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) \ 363dcf5451SChristoph Hellwig || test_opt(sb, EXTENTS) ? 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 + \ 523dcf5451SChristoph Hellwig 2*EXT4_QUOTA_TRANS_BLOCKS(sb)) 533dcf5451SChristoph Hellwig 543dcf5451SChristoph Hellwig /* Delete operations potentially hit one directory's namespace plus an 553dcf5451SChristoph Hellwig * entire inode, plus arbitrary amounts of bitmap/indirection data. Be 563dcf5451SChristoph Hellwig * generous. We can grow the delete transaction later if necessary. */ 573dcf5451SChristoph Hellwig 583dcf5451SChristoph Hellwig #define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64) 593dcf5451SChristoph Hellwig 603dcf5451SChristoph Hellwig /* Define an arbitrary limit for the amount of data we will anticipate 613dcf5451SChristoph Hellwig * writing to any given transaction. For unbounded transactions such as 623dcf5451SChristoph Hellwig * write(2) and truncate(2) we can write more than this, but we always 633dcf5451SChristoph Hellwig * start off at the maximum transaction size and grow the transaction 643dcf5451SChristoph Hellwig * optimistically as we go. */ 653dcf5451SChristoph Hellwig 663dcf5451SChristoph Hellwig #define EXT4_MAX_TRANS_DATA 64U 673dcf5451SChristoph Hellwig 683dcf5451SChristoph Hellwig /* We break up a large truncate or write transaction once the handle's 693dcf5451SChristoph Hellwig * buffer credits gets this low, we need either to extend the 703dcf5451SChristoph Hellwig * transaction or to start a new one. Reserve enough space here for 713dcf5451SChristoph Hellwig * inode, bitmap, superblock, group and indirection updates for at least 723dcf5451SChristoph Hellwig * one block, plus two quota updates. Quota allocations are not 733dcf5451SChristoph Hellwig * needed. */ 743dcf5451SChristoph Hellwig 753dcf5451SChristoph Hellwig #define EXT4_RESERVE_TRANS_BLOCKS 12U 763dcf5451SChristoph Hellwig 773dcf5451SChristoph Hellwig #define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8 783dcf5451SChristoph Hellwig 793dcf5451SChristoph Hellwig #ifdef CONFIG_QUOTA 803dcf5451SChristoph Hellwig /* Amount of blocks needed for quota update - we know that the structure was 813dcf5451SChristoph Hellwig * allocated so we need to update only inode+data */ 823dcf5451SChristoph Hellwig #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0) 833dcf5451SChristoph Hellwig /* Amount of blocks needed for quota insert/delete - we do some block writes 843dcf5451SChristoph Hellwig * but inode, sb and group updates are done only once */ 853dcf5451SChristoph Hellwig #define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\ 863dcf5451SChristoph Hellwig (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0) 873dcf5451SChristoph Hellwig #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ 883dcf5451SChristoph Hellwig (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0) 893dcf5451SChristoph Hellwig #else 903dcf5451SChristoph Hellwig #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0 913dcf5451SChristoph Hellwig #define EXT4_QUOTA_INIT_BLOCKS(sb) 0 923dcf5451SChristoph Hellwig #define EXT4_QUOTA_DEL_BLOCKS(sb) 0 933dcf5451SChristoph Hellwig #endif 943dcf5451SChristoph Hellwig 953dcf5451SChristoph Hellwig int 963dcf5451SChristoph Hellwig ext4_mark_iloc_dirty(handle_t *handle, 973dcf5451SChristoph Hellwig struct inode *inode, 983dcf5451SChristoph Hellwig struct ext4_iloc *iloc); 993dcf5451SChristoph Hellwig 1003dcf5451SChristoph Hellwig /* 1013dcf5451SChristoph Hellwig * On success, We end up with an outstanding reference count against 1023dcf5451SChristoph Hellwig * iloc->bh. This _must_ be cleaned up later. 