fs/xfs/xfs_bmap_btree.h - maze/linux - Git at Google

 /*
  * 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;

 /*
  * 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.
  * For 32-bit kernels,
  *  l0:31 is an extent flag (value 1 indicates non-normal).
  *  l0:0-30 and l1:9-31 are startoff.
  *  l1:0-8, l2:0-31, and l3:21-31 are startblock.
  *  l3:0-20 are blockcount.
  * For 64-bit kernels,
  *  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.
  */

 #ifndef XFS_NATIVE_HOST

 #define BMBT_TOTAL_BITLEN	128	/* 128 bits, 16 bytes */
 #define BMBT_EXNTFLAG_BITOFF	0
 #define BMBT_EXNTFLAG_BITLEN	1
 #define BMBT_STARTOFF_BITOFF	(BMBT_EXNTFLAG_BITOFF + BMBT_EXNTFLAG_BITLEN)
 #define BMBT_STARTOFF_BITLEN	54
 #define BMBT_STARTBLOCK_BITOFF	(BMBT_STARTOFF_BITOFF + BMBT_STARTOFF_BITLEN)
 #define BMBT_STARTBLOCK_BITLEN	52
 #define BMBT_BLOCKCOUNT_BITOFF	\
 	(BMBT_STARTBLOCK_BITOFF + BMBT_STARTBLOCK_BITLEN)
 #define BMBT_BLOCKCOUNT_BITLEN	(BMBT_TOTAL_BITLEN - BMBT_BLOCKCOUNT_BITOFF)

 #else

 #define BMBT_TOTAL_BITLEN	128	/* 128 bits, 16 bytes */
 #define BMBT_EXNTFLAG_BITOFF	63
 #define BMBT_EXNTFLAG_BITLEN	1
 #define BMBT_STARTOFF_BITOFF	(BMBT_EXNTFLAG_BITOFF - BMBT_STARTOFF_BITLEN)
 #define BMBT_STARTOFF_BITLEN	54
 #define BMBT_STARTBLOCK_BITOFF	85 /* 128 - 43 (other 9 is in first word) */
 #define BMBT_STARTBLOCK_BITLEN	52
 #define BMBT_BLOCKCOUNT_BITOFF	64 /* Start of second 64 bit container */
 #define BMBT_BLOCKCOUNT_BITLEN	21

 #endif /* XFS_NATIVE_HOST */


 #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
 {
 	__uint64_t		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__

 #if defined(XFS_BMBT_TRACE)
 /*
  * Trace buffer entry types.
  */
 #define XFS_BMBT_KTRACE_ARGBI	1
 #define XFS_BMBT_KTRACE_ARGBII	2
 #define XFS_BMBT_KTRACE_ARGFFFI 3
 #define XFS_BMBT_KTRACE_ARGI	4
 #define XFS_BMBT_KTRACE_ARGIFK	5
 #define XFS_BMBT_KTRACE_ARGIFR	6
 #define XFS_BMBT_KTRACE_ARGIK	7
 #define XFS_BMBT_KTRACE_CUR	8

 #define XFS_BMBT_TRACE_SIZE	4096	/* size of global trace buffer */
 #define XFS_BMBT_KTRACE_SIZE	32	/* size of per-inode trace buffer */
 extern ktrace_t	*xfs_bmbt_trace_buf;
 #endif

 /*
  * Prototypes for xfs_bmap.c to call.
  */
 extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t *, int, xfs_bmbt_block_t *, int);
 extern int xfs_bmbt_decrement(struct xfs_btree_cur *, int, int *);
 extern int xfs_bmbt_delete(struct xfs_btree_cur *, int *);
 extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
 extern xfs_bmbt_block_t *xfs_bmbt_get_block(struct xfs_btree_cur *cur,
 						int, struct xfs_buf **bpp);
 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);

