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e27f928e JA |
1 | #ifndef IO_URING_TYPES_H |
2 | #define IO_URING_TYPES_H | |
3 | ||
4 | #include <linux/blkdev.h> | |
5 | #include <linux/task_work.h> | |
d9b57aa3 | 6 | #include <linux/bitmap.h> |
e70cb608 | 7 | #include <linux/llist.h> |
d9b57aa3 | 8 | #include <uapi/linux/io_uring.h> |
e27f928e | 9 | |
ab1c84d8 PB |
10 | struct io_wq_work_node { |
11 | struct io_wq_work_node *next; | |
12 | }; | |
13 | ||
14 | struct io_wq_work_list { | |
15 | struct io_wq_work_node *first; | |
16 | struct io_wq_work_node *last; | |
17 | }; | |
18 | ||
19 | struct io_wq_work { | |
20 | struct io_wq_work_node list; | |
21 | unsigned flags; | |
22 | /* place it here instead of io_kiocb as it fills padding and saves 4B */ | |
23 | int cancel_seq; | |
24 | }; | |
25 | ||
26 | struct io_fixed_file { | |
27 | /* file * with additional FFS_* flags */ | |
28 | unsigned long file_ptr; | |
29 | }; | |
30 | ||
31 | struct io_file_table { | |
32 | struct io_fixed_file *files; | |
33 | unsigned long *bitmap; | |
34 | unsigned int alloc_hint; | |
35 | }; | |
e27f928e | 36 | |
e6f89be6 PB |
37 | struct io_hash_bucket { |
38 | spinlock_t lock; | |
39 | struct hlist_head list; | |
40 | } ____cacheline_aligned_in_smp; | |
41 | ||
42 | struct io_hash_table { | |
43 | struct io_hash_bucket *hbs; | |
44 | unsigned hash_bits; | |
45 | }; | |
46 | ||
e70cb608 PB |
47 | /* |
48 | * Arbitrary limit, can be raised if need be | |
49 | */ | |
50 | #define IO_RINGFD_REG_MAX 16 | |
51 | ||
52 | struct io_uring_task { | |
53 | /* submission side */ | |
54 | int cached_refs; | |
55 | const struct io_ring_ctx *last; | |
56 | struct io_wq *io_wq; | |
57 | struct file *registered_rings[IO_RINGFD_REG_MAX]; | |
58 | ||
59 | struct xarray xa; | |
60 | struct wait_queue_head wait; | |
8d664282 | 61 | atomic_t in_cancel; |
e70cb608 PB |
62 | atomic_t inflight_tracked; |
63 | struct percpu_counter inflight; | |
64 | ||
65 | struct { /* task_work */ | |
66 | struct llist_head task_list; | |
67 | struct callback_head task_work; | |
68 | } ____cacheline_aligned_in_smp; | |
69 | }; | |
70 | ||
e27f928e JA |
71 | struct io_uring { |
72 | u32 head ____cacheline_aligned_in_smp; | |
73 | u32 tail ____cacheline_aligned_in_smp; | |
74 | }; | |
75 | ||
76 | /* | |
77 | * This data is shared with the application through the mmap at offsets | |
78 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
79 | * | |
80 | * The offsets to the member fields are published through struct | |
81 | * io_sqring_offsets when calling io_uring_setup. | |
82 | */ | |
83 | struct io_rings { | |
84 | /* | |
85 | * Head and tail offsets into the ring; the offsets need to be | |
86 | * masked to get valid indices. | |
87 | * | |
88 | * The kernel controls head of the sq ring and the tail of the cq ring, | |
89 | * and the application controls tail of the sq ring and the head of the | |
90 | * cq ring. | |
91 | */ | |
92 | struct io_uring sq, cq; | |
93 | /* | |
94 | * Bitmasks to apply to head and tail offsets (constant, equals | |
95 | * ring_entries - 1) | |
96 | */ | |
97 | u32 sq_ring_mask, cq_ring_mask; | |
98 | /* Ring sizes (constant, power of 2) */ | |
99 | u32 sq_ring_entries, cq_ring_entries; | |
100 | /* | |
101 | * Number of invalid entries dropped by the kernel due to | |
102 | * invalid index stored in array | |
103 | * | |
104 | * Written by the kernel, shouldn't be modified by the | |
105 | * application (i.e. get number of "new events" by comparing to | |
106 | * cached value). | |
107 | * | |
108 | * After a new SQ head value was read by the application this | |
