fuse: set i_nlink to sane value after mount

Aufs seems to depend on a positive i_nlink value.  So fill in a dummy but sane
value for the root inode at mount time.

The inode attributes are refreshed with the correct values at the first
opportunity.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/fuse/inode.c

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index e8d360a..951e760 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -472,6 +472,7 @@
 
 	attr.mode = mode;
 	attr.ino = FUSE_ROOT_ID;
+	attr.nlink = 1;
 	return fuse_iget(sb, 1, 0, &attr);
 }