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 8921f97697SJan Kara * allocated so we need to update only data block */ 9021f97697SJan Kara #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 1 : 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 10718aadd47SBobi Jam /** 10818aadd47SBobi Jam * struct ext4_journal_cb_entry - Base structure for callback information. 10918aadd47SBobi Jam * 11018aadd47SBobi Jam * This struct is a 'seed' structure for a using with your own callback 11118aadd47SBobi Jam * structs. If you are using callbacks you must allocate one of these 11218aadd47SBobi Jam * or another struct of your own definition which has this struct 11318aadd47SBobi Jam * as it's first element and pass it to ext4_journal_callback_add(). 11418aadd47SBobi Jam */ 11518aadd47SBobi Jam struct ext4_journal_cb_entry { 11618aadd47SBobi Jam /* list information for other callbacks attached to the same handle */ 11718aadd47SBobi Jam struct list_head jce_list; 11818aadd47SBobi Jam 11918aadd47SBobi Jam /* Function to call with this callback structure */ 12018aadd47SBobi Jam void (*jce_func)(struct super_block *sb, 12118aadd47SBobi Jam struct ext4_journal_cb_entry *jce, int error); 12218aadd47SBobi Jam 12318aadd47SBobi Jam /* user data goes here */ 12418aadd47SBobi Jam }; 12518aadd47SBobi Jam 12618aadd47SBobi Jam /** 12718aadd47SBobi Jam * ext4_journal_callback_add: add a function to call after transaction commit 12818aadd47SBobi Jam * @handle: active journal transaction handle to register callback on 12918aadd47SBobi Jam * @func: callback function to call after the transaction has committed: 13018aadd47SBobi Jam * @sb: superblock of current filesystem for transaction 13118aadd47SBobi Jam * @jce: returned journal callback data 13218aadd47SBobi Jam * @rc: journal state at commit (0 = transaction committed properly) 13318aadd47SBobi Jam * @jce: journal callback data (internal and function private data struct) 13418aadd47SBobi Jam * 13518aadd47SBobi Jam * The registered function will be called in the context of the journal thread 13618aadd47SBobi Jam * after the transaction for which the handle was created has completed. 13718aadd47SBobi Jam * 13818aadd47SBobi Jam * No locks are held when the callback function is called, so it is safe to 13918aadd47SBobi Jam * call blocking functions from within the callback, but the callback should 14018aadd47SBobi Jam * not block or run for too long, or the filesystem will be blocked waiting for 14118aadd47SBobi Jam * the next transaction to commit. No journaling functions can be used, or 14218aadd47SBobi Jam * there is a risk of deadlock. 14318aadd47SBobi Jam * 14418aadd47SBobi Jam * There is no guaranteed calling order of multiple registered callbacks on 14518aadd47SBobi Jam * the same transaction. 14618aadd47SBobi Jam */ 14718aadd47SBobi Jam static inline void ext4_journal_callback_add(handle_t *handle, 14818aadd47SBobi Jam void (*func)(struct super_block *sb, 14918aadd47SBobi Jam struct ext4_journal_cb_entry *jce, 15018aadd47SBobi Jam int rc), 15118aadd47SBobi Jam struct ext4_journal_cb_entry *jce) 15218aadd47SBobi Jam { 15318aadd47SBobi Jam struct ext4_sb_info *sbi = 15418aadd47SBobi Jam EXT4_SB(handle->h_transaction->t_journal->j_private); 15518aadd47SBobi Jam 15618aadd47SBobi Jam /* Add the jce to transaction's private list */ 15718aadd47SBobi Jam