[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 data block */
#define EXT4_QUOTA_TRANS_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
		EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\
		1 : 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) ||\
		EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_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) ||\
		EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_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))

/**
 *   struct ext4_journal_cb_entry - Base structure for callback information.
 *
 *   This struct is a 'seed' structure for a using with your own callback
 *   structs. If you are using callbacks you must allocate one of these
 *   or another struct of your own definition which has this struct
 *   as it's first element and pass it to ext4_journal_callback_add().
 */
struct ext4_journal_cb_entry {
	/* list information for other callbacks attached to the same handle */
	struct list_head jce_list;

	/*  Function to call with this callback structure */
	void (*jce_func)(struct super_block *sb,
			 struct ext4_journal_cb_entry *jce, int error);

	/* user data goes here */
};

/**
 * ext4_journal_callback_add: add a function to call after transaction commit
 * @handle: active journal transaction handle to register callback on
 * @func: callback function to call after the transaction has committed:
 *        @sb: superblock of current filesystem for transaction
 *        @jce: returned journal callback data
 *        @rc: journal state at commit (0 = transaction committed properly)
 * @jce: journal callback data (internal and function private data struct)
 *
 * The registered function will be called in the context of the journal thread
 * after the transaction for which the handle was created has completed.
 *
 * No locks are held when the callback function is called, so it is safe to
 * call blocking functions from within the callback, but the callback should
 * not block or run for too long, or the filesystem will be blocked waiting for
 * the next transaction to commit. No journaling functions can be used, or
 * there is a risk of deadlock.
 *
 * There is no guaranteed calling order of multiple registered callbacks on
 * the same transaction.
 */
static inline void ext4_journal_callback_add(handle_t *handle,
			void (*func)(struct super_block *sb,
				     struct ext4_journal_cb_entry *jce,
				     int rc),
			struct ext4_journal_cb_entry *jce)
{
	struct ext4_sb_info *sbi =
			EXT4_SB(handle->h_transaction->t_journal->j_private);

	/* Add the jce to transaction's private list */
	jce->jce_func = func;
	spin_lock(&sbi->s_md_lock);
	list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list);
	spin_unlock(&sbi->s_md_lock);
}

/**
 * ext4_journal_callback_del: delete a registered callback
 * @handle: active journal transaction handle on which callback was registered
 * @jce: registered journal callback entry to unregister
 */
static inline void ext4_journal_callback_del(handle_t *handle,
					     struct ext4_journal_cb_entry *jce)
{
	struct ext4_sb_info *sbi =
			EXT4_SB(handle->h_transaction->t_journal->j_private);

	spin_lock(&sbi->s_md_lock);
	list_del_init(&jce->jce_list);
	spin_unlock(&sbi->s_md_lock);
}

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_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_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);

/*
 * Ext4 inode journal modes
 */
#define EXT4_INODE_JOURNAL_DATA_MODE	0x01 /* journal data mode */
#define EXT4_INODE_ORDERED_DATA_MODE	0x02 /* ordered data mode */
#define EXT4_INODE_WRITEBACK_DATA_MODE	0x04 /* writeback data mode */

static inline int ext4_inode_journal_mode(struct inode *inode)
{
	if (EXT4_JOURNAL(inode) == NULL)
		return EXT4_INODE_WRITEBACK_DATA_MODE;	/* writeback */
	/* We do not support data journalling with delayed allocation */
	if (!S_ISREG(inode->i_mode) ||
	    test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
		return EXT4_INODE_JOURNAL_DATA_MODE;	/* journal data */
	if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
	    !test_opt(inode->i_sb, DELALLOC))
		return EXT4_INODE_JOURNAL_DATA_MODE;	/* journal data */
	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
		return EXT4_INODE_ORDERED_DATA_MODE;	/* ordered */
	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
		return EXT4_INODE_WRITEBACK_DATA_MODE;	/* writeback */
	else
		BUG();
}

static inline int ext4_should_journal_data(struct inode *inode)
{
	return ext4_inode_journal_mode(inode) & EXT4_INODE_JOURNAL_DATA_MODE;
}

static inline int ext4_should_order_data(struct inode *inode)
{
	return ext4_inode_journal_mode(inode) & EXT4_INODE_ORDERED_DATA_MODE;
}

static inline int ext4_should_writeback_data(struct inode *inode)
{
	return ext4_inode_journal_mode(inode) & EXT4_INODE_WRITEBACK_DATA_MODE;
}

