[dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

[Alasdair G Kergon]

On Wed, May 30, 2007 at 11:12:37AM +0200, Stefan Bader wrote:
> it might be better to indicate -EOPNOTSUPP right from
> device-mapper.
 
Indeed we should.  For support, on receipt of a barrier, dm core should
send a zero-length barrier to all active underlying paths, and delay
mapping any further I/O.

Alasdair
-- 
agk at redhat.com