From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 96ECF1B0120; Thu, 29 Aug 2024 16:50:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724950222; cv=none; b=bcI4lagZa1vbSTkMYYl1gIf7F21KYPyR6vkofWxQgMPNI8NCGW7gIZUpjjHM0r/sIXYgC5NmRxnny1FUpmpTk/oDhs6knAbNf4lqF/vqkoM2Ge/T8M8CuzeVYCt2KdIfE3ZboZIuqGlknDAjgfBC7KTJKpH2X7TRM9yrTRSLP3U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724950222; c=relaxed/simple; bh=vkAvV/tBznxAcR3F2O8jfYlkB35JxoLYLZod+HS+/nw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ROTOSYg7SWAyVvcALv8EnQEIrcs4wQgsr4c8Py+wTqIb0v/iuwnkgl/8XTMXjgaVs11WGKfPYgm2DGAoRoSxaNt/I6LUVyG0uJSxpIyOclkOp+EiutQEAL+OAgotMO4ZLKKSIywyx0kgSORDQFFki8mEnIG8g7DVWREaOc/aaJI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hPVJsRAS; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hPVJsRAS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7D02FC4CEC1; Thu, 29 Aug 2024 16:50:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724950222; bh=vkAvV/tBznxAcR3F2O8jfYlkB35JxoLYLZod+HS+/nw=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=hPVJsRASzYpsBkcjaYbaRZN5HVlCZxjkFAwwo7+BEn++C0Lym/0l9ozrmQHb0cSMj 2W7gTjae2BbtRWsIufaF7lX89h6/jbXwJ/ZieG+UWRSRZudMUZRJoFEULLFZibtLfY h0PmIjbeJyL7nK5cbWRdtj7GrwP42dzQMNV4IQaRP0qO+lVLidh9F3EBmJjI63/xic dxgOlFg3sNzR23QzF6a4W2LuuNCytJBhHSO/97jmlkIlpruCetqTv6vKERANk5VlPV R+s2ywIVn3OXGMQmIDN5sp74e6X1Zx36jfIFLoCXrWs3MGaPKzos8iS6Z7YULv79u0 xmXbYiPah8Crw== Message-ID: Subject: Re: [PATCH v14 17/25] nfsd: implement server support for NFS_LOCALIO_PROGRAM From: Jeff Layton To: Mike Snitzer , linux-nfs@vger.kernel.org Cc: Chuck Lever , Anna Schumaker , Trond Myklebust , NeilBrown , linux-fsdevel@vger.kernel.org Date: Thu, 29 Aug 2024 12:50:20 -0400 In-Reply-To: <20240829010424.83693-18-snitzer@kernel.org> References: <20240829010424.83693-1-snitzer@kernel.org> <20240829010424.83693-18-snitzer@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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RPC protocol consists of a single "UUID_IS_LOCAL" > RPC method that allows the Linux NFS client to verify the local Linux > NFS server can see the nonce (single-use UUID) the client generated and > made available in nfs_common. The server expects this protocol to use > the same transport as NFS and NFSACL for its RPCs. This protocol > isn't part of an IETF standard, nor does it need to be considering it > is Linux-to-Linux auxiliary RPC protocol that amounts to an > implementation detail. >=20 > The UUID_IS_LOCAL method encodes the client generated uuid_t in terms of > the fixed UUID_SIZE (16 bytes). The fixed size opaque encode and decode > XDR methods are used instead of the less efficient variable sized > methods. >=20 > The RPC program number for the NFS_LOCALIO_PROGRAM is 400122 (as assigned > by IANA, see https://www.iana.org/assignments/rpc-program-numbers/ ): > Linux Kernel Organization 400122 nfslocalio >=20 > Acked-by: Chuck Lever > Signed-off-by: Mike Snitzer > [neilb: factored out and simplified single localio protocol] > Co-developed-by: NeilBrown > Signed-off-by: NeilBrown > --- > fs/nfsd/localio.c | 75 +++++++++++++++++++++++++++++++++++++++++++++ > fs/nfsd/nfsd.h | 4 +++ > fs/nfsd/nfssvc.c | 23 +++++++++++++- > include/linux/nfs.h | 7 +++++ > 4 files changed, 108 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/nfsd/localio.c b/fs/nfsd/localio.c > index 4b65c66be129..a192bbe308df 100644 > --- a/fs/nfsd/localio.c > +++ b/fs/nfsd/localio.c > @@ -13,12 +13,15 @@ > #include > #include > #include > +#include > +#include > #include > =20 > #include "nfsd.h" > #include "vfs.h" > #include "netns.h" > #include "filecache.h" > +#include "cache.h" > =20 > /** > * nfsd_open_local_fh - lookup a local filehandle @nfs_fh and map to nfs= d_file > @@ -103,3 +106,75 @@ EXPORT_SYMBOL_GPL(nfsd_open_local_fh); > =20 > /* Compile time type checking, not used by anything */ > static nfs_to_nfsd_open_local_fh_t __maybe_unused nfsd_open_local_fh_typ= echeck =3D nfsd_open_local_fh; > + > +/* > + * UUID_IS_LOCAL XDR functions > + */ > + > +static __be32 localio_proc_null(struct svc_rqst *rqstp) > +{ > + return rpc_success; > +} > + > +struct localio_uuidarg { > + uuid_t uuid; > +}; > + > +static __be32 localio_proc_uuid_is_local(struct svc_rqst *rqstp) > +{ > + struct