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 (nvmet_is_port_enabled(port, __func__))
 270                 return -EACCES;
 271
 272         port->pi_enable = val;
 273         return count;
 274 }
 275
 276 CONFIGFS_ATTR(nvmet_, param_pi_enable);
 277 #endif
 278
 279 static ssize_t nvmet_addr_trtype_show(struct config_item *item,
 280                 char *page)
 281 {
 282         struct nvmet_port *port = to_nvmet_port(item);
 283         int i;
 284
 285         for (i = 0; i < ARRAY_SIZE(nvmet_transport); i++) {
 286                 if (port->disc_addr.trtype == nvmet_transport[i].type)
 287                         return sprintf(page, "%s\n", nvmet_transport[i].name);
 288         }
 289
 290         return sprintf(page, "\n");
 291 }
 292
 293 static void nvmet_port_init_tsas_rdma(struct nvmet_port *port)
 294 {
 295         port->disc_addr.tsas.rdma.qptype = NVMF_RDMA_QPTYPE_CONNECTED;
 296         port->disc_addr.tsas.rdma.prtype = NVMF_RDMA_PRTYPE_NOT_SPECIFIED;
 297         port->disc_addr.tsas.rdma.cms = NVMF_RDMA_CMS_RDMA_CM;
 298 }
 299
 300 static ssize_t nvmet_addr_trtype_store(struct config_item *item,
 301                 const char *page, size_t count)
 302 {
 303         struct nvmet_port *port = to_nvmet_port(item);
 304         int i;
 305
 306         if (nvmet_is_port_enabled(port, __func__))
 307                 return -EACCES;
 308
 309         for (i = 0; i < ARRAY_SIZE(nvmet_transport); i++) {
 310                 if (sysfs_streq(page, nvmet_transport[i].name))
 311                         goto found;
 312         }
 313
 314         pr_err("Invalid value '%s' for trtype\n", page);
 315         return -EINVAL;
 316
 317 found:
 318         memset(&port->disc_addr.tsas, 0, NVMF_TSAS_SIZE);
 319         port->disc_addr.trtype = nvmet_transport[i].type;
 320         if (port->disc_addr.trtype == NVMF_TRTYPE_RDMA)
 321                 nvmet_port_init_tsas_rdma(port);
 322         return count;
 323 }
 324
 325 CONFIGFS_ATTR(nvmet_, addr_trtype);
 326
 327 /*
 328  * Namespace structures & file operation functions below
 329  */
 330 static ssize_t nvmet_ns_device_path_show(struct config_item *item, char *page)
 331 {
 332         return sprintf(page, "%s\n", to_nvmet_ns(item)->device_path);
 333 }
 334
 335 static ssize_t nvmet_ns_device_path_store(struct config_item *item,
 336                 const char *page, size_t count)
 337 {
 338         struct nvmet_ns *ns = to_nvmet_ns(item);
 339         struct nvmet_subsys *subsys = ns->subsys;
 340         size_t len;
 341         int ret;
 342
 343         mutex_lock(&subsys->lock);
 344         ret = -EBUSY;
 345         if (ns->enabled)
 346                 goto out_unlock;
 347
 348         ret = -EINVAL;
 349         len = strcspn(page, "\n");
 350         if (!len)
 351                 goto out_unlock;
 352
 353         kfree(ns->device_path);
 354         ret = -ENOMEM;
 355         ns->device_path = kmemdup_nul(page, len, GFP_KERNEL);
 356         if (!ns->device_path)
 357                 goto out_unlock;
 358
 359         mutex_unlock(&subsys->lock);
 360         return count;
 361
 362 out_unlock:
 363         mutex_unlock(&subsys->lock);
 364         return ret;
 365 }
 366
 367 CONFIGFS_ATTR(nvmet_ns_, device_path);
 368
 369 #ifdef CONFIG_PCI_P2PDMA
 370 static ssize_t nvmet_ns_p2pmem_show(struct config_item *item, char *page)
 371 {
 372         struct nvmet_ns *ns = to_nvmet_ns(item);
 373
 374         return pci_p2pdma_enable_show(page, ns->p2p_dev, ns->use_p2pmem);
 375 }
 376
 377 static ssize_t nvmet_ns_p2pmem_store(struct config_item *item,
 378                 const char *page, size_t count)
 379 {
 380         struct nvmet_ns *ns = to_nvmet_ns(item);
 381         struct pci_dev *p2p_dev = NULL;
 382         bool use_p2pmem;
 383         int ret = count;
 384         int error;
 385
 386         mutex_lock(&ns->subsys->lock);
 387         if (ns->enabled) {
 388                 ret = -EBUSY;
 389                 goto out_unlock;
 390         }
 391
 392         error = pci_p2pdma_enable_store(page, &p2p_dev, &use_p2pmem);
 393         if (error) {
 394                 ret = error;
 395                 goto out_unlock;
 396         }
 397
 398         ns->use_p2pmem = use_p2pmem;
 399         pci_dev_put(ns->p2p_dev);
 400         ns->p2p_dev = p2p_dev;
 401
 402 out_unlock:
 403         mutex_unlock(&ns->subsys->lock);
 404
 405         return ret;
 406 }
 407
 408 CONFIGFS_ATTR(nvmet_ns_, p2pmem);
 409 #endif /* CONFIG_PCI_P2PDMA */
 410
 411 static ssize_t nvmet_ns_device_uuid_show(struct config_item *item, char *page)
 412 {
 413         return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->uuid);
 414 }
 415
 416 static ssize_t nvmet_ns_device_uuid_store(struct config_item *item,
 417                                           const char *page, size_t count)
 418 {
 419         struct nvmet_ns *ns = to_nvmet_ns(item);
 420         struct nvmet_subsys *subsys = ns->subsys;
 421         int ret = 0;
 422
 423         mutex_lock(&subsys->lock);
 424         if (ns->enabled) {
 425                 ret = -EBUSY;
 426                 goto out_unlock;
 427         }
 428
 429         if (uuid_parse(page, &ns->uuid))
 430                 ret = -EINVAL;
 431
 432 out_unlock:
 433         mutex_unlock(&subsys->lock);
 434         return ret ? ret : count;
 435 }
 436
 437 CONFIGFS_ATTR(nvmet_ns_, device_uuid);
 438
 439 static ssize_t nvmet_ns_device_nguid_show(struct config_item *item, char *page)
 440 {
 441         return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->nguid);
 442 }
 443
 444 static ssize_t nvmet_ns_device_nguid_store(struct config_item *item,
 445                 const char *page, size_t count)
 446 {
 447         struct nvmet_ns *ns = to_nvmet_ns(item);
 448         struct nvmet_subsys *subsys = ns->subsys;
 449         u8 nguid[16];
 450         const char *p = page;
 451         int i;
 452         int ret = 0;
 453
 454         mutex_lock(&subsys->lock);
 455         if (ns->enabled) {
 456                 ret = -EBUSY;
 457                 goto out_unlock;
 458         }
 459
 460         for (i = 0; i < 16; i++) {
