1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
// 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,
};
|
