diff options
Diffstat (limited to 'drivers/block/drbd/drbd_nl.c')
| -rw-r--r-- | drivers/block/drbd/drbd_nl.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index bfe1b0062d62..f2471172a961 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -1261,6 +1261,21 @@ static void fixup_discard_if_not_supported(struct request_queue *q) } } +static void fixup_write_zeroes(struct drbd_device *device, struct request_queue *q) +{ + /* Fixup max_write_zeroes_sectors after blk_queue_stack_limits(): + * if we can handle "zeroes" efficiently on the protocol, + * we want to do that, even if our backend does not announce + * max_write_zeroes_sectors itself. */ + struct drbd_connection *connection = first_peer_device(device)->connection; + /* If the peer announces WZEROES support, use it. Otherwise, rather + * send explicit zeroes than rely on some discard-zeroes-data magic. */ + if (connection->agreed_features & DRBD_FF_WZEROES) + q->limits.max_write_zeroes_sectors = DRBD_MAX_BBIO_SECTORS; + else + q->limits.max_write_zeroes_sectors = 0; +} + static void decide_on_write_same_support(struct drbd_device *device, struct request_queue *q, struct request_queue *b, struct o_qlim *o, @@ -1371,6 +1386,7 @@ static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backi } } fixup_discard_if_not_supported(q); + fixup_write_zeroes(device, q); } void drbd_reconsider_queue_parameters(struct drbd_device *device, struct drbd_backing_dev *bdev, struct o_qlim *o) |