Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_aio.c
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1 /*- 2 * Copyright (c) 1997 John S. Dyson. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. John S. Dyson's name may not be used to endorse or promote products 10 * derived from this software without specific prior written permission. 11 * 12 * DISCLAIMER: This code isn't warranted to do anything useful. Anything 13 * bad that happens because of using this software isn't the responsibility 14 * of the author. This software is distributed AS-IS. 15 */ 16 17 /* 18 * This file contains support for the POSIX 1003.1B AIO/LIO facility. 19 */ 20 21 #include <sys/cdefs.h> 22 __FBSDID("$FreeBSD$"); 23 24 #include <sys/param.h> 25 #include <sys/systm.h> 26 #include <sys/malloc.h> 27 #include <sys/bio.h> 28 #include <sys/buf.h> 29 #include <sys/eventhandler.h> 30 #include <sys/sysproto.h> 31 #include <sys/filedesc.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/kthread.h> 35 #include <sys/fcntl.h> 36 #include <sys/file.h> 37 #include <sys/limits.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/unistd.h> 41 #include <sys/proc.h> 42 #include <sys/resourcevar.h> 43 #include <sys/signalvar.h> 44 #include <sys/protosw.h> 45 #include <sys/socketvar.h> 46 #include <sys/syscall.h> 47 #include <sys/sysent.h> 48 #include <sys/sysctl.h> 49 #include <sys/sx.h> 50 #include <sys/vnode.h> 51 #include <sys/conf.h> 52 #include <sys/event.h> 53 54 #include <posix4/posix4.h> 55 #include <vm/vm.h> 56 #include <vm/vm_extern.h> 57 #include <vm/pmap.h> 58 #include <vm/vm_map.h> 59 #include <vm/uma.h> 60 #include <sys/aio.h> 61 62 #include "opt_vfs_aio.h" 63 64 65 /* 66 * Counter for allocating reference ids to new jobs. Wrapped to 1 on 67 * overflow. 68 */ 69 static long jobrefid; 70 71 #define JOBST_NULL 0x0 72 #define JOBST_JOBQGLOBAL 0x2 73 #define JOBST_JOBRUNNING 0x3 74 #define JOBST_JOBFINISHED 0x4 75 #define JOBST_JOBQBUF 0x5 76 #define JOBST_JOBBFINISHED 0x6 77 78 #ifndef MAX_AIO_PER_PROC 79 #define MAX_AIO_PER_PROC 32 80 #endif 81 82 #ifndef MAX_AIO_QUEUE_PER_PROC 83 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */ 84 #endif 85 86 #ifndef MAX_AIO_PROCS 87 #define MAX_AIO_PROCS 32 88 #endif 89 90 #ifndef MAX_AIO_QUEUE 91 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */ 92 #endif 93 94 #ifndef TARGET_AIO_PROCS 95 #define TARGET_AIO_PROCS 4 96 #endif 97 98 #ifndef MAX_BUF_AIO 99 #define MAX_BUF_AIO 16 100 #endif 101 102 #ifndef AIOD_TIMEOUT_DEFAULT 103 #define AIOD_TIMEOUT_DEFAULT (10 * hz) 104 #endif 105 106 #ifndef AIOD_LIFETIME_DEFAULT 107 #define AIOD_LIFETIME_DEFAULT (30 * hz) 108 #endif 109 110 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management"); 111 112 static int max_aio_procs = MAX_AIO_PROCS; 113 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, 114 CTLFLAG_RW, &max_aio_procs, 0, 115 "Maximum number of kernel threads to use for handling async IO "); 116 117 static int num_aio_procs = 0; 118 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, 119 CTLFLAG_RD, &num_aio_procs, 0, 120 "Number of presently active kernel threads for async IO"); 121 122 /* 123 * The code will adjust the actual number of AIO processes towards this 124 * number when it gets a chance. 125 */ 126 static int target_aio_procs = TARGET_AIO_PROCS; 127 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 128 0, "Preferred number of ready kernel threads for async IO"); 129 130 static int max_queue_count = MAX_AIO_QUEUE; 131 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, 132 "Maximum number of aio requests to queue, globally"); 133 134 static int num_queue_count = 0; 135 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, 136 "Number of queued aio requests"); 137 138 static int num_buf_aio = 0; 139 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, 140 "Number of aio requests presently handled by the buf subsystem"); 141 142 /* Number of async I/O thread in the process of being started */ 143 /* XXX This should be local to _aio_aqueue() */ 144 static int num_aio_resv_start = 0; 145 146 static int aiod_timeout; 147 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0, 148 "Timeout value for synchronous aio operations"); 149 150 static int aiod_lifetime; 151 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, 152 "Maximum lifetime for idle aiod"); 153 154 static int unloadable = 0; 155 SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0, 156 "Allow unload of aio (not recommended)"); 157 158 159 static int max_aio_per_proc = MAX_AIO_PER_PROC; 160 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 161 0, "Maximum active aio requests per process (stored in the process)"); 162 163 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 164 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, 165 &max_aio_queue_per_proc, 0, 166 "Maximum queued aio requests per process (stored in the process)"); 167 168 static int max_buf_aio = MAX_BUF_AIO; 169 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, 170 "Maximum buf aio requests per process (stored in the process)"); 171 172 struct aiocblist { 173 TAILQ_ENTRY(aiocblist) list; /* List of jobs */ 174 TAILQ_ENTRY(aiocblist) plist; /* List of jobs for proc */ 175 int jobflags; 176 int jobstate; 177 int inputcharge; 178 int outputcharge; 179 struct buf *bp; /* Buffer pointer */ 180 struct proc *userproc; /* User process */ /* Not td! */ 181 struct ucred *cred; /* Active credential when created */ 182 struct file *fd_file; /* Pointer to file structure */ 183 struct aio_liojob *lio; /* Optional lio job */ 184 struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */ 185 struct knlist klist; /* list of knotes */ 186 struct aiocb uaiocb; /* Kernel I/O control block */ 187 }; 188 189 /* jobflags */ 190 #define AIOCBLIST_RUNDOWN 0x4 191 #define AIOCBLIST_DONE 0x10 192 193 /* 194 * AIO process info 195 */ 196 #define AIOP_FREE 0x1 /* proc on free queue */ 197 198 struct aiothreadlist { 199 int aiothreadflags; /* AIO proc flags */ 200 TAILQ_ENTRY(aiothreadlist) list; /* List of processes */ 201 struct thread *aiothread; /* The AIO thread */ 202 }; 203 204 /* 205 * data-structure for lio signal management 206 */ 207 struct aio_liojob { 208 int lioj_flags; 209 int lioj_buffer_count; 210 int lioj_buffer_finished_count; 211 int lioj_queue_count; 212 int lioj_queue_finished_count; 213 struct sigevent lioj_signal; /* signal on all I/O done */ 214 TAILQ_ENTRY(aio_liojob) lioj_list; 215 }; 216 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ 217 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ 218 219 /* 220 * per process aio data structure 221 */ 222 struct kaioinfo { 223 int kaio_flags; /* per process kaio flags */ 224 int kaio_maxactive_count; /* maximum number of AIOs */ 225 int kaio_active_count; /* number of currently used AIOs */ 226 int kaio_qallowed_count; /* maxiumu size of AIO queue */ 227 int kaio_queue_count; /* size of AIO queue */ 228 int kaio_ballowed_count; /* maximum number of buffers */ 229 int kaio_queue_finished_count; /* number of daemon jobs finished */ 230 int kaio_buffer_count; /* number of physio buffers */ 231 int kaio_buffer_finished_count; /* count of I/O done */ 232 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */ 233 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */ 234 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */ 235 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */ 236 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */ 237 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */ 238 }; 239 240 #define KAIO_RUNDOWN 0x1 /* process is being run down */ 241 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ 242 243 static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* Idle daemons */ 244 static struct mtx aio_freeproc_mtx; 245 246 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */ 247 248 static void aio_init_aioinfo(struct proc *p); 249 static void aio_onceonly(void); 250 static int aio_free_entry(struct aiocblist *aiocbe); 251 static void aio_process(struct aiocblist *aiocbe); 252 static int aio_newproc(void); 253 static int aio_aqueue(struct thread *td, struct aiocb *job, int type); 254 static void aio_physwakeup(struct buf *bp); 255 static void aio_proc_rundown(void *arg, struct proc *p); 256 static int aio_fphysio(struct aiocblist *aiocbe); 257 static int aio_qphysio(struct proc *p, struct aiocblist *iocb); 258 static void aio_daemon(void *uproc); 259 static void aio_swake_cb(struct socket *, struct sockbuf *); 260 static int aio_unload(void); 261 static int filt_aioattach(struct knote *kn); 262 static void filt_aiodetach(struct knote *kn); 263 static int filt_aio(struct knote *kn, long hint); 264 265 /* 266 * Zones for: 267 * kaio Per process async io info 268 * aiop async io thread data 269 * aiocb async io jobs 270 * aiol list io job pointer - internal to aio_suspend XXX 271 * aiolio list io jobs 272 */ 273 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone; 274 275 /* kqueue filters for aio */ 276 static struct filterops aio_filtops = 277 { 0, filt_aioattach, filt_aiodetach, filt_aio }; 278 279 static eventhandler_tag exit_tag, exec_tag; 280 281 /* 282 * Main operations function for use as a kernel module. 