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* libblock: Fix read-ahead trigger and next updateSebastian Huber2012-07-021-5/+7
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* libblock: Add read-ahead taskSebastian Huber2012-06-041-0/+11
Read-ahead requests were previously executed in the context of the reading task. This blocks the reading task until the complete read with read-ahead transfer is finished. A read-ahead task is introduced to off-load the read-ahead transfer. This allows the reading task to work with the requested block more quickly. The read-ahead is triggered after two misses of ascending consecutive blocks or a read hit of a block read by the most-recent read-ahead transfer. The read-ahead feature is configurable and can be disabled.