 461                 if (p + 2 > page + count) {
 462                         ret = -EINVAL;
 463                         goto out_unlock;
 464                 }
 465                 if (!isxdigit(p[0]) || !isxdigit(p[1])) {
 466                         ret = -EINVAL;
 467                         goto out_unlock;
 468                 }
 469
 470                 nguid[i] = (hex_to_bin(p[0]) << 4) | hex_to_bin(p[1]);
 471                 p += 2;
 472
 473                 if (*p == '-' || *p == ':')
 474                         p++;
 475         }
 476
 477         memcpy(&ns->nguid, nguid, sizeof(nguid));
 478 out_unlock:
 479         mutex_unlock(&subsys->lock);
 480         return ret ? ret : count;
 481 }
 482
 483 CONFIGFS_ATTR(nvmet_ns_, device_nguid);
 484
 485 static ssize_t nvmet_ns_ana_grpid_show(struct config_item *item, char *page)
 486 {
 487         return sprintf(page, "%u\n", to_nvmet_ns(item)->anagrpid);
 488 }
 489
 490 static ssize_t nvmet_ns_ana_grpid_store(struct config_item *item,
 491                 const char *page, size_t count)
 492 {
 493         struct nvmet_ns *ns = to_nvmet_ns(item);
 494         u32 oldgrpid, newgrpid;
 495         int ret;
 496
 497         ret = kstrtou32(page, 0, &newgrpid);
 498         if (ret)
 499                 return ret;
 500
 501         if (newgrpid < 1 || newgrpid > NVMET_MAX_ANAGRPS)
 502                 return -EINVAL;
 503
 504         down_write(&nvmet_ana_sem);
 505         oldgrpid = ns->anagrpid;
 506         nvmet_ana_group_enabled[newgrpid]++;
 507         ns->anagrpid = newgrpid;
 508         nvmet_ana_group_enabled[oldgrpid]--;
 509         nvmet_ana_chgcnt++;
 510         up_write(&nvmet_ana_sem);
 511
 512         nvmet_send_ana_event(ns->subsys, NULL);
 513         return count;
 514 }
 515
 516 CONFIGFS_ATTR(nvmet_ns_, ana_grpid);
 517
 518 static ssize_t nvmet_ns_enable_show(struct config_item *item, char *page)
 519 {
 520         return sprintf(page, "%d\n", to_nvmet_ns(item)->enabled);
 521 }
 522
 523 static ssize_t nvmet_ns_enable_store(struct config_item *item,
 524                 const char *page, size_t count)
 525 {
 526         struct nvmet_ns *ns = to_nvmet_ns(item);
 527         bool enable;
 528         int ret = 0;
 529
 530         if (strtobool(page, &enable))
 531                 return -EINVAL;
 532
 533         if (enable)
 534                 ret = nvmet_ns_enable(ns);
 535         else
 536                 nvmet_ns_disable(ns);
 537
 538         return ret ? ret : count;
 539 }
 540
 541 CONFIGFS_ATTR(nvmet_ns_, enable);
 542
 543 static ssize_t nvmet_ns_buffered_io_show(struct config_item *item, char *page)
 544 {
 545         return sprintf(page, "%d\n", to_nvmet_ns(item)->buffered_io);
 546 }
 547
 548 static ssize_t nvmet_ns_buffered_io_store(struct config_item *item,
 549                 const char *page, size_t count)
 550 {
 551         struct nvmet_ns *ns = to_nvmet_ns(item);
 552         bool val;
 553
 554         if (strtobool(page, &val))
 555                 return -EINVAL;
 556
 557         mutex_lock(&ns->subsys->lock);
 558         if (ns->enabled) {
 559                 pr_err("disable ns before setting buffered_io value.\n");
 560                 mutex_unlock(&ns->subsys->lock);
 561                 return -EINVAL;
 562         }
 563
 564         ns->buffered_io = val;
 565         mutex_unlock(&ns->subsys->lock);
 566         return count;
 567 }
 568
 569 CONFIGFS_ATTR(nvmet_ns_, buffered_io);
 570
 571 static ssize_t nvmet_ns_revalidate_size_store(struct config_item *item,
 572                 const char *page, size_t count)
 573 {
 574         struct nvmet_ns *ns = to_nvmet_ns(item);
 575         bool val;
 576
 577         if (strtobool(page, &val))
 578                 return -EINVAL;
 579
 580         if (!val)
 581                 return -EINVAL;
 582
 583         mutex_lock(&ns->subsys->lock);
 584         if (!ns->enabled) {
 585                 pr_err("enable ns before revalidate.\n");
 586                 mutex_unlock(&ns->subsys->lock);
 587                 return -EINVAL;
 588         }
 589         nvmet_ns_revalidate(ns);
 590         mutex_unlock(&ns->subsys->lock);
 591         return count;
 592 }
 593
 594 CONFIGFS_ATTR_WO(nvmet_ns_, revalidate_size);
 595
 596 static struct configfs_attribute *nvmet_ns_attrs[] = {
 597         &nvmet_ns_attr_device_path,
 598         &nvmet_ns_attr_device_nguid,
 599         &nvmet_ns_attr_device_uuid,
 600         &nvmet_ns_attr_ana_grpid,
 601         &nvmet_ns_attr_enable,
 602         &nvmet_ns_attr_buffered_io,
 603         &nvmet_ns_attr_revalidate_size,
 604 #ifdef CONFIG_PCI_P2PDMA
 605         &nvmet_ns_attr_p2pmem,
 606 #endif
 607         NULL,
 608 };
 609
 610 static void nvmet_ns_release(struct config_item *item)
 611 {
 612         struct nvmet_ns *ns = to_nvmet_ns(item);
 613
 614         nvmet_ns_free(ns);
 615 }
 616
 617 static struct configfs_item_operations nvmet_ns_item_ops = {
 618         .release                = nvmet_ns_release,
 619 };
 620
 621 static const struct config_item_type nvmet_ns_type = {
 622         .ct_item_ops            = &nvmet_ns_item_ops,
 623         .ct_attrs               = nvmet_ns_attrs,
 624         .ct_owner               = THIS_MODULE,
 625 };
 626
 627 static struct config_group *nvmet_ns_make(struct config_group *group,
 628                 const char *name)
 629 {
 630         struct nvmet_subsys *subsys = namespaces_to_subsys(&group->cg_item);
 631         struct nvmet_ns *ns;
 632         int ret;
 633         u32 nsid;
 634
 635         ret = kstrtou32(name, 0, &nsid);
 636         if (ret)
 637                 goto out;
 638
 639         ret = -EINVAL;
 640         if (nsid == 0 || nsid == NVME_NSID_ALL) {
 641                 pr_err("invalid nsid %#x", nsid);
 642                 goto out;
 643         }
 644
 645         ret = -ENOMEM;
 646         ns = nvmet_ns_alloc(subsys, nsid);
 647         if (!ns)
 648                 goto out;
 649         config_group_init_type_name(&ns->group, name, &nvmet_ns_type);
 650
 651         pr_info("adding nsid %d to subsystem %s\n", nsid, subsys->subsysnqn);
