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authorLars Ellenberg <lars.ellenberg@linbit.com>2012-09-22 12:26:57 +0200
committerJens Axboe <axboe@kernel.dk>2012-10-30 08:39:18 +0100
commita2a3c74f243d5d1793f89ccdceaa6918851f7fce (patch)
tree3d828d28daaabf6540e7a157454683a1a678524a /drivers/block/drbd/drbd_req.c
parent06f10adbdb027b225fd51584a218fa8344169514 (diff)
downloadvexpress-lsk-a2a3c74f243d5d1793f89ccdceaa6918851f7fce.tar.gz
drbd: always write bitmap on detach
If we detach due to local read-error (which sets a bit in the bitmap), stay Primary, and then re-attach (which re-reads the bitmap from disk), we potentially lost the "out-of-sync" (or, "bad block") information in the bitmap. Always (try to) write out the changed bitmap pages before going diskless. That way, we don't lose the bit for the bad block, the next resync will fetch it from the peer, and rewrite it locally, which may result in block reallocation in some lower layer (or the hardware), and thereby "heal" the bad blocks. If the bitmap writeout errors out as well, we will (again: try to) mark the "we need a full sync" bit in our super block, if it was a READ error; writes are covered by the activity log already. If that superblock does not make it to disk either, we are sorry. Maybe we just lost an entire disk or controller (or iSCSI connection), and there actually are no bad blocks at all, so we don't need to re-fetch from the peer, there is no "auto-healing" necessary. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/drbd/drbd_req.c')
-rw-r--r--drivers/block/drbd/drbd_req.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 9220d9f9d6c..d9e5962a9a8 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -455,7 +455,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
req->rq_state |= RQ_LOCAL_COMPLETED;
req->rq_state &= ~RQ_LOCAL_PENDING;
- __drbd_chk_io_error(mdev, DRBD_IO_ERROR);
+ __drbd_chk_io_error(mdev, DRBD_WRITE_ERROR);
_req_may_be_done_not_susp(req, m);
break;
@@ -477,7 +477,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
break;
}
- __drbd_chk_io_error(mdev, DRBD_IO_ERROR);
+ __drbd_chk_io_error(mdev, DRBD_READ_ERROR);
goto_queue_for_net_read: