Initial import

1 files changed, 549 insertions, 0 deletions

diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
new file mode 100644
index 000000000..21171f0c6
--- /dev/null
+++ b/fs/lockd/svcproc.c
@@ -0,0 +1,549 @@
+/*
+ * linux/fs/lockd/svcproc.c
+ *
+ * Lockd server procedures. We don't implement the NLM_*_RES 
+ * procedures because we don't use the async procedures.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/time.h>
+#include <linux/lockd/lockd.h>
+#include <linux/lockd/share.h>
+#include <linux/sunrpc/svc_xprt.h>
+
+#define NLMDBG_FACILITY		NLMDBG_CLIENT
+
+#ifdef CONFIG_LOCKD_V4
+static __be32
+cast_to_nlm(__be32 status, u32 vers)
+{
+	/* Note: status is assumed to be in network byte order !!! */
+	if (vers != 4){
+		switch (status) {
+		case nlm_granted:
+		case nlm_lck_denied:
+		case nlm_lck_denied_nolocks:
+		case nlm_lck_blocked:
+		case nlm_lck_denied_grace_period:
+		case nlm_drop_reply:
+			break;
+		case nlm4_deadlock:
+			status = nlm_lck_denied;
+			break;
+		default:
+			status = nlm_lck_denied_nolocks;
+		}
+	}
+
+	return (status);
+}
+#define	cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
+#else
+#define cast_status(status) (status)
+#endif
+
+/*
+ * Obtain client and file from arguments
+ */
+static __be32
+nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
+			struct nlm_host **hostp, struct nlm_file **filp)
+{
+	struct nlm_host		*host = NULL;
+	struct nlm_file		*file = NULL;
+	struct nlm_lock		*lock = &argp->lock;
+	__be32			error = 0;
+
+	/* nfsd callbacks must have been installed for this procedure */
+	if (!nlmsvc_ops)
+		return nlm_lck_denied_nolocks;
+
+	/* Obtain host handle */
+	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
+	 || (argp->monitor && nsm_monitor(host) < 0))
+		goto no_locks;
+	*hostp = host;
+
+	/* Obtain file pointer. Not used by FREE_ALL call. */
+	if (filp != NULL) {
+		error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
+		if (error != 0)
+			goto no_locks;
+		*filp = file;
+
+		/* Set up the missing parts of the file_lock structure */
+		lock->fl.fl_file  = file->f_file;
+		lock->fl.fl_owner = (fl_owner_t) host;
+		lock->fl.fl_lmops = &nlmsvc_lock_operations;
+	}
+
+	return 0;
+
+no_locks:
+	nlmsvc_release_host(host);
+	if (error)
+		return error;
+	return nlm_lck_denied_nolocks;
+}
+
+/*
+ * NULL: Test for presence of service
+ */
+static __be32
+nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
+{
+	dprintk("lockd: NULL          called\n");
+	return rpc_success;
+}
+
+/*
+ * TEST: Check for conflicting lock
+ */
+static __be32
+nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
+				         struct nlm_res  *resp)
+{
+	struct nlm_host	*host;
+	struct nlm_file	*file;
+	__be32 rc = rpc_success;
+
+	dprintk("lockd: TEST          called\n");
+	resp->cookie = argp->cookie;
+
+	/* Obtain client and file */
+	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+	/* Now check for conflicting locks */
+	resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
+	if (resp->status == nlm_drop_reply)
+		rc = rpc_drop_reply;
+	else
+		dprintk("lockd: TEST          status %d vers %d\n",
+			ntohl(resp->status), rqstp->rq_vers);
+
+	nlmsvc_release_host(host);
+	nlm_release_file(file);
+	return rc;
+}
+
+static __be32
+nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
+				         struct nlm_res  *resp)
+{
+	struct nlm_host	*host;
+	struct nlm_file	*file;
+	__be32 rc = rpc_success;
+
+	dprintk("lockd: LOCK          called\n");
+
+	resp->cookie = argp->cookie;
+
+	/* Obtain client and file */
+	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+#if 0
+	/* If supplied state doesn't match current state, we assume it's
+	 * an old request that time-warped somehow. Any error return would
+	 * do in this case because it's irrelevant anyway.
