Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of version 2 of the GNU General Public License as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | */ |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/ndctl.h> |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 15 | #include <linux/slab.h> |
Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 16 | #include <linux/io.h> |
| 17 | #include <linux/nd.h> |
| 18 | #include "nd-core.h" |
| 19 | #include "label.h" |
| 20 | #include "nd.h" |
| 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 | size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd) |
| 38 | { |
| 39 | u32 index_span; |
| 40 | |
| 41 | if (ndd->nsindex_size) |
| 42 | return ndd->nsindex_size; |
| 43 | |
| 44 | /* |
| 45 | * The minimum index space is 512 bytes, with that amount of |
| 46 | * index we can describe ~1400 labels which is less than a byte |
| 47 | * of overhead per label. Round up to a byte of overhead per |
| 48 | * label and determine the size of the index region. Yes, this |
| 49 | * starts to waste space at larger config_sizes, but it's |
| 50 | * unlikely we'll ever see anything but 128K. |
| 51 | */ |
| 52 | index_span = ndd->nsarea.config_size / 129; |
| 53 | index_span /= NSINDEX_ALIGN * 2; |
| 54 | ndd->nsindex_size = index_span * NSINDEX_ALIGN; |
| 55 | |
| 56 | return ndd->nsindex_size; |
| 57 | } |
| 58 | |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 59 | int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd) |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 60 | { |
| 61 | return ndd->nsarea.config_size / 129; |
| 62 | } |
| 63 | |
Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 64 | int nd_label_validate(struct nvdimm_drvdata *ndd) |
| 65 | { |
| 66 | /* |
| 67 | * On media label format consists of two index blocks followed |
| 68 | * by an array of labels. None of these structures are ever |
| 69 | * updated in place. A sequence number tracks the current |
| 70 | * active index and the next one to write, while labels are |
| 71 | * written to free slots. |
| 72 | * |
| 73 | * +------------+ |
| 74 | * | | |
| 75 | * | nsindex0 | |
| 76 | * | | |
| 77 | * +------------+ |
| 78 | * | | |
| 79 | * | nsindex1 | |
| 80 | * | | |
| 81 | * +------------+ |
| 82 | * | label0 | |
| 83 | * +------------+ |
| 84 | * | label1 | |
| 85 | * +------------+ |
| 86 | * | | |
| 87 | * ....nslot... |
| 88 | * | | |
| 89 | * +------------+ |
| 90 | * | labelN | |
| 91 | * +------------+ |
| 92 | */ |
| 93 | struct nd_namespace_index *nsindex[] = { |
| 94 | to_namespace_index(ndd, 0), |
| 95 | to_namespace_index(ndd, 1), |
| 96 | }; |
| 97 | const int num_index = ARRAY_SIZE(nsindex); |
| 98 | struct device *dev = ndd->dev; |
| 99 | bool valid[2] = { 0 }; |
| 100 | int i, num_valid = 0; |
| 101 | u32 seq; |
| 102 | |
| 103 | for (i = 0; i < num_index; i++) { |
| 104 | u32 nslot; |
| 105 | u8 sig[NSINDEX_SIG_LEN]; |
| 106 | u64 sum_save, sum, size; |
| 107 | |
| 108 | memcpy(sig, nsindex[i]->sig, NSINDEX_SIG_LEN); |
| 109 | if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) { |
| 110 | dev_dbg(dev, "%s: nsindex%d signature invalid\n", |
| 111 | __func__, i); |
| 112 | continue; |
| 113 | } |
| 114 | sum_save = __le64_to_cpu(nsindex[i]->checksum); |
| 115 | nsindex[i]->checksum = __cpu_to_le64(0); |
| 116 | sum = nd_fletcher64(nsindex[i], sizeof_namespace_index(ndd), 1); |
| 117 | nsindex[i]->checksum = __cpu_to_le64(sum_save); |
| 118 | if (sum != sum_save) { |
| 119 | dev_dbg(dev, "%s: nsindex%d checksum invalid\n", |
| 120 | __func__, i); |
| 121 | continue; |
| 122 | } |
| 123 | |
| 124 | seq = __le32_to_cpu(nsindex[i]->seq); |
| 125 | if ((seq & NSINDEX_SEQ_MASK) == 0) { |
| 126 | dev_dbg(dev, "%s: nsindex%d sequence: %#x invalid\n", |
| 127 | __func__, i, seq); |
| 128 | continue; |
| 129 | } |
| 130 | |
| 131 | /* sanity check the index against expected values */ |
| 132 | if (__le64_to_cpu(nsindex[i]->myoff) |
| 133 | != i * sizeof_namespace_index(ndd)) { |
| 134 | dev_dbg(dev, "%s: nsindex%d myoff: %#llx invalid\n", |
| 135 | __func__, i, (unsigned long long) |
| 136 | __le64_to_cpu(nsindex[i]->myoff)); |
| 137 | continue; |
| 138 | } |
| 139 | if (__le64_to_cpu(nsindex[i]->otheroff) |
| 140 | != (!i) * sizeof_namespace_index(ndd)) { |
| 141 | dev_dbg(dev, "%s: nsindex%d otheroff: %#llx invalid\n", |
| 142 | __func__, i, (unsigned long long) |
| 143 | __le64_to_cpu(nsindex[i]->otheroff)); |
| 144 | continue; |
| 145 | } |
| 146 | |
| 147 | size = __le64_to_cpu(nsindex[i]->mysize); |
| 148 | if (size > sizeof_namespace_index(ndd) |
| 149 | || size < sizeof(struct nd_namespace_index)) { |
