blob: 7b889ff15ae63a96ef47be64172c7d360ef2d61a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/fs.h>
13#include <linux/file.h>
14#include <linux/mount.h>
15#include <linux/sunrpc/clnt.h>
16#include <linux/sunrpc/svc.h>
17#include <linux/nfsd/nfsd.h>
18#include <linux/lockd/bind.h>
19
20#define NFSDDBG_FACILITY NFSDDBG_LOCKD
21
22/*
23 * Note: we hold the dentry use count while the file is open.
24 */
25static u32
26nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
27{
28 u32 nfserr;
29 struct svc_fh fh;
30
31 /* must initialize before using! but maxsize doesn't matter */
32 fh_init(&fh,0);
33 fh.fh_handle.fh_size = f->size;
34 memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
35 fh.fh_export = NULL;
36
37 exp_readlock();
38 nfserr = nfsd_open(rqstp, &fh, S_IFREG, MAY_LOCK, filp);
39 fh_put(&fh);
40 rqstp->rq_client = NULL;
41 exp_readunlock();
42 /* nlm and nfsd don't share error codes.
43 * we invent: 0 = no error
44 * 1 = stale file handle
45 * 2 = other error
46 */
47 switch (nfserr) {
48 case nfs_ok:
49 return 0;
50 case nfserr_stale:
51 return 1;
52 default:
53 return 2;
54 }
55}
56
57static void
58nlm_fclose(struct file *filp)
59{
60 fput(filp);
61}
62
63static struct nlmsvc_binding nfsd_nlm_ops = {
64 .fopen = nlm_fopen, /* open file for locking */
65 .fclose = nlm_fclose, /* close file */
66};
67
68void
69nfsd_lockd_init(void)
70{
71 dprintk("nfsd: initializing lockd\n");
72 nlmsvc_ops = &nfsd_nlm_ops;
73}
74
75void
76nfsd_lockd_shutdown(void)
77{
78 nlmsvc_ops = NULL;
79}