 #ifndef XFS_NATIVE_HOST
 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);
 #else
 #define xfs_bmbt_disk_get_all(r, s)	xfs_bmbt_get_all(r, s)
 #define xfs_bmbt_disk_get_blockcount(r)	xfs_bmbt_get_blockcount(r)
 #define xfs_bmbt_disk_get_startoff(r)	xfs_bmbt_get_startoff(r)
 #endif /* XFS_NATIVE_HOST */

 extern int xfs_bmbt_increment(struct xfs_btree_cur *, int, int *);
 extern int xfs_bmbt_insert(struct xfs_btree_cur *, int *);
 extern void xfs_bmbt_log_block(struct xfs_btree_cur *, struct xfs_buf *, int);
 extern void xfs_bmbt_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int,
 				int);
 extern int xfs_bmbt_lookup_eq(struct xfs_btree_cur *, xfs_fileoff_t,
 				xfs_fsblock_t, xfs_filblks_t, int *);
 extern int xfs_bmbt_lookup_ge(struct xfs_btree_cur *, xfs_fileoff_t,
 				xfs_fsblock_t, xfs_filblks_t, int *);

 /*
  * Give the bmap btree a new root block.  Copy the old broot contents
  * down into a real block and make the broot point to it.
  */
 extern int xfs_bmbt_newroot(struct xfs_btree_cur *cur, int *lflags, int *stat);

 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);

 #ifndef XFS_NATIVE_HOST
 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);
 #else
 #define xfs_bmbt_disk_set_all(r, s)		xfs_bmbt_set_all(r, s)
 #define xfs_bmbt_disk_set_allf(r, o, b, c, v)	xfs_bmbt_set_allf(r, o, b, c, v)
 #endif /* XFS_NATIVE_HOST */

 extern void xfs_bmbt_to_bmdr(xfs_bmbt_block_t *, int, xfs_bmdr_block_t *, int);
 extern int xfs_bmbt_update(struct xfs_btree_cur *, xfs_fileoff_t,
 				xfs_fsblock_t, xfs_filblks_t, xfs_exntst_t);

 #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;

	/*
	* 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.
	* For 32-bit kernels,
	* l0:31 is an extent flag (value 1 indicates non-normal).
	* l0:0-30 and l1:9-31 are startoff.
	* l1:0-8, l2:0-31, and l3:21-31 are startblock.
	* l3:0-20 are blockcount.
	* For 64-bit kernels,
	* 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.
	*/

	#ifndef XFS_NATIVE_HOST

	#define BMBT_TOTAL_BITLEN 128 /* 128 bits, 16 bytes */
	#define BMBT_EXNTFLAG_BITOFF 0
	#define BMBT_EXNTFLAG_BITLEN 1
	#define BMBT_STARTOFF_BITOFF (BMBT_EXNTFLAG_BITOFF + BMBT_EXNTFLAG_BITLEN)
	#define BMBT_STARTOFF_BITLEN 54
	#define BMBT_STARTBLOCK_BITOFF (BMBT_STARTOFF_BITOFF + BMBT_STARTOFF_BITLEN)
	#define BMBT_STARTBLOCK_BITLEN 52
	#define BMBT_BLOCKCOUNT_BITOFF \
	(BMBT_STARTBLOCK_BITOFF + BMBT_STARTBLOCK_BITLEN)
	#define BMBT_BLOCKCOUNT_BITLEN (BMBT_TOTAL_BITLEN - BMBT_BLOCKCOUNT_BITOFF)

	#else

	#define BMBT_TOTAL_BITLEN 128 /* 128 bits, 16 bytes */
	#define BMBT_EXNTFLAG_BITOFF 63
	#define BMBT_EXNTFLAG_BITLEN 1
	#define BMBT_STARTOFF_BITOFF (BMBT_EXNTFLAG_BITOFF - BMBT_STARTOFF_BITLEN)
	#define BMBT_STARTOFF_BITLEN 54
	#define BMBT_STARTBLOCK_BITOFF 85 /* 128 - 43 (other 9 is in first word) */
	#define BMBT_STARTBLOCK_BITLEN 52
	#define BMBT_BLOCKCOUNT_BITOFF 64 /* Start of second 64 bit container */
	#define BMBT_BLOCKCOUNT_BITLEN 21

