patch-2.4.25 linux-2.4.25/fs/xfs/xfs_btree.h

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diff -urN linux-2.4.24/fs/xfs/xfs_btree.h linux-2.4.25/fs/xfs/xfs_btree.h
@@ -0,0 +1,592 @@
+/*
+ * Copyright (c) 2000-2001 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_BTREE_H__
+#define	__XFS_BTREE_H__
+
+struct xfs_buf;
+struct xfs_bmap_free;
+struct xfs_inode;
+struct xfs_mount;
+struct xfs_trans;
+
+/*
+ * This nonsense is to make -wlint happy.
+ */
+#define	XFS_LOOKUP_EQ	((xfs_lookup_t)XFS_LOOKUP_EQi)
+#define	XFS_LOOKUP_LE	((xfs_lookup_t)XFS_LOOKUP_LEi)
+#define	XFS_LOOKUP_GE	((xfs_lookup_t)XFS_LOOKUP_GEi)
+
+#define	XFS_BTNUM_BNO	((xfs_btnum_t)XFS_BTNUM_BNOi)
+#define	XFS_BTNUM_CNT	((xfs_btnum_t)XFS_BTNUM_CNTi)
+#define	XFS_BTNUM_BMAP	((xfs_btnum_t)XFS_BTNUM_BMAPi)
+#define	XFS_BTNUM_INO	((xfs_btnum_t)XFS_BTNUM_INOi)
+
+/*
+ * Short form header: space allocation btrees.
+ */
+typedef struct xfs_btree_sblock
+{
+	__uint32_t	bb_magic;	/* magic number for block type */
+	__uint16_t	bb_level;	/* 0 is a leaf */
+	__uint16_t	bb_numrecs;	/* current # of data records */
+	xfs_agblock_t	bb_leftsib;	/* left sibling block or NULLAGBLOCK */
+	xfs_agblock_t	bb_rightsib;	/* right sibling block or NULLAGBLOCK */
+} xfs_btree_sblock_t;
+
+/*
+ * Long form header: bmap btrees.
+ */
+typedef struct xfs_btree_lblock
+{
+	__uint32_t	bb_magic;	/* magic number for block type */
+	__uint16_t	bb_level;	/* 0 is a leaf */
+	__uint16_t	bb_numrecs;	/* current # of data records */
+	xfs_dfsbno_t	bb_leftsib;	/* left sibling block or NULLDFSBNO */
+	xfs_dfsbno_t	bb_rightsib;	/* right sibling block or NULLDFSBNO */
+} xfs_btree_lblock_t;
+
+/*
+ * Combined header and structure, used by common code.
+ */
+typedef struct xfs_btree_hdr
+{
+	__uint32_t	bb_magic;	/* magic number for block type */
+	__uint16_t	bb_level;	/* 0 is a leaf */
+	__uint16_t	bb_numrecs;	/* current # of data records */
+} xfs_btree_hdr_t;
+
+typedef struct xfs_btree_block
+{
+	xfs_btree_hdr_t	bb_h;		/* header */
+	union		{
+		struct	{
+			xfs_agblock_t	bb_leftsib;
+			xfs_agblock_t	bb_rightsib;
+		}	s;		/* short form pointers */
+		struct	{
+			xfs_dfsbno_t	bb_leftsib;
+			xfs_dfsbno_t	bb_rightsib;
+		}	l;		/* long form pointers */
+	}		bb_u;		/* rest */
+} xfs_btree_block_t;
+
+/*
+ * For logging record fields.
+ */
+#define	XFS_BB_MAGIC		0x01
+#define	XFS_BB_LEVEL		0x02
+#define	XFS_BB_NUMRECS		0x04
+#define	XFS_BB_LEFTSIB		0x08
+#define	XFS_BB_RIGHTSIB		0x10
+#define	XFS_BB_NUM_BITS		5
+#define	XFS_BB_ALL_BITS		((1 << XFS_BB_NUM_BITS) - 1)
+
+/*
+ * Boolean to select which form of xfs_btree_block_t.bb_u to use.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BTREE_LONG_PTRS)
+int xfs_btree_long_ptrs(xfs_btnum_t btnum);
+#define	XFS_BTREE_LONG_PTRS(btnum)	((btnum) == XFS_BTNUM_BMAP)
+#else
+#define	XFS_BTREE_LONG_PTRS(btnum)	((btnum) == XFS_BTNUM_BMAP)
+#endif
+
+/*
+ * Magic numbers for btree blocks.
