Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2 | * linux/include/linux/jbd2.h |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 3 | * |
| 4 | * Written by Stephen C. Tweedie <sct@redhat.com> |
| 5 | * |
| 6 | * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved |
| 7 | * |
| 8 | * This file is part of the Linux kernel and is made available under |
| 9 | * the terms of the GNU General Public License, version 2, or at your |
| 10 | * option, any later version, incorporated herein by reference. |
| 11 | * |
| 12 | * Definitions for transaction data structures for the buffer cache |
| 13 | * filesystem journaling support. |
| 14 | */ |
| 15 | |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 16 | #ifndef _LINUX_JBD2_H |
| 17 | #define _LINUX_JBD2_H |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 18 | |
| 19 | /* Allow this file to be included directly into e2fsprogs */ |
| 20 | #ifndef __KERNEL__ |
| 21 | #include "jfs_compat.h" |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 22 | #define JBD2_DEBUG |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 23 | #else |
| 24 | |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/buffer_head.h> |
| 27 | #include <linux/journal-head.h> |
| 28 | #include <linux/stddef.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 29 | #include <linux/mutex.h> |
| 30 | #include <linux/timer.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 31 | #include <linux/slab.h> |
Darrick J. Wong | 01b5adc | 2012-05-27 07:50:56 -0400 | [diff] [blame] | 32 | #include <crypto/hash.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 33 | #endif |
| 34 | |
| 35 | #define journal_oom_retry 1 |
| 36 | |
| 37 | /* |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 38 | * Define JBD2_PARANIOD_IOFAIL to cause a kernel BUG() if ext4 finds |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 39 | * certain classes of error which can occur due to failed IOs. Under |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 40 | * normal use we want ext4 to continue after such errors, because |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 41 | * hardware _can_ fail, but for debugging purposes when running tests on |
| 42 | * known-good hardware we may want to trap these errors. |
| 43 | */ |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 44 | #undef JBD2_PARANOID_IOFAIL |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 45 | |
| 46 | /* |
| 47 | * The default maximum commit age, in seconds. |
| 48 | */ |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 49 | #define JBD2_DEFAULT_MAX_COMMIT_AGE 5 |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 50 | |
Jose R. Santos | e23291b | 2007-07-18 08:57:06 -0400 | [diff] [blame] | 51 | #ifdef CONFIG_JBD2_DEBUG |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 52 | /* |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 53 | * Define JBD2_EXPENSIVE_CHECKING to enable more expensive internal |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 54 | * consistency checks. By default we don't do this unless |
Jose R. Santos | e23291b | 2007-07-18 08:57:06 -0400 | [diff] [blame] | 55 | * CONFIG_JBD2_DEBUG is on. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 56 | */ |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 57 | #define JBD2_EXPENSIVE_CHECKING |
Theodore Ts'o | b6e96d0 | 2013-02-09 16:29:20 -0500 | [diff] [blame] | 58 | extern ushort jbd2_journal_enable_debug; |
Paul Gortmaker | 169f1a2 | 2013-06-12 23:04:04 -0400 | [diff] [blame] | 59 | void __jbd2_debug(int level, const char *file, const char *func, |
| 60 | unsigned int line, const char *fmt, ...); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 61 | |
Paul Gortmaker | 169f1a2 | 2013-06-12 23:04:04 -0400 | [diff] [blame] | 62 | #define jbd_debug(n, fmt, a...) \ |
| 63 | __jbd2_debug((n), __FILE__, __func__, __LINE__, (fmt), ##a) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 64 | #else |
Paul Gortmaker | 169f1a2 | 2013-06-12 23:04:04 -0400 | [diff] [blame] | 65 | #define jbd_debug(n, fmt, a...) /**/ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 66 | #endif |
| 67 | |
Theodore Ts'o | d2eecb0 | 2009-12-07 10:36:20 -0500 | [diff] [blame] | 68 | extern void *jbd2_alloc(size_t size, gfp_t flags); |
| 69 | extern void jbd2_free(void *ptr, size_t size); |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 70 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 71 | #define JBD2_MIN_JOURNAL_BLOCKS 1024 |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 72 | |
| 73 | #ifdef __KERNEL__ |
| 74 | |
| 75 | /** |
| 76 | * typedef handle_t - The handle_t type represents a single atomic update being performed by some process. |
| 77 | * |
| 78 | * All filesystem modifications made by the process go |
| 79 | * through this handle. Recursive operations (such as quota operations) |
| 80 | * are gathered into a single update. |
| 81 | * |
| 82 | * The buffer credits field is used to account for journaled buffers |
| 83 | * being modified by the running process. To ensure that there is |
| 84 | * enough log space for all outstanding operations, we need to limit the |
| 85 | * number of outstanding buffers possible at any time. When the |
| 86 | * operation completes, any buffer credits not used are credited back to |
| 87 | * the transaction, so that at all times we know how many buffers the |
| 88 | * outstanding updates on a transaction might possibly touch. |
| 89 | * |
| 90 | * This is an opaque datatype. |
| 91 | **/ |
Theodore Ts'o | 8aefcd5 | 2011-01-10 12:29:43 -0500 | [diff] [blame] | 92 | typedef struct jbd2_journal_handle handle_t; /* Atomic operation type */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 93 | |
| 94 | |
| 95 | /** |
| 96 | * typedef journal_t - The journal_t maintains all of the journaling state information for a single filesystem. |
| 97 | * |
| 98 | * journal_t is linked to from the fs superblock structure. |
| 99 | * |
| 100 | * We use the journal_t to keep track of all outstanding transaction |
| 101 | * activity on the filesystem, and to manage the state of the log |
| 102 | * writing process. |
| 103 | * |
| 104 | * This is an opaque datatype. |
| 105 | **/ |
| 106 | typedef struct journal_s journal_t; /* Journal control structure */ |
| 107 | #endif |
| 108 | |
| 109 | /* |
| 110 | * Internal structures used by the logging mechanism: |
| 111 | */ |
| 112 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 113 | #define JBD2_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 114 | |
| 115 | /* |
| 116 | * On-disk structures |
| 117 | */ |
| 118 | |
| 119 | /* |
| 120 | * Descriptor block types: |
| 121 | */ |
| 122 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 123 | #define JBD2_DESCRIPTOR_BLOCK 1 |
| 124 | #define JBD2_COMMIT_BLOCK 2 |
| 125 | #define JBD2_SUPERBLOCK_V1 3 |
| 126 | #define JBD2_SUPERBLOCK_V2 4 |
| 127 | #define JBD2_REVOKE_BLOCK 5 |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 128 | |
| 129 | /* |
| 130 | * Standard header for all descriptor blocks: |
| 131 | */ |
| 132 | typedef struct journal_header_s |
| 133 | { |
| 134 | __be32 h_magic; |
| 135 | __be32 h_blocktype; |
| 136 | __be32 h_sequence; |
| 137 | } journal_header_t; |
| 138 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 139 | /* |
| 140 | * Checksum types. |
| 141 | */ |
| 142 | #define JBD2_CRC32_CHKSUM 1 |
| 143 | #define JBD2_MD5_CHKSUM 2 |
| 144 | #define JBD2_SHA1_CHKSUM 3 |
Darrick J. Wong | 8f888ef | 2012-05-22 22:43:41 -0400 | [diff] [blame] | 145 | #define JBD2_CRC32C_CHKSUM 4 |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 146 | |
| 147 | #define JBD2_CRC32_CHKSUM_SIZE 4 |
| 148 | |
| 149 | #define JBD2_CHECKSUM_BYTES (32 / sizeof(u32)) |
| 150 | /* |
| 151 | * Commit block header for storing transactional checksums: |
Darrick J. Wong | 8f888ef | 2012-05-22 22:43:41 -0400 | [diff] [blame] | 152 | * |
| 153 | * NOTE: If FEATURE_COMPAT_CHECKSUM (checksum v1) is set, the h_chksum* |
| 154 | * fields are used to store a checksum of the descriptor and data blocks. |
| 155 | * |
| 156 | * If FEATURE_INCOMPAT_CSUM_V2 (checksum v2) is set, then the h_chksum |
| 157 | * field is used to store crc32c(uuid+commit_block). Each journal metadata |
| 158 | * block gets its own checksum, and data block checksums are stored in |
| 159 | * journal_block_tag (in the descriptor). The other h_chksum* fields are |
| 160 | * not used. |
| 161 | * |
Darrick J. Wong | db9ee22 | 2014-08-27 18:40:07 -0400 | [diff] [blame] | 162 | * If FEATURE_INCOMPAT_CSUM_V3 is set, the descriptor block uses |
| 163 | * journal_block_tag3_t to store a full 32-bit checksum. Everything else |
| 164 | * is the same as v2. |
| 165 | * |
| 166 | * Checksum v1, v2, and v3 are mutually exclusive features. |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 167 | */ |
| 168 | struct commit_header { |
| 169 | __be32 h_magic; |
| 170 | __be32 h_blocktype; |
| 171 | __be32 h_sequence; |
| 172 | unsigned char h_chksum_type; |
| 173 | unsigned char h_chksum_size; |
| 174 | unsigned char h_padding[2]; |
| 175 | __be32 h_chksum[JBD2_CHECKSUM_BYTES]; |
Theodore Ts'o | 736603a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 176 | __be64 h_commit_sec; |
