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 * $FreeBSD$ 17 */ 18 19 /* 20 * This file contains support for the POSIX 1003.1B AIO/LIO facility. 21 */ 22 23 #include <sys/param.h> 24 #include <sys/systm.h> 25 #include <sys/bio.h> 26 #include <sys/buf.h> 27 #include <sys/sysproto.h> 28 #include <sys/filedesc.h> 29 #include <sys/kernel.h> 30 #include <sys/kthread.h> 31 #include <sys/fcntl.h> 32 #include <sys/file.h> 33 #include <sys/lock.h> 34 #include <sys/mutex.h> 35 #include <sys/unistd.h> 36 #include <sys/proc.h> 37 #include <sys/resourcevar.h> 38 #include <sys/signalvar.h> 39 #include <sys/protosw.h> 40 #include <sys/socketvar.h> 41 #include <sys/syscall.h> 42 #include <sys/sysent.h> 43 #include <sys/sysctl.h> 44 #include <sys/vnode.h> 45 #include <sys/conf.h> 46 #include <sys/event.h> 47 48 #include <vm/vm.h> 49 #include <vm/vm_extern.h> 50 #include <vm/pmap.h> 51 #include <vm/vm_map.h> 52 #include <vm/vm_zone.h> 53 #include <sys/aio.h> 54 55 #include <machine/limits.h> 56 57 #include "opt_vfs_aio.h" 58 59 static long jobrefid; 60 61 #define JOBST_NULL 0x0 62 #define JOBST_JOBQPROC 0x1 63 #define JOBST_JOBQGLOBAL 0x2 64 #define JOBST_JOBRUNNING 0x3 65 #define JOBST_JOBFINISHED 0x4 66 #define JOBST_JOBQBUF 0x5 67 #define JOBST_JOBBFINISHED 0x6 68 69 #ifndef MAX_AIO_PER_PROC 70 #define MAX_AIO_PER_PROC 32 71 #endif 72 73 #ifndef MAX_AIO_QUEUE_PER_PROC 74 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */ 75 #endif 76 77 #ifndef MAX_AIO_PROCS 78 #define MAX_AIO_PROCS 32 79 #endif 80 81 #ifndef MAX_AIO_QUEUE 82 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */ 83 #endif 84 85 #ifndef TARGET_AIO_PROCS 86 #define TARGET_AIO_PROCS 4 87 #endif 88 89 #ifndef MAX_BUF_AIO 90 #define MAX_BUF_AIO 16 91 #endif 92 93 #ifndef AIOD_TIMEOUT_DEFAULT 94 #define AIOD_TIMEOUT_DEFAULT (10 * hz) 95 #endif 96 97 #ifndef AIOD_LIFETIME_DEFAULT 98 #define AIOD_LIFETIME_DEFAULT (30 * hz) 99 #endif 100 101 static int max_aio_procs = MAX_AIO_PROCS; 102 static int num_aio_procs = 0; 103 static int target_aio_procs = TARGET_AIO_PROCS; 104 static int max_queue_count = MAX_AIO_QUEUE; 105 static int num_queue_count = 0; 106 static int num_buf_aio = 0; 107 static int num_aio_resv_start = 0; 108 static int aiod_timeout; 109 static int aiod_lifetime; 110 static int unloadable = 0; 111 112 static int max_aio_per_proc = MAX_AIO_PER_PROC; 113 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 114 static int max_buf_aio = MAX_BUF_AIO; 115 116 SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "AIO mgmt"); 117 118 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, 119 CTLFLAG_RW, &max_aio_per_proc, 0, ""); 120 121 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, 122 CTLFLAG_RW, &max_aio_queue_per_proc, 0, ""); 123 124 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, 125 CTLFLAG_RW, &max_aio_procs, 0, ""); 126 127 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, 128 CTLFLAG_RD, &num_aio_procs, 0, ""); 129 130 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, 131 CTLFLAG_RD, &num_queue_count, 0, ""); 132 133 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, 134 CTLFLAG_RW, &max_queue_count, 0, ""); 135 136 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, 137 CTLFLAG_RW, &target_aio_procs, 0, ""); 138 139 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, 140 CTLFLAG_RW, &max_buf_aio, 0, ""); 141 142 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, 143 CTLFLAG_RD, &num_buf_aio, 0, ""); 144 145 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, 146 CTLFLAG_RW, &aiod_lifetime, 0, ""); 147 148 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, 149 CTLFLAG_RW, &aiod_timeout, 0, ""); 150 151 SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0, 152 "Allow unload of aio (not recommended)"); 153 154 struct aiocblist { 155 TAILQ_ENTRY(aiocblist) list; /* List of jobs */ 156 TAILQ_ENTRY(aiocblist) plist; /* List of jobs for proc */ 157 int jobflags; 158 int jobstate; 159 int inputcharge; 160 int