root/fs/nfsd/lockd.c

DEFINITIONS

1. nlm_fopen
2. nlm_fclose
3. nfsd_lockd_init
4. nfsd_lockd_shutdown

/*
 * 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

#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;

        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;
        case nfserr_stale:
                return nlm_stale_fh;
        default:
                return nlm_failed;
        }
}

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 */
};

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

void
nfsd_lockd_shutdown(void)
{
        nlmsvc_ops = NULL;
}