Re: [PATCH] autofs4 - use lookup access intent to supportrecursive bind mounts

From: Al Viro
Date: Mon Apr 28 2008 - 02:22:43 EST


On Mon, Apr 28, 2008 at 02:14:54PM +0800, Ian Kent wrote:
>
> Hi Andrew,
>
> For autofs maps that recursively reference other map entries in their
> mount point path we need to ensure that these mounts are performed
> prior to the current mount request being done. We've used the access
> system call, made just prior to performing the mount, to make this
> happen. In the case of bind mounts, however, the lookup flags in
> the path walk don't trigger a mount. To do this we need to also
> trigger a mount when we see the LOOKUP_ACCESS flag.

That's too fscking bad, since ->lookup() is about to lose access to
nameidata *and* flags for anything but the last step. IOW, we'll need
cleaner solution...
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