Re: [PATCH 18/39] bpf maps: switch to CLASS(fd, ...)

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On Tue, Jul 30, 2024 at 01:16:04AM GMT, viro@xxxxxxxxxx wrote:
> From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> 
>         Calling conventions for __bpf_map_get() would be more convenient
> if it left fpdut() on failure to callers.  Makes for simpler logics
> in the callers.
> 
> 	Among other things, the proof of memory safety no longer has to
> rely upon file->private_data never being ERR_PTR(...) for bpffs files.
> Original calling conventions made it impossible for the caller to tell
> whether __bpf_map_get() has returned ERR_PTR(-EINVAL) because it has found
> the file not be a bpf map one (in which case it would've done fdput())
> or because it found that ERR_PTR(-EINVAL) in file->private_data of a
> bpf map file (in which case fdput() would _not_ have been done).
> 
> Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> ---

Reviewed-by: Christian Brauner <brauner@xxxxxxxxxx>




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