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| author | Philipp Reisner <philipp.reisner@linbit.com> | 2012-02-20 21:53:28 +0100 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2012-11-08 16:58:31 +0100 |
| commit | 9a51ab1c1b3c1e21f076cdd571bbe6ca7d1b504c (patch) | |
| tree | 863ba573f9a803d5f64979dae566a89ea22bbe5f /drivers/block/drbd/drbd_actlog.c | |
| parent | 26ec92871be1e6bd48d0be9ab38ee1ebbeea49f1 (diff) | |
| download | op-kernel-dev-9a51ab1c1b3c1e21f076cdd571bbe6ca7d1b504c.zip op-kernel-dev-9a51ab1c1b3c1e21f076cdd571bbe6ca7d1b504c.tar.gz | |
drbd: New disk option al-updates
By disabling al-updates one might increase performace. The price for
that is that in case a crashed primary (that had al-updates disabled)
is reintegraded, it will receive a full-resync instead of a bitmap
based resync.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_actlog.c')
| -rw-r--r-- | drivers/block/drbd/drbd_actlog.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c index 9eae289..83d48d2 100644 --- a/drivers/block/drbd/drbd_actlog.c +++ b/drivers/block/drbd/drbd_actlog.c @@ -276,8 +276,16 @@ void drbd_al_begin_io(struct drbd_conf *mdev, struct drbd_interval *i) /* Double check: it may have been committed by someone else, * while we have been waiting for the lock. */ if (mdev->act_log->pending_changes) { - al_write_transaction(mdev); - mdev->al_writ_cnt++; + bool write_al_updates; + + rcu_read_lock(); + write_al_updates = rcu_dereference(mdev->ldev->disk_conf)->al_updates; + rcu_read_unlock(); + + if (write_al_updates) { + al_write_transaction(mdev); + mdev->al_writ_cnt++; + } spin_lock_irq(&mdev->al_lock); /* FIXME |
