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| author | Philipp Reisner | 2016-06-14 00:26:15 +0200 |
|---|---|---|
| committer | Jens Axboe | 2016-06-14 05:43:04 +0200 |
| commit | 92d94ae66aebda5e4832d96e96b95117c44693b5 (patch) | |
| tree | 08266c08a393aa5ca014d38d9813f61f74f5ae81 /drivers/block/drbd/drbd_worker.c | |
| parent | drbd: Introduce new disk config option rs-discard-granularity (diff) | |
| download | kernel-qcow2-linux-92d94ae66aebda5e4832d96e96b95117c44693b5.tar.gz kernel-qcow2-linux-92d94ae66aebda5e4832d96e96b95117c44693b5.tar.xz kernel-qcow2-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/drbd_worker.c')
| -rw-r--r-- | drivers/block/drbd/drbd_worker.c | 13 |
1 files changed, 12 insertions, 1 deletions
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"); |