[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / nfsd / lockd.c

/*
 * linux/fs/nfsd/lockd.c
 *
 * 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/types.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/lockd/bind.h>

#define NFSDDBG_FACILITY		NFSDDBG_LOCKD

/*
 * 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;

	exp_readlock();
	nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
	fh_put(&fh);
	rqstp->rq_client = NULL;
	exp_readunlock();
 	/* 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;
#ifdef CONFIG_LOCKD_V4
	case nfserr_stale:
		return nlm4_stale_fh;
#endif
	default:
		return nlm_lck_denied;
	}
}

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

static struct nlmsvc_binding	nfsd_nlm_ops = {
	.fopen		= nlm_fopen,		/* open file for locking */
	.fclose		= nlm_fclose,		/* close file */
	.get_grace_period = get_nfs4_grace_period,
};

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
1da177e4 LT	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	*/
e8c5c045	25	static __be32
1da177e4 LT	26	nlm_fopen(struct svc_rqst rqstp, struct nfs_fh f, struct file **filp)
1da177e4 LT	27	{
c7afef1f	28	__be32 nfserr;
1da177e4 LT	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();
8837abca	38	nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
1da177e4 LT	39	fh_put(&fh);
	40	rqstp->rq_client = NULL;
	41	exp_readunlock();
d343fce1 N	42	/* We return nlm error codes as nlm doesn't know
d343fce1 N	43	* about nfsd, but nfsd does know about nlm..
1da177e4 LT	44	*/
	45	switch (nfserr) {
	46	case nfs_ok:
	47	return 0;
d343fce1 N	48	case nfserr_dropit:
	49	return nlm_drop_reply;
	50	#ifdef CONFIG_LOCKD_V4
1da177e4	51	case nfserr_stale:
d343fce1 N	52	return nlm4_stale_fh;
d343fce1 N	53	#endif
1da177e4	54	default:
d343fce1	55	return nlm_lck_denied;
1da177e4 LT	56	}
	57	}
	58
	59	static void
	60	nlm_fclose(struct file *filp)
	61	{
	62	fput(filp);
	63	}
	64
	65	static struct nlmsvc_binding nfsd_nlm_ops = {
	66	.fopen = nlm_fopen, /* open file for locking */
	67	.fclose = nlm_fclose, /* close file */
9a8db97e	68	.get_grace_period = get_nfs4_grace_period,
1da177e4 LT	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	}