diff options
| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2016-06-14 00:26:22 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-06-14 05:43:05 +0200 |
| commit | 7435e9018f9141e38d856229475335c8e757a497 (patch) | |
| tree | 9d2d238d551891578296bbeee33ac0818dcf88a7 /drivers/block | |
| parent | drbd: possibly disable discard support, if backend has discard_zeroes_data=0 (diff) | |
| download | linux-7435e9018f9141e38d856229475335c8e757a497.tar.xz linux-7435e9018f9141e38d856229475335c8e757a497.zip | |
drbd: zero-out partial unaligned discards on local backend
For consistency, also zero-out partial unaligned chunks of discard
requests on the local backend.
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')
| -rw-r--r-- | drivers/block/drbd/drbd_int.h | 2 | ||||
| -rw-r--r-- | drivers/block/drbd/drbd_req.c | 29 |
2 files changed, 25 insertions, 6 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index f49ff861bfd8..0b5a658882b2 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1553,6 +1553,8 @@ extern void start_resync_timer_fn(unsigned long data); extern void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req); /* drbd_receiver.c */ +extern int drbd_issue_discard_or_zero_out(struct drbd_device *device, + sector_t start, unsigned int nr_sectors, bool discard); extern int drbd_receiver(struct drbd_thread *thi); extern int drbd_ack_receiver(struct drbd_thread *thi); extern void drbd_send_ping_wf(struct work_struct *ws); diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c index 74903ab85ae9..355cf1064593 100644 --- a/drivers/block/drbd/drbd_req.c +++ b/drivers/block/drbd/drbd_req.c @@ -1156,6 +1156,16 @@ static int drbd_process_write_request(struct drbd_request *req) return remote; } +static void drbd_process_discard_req(struct drbd_request *req) +{ + int err = drbd_issue_discard_or_zero_out(req->device, + req->i.sector, req->i.size >> 9, true); + + if (err) + req->private_bio->bi_error = -EIO; + bio_endio(req->private_bio); +} + static void drbd_submit_req_private_bio(struct drbd_request *req) { @@ -1176,6 +1186,8 @@ drbd_submit_req_private_bio(struct drbd_request *req) : rw == READ ? DRBD_FAULT_DT_RD : DRBD_FAULT_DT_RA)) bio_io_error(bio); + else if (bio_op(bio) == REQ_OP_DISCARD) + drbd_process_discard_req(req); else generic_make_request(bio); put_ldev(device); @@ -1227,18 +1239,23 @@ drbd_request_prepare(struct drbd_device *device, struct bio *bio, unsigned long /* Update disk stats */ _drbd_start_io_acct(device, req); + /* process discards always from our submitter thread */ + if (bio_op(bio) & REQ_OP_DISCARD) + goto queue_for_submitter_thread; + if (rw == WRITE && req->private_bio && req->i.size && !test_bit(AL_SUSPENDED, &device->flags)) { - if (!drbd_al_begin_io_fastpath(device, &req->i)) { - atomic_inc(&device->ap_actlog_cnt); - drbd_queue_write(device, req); - return NULL; - } + if (!drbd_al_begin_io_fastpath(device, &req->i)) + goto queue_for_submitter_thread; req->rq_state |= RQ_IN_ACT_LOG; req->in_actlog_jif = jiffies; } - return req; + + queue_for_submitter_thread: + atomic_inc(&device->ap_actlog_cnt); + drbd_queue_write(device, req); + return NULL; } static void drbd_send_and_submit(struct drbd_device *device, struct drbd_request *req) |