drivers/nvme/host/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2011-2014, Intel Corporation.
   4  * Copyright (c) 2017-2021 Christoph Hellwig.
   5  */
   6 #include <linux/ptrace.h>       /* for force_successful_syscall_return */
   7 #include <linux/nvme_ioctl.h>
   8 #include <linux/io_uring.h>
   9 #include "nvme.h"
  10
  11 enum {
  12         NVME_IOCTL_VEC          = (1 << 0),
  13         NVME_IOCTL_PARTITION    = (1 << 1),
  14 };
  15
  16 static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c,
  17                 unsigned int flags, bool open_for_write)
  18 {
  19         u32 effects;
  20
  21         if (capable(CAP_SYS_ADMIN))
  22                 return true;
  23
  24         /*
  25          * Do not allow unprivileged passthrough on partitions, as that allows an
  26          * escape from the containment of the partition.
  27          */
  28         if (flags & NVME_IOCTL_PARTITION)
  29                 return false;
  30
  31         /*
  32          * Do not allow unprivileged processes to send vendor specific or fabrics
  33          * commands as we can't be sure about their effects.
  34          */
  35         if (c->common.opcode >= nvme_cmd_vendor_start ||
  36             c->common.opcode == nvme_fabrics_command)
  37                 return false;
  38
  39         /*
  40          * Do not allow unprivileged passthrough of admin commands except
  41          * for a subset of identify commands that contain information required
  42          * to form proper I/O commands in userspace and do not expose any
  43          * potentially sensitive information.
  44          */
  45         if (!ns) {
  46                 if (c->common.opcode == nvme_admin_identify) {
  47                         switch (c->identify.cns) {
  48                         case NVME_ID_CNS_NS:
  49                         case NVME_ID_CNS_CS_NS:
  50                         case NVME_ID_CNS_NS_CS_INDEP:
  51                         case NVME_ID_CNS_CS_CTRL:
  52                         case NVME_ID_CNS_CTRL:
  53                                 return true;
  54                         }
  55                 }
  56                 return false;
  57         }
  58
  59         /*
  60          * Check if the controller provides a Commands Supported and Effects log
  61          * and marks this command as supported.  If not reject unprivileged
  62          * passthrough.
  63          */
  64         effects = nvme_command_effects(ns->ctrl, ns, c->common.opcode);
  65         if (!(effects & NVME_CMD_EFFECTS_CSUPP))
  66                 return false;
  67
  68         /*
  69          * Don't allow passthrough for command that have intrusive (or unknown)
  70          * effects.
  71          */
  72         if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
  73                         NVME_CMD_EFFECTS_UUID_SEL |
  74                         NVME_CMD_EFFECTS_SCOPE_MASK))
  75                 return false;
  76
  77         /*
  78          * Only allow I/O commands that transfer data to the controller or that
  79          * change the logical block contents if the file descriptor is open for
  80          * writing.
  81          */
  82         if (nvme_is_write(c) || (effects & NVME_CMD_EFFECTS_LBCC))
  83                 return open_for_write;
  84         return true;
  85 }
  86
  87 /*
  88  * Convert integer values from ioctl structures to user pointers, silently
  89  * ignoring the upper bits in the compat case to match behaviour of 32-bit
  90  * kernels.
