Greg KH wrote:
In looking at open(2), it says that O_DIRECT works on 512 byte boundries with the 2.6 kernel release: Under Linux 2.4, transfer sizes, and the alignment of the user buffer and the file offset must all be multiples of the logical block size of the file system. Under Linux 2.6, alignment to 512-byte boundaries suffices. However if you try to access an O_DIRECT opened file with a buffer that is PAGE_SIZE aligned + 512 bytes, it fails in a bad way (wrong data is read.) Is this just a mistake in the documentation? Or am I reading it incorrectly? I have a test program that shows this if anyone wants it.
Well, it sounds like a bug to me.. even if it's not supported, if you do such an access, surely the kernel should detect that and return EINVAL or something rather than reading corrupted data..
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