Ondrej Kozina 88b3924132 Update LUKS2 locks for atomic operations. ...

Atomic operation requires to hold a lock for longer period than
single metadata I/O. Update locks so that we can:

- lock a device more than once (lock ref counting)
- reaquire read lock on already held write lock (write lock
  is stronger than read lock)

2019-03-05 17:07:31 +01:00

20 KiB

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