Root/fs/nfsd/lockd.c

1/*
2 * This file contains all the stubs needed when communicating with lockd.
3 * This level of indirection is necessary so we can run nfsd+lockd without
4 * requiring the nfs client to be compiled in/loaded, and vice versa.
5 *
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7 */
8
9#include <linux/file.h>
10#include <linux/lockd/bind.h>
11#include "nfsd.h"
12#include "vfs.h"
13
14#define NFSDDBG_FACILITY NFSDDBG_LOCKD
15
16#ifdef CONFIG_LOCKD_V4
17#define nlm_stale_fh nlm4_stale_fh
18#define nlm_failed nlm4_failed
19#else
20#define nlm_stale_fh nlm_lck_denied_nolocks
21#define nlm_failed nlm_lck_denied_nolocks
22#endif
23/*
24 * Note: we hold the dentry use count while the file is open.
25 */
26static __be32
27nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
28{
29    __be32 nfserr;
30    struct svc_fh fh;
31
32    /* must initialize before using! but maxsize doesn't matter */
33    fh_init(&fh,0);
34    fh.fh_handle.fh_size = f->size;
35    memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
36    fh.fh_export = NULL;
37
38    exp_readlock();
39    nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
40    fh_put(&fh);
41    exp_readunlock();
42     /* We return nlm error codes as nlm doesn't know
43     * about nfsd, but nfsd does know about nlm..
44     */
45    switch (nfserr) {
46    case nfs_ok:
47        return 0;
48    case nfserr_dropit:
49        return nlm_drop_reply;
50    case nfserr_stale:
51        return nlm_stale_fh;
52    default:
53        return nlm_failed;
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}
80

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