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authorPhilipp Reisner <philipp.reisner@linbit.com>2016-06-14 00:26:15 +0200
committerJens Axboe <axboe@fb.com>2016-06-14 05:43:04 +0200
commit92d94ae66aebda5e4832d96e96b95117c44693b5 (patch)
tree08266c08a393aa5ca014d38d9813f61f74f5ae81 /drivers/block/drbd
parentdrbd: Introduce new disk config option rs-discard-granularity (diff)
downloadlinux-92d94ae66aebda5e4832d96e96b95117c44693b5.tar.xz
linux-92d94ae66aebda5e4832d96e96b95117c44693b5.zip
drbd: Create the protocol feature THIN_RESYNC
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>
Diffstat (limited to 'drivers/block/drbd')
-rw-r--r--drivers/block/drbd/drbd_protocol.h1
-rw-r--r--drivers/block/drbd/drbd_receiver.c5
-rw-r--r--drivers/block/drbd/drbd_worker.c13
3 files changed, 17 insertions, 2 deletions
diff --git a/drivers/block/drbd/drbd_protocol.h b/drivers/block/drbd/drbd_protocol.h
index ce0e72ca47ec..95ca4586af59 100644
--- a/drivers/block/drbd/drbd_protocol.h
+++ b/drivers/block/drbd/drbd_protocol.h
@@ -165,6 +165,7 @@ struct p_block_req {
*/
#define FF_TRIM 1
+#define FF_THIN_RESYNC 2
struct p_connection_features {
u32 protocol_min;
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index f5eef97ec47d..a50cc99aaf3b 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -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:
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index dd85433315d2..154dbfc61aff 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -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");