diff options
| author | Lars Ellenberg <lars@linbit.com> | 2016-06-14 01:26:31 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-06-14 06:43:07 +0300 |
| commit | 9104d31a759fbade8505f38f92f4dde719957826 (patch) | |
| tree | ad71e3ed1cbb0a096fae43d8a48db469b8ff4761 /drivers/block/drbd/drbd_req.c | |
| parent | 60bac040129720837770d0d852cf71dccbc69f61 (diff) | |
| download | linux-9104d31a759fbade8505f38f92f4dde719957826.tar.xz | |
drbd: introduce WRITE_SAME support
We will support WRITE_SAME, if
* all peers support WRITE_SAME (both in kernel and DRBD version),
* all peer devices support WRITE_SAME
* logical_block_size is identical on all peers.
We may at some point introduce a fallback on the receiving side
for devices/kernels that do not support WRITE_SAME,
by open-coding a submit loop. But not yet.
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_req.c')
| -rw-r--r-- | drivers/block/drbd/drbd_req.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c index 68151271fc5f..a8994875d52b 100644 --- a/drivers/block/drbd/drbd_req.c +++ b/drivers/block/drbd/drbd_req.c @@ -47,8 +47,7 @@ static void _drbd_end_io_acct(struct drbd_device *device, struct drbd_request *r &device->vdisk->part0, req->start_jif); } -static struct drbd_request *drbd_req_new(struct drbd_device *device, - struct bio *bio_src) +static struct drbd_request *drbd_req_new(struct drbd_device *device, struct bio *bio_src) { struct drbd_request *req; @@ -58,10 +57,12 @@ static struct drbd_request *drbd_req_new(struct drbd_device *device, memset(req, 0, sizeof(*req)); drbd_req_make_private_bio(req, bio_src); - req->rq_state = bio_data_dir(bio_src) == WRITE ? RQ_WRITE : 0; - req->device = device; - req->master_bio = bio_src; - req->epoch = 0; + req->rq_state = (bio_data_dir(bio_src) == WRITE ? RQ_WRITE : 0) + | (bio_op(bio_src) == REQ_OP_WRITE_SAME ? RQ_WSAME : 0) + | (bio_op(bio_src) == REQ_OP_DISCARD ? RQ_UNMAP : 0); + req->device = device; + req->master_bio = bio_src; + req->epoch = 0; drbd_clear_interval(&req->i); req->i.sector = bio_src->bi_iter.bi_sector; |