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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_dir.h
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+/*
+ * 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_DIR_H__
+#define __XFS_DIR_H__
+
+/*
+ * Large directories are structured around Btrees where all the data
+ * elements are in the leaf nodes. Filenames are hashed into an int,
+ * then that int is used as the index into the Btree. Since the hashval
+ * of a filename may not be unique, we may have duplicate keys. The
+ * internal links in the Btree are logical block offsets into the file.
+ *
+ * Small directories use a different format and are packed as tightly
+ * as possible so as to fit into the literal area of the inode.
+ */
+
+/*========================================================================
+ * Function prototypes for the kernel.
+ *========================================================================*/
+
+struct uio;
+struct xfs_bmap_free;
+struct xfs_da_args;
+struct xfs_dinode;
+struct xfs_inode;
+struct xfs_mount;
+struct xfs_trans;
+
+/*
+ * Directory function types.
+ * Put in structures (xfs_dirops_t) for v1 and v2 directories.
+ */
+typedef void (*xfs_dir_mount_t)(struct xfs_mount *mp);
+typedef int (*xfs_dir_isempty_t)(struct xfs_inode *dp);
+typedef int (*xfs_dir_init_t)(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ struct xfs_inode *pdp);
+typedef int (*xfs_dir_createname_t)(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ char *name,
+ int namelen,
+ xfs_ino_t inum,
+ xfs_fsblock_t *first,
+ struct xfs_bmap_free *flist,
+ xfs_extlen_t total);
+typedef int (*xfs_dir_lookup_t)(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ char *name,
+ int namelen,
+ xfs_ino_t *inum);
+typedef int (*xfs_dir_removename_t)(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ char *name,
+ int namelen,
+ xfs_ino_t ino,
+ xfs_fsblock_t *first,
+ struct xfs_bmap_free *flist,
+ xfs_extlen_t total);
+typedef int (*xfs_dir_getdents_t)(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ struct uio *uio,
+ int *eofp);
+typedef int (*xfs_dir_replace_t)(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ char *name,
+ int namelen,
+ xfs_ino_t inum,
+ xfs_fsblock_t *first,
+ struct xfs_bmap_free *flist,
+ xfs_extlen_t total);
+typedef int (*xfs_dir_canenter_t)(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ char *name,
+ int namelen);
+typedef int (*xfs_dir_shortform_validate_ondisk_t)(struct xfs_mount *mp,
+ struct xfs_dinode *dip);
+typedef int (*xfs_dir_shortform_to_single_t)(struct xfs_da_args *args);
+
+typedef struct xfs_dirops {
+ xfs_dir_mount_t xd_mount;
+ xfs_dir_isempty_t xd_isempty;
+ xfs_dir_init_t xd_init;
+ xfs_dir_createname_t xd_createname;
+ xfs_dir_lookup_t xd_lookup;
+ xfs_dir_removename_t xd_removename;
+ xfs_dir_getdents_t xd_getdents;
+ xfs_dir_replace_t xd_replace;
+ xfs_dir_canenter_t xd_canenter;
+ xfs_dir_shortform_validate_ondisk_t xd_shortform_validate_ondisk;
+ xfs_dir_shortform_to_single_t xd_shortform_to_single;
+} xfs_dirops_t;
+
+/*
+ * Overall external interface routines.
+ */
+void xfs_dir_startup(void); /* called exactly once */
+
+#define XFS_DIR_MOUNT(mp) \
+ ((mp)->m_dirops.xd_mount(mp))
+#define XFS_DIR_ISEMPTY(mp,dp) \
+ ((mp)->m_dirops.xd_isempty(dp))
+#define XFS_DIR_INIT(mp,tp,dp,pdp) \
+ ((mp)->m_dirops.xd_init(tp,dp,pdp))
+#define XFS_DIR_CREATENAME(mp,tp,dp,name,namelen,inum,first,flist,total) \
+ ((mp)->m_dirops.xd_createname(tp,dp,name,namelen,inum,first,flist,\
+ total))
+#define XFS_DIR_LOOKUP(mp,tp,dp,name,namelen,inum) \
+ ((mp)->m_dirops.xd_lookup(tp,dp,name,namelen,inum))
+#define XFS_DIR_REMOVENAME(mp,tp,dp,name,namelen,ino,first,flist,total) \
+ ((mp)->m_dirops.xd_removename(tp,dp,name,namelen,ino,first,flist,total))
+#define XFS_DIR_GETDENTS(mp,tp,dp,uio,eofp) \
+ ((mp)->m_dirops.xd_getdents(tp,dp,uio,eofp))
+#define XFS_DIR_REPLACE(mp,tp,dp,name,namelen,inum,first,flist,total) \
+ ((mp)->m_dirops.xd_replace(tp,dp,name,namelen,inum,first,flist,total))
+#define XFS_DIR_CANENTER(mp,tp,dp,name,namelen) \
+ ((mp)->m_dirops.xd_canenter(tp,dp,name,namelen))
+#define XFS_DIR_SHORTFORM_VALIDATE_ONDISK(mp,dip) \
+ ((mp)->m_dirops.xd_shortform_validate_ondisk(mp,dip))
+#define XFS_DIR_SHORTFORM_TO_SINGLE(mp,args) \
+ ((mp)->m_dirops.xd_shortform_to_single(args))
+
+#define XFS_DIR_IS_V1(mp) ((mp)->m_dirversion == 1)
+extern xfs_dirops_t xfsv1_dirops;
+
+#endif /* __XFS_DIR_H__ */
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