drivers/nvme/target/configfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Configfs interface for the NVMe target.
   4  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
   5  */
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/slab.h>
  10 #include <linux/stat.h>
  11 #include <linux/ctype.h>
  12 #include <linux/pci.h>
  13 #include <linux/pci-p2pdma.h>
  14
  15 #include "nvmet.h"
  16
  17 static const struct config_item_type nvmet_host_type;
  18 static const struct config_item_type nvmet_subsys_type;
  19
  20 static LIST_HEAD(nvmet_ports_list);
  21 struct list_head *nvmet_ports = &nvmet_ports_list;
  22
  23 struct nvmet_type_name_map {
  24         u8              type;
  25         const char      *name;
  26 };
  27
  28 static struct nvmet_type_name_map nvmet_transport[] = {
  29         { NVMF_TRTYPE_RDMA,     "rdma" },
  30         { NVMF_TRTYPE_FC,       "fc" },
  31         { NVMF_TRTYPE_TCP,      "tcp" },
  32         { NVMF_TRTYPE_LOOP,     "loop" },
  33 };
  34
  35 static const struct nvmet_type_name_map nvmet_addr_family[] = {
  36         { NVMF_ADDR_FAMILY_PCI,         "pcie" },
  37         { NVMF_ADDR_FAMILY_IP4,         "ipv4" },
  38         { NVMF_ADDR_FAMILY_IP6,         "ipv6" },
  39         { NVMF_ADDR_FAMILY_IB,          "ib" },
  40         { NVMF_ADDR_FAMILY_FC,          "fc" },
  41         { NVMF_ADDR_FAMILY_LOOP,        "loop" },
  42 };
  43
  44 static bool nvmet_is_port_enabled(struct nvmet_port *p, const char *caller)
  45 {
  46         if (p->enabled)
  47                 pr_err("Disable port '%u' before changing attribute in %s\n",
  48                                 le16_to_cpu(p->disc_addr.portid), caller);
  49         return p->enabled;
  50 }
  51
  52 /*
  53  * nvmet_port Generic ConfigFS definitions.
  54  * Used in any place in the ConfigFS tree that refers to an address.
  55  */
  56 static ssize_t nvmet_addr_adrfam_show(struct config_item *item, char *page)
  57 {
  58         u8 adrfam = to_nvmet_port(item)->disc_addr.adrfam;
  59         int i;
  60
  61         for (i = 1; i < ARRAY_SIZE(nvmet_addr_family); i++) {
  62                 if (nvmet_addr_family[i].type == adrfam)
  63                         return sprintf(page, "%s\n", nvmet_addr_family[i].name);
  64         }
  65
  66         return sprintf(page, "\n");
  67 }
  68
  69 static ssize_t nvmet_addr_adrfam_store(struct config_item *item,
  70                 const char *page, size_t count)
  71 {
  72         struct nvmet_port *port = to_nvmet_port(item);
  73         int i;
  74
  75         if (nvmet_is_port_enabled(port, __func__))
  76                 return -EACCES;
  77
  78         for (i = 1; i < ARRAY_SIZE(nvmet_addr_family); i++) {
  79                 if (sysfs_streq(page, nvmet_addr_family[i].name))
  80                         goto found;
  81         }
  82
  83         pr_err("Invalid value '%s' for adrfam\n", page);
  84         return -EINVAL;
  85
  86 found:
  87         port->disc_addr.adrfam = nvmet_addr_family[i].type;
  88         return count;
  89 }
  90
  91 CONFIGFS_ATTR(nvmet_, addr_adrfam);
  92
  93 static ssize_t nvmet_addr_portid_show(struct config_item *item,
  94                 char *page)
  95 {
  96         struct nvmet_port *port = to_nvmet_port(item);
  97
  98         return snprintf(page, PAGE_SIZE, "%d\n",
  99                         le16_to_cpu(port->disc_addr.portid));
 100 }
 101
 102 static ssize_t nvmet_addr_portid_store(struct config_item *item,
 103                 const char *page, size_t count)
 104 {
 105         struct nvmet_port *port = to_nvmet_port(item);
 106         u16 portid = 0;
 107
 108         if (kstrtou16(page, 0, &portid)) {
 109                 pr_err("Invalid value '%s' for portid\n", page);
 110                 return -EINVAL;
 111         }
 112
 113         if (nvmet_is_port_enabled(port, __func__))
 114                 return -EACCES;
 115
 116         port->disc_addr.portid = cpu_to_le16(portid);
 117         return count;
 118 }
 119
 120 CONFIGFS_ATTR(nvmet_, addr_portid);
 121
 122 static ssize_t nvmet_addr_traddr_show(struct config_item *item,
 123                 char *page)
 124 {
 125         struct nvmet_port *port = to_nvmet_port(item);
 126
 127         return snprintf(page, PAGE_SIZE, "%s\n",
 128                         port->disc_addr.traddr);
 129 }
 130
 131 static ssize_t nvmet_addr_traddr_store(struct config_item *item,
 132                 const char *page, size_t count)
 133 {
 134         struct nvmet_port *port = to_nvmet_port(item);
 135
 136         if (count > NVMF_TRADDR_SIZE) {
 137                 pr_err("Invalid value '%s' for traddr\n", page);
 138                 return -EINVAL;
 139         }
 140
 141         if (nvmet_is_port_enabled(port, __func__))
 142                 return -EACCES;
 143
 144         if (sscanf(page, "%s\n", port->disc_addr.traddr) != 1)
 145                 return -EINVAL;
 146         return count;
 147 }
 148
 149 CONFIGFS_ATTR(nvmet_, addr_traddr);
 150
 151 static const struct nvmet_type_name_map nvmet_addr_treq[] = {
 152         { NVMF_TREQ_NOT_SPECIFIED,      "not specified" },
 153         { NVMF_TREQ_REQUIRED,           "required" },
 154         { NVMF_TREQ_NOT_REQUIRED,       "not required" },
 155 };
 156
 157 static ssize_t nvmet_addr_treq_show(struct config_item *item, char *page)
 158 {
 159         u8 treq = to_nvmet_port(item)->disc_addr.treq &
 160                 NVME_TREQ_SECURE_CHANNEL_MASK;
 161         int i;
 162
 163         for (i = 0; i < ARRAY_SIZE(nvmet_addr_treq); i++) {
 164                 if (treq == nvmet_addr_treq[i].type)
 165                         return sprintf(page, "%s\n", nvmet_addr_treq[i].name);
 166         }
 167
 168         return sprintf(page, "\n");
 169 }
 170
 171 static ssize_t nvmet_addr_treq_store(struct config_item *item,
 172                 const char *page, size_t count)
 173 {
 174         struct nvmet_port *port = to_nvmet_port(item);
 175         u8 treq = port->disc_addr.treq & ~NVME_TREQ_SECURE_CHANNEL_MASK;
 176         int i;
 177
 178         if (nvmet_is_port_enabled(port, __func__))
 179                 return -EACCES;
 180
 181         for (i = 0; i < ARRAY_SIZE(nvmet_addr_treq); i++) {
 182                 if (sysfs_streq(page, nvmet_addr_treq[i].name))
 183                         goto found;
 184         }
 185
 186         pr_err("Invalid value '%s' for treq\n", page);
 187         return -EINVAL;
 188
 189 found:
 190         treq |= nvmet_addr_treq[i].type;
 191         port->disc_addr.treq = treq;
 192         return count;
 193 }
 194
 195 CONFIGFS_ATTR(nvmet_, addr_treq);
 196
 197 static ssize_t nvmet_addr_trsvcid_show(struct config_item *item,
 198                 char *page)
 199 {
 200         struct nvmet_port *port = to_nvmet_port(item);
 201
 202         return snprintf(page, PAGE_SIZE, "%s\n",
 203                         port->disc_addr.trsvcid);
 204 }
 205
 206 static ssize_t nvmet_addr_trsvcid_store(struct config_item *item,
 207                 const char *page, size_t count)
 208 {
 209         struct nvmet_port *port = to_nvmet_port(item);