 652
 653         return &ns->group;
 654 out:
 655         return ERR_PTR(ret);
 656 }
 657
 658 static struct configfs_group_operations nvmet_namespaces_group_ops = {
 659         .make_group             = nvmet_ns_make,
 660 };
 661
 662 static const struct config_item_type nvmet_namespaces_type = {
 663         .ct_group_ops           = &nvmet_namespaces_group_ops,
 664         .ct_owner               = THIS_MODULE,
 665 };
 666
 667 #ifdef CONFIG_NVME_TARGET_PASSTHRU
 668
 669 static ssize_t nvmet_passthru_device_path_show(struct config_item *item,
 670                 char *page)
 671 {
 672         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 673
 674         return snprintf(page, PAGE_SIZE, "%s\n", subsys->passthru_ctrl_path);
 675 }
 676
 677 static ssize_t nvmet_passthru_device_path_store(struct config_item *item,
 678                 const char *page, size_t count)
 679 {
 680         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 681         size_t len;
 682         int ret;
 683
 684         mutex_lock(&subsys->lock);
 685
 686         ret = -EBUSY;
 687         if (subsys->passthru_ctrl)
 688                 goto out_unlock;
 689
 690         ret = -EINVAL;
 691         len = strcspn(page, "\n");
 692         if (!len)
 693                 goto out_unlock;
 694
 695         kfree(subsys->passthru_ctrl_path);
 696         ret = -ENOMEM;
 697         subsys->passthru_ctrl_path = kstrndup(page, len, GFP_KERNEL);
 698         if (!subsys->passthru_ctrl_path)
 699                 goto out_unlock;
 700
 701         mutex_unlock(&subsys->lock);
 702
 703         return count;
 704 out_unlock:
 705         mutex_unlock(&subsys->lock);
 706         return ret;
 707 }
 708 CONFIGFS_ATTR(nvmet_passthru_, device_path);
 709
 710 static ssize_t nvmet_passthru_enable_show(struct config_item *item,
 711                 char *page)
 712 {
 713         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 714
 715         return sprintf(page, "%d\n", subsys->passthru_ctrl ? 1 : 0);
 716 }
 717
 718 static ssize_t nvmet_passthru_enable_store(struct config_item *item,
 719                 const char *page, size_t count)
 720 {
 721         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 722         bool enable;
 723         int ret = 0;
 724
 725         if (strtobool(page, &enable))
 726                 return -EINVAL;
 727
 728         if (enable)
 729                 ret = nvmet_passthru_ctrl_enable(subsys);
 730         else
 731                 nvmet_passthru_ctrl_disable(subsys);
 732
 733         return ret ? ret : count;
 734 }
 735 CONFIGFS_ATTR(nvmet_passthru_, enable);
 736
 737 static ssize_t nvmet_passthru_admin_timeout_show(struct config_item *item,
 738                 char *page)
 739 {
 740         return sprintf(page, "%u\n", to_subsys(item->ci_parent)->admin_timeout);
 741 }
 742
 743 static ssize_t nvmet_passthru_admin_timeout_store(struct config_item *item,
 744                 const char *page, size_t count)
 745 {
 746         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 747         unsigned int timeout;
 748
 749         if (kstrtouint(page, 0, &timeout))
 750                 return -EINVAL;
 751         subsys->admin_timeout = timeout;
 752         return count;
 753 }
 754 CONFIGFS_ATTR(nvmet_passthru_, admin_timeout);
 755
 756 static ssize_t nvmet_passthru_io_timeout_show(struct config_item *item,
 757                 char *page)
 758 {
 759         return sprintf(page, "%u\n", to_subsys(item->ci_parent)->io_timeout);
 760 }
 761
 762 static ssize_t nvmet_passthru_io_timeout_store(struct config_item *item,
 763                 const char *page, size_t count)
 764 {
 765         struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
 766         unsigned int timeout;
 767
 768         if (kstrtouint(page, 0, &timeout))
 769                 return -EINVAL;
 770         subsys->io_timeout = timeout;
 771         return count;
 772 }
 773 CONFIGFS_ATTR(nvmet_passthru_, io_timeout);
 774
 775 static struct configfs_attribute *nvmet_passthru_attrs[] = {
 776         &nvmet_passthru_attr_device_path,
 777         &nvmet_passthru_attr_enable,
 778         &nvmet_passthru_attr_admin_timeout,
 779         &nvmet_passthru_attr_io_timeout,
 780         NULL,
 781 };
 782
 783 static const struct config_item_type nvmet_passthru_type = {
 784         .ct_attrs               = nvmet_passthru_attrs,
 785         .ct_owner               = THIS_MODULE,
 786 };
 787
 788 static void nvmet_add_passthru_group(struct nvmet_subsys *subsys)
 789 {
 790         config_group_init_type_name(&subsys->passthru_group,
 791                                     "passthru", &nvmet_passthru_type);
 792         configfs_add_default_group(&subsys->passthru_group,
 793                                    &subsys->group);
 794 }
 795
 796 #else /* CONFIG_NVME_TARGET_PASSTHRU */
 797
 798 static void nvmet_add_passthru_group(struct nvmet_subsys *subsys)
 799 {
 800 }
 801
 802 #endif /* CONFIG_NVME_TARGET_PASSTHRU */
 803
 804 static int nvmet_port_subsys_allow_link(struct config_item *parent,
 805                 struct config_item *target)
 806 {
 807         struct nvmet_port *port = to_nvmet_port(parent->ci_parent);
 808         struct nvmet_subsys *subsys;
 809         struct nvmet_subsys_link *link, *p;
 810         int ret;
 811
 812         if (target->ci_type != &nvmet_subsys_type) {
 813                 pr_err("can only link subsystems into the subsystems dir.!\n");
 814                 return -EINVAL;
 815         }
 816         subsys = to_subsys(target);
 817         link = kmalloc(sizeof(*link), GFP_KERNEL);
 818         if (!link)
 819                 return -ENOMEM;
 820         link->subsys = subsys;
 821
 822         down_write(&nvmet_config_sem);
 823         ret = -EEXIST;
 824         list_for_each_entry(p, &port->subsystems, entry) {
 825                 if (p->subsys == subsys)
 826                         goto out_free_link;
 827         }
 828
 829         if (list_empty(&port->subsystems)) {
 830                 ret = nvmet_enable_port(port);
 831                 if (ret)
