1966 | if (len == 0) |
| 1967 | break; |
| 1968 | index++; |
| 1969 | BUG_ON(index >= sblock->page_count); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1970 | BUG_ON(!sblock->pagev[index]->page); |
| 1971 | page = sblock->pagev[index]->page; |
Linus Torvalds | 9613beb | 2012-03-30 12:44:29 -0700 | [diff] [blame] | 1972 | mapped_buffer = kmap_atomic(page); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 1973 | mapped_size = PAGE_SIZE; |
| 1974 | p = mapped_buffer; |
| 1975 | } |
| 1976 | |
| 1977 | btrfs_csum_final(crc, calculated_csum); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1978 | if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size)) |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1979 | ++fail_cor; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1980 | |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1981 | if (fail_cor + fail_gen) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1982 | /* |
| 1983 | * if we find an error in a super block, we just report it. |
| 1984 | * They will get written with the next transaction commit |
| 1985 | * anyway |
| 1986 | */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 1987 | spin_lock(&sctx->stat_lock); |
| 1988 | ++sctx->stat.super_errors; |
| 1989 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1990 | if (fail_cor) |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1991 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1992 | BTRFS_DEV_STAT_CORRUPTION_ERRS); |
| 1993 | else |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 1994 | btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev, |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1995 | BTRFS_DEV_STAT_GENERATION_ERRS); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1996 | } |
| 1997 | |
Stefan Behrens | 442a4f6 | 2012-05-25 16:06:08 +0200 | [diff] [blame] | 1998 | return fail_cor + fail_gen; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1999 | } |
| 2000 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2001 | static void scrub_block_get(struct scrub_block *sblock) |
| 2002 | { |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 2003 | atomic_inc(&sblock->refs); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2004 | } |
| 2005 | |
| 2006 | static void scrub_block_put(struct scrub_block *sblock) |
| 2007 | { |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 2008 | if (atomic_dec_and_test(&sblock->refs)) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2009 | int i; |
| 2010 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2011 | if (sblock->sparity) |
| 2012 | scrub_parity_put(sblock->sparity); |
| 2013 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2014 | for (i = 0; i < sblock->page_count; i++) |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2015 | scrub_page_put(sblock->pagev[i]); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2016 | kfree(sblock); |
| 2017 | } |
| 2018 | } |
| 2019 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2020 | static void scrub_page_get(struct scrub_page *spage) |
| 2021 | { |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 2022 | atomic_inc(&spage->refs); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2023 | } |
| 2024 | |
| 2025 | static void scrub_page_put(struct scrub_page *spage) |
| 2026 | { |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 2027 | if (atomic_dec_and_test(&spage->refs)) { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2028 | if (spage->page) |
| 2029 | __free_page(spage->page); |
| 2030 | kfree(spage); |
| 2031 | } |
| 2032 | } |
| 2033 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2034 | static void scrub_submit(struct scrub_ctx *sctx) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2035 | { |
| 2036 | struct scrub_bio *sbio; |
| 2037 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2038 | if (sctx->curr == -1) |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 2039 | return; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2040 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2041 | sbio = sctx->bios[sctx->curr]; |
| 2042 | sctx->curr = -1; |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 2043 | scrub_pending_bio_inc(sctx); |
Omar Sandoval | 03679ad | 2015-06-19 11:52:48 -0700 | [diff] [blame] | 2044 | btrfsic_submit_bio(READ, sbio->bio); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2045 | } |
| 2046 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2047 | static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx, |
| 2048 | struct scrub_page *spage) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2049 | { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2050 | struct scrub_block *sblock = spage->sblock; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2051 | struct scrub_bio *sbio; |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 2052 | int ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2053 | |
| 2054 | again: |
| 2055 | /* |
| 2056 | * grab a fresh bio or wait for one to become available |
| 2057 | */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2058 | while (sctx->curr == -1) { |
| 2059 | spin_lock(&sctx->list_lock); |
| 2060 | sctx->curr = sctx->first_free; |
| 2061 | if (sctx->curr != -1) { |
| 2062 | sctx->first_free = sctx->bios[sctx->curr]->next_free; |
| 2063 | sctx->bios[sctx->curr]->next_free = -1; |
| 2064 | sctx->bios[sctx->curr]->page_count = 0; |
| 2065 | spin_unlock(&sctx->list_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2066 | } else { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2067 | spin_unlock(&sctx->list_lock); |
| 2068 | wait_event(sctx->list_wait, sctx->first_free != -1); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2069 | } |
| 2070 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2071 | sbio = sctx->bios[sctx->curr]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2072 | if (sbio->page_count == 0) { |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 2073 | struct bio *bio; |
| 2074 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2075 | sbio->physical = spage->physical; |
| 2076 | sbio->logical = spage->logical; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2077 | sbio->dev = spage->dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2078 | bio = sbio->bio; |
| 2079 | if (!bio) { |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 2080 | bio = btrfs_io_bio_alloc(GFP_KERNEL, |
| 2081 | sctx->pages_per_rd_bio); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2082 | if (!bio) |
| 2083 | return -ENOMEM; |
| 2084 | sbio->bio = bio; |
| 2085 | } |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 2086 | |
| 2087 | bio->bi_private = sbio; |
| 2088 | bio->bi_end_io = scrub_bio_end_io; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2089 | bio->bi_bdev = sbio->dev->bdev; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 2090 | bio->bi_iter.bi_sector = sbio->physical >> 9; |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 2091 | sbio->err = 0; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2092 | } else if (sbio->physical + sbio->page_count * PAGE_SIZE != |
| 2093 | spage->physical || |
| 2094 | sbio->logical + sbio->page_count * PAGE_SIZE != |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2095 | spage->logical || |
| 2096 | sbio->dev != spage->dev) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2097 | scrub_submit(sctx); |
Arne Jansen | 69f4cb5 | 2011-11-11 08:17:10 -0500 | [diff] [blame] | 2098 | goto again; |
| 2099 | } |
| 2100 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2101 | sbio->pagev[sbio->page_count] = spage; |
| 2102 | ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0); |
| 2103 | if (ret != PAGE_SIZE) { |
| 2104 | if (sbio->page_count < 1) { |
| 2105 | bio_put(sbio->bio); |
| 2106 | sbio->bio = NULL; |
| 2107 | return -EIO; |
| 2108 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2109 | scrub_submit(sctx); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2110 | goto again; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2111 | } |
Arne Jansen | 1bc8779 | 2011-05-28 21:57:55 +0200 | [diff] [blame] | 2112 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2113 | scrub_block_get(sblock); /* one for the page added to the bio */ |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2114 | atomic_inc(&sblock->outstanding_pages); |
| 2115 | sbio->page_count++; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2116 | if (sbio->page_count == sctx->pages_per_rd_bio) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2117 | scrub_submit(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2118 | |
| 2119 | return 0; |
| 2120 | } |
| 2121 | |
Linus Torvalds | 2236597 | 2015-09-05 15:14:43 -0700 | [diff] [blame] | 2122 | static void scrub_missing_raid56_end_io(struct bio *bio) |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2123 | { |
| 2124 | struct scrub_block *sblock = bio->bi_private; |
| 2125 | struct btrfs_fs_info *fs_info = sblock->sctx->dev_root->fs_info; |
| 2126 | |
Linus Torvalds | 2236597 | 2015-09-05 15:14:43 -0700 | [diff] [blame] | 2127 | if (bio->bi_error) |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2128 | sblock->no_io_error_seen = 0; |
| 2129 | |
| 2130 | btrfs_queue_work(fs_info->scrub_workers, &sblock->work); |
| 2131 | } |
| 2132 | |
| 2133 | static void scrub_missing_raid56_worker(struct btrfs_work *work) |
| 2134 | { |
| 2135 | struct scrub_block *sblock = container_of(work, struct scrub_block, work); |
| 2136 | struct scrub_ctx *sctx = sblock->sctx; |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2137 | u64 logical; |
| 2138 | struct btrfs_device *dev; |
| 2139 | |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2140 | logical = sblock->pagev[0]->logical; |
| 2141 | dev = sblock->pagev[0]->dev; |
| 2142 | |
Zhao Lei | affe4a5 | 2015-08-24 21:32:06 +0800 | [diff] [blame] | 2143 | if (sblock->no_io_error_seen) |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 2144 | scrub_recheck_block_checksum(sblock); |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2145 | |
| 2146 | if (!sblock->no_io_error_seen) { |
| 2147 | spin_lock(&sctx->stat_lock); |
| 2148 | sctx->stat.read_errors++; |
| 2149 | spin_unlock(&sctx->stat_lock); |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 2150 | btrfs_err_rl_in_rcu(sctx->dev_root->fs_info, |
David Sterba | b14af3b | 2015-10-08 10:43:10 +0200 | [diff] [blame] | 2151 | "IO error rebuilding logical %llu for dev %s", |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2152 | logical, rcu_str_deref(dev->name)); |
| 2153 | } else if (sblock->header_error || sblock->checksum_error) { |
| 2154 | spin_lock(&sctx->stat_lock); |
| 2155 | sctx->stat.uncorrectable_errors++; |
| 2156 | spin_unlock(&sctx->stat_lock); |
Zhao Lei | ba7cf98 | 2015-08-24 21:18:02 +0800 | [diff] [blame] | 2157 | btrfs_err_rl_in_rcu(sctx->dev_root->fs_info, |
David Sterba | b14af3b | 2015-10-08 10:43:10 +0200 | [diff] [blame] | 2158 | "failed to rebuild valid logical %llu for dev %s", |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2159 | logical, rcu_str_deref(dev->name)); |
| 2160 | } else { |
| 2161 | scrub_write_block_to_dev_replace(sblock); |
| 2162 | } |
| 2163 | |
| 2164 | scrub_block_put(sblock); |
| 2165 | |
| 2166 | if (sctx->is_dev_replace && |
| 2167 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { |
| 2168 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 2169 | scrub_wr_submit(sctx); |
| 2170 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
| 2171 | } |
| 2172 | |
| 2173 | scrub_pending_bio_dec(sctx); |
| 2174 | } |
| 2175 | |
| 2176 | static void scrub_missing_raid56_pages(struct scrub_block *sblock) |
| 2177 | { |
| 2178 | struct scrub_ctx *sctx = sblock->sctx; |
| 2179 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
| 2180 | u64 length = sblock->page_count * PAGE_SIZE; |
| 2181 | u64 logical = sblock->pagev[0]->logical; |
| 2182 | struct btrfs_bio *bbio; |
| 2183 | struct bio *bio; |
| 2184 | struct btrfs_raid_bio *rbio; |
| 2185 | int ret; |
| 2186 | int i; |
| 2187 | |
| 2188 | ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical, &length, |
| 2189 | &bbio, 0, 1); |
| 2190 | if (ret || !bbio || !bbio->raid_map) |
| 2191 | goto bbio_out; |
| 2192 | |
| 2193 | if (WARN_ON(!sctx->is_dev_replace || |
| 2194 | !(bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK))) { |
| 2195 | /* |
| 2196 | * We shouldn't be scrubbing a missing device. Even for dev |
| 2197 | * replace, we should only get here for RAID 5/6. We either |
| 2198 | * managed to mount something with no mirrors remaining or |
| 2199 | * there's a bug in scrub_remap_extent()/btrfs_map_block(). |
| 2200 | */ |
| 2201 | goto bbio_out; |
| 2202 | } |
| 2203 | |
| 2204 | bio = btrfs_io_bio_alloc(GFP_NOFS, 0); |
| 2205 | if (!bio) |
| 2206 | goto bbio_out; |
| 2207 | |
| 2208 | bio->bi_iter.bi_sector = logical >> 9; |
| 2209 | bio->bi_private = sblock; |
| 2210 | bio->bi_end_io = scrub_missing_raid56_end_io; |
| 2211 | |
| 2212 | rbio = raid56_alloc_missing_rbio(sctx->dev_root, bio, bbio, length); |
| 2213 | if (!rbio) |
| 2214 | goto rbio_out; |
| 2215 | |
| 2216 | for (i = 0; i < sblock->page_count; i++) { |
| 2217 | struct scrub_page *spage = sblock->pagev[i]; |
| 2218 | |
| 2219 | raid56_add_scrub_pages(rbio, spage->page, spage->logical); |
| 2220 | } |
| 2221 | |
| 2222 | btrfs_init_work(&sblock->work, btrfs_scrub_helper, |
| 2223 | scrub_missing_raid56_worker, NULL, NULL); |
| 2224 | scrub_block_get(sblock); |
| 2225 | scrub_pending_bio_inc(sctx); |
| 2226 | raid56_submit_missing_rbio(rbio); |
| 2227 | return; |
| 2228 | |
| 2229 | rbio_out: |
| 2230 | bio_put(bio); |
| 2231 | bbio_out: |
| 2232 | btrfs_put_bbio(bbio); |
| 2233 | spin_lock(&sctx->stat_lock); |
| 2234 | sctx->stat.malloc_errors++; |
| 2235 | spin_unlock(&sctx->stat_lock); |
| 2236 | } |
| 2237 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2238 | static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2239 | u64 physical, struct btrfs_device *dev, u64 flags, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2240 | u64 gen, int mirror_num, u8 *csum, int force, |
| 2241 | u64 physical_for_dev_replace) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2242 | { |
| 2243 | struct scrub_block *sblock; |
| 2244 | int index; |
| 2245 | |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 2246 | sblock = kzalloc(sizeof(*sblock), GFP_KERNEL); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2247 | if (!sblock) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2248 | spin_lock(&sctx->stat_lock); |
| 2249 | sctx->stat.malloc_errors++; |
| 2250 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2251 | return -ENOMEM; |
| 2252 | } |
| 2253 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2254 | /* one ref inside this function, plus one for each page added to |
| 2255 | * a bio later on */ |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 2256 | atomic_set(&sblock->refs, 1); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2257 | sblock->sctx = sctx; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2258 | sblock->no_io_error_seen = 1; |
| 2259 | |
