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Add b_bdstrat and b_fsprivate3 to virtualization interface

#ifndef __XFS_BUF_H__
#define __XFS_BUF_H__

#ifdef SIM
#define _USING_BUF_T
#else
#define _USING_BUF_T
#endif

#ifdef _USING_BUF_T
#include <sys/buf.h>

typedef struct buf xfs_buf_t;
#define xfs_buf buf

#define XFS_BUF_IODONE_FUNC(buf)	(buf)->b_iodone
#define XFS_BUF_SET_IODONE_FUNC(buf, func)	\
			if ((buf)->b_iodone == NULL) { \
				(buf)->b_iodone = (func); \
			}
#define XFS_BUF_CLR_IODONE_FUNC(buf)		\
			(buf)->b_iodone = NULL
#define XFS_BUF_SET_BDSTRAT_FUNC(buf, func)	\
			if ((buf)->b_bdstrat == NULL) { \
				(buf)->b_bdstrat = (func); \
			}
#define XFS_BUF_CLR_BDSTRAT_FUNC(buf)		\
			(buf)->b_bdstrat = NULL

#define XFS_BUF_FSPRIVATE(buf, type)		\
			((type)(buf)->b_fsprivate)
#define XFS_BUF_SET_FSPRIVATE(buf, value)	\
			(buf)->b_fsprivate = (void *)(value)
#define XFS_BUF_FSPRIVATE2(buf, type)		\
			((type)(buf)->b_fsprivate2)
#define XFS_BUF_SET_FSPRIVATE2(buf, value)	\
			(buf)->b_fsprivate2 = (void *)(value)
#define XFS_BUF_FSPRIVATE3(buf, type)		\
			((type)(buf)->b_fsprivate3)
#define XFS_BUF_SET_FSPRIVATE3(buf, value)	\
			(buf)->b_fsprivate3 = (void *)(value)

int
xfs_bdstrat_cb(struct xfs_buf *bp);

#define xfs_bdwrite(mp, bp) \
	{ ((bp)->b_vp == NULL) ? (bp)->b_bdstrat = xfs_bdstrat_cb: 0; \
		(bp)->b_fsprivate3 = (mp); bdwrite(bp);}
#define xfs_bawrite(mp, bp) \
	{ ((bp)->b_vp == NULL) ? (bp)->b_bdstrat = xfs_bdstrat_cb: 0; \
		(bp)->b_fsprivate3 = (mp); bawrite(bp);}

#endif /* _USING_BUF_T */

#ifdef _USING_PAGEBUF_T
#include <linux/page_buf.h>

typedef struct page_buf xfs_buf_t;
#define xfs_buf page_buf

struct inode;

typedef struct buftarg {
	struct inode	*inode;
	dev_t		dev;
} buftarg_t;

#define XFS_BUF_IODONE_FUNC(buf)	(buf)->pb_done
#define XFS_BUF_SET_IODONE_FUNC(buf, func)	\
			if ((buf)->pb_done == NULL) { \
				pagebuf_hold(buf); \
				(buf)->pb_done = (func); \
			}
#define XFS_BUF_CLR_IODONE_FUNC(buf)		\
			if ((buf)->pb_done) { \
				(buf)->pb_done = NULL; \
				pagebuf_rele(buf); \
			}
#define XFS_BUF_SET_BDSTRAT_FUNC(buf, func)
#define XFS_BUF_CLR_BDSTRAT_FUNC(buf)

#define XFS_BUF_FSPRIVATE(buf, type)		\
			((type)(buf)->pb_fspriv)
#define XFS_BUF_SET_FSPRIVATE(buf, value)	\
			(buf)->pb_fspriv = (void *)(value)
#define XFS_BUF_FSPRIVATE2(buf, type)		\
			((type)(buf)->pb_fspriv2)
#define XFS_BUF_SET_FSPRIVATE2(buf, value)	\
			(buf)->pb_fspriv2 = (void *)(value)
#define XFS_BUF_FSPRIVATE3(buf, type)		\
			((type)(buf)->pb_target.i_sb)
#define XFS_BUF_SET_FSPRIVATE3(buf, value)

#define xfs_bdwrite(mp, bp) pagebuf_dwrite(bp)
#define xfs_bawrite(mp, bp) pagebuf_awrite(bp)

#endif /* _USING_PAGEBUF_T */

#endif