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    SubjectRe: [PATCH 06/17] Add an AT_NO_AUTOMOUNT flag to suppress terminal automount
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    On Thu, 2010-09-30 at 19:15 +0100, David Howells wrote:
    > Add an AT_NO_AUTOMOUNT flag to suppress terminal automounting of directories
    > with follow_link semantics. This can be used by fstatat() users to permit the
    > gathering of attributes on an automount point and also prevent
    > mass-automounting of a directory of automount points by ls.
    >
    > Signed-off-by: David Howells <dhowells@redhat.com>
    > Acked-by: Ian Kent <raven@themaw.net>
    > ---
    >
    > fs/namei.c | 6 ++++++
    > fs/stat.c | 4 +++-
    > include/linux/fcntl.h | 1 +
    > include/linux/namei.h | 2 ++
    > 4 files changed, 12 insertions(+), 1 deletions(-)
    >
    > diff --git a/fs/namei.c b/fs/namei.c
    > index 86421f9..74bce3a 100644
    > --- a/fs/namei.c
    > +++ b/fs/namei.c
    > @@ -625,6 +625,12 @@ static int follow_automount(struct path *path, unsigned flags,
    > if (!path->dentry->d_op || !path->dentry->d_op->d_automount)
    > return -EREMOTE;
    >
    > + /* We don't want to mount if someone supplied AT_NO_AUTOMOUNT
    > + * and this is the terminal part of the path.
    > + */
    > + if ((flags & LOOKUP_NO_AUTOMOUNT) && !(flags & LOOKUP_CONTINUE))
    > + return -EXDEV; /* we actually want to stop here */

    Oops, we missed this -EXDEV when we made the change to -EISDIR.

    Ian



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