[Engine-devel] Disk Permissions Feature

[Omer Frenkel]

----- Original Message -----
> From: "Oved Ourfalli" <ovedo at redhat.com>
> To: "Itamar Heim" <iheim at redhat.com>
> Cc: engine-devel at ovirt.org, "Omer Frenkel" <ofrenkel at redhat.com>
> Sent: Sunday, March 18, 2012 11:09:54 AM
> Subject: Re: [Engine-devel] Disk Permissions Feature
> 
> 
> 
> ----- Original Message -----
> > From: "Itamar Heim" <iheim at redhat.com>
> > To: "Omer Frenkel" <ofrenkel at redhat.com>
> > Cc: engine-devel at ovirt.org
> > Sent: Thursday, March 15, 2012 5:46:07 PM
> > Subject: Re: [Engine-devel] Disk Permissions Feature
> > 
> > On 03/15/2012 05:34 PM, Omer Frenkel wrote:
> > >>> >  >  1. "Create disk - requires permissions on the Storage
> > >>> >  >  Domain,
> > >>> >  >  (can't
> > >>> >  >  assume Quota is sufficient to permit user creating the
> > >>> >  >  disk
> > >>> >  >  on the
> > >>> >  >  Storage Domain, as Quota might be disabled)"
> > >>> >  >
> > >>> >  >  I'd also specify create disk for regular disks is at
> > >>> >  >  storage domain
> > >>> >  >  level?, while direct lun disks require system level
> > >>> >  >  permission of
> > >>> >  >  add disk.
> > >>> >  >
> > >>> >  >  so, if quota is disabled, how important is it to prevent
> > >>> >  >  creation
> > >>> >  >  of
> > >>> >  >  disks (other than direct lun ones, which would require a
> > >>> >  >  permission
> > >>> >  >  similar to storage domain creation)?
> > >>> >  >
> > >>> >  >  if this is added, it has to be implicitly added / not
> > >>> >  >  needed if
> > >>> >  >  user has
> > >>> >  >  quota (i.e., having a quota should be similar to having a
> > >>> >  >  permission as
> > >>> >  >  far as the check goes).
> > >>> >  >
> > >> >
> > >> >  We should look into it, how complicate is it to validate if
> > >> >  user has
> > >> >  either quota or permission, and allow creating a disk on a SD
> > >> >  if
> > >> >  either
> > >> >  exists.
> > > this might be confusing to the user as he can disable the quota,
> > > then stuff would stop working.
> > >
> > 
> > we can't require both quota and permissions from user on storage
> > domains
> > - that's cumbersome.
> > question is if we can limit the need for permissions to disks only
> > to
> > places where they are needed (shared, direct, floating)?
> +1 on that.
> I also think it is only relevant on attaching a disk to a VM, as the
> other use-cases are simpler:
> 1. Attach disk to VM - would require having permissions on the disk
> (whether it is shared, direct lun or floating)
> 2. Add disk to VM - would only require quota (if enforced).
> 3. Create disk (i.e., floating/shared disk) - would only require
> quota (if enforced).

and if not enforced? anyone can create as much disks as he like?
we thought of requiring permissions if quota is disabled,
but i think its confusing to the user as he plays with 
> 
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>