[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / xfs_buf_item.h

/*
 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef	__XFS_BUF_ITEM_H__
#define	__XFS_BUF_ITEM_H__

extern kmem_zone_t	*xfs_buf_item_zone;

/*
 * This flag indicates that the buffer contains on disk inodes
 * and requires special recovery handling.
 */
#define	XFS_BLF_INODE_BUF	0x1
/*
 * This flag indicates that the buffer should not be replayed
 * during recovery because its blocks are being freed.
 */
#define	XFS_BLF_CANCEL		0x2
/*
 * This flag indicates that the buffer contains on disk
 * user or group dquots and may require special recovery handling.
 */
#define	XFS_BLF_UDQUOT_BUF	0x4
#define XFS_BLF_PDQUOT_BUF	0x8
#define	XFS_BLF_GDQUOT_BUF	0x10

#define	XFS_BLF_CHUNK		128
#define	XFS_BLF_SHIFT		7
#define	BIT_TO_WORD_SHIFT	5
#define	NBWORD			(NBBY * sizeof(unsigned int))

/*
 * This is the structure used to lay out a buf log item in the
 * log.  The data map describes which 128 byte chunks of the buffer
 * have been logged.
 */
#define XFS_BLF_DATAMAP_SIZE	((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)

typedef struct xfs_buf_log_format {
	unsigned short	blf_type;	/* buf log item type indicator */
	unsigned short	blf_size;	/* size of this item */
	ushort		blf_flags;	/* misc state */
	ushort		blf_len;	/* number of blocks in this buf */
	__int64_t	blf_blkno;	/* starting blkno of this buf */
	unsigned int	blf_map_size;	/* used size of data bitmap in words */
	unsigned int	blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
} xfs_buf_log_format_t;

/*
 * buf log item flags
 */
#define	XFS_BLI_HOLD		0x01
#define	XFS_BLI_DIRTY		0x02
#define	XFS_BLI_STALE		0x04
#define	XFS_BLI_LOGGED		0x08
#define	XFS_BLI_INODE_ALLOC_BUF	0x10
#define XFS_BLI_STALE_INODE	0x20
#define	XFS_BLI_INODE_BUF	0x40

#define XFS_BLI_FLAGS \
	{ XFS_BLI_HOLD,		"HOLD" }, \
	{ XFS_BLI_DIRTY,	"DIRTY" }, \
	{ XFS_BLI_STALE,	"STALE" }, \
	{ XFS_BLI_LOGGED,	"LOGGED" }, \
	{ XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
	{ XFS_BLI_STALE_INODE,	"STALE_INODE" }, \
	{ XFS_BLI_INODE_BUF,	"INODE_BUF" }


#ifdef __KERNEL__

struct xfs_buf;
struct xfs_mount;
struct xfs_buf_log_item;

/*
 * This is the in core log item structure used to track information
 * needed to log buffers.  It tracks how many times the lock has been
 * locked, and which 128 byte chunks of the buffer are dirty.
 */
typedef struct xfs_buf_log_item {
	xfs_log_item_t		bli_item;	/* common item structure */
	struct xfs_buf		*bli_buf;	/* real buffer pointer */
	unsigned int		bli_flags;	/* misc flags */
	unsigned int		bli_recur;	/* lock recursion count */
	atomic_t		bli_refcount;	/* cnt of tp refs */
#ifdef XFS_TRANS_DEBUG
	char			*bli_orig;	/* original buffer copy */
	char			*bli_logged;	/* bytes logged (bitmap) */
#endif
	int			bli_format_count;	/* count of headers */
	struct xfs_buf_log_format *bli_formats;	/* array of in-log header ptrs */
	struct xfs_buf_log_format __bli_format;	/* embedded in-log header */
} xfs_buf_log_item_t;

void	xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
void	xfs_buf_item_relse(struct xfs_buf *);
void	xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
uint	xfs_buf_item_dirty(xfs_buf_log_item_t *);
void	xfs_buf_attach_iodone(struct xfs_buf *,
			      void(*)(struct xfs_buf *, xfs_log_item_t *),
			      xfs_log_item_t *);
void	xfs_buf_iodone_callbacks(struct xfs_buf *);
void	xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);

#ifdef XFS_TRANS_DEBUG
void
xfs_buf_item_flush_log_debug(
	struct xfs_buf *bp,
	uint	first,
	uint	last);
#else
#define	xfs_buf_item_flush_log_debug(bp, first, last)
#endif

