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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/blkdev.h>
7#include <linux/nfs4.h>
8#include <linux/nfs_fs.h>
9#include <linux/nfs_xdr.h>
10#include <linux/pr.h>
11
12#include "blocklayout.h"
13
14#define NFSDBG_FACILITY NFSDBG_PNFS_LD
15
16static void
17bl_free_device(struct pnfs_block_dev *dev)
18{
19 if (dev->nr_children) {
20 int i;
21
22 for (i = 0; i < dev->nr_children; i++)
23 bl_free_device(&dev->children[i]);
24 kfree(dev->children);
25 } else {
26 if (dev->pr_registered) {
27 const struct pr_ops *ops =
28 dev->bdev->bd_disk->fops->pr_ops;
29 int error;
30
31 error = ops->pr_register(dev->bdev, dev->pr_key, 0,
32 false);
33 if (error)
34 pr_err("failed to unregister PR key.\n");
35 }
36
37 if (dev->bdev)
38 blkdev_put(dev->bdev, FMODE_READ | FMODE_WRITE);
39 }
40}
41
42void
43bl_free_deviceid_node(struct nfs4_deviceid_node *d)
44{
45 struct pnfs_block_dev *dev =
46 container_of(d, struct pnfs_block_dev, node);
47
48 bl_free_device(dev);
49 kfree_rcu(dev, node.rcu);
50}
51
52static int
53nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
54{
55 __be32 *p;
56 int i;
57
58 p = xdr_inline_decode(xdr, 4);
59 if (!p)
60 return -EIO;
61 b->type = be32_to_cpup(p++);
62
63 switch (b->type) {
64 case PNFS_BLOCK_VOLUME_SIMPLE:
65 p = xdr_inline_decode(xdr, 4);
66 if (!p)
67 return -EIO;
68 b->simple.nr_sigs = be32_to_cpup(p++);
69 if (!b->simple.nr_sigs || b->simple.nr_sigs > PNFS_BLOCK_MAX_UUIDS) {
70 dprintk("Bad signature count: %d\n", b->simple.nr_sigs);
71 return -EIO;
72 }
73
74 b->simple.len = 4 + 4;
75 for (i = 0; i < b->simple.nr_sigs; i++) {
76 p = xdr_inline_decode(xdr, 8 + 4);
77 if (!p)
78 return -EIO;
79 p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);
80 b->simple.sigs[i].sig_len = be32_to_cpup(p++);
81 if (b->simple.sigs[i].sig_len > PNFS_BLOCK_UUID_LEN) {
82 pr_info("signature too long: %d\n",
83 b->simple.sigs[i].sig_len);
84 return -EIO;
85 }
86
87 p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);
88 if (!p)
89 return -EIO;
90 memcpy(&b->simple.sigs[i].sig, p,
91 b->simple.sigs[i].sig_len);
92
93 b->simple.len += 8 + 4 + \
94 (XDR_QUADLEN(b->simple.sigs[i].sig_len) << 2);
95 }
96 break;
97 case PNFS_BLOCK_VOLUME_SLICE:
98 p = xdr_inline_decode(xdr, 8 + 8 + 4);
99 if (!p)
100 return -EIO;
101 p = xdr_decode_hyper(p, &b->slice.start);
102 p = xdr_decode_hyper(p, &b->slice.len);
103 b->slice.volume = be32_to_cpup(p++);
104 break;
105 case PNFS_BLOCK_VOLUME_CONCAT:
106 p = xdr_inline_decode(xdr, 4);
107 if (!p)
108 return -EIO;
109
110 b->concat.volumes_count = be32_to_cpup(p++);
111 if (b->concat.volumes_count > PNFS_BLOCK_MAX_DEVICES) {
112 dprintk("Too many volumes: %d\n", b->concat.volumes_count);
113 return -EIO;
114 }
115
116 p = xdr_inline_decode(xdr, b->concat.volumes_count * 4);
117 if (!p)
118 return -EIO;
119 for (i = 0; i < b->concat.volumes_count; i++)
120 b->concat.volumes[i] = be32_to_cpup(p++);
121 break;
122 case PNFS_BLOCK_VOLUME_STRIPE:
123 p = xdr_inline_decode(xdr, 8 + 4);
124 if (!p)
125 return -EIO;
126
127 p = xdr_decode_hyper(p, &b->stripe.chunk_size);
128 b->stripe.volumes_count = be32_to_cpup(p++);
129 if (b->stripe.volumes_count > PNFS_BLOCK_MAX_DEVICES) {
130 dprintk("Too many volumes: %d\n", b->stripe.volumes_count);
131 return -EIO;
132 }
133
134 p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4);
135 if (!p)
136 return -EIO;
137 for (i = 0; i < b->stripe.volumes_count; i++)
138 b->stripe.volumes[i] = be32_to_cpup(p++);
139 break;
140 case PNFS_BLOCK_VOLUME_SCSI:
141 p = xdr_inline_decode(xdr, 4 + 4 + 4);
142 if (!p)
143 return -EIO;
144 b->scsi.code_set = be32_to_cpup(p++);
145 b->scsi.designator_type = be32_to_cpup(p++);
146 b->scsi.designator_len = be32_to_cpup(p++);
147 p = xdr_inline_decode(xdr, b->scsi.designator_len);
148 if (!p)
149 return -EIO;
150 if (b->scsi.designator_len > 256)
151 return -EIO;
152 memcpy(&b->scsi.designator, p, b->scsi.designator_len);
