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authorChristoph Hellwig <hch@lst.de>2007-10-21 19:42:11 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-22 11:13:20 -0400
commitc38344fe9e73c99d546cc15a2bb97c7a09942aad (patch)
tree83d3cb3f57367ef934fd751e01ff0e11a21bf5e5 /fs/xfs/linux-2.6/xfs_export.h
parenta35132068a91907c29328abc3156d31e50673412 (diff)
xfs: new export ops
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>
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_export.h')
-rw-r--r--fs/xfs/linux-2.6/xfs_export.h50
1 files changed, 7 insertions, 43 deletions
diff --git a/fs/xfs/linux-2.6/xfs_export.h b/fs/xfs/linux-2.6/xfs_export.h
index 2f36071a86f7..3272b6ae7a35 100644
--- a/fs/xfs/linux-2.6/xfs_export.h
+++ b/fs/xfs/linux-2.6/xfs_export.h
@@ -59,50 +59,14 @@
59 * a subdirectory) or use the "fsid" export option. 59 * a subdirectory) or use the "fsid" export option.
60 */ 60 */
61 61
62struct xfs_fid64 {
63 u64 ino;
64 u32 gen;
65 u64 parent_ino;
66 u32 parent_gen;
67} __attribute__((packed));
68
62/* This flag goes on the wire. Don't play with it. */ 69/* This flag goes on the wire. Don't play with it. */
63#define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */ 70#define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */
64 71
65/* Calculate the length in u32 units of the fileid data */
66static inline int
67xfs_fileid_length(int hasparent, int is64)
68{
69 return hasparent ? (is64 ? 6 : 4) : (is64 ? 3 : 2);
70}
71
72/*
73 * Decode encoded inode information (either for the inode itself
74 * or the parent) into an xfs_fid_t structure. Advances and
75 * returns the new data pointer
76 */
77static inline __u32 *
78xfs_fileid_decode_fid2(__u32 *p, xfs_fid_t *fid, int is64)
79{
80 fid->fid_len = sizeof(xfs_fid_t) - sizeof(fid->fid_len);
81 fid->fid_pad = 0;
82 fid->fid_ino = *p++;
83#if XFS_BIG_INUMS
84 if (is64)
85 fid->fid_ino |= (((__u64)(*p++)) << 32);
86#endif
87 fid->fid_gen = *p++;
88 return p;
89}
90
91/*
92 * Encode inode information (either for the inode itself or the
93 * parent) into a fileid buffer. Advances and returns the new
94 * data pointer.
95 */
96static inline __u32 *
97xfs_fileid_encode_inode(__u32 *p, struct inode *inode, int is64)
98{
99 *p++ = (__u32)inode->i_ino;
100#if XFS_BIG_INUMS
101 if (is64)
102 *p++ = (__u32)(inode->i_ino >> 32);
103#endif
104 *p++ = inode->i_generation;
105 return p;
106}
107
108#endif /* __XFS_EXPORT_H__ */ 72#endif /* __XFS_EXPORT_H__ */