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authorMikulas Patocka <mpatocka@redhat.com>2015-02-12 10:09:20 -0500
committerMike Snitzer <snitzer@redhat.com>2015-02-13 19:50:46 -0500
commitf2ed51ac64611d717d1917820a01930174c2f236 (patch)
tree726e3cf40cb8f128e0b9807f05fc255795c4454d /drivers/md/dm-raid1.c
parent145b9006a0ae753582902170ec1da49f89501845 (diff)
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dm mirror: do not degrade the mirror on discard error
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> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/md/dm-raid1.c')
-rw-r--r--drivers/md/dm-raid1.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 7dfdb5c746d6..089d62751f7f 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -604,6 +604,15 @@ 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);