 832                         goto out_free_link;
 833         }
 834
 835         list_add_tail(&link->entry, &port->subsystems);
 836         nvmet_port_disc_changed(port, subsys);
 837
 838         up_write(&nvmet_config_sem);
 839         return 0;
 840
 841 out_free_link:
 842         up_write(&nvmet_config_sem);
 843         kfree(link);
 844         return ret;
 845 }
 846
 847 static void nvmet_port_subsys_drop_link(struct config_item *parent,
 848                 struct config_item *target)
 849 {
 850         struct nvmet_port *port = to_nvmet_port(parent->ci_parent);
 851         struct nvmet_subsys *subsys = to_subsys(target);
 852         struct nvmet_subsys_link *p;
 853
 854         down_write(&nvmet_config_sem);
 855         list_for_each_entry(p, &port->subsystems, entry) {
 856                 if (p->subsys == subsys)
 857                         goto found;
 858         }
 859         up_write(&nvmet_config_sem);
 860         return;
 861
 862 found:
 863         list_del(&p->entry);
 864         nvmet_port_del_ctrls(port, subsys);
 865         nvmet_port_disc_changed(port, subsys);
 866
 867         if (list_empty(&port->subsystems))
 868                 nvmet_disable_port(port);
 869         up_write(&nvmet_config_sem);
 870         kfree(p);
 871 }
 872
 873 static struct configfs_item_operations nvmet_port_subsys_item_ops = {
 874         .allow_link             = nvmet_port_subsys_allow_link,
 875         .drop_link              = nvmet_port_subsys_drop_link,
 876 };
 877
 878 static const struct config_item_type nvmet_port_subsys_type = {
 879         .ct_item_ops            = &nvmet_port_subsys_item_ops,
 880         .ct_owner               = THIS_MODULE,
 881 };
 882
 883 static int nvmet_allowed_hosts_allow_link(struct config_item *parent,
 884                 struct config_item *target)
 885 {
 886         struct nvmet_subsys *subsys = to_subsys(parent->ci_parent);
 887         struct nvmet_host *host;
 888         struct nvmet_host_link *link, *p;
 889         int ret;
 890
 891         if (target->ci_type != &nvmet_host_type) {
 892                 pr_err("can only link hosts into the allowed_hosts directory!\n");
 893                 return -EINVAL;
 894         }
 895
 896         host = to_host(target);
 897         link = kmalloc(sizeof(*link), GFP_KERNEL);
 898         if (!link)
 899                 return -ENOMEM;
 900         link->host = host;
 901
 902         down_write(&nvmet_config_sem);
 903         ret = -EINVAL;
 904         if (subsys->allow_any_host) {
 905                 pr_err("can't add hosts when allow_any_host is set!\n");
 906                 goto out_free_link;
 907         }
 908
 909         ret = -EEXIST;
 910         list_for_each_entry(p, &subsys->hosts, entry) {
 911                 if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host)))
 912                         goto out_free_link;
 913         }
 914         list_add_tail(&link->entry, &subsys->hosts);
 915         nvmet_subsys_disc_changed(subsys, host);
 916
 917         up_write(&nvmet_config_sem);
 918         return 0;
 919 out_free_link:
 920         up_write(&nvmet_config_sem);
 921         kfree(link);
 922         return ret;
 923 }
 924
 925 static void nvmet_allowed_hosts_drop_link(struct config_item *parent,
 926                 struct config_item *target)
 927 {
 928         struct nvmet_subsys *subsys = to_subsys(parent->ci_parent);
 929         struct nvmet_host *host = to_host(target);
 930         struct nvmet_host_link *p;
 931
 932         down_write(&nvmet_config_sem);
 933         list_for_each_entry(p, &subsys->hosts, entry) {
 934                 if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host)))
 935                         goto found;
 936         }
 937         up_write(&nvmet_config_sem);
 938         return;
 939
 940 found:
 941         list_del(&p->entry);
 942         nvmet_subsys_disc_changed(subsys, host);
 943
 944         up_write(&nvmet_config_sem);
 945         kfree(p);
 946 }
 947
 948 static struct configfs_item_operations nvmet_allowed_hosts_item_ops = {
 949         .allow_link             = nvmet_allowed_hosts_allow_link,
 950         .drop_link              = nvmet_allowed_hosts_drop_link,
 951 };
 952
 953 static const struct config_item_type nvmet_allowed_hosts_type = {
 954         .ct_item_ops            = &nvmet_allowed_hosts_item_ops,
 955         .ct_owner               = THIS_MODULE,
 956 };
 957
 958 static ssize_t nvmet_subsys_attr_allow_any_host_show(struct config_item *item,
 959                 char *page)
 960 {
 961         return snprintf(page, PAGE_SIZE, "%d\n",
 962                 to_subsys(item)->allow_any_host);
 963 }
 964
 965 static ssize_t nvmet_subsys_attr_allow_any_host_store(struct config_item *item,
 966                 const char *page, size_t count)
 967 {
 968         struct nvmet_subsys *subsys = to_subsys(item);
 969         bool allow_any_host;
 970         int ret = 0;
 971
 972         if (strtobool(page, &allow_any_host))
 973                 return -EINVAL;
 974
 975         down_write(&nvmet_config_sem);
 976         if (allow_any_host && !list_empty(&subsys->hosts)) {
 977                 pr_err("Can't set allow_any_host when explicit hosts are set!\n");
 978                 ret = -EINVAL;
 979                 goto out_unlock;
 980         }
 981
 982         if (subsys->allow_any_host != allow_any_host) {
 983                 subsys->allow_any_host = allow_any_host;
 984                 nvmet_subsys_disc_changed(subsys, NULL);
 985         }
 986
 987 out_unlock:
 988         up_write(&nvmet_config_sem);
 989         return ret ? ret : count;
 990 }
 991
 992 CONFIGFS_ATTR(nvmet_subsys_, attr_allow_any_host);
 993
 994 static ssize_t nvmet_subsys_attr_version_show(struct config_item *item,
 995                                               char *page)
 996 {
 997         struct nvmet_subsys *subsys = to_subsys(item);
 998
 999         if (NVME_TERTIARY(subsys->ver))
1000                 return snprintf(page, PAGE_SIZE, "%llu.%llu.%llu\n",
1001                                 NVME_MAJOR(subsys->ver),
1002                                 NVME_MINOR(subsys->ver),
