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 /* 14 * this file is shared with liburing and that has to autodetect 15 * if linux/time_types.h is available or not, it can 16 * define UAPI_LINUX_IO_URING_H_SKIP_LINUX_TIME_TYPES_H 17 * if linux/time_types.h is not available 18 */ 19 #ifndef UAPI_LINUX_IO_URING_H_SKIP_LINUX_TIME_TYPES_H 20 #include <linux/time_types.h> 21 #endif 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 /* 28 * IO submission data structure (Submission Queue Entry) 29 */ 30 struct io_uring_sqe { 31 __u8 opcode; /* type of operation for this sqe */ 32 __u8 flags; /* IOSQE_ flags */ 33 __u16 ioprio; /* ioprio for the request */ 34 __s32 fd; /* file descriptor to do IO on */ 35 union { 36 __u64 off; /* offset into file */ 37 __u64 addr2; 38 struct { 39 __u32 cmd_op; 40 __u32 __pad1; 41 }; 42 }; 43 union { 44 __u64 addr; /* pointer to buffer or iovecs */ 45 __u64 splice_off_in; 46 }; 47 __u32 len; /* buffer size or number of iovecs */ 48 union { 49 __kernel_rwf_t rw_flags; 50 __u32 fsync_flags; 51 __u16 poll_events; /* compatibility */ 52 __u32 poll32_events; /* word-reversed for BE */ 53 __u32 sync_range_flags; 54 __u32 msg_flags; 55 __u32 timeout_flags; 56 __u32 accept_flags; 57 __u32 cancel_flags; 58 __u32 open_flags; 59 __u32 statx_flags; 60 __u32 fadvise_advice; 61 __u32 splice_flags; 62 __u32 rename_flags; 63 __u32 unlink_flags; 64 __u32 hardlink_flags; 65 __u32 xattr_flags; 66 __u32 msg_ring_flags; 67 __u32 uring_cmd_flags; 68 }; 69 __u64 user_data; /* data to be passed back at completion time */ 70 /* pack this to avoid bogus arm OABI complaints */ 71 union { 72 /* index into fixed buffers, if used */ 73 __u16 buf_index; 74 /* for grouped buffer selection */ 75 __u16 buf_group; 76 } __attribute__((packed)); 77 /* personality to use, if used */ 78 __u16 personality; 79 union { 80 __s32 splice_fd_in; 81 __u32 file_index; 82 struct { 83 __u16 addr_len; 84 __u16 __pad3[1]; 85 }; 86 }; 87 union { 88 struct { 89 __u64 addr3; 90 __u64 __pad2[1]; 91 }; 92 /* 93 * If the ring is initialized with IORING_SETUP_SQE128, then 94 * this field is used for 80 bytes of arbitrary command data 95 */ 96 __u8 cmd[0]; 97 }; 98 }; 99 100 /* 101 * If sqe->file_index is set to this for opcodes that instantiate a new 102 * direct descriptor (like openat/openat2/accept), then io_uring will allocate 103 * an available direct descriptor instead of having the application pass one 104 * in. The picked direct descriptor will be returned in cqe->res, or -ENFILE 105 * if the space is full. 106 */ 107 #define IORING_FILE_INDEX_ALLOC (~0U) 108 109 enum { 110 IOSQE_FIXED_FILE_BIT, 111 IOSQE_IO_DRAIN_BIT, 112 IOSQE_IO_LINK_BIT, 113 IOSQE_IO_HARDLINK_BIT, 114 IOSQE_ASYNC_BIT, 115 IOSQE_BUFFER_SELECT_BIT, 116 IOSQE_CQE_SKIP_SUCCESS_BIT, 117 }; 118 119 /* 120 * sqe->flags 121 */ 122 /* use fixed fileset */ 123 #define IOSQE_FIXED_FILE (1U << IOSQE_FIXED_FILE_BIT) 124 /* issue after inflight IO */ 125 #define IOSQE_IO_DRAIN (1U << IOSQE_IO_DRAIN_BIT) 126 /* links next sqe */ 127 #define IOSQE_IO_LINK (1U << IOSQE_IO_LINK_BIT) 128 /* like LINK, but stronger */ 129 #define IOSQE_IO_HARDLINK (1U << IOSQE_IO_HARDLINK_BIT) 130 /* always go async */ 131 #define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT) 132 /* select buffer from sqe->buf_group */ 133 #define IOSQE_BUFFER_SELECT (1U << IOSQE_BUFFER_SELECT_BIT) 134 /* don't post CQE if request succeeded */ 135 #define IOSQE_CQE_SKIP_SUCCESS (1U << IOSQE_CQE_SKIP_SUCCESS_BIT) 136 137 /* 138 * io_uring_setup() flags 139 */ 140 #define IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */ 141 #define IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */ 142 #define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */ 143 #define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */ 144 #define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */ 145 #define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */ 146 #define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */ 147 #define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */ 148 /* 149 * Cooperative task running. When requests complete, they often require 150 * forcing the submitter to transition to the kernel to complete. If this 151 * flag is set, work will be done when the task transitions anyway, rather 152 * than force an inter-processor interrupt reschedule. This avoids interrupting 153 * a task running in userspace, and saves an IPI. 154 */ 155 #define IORING_SETUP_COOP_TASKRUN (1U << 8) 156 /* 157 * If COOP_TASKRUN is set, get notified if task work is available for 158 * running and a kernel transition would be needed to run it. This sets 159 * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN. 160 */ 161 #define IORING_SETUP_TASKRUN_FLAG (1U << 9) 162 #define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */ 163 #define IORING_SETUP_CQE32 (1U << 11) /* CQEs are 32 byte */ 164 /* 165 * Only one task is allowed to submit requests 166 */ 167 #define IORING_SETUP_SINGLE_ISSUER (1U << 12) 168 169 /* 170 * Defer running task work to get events. 171 * Rather than running bits of task work whenever the task transitions 172 * try to do it just before it is needed. 173 */ 174 #define IORING_SETUP_DEFER_TASKRUN (1U << 13) 175 176 /* 177 * Application provides the memory for the rings 178 */ 179 #define IORING_SETUP_NO_MMAP (1U << 14) 180 181 /* 182 * Register the ring fd in itself for use with 183 * IORING_REGISTER_USE_REGISTERED_RING; return a registered fd index rather 184 * than an fd. 185 */ 186 #define IORING_SETUP_REGISTERED_FD_ONLY (1U << 15) 187 188 enum io_uring_op { 189 IORING_OP_NOP, 190 IORING_OP_READV, 191 IORING_OP_WRITEV, 192 IORING_OP_FSYNC, 193 IORING_OP_READ_FIXED, 194 IORING_OP_WRITE_FIXED, 195 IORING_OP_POLL_ADD, 196 IORING_OP_POLL_REMOVE, 197 IORING_OP_SYNC_FILE_RANGE, 198 IORING_OP_SENDMSG, 199 IORING_OP_RECVMSG, 200 IORING_OP_TIMEOUT, 201 IORING_OP_TIMEOUT_REMOVE, 202 IORING_OP_ACCEPT, 203 IORING_OP_ASYNC_CANCEL, 204 IORING_OP_LINK_TIMEOUT, 205 IORING_OP_CONNECT, 206 IORING_OP_FALLOCATE, 207 IORING_OP_OPENAT, 208 IORING_OP_CLOSE, 209 IORING_OP_FILES_UPDATE, 210 IORING_OP_STATX, 211 IORING_OP_READ, 212 IORING_OP_WRITE, 213 IORING_OP_FADVISE, 214 IORING_OP_MADVISE, 215 IORING_OP_SEND, 216 IORING_OP_RECV, 217 IORING_OP_OPENAT2, 218 IORING_OP_EPOLL_CTL, 219 IORING_OP_SPLICE, 220 IORING_OP_PROVIDE_BUFFERS, 221 IORING_OP_REMOVE_BUFFERS, 222 IORING_OP_TEE, 223 IORING_OP_SHUTDOWN, 224 IORING_OP_RENAMEAT, 225 IORING_OP_UNLINKAT, 226 IORING_OP_MKDIRAT, 227 IORING_OP_SYMLINKAT, 228 IORING_OP_LINKAT, 229 IORING_OP_MSG_RING, 230 IORING_OP_FSETXATTR, 231 IORING_OP_SETXATTR, 232 IORING_OP_FGETXATTR, 233 IORING_OP_GETXATTR, 234 IORING_OP_SOCKET, 235 IORING_OP_URING_CMD, 236 IORING_OP_SEND_ZC, 237 IORING_OP_SENDMSG_ZC, 238 239 /* this goes last, obviously */ 240 IORING_OP_LAST, 241 }; 242 243 /* 244 * sqe->uring_cmd_flags 245 * IORING_URING_CMD_FIXED use registered buffer; pass this flag 246 * along with setting sqe->buf_index. 