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drbd: Fixed a race condition between detach and start of resync 

drbd_state_lock() is only there to serialize cluster wide state
changes. Testing the local disk state needs to happen while
holding the global_state_lock.

Otherwise you might see something like this (Oct 6 on kugel)
14:20:24 drbd0: conn( WFSyncUUID -> Connected ) disk( Inconsistent -> Failed )
14:20:24 drbd0: helper command: /sbin/drbdadm before-resync-target minor-0 exit code 0 (0x0)
14:20:24 drbd0: conn( Connected -> SyncTarget ) disk( Failed -> Inconsistent )

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 2011-10-06 18:29:14 +02:00
parent 6a9a92f4ef
commit aaae506d54
1 changed files with 3 additions and 3 deletions
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6
drivers/block/drbd/drbd_worker.c
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@ -1537,14 +1537,14 @@ void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side)
}
drbd_state_lock(mdev);
write_lock_irq(&global_state_lock);
if (!get_ldev_if_state(mdev, D_NEGOTIATING)) {
write_unlock_irq(&global_state_lock);
drbd_state_unlock(mdev);
return;
}
write_lock_irq(&global_state_lock);
ns = mdev->state;
ns.i = mdev->state.i;
ns.aftr_isp = !_drbd_may_sync_now(mdev);