| 150 | dev_dbg(dev, "%s: nsindex%d mysize: %#llx invalid\n", |
| 151 | __func__, i, size); |
| 152 | continue; |
| 153 | } |
| 154 | |
| 155 | nslot = __le32_to_cpu(nsindex[i]->nslot); |
| 156 | if (nslot * sizeof(struct nd_namespace_label) |
| 157 | + 2 * sizeof_namespace_index(ndd) |
| 158 | > ndd->nsarea.config_size) { |
| 159 | dev_dbg(dev, "%s: nsindex%d nslot: %u invalid, config_size: %#x\n", |
| 160 | __func__, i, nslot, |
| 161 | ndd->nsarea.config_size); |
| 162 | continue; |
| 163 | } |
| 164 | valid[i] = true; |
| 165 | num_valid++; |
| 166 | } |
| 167 | |
| 168 | switch (num_valid) { |
| 169 | case 0: |
| 170 | break; |
| 171 | case 1: |
| 172 | for (i = 0; i < num_index; i++) |
| 173 | if (valid[i]) |
| 174 | return i; |
| 175 | /* can't have num_valid > 0 but valid[] = { false, false } */ |
| 176 | WARN_ON(1); |
| 177 | break; |
| 178 | default: |
| 179 | /* pick the best index... */ |
| 180 | seq = best_seq(__le32_to_cpu(nsindex[0]->seq), |
| 181 | __le32_to_cpu(nsindex[1]->seq)); |
| 182 | if (seq == (__le32_to_cpu(nsindex[1]->seq) & NSINDEX_SEQ_MASK)) |
| 183 | return 1; |
| 184 | else |
| 185 | return 0; |
| 186 | break; |
| 187 | } |
| 188 | |
| 189 | return -1; |
| 190 | } |
| 191 | |
| 192 | void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst, |
| 193 | struct nd_namespace_index *src) |
| 194 | { |
| 195 | if (dst && src) |
| 196 | /* pass */; |
| 197 | else |
| 198 | return; |
| 199 | |
| 200 | memcpy(dst, src, sizeof_namespace_index(ndd)); |
| 201 | } |
| 202 | |
| 203 | static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd) |
| 204 | { |
| 205 | void *base = to_namespace_index(ndd, 0); |
| 206 | |
| 207 | return base + 2 * sizeof_namespace_index(ndd); |
| 208 | } |
| 209 | |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 210 | static int to_slot(struct nvdimm_drvdata *ndd, |
| 211 | struct nd_namespace_label *nd_label) |
| 212 | { |
| 213 | return nd_label - nd_label_base(ndd); |
| 214 | } |
| 215 | |
Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 216 | #define for_each_clear_bit_le(bit, addr, size) \ |
| 217 | for ((bit) = find_next_zero_bit_le((addr), (size), 0); \ |
| 218 | (bit) < (size); \ |
| 219 | (bit) = find_next_zero_bit_le((addr), (size), (bit) + 1)) |
| 220 | |
| 221 | /** |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 222 | * preamble_index - common variable initialization for nd_label_* routines |
Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 223 | * @ndd: dimm container for the relevant label set |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 224 | * @idx: namespace_index index |
Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 225 | * @nsindex_out: on return set to the currently active namespace index |
| 226 | * @free: on return set to the free label bitmap in the index |
| 227 | * @nslot: on return set to the number of slots in the label space |
| 228 | */ |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 229 | static bool preamble_index(struct nvdimm_drvdata *ndd, int idx, |
Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 230 | struct nd_namespace_index **nsindex_out, |
| 231 | unsigned long **free, u32 *nslot) |
| 232 | { |
| 233 | struct nd_namespace_index *nsindex; |
| 234 | |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 235 | nsindex = to_namespace_index(ndd, idx); |
Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 236 | if (nsindex == NULL) |
| 237 | return false; |
| 238 | |
| 239 | *free = (unsigned long *) nsindex->free; |
| 240 | *nslot = __le32_to_cpu(nsindex->nslot); |
| 241 | *nsindex_out = nsindex; |
| 242 | |
| 243 | return true; |
| 244 | } |
| 245 | |
Dan Williams | bf9bccc | 2015-06-17 17:14:46 -0400 | [diff] [blame] | 246 | char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags) |
Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 247 | { |
| 248 | if (!label_id || !uuid) |
| 249 | return NULL; |
| 250 | snprintf(label_id->id, ND_LABEL_ID_SIZE, "%s-%pUb", |
| 251 | flags & NSLABEL_FLAG_LOCAL ? "blk" : "pmem", uuid); |
| 252 | return label_id->id; |
| 253 | } |
| 254 | |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 255 | static bool preamble_current(struct nvdimm_drvdata *ndd, |
| 256 | struct nd_namespace_index **nsindex, |
| 257 | unsigned long **free, u32 *nslot) |
| 258 | { |
| 259 | return preamble_index(ndd, ndd->ns_current, nsindex, |
| 260 | free, nslot); |
| 261 | } |
| 262 | |
| 263 | static bool preamble_next(struct nvdimm_drvdata *ndd, |
| 264 | struct nd_namespace_index **nsindex, |
| 265 | unsigned long **free, u32 *nslot) |
| 266 | { |
| 267 | return preamble_index(ndd, ndd->ns_next, nsindex, |
| 268 | free, nslot); |
| 269 | } |
| 270 | |
