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    SubjectRe: Grace period
    On Mon, Apr 09, 2012 at 04:17:06PM +0000, Myklebust, Trond wrote:
    > On Mon, 2012-04-09 at 12:11 -0400, bfields@fieldses.org wrote:
    > > On Mon, Apr 09, 2012 at 08:08:57PM +0400, Stanislav Kinsbursky wrote:
    > > > 09.04.2012 19:27, Jeff Layton пишет:
    > > > >
    > > > >If you allow one container to hand out conflicting locks while another
    > > > >container is allowing reclaims, then you can end up with some very
    > > > >difficult to debug silent data corruption. That's the worst possible
    > > > >outcome, IMO. We really need to actively keep people from shooting
    > > > >themselves in the foot here.
    > > > >
    > > > >One possibility might be to only allow filesystems to be exported from
    > > > >a single container at a time (and allow that to be overridable somehow
    > > > >once we have a working active/active serving solution). With that, you
    > > > >may be able limp along with a per-container grace period handling
    > > > >scheme like you're proposing.
    > > > >
    > > >
    > > > Ok then. Keeping people from shooting themselves here sounds reasonable.
    > > > And I like the idea of exporting a filesystem only from once per
    > > > network namespace.
    > >
    > > Unfortunately that's not going to get us very far, especially not in the
    > > v4 case where we've got the common read-only pseudoroot that everyone
    > > has to share.
    >
    > I don't see how that can work in cases where each container has its own
    > private mount namespace. You're going to have to tie that pseudoroot to
    > the mount namespace somehow.

    Sure, but in typical cases it'll still be shared; requiring that they
    not be sounds like a severe limitation.

    --b.
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