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Commit cb73a9f4 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

nfsd4: implement backchannel_ctl operation 



This operation is mandatory for servers to implement.

Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent c6bb3ca2

Documentation/filesystems/nfs/nfs41-server.txt

+1 −6
Original line number Diff line number Diff line
@@ -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   |

fs/nfsd/nfs4proc.c

+6 −0
Original line number Diff line number Diff line
@@ -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

fs/nfsd/nfs4state.c

+14 −0
Original line number Diff line number Diff line
@@ -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)

fs/nfsd/nfs4xdr.c

+12 −1
Original line number Diff line number Diff line
@@ -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,

fs/nfsd/state.h

+5 −0
Original line number Diff line number Diff line
@@ -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;