fs/xfs/xfs_bmap_btree.h - fp2-dev/kernel/msm - Gitiles

 /*
  * Copyright (c) 2000,2002-2005 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_BMAP_BTREE_H__
 #define __XFS_BMAP_BTREE_H__

 #define XFS_BMAP_MAGIC	0x424d4150	/* 'BMAP' */

 struct xfs_btree_cur;
 struct xfs_btree_lblock;
 struct xfs_mount;
 struct xfs_inode;
 struct xfs_trans;

 /*
  * Bmap root header, on-disk form only.
  */
 typedef struct xfs_bmdr_block {
 	__be16		bb_level;	/* 0 is a leaf */
 	__be16		bb_numrecs;	/* current # of data records */
 } xfs_bmdr_block_t;

 /*
  * Bmap btree record and extent descriptor.
  *  l0:63 is an extent flag (value 1 indicates non-normal).
  *  l0:9-62 are startoff.
  *  l0:0-8 and l1:21-63 are startblock.
  *  l1:0-20 are blockcount.
  */
 #define BMBT_EXNTFLAG_BITLEN	1
 #define BMBT_STARTOFF_BITLEN	54
 #define BMBT_STARTBLOCK_BITLEN	52
 #define BMBT_BLOCKCOUNT_BITLEN	21


 #define BMBT_USE_64	1

 typedef struct xfs_bmbt_rec_32
 {
 	__uint32_t		l0, l1, l2, l3;
 } xfs_bmbt_rec_32_t;
 typedef struct xfs_bmbt_rec_64
 {
 	__be64			l0, l1;
 } xfs_bmbt_rec_64_t;

 typedef __uint64_t	xfs_bmbt_rec_base_t;	/* use this for casts */
 typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;

 typedef struct xfs_bmbt_rec_host {
 	__uint64_t		l0, l1;
 } xfs_bmbt_rec_host_t;

 /*
  * Values and macros for delayed-allocation startblock fields.
  */
 #define STARTBLOCKVALBITS	17
 #define STARTBLOCKMASKBITS	(15 + XFS_BIG_BLKNOS * 20)
 #define DSTARTBLOCKMASKBITS	(15 + 20)
 #define STARTBLOCKMASK		\
 	(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
 #define DSTARTBLOCKMASK		\
 	(((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)

 #define ISNULLSTARTBLOCK(x)	isnullstartblock(x)
 static inline int isnullstartblock(xfs_fsblock_t x)
 {
 	return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
 }

 #define ISNULLDSTARTBLOCK(x)	isnulldstartblock(x)
 static inline int isnulldstartblock(xfs_dfsbno_t x)
 {
 	return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
 }

 #define NULLSTARTBLOCK(k)	nullstartblock(k)
 static inline xfs_fsblock_t nullstartblock(int k)
 {
 	ASSERT(k < (1 << STARTBLOCKVALBITS));
 	return STARTBLOCKMASK | (k);
 }

 #define STARTBLOCKVAL(x)	startblockval(x)
 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
 {
 	return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
 }

 /*
  * Possible extent formats.
  */
 typedef enum {
 	XFS_EXTFMT_NOSTATE = 0,
 	XFS_EXTFMT_HASSTATE
 } xfs_exntfmt_t;

 /*
  * Possible extent states.
  */
 typedef enum {
 	XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
 	XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
 } xfs_exntst_t;

 /*
  * Extent state and extent format macros.
  */
 #define XFS_EXTFMT_INODE(x)	\
 	(xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
 		XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
 #define ISUNWRITTEN(x)	((x)->br_state == XFS_EXT_UNWRITTEN)

 /*
  * Incore version of above.
  */
 typedef struct xfs_bmbt_irec
 {
 	xfs_fileoff_t	br_startoff;	/* starting file offset */
 	xfs_fsblock_t	br_startblock;	/* starting block number */
 	xfs_filblks_t	br_blockcount;	/* number of blocks */
 	xfs_exntst_t	br_state;	/* extent state */
 } xfs_bmbt_irec_t;

 /*
  * Key structure for non-leaf levels of the tree.
  */
 typedef struct xfs_bmbt_key {
 	__be64		br_startoff;	/* starting file offset */
 } xfs_bmbt_key_t, xfs_bmdr_key_t;

 /* btree pointer type */
 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;

 /* btree block header type */
 typedef struct xfs_btree_lblock xfs_bmbt_block_t;

