x86/kprobes: Fix crash when probing CS CALL instructionsgrafted

When using eBPF to probe CS CALL instructions within a function,
a crash can be triggered.

The eBPF tool probes offset 257 of the __hrtimer_run_queues()
function:

<__hrtimer_run_queues+249>:  nopl   0x0(%rax,%rax,1)
<__hrtimer_run_queues+254>:  mov    %r14,%rdi
<__hrtimer_run_queues+257>:  cs call <__x86_indirect_thunk_r12>
<__hrtimer_run_queues+263>:  mov    %eax,%r12d
<__hrtimer_run_queues+266>:  xchg   %ax,%ax
<__hrtimer_run_queues+268>:  mov    %r13,%rdi

Which triggers this crash:

  BUG: unable to handle page fault for address: 00000000000f41c9
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  PGD 0 P4D 0
  Oops: 0002 [#1] SMP NOPTI
  CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P
  RIP: 0010:__hrtimer_run_queues+0x106/0x230

Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is
at the 6th byte of the above CS CALL instruction. Since the CS CALL
instruction occupies 6 bytes, the exception occurred in the middle of that
call instruction.

The root cause is that when using eBPF tools to probe in the middle of a
function, a kprobe with INT3 is used as the underlying implementation.

During single-step emulation of the original CALL instruction,
int3_emulate_call() assumes that the probed CALL instruction is 5 bytes
long. However, the actual CS-prefixed CALL instruction occupies 6 bytes,
so it constructs an incorrect exception return address. When the CPU
returns from the kprobe handler, the next instruction to be executed is at
the address of the last byte of that CS CALL instruction. Coincidentally,
starting from that address, the CPU fetches and decodes a completely
different instruction, which ultimately triggers a kernel crash.

Fix the issue by using the actual instruction length obtained from
the instruction decoder when constructing the exception return
address, rather than relying on the hardcoded CALL_INSN_SIZE macro.

[ mingo: Refined the changelog ]

Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step")
Suggested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Jinke Han <jinkehan@didiglobal.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://patch.msgid.link/20260908073742.GA10517@didi-ThinkCentre-M920t-N000

1 files changed, 1453 insertions, 0 deletions

diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
new file mode 100644
index 000000000..a8b5195c2
--- /dev/null
+++ b/fs/lockd/svcproc.c
@@ -0,0 +1,1453 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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/sunrpc/svc_xprt.h>
+
+#include "lockd.h"
+
+/*
+ * xdr.h defines SM_PRIV_SIZE as a macro. nlm3xdr_gen.h defines
+ * it as an enum constant. Undefine the macro before including
+ * the generated header.
+ */
+#undef SM_PRIV_SIZE
+
+#include "share.h"
+#include "nlm3xdr_gen.h"
+
+/*
+ * Size of an NFSv2 file handle, in bytes, which is 32.
+ * Defined locally to avoid including uapi/linux/nfs2.h.
+ */
+#define NLM3_FHSIZE		32
+
+/*
+ * Wrapper structures combine xdrgen types with legacy lockd_lock.
+ * The xdrgen field must be first so the structure can be cast
+ * to its XDR type for the RPC dispatch layer.
+ */
+struct nlm_testargs_wrapper {
+	struct nlm_testargs		xdrgen;
+	struct lockd_lock		lock;
+};
+
+static_assert(offsetof(struct nlm_testargs_wrapper, xdrgen) == 0);
+
+struct nlm_testres_wrapper {
+	struct nlm_testres		xdrgen;
+	struct lockd_lock		lock;
+};
+
+static_assert(offsetof(struct nlm_testres_wrapper, xdrgen) == 0);
+
+struct nlm_lockargs_wrapper {
+	struct nlm_lockargs		xdrgen;
+	struct lockd_cookie		cookie;
+	struct lockd_lock		lock;
+};
+
+static_assert(offsetof(struct nlm_lockargs_wrapper, xdrgen) == 0);
+
+struct nlm_res_wrapper {
+	struct nlm_res			xdrgen;
+	struct lockd_cookie		cookie;
+};
+
+static_assert(offsetof(struct nlm_res_wrapper, xdrgen) == 0);
+
+struct nlm_cancargs_wrapper {
+	struct nlm_cancargs		xdrgen;
+	struct lockd_lock		lock;
+};
+
+static_assert(offsetof(struct nlm_cancargs_wrapper, xdrgen) == 0);
+
+struct nlm_unlockargs_wrapper {
+	struct nlm_unlockargs		xdrgen;
+	struct lockd_lock		lock;
+};
+
+static_assert(offsetof(struct nlm_unlockargs_wrapper, xdrgen) == 0);
+
+struct nlm_notifyargs_wrapper {
+	struct nlm_notifyargs		xdrgen;
+	struct lockd_reboot		reboot;
+};
+
+static_assert(offsetof(struct nlm_notifyargs_wrapper, xdrgen) == 0);
+
+struct nlm_shareargs_wrapper {
+	struct nlm_shareargs		xdrgen;
+	struct lockd_lock		lock;
+};
+
+static_assert(offsetof(struct nlm_shareargs_wrapper, xdrgen) == 0);
+
+struct nlm_shareres_wrapper {
+	struct nlm_shareres		xdrgen;
+};
+
+static_assert(offsetof(struct nlm_shareres_wrapper, xdrgen) == 0);
+
+struct nlm_notify_wrapper {
+	struct nlm_notify		xdrgen;
+};
+
+static_assert(offsetof(struct nlm_notify_wrapper, xdrgen) == 0);
+
+static __be32
+nlm_netobj_to_cookie(struct lockd_cookie *cookie, netobj *object)
+{
+	if (object->len > NLM_MAXCOOKIELEN)
+		return nlm_lck_denied_nolocks;
+	cookie->len = object->len;
+	memcpy(cookie->data, object->data, object->len);
+	return nlm_granted;
+}
+
+static __be32
+nlm_lock_to_lockd_lock(struct lockd_lock *lock, struct nlm_lock *alock)
