On Mon, Nov 02 2015 at 10:45am -0500, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > > On 02/11/2015 16:05, Mike Snitzer wrote: > > > In any case, if we don't start path activation we should return > > > ENOTCONN, not ENOTTY. > > > > Currently, if we don't start path activation we're returning EIO. > > ENOTCONN is used for when we do start path activation (and ENOTCONN is > > the means for DM core to retry) > > > > We _could_ change the ENOTCONN to be EAGAIN and EIO to ENOTCONN... > > This makes sense... though of course testing the impact of this on > userspace is going to be hard. :( Chances are that userspace is not > expecting EAGAIN either. > > Even if they did, how would someone know that they can now retry the > ioctl after getting EAGAIN? Should they just do it in a loop? Turns out multipath (userspace) has a udev rule for this now (prajnoha pointed this out): http://git.opensvc.com/gitweb.cgi?p=multipath-tools/.git;a=blob;f=multipath/11-dm-mpath.rules So now I'm wondering if we _need_ to do any retries in kernel (aside from while activation is active)? -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