 210
 211         if (count > NVMF_TRSVCID_SIZE) {
 212                 pr_err("Invalid value '%s' for trsvcid\n", page);
 213                 return -EINVAL;
 214         }
 215         if (nvmet_is_port_enabled(port, __func__))
 216                 return -EACCES;
 217
 218         if (sscanf(page, "%s\n", port->disc_addr.trsvcid) != 1)
 219                 return -EINVAL;
 220         return count;
 221 }
 222
 223 CONFIGFS_ATTR(nvmet_, addr_trsvcid);
 224
 225 static ssize_t nvmet_param_inline_data_size_show(struct config_item *item,
 226                 char *page)
 227 {
 228         struct nvmet_port *port = to_nvmet_port(item);
 229
 230         return snprintf(page, PAGE_SIZE, "%d\n", port->inline_data_size);
 231 }
 232
 233 static ssize_t nvmet_param_inline_data_size_store(struct config_item *item,
 234                 const char *page, size_t count)
 235 {
 236         struct nvmet_port *port = to_nvmet_port(item);
 237         int ret;
 238
 239         if (nvmet_is_port_enabled(port, __func__))
 240                 return -EACCES;
 241         ret = kstrtoint(page, 0, &port->inline_data_size);
 242         if (ret) {
 243                 pr_err("Invalid value '%s' for inline_data_size\n", page);
 244                 return -EINVAL;
 245         }
 246         return count;
 247 }
 248
 249 CONFIGFS_ATTR(nvmet_, param_inline_data_size);
 250
 251 #ifdef CONFIG_BLK_DEV_INTEGRITY
 252 static ssize_t nvmet_param_pi_enable_show(struct config_item *item,
 253                 char *page)
 254 {
 255         struct nvmet_port *port = to_nvmet_port(item);
 256
 257         return snprintf(page, PAGE_SIZE, "%d\n", port->pi_enable);
 258 }
 259
 260 static ssize_t nvmet_param_pi_enable_store(struct config_item *item,
 261                 const char *page, size_t count)
 262 {
 263         struct nvmet_port *port = to_nvmet_port(item);
 264         bool val;
 265
 266         if (strtobool(page, &val))
 267                 return -EINVAL;
 268
 269         if (port->enabled) {
 270                 pr_err("Disable port before setting pi_enable value.\n");
 271                 return -EACCES;
 272         }
 273
 274         port->pi_enable = val;
 275         return count;
 276 }
 277
 278 CONFIGFS_ATTR(nvmet_, param_pi_enable);
 279 #endif
 280
 281 static ssize_t nvmet_addr_trtype_show(struct config_item *item,
 282                 char *page)
 283 {
 284         struct nvmet_port *port = to_nvmet_port(item);
 285         int i;
 286
 287         for (i = 0; i < ARRAY_SIZE(nvmet_transport); i++) {
 288                 if (port->disc_addr.trtype == nvmet_transport[i].type)
 289                         return sprintf(page, "%s\n", nvmet_transport[i].name);
 290         }
 291
 292         return sprintf(page, "\n");
 293 }
 294
 295 static void nvmet_port_init_tsas_rdma(struct nvmet_port *port)
 296 {
 297         port->disc_addr.tsas.rdma.qptype = NVMF_RDMA_QPTYPE_CONNECTED;
 298         port->disc_addr.tsas.rdma.prtype = NVMF_RDMA_PRTYPE_NOT_SPECIFIED;
 299         port->disc_addr.tsas.rdma.cms = NVMF_RDMA_CMS_RDMA_CM;
 300 }
 301
 302 static ssize_t nvmet_addr_trtype_store(struct config_item *item,
 303                 const char *page, size_t count)
 304 {
 305         struct nvmet_port *port = to_nvmet_port(item);
 306         int i;
 307
 308         if (nvmet_is_port_enabled(port, __func__))
 309                 return -EACCES;
 310
 311         for (i = 0; i < ARRAY_SIZE(nvmet_transport); i++) {
 312                 if (sysfs_streq(page, nvmet_transport[i].name))
 313                         goto found;
 314         }
 315
 316         pr_err("Invalid value '%s' for trtype\n", page);
 317         return -EINVAL;
 318
 319 found:
 320         memset(&port->disc_addr.tsas, 0, NVMF_TSAS_SIZE);
 321         port->disc_addr.trtype = nvmet_transport[i].type;
 322         if (port->disc_addr.trtype == NVMF_TRTYPE_RDMA)
 323                 nvmet_port_init_tsas_rdma(port);
 324         return count;
 325 }
 326
 327 CONFIGFS_ATTR(nvmet_, addr_trtype);
 328
 329 /*
 330  * Namespace structures & file operation functions below
 331  */
 332 static ssize_t nvmet_ns_device_path_show(struct config_item *item, char *page)
 333 {
 334         return sprintf(page, "%s\n", to_nvmet_ns(item)->device_path);
 335 }
 336
 337 static ssize_t nvmet_ns_device_path_store(struct config_item *item,
 338                 const char *page, size_t count)
 339 {
 340         struct nvmet_ns *ns = to_nvmet_ns(item);
 341         struct nvmet_subsys *subsys = ns->subsys;
 342         size_t len;
 343         int ret;
 344
 345         mutex_lock(&subsys->lock);
 346         ret = -EBUSY;
 347         if (ns->enabled)
 348                 goto out_unlock;
 349
 350         ret = -EINVAL;
 351         len = strcspn(page, "\n");
 352         if (!len)
 353                 goto out_unlock;
 354
 355         kfree(ns->device_path);
 356         ret = -ENOMEM;
 357         ns->device_path = kmemdup_nul(page, len, GFP_KERNEL);
 358         if (!ns->device_path)
 359                 goto out_unlock;
 360
 361         mutex_unlock(&subsys->lock);
 362         return count;
 363
 364 out_unlock:
 365         mutex_unlock(&subsys->lock);
 366         return ret;
 367 }
 368
 369 CONFIGFS_ATTR(nvmet_ns_, device_path);
 370
 371 #ifdef CONFIG_PCI_P2PDMA
 372 static ssize_t nvmet_ns_p2pmem_show(struct config_item *item, char *page)
 373 {
 374         struct nvmet_ns *ns = to_nvmet_ns(item);
 375
 376         return pci_p2pdma_enable_show(page, ns->p2p_dev, ns->use_p2pmem);
 377 }
 378
 379 static ssize_t nvmet_ns_p2pmem_store(struct config_item *item,
 380                 const char *page, size_t count)
 381 {
 382         struct nvmet_ns *ns = to_nvmet_ns(item);
 383         struct pci_dev *p2p_dev = NULL;
 384         bool use_p2pmem;
 385         int ret = count;
 386         int error;
 387
 388         mutex_lock(&ns->subsys->lock);
 389         if (ns->enabled) {
 390                 ret = -EBUSY;
 391                 goto out_unlock;
 392         }
 393
 394         error = pci_p2pdma_enable_store(page, &p2p_dev, &use_p2pmem);
 395         if (error) {
 396                 ret = error;
 397                 goto out_unlock;
 398         }
 399
 400         ns->use_p2pmem = use_p2pmem;
 401         pci_dev_put(ns->p2p_dev);
 402         ns->p2p_dev = p2p_dev;
 403
 404 out_unlock:
 405         mutex_unlock(&ns->subsys->lock);
 406
 407         return ret;
 408 }
 409
 410 CONFIGFS_ATTR(nvmet_ns_, p2pmem);
 411 #endif /* CONFIG_PCI_P2PDMA */
 412
 413 static ssize_t nvmet_ns_device_uuid_show(struct config_item *item, char *page)
 414 {
 415         return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->uuid);
 416 }
 417
 418 static ssize_t nvmet_ns_device_uuid_store(struct config_item *item,
 419                                           const char *page, size_t count)
 420 {
 421         struct nvmet_ns *ns = to_nvmet_ns(item);
 422         struct nvmet_subsys *subsys = ns->subsys;
 423         int ret = 0;
 424
 425         mutex_lock(&subsys->lock);
 426         if (ns->enabled) {
 427                 ret = -EBUSY;
 428                 goto out_unlock;
 429         }
 430
 431         if (uuid_parse(page, &ns->uuid))
 432                 ret = -EINVAL;
 433
 434 out_unlock:
 435         mutex_unlock(&subsys->lock);
 436         return ret ? ret : count;
 437 }
 438
 439 CONFIGFS_ATTR(nvmet_ns_, device_uuid);
 440
 441 static ssize_t nvmet_ns_device_nguid_show(struct config_item *item, char *page)
 442 {
 443         return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->nguid);
 444 }
 445
 446 static ssize_t nvmet_ns_device_nguid_store(struct config_item *item,
 447                 const char *page, size_t count)
 448 {
 449         struct nvmet_ns *ns = to_nvmet_ns(item);
 450         struct nvmet_subsys *subsys = ns->subsys;
 451         u8 nguid[16];
 452         const char *p = page;
 453         int i;
 454         int ret = 0;
 455
 456         mutex_lock(&subsys->lock);
 457         if (ns->enabled) {
 458                 ret = -EBUSY;
 459                 goto out_unlock;
 460         }
 461
 462         for (i = 0; i < 16; i++) {
 463                 if (p + 2 > page + count) {
 464                         ret = -EINVAL;
 465                         goto out_unlock;
 466                 }
 467                 if (!isxdigit(p[0]) || !isxdigit(p[1])) {
 468                         ret = -EINVAL;
 469                         goto out_unlock;
 470                 }
 471
 472                 nguid[i] = (hex_to_bin(p[0]) << 4) | hex_to_bin(p[1]);
 473                 p += 2;
 474
 475                 if (*p == '-' || *p == ':')
 476                         p++;
 477         }
 478
 479         memcpy(&ns->nguid, nguid, sizeof(nguid));
 480 out_unlock:
 481         mutex_unlock(&subsys->lock);
 482         return ret ? ret : count;
 483 }
 484
 485 CONFIGFS_ATTR(nvmet_ns_, device_nguid);
 486
 487 static ssize_t nvmet_ns_ana_grpid_show(struct config_item *item, char *page)
 488 {
 489         return sprintf(page, "%u\n", to_nvmet_ns(item)->anagrpid);
 490 }
 491
 492 static ssize_t nvmet_ns_ana_grpid_store(struct config_item *item,
 493                 const char *page, size_t count)
 494 {
 495         struct nvmet_ns *ns = to_nvmet_ns(item);
 496         u32 oldgrpid, newgrpid;
 497         int ret;
 498
 499         ret = kstrtou32(page, 0, &newgrpid);
 500         if (ret)
 501                 return ret;
 502
 503         if (newgrpid < 1 || newgrpid > NVMET_MAX_ANAGRPS)
 504                 return -EINVAL;
 505
 506         down_write(&nvmet_ana_sem);
 507         oldgrpid = ns->anagrpid;
 508         nvmet_ana_group_enabled[newgrpid]++;
 509         ns->anagrpid = newgrpid;
 510         nvmet_ana_group_enabled[oldgrpid]--;
 511         nvmet_ana_chgcnt++;
 512         up_write(&nvmet_ana_sem);
 513
 514         nvmet_send_ana_event(ns->subsys, NULL);
 515         return count;
 516 }
 517
 518 CONFIGFS_ATTR(nvmet_ns_, ana_grpid);
 519
 520 static ssize_t nvmet_ns_enable_show(struct config_item *item, char *page)
 521 {
 522         return sprintf(page, "%d\n", to_nvmet_ns(item)->enabled);
 523 }
 524
 525 static ssize_t nvmet_ns_enable_store(struct config_item *item,
 526                 const char *page, size_t count)
 527 {
 528         struct nvmet_ns *ns = to_nvmet_ns(item);
 529         bool enable;
 530         int ret = 0;
 531
 532         if (strtobool(page, &enable))
 533                 return -EINVAL;
 534
 535         if (enable)
 536                 ret = nvmet_ns_enable(ns);
 537         else
 538                 nvmet_ns_disable(ns);
 539
 540         return ret ? ret : count;
 541 }
 542
 543 CONFIGFS_ATTR(nvmet_ns_, enable);
 544
 545 static ssize_t nvmet_ns_buffered_io_show(struct config_item *item, char *page)
 546 {
 547         return sprintf(page, "%d\n", to_nvmet_ns(item)->buffered_io);
 548 }
 549
 550 static ssize_t nvmet_ns_buffered_io_store(struct config_item *item,
 551                 const char *page, size_t count)
 552 {
 553         struct nvmet_ns *ns = to_nvmet_ns(item);
 554         bool val;
 555
 556         if (strtobool(page, &val))
 557                 return -EINVAL;
 558
 559         mutex_lock(&ns->subsys->lock);
 560         if (ns->enabled) {
 561                 pr_err("disable ns before setting buffered_io value.\n");
 562                 mutex_unlock(&ns->subsys->lock);
 563                 return -EINVAL;
 564         }
 565
 566         ns->buffered_io = val;
 567         mutex_unlock(&ns->subsys->lock);
 568         return count;
 569 }
 570
 571 CONFIGFS_ATTR(nvmet_ns_, buffered_io);
 572
 573 static ssize_t nvmet_ns_revalidate_size_store(struct config_item *item,
 574                 const char *page, size_t count)
 575 {
 576         struct nvmet_ns *ns = to_nvmet_ns(item);
 577         bool val;
 578
 579         if (strtobool(page, &val))
 580                 return -EINVAL;
 581
 582         if (!val)
 583                 return -EINVAL;
 584
 585         mutex_lock(&ns->subsys->lock);
 586         if (!ns->enabled) {
 587                 pr_err("enable ns before revalidate.\n");
 588                 mutex_unlock(&ns->subsys->lock);
 589                 return -EINVAL;
 590         }
 591         nvmet_ns_revalidate(ns);
 592         mutex_unlock(&ns->subsys->lock);
 593         return count;
 594 }
 595
 596 CONFIGFS_ATTR_WO(nvmet_ns_, revalidate_size);
 597
 598 static struct configfs_attribute *nvmet_ns_attrs[] = {
 599         &nvmet_ns_attr_device_path,
 600         &nvmet_ns_attr_device_nguid,
 601         &nvmet_ns_attr_device_uuid,
 602         &nvmet_ns_attr_ana_grpid,
 603         &nvmet_ns_attr_enable,
 604         &nvmet_ns_attr_buffered_io,
 605         &nvmet_ns_attr_revalidate_size,
 606 #ifdef CONFIG_PCI_P2PDMA
 607         &nvmet_ns_attr_p2pmem,
 608 #endif
 609         NULL,
 610 };
 611
 612 static void nvmet_ns_release(struct config_item *item)
 613 {
 614         struct nvmet_ns *ns = to_nvmet_ns(item);
 615
 616         nvmet_ns_free(ns);
 617 }
 618
 619 static struct configfs_item_operations nvmet_ns_item_ops = {
 620         .release                = nvmet_ns_release,
 621 };
 622
 623 static const struct config_item_type nvmet_ns_type = {
 624         .ct_item_ops            = &nvmet_ns_item_ops,
 625         .ct_attrs               = nvmet_ns_attrs,
 626         .ct_owner               = THIS_MODULE,
 627 };
 628
 629 static struct config_group *nvmet_ns_make(struct config_group *group,
 630                 const char *name)
 631 {
 632         struct nvmet_subsys *subsys = namespaces_to_subsys(&group->cg_item);
 633         struct nvmet_ns *ns;
 634         int ret;
 635         u32 nsid;
 636
 637         ret = kstrtou32(name, 0, &nsid);
 638         if (ret)
 639                 goto out;
 640
 641         ret = -EINVAL;
 642         if (nsid == 0 || nsid == NVME_NSID_ALL) {
 643                 pr_err("invalid nsid %#x", nsid);
 644                 goto out;
 645         }
 646
 647         ret = -ENOMEM;
 648         ns = nvmet_ns_alloc(subsys, nsid);
 649         if (!ns)
 650                 goto out;
 651         config_group_init_type_name(&ns->group, name, &nvmet_ns_type);