Dan Williams | 4a826c8 | 2015-06-09 16:09:36 -0400 | [diff] [blame] | 271 | static bool slot_valid(struct nd_namespace_label *nd_label, u32 slot) |
| 272 | { |
| 273 | /* check that we are written where we expect to be written */ |
| 274 | if (slot != __le32_to_cpu(nd_label->slot)) |
| 275 | return false; |
| 276 | |
| 277 | /* check that DPA allocations are page aligned */ |
| 278 | if ((__le64_to_cpu(nd_label->dpa) |
| 279 | | __le64_to_cpu(nd_label->rawsize)) % SZ_4K) |
| 280 | return false; |
| 281 | |
| 282 | return true; |
| 283 | } |
| 284 | |
| 285 | int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd) |
| 286 | { |
| 287 | struct nd_namespace_index *nsindex; |
| 288 | unsigned long *free; |
| 289 | u32 nslot, slot; |
| 290 | |
| 291 | if (!preamble_current(ndd, &nsindex, &free, &nslot)) |
| 292 | return 0; /* no label, nothing to reserve */ |
| 293 | |
| 294 | for_each_clear_bit_le(slot, free, nslot) { |
| 295 | struct nd_namespace_label *nd_label; |
| 296 | struct nd_region *nd_region = NULL; |
| 297 | u8 label_uuid[NSLABEL_UUID_LEN]; |
| 298 | struct nd_label_id label_id; |
| 299 | struct resource *res; |
| 300 | u32 flags; |
| 301 | |
| 302 | nd_label = nd_label_base(ndd) + slot; |
| 303 | |
| 304 | if (!slot_valid(nd_label, slot)) |
| 305 | continue; |
| 306 | |
| 307 | memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN); |
| 308 | flags = __le32_to_cpu(nd_label->flags); |
| 309 | nd_label_gen_id(&label_id, label_uuid, flags); |
| 310 | res = nvdimm_allocate_dpa(ndd, &label_id, |
| 311 | __le64_to_cpu(nd_label->dpa), |
| 312 | __le64_to_cpu(nd_label->rawsize)); |
| 313 | nd_dbg_dpa(nd_region, ndd, res, "reserve\n"); |
| 314 | if (!res) |
| 315 | return -EBUSY; |
| 316 | } |
| 317 | |
| 318 | return 0; |
| 319 | } |
Dan Williams | bf9bccc | 2015-06-17 17:14:46 -0400 | [diff] [blame] | 320 | |
| 321 | int nd_label_active_count(struct nvdimm_drvdata *ndd) |
| 322 | { |
| 323 | struct nd_namespace_index *nsindex; |
| 324 | unsigned long *free; |
| 325 | u32 nslot, slot; |
| 326 | int count = 0; |
| 327 | |
| 328 | if (!preamble_current(ndd, &nsindex, &free, &nslot)) |
| 329 | return 0; |
| 330 | |
| 331 | for_each_clear_bit_le(slot, free, nslot) { |
| 332 | struct nd_namespace_label *nd_label; |
| 333 | |
| 334 | nd_label = nd_label_base(ndd) + slot; |
| 335 | |
| 336 | if (!slot_valid(nd_label, slot)) { |
| 337 | u32 label_slot = __le32_to_cpu(nd_label->slot); |
| 338 | u64 size = __le64_to_cpu(nd_label->rawsize); |
| 339 | u64 dpa = __le64_to_cpu(nd_label->dpa); |
| 340 | |
| 341 | dev_dbg(ndd->dev, |
| 342 | "%s: slot%d invalid slot: %d dpa: %llx size: %llx\n", |
| 343 | __func__, slot, label_slot, dpa, size); |
| 344 | continue; |
| 345 | } |
| 346 | count++; |
| 347 | } |
| 348 | return count; |
| 349 | } |
| 350 | |
| 351 | struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n) |
| 352 | { |
| 353 | struct nd_namespace_index *nsindex; |
| 354 | unsigned long *free; |
| 355 | u32 nslot, slot; |
| 356 | |
| 357 | if (!preamble_current(ndd, &nsindex, &free, &nslot)) |
| 358 | return NULL; |
| 359 | |
| 360 | for_each_clear_bit_le(slot, free, nslot) { |
| 361 | struct nd_namespace_label *nd_label; |
| 362 | |
| 363 | nd_label = nd_label_base(ndd) + slot; |
| 364 | if (!slot_valid(nd_label, slot)) |
| 365 | continue; |
| 366 | |
| 367 | if (n-- == 0) |
| 368 | return nd_label_base(ndd) + slot; |
| 369 | } |
| 370 | |
| 371 | return NULL; |
| 372 | } |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 373 | |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 374 | u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd) |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 375 | { |
| 376 | struct nd_namespace_index *nsindex; |
| 377 | unsigned long *free; |
| 378 | u32 nslot, slot; |
| 379 | |
| 380 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) |
| 381 | return UINT_MAX; |
| 382 | |
| 383 | WARN_ON(!is_nvdimm_bus_locked(ndd->dev)); |
| 384 | |
| 385 | slot = find_next_bit_le(free, nslot, 0); |
| 386 | if (slot == nslot) |
| 387 | return UINT_MAX; |
| 388 | |
| 389 | clear_bit_le(slot, free); |
| 390 | |
| 391 | return slot; |
| 392 | } |
| 393 | |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 394 | bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot) |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 395 | { |
| 396 | struct nd_namespace_index *nsindex; |
| 397 | unsigned long *free; |
| 398 | u32 nslot; |
| 399 | |
| 400 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) |
| 401 | return false; |
| 402 | |
| 403 | WARN_ON(!is_nvdimm_bus_locked(ndd->dev)); |
| 404 | |
| 405 | if (slot < nslot) |
