blob: 46a7f9b813e527707f305ab85ee8e97e8564edec [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/lockd/bind.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020012#include "nfsd.h"
J. Bruce Fields0a3adad2009-11-04 18:12:35 -050013#include "vfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15#define NFSDDBG_FACILITY NFSDDBG_LOCKD
16
Miklos Szeredicc77b152008-07-25 01:48:55 -070017#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070024/*
25 * Note: we hold the dentry use count while the file is open.
26 */
Al Viroe8c5c042006-12-13 00:35:03 -080027static __be32
J. Bruce Fields7f024fc2021-08-23 16:44:00 -040028nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp,
29 int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
Al Viroc7afef12006-10-19 23:29:02 -070031 __be32 nfserr;
J. Bruce Fields7f024fc2021-08-23 16:44:00 -040032 int access;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 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;
NeilBrownd8b26072021-09-02 11:16:32 +100038 memcpy(&fh.fh_handle.fh_raw, f->data, f->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 fh.fh_export = NULL;
40
J. Bruce Fields7f024fc2021-08-23 16:44:00 -040041 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 fh_put(&fh);
NeilBrownd343fce2006-10-17 00:10:18 -070045 /* We return nlm error codes as nlm doesn't know
46 * about nfsd, but nfsd does know about nlm..
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 */
48 switch (nfserr) {
49 case nfs_ok:
50 return 0;
NeilBrownd343fce2006-10-17 00:10:18 -070051 case nfserr_dropit:
52 return nlm_drop_reply;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 case nfserr_stale:
Miklos Szeredicc77b152008-07-25 01:48:55 -070054 return nlm_stale_fh;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 default:
Miklos Szeredicc77b152008-07-25 01:48:55 -070056 return nlm_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 }
58}
59
60static void
61nlm_fclose(struct file *filp)
62{
63 fput(filp);
64}
65
Julia Lawall2a297452015-12-23 22:25:13 +010066static const struct nlmsvc_binding nfsd_nlm_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 .fopen = nlm_fopen, /* open file for locking */
68 .fclose = nlm_fclose, /* close file */
Linus Torvalds1da177e2005-04-16 15:20:36 -070069};
70
71void
72nfsd_lockd_init(void)
73{
74 dprintk("nfsd: initializing lockd\n");
75 nlmsvc_ops = &nfsd_nlm_ops;
76}
77
78void
79nfsd_lockd_shutdown(void)
80{
81 nlmsvc_ops = NULL;
82}