xfs_bmap_btree.h

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/*
 * Copyright (c) 2000,2002-2004 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.	 Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#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
{
	__uint16_t	bb_level;	/* 0 is a leaf */
	__uint16_t	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.
 */

#if __BYTE_ORDER == __LITTLE_ENDIAN

#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


#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)
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_ISNULLSTARTBLOCK)
int isnullstartblock(xfs_fsblock_t x);
#define ISNULLSTARTBLOCK(x)	isnullstartblock(x)
#else
#define ISNULLSTARTBLOCK(x)	(((x) & STARTBLOCKMASK) == STARTBLOCKMASK)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_ISNULLDSTARTBLOCK)
int isnulldstartblock(xfs_dfsbno_t x);
#define ISNULLDSTARTBLOCK(x)	isnulldstartblock(x)
#else
#define ISNULLDSTARTBLOCK(x)	(((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_NULLSTARTBLOCK)
xfs_fsblock_t nullstartblock(int k);
#define NULLSTARTBLOCK(k)	nullstartblock(k)
#else
#define NULLSTARTBLOCK(k)	\
	((ASSERT(k < (1 << STARTBLOCKVALBITS))), (STARTBLOCKMASK | (k)))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_STARTBLOCKVAL)
xfs_filblks_t startblockval(xfs_fsblock_t x);
#define STARTBLOCKVAL(x)	startblockval(x)
#else
#define STARTBLOCKVAL(x)	((xfs_filblks_t)((x) & ~STARTBLOCKMASK))
#endif

/*
 * 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.
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_EXTFMT_INODE )
xfs_exntfmt_t xfs_extfmt_inode(struct xfs_inode *ip);
#define XFS_EXTFMT_INODE(x)	xfs_extfmt_inode(x)
#else
#define XFS_EXTFMT_INODE(x) \
  (XFS_SB_VERSION_HASEXTFLGBIT(&((x)->i_mount->m_sb)) ? \
	XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
#endif
#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
{
	xfs_dfiloff_t	br_startoff;	/* starting file offset */
} xfs_bmbt_key_t, xfs_bmdr_key_t;

typedef xfs_dfsbno_t xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;	/* btree pointer type */
					/* btree block header type */
typedef struct xfs_btree_lblock xfs_bmbt_block_t;