153 p = xdr_inline_decode(xdr, 8);
154 if (!p)
155 return -EIO;
156 p = xdr_decode_hyper(p, &b->scsi.pr_key);
157 break;
158 default:
159 dprintk("unknown volume type!\n");
160 return -EIO;
161 }
162
163 return 0;
164}
165
166static bool bl_map_simple(struct pnfs_block_dev *dev, u64 offset,
167 struct pnfs_block_dev_map *map)
168{
169 map->start = dev->start;
170 map->len = dev->len;
171 map->disk_offset = dev->disk_offset;
172 map->bdev = dev->bdev;
173 return true;
174}
175
176static bool bl_map_concat(struct pnfs_block_dev *dev, u64 offset,
177 struct pnfs_block_dev_map *map)
178{
179 int i;
180
181 for (i = 0; i < dev->nr_children; i++) {
182 struct pnfs_block_dev *child = &dev->children[i];
183
184 if (child->start > offset ||
185 child->start + child->len <= offset)
186 continue;
187
188 child->map(child, offset - child->start, map);
189 return true;
190 }
191
192 dprintk("%s: ran off loop!\n", __func__);
193 return false;
194}
195
196static bool bl_map_stripe(struct pnfs_block_dev *dev, u64 offset,
197 struct pnfs_block_dev_map *map)
198{
199 struct pnfs_block_dev *child;
200 u64 chunk;
201 u32 chunk_idx;
202 u64 disk_offset;
203
204 chunk = div_u64(offset, dev->chunk_size);
205 div_u64_rem(chunk, dev->nr_children, &chunk_idx);
206
207 if (chunk_idx > dev->nr_children) {
208 dprintk("%s: invalid chunk idx %d (%lld/%lld)\n",
209 __func__, chunk_idx, offset, dev->chunk_size);
210 /* error, should not happen */
211 return false;
212 }
213
214 /* truncate offset to the beginning of the stripe */
215 offset = chunk * dev->chunk_size;
216
217 /* disk offset of the stripe */
218 disk_offset = div_u64(offset, dev->nr_children);
219
220 child = &dev->children[chunk_idx];
221 child->map(child, disk_offset, map);
222
223 map->start += offset;
224 map->disk_offset += disk_offset;
225 map->len = dev->chunk_size;
226 return true;
227}
228
229static int
230bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
231 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);
232
233
234static int
235bl_parse_simple(struct nfs_server *server, struct pnfs_block_dev *d,
236 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
237{
238 struct pnfs_block_volume *v = &volumes[idx];
239 struct block_device *bdev;
240 dev_t dev;
241
242 dev = bl_resolve_deviceid(server, v, gfp_mask);
243 if (!dev)
244 return -EIO;
245
246 bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL);
247 if (IS_ERR(bdev)) {
248 printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",
249 MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
250 return PTR_ERR(bdev);
251 }
252 d->bdev = bdev;
253
254
255 d->len = i_size_read(d->bdev->bd_inode);
256 d->map = bl_map_simple;
257
258 printk(KERN_INFO "pNFS: using block device %s\n",
259 d->bdev->bd_disk->disk_name);
260 return 0;
261}
262
263static bool
264bl_validate_designator(struct pnfs_block_volume *v)
265{
266 switch (v->scsi.designator_type) {
267 case PS_DESIGNATOR_EUI64:
268 if (v->scsi.code_set != PS_CODE_SET_BINARY)
269 return false;
270
271 if (v->scsi.designator_len != 8 &&
272 v->scsi.designator_len != 10 &&
273 v->scsi.designator_len != 16)
274 return false;
275
276 return true;
277 case PS_DESIGNATOR_NAA:
278 if (v->scsi.code_set != PS_CODE_SET_BINARY)
279 return false;
280
281 if (v->scsi.designator_len != 8 &&
282 v->scsi.designator_len != 16)
283 return false;
284
285 return true;
286 case PS_DESIGNATOR_T10:
287 case PS_DESIGNATOR_NAME:
288 pr_err("pNFS: unsupported designator "
289 "(code set %d, type %d, len %d.\n",
290 v->scsi.code_set,
291 v->scsi.designator_type,
292 v->scsi.designator_len);
293 return false;
294 default:
295 pr_err("pNFS: invalid designator "
296 "(code set %d, type %d, len %d.\n",
297 v->scsi.code_set,
298 v->scsi.designator_type,
299 v->scsi.designator_len);
300 return false;
301 }
302}
303
304/*
305 * Try to open the udev path for the WWN. At least on Debian the udev
306 * by-id path will always point to the dm-multipath device if one exists.
