[deliverable/linux.git] / fs / ext4 / ext4_jbd2.h

/*
 * ext4_jbd2.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 _EXT4_JBD2_H
#define _EXT4_JBD2_H

#include <linux/fs.h>
#include <linux/jbd2.h>
#include "ext4.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.
 *
 * For extents-enabled fs we may have to allocate and modify up to
 * 5 levels of tree + root which are stored in the inode. */

#define EXT4_SINGLEDATA_TRANS_BLOCKS(sb)				\
	(EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)   \
	 ? 27U : 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(sb) + \
					 EXT4_XATTR_TRANS_BLOCKS - 2 + \
					 EXT4_MAXQUOTAS_TRANS_BLOCKS(sb))

/*
 * Define the number of metadata blocks we need to account to modify data.
 *
 * This include super block, inode block, quota blocks and xattr blocks
 */
#define EXT4_META_TRANS_BLOCKS(sb)	(EXT4_XATTR_TRANS_BLOCKS + \
					EXT4_MAXQUOTAS_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(sb)-3)+3+DQUOT_INIT_REWRITE) : 0)

#define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
		(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-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
#define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb))
#define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb))
#define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))

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.
 */
void ext4_journal_abort_handle(const char *caller, unsigned int line,
			       const char *err_fn,
		struct buffer_head *bh, handle_t *handle, int err);

int __ext4_journal_get_undo_access(const char *where, unsigned int line,
				   handle_t *handle, struct buffer_head *bh);

int __ext4_journal_get_write_access(const char *where, unsigned int line,
				    handle_t *handle, struct buffer_head *bh);

int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
		  int is_metadata, struct inode *inode,
		  struct buffer_head *bh, ext4_fsblk_t blocknr);

int __ext4_journal_get_create_access(const char *where, unsigned int line,
				handle_t *handle, struct buffer_head *bh);

int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
				 handle_t *handle, struct inode *inode,
				 struct buffer_head *bh);

int __ext4_handle_dirty_super(const char *where, unsigned int line,
			      handle_t *handle, struct super_block *sb);

#define ext4_journal_get_undo_access(handle, bh) \
	__ext4_journal_get_undo_access(__func__, __LINE__, (handle), (bh))
#define ext4_journal_get_write_access(handle, bh) \
	__ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh))
#define ext4_forget(handle, is_metadata, inode, bh, block_nr) \
	__ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \
		      (bh), (block_nr))
#define ext4_journal_get_create_access(handle, bh) \
	__ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh))
#define ext4_handle_dirty_metadata(handle, inode, bh) \
	__ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \
				     (bh))
#define ext4_handle_dirty_super(handle, sb) \
	__ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb))

handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle);

#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)

/* Note:  Do not use this for NULL handles.  This is only to determine if
 * a properly allocated handle is using a journal or not. */
static inline int ext4_handle_valid(handle_t *handle)
{
	if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
		return 0;
	return 1;
}

static inline void ext4_handle_sync(handle_t *handle)
{
	if (ext4_handle_valid(handle))
		handle->h_sync = 1;
}

static inline void ext4_handle_release_buffer(handle_t *handle,
						struct buffer_head *bh)
{
	if (ext4_handle_valid(handle))
		jbd2_journal_release_buffer(handle, bh);
}

static inline int ext4_handle_is_aborted(handle_t *handle)
{
	if (ext4_handle_valid(handle))
		return is_handle_aborted(handle);
	return 0;
}

static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed)
{
	if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed)
		return 0;
	return 1;
}

