Map TPM2_RC_NV_SPACE to -ENOBUFS in tpm2_define_nvpcr_nv_index() rather than -ENOSPC, giving it a dedicated errno distinct from the -ENOSPC that write_string_file_at() can return when /run is full — a different failure that occurs after the NV index is already allocated on the TPM. In extend_nvpcr_now(), propagate -ENOBUFS as-is so callers can handle it in a nicer fashion. In vl_method_extend(), map it to the new varlink error io.systemd.PCRExtend.NvPCRSpaceExhausted. In run(), handle -ENOBUFS explicitly under --graceful and print an appropriate message. Update tpm2-setup.c accordingly. Fixes #42725 Signed-off-by: dongshengyuan <dongshengyuan@uniontech.com>
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