Le mercredi 16 janvier 2008 à 08:57 -0600, Anthony Liguori a écrit : > > Le mardi 15 janvier 2008 à 23:54 +0000, Daniel P. Berrange a écrit : [...] > >>> 2- I'd like to mount qcow2 or others disk image formats, so perhaps it's > >>> easier to modify loop device driver (but perhaps you know another magic > >>> tool ?) > >>> > >> There has been some work in this area wrt to Xen - the DM-Userspace project > >> had some working code providing a device mapper target calling out to a > >> userspace daemon to handle non-raw file formats like qcow. I don't > >> know what the state of it is now wrt to upstream kernel / device-mapper, > >> or even whether it is more than just 'proof of concept', but the project > >> page is here with some info: > >> > >> http://wiki.xensource.com/xenwiki/DmUserspace > > FWIW, I still think a userspace block device is the Right Way to support
I agree with you, it was my first idea too, but it introduces complexity to manage communications between the kernel part of the driver and the userspace daemon: I don't like complexity. > these sort of things. dm-userspace turned out to be difficult as device > mapper has some rather strict requirements about alignment that some > formats (like qcow) cannot satisfy. > > The loop driver is a terrible base to start from as it does not preserve > data integrity. [...] But everyone already uses loop as it is currently, so why not to add more supported formats for the disk image ? Why do you say it doesn't preserve data integrity ? Regards, Laurent -- ----------------- [EMAIL PROTECTED] ------------------ "La perfection est atteinte non quand il ne reste rien à ajouter mais quand il ne reste rien à enlever." Saint Exupéry
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