13dcf5451SChristoph Hellwig /* 23dcf5451SChristoph Hellwig * ext4_jbd2.h 33dcf5451SChristoph Hellwig * 43dcf5451SChristoph Hellwig * Written by Stephen C. Tweedie <sct@redhat.com>, 1999 53dcf5451SChristoph Hellwig * 63dcf5451SChristoph Hellwig * Copyright 1998--1999 Red Hat corp --- All Rights Reserved 73dcf5451SChristoph Hellwig * 83dcf5451SChristoph Hellwig * This file is part of the Linux kernel and is made available under 93dcf5451SChristoph Hellwig * the terms of the GNU General Public License, version 2, or at your 103dcf5451SChristoph Hellwig * option, any later version, incorporated herein by reference. 113dcf5451SChristoph Hellwig * 123dcf5451SChristoph Hellwig * Ext4-specific journaling extensions. 133dcf5451SChristoph Hellwig */ 143dcf5451SChristoph Hellwig 153dcf5451SChristoph Hellwig #ifndef _EXT4_JBD2_H 163dcf5451SChristoph Hellwig #define _EXT4_JBD2_H 173dcf5451SChristoph Hellwig 183dcf5451SChristoph Hellwig #include <linux/fs.h> 193dcf5451SChristoph Hellwig #include <linux/jbd2.h> 203dcf5451SChristoph Hellwig #include "ext4.h" 213dcf5451SChristoph Hellwig 223dcf5451SChristoph Hellwig #define EXT4_JOURNAL(inode) (EXT4_SB((inode)->i_sb)->s_journal) 233dcf5451SChristoph Hellwig 243dcf5451SChristoph Hellwig /* Define the number of blocks we need to account to a transaction to 253dcf5451SChristoph Hellwig * modify one block of data. 263dcf5451SChristoph Hellwig * 273dcf5451SChristoph Hellwig * We may have to touch one inode, one bitmap buffer, up to three 283dcf5451SChristoph Hellwig * indirection blocks, the group and superblock summaries, and the data 293dcf5451SChristoph Hellwig * block to complete the transaction. 303dcf5451SChristoph Hellwig * 313dcf5451SChristoph Hellwig * For extents-enabled fs we may have to allocate and modify up to 323dcf5451SChristoph Hellwig * 5 levels of tree + root which are stored in the inode. */ 333dcf5451SChristoph Hellwig 343dcf5451SChristoph Hellwig #define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \ 353dcf5451SChristoph Hellwig (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \ 3683982b6fSTheodore Ts'o ? 27U : 8U) 373dcf5451SChristoph Hellwig 383dcf5451SChristoph Hellwig /* Extended attribute operations touch at most two data buffers, 393dcf5451SChristoph Hellwig * two bitmap buffers, and two group summaries, in addition to the inode 403dcf5451SChristoph Hellwig * and the superblock, which are already accounted for. */ 413dcf5451SChristoph Hellwig 423dcf5451SChristoph Hellwig #define EXT4_XATTR_TRANS_BLOCKS 6U 433dcf5451SChristoph Hellwig 443dcf5451SChristoph Hellwig /* Define the minimum size for a transaction which modifies data. This 453dcf5451SChristoph Hellwig * needs to take into account the fact that we may end up modifying two 463dcf5451SChristoph Hellwig * quota files too (one for the group, one for the user quota). The 473dcf5451SChristoph Hellwig * superblock only gets updated once, of course, so don't bother 483dcf5451SChristoph Hellwig * counting that again for the quota updates. */ 493dcf5451SChristoph Hellwig 503dcf5451SChristoph Hellwig #define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \ 513dcf5451SChristoph Hellwig EXT4_XATTR_TRANS_BLOCKS - 2 + \ 525aca07ebSDmitry Monakhov EXT4_MAXQUOTAS_TRANS_BLOCKS(sb)) 533dcf5451SChristoph Hellwig 54a02908f1SMingming Cao /* 55a02908f1SMingming Cao * Define the number of metadata blocks we need to account to modify data. 56a02908f1SMingming Cao * 57a02908f1SMingming Cao * This include super block, inode block, quota blocks and xattr blocks 58a02908f1SMingming Cao */ 59a02908f1SMingming Cao #define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \ 605aca07ebSDmitry Monakhov EXT4_MAXQUOTAS_TRANS_BLOCKS(sb)) 61a02908f1SMingming Cao 623dcf5451SChristoph Hellwig /* Delete operations potentially hit one directory's namespace plus an 633dcf5451SChristoph Hellwig * entire inode, plus arbitrary amounts of