xref: /openbmc/linux/fs/nfsd/lockd.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 /*
2  * linux/fs/nfsd/lockd.c
3  *
4  * This file contains all the stubs needed when communicating with lockd.
5  * This level of indirection is necessary so we can run nfsd+lockd without
6  * requiring the nfs client to be compiled in/loaded, and vice versa.
7  *
8  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
9  */
10 
11 #include <linux/types.h>
12 #include <linux/fs.h>
13 #include <linux/file.h>
14 #include <linux/mount.h>
15 #include <linux/sunrpc/clnt.h>
16 #include <linux/sunrpc/svc.h>
17 #include <linux/nfsd/nfsd.h>
18 #include <linux/lockd/bind.h>
19 
20 #define NFSDDBG_FACILITY		NFSDDBG_LOCKD
21 
22 /*
23  * Note: we hold the dentry use count while the file is open.
24  */
25 static u32
26 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
27 {
28 	u32		nfserr;
29 	struct svc_fh	fh;
30 
31 	/* must initialize before using! but maxsize doesn't matter */
32 	fh_init(&fh,0);
33 	fh.fh_handle.fh_size = f->size;
34 	memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
35 	fh.fh_export = NULL;
36 
37 	exp_readlock();
38 	nfserr = nfsd_open(rqstp, &fh, S_IFREG, MAY_LOCK, filp);
39 	fh_put(&fh);
40 	rqstp->rq_client = NULL;
41 	exp_readunlock();
42  	/* nlm and nfsd don't share error codes.
43 	 * we invent: 0 = no error
44 	 *            1 = stale file handle
45 	 *	      2 = other error
46 	 */
47 	switch (nfserr) {
48 	case nfs_ok:
49 		return 0;
50 	case nfserr_stale:
51 		return 1;
52 	default:
53 		return 2;
54 	}
55 }
56 
57 static void
58 nlm_fclose(struct file *filp)
59 {
60 	fput(filp);
61 }
62 
63 static struct nlmsvc_binding	nfsd_nlm_ops = {
64 	.fopen		= nlm_fopen,		/* open file for locking */
65 	.fclose		= nlm_fclose,		/* close file */
66 };
67 
68 void
69 nfsd_lockd_init(void)
70 {
71 	dprintk("nfsd: initializing lockd\n");
72 	nlmsvc_ops = &nfsd_nlm_ops;
73 }
74 
75 void
76 nfsd_lockd_shutdown(void)
77 {
78 	nlmsvc_ops = NULL;
79 }
80