jce->jce_func = func; 15818aadd47SBobi Jam spin_lock(&sbi->s_md_lock); 15918aadd47SBobi Jam list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list); 16018aadd47SBobi Jam spin_unlock(&sbi->s_md_lock); 16118aadd47SBobi Jam } 16218aadd47SBobi Jam 16318aadd47SBobi Jam /** 16418aadd47SBobi Jam * ext4_journal_callback_del: delete a registered callback 16518aadd47SBobi Jam * @handle: active journal transaction handle on which callback was registered 16618aadd47SBobi Jam * @jce: registered journal callback entry to unregister 16718aadd47SBobi Jam */ 16818aadd47SBobi Jam static inline void ext4_journal_callback_del(handle_t *handle, 16918aadd47SBobi Jam struct ext4_journal_cb_entry *jce) 17018aadd47SBobi Jam { 17118aadd47SBobi Jam struct ext4_sb_info *sbi = 17218aadd47SBobi Jam EXT4_SB(handle->h_transaction->t_journal->j_private); 17318aadd47SBobi Jam 17418aadd47SBobi Jam spin_lock(&sbi->s_md_lock); 17518aadd47SBobi Jam list_del_init(&jce->jce_list); 17618aadd47SBobi Jam spin_unlock(&sbi->s_md_lock); 17718aadd47SBobi Jam } 17818aadd47SBobi Jam 1793dcf5451SChristoph Hellwig int 1803dcf5451SChristoph Hellwig ext4_mark_iloc_dirty(handle_t *handle, 1813dcf5451SChristoph Hellwig struct inode *inode, 1823dcf5451SChristoph Hellwig struct ext4_iloc *iloc); 1833dcf5451SChristoph Hellwig 1843dcf5451SChristoph Hellwig /* 1853dcf5451SChristoph Hellwig * On success, We end up with an outstanding reference count against 1863dcf5451SChristoph Hellwig * iloc->bh. This _must_ be cleaned up later. 1873dcf5451SChristoph Hellwig */ 1883dcf5451SChristoph Hellwig 1893dcf5451SChristoph Hellwig int ext4_reserve_inode_write(handle_t *handle, struct inode *inode, 1903dcf5451SChristoph Hellwig struct ext4_iloc *iloc); 1913dcf5451SChristoph Hellwig 1923dcf5451SChristoph Hellwig int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode); 1933dcf5451SChristoph Hellwig 1943dcf5451SChristoph Hellwig /* 195e4684b3fSTheodore Ts'o * Wrapper functions with which ext4 calls into JBD. 1963dcf5451SChristoph Hellwig */ 19790c7201bSTheodore Ts'o void ext4_journal_abort_handle(const char *caller, unsigned int line, 19890c7201bSTheodore Ts'o const char *err_fn, 1993dcf5451SChristoph Hellwig struct buffer_head *bh, handle_t *handle, int err); 2003dcf5451SChristoph Hellwig 20190c7201bSTheodore Ts'o int __ext4_journal_get_write_access(const char *where, unsigned int line, 20290c7201bSTheodore Ts'o handle_t *handle, struct buffer_head *bh); 2033dcf5451SChristoph Hellwig 20490c7201bSTheodore Ts'o int __ext4_forget(const char *where, unsigned int line, handle_t *handle, 20590c7201bSTheodore Ts'o int is_metadata, struct inode *inode, 20690c7201bSTheodore Ts'o struct buffer_head *bh, ext4_fsblk_t blocknr); 20790c7201bSTheodore Ts'o 20890c7201bSTheodore Ts'o int __ext4_journal_get_create_access(const char *where, unsigned int line, 20990c7201bSTheodore Ts'o handle_t *handle, struct buffer_head *bh); 21090c7201bSTheodore Ts'o 21190c7201bSTheodore Ts'o int __ext4_handle_dirty_metadata(const char *where, unsigned int line, 21290c7201bSTheodore Ts'o handle_t *handle, struct inode *inode, 21390c7201bSTheodore Ts'o struct buffer_head *bh); 21490c7201bSTheodore Ts'o 21590c7201bSTheodore Ts'o int __ext4_handle_dirty_super(const char *where, unsigned int line, 21690c7201bSTheodore Ts'o handle_t *handle, struct super_block *sb); 217a0375156STheodore