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1/*
2 * Copyright (c) 2014-2016 Christoph Hellwig.
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#include <linux/pr.h>
10
11#include "blocklayout.h"
12
13#define NFSDBG_FACILITY NFSDBG_PNFS_LD
14
15static void
16bl_free_device(struct pnfs_block_dev *dev)
17{
18 if (dev->nr_children) {
19 int i;
20
21 for (i = 0; i < dev->nr_children; i++)
22 bl_free_device(&dev->children[i]);
23 kfree(dev->children);
24 } else {
25 if (dev->pr_registered) {
26 const struct pr_ops *ops =
27 dev->bdev->bd_disk->fops->pr_ops;
28 int error;
29
30 error = ops->pr_register(dev->bdev, dev->pr_key, 0,
31 false);
32 if (error)
33 pr_err("failed to unregister PR key.\n");
34 }
35
36 if (dev->bdev)
37 blkdev_put(dev->bdev, FMODE_READ | FMODE_WRITE);
38 }
39}
40
41void
42bl_free_deviceid_node(struct nfs4_deviceid_node *d)
43{
44 struct pnfs_block_dev *dev =
45 container_of(d, struct pnfs_block_dev, node);
46
47 bl_free_device(dev);
48 kfree_rcu(dev, node.rcu);
49}
50
51static int
52nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
53{
54 __be32 *p;
55 int i;
56
57 p = xdr_inline_decode(xdr, 4);
58 if (!p)
59 return -EIO;
60 b->type = be32_to_cpup(p++);
61
62 switch (b->type) {
63 case PNFS_BLOCK_VOLUME_SIMPLE:
64 p = xdr_inline_decode(xdr, 4);
65 if (!p)
66 return -EIO;
67 b->simple.nr_sigs = be32_to_cpup(p++);
68 if (!b->simple.nr_sigs) {
69 dprintk("no signature\n");
70 return -EIO;
71 }
72
73 b->simple.len = 4 + 4;
74 for (i = 0; i < b->simple.nr_sigs; i++) {
75 p = xdr_inline_decode(xdr, 8 + 4);
76 if (!p)
77 return -EIO;
78 p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);
79 b->simple.sigs[i].sig_len = be32_to_cpup(p++);
80 if (b->simple.sigs[i].sig_len > PNFS_BLOCK_UUID_LEN) {
81 pr_info("signature too long: %d\n",
82 b->simple.sigs[i].sig_len);
83 return -EIO;
84 }
85
86 p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);
87 if (!p)
88 return -EIO;
89 memcpy(&b->simple.sigs[i].sig, p,
90 b->simple.sigs[i].sig_len);
91
92 b->simple.len += 8 + 4 + b->simple.sigs[i].sig_len;
93 }
94 break;
95 case PNFS_BLOCK_VOLUME_SLICE:
96 p = xdr_inline_decode(xdr, 8 + 8 + 4);
97 if (!p)
98 return -EIO;
99 p = xdr_decode_hyper(p, &b->slice.start);
100 p = xdr_decode_hyper(p, &b->slice.len);
101 b->slice.volume = be32_to_cpup(p++);
102 break;
103 case PNFS_BLOCK_VOLUME_CONCAT:
104 p = xdr_inline_decode(xdr, 4);
105 if (!p)
106 return -EIO;
107 b->concat.volumes_count = be32_to_cpup(p++);
108
109 p = xdr_inline_decode(xdr, b->concat.volumes_count * 4);
110 if (!p)
111 return -EIO;
112 for (i = 0; i < b->concat.volumes_count; i++)
113 b->concat.volumes[i] = be32_to_cpup(p++);
114 break;
115 case PNFS_BLOCK_VOLUME_STRIPE:
116 p = xdr_inline_decode(xdr, 8 + 4);
117 if (!p)
118 return -EIO;
119 p = xdr_decode_hyper(p, &b->stripe.chunk_size);
120 b->stripe.volumes_count = be32_to_cpup(p++);
121
122 p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4);
123 if (!p)
124 return -EIO;
125 for (i = 0; i < b->stripe.volumes_count; i++)
126 b->stripe.volumes[i] = be32_to_cpup(p++);
127 break;
128 case PNFS_BLOCK_VOLUME_SCSI:
129 p = xdr_inline_decode(xdr, 4 + 4 + 4);
130 if (!p)
131 return -EIO;
132 b->scsi.code_set = be32_to_cpup(p++);
133 b->scsi.designator_type = be32_to_cpup(p++);
