ptfs: refine the way to support O_DIRECT #176
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We have special support of the O_DIRECT flag, but the implementation has race conditions due to `Time To Check & Time To Use` issues. So refine the implementation by using a RwLock. Signed-off-by: Jiang Liu <gerry@linux.alibaba.com>
If error happens between File::from_raw_fd() and ManuallyDrop::new(), the underlying fd will be closed unexpectedly. Fix it by introducing a helper to ensure atomicity. Signed-off-by: Jiang Liu <gerry@linux.alibaba.com>
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We have special support of the O_DIRECT flag, but the implementation has race conditions due to
Time To Check & Time To Useissues. So refine the implementation by using a RwLock.