+{
+	if (alock->fh.len != NLM3_FHSIZE)
+		return nlm_lck_denied;
+	lock->fh.size = alock->fh.len;
+	memcpy(lock->fh.data, alock->fh.data, alock->fh.len);
+	lock->oh.len = alock->oh.len;
+	lock->oh.data = alock->oh.data;
+	lock->svid = alock->uppid;
+	lockd_set_file_lock_range3(&lock->fl, alock->l_offset, alock->l_len);
+	return nlm_granted;
+}
+
+static struct nlm_host *
+nlm3svc_lookup_host(struct svc_rqst *rqstp, string caller, bool monitored)
+{
+	struct nlm_host *host;
+
+	if (!rcu_access_pointer(nlmsvc_ops))
+		return NULL;
+	host = nlmsvc_lookup_host(rqstp, caller.data, caller.len);
+	if (!host)
+		return NULL;
+	if (monitored && nsm_monitor(host) < 0) {
+		nlmsvc_release_host(host);
+		return NULL;
+	}
+	return host;
+}
+
+static __be32
+nlm3svc_lookup_file(struct svc_rqst *rqstp, struct nlm_host *host,
+		    struct lockd_lock *lock, struct nlm_file **filp,
+		    struct nlm_lock *xdr_lock, unsigned char type)
+{
+	bool is_test = (rqstp->rq_proc == NLMPROC_TEST ||
+			rqstp->rq_proc == NLMPROC_TEST_MSG);
+	struct file_lock *fl = &lock->fl;
+	struct nlm_file *file = NULL;
+	__be32 error;
+	int mode;
+
+	if (xdr_lock->fh.len != NLM3_FHSIZE)
+		return nlm_lck_denied_nolocks;
+	lock->fh.size = xdr_lock->fh.len;
+	memcpy(lock->fh.data, xdr_lock->fh.data, xdr_lock->fh.len);
+
+	lock->oh.len = xdr_lock->oh.len;
+	lock->oh.data = xdr_lock->oh.data;
+
+	lock->svid = xdr_lock->uppid;
+	lock->lock_start = xdr_lock->l_offset;
+	lock->lock_len = xdr_lock->l_len;
+
+	locks_init_lock(fl);
+	fl->c.flc_type = type;
+	lockd_set_file_lock_range3(fl, lock->lock_start, lock->lock_len);
+
+	mode = lock_to_openmode(fl);
+	if (is_test)
+		mode = O_RDWR;
+
+	error = nlm_lookup_file(rqstp, &file, lock, mode);
+	switch (error) {
+	case nlm_granted:
+		break;
+	case nlm__int__stale_fh:
+	case nlm__int__failed:
+		return nlm_lck_denied_nolocks;
+	default:
+		return error;
+	}
+	*filp = file;
+
+	fl->c.flc_flags = FL_POSIX;
+	if (is_test)
+		fl->c.flc_file = nlmsvc_file_file(file);
+	else
+		fl->c.flc_file = file->f_file[mode];
+	fl->c.flc_pid = current->tgid;
+	fl->fl_lmops = &nlmsvc_lock_operations;
+	nlmsvc_locks_init_private(fl, host, (pid_t)lock->svid);
+	if (!fl->c.flc_owner)
+		return nlm_lck_denied_nolocks;
+
+	return nlm_granted;
+}
+
+static inline __be32 cast_status(__be32 status)
+{
+	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__int__drop_reply:
+		break;
+	case nlm__int__deadlock:
+		status = nlm_lck_denied;
+		break;
+	default:
+		pr_warn_once("lockd: unhandled internal status %u\n",
+			     be32_to_cpu(status));
+		status = nlm_lck_denied_nolocks;
+		break;
+	}
+	return status;
+}
+
+/**
+ * nlmsvc_proc_null - NULL: Test for presence of service
+ * @rqstp: RPC transaction context
+ *
+ * Return:
+ *   %rpc_success:		RPC executed successfully
+ *
+ * RPC synopsis:
+ *   void NLM_NULL(void) = 0;
+ */
+static __be32 nlmsvc_proc_null(struct svc_rqst *rqstp)
+{
+	return rpc_success;
+}
+
+/**
+ * nlmsvc_proc_test - TEST: Check for conflicting lock
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *
+ * RPC synopsis:
+ *   nlm_testres NLM_TEST(nlm_testargs) = 1;
+ *
+ * Permissible procedure status codes:
+ *   %LCK_GRANTED:		The server would be able to grant the
+ *				requested lock.
+ *   %LCK_DENIED:		The requested lock conflicted with existing
+ *				lock reservations for the file.
+ *   %LCK_DENIED_NOLOCKS:	The server could not allocate the resources
+ *				needed to process the request.
+ *   %LCK_DENIED_GRACE_PERIOD:	The server has recently restarted and is
+ *				re-establishing existing locks, and is not
+ *				yet ready to accept normal service requests.
+ */
+static __be32 nlmsvc_proc_test(struct svc_rqst *rqstp)
+{
+	struct nlm_testargs_wrapper *argp = rqstp->rq_argp;
+	unsigned char type = argp->xdrgen.exclusive ? F_WRLCK : F_RDLCK;
+	struct nlm_testres_wrapper *resp = rqstp->rq_resp;
+	struct nlm_file *file = NULL;
+	struct nlm_host	*host;
+
+	resp->xdrgen.cookie = argp->xdrgen.cookie;
+
+	resp->xdrgen.test_stat.stat = nlm_lck_denied_nolocks;
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		goto out;
+
+	resp->xdrgen.test_stat.stat =
+		nlm3svc_lookup_file(rqstp, host, &argp->lock, &file,
+				    &argp->xdrgen.alock, type);
+	if (resp->xdrgen.test_stat.stat)
+		goto out;
+
+	resp->xdrgen.test_stat.stat =
+		cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock,
+					    &resp->lock));
+	nlmsvc_release_lockowner(&argp->lock);
+
+	if (resp->xdrgen.test_stat.stat == nlm_lck_denied) {
+		struct lockd_lock *conf = &resp->lock;
+		struct nlm_holder *holder = &resp->xdrgen.test_stat.u.holder;
+
+		holder->exclusive = (conf->fl.c.flc_type != F_RDLCK);
+		holder->uppid = conf->svid;
+		holder->oh.len = conf->oh.len;
+		holder->oh.data = conf->oh.data;
+		holder->l_offset = min_t(loff_t, conf->fl.fl_start,
+					 NLM_OFFSET_MAX);
+		if (conf->fl.fl_end == OFFSET_MAX)
+			holder->l_len = 0;
+		else
+			holder->l_len = min_t(loff_t,
+					      conf->fl.fl_end -
+					      conf->fl.fl_start + 1,
+					      NLM_OFFSET_MAX);
+	}
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->xdrgen.test_stat.stat == nlm__int__drop_reply ?
