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authorRonny Hegewald <ronny.hegewald@online.de>2015-10-15 18:50:46 +0000
committerIlya Dryomov <idryomov@gmail.com>2015-10-30 19:25:02 +0100
commitbae818ee1577c27356093901a0ea48f672eda514 (patch)
parent32b88194f71d6ae7768a29f87fbba454728273ee (diff)
rbd: require stable pages if message data CRCs are enabled
rbd requires stable pages, as it performs a crc of the page data before they are send to the OSDs. But since kernel 3.9 (patch 1d1d1a767206fbe5d4c69493b7e6d2a8d08cc0a0 "mm: only enforce stable page writes if the backing device requires it") it is not assumed anymore that block devices require stable pages. This patch sets the necessary flag to get stable pages back for rbd. In a ceph installation that provides multiple ext4 formatted rbd devices "bad crc" messages appeared regularly (ca 1 message every 1-2 minutes on every OSD that provided the data for the rbd) in the OSD-logs before this patch. After this patch this messages are pretty much gone (only ca 1-2 / month / OSD). Cc: stable@vger.kernel.org # 3.9+, needs backporting Signed-off-by: Ronny Hegewald <Ronny.Hegewald@online.de> [idryomov@gmail.com: require stable pages only in crc case, changelog] Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 6f26cf38c6f9..128e7df5b807 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3780,6 +3780,9 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE);
q->limits.discard_zeroes_data = 1;
+ if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC))
+ q->backing_dev_info.capabilities |= BDI_CAP_STABLE_WRITES;
disk->queue = q;
q->queuedata = rbd_dev;