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| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2012-06-19 10:27:58 +0200 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2012-07-24 14:15:58 +0200 |
| commit | 7ee1fb93f390f7a7231abec4e34e6ab20abeed45 (patch) | |
| tree | 34a4e86335dc8f6dca13abcae3bf60ca5f8b37ab | |
| parent | c12e9c8964215aaf2b5dcd06048444c2b672f0b9 (diff) | |
| download | op-kernel-dev-7ee1fb93f390f7a7231abec4e34e6ab20abeed45.zip op-kernel-dev-7ee1fb93f390f7a7231abec4e34e6ab20abeed45.tar.gz | |
drbd: flush drbd work queue before invalidate/invalidate remote
If you do back to back wait-sync/invalidate on a Primary in a tight loop,
during application IO load, you could trigger a race:
kernel: block drbd6: FIXME going to queue 'set_n_write from StartingSync'
but 'write from resync_finished' still pending?
Fix this by changing the order of the drbd_queue_work() and
the wake_up() in dec_ap_pending(), and adding the additional
drbd_flush_workqueue() before requesting the full sync.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| -rw-r--r-- | drivers/block/drbd/drbd_int.h | 10 | ||||
| -rw-r--r-- | drivers/block/drbd/drbd_nl.c | 8 |
2 files changed, 12 insertions, 6 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index 5136510..2704af2 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -2421,15 +2421,17 @@ static inline void dec_ap_bio(struct drbd_conf *mdev) int ap_bio = atomic_dec_return(&mdev->ap_bio_cnt); D_ASSERT(ap_bio >= 0); + + if (ap_bio == 0 && test_bit(BITMAP_IO, &mdev->flags)) { + if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags)) + drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w); + } + /* this currently does wake_up for every dec_ap_bio! * maybe rather introduce some type of hysteresis? * e.g. (ap_bio == mxb/2 || ap_bio == 0) ? */ if (ap_bio < mxb) wake_up(&mdev->misc_wait); - if (ap_bio == 0 && test_bit(BITMAP_IO, &mdev->flags)) { - if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags)) - drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w); - } } static inline int drbd_set_ed_uuid(struct drbd_conf *mdev, u64 val) diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index a68d9bf..c47df7c 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -1977,9 +1977,11 @@ static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nl int retcode; /* If there is still bitmap IO pending, probably because of a previous - * resync just being finished, wait for it before requesting a new resync. */ + * resync just being finished, wait for it before requesting a new resync. + * Also wait for it's after_state_ch(). */ drbd_suspend_io(mdev); wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); + drbd_flush_workqueue(mdev); retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED); @@ -2018,9 +2020,11 @@ static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_re int retcode; /* If there is still bitmap IO pending, probably because of a previous - * resync just being finished, wait for it before requesting a new resync. */ + * resync just being finished, wait for it before requesting a new resync. + * Also wait for it's after_state_ch(). */ drbd_suspend_io(mdev); wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); + drbd_flush_workqueue(mdev); retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED); |