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_BMBT_BLOCK)
xfs_bmbt_block_t *xfs_buf_to_bmbt_block(struct xfs_buf *bp);
#define XFS_BUF_TO_BMBT_BLOCK(bp)		xfs_buf_to_bmbt_block(bp)
#else
#define XFS_BUF_TO_BMBT_BLOCK(bp) ((xfs_bmbt_block_t *)(XFS_BUF_PTR(bp)))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_RBLOCK_DSIZE)
int xfs_bmap_rblock_dsize(int lev, struct xfs_btree_cur *cur);
#define XFS_BMAP_RBLOCK_DSIZE(lev,cur)		xfs_bmap_rblock_dsize(lev,cur)
#else
#define XFS_BMAP_RBLOCK_DSIZE(lev,cur) ((cur)->bc_private.b.forksize)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_RBLOCK_ISIZE)
int xfs_bmap_rblock_isize(int lev, struct xfs_btree_cur *cur);
#define XFS_BMAP_RBLOCK_ISIZE(lev,cur)		xfs_bmap_rblock_isize(lev,cur)
#else
#define XFS_BMAP_RBLOCK_ISIZE(lev,cur) \
	((int)XFS_IFORK_PTR((cur)->bc_private.b.ip, \
			    (cur)->bc_private.b.whichfork)->if_broot_bytes)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_IBLOCK_SIZE)
int xfs_bmap_iblock_size(int lev, struct xfs_btree_cur *cur);
#define XFS_BMAP_IBLOCK_SIZE(lev,cur)		xfs_bmap_iblock_size(lev,cur)
#else
#define XFS_BMAP_IBLOCK_SIZE(lev,cur) (1 << (cur)->bc_blocklog)
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_BLOCK_DSIZE)
int xfs_bmap_block_dsize(int lev, struct xfs_btree_cur *cur);
#define XFS_BMAP_BLOCK_DSIZE(lev,cur)		xfs_bmap_block_dsize(lev,cur)
#else
#define XFS_BMAP_BLOCK_DSIZE(lev,cur) \
	((lev) == (cur)->bc_nlevels - 1 ? \
		XFS_BMAP_RBLOCK_DSIZE(lev,cur) : \
		XFS_BMAP_IBLOCK_SIZE(lev,cur))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_BLOCK_ISIZE)
int xfs_bmap_block_isize(int lev, struct xfs_btree_cur *cur);
#define XFS_BMAP_BLOCK_ISIZE(lev,cur)		xfs_bmap_block_isize(lev,cur)
#else
#define XFS_BMAP_BLOCK_ISIZE(lev,cur) \
	((lev) == (cur)->bc_nlevels - 1 ? \
		XFS_BMAP_RBLOCK_ISIZE(lev,cur) : \
		XFS_BMAP_IBLOCK_SIZE(lev,cur))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_BLOCK_DMAXRECS)
int xfs_bmap_block_dmaxrecs(int lev, struct xfs_btree_cur *cur);
#define XFS_BMAP_BLOCK_DMAXRECS(lev,cur)	xfs_bmap_block_dmaxrecs(lev,cur)
#else
#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]))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_BLOCK_IMAXRECS)
int xfs_bmap_block_imaxrecs(int lev, struct xfs_btree_cur *cur);
#define XFS_BMAP_BLOCK_IMAXRECS(lev,cur)	xfs_bmap_block_imaxrecs(lev,cur)
#else
#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]))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_BLOCK_DMINRECS)
int xfs_bmap_block_dminrecs(int lev, struct xfs_btree_cur *cur);
#define XFS_BMAP_BLOCK_DMINRECS(lev,cur)	xfs_bmap_block_dminrecs(lev,cur)
#else
#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]))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_BLOCK_IMINRECS)
int xfs_bmap_block_iminrecs(int lev, struct xfs_btree_cur *cur);
#define XFS_BMAP_BLOCK_IMINRECS(lev,cur)	xfs_bmap_block_iminrecs(lev,cur)
#else
#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]))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_REC_DADDR)
xfs_bmbt_rec_t *
xfs_bmap_rec_daddr(xfs_bmbt_block_t *bb, int i, struct xfs_btree_cur *cur);
#define XFS_BMAP_REC_DADDR(bb,i,cur)		xfs_bmap_rec_daddr(bb,i,cur)
#else
#define XFS_BMAP_REC_DADDR(bb,i,cur) \
	XFS_BTREE_REC_ADDR(XFS_BMAP_BLOCK_DSIZE(		\
		INT_GET((bb)->bb_level, ARCH_CONVERT), cur),	\
		xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS(	\
			INT_GET((bb)->bb_level, ARCH_CONVERT), cur))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_REC_IADDR)
xfs_bmbt_rec_t *
xfs_bmap_rec_iaddr(xfs_bmbt_block_t *bb, int i, struct xfs_btree_cur *cur);
#define XFS_BMAP_REC_IADDR(bb,i,cur)		xfs_bmap_rec_iaddr(bb,i,cur)
#else
#define XFS_BMAP_REC_IADDR(bb,i,cur) \
	XFS_BTREE_REC_ADDR(XFS_BMAP_BLOCK_ISIZE(		\
		INT_GET((bb)->bb_level, ARCH_CONVERT), cur),	\
		xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS(	\
			INT_GET((bb)->bb_level, ARCH_CONVERT), cur))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_KEY_DADDR)
xfs_bmbt_key_t *
xfs_bmap_key_daddr(xfs_bmbt_block_t *bb, int i, struct xfs_btree_cur *cur);
#define XFS_BMAP_KEY_DADDR(bb,i,cur)		xfs_bmap_key_daddr(bb,i,cur)
#else
#define XFS_BMAP_KEY_DADDR(bb,i,cur) \
	XFS_BTREE_KEY_ADDR(XFS_BMAP_BLOCK_DSIZE(		\
		INT_GET((bb)->bb_level, ARCH_CONVERT), cur),	\
		xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS(	\
			INT_GET((bb)->bb_level, ARCH_CONVERT), cur))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_KEY_IADDR)
xfs_bmbt_key_t *
xfs_bmap_key_iaddr(xfs_bmbt_block_t *bb, int i, struct xfs_btree_cur *cur);
#define XFS_BMAP_KEY_IADDR(bb,i,cur)		xfs_bmap_key_iaddr(bb,i,cur)
#else
#define XFS_BMAP_KEY_IADDR(bb,i,cur) \
	XFS_BTREE_KEY_ADDR(XFS_BMAP_BLOCK_ISIZE(		\
		INT_GET((bb)->bb_level, ARCH_CONVERT), cur),	\
		xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS(	\
			INT_GET((bb)->bb_level, ARCH_CONVERT), cur))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_PTR_DADDR)
xfs_bmbt_ptr_t *
xfs_bmap_ptr_daddr(xfs_bmbt_block_t *bb, int i, struct xfs_btree_cur *cur);
#define XFS_BMAP_PTR_DADDR(bb,i,cur)		xfs_bmap_ptr_daddr(bb,i,cur)
#else
#define XFS_BMAP_PTR_DADDR(bb,i,cur) \
	XFS_BTREE_PTR_ADDR(XFS_BMAP_BLOCK_DSIZE(		\
		INT_GET((bb)->bb_level, ARCH_CONVERT), cur),	\
		xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS(	\
			INT_GET((bb)->bb_level, ARCH_CONVERT), cur))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BMAP_PTR_IADDR)
xfs_bmbt_ptr_t *
xfs_bmap_ptr_iaddr(xfs_bmbt_block_t *bb, int i, struct xfs_btree_cur *cur);
#define XFS_BMAP_PTR_IADDR(bb,i,cur)		xfs_bmap_ptr_iaddr(bb,i,cur)
#else
#define XFS_BMAP_PTR_IADDR(bb,i,cur) \
	XFS_BTREE_PTR_ADDR(XFS_BMAP_BLOCK_ISIZE(		\
		INT_GET((bb)->bb_level, ARCH_CONVERT), cur),	\
		xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS(	\
			INT_GET((bb)->bb_level, ARCH_CONVERT), cur))
#endif