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    SubjectRe: [PATCH 0/4] autofs4 - autofs needs a miscelaneous device for ioctls
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    On Wed, 2008-02-27 at 20:40 -0800, Andrew Morton wrote:
    > On Tue, 26 Feb 2008 12:21:58 +0900 (WST) Ian Kent <raven@themaw.net> wrote:
    >
    > >
    > > Hi Andrew,
    > >
    > > There is a problem with active restarts in autofs (that is to
    > > say restarting autofs when there are busy mounts).
    > >
    > > Currently autofs uses "umount -l" to clear active mounts at
    > > restart. While using lazy umount works for most cases, anything
    > > that needs to walk back up the mount tree to construct a path,
    > > such as getcwd(2) and the proc file system /proc/<pid>/cwd, no
    > > longer works because the point from which the path is constructed
    > > has been detached from the mount tree.
    > >
    > > The actual problem with autofs is that it can't reconnect to
    > > existing mounts. Immediately one things of just adding the
    > > ability to remount autofs file systems would solve it, but
    > > alas, that can't work. This is because autofs direct mounts
    > > and the implementation of "on demand mount and expire" of
    > > nested mount trees have the file system mounted on top of
    > > the mount trigger dentry.
    > >
    > > To resolve this a miscellaneous device node for routing ioctl
    > > commands to these mount points has been implemented for the
    > > autofs4 kernel module.
    > >
    > > For those wishing to test this out an updated user space daemon
    > > is needed. Checking out and building from the git repo or
    > > applying all the current patches to the 5.0.3 tar distribution
    > > will do the trick. This is all available at the usual location
    > > on kernel.org.
    > >
    >
    > Could we please be a bit more specific than "the usual location"?

    Yes, I should have been more specific.
    I'll fix that.

    >
    > Should autofs userspace have an entry in Documentation/Changes?

    Sound like a sensible thing to do.
    I'll include a patch for that when I re-post the patch set.

    Ian




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