+ */
+extern const __uint32_t	xfs_magics[];
+
+/*
+ * Maximum and minimum records in a btree block.
+ * Given block size, type prefix, and leaf flag (0 or 1).
+ * The divisor below is equivalent to lf ? (e1) : (e2) but that produces
+ * compiler warnings.
+ */
+#define	XFS_BTREE_BLOCK_MAXRECS(bsz,t,lf)	\
+	((int)(((bsz) - (uint)sizeof(t ## _block_t)) / \
+	 (((lf) * (uint)sizeof(t ## _rec_t)) + \
+	  ((1 - (lf)) * \
+	   ((uint)sizeof(t ## _key_t) + (uint)sizeof(t ## _ptr_t))))))
+#define	XFS_BTREE_BLOCK_MINRECS(bsz,t,lf)	\
+	(XFS_BTREE_BLOCK_MAXRECS(bsz,t,lf) / 2)
+
+/*
+ * Record, key, and pointer address calculation macros.
+ * Given block size, type prefix, block pointer, and index of requested entry
+ * (first entry numbered 1).
+ */
+#define	XFS_BTREE_REC_ADDR(bsz,t,bb,i,mxr)	\
+	((t ## _rec_t *)((char *)(bb) + sizeof(t ## _block_t) + \
+	 ((i) - 1) * sizeof(t ## _rec_t)))
+#define	XFS_BTREE_KEY_ADDR(bsz,t,bb,i,mxr)	\
+	((t ## _key_t *)((char *)(bb) + sizeof(t ## _block_t) + \
+	 ((i) - 1) * sizeof(t ## _key_t)))
+#define	XFS_BTREE_PTR_ADDR(bsz,t,bb,i,mxr)	\
+	((t ## _ptr_t *)((char *)(bb) + sizeof(t ## _block_t) + \
+	 (mxr) * sizeof(t ## _key_t) + ((i) - 1) * sizeof(t ## _ptr_t)))
+
+#define	XFS_BTREE_MAXLEVELS	8	/* max of all btrees */
+
+/*
+ * Btree cursor structure.
+ * This collects all information needed by the btree code in one place.
+ */
+typedef struct xfs_btree_cur
+{
+	struct xfs_trans	*bc_tp;	/* transaction we're in, if any */
+	struct xfs_mount	*bc_mp;	/* file system mount struct */
+	union {
+		xfs_alloc_rec_t		a;
+		xfs_bmbt_irec_t		b;
+		xfs_inobt_rec_t		i;
+	}		bc_rec;		/* current insert/search record value */
+	struct xfs_buf	*bc_bufs[XFS_BTREE_MAXLEVELS];	/* buf ptr per level */
+	int		bc_ptrs[XFS_BTREE_MAXLEVELS];	/* key/record # */
+	__uint8_t	bc_ra[XFS_BTREE_MAXLEVELS];	/* readahead bits */
+#define	XFS_BTCUR_LEFTRA	1	/* left sibling has been read-ahead */
+#define	XFS_BTCUR_RIGHTRA	2	/* right sibling has been read-ahead */
+	__uint8_t	bc_nlevels;	/* number of levels in the tree */
+	__uint8_t	bc_blocklog;	/* log2(blocksize) of btree blocks */
+	xfs_btnum_t	bc_btnum;	/* identifies which btree type */
+	union {
+		struct {			/* needed for BNO, CNT */
+			struct xfs_buf	*agbp;	/* agf buffer pointer */
+			xfs_agnumber_t	agno;	/* ag number */
+		} a;
+		struct {			/* needed for BMAP */
+			struct xfs_inode *ip;	/* pointer to our inode */
+			struct xfs_bmap_free *flist;	/* list to free after */
+			xfs_fsblock_t	firstblock;	/* 1st blk allocated */
+			int		allocated;	/* count of alloced */
+			short		forksize;	/* fork's inode space */
+			char		whichfork;	/* data or attr fork */
+			char		flags;		/* flags */
+#define	XFS_BTCUR_BPRV_WASDEL	1			/* was delayed */
+		} b;
+		struct {			/* needed for INO */
+			struct xfs_buf	*agbp;	/* agi buffer pointer */
+			xfs_agnumber_t	agno;	/* ag number */
+		} i;
+	}		bc_private;	/* per-btree type data */
