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 #ifdef __cplusplus 16 extern "C" { 17 #endif 18 19 /* 20 * IO submission data structure (Submission Queue Entry) 21 */ 22 struct io_uring_sqe { 23 __u8 opcode; /* type of operation for this sqe */ 24 __u8 flags; /* IOSQE_ flags */ 25 __u16 ioprio; /* ioprio for the request */ 26 __s32 fd; /* file descriptor to do IO on */ 27 union { 28 __u64 off; /* offset into file */ 29 __u64 addr2; 30 struct { 31 __u32 cmd_op; 32 __u32 __pad1; 33 }; 34 }; 35 union { 36 __u64 addr; /* pointer to buffer or iovecs */ 37 __u64 splice_off_in; 38 }; 39 __u32 len; /* buffer size or number of iovecs */ 40 union { 41 __kernel_rwf_t rw_flags; 42 __u32 fsync_flags; 43 __u16 poll_events; /* compatibility */ 44 __u32 poll32_events; /* word-reversed for BE */ 45 __u32 sync_range_flags; 46 __u32 msg_flags; 47 __u32 timeout_flags; 48 __u32 accept_flags; 49 __u32 cancel_flags; 50 __u32 open_flags; 51 __u32 statx_flags; 52 __u32 fadvise_advice; 53 __u32 splice_flags; 54 __u32 rename_flags; 55 __u32 unlink_flags; 56 __u32 hardlink_flags; 57 __u32 xattr_flags; 58 __u32 msg_ring_flags; 59 }; 60 __u64 user_data; /* data to be passed back at completion time */ 61 /* pack this to avoid bogus arm OABI complaints */ 62 union { 63 /* index into fixed buffers, if used */ 64 __u16 buf_index; 65 /* for grouped buffer selection */ 66 __u16 buf_group; 67 } __attribute__((packed)); 68 /* personality to use, if used */ 69 __u16 personality; 70 union { 71 __s32 splice_fd_in; 72 __u32 file_index; 73 struct { 74 __u16 notification_idx; 75 __u16 addr_len; 76 }; 77 }; 78 union { 79 struct { 80 __u64 addr3; 81 __u64 __pad2[1]; 82 }; 83 /* 84 * If the ring is initialized with IORING_SETUP_SQE128, then 85 * this field is used for 80 bytes of arbitrary command data 86 */ 87 __u8 cmd[0]; 88 }; 89 }; 90 91 /* 92 * If sqe->file_index is set to this for opcodes that instantiate a new 93 * direct descriptor (like openat/openat2/accept), then io_uring will allocate 94 * an available direct descriptor instead of having the application pass one 95 * in. The picked direct descriptor will be returned in cqe->res, or -ENFILE 96 * if the space is full. 97 */ 98 #define IORING_FILE_INDEX_ALLOC (~0U) 99 100 enum { 101 IOSQE_FIXED_FILE_BIT, 102 IOSQE_IO_DRAIN_BIT, 103 IOSQE_IO_LINK_BIT, 104 IOSQE_IO_HARDLINK_BIT, 105 IOSQE_ASYNC_BIT, 106 IOSQE_BUFFER_SELECT_BIT, 107 IOSQE_CQE_SKIP_SUCCESS_BIT, 108 }; 109 110 /* 111 * sqe->flags 112 */ 113 /* use fixed fileset */ 114 #define IOSQE_FIXED_FILE (1U << IOSQE_FIXED_FILE_BIT) 115 /* issue after inflight IO */ 116 #define IOSQE_IO_DRAIN (1U << IOSQE_IO_DRAIN_BIT) 117 /* links next sqe */ 118 #define IOSQE_IO_LINK (1U << IOSQE_IO_LINK_BIT) 119 /* like LINK, but stronger */ 120 #define IOSQE_IO_HARDLINK (1U << IOSQE_IO_HARDLINK_BIT) 121 /* always go async */ 122 #define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT) 123 /* select buffer from sqe->buf_group */ 124 #define IOSQE_BUFFER_SELECT (1U << IOSQE_BUFFER_SELECT_BIT) 125 /* don't post CQE if request succeeded */ 126 #define IOSQE_CQE_SKIP_SUCCESS (1U << IOSQE_CQE_SKIP_SUCCESS_BIT) 127 128 /* 129 * io_uring_setup() flags 130 */ 131 #define IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */ 132 #define IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */ 133 #define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */ 134 #define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */ 135 #define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */ 136 #define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */ 137 #define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */ 138 #define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */ 139 /* 140 * Cooperative task running. When requests complete, they often require 141 * forcing the submitter to transition to the kernel to complete. If this 142 * flag is set, work will be done when the task transitions anyway, rather 143 * than force an inter-processor interrupt reschedule. This avoids interrupting 144 * a task running in userspace, and saves an IPI. 145 */ 146 #define IORING_SETUP_COOP_TASKRUN (1U << 8) 147 /* 148 * If COOP_TASKRUN is set, get notified if task work is available for 149 * running and a kernel transition would be needed to run it. This sets 150 * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN. 151 */ 152 #define IORING_SETUP_TASKRUN_FLAG (1U << 9) 153 #define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */ 154 #define IORING_SETUP_CQE32 (1U << 11) /* CQEs are 32 byte */ 155 /* 156 * Only one task is allowed to submit requests 157 */ 158 #define IORING_SETUP_SINGLE_ISSUER (1U << 12) 159 160 enum io_uring_op { 161 IORING_OP_NOP, 162 IORING_OP_READV, 163 IORING_OP_WRITEV, 164 IORING_OP_FSYNC, 165 IORING_OP_READ_FIXED, 166 IORING_OP_WRITE_FIXED, 167 IORING_OP_POLL_ADD, 168 IORING_OP_POLL_REMOVE, 169 IORING_OP_SYNC_FILE_RANGE, 170 IORING_OP_SENDMSG, 171 IORING_OP_RECVMSG, 172 IORING_OP_TIMEOUT, 173 IORING_OP_TIMEOUT_REMOVE, 174 IORING_OP_ACCEPT, 175 IORING_OP_ASYNC_CANCEL, 176 IORING_OP_LINK_TIMEOUT, 177 IORING_OP_CONNECT, 178 IORING_OP_FALLOCATE, 179 IORING_OP_OPENAT, 180 IORING_OP_CLOSE, 181 IORING_OP_RSRC_UPDATE, 182 IORING_OP_FILES_UPDATE = IORING_OP_RSRC_UPDATE, 183 IORING_OP_STATX, 184 IORING_OP_READ, 185 IORING_OP_WRITE, 186 IORING_OP_FADVISE, 187 IORING_OP_MADVISE, 188 IORING_OP_SEND, 189 IORING_OP_RECV, 190 IORING_OP_OPENAT2, 191 IORING_OP_EPOLL_CTL, 192 IORING_OP_SPLICE, 193 IORING_OP_PROVIDE_BUFFERS, 194 IORING_OP_REMOVE_BUFFERS, 195 IORING_OP_TEE, 196 IORING_OP_SHUTDOWN, 197 IORING_OP_RENAMEAT, 198 IORING_OP_UNLINKAT, 199 IORING_OP_MKDIRAT, 200 IORING_OP_SYMLINKAT, 201 IORING_OP_LINKAT, 202 IORING_OP_MSG_RING, 203 IORING_OP_FSETXATTR, 204 IORING_OP_SETXATTR, 205 IORING_OP_FGETXATTR, 206 IORING_OP_GETXATTR, 207 IORING_OP_SOCKET, 208 IORING_OP_URING_CMD, 209 IORING_OP_SENDZC_NOTIF, 210 211 /* this goes last, obviously */ 212 IORING_OP_LAST, 213 }; 214 215 /* 216 * sqe->fsync_flags 217 */ 218 #define IORING_FSYNC_DATASYNC (1U << 0) 219 220 /* 221 * sqe->timeout_flags 222 */ 223 #define IORING_TIMEOUT_ABS (1U << 0) 224 #define IORING_TIMEOUT_UPDATE (1U << 1) 225 #define IORING_TIMEOUT_BOOTTIME (1U << 2) 226 #define IORING_TIMEOUT_REALTIME (1U << 3) 227 #define IORING_LINK_TIMEOUT_UPDATE (1U << 4) 228 #define IORING_TIMEOUT_ETIME_SUCCESS (1U << 5) 229 #define IORING_TIMEOUT_CLOCK_MASK (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME) 230 #define IORING_TIMEOUT_UPDATE_MASK (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE) 231 232 /* 233 * sqe->splice_flags 234 * extends splice(2) flags 235 */ 236 #define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */ 237 238 /* 239 * POLL_ADD flags. Note that since sqe->poll_events is the flag space, the 240 * command flags for POLL_ADD are stored in sqe->len. 241 * 242 * IORING_POLL_ADD_MULTI Multishot poll. Sets IORING_CQE_F_MORE if 243 * the poll handler will continue to report 244 * CQEs on behalf of the same SQE. 245 * 246 * IORING_POLL_UPDATE Update existing poll request, matching 247 * sqe->addr as the old user_data field. 248 * 249 * IORING_POLL_LEVEL Level triggered poll. 250 */ 251 #define IORING_POLL_ADD_MULTI (1U << 0) 252 #define IORING_POLL_UPDATE_EVENTS (1U << 1) 253 #define IORING_POLL_UPDATE_USER_DATA (1U << 2) 254 #define IORING_POLL_ADD_LEVEL (1U << 3) 255 256 /* 257 * ASYNC_CANCEL flags. 258 * 259 * IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key 260 * IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the 261 * request 'user_data' 262 * IORING_ASYNC_CANCEL_ANY Match any request 263 * IORING_ASYNC_CANCEL_FD_FIXED 'fd' passed in is a fixed descriptor 264 */ 265 #define IORING_ASYNC_CANCEL_ALL (1U << 0) 266 #define IORING_ASYNC_CANCEL_FD (1U << 1) 267 #define IORING_ASYNC_CANCEL_ANY (1U << 2) 268 #define IORING_ASYNC_CANCEL_FD_FIXED (1U << 3) 269 270 /* 271 * send/sendmsg and recv/recvmsg flags (sqe->ioprio) 272 * 273 * IORING_RECVSEND_POLL_FIRST If set, instead of first attempting to send 274 * or receive and arm poll if that yields an 275 * -EAGAIN result, arm poll upfront and skip 276 * the initial transfer attempt. 277 * 278 * IORING_RECV_MULTISHOT Multishot recv. Sets IORING_CQE_F_MORE if 279 * the handler will continue to report 280 * CQEs on behalf of the same SQE. 281 * 282 * IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in 283 * the buf_index field. 284 * 285 * IORING_RECVSEND_NOTIF_FLUSH Flush a notification after a successful 286 * successful. Only for zerocopy sends. 