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