1003                                 NVME_TERTIARY(subsys->ver));
1004
1005         return snprintf(page, PAGE_SIZE, "%llu.%llu\n",
1006                         NVME_MAJOR(subsys->ver),
1007                         NVME_MINOR(subsys->ver));
1008 }
1009
1010 static ssize_t nvmet_subsys_attr_version_store(struct config_item *item,
1011                                                const char *page, size_t count)
1012 {
1013         struct nvmet_subsys *subsys = to_subsys(item);
1014         int major, minor, tertiary = 0;
1015         int ret;
1016
1017         /* passthru subsystems use the underlying controller's version */
1018         if (nvmet_passthru_ctrl(subsys))
1019                 return -EINVAL;
1020
1021         ret = sscanf(page, "%d.%d.%d\n", &major, &minor, &tertiary);
1022         if (ret != 2 && ret != 3)
1023                 return -EINVAL;
1024
1025         down_write(&nvmet_config_sem);
1026         subsys->ver = NVME_VS(major, minor, tertiary);
1027         up_write(&nvmet_config_sem);
1028
1029         return count;
1030 }
1031 CONFIGFS_ATTR(nvmet_subsys_, attr_version);
1032
1033 /* See Section 1.5 of NVMe 1.4 */
1034 static bool nvmet_is_ascii(const char c)
1035 {
1036         return c >= 0x20 && c <= 0x7e;
1037 }
1038
1039 static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item,
1040                                              char *page)
1041 {
1042         struct nvmet_subsys *subsys = to_subsys(item);
1043
1044         return snprintf(page, PAGE_SIZE, "%s\n", subsys->serial);
1045 }
1046
1047 static ssize_t
1048 nvmet_subsys_attr_serial_store_locked(struct nvmet_subsys *subsys,
1049                 const char *page, size_t count)
1050 {
1051         int pos, len = strcspn(page, "\n");
1052
1053         if (subsys->subsys_discovered) {
1054                 pr_err("Can't set serial number. %s is already assigned\n",
1055                        subsys->serial);
1056                 return -EINVAL;
1057         }
1058
1059         if (!len || len > NVMET_SN_MAX_SIZE) {
1060                 pr_err("Serial Number can not be empty or exceed %d Bytes\n",
1061                        NVMET_SN_MAX_SIZE);
1062                 return -EINVAL;
1063         }
1064
1065         for (pos = 0; pos < len; pos++) {
1066                 if (!nvmet_is_ascii(page[pos])) {
1067                         pr_err("Serial Number must contain only ASCII strings\n");
1068                         return -EINVAL;
1069                 }
1070         }
1071
1072         memcpy_and_pad(subsys->serial, NVMET_SN_MAX_SIZE, page, len, ' ');
1073
1074         return count;
1075 }
1076
1077 static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item,
1078                                               const char *page, size_t count)
1079 {
1080         struct nvmet_subsys *subsys = to_subsys(item);
1081         ssize_t ret;
1082
1083         down_write(&nvmet_config_sem);
1084         mutex_lock(&subsys->lock);
1085         ret = nvmet_subsys_attr_serial_store_locked(subsys, page, count);
1086         mutex_unlock(&subsys->lock);
1087         up_write(&nvmet_config_sem);
1088
1089         return ret;
1090 }
1091 CONFIGFS_ATTR(nvmet_subsys_, attr_serial);
1092
1093 static ssize_t nvmet_subsys_attr_cntlid_min_show(struct config_item *item,
1094                                                  char *page)
1095 {
1096         return snprintf(page, PAGE_SIZE, "%u\n", to_subsys(item)->cntlid_min);
1097 }
1098
1099 static ssize_t nvmet_subsys_attr_cntlid_min_store(struct config_item *item,
1100                                                   const char *page, size_t cnt)
1101 {
1102         u16 cntlid_min;
1103
1104         if (sscanf(page, "%hu\n", &cntlid_min) != 1)
1105                 return -EINVAL;
1106
1107         if (cntlid_min == 0)
1108                 return -EINVAL;
1109
1110         down_write(&nvmet_config_sem);
1111         if (cntlid_min >= to_subsys(item)->cntlid_max)
1112                 goto out_unlock;
1113         to_subsys(item)->cntlid_min = cntlid_min;
1114         up_write(&nvmet_config_sem);
1115         return cnt;
1116
1117 out_unlock:
1118         up_write(&nvmet_config_sem);
1119         return -EINVAL;
1120 }
1121 CONFIGFS_ATTR(nvmet_subsys_, attr_cntlid_min);
1122
1123 static ssize_t nvmet_subsys_attr_cntlid_max_show(struct config_item *item,
1124                                                  char *page)
1125 {
1126         return snprintf(page, PAGE_SIZE, "%u\n", to_subsys(item)->cntlid_max);
1127 }
1128
1129 static ssize_t nvmet_subsys_attr_cntlid_max_store(struct config_item *item,
1130                                                   const char *page, size_t cnt)
1131 {
1132         u16 cntlid_max;
1133
1134         if (sscanf(page, "%hu\n", &cntlid_max) != 1)
1135                 return -EINVAL;
1136
1137         if (cntlid_max == 0)
1138                 return -EINVAL;
1139
1140         down_write(&nvmet_config_sem);
1141         if (cntlid_max <= to_subsys(item)->cntlid_min)
1142                 goto out_unlock;
1143         to_subsys(item)->cntlid_max = cntlid_max;
1144         up_write(&nvmet_config_sem);
1145         return cnt;
1146
1147 out_unlock:
1148         up_write(&nvmet_config_sem);
1149         return -EINVAL;
1150 }
1151 CONFIGFS_ATTR(nvmet_subsys_, attr_cntlid_max);
1152
1153 static ssize_t nvmet_subsys_attr_model_show(struct config_item *item,
1154                                             char *page)
1155 {
1156         struct nvmet_subsys *subsys = to_subsys(item);
1157
1158         return snprintf(page, PAGE_SIZE, "%s\n", subsys->model_number);
1159 }
1160
1161 static ssize_t nvmet_subsys_attr_model_store_locked(struct nvmet_subsys *subsys,
1162                 const char *page, size_t count)
1163 {
1164         int pos = 0, len;
1165
1166         if (subsys->subsys_discovered) {
1167                 pr_err("Can't set model number. %s is already assigned\n",
1168                        subsys->model_number);
1169                 return -EINVAL;
1170         }
1171
1172         len = strcspn(page, "\n");
1173         if (!len)
1174                 return -EINVAL;
