1
2
3
4#include <linux/sunrpc/svc.h>
5#include <linux/blkdev.h>
6#include <linux/nfs4.h>
7#include <linux/nfs_fs.h>
8#include <linux/nfs_xdr.h>
9
10#include "blocklayout.h"
11
12#define NFSDBG_FACILITY NFSDBG_PNFS_LD
13
14static void
15bl_free_device(struct pnfs_block_dev *dev)
16{
17 if (dev->nr_children) {
18 int i;
19
20 for (i = 0; i < dev->nr_children; i++)
21 bl_free_device(&dev->children[i]);
22 kfree(dev->children);
23 } else {
24 if (dev->bdev)
25 blkdev_put(dev->bdev, FMODE_READ);
26 }
27}
28
29void
30bl_free_deviceid_node(struct nfs4_deviceid_node *d)
31{
32 struct pnfs_block_dev *dev =
33 container_of(d, struct pnfs_block_dev, node);
34
35 bl_free_device(dev);
36 kfree_rcu(dev, node.rcu);
37}
38
39static int
40nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
41{
42 __be32 *p;
43 int i;
44
45 p = xdr_inline_decode(xdr, 4);
46 if (!p)
47 return -EIO;
48 b->type = be32_to_cpup(p++);
49
50 switch (b->type) {
51 case PNFS_BLOCK_VOLUME_SIMPLE:
52 p = xdr_inline_decode(xdr, 4);
53 if (!p)
54 return -EIO;
55 b->simple.nr_sigs = be32_to_cpup(p++);
56 if (!b->simple.nr_sigs) {
57 dprintk("no signature\n");
58 return -EIO;
59 }
60
61 b->simple.len = 4 + 4;
62 for (i = 0; i < b->simple.nr_sigs; i++) {
63 p = xdr_inline_decode(xdr, 8 + 4);
64 if (!p)
65 return -EIO;
66 p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);
67 b->simple.sigs[i].sig_len = be32_to_cpup(p++);
68
69 p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);
70 if (!p)
71 return -EIO;
72 memcpy(&b->simple.sigs[i].sig, p,
73 b->simple.sigs[i].sig_len);
74
75 b->simple.len += 8 + 4 + b->simple.sigs[i].sig_len;
76 }
77 break;
78 case PNFS_BLOCK_VOLUME_SLICE:
79 p = xdr_inline_decode(xdr, 8 + 8 + 4);
80 if (!p)
81 return -EIO;
82 p = xdr_decode_hyper(p, &b->slice.start);
83 p = xdr_decode_hyper(p, &b->slice.len);
84 b->slice.volume = be32_to_cpup(p++);
85 break;
86 case PNFS_BLOCK_VOLUME_CONCAT:
87 p = xdr_inline_decode(xdr, 4);
88 if (!p)
89 return -EIO;
90 b->concat.volumes_count = be32_to_cpup(p++);
91
92 p = xdr_inline_decode(xdr, b->concat.volumes_count * 4);
93 if (!p)
94 return -EIO;
95 for (i = 0; i < b->concat.volumes_count; i++)
96 b->concat.volumes[i] = be32_to_cpup(p++);
97 break;
98 case PNFS_BLOCK_VOLUME_STRIPE:
99 p = xdr_inline_decode(xdr, 8 + 4);
100 if (!p)
101 return -EIO;
102 p = xdr_decode_hyper(p, &b->stripe.chunk_size);
103 b->stripe.volumes_count = be32_to_cpup(p++);
104
105 p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4);
106 if (!p)
107 return -EIO;
108 for (i = 0; i < b->stripe.volumes_count; i++)
109 b->stripe.volumes[i] = be32_to_cpup(p++);
110 break;
111 default:
112 dprintk("unknown volume type!\n");
113 return -EIO;
114 }
115
116 return 0;
117}
118
119static bool bl_map_simple(struct pnfs_block_dev *dev, u64 offset,
120 struct pnfs_block_dev_map *map)
121{
122 map->start = dev->start;
123 map->len = dev->len;
124 map->disk_offset = dev->disk_offset;
125 map->bdev = dev->bdev;
126 return true;
127}
128
129static bool bl_map_concat(struct pnfs_block_dev *dev, u64 offset,
130 struct pnfs_block_dev_map *map)
131{
132 int i;
133
134 for (i = 0; i < dev->nr_children; i++) {
135 struct pnfs_block_dev *child = &dev->children[i];
136
137 if (child->start > offset ||
138 child->start + child->len <= offset)
139 continue;
140
141 child->map(child, offset - child->start, map);
142 return true;
143 }
144
145 dprintk("%s: ran off loop!\n", __func__);
146 return false;
147}
148
149static bool bl_map_stripe(struct pnfs_block_dev *dev, u64 offset,
150 struct pnfs_block_dev_map *map)
151{
152 struct pnfs_block_dev *child;
153 u64 chunk;
154 u32 chunk_idx;
155 u64 disk_offset;
156
157 chunk = div_u64(offset, dev->chunk_size);
158 div_u64_rem(chunk, dev->nr_children, &chunk_idx);
159
160 if (chunk_idx > dev->nr_children) {
161 dprintk("%s: invalid chunk idx %d (%lld/%lld)\n",
162 __func__, chunk_idx, offset, dev->chunk_size);
163
164 return false;
165 }
166
167
168 offset = chunk * dev->chunk_size;
169
170
171 disk_offset = div_u64(offset, dev->nr_children);
172
173 child = &dev->children[chunk_idx];
174 child->map(child, disk_offset, map);
175
176 map->start += offset;
177 map->disk_offset += disk_offset;
178 map->len = dev->chunk_size;
179 return true;
180}
181
182static int
183bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
184 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);
185
186
187static int
188bl_parse_simple(struct nfs_server *server, struct pnfs_block_dev *d,
189 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
190{
