mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-30 08:04:13 +08:00
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
2.0 KiB
C
73 lines
2.0 KiB
C
/*
|
|
* 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 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. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#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 filesystem with 64bit
|
|
* inodes you should either export the mountpoint (rather than
|
|
* a subdirectory) or use the "fsid" export option.
|
|
*/
|
|
|
|
struct xfs_fid64 {
|
|
u64 ino;
|
|
u32 gen;
|
|
u64 parent_ino;
|
|
u32 parent_gen;
|
|
} __attribute__((packed));
|
|
|
|
/* This flag goes on the wire. Don't play with it. */
|
|
#define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */
|
|
|
|
#endif /* __XFS_EXPORT_H__ */
|