  91  */
  92 static void __user *nvme_to_user_ptr(uintptr_t ptrval)
  93 {
  94         if (in_compat_syscall())
  95                 ptrval = (compat_uptr_t)ptrval;
  96         return (void __user *)ptrval;
  97 }
  98
  99 static void *nvme_add_user_metadata(struct request *req, void __user *ubuf,
 100                 unsigned len, u32 seed)
 101 {
 102         struct bio_integrity_payload *bip;
 103         int ret = -ENOMEM;
 104         void *buf;
 105         struct bio *bio = req->bio;
 106
 107         buf = kmalloc(len, GFP_KERNEL);
 108         if (!buf)
 109                 goto out;
 110
 111         ret = -EFAULT;
 112         if ((req_op(req) == REQ_OP_DRV_OUT) && copy_from_user(buf, ubuf, len))
 113                 goto out_free_meta;
 114
 115         bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
 116         if (IS_ERR(bip)) {
 117                 ret = PTR_ERR(bip);
 118                 goto out_free_meta;
 119         }
 120
 121         bip->bip_iter.bi_size = len;
 122         bip->bip_iter.bi_sector = seed;
 123         ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
 124                         offset_in_page(buf));
 125         if (ret != len) {
 126                 ret = -ENOMEM;
 127                 goto out_free_meta;
 128         }
 129
 130         req->cmd_flags |= REQ_INTEGRITY;
 131         return buf;
 132 out_free_meta:
 133         kfree(buf);
 134 out:
 135         return ERR_PTR(ret);
 136 }
 137
 138 static int nvme_finish_user_metadata(struct request *req, void __user *ubuf,
 139                 void *meta, unsigned len, int ret)
 140 {
 141         if (!ret && req_op(req) == REQ_OP_DRV_IN &&
 142             copy_to_user(ubuf, meta, len))
 143                 ret = -EFAULT;
 144         kfree(meta);
 145         return ret;
 146 }
 147
 148 static struct request *nvme_alloc_user_request(struct request_queue *q,
 149                 struct nvme_command *cmd, blk_opf_t rq_flags,
 150                 blk_mq_req_flags_t blk_flags)
 151 {
 152         struct request *req;
 153
 154         req = blk_mq_alloc_request(q, nvme_req_op(cmd) | rq_flags, blk_flags);
 155         if (IS_ERR(req))
 156                 return req;
 157         nvme_init_request(req, cmd);
 158         nvme_req(req)->flags |= NVME_REQ_USERCMD;
 159         return req;
 160 }
 161
 162 static int nvme_map_user_request(struct request *req, u64 ubuffer,
 163                 unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
 164                 u32 meta_seed, void **metap, struct io_uring_cmd *ioucmd,
 165                 unsigned int flags)
 166 {
 167         struct request_queue *q = req->q;
 168         struct nvme_ns *ns = q->queuedata;
 169         struct block_device *bdev = ns ? ns->disk->part0 : NULL;
 170         struct bio *bio = NULL;
 171         void *meta = NULL;
 172         int ret;
 173
 174         if (ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED)) {
 175                 struct iov_iter iter;
 176
 177                 /* fixedbufs is only for non-vectored io */
 178                 if (WARN_ON_ONCE(flags & NVME_IOCTL_VEC))
 179                         return -EINVAL;
 180                 ret = io_uring_cmd_import_fixed(ubuffer, bufflen,
 181                                 rq_data_dir(req), &iter, ioucmd);
 182                 if (ret < 0)
 183                         goto out;
 184                 ret = blk_rq_map_user_iov(q, req, NULL, &iter, GFP_KERNEL);
 185         } else {
 186                 ret = blk_rq_map_user_io(req, NULL, nvme_to_user_ptr(ubuffer),
 187                                 bufflen, GFP_KERNEL, flags & NVME_IOCTL_VEC, 0,
 188                                 0, rq_data_dir(req));
 189         }
 190
 191         if (ret)
 192                 goto out;
 193         bio = req->bio;
 194         if (bdev)
 195                 bio_set_dev(bio, bdev);
 196
 197         if (bdev && meta_buffer && meta_len) {
 198                 meta = nvme_add_user_metadata(req, meta_buffer, meta_len,
 199                                 meta_seed);
 200                 if (IS_ERR(meta)) {
 201                         ret = PTR_ERR(meta);
 202                         goto out_unmap;
 203                 }
 204                 *metap = meta;
 205         }
 206
 207         return ret;
 208
 209 out_unmap:
 210         if (bio)
 211                 blk_rq_unmap_user(bio);
 212 out:
 213         blk_mq_free_request(req);
 214         return ret;
 215 }
 216
 217 static int nvme_submit_user_cmd(struct request_queue *q,
 218                 struct nvme_command *cmd, u64 ubuffer, unsigned bufflen,
 219                 void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 220                 u64 *result, unsigned timeout, unsigned int flags)
 221 {
 222         struct nvme_ns *ns = q->queuedata;
 223         struct nvme_ctrl *ctrl;
 224         struct request *req;
 225         void *meta = NULL;
 226         struct bio *bio;
 227         u32 effects;
 228         int ret;
 229
 230         req = nvme_alloc_user_request(q, cmd, 0, 0);
 231         if (IS_ERR(req))
 232                 return PTR_ERR(req);
 233
 234         req->timeout = timeout;
 235         if (ubuffer && bufflen) {
 236                 ret = nvme_map_user_request(req, ubuffer, bufflen, meta_buffer,
 237                                 meta_len, meta_seed, &meta, NULL, flags);
 238                 if (ret)
 239                         return ret;
 240         }
 241
 242         bio = req->bio;
 243         ctrl = nvme_req(req)->ctrl;
 244
 245         effects = nvme_passthru_start(ctrl, ns, cmd->common.opcode);
 246         ret = nvme_execute_rq(req, false);
 247         if (result)
 248                 *result = le64_to_cpu(nvme_req(req)->result.u64);
 249         if (meta)
 250                 ret = nvme_finish_user_metadata(req, meta_buffer, meta,
 251                                                 meta_len, ret);
 252         if (bio)
 253                 blk_rq_unmap_user(bio);
 254         blk_mq_free_request(req);
 255
 256         if (effects)
 257                 nvme_passthru_end(ctrl, ns, effects, cmd, ret);
 258
 259         return ret;
 260 }
 261
 262 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
 263 {
 264         struct nvme_user_io io;
 265         struct nvme_command c;
 266         unsigned length, meta_len;
 267         void __user *metadata;
 268
 269         if (copy_from_user(&io, uio, sizeof(io)))
 270                 return -EFAULT;
 271         if (io.flags)
 272                 return -EINVAL;
 273
 274         switch (io.opcode) {
 275         case nvme_cmd_write:
 276         case nvme_cmd_read:
 277         case nvme_cmd_compare:
 278                 break;
 279         default:
 280                 return -EINVAL;
 281         }
 282
 283         length = (io.nblocks + 1) << ns->lba_shift;
 284
 285         if ((io.control & NVME_RW_PRINFO_PRACT) &&
 286             ns->ms == sizeof(struct t10_pi_tuple)) {
 287                 /*
 288                  * Protection information is stripped/inserted by the
 289                  * controller.