109 | * counter includes all submissions that were dropped reaching | |
110 | * the new SQ head (and possibly more). | |
111 | */ | |
112 | u32 sq_dropped; | |
113 | /* | |
114 | * Runtime SQ flags | |
115 | * | |
116 | * Written by the kernel, shouldn't be modified by the | |
117 | * application. | |
118 | * | |
119 | * The application needs a full memory barrier before checking | |
120 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
121 | */ | |
122 | atomic_t sq_flags; | |
123 | /* | |
124 | * Runtime CQ flags | |
125 | * | |
126 | * Written by the application, shouldn't be modified by the | |
127 | * kernel. | |
128 | */ | |
129 | u32 cq_flags; | |
130 | /* | |
131 | * Number of completion events lost because the queue was full; | |
132 | * this should be avoided by the application by making sure | |
133 | * there are not more requests pending than there is space in | |
134 | * the completion queue. | |
135 | * | |
136 | * Written by the kernel, shouldn't be modified by the | |
137 | * application (i.e. get number of "new events" by comparing to | |
138 | * cached value). | |
139 | * | |
140 | * As completion events come in out of order this counter is not | |
141 | * ordered with any other data. | |
142 | */ | |
143 | u32 cq_overflow; | |
144 | /* | |
145 | * Ring buffer of completion events. | |
146 | * | |
147 | * The kernel writes completion events fresh every time they are | |
148 | * produced, so the application is allowed to modify pending | |
149 | * entries. | |
150 | */ | |
151 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; | |
152 | }; | |
153 | ||
154 | struct io_restriction { | |
155 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
156 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
157 | u8 sqe_flags_allowed; | |
158 | u8 sqe_flags_required; | |
159 | bool registered; | |
160 | }; | |
161 | ||
162 | struct io_submit_link { | |
163 | struct io_kiocb *head; | |
164 | struct io_kiocb *last; | |
165 | }; | |
166 | ||
167 | struct io_submit_state { | |
168 | /* inline/task_work completion list, under ->uring_lock */ | |
169 | struct io_wq_work_node free_list; | |
170 | /* batch completion logic */ | |
171 | struct io_wq_work_list compl_reqs; | |
172 | struct io_submit_link link; | |
173 | ||
174 | bool plug_started; | |
175 | bool need_plug; | |
e27f928e | 176 | unsigned short submit_nr; |
931147dd | 177 | unsigned int cqes_count; |
e27f928e | 178 | struct blk_plug plug; |
931147dd | 179 | struct io_uring_cqe cqes[16]; |
e27f928e JA |
180 | }; |
181 | ||
182 | struct io_ev_fd { | |
183 | struct eventfd_ctx *cq_ev_fd; | |
184 | unsigned int eventfd_async: 1; | |
185 | struct rcu_head rcu; | |
21a091b9 DY |
186 | atomic_t refs; |
187 | atomic_t ops; | |
e27f928e JA |
188 | }; |
189 | ||
9b797a37 | 190 | struct io_alloc_cache { |
efba1a9e | 191 | struct io_wq_work_node list; |
9731bc98 | 192 | unsigned int nr_cached; |
e1fe7ee8 | 193 | size_t elem_size; |
9b797a37 JA |
194 | }; |
195 | ||
e27f928e JA |
196 | struct io_ring_ctx { |
197 | /* const or read-mostly hot data */ | |
198 | struct { | |
e27f928e | 199 | unsigned int flags; |
e27f928e JA |
200 | unsigned int drain_next: 1; |
201 | unsigned int restricted: 1; | |
202 | unsigned int off_timeout_used: 1; | |
203 | unsigned int drain_active: 1; | |
e27f928e | 204 | unsigned int has_evfd: 1; |
e6aeb272 PB |
205 | /* all CQEs should be posted only by the submitter task */ |
206 | unsigned int task_complete: 1; | |
632ffe09 | 207 | unsigned int syscall_iopoll: 1; |
bca39f39 | 208 | unsigned int poll_activated: 1; |
632ffe09 PB |
209 | unsigned int drain_disabled: 1; |
