fs/nfs/blocklayout/dev.c

   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 }