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
13 struct ff_idmap {
14 char buf[11];
15 int len;
16 };
17
18 __be32
nfsd4_ff_encode_layoutget(struct xdr_stream * xdr,const struct nfsd4_layoutget * lgp)19 nfsd4_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 + xdr_align_size(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 /* data server entry: deviceid + efficiency + stateid + fh list +
39 * user + group + flags + stats_collect_hint
40 */
41 ds_len = 16 + 4 + 4 + sizeof(stateid_opaque_t) + 4 + fh_len +
42 4 + xdr_align_size(uid.len) +
43 4 + xdr_align_size(gid.len) +
44 4 + 4;
45
46 /* mirror: ds_count + ds */
47 mirror_len = 4 + ds_len;
48
49 /* stripe_unit + mirror_count + mirror */
50 len = 12 + mirror_len;
51
52 p = xdr_reserve_space(xdr, sizeof(__be32) + len);
53 if (!p)
54 return nfserr_toosmall;
55
56 *p++ = cpu_to_be32(len);
57 p = xdr_encode_hyper(p, 0); /* stripe unit of 1 */
58
59 *p++ = cpu_to_be32(1); /* single mirror */
60 *p++ = cpu_to_be32(1); /* single data server */
61
62 p = svcxdr_encode_deviceid4(p, &fl->deviceid);
63
64 *p++ = cpu_to_be32(1); /* efficiency */
65
66 *p++ = cpu_to_be32(fl->stateid.si_generation);
67 p = xdr_encode_opaque_fixed(p, &fl->stateid.si_opaque,
68 sizeof(stateid_opaque_t));
69
70 *p++ = cpu_to_be32(1); /* single file handle */
71 p = xdr_encode_opaque(p, fl->fh.data, fl->fh.size);
72
73 p = xdr_encode_opaque(p, uid.buf, uid.len);
74 p = xdr_encode_opaque(p, gid.buf, gid.len);
75
76 *p++ = cpu_to_be32(fl->flags);
77 *p++ = cpu_to_be32(0); /* No stats collect hint */
78
79 return 0;
80 }
81
82 __be32
nfsd4_ff_encode_getdeviceinfo(struct xdr_stream * xdr,const struct nfsd4_getdeviceinfo * gdp)83 nfsd4_ff_encode_getdeviceinfo(struct xdr_stream *xdr,
84 const struct nfsd4_getdeviceinfo *gdp)
85 {
86 struct pnfs_ff_device_addr *da = gdp->gd_device;
87 int len;
88 int ver_len;
89 int addr_len;
90 __be32 *p;
91
92 /*
93 * See paragraph 5 of RFC 8881 S18.40.3.
94 */
95 if (!gdp->gd_maxcount) {
96 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
97 return nfserr_resource;
98 return nfs_ok;
99 }
100
101 /* len + padding for two strings */
102 addr_len = 8 + xdr_align_size(da->netaddr.netid_len) +
103 xdr_align_size(da->netaddr.addr_len);
104 ver_len = 20;
105
106 len = 4 + ver_len + 4 + addr_len;
107
108 p = xdr_reserve_space(xdr, len + sizeof(__be32));
109 if (!p)
110 return nfserr_resource;
111
112 /*
113 * Fill in the overall length and number of volumes at the beginning
114 * of the layout.
115 */
116 *p++ = cpu_to_be32(len);
117 *p++ = cpu_to_be32(1); /* 1 netaddr */
118 p = xdr_encode_opaque(p, da->netaddr.netid, da->netaddr.netid_len);
119 p = xdr_encode_opaque(p, da->netaddr.addr, da->netaddr.addr_len);
120
121 *p++ = cpu_to_be32(1); /* 1 versions */
122
123 *p++ = cpu_to_be32(da->version);
124 *p++ = cpu_to_be32(da->minor_version);
125 *p++ = cpu_to_be32(da->rsize);
126 *p++ = cpu_to_be32(da->wsize);
127 *p++ = cpu_to_be32(da->tightly_coupled);
128
129 return 0;
130 }
131