+	 *
+	 * NB: We don't retrieve the remote host's state yet.
+	 */
+	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
+		resp->status = nlm_lck_denied_nolocks;
+	} else
+#endif
+
+	/* Now try to lock the file */
+	resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
+					       argp->block, &argp->cookie,
+					       argp->reclaim));
+	if (resp->status == nlm_drop_reply)
+		rc = rpc_drop_reply;
+	else
+		dprintk("lockd: LOCK         status %d\n", ntohl(resp->status));
+
+	nlmsvc_release_host(host);
+	nlm_release_file(file);
+	return rc;
+}
+
+static __be32
+nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
+				           struct nlm_res  *resp)
+{
+	struct nlm_host	*host;
+	struct nlm_file	*file;
+	struct net *net = SVC_NET(rqstp);
+
+	dprintk("lockd: CANCEL        called\n");
+
+	resp->cookie = argp->cookie;
+
+	/* Don't accept requests during grace period */
+	if (locks_in_grace(net)) {
+		resp->status = nlm_lck_denied_grace_period;
+		return rpc_success;
+	}
+
+	/* Obtain client and file */
+	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+	/* Try to cancel request. */
+	resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));
+
+	dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
+	nlmsvc_release_host(host);
+	nlm_release_file(file);
+	return rpc_success;
+}
+
+/*
+ * UNLOCK: release a lock
+ */
+static __be32
+nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
+				           struct nlm_res  *resp)
+{
+	struct nlm_host	*host;
+	struct nlm_file	*file;
+	struct net *net = SVC_NET(rqstp);
+
+	dprintk("lockd: UNLOCK        called\n");
+
+	resp->cookie = argp->cookie;
+
+	/* Don't accept new lock requests during grace period */
+	if (locks_in_grace(net)) {
+		resp->status = nlm_lck_denied_grace_period;
+		return rpc_success;
+	}
+
+	/* Obtain client and file */
+	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+	/* Now try to remove the lock */
+	resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
+
+	dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
+	nlmsvc_release_host(host);
+	nlm_release_file(file);
+	return rpc_success;
+}
+
+/*
+ * GRANTED: A server calls us to tell that a process' lock request
+ * was granted
+ */
+static __be32
+nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
+				            struct nlm_res  *resp)
+{
+	resp->cookie = argp->cookie;
+
+	dprintk("lockd: GRANTED       called\n");
+	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
+	dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
+	return rpc_success;
+}
+
+/*
+ * This is the generic lockd callback for async RPC calls
+ */
+static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
+{
+	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
+			-task->tk_status);
+}
+
+void nlmsvc_release_call(struct nlm_rqst *call)
+{
+	if (!atomic_dec_and_test(&call->a_count))
+		return;
+	nlmsvc_release_host(call->a_host);
+	kfree(call);
+}
+
+static void nlmsvc_callback_release(void *data)
+{
+	nlmsvc_release_call(data);
+}
+
+static const struct rpc_call_ops nlmsvc_callback_ops = {
+	.rpc_call_done = nlmsvc_callback_exit,
+	.rpc_release = nlmsvc_callback_release,
+};
+
+/*
+ * `Async' versions of the above service routines. They aren't really,
+ * because we send the callback before the reply proper. I hope this
+ * doesn't break any clients.
