[linux-2.6-block.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;

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__ */
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
a6f64d4a CH	92	typedef struct xfs_bmbt_rec_host {
	93	__uint64_t l0, l1;
	94	} xfs_bmbt_rec_host_t;
	95
1da177e4 LT	96	/*
	97	* Values and macros for delayed-allocation startblock fields.
	98	*/
	99	#define STARTBLOCKVALBITS 17
	100	#define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
	101	#define DSTARTBLOCKMASKBITS (15 + 20)
	102	#define STARTBLOCKMASK \
	103	(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
	104	#define DSTARTBLOCKMASK \
	105	(((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
a844f451	106
1da177e4	107	#define ISNULLSTARTBLOCK(x) isnullstartblock(x)
a844f451 NS	108	static inline int isnullstartblock(xfs_fsblock_t x)
	109	{
	110	return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
	111	}
	112
1da177e4	113	#define ISNULLDSTARTBLOCK(x) isnulldstartblock(x)
a844f451 NS	114	static inline int isnulldstartblock(xfs_dfsbno_t x)
	115	{
	116	return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
	117	}
	118
1da177e4	119	#define NULLSTARTBLOCK(k) nullstartblock(k)
a844f451 NS	120	static inline xfs_fsblock_t nullstartblock(int k)
	121	{
	122	ASSERT(k < (1 << STARTBLOCKVALBITS));
	123	return STARTBLOCKMASK \| (k);
	124	}
	125
1da177e4	126	#define STARTBLOCKVAL(x) startblockval(x)
a844f451 NS	127	static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
	128	{
	129	return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
	130	}
1da177e4 LT	131
	132	/*
	133	* Possible extent formats.
	134	*/
	135	typedef enum {
	136	XFS_EXTFMT_NOSTATE = 0,
	137	XFS_EXTFMT_HASSTATE
	138	} xfs_exntfmt_t;
	139
	140	/*
	141	* Possible extent states.
	142	*/
	143	typedef enum {
	144	XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
	145	XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
	146	} xfs_exntst_t;
	147
	148	/*
	149	* Extent state and extent format macros.
	150	*/
a844f451 NS	151	#define XFS_EXTFMT_INODE(x) \
	152	(XFS_SB_VERSION_HASEXTFLGBIT(&((x)->i_mount->m_sb)) ? \
	153	XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
1da177e4 LT	154	#define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
	155
	156	/*
	157	* Incore version of above.
	158	*/
	159	typedef struct xfs_bmbt_irec
	160	{
	161	xfs_fileoff_t br_startoff; /* starting file offset */
	162	xfs_fsblock_t br_startblock; /* starting block number */
	163	xfs_filblks_t br_blockcount; /* number of blocks */
	164	xfs_exntst_t br_state; /* extent state */
	165	} xfs_bmbt_irec_t;
	166
	167	/*
	168	* Key structure for non-leaf levels of the tree.
	169	*/
8801bb99 CH	170	typedef struct xfs_bmbt_key {
8801bb99 CH	171	__be64 br_startoff; /* starting file offset */
1da177e4 LT	172	} xfs_bmbt_key_t, xfs_bmdr_key_t;
1da177e4 LT	173
397b5208 CH	174	/* btree pointer type */
	175	typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
	176
	177	/* btree block header type */
1da177e4 LT	178	typedef struct xfs_btree_lblock xfs_bmbt_block_t;
1da177e4 LT	179
a844f451	180	#define XFS_BUF_TO_BMBT_BLOCK(bp) ((xfs_bmbt_block_t *)XFS_BUF_PTR(bp))
1da177e4	181
a844f451 NS	182	#define XFS_BMAP_RBLOCK_DSIZE(lev,cur) ((cur)->bc_private.b.forksize)
a844f451 NS	183	#define XFS_BMAP_RBLOCK_ISIZE(lev,cur) \
1da177e4	184	((int)XFS_IFORK_PTR((cur)->bc_private.b.ip, \
a844f451	185	(cur)->bc_private.b.whichfork)->if_broot_bytes)
1da177e4	186
1da177e4	187	#define XFS_BMAP_BLOCK_DMAXRECS(lev,cur) \
a844f451	188	(((lev) == (cur)->bc_nlevels - 1 ? \