283 */ 284 static int 285 aio_modload(struct module *module, int cmd, void *arg) 286 { 287 int error = 0; 288 289 switch (cmd) { 290 case MOD_LOAD: 291 aio_onceonly(); 292 break; 293 case MOD_UNLOAD: 294 error = aio_unload(); 295 break; 296 case MOD_SHUTDOWN: 297 break; 298 default: 299 error = EINVAL; 300 break; 301 } 302 return (error); 303 } 304 305 static moduledata_t aio_mod = { 306 "aio", 307 &aio_modload, 308 NULL 309 }; 310 311 SYSCALL_MODULE_HELPER(aio_return); 312 SYSCALL_MODULE_HELPER(aio_suspend); 313 SYSCALL_MODULE_HELPER(aio_cancel); 314 SYSCALL_MODULE_HELPER(aio_error); 315 SYSCALL_MODULE_HELPER(aio_read); 316 SYSCALL_MODULE_HELPER(aio_write); 317 SYSCALL_MODULE_HELPER(aio_waitcomplete); 318 SYSCALL_MODULE_HELPER(lio_listio); 319 320 DECLARE_MODULE(aio, aio_mod, 321 SI_SUB_VFS, SI_ORDER_ANY); 322 MODULE_VERSION(aio, 1); 323 324 /* 325 * Startup initialization 326 */ 327 static void 328 aio_onceonly(void) 329 { 330 331 /* XXX: should probably just use so->callback */ 332 aio_swake = &aio_swake_cb; 333 exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL, 334 EVENTHANDLER_PRI_ANY); 335 exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown, NULL, 336 EVENTHANDLER_PRI_ANY); 337 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops); 338 TAILQ_INIT(&aio_freeproc); 339 mtx_init(&aio_freeproc_mtx, "aio_freeproc", NULL, MTX_DEF); 340 TAILQ_INIT(&aio_jobs); 341 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL, 342 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 343 aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL, 344 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 345 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL, 346 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 347 aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL, 348 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 349 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aio_liojob), NULL, 350 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 351 aiod_timeout = AIOD_TIMEOUT_DEFAULT; 352 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 353 jobrefid = 1; 354 async_io_version = _POSIX_VERSION; 355 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX); 356 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE); 357 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0); 358 } 359 360 /* 361 * Callback for unload of AIO when used as a module. 362 */ 363 static int 364 aio_unload(void) 365 { 366 int error; 367 368 /* 369 * XXX: no unloads by default, it's too dangerous. 370 * perhaps we could do it if locked out callers and then 371 * did an aio_proc_rundown() on each process. 372 */ 373 if (!unloadable) 374 return (EOPNOTSUPP); 375 376 error = kqueue_del_filteropts(EVFILT_AIO); 377 if (error) 378 return error; 379 380 async_io_version = 0; 381 aio_swake = NULL; 382 EVENTHANDLER_DEREGISTER(process_exit, exit_tag); 383 EVENTHANDLER_DEREGISTER(process_exec, exec_tag); 384 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1); 385 p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1); 386 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1); 387 return (0); 388 } 389 390 /* 391 * Init the per-process aioinfo structure. The aioinfo limits are set 392 * per-process for user limit (resource) management. 393 */ 394 static void 395 aio_init_aioinfo(struct proc *p) 396 { 397 struct kaioinfo *ki; 398 399 ki = uma_zalloc(kaio_zone, M_WAITOK); 400 ki->kaio_flags = 0; 401 ki->kaio_maxactive_count = max_aio_per_proc; 402 ki->kaio_active_count = 0; 403 ki->kaio_qallowed_count = max_aio_queue_per_proc; 404 ki->kaio_queue_count = 0; 405 ki->kaio_ballowed_count = max_buf_aio; 406 ki->kaio_buffer_count = 0; 407 ki->kaio_buffer_finished_count = 0; 408 TAILQ_INIT(&ki->kaio_jobdone); 409 TAILQ_INIT(&ki->kaio_jobqueue); 410 TAILQ_INIT(&ki->kaio_bufdone); 411 TAILQ_INIT(&ki->kaio_bufqueue); 412 TAILQ_INIT(&ki->kaio_liojoblist); 413 TAILQ_INIT(&ki->kaio_sockqueue); 414 PROC_LOCK(p); 415 if (p->p_aioinfo == NULL) { 416 p->p_aioinfo = ki; 417 PROC_UNLOCK(p); 418 } else { 419 PROC_UNLOCK(p); 420 uma_zfree(kaio_zone, ki); 421 } 422 423 while (num_aio_procs < target_aio_procs) 424 aio_newproc(); 425 } 426 427 /* 428 * Free a job entry. Wait for completion if it is currently active, but don't 429 * delay forever. If we delay, we return a flag that says that we have to 430 * restart the queue scan. 431 */ 432 static int 433 aio_free_entry(struct aiocblist *aiocbe) 434 { 435 struct kaioinfo *ki; 436 struct aio_liojob *lj; 437 struct proc *p; 438 int error; 439 int s; 440 441 if (aiocbe->jobstate == JOBST_NULL) 442 panic("aio_free_entry: freeing already free job"); 443 444 p = aiocbe->userproc; 445 ki = p->p_aioinfo; 446 lj = aiocbe->lio; 447 if (ki == NULL) 448 panic("aio_free_entry: missing p->p_aioinfo"); 449 450 while (aiocbe->jobstate == JOBST_JOBRUNNING) { 451 aiocbe->jobflags |= AIOCBLIST_RUNDOWN; 452 tsleep(aiocbe, PRIBIO, "jobwai", 0); 453 } 454 if (aiocbe->bp == NULL) { 455 if (ki->kaio_queue_count <= 0) 456 panic("aio_free_entry: process queue size <= 0"); 457 if (num_queue_count <= 0) 458 panic("aio_free_entry: system wide queue size <= 0"); 459 460 if (lj) { 461 lj->lioj_queue_count--; 462 if (aiocbe->jobflags & AIOCBLIST_DONE) 463 lj->lioj_queue_finished_count--; 464 } 465 ki->kaio_queue_count--; 466 if (aiocbe->jobflags & AIOCBLIST_DONE) 467 ki->kaio_queue_finished_count--; 468 num_queue_count--; 469 } else { 470 if (lj) { 471 lj->lioj_buffer_count--; 472 if (aiocbe->jobflags & AIOCBLIST_DONE) 473 lj->lioj_buffer_finished_count--; 474 } 475 if (aiocbe->jobflags & AIOCBLIST_DONE) 476 ki->kaio_buffer_finished_count--; 477 ki->kaio_buffer_count--; 478 num_buf_aio--; 479 } 480 481 /* aiocbe is going away, we need to destroy any knotes */ 482 /* XXXKSE Note the thread here is used to eventually find the 483 * owning process again, but it is also used to do a fo_close 484 * and that requires the thread. (but does it require the 485 * OWNING thread? (or maybe the running thread?) 486 * There is a semantic problem here... 487 */ 488 knlist_delete(&aiocbe->klist, FIRST_THREAD_IN_PROC(p), 0); /* XXXKSE */ 489 490 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN) 491 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) { 492 ki->kaio_flags &= ~KAIO_WAKEUP; 493 wakeup(p); 494 } 495 496 if (aiocbe->jobstate == JOBST_JOBQBUF) { 497 if ((error = aio_fphysio(aiocbe)) != 0) 498 return (error); 499 if (aiocbe->jobstate != JOBST_JOBBFINISHED) 500 panic("aio_free_entry: invalid physio finish-up state"); 501 s = splbio(); 502 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 503 splx(s); 504 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) { 505 s = splnet(); 506 mtx_lock(&aio_freeproc_mtx); 507 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 508 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 509 mtx_unlock(&aio_freeproc_mtx); 510 splx(s); 511 } else if (aiocbe->jobstate == JOBST_JOBFINISHED) 512 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist); 513 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) { 514 s = splbio(); 515 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 516 splx(s); 517 if (aiocbe->bp) { 518 vunmapbuf(aiocbe->bp); 519 relpbuf(aiocbe->bp, NULL); 520 aiocbe->bp = NULL; 521 } 522 } 523 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) { 524 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 525 uma_zfree(aiolio_zone, lj); 526 } 527 aiocbe->jobstate = JOBST_NULL; 528 fdrop(aiocbe->fd_file, curthread); 529 crfree(aiocbe->cred); 530 uma_zfree(aiocb_zone, aiocbe); 531 return (0); 532 } 533 534 /* 535 * Rundown the jobs for a given process. 