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drbd: zero-out partial unaligned discards on local backend

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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>
This commit is contained in:
Lars Ellenberg 2016-06-14 00:26:22 +02:00 committed by Jens Axboe
parent 69ba1ee936
commit 7435e9018f
2 changed files with 25 additions and 6 deletions
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2
drivers/block/drbd/drbd_int.h
View File

@ -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);

29
drivers/block/drbd/drbd_req.c
View File

@ -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)