X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=blobdiff_plain;f=fs%2Fnfsd%2Fnfs4callback.c;h=f4fab69a8c30c7fc5f733cde9dd961c2875b349a;hp=c17a5202ee3f3c6e9a6ecef4597509febcab97f9;hb=63e4863fabc6e165a6ca813051305be58966da45;hpb=2b47eece1fa519a81c8b802af77a8b8aa44baa10

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index c17a520..f4fab69 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -53,9 +53,6 @@
 #define NFSPROC4_CB_NULL 0
 #define NFSPROC4_CB_COMPOUND 1
 
-/* declarations */
-static const struct rpc_call_ops nfs4_cb_null_ops;
-
 /* Index of predefined Linux callback client operations */
 
 enum {
@@ -104,7 +101,7 @@ xdr_writemem(__be32 *p, const void *ptr, int nbytes)
 } while (0)
 #define RESERVE_SPACE(nbytes)   do {                            \
 	p = xdr_reserve_space(xdr, nbytes);                     \
-	if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __FUNCTION__); \
+	if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \
 	BUG_ON(!p);                                             \
 } while (0)
 
@@ -134,7 +131,7 @@ xdr_error:                                      \
 	p = xdr_inline_decode(xdr, nbytes); \
 	if (!p) { \
 		dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
-			__FUNCTION__, __LINE__); \
+			__func__, __LINE__); \
 		return -EIO; \
 	} \
 } while (0)
@@ -218,17 +215,18 @@ encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
 }
 
 static int
-encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec)
+encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp)
 {
 	__be32 *p;
-	int len = cb_rec->cbr_fhlen;
+	int len = dp->dl_fh.fh_size;
 
-	RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len);
+	RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len);
 	WRITE32(OP_CB_RECALL);
-	WRITEMEM(&cb_rec->cbr_stateid, sizeof(stateid_t));
-	WRITE32(cb_rec->cbr_trunc);
+	WRITE32(dp->dl_stateid.si_generation);
+	WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t));
+	WRITE32(0); /* truncate optimization not implemented */
 	WRITE32(len);
-	WRITEMEM(cb_rec->cbr_fhval, len);
+	WRITEMEM(&dp->dl_fh.fh_base, len);
 	return 0;
 }
 
@@ -243,11 +241,11 @@ nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
 }
 
 static int
-nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_cb_recall *args)
+nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_delegation *args)
 {
 	struct xdr_stream xdr;
 	struct nfs4_cb_compound_hdr hdr = {
-		.ident = args->cbr_ident,
+		.ident = args->dl_ident,
 		.nops   = 1,
 	};
 
@@ -344,86 +342,54 @@ static struct rpc_version *	nfs_cb_version[] = {
 	&nfs_cb_version4,
 };
 
-/*
- * Use the SETCLIENTID credential
- */
-static struct rpc_cred *
-nfsd4_lookupcred(struct nfs4_client *clp, int taskflags)
+static struct rpc_program cb_program;
+
+static struct rpc_stat cb_stats = {
+		.program	= &cb_program
+};
+
+#define NFS4_CALLBACK 0x40000000
+static struct rpc_program cb_program = {
+		.name 		= "nfs4_cb",
+		.number		= NFS4_CALLBACK,
+		.nrvers		= ARRAY_SIZE(nfs_cb_version),
+		.version	= nfs_cb_version,
+		.stats		= &cb_stats,
+		.pipe_dir_name  = "/nfsd4_cb",
+};
+
+static int max_cb_time(void)
 {
-        struct auth_cred acred;
-	struct rpc_clnt *clnt = clp->cl_callback.cb_client;
-	struct rpc_cred *ret;
-
-        get_group_info(clp->cl_cred.cr_group_info);
-        acred.uid = clp->cl_cred.cr_uid;
-        acred.gid = clp->cl_cred.cr_gid;
-        acred.group_info = clp->cl_cred.cr_group_info;
-
-        dprintk("NFSD:     looking up %s cred\n",
-                clnt->cl_auth->au_ops->au_name);
-        ret = rpcauth_lookup_credcache(clnt->cl_auth, &acred, taskflags);
-        put_group_info(clp->cl_cred.cr_group_info);
-        return ret;
+	return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ;
 }
 
 /* Reference counting, callback cleanup, etc., all look racy as heck.
  * And why is cb_set an atomic? */
 
