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Userspace when requesting a session via the ioctl specifies a name and gets a FD, but then there is no ioctl to go back the other way and get the name given a LUO session FD. This is problematic especially when there is a userspace orchestrator that wants to check what FDs it is handling for clients without having to do manual string scraping of procfs, or without procfs at all. Add a ioctl to simply get the name from an FD. Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com> Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com> Reviewed-by: Pratyush Yadav <pratyush@kernel.org> Link: https://lore.kernel.org/r/20260429212221.814107-4-luca.boccassi@gmail.com Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>