191 struct pnfs_block_volume *v = &volumes[idx];
192 dev_t dev;
193
194 dev = bl_resolve_deviceid(server, v, gfp_mask);
195 if (!dev)
196 return -EIO;
197
198 d->bdev = blkdev_get_by_dev(dev, FMODE_READ, NULL);
199 if (IS_ERR(d->bdev)) {
200 printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",
201 MAJOR(dev), MINOR(dev), PTR_ERR(d->bdev));
202 return PTR_ERR(d->bdev);
203 }
204
205
206 d->len = i_size_read(d->bdev->bd_inode);
207 d->map = bl_map_simple;
208
209 printk(KERN_INFO "pNFS: using block device %s\n",
210 d->bdev->bd_disk->disk_name);
211 return 0;
212}
213
214static int
215bl_parse_slice(struct nfs_server *server, struct pnfs_block_dev *d,
216 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
217{
218 struct pnfs_block_volume *v = &volumes[idx];
219 int ret;
220
221 ret = bl_parse_deviceid(server, d, volumes, v->slice.volume, gfp_mask);
222 if (ret)
223 return ret;
224
225 d->disk_offset = v->slice.start;
226 d->len = v->slice.len;
227 return 0;
228}
229
230static int
231bl_parse_concat(struct nfs_server *server, struct pnfs_block_dev *d,
232 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
233{
234 struct pnfs_block_volume *v = &volumes[idx];
235 u64 len = 0;
236 int ret, i;
237
238 d->children = kcalloc(v->concat.volumes_count,
239 sizeof(struct pnfs_block_dev), GFP_KERNEL);
240 if (!d->children)
241 return -ENOMEM;
242
243 for (i = 0; i < v->concat.volumes_count; i++) {
244 ret = bl_parse_deviceid(server, &d->children[i],
245 volumes, v->concat.volumes[i], gfp_mask);
246 if (ret)
247 return ret;
248
249 d->nr_children++;
250 d->children[i].start += len;
251 len += d->children[i].len;
252 }
253
254 d->len = len;
255 d->map = bl_map_concat;
256 return 0;
257}
258
259static int
260bl_parse_stripe(struct nfs_server *server, struct pnfs_block_dev *d,
261 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
262{
263 struct pnfs_block_volume *v = &volumes[idx];
264 u64 len = 0;
265 int ret, i;
266
267 d->children = kcalloc(v->stripe.volumes_count,
268 sizeof(struct pnfs_block_dev), GFP_KERNEL);
269 if (!d->children)
270 return -ENOMEM;
271
272 for (i = 0; i < v->stripe.volumes_count; i++) {
273 ret = bl_parse_deviceid(server, &d->children[i],
274 volumes, v->stripe.volumes[i], gfp_mask);
275 if (ret)
276 return ret;
277
278 d->nr_children++;
279 len += d->children[i].len;
280 }
281
282 d->len = len;
283 d->chunk_size = v->stripe.chunk_size;
284 d->map = bl_map_stripe;
285 return 0;
286}
287
288static int
289bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
290 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
291{
292 switch (volumes[idx].type) {
293 case PNFS_BLOCK_VOLUME_SIMPLE:
294 return bl_parse_simple(server, d, volumes, idx, gfp_mask);
295 case PNFS_BLOCK_VOLUME_SLICE:
296 return bl_parse_slice(server, d, volumes, idx, gfp_mask);
297 case PNFS_BLOCK_VOLUME_CONCAT:
298 return bl_parse_concat(server, d, volumes, idx, gfp_mask);
299 case PNFS_BLOCK_VOLUME_STRIPE:
300 return bl_parse_stripe(server, d, volumes, idx, gfp_mask);
301 default:
302 dprintk("unsupported volume type: %d\n", volumes[idx].type);
303 return -EIO;
304 }
305}
306
307struct nfs4_deviceid_node *
308bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
309 gfp_t gfp_mask)
310{
311 struct nfs4_deviceid_node *node = NULL;
312 struct pnfs_block_volume *volumes;
313 struct pnfs_block_dev *top;
314 struct xdr_stream xdr;
315 struct xdr_buf buf;
316 struct page *scratch;
317 int nr_volumes, ret, i;
318 __be32 *p;
319
320 scratch = alloc_page(gfp_mask);
321 if (!scratch)
322 goto out;
323
324 xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen);
325 xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);
326
327 p = xdr_inline_decode(&xdr, sizeof(__be32));
328 if (!p)
329 goto out_free_scratch;
330 nr_volumes = be32_to_cpup(p++);
331
332 volumes = kcalloc(nr_volumes, sizeof(struct pnfs_block_volume),
333 gfp_mask);
334 if (!volumes)
335 goto out_free_scratch;
336
337 for (i = 0; i < nr_volumes; i++) {
338 ret = nfs4_block_decode_volume(&xdr, &volumes[i]);
339 if (ret < 0)
340 goto out_free_volumes;
341 }
342
343 top = kzalloc(sizeof(*top), gfp_mask);
344 if (!top)
345 goto out_free_volumes;
346
347 ret = bl_parse_deviceid(server, top, volumes, nr_volumes - 1, gfp_mask);
348 if (ret) {
349 bl_free_device(top);
350 kfree(top);
351 goto out_free_volumes;
352 }
353
354 node = &top->node;
355 nfs4_init_deviceid_node(node, server, &pdev->dev_id);
356
357out_free_volumes:
358 kfree(volumes);
359out_free_scratch:
360 __free_page(scratch);
361out:
362 return node;
363}
364