287 */ 288 #define IORING_RECVSEND_POLL_FIRST (1U << 0) 289 #define IORING_RECV_MULTISHOT (1U << 1) 290 #define IORING_RECVSEND_FIXED_BUF (1U << 2) 291 #define IORING_RECVSEND_NOTIF_FLUSH (1U << 3) 292 293 /* 294 * accept flags stored in sqe->ioprio 295 */ 296 #define IORING_ACCEPT_MULTISHOT (1U << 0) 297 298 299 /* 300 * IORING_OP_RSRC_UPDATE flags 301 */ 302 enum { 303 IORING_RSRC_UPDATE_FILES, 304 IORING_RSRC_UPDATE_NOTIF, 305 }; 306 307 /* 308 * IORING_OP_MSG_RING command types, stored in sqe->addr 309 */ 310 enum { 311 IORING_MSG_DATA, /* pass sqe->len as 'res' and off as user_data */ 312 IORING_MSG_SEND_FD, /* send a registered fd to another ring */ 313 }; 314 315 /* 316 * IORING_OP_MSG_RING flags (sqe->msg_ring_flags) 317 * 318 * IORING_MSG_RING_CQE_SKIP Don't post a CQE to the target ring. Not 319 * applicable for IORING_MSG_DATA, obviously. 320 */ 321 #define IORING_MSG_RING_CQE_SKIP (1U << 0) 322 323 /* 324 * IO completion data structure (Completion Queue Entry) 325 */ 326 struct io_uring_cqe { 327 __u64 user_data; /* sqe->data submission passed back */ 328 __s32 res; /* result code for this event */ 329 __u32 flags; 330 331 /* 332 * If the ring is initialized with IORING_SETUP_CQE32, then this field 333 * contains 16-bytes of padding, doubling the size of the CQE. 334 */ 335 __u64 big_cqe[]; 336 }; 337 338 /* 339 * cqe->flags 340 * 341 * IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID 342 * IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries 343 * IORING_CQE_F_SOCK_NONEMPTY If set, more data to read after socket recv 344 */ 345 #define IORING_CQE_F_BUFFER (1U << 0) 346 #define IORING_CQE_F_MORE (1U << 1) 347 #define IORING_CQE_F_SOCK_NONEMPTY (1U << 2) 348 349 enum { 350 IORING_CQE_BUFFER_SHIFT = 16, 351 }; 352 353 /* 354 * Magic offsets for the application to mmap the data it needs 355 */ 356 #define IORING_OFF_SQ_RING 0ULL 357 #define IORING_OFF_CQ_RING 0x8000000ULL 358 #define IORING_OFF_SQES 0x10000000ULL 359 360 /* 361 * Filled with the offset for mmap(2) 362 */ 363 struct io_sqring_offsets { 364 __u32 head; 365 __u32 tail; 366 __u32 ring_mask; 367 __u32 ring_entries; 368 __u32 flags; 369 __u32 dropped; 370 __u32 array; 371 __u32 resv1; 372 __u64 resv2; 373 }; 374 375 /* 376 * sq_ring->flags 377 */ 378 #define IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */ 379 #define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */ 380 #define IORING_SQ_TASKRUN (1U << 2) /* task should enter the kernel */ 381 382 struct io_cqring_offsets { 383 __u32 head; 384 __u32 tail; 385 __u32 ring_mask; 386 __u32 ring_entries; 387 __u32 overflow; 388 __u32 cqes; 389 __u32 flags; 390 __u32 resv1; 391 __u64 resv2; 392 }; 393 394 /* 395 * cq_ring->flags 396 */ 397 398 /* disable eventfd notifications */ 399 #define IORING_CQ_EVENTFD_DISABLED (1U << 0) 400 401 /* 402 * io_uring_enter(2) flags 403 */ 404 #define IORING_ENTER_GETEVENTS (1U << 0) 405 #define IORING_ENTER_SQ_WAKEUP (1U << 1) 406 #define IORING_ENTER_SQ_WAIT (1U << 2) 407 #define IORING_ENTER_EXT_ARG (1U << 3) 408 #define IORING_ENTER_REGISTERED_RING (1U << 4) 409 410 /* 411 * Passed in for io_uring_setup(2). Copied back with updated info on success 412 */ 413 struct io_uring_params { 414 __u32 sq_entries; 415 __u32 cq_entries; 416 __u32 flags; 417 __u32 sq_thread_cpu; 418 __u32 sq_thread_idle; 419 __u32 features; 420 __u32 wq_fd; 421 __u32 resv[3]; 422 