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author | Michael Adam <obnox@samba.org> | 2008-08-05 18:42:07 +0200 |
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committer | Michael Adam <obnox@samba.org> | 2008-08-13 11:54:06 +0200 |
commit | ed6692964768fd14d1b6c3378e40e23c68e9dd63 (patch) | |
tree | 21067bd759f670fd939315471811bdb6ed2cf77b /examples/tridge/smb.conf | |
parent | fd070dc9af61677789cbe0d4464428ac68858b3a (diff) | |
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dbwrap ctdb: release the lock before calling ctdbd_persistent_store()
in the persistent db_ctdb_store operation.
This is to prevent deadlocks in db_ctdb_persistent_store().
There is a tradeoff: Usually, the record is still locked
after db->store operation. This lock is usually released
via the talloc destructor with the TALLOC_FREE to
the record. So we have two choices:
- Either re-lock the record after the call to persistent_store
or cancel_persistent update and this way not changing any
assumptions callers may have about the state, but possibly
introducing new race conditions.
- Or don't lock the record again but just remove the
talloc_destructor. This is less racy but assumes that
the lock is always released via TALLOC_FREE of the record.
I choose the first variant for now since it seems less racy.
We can't guarantee that we succeed in getting the lock
anyways. The only real danger here is that a caller
performs multiple store operations after a fetch_locked()
which is currently not the case.
Michael
(This used to be commit d004c9a7281d2577c3ba2012c8f790cc198ea700)
Diffstat (limited to 'examples/tridge/smb.conf')
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