 #define XFS_BUF_TO_BMBT_BLOCK(bp)	((xfs_bmbt_block_t *)XFS_BUF_PTR(bp))

 #define XFS_BMAP_RBLOCK_DSIZE(lev,cur)	((cur)->bc_private.b.forksize)
 #define XFS_BMAP_RBLOCK_ISIZE(lev,cur)	\
 	((int)XFS_IFORK_PTR((cur)->bc_private.b.ip, \
 		    (cur)->bc_private.b.whichfork)->if_broot_bytes)

 #define XFS_BMAP_BLOCK_DMAXRECS(lev,cur) \
 	(((lev) == (cur)->bc_nlevels - 1 ? \
 		XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur), \
 			xfs_bmdr, (lev) == 0) : \
 		((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
 #define XFS_BMAP_BLOCK_IMAXRECS(lev,cur) \
 	(((lev) == (cur)->bc_nlevels - 1 ? \
 			XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
 				xfs_bmbt, (lev) == 0) : \
 			((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))

 #define XFS_BMAP_BLOCK_DMINRECS(lev,cur) \
 	(((lev) == (cur)->bc_nlevels - 1 ? \
 			XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur),\
 				xfs_bmdr, (lev) == 0) : \
 			((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
 #define XFS_BMAP_BLOCK_IMINRECS(lev,cur) \
 	(((lev) == (cur)->bc_nlevels - 1 ? \
 			XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
 				xfs_bmbt, (lev) == 0) : \
 			((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))

 #define XFS_BMAP_REC_DADDR(bb,i,cur)	(XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))

 #define XFS_BMAP_REC_IADDR(bb,i,cur)	(XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))

 #define XFS_BMAP_KEY_DADDR(bb,i,cur)	\
 	(XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))

 #define XFS_BMAP_KEY_IADDR(bb,i,cur)	\
 	(XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))

 #define XFS_BMAP_PTR_DADDR(bb,i,cur)	\
 	(XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS(	\
 				be16_to_cpu((bb)->bb_level), cur)))
 #define XFS_BMAP_PTR_IADDR(bb,i,cur)	\
 	(XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS(	\
 				be16_to_cpu((bb)->bb_level), cur)))

 /*
  * These are to be used when we know the size of the block and
  * we don't have a cursor.
  */
 #define XFS_BMAP_BROOT_REC_ADDR(bb,i,sz) \
 	(XFS_BTREE_REC_ADDR(xfs_bmbt,bb,i))
 #define XFS_BMAP_BROOT_KEY_ADDR(bb,i,sz) \
 	(XFS_BTREE_KEY_ADDR(xfs_bmbt,bb,i))
 #define XFS_BMAP_BROOT_PTR_ADDR(bb,i,sz) \
 	(XFS_BTREE_PTR_ADDR(xfs_bmbt,bb,i,XFS_BMAP_BROOT_MAXRECS(sz)))

 #define XFS_BMAP_BROOT_NUMRECS(bb)	be16_to_cpu((bb)->bb_numrecs)
 #define XFS_BMAP_BROOT_MAXRECS(sz)	XFS_BTREE_BLOCK_MAXRECS(sz,xfs_bmbt,0)

 #define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
 	(int)(sizeof(xfs_bmbt_block_t) + \
 	       ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))

 #define XFS_BMAP_BROOT_SPACE(bb) \
 	(XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
 #define XFS_BMDR_SPACE_CALC(nrecs) \
 	(int)(sizeof(xfs_bmdr_block_t) + \
 	       ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))

 /*
  * Maximum number of bmap btree levels.
  */
 #define XFS_BM_MAXLEVELS(mp,w)		((mp)->m_bm_maxlevels[(w)])

 #define XFS_BMAP_SANITY_CHECK(mp,bb,level) \
 	(be32_to_cpu((bb)->bb_magic) == XFS_BMAP_MAGIC && \
 	 be16_to_cpu((bb)->bb_level) == level && \
 	 be16_to_cpu((bb)->bb_numrecs) > 0 && \
 	 be16_to_cpu((bb)->bb_numrecs) <= (mp)->m_bmap_dmxr[(level) != 0])


 #ifdef __KERNEL__

 /*
  * Prototypes for xfs_bmap.c to call.
  */
 extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t *, int, xfs_bmbt_block_t *, int);
 extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
 extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
 extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
 extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
 extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);

 extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);

 extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
 extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
 			xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
 extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
 extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
 extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
 extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);

 extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
 extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
 			xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);

 extern void xfs_bmbt_to_bmdr(xfs_bmbt_block_t *, int, xfs_bmdr_block_t *, int);

 extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
 		struct xfs_trans *, struct xfs_inode *, int);