-static int do_probe_callback(void *data)
-{
-	struct nfs4_client *clp = data;
-	struct nfs4_callback *cb = &clp->cl_callback;
-	struct rpc_message msg = {
-		.rpc_proc       = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
-		.rpc_argp       = clp,
-	};
-	int status;
-
-	msg.rpc_cred = nfsd4_lookupcred(clp, 0);
-	if (IS_ERR(msg.rpc_cred))
-		goto out;
-	status = rpc_call_sync(cb->cb_client, &msg, RPC_TASK_SOFT);
-	put_rpccred(msg.rpc_cred);
-
-	if (status) {
-		rpc_shutdown_client(cb->cb_client);
-		cb->cb_client = NULL;
-	} else
-		atomic_set(&cb->cb_set, 1);
-out:
-	put_nfs4_client(clp);
-	return 0;
-}
-
-/*
- * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
- */
-void
-nfsd4_probe_callback(struct nfs4_client *clp)
+int setup_callback_client(struct nfs4_client *clp)
 {
 	struct sockaddr_in	addr;
-	struct nfs4_callback    *cb = &clp->cl_callback;
+	struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
 	struct rpc_timeout	timeparms = {
-		.to_initval	= (NFSD_LEASE_TIME/4) * HZ,
-		.to_retries	= 5,
-		.to_maxval	= (NFSD_LEASE_TIME/2) * HZ,
-		.to_exponential	= 1,
+		.to_initval	= max_cb_time(),
+		.to_retries	= 0,
 	};
-	struct rpc_program *	program = &cb->cb_program;
 	struct rpc_create_args args = {
 		.protocol	= IPPROTO_TCP,
 		.address	= (struct sockaddr *)&addr,
 		.addrsize	= sizeof(addr),
 		.timeout	= &timeparms,
-		.program	= program,
+		.program	= &cb_program,
+		.prognumber	= cb->cb_prog,
 		.version	= nfs_cb_version[1]->number,
-		.authflavor	= RPC_AUTH_UNIX,	/* XXX: need AUTH_GSS... */
-		.flags		= (RPC_CLNT_CREATE_NOPING),
+		.authflavor	= clp->cl_flavor,
+		.flags		= (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
+		.client_name    = clp->cl_principal,
 	};
-	struct task_struct *t;
+	struct rpc_clnt *client;
 
-	if (atomic_read(&cb->cb_set))
-		return;
+	if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
+		return -EINVAL;
 
 	/* Initialize address */
 	memset(&addr, 0, sizeof(addr));
@@ -431,94 +397,166 @@ nfsd4_probe_callback(struct nfs4_client *clp)
 	addr.sin_port = htons(cb->cb_port);
 	addr.sin_addr.s_addr = htonl(cb->cb_addr);
 
-	/* Initialize rpc_program */
-	program->name = "nfs4_cb";
-	program->number = cb->cb_prog;
-	program->nrvers = ARRAY_SIZE(nfs_cb_version);
-	program->version = nfs_cb_version;
-	program->stats = &cb->cb_stat;
+	/* Create RPC client */
+	client = rpc_create(&args);
+	if (IS_ERR(client)) {
+		dprintk("NFSD: couldn't create callback client: %ld\n",
+			PTR_ERR(client));
+		return PTR_ERR(client);
+	}
+	cb->cb_client = client;
+	return 0;
 
-	/* Initialize rpc_stat */
-	memset(program->stats, 0, sizeof(cb->cb_stat));
-	program->stats->program = program;
+}
 
-	/* Create RPC client */
-	cb->cb_client = rpc_create(&args);
-	if (IS_ERR(cb->cb_client)) {
-		dprintk("NFSD: couldn't create callback client\n");
-		goto out_err;
+static void warn_no_callback_path(struct nfs4_client *clp, int reason)
+{
+	dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
+		(int)clp->cl_name.len, clp->cl_name.data, reason);
+}
+
+static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_client *clp = calldata;
+
+	if (task->tk_status)
+		warn_no_callback_path(clp, task->tk_status);
+	else
+		atomic_set(&clp->cl_cb_conn.cb_set, 1);
+	put_nfs4_client(clp);
+}
+
+static const struct rpc_call_ops nfsd4_cb_probe_ops = {
+	.rpc_call_done = nfsd4_cb_probe_done,
+};
+
+static struct rpc_cred *lookup_cb_cred(struct nfs4_cb_conn *cb)
+{
+	struct auth_cred acred = {
+		.machine_cred = 1
+	};
+
+	/*
+	 * Note in the gss case this doesn't actually have to wait for a
+	 * gss upcall (or any calls to the client); this just creates a
+	 * non-uptodate cred which the rpc state machine will fill in with
+	 * a refresh_upcall later.
+	 */
+	return rpcauth_lookup_credcache(cb->cb_client->cl_auth, &acred,
+							RPCAUTH_LOOKUP_NEW);
+}
+
+void do_probe_callback(struct nfs4_client *clp)
+{
+	struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
+	struct rpc_message msg = {
+		.rpc_proc       = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
+		.rpc_argp       = clp,
+	};
+	struct rpc_cred *cred;
+	int status;
+
+	cred = lookup_cb_cred(cb);
+	if (IS_ERR(cred)) {
+		status = PTR_ERR(cred);
+		goto out;
+	}
+	cb->cb_cred = cred;
+	msg.rpc_cred = cb->cb_cred;
+	status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT,
+				&nfsd4_cb_probe_ops, (void *)clp);
+out:
+	if (status) {
+		warn_no_callback_path(clp, status);
+		put_nfs4_client(clp);
+	}
+}
+
+/*
+ * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
+ */
+void
+nfsd4_probe_callback(struct nfs4_client *clp)
+{
+	int status;
+
+	BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set));
+
+	status = setup_callback_client(clp);
+	if (status) {
+		warn_no_callback_path(clp, status);
+		return;
 	}
 
