[Patch fuse] fusefs_link return code

[Helg]

This patch fixes a bug where fusefs_link does not return an error on
subsequent invocations if a fuse filesystem does not implement hard
links.

As an aside, returning ENOSYS in this case is contrary to the link(2)
man page (and different again to the Open Group) but consistent with
the fuse implementation on Linux.

-- 
Helg <xx...@msn.com>


Index: fuse_vnops.c
===================================================================
RCS file: /cvs/src/sys/miscfs/fuse/fuse_vnops.c,v
retrieving revision 1.16
diff -u -p -r1.16 fuse_vnops.c
--- fuse_vnops.c        18 Mar 2014 08:51:53 -0000      1.16
+++ fuse_vnops.c        4 May 2014 06:32:50 -0000
@@ -540,8 +540,10 @@ fusefs_link(void *v)
        dip = VTOI(dvp);
        fmp = (struct fusefs_mnt *)ip->ufs_ino.i_ump;
 
-       if (!fmp->sess_init || (fmp->undef_op & UNDEF_LINK))
+       if (!fmp->sess_init || (fmp->undef_op & UNDEF_LINK)) {
+               error = ENOSYS;
                goto out1;
+       }
 
        fbuf = fb_setup(cnp->cn_namelen + 1, dip->ufs_ino.i_number,
            FBT_LINK, p);