drivers/nvdimm/label.c

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This source file includes following definitions.
best_seq
sizeof_namespace_label
__sizeof_namespace_index
__nvdimm_num_label_slots
nvdimm_num_label_slots
sizeof_namespace_index
__nd_label_validate
nd_label_validate
nd_label_copy
nd_label_base
to_slot
to_label
preamble_index
nd_label_gen_id
preamble_current
preamble_next
slot_valid
nd_label_reserve_dpa
nd_label_data_init
nd_label_active_count
nd_label_active
nd_label_alloc_slot
nd_label_free_slot
nd_label_nfree
nd_label_write_index
nd_label_offset
to_nvdimm_cclass
to_abstraction_guid
reap_victim
__pmem_label_update
is_old_resource
to_resource
__blk_label_update
init_labels
del_labels
nd_pmem_namespace_label_update
nd_blk_namespace_label_update
nd_label_init
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   4  */
   5 #include <linux/device.h>
   6 #include <linux/ndctl.h>
   7 #include <linux/uuid.h>
   8 #include <linux/slab.h>
   9 #include <linux/io.h>
  10 #include <linux/nd.h>
  11 #include "nd-core.h"
  12 #include "label.h"
  13 #include "nd.h"
  14 
  15 static guid_t nvdimm_btt_guid;
  16 static guid_t nvdimm_btt2_guid;
  17 static guid_t nvdimm_pfn_guid;
  18 static guid_t nvdimm_dax_guid;
  19 
  20 static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
  21 
  22 static u32 best_seq(u32 a, u32 b)
  23 {
  24         a &= NSINDEX_SEQ_MASK;
  25         b &= NSINDEX_SEQ_MASK;
  26 
  27         if (a == 0 || a == b)
  28                 return b;
  29         else if (b == 0)
  30                 return a;
  31         else if (nd_inc_seq(a) == b)
  32                 return b;
  33         else
  34                 return a;
  35 }
  36 
  37 unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd)
  38 {
  39         return ndd->nslabel_size;
  40 }
  41 
  42 static size_t __sizeof_namespace_index(u32 nslot)
  43 {
  44         return ALIGN(sizeof(struct nd_namespace_index) + DIV_ROUND_UP(nslot, 8),
  45                         NSINDEX_ALIGN);
  46 }
  47 
  48 static int __nvdimm_num_label_slots(struct nvdimm_drvdata *ndd,
  49                 size_t index_size)
  50 {
  51         return (ndd->nsarea.config_size - index_size * 2) /
  52                         sizeof_namespace_label(ndd);
  53 }
  54 
  55 int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
  56 {
  57         u32 tmp_nslot, n;
  58 
  59         tmp_nslot = ndd->nsarea.config_size / sizeof_namespace_label(ndd);
  60         n = __sizeof_namespace_index(tmp_nslot) / NSINDEX_ALIGN;
  61 
  62         return __nvdimm_num_label_slots(ndd, NSINDEX_ALIGN * n);
  63 }
  64 
  65 size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
  66 {
  67         u32 nslot, space, size;
  68 
  69         /*
  70          * Per UEFI 2.7, the minimum size of the Label Storage Area is large
  71          * enough to hold 2 index blocks and 2 labels.  The minimum index
  72          * block size is 256 bytes. The label size is 128 for namespaces
  73          * prior to version 1.2 and at minimum 256 for version 1.2 and later.
  74          */
  75         nslot = nvdimm_num_label_slots(ndd);
  76         space = ndd->nsarea.config_size - nslot * sizeof_namespace_label(ndd);
  77         size = __sizeof_namespace_index(nslot) * 2;
  78         if (size <= space && nslot >= 2)
  79                 return size / 2;
  80 
  81         dev_err(ndd->dev, "label area (%d) too small to host (%d byte) labels\n",
  82                         ndd->nsarea.config_size, sizeof_namespace_label(ndd));
  83         return 0;
  84 }
  85 
  86 static int __nd_label_validate(struct nvdimm_drvdata *ndd)
  87 {
  88         /*
  89          * On media label format consists of two index blocks followed
  90          * by an array of labels.  None of these structures are ever
  91          * updated in place.  A sequence number tracks the current
  92          * active index and the next one to write, while labels are
  93          * written to free slots.
  94          *
  95          *     +------------+
  96          *     |            |
  97          *     |  nsindex0  |
  98          *     |            |
  99          *     +------------+
 100          *     |            |
 101          *     |  nsindex1  |
 102          *     |            |
 103          *     +------------+
 104          *     |   label0   |
 105          *     +------------+
 106          *     |   label1   |
 107          *     +------------+
 108          *     |            |
 109          *      ....nslot...
