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(uid.buf, "%u", from_kuid(&init_user_ns, fl->uid));
36	gid.len = sprintf(gid.buf, "%u", from_kgid(&init_user_ns, 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, sizeof(__be32) + len);
48	if (!p)
49		return nfserr_toosmall;
50
51	*p++ = cpu_to_be32(len);
52	p = xdr_encode_hyper(p, 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 = xdr_encode_opaque_fixed(p, &fl->deviceid,
58			sizeof(struct nfsd4_deviceid));
59
60	*p++ = cpu_to_be32(1);			/* efficiency */
61
62	*p++ = cpu_to_be32(fl->stateid.si_generation);
63	p = xdr_encode_opaque_fixed(p, &fl->stateid.si_opaque,
64				    sizeof(stateid_opaque_t));
65
66	*p++ = cpu_to_be32(1);			/* single file handle */
67	p = xdr_encode_opaque(p, fl->fh.data, fl->fh.size);
68
69	p = xdr_encode_opaque(p, uid.buf, uid.len);
70	p = xdr_encode_opaque(p, gid.buf, gid.len);
71
72	*p++ = cpu_to_be32(fl->flags);
73	*p++ = cpu_to_be32(0);			/* No stats collect hint */
74
75	return 0;
76}
77
78__be32
79nfsd4_ff_encode_getdeviceinfo(struct xdr_stream *xdr,
80		const struct nfsd4_getdeviceinfo *gdp)
81{
82	struct pnfs_ff_device_addr *da = gdp->gd_device;
83	int len;
84	int ver_len;
85	int addr_len;
86	__be32 *p;
87
88	/*
89	 * See paragraph 5 of RFC 8881 S18.40.3.
90	 */
91	if (!gdp->gd_maxcount) {
92		if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
93			return nfserr_resource;
94		return nfs_ok;
95	}
96
97	/* len + padding for two strings */
98	addr_len = 16 + da->netaddr.netid_len + da->netaddr.addr_len;
99	ver_len = 20;
100
101	len = 4 + ver_len + 4 + addr_len;
102
103	p = xdr_reserve_space(xdr, len + sizeof(__be32));
104	if (!p)
105		return nfserr_resource;
106
107	/*
108	 * Fill in the overall length and number of volumes at the beginning
109	 * of the layout.
110	 */
111	*p++ = cpu_to_be32(len);
112	*p++ = cpu_to_be32(1);			/* 1 netaddr */
113	p = xdr_encode_opaque(p, da->netaddr.netid, da->netaddr.netid_len);
114	p = xdr_encode_opaque(p, da->netaddr.addr, da->netaddr.addr_len);
115
116	*p++ = cpu_to_be32(1);			/* 1 versions */
117
118	*p++ = cpu_to_be32(da->version);
119	*p++ = cpu_to_be32(da->minor_version);
120	*p++ = cpu_to_be32(da->rsize);
121	*p++ = cpu_to_be32(da->wsize);
122	*p++ = cpu_to_be32(da->tightly_coupled);
123
124	return 0;
125}
126