bug#9500: [PATCH]: use posix_fallocate where supported

[Goswin von Brederlow]

Pádraig Brady <address@hidden> writes:

> Hmm, one of your points above got me thinking.
> Might fallocate() fail to allocate an extent with ENOSPC,
> but there could be fragmented space available to write()?
> That would scupper benefit (2) above :(
> I'll ask address@hidden
>
> cheers,
> Pádraig.

fallocate() in no way garanties that the space is continious. Any
filesystem that is halfway smart will use a continious chunk if
possible. But it should only fail if there is really no space, no matter
how fragmented, left.

MfG
        Goswin