331 lines
10 KiB
C
331 lines
10 KiB
C
/*
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* ext4_jbd2.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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* Ext4-specific journaling extensions.
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*/
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#ifndef _EXT4_JBD2_H
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#define _EXT4_JBD2_H
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#include <linux/fs.h>
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#include <linux/jbd2.h>
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#include "ext4.h"
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#define EXT4_JOURNAL(inode) (EXT4_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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*
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* For extents-enabled fs we may have to allocate and modify up to
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* 5 levels of tree + root which are stored in the inode. */
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#define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \
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(EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \
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? 27U : 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 EXT4_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 EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \
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EXT4_XATTR_TRANS_BLOCKS - 2 + \
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EXT4_MAXQUOTAS_TRANS_BLOCKS(sb))
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/*
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* Define the number of metadata blocks we need to account to modify data.
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*
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* This include super block, inode block, quota blocks and xattr blocks
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*/
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#define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \
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EXT4_MAXQUOTAS_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 EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_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 EXT4_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 EXT4_RESERVE_TRANS_BLOCKS 12U
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#define EXT4_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 data block */
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#define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 1 : 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 EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
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(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0)
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#define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
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(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0)
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#else
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#define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
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#define EXT4_QUOTA_INIT_BLOCKS(sb) 0
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#define EXT4_QUOTA_DEL_BLOCKS(sb) 0
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#endif
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#define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb))
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#define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb))
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#define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))
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int
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ext4_mark_iloc_dirty(handle_t *handle,
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struct inode *inode,
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struct ext4_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 ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
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struct ext4_iloc *iloc);
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int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
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/*
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* Wrapper functions with which ext4 calls into JBD.
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*/
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void ext4_journal_abort_handle(const char *caller, unsigned int line,
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const char *err_fn,
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struct buffer_head *bh, handle_t *handle, int err);
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int __ext4_journal_get_undo_access(const char *where, unsigned int line,
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handle_t *handle, struct buffer_head *bh);
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int __ext4_journal_get_write_access(const char *where, unsigned int line,
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handle_t *handle, struct buffer_head *bh);
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int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
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int is_metadata, struct inode *inode,
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struct buffer_head *bh, ext4_fsblk_t blocknr);
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int __ext4_journal_get_create_access(const char *where, unsigned int line,
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handle_t *handle, struct buffer_head *bh);
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int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
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handle_t *handle, struct inode *inode,
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struct buffer_head *bh);
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int __ext4_handle_dirty_super(const char *where, unsigned int line,
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handle_t *handle, struct super_block *sb);
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#define ext4_journal_get_undo_access(handle, bh) \
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__ext4_journal_get_undo_access(__func__, __LINE__, (handle), (bh))
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#define ext4_journal_get_write_access(handle, bh) \
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__ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh))
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#define ext4_forget(handle, is_metadata, inode, bh, block_nr) \
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__ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \
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(bh), (block_nr))
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#define ext4_journal_get_create_access(handle, bh) \
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__ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh))
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#define ext4_handle_dirty_metadata(handle, inode, bh) \
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__ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \
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(bh))
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#define ext4_handle_dirty_super(handle, sb) \
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__ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb))
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handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
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int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle);
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#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
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/* Note: Do not use this for NULL handles. This is only to determine if
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* a properly allocated handle is using a journal or not. */
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static inline int ext4_handle_valid(handle_t *handle)
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{
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if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
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return 0;
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return 1;
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}
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static inline void ext4_handle_sync(handle_t *handle)
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{
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if (ext4_handle_valid(handle))
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handle->h_sync = 1;
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}
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static inline void ext4_handle_release_buffer(handle_t *handle,
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struct buffer_head *bh)
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{
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if (ext4_handle_valid(handle))
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jbd2_journal_release_buffer(handle, bh);
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}
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static inline int ext4_handle_is_aborted(handle_t *handle)
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{
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if (ext4_handle_valid(handle))
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return is_handle_aborted(handle);
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return 0;
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}
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static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed)
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{
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if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed)
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return 0;
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return 1;
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}
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static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks)
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{
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return ext4_journal_start_sb(inode->i_sb, nblocks);
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}
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#define ext4_journal_stop(handle) \
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__ext4_journal_stop(__func__, __LINE__, (handle))
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static inline handle_t *ext4_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 ext4_journal_extend(handle_t *handle, int nblocks)
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{
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if (ext4_handle_valid(handle))
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return jbd2_journal_extend(handle, nblocks);
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return 0;
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}
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static inline int ext4_journal_restart(handle_t *handle, int nblocks)
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{
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if (ext4_handle_valid(handle))
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return jbd2_journal_restart(handle, nblocks);
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return 0;
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}
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static inline int ext4_journal_blocks_per_page(struct inode *inode)
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{
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if (EXT4_JOURNAL(inode) != NULL)
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return jbd2_journal_blocks_per_page(inode);
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return 0;
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}
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static inline int ext4_journal_force_commit(journal_t *journal)
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{
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if (journal)
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return jbd2_journal_force_commit(journal);
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return 0;
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}
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static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode)
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{
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if (ext4_handle_valid(handle))
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return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode);
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return 0;
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}
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static inline void ext4_update_inode_fsync_trans(handle_t *handle,
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struct inode *inode,
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int datasync)
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{
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struct ext4_inode_info *ei = EXT4_I(inode);
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if (ext4_handle_valid(handle)) {
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ei->i_sync_tid = handle->h_transaction->t_tid;
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if (datasync)
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ei->i_datasync_tid = handle->h_transaction->t_tid;
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}
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}
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/* super.c */
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int ext4_force_commit(struct super_block *sb);
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static inline int ext4_should_journal_data(struct inode *inode)
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{
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if (EXT4_JOURNAL(inode) == NULL)
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return 0;
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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) == EXT4_MOUNT_JOURNAL_DATA)
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return 1;
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if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA))
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return 1;
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return 0;
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}
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static inline int ext4_should_order_data(struct inode *inode)
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{
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if (EXT4_JOURNAL(inode) == NULL)
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return 0;
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if (!S_ISREG(inode->i_mode))
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return 0;
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if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA))
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return 0;
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if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_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 ext4_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 (EXT4_JOURNAL(inode) == NULL)
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return 1;
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if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA))
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return 0;
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if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
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return 1;
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return 0;
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}
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/*
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* This function controls whether or not we should try to go down the
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* dioread_nolock code paths, which makes it safe to avoid taking
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* i_mutex for direct I/O reads. This only works for extent-based
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* files, and it doesn't work if data journaling is enabled, since the
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* dioread_nolock code uses b_private to pass information back to the
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* I/O completion handler, and this conflicts with the jbd's use of
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* b_private.
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*/
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static inline int ext4_should_dioread_nolock(struct inode *inode)
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{
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if (!test_opt(inode->i_sb, DIOREAD_NOLOCK))
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return 0;
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if (!S_ISREG(inode->i_mode))
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return 0;
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if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
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return 0;
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if (ext4_should_journal_data(inode))
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return 0;
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return 1;
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}
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#endif /* _EXT4_JBD2_H */
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