[deliverable/linux.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	(1<<0)
/*
 * This flag indicates that the buffer should not be replayed
 * during recovery because its blocks are being freed.
 */
#define	XFS_BLF_CANCEL		(1<<1)

/*
 * This flag indicates that the buffer contains on disk
 * user or group dquots and may require special recovery handling.
 */
#define	XFS_BLF_UDQUOT_BUF	(1<<2)
#define XFS_BLF_PDQUOT_BUF	(1<<3)
#define	XFS_BLF_GDQUOT_BUF	(1<<4)

/*
 * all buffers now need flags to tell recovery where the magic number
 * is so that it can verify and calculate the CRCs on the buffer correctly
 * once the changes have been replayed into the buffer.
 */
#define XFS_BLF_BTREE_BUF	(1<<5)
#define XFS_BLF_AGF_BUF		(1<<6)

#define XFS_BLF_TYPE_MASK	\
		(XFS_BLF_UDQUOT_BUF | \
		 XFS_BLF_PDQUOT_BUF | \
		 XFS_BLF_GDQUOT_BUF | \
		 XFS_BLF_BTREE_BUF | \
		 XFS_BLF_AGF_BUF)

#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 */
	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 *);

#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	*/
ee1a47ab	27	#define XFS_BLF_INODE_BUF (1<<0)
1da177e4 LT	28	/*
	29	* This flag indicates that the buffer should not be replayed
	30	* during recovery because its blocks are being freed.
	31	*/
ee1a47ab CH	32	#define XFS_BLF_CANCEL (1<<1)
ee1a47ab CH	33
1da177e4 LT	34	/*
	35	* This flag indicates that the buffer contains on disk
	36	* user or group dquots and may require special recovery handling.
	37	*/
ee1a47ab CH	38	#define XFS_BLF_UDQUOT_BUF (1<<2)
	39	#define XFS_BLF_PDQUOT_BUF (1<<3)
	40	#define XFS_BLF_GDQUOT_BUF (1<<4)
	41
	42	/*
	43	* all buffers now need flags to tell recovery where the magic number
	44	* is so that it can verify and calculate the CRCs on the buffer correctly
	45	* once the changes have been replayed into the buffer.
	46	*/
	47	#define XFS_BLF_BTREE_BUF (1<<5)
4e0e6040	48	#define XFS_BLF_AGF_BUF (1<<6)
ee1a47ab CH	49
	50	#define XFS_BLF_TYPE_MASK \
	51	(XFS_BLF_UDQUOT_BUF \| \
	52	XFS_BLF_PDQUOT_BUF \| \
	53	XFS_BLF_GDQUOT_BUF \| \
4e0e6040 DC	54	XFS_BLF_BTREE_BUF \| \
4e0e6040 DC	55	XFS_BLF_AGF_BUF)
1da177e4	56
c1155410 DC	57	#define XFS_BLF_CHUNK 128
c1155410 DC	58	#define XFS_BLF_SHIFT 7
1da177e4 LT	59	#define BIT_TO_WORD_SHIFT 5
	60	#define NBWORD (NBBY * sizeof(unsigned int))
	61
77c1a08f DC	62	/*
	63	* This is the structure used to lay out a buf log item in the
	64	* log. The data map describes which 128 byte chunks of the buffer
	65	* have been logged.
	66	*/
	67	#define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)
	68
	69	typedef struct xfs_buf_log_format {
	70	unsigned short blf_type; /* buf log item type indicator */
	71	unsigned short blf_size; /* size of this item */
	72	ushort blf_flags; /* misc state */
	73	ushort blf_len; /* number of blocks in this buf */
	74	__int64_t blf_blkno; /* starting blkno of this buf */
	75	unsigned int blf_map_size; /* used size of data bitmap in words */
	76	unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
	77	} xfs_buf_log_format_t;
	78
1da177e4 LT	79	/*
	80	* buf log item flags
	81	*/
	82	#define XFS_BLI_HOLD 0x01
	83	#define XFS_BLI_DIRTY 0x02
	84	#define XFS_BLI_STALE 0x04
	85	#define XFS_BLI_LOGGED 0x08
	86	#define XFS_BLI_INODE_ALLOC_BUF 0x10
	87	#define XFS_BLI_STALE_INODE 0x20
ccf7c23f	88	#define XFS_BLI_INODE_BUF 0x40
1da177e4	89
0b1b213f CH	90	#define XFS_BLI_FLAGS \
	91	{ XFS_BLI_HOLD, "HOLD" }, \
	92	{ XFS_BLI_DIRTY, "DIRTY" }, \
	93	{ XFS_BLI_STALE, "STALE" }, \
	94	{ XFS_BLI_LOGGED, "LOGGED" }, \
	95	{ XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
ccf7c23f DC	96	{ XFS_BLI_STALE_INODE, "STALE_INODE" }, \
ccf7c23f DC	97	{ XFS_BLI_INODE_BUF, "INODE_BUF" }
0b1b213f	98
1da177e4 LT	99
	100	#ifdef __KERNEL__
	101
	102	struct xfs_buf;
1da177e4 LT	103	struct xfs_mount;
	104	struct xfs_buf_log_item;
	105
1da177e4 LT	106	/*
	107	* This is the in core log item structure used to track information
	108	* needed to log buffers. It tracks how many times the lock has been
	109	* locked, and which 128 byte chunks of the buffer are dirty.
	110	*/
	111	typedef struct xfs_buf_log_item {
	112	xfs_log_item_t bli_item; /* common item structure */
	113	struct xfs_buf bli_buf; / real buffer pointer */
	114	unsigned int bli_flags; /* misc flags */
	115	unsigned int bli_recur; /* lock recursion count */
	116	atomic_t bli_refcount; /* cnt of tp refs */
372cc85e DC	117	int bli_format_count; /* count of headers */
372cc85e DC	118	struct xfs_buf_log_format bli_formats; / array of in-log header ptrs */
b9438173	119	struct xfs_buf_log_format __bli_format; /* embedded in-log header */
1da177e4 LT	120	} xfs_buf_log_item_t;
1da177e4 LT	121
1da177e4 LT	122	void xfs_buf_item_init(struct xfs_buf , struct xfs_mount );
	123	void xfs_buf_item_relse(struct xfs_buf *);
	124	void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
	125	uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
	126	void xfs_buf_attach_iodone(struct xfs_buf *,
	127	void()(struct xfs_buf , xfs_log_item_t *),
	128	xfs_log_item_t *);
	129	void xfs_buf_iodone_callbacks(struct xfs_buf *);
ca30b2a7	130	void xfs_buf_iodone(struct xfs_buf , struct xfs_log_item );
1da177e4	131
1da177e4 LT	132	#endif /* __KERNEL__ */
	133
	134	#endif /* __XFS_BUF_ITEM_H__ */