[net-next-2.6.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_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;

/*
 * 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_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_t *r);
extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_t *r);
extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_t *r);
extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_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_t *r, xfs_bmbt_irec_t *s);
extern void xfs_bmbt_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_set_blockcount(xfs_bmbt_rec_t *r, xfs_filblks_t v);
extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_t *r, xfs_fsblock_t v);
extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_t *r, xfs_fileoff_t v);
extern void xfs_bmbt_set_state(xfs_bmbt_rec_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__ */
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;
	24	struct xfs_btree_lblock;
	25	struct xfs_mount;
	26	struct xfs_inode;
	27
	28	/*
	29	* Bmap root header, on-disk form only.
	30	*/
16259e7d CH	31	typedef struct xfs_bmdr_block {
	32	__be16 bb_level; /* 0 is a leaf */
	33	__be16 bb_numrecs; /* current # of data records */
1da177e4 LT	34	} xfs_bmdr_block_t;
	35
	36	/*
	37	* Bmap btree record and extent descriptor.
	38	* For 32-bit kernels,
	39	* l0:31 is an extent flag (value 1 indicates non-normal).
	40	* l0:0-30 and l1:9-31 are startoff.
	41	* l1:0-8, l2:0-31, and l3:21-31 are startblock.
	42	* l3:0-20 are blockcount.
	43	* For 64-bit kernels,
	44	* l0:63 is an extent flag (value 1 indicates non-normal).
	45	* l0:9-62 are startoff.
	46	* l0:0-8 and l1:21-63 are startblock.
	47	* l1:0-20 are blockcount.
	48	*/
	49
f016bad6	50	#ifndef XFS_NATIVE_HOST
1da177e4 LT	51
	52	#define BMBT_TOTAL_BITLEN 128 /* 128 bits, 16 bytes */
	53	#define BMBT_EXNTFLAG_BITOFF 0
	54	#define BMBT_EXNTFLAG_BITLEN 1
	55	#define BMBT_STARTOFF_BITOFF (BMBT_EXNTFLAG_BITOFF + BMBT_EXNTFLAG_BITLEN)
	56	#define BMBT_STARTOFF_BITLEN 54
	57	#define BMBT_STARTBLOCK_BITOFF (BMBT_STARTOFF_BITOFF + BMBT_STARTOFF_BITLEN)
	58	#define BMBT_STARTBLOCK_BITLEN 52
	59	#define BMBT_BLOCKCOUNT_BITOFF \
	60	(BMBT_STARTBLOCK_BITOFF + BMBT_STARTBLOCK_BITLEN)
	61	#define BMBT_BLOCKCOUNT_BITLEN (BMBT_TOTAL_BITLEN - BMBT_BLOCKCOUNT_BITOFF)
	62
	63	#else
	64
	65	#define BMBT_TOTAL_BITLEN 128 /* 128 bits, 16 bytes */
	66	#define BMBT_EXNTFLAG_BITOFF 63
	67	#define BMBT_EXNTFLAG_BITLEN 1
	68	#define BMBT_STARTOFF_BITOFF (BMBT_EXNTFLAG_BITOFF - BMBT_STARTOFF_BITLEN)
	69	#define BMBT_STARTOFF_BITLEN 54
	70	#define BMBT_STARTBLOCK_BITOFF 85 /* 128 - 43 (other 9 is in first word) */
	71	#define BMBT_STARTBLOCK_BITLEN 52
	72	#define BMBT_BLOCKCOUNT_BITOFF 64 /* Start of second 64 bit container */
	73	#define BMBT_BLOCKCOUNT_BITLEN 21
	74
f016bad6	75	#endif /* XFS_NATIVE_HOST */
1da177e4 LT	76
	77
	78	#define BMBT_USE_64 1
	79
	80	typedef struct xfs_bmbt_rec_32
	81	{
	82	__uint32_t l0, l1, l2, l3;
	83	} xfs_bmbt_rec_32_t;
	84	typedef struct xfs_bmbt_rec_64
	85	{
	86	__uint64_t l0, l1;
	87	} xfs_bmbt_rec_64_t;
	88
	89	typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
	90	typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;
	91
	92	/*
	93	* Values and macros for delayed-allocation startblock fields.
