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/fs/nfsd/lockd.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 77 lines | 54 code | 9 blank | 14 comment | 1 complexity | caa88995298e48a0f646f8012fd8fa70 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
 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 */
26static __be32
27nlm_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
55static void
56nlm_fclose(struct file *filp)
57{
58	fput(filp);
59}
60
61static struct nlmsvc_binding	nfsd_nlm_ops = {
62	.fopen		= nlm_fopen,		/* open file for locking */
63	.fclose		= nlm_fclose,		/* close file */
64};
65
66void
67nfsd_lockd_init(void)
68{
69	dprintk("nfsd: initializing lockd\n");
70	nlmsvc_ops = &nfsd_nlm_ops;
71}
72
73void
74nfsd_lockd_shutdown(void)
75{
76	nlmsvc_ops = NULL;
77}