original development tree for Linux kernel GTP module; now long in mainline.
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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. */
/* 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 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. */
/* 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 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. */
/* 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. */
/* 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*\
#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
#define EXT3_QUOTA_INIT_BLOCKS(sb) 0
#define EXT3_QUOTA_DEL_BLOCKS(sb) 0
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_release_buffer(handle_t *handle,
struct buffer_head *bh)
journal_release_buffer(handle, bh);
void ext3_journal_abort_handle(const char *caller, const char *err_fn,
struct buffer_head *bh, handle_t *handle, int err);
int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
struct buffer_head *bh);
int __ext3_journal_get_write_access(const char *where, handle_t *handle,
struct buffer_head *bh);
int __ext3_journal_forget(const char *where, handle_t *handle,
struct buffer_head *bh);
int __ext3_journal_revoke(const char *where, handle_t *handle,
unsigned long blocknr, struct buffer_head *bh);
int __ext3_journal_get_create_access(const char *where,
handle_t *handle, struct buffer_head *bh);
int __ext3_journal_dirty_metadata(const char *where,
handle_t *handle, struct buffer_head *bh);
#define ext3_journal_get_undo_access(handle, bh) \
__ext3_journal_get_undo_access(__func__, (handle), (bh))
#define ext3_journal_get_write_access(handle, bh) \
__ext3_journal_get_write_access(__func__, (handle), (bh))
#define ext3_journal_revoke(handle, blocknr, bh) \
__ext3_journal_revoke(__func__, (handle), (blocknr), (bh))
#define ext3_journal_get_create_access(handle, bh) \
__ext3_journal_get_create_access(__func__, (handle), (bh))
#define ext3_journal_dirty_metadata(handle, bh) \
__ext3_journal_dirty_metadata(__func__, (handle), (bh))
#define ext3_journal_forget(handle, bh) \
__ext3_journal_forget(__func__, (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(__func__, (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 */