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(__func__, __LINE__, (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)
{
	if (ext4_handle_valid(handle))
		return jbd2_journal_extend(handle, nblocks);
	return 0;
}

static inline int ext4_journal_restart(handle_t *handle, int nblocks)
{
	if (ext4_handle_valid(handle))
		return jbd2_journal_restart(handle, nblocks);
	return 0;
}

static inline int ext4_journal_blocks_per_page(struct inode *inode)
{
	if (EXT4_JOURNAL(inode) != NULL)
		return jbd2_journal_blocks_per_page(inode);
	return 0;
}

static inline int ext4_journal_force_commit(journal_t *journal)
{
	if (journal)
		return jbd2_journal_force_commit(journal);
	return 0;
}

static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode)
{
	if (ext4_handle_valid(handle))
		return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode);
	return 0;
}

static inline void ext4_update_inode_fsync_trans(handle_t *handle,
						 struct inode *inode,
						 int datasync)
{
	struct ext4_inode_info *ei = EXT4_I(inode);

	if (ext4_handle_valid(handle)) {
		ei->i_sync_tid = handle->h_transaction->t_tid;
		if (datasync)
			ei->i_datasync_tid = handle->h_transaction->t_tid;
	}
}

/* super.c */
int ext4_force_commit(struct super_block *sb);

static inline int ext4_should_journal_data(struct inode *inode)
{
	if (EXT4_JOURNAL(inode) == NULL)
		return 0;
	if (!S_ISREG(inode->i_mode))
		return 1;
	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
		return 1;
	if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA))
		return 1;
	return 0;
}

static inline int ext4_should_order_data(struct inode *inode)
{
	if (EXT4_JOURNAL(inode) == NULL)
		return 0;
	if (!S_ISREG(inode->i_mode))
		return 0;
	if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA))
		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_JOURNAL(inode) == NULL)
		return 1;
	if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA))
		return 0;
	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
		return 1;
	return 0;
}

/*
 * This function controls whether or not we should try to go down the
 * dioread_nolock code paths, which makes it safe to avoid taking
 * i_mutex for direct I/O reads.  This only works for extent-based
 * files, and it doesn't work if data journaling is enabled, since the
 * dioread_nolock code uses b_private to pass information back to the
 * I/O completion handler, and this conflicts with the jbd's use of
 * b_private.
 */
static inline int ext4_should_dioread_nolock(struct inode *inode)
{
	if (!test_opt(inode->i_sb, DIOREAD_NOLOCK))
		return 0;
	if (!S_ISREG(inode->i_mode))
		return 0;
	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		return 0;
	if (ext4_should_journal_data(inode))
		return 0;
	return 1;
}

