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Add the XFS_BLI_CANCEL flag and the xfs_buf_cancel_t structure
definition.

#ifndef	_XFS_BUF_ITEM_H
#define	_XFS_BUF_ITEM_H

/*
 * 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.
 */
typedef struct xfs_buf_log_format {
	unsigned short	blf_type;	/* buf log item type indicator */
	unsigned short	blf_size;	/* size of this item */
	daddr_t		blf_blkno;	/* starting blkno of this buf */
	ushort		blf_flags;	/* misc state */
	ushort		blf_len;	/* number of blocks in this buf */
	unsigned int	blf_map_size;	/* size of data bitmap in words */
	unsigned int	blf_data_map[1];/* variable size bitmap of */
					/*   regions of buffer in this item */
} xfs_buf_log_format_t;

/*
 * This flag indicates that the buffer contains on disk inodes
 * and requires special recovery handling.
 */
#define	XFS_BLI_INODE_BUF	0x1
/*
 * This flag indicates that the buffer should not be replayed
 * during recovery because its blocks are being freed.
 */
#define	XFS_BLI_CANCEL		0x2

#define	XFS_BLI_CHUNK		128
#define	XFS_BLI_SHIFT		7
#define	BIT_TO_WORD_SHIFT	5
#define	NBWORD			(NBBY * sizeof(unsigned int))

struct ktrace;
/*
 * 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 */
	buf_t			*bli_buf;	/* real buffer pointer */
	unsigned int		bli_flags;	/* misc flags */
	unsigned int		bli_recur;	/* lock recursion count */
	unsigned int		bli_refcount;	/* cnt of tp refs */
	struct ktrace		*bli_trace;	/* event trace buf */
#ifdef DEBUG
	char			*bli_orig;	/* original buffer copy */
	char			*bli_logged;	/* bytes to be logged */
#endif
	xfs_buf_log_format_t	bli_format;	/* in-log header */
} xfs_buf_log_item_t;

/*
 * buf log item flags
 */
#define	XFS_BLI_HOLD	0x1
#define	XFS_BLI_DIRTY	0x2
#define	XFS_BLI_STALE	0x4
#define	XFS_BLI_LOGGED	0x8

/*
 * This structure is used during recovery to record the buf log
 * items which have been canceled and should not be replayed.
 */
typedef struct xfs_buf_cancel {
	daddr_t			bc_blkno;
	uint			bc_len;
	int			bc_refcount;
	struct xfs_buf_cancel	*bc_next;
} xfs_buf_cancel_t;

/*
 * This lock guards the bli_refcount fields of the buf items.
 */
extern lock_t	xfs_bli_reflock;

#define	XFS_BLI_TRACE_SIZE	32
#if	(defined(DEBUG) && !defined(SIM))
void	xfs_buf_item_trace(char *, xfs_buf_log_item_t *);
#else
#define	xfs_buf_item_trace(id, bip)
#endif

void	xfs_buf_item_init(buf_t *, struct xfs_mount *);
void	xfs_buf_item_relse(buf_t *);
void	xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
uint	xfs_buf_item_dirty(xfs_buf_log_item_t *);
int	xfs_buf_item_bits(uint *, uint, uint);
int	xfs_buf_item_contig_bits(uint *, uint, uint);
int	xfs_buf_item_next_bit(uint *, uint, uint);
void	xfs_buf_attach_iodone(buf_t *, void(*)(buf_t*, xfs_log_item_t *),
			      xfs_log_item_t *);
void	xfs_buf_iodone_callbacks(buf_t *);
void	xfs_buf_iodone(buf_t *, xfs_buf_log_item_t *);

#endif	/* _XFS_BUF_ITEM_H */