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Commit 79969dd1 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4.1: Clean up create_session 



Don't decode directly into the shared struct session

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 65d2918e

fs/nfs/nfs4proc.c

+29 −13
Original line number Diff line number Diff line
@@ -7166,10 +7166,11 @@ static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args) 
		args->bc_attrs.max_reqs);

}



static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)

static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,

		struct nfs41_create_session_res *res)

{

	struct nfs4_channel_attrs *sent = &args->fc_attrs;

	struct nfs4_channel_attrs *rcvd = &session->fc_attrs;

	struct nfs4_channel_attrs *rcvd = &res->fc_attrs;



	if (rcvd->max_resp_sz > sent->max_resp_sz)

		return -EINVAL;
@@ -7188,10 +7189,11 @@ static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args 
	return 0;

}



static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)

static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,

		struct nfs41_create_session_res *res)

{

	struct nfs4_channel_attrs *sent = &args->bc_attrs;

	struct nfs4_channel_attrs *rcvd = &session->bc_attrs;

	struct nfs4_channel_attrs *rcvd = &res->bc_attrs;



	if (rcvd->max_rqst_sz > sent->max_rqst_sz)

		return -EINVAL;
@@ -7208,14 +7210,23 @@ static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args 
}



static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,

				     struct nfs4_session *session)

				     struct nfs41_create_session_res *res)

{

	int ret;



	ret = nfs4_verify_fore_channel_attrs(args, session);

	ret = nfs4_verify_fore_channel_attrs(args, res);

	if (ret)

		return ret;

	return nfs4_verify_back_channel_attrs(args, session);

	return nfs4_verify_back_channel_attrs(args, res);

}



static void nfs4_update_session(struct nfs4_session *session,

		struct nfs41_create_session_res *res)

{

	nfs4_copy_sessionid(&session->sess_id, &res->sessionid);

	session->flags = res->flags;

	memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));

	memcpy(&session->bc_attrs, &res->bc_attrs, sizeof(session->bc_attrs));

}



static int _nfs4_proc_create_session(struct nfs_client *clp,
@@ -7224,11 +7235,12 @@ static int _nfs4_proc_create_session(struct nfs_client *clp, 
	struct nfs4_session *session = clp->cl_session;

	struct nfs41_create_session_args args = {

		.client = clp,

		.clientid = clp->cl_clientid,

		.seqid = clp->cl_seqid,

		.cb_program = NFS4_CALLBACK,

	};

	struct nfs41_create_session_res res = {

		.client = clp,

	};

	struct nfs41_create_session_res res;



	struct rpc_message msg = {

		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],

		.rpc_argp = &args,
@@ -7245,11 +7257,15 @@ static int _nfs4_proc_create_session(struct nfs_client *clp, 


	if (!status) {

		/* Verify the session's negotiated channel_attrs values */

		status = nfs4_verify_channel_attrs(&args, session);

		status = nfs4_verify_channel_attrs(&args, &res);

		/* Increment the clientid slot sequence id */

		if (clp->cl_seqid == res.seqid)

			clp->cl_seqid++;

		if (status)

			goto out;

		nfs4_update_session(session, &res);

	}



out:

	return status;

}

fs/nfs/nfs4session.h

+6 −0
Original line number Diff line number Diff line
@@ -118,6 +118,12 @@ static inline int nfs4_has_persistent_session(const struct nfs_client *clp) 
	return 0;

}



static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst,

		const struct nfs4_sessionid *src)

{

	memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN);

}



#ifdef CONFIG_CRC32

/*

 * nfs_session_id_hash - calculate the crc32 hash for the session id

fs/nfs/nfs4xdr.c

+7 −9
Original line number Diff line number Diff line
@@ -1806,8 +1806,8 @@ static void encode_create_session(struct xdr_stream *xdr, 


	encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);

	p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);

	p = xdr_encode_hyper(p, clp->cl_clientid);

	*p++ = cpu_to_be32(clp->cl_seqid);			/*Sequence id */

	p = xdr_encode_hyper(p, args->clientid);

	*p++ = cpu_to_be32(args->seqid);			/*Sequence id */

	*p++ = cpu_to_be32(args->flags);			/*flags */



	/* Fore Channel */
@@ -5641,12 +5641,10 @@ static int decode_create_session(struct xdr_stream *xdr, 
{

	__be32 *p;

	int status;

	struct nfs_client *clp = res->client;

	struct nfs4_session *session = clp->cl_session;



	status = decode_op_hdr(xdr, OP_CREATE_SESSION);

	if (!status)

		status = decode_sessionid(xdr, &session->sess_id);

		status = decode_sessionid(xdr, &res->sessionid);

	if (unlikely(status))

		return status;
@@ -5654,13 +5652,13 @@ static int decode_create_session(struct xdr_stream *xdr, 
	p = xdr_inline_decode(xdr, 8);

	if (unlikely(!p))

		goto out_overflow;

	clp->cl_seqid = be32_to_cpup(p++);

	session->flags = be32_to_cpup(p);

	res->seqid = be32_to_cpup(p++);

	res->flags = be32_to_cpup(p);



	/* Channel attributes */

	status = decode_chan_attrs(xdr, &session->fc_attrs);

	status = decode_chan_attrs(xdr, &res->fc_attrs);

	if (!status)

		status = decode_chan_attrs(xdr, &session->bc_attrs);

		status = decode_chan_attrs(xdr, &res->bc_attrs);

	return status;

out_overflow:

	print_overflow_msg(__func__, xdr);

include/linux/nfs_xdr.h

+7 −1
Original line number Diff line number Diff line
@@ -1185,6 +1185,8 @@ struct nfs41_exchange_id_res { 


struct nfs41_create_session_args {

	struct nfs_client	       *client;

	u64				clientid;

	uint32_t			seqid;

	uint32_t			flags;

	uint32_t			cb_program;

	struct nfs4_channel_attrs	fc_attrs;	/* Fore Channel */
@@ -1192,7 +1194,11 @@ struct nfs41_create_session_args { 
};



struct nfs41_create_session_res {

	struct nfs_client	       *client;

	struct nfs4_sessionid		sessionid;

	uint32_t			seqid;

	uint32_t			flags;

	struct nfs4_channel_attrs	fc_attrs;	/* Fore Channel */

	struct nfs4_channel_attrs	bc_attrs;	/* Back Channel */

};



struct nfs41_reclaim_complete_args {