[linux-block.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 + \
					 2*EXT4_QUOTA_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 + \
					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(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

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);

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

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

/* When called with an invalid handle, this will still do a put on the BH */
int __ext4_journal_forget(const char *where, handle_t *handle,
				struct buffer_head *bh);

/* When called with an invalid handle, this will still do a put on the BH */
int __ext4_journal_revoke(const char *where, handle_t *handle,
				ext4_fsblk_t blocknr, struct buffer_head *bh);

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

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

#define ext4_journal_get_undo_access(handle, bh) \
	__ext4_journal_get_undo_access(__func__, (handle), (bh))
#define ext4_journal_get_write_access(handle, bh) \
	__ext4_journal_get_write_access(__func__, (handle), (bh))
#define ext4_journal_revoke(handle, blocknr, bh) \
	__ext4_journal_revoke(__func__, (handle), (blocknr), (bh))
#define ext4_journal_get_create_access(handle, bh) \
	__ext4_journal_get_create_access(__func__, (handle), (bh))
#define ext4_journal_forget(handle, bh) \
	__ext4_journal_forget(__func__, (handle), (bh))
#define ext4_handle_dirty_metadata(handle, inode, bh) \
	__ext4_handle_dirty_metadata(__func__, (handle), (inode), (bh))

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

#define EXT4_NOJOURNAL_HANDLE	((handle_t *) 0x1)

static inline int ext4_handle_valid(handle_t *handle)
{
	if (handle == EXT4_NOJOURNAL_HANDLE)
		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 void ext4_journal_release_buffer(handle_t *handle,
						struct buffer_head *bh)
{
	if (ext4_handle_valid(handle))
		jbd2_journal_release_buffer(handle, bh);
}

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__, (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;
}