 290                  */
 291                 if (nvme_to_user_ptr(io.metadata))
 292                         return -EINVAL;
 293                 meta_len = 0;
 294                 metadata = NULL;
 295         } else {
 296                 meta_len = (io.nblocks + 1) * ns->ms;
 297                 metadata = nvme_to_user_ptr(io.metadata);
 298         }
 299
 300         if (ns->features & NVME_NS_EXT_LBAS) {
 301                 length += meta_len;
 302                 meta_len = 0;
 303         } else if (meta_len) {
 304                 if ((io.metadata & 3) || !io.metadata)
 305                         return -EINVAL;
 306         }
 307
 308         memset(&c, 0, sizeof(c));
 309         c.rw.opcode = io.opcode;
 310         c.rw.flags = io.flags;
 311         c.rw.nsid = cpu_to_le32(ns->head->ns_id);
 312         c.rw.slba = cpu_to_le64(io.slba);
 313         c.rw.length = cpu_to_le16(io.nblocks);
 314         c.rw.control = cpu_to_le16(io.control);
 315         c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
 316         c.rw.reftag = cpu_to_le32(io.reftag);
 317         c.rw.apptag = cpu_to_le16(io.apptag);
 318         c.rw.appmask = cpu_to_le16(io.appmask);
 319
 320         return nvme_submit_user_cmd(ns->queue, &c, io.addr, length, metadata,
 321                         meta_len, lower_32_bits(io.slba), NULL, 0, 0);
 322 }
 323
 324 static bool nvme_validate_passthru_nsid(struct nvme_ctrl *ctrl,
 325                                         struct nvme_ns *ns, __u32 nsid)
 326 {
 327         if (ns && nsid != ns->head->ns_id) {
 328                 dev_err(ctrl->device,
 329                         "%s: nsid (%u) in cmd does not match nsid (%u)"
 330                         "of namespace\n",
 331                         current->comm, nsid, ns->head->ns_id);
 332                 return false;
 333         }
 334
 335         return true;
 336 }
 337
 338 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 339                 struct nvme_passthru_cmd __user *ucmd, unsigned int flags,
 340                 bool open_for_write)
 341 {
 342         struct nvme_passthru_cmd cmd;
 343         struct nvme_command c;
 344         unsigned timeout = 0;
 345         u64 result;
 346         int status;
 347
 348         if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
 349                 return -EFAULT;
 350         if (cmd.flags)
 351                 return -EINVAL;
 352         if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid))
 353                 return -EINVAL;
 354
 355         memset(&c, 0, sizeof(c));
 356         c.common.opcode = cmd.opcode;
 357         c.common.flags = cmd.flags;
 358         c.common.nsid = cpu_to_le32(cmd.nsid);
 359         c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
 360         c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
 361         c.common.cdw10 = cpu_to_le32(cmd.cdw10);
 362         c.common.cdw11 = cpu_to_le32(cmd.cdw11);
 363         c.common.cdw12 = cpu_to_le32(cmd.cdw12);
 364         c.common.cdw13 = cpu_to_le32(cmd.cdw13);
 365         c.common.cdw14 = cpu_to_le32(cmd.cdw14);
 366         c.common.cdw15 = cpu_to_le32(cmd.cdw15);
 367
 368         if (!nvme_cmd_allowed(ns, &c, 0, open_for_write))
 369                 return -EACCES;
 370
 371         if (cmd.timeout_ms)
 372                 timeout = msecs_to_jiffies(cmd.timeout_ms);
 373
 374         status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
 375                         cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata),
 376                         cmd.metadata_len, 0, &result, timeout, 0);
 377
 378         if (status >= 0) {
 379                 if (put_user(result, &ucmd->result))
 380                         return -EFAULT;
 381         }
 382
 383         return status;
 384 }
 385
 386 static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 387                 struct nvme_passthru_cmd64 __user *ucmd, unsigned int flags,
 388                 bool open_for_write)
 389 {
 390         struct nvme_passthru_cmd64 cmd;
 391         struct nvme_command c;
 392         unsigned timeout = 0;
 393         int status;
 394
 395         if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
 396                 return -EFAULT;
 397         if (cmd.flags)
 398                 return -EINVAL;
