1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2016 Tom Haynes <loghyr@primarydata.com>
4 */
5#include <linux/sunrpc/svc.h>
6#include <linux/nfs4.h>
7
8#include "nfsd.h"
9#include "flexfilelayoutxdr.h"
10
11#define NFSDDBG_FACILITY NFSDDBG_PNFS
12
13struct ff_idmap {
14 char buf[11];
15 int len;
16};
17
18__be32
19nfsd4_ff_encode_layoutget(struct xdr_stream *xdr,
20 const struct nfsd4_layoutget *lgp)
21{
22 const struct pnfs_ff_layout *fl = lgp->lg_content;
23 int len, mirror_len, ds_len, fh_len;
24 __be32 *p;
25
26 /*
27 * Unlike nfsd4_encode_user, we know these will
28 * always be stringified.
29 */
30 struct ff_idmap uid;
31 struct ff_idmap gid;
32
33 fh_len = 4 + fl->fh.size;
34
35 uid.len = sprintf(buf: uid.buf, fmt: "%u", from_kuid(to: &init_user_ns, uid: fl->uid));
36 gid.len = sprintf(buf: gid.buf, fmt: "%u", from_kgid(to: &init_user_ns, gid: fl->gid));
37
38 /* 8 + len for recording the length, name, and padding */
39 ds_len = 20 + sizeof(stateid_opaque_t) + 4 + fh_len +
40 8 + uid.len + 8 + gid.len;
41
42 mirror_len = 4 + ds_len;
43
44 /* The layout segment */
45 len = 20 + mirror_len;
46
47 p = xdr_reserve_space(xdr, nbytes: sizeof(__be32) + len);
48 if (!p)
49 return nfserr_toosmall;
50
51 *p++ = cpu_to_be32(len);
52 p = xdr_encode_hyper(p, val: 0); /* stripe unit of 1 */
53
54 *p++ = cpu_to_be32(1); /* single mirror */
55 *p++ = cpu_to_be32(1); /* single data server */
56
57 p = svcxdr_encode_deviceid4(p, devid: &fl->deviceid);
58
59 *p++ = cpu_to_be32(1); /* efficiency */
60
61 *p++ = cpu_to_be32(fl->stateid.si_generation);
62 p = xdr_encode_opaque_fixed(p, ptr: &fl->stateid.si_opaque,
63 len: sizeof(stateid_opaque_t));
64
65 *p++ = cpu_to_be32(1); /* single file handle */
66 p = xdr_encode_opaque(p, ptr: fl->fh.data, len: fl->fh.size);
67
68 p = xdr_encode_opaque(p, ptr: uid.buf, len: uid.len);
69 p = xdr_encode_opaque(p, ptr: gid.buf, len: gid.len);
70
71 *p++ = cpu_to_be32(fl->flags);
72 *p++ = cpu_to_be32(0); /* No stats collect hint */
73
74 return 0;
75}
76
77__be32
78nfsd4_ff_encode_getdeviceinfo(struct xdr_stream *xdr,
79 const struct nfsd4_getdeviceinfo *gdp)
80{
81 struct pnfs_ff_device_addr *da = gdp->gd_device;
82 int len;
83 int ver_len;
84 int addr_len;
85 __be32 *p;
86
87 /*
88 * See paragraph 5 of RFC 8881 S18.40.3.
89 */
90 if (!gdp->gd_maxcount) {
91 if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
92 return nfserr_resource;
93 return nfs_ok;
94 }
95
96 /* len + padding for two strings */
97 addr_len = 16 + da->netaddr.netid_len + da->netaddr.addr_len;
98 ver_len = 20;
99
100 len = 4 + ver_len + 4 + addr_len;
101
102 p = xdr_reserve_space(xdr, nbytes: len + sizeof(__be32));
103 if (!p)
104 return nfserr_resource;
105
106 /*
107 * Fill in the overall length and number of volumes at the beginning
108 * of the layout.
109 */
110 *p++ = cpu_to_be32(len);
111 *p++ = cpu_to_be32(1); /* 1 netaddr */
112 p = xdr_encode_opaque(p, ptr: da->netaddr.netid, len: da->netaddr.netid_len);
113 p = xdr_encode_opaque(p, ptr: da->netaddr.addr, len: da->netaddr.addr_len);
114
115 *p++ = cpu_to_be32(1); /* 1 versions */
116
117 *p++ = cpu_to_be32(da->version);
118 *p++ = cpu_to_be32(da->minor_version);
119 *p++ = cpu_to_be32(da->rsize);
120 *p++ = cpu_to_be32(da->wsize);
121 *p++ = cpu_to_be32(da->tightly_coupled);
122
123 return 0;
124}
125

source code of linux/fs/nfsd/flexfilelayoutxdr.c