 652
 653         pr_info("adding nsid %d to subsystem %s\n", nsid, subsys->subsysnqn);
 654
 655         return &ns->group;
 656 out:
 657         return ERR_PTR(ret);
 658 }
 659
 660 static struct configfs_group_operations nvmet_namespaces_group_ops = {
 661         .make_group             = nvmet_ns_make,
 662 };
 663
 664 static const struct config_item_type nvmet_namespaces_type = {
 665         .ct_group_ops           = &nvmet_namespaces_group_ops,
 666         .ct_owner               = THIS_MODULE,
 667 };
 668
 669 #ifdef CONFIG_NVME_TARGET_PASSTHRU
 670
 671 static ssize_t nvmet_passthru_device_path_show(struct config_item *item,
 672                 char *page)
 673 {
 674         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 675
 676         return snprintf(page, PAGE_SIZE, "%s\n", subsys->passthru_ctrl_path);
 677 }
 678
 679 static ssize_t nvmet_passthru_device_path_store(struct config_item *item,
 680                 const char *page, size_t count)
 681 {
 682         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 683         size_t len;
 684         int ret;
 685
 686         mutex_lock(&subsys->lock);
 687
 688         ret = -EBUSY;
 689         if (subsys->passthru_ctrl)
 690                 goto out_unlock;
 691
 692         ret = -EINVAL;
 693         len = strcspn(page, "\n");
 694         if (!len)
 695                 goto out_unlock;
 696
 697         kfree(subsys->passthru_ctrl_path);
 698         ret = -ENOMEM;
 699         subsys->passthru_ctrl_path = kstrndup(page, len, GFP_KERNEL);
 700         if (!subsys->passthru_ctrl_path)
 701                 goto out_unlock;
 702
 703         mutex_unlock(&subsys->lock);
 704
 705         return count;
 706 out_unlock:
 707         mutex_unlock(&subsys->lock);
 708         return ret;
 709 }
 710 CONFIGFS_ATTR(nvmet_passthru_, device_path);
 711
 712 static ssize_t nvmet_passthru_enable_show(struct config_item *item,
 713                 char *page)
 714 {
 715         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 716
 717         return sprintf(page, "%d\n", subsys->passthru_ctrl ? 1 : 0);
 718 }
 719
 720 static ssize_t nvmet_passthru_enable_store(struct config_item *item,
 721                 const char *page, size_t count)
 722 {
 723         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 724         bool enable;
 725         int ret = 0;
 726
 727         if (strtobool(page, &enable))
 728                 return -EINVAL;
 729
 730         if (enable)
 731                 ret = nvmet_passthru_ctrl_enable(subsys);
 732         else
 733                 nvmet_passthru_ctrl_disable(subsys);
 734
 735         return ret ? ret : count;
 736 }
 737 CONFIGFS_ATTR(nvmet_passthru_, enable);
 738
 739 static struct configfs_attribute *nvmet_passthru_attrs[] = {
 740         &nvmet_passthru_attr_device_path,
 741         &nvmet_passthru_attr_enable,
 742         NULL,
 743 };
 744
 745 static const struct config_item_type nvmet_passthru_type = {
 746         .ct_attrs               = nvmet_passthru_attrs,
 747         .ct_owner               = THIS_MODULE,
 748 };
 749
 750 static void nvmet_add_passthru_group(struct nvmet_subsys *subsys)
 751 {
 752         config_group_init_type_name(&subsys->passthru_group,
 753                                     "passthru", &nvmet_passthru_type);
 754         configfs_add_default_group(&subsys->passthru_group,
 755                                    &subsys->group);
 756 }
 757
 758 #else /* CONFIG_NVME_TARGET_PASSTHRU */
 759
 760 static void nvmet_add_passthru_group(struct nvmet_subsys *subsys)
 761 {
 762 }
 763
 764 #endif /* CONFIG_NVME_TARGET_PASSTHRU */
 765
 766 static int nvmet_port_subsys_allow_link(struct config_item *parent,
 767                 struct config_item *target)
 768 {
 769         struct nvmet_port *port = to_nvmet_port(parent->ci_parent);
 770         struct nvmet_subsys *subsys;
 771         struct nvmet_subsys_link *link, *p;
 772         int ret;
 773
 774         if (target->ci_type != &nvmet_subsys_type) {
 775                 pr_err("can only link subsystems into the subsystems dir.!\n");
 776                 return -EINVAL;
 777         }
 778         subsys = to_subsys(target);
 779         link = kmalloc(sizeof(*link), GFP_KERNEL);
 780         if (!link)
 781                 return -ENOMEM;
 782         link->subsys = subsys;
 783
 784         down_write(&nvmet_config_sem);
 785         ret = -EEXIST;
 786         list_for_each_entry(p, &port->subsystems, entry) {
 787                 if (p->subsys == subsys)
 788                         goto out_free_link;
 789         }
 790
 791         if (list_empty(&port->subsystems)) {
 792                 ret = nvmet_enable_port(port);
 793                 if (ret)
 794                         goto out_free_link;
 795         }
 796
 797         list_add_tail(&link->entry, &port->subsystems);
 798         nvmet_port_disc_changed(port, subsys);
 799
 800         up_write(&nvmet_config_sem);
 801         return 0;
 802
 803 out_free_link:
 804         up_write(&nvmet_config_sem);
 805         kfree(link);
 806         return ret;
 807 }
 808
 809 static void nvmet_port_subsys_drop_link(struct config_item *parent,
 810                 struct config_item *target)
 811 {
 812         struct nvmet_port *port = to_nvmet_port(parent->ci_parent);
 813         struct nvmet_subsys *subsys = to_subsys(target);
 814         struct nvmet_subsys_link *p;
 815
 816         down_write(&nvmet_config_sem);
 817         list_for_each_entry(p, &port->subsystems, entry) {
 818                 if (p->subsys == subsys)
 819                         goto found;
 820         }
 821         up_write(&nvmet_config_sem);
 822         return;
 823
 824 found:
 825         list_del(&p->entry);
 826         nvmet_port_del_ctrls(port, subsys);
 827         nvmet_port_disc_changed(port, subsys);
 828
 829         if (list_empty(&port->subsystems))
 830                 nvmet_disable_port(port);
 831         up_write(&nvmet_config_sem);
 832         kfree(p);
 833 }
 834
 835 static struct configfs_item_operations nvmet_port_subsys_item_ops = {
 836         .allow_link             = nvmet_port_subsys_allow_link,
 837         .drop_link              = nvmet_port_subsys_drop_link,
 838 };
 839
 840 static const struct config_item_type nvmet_port_subsys_type = {
 841         .ct_item_ops            = &nvmet_port_subsys_item_ops,
 842         .ct_owner               = THIS_MODULE,
 843 };
 844
 845 static int nvmet_allowed_hosts_allow_link(struct config_item *parent,
 846                 struct config_item *target)
 847 {
 848         struct nvmet_subsys *subsys = to_subsys(parent->ci_parent);
 849         struct nvmet_host *host;
 850         struct nvmet_host_link *link, *p;
 851         int ret;
 852
 853         if (target->ci_type != &nvmet_host_type) {
 854                 pr_err("can only link hosts into the allowed_hosts directory!\n");
 855                 return -EINVAL;
 856         }
 857
 858         host = to_host(target);
 859         link = kmalloc(sizeof(*link), GFP_KERNEL);
