1/*
2 * linux/fs/nfsd/lockd.c
3 *
4 * This file contains all the stubs needed when communicating with lockd.
5 * This level of indirection is necessary so we can run nfsd+lockd without
6 * requiring the nfs client to be compiled in/loaded, and vice versa.
7 *
8 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
9 */
10
11#include <linux/types.h>
12#include <linux/sunrpc/clnt.h>
13#include <linux/sunrpc/svc.h>
14#include <linux/nfsd/nfsd.h>
15#include <linux/lockd/bind.h>
16
17#define NFSDDBG_FACILITY		NFSDDBG_LOCKD
18
19/*
20 * Note: we hold the dentry use count while the file is open.
21 */
22static u32
23nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file *filp)
24{
25	u32		nfserr;
26	struct svc_fh	fh;
27
28	/* must initialize before using! but maxsize doesn't matter */
29	fh_init(&fh,0);
30	fh.fh_handle.fh_size = f->size;
31	memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
32	fh.fh_export = NULL;
33
34	nfserr = nfsd_open(rqstp, &fh, S_IFREG, MAY_LOCK, filp);
35	if (!nfserr) {
36		dget(filp->f_dentry);
37		mntget(filp->f_vfsmnt);
38	}
39	fh_put(&fh);
40 	/* nlm and nfsd don't share error codes.
41	 * we invent: 0 = no error
42	 *            1 = stale file handle
43	 *	      2 = other error
44	 */
45	switch (nfserr) {
46	case nfs_ok:
47		return 0;
48	case nfserr_stale:
49		return 1;
50	default:
51		return 2;
52	}
53}
54
55static void
56nlm_fclose(struct file *filp)
57{
58	nfsd_close(filp);
59	dput(filp->f_dentry);
60	mntput(filp->f_vfsmnt);
61}
62
63struct nlmsvc_binding		nfsd_nlm_ops = {
64	exp_readlock,		/* lock export table for reading */
65	exp_unlock,		/* unlock export table */
66	exp_getclient,		/* look up NFS client */
67	nlm_fopen,		/* open file for locking */
68	nlm_fclose,		/* close file */
69	exp_nlmdetach,		/* lockd shutdown notification */
70};
71
72void
73nfsd_lockd_unexport(struct svc_client *clnt)
74{
75	nlmsvc_invalidate_client(clnt);
76}
77
78void
79nfsd_lockd_init(void)
80{
81	dprintk("nfsd: initializing lockd\n");
82	nlmsvc_ops = &nfsd_nlm_ops;
83}
84
85void
86nfsd_lockd_shutdown(void)
87{
88	nlmsvc_ops = NULL;
89}
90