+		rpc_drop_reply : rpc_success;
+}
+
+static __be32
+nlmsvc_do_lock(struct svc_rqst *rqstp, bool monitored)
+{
+	struct nlm_lockargs_wrapper *argp = rqstp->rq_argp;
+	unsigned char type = argp->xdrgen.exclusive ? F_WRLCK : F_RDLCK;
+	struct nlm_res_wrapper *resp = rqstp->rq_resp;
+	struct nlm_file	*file = NULL;
+	struct nlm_host	*host = NULL;
+
+	resp->xdrgen.cookie = argp->xdrgen.cookie;
+
+	resp->xdrgen.stat.stat = nlm_netobj_to_cookie(&argp->cookie,
+						      &argp->xdrgen.cookie);
+	if (resp->xdrgen.stat.stat)
+		goto out;
+
+	resp->xdrgen.stat.stat = nlm_lck_denied_nolocks;
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name,
+				   monitored);
+	if (!host)
+		goto out;
+
+	resp->xdrgen.stat.stat = nlm3svc_lookup_file(rqstp, host, &argp->lock,
+						     &file, &argp->xdrgen.alock,
+						     type);
+	if (resp->xdrgen.stat.stat)
+		goto out;
+
+	resp->xdrgen.stat.stat = cast_status(nlmsvc_lock(rqstp, file, host,
+							 &argp->lock,
+							 argp->xdrgen.block,
+							 &argp->cookie,
+							 argp->xdrgen.reclaim));
+
+	nlmsvc_release_lockowner(&argp->lock);
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->xdrgen.stat.stat == nlm__int__drop_reply ?
+		rpc_drop_reply : rpc_success;
+}
+
+/**
+ * nlmsvc_proc_lock - LOCK: Establish a monitored lock
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *
+ * RPC synopsis:
+ *   nlm_res NLM_LOCK(nlm_lockargs) = 2;
+ *
+ * Permissible procedure status codes:
+ *   %LCK_GRANTED:		The requested lock was granted.
+ *   %LCK_DENIED:		The requested lock conflicted with existing
+ *				lock reservations for the file.
+ *   %LCK_DENIED_NOLOCKS:	The server could not allocate the resources
+ *				needed to process the request.
+ *   %LCK_BLOCKED:		The blocking request cannot be granted
+ *				immediately. The server will send an
+ *				NLM_GRANTED callback to the client when
+ *				the lock can be granted.
+ *   %LCK_DENIED_GRACE_PERIOD:	The server has recently restarted and is
+ *				re-establishing existing locks, and is not
+ *				yet ready to accept normal service requests.
+ */
+static __be32
+nlmsvc_proc_lock(struct svc_rqst *rqstp)
+{
+	return nlmsvc_do_lock(rqstp, true);
+}
+
+/**
+ * nlmsvc_proc_cancel - CANCEL: Cancel an outstanding blocked lock request
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *
+ * RPC synopsis:
+ *   nlm_res NLM_CANCEL(nlm_cancargs) = 3;
+ *
+ * Permissible procedure status codes:
+ *   %LCK_GRANTED:		The requested lock was canceled.
+ *   %LCK_DENIED:		There was no lock to cancel.
+ *   %LCK_DENIED_GRACE_PERIOD:	The server has recently restarted and is
+ *				re-establishing existing locks, and is not
+ *				yet ready to accept normal service requests.
+ *
+ * The Linux NLM server implementation also returns:
+ *   %LCK_DENIED_NOLOCKS:	A needed resource could not be allocated.
+ */
+static __be32
+nlmsvc_proc_cancel(struct svc_rqst *rqstp)
+{
+	struct nlm_cancargs_wrapper *argp = rqstp->rq_argp;
+	unsigned char type = argp->xdrgen.exclusive ? F_WRLCK : F_RDLCK;
+	struct nlm_res_wrapper *resp = rqstp->rq_resp;
+	struct net *net = SVC_NET(rqstp);
+	struct nlm_host	*host = NULL;
+	struct nlm_file	*file = NULL;
+
+	resp->xdrgen.cookie = argp->xdrgen.cookie;
+
+	resp->xdrgen.stat.stat = nlm_lck_denied_grace_period;
+	if (locks_in_grace(net))
+		goto out;
+
+	resp->xdrgen.stat.stat = nlm_lck_denied_nolocks;
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		goto out;
+
+	resp->xdrgen.stat.stat = nlm3svc_lookup_file(rqstp, host, &argp->lock,
+						     &file, &argp->xdrgen.alock,
+						     type);
+	if (resp->xdrgen.stat.stat)
+		goto out;
+
+	resp->xdrgen.stat.stat = nlmsvc_cancel_blocked(net, file, &argp->lock);
+	nlmsvc_release_lockowner(&argp->lock);
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->xdrgen.stat.stat == nlm__int__drop_reply ?
+		rpc_drop_reply : rpc_success;
+}
+
+/**
+ * nlmsvc_proc_unlock - UNLOCK: Remove a lock
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *
+ * RPC synopsis:
+ *   nlm_res NLM_UNLOCK(nlm_unlockargs) = 4;
+ *
+ * Permissible procedure status codes:
+ *   %LCK_GRANTED:		The requested lock was released.
+ *   %LCK_DENIED_GRACE_PERIOD:	The server has recently restarted and is
+ *				re-establishing existing locks, and is not
+ *				yet ready to accept normal service requests.
+ *
+ * The Linux NLM server implementation also returns:
+ *   %LCK_DENIED_NOLOCKS:	A needed resource could not be allocated.
