lockd.c

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/*
 * 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 <[email protected]>
 */

#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 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;
}