 #endif	/* __KERNEL__ */

 #endif	/* __XFS_BMAP_BTREE_H__ */
	/*
	* Copyright (c) 2000,2002-2005 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_BMAP_BTREE_H__
	#define __XFS_BMAP_BTREE_H__

	#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */

	struct xfs_btree_cur;
	struct xfs_btree_lblock;
	struct xfs_mount;
	struct xfs_inode;
	struct xfs_trans;

	/*
	* Bmap root header, on-disk form only.
	*/
	typedef struct xfs_bmdr_block {
	__be16 bb_level; /* 0 is a leaf */
	__be16 bb_numrecs; /* current # of data records */
	} xfs_bmdr_block_t;

	/*
	* Bmap btree record and extent descriptor.
	* l0:63 is an extent flag (value 1 indicates non-normal).
	* l0:9-62 are startoff.
	* l0:0-8 and l1:21-63 are startblock.
	* l1:0-20 are blockcount.
	*/
	#define BMBT_EXNTFLAG_BITLEN 1
	#define BMBT_STARTOFF_BITLEN 54
	#define BMBT_STARTBLOCK_BITLEN 52
	#define BMBT_BLOCKCOUNT_BITLEN 21


	#define BMBT_USE_64 1

	typedef struct xfs_bmbt_rec_32
	{
	__uint32_t l0, l1, l2, l3;
	} xfs_bmbt_rec_32_t;
	typedef struct xfs_bmbt_rec_64
	{
	__be64 l0, l1;
	} xfs_bmbt_rec_64_t;

	typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
	typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;

	typedef struct xfs_bmbt_rec_host {
	__uint64_t l0, l1;
	} xfs_bmbt_rec_host_t;

	/*
	* Values and macros for delayed-allocation startblock fields.
	*/
	#define STARTBLOCKVALBITS 17
	#define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
	#define DSTARTBLOCKMASKBITS (15 + 20)
	#define STARTBLOCKMASK \
	(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
	#define DSTARTBLOCKMASK \
	(((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)

	#define ISNULLSTARTBLOCK(x) isnullstartblock(x)
	static inline int isnullstartblock(xfs_fsblock_t x)
	{
	return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
	}

	#define ISNULLDSTARTBLOCK(x) isnulldstartblock(x)
	static inline int isnulldstartblock(xfs_dfsbno_t x)
	{
	return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
	}

	#define NULLSTARTBLOCK(k) nullstartblock(k)
	static inline xfs_fsblock_t nullstartblock(int k)
	{
	ASSERT(k < (1 << STARTBLOCKVALBITS));
	return STARTBLOCKMASK \| (k);
	}

	#define STARTBLOCKVAL(x) startblockval(x)
	static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
	{
	return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
	}

	/*
	* Possible extent formats.
	*/
	typedef enum {
	XFS_EXTFMT_NOSTATE = 0,
	XFS_EXTFMT_HASSTATE
	} xfs_exntfmt_t;

	/*
	* Possible extent states.
	*/
	typedef enum {
	XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
	XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
	} xfs_exntst_t;

	/*
	* Extent state and extent format macros.
	*/
	#define XFS_EXTFMT_INODE(x) \
	(xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
	XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
	#define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)

	/*
	* Incore version of above.
	*/
	typedef struct xfs_bmbt_irec
	{
	xfs_fileoff_t br_startoff; /* starting file offset */
	xfs_fsblock_t br_startblock; /* starting block number */
	xfs_filblks_t br_blockcount; /* number of blocks */
	xfs_exntst_t br_state; /* extent state */
	} xfs_bmbt_irec_t;

	/*
	* Key structure for non-leaf levels of the tree.
	*/
	typedef struct xfs_bmbt_key {
	__be64 br_startoff; /* starting file offset */
	} xfs_bmbt_key_t, xfs_bmdr_key_t;

	/* btree pointer type */
	typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;

	/* btree block header type */
	typedef struct xfs_btree_lblock xfs_bmbt_block_t;

	#define XFS_BUF_TO_BMBT_BLOCK(bp) ((xfs_bmbt_block_t *)XFS_BUF_PTR(bp))