1033dcf5451SChristoph Hellwig */ 1043dcf5451SChristoph Hellwig 1053dcf5451SChristoph Hellwig int ext4_reserve_inode_write(handle_t *handle, struct inode *inode, 1063dcf5451SChristoph Hellwig struct ext4_iloc *iloc); 1073dcf5451SChristoph Hellwig 1083dcf5451SChristoph Hellwig int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode); 1093dcf5451SChristoph Hellwig 1103dcf5451SChristoph Hellwig /* 1113dcf5451SChristoph Hellwig * Wrapper functions with which ext4 calls into JBD. The intent here is 1123dcf5451SChristoph Hellwig * to allow these to be turned into appropriate stubs so ext4 can control 1133dcf5451SChristoph Hellwig * ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't 1143dcf5451SChristoph Hellwig * been done yet. 1153dcf5451SChristoph Hellwig */ 1163dcf5451SChristoph Hellwig 1173dcf5451SChristoph Hellwig static inline void ext4_journal_release_buffer(handle_t *handle, 1183dcf5451SChristoph Hellwig struct buffer_head *bh) 1193dcf5451SChristoph Hellwig { 1203dcf5451SChristoph Hellwig jbd2_journal_release_buffer(handle, bh); 1213dcf5451SChristoph Hellwig } 1223dcf5451SChristoph Hellwig 1233dcf5451SChristoph Hellwig void ext4_journal_abort_handle(const char *caller, const char *err_fn, 1243dcf5451SChristoph Hellwig struct buffer_head *bh, handle_t *handle, int err); 1253dcf5451SChristoph Hellwig 1263dcf5451SChristoph Hellwig int __ext4_journal_get_undo_access(const char *where, handle_t *handle, 1273dcf5451SChristoph Hellwig struct buffer_head *bh); 1283dcf5451SChristoph Hellwig 1293dcf5451SChristoph Hellwig int __ext4_journal_get_write_access(const char *where, handle_t *handle, 1303dcf5451SChristoph Hellwig struct buffer_head *bh); 1313dcf5451SChristoph Hellwig 1323dcf5451SChristoph Hellwig int __ext4_journal_forget(const char *where, handle_t *handle, 1333dcf5451SChristoph Hellwig struct buffer_head *bh); 1343dcf5451SChristoph Hellwig 1353dcf5451SChristoph Hellwig int __ext4_journal_revoke(const char *where, handle_t *handle, 1363dcf5451SChristoph Hellwig ext4_fsblk_t blocknr, struct buffer_head *bh); 1373dcf5451SChristoph Hellwig 1383dcf5451SChristoph Hellwig int __ext4_journal_get_create_access(const char *where, 1393dcf5451SChristoph Hellwig handle_t *handle, struct buffer_head *bh); 1403dcf5451SChristoph Hellwig 1413dcf5451SChristoph Hellwig int __ext4_journal_dirty_metadata(const char *where, 1423dcf5451SChristoph Hellwig handle_t *handle, struct buffer_head *bh); 1433dcf5451SChristoph Hellwig 1443dcf5451SChristoph Hellwig #define ext4_journal_get_undo_access(handle, bh) \ 1454db9c54aSStoyan Gaydarov __ext4_journal_get_undo_access(__func__, (handle), (bh)) 1463dcf5451SChristoph Hellwig #define ext4_journal_get_write_access(handle, bh) \ 1474db9c54aSStoyan Gaydarov __ext4_journal_get_write_access(__func__, (handle), (bh)) 1483dcf5451SChristoph Hellwig #define ext4_journal_revoke(handle, blocknr, bh) \ 1494db9c54aSStoyan Gaydarov __ext4_journal_revoke(__func__, (handle), (blocknr), (bh)) 1503dcf5451SChristoph Hellwig #define ext4_journal_get_create_access(handle, bh) \ 1514db9c54aSStoyan Gaydarov __ext4_journal_get_create_access(__func__, (handle), (bh)) 1523dcf5451SChristoph Hellwig #define ext4_journal_dirty_metadata(handle, bh) \ 1534db9c54aSStoyan Gaydarov __ext4_journal_dirty_metadata(__func__, (handle), (bh)) 1543dcf5451SChristoph Hellwig #define ext4_journal_forget(handle, bh) \ 1554db9c54aSStoyan Gaydarov __ext4_journal_forget(__func__, (handle), (bh)) 1563dcf5451SChristoph Hellwig 1573dcf5451SChristoph Hellwig handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks); 1583dcf5451SChristoph Hellwig int __ext4_journal_stop(const char *where, handle_t *handle); 1593dcf5451SChristoph Hellwig 1603dcf5451SChristoph Hellwig static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks) 1613dcf5451SChristoph Hellwig { 1623dcf5451SChristoph Hellwig return