247 */ 248 #define IORING_URING_CMD_FIXED (1U << 0) 249 250 251 /* 252 * sqe->fsync_flags 253 */ 254 #define IORING_FSYNC_DATASYNC (1U << 0) 255 256 /* 257 * sqe->timeout_flags 258 */ 259 #define IORING_TIMEOUT_ABS (1U << 0) 260 #define IORING_TIMEOUT_UPDATE (1U << 1) 261 #define IORING_TIMEOUT_BOOTTIME (1U << 2) 262 #define IORING_TIMEOUT_REALTIME (1U << 3) 263 #define IORING_LINK_TIMEOUT_UPDATE (1U << 4) 264 #define IORING_TIMEOUT_ETIME_SUCCESS (1U << 5) 265 #define IORING_TIMEOUT_MULTISHOT (1U << 6) 266 #define IORING_TIMEOUT_CLOCK_MASK (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME) 267 #define IORING_TIMEOUT_UPDATE_MASK (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE) 268 /* 269 * sqe->splice_flags 270 * extends splice(2) flags 271 */ 272 #define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */ 273 274 /* 275 * POLL_ADD flags. Note that since sqe->poll_events is the flag space, the 276 * command flags for POLL_ADD are stored in sqe->len. 277 * 278 * IORING_POLL_ADD_MULTI Multishot poll. Sets IORING_CQE_F_MORE if 279 * the poll handler will continue to report 280 * CQEs on behalf of the same SQE. 281 * 282 * IORING_POLL_UPDATE Update existing poll request, matching 283 * sqe->addr as the old user_data field. 284 * 285 * IORING_POLL_LEVEL Level triggered poll. 286 */ 287 #define IORING_POLL_ADD_MULTI (1U << 0) 288 #define IORING_POLL_UPDATE_EVENTS (1U << 1) 289 #define IORING_POLL_UPDATE_USER_DATA (1U << 2) 290 #define IORING_POLL_ADD_LEVEL (1U << 3) 291 292 /* 293 * ASYNC_CANCEL flags. 294 * 295 * IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key 296 * IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the 297 * request 'user_data' 298 * IORING_ASYNC_CANCEL_ANY Match any request 299 * IORING_ASYNC_CANCEL_FD_FIXED 'fd' passed in is a fixed descriptor 300 */ 301 #define IORING_ASYNC_CANCEL_ALL (1U << 0) 302 #define IORING_ASYNC_CANCEL_FD (1U << 1) 303 #define IORING_ASYNC_CANCEL_ANY (1U << 2) 304 #define IORING_ASYNC_CANCEL_FD_FIXED (1U << 3) 305 306 /* 307 * send/sendmsg and recv/recvmsg flags (sqe->ioprio) 308 * 309 * IORING_RECVSEND_POLL_FIRST If set, instead of first attempting to send 310 * or receive and arm poll if that yields an 311 * -EAGAIN result, arm poll upfront and skip 312 * the initial transfer attempt. 313 * 314 * IORING_RECV_MULTISHOT Multishot recv. Sets IORING_CQE_F_MORE if 315 * the handler will continue to report 316 * CQEs on behalf of the same SQE. 317 * 318 * IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in 319 * the buf_index field. 320 * 321 * IORING_SEND_ZC_REPORT_USAGE 322 * If set, SEND[MSG]_ZC should report 323 * the zerocopy usage in cqe.res 324 * for the IORING_CQE_F_NOTIF cqe. 325 * 0 is reported if zerocopy was actually possible. 326 * IORING_NOTIF_USAGE_ZC_COPIED if data was copied 327 * (at least partially). 