1175
1176         if (len > NVMET_MN_MAX_SIZE) {
1177                 pr_err("Model number size can not exceed %d Bytes\n",
1178                        NVMET_MN_MAX_SIZE);
1179                 return -EINVAL;
1180         }
1181
1182         for (pos = 0; pos < len; pos++) {
1183                 if (!nvmet_is_ascii(page[pos]))
1184                         return -EINVAL;
1185         }
1186
1187         subsys->model_number = kmemdup_nul(page, len, GFP_KERNEL);
1188         if (!subsys->model_number)
1189                 return -ENOMEM;
1190         return count;
1191 }
1192
1193 static ssize_t nvmet_subsys_attr_model_store(struct config_item *item,
1194                                              const char *page, size_t count)
1195 {
1196         struct nvmet_subsys *subsys = to_subsys(item);
1197         ssize_t ret;
1198
1199         down_write(&nvmet_config_sem);
1200         mutex_lock(&subsys->lock);
1201         ret = nvmet_subsys_attr_model_store_locked(subsys, page, count);
1202         mutex_unlock(&subsys->lock);
1203         up_write(&nvmet_config_sem);
1204
1205         return ret;
1206 }
1207 CONFIGFS_ATTR(nvmet_subsys_, attr_model);
1208
1209 #ifdef CONFIG_BLK_DEV_INTEGRITY
1210 static ssize_t nvmet_subsys_attr_pi_enable_show(struct config_item *item,
1211                                                 char *page)
1212 {
1213         return snprintf(page, PAGE_SIZE, "%d\n", to_subsys(item)->pi_support);
1214 }
1215
1216 static ssize_t nvmet_subsys_attr_pi_enable_store(struct config_item *item,
1217                                                  const char *page, size_t count)
1218 {
1219         struct nvmet_subsys *subsys = to_subsys(item);
1220         bool pi_enable;
1221
1222         if (strtobool(page, &pi_enable))
1223                 return -EINVAL;
1224
1225         subsys->pi_support = pi_enable;
1226         return count;
1227 }
1228 CONFIGFS_ATTR(nvmet_subsys_, attr_pi_enable);
1229 #endif
1230
1231 static struct configfs_attribute *nvmet_subsys_attrs[] = {
1232         &nvmet_subsys_attr_attr_allow_any_host,
1233         &nvmet_subsys_attr_attr_version,
1234         &nvmet_subsys_attr_attr_serial,
1235         &nvmet_subsys_attr_attr_cntlid_min,
1236         &nvmet_subsys_attr_attr_cntlid_max,
1237         &nvmet_subsys_attr_attr_model,
1238 #ifdef CONFIG_BLK_DEV_INTEGRITY
1239         &nvmet_subsys_attr_attr_pi_enable,
1240 #endif
1241         NULL,
1242 };
1243
1244 /*
1245  * Subsystem structures & folder operation functions below
1246  */
1247 static void nvmet_subsys_release(struct config_item *item)
1248 {
1249         struct nvmet_subsys *subsys = to_subsys(item);
1250
1251         nvmet_subsys_del_ctrls(subsys);
1252         nvmet_subsys_put(subsys);
1253 }
1254
1255 static struct configfs_item_operations nvmet_subsys_item_ops = {
1256         .release                = nvmet_subsys_release,
1257 };
1258
1259 static const struct config_item_type nvmet_subsys_type = {
1260         .ct_item_ops            = &nvmet_subsys_item_ops,
1261         .ct_attrs               = nvmet_subsys_attrs,
1262         .ct_owner               = THIS_MODULE,
1263 };
1264
1265 static struct config_group *nvmet_subsys_make(struct config_group *group,
1266                 const char *name)
1267 {
1268         struct nvmet_subsys *subsys;
1269
1270         if (sysfs_streq(name, NVME_DISC_SUBSYS_NAME)) {
1271                 pr_err("can't create discovery subsystem through configfs\n");
1272                 return ERR_PTR(-EINVAL);
1273         }
1274
1275         subsys = nvmet_subsys_alloc(name, NVME_NQN_NVME);
1276         if (IS_ERR(subsys))
1277                 return ERR_CAST(subsys);
1278
1279         config_group_init_type_name(&subsys->group, name, &nvmet_subsys_type);
1280
1281         config_group_init_type_name(&subsys->namespaces_group,
1282                         "namespaces", &nvmet_namespaces_type);
1283         configfs_add_default_group(&subsys->namespaces_group, &subsys->group);
1284
1285         config_group_init_type_name(&subsys->allowed_hosts_group,
1286                         "allowed_hosts", &nvmet_allowed_hosts_type);
1287         configfs_add_default_group(&subsys->allowed_hosts_group,
1288                         &subsys->group);
1289
1290         nvmet_add_passthru_group(subsys);
1291
1292         return &subsys->group;
1293 }
1294
1295 static struct configfs_group_operations nvmet_subsystems_group_ops = {
1296         .make_group             = nvmet_subsys_make,
1297 };
1298
1299 static const struct config_item_type nvmet_subsystems_type = {
1300         .ct_group_ops           = &nvmet_subsystems_group_ops,
1301         .ct_owner               = THIS_MODULE,
1302 };
1303
1304 static ssize_t nvmet_referral_enable_show(struct config_item *item,
1305                 char *page)
1306 {
1307         return snprintf(page, PAGE_SIZE, "%d\n", to_nvmet_port(item)->enabled);
1308 }
1309
1310 static ssize_t nvmet_referral_enable_store(struct config_item *item,
1311                 const char *page, size_t count)
1312 {
1313         struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent);
1314         struct nvmet_port *port = to_nvmet_port(item);
1315         bool enable;
1316
1317         if (strtobool(page, &enable))
1318                 goto inval;
1319
1320         if (enable)
1321                 nvmet_referral_enable(parent, port);
1322         else
1323                 nvmet_referral_disable(parent, port);
1324
1325         return count;
1326 inval:
1327         pr_err("Invalid value '%s' for enable\n", page);
1328         return -EINVAL;
1329 }
1330
1331 CONFIGFS_ATTR(nvmet_referral_, enable);
1332
1333 /*
1334  * Discovery Service subsystem definitions
1335  */
1336 static struct configfs_attribute *nvmet_referral_attrs[] = {
1337         &nvmet_attr_addr_adrfam,
1338         &nvmet_attr_addr_portid,
1339         &nvmet_attr_addr_treq,
1340         &nvmet_attr_addr_traddr,
1341         &nvmet_attr_addr_trsvcid,
1342         &nvmet_attr_addr_trtype,
1343         &nvmet_referral_attr_enable,
1344         NULL,
1345 };
1346
1347 static void nvmet_referral_notify(struct config_group *group,
