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drbd: Fix completion of requests while the device is suspended

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In various places (E.g. CONNECTION_LOST_WHILE_PENDING) the
RQ_COMPLETION_SUSP mask is passed in the clear set to mod_rq_state().

The issue was that it tried to clear the RQ_COMPLETION_SUSP bit
out of the state mask first, and eventuelly set it afterwards,
in the drbd_req_put_completion_ref() function.

Fixed that by moving the reference getting out of
drbd_req_put_completion_ref() into the mod_rq_state(), before the place
where the extra reference might be put.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2012-08-14 11:28:52 +02:00
parent 715306f69d
commit 5af2e8ce2b
1 changed files with 6 additions and 12 deletions
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18
drivers/block/drbd/drbd_req.c
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@ -304,18 +304,6 @@ static int drbd_req_put_completion_ref(struct drbd_request *req, struct bio_and_
if (!atomic_sub_and_test(put, &req->completion_ref))
return 0;
if (drbd_suspended(mdev)) {
/* We do not allow completion while suspended. Re-get a
* reference, so whatever happens when this is resumed
* may put and complete. */
D_ASSERT(!(req->rq_state & RQ_COMPLETION_SUSP));
req->rq_state |= RQ_COMPLETION_SUSP;
atomic_inc(&req->completion_ref);
return 0;
}
/* else */
drbd_req_complete(req, m);
if (req->rq_state & RQ_POSTPONED) {
@ -338,6 +326,9 @@ static void mod_rq_state(struct drbd_request *req, struct bio_and_error *m,
int c_put = 0;
int k_put = 0;
if (drbd_suspended(mdev) && !((s | clear) & RQ_COMPLETION_SUSP))
set |= RQ_COMPLETION_SUSP;
/* apply */
req->rq_state &= ~clear;
@ -366,6 +357,9 @@ static void mod_rq_state(struct drbd_request *req, struct bio_and_error *m,
if (!(s & RQ_NET_SENT) && (set & RQ_NET_SENT))
atomic_add(req->i.size >> 9, &mdev->ap_in_flight);
if (!(s & RQ_COMPLETION_SUSP) && (set & RQ_COMPLETION_SUSP))
atomic_inc(&req->completion_ref);
/* progress: put references */
if ((s & RQ_COMPLETION_SUSP) && (clear & RQ_COMPLETION_SUSP))