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    SubjectRe: bug in 2.6.22-rc2: loop mount limited to one single iso image
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    On Sun, 2007-05-20 at 09:10 -0700, Ray Lee wrote:
    > On 5/20/07, Kay Sievers <kay.sievers@vrfy.org> wrote:
    > > On 5/20/07, Ray Lee <ray-lk@madrabbit.org> wrote:
    > > > On 5/19/07, Al Viro <viro@ftp.linux.org.uk> wrote:
    > > > > On Sat, May 19, 2007 at 11:16:59PM -0700, Ray Lee wrote:
    > > > > > Ken? Ball's in your court. As the patch isn't providing a killer
    > > > > > feature for 2.6.22, I'd suggest just reverting it for now until the
    > > > > > issues are ironed out.
    > > > >
    > > > > Hold it. The real question here is which logics do we want there.
    > > > > IOW, and how many device nodes do we want to appear and _when_ do
    > > > > we want them to appear?
    > > >
    > > > The when part is what looks to make it racy. I'm guessing that we're
    > > > relying on udev to create those loop nodes. If so, I think any scheme
    > > > that creates more on demand would give transient mount errors while
    > > > it's waiting on udev to create more nodes.
    > > >
    > > > Perhaps if we were to start with 8 loop nodes at init (as we have in
    > > > 2.6.21), and then always maintain a margin of 8 (or 4, or...) when
    > > > they start being used or detached?
    > >
    > > Until the tools can request dynamic loop device allocation from the
    > > kernel before they want to use the device, you can create as many as
    > > needed "static" loop* nodes in /lib/udev/devices/, which will be
    > > copied to /dev/ early on every bootup.
    >
    > Except that's different than current behavior presented to userspace.
    > IOW, we broke userspace for anyone using udev. Which is, y'know, a lot
    > of us.
    >
    > We're at -rc2 right now. Given that, it looks like we have two
    > options. First is to revert all this for now and try again when the
    > patch has had more testing and agreement (as this isn't a major
    > feature we're talking about here; it's effectively just a cleanup that
    > happened to have unfortunate side-effects).
    >
    > The second option is that we could have the loop device start with 8
    > nodes populated, which would match current behavior.
    >
    > A third option of requiring new userspace for 2.6.22 is a non-starter.

    Right, providing "preallocated" devices, 8 or the number given in
    max_loop, sounds like the best option until the tools can handle that.

    Thanks,
    Kay

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