patch-2.4.25 linux-2.4.25/fs/xfs/xfs_dir2_data.h

• Lines: 233
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/fs/xfs/xfs_dir2_data.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/fs/xfs/xfs_dir2_data.h linux-2.4.25/fs/xfs/xfs_dir2_data.h
@@ -0,0 +1,232 @@
+/*
+ * 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_DIR2_DATA_H__
+#define	__XFS_DIR2_DATA_H__
+
+/*
+ * Directory format 2, data block structures.
+ */
+
+struct xfs_dabuf;
+struct xfs_da_args;
+struct xfs_inode;
+struct xfs_trans;
+
+/*
+ * Constants.
+ */
+#define	XFS_DIR2_DATA_MAGIC	0x58443244	/* XD2D: for multiblock dirs */
+#define	XFS_DIR2_DATA_ALIGN_LOG	3		/* i.e., 8 bytes */
+#define	XFS_DIR2_DATA_ALIGN	(1 << XFS_DIR2_DATA_ALIGN_LOG)
+#define	XFS_DIR2_DATA_FREE_TAG	0xffff
+#define	XFS_DIR2_DATA_FD_COUNT	3
+
+/*
+ * Directory address space divided into sections,
+ * spaces separated by 32gb.
+ */
+#define	XFS_DIR2_SPACE_SIZE	(1ULL << (32 + XFS_DIR2_DATA_ALIGN_LOG))
+#define	XFS_DIR2_DATA_SPACE	0
+#define	XFS_DIR2_DATA_OFFSET	(XFS_DIR2_DATA_SPACE * XFS_DIR2_SPACE_SIZE)
+#define	XFS_DIR2_DATA_FIRSTDB(mp)	\
+	XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATA_OFFSET)
+
+/*
+ * Offsets of . and .. in data space (always block 0)
+ */
+#define	XFS_DIR2_DATA_DOT_OFFSET	\
+	((xfs_dir2_data_aoff_t)sizeof(xfs_dir2_data_hdr_t))
+#define	XFS_DIR2_DATA_DOTDOT_OFFSET	\
+	(XFS_DIR2_DATA_DOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(1))
+#define	XFS_DIR2_DATA_FIRST_OFFSET		\
+	(XFS_DIR2_DATA_DOTDOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(2))
+
+/*
+ * Structures.
+ */
+
+/*
+ * Describe a free area in the data block.
+ * The freespace will be formatted as a xfs_dir2_data_unused_t.
+ */
+typedef struct xfs_dir2_data_free {
+	xfs_dir2_data_off_t	offset;		/* start of freespace */
+	xfs_dir2_data_off_t	length;		/* length of freespace */
+} xfs_dir2_data_free_t;
+
+/*
+ * Header for the data blocks.
+ * Always at the beginning of a directory-sized block.
+ * The code knows that XFS_DIR2_DATA_FD_COUNT is 3.
+ */
+typedef struct xfs_dir2_data_hdr {
+	__uint32_t		magic;		/* XFS_DIR2_DATA_MAGIC */
+						/* or XFS_DIR2_BLOCK_MAGIC */
+	xfs_dir2_data_free_t	bestfree[XFS_DIR2_DATA_FD_COUNT];
+} xfs_dir2_data_hdr_t;
+
+/*
+ * Active entry in a data block.  Aligned to 8 bytes.
+ * Tag appears as the last 2 bytes.
+ */
+typedef struct xfs_dir2_data_entry {
+	xfs_ino_t		inumber;	/* inode number */
+	__uint8_t		namelen;	/* name length */
+	__uint8_t		name[1];	/* name bytes, no null */
+						/* variable offset */
+	xfs_dir2_data_off_t	tag;		/* starting offset of us */
+} xfs_dir2_data_entry_t;
+
+/*
+ * Unused entry in a data block.  Aligned to 8 bytes.
+ * Tag appears as the last 2 bytes.
+ */
+typedef struct xfs_dir2_data_unused {
+	__uint16_t		freetag;	/* XFS_DIR2_DATA_FREE_TAG */
+	xfs_dir2_data_off_t	length;		/* total free length */
+						/* variable offset */
+	xfs_dir2_data_off_t	tag;		/* starting offset of us */
+} xfs_dir2_data_unused_t;
+
+typedef union {
+	xfs_dir2_data_entry_t	entry;
+	xfs_dir2_data_unused_t	unused;
+} xfs_dir2_data_union_t;
+
+/*
+ * Generic data block structure, for xfs_db.
