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OpenCloudOS-Kernel
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drbd: only start a new epoch, if the current epoch contains writes 

Almost all code paths calling start_new_tl_epoch() guarded it with
	if (... current_tle_writes > 0 ... ).
Just move that inside start_new_tl_epoch().

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2012-08-07 06:42:09 +02:00 committed by Philipp Reisner
parent 8a0bab2a6d
commit 99b4d8fe6d
1 changed files with 12 additions and 7 deletions
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19
drivers/block/drbd/drbd_req.c
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@ -162,6 +162,10 @@ static void wake_all_senders(struct drbd_tconn *tconn) {
/* must hold resource->req_lock */
static void start_new_tl_epoch(struct drbd_tconn *tconn)
{
/* no point closing an epoch, if it is empty, anyways. */
if (tconn->current_tle_writes == 0)
return;
tconn->current_tle_writes = 0;
atomic_inc(&tconn->current_tle_nr);
wake_all_senders(tconn);
@ -861,9 +865,8 @@ static void maybe_pull_ahead(struct drbd_conf *mdev)
}
if (congested) {
if (mdev->tconn->current_tle_writes)
/* start a new epoch for non-mirrored writes */
start_new_tl_epoch(mdev->tconn);
/* start a new epoch for non-mirrored writes */
start_new_tl_epoch(mdev->tconn);
if (on_congestion == OC_PULL_AHEAD)
_drbd_set_state(_NS(mdev, conn, C_AHEAD), 0, NULL);
@ -950,7 +953,7 @@ static int drbd_process_write_request(struct drbd_request *req)
if (unlikely(req->i.size == 0)) {
/* The only size==0 bios we expect are empty flushes. */
D_ASSERT(req->master_bio->bi_rw & REQ_FLUSH);
if (remote && mdev->tconn->current_tle_writes)
if (remote)
start_new_tl_epoch(mdev->tconn);
return 0;
}
@ -1066,13 +1069,15 @@ void __drbd_make_request(struct drbd_conf *mdev, struct bio *bio, unsigned long
/* which transfer log epoch does this belong to? */
req->epoch = atomic_read(&mdev->tconn->current_tle_nr);
if (rw == WRITE)
mdev->tconn->current_tle_writes++;
/* no point in adding empty flushes to the transfer log,
* they are mapped to drbd barriers already. */
if (likely(req->i.size!=0))
if (likely(req->i.size!=0)) {
if (rw == WRITE)
mdev->tconn->current_tle_writes++;
list_add_tail(&req->tl_requests, &mdev->tconn->transfer_log);
}
if (rw == WRITE) {
if (!drbd_process_write_request(req))