mount.nfs: Teach umount.nfs to recognize netids in /etc/mtab

umount.nfs has to detect the correct address family to use when
looking up the server.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

diff --git a/utils/mount/nfsumount.c b/utils/mount/nfsumount.c
index c5505b1edf6d436532f93310f0d2a433e70c19a2..9d798a2ff347513779b646b88692ae873844b158 100644 (file)
--- a/utils/mount/nfsumount.c
+++ b/utils/mount/nfsumount.c
@@ -169,10 +169,15 @@ out:
 static int nfs_umount_do_umnt(struct mount_options *options,
                              char **hostname, char **dirname)
 {
-       struct sockaddr_storage address;
-       struct sockaddr *sap = (struct sockaddr *)&address;
+       union {
+               struct sockaddr         sa;
+               struct sockaddr_in      s4;
+               struct sockaddr_in6     s6;
+       } address;
+       struct sockaddr *sap = &address.sa;
        socklen_t salen = sizeof(address);
        struct pmap nfs_pmap, mnt_pmap;
+       sa_family_t family;
 
        if (!nfs_options2pmap(options, &nfs_pmap, &mnt_pmap)) {
                nfs_error(_("%s: bad mount options"), progname);
@@ -189,8 +194,10 @@ static int nfs_umount_do_umnt(struct mount_options *options,
                return EX_FAIL;
        }
 
-       if (nfs_name_to_address(*hostname, sap, &salen) == 0)
-               /* nfs_name_to_address reports any errors */
+       if (!nfs_mount_proto_family(options, &family))
+               return 0;
+       if (!nfs_lookup(*hostname, family, sap, &salen))
+               /* nfs_lookup reports any errors */
                return EX_FAIL;
 
        if (nfs_advise_umount(sap, salen, &mnt_pmap, dirname) == 0)