210 | unsigned int compat: 1; | |
dde40322 PB |
211 | |
212 | enum task_work_notify_mode notify_method; | |
213 | struct io_rings *rings; | |
214 | struct task_struct *submitter_task; | |
215 | struct percpu_ref refs; | |
e27f928e JA |
216 | } ____cacheline_aligned_in_smp; |
217 | ||
218 | /* submission data */ | |
219 | struct { | |
220 | struct mutex uring_lock; | |
221 | ||
222 | /* | |
223 | * Ring buffer of indices into array of io_uring_sqe, which is | |
224 | * mmapped by the application using the IORING_OFF_SQES offset. | |
225 | * | |
226 | * This indirection could e.g. be used to assign fixed | |
227 | * io_uring_sqe entries to operations and only submit them to | |
228 | * the queue when needed. | |
229 | * | |
230 | * The kernel modifies neither the indices array nor the entries | |
231 | * array. | |
232 | */ | |
233 | u32 *sq_array; | |
234 | struct io_uring_sqe *sq_sqes; | |
235 | unsigned cached_sq_head; | |
236 | unsigned sq_entries; | |
e27f928e JA |
237 | |
238 | /* | |
239 | * Fixed resources fast path, should be accessed only under | |
240 | * uring_lock, and updated through io_uring_register(2) | |
241 | */ | |
242 | struct io_rsrc_node *rsrc_node; | |
e27f928e JA |
243 | atomic_t cancel_seq; |
244 | struct io_file_table file_table; | |
245 | unsigned nr_user_files; | |
246 | unsigned nr_user_bufs; | |
247 | struct io_mapped_ubuf **user_bufs; | |
248 | ||
249 | struct io_submit_state submit_state; | |
250 | ||
251 | struct io_buffer_list *io_bl; | |
252 | struct xarray io_bl_xa; | |
253 | struct list_head io_buffers_cache; | |
254 | ||
9ca9fb24 | 255 | struct io_hash_table cancel_table_locked; |
e27f928e | 256 | struct list_head cq_overflow_list; |
9b797a37 | 257 | struct io_alloc_cache apoll_cache; |
43e0bbbd | 258 | struct io_alloc_cache netmsg_cache; |
e27f928e JA |
259 | } ____cacheline_aligned_in_smp; |
260 | ||
261 | /* IRQ completion list, under ->completion_lock */ | |
262 | struct io_wq_work_list locked_free_list; | |
263 | unsigned int locked_free_nr; | |
264 | ||
265 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ | |
266 | struct io_sq_data *sq_data; /* if using sq thread polling */ | |
267 | ||
268 | struct wait_queue_head sqo_sq_wait; | |
269 | struct list_head sqd_list; | |
270 | ||
271 | unsigned long check_cq; | |
272 | ||
6e73dffb PB |
273 | unsigned int file_alloc_start; |
274 | unsigned int file_alloc_end; | |
275 | ||
43e0bbbd JA |
276 | struct xarray personalities; |
277 | u32 pers_next; | |
278 | ||
e27f928e JA |
279 | struct { |
280 | /* | |
281 | * We cache a range of free CQEs we can use, once exhausted it | |
282 | * should go through a slower range setup, see __io_get_cqe() | |
283 | */ | |
284 | struct io_uring_cqe *cqe_cached; | |
285 | struct io_uring_cqe *cqe_sentinel; | |
286 | ||
287 | unsigned cached_cq_tail; | |
288 | unsigned cq_entries; | |
289 | struct io_ev_fd __rcu *io_ev_fd; | |
290 | struct wait_queue_head cq_wait; | |
291 | unsigned cq_extra; | |
e27f928e JA |
292 | } ____cacheline_aligned_in_smp; |
293 | ||
294 | struct { | |
295 | spinlock_t completion_lock; | |
296 | ||
59b745bb | 297 | bool poll_multi_queue; |
d80c0f00 | 298 | bool cq_waiting; |
59b745bb | 299 | |
e27f928e JA |
300 | /* |
301 | * ->iopoll_list is protected by the ctx->uring_lock for | |
302 | * io_uring instances that don't use IORING_SETUP_SQPOLL. | |
303 | * For SQPOLL, only the single threaded io_sq_thread() will | |
304 | * manipulate the list, hence no extra locking is needed there. | |
305 | */ | |
306 | struct io_wq_work_list iopoll_list; | |
e6f89be6 | 307 | struct io_hash_table cancel_table; |
e27f928e | 308 | |
