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drbd: change bitmap write-out when leaving resync states 

When leaving resync states because of disconnect,
do the bitmap write-out synchronously in the drbd_disconnected() path.

When leaving resync states because we go back to AHEAD/BEHIND, or
because resync actually finished, or some disk was lost during resync,
trigger the write-out from after_state_ch().

The bitmap write-out for resync -> ahead/behind was missing completely before.

Note that this is all only an optimization to avoid double-resyncs of
already completed blocks in case this node crashes.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Lars Ellenberg 2016-06-14 00:26:11 +02:00 committed by Jens Axboe
parent c0065f98d5
commit be115b69f1
2 changed files with 12 additions and 5 deletions
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8
drivers/block/drbd/drbd_receiver.c
View File

@ -4795,9 +4795,11 @@ static int drbd_disconnected(struct drbd_peer_device *peer_device)
drbd_md_sync(device);
/* serialize with bitmap writeout triggered by the state change,
* if any. */
wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
if (get_ldev(device)) {
drbd_bitmap_io(device, &drbd_bm_write_copy_pages,
"write from disconnected", BM_LOCKED_CHANGE_ALLOWED);
put_ldev(device);
}
/* tcp_close and release of sendpage pages can be deferred. I don't
* want to use SO_LINGER, because apparently it can be deferred for

9
drivers/block/drbd/drbd_state.c
View File

@ -1934,12 +1934,17 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
/* This triggers bitmap writeout of potentially still unwritten pages
* if the resync finished cleanly, or aborted because of peer disk
* failure, or because of connection loss.
* failure, or on transition from resync back to AHEAD/BEHIND.
*
* Connection loss is handled in drbd_disconnected() by the receiver.
*
* For resync aborted because of local disk failure, we cannot do
* any bitmap writeout anymore.
*
* No harm done if some bits change during this phase.
*/
if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(device)) {
if ((os.conn > C_CONNECTED && os.conn < C_AHEAD) &&
(ns.conn == C_CONNECTED || ns.conn >= C_AHEAD) && get_ldev(device)) {
drbd_queue_bitmap_io(device, &drbd_bm_write_copy_pages, NULL,
"write from resync_finished", BM_LOCKED_CHANGE_ALLOWED);
put_ldev(device);