 110          *     |            |
 111          *     +------------+
 112          *     |   labelN   |
 113          *     +------------+
 114          */
 115         struct nd_namespace_index *nsindex[] = {
 116                 to_namespace_index(ndd, 0),
 117                 to_namespace_index(ndd, 1),
 118         };
 119         const int num_index = ARRAY_SIZE(nsindex);
 120         struct device *dev = ndd->dev;
 121         bool valid[2] = { 0 };
 122         int i, num_valid = 0;
 123         u32 seq;
 124 
 125         for (i = 0; i < num_index; i++) {
 126                 u32 nslot;
 127                 u8 sig[NSINDEX_SIG_LEN];
 128                 u64 sum_save, sum, size;
 129                 unsigned int version, labelsize;
 130 
 131                 memcpy(sig, nsindex[i]->sig, NSINDEX_SIG_LEN);
 132                 if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) {
 133                         dev_dbg(dev, "nsindex%d signature invalid\n", i);
 134                         continue;
 135                 }
 136 
 137                 /* label sizes larger than 128 arrived with v1.2 */
 138                 version = __le16_to_cpu(nsindex[i]->major) * 100
 139                         + __le16_to_cpu(nsindex[i]->minor);
 140                 if (version >= 102)
 141                         labelsize = 1 << (7 + nsindex[i]->labelsize);
 142                 else
 143                         labelsize = 128;
 144 
 145                 if (labelsize != sizeof_namespace_label(ndd)) {
 146                         dev_dbg(dev, "nsindex%d labelsize %d invalid\n",
 147                                         i, nsindex[i]->labelsize);
 148                         continue;
 149                 }
 150 
 151                 sum_save = __le64_to_cpu(nsindex[i]->checksum);
 152                 nsindex[i]->checksum = __cpu_to_le64(0);
 153                 sum = nd_fletcher64(nsindex[i], sizeof_namespace_index(ndd), 1);
 154                 nsindex[i]->checksum = __cpu_to_le64(sum_save);
 155                 if (sum != sum_save) {
 156                         dev_dbg(dev, "nsindex%d checksum invalid\n", i);
 157                         continue;
 158                 }
 159 
 160                 seq = __le32_to_cpu(nsindex[i]->seq);
 161                 if ((seq & NSINDEX_SEQ_MASK) == 0) {
 162                         dev_dbg(dev, "nsindex%d sequence: %#x invalid\n", i, seq);
 163                         continue;
 164                 }
 165 
 166                 /* sanity check the index against expected values */
 167                 if (__le64_to_cpu(nsindex[i]->myoff)
 168                                 != i * sizeof_namespace_index(ndd)) {
 169                         dev_dbg(dev, "nsindex%d myoff: %#llx invalid\n",
 170                                         i, (unsigned long long)
 171                                         __le64_to_cpu(nsindex[i]->myoff));
 172                         continue;
 173                 }
 174                 if (__le64_to_cpu(nsindex[i]->otheroff)
 175                                 != (!i) * sizeof_namespace_index(ndd)) {
 176                         dev_dbg(dev, "nsindex%d otheroff: %#llx invalid\n",
 177                                         i, (unsigned long long)
 178                                         __le64_to_cpu(nsindex[i]->otheroff));
 179                         continue;
 180                 }
 181                 if (__le64_to_cpu(nsindex[i]->labeloff)
 182                                 != 2 * sizeof_namespace_index(ndd)) {
 183                         dev_dbg(dev, "nsindex%d labeloff: %#llx invalid\n",
 184                                         i, (unsigned long long)
 185                                         __le64_to_cpu(nsindex[i]->labeloff));
 186                         continue;
 187                 }
 188 
 189                 size = __le64_to_cpu(nsindex[i]->mysize);
 190                 if (size > sizeof_namespace_index(ndd)
 191                                 || size < sizeof(struct nd_namespace_index)) {
 192                         dev_dbg(dev, "nsindex%d mysize: %#llx invalid\n", i, size);
 193                         continue;
 194                 }
 195 
 196                 nslot = __le32_to_cpu(nsindex[i]->nslot);
 197                 if (nslot * sizeof_namespace_label(ndd)
 198                                 + 2 * sizeof_namespace_index(ndd)
 199                                 > ndd->nsarea.config_size) {
 200                         dev_dbg(dev, "nsindex%d nslot: %u invalid, config_size: %#x\n",
 201                                         i, nslot, ndd->nsarea.config_size);
 202                         continue;
 203                 }
 204                 valid[i] = true;
 205                 num_valid++;
 206         }
 207 
 208         switch (num_valid) {
 209         case 0:
 210                 break;
 211         case 1:
 212                 for (i = 0; i < num_index; i++)
 213                         if (valid[i])
 214                                 return i;
 215                 /* can't have num_valid > 0 but valid[] = { false, false } */
 216                 WARN_ON(1);
 217                 break;
 218         default:
 219                 /* pick the best index... */
 220                 seq = best_seq(__le32_to_cpu(nsindex[0]->seq),
 221                                 __le32_to_cpu(nsindex[1]->seq));
 222                 if (seq == (__le32_to_cpu(nsindex[1]->seq) & NSINDEX_SEQ_MASK))
 223                         return 1;
 224                 else
 225                         return 0;
 226                 break;
 227         }
 228 
 229         return -1;
 230 }
 231 
 232 static int nd_label_validate(struct nvdimm_drvdata *ndd)
 233 {
 234         /*
 235          * In order to probe for and validate namespace index blocks we
 236          * need to know the size of the labels, and we can't trust the
 237          * size of the labels until we validate the index blocks.
 238          * Resolve this dependency loop by probing for known label
 239          * sizes, but default to v1.2 256-byte namespace labels if
 240          * discovery fails.
 241          */
 242         int label_size[] = { 128, 256 };
 243         int i, rc;
 244 
 245         for (i = 0; i < ARRAY_SIZE(label_size); i++) {
 246                 ndd->nslabel_size = label_size[i];
 247                 rc = __nd_label_validate(ndd);
 248                 if (rc >= 0)
 249                         return rc;
 250         }
 251 
 252         return -1;
 253 }
 254 
 255 static void nd_label_copy(struct nvdimm_drvdata *ndd,
 256                           struct nd_namespace_index *dst,
 257                           struct nd_namespace_index *src)
 258 {
 259         /* just exit if either destination or source is NULL */
 260         if (!dst || !src)
 261                 return;
 262 
 263         memcpy(dst, src, sizeof_namespace_index(ndd));
 264 }
 265 
 266 static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd)
 267 {
 268         void *base = to_namespace_index(ndd, 0);
 269 
 270         return base + 2 * sizeof_namespace_index(ndd);
 271 }
 272 
 273 static int to_slot(struct nvdimm_drvdata *ndd,
 274                 struct nd_namespace_label *nd_label)
 275 {
