nfsd: revert v2 half of "nfsd: don't return high mode bits"

commit 082f31a2169bd639785e45bf252f3d5bce0303c6 upstream.

This reverts the part of commit 6e14b46b91fee8a049b0940333ce13a820beaaa5
that changes NFSv2 behavior.

Mark Lord found that it broke nfs-root for Linux clients, because it
broke NFSv2.

In fact, from RFC 1094:

	"Notice that the file type is specified both in the mode bits
	and in the file type.  This is really a bug in the protocol and
	will be fixed in future versions."

So NFSv2 clients really are expected to depend on the high bits of the
mode.

Reported-by: Mark Lord <mlord@pobox.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Cc: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index b17d932..9c769a4 100644 (file)
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -152,7 +152,7 @@ encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
        type = (stat->mode & S_IFMT);
 
        *p++ = htonl(nfs_ftypes[type >> 12]);
-       *p++ = htonl((u32) (stat->mode & S_IALLUGO));
+       *p++ = htonl((u32) stat->mode);
        *p++ = htonl((u32) stat->nlink);
        *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
        *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));