| 177 | __be32 h_commit_nsec; |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 178 | }; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 179 | |
| 180 | /* |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 181 | * The block tag: used to describe a single buffer in the journal. |
| 182 | * t_blocknr_high is only used if INCOMPAT_64BIT is set, so this |
| 183 | * raw struct shouldn't be used for pointer math or sizeof() - use |
| 184 | * journal_tag_bytes(journal) instead to compute this. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 185 | */ |
Darrick J. Wong | db9ee22 | 2014-08-27 18:40:07 -0400 | [diff] [blame] | 186 | typedef struct journal_block_tag3_s |
| 187 | { |
| 188 | __be32 t_blocknr; /* The on-disk block number */ |
| 189 | __be32 t_flags; /* See below */ |
| 190 | __be32 t_blocknr_high; /* most-significant high 32bits. */ |
| 191 | __be32 t_checksum; /* crc32c(uuid+seq+block) */ |
| 192 | } journal_block_tag3_t; |
| 193 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 194 | typedef struct journal_block_tag_s |
| 195 | { |
| 196 | __be32 t_blocknr; /* The on-disk block number */ |
Darrick J. Wong | 8f888ef | 2012-05-22 22:43:41 -0400 | [diff] [blame] | 197 | __be16 t_checksum; /* truncated crc32c(uuid+seq+block) */ |
| 198 | __be16 t_flags; /* See below */ |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 199 | __be32 t_blocknr_high; /* most-significant high 32bits. */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 200 | } journal_block_tag_t; |
| 201 | |
Darrick J. Wong | 8f888ef | 2012-05-22 22:43:41 -0400 | [diff] [blame] | 202 | /* Tail of descriptor block, for checksumming */ |
| 203 | struct jbd2_journal_block_tail { |
| 204 | __be32 t_checksum; /* crc32c(uuid+descr_block) */ |
| 205 | }; |
| 206 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 207 | /* |
| 208 | * The revoke descriptor: used on disk to describe a series of blocks to |
| 209 | * be revoked from the log |
| 210 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 211 | typedef struct jbd2_journal_revoke_header_s |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 212 | { |
| 213 | journal_header_t r_header; |
| 214 | __be32 r_count; /* Count of bytes used in the block */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 215 | } jbd2_journal_revoke_header_t; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 216 | |
Darrick J. Wong | 8f888ef | 2012-05-22 22:43:41 -0400 | [diff] [blame] | 217 | /* Tail of revoke block, for checksumming */ |
| 218 | struct jbd2_journal_revoke_tail { |
| 219 | __be32 r_checksum; /* crc32c(uuid+revoke_block) */ |
| 220 | }; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 221 | |
| 222 | /* Definitions for the journal tag flags word: */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 223 | #define JBD2_FLAG_ESCAPE 1 /* on-disk block is escaped */ |
| 224 | #define JBD2_FLAG_SAME_UUID 2 /* block has same uuid as previous */ |
| 225 | #define JBD2_FLAG_DELETED 4 /* block deleted by this transaction */ |
| 226 | #define JBD2_FLAG_LAST_TAG 8 /* last tag in this descriptor block */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 227 | |
| 228 | |
| 229 | /* |
| 230 | * The journal superblock. All fields are in big-endian byte order. |
| 231 | */ |
| 232 | typedef struct journal_superblock_s |
| 233 | { |
| 234 | /* 0x0000 */ |
| 235 | journal_header_t s_header; |
| 236 | |
| 237 | /* 0x000C */ |
| 238 | /* Static information describing the journal */ |
| 239 | __be32 s_blocksize; /* journal device blocksize */ |
| 240 | __be32 s_maxlen; /* total blocks in journal file */ |
| 241 | __be32 s_first; /* first block of log information */ |
| 242 | |
| 243 | /* 0x0018 */ |
| 244 | /* Dynamic information describing the current state of the log */ |
| 245 | __be32 s_sequence; /* first commit ID expected in log */ |
| 246 | __be32 s_start; /* blocknr of start of log */ |
| 247 | |
| 248 | /* 0x0020 */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 249 | /* Error value, as set by jbd2_journal_abort(). */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 250 | __be32 s_errno; |
| 251 | |
| 252 | /* 0x0024 */ |
| 253 | /* Remaining fields are only valid in a version-2 superblock */ |
| 254 | __be32 s_feature_compat; /* compatible feature set */ |
| 255 | __be32 s_feature_incompat; /* incompatible feature set */ |
| 256 | __be32 s_feature_ro_compat; /* readonly-compatible feature set */ |
| 257 | /* 0x0030 */ |
| 258 | __u8 s_uuid[16]; /* 128-bit uuid for journal */ |
| 259 | |
| 260 | /* 0x0040 */ |
| 261 | __be32 s_nr_users; /* Nr of filesystems sharing log */ |
| 262 | |
| 263 | __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/ |
| 264 | |
| 265 | /* 0x0048 */ |
| 266 | __be32 s_max_transaction; /* Limit of journal blocks per trans.*/ |
| 267 | __be32 s_max_trans_data; /* Limit of data blocks per trans. */ |
| 268 | |
| 269 | /* 0x0050 */ |
Darrick J. Wong | 8f888ef | 2012-05-22 22:43:41 -0400 | [diff] [blame] | 270 | __u8 s_checksum_type; /* checksum type */ |
| 271 | __u8 s_padding2[3]; |
| 272 | __u32 s_padding[42]; |
| 273 | __be32 s_checksum; /* crc32c(superblock) */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 274 | |
| 275 | /* 0x0100 */ |
| 276 | __u8 s_users[16*48]; /* ids of all fs'es sharing the log */ |
| 277 | /* 0x0400 */ |
| 278 | } journal_superblock_t; |
| 279 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 280 | #define JBD2_HAS_COMPAT_FEATURE(j,mask) \ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 281 | ((j)->j_format_version >= 2 && \ |
| 282 | ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask)))) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 283 | #define JBD2_HAS_RO_COMPAT_FEATURE(j,mask) \ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 284 | ((j)->j_format_version >= 2 && \ |
| 285 | ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask)))) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 286 | #define JBD2_HAS_INCOMPAT_FEATURE(j,mask) \ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 287 | ((j)->j_format_version >= 2 && \ |
| 288 | ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask)))) |
| 289 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 290 | #define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001 |
| 291 | |
| 292 | #define JBD2_FEATURE_INCOMPAT_REVOKE 0x00000001 |
| 293 | #define JBD2_FEATURE_INCOMPAT_64BIT 0x00000002 |
| 294 | #define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004 |
Darrick J. Wong | 8f888ef | 2012-05-22 22:43:41 -0400 | [diff] [blame] | 295 | #define JBD2_FEATURE_INCOMPAT_CSUM_V2 0x00000008 |
Darrick J. Wong | db9ee22 | 2014-08-27 18:40:07 -0400 | [diff] [blame] | 296 | #define JBD2_FEATURE_INCOMPAT_CSUM_V3 0x00000010 |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 297 | |
| 298 | /* Features known to this kernel version: */ |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 299 | #define JBD2_KNOWN_COMPAT_FEATURES JBD2_FEATURE_COMPAT_CHECKSUM |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 300 | #define JBD2_KNOWN_ROCOMPAT_FEATURES 0 |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 301 | #define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE | \ |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 302 | JBD2_FEATURE_INCOMPAT_64BIT | \ |
Darrick J. Wong | e93376c | 2012-05-27 08:12:42 -0400 | [diff] [blame] | 303 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | \ |
Darrick J. Wong | db9ee22 | 2014-08-27 18:40:07 -0400 | [diff] [blame] | 304 | JBD2_FEATURE_INCOMPAT_CSUM_V2 | \ |
| 305 | JBD2_FEATURE_INCOMPAT_CSUM_V3) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 306 | |
| 307 | #ifdef __KERNEL__ |
| 308 | |
| 309 | #include <linux/fs.h> |
| 310 | #include <linux/sched.h> |
Jan Kara | b34090e | 2013-06-04 12:08:56 -0400 | [diff] [blame] | 311 | |
| 312 | enum jbd_state_bits { |
| 313 | BH_JBD /* Has an attached ext3 journal_head */ |
| 314 | = BH_PrivateStart, |
| 315 | BH_JWrite, /* Being written to log (@@@ DEBUGGING) */ |
| 316 | BH_Freed, /* Has been freed (truncated) */ |
| 317 | BH_Revoked, /* Has been revoked from the log */ |
| 318 | BH_RevokeValid, /* Revoked flag is valid */ |
| 319 | BH_JBDDirty, /* Is dirty but journaled */ |
| 320 | BH_State, /* Pins most journal_head state */ |
| 321 | BH_JournalHead, /* Pins bh->b_private and jh->b_bh */ |
| 322 | BH_Shadow, /* IO on shadow buffer is running */ |
| 323 | BH_Verified, /* Metadata block has been verified ok */ |
| 324 | BH_JBDPrivateStart, /* First bit available for private use by FS */ |
| 325 | }; |
| 326 | |
| 327 | BUFFER_FNS(JBD, jbd) |
| 328 | BUFFER_FNS(JWrite, jwrite) |
| 329 | BUFFER_FNS(JBDDirty, jbddirty) |
| 330 | TAS_BUFFER_FNS(JBDDirty, jbddirty) |
| 331 | BUFFER_FNS(Revoked, revoked) |
| 332 | TAS_BUFFER_FNS(Revoked, revoked) |
| 333 | BUFFER_FNS(RevokeValid, revokevalid) |
| 334 | TAS_BUFFER_FNS(RevokeValid, revokevalid) |
| 335 | BUFFER_FNS(Freed, freed) |
| 336 | BUFFER_FNS(Shadow, shadow) |
| 337 | BUFFER_FNS(Verified, verified) |
| 338 | |
Thomas Gleixner | 4460667 | 2011-10-27 04:38:18 -0400 | [diff] [blame] | 339 | #include <linux/jbd_common.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 340 | |
