mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 03:00:53 +07:00
7b71876980
boilerplate. SGI-PV: 913862 SGI-Modid: xfs-linux:xfs-kern:23903a Signed-off-by: Nathan Scott <nathans@sgi.com>
109 lines
2.9 KiB
C
109 lines
2.9 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 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__ */
|