[linux.git] / fs / xfs / 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_block;
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)

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

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

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

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 size depends on a superblock flag.
 *
 * (not quite yet, but soon)
 */
#define XFS_BMBT_BLOCK_LEN(mp)	XFS_BTREE_LBLOCK_LEN

#define XFS_BMBT_REC_ADDR(mp, block, index) \
	((xfs_bmbt_rec_t *) \
		((char *)(block) + \
		 XFS_BMBT_BLOCK_LEN(mp) + \
		 ((index) - 1) * sizeof(xfs_bmbt_rec_t)))

#define XFS_BMBT_KEY_ADDR(mp, block, index) \
	((xfs_bmbt_key_t *) \
		((char *)(block) + \
		 XFS_BMBT_BLOCK_LEN(mp) + \
		 ((index) - 1) * sizeof(xfs_bmbt_key_t)))

#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
	((xfs_bmbt_ptr_t *) \
		((char *)(block) + \
		 XFS_BMBT_BLOCK_LEN(mp) + \
		 (maxrecs) * sizeof(xfs_bmbt_key_t) + \
		 ((index) - 1) * sizeof(xfs_bmbt_ptr_t)))

#define XFS_BMDR_REC_ADDR(block, index) \
	((xfs_bmdr_rec_t *) \
		((char *)(block) + \
		 sizeof(struct xfs_bmdr_block) + \
	         ((index) - 1) * sizeof(xfs_bmdr_rec_t)))

#define XFS_BMDR_KEY_ADDR(block, index) \
	((xfs_bmdr_key_t *) \
		((char *)(block) + \
		 sizeof(struct xfs_bmdr_block) + \
		 ((index) - 1) * sizeof(xfs_bmdr_key_t)))

#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
	((xfs_bmdr_ptr_t *) \
		((char *)(block) + \
		 sizeof(struct xfs_bmdr_block) + \
		 (maxrecs) * sizeof(xfs_bmdr_key_t) + \
		 ((index) - 1) * sizeof(xfs_bmdr_ptr_t)))

/*
 * These are to be used when we know the size of the block and
 * we don't have a cursor.
 */
#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
	XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))

#define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
	(int)(XFS_BTREE_LBLOCK_LEN + \
	       ((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)])

/*
 * Prototypes for xfs_bmap.c to call.
 */
extern void xfs_bmdr_to_bmbt(struct xfs_mount *, xfs_bmdr_block_t *, int,
			struct xfs_btree_block *, 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(struct xfs_mount *, struct xfs_btree_block *, int,
			xfs_bmdr_block_t *, int);

extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);

