1 /* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */ 2 /* 3 * Header file for the io_uring interface. 4 * 5 * Copyright (C) 2019 Jens Axboe 6 * Copyright (C) 2019 Christoph Hellwig 7 */ 8 #ifndef LINUX_IO_URING_H 9 #define LINUX_IO_URING_H 10 11 #include <linux/fs.h> 12 #include <linux/types.h> 13 #include <linux/time_types.h> 14 15 /* 16 * IO submission data structure (Submission Queue Entry) 17 */ 18 struct io_uring_sqe { 19 __u8 opcode; /* type of operation for this sqe */ 20 __u8 flags; /* IOSQE_ flags */ 21 __u16 ioprio; /* ioprio for the request */ 22 __s32 fd; /* file descriptor to do IO on */ 23 union { 24 __u64 off; /* offset into file */ 25 __u64 addr2; 26 struct { 27 __u32 cmd_op; 28 __u32 __pad1; 29 }; 30 }; 31 union { 32 __u64 addr; /* pointer to buffer or iovecs */ 33 __u64 splice_off_in; 34 }; 35 __u32 len; /* buffer size or number of iovecs */ 36 union { 37 __kernel_rwf_t rw_flags; 38 __u32 fsync_flags; 39 __u16 poll_events; /* compatibility */ 40 __u32 poll32_events; /* word-reversed for BE */ 41 __u32 sync_range_flags; 42 __u32 msg_flags; 43 __u32 timeout_flags; 44 __u32 accept_flags; 45 __u32 cancel_flags; 46 __u32 open_flags; 47 __u32 statx_flags; 48 __u32 fadvise_advice; 49 __u32 splice_flags; 50 __u32 rename_flags; 51 __u32 unlink_flags; 52 __u32 hardlink_flags; 53 __u32 xattr_flags; 54 __u32 msg_ring_flags; 55 }; 56 __u64 user_data; /* data to be passed back at completion time */ 57 /* pack this to avoid bogus arm OABI complaints */ 58 union { 59 /* index into fixed buffers, if used */ 60 __u16 buf_index; 61 /* for grouped buffer selection */ 62 __u16 buf_group; 63 } __attribute__((packed)); 64 /* personality to use, if used */ 65 __u16 personality; 66 union { 67 __s32 splice_fd_in; 68 __u32 file_index; 69 struct { 70 __u16 notification_idx; 71 __u16 addr_len; 72 }; 73 }; 74 union { 75 struct { 76 __u64 addr3; 77 __u64 __pad2[1]; 78 }; 79 /* 80 * If the ring is initialized with IORING_SETUP_SQE128, then 81 * this field is used for 80 bytes of arbitrary command data 82 */ 83 __u8 cmd[0]; 84 }; 85 }; 86 87 /* 88 * If sqe->file_index is set to this for opcodes that instantiate a new 89 * direct descriptor (like openat/openat2/accept), then io_uring will allocate 90 * an available direct descriptor instead of having the application pass one 91 * in. The picked direct descriptor will be returned in cqe->res, or -ENFILE 92 * if the space is full. 93 */ 94 #define IORING_FILE_INDEX_ALLOC (~0U) 95 96 enum { 97 IOSQE_FIXED_FILE_BIT, 98 IOSQE_IO_DRAIN_BIT, 99 IOSQE_IO_LINK_BIT, 100 IOSQE_IO_HARDLINK_BIT, 101 IOSQE_ASYNC_BIT, 102 IOSQE_BUFFER_SELECT_BIT, 103 IOSQE_CQE_SKIP_SUCCESS_BIT, 104 }; 105 106 /* 107 * sqe->flags 108 */ 109 /* use fixed fileset */ 110 #define IOSQE_FIXED_FILE (1U << IOSQE_FIXED_FILE_BIT) 111 /* issue after inflight IO */ 112 #define IOSQE_IO_DRAIN (1U << IOSQE_IO_DRAIN_BIT) 113 /* links next sqe */ 114 #define IOSQE_IO_LINK (1U << IOSQE_IO_LINK_BIT) 115 /* like LINK, but stronger */ 116 #define IOSQE_IO_HARDLINK (1U << IOSQE_IO_HARDLINK_BIT) 117 /* always go async */ 118 #define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT) 119 /* select buffer from sqe->buf_group */ 120 #define IOSQE_BUFFER_SELECT (1U << IOSQE_BUFFER_SELECT_BIT) 121 /* don't post CQE if request succeeded */ 122 #define IOSQE_CQE_SKIP_SUCCESS (1U << IOSQE_CQE_SKIP_SUCCESS_BIT) 123 124 /* 125 * io_uring_setup() flags 126 */ 127 #define IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */ 128 #define IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */ 129 #define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */ 130 #define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */ 131 #define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */ 132 #define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */ 133 #define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */ 134 #define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */ 135 /* 136 * Cooperative task running. When requests complete, they often require 137 * forcing the submitter to transition to the kernel to complete. If this 138 * flag is set, work will be done when the task transitions anyway, rather 139 * than force an inter-processor interrupt reschedule. This avoids interrupting 140 * a task running in userspace, and saves an IPI. 141 */ 142 #define IORING_SETUP_COOP_TASKRUN (1U << 8) 143 /* 144 * If COOP_TASKRUN is set, get notified if task work is available for 145 * running and a kernel transition would be needed to run it. This sets 146 * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN. 147 */ 148 #define IORING_SETUP_TASKRUN_FLAG (1U << 9) 149 #define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */ 150 #define IORING_SETUP_CQE32 (1U << 11) /* CQEs are 32 byte */ 151 /* 152 * Only one task is allowed to submit requests 153 */ 154 #define IORING_SETUP_SINGLE_ISSUER (1U << 12) 155 156 enum io_uring_op { 157 IORING_OP_NOP, 158 IORING_OP_READV, 159 IORING_OP_WRITEV, 160 IORING_OP_FSYNC, 161 IORING_OP_READ_FIXED, 162 IORING_OP_WRITE_FIXED, 163 IORING_OP_POLL_ADD, 164 IORING_OP_POLL_REMOVE, 165 IORING_OP_SYNC_FILE_RANGE, 166 IORING_OP_SENDMSG, 167 IORING_OP_RECVMSG, 168 IORING_OP_TIMEOUT, 169 IORING_OP_TIMEOUT_REMOVE, 170 IORING_OP_ACCEPT, 171 IORING_OP_ASYNC_CANCEL, 172 IORING_OP_LINK_TIMEOUT, 173 IORING_OP_CONNECT, 174 IORING_OP_FALLOCATE, 175 IORING_OP_OPENAT, 176 IORING_OP_CLOSE, 177 IORING_OP_RSRC_UPDATE, 178 IORING_OP_FILES_UPDATE = IORING_OP_RSRC_UPDATE, 179 IORING_OP_STATX, 180 IORING_OP_READ, 181 IORING_OP_WRITE, 182 IORING_OP_FADVISE, 183 IORING_OP_MADVISE, 184 IORING_OP_SEND, 185 IORING_OP_RECV, 186 IORING_OP_OPENAT2, 187 IORING_OP_EPOLL_CTL, 188 IORING_OP_SPLICE, 189 IORING_OP_PROVIDE_BUFFERS, 190 IORING_OP_REMOVE_BUFFERS, 191 IORING_OP_TEE, 192 IORING_OP_SHUTDOWN, 193 IORING_OP_RENAMEAT, 194 IORING_OP_UNLINKAT, 195 IORING_OP_MKDIRAT, 196 IORING_OP_SYMLINKAT, 197 IORING_OP_LINKAT, 198 IORING_OP_MSG_RING, 199 IORING_OP_FSETXATTR, 200 IORING_OP_SETXATTR, 201 IORING_OP_FGETXATTR, 202 