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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [ext3_jbd.h] - Blame information for rev 62

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1 62 marcus.erl
/*
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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(sb)      (EXT3_SINGLEDATA_TRANS_BLOCKS + \
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                                         EXT3_XATTR_TRANS_BLOCKS - 2 + \
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                                         2*EXT3_QUOTA_TRANS_BLOCKS(sb))
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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(sb)    (2 * EXT3_DATA_TRANS_BLOCKS(sb) + 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(sb) (test_opt(sb, QUOTA) ? 2 : 0)
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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(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
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                (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
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#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
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                (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
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#else
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#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
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#define EXT3_QUOTA_INIT_BLOCKS(sb) 0
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#define EXT3_QUOTA_DEL_BLOCKS(sb) 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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static inline void ext3_journal_release_buffer(handle_t *handle,
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                                                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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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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int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
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                                struct buffer_head *bh);
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int __ext3_journal_get_write_access(const char *where, handle_t *handle,
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                                struct buffer_head *bh);
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int __ext3_journal_forget(const char *where, handle_t *handle,
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                                struct buffer_head *bh);
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int __ext3_journal_revoke(const char *where, handle_t *handle,
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                                unsigned long blocknr, struct buffer_head *bh);
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int __ext3_journal_get_create_access(const char *where,
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                                handle_t *handle, struct buffer_head *bh);
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int __ext3_journal_dirty_metadata(const char *where,
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                                handle_t *handle, struct buffer_head *bh);
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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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