536 */ 537 static void 538 aio_proc_rundown(void *arg, struct proc *p) 539 { 540 int s; 541 struct kaioinfo *ki; 542 struct aio_liojob *lj, *ljn; 543 struct aiocblist *aiocbe, *aiocbn; 544 struct file *fp; 545 struct socket *so; 546 547 ki = p->p_aioinfo; 548 if (ki == NULL) 549 return; 550 551 mtx_lock(&Giant); 552 ki->kaio_flags |= LIOJ_SIGNAL_POSTED; 553 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count > 554 ki->kaio_buffer_finished_count)) { 555 ki->kaio_flags |= KAIO_RUNDOWN; 556 if (tsleep(p, PRIBIO, "kaiowt", aiod_timeout)) 557 break; 558 } 559 560 /* 561 * Move any aio ops that are waiting on socket I/O to the normal job 562 * queues so they are cleaned up with any others. 563 */ 564 s = splnet(); 565 mtx_lock(&aio_freeproc_mtx); 566 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe = 567 aiocbn) { 568 aiocbn = TAILQ_NEXT(aiocbe, plist); 569 fp = aiocbe->fd_file; 570 if (fp != NULL) { 571 so = fp->f_data; 572 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list); 573 if (TAILQ_EMPTY(&so->so_aiojobq)) { 574 SOCKBUF_LOCK(&so->so_snd); 575 so->so_snd.sb_flags &= ~SB_AIO; 576 SOCKBUF_UNLOCK(&so->so_snd); 577 SOCKBUF_LOCK(&so->so_rcv); 578 so->so_rcv.sb_flags &= ~SB_AIO; 579 SOCKBUF_UNLOCK(&so->so_rcv); 580 } 581 } 582 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist); 583 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list); 584 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist); 585 } 586 mtx_unlock(&aio_freeproc_mtx); 587 splx(s); 588 589 restart1: 590 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) { 591 aiocbn = TAILQ_NEXT(aiocbe, plist); 592 if (aio_free_entry(aiocbe)) 593 goto restart1; 594 } 595 596 restart2: 597 mtx_lock(&aio_freeproc_mtx); 598 while ((aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue)) != NULL) { 599 mtx_unlock(&aio_freeproc_mtx); 600 if (aio_free_entry(aiocbe)) 601 goto restart2; 602 mtx_lock(&aio_freeproc_mtx); 603 } 604 mtx_unlock(&aio_freeproc_mtx); 605 606 /* 607 * Note the use of lots of splbio here, trying to avoid splbio for long chains 608 * of I/O. Probably unnecessary. 609 */ 610 restart3: 611 s = splbio(); 612 while (TAILQ_FIRST(&ki->kaio_bufqueue)) { 613 ki->kaio_flags |= KAIO_WAKEUP; 614 tsleep(p, PRIBIO, "aioprn", 0); 615 splx(s); 616 goto restart3; 617 } 618 splx(s); 619 620 restart4: 621 s = splbio(); 622 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) { 623 aiocbn = TAILQ_NEXT(aiocbe, plist); 624 if (aio_free_entry(aiocbe)) { 625 splx(s); 626 goto restart4; 627 } 628 } 629 splx(s); 630 631 /* 632 * If we've slept, jobs might have moved from one queue to another. 633 * Retry rundown if we didn't manage to empty the queues. 634 */ 635 mtx_lock(&aio_freeproc_mtx); 636 if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL || 637 TAILQ_FIRST(&ki->kaio_jobqueue) != NULL || 638 TAILQ_FIRST(&ki->kaio_bufqueue) != NULL || 639 TAILQ_FIRST(&ki->kaio_bufdone) != NULL) { 640 mtx_unlock(&aio_freeproc_mtx); 641 goto restart1; 642 } 643 mtx_unlock(&aio_freeproc_mtx); 644 645 for (lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) { 646 ljn = TAILQ_NEXT(lj, lioj_list); 647 if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 648 0)) { 649 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 650 uma_zfree(aiolio_zone, lj); 651 } else { 652 #ifdef DIAGNOSTIC 653 printf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, " 654 "QF:%d\n", lj->lioj_buffer_count, 655 lj->lioj_buffer_finished_count, 656 lj->lioj_queue_count, 657 lj->lioj_queue_finished_count); 658 #endif 659 } 660 } 661 662 uma_zfree(kaio_zone, ki); 663 p->p_aioinfo = NULL; 664 mtx_unlock(&Giant); 665 } 666 667 /* 668 * Select a job to run (called by an AIO daemon). 669 */ 670 static struct aiocblist * 671 aio_selectjob(struct aiothreadlist *aiop) 672 { 673 int s; 674 struct aiocblist *aiocbe; 675 struct kaioinfo *ki; 676 struct proc *userp; 677 678 s = splnet(); 679 mtx_lock(&aio_freeproc_mtx); 680 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe = 681 TAILQ_NEXT(aiocbe, list)) { 682 userp = aiocbe->userproc; 683 ki = userp->p_aioinfo; 684 685 if (ki->kaio_active_count < ki->kaio_maxactive_count) { 686 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 687 mtx_unlock(&aio_freeproc_mtx); 688 splx(s); 689 return (aiocbe); 690 } 691 } 692 mtx_unlock(&aio_freeproc_mtx); 693 splx(s); 694 695 return (NULL); 696 } 697 698 /* 699 * The AIO processing activity. This is the code that does the I/O request for 700 * the non-physio version of the operations. The normal vn operations are used, 701 * and this code should work in all instances for every type of file, including 702 * pipes, sockets, fifos, and regular files. 703 */ 704 static void 705 aio_process(struct aiocblist *aiocbe) 706 { 707 struct ucred *td_savedcred; 708 struct thread *td; 709 struct proc *mycp; 710 struct aiocb *cb; 711 struct file *fp; 712 struct uio auio; 713 struct iovec aiov; 714 int cnt; 715 int error; 716 int oublock_st, oublock_end; 717 int inblock_st, inblock_end; 718 719 td = curthread; 720 td_savedcred = td->td_ucred; 721 td->td_ucred = aiocbe->cred; 722 mycp = td->td_proc; 723 cb = &aiocbe->uaiocb; 724 fp = aiocbe->fd_file; 725 726 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; 727 aiov.iov_len = cb->aio_nbytes; 728 729 auio.uio_iov = &aiov; 730 auio.uio_iovcnt = 1; 731 auio.uio_offset = cb->aio_offset; 732 auio.uio_resid = cb->aio_nbytes; 733 cnt = cb->aio_nbytes; 734 auio.uio_segflg = UIO_USERSPACE; 735 auio.uio_td = td; 736 737 inblock_st = mycp->p_stats->p_ru.ru_inblock; 738 oublock_st = mycp->p_stats->p_ru.ru_oublock; 739 /* 740 * _aio_aqueue() acquires a reference to the file that is 741 * released in aio_free_entry(). 742 */ 743 if (cb->aio_lio_opcode == LIO_READ) { 744 auio.uio_rw = UIO_READ; 745 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td); 746 } else { 747 auio.uio_rw = UIO_WRITE; 748 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td); 749 } 750 inblock_end = mycp->p_stats->p_ru.ru_inblock; 751 oublock_end = mycp->p_stats->p_ru.ru_oublock; 752 753 aiocbe->inputcharge = inblock_end - inblock_st; 754 aiocbe->outputcharge = oublock_end - oublock_st; 755 756 if ((error) && (auio.uio_resid != cnt)) { 757 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 758 error = 0; 759 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) { 760 PROC_LOCK(aiocbe->userproc); 761 psignal(aiocbe->userproc, SIGPIPE); 762 PROC_UNLOCK(aiocbe->userproc); 763 } 764 } 765 766 cnt -= auio.uio_resid; 767 cb->_aiocb_private.error = error; 768 cb->_aiocb_private.status = cnt; 769 td->td_ucred = td_savedcred; 770 } 771 772 /* 773 * The AIO daemon, most of the actual work is done in aio_process, 774 * but the setup (and address space mgmt) is done in this routine. 775 */ 776 static void 777 aio_daemon(void *uproc) 778 { 779 int s; 780 struct aio_liojob *lj; 781 struct aiocb *cb; 782 struct aiocblist *aiocbe; 783 struct aiothreadlist *aiop; 784 struct kaioinfo *ki; 785 struct proc *curcp, *mycp, *userp; 786 struct vmspace *myvm, *tmpvm; 787 struct thread *td = curthread; 788 struct pgrp *newpgrp; 789 struct session *newsess; 790 791 /* 792 * Local copies of curproc (cp) and vmspace (myvm) 793 */ 794 mycp = td->td_proc; 795 myvm = mycp->p_vmspace; 796 797 KASSERT(mycp->p_textvp == NULL, ("kthread has a textvp")); 798 799 /* 800 * Allocate and ready the aio control info. There is one aiop structure 801 * per daemon. 