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/* * linux/include/linux/ext3_jbd.h * * Written by Stephen C. Tweedie <sct@redhat.com>, 1999 * * Copyright 1998--1999 Red Hat corp --- All Rights Reserved * * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your * option, any later version, incorporated herein by reference. * * Ext3-specific journaling extensions. */ #ifndef _LINUX_EXT3_JBD_H #define _LINUX_EXT3_JBD_H #include <linux/fs.h> #include <linux/jbd.h> #include <linux/ext3_fs.h> #define EXT3_JOURNAL(inode) (EXT3_SB((inode)->i_sb)->s_journal) /* Define the number of blocks we need to account to a transaction to * modify one block of data. * * We may have to touch one inode, one bitmap buffer, up to three * indirection blocks, the group and superblock summaries, and the data * block to complete the transaction. */ #define EXT3_SINGLEDATA_TRANS_BLOCKS 8U /* Extended attribute operations touch at most two data buffers, * two bitmap buffers, and two group summaries, in addition to the inode * and the superblock, which are already accounted for. */ #define EXT3_XATTR_TRANS_BLOCKS 6U /* Define the minimum size for a transaction which modifies data. This * needs to take into account the fact that we may end up modifying two * quota files too (one for the group, one for the user quota). The * superblock only gets updated once, of course, so don't bother * counting that again for the quota updates. */ #define EXT3_DATA_TRANS_BLOCKS(sb) (EXT3_SINGLEDATA_TRANS_BLOCKS + \ EXT3_XATTR_TRANS_BLOCKS - 2 + \ 2*EXT3_QUOTA_TRANS_BLOCKS(sb)) /* Delete operations potentially hit one directory's namespace plus an * entire inode, plus arbitrary amounts of bitmap/indirection data. Be * generous. We can grow the delete transaction later if necessary. */ #define EXT3_DELETE_TRANS_BLOCKS(sb) (2 * EXT3_DATA_TRANS_BLOCKS(sb) + 64) /* Define an arbitrary limit for the amount of data we will anticipate * writing to any given transaction. For unbounded transactions such as * write(2) and truncate(2) we can write more than this, but we always * start off at the maximum transaction size and grow the transaction * optimistically as we go. */ #define EXT3_MAX_TRANS_DATA 64U /* We break up a large truncate or write transaction once the handle's * buffer credits gets this low, we need either to extend the * transaction or to start a new one. Reserve enough space here for * inode, bitmap, superblock, group and indirection updates for at least * one block, plus two quota updates. Quota allocations are not * needed. */ #define EXT3_RESERVE_TRANS_BLOCKS 12U #define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8 #ifdef CONFIG_QUOTA /* Amount of blocks needed for quota update - we know that the structure was * allocated so we need to update only inode+data */ #define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0) /* Amount of blocks needed for quota insert/delete - we do some block writes * but inode, sb and group updates are done only once */ #define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\ (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0) #define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0) #else #define EXT3_QUOTA_TRANS_BLOCKS(sb) 0 #define EXT3_QUOTA_INIT_BLOCKS(sb) 0 #define EXT3_QUOTA_DEL_BLOCKS(sb) 0 #endif int ext3_mark_iloc_dirty(handle_t *handle, struct inode *inode, struct ext3_iloc *iloc); /* * On success, We end up with an outstanding reference count against * iloc->bh. This _must_ be cleaned up later. */ int ext3_reserve_inode_write(handle_t *handle, struct inode *inode, struct ext3_iloc *iloc); int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode); /* * Wrapper functions with which ext3 calls into JBD. The intent here is * to allow these to be turned into appropriate stubs so ext3 can control * ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't * been done yet. */ void ext3_journal_abort_handle(const char *caller, const char *err_fn, struct buffer_head *bh, handle_t *handle, int err); static inline int __ext3_journal_get_undo_access(const char *where, handle_t *handle, struct buffer_head *bh) { int err = journal_get_undo_access(handle, bh); if (err) ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err); return err; } static inline int __ext3_journal_get_write_access(const char *where, handle_t *handle, struct buffer_head *bh) { int err = journal_get_write_access(handle, bh); if (err) ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err); return err; } static inline void ext3_journal_release_buffer(handle_t *handle, struct buffer_head *bh) { journal_release_buffer(handle, bh); } static inline int __ext3_journal_forget(const char *where, handle_t *handle, struct buffer_head *bh) { int err = journal_forget(handle, bh); if (err) ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err); return err; } static inline int __ext3_journal_revoke(const char *where, handle_t *handle, unsigned long blocknr, struct buffer_head *bh) { int err = journal_revoke(handle, blocknr, bh); if (err) ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err); return err; } static inline int __ext3_journal_get_create_access(const char *where, handle_t *handle, struct buffer_head *bh) { int err = journal_get_create_access(handle, bh); if (err) ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err); return err; } static inline int __ext3_journal_dirty_metadata(const char *where, handle_t *handle, struct buffer_head *bh) { int err = journal_dirty_metadata(handle, bh); if (err) ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err); return err; } #define ext3_journal_get_undo_access(handle, bh) \ __ext3_journal_get_undo_access(__FUNCTION__, (handle), (bh)) #define ext3_journal_get_write_access(handle, bh) \ __ext3_journal_get_write_access(__FUNCTION__, (handle), (bh)) #define ext3_journal_revoke(handle, blocknr, bh) \ __ext3_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh)) #define ext3_journal_get_create_access(handle, bh) \ __ext3_journal_get_create_access(__FUNCTION__, (handle), (bh)) #define ext3_journal_dirty_metadata(handle, bh) \ __ext3_journal_dirty_metadata(__FUNCTION__, (handle), (bh)) #define ext3_journal_forget(handle, bh) \ __ext3_journal_forget(__FUNCTION__, (handle), (bh)) int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh); handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks); int __ext3_journal_stop(const char *where, handle_t *handle); static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks) { return ext3_journal_start_sb(inode->i_sb, nblocks); } #define ext3_journal_stop(handle) \ __ext3_journal_stop(__FUNCTION__, (handle)) static inline handle_t *ext3_journal_current_handle(void) { return journal_current_handle(); } static inline int ext3_journal_extend(handle_t *handle, int nblocks) { return journal_extend(handle, nblocks); } static inline int ext3_journal_restart(handle_t *handle, int nblocks) { return journal_restart(handle, nblocks); } static inline int ext3_journal_blocks_per_page(struct inode *inode) { return journal_blocks_per_page(inode); } static inline int ext3_journal_force_commit(journal_t *journal) { return journal_force_commit(journal); } /* super.c */ int ext3_force_commit(struct super_block *sb); static inline int ext3_should_journal_data(struct inode *inode) { if (!S_ISREG(inode->i_mode)) return 1; if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA) return 1; if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL) return 1; return 0; } static inline int ext3_should_order_data(struct inode *inode) { if (!S_ISREG(inode->i_mode)) return 0; if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL) return 0; if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA) return 1; return 0; } static inline int ext3_should_writeback_data(struct inode *inode) { if (!S_ISREG(inode->i_mode)) return 0; if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL) return 0; if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA) return 1; return 0; } #endif /* _LINUX_EXT3_JBD_H */