1348                 struct config_item *item)
1349 {
1350         struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent);
1351         struct nvmet_port *port = to_nvmet_port(item);
1352
1353         nvmet_referral_disable(parent, port);
1354 }
1355
1356 static void nvmet_referral_release(struct config_item *item)
1357 {
1358         struct nvmet_port *port = to_nvmet_port(item);
1359
1360         kfree(port);
1361 }
1362
1363 static struct configfs_item_operations nvmet_referral_item_ops = {
1364         .release        = nvmet_referral_release,
1365 };
1366
1367 static const struct config_item_type nvmet_referral_type = {
1368         .ct_owner       = THIS_MODULE,
1369         .ct_attrs       = nvmet_referral_attrs,
1370         .ct_item_ops    = &nvmet_referral_item_ops,
1371 };
1372
1373 static struct config_group *nvmet_referral_make(
1374                 struct config_group *group, const char *name)
1375 {
1376         struct nvmet_port *port;
1377
1378         port = kzalloc(sizeof(*port), GFP_KERNEL);
1379         if (!port)
1380                 return ERR_PTR(-ENOMEM);
1381
1382         INIT_LIST_HEAD(&port->entry);
1383         config_group_init_type_name(&port->group, name, &nvmet_referral_type);
1384
1385         return &port->group;
1386 }
1387
1388 static struct configfs_group_operations nvmet_referral_group_ops = {
1389         .make_group             = nvmet_referral_make,
1390         .disconnect_notify      = nvmet_referral_notify,
1391 };
1392
1393 static const struct config_item_type nvmet_referrals_type = {
1394         .ct_owner       = THIS_MODULE,
1395         .ct_group_ops   = &nvmet_referral_group_ops,
1396 };
1397
1398 static struct nvmet_type_name_map nvmet_ana_state[] = {
1399         { NVME_ANA_OPTIMIZED,           "optimized" },
1400         { NVME_ANA_NONOPTIMIZED,        "non-optimized" },
1401         { NVME_ANA_INACCESSIBLE,        "inaccessible" },
1402         { NVME_ANA_PERSISTENT_LOSS,     "persistent-loss" },
1403         { NVME_ANA_CHANGE,              "change" },
1404 };
1405
1406 static ssize_t nvmet_ana_group_ana_state_show(struct config_item *item,
1407                 char *page)
1408 {
1409         struct nvmet_ana_group *grp = to_ana_group(item);
1410         enum nvme_ana_state state = grp->port->ana_state[grp->grpid];
1411         int i;
1412
1413         for (i = 0; i < ARRAY_SIZE(nvmet_ana_state); i++) {
1414                 if (state == nvmet_ana_state[i].type)
1415                         return sprintf(page, "%s\n", nvmet_ana_state[i].name);
1416         }
1417
1418         return sprintf(page, "\n");
1419 }
1420
1421 static ssize_t nvmet_ana_group_ana_state_store(struct config_item *item,
1422                 const char *page, size_t count)
1423 {
1424         struct nvmet_ana_group *grp = to_ana_group(item);
1425         enum nvme_ana_state *ana_state = grp->port->ana_state;
1426         int i;
1427
1428         for (i = 0; i < ARRAY_SIZE(nvmet_ana_state); i++) {
1429                 if (sysfs_streq(page, nvmet_ana_state[i].name))
1430                         goto found;
1431         }
1432
1433         pr_err("Invalid value '%s' for ana_state\n", page);
1434         return -EINVAL;
1435
1436 found:
1437         down_write(&nvmet_ana_sem);
1438         ana_state[grp->grpid] = (enum nvme_ana_state) nvmet_ana_state[i].type;
1439         nvmet_ana_chgcnt++;
1440         up_write(&nvmet_ana_sem);
1441         nvmet_port_send_ana_event(grp->port);
1442         return count;
1443 }
1444
1445 CONFIGFS_ATTR(nvmet_ana_group_, ana_state);
1446
1447 static struct configfs_attribute *nvmet_ana_group_attrs[] = {
1448         &nvmet_ana_group_attr_ana_state,
1449         NULL,
1450 };
1451
1452 static void nvmet_ana_group_release(struct config_item *item)
1453 {
1454         struct nvmet_ana_group *grp = to_ana_group(item);
1455
1456         if (grp == &grp->port->ana_default_group)
1457                 return;
1458
1459         down_write(&nvmet_ana_sem);
1460         grp->port->ana_state[grp->grpid] = NVME_ANA_INACCESSIBLE;
1461         nvmet_ana_group_enabled[grp->grpid]--;
1462         up_write(&nvmet_ana_sem);
1463
1464         nvmet_port_send_ana_event(grp->port);
1465         kfree(grp);
1466 }
1467
1468 static struct configfs_item_operations nvmet_ana_group_item_ops = {
1469         .release                = nvmet_ana_group_release,
1470 };
1471
1472 static const struct config_item_type nvmet_ana_group_type = {
1473         .ct_item_ops            = &nvmet_ana_group_item_ops,
1474         .ct_attrs               = nvmet_ana_group_attrs,
1475         .ct_owner               = THIS_MODULE,
1476 };
1477
1478 static struct config_group *nvmet_ana_groups_make_group(
1479                 struct config_group *group, const char *name)
1480 {
1481         struct nvmet_port *port = ana_groups_to_port(&group->cg_item);
1482         struct nvmet_ana_group *grp;
1483         u32 grpid;
1484         int ret;
1485
1486         ret = kstrtou32(name, 0, &grpid);
1487         if (ret)
1488                 goto out;
1489
1490         ret = -EINVAL;
1491         if (grpid <= 1 || grpid > NVMET_MAX_ANAGRPS)
1492                 goto out;
1493
1494         ret = -ENOMEM;
1495         grp = kzalloc(sizeof(*grp), GFP_KERNEL);
1496         if (!grp)
1497                 goto out;
1498         grp->port = port;
1499         grp->grpid = grpid;
1500
1501         down_write(&nvmet_ana_sem);
1502         nvmet_ana_group_enabled[grpid]++;
1503         up_write(&nvmet_ana_sem);
1504
1505         nvmet_port_send_ana_event(grp->port);
1506
1507         config_group_init_type_name(&grp->group, name, &nvmet_ana_group_type);
1508         return &grp->group;
1509 out:
1510         return ERR_PTR(ret);
1511 }
1512
1513 static struct configfs_group_operations nvmet_ana_groups_group_ops = {
1514         .make_group             = nvmet_ana_groups_make_group,
1515 };
1516
1517 static const struct config_item_type nvmet_ana_groups_type = {
1518         .ct_group_ops           = &nvmet_ana_groups_group_ops,
1519         .ct_owner               = THIS_MODULE,
1520 };
1521
1522 /*
1523  * Ports definitions.
