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

[Rich Felker]

On Wed, May 06, 2015 at 03:48:38PM -0700, Paul Eggert wrote:
> Florian Weimer wrote:
> >Maybe we could remove the write loop and perform only an ftruncate call
> >which (hopefully) increases the file size.  This would take care of the
> >O_APPEND issue and remove most of the races.
> 
> I like this idea.

If I'm not mistaken ftruncate could still reduce the file size if it
races with another operation that would extend the file. This is also
a data loss bug.

Rich