Chris Snook | 36df53f | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 341 | #define J_ASSERT(assert) BUG_ON(!(assert)) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 342 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 343 | #define J_ASSERT_BH(bh, expr) J_ASSERT(expr) |
| 344 | #define J_ASSERT_JH(jh, expr) J_ASSERT(expr) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 345 | |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 346 | #if defined(JBD2_PARANOID_IOFAIL) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 347 | #define J_EXPECT(expr, why...) J_ASSERT(expr) |
| 348 | #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr) |
| 349 | #define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr) |
| 350 | #else |
| 351 | #define __journal_expect(expr, why...) \ |
| 352 | ({ \ |
| 353 | int val = (expr); \ |
| 354 | if (!val) { \ |
| 355 | printk(KERN_ERR \ |
Theodore Ts'o | 08ec8c3 | 2009-01-16 11:57:00 -0500 | [diff] [blame] | 356 | "JBD2 unexpected failure: %s: %s;\n", \ |
| 357 | __func__, #expr); \ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 358 | printk(KERN_ERR why "\n"); \ |
| 359 | } \ |
| 360 | val; \ |
| 361 | }) |
| 362 | #define J_EXPECT(expr, why...) __journal_expect(expr, ## why) |
| 363 | #define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why) |
| 364 | #define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why) |
| 365 | #endif |
| 366 | |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 367 | /* Flags in jbd_inode->i_flags */ |
| 368 | #define __JI_COMMIT_RUNNING 0 |
| 369 | /* Commit of the inode data in progress. We use this flag to protect us from |
| 370 | * concurrent deletion of inode. We cannot use reference to inode for this |
| 371 | * since we cannot afford doing last iput() on behalf of kjournald |
| 372 | */ |
| 373 | #define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING) |
| 374 | |
| 375 | /** |
| 376 | * struct jbd_inode is the structure linking inodes in ordered mode |
| 377 | * present in a transaction so that we can sync them during commit. |
| 378 | */ |
| 379 | struct jbd2_inode { |
| 380 | /* Which transaction does this inode belong to? Either the running |
| 381 | * transaction or the committing one. [j_list_lock] */ |
| 382 | transaction_t *i_transaction; |
| 383 | |
| 384 | /* Pointer to the running transaction modifying inode's data in case |
| 385 | * there is already a committing transaction touching it. [j_list_lock] */ |
| 386 | transaction_t *i_next_transaction; |
| 387 | |
| 388 | /* List of inodes in the i_transaction [j_list_lock] */ |
| 389 | struct list_head i_list; |
| 390 | |
| 391 | /* VFS inode this inode belongs to [constant during the lifetime |
| 392 | * of the structure] */ |
| 393 | struct inode *i_vfs_inode; |
| 394 | |
| 395 | /* Flags of inode [j_list_lock] */ |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 396 | unsigned long i_flags; |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 397 | }; |
| 398 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 399 | struct jbd2_revoke_table_s; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 400 | |
| 401 | /** |
| 402 | * struct handle_s - The handle_s type is the concrete type associated with |
| 403 | * handle_t. |
| 404 | * @h_transaction: Which compound transaction is this update a part of? |
| 405 | * @h_buffer_credits: Number of remaining buffers we are allowed to dirty. |
| 406 | * @h_ref: Reference count on this handle |
| 407 | * @h_err: Field for caller's use to track errors through large fs operations |
| 408 | * @h_sync: flag for sync-on-close |
| 409 | * @h_jdata: flag to force data journaling |
| 410 | * @h_aborted: flag indicating fatal error on handle |
| 411 | **/ |
| 412 | |
| 413 | /* Docbook can't yet cope with the bit fields, but will leave the documentation |
| 414 | * in so it can be fixed later. |
| 415 | */ |
| 416 | |
Theodore Ts'o | 8aefcd5 | 2011-01-10 12:29:43 -0500 | [diff] [blame] | 417 | struct jbd2_journal_handle |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 418 | { |
Jan Kara | 8f7d89f | 2013-06-04 12:35:11 -0400 | [diff] [blame] | 419 | union { |
| 420 | /* Which compound transaction is this update a part of? */ |
| 421 | transaction_t *h_transaction; |
| 422 | /* Which journal handle belongs to - used iff h_reserved set */ |
| 423 | journal_t *h_journal; |
| 424 | }; |
| 425 | |
| 426 | /* Handle reserved for finishing the logical operation */ |
| 427 | handle_t *h_rsv_handle; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 428 | |
| 429 | /* Number of remaining buffers we are allowed to dirty: */ |
| 430 | int h_buffer_credits; |
| 431 | |
| 432 | /* Reference count on this handle */ |
| 433 | int h_ref; |
| 434 | |
| 435 | /* Field for caller's use to track errors through large fs */ |
| 436 | /* operations */ |
| 437 | int h_err; |
| 438 | |
| 439 | /* Flags [no locking] */ |
Theodore Ts'o | 078d503 | 2013-02-07 00:02:15 -0500 | [diff] [blame] | 440 | unsigned int h_sync: 1; /* sync-on-close */ |
| 441 | unsigned int h_jdata: 1; /* force data journaling */ |
Jan Kara | 8f7d89f | 2013-06-04 12:35:11 -0400 | [diff] [blame] | 442 | unsigned int h_reserved: 1; /* handle with reserved credits */ |
Theodore Ts'o | 078d503 | 2013-02-07 00:02:15 -0500 | [diff] [blame] | 443 | unsigned int h_aborted: 1; /* fatal error on handle */ |
Theodore Ts'o | 343d9c2 | 2013-02-08 13:00:22 -0500 | [diff] [blame] | 444 | unsigned int h_type: 8; /* for handle statistics */ |
| 445 | unsigned int h_line_no: 16; /* for handle statistics */ |
| 446 | |
| 447 | unsigned long h_start_jiffies; |
| 448 | unsigned int h_requested_credits; |
Mingming Cao | 7b75106 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 449 | |
| 450 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 451 | struct lockdep_map h_lockdep_map; |
| 452 | #endif |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 453 | }; |
| 454 | |
| 455 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 456 | /* |
| 457 | * Some stats for checkpoint phase |
| 458 | */ |
| 459 | struct transaction_chp_stats_s { |
| 460 | unsigned long cs_chp_time; |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 461 | __u32 cs_forced_to_close; |
| 462 | __u32 cs_written; |
| 463 | __u32 cs_dropped; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 464 | }; |
| 465 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 466 | /* The transaction_t type is the guts of the journaling mechanism. It |
| 467 | * tracks a compound transaction through its various states: |
| 468 | * |
| 469 | * RUNNING: accepting new updates |
| 470 | * LOCKED: Updates still running but we don't accept new ones |
| 471 | * RUNDOWN: Updates are tidying up but have finished requesting |
| 472 | * new buffers to modify (state not used for now) |
| 473 | * FLUSH: All updates complete, but we are still writing to disk |
| 474 | * COMMIT: All data on disk, writing commit record |
| 475 | * FINISHED: We still have to keep the transaction for checkpointing. |
| 476 | * |
| 477 | * The transaction keeps track of all of the buffers modified by a |
| 478 | * running transaction, and all of the buffers committed but not yet |
| 479 | * flushed to home for finished transactions. |
| 480 | */ |
| 481 | |
| 482 | /* |
| 483 | * Lock ranking: |
| 484 | * |
| 485 | * j_list_lock |
| 486 | * ->jbd_lock_bh_journal_head() (This is "innermost") |
| 487 | * |
| 488 | * j_state_lock |
| 489 | * ->jbd_lock_bh_state() |
| 490 | * |
| 491 | * jbd_lock_bh_state() |
| 492 | * ->j_list_lock |
| 493 | * |
| 494 | * j_state_lock |
| 495 | * ->t_handle_lock |
| 496 | * |
| 497 | * j_state_lock |
| 498 | * ->j_list_lock (journal_unmap_buffer) |
| 499 | * |
| 500 | */ |
| 501 | |
| 502 | struct transaction_s |
| 503 | { |
| 504 | /* Pointer to the journal for this transaction. [no locking] */ |
| 505 | journal_t *t_journal; |
| 506 | |
| 507 | /* Sequence number for this transaction [no locking] */ |
| 508 | tid_t t_tid; |
| 509 | |
| 510 | /* |
| 511 | * Transaction's current state |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 512 | * [no locking - only kjournald2 alters this] |
Jan Kara | f5a7a6b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 513 | * [j_list_lock] guards transition of a transaction into T_FINISHED |
| 514 | * state and subsequent call of __jbd2_journal_drop_transaction() |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 515 | * FIXME: needs barriers |
| 516 | * KLUDGE: [use j_state_lock] |
| 517 | */ |
| 518 | enum { |
| 519 | T_RUNNING, |
| 520 | T_LOCKED, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 521 | T_FLUSH, |
| 522 | T_COMMIT, |
Jan Kara | bbd2be3 | 2011-05-24 11:59:18 -0400 | [diff] [blame] | 523 | T_COMMIT_DFLUSH, |
| 524 | T_COMMIT_JFLUSH, |
Dmitry Monakhov | 794446c | 2013-04-03 22:06:52 -0400 | [diff] [blame] | 525 | T_COMMIT_CALLBACK, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 526 | T_FINISHED |
| 527 | } t_state; |
| 528 | |
| 529 | /* |
| 530 | * Where in the log does this transaction's commit start? [no locking] |
| 531 | */ |
| 532 | unsigned long t_log_start; |
| 533 | |
| 534 | /* Number of buffers on the t_buffers list [j_list_lock] */ |
| 535 | int t_nr_buffers; |
| 536 | |
| 537 | /* |
| 538 | * Doubly-linked circular list of all buffers reserved but not yet |
