1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * This file contains all the stubs needed when communicating with lockd.
4 * This level of indirection is necessary so we can run nfsd+lockd without
5 * requiring the nfs client to be compiled in/loaded, and vice versa.
6 *
7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
8 */
9
10 #include <linux/file.h>
11 #include <linux/lockd/bind.h>
12 #include "nfsd.h"
13 #include "vfs.h"
14
15 #define NFSDDBG_FACILITY NFSDDBG_LOCKD
16
17 #ifdef CONFIG_LOCKD_V4
18 #define nlm_stale_fh nlm4_stale_fh
19 #define nlm_failed nlm4_failed
20 #else
21 #define nlm_stale_fh nlm_lck_denied_nolocks
22 #define nlm_failed nlm_lck_denied_nolocks
23 #endif
24 /*
25 * Note: we hold the dentry use count while the file is open.
26 */
27 static __be32
28 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp,
29 int mode)
30 {
31 __be32 nfserr;
32 int access;
33 struct svc_fh fh;
34
35 /* must initialize before using! but maxsize doesn't matter */
36 fh_init(&fh,0);
37 fh.fh_handle.fh_size = f->size;
38 memcpy(&fh.fh_handle.fh_raw, f->data, f->size);
39 fh.fh_export = NULL;
40
41 access = (mode == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ;
42 access |= NFSD_MAY_LOCK;
43 nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, filp);
44 fh_put(&fh);
45 /* We return nlm error codes as nlm doesn't know
46 * about nfsd, but nfsd does know about nlm..
47 */
48 switch (nfserr) {
49 case nfs_ok:
50 return 0;
51 case nfserr_dropit:
52 return nlm_drop_reply;
53 case nfserr_stale:
54 return nlm_stale_fh;
55 default:
56 return nlm_failed;
57 }
58 }
59
60 static void
61 nlm_fclose(struct file *filp)
62 {
63 fput(filp);
64 }
65
66 static const struct nlmsvc_binding nfsd_nlm_ops = {
67 .fopen = nlm_fopen, /* open file for locking */
68 .fclose = nlm_fclose, /* close file */
69 };
70
71 void
72 nfsd_lockd_init(void)
73 {
74 dprintk("nfsd: initializing lockd\n");
75 nlmsvc_ops = &nfsd_nlm_ops;
76 }
77
78 void
79 nfsd_lockd_shutdown(void)
80 {
81 nlmsvc_ops = NULL;
82 }
83
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.