forked from mirrors/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
265 lines
8 KiB
C
265 lines
8 KiB
C
/*
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* linux/include/linux/ext3_jbd.h
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*
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* Written by Stephen C. Tweedie <sct@redhat.com>, 1999
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*
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* Copyright 1998--1999 Red Hat corp --- All Rights Reserved
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*
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* This file is part of the Linux kernel and is made available under
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* the terms of the GNU General Public License, version 2, or at your
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* option, any later version, incorporated herein by reference.
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*
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* Ext3-specific journaling extensions.
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*/
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#ifndef _LINUX_EXT3_JBD_H
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#define _LINUX_EXT3_JBD_H
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#include <linux/fs.h>
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#include <linux/jbd.h>
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#include <linux/ext3_fs.h>
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#define EXT3_JOURNAL(inode) (EXT3_SB((inode)->i_sb)->s_journal)
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/* Define the number of blocks we need to account to a transaction to
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* modify one block of data.
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*
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* We may have to touch one inode, one bitmap buffer, up to three
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* indirection blocks, the group and superblock summaries, and the data
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* block to complete the transaction. */
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#define EXT3_SINGLEDATA_TRANS_BLOCKS 8U
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/* Extended attribute operations touch at most two data buffers,
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* two bitmap buffers, and two group summaries, in addition to the inode
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* and the superblock, which are already accounted for. */
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#define EXT3_XATTR_TRANS_BLOCKS 6U
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/* Define the minimum size for a transaction which modifies data. This
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* needs to take into account the fact that we may end up modifying two
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* quota files too (one for the group, one for the user quota). The
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* superblock only gets updated once, of course, so don't bother
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* counting that again for the quota updates. */
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#define EXT3_DATA_TRANS_BLOCKS (EXT3_SINGLEDATA_TRANS_BLOCKS + \
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EXT3_XATTR_TRANS_BLOCKS - 2 + \
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2*EXT3_QUOTA_TRANS_BLOCKS)
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/* Delete operations potentially hit one directory's namespace plus an
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* entire inode, plus arbitrary amounts of bitmap/indirection data. Be
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* generous. We can grow the delete transaction later if necessary. */
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#define EXT3_DELETE_TRANS_BLOCKS (2 * EXT3_DATA_TRANS_BLOCKS + 64)
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/* Define an arbitrary limit for the amount of data we will anticipate
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* writing to any given transaction. For unbounded transactions such as
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* write(2) and truncate(2) we can write more than this, but we always
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* start off at the maximum transaction size and grow the transaction
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* optimistically as we go. */
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#define EXT3_MAX_TRANS_DATA 64U
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/* We break up a large truncate or write transaction once the handle's
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* buffer credits gets this low, we need either to extend the
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* transaction or to start a new one. Reserve enough space here for
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* inode, bitmap, superblock, group and indirection updates for at least
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* one block, plus two quota updates. Quota allocations are not
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* needed. */
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#define EXT3_RESERVE_TRANS_BLOCKS 12U
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#define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8
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#ifdef CONFIG_QUOTA
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/* Amount of blocks needed for quota update - we know that the structure was
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* allocated so we need to update only inode+data */
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#define EXT3_QUOTA_TRANS_BLOCKS 2
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/* Amount of blocks needed for quota insert/delete - we do some block writes
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* but inode, sb and group updates are done only once */
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#define EXT3_QUOTA_INIT_BLOCKS (DQUOT_MAX_WRITES*\
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(EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3)
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#else
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#define EXT3_QUOTA_TRANS_BLOCKS 0
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#define EXT3_QUOTA_INIT_BLOCKS 0
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#endif
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int
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ext3_mark_iloc_dirty(handle_t *handle,
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struct inode *inode,
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struct ext3_iloc *iloc);
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/*
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* On success, We end up with an outstanding reference count against
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* iloc->bh. This _must_ be cleaned up later.
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*/
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int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
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struct ext3_iloc *iloc);
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int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
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/*
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* Wrapper functions with which ext3 calls into JBD. The intent here is
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* to allow these to be turned into appropriate stubs so ext3 can control
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* ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't
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* been done yet.
