Direct/Raw/Unbuffered I/O

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Hi, I am trying to fnd out if (redhat 7.3) 2.4.18 kernel suports direct i/o
anyhow. I looked at the system call manpage and open() function does not
take O_DIRECT for direct/unbuffered/raw I/O as SGI does. Is Direct I/O
possible with a formatted filesystem? Thanks.





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