| 406 | return !test_and_set_bit_le(slot, free); |
| 407 | return false; |
| 408 | } |
| 409 | |
| 410 | u32 nd_label_nfree(struct nvdimm_drvdata *ndd) |
| 411 | { |
| 412 | struct nd_namespace_index *nsindex; |
| 413 | unsigned long *free; |
| 414 | u32 nslot; |
| 415 | |
| 416 | WARN_ON(!is_nvdimm_bus_locked(ndd->dev)); |
| 417 | |
| 418 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 419 | return nvdimm_num_label_slots(ndd); |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 420 | |
| 421 | return bitmap_weight(free, nslot); |
| 422 | } |
| 423 | |
| 424 | static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq, |
| 425 | unsigned long flags) |
| 426 | { |
| 427 | struct nd_namespace_index *nsindex; |
| 428 | unsigned long offset; |
| 429 | u64 checksum; |
| 430 | u32 nslot; |
| 431 | int rc; |
| 432 | |
| 433 | nsindex = to_namespace_index(ndd, index); |
| 434 | if (flags & ND_NSINDEX_INIT) |
| 435 | nslot = nvdimm_num_label_slots(ndd); |
| 436 | else |
| 437 | nslot = __le32_to_cpu(nsindex->nslot); |
| 438 | |
| 439 | memcpy(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN); |
| 440 | nsindex->flags = __cpu_to_le32(0); |
| 441 | nsindex->seq = __cpu_to_le32(seq); |
| 442 | offset = (unsigned long) nsindex |
| 443 | - (unsigned long) to_namespace_index(ndd, 0); |
| 444 | nsindex->myoff = __cpu_to_le64(offset); |
| 445 | nsindex->mysize = __cpu_to_le64(sizeof_namespace_index(ndd)); |
| 446 | offset = (unsigned long) to_namespace_index(ndd, |
| 447 | nd_label_next_nsindex(index)) |
| 448 | - (unsigned long) to_namespace_index(ndd, 0); |
| 449 | nsindex->otheroff = __cpu_to_le64(offset); |
| 450 | offset = (unsigned long) nd_label_base(ndd) |
| 451 | - (unsigned long) to_namespace_index(ndd, 0); |
| 452 | nsindex->labeloff = __cpu_to_le64(offset); |
| 453 | nsindex->nslot = __cpu_to_le32(nslot); |
| 454 | nsindex->major = __cpu_to_le16(1); |
| 455 | nsindex->minor = __cpu_to_le16(1); |
| 456 | nsindex->checksum = __cpu_to_le64(0); |
| 457 | if (flags & ND_NSINDEX_INIT) { |
| 458 | unsigned long *free = (unsigned long *) nsindex->free; |
| 459 | u32 nfree = ALIGN(nslot, BITS_PER_LONG); |
| 460 | int last_bits, i; |
| 461 | |
| 462 | memset(nsindex->free, 0xff, nfree / 8); |
| 463 | for (i = 0, last_bits = nfree - nslot; i < last_bits; i++) |
| 464 | clear_bit_le(nslot + i, free); |
| 465 | } |
| 466 | checksum = nd_fletcher64(nsindex, sizeof_namespace_index(ndd), 1); |
| 467 | nsindex->checksum = __cpu_to_le64(checksum); |
| 468 | rc = nvdimm_set_config_data(ndd, __le64_to_cpu(nsindex->myoff), |
| 469 | nsindex, sizeof_namespace_index(ndd)); |
| 470 | if (rc < 0) |
| 471 | return rc; |
| 472 | |
| 473 | if (flags & ND_NSINDEX_INIT) |
| 474 | return 0; |
| 475 | |
| 476 | /* copy the index we just wrote to the new 'next' */ |
| 477 | WARN_ON(index != ndd->ns_next); |
| 478 | nd_label_copy(ndd, to_current_namespace_index(ndd), nsindex); |
| 479 | ndd->ns_current = nd_label_next_nsindex(ndd->ns_current); |
| 480 | ndd->ns_next = nd_label_next_nsindex(ndd->ns_next); |
| 481 | WARN_ON(ndd->ns_current == ndd->ns_next); |
| 482 | |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd, |
| 487 | struct nd_namespace_label *nd_label) |
| 488 | { |
| 489 | return (unsigned long) nd_label |
| 490 | - (unsigned long) to_namespace_index(ndd, 0); |
| 491 | } |
| 492 | |
| 493 | static int __pmem_label_update(struct nd_region *nd_region, |
| 494 | struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm, |
| 495 | int pos) |
| 496 | { |
| 497 | u64 cookie = nd_region_interleave_set_cookie(nd_region), rawsize; |
| 498 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| 499 | struct nd_namespace_label *victim_label; |
| 500 | struct nd_namespace_label *nd_label; |
| 501 | struct nd_namespace_index *nsindex; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 502 | struct nd_label_ent *label_ent; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 503 | unsigned long *free; |
| 504 | u32 nslot, slot; |
| 505 | size_t offset; |
| 506 | int rc; |
| 507 | |
| 508 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) |
| 509 | return -ENXIO; |
| 510 | |
| 511 | /* allocate and write the label to the staging (next) index */ |
| 512 | slot = nd_label_alloc_slot(ndd); |
| 513 | if (slot == UINT_MAX) |
| 514 | return -ENXIO; |
| 515 | dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot); |
| 516 | |
| 517 | nd_label = nd_label_base(ndd) + slot; |
| 518 | memset(nd_label, 0, sizeof(struct nd_namespace_label)); |
| 519 | memcpy(nd_label->uuid, nspm->uuid, NSLABEL_UUID_LEN); |
| 520 | if (nspm->alt_name) |
| 521 | memcpy(nd_label->name, nspm->alt_name, NSLABEL_NAME_LEN); |
