> > Say you have NFS mount on /mnt and a bind mount over the regular file
> > /mnt/foo. You do open("/mnt/foo", O_RDWR | O_CREAT, 0644). How do
> > you solve the atomic open case.
>
> > If you open in ->lookup("foo") you will be opening the wrong file,
> > unless you want to follow mounts inside ->lookup.
>
> Firstly, if that is the case, then you will have dentries for both the
> covered and the covering copies of /mnt/foo. A simple test of
> have_submounts() on the dentry will suffice to tell the filesystem.
> whether or not it should open the file.
And if the bind is umounted after NFS determined not to open the file,
and at the same time it changes to a symlink on the server (not very
likely I agree, but possible nonetheless), then shit happens.
> Secondly, Linux doesn't actually allow bind mounts on top of regular
> files.
It does. Try it.
Miklos
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