1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2014-2016 Christoph Hellwig.
4 */
5 #include <linux/sunrpc/svc.h>
6 #include <linux/exportfs.h>
7 #include <linux/iomap.h>
8 #include <linux/nfs4.h>
9
10 #include "nfsd.h"
11 #include "blocklayoutxdr.h"
12
13 #define NFSDDBG_FACILITY NFSDDBG_PNFS
14
15
16 __be32
nfsd4_block_encode_layoutget(struct xdr_stream * xdr,struct nfsd4_layoutget * lgp)17 nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
18 struct nfsd4_layoutget *lgp)
19 {
20 struct pnfs_block_extent *b = lgp->lg_content;
21 int len = sizeof(__be32) + 5 * sizeof(__be64) + sizeof(__be32);
22 __be32 *p;
23
24 p = xdr_reserve_space(xdr, sizeof(__be32) + len);
25 if (!p)
26 return nfserr_toosmall;
27
28 *p++ = cpu_to_be32(len);
29 *p++ = cpu_to_be32(1); /* we always return a single extent */
30
31 p = xdr_encode_opaque_fixed(p, &b->vol_id,
32 sizeof(struct nfsd4_deviceid));
33 p = xdr_encode_hyper(p, b->foff);
34 p = xdr_encode_hyper(p, b->len);
35 p = xdr_encode_hyper(p, b->soff);
36 *p++ = cpu_to_be32(b->es);
37 return 0;
38 }
39
40 static int
nfsd4_block_encode_volume(struct xdr_stream * xdr,struct pnfs_block_volume * b)41 nfsd4_block_encode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
42 {
43 __be32 *p;
44 int len;
45
46 switch (b->type) {
47 case PNFS_BLOCK_VOLUME_SIMPLE:
48 len = 4 + 4 + 8 + 4 + (XDR_QUADLEN(b->simple.sig_len) << 2);
49 p = xdr_reserve_space(xdr, len);
50 if (!p)
51 return -ETOOSMALL;
52
53 *p++ = cpu_to_be32(b->type);
54 *p++ = cpu_to_be32(1); /* single signature */
55 p = xdr_encode_hyper(p, b->simple.offset);
56 p = xdr_encode_opaque(p, b->simple.sig, b->simple.sig_len);
57 break;
58 case PNFS_BLOCK_VOLUME_SCSI:
59 len = 4 + 4 + 4 + 4 + (XDR_QUADLEN(b->scsi.designator_len) << 2) + 8;
60 p = xdr_reserve_space(xdr, len);
61 if (!p)
62 return -ETOOSMALL;
63
64 *p++ = cpu_to_be32(b->type);
65 *p++ = cpu_to_be32(b->scsi.code_set);
66 *p++ = cpu_to_be32(b->scsi.designator_type);
67 p = xdr_encode_opaque(p, b->scsi.designator, b->scsi.designator_len);
68 p = xdr_encode_hyper(p, b->scsi.pr_key);
69 break;
70 default:
71 return -ENOTSUPP;
72 }
73
74 return len;
75 }
76
77 __be32
nfsd4_block_encode_getdeviceinfo(struct xdr_stream * xdr,struct nfsd4_getdeviceinfo * gdp)78 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
79 struct nfsd4_getdeviceinfo *gdp)
80 {
81 struct pnfs_block_deviceaddr *dev = gdp->gd_device;
82 int len = sizeof(__be32), ret, i;
83 __be32 *p;
84
85 /*
86 * See paragraph 5 of RFC 8881 S18.40.3.
87 */
88 if (!gdp->gd_maxcount) {
89 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
90 return nfserr_resource;
91 return nfs_ok;
92 }
93
94 p = xdr_reserve_space(xdr, len + sizeof(__be32));
95 if (!p)
96 return nfserr_resource;
97
98 for (i = 0; i < dev->nr_volumes; i++) {
99 ret = nfsd4_block_encode_volume(xdr, &dev->volumes[i]);
100 if (ret < 0)
101 return nfserrno(ret);
102 len += ret;
103 }
104
105 /*
106 * Fill in the overall length and number of volumes at the beginning
107 * of the layout.
