1 /* 2 * ext4_jbd2.h 3 * 4 * Written by Stephen C. Tweedie <sct@redhat.com>, 1999 5 * 6 * Copyright 1998--1999 Red Hat corp --- 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 * Ext4-specific journaling extensions. 13 */ 14 15 #ifndef _EXT4_JBD2_H 16 #define _EXT4_JBD2_H 17 18 #include <linux/fs.h> 19 #include <linux/jbd2.h> 20 #include "ext4.h" 21 22 #define EXT4_JOURNAL(inode) (EXT4_SB((inode)->i_sb)->s_journal) 23 24 /* Define the number of blocks we need to account to a transaction to 25 * modify one block of data. 26 * 27 * We may have to touch one inode, one bitmap buffer, up to three 28 * indirection blocks, the group and superblock summaries, and the data 29 * block to complete the transaction. 30 * 31 * For extents-enabled fs we may have to allocate and modify up to 32 * 5 levels of tree + root which are stored in the inode. */ 33 34 #define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \ 35 (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \ 36 || test_opt(sb, EXTENTS) ? 27U : 8U) 37 38 /* Extended attribute operations touch at most two data buffers, 39 * two bitmap buffers, and two group summaries, in addition to the inode 40 * and the superblock, which are already accounted for. */ 41 42 #define EXT4_XATTR_TRANS_BLOCKS 6U 43 44 /* Define the minimum size for a transaction which modifies data. This 45 * needs to take into account the fact that we may end up modifying two 46 * quota files too (one for the group, one for the user quota). The 47 * superblock only gets updated once, of course, so don't bother 48 * counting that again for the quota updates. */ 49 50 #define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \ 51 EXT4_XATTR_TRANS_BLOCKS - 2 + \ 52 2*EXT4_QUOTA_TRANS_BLOCKS(sb)) 53 54 /* 55 * Define the number of metadata blocks we need to account to modify data. 56 * 57 * This include super block, inode block, quota blocks and xattr blocks 58 */ 59 #define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \ 60 2*EXT4_QUOTA_TRANS_BLOCKS(sb)) 61 62 /* Delete operations potentially hit one directory's namespace plus an 63 * entire inode, plus arbitrary amounts of bitmap/indirection data. Be 64 * generous. We can grow the delete transaction later if necessary. */ 65 66 #define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64) 67 68 /* Define an arbitrary limit for the amount of data we will anticipate 69 * writing to any given transaction. For unbounded transactions such as 70 * write(2) and truncate(2) we can write more than this, but we always 71 * start off at the maximum transaction size and grow the transaction 72 * optimistically as we go. */ 73 74 #define EXT4_MAX_TRANS_DATA 64U 75 76 /* We break up a large truncate or write transaction once the handle's 77 * buffer credits gets this low, we need either to extend the 78 * transaction or to start a new one. Reserve enough space here for 79 * inode, bitmap, superblock, group and indirection updates for at least 80 * one block, plus two quota updates. Quota allocations are not 81 * needed. */ 82 83 #define EXT4_RESERVE_TRANS_BLOCKS 12U 84 85 #define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8 86 87 #ifdef CONFIG_QUOTA 88 /* Amount of blocks needed for quota update - we know that the structure was 89 * allocated so we need to update only inode+data */ 90 #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0) 91 /* Amount of blocks needed for quota insert/delete - we do some block writes 92 * but inode, sb and group updates are done only once */ 93 #define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\ 94 (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0) 95 #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ 96 (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0) 97 #else 98 #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0 99 #define EXT4_QUOTA_INIT_BLOCKS(sb) 0 100 #define EXT4_QUOTA_DEL_BLOCKS(sb) 0 101 #endif 102 103 int 104 ext4_mark_iloc_dirty(handle_t *handle, 105 struct inode *inode, 106 struct ext4_iloc *iloc); 107 108 /* 109 * On success, We end up with an outstanding reference count against 110 * iloc->bh. This _must_ be cleaned up later. 