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[Xen-devel] [PATCH] tapdisk:check O_DIRECT on hole file for performance
Although tapdisk has been instead of tapdisk-ioemu, but it still used on some old xen-3.2.
So fix a performance problem here.
Kernel aio will retry when encounter a block doesn't allocated, then do async io,
but O_DIRECT flag was there, so io_wait on sync data.
And clean a little code style.
Signed-off-by: Wei Kong <firstname.lastname@example.org>
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