+} xfs_btree_cur_t;
+
+#define	XFS_BTREE_NOERROR	0
+#define	XFS_BTREE_ERROR		1
+
+/*
+ * Convert from buffer to btree block header.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_BLOCK)
+xfs_btree_block_t *xfs_buf_to_block(struct xfs_buf *bp);
+#define	XFS_BUF_TO_BLOCK(bp)	xfs_buf_to_block(bp)
+#else
+#define	XFS_BUF_TO_BLOCK(bp)	((xfs_btree_block_t *)(XFS_BUF_PTR(bp)))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_LBLOCK)
+xfs_btree_lblock_t *xfs_buf_to_lblock(struct xfs_buf *bp);
+#define	XFS_BUF_TO_LBLOCK(bp)	xfs_buf_to_lblock(bp)
+#else
+#define	XFS_BUF_TO_LBLOCK(bp)	((xfs_btree_lblock_t *)(XFS_BUF_PTR(bp)))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_SBLOCK)
+xfs_btree_sblock_t *xfs_buf_to_sblock(struct xfs_buf *bp);
+#define	XFS_BUF_TO_SBLOCK(bp)	xfs_buf_to_sblock(bp)
+#else
+#define	XFS_BUF_TO_SBLOCK(bp)	((xfs_btree_sblock_t *)(XFS_BUF_PTR(bp)))
+#endif
+
+#ifdef __KERNEL__
+
+#ifdef DEBUG
+/*
+ * Debug routine: check that block header is ok.
+ */
+void
+xfs_btree_check_block(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	xfs_btree_block_t	*block,	/* generic btree block pointer */
+	int			level,	/* level of the btree block */
+	struct xfs_buf		*bp);	/* buffer containing block, if any */
+
+/*
+ * Debug routine: check that keys are in the right order.
+ */
+void
+xfs_btree_check_key(
+	xfs_btnum_t		btnum,	/* btree identifier */
+	void			*ak1,	/* pointer to left (lower) key */
+	void			*ak2);	/* pointer to right (higher) key */
+
+/*
+ * Debug routine: check that records are in the right order.
+ */
+void
+xfs_btree_check_rec(
+	xfs_btnum_t		btnum,	/* btree identifier */
+	void			*ar1,	/* pointer to left (lower) record */
+	void			*ar2);	/* pointer to right (higher) record */
+#else
+#define	xfs_btree_check_block(a,b,c,d)
+#define	xfs_btree_check_key(a,b,c)
+#define	xfs_btree_check_rec(a,b,c)
+#endif	/* DEBUG */
+
+/*
+ * Checking routine: check that long form block header is ok.
+ */
+int					/* error (0 or EFSCORRUPTED) */
+xfs_btree_check_lblock(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	xfs_btree_lblock_t	*block,	/* btree long form block pointer */
+	int			level,	/* level of the btree block */
+	struct xfs_buf		*bp);	/* buffer containing block, if any */
+
+/*
+ * Checking routine: check that (long) pointer is ok.
+ */
+int					/* error (0 or EFSCORRUPTED) */
+xfs_btree_check_lptr(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	xfs_dfsbno_t		ptr,	/* btree block disk address */
+	int			level);	/* btree block level */
+
+/*
+ * Checking routine: check that short form block header is ok.
+ */
+int					/* error (0 or EFSCORRUPTED) */
+xfs_btree_check_sblock(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	xfs_btree_sblock_t	*block,	/* btree short form block pointer */
+	int			level,	/* level of the btree block */
+	struct xfs_buf		*bp);	/* buffer containing block */
+
+/*
+ * Checking routine: check that (short) pointer is ok.