| 2260 | for (index = 0; len > 0; index++) { |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2261 | struct scrub_page *spage; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2262 | u64 l = min_t(u64, len, PAGE_SIZE); |
| 2263 | |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 2264 | spage = kzalloc(sizeof(*spage), GFP_KERNEL); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2265 | if (!spage) { |
| 2266 | leave_nomem: |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2267 | spin_lock(&sctx->stat_lock); |
| 2268 | sctx->stat.malloc_errors++; |
| 2269 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2270 | scrub_block_put(sblock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2271 | return -ENOMEM; |
| 2272 | } |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2273 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
| 2274 | scrub_page_get(spage); |
| 2275 | sblock->pagev[index] = spage; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2276 | spage->sblock = sblock; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2277 | spage->dev = dev; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2278 | spage->flags = flags; |
| 2279 | spage->generation = gen; |
| 2280 | spage->logical = logical; |
| 2281 | spage->physical = physical; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2282 | spage->physical_for_dev_replace = physical_for_dev_replace; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2283 | spage->mirror_num = mirror_num; |
| 2284 | if (csum) { |
| 2285 | spage->have_csum = 1; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2286 | memcpy(spage->csum, csum, sctx->csum_size); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2287 | } else { |
| 2288 | spage->have_csum = 0; |
| 2289 | } |
| 2290 | sblock->page_count++; |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 2291 | spage->page = alloc_page(GFP_KERNEL); |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2292 | if (!spage->page) |
| 2293 | goto leave_nomem; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2294 | len -= l; |
| 2295 | logical += l; |
| 2296 | physical += l; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2297 | physical_for_dev_replace += l; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2298 | } |
| 2299 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 2300 | WARN_ON(sblock->page_count == 0); |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2301 | if (dev->missing) { |
| 2302 | /* |
| 2303 | * This case should only be hit for RAID 5/6 device replace. See |
| 2304 | * the comment in scrub_missing_raid56_pages() for details. |
| 2305 | */ |
| 2306 | scrub_missing_raid56_pages(sblock); |
| 2307 | } else { |
| 2308 | for (index = 0; index < sblock->page_count; index++) { |
| 2309 | struct scrub_page *spage = sblock->pagev[index]; |
| 2310 | int ret; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2311 | |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2312 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
| 2313 | if (ret) { |
| 2314 | scrub_block_put(sblock); |
| 2315 | return ret; |
| 2316 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2317 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2318 | |
Omar Sandoval | 73ff61d | 2015-06-19 11:52:51 -0700 | [diff] [blame] | 2319 | if (force) |
| 2320 | scrub_submit(sctx); |
| 2321 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2322 | |
| 2323 | /* last one frees, either here or in bio completion for last page */ |
| 2324 | scrub_block_put(sblock); |
| 2325 | return 0; |
| 2326 | } |
| 2327 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 2328 | static void scrub_bio_end_io(struct bio *bio) |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2329 | { |
| 2330 | struct scrub_bio *sbio = bio->bi_private; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2331 | struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2332 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 2333 | sbio->err = bio->bi_error; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2334 | sbio->bio = bio; |
| 2335 | |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 2336 | btrfs_queue_work(fs_info->scrub_workers, &sbio->work); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2337 | } |
| 2338 | |
| 2339 | static void scrub_bio_end_io_worker(struct btrfs_work *work) |
| 2340 | { |
| 2341 | struct scrub_bio *sbio = container_of(work, struct scrub_bio, work); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2342 | struct scrub_ctx *sctx = sbio->sctx; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2343 | int i; |
| 2344 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2345 | BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2346 | if (sbio->err) { |
| 2347 | for (i = 0; i < sbio->page_count; i++) { |
| 2348 | struct scrub_page *spage = sbio->pagev[i]; |
| 2349 | |
| 2350 | spage->io_error = 1; |
| 2351 | spage->sblock->no_io_error_seen = 0; |
| 2352 | } |
| 2353 | } |
| 2354 | |
| 2355 | /* now complete the scrub_block items that have all pages completed */ |
| 2356 | for (i = 0; i < sbio->page_count; i++) { |
| 2357 | struct scrub_page *spage = sbio->pagev[i]; |
| 2358 | struct scrub_block *sblock = spage->sblock; |
| 2359 | |
| 2360 | if (atomic_dec_and_test(&sblock->outstanding_pages)) |
| 2361 | scrub_block_complete(sblock); |
| 2362 | scrub_block_put(sblock); |
| 2363 | } |
| 2364 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2365 | bio_put(sbio->bio); |
| 2366 | sbio->bio = NULL; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2367 | spin_lock(&sctx->list_lock); |
| 2368 | sbio->next_free = sctx->first_free; |
| 2369 | sctx->first_free = sbio->index; |
| 2370 | spin_unlock(&sctx->list_lock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2371 | |
| 2372 | if (sctx->is_dev_replace && |
| 2373 | atomic_read(&sctx->wr_ctx.flush_all_writes)) { |
| 2374 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 2375 | scrub_wr_submit(sctx); |
| 2376 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
| 2377 | } |
| 2378 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 2379 | scrub_pending_bio_dec(sctx); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2380 | } |
| 2381 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2382 | static inline void __scrub_mark_bitmap(struct scrub_parity *sparity, |
| 2383 | unsigned long *bitmap, |
| 2384 | u64 start, u64 len) |
| 2385 | { |
David Sterba | 9d644a6 | 2015-02-20 18:42:11 +0100 | [diff] [blame] | 2386 | u32 offset; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2387 | int nsectors; |
| 2388 | int sectorsize = sparity->sctx->dev_root->sectorsize; |
| 2389 | |
| 2390 | if (len >= sparity->stripe_len) { |
| 2391 | bitmap_set(bitmap, 0, sparity->nsectors); |
| 2392 | return; |
| 2393 | } |
| 2394 | |
| 2395 | start -= sparity->logic_start; |
David Sterba | 47c5713 | 2015-02-20 18:43:47 +0100 | [diff] [blame] | 2396 | start = div_u64_rem(start, sparity->stripe_len, &offset); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2397 | offset /= sectorsize; |
| 2398 | nsectors = (int)len / sectorsize; |
| 2399 | |
| 2400 | if (offset + nsectors <= sparity->nsectors) { |
| 2401 | bitmap_set(bitmap, offset, nsectors); |
| 2402 | return; |
| 2403 | } |
| 2404 | |
| 2405 | bitmap_set(bitmap, offset, sparity->nsectors - offset); |
| 2406 | bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset)); |
| 2407 | } |
| 2408 | |
| 2409 | static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity, |
| 2410 | u64 start, u64 len) |
| 2411 | { |
| 2412 | __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len); |
| 2413 | } |
| 2414 | |
| 2415 | static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity, |
| 2416 | u64 start, u64 len) |
| 2417 | { |
| 2418 | __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len); |
| 2419 | } |
| 2420 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2421 | static void scrub_block_complete(struct scrub_block *sblock) |
| 2422 | { |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2423 | int corrupted = 0; |
| 2424 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2425 | if (!sblock->no_io_error_seen) { |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2426 | corrupted = 1; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2427 | scrub_handle_errored_block(sblock); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2428 | } else { |
| 2429 | /* |
| 2430 | * if has checksum error, write via repair mechanism in |
| 2431 | * dev replace case, otherwise write here in dev replace |
| 2432 | * case. |
| 2433 | */ |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2434 | corrupted = scrub_checksum(sblock); |
| 2435 | if (!corrupted && sblock->sctx->is_dev_replace) |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2436 | scrub_write_block_to_dev_replace(sblock); |
| 2437 | } |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2438 | |
| 2439 | if (sblock->sparity && corrupted && !sblock->data_corrected) { |
| 2440 | u64 start = sblock->pagev[0]->logical; |
| 2441 | u64 end = sblock->pagev[sblock->page_count - 1]->logical + |
| 2442 | PAGE_SIZE; |
| 2443 | |
| 2444 | scrub_parity_mark_sectors_error(sblock->sparity, |
| 2445 | start, end - start); |
| 2446 | } |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2447 | } |
| 2448 | |
Zhao Lei | 3b5753e | 2015-08-24 22:03:02 +0800 | [diff] [blame] | 2449 | static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2450 | { |
| 2451 | struct btrfs_ordered_sum *sum = NULL; |
Miao Xie | f51a4a1 | 2013-06-19 10:36:09 +0800 | [diff] [blame] | 2452 | unsigned long index; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2453 | unsigned long num_sectors; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2454 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2455 | while (!list_empty(&sctx->csum_list)) { |
| 2456 | sum = list_first_entry(&sctx->csum_list, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2457 | struct btrfs_ordered_sum, list); |
| 2458 | if (sum->bytenr > logical) |
| 2459 | return 0; |
| 2460 | if (sum->bytenr + sum->len > logical) |
| 2461 | break; |
| 2462 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2463 | ++sctx->stat.csum_discards; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2464 | list_del(&sum->list); |
| 2465 | kfree(sum); |
| 2466 | sum = NULL; |
| 2467 | } |
| 2468 | if (!sum) |
| 2469 | return 0; |
| 2470 | |
Miao Xie | f51a4a1 | 2013-06-19 10:36:09 +0800 | [diff] [blame] | 2471 | index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2472 | num_sectors = sum->len / sctx->sectorsize; |
Miao Xie | f51a4a1 | 2013-06-19 10:36:09 +0800 | [diff] [blame] | 2473 | memcpy(csum, sum->sums + index, sctx->csum_size); |
| 2474 | if (index == num_sectors - 1) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2475 | list_del(&sum->list); |
| 2476 | kfree(sum); |
| 2477 | } |
Miao Xie | f51a4a1 | 2013-06-19 10:36:09 +0800 | [diff] [blame] | 2478 | return 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2479 | } |
| 2480 | |
| 2481 | /* scrub extent tries to collect up to 64 kB for each bio */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2482 | static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2483 | u64 physical, struct btrfs_device *dev, u64 flags, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2484 | u64 gen, int mirror_num, u64 physical_for_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2485 | { |
| 2486 | int ret; |
| 2487 | u8 csum[BTRFS_CSUM_SIZE]; |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2488 | u32 blocksize; |
| 2489 | |
| 2490 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2491 | blocksize = sctx->sectorsize; |
| 2492 | spin_lock(&sctx->stat_lock); |
| 2493 | sctx->stat.data_extents_scrubbed++; |
| 2494 | sctx->stat.data_bytes_scrubbed += len; |
| 2495 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2496 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2497 | blocksize = sctx->nodesize; |
| 2498 | spin_lock(&sctx->stat_lock); |
| 2499 | sctx->stat.tree_extents_scrubbed++; |
| 2500 | sctx->stat.tree_bytes_scrubbed += len; |
| 2501 | spin_unlock(&sctx->stat_lock); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2502 | } else { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2503 | blocksize = sctx->sectorsize; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2504 | WARN_ON(1); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2505 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2506 | |
| 2507 | while (len) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 2508 | u64 l = min_t(u64, len, blocksize); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2509 | int have_csum = 0; |
| 2510 | |
| 2511 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
| 2512 | /* push csums to sbio */ |
Zhao Lei | 3b5753e | 2015-08-24 22:03:02 +0800 | [diff] [blame] | 2513 | have_csum = scrub_find_csum(sctx, logical, csum); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2514 | if (have_csum == 0) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 2515 | ++sctx->stat.no_csum; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2516 | if (sctx->is_dev_replace && !have_csum) { |
| 2517 | ret = copy_nocow_pages(sctx, logical, l, |
| 2518 | mirror_num, |
| 2519 | physical_for_dev_replace); |
| 2520 | goto behind_scrub_pages; |
| 2521 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2522 | } |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 2523 | ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2524 | mirror_num, have_csum ? csum : NULL, 0, |
| 2525 | physical_for_dev_replace); |
| 2526 | behind_scrub_pages: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2527 | if (ret) |
| 2528 | return ret; |
| 2529 | len -= l; |
| 2530 | logical += l; |
| 2531 | physical += l; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 2532 | physical_for_dev_replace += l; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2533 | } |
| 2534 | return 0; |
| 2535 | } |
| 2536 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2537 | static int scrub_pages_for_parity(struct scrub_parity *sparity, |
| 2538 | u64 logical, u64 len, |
| 2539 | u64 physical, struct btrfs_device *dev, |
| 2540 | u64 flags, u64 gen, int mirror_num, u8 *csum) |
| 2541 | { |
| 2542 | struct scrub_ctx *sctx = sparity->sctx; |
| 2543 | struct scrub_block *sblock; |
| 2544 | int index; |
| 2545 | |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 2546 | sblock = kzalloc(sizeof(*sblock), GFP_KERNEL); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2547 | if (!sblock) { |
| 2548 | spin_lock(&sctx->stat_lock); |
| 2549 | sctx->stat.malloc_errors++; |
| 2550 | spin_unlock(&sctx->stat_lock); |
| 2551 | return -ENOMEM; |
| 2552 | } |
| 2553 | |
| 2554 | /* one ref inside this function, plus one for each page added to |
| 2555 | * a bio later on */ |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 2556 | atomic_set(&sblock->refs, 1); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2557 | sblock->sctx = sctx; |
| 2558 | sblock->no_io_error_seen = 1; |
| 2559 | sblock->sparity = sparity; |
| 2560 | scrub_parity_get(sparity); |
| 2561 | |
| 2562 | for (index = 0; len > 0; index++) { |
| 2563 | struct scrub_page *spage; |