307 */
308static struct block_device *
309bl_open_udev_path(struct pnfs_block_volume *v)
310{
311 struct block_device *bdev;
312 const char *devname;
313
314 devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%*phN",
315 v->scsi.designator_len, v->scsi.designator);
316 if (!devname)
317 return ERR_PTR(-ENOMEM);
318
319 bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL);
320 if (IS_ERR(bdev)) {
321 pr_warn("pNFS: failed to open device %s (%ld)\n",
322 devname, PTR_ERR(bdev));
323 }
324
325 kfree(devname);
326 return bdev;
327}
328
329/*
330 * Try to open the RH/Fedora specific dm-mpath udev path for this WWN, as the
331 * wwn- links will only point to the first discovered SCSI device there.
332 */
333static struct block_device *
334bl_open_dm_mpath_udev_path(struct pnfs_block_volume *v)
335{
336 struct block_device *bdev;
337 const char *devname;
338
339 devname = kasprintf(GFP_KERNEL,
340 "/dev/disk/by-id/dm-uuid-mpath-%d%*phN",
341 v->scsi.designator_type,
342 v->scsi.designator_len, v->scsi.designator);
343 if (!devname)
344 return ERR_PTR(-ENOMEM);
345
346 bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL);
347 kfree(devname);
348 return bdev;
349}
350
351static int
352bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d,
353 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
354{
355 struct pnfs_block_volume *v = &volumes[idx];
356 struct block_device *bdev;
357 const struct pr_ops *ops;
358 int error;
359
360 if (!bl_validate_designator(v))
361 return -EINVAL;
362
363 bdev = bl_open_dm_mpath_udev_path(v);
364 if (IS_ERR(bdev))
365 bdev = bl_open_udev_path(v);
366 if (IS_ERR(bdev))
367 return PTR_ERR(bdev);
368 d->bdev = bdev;
369
370 d->len = i_size_read(d->bdev->bd_inode);
371 d->map = bl_map_simple;
372 d->pr_key = v->scsi.pr_key;
373
374 pr_info("pNFS: using block device %s (reservation key 0x%llx)\n",
375 d->bdev->bd_disk->disk_name, d->pr_key);
376
377 ops = d->bdev->bd_disk->fops->pr_ops;
378 if (!ops) {
379 pr_err("pNFS: block device %s does not support reservations.",
380 d->bdev->bd_disk->disk_name);
381 error = -EINVAL;
382 goto out_blkdev_put;
383 }
384
385 error = ops->pr_register(d->bdev, 0, d->pr_key, true);
386 if (error) {
387 pr_err("pNFS: failed to register key for block device %s.",
388 d->bdev->bd_disk->disk_name);
389 goto out_blkdev_put;
390 }
391
392 d->pr_registered = true;
393 return 0;
394
395out_blkdev_put:
396 blkdev_put(d->bdev, FMODE_READ | FMODE_WRITE);
397 return error;
398}
399
400static int
401bl_parse_slice(struct nfs_server *server, struct pnfs_block_dev *d,
402 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
403{
404 struct pnfs_block_volume *v = &volumes[idx];
405 int ret;
406
407 ret = bl_parse_deviceid(server, d, volumes, v->slice.volume, gfp_mask);
408 if (ret)
409 return ret;
410
411 d->disk_offset = v->slice.start;
412 d->len = v->slice.len;
413 return 0;
414}
415
416static int
417bl_parse_concat(struct nfs_server *server, struct pnfs_block_dev *d,
418 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
419{
420 struct pnfs_block_volume *v = &volumes[idx];
421 u64 len = 0;
422 int ret, i;
423
424 d->children = kcalloc(v->concat.volumes_count,
425 sizeof(struct pnfs_block_dev), GFP_KERNEL);
426 if (!d->children)
427 return -ENOMEM;
428
429 for (i = 0; i < v->concat.volumes_count; i++) {
430 ret = bl_parse_deviceid(server, &d->children[i],
431 volumes, v->concat.volumes[i], gfp_mask);
432 if (ret)
433 return ret;
434
435 d->nr_children++;
436 d->children[i].start += len;
437 len += d->children[i].len;
438 }
439
440 d->len = len;
441 d->map = bl_map_concat;
