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
nlm_fopen(struct svc_rqst * rqstp,struct nfs_fh * f,struct file ** filp)28 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
29 {
30 __be32 nfserr;
31 struct svc_fh fh;
32
33 /* must initialize before using! but maxsize doesn't matter */
34 fh_init(&fh,0);
35 fh.fh_handle.fh_size = f->size;
36 memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
37 fh.fh_export = NULL;
38
39 nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
40 fh_put(&fh);
41 /* We return nlm error codes as nlm doesn't know
42 * about nfsd, but nfsd does know about nlm..
43 */
44 switch (nfserr) {
45 case nfs_ok:
46 return 0;
47 case nfserr_dropit:
48 return nlm_drop_reply;
49 case nfserr_stale:
50 return nlm_stale_fh;
51 default:
52 return nlm_failed;
53 }
54 }
55
56 static void
nlm_fclose(struct file * filp)57 nlm_fclose(struct file *filp)
58 {
59 fput(filp);
60 }
61
62 static const struct nlmsvc_binding nfsd_nlm_ops = {
63 .fopen = nlm_fopen, /* open file for locking */
64 .fclose = nlm_fclose, /* close file */
65 };
66
67 void
nfsd_lockd_init(void)68 nfsd_lockd_init(void)
69 {
70 dprintk("nfsd: initializing lockd\n");
71 nlmsvc_ops = &nfsd_nlm_ops;
72 }
73
74 void
nfsd_lockd_shutdown(void)75 nfsd_lockd_shutdown(void)
76 {
77 nlmsvc_ops = NULL;
78 }
79