struct io_sqring_offsets sq_off; 423 struct io_cqring_offsets cq_off; 424 }; 425 426 /* 427 * io_uring_params->features flags 428 */ 429 #define IORING_FEAT_SINGLE_MMAP (1U << 0) 430 #define IORING_FEAT_NODROP (1U << 1) 431 #define IORING_FEAT_SUBMIT_STABLE (1U << 2) 432 #define IORING_FEAT_RW_CUR_POS (1U << 3) 433 #define IORING_FEAT_CUR_PERSONALITY (1U << 4) 434 #define IORING_FEAT_FAST_POLL (1U << 5) 435 #define IORING_FEAT_POLL_32BITS (1U << 6) 436 #define IORING_FEAT_SQPOLL_NONFIXED (1U << 7) 437 #define IORING_FEAT_EXT_ARG (1U << 8) 438 #define IORING_FEAT_NATIVE_WORKERS (1U << 9) 439 #define IORING_FEAT_RSRC_TAGS (1U << 10) 440 #define IORING_FEAT_CQE_SKIP (1U << 11) 441 #define IORING_FEAT_LINKED_FILE (1U << 12) 442 443 /* 444 * io_uring_register(2) opcodes and arguments 445 */ 446 enum { 447 IORING_REGISTER_BUFFERS = 0, 448 IORING_UNREGISTER_BUFFERS = 1, 449 IORING_REGISTER_FILES = 2, 450 IORING_UNREGISTER_FILES = 3, 451 IORING_REGISTER_EVENTFD = 4, 452 IORING_UNREGISTER_EVENTFD = 5, 453 IORING_REGISTER_FILES_UPDATE = 6, 454 IORING_REGISTER_EVENTFD_ASYNC = 7, 455 IORING_REGISTER_PROBE = 8, 456 IORING_REGISTER_PERSONALITY = 9, 457 IORING_UNREGISTER_PERSONALITY = 10, 458 IORING_REGISTER_RESTRICTIONS = 11, 459 IORING_REGISTER_ENABLE_RINGS = 12, 460 461 /* extended with tagging */ 462 IORING_REGISTER_FILES2 = 13, 463 IORING_REGISTER_FILES_UPDATE2 = 14, 464 IORING_REGISTER_BUFFERS2 = 15, 465 IORING_REGISTER_BUFFERS_UPDATE = 16, 466 467 /* set/clear io-wq thread affinities */ 468 IORING_REGISTER_IOWQ_AFF = 17, 469 IORING_UNREGISTER_IOWQ_AFF = 18, 470 471 /* set/get max number of io-wq workers */ 472 IORING_REGISTER_IOWQ_MAX_WORKERS = 19, 473 474 /* register/unregister io_uring fd with the ring */ 475 IORING_REGISTER_RING_FDS = 20, 476 IORING_UNREGISTER_RING_FDS = 21, 477 478 /* register ring based provide buffer group */ 479 IORING_REGISTER_PBUF_RING = 22, 480 IORING_UNREGISTER_PBUF_RING = 23, 481 482 /* sync cancelation API */ 483 IORING_REGISTER_SYNC_CANCEL = 24, 484 485 /* register a range of fixed file slots for automatic slot allocation */ 486 IORING_REGISTER_FILE_ALLOC_RANGE = 25, 487 488 /* zerocopy notification API */ 489 IORING_REGISTER_NOTIFIERS = 26, 490 IORING_UNREGISTER_NOTIFIERS = 27, 491 492 /* this goes last */ 493 IORING_REGISTER_LAST 494 }; 495 496 /* io-wq worker categories */ 497 enum { 498 IO_WQ_BOUND, 499 IO_WQ_UNBOUND, 500 }; 501 502 /* deprecated, see struct io_uring_rsrc_update */ 503 struct io_uring_files_update { 504 __u32 offset; 505 __u32 resv; 506 __aligned_u64 /* __s32 * */ fds; 507 }; 508 509 /* 510 * Register a fully sparse file space, rather than pass in an array of all 511 * -1 file descriptors. 