xref: /openbmc/linux/fs/nfsd/lockd.c (revision 7bcae826)
1  /*
2   * This file contains all the stubs needed when communicating with lockd.
3   * This level of indirection is necessary so we can run nfsd+lockd without
4   * requiring the nfs client to be compiled in/loaded, and vice versa.
5   *
6   * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7   */
8  
9  #include <linux/file.h>
10  #include <linux/lockd/bind.h>
11  #include "nfsd.h"
12  #include "vfs.h"
13  
14  #define NFSDDBG_FACILITY		NFSDDBG_LOCKD
15  
16  #ifdef CONFIG_LOCKD_V4
17  #define nlm_stale_fh	nlm4_stale_fh
18  #define nlm_failed	nlm4_failed
19  #else
20  #define nlm_stale_fh	nlm_lck_denied_nolocks
21  #define nlm_failed	nlm_lck_denied_nolocks
22  #endif
23  /*
24   * Note: we hold the dentry use count while the file is open.
25   */
26  static __be32
27  nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
28  {
29  	__be32		nfserr;
30  	struct svc_fh	fh;
31  
32  	/* must initialize before using! but maxsize doesn't matter */
33  	fh_init(&fh,0);
34  	fh.fh_handle.fh_size = f->size;
35  	memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
36  	fh.fh_export = NULL;
37  
38  	nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
39  	fh_put(&fh);
40   	/* We return nlm error codes as nlm doesn't know
41  	 * about nfsd, but nfsd does know about nlm..
42  	 */
43  	switch (nfserr) {
44  	case nfs_ok:
45  		return 0;
46  	case nfserr_dropit:
47  		return nlm_drop_reply;
48  	case nfserr_stale:
49  		return nlm_stale_fh;
50  	default:
51  		return nlm_failed;
52  	}
53  }
54  
55  static void
56  nlm_fclose(struct file *filp)
57  {
58  	fput(filp);
59  }
60  
61  static const struct nlmsvc_binding nfsd_nlm_ops = {
62  	.fopen		= nlm_fopen,		/* open file for locking */
63  	.fclose		= nlm_fclose,		/* close file */
64  };
65  
66  void
67  nfsd_lockd_init(void)
68  {
69  	dprintk("nfsd: initializing lockd\n");
70  	nlmsvc_ops = &nfsd_nlm_ops;
71  }
72  
73  void
74  nfsd_lockd_shutdown(void)
75  {
76  	nlmsvc_ops = NULL;
77  }
78