[nfs-utils PATCH] mount.nfs: don't parse "device" name for -o remount

[NeilBrown <neilb@suse.com>]

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When "-o remount" is used, the device/special name
is ignored.  So don't parse it and risk generating a
useless error.

This is particularly important when nfs-root is used
as the "device name" is listed as "/dev/nfs".
Because mount.nfs doesn't think that is valid,
  mount -o remount,rw /
will fail.

Link: https://github.com/systemd/systemd/issues/3590
Signed-off-by: NeilBrown <neilb@suse.com>
---
 utils/mount/stropts.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c
index 440131482e2b..12178235f068 100644
--- a/utils/mount/stropts.c
+++ b/utils/mount/stropts.c
@@ -384,7 +384,9 @@ static int nfs_set_version(struct nfsmount_info *mi)
  */
 static int nfs_validate_options(struct nfsmount_info *mi)
 {
-	if (!nfs_parse_devname(mi->spec, &mi->hostname, NULL))
+	/* For remount, ignore mi->spec: the kernel will. */
+	if (!(mi->flags & MS_REMOUNT) &&
+	    !nfs_parse_devname(mi->spec, &mi->hostname, NULL))
 		return 0;
 
 	if (!nfs_nfs_proto_family(mi->options, &mi->family))
-- 
2.14.0.rc0.dirty


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