134 b->scsi.designator_len = be32_to_cpup(p++);
135 p = xdr_inline_decode(xdr, b->scsi.designator_len);
136 if (!p)
137 return -EIO;
138 if (b->scsi.designator_len > 256)
139 return -EIO;
140 memcpy(&b->scsi.designator, p, b->scsi.designator_len);
141 p = xdr_inline_decode(xdr, 8);
142 if (!p)
143 return -EIO;
144 p = xdr_decode_hyper(p, &b->scsi.pr_key);
145 break;
146 default:
147 dprintk("unknown volume type!\n");
148 return -EIO;
149 }
150
151 return 0;
152}
153
154static bool bl_map_simple(struct pnfs_block_dev *dev, u64 offset,
155 struct pnfs_block_dev_map *map)
156{
157 map->start = dev->start;
158 map->len = dev->len;
159 map->disk_offset = dev->disk_offset;
160 map->bdev = dev->bdev;
161 return true;
162}
163
164static bool bl_map_concat(struct pnfs_block_dev *dev, u64 offset,
165 struct pnfs_block_dev_map *map)
166{
167 int i;
168
169 for (i = 0; i < dev->nr_children; i++) {
170 struct pnfs_block_dev *child = &dev->children[i];
171
172 if (child->start > offset ||
173 child->start + child->len <= offset)
174 continue;
175
176 child->map(child, offset - child->start, map);
177 return true;
178 }
179
180 dprintk("%s: ran off loop!\n", __func__);
181 return false;
182}
183
184static bool bl_map_stripe(struct pnfs_block_dev *dev, u64 offset,
185 struct pnfs_block_dev_map *map)
186{
187 struct pnfs_block_dev *child;
188 u64 chunk;
189 u32 chunk_idx;
190 u64 disk_offset;
191
192 chunk = div_u64(offset, dev->chunk_size);
193 div_u64_rem(chunk, dev->nr_children, &chunk_idx);
194
195 if (chunk_idx > dev->nr_children) {
196 dprintk("%s: invalid chunk idx %d (%lld/%lld)\n",
197 __func__, chunk_idx, offset, dev->chunk_size);
198 /* error, should not happen */
199 return false;
200 }
201
202 /* truncate offset to the beginning of the stripe */
203 offset = chunk * dev->chunk_size;
204
205 /* disk offset of the stripe */
206 disk_offset = div_u64(offset, dev->nr_children);
207
208 child = &dev->children[chunk_idx];
209 child->map(child, disk_offset, map);
210
211 map->start += offset;
212 map->disk_offset += disk_offset;
213 map->len = dev->chunk_size;
214 return true;
215}
216
217static int
218bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
219 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);
220
221
222static int
223bl_parse_simple(struct nfs_server *server, struct pnfs_block_dev *d,
224 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
225{
226 struct pnfs_block_volume *v = &volumes[idx];
227 dev_t dev;
228
229 dev = bl_resolve_deviceid(server, v, gfp_mask);
230 if (!dev)
231 return -EIO;
232
233 d->bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL);
234 if (IS_ERR(d->bdev)) {
235 printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",
236 MAJOR(dev), MINOR(dev), PTR_ERR(d->bdev));
237 return PTR_ERR(d->bdev);
238 }
239
240
241 d->len = i_size_read(d->bdev->bd_inode);
242 d->map = bl_map_simple;
243
244 printk(KERN_INFO "pNFS: using block device %s\n",
245 d->bdev->bd_disk->disk_name);
246 return 0;
247}
248
249static bool
250bl_validate_designator(struct pnfs_block_volume *v)
251{
252 switch (v->scsi.designator_type) {
253 case PS_DESIGNATOR_EUI64:
254 if (v->scsi.code_set != PS_CODE_SET_BINARY)
255 return false;
256
257 if (v->scsi.designator_len != 8 &&
258 v->scsi.designator_len != 10 &&