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


#endif	/* __XFS_BMAP_BTREE_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000,2002-2005 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_BMAP_BTREE_H__
	19	#define __XFS_BMAP_BTREE_H__
	20
	21	#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
	22
	23	struct xfs_btree_cur;
136341b4	24	struct xfs_btree_block;
1da177e4 LT	25	struct xfs_mount;
1da177e4 LT	26	struct xfs_inode;
561f7d17	27	struct xfs_trans;
1da177e4 LT	28
	29	/*
	30	* Bmap root header, on-disk form only.
	31	*/
16259e7d CH	32	typedef struct xfs_bmdr_block {
	33	__be16 bb_level; /* 0 is a leaf */
	34	__be16 bb_numrecs; /* current # of data records */
1da177e4 LT	35	} xfs_bmdr_block_t;
	36
	37	/*
	38	* Bmap btree record and extent descriptor.
1da177e4 LT	39	* l0:63 is an extent flag (value 1 indicates non-normal).
	40	* l0:9-62 are startoff.
	41	* l0:0-8 and l1:21-63 are startblock.
	42	* l1:0-20 are blockcount.
	43	*/
1da177e4	44	#define BMBT_EXNTFLAG_BITLEN 1
1da177e4	45	#define BMBT_STARTOFF_BITLEN 54
1da177e4	46	#define BMBT_STARTBLOCK_BITLEN 52
1da177e4 LT	47	#define BMBT_BLOCKCOUNT_BITLEN 21
1da177e4 LT	48
1da177e4 LT	49
	50	#define BMBT_USE_64 1
	51
	52	typedef struct xfs_bmbt_rec_32
	53	{
	54	__uint32_t l0, l1, l2, l3;
	55	} xfs_bmbt_rec_32_t;
	56	typedef struct xfs_bmbt_rec_64
	57	{
cd8b0a97	58	__be64 l0, l1;
1da177e4 LT	59	} xfs_bmbt_rec_64_t;
	60
	61	typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
	62	typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;
	63
a6f64d4a CH	64	typedef struct xfs_bmbt_rec_host {
	65	__uint64_t l0, l1;
	66	} xfs_bmbt_rec_host_t;
	67
1da177e4 LT	68	/*
	69	* Values and macros for delayed-allocation startblock fields.
	70	*/
	71	#define STARTBLOCKVALBITS 17
	72	#define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
	73	#define DSTARTBLOCKMASKBITS (15 + 20)
	74	#define STARTBLOCKMASK \
	75	(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
	76	#define DSTARTBLOCKMASK \
	77	(((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
a844f451	78
a844f451 NS	79	static inline int isnullstartblock(xfs_fsblock_t x)
	80	{
	81	return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
	82	}
	83
a844f451 NS	84	static inline int isnulldstartblock(xfs_dfsbno_t x)
	85	{
	86	return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
	87	}
	88
a844f451 NS	89	static inline xfs_fsblock_t nullstartblock(int k)
	90	{
	91	ASSERT(k < (1 << STARTBLOCKVALBITS));
	92	return STARTBLOCKMASK \| (k);
	93	}
	94
a844f451 NS	95	static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
	96	{
	97	return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
	98	}
1da177e4 LT	99
	100	/*
	101	* Possible extent formats.
	102	*/
	103	typedef enum {
	104	XFS_EXTFMT_NOSTATE = 0,
	105	XFS_EXTFMT_HASSTATE
	106	} xfs_exntfmt_t;
	107
	108	/*
	109	* Possible extent states.
	110	*/
	111	typedef enum {
	112	XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
	113	XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
	114	} xfs_exntst_t;
	115
	116	/*
	117	* Extent state and extent format macros.
	118	*/
a844f451	119	#define XFS_EXTFMT_INODE(x) \
62118709	120	(xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
a844f451	121	XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
1da177e4 LT	122	#define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
	123
	124	/*
	125	* Incore version of above.
	126	*/
	127	typedef struct xfs_bmbt_irec
	128	{
	129	xfs_fileoff_t br_startoff; /* starting file offset */
	130	xfs_fsblock_t br_startblock; /* starting block number */
	131	xfs_filblks_t br_blockcount; /* number of blocks */
	132	xfs_exntst_t br_state; /* extent state */
	133	} xfs_bmbt_irec_t;
	134
	135	/*
	136	* Key structure for non-leaf levels of the tree.
	137	*/
8801bb99 CH	138	typedef struct xfs_bmbt_key {
8801bb99 CH	139	__be64 br_startoff; /* starting file offset */
1da177e4 LT	140	} xfs_bmbt_key_t, xfs_bmdr_key_t;
1da177e4 LT	141
397b5208 CH	142	/* btree pointer type */
	143	typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
	144
7cc95a82 CH	145	/*
	146	* Btree block header size depends on a superblock flag.
	147	*
	148	* (not quite yet, but soon)
	149	*/
	150	#define XFS_BMBT_BLOCK_LEN(mp) XFS_BTREE_LBLOCK_LEN
1da177e4	151