/* 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_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
		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_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_JOURNAL(inode) == NULL)
		return 1;
	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	/* _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 DK	51	EXT4_XATTR_TRANS_BLOCKS - 2 + \
	52	2*EXT4_QUOTA_TRANS_BLOCKS(sb))
	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 + \
	60	2*EXT4_QUOTA_TRANS_BLOCKS(sb))
	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)
470decc6	95	#define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
a86c6181	96	(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0)
470decc6 DK	97	#else
	98	#define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
	99	#define EXT4_QUOTA_INIT_BLOCKS(sb) 0
	100	#define EXT4_QUOTA_DEL_BLOCKS(sb) 0
	101	#endif
	102
	103	int
	104	ext4_mark_iloc_dirty(handle_t *handle,
	105	struct inode *inode,
	106	struct ext4_iloc *iloc);
	107
	108	/*
	109	* On success, We end up with an outstanding reference count against
	110	* iloc->bh. This _must_ be cleaned up later.
	111	*/
	112
	113	int ext4_reserve_inode_write(handle_t handle, struct inode inode,
	114	struct ext4_iloc *iloc);
	115
	116	int ext4_mark_inode_dirty(handle_t handle, struct inode inode);
	117
	118	/*
	119	* Wrapper functions with which ext4 calls into JBD. The intent here is
	120	* to allow these to be turned into appropriate stubs so ext4 can control
	121	* ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't
	122	* been done yet.
	123	*/
	124
8984d137 AM	125	void ext4_journal_abort_handle(const char caller, const char err_fn,
8984d137 AM	126	struct buffer_head bh, handle_t handle, int err);
470decc6	127
8984d137 AM	128	int __ext4_journal_get_undo_access(const char where, handle_t handle,
8984d137 AM	129	struct buffer_head *bh);
470decc6	130
8984d137 AM	131	int __ext4_journal_get_write_access(const char where, handle_t handle,
8984d137 AM	132	struct buffer_head *bh);
470decc6	133
e6b5d301	134	/* When called with an invalid handle, this will still do a put on the BH */
8984d137 AM	135	int __ext4_journal_forget(const char where, handle_t handle,
8984d137 AM	136	struct buffer_head *bh);
470decc6	137
e6b5d301	138	/* When called with an invalid handle, this will still do a put on the BH */
8984d137 AM	139	int __ext4_journal_revoke(const char where, handle_t handle,
8984d137 AM	140	ext4_fsblk_t blocknr, struct buffer_head *bh);
470decc6	141
8984d137 AM	142	int __ext4_journal_get_create_access(const char *where,
8984d137 AM	143	handle_t handle, struct buffer_head bh);
470decc6	144
0390131b FM	145	int __ext4_handle_dirty_metadata(const char where, handle_t handle,
0390131b FM	146	struct inode inode, struct buffer_head bh);
470decc6 DK	147
470decc6 DK	148	#define ext4_journal_get_undo_access(handle, bh) \
4db9c54a	149	__ext4_journal_get_undo_access(__func__, (handle), (bh))
470decc6	150	#define ext4_journal_get_write_access(handle, bh) \
4db9c54a	151	__ext4_journal_get_write_access(__func__, (handle), (bh))
470decc6	152	#define ext4_journal_revoke(handle, blocknr, bh) \
4db9c54a	153	__ext4_journal_revoke(__func__, (handle), (blocknr), (bh))
470decc6	154	#define ext4_journal_get_create_access(handle, bh) \
4db9c54a	155	__ext4_journal_get_create_access(__func__, (handle), (bh))
470decc6	156	#define ext4_journal_forget(handle, bh) \
4db9c54a	157	__ext4_journal_forget(__func__, (handle), (bh))
0390131b FM	158	#define ext4_handle_dirty_metadata(handle, inode, bh) \
0390131b FM	159	__ext4_handle_dirty_metadata(__func__, (handle), (inode), (bh))
470decc6	160
470decc6 DK	161	handle_t ext4_journal_start_sb(struct super_block sb, int nblocks);
	162	int __ext4_journal_stop(const char where, handle_t handle);
	163
0390131b FM	164	#define EXT4_NOJOURNAL_HANDLE ((handle_t *) 0x1)
	165
	166	static inline int ext4_handle_valid(handle_t *handle)
	167	{
	168	if (handle == EXT4_NOJOURNAL_HANDLE)
	169	return 0;
	170	return 1;
	171	}
	172
	173	static inline void ext4_handle_sync(handle_t *handle)
	174	{
	175	if (ext4_handle_valid(handle))
	176	handle->h_sync = 1;
	177	}
	178
	179	static inline void ext4_handle_release_buffer(handle_t *handle,
	180	struct buffer_head *bh)
	181	{
	182	if (ext4_handle_valid(handle))
	183	jbd2_journal_release_buffer(handle, bh);
	184	}
	185
	186	static inline int ext4_handle_is_aborted(handle_t *handle)
	187	{
	188	if (ext4_handle_valid(handle))
	189	return is_handle_aborted(handle);
	190	return 0;
	191	}
	192
	193	static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed)
	194	{
	195	if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed)
	196	return 0;
	197	return 1;
	198	}
	199
	200	static inline void ext4_journal_release_buffer(handle_t *handle,
	201	struct buffer_head *bh)
	202	{
	203	if (ext4_handle_valid(handle))
	204	jbd2_journal_release_buffer(handle, bh);
	205	}
	206
470decc6 DK	207	static inline handle_t ext4_journal_start(struct inode inode, int nblocks)
	208	{
	209	return ext4_journal_start_sb(inode->i_sb, nblocks);
	210	}
	211
	212	#define ext4_journal_stop(handle) \
4db9c54a	213	__ext4_journal_stop(__func__, (handle))
470decc6 DK	214
	215	static inline handle_t *ext4_journal_current_handle(void)
	216	{
	217	return journal_current_handle();
	218	}
	219
	220	static inline int ext4_journal_extend(handle_t *handle, int nblocks)
	221	{
0390131b FM	222	if (ext4_handle_valid(handle))
	223	return jbd2_journal_extend(handle, nblocks);
	224	return 0;
470decc6 DK	225	}
	226
	227	static inline int ext4_journal_restart(handle_t *handle, int nblocks)
	228	{
0390131b FM	229	if (ext4_handle_valid(handle))
	230	return jbd2_journal_restart(handle, nblocks);
	231	return 0;
470decc6 DK	232	}
	233
	234	static inline int ext4_journal_blocks_per_page(struct inode *inode)
	235	{
0390131b FM	236	if (EXT4_JOURNAL(inode) != NULL)
	237	return jbd2_journal_blocks_per_page(inode);
	238	return 0;
470decc6 DK	239	}
	240
	241	static inline int ext4_journal_force_commit(journal_t *journal)
	242	{
0390131b FM	243	if (journal)
	244	return jbd2_journal_force_commit(journal);
	245	return 0;
470decc6 DK	246	}
470decc6 DK	247
678aaf48 JK	248	static inline int ext4_jbd2_file_inode(handle_t handle, struct inode inode)
678aaf48 JK	249	{
0390131b FM	250	if (ext4_handle_valid(handle))
	251	return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode);
	252	return 0;
678aaf48 JK	253	}
678aaf48 JK	254
470decc6 DK	255	/* super.c */
	256	int ext4_force_commit(struct super_block *sb);
	257
	258	static inline int ext4_should_journal_data(struct inode *inode)
	259	{
0390131b FM	260	if (EXT4_JOURNAL(inode) == NULL)
0390131b FM	261	return 0;
470decc6 DK	262	if (!S_ISREG(inode->i_mode))
	263	return 1;
	264	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
	265	return 1;
	266	if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
	267	return 1;
	268	return 0;
	269	}
	270
	271	static inline int ext4_should_order_data(struct inode *inode)
	272	{
0390131b FM	273	if (EXT4_JOURNAL(inode) == NULL)
0390131b FM	274	return 0;
470decc6 DK	275	if (!S_ISREG(inode->i_mode))
	276	return 0;
	277	if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
	278	return 0;
	279	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
	280	return 1;
	281	return 0;
	282	}
	283
	284	static inline int ext4_should_writeback_data(struct inode *inode)
	285	{
	286	if (!S_ISREG(inode->i_mode))
	287	return 0;
5adfee9c TT	288	if (EXT4_JOURNAL(inode) == NULL)
5adfee9c TT	289	return 1;
470decc6 DK	290	if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
	291	return 0;
	292	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
	293	return 1;
	294	return 0;
	295	}
	296
3dcf5451	297	#endif /* _EXT4_JBD2_H */