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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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/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#ifdef CONFIG_LOCKD_V4
23#define nlm_stale_fh nlm4_stale_fh
24#define nlm_failed nlm4_failed
25#else
26#define nlm_stale_fh nlm_lck_denied_nolocks
27#define nlm_failed nlm_lck_denied_nolocks
28#endif
29/*
30 * Note: we hold the dentry use count while the file is open.
31 */
32static __be32
33nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
34{
35 __be32 nfserr;
36 struct svc_fh fh;
37
38 /* must initialize before using! but maxsize doesn't matter */
39 fh_init(&fh,0);
40 fh.fh_handle.fh_size = f->size;
41 memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
42 fh.fh_export = NULL;
43
44 exp_readlock();
45 nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
46 fh_put(&fh);
47 rqstp->rq_client = NULL;
48 exp_readunlock();
49 /* We return nlm error codes as nlm doesn't know
50 * about nfsd, but nfsd does know about nlm..
51 */
52 switch (nfserr) {
53 case nfs_ok:
54 return 0;
55 case nfserr_dropit:
56 return nlm_drop_reply;
57 case nfserr_stale:
58 return nlm_stale_fh;
59 default:
60 return nlm_failed;
61 }
62}
63
64static void
65nlm_fclose(struct file *filp)
66{
67 fput(filp);
68}
69
70static struct nlmsvc_binding nfsd_nlm_ops = {
71 .fopen = nlm_fopen, /* open file for locking */
72 .fclose = nlm_fclose, /* close file */
73};
74
75void
76nfsd_lockd_init(void)
77{
78 dprintk("nfsd: initializing lockd\n");
79 nlmsvc_ops = &nfsd_nlm_ops;
80}
81
82void
83nfsd_lockd_shutdown(void)
84{
85 nlmsvc_ops = NULL;
86}