Re: [PATCH] Allow O_SYNC to be set by fcntl(F_SETFL)

[Christoph Hellwig]

On Fri, Apr 08, 2011 at 10:56:02AM -0700, Andrew Morton wrote:
> Because it's inconsistent.  An O_SYNC fd never has outstanding writeout. 
> Except for in this one new and special time window between a setfl()
> and the next write().

It might actually have outstanding writes for as long as it eventually
takes the writeback code to push them out.  O_SYNC only does a range
writeout for the area that was written.

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