[PATCH 00/27] fs: port to const struct mnt_idmap

[Seth Forshee]

On Tue, Sep 01, 2026 at 02:14:25PM +0200, Christian Brauner wrote:
> A mount's idmapping is immutable. The only thing that is allowed to be
> modified afterwards is the reference count and that is hidden behind
> mnt_idmap_get() and mnt_idmap_put(). Everything else only ever reads
> from the idmapping. This is the same model that struct cred uses and the
> idmapping is also rather sensitive.
> 
> So make the idmap argument const wherever we can. The conversion is done
> from the bottom up so callers can continue to pass a non-const pointer
> to a const parameter until the conversion is finished.
> 
> Signed-off-by: Christian Brauner (Amutable) <brauner at kernel.org>

Looks good!

Reviewed-by: Seth Forshee <sforshee at kernel.org>