136341b4 CH	152	#define XFS_BMBT_REC_ADDR(mp, block, index) \
	153	((xfs_bmbt_rec_t *) \
	154	((char *)(block) + \
7cc95a82	155	XFS_BMBT_BLOCK_LEN(mp) + \
136341b4 CH	156	((index) - 1) * sizeof(xfs_bmbt_rec_t)))
	157
	158	#define XFS_BMBT_KEY_ADDR(mp, block, index) \
	159	((xfs_bmbt_key_t *) \
	160	((char *)(block) + \
7cc95a82	161	XFS_BMBT_BLOCK_LEN(mp) + \
136341b4 CH	162	((index) - 1) * sizeof(xfs_bmbt_key_t)))
	163
	164	#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
	165	((xfs_bmbt_ptr_t *) \
	166	((char *)(block) + \
7cc95a82	167	XFS_BMBT_BLOCK_LEN(mp) + \
136341b4 CH	168	(maxrecs) * sizeof(xfs_bmbt_key_t) + \
	169	((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
	170
	171	#define XFS_BMDR_REC_ADDR(block, index) \
	172	((xfs_bmdr_rec_t *) \
	173	((char *)(block) + \
	174	sizeof(struct xfs_bmdr_block) + \
	175	((index) - 1) * sizeof(xfs_bmdr_rec_t)))
	176
	177	#define XFS_BMDR_KEY_ADDR(block, index) \
	178	((xfs_bmdr_key_t *) \
	179	((char *)(block) + \
	180	sizeof(struct xfs_bmdr_block) + \
	181	((index) - 1) * sizeof(xfs_bmdr_key_t)))
	182
	183	#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
	184	((xfs_bmdr_ptr_t *) \
	185	((char *)(block) + \
	186	sizeof(struct xfs_bmdr_block) + \
	187	(maxrecs) * sizeof(xfs_bmdr_key_t) + \
	188	((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
1da177e4 LT	189
	190	/*
	191	* These are to be used when we know the size of the block and
	192	* we don't have a cursor.
	193	*/
136341b4 CH	194	#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
136341b4 CH	195	XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
1da177e4	196
1da177e4	197	#define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
7cc95a82	198	(int)(XFS_BTREE_LBLOCK_LEN + \
a844f451 NS	199	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
a844f451 NS	200
1da177e4	201	#define XFS_BMAP_BROOT_SPACE(bb) \
16259e7d	202	(XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
a844f451 NS	203	#define XFS_BMDR_SPACE_CALC(nrecs) \
	204	(int)(sizeof(xfs_bmdr_block_t) + \
	205	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
1da177e4 LT	206
	207	/*
	208	* Maximum number of bmap btree levels.
	209	*/
a844f451	210	#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
1da177e4	211
1da177e4 LT	212	/*
	213	* Prototypes for xfs_bmap.c to call.
	214	*/
60197e8d	215	extern void xfs_bmdr_to_bmbt(struct xfs_mount , xfs_bmdr_block_t , int,
7cc95a82	216	struct xfs_btree_block *, int);
a6f64d4a	217	extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t r, xfs_bmbt_irec_t s);
a6f64d4a CH	218	extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
	219	extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
	220	extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
	221	extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
1da177e4	222
a844f451	223	extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
a844f451	224	extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
a844f451	225	extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
1da177e4	226
a6f64d4a CH	227	extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t r, xfs_bmbt_irec_t s);
a6f64d4a CH	228	extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
a844f451	229	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
a6f64d4a CH	230	extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
	231	extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
	232	extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
	233	extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
1da177e4	234
a844f451 NS	235	extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
	236	extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
	237	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
1da177e4	238
7cc95a82	239	extern void xfs_bmbt_to_bmdr(struct xfs_mount , struct xfs_btree_block , int,
60197e8d CH	240	xfs_bmdr_block_t *, int);
	241
	242	extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
	243	extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
	244	extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
1da177e4	245
561f7d17 CH	246	extern struct xfs_btree_cur xfs_bmbt_init_cursor(struct xfs_mount ,
	247	struct xfs_trans , struct xfs_inode , int);
	248
1da177e4 LT	249
1da177e4 LT	250	#endif /* __XFS_BMAP_BTREE_H__ */