+ */
+static __be32
+nlmsvc_proc_unlock(struct svc_rqst *rqstp)
+{
+	struct nlm_unlockargs_wrapper *argp = rqstp->rq_argp;
+	struct nlm_res_wrapper *resp = rqstp->rq_resp;
+	struct net *net = SVC_NET(rqstp);
+	struct nlm_host	*host = NULL;
+	struct nlm_file	*file = NULL;
+
+	resp->xdrgen.cookie = argp->xdrgen.cookie;
+
+	resp->xdrgen.stat.stat = nlm_lck_denied_grace_period;
+	if (locks_in_grace(net))
+		goto out;
+
+	resp->xdrgen.stat.stat = nlm_lck_denied_nolocks;
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		goto out;
+
+	resp->xdrgen.stat.stat = nlm3svc_lookup_file(rqstp, host, &argp->lock,
+						     &file, &argp->xdrgen.alock,
+						     F_UNLCK);
+	if (resp->xdrgen.stat.stat)
+		goto out;
+
+	resp->xdrgen.stat.stat = nlmsvc_unlock(net, file, &argp->lock);
+	nlmsvc_release_lockowner(&argp->lock);
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->xdrgen.stat.stat == nlm__int__drop_reply ?
+		rpc_drop_reply : rpc_success;
+}
+
+/**
+ * nlmsvc_proc_granted - GRANTED: Blocked lock has been granted
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *
+ * RPC synopsis:
+ *   nlm_res NLM_GRANTED(nlm_testargs) = 5;
+ *
+ * Permissible procedure status codes:
+ *   %LCK_GRANTED:		The granted lock was accepted.
+ *   %LCK_DENIED:		The procedure failed, possibly due to
+ *				internal resource constraints.
+ *   %LCK_DENIED_GRACE_PERIOD:	The client host recently restarted and
+ *				its NLM is re-establishing existing locks,
+ *				so it is not yet ready to accept callbacks.
+ */
+static __be32
+nlmsvc_proc_granted(struct svc_rqst *rqstp)
+{
+	struct nlm_testargs_wrapper *argp = rqstp->rq_argp;
+	struct nlm_res_wrapper *resp = rqstp->rq_resp;
+
+	resp->xdrgen.cookie = argp->xdrgen.cookie;
+
+	resp->xdrgen.stat.stat = nlm_lock_to_lockd_lock(&argp->lock,
+							&argp->xdrgen.alock);
+	if (resp->xdrgen.stat.stat)
+		goto out;
+
+	resp->xdrgen.stat.stat = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
+
+out:
+	return rpc_success;
+}
+
+/*
+ * This is the generic lockd callback for async RPC calls
+ */
+static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
+{
+}
+
+void nlmsvc_release_call(struct nlm_rqst *call)
+{
+	if (!refcount_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, struct nlm_host *host, u32 proc,
+		__be32 (*func)(struct svc_rqst *, struct lockd_res *))
+{
+	struct nlm_rqst	*call;
+	__be32 stat;
+
+	call = nlm_alloc_call(host);
+	nlmsvc_release_host(host);
+	if (call == NULL)
+		return rpc_system_err;
+
+	stat = func(rqstp, &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 lockd_res *resp)
+{
+	struct nlm_testargs_wrapper *argp = rqstp->rq_argp;
+	unsigned char type = argp->xdrgen.exclusive ? F_WRLCK : F_RDLCK;
+	struct nlm_lockowner *owner;
+	struct nlm_file	*file = NULL;
+	struct nlm_host	*host = NULL;
+
+	resp->status = nlm_lck_denied_nolocks;
+	if (nlm_netobj_to_cookie(&resp->cookie, &argp->xdrgen.cookie))
+		goto out;
+
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		goto out;
+
+	resp->status = nlm3svc_lookup_file(rqstp, host, &argp->lock,
+					   &file, &argp->xdrgen.alock, type);
+	if (resp->status)
+		goto out;
+
+	owner = argp->lock.fl.c.flc_owner;
+	resp->status = cast_status(nlmsvc_testlock(rqstp, file, host,
+						   &argp->lock, &resp->lock));
+	nlmsvc_put_lockowner(owner);
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->status == nlm__int__drop_reply ? rpc_drop_reply : rpc_success;
+}
+
+/**
+ * nlmsvc_proc_test_msg - TEST_MSG: Check for conflicting lock
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *   %rpc_garbage_args:	The request arguments are malformed.
+ *   %rpc_system_err:		RPC execution failed.
+ *
+ * RPC synopsis:
+ *   void NLMPROC_TEST_MSG(nlm_testargs) = 6;
+ *
+ * The response to this request is delivered via the TEST_RES procedure.
+ */
+static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp)
+{
+	struct nlm_testargs_wrapper *argp = rqstp->rq_argp;
+	struct nlm_host *host;
+
+	if (argp->xdrgen.cookie.len > NLM_MAXCOOKIELEN)
+		return rpc_garbage_args;
+
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		return rpc_system_err;
+
+	return nlmsvc_callback(rqstp, host, NLMPROC_TEST_RES,
+			       __nlmsvc_proc_test_msg);
+}
+
+static __be32
+__nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct lockd_res *resp)
+{
+	struct nlm_lockargs_wrapper *argp = rqstp->rq_argp;
+	unsigned char type = argp->xdrgen.exclusive ? F_WRLCK : F_RDLCK;
+	struct nlm_file	*file = NULL;
+	struct nlm_host	*host = NULL;
+
+	resp->status = nlm_lck_denied_nolocks;
+	if (nlm_netobj_to_cookie(&resp->cookie, &argp->xdrgen.cookie))
+		goto out;
+
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, true);
+	if (!host)
+		goto out;
+
+	resp->status = nlm3svc_lookup_file(rqstp, host, &argp->lock,
+					   &file, &argp->xdrgen.alock, type);
+	if (resp->status)
+		goto out;
+
+	resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
+					       argp->xdrgen.block, &resp->cookie,
+					       argp->xdrgen.reclaim));
+	nlmsvc_release_lockowner(&argp->lock);
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->status == nlm__int__drop_reply ? rpc_drop_reply : rpc_success;
+}
+
+/**
+ * nlmsvc_proc_lock_msg - LOCK_MSG: Establish a monitored lock
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *   %rpc_garbage_args:	The request arguments are malformed.
+ *   %rpc_system_err:		RPC execution failed.
+ *
+ * RPC synopsis:
+ *   void NLMPROC_LOCK_MSG(nlm_lockargs) = 7;
+ *
+ * The response to this request is delivered via the LOCK_RES procedure.
+ */
+static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp)
+{
+	struct nlm_lockargs_wrapper *argp = rqstp->rq_argp;
+	struct nlm_host *host;
+
+	if (argp->xdrgen.cookie.len > NLM_MAXCOOKIELEN)
+		return rpc_garbage_args;
+
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		return rpc_system_err;
+
+	return nlmsvc_callback(rqstp, host, NLMPROC_LOCK_RES,
+			       __nlmsvc_proc_lock_msg);
+}
+
+static __be32
+__nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct lockd_res *resp)
+{
+	struct nlm_cancargs_wrapper *argp = rqstp->rq_argp;
+	unsigned char type = argp->xdrgen.exclusive ? F_WRLCK : F_RDLCK;
+	struct net *net = SVC_NET(rqstp);
+	struct nlm_file	*file = NULL;
+	struct nlm_host	*host = NULL;
+
+	resp->status = nlm_lck_denied_nolocks;
+	if (nlm_netobj_to_cookie(&resp->cookie, &argp->xdrgen.cookie))
+		goto out;
+
+	resp->status = nlm_lck_denied_grace_period;
+	if (locks_in_grace(net))
+		goto out;
+
+	resp->status = nlm_lck_denied_nolocks;
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		goto out;
+
+	resp->status = nlm3svc_lookup_file(rqstp, host, &argp->lock,
+					   &file, &argp->xdrgen.alock, type);
+	if (resp->status)
+		goto out;
+
+	resp->status = nlmsvc_cancel_blocked(net, file, &argp->lock);
+	nlmsvc_release_lockowner(&argp->lock);
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->status == nlm__int__drop_reply ? rpc_drop_reply : rpc_success;
+}
+
+/**
+ * nlmsvc_proc_cancel_msg - CANCEL_MSG: Cancel an outstanding lock request
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *   %rpc_garbage_args:	The request arguments are malformed.
+ *   %rpc_system_err:		RPC execution failed.
+ *
+ * RPC synopsis:
+ *   void NLMPROC_CANCEL_MSG(nlm_cancargs) = 8;
+ *
+ * The response to this request is delivered via the CANCEL_RES procedure.
+ */
+static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp)
+{
+	struct nlm_cancargs_wrapper *argp = rqstp->rq_argp;
+	struct nlm_host *host;
+
+	if (argp->xdrgen.cookie.len > NLM_MAXCOOKIELEN)
+		return rpc_garbage_args;
+
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		return rpc_system_err;
+
+	return nlmsvc_callback(rqstp, host, NLMPROC_CANCEL_RES,
+			       __nlmsvc_proc_cancel_msg);
+}
+
+static __be32
+__nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct lockd_res *resp)
+{
+	struct nlm_unlockargs_wrapper *argp = rqstp->rq_argp;
+	struct net *net = SVC_NET(rqstp);
+	struct nlm_file	*file = NULL;
+	struct nlm_host	*host = NULL;
+
+	resp->status = nlm_lck_denied_nolocks;
+	if (nlm_netobj_to_cookie(&resp->cookie, &argp->xdrgen.cookie))
+		goto out;
+
+	resp->status = nlm_lck_denied_grace_period;
+	if (locks_in_grace(net))
+		goto out;
+
+	resp->status = nlm_lck_denied_nolocks;
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		goto out;
+
+	resp->status = nlm3svc_lookup_file(rqstp, host, &argp->lock,
+					   &file, &argp->xdrgen.alock, F_UNLCK);
+	if (resp->status)
+		goto out;
+
+	resp->status = nlmsvc_unlock(net, file, &argp->lock);
+	nlmsvc_release_lockowner(&argp->lock);
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->status == nlm__int__drop_reply ? rpc_drop_reply : rpc_success;
+}
+
+/**
+ * nlmsvc_proc_unlock_msg - UNLOCK_MSG: Remove an existing lock
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *   %rpc_garbage_args:	The request arguments are malformed.
+ *   %rpc_system_err:		RPC execution failed.
+ *
+ * RPC synopsis:
+ *   void NLMPROC_UNLOCK_MSG(nlm_unlockargs) = 9;
+ *
+ * The response to this request is delivered via the UNLOCK_RES procedure.
+ */
+static __be32 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp)
+{
+	struct nlm_unlockargs_wrapper *argp = rqstp->rq_argp;
+	struct nlm_host *host;
+
+	if (argp->xdrgen.cookie.len > NLM_MAXCOOKIELEN)
+		return rpc_garbage_args;
+
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.alock.caller_name, false);
+	if (!host)
+		return rpc_system_err;
+
+	return nlmsvc_callback(rqstp, host, NLMPROC_UNLOCK_RES,
+			       __nlmsvc_proc_unlock_msg);
+}
+
+static __be32
+__nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct lockd_res *resp)
+{
+	struct nlm_testargs_wrapper *argp = rqstp->rq_argp;
+
+	resp->status = nlm_lck_denied;
+	if (nlm_netobj_to_cookie(&resp->cookie, &argp->xdrgen.cookie))
+		goto out;
+
+	if (nlm_lock_to_lockd_lock(&argp->lock, &argp->xdrgen.alock))
+		goto out;
+
+	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
+
+out:
+	return rpc_success;
+}
+
+/**
+ * nlmsvc_proc_granted_msg - GRANTED_MSG: Blocked lock has been granted
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_garbage_args:	The request arguments are malformed.
+ *   %rpc_system_err:		RPC execution failed.
+ *
+ * RPC synopsis:
+ *   void NLMPROC_GRANTED_MSG(nlm_testargs) = 10;
+ *
+ * The response to this request is delivered via the GRANTED_RES procedure.