Ts'o 2183dcf5451SChristoph Hellwig #define ext4_journal_get_write_access(handle, bh) \ 21990c7201bSTheodore Ts'o __ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh)) 220d6797d14STheodore Ts'o #define ext4_forget(handle, is_metadata, inode, bh, block_nr) \ 22190c7201bSTheodore Ts'o __ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \ 22290c7201bSTheodore Ts'o (bh), (block_nr)) 2233dcf5451SChristoph Hellwig #define ext4_journal_get_create_access(handle, bh) \ 22490c7201bSTheodore Ts'o __ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh)) 2250390131bSFrank Mayhar #define ext4_handle_dirty_metadata(handle, inode, bh) \ 22690c7201bSTheodore Ts'o __ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \ 22790c7201bSTheodore Ts'o (bh)) 228a0375156STheodore Ts'o #define ext4_handle_dirty_super(handle, sb) \ 22990c7201bSTheodore Ts'o __ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb)) 2303dcf5451SChristoph Hellwig 2313dcf5451SChristoph Hellwig handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks); 232c398eda0STheodore Ts'o int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle); 2333dcf5451SChristoph Hellwig 234d3d1faf6SCurt Wohlgemuth #define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096) 2350390131bSFrank Mayhar 236d3d1faf6SCurt Wohlgemuth /* Note: Do not use this for NULL handles. This is only to determine if 237d3d1faf6SCurt Wohlgemuth * a properly allocated handle is using a journal or not. */ 2380390131bSFrank Mayhar static inline int ext4_handle_valid(handle_t *handle) 2390390131bSFrank Mayhar { 240d3d1faf6SCurt Wohlgemuth if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT) 2410390131bSFrank Mayhar return 0; 2420390131bSFrank Mayhar return 1; 2430390131bSFrank Mayhar } 2440390131bSFrank Mayhar 2450390131bSFrank Mayhar static inline void ext4_handle_sync(handle_t *handle) 2460390131bSFrank Mayhar { 2470390131bSFrank Mayhar if (ext4_handle_valid(handle)) 2480390131bSFrank Mayhar handle->h_sync = 1; 2490390131bSFrank Mayhar } 2500390131bSFrank Mayhar 2510390131bSFrank Mayhar static inline void ext4_handle_release_buffer(handle_t *handle, 2520390131bSFrank Mayhar struct buffer_head *bh) 2530390131bSFrank Mayhar { 2540390131bSFrank Mayhar if (ext4_handle_valid(handle)) 2550390131bSFrank Mayhar jbd2_journal_release_buffer(handle, bh); 2560390131bSFrank Mayhar } 2570390131bSFrank Mayhar 2580390131bSFrank Mayhar static inline int ext4_handle_is_aborted(handle_t *handle) 2590390131bSFrank Mayhar { 2600390131bSFrank Mayhar if (ext4_handle_valid(handle)) 2610390131bSFrank Mayhar return is_handle_aborted(handle); 2620390131bSFrank Mayhar return 0; 2630390131bSFrank Mayhar } 2640390131bSFrank Mayhar 2650390131bSFrank Mayhar static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed) 2660390131bSFrank Mayhar { 2670390131bSFrank Mayhar if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed) 2680390131bSFrank Mayhar return 0; 2690390131bSFrank Mayhar return 1; 2700390131bSFrank Mayhar } 2710390131bSFrank Mayhar 2723dcf5451SChristoph Hellwig static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks) 2733dcf5451SChristoph Hellwig { 2743dcf5451SChristoph Hellwig return ext4_journal_start_sb(inode->i_sb, nblocks); 2753dcf5451SChristoph Hellwig } 2763dcf5451SChristoph Hellwig 2773dcf5451SChristoph Hellwig #define ext4_journal_stop(handle) \ 