On Fri, 13 Sep 2024, Pali Rohár wrote: > NLMv2 is completely different protocol than NLMv1 and NLMv3, and in > original Sun implementation is used for RPC loopback callbacks from statd > to lockd services. Linux does not use nor does not implement NLMv2. > > Hence, NLMv3 is not backward compatible with NLMv2. But NLMv3 is backward > compatible with NLMv1. Fix comment. > > Signed-off-by: Pali Rohár <pali@xxxxxxxxxx> > --- > fs/lockd/clntxdr.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/fs/lockd/clntxdr.c b/fs/lockd/clntxdr.c > index a3e97278b997..81ffa521f945 100644 > --- a/fs/lockd/clntxdr.c > +++ b/fs/lockd/clntxdr.c > @@ -3,7 +3,9 @@ > * linux/fs/lockd/clntxdr.c > * > * XDR functions to encode/decode NLM version 3 RPC arguments and results. > - * NLM version 3 is backwards compatible with NLM versions 1 and 2. > + * NLM version 3 is backwards compatible with NLM version 1. > + * NLM version 2 is different protocol used only for RPC loopback callbacks > + * from statd to lockd and is not implemented on Linux. > * > * NLM client-side only. > * Reviewed-by: NeilBrown <neilb@xxxxxxx> Do you have a reference for that info about v2? I hadn't heard of it before. NeilBrown