+ */
+static __be32 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
+{
+	struct nlm_testargs_wrapper *argp = rqstp->rq_argp;
+	struct nlm_host *host;
+
+	if (argp->xdrgen.cookie.len > NLM_MAXCOOKIELEN)
+		return rpc_garbage_args;
+
+	host = nlmsvc_lookup_host(rqstp, argp->xdrgen.alock.caller_name.data,
+				  argp->xdrgen.alock.caller_name.len);
+	if (!host)
+		return rpc_system_err;
+
+	return nlmsvc_callback(rqstp, host, NLMPROC_GRANTED_RES,
+			       __nlmsvc_proc_granted_msg);
+}
+
+/**
+ * nlmsvc_proc_granted_res - GRANTED_RES: Lock Granted result
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *
+ * RPC synopsis:
+ *   void NLMPROC_GRANTED_RES(nlm_res) = 15;
+ */
+static __be32 nlmsvc_proc_granted_res(struct svc_rqst *rqstp)
+{
+	struct nlm_res_wrapper *argp = rqstp->rq_argp;
+
+	if (!rcu_access_pointer(nlmsvc_ops))
+		return rpc_success;
+
+	if (nlm_netobj_to_cookie(&argp->cookie, &argp->xdrgen.cookie))
+		return rpc_success;
+	nlmsvc_grant_reply(&argp->cookie, argp->xdrgen.stat.stat);
+
+	return rpc_success;
+}
+
+/**
+ * nlmsvc_proc_sm_notify - SM_NOTIFY: Peer has rebooted
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_system_err:		RPC execution failed.
+ *
+ * The SM_NOTIFY procedure is a private callback from Linux statd and is
+ * not part of the official NLM protocol.
+ *
+ * RPC synopsis:
+ *   void NLM_SM_NOTIFY(nlm_notifyargs) = 16;
+ */
+static __be32 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp)
+{
+	struct nlm_notifyargs_wrapper *argp = rqstp->rq_argp;
+	struct lockd_reboot *reboot = &argp->reboot;
+
+	if (!nlm_privileged_requester(rqstp)) {
+		char buf[RPC_MAX_ADDRBUFLEN];
+
+		pr_warn("lockd: rejected NSM callback from %s\n",
+			svc_print_addr(rqstp, buf, sizeof(buf)));
+		return rpc_system_err;
+	}
+
+	reboot->len = argp->xdrgen.notify.name.len;
+	reboot->mon = (char *)argp->xdrgen.notify.name.data;
+	reboot->state = argp->xdrgen.notify.state;
+	memcpy(&reboot->priv.data, argp->xdrgen.private,
+	       sizeof(reboot->priv.data));
+
+	nlm_host_rebooted(SVC_NET(rqstp), reboot);
+
+	return rpc_success;
+}
+
+/**
+ * nlmsvc_proc_unused - stub for unused procedures
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_proc_unavail:	Program can't support procedure.
+ */
+static __be32 nlmsvc_proc_unused(struct svc_rqst *rqstp)
+{
+	return rpc_proc_unavail;
+}
+
+/**
+ * nlmsvc_proc_share - SHARE: Open a file using DOS file-sharing modes
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *
+ * RPC synopsis:
+ *   nlm_shareres NLM_SHARE(nlm_shareargs) = 20;
+ *
+ * Permissible procedure status codes:
+ *   %LCK_GRANTED:		The requested share lock was granted.
+ *   %LCK_DENIED:		The requested lock conflicted with existing
+ *				lock reservations for the file.
+ *   %LCK_DENIED_GRACE_PERIOD:	The server has recently restarted and is
+ *				re-establishing existing locks, and is not
+ *				yet ready to accept normal service requests.
+ *
+ * The Linux NLM server implementation also returns:
+ *   %LCK_DENIED_NOLOCKS:	A needed resource could not be allocated.
+ */
+static __be32 nlmsvc_proc_share(struct svc_rqst *rqstp)
+{
+	struct nlm_shareargs_wrapper *argp = rqstp->rq_argp;
+	struct nlm_shareres_wrapper *resp = rqstp->rq_resp;
+	struct lockd_lock *lock = &argp->lock;
+	struct nlm_host	*host = NULL;
+	struct nlm_file	*file = NULL;
+	struct nlm_lock xdr_lock = {
+		.fh		= argp->xdrgen.share.fh,
+		.oh		= argp->xdrgen.share.oh,
+		.uppid		= LOCKD_SHARE_SVID,
+	};
+
+	resp->xdrgen.cookie = argp->xdrgen.cookie;
+
+	resp->xdrgen.stat = nlm_lck_denied_grace_period;
+	if (locks_in_grace(SVC_NET(rqstp)) && !argp->xdrgen.reclaim)
+		goto out;
+
+	resp->xdrgen.stat = nlm_lck_denied_nolocks;
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.share.caller_name, false);
+	if (!host)
+		goto out;
+
+	resp->xdrgen.stat = nlm3svc_lookup_file(rqstp, host, lock, &file,
+						&xdr_lock, F_RDLCK);
+	if (resp->xdrgen.stat)
+		goto out;
+
+	resp->xdrgen.stat = nlmsvc_share_file(host, file, &lock->oh,
+					      argp->xdrgen.share.access,
+					      argp->xdrgen.share.mode);
+
+	nlmsvc_release_lockowner(lock);
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->xdrgen.stat == nlm__int__drop_reply ?
+		rpc_drop_reply : rpc_success;
+}
+
+/**
+ * nlmsvc_proc_unshare - UNSHARE: Release a share reservation
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *
+ * RPC synopsis:
+ *   nlm_shareres NLM_UNSHARE(nlm_shareargs) = 21;
+ *
+ * Permissible procedure status codes:
+ *   %LCK_GRANTED:		The share reservation was released.
+ *   %LCK_DENIED_GRACE_PERIOD:	The server has recently restarted and is
+ *				re-establishing existing locks, and is not
+ *				yet ready to accept normal service requests.
+ *
+ * The Linux NLM server implementation also returns:
+ *   %LCK_DENIED_NOLOCKS:	A needed resource could not be allocated.
