[linux-block.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,
		int mode)
{
	__be32		nfserr;
	int		access;
	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(&fh.fh_handle.fh_raw, f->data, f->size);
	fh.fh_export = NULL;

	access = (mode == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ;
	access |= NFSD_MAY_LOCK;
	nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, 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
7f024fcd BF	28	nlm_fopen(struct svc_rqst rqstp, struct nfs_fh f, struct file **filp,
7f024fcd BF	29	int mode)
1da177e4	30	{
c7afef1f	31	__be32 nfserr;
7f024fcd	32	int access;
1da177e4 LT	33	struct svc_fh fh;
	34
	35	/* must initialize before using! but maxsize doesn't matter */
	36	fh_init(&fh,0);
	37	fh.fh_handle.fh_size = f->size;
d8b26071	38	memcpy(&fh.fh_handle.fh_raw, f->data, f->size);
1da177e4 LT	39	fh.fh_export = NULL;
1da177e4 LT	40
7f024fcd BF	41	access = (mode == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ;
	42	access \|= NFSD_MAY_LOCK;
	43	nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, filp);
1da177e4	44	fh_put(&fh);
d343fce1 N	45	/* We return nlm error codes as nlm doesn't know
d343fce1 N	46	* about nfsd, but nfsd does know about nlm..
1da177e4 LT	47	*/
	48	switch (nfserr) {
	49	case nfs_ok:
	50	return 0;
d343fce1 N	51	case nfserr_dropit:
d343fce1 N	52	return nlm_drop_reply;
1da177e4	53	case nfserr_stale:
cc77b152	54	return nlm_stale_fh;
1da177e4	55	default:
cc77b152	56	return nlm_failed;
1da177e4 LT	57	}
	58	}
	59
	60	static void
	61	nlm_fclose(struct file *filp)
	62	{
	63	fput(filp);
	64	}
	65
2a297450	66	static const struct nlmsvc_binding nfsd_nlm_ops = {
1da177e4 LT	67	.fopen = nlm_fopen, /* open file for locking */
	68	.fclose = nlm_fclose, /* close file */
	69	};
	70
	71	void
	72	nfsd_lockd_init(void)
	73	{
	74	dprintk("nfsd: initializing lockd\n");
	75	nlmsvc_ops = &nfsd_nlm_ops;
	76	}
	77
	78	void
	79	nfsd_lockd_shutdown(void)
	80	{
	81	nlmsvc_ops = NULL;
	82	}