bitmap/indirection data. Be 643dcf5451SChristoph Hellwig * generous. We can grow the delete transaction later if necessary. */ 653dcf5451SChristoph Hellwig 663dcf5451SChristoph Hellwig #define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64) 673dcf5451SChristoph Hellwig 683dcf5451SChristoph Hellwig /* Define an arbitrary limit for the amount of data we will anticipate 693dcf5451SChristoph Hellwig * writing to any given transaction. For unbounded transactions such as 703dcf5451SChristoph Hellwig * write(2) and truncate(2) we can write more than this, but we always 713dcf5451SChristoph Hellwig * start off at the maximum transaction size and grow the transaction 723dcf5451SChristoph Hellwig * optimistically as we go. */ 733dcf5451SChristoph Hellwig 743dcf5451SChristoph Hellwig #define EXT4_MAX_TRANS_DATA 64U 753dcf5451SChristoph Hellwig 763dcf5451SChristoph Hellwig /* We break up a large truncate or write transaction once the handle's 773dcf5451SChristoph Hellwig * buffer credits gets this low, we need either to extend the 783dcf5451SChristoph Hellwig * transaction or to start a new one. Reserve enough space here for 793dcf5451SChristoph Hellwig * inode, bitmap, superblock, group and indirection updates for at least 803dcf5451SChristoph Hellwig * one block, plus two quota updates. Quota allocations are not 813dcf5451SChristoph Hellwig * needed. */ 823dcf5451SChristoph Hellwig 833dcf5451SChristoph Hellwig #define EXT4_RESERVE_TRANS_BLOCKS 12U 843dcf5451SChristoph Hellwig 853dcf5451SChristoph Hellwig #define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8 863dcf5451SChristoph Hellwig 873dcf5451SChristoph Hellwig #ifdef CONFIG_QUOTA 883dcf5451SChristoph Hellwig /* Amount of blocks needed for quota update - we know that the structure was 893dcf5451SChristoph Hellwig * allocated so we need to update only inode+data */ 903dcf5451SChristoph Hellwig #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0) 913dcf5451SChristoph Hellwig /* Amount of blocks needed for quota insert/delete - we do some block writes 923dcf5451SChristoph Hellwig * but inode, sb and group updates are done only once */ 933dcf5451SChristoph Hellwig #define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\ 943dcf5451SChristoph Hellwig (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0) 955aca07ebSDmitry Monakhov 963dcf5451SChristoph Hellwig #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ 973dcf5451SChristoph Hellwig (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0) 983dcf5451SChristoph Hellwig #else 993dcf5451SChristoph Hellwig #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0 1003dcf5451SChristoph Hellwig #define EXT4_QUOTA_INIT_BLOCKS(sb) 0 1013dcf5451SChristoph Hellwig #define EXT4_QUOTA_DEL_BLOCKS(sb) 0 1023dcf5451SChristoph Hellwig #endif 1035aca07ebSDmitry Monakhov #define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb)) 1045aca07ebSDmitry Monakhov #define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb)) 1055aca07ebSDmitry Monakhov #define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb)) 1063dcf5451SChristoph Hellwig 1073dcf5451SChristoph Hellwig int 1083dcf5451SChristoph Hellwig ext4_mark_iloc_dirty(handle_t *handle, 1093dcf5451SChristoph Hellwig struct inode *inode, 1103dcf5451SChristoph Hellwig struct ext4_iloc *iloc); 1113dcf5451SChristoph Hellwig 1123dcf5451SChristoph Hellwig /* 1133dcf5451SChristoph Hellwig * On success, We end up with an outstanding reference count against 1143dcf5451SChristoph Hellwig * iloc->bh. This _must_ be cleaned up later. 