c0e0d6ba DY |
309 | struct llist_head work_llist; |
310 | ||
e27f928e JA |
311 | struct list_head io_buffers_comp; |
312 | } ____cacheline_aligned_in_smp; | |
313 | ||
aff5b2df PB |
314 | /* timeouts */ |
315 | struct { | |
316 | spinlock_t timeout_lock; | |
317 | atomic_t cq_timeouts; | |
318 | struct list_head timeout_list; | |
319 | struct list_head ltimeout_list; | |
320 | unsigned cq_last_tm_flush; | |
321 | } ____cacheline_aligned_in_smp; | |
322 | ||
e27f928e | 323 | /* Keep this last, we don't need it for the fast path */ |
7b235dd8 | 324 | struct wait_queue_head poll_wq; |
22eb2a3f PB |
325 | struct io_restriction restrictions; |
326 | ||
327 | /* slow path rsrc auxilary data, used by update/register */ | |
328 | struct io_rsrc_node *rsrc_backup_node; | |
329 | struct io_mapped_ubuf *dummy_ubuf; | |
330 | struct io_rsrc_data *file_data; | |
331 | struct io_rsrc_data *buf_data; | |
332 | ||
0a4813b1 | 333 | /* protected by ->uring_lock */ |
22eb2a3f | 334 | struct list_head rsrc_ref_list; |
22eb2a3f PB |
335 | |
336 | struct list_head io_buffers_pages; | |
337 | ||
338 | #if defined(CONFIG_UNIX) | |
339 | struct socket *ring_sock; | |
340 | #endif | |
341 | /* hashed buffered write serialization */ | |
342 | struct io_wq_hash *hash_map; | |
343 | ||
344 | /* Only used for accounting purposes */ | |
345 | struct user_struct *user; | |
346 | struct mm_struct *mm_account; | |
347 | ||
348 | /* ctx exit and cancelation */ | |
349 | struct llist_head fallback_llist; | |
350 | struct delayed_work fallback_work; | |
351 | struct work_struct exit_work; | |
352 | struct list_head tctx_list; | |
353 | struct completion ref_comp; | |
354 | ||
355 | /* io-wq management, e.g. thread count */ | |
356 | u32 iowq_limits[2]; | |
357 | bool iowq_limits_set; | |
358 | ||
bca39f39 | 359 | struct callback_head poll_wq_task_work; |
22eb2a3f PB |
360 | struct list_head defer_list; |
361 | unsigned sq_thread_idle; | |
305bef98 PB |
362 | /* protected by ->completion_lock */ |
363 | unsigned evfd_last_cq_tail; | |
e27f928e JA |
364 | }; |
365 | ||
a282967c PB |
366 | struct io_tw_state { |
367 | /* ->uring_lock is taken, callbacks can use io_tw_lock to lock it */ | |
368 | bool locked; | |
369 | }; | |
370 | ||
e27f928e JA |
371 | enum { |
372 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
373 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
374 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
375 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
376 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
377 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, | |
378 | REQ_F_CQE_SKIP_BIT = IOSQE_CQE_SKIP_SUCCESS_BIT, | |
379 | ||
380 | /* first byte is taken by user flags, shift it to not overlap */ | |
381 | REQ_F_FAIL_BIT = 8, | |
382 | REQ_F_INFLIGHT_BIT, | |
383 | REQ_F_CUR_POS_BIT, | |
384 | REQ_F_NOWAIT_BIT, | |
385 | REQ_F_LINK_TIMEOUT_BIT, | |
386 | REQ_F_NEED_CLEANUP_BIT, | |
387 | REQ_F_POLLED_BIT, | |
388 | REQ_F_BUFFER_SELECTED_BIT, | |
389 | REQ_F_BUFFER_RING_BIT, | |
e27f928e JA |
390 | REQ_F_REISSUE_BIT, |
391 | REQ_F_CREDS_BIT, | |
392 | REQ_F_REFCOUNT_BIT, | |
393 | REQ_F_ARM_LTIMEOUT_BIT, | |
394 | REQ_F_ASYNC_DATA_BIT, | |
395 | REQ_F_SKIP_LINK_CQES_BIT, | |
396 | REQ_F_SINGLE_POLL_BIT, | |
397 | REQ_F_DOUBLE_POLL_BIT, | |
398 | REQ_F_PARTIAL_IO_BIT, | |
399 | REQ_F_CQE32_INIT_BIT, | |
400 | REQ_F_APOLL_MULTISHOT_BIT, | |
401 | REQ_F_CLEAR_POLLIN_BIT, | |
9ca9fb24 | 402 | REQ_F_HASH_LOCKED_BIT, |
e27f928e JA |
403 | /* keep async read/write and isreg together and in order */ |
404 | REQ_F_SUPPORT_NOWAIT_BIT, | |
405 | REQ_F_ISREG_BIT, | |