	94	*/
	95	#define STARTBLOCKVALBITS 17
	96	#define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
	97	#define DSTARTBLOCKMASKBITS (15 + 20)
	98	#define STARTBLOCKMASK \
	99	(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
	100	#define DSTARTBLOCKMASK \
	101	(((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
a844f451	102
1da177e4	103	#define ISNULLSTARTBLOCK(x) isnullstartblock(x)
a844f451 NS	104	static inline int isnullstartblock(xfs_fsblock_t x)
	105	{
	106	return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
	107	}
	108
1da177e4	109	#define ISNULLDSTARTBLOCK(x) isnulldstartblock(x)
a844f451 NS	110	static inline int isnulldstartblock(xfs_dfsbno_t x)
	111	{
	112	return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
	113	}
	114
1da177e4	115	#define NULLSTARTBLOCK(k) nullstartblock(k)
a844f451 NS	116	static inline xfs_fsblock_t nullstartblock(int k)
	117	{
	118	ASSERT(k < (1 << STARTBLOCKVALBITS));
	119	return STARTBLOCKMASK \| (k);
	120	}
	121
1da177e4	122	#define STARTBLOCKVAL(x) startblockval(x)
a844f451 NS	123	static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
	124	{
	125	return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
	126	}
1da177e4 LT	127
	128	/*
	129	* Possible extent formats.
	130	*/
	131	typedef enum {
	132	XFS_EXTFMT_NOSTATE = 0,
	133	XFS_EXTFMT_HASSTATE
	134	} xfs_exntfmt_t;
	135
	136	/*
	137	* Possible extent states.
	138	*/
	139	typedef enum {
	140	XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
	141	XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
	142	} xfs_exntst_t;
	143
	144	/*
	145	* Extent state and extent format macros.
	146	*/
a844f451 NS	147	#define XFS_EXTFMT_INODE(x) \
	148	(XFS_SB_VERSION_HASEXTFLGBIT(&((x)->i_mount->m_sb)) ? \
	149	XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
1da177e4 LT	150	#define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
	151
	152	/*
	153	* Incore version of above.
	154	*/
	155	typedef struct xfs_bmbt_irec
	156	{
	157	xfs_fileoff_t br_startoff; /* starting file offset */
	158	xfs_fsblock_t br_startblock; /* starting block number */
	159	xfs_filblks_t br_blockcount; /* number of blocks */
	160	xfs_exntst_t br_state; /* extent state */
	161	} xfs_bmbt_irec_t;
	162
	163	/*
	164	* Key structure for non-leaf levels of the tree.
	165	*/
8801bb99 CH	166	typedef struct xfs_bmbt_key {
8801bb99 CH	167	__be64 br_startoff; /* starting file offset */
1da177e4 LT	168	} xfs_bmbt_key_t, xfs_bmdr_key_t;
1da177e4 LT	169
397b5208 CH	170	/* btree pointer type */
	171	typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
	172
	173	/* btree block header type */
1da177e4 LT	174	typedef struct xfs_btree_lblock xfs_bmbt_block_t;
1da177e4 LT	175
a844f451	176	#define XFS_BUF_TO_BMBT_BLOCK(bp) ((xfs_bmbt_block_t *)XFS_BUF_PTR(bp))
1da177e4	177
a844f451 NS	178	#define XFS_BMAP_RBLOCK_DSIZE(lev,cur) ((cur)->bc_private.b.forksize)
a844f451 NS	179	#define XFS_BMAP_RBLOCK_ISIZE(lev,cur) \
1da177e4	180	((int)XFS_IFORK_PTR((cur)->bc_private.b.ip, \
a844f451	181	(cur)->bc_private.b.whichfork)->if_broot_bytes)
1da177e4	182
1da177e4	183	#define XFS_BMAP_BLOCK_DMAXRECS(lev,cur) \
a844f451	184	(((lev) == (cur)->bc_nlevels - 1 ? \
1da177e4 LT	185	XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur), \
1da177e4 LT	186	xfs_bmdr, (lev) == 0) : \
a844f451	187	((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