 276         unsigned long label, base;
 277 
 278         label = (unsigned long) nd_label;
 279         base = (unsigned long) nd_label_base(ndd);
 280 
 281         return (label - base) / sizeof_namespace_label(ndd);
 282 }
 283 
 284 static struct nd_namespace_label *to_label(struct nvdimm_drvdata *ndd, int slot)
 285 {
 286         unsigned long label, base;
 287 
 288         base = (unsigned long) nd_label_base(ndd);
 289         label = base + sizeof_namespace_label(ndd) * slot;
 290 
 291         return (struct nd_namespace_label *) label;
 292 }
 293 
 294 #define for_each_clear_bit_le(bit, addr, size) \
 295         for ((bit) = find_next_zero_bit_le((addr), (size), 0);  \
 296              (bit) < (size);                                    \
 297              (bit) = find_next_zero_bit_le((addr), (size), (bit) + 1))
 298 
 299 /**
 300  * preamble_index - common variable initialization for nd_label_* routines
 301  * @ndd: dimm container for the relevant label set
 302  * @idx: namespace_index index
 303  * @nsindex_out: on return set to the currently active namespace index
 304  * @free: on return set to the free label bitmap in the index
 305  * @nslot: on return set to the number of slots in the label space
 306  */
 307 static bool preamble_index(struct nvdimm_drvdata *ndd, int idx,
 308                 struct nd_namespace_index **nsindex_out,
 309                 unsigned long **free, u32 *nslot)
 310 {
 311         struct nd_namespace_index *nsindex;
 312 
 313         nsindex = to_namespace_index(ndd, idx);
 314         if (nsindex == NULL)
 315                 return false;
 316 
 317         *free = (unsigned long *) nsindex->free;
 318         *nslot = __le32_to_cpu(nsindex->nslot);
 319         *nsindex_out = nsindex;
 320 
 321         return true;
 322 }
 323 
 324 char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags)
 325 {
 326         if (!label_id || !uuid)
 327                 return NULL;
 328         snprintf(label_id->id, ND_LABEL_ID_SIZE, "%s-%pUb",
 329                         flags & NSLABEL_FLAG_LOCAL ? "blk" : "pmem", uuid);
 330         return label_id->id;
 331 }
 332 
 333 static bool preamble_current(struct nvdimm_drvdata *ndd,
 334                 struct nd_namespace_index **nsindex,
 335                 unsigned long **free, u32 *nslot)
 336 {
 337         return preamble_index(ndd, ndd->ns_current, nsindex,
 338                         free, nslot);
 339 }
 340 
 341 static bool preamble_next(struct nvdimm_drvdata *ndd,
 342                 struct nd_namespace_index **nsindex,
 343                 unsigned long **free, u32 *nslot)
 344 {
 345         return preamble_index(ndd, ndd->ns_next, nsindex,
 346                         free, nslot);
 347 }
 348 
 349 static bool slot_valid(struct nvdimm_drvdata *ndd,
 350                 struct nd_namespace_label *nd_label, u32 slot)
 351 {
 352         /* check that we are written where we expect to be written */
 353         if (slot != __le32_to_cpu(nd_label->slot))
 354                 return false;
 355 
 356         /* check checksum */
 357         if (namespace_label_has(ndd, checksum)) {
 358                 u64 sum, sum_save;
 359 
 360                 sum_save = __le64_to_cpu(nd_label->checksum);
 361                 nd_label->checksum = __cpu_to_le64(0);
 362                 sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
 363                 nd_label->checksum = __cpu_to_le64(sum_save);
 364                 if (sum != sum_save) {
 365                         dev_dbg(ndd->dev, "fail checksum. slot: %d expect: %#llx\n",
 366                                 slot, sum);
 367                         return false;
 368                 }
 369         }
 370 
 371         return true;
 372 }
 373 
 374 int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
 375 {
 376         struct nd_namespace_index *nsindex;
 377         unsigned long *free;
 378         u32 nslot, slot;
 379 
 380         if (!preamble_current(ndd, &nsindex, &free, &nslot))
 381                 return 0; /* no label, nothing to reserve */
 382 
 383         for_each_clear_bit_le(slot, free, nslot) {
 384                 struct nvdimm *nvdimm = to_nvdimm(ndd->dev);
 385                 struct nd_namespace_label *nd_label;
 386                 struct nd_region *nd_region = NULL;
 387                 u8 label_uuid[NSLABEL_UUID_LEN];
 388                 struct nd_label_id label_id;
 389                 struct resource *res;
 390                 u32 flags;
 391 
 392                 nd_label = to_label(ndd, slot);
 393 
 394                 if (!slot_valid(ndd, nd_label, slot))
 395                         continue;
 396 
 397                 memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
 398                 flags = __le32_to_cpu(nd_label->flags);
 399                 if (test_bit(NDD_NOBLK, &nvdimm->flags))
 400                         flags &= ~NSLABEL_FLAG_LOCAL;
 401                 nd_label_gen_id(&label_id, label_uuid, flags);
 402                 res = nvdimm_allocate_dpa(ndd, &label_id,
 403                                 __le64_to_cpu(nd_label->dpa),
 404                                 __le64_to_cpu(nd_label->rawsize));
 405                 nd_dbg_dpa(nd_region, ndd, res, "reserve\n");
 406                 if (!res)
 407                         return -EBUSY;
 408         }
 409 
 410         return 0;
 411 }
 412 
 413 int nd_label_data_init(struct nvdimm_drvdata *ndd)
 414 {
 415         size_t config_size, read_size, max_xfer, offset;
 416         struct nd_namespace_index *nsindex;
 417         unsigned int i;
 418         int rc = 0;
 419         u32 nslot;
 420 
 421         if (ndd->data)
 422                 return 0;
 423 
 424         if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0) {
 425                 dev_dbg(ndd->dev, "failed to init config data area: (%u:%u)\n",
 426                         ndd->nsarea.max_xfer, ndd->nsarea.config_size);
 427                 return -ENXIO;
 428         }
 429 
 430         /*
 431          * We need to determine the maximum index area as this is the section
 432          * we must read and validate before we can start processing labels.
 433          *
 434          * If the area is too small to contain the two indexes and 2 labels
 435          * then we abort.
 436          *
 437          * Start at a label size of 128 as this should result in the largest
 438          * possible namespace index size.
 439          */
 440         ndd->nslabel_size = 128;
 441         read_size = sizeof_namespace_index(ndd) * 2;
 442         if (!read_size)
 443                 return -ENXIO;
 444 
 445         /* Allocate config data */
 446         config_size = ndd->nsarea.config_size;
 447         ndd->data = kvzalloc(config_size, GFP_KERNEL);
 448         if (!ndd->data)
 449                 return -ENOMEM;
 450 
 451         /*
 452          * We want to guarantee as few reads as possible while conserving
 453          * memory. To do that we figure out how much unused space will be left
 454          * in the last read, divide that by the total number of reads it is
 455          * going to take given our maximum transfer size, and then reduce our
 456          * maximum transfer size based on that result.