512 */ 513 #define IORING_RSRC_REGISTER_SPARSE (1U << 0) 514 515 struct io_uring_rsrc_register { 516 __u32 nr; 517 __u32 flags; 518 __u64 resv2; 519 __aligned_u64 data; 520 __aligned_u64 tags; 521 }; 522 523 struct io_uring_rsrc_update { 524 __u32 offset; 525 __u32 resv; 526 __aligned_u64 data; 527 }; 528 529 struct io_uring_rsrc_update2 { 530 __u32 offset; 531 __u32 resv; 532 __aligned_u64 data; 533 __aligned_u64 tags; 534 __u32 nr; 535 __u32 resv2; 536 }; 537 538 struct io_uring_notification_slot { 539 __u64 tag; 540 __u64 resv[3]; 541 }; 542 543 struct io_uring_notification_register { 544 __u32 nr_slots; 545 __u32 resv; 546 __u64 resv2; 547 __u64 data; 548 __u64 resv3; 549 }; 550 551 /* Skip updating fd indexes set to this value in the fd table */ 552 #define IORING_REGISTER_FILES_SKIP (-2) 553 554 #define IO_URING_OP_SUPPORTED (1U << 0) 555 556 struct io_uring_probe_op { 557 __u8 op; 558 __u8 resv; 559 __u16 flags; /* IO_URING_OP_* flags */ 560 __u32 resv2; 561 }; 562 563 struct io_uring_probe { 564 __u8 last_op; /* last opcode supported */ 565 __u8 ops_len; /* length of ops[] array below */ 566 __u16 resv; 567 __u32 resv2[3]; 568 struct io_uring_probe_op ops[]; 569 }; 570 571 struct io_uring_restriction { 572 __u16 opcode; 573 union { 574 __u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */ 575 __u8 sqe_op; /* IORING_RESTRICTION_SQE_OP */ 576 __u8 sqe_flags; /* IORING_RESTRICTION_SQE_FLAGS_* */ 577 }; 578 __u8 resv; 579 __u32 resv2[3]; 580 }; 581 582 struct io_uring_buf { 583 __u64 addr; 584 __u32 len; 585 __u16 bid; 586 __u16 resv; 587 }; 588 589 struct io_uring_buf_ring { 590 union { 591 /* 592 * To avoid spilling into more pages than we need to, the 593 * ring tail is overlaid with the io_uring_buf->resv field. 594 */ 595 struct { 596 __u64 resv1; 597 __u32 resv2; 598 __u16 resv3; 599 __u16 tail; 600 }; 601 struct io_uring_buf bufs[0]; 602 }; 603 }; 604 605 /* argument for IORING_(UN)REGISTER_PBUF_RING */ 606 struct io_uring_buf_reg { 607 __u64 ring_addr; 608 __u32 ring_entries; 609 __u16 bgid; 610 __u16 pad; 611 __u64 resv[3]; 612 }; 613 614 /* 615 * io_uring_restriction->opcode values 616 */ 617 enum { 618 /* Allow an io_uring_register(2) opcode */ 619 IORING_RESTRICTION_REGISTER_OP = 0, 620 621 /* Allow an sqe opcode */ 622 IORING_RESTRICTION_SQE_OP = 1, 623 624 /* Allow sqe flags */ 625 IORING_RESTRICTION_SQE_FLAGS_ALLOWED = 2, 626 627 /* Require sqe flags (these flags must be set on each submission) */ 628 IORING_RESTRICTION_SQE_FLAGS_REQUIRED = 3, 629 630 IORING_RESTRICTION_LAST 631 }; 632 633 struct io_uring_getevents_arg { 634 __u64 sigmask; 635 __u32 sigmask_sz; 636 __u32 pad; 637 __u64 ts; 638 }; 639 640 /* 641 * Argument for IORING_REGISTER_SYNC_CANCEL 642 */ 643 struct io_uring_sync_cancel_reg { 644 __u64 addr; 645 __s32 fd; 646 __u32 flags; 647 struct __kernel_timespec timeout; 648 __u64 pad[4]; 649 }; 650 651 /* 652 * Argument for IORING_REGISTER_FILE_ALLOC_RANGE 653 * The range is specified as [off, off + len) 654 */ 655 struct io_uring_file_index_range { 656 __u32 off; 657 __u32 len; 658 __u64 resv; 659 }; 660 661 struct io_uring_recvmsg_out { 662 __u32 namelen; 663 __u32 controllen; 664 __u32 payloadlen; 665 __u32 flags; 666 }; 667 668 #ifdef __cplusplus 669 } 670 #endif 671 672 #endif 673