1da177e4	188	#define XFS_BMAP_BLOCK_IMAXRECS(lev,cur) \
a844f451 NS	189	(((lev) == (cur)->bc_nlevels - 1 ? \
	190	XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
	191	xfs_bmbt, (lev) == 0) : \
	192	((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
1da177e4	193
1da177e4	194	#define XFS_BMAP_BLOCK_DMINRECS(lev,cur) \
a844f451 NS	195	(((lev) == (cur)->bc_nlevels - 1 ? \
	196	XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur),\
	197	xfs_bmdr, (lev) == 0) : \
	198	((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
1da177e4	199	#define XFS_BMAP_BLOCK_IMINRECS(lev,cur) \
a844f451 NS	200	(((lev) == (cur)->bc_nlevels - 1 ? \
	201	XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
	202	xfs_bmbt, (lev) == 0) : \
	203	((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
	204
2c36dded ES	205	#define XFS_BMAP_REC_DADDR(bb,i,cur) (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))
	206
	207	#define XFS_BMAP_REC_IADDR(bb,i,cur) (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))
a844f451 NS	208
a844f451 NS	209	#define XFS_BMAP_KEY_DADDR(bb,i,cur) \
2c36dded ES	210	(XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))
2c36dded ES	211
a844f451	212	#define XFS_BMAP_KEY_IADDR(bb,i,cur) \
2c36dded	213	(XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))
a844f451 NS	214
a844f451 NS	215	#define XFS_BMAP_PTR_DADDR(bb,i,cur) \
2c36dded	216	(XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS( \
16259e7d	217	be16_to_cpu((bb)->bb_level), cur)))
a844f451	218	#define XFS_BMAP_PTR_IADDR(bb,i,cur) \
2c36dded	219	(XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS( \
16259e7d	220	be16_to_cpu((bb)->bb_level), cur)))
1da177e4 LT	221
	222	/*
	223	* These are to be used when we know the size of the block and
	224	* we don't have a cursor.
	225	*/
1da177e4	226	#define XFS_BMAP_BROOT_REC_ADDR(bb,i,sz) \
2c36dded	227	(XFS_BTREE_REC_ADDR(xfs_bmbt,bb,i))
1da177e4	228	#define XFS_BMAP_BROOT_KEY_ADDR(bb,i,sz) \
2c36dded	229	(XFS_BTREE_KEY_ADDR(xfs_bmbt,bb,i))
1da177e4	230	#define XFS_BMAP_BROOT_PTR_ADDR(bb,i,sz) \
2c36dded	231	(XFS_BTREE_PTR_ADDR(xfs_bmbt,bb,i,XFS_BMAP_BROOT_MAXRECS(sz)))
a844f451	232
16259e7d	233	#define XFS_BMAP_BROOT_NUMRECS(bb) be16_to_cpu((bb)->bb_numrecs)
a844f451	234	#define XFS_BMAP_BROOT_MAXRECS(sz) XFS_BTREE_BLOCK_MAXRECS(sz,xfs_bmbt,0)
1da177e4	235
1da177e4	236	#define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
a844f451 NS	237	(int)(sizeof(xfs_bmbt_block_t) + \
	238	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
	239
1da177e4	240	#define XFS_BMAP_BROOT_SPACE(bb) \
16259e7d	241	(XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
a844f451 NS	242	#define XFS_BMDR_SPACE_CALC(nrecs) \
	243	(int)(sizeof(xfs_bmdr_block_t) + \
	244	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
1da177e4 LT	245
	246	/*
	247	* Maximum number of bmap btree levels.
	248	*/
a844f451	249	#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
1da177e4	250
a844f451	251	#define XFS_BMAP_SANITY_CHECK(mp,bb,level) \
16259e7d CH	252	(be32_to_cpu((bb)->bb_magic) == XFS_BMAP_MAGIC && \
	253	be16_to_cpu((bb)->bb_level) == level && \
	254	be16_to_cpu((bb)->bb_numrecs) > 0 && \
	255	be16_to_cpu((bb)->bb_numrecs) <= (mp)->m_bmap_dmxr[(level) != 0])
1da177e4 LT	256
	257
	258	#ifdef __KERNEL__
	259
	260	#if defined(XFS_BMBT_TRACE)
	261	/*
	262	* Trace buffer entry types.