#endif	/* _EXT4_JBD2_H */
Commit	Line	Data
470decc6	1	/*
3dcf5451	2	* ext4_jbd2.h
470decc6 DK	3	*
	4	* Written by Stephen C. Tweedie <sct@redhat.com>, 1999
	5	*
	6	* Copyright 1998--1999 Red Hat corp --- All Rights Reserved
	7	*
	8	* This file is part of the Linux kernel and is made available under
	9	* the terms of the GNU General Public License, version 2, or at your
	10	* option, any later version, incorporated herein by reference.
	11	*
	12	* Ext4-specific journaling extensions.
	13	*/
	14
3dcf5451 CH	15	#ifndef _EXT4_JBD2_H
3dcf5451 CH	16	#define _EXT4_JBD2_H
470decc6 DK	17
470decc6 DK	18	#include <linux/fs.h>
f7f4bccb	19	#include <linux/jbd2.h>
3dcf5451	20	#include "ext4.h"
470decc6 DK	21
	22	#define EXT4_JOURNAL(inode) (EXT4_SB((inode)->i_sb)->s_journal)
	23
	24	/* Define the number of blocks we need to account to a transaction to
	25	* modify one block of data.
	26	*
	27	* We may have to touch one inode, one bitmap buffer, up to three
	28	* indirection blocks, the group and superblock summaries, and the data
a86c6181 AT	29	* block to complete the transaction.
a86c6181 AT	30	*
d0d856e8 RD	31	* For extents-enabled fs we may have to allocate and modify up to
d0d856e8 RD	32	* 5 levels of tree + root which are stored in the inode. */
470decc6	33
a86c6181	34	#define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \
83982b6f TT	35	(EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \
83982b6f TT	36	? 27U : 8U)
470decc6 DK	37
	38	/* Extended attribute operations touch at most two data buffers,
	39	* two bitmap buffers, and two group summaries, in addition to the inode
	40	* and the superblock, which are already accounted for. */
	41
	42	#define EXT4_XATTR_TRANS_BLOCKS 6U
	43
	44	/* Define the minimum size for a transaction which modifies data. This
	45	* needs to take into account the fact that we may end up modifying two
	46	* quota files too (one for the group, one for the user quota). The
	47	* superblock only gets updated once, of course, so don't bother
	48	* counting that again for the quota updates. */
	49
a86c6181	50	#define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \
470decc6	51	EXT4_XATTR_TRANS_BLOCKS - 2 + \
5aca07eb	52	EXT4_MAXQUOTAS_TRANS_BLOCKS(sb))
470decc6	53
a02908f1 MC	54	/*
	55	* Define the number of metadata blocks we need to account to modify data.
	56	*
	57	* This include super block, inode block, quota blocks and xattr blocks
	58	*/
	59	#define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \
5aca07eb	60	EXT4_MAXQUOTAS_TRANS_BLOCKS(sb))
a02908f1	61
470decc6 DK	62	/* Delete operations potentially hit one directory's namespace plus an
	63	* entire inode, plus arbitrary amounts of bitmap/indirection data. Be
	64	* generous. We can grow the delete transaction later if necessary. */
	65
	66	#define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64)
	67
	68	/* Define an arbitrary limit for the amount of data we will anticipate
	69	* writing to any given transaction. For unbounded transactions such as
	70	* write(2) and truncate(2) we can write more than this, but we always
	71	* start off at the maximum transaction size and grow the transaction
	72	* optimistically as we go. */
	73
	74	#define EXT4_MAX_TRANS_DATA 64U
	75
	76	/* We break up a large truncate or write transaction once the handle's
	77	* buffer credits gets this low, we need either to extend the
	78	* transaction or to start a new one. Reserve enough space here for
	79	* inode, bitmap, superblock, group and indirection updates for at least
	80	* one block, plus two quota updates. Quota allocations are not
	81	* needed. */
	82
	83	#define EXT4_RESERVE_TRANS_BLOCKS 12U
	84
	85	#define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8
	86
	87	#ifdef CONFIG_QUOTA
	88	/* Amount of blocks needed for quota update - we know that the structure was
	89	* allocated so we need to update only inode+data */
	90	#define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
	91	/* Amount of blocks needed for quota insert/delete - we do some block writes
	92	* but inode, sb and group updates are done only once */
	93	#define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
a86c6181	94	(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0)
5aca07eb	95
470decc6	96	#define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
