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drbd: Create the protocol feature THIN_RESYNC

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If thinly provisioned volumes are used, during a resync the sync source
tries to find out if a block is deallocated. If it is deallocated, then
the resync target uses block_dev_issue_zeroout() on the range in
question.

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:
Philipp Reisner 2016-06-14 00:26:15 +02:00 committed by Jens Axboe
parent a5ca66c419
commit 92d94ae66a
3 changed files with 17 additions and 2 deletions
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1
drivers/block/drbd/drbd_protocol.h
View File

@ -165,6 +165,7 @@ struct p_block_req {
*/
#define FF_TRIM 1
#define FF_THIN_RESYNC 2
struct p_connection_features {
u32 protocol_min;

5
drivers/block/drbd/drbd_receiver.c
View File

@ -48,7 +48,7 @@
#include "drbd_req.h"
#include "drbd_vli.h"
#define PRO_FEATURES (FF_TRIM)
#define PRO_FEATURES (FF_TRIM | FF_THIN_RESYNC)
struct packet_info {
enum drbd_packet cmd;
@ -4991,6 +4991,9 @@ static int drbd_do_features(struct drbd_connection *connection)
drbd_info(connection, "Agreed to%ssupport TRIM on protocol level\n",
connection->agreed_features & FF_TRIM ? " " : " not ");
drbd_info(connection, "Agreed to%ssupport THIN_RESYNC on protocol level\n",
connection->agreed_features & FF_THIN_RESYNC ? " " : " not ");
return 1;
incompat:

13
drivers/block/drbd/drbd_worker.c
View File

@ -583,6 +583,7 @@ static int make_resync_request(struct drbd_device *const device, int cancel)
int number, rollback_i, size;
int align, requeue = 0;
int i = 0;
int discard_granularity = 0;
if (unlikely(cancel))
return 0;
@ -602,6 +603,12 @@ static int make_resync_request(struct drbd_device *const device, int cancel)
return 0;
}
if (connection->agreed_features & FF_THIN_RESYNC) {
rcu_read_lock();
discard_granularity = rcu_dereference(device->ldev->disk_conf)->rs_discard_granularity;
rcu_read_unlock();
}
max_bio_size = queue_max_hw_sectors(device->rq_queue) << 9;
number = drbd_rs_number_requests(device);
if (number <= 0)
@ -666,6 +673,9 @@ next_sector:
if (sector & ((1<<(align+3))-1))
break;
if (discard_granularity && size == discard_granularity)
break;
/* do not cross extent boundaries */
if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0)
break;
@ -712,7 +722,8 @@ next_sector:
int err;
inc_rs_pending(device);
err = drbd_send_drequest(peer_device, P_RS_DATA_REQUEST,
err = drbd_send_drequest(peer_device,
size == discard_granularity ? P_RS_THIN_REQ : P_RS_DATA_REQUEST,
sector, size, ID_SYNCER);
if (err) {
drbd_err(device, "drbd_send_drequest() failed, aborting...\n");