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Add a brief introduction for file system kfuncs: bpf_get_file_xattr() bpf_get_fsverity_digest() The documentation highlights the strategy to avoid recursions of these kfuncs. Signed-off-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20231129234417.856536-4-song@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>