 399         if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid))
 400                 return -EINVAL;
 401
 402         memset(&c, 0, sizeof(c));
 403         c.common.opcode = cmd.opcode;
 404         c.common.flags = cmd.flags;
 405         c.common.nsid = cpu_to_le32(cmd.nsid);
 406         c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
 407         c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
 408         c.common.cdw10 = cpu_to_le32(cmd.cdw10);
 409         c.common.cdw11 = cpu_to_le32(cmd.cdw11);
 410         c.common.cdw12 = cpu_to_le32(cmd.cdw12);
 411         c.common.cdw13 = cpu_to_le32(cmd.cdw13);
 412         c.common.cdw14 = cpu_to_le32(cmd.cdw14);
 413         c.common.cdw15 = cpu_to_le32(cmd.cdw15);
 414
 415         if (!nvme_cmd_allowed(ns, &c, flags, open_for_write))
 416                 return -EACCES;
 417
 418         if (cmd.timeout_ms)
 419                 timeout = msecs_to_jiffies(cmd.timeout_ms);
 420
 421         status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
 422                         cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata),
 423                         cmd.metadata_len, 0, &cmd.result, timeout, flags);
 424
 425         if (status >= 0) {
 426                 if (put_user(cmd.result, &ucmd->result))
 427                         return -EFAULT;
 428         }
 429
 430         return status;
 431 }
 432
 433 struct nvme_uring_data {
 434         __u64   metadata;
 435         __u64   addr;
 436         __u32   data_len;
 437         __u32   metadata_len;
 438         __u32   timeout_ms;
 439 };
 440
 441 /*
 442  * This overlays struct io_uring_cmd pdu.
 443  * Expect build errors if this grows larger than that.
 444  */
 445 struct nvme_uring_cmd_pdu {
 446         union {
 447                 struct bio *bio;
 448                 struct request *req;
 449         };
 450         u32 meta_len;
 451         u32 nvme_status;
 452         union {
 453                 struct {
 454                         void *meta; /* kernel-resident buffer */
 455                         void __user *meta_buffer;
 456                 };
 457                 u64 result;
 458         } u;
 459 };
 460
 461 static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
 462                 struct io_uring_cmd *ioucmd)
 463 {
 464         return (struct nvme_uring_cmd_pdu *)&ioucmd->pdu;
 465 }
 466
 467 static void nvme_uring_task_meta_cb(struct io_uring_cmd *ioucmd,
 468                                     unsigned issue_flags)
 469 {
 470         struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
 471         struct request *req = pdu->req;
 472         int status;
 473         u64 result;
 474
 475         if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
 476                 status = -EINTR;
 477         else
 478                 status = nvme_req(req)->status;
 479
 480         result = le64_to_cpu(nvme_req(req)->result.u64);
 481
 482         if (pdu->meta_len)
 483                 status = nvme_finish_user_metadata(req, pdu->u.meta_buffer,
 484                                         pdu->u.meta, pdu->meta_len, status);
 485         if (req->bio)
 486                 blk_rq_unmap_user(req->bio);
 487         blk_mq_free_request(req);
 488
 489         io_uring_cmd_done(ioucmd, status, result, issue_flags);
 490 }
 491
 492 static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd,
 493                                unsigned issue_flags)
 494 {
 495         struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
 496
 497         if (pdu->bio)
 498                 blk_rq_unmap_user(pdu->bio);
 499
 500         io_uring_cmd_done(ioucmd, pdu->nvme_status, pdu->u.result, issue_flags);
 501 }
 502
 503 static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
 504                                                 blk_status_t err)
 505 {
 506         struct io_uring_cmd *ioucmd = req->end_io_data;
 507         struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
 508
 509         req->bio = pdu->bio;
 510         if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
 511                 pdu->nvme_status = -EINTR;
 512         else
 513                 pdu->nvme_status = nvme_req(req)->status;
 514         pdu->u.result = le64_to_cpu(nvme_req(req)->result.u64);
 515
 516         /*
 517          * For iopoll, complete it directly.