| 2564 | u64 l = min_t(u64, len, PAGE_SIZE); |
| 2565 | |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 2566 | spage = kzalloc(sizeof(*spage), GFP_KERNEL); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2567 | if (!spage) { |
| 2568 | leave_nomem: |
| 2569 | spin_lock(&sctx->stat_lock); |
| 2570 | sctx->stat.malloc_errors++; |
| 2571 | spin_unlock(&sctx->stat_lock); |
| 2572 | scrub_block_put(sblock); |
| 2573 | return -ENOMEM; |
| 2574 | } |
| 2575 | BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK); |
| 2576 | /* For scrub block */ |
| 2577 | scrub_page_get(spage); |
| 2578 | sblock->pagev[index] = spage; |
| 2579 | /* For scrub parity */ |
| 2580 | scrub_page_get(spage); |
| 2581 | list_add_tail(&spage->list, &sparity->spages); |
| 2582 | spage->sblock = sblock; |
| 2583 | spage->dev = dev; |
| 2584 | spage->flags = flags; |
| 2585 | spage->generation = gen; |
| 2586 | spage->logical = logical; |
| 2587 | spage->physical = physical; |
| 2588 | spage->mirror_num = mirror_num; |
| 2589 | if (csum) { |
| 2590 | spage->have_csum = 1; |
| 2591 | memcpy(spage->csum, csum, sctx->csum_size); |
| 2592 | } else { |
| 2593 | spage->have_csum = 0; |
| 2594 | } |
| 2595 | sblock->page_count++; |
David Sterba | 58c4e17 | 2016-02-11 10:49:42 +0100 | [diff] [blame] | 2596 | spage->page = alloc_page(GFP_KERNEL); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2597 | if (!spage->page) |
| 2598 | goto leave_nomem; |
| 2599 | len -= l; |
| 2600 | logical += l; |
| 2601 | physical += l; |
| 2602 | } |
| 2603 | |
| 2604 | WARN_ON(sblock->page_count == 0); |
| 2605 | for (index = 0; index < sblock->page_count; index++) { |
| 2606 | struct scrub_page *spage = sblock->pagev[index]; |
| 2607 | int ret; |
| 2608 | |
| 2609 | ret = scrub_add_page_to_rd_bio(sctx, spage); |
| 2610 | if (ret) { |
| 2611 | scrub_block_put(sblock); |
| 2612 | return ret; |
| 2613 | } |
| 2614 | } |
| 2615 | |
| 2616 | /* last one frees, either here or in bio completion for last page */ |
| 2617 | scrub_block_put(sblock); |
| 2618 | return 0; |
| 2619 | } |
| 2620 | |
| 2621 | static int scrub_extent_for_parity(struct scrub_parity *sparity, |
| 2622 | u64 logical, u64 len, |
| 2623 | u64 physical, struct btrfs_device *dev, |
| 2624 | u64 flags, u64 gen, int mirror_num) |
| 2625 | { |
| 2626 | struct scrub_ctx *sctx = sparity->sctx; |
| 2627 | int ret; |
| 2628 | u8 csum[BTRFS_CSUM_SIZE]; |
| 2629 | u32 blocksize; |
| 2630 | |
Omar Sandoval | 4a77089 | 2015-06-19 11:52:52 -0700 | [diff] [blame] | 2631 | if (dev->missing) { |
| 2632 | scrub_parity_mark_sectors_error(sparity, logical, len); |
| 2633 | return 0; |
| 2634 | } |
| 2635 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2636 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
| 2637 | blocksize = sctx->sectorsize; |
| 2638 | } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
| 2639 | blocksize = sctx->nodesize; |
| 2640 | } else { |
| 2641 | blocksize = sctx->sectorsize; |
| 2642 | WARN_ON(1); |
| 2643 | } |
| 2644 | |
| 2645 | while (len) { |
| 2646 | u64 l = min_t(u64, len, blocksize); |
| 2647 | int have_csum = 0; |
| 2648 | |
| 2649 | if (flags & BTRFS_EXTENT_FLAG_DATA) { |
| 2650 | /* push csums to sbio */ |
Zhao Lei | 3b5753e | 2015-08-24 22:03:02 +0800 | [diff] [blame] | 2651 | have_csum = scrub_find_csum(sctx, logical, csum); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2652 | if (have_csum == 0) |
| 2653 | goto skip; |
| 2654 | } |
| 2655 | ret = scrub_pages_for_parity(sparity, logical, l, physical, dev, |
| 2656 | flags, gen, mirror_num, |
| 2657 | have_csum ? csum : NULL); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2658 | if (ret) |
| 2659 | return ret; |
Dan Carpenter | 6b6d24b | 2014-12-12 22:30:00 +0300 | [diff] [blame] | 2660 | skip: |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2661 | len -= l; |
| 2662 | logical += l; |
| 2663 | physical += l; |
| 2664 | } |
| 2665 | return 0; |
| 2666 | } |
| 2667 | |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 2668 | /* |
| 2669 | * Given a physical address, this will calculate it's |
| 2670 | * logical offset. if this is a parity stripe, it will return |
| 2671 | * the most left data stripe's logical offset. |
| 2672 | * |
| 2673 | * return 0 if it is a data stripe, 1 means parity stripe. |
| 2674 | */ |
| 2675 | static int get_raid56_logic_offset(u64 physical, int num, |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2676 | struct map_lookup *map, u64 *offset, |
| 2677 | u64 *stripe_start) |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 2678 | { |
| 2679 | int i; |
| 2680 | int j = 0; |
| 2681 | u64 stripe_nr; |
| 2682 | u64 last_offset; |
David Sterba | 9d644a6 | 2015-02-20 18:42:11 +0100 | [diff] [blame] | 2683 | u32 stripe_index; |
| 2684 | u32 rot; |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 2685 | |
| 2686 | last_offset = (physical - map->stripes[num].physical) * |
| 2687 | nr_data_stripes(map); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2688 | if (stripe_start) |
| 2689 | *stripe_start = last_offset; |
| 2690 | |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 2691 | *offset = last_offset; |
| 2692 | for (i = 0; i < nr_data_stripes(map); i++) { |
| 2693 | *offset = last_offset + i * map->stripe_len; |
| 2694 | |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 2695 | stripe_nr = div_u64(*offset, map->stripe_len); |
| 2696 | stripe_nr = div_u64(stripe_nr, nr_data_stripes(map)); |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 2697 | |
| 2698 | /* Work out the disk rotation on this stripe-set */ |
David Sterba | 47c5713 | 2015-02-20 18:43:47 +0100 | [diff] [blame] | 2699 | stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot); |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 2700 | /* calculate which stripe this data locates */ |
| 2701 | rot += i; |
Wang Shilong | e4fbaee | 2014-04-11 18:32:25 +0800 | [diff] [blame] | 2702 | stripe_index = rot % map->num_stripes; |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 2703 | if (stripe_index == num) |
| 2704 | return 0; |
| 2705 | if (stripe_index < num) |
| 2706 | j++; |
| 2707 | } |
| 2708 | *offset = last_offset + j * map->stripe_len; |
| 2709 | return 1; |
| 2710 | } |
| 2711 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2712 | static void scrub_free_parity(struct scrub_parity *sparity) |
| 2713 | { |
| 2714 | struct scrub_ctx *sctx = sparity->sctx; |
| 2715 | struct scrub_page *curr, *next; |
| 2716 | int nbits; |
| 2717 | |
| 2718 | nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors); |
| 2719 | if (nbits) { |
| 2720 | spin_lock(&sctx->stat_lock); |
| 2721 | sctx->stat.read_errors += nbits; |
| 2722 | sctx->stat.uncorrectable_errors += nbits; |
| 2723 | spin_unlock(&sctx->stat_lock); |
| 2724 | } |
| 2725 | |
| 2726 | list_for_each_entry_safe(curr, next, &sparity->spages, list) { |
| 2727 | list_del_init(&curr->list); |
| 2728 | scrub_page_put(curr); |
| 2729 | } |
| 2730 | |
| 2731 | kfree(sparity); |
| 2732 | } |
| 2733 | |
Zhao Lei | 20b2e30 | 2015-06-04 20:09:15 +0800 | [diff] [blame] | 2734 | static void scrub_parity_bio_endio_worker(struct btrfs_work *work) |
| 2735 | { |
| 2736 | struct scrub_parity *sparity = container_of(work, struct scrub_parity, |
| 2737 | work); |
| 2738 | struct scrub_ctx *sctx = sparity->sctx; |
| 2739 | |
| 2740 | scrub_free_parity(sparity); |
| 2741 | scrub_pending_bio_dec(sctx); |
| 2742 | } |
| 2743 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 2744 | static void scrub_parity_bio_endio(struct bio *bio) |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2745 | { |
| 2746 | struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2747 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 2748 | if (bio->bi_error) |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2749 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
| 2750 | sparity->nsectors); |
| 2751 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2752 | bio_put(bio); |
Zhao Lei | 20b2e30 | 2015-06-04 20:09:15 +0800 | [diff] [blame] | 2753 | |
| 2754 | btrfs_init_work(&sparity->work, btrfs_scrubparity_helper, |
| 2755 | scrub_parity_bio_endio_worker, NULL, NULL); |
| 2756 | btrfs_queue_work(sparity->sctx->dev_root->fs_info->scrub_parity_workers, |
| 2757 | &sparity->work); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2758 | } |
| 2759 | |
| 2760 | static void scrub_parity_check_and_repair(struct scrub_parity *sparity) |
| 2761 | { |
| 2762 | struct scrub_ctx *sctx = sparity->sctx; |
| 2763 | struct bio *bio; |
| 2764 | struct btrfs_raid_bio *rbio; |
| 2765 | struct scrub_page *spage; |
| 2766 | struct btrfs_bio *bbio = NULL; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2767 | u64 length; |
| 2768 | int ret; |
| 2769 | |
| 2770 | if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap, |
| 2771 | sparity->nsectors)) |
| 2772 | goto out; |
| 2773 | |
Zhao Lei | a0dd59d | 2015-07-21 15:42:26 +0800 | [diff] [blame] | 2774 | length = sparity->logic_end - sparity->logic_start; |
Miao Xie | 7603597 | 2014-11-14 17:45:42 +0800 | [diff] [blame] | 2775 | ret = btrfs_map_sblock(sctx->dev_root->fs_info, WRITE, |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2776 | sparity->logic_start, |
Zhao Lei | 8e5cfb5 | 2015-01-20 15:11:33 +0800 | [diff] [blame] | 2777 | &length, &bbio, 0, 1); |
| 2778 | if (ret || !bbio || !bbio->raid_map) |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2779 | goto bbio_out; |
| 2780 | |
| 2781 | bio = btrfs_io_bio_alloc(GFP_NOFS, 0); |
| 2782 | if (!bio) |
| 2783 | goto bbio_out; |
| 2784 | |
| 2785 | bio->bi_iter.bi_sector = sparity->logic_start >> 9; |
| 2786 | bio->bi_private = sparity; |
| 2787 | bio->bi_end_io = scrub_parity_bio_endio; |
| 2788 | |
| 2789 | rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio, |
Zhao Lei | 8e5cfb5 | 2015-01-20 15:11:33 +0800 | [diff] [blame] | 2790 | length, sparity->scrub_dev, |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2791 | sparity->dbitmap, |
| 2792 | sparity->nsectors); |
| 2793 | if (!rbio) |
| 2794 | goto rbio_out; |
| 2795 | |
| 2796 | list_for_each_entry(spage, &sparity->spages, list) |
Omar Sandoval | b4ee178 | 2015-06-19 11:52:50 -0700 | [diff] [blame] | 2797 | raid56_add_scrub_pages(rbio, spage->page, spage->logical); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2798 | |
| 2799 | scrub_pending_bio_inc(sctx); |
| 2800 | raid56_parity_submit_scrub_rbio(rbio); |
| 2801 | return; |
| 2802 | |
| 2803 | rbio_out: |
| 2804 | bio_put(bio); |
| 2805 | bbio_out: |
Zhao Lei | 6e9606d | 2015-01-20 15:11:34 +0800 | [diff] [blame] | 2806 | btrfs_put_bbio(bbio); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2807 | bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap, |
| 2808 | sparity->nsectors); |
| 2809 | spin_lock(&sctx->stat_lock); |
| 2810 | sctx->stat.malloc_errors++; |
| 2811 | spin_unlock(&sctx->stat_lock); |
| 2812 | out: |
| 2813 | scrub_free_parity(sparity); |
| 2814 | } |
| 2815 | |
| 2816 | static inline int scrub_calc_parity_bitmap_len(int nsectors) |
| 2817 | { |
Zhao Lei | bfca9a6 | 2014-12-08 19:55:57 +0800 | [diff] [blame] | 2818 | return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * sizeof(long); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2819 | } |
| 2820 | |
| 2821 | static void scrub_parity_get(struct scrub_parity *sparity) |
| 2822 | { |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 2823 | atomic_inc(&sparity->refs); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2824 | } |
| 2825 | |
| 2826 | static void scrub_parity_put(struct scrub_parity *sparity) |
| 2827 | { |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 2828 | if (!atomic_dec_and_test(&sparity->refs)) |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2829 | return; |
| 2830 | |
| 2831 | scrub_parity_check_and_repair(sparity); |
| 2832 | } |
| 2833 | |
| 2834 | static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx, |
| 2835 | struct map_lookup *map, |
| 2836 | struct btrfs_device *sdev, |
| 2837 | struct btrfs_path *path, |
| 2838 | u64 logic_start, |
| 2839 | u64 logic_end) |
| 2840 | { |
| 2841 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
| 2842 | struct btrfs_root *root = fs_info->extent_root; |
| 2843 | struct btrfs_root *csum_root = fs_info->csum_root; |
| 2844 | struct btrfs_extent_item *extent; |
Omar Sandoval | 4a77089 | 2015-06-19 11:52:52 -0700 | [diff] [blame] | 2845 | struct btrfs_bio *bbio = NULL; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2846 | u64 flags; |
| 2847 | int ret; |
| 2848 | int slot; |
| 2849 | struct extent_buffer *l; |
| 2850 | struct btrfs_key key; |
| 2851 | u64 generation; |
| 2852 | u64 extent_logical; |
| 2853 | u64 extent_physical; |
| 2854 | u64 extent_len; |
Omar Sandoval | 4a77089 | 2015-06-19 11:52:52 -0700 | [diff] [blame] | 2855 | u64 mapped_length; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2856 | struct btrfs_device *extent_dev; |
| 2857 | struct scrub_parity *sparity; |
| 2858 | int nsectors; |
| 2859 | int bitmap_len; |
| 2860 | int extent_mirror_num; |
| 2861 | int stop_loop = 0; |
| 2862 | |
| 2863 | nsectors = map->stripe_len / root->sectorsize; |
| 2864 | bitmap_len = scrub_calc_parity_bitmap_len(nsectors); |
| 2865 | sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len, |
| 2866 | GFP_NOFS); |
| 2867 | if (!sparity) { |
| 2868 | spin_lock(&sctx->stat_lock); |
| 2869 | sctx->stat.malloc_errors++; |
| 2870 | spin_unlock(&sctx->stat_lock); |
| 2871 | return -ENOMEM; |
| 2872 | } |
| 2873 | |
| 2874 | sparity->stripe_len = map->stripe_len; |
| 2875 | sparity->nsectors = nsectors; |
| 2876 | sparity->sctx = sctx; |
| 2877 | sparity->scrub_dev = sdev; |
| 2878 | sparity->logic_start = logic_start; |
| 2879 | sparity->logic_end = logic_end; |
Zhao Lei | 5701934 | 2015-01-20 15:11:45 +0800 | [diff] [blame] | 2880 | atomic_set(&sparity->refs, 1); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2881 | INIT_LIST_HEAD(&sparity->spages); |
| 2882 | sparity->dbitmap = sparity->bitmap; |
| 2883 | sparity->ebitmap = (void *)sparity->bitmap + bitmap_len; |
| 2884 | |
| 2885 | ret = 0; |
| 2886 | while (logic_start < logic_end) { |
| 2887 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
| 2888 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 2889 | else |
| 2890 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 2891 | key.objectid = logic_start; |
| 2892 | key.offset = (u64)-1; |
| 2893 | |
| 2894 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 2895 | if (ret < 0) |
| 2896 | goto out; |
| 2897 | |
| 2898 | if (ret > 0) { |
| 2899 | ret = btrfs_previous_extent_item(root, path, 0); |
| 2900 | if (ret < 0) |
| 2901 | goto out; |
| 2902 | if (ret > 0) { |
| 2903 | btrfs_release_path(path); |
| 2904 | ret = btrfs_search_slot(NULL, root, &key, |
| 2905 | path, 0, 0); |
| 2906 | if (ret < 0) |
| 2907 | goto out; |
| 2908 | } |
| 2909 | } |
| 2910 | |
| 2911 | stop_loop = 0; |
| 2912 | while (1) { |
| 2913 | u64 bytes; |
| 2914 | |
| 2915 | l = path->nodes[0]; |
| 2916 | slot = path->slots[0]; |
| 2917 | if (slot >= btrfs_header_nritems(l)) { |
| 2918 | ret = btrfs_next_leaf(root, path); |
| 2919 | if (ret == 0) |
| 2920 | continue; |
| 2921 | if (ret < 0) |
| 2922 | goto out; |