| 539 | * modified by this transaction [j_list_lock] |
| 540 | */ |
| 541 | struct journal_head *t_reserved_list; |
| 542 | |
| 543 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 544 | * Doubly-linked circular list of all metadata buffers owned by this |
| 545 | * transaction [j_list_lock] |
| 546 | */ |
| 547 | struct journal_head *t_buffers; |
| 548 | |
| 549 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 550 | * Doubly-linked circular list of all forget buffers (superseded |
| 551 | * buffers which we can un-checkpoint once this transaction commits) |
| 552 | * [j_list_lock] |
| 553 | */ |
| 554 | struct journal_head *t_forget; |
| 555 | |
| 556 | /* |
| 557 | * Doubly-linked circular list of all buffers still to be flushed before |
| 558 | * this transaction can be checkpointed. [j_list_lock] |
| 559 | */ |
| 560 | struct journal_head *t_checkpoint_list; |
| 561 | |
| 562 | /* |
| 563 | * Doubly-linked circular list of all buffers submitted for IO while |
| 564 | * checkpointing. [j_list_lock] |
| 565 | */ |
| 566 | struct journal_head *t_checkpoint_io_list; |
| 567 | |
| 568 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 569 | * Doubly-linked circular list of metadata buffers being shadowed by log |
| 570 | * IO. The IO buffers on the iobuf list and the shadow buffers on this |
| 571 | * list match each other one for one at all times. [j_list_lock] |
| 572 | */ |
| 573 | struct journal_head *t_shadow_list; |
| 574 | |
| 575 | /* |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 576 | * List of inodes whose data we've modified in data=ordered mode. |
| 577 | * [j_list_lock] |
| 578 | */ |
| 579 | struct list_head t_inode_list; |
| 580 | |
| 581 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 582 | * Protects info related to handles |
| 583 | */ |
| 584 | spinlock_t t_handle_lock; |
| 585 | |
| 586 | /* |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 587 | * Longest time some handle had to wait for running transaction |
| 588 | */ |
| 589 | unsigned long t_max_wait; |
| 590 | |
| 591 | /* |
| 592 | * When transaction started |
| 593 | */ |
| 594 | unsigned long t_start; |
| 595 | |
| 596 | /* |
Theodore Ts'o | 9fff24a | 2013-02-06 22:30:23 -0500 | [diff] [blame] | 597 | * When commit was requested |
| 598 | */ |
| 599 | unsigned long t_requested; |
| 600 | |
| 601 | /* |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 602 | * Checkpointing stats [j_checkpoint_sem] |
| 603 | */ |
| 604 | struct transaction_chp_stats_s t_chp_stats; |
| 605 | |
| 606 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 607 | * Number of outstanding updates running on this transaction |
| 608 | * [t_handle_lock] |
| 609 | */ |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 610 | atomic_t t_updates; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 611 | |
| 612 | /* |
| 613 | * Number of buffers reserved for use by all handles in this transaction |
| 614 | * handle but not yet modified. [t_handle_lock] |
| 615 | */ |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 616 | atomic_t t_outstanding_credits; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 617 | |
| 618 | /* |
| 619 | * Forward and backward links for the circular list of all transactions |
| 620 | * awaiting checkpoint. [j_list_lock] |
| 621 | */ |
| 622 | transaction_t *t_cpnext, *t_cpprev; |
| 623 | |
| 624 | /* |
| 625 | * When will the transaction expire (become due for commit), in jiffies? |
| 626 | * [no locking] |
| 627 | */ |
| 628 | unsigned long t_expires; |
| 629 | |
| 630 | /* |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 631 | * When this transaction started, in nanoseconds [no locking] |
| 632 | */ |
| 633 | ktime_t t_start_time; |
| 634 | |
| 635 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 636 | * How many handles used this transaction? [t_handle_lock] |
| 637 | */ |
Theodore Ts'o | 8dd4204 | 2010-08-03 21:38:29 -0400 | [diff] [blame] | 638 | atomic_t t_handle_count; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 639 | |
Theodore Ts'o | 3e624fc | 2008-10-16 20:00:24 -0400 | [diff] [blame] | 640 | /* |
Theodore Ts'o | 7058548 | 2009-03-25 23:35:46 -0400 | [diff] [blame] | 641 | * This transaction is being forced and some process is |
| 642 | * waiting for it to finish. |
| 643 | */ |
H Hartley Sweeten | 0ccff1a | 2009-08-17 22:38:04 -0400 | [diff] [blame] | 644 | unsigned int t_synchronous_commit:1; |
Jan Kara | 81be12c | 2011-05-24 11:52:40 -0400 | [diff] [blame] | 645 | |
| 646 | /* Disk flush needs to be sent to fs partition [no locking] */ |
| 647 | int t_need_data_flush; |
Theodore Ts'o | 7058548 | 2009-03-25 23:35:46 -0400 | [diff] [blame] | 648 | |
| 649 | /* |
Theodore Ts'o | 3e624fc | 2008-10-16 20:00:24 -0400 | [diff] [blame] | 650 | * For use by the filesystem to store fs-specific data |
| 651 | * structures associated with the transaction |
| 652 | */ |
| 653 | struct list_head t_private_list; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 654 | }; |
| 655 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 656 | struct transaction_run_stats_s { |
| 657 | unsigned long rs_wait; |
Theodore Ts'o | 9fff24a | 2013-02-06 22:30:23 -0500 | [diff] [blame] | 658 | unsigned long rs_request_delay; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 659 | unsigned long rs_running; |
| 660 | unsigned long rs_locked; |
| 661 | unsigned long rs_flushing; |
| 662 | unsigned long rs_logging; |
| 663 | |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 664 | __u32 rs_handle_count; |
| 665 | __u32 rs_blocks; |
| 666 | __u32 rs_blocks_logged; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 667 | }; |
| 668 | |
| 669 | struct transaction_stats_s { |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 670 | unsigned long ts_tid; |
Theodore Ts'o | 9fff24a | 2013-02-06 22:30:23 -0500 | [diff] [blame] | 671 | unsigned long ts_requested; |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 672 | struct transaction_run_stats_s run; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 673 | }; |
| 674 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 675 | static inline unsigned long |
| 676 | jbd2_time_diff(unsigned long start, unsigned long end) |
| 677 | { |
| 678 | if (end >= start) |
| 679 | return end - start; |
| 680 | |
| 681 | return end + (MAX_JIFFY_OFFSET - start); |
| 682 | } |
| 683 | |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 684 | #define JBD2_NR_BATCH 64 |
| 685 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 686 | /** |
| 687 | * struct journal_s - The journal_s type is the concrete type associated with |
| 688 | * journal_t. |
| 689 | * @j_flags: General journaling state flags |
| 690 | * @j_errno: Is there an outstanding uncleared error on the journal (from a |
| 691 | * prior abort)? |
| 692 | * @j_sb_buffer: First part of superblock buffer |
| 693 | * @j_superblock: Second part of superblock buffer |
| 694 | * @j_format_version: Version of the superblock format |
| 695 | * @j_state_lock: Protect the various scalars in the journal |
| 696 | * @j_barrier_count: Number of processes waiting to create a barrier lock |
| 697 | * @j_barrier: The barrier lock itself |
| 698 | * @j_running_transaction: The current running transaction.. |
| 699 | * @j_committing_transaction: the transaction we are pushing to disk |
| 700 | * @j_checkpoint_transactions: a linked circular list of all transactions |
| 701 | * waiting for checkpointing |
| 702 | * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction |
| 703 | * to start committing, or for a barrier lock to be released |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 704 | * @j_wait_done_commit: Wait queue for waiting for commit to complete |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 705 | * @j_wait_commit: Wait queue to trigger commit |
| 706 | * @j_wait_updates: Wait queue to wait for updates to complete |
Jan Kara | 8f7d89f | 2013-06-04 12:35:11 -0400 | [diff] [blame] | 707 | * @j_wait_reserved: Wait queue to wait for reserved buffer credits to drop |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 708 | * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints |
| 709 | * @j_head: Journal head - identifies the first unused block in the journal |
| 710 | * @j_tail: Journal tail - identifies the oldest still-used block in the |
| 711 | * journal. |
| 712 | * @j_free: Journal free - how many free blocks are there in the journal? |
| 713 | * @j_first: The block number of the first usable block |
| 714 | * @j_last: The block number one beyond the last usable block |
| 715 | * @j_dev: Device where we store the journal |
| 716 | * @j_blocksize: blocksize for the location where we store the journal. |
| 717 | * @j_blk_offset: starting block offset for into the device where we store the |
| 718 | * journal |
| 719 | * @j_fs_dev: Device which holds the client fs. For internal journal this will |
| 720 | * be equal to j_dev |
Jan Kara | 8f7d89f | 2013-06-04 12:35:11 -0400 | [diff] [blame] | 721 | * @j_reserved_credits: Number of buffers reserved from the running transaction |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 722 | * @j_maxlen: Total maximum capacity of the journal region on disk. |