406 | ||
407 | /* not a real bit, just to check we're not overflowing the space */ | |
408 | __REQ_F_LAST_BIT, | |
409 | }; | |
410 | ||
411 | enum { | |
412 | /* ctx owns file */ | |
413 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
414 | /* drain existing IO first */ | |
415 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
416 | /* linked sqes */ | |
417 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
418 | /* doesn't sever on completion < 0 */ | |
419 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
420 | /* IOSQE_ASYNC */ | |
421 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
422 | /* IOSQE_BUFFER_SELECT */ | |
423 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
424 | /* IOSQE_CQE_SKIP_SUCCESS */ | |
425 | REQ_F_CQE_SKIP = BIT(REQ_F_CQE_SKIP_BIT), | |
426 | ||
427 | /* fail rest of links */ | |
428 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), | |
429 | /* on inflight list, should be cancelled and waited on exit reliably */ | |
430 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
431 | /* read/write uses file position */ | |
432 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
433 | /* must not punt to workers */ | |
434 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
435 | /* has or had linked timeout */ | |
436 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), | |
437 | /* needs cleanup */ | |
438 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
439 | /* already went through poll handler */ | |
440 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
441 | /* buffer already selected */ | |
442 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
443 | /* buffer selected from ring, needs commit */ | |
444 | REQ_F_BUFFER_RING = BIT(REQ_F_BUFFER_RING_BIT), | |
e27f928e JA |
445 | /* caller should reissue async */ |
446 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
447 | /* supports async reads/writes */ | |
448 | REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT), | |
449 | /* regular file */ | |
450 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
451 | /* has creds assigned */ | |
452 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
453 | /* skip refcounting if not set */ | |
454 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
455 | /* there is a linked timeout that has to be armed */ | |
456 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
457 | /* ->async_data allocated */ | |
458 | REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT), | |
459 | /* don't post CQEs while failing linked requests */ | |
460 | REQ_F_SKIP_LINK_CQES = BIT(REQ_F_SKIP_LINK_CQES_BIT), | |
461 | /* single poll may be active */ | |
462 | REQ_F_SINGLE_POLL = BIT(REQ_F_SINGLE_POLL_BIT), | |
463 | /* double poll may active */ | |
464 | REQ_F_DOUBLE_POLL = BIT(REQ_F_DOUBLE_POLL_BIT), | |
465 | /* request has already done partial IO */ | |
466 | REQ_F_PARTIAL_IO = BIT(REQ_F_PARTIAL_IO_BIT), | |
467 | /* fast poll multishot mode */ | |
468 | REQ_F_APOLL_MULTISHOT = BIT(REQ_F_APOLL_MULTISHOT_BIT), | |
469 | /* ->extra1 and ->extra2 are initialised */ | |
470 | REQ_F_CQE32_INIT = BIT(REQ_F_CQE32_INIT_BIT), | |
471 | /* recvmsg special flag, clear EPOLLIN */ | |
472 | REQ_F_CLEAR_POLLIN = BIT(REQ_F_CLEAR_POLLIN_BIT), | |
9ca9fb24 PB |
473 | /* hashed into ->cancel_hash_locked, protected by ->uring_lock */ |
474 | REQ_F_HASH_LOCKED = BIT(REQ_F_HASH_LOCKED_BIT), | |
e27f928e JA |
475 | }; |
476 | ||
a282967c | 477 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, struct io_tw_state *ts); |
e27f928e JA |
478 | |
479 | struct io_task_work { | |