| 2923 | |
| 2924 | stop_loop = 1; |
| 2925 | break; |
| 2926 | } |
| 2927 | btrfs_item_key_to_cpu(l, &key, slot); |
| 2928 | |
Zhao Lei | d7cad23 | 2015-07-22 13:14:48 +0800 | [diff] [blame] | 2929 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
| 2930 | key.type != BTRFS_METADATA_ITEM_KEY) |
| 2931 | goto next; |
| 2932 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2933 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
| 2934 | bytes = root->nodesize; |
| 2935 | else |
| 2936 | bytes = key.offset; |
| 2937 | |
| 2938 | if (key.objectid + bytes <= logic_start) |
| 2939 | goto next; |
| 2940 | |
Zhao Lei | a0dd59d | 2015-07-21 15:42:26 +0800 | [diff] [blame] | 2941 | if (key.objectid >= logic_end) { |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2942 | stop_loop = 1; |
| 2943 | break; |
| 2944 | } |
| 2945 | |
| 2946 | while (key.objectid >= logic_start + map->stripe_len) |
| 2947 | logic_start += map->stripe_len; |
| 2948 | |
| 2949 | extent = btrfs_item_ptr(l, slot, |
| 2950 | struct btrfs_extent_item); |
| 2951 | flags = btrfs_extent_flags(l, extent); |
| 2952 | generation = btrfs_extent_generation(l, extent); |
| 2953 | |
Zhao Lei | a323e81 | 2015-07-23 12:29:49 +0800 | [diff] [blame] | 2954 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
| 2955 | (key.objectid < logic_start || |
| 2956 | key.objectid + bytes > |
| 2957 | logic_start + map->stripe_len)) { |
| 2958 | btrfs_err(fs_info, "scrub: tree block %llu spanning stripes, ignored. logical=%llu", |
| 2959 | key.objectid, logic_start); |
Zhao Lei | 9799d2c | 2015-08-25 21:31:40 +0800 | [diff] [blame] | 2960 | spin_lock(&sctx->stat_lock); |
| 2961 | sctx->stat.uncorrectable_errors++; |
| 2962 | spin_unlock(&sctx->stat_lock); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2963 | goto next; |
| 2964 | } |
| 2965 | again: |
| 2966 | extent_logical = key.objectid; |
| 2967 | extent_len = bytes; |
| 2968 | |
| 2969 | if (extent_logical < logic_start) { |
| 2970 | extent_len -= logic_start - extent_logical; |
| 2971 | extent_logical = logic_start; |
| 2972 | } |
| 2973 | |
| 2974 | if (extent_logical + extent_len > |
| 2975 | logic_start + map->stripe_len) |
| 2976 | extent_len = logic_start + map->stripe_len - |
| 2977 | extent_logical; |
| 2978 | |
| 2979 | scrub_parity_mark_sectors_data(sparity, extent_logical, |
| 2980 | extent_len); |
| 2981 | |
Omar Sandoval | 4a77089 | 2015-06-19 11:52:52 -0700 | [diff] [blame] | 2982 | mapped_length = extent_len; |
| 2983 | ret = btrfs_map_block(fs_info, READ, extent_logical, |
| 2984 | &mapped_length, &bbio, 0); |
| 2985 | if (!ret) { |
| 2986 | if (!bbio || mapped_length < extent_len) |
| 2987 | ret = -EIO; |
| 2988 | } |
| 2989 | if (ret) { |
| 2990 | btrfs_put_bbio(bbio); |
| 2991 | goto out; |
| 2992 | } |
| 2993 | extent_physical = bbio->stripes[0].physical; |
| 2994 | extent_mirror_num = bbio->mirror_num; |
| 2995 | extent_dev = bbio->stripes[0].dev; |
| 2996 | btrfs_put_bbio(bbio); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 2997 | |
| 2998 | ret = btrfs_lookup_csums_range(csum_root, |
| 2999 | extent_logical, |
| 3000 | extent_logical + extent_len - 1, |
| 3001 | &sctx->csum_list, 1); |
| 3002 | if (ret) |
| 3003 | goto out; |
| 3004 | |
| 3005 | ret = scrub_extent_for_parity(sparity, extent_logical, |
| 3006 | extent_len, |
| 3007 | extent_physical, |
| 3008 | extent_dev, flags, |
| 3009 | generation, |
| 3010 | extent_mirror_num); |
Zhao Lei | 6fa96d7 | 2015-07-21 12:22:30 +0800 | [diff] [blame] | 3011 | |
| 3012 | scrub_free_csums(sctx); |
| 3013 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3014 | if (ret) |
| 3015 | goto out; |
| 3016 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3017 | if (extent_logical + extent_len < |
| 3018 | key.objectid + bytes) { |
| 3019 | logic_start += map->stripe_len; |
| 3020 | |
| 3021 | if (logic_start >= logic_end) { |
| 3022 | stop_loop = 1; |
| 3023 | break; |
| 3024 | } |
| 3025 | |
| 3026 | if (logic_start < key.objectid + bytes) { |
| 3027 | cond_resched(); |
| 3028 | goto again; |
| 3029 | } |
| 3030 | } |
| 3031 | next: |
| 3032 | path->slots[0]++; |
| 3033 | } |
| 3034 | |
| 3035 | btrfs_release_path(path); |
| 3036 | |
| 3037 | if (stop_loop) |
| 3038 | break; |
| 3039 | |
| 3040 | logic_start += map->stripe_len; |
| 3041 | } |
| 3042 | out: |
| 3043 | if (ret < 0) |
| 3044 | scrub_parity_mark_sectors_error(sparity, logic_start, |
Zhao Lei | a0dd59d | 2015-07-21 15:42:26 +0800 | [diff] [blame] | 3045 | logic_end - logic_start); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3046 | scrub_parity_put(sparity); |
| 3047 | scrub_submit(sctx); |
| 3048 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 3049 | scrub_wr_submit(sctx); |
| 3050 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
| 3051 | |
| 3052 | btrfs_release_path(path); |
| 3053 | return ret < 0 ? ret : 0; |
| 3054 | } |
| 3055 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3056 | static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3057 | struct map_lookup *map, |
| 3058 | struct btrfs_device *scrub_dev, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3059 | int num, u64 base, u64 length, |
| 3060 | int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3061 | { |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3062 | struct btrfs_path *path, *ppath; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3063 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3064 | struct btrfs_root *root = fs_info->extent_root; |
| 3065 | struct btrfs_root *csum_root = fs_info->csum_root; |
| 3066 | struct btrfs_extent_item *extent; |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 3067 | struct blk_plug plug; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3068 | u64 flags; |
| 3069 | int ret; |
| 3070 | int slot; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3071 | u64 nstripes; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3072 | struct extent_buffer *l; |
| 3073 | struct btrfs_key key; |
| 3074 | u64 physical; |
| 3075 | u64 logical; |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3076 | u64 logic_end; |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3077 | u64 physical_end; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3078 | u64 generation; |
Jan Schmidt | e12fa9c | 2011-06-17 15:55:21 +0200 | [diff] [blame] | 3079 | int mirror_num; |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 3080 | struct reada_control *reada1; |
| 3081 | struct reada_control *reada2; |
| 3082 | struct btrfs_key key_start; |
| 3083 | struct btrfs_key key_end; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3084 | u64 increment = map->stripe_len; |
| 3085 | u64 offset; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3086 | u64 extent_logical; |
| 3087 | u64 extent_physical; |
| 3088 | u64 extent_len; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3089 | u64 stripe_logical; |
| 3090 | u64 stripe_end; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3091 | struct btrfs_device *extent_dev; |
| 3092 | int extent_mirror_num; |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3093 | int stop_loop = 0; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 3094 | |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3095 | physical = map->stripes[num].physical; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3096 | offset = 0; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 3097 | nstripes = div_u64(length, map->stripe_len); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3098 | if (map->type & BTRFS_BLOCK_GROUP_RAID0) { |
| 3099 | offset = map->stripe_len * num; |
| 3100 | increment = map->stripe_len * map->num_stripes; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 3101 | mirror_num = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3102 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { |
| 3103 | int factor = map->num_stripes / map->sub_stripes; |
| 3104 | offset = map->stripe_len * (num / map->sub_stripes); |
| 3105 | increment = map->stripe_len * factor; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 3106 | mirror_num = num % map->sub_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3107 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { |
| 3108 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 3109 | mirror_num = num % map->num_stripes + 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3110 | } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { |
| 3111 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 3112 | mirror_num = num % map->num_stripes + 1; |
Zhao Lei | ffe2d20 | 2015-01-20 15:11:44 +0800 | [diff] [blame] | 3113 | } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3114 | get_raid56_logic_offset(physical, num, map, &offset, NULL); |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3115 | increment = map->stripe_len * nr_data_stripes(map); |
| 3116 | mirror_num = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3117 | } else { |
| 3118 | increment = map->stripe_len; |
Jan Schmidt | 193ea74 | 2011-06-13 19:56:54 +0200 | [diff] [blame] | 3119 | mirror_num = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3120 | } |
| 3121 | |
| 3122 | path = btrfs_alloc_path(); |
| 3123 | if (!path) |
| 3124 | return -ENOMEM; |
| 3125 | |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3126 | ppath = btrfs_alloc_path(); |
| 3127 | if (!ppath) { |
Tsutomu Itoh | 379d685 | 2015-01-09 17:37:52 +0900 | [diff] [blame] | 3128 | btrfs_free_path(path); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3129 | return -ENOMEM; |
| 3130 | } |
| 3131 | |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 3132 | /* |
| 3133 | * work on commit root. The related disk blocks are static as |
| 3134 | * long as COW is applied. This means, it is save to rewrite |
| 3135 | * them to repair disk errors without any race conditions |
| 3136 | */ |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3137 | path->search_commit_root = 1; |
| 3138 | path->skip_locking = 1; |
| 3139 | |
Gui Hecheng | 063c54d | 2015-01-09 09:39:40 +0800 | [diff] [blame] | 3140 | ppath->search_commit_root = 1; |
| 3141 | ppath->skip_locking = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3142 | /* |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 3143 | * trigger the readahead for extent tree csum tree and wait for |
| 3144 | * completion. During readahead, the scrub is officially paused |
| 3145 | * to not hold off transaction commits |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3146 | */ |
| 3147 | logical = base + offset; |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3148 | physical_end = physical + nstripes * map->stripe_len; |
Zhao Lei | ffe2d20 | 2015-01-20 15:11:44 +0800 | [diff] [blame] | 3149 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3150 | get_raid56_logic_offset(physical_end, num, |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3151 | map, &logic_end, NULL); |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3152 | logic_end += base; |
| 3153 | } else { |
| 3154 | logic_end = logical + increment * nstripes; |
| 3155 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3156 | wait_event(sctx->list_wait, |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 3157 | atomic_read(&sctx->bios_in_flight) == 0); |
Wang Shilong | cb7ab02 | 2013-12-04 21:16:53 +0800 | [diff] [blame] | 3158 | scrub_blocked_if_needed(fs_info); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3159 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 3160 | /* FIXME it might be better to start readahead at commit root */ |
| 3161 | key_start.objectid = logical; |
| 3162 | key_start.type = BTRFS_EXTENT_ITEM_KEY; |
| 3163 | key_start.offset = (u64)0; |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3164 | key_end.objectid = logic_end; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3165 | key_end.type = BTRFS_METADATA_ITEM_KEY; |
| 3166 | key_end.offset = (u64)-1; |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 3167 | reada1 = btrfs_reada_add(root, &key_start, &key_end); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3168 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 3169 | key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 3170 | key_start.type = BTRFS_EXTENT_CSUM_KEY; |
| 3171 | key_start.offset = logical; |
| 3172 | key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 3173 | key_end.type = BTRFS_EXTENT_CSUM_KEY; |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3174 | key_end.offset = logic_end; |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 3175 | reada2 = btrfs_reada_add(csum_root, &key_start, &key_end); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3176 | |
Arne Jansen | 7a26285 | 2011-06-10 12:39:23 +0200 | [diff] [blame] | 3177 | if (!IS_ERR(reada1)) |
| 3178 | btrfs_reada_wait(reada1); |
| 3179 | if (!IS_ERR(reada2)) |
| 3180 | btrfs_reada_wait(reada2); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3181 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3182 | |
| 3183 | /* |
| 3184 | * collect all data csums for the stripe to avoid seeking during |
| 3185 | * the scrub. This might currently (crc32) end up to be about 1MB |
| 3186 | */ |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 3187 | blk_start_plug(&plug); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3188 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3189 | /* |
| 3190 | * now find all extents for each stripe and scrub them |
| 3191 | */ |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3192 | ret = 0; |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3193 | while (physical < physical_end) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3194 | /* |
| 3195 | * canceled? |
| 3196 | */ |
| 3197 | if (atomic_read(&fs_info->scrub_cancel_req) || |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3198 | atomic_read(&sctx->cancel_req)) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3199 | ret = -ECANCELED; |
| 3200 | goto out; |
| 3201 | } |
| 3202 | /* |
| 3203 | * check to see if we have to pause |
| 3204 | */ |
| 3205 | if (atomic_read(&fs_info->scrub_pause_req)) { |
| 3206 | /* push queued extents */ |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3207 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3208 | scrub_submit(sctx); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3209 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 3210 | scrub_wr_submit(sctx); |
| 3211 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3212 | wait_event(sctx->list_wait, |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 3213 | atomic_read(&sctx->bios_in_flight) == 0); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3214 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
Wang Shilong | 3cb0929 | 2013-12-04 21:15:19 +0800 | [diff] [blame] | 3215 | scrub_blocked_if_needed(fs_info); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3216 | } |
| 3217 | |
Zhao Lei | f2f66a2 | 2015-07-21 12:22:29 +0800 | [diff] [blame] | 3218 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
| 3219 | ret = get_raid56_logic_offset(physical, num, map, |
| 3220 | &logical, |
| 3221 | &stripe_logical); |
| 3222 | logical += base; |
