On Thu, Jan 27 2005, Jeff Garzik wrote: > Doug Maxey wrote: > >On Thu, 27 Jan 2005 13:02:48 +0100, Jens Axboe wrote: > > > >>Hi, > >> > >>For the longest time, only the old PATA drivers supported barrier writes > >>with journalled file systems. This patch adds support for the same type > >>of cache flushing barriers that PATA uses for SCSI, to be utilized with > >>libata. > > > > > >What, if any mechanism supports changing the underlying write cache? > > > >That is, assuming this is common across PATA and SCSI drives, and it is > >possible to turn the cache off on the IDE drives, would switching the > >cache underneath require completing the inflight IO? > > [ignoring your question, but it made me think...] > > > I am thinking the barrier support should know if the write cache is > disabled (some datacenters do this), and avoid flushing if so?
Ehm it does, read the code :) -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/