1524  */
1525 static void nvmet_port_release(struct config_item *item)
1526 {
1527         struct nvmet_port *port = to_nvmet_port(item);
1528
1529         list_del(&port->global_entry);
1530
1531         kfree(port->ana_state);
1532         kfree(port);
1533 }
1534
1535 static struct configfs_attribute *nvmet_port_attrs[] = {
1536         &nvmet_attr_addr_adrfam,
1537         &nvmet_attr_addr_treq,
1538         &nvmet_attr_addr_traddr,
1539         &nvmet_attr_addr_trsvcid,
1540         &nvmet_attr_addr_trtype,
1541         &nvmet_attr_param_inline_data_size,
1542 #ifdef CONFIG_BLK_DEV_INTEGRITY
1543         &nvmet_attr_param_pi_enable,
1544 #endif
1545         NULL,
1546 };
1547
1548 static struct configfs_item_operations nvmet_port_item_ops = {
1549         .release                = nvmet_port_release,
1550 };
1551
1552 static const struct config_item_type nvmet_port_type = {
1553         .ct_attrs               = nvmet_port_attrs,
1554         .ct_item_ops            = &nvmet_port_item_ops,
1555         .ct_owner               = THIS_MODULE,
1556 };
1557
1558 static struct config_group *nvmet_ports_make(struct config_group *group,
1559                 const char *name)
1560 {
1561         struct nvmet_port *port;
1562         u16 portid;
1563         u32 i;
1564
1565         if (kstrtou16(name, 0, &portid))
1566                 return ERR_PTR(-EINVAL);
1567
1568         port = kzalloc(sizeof(*port), GFP_KERNEL);
1569         if (!port)
1570                 return ERR_PTR(-ENOMEM);
1571
1572         port->ana_state = kcalloc(NVMET_MAX_ANAGRPS + 1,
1573                         sizeof(*port->ana_state), GFP_KERNEL);
1574         if (!port->ana_state) {
1575                 kfree(port);
1576                 return ERR_PTR(-ENOMEM);
1577         }
1578
1579         for (i = 1; i <= NVMET_MAX_ANAGRPS; i++) {
1580                 if (i == NVMET_DEFAULT_ANA_GRPID)
1581                         port->ana_state[1] = NVME_ANA_OPTIMIZED;
1582                 else
1583                         port->ana_state[i] = NVME_ANA_INACCESSIBLE;
1584         }
1585
1586         list_add(&port->global_entry, &nvmet_ports_list);
1587
1588         INIT_LIST_HEAD(&port->entry);
1589         INIT_LIST_HEAD(&port->subsystems);
1590         INIT_LIST_HEAD(&port->referrals);
1591         port->inline_data_size = -1;    /* < 0 == let the transport choose */
1592
1593         port->disc_addr.portid = cpu_to_le16(portid);
1594         port->disc_addr.adrfam = NVMF_ADDR_FAMILY_MAX;
1595         port->disc_addr.treq = NVMF_TREQ_DISABLE_SQFLOW;
1596         config_group_init_type_name(&port->group, name, &nvmet_port_type);
1597
1598         config_group_init_type_name(&port->subsys_group,
1599                         "subsystems", &nvmet_port_subsys_type);
1600         configfs_add_default_group(&port->subsys_group, &port->group);
1601
1602         config_group_init_type_name(&port->referrals_group,
1603                         "referrals", &nvmet_referrals_type);
1604         configfs_add_default_group(&port->referrals_group, &port->group);
1605
1606         config_group_init_type_name(&port->ana_groups_group,
1607                         "ana_groups", &nvmet_ana_groups_type);
1608         configfs_add_default_group(&port->ana_groups_group, &port->group);
1609
1610         port->ana_default_group.port = port;
1611         port->ana_default_group.grpid = NVMET_DEFAULT_ANA_GRPID;
1612         config_group_init_type_name(&port->ana_default_group.group,
1613                         __stringify(NVMET_DEFAULT_ANA_GRPID),
1614                         &nvmet_ana_group_type);
1615         configfs_add_default_group(&port->ana_default_group.group,
1616                         &port->ana_groups_group);
1617
1618         return &port->group;
1619 }
1620
1621 static struct configfs_group_operations nvmet_ports_group_ops = {
1622         .make_group             = nvmet_ports_make,
1623 };
1624
1625 static const struct config_item_type nvmet_ports_type = {
1626         .ct_group_ops           = &nvmet_ports_group_ops,
1627         .ct_owner               = THIS_MODULE,
1628 };
1629
1630 static struct config_group nvmet_subsystems_group;
1631 static struct config_group nvmet_ports_group;
1632
1633 static void nvmet_host_release(struct config_item *item)
1634 {
1635         struct nvmet_host *host = to_host(item);
1636
1637         kfree(host);
1638 }
1639
1640 static struct configfs_item_operations nvmet_host_item_ops = {
1641         .release                = nvmet_host_release,
1642 };
1643
1644 static const struct config_item_type nvmet_host_type = {
1645         .ct_item_ops            = &nvmet_host_item_ops,
1646         .ct_owner               = THIS_MODULE,
1647 };
1648
1649 static struct config_group *nvmet_hosts_make_group(struct config_group *group,
1650                 const char *name)
1651 {
1652         struct nvmet_host *host;
1653
1654         host = kzalloc(sizeof(*host), GFP_KERNEL);
1655         if (!host)
1656                 return ERR_PTR(-ENOMEM);
1657
1658         config_group_init_type_name(&host->group, name, &nvmet_host_type);
1659
1660         return &host->group;
1661 }
1662
1663 static struct configfs_group_operations nvmet_hosts_group_ops = {
1664         .make_group             = nvmet_hosts_make_group,
1665 };
1666
1667 static const struct config_item_type nvmet_hosts_type = {
1668         .ct_group_ops           = &nvmet_hosts_group_ops,
1669         .ct_owner               = THIS_MODULE,
1670 };
1671
1672 static struct config_group nvmet_hosts_group;
1673
1674 static const struct config_item_type nvmet_root_type = {
1675         .ct_owner               = THIS_MODULE,
1676 };
1677
1678 static struct configfs_subsystem nvmet_configfs_subsystem = {
1679         .su_group = {
1680                 .cg_item = {
1681                         .ci_namebuf     = "nvmet",
1682                         .ci_type        = &nvmet_root_type,
1683                 },
1684         },
1685 };
1686
1687 int __init nvmet_init_configfs(void)
1688 {
1689         int ret;
1690
1691         config_group_init(&nvmet_configfs_subsystem.su_group);
1692         mutex_init(&nvmet_configfs_subsystem.su_mutex);
1693
1694         config_group_init_type_name(&nvmet_subsystems_group,
1695                         "subsystems", &nvmet_subsystems_type);
1696         configfs_add_default_group(&nvmet_subsystems_group,
1697                         &nvmet_configfs_subsystem.su_group);
1698
1699         config_group_init_type_name(&nvmet_ports_group,
1700                         "ports", &nvmet_ports_type);
1701         configfs_add_default_group(&nvmet_ports_group,
1702                         &nvmet_configfs_subsystem.su_group);
1703
1704         config_group_init_type_name(&nvmet_hosts_group,
1705                         "hosts", &nvmet_hosts_type);
1706         configfs_add_default_group(&nvmet_hosts_group,
1707                         &nvmet_configfs_subsystem.su_group);
1708
1709         ret = configfs_register_subsystem(&nvmet_configfs_subsystem);
1710         if (ret) {
1711                 pr_err("configfs_register_subsystem: %d\n", ret);
1712                 return ret;
1713         }
1714
1715         return 0;
1716 }
1717
1718 void __exit nvmet_exit_configfs(void)
1719 {
1720         configfs_unregister_subsystem(&nvmet_configfs_subsystem);
1721 }