[mirror_ubuntu-bionic-kernel.git] / fs / nfsd / lockd.c

// SPDX-License-Identifier: GPL-2.0
/*
 * This file contains all the stubs needed when communicating with lockd.
 * This level of indirection is necessary so we can run nfsd+lockd without
 * requiring the nfs client to be compiled in/loaded, and vice versa.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/file.h>
#include <linux/lockd/bind.h>
#include "nfsd.h"
#include "vfs.h"

#define NFSDDBG_FACILITY		NFSDDBG_LOCKD

#ifdef CONFIG_LOCKD_V4
#define nlm_stale_fh	nlm4_stale_fh
#define nlm_failed	nlm4_failed
#else
#define nlm_stale_fh	nlm_lck_denied_nolocks
#define nlm_failed	nlm_lck_denied_nolocks
#endif
/*
 * Note: we hold the dentry use count while the file is open.
 */
static __be32
nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
{
	__be32		nfserr;
	struct svc_fh	fh;

	/* must initialize before using! but maxsize doesn't matter */
	fh_init(&fh,0);
	fh.fh_handle.fh_size = f->size;
	memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
	fh.fh_export = NULL;

	nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
	fh_put(&fh);
 	/* We return nlm error codes as nlm doesn't know
	 * about nfsd, but nfsd does know about nlm..
	 */
	switch (nfserr) {
	case nfs_ok:
		return 0;
	case nfserr_dropit:
		return nlm_drop_reply;
	case nfserr_stale:
		return nlm_stale_fh;
	default:
		return nlm_failed;
	}
}

static void
nlm_fclose(struct file *filp)
{
	fput(filp);
}

static const struct nlmsvc_binding nfsd_nlm_ops = {
	.fopen		= nlm_fopen,		/* open file for locking */
	.fclose		= nlm_fclose,		/* close file */
};

void
nfsd_lockd_init(void)
{
	dprintk("nfsd: initializing lockd\n");
	nlmsvc_ops = &nfsd_nlm_ops;
}

void
nfsd_lockd_shutdown(void)
{
	nlmsvc_ops = NULL;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
1da177e4 LT	3	* 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
1da177e4	10	#include <linux/file.h>
1da177e4	11	#include <linux/lockd/bind.h>
9a74af21	12	#include "nfsd.h"
0a3adade	13	#include "vfs.h"
1da177e4 LT	14
	15	#define NFSDDBG_FACILITY NFSDDBG_LOCKD
	16
cc77b152 MS	17	#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
1da177e4 LT	24	/*
	25	* Note: we hold the dentry use count while the file is open.
	26	*/
e8c5c045	27	static __be32
1da177e4 LT	28	nlm_fopen(struct svc_rqst rqstp, struct nfs_fh f, struct file **filp)
1da177e4 LT	29	{
c7afef1f	30	__be32 nfserr;
1da177e4 LT	31	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
8837abca	39	nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
1da177e4	40	fh_put(&fh);
d343fce1 N	41	/* We return nlm error codes as nlm doesn't know
d343fce1 N	42	* about nfsd, but nfsd does know about nlm..
1da177e4 LT	43	*/
	44	switch (nfserr) {
	45	case nfs_ok:
	46	return 0;
d343fce1 N	47	case nfserr_dropit:
d343fce1 N	48	return nlm_drop_reply;
1da177e4	49	case nfserr_stale:
cc77b152	50	return nlm_stale_fh;
1da177e4	51	default:
cc77b152	52	return nlm_failed;
1da177e4 LT	53	}
	54	}
	55
	56	static void
	57	nlm_fclose(struct file *filp)
	58	{
	59	fput(filp);
	60	}
	61
2a297450	62	static const struct nlmsvc_binding nfsd_nlm_ops = {
1da177e4 LT	63	.fopen = nlm_fopen, /* open file for locking */
	64	.fclose = nlm_fclose, /* close file */
	65	};
	66
	67	void
	68	nfsd_lockd_init(void)
	69	{
	70	dprintk("nfsd: initializing lockd\n");
	71	nlmsvc_ops = &nfsd_nlm_ops;
	72	}
	73
	74	void
	75	nfsd_lockd_shutdown(void)
	76	{
	77	nlmsvc_ops = NULL;
	78	}