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 #include "vfs.h"
13
14 #define NFSDDBG_FACILITY NFSDDBG_PNFS
15
16
17 /**
18 * nfsd4_block_encode_layoutget - encode block/scsi layout extent array
19 * @xdr: stream for data encoding
20 * @lgp: layoutget content, actually an array of extents to encode
21 *
22 * Encode the opaque loc_body field in the layoutget response. Since the
23 * pnfs_block_layout4 and pnfs_scsi_layout4 structures on the wire are
24 * the same, this function is used by both layout drivers.
25 *
26 * Return values:
27 * %nfs_ok: Success, all extents encoded into @xdr
28 * %nfserr_toosmall: Not enough space in @xdr to encode all the data
29 */
30 __be32
nfsd4_block_encode_layoutget(struct xdr_stream * xdr,const struct nfsd4_layoutget * lgp)31 nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
32 const struct nfsd4_layoutget *lgp)
33 {
34 const struct pnfs_block_layout *bl = lgp->lg_content;
35 u32 i, len = sizeof(__be32) + bl->nr_extents * PNFS_BLOCK_EXTENT_SIZE;
36 __be32 *p;
37
38 p = xdr_reserve_space(xdr, sizeof(__be32) + len);
39 if (!p)
40 return nfserr_toosmall;
41
42 *p++ = cpu_to_be32(len);
43 *p++ = cpu_to_be32(bl->nr_extents);
44
45 for (i = 0; i < bl->nr_extents; i++) {
46 const struct pnfs_block_extent *bex = bl->extents + i;
47
48 p = svcxdr_encode_deviceid4(p, &bex->vol_id);
49 p = xdr_encode_hyper(p, bex->foff);
50 p = xdr_encode_hyper(p, bex->len);
51 p = xdr_encode_hyper(p, bex->soff);
52 *p++ = cpu_to_be32(bex->es);
53 }
54
55 return nfs_ok;
56 }
57
58 static int
nfsd4_block_encode_volume(struct xdr_stream * xdr,struct pnfs_block_volume * b)59 nfsd4_block_encode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
60 {
61 __be32 *p;
62 int len;
63
64 switch (b->type) {
65 case PNFS_BLOCK_VOLUME_SIMPLE:
66 len = 4 + 4 + 8 + 4 + (XDR_QUADLEN(b->simple.sig_len) << 2);
67 p = xdr_reserve_space(xdr, len);
68 if (!p)
69 return -ETOOSMALL;
70
71 *p++ = cpu_to_be32(b->type);
72 *p++ = cpu_to_be32(1); /* single signature */
73 p = xdr_encode_hyper(p, b->simple.offset);
74 p = xdr_encode_opaque(p, b->simple.sig, b->simple.sig_len);
75 break;
76 case PNFS_BLOCK_VOLUME_SCSI:
77 len = 4 + 4 + 4 + 4 + (XDR_QUADLEN(b->scsi.designator_len) << 2) + 8;
78 p = xdr_reserve_space(xdr, len);
79 if (!p)
80 return -ETOOSMALL;
81
82 *p++ = cpu_to_be32(b->type);
83 *p++ = cpu_to_be32(b->scsi.code_set);
84 *p++ = cpu_to_be32(b->scsi.designator_type);
85 p = xdr_encode_opaque(p, b->scsi.designator, b->scsi.designator_len);
86 p = xdr_encode_hyper(p, b->scsi.pr_key);
87 break;
88 default:
89 return -ENOTSUPP;
90 }
91
92 return len;
93 }
94
95 __be32
nfsd4_block_encode_getdeviceinfo(struct xdr_stream * xdr,const struct nfsd4_getdeviceinfo * gdp)96 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
97 const struct nfsd4_getdeviceinfo *gdp)
98 {
99 struct pnfs_block_deviceaddr *dev = gdp->gd_device;
100 int len = sizeof(__be32), ret, i;
101 __be32 *p;
102
103 /*
104 * See paragraph 5 of RFC 8881 S18.40.3.
105 */
106 if (!gdp->gd_maxcount) {
107 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
108 return nfserr_resource;
109 return nfs_ok;
110 }
111
112 p = xdr_reserve_space(xdr, len + sizeof(__be32));
113 if (!p)
114 return nfserr_resource;
115
116 for (i = 0; i < dev->nr_volumes; i++) {
117 ret = nfsd4_block_encode_volume(xdr, &dev->volumes[i]);
118 if (ret < 0)
119 return nfserrno(ret);
120 len += ret;
121 }
122
123 /*
124 * Fill in the overall length and number of volumes at the beginning
125 * of the layout.
126 */
127 *p++ = cpu_to_be32(len);
128 *p++ = cpu_to_be32(dev->nr_volumes);
129 return 0;
130 }
131
132 /**
133 * nfsd4_block_decode_layoutupdate - decode the block layout extent array
134 * @xdr: subbuf set to the encoded array
135 * @iomapp: pointer to store the decoded extent array
136 * @nr_iomapsp: pointer to store the number of extents
137 * @block_size: alignment of extent offset and length
138 *
139 * This function decodes the opaque field of the layoutupdate4 structure
140 * in a layoutcommit request for the block layout driver. The field is
141 * actually an array of extents sent by the client. It also checks that
142 * the file offset, storage offset and length of each extent are aligned
143 * by @block_size.