| 3223 | if (ret) { |
Zhao Lei | 7955323 | 2015-08-18 17:54:30 +0800 | [diff] [blame] | 3224 | /* it is parity strip */ |
Zhao Lei | f2f66a2 | 2015-07-21 12:22:29 +0800 | [diff] [blame] | 3225 | stripe_logical += base; |
Zhao Lei | a0dd59d | 2015-07-21 15:42:26 +0800 | [diff] [blame] | 3226 | stripe_end = stripe_logical + increment; |
Zhao Lei | f2f66a2 | 2015-07-21 12:22:29 +0800 | [diff] [blame] | 3227 | ret = scrub_raid56_parity(sctx, map, scrub_dev, |
| 3228 | ppath, stripe_logical, |
| 3229 | stripe_end); |
| 3230 | if (ret) |
| 3231 | goto out; |
| 3232 | goto skip; |
| 3233 | } |
| 3234 | } |
| 3235 | |
Wang Shilong | 7c76edb | 2014-01-12 21:38:32 +0800 | [diff] [blame] | 3236 | if (btrfs_fs_incompat(fs_info, SKINNY_METADATA)) |
| 3237 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 3238 | else |
| 3239 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3240 | key.objectid = logical; |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3241 | key.offset = (u64)-1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3242 | |
| 3243 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 3244 | if (ret < 0) |
| 3245 | goto out; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3246 | |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 3247 | if (ret > 0) { |
Wang Shilong | ade2e0b | 2014-01-12 21:38:33 +0800 | [diff] [blame] | 3248 | ret = btrfs_previous_extent_item(root, path, 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3249 | if (ret < 0) |
| 3250 | goto out; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 3251 | if (ret > 0) { |
| 3252 | /* there's no smaller item, so stick with the |
| 3253 | * larger one */ |
| 3254 | btrfs_release_path(path); |
| 3255 | ret = btrfs_search_slot(NULL, root, &key, |
| 3256 | path, 0, 0); |
| 3257 | if (ret < 0) |
| 3258 | goto out; |
| 3259 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3260 | } |
| 3261 | |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3262 | stop_loop = 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3263 | while (1) { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3264 | u64 bytes; |
| 3265 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3266 | l = path->nodes[0]; |
| 3267 | slot = path->slots[0]; |
| 3268 | if (slot >= btrfs_header_nritems(l)) { |
| 3269 | ret = btrfs_next_leaf(root, path); |
| 3270 | if (ret == 0) |
| 3271 | continue; |
| 3272 | if (ret < 0) |
| 3273 | goto out; |
| 3274 | |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3275 | stop_loop = 1; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3276 | break; |
| 3277 | } |
| 3278 | btrfs_item_key_to_cpu(l, &key, slot); |
| 3279 | |
Zhao Lei | d7cad23 | 2015-07-22 13:14:48 +0800 | [diff] [blame] | 3280 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
| 3281 | key.type != BTRFS_METADATA_ITEM_KEY) |
| 3282 | goto next; |
| 3283 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3284 | if (key.type == BTRFS_METADATA_ITEM_KEY) |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 3285 | bytes = root->nodesize; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3286 | else |
| 3287 | bytes = key.offset; |
| 3288 | |
| 3289 | if (key.objectid + bytes <= logical) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3290 | goto next; |
| 3291 | |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3292 | if (key.objectid >= logical + map->stripe_len) { |
| 3293 | /* out of this device extent */ |
| 3294 | if (key.objectid >= logic_end) |
| 3295 | stop_loop = 1; |
| 3296 | break; |
| 3297 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3298 | |
| 3299 | extent = btrfs_item_ptr(l, slot, |
| 3300 | struct btrfs_extent_item); |
| 3301 | flags = btrfs_extent_flags(l, extent); |
| 3302 | generation = btrfs_extent_generation(l, extent); |
| 3303 | |
Zhao Lei | a323e81 | 2015-07-23 12:29:49 +0800 | [diff] [blame] | 3304 | if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) && |
| 3305 | (key.objectid < logical || |
| 3306 | key.objectid + bytes > |
| 3307 | logical + map->stripe_len)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 3308 | btrfs_err(fs_info, |
| 3309 | "scrub: tree block %llu spanning " |
| 3310 | "stripes, ignored. logical=%llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 3311 | key.objectid, logical); |
Zhao Lei | 9799d2c | 2015-08-25 21:31:40 +0800 | [diff] [blame] | 3312 | spin_lock(&sctx->stat_lock); |
| 3313 | sctx->stat.uncorrectable_errors++; |
| 3314 | spin_unlock(&sctx->stat_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3315 | goto next; |
| 3316 | } |
| 3317 | |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3318 | again: |
| 3319 | extent_logical = key.objectid; |
| 3320 | extent_len = bytes; |
| 3321 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3322 | /* |
| 3323 | * trim extent to this stripe |
| 3324 | */ |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3325 | if (extent_logical < logical) { |
| 3326 | extent_len -= logical - extent_logical; |
| 3327 | extent_logical = logical; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3328 | } |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3329 | if (extent_logical + extent_len > |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3330 | logical + map->stripe_len) { |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3331 | extent_len = logical + map->stripe_len - |
| 3332 | extent_logical; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3333 | } |
| 3334 | |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3335 | extent_physical = extent_logical - logical + physical; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3336 | extent_dev = scrub_dev; |
| 3337 | extent_mirror_num = mirror_num; |
| 3338 | if (is_dev_replace) |
| 3339 | scrub_remap_extent(fs_info, extent_logical, |
| 3340 | extent_len, &extent_physical, |
| 3341 | &extent_dev, |
| 3342 | &extent_mirror_num); |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3343 | |
Zhao Lei | fe8cf65 | 2015-07-22 13:14:47 +0800 | [diff] [blame] | 3344 | ret = btrfs_lookup_csums_range(csum_root, |
| 3345 | extent_logical, |
| 3346 | extent_logical + |
| 3347 | extent_len - 1, |
| 3348 | &sctx->csum_list, 1); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3349 | if (ret) |
| 3350 | goto out; |
| 3351 | |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3352 | ret = scrub_extent(sctx, extent_logical, extent_len, |
| 3353 | extent_physical, extent_dev, flags, |
| 3354 | generation, extent_mirror_num, |
Stefan Behrens | 115930c | 2013-07-04 16:14:23 +0200 | [diff] [blame] | 3355 | extent_logical - logical + physical); |
Zhao Lei | 6fa96d7 | 2015-07-21 12:22:30 +0800 | [diff] [blame] | 3356 | |
| 3357 | scrub_free_csums(sctx); |
| 3358 | |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3359 | if (ret) |
| 3360 | goto out; |
| 3361 | |
| 3362 | if (extent_logical + extent_len < |
| 3363 | key.objectid + bytes) { |
Zhao Lei | ffe2d20 | 2015-01-20 15:11:44 +0800 | [diff] [blame] | 3364 | if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3365 | /* |
| 3366 | * loop until we find next data stripe |
| 3367 | * or we have finished all stripes. |
| 3368 | */ |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3369 | loop: |
| 3370 | physical += map->stripe_len; |
| 3371 | ret = get_raid56_logic_offset(physical, |
| 3372 | num, map, &logical, |
| 3373 | &stripe_logical); |
| 3374 | logical += base; |
| 3375 | |
| 3376 | if (ret && physical < physical_end) { |
| 3377 | stripe_logical += base; |
| 3378 | stripe_end = stripe_logical + |
Zhao Lei | a0dd59d | 2015-07-21 15:42:26 +0800 | [diff] [blame] | 3379 | increment; |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3380 | ret = scrub_raid56_parity(sctx, |
| 3381 | map, scrub_dev, ppath, |
| 3382 | stripe_logical, |
| 3383 | stripe_end); |
| 3384 | if (ret) |
| 3385 | goto out; |
| 3386 | goto loop; |
| 3387 | } |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3388 | } else { |
| 3389 | physical += map->stripe_len; |
| 3390 | logical += increment; |
| 3391 | } |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3392 | if (logical < key.objectid + bytes) { |
| 3393 | cond_resched(); |
| 3394 | goto again; |
| 3395 | } |
| 3396 | |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3397 | if (physical >= physical_end) { |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3398 | stop_loop = 1; |
| 3399 | break; |
| 3400 | } |
| 3401 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3402 | next: |
| 3403 | path->slots[0]++; |
| 3404 | } |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 3405 | btrfs_release_path(path); |
Wang Shilong | 3b080b2 | 2014-04-01 18:01:43 +0800 | [diff] [blame] | 3406 | skip: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3407 | logical += increment; |
| 3408 | physical += map->stripe_len; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3409 | spin_lock(&sctx->stat_lock); |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3410 | if (stop_loop) |
| 3411 | sctx->stat.last_physical = map->stripes[num].physical + |
| 3412 | length; |
| 3413 | else |
| 3414 | sctx->stat.last_physical = physical; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3415 | spin_unlock(&sctx->stat_lock); |
Liu Bo | 625f1c8d | 2013-04-27 02:56:57 +0000 | [diff] [blame] | 3416 | if (stop_loop) |
| 3417 | break; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3418 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3419 | out: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3420 | /* push queued extents */ |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3421 | scrub_submit(sctx); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3422 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 3423 | scrub_wr_submit(sctx); |
| 3424 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3425 | |
Arne Jansen | e7786c3 | 2011-05-28 20:58:38 +0000 | [diff] [blame] | 3426 | blk_finish_plug(&plug); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3427 | btrfs_free_path(path); |
Miao Xie | 5a6ac9e | 2014-11-06 17:20:58 +0800 | [diff] [blame] | 3428 | btrfs_free_path(ppath); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3429 | return ret < 0 ? ret : 0; |
| 3430 | } |
| 3431 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3432 | static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3433 | struct btrfs_device *scrub_dev, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3434 | u64 chunk_offset, u64 length, |
Filipe Manana | 020d5b7 | 2015-11-19 10:57:20 +0000 | [diff] [blame] | 3435 | u64 dev_offset, |
| 3436 | struct btrfs_block_group_cache *cache, |
| 3437 | int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3438 | { |
| 3439 | struct btrfs_mapping_tree *map_tree = |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3440 | &sctx->dev_root->fs_info->mapping_tree; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3441 | struct map_lookup *map; |
| 3442 | struct extent_map *em; |
| 3443 | int i; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3444 | int ret = 0; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3445 | |
| 3446 | read_lock(&map_tree->map_tree.lock); |
| 3447 | em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1); |
| 3448 | read_unlock(&map_tree->map_tree.lock); |
| 3449 | |
Filipe Manana | 020d5b7 | 2015-11-19 10:57:20 +0000 | [diff] [blame] | 3450 | if (!em) { |
| 3451 | /* |
| 3452 | * Might have been an unused block group deleted by the cleaner |
| 3453 | * kthread or relocation. |
| 3454 | */ |
| 3455 | spin_lock(&cache->lock); |
| 3456 | if (!cache->removed) |
| 3457 | ret = -EINVAL; |
| 3458 | spin_unlock(&cache->lock); |
| 3459 | |
| 3460 | return ret; |
| 3461 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3462 | |
Jeff Mahoney | 95617d6 | 2015-06-03 10:55:48 -0400 | [diff] [blame] | 3463 | map = em->map_lookup; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3464 | if (em->start != chunk_offset) |
| 3465 | goto out; |
| 3466 | |
| 3467 | if (em->len < length) |
| 3468 | goto out; |
| 3469 | |
| 3470 | for (i = 0; i < map->num_stripes; ++i) { |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3471 | if (map->stripes[i].dev->bdev == scrub_dev->bdev && |
Arne Jansen | 859acaf | 2012-02-09 15:09:02 +0100 | [diff] [blame] | 3472 | map->stripes[i].physical == dev_offset) { |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3473 | ret = scrub_stripe(sctx, map, scrub_dev, i, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3474 | chunk_offset, length, |
| 3475 | is_dev_replace); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3476 | if (ret) |
| 3477 | goto out; |
| 3478 | } |
| 3479 | } |
| 3480 | out: |
| 3481 | free_extent_map(em); |
| 3482 | |
| 3483 | return ret; |
| 3484 | } |
| 3485 | |
| 3486 | static noinline_for_stack |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3487 | int scrub_enumerate_chunks(struct scrub_ctx *sctx, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3488 | struct btrfs_device *scrub_dev, u64 start, u64 end, |
| 3489 | int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3490 | { |
| 3491 | struct btrfs_dev_extent *dev_extent = NULL; |
| 3492 | struct btrfs_path *path; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3493 | struct btrfs_root *root = sctx->dev_root; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3494 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 3495 | u64 length; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3496 | u64 chunk_offset; |
Zhaolei | 55e3a60 | 2015-08-05 16:43:30 +0800 | [diff] [blame] | 3497 | int ret = 0; |
Zhaolei | 76a8efa | 2015-11-17 18:46:17 +0800 | [diff] [blame] | 3498 | int ro_set; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3499 | int slot; |
| 3500 | struct extent_buffer *l; |
| 3501 | struct btrfs_key key; |
| 3502 | struct btrfs_key found_key; |
| 3503 | struct btrfs_block_group_cache *cache; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3504 | struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3505 | |
| 3506 | path = btrfs_alloc_path(); |
| 3507 | if (!path) |
| 3508 | return -ENOMEM; |
| 3509 | |
David Sterba | e4058b5 | 2015-11-27 16:31:35 +0100 | [diff] [blame] | 3510 | path->reada = READA_FORWARD; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3511 | path->search_commit_root = 1; |
| 3512 | path->skip_locking = 1; |
| 3513 | |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3514 | key.objectid = scrub_dev->devid; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3515 | key.offset = 0ull; |
| 3516 | key.type = BTRFS_DEV_EXTENT_KEY; |
| 3517 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3518 | while (1) { |
| 3519 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 3520 | if (ret < 0) |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 3521 | break; |
| 3522 | if (ret > 0) { |
| 3523 | if (path->slots[0] >= |
| 3524 | btrfs_header_nritems(path->nodes[0])) { |
| 3525 | ret = btrfs_next_leaf(root, path); |
Zhaolei | 55e3a60 | 2015-08-05 16:43:30 +0800 | [diff] [blame] | 3526 | if (ret < 0) |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 3527 | break; |
Zhaolei | 55e3a60 | 2015-08-05 16:43:30 +0800 | [diff] [blame] | 3528 | if (ret > 0) { |
| 3529 | ret = 0; |
