/* * linux/include/linux/ext3_jbd.h * * Written by Stephen C. Tweedie , 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 #include #include #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 /* 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 (3 * EXT3_SINGLEDATA_TRANS_BLOCKS - 2) extern int ext3_writepage_trans_blocks(struct inode *inode); /* 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 (2 * EXT3_DATA_TRANS_BLOCKS + 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 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. */ static inline void ext3_journal_abort_handle(const char *caller, const char *err_fn, struct buffer_head *bh, handle_t *handle, int err) { char nbuf[16]; const char *errstr = ext3_decode_error(NULL, err, nbuf); printk(KERN_ERR "%s: aborting transaction: %s in %s", caller, errstr, err_fn); if (bh) BUFFER_TRACE(bh, "abort"); journal_abort_handle(handle); if (!handle->h_err) handle->h_err = 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 int __ext3_journal_dirty_data(const char *where, handle_t *handle, struct buffer_head *bh, int async) { int err = journal_dirty_data(handle, bh, async); if (err) ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err); return err; } static inline void ext3_journal_forget(handle_t *handle, struct buffer_head *bh) { journal_forget(handle, bh); } 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_dirty_data(handle, bh, async) \ __ext3_journal_dirty_data(__FUNCTION__, (handle), (bh), (async)) #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)) /* * Wrappers for journal_start/end. * * The only special thing we need to do here is to make sure that all * journal_end calls result in the superblock being marked dirty, so * that sync() will call the filesystem's write_super callback if * appropriate. */ static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks) { journal_t *journal; if (inode->i_sb->s_flags & MS_RDONLY) return ERR_PTR(-EROFS); /* Special case here: if the journal has aborted behind our * backs (eg. EIO in the commit thread), then we still need to * take the FS itself readonly cleanly. */ journal = EXT3_JOURNAL(inode); if (is_journal_aborted(journal)) { ext3_abort(inode->i_sb, __FUNCTION__, "Detected aborted journal"); return ERR_PTR(-EROFS); } return journal_start(journal, nblocks); } static inline handle_t * ext3_journal_try_start(struct inode *inode, int nblocks) { if (inode->i_sb->s_flags & MS_RDONLY) return ERR_PTR(-EROFS); return journal_try_start(EXT3_JOURNAL(inode), nblocks); } /* * The only special thing we need to do here is to make sure that all * journal_stop calls result in the superblock being marked dirty, so * that sync() will call the filesystem's write_super callback if * appropriate. */ static inline int __ext3_journal_stop(const char *where, handle_t *handle, struct inode *inode) { int err = handle->h_err; int rc = journal_stop(handle); inode->i_sb->s_dirt = 1; if (!err) err = rc; if (err) __ext3_std_error(inode->i_sb, where, err); return err; } #define ext3_journal_stop(handle, inode) \ __ext3_journal_stop(__FUNCTION__, (handle), (inode)) static inline handle_t *ext3_journal_current_handle(void) { return journal_current_handle(); } static inline void ext3_log_start_commit(journal_t *journal, transaction_t *transaction) { log_start_commit(journal, transaction); } static inline void ext3_log_wait_commit(journal_t *journal, tid_t tid) { log_wait_commit(journal, tid); } 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 (inode->u.ext3_i.i_flags & EXT3_JOURNAL_DATA_FL) return 1; return 0; } static inline int ext3_should_order_data(struct inode *inode) { return (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA); } #endif /* _LINUX_EXT3_JBD_H */