/*
 * 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
21f97697	89	* allocated so we need to update only data block */
7c319d32 AK	90	#define EXT4_QUOTA_TRANS_BLOCKS(sb) ((test_opt(sb, QUOTA) \|\|\
	91	EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\
	92	1 : 0)
470decc6 DK	93	/* Amount of blocks needed for quota insert/delete - we do some block writes
470decc6 DK	94	* but inode, sb and group updates are done only once */
7c319d32 AK	95	#define EXT4_QUOTA_INIT_BLOCKS(sb) ((test_opt(sb, QUOTA) \|\|\
	96	EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\
	97	(DQUOT_INIT_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\
	98	+3+DQUOT_INIT_REWRITE) : 0)
	99
	100	#define EXT4_QUOTA_DEL_BLOCKS(sb) ((test_opt(sb, QUOTA) \|\|\
	101	EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) ?\
	102	(DQUOT_DEL_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\
	103	+3+DQUOT_DEL_REWRITE) : 0)
470decc6 DK	104	#else
	105	#define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
	106	#define EXT4_QUOTA_INIT_BLOCKS(sb) 0
	107	#define EXT4_QUOTA_DEL_BLOCKS(sb) 0
	108	#endif
5aca07eb DM	109	#define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb))
	110	#define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb))
	111	#define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))
470decc6	112
18aadd47 BJ	113	/**
	114	* struct ext4_journal_cb_entry - Base structure for callback information.
	115	*
	116	* This struct is a 'seed' structure for a using with your own callback
	117	* structs. If you are using callbacks you must allocate one of these
	118	* or another struct of your own definition which has this struct
	119	* as it's first element and pass it to ext4_journal_callback_add().
	120	*/
	121	struct ext4_journal_cb_entry {
	122	/* list information for other callbacks attached to the same handle */
	123	struct list_head jce_list;
	124
	125	/* Function to call with this callback structure */
	126	void (jce_func)(struct super_block sb,
	127	struct ext4_journal_cb_entry *jce, int error);
	128
	129	/* user data goes here */
	130	};
	131
	132	/**
	133	* ext4_journal_callback_add: add a function to call after transaction commit
	134	* @handle: active journal transaction handle to register callback on
	135	* @func: callback function to call after the transaction has committed:
	136	* @sb: superblock of current filesystem for transaction
	137	* @jce: returned journal callback data
	138	* @rc: journal state at commit (0 = transaction committed properly)
	139	* @jce: journal callback data (internal and function private data struct)
	140	*
	141	* The registered function will be called in the context of the journal thread
	142	* after the transaction for which the handle was created has completed.
	143	*
	144	* No locks are held when the callback function is called, so it is safe to
	145	* call blocking functions from within the callback, but the callback should
	146	* not block or run for too long, or the filesystem will be blocked waiting for
	147	* the next transaction to commit. No journaling functions can be used, or
	148	* there is a risk of deadlock.
	149	*
	150	* There is no guaranteed calling order of multiple registered callbacks on
	151	* the same transaction.
	152	*/
	153	static inline void ext4_journal_callback_add(handle_t *handle,
	154	void (func)(struct super_block sb,
	155	struct ext4_journal_cb_entry *jce,
	156	int rc),
	157	struct ext4_journal_cb_entry *jce)
	158	{
	159	struct ext4_sb_info *sbi =
	160	EXT4_SB(handle->h_transaction->t_journal->j_private);
	161
	162	/* Add the jce to transaction's private list */
	163	jce->jce_func = func;
	164	spin_lock(&sbi->s_md_lock);
	165	list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list);
	166	spin_unlock(&sbi->s_md_lock);
	167	}
	168
	169	/**
	170	* ext4_journal_callback_del: delete a registered callback
	171	* @handle: active journal transaction handle on which callback was registered
	172	* @jce: registered journal callback entry to unregister
	173	*/
	174	static inline void ext4_journal_callback_del(handle_t *handle,
	175	struct ext4_journal_cb_entry *jce)
	176	{
177	struct ext4_sb_info *sbi =
178	EXT4_SB(handle->h_transaction->t_journal->j_private);
179
180	spin_lock(&sbi->s_md_lock);