 	/* the task holds a reference to the nfs4_client struct */
 	atomic_inc(&clp->cl_count);
 
-	t = kthread_run(do_probe_callback, clp, "nfs4_cb_probe");
+	do_probe_callback(clp);
+}
+
+static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_delegation *dp = calldata;
+	struct nfs4_client *clp = dp->dl_client;
 
-	if (IS_ERR(t))
-		goto out_release_clp;
+	switch (task->tk_status) {
+	case -EIO:
+		/* Network partition? */
+		atomic_set(&clp->cl_cb_conn.cb_set, 0);
+		warn_no_callback_path(clp, task->tk_status);
+	case -EBADHANDLE:
+	case -NFS4ERR_BAD_STATEID:
+		/* Race: client probably got cb_recall
+		 * before open reply granting delegation */
+		break;
+	default:
+		/* success, or error we can't handle */
+		return;
+	}
+	if (dp->dl_retries--) {
+		rpc_delay(task, 2*HZ);
+		task->tk_status = 0;
+		rpc_restart_call(task);
+	} else {
+		atomic_set(&clp->cl_cb_conn.cb_set, 0);
+		warn_no_callback_path(clp, task->tk_status);
+	}
+}
 
-	return;
+static void nfsd4_cb_recall_release(void *calldata)
+{
+	struct nfs4_delegation *dp = calldata;
+	struct nfs4_client *clp = dp->dl_client;
 
-out_release_clp:
-	atomic_dec(&clp->cl_count);
-	rpc_shutdown_client(cb->cb_client);
-out_err:
-	cb->cb_client = NULL;
-	dprintk("NFSD: warning: no callback path to client %.*s\n",
-		(int)clp->cl_name.len, clp->cl_name.data);
+	nfs4_put_delegation(dp);
+	put_nfs4_client(clp);
 }
 
+static const struct rpc_call_ops nfsd4_cb_recall_ops = {
+	.rpc_call_done = nfsd4_cb_recall_done,
+	.rpc_release = nfsd4_cb_recall_release,
+};
+
 /*
  * called with dp->dl_count inc'ed.
- * nfs4_lock_state() may or may not have been called.
  */
 void
 nfsd4_cb_recall(struct nfs4_delegation *dp)
 {
 	struct nfs4_client *clp = dp->dl_client;
-	struct rpc_clnt *clnt = clp->cl_callback.cb_client;
-	struct nfs4_cb_recall *cbr = &dp->dl_recall;
+	struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
 	struct rpc_message msg = {
 		.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
-		.rpc_argp = cbr,
+		.rpc_argp = dp,
+		.rpc_cred = clp->cl_cb_conn.cb_cred
 	};
-	int retries = 1;
-	int status = 0;
-
-	if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt)
-		return;
-
-	msg.rpc_cred = nfsd4_lookupcred(clp, 0);
-	if (IS_ERR(msg.rpc_cred))
-		goto out;
+	int status;
 
-	cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */
-	cbr->cbr_dp = dp;
-
-	status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
-	while (retries--) {
-		switch (status) {
-			case -EIO:
-				/* Network partition? */
-			case -EBADHANDLE:
-			case -NFS4ERR_BAD_STATEID:
-				/* Race: client probably got cb_recall
-				 * before open reply granting delegation */
-				break;
-			default:
-				goto out_put_cred;
-		}
-		ssleep(2);
-		status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
+	dp->dl_retries = 1;
+	status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
+				&nfsd4_cb_recall_ops, dp);
+	if (status) {
+		put_nfs4_client(clp);
+		nfs4_put_delegation(dp);
 	}
-out_put_cred:
-	put_rpccred(msg.rpc_cred);
-out:
-	if (status == -EIO)
-		atomic_set(&clp->cl_callback.cb_set, 0);
-	/* Success or failure, now we're either waiting for lease expiration
-	 * or deleg_return. */
-	dprintk("NFSD: nfs4_cb_recall: dp %p dl_flock %p dl_count %d\n",dp, dp->dl_flock, atomic_read(&dp->dl_count));
-	nfs4_put_delegation(dp);
-	return;
 }