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*/
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void ext3_journal_abort_handle(const char *caller, const char *err_fn,
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struct buffer_head *bh, handle_t *handle, int err);
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static inline int
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__ext3_journal_get_undo_access(const char *where, handle_t *handle,
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struct buffer_head *bh)
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{
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int err = journal_get_undo_access(handle, bh);
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if (err)
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ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
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return err;
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}
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static inline int
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__ext3_journal_get_write_access(const char *where, handle_t *handle,
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struct buffer_head *bh)
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{
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int err = journal_get_write_access(handle, bh);
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if (err)
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ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
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return err;
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}
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static inline void
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ext3_journal_release_buffer(handle_t *handle, struct buffer_head *bh)
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{
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journal_release_buffer(handle, bh);
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}
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static inline int
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__ext3_journal_forget(const char *where, handle_t *handle, struct buffer_head *bh)
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{
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int err = journal_forget(handle, bh);
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if (err)
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ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
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return err;
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}
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static inline int
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__ext3_journal_revoke(const char *where, handle_t *handle,
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unsigned long blocknr, struct buffer_head *bh)
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{
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int err = journal_revoke(handle, blocknr, bh);
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if (err)
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ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
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return err;
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}
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static inline int
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__ext3_journal_get_create_access(const char *where,
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handle_t *handle, struct buffer_head *bh)
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{
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int err = journal_get_create_access(handle, bh);
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if (err)
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ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
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return err;
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}
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static inline int
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__ext3_journal_dirty_metadata(const char *where,
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handle_t *handle, struct buffer_head *bh)
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{
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int err = journal_dirty_metadata(handle, bh);
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if (err)
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ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
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return err;
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}
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#define ext3_journal_get_undo_access(handle, bh) \
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__ext3_journal_get_undo_access(__FUNCTION__, (handle), (bh))
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#define ext3_journal_get_write_access(handle, bh) \
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__ext3_journal_get_write_access(__FUNCTION__, (handle), (bh))
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#define ext3_journal_revoke(handle, blocknr, bh) \
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__ext3_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
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#define ext3_journal_get_create_access(handle, bh) \
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__ext3_journal_get_create_access(__FUNCTION__, (handle), (bh))
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#define ext3_journal_dirty_metadata(handle, bh) \
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__ext3_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
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#define ext3_journal_forget(handle, bh) \
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__ext3_journal_forget(__FUNCTION__, (handle), (bh))
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int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
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handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
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int __ext3_journal_stop(const char *where, handle_t *handle);
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static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
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{
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return ext3_journal_start_sb(inode->i_sb, nblocks);
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}
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#define ext3_journal_stop(handle) \
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__ext3_journal_stop(__FUNCTION__, (handle))
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static inline handle_t *ext3_journal_current_handle(void)
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{
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return journal_current_handle();
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}
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static inline int ext3_journal_extend(handle_t *handle, int nblocks)
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{
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return journal_extend(handle, nblocks);
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}
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static inline int ext3_journal_restart(handle_t *handle, int nblocks)
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{
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return journal_restart(handle, nblocks);
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}
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static inline int ext3_journal_blocks_per_page(struct inode *inode)
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{
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return journal_blocks_per_page(inode);
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}
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static inline int ext3_journal_force_commit(journal_t *journal)
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{
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return journal_force_commit(journal);
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}
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/* super.c */
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int ext3_force_commit(struct super_block *sb);
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static inline int ext3_should_journal_data(struct inode *inode)
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{
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if (!S_ISREG(inode->i_mode))
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return 1;
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if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
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return 1;
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if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
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return 1;
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return 0;
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}
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static inline int ext3_should_order_data(struct inode *inode)
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{
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if (!S_ISREG(inode->i_mode))
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return 0;
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if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
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return 0;
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if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
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return 1;
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return 0;
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}
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static inline int ext3_should_writeback_data(struct inode *inode)
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{
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if (!S_ISREG(inode->i_mode))
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return 0;
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if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
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return 0;
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if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
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return 1;
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return 0;
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}
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#endif /* _LINUX_EXT3_JBD_H */
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