On Fri, Feb 10, 2006 at 02:53:48PM +0000, Alasdair G Kergon wrote: > I disagree - either dm should work out the *correct* geometry to > return for those mappings where a geometry is known and it's sensible > to return one (e.g. linear mapping to the start of certain scsi > devices), or else it should leave it to userspace to decide how to > handle the situation. (And there's nothing currently stopping > userspace seeing that a dm device is constructed out of a scsi device > and choosing to use the geometry of that underlying device.) s/scsi/hd/ in those examples for slightly more sense What would the 'geometry' of a dm 'error' target mean? Or of a snapshot? In any patch, consider that we've already identified a need (e.g. for multipath) to add a framework to device-mapper to pass certain ioctls along to the underlying devices. I'd prefer to see that approach here: for tables with a single entry, pass the ioctl into the target. Linear and multipath would then pass it along to the underlying device; other targets would return zeros. Alasdair -- agk@xxxxxxxxxx -- dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
