c38344fe9e
This one is a lot more complicated than the previous ones. XFS already had a very clever scheme for supporting 64bit inode numbers in filehandles, and I've reworked this to be some kind of a prototype for the generic 64bit inode filehandle support. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Neil Brown <neilb@suse.de> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: David Chinner <dgc@sgi.com> Cc: Timothy Shimmin <tes@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
73 lines
2 KiB
C
73 lines
2 KiB
C
/*
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* Copyright (c) 2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_EXPORT_H__
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#define __XFS_EXPORT_H__
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/*
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* Common defines for code related to exporting XFS filesystems over NFS.
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*
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* The NFS fileid goes out on the wire as an array of
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* 32bit unsigned ints in host order. There are 5 possible
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* formats.
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*
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* (1) fileid_type=0x00
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* (no fileid data; handled by the generic code)
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*
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* (2) fileid_type=0x01
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* inode-num
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* generation
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*
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* (3) fileid_type=0x02
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* inode-num
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* generation
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* parent-inode-num
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* parent-generation
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*
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* (4) fileid_type=0x81
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* inode-num-lo32
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* inode-num-hi32
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* generation
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*
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* (5) fileid_type=0x82
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* inode-num-lo32
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* inode-num-hi32
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* generation
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* parent-inode-num-lo32
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* parent-inode-num-hi32
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* parent-generation
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*
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* Note, the NFS filehandle also includes an fsid portion which
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* may have an inode number in it. That number is hardcoded to
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* 32bits and there is no way for XFS to intercept it. In
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* practice this means when exporting an XFS filesystem with 64bit
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* inodes you should either export the mountpoint (rather than
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* a subdirectory) or use the "fsid" export option.
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*/
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struct xfs_fid64 {
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u64 ino;
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u32 gen;
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u64 parent_ino;
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u32 parent_gen;
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} __attribute__((packed));
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/* This flag goes on the wire. Don't play with it. */
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#define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */
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#endif /* __XFS_EXPORT_H__ */
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