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
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 + 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
79 nfsd4_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
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