111 */ 112 113 int ext4_reserve_inode_write(handle_t *handle, struct inode *inode, 114 struct ext4_iloc *iloc); 115 116 int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode); 117 118 /* 119 * Wrapper functions with which ext4 calls into JBD. The intent here is 120 * to allow these to be turned into appropriate stubs so ext4 can control 121 * ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't 122 * been done yet. 123 */ 124 125 static inline void ext4_journal_release_buffer(handle_t *handle, 126 struct buffer_head *bh) 127 { 128 jbd2_journal_release_buffer(handle, bh); 129 } 130 131 void ext4_journal_abort_handle(const char *caller, const char *err_fn, 132 struct buffer_head *bh, handle_t *handle, int err); 133 134 int __ext4_journal_get_undo_access(const char *where, handle_t *handle, 135 struct buffer_head *bh); 136 137 int __ext4_journal_get_write_access(const char *where, handle_t *handle, 138 struct buffer_head *bh); 139 140 int __ext4_journal_forget(const char *where, handle_t *handle, 141 struct buffer_head *bh); 142 143 int __ext4_journal_revoke(const char *where, handle_t *handle, 144 ext4_fsblk_t blocknr, struct buffer_head *bh); 145 146 int __ext4_journal_get_create_access(const char *where, 147 handle_t *handle, struct buffer_head *bh); 148 149 int __ext4_journal_dirty_metadata(const char *where, 150 handle_t *handle, struct buffer_head *bh); 151 152 #define ext4_journal_get_undo_access(handle, bh) \ 153 __ext4_journal_get_undo_access(__func__, (handle), (bh)) 154 #define ext4_journal_get_write_access(handle, bh) \ 155 __ext4_journal_get_write_access(__func__, (handle), (bh)) 156 #define ext4_journal_revoke(handle, blocknr, bh) \ 157 __ext4_journal_revoke(__func__, (handle), (blocknr), (bh)) 158 #define ext4_journal_get_create_access(handle, bh) \ 159 __ext4_journal_get_create_access(__func__, (handle), (bh)) 160 #define ext4_journal_dirty_metadata(handle, bh) \ 161 __ext4_journal_dirty_metadata(__func__, (handle), (bh)) 162 #define ext4_journal_forget(handle, bh) \ 163 __ext4_journal_forget(__func__, (handle), (bh)) 164 165 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks); 166 int __ext4_journal_stop(const char *where, handle_t *handle); 167 168 static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks) 169 { 170 return ext4_journal_start_sb(inode->i_sb, nblocks); 171 } 172 173 #define ext4_journal_stop(handle) \ 174 __ext4_journal_stop(__func__, (handle)) 175 176 static inline handle_t *ext4_journal_current_handle(void) 177 { 178 return journal_current_handle(); 179 } 180 181 static inline int ext4_journal_extend(handle_t *handle, int nblocks) 182 { 183 return jbd2_journal_extend(handle, nblocks); 184 } 185 186 static inline int ext4_journal_restart(handle_t *handle, int nblocks) 187 { 188 return jbd2_journal_restart(handle, nblocks); 189 } 190 191 static inline int ext4_journal_blocks_per_page(struct inode *inode) 192 { 193 return jbd2_journal_blocks_per_page(inode); 194 } 195 196 static inline int ext4_journal_force_commit(journal_t *journal) 197 { 198 return jbd2_journal_force_commit(journal); 199 } 200 201 static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) 202 { 203 return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode); 204 } 205 206 /* super.c */ 207 int ext4_force_commit(struct super_block *sb); 208 209 static inline int ext4_should_journal_data(struct inode *inode) 210 { 211 if (!S_ISREG(inode->i_mode)) 212 return 1; 213 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 214 return 1; 215 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) 216 return 1; 217 return 0; 218 } 219 220 static inline int ext4_should_order_data(struct inode *inode) 221 { 222 if (!S_ISREG(inode->i_mode)) 223 return 0; 224 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) 225 return 0; 226 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 227 return 1; 228 return 0; 229 } 230 231 static inline int ext4_should_writeback_data(struct inode *inode) 232 { 233 if (!S_ISREG(inode->i_mode)) 234 return 0; 235 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) 236 return 0; 237 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 238 return 1; 239 return 0; 240 } 241 242 #endif /* _EXT4_JBD2_H */ 243