IORING_OP_GETXATTR, 203 IORING_OP_SOCKET, 204 IORING_OP_URING_CMD, 205 IORING_OP_SENDZC_NOTIF, 206 207 /* this goes last, obviously */ 208 IORING_OP_LAST, 209 }; 210 211 /* 212 * sqe->fsync_flags 213 */ 214 #define IORING_FSYNC_DATASYNC (1U << 0) 215 216 /* 217 * sqe->timeout_flags 218 */ 219 #define IORING_TIMEOUT_ABS (1U << 0) 220 #define IORING_TIMEOUT_UPDATE (1U << 1) 221 #define IORING_TIMEOUT_BOOTTIME (1U << 2) 222 #define IORING_TIMEOUT_REALTIME (1U << 3) 223 #define IORING_LINK_TIMEOUT_UPDATE (1U << 4) 224 #define IORING_TIMEOUT_ETIME_SUCCESS (1U << 5) 225 #define IORING_TIMEOUT_CLOCK_MASK (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME) 226 #define IORING_TIMEOUT_UPDATE_MASK (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE) 227 228 /* 229 * sqe->splice_flags 230 * extends splice(2) flags 231 */ 232 #define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */ 233 234 /* 235 * POLL_ADD flags. Note that since sqe->poll_events is the flag space, the 236 * command flags for POLL_ADD are stored in sqe->len. 237 * 238 * IORING_POLL_ADD_MULTI Multishot poll. Sets IORING_CQE_F_MORE if 239 * the poll handler will continue to report 240 * CQEs on behalf of the same SQE. 241 * 242 * IORING_POLL_UPDATE Update existing poll request, matching 243 * sqe->addr as the old user_data field. 244 * 245 * IORING_POLL_LEVEL Level triggered poll. 246 */ 247 #define IORING_POLL_ADD_MULTI (1U << 0) 248 #define IORING_POLL_UPDATE_EVENTS (1U << 1) 249 #define IORING_POLL_UPDATE_USER_DATA (1U << 2) 250 #define IORING_POLL_ADD_LEVEL (1U << 3) 251 252 /* 253 * ASYNC_CANCEL flags. 254 * 255 * IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key 256 * IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the 257 * request 'user_data' 258 * IORING_ASYNC_CANCEL_ANY Match any request 259 * IORING_ASYNC_CANCEL_FD_FIXED 'fd' passed in is a fixed descriptor 260 */ 261 #define IORING_ASYNC_CANCEL_ALL (1U << 0) 262 #define IORING_ASYNC_CANCEL_FD (1U << 1) 263 #define IORING_ASYNC_CANCEL_ANY (1U << 2) 264 #define IORING_ASYNC_CANCEL_FD_FIXED (1U << 3) 265 266 /* 267 * send/sendmsg and recv/recvmsg flags (sqe->ioprio) 268 * 269 * IORING_RECVSEND_POLL_FIRST If set, instead of first attempting to send 270 * or receive and arm poll if that yields an 271 * -EAGAIN result, arm poll upfront and skip 272 * the initial transfer attempt. 273 * 274 * IORING_RECV_MULTISHOT Multishot recv. Sets IORING_CQE_F_MORE if 275 * the handler will continue to report 276 * CQEs on behalf of the same SQE. 277 * 278 * IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in 279 * the buf_index field. 280 * 281 * IORING_RECVSEND_NOTIF_FLUSH Flush a notification after a successful 282 * successful. Only for zerocopy sends. 