 518          * Otherwise, move the completion to task work.
 519          */
 520         if (blk_rq_is_poll(req)) {
 521                 WRITE_ONCE(ioucmd->cookie, NULL);
 522                 nvme_uring_task_cb(ioucmd, IO_URING_F_UNLOCKED);
 523         } else {
 524                 io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb);
 525         }
 526
 527         return RQ_END_IO_FREE;
 528 }
 529
 530 static enum rq_end_io_ret nvme_uring_cmd_end_io_meta(struct request *req,
 531                                                      blk_status_t err)
 532 {
 533         struct io_uring_cmd *ioucmd = req->end_io_data;
 534         struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
 535
 536         req->bio = pdu->bio;
 537         pdu->req = req;
 538
 539         /*
 540          * For iopoll, complete it directly.
 541          * Otherwise, move the completion to task work.
 542          */
 543         if (blk_rq_is_poll(req)) {
 544                 WRITE_ONCE(ioucmd->cookie, NULL);
 545                 nvme_uring_task_meta_cb(ioucmd, IO_URING_F_UNLOCKED);
 546         } else {
 547                 io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_meta_cb);
 548         }
 549
 550         return RQ_END_IO_NONE;
 551 }
 552
 553 static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 554                 struct io_uring_cmd *ioucmd, unsigned int issue_flags, bool vec)
 555 {
 556         struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
 557         const struct nvme_uring_cmd *cmd = io_uring_sqe_cmd(ioucmd->sqe);
 558         struct request_queue *q = ns ? ns->queue : ctrl->admin_q;
 559         struct nvme_uring_data d;
 560         struct nvme_command c;
 561         struct request *req;
 562         blk_opf_t rq_flags = REQ_ALLOC_CACHE;
 563         blk_mq_req_flags_t blk_flags = 0;
 564         void *meta = NULL;
 565         int ret;
 566
 567         c.common.opcode = READ_ONCE(cmd->opcode);
 568         c.common.flags = READ_ONCE(cmd->flags);
 569         if (c.common.flags)
 570                 return -EINVAL;
 571
 572         c.common.command_id = 0;
 573         c.common.nsid = cpu_to_le32(cmd->nsid);
 574         if (!nvme_validate_passthru_nsid(ctrl, ns, le32_to_cpu(c.common.nsid)))
 575                 return -EINVAL;
 576
 577         c.common.cdw2[0] = cpu_to_le32(READ_ONCE(cmd->cdw2));
 578         c.common.cdw2[1] = cpu_to_le32(READ_ONCE(cmd->cdw3));
 579         c.common.metadata = 0;
 580         c.common.dptr.prp1 = c.common.dptr.prp2 = 0;
 581         c.common.cdw10 = cpu_to_le32(READ_ONCE(cmd->cdw10));
 582         c.common.cdw11 = cpu_to_le32(READ_ONCE(cmd->cdw11));
 583         c.common.cdw12 = cpu_to_le32(READ_ONCE(cmd->cdw12));
 584         c.common.cdw13 = cpu_to_le32(READ_ONCE(cmd->cdw13));
 585         c.common.cdw14 = cpu_to_le32(READ_ONCE(cmd->cdw14));
 586         c.common.cdw15 = cpu_to_le32(READ_ONCE(cmd->cdw15));
 587
 588         if (!nvme_cmd_allowed(ns, &c, 0, ioucmd->file->f_mode & FMODE_WRITE))
 589                 return -EACCES;
 590
 591         d.metadata = READ_ONCE(cmd->metadata);
 592         d.addr = READ_ONCE(cmd->addr);
 593         d.data_len = READ_ONCE(cmd->data_len);
 594         d.metadata_len = READ_ONCE(cmd->metadata_len);
 595         d.timeout_ms = READ_ONCE(cmd->timeout_ms);
 596
 597         if (issue_flags & IO_URING_F_NONBLOCK) {
 598                 rq_flags |= REQ_NOWAIT;
 599                 blk_flags = BLK_MQ_REQ_NOWAIT;
