From cb73a9f4649bf63c0397e565a15abf8a91ecf56f Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Thu, 1 Nov 2012 18:09:48 -0400 Subject: [PATCH] nfsd4: implement backchannel_ctl operation This operation is mandatory for servers to implement. Signed-off-by: J. Bruce Fields --- Documentation/filesystems/nfs/nfs41-server.txt | 7 +------ fs/nfsd/nfs4proc.c | 6 ++++++ fs/nfsd/nfs4state.c | 14 ++++++++++++++ fs/nfsd/nfs4xdr.c | 13 ++++++++++++- fs/nfsd/state.h | 5 +++++ fs/nfsd/xdr4.h | 2 ++ 6 files changed, 40 insertions(+), 7 deletions(-) diff --git a/Documentation/filesystems/nfs/nfs41-server.txt b/Documentation/filesystems/nfs/nfs41-server.txt index 092fad92a3f0..f5ddff2da302 100644 --- a/Documentation/filesystems/nfs/nfs41-server.txt +++ b/Documentation/filesystems/nfs/nfs41-server.txt @@ -39,11 +39,6 @@ interoperability problems with future clients. Known issues: from a linux client are possible, but we aren't really conformant with the spec (for example, we don't use kerberos on the backchannel correctly). - - Incomplete backchannel support: incomplete backchannel gss - support and no support for BACKCHANNEL_CTL mean that - callbacks (hence delegations and layouts) may not be - available and clients confused by the incomplete - implementation may fail. - We do not support SSV, which provides security for shared client-server state (thus preventing unauthorized tampering with locks and opens, for example). It is mandatory for @@ -89,7 +84,7 @@ Operations | | MNI | or OPT) | | +----------------------+------------+--------------+----------------+ | ACCESS | REQ | | Section 18.1 | -NS | BACKCHANNEL_CTL | REQ | | Section 18.33 | +I | BACKCHANNEL_CTL | REQ | | Section 18.33 | I | BIND_CONN_TO_SESSION | REQ | | Section 18.34 | | CLOSE | REQ | | Section 18.2 | | COMMIT | REQ | | Section 18.3 | diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 6c9a4b291dba..f955176f1b6f 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1666,6 +1666,12 @@ static struct nfsd4_operation nfsd4_ops[] = { .op_name = "OP_EXCHANGE_ID", .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize, }, + [OP_BACKCHANNEL_CTL] = { + .op_func = (nfsd4op_func)nfsd4_backchannel_ctl, + .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING, + .op_name = "OP_BACKCHANNEL_CTL", + .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize, + }, [OP_BIND_CONN_TO_SESSION] = { .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session, .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index dbbbd2fe5236..4023e77687ee 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1865,6 +1865,20 @@ static __be32 nfsd4_map_bcts_dir(u32 *dir) return nfserr_inval; } +__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc) +{ + struct nfsd4_session *session = cstate->session; + + spin_lock(&client_lock); + session->se_cb_prog = bc->bc_cb_program; + session->se_cb_sec = bc->bc_cb_sec; + spin_unlock(&client_lock); + + nfsd4_probe_callback(session->se_client); + + return nfs_ok; +} + __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_bind_conn_to_session *bcts) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 511f980b605c..d7e7c110246e 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -483,6 +483,17 @@ static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_ DECODE_TAIL; } +static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc) +{ + DECODE_HEAD; + + READ_BUF(4); + READ32(bc->bc_cb_program); + nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); + + DECODE_TAIL; +} + static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts) { DECODE_HEAD; @@ -1536,7 +1547,7 @@ static nfsd4_dec nfsd41_dec_ops[] = { [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_notsupp, /* new operations for NFSv4.1 */ - [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_notsupp, + [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl, [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session, [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id, [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session, diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h index bff856c34a32..758bc9c2646b 100644 --- a/fs/nfsd/state.h +++ b/fs/nfsd/state.h @@ -166,6 +166,11 @@ struct nfsd4_create_session { struct nfsd4_cb_sec cb_sec; }; +struct nfsd4_backchannel_ctl { + u32 bc_cb_program; + struct nfsd4_cb_sec bc_cb_sec; +}; + struct nfsd4_bind_conn_to_session { struct nfs4_sessionid sessionid; u32 dir; diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h index acd127d4ee82..71c5c47f2750 100644 --- a/fs/nfsd/xdr4.h +++ b/fs/nfsd/xdr4.h @@ -462,6 +462,7 @@ struct nfsd4_op { /* NFSv4.1 */ struct nfsd4_exchange_id exchange_id; + struct nfsd4_backchannel_ctl backchannel_ctl; struct nfsd4_bind_conn_to_session bind_conn_to_session; struct nfsd4_create_session create_session; struct nfsd4_destroy_session destroy_session; @@ -566,6 +567,7 @@ extern __be32 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, struct nfsd4_sequence *seq); extern __be32 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *, struct nfsd4_exchange_id *); +extern __be32 nfsd4_backchannel_ctl(struct svc_rqst *, struct nfsd4_compound_state *, struct nfsd4_backchannel_ctl *); extern __be32 nfsd4_bind_conn_to_session(struct svc_rqst *, struct nfsd4_compound_state *, struct nfsd4_bind_conn_to_session *); extern __be32 nfsd4_create_session(struct svc_rqst *, struct nfsd4_compound_state *, -- 2.20.1