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, NULL); 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, BLK_OPEN_READ | BLK_OPEN_WRITE, NULL, 247 NULL); 248 if (IS_ERR(bdev)) { 249 printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n", 250 MAJOR(dev), MINOR(dev), PTR_ERR(bdev)); 251 return PTR_ERR(bdev); 252 } 253 d->bdev = bdev; 254 255 256 d->len = bdev_nr_bytes(d->bdev); 257 d->map = bl_map_simple; 258 259 printk(KERN_INFO "pNFS: using block device %s\n", 260 d->bdev->bd_disk->disk_name); 261 return 0; 262} 263 264static bool 265bl_validate_designator(struct pnfs_block_volume *v) 266{ 267 switch (v->scsi.designator_type) { 268 case PS_DESIGNATOR_EUI64: 269 if (v->scsi.code_set != PS_CODE_SET_BINARY) 270 return false; 271 272 if (v->scsi.designator_len != 8 && 273 v->scsi.designator_len != 10 && 274 v->scsi.designator_len != 16) 275 return false; 276 277 return true; 278 case PS_DESIGNATOR_NAA: 279 if (v->scsi.code_set != PS_CODE_SET_BINARY) 280 return false; 281 282 if (v->scsi.designator_len != 8 && 283 v->scsi.designator_len != 16) 284 return false; 285 286 return true; 287 case PS_DESIGNATOR_T10: 288 case PS_DESIGNATOR_NAME: 289 pr_err("pNFS: unsupported designator " 290 "(code set %d, type %d, len %d.\n", 291 v->scsi.code_set, 292 v->scsi.designator_type, 293 v->scsi.designator_len); 294 return false; 295 default: 296 pr_err("pNFS: invalid designator " 297 "(code set %d, type %d, len %d.\n", 298 v->scsi.code_set, 299 v->scsi.designator_type, 300 v->scsi.designator_len); 301 return false; 302 } 303} 304 305static struct block_device * 306bl_open_path(struct pnfs_block_volume *v, const char *prefix) 307{ 308 struct block_device *bdev; 309 const char *devname; 310 311 devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/%s%*phN", 312 prefix, v->scsi.designator_len, v->scsi.designator); 313 if (!devname) 314 return ERR_PTR(-ENOMEM); 315 316 bdev = blkdev_get_by_path(devname, BLK_OPEN_READ | BLK_OPEN_WRITE, NULL, 317 NULL); 318 if (IS_ERR(bdev)) { 319 pr_warn("pNFS: failed to open device %s (%ld)\n", 320 devname, PTR_ERR(bdev)); 321 } 322 323 kfree(devname); 324 return bdev; 325} 326 327static int 328bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d, 329 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask) 330{ 331 struct pnfs_block_volume *v = &volumes[idx]; 332 struct block_device *bdev; 333 const struct pr_ops *ops; 334 int error; 335 336 if (!bl_validate_designator(v)) 337 return -EINVAL; 338 339 /* 340 * Try to open the RH/Fedora specific dm-mpath udev path first, as the 341 * wwn- links will only point to the first discovered SCSI device there. 342 * On other distributions like Debian, the default SCSI by-id path will 343 * point to the dm-multipath device if one exists. 344 */ 345 bdev = bl_open_path(v, "dm-uuid-mpath-0x"); 346 if (IS_ERR(bdev)) 347 bdev = bl_open_path(v, "wwn-0x"); 348 if (IS_ERR(bdev)) 349 return PTR_ERR(bdev); 350 d->bdev = bdev; 351 352 d->len = bdev_nr_bytes(d->bdev); 353 d->map = bl_map_simple; 354 d->pr_key = v->scsi.pr_key; 355 356 pr_info("pNFS: using block device %s (reservation key 0x%llx)\n", 357 d->bdev->bd_disk->disk_name, d->pr_key); 358 359 ops = d->bdev->bd_disk->fops->pr_ops; 360 if (!ops) { 361 pr_err("pNFS: block device %s does not support reservations.", 362 d->bdev->bd_disk->disk_name); 363 error = -EINVAL; 364 goto out_blkdev_put; 365 } 366 367 error = ops->pr_register(d->bdev, 0, d->pr_key, true); 368 if (error) { 369 pr_err("pNFS: failed to register key for block device %s.", 370 d->bdev->bd_disk->disk_name); 371 goto out_blkdev_put; 372 } 373 374 d->pr_registered = true; 375 return 0; 376 377out_blkdev_put: 378 blkdev_put(d->bdev, NULL); 379 return error; 380} 381 382static int 383bl_parse_slice(struct nfs_server *server, struct pnfs_block_dev *d, 384 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask) 385{ 386 