442 return 0;
443}
444
445static int
446bl_parse_stripe(struct nfs_server *server, struct pnfs_block_dev *d,
447 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
448{
449 struct pnfs_block_volume *v = &volumes[idx];
450 u64 len = 0;
451 int ret, i;
452
453 d->children = kcalloc(v->stripe.volumes_count,
454 sizeof(struct pnfs_block_dev), GFP_KERNEL);
455 if (!d->children)
456 return -ENOMEM;
457
458 for (i = 0; i < v->stripe.volumes_count; i++) {
459 ret = bl_parse_deviceid(server, &d->children[i],
460 volumes, v->stripe.volumes[i], gfp_mask);
461 if (ret)
462 return ret;
463
464 d->nr_children++;
465 len += d->children[i].len;
466 }
467
468 d->len = len;
469 d->chunk_size = v->stripe.chunk_size;
470 d->map = bl_map_stripe;
471 return 0;
472}
473
474static int
475bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
476 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
477{
478 switch (volumes[idx].type) {
479 case PNFS_BLOCK_VOLUME_SIMPLE:
480 return bl_parse_simple(server, d, volumes, idx, gfp_mask);
481 case PNFS_BLOCK_VOLUME_SLICE:
482 return bl_parse_slice(server, d, volumes, idx, gfp_mask);
483 case PNFS_BLOCK_VOLUME_CONCAT:
484 return bl_parse_concat(server, d, volumes, idx, gfp_mask);
485 case PNFS_BLOCK_VOLUME_STRIPE:
486 return bl_parse_stripe(server, d, volumes, idx, gfp_mask);
487 case PNFS_BLOCK_VOLUME_SCSI:
488 return bl_parse_scsi(server, d, volumes, idx, gfp_mask);
489 default:
490 dprintk("unsupported volume type: %d\n", volumes[idx].type);
491 return -EIO;
492 }
493}
494
495struct nfs4_deviceid_node *
496bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
497 gfp_t gfp_mask)
498{
499 struct nfs4_deviceid_node *node = NULL;
500 struct pnfs_block_volume *volumes;
501 struct pnfs_block_dev *top;
502 struct xdr_stream xdr;
503 struct xdr_buf buf;
504 struct page *scratch;
505 int nr_volumes, ret, i;
506 __be32 *p;
507
508 scratch = alloc_page(gfp_mask);
509 if (!scratch)
510 goto out;
511
512 xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen);
513 xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);
514
515 p = xdr_inline_decode(&xdr, sizeof(__be32));
516 if (!p)
517 goto out_free_scratch;
518 nr_volumes = be32_to_cpup(p++);
519
520 volumes = kcalloc(nr_volumes, sizeof(struct pnfs_block_volume),
521 gfp_mask);
522 if (!volumes)
523 goto out_free_scratch;
524
525 for (i = 0; i < nr_volumes; i++) {
526 ret = nfs4_block_decode_volume(&xdr, &volumes[i]);
527 if (ret < 0)
528 goto out_free_volumes;
529 }
530
531 top = kzalloc(sizeof(*top), gfp_mask);
532 if (!top)
533 goto out_free_volumes;
534
535 ret = bl_parse_deviceid(server, top, volumes, nr_volumes - 1, gfp_mask);
536
537 node = &top->node;
538 nfs4_init_deviceid_node(node, server, &pdev->dev_id);
539 if (ret)
540 nfs4_mark_deviceid_unavailable(node);
541
542out_free_volumes:
543 kfree(volumes);
544out_free_scratch:
545 __free_page(scratch);
546out:
547 return node;
548}
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/blkdev.h>
7#include <linux/nfs4.h>
8#include <linux/nfs_fs.h>
9#include <linux/nfs_xdr.h>
10#include <linux/pr.h>
11
12#include "blocklayout.h"
13
14#define NFSDBG_FACILITY NFSDBG_PNFS_LD
15
16static void
17bl_free_device(struct pnfs_block_dev *dev)
18{
19 if (dev->nr_children) {
20 int i;
21
22 for (i = 0; i < dev->nr_children; i++)
23 bl_free_device(&dev->children[i]);
24 kfree(dev->children);
25 } else {
26 if (dev->pr_registered) {
27 const struct pr_ops *ops =
28 dev->bdev->bd_disk->fops->pr_ops;
29 int error;
30
31 error = ops->pr_register(dev->bdev, dev->pr_key, 0,
32 false);
33 if (error)
34 pr_err("failed to unregister PR key.\n");
