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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 8
/* 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 64
/* 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 12
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 */
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