Re: [Qemu-devel] [v9 Patch 6/6]Qemu: raw posix implementation of reopen functions

[Christoph Hellwig]

On Tue, Nov 22, 2011 at 11:32:42AM +0000, Stefan Hajnoczi wrote:
> Are you sure POSIX guarantees that O_DIRECT can be changed with
> F_SETFL?  I didn't find any statement in the specification.  It is
> possible that this code compiles but does not actually work on
> non-Linux OSes.  Did you run tests?

O_DIRECT is a non-posix extention, and semantics of it will differ
greatly between the operating systems implementing it.