+ */
+static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
+		__be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
+{
+	struct nlm_host	*host;
+	struct nlm_rqst	*call;
+	__be32 stat;
+
+	host = nlmsvc_lookup_host(rqstp,
+				  argp->lock.caller,
+				  argp->lock.len);
+	if (host == NULL)
+		return rpc_system_err;
+
+	call = nlm_alloc_call(host);
+	nlmsvc_release_host(host);
+	if (call == NULL)
+		return rpc_system_err;
+
+	stat = func(rqstp, argp, &call->a_res);
+	if (stat != 0) {
+		nlmsvc_release_call(call);
+		return stat;
+	}
+
+	call->a_flags = RPC_TASK_ASYNC;
+	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
+		return rpc_system_err;
+	return rpc_success;
+}
+
+static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+					     void	     *resp)
+{
+	dprintk("lockd: TEST_MSG      called\n");
+	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
+}
+
+static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+					     void	     *resp)
+{
+	dprintk("lockd: LOCK_MSG      called\n");
+	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
+}
+
+static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+					       void	       *resp)
+{
+	dprintk("lockd: CANCEL_MSG    called\n");
+	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
+}
+
+static __be32
+nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                               void            *resp)
+{
+	dprintk("lockd: UNLOCK_MSG    called\n");
+	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
+}
+
+static __be32
+nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
+                                                void            *resp)
+{
+	dprintk("lockd: GRANTED_MSG   called\n");
+	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
+}
+
+/*
+ * SHARE: create a DOS share or alter existing share.
+ */
+static __be32
+nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
+				          struct nlm_res  *resp)
+{
+	struct nlm_host	*host;
+	struct nlm_file	*file;
+
+	dprintk("lockd: SHARE         called\n");
+
+	resp->cookie = argp->cookie;
+
+	/* Don't accept new lock requests during grace period */
+	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
+		resp->status = nlm_lck_denied_grace_period;
+		return rpc_success;
+	}
+
+	/* Obtain client and file */
+	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+	/* Now try to create the share */
+	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
+
+	dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
+	nlmsvc_release_host(host);
+	nlm_release_file(file);
+	return rpc_success;
+}
+
+/*
+ * UNSHARE: Release a DOS share.
+ */
+static __be32
+nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
+				            struct nlm_res  *resp)
+{
+	struct nlm_host	*host;
+	struct nlm_file	*file;
+
+	dprintk("lockd: UNSHARE       called\n");
+
+	resp->cookie = argp->cookie;
+
+	/* Don't accept requests during grace period */
+	if (locks_in_grace(SVC_NET(rqstp))) {
+		resp->status = nlm_lck_denied_grace_period;
+		return rpc_success;
+	}
+
+	/* Obtain client and file */
+	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+	/* Now try to unshare the file */
+	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
+
+	dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
+	nlmsvc_release_host(host);
+	nlm_release_file(file);
+	return rpc_success;
+}
+
+/*
+ * NM_LOCK: Create an unmonitored lock
+ */
+static __be32
+nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
+				            struct nlm_res  *resp)
+{
+	dprintk("lockd: NM_LOCK       called\n");
+
+	argp->monitor = 0;		/* just clean the monitor flag */
+	return nlmsvc_proc_lock(rqstp, argp, resp);
+}
+
+/*
+ * FREE_ALL: Release all locks and shares held by client
+ */
+static __be32
+nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
+					     void            *resp)
+{
+	struct nlm_host	*host;
+
+	/* Obtain client */
+	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
+		return rpc_success;
+
+	nlmsvc_free_host_resources(host);
+	nlmsvc_release_host(host);
+	return rpc_success;
+}
+
+/*
+ * SM_NOTIFY: private callback from statd (not part of official NLM proto)
+ */
+static __be32
+nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
+					      void	        *resp)
+{
+	dprintk("lockd: SM_NOTIFY     called\n");
+
+	if (!nlm_privileged_requester(rqstp)) {
+		char buf[RPC_MAX_ADDRBUFLEN];
+		printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
+				svc_print_addr(rqstp, buf, sizeof(buf)));
+		return rpc_system_err;
+	}
+
+	nlm_host_rebooted(argp);
+	return rpc_success;
+}
+
+/*
+ * client sent a GRANTED_RES, let's remove the associated block
+ */
+static __be32
+nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
+                                                void            *resp)
+{
+	if (!nlmsvc_ops)
+		return rpc_success;
+
+	dprintk("lockd: GRANTED_RES   called\n");
+
+	nlmsvc_grant_reply(&argp->cookie, argp->status);
+	return rpc_success;
+}
+
+/*
+ * NLM Server procedures.