	#define XFS_BMAP_RBLOCK_DSIZE(lev,cur) ((cur)->bc_private.b.forksize)
	#define XFS_BMAP_RBLOCK_ISIZE(lev,cur) \
	((int)XFS_IFORK_PTR((cur)->bc_private.b.ip, \
	(cur)->bc_private.b.whichfork)->if_broot_bytes)

	#define XFS_BMAP_BLOCK_DMAXRECS(lev,cur) \
	(((lev) == (cur)->bc_nlevels - 1 ? \
	XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur), \
	xfs_bmdr, (lev) == 0) : \
	((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
	#define XFS_BMAP_BLOCK_IMAXRECS(lev,cur) \
	(((lev) == (cur)->bc_nlevels - 1 ? \
	XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
	xfs_bmbt, (lev) == 0) : \
	((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))

	#define XFS_BMAP_BLOCK_DMINRECS(lev,cur) \
	(((lev) == (cur)->bc_nlevels - 1 ? \
	XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur),\
	xfs_bmdr, (lev) == 0) : \
	((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
	#define XFS_BMAP_BLOCK_IMINRECS(lev,cur) \
	(((lev) == (cur)->bc_nlevels - 1 ? \
	XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
	xfs_bmbt, (lev) == 0) : \
	((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))

	#define XFS_BMAP_REC_DADDR(bb,i,cur) (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))

	#define XFS_BMAP_REC_IADDR(bb,i,cur) (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))

	#define XFS_BMAP_KEY_DADDR(bb,i,cur) \
	(XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))

	#define XFS_BMAP_KEY_IADDR(bb,i,cur) \
	(XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))

	#define XFS_BMAP_PTR_DADDR(bb,i,cur) \
	(XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS( \
	be16_to_cpu((bb)->bb_level), cur)))
	#define XFS_BMAP_PTR_IADDR(bb,i,cur) \
	(XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS( \
	be16_to_cpu((bb)->bb_level), cur)))

	/*
	* These are to be used when we know the size of the block and
	* we don't have a cursor.
	*/
	#define XFS_BMAP_BROOT_REC_ADDR(bb,i,sz) \
	(XFS_BTREE_REC_ADDR(xfs_bmbt,bb,i))
	#define XFS_BMAP_BROOT_KEY_ADDR(bb,i,sz) \
	(XFS_BTREE_KEY_ADDR(xfs_bmbt,bb,i))
	#define XFS_BMAP_BROOT_PTR_ADDR(bb,i,sz) \
	(XFS_BTREE_PTR_ADDR(xfs_bmbt,bb,i,XFS_BMAP_BROOT_MAXRECS(sz)))

	#define XFS_BMAP_BROOT_NUMRECS(bb) be16_to_cpu((bb)->bb_numrecs)
	#define XFS_BMAP_BROOT_MAXRECS(sz) XFS_BTREE_BLOCK_MAXRECS(sz,xfs_bmbt,0)

	#define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
	(int)(sizeof(xfs_bmbt_block_t) + \
	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))

	#define XFS_BMAP_BROOT_SPACE(bb) \
	(XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
	#define XFS_BMDR_SPACE_CALC(nrecs) \
	(int)(sizeof(xfs_bmdr_block_t) + \
	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))

	/*
	* Maximum number of bmap btree levels.
	*/
	#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])

	#define XFS_BMAP_SANITY_CHECK(mp,bb,level) \
	(be32_to_cpu((bb)->bb_magic) == XFS_BMAP_MAGIC && \
	be16_to_cpu((bb)->bb_level) == level && \
	be16_to_cpu((bb)->bb_numrecs) > 0 && \
	be16_to_cpu((bb)->bb_numrecs) <= (mp)->m_bmap_dmxr[(level) != 0])


	#ifdef __KERNEL__

	/*
	* Prototypes for xfs_bmap.c to call.
	*/
	extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t , int, xfs_bmbt_block_t , int);
	extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t r, xfs_bmbt_irec_t s);
	extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
	extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
	extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
	extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);

	extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
	extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
	extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);

	extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t r, xfs_bmbt_irec_t s);
	extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
	extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
	extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
	extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
	extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);

	extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
	extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);

	extern void xfs_bmbt_to_bmdr(xfs_bmbt_block_t , int, xfs_bmdr_block_t , int);

	extern struct xfs_btree_cur xfs_bmbt_init_cursor(struct xfs_mount ,
	struct xfs_trans , struct xfs_inode , int);

	#endif /* __KERNEL__ */

	#endif /* __XFS_BMAP_BTREE_H__ */