 860         if (!link)
 861                 return -ENOMEM;
 862         link->host = host;
 863
 864         down_write(&nvmet_config_sem);
 865         ret = -EINVAL;
 866         if (subsys->allow_any_host) {
 867                 pr_err("can't add hosts when allow_any_host is set!\n");
 868                 goto out_free_link;
 869         }
 870
 871         ret = -EEXIST;
 872         list_for_each_entry(p, &subsys->hosts, entry) {
 873                 if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host)))
 874                         goto out_free_link;
 875         }
 876         list_add_tail(&link->entry, &subsys->hosts);
 877         nvmet_subsys_disc_changed(subsys, host);
 878
 879         up_write(&nvmet_config_sem);
 880         return 0;
 881 out_free_link:
 882         up_write(&nvmet_config_sem);
 883         kfree(link);
 884         return ret;
 885 }
 886
 887 static void nvmet_allowed_hosts_drop_link(struct config_item *parent,
 888                 struct config_item *target)
 889 {
 890         struct nvmet_subsys *subsys = to_subsys(parent->ci_parent);
 891         struct nvmet_host *host = to_host(target);
 892         struct nvmet_host_link *p;
 893
 894         down_write(&nvmet_config_sem);
 895         list_for_each_entry(p, &subsys->hosts, entry) {
 896                 if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host)))
 897                         goto found;
 898         }
 899         up_write(&nvmet_config_sem);
 900         return;
 901
 902 found:
 903         list_del(&p->entry);
 904         nvmet_subsys_disc_changed(subsys, host);
 905
 906         up_write(&nvmet_config_sem);
 907         kfree(p);
 908 }
 909
 910 static struct configfs_item_operations nvmet_allowed_hosts_item_ops = {
 911         .allow_link             = nvmet_allowed_hosts_allow_link,
 912         .drop_link              = nvmet_allowed_hosts_drop_link,
 913 };
 914
 915 static const struct config_item_type nvmet_allowed_hosts_type = {
 916         .ct_item_ops            = &nvmet_allowed_hosts_item_ops,
 917         .ct_owner               = THIS_MODULE,
 918 };
 919
 920 static ssize_t nvmet_subsys_attr_allow_any_host_show(struct config_item *item,
 921                 char *page)
 922 {
 923         return snprintf(page, PAGE_SIZE, "%d\n",
 924                 to_subsys(item)->allow_any_host);
 925 }
 926
 927 static ssize_t nvmet_subsys_attr_allow_any_host_store(struct config_item *item,
 928                 const char *page, size_t count)
 929 {
 930         struct nvmet_subsys *subsys = to_subsys(item);
 931         bool allow_any_host;
 932         int ret = 0;
 933
 934         if (strtobool(page, &allow_any_host))
 935                 return -EINVAL;
 936
 937         down_write(&nvmet_config_sem);
 938         if (allow_any_host && !list_empty(&subsys->hosts)) {
 939                 pr_err("Can't set allow_any_host when explicit hosts are set!\n");
 940                 ret = -EINVAL;
 941                 goto out_unlock;
 942         }
 943
 944         if (subsys->allow_any_host != allow_any_host) {
 945                 subsys->allow_any_host = allow_any_host;
 946                 nvmet_subsys_disc_changed(subsys, NULL);
 947         }
 948
 949 out_unlock:
 950         up_write(&nvmet_config_sem);
 951         return ret ? ret : count;
 952 }
 953
 954 CONFIGFS_ATTR(nvmet_subsys_, attr_allow_any_host);
 955
 956 static ssize_t nvmet_subsys_attr_version_show(struct config_item *item,
 957                                               char *page)
 958 {
 959         struct nvmet_subsys *subsys = to_subsys(item);
 960
 961         if (NVME_TERTIARY(subsys->ver))
 962                 return snprintf(page, PAGE_SIZE, "%llu.%llu.%llu\n",
 963                                 NVME_MAJOR(subsys->ver),
 964                                 NVME_MINOR(subsys->ver),
 965                                 NVME_TERTIARY(subsys->ver));
 966
 967         return snprintf(page, PAGE_SIZE, "%llu.%llu\n",
 968                         NVME_MAJOR(subsys->ver),
 969                         NVME_MINOR(subsys->ver));
 970 }
 971
 972 static ssize_t nvmet_subsys_attr_version_store(struct config_item *item,
 973                                                const char *page, size_t count)
 974 {
 975         struct nvmet_subsys *subsys = to_subsys(item);
 976         int major, minor, tertiary = 0;
 977         int ret;
 978
 979         /* passthru subsystems use the underlying controller's version */
 980         if (nvmet_passthru_ctrl(subsys))
 981                 return -EINVAL;
 982
 983         ret = sscanf(page, "%d.%d.%d\n", &major, &minor, &tertiary);
 984         if (ret != 2 && ret != 3)
 985                 return -EINVAL;
 986
 987         down_write(&nvmet_config_sem);
 988         subsys->ver = NVME_VS(major, minor, tertiary);
 989         up_write(&nvmet_config_sem);
 990
 991         return count;
 992 }
 993 CONFIGFS_ATTR(nvmet_subsys_, attr_version);
 994
 995 static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item,
 996                                              char *page)
 997 {
 998         struct nvmet_subsys *subsys = to_subsys(item);
 999
1000         return snprintf(page, PAGE_SIZE, "%llx\n", subsys->serial);
1001 }
1002
1003 static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item,
1004                                               const char *page, size_t count)
1005 {
1006         u64 serial;
1007
1008         if (sscanf(page, "%llx\n", &serial) != 1)
1009                 return -EINVAL;
1010
1011         down_write(&nvmet_config_sem);
1012         to_subsys(item)->serial = serial;
1013         up_write(&nvmet_config_sem);
1014
1015         return count;
1016 }
1017 CONFIGFS_ATTR(nvmet_subsys_, attr_serial);
1018
1019 static ssize_t nvmet_subsys_attr_cntlid_min_show(struct config_item *item,
1020                                                  char *page)
1021 {
1022         return snprintf(page, PAGE_SIZE, "%u\n", to_subsys(item)->cntlid_min);
1023 }
1024
1025 static ssize_t nvmet_subsys_attr_cntlid_min_store(struct config_item *item,
1026                                                   const char *page, size_t cnt)
1027 {
1028         u16 cntlid_min;
1029
1030         if (sscanf(page, "%hu\n", &cntlid_min) != 1)
1031                 return -EINVAL;
1032
1033         if (cntlid_min == 0)
1034                 return -EINVAL;
1035
1036         down_write(&nvmet_config_sem);
1037         if (cntlid_min >= to_subsys(item)->cntlid_max)
1038                 goto out_unlock;
1039         to_subsys(item)->cntlid_min = cntlid_min;
1040         up_write(&nvmet_config_sem);
1041         return cnt;
1042
1043 out_unlock:
1044         up_write(&nvmet_config_sem);
1045         return -EINVAL;
1046 }
1047 CONFIGFS_ATTR(nvmet_subsys_, attr_cntlid_min);
1048
1049 static ssize_t nvmet_subsys_attr_cntlid_max_show(struct config_item *item,
1050                                                  char *page)
1051 {
1052         return snprintf(page, PAGE_SIZE, "%u\n", to_subsys(item)->cntlid_max);
1053 }
1054
