dm mirror: do not degrade the mirror on discard error

commit f2ed51ac64611d717d1917820a01930174c2f236 upstream.

It may be possible that a device claims discard support but it rejects
discards with -EOPNOTSUPP.  It happens when using loopback on ext2/ext3
filesystem driven by the ext4 driver.  It may also happen if the
underlying devices are moved from one disk on another.

If discard error happens, we reject the bio with -EOPNOTSUPP, but we do
not degrade the array.

This patch fixes failed test shell/lvconvert-repair-transient.sh in the
lvm2 testsuite if the testsuite is extracted on an ext2 or ext3
filesystem and it is being driven by the ext4 driver.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>

diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index a3cf259275af5be0f2469ea622e1695cfe20b544..3afb9cdbdd1452be95c385cc1301851af1f4faa9 100644 (file)
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -603,6 +603,15 @@ static void write_callback(unsigned long error, void *context)
                return;
        }
 
+       /*
+        * If the bio is discard, return an error, but do not
+        * degrade the array.
+        */
+       if (bio->bi_rw & REQ_DISCARD) {
+               bio_endio(bio, -EOPNOTSUPP);
+               return;
+       }
+
        for (i = 0; i < ms->nr_mirrors; i++)
                if (test_bit(i, &error))
                        fail_mirror(ms->mirror + i, DM_RAID1_WRITE_ERROR);