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 /* Delete operations potentially hit one directory's namespace plus an 55 * entire inode, plus arbitrary amounts of bitmap/indirection data. Be 56 * generous. We can grow the delete transaction later if necessary. */ 57 58 #define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64) 59 60 /* Define an arbitrary limit for the amount of data we will anticipate 61 * writing to any given transaction. For unbounded transactions such as 62 * write(2) and truncate(2) we can write more than this, but we always 63 * start off at the maximum transaction size and grow the transaction 64 * optimistically as we go. */ 65 66 #define EXT4_MAX_TRANS_DATA 64U 67 68 /* We break up a large truncate or write transaction once the handle's 69 * buffer credits gets this low, we need either to extend the 70 * transaction or to start a new one. Reserve enough space here for 71 * inode, bitmap, superblock, group and indirection updates for at least 72 * one block, plus two quota updates. Quota allocations are not 73 * needed. */ 74 75 #define EXT4_RESERVE_TRANS_BLOCKS 12U 76 77 #define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8 78 79 #ifdef CONFIG_QUOTA 80 /* Amount of blocks needed for quota update - we know that the structure was 81 * allocated so we need to update only inode+data */ 82 #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0) 83 /* Amount of blocks needed for quota insert/delete - we do some block writes 84 * but inode, sb and group updates are done only once */ 85 #define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\ 86 (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0) 87 #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ 88 (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0) 89 #else 90 #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0 91 #define EXT4_QUOTA_INIT_BLOCKS(sb) 0 92 #define EXT4_QUOTA_DEL_BLOCKS(sb) 0 93 #endif 94 95 int 96 ext4_mark_iloc_dirty(handle_t *handle, 97 struct inode *inode, 98 struct ext4_iloc *iloc); 99 100 /* 101 * On success, We end up with an outstanding reference count against 102 * iloc->bh. This _must_ be cleaned up later. 103 */ 104 105 int ext4_reserve_inode_write(handle_t *handle, struct inode *inode, 106 struct ext4_iloc *iloc); 107 108 int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode); 109 110 /* 111 * Wrapper functions with which ext4 calls into JBD. The intent here is 112 * to allow these to be turned into appropriate stubs so ext4 can control 113 * ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't 114 * been done yet. 115 */ 116 117 static inline void ext4_journal_release_buffer(handle_t *handle, 118 struct buffer_head *bh) 119 { 120 jbd2_journal_release_buffer(handle, bh); 121 } 122 123 void ext4_journal_abort_handle(const char *caller, const char *err_fn, 124 struct buffer_head *bh, handle_t *handle, int err); 125 126 int __ext4_journal_get_undo_access(const char *where, handle_t *handle, 127 struct buffer_head *bh); 128 129 int __ext4_journal_get_write_access(const char *where, handle_t *handle, 130 struct buffer_head *bh); 131 132 int __ext4_journal_forget(const char *where, handle_t *handle, 133 struct buffer_head *bh); 134 135 int __ext4_journal_revoke(const char *where, handle_t *handle, 136 ext4_fsblk_t blocknr, struct buffer_head *bh); 137 138 int __ext4_journal_get_create_access(const char *where, 139 handle_t *handle, struct buffer_head *bh); 140 141 int __ext4_journal_dirty_metadata(const char *where, 142 handle_t *handle, struct buffer_head *bh); 143 144 #define ext4_journal_get_undo_access(handle, bh) \ 145 __ext4_journal_get_undo_access(__func__, (handle), (bh)) 146 #define ext4_journal_get_write_access(handle, bh) \ 147 __ext4_journal_get_write_access(__func__, (handle), (bh)) 148 #define ext4_journal_revoke(handle, blocknr, bh) \ 149 __ext4_journal_revoke(__func__, (handle), (blocknr), (bh)) 150 #define ext4_journal_get_create_access(handle, bh) \ 151 __ext4_journal_get_create_access(__func__, (handle), (bh)) 152 #define ext4_journal_dirty_metadata(handle, bh) \ 153 __ext4_journal_dirty_metadata(__func__, (handle), (bh)) 154 #define ext4_journal_forget(handle, bh) \ 155 __ext4_journal_forget(__func__, (handle), (bh)) 156 157 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks); 158 int __ext4_journal_stop(const char *where, handle_t *handle); 159 160 static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks) 161 { 162 return ext4_journal_start_sb(inode->i_sb, nblocks); 163 } 164 165 #define ext4_journal_stop(handle) \ 166 __ext4_journal_stop(__func__, (handle)) 167 168 static inline handle_t *ext4_journal_current_handle(void) 169 { 170 return journal_current_handle(); 171 } 172 173 static inline int ext4_journal_extend(handle_t *handle, int nblocks) 174 { 175 return jbd2_journal_extend(handle, nblocks); 176 } 177 178 static inline int ext4_journal_restart(handle_t *handle, int nblocks) 179 { 180 return jbd2_journal_restart(handle, nblocks); 181 } 182 183 static inline int ext4_journal_blocks_per_page(struct inode *inode) 184 { 185 return jbd2_journal_blocks_per_page(inode); 186 } 187 188 static inline int ext4_journal_force_commit(journal_t *journal) 189 { 190 return jbd2_journal_force_commit(journal); 191 } 192 193 static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) 194 { 195 return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode); 196 } 197 198 /* super.c */ 199 int ext4_force_commit(struct super_block *sb); 200 201 static inline int ext4_should_journal_data(struct inode *inode) 202 { 203 if (!S_ISREG(inode->i_mode)) 204 return 1; 205 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 206 return 1; 207 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) 208 return 1; 209 return 0; 210 } 211 212 static inline int ext4_should_order_data(struct inode *inode) 213 { 214 if (!S_ISREG(inode->i_mode)) 215 return 0; 216 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) 217 return 0; 218 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 219 return 1; 220 return 0; 221 } 222 223 static inline int ext4_should_writeback_data(struct inode *inode) 224 { 225 if (!S_ISREG(inode->i_mode)) 226 return 0; 227 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) 228 return 0; 229 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 230 return 1; 231 return 0; 232 } 233 234 #endif /* _EXT4_JBD2_H */ 235