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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070028nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
29{
Al Viroc7afef12006-10-19 23:29:02 -070030 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 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
Miklos Szeredi8837abc2008-06-16 13:20:29 +020039 nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 fh_put(&fh);
NeilBrownd343fce2006-10-17 00:10:18 -070041 /* We return nlm error codes as nlm doesn't know
42 * about nfsd, but nfsd does know about nlm..
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 */
44 switch (nfserr) {
45 case nfs_ok:
46 return 0;
NeilBrownd343fce2006-10-17 00:10:18 -070047 case nfserr_dropit:
48 return nlm_drop_reply;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 case nfserr_stale:
Miklos Szeredicc77b152008-07-25 01:48:55 -070050 return nlm_stale_fh;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 default:
Miklos Szeredicc77b152008-07-25 01:48:55 -070052 return nlm_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 }
54}
55
56static void
57nlm_fclose(struct file *filp)
58{
59 fput(filp);
60}
61
Julia Lawall2a297452015-12-23 22:25:13 +010062static const struct nlmsvc_binding nfsd_nlm_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 .fopen = nlm_fopen, /* open file for locking */
64 .fclose = nlm_fclose, /* close file */
Linus Torvalds1da177e2005-04-16 15:20:36 -070065};
66
67void
68nfsd_lockd_init(void)
69{
70 dprintk("nfsd: initializing lockd\n");
71 nlmsvc_ops = &nfsd_nlm_ops;
72}
73
74void
75nfsd_lockd_shutdown(void)
76{
77 nlmsvc_ops = NULL;
78}