109 lines
2.9 KiB
C
109 lines
2.9 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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/* 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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/* Calculate the length in u32 units of the fileid data */
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static inline int
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xfs_fileid_length(int hasparent, int is64)
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{
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return hasparent ? (is64 ? 6 : 4) : (is64 ? 3 : 2);
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}
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/*
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* Decode encoded inode information (either for the inode itself
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* or the parent) into an xfs_fid2_t structure. Advances and
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* returns the new data pointer
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*/
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static inline __u32 *
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xfs_fileid_decode_fid2(__u32 *p, xfs_fid2_t *fid, int is64)
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{
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fid->fid_len = sizeof(xfs_fid2_t) - sizeof(fid->fid_len);
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fid->fid_pad = 0;
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fid->fid_ino = *p++;
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#if XFS_BIG_INUMS
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if (is64)
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fid->fid_ino |= (((__u64)(*p++)) << 32);
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#endif
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fid->fid_gen = *p++;
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return p;
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}
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/*
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* Encode inode information (either for the inode itself or the
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* parent) into a fileid buffer. Advances and returns the new
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* data pointer.
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*/
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static inline __u32 *
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xfs_fileid_encode_inode(__u32 *p, struct inode *inode, int is64)
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{
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*p++ = (__u32)inode->i_ino;
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#if XFS_BIG_INUMS
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if (is64)
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*p++ = (__u32)(inode->i_ino >> 32);
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#endif
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*p++ = inode->i_generation;
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return p;
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}
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#endif /* __XFS_EXPORT_H__ */
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