| 723 | * @j_list_lock: Protects the buffer lists and internal buffer state. |
| 724 | * @j_inode: Optional inode where we store the journal. If present, all journal |
| 725 | * block numbers are mapped into this inode via bmap(). |
| 726 | * @j_tail_sequence: Sequence number of the oldest transaction in the log |
| 727 | * @j_transaction_sequence: Sequence number of the next transaction to grant |
| 728 | * @j_commit_sequence: Sequence number of the most recently committed |
| 729 | * transaction |
| 730 | * @j_commit_request: Sequence number of the most recent transaction wanting |
| 731 | * commit |
| 732 | * @j_uuid: Uuid of client object. |
| 733 | * @j_task: Pointer to the current commit thread for this journal |
| 734 | * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a |
| 735 | * single compound commit transaction |
| 736 | * @j_commit_interval: What is the maximum transaction lifetime before we begin |
| 737 | * a commit? |
| 738 | * @j_commit_timer: The timer used to wakeup the commit thread |
| 739 | * @j_revoke_lock: Protect the revoke table |
| 740 | * @j_revoke: The revoke table - maintains the list of revoked blocks in the |
| 741 | * current transaction. |
| 742 | * @j_revoke_table: alternate revoke tables for j_revoke |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 743 | * @j_wbuf: array of buffer_heads for jbd2_journal_commit_transaction |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 744 | * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the |
| 745 | * number that will fit in j_blocksize |
| 746 | * @j_last_sync_writer: most recent pid which did a synchronous write |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 747 | * @j_history: Buffer storing the transactions statistics history |
| 748 | * @j_history_max: Maximum number of transactions in the statistics history |
| 749 | * @j_history_cur: Current number of transactions in the statistics history |
| 750 | * @j_history_lock: Protect the transactions statistics history |
| 751 | * @j_proc_entry: procfs entry for the jbd statistics directory |
| 752 | * @j_stats: Overall statistics |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 753 | * @j_private: An opaque pointer to fs-private information. |
| 754 | */ |
| 755 | |
| 756 | struct journal_s |
| 757 | { |
| 758 | /* General journaling state flags [j_state_lock] */ |
| 759 | unsigned long j_flags; |
| 760 | |
| 761 | /* |
| 762 | * Is there an outstanding uncleared error on the journal (from a prior |
| 763 | * abort)? [j_state_lock] |
| 764 | */ |
| 765 | int j_errno; |
| 766 | |
| 767 | /* The superblock buffer */ |
| 768 | struct buffer_head *j_sb_buffer; |
| 769 | journal_superblock_t *j_superblock; |
| 770 | |
| 771 | /* Version of the superblock format */ |
| 772 | int j_format_version; |
| 773 | |
| 774 | /* |
| 775 | * Protect the various scalars in the journal |
| 776 | */ |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 777 | rwlock_t j_state_lock; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 778 | |
| 779 | /* |
| 780 | * Number of processes waiting to create a barrier lock [j_state_lock] |
| 781 | */ |
| 782 | int j_barrier_count; |
| 783 | |
| 784 | /* The barrier lock itself */ |
| 785 | struct mutex j_barrier; |
| 786 | |
| 787 | /* |
| 788 | * Transactions: The current running transaction... |
| 789 | * [j_state_lock] [caller holding open handle] |
| 790 | */ |
| 791 | transaction_t *j_running_transaction; |
| 792 | |
| 793 | /* |
| 794 | * the transaction we are pushing to disk |
| 795 | * [j_state_lock] [caller holding open handle] |
| 796 | */ |
| 797 | transaction_t *j_committing_transaction; |
| 798 | |
| 799 | /* |
| 800 | * ... and a linked circular list of all transactions waiting for |
| 801 | * checkpointing. [j_list_lock] |
| 802 | */ |
| 803 | transaction_t *j_checkpoint_transactions; |
| 804 | |
| 805 | /* |
| 806 | * Wait queue for waiting for a locked transaction to start committing, |
| 807 | * or for a barrier lock to be released |
| 808 | */ |
| 809 | wait_queue_head_t j_wait_transaction_locked; |
| 810 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 811 | /* Wait queue for waiting for commit to complete */ |
| 812 | wait_queue_head_t j_wait_done_commit; |
| 813 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 814 | /* Wait queue to trigger commit */ |
| 815 | wait_queue_head_t j_wait_commit; |
| 816 | |
| 817 | /* Wait queue to wait for updates to complete */ |
| 818 | wait_queue_head_t j_wait_updates; |
| 819 | |
Jan Kara | 8f7d89f | 2013-06-04 12:35:11 -0400 | [diff] [blame] | 820 | /* Wait queue to wait for reserved buffer credits to drop */ |
| 821 | wait_queue_head_t j_wait_reserved; |
| 822 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 823 | /* Semaphore for locking against concurrent checkpoints */ |
| 824 | struct mutex j_checkpoint_mutex; |
| 825 | |
| 826 | /* |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 827 | * List of buffer heads used by the checkpoint routine. This |
| 828 | * was moved from jbd2_log_do_checkpoint() to reduce stack |
| 829 | * usage. Access to this array is controlled by the |
| 830 | * j_checkpoint_mutex. [j_checkpoint_mutex] |
| 831 | */ |
| 832 | struct buffer_head *j_chkpt_bhs[JBD2_NR_BATCH]; |
| 833 | |
| 834 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 835 | * Journal head: identifies the first unused block in the journal. |
| 836 | * [j_state_lock] |
| 837 | */ |
| 838 | unsigned long j_head; |
| 839 | |
| 840 | /* |
| 841 | * Journal tail: identifies the oldest still-used block in the journal. |
| 842 | * [j_state_lock] |
| 843 | */ |
| 844 | unsigned long j_tail; |
| 845 | |
| 846 | /* |
| 847 | * Journal free: how many free blocks are there in the journal? |
| 848 | * [j_state_lock] |
| 849 | */ |
| 850 | unsigned long j_free; |
| 851 | |
| 852 | /* |
| 853 | * Journal start and end: the block numbers of the first usable block |
| 854 | * and one beyond the last usable block in the journal. [j_state_lock] |
| 855 | */ |
| 856 | unsigned long j_first; |
| 857 | unsigned long j_last; |
| 858 | |
| 859 | /* |
| 860 | * Device, blocksize and starting block offset for the location where we |
| 861 | * store the journal. |
| 862 | */ |
| 863 | struct block_device *j_dev; |
| 864 | int j_blocksize; |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 865 | unsigned long long j_blk_offset; |
| 866 | char j_devname[BDEVNAME_SIZE+24]; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 867 | |
| 868 | /* |
| 869 | * Device which holds the client fs. For internal journal this will be |
| 870 | * equal to j_dev. |
| 871 | */ |
| 872 | struct block_device *j_fs_dev; |
| 873 | |
| 874 | /* Total maximum capacity of the journal region on disk. */ |
| 875 | unsigned int j_maxlen; |
| 876 | |
Jan Kara | 8f7d89f | 2013-06-04 12:35:11 -0400 | [diff] [blame] | 877 | /* Number of buffers reserved from the running transaction */ |
| 878 | atomic_t j_reserved_credits; |
| 879 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 880 | /* |
| 881 | * Protects the buffer lists and internal buffer state. |
| 882 | */ |
| 883 | spinlock_t j_list_lock; |
| 884 | |
| 885 | /* Optional inode where we store the journal. If present, all */ |
| 886 | /* journal block numbers are mapped into this inode via */ |
| 887 | /* bmap(). */ |
| 888 | struct inode *j_inode; |
| 889 | |
| 890 | /* |
| 891 | * Sequence number of the oldest transaction in the log [j_state_lock] |
| 892 | */ |
| 893 | tid_t j_tail_sequence; |
| 894 | |
| 895 | /* |
| 896 | * Sequence number of the next transaction to grant [j_state_lock] |
| 897 | */ |
| 898 | tid_t j_transaction_sequence; |
| 899 | |
| 900 | /* |
| 901 | * Sequence number of the most recently committed transaction |
| 902 | * [j_state_lock]. |
| 903 | */ |
| 904 | tid_t j_commit_sequence; |
| 905 | |
| 906 | /* |
| 907 | * Sequence number of the most recent transaction wanting commit |
| 908 | * [j_state_lock] |
| 909 | */ |
| 910 | tid_t j_commit_request; |
| 911 | |
| 912 | /* |
| 913 | * Journal uuid: identifies the object (filesystem, LVM volume etc) |
| 914 | * backed by this journal. This will eventually be replaced by an array |
| 915 | * of uuids, allowing us to index multiple devices within a single |
| 916 | * journal and to perform atomic updates across them. |
| 917 | */ |
| 918 | __u8 j_uuid[16]; |
| 919 | |
| 920 | /* Pointer to the current commit thread for this journal */ |
| 921 | struct task_struct *j_task; |
| 922 | |
| 923 | /* |
| 924 | * Maximum number of metadata buffers to allow in a single compound |
| 925 | * commit transaction |
| 926 | */ |
| 927 | int j_max_transaction_buffers; |
| 928 | |
| 929 | /* |
| 930 | * What is the maximum transaction lifetime before we begin a commit? |
| 931 | */ |
| 932 | unsigned long j_commit_interval; |
| 933 | |
| 934 | /* The timer used to wakeup the commit thread: */ |
| 935 | struct timer_list j_commit_timer; |
| 936 | |
| 937 | /* |
| 938 | * The revoke table: maintains the list of revoked blocks in the |
| 939 | * current transaction. [j_revoke_lock] |
| 940 | */ |
| 941 | spinlock_t j_revoke_lock; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 942 | struct jbd2_revoke_table_s *j_revoke; |
| 943 | struct jbd2_revoke_table_s *j_revoke_table[2]; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 944 | |
