[PATCH 1/6] Add a dentry op to handle automounting rather than abusing follow_link() [ver #2]
David Howells
dhowells at redhat.com
Tue Jul 27 04:48:41 EDT 2010
Ian Kent <raven at themaw.net> wrote:
> Is this something others need?
Not as far as I know... I think autofs is the only one doing out-of-kernel
automounting.
That doesn't mean it shouldn't be provided, though...
> Again, the exists vs not yet exists case for paths within indirect
> autofs mounts. At the moment I can just set the flag on all dentrys in
> the autofs fs and return EXDEV for non-empty directories in order to
> return the dentry as a path component. OTOH if the dentry is a mount
> embeded in the path and the mount fails we get a error return.
Seems redundant, but I'd say go with it for now. Maybe we can offload
S_AUTOMOUNT to the dentry.
> I could clear the flag on non-root parent dentrys during mkdir if this
> is needed by others.
I'm not sure that would actually matter, since it would come to
follow_automount() at the same place.
Note that someone who tries to stat() with AT_NO_AUTOMOUNT will cause the call
to d_automount() to be suppressed and will see the negative or non-mounted
directory. That might be okay for you.
David
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