144 *
145 * Return values:
146 * %nfs_ok: Successful decoding, @iomapp and @nr_iomapsp are valid
147 * %nfserr_bad_xdr: The encoded array in @xdr is invalid
148 * %nfserr_inval: An unaligned extent found
149 * %nfserr_delay: Failed to allocate memory for @iomapp
150 */
151 __be32
nfsd4_block_decode_layoutupdate(struct xdr_stream * xdr,struct iomap ** iomapp,int * nr_iomapsp,u32 block_size)152 nfsd4_block_decode_layoutupdate(struct xdr_stream *xdr, struct iomap **iomapp,
153 int *nr_iomapsp, u32 block_size)
154 {
155 struct iomap *iomaps;
156 u32 nr_iomaps, expected, len, i;
157 __be32 nfserr;
158
159 if (xdr_stream_decode_u32(xdr, &nr_iomaps))
160 return nfserr_bad_xdr;
161
162 len = sizeof(__be32) + xdr_stream_remaining(xdr);
163 expected = sizeof(__be32) + nr_iomaps * PNFS_BLOCK_EXTENT_SIZE;
164 if (len != expected)
165 return nfserr_bad_xdr;
166
167 iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
168 if (!iomaps)
169 return nfserr_delay;
170
171 for (i = 0; i < nr_iomaps; i++) {
172 struct pnfs_block_extent bex;
173
174 if (nfsd4_decode_deviceid4(xdr, &bex.vol_id)) {
175 nfserr = nfserr_bad_xdr;
176 goto fail;
177 }
178
179 if (xdr_stream_decode_u64(xdr, &bex.foff)) {
180 nfserr = nfserr_bad_xdr;
181 goto fail;
182 }
183 if (bex.foff & (block_size - 1)) {
184 nfserr = nfserr_inval;
185 goto fail;
186 }
187
188 if (xdr_stream_decode_u64(xdr, &bex.len)) {
189 nfserr = nfserr_bad_xdr;
190 goto fail;
191 }
192 if (bex.len & (block_size - 1)) {
193 nfserr = nfserr_inval;
194 goto fail;
195 }
196
197 if (xdr_stream_decode_u64(xdr, &bex.soff)) {
198 nfserr = nfserr_bad_xdr;
199 goto fail;
200 }
201 if (bex.soff & (block_size - 1)) {
202 nfserr = nfserr_inval;
203 goto fail;
204 }
205
206 if (xdr_stream_decode_u32(xdr, &bex.es)) {
207 nfserr = nfserr_bad_xdr;
208 goto fail;
209 }
210 if (bex.es != PNFS_BLOCK_READWRITE_DATA) {
211 nfserr = nfserr_inval;
212 goto fail;
213 }
214
215 iomaps[i].offset = bex.foff;
216 iomaps[i].length = bex.len;
217 }
218
219 *iomapp = iomaps;
220 *nr_iomapsp = nr_iomaps;
221 return nfs_ok;
222 fail:
223 kfree(iomaps);
224 return nfserr;
225 }
226
227 /**
228 * nfsd4_scsi_decode_layoutupdate - decode the scsi layout extent array
229 * @xdr: subbuf set to the encoded array
230 * @iomapp: pointer to store the decoded extent array
231 * @nr_iomapsp: pointer to store the number of extents
232 * @block_size: alignment of extent offset and length
233 *
234 * This function decodes the opaque field of the layoutupdate4 structure
235 * in a layoutcommit request for the scsi layout driver. The field is
236 * actually an array of extents sent by the client. It also checks that
237 * the offset and length of each extent are aligned by @block_size.
238 *
239 * Return values:
240 * %nfs_ok: Successful decoding, @iomapp and @nr_iomapsp are valid
241 * %nfserr_bad_xdr: The encoded array in @xdr is invalid
242 * %nfserr_inval: An unaligned extent found
243 * %nfserr_delay: Failed to allocate memory for @iomapp
244 */
245 __be32
nfsd4_scsi_decode_layoutupdate(struct xdr_stream * xdr,struct iomap ** iomapp,int * nr_iomapsp,u32 block_size)246 nfsd4_scsi_decode_layoutupdate(struct xdr_stream *xdr, struct iomap **iomapp,
247 int *nr_iomapsp, u32 block_size)
248 {
249 struct iomap *iomaps;
250 u32 nr_iomaps, expected, len, i;
251 __be32 nfserr;
252
253 if (xdr_stream_decode_u32(xdr, &nr_iomaps))
254 return nfserr_bad_xdr;
255
256 len = sizeof(__be32) + xdr_stream_remaining(xdr);
257 expected = sizeof(__be32) + nr_iomaps * PNFS_SCSI_RANGE_SIZE;
258 if (len != expected)
259 return nfserr_bad_xdr;
260
261 iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
262 if (!iomaps)
263 return nfserr_delay;
264
265 for (i = 0; i < nr_iomaps; i++) {
266 u64 val;
267
268 if (xdr_stream_decode_u64(xdr, &val)) {
269 nfserr = nfserr_bad_xdr;
270 goto fail;
271 }
272 if (val & (block_size - 1)) {
273 nfserr = nfserr_inval;
274 goto fail;
275 }
276 iomaps[i].offset = val;
277
278 if (xdr_stream_decode_u64(xdr, &val)) {
279 nfserr = nfserr_bad_xdr;
280 goto fail;
281 }
282 if (val & (block_size - 1)) {
283 nfserr = nfserr_inval;
284 goto fail;
285 }
286 iomaps[i].length = val;
287 }
288
289 *iomapp = iomaps;
290 *nr_iomapsp = nr_iomaps;
291 return nfs_ok;
292 fail:
293 kfree(iomaps);
294 return nfserr;
295 }
296