1153dcf5451SChristoph Hellwig */ 1163dcf5451SChristoph Hellwig 1173dcf5451SChristoph Hellwig int ext4_reserve_inode_write(handle_t *handle, struct inode *inode, 1183dcf5451SChristoph Hellwig struct ext4_iloc *iloc); 1193dcf5451SChristoph Hellwig 1203dcf5451SChristoph Hellwig int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode); 1213dcf5451SChristoph Hellwig 1223dcf5451SChristoph Hellwig /* 123e4684b3fSTheodore Ts'o * Wrapper functions with which ext4 calls into JBD. 1243dcf5451SChristoph Hellwig */ 12590c7201bSTheodore Ts'o void ext4_journal_abort_handle(const char *caller, unsigned int line, 12690c7201bSTheodore Ts'o const char *err_fn, 1273dcf5451SChristoph Hellwig struct buffer_head *bh, handle_t *handle, int err); 1283dcf5451SChristoph Hellwig 12990c7201bSTheodore Ts'o int __ext4_journal_get_undo_access(const char *where, unsigned int line, 1303dcf5451SChristoph Hellwig handle_t *handle, struct buffer_head *bh); 1313dcf5451SChristoph Hellwig 13290c7201bSTheodore Ts'o int __ext4_journal_get_write_access(const char *where, unsigned int line, 13390c7201bSTheodore Ts'o handle_t *handle, struct buffer_head *bh); 1343dcf5451SChristoph Hellwig 13590c7201bSTheodore Ts'o int __ext4_forget(const char *where, unsigned int line, handle_t *handle, 13690c7201bSTheodore Ts'o int is_metadata, struct inode *inode, 13790c7201bSTheodore Ts'o struct buffer_head *bh, ext4_fsblk_t blocknr); 13890c7201bSTheodore Ts'o 13990c7201bSTheodore Ts'o int __ext4_journal_get_create_access(const char *where, unsigned int line, 14090c7201bSTheodore Ts'o handle_t *handle, struct buffer_head *bh); 14190c7201bSTheodore Ts'o 14290c7201bSTheodore Ts'o int __ext4_handle_dirty_metadata(const char *where, unsigned int line, 14390c7201bSTheodore Ts'o handle_t *handle, struct inode *inode, 14490c7201bSTheodore Ts'o struct buffer_head *bh); 14590c7201bSTheodore Ts'o 14690c7201bSTheodore Ts'o int __ext4_handle_dirty_super(const char *where, unsigned int line, 14790c7201bSTheodore Ts'o handle_t *handle, struct super_block *sb); 148a0375156STheodore Ts'o 1493dcf5451SChristoph Hellwig #define ext4_journal_get_undo_access(handle, bh) \ 15090c7201bSTheodore Ts'o __ext4_journal_get_undo_access(__func__, __LINE__, (handle), (bh)) 1513dcf5451SChristoph Hellwig #define ext4_journal_get_write_access(handle, bh) \ 15290c7201bSTheodore Ts'o __ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh)) 153d6797d14STheodore Ts'o #define ext4_forget(handle, is_metadata, inode, bh, block_nr) \ 15490c7201bSTheodore Ts'o __ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \ 15590c7201bSTheodore Ts'o (bh), (block_nr)) 1563dcf5451SChristoph Hellwig #define ext4_journal_get_create_access(handle, bh) \ 15790c7201bSTheodore Ts'o __ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh)) 1580390131bSFrank Mayhar #define ext4_handle_dirty_metadata(handle, inode, bh) \ 15990c7201bSTheodore Ts'o __ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \ 16090c7201bSTheodore Ts'o (bh)) 161a0375156STheodore Ts'o #define ext4_handle_dirty_super(handle, sb) \ 16290c7201bSTheodore Ts'o __ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb)) 1633dcf5451SChristoph Hellwig 1643dcf5451SChristoph Hellwig handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks); 165c398eda0STheodore Ts'o int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle); 1663dcf5451SChristoph Hellwig 167d3d1faf6SCurt Wohlgemuth #define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096) 1680390131bSFrank Mayhar 169d3d1faf6SCurt Wohlgemuth /* Note: Do not use this for NULL handles. This is only to determine if 170d3d1faf6SCurt Wohlgemuth * a properly allocated handle is using a journal or not. */ 1710390131bSFrank Mayhar static inline int ext4_handle_valid(handle_t *handle) 1720390131bSFrank Mayhar { 173d3d1faf6SCurt Wohlgemuth if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT) 1740390131bSFrank Mayhar return 0; 1750390131bSFrank Mayhar return 1; 1760390131bSFrank Mayhar } 1770390131bSFrank Mayhar 1780390131bSFrank Mayhar static inline void ext4_handle_sync(handle_t *handle) 1790390131bSFrank Mayhar { 1800390131bSFrank Mayhar if (ext4_handle_valid(handle)) 1810390131bSFrank Mayhar handle->h_sync = 1; 1820390131bSFrank Mayhar } 1830390131bSFrank Mayhar 1840390131bSFrank