[PATCH 4/4] Remove broken posix_fallocate, posix_falllocate64 fallback code [BZ#15661]

[Christoph Hellwig]

On Tue, May 05, 2015 at 04:28:41PM -0400, Carlos O'Donell wrote:
> The other side of the coin is that POSIX goes on further to say in
> "2.9.7 Thread Interactions with Regular File Operations" that threads
> should never see interleaving sets of file operations, but it is insane
> to do anything like that because it kills performance, so you don't get
> those guarantees in Linux.

Which specific guarantees do you see violated with a sane filesystem like
XFS?