328 */ 329 #define IORING_RECVSEND_POLL_FIRST (1U << 0) 330 #define IORING_RECV_MULTISHOT (1U << 1) 331 #define IORING_RECVSEND_FIXED_BUF (1U << 2) 332 #define IORING_SEND_ZC_REPORT_USAGE (1U << 3) 333 334 /* 335 * cqe.res for IORING_CQE_F_NOTIF if 336 * IORING_SEND_ZC_REPORT_USAGE was requested 337 * 338 * It should be treated as a flag, all other 339 * bits of cqe.res should be treated as reserved! 340 */ 341 #define IORING_NOTIF_USAGE_ZC_COPIED (1U << 31) 342 343 /* 344 * accept flags stored in sqe->ioprio 345 */ 346 #define IORING_ACCEPT_MULTISHOT (1U << 0) 347 348 /* 349 * IORING_OP_MSG_RING command types, stored in sqe->addr 350 */ 351 enum { 352 IORING_MSG_DATA, /* pass sqe->len as 'res' and off as user_data */ 353 IORING_MSG_SEND_FD, /* send a registered fd to another ring */ 354 }; 355 356 /* 357 * IORING_OP_MSG_RING flags (sqe->msg_ring_flags) 358 * 359 * IORING_MSG_RING_CQE_SKIP Don't post a CQE to the target ring. Not 360 * applicable for IORING_MSG_DATA, obviously. 361 */ 362 #define IORING_MSG_RING_CQE_SKIP (1U << 0) 363 /* Pass through the flags from sqe->file_index to cqe->flags */ 364 #define IORING_MSG_RING_FLAGS_PASS (1U << 1) 365 366 /* 367 * IO completion data structure (Completion Queue Entry) 368 */ 369 struct io_uring_cqe { 370 __u64 user_data; /* sqe->data submission passed back */ 371 __s32 res; /* result code for this event */ 372 __u32 flags; 373 374 /* 375 * If the ring is initialized with IORING_SETUP_CQE32, then this field 376 * contains 16-bytes of padding, doubling the size of the CQE. 377 */ 378 __u64 big_cqe[]; 379 }; 380 381 /* 382 * cqe->flags 383 * 384 * IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID 385 * IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries 386 * IORING_CQE_F_SOCK_NONEMPTY If set, more data to read after socket recv 387 * IORING_CQE_F_NOTIF Set for notification CQEs. Can be used to distinct 388 * them from sends. 389 */ 390 #define IORING_CQE_F_BUFFER (1U << 0) 391 #define IORING_CQE_F_MORE (1U << 1) 392 #define IORING_CQE_F_SOCK_NONEMPTY (1U << 2) 393 #define IORING_CQE_F_NOTIF (1U << 3) 394 395 enum { 396 IORING_CQE_BUFFER_SHIFT = 16, 397 }; 398 399 /* 400 * Magic offsets for the application to mmap the data it needs 401 */ 402 #define IORING_OFF_SQ_RING 0ULL 403 #define IORING_OFF_CQ_RING 0x8000000ULL 404 #define IORING_OFF_SQES 0x10000000ULL 405 #define IORING_OFF_PBUF_RING 0x80000000ULL 406 #define IORING_OFF_PBUF_SHIFT 16 407 #define IORING_OFF_MMAP_MASK 0xf8000000ULL 408 409 /* 410 * Filled with the offset for mmap(2) 411 */ 412 struct io_sqring_offsets { 413 __u32 head; 414 __u32 tail; 415 __u32 ring_mask; 416 __u32 ring_entries; 417 __u32 flags; 418 __u32 dropped; 419 __u32 array; 420 __u32 resv1; 421 __u64 user_addr; 422 }; 423 424 /* 425 * sq_ring->flags 426 */ 427 #define IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */ 428 #define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */ 429 #define IORING_SQ_TASKRUN (1U << 2) /* task should enter the kernel */ 430 431 struct io_cqring_offsets { 432 __u32 head; 433 __u32 tail; 434 __u32 ring_mask; 435 __u32 ring_entries; 436 __u32 overflow; 437 __u32 cqes; 438 __u32 flags; 439 __u32 resv1; 440 __u64 user_addr; 441 }; 442 443 /* 444 * cq_ring->flags 445 */ 446 447 /* disable eventfd notifications */ 448 #define IORING_CQ_EVENTFD_DISABLED (1U << 0) 449 450 /* 451 * io_uring_enter(2) flags 452 */ 453 #define IORING_ENTER_GETEVENTS (1U << 0) 454 #define IORING_ENTER_SQ_WAKEUP (1U << 1) 455 #define IORING_ENTER_SQ_WAIT (1U << 2) 456 #define IORING_ENTER_EXT_ARG (1U << 3) 457 #define IORING_ENTER_REGISTERED_RING (1U << 4) 458 459 /* 460 * Passed in for io_uring_setup(2). Copied back with updated info on success 461 */ 462 struct io_uring_params { 463 __u32 sq_entries; 464 __u32 cq_entries; 465 __u32 flags; 466 __u32 sq_thread_cpu; 467 __u32 sq_thread_idle; 468 __u32 features; 469 __u32 wq_fd; 470 __u32 resv[3]; 471 struct io_sqring_offsets sq_off; 472 struct io_cqring_offsets cq_off; 473 }; 474 475 /* 476 * io_uring_params->features flags 477 */ 478 #define IORING_FEAT_SINGLE_MMAP (1U << 0) 479 #define IORING_FEAT_NODROP (1U << 1) 480 #define IORING_FEAT_SUBMIT_STABLE (1U << 2) 481 #define IORING_FEAT_RW_CUR_POS (1U << 3) 482 #define IORING_FEAT_CUR_PERSONALITY (1U << 4) 483 #define IORING_FEAT_FAST_POLL (1U << 5) 484 #define IORING_FEAT_POLL_32BITS (1U << 6) 485 #define IORING_FEAT_SQPOLL_NONFIXED (1U << 7) 486 #define IORING_FEAT_EXT_ARG (1U << 8) 487 #define IORING_FEAT_NATIVE_WORKERS (1U << 9) 488 #define IORING_FEAT_RSRC_TAGS (1U << 10) 489 #define IORING_FEAT_CQE_SKIP (1U << 11) 490 #define IORING_FEAT_LINKED_FILE (1U << 12) 491 #define IORING_FEAT_REG_REG_RING (1U << 13) 492 493 /* 494 * io_uring_register(2) opcodes and arguments 495 */ 496 enum { 497 IORING_REGISTER_BUFFERS = 0, 498 IORING_UNREGISTER_BUFFERS = 1, 499 IORING_REGISTER_FILES = 2, 500 IORING_UNREGISTER_FILES = 3, 501 IORING_REGISTER_EVENTFD = 4, 502 IORING_UNREGISTER_EVENTFD = 5, 503 IORING_REGISTER_FILES_UPDATE = 6, 504 IORING_REGISTER_EVENTFD_ASYNC = 7, 505 IORING_REGISTER_PROBE = 8, 506 IORING_REGISTER_PERSONALITY = 9, 507 IORING_UNREGISTER_PERSONALITY = 10, 508 IORING_REGISTER_RESTRICTIONS = 11, 509 IORING_REGISTER_ENABLE_RINGS = 12, 510 511 /* extended with tagging */ 512 IORING_REGISTER_FILES2 = 13, 513 IORING_REGISTER_FILES_UPDATE2 = 14, 514 IORING_REGISTER_BUFFERS2 = 15, 515 IORING_REGISTER_BUFFERS_UPDATE = 16, 516 517 /* set/clear io-wq thread affinities */ 518 IORING_REGISTER_IOWQ_AFF = 17, 519 IORING_UNREGISTER_IOWQ_AFF = 18, 520 521 /* set/get max number of io-wq workers */ 522 IORING_REGISTER_IOWQ_MAX_WORKERS = 19, 523 524 /* register/unregister io_uring fd with the ring */ 525 IORING_REGISTER_RING_FDS = 20, 526 IORING_UNREGISTER_RING_FDS = 21, 527 528 /* register ring based provide buffer group */ 529 IORING_REGISTER_PBUF_RING = 22, 530 IORING_UNREGISTER_PBUF_RING = 23, 531 532 /* sync cancelation API */ 533 IORING_REGISTER_SYNC_CANCEL = 24, 534 535 /* register a range of fixed file slots for automatic slot allocation */ 536 IORING_REGISTER_FILE_ALLOC_RANGE = 25, 537 538 /* this goes last */ 539 IORING_REGISTER_LAST, 540 541 /* flag added to the opcode to use a registered ring fd */ 542 IORING_REGISTER_USE_REGISTERED_RING = 1U << 31 543 }; 544 545 /* io-wq worker categories */ 546 enum { 547 IO_WQ_BOUND, 548 IO_WQ_UNBOUND, 549 }; 550 551 /* deprecated, see struct io_uring_rsrc_update */ 552 struct io_uring_files_update { 553 __u32 offset; 554 __u32 resv; 555 __aligned_u64 /* __s32 * */ fds; 556 }; 557 558 /* 559 * Register a fully sparse file space, rather than pass in an array of all 560 * -1 file descriptors. 