+ */
+int					/* error (0 or EFSCORRUPTED) */
+xfs_btree_check_sptr(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	xfs_agblock_t		ptr,	/* btree block disk address */
+	int			level);	/* btree block level */
+
+/*
+ * Delete the btree cursor.
+ */
+void
+xfs_btree_del_cursor(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			error);	/* del because of error */
+
+/*
+ * Duplicate the btree cursor.
+ * Allocate a new one, copy the record, re-get the buffers.
+ */
+int					/* error */
+xfs_btree_dup_cursor(
+	xfs_btree_cur_t		*cur,	/* input cursor */
+	xfs_btree_cur_t		**ncur);/* output cursor */
+
+/*
+ * Change the cursor to point to the first record in the current block
+ * at the given level.  Other levels are unaffected.
+ */
+int					/* success=1, failure=0 */
+xfs_btree_firstrec(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level);	/* level to change */
+
+/*
+ * Retrieve the block pointer from the cursor at the given level.
+ * This may be a bmap btree root or from a buffer.
+ */
+xfs_btree_block_t *			/* generic btree block pointer */
+xfs_btree_get_block(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level,	/* level in btree */
+	struct xfs_buf		**bpp);	/* buffer containing the block */
+
+/*
+ * Get a buffer for the block, return it with no data read.
+ * Long-form addressing.
+ */
+struct xfs_buf *				/* buffer for fsbno */
+xfs_btree_get_bufl(
+	struct xfs_mount	*mp,	/* file system mount point */
+	struct xfs_trans	*tp,	/* transaction pointer */
+	xfs_fsblock_t		fsbno,	/* file system block number */
+	uint			lock);	/* lock flags for get_buf */
+
+/*
+ * Get a buffer for the block, return it with no data read.
+ * Short-form addressing.
+ */
+struct xfs_buf *				/* buffer for agno/agbno */
+xfs_btree_get_bufs(
+	struct xfs_mount	*mp,	/* file system mount point */
+	struct xfs_trans	*tp,	/* transaction pointer */
+	xfs_agnumber_t		agno,	/* allocation group number */
+	xfs_agblock_t		agbno,	/* allocation group block number */
+	uint			lock);	/* lock flags for get_buf */
+
+/*
+ * Allocate a new btree cursor.
+ * The cursor is either for allocation (A) or bmap (B).
+ */
+xfs_btree_cur_t *			/* new btree cursor */
+xfs_btree_init_cursor(
+	struct xfs_mount	*mp,	/* file system mount point */
+	struct xfs_trans	*tp,	/* transaction pointer */
+	struct xfs_buf		*agbp,	/* (A only) buffer for agf structure */
+	xfs_agnumber_t		agno,	/* (A only) allocation group number */
+	xfs_btnum_t		btnum,	/* btree identifier */
+	struct xfs_inode	*ip,	/* (B only) inode owning the btree */
+	int			whichfork); /* (B only) data/attr fork */
+
+/*
+ * Check for the cursor referring to the last block at the given level.
+ */
+int					/* 1=is last block, 0=not last block */
+xfs_btree_islastblock(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level);	/* level to check */
+
+/*
+ * Change the cursor to point to the last record in the current block
+ * at the given level.  Other levels are unaffected.
+ */
+int					/* success=1, failure=0 */
+xfs_btree_lastrec(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level);	/* level to change */
+
+/*
+ * Compute first and last byte offsets for the fields given.
+ * Interprets the offsets table, which contains struct field offsets.
+ */
+void
+xfs_btree_offsets(
+	__int64_t		fields,	/* bitmask of fields */
+	const short		*offsets,/* table of field offsets */
+	int			nbits,	/* number of bits to inspect */
+	int			*first,	/* output: first byte offset */
+	int			*last);	/* output: last byte offset */
+
+/*
+ * Get a buffer for the block, return it read in.
+ * Long-form addressing.
+ */
+int					/* error */
+xfs_btree_read_bufl(
+	struct xfs_mount	*mp,	/* file system mount point */
+	struct xfs_trans	*tp,	/* transaction pointer */
+	xfs_fsblock_t		fsbno,	/* file system block number */
+	uint			lock,	/* lock flags for read_buf */
+	struct xfs_buf		**bpp,	/* buffer for fsbno */
+	int			refval);/* ref count value for buffer */
+
+/*
+ * Get a buffer for the block, return it read in.
