lockd.c
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:2k
- /*
- * 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 lockdn");
- nlmsvc_ops = &nfsd_nlm_ops;
- }
- void
- nfsd_lockd_shutdown(void)
- {
- nlmsvc_ops = NULL;
- }