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    SubjectRe: file metadata via fs API
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    On Wed, 2020-08-12 at 14:06 +0100, David Howells wrote:
    > Miklos Szeredi <miklos@szeredi.hu> wrote:
    >
    > > That presumably means the mount ID <-> mount path mapping already
    > > exists, which means it's just possible to use the open(mount_path,
    > > O_PATH) to obtain the base fd.
    >
    > No, you can't. A path more correspond to multiple mounts stacked on
    > top of
    > each other, e.g.:
    >
    > mount -t tmpfs none /mnt
    > mount -t tmpfs none /mnt
    > mount -t tmpfs none /mnt
    >
    > Now you have three co-located mounts and you can't use the path to
    > differentiate them. I think this might be an issue in autofs, but
    > Ian would
    > need to comment on that.

    It is a problem for autofs, direct mounts in particular, but also
    for mount ordering at times when umounting a tree of mounts where
    mounts are covered or at shutdown.

    Ian

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