 457          */
 458         max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size);
 459         if (read_size < max_xfer) {
 460                 /* trim waste */
 461                 max_xfer -= ((max_xfer - 1) - (config_size - 1) % max_xfer) /
 462                             DIV_ROUND_UP(config_size, max_xfer);
 463                 /* make certain we read indexes in exactly 1 read */
 464                 if (max_xfer < read_size)
 465                         max_xfer = read_size;
 466         }
 467 
 468         /* Make our initial read size a multiple of max_xfer size */
 469         read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer,
 470                         config_size);
 471 
 472         /* Read the index data */
 473         rc = nvdimm_get_config_data(ndd, ndd->data, 0, read_size);
 474         if (rc)
 475                 goto out_err;
 476 
 477         /* Validate index data, if not valid assume all labels are invalid */
 478         ndd->ns_current = nd_label_validate(ndd);
 479         if (ndd->ns_current < 0)
 480                 return 0;
 481 
 482         /* Record our index values */
 483         ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
 484 
 485         /* Copy "current" index on top of the "next" index */
 486         nsindex = to_current_namespace_index(ndd);
 487         nd_label_copy(ndd, to_next_namespace_index(ndd), nsindex);
 488 
 489         /* Determine starting offset for label data */
 490         offset = __le64_to_cpu(nsindex->labeloff);
 491         nslot = __le32_to_cpu(nsindex->nslot);
 492 
 493         /* Loop through the free list pulling in any active labels */
 494         for (i = 0; i < nslot; i++, offset += ndd->nslabel_size) {
 495                 size_t label_read_size;
 496 
 497                 /* zero out the unused labels */
 498                 if (test_bit_le(i, nsindex->free)) {
 499                         memset(ndd->data + offset, 0, ndd->nslabel_size);
 500                         continue;
 501                 }
 502 
 503                 /* if we already read past here then just continue */
 504                 if (offset + ndd->nslabel_size <= read_size)
 505                         continue;
 506 
 507                 /* if we haven't read in a while reset our read_size offset */
 508                 if (read_size < offset)
 509                         read_size = offset;
 510 
 511                 /* determine how much more will be read after this next call. */
 512                 label_read_size = offset + ndd->nslabel_size - read_size;
 513                 label_read_size = DIV_ROUND_UP(label_read_size, max_xfer) *
 514                                   max_xfer;
 515 
 516                 /* truncate last read if needed */
 517                 if (read_size + label_read_size > config_size)
 518                         label_read_size = config_size - read_size;
 519 
 520                 /* Read the label data */
 521                 rc = nvdimm_get_config_data(ndd, ndd->data + read_size,
 522                                             read_size, label_read_size);
 523                 if (rc)
 524                         goto out_err;
 525 
 526                 /* push read_size to next read offset */
 527                 read_size += label_read_size;
 528         }
 529 
 530         dev_dbg(ndd->dev, "len: %zu rc: %d\n", offset, rc);
 531 out_err:
 532         return rc;
 533 }
 534 
 535 int nd_label_active_count(struct nvdimm_drvdata *ndd)
 536 {
 537         struct nd_namespace_index *nsindex;
 538         unsigned long *free;
 539         u32 nslot, slot;
 540         int count = 0;
 541 
 542         if (!preamble_current(ndd, &nsindex, &free, &nslot))
 543                 return 0;
 544 
 545         for_each_clear_bit_le(slot, free, nslot) {
 546                 struct nd_namespace_label *nd_label;
 547 
 548                 nd_label = to_label(ndd, slot);
 549 
 550                 if (!slot_valid(ndd, nd_label, slot)) {
 551                         u32 label_slot = __le32_to_cpu(nd_label->slot);
 552                         u64 size = __le64_to_cpu(nd_label->rawsize);
 553                         u64 dpa = __le64_to_cpu(nd_label->dpa);
 554 
 555                         dev_dbg(ndd->dev,
 556                                 "slot%d invalid slot: %d dpa: %llx size: %llx\n",
 557                                         slot, label_slot, dpa, size);
 558                         continue;
 559                 }
 560                 count++;
 561         }
 562         return count;
 563 }
 564 
 565 struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
 566 {
 567         struct nd_namespace_index *nsindex;
 568         unsigned long *free;
 569         u32 nslot, slot;
 570 
 571         if (!preamble_current(ndd, &nsindex, &free, &nslot))
 572                 return NULL;
 573 
 574         for_each_clear_bit_le(slot, free, nslot) {
 575                 struct nd_namespace_label *nd_label;
 576 
 577                 nd_label = to_label(ndd, slot);
 578                 if (!slot_valid(ndd, nd_label, slot))
 579                         continue;
 580 
 581                 if (n-- == 0)
 582                         return to_label(ndd, slot);
 583         }
 584 
 585         return NULL;
 586 }
 587 
 588 u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd)
 589 {
 590         struct nd_namespace_index *nsindex;
 591         unsigned long *free;
 592         u32 nslot, slot;
 593 
 594         if (!preamble_next(ndd, &nsindex, &free, &nslot))
 595                 return UINT_MAX;
 596 
 597         WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
 598 
 599         slot = find_next_bit_le(free, nslot, 0);
 600         if (slot == nslot)
 601                 return UINT_MAX;
 602 
 603         clear_bit_le(slot, free);
 604 
 605         return slot;
 606 }
 607 
 608 bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot)
 609 {
 610         struct nd_namespace_index *nsindex;
 611         unsigned long *free;
 612         u32 nslot;
 613 
 614         if (!preamble_next(ndd, &nsindex, &free, &nslot))
 615                 return false;
 616 
 617         WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
 618 
 619         if (slot < nslot)
 620                 return !test_and_set_bit_le(slot, free);
 621         return false;
 622 }
 623 
 624 u32 nd_label_nfree(struct nvdimm_drvdata *ndd)
 625 {
 626         struct nd_namespace_index *nsindex;
 627         unsigned long *free;
 628         u32 nslot;
 629 
 630         WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
 631 
 632         if (!preamble_next(ndd, &nsindex, &free, &nslot))
 633                 return nvdimm_num_label_slots(ndd);
 634 
 635         return bitmap_weight(free, nslot);
 636 }
 637 
 638 static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq,
 639                 unsigned long flags)
 640 {
 641         struct nd_namespace_index *nsindex;
 642         unsigned long offset;
 643         u64 checksum;
 644         u32 nslot;
 645         int rc;
 646 
 647         nsindex = to_namespace_index(ndd, index);
 648         if (flags & ND_NSINDEX_INIT)
 649                 nslot = nvdimm_num_label_slots(ndd);
 650         else
 651                 nslot = __le32_to_cpu(nsindex->nslot);
 652 