| 522 | nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_UPDATING); |
| 523 | nd_label->nlabel = __cpu_to_le16(nd_region->ndr_mappings); |
| 524 | nd_label->position = __cpu_to_le16(pos); |
| 525 | nd_label->isetcookie = __cpu_to_le64(cookie); |
| 526 | rawsize = div_u64(resource_size(&nspm->nsio.res), |
| 527 | nd_region->ndr_mappings); |
| 528 | nd_label->rawsize = __cpu_to_le64(rawsize); |
| 529 | nd_label->dpa = __cpu_to_le64(nd_mapping->start); |
| 530 | nd_label->slot = __cpu_to_le32(slot); |
| 531 | |
| 532 | /* update label */ |
| 533 | offset = nd_label_offset(ndd, nd_label); |
| 534 | rc = nvdimm_set_config_data(ndd, offset, nd_label, |
| 535 | sizeof(struct nd_namespace_label)); |
| 536 | if (rc < 0) |
| 537 | return rc; |
| 538 | |
| 539 | /* Garbage collect the previous label */ |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 540 | mutex_lock(&nd_mapping->lock); |
| 541 | label_ent = list_first_entry_or_null(&nd_mapping->labels, |
| 542 | typeof(*label_ent), list); |
| 543 | WARN_ON(!label_ent); |
| 544 | victim_label = label_ent ? label_ent->label : NULL; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 545 | if (victim_label) { |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 546 | label_ent->label = NULL; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 547 | slot = to_slot(ndd, victim_label); |
| 548 | nd_label_free_slot(ndd, slot); |
| 549 | dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot); |
| 550 | } |
| 551 | |
| 552 | /* update index */ |
| 553 | rc = nd_label_write_index(ndd, ndd->ns_next, |
| 554 | nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0); |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 555 | if (rc == 0 && label_ent) |
| 556 | label_ent->label = nd_label; |
| 557 | mutex_unlock(&nd_mapping->lock); |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 558 | |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 559 | return rc; |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | static bool is_old_resource(struct resource *res, struct resource **list, int n) |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 563 | { |
| 564 | int i; |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 565 | |
| 566 | if (res->flags & DPA_RESOURCE_ADJUSTED) |
| 567 | return false; |
| 568 | for (i = 0; i < n; i++) |
| 569 | if (res == list[i]) |
| 570 | return true; |
| 571 | return false; |
| 572 | } |
| 573 | |
| 574 | static struct resource *to_resource(struct nvdimm_drvdata *ndd, |
| 575 | struct nd_namespace_label *nd_label) |
| 576 | { |
| 577 | struct resource *res; |
| 578 | |
| 579 | for_each_dpa_resource(ndd, res) { |
| 580 | if (res->start != __le64_to_cpu(nd_label->dpa)) |
| 581 | continue; |
| 582 | if (resource_size(res) != __le64_to_cpu(nd_label->rawsize)) |
| 583 | continue; |
| 584 | return res; |
| 585 | } |
| 586 | |
| 587 | return NULL; |
| 588 | } |
| 589 | |
| 590 | /* |
| 591 | * 1/ Account all the labels that can be freed after this update |
| 592 | * 2/ Allocate and write the label to the staging (next) index |
| 593 | * 3/ Record the resources in the namespace device |
| 594 | */ |
| 595 | static int __blk_label_update(struct nd_region *nd_region, |
| 596 | struct nd_mapping *nd_mapping, struct nd_namespace_blk *nsblk, |
| 597 | int num_labels) |
| 598 | { |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 599 | int i, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 600 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 601 | struct nd_namespace_label *nd_label; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 602 | struct nd_label_ent *label_ent, *e; |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 603 | struct nd_namespace_index *nsindex; |
| 604 | unsigned long *free, *victim_map = NULL; |
| 605 | struct resource *res, **old_res_list; |
| 606 | struct nd_label_id label_id; |
| 607 | u8 uuid[NSLABEL_UUID_LEN]; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 608 | LIST_HEAD(list); |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 609 | u32 nslot, slot; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 610 | |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 611 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) |
| 612 | return -ENXIO; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 613 | |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 614 | old_res_list = nsblk->res; |
| 615 | nfree = nd_label_nfree(ndd); |
| 616 | old_num_resources = nsblk->num_resources; |
| 617 | nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL); |
| 618 | |
| 619 | /* |
| 620 | * We need to loop over the old resources a few times, which seems a |
| 621 | * bit inefficient, but we need to know that we have the label |
