> The reason why we do it as a lookup intent is because this has to be
> atomic lookup+create+open in order to be at all useful to NFS.
>
> Just doing create+open atomically is worthless since it leaves you with
> a bunch of races where someone on the server can create, say, a symlink
> between the RPC call to lookup and the RPC call that creates the file.
That's easy to solve: filesystem returns -EAGAIN, namei_open() redoes
the lookup and continues with the resolving. There would have to be
some safeguard counter to avoid infinite loops.
Filesystem could even populate the dentry with the symlink in
->open_create() to optimize away the relookup.
Do you see a problem with that?
Miklos
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