802 */ 803 aiop = uma_zalloc(aiop_zone, M_WAITOK); 804 aiop->aiothread = td; 805 aiop->aiothreadflags |= AIOP_FREE; 806 807 /* 808 * Place thread (lightweight process) onto the AIO free thread list. 809 */ 810 mtx_lock(&aio_freeproc_mtx); 811 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 812 mtx_unlock(&aio_freeproc_mtx); 813 814 /* The daemon resides in its own pgrp. */ 815 MALLOC(newpgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP, 816 M_WAITOK | M_ZERO); 817 MALLOC(newsess, struct session *, sizeof(struct session), M_SESSION, 818 M_WAITOK | M_ZERO); 819 820 sx_xlock(&proctree_lock); 821 enterpgrp(mycp, mycp->p_pid, newpgrp, newsess); 822 sx_xunlock(&proctree_lock); 823 mtx_lock(&Giant); 824 825 /* 826 * Wakeup parent process. (Parent sleeps to keep from blasting away 827 * and creating too many daemons.) 828 */ 829 wakeup(mycp); 830 831 mtx_lock(&aio_freeproc_mtx); 832 for (;;) { 833 /* 834 * curcp is the current daemon process context. 835 * userp is the current user process context. 836 */ 837 curcp = mycp; 838 839 /* 840 * Take daemon off of free queue 841 */ 842 if (aiop->aiothreadflags & AIOP_FREE) { 843 TAILQ_REMOVE(&aio_freeproc, aiop, list); 844 aiop->aiothreadflags &= ~AIOP_FREE; 845 } 846 mtx_unlock(&aio_freeproc_mtx); 847 848 /* 849 * Check for jobs. 850 */ 851 while ((aiocbe = aio_selectjob(aiop)) != NULL) { 852 cb = &aiocbe->uaiocb; 853 userp = aiocbe->userproc; 854 855 aiocbe->jobstate = JOBST_JOBRUNNING; 856 857 /* 858 * Connect to process address space for user program. 859 */ 860 if (userp != curcp) { 861 /* 862 * Save the current address space that we are 863 * connected to. 864 */ 865 tmpvm = mycp->p_vmspace; 866 867 /* 868 * Point to the new user address space, and 869 * refer to it. 870 */ 871 mycp->p_vmspace = userp->p_vmspace; 872 atomic_add_int(&mycp->p_vmspace->vm_refcnt, 1); 873 874 /* Activate the new mapping. */ 875 pmap_activate(FIRST_THREAD_IN_PROC(mycp)); 876 877 /* 878 * If the old address space wasn't the daemons 879 * own address space, then we need to remove the 880 * daemon's reference from the other process 881 * that it was acting on behalf of. 882 */ 883 if (tmpvm != myvm) { 884 vmspace_free(tmpvm); 885 } 886 curcp = userp; 887 } 888 889 ki = userp->p_aioinfo; 890 lj = aiocbe->lio; 891 892 /* Account for currently active jobs. */ 893 ki->kaio_active_count++; 894 895 /* Do the I/O function. */ 896 aio_process(aiocbe); 897 898 /* Decrement the active job count. */ 899 ki->kaio_active_count--; 900 901 /* 902 * Increment the completion count for wakeup/signal 903 * comparisons. 904 */ 905 aiocbe->jobflags |= AIOCBLIST_DONE; 906 ki->kaio_queue_finished_count++; 907 if (lj) 908 lj->lioj_queue_finished_count++; 909 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags 910 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) { 911 ki->kaio_flags &= ~KAIO_WAKEUP; 912 wakeup(userp); 913 } 914 915 s = splbio(); 916 if (lj && (lj->lioj_flags & 917 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) { 918 if ((lj->lioj_queue_finished_count == 919 lj->lioj_queue_count) && 920 (lj->lioj_buffer_finished_count == 921 lj->lioj_buffer_count)) { 922 PROC_LOCK(userp); 923 psignal(userp, 924 lj->lioj_signal.sigev_signo); 925 PROC_UNLOCK(userp); 926 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 927 } 928 } 929 splx(s); 930 931 aiocbe->jobstate = JOBST_JOBFINISHED; 932 933 s = splnet(); 934 mtx_lock(&aio_freeproc_mtx); 935 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 936 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist); 937 mtx_unlock(&aio_freeproc_mtx); 938 splx(s); 939 KNOTE_UNLOCKED(&aiocbe->klist, 0); 940 941 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) { 942 wakeup(aiocbe); 943 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN; 944 } 945 946 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 947 PROC_LOCK(userp); 948 psignal(userp, cb->aio_sigevent.sigev_signo); 949 PROC_UNLOCK(userp); 950 } 951 } 952 953 /* 954 * Disconnect from user address space. 955 */ 956 if (curcp != mycp) { 957 /* Get the user address space to disconnect from. */ 958 tmpvm = mycp->p_vmspace; 959 960 /* Get original address space for daemon. */ 961 mycp->p_vmspace = myvm; 962 963 /* Activate the daemon's address space. */ 964 pmap_activate(FIRST_THREAD_IN_PROC(mycp)); 965 #ifdef DIAGNOSTIC 966 if (tmpvm == myvm) { 967 printf("AIOD: vmspace problem -- %d\n", 968 mycp->p_pid); 969 } 970 #endif 971 /* Remove our vmspace reference. */ 972 vmspace_free(tmpvm); 973 974 curcp = mycp; 975 } 976 977 mtx_lock(&aio_freeproc_mtx); 978 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 979 aiop->aiothreadflags |= AIOP_FREE; 980 981 /* 982 * If daemon is inactive for a long time, allow it to exit, 983 * thereby freeing resources. 984 */ 985 if (msleep(aiop->aiothread, &aio_freeproc_mtx, PRIBIO, 986 "aiordy", aiod_lifetime)) { 987 s = splnet(); 988 if (TAILQ_EMPTY(&aio_jobs)) { 989 if ((aiop->aiothreadflags & AIOP_FREE) && 990 (num_aio_procs > target_aio_procs)) { 991 TAILQ_REMOVE(&aio_freeproc, aiop, list); 992 mtx_unlock(&aio_freeproc_mtx); 993 splx(s); 994 uma_zfree(aiop_zone, aiop); 995 num_aio_procs--; 996 #ifdef DIAGNOSTIC 997 if (mycp->p_vmspace->vm_refcnt <= 1) { 998 printf("AIOD: bad vm refcnt for" 999 " exiting daemon: %d\n", 1000 mycp->p_vmspace->vm_refcnt); 1001 } 1002 #endif 1003 kthread_exit(0); 1004 } 1005 } 1006 splx(s); 1007 } 1008 } 1009 } 1010 1011 /* 1012 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 1013 * AIO daemon modifies its environment itself. 1014 */ 1015 static int 1016 aio_newproc(void) 1017 { 1018 int error; 1019 struct proc *p; 1020 1021 error = kthread_create(aio_daemon, curproc, &p, RFNOWAIT, 0, "aiod%d", 1022 num_aio_procs); 1023 if (error) 1024 return (error); 1025 1026 /* 1027 * Wait until daemon is started, but continue on just in case to 1028 * handle error conditions. 1029 */ 1030 error = tsleep(p, PZERO, "aiosta", aiod_timeout); 1031 1032 num_aio_procs++; 1033 1034 return (error); 1035 } 1036 1037 /* 1038 * Try the high-performance, low-overhead physio method for eligible 1039 * VCHR devices. This method doesn't use an aio helper thread, and 1040 * thus has very low overhead. 1041 * 1042 * Assumes that the caller, _aio_aqueue(), has incremented the file 1043 * structure's reference count, preventing its deallocation for the 1044 * duration of this call. 1045 */ 1046 static int 1047 aio_qphysio(struct proc *p, struct aiocblist *aiocbe) 1048 { 1049 int error; 1050 struct aiocb *cb; 1051 struct file *fp; 1052 struct buf *bp; 1053 struct vnode *vp; 1054 struct kaioinfo *ki; 1055 struct aio_liojob *lj; 1056 int s; 1057 int notify; 1058 1059 cb = &aiocbe->uaiocb; 1060 fp = aiocbe->fd_file; 1061 1062 if (fp->f_type != DTYPE_VNODE) 1063 return (-1); 1064 1065 vp = fp->f_vnode; 1066 1067 /* 1068 * If its not a disk, we don't want to return a positive error. 1069 * It causes the aio code to not fall through to try the thread 1070 * way when you're talking to a regular file. 1071 */ 1072 if (!vn_isdisk(vp, &error)) { 1073 if (error == ENOTBLK) 1074 return (-1); 1075 else 1076 return (error); 1077 } 1078 1079 if (vp->v_bufobj.bo_bsize == 0) 1080 return (-1); 1081 1082 if (cb->aio_nbytes % vp->v_bufobj.bo_bsize) 1083 return (-1); 1084 1085 if (cb->aio_nbytes > 1086 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK)) 1087 return (-1); 1088 1089 ki = p->p_aioinfo; 1090 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) 1091 return (-1); 1092 1093 ki->kaio_buffer_count++; 1094 1095 lj = aiocbe->lio; 1096 if (lj) 1097 lj->lioj_buffer_count++; 1098 1099 /* Create and build a buffer header for a transfer. */ 1100 bp = (struct buf *)getpbuf(NULL); 1101 BUF_KERNPROC(bp); 1102 1103 /* 1104 * Get a copy of the kva from the physical buffer. 