| 622 | * space before we start mutating the tracking structures. |
| 623 | * Otherwise the recovery method of last resort for userspace is |
| 624 | * disable and re-enable the parent region. |
| 625 | */ |
| 626 | alloc = 0; |
| 627 | for_each_dpa_resource(ndd, res) { |
| 628 | if (strcmp(res->name, label_id.id) != 0) |
| 629 | continue; |
| 630 | if (!is_old_resource(res, old_res_list, old_num_resources)) |
| 631 | alloc++; |
| 632 | } |
| 633 | |
| 634 | victims = 0; |
| 635 | if (old_num_resources) { |
| 636 | /* convert old local-label-map to dimm-slot victim-map */ |
| 637 | victim_map = kcalloc(BITS_TO_LONGS(nslot), sizeof(long), |
| 638 | GFP_KERNEL); |
| 639 | if (!victim_map) |
| 640 | return -ENOMEM; |
| 641 | |
| 642 | /* mark unused labels for garbage collection */ |
| 643 | for_each_clear_bit_le(slot, free, nslot) { |
| 644 | nd_label = nd_label_base(ndd) + slot; |
| 645 | memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN); |
| 646 | if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0) |
| 647 | continue; |
| 648 | res = to_resource(ndd, nd_label); |
| 649 | if (res && is_old_resource(res, old_res_list, |
| 650 | old_num_resources)) |
| 651 | continue; |
| 652 | slot = to_slot(ndd, nd_label); |
| 653 | set_bit(slot, victim_map); |
| 654 | victims++; |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | /* don't allow updates that consume the last label */ |
| 659 | if (nfree - alloc < 0 || nfree - alloc + victims < 1) { |
Dan Williams | 8c2f7e8 | 2015-06-25 04:20:04 -0400 | [diff] [blame] | 660 | dev_info(&nsblk->common.dev, "insufficient label space\n"); |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 661 | kfree(victim_map); |
| 662 | return -ENOSPC; |
| 663 | } |
| 664 | /* from here on we need to abort on error */ |
| 665 | |
| 666 | |
| 667 | /* assign all resources to the namespace before writing the labels */ |
| 668 | nsblk->res = NULL; |
| 669 | nsblk->num_resources = 0; |
| 670 | for_each_dpa_resource(ndd, res) { |
| 671 | if (strcmp(res->name, label_id.id) != 0) |
| 672 | continue; |
| 673 | if (!nsblk_add_resource(nd_region, ndd, nsblk, res->start)) { |
| 674 | rc = -ENOMEM; |
| 675 | goto abort; |
| 676 | } |
| 677 | } |
| 678 | |
| 679 | for (i = 0; i < nsblk->num_resources; i++) { |
| 680 | size_t offset; |
| 681 | |
| 682 | res = nsblk->res[i]; |
| 683 | if (is_old_resource(res, old_res_list, old_num_resources)) |
| 684 | continue; /* carry-over */ |
| 685 | slot = nd_label_alloc_slot(ndd); |
| 686 | if (slot == UINT_MAX) |
| 687 | goto abort; |
| 688 | dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot); |
| 689 | |
| 690 | nd_label = nd_label_base(ndd) + slot; |
| 691 | memset(nd_label, 0, sizeof(struct nd_namespace_label)); |
| 692 | memcpy(nd_label->uuid, nsblk->uuid, NSLABEL_UUID_LEN); |
| 693 | if (nsblk->alt_name) |
| 694 | memcpy(nd_label->name, nsblk->alt_name, |
| 695 | NSLABEL_NAME_LEN); |
| 696 | nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_LOCAL); |
| 697 | nd_label->nlabel = __cpu_to_le16(0); /* N/A */ |
| 698 | nd_label->position = __cpu_to_le16(0); /* N/A */ |
| 699 | nd_label->isetcookie = __cpu_to_le64(0); /* N/A */ |
| 700 | nd_label->dpa = __cpu_to_le64(res->start); |
| 701 | nd_label->rawsize = __cpu_to_le64(resource_size(res)); |
| 702 | nd_label->lbasize = __cpu_to_le64(nsblk->lbasize); |
| 703 | nd_label->slot = __cpu_to_le32(slot); |
| 704 | |
| 705 | /* update label */ |
| 706 | offset = nd_label_offset(ndd, nd_label); |
| 707 | rc = nvdimm_set_config_data(ndd, offset, nd_label, |
| 708 | sizeof(struct nd_namespace_label)); |
| 709 | if (rc < 0) |
| 710 | goto abort; |
| 711 | } |
| 712 | |
| 713 | /* free up now unused slots in the new index */ |
| 714 | for_each_set_bit(slot, victim_map, victim_map ? nslot : 0) { |
| 715 | dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot); |
| 716 | nd_label_free_slot(ndd, slot); |
| 717 | } |
| 718 | |
| 719 | /* update index */ |
| 720 | rc = nd_label_write_index(ndd, ndd->ns_next, |
| 721 | nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0); |
| 722 | if (rc) |
| 723 | goto abort; |
| 724 | |
| 725 | /* |
| 726 | * Now that the on-dimm labels are up to date, fix up the tracking |
| 727 | * entries in nd_mapping->labels |
| 728 | */ |
| 729 | nlabel = 0; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 730 | mutex_lock(&nd_mapping->lock); |
| 731 | list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) { |
| 732 | nd_label = label_ent->label; |
| 733 | if (!nd_label) |
| 734 | continue; |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 735 | nlabel++; |
| 736 | memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN); |