1055 static ssize_t nvmet_subsys_attr_cntlid_max_store(struct config_item *item,
1056                                                   const char *page, size_t cnt)
1057 {
1058         u16 cntlid_max;
1059
1060         if (sscanf(page, "%hu\n", &cntlid_max) != 1)
1061                 return -EINVAL;
1062
1063         if (cntlid_max == 0)
1064                 return -EINVAL;
1065
1066         down_write(&nvmet_config_sem);
1067         if (cntlid_max <= to_subsys(item)->cntlid_min)
1068                 goto out_unlock;
1069         to_subsys(item)->cntlid_max = cntlid_max;
1070         up_write(&nvmet_config_sem);
1071         return cnt;
1072
1073 out_unlock:
1074         up_write(&nvmet_config_sem);
1075         return -EINVAL;
1076 }
1077 CONFIGFS_ATTR(nvmet_subsys_, attr_cntlid_max);
1078
1079 static ssize_t nvmet_subsys_attr_model_show(struct config_item *item,
1080                                             char *page)
1081 {
1082         struct nvmet_subsys *subsys = to_subsys(item);
1083         struct nvmet_subsys_model *subsys_model;
1084         char *model = NVMET_DEFAULT_CTRL_MODEL;
1085         int ret;
1086
1087         rcu_read_lock();
1088         subsys_model = rcu_dereference(subsys->model);
1089         if (subsys_model)
1090                 model = subsys_model->number;
1091         ret = snprintf(page, PAGE_SIZE, "%s\n", model);
1092         rcu_read_unlock();
1093
1094         return ret;
1095 }
1096
1097 /* See Section 1.5 of NVMe 1.4 */
1098 static bool nvmet_is_ascii(const char c)
1099 {
1100         return c >= 0x20 && c <= 0x7e;
1101 }
1102
1103 static ssize_t nvmet_subsys_attr_model_store(struct config_item *item,
1104                                              const char *page, size_t count)
1105 {
1106         struct nvmet_subsys *subsys = to_subsys(item);
1107         struct nvmet_subsys_model *new_model;
1108         char *new_model_number;
1109         int pos = 0, len;
1110
1111         len = strcspn(page, "\n");
1112         if (!len)
1113                 return -EINVAL;
1114
1115         for (pos = 0; pos < len; pos++) {
1116                 if (!nvmet_is_ascii(page[pos]))
1117                         return -EINVAL;
1118         }
1119
1120         new_model_number = kmemdup_nul(page, len, GFP_KERNEL);
1121         if (!new_model_number)
1122                 return -ENOMEM;
1123
1124         new_model = kzalloc(sizeof(*new_model) + len + 1, GFP_KERNEL);
1125         if (!new_model) {
1126                 kfree(new_model_number);
1127                 return -ENOMEM;
1128         }
1129         memcpy(new_model->number, new_model_number, len);
1130
1131         down_write(&nvmet_config_sem);
1132         mutex_lock(&subsys->lock);
1133         new_model = rcu_replace_pointer(subsys->model, new_model,
1134                                         mutex_is_locked(&subsys->lock));
1135         mutex_unlock(&subsys->lock);
1136         up_write(&nvmet_config_sem);
1137
1138         kfree_rcu(new_model, rcuhead);
1139         kfree(new_model_number);
1140
1141         return count;
1142 }
1143 CONFIGFS_ATTR(nvmet_subsys_, attr_model);
1144
1145 #ifdef CONFIG_BLK_DEV_INTEGRITY
1146 static ssize_t nvmet_subsys_attr_pi_enable_show(struct config_item *item,
1147                                                 char *page)
1148 {
1149         return snprintf(page, PAGE_SIZE, "%d\n", to_subsys(item)->pi_support);
1150 }
1151
1152 static ssize_t nvmet_subsys_attr_pi_enable_store(struct config_item *item,
1153                                                  const char *page, size_t count)
1154 {
1155         struct nvmet_subsys *subsys = to_subsys(item);
1156         bool pi_enable;
1157
1158         if (strtobool(page, &pi_enable))
1159                 return -EINVAL;
1160
1161         subsys->pi_support = pi_enable;
1162         return count;
1163 }
1164 CONFIGFS_ATTR(nvmet_subsys_, attr_pi_enable);
1165 #endif
1166
1167 static struct configfs_attribute *nvmet_subsys_attrs[] = {
1168         &nvmet_subsys_attr_attr_allow_any_host,
1169         &nvmet_subsys_attr_attr_version,
1170         &nvmet_subsys_attr_attr_serial,
1171         &nvmet_subsys_attr_attr_cntlid_min,
1172         &nvmet_subsys_attr_attr_cntlid_max,
1173         &nvmet_subsys_attr_attr_model,
1174 #ifdef CONFIG_BLK_DEV_INTEGRITY
1175         &nvmet_subsys_attr_attr_pi_enable,
1176 #endif
1177         NULL,
1178 };
1179
1180 /*
1181  * Subsystem structures & folder operation functions below
1182  */
1183 static void nvmet_subsys_release(struct config_item *item)
1184 {
1185         struct nvmet_subsys *subsys = to_subsys(item);
1186
1187         nvmet_subsys_del_ctrls(subsys);
1188         nvmet_subsys_put(subsys);
1189 }
1190
1191 static struct configfs_item_operations nvmet_subsys_item_ops = {
1192         .release                = nvmet_subsys_release,
1193 };
1194
1195 static const struct config_item_type nvmet_subsys_type = {
1196         .ct_item_ops            = &nvmet_subsys_item_ops,
1197         .ct_attrs               = nvmet_subsys_attrs,
1198         .ct_owner               = THIS_MODULE,
1199 };
1200
1201 static struct config_group *nvmet_subsys_make(struct config_group *group,
1202                 const char *name)
1203 {
1204         struct nvmet_subsys *subsys;
1205
1206         if (sysfs_streq(name, NVME_DISC_SUBSYS_NAME)) {
1207                 pr_err("can't create discovery subsystem through configfs\n");
1208                 return ERR_PTR(-EINVAL);
1209         }
1210
1211         subsys = nvmet_subsys_alloc(name, NVME_NQN_NVME);
1212         if (IS_ERR(subsys))
1213                 return ERR_CAST(subsys);
1214
1215         config_group_init_type_name(&subsys->group, name, &nvmet_subsys_type);
1216
1217         config_group_init_type_name(&subsys->namespaces_group,
1218                         "namespaces", &nvmet_namespaces_type);
1219         configfs_add_default_group(&subsys->namespaces_group, &subsys->group);
1220
1221         config_group_init_type_name(&subsys->allowed_hosts_group,
1222                         "allowed_hosts", &nvmet_allowed_hosts_type);
1223         configfs_add_default_group(&subsys->allowed_hosts_group,
1224                         &subsys->group);
1225
1226         nvmet_add_passthru_group(subsys);
1227
1228         return &subsys->group;
1229 }
1230
1231 static struct configfs_group_operations nvmet_subsystems_group_ops = {
1232         .make_group             = nvmet_subsys_make,
1233 };
1234
1235 static const struct config_item_type nvmet_subsystems_type = {
1236         .ct_group_ops           = &nvmet_subsystems_group_ops,
1237         .ct_owner               = THIS_MODULE,
1238 };
1239
1240 static ssize_t nvmet_referral_enable_show(struct config_item *item,
1241                 char *page)
1242 {
1243         return snprintf(page, PAGE_SIZE, "%d\n", to_nvmet_port(item)->enabled);
1244 }
1245
1246 static ssize_t nvmet_referral_enable_store(struct config_item *item,
1247                 const char *page, size_t count)
1248 {
1249         struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent);
1250         struct nvmet_port *port = to_nvmet_port(item);