278c398eda0STheodore Ts'o __ext4_journal_stop(__func__, __LINE__, (handle)) 2793dcf5451SChristoph Hellwig 2803dcf5451SChristoph Hellwig static inline handle_t *ext4_journal_current_handle(void) 2813dcf5451SChristoph Hellwig { 2823dcf5451SChristoph Hellwig return journal_current_handle(); 2833dcf5451SChristoph Hellwig } 2843dcf5451SChristoph Hellwig 2853dcf5451SChristoph Hellwig static inline int ext4_journal_extend(handle_t *handle, int nblocks) 2863dcf5451SChristoph Hellwig { 2870390131bSFrank Mayhar if (ext4_handle_valid(handle)) 2883dcf5451SChristoph Hellwig return jbd2_journal_extend(handle, nblocks); 2890390131bSFrank Mayhar return 0; 2903dcf5451SChristoph Hellwig } 2913dcf5451SChristoph Hellwig 2923dcf5451SChristoph Hellwig static inline int ext4_journal_restart(handle_t *handle, int nblocks) 2933dcf5451SChristoph Hellwig { 2940390131bSFrank Mayhar if (ext4_handle_valid(handle)) 2953dcf5451SChristoph Hellwig return jbd2_journal_restart(handle, nblocks); 2960390131bSFrank Mayhar return 0; 2973dcf5451SChristoph Hellwig } 2983dcf5451SChristoph Hellwig 2993dcf5451SChristoph Hellwig static inline int ext4_journal_blocks_per_page(struct inode *inode) 3003dcf5451SChristoph Hellwig { 3010390131bSFrank Mayhar if (EXT4_JOURNAL(inode) != NULL) 3023dcf5451SChristoph Hellwig return jbd2_journal_blocks_per_page(inode); 3030390131bSFrank Mayhar return 0; 3043dcf5451SChristoph Hellwig } 3053dcf5451SChristoph Hellwig 3063dcf5451SChristoph Hellwig static inline int ext4_journal_force_commit(journal_t *journal) 3073dcf5451SChristoph Hellwig { 3080390131bSFrank Mayhar if (journal) 3093dcf5451SChristoph Hellwig return jbd2_journal_force_commit(journal); 3100390131bSFrank Mayhar return 0; 3113dcf5451SChristoph Hellwig } 3123dcf5451SChristoph Hellwig 313678aaf48SJan Kara static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) 314678aaf48SJan Kara { 3150390131bSFrank Mayhar if (ext4_handle_valid(handle)) 3168aefcd55STheodore Ts'o return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode); 3170390131bSFrank Mayhar return 0; 318678aaf48SJan Kara } 319678aaf48SJan Kara 320b436b9beSJan Kara static inline void ext4_update_inode_fsync_trans(handle_t *handle, 321b436b9beSJan Kara struct inode *inode, 322b436b9beSJan Kara int datasync) 323b436b9beSJan Kara { 324b436b9beSJan Kara struct ext4_inode_info *ei = EXT4_I(inode); 325b436b9beSJan Kara 326b436b9beSJan Kara if (ext4_handle_valid(handle)) { 327b436b9beSJan Kara ei->i_sync_tid = handle->h_transaction->t_tid; 328b436b9beSJan Kara if (datasync) 329b436b9beSJan Kara ei->i_datasync_tid = handle->h_transaction->t_tid; 330b436b9beSJan Kara } 331b436b9beSJan Kara } 332b436b9beSJan Kara 3333dcf5451SChristoph Hellwig /* super.c */ 3343dcf5451SChristoph Hellwig int ext4_force_commit(struct super_block *sb); 3353dcf5451SChristoph Hellwig 3363d2b1582SLukas Czerner /* 3373d2b1582SLukas Czerner * Ext4 inode journal modes 3383d2b1582SLukas Czerner */ 3393d2b1582SLukas Czerner #define EXT4_INODE_JOURNAL_DATA_MODE 0x01 /* journal data mode */ 3403d2b1582SLukas Czerner #define EXT4_INODE_ORDERED_DATA_MODE 0x02 /* ordered data mode */ 3413d2b1582SLukas Czerner #define EXT4_INODE_WRITEBACK_DATA_MODE 0x04 /* writeback data mode */ 3423d2b1582SLukas Czerner 3433d2b1582SLukas Czerner static inline int ext4_inode_journal_mode(struct inode *inode) 3443dcf5451SChristoph