| 945 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 946 | * array of bhs for jbd2_journal_commit_transaction |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 947 | */ |
| 948 | struct buffer_head **j_wbuf; |
| 949 | int j_wbufsize; |
| 950 | |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 951 | /* |
| 952 | * this is the pid of hte last person to run a synchronous operation |
| 953 | * through the journal |
| 954 | */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 955 | pid_t j_last_sync_writer; |
| 956 | |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 957 | /* |
| 958 | * the average amount of time in nanoseconds it takes to commit a |
| 959 | * transaction to disk. [j_state_lock] |
| 960 | */ |
| 961 | u64 j_average_commit_time; |
| 962 | |
Theodore Ts'o | 3077384 | 2009-01-03 20:27:38 -0500 | [diff] [blame] | 963 | /* |
| 964 | * minimum and maximum times that we should wait for |
| 965 | * additional filesystem operations to get batched into a |
| 966 | * synchronous handle in microseconds |
| 967 | */ |
| 968 | u32 j_min_batch_time; |
| 969 | u32 j_max_batch_time; |
| 970 | |
Theodore Ts'o | 3e624fc | 2008-10-16 20:00:24 -0400 | [diff] [blame] | 971 | /* This function is called when a transaction is closed */ |
| 972 | void (*j_commit_callback)(journal_t *, |
| 973 | transaction_t *); |
| 974 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 975 | /* |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 976 | * Journal statistics |
| 977 | */ |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 978 | spinlock_t j_history_lock; |
| 979 | struct proc_dir_entry *j_proc_entry; |
| 980 | struct transaction_stats_s j_stats; |
| 981 | |
Theodore Ts'o | 624080e | 2008-06-06 17:50:40 -0400 | [diff] [blame] | 982 | /* Failed journal commit ID */ |
| 983 | unsigned int j_failed_commit; |
| 984 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 985 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 986 | * An opaque pointer to fs-private information. ext3 puts its |
| 987 | * superblock pointer here |
| 988 | */ |
| 989 | void *j_private; |
Darrick J. Wong | 01b5adc | 2012-05-27 07:50:56 -0400 | [diff] [blame] | 990 | |
| 991 | /* Reference to checksum algorithm driver via cryptoapi */ |
| 992 | struct crypto_shash *j_chksum_driver; |
Darrick J. Wong | 4fd5ea4 | 2012-05-27 08:08:22 -0400 | [diff] [blame] | 993 | |
| 994 | /* Precomputed journal UUID checksum for seeding other checksums */ |
| 995 | __u32 j_csum_seed; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 996 | }; |
| 997 | |
| 998 | /* |
| 999 | * Journal flag definitions |
| 1000 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1001 | #define JBD2_UNMOUNT 0x001 /* Journal thread is being destroyed */ |
| 1002 | #define JBD2_ABORT 0x002 /* Journaling has been aborted for errors. */ |
| 1003 | #define JBD2_ACK_ERR 0x004 /* The errno in the sb has been acked */ |
| 1004 | #define JBD2_FLUSHED 0x008 /* The journal superblock has been flushed */ |
| 1005 | #define JBD2_LOADED 0x010 /* The journal superblock has been loaded */ |
| 1006 | #define JBD2_BARRIER 0x020 /* Use IDE barriers */ |
Hidehiro Kawai | 5bf5683 | 2008-10-10 22:12:43 -0400 | [diff] [blame] | 1007 | #define JBD2_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file |
| 1008 | * data write error in ordered |
| 1009 | * mode */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1010 | |
| 1011 | /* |
| 1012 | * Function declarations for the journaling transaction and buffer |
| 1013 | * management |
| 1014 | */ |
| 1015 | |
| 1016 | /* Filing buffers */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1017 | extern void jbd2_journal_unfile_buffer(journal_t *, struct journal_head *); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1018 | extern void __jbd2_journal_refile_buffer(struct journal_head *); |
| 1019 | extern void jbd2_journal_refile_buffer(journal_t *, struct journal_head *); |
| 1020 | extern void __jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1021 | extern void __journal_free_buffer(struct journal_head *bh); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1022 | extern void jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1023 | extern void __journal_clean_data_list(transaction_t *transaction); |
Jan Kara | f5113ef | 2013-06-04 12:01:45 -0400 | [diff] [blame] | 1024 | static inline void jbd2_file_log_bh(struct list_head *head, struct buffer_head *bh) |
| 1025 | { |
| 1026 | list_add_tail(&bh->b_assoc_buffers, head); |
| 1027 | } |
| 1028 | static inline void jbd2_unfile_log_bh(struct buffer_head *bh) |
| 1029 | { |
| 1030 | list_del_init(&bh->b_assoc_buffers); |
| 1031 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1032 | |
| 1033 | /* Log buffer allocation */ |
Jan Kara | e5a120a | 2013-06-04 12:06:01 -0400 | [diff] [blame] | 1034 | struct buffer_head *jbd2_journal_get_descriptor_buffer(journal_t *journal); |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 1035 | int jbd2_journal_next_log_block(journal_t *, unsigned long long *); |
Jan Kara | 79feb52 | 2012-03-13 22:22:54 -0400 | [diff] [blame] | 1036 | int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid, |
| 1037 | unsigned long *block); |
| 1038 | void __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block); |
Jan Kara | 3339578 | 2012-03-13 22:45:38 -0400 | [diff] [blame] | 1039 | void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1040 | |
| 1041 | /* Commit management */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1042 | extern void jbd2_journal_commit_transaction(journal_t *); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1043 | |
| 1044 | /* Checkpoint list management */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1045 | int __jbd2_journal_clean_checkpoint_list(journal_t *journal); |
| 1046 | int __jbd2_journal_remove_checkpoint(struct journal_head *); |
| 1047 | void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1048 | |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 1049 | |
| 1050 | /* |
| 1051 | * Triggers |
| 1052 | */ |
| 1053 | |
| 1054 | struct jbd2_buffer_trigger_type { |
| 1055 | /* |
Jan Kara | 13ceef0 | 2010-07-14 07:56:33 +0200 | [diff] [blame] | 1056 | * Fired a the moment data to write to the journal are known to be |
| 1057 | * stable - so either at the moment b_frozen_data is created or just |
| 1058 | * before a buffer is written to the journal. mapped_data is a mapped |
| 1059 | * buffer that is the frozen data for commit. |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 1060 | */ |
Jan Kara | 13ceef0 | 2010-07-14 07:56:33 +0200 | [diff] [blame] | 1061 | void (*t_frozen)(struct jbd2_buffer_trigger_type *type, |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 1062 | struct buffer_head *bh, void *mapped_data, |
| 1063 | size_t size); |
| 1064 | |
| 1065 | /* |
| 1066 | * Fired during journal abort for dirty buffers that will not be |
| 1067 | * committed. |
| 1068 | */ |
| 1069 | void (*t_abort)(struct jbd2_buffer_trigger_type *type, |
| 1070 | struct buffer_head *bh); |
| 1071 | }; |
| 1072 | |
Jan Kara | 13ceef0 | 2010-07-14 07:56:33 +0200 | [diff] [blame] | 1073 | extern void jbd2_buffer_frozen_trigger(struct journal_head *jh, |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 1074 | void *mapped_data, |
| 1075 | struct jbd2_buffer_trigger_type *triggers); |
| 1076 | extern void jbd2_buffer_abort_trigger(struct journal_head *jh, |
| 1077 | struct jbd2_buffer_trigger_type *triggers); |
| 1078 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1079 | /* Buffer IO */ |
Jan Kara | f5113ef | 2013-06-04 12:01:45 -0400 | [diff] [blame] | 1080 | extern int jbd2_journal_write_metadata_buffer(transaction_t *transaction, |
| 1081 | struct journal_head *jh_in, |
| 1082 | struct buffer_head **bh_out, |
| 1083 | sector_t blocknr); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1084 | |
| 1085 | /* Transaction locking */ |
| 1086 | extern void __wait_on_journal (journal_t *); |
| 1087 | |
Yongqiang Yang | 0c2022e | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 1088 | /* Transaction cache support */ |
| 1089 | extern void jbd2_journal_destroy_transaction_cache(void); |
| 1090 | extern int jbd2_journal_init_transaction_cache(void); |
| 1091 | extern void jbd2_journal_free_transaction(transaction_t *); |
| 1092 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1093 | /* |
| 1094 | * Journal locking. |
| 1095 | * |
| 1096 | * We need to lock the journal during transaction state changes so that nobody |
| 1097 | * ever tries to take a handle on the running transaction while we are in the |
| 1098 | * middle of moving it to the commit phase. j_state_lock does this. |
| 1099 | * |
| 1100 | * Note that the locking is completely interrupt unsafe. We never touch |
| 1101 | * journal structures from interrupts. |
| 1102 | */ |
| 1103 | |
| 1104 | static inline handle_t *journal_current_handle(void) |
| 1105 | { |
| 1106 | return current->journal_info; |
| 1107 | } |
| 1108 | |
| 1109 | /* The journaling code user interface: |
| 1110 | * |
| 1111 | * Create and destroy handles |
| 1112 | * Register buffer modifications against the current transaction. |
| 1113 | */ |