1105 */ 1106 error = 0; 1107 1108 bp->b_bcount = cb->aio_nbytes; 1109 bp->b_bufsize = cb->aio_nbytes; 1110 bp->b_iodone = aio_physwakeup; 1111 bp->b_saveaddr = bp->b_data; 1112 bp->b_data = (void *)(uintptr_t)cb->aio_buf; 1113 bp->b_offset = cb->aio_offset; 1114 bp->b_iooffset = cb->aio_offset; 1115 bp->b_blkno = btodb(cb->aio_offset); 1116 bp->b_iocmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ; 1117 1118 /* 1119 * Bring buffer into kernel space. 1120 */ 1121 if (vmapbuf(bp) < 0) { 1122 error = EFAULT; 1123 goto doerror; 1124 } 1125 1126 s = splbio(); 1127 aiocbe->bp = bp; 1128 bp->b_caller1 = (void *)aiocbe; 1129 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); 1130 aiocbe->jobstate = JOBST_JOBQBUF; 1131 cb->_aiocb_private.status = cb->aio_nbytes; 1132 num_buf_aio++; 1133 bp->b_error = 0; 1134 1135 splx(s); 1136 1137 /* Perform transfer. */ 1138 dev_strategy(vp->v_rdev, bp); 1139 1140 notify = 0; 1141 s = splbio(); 1142 1143 /* 1144 * If we had an error invoking the request, or an error in processing 1145 * the request before we have returned, we process it as an error in 1146 * transfer. Note that such an I/O error is not indicated immediately, 1147 * but is returned using the aio_error mechanism. In this case, 1148 * aio_suspend will return immediately. 1149 */ 1150 if (bp->b_error || (bp->b_ioflags & BIO_ERROR)) { 1151 struct aiocb *job = aiocbe->uuaiocb; 1152 1153 aiocbe->uaiocb._aiocb_private.status = 0; 1154 suword(&job->_aiocb_private.status, 0); 1155 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 1156 suword(&job->_aiocb_private.error, bp->b_error); 1157 1158 ki->kaio_buffer_finished_count++; 1159 1160 if (aiocbe->jobstate != JOBST_JOBBFINISHED) { 1161 aiocbe->jobstate = JOBST_JOBBFINISHED; 1162 aiocbe->jobflags |= AIOCBLIST_DONE; 1163 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 1164 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 1165 notify = 1; 1166 } 1167 } 1168 splx(s); 1169 if (notify) 1170 KNOTE_UNLOCKED(&aiocbe->klist, 0); 1171 return (0); 1172 1173 doerror: 1174 ki->kaio_buffer_count--; 1175 if (lj) 1176 lj->lioj_buffer_count--; 1177 aiocbe->bp = NULL; 1178 relpbuf(bp, NULL); 1179 return (error); 1180 } 1181 1182 /* 1183 * This waits/tests physio completion. 1184 */ 1185 static int 1186 aio_fphysio(struct aiocblist *iocb) 1187 { 1188 int s; 1189 struct buf *bp; 1190 int error; 1191 1192 bp = iocb->bp; 1193 1194 s = splbio(); 1195 while ((bp->b_flags & B_DONE) == 0) { 1196 if (tsleep(bp, PRIBIO, "physstr", aiod_timeout)) { 1197 if ((bp->b_flags & B_DONE) == 0) { 1198 splx(s); 1199 return (EINPROGRESS); 1200 } else 1201 break; 1202 } 1203 } 1204 splx(s); 1205 1206 /* Release mapping into kernel space. */ 1207 vunmapbuf(bp); 1208 iocb->bp = 0; 1209 1210 error = 0; 1211 1212 /* Check for an error. */ 1213 if (bp->b_ioflags & BIO_ERROR) 1214 error = bp->b_error; 1215 1216 relpbuf(bp, NULL); 1217 return (error); 1218 } 1219 1220 /* 1221 * Wake up aio requests that may be serviceable now. 1222 */ 1223 static void 1224 aio_swake_cb(struct socket *so, struct sockbuf *sb) 1225 { 1226 struct aiocblist *cb,*cbn; 1227 struct proc *p; 1228 struct kaioinfo *ki = NULL; 1229 int opcode, wakecount = 0; 1230 struct aiothreadlist *aiop; 1231 1232 if (sb == &so->so_snd) { 1233 opcode = LIO_WRITE; 1234 SOCKBUF_LOCK(&so->so_snd); 1235 so->so_snd.sb_flags &= ~SB_AIO; 1236 SOCKBUF_UNLOCK(&so->so_snd); 1237 } else { 1238 opcode = LIO_READ; 1239 SOCKBUF_LOCK(&so->so_rcv); 1240 so->so_rcv.sb_flags &= ~SB_AIO; 1241 SOCKBUF_UNLOCK(&so->so_rcv); 1242 } 1243 1244 mtx_lock(&aio_freeproc_mtx); 1245 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) { 1246 cbn = TAILQ_NEXT(cb, list); 1247 if (opcode == cb->uaiocb.aio_lio_opcode) { 1248 p = cb->userproc; 1249 ki = p->p_aioinfo; 1250 TAILQ_REMOVE(&so->so_aiojobq, cb, list); 1251 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist); 1252 TAILQ_INSERT_TAIL(&aio_jobs, cb, list); 1253 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist); 1254 wakecount++; 1255 if (cb->jobstate != JOBST_JOBQGLOBAL) 1256 panic("invalid queue value"); 1257 } 1258 } 1259 1260 while (wakecount--) { 1261 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) { 1262 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1263 aiop->aiothreadflags &= ~AIOP_FREE; 1264 wakeup(aiop->aiothread); 1265 } 1266 } 1267 mtx_unlock(&aio_freeproc_mtx); 1268 } 1269 1270 /* 1271 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR 1272 * technique is done in this code. 1273 */ 1274 static int 1275 _aio_aqueue(struct thread *td, struct aiocb *job, struct aio_liojob *lj, int type) 1276 { 1277 struct proc *p = td->td_proc; 1278 struct filedesc *fdp; 1279 struct file *fp; 1280 unsigned int fd; 1281 struct socket *so; 1282 int s; 1283 int error; 1284 int opcode; 1285 struct aiocblist *aiocbe; 1286 struct aiothreadlist *aiop; 1287 struct kaioinfo *ki; 1288 struct kevent kev; 1289 struct kqueue *kq; 1290 struct file *kq_fp; 1291 struct sockbuf *sb; 1292 1293 aiocbe = uma_zalloc(aiocb_zone, M_WAITOK); 1294 aiocbe->inputcharge = 0; 1295 aiocbe->outputcharge = 0; 1296 /* XXX - need a lock */ 1297 knlist_init(&aiocbe->klist, NULL, NULL, NULL, NULL); 1298 1299 suword(&job->_aiocb_private.status, -1); 1300 suword(&job->_aiocb_private.error, 0); 1301 suword(&job->_aiocb_private.kernelinfo, -1); 1302 1303 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb)); 1304 if (error) { 1305 suword(&job->_aiocb_private.error, error); 1306 uma_zfree(aiocb_zone, aiocbe); 1307 return (error); 1308 } 1309 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL && 1310 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) { 1311 uma_zfree(aiocb_zone, aiocbe); 1312 return (EINVAL); 1313 } 1314 1315 /* Save userspace address of the job info. */ 1316 aiocbe->uuaiocb = job; 1317 1318 /* Get the opcode. */ 1319 if (type != LIO_NOP) 1320 aiocbe->uaiocb.aio_lio_opcode = type; 1321 opcode = aiocbe->uaiocb.aio_lio_opcode; 1322 1323 /* Get the fd info for process. */ 1324 fdp = p->p_fd; 1325 1326 /* 1327 * Range check file descriptor. 1328 */ 1329 FILEDESC_LOCK(fdp); 1330 fd = aiocbe->uaiocb.aio_fildes; 1331 if (fd >= fdp->fd_nfiles) { 1332 FILEDESC_UNLOCK(fdp); 1333 uma_zfree(aiocb_zone, aiocbe); 1334 if (type == 0) 1335 suword(&job->_aiocb_private.error, EBADF); 1336 return (EBADF); 1337 } 1338 1339 fp = aiocbe->fd_file = fdp->fd_ofiles[fd]; 1340 if ((fp == NULL) || 1341 ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) == 0)) || 1342 ((opcode == LIO_READ) && ((fp->f_flag & FREAD) == 0))) { 1343 FILEDESC_UNLOCK(fdp); 1344 uma_zfree(aiocb_zone, aiocbe); 1345 if (type == 0) 1346 suword(&job->_aiocb_private.error, EBADF); 1347 return (EBADF); 1348 } 1349 fhold(fp); 1350 FILEDESC_UNLOCK(fdp); 1351 1352 if (aiocbe->uaiocb.aio_offset == -1LL) { 1353 error = EINVAL; 1354 goto aqueue_fail; 1355 } 1356 error = suword(&job->_aiocb_private.kernelinfo, jobrefid); 1357 if (error) { 1358 error = EINVAL; 1359 goto aqueue_fail; 1360 } 1361 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid; 1362 if (jobrefid == LONG_MAX) 1363 jobrefid = 1; 1364 else 1365 jobrefid++; 1366 1367 if (opcode == LIO_NOP) { 1368 fdrop(fp, td); 1369 uma_zfree(aiocb_zone, aiocbe); 1370 if (type == 0) { 1371 suword(&job->_aiocb_private.error, 0); 1372 suword(&job->_aiocb_private.status, 0); 1373 suword(&job->_aiocb_private.kernelinfo, 0); 1374 } 1375 return (0); 1376 } 1377 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) { 1378 if (type == 0) 1379 suword(&job->_aiocb_private.status, 0); 1380 error = EINVAL; 1381 goto aqueue_fail; 1382 } 1383 1384 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) { 1385 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue; 1386 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr; 1387 } else 1388 goto no_kqueue; 1389 if ((u_int)kev.ident >= fdp->fd_nfiles || 1390 (kq_fp = fdp->fd_ofiles[kev.ident]) == NULL || 1391 (kq_fp->f_type != DTYPE_KQUEUE)) { 1392 error = EBADF; 1393 goto aqueue_fail; 1394 } 1395 kq = kq_fp->f_data; 1396 kev.ident = (uintptr_t)aiocbe->uuaiocb; 1397 kev.filter = EVFILT_AIO; 1398 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 1399 kev.data = (intptr_t)aiocbe; 1400 error = kqueue_register(kq, &kev, td, 1); 1401 aqueue_fail: 1402 if (error) { 1403 fdrop(fp, td); 1404 uma_zfree(aiocb_zone, aiocbe); 1405 if (type == 0) 1406 suword(&job->_aiocb_private.error, error); 1407 goto done; 1408 } 1409 no_kqueue: 1410 1411 suword(&job->_aiocb_private.error, EINPROGRESS); 1412 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; 1413 aiocbe->userproc = p; 1414 aiocbe->cred = crhold(td->td_ucred); 1415 aiocbe->jobflags = 0; 1416 aiocbe->lio = lj; 1417 ki = p->p_aioinfo; 1418 1419 if (fp->f_type == DTYPE_SOCKET) { 1420 /* 1421 * Alternate queueing for socket ops: Reach down into the 1422 * descriptor to get the socket data. Then check to see if the 1423 * socket is ready to be read or written (based on the requested 1424 * operation). 