Usage of truncate() with aufs

Hi,

Looking to bug #1371 (http://www.squid-cache.org/bugs/show_bug.cgi?id=1371)
I have found the following code:

void
DiskThreadsIOStrategy::unlinkFile(char const *path)
{
     statCounter.syscalls.disk.unlinks++;
#if USE_TRUNCATE_NOT_UNLINK

     aioTruncate(path, NULL, NULL);
#else

     aioUnlink(path, NULL, NULL);
#endif
}

And in configure I'm reading:

  --enable-truncate This uses truncate() instead of unlink() when
                           removing cache files. Truncate gives a little
                           performance improvement, but may cause problems
                           when used with async I/O. Truncate uses more
                           filesystem inodes than unlink..

So I have a doubt:

#if USE_TRUNCATE_NOT_UNLINK

Is an error or a trick to avoid usage of truncate() with aufs ?

Regards

Guido

-
========================================================
Guido Serassio
Acme Consulting S.r.l. - Microsoft Certified Partner
Via Lucia Savarino, 1 10098 - Rivoli (TO) - ITALY
Tel. : +39.011.9530135 Fax. : +39.011.9781115
Email: guido.serassio@acmeconsulting.it
WWW: http://www.acmeconsulting.it/
Received on Mon Aug 08 2005 - 11:09:13 MDT