[PATCH] knfsd: add some new fsid types

Add support for using a filesystem UUID to identify and export point in the
filehandle.

For NFSv2, this UUID is xor-ed down to 4 or 8 bytes so that it doesn't take up
too much room.  For NFSv3+, we use the full 16 bytes, and possibly also a
64bit inode number for exports beneath the root of a filesystem.

When generating an fsid to return in 'stat' information, use the UUID (hashed
down to size) if it is available and a small 'fsid' was not specifically
provided.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 12 deletions

diff --git a/include/linux/nfsd/nfsd.h b/include/linux/nfsd/nfsd.h
index 4b7c4b568f6d..72feac581aa3 100644
--- a/include/linux/nfsd/nfsd.h
+++ b/include/linux/nfsd/nfsd.h
@@ -254,18 +254,6 @@ void		nfsd_lockd_shutdown(void);
  */
 extern struct timeval   nfssvc_boot;
 
-static inline int is_fsid(struct svc_fh *fh, struct knfsd_fh *reffh)
-{
-        if (fh->fh_export->ex_flags & NFSEXP_FSID) {
-                struct vfsmount *mnt = fh->fh_export->ex_mnt;
-                if (!old_valid_dev(mnt->mnt_sb->s_dev) ||
-                    (reffh->fh_version == 1 && reffh->fh_fsid_type == 1))
-                        return 1;
-        }
-        return 0;
-}
-
-
 #ifdef CONFIG_NFSD_V4
 
 /* before processing a COMPOUND operation, we have to check that there