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TOMOYO Linux Cross Reference
Linux/fs/nfs/blocklayout/dev.c

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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 
 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 {
 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 
 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);
 49         kfree_rcu(dev, node.rcu);
 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++);
 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 
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;
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 
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];
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 
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 
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 
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 
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];
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 
395 out_blkdev_put:
396         blkdev_put(d->bdev, FMODE_READ | FMODE_WRITE);
397         return error;
398 }
399 
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);
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 
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 
537         node = &top->node;
538         nfs4_init_deviceid_node(node, server, &pdev->dev_id);
539         if (ret)
540                 nfs4_mark_deviceid_unavailable(node);
541 
542 out_free_volumes:
543         kfree(volumes);
544 out_free_scratch:
545         __free_page(scratch);
546 out:
547         return node;
548 }
549 

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