259 v->scsi.designator_len != 16)
260 return false;
261
262 return true;
263 case PS_DESIGNATOR_NAA:
264 if (v->scsi.code_set != PS_CODE_SET_BINARY)
265 return false;
266
267 if (v->scsi.designator_len != 8 &&
268 v->scsi.designator_len != 16)
269 return false;
270
271 return true;
272 case PS_DESIGNATOR_T10:
273 case PS_DESIGNATOR_NAME:
274 pr_err("pNFS: unsupported designator "
275 "(code set %d, type %d, len %d.\n",
276 v->scsi.code_set,
277 v->scsi.designator_type,
278 v->scsi.designator_len);
279 return false;
280 default:
281 pr_err("pNFS: invalid designator "
282 "(code set %d, type %d, len %d.\n",
283 v->scsi.code_set,
284 v->scsi.designator_type,
285 v->scsi.designator_len);
286 return false;
287 }
288}
289
290static int
291bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d,
292 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
293{
294 struct pnfs_block_volume *v = &volumes[idx];
295 const struct pr_ops *ops;
296 const char *devname;
297 int error;
298
299 if (!bl_validate_designator(v))
300 return -EINVAL;
301
302 switch (v->scsi.designator_len) {
303 case 8:
304 devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%8phN",
305 v->scsi.designator);
306 break;
307 case 12:
308 devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%12phN",
309 v->scsi.designator);
310 break;
311 case 16:
312 devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%16phN",
313 v->scsi.designator);
314 break;
315 default:
316 return -EINVAL;
317 }
318
319 d->bdev = blkdev_get_by_path(devname, FMODE_READ, NULL);
320 if (IS_ERR(d->bdev)) {
321 pr_warn("pNFS: failed to open device %s (%ld)\n",
322 devname, PTR_ERR(d->bdev));
323 kfree(devname);
324 return PTR_ERR(d->bdev);
325 }
326
327 kfree(devname);
328
329 d->len = i_size_read(d->bdev->bd_inode);
330 d->map = bl_map_simple;
331 d->pr_key = v->scsi.pr_key;
332
333 pr_info("pNFS: using block device %s (reservation key 0x%llx)\n",
334 d->bdev->bd_disk->disk_name, d->pr_key);
335
336 ops = d->bdev->bd_disk->fops->pr_ops;
337 if (!ops) {
338 pr_err("pNFS: block device %s does not support reservations.",
339 d->bdev->bd_disk->disk_name);
340 error = -EINVAL;
341 goto out_blkdev_put;
342 }
343
344 error = ops->pr_register(d->bdev, 0, d->pr_key, true);
345 if (error) {
346 pr_err("pNFS: failed to register key for block device %s.",
347 d->bdev->bd_disk->disk_name);
348 goto out_blkdev_put;
349 }
350
351 d->pr_registered = true;
352 return 0;
353
354out_blkdev_put:
355 blkdev_put(d->bdev, FMODE_READ);
356 return error;
357}
358
359static int
360bl_parse_slice(struct nfs_server *server, struct pnfs_block_dev *d,
361 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
362{
363 struct pnfs_block_volume *v = &volumes[idx];
364 int ret;
365
366 ret = bl_parse_deviceid(server, d, volumes, v->slice.volume, gfp_mask);
367 if (ret)
368 return ret;
369
370 d->disk_offset = v->slice.start;
371 d->len = v->slice.len;
372 return 0;
373}
374
375static int
376bl_parse_concat(struct nfs_server *server, struct pnfs_block_dev *d,
377 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
378{
379 struct pnfs_block_volume *v = &volumes[idx];
380 u64 len = 0;
381 int ret, i;
382
383 d->children = kcalloc(v->concat.volumes_count,
384 sizeof(struct pnfs_block_dev), GFP_KERNEL);
385 if (!d->children)
386 return -ENOMEM;