283 */ 284 #define IORING_RECVSEND_POLL_FIRST (1U << 0) 285 #define IORING_RECV_MULTISHOT (1U << 1) 286 #define IORING_RECVSEND_FIXED_BUF (1U << 2) 287 #define IORING_RECVSEND_NOTIF_FLUSH (1U << 3) 288 289 /* 290 * accept flags stored in sqe->ioprio 291 */ 292 #define IORING_ACCEPT_MULTISHOT (1U << 0) 293 294 295 /* 296 * IORING_OP_RSRC_UPDATE flags 297 */ 298 enum { 299 IORING_RSRC_UPDATE_FILES, 300 IORING_RSRC_UPDATE_NOTIF, 301 }; 302 303 /* 304 * IORING_OP_MSG_RING command types, stored in sqe->addr 305 */ 306 enum { 307 IORING_MSG_DATA, /* pass sqe->len as 'res' and off as user_data */ 308 IORING_MSG_SEND_FD, /* send a registered fd to another ring */ 309 }; 310 311 /* 312 * IORING_OP_MSG_RING flags (sqe->msg_ring_flags) 313 * 314 * IORING_MSG_RING_CQE_SKIP Don't post a CQE to the target ring. Not 315 * applicable for IORING_MSG_DATA, obviously. 316 */ 317 #define IORING_MSG_RING_CQE_SKIP (1U << 0) 318 319 /* 320 * IO completion data structure (Completion Queue Entry) 321 */ 322 struct io_uring_cqe { 323 __u64 user_data; /* sqe->data submission passed back */ 324 __s32 res; /* result code for this event */ 325 __u32 flags; 326 327 /* 328 * If the ring is initialized with IORING_SETUP_CQE32, then this field 329 * contains 16-bytes of padding, doubling the size of the CQE. 330 */ 331 __u64 big_cqe[]; 332 }; 333 334 /* 335 * cqe->flags 336 * 337 * IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID 338 * IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries 339 * IORING_CQE_F_SOCK_NONEMPTY If set, more data to read after socket recv 340 */ 341 #define IORING_CQE_F_BUFFER (1U << 0) 342 #define IORING_CQE_F_MORE (1U << 1) 343 #define IORING_CQE_F_SOCK_NONEMPTY (1U << 2) 344 345 enum { 346 IORING_CQE_BUFFER_SHIFT = 16, 347 }; 348 349 /* 350 * Magic offsets for the application to mmap the data it needs 351 */ 352 #define IORING_OFF_SQ_RING 0ULL 353 #define IORING_OFF_CQ_RING 0x8000000ULL 354 #define IORING_OFF_SQES 0x10000000ULL 355 356 /* 357 * Filled with the offset for mmap(2) 358 */ 359 struct io_sqring_offsets { 360 __u32 head; 361 __u32 tail; 362 __u32 ring_mask; 363 __u32 ring_entries; 364 __u32 flags; 365 __u32 dropped; 366 __u32 array; 367 __u32 resv1; 368 __u64 resv2; 369 }; 370 371 /* 372 * sq_ring->flags 373 */ 374 #define IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */ 375 #define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */ 376 #define IORING_SQ_TASKRUN (1U << 2) /* task should enter the kernel */ 377 378 struct io_cqring_offsets { 379 __u32 head; 380 __u32 tail; 381 __u32 ring_mask; 382 __u32 ring_entries; 383 __u32 overflow; 384 __u32 cqes; 385 __u32 flags; 386 __u32 resv1; 387 __u64 resv2; 388 }; 389 390 /* 391 * cq_ring->flags 392 */ 393 394 /* disable eventfd notifications */ 395 #define IORING_CQ_EVENTFD_DISABLED (1U << 0) 396 397 /* 398 * io_uring_enter(2) flags 399 */ 400 #define IORING_ENTER_GETEVENTS (1U << 0) 401 #define IORING_ENTER_SQ_WAKEUP (1U << 1) 402 #define IORING_ENTER_SQ_WAIT (1U << 2) 403 #define IORING_ENTER_EXT_ARG (1U << 3) 404 #define IORING_ENTER_REGISTERED_RING (1U << 4) 405 406 /* 407 * Passed in for io_uring_setup(2). Copied back with updated info on success 408 */ 409 struct io_uring_params { 410 __u32 sq_entries; 411 __u32 cq_entries; 412 __u32 flags; 413 __u32 sq_thread_cpu; 414 __u32 sq_thread_idle; 415 __u32 features; 416 __u32 wq_fd; 417 __u32 resv[3]; 418 struct io_sqring_offsets sq_off; 419 struct io_cqring_offsets cq_off; 420 }; 421 422 /* 423 * io_uring_params->features flags 424 */ 425 #define IORING_FEAT_SINGLE_MMAP (1U << 0) 426 #define IORING_FEAT_NODROP (1U << 1) 427 #define IORING_FEAT_SUBMIT_STABLE (1U << 2) 428 #define IORING_FEAT_RW_CUR_POS (1U << 3) 429 #define IORING_FEAT_CUR_PERSONALITY (1U << 4) 430 #define IORING_FEAT_FAST_POLL (1U << 5) 431 #define IORING_FEAT_POLL_32BITS (1U << 6) 432 #define IORING_FEAT_SQPOLL_NONFIXED (1U << 7) 433 #define IORING_FEAT_EXT_ARG (1U << 8) 434 #define IORING_FEAT_NATIVE_WORKERS (1U << 9) 435 #define IORING_FEAT_RSRC_TAGS (1U << 10) 436 #define IORING_FEAT_CQE_SKIP (1U << 11) 437 #define IORING_FEAT_LINKED_FILE (1U << 12) 438 439 /* 440 * io_uring_register(2) opcodes and arguments 441 */ 442 enum { 443 IORING_REGISTER_BUFFERS = 0, 444 IORING_UNREGISTER_BUFFERS = 1, 445 IORING_REGISTER_FILES = 2, 446 IORING_UNREGISTER_FILES = 3, 447 IORING_REGISTER_EVENTFD = 4, 448 IORING_UNREGISTER_EVENTFD = 5, 449 IORING_REGISTER_FILES_UPDATE = 6, 450 IORING_REGISTER_EVENTFD_ASYNC = 7, 451 IORING_REGISTER_PROBE = 8, 452 IORING_REGISTER_PERSONALITY = 9, 453 IORING_UNREGISTER_PERSONALITY = 10, 454 IORING_REGISTER_RESTRICTIONS = 11, 455 IORING_REGISTER_ENABLE_RINGS = 12, 456 457 /* extended with tagging */ 458 IORING_REGISTER_FILES2 = 13, 459 IORING_REGISTER_FILES_UPDATE2 = 14, 460 IORING_REGISTER_BUFFERS2 = 15, 461 IORING_REGISTER_BUFFERS_UPDATE = 16, 462 463 /* set/clear io-wq thread affinities */ 464 IORING_REGISTER_IOWQ_AFF = 17, 465 IORING_UNREGISTER_IOWQ_AFF = 18, 466 467 /* set/get max number of io-wq workers */ 468 IORING_REGISTER_IOWQ_MAX_WORKERS = 19, 469 470 /* register/unregister io_uring fd with the ring */ 471 IORING_REGISTER_RING_FDS = 20, 472 IORING_UNREGISTER_RING_FDS = 21, 473 474 /* register ring based provide buffer group */ 475 IORING_REGISTER_PBUF_RING = 22, 476 IORING_UNREGISTER_PBUF_RING = 23, 477 478 /* sync cancelation API */ 479 IORING_REGISTER_SYNC_CANCEL = 24, 480 481 /* register a range of fixed file slots for automatic slot allocation */ 482 IORING_REGISTER_FILE_ALLOC_RANGE = 25, 483 484 /* zerocopy notification API */ 485 IORING_REGISTER_NOTIFIERS = 26, 486 IORING_UNREGISTER_NOTIFIERS = 27, 487 488 /* this goes last */ 489 IORING_REGISTER_LAST 490 }; 491 492 /* io-wq worker categories */ 493 enum { 494 IO_WQ_BOUND, 495 IO_WQ_UNBOUND, 496 }; 497 498 /* deprecated, see struct io_uring_rsrc_update */ 499 struct io_uring_files_update { 500 __u32 offset; 501 __u32 resv; 502 __aligned_u64 /* __s32 * */ fds; 503 }; 504 505 /* 506 * Register a fully sparse file space, rather than pass in an array of all 507 * -1 file descriptors. 