Andreas Kling 59ed235c85 Kernel: Implement O_DIRECT open() flag to bypass disk caches ...

Files opened with O_DIRECT will now bypass the disk cache in read/write
operations (though metadata operations will still hit the disk cache.)

This will allow us to test actual disk performance instead of testing
disk *cache* performance, if that's what we want. :^)

There's room for improvment here, we're very aggressively flushing any
dirty cache entries for the specific block before reading/writing that
block. This is done by walking the entire cache, which may be slow.

2019-11-05 19:35:12 +01:00

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