| 3530 | break; |
| 3531 | } |
| 3532 | } else { |
| 3533 | ret = 0; |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 3534 | } |
| 3535 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3536 | |
| 3537 | l = path->nodes[0]; |
| 3538 | slot = path->slots[0]; |
| 3539 | |
| 3540 | btrfs_item_key_to_cpu(l, &found_key, slot); |
| 3541 | |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3542 | if (found_key.objectid != scrub_dev->devid) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3543 | break; |
| 3544 | |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 3545 | if (found_key.type != BTRFS_DEV_EXTENT_KEY) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3546 | break; |
| 3547 | |
| 3548 | if (found_key.offset >= end) |
| 3549 | break; |
| 3550 | |
| 3551 | if (found_key.offset < key.offset) |
| 3552 | break; |
| 3553 | |
| 3554 | dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); |
| 3555 | length = btrfs_dev_extent_length(l, dev_extent); |
| 3556 | |
Qu Wenruo | ced96ed | 2014-06-19 10:42:51 +0800 | [diff] [blame] | 3557 | if (found_key.offset + length <= start) |
| 3558 | goto skip; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3559 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3560 | chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent); |
| 3561 | |
| 3562 | /* |
| 3563 | * get a reference on the corresponding block group to prevent |
| 3564 | * the chunk from going away while we scrub it |
| 3565 | */ |
| 3566 | cache = btrfs_lookup_block_group(fs_info, chunk_offset); |
Qu Wenruo | ced96ed | 2014-06-19 10:42:51 +0800 | [diff] [blame] | 3567 | |
| 3568 | /* some chunks are removed but not committed to disk yet, |
| 3569 | * continue scrubbing */ |
| 3570 | if (!cache) |
| 3571 | goto skip; |
| 3572 | |
Zhaolei | 55e3a60 | 2015-08-05 16:43:30 +0800 | [diff] [blame] | 3573 | /* |
| 3574 | * we need call btrfs_inc_block_group_ro() with scrubs_paused, |
| 3575 | * to avoid deadlock caused by: |
| 3576 | * btrfs_inc_block_group_ro() |
| 3577 | * -> btrfs_wait_for_commit() |
| 3578 | * -> btrfs_commit_transaction() |
| 3579 | * -> btrfs_scrub_pause() |
| 3580 | */ |
| 3581 | scrub_pause_on(fs_info); |
| 3582 | ret = btrfs_inc_block_group_ro(root, cache); |
| 3583 | scrub_pause_off(fs_info); |
Zhaolei | 76a8efa | 2015-11-17 18:46:17 +0800 | [diff] [blame] | 3584 | |
| 3585 | if (ret == 0) { |
| 3586 | ro_set = 1; |
| 3587 | } else if (ret == -ENOSPC) { |
| 3588 | /* |
| 3589 | * btrfs_inc_block_group_ro return -ENOSPC when it |
| 3590 | * failed in creating new chunk for metadata. |
| 3591 | * It is not a problem for scrub/replace, because |
| 3592 | * metadata are always cowed, and our scrub paused |
| 3593 | * commit_transactions. |
| 3594 | */ |
| 3595 | ro_set = 0; |
| 3596 | } else { |
| 3597 | btrfs_warn(fs_info, "failed setting block group ro, ret=%d\n", |
| 3598 | ret); |
Zhaolei | 55e3a60 | 2015-08-05 16:43:30 +0800 | [diff] [blame] | 3599 | btrfs_put_block_group(cache); |
| 3600 | break; |
| 3601 | } |
| 3602 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3603 | dev_replace->cursor_right = found_key.offset + length; |
| 3604 | dev_replace->cursor_left = found_key.offset; |
| 3605 | dev_replace->item_needs_writeback = 1; |
Zhao Lei | 8c204c9 | 2015-08-19 15:02:40 +0800 | [diff] [blame] | 3606 | ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length, |
Filipe Manana | 020d5b7 | 2015-11-19 10:57:20 +0000 | [diff] [blame] | 3607 | found_key.offset, cache, is_dev_replace); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3608 | |
| 3609 | /* |
| 3610 | * flush, submit all pending read and write bios, afterwards |
| 3611 | * wait for them. |
| 3612 | * Note that in the dev replace case, a read request causes |
| 3613 | * write requests that are submitted in the read completion |
| 3614 | * worker. Therefore in the current situation, it is required |
| 3615 | * that all write requests are flushed, so that all read and |
| 3616 | * write requests are really completed when bios_in_flight |
| 3617 | * changes to 0. |
| 3618 | */ |
| 3619 | atomic_set(&sctx->wr_ctx.flush_all_writes, 1); |
| 3620 | scrub_submit(sctx); |
| 3621 | mutex_lock(&sctx->wr_ctx.wr_lock); |
| 3622 | scrub_wr_submit(sctx); |
| 3623 | mutex_unlock(&sctx->wr_ctx.wr_lock); |
| 3624 | |
| 3625 | wait_event(sctx->list_wait, |
| 3626 | atomic_read(&sctx->bios_in_flight) == 0); |
Zhaolei | b708ce9 | 2015-08-05 16:43:29 +0800 | [diff] [blame] | 3627 | |
| 3628 | scrub_pause_on(fs_info); |
Wang Shilong | 12cf937 | 2014-02-19 19:24:17 +0800 | [diff] [blame] | 3629 | |
| 3630 | /* |
| 3631 | * must be called before we decrease @scrub_paused. |
| 3632 | * make sure we don't block transaction commit while |
| 3633 | * we are waiting pending workers finished. |
| 3634 | */ |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3635 | wait_event(sctx->list_wait, |
| 3636 | atomic_read(&sctx->workers_pending) == 0); |
Wang Shilong | 12cf937 | 2014-02-19 19:24:17 +0800 | [diff] [blame] | 3637 | atomic_set(&sctx->wr_ctx.flush_all_writes, 0); |
| 3638 | |
Zhaolei | b708ce9 | 2015-08-05 16:43:29 +0800 | [diff] [blame] | 3639 | scrub_pause_off(fs_info); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3640 | |
Zhaolei | 76a8efa | 2015-11-17 18:46:17 +0800 | [diff] [blame] | 3641 | if (ro_set) |
| 3642 | btrfs_dec_block_group_ro(root, cache); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3643 | |
Filipe Manana | 758f2df | 2015-11-19 11:45:48 +0000 | [diff] [blame] | 3644 | /* |
| 3645 | * We might have prevented the cleaner kthread from deleting |
| 3646 | * this block group if it was already unused because we raced |
| 3647 | * and set it to RO mode first. So add it back to the unused |
| 3648 | * list, otherwise it might not ever be deleted unless a manual |
| 3649 | * balance is triggered or it becomes used and unused again. |
| 3650 | */ |
| 3651 | spin_lock(&cache->lock); |
| 3652 | if (!cache->removed && !cache->ro && cache->reserved == 0 && |
| 3653 | btrfs_block_group_used(&cache->item) == 0) { |
| 3654 | spin_unlock(&cache->lock); |
| 3655 | spin_lock(&fs_info->unused_bgs_lock); |
| 3656 | if (list_empty(&cache->bg_list)) { |
| 3657 | btrfs_get_block_group(cache); |
| 3658 | list_add_tail(&cache->bg_list, |
| 3659 | &fs_info->unused_bgs); |
| 3660 | } |
| 3661 | spin_unlock(&fs_info->unused_bgs_lock); |
| 3662 | } else { |
| 3663 | spin_unlock(&cache->lock); |
| 3664 | } |
| 3665 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3666 | btrfs_put_block_group(cache); |
| 3667 | if (ret) |
| 3668 | break; |
Stefan Behrens | af1be4f | 2012-11-27 17:39:51 +0000 | [diff] [blame] | 3669 | if (is_dev_replace && |
| 3670 | atomic64_read(&dev_replace->num_write_errors) > 0) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3671 | ret = -EIO; |
| 3672 | break; |
| 3673 | } |
| 3674 | if (sctx->stat.malloc_errors > 0) { |
| 3675 | ret = -ENOMEM; |
| 3676 | break; |
| 3677 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3678 | |
Ilya Dryomov | 539f358 | 2013-10-07 13:42:57 +0300 | [diff] [blame] | 3679 | dev_replace->cursor_left = dev_replace->cursor_right; |
| 3680 | dev_replace->item_needs_writeback = 1; |
Qu Wenruo | ced96ed | 2014-06-19 10:42:51 +0800 | [diff] [blame] | 3681 | skip: |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3682 | key.offset = found_key.offset + length; |
Chris Mason | 7126733 | 2011-05-23 06:30:52 -0400 | [diff] [blame] | 3683 | btrfs_release_path(path); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3684 | } |
| 3685 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3686 | btrfs_free_path(path); |
Arne Jansen | 8c51032 | 2011-06-03 10:09:26 +0200 | [diff] [blame] | 3687 | |
Zhaolei | 55e3a60 | 2015-08-05 16:43:30 +0800 | [diff] [blame] | 3688 | return ret; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3689 | } |
| 3690 | |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3691 | static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, |
| 3692 | struct btrfs_device *scrub_dev) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3693 | { |
| 3694 | int i; |
| 3695 | u64 bytenr; |
| 3696 | u64 gen; |
| 3697 | int ret; |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3698 | struct btrfs_root *root = sctx->dev_root; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3699 | |
Miao Xie | 87533c4 | 2013-01-29 10:14:48 +0000 | [diff] [blame] | 3700 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3701 | return -EIO; |
| 3702 | |
Miao Xie | 5f54606 | 2014-07-24 11:37:09 +0800 | [diff] [blame] | 3703 | /* Seed devices of a new filesystem has their own generation. */ |
| 3704 | if (scrub_dev->fs_devices != root->fs_info->fs_devices) |
| 3705 | gen = scrub_dev->generation; |
| 3706 | else |
| 3707 | gen = root->fs_info->last_trans_committed; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3708 | |
| 3709 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| 3710 | bytenr = btrfs_sb_offset(i); |
Miao Xie | 935e5cc | 2014-09-03 21:35:33 +0800 | [diff] [blame] | 3711 | if (bytenr + BTRFS_SUPER_INFO_SIZE > |
| 3712 | scrub_dev->commit_total_bytes) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3713 | break; |
| 3714 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3715 | ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr, |
Stefan Behrens | a36cf8b | 2012-11-02 13:26:57 +0100 | [diff] [blame] | 3716 | scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i, |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3717 | NULL, 1, bytenr); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3718 | if (ret) |
| 3719 | return ret; |
| 3720 | } |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 3721 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3722 | |
| 3723 | return 0; |
| 3724 | } |
| 3725 | |
| 3726 | /* |
| 3727 | * get a reference count on fs_info->scrub_workers. start worker if necessary |
| 3728 | */ |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3729 | static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info, |
| 3730 | int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3731 | { |
David Sterba | 6f01105 | 2015-02-16 18:34:01 +0100 | [diff] [blame] | 3732 | unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND; |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 3733 | int max_active = fs_info->thread_pool_size; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3734 | |
Arne Jansen | 632dd77 | 2011-06-10 12:07:07 +0200 | [diff] [blame] | 3735 | if (fs_info->scrub_workers_refcnt == 0) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3736 | if (is_dev_replace) |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 3737 | fs_info->scrub_workers = |
David Sterba | 0de270f | 2015-12-01 18:09:12 +0100 | [diff] [blame] | 3738 | btrfs_alloc_workqueue("scrub", flags, |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 3739 | 1, 4); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3740 | else |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 3741 | fs_info->scrub_workers = |
David Sterba | 0de270f | 2015-12-01 18:09:12 +0100 | [diff] [blame] | 3742 | btrfs_alloc_workqueue("scrub", flags, |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 3743 | max_active, 4); |
Zhao Lei | e82afc5 | 2015-06-12 20:36:58 +0800 | [diff] [blame] | 3744 | if (!fs_info->scrub_workers) |
| 3745 | goto fail_scrub_workers; |
| 3746 | |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 3747 | fs_info->scrub_wr_completion_workers = |
David Sterba | 0de270f | 2015-12-01 18:09:12 +0100 | [diff] [blame] | 3748 | btrfs_alloc_workqueue("scrubwrc", flags, |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 3749 | max_active, 2); |
Zhao Lei | e82afc5 | 2015-06-12 20:36:58 +0800 | [diff] [blame] | 3750 | if (!fs_info->scrub_wr_completion_workers) |
| 3751 | goto fail_scrub_wr_completion_workers; |
| 3752 | |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 3753 | fs_info->scrub_nocow_workers = |
David Sterba | 0de270f | 2015-12-01 18:09:12 +0100 | [diff] [blame] | 3754 | btrfs_alloc_workqueue("scrubnc", flags, 1, 0); |
Zhao Lei | e82afc5 | 2015-06-12 20:36:58 +0800 | [diff] [blame] | 3755 | if (!fs_info->scrub_nocow_workers) |
| 3756 | goto fail_scrub_nocow_workers; |
Zhao Lei | 20b2e30 | 2015-06-04 20:09:15 +0800 | [diff] [blame] | 3757 | fs_info->scrub_parity_workers = |
David Sterba | 0de270f | 2015-12-01 18:09:12 +0100 | [diff] [blame] | 3758 | btrfs_alloc_workqueue("scrubparity", flags, |
Zhao Lei | 20b2e30 | 2015-06-04 20:09:15 +0800 | [diff] [blame] | 3759 | max_active, 2); |
Zhao Lei | e82afc5 | 2015-06-12 20:36:58 +0800 | [diff] [blame] | 3760 | if (!fs_info->scrub_parity_workers) |
| 3761 | goto fail_scrub_parity_workers; |
Arne Jansen | 632dd77 | 2011-06-10 12:07:07 +0200 | [diff] [blame] | 3762 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3763 | ++fs_info->scrub_workers_refcnt; |
Zhao Lei | e82afc5 | 2015-06-12 20:36:58 +0800 | [diff] [blame] | 3764 | return 0; |
| 3765 | |
| 3766 | fail_scrub_parity_workers: |
| 3767 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); |
| 3768 | fail_scrub_nocow_workers: |
| 3769 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); |
| 3770 | fail_scrub_wr_completion_workers: |
| 3771 | btrfs_destroy_workqueue(fs_info->scrub_workers); |
| 3772 | fail_scrub_workers: |
| 3773 | return -ENOMEM; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3774 | } |
| 3775 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3776 | 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] | 3777 | { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3778 | if (--fs_info->scrub_workers_refcnt == 0) { |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 3779 | btrfs_destroy_workqueue(fs_info->scrub_workers); |
| 3780 | btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers); |
| 3781 | btrfs_destroy_workqueue(fs_info->scrub_nocow_workers); |
Zhao Lei | 20b2e30 | 2015-06-04 20:09:15 +0800 | [diff] [blame] | 3782 | btrfs_destroy_workqueue(fs_info->scrub_parity_workers); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3783 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3784 | WARN_ON(fs_info->scrub_workers_refcnt < 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3785 | } |
| 3786 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3787 | int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, |
| 3788 | u64 end, struct btrfs_scrub_progress *progress, |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 3789 | int readonly, int is_dev_replace) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3790 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3791 | struct scrub_ctx *sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3792 | int ret; |
| 3793 | struct btrfs_device *dev; |
Miao Xie | 5d68da3 | 2014-07-24 11:37:07 +0800 | [diff] [blame] | 3794 | struct rcu_string *name; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3795 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3796 | if (btrfs_fs_closing(fs_info)) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3797 | return -EINVAL; |
| 3798 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3799 | if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 3800 | /* |
| 3801 | * in this case scrub is unable to calculate the checksum |