| 1114 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1115 | extern handle_t *jbd2_journal_start(journal_t *, int nblocks); |
Jan Kara | 8f7d89f | 2013-06-04 12:35:11 -0400 | [diff] [blame] | 1116 | extern handle_t *jbd2__journal_start(journal_t *, int blocks, int rsv_blocks, |
| 1117 | gfp_t gfp_mask, unsigned int type, |
| 1118 | unsigned int line_no); |
Theodore Ts'o | 47def82 | 2010-07-27 11:56:05 -0400 | [diff] [blame] | 1119 | extern int jbd2_journal_restart(handle_t *, int nblocks); |
Dan Carpenter | d2159fb | 2011-09-04 10:20:14 -0400 | [diff] [blame] | 1120 | extern int jbd2__journal_restart(handle_t *, int nblocks, gfp_t gfp_mask); |
Jan Kara | 8f7d89f | 2013-06-04 12:35:11 -0400 | [diff] [blame] | 1121 | extern int jbd2_journal_start_reserved(handle_t *handle, |
| 1122 | unsigned int type, unsigned int line_no); |
| 1123 | extern void jbd2_journal_free_reserved(handle_t *handle); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1124 | extern int jbd2_journal_extend (handle_t *, int nblocks); |
| 1125 | extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *); |
| 1126 | extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *); |
| 1127 | extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *); |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 1128 | void jbd2_journal_set_triggers(struct buffer_head *, |
| 1129 | struct jbd2_buffer_trigger_type *type); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1130 | extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1131 | extern int jbd2_journal_forget (handle_t *, struct buffer_head *); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1132 | extern void journal_sync_buffer (struct buffer_head *); |
Jan Kara | 53e8726 | 2012-12-25 13:29:52 -0500 | [diff] [blame] | 1133 | extern int jbd2_journal_invalidatepage(journal_t *, |
Lukas Czerner | 259709b | 2013-05-21 23:20:03 -0400 | [diff] [blame] | 1134 | struct page *, unsigned int, unsigned int); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1135 | extern int jbd2_journal_try_to_free_buffers(journal_t *, struct page *, gfp_t); |
| 1136 | extern int jbd2_journal_stop(handle_t *); |
| 1137 | extern int jbd2_journal_flush (journal_t *); |
| 1138 | extern void jbd2_journal_lock_updates (journal_t *); |
| 1139 | extern void jbd2_journal_unlock_updates (journal_t *); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1140 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1141 | extern journal_t * jbd2_journal_init_dev(struct block_device *bdev, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1142 | struct block_device *fs_dev, |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 1143 | unsigned long long start, int len, int bsize); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1144 | extern journal_t * jbd2_journal_init_inode (struct inode *); |
| 1145 | extern int jbd2_journal_update_format (journal_t *); |
| 1146 | extern int jbd2_journal_check_used_features |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1147 | (journal_t *, unsigned long, unsigned long, unsigned long); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1148 | extern int jbd2_journal_check_available_features |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1149 | (journal_t *, unsigned long, unsigned long, unsigned long); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1150 | extern int jbd2_journal_set_features |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1151 | (journal_t *, unsigned long, unsigned long, unsigned long); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1152 | extern void jbd2_journal_clear_features |
| 1153 | (journal_t *, unsigned long, unsigned long, unsigned long); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1154 | extern int jbd2_journal_load (journal_t *journal); |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1155 | extern int jbd2_journal_destroy (journal_t *); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1156 | extern int jbd2_journal_recover (journal_t *journal); |
| 1157 | extern int jbd2_journal_wipe (journal_t *, int); |
| 1158 | extern int jbd2_journal_skip_recovery (journal_t *); |
Theodore Ts'o | d796c52 | 2012-08-05 19:04:57 -0400 | [diff] [blame] | 1159 | extern void jbd2_journal_update_sb_errno(journal_t *); |
Jan Kara | 79feb52 | 2012-03-13 22:22:54 -0400 | [diff] [blame] | 1160 | extern void jbd2_journal_update_sb_log_tail (journal_t *, tid_t, |
| 1161 | unsigned long, int); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1162 | extern void __jbd2_journal_abort_hard (journal_t *); |
| 1163 | extern void jbd2_journal_abort (journal_t *, int); |
| 1164 | extern int jbd2_journal_errno (journal_t *); |
| 1165 | extern void jbd2_journal_ack_err (journal_t *); |
| 1166 | extern int jbd2_journal_clear_err (journal_t *); |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 1167 | extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1168 | extern int jbd2_journal_force_commit(journal_t *); |
Dmitry Monakhov | 9ff8644 | 2013-06-12 22:24:07 -0400 | [diff] [blame] | 1169 | extern int jbd2_journal_force_commit_nested(journal_t *); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1170 | extern int jbd2_journal_file_inode(handle_t *handle, struct jbd2_inode *inode); |
Jan Kara | 7f5aa21 | 2009-02-10 11:15:34 -0500 | [diff] [blame] | 1171 | extern int jbd2_journal_begin_ordered_truncate(journal_t *journal, |
| 1172 | struct jbd2_inode *inode, loff_t new_size); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1173 | extern void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode); |
| 1174 | extern void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1175 | |
| 1176 | /* |
| 1177 | * journal_head management |
| 1178 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1179 | struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh); |
| 1180 | struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1181 | void jbd2_journal_put_journal_head(struct journal_head *jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1182 | |
| 1183 | /* |
| 1184 | * handle management |
| 1185 | */ |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 1186 | extern struct kmem_cache *jbd2_handle_cache; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1187 | |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1188 | static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1189 | { |
Zheng Liu | 28daf4f | 2013-04-19 17:49:23 -0400 | [diff] [blame] | 1190 | return kmem_cache_zalloc(jbd2_handle_cache, gfp_flags); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1191 | } |
| 1192 | |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1193 | static inline void jbd2_free_handle(handle_t *handle) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1194 | { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1195 | kmem_cache_free(jbd2_handle_cache, handle); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1196 | } |
| 1197 | |
Theodore Ts'o | 8aefcd5 | 2011-01-10 12:29:43 -0500 | [diff] [blame] | 1198 | /* |
| 1199 | * jbd2_inode management (optional, for those file systems that want to use |
| 1200 | * dynamically allocated jbd2_inode structures) |
| 1201 | */ |
| 1202 | extern struct kmem_cache *jbd2_inode_cache; |
| 1203 | |
| 1204 | static inline struct jbd2_inode *jbd2_alloc_inode(gfp_t gfp_flags) |
| 1205 | { |
| 1206 | return kmem_cache_alloc(jbd2_inode_cache, gfp_flags); |
| 1207 | } |
| 1208 | |
| 1209 | static inline void jbd2_free_inode(struct jbd2_inode *jinode) |
| 1210 | { |
| 1211 | kmem_cache_free(jbd2_inode_cache, jinode); |
| 1212 | } |
| 1213 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1214 | /* Primary revoke support */ |
| 1215 | #define JOURNAL_REVOKE_DEFAULT_HASH 256 |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1216 | extern int jbd2_journal_init_revoke(journal_t *, int); |
| 1217 | extern void jbd2_journal_destroy_revoke_caches(void); |
| 1218 | extern int jbd2_journal_init_revoke_caches(void); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1219 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1220 | extern void jbd2_journal_destroy_revoke(journal_t *); |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 1221 | extern int jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1222 | extern int jbd2_journal_cancel_revoke(handle_t *, struct journal_head *); |
Jan Kara | e5a120a | 2013-06-04 12:06:01 -0400 | [diff] [blame] | 1223 | extern void jbd2_journal_write_revoke_records(journal_t *journal, |
| 1224 | transaction_t *transaction, |
| 1225 | struct list_head *log_bufs, |
| 1226 | int write_op); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1227 | |
| 1228 | /* Recovery revoke support */ |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 1229 | extern int jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t); |
| 1230 | extern int jbd2_journal_test_revoke(journal_t *, unsigned long long, tid_t); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1231 | extern void jbd2_journal_clear_revoke(journal_t *); |
| 1232 | extern void jbd2_journal_switch_revoke_table(journal_t *journal); |
Yongqiang Yang | 1ba3726 | 2011-12-28 17:46:46 -0500 | [diff] [blame] | 1233 | extern void jbd2_clear_buffer_revoked_flags(journal_t *journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1234 | |