 653         memcpy(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN);
 654         memset(&nsindex->flags, 0, 3);
 655         nsindex->labelsize = sizeof_namespace_label(ndd) >> 8;
 656         nsindex->seq = __cpu_to_le32(seq);
 657         offset = (unsigned long) nsindex
 658                 - (unsigned long) to_namespace_index(ndd, 0);
 659         nsindex->myoff = __cpu_to_le64(offset);
 660         nsindex->mysize = __cpu_to_le64(sizeof_namespace_index(ndd));
 661         offset = (unsigned long) to_namespace_index(ndd,
 662                         nd_label_next_nsindex(index))
 663                 - (unsigned long) to_namespace_index(ndd, 0);
 664         nsindex->otheroff = __cpu_to_le64(offset);
 665         offset = (unsigned long) nd_label_base(ndd)
 666                 - (unsigned long) to_namespace_index(ndd, 0);
 667         nsindex->labeloff = __cpu_to_le64(offset);
 668         nsindex->nslot = __cpu_to_le32(nslot);
 669         nsindex->major = __cpu_to_le16(1);
 670         if (sizeof_namespace_label(ndd) < 256)
 671                 nsindex->minor = __cpu_to_le16(1);
 672         else
 673                 nsindex->minor = __cpu_to_le16(2);
 674         nsindex->checksum = __cpu_to_le64(0);
 675         if (flags & ND_NSINDEX_INIT) {
 676                 unsigned long *free = (unsigned long *) nsindex->free;
 677                 u32 nfree = ALIGN(nslot, BITS_PER_LONG);
 678                 int last_bits, i;
 679 
 680                 memset(nsindex->free, 0xff, nfree / 8);
 681                 for (i = 0, last_bits = nfree - nslot; i < last_bits; i++)
 682                         clear_bit_le(nslot + i, free);
 683         }
 684         checksum = nd_fletcher64(nsindex, sizeof_namespace_index(ndd), 1);
 685         nsindex->checksum = __cpu_to_le64(checksum);
 686         rc = nvdimm_set_config_data(ndd, __le64_to_cpu(nsindex->myoff),
 687                         nsindex, sizeof_namespace_index(ndd));
 688         if (rc < 0)
 689                 return rc;
 690 
 691         if (flags & ND_NSINDEX_INIT)
 692                 return 0;
 693 
 694         /* copy the index we just wrote to the new 'next' */
 695         WARN_ON(index != ndd->ns_next);
 696         nd_label_copy(ndd, to_current_namespace_index(ndd), nsindex);
 697         ndd->ns_current = nd_label_next_nsindex(ndd->ns_current);
 698         ndd->ns_next = nd_label_next_nsindex(ndd->ns_next);
 699         WARN_ON(ndd->ns_current == ndd->ns_next);
 700 
 701         return 0;
 702 }
 703 
 704 static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
 705                 struct nd_namespace_label *nd_label)
 706 {
 707         return (unsigned long) nd_label
 708                 - (unsigned long) to_namespace_index(ndd, 0);
 709 }
 710 
 711 enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid)
 712 {
 713         if (guid_equal(guid, &nvdimm_btt_guid))
 714                 return NVDIMM_CCLASS_BTT;
 715         else if (guid_equal(guid, &nvdimm_btt2_guid))
 716                 return NVDIMM_CCLASS_BTT2;
 717         else if (guid_equal(guid, &nvdimm_pfn_guid))
 718                 return NVDIMM_CCLASS_PFN;
 719         else if (guid_equal(guid, &nvdimm_dax_guid))
 720                 return NVDIMM_CCLASS_DAX;
 721         else if (guid_equal(guid, &guid_null))
 722                 return NVDIMM_CCLASS_NONE;
 723 
 724         return NVDIMM_CCLASS_UNKNOWN;
 725 }
 726 
 727 static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class,
 728         guid_t *target)
 729 {
 730         if (claim_class == NVDIMM_CCLASS_BTT)
 731                 return &nvdimm_btt_guid;
 732         else if (claim_class == NVDIMM_CCLASS_BTT2)
 733                 return &nvdimm_btt2_guid;
 734         else if (claim_class == NVDIMM_CCLASS_PFN)
 735                 return &nvdimm_pfn_guid;
 736         else if (claim_class == NVDIMM_CCLASS_DAX)
 737                 return &nvdimm_dax_guid;
 738         else if (claim_class == NVDIMM_CCLASS_UNKNOWN) {
 739                 /*
 740                  * If we're modifying a namespace for which we don't
 741                  * know the claim_class, don't touch the existing guid.
 742                  */
 743                 return target;
 744         } else
 745                 return &guid_null;
 746 }
 747 
 748 static void reap_victim(struct nd_mapping *nd_mapping,
 749                 struct nd_label_ent *victim)
 750 {
 751         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 752         u32 slot = to_slot(ndd, victim->label);
 753 
 754         dev_dbg(ndd->dev, "free: %d\n", slot);
 755         nd_label_free_slot(ndd, slot);
 756         victim->label = NULL;
 757 }
 758 
 759 static int __pmem_label_update(struct nd_region *nd_region,
 760                 struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
 761                 int pos, unsigned long flags)
 762 {
 763         struct nd_namespace_common *ndns = &nspm->nsio.common;
 764         struct nd_interleave_set *nd_set = nd_region->nd_set;
 765         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 766         struct nd_namespace_label *nd_label;
 767         struct nd_namespace_index *nsindex;
 768         struct nd_label_ent *label_ent;
 769         struct nd_label_id label_id;
 770         struct resource *res;
 771         unsigned long *free;
 772         u32 nslot, slot;
 773         size_t offset;
 774         u64 cookie;
 775         int rc;
 776 
 777         if (!preamble_next(ndd, &nsindex, &free, &nslot))
 778                 return -ENXIO;
 779 
 780         cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
 781         nd_label_gen_id(&label_id, nspm->uuid, 0);
 782         for_each_dpa_resource(ndd, res)
 783                 if (strcmp(res->name, label_id.id) == 0)
 784                         break;
 785 
 786         if (!res) {
 787                 WARN_ON_ONCE(1);
 788                 return -ENXIO;
 789         }
 790 
 791         /* allocate and write the label to the staging (next) index */
 792         slot = nd_label_alloc_slot(ndd);
 793         if (slot == UINT_MAX)
 794                 return -ENXIO;
 795         dev_dbg(ndd->dev, "allocated: %d\n", slot);
 796 
 797         nd_label = to_label(ndd, slot);
 798         memset(nd_label, 0, sizeof_namespace_label(ndd));
 799         memcpy(nd_label->uuid, nspm->uuid, NSLABEL_UUID_LEN);
 800         if (nspm->alt_name)
 801                 memcpy(nd_label->name, nspm->alt_name, NSLABEL_NAME_LEN);
 802         nd_label->flags = __cpu_to_le32(flags);
 803         nd_label->nlabel = __cpu_to_le16(nd_region->ndr_mappings);
 804         nd_label->position = __cpu_to_le16(pos);
 805         nd_label->isetcookie = __cpu_to_le64(cookie);
 806         nd_label->rawsize = __cpu_to_le64(resource_size(res));
 807         nd_label->lbasize = __cpu_to_le64(nspm->lbasize);
 808         nd_label->dpa = __cpu_to_le64(res->start);
 809         nd_label->slot = __cpu_to_le32(slot);
 810         if (namespace_label_has(ndd, type_guid))
 811                 guid_copy(&nd_label->type_guid, &nd_set->type_guid);
 812         if (namespace_label_has(ndd, abstraction_guid))
 813                 guid_copy(&nd_label->abstraction_guid,
 814                                 to_abstraction_guid(ndns->claim_class,
 815                                         &nd_label->abstraction_guid));
