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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/linux-2.6/xfs_export.h
downloadlinux-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
linux-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
Linux-2.6.12-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) 2005 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_EXPORT_H__
+#define __XFS_EXPORT_H__
+
+/*
+ * Common defines for code related to exporting XFS filesystems over NFS.
+ *
+ * The NFS fileid goes out on the wire as an array of
+ * 32bit unsigned ints in host order. There are 5 possible
+ * formats.
+ *
+ * (1) fileid_type=0x00
+ * (no fileid data; handled by the generic code)
+ *
+ * (2) fileid_type=0x01
+ * inode-num
+ * generation
+ *
+ * (3) fileid_type=0x02
+ * inode-num
+ * generation
+ * parent-inode-num
+ * parent-generation
+ *
+ * (4) fileid_type=0x81
+ * inode-num-lo32
+ * inode-num-hi32
+ * generation
+ *
+ * (5) fileid_type=0x82
+ * inode-num-lo32
+ * inode-num-hi32
+ * generation
+ * parent-inode-num-lo32
+ * parent-inode-num-hi32
+ * parent-generation
+ *
+ * Note, the NFS filehandle also includes an fsid portion which
+ * may have an inode number in it. That number is hardcoded to
+ * 32bits and there is no way for XFS to intercept it. In
+ * practice this means when exporting an XFS filesytem with 64bit
+ * inodes you should either export the mountpoint (rather than
+ * a subdirectory) or use the "fsid" export option.
+ */
+
+/* This flag goes on the wire. Don't play with it. */
+#define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */
+
+/* Calculate the length in u32 units of the fileid data */
+static inline int
+xfs_fileid_length(int hasparent, int is64)
+{
+ return hasparent ? (is64 ? 6 : 4) : (is64 ? 3 : 2);
+}
+
+/*
+ * Decode encoded inode information (either for the inode itself
+ * or the parent) into an xfs_fid2_t structure. Advances and
+ * returns the new data pointer
+ */
+static inline __u32 *
+xfs_fileid_decode_fid2(__u32 *p, xfs_fid2_t *fid, int is64)
+{
+ fid->fid_len = sizeof(xfs_fid2_t) - sizeof(fid->fid_len);
+ fid->fid_pad = 0;
+ fid->fid_ino = *p++;
+#if XFS_BIG_INUMS
+ if (is64)
+ fid->fid_ino |= (((__u64)(*p++)) << 32);
+#endif
+ fid->fid_gen = *p++;
+ return p;
+}
+
+/*
+ * Encode inode information (either for the inode itself or the
+ * parent) into a fileid buffer. Advances and returns the new
+ * data pointer.
+ */
+static inline __u32 *
+xfs_fileid_encode_inode(__u32 *p, struct inode *inode, int is64)
+{
+ *p++ = (__u32)inode->i_ino;
+#if XFS_BIG_INUMS
+ if (is64)
+ *p++ = (__u32)(inode->i_ino >> 32);
+#endif
+ *p++ = inode->i_generation;
+ return p;
+}
+
+#endif /* __XFS_EXPORT_H__ */