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

• Lines: 258
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/fs/xfs/xfs_alloc_btree.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/fs/xfs/xfs_alloc_btree.h linux-2.4.25/fs/xfs/xfs_alloc_btree.h
@@ -0,0 +1,257 @@
+/*
+ * Copyright (c) 2000 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_ALLOC_BTREE_H__
+#define	__XFS_ALLOC_BTREE_H__
+
+/*
+ * Freespace on-disk structures
+ */
+
+struct xfs_buf;
+struct xfs_btree_cur;
+struct xfs_btree_sblock;
+struct xfs_mount;
+
+/*
+ * There are two on-disk btrees, one sorted by blockno and one sorted
+ * by blockcount and blockno.  All blocks look the same to make the code
+ * simpler; if we have time later, we'll make the optimizations.
+ */
+#define	XFS_ABTB_MAGIC	0x41425442	/* 'ABTB' for bno tree */
+#define	XFS_ABTC_MAGIC	0x41425443	/* 'ABTC' for cnt tree */
+
+/*
+ * Data record/key structure
+ */
+typedef struct xfs_alloc_rec
+{
+	xfs_agblock_t	ar_startblock;	/* starting block number */
+	xfs_extlen_t	ar_blockcount;	/* count of free blocks */
+} xfs_alloc_rec_t, xfs_alloc_key_t;
+
+typedef xfs_agblock_t xfs_alloc_ptr_t;	/* btree pointer type */
+					/* btree block header type */
+typedef	struct xfs_btree_sblock xfs_alloc_block_t;
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_ALLOC_BLOCK)
+xfs_alloc_block_t *xfs_buf_to_alloc_block(struct xfs_buf *bp);
+#define	XFS_BUF_TO_ALLOC_BLOCK(bp)	xfs_buf_to_alloc_block(bp)
+#else
+#define	XFS_BUF_TO_ALLOC_BLOCK(bp) ((xfs_alloc_block_t *)(XFS_BUF_PTR(bp)))
+#endif
+
+/*
+ * Real block structures have a size equal to the disk block size.
+ */
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_BLOCK_SIZE)
+int xfs_alloc_block_size(int lev, struct xfs_btree_cur *cur);
+#define	XFS_ALLOC_BLOCK_SIZE(lev,cur)	xfs_alloc_block_size(lev,cur)
+#else
+#define	XFS_ALLOC_BLOCK_SIZE(lev,cur)	(1 << (cur)->bc_blocklog)
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_BLOCK_MAXRECS)
+int xfs_alloc_block_maxrecs(int lev, struct xfs_btree_cur *cur);
+#define	XFS_ALLOC_BLOCK_MAXRECS(lev,cur)	xfs_alloc_block_maxrecs(lev,cur)
+#else
+#define	XFS_ALLOC_BLOCK_MAXRECS(lev,cur)	\
+	((cur)->bc_mp->m_alloc_mxr[lev != 0])
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_BLOCK_MINRECS)
+int xfs_alloc_block_minrecs(int lev, struct xfs_btree_cur *cur);
+#define	XFS_ALLOC_BLOCK_MINRECS(lev,cur)	xfs_alloc_block_minrecs(lev,cur)
+#else
+#define	XFS_ALLOC_BLOCK_MINRECS(lev,cur)	\
+	((cur)->bc_mp->m_alloc_mnr[lev != 0])
+#endif
+
+/*
+ * Minimum and maximum blocksize and sectorsize.
+ * The blocksize upper limit is pretty much arbitrary.
+ * The sectorsize upper limit is due to sizeof(sb_sectsize).
