Viewing file:  lockd.c (2.01 KB) -rw-r--r--
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/*
* 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/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 u32
nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file *filp)
{
u32 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, MAY_LOCK, filp);
if (!nfserr) {
dget(filp->f_dentry);
mntget(filp->f_vfsmnt);
}
fh_put(&fh);
/* nlm and nfsd don't share error codes.
* we invent: 0 = no error
* 1 = stale file handle
* 2 = other error
*/
switch (nfserr) {
case nfs_ok:
return 0;
case nfserr_stale:
return 1;
default:
return 2;
}
}
static void
nlm_fclose(struct file *filp)
{
nfsd_close(filp);
dput(filp->f_dentry);
mntput(filp->f_vfsmnt);
}
struct nlmsvc_binding nfsd_nlm_ops = {
exp_readlock, /* lock export table for reading */
exp_unlock, /* unlock export table */
exp_getclient, /* look up NFS client */
nlm_fopen, /* open file for locking */
nlm_fclose, /* close file */
exp_nlmdetach, /* lockd shutdown notification */
};
/*
* When removing an NFS client entry, notify lockd that it is gone.
* FIXME: We should do the same when unexporting an NFS volume.
*/
void
nfsd_lockd_unexport(struct svc_client *clnt)
{
nlmsvc_invalidate_client(clnt);
}
void
nfsd_lockd_init(void)
{
dprintk("nfsd: initializing lockd\n");
nlmsvc_ops = &nfsd_nlm_ops;
}
void
nfsd_lockd_shutdown(void)
{
nlmsvc_ops = NULL;
}
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