#endif	/* __KERNEL__ */

#endif	/* __XFS_BUF_ITEM_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	17	*/
	18	#ifndef __XFS_BUF_ITEM_H__
	19	#define __XFS_BUF_ITEM_H__
	20
a8272ce0 DC	21	extern kmem_zone_t *xfs_buf_item_zone;
a8272ce0 DC	22
1da177e4 LT	23	/*
	24	* This flag indicates that the buffer contains on disk inodes
	25	* and requires special recovery handling.
	26	*/
c1155410	27	#define XFS_BLF_INODE_BUF 0x1
1da177e4 LT	28	/*
	29	* This flag indicates that the buffer should not be replayed
	30	* during recovery because its blocks are being freed.
	31	*/
c1155410	32	#define XFS_BLF_CANCEL 0x2
1da177e4 LT	33	/*
	34	* This flag indicates that the buffer contains on disk
	35	* user or group dquots and may require special recovery handling.
	36	*/
c1155410 DC	37	#define XFS_BLF_UDQUOT_BUF 0x4
	38	#define XFS_BLF_PDQUOT_BUF 0x8
	39	#define XFS_BLF_GDQUOT_BUF 0x10
1da177e4	40
c1155410 DC	41	#define XFS_BLF_CHUNK 128
c1155410 DC	42	#define XFS_BLF_SHIFT 7
1da177e4 LT	43	#define BIT_TO_WORD_SHIFT 5
	44	#define NBWORD (NBBY * sizeof(unsigned int))
	45
77c1a08f DC	46	/*
	47	* This is the structure used to lay out a buf log item in the
	48	* log. The data map describes which 128 byte chunks of the buffer
	49	* have been logged.
	50	*/
	51	#define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)
	52
	53	typedef struct xfs_buf_log_format {
	54	unsigned short blf_type; /* buf log item type indicator */
	55	unsigned short blf_size; /* size of this item */
	56	ushort blf_flags; /* misc state */
	57	ushort blf_len; /* number of blocks in this buf */
	58	__int64_t blf_blkno; /* starting blkno of this buf */
	59	unsigned int blf_map_size; /* used size of data bitmap in words */
	60	unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
	61	} xfs_buf_log_format_t;
	62
1da177e4 LT	63	/*
	64	* buf log item flags
	65	*/
	66	#define XFS_BLI_HOLD 0x01
	67	#define XFS_BLI_DIRTY 0x02
	68	#define XFS_BLI_STALE 0x04
	69	#define XFS_BLI_LOGGED 0x08
	70	#define XFS_BLI_INODE_ALLOC_BUF 0x10
	71	#define XFS_BLI_STALE_INODE 0x20
ccf7c23f	72	#define XFS_BLI_INODE_BUF 0x40
1da177e4	73
0b1b213f CH	74	#define XFS_BLI_FLAGS \
	75	{ XFS_BLI_HOLD, "HOLD" }, \
	76	{ XFS_BLI_DIRTY, "DIRTY" }, \
	77	{ XFS_BLI_STALE, "STALE" }, \
	78	{ XFS_BLI_LOGGED, "LOGGED" }, \
	79	{ XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
ccf7c23f DC	80	{ XFS_BLI_STALE_INODE, "STALE_INODE" }, \
ccf7c23f DC	81	{ XFS_BLI_INODE_BUF, "INODE_BUF" }
0b1b213f	82
1da177e4 LT	83
	84	#ifdef __KERNEL__
	85
	86	struct xfs_buf;
1da177e4 LT	87	struct xfs_mount;
	88	struct xfs_buf_log_item;
	89
1da177e4 LT	90	/*
	91	* This is the in core log item structure used to track information
	92	* needed to log buffers. It tracks how many times the lock has been
	93	* locked, and which 128 byte chunks of the buffer are dirty.
	94	*/
	95	typedef struct xfs_buf_log_item {
	96	xfs_log_item_t bli_item; /* common item structure */
	97	struct xfs_buf bli_buf; / real buffer pointer */
	98	unsigned int bli_flags; /* misc flags */
	99	unsigned int bli_recur; /* lock recursion count */
	100	atomic_t bli_refcount; /* cnt of tp refs */
1da177e4 LT	101	#ifdef XFS_TRANS_DEBUG
	102	char bli_orig; / original buffer copy */
	103	char bli_logged; / bytes logged (bitmap) */
	104	#endif
372cc85e DC	105	int bli_format_count; /* count of headers */
372cc85e DC	106	struct xfs_buf_log_format bli_formats; / array of in-log header ptrs */
0f22f9d0	107	struct xfs_buf_log_format __bli_format; /* embedded in-log header */
1da177e4 LT	108	} xfs_buf_log_item_t;
1da177e4 LT	109
1da177e4 LT	110	void xfs_buf_item_init(struct xfs_buf , struct xfs_mount );
	111	void xfs_buf_item_relse(struct xfs_buf *);
	112	void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
	113	uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
	114	void xfs_buf_attach_iodone(struct xfs_buf *,
	115	void()(struct xfs_buf , xfs_log_item_t *),
	116	xfs_log_item_t *);
	117	void xfs_buf_iodone_callbacks(struct xfs_buf *);
ca30b2a7	118	void xfs_buf_iodone(struct xfs_buf , struct xfs_log_item );
1da177e4 LT	119
	120	#ifdef XFS_TRANS_DEBUG
	121	void
	122	xfs_buf_item_flush_log_debug(
	123	struct xfs_buf *bp,
	124	uint first,
	125	uint last);
	126	#else
	127	#define xfs_buf_item_flush_log_debug(bp, first, last)
	128	#endif
	129
	130	#endif /* __KERNEL__ */
	131
	132	#endif /* __XFS_BUF_ITEM_H__ */