1da177e4 LT	189	XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur), \
1da177e4 LT	190	xfs_bmdr, (lev) == 0) : \
a844f451	191	((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
1da177e4	192	#define XFS_BMAP_BLOCK_IMAXRECS(lev,cur) \
a844f451 NS	193	(((lev) == (cur)->bc_nlevels - 1 ? \
	194	XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
	195	xfs_bmbt, (lev) == 0) : \
	196	((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
1da177e4	197
1da177e4	198	#define XFS_BMAP_BLOCK_DMINRECS(lev,cur) \
a844f451 NS	199	(((lev) == (cur)->bc_nlevels - 1 ? \
	200	XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur),\
	201	xfs_bmdr, (lev) == 0) : \
	202	((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
1da177e4	203	#define XFS_BMAP_BLOCK_IMINRECS(lev,cur) \
a844f451 NS	204	(((lev) == (cur)->bc_nlevels - 1 ? \
	205	XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
	206	xfs_bmbt, (lev) == 0) : \
	207	((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
	208
2c36dded ES	209	#define XFS_BMAP_REC_DADDR(bb,i,cur) (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))
	210
	211	#define XFS_BMAP_REC_IADDR(bb,i,cur) (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))
a844f451 NS	212
a844f451 NS	213	#define XFS_BMAP_KEY_DADDR(bb,i,cur) \
2c36dded ES	214	(XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))
2c36dded ES	215
a844f451	216	#define XFS_BMAP_KEY_IADDR(bb,i,cur) \
2c36dded	217	(XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))
a844f451 NS	218
a844f451 NS	219	#define XFS_BMAP_PTR_DADDR(bb,i,cur) \
2c36dded	220	(XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS( \
16259e7d	221	be16_to_cpu((bb)->bb_level), cur)))
a844f451	222	#define XFS_BMAP_PTR_IADDR(bb,i,cur) \
2c36dded	223	(XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS( \
16259e7d	224	be16_to_cpu((bb)->bb_level), cur)))
1da177e4 LT	225
	226	/*
	227	* These are to be used when we know the size of the block and
	228	* we don't have a cursor.
	229	*/
1da177e4	230	#define XFS_BMAP_BROOT_REC_ADDR(bb,i,sz) \
2c36dded	231	(XFS_BTREE_REC_ADDR(xfs_bmbt,bb,i))
1da177e4	232	#define XFS_BMAP_BROOT_KEY_ADDR(bb,i,sz) \
2c36dded	233	(XFS_BTREE_KEY_ADDR(xfs_bmbt,bb,i))
1da177e4	234	#define XFS_BMAP_BROOT_PTR_ADDR(bb,i,sz) \
2c36dded	235	(XFS_BTREE_PTR_ADDR(xfs_bmbt,bb,i,XFS_BMAP_BROOT_MAXRECS(sz)))
a844f451	236
16259e7d	237	#define XFS_BMAP_BROOT_NUMRECS(bb) be16_to_cpu((bb)->bb_numrecs)
a844f451	238	#define XFS_BMAP_BROOT_MAXRECS(sz) XFS_BTREE_BLOCK_MAXRECS(sz,xfs_bmbt,0)
1da177e4	239
1da177e4	240	#define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
a844f451 NS	241	(int)(sizeof(xfs_bmbt_block_t) + \
	242	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
	243
1da177e4	244	#define XFS_BMAP_BROOT_SPACE(bb) \
16259e7d	245	(XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
a844f451 NS	246	#define XFS_BMDR_SPACE_CALC(nrecs) \
	247	(int)(sizeof(xfs_bmdr_block_t) + \
	248	((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
1da177e4 LT	249
	250	/*
	251	* Maximum number of bmap btree levels.
	252	*/
a844f451	253	#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
1da177e4	254
a844f451	255	#define XFS_BMAP_SANITY_CHECK(mp,bb,level) \
16259e7d CH	256	(be32_to_cpu((bb)->bb_magic) == XFS_BMAP_MAGIC && \
	257	be16_to_cpu((bb)->bb_level) == level && \
	258	be16_to_cpu((bb)->bb_numrecs) > 0 && \
	259	be16_to_cpu((bb)->bb_numrecs) <= (mp)->m_bmap_dmxr[(level) != 0])
1da177e4 LT	260
	261
	262	#ifdef __KERNEL__
	263
	264	#if defined(XFS_BMBT_TRACE)
	265	/*
	266	* Trace buffer entry types.