	#endif /* XFS_NATIVE_HOST */


	#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
	{
	__uint64_t 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__

	#if defined(XFS_BMBT_TRACE)
	/*
	* Trace buffer entry types.
	*/
	#define XFS_BMBT_KTRACE_ARGBI 1
	#define XFS_BMBT_KTRACE_ARGBII 2
	#define XFS_BMBT_KTRACE_ARGFFFI 3
	#define XFS_BMBT_KTRACE_ARGI 4
	#define XFS_BMBT_KTRACE_ARGIFK 5
	#define XFS_BMBT_KTRACE_ARGIFR 6
	#define XFS_BMBT_KTRACE_ARGIK 7
	#define XFS_BMBT_KTRACE_CUR 8

	#define XFS_BMBT_TRACE_SIZE 4096 /* size of global trace buffer */
	#define XFS_BMBT_KTRACE_SIZE 32 /* size of per-inode trace buffer */
	extern ktrace_t *xfs_bmbt_trace_buf;
	#endif

	/*
	* Prototypes for xfs_bmap.c to call.
	*/
	extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t , int, xfs_bmbt_block_t , int);
	extern int xfs_bmbt_decrement(struct xfs_btree_cur , int, int );
	extern int xfs_bmbt_delete(struct xfs_btree_cur , int );
	extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t r, xfs_bmbt_irec_t s);
	extern xfs_bmbt_block_t xfs_bmbt_get_block(struct xfs_btree_cur cur,
	int, struct xfs_buf **bpp);
	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);

	#ifndef XFS_NATIVE_HOST
	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);
	#else
	#define xfs_bmbt_disk_get_all(r, s) xfs_bmbt_get_all(r, s)
	#define xfs_bmbt_disk_get_blockcount(r) xfs_bmbt_get_blockcount(r)
	#define xfs_bmbt_disk_get_startoff(r) xfs_bmbt_get_startoff(r)
	#endif /* XFS_NATIVE_HOST */

	extern int xfs_bmbt_increment(struct xfs_btree_cur , int, int );
	extern int xfs_bmbt_insert(struct xfs_btree_cur , int );
	extern void xfs_bmbt_log_block(struct xfs_btree_cur , struct xfs_buf , int);
	extern void xfs_bmbt_log_recs(struct xfs_btree_cur , struct xfs_buf , int,
	int);
	extern int xfs_bmbt_lookup_eq(struct xfs_btree_cur *, xfs_fileoff_t,
	xfs_fsblock_t, xfs_filblks_t, int *);
	extern int xfs_bmbt_lookup_ge(struct xfs_btree_cur *, xfs_fileoff_t,
	xfs_fsblock_t, xfs_filblks_t, int *);

	/*
	* Give the bmap btree a new root block. Copy the old broot contents
	* down into a real block and make the broot point to it.
	*/
	extern int xfs_bmbt_newroot(struct xfs_btree_cur cur, int lflags, int *stat);

	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);

	#ifndef XFS_NATIVE_HOST
	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);
	#else
	#define xfs_bmbt_disk_set_all(r, s) xfs_bmbt_set_all(r, s)
	#define xfs_bmbt_disk_set_allf(r, o, b, c, v) xfs_bmbt_set_allf(r, o, b, c, v)
	#endif /* XFS_NATIVE_HOST */

	extern void xfs_bmbt_to_bmdr(xfs_bmbt_block_t , int, xfs_bmdr_block_t , int);
	extern int xfs_bmbt_update(struct xfs_btree_cur *, xfs_fileoff_t,
	xfs_fsblock_t, xfs_filblks_t, xfs_exntst_t);

	#endif /* __KERNEL__ */

	#endif /* __XFS_BMAP_BTREE_H__ */