35 }
36
37 if (dev->bdev)
38 blkdev_put(dev->bdev, FMODE_READ | FMODE_WRITE);
39 }
40}
41
42void
43bl_free_deviceid_node(struct nfs4_deviceid_node *d)
44{
45 struct pnfs_block_dev *dev =
46 container_of(d, struct pnfs_block_dev, node);
47
48 bl_free_device(dev);
49 kfree_rcu(dev, node.rcu);
50}
51
52static int
53nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
54{
55 __be32 *p;
56 int i;
57
58 p = xdr_inline_decode(xdr, 4);
59 if (!p)
60 return -EIO;
61 b->type = be32_to_cpup(p++);
62
63 switch (b->type) {
64 case PNFS_BLOCK_VOLUME_SIMPLE:
65 p = xdr_inline_decode(xdr, 4);
66 if (!p)
67 return -EIO;
68 b->simple.nr_sigs = be32_to_cpup(p++);
69 if (!b->simple.nr_sigs || b->simple.nr_sigs > PNFS_BLOCK_MAX_UUIDS) {
70 dprintk("Bad signature count: %d\n", b->simple.nr_sigs);
71 return -EIO;
72 }
73
74 b->simple.len = 4 + 4;
75 for (i = 0; i < b->simple.nr_sigs; i++) {
76 p = xdr_inline_decode(xdr, 8 + 4);
77 if (!p)
78 return -EIO;
79 p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);
80 b->simple.sigs[i].sig_len = be32_to_cpup(p++);
81 if (b->simple.sigs[i].sig_len > PNFS_BLOCK_UUID_LEN) {
82 pr_info("signature too long: %d\n",
83 b->simple.sigs[i].sig_len);
84 return -EIO;
85 }
86
87 p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);
88 if (!p)
89 return -EIO;
90 memcpy(&b->simple.sigs[i].sig, p,
91 b->simple.sigs[i].sig_len);
92
93 b->simple.len += 8 + 4 + \
94 (XDR_QUADLEN(b->simple.sigs[i].sig_len) << 2);
95 }
96 break;
97 case PNFS_BLOCK_VOLUME_SLICE:
98 p = xdr_inline_decode(xdr, 8 + 8 + 4);
99 if (!p)
100 return -EIO;
101 p = xdr_decode_hyper(p, &b->slice.start);
102 p = xdr_decode_hyper(p, &b->slice.len);
103 b->slice.volume = be32_to_cpup(p++);
104 break;
105 case PNFS_BLOCK_VOLUME_CONCAT:
106 p = xdr_inline_decode(xdr, 4);
107 if (!p)
108 return -EIO;
109
110 b->concat.volumes_count = be32_to_cpup(p++);
111 if (b->concat.volumes_count > PNFS_BLOCK_MAX_DEVICES) {
112 dprintk("Too many volumes: %d\n", b->concat.volumes_count);
113 return -EIO;
114 }
115
116 p = xdr_inline_decode(xdr, b->concat.volumes_count * 4);
117 if (!p)
118 return -EIO;
119 for (i = 0; i < b->concat.volumes_count; i++)
120 b->concat.volumes[i] = be32_to_cpup(p++);
121 break;
122 case PNFS_BLOCK_VOLUME_STRIPE:
123 p = xdr_inline_decode(xdr, 8 + 4);
124 if (!p)
125 return -EIO;
126
127 p = xdr_decode_hyper(p, &b->stripe.chunk_size);
128 b->stripe.volumes_count = be32_to_cpup(p++);
129 if (b->stripe.volumes_count > PNFS_BLOCK_MAX_DEVICES) {
130 dprintk("Too many volumes: %d\n", b->stripe.volumes_count);
131 return -EIO;
132 }
133
134 p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4);
135 if (!p)
136 return -EIO;
137 for (i = 0; i < b->stripe.volumes_count; i++)
138 b->stripe.volumes[i] = be32_to_cpup(p++);
139 break;
140 case PNFS_BLOCK_VOLUME_SCSI:
141 p = xdr_inline_decode(xdr, 4 + 4 + 4);
142 if (!p)
143 return -EIO;
144 b->scsi.code_set = be32_to_cpup(p++);
145 b->scsi.designator_type = be32_to_cpup(p++);
146 b->scsi.designator_len = be32_to_cpup(p++);
147 p = xdr_inline_decode(xdr, b->scsi.designator_len);
148 if (!p)
149 return -EIO;
150 if (b->scsi.designator_len > 256)
151 return -EIO;
152 memcpy(&b->scsi.designator, p, b->scsi.designator_len);
153 p = xdr_inline_decode(xdr, 8);
154 if (!p)
155 return -EIO;
156 p = xdr_decode_hyper(p, &b->scsi.pr_key);
157 break;
158 default:
159 dprintk("unknown volume type!\n");
160 return -EIO;
161 }
162
163 return 0;
164}
165
166static bool bl_map_simple(struct pnfs_block_dev *dev, u64 offset,
167 struct pnfs_block_dev_map *map)
168{
169 map->start = dev->start;