| 3802 | * the way scrub is implemented. Do not handle this |
| 3803 | * situation at all because it won't ever happen. |
| 3804 | */ |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 3805 | btrfs_err(fs_info, |
| 3806 | "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails", |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3807 | fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN); |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 3808 | return -EINVAL; |
| 3809 | } |
| 3810 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3811 | if (fs_info->chunk_root->sectorsize != PAGE_SIZE) { |
Stefan Behrens | b5d67f6 | 2012-03-27 14:21:27 -0400 | [diff] [blame] | 3812 | /* not supported for data w/o checksums */ |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 3813 | btrfs_err(fs_info, |
| 3814 | "scrub: size assumption sectorsize != PAGE_SIZE " |
| 3815 | "(%d != %lu) fails", |
Geert Uytterhoeven | 27f9f02 | 2013-08-20 13:20:09 +0200 | [diff] [blame] | 3816 | fs_info->chunk_root->sectorsize, PAGE_SIZE); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3817 | return -EINVAL; |
| 3818 | } |
| 3819 | |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 3820 | if (fs_info->chunk_root->nodesize > |
| 3821 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK || |
| 3822 | fs_info->chunk_root->sectorsize > |
| 3823 | PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) { |
| 3824 | /* |
| 3825 | * would exhaust the array bounds of pagev member in |
| 3826 | * struct scrub_block |
| 3827 | */ |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 3828 | btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize " |
| 3829 | "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails", |
Stefan Behrens | 7a9e998 | 2012-11-02 14:58:04 +0100 | [diff] [blame] | 3830 | fs_info->chunk_root->nodesize, |
| 3831 | SCRUB_MAX_PAGES_PER_BLOCK, |
| 3832 | fs_info->chunk_root->sectorsize, |
| 3833 | SCRUB_MAX_PAGES_PER_BLOCK); |
| 3834 | return -EINVAL; |
| 3835 | } |
| 3836 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3837 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3838 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
| 3839 | dev = btrfs_find_device(fs_info, devid, NULL, NULL); |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 3840 | if (!dev || (dev->missing && !is_dev_replace)) { |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3841 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3842 | return -ENODEV; |
| 3843 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3844 | |
Miao Xie | 5d68da3 | 2014-07-24 11:37:07 +0800 | [diff] [blame] | 3845 | if (!is_dev_replace && !readonly && !dev->writeable) { |
| 3846 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 3847 | rcu_read_lock(); |
| 3848 | name = rcu_dereference(dev->name); |
| 3849 | btrfs_err(fs_info, "scrub: device %s is not writable", |
| 3850 | name->str); |
| 3851 | rcu_read_unlock(); |
| 3852 | return -EROFS; |
| 3853 | } |
| 3854 | |
Wang Shilong | 3b7a016 | 2013-10-12 02:11:12 +0800 | [diff] [blame] | 3855 | mutex_lock(&fs_info->scrub_lock); |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 3856 | if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3857 | mutex_unlock(&fs_info->scrub_lock); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3858 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3859 | return -EIO; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3860 | } |
| 3861 | |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 3862 | btrfs_dev_replace_lock(&fs_info->dev_replace, 0); |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 3863 | if (dev->scrub_device || |
| 3864 | (!is_dev_replace && |
| 3865 | btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) { |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 3866 | btrfs_dev_replace_unlock(&fs_info->dev_replace, 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3867 | mutex_unlock(&fs_info->scrub_lock); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3868 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3869 | return -EINPROGRESS; |
| 3870 | } |
Liu Bo | 73beece | 2015-07-17 16:49:19 +0800 | [diff] [blame] | 3871 | btrfs_dev_replace_unlock(&fs_info->dev_replace, 0); |
Wang Shilong | 3b7a016 | 2013-10-12 02:11:12 +0800 | [diff] [blame] | 3872 | |
| 3873 | ret = scrub_workers_get(fs_info, is_dev_replace); |
| 3874 | if (ret) { |
| 3875 | mutex_unlock(&fs_info->scrub_lock); |
| 3876 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 3877 | return ret; |
| 3878 | } |
| 3879 | |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 3880 | sctx = scrub_setup_ctx(dev, is_dev_replace); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3881 | if (IS_ERR(sctx)) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3882 | mutex_unlock(&fs_info->scrub_lock); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3883 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 3884 | scrub_workers_put(fs_info); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3885 | return PTR_ERR(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3886 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3887 | sctx->readonly = readonly; |
| 3888 | dev->scrub_device = sctx; |
Wang Shilong | 3cb0929 | 2013-12-04 21:15:19 +0800 | [diff] [blame] | 3889 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3890 | |
Wang Shilong | 3cb0929 | 2013-12-04 21:15:19 +0800 | [diff] [blame] | 3891 | /* |
| 3892 | * checking @scrub_pause_req here, we can avoid |
| 3893 | * race between committing transaction and scrubbing. |
| 3894 | */ |
Wang Shilong | cb7ab02 | 2013-12-04 21:16:53 +0800 | [diff] [blame] | 3895 | __scrub_blocked_if_needed(fs_info); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3896 | atomic_inc(&fs_info->scrubs_running); |
| 3897 | mutex_unlock(&fs_info->scrub_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3898 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3899 | if (!is_dev_replace) { |
Wang Shilong | 9b011ad | 2013-10-25 19:12:02 +0800 | [diff] [blame] | 3900 | /* |
| 3901 | * by holding device list mutex, we can |
| 3902 | * kick off writing super in log tree sync. |
| 3903 | */ |
Wang Shilong | 3cb0929 | 2013-12-04 21:15:19 +0800 | [diff] [blame] | 3904 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3905 | ret = scrub_supers(sctx, dev); |
Wang Shilong | 3cb0929 | 2013-12-04 21:15:19 +0800 | [diff] [blame] | 3906 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3907 | } |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3908 | |
| 3909 | if (!ret) |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 3910 | ret = scrub_enumerate_chunks(sctx, dev, start, end, |
| 3911 | is_dev_replace); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3912 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 3913 | wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3914 | atomic_dec(&fs_info->scrubs_running); |
| 3915 | wake_up(&fs_info->scrub_pause_wait); |
| 3916 | |
Stefan Behrens | b6bfebc | 2012-11-02 16:44:58 +0100 | [diff] [blame] | 3917 | wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0); |
Jan Schmidt | 0ef8e45 | 2011-06-13 20:04:15 +0200 | [diff] [blame] | 3918 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3919 | if (progress) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3920 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3921 | |
| 3922 | mutex_lock(&fs_info->scrub_lock); |
| 3923 | dev->scrub_device = NULL; |
Wang Shilong | 3b7a016 | 2013-10-12 02:11:12 +0800 | [diff] [blame] | 3924 | scrub_workers_put(fs_info); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3925 | mutex_unlock(&fs_info->scrub_lock); |
| 3926 | |
Filipe Manana | f55985f | 2015-02-09 21:14:24 +0000 | [diff] [blame] | 3927 | scrub_put_ctx(sctx); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3928 | |
| 3929 | return ret; |
| 3930 | } |
| 3931 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 3932 | void btrfs_scrub_pause(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3933 | { |
| 3934 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 3935 | |
| 3936 | mutex_lock(&fs_info->scrub_lock); |
| 3937 | atomic_inc(&fs_info->scrub_pause_req); |
| 3938 | while (atomic_read(&fs_info->scrubs_paused) != |
| 3939 | atomic_read(&fs_info->scrubs_running)) { |
| 3940 | mutex_unlock(&fs_info->scrub_lock); |
| 3941 | wait_event(fs_info->scrub_pause_wait, |
| 3942 | atomic_read(&fs_info->scrubs_paused) == |
| 3943 | atomic_read(&fs_info->scrubs_running)); |
| 3944 | mutex_lock(&fs_info->scrub_lock); |
| 3945 | } |
| 3946 | mutex_unlock(&fs_info->scrub_lock); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3947 | } |
| 3948 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 3949 | void btrfs_scrub_continue(struct btrfs_root *root) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3950 | { |
| 3951 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 3952 | |
| 3953 | atomic_dec(&fs_info->scrub_pause_req); |
| 3954 | wake_up(&fs_info->scrub_pause_wait); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3955 | } |
| 3956 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3957 | int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info) |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3958 | { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3959 | mutex_lock(&fs_info->scrub_lock); |
| 3960 | if (!atomic_read(&fs_info->scrubs_running)) { |
| 3961 | mutex_unlock(&fs_info->scrub_lock); |
| 3962 | return -ENOTCONN; |
| 3963 | } |
| 3964 | |
| 3965 | atomic_inc(&fs_info->scrub_cancel_req); |
| 3966 | while (atomic_read(&fs_info->scrubs_running)) { |
| 3967 | mutex_unlock(&fs_info->scrub_lock); |
| 3968 | wait_event(fs_info->scrub_pause_wait, |
| 3969 | atomic_read(&fs_info->scrubs_running) == 0); |
| 3970 | mutex_lock(&fs_info->scrub_lock); |
| 3971 | } |
| 3972 | atomic_dec(&fs_info->scrub_cancel_req); |
| 3973 | mutex_unlock(&fs_info->scrub_lock); |
| 3974 | |
| 3975 | return 0; |
| 3976 | } |
| 3977 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3978 | int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info, |
| 3979 | struct btrfs_device *dev) |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 3980 | { |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3981 | struct scrub_ctx *sctx; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3982 | |
| 3983 | mutex_lock(&fs_info->scrub_lock); |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3984 | sctx = dev->scrub_device; |
| 3985 | if (!sctx) { |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3986 | mutex_unlock(&fs_info->scrub_lock); |
| 3987 | return -ENOTCONN; |
| 3988 | } |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 3989 | atomic_inc(&sctx->cancel_req); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3990 | while (dev->scrub_device) { |
| 3991 | mutex_unlock(&fs_info->scrub_lock); |
| 3992 | wait_event(fs_info->scrub_pause_wait, |
| 3993 | dev->scrub_device == NULL); |
| 3994 | mutex_lock(&fs_info->scrub_lock); |
| 3995 | } |
| 3996 | mutex_unlock(&fs_info->scrub_lock); |
| 3997 | |
| 3998 | return 0; |
| 3999 | } |
Stefan Behrens | 1623ede | 2012-03-27 14:21:26 -0400 | [diff] [blame] | 4000 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 4001 | int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
| 4002 | struct btrfs_scrub_progress *progress) |
| 4003 | { |
| 4004 | struct btrfs_device *dev; |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 4005 | struct scrub_ctx *sctx = NULL; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 4006 | |
| 4007 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 4008 | dev = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 4009 | if (dev) |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 4010 | sctx = dev->scrub_device; |
| 4011 | if (sctx) |
| 4012 | memcpy(progress, &sctx->stat, sizeof(*progress)); |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 4013 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
| 4014 | |
Stefan Behrens | d9d181c | 2012-11-02 09:58:09 +0100 | [diff] [blame] | 4015 | return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV; |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 4016 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4017 | |
| 4018 | static void scrub_remap_extent(struct btrfs_fs_info *fs_info, |
| 4019 | u64 extent_logical, u64 extent_len, |
| 4020 | u64 *extent_physical, |
| 4021 | struct btrfs_device **extent_dev, |
| 4022 | int *extent_mirror_num) |
| 4023 | { |
| 4024 | u64 mapped_length; |
| 4025 | struct btrfs_bio *bbio = NULL; |
| 4026 | int ret; |
| 4027 | |
| 4028 | mapped_length = extent_len; |
| 4029 | ret = btrfs_map_block(fs_info, READ, extent_logical, |
| 4030 | &mapped_length, &bbio, 0); |
| 4031 | if (ret || !bbio || mapped_length < extent_len || |
| 4032 | !bbio->stripes[0].dev->bdev) { |
Zhao Lei | 6e9606d | 2015-01-20 15:11:34 +0800 | [diff] [blame] | 4033 | btrfs_put_bbio(bbio); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4034 | return; |
| 4035 | } |
| 4036 | |
| 4037 | *extent_physical = bbio->stripes[0].physical; |
| 4038 | *extent_mirror_num = bbio->mirror_num; |
| 4039 | *extent_dev = bbio->stripes[0].dev; |
Zhao Lei | 6e9606d | 2015-01-20 15:11:34 +0800 | [diff] [blame] | 4040 | btrfs_put_bbio(bbio); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4041 | } |
| 4042 | |
| 4043 | static int scrub_setup_wr_ctx(struct scrub_ctx *sctx, |
| 4044 | struct scrub_wr_ctx *wr_ctx, |
| 4045 | struct btrfs_fs_info *fs_info, |
| 4046 | struct btrfs_device *dev, |
| 4047 | int is_dev_replace) |
| 4048 | { |
| 4049 | WARN_ON(wr_ctx->wr_curr_bio != NULL); |
| 4050 | |
| 4051 | mutex_init(&wr_ctx->wr_lock); |
| 4052 | wr_ctx->wr_curr_bio = NULL; |
| 4053 | if (!is_dev_replace) |
| 4054 | return 0; |
| 4055 | |
| 4056 | WARN_ON(!dev->bdev); |
Kent Overstreet | b54ffb7 | 2015-05-19 14:31:01 +0200 | [diff] [blame] | 4057 | wr_ctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4058 | wr_ctx->tgtdev = dev; |
| 4059 | atomic_set(&wr_ctx->flush_all_writes, 0); |
| 4060 | return 0; |
| 4061 | } |
| 4062 | |
| 4063 | static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx) |
| 4064 | { |
| 4065 | mutex_lock(&wr_ctx->wr_lock); |
| 4066 | kfree(wr_ctx->wr_curr_bio); |
| 4067 | wr_ctx->wr_curr_bio = NULL; |
| 4068 | mutex_unlock(&wr_ctx->wr_lock); |
| 4069 | } |
| 4070 | |
| 4071 | static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len, |
| 4072 | int mirror_num, u64 physical_for_dev_replace) |
| 4073 | { |
| 4074 | struct scrub_copy_nocow_ctx *nocow_ctx; |
| 4075 | struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info; |
| 4076 | |
| 4077 | nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS); |
| 4078 | if (!nocow_ctx) { |
| 4079 | spin_lock(&sctx->stat_lock); |
| 4080 | sctx->stat.malloc_errors++; |
| 4081 | spin_unlock(&sctx->stat_lock); |
| 4082 | return -ENOMEM; |
| 4083 | } |
| 4084 | |
| 4085 | scrub_pending_trans_workers_inc(sctx); |
| 4086 | |
| 4087 | nocow_ctx->sctx = sctx; |
| 4088 | nocow_ctx->logical = logical; |
| 4089 | nocow_ctx->len = len; |
| 4090 | nocow_ctx->mirror_num = mirror_num; |