+ */
+static __be32 nlmsvc_proc_unshare(struct svc_rqst *rqstp)
+{
+	struct nlm_shareargs_wrapper *argp = rqstp->rq_argp;
+	struct nlm_shareres_wrapper *resp = rqstp->rq_resp;
+	struct lockd_lock *lock = &argp->lock;
+	struct nlm_lock xdr_lock = {
+		.fh		= argp->xdrgen.share.fh,
+		.oh		= argp->xdrgen.share.oh,
+		.uppid		= LOCKD_SHARE_SVID,
+	};
+	struct nlm_host	*host = NULL;
+	struct nlm_file	*file = NULL;
+
+	resp->xdrgen.cookie = argp->xdrgen.cookie;
+
+	resp->xdrgen.stat = nlm_lck_denied_grace_period;
+	if (locks_in_grace(SVC_NET(rqstp)))
+		goto out;
+
+	resp->xdrgen.stat = nlm_lck_denied_nolocks;
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.share.caller_name, false);
+	if (!host)
+		goto out;
+
+	resp->xdrgen.stat = nlm3svc_lookup_file(rqstp, host, lock, &file,
+						&xdr_lock, F_RDLCK);
+	if (resp->xdrgen.stat)
+		goto out;
+
+	resp->xdrgen.stat = nlmsvc_unshare_file(host, file, &lock->oh,
+						argp->xdrgen.share.access,
+						argp->xdrgen.share.mode);
+
+	nlmsvc_release_lockowner(lock);
+
+out:
+	if (file)
+		nlm_release_file(file);
+	nlmsvc_release_host(host);
+	return resp->xdrgen.stat == nlm__int__drop_reply ?
+		rpc_drop_reply : rpc_success;
+}
+
+/**
+ * nlmsvc_proc_nm_lock - NM_LOCK: Establish a non-monitored lock
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *   %rpc_drop_reply:		Do not send an RPC reply.
+ *
+ * RPC synopsis:
+ *   nlm_res NLM_NM_LOCK(nlm_lockargs) = 22;
+ *
+ * Permissible procedure status codes:
+ *   %LCK_GRANTED:		The requested lock was granted.
+ *   %LCK_DENIED:		The requested lock conflicted with existing
+ *				lock reservations for the file.
+ *   %LCK_DENIED_NOLOCKS:	The server could not allocate the resources
+ *				needed to process the request.
+ *   %LCK_BLOCKED:		The blocking request cannot be granted
+ *				immediately. The server will send an
+ *				NLM_GRANTED callback to the client when
+ *				the lock can be granted.
+ *   %LCK_DENIED_GRACE_PERIOD:	The server has recently restarted and is
+ *				re-establishing existing locks, and is not
+ *				yet ready to accept normal service requests.
+ */
+static __be32 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp)
+{
+	return nlmsvc_do_lock(rqstp, false);
+}
+
+/**
+ * nlmsvc_proc_free_all - FREE_ALL: Discard client's lock and share state
+ * @rqstp: RPC transaction context
+ *
+ * Returns:
+ *   %rpc_success:		RPC executed successfully.
+ *
+ * RPC synopsis:
+ *   void NLMPROC_FREE_ALL(nlm_notify) = 23;
+ */
+static __be32 nlmsvc_proc_free_all(struct svc_rqst *rqstp)
+{
+	struct nlm_notify_wrapper *argp = rqstp->rq_argp;
+	struct nlm_host	*host;
+
+	host = nlm3svc_lookup_host(rqstp, argp->xdrgen.name, false);
+	if (!host)
+		goto out;
+
+	nlmsvc_free_host_resources(host);
+
+	nlmsvc_release_host(host);
+
+out:
+	return rpc_success;
+}
+
+/*
+ * NLMv3 Server procedures.
+ */
+
+static const struct svc_procedure nlmsvc_procedures[24] = {
+	[NLM_NULL] = {
+		.pc_func	= nlmsvc_proc_null,
+		.pc_decode	= xdrgen_svc_decode_void,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= XDR_void,
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "NULL",
+	},
+	[NLM_TEST] = {
+		.pc_func	= nlmsvc_proc_test,
+		.pc_decode	= nlm_svc_decode_nlm_testargs,
+		.pc_encode	= nlm_svc_encode_nlm_testres,
+		.pc_argsize	= sizeof(struct nlm_testargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= sizeof(struct nlm_testres_wrapper),
+		.pc_xdrressize	= NLM3_nlm_testres_sz,
+		.pc_name	= "TEST",
+	},
+	[NLM_LOCK] = {
+		.pc_func	= nlmsvc_proc_lock,
+		.pc_decode	= nlm_svc_decode_nlm_lockargs,
+		.pc_encode	= nlm_svc_encode_nlm_res,
+		.pc_argsize	= sizeof(struct nlm_lockargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= sizeof(struct nlm_res_wrapper),
+		.pc_xdrressize	= NLM3_nlm_res_sz,
+		.pc_name	= "LOCK",
+	},
+	[NLM_CANCEL] = {
+		.pc_func	= nlmsvc_proc_cancel,
+		.pc_decode	= nlm_svc_decode_nlm_cancargs,
+		.pc_encode	= nlm_svc_encode_nlm_res,
+		.pc_argsize	= sizeof(struct nlm_cancargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= sizeof(struct nlm_res_wrapper),
+		.pc_xdrressize	= NLM3_nlm_res_sz,
+		.pc_name	= "CANCEL",
+	},
+	[NLM_UNLOCK] = {
+		.pc_func	= nlmsvc_proc_unlock,
+		.pc_decode	= nlm_svc_decode_nlm_unlockargs,
+		.pc_encode	= nlm_svc_encode_nlm_res,
+		.pc_argsize	= sizeof(struct nlm_unlockargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= sizeof(struct nlm_res_wrapper),
+		.pc_xdrressize	= NLM3_nlm_res_sz,
+		.pc_name	= "UNLOCK",
+	},
+	[NLM_GRANTED] = {
+		.pc_func	= nlmsvc_proc_granted,
+		.pc_decode	= nlm_svc_decode_nlm_testargs,
+		.pc_encode	= nlm_svc_encode_nlm_res,
+		.pc_argsize	= sizeof(struct nlm_testargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= sizeof(struct nlm_res_wrapper),
+		.pc_xdrressize	= NLM3_nlm_res_sz,
+		.pc_name	= "GRANTED",
+	},
+	[NLM_TEST_MSG] = {
+		.pc_func	= nlmsvc_proc_test_msg,
+		.pc_decode	= nlm_svc_decode_nlm_testargs,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_testargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "TEST_MSG",
+	},
+	[NLM_LOCK_MSG] = {
+		.pc_func	= nlmsvc_proc_lock_msg,
+		.pc_decode	= nlm_svc_decode_nlm_lockargs,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_lockargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "LOCK_MSG",
