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The nlm_fopen() function is part of the API between nfsd and lockd. Currently its return value is an on-the-wire NLM status code. But that forces NFSD to include NLM wire protocol definitions despite having no other dependency on the NLM wire protocol. In addition, a CONFIG_LOCKD_V4 Kconfig symbol appears in the middle of NFSD source code. Refactor: Let's not use on-the-wire values as part of a high-level API between two Linux kernel modules. That's what we have errno for, right? And, instead of simply moving the CONFIG_LOCKD_V4 check, we can get rid of it entirely and let the decision of what actual NLM status code goes on the wire to be left up to NLM version-specific code. Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This file contains all the stubs needed when communicating with lockd.
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* This level of indirection is necessary so we can run nfsd+lockd without
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* requiring the nfs client to be compiled in/loaded, and vice versa.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/file.h>
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#include <linux/lockd/bind.h>
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#include "nfsd.h"
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#include "vfs.h"
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#define NFSDDBG_FACILITY NFSDDBG_LOCKD
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/**
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* nlm_fopen - Open an NFSD file
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* @rqstp: NLM RPC procedure execution context
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* @f: NFS file handle to be opened
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* @filp: OUT: an opened struct file
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* @flags: the POSIX open flags to use
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*
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* nlm_fopen() holds the dentry reference until nlm_fclose() releases it.
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*
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* Returns zero on success or a negative errno value if the file
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* cannot be opened.
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*/
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static int nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f,
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struct file **filp, int flags)
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{
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__be32 nfserr;
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int access;
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struct svc_fh fh;
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/* must initialize before using! but maxsize doesn't matter */
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fh_init(&fh,0);
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fh.fh_handle.fh_size = f->size;
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memcpy(&fh.fh_handle.fh_raw, f->data, f->size);
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fh.fh_export = NULL;
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/*
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* Allow BYPASS_GSS as some client implementations use AUTH_SYS
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* for NLM even when GSS is used for NFS.
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* Allow OWNER_OVERRIDE as permission might have been changed
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* after the file was opened.
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* Pass MAY_NLM so that authentication can be completely bypassed
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* if NFSEXP_NOAUTHNLM is set. Some older clients use AUTH_NULL
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* for NLM requests.
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*/
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access = (flags == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ;
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access |= NFSD_MAY_NLM | NFSD_MAY_OWNER_OVERRIDE | NFSD_MAY_BYPASS_GSS;
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nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, filp);
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fh_put(&fh);
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switch (nfserr) {
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case nfs_ok:
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break;
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case nfserr_jukebox:
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/*
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* This error can indicate a presence of a conflicting
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* delegation to an NLM lock request. Options are:
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* (1) For now, drop this request and make the client
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* retry. When delegation is returned, client's lock retry
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* will complete.
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* (2) NLM4_DENIED as per "spec" signals to the client
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* that the lock is unavailable now but client can retry.
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* Linux client implementation does not. It treats
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* NLM4_DENIED same as NLM4_FAILED and fails the request.
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* (3) For the future, treat this as blocked lock and try
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* to callback when the delegation is returned but might
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* not have a proper lock request to block on.
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*/
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return -EWOULDBLOCK;
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case nfserr_stale:
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return -ESTALE;
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default:
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return -ENOLCK;
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}
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return 0;
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}
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/**
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* nlm_fclose - Close an NFSD file
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* @filp: a struct file that was opened by nlm_fopen()
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*/
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static void
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nlm_fclose(struct file *filp)
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{
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fput(filp);
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}
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static const struct nlmsvc_binding nfsd_nlm_ops = {
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.fopen = nlm_fopen, /* open file for locking */
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.fclose = nlm_fclose, /* close file */
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};
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void
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nfsd_lockd_init(void)
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{
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dprintk("nfsd: initializing lockd\n");
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nlmsvc_ops = &nfsd_nlm_ops;
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}
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void
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nfsd_lockd_shutdown(void)
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{
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nlmsvc_ops = NULL;
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}
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