	263	*/
	264	#define XFS_BMBT_KTRACE_ARGBI 1
	265	#define XFS_BMBT_KTRACE_ARGBII 2
	266	#define XFS_BMBT_KTRACE_ARGFFFI 3
	267	#define XFS_BMBT_KTRACE_ARGI 4
	268	#define XFS_BMBT_KTRACE_ARGIFK 5
	269	#define XFS_BMBT_KTRACE_ARGIFR 6
	270	#define XFS_BMBT_KTRACE_ARGIK 7
	271	#define XFS_BMBT_KTRACE_CUR 8
	272
	273	#define XFS_BMBT_TRACE_SIZE 4096 /* size of global trace buffer */
	274	#define XFS_BMBT_KTRACE_SIZE 32 /* size of per-inode trace buffer */
	275	extern ktrace_t *xfs_bmbt_trace_buf;
	276	#endif
	277
	278	/*
	279	* Prototypes for xfs_bmap.c to call.
	280	*/
a844f451 NS	281	extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t , int, xfs_bmbt_block_t , int);
	282	extern int xfs_bmbt_decrement(struct xfs_btree_cur , int, int );
	283	extern int xfs_bmbt_delete(struct xfs_btree_cur , int );
	284	extern void xfs_bmbt_get_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
	285	extern xfs_bmbt_block_t xfs_bmbt_get_block(struct xfs_btree_cur cur,
	286	int, struct xfs_buf **bpp);
	287	extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_t *r);
	288	extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_t *r);
	289	extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_t *r);
	290	extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_t *r);
1da177e4	291
f016bad6	292	#ifndef XFS_NATIVE_HOST
a844f451	293	extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
a844f451	294	extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
a844f451 NS	295	extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
	296	#else
	297	#define xfs_bmbt_disk_get_all(r, s) xfs_bmbt_get_all(r, s)
a844f451	298	#define xfs_bmbt_disk_get_blockcount(r) xfs_bmbt_get_blockcount(r)
a844f451	299	#define xfs_bmbt_disk_get_startoff(r) xfs_bmbt_get_startoff(r)
f016bad6	300	#endif /* XFS_NATIVE_HOST */
1da177e4	301
a844f451 NS	302	extern int xfs_bmbt_increment(struct xfs_btree_cur , int, int );
	303	extern int xfs_bmbt_insert(struct xfs_btree_cur , int );
	304	extern void xfs_bmbt_log_block(struct xfs_btree_cur , struct xfs_buf , int);
	305	extern void xfs_bmbt_log_recs(struct xfs_btree_cur , struct xfs_buf , int,
	306	int);
	307	extern int xfs_bmbt_lookup_eq(struct xfs_btree_cur *, xfs_fileoff_t,
	308	xfs_fsblock_t, xfs_filblks_t, int *);
	309	extern int xfs_bmbt_lookup_ge(struct xfs_btree_cur *, xfs_fileoff_t,
	310	xfs_fsblock_t, xfs_filblks_t, int *);
1da177e4	311
1da177e4 LT	312	/*
	313	* Give the bmap btree a new root block. Copy the old broot contents
	314	* down into a real block and make the broot point to it.
	315	*/
a844f451 NS	316	extern int xfs_bmbt_newroot(struct xfs_btree_cur cur, int lflags, int *stat);
	317
	318	extern void xfs_bmbt_set_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
	319	extern void xfs_bmbt_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
	320	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
	321	extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_t *r, xfs_filblks_t v);
	322	extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_t *r, xfs_fsblock_t v);
	323	extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_t *r, xfs_fileoff_t v);
	324	extern void xfs_bmbt_set_state(xfs_bmbt_rec_t *r, xfs_exntst_t v);
1da177e4	325
f016bad6	326	#ifndef XFS_NATIVE_HOST
a844f451 NS	327	extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
	328	extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
	329	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
1da177e4	330	#else
a844f451 NS	331	#define xfs_bmbt_disk_set_all(r, s) xfs_bmbt_set_all(r, s)
a844f451 NS	332	#define xfs_bmbt_disk_set_allf(r, o, b, c, v) xfs_bmbt_set_allf(r, o, b, c, v)
f016bad6	333	#endif /* XFS_NATIVE_HOST */
1da177e4	334
a844f451 NS	335	extern void xfs_bmbt_to_bmdr(xfs_bmbt_block_t , int, xfs_bmdr_block_t , int);
	336	extern int xfs_bmbt_update(struct xfs_btree_cur *, xfs_fileoff_t,
	337	xfs_fsblock_t, xfs_filblks_t, xfs_exntst_t);
1da177e4	338
1da177e4 LT	339	#endif /* __KERNEL__ */
	340
	341	#endif /* __XFS_BMAP_BTREE_H__ */