+ * Short-form addressing.
+ */
+int					/* error */
+xfs_btree_read_bufs(
+	struct xfs_mount	*mp,	/* file system mount point */
+	struct xfs_trans	*tp,	/* transaction pointer */
+	xfs_agnumber_t		agno,	/* allocation group number */
+	xfs_agblock_t		agbno,	/* allocation group block number */
+	uint			lock,	/* lock flags for read_buf */
+	struct xfs_buf		**bpp,	/* buffer for agno/agbno */
+	int			refval);/* ref count value for buffer */
+
+/*
+ * Read-ahead the block, don't wait for it, don't return a buffer.
+ * Long-form addressing.
+ */
+void					/* error */
+xfs_btree_reada_bufl(
+	struct xfs_mount	*mp,	/* file system mount point */
+	xfs_fsblock_t		fsbno,	/* file system block number */
+	xfs_extlen_t		count);	/* count of filesystem blocks */
+
+/*
+ * Read-ahead the block, don't wait for it, don't return a buffer.
+ * Short-form addressing.
+ */
+void					/* error */
+xfs_btree_reada_bufs(
+	struct xfs_mount	*mp,	/* file system mount point */
+	xfs_agnumber_t		agno,	/* allocation group number */
+	xfs_agblock_t		agbno,	/* allocation group block number */
+	xfs_extlen_t		count);	/* count of filesystem blocks */
+
+/*
+ * Read-ahead btree blocks, at the given level.
+ * Bits in lr are set from XFS_BTCUR_{LEFT,RIGHT}RA.
+ */
+int					/* readahead block count */
+xfs_btree_readahead_core(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			lev,	/* level in btree */
+	int			lr);	/* left/right bits */
+
+static inline int			/* readahead block count */
+xfs_btree_readahead(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			lev,	/* level in btree */
+	int			lr)	/* left/right bits */
+{
+	if ((cur->bc_ra[lev] | lr) == cur->bc_ra[lev])
+		return 0;
+
+	return xfs_btree_readahead_core(cur, lev, lr);
+}
+
+
+/*
+ * Set the buffer for level "lev" in the cursor to bp, releasing
+ * any previous buffer.
+ */
+void
+xfs_btree_setbuf(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			lev,	/* level in btree */
+	struct xfs_buf		*bp);	/* new buffer to set */
+
+#endif	/* __KERNEL__ */
+
+
+/*
+ * Min and max functions for extlen, agblock, fileoff, and filblks types.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_EXTLEN_MIN)
+xfs_extlen_t xfs_extlen_min(xfs_extlen_t a, xfs_extlen_t b);
+#define	XFS_EXTLEN_MIN(a,b)	xfs_extlen_min(a,b)
+#else
+#define	XFS_EXTLEN_MIN(a,b)	\
+	((xfs_extlen_t)(a) < (xfs_extlen_t)(b) ? \
+	 (xfs_extlen_t)(a) : (xfs_extlen_t)(b))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_EXTLEN_MAX)
+xfs_extlen_t xfs_extlen_max(xfs_extlen_t a, xfs_extlen_t b);
+#define	XFS_EXTLEN_MAX(a,b)	xfs_extlen_max(a,b)
+#else
+#define	XFS_EXTLEN_MAX(a,b)	\
+	((xfs_extlen_t)(a) > (xfs_extlen_t)(b) ? \
+	 (xfs_extlen_t)(a) : (xfs_extlen_t)(b))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGBLOCK_MIN)
+xfs_agblock_t xfs_agblock_min(xfs_agblock_t a, xfs_agblock_t b);