108 */
109 *p++ = cpu_to_be32(len);
110 *p++ = cpu_to_be32(dev->nr_volumes);
111 return 0;
112 }
113
114 int
nfsd4_block_decode_layoutupdate(__be32 * p,u32 len,struct iomap ** iomapp,u32 block_size)115 nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
116 u32 block_size)
117 {
118 struct iomap *iomaps;
119 u32 nr_iomaps, i;
120
121 if (len < sizeof(u32)) {
122 dprintk("%s: extent array too small: %u\n", __func__, len);
123 return -EINVAL;
124 }
125 len -= sizeof(u32);
126 if (len % PNFS_BLOCK_EXTENT_SIZE) {
127 dprintk("%s: extent array invalid: %u\n", __func__, len);
128 return -EINVAL;
129 }
130
131 nr_iomaps = be32_to_cpup(p++);
132 if (nr_iomaps != len / PNFS_BLOCK_EXTENT_SIZE) {
133 dprintk("%s: extent array size mismatch: %u/%u\n",
134 __func__, len, nr_iomaps);
135 return -EINVAL;
136 }
137
138 iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
139 if (!iomaps) {
140 dprintk("%s: failed to allocate extent array\n", __func__);
141 return -ENOMEM;
142 }
143
144 for (i = 0; i < nr_iomaps; i++) {
145 struct pnfs_block_extent bex;
146
147 memcpy(&bex.vol_id, p, sizeof(struct nfsd4_deviceid));
148 p += XDR_QUADLEN(sizeof(struct nfsd4_deviceid));
149
150 p = xdr_decode_hyper(p, &bex.foff);
151 if (bex.foff & (block_size - 1)) {
152 dprintk("%s: unaligned offset 0x%llx\n",
153 __func__, bex.foff);
154 goto fail;
155 }
156 p = xdr_decode_hyper(p, &bex.len);
157 if (bex.len & (block_size - 1)) {
158 dprintk("%s: unaligned length 0x%llx\n",
159 __func__, bex.foff);
160 goto fail;
161 }
162 p = xdr_decode_hyper(p, &bex.soff);
163 if (bex.soff & (block_size - 1)) {
164 dprintk("%s: unaligned disk offset 0x%llx\n",
165 __func__, bex.soff);
166 goto fail;
167 }
168 bex.es = be32_to_cpup(p++);
169 if (bex.es != PNFS_BLOCK_READWRITE_DATA) {
170 dprintk("%s: incorrect extent state %d\n",
171 __func__, bex.es);
172 goto fail;
173 }
174
175 iomaps[i].offset = bex.foff;
176 iomaps[i].length = bex.len;
177 }
178
179 *iomapp = iomaps;
180 return nr_iomaps;
181 fail:
182 kfree(iomaps);
183 return -EINVAL;
184 }
185
186 int
nfsd4_scsi_decode_layoutupdate(__be32 * p,u32 len,struct iomap ** iomapp,u32 block_size)187 nfsd4_scsi_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
188 u32 block_size)
189 {
190 struct iomap *iomaps;
191 u32 nr_iomaps, expected, i;
192
193 if (len < sizeof(u32)) {
194 dprintk("%s: extent array too small: %u\n", __func__, len);
195 return -EINVAL;
196 }
197
198 nr_iomaps = be32_to_cpup(p++);
199 expected = sizeof(__be32) + nr_iomaps * PNFS_SCSI_RANGE_SIZE;
200 if (len != expected) {
201 dprintk("%s: extent array size mismatch: %u/%u\n",
202 __func__, len, expected);
203 return -EINVAL;
204 }
205
206 iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
207 if (!iomaps) {
208 dprintk("%s: failed to allocate extent array\n", __func__);
209 return -ENOMEM;
210 }
211
212 for (i = 0; i < nr_iomaps; i++) {
213 u64 val;
214
215 p = xdr_decode_hyper(p, &val);
216 if (val & (block_size - 1)) {
217 dprintk("%s: unaligned offset 0x%llx\n", __func__, val);
218 goto fail;
219 }
220 iomaps[i].offset = val;
221
222 p = xdr_decode_hyper(p, &val);
223 if (val & (block_size - 1)) {
224 dprintk("%s: unaligned length 0x%llx\n", __func__, val);
225 goto fail;
226 }
227 iomaps[i].length = val;
228 }
229
230 *iomapp = iomaps;
231 return nr_iomaps;
232 fail:
233 kfree(iomaps);
234 return -EINVAL;
235 }
236