a86c6181	97	(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0)
470decc6 DK	98	#else
	99	#define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
	100	#define EXT4_QUOTA_INIT_BLOCKS(sb) 0
	101	#define EXT4_QUOTA_DEL_BLOCKS(sb) 0
	102	#endif
5aca07eb DM	103	#define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb))
	104	#define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb))
	105	#define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))
470decc6 DK	106
	107	int
	108	ext4_mark_iloc_dirty(handle_t *handle,
	109	struct inode *inode,
	110	struct ext4_iloc *iloc);
	111
	112	/*
	113	* On success, We end up with an outstanding reference count against
	114	* iloc->bh. This _must_ be cleaned up later.
	115	*/
	116
	117	int ext4_reserve_inode_write(handle_t handle, struct inode inode,
	118	struct ext4_iloc *iloc);
	119
	120	int ext4_mark_inode_dirty(handle_t handle, struct inode inode);
	121
	122	/*
e4684b3f	123	* Wrapper functions with which ext4 calls into JBD.
470decc6	124	*/
90c7201b TT	125	void ext4_journal_abort_handle(const char *caller, unsigned int line,
90c7201b TT	126	const char *err_fn,
8984d137	127	struct buffer_head bh, handle_t handle, int err);
470decc6	128
90c7201b TT	129	int __ext4_journal_get_undo_access(const char *where, unsigned int line,
90c7201b TT	130	handle_t handle, struct buffer_head bh);
470decc6	131
90c7201b TT	132	int __ext4_journal_get_write_access(const char *where, unsigned int line,
90c7201b TT	133	handle_t handle, struct buffer_head bh);
470decc6	134
90c7201b TT	135	int __ext4_forget(const char where, unsigned int line, handle_t handle,
	136	int is_metadata, struct inode *inode,
	137	struct buffer_head *bh, ext4_fsblk_t blocknr);
d6797d14	138
90c7201b	139	int __ext4_journal_get_create_access(const char *where, unsigned int line,
8984d137	140	handle_t handle, struct buffer_head bh);
470decc6	141
90c7201b TT	142	int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
	143	handle_t handle, struct inode inode,
	144	struct buffer_head *bh);
470decc6	145
90c7201b TT	146	int __ext4_handle_dirty_super(const char *where, unsigned int line,
90c7201b TT	147	handle_t handle, struct super_block sb);
a0375156	148
470decc6	149	#define ext4_journal_get_undo_access(handle, bh) \
90c7201b	150	__ext4_journal_get_undo_access(__func__, __LINE__, (handle), (bh))
470decc6	151	#define ext4_journal_get_write_access(handle, bh) \
90c7201b	152	__ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh))
d6797d14	153	#define ext4_forget(handle, is_metadata, inode, bh, block_nr) \
90c7201b TT	154	__ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \
90c7201b TT	155	(bh), (block_nr))
470decc6	156	#define ext4_journal_get_create_access(handle, bh) \
90c7201b	157	__ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh))
0390131b	158	#define ext4_handle_dirty_metadata(handle, inode, bh) \
90c7201b TT	159	__ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \
90c7201b TT	160	(bh))
a0375156	161	#define ext4_handle_dirty_super(handle, sb) \
90c7201b	162	__ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb))
470decc6	163
470decc6	164	handle_t ext4_journal_start_sb(struct super_block sb, int nblocks);
c398eda0	165	int __ext4_journal_stop(const char where, unsigned int line, handle_t handle);
470decc6	166
d3d1faf6	167	#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
0390131b	168
d3d1faf6 CW	169	/* Note: Do not use this for NULL handles. This is only to determine if
d3d1faf6 CW	170	* a properly allocated handle is using a journal or not. */
0390131b FM	171	static inline int ext4_handle_valid(handle_t *handle)
0390131b FM	172	{
d3d1faf6	173	if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
0390131b FM	174	return 0;
	175	return 1;
	176	}
	177
	178	static inline void ext4_handle_sync(handle_t *handle)
	179	{
	180	if (ext4_handle_valid(handle))
	181	handle->h_sync = 1;
	182	}
	183
	184	static inline void ext4_handle_release_buffer(handle_t *handle,
	185	struct buffer_head *bh)
	186	{
	187	if (ext4_handle_valid(handle))
	188	jbd2_journal_release_buffer(handle, bh);
	189	}
	190
	191	static inline int ext4_handle_is_aborted(handle_t *handle)
	192	{
	193	if (ext4_handle_valid(handle))
	194	return is_handle_aborted(handle);
	195	return 0;
	196	}
	197
	198	static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed)