170 map->len = dev->len;
171 map->disk_offset = dev->disk_offset;
172 map->bdev = dev->bdev;
173 return true;
174}
175
176static bool bl_map_concat(struct pnfs_block_dev *dev, u64 offset,
177 struct pnfs_block_dev_map *map)
178{
179 int i;
180
181 for (i = 0; i < dev->nr_children; i++) {
182 struct pnfs_block_dev *child = &dev->children[i];
183
184 if (child->start > offset ||
185 child->start + child->len <= offset)
186 continue;
187
188 child->map(child, offset - child->start, map);
189 return true;
190 }
191
192 dprintk("%s: ran off loop!\n", __func__);
193 return false;
194}
195
196static bool bl_map_stripe(struct pnfs_block_dev *dev, u64 offset,
197 struct pnfs_block_dev_map *map)
198{
199 struct pnfs_block_dev *child;
200 u64 chunk;
201 u32 chunk_idx;
202 u64 disk_offset;
203
204 chunk = div_u64(offset, dev->chunk_size);
205 div_u64_rem(chunk, dev->nr_children, &chunk_idx);
206
207 if (chunk_idx >= dev->nr_children) {
208 dprintk("%s: invalid chunk idx %d (%lld/%lld)\n",
209 __func__, chunk_idx, offset, dev->chunk_size);
210 /* error, should not happen */
211 return false;
212 }
213
214 /* truncate offset to the beginning of the stripe */
215 offset = chunk * dev->chunk_size;
216
217 /* disk offset of the stripe */
218 disk_offset = div_u64(offset, dev->nr_children);
219
220 child = &dev->children[chunk_idx];
221 child->map(child, disk_offset, map);
222
223 map->start += offset;
224 map->disk_offset += disk_offset;
225 map->len = dev->chunk_size;
226 return true;
227}
228
229static int
230bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
231 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);
232
233
234static int
235bl_parse_simple(struct nfs_server *server, struct pnfs_block_dev *d,
236 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
237{
238 struct pnfs_block_volume *v = &volumes[idx];
239 struct block_device *bdev;
240 dev_t dev;
241
242 dev = bl_resolve_deviceid(server, v, gfp_mask);
243 if (!dev)
244 return -EIO;
245
246 bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL);
247 if (IS_ERR(bdev)) {
248 printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",
249 MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
250 return PTR_ERR(bdev);
251 }
252 d->bdev = bdev;
253
254
255 d->len = i_size_read(d->bdev->bd_inode);
256 d->map = bl_map_simple;
257
258 printk(KERN_INFO "pNFS: using block device %s\n",
259 d->bdev->bd_disk->disk_name);
260 return 0;
261}
262
263static bool
264bl_validate_designator(struct pnfs_block_volume *v)
265{
266 switch (v->scsi.designator_type) {
267 case PS_DESIGNATOR_EUI64:
268 if (v->scsi.code_set != PS_CODE_SET_BINARY)
269 return false;
270
271 if (v->scsi.designator_len != 8 &&
272 v->scsi.designator_len != 10 &&
273 v->scsi.designator_len != 16)
274 return false;
275
276 return true;
277 case PS_DESIGNATOR_NAA:
278 if (v->scsi.code_set != PS_CODE_SET_BINARY)
279 return false;
280
281 if (v->scsi.designator_len != 8 &&
282 v->scsi.designator_len != 16)
283 return false;
284
285 return true;
286 case PS_DESIGNATOR_T10:
287 case PS_DESIGNATOR_NAME:
288 pr_err("pNFS: unsupported designator "
289 "(code set %d, type %d, len %d.\n",
290 v->scsi.code_set,
291 v->scsi.designator_type,
292 v->scsi.designator_len);
293 return false;
294 default:
295 pr_err("pNFS: invalid designator "
296 "(code set %d, type %d, len %d.\n",
297 v->scsi.code_set,
298 v->scsi.designator_type,
299 v->scsi.designator_len);
300 return false;
301 }
302}
303
304/*
305 * Try to open the udev path for the WWN. At least on Debian the udev
306 * by-id path will always point to the dm-multipath device if one exists.
