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// SPDX-License-Identifier: GPL-2.0-only
/*
* NFS server support for local clients to bypass network stack
*
* Copyright (C) 2014 Weston Andros Adamson <dros@primarydata.com>
* Copyright (C) 2019 Trond Myklebust <trond.myklebust@hammerspace.com>
* Copyright (C) 2024 Mike Snitzer <snitzer@hammerspace.com>
* Copyright (C) 2024 NeilBrown <neilb@suse.de>
*/
#include <linux/exportfs.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs_common.h>
#include <linux/nfslocalio.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_xdr.h>
#include <linux/string.h>
#include "nfsd.h"
#include "vfs.h"
#include "netns.h"
#include "filecache.h"
#include "cache.h"
static const struct nfsd_localio_operations nfsd_localio_ops = {
.nfsd_serv_try_get = nfsd_serv_try_get,
.nfsd_serv_put = nfsd_serv_put,
.nfsd_open_local_fh = nfsd_open_local_fh,
.nfsd_file_put_local = nfsd_file_put_local,
.nfsd_file_file = nfsd_file_file,
};
void nfsd_localio_ops_init(void)
{
nfs_to = &nfsd_localio_ops;
}
/**
* nfsd_open_local_fh - lookup a local filehandle @nfs_fh and map to nfsd_file
*
* @net: 'struct net' to get the proper nfsd_net required for LOCALIO access
* @dom: 'struct auth_domain' required for LOCALIO access
* @rpc_clnt: rpc_clnt that the client established
* @cred: cred that the client established
* @nfs_fh: filehandle to lookup
* @fmode: fmode_t to use for open
*
* This function maps a local fh to a path on a local filesystem.
* This is useful when the nfs client has the local server mounted - it can
* avoid all the NFS overhead with reads, writes and commits.
*
* On successful return, returned nfsd_file will have its nf_net member
* set. Caller (NFS client) is responsible for calling nfsd_serv_put and
* nfsd_file_put (via nfs_to_nfsd_file_put_local).
*/
struct nfsd_file *
nfsd_open_local_fh(struct net *net, struct auth_domain *dom,
struct rpc_clnt *rpc_clnt, const struct cred *cred,
const struct nfs_fh *nfs_fh, const fmode_t fmode)
{
int mayflags = NFSD_MAY_LOCALIO;
struct svc_cred rq_cred;
struct svc_fh fh;
struct nfsd_file *localio;
__be32 beres;
if (nfs_fh->size > NFS4_FHSIZE)
return ERR_PTR(-EINVAL);
/* nfs_fh -> svc_fh */
fh_init(&fh, NFS4_FHSIZE);
fh.fh_handle.fh_size = nfs_fh->size;
memcpy(fh.fh_handle.fh_raw, nfs_fh->data, nfs_fh->size);
if (fmode & FMODE_READ)
mayflags |= NFSD_MAY_READ;
if (fmode & FMODE_WRITE)
mayflags |= NFSD_MAY_WRITE;
svcauth_map_clnt_to_svc_cred_local(rpc_clnt, cred, &rq_cred);
beres = nfsd_file_acquire_local(net, &rq_cred, dom,
&fh, mayflags, &localio);
if (beres)
localio = ERR_PTR(nfs_stat_to_errno(be32_to_cpu(beres)));
fh_put(&fh);
if (rq_cred.cr_group_info)
put_group_info(rq_cred.cr_group_info);
return localio;
}
EXPORT_SYMBOL_GPL(nfsd_open_local_fh);
/*
* UUID_IS_LOCAL XDR functions
*/
static __be32 localio_proc_null(struct svc_rqst *rqstp)
{
return rpc_success;
}
struct localio_uuidarg {
uuid_t uuid;
};
static __be32 localio_proc_uuid_is_local(struct svc_rqst *rqstp)
{
struct localio_uuidarg *argp = rqstp->rq_argp;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
nfs_uuid_is_local(&argp->uuid, &nn->local_clients,
net, rqstp->rq_client, THIS_MODULE);
return rpc_success;
}
static bool localio_decode_uuidarg(struct svc_rqst *rqstp,
struct xdr_stream *xdr)
{
struct localio_uuidarg *argp = rqstp->rq_argp;
u8 uuid[UUID_SIZE];
if (decode_opaque_fixed(xdr, uuid, UUID_SIZE))
return false;
import_uuid(&argp->uuid, uuid);
return true;
}
static const struct svc_procedure localio_procedures1[] = {
[LOCALIOPROC_NULL] = {
.pc_func = localio_proc_null,
.pc_decode = nfssvc_decode_voidarg,
.pc_encode = nfssvc_encode_voidres,
.pc_argsize = sizeof(struct nfsd_voidargs),
.pc_ressize = sizeof(struct nfsd_voidres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = 0,
.pc_name = "NULL",
},
[LOCALIOPROC_UUID_IS_LOCAL] = {
.pc_func = localio_proc_uuid_is_local,
.pc_decode = localio_decode_uuidarg,
.pc_encode = nfssvc_encode_voidres,
.pc_argsize = sizeof(struct localio_uuidarg),
.pc_argzero = sizeof(struct localio_uuidarg),
.pc_ressize = sizeof(struct nfsd_voidres),
.pc_cachetype = RC_NOCACHE,
.pc_name = "UUID_IS_LOCAL",
},
};
#define LOCALIO_NR_PROCEDURES ARRAY_SIZE(localio_procedures1)
static DEFINE_PER_CPU_ALIGNED(unsigned long,
localio_count[LOCALIO_NR_PROCEDURES]);
const struct svc_version localio_version1 = {
.vs_vers = 1,
.vs_nproc = LOCALIO_NR_PROCEDURES,
.vs_proc = localio_procedures1,
.vs_dispatch = nfsd_dispatch,
.vs_count = localio_count,
.vs_xdrsize = XDR_QUADLEN(UUID_SIZE),
.vs_hidden = true,
};
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