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xfs: new export ops

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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>
This commit is contained in:
Christoph Hellwig
2007-10-21 16:42:11 -07:00
committed by Linus Torvalds
parent a35132068a
commit c38344fe9e
2 changed files with 130 additions and 124 deletions
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50
fs/xfs/linux-2.6/xfs_export.h
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@@ -59,50 +59,14 @@
* 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 */
/* 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_fid_t structure. Advances and
* returns the new data pointer
*/
static inline __u32 *
xfs_fileid_decode_fid2(__u32 *p, xfs_fid_t *fid, int is64)
{
fid->fid_len = sizeof(xfs_fid_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__ */