307 */
308static struct block_device *
309bl_open_udev_path(struct pnfs_block_volume *v)
310{
311 struct block_device *bdev;
312 const char *devname;
313
314 devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%*phN",
315 v->scsi.designator_len, v->scsi.designator);
316 if (!devname)
317 return ERR_PTR(-ENOMEM);
318
319 bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL);
320 if (IS_ERR(bdev)) {
321 pr_warn("pNFS: failed to open device %s (%ld)\n",
322 devname, PTR_ERR(bdev));
323 }
324
325 kfree(devname);
326 return bdev;
327}
328
329/*
330 * Try to open the RH/Fedora specific dm-mpath udev path for this WWN, as the
331 * wwn- links will only point to the first discovered SCSI device there.
332 */
333static struct block_device *
334bl_open_dm_mpath_udev_path(struct pnfs_block_volume *v)
335{
336 struct block_device *bdev;
337 const char *devname;
338
339 devname = kasprintf(GFP_KERNEL,
340 "/dev/disk/by-id/dm-uuid-mpath-%d%*phN",
341 v->scsi.designator_type,
342 v->scsi.designator_len, v->scsi.designator);
343 if (!devname)
344 return ERR_PTR(-ENOMEM);
345
346 bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL);
347 kfree(devname);
348 return bdev;
349}
350
351static int
352bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d,
353 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
354{
355 struct pnfs_block_volume *v = &volumes[idx];
356 struct block_device *bdev;
357 const struct pr_ops *ops;
358 int error;
359
360 if (!bl_validate_designator(v))
361 return -EINVAL;
362
363 bdev = bl_open_dm_mpath_udev_path(v);
364 if (IS_ERR(bdev))
365 bdev = bl_open_udev_path(v);
366 if (IS_ERR(bdev))
367 return PTR_ERR(bdev);
368 d->bdev = bdev;
369
370 d->len = i_size_read(d->bdev->bd_inode);
371 d->map = bl_map_simple;
372 d->pr_key = v->scsi.pr_key;
373
374 pr_info("pNFS: using block device %s (reservation key 0x%llx)\n",
375 d->bdev->bd_disk->disk_name, d->pr_key);
376
377 ops = d->bdev->bd_disk->fops->pr_ops;
378 if (!ops) {
379 pr_err("pNFS: block device %s does not support reservations.",
380 d->bdev->bd_disk->disk_name);
381 error = -EINVAL;
382 goto out_blkdev_put;
383 }
384
385 error = ops->pr_register(d->bdev, 0, d->pr_key, true);
386 if (error) {
387 pr_err("pNFS: failed to register key for block device %s.",
388 d->bdev->bd_disk->disk_name);
389 goto out_blkdev_put;
390 }
391
392 d->pr_registered = true;
393 return 0;
394
395out_blkdev_put:
396 blkdev_put(d->bdev, FMODE_READ | FMODE_WRITE);
397 return error;
398}
399
400static int
401bl_parse_slice(struct nfs_server *server, struct pnfs_block_dev *d,
402 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
403{
404 struct pnfs_block_volume *v = &volumes[idx];
405 int ret;
406
407 ret = bl_parse_deviceid(server, d, volumes, v->slice.volume, gfp_mask);
408 if (ret)
409 return ret;
410
411 d->disk_offset = v->slice.start;
412 d->len = v->slice.len;
413 return 0;
414}
415
416static int
417bl_parse_concat(struct nfs_server *server, struct pnfs_block_dev *d,
418 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
419{
420 struct pnfs_block_volume *v = &volumes[idx];
421 u64 len = 0;
422 int ret, i;
423
424 d->children = kcalloc(v->concat.volumes_count,
425 sizeof(struct pnfs_block_dev), GFP_KERNEL);
426 if (!d->children)
