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c6143911a7
Currently XFs has three different fid types: struct fid, struct xfs_fid and struct xfs_fid2 with hte latter two beeing identicaly and the first one beeing the same size but an unstructured array with the same size. This patch consolidates all this to alway uuse struct xfs_fid. This patch is required for an upcoming patch series from me that revamps the nfs exporting code and introduces a Linux-wide struct fid. SGI-PV: 970336 SGI-Modid: xfs-linux-melb:xfs-kern:29651a Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>
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_fid_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_fid_t *fid, int is64)
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{
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fid->fid_len = sizeof(xfs_fid_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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