	267	*/
	268	#define XFS_BMBT_KTRACE_ARGBI 1
	269	#define XFS_BMBT_KTRACE_ARGBII 2
	270	#define XFS_BMBT_KTRACE_ARGFFFI 3
	271	#define XFS_BMBT_KTRACE_ARGI 4
	272	#define XFS_BMBT_KTRACE_ARGIFK 5
	273	#define XFS_BMBT_KTRACE_ARGIFR 6
	274	#define XFS_BMBT_KTRACE_ARGIK 7
	275	#define XFS_BMBT_KTRACE_CUR 8
	276
	277	#define XFS_BMBT_TRACE_SIZE 4096 /* size of global trace buffer */
	278	#define XFS_BMBT_KTRACE_SIZE 32 /* size of per-inode trace buffer */
	279	extern ktrace_t *xfs_bmbt_trace_buf;
	280	#endif
	281
	282	/*
	283	* Prototypes for xfs_bmap.c to call.
	284	*/
a844f451 NS	285	extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t , int, xfs_bmbt_block_t , int);
	286	extern int xfs_bmbt_decrement(struct xfs_btree_cur , int, int );
	287	extern int xfs_bmbt_delete(struct xfs_btree_cur , int );
a6f64d4a	288	extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t r, xfs_bmbt_irec_t s);
a844f451 NS	289	extern xfs_bmbt_block_t xfs_bmbt_get_block(struct xfs_btree_cur cur,
a844f451 NS	290	int, struct xfs_buf **bpp);
a6f64d4a CH	291	extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
	292	extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
	293	extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
	294	extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
1da177e4	295
f016bad6	296	#ifndef XFS_NATIVE_HOST
a844f451	297	extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
a844f451	298	extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
a844f451 NS	299	extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
	300	#else
	301	#define xfs_bmbt_disk_get_all(r, s) xfs_bmbt_get_all(r, s)
a844f451	302	#define xfs_bmbt_disk_get_blockcount(r) xfs_bmbt_get_blockcount(r)
a844f451	303	#define xfs_bmbt_disk_get_startoff(r) xfs_bmbt_get_startoff(r)
f016bad6	304	#endif /* XFS_NATIVE_HOST */
1da177e4	305
a844f451 NS	306	extern int xfs_bmbt_increment(struct xfs_btree_cur , int, int );
	307	extern int xfs_bmbt_insert(struct xfs_btree_cur , int );
	308	extern void xfs_bmbt_log_block(struct xfs_btree_cur , struct xfs_buf , int);
	309	extern void xfs_bmbt_log_recs(struct xfs_btree_cur , struct xfs_buf , int,
	310	int);
	311	extern int xfs_bmbt_lookup_eq(struct xfs_btree_cur *, xfs_fileoff_t,
	312	xfs_fsblock_t, xfs_filblks_t, int *);
	313	extern int xfs_bmbt_lookup_ge(struct xfs_btree_cur *, xfs_fileoff_t,
	314	xfs_fsblock_t, xfs_filblks_t, int *);
1da177e4	315
1da177e4 LT	316	/*
	317	* Give the bmap btree a new root block. Copy the old broot contents
	318	* down into a real block and make the broot point to it.
	319	*/
a844f451 NS	320	extern int xfs_bmbt_newroot(struct xfs_btree_cur cur, int lflags, int *stat);
a844f451 NS	321
a6f64d4a CH	322	extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t r, xfs_bmbt_irec_t s);
a6f64d4a CH	323	extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
a844f451	324	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
a6f64d4a CH	325	extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
	326	extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
	327	extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
	328	extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
1da177e4	329
f016bad6	330	#ifndef XFS_NATIVE_HOST
a844f451 NS	331	extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t r, xfs_bmbt_irec_t s);
	332	extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
	333	xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
1da177e4	334	#else
a844f451 NS	335	#define xfs_bmbt_disk_set_all(r, s) xfs_bmbt_set_all(r, s)
a844f451 NS	336	#define xfs_bmbt_disk_set_allf(r, o, b, c, v) xfs_bmbt_set_allf(r, o, b, c, v)
f016bad6	337	#endif /* XFS_NATIVE_HOST */
1da177e4	338
a844f451 NS	339	extern void xfs_bmbt_to_bmdr(xfs_bmbt_block_t , int, xfs_bmdr_block_t , int);
	340	extern int xfs_bmbt_update(struct xfs_btree_cur *, xfs_fileoff_t,
	341	xfs_fsblock_t, xfs_filblks_t, xfs_exntst_t);
1da177e4	342
1da177e4 LT	343	#endif /* __KERNEL__ */
	344
	345	#endif /* __XFS_BMAP_BTREE_H__ */