427 return -ENOMEM;
428
429 for (i = 0; i < v->concat.volumes_count; i++) {
430 ret = bl_parse_deviceid(server, &d->children[i],
431 volumes, v->concat.volumes[i], gfp_mask);
432 if (ret)
433 return ret;
434
435 d->nr_children++;
436 d->children[i].start += len;
437 len += d->children[i].len;
438 }
439
440 d->len = len;
441 d->map = bl_map_concat;
442 return 0;
443}
444
445static int
446bl_parse_stripe(struct nfs_server *server, struct pnfs_block_dev *d,
447 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
448{
449 struct pnfs_block_volume *v = &volumes[idx];
450 u64 len = 0;
451 int ret, i;
452
453 d->children = kcalloc(v->stripe.volumes_count,
454 sizeof(struct pnfs_block_dev), GFP_KERNEL);
455 if (!d->children)
456 return -ENOMEM;
457
458 for (i = 0; i < v->stripe.volumes_count; i++) {
459 ret = bl_parse_deviceid(server, &d->children[i],
460 volumes, v->stripe.volumes[i], gfp_mask);
461 if (ret)
462 return ret;
463
464 d->nr_children++;
465 len += d->children[i].len;
466 }
467
468 d->len = len;
469 d->chunk_size = v->stripe.chunk_size;
470 d->map = bl_map_stripe;
471 return 0;
472}
473
474static int
475bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
476 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
477{
478 switch (volumes[idx].type) {
479 case PNFS_BLOCK_VOLUME_SIMPLE:
480 return bl_parse_simple(server, d, volumes, idx, gfp_mask);
481 case PNFS_BLOCK_VOLUME_SLICE:
482 return bl_parse_slice(server, d, volumes, idx, gfp_mask);
483 case PNFS_BLOCK_VOLUME_CONCAT:
484 return bl_parse_concat(server, d, volumes, idx, gfp_mask);
485 case PNFS_BLOCK_VOLUME_STRIPE:
486 return bl_parse_stripe(server, d, volumes, idx, gfp_mask);
487 case PNFS_BLOCK_VOLUME_SCSI:
488 return bl_parse_scsi(server, d, volumes, idx, gfp_mask);
489 default:
490 dprintk("unsupported volume type: %d\n", volumes[idx].type);
491 return -EIO;
492 }
493}
494
495struct nfs4_deviceid_node *
496bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
497 gfp_t gfp_mask)
498{
499 struct nfs4_deviceid_node *node = NULL;
500 struct pnfs_block_volume *volumes;
501 struct pnfs_block_dev *top;
502 struct xdr_stream xdr;
503 struct xdr_buf buf;
504 struct page *scratch;
505 int nr_volumes, ret, i;
506 __be32 *p;
507
508 scratch = alloc_page(gfp_mask);
509 if (!scratch)
510 goto out;
511
512 xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen);
513 xdr_set_scratch_page(&xdr, scratch);
514
515 p = xdr_inline_decode(&xdr, sizeof(__be32));
516 if (!p)
517 goto out_free_scratch;
518 nr_volumes = be32_to_cpup(p++);
519
520 volumes = kcalloc(nr_volumes, sizeof(struct pnfs_block_volume),
521 gfp_mask);
522 if (!volumes)
523 goto out_free_scratch;
524
525 for (i = 0; i < nr_volumes; i++) {
526 ret = nfs4_block_decode_volume(&xdr, &volumes[i]);
527 if (ret < 0)
528 goto out_free_volumes;
529 }
530
531 top = kzalloc(sizeof(*top), gfp_mask);
532 if (!top)
533 goto out_free_volumes;
534
535 ret = bl_parse_deviceid(server, top, volumes, nr_volumes - 1, gfp_mask);
536
537 node = &top->node;
538 nfs4_init_deviceid_node(node, server, &pdev->dev_id);
539 if (ret)
540 nfs4_mark_deviceid_unavailable(node);
541
542out_free_volumes:
543 kfree(volumes);
544out_free_scratch:
545 __free_page(scratch);
546out:
547 return node;
548}