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drbd: abort start of resync early, if it raced with connection breakage 

We've seen a spurious full resync, because a connection breakage
raced with drbd_start_resync(, C_SYNC_TARGET),
and the resulting state change request intended to start the resync
ended up looking like a local invalidate.

Fix:
Double check the state inside the lock,
and don't even request that state change,
if we had connection or IO problems.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Philipp Reisner 2013-03-27 14:08:35 +01:00 committed by Jens Axboe
parent 2d56a974f3
commit a700471bf3
1 changed files with 3 additions and 1 deletions
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4
drivers/block/drbd/drbd_worker.c
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@ -1653,7 +1653,9 @@ void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side)
clear_bit(B_RS_H_DONE, &mdev->flags);
write_lock_irq(&global_state_lock);
if (!get_ldev_if_state(mdev, D_NEGOTIATING)) {
/* Did some connection breakage or IO error race with us? */
if (mdev->state.conn < C_CONNECTED
|| !get_ldev_if_state(mdev, D_NEGOTIATING)) {
write_unlock_irq(&global_state_lock);
mutex_unlock(mdev->state_mutex);
return;