1251         bool enable;
1252
1253         if (strtobool(page, &enable))
1254                 goto inval;
1255
1256         if (enable)
1257                 nvmet_referral_enable(parent, port);
1258         else
1259                 nvmet_referral_disable(parent, port);
1260
1261         return count;
1262 inval:
1263         pr_err("Invalid value '%s' for enable\n", page);
1264         return -EINVAL;
1265 }
1266
1267 CONFIGFS_ATTR(nvmet_referral_, enable);
1268
1269 /*
1270  * Discovery Service subsystem definitions
1271  */
1272 static struct configfs_attribute *nvmet_referral_attrs[] = {
1273         &nvmet_attr_addr_adrfam,
1274         &nvmet_attr_addr_portid,
1275         &nvmet_attr_addr_treq,
1276         &nvmet_attr_addr_traddr,
1277         &nvmet_attr_addr_trsvcid,
1278         &nvmet_attr_addr_trtype,
1279         &nvmet_referral_attr_enable,
1280         NULL,
1281 };
1282
1283 static void nvmet_referral_notify(struct config_group *group,
1284                 struct config_item *item)
1285 {
1286         struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent);
1287         struct nvmet_port *port = to_nvmet_port(item);
1288
1289         nvmet_referral_disable(parent, port);
1290 }
1291
1292 static void nvmet_referral_release(struct config_item *item)
1293 {
1294         struct nvmet_port *port = to_nvmet_port(item);
1295
1296         kfree(port);
1297 }
1298
1299 static struct configfs_item_operations nvmet_referral_item_ops = {
1300         .release        = nvmet_referral_release,
1301 };
1302
1303 static const struct config_item_type nvmet_referral_type = {
1304         .ct_owner       = THIS_MODULE,
1305         .ct_attrs       = nvmet_referral_attrs,
1306         .ct_item_ops    = &nvmet_referral_item_ops,
1307 };
1308
1309 static struct config_group *nvmet_referral_make(
1310                 struct config_group *group, const char *name)
1311 {
1312         struct nvmet_port *port;
1313
1314         port = kzalloc(sizeof(*port), GFP_KERNEL);
1315         if (!port)
1316                 return ERR_PTR(-ENOMEM);
1317
1318         INIT_LIST_HEAD(&port->entry);
1319         config_group_init_type_name(&port->group, name, &nvmet_referral_type);
1320
1321         return &port->group;
1322 }
1323
1324 static struct configfs_group_operations nvmet_referral_group_ops = {
1325         .make_group             = nvmet_referral_make,
1326         .disconnect_notify      = nvmet_referral_notify,
1327 };
1328
1329 static const struct config_item_type nvmet_referrals_type = {
1330         .ct_owner       = THIS_MODULE,
1331         .ct_group_ops   = &nvmet_referral_group_ops,
1332 };
1333
1334 static struct nvmet_type_name_map nvmet_ana_state[] = {
1335         { NVME_ANA_OPTIMIZED,           "optimized" },
1336         { NVME_ANA_NONOPTIMIZED,        "non-optimized" },
1337         { NVME_ANA_INACCESSIBLE,        "inaccessible" },
1338         { NVME_ANA_PERSISTENT_LOSS,     "persistent-loss" },
1339         { NVME_ANA_CHANGE,              "change" },
1340 };
1341
1342 static ssize_t nvmet_ana_group_ana_state_show(struct config_item *item,
1343                 char *page)
1344 {
1345         struct nvmet_ana_group *grp = to_ana_group(item);
1346         enum nvme_ana_state state = grp->port->ana_state[grp->grpid];
1347         int i;
1348
1349         for (i = 0; i < ARRAY_SIZE(nvmet_ana_state); i++) {
1350                 if (state == nvmet_ana_state[i].type)
1351                         return sprintf(page, "%s\n", nvmet_ana_state[i].name);
1352         }
1353
1354         return sprintf(page, "\n");
1355 }
1356
1357 static ssize_t nvmet_ana_group_ana_state_store(struct config_item *item,
1358                 const char *page, size_t count)
1359 {
1360         struct nvmet_ana_group *grp = to_ana_group(item);
1361         enum nvme_ana_state *ana_state = grp->port->ana_state;
1362         int i;
1363
1364         for (i = 0; i < ARRAY_SIZE(nvmet_ana_state); i++) {
1365                 if (sysfs_streq(page, nvmet_ana_state[i].name))
1366                         goto found;
1367         }
1368
1369         pr_err("Invalid value '%s' for ana_state\n", page);
1370         return -EINVAL;
1371
1372 found:
1373         down_write(&nvmet_ana_sem);
1374         ana_state[grp->grpid] = (enum nvme_ana_state) nvmet_ana_state[i].type;
1375         nvmet_ana_chgcnt++;
1376         up_write(&nvmet_ana_sem);
1377         nvmet_port_send_ana_event(grp->port);
1378         return count;
1379 }
1380
1381 CONFIGFS_ATTR(nvmet_ana_group_, ana_state);
1382
1383 static struct configfs_attribute *nvmet_ana_group_attrs[] = {
1384         &nvmet_ana_group_attr_ana_state,
1385         NULL,
1386 };
1387
1388 static void nvmet_ana_group_release(struct config_item *item)
1389 {
1390         struct nvmet_ana_group *grp = to_ana_group(item);
1391
1392         if (grp == &grp->port->ana_default_group)
1393                 return;
1394
1395         down_write(&nvmet_ana_sem);
1396         grp->port->ana_state[grp->grpid] = NVME_ANA_INACCESSIBLE;
1397         nvmet_ana_group_enabled[grp->grpid]--;
1398         up_write(&nvmet_ana_sem);
1399
1400         nvmet_port_send_ana_event(grp->port);
1401         kfree(grp);
1402 }
1403
1404 static struct configfs_item_operations nvmet_ana_group_item_ops = {
1405         .release                = nvmet_ana_group_release,
1406 };
1407
1408 static const struct config_item_type nvmet_ana_group_type = {
1409         .ct_item_ops            = &nvmet_ana_group_item_ops,
1410         .ct_attrs               = nvmet_ana_group_attrs,
1411         .ct_owner               = THIS_MODULE,
1412 };
1413
1414 static struct config_group *nvmet_ana_groups_make_group(
1415                 struct config_group *group, const char *name)
1416 {
1417         struct nvmet_port *port = ana_groups_to_port(&group->cg_item);
1418         struct nvmet_ana_group *grp;
1419         u32 grpid;
1420         int ret;
1421
1422         ret = kstrtou32(name, 0, &grpid);
1423         if (ret)
1424                 goto out;
1425
1426         ret = -EINVAL;
1427         if (grpid <= 1 || grpid > NVMET_MAX_ANAGRPS)
1428                 goto out;
1429
1430         ret = -ENOMEM;
1431         grp = kzalloc(sizeof(*grp), GFP_KERNEL);
1432         if (!grp)
1433                 goto out;
1434         grp->port = port;
1435         grp->grpid = grpid;
1436
1437         down_write(&nvmet_ana_sem);
1438         nvmet_ana_group_enabled[grpid]++;
1439         up_write(&nvmet_ana_sem);
1440
1441         nvmet_port_send_ana_event(grp->port);
1442
1443         config_group_init_type_name(&grp->group, name, &nvmet_ana_group_type);
1444         return &grp->group;
1445 out:
1446         return ERR_PTR(ret);
1447 }
1448
1449 static struct configfs_group_operations nvmet_ana_groups_group_ops = {
1450         .make_group             = nvmet_ana_groups_make_group,
1451 };
1452
1453 static const struct config_item_type nvmet_ana_groups_type = {
1454         .ct_group_ops           = &nvmet_ana_groups_group_ops,
1455         .ct_owner               = THIS_MODULE,
1456 };
1457
1458 /*
1459  * Ports definitions.