Mayhar static inline void ext4_handle_release_buffer(handle_t *handle, 1850390131bSFrank Mayhar struct buffer_head *bh) 1860390131bSFrank Mayhar { 1870390131bSFrank Mayhar if (ext4_handle_valid(handle)) 1880390131bSFrank Mayhar jbd2_journal_release_buffer(handle, bh); 1890390131bSFrank Mayhar } 1900390131bSFrank Mayhar 1910390131bSFrank Mayhar static inline int ext4_handle_is_aborted(handle_t *handle) 1920390131bSFrank Mayhar { 1930390131bSFrank Mayhar if (ext4_handle_valid(handle)) 1940390131bSFrank Mayhar return is_handle_aborted(handle); 1950390131bSFrank Mayhar return 0; 1960390131bSFrank Mayhar } 1970390131bSFrank Mayhar 1980390131bSFrank Mayhar static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed) 1990390131bSFrank Mayhar { 2000390131bSFrank Mayhar if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed) 2010390131bSFrank Mayhar return 0; 2020390131bSFrank Mayhar return 1; 2030390131bSFrank Mayhar } 2040390131bSFrank Mayhar 2050390131bSFrank Mayhar static inline void ext4_journal_release_buffer(handle_t *handle, 2060390131bSFrank Mayhar struct buffer_head *bh) 2070390131bSFrank Mayhar { 2080390131bSFrank Mayhar if (ext4_handle_valid(handle)) 2090390131bSFrank Mayhar jbd2_journal_release_buffer(handle, bh); 2100390131bSFrank Mayhar } 2110390131bSFrank Mayhar 2123dcf5451SChristoph Hellwig static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks) 2133dcf5451SChristoph Hellwig { 2143dcf5451SChristoph Hellwig return ext4_journal_start_sb(inode->i_sb, nblocks); 2153dcf5451SChristoph Hellwig } 2163dcf5451SChristoph Hellwig 2173dcf5451SChristoph Hellwig #define ext4_journal_stop(handle) \ 218c398eda0STheodore Ts'o __ext4_journal_stop(__func__, __LINE__, (handle)) 2193dcf5451SChristoph Hellwig 2203dcf5451SChristoph Hellwig static inline handle_t *ext4_journal_current_handle(void) 2213dcf5451SChristoph Hellwig { 2223dcf5451SChristoph Hellwig return journal_current_handle(); 2233dcf5451SChristoph Hellwig } 2243dcf5451SChristoph Hellwig 2253dcf5451SChristoph Hellwig static inline int ext4_journal_extend(handle_t *handle, int nblocks) 2263dcf5451SChristoph Hellwig { 2270390131bSFrank Mayhar if (ext4_handle_valid(handle)) 2283dcf5451SChristoph Hellwig return jbd2_journal_extend(handle, nblocks); 2290390131bSFrank Mayhar return 0; 2303dcf5451SChristoph Hellwig } 2313dcf5451SChristoph Hellwig 2323dcf5451SChristoph Hellwig static inline int ext4_journal_restart(handle_t *handle, int nblocks) 2333dcf5451SChristoph Hellwig { 2340390131bSFrank Mayhar if (ext4_handle_valid(handle)) 2353dcf5451SChristoph Hellwig return jbd2_journal_restart(handle, nblocks); 2360390131bSFrank Mayhar return 0; 2373dcf5451SChristoph Hellwig } 2383dcf5451SChristoph Hellwig 2393dcf5451SChristoph Hellwig static inline int ext4_journal_blocks_per_page(struct inode *inode) 2403dcf5451SChristoph Hellwig { 2410390131bSFrank Mayhar if (EXT4_JOURNAL(inode) != NULL) 2423dcf5451SChristoph Hellwig return jbd2_journal_blocks_per_page(inode); 2430390131bSFrank Mayhar return 0; 2443dcf5451SChristoph Hellwig } 2453dcf5451SChristoph Hellwig 2463dcf5451SChristoph Hellwig static inline int ext4_journal_force_commit(journal_t *journal) 2473dcf5451SChristoph Hellwig { 2480390131bSFrank Mayhar if (journal) 2493dcf5451SChristoph Hellwig return jbd2_journal_force_commit(journal); 2500390131bSFrank Mayhar return 0; 2513dcf5451SChristoph Hellwig } 2523dcf5451SChristoph Hellwig 253678aaf48SJan Kara static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) 254678aaf48SJan Kara { 2550390131bSFrank Mayhar if (ext4_handle_valid(handle)) 256678aaf48SJan Kara return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode); 2570390131bSFrank Mayhar return 0; 258678aaf48SJan Kara } 259678aaf48SJan Kara 260b436b9beSJan Kara static inline void ext4_update_inode_fsync_trans(handle_t *handle, 261b436b9beSJan Kara struct inode *inode, 262b436b9beSJan Kara int datasync) 263b436b9beSJan