387
388 for (i = 0; i < v->concat.volumes_count; i++) {
389 ret = bl_parse_deviceid(server, &d->children[i],
390 volumes, v->concat.volumes[i], gfp_mask);
391 if (ret)
392 return ret;
393
394 d->nr_children++;
395 d->children[i].start += len;
396 len += d->children[i].len;
397 }
398
399 d->len = len;
400 d->map = bl_map_concat;
401 return 0;
402}
403
404static int
405bl_parse_stripe(struct nfs_server *server, struct pnfs_block_dev *d,
406 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
407{
408 struct pnfs_block_volume *v = &volumes[idx];
409 u64 len = 0;
410 int ret, i;
411
412 d->children = kcalloc(v->stripe.volumes_count,
413 sizeof(struct pnfs_block_dev), GFP_KERNEL);
414 if (!d->children)
415 return -ENOMEM;
416
417 for (i = 0; i < v->stripe.volumes_count; i++) {
418 ret = bl_parse_deviceid(server, &d->children[i],
419 volumes, v->stripe.volumes[i], gfp_mask);
420 if (ret)
421 return ret;
422
423 d->nr_children++;
424 len += d->children[i].len;
425 }
426
427 d->len = len;
428 d->chunk_size = v->stripe.chunk_size;
429 d->map = bl_map_stripe;
430 return 0;
431}
432
433static int
434bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
435 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
436{
437 switch (volumes[idx].type) {
438 case PNFS_BLOCK_VOLUME_SIMPLE:
439 return bl_parse_simple(server, d, volumes, idx, gfp_mask);
440 case PNFS_BLOCK_VOLUME_SLICE:
441 return bl_parse_slice(server, d, volumes, idx, gfp_mask);
442 case PNFS_BLOCK_VOLUME_CONCAT:
443 return bl_parse_concat(server, d, volumes, idx, gfp_mask);
444 case PNFS_BLOCK_VOLUME_STRIPE:
445 return bl_parse_stripe(server, d, volumes, idx, gfp_mask);
446 case PNFS_BLOCK_VOLUME_SCSI:
447 return bl_parse_scsi(server, d, volumes, idx, gfp_mask);
448 default:
449 dprintk("unsupported volume type: %d\n", volumes[idx].type);
450 return -EIO;
451 }
452}
453
454struct nfs4_deviceid_node *
455bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
456 gfp_t gfp_mask)
457{
458 struct nfs4_deviceid_node *node = NULL;
459 struct pnfs_block_volume *volumes;
460 struct pnfs_block_dev *top;
461 struct xdr_stream xdr;
462 struct xdr_buf buf;
463 struct page *scratch;
464 int nr_volumes, ret, i;
465 __be32 *p;
466
467 scratch = alloc_page(gfp_mask);
468 if (!scratch)
469 goto out;
470
471 xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen);
472 xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);
473
474 p = xdr_inline_decode(&xdr, sizeof(__be32));
475 if (!p)
476 goto out_free_scratch;
477 nr_volumes = be32_to_cpup(p++);
478
479 volumes = kcalloc(nr_volumes, sizeof(struct pnfs_block_volume),
480 gfp_mask);
481 if (!volumes)
482 goto out_free_scratch;
483
484 for (i = 0; i < nr_volumes; i++) {
485 ret = nfs4_block_decode_volume(&xdr, &volumes[i]);
486 if (ret < 0)
487 goto out_free_volumes;
488 }
489
490 top = kzalloc(sizeof(*top), gfp_mask);
491 if (!top)
492 goto out_free_volumes;
493
494 ret = bl_parse_deviceid(server, top, volumes, nr_volumes - 1, gfp_mask);
495 if (ret) {
496 bl_free_device(top);
497 kfree(top);
498 goto out_free_volumes;
499 }
500
501 node = &top->node;
502 nfs4_init_deviceid_node(node, server, &pdev->dev_id);
503
504out_free_volumes:
505 kfree(volumes);
506out_free_scratch:
507 __free_page(scratch);
508out:
509 return node;
510}