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SubjectRe: Quotactl change
hi Al,

On Sat, Oct 06, 2001 at 02:25:06PM -0400, Alexander Viro wrote:
> On Sat, Oct 06, 2001 at 03:07:32PM +0200, Jan Kara wrote:
> > I'm sending you a change for quotactl interface which Nathan
> > Scott proposed for XFS. Actually it's his patch with just a few
> > changes from me.
> > It allows quotactl() to be overidden by a filesystem and so XFS
> > can do it's tricks with quota without patching dquot.c. Sideeffect
> > of this change is a cleanup in quotactl() interface :).
> [snip]
> Umm... So you've just given to each fs driver a syscall with
> completely unspecified arguments? I _really_ doubt that it's a good
> idea, especially since each instance will have to copy structures
> to/from userland.
> Please, put switch by the first argument and copy_{to,from}_user()
> into the syscall itself. Yes, it means more methods, but it helps to avoid
> large PITA couple of years down the road.

OK, if that's for the best, I'll rework it. I thought it would
be cleaner to do it that other way, because it meant not having
any knowledge of the filesystem-specific quota data structures
and operations up at this higher (vfs) level. Since ioctl is
available as a generic copy in/out facility already, I'm not
sure why any filesystem would abuse quotactl in this way, but
perhaps that's just human nature. ;-)

The only other reason that I was thinking of - I expect that
Veritas' VxFS will also wish to provide its own quota subsystem,
as they seem to do for other operating systems. Since (and I may
be wrong here) the intention there is to make VxFS a commercial
filesystem for Linux, it would also help those folk out if the
point of doing the user data copying was within the filesystem.
So, I was trying to do the right thing by everyone in making it
generic - your suggestion will work just fine for our needs in
XFS though.

Thanks for the feedback - new patch later.


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