181	list_del_init(&jce->jce_list);
182	spin_unlock(&sbi->s_md_lock);
183	}
184
470decc6 DK	185	int
	186	ext4_mark_iloc_dirty(handle_t *handle,
	187	struct inode *inode,
	188	struct ext4_iloc *iloc);
	189
	190	/*
	191	* On success, We end up with an outstanding reference count against
	192	* iloc->bh. This _must_ be cleaned up later.
	193	*/
	194
	195	int ext4_reserve_inode_write(handle_t handle, struct inode inode,
	196	struct ext4_iloc *iloc);
	197
	198	int ext4_mark_inode_dirty(handle_t handle, struct inode inode);
	199
	200	/*
e4684b3f	201	* Wrapper functions with which ext4 calls into JBD.
470decc6	202	*/
90c7201b TT	203	void ext4_journal_abort_handle(const char *caller, unsigned int line,
90c7201b TT	204	const char *err_fn,
8984d137	205	struct buffer_head bh, handle_t handle, int err);
470decc6	206
90c7201b TT	207	int __ext4_journal_get_write_access(const char *where, unsigned int line,
90c7201b TT	208	handle_t handle, struct buffer_head bh);
470decc6	209
90c7201b TT	210	int __ext4_forget(const char where, unsigned int line, handle_t handle,
	211	int is_metadata, struct inode *inode,
	212	struct buffer_head *bh, ext4_fsblk_t blocknr);
d6797d14	213
90c7201b	214	int __ext4_journal_get_create_access(const char *where, unsigned int line,
8984d137	215	handle_t handle, struct buffer_head bh);
470decc6	216
90c7201b TT	217	int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
	218	handle_t handle, struct inode inode,
	219	struct buffer_head *bh);
470decc6	220
90c7201b	221	int __ext4_handle_dirty_super(const char *where, unsigned int line,
b50924c2	222	handle_t handle, struct super_block sb);
a0375156	223
470decc6	224	#define ext4_journal_get_write_access(handle, bh) \
90c7201b	225	__ext4_journal_get_write_access(__func__, __LINE__, (handle), (bh))
d6797d14	226	#define ext4_forget(handle, is_metadata, inode, bh, block_nr) \
90c7201b TT	227	__ext4_forget(__func__, __LINE__, (handle), (is_metadata), (inode), \
90c7201b TT	228	(bh), (block_nr))
470decc6	229	#define ext4_journal_get_create_access(handle, bh) \
90c7201b	230	__ext4_journal_get_create_access(__func__, __LINE__, (handle), (bh))
0390131b	231	#define ext4_handle_dirty_metadata(handle, inode, bh) \
90c7201b TT	232	__ext4_handle_dirty_metadata(__func__, __LINE__, (handle), (inode), \
90c7201b TT	233	(bh))
a0375156	234	#define ext4_handle_dirty_super(handle, sb) \
b50924c2	235	__ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb))
470decc6	236
470decc6	237	handle_t ext4_journal_start_sb(struct super_block sb, int nblocks);
c398eda0	238	int __ext4_journal_stop(const char where, unsigned int line, handle_t handle);
470decc6	239
d3d1faf6	240	#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
0390131b	241
d3d1faf6 CW	242	/* Note: Do not use this for NULL handles. This is only to determine if
d3d1faf6 CW	243	* a properly allocated handle is using a journal or not. */
0390131b FM	244	static inline int ext4_handle_valid(handle_t *handle)
0390131b FM	245	{
d3d1faf6	246	if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
0390131b FM	247	return 0;
	248	return 1;
	249	}
	250
	251	static inline void ext4_handle_sync(handle_t *handle)
	252	{
	253	if (ext4_handle_valid(handle))
	254	handle->h_sync = 1;
	255	}
	256
	257	static inline void ext4_handle_release_buffer(handle_t *handle,
	258	struct buffer_head *bh)
	259	{
	260	if (ext4_handle_valid(handle))
	261	jbd2_journal_release_buffer(handle, bh);
	262	}
	263
	264	static inline int ext4_handle_is_aborted(handle_t *handle)
	265	{
	266	if (ext4_handle_valid(handle))
	267	return is_handle_aborted(handle);
	268	return 0;
	269	}
	270
	271	static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed)
	272	{
	273	if (ext4_handle_valid(handle) && handle->h_buffer_credits < needed)
	274	return 0;
	275	return 1;
	276	}
	277
470decc6 DK	278	static inline handle_t ext4_journal_start(struct inode inode, int nblocks)
	279	{
	280	return ext4_journal_start_sb(inode->i_sb, nblocks);
	281	}
	282
	283	#define ext4_journal_stop(handle) \
c398eda0	284	__ext4_journal_stop(__func__, __LINE__, (handle))
470decc6 DK	285
	286	static inline handle_t *ext4_journal_current_handle(void)
	287	{
	288	return journal_current_handle();
	289	}
	290
