+++ /dev/null
-/*
- * linux/include/linux/ext4_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.
- *
- * Ext4-specific journaling extensions.
- */
-
-#ifndef _LINUX_EXT4_JBD_H
-#define _LINUX_EXT4_JBD_H
-
-#include <linux/fs.h>
-#include <linux/jbd.h>
-#include <linux/ext4_fs.h>
-
-#define EXT4_JOURNAL(inode) (EXT4_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 EXT4_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 EXT4_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 EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS + \
- EXT4_XATTR_TRANS_BLOCKS - 2 + \
- 2*EXT4_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 EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_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 EXT4_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 EXT4_RESERVE_TRANS_BLOCKS 12U
-
-#define EXT4_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 EXT4_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 EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
- (EXT4_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
-#define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
- (EXT4_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
-#else
-#define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
-#define EXT4_QUOTA_INIT_BLOCKS(sb) 0
-#define EXT4_QUOTA_DEL_BLOCKS(sb) 0
-#endif
-
-int
-ext4_mark_iloc_dirty(handle_t *handle,
- struct inode *inode,
- struct ext4_iloc *iloc);
-
-/*
- * On success, We end up with an outstanding reference count against
- * iloc->bh. This _must_ be cleaned up later.
- */
-
-int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
- struct ext4_iloc *iloc);
-
-int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
-
-/*
- * Wrapper functions with which ext4 calls into JBD. The intent here is
- * to allow these to be turned into appropriate stubs so ext4 can control
- * ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't
- * been done yet.
- */
-
-void ext4_journal_abort_handle(const char *caller, const char *err_fn,
- struct buffer_head *bh, handle_t *handle, int err);
-
-static inline int
-__ext4_journal_get_undo_access(const char *where, handle_t *handle,
- struct buffer_head *bh)
-{
- int err = journal_get_undo_access(handle, bh);
- if (err)
- ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
- return err;
-}
-
-static inline int
-__ext4_journal_get_write_access(const char *where, handle_t *handle,
- struct buffer_head *bh)
-{
- int err = journal_get_write_access(handle, bh);
- if (err)
- ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
- return err;
-}
-
-static inline void
-ext4_journal_release_buffer(handle_t *handle, struct buffer_head *bh)
-{
- journal_release_buffer(handle, bh);
-}
-
-static inline int
-__ext4_journal_forget(const char *where, handle_t *handle, struct buffer_head *bh)
-{
- int err = journal_forget(handle, bh);
- if (err)
- ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
- return err;
-}
-
-static inline int
-__ext4_journal_revoke(const char *where, handle_t *handle,
- unsigned long blocknr, struct buffer_head *bh)
-{
- int err = journal_revoke(handle, blocknr, bh);
- if (err)
- ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
- return err;
-}
-
-static inline int
-__ext4_journal_get_create_access(const char *where,
- handle_t *handle, struct buffer_head *bh)
-{
- int err = journal_get_create_access(handle, bh);
- if (err)
- ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
- return err;
-}
-
-static inline int
-__ext4_journal_dirty_metadata(const char *where,
- handle_t *handle, struct buffer_head *bh)
-{
- int err = journal_dirty_metadata(handle, bh);
- if (err)
- ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
- return err;
-}
-
-
-#define ext4_journal_get_undo_access(handle, bh) \
- __ext4_journal_get_undo_access(__FUNCTION__, (handle), (bh))
-#define ext4_journal_get_write_access(handle, bh) \
- __ext4_journal_get_write_access(__FUNCTION__, (handle), (bh))
-#define ext4_journal_revoke(handle, blocknr, bh) \
- __ext4_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
-#define ext4_journal_get_create_access(handle, bh) \
- __ext4_journal_get_create_access(__FUNCTION__, (handle), (bh))
-#define ext4_journal_dirty_metadata(handle, bh) \
- __ext4_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
-#define ext4_journal_forget(handle, bh) \
- __ext4_journal_forget(__FUNCTION__, (handle), (bh))
-
-int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
-
-handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
-int __ext4_journal_stop(const char *where, handle_t *handle);
-
-static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks)
-{
- return ext4_journal_start_sb(inode->i_sb, nblocks);
-}
-
-#define ext4_journal_stop(handle) \
- __ext4_journal_stop(__FUNCTION__, (handle))
-
-static inline handle_t *ext4_journal_current_handle(void)
-{
- return journal_current_handle();
-}
-
-static inline int ext4_journal_extend(handle_t *handle, int nblocks)
-{
- return journal_extend(handle, nblocks);
-}
-
-static inline int ext4_journal_restart(handle_t *handle, int nblocks)
-{
- return journal_restart(handle, nblocks);
-}
-
-static inline int ext4_journal_blocks_per_page(struct inode *inode)
-{
- return journal_blocks_per_page(inode);
-}
-
-static inline int ext4_journal_force_commit(journal_t *journal)
-{
- return journal_force_commit(journal);
-}
-
-/* super.c */
-int ext4_force_commit(struct super_block *sb);
-
-static inline int ext4_should_journal_data(struct inode *inode)
-{
- if (!S_ISREG(inode->i_mode))
- return 1;
- if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
- return 1;
- if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
- return 1;
- return 0;
-}
-
-static inline int ext4_should_order_data(struct inode *inode)
-{
- if (!S_ISREG(inode->i_mode))
- return 0;
- if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
- return 0;
- if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
- return 1;
- return 0;
-}
-
-static inline int ext4_should_writeback_data(struct inode *inode)
-{
- if (!S_ISREG(inode->i_mode))
- return 0;
- if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
- return 0;
- if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
- return 1;
- return 0;
-}
-
-#endif /* _LINUX_EXT4_JBD_H */
git.openpandora.org / pandora-kernel.git / commitdiff