 600         }
 601         if (issue_flags & IO_URING_F_IOPOLL)
 602                 rq_flags |= REQ_POLLED;
 603
 604         req = nvme_alloc_user_request(q, &c, rq_flags, blk_flags);
 605         if (IS_ERR(req))
 606                 return PTR_ERR(req);
 607         req->timeout = d.timeout_ms ? msecs_to_jiffies(d.timeout_ms) : 0;
 608
 609         if (d.addr && d.data_len) {
 610                 ret = nvme_map_user_request(req, d.addr,
 611                         d.data_len, nvme_to_user_ptr(d.metadata),
 612                         d.metadata_len, 0, &meta, ioucmd, vec);
 613                 if (ret)
 614                         return ret;
 615         }
 616
 617         if (blk_rq_is_poll(req)) {
 618                 ioucmd->flags |= IORING_URING_CMD_POLLED;
 619                 WRITE_ONCE(ioucmd->cookie, req);
 620         }
 621
 622         /* to free bio on completion, as req->bio will be null at that time */
 623         pdu->bio = req->bio;
 624         pdu->meta_len = d.metadata_len;
 625         req->end_io_data = ioucmd;
 626         if (pdu->meta_len) {
 627                 pdu->u.meta = meta;
 628                 pdu->u.meta_buffer = nvme_to_user_ptr(d.metadata);
 629                 req->end_io = nvme_uring_cmd_end_io_meta;
 630         } else {
 631                 req->end_io = nvme_uring_cmd_end_io;
 632         }
 633         blk_execute_rq_nowait(req, false);
 634         return -EIOCBQUEUED;
 635 }
 636
 637 static bool is_ctrl_ioctl(unsigned int cmd)
 638 {
 639         if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD)
 640                 return true;
 641         if (is_sed_ioctl(cmd))
 642                 return true;
 643         return false;
 644 }
 645
 646 static int nvme_ctrl_ioctl(struct nvme_ctrl *ctrl, unsigned int cmd,
 647                 void __user *argp, bool open_for_write)
 648 {
 649         switch (cmd) {
 650         case NVME_IOCTL_ADMIN_CMD:
 651                 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write);
 652         case NVME_IOCTL_ADMIN64_CMD:
 653                 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write);
 654         default:
 655                 return sed_ioctl(ctrl->opal_dev, cmd, argp);
 656         }
 657 }
 658
 659 #ifdef COMPAT_FOR_U64_ALIGNMENT
 660 struct nvme_user_io32 {
 661         __u8    opcode;
 662         __u8    flags;
 663         __u16   control;
 664         __u16   nblocks;
 665         __u16   rsvd;
 666         __u64   metadata;
 667         __u64   addr;
 668         __u64   slba;
 669         __u32   dsmgmt;
 670         __u32   reftag;
 671         __u16   apptag;
 672         __u16   appmask;
 673 } __attribute__((__packed__));
 674 #define NVME_IOCTL_SUBMIT_IO32  _IOW('N', 0x42, struct nvme_user_io32)
 675 #endif /* COMPAT_FOR_U64_ALIGNMENT */
 676
 677 static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd,
 678                 void __user *argp, unsigned int flags, bool open_for_write)
 679 {
 680         switch (cmd) {
 681         case NVME_IOCTL_ID:
 682                 force_successful_syscall_return();
 683                 return ns->head->ns_id;
 684         case NVME_IOCTL_IO_CMD:
 685                 return nvme_user_cmd(ns->ctrl, ns, argp, flags, open_for_write);
 686         /*
 687          * struct nvme_user_io can have different padding on some 32-bit ABIs.
 688          * Just accept the compat version as all fields that are used are the
 689          * same size and at the same offset.