1425 * 1426 * If it is not ready for io, then queue the aiocbe on the 1427 * socket, and set the flags so we get a call when sbnotify() 1428 * happens. 1429 * 1430 * Note if opcode is neither LIO_WRITE nor LIO_READ we lock 1431 * and unlock the snd sockbuf for no reason. 1432 */ 1433 so = fp->f_data; 1434 sb = (opcode == LIO_READ) ? &so->so_rcv : &so->so_snd; 1435 mtx_lock(&aio_freeproc_mtx); 1436 SOCKBUF_LOCK(sb); 1437 s = splnet(); 1438 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode == 1439 LIO_WRITE) && (!sowriteable(so)))) { 1440 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list); 1441 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist); 1442 sb->sb_flags |= SB_AIO; 1443 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */ 1444 ki->kaio_queue_count++; 1445 num_queue_count++; 1446 SOCKBUF_UNLOCK(sb); 1447 mtx_unlock(&aio_freeproc_mtx); 1448 splx(s); 1449 error = 0; 1450 goto done; 1451 } 1452 SOCKBUF_UNLOCK(sb); 1453 mtx_unlock(&aio_freeproc_mtx); 1454 splx(s); 1455 } 1456 1457 if ((error = aio_qphysio(p, aiocbe)) == 0) 1458 goto done; 1459 if (error > 0) { 1460 suword(&job->_aiocb_private.status, 0); 1461 aiocbe->uaiocb._aiocb_private.error = error; 1462 suword(&job->_aiocb_private.error, error); 1463 goto done; 1464 } 1465 1466 /* No buffer for daemon I/O. */ 1467 aiocbe->bp = NULL; 1468 1469 ki->kaio_queue_count++; 1470 if (lj) 1471 lj->lioj_queue_count++; 1472 s = splnet(); 1473 mtx_lock(&aio_freeproc_mtx); 1474 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); 1475 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); 1476 splx(s); 1477 aiocbe->jobstate = JOBST_JOBQGLOBAL; 1478 1479 num_queue_count++; 1480 error = 0; 1481 1482 /* 1483 * If we don't have a free AIO process, and we are below our quota, then 1484 * start one. Otherwise, depend on the subsequent I/O completions to 1485 * pick-up this job. If we don't sucessfully create the new process 1486 * (thread) due to resource issues, we return an error for now (EAGAIN), 1487 * which is likely not the correct thing to do. 1488 */ 1489 retryproc: 1490 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1491 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1492 aiop->aiothreadflags &= ~AIOP_FREE; 1493 wakeup(aiop->aiothread); 1494 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && 1495 ((ki->kaio_active_count + num_aio_resv_start) < 1496 ki->kaio_maxactive_count)) { 1497 num_aio_resv_start++; 1498 mtx_unlock(&aio_freeproc_mtx); 1499 if ((error = aio_newproc()) == 0) { 1500 mtx_lock(&aio_freeproc_mtx); 1501 num_aio_resv_start--; 1502 goto retryproc; 1503 } 1504 mtx_lock(&aio_freeproc_mtx); 1505 num_aio_resv_start--; 1506 } 1507 mtx_unlock(&aio_freeproc_mtx); 1508 done: 1509 return (error); 1510 } 1511 1512 /* 1513 * This routine queues an AIO request, checking for quotas. 1514 */ 1515 static int 1516 aio_aqueue(struct thread *td, struct aiocb *job, int type) 1517 { 1518 struct proc *p = td->td_proc; 1519 struct kaioinfo *ki; 1520 1521 if (p->p_aioinfo == NULL) 1522 aio_init_aioinfo(p); 1523 1524 if (num_queue_count >= max_queue_count) 1525 return (EAGAIN); 1526 1527 ki = p->p_aioinfo; 1528 if (ki->kaio_queue_count >= ki->kaio_qallowed_count) 1529 return (EAGAIN); 1530 1531 return _aio_aqueue(td, job, NULL, type); 1532 } 1533 1534 /* 1535 * Support the aio_return system call, as a side-effect, kernel resources are 1536 * released. 1537 */ 1538 int 1539 aio_return(struct thread *td, struct aio_return_args *uap) 1540 { 1541 struct proc *p = td->td_proc; 1542 int s; 1543 long jobref; 1544 struct aiocblist *cb, *ncb; 1545 struct aiocb *ujob; 1546 struct kaioinfo *ki; 1547 1548 ujob = uap->aiocbp; 1549 jobref = fuword(&ujob->_aiocb_private.kernelinfo); 1550 if (jobref == -1 || jobref == 0) 1551 return (EINVAL); 1552 1553 ki = p->p_aioinfo; 1554 if (ki == NULL) 1555 return (EINVAL); 1556 PROC_LOCK(p); 1557 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1558 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == 1559 jobref) { 1560 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 1561 p->p_stats->p_ru.ru_oublock += 1562 cb->outputcharge; 1563 cb->outputcharge = 0; 1564 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 1565 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 1566 cb->inputcharge = 0; 1567 } 1568 goto done; 1569 } 1570 } 1571 s = splbio(); 1572 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) { 1573 ncb = TAILQ_NEXT(cb, plist); 1574 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) 1575 == jobref) { 1576 break; 1577 } 1578 } 1579 splx(s); 1580 done: 1581 PROC_UNLOCK(p); 1582 if (cb != NULL) { 1583 if (ujob == cb->uuaiocb) { 1584 td->td_retval[0] = 1585 cb->uaiocb._aiocb_private.status; 1586 } else 1587 td->td_retval[0] = EFAULT; 1588 aio_free_entry(cb); 1589 return (0); 1590 } 1591 return (EINVAL); 1592 } 1593 1594 /* 1595 * Allow a process to wakeup when any of the I/O requests are completed. 1596 */ 1597 int 1598 aio_suspend(struct thread *td, struct aio_suspend_args *uap) 1599 { 1600 struct proc *p = td->td_proc; 1601 struct timeval atv; 1602 struct timespec ts; 1603 struct aiocb *const *cbptr, *cbp; 1604 struct kaioinfo *ki; 1605 struct aiocblist *cb; 1606 int i; 1607 int njoblist; 1608 int error, s, timo; 1609 long *ijoblist; 1610 struct aiocb **ujoblist; 1611 1612 if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX) 1613 return (EINVAL); 1614 1615 timo = 0; 1616 if (uap->timeout) { 1617 /* Get timespec struct. */ 1618 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 1619 return (error); 1620 1621 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) 1622 return (EINVAL); 1623 1624 TIMESPEC_TO_TIMEVAL(&atv, &ts); 1625 if (itimerfix(&atv)) 1626 return (EINVAL); 1627 timo = tvtohz(&atv); 1628 } 1629 1630 ki = p->p_aioinfo; 1631 if (ki == NULL) 1632 return (EAGAIN); 1633 1634 njoblist = 0; 1635 ijoblist = uma_zalloc(aiol_zone, M_WAITOK); 1636 ujoblist = uma_zalloc(aiol_zone, M_WAITOK); 1637 cbptr = uap->aiocbp; 1638 1639 for (i = 0; i < uap->nent; i++) { 1640 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1641 if (cbp == 0) 1642 continue; 1643 ujoblist[njoblist] = cbp; 1644 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo); 1645 njoblist++; 1646 } 1647 1648 if (njoblist == 0) { 1649 uma_zfree(aiol_zone, ijoblist); 1650 uma_zfree(aiol_zone, ujoblist); 1651 return (0); 1652 } 1653 1654 error = 0; 1655 for (;;) { 1656 PROC_LOCK(p); 1657 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1658 for (i = 0; i < njoblist; i++) { 1659 if (((intptr_t) 1660 cb->uaiocb._aiocb_private.kernelinfo) == 1661 ijoblist[i]) { 1662 PROC_UNLOCK(p); 1663 if (ujoblist[i] != cb->uuaiocb) 1664 error = EINVAL; 1665 uma_zfree(aiol_zone, ijoblist); 1666 uma_zfree(aiol_zone, ujoblist); 1667 return (error); 1668 } 1669 } 1670 } 1671 1672 s = splbio(); 1673 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = 1674 TAILQ_NEXT(cb, plist)) { 1675 for (i = 0; i < njoblist; i++) { 1676 if (((intptr_t) 1677 cb->uaiocb._aiocb_private.kernelinfo) == 1678 ijoblist[i]) { 1679 PROC_UNLOCK(p); 1680 splx(s); 1681 if (ujoblist[i] != cb->uuaiocb) 1682 error = EINVAL; 1683 uma_zfree(aiol_zone, ijoblist); 1684 uma_zfree(aiol_zone, ujoblist); 1685 return (error); 1686 } 1687 } 1688 } 1689 1690 ki->kaio_flags |= KAIO_WAKEUP; 1691 error = msleep(p, &p->p_mtx, PDROP | PRIBIO | PCATCH, "aiospn", 1692 timo); 1693 splx(s); 1694 1695 if (error == ERESTART || error == EINTR) { 1696 uma_zfree(aiol_zone, ijoblist); 1697 uma_zfree(aiol_zone, ujoblist); 1698 return (EINTR); 1699 } else if (error == EWOULDBLOCK) { 1700 uma_zfree(aiol_zone, ijoblist); 1701 uma_zfree(aiol_zone, ujoblist); 1702 return (EAGAIN); 1703 } 1704 } 1705 1706 /* NOTREACHED */ 1707 return (EINVAL); 1708 } 1709 1710 /* 1711 * aio_cancel cancels any non-physio aio operations not currently in 1712 * progress. 