localio_uuidarg *argp =3D rqstp->rq_argp; > + > + (void) nfs_uuid_is_local(&argp->uuid, SVC_NET(rqstp), > + rqstp->rq_client); > + > + return rpc_success; > +} > + > +static bool localio_decode_uuidarg(struct svc_rqst *rqstp, > + struct xdr_stream *xdr) > +{ > + struct localio_uuidarg *argp =3D rqstp->rq_argp; > + u8 uuid[UUID_SIZE]; > + > + if (decode_opaque_fixed(xdr, uuid, UUID_SIZE)) > + return false; > + import_uuid(&argp->uuid, uuid); > + > + return true; > +} > + > +static const struct svc_procedure localio_procedures1[] =3D { > + [LOCALIOPROC_NULL] =3D { > + .pc_func =3D localio_proc_null, > + .pc_decode =3D nfssvc_decode_voidarg, > + .pc_encode =3D nfssvc_encode_voidres, > + .pc_argsize =3D sizeof(struct nfsd_voidargs), > + .pc_ressize =3D sizeof(struct nfsd_voidres), > + .pc_cachetype =3D RC_NOCACHE, > + .pc_xdrressize =3D 0, > + .pc_name =3D "NULL", > + }, > + [LOCALIOPROC_UUID_IS_LOCAL] =3D { > + .pc_func =3D localio_proc_uuid_is_local, > + .pc_decode =3D localio_decode_uuidarg, > + .pc_encode =3D nfssvc_encode_voidres, > + .pc_argsize =3D sizeof(struct localio_uuidarg), > + .pc_argzero =3D sizeof(struct localio_uuidarg), > + .pc_ressize =3D sizeof(struct nfsd_voidres), > + .pc_cachetype =3D RC_NOCACHE, > + .pc_name =3D "UUID_IS_LOCAL", > + }, > +}; > + > +#define LOCALIO_NR_PROCEDURES ARRAY_SIZE(localio_procedures1) > +static DEFINE_PER_CPU_ALIGNED(unsigned long, > + localio_count[LOCALIO_NR_PROCEDURES]); > +const struct svc_version localio_version1 =3D { > + .vs_vers =3D 1, > + .vs_nproc =3D LOCALIO_NR_PROCEDURES, > + .vs_proc =3D localio_procedures1, > + .vs_dispatch =3D nfsd_dispatch, > + .vs_count =3D localio_count, > + .vs_xdrsize =3D XDR_QUADLEN(UUID_SIZE), > + .vs_hidden =3D true, > +}; > diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h > index b0d3e82d6dcd..232a873dc53a 100644 > --- a/fs/nfsd/nfsd.h > +++ b/fs/nfsd/nfsd.h > @@ -146,6 +146,10 @@ extern const struct svc_version nfsd_acl_version3; > #endif > #endif > =20 > +#if IS_ENABLED(CONFIG_NFSD_LOCALIO) > +extern const struct svc_version localio_version1; > +#endif > + > struct nfsd_net; > =20 > enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL }; > diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c > index 13c69aa40d1c..eec4a9803c4a 100644 > --- a/fs/nfsd/nfssvc.c > +++ b/fs/nfsd/nfssvc.c > @@ -80,6 +80,15 @@ DEFINE_SPINLOCK(nfsd_drc_lock); > unsigned long nfsd_drc_max_mem; > unsigned long nfsd_drc_mem_used; > =20 > +#if IS_ENABLED(CONFIG_NFSD_LOCALIO) > +static const struct svc_version *localio_versions[] =3D { > + [1] =3D &localio_version1, > +}; > + > +#define NFSD_LOCALIO_NRVERS ARRAY_SIZE(localio_versions) > + > +#endif /* CONFIG_NFSD_LOCALIO */ > + > #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) > static const struct svc_version *nfsd_acl_version[] =3D { > # if defined(CONFIG_NFSD_V2_ACL) > @@ -128,6 +137,18 @@ struct svc_program nfsd_programs[] =3D { > .pg_rpcbind_set =3D nfsd_acl_rpcbind_set, > }, > #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ > +#if IS_ENABLED(CONFIG_NFSD_LOCALIO) > + { > + .pg_prog =3D NFS_LOCALIO_PROGRAM, > + .pg_nvers =3D NFSD_LOCALIO_NRVERS, > + .pg_vers =3D localio_versions, > + .pg_name =3D "nfslocalio", > + .pg_class =3D "nfsd", > + .pg_authenticate =3D svc_set_client, > + .pg_init_request =3D svc_generic_init_request, > + .pg_rpcbind_set =3D svc_generic_rpcbind_set, > + } > +#endif /* IS_ENABLED(CONFIG_NFSD_LOCALIO) */ > }; > =20 > bool nfsd_support_version(int vers) > @@ -949,7 +970,7 @@ nfsd(void *vrqstp) > } > =20 > /** > - * nfsd_dispatch - Process an NFS or NFSACL Request > + * nfsd_dispatch - Process an NFS or NFSACL or LOCALIO Request > * @rqstp: incoming request > * > * This RPC dispatcher integrates the NFS server's duplicate reply cache= . > diff --git a/include/linux/nfs.h b/include/linux/nfs.h > index ceb70a926b95..5ff1a5b3b00c 100644 > --- a/include/linux/nfs.h > +++ b/include/linux/nfs.h > @@ -13,6 +13,13 @@ > #include > #include > =20 > +/* The localio program is entirely private to Linux and is > + * NOT part of the uapi. > + */ > +#define NFS_LOCALIO_PROGRAM 400122 > +#define LOCALIOPROC_NULL 0 > +#define LOCALIOPROC_UUID_IS_LOCAL 1 > + > /* > * This is the kernel NFS client file handle representation > */ Reviewed-by: Jeff Layton