+	},
+	[NLM_CANCEL_MSG] = {
+		.pc_func	= nlmsvc_proc_cancel_msg,
+		.pc_decode	= nlm_svc_decode_nlm_cancargs,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_cancargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "CANCEL_MSG",
+	},
+	[NLM_UNLOCK_MSG] = {
+		.pc_func	= nlmsvc_proc_unlock_msg,
+		.pc_decode	= nlm_svc_decode_nlm_unlockargs,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_unlockargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "UNLOCK_MSG",
+	},
+	[NLM_GRANTED_MSG] = {
+		.pc_func	= nlmsvc_proc_granted_msg,
+		.pc_decode	= nlm_svc_decode_nlm_testargs,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_testargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "GRANTED_MSG",
+	},
+	[NLM_TEST_RES] = {
+		.pc_func	= nlmsvc_proc_null,
+		.pc_decode	= nlm_svc_decode_nlm_testres,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_testres),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "TEST_RES",
+	},
+	[NLM_LOCK_RES] = {
+		.pc_func	= nlmsvc_proc_null,
+		.pc_decode	= nlm_svc_decode_nlm_res,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_res),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "LOCK_RES",
+	},
+	[NLM_CANCEL_RES] = {
+		.pc_func	= nlmsvc_proc_null,
+		.pc_decode	= nlm_svc_decode_nlm_res,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_res),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "CANCEL_RES",
+	},
+	[NLM_UNLOCK_RES] = {
+		.pc_func	= nlmsvc_proc_null,
+		.pc_decode	= nlm_svc_decode_nlm_res,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_res),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "UNLOCK_RES",
+	},
+	[NLM_GRANTED_RES] = {
+		.pc_func	= nlmsvc_proc_granted_res,
+		.pc_decode	= nlm_svc_decode_nlm_res,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_res_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "GRANTED_RES",
+	},
+	[NLM_SM_NOTIFY] = {
+		.pc_func	= nlmsvc_proc_sm_notify,
+		.pc_decode	= nlm_svc_decode_nlm_notifyargs,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_notifyargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "SM_NOTIFY",
+	},
+	[17] = {
+		.pc_func	= nlmsvc_proc_unused,
+		.pc_decode	= xdrgen_svc_decode_void,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= 0,
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "UNUSED",
+	},
+	[18] = {
+		.pc_func	= nlmsvc_proc_unused,
+		.pc_decode	= xdrgen_svc_decode_void,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= 0,
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "UNUSED",
+	},
+	[19] = {
+		.pc_func	= nlmsvc_proc_unused,
+		.pc_decode	= xdrgen_svc_decode_void,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= 0,
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "UNUSED",
+	},
+	[NLM_SHARE] = {
+		.pc_func	= nlmsvc_proc_share,
+		.pc_decode	= nlm_svc_decode_nlm_shareargs,
+		.pc_encode	= nlm_svc_encode_nlm_shareres,
+		.pc_argsize	= sizeof(struct nlm_shareargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= sizeof(struct nlm_shareres_wrapper),
+		.pc_xdrressize	= NLM3_nlm_shareres_sz,
+		.pc_name	= "SHARE",
+	},
+	[NLM_UNSHARE] = {
+		.pc_func	= nlmsvc_proc_unshare,
+		.pc_decode	= nlm_svc_decode_nlm_shareargs,
+		.pc_encode	= nlm_svc_encode_nlm_shareres,
+		.pc_argsize	= sizeof(struct nlm_shareargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= sizeof(struct nlm_shareres_wrapper),
+		.pc_xdrressize	= NLM3_nlm_shareres_sz,
+		.pc_name	= "UNSHARE",
+	},
+	[NLM_NM_LOCK] = {
+		.pc_func	= nlmsvc_proc_nm_lock,
+		.pc_decode	= nlm_svc_decode_nlm_lockargs,
+		.pc_encode	= nlm_svc_encode_nlm_res,
+		.pc_argsize	= sizeof(struct nlm_lockargs_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= sizeof(struct nlm_res_wrapper),
+		.pc_xdrressize	= NLM3_nlm_res_sz,
+		.pc_name	= "NM_LOCK",
+	},
+	[NLM_FREE_ALL] = {
+		.pc_func	= nlmsvc_proc_free_all,
+		.pc_decode	= nlm_svc_decode_nlm_notify,
+		.pc_encode	= xdrgen_svc_encode_void,
+		.pc_argsize	= sizeof(struct nlm_notify_wrapper),
+		.pc_argzero	= 0,
+		.pc_ressize	= 0,
+		.pc_xdrressize	= XDR_void,
+		.pc_name	= "FREE_ALL",
+	},
+};
+
+/*
+ * Storage requirements for XDR arguments and results
+ */
+union nlmsvc_xdrstore {
+	struct nlm_testargs_wrapper	testargs;
+	struct nlm_lockargs_wrapper	lockargs;
+	struct nlm_cancargs_wrapper	cancargs;
+	struct nlm_unlockargs_wrapper	unlockargs;
+	struct nlm_notifyargs_wrapper	notifyargs;
+	struct nlm_shareargs_wrapper	shareargs;
+	struct nlm_notify_wrapper	notify;
+	struct nlm_testres_wrapper	testres;
+	struct nlm_res_wrapper		res;
+	struct nlm_shareres_wrapper	shareres;
+};
+
+/*
+ * NLMv1 defines only procedures 1 - 15. Linux lockd also implements
+ * procedures 0 (NULL) and 16 (SM_NOTIFY).
+ */
+const struct svc_version nlmsvc_version1 = {
+	.vs_vers	= 1,
+	.vs_nproc	= 17,
+	.vs_proc	= nlmsvc_procedures,
+	.vs_dispatch	= nlmsvc_dispatch,
+	.vs_xdrsize	= sizeof(union nlmsvc_xdrstore),
+};
+
+const struct svc_version nlmsvc_version3 = {
+	.vs_vers	= 3,
+	.vs_nproc	= ARRAY_SIZE(nlmsvc_procedures),
+	.vs_proc	= nlmsvc_procedures,
+	.vs_dispatch	= nlmsvc_dispatch,
+	.vs_xdrsize	= sizeof(union nlmsvc_xdrstore),
+};