1713 */ 1714 int 1715 aio_cancel(struct thread *td, struct aio_cancel_args *uap) 1716 { 1717 struct proc *p = td->td_proc; 1718 struct kaioinfo *ki; 1719 struct aiocblist *cbe, *cbn; 1720 struct file *fp; 1721 struct filedesc *fdp; 1722 struct socket *so; 1723 struct proc *po; 1724 int s,error; 1725 int cancelled=0; 1726 int notcancelled=0; 1727 struct vnode *vp; 1728 1729 fdp = p->p_fd; 1730 if ((u_int)uap->fd >= fdp->fd_nfiles || 1731 (fp = fdp->fd_ofiles[uap->fd]) == NULL) 1732 return (EBADF); 1733 1734 if (fp->f_type == DTYPE_VNODE) { 1735 vp = fp->f_vnode; 1736 1737 if (vn_isdisk(vp,&error)) { 1738 td->td_retval[0] = AIO_NOTCANCELED; 1739 return (0); 1740 } 1741 } else if (fp->f_type == DTYPE_SOCKET) { 1742 so = fp->f_data; 1743 1744 s = splnet(); 1745 1746 mtx_lock(&aio_freeproc_mtx); 1747 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) { 1748 cbn = TAILQ_NEXT(cbe, list); 1749 if ((uap->aiocbp == NULL) || 1750 (uap->aiocbp == cbe->uuaiocb) ) { 1751 po = cbe->userproc; 1752 ki = po->p_aioinfo; 1753 TAILQ_REMOVE(&so->so_aiojobq, cbe, list); 1754 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist); 1755 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist); 1756 if (ki->kaio_flags & KAIO_WAKEUP) { 1757 wakeup(po); 1758 } 1759 cbe->jobstate = JOBST_JOBFINISHED; 1760 cbe->uaiocb._aiocb_private.status=-1; 1761 cbe->uaiocb._aiocb_private.error=ECANCELED; 1762 cancelled++; 1763 /* XXX cancelled, knote? */ 1764 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1765 SIGEV_SIGNAL) { 1766 PROC_LOCK(cbe->userproc); 1767 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1768 PROC_UNLOCK(cbe->userproc); 1769 } 1770 if (uap->aiocbp) 1771 break; 1772 } 1773 } 1774 mtx_unlock(&aio_freeproc_mtx); 1775 splx(s); 1776 1777 if ((cancelled) && (uap->aiocbp)) { 1778 td->td_retval[0] = AIO_CANCELED; 1779 return (0); 1780 } 1781 } 1782 ki=p->p_aioinfo; 1783 if (ki == NULL) 1784 goto done; 1785 s = splnet(); 1786 1787 mtx_lock(&aio_freeproc_mtx); 1788 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) { 1789 cbn = TAILQ_NEXT(cbe, plist); 1790 1791 if ((uap->fd == cbe->uaiocb.aio_fildes) && 1792 ((uap->aiocbp == NULL ) || 1793 (uap->aiocbp == cbe->uuaiocb))) { 1794 1795 if (cbe->jobstate == JOBST_JOBQGLOBAL) { 1796 TAILQ_REMOVE(&aio_jobs, cbe, list); 1797 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); 1798 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, 1799 plist); 1800 cancelled++; 1801 ki->kaio_queue_finished_count++; 1802 cbe->jobstate = JOBST_JOBFINISHED; 1803 cbe->uaiocb._aiocb_private.status = -1; 1804 cbe->uaiocb._aiocb_private.error = ECANCELED; 1805 /* XXX cancelled, knote? */ 1806 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1807 SIGEV_SIGNAL) { 1808 PROC_LOCK(cbe->userproc); 1809 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1810 PROC_UNLOCK(cbe->userproc); 1811 } 1812 } else { 1813 notcancelled++; 1814 } 1815 } 1816 } 1817 mtx_unlock(&aio_freeproc_mtx); 1818 splx(s); 1819 done: 1820 if (notcancelled) { 1821 td->td_retval[0] = AIO_NOTCANCELED; 1822 return (0); 1823 } 1824 if (cancelled) { 1825 td->td_retval[0] = AIO_CANCELED; 1826 return (0); 1827 } 1828 td->td_retval[0] = AIO_ALLDONE; 1829 1830 return (0); 1831 } 1832 1833 /* 1834 * aio_error is implemented in the kernel level for compatibility purposes only. 1835 * For a user mode async implementation, it would be best to do it in a userland 1836 * subroutine. 1837 */ 1838 int 1839 aio_error(struct thread *td, struct aio_error_args *uap) 1840 { 1841 struct proc *p = td->td_proc; 1842 int s; 1843 struct aiocblist *cb; 1844 struct kaioinfo *ki; 1845 long jobref; 1846 1847 ki = p->p_aioinfo; 1848 if (ki == NULL) 1849 return (EINVAL); 1850 1851 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo); 1852 if ((jobref == -1) || (jobref == 0)) 1853 return (EINVAL); 1854 1855 mtx_lock(&aio_freeproc_mtx); 1856 PROC_LOCK(p); 1857 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1858 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1859 jobref) { 1860 PROC_UNLOCK(p); 1861 mtx_unlock(&aio_freeproc_mtx); 1862 td->td_retval[0] = cb->uaiocb._aiocb_private.error; 1863 return (0); 1864 } 1865 } 1866 1867 s = splnet(); 1868 1869 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb, 1870 plist)) { 1871 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1872 jobref) { 1873 PROC_UNLOCK(p); 1874 mtx_unlock(&aio_freeproc_mtx); 1875 td->td_retval[0] = EINPROGRESS; 1876 splx(s); 1877 return (0); 1878 } 1879 } 1880 1881 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb, 1882 plist)) { 1883 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1884 jobref) { 1885 PROC_UNLOCK(p); 1886 mtx_unlock(&aio_freeproc_mtx); 1887 td->td_retval[0] = EINPROGRESS; 1888 splx(s); 1889 return (0); 1890 } 1891 } 1892 splx(s); 1893 1894 s = splbio(); 1895 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, 1896 plist)) { 1897 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1898 jobref) { 1899 PROC_UNLOCK(p); 1900 mtx_unlock(&aio_freeproc_mtx); 1901 td->td_retval[0] = cb->uaiocb._aiocb_private.error; 1902 splx(s); 1903 return (0); 1904 } 1905 } 1906 1907 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb, 1908 plist)) { 1909 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1910 jobref) { 1911 PROC_UNLOCK(p); 1912 mtx_unlock(&aio_freeproc_mtx); 1913 td->td_retval[0] = EINPROGRESS; 1914 splx(s); 1915 return (0); 1916 } 1917 } 1918 splx(s); 1919 PROC_UNLOCK(p); 1920 mtx_unlock(&aio_freeproc_mtx); 1921 1922 #if (0) 1923 /* 1924 * Hack for lio. 1925 */ 1926 status = fuword(&uap->aiocbp->_aiocb_private.status); 1927 if (status == -1) 1928 return fuword(&uap->aiocbp->_aiocb_private.error); 1929 #endif 1930 return (EINVAL); 1931 } 1932 1933 /* syscall - asynchronous read from a file (REALTIME) */ 1934 int 1935 aio_read(struct thread *td, struct aio_read_args *uap) 1936 { 1937 1938 return aio_aqueue(td, uap->aiocbp, LIO_READ); 1939 } 1940 1941 /* syscall - asynchronous write to a file (REALTIME) */ 1942 int 1943 aio_write(struct thread *td, struct aio_write_args *uap) 1944 { 1945 1946 return aio_aqueue(td, uap->aiocbp, LIO_WRITE); 1947 } 1948 1949 /* syscall - list directed I/O (REALTIME) */ 1950 int 1951 lio_listio(struct thread *td, struct lio_listio_args *uap) 1952 { 1953 struct proc *p = td->td_proc; 1954 int nent, nentqueued; 1955 struct aiocb *iocb, * const *cbptr; 1956 struct aiocblist *cb; 1957 struct kaioinfo *ki; 1958 struct aio_liojob *lj; 1959 int error, runningcode; 1960 int nerror; 1961 int i; 1962 int s; 1963 1964 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 1965 return (EINVAL); 1966 1967 nent = uap->nent; 1968 if (nent < 0 || nent > AIO_LISTIO_MAX) 1969 return (EINVAL); 1970 1971 if (p->p_aioinfo == NULL) 1972 aio_init_aioinfo(p); 1973 1974 if ((nent + num_queue_count) > max_queue_count) 1975 return (EAGAIN); 1976 1977 ki = p->p_aioinfo; 1978 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) 1979 return (EAGAIN); 1980 1981 lj = uma_zalloc(aiolio_zone, M_WAITOK); 1982 if (!lj) 1983 return (EAGAIN); 1984 1985 lj->lioj_flags = 0; 1986 lj->lioj_buffer_count = 0; 1987 lj->lioj_buffer_finished_count = 0; 1988 lj->lioj_queue_count = 0; 1989 lj->lioj_queue_finished_count = 0; 1990 1991 /* 1992 * Setup signal. 