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| author | Lars Ellenberg <lars@linbit.com> | 2016-06-14 00:26:29 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-06-13 21:43:06 -0600 |
| commit | 65f5be3579a69c6a057eeb99620999788982bff6 (patch) | |
| tree | 116ce9c598cce7bc43b837e1e36e1fab0db35c52 | |
| parent | af61494ad4725ed78bd6b3f159a32463d80fdd60 (diff) | |
| download | blackbird-op-linux-65f5be3579a69c6a057eeb99620999788982bff6.tar.gz blackbird-op-linux-65f5be3579a69c6a057eeb99620999788982bff6.zip | |
drbd: discard_zeroes_if_aligned allows "thin" resync for discard_zeroes_data=0
Even if discard_zeroes_data != 0,
if discard_zeroes_if_aligned is set, we assume we can reliably
zero-out/discard using the drbd_issue_peer_discard() helper.
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>
| -rw-r--r-- | drivers/block/drbd/drbd_nl.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index e5fdcc6c2e67..169e3e15a30e 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -1408,9 +1408,12 @@ static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *dis if (disk_conf->al_extents > drbd_al_extents_max(nbc)) disk_conf->al_extents = drbd_al_extents_max(nbc); - if (!blk_queue_discard(q) || !q->limits.discard_zeroes_data) { - disk_conf->rs_discard_granularity = 0; /* disable feature */ - drbd_info(device, "rs_discard_granularity feature disabled\n"); + if (!blk_queue_discard(q) + || (!q->limits.discard_zeroes_data && !disk_conf->discard_zeroes_if_aligned)) { + if (disk_conf->rs_discard_granularity) { + disk_conf->rs_discard_granularity = 0; /* disable feature */ + drbd_info(device, "rs_discard_granularity feature disabled\n"); + } } if (disk_conf->rs_discard_granularity) { |