| 4091 | nocow_ctx->physical_for_dev_replace = physical_for_dev_replace; |
Liu Bo | 9e0af23 | 2014-08-15 23:36:53 +0800 | [diff] [blame] | 4092 | btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper, |
| 4093 | copy_nocow_pages_worker, NULL, NULL); |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4094 | INIT_LIST_HEAD(&nocow_ctx->inodes); |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 4095 | btrfs_queue_work(fs_info->scrub_nocow_workers, |
| 4096 | &nocow_ctx->work); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4097 | |
| 4098 | return 0; |
| 4099 | } |
| 4100 | |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4101 | static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx) |
| 4102 | { |
| 4103 | struct scrub_copy_nocow_ctx *nocow_ctx = ctx; |
| 4104 | struct scrub_nocow_inode *nocow_inode; |
| 4105 | |
| 4106 | nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS); |
| 4107 | if (!nocow_inode) |
| 4108 | return -ENOMEM; |
| 4109 | nocow_inode->inum = inum; |
| 4110 | nocow_inode->offset = offset; |
| 4111 | nocow_inode->root = root; |
| 4112 | list_add_tail(&nocow_inode->list, &nocow_ctx->inodes); |
| 4113 | return 0; |
| 4114 | } |
| 4115 | |
| 4116 | #define COPY_COMPLETE 1 |
| 4117 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4118 | static void copy_nocow_pages_worker(struct btrfs_work *work) |
| 4119 | { |
| 4120 | struct scrub_copy_nocow_ctx *nocow_ctx = |
| 4121 | container_of(work, struct scrub_copy_nocow_ctx, work); |
| 4122 | struct scrub_ctx *sctx = nocow_ctx->sctx; |
| 4123 | u64 logical = nocow_ctx->logical; |
| 4124 | u64 len = nocow_ctx->len; |
| 4125 | int mirror_num = nocow_ctx->mirror_num; |
| 4126 | u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
| 4127 | int ret; |
| 4128 | struct btrfs_trans_handle *trans = NULL; |
| 4129 | struct btrfs_fs_info *fs_info; |
| 4130 | struct btrfs_path *path; |
| 4131 | struct btrfs_root *root; |
| 4132 | int not_written = 0; |
| 4133 | |
| 4134 | fs_info = sctx->dev_root->fs_info; |
| 4135 | root = fs_info->extent_root; |
| 4136 | |
| 4137 | path = btrfs_alloc_path(); |
| 4138 | if (!path) { |
| 4139 | spin_lock(&sctx->stat_lock); |
| 4140 | sctx->stat.malloc_errors++; |
| 4141 | spin_unlock(&sctx->stat_lock); |
| 4142 | not_written = 1; |
| 4143 | goto out; |
| 4144 | } |
| 4145 | |
| 4146 | trans = btrfs_join_transaction(root); |
| 4147 | if (IS_ERR(trans)) { |
| 4148 | not_written = 1; |
| 4149 | goto out; |
| 4150 | } |
| 4151 | |
| 4152 | ret = iterate_inodes_from_logical(logical, fs_info, path, |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4153 | record_inode_for_nocow, nocow_ctx); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4154 | if (ret != 0 && ret != -ENOENT) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 4155 | btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, " |
| 4156 | "phys %llu, len %llu, mir %u, ret %d", |
Geert Uytterhoeven | 118a0a2 | 2013-08-20 13:20:10 +0200 | [diff] [blame] | 4157 | logical, physical_for_dev_replace, len, mirror_num, |
| 4158 | ret); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4159 | not_written = 1; |
| 4160 | goto out; |
| 4161 | } |
| 4162 | |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4163 | btrfs_end_transaction(trans, root); |
| 4164 | trans = NULL; |
| 4165 | while (!list_empty(&nocow_ctx->inodes)) { |
| 4166 | struct scrub_nocow_inode *entry; |
| 4167 | entry = list_first_entry(&nocow_ctx->inodes, |
| 4168 | struct scrub_nocow_inode, |
| 4169 | list); |
| 4170 | list_del_init(&entry->list); |
| 4171 | ret = copy_nocow_pages_for_inode(entry->inum, entry->offset, |
| 4172 | entry->root, nocow_ctx); |
| 4173 | kfree(entry); |
| 4174 | if (ret == COPY_COMPLETE) { |
| 4175 | ret = 0; |
| 4176 | break; |
| 4177 | } else if (ret) { |
| 4178 | break; |
| 4179 | } |
| 4180 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4181 | out: |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4182 | while (!list_empty(&nocow_ctx->inodes)) { |
| 4183 | struct scrub_nocow_inode *entry; |
| 4184 | entry = list_first_entry(&nocow_ctx->inodes, |
| 4185 | struct scrub_nocow_inode, |
| 4186 | list); |
| 4187 | list_del_init(&entry->list); |
| 4188 | kfree(entry); |
| 4189 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4190 | if (trans && !IS_ERR(trans)) |
| 4191 | btrfs_end_transaction(trans, root); |
| 4192 | if (not_written) |
| 4193 | btrfs_dev_replace_stats_inc(&fs_info->dev_replace. |
| 4194 | num_uncorrectable_read_errors); |
| 4195 | |
| 4196 | btrfs_free_path(path); |
| 4197 | kfree(nocow_ctx); |
| 4198 | |
| 4199 | scrub_pending_trans_workers_dec(sctx); |
| 4200 | } |
| 4201 | |
Gui Hecheng | 3215924 | 2014-11-10 15:36:08 +0800 | [diff] [blame] | 4202 | static int check_extent_to_block(struct inode *inode, u64 start, u64 len, |
| 4203 | u64 logical) |
| 4204 | { |
| 4205 | struct extent_state *cached_state = NULL; |
| 4206 | struct btrfs_ordered_extent *ordered; |
| 4207 | struct extent_io_tree *io_tree; |
| 4208 | struct extent_map *em; |
| 4209 | u64 lockstart = start, lockend = start + len - 1; |
| 4210 | int ret = 0; |
| 4211 | |
| 4212 | io_tree = &BTRFS_I(inode)->io_tree; |
| 4213 | |
David Sterba | ff13db4 | 2015-12-03 14:30:40 +0100 | [diff] [blame] | 4214 | lock_extent_bits(io_tree, lockstart, lockend, &cached_state); |
Gui Hecheng | 3215924 | 2014-11-10 15:36:08 +0800 | [diff] [blame] | 4215 | ordered = btrfs_lookup_ordered_range(inode, lockstart, len); |
| 4216 | if (ordered) { |
| 4217 | btrfs_put_ordered_extent(ordered); |
| 4218 | ret = 1; |
| 4219 | goto out_unlock; |
| 4220 | } |
| 4221 | |
| 4222 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
| 4223 | if (IS_ERR(em)) { |
| 4224 | ret = PTR_ERR(em); |
| 4225 | goto out_unlock; |
| 4226 | } |
| 4227 | |
| 4228 | /* |
| 4229 | * This extent does not actually cover the logical extent anymore, |
| 4230 | * move on to the next inode. |
| 4231 | */ |
| 4232 | if (em->block_start > logical || |
| 4233 | em->block_start + em->block_len < logical + len) { |
| 4234 | free_extent_map(em); |
| 4235 | ret = 1; |
| 4236 | goto out_unlock; |
| 4237 | } |
| 4238 | free_extent_map(em); |
| 4239 | |
| 4240 | out_unlock: |
| 4241 | unlock_extent_cached(io_tree, lockstart, lockend, &cached_state, |
| 4242 | GFP_NOFS); |
| 4243 | return ret; |
| 4244 | } |
| 4245 | |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4246 | static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, |
| 4247 | struct scrub_copy_nocow_ctx *nocow_ctx) |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4248 | { |
Miao Xie | 826aa0a | 2013-06-27 18:50:59 +0800 | [diff] [blame] | 4249 | struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4250 | struct btrfs_key key; |
Miao Xie | 826aa0a | 2013-06-27 18:50:59 +0800 | [diff] [blame] | 4251 | struct inode *inode; |
| 4252 | struct page *page; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4253 | struct btrfs_root *local_root; |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4254 | struct extent_io_tree *io_tree; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4255 | u64 physical_for_dev_replace; |
Gui Hecheng | 3215924 | 2014-11-10 15:36:08 +0800 | [diff] [blame] | 4256 | u64 nocow_ctx_logical; |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4257 | u64 len = nocow_ctx->len; |
Miao Xie | 826aa0a | 2013-06-27 18:50:59 +0800 | [diff] [blame] | 4258 | unsigned long index; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 4259 | int srcu_index; |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4260 | int ret = 0; |
| 4261 | int err = 0; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4262 | |
| 4263 | key.objectid = root; |
| 4264 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 4265 | key.offset = (u64)-1; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 4266 | |
| 4267 | srcu_index = srcu_read_lock(&fs_info->subvol_srcu); |
| 4268 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4269 | local_root = btrfs_read_fs_root_no_name(fs_info, &key); |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 4270 | if (IS_ERR(local_root)) { |
| 4271 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4272 | return PTR_ERR(local_root); |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 4273 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4274 | |
| 4275 | key.type = BTRFS_INODE_ITEM_KEY; |
| 4276 | key.objectid = inum; |
| 4277 | key.offset = 0; |
| 4278 | inode = btrfs_iget(fs_info->sb, &key, local_root, NULL); |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 4279 | srcu_read_unlock(&fs_info->subvol_srcu, srcu_index); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4280 | if (IS_ERR(inode)) |
| 4281 | return PTR_ERR(inode); |
| 4282 | |
Miao Xie | edd1400 | 2013-06-27 18:51:00 +0800 | [diff] [blame] | 4283 | /* Avoid truncate/dio/punch hole.. */ |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 4284 | inode_lock(inode); |
Miao Xie | edd1400 | 2013-06-27 18:51:00 +0800 | [diff] [blame] | 4285 | inode_dio_wait(inode); |
| 4286 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4287 | physical_for_dev_replace = nocow_ctx->physical_for_dev_replace; |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4288 | io_tree = &BTRFS_I(inode)->io_tree; |
Gui Hecheng | 3215924 | 2014-11-10 15:36:08 +0800 | [diff] [blame] | 4289 | nocow_ctx_logical = nocow_ctx->logical; |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4290 | |
Gui Hecheng | 3215924 | 2014-11-10 15:36:08 +0800 | [diff] [blame] | 4291 | ret = check_extent_to_block(inode, offset, len, nocow_ctx_logical); |
| 4292 | if (ret) { |
| 4293 | ret = ret > 0 ? 0 : ret; |
| 4294 | goto out; |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4295 | } |
| 4296 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4297 | while (len >= PAGE_CACHE_SIZE) { |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4298 | index = offset >> PAGE_CACHE_SHIFT; |
Miao Xie | edd1400 | 2013-06-27 18:51:00 +0800 | [diff] [blame] | 4299 | again: |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4300 | page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
| 4301 | if (!page) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 4302 | btrfs_err(fs_info, "find_or_create_page() failed"); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4303 | ret = -ENOMEM; |
Miao Xie | 826aa0a | 2013-06-27 18:50:59 +0800 | [diff] [blame] | 4304 | goto out; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4305 | } |
| 4306 | |
| 4307 | if (PageUptodate(page)) { |
| 4308 | if (PageDirty(page)) |
| 4309 | goto next_page; |
| 4310 | } else { |
| 4311 | ClearPageError(page); |
Gui Hecheng | 3215924 | 2014-11-10 15:36:08 +0800 | [diff] [blame] | 4312 | err = extent_read_full_page(io_tree, page, |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4313 | btrfs_get_extent, |
| 4314 | nocow_ctx->mirror_num); |
Miao Xie | 826aa0a | 2013-06-27 18:50:59 +0800 | [diff] [blame] | 4315 | if (err) { |
| 4316 | ret = err; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4317 | goto next_page; |
| 4318 | } |
Miao Xie | edd1400 | 2013-06-27 18:51:00 +0800 | [diff] [blame] | 4319 | |
Miao Xie | 26b25891 | 2013-06-27 18:50:58 +0800 | [diff] [blame] | 4320 | lock_page(page); |
Miao Xie | edd1400 | 2013-06-27 18:51:00 +0800 | [diff] [blame] | 4321 | /* |
| 4322 | * If the page has been remove from the page cache, |
| 4323 | * the data on it is meaningless, because it may be |
| 4324 | * old one, the new data may be written into the new |
| 4325 | * page in the page cache. |
| 4326 | */ |
| 4327 | if (page->mapping != inode->i_mapping) { |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4328 | unlock_page(page); |
Miao Xie | edd1400 | 2013-06-27 18:51:00 +0800 | [diff] [blame] | 4329 | page_cache_release(page); |
| 4330 | goto again; |
| 4331 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4332 | if (!PageUptodate(page)) { |
| 4333 | ret = -EIO; |
| 4334 | goto next_page; |
| 4335 | } |
| 4336 | } |
Gui Hecheng | 3215924 | 2014-11-10 15:36:08 +0800 | [diff] [blame] | 4337 | |
| 4338 | ret = check_extent_to_block(inode, offset, len, |
| 4339 | nocow_ctx_logical); |
| 4340 | if (ret) { |
| 4341 | ret = ret > 0 ? 0 : ret; |
| 4342 | goto next_page; |
| 4343 | } |
| 4344 | |
Miao Xie | 826aa0a | 2013-06-27 18:50:59 +0800 | [diff] [blame] | 4345 | err = write_page_nocow(nocow_ctx->sctx, |
| 4346 | physical_for_dev_replace, page); |
| 4347 | if (err) |
| 4348 | ret = err; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4349 | next_page: |
Miao Xie | 826aa0a | 2013-06-27 18:50:59 +0800 | [diff] [blame] | 4350 | unlock_page(page); |
| 4351 | page_cache_release(page); |
| 4352 | |
| 4353 | if (ret) |
| 4354 | break; |
| 4355 | |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4356 | offset += PAGE_CACHE_SIZE; |
| 4357 | physical_for_dev_replace += PAGE_CACHE_SIZE; |
Gui Hecheng | 3215924 | 2014-11-10 15:36:08 +0800 | [diff] [blame] | 4358 | nocow_ctx_logical += PAGE_CACHE_SIZE; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4359 | len -= PAGE_CACHE_SIZE; |
| 4360 | } |
Josef Bacik | 652f25a | 2013-09-12 16:58:28 -0400 | [diff] [blame] | 4361 | ret = COPY_COMPLETE; |
Miao Xie | 826aa0a | 2013-06-27 18:50:59 +0800 | [diff] [blame] | 4362 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 4363 | inode_unlock(inode); |
Miao Xie | 826aa0a | 2013-06-27 18:50:59 +0800 | [diff] [blame] | 4364 | iput(inode); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4365 | return ret; |
| 4366 | } |
| 4367 | |
| 4368 | static int write_page_nocow(struct scrub_ctx *sctx, |
| 4369 | u64 physical_for_dev_replace, struct page *page) |
| 4370 | { |
| 4371 | struct bio *bio; |
| 4372 | struct btrfs_device *dev; |
| 4373 | int ret; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4374 | |
| 4375 | dev = sctx->wr_ctx.tgtdev; |
| 4376 | if (!dev) |
| 4377 | return -EIO; |
| 4378 | if (!dev->bdev) { |
David Sterba | 9464732 | 2015-10-08 11:01:36 +0200 | [diff] [blame] | 4379 | btrfs_warn_rl(dev->dev_root->fs_info, |
| 4380 | "scrub write_page_nocow(bdev == NULL) is unexpected"); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4381 | return -EIO; |
| 4382 | } |
Chris Mason | 9be3395 | 2013-05-17 18:30:14 -0400 | [diff] [blame] | 4383 | bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4384 | if (!bio) { |
| 4385 | spin_lock(&sctx->stat_lock); |
| 4386 | sctx->stat.malloc_errors++; |
| 4387 | spin_unlock(&sctx->stat_lock); |
| 4388 | return -ENOMEM; |
| 4389 | } |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 4390 | bio->bi_iter.bi_size = 0; |
| 4391 | bio->bi_iter.bi_sector = physical_for_dev_replace >> 9; |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4392 | bio->bi_bdev = dev->bdev; |
| 4393 | ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); |
| 4394 | if (ret != PAGE_CACHE_SIZE) { |
| 4395 | leave_with_eio: |
| 4396 | bio_put(bio); |
| 4397 | btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
| 4398 | return -EIO; |
| 4399 | } |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4400 | |
Kent Overstreet | 33879d4 | 2013-11-23 22:33:32 -0800 | [diff] [blame] | 4401 | if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 4402 | goto leave_with_eio; |
| 4403 | |
| 4404 | bio_put(bio); |
| 4405 | return 0; |
| 4406 | } |