Kara { 264b436b9beSJan Kara struct ext4_inode_info *ei = EXT4_I(inode); 265b436b9beSJan Kara 266b436b9beSJan Kara if (ext4_handle_valid(handle)) { 267b436b9beSJan Kara ei->i_sync_tid = handle->h_transaction->t_tid; 268b436b9beSJan Kara if (datasync) 269b436b9beSJan Kara ei->i_datasync_tid = handle->h_transaction->t_tid; 270b436b9beSJan Kara } 271b436b9beSJan Kara } 272b436b9beSJan Kara 2733dcf5451SChristoph Hellwig /* super.c */ 2743dcf5451SChristoph Hellwig int ext4_force_commit(struct super_block *sb); 2753dcf5451SChristoph Hellwig 2763dcf5451SChristoph Hellwig static inline int ext4_should_journal_data(struct inode *inode) 2773dcf5451SChristoph Hellwig { 2780390131bSFrank Mayhar if (EXT4_JOURNAL(inode) == NULL) 2790390131bSFrank Mayhar return 0; 2803dcf5451SChristoph Hellwig if (!S_ISREG(inode->i_mode)) 2813dcf5451SChristoph Hellwig return 1; 2823dcf5451SChristoph Hellwig if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 2833dcf5451SChristoph Hellwig return 1; 28412e9b892SDmitry Monakhov if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA)) 2853dcf5451SChristoph Hellwig return 1; 2863dcf5451SChristoph Hellwig return 0; 2873dcf5451SChristoph Hellwig } 2883dcf5451SChristoph Hellwig 2893dcf5451SChristoph Hellwig static inline int ext4_should_order_data(struct inode *inode) 2903dcf5451SChristoph Hellwig { 2910390131bSFrank Mayhar if (EXT4_JOURNAL(inode) == NULL) 2920390131bSFrank Mayhar return 0; 2933dcf5451SChristoph Hellwig if (!S_ISREG(inode->i_mode)) 2943dcf5451SChristoph Hellwig return 0; 29512e9b892SDmitry Monakhov if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA)) 2963dcf5451SChristoph Hellwig return 0; 2973dcf5451SChristoph Hellwig if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 2983dcf5451SChristoph Hellwig return 1; 2993dcf5451SChristoph Hellwig return 0; 3003dcf5451SChristoph Hellwig } 3013dcf5451SChristoph Hellwig 3023dcf5451SChristoph Hellwig static inline int ext4_should_writeback_data(struct inode *inode) 3033dcf5451SChristoph Hellwig { 3043dcf5451SChristoph Hellwig if (!S_ISREG(inode->i_mode)) 3053dcf5451SChristoph Hellwig return 0; 3065adfee9cSTheodore Ts'o if (EXT4_JOURNAL(inode) == NULL) 3075adfee9cSTheodore Ts'o return 1; 30812e9b892SDmitry Monakhov if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA)) 3093dcf5451SChristoph Hellwig return 0; 3103dcf5451SChristoph Hellwig if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 3113dcf5451SChristoph Hellwig return 1; 3123dcf5451SChristoph Hellwig return 0; 3133dcf5451SChristoph Hellwig } 3143dcf5451SChristoph Hellwig 315744692dcSJiaying Zhang /* 316744692dcSJiaying Zhang * This function controls whether or not we should try to go down the 317744692dcSJiaying Zhang * dioread_nolock code paths, which makes it safe to avoid taking 318744692dcSJiaying Zhang * i_mutex for direct I/O reads. This only works for extent-based 319206f7ab4SChristoph Hellwig * files, and it doesn't work if data journaling is enabled, since the 320206f7ab4SChristoph Hellwig * dioread_nolock code uses b_private to pass information back to the 321206f7ab4SChristoph Hellwig * I/O completion handler, and this conflicts with the jbd's use of 322206f7ab4SChristoph Hellwig * b_private. 323744692dcSJiaying Zhang */ 324744692dcSJiaying Zhang static inline int ext4_should_dioread_nolock(struct inode *inode) 325744692dcSJiaying Zhang { 326744692dcSJiaying Zhang if (!test_opt(inode->i_sb, DIOREAD_NOLOCK)) 327744692dcSJiaying Zhang return 0; 328744692dcSJiaying Zhang if (!S_ISREG(inode->i_mode)) 329744692dcSJiaying Zhang return 0; 33012e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 331744692dcSJiaying Zhang return 0; 332744692dcSJiaying Zhang if (ext4_should_journal_data(inode)) 333744692dcSJiaying Zhang return 0; 334744692dcSJiaying Zhang return 1; 335744692dcSJiaying Zhang } 336744692dcSJiaying Zhang 3373dcf5451SChristoph Hellwig #endif /* _EXT4_JBD2_H */ 338