508 */ 509 #define IORING_RSRC_REGISTER_SPARSE (1U << 0) 510 511 struct io_uring_rsrc_register { 512 __u32 nr; 513 __u32 flags; 514 __u64 resv2; 515 __aligned_u64 data; 516 __aligned_u64 tags; 517 }; 518 519 struct io_uring_rsrc_update { 520 __u32 offset; 521 __u32 resv; 522 __aligned_u64 data; 523 }; 524 525 struct io_uring_rsrc_update2 { 526 __u32 offset; 527 __u32 resv; 528 __aligned_u64 data; 529 __aligned_u64 tags; 530 __u32 nr; 531 __u32 resv2; 532 }; 533 534 struct io_uring_notification_slot { 535 __u64 tag; 536 __u64 resv[3]; 537 }; 538 539 struct io_uring_notification_register { 540 __u32 nr_slots; 541 __u32 resv; 542 __u64 resv2; 543 __u64 data; 544 __u64 resv3; 545 }; 546 547 /* Skip updating fd indexes set to this value in the fd table */ 548 #define IORING_REGISTER_FILES_SKIP (-2) 549 550 #define IO_URING_OP_SUPPORTED (1U << 0) 551 552 struct io_uring_probe_op { 553 __u8 op; 554 __u8 resv; 555 __u16 flags; /* IO_URING_OP_* flags */ 556 __u32 resv2; 557 }; 558 559 struct io_uring_probe { 560 __u8 last_op; /* last opcode supported */ 561 __u8 ops_len; /* length of ops[] array below */ 562 __u16 resv; 563 __u32 resv2[3]; 564 struct io_uring_probe_op ops[]; 565 }; 566 567 struct io_uring_restriction { 568 __u16 opcode; 569 union { 570 __u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */ 571 __u8 sqe_op; /* IORING_RESTRICTION_SQE_OP */ 572 __u8 sqe_flags; /* IORING_RESTRICTION_SQE_FLAGS_* */ 573 }; 574 __u8 resv; 575 __u32 resv2[3]; 576 }; 577 578 struct io_uring_buf { 579 __u64 addr; 580 __u32 len; 581 __u16 bid; 582 __u16 resv; 583 }; 584 585 struct io_uring_buf_ring { 586 union { 587 /* 588 * To avoid spilling into more pages than we need to, the 589 * ring tail is overlaid with the io_uring_buf->resv field. 590 */ 591 struct { 592 __u64 resv1; 593 __u32 resv2; 594 __u16 resv3; 595 __u16 tail; 596 }; 597 struct io_uring_buf bufs[0]; 598 }; 599 }; 600 601 /* argument for IORING_(UN)REGISTER_PBUF_RING */ 602 struct io_uring_buf_reg { 603 __u64 ring_addr; 604 __u32 ring_entries; 605 __u16 bgid; 606 __u16 pad; 607 __u64 resv[3]; 608 }; 609 610 /* 611 * io_uring_restriction->opcode values 612 */ 613 enum { 614 /* Allow an io_uring_register(2) opcode */ 615 IORING_RESTRICTION_REGISTER_OP = 0, 616 617 /* Allow an sqe opcode */ 618 IORING_RESTRICTION_SQE_OP = 1, 619 620 /* Allow sqe flags */ 621 IORING_RESTRICTION_SQE_FLAGS_ALLOWED = 2, 622 623 /* Require sqe flags (these flags must be set on each submission) */ 624 IORING_RESTRICTION_SQE_FLAGS_REQUIRED = 3, 625 626 IORING_RESTRICTION_LAST 627 }; 628 629 struct io_uring_getevents_arg { 630 __u64 sigmask; 631 __u32 sigmask_sz; 632 __u32 pad; 633 __u64 ts; 634 }; 635 636 /* 637 * Argument for IORING_REGISTER_SYNC_CANCEL 638 */ 639 struct io_uring_sync_cancel_reg { 640 __u64 addr; 641 __s32 fd; 642 __u32 flags; 643 struct __kernel_timespec timeout; 644 __u64 pad[4]; 645 }; 646 647 /* 648 * Argument for IORING_REGISTER_FILE_ALLOC_RANGE 649 * The range is specified as [off, off + len) 650 */ 651 struct io_uring_file_index_range { 652 __u32 off; 653 __u32 len; 654 __u64 resv; 655 }; 656 657 struct io_uring_recvmsg_out { 658 __u32 namelen; 659 __u32 controllen; 660 __u32 payloadlen; 661 __u32 flags; 662 }; 663 664 #endif 665