| 737 | if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0) |
| 738 | continue; |
| 739 | nlabel--; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 740 | list_move(&label_ent->list, &list); |
| 741 | label_ent->label = NULL; |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 742 | } |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 743 | list_splice_tail_init(&list, &nd_mapping->labels); |
| 744 | mutex_unlock(&nd_mapping->lock); |
| 745 | |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 746 | if (nlabel + nsblk->num_resources > num_labels) { |
| 747 | /* |
| 748 | * Bug, we can't end up with more resources than |
| 749 | * available labels |
| 750 | */ |
| 751 | WARN_ON_ONCE(1); |
| 752 | rc = -ENXIO; |
| 753 | goto out; |
| 754 | } |
| 755 | |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 756 | mutex_lock(&nd_mapping->lock); |
| 757 | label_ent = list_first_entry_or_null(&nd_mapping->labels, |
| 758 | typeof(*label_ent), list); |
| 759 | if (!label_ent) { |
| 760 | WARN_ON(1); |
| 761 | mutex_unlock(&nd_mapping->lock); |
| 762 | rc = -ENXIO; |
| 763 | goto out; |
| 764 | } |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 765 | for_each_clear_bit_le(slot, free, nslot) { |
| 766 | nd_label = nd_label_base(ndd) + slot; |
| 767 | memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN); |
| 768 | if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0) |
| 769 | continue; |
| 770 | res = to_resource(ndd, nd_label); |
| 771 | res->flags &= ~DPA_RESOURCE_ADJUSTED; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 772 | dev_vdbg(&nsblk->common.dev, "assign label slot: %d\n", slot); |
| 773 | list_for_each_entry_from(label_ent, &nd_mapping->labels, list) { |
| 774 | if (label_ent->label) |
| 775 | continue; |
| 776 | label_ent->label = nd_label; |
| 777 | nd_label = NULL; |
| 778 | break; |
| 779 | } |
| 780 | if (nd_label) |
| 781 | dev_WARN(&nsblk->common.dev, |
| 782 | "failed to track label slot%d\n", slot); |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 783 | } |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 784 | mutex_unlock(&nd_mapping->lock); |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 785 | |
| 786 | out: |
| 787 | kfree(old_res_list); |
| 788 | kfree(victim_map); |
| 789 | return rc; |
| 790 | |
| 791 | abort: |
| 792 | /* |
| 793 | * 1/ repair the allocated label bitmap in the index |
| 794 | * 2/ restore the resource list |
| 795 | */ |
| 796 | nd_label_copy(ndd, nsindex, to_current_namespace_index(ndd)); |
| 797 | kfree(nsblk->res); |
| 798 | nsblk->res = old_res_list; |
| 799 | nsblk->num_resources = old_num_resources; |
| 800 | old_res_list = NULL; |
| 801 | goto out; |
| 802 | } |
| 803 | |
| 804 | static int init_labels(struct nd_mapping *nd_mapping, int num_labels) |
| 805 | { |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 806 | int i, old_num_labels = 0; |
| 807 | struct nd_label_ent *label_ent; |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 808 | struct nd_namespace_index *nsindex; |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 809 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 810 | |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 811 | mutex_lock(&nd_mapping->lock); |
| 812 | list_for_each_entry(label_ent, &nd_mapping->labels, list) |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 813 | old_num_labels++; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 814 | mutex_unlock(&nd_mapping->lock); |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 815 | |
| 816 | /* |
| 817 | * We need to preserve all the old labels for the mapping so |
| 818 | * they can be garbage collected after writing the new labels. |
| 819 | */ |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 820 | for (i = old_num_labels; i < num_labels; i++) { |
| 821 | label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL); |
| 822 | if (!label_ent) |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 823 | return -ENOMEM; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 824 | mutex_lock(&nd_mapping->lock); |
| 825 | list_add_tail(&label_ent->list, &nd_mapping->labels); |
| 826 | mutex_unlock(&nd_mapping->lock); |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 827 | } |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 828 | |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 829 | if (ndd->ns_current == -1 || ndd->ns_next == -1) |
| 830 | /* pass */; |
| 831 | else |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 832 | return max(num_labels, old_num_labels); |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 833 | |
