patch-2.4.25 linux-2.4.25/fs/xfs/xfs_dir2_sf.h

• Lines: 256
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/fs/xfs/xfs_dir2_sf.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/fs/xfs/xfs_dir2_sf.h linux-2.4.25/fs/xfs/xfs_dir2_sf.h
@@ -0,0 +1,255 @@
+/*
+ * 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_DIR2_SF_H__
+#define	__XFS_DIR2_SF_H__
+
+/*
+ * Directory layout when stored internal to an inode.
+ *
+ * Small directories are packed as tightly as possible so as to
+ * fit into the literal area of the inode.
+ */
+
+struct uio;
+struct xfs_dabuf;
+struct xfs_da_args;
+struct xfs_dir2_block;
+struct xfs_inode;
+struct xfs_mount;
+struct xfs_trans;
+
+/*
+ * Maximum size of a shortform directory.
+ */
+#define	XFS_DIR2_SF_MAX_SIZE	\
+	(XFS_DINODE_MAX_SIZE - (uint)sizeof(xfs_dinode_core_t) - \
+	 (uint)sizeof(xfs_agino_t))
+
+/*
+ * Inode number stored as 8 8-bit values.
+ */
+typedef	struct { __uint8_t i[8]; } xfs_dir2_ino8_t;
+
+#define	XFS_DIR2_SF_GET_INO8_ARCH(di,arch)	\
+	(xfs_ino_t)(DIRINO_GET_ARCH(&di,arch))
+#define	XFS_DIR2_SF_GET_INO8(di)	        \
+	XFS_DIR2_SF_GET_INO8_ARCH(di,ARCH_NOCONVERT)
+
+/*
+ * Inode number stored as 4 8-bit values.
+ * Works a lot of the time, when all the inode numbers in a directory
+ * fit in 32 bits.
+ */
+typedef struct { __uint8_t i[4]; } xfs_dir2_ino4_t;
+#define	XFS_DIR2_SF_GET_INO4_ARCH(di,arch)	\
+	(xfs_ino_t)(DIRINO4_GET_ARCH(&di,arch))
+#define	XFS_DIR2_SF_GET_INO4(di)	        \
+	XFS_DIR2_SF_GET_INO4_ARCH(di,ARCH_NOCONVERT)
+
+typedef union {
+	xfs_dir2_ino8_t	i8;
+	xfs_dir2_ino4_t	i4;
+} xfs_dir2_inou_t;
+#define	XFS_DIR2_MAX_SHORT_INUM	((xfs_ino_t)0xffffffffULL)
+
+/*
+ * Normalized offset (in a data block) of the entry, really xfs_dir2_data_off_t.
+ * Only need 16 bits, this is the byte offset into the single block form.
+ */
+typedef struct { __uint8_t i[2]; } xfs_dir2_sf_off_t;
+
+/*
+ * The parent directory has a dedicated field, and the self-pointer must
+ * be calculated on the fly.
+ *
+ * Entries are packed toward the top as tightly as possible.  The header
+ * and the elements must be memcpy'd out into a work area to get correct
+ * alignment for the inode number fields.
+ */
+typedef struct xfs_dir2_sf_hdr {
+	__uint8_t		count;		/* count of entries */
+	__uint8_t		i8count;	/* count of 8-byte inode #s */
+	xfs_dir2_inou_t		parent;		/* parent dir inode number */
+} xfs_dir2_sf_hdr_t;
+
+typedef struct xfs_dir2_sf_entry {
+	__uint8_t		namelen;	/* actual name length */
+	xfs_dir2_sf_off_t	offset;		/* saved offset */
+	__uint8_t		name[1];	/* name, variable size */
+	xfs_dir2_inou_t		inumber;	/* inode number, var. offset */
+} xfs_dir2_sf_entry_t;
+
+typedef struct xfs_dir2_sf {
+	xfs_dir2_sf_hdr_t	hdr;		/* shortform header */
+	xfs_dir2_sf_entry_t	list[1];	/* shortform entries */
+} xfs_dir2_sf_t;
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_HDR_SIZE)
+int xfs_dir2_sf_hdr_size(int i8count);
+#define	XFS_DIR2_SF_HDR_SIZE(i8count)	xfs_dir2_sf_hdr_size(i8count)
+#else
+#define	XFS_DIR2_SF_HDR_SIZE(i8count)	\
+	((uint)sizeof(xfs_dir2_sf_hdr_t) - \
+	 ((i8count) == 0) * \
+	 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_INUMBERP)
+xfs_dir2_inou_t *xfs_dir2_sf_inumberp(xfs_dir2_sf_entry_t *sfep);
+#define	XFS_DIR2_SF_INUMBERP(sfep)	xfs_dir2_sf_inumberp(sfep)
+#else
+#define	XFS_DIR2_SF_INUMBERP(sfep)	\
+	((xfs_dir2_inou_t *)&(sfep)->name[(sfep)->namelen])
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_GET_INUMBER)
+xfs_intino_t xfs_dir2_sf_get_inumber_arch(xfs_dir2_sf_t *sfp, xfs_dir2_inou_t *from,
+					    xfs_arch_t arch);
+#define	XFS_DIR2_SF_GET_INUMBER_ARCH(sfp, from, arch)	\
+	xfs_dir2_sf_get_inumber_arch(sfp, from, arch)
+
+#else
+#define	XFS_DIR2_SF_GET_INUMBER_ARCH(sfp, from, arch)	\
+	((sfp)->hdr.i8count == 0 ? \
+		(xfs_intino_t)XFS_DIR2_SF_GET_INO4_ARCH(*(from), arch) : \
