dm mpath: reject messages when device is suspended

This patch rejects messages that can generate I/O while the device
itself is suspended.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Cc: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 45d9bf1..e81345a 100644 (file)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1433,6 +1433,11 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
                goto out;
        }
 
+       if (dm_suspended(ti)) {
+               r = -EBUSY;
+               goto out;
+       }
+
        if (argc == 1) {
                if (!strnicmp(argv[0], MESG_STR("queue_if_no_path"))) {
                        r = queue_if_no_path(m, 1, 0);