	291	static inline int ext4_journal_extend(handle_t *handle, int nblocks)
	292	{
0390131b FM	293	if (ext4_handle_valid(handle))
	294	return jbd2_journal_extend(handle, nblocks);
	295	return 0;
470decc6 DK	296	}
	297
	298	static inline int ext4_journal_restart(handle_t *handle, int nblocks)
	299	{
0390131b FM	300	if (ext4_handle_valid(handle))
	301	return jbd2_journal_restart(handle, nblocks);
	302	return 0;
470decc6 DK	303	}
	304
	305	static inline int ext4_journal_blocks_per_page(struct inode *inode)
	306	{
0390131b FM	307	if (EXT4_JOURNAL(inode) != NULL)
	308	return jbd2_journal_blocks_per_page(inode);
	309	return 0;
470decc6 DK	310	}
	311
	312	static inline int ext4_journal_force_commit(journal_t *journal)
	313	{
0390131b FM	314	if (journal)
	315	return jbd2_journal_force_commit(journal);
	316	return 0;
470decc6 DK	317	}
470decc6 DK	318
678aaf48 JK	319	static inline int ext4_jbd2_file_inode(handle_t handle, struct inode inode)
678aaf48 JK	320	{
0390131b	321	if (ext4_handle_valid(handle))
8aefcd55	322	return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode);
0390131b	323	return 0;
678aaf48 JK	324	}
678aaf48 JK	325
b436b9be JK	326	static inline void ext4_update_inode_fsync_trans(handle_t *handle,
	327	struct inode *inode,
	328	int datasync)
	329	{
	330	struct ext4_inode_info *ei = EXT4_I(inode);
	331
	332	if (ext4_handle_valid(handle)) {
	333	ei->i_sync_tid = handle->h_transaction->t_tid;
	334	if (datasync)
	335	ei->i_datasync_tid = handle->h_transaction->t_tid;
	336	}
	337	}
	338
470decc6 DK	339	/* super.c */
	340	int ext4_force_commit(struct super_block *sb);
	341
3d2b1582 LC	342	/*
	343	* Ext4 inode journal modes
	344	*/
	345	#define EXT4_INODE_JOURNAL_DATA_MODE 0x01 /* journal data mode */
	346	#define EXT4_INODE_ORDERED_DATA_MODE 0x02 /* ordered data mode */
	347	#define EXT4_INODE_WRITEBACK_DATA_MODE 0x04 /* writeback data mode */
	348
	349	static inline int ext4_inode_journal_mode(struct inode *inode)
470decc6	350	{
0390131b	351	if (EXT4_JOURNAL(inode) == NULL)
3d2b1582 LC	352	return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
	353	/* We do not support data journalling with delayed allocation */
	354	if (!S_ISREG(inode->i_mode) \|\|
	355	test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
	356	return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
	357	if (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
	358	!test_opt(inode->i_sb, DELALLOC))
	359	return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
	360	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
	361	return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
	362	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
	363	return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
	364	else
	365	BUG();
	366	}
	367
	368	static inline int ext4_should_journal_data(struct inode *inode)
	369	{
	370	return ext4_inode_journal_mode(inode) & EXT4_INODE_JOURNAL_DATA_MODE;
470decc6 DK	371	}
	372
	373	static inline int ext4_should_order_data(struct inode *inode)
	374	{
3d2b1582	375	return ext4_inode_journal_mode(inode) & EXT4_INODE_ORDERED_DATA_MODE;
470decc6 DK	376	}
	377
	378	static inline int ext4_should_writeback_data(struct inode *inode)
	379	{
3d2b1582	380	return ext4_inode_journal_mode(inode) & EXT4_INODE_WRITEBACK_DATA_MODE;
470decc6 DK	381	}
470decc6 DK	382
744692dc JZ	383	/*
	384	* This function controls whether or not we should try to go down the
	385	* dioread_nolock code paths, which makes it safe to avoid taking
	386	* i_mutex for direct I/O reads. This only works for extent-based
206f7ab4 CH	387	* files, and it doesn't work if data journaling is enabled, since the
	388	* dioread_nolock code uses b_private to pass information back to the
	389	* I/O completion handler, and this conflicts with the jbd's use of
	390	* b_private.
744692dc JZ	391	*/
	392	static inline int ext4_should_dioread_nolock(struct inode *inode)
	393	{
	394	if (!test_opt(inode->i_sb, DIOREAD_NOLOCK))
	395	return 0;
744692dc JZ	396	if (!S_ISREG(inode->i_mode))
744692dc JZ	397	return 0;
12e9b892	398	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
744692dc JZ	399	return 0;
	400	if (ext4_should_journal_data(inode))
	401	return 0;
	402	return 1;
	403	}
	404
3dcf5451	405	#endif /* _EXT4_JBD2_H */