+#define	XFS_AGBLOCK_MIN(a,b)	xfs_agblock_min(a,b)
+#else
+#define	XFS_AGBLOCK_MIN(a,b)	\
+	((xfs_agblock_t)(a) < (xfs_agblock_t)(b) ? \
+	 (xfs_agblock_t)(a) : (xfs_agblock_t)(b))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGBLOCK_MAX)
+xfs_agblock_t xfs_agblock_max(xfs_agblock_t a, xfs_agblock_t b);
+#define	XFS_AGBLOCK_MAX(a,b)	xfs_agblock_max(a,b)
+#else
+#define	XFS_AGBLOCK_MAX(a,b)	\
+	((xfs_agblock_t)(a) > (xfs_agblock_t)(b) ? \
+	 (xfs_agblock_t)(a) : (xfs_agblock_t)(b))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FILEOFF_MIN)
+xfs_fileoff_t xfs_fileoff_min(xfs_fileoff_t a, xfs_fileoff_t b);
+#define	XFS_FILEOFF_MIN(a,b)	xfs_fileoff_min(a,b)
+#else
+#define	XFS_FILEOFF_MIN(a,b)	\
+	((xfs_fileoff_t)(a) < (xfs_fileoff_t)(b) ? \
+	 (xfs_fileoff_t)(a) : (xfs_fileoff_t)(b))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FILEOFF_MAX)
+xfs_fileoff_t xfs_fileoff_max(xfs_fileoff_t a, xfs_fileoff_t b);
+#define	XFS_FILEOFF_MAX(a,b)	xfs_fileoff_max(a,b)
+#else
+#define	XFS_FILEOFF_MAX(a,b)	\
+	((xfs_fileoff_t)(a) > (xfs_fileoff_t)(b) ? \
+	 (xfs_fileoff_t)(a) : (xfs_fileoff_t)(b))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FILBLKS_MIN)
+xfs_filblks_t xfs_filblks_min(xfs_filblks_t a, xfs_filblks_t b);
+#define	XFS_FILBLKS_MIN(a,b)	xfs_filblks_min(a,b)
+#else
+#define	XFS_FILBLKS_MIN(a,b)	\
+	((xfs_filblks_t)(a) < (xfs_filblks_t)(b) ? \
+	 (xfs_filblks_t)(a) : (xfs_filblks_t)(b))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FILBLKS_MAX)
+xfs_filblks_t xfs_filblks_max(xfs_filblks_t a, xfs_filblks_t b);
+#define	XFS_FILBLKS_MAX(a,b)	xfs_filblks_max(a,b)
+#else
+#define	XFS_FILBLKS_MAX(a,b)	\
+	((xfs_filblks_t)(a) > (xfs_filblks_t)(b) ? \
+	 (xfs_filblks_t)(a) : (xfs_filblks_t)(b))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_SANITY_CHECK)
+int xfs_fsb_sanity_check(struct xfs_mount *mp, xfs_fsblock_t fsb);
+#define	XFS_FSB_SANITY_CHECK(mp,fsb)	xfs_fsb_sanity_check(mp,fsb)
+#else
+#define	XFS_FSB_SANITY_CHECK(mp,fsb)	\
+	(XFS_FSB_TO_AGNO(mp, fsb) < mp->m_sb.sb_agcount && \
+	 XFS_FSB_TO_AGBNO(mp, fsb) < mp->m_sb.sb_agblocks)
+#endif
+
+/*
+ * Macros to set EFSCORRUPTED & return/branch.
+ */
+#define	XFS_WANT_CORRUPTED_GOTO(x,l)	\
+	{ \
+		int fs_is_ok = (x); \
+		ASSERT(fs_is_ok); \
+		if (unlikely(!fs_is_ok)) { \
+			XFS_ERROR_REPORT("XFS_WANT_CORRUPTED_GOTO", \
+					 XFS_ERRLEVEL_LOW, NULL); \
+			error = XFS_ERROR(EFSCORRUPTED); \
+			goto l; \
+		} \
+	}
+
+#define	XFS_WANT_CORRUPTED_RETURN(x)	\
+	{ \
+		int fs_is_ok = (x); \
+		ASSERT(fs_is_ok); \
+		if (unlikely(!fs_is_ok)) { \
+			XFS_ERROR_REPORT("XFS_WANT_CORRUPTED_RETURN", \
+					 XFS_ERRLEVEL_LOW, NULL); \
+			return XFS_ERROR(EFSCORRUPTED); \
+		} \
+	}
+
+#endif	/* __XFS_BTREE_H__ */
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TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)