 690          */
 691 #ifdef COMPAT_FOR_U64_ALIGNMENT
 692         case NVME_IOCTL_SUBMIT_IO32:
 693 #endif
 694         case NVME_IOCTL_SUBMIT_IO:
 695                 return nvme_submit_io(ns, argp);
 696         case NVME_IOCTL_IO64_CMD_VEC:
 697                 flags |= NVME_IOCTL_VEC;
 698                 fallthrough;
 699         case NVME_IOCTL_IO64_CMD:
 700                 return nvme_user_cmd64(ns->ctrl, ns, argp, flags,
 701                                        open_for_write);
 702         default:
 703                 return -ENOTTY;
 704         }
 705 }
 706
 707 int nvme_ioctl(struct block_device *bdev, blk_mode_t mode,
 708                 unsigned int cmd, unsigned long arg)
 709 {
 710         struct nvme_ns *ns = bdev->bd_disk->private_data;
 711         bool open_for_write = mode & BLK_OPEN_WRITE;
 712         void __user *argp = (void __user *)arg;
 713         unsigned int flags = 0;
 714
 715         if (bdev_is_partition(bdev))
 716                 flags |= NVME_IOCTL_PARTITION;
 717
 718         if (is_ctrl_ioctl(cmd))
 719                 return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write);
 720         return nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write);
 721 }
 722
 723 long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 724 {
 725         struct nvme_ns *ns =
 726                 container_of(file_inode(file)->i_cdev, struct nvme_ns, cdev);
 727         bool open_for_write = file->f_mode & FMODE_WRITE;
 728         void __user *argp = (void __user *)arg;
 729
 730         if (is_ctrl_ioctl(cmd))
 731                 return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write);
 732         return nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write);
 733 }
 734
 735 static int nvme_uring_cmd_checks(unsigned int issue_flags)
 736 {
 737
 738         /* NVMe passthrough requires big SQE/CQE support */
 739         if ((issue_flags & (IO_URING_F_SQE128|IO_URING_F_CQE32)) !=
 740             (IO_URING_F_SQE128|IO_URING_F_CQE32))
 741                 return -EOPNOTSUPP;
 742         return 0;
 743 }
 744
 745 static int nvme_ns_uring_cmd(struct nvme_ns *ns, struct io_uring_cmd *ioucmd,
 746                              unsigned int issue_flags)
 747 {
 748         struct nvme_ctrl *ctrl = ns->ctrl;
 749         int ret;
 750
 751         BUILD_BUG_ON(sizeof(struct nvme_uring_cmd_pdu) > sizeof(ioucmd->pdu));
 752
 753         ret = nvme_uring_cmd_checks(issue_flags);
 754         if (ret)
 755                 return ret;
 756
 757         switch (ioucmd->cmd_op) {
 758         case NVME_URING_CMD_IO:
 759                 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, false);
 760                 break;
 761         case NVME_URING_CMD_IO_VEC:
 762                 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, true);
 763                 break;
 764         default:
 765                 ret = -ENOTTY;
 766         }
 767
 768         return ret;
 769 }
 770
 771 int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags)
 772 {
 773         struct nvme_ns *ns = container_of(file_inode(ioucmd->file)->i_cdev,
 774                         struct nvme_ns, cdev);
 775
 776         return nvme_ns_uring_cmd(ns, ioucmd, issue_flags);
 777 }
 778
 779 int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd,
 780                                  struct io_comp_batch *iob,
 781                                  unsigned int poll_flags)
 782 {
 783         struct request *req;
 784         int ret = 0;
 785
 786         if (!(ioucmd->flags & IORING_URING_CMD_POLLED))
 787                 return 0;
 788
 789         req = READ_ONCE(ioucmd->cookie);
 790         if (req && blk_rq_is_poll(req))
 791                 ret = blk_rq_poll(req, iob, poll_flags);
 792         return ret;
 793 }
 794 #ifdef CONFIG_NVME_MULTIPATH
 795 static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
 796                 void __user *argp, struct nvme_ns_head *head, int srcu_idx,
 797                 bool open_for_write)
 798         __releases(&head->srcu)
 799 {
 800         struct nvme_ctrl *ctrl = ns->ctrl;
 801         int ret;
 802
 803         nvme_get_ctrl(ns->ctrl);
 804         srcu_read_unlock(&head->srcu, srcu_idx);
 805         ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write);
 806
 807         nvme_put_ctrl(ctrl);
 808         return ret;
 809 }
 810
 811 int nvme_ns_head_ioctl(struct block_device *bdev, blk_mode_t mode,
 812                 unsigned int cmd, unsigned long arg)
 813 {
 814         struct nvme_ns_head *head = bdev->bd_disk->private_data;
 815         bool open_for_write = mode & BLK_OPEN_WRITE;
 816         void __user *argp = (void __user *)arg;
 817         struct nvme_ns *ns;
 818         int srcu_idx, ret = -EWOULDBLOCK;
 819         unsigned int flags = 0;
 820
 821         if (bdev_is_partition(bdev))
 822                 flags |= NVME_IOCTL_PARTITION;
 823
 824         srcu_idx = srcu_read_lock(&head->srcu);
 825         ns = nvme_find_path(head);
 826         if (!ns)
 827                 goto out_unlock;
 828
 829         /*
 830          * Handle ioctls that apply to the controller instead of the namespace
 831          * seperately and drop the ns SRCU reference early.  This avoids a
 832          * deadlock when deleting namespaces using the passthrough interface.