 816         if (namespace_label_has(ndd, checksum)) {
 817                 u64 sum;
 818 
 819                 nd_label->checksum = __cpu_to_le64(0);
 820                 sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
 821                 nd_label->checksum = __cpu_to_le64(sum);
 822         }
 823         nd_dbg_dpa(nd_region, ndd, res, "\n");
 824 
 825         /* update label */
 826         offset = nd_label_offset(ndd, nd_label);
 827         rc = nvdimm_set_config_data(ndd, offset, nd_label,
 828                         sizeof_namespace_label(ndd));
 829         if (rc < 0)
 830                 return rc;
 831 
 832         /* Garbage collect the previous label */
 833         mutex_lock(&nd_mapping->lock);
 834         list_for_each_entry(label_ent, &nd_mapping->labels, list) {
 835                 if (!label_ent->label)
 836                         continue;
 837                 if (test_and_clear_bit(ND_LABEL_REAP, &label_ent->flags)
 838                                 || memcmp(nspm->uuid, label_ent->label->uuid,
 839                                         NSLABEL_UUID_LEN) == 0)
 840                         reap_victim(nd_mapping, label_ent);
 841         }
 842 
 843         /* update index */
 844         rc = nd_label_write_index(ndd, ndd->ns_next,
 845                         nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
 846         if (rc == 0) {
 847                 list_for_each_entry(label_ent, &nd_mapping->labels, list)
 848                         if (!label_ent->label) {
 849                                 label_ent->label = nd_label;
 850                                 nd_label = NULL;
 851                                 break;
 852                         }
 853                 dev_WARN_ONCE(&nspm->nsio.common.dev, nd_label,
 854                                 "failed to track label: %d\n",
 855                                 to_slot(ndd, nd_label));
 856                 if (nd_label)
 857                         rc = -ENXIO;
 858         }
 859         mutex_unlock(&nd_mapping->lock);
 860 
 861         return rc;
 862 }
 863 
 864 static bool is_old_resource(struct resource *res, struct resource **list, int n)
 865 {
 866         int i;
 867 
 868         if (res->flags & DPA_RESOURCE_ADJUSTED)
 869                 return false;
 870         for (i = 0; i < n; i++)
 871                 if (res == list[i])
 872                         return true;
 873         return false;
 874 }
 875 
 876 static struct resource *to_resource(struct nvdimm_drvdata *ndd,
 877                 struct nd_namespace_label *nd_label)
 878 {
 879         struct resource *res;
 880 
 881         for_each_dpa_resource(ndd, res) {
 882                 if (res->start != __le64_to_cpu(nd_label->dpa))
 883                         continue;
 884                 if (resource_size(res) != __le64_to_cpu(nd_label->rawsize))
 885                         continue;
 886                 return res;
 887         }
 888 
 889         return NULL;
 890 }
 891 
 892 /*
 893  * 1/ Account all the labels that can be freed after this update
 894  * 2/ Allocate and write the label to the staging (next) index
 895  * 3/ Record the resources in the namespace device
 896  */
 897 static int __blk_label_update(struct nd_region *nd_region,
 898                 struct nd_mapping *nd_mapping, struct nd_namespace_blk *nsblk,
 899                 int num_labels)
 900 {
 901         int i, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO;
 902         struct nd_interleave_set *nd_set = nd_region->nd_set;
 903         struct nd_namespace_common *ndns = &nsblk->common;
 904         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 905         struct nd_namespace_label *nd_label;
 906         struct nd_label_ent *label_ent, *e;
 907         struct nd_namespace_index *nsindex;
 908         unsigned long *free, *victim_map = NULL;
 909         struct resource *res, **old_res_list;
 910         struct nd_label_id label_id;
 911         u8 uuid[NSLABEL_UUID_LEN];
 912         int min_dpa_idx = 0;
 913         LIST_HEAD(list);
 914         u32 nslot, slot;
 915 
 916         if (!preamble_next(ndd, &nsindex, &free, &nslot))
 917                 return -ENXIO;
 918 
 919         old_res_list = nsblk->res;
 920         nfree = nd_label_nfree(ndd);
 921         old_num_resources = nsblk->num_resources;
 922         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
 923 
 924         /*
 925          * We need to loop over the old resources a few times, which seems a
 926          * bit inefficient, but we need to know that we have the label
 927          * space before we start mutating the tracking structures.
 928          * Otherwise the recovery method of last resort for userspace is
 929          * disable and re-enable the parent region.
 930          */
 931         alloc = 0;
 932         for_each_dpa_resource(ndd, res) {
 933                 if (strcmp(res->name, label_id.id) != 0)
 934                         continue;
 935                 if (!is_old_resource(res, old_res_list, old_num_resources))
 936                         alloc++;
 937         }
 938 
 939         victims = 0;
 940         if (old_num_resources) {
 941                 /* convert old local-label-map to dimm-slot victim-map */
 942                 victim_map = bitmap_zalloc(nslot, GFP_KERNEL);
 943                 if (!victim_map)
 944                         return -ENOMEM;
 945 
 946                 /* mark unused labels for garbage collection */
 947                 for_each_clear_bit_le(slot, free, nslot) {
 948                         nd_label = to_label(ndd, slot);
 949                         memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
 950                         if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
 951                                 continue;
 952                         res = to_resource(ndd, nd_label);
 953                         if (res && is_old_resource(res, old_res_list,
 954                                                 old_num_resources))
 955                                 continue;
 956                         slot = to_slot(ndd, nd_label);
 957                         set_bit(slot, victim_map);
 958                         victims++;
 959                 }
 960         }
 961 
 962         /* don't allow updates that consume the last label */
 963         if (nfree - alloc < 0 || nfree - alloc + victims < 1) {
 964                 dev_info(&nsblk->common.dev, "insufficient label space\n");
 965                 bitmap_free(victim_map);
 966                 return -ENOSPC;
 967         }
 968         /* from here on we need to abort on error */
 969 
 970 
 971         /* assign all resources to the namespace before writing the labels */
 972         nsblk->res = NULL;
 973         nsblk->num_resources = 0;
 974         for_each_dpa_resource(ndd, res) {
 975                 if (strcmp(res->name, label_id.id) != 0)
 976                         continue;
 977                 if (!nsblk_add_resource(nd_region, ndd, nsblk, res->start)) {
 978                         rc = -ENOMEM;
 979                         goto abort;
 980                 }
 981         }
 982 
 983         /*
 984          * Find the resource associated with the first label in the set
 985          * per the v1.2 namespace specification.