3218e5d3 | 480 | struct llist_node node; |
e27f928e JA |
481 | io_req_tw_func_t func; |
482 | }; | |
483 | ||
484 | struct io_cqe { | |
485 | __u64 user_data; | |
486 | __s32 res; | |
487 | /* fd initially, then cflags for completion */ | |
488 | union { | |
489 | __u32 flags; | |
490 | int fd; | |
491 | }; | |
492 | }; | |
493 | ||
494 | /* | |
495 | * Each request type overlays its private data structure on top of this one. | |
496 | * They must not exceed this one in size. | |
497 | */ | |
498 | struct io_cmd_data { | |
499 | struct file *file; | |
500 | /* each command gets 56 bytes of data */ | |
501 | __u8 data[56]; | |
502 | }; | |
503 | ||
f2ccb5ae SM |
504 | static inline void io_kiocb_cmd_sz_check(size_t cmd_sz) |
505 | { | |
506 | BUILD_BUG_ON(cmd_sz > sizeof(struct io_cmd_data)); | |
507 | } | |
508 | #define io_kiocb_to_cmd(req, cmd_type) ( \ | |
509 | io_kiocb_cmd_sz_check(sizeof(cmd_type)) , \ | |
510 | ((cmd_type *)&(req)->cmd) \ | |
511 | ) | |
e27f928e JA |
512 | #define cmd_to_io_kiocb(ptr) ((struct io_kiocb *) ptr) |
513 | ||
514 | struct io_kiocb { | |
515 | union { | |
516 | /* | |
517 | * NOTE! Each of the io_kiocb union members has the file pointer | |
518 | * as the first entry in their struct definition. So you can | |
519 | * access the file pointer through any of the sub-structs, | |
520 | * or directly as just 'file' in this struct. | |
521 | */ | |
522 | struct file *file; | |
523 | struct io_cmd_data cmd; | |
524 | }; | |
525 | ||
526 | u8 opcode; | |
527 | /* polled IO has completed */ | |
528 | u8 iopoll_completed; | |
529 | /* | |
530 | * Can be either a fixed buffer index, or used with provided buffers. | |
531 | * For the latter, before issue it points to the buffer group ID, | |
532 | * and after selection it points to the buffer ID itself. | |
533 | */ | |
534 | u16 buf_index; | |
535 | unsigned int flags; | |
536 | ||
537 | struct io_cqe cqe; | |
538 | ||
539 | struct io_ring_ctx *ctx; | |
540 | struct task_struct *task; | |
541 | ||
542 | struct io_rsrc_node *rsrc_node; | |
543 | ||
544 | union { | |
545 | /* store used ubuf, so we can prevent reloading */ | |
546 | struct io_mapped_ubuf *imu; | |
547 | ||
548 | /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ | |
549 | struct io_buffer *kbuf; | |
550 | ||
551 | /* | |
552 | * stores buffer ID for ring provided buffers, valid IFF | |
553 | * REQ_F_BUFFER_RING is set. | |
554 | */ | |
555 | struct io_buffer_list *buf_list; | |
556 | }; | |
557 | ||
558 | union { | |
559 | /* used by request caches, completion batching and iopoll */ | |
560 | struct io_wq_work_node comp_list; | |
561 | /* cache ->apoll->events */ | |
562 | __poll_t apoll_events; | |
563 | }; | |
564 | atomic_t refs; | |
565 | atomic_t poll_refs; | |
566 | struct io_task_work io_task_work; | |
567 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
568 | union { | |
569 | struct hlist_node hash_node; | |
570 | struct { | |
571 | u64 extra1; | |
572 | u64 extra2; | |
573 | }; | |
574 | }; | |
575 | /* internal polling, see IORING_FEAT_FAST_POLL */ | |
576 | struct async_poll *apoll; | |
577 | /* opcode allocated if it needs to store data for async defer */ | |
578 | void *async_data; | |
579 | /* linked requests, IFF REQ_F_HARDLINK or REQ_F_LINK are set */ | |
580 | struct io_kiocb *link; | |
581 | /* custom credentials, valid IFF REQ_F_CREDS is set */ | |
582 | const struct cred *creds; | |
583 | struct io_wq_work work; | |
584 | }; | |
585 | ||
a4ad4f74 JA |
586 | struct io_overflow_cqe { |
587 | struct list_head list; | |
588 | struct io_uring_cqe cqe; | |
589 | }; | |
590 | ||
e27f928e | 591 | #endif |