+ */
+
+#define nlmsvc_encode_norep	nlmsvc_encode_void
+#define nlmsvc_decode_norep	nlmsvc_decode_void
+#define nlmsvc_decode_testres	nlmsvc_decode_void
+#define nlmsvc_decode_lockres	nlmsvc_decode_void
+#define nlmsvc_decode_unlockres	nlmsvc_decode_void
+#define nlmsvc_decode_cancelres	nlmsvc_decode_void
+#define nlmsvc_decode_grantedres	nlmsvc_decode_void
+
+#define nlmsvc_proc_none	nlmsvc_proc_null
+#define nlmsvc_proc_test_res	nlmsvc_proc_null
+#define nlmsvc_proc_lock_res	nlmsvc_proc_null
+#define nlmsvc_proc_cancel_res	nlmsvc_proc_null
+#define nlmsvc_proc_unlock_res	nlmsvc_proc_null
+
+struct nlm_void			{ int dummy; };
+
+#define PROC(name, xargt, xrest, argt, rest, respsize)	\
+ { .pc_func	= (svc_procfunc) nlmsvc_proc_##name,	\
+   .pc_decode	= (kxdrproc_t) nlmsvc_decode_##xargt,	\
+   .pc_encode	= (kxdrproc_t) nlmsvc_encode_##xrest,	\
+   .pc_release	= NULL,					\
+   .pc_argsize	= sizeof(struct nlm_##argt),		\
+   .pc_ressize	= sizeof(struct nlm_##rest),		\
+   .pc_xdrressize = respsize,				\
+ }
+
+#define	Ck	(1+XDR_QUADLEN(NLM_MAXCOOKIELEN))	/* cookie */
+#define	St	1				/* status */
+#define	No	(1+1024/4)			/* Net Obj */
+#define	Rg	2				/* range - offset + size */
+
+struct svc_procedure		nlmsvc_procedures[] = {
+  PROC(null,		void,		void,		void,	void, 1),
+  PROC(test,		testargs,	testres,	args,	res, Ck+St+2+No+Rg),
+  PROC(lock,		lockargs,	res,		args,	res, Ck+St),
+  PROC(cancel,		cancargs,	res,		args,	res, Ck+St),
+  PROC(unlock,		unlockargs,	res,		args,	res, Ck+St),
+  PROC(granted,		testargs,	res,		args,	res, Ck+St),
+  PROC(test_msg,	testargs,	norep,		args,	void, 1),
+  PROC(lock_msg,	lockargs,	norep,		args,	void, 1),
+  PROC(cancel_msg,	cancargs,	norep,		args,	void, 1),
+  PROC(unlock_msg,	unlockargs,	norep,		args,	void, 1),
+  PROC(granted_msg,	testargs,	norep,		args,	void, 1),
+  PROC(test_res,	testres,	norep,		res,	void, 1),
+  PROC(lock_res,	lockres,	norep,		res,	void, 1),
+  PROC(cancel_res,	cancelres,	norep,		res,	void, 1),
+  PROC(unlock_res,	unlockres,	norep,		res,	void, 1),
+  PROC(granted_res,	res,		norep,		res,	void, 1),
+  /* statd callback */
+  PROC(sm_notify,	reboot,		void,		reboot,	void, 1),
+  PROC(none,		void,		void,		void,	void, 1),
+  PROC(none,		void,		void,		void,	void, 1),
+  PROC(none,		void,		void,		void,	void, 1),
+  PROC(share,		shareargs,	shareres,	args,	res, Ck+St+1),
+  PROC(unshare,		shareargs,	shareres,	args,	res, Ck+St+1),
+  PROC(nm_lock,		lockargs,	res,		args,	res, Ck+St),
+  PROC(free_all,	notify,		void,		args,	void, 0),
+
+};