 986          */
 987         for (i = 0; i < nsblk->num_resources; i++) {
 988                 struct resource *min = nsblk->res[min_dpa_idx];
 989 
 990                 res = nsblk->res[i];
 991                 if (res->start < min->start)
 992                         min_dpa_idx = i;
 993         }
 994 
 995         for (i = 0; i < nsblk->num_resources; i++) {
 996                 size_t offset;
 997 
 998                 res = nsblk->res[i];
 999                 if (is_old_resource(res, old_res_list, old_num_resources))
1000                         continue; /* carry-over */
1001                 slot = nd_label_alloc_slot(ndd);
1002                 if (slot == UINT_MAX)
1003                         goto abort;
1004                 dev_dbg(ndd->dev, "allocated: %d\n", slot);
1005 
1006                 nd_label = to_label(ndd, slot);
1007                 memset(nd_label, 0, sizeof_namespace_label(ndd));
1008                 memcpy(nd_label->uuid, nsblk->uuid, NSLABEL_UUID_LEN);
1009                 if (nsblk->alt_name)
1010                         memcpy(nd_label->name, nsblk->alt_name,
1011                                         NSLABEL_NAME_LEN);
1012                 nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_LOCAL);
1013 
1014                 /*
1015                  * Use the presence of the type_guid as a flag to
1016                  * determine isetcookie usage and nlabel + position
1017                  * policy for blk-aperture namespaces.
1018                  */
1019                 if (namespace_label_has(ndd, type_guid)) {
1020                         if (i == min_dpa_idx) {
1021                                 nd_label->nlabel = __cpu_to_le16(nsblk->num_resources);
1022                                 nd_label->position = __cpu_to_le16(0);
1023                         } else {
1024                                 nd_label->nlabel = __cpu_to_le16(0xffff);
1025                                 nd_label->position = __cpu_to_le16(0xffff);
1026                         }
1027                         nd_label->isetcookie = __cpu_to_le64(nd_set->cookie2);
1028                 } else {
1029                         nd_label->nlabel = __cpu_to_le16(0); /* N/A */
1030                         nd_label->position = __cpu_to_le16(0); /* N/A */
1031                         nd_label->isetcookie = __cpu_to_le64(0); /* N/A */
1032                 }
1033 
1034                 nd_label->dpa = __cpu_to_le64(res->start);
1035                 nd_label->rawsize = __cpu_to_le64(resource_size(res));
1036                 nd_label->lbasize = __cpu_to_le64(nsblk->lbasize);
1037                 nd_label->slot = __cpu_to_le32(slot);
1038                 if (namespace_label_has(ndd, type_guid))
1039                         guid_copy(&nd_label->type_guid, &nd_set->type_guid);
1040                 if (namespace_label_has(ndd, abstraction_guid))
1041                         guid_copy(&nd_label->abstraction_guid,
1042                                         to_abstraction_guid(ndns->claim_class,
1043                                                 &nd_label->abstraction_guid));
1044 
1045                 if (namespace_label_has(ndd, checksum)) {
1046                         u64 sum;
1047 
1048                         nd_label->checksum = __cpu_to_le64(0);
1049                         sum = nd_fletcher64(nd_label,
1050                                         sizeof_namespace_label(ndd), 1);
1051                         nd_label->checksum = __cpu_to_le64(sum);
1052                 }
1053 
1054                 /* update label */
1055                 offset = nd_label_offset(ndd, nd_label);
1056                 rc = nvdimm_set_config_data(ndd, offset, nd_label,
1057                                 sizeof_namespace_label(ndd));
1058                 if (rc < 0)
1059                         goto abort;
1060         }
1061 
1062         /* free up now unused slots in the new index */
1063         for_each_set_bit(slot, victim_map, victim_map ? nslot : 0) {
1064                 dev_dbg(ndd->dev, "free: %d\n", slot);
1065                 nd_label_free_slot(ndd, slot);
1066         }
1067 
1068         /* update index */
1069         rc = nd_label_write_index(ndd, ndd->ns_next,
1070                         nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
1071         if (rc)
1072                 goto abort;
1073 
1074         /*
1075          * Now that the on-dimm labels are up to date, fix up the tracking
1076          * entries in nd_mapping->labels
1077          */
1078         nlabel = 0;
1079         mutex_lock(&nd_mapping->lock);
1080         list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
1081                 nd_label = label_ent->label;
1082                 if (!nd_label)
1083                         continue;
1084                 nlabel++;
1085                 memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
1086                 if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
1087                         continue;
1088                 nlabel--;
1089                 list_move(&label_ent->list, &list);
1090                 label_ent->label = NULL;
1091         }
1092         list_splice_tail_init(&list, &nd_mapping->labels);
1093         mutex_unlock(&nd_mapping->lock);
1094 
1095         if (nlabel + nsblk->num_resources > num_labels) {
1096                 /*
1097                  * Bug, we can't end up with more resources than
1098                  * available labels
1099                  */
1100                 WARN_ON_ONCE(1);
1101                 rc = -ENXIO;
1102                 goto out;
1103         }
1104 
1105         mutex_lock(&nd_mapping->lock);
1106         label_ent = list_first_entry_or_null(&nd_mapping->labels,
1107                         typeof(*label_ent), list);
1108         if (!label_ent) {
1109                 WARN_ON(1);
1110                 mutex_unlock(&nd_mapping->lock);
1111                 rc = -ENXIO;
1112                 goto out;
1113         }
1114         for_each_clear_bit_le(slot, free, nslot) {
1115                 nd_label = to_label(ndd, slot);
1116                 memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
1117                 if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
1118                         continue;
1119                 res = to_resource(ndd, nd_label);
1120                 res->flags &= ~DPA_RESOURCE_ADJUSTED;
1121                 dev_vdbg(&nsblk->common.dev, "assign label slot: %d\n", slot);
1122                 list_for_each_entry_from(label_ent, &nd_mapping->labels, list) {
1123                         if (label_ent->label)
1124                                 continue;
1125                         label_ent->label = nd_label;
1126                         nd_label = NULL;
1127                         break;
1128                 }
1129                 if (nd_label)
1130                         dev_WARN(&nsblk->common.dev,
1131                                         "failed to track label slot%d\n", slot);
1132         }
1133         mutex_unlock(&nd_mapping->lock);
1134 
1135  out:
1136         kfree(old_res_list);
1137         bitmap_free(victim_map);
1138         return rc;
1139 
1140  abort:
1141         /*
1142          * 1/ repair the allocated label bitmap in the index
1143          * 2/ restore the resource list
1144          */
1145         nd_label_copy(ndd, nsindex, to_current_namespace_index(ndd));
1146         kfree(nsblk->res);
1147         nsblk->res = old_res_list;
1148         nsblk->num_resources = old_num_resources;
1149         old_res_list = NULL;
1150         goto out;
1151 }
1152 
1153 static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
1154 {
1155         int i, old_num_labels = 0;
1156         struct nd_label_ent *label_ent;
1157         struct nd_namespace_index *nsindex;
1158         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1159 
1160         mutex_lock(&nd_mapping->lock);
1161         list_for_each_entry(label_ent, &nd_mapping->labels, list)
1162                 old_num_labels++;
1163         mutex_unlock(&nd_mapping->lock);
1164 
1165         /*
1166          * We need to preserve all the old labels for the mapping so
1167          * they can be garbage collected after writing the new labels.