+ */
+typedef struct xfs_dir2_data {
+	xfs_dir2_data_hdr_t	hdr;		/* magic XFS_DIR2_DATA_MAGIC */
+	xfs_dir2_data_union_t	u[1];
+} xfs_dir2_data_t;
+
+/*
+ * Macros.
+ */
+
+/*
+ * Size of a data entry.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTSIZE)
+int xfs_dir2_data_entsize(int n);
+#define XFS_DIR2_DATA_ENTSIZE(n)	xfs_dir2_data_entsize(n)
+#else
+#define	XFS_DIR2_DATA_ENTSIZE(n)	\
+	((int)(roundup(offsetof(xfs_dir2_data_entry_t, name[0]) + (n) + \
+		 (uint)sizeof(xfs_dir2_data_off_t), XFS_DIR2_DATA_ALIGN)))
+#endif
+
+/*
+ * Pointer to an entry's tag word.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTRY_TAG_P)
+xfs_dir2_data_off_t *xfs_dir2_data_entry_tag_p(xfs_dir2_data_entry_t *dep);
+#define	XFS_DIR2_DATA_ENTRY_TAG_P(dep)	xfs_dir2_data_entry_tag_p(dep)
+#else
+#define	XFS_DIR2_DATA_ENTRY_TAG_P(dep)	\
+	((xfs_dir2_data_off_t *)\
+	 ((char *)(dep) + XFS_DIR2_DATA_ENTSIZE((dep)->namelen) - \
+	  (uint)sizeof(xfs_dir2_data_off_t)))
+#endif
+
+/*
+ * Pointer to a freespace's tag word.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_UNUSED_TAG_P)
+xfs_dir2_data_off_t *xfs_dir2_data_unused_tag_p_arch(
+	xfs_dir2_data_unused_t *dup, xfs_arch_t arch);
+#define	XFS_DIR2_DATA_UNUSED_TAG_P_ARCH(dup,arch) \
+	xfs_dir2_data_unused_tag_p_arch(dup,arch)
+#else
+#define	XFS_DIR2_DATA_UNUSED_TAG_P_ARCH(dup,arch)	\
+	((xfs_dir2_data_off_t *)\
+	 ((char *)(dup) + INT_GET((dup)->length, arch) \
+			- (uint)sizeof(xfs_dir2_data_off_t)))
+#endif
+
+/*
+ * Function declarations.
+ */
+
+#ifdef DEBUG
+extern void
+	xfs_dir2_data_check(struct xfs_inode *dp, struct xfs_dabuf *bp);
+#else
+#define	xfs_dir2_data_check(dp,bp)
+#endif
+
+extern xfs_dir2_data_free_t *
+	xfs_dir2_data_freefind(xfs_dir2_data_t *d,
+			       xfs_dir2_data_unused_t *dup);
+
+extern xfs_dir2_data_free_t *
+	xfs_dir2_data_freeinsert(xfs_dir2_data_t *d,
+				 xfs_dir2_data_unused_t *dup, int *loghead);
+
+extern void
+	xfs_dir2_data_freeremove(xfs_dir2_data_t *d,
+				 xfs_dir2_data_free_t *dfp, int *loghead);
+
+extern void
+	xfs_dir2_data_freescan(struct xfs_mount *mp, xfs_dir2_data_t *d,
+			       int *loghead, char *aendp);
+
+extern int
+	xfs_dir2_data_init(struct xfs_da_args *args, xfs_dir2_db_t blkno,
+			   struct xfs_dabuf **bpp);
+
+extern void
+	xfs_dir2_data_log_entry(struct xfs_trans *tp, struct xfs_dabuf *bp,
+				xfs_dir2_data_entry_t *dep);
+
+extern void
+	xfs_dir2_data_log_header(struct xfs_trans *tp, struct xfs_dabuf *bp);
+
+extern void
+	xfs_dir2_data_log_unused(struct xfs_trans *tp, struct xfs_dabuf *bp,
+				 xfs_dir2_data_unused_t *dup);
+
+extern void
+	xfs_dir2_data_make_free(struct xfs_trans *tp, struct xfs_dabuf *bp,
+				xfs_dir2_data_aoff_t offset,
+				xfs_dir2_data_aoff_t len, int *needlogp,
+				int *needscanp);
+
+extern void
+	xfs_dir2_data_use_free(struct xfs_trans *tp, struct xfs_dabuf *bp,
+			       xfs_dir2_data_unused_t *dup,
+			       xfs_dir2_data_aoff_t offset,
+			       xfs_dir2_data_aoff_t len, int *needlogp,
+			       int *needscanp);
+
+#endif	/* __XFS_DIR2_DATA_H__ */