[GitHub/mt8127/android_kernel_alcatel_ttab.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' */
#define XFS_BMAP_CRC_MAGIC	0x424d4133	/* 'BMA3' */

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

typedef struct xfs_bmbt_rec {
	__be64			l0, l1;
} xfs_bmbt_rec_t;

typedef __uint64_t	xfs_bmbt_rec_base_t;	/* use this for casts */
typedef 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.
 */
#define XFS_BMBT_BLOCK_LEN(mp) \
	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
		XFS_BTREE_LBLOCK_CRC_LEN : 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(mp, nrecs) \
	(int)(XFS_BMBT_BLOCK_LEN(mp) + \
	       ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))

#define XFS_BMAP_BROOT_SPACE(mp, bb) \
	(XFS_BMAP_BROOT_SPACE_CALC(mp, 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_inode *, 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 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_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);

extern const struct xfs_buf_ops xfs_bmbt_buf_ops;

#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
ee1a47ab CH	21	#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
ee1a47ab CH	22	#define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
1da177e4 LT	23
1da177e4 LT	24	struct xfs_btree_cur;
136341b4	25	struct xfs_btree_block;
1da177e4 LT	26	struct xfs_mount;
1da177e4 LT	27	struct xfs_inode;
561f7d17	28	struct xfs_trans;
1da177e4 LT	29
	30	/*
	31	* Bmap root header, on-disk form only.
	32	*/
16259e7d CH	33	typedef struct xfs_bmdr_block {
	34	__be16 bb_level; /* 0 is a leaf */
	35	__be16 bb_numrecs; /* current # of data records */
1da177e4 LT	36	} xfs_bmdr_block_t;
	37
	38	/*
	39	* Bmap btree record and extent descriptor.
1da177e4 LT	40	* l0:63 is an extent flag (value 1 indicates non-normal).
	41	* l0:9-62 are startoff.
	42	* l0:0-8 and l1:21-63 are startblock.
	43	* l1:0-20 are blockcount.
	44	*/
1da177e4	45	#define BMBT_EXNTFLAG_BITLEN 1
1da177e4	46	#define BMBT_STARTOFF_BITLEN 54
1da177e4	47	#define BMBT_STARTBLOCK_BITLEN 52
1da177e4 LT	48	#define BMBT_BLOCKCOUNT_BITLEN 21
1da177e4 LT	49
a5f9be58	50	typedef struct xfs_bmbt_rec {
cd8b0a97	51	__be64 l0, l1;
a5f9be58	52	} xfs_bmbt_rec_t;
1da177e4 LT	53
1da177e4 LT	54	typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
a5f9be58	55	typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
1da177e4	56
a6f64d4a CH	57	typedef struct xfs_bmbt_rec_host {
	58	__uint64_t l0, l1;
	59	} xfs_bmbt_rec_host_t;
	60
1da177e4 LT	61	/*
	62	* Values and macros for delayed-allocation startblock fields.
	63	*/
	64	#define STARTBLOCKVALBITS 17
	65	#define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
	66	#define DSTARTBLOCKMASKBITS (15 + 20)
	67	#define STARTBLOCKMASK \
	68	(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
	69	#define DSTARTBLOCKMASK \
	70	(((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
a844f451	71
a844f451 NS	72	static inline int isnullstartblock(xfs_fsblock_t x)
	73	{
	74	return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
	75	}
	76
a844f451 NS	77	static inline int isnulldstartblock(xfs_dfsbno_t x)
	78	{
	79	return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
	80	}
	81
a844f451 NS	82	static inline xfs_fsblock_t nullstartblock(int k)
	83	{
	84	ASSERT(k < (1 << STARTBLOCKVALBITS));
	85	return STARTBLOCKMASK \| (k);
	86	}
	87
a844f451 NS	88	static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
	89	{
	90	return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
	91	}
1da177e4 LT	92
	93	/*
	94	* Possible extent formats.
	95	*/
	96	typedef enum {
	97	XFS_EXTFMT_NOSTATE = 0,
	98	XFS_EXTFMT_HASSTATE
	99	} xfs_exntfmt_t;
	100
	101	/*
	102	* Possible extent states.
	103	*/
	104	typedef enum {
	105	XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
	106	XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
	107	} xfs_exntst_t;
	108
	109	/*
	110	* Extent state and extent format macros.
	111	*/
a844f451	112	#define XFS_EXTFMT_INODE(x) \
62118709	113	(xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
a844f451	114	XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
1da177e4 LT	115	#define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
	116
	117	/*
	118	* Incore version of above.
	119	*/
	120	typedef struct xfs_bmbt_irec
	121	{
	122	xfs_fileoff_t br_startoff; /* starting file offset */
	123	xfs_fsblock_t br_startblock; /* starting block number */
	124	xfs_filblks_t br_blockcount; /* number of blocks */
	125	xfs_exntst_t br_state; /* extent state */
	126	} xfs_bmbt_irec_t;
	127
	128	/*
	129	* Key structure for non-leaf levels of the tree.
	130	*/
8801bb99 CH	131	typedef struct xfs_bmbt_key {
8801bb99 CH	132	__be64 br_startoff; /* starting file offset */