 833          */
 834         if (is_ctrl_ioctl(cmd))
 835                 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx,
 836                                                open_for_write);
 837
 838         ret = nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write);
 839 out_unlock:
 840         srcu_read_unlock(&head->srcu, srcu_idx);
 841         return ret;
 842 }
 843
 844 long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
 845                 unsigned long arg)
 846 {
 847         bool open_for_write = file->f_mode & FMODE_WRITE;
 848         struct cdev *cdev = file_inode(file)->i_cdev;
 849         struct nvme_ns_head *head =
 850                 container_of(cdev, struct nvme_ns_head, cdev);
 851         void __user *argp = (void __user *)arg;
 852         struct nvme_ns *ns;
 853         int srcu_idx, ret = -EWOULDBLOCK;
 854
 855         srcu_idx = srcu_read_lock(&head->srcu);
 856         ns = nvme_find_path(head);
 857         if (!ns)
 858                 goto out_unlock;
 859
 860         if (is_ctrl_ioctl(cmd))
 861                 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx,
 862                                 open_for_write);
 863
 864         ret = nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write);
 865 out_unlock:
 866         srcu_read_unlock(&head->srcu, srcu_idx);
 867         return ret;
 868 }
 869
 870 int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd,
 871                 unsigned int issue_flags)
 872 {
 873         struct cdev *cdev = file_inode(ioucmd->file)->i_cdev;
 874         struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev);
 875         int srcu_idx = srcu_read_lock(&head->srcu);
 876         struct nvme_ns *ns = nvme_find_path(head);
 877         int ret = -EINVAL;
 878
 879         if (ns)
 880                 ret = nvme_ns_uring_cmd(ns, ioucmd, issue_flags);
 881         srcu_read_unlock(&head->srcu, srcu_idx);
 882         return ret;
 883 }
 884 #endif /* CONFIG_NVME_MULTIPATH */
 885
 886 int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags)
 887 {
 888         struct nvme_ctrl *ctrl = ioucmd->file->private_data;
 889         int ret;
 890
 891         /* IOPOLL not supported yet */
 892         if (issue_flags & IO_URING_F_IOPOLL)
 893                 return -EOPNOTSUPP;
 894
 895         ret = nvme_uring_cmd_checks(issue_flags);
 896         if (ret)
 897                 return ret;
 898
 899         switch (ioucmd->cmd_op) {
 900         case NVME_URING_CMD_ADMIN:
 901                 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, false);
 902                 break;
 903         case NVME_URING_CMD_ADMIN_VEC:
 904                 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, true);
 905                 break;
 906         default:
 907                 ret = -ENOTTY;
 908         }
 909
 910         return ret;
 911 }
 912
 913 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp,
 914                 bool open_for_write)
 915 {
 916         struct nvme_ns *ns;
 917         int ret;
 918
 919         down_read(&ctrl->namespaces_rwsem);
 920         if (list_empty(&ctrl->namespaces)) {
 921                 ret = -ENOTTY;
 922                 goto out_unlock;
 923         }
 924
 925         ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
 926         if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
 927                 dev_warn(ctrl->device,
 928                         "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
 929                 ret = -EINVAL;
 930                 goto out_unlock;
 931         }
 932
 933         dev_warn(ctrl->device,
 934                 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
 935         kref_get(&ns->kref);
 936         up_read(&ctrl->namespaces_rwsem);
 937
 938         ret = nvme_user_cmd(ctrl, ns, argp, 0, open_for_write);
 939         nvme_put_ns(ns);
 940         return ret;
 941
 942 out_unlock:
 943         up_read(&ctrl->namespaces_rwsem);
 944         return ret;
 945 }
 946
 947 long nvme_dev_ioctl(struct file *file, unsigned int cmd,
 948                 unsigned long arg)
 949 {
 950         bool open_for_write = file->f_mode & FMODE_WRITE;
 951         struct nvme_ctrl *ctrl = file->private_data;
 952         void __user *argp = (void __user *)arg;
 953
 954         switch (cmd) {
 955         case NVME_IOCTL_ADMIN_CMD:
 956                 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write);
 957         case NVME_IOCTL_ADMIN64_CMD:
 958                 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write);
 959         case NVME_IOCTL_IO_CMD:
 960                 return nvme_dev_user_cmd(ctrl, argp, open_for_write);
 961         case NVME_IOCTL_RESET:
 962                 if (!capable(CAP_SYS_ADMIN))
 963                         return -EACCES;
 964                 dev_warn(ctrl->device, "resetting controller\n");
 965                 return nvme_reset_ctrl_sync(ctrl);
 966         case NVME_IOCTL_SUBSYS_RESET:
 967                 if (!capable(CAP_SYS_ADMIN))
 968                         return -EACCES;
 969                 return nvme_reset_subsystem(ctrl);
 970         case NVME_IOCTL_RESCAN:
 971                 if (!capable(CAP_SYS_ADMIN))
 972                         return -EACCES;
 973                 nvme_queue_scan(ctrl);
 974                 return 0;
 975         default:
 976                 return -ENOTTY;
 977         }
 978 }