	199	{
	200	if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed)
	201	return 0;
	202	return 1;
	203	}
	204
470decc6 DK	205	static inline handle_t ext4_journal_start(struct inode inode, int nblocks)
	206	{
	207	return ext4_journal_start_sb(inode->i_sb, nblocks);
	208	}
	209
	210	#define ext4_journal_stop(handle) \
c398eda0	211	__ext4_journal_stop(__func__, __LINE__, (handle))
470decc6 DK	212
	213	static inline handle_t *ext4_journal_current_handle(void)
	214	{
	215	return journal_current_handle();
	216	}
	217
	218	static inline int ext4_journal_extend(handle_t *handle, int nblocks)
	219	{
0390131b FM	220	if (ext4_handle_valid(handle))
	221	return jbd2_journal_extend(handle, nblocks);
	222	return 0;
470decc6 DK	223	}
	224
	225	static inline int ext4_journal_restart(handle_t *handle, int nblocks)
	226	{
0390131b FM	227	if (ext4_handle_valid(handle))
	228	return jbd2_journal_restart(handle, nblocks);
	229	return 0;
470decc6 DK	230	}
	231
	232	static inline int ext4_journal_blocks_per_page(struct inode *inode)
	233	{
0390131b FM	234	if (EXT4_JOURNAL(inode) != NULL)
	235	return jbd2_journal_blocks_per_page(inode);
	236	return 0;
470decc6 DK	237	}
	238
	239	static inline int ext4_journal_force_commit(journal_t *journal)
	240	{
0390131b FM	241	if (journal)
	242	return jbd2_journal_force_commit(journal);
	243	return 0;
470decc6 DK	244	}
470decc6 DK	245
678aaf48 JK	246	static inline int ext4_jbd2_file_inode(handle_t handle, struct inode inode)
678aaf48 JK	247	{
0390131b	248	if (ext4_handle_valid(handle))
8aefcd55	249	return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode);
0390131b	250	return 0;
678aaf48 JK	251	}
678aaf48 JK	252
b436b9be JK	253	static inline void ext4_update_inode_fsync_trans(handle_t *handle,
	254	struct inode *inode,
	255	int datasync)
	256	{
	257	struct ext4_inode_info *ei = EXT4_I(inode);
	258
	259	if (ext4_handle_valid(handle)) {
	260	ei->i_sync_tid = handle->h_transaction->t_tid;
	261	if (datasync)
	262	ei->i_datasync_tid = handle->h_transaction->t_tid;
	263	}
	264	}
	265
470decc6 DK	266	/* super.c */
	267	int ext4_force_commit(struct super_block *sb);
	268
	269	static inline int ext4_should_journal_data(struct inode *inode)
	270	{
0390131b FM	271	if (EXT4_JOURNAL(inode) == NULL)
0390131b FM	272	return 0;
470decc6 DK	273	if (!S_ISREG(inode->i_mode))
	274	return 1;
	275	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
	276	return 1;
12e9b892	277	if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA))
470decc6 DK	278	return 1;
	279	return 0;
	280	}
	281
	282	static inline int ext4_should_order_data(struct inode *inode)
	283	{
0390131b FM	284	if (EXT4_JOURNAL(inode) == NULL)
0390131b FM	285	return 0;
470decc6 DK	286	if (!S_ISREG(inode->i_mode))
470decc6 DK	287	return 0;
12e9b892	288	if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA))
470decc6 DK	289	return 0;
	290	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
	291	return 1;
	292	return 0;
	293	}
	294
	295	static inline int ext4_should_writeback_data(struct inode *inode)
	296	{
	297	if (!S_ISREG(inode->i_mode))
	298	return 0;
5adfee9c TT	299	if (EXT4_JOURNAL(inode) == NULL)
5adfee9c TT	300	return 1;
12e9b892	301	if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA))
470decc6 DK	302	return 0;
	303	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
	304	return 1;
	305	return 0;
	306	}
	307
744692dc JZ	308	/*
	309	* This function controls whether or not we should try to go down the
	310	* dioread_nolock code paths, which makes it safe to avoid taking
	311	* i_mutex for direct I/O reads. This only works for extent-based
206f7ab4 CH	312	* files, and it doesn't work if data journaling is enabled, since the
	313	* dioread_nolock code uses b_private to pass information back to the
	314	* I/O completion handler, and this conflicts with the jbd's use of
	315	* b_private.
744692dc JZ	316	*/
	317	static inline int ext4_should_dioread_nolock(struct inode *inode)
	318	{
	319	if (!test_opt(inode->i_sb, DIOREAD_NOLOCK))
	320	return 0;
744692dc JZ	321	if (!S_ISREG(inode->i_mode))
744692dc JZ	322	return 0;
12e9b892	323	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
744692dc JZ	324	return 0;
	325	if (ext4_should_journal_data(inode))
	326	return 0;
	327	return 1;
	328	}
	329
3dcf5451	330	#endif /* _EXT4_JBD2_H */