1168          */
1169         for (i = old_num_labels; i < num_labels; i++) {
1170                 label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
1171                 if (!label_ent)
1172                         return -ENOMEM;
1173                 mutex_lock(&nd_mapping->lock);
1174                 list_add_tail(&label_ent->list, &nd_mapping->labels);
1175                 mutex_unlock(&nd_mapping->lock);
1176         }
1177 
1178         if (ndd->ns_current == -1 || ndd->ns_next == -1)
1179                 /* pass */;
1180         else
1181                 return max(num_labels, old_num_labels);
1182 
1183         nsindex = to_namespace_index(ndd, 0);
1184         memset(nsindex, 0, ndd->nsarea.config_size);
1185         for (i = 0; i < 2; i++) {
1186                 int rc = nd_label_write_index(ndd, i, 3 - i, ND_NSINDEX_INIT);
1187 
1188                 if (rc)
1189                         return rc;
1190         }
1191         ndd->ns_next = 1;
1192         ndd->ns_current = 0;
1193 
1194         return max(num_labels, old_num_labels);
1195 }
1196 
1197 static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
1198 {
1199         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1200         struct nd_label_ent *label_ent, *e;
1201         struct nd_namespace_index *nsindex;
1202         u8 label_uuid[NSLABEL_UUID_LEN];
1203         unsigned long *free;
1204         LIST_HEAD(list);
1205         u32 nslot, slot;
1206         int active = 0;
1207 
1208         if (!uuid)
1209                 return 0;
1210 
1211         /* no index || no labels == nothing to delete */
1212         if (!preamble_next(ndd, &nsindex, &free, &nslot))
1213                 return 0;
1214 
1215         mutex_lock(&nd_mapping->lock);
1216         list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
1217                 struct nd_namespace_label *nd_label = label_ent->label;
1218 
1219                 if (!nd_label)
1220                         continue;
1221                 active++;
1222                 memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
1223                 if (memcmp(label_uuid, uuid, NSLABEL_UUID_LEN) != 0)
1224                         continue;
1225                 active--;
1226                 slot = to_slot(ndd, nd_label);
1227                 nd_label_free_slot(ndd, slot);
1228                 dev_dbg(ndd->dev, "free: %d\n", slot);
1229                 list_move_tail(&label_ent->list, &list);
1230                 label_ent->label = NULL;
1231         }
1232         list_splice_tail_init(&list, &nd_mapping->labels);
1233 
1234         if (active == 0) {
1235                 nd_mapping_free_labels(nd_mapping);
1236                 dev_dbg(ndd->dev, "no more active labels\n");
1237         }
1238         mutex_unlock(&nd_mapping->lock);
1239 
1240         return nd_label_write_index(ndd, ndd->ns_next,
1241                         nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
1242 }
1243 
1244 int nd_pmem_namespace_label_update(struct nd_region *nd_region,
1245                 struct nd_namespace_pmem *nspm, resource_size_t size)
1246 {
1247         int i, rc;
1248 
1249         for (i = 0; i < nd_region->ndr_mappings; i++) {
1250                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1251                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1252                 struct resource *res;
1253                 int count = 0;
1254 
1255                 if (size == 0) {
1256                         rc = del_labels(nd_mapping, nspm->uuid);
1257                         if (rc)
1258                                 return rc;
1259                         continue;
1260                 }
1261 
1262                 for_each_dpa_resource(ndd, res)
1263                         if (strncmp(res->name, "pmem", 4) == 0)
1264                                 count++;
1265                 WARN_ON_ONCE(!count);
1266 
1267                 rc = init_labels(nd_mapping, count);
1268                 if (rc < 0)
1269                         return rc;
1270 
1271                 rc = __pmem_label_update(nd_region, nd_mapping, nspm, i,
1272                                 NSLABEL_FLAG_UPDATING);
1273                 if (rc)
1274                         return rc;
1275         }
1276 
1277         if (size == 0)
1278                 return 0;
1279 
1280         /* Clear the UPDATING flag per UEFI 2.7 expectations */
1281         for (i = 0; i < nd_region->ndr_mappings; i++) {
1282                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1283 
1284                 rc = __pmem_label_update(nd_region, nd_mapping, nspm, i, 0);
1285                 if (rc)
1286                         return rc;
1287         }
1288 
1289         return 0;
1290 }
1291 
1292 int nd_blk_namespace_label_update(struct nd_region *nd_region,
1293                 struct nd_namespace_blk *nsblk, resource_size_t size)
1294 {
1295         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
1296         struct resource *res;
1297         int count = 0;
1298 
1299         if (size == 0)
1300                 return del_labels(nd_mapping, nsblk->uuid);
1301 
1302         for_each_dpa_resource(to_ndd(nd_mapping), res)
1303                 count++;
1304 
1305         count = init_labels(nd_mapping, count);
1306         if (count < 0)
1307                 return count;
1308 
1309         return __blk_label_update(nd_region, nd_mapping, nsblk, count);
1310 }
1311 
1312 int __init nd_label_init(void)
1313 {
1314         WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
1315         WARN_ON(guid_parse(NVDIMM_BTT2_GUID, &nvdimm_btt2_guid));
1316         WARN_ON(guid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_guid));
1317         WARN_ON(guid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_guid));
1318 
1319         return 0;
1320 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/nvdimm/label.c

DEFINITIONS