| 834 | nsindex = to_namespace_index(ndd, 0); |
| 835 | memset(nsindex, 0, ndd->nsarea.config_size); |
| 836 | for (i = 0; i < 2; i++) { |
| 837 | int rc = nd_label_write_index(ndd, i, i*2, ND_NSINDEX_INIT); |
| 838 | |
| 839 | if (rc) |
| 840 | return rc; |
| 841 | } |
| 842 | ndd->ns_next = 1; |
| 843 | ndd->ns_current = 0; |
| 844 | |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 845 | return max(num_labels, old_num_labels); |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid) |
| 849 | { |
| 850 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 851 | struct nd_label_ent *label_ent, *e; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 852 | struct nd_namespace_index *nsindex; |
| 853 | u8 label_uuid[NSLABEL_UUID_LEN]; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 854 | unsigned long *free; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 855 | LIST_HEAD(list); |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 856 | u32 nslot, slot; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 857 | int active = 0; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 858 | |
| 859 | if (!uuid) |
| 860 | return 0; |
| 861 | |
| 862 | /* no index || no labels == nothing to delete */ |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 863 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 864 | return 0; |
| 865 | |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 866 | mutex_lock(&nd_mapping->lock); |
| 867 | list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) { |
| 868 | struct nd_namespace_label *nd_label = label_ent->label; |
| 869 | |
| 870 | if (!nd_label) |
| 871 | continue; |
| 872 | active++; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 873 | memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN); |
| 874 | if (memcmp(label_uuid, uuid, NSLABEL_UUID_LEN) != 0) |
| 875 | continue; |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 876 | active--; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 877 | slot = to_slot(ndd, nd_label); |
| 878 | nd_label_free_slot(ndd, slot); |
| 879 | dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot); |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 880 | list_move_tail(&label_ent->list, &list); |
| 881 | label_ent->label = NULL; |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 882 | } |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 883 | list_splice_tail_init(&list, &nd_mapping->labels); |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 884 | |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 885 | if (active == 0) { |
| 886 | nd_mapping_free_labels(nd_mapping); |
| 887 | dev_dbg(ndd->dev, "%s: no more active labels\n", __func__); |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 888 | } |
Dan Williams | ae8219f | 2016-09-19 16:04:21 -0700 | [diff] [blame^] | 889 | mutex_unlock(&nd_mapping->lock); |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 890 | |
| 891 | return nd_label_write_index(ndd, ndd->ns_next, |
| 892 | nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0); |
| 893 | } |
| 894 | |
| 895 | int nd_pmem_namespace_label_update(struct nd_region *nd_region, |
| 896 | struct nd_namespace_pmem *nspm, resource_size_t size) |
| 897 | { |
| 898 | int i; |
| 899 | |
| 900 | for (i = 0; i < nd_region->ndr_mappings; i++) { |
| 901 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| 902 | int rc; |
| 903 | |
| 904 | if (size == 0) { |
| 905 | rc = del_labels(nd_mapping, nspm->uuid); |
| 906 | if (rc) |
| 907 | return rc; |
| 908 | continue; |
| 909 | } |
| 910 | |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 911 | rc = init_labels(nd_mapping, 1); |
| 912 | if (rc < 0) |
Dan Williams | f524bf2 | 2015-05-30 12:36:02 -0400 | [diff] [blame] | 913 | return rc; |
| 914 | |
| 915 | rc = __pmem_label_update(nd_region, nd_mapping, nspm, i); |
| 916 | if (rc) |
| 917 | return rc; |
| 918 | } |
| 919 | |
| 920 | return 0; |
| 921 | } |
Dan Williams | 0ba1c63 | 2015-05-30 12:35:36 -0400 | [diff] [blame] | 922 | |
| 923 | int nd_blk_namespace_label_update(struct nd_region *nd_region, |
| 924 | struct nd_namespace_blk *nsblk, resource_size_t size) |
| 925 | { |
| 926 | struct nd_mapping *nd_mapping = &nd_region->mapping[0]; |
| 927 | struct resource *res; |
| 928 | int count = 0; |
| 929 | |
| 930 | if (size == 0) |
| 931 | return del_labels(nd_mapping, nsblk->uuid); |
| 932 | |
| 933 | for_each_dpa_resource(to_ndd(nd_mapping), res) |
| 934 | count++; |
| 935 | |
| 936 | count = init_labels(nd_mapping, count); |
| 937 | if (count < 0) |
| 938 | return count; |
| 939 | |
| 940 | return __blk_label_update(nd_region, nd_mapping, nsblk, count); |
| 941 | } |