Hellwig { 3450390131bSFrank Mayhar if (EXT4_JOURNAL(inode) == NULL) 3463d2b1582SLukas Czerner return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */ 3473d2b1582SLukas Czerner /* We do not support data journalling with delayed allocation */ 3483d2b1582SLukas Czerner if (!S_ISREG(inode->i_mode) || 3493d2b1582SLukas Czerner test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 3503d2b1582SLukas Czerner return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */ 3513d2b1582SLukas Czerner if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) && 3523d2b1582SLukas Czerner !test_opt(inode->i_sb, DELALLOC)) 3533d2b1582SLukas Czerner return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */ 3543d2b1582SLukas Czerner if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 3553d2b1582SLukas Czerner return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */ 3563d2b1582SLukas Czerner if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 3573d2b1582SLukas Czerner return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */ 3583d2b1582SLukas Czerner else 3593d2b1582SLukas Czerner BUG(); 3603d2b1582SLukas Czerner } 3613d2b1582SLukas Czerner 3623d2b1582SLukas Czerner static inline int ext4_should_journal_data(struct inode *inode) 3633d2b1582SLukas Czerner { 3643d2b1582SLukas Czerner return ext4_inode_journal_mode(inode) & EXT4_INODE_JOURNAL_DATA_MODE; 3653dcf5451SChristoph Hellwig } 3663dcf5451SChristoph Hellwig 3673dcf5451SChristoph Hellwig static inline int ext4_should_order_data(struct inode *inode) 3683dcf5451SChristoph Hellwig { 3693d2b1582SLukas Czerner return ext4_inode_journal_mode(inode) & EXT4_INODE_ORDERED_DATA_MODE; 3703dcf5451SChristoph Hellwig } 3713dcf5451SChristoph Hellwig 3723dcf5451SChristoph Hellwig static inline int ext4_should_writeback_data(struct inode *inode) 3733dcf5451SChristoph Hellwig { 3743d2b1582SLukas Czerner return ext4_inode_journal_mode(inode) & EXT4_INODE_WRITEBACK_DATA_MODE; 3753dcf5451SChristoph Hellwig } 3763dcf5451SChristoph Hellwig 377744692dcSJiaying Zhang /* 378744692dcSJiaying Zhang * This function controls whether or not we should try to go down the 379744692dcSJiaying Zhang * dioread_nolock code paths, which makes it safe to avoid taking 380744692dcSJiaying Zhang * i_mutex for direct I/O reads. This only works for extent-based 381206f7ab4SChristoph Hellwig * files, and it doesn't work if data journaling is enabled, since the 382206f7ab4SChristoph Hellwig * dioread_nolock code uses b_private to pass information back to the 383206f7ab4SChristoph Hellwig * I/O completion handler, and this conflicts with the jbd's use of 384206f7ab4SChristoph Hellwig * b_private. 385744692dcSJiaying Zhang */ 386744692dcSJiaying Zhang static inline int ext4_should_dioread_nolock(struct inode *inode) 387744692dcSJiaying Zhang { 388744692dcSJiaying Zhang if (!test_opt(inode->i_sb, DIOREAD_NOLOCK)) 389744692dcSJiaying Zhang return 0; 390744692dcSJiaying Zhang if (!S_ISREG(inode->i_mode)) 391744692dcSJiaying Zhang return 0; 39212e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 393744692dcSJiaying Zhang return 0; 394744692dcSJiaying Zhang if (ext4_should_journal_data(inode)) 395744692dcSJiaying Zhang return 0; 396744692dcSJiaying Zhang return 1; 397744692dcSJiaying Zhang } 398744692dcSJiaying Zhang 3993dcf5451SChristoph Hellwig #endif /* _EXT4_JBD2_H */ 400