| 1235 | /* |
| 1236 | * The log thread user interface: |
| 1237 | * |
| 1238 | * Request space in the current transaction, and force transaction commit |
| 1239 | * transitions on demand. |
| 1240 | */ |
| 1241 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1242 | int jbd2_log_start_commit(journal_t *journal, tid_t tid); |
| 1243 | int __jbd2_log_start_commit(journal_t *journal, tid_t tid); |
| 1244 | int jbd2_journal_start_commit(journal_t *journal, tid_t *tid); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1245 | int jbd2_log_wait_commit(journal_t *journal, tid_t tid); |
Theodore Ts'o | d76a3a77 | 2013-04-03 22:02:52 -0400 | [diff] [blame] | 1246 | int jbd2_complete_transaction(journal_t *journal, tid_t tid); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1247 | int jbd2_log_do_checkpoint(journal_t *journal); |
Jan Kara | bbd2be3 | 2011-05-24 11:59:18 -0400 | [diff] [blame] | 1248 | int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1249 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1250 | void __jbd2_log_wait_for_space(journal_t *journal); |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 1251 | extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *); |
| 1252 | extern int jbd2_cleanup_journal_tail(journal_t *); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1253 | |
| 1254 | /* Debugging code only: */ |
| 1255 | |
| 1256 | #define jbd_ENOSYS() \ |
| 1257 | do { \ |
Harvey Harrison | d5c003b | 2008-10-15 22:01:24 -0700 | [diff] [blame] | 1258 | printk (KERN_ERR "JBD unimplemented function %s\n", __func__); \ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1259 | current->state = TASK_UNINTERRUPTIBLE; \ |
| 1260 | schedule(); \ |
| 1261 | } while (1) |
| 1262 | |
| 1263 | /* |
| 1264 | * is_journal_abort |
| 1265 | * |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1266 | * Simple test wrapper function to test the JBD2_ABORT state flag. This |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1267 | * bit, when set, indicates that we have had a fatal error somewhere, |
| 1268 | * either inside the journaling layer or indicated to us by the client |
| 1269 | * (eg. ext3), and that we and should not commit any further |
| 1270 | * transactions. |
| 1271 | */ |
| 1272 | |
| 1273 | static inline int is_journal_aborted(journal_t *journal) |
| 1274 | { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1275 | return journal->j_flags & JBD2_ABORT; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1276 | } |
| 1277 | |
| 1278 | static inline int is_handle_aborted(handle_t *handle) |
| 1279 | { |
Theodore Ts'o | 41a5b91 | 2013-07-01 08:12:41 -0400 | [diff] [blame] | 1280 | if (handle->h_aborted || !handle->h_transaction) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1281 | return 1; |
| 1282 | return is_journal_aborted(handle->h_transaction->t_journal); |
| 1283 | } |
| 1284 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1285 | static inline void jbd2_journal_abort_handle(handle_t *handle) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1286 | { |
| 1287 | handle->h_aborted = 1; |
| 1288 | } |
| 1289 | |
| 1290 | #endif /* __KERNEL__ */ |
| 1291 | |
| 1292 | /* Comparison functions for transaction IDs: perform comparisons using |
| 1293 | * modulo arithmetic so that they work over sequence number wraps. */ |
| 1294 | |
| 1295 | static inline int tid_gt(tid_t x, tid_t y) |
| 1296 | { |
| 1297 | int difference = (x - y); |
| 1298 | return (difference > 0); |
| 1299 | } |
| 1300 | |
| 1301 | static inline int tid_geq(tid_t x, tid_t y) |
| 1302 | { |
| 1303 | int difference = (x - y); |
| 1304 | return (difference >= 0); |
| 1305 | } |
| 1306 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1307 | extern int jbd2_journal_blocks_per_page(struct inode *inode); |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 1308 | extern size_t journal_tag_bytes(journal_t *journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1309 | |
Darrick J. Wong | db9ee22 | 2014-08-27 18:40:07 -0400 | [diff] [blame] | 1310 | static inline int jbd2_journal_has_csum_v2or3(journal_t *journal) |
| 1311 | { |
| 1312 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2) || |
| 1313 | JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V3)) |
| 1314 | return 1; |
| 1315 | |
| 1316 | return 0; |
| 1317 | } |
| 1318 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1319 | /* |
Jan Kara | 76c3990 | 2013-06-04 12:12:57 -0400 | [diff] [blame] | 1320 | * We reserve t_outstanding_credits >> JBD2_CONTROL_BLOCKS_SHIFT for |
| 1321 | * transaction control blocks. |
| 1322 | */ |
| 1323 | #define JBD2_CONTROL_BLOCKS_SHIFT 5 |
| 1324 | |
| 1325 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1326 | * Return the minimum number of blocks which must be free in the journal |
| 1327 | * before a new transaction may be started. Must be called under j_state_lock. |
| 1328 | */ |
Jan Kara | 76c3990 | 2013-06-04 12:12:57 -0400 | [diff] [blame] | 1329 | static inline int jbd2_space_needed(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1330 | { |
| 1331 | int nblocks = journal->j_max_transaction_buffers; |
Jan Kara | 76c3990 | 2013-06-04 12:12:57 -0400 | [diff] [blame] | 1332 | return nblocks + (nblocks >> JBD2_CONTROL_BLOCKS_SHIFT); |
| 1333 | } |
| 1334 | |
| 1335 | /* |
| 1336 | * Return number of free blocks in the log. Must be called under j_state_lock. |
| 1337 | */ |
| 1338 | static inline unsigned long jbd2_log_space_left(journal_t *journal) |
| 1339 | { |
| 1340 | /* Allow for rounding errors */ |
| 1341 | unsigned long free = journal->j_free - 32; |
| 1342 | |
| 1343 | if (journal->j_committing_transaction) { |
| 1344 | unsigned long committing = atomic_read(&journal-> |
| 1345 | j_committing_transaction->t_outstanding_credits); |
| 1346 | |
| 1347 | /* Transaction + control blocks */ |
| 1348 | free -= committing + (committing >> JBD2_CONTROL_BLOCKS_SHIFT); |
| 1349 | } |
| 1350 | return free; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1351 | } |
| 1352 | |
| 1353 | /* |
| 1354 | * Definitions which augment the buffer_head layer |
| 1355 | */ |
| 1356 | |
| 1357 | /* journaling buffer types */ |
| 1358 | #define BJ_None 0 /* Not journaled */ |
Jan Kara | 87c89c2 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1359 | #define BJ_Metadata 1 /* Normal journaled metadata */ |
| 1360 | #define BJ_Forget 2 /* Buffer superseded by this transaction */ |
Jan Kara | f5113ef | 2013-06-04 12:01:45 -0400 | [diff] [blame] | 1361 | #define BJ_Shadow 3 /* Buffer contents being shadowed to the log */ |
Jan Kara | e5a120a | 2013-06-04 12:06:01 -0400 | [diff] [blame] | 1362 | #define BJ_Reserved 4 /* Buffer is reserved for access by journal */ |
| 1363 | #define BJ_Types 5 |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1364 | |
| 1365 | extern int jbd_blocks_per_page(struct inode *inode); |
| 1366 | |
Behan Webster | fd47d3e | 2012-11-08 11:24:46 -0500 | [diff] [blame] | 1367 | /* JBD uses a CRC32 checksum */ |
| 1368 | #define JBD_MAX_CHECKSUM_SIZE 4 |
| 1369 | |
Darrick J. Wong | 01b5adc | 2012-05-27 07:50:56 -0400 | [diff] [blame] | 1370 | static inline u32 jbd2_chksum(journal_t *journal, u32 crc, |
| 1371 | const void *address, unsigned int length) |
| 1372 | { |
| 1373 | struct { |
| 1374 | struct shash_desc shash; |
Behan Webster | fd47d3e | 2012-11-08 11:24:46 -0500 | [diff] [blame] | 1375 | char ctx[JBD_MAX_CHECKSUM_SIZE]; |
Darrick J. Wong | 01b5adc | 2012-05-27 07:50:56 -0400 | [diff] [blame] | 1376 | } desc; |
| 1377 | int err; |
| 1378 | |
Behan Webster | fd47d3e | 2012-11-08 11:24:46 -0500 | [diff] [blame] | 1379 | BUG_ON(crypto_shash_descsize(journal->j_chksum_driver) > |
| 1380 | JBD_MAX_CHECKSUM_SIZE); |
| 1381 | |
Darrick J. Wong | 01b5adc | 2012-05-27 07:50:56 -0400 | [diff] [blame] | 1382 | desc.shash.tfm = journal->j_chksum_driver; |
| 1383 | desc.shash.flags = 0; |
| 1384 | *(u32 *)desc.ctx = crc; |
| 1385 | |
| 1386 | err = crypto_shash_update(&desc.shash, address, length); |
| 1387 | BUG_ON(err); |
| 1388 | |
| 1389 | return *(u32 *)desc.ctx; |
| 1390 | } |
| 1391 | |
Dmitry Monakhov | 06a407f | 2013-06-12 22:25:07 -0400 | [diff] [blame] | 1392 | /* Return most recent uncommitted transaction */ |
| 1393 | static inline tid_t jbd2_get_latest_transaction(journal_t *journal) |
| 1394 | { |
| 1395 | tid_t tid; |
| 1396 | |
| 1397 | read_lock(&journal->j_state_lock); |
| 1398 | tid = journal->j_commit_request; |
| 1399 | if (journal->j_running_transaction) |
| 1400 | tid = journal->j_running_transaction->t_tid; |
| 1401 | read_unlock(&journal->j_state_lock); |
| 1402 | return tid; |
| 1403 | } |
| 1404 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1405 | #ifdef __KERNEL__ |
| 1406 | |
| 1407 | #define buffer_trace_init(bh) do {} while (0) |
| 1408 | #define print_buffer_fields(bh) do {} while (0) |
| 1409 | #define print_buffer_trace(bh) do {} while (0) |
| 1410 | #define BUFFER_TRACE(bh, info) do {} while (0) |
| 1411 | #define BUFFER_TRACE2(bh, bh2, info) do {} while (0) |
| 1412 | #define JBUFFER_TRACE(jh, info) do {} while (0) |
| 1413 | |
| 1414 | #endif /* __KERNEL__ */ |
| 1415 | |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1416 | #endif /* _LINUX_JBD2_H */ |