+		(xfs_intino_t)XFS_DIR2_SF_GET_INO8_ARCH(*(from), arch))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_PUT_INUMBER)
+void xfs_dir2_sf_put_inumber_arch(xfs_dir2_sf_t *sfp, xfs_ino_t *from,
+				     xfs_dir2_inou_t *to, xfs_arch_t arch);
+#define	XFS_DIR2_SF_PUT_INUMBER_ARCH(sfp,from,to,arch)	\
+	xfs_dir2_sf_put_inumber_arch(sfp,from,to,arch)
+#else
+#define	XFS_DIR2_SF_PUT_INUMBER_ARCH(sfp,from,to,arch)	\
+	if ((sfp)->hdr.i8count == 0) { \
+	    DIRINO4_COPY_ARCH(from,to,arch); \
+	} else { \
+	    DIRINO_COPY_ARCH(from,to,arch); \
+	}
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_GET_OFFSET)
+xfs_dir2_data_aoff_t xfs_dir2_sf_get_offset_arch(xfs_dir2_sf_entry_t *sfep,
+						    xfs_arch_t arch);
+xfs_dir2_data_aoff_t xfs_dir2_sf_get_offset(xfs_dir2_sf_entry_t *sfep);
+#define	XFS_DIR2_SF_GET_OFFSET_ARCH(sfep,arch)	\
+	xfs_dir2_sf_get_offset_arch(sfep,arch)
+#else
+#define	XFS_DIR2_SF_GET_OFFSET_ARCH(sfep,arch)	\
+	INT_GET_UNALIGNED_16_ARCH(&(sfep)->offset.i,arch)
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_PUT_OFFSET)
+void xfs_dir2_sf_put_offset_arch(xfs_dir2_sf_entry_t *sfep,
+				    xfs_dir2_data_aoff_t off, xfs_arch_t arch);
+#define	XFS_DIR2_SF_PUT_OFFSET_ARCH(sfep,off,arch) \
+	xfs_dir2_sf_put_offset_arch(sfep,off,arch)
+#else
+#define	XFS_DIR2_SF_PUT_OFFSET_ARCH(sfep,off,arch)	\
+	INT_SET_UNALIGNED_16_ARCH(&(sfep)->offset.i,off,arch)
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_ENTSIZE_BYNAME)
+int xfs_dir2_sf_entsize_byname(xfs_dir2_sf_t *sfp, int len);
+#define XFS_DIR2_SF_ENTSIZE_BYNAME(sfp,len)	\
+	xfs_dir2_sf_entsize_byname(sfp,len)
+#else
+#define XFS_DIR2_SF_ENTSIZE_BYNAME(sfp,len)	/* space a name uses */ \
+	((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (len) - \
+	 ((sfp)->hdr.i8count == 0) * \
+	 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_ENTSIZE_BYENTRY)
+int xfs_dir2_sf_entsize_byentry(xfs_dir2_sf_t *sfp, xfs_dir2_sf_entry_t *sfep);
+#define XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep)	\
+	xfs_dir2_sf_entsize_byentry(sfp,sfep)
+#else
+#define XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep)	/* space an entry uses */ \
+	((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (sfep)->namelen - \
+	 ((sfp)->hdr.i8count == 0) * \
+	 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_FIRSTENTRY)
+xfs_dir2_sf_entry_t *xfs_dir2_sf_firstentry(xfs_dir2_sf_t *sfp);
+#define XFS_DIR2_SF_FIRSTENTRY(sfp)	xfs_dir2_sf_firstentry(sfp)
+#else
+#define XFS_DIR2_SF_FIRSTENTRY(sfp)	/* first entry in struct */ \
+	((xfs_dir2_sf_entry_t *) \
+	 ((char *)(sfp) + XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)))
+#endif
+
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_NEXTENTRY)
+xfs_dir2_sf_entry_t *xfs_dir2_sf_nextentry(xfs_dir2_sf_t *sfp,
+					   xfs_dir2_sf_entry_t *sfep);
+#define XFS_DIR2_SF_NEXTENTRY(sfp,sfep)		xfs_dir2_sf_nextentry(sfp,sfep)
+#else
+#define XFS_DIR2_SF_NEXTENTRY(sfp,sfep)		/* next entry in struct */ \
+	((xfs_dir2_sf_entry_t *) \
+		((char *)(sfep) + XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep)))
+#endif
+
+/*
+ * Functions.
+ */
+
+extern int
+	xfs_dir2_block_sfsize(struct xfs_inode *dp,
+			      struct xfs_dir2_block *block,
+			      xfs_dir2_sf_hdr_t *sfhp);
+
+extern int
+	xfs_dir2_block_to_sf(struct xfs_da_args *args, struct xfs_dabuf *bp,
+			     int size, xfs_dir2_sf_hdr_t *sfhp);
+
+extern int
+	xfs_dir2_sf_addname(struct xfs_da_args *args);
+
+extern int
+	xfs_dir2_sf_create(struct xfs_da_args *args, xfs_ino_t pino);
+
+extern int
+	xfs_dir2_sf_getdents(struct xfs_inode *dp, struct uio *uio, int *eofp,
+			     struct xfs_dirent *dbp, xfs_dir2_put_t put);
+
+extern int
+	xfs_dir2_sf_lookup(struct xfs_da_args *args);
+
+extern int
+	xfs_dir2_sf_removename(struct xfs_da_args *args);
+
+extern int
+	xfs_dir2_sf_replace(struct xfs_da_args *args);
+
+#endif	/* __XFS_DIR2_SF_H__ */