+ */
+#define XFS_MIN_BLOCKSIZE_LOG	9	/* i.e. 512 bytes */
+#define XFS_MAX_BLOCKSIZE_LOG	16	/* i.e. 65536 bytes */
+#define XFS_MIN_BLOCKSIZE	(1 << XFS_MIN_BLOCKSIZE_LOG)
+#define XFS_MAX_BLOCKSIZE	(1 << XFS_MAX_BLOCKSIZE_LOG)
+#define XFS_MIN_SECTORSIZE_LOG	9	/* i.e. 512 bytes */
+#define XFS_MAX_SECTORSIZE_LOG	15	/* i.e. 32768 bytes */
+#define XFS_MIN_SECTORSIZE	(1 << XFS_MIN_SECTORSIZE_LOG)
+#define XFS_MAX_SECTORSIZE	(1 << XFS_MAX_SECTORSIZE_LOG)
+
+/*
+ * Block numbers in the AG:
+ * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BNO_BLOCK)
+xfs_agblock_t xfs_bno_block(struct xfs_mount *mp);
+#define	XFS_BNO_BLOCK(mp)	xfs_bno_block(mp)
+#else
+#define	XFS_BNO_BLOCK(mp)	((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_CNT_BLOCK)
+xfs_agblock_t xfs_cnt_block(struct xfs_mount *mp);
+#define	XFS_CNT_BLOCK(mp)	xfs_cnt_block(mp)
+#else
+#define	XFS_CNT_BLOCK(mp)	((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
+#endif
+
+/*
+ * Record, key, and pointer address macros for btree blocks.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_REC_ADDR)
+xfs_alloc_rec_t *xfs_alloc_rec_addr(xfs_alloc_block_t *bb, int i,
+				    struct xfs_btree_cur *cur);
+#define	XFS_ALLOC_REC_ADDR(bb,i,cur)	xfs_alloc_rec_addr(bb,i,cur)
+#else
+#define	XFS_ALLOC_REC_ADDR(bb,i,cur)	\
+	XFS_BTREE_REC_ADDR(XFS_ALLOC_BLOCK_SIZE(0,cur), xfs_alloc, bb, i, \
+		XFS_ALLOC_BLOCK_MAXRECS(0, cur))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_KEY_ADDR)
+xfs_alloc_key_t *xfs_alloc_key_addr(xfs_alloc_block_t *bb, int i,
+				    struct xfs_btree_cur *cur);
+#define	XFS_ALLOC_KEY_ADDR(bb,i,cur)	xfs_alloc_key_addr(bb,i,cur)
+#else
+#define	XFS_ALLOC_KEY_ADDR(bb,i,cur)	\
+	XFS_BTREE_KEY_ADDR(XFS_ALLOC_BLOCK_SIZE(1,cur), xfs_alloc, bb, i, \
+		XFS_ALLOC_BLOCK_MAXRECS(1, cur))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_PTR_ADDR)
+xfs_alloc_ptr_t *xfs_alloc_ptr_addr(xfs_alloc_block_t *bb, int i,
+				    struct xfs_btree_cur *cur);
+#define	XFS_ALLOC_PTR_ADDR(bb,i,cur)	xfs_alloc_ptr_addr(bb,i,cur)
+#else
+#define	XFS_ALLOC_PTR_ADDR(bb,i,cur)	\
+	XFS_BTREE_PTR_ADDR(XFS_ALLOC_BLOCK_SIZE(1,cur), xfs_alloc, bb, i, \
+		XFS_ALLOC_BLOCK_MAXRECS(1, cur))
+#endif
+
+/*
+ * Prototypes for externally visible routines.
+ */
+
+/*
+ * Decrement cursor by one record at the level.
+ * For nonzero levels the leaf-ward information is untouched.
+ */
+int					/* error */
+xfs_alloc_decrement(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	int			level,	/* level in btree, 0 is leaf */
+	int			*stat);	/* success/failure */
+
+/*
+ * Delete the record pointed to by cur.
+ * The cursor refers to the place where the record was (could be inserted)
+ * when the operation returns.
+ */
+int					/* error */
+xfs_alloc_delete(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	int			*stat);	/* success/failure */
+
+/*
+ * Get the data from the pointed-to record.
+ */
+int					/* error */
+xfs_alloc_get_rec(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	xfs_agblock_t		*bno,	/* output: starting block of extent */
+	xfs_extlen_t		*len,	/* output: length of extent */
+	int			*stat);	/* output: success/failure */
+
+/*
+ * Increment cursor by one record at the level.
+ * For nonzero levels the leaf-ward information is untouched.
+ */
+int					/* error */
+xfs_alloc_increment(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	int			level,	/* level in btree, 0 is leaf */
+	int			*stat);	/* success/failure */
+
+/*
+ * Insert the current record at the point referenced by cur.
+ * The cursor may be inconsistent on return if splits have been done.
+ */
+int					/* error */
+xfs_alloc_insert(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	int			*stat);	/* success/failure */
+
+/*
+ * Lookup the record equal to [bno, len] in the btree given by cur.
+ */
+int					/* error */
+xfs_alloc_lookup_eq(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	xfs_agblock_t		bno,	/* starting block of extent */
+	xfs_extlen_t		len,	/* length of extent */
+	int			*stat);	/* success/failure */
+
+/*
+ * Lookup the first record greater than or equal to [bno, len]
+ * in the btree given by cur.
+ */
+int					/* error */
+xfs_alloc_lookup_ge(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	xfs_agblock_t		bno,	/* starting block of extent */
+	xfs_extlen_t		len,	/* length of extent */
+	int			*stat);	/* success/failure */
+
+/*
+ * Lookup the first record less than or equal to [bno, len]
+ * in the btree given by cur.
+ */
+int					/* error */
+xfs_alloc_lookup_le(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	xfs_agblock_t		bno,	/* starting block of extent */
+	xfs_extlen_t		len,	/* length of extent */
+	int			*stat);	/* success/failure */
+
+/*
+ * Update the record referred to by cur, to the value given by [bno, len].
+ * This either works (return 0) or gets an EFSCORRUPTED error.
+ */
+int					/* error */
+xfs_alloc_update(
+	struct xfs_btree_cur	*cur,	/* btree cursor */
+	xfs_agblock_t		bno,	/* starting block of extent */
+	xfs_extlen_t		len);	/* length of extent */
+
+#endif	/* __XFS_ALLOC_BTREE_H__ */