struct pnfs_block_volume *v = &volumes[idx]; 387 int ret; 388 389 ret = bl_parse_deviceid(server, d, volumes, v->slice.volume, gfp_mask); 390 if (ret) 391 return ret; 392 393 d->disk_offset = v->slice.start; 394 d->len = v->slice.len; 395 return 0; 396} 397 398static int 399bl_parse_concat(struct nfs_server *server, struct pnfs_block_dev *d, 400 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask) 401{ 402 struct pnfs_block_volume *v = &volumes[idx]; 403 u64 len = 0; 404 int ret, i; 405 406 d->children = kcalloc(v->concat.volumes_count, 407 sizeof(struct pnfs_block_dev), gfp_mask); 408 if (!d->children) 409 return -ENOMEM; 410 411 for (i = 0; i < v->concat.volumes_count; i++) { 412 ret = bl_parse_deviceid(server, &d->children[i], 413 volumes, v->concat.volumes[i], gfp_mask); 414 if (ret) 415 return ret; 416 417 d->nr_children++; 418 d->children[i].start += len; 419 len += d->children[i].len; 420 } 421 422 d->len = len; 423 d->map = bl_map_concat; 424 return 0; 425} 426 427static int 428bl_parse_stripe(struct nfs_server *server, struct pnfs_block_dev *d, 429 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask) 430{ 431 struct pnfs_block_volume *v = &volumes[idx]; 432 u64 len = 0; 433 int ret, i; 434 435 d->children = kcalloc(v->stripe.volumes_count, 436 sizeof(struct pnfs_block_dev), gfp_mask); 437 if (!d->children) 438 return -ENOMEM; 439 440 for (i = 0; i < v->stripe.volumes_count; i++) { 441 ret = bl_parse_deviceid(server, &d->children[i], 442 volumes, v->stripe.volumes[i], gfp_mask); 443 if (ret) 444 return ret; 445 446 d->nr_children++; 447 len += d->children[i].len; 448 } 449 450 d->len = len; 451 d->chunk_size = v->stripe.chunk_size; 452 d->map = bl_map_stripe; 453 return 0; 454} 455 456static int 457bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d, 458 struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask) 459{ 460 switch (volumes[idx].type) { 461 case PNFS_BLOCK_VOLUME_SIMPLE: 462 return bl_parse_simple(server, d, volumes, idx, gfp_mask); 463 case PNFS_BLOCK_VOLUME_SLICE: 464 return bl_parse_slice(server, d, volumes, idx, gfp_mask); 465 case PNFS_BLOCK_VOLUME_CONCAT: 466 return bl_parse_concat(server, d, volumes, idx, gfp_mask); 467 case PNFS_BLOCK_VOLUME_STRIPE: 468 return bl_parse_stripe(server, d, volumes, idx, gfp_mask); 469 case PNFS_BLOCK_VOLUME_SCSI: 470 return bl_parse_scsi(server, d, volumes, idx, gfp_mask); 471 default: 472 dprintk("unsupported volume type: %d\n", volumes[idx].type); 473 return -EIO; 474 } 475} 476 477struct nfs4_deviceid_node * 478bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev, 479 gfp_t gfp_mask) 480{ 481 struct nfs4_deviceid_node *node = NULL; 482 struct pnfs_block_volume *volumes; 483 struct pnfs_block_dev *top; 484 struct xdr_stream xdr; 485 struct xdr_buf buf; 486 struct page *scratch; 487 int nr_volumes, ret, i; 488 __be32 *p; 489 490 scratch = alloc_page(gfp_mask); 491 if (!scratch) 492 goto out; 493 494 xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen); 495 xdr_set_scratch_page(&xdr, scratch); 496 497 p = xdr_inline_decode(&xdr, sizeof(__be32)); 498 if (!p) 499 goto out_free_scratch; 500 nr_volumes = be32_to_cpup(p++); 501 502 volumes = kcalloc(nr_volumes, sizeof(struct pnfs_block_volume), 503 gfp_mask); 504 if (!volumes) 505 goto out_free_scratch; 506 507 for (i = 0; i < nr_volumes; i++) { 508 ret = nfs4_block_decode_volume(&xdr, &volumes[i]); 509 if (ret < 0) 510 goto out_free_volumes; 511 } 512 513 top = kzalloc(sizeof(*top), gfp_mask); 514 if (!top) 515 goto out_free_volumes; 516 517 ret = bl_parse_deviceid(server, top, volumes, nr_volumes - 1, gfp_mask); 518 519 node = &top->node; 520 nfs4_init_deviceid_node(node, server, &pdev->dev_id); 521 if (ret) 522 nfs4_mark_deviceid_unavailable(node); 523 524out_free_volumes: 525 kfree(volumes); 526out_free_scratch: 527 __free_page(scratch); 528out: 529 return node; 530} 531