dm thin: emit ignore_discard in status when discards disabled

If "ignore_discard" is specified when creating the thin pool device then
discard support is disabled for that device.  The pool device's status
should reflect this fact rather than stating "no_discard_passdown"
(which implies discards are enabled but passdown is disabled).

Reported-by: Zdenek Kabelac <zkabelac@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index aeb9e20..063fe04 100644 (file)
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2391,7 +2391,9 @@ static int pool_status(struct dm_target *ti, status_type_t type,
                else
                        DMEMIT("rw ");
 
-               if (pool->pf.discard_enabled && pool->pf.discard_passdown)
+               if (!pool->pf.discard_enabled)
+                       DMEMIT("ignore_discard");
+               else if (pool->pf.discard_passdown)
                        DMEMIT("discard_passdown");
                else
                        DMEMIT("no_discard_passdown");
@@ -2487,7 +2489,7 @@ static struct target_type pool_target = {
        .name = "thin-pool",
        .features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE |
                    DM_TARGET_IMMUTABLE,
-       .version = {1, 5, 0},
+       .version = {1, 6, 0},
        .module = THIS_MODULE,
        .ctr = pool_ctr,
        .dtr = pool_dtr,