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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5c83746a | 2 | /* |
d9186c03 | 3 | * Copyright (c) 2014-2016 Christoph Hellwig. |
5c83746a CH |
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> | |
d9186c03 | 10 | #include <linux/pr.h> |
5c83746a CH |
11 | |
12 | #include "blocklayout.h" | |
13 | ||
14 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD | |
15 | ||
16 | static void | |
17 | bl_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 { | |
d9186c03 CH |
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 | ||
5c83746a | 37 | if (dev->bdev) |
513d6d7a | 38 | blkdev_put(dev->bdev, FMODE_READ | FMODE_WRITE); |
5c83746a CH |
39 | } |
40 | } | |
41 | ||
42 | void | |
43 | bl_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); | |
84a80f62 | 49 | kfree_rcu(dev, node.rcu); |
5c83746a CH |
50 | } |
51 | ||
52 | static int | |
53 | nfs4_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++); | |
c77efc1e KM |
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); | |
5c83746a CH |
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++); | |
2bd3c63a CH |
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 | } | |
5c83746a CH |
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 | ||
ecc2b88c KM |
93 | b->simple.len += 8 + 4 + \ |
94 | (XDR_QUADLEN(b->simple.sigs[i].sig_len) << 2); | |
5c83746a CH |
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; | |
c77efc1e | 109 | |
5c83746a | 110 | b->concat.volumes_count = be32_to_cpup(p++); |
c77efc1e KM |
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 | } | |
5c83746a CH |
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; | |
c77efc1e | 126 | |
5c83746a CH |
127 | p = xdr_decode_hyper(p, &b->stripe.chunk_size); |
128 | b->stripe.volumes_count = be32_to_cpup(p++); | |
c77efc1e KM |
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 | } | |
5c83746a CH |
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; | |
d9186c03 CH |
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; | |
5c83746a CH |
158 | default: |
159 | dprintk("unknown volume type!\n"); | |
160 | return -EIO; | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | static 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 | ||
176 | static 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 | ||
196 | static 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; | |
5466112f TM |
200 | u64 chunk; |
201 | u32 chunk_idx; | |
5c83746a CH |
202 | u64 disk_offset; |
203 | ||
5466112f TM |
204 | chunk = div_u64(offset, dev->chunk_size); |
205 | div_u64_rem(chunk, dev->nr_children, &chunk_idx); | |
206 | ||
5c83746a CH |
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 */ | |
5466112f | 218 | disk_offset = div_u64(offset, dev->nr_children); |
5c83746a CH |
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 | ||
229 | static int | |
230 | bl_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 | ||
234 | static int | |
235 | bl_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]; | |
297fae4d | 239 | struct block_device *bdev; |
5c83746a CH |
240 | dev_t dev; |
241 | ||
242 | dev = bl_resolve_deviceid(server, v, gfp_mask); | |
243 | if (!dev) | |
244 | return -EIO; | |
245 | ||
297fae4d AS |
246 | bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL); |
247 | if (IS_ERR(bdev)) { | |
5c83746a | 248 | printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n", |
297fae4d AS |
249 | MAJOR(dev), MINOR(dev), PTR_ERR(bdev)); |
250 | return PTR_ERR(bdev); | |
5c83746a | 251 | } |
297fae4d | 252 | d->bdev = bdev; |
5c83746a CH |
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 | ||
d9186c03 CH |
263 | static bool |
264 | bl_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 | ||
d702d41e CH |
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 | */ | |
308 | static struct block_device * | |
309 | bl_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 | ||
11487ddb CH |
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 | */ | |
333 | static struct block_device * | |
334 | bl_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 | ||
d9186c03 CH |
351 | static int |
352 | bl_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]; | |
297fae4d | 356 | struct block_device *bdev; |
d9186c03 | 357 | const struct pr_ops *ops; |
d9186c03 CH |
358 | int error; |
359 | ||
360 | if (!bl_validate_designator(v)) | |
361 | return -EINVAL; | |
362 | ||
297fae4d AS |
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; | |
d9186c03 CH |
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 | ||
395 | out_blkdev_put: | |
0173ca05 | 396 | blkdev_put(d->bdev, FMODE_READ | FMODE_WRITE); |
d9186c03 CH |
397 | return error; |
398 | } | |
399 | ||
5c83746a CH |
400 | static int |
401 | bl_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 | ||
416 | static int | |
417 | bl_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 | ||
445 | static int | |
446 | bl_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 | ||
474 | static int | |
475 | bl_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); | |
d9186c03 CH |
487 | case PNFS_BLOCK_VOLUME_SCSI: |
488 | return bl_parse_scsi(server, d, volumes, idx, gfp_mask); | |
5c83746a CH |
489 | default: |
490 | dprintk("unsupported volume type: %d\n", volumes[idx].type); | |
491 | return -EIO; | |
492 | } | |
493 | } | |
494 | ||
495 | struct nfs4_deviceid_node * | |
496 | bl_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 | if (ret) { | |
537 | bl_free_device(top); | |
538 | kfree(top); | |
539 | goto out_free_volumes; | |
540 | } | |
541 | ||
542 | node = &top->node; | |
543 | nfs4_init_deviceid_node(node, server, &pdev->dev_id); | |
544 | ||
545 | out_free_volumes: | |
546 | kfree(volumes); | |
547 | out_free_scratch: | |
548 | __free_page(scratch); | |
549 | out: | |
550 | return node; | |
551 | } |