1993 */ 1994 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 1995 error = copyin(uap->sig, &lj->lioj_signal, 1996 sizeof(lj->lioj_signal)); 1997 if (error) { 1998 uma_zfree(aiolio_zone, lj); 1999 return (error); 2000 } 2001 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 2002 uma_zfree(aiolio_zone, lj); 2003 return (EINVAL); 2004 } 2005 lj->lioj_flags |= LIOJ_SIGNAL; 2006 } 2007 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 2008 /* 2009 * Get pointers to the list of I/O requests. 2010 */ 2011 nerror = 0; 2012 nentqueued = 0; 2013 cbptr = uap->acb_list; 2014 for (i = 0; i < uap->nent; i++) { 2015 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 2016 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) { 2017 error = _aio_aqueue(td, iocb, lj, 0); 2018 if (error == 0) 2019 nentqueued++; 2020 else 2021 nerror++; 2022 } 2023 } 2024 2025 /* 2026 * If we haven't queued any, then just return error. 2027 */ 2028 if (nentqueued == 0) 2029 return (0); 2030 2031 /* 2032 * Calculate the appropriate error return. 2033 */ 2034 runningcode = 0; 2035 if (nerror) 2036 runningcode = EIO; 2037 2038 if (uap->mode == LIO_WAIT) { 2039 int command, found; 2040 long jobref; 2041 2042 for (;;) { 2043 found = 0; 2044 for (i = 0; i < uap->nent; i++) { 2045 /* 2046 * Fetch address of the control buf pointer in 2047 * user space. 2048 */ 2049 iocb = (struct aiocb *) 2050 (intptr_t)fuword(&cbptr[i]); 2051 if (((intptr_t)iocb == -1) || ((intptr_t)iocb 2052 == 0)) 2053 continue; 2054 2055 /* 2056 * Fetch the associated command from user space. 2057 */ 2058 command = fuword(&iocb->aio_lio_opcode); 2059 if (command == LIO_NOP) { 2060 found++; 2061 continue; 2062 } 2063 2064 jobref = 2065 fuword(&iocb->_aiocb_private.kernelinfo); 2066 2067 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 2068 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 2069 == jobref) { 2070 if (cb->uaiocb.aio_lio_opcode 2071 == LIO_WRITE) { 2072 p->p_stats->p_ru.ru_oublock 2073 += 2074 cb->outputcharge; 2075 cb->outputcharge = 0; 2076 } else if (cb->uaiocb.aio_lio_opcode 2077 == LIO_READ) { 2078 p->p_stats->p_ru.ru_inblock 2079 += cb->inputcharge; 2080 cb->inputcharge = 0; 2081 } 2082 found++; 2083 break; 2084 } 2085 } 2086 2087 s = splbio(); 2088 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) { 2089 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 2090 == jobref) { 2091 found++; 2092 break; 2093 } 2094 } 2095 splx(s); 2096 } 2097 2098 /* 2099 * If all I/Os have been disposed of, then we can 2100 * return. 2101 */ 2102 if (found == nentqueued) 2103 return (runningcode); 2104 2105 ki->kaio_flags |= KAIO_WAKEUP; 2106 error = tsleep(p, PRIBIO | PCATCH, "aiospn", 0); 2107 2108 if (error == EINTR) 2109 return (EINTR); 2110 else if (error == EWOULDBLOCK) 2111 return (EAGAIN); 2112 } 2113 } 2114 2115 return (runningcode); 2116 } 2117 2118 /* 2119 * Interrupt handler for physio, performs the necessary process wakeups, and 2120 * signals. 2121 */ 2122 static void 2123 aio_physwakeup(struct buf *bp) 2124 { 2125 struct aiocblist *aiocbe; 2126 struct proc *p; 2127 struct kaioinfo *ki; 2128 struct aio_liojob *lj; 2129 2130 mtx_lock(&Giant); 2131 bp->b_flags |= B_DONE; 2132 wakeup(bp); 2133 2134 aiocbe = (struct aiocblist *)bp->b_caller1; 2135 if (aiocbe) { 2136 p = aiocbe->userproc; 2137 2138 aiocbe->jobstate = JOBST_JOBBFINISHED; 2139 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; 2140 aiocbe->uaiocb._aiocb_private.error = 0; 2141 aiocbe->jobflags |= AIOCBLIST_DONE; 2142 2143 if (bp->b_ioflags & BIO_ERROR) 2144 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 2145 2146 lj = aiocbe->lio; 2147 if (lj) { 2148 lj->lioj_buffer_finished_count++; 2149 2150 /* 2151 * wakeup/signal if all of the interrupt jobs are done. 2152 */ 2153 if (lj->lioj_buffer_finished_count == 2154 lj->lioj_buffer_count && 2155 lj->lioj_queue_finished_count == 2156 lj->lioj_queue_count) { 2157 /* 2158 * Post a signal if it is called for. 2159 */ 2160 if ((lj->lioj_flags & 2161 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == 2162 LIOJ_SIGNAL) { 2163 PROC_LOCK(p); 2164 psignal(p, lj->lioj_signal.sigev_signo); 2165 PROC_UNLOCK(p); 2166 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2167 } 2168 } 2169 } 2170 2171 ki = p->p_aioinfo; 2172 if (ki) { 2173 ki->kaio_buffer_finished_count++; 2174 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 2175 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 2176 2177 KNOTE_UNLOCKED(&aiocbe->klist, 0); 2178 /* Do the wakeup. */ 2179 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) { 2180 ki->kaio_flags &= ~KAIO_WAKEUP; 2181 wakeup(p); 2182 } 2183 } 2184 2185 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 2186 PROC_LOCK(p); 2187 psignal(p, aiocbe->uaiocb.aio_sigevent.sigev_signo); 2188 PROC_UNLOCK(p); 2189 } 2190 } 2191 mtx_unlock(&Giant); 2192 } 2193 2194 /* syscall - wait for the next completion of an aio request */ 2195 int 2196 aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap) 2197 { 2198 struct proc *p = td->td_proc; 2199 struct timeval atv; 2200 struct timespec ts; 2201 struct kaioinfo *ki; 2202 struct aiocblist *cb = NULL; 2203 int error, s, timo; 2204 2205 suword(uap->aiocbp, (int)NULL); 2206 2207 timo = 0; 2208 if (uap->timeout) { 2209 /* Get timespec struct. */ 2210 error = copyin(uap->timeout, &ts, sizeof(ts)); 2211 if (error) 2212 return (error); 2213 2214 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000)) 2215 return (EINVAL); 2216 2217 TIMESPEC_TO_TIMEVAL(&atv, &ts); 2218 if (itimerfix(&atv)) 2219 return (EINVAL); 2220 timo = tvtohz(&atv); 2221 } 2222 2223 ki = p->p_aioinfo; 2224 if (ki == NULL) 2225 return (EAGAIN); 2226 2227 for (;;) { 2228 PROC_LOCK(p); 2229 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) { 2230 PROC_UNLOCK(p); 2231 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2232 td->td_retval[0] = cb->uaiocb._aiocb_private.status; 2233 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 2234 p->p_stats->p_ru.ru_oublock += 2235 cb->outputcharge; 2236 cb->outputcharge = 0; 2237 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 2238 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 2239 cb->inputcharge = 0; 2240 } 2241 error = cb->uaiocb._aiocb_private.error; 2242 aio_free_entry(cb); 2243 return (error); 2244 } 2245 2246 s = splbio(); 2247 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) { 2248 PROC_UNLOCK(p); 2249 splx(s); 2250 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2251 error = cb->uaiocb._aiocb_private.error; 2252 td->td_retval[0] = cb->uaiocb._aiocb_private.status; 2253 aio_free_entry(cb); 2254 return (error); 2255 } 2256 2257 ki->kaio_flags |= KAIO_WAKEUP; 2258 error = msleep(p, &p->p_mtx, PDROP | PRIBIO | PCATCH, "aiowc", 2259 timo); 2260 splx(s); 2261 2262 if (error == ERESTART) 2263 return (EINTR); 2264 else if (error < 0) 2265 return (error); 2266 else if (error == EINTR) 2267 return (EINTR); 2268 else if (error == EWOULDBLOCK) 2269 return (EAGAIN); 2270 } 2271 } 2272 2273 /* kqueue attach function */ 2274 static int 2275 filt_aioattach(struct knote *kn) 2276 { 2277 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2278 2279 /* 2280 * The aiocbe pointer must be validated before using it, so 2281 * registration is restricted to the kernel; the user cannot 2282 * set EV_FLAG1. 2283 */ 2284 if ((kn->kn_flags & EV_FLAG1) == 0) 2285 return (EPERM); 2286 kn->kn_flags &= ~EV_FLAG1; 2287 2288 knlist_add(&aiocbe->klist, kn, 0); 2289 2290 return (0); 2291 } 2292 2293 /* kqueue detach function */ 2294 static void 2295 filt_aiodetach(struct knote *kn) 2296 { 2297 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2298 2299 knlist_remove(&aiocbe->klist, kn, 0); 2300 } 2301 2302 /* kqueue filter function */ 2303 /*ARGSUSED*/ 2304 static int 2305 filt_aio(struct knote *kn, long hint) 2306 { 2307 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2308 2309 kn->kn_data = aiocbe->uaiocb._aiocb_private.error; 2310 if (aiocbe->jobstate != JOBST_JOBFINISHED && 2311 aiocbe->jobstate != JOBST_JOBBFINISHED) 2312 return (0); 2313 kn->kn_flags |= EV_EOF; 2314 return (1); 2315 }
Cache object: 32651ba7a1e336579d353c63b2582706
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