ext4_journal_start_sb(inode->i_sb, nblocks); 1633dcf5451SChristoph Hellwig } 1643dcf5451SChristoph Hellwig 1653dcf5451SChristoph Hellwig #define ext4_journal_stop(handle) \ 1664db9c54aSStoyan Gaydarov __ext4_journal_stop(__func__, (handle)) 1673dcf5451SChristoph Hellwig 1683dcf5451SChristoph Hellwig static inline handle_t *ext4_journal_current_handle(void) 1693dcf5451SChristoph Hellwig { 1703dcf5451SChristoph Hellwig return journal_current_handle(); 1713dcf5451SChristoph Hellwig } 1723dcf5451SChristoph Hellwig 1733dcf5451SChristoph Hellwig static inline int ext4_journal_extend(handle_t *handle, int nblocks) 1743dcf5451SChristoph Hellwig { 1753dcf5451SChristoph Hellwig return jbd2_journal_extend(handle, nblocks); 1763dcf5451SChristoph Hellwig } 1773dcf5451SChristoph Hellwig 1783dcf5451SChristoph Hellwig static inline int ext4_journal_restart(handle_t *handle, int nblocks) 1793dcf5451SChristoph Hellwig { 1803dcf5451SChristoph Hellwig return jbd2_journal_restart(handle, nblocks); 1813dcf5451SChristoph Hellwig } 1823dcf5451SChristoph Hellwig 1833dcf5451SChristoph Hellwig static inline int ext4_journal_blocks_per_page(struct inode *inode) 1843dcf5451SChristoph Hellwig { 1853dcf5451SChristoph Hellwig return jbd2_journal_blocks_per_page(inode); 1863dcf5451SChristoph Hellwig } 1873dcf5451SChristoph Hellwig 1883dcf5451SChristoph Hellwig static inline int ext4_journal_force_commit(journal_t *journal) 1893dcf5451SChristoph Hellwig { 1903dcf5451SChristoph Hellwig return jbd2_journal_force_commit(journal); 1913dcf5451SChristoph Hellwig } 1923dcf5451SChristoph Hellwig 193678aaf48SJan Kara static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) 194678aaf48SJan Kara { 195678aaf48SJan Kara return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode); 196678aaf48SJan Kara } 197678aaf48SJan Kara 1983dcf5451SChristoph Hellwig /* super.c */ 1993dcf5451SChristoph Hellwig int ext4_force_commit(struct super_block *sb); 2003dcf5451SChristoph Hellwig 2013dcf5451SChristoph Hellwig static inline int ext4_should_journal_data(struct inode *inode) 2023dcf5451SChristoph Hellwig { 2033dcf5451SChristoph Hellwig if (!S_ISREG(inode->i_mode)) 2043dcf5451SChristoph Hellwig return 1; 2053dcf5451SChristoph Hellwig if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 2063dcf5451SChristoph Hellwig return 1; 2073dcf5451SChristoph Hellwig if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) 2083dcf5451SChristoph Hellwig return 1; 2093dcf5451SChristoph Hellwig return 0; 2103dcf5451SChristoph Hellwig } 2113dcf5451SChristoph Hellwig 2123dcf5451SChristoph Hellwig static inline int ext4_should_order_data(struct inode *inode) 2133dcf5451SChristoph Hellwig { 2143dcf5451SChristoph Hellwig if (!S_ISREG(inode->i_mode)) 2153dcf5451SChristoph Hellwig return 0; 2163dcf5451SChristoph Hellwig if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) 2173dcf5451SChristoph Hellwig return 0; 2183dcf5451SChristoph Hellwig if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 2193dcf5451SChristoph Hellwig return 1; 2203dcf5451SChristoph Hellwig return 0; 2213dcf5451SChristoph Hellwig } 2223dcf5451SChristoph Hellwig 2233dcf5451SChristoph Hellwig static inline int ext4_should_writeback_data(struct inode *inode) 2243dcf5451SChristoph Hellwig { 2253dcf5451SChristoph Hellwig if (!S_ISREG(inode->i_mode)) 2263dcf5451SChristoph Hellwig return 0; 2273dcf5451SChristoph Hellwig if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) 2283dcf5451SChristoph Hellwig return 0; 2293dcf5451SChristoph Hellwig if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 2303dcf5451SChristoph Hellwig return 1; 2313dcf5451SChristoph Hellwig return 0; 2323dcf5451SChristoph Hellwig } 2333dcf5451SChristoph Hellwig 2343dcf5451SChristoph Hellwig #endif /* _EXT4_JBD2_H */ 235