1460  */
1461 static void nvmet_port_release(struct config_item *item)
1462 {
1463         struct nvmet_port *port = to_nvmet_port(item);
1464
1465         list_del(&port->global_entry);
1466
1467         kfree(port->ana_state);
1468         kfree(port);
1469 }
1470
1471 static struct configfs_attribute *nvmet_port_attrs[] = {
1472         &nvmet_attr_addr_adrfam,
1473         &nvmet_attr_addr_treq,
1474         &nvmet_attr_addr_traddr,
1475         &nvmet_attr_addr_trsvcid,
1476         &nvmet_attr_addr_trtype,
1477         &nvmet_attr_param_inline_data_size,
1478 #ifdef CONFIG_BLK_DEV_INTEGRITY
1479         &nvmet_attr_param_pi_enable,
1480 #endif
1481         NULL,
1482 };
1483
1484 static struct configfs_item_operations nvmet_port_item_ops = {
1485         .release                = nvmet_port_release,
1486 };
1487
1488 static const struct config_item_type nvmet_port_type = {
1489         .ct_attrs               = nvmet_port_attrs,
1490         .ct_item_ops            = &nvmet_port_item_ops,
1491         .ct_owner               = THIS_MODULE,
1492 };
1493
1494 static struct config_group *nvmet_ports_make(struct config_group *group,
1495                 const char *name)
1496 {
1497         struct nvmet_port *port;
1498         u16 portid;
1499         u32 i;
1500
1501         if (kstrtou16(name, 0, &portid))
1502                 return ERR_PTR(-EINVAL);
1503
1504         port = kzalloc(sizeof(*port), GFP_KERNEL);
1505         if (!port)
1506                 return ERR_PTR(-ENOMEM);
1507
1508         port->ana_state = kcalloc(NVMET_MAX_ANAGRPS + 1,
1509                         sizeof(*port->ana_state), GFP_KERNEL);
1510         if (!port->ana_state) {
1511                 kfree(port);
1512                 return ERR_PTR(-ENOMEM);
1513         }
1514
1515         for (i = 1; i <= NVMET_MAX_ANAGRPS; i++) {
1516                 if (i == NVMET_DEFAULT_ANA_GRPID)
1517                         port->ana_state[1] = NVME_ANA_OPTIMIZED;
1518                 else
1519                         port->ana_state[i] = NVME_ANA_INACCESSIBLE;
1520         }
1521
1522         list_add(&port->global_entry, &nvmet_ports_list);
1523
1524         INIT_LIST_HEAD(&port->entry);
1525         INIT_LIST_HEAD(&port->subsystems);
1526         INIT_LIST_HEAD(&port->referrals);
1527         port->inline_data_size = -1;    /* < 0 == let the transport choose */
1528
1529         port->disc_addr.portid = cpu_to_le16(portid);
1530         port->disc_addr.adrfam = NVMF_ADDR_FAMILY_MAX;
1531         port->disc_addr.treq = NVMF_TREQ_DISABLE_SQFLOW;
1532         config_group_init_type_name(&port->group, name, &nvmet_port_type);
1533
1534         config_group_init_type_name(&port->subsys_group,
1535                         "subsystems", &nvmet_port_subsys_type);
1536         configfs_add_default_group(&port->subsys_group, &port->group);
1537
1538         config_group_init_type_name(&port->referrals_group,
1539                         "referrals", &nvmet_referrals_type);
1540         configfs_add_default_group(&port->referrals_group, &port->group);
1541
1542         config_group_init_type_name(&port->ana_groups_group,
1543                         "ana_groups", &nvmet_ana_groups_type);
1544         configfs_add_default_group(&port->ana_groups_group, &port->group);
1545
1546         port->ana_default_group.port = port;
1547         port->ana_default_group.grpid = NVMET_DEFAULT_ANA_GRPID;
1548         config_group_init_type_name(&port->ana_default_group.group,
1549                         __stringify(NVMET_DEFAULT_ANA_GRPID),
1550                         &nvmet_ana_group_type);
1551         configfs_add_default_group(&port->ana_default_group.group,
1552                         &port->ana_groups_group);
1553
1554         return &port->group;
1555 }
1556
1557 static struct configfs_group_operations nvmet_ports_group_ops = {
1558         .make_group             = nvmet_ports_make,
1559 };
1560
1561 static const struct config_item_type nvmet_ports_type = {
1562         .ct_group_ops           = &nvmet_ports_group_ops,
1563         .ct_owner               = THIS_MODULE,
1564 };
1565
1566 static struct config_group nvmet_subsystems_group;
1567 static struct config_group nvmet_ports_group;
1568
1569 static void nvmet_host_release(struct config_item *item)
1570 {
1571         struct nvmet_host *host = to_host(item);
1572
1573         kfree(host);
1574 }
1575
1576 static struct configfs_item_operations nvmet_host_item_ops = {
1577         .release                = nvmet_host_release,
1578 };
1579
1580 static const struct config_item_type nvmet_host_type = {
1581         .ct_item_ops            = &nvmet_host_item_ops,
1582         .ct_owner               = THIS_MODULE,
1583 };
1584
1585 static struct config_group *nvmet_hosts_make_group(struct config_group *group,
1586                 const char *name)
1587 {
1588         struct nvmet_host *host;
1589
1590         host = kzalloc(sizeof(*host), GFP_KERNEL);
1591         if (!host)
1592                 return ERR_PTR(-ENOMEM);
1593
1594         config_group_init_type_name(&host->group, name, &nvmet_host_type);
1595
1596         return &host->group;
1597 }
1598
1599 static struct configfs_group_operations nvmet_hosts_group_ops = {
1600         .make_group             = nvmet_hosts_make_group,
1601 };
1602
1603 static const struct config_item_type nvmet_hosts_type = {
1604         .ct_group_ops           = &nvmet_hosts_group_ops,
1605         .ct_owner               = THIS_MODULE,
1606 };
1607
1608 static struct config_group nvmet_hosts_group;
1609
1610 static const struct config_item_type nvmet_root_type = {
1611         .ct_owner               = THIS_MODULE,
1612 };
1613
1614 static struct configfs_subsystem nvmet_configfs_subsystem = {
1615         .su_group = {
1616                 .cg_item = {
1617                         .ci_namebuf     = "nvmet",
1618                         .ci_type        = &nvmet_root_type,
1619                 },
1620         },
1621 };
1622
1623 int __init nvmet_init_configfs(void)
1624 {
1625         int ret;
1626
1627         config_group_init(&nvmet_configfs_subsystem.su_group);
1628         mutex_init(&nvmet_configfs_subsystem.su_mutex);
1629
1630         config_group_init_type_name(&nvmet_subsystems_group,
1631                         "subsystems", &nvmet_subsystems_type);
1632         configfs_add_default_group(&nvmet_subsystems_group,
1633                         &nvmet_configfs_subsystem.su_group);
1634
1635         config_group_init_type_name(&nvmet_ports_group,
1636                         "ports", &nvmet_ports_type);
1637         configfs_add_default_group(&nvmet_ports_group,
1638                         &nvmet_configfs_subsystem.su_group);
1639
1640         config_group_init_type_name(&nvmet_hosts_group,
1641                         "hosts", &nvmet_hosts_type);
1642         configfs_add_default_group(&nvmet_hosts_group,
1643                         &nvmet_configfs_subsystem.su_group);
1644
1645         ret = configfs_register_subsystem(&nvmet_configfs_subsystem);
1646         if (ret) {
1647                 pr_err("configfs_register_subsystem: %d\n", ret);
1648                 return ret;
1649         }
1650
1651         return 0;
1652 }
1653
1654 void __exit nvmet_exit_configfs(void)
1655 {
1656         configfs_unregister_subsystem(&nvmet_configfs_subsystem);
1657 }