561 */ 562 #define IORING_RSRC_REGISTER_SPARSE (1U << 0) 563 564 struct io_uring_rsrc_register { 565 __u32 nr; 566 __u32 flags; 567 __u64 resv2; 568 __aligned_u64 data; 569 __aligned_u64 tags; 570 }; 571 572 struct io_uring_rsrc_update { 573 __u32 offset; 574 __u32 resv; 575 __aligned_u64 data; 576 }; 577 578 struct io_uring_rsrc_update2 { 579 __u32 offset; 580 __u32 resv; 581 __aligned_u64 data; 582 __aligned_u64 tags; 583 __u32 nr; 584 __u32 resv2; 585 }; 586 587 /* Skip updating fd indexes set to this value in the fd table */ 588 #define IORING_REGISTER_FILES_SKIP (-2) 589 590 #define IO_URING_OP_SUPPORTED (1U << 0) 591 592 struct io_uring_probe_op { 593 __u8 op; 594 __u8 resv; 595 __u16 flags; /* IO_URING_OP_* flags */ 596 __u32 resv2; 597 }; 598 599 struct io_uring_probe { 600 __u8 last_op; /* last opcode supported */ 601 __u8 ops_len; /* length of ops[] array below */ 602 __u16 resv; 603 __u32 resv2[3]; 604 struct io_uring_probe_op ops[]; 605 }; 606 607 struct io_uring_restriction { 608 __u16 opcode; 609 union { 610 __u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */ 611 __u8 sqe_op; /* IORING_RESTRICTION_SQE_OP */ 612 __u8 sqe_flags; /* IORING_RESTRICTION_SQE_FLAGS_* */ 613 }; 614 __u8 resv; 615 __u32 resv2[3]; 616 }; 617 618 struct io_uring_buf { 619 __u64 addr; 620 __u32 len; 621 __u16 bid; 622 __u16 resv; 623 }; 624 625 struct io_uring_buf_ring { 626 union { 627 /* 628 * To avoid spilling into more pages than we need to, the 629 * ring tail is overlaid with the io_uring_buf->resv field. 630 */ 631 struct { 632 __u64 resv1; 633 __u32 resv2; 634 __u16 resv3; 635 __u16 tail; 636 }; 637 __DECLARE_FLEX_ARRAY(struct io_uring_buf, bufs); 638 }; 639 }; 640 641 /* 642 * Flags for IORING_REGISTER_PBUF_RING. 643 * 644 * IOU_PBUF_RING_MMAP: If set, kernel will allocate the memory for the ring. 645 * The application must not set a ring_addr in struct 646 * io_uring_buf_reg, instead it must subsequently call 647 * mmap(2) with the offset set as: 648 * IORING_OFF_PBUF_RING | (bgid << IORING_OFF_PBUF_SHIFT) 649 * to get a virtual mapping for the ring. 650 */ 651 enum { 652 IOU_PBUF_RING_MMAP = 1, 653 }; 654 655 /* argument for IORING_(UN)REGISTER_PBUF_RING */ 656 struct io_uring_buf_reg { 657 __u64 ring_addr; 658 __u32 ring_entries; 659 __u16 bgid; 660 __u16 flags; 661 __u64 resv[3]; 662 }; 663 664 /* 665 * io_uring_restriction->opcode values 666 */ 667 enum { 668 /* Allow an io_uring_register(2) opcode */ 669 IORING_RESTRICTION_REGISTER_OP = 0, 670 671 /* Allow an sqe opcode */ 672 IORING_RESTRICTION_SQE_OP = 1, 673 674 /* Allow sqe flags */ 675 IORING_RESTRICTION_SQE_FLAGS_ALLOWED = 2, 676 677 /* Require sqe flags (these flags must be set on each submission) */ 678 IORING_RESTRICTION_SQE_FLAGS_REQUIRED = 3, 679 680 IORING_RESTRICTION_LAST 681 }; 682 683 struct io_uring_getevents_arg { 684 __u64 sigmask; 685 __u32 sigmask_sz; 686 __u32 pad; 687 __u64 ts; 688 }; 689 690 /* 691 * Argument for IORING_REGISTER_SYNC_CANCEL 692 */ 693 struct io_uring_sync_cancel_reg { 694 __u64 addr; 695 __s32 fd; 696 __u32 flags; 697 struct __kernel_timespec timeout; 698 __u64 pad[4]; 699 }; 700 701 /* 702 * Argument for IORING_REGISTER_FILE_ALLOC_RANGE 703 * The range is specified as [off, off + len) 704 */ 705 struct io_uring_file_index_range { 706 __u32 off; 707 __u32 len; 708 __u64 resv; 709 }; 710 711 struct io_uring_recvmsg_out { 712 __u32 namelen; 713 __u32 controllen; 714 __u32 payloadlen; 715 __u32 flags; 716 }; 717 718 #ifdef __cplusplus 719 } 720 #endif 721 722 #endif 723