From 20c68fdea1646ed746abf19122d7699493927005 Mon Sep 17 00:00:00 2001 From: Lars Ellenberg Date: Mon, 28 Apr 2014 18:43:25 +0200 Subject: drbd: Enable QUEUE_FLAG_DISCARD only if the peer can recieve P_TRIM Allow the user of REQ_DISCARD. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg Signed-off-by: Jens Axboe --- drivers/block/drbd/drbd_int.h | 1 + drivers/block/drbd/drbd_nl.c | 20 ++++++++++++++++++++ drivers/block/drbd/drbd_protocol.h | 2 ++ drivers/block/drbd/drbd_receiver.c | 18 ++++++++++++++---- 4 files changed, 37 insertions(+), 4 deletions(-) (limited to 'drivers/block/drbd') diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index 29123dfb5f8..d5f39fda646 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -618,6 +618,7 @@ struct drbd_connection { struct drbd_socket data; /* data/barrier/cstate/parameter packets */ struct drbd_socket meta; /* ping/ack (metadata) packets */ int agreed_pro_version; /* actually used protocol version */ + u32 agreed_features; unsigned long last_received; /* in jiffies, either socket */ unsigned int ko_count; diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index bb3679263ea..2364b781d9a 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -1133,6 +1133,26 @@ static void drbd_setup_queue_param(struct drbd_device *device, unsigned int max_ if (get_ldev_if_state(device, D_ATTACHING)) { struct request_queue * const b = device->ldev->backing_bdev->bd_disk->queue; + struct drbd_connection *connection = first_peer_device(device)->connection; + + if (blk_queue_discard(b) && + (connection->cstate < C_CONNECTED || connection->agreed_features & FF_TRIM)) { + /* inherit from backing queue */ + q->limits.discard_zeroes_data = 1; + /* For now, don't allow more than one activity log extent worth of data + * to be discarded in one go. We may need to rework drbd_al_begin_io() + * to allow for even larger discard ranges */ + q->limits.max_discard_sectors = DRBD_MAX_DISCARD_SECTORS; + + queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); + /* REALLY? Is stacking secdiscard "legal"? */ + if (blk_queue_secdiscard(b)) + queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q); + } else { + q->limits.max_discard_sectors = 0; + queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); + queue_flag_clear_unlocked(QUEUE_FLAG_SECDISCARD, q); + } blk_queue_stack_limits(q, b); diff --git a/drivers/block/drbd/drbd_protocol.h b/drivers/block/drbd/drbd_protocol.h index 478c63d0b6f..2da9104a385 100644 --- a/drivers/block/drbd/drbd_protocol.h +++ b/drivers/block/drbd/drbd_protocol.h @@ -160,6 +160,8 @@ struct p_block_req { * ReportParams */ +#define FF_TRIM 1 + struct p_connection_features { u32 protocol_min; u32 feature_flags; diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 9640b645d5b..3fa3b78e2ea 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -46,9 +46,10 @@ #include "drbd_int.h" #include "drbd_protocol.h" #include "drbd_req.h" - #include "drbd_vli.h" +#define PRO_FEATURES (FF_TRIM) + struct packet_info { enum drbd_packet cmd; unsigned int size; @@ -3705,6 +3706,13 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info put_ldev(device); } + device->peer_max_bio_size = be32_to_cpu(p->max_bio_size); + drbd_reconsider_max_bio_size(device); + /* Leave drbd_reconsider_max_bio_size() before drbd_determine_dev_size(). + In case we cleared the QUEUE_FLAG_DISCARD from our queue in + drbd_reconsider_max_bio_size(), we can be sure that after + drbd_determine_dev_size() no REQ_DISCARDs are in the queue. */ + ddsf = be16_to_cpu(p->dds_flags); if (get_ldev(device)) { dd = drbd_determine_dev_size(device, ddsf, NULL); @@ -3717,9 +3725,6 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info drbd_set_my_capacity(device, p_size); } - device->peer_max_bio_size = be32_to_cpu(p->max_bio_size); - drbd_reconsider_max_bio_size(device); - if (get_ldev(device)) { if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev)) { device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev); @@ -4688,6 +4693,7 @@ static int drbd_send_features(struct drbd_connection *connection) memset(p, 0, sizeof(*p)); p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); + p->feature_flags = cpu_to_be32(PRO_FEATURES); return conn_send_command(connection, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); } @@ -4741,10 +4747,14 @@ static int drbd_do_features(struct drbd_connection *connection) goto incompat; connection->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); + connection->agreed_features = PRO_FEATURES & be32_to_cpu(p->feature_flags); drbd_info(connection, "Handshake successful: " "Agreed network protocol version %d\n", connection->agreed_pro_version); + drbd_info(connection, "Agreed to%ssupport TRIM on protocol level\n", + connection->agreed_features & FF_TRIM ? " " : " not "); + return 1; incompat: -- cgit v1.2.3-70-g09d2