1da177e4 LT	133	} xfs_bmbt_key_t, xfs_bmdr_key_t;
1da177e4 LT	134
397b5208 CH	135	/* btree pointer type */
	136	typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
	137
7cc95a82 CH	138	/*
7cc95a82 CH	139	* Btree block header size depends on a superblock flag.
7cc95a82	140	*/
ee1a47ab CH	141	#define XFS_BMBT_BLOCK_LEN(mp) \
	142	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
	143	XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN)
1da177e4	144
136341b4 CH	145	#define XFS_BMBT_REC_ADDR(mp, block, index) \
	146	((xfs_bmbt_rec_t *) \
	147	((char *)(block) + \
7cc95a82	148	XFS_BMBT_BLOCK_LEN(mp) + \
136341b4 CH	149	((index) - 1) * sizeof(xfs_bmbt_rec_t)))
	150
	151	#define XFS_BMBT_KEY_ADDR(mp, block, index) \
	152	((xfs_bmbt_key_t *) \
	153	((char *)(block) + \
7cc95a82	154	XFS_BMBT_BLOCK_LEN(mp) + \
136341b4 CH	155	((index) - 1) * sizeof(xfs_bmbt_key_t)))
	156
	157	#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
	158	((xfs_bmbt_ptr_t *) \
	159	((char *)(block) + \
7cc95a82	160	XFS_BMBT_BLOCK_LEN(mp) + \
136341b4 CH	161	(maxrecs) * sizeof(xfs_bmbt_key_t) + \
	162	((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
	163
	164	#define XFS_BMDR_REC_ADDR(block, index) \
	165	((xfs_bmdr_rec_t *) \
	166	((char *)(block) + \
	167	sizeof(struct xfs_bmdr_block) + \
	168	((index) - 1) * sizeof(xfs_bmdr_rec_t)))
	169
	170	#define XFS_BMDR_KEY_ADDR(block, index) \
	171	((xfs_bmdr_key_t *) \
	172	((char *)(block) + \
	173	sizeof(struct xfs_bmdr_block) + \
	174	((index) - 1) * sizeof(xfs_bmdr_key_t)))
	175
	176	#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
	177	((xfs_bmdr_ptr_t *) \
	178	((char *)(block) + \
	179	sizeof(struct xfs_bmdr_block) + \
	180	(maxrecs) * sizeof(xfs_bmdr_key_t) + \
	181	((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
1da177e4 LT	182
	183	/*
	184	* These are to be used when we know the size of the block and
	185	* we don't have a cursor.
	186	*/
136341b4 CH	187	#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
136341b4 CH	188	XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
1da177e4	189
ee1a47ab CH	190	#define XFS_BMAP_BROOT_SPACE_CALC(mp, nrecs) \
ee1a47ab CH	191	(int)(XFS_BMBT_BLOCK_LEN(mp) + \
a844f451 NS	192	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
a844f451 NS	193
ee1a47ab CH	194	#define XFS_BMAP_BROOT_SPACE(mp, bb) \
ee1a47ab CH	195	(XFS_BMAP_BROOT_SPACE_CALC(mp, be16_to_cpu((bb)->bb_numrecs)))
a844f451 NS	196	#define XFS_BMDR_SPACE_CALC(nrecs) \
	197	(int)(sizeof(xfs_bmdr_block_t) + \
	198	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
1da177e4 LT	199
	200	/*
	201	* Maximum number of bmap btree levels.
	202	*/
a844f451	203	#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
1da177e4	204
1da177e4 LT	205	/*
	206	* Prototypes for xfs_bmap.c to call.
	207	*/
ee1a47ab	208	extern void xfs_bmdr_to_bmbt(struct xfs_inode , xfs_bmdr_block_t , int,
7cc95a82	209	struct xfs_btree_block *, int);
a6f64d4a	210	extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t r, xfs_bmbt_irec_t s);
a6f64d4a CH	211	extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
	212	extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
	213	extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
	214	extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
1da177e4	215
a844f451	216	extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
a844f451	217	extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
1da177e4	218
a6f64d4a CH	219	extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t r, xfs_bmbt_irec_t s);
a6f64d4a CH	220	extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
a844f451	221	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
a6f64d4a CH	222	extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
	223	extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
	224	extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
	225	extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
1da177e4	226
a844f451 NS	227	extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
a844f451 NS	228	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
1da177e4	229
7cc95a82	230	extern void xfs_bmbt_to_bmdr(struct xfs_mount , struct xfs_btree_block , int,
60197e8d CH	231	xfs_bmdr_block_t *, int);
	232
	233	extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
	234	extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
	235	extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
1da177e4	236
561f7d17 CH	237	extern struct xfs_btree_cur xfs_bmbt_init_cursor(struct xfs_mount ,
	238	struct xfs_trans , struct xfs_inode , int);
	239
1813dd64	240	extern const struct xfs_buf_ops xfs_bmbt_buf_ops;
1da177e4 LT	241
1da177e4 LT	242	#endif /* __XFS_BMAP_BTREE_H__ */