outputcharge; 161 struct callout_handle timeouthandle; 162 struct buf *bp; /* Buffer pointer */ 163 struct proc *userproc; /* User process */ /* Not td! */ 164 struct file *fd_file; /* Pointer to file structure */ 165 struct aiothreadlist *jobaiothread; /* AIO process descriptor */ 166 struct aio_liojob *lio; /* Optional lio job */ 167 struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */ 168 struct klist klist; /* list of knotes */ 169 struct aiocb uaiocb; /* Kernel I/O control block */ 170 }; 171 172 /* jobflags */ 173 #define AIOCBLIST_RUNDOWN 0x4 174 #define AIOCBLIST_ASYNCFREE 0x8 175 #define AIOCBLIST_DONE 0x10 176 177 /* 178 * AIO process info 179 */ 180 #define AIOP_FREE 0x1 /* proc on free queue */ 181 #define AIOP_SCHED 0x2 /* proc explicitly scheduled */ 182 183 struct aiothreadlist { 184 int aiothreadflags; /* AIO proc flags */ 185 TAILQ_ENTRY(aiothreadlist) list; /* List of processes */ 186 struct thread *aiothread; /* The AIO thread */ 187 TAILQ_HEAD(,aiocblist) jobtorun; /* suggested job to run */ 188 }; 189 190 /* 191 * data-structure for lio signal management 192 */ 193 struct aio_liojob { 194 int lioj_flags; 195 int lioj_buffer_count; 196 int lioj_buffer_finished_count; 197 int lioj_queue_count; 198 int lioj_queue_finished_count; 199 struct sigevent lioj_signal; /* signal on all I/O done */ 200 TAILQ_ENTRY(aio_liojob) lioj_list; 201 struct kaioinfo *lioj_ki; 202 }; 203 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ 204 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ 205 206 /* 207 * per process aio data structure 208 */ 209 struct kaioinfo { 210 int kaio_flags; /* per process kaio flags */ 211 int kaio_maxactive_count; /* maximum number of AIOs */ 212 int kaio_active_count; /* number of currently used AIOs */ 213 int kaio_qallowed_count; /* maxiumu size of AIO queue */ 214 int kaio_queue_count; /* size of AIO queue */ 215 int kaio_ballowed_count; /* maximum number of buffers */ 216 int kaio_queue_finished_count; /* number of daemon jobs finished */ 217 int kaio_buffer_count; /* number of physio buffers */ 218 int kaio_buffer_finished_count; /* count of I/O done */ 219 struct proc *kaio_p; /* process that uses this kaio block */ 220 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */ 221 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */ 222 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */ 223 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */ 224 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */ 225 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */ 226 }; 227 228 #define KAIO_RUNDOWN 0x1 /* process is being run down */ 229 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ 230 231 static TAILQ_HEAD(,aiothreadlist) aio_freeproc, aio_activeproc; 232 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */ 233 static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */ 234 235 static void aio_init_aioinfo(struct proc *p); 236 static void aio_onceonly(void); 237 static int aio_free_entry(struct aiocblist *aiocbe); 238 static void aio_process(struct aiocblist *aiocbe); 239 static int aio_newproc(void); 240 static int aio_aqueue(struct thread *td, struct aiocb *job, int type); 241 static void aio_physwakeup(struct buf *bp); 242 static void aio_proc_rundown(struct proc *p); 243 static int aio_fphysio(struct proc *p, struct aiocblist *aiocbe); 244 static int aio_qphysio(struct proc *p, struct aiocblist *iocb); 245 static void aio_daemon(void *uproc); 246 static void aio_swake_cb(struct socket *, struct sockbuf *); 247 static int aio_unload(void); 248 static void process_signal(void *aioj); 249 static int filt_aioattach(struct knote *kn); 250 static void filt_aiodetach(struct knote *kn); 251 static int filt_aio(struct knote *kn, long hint); 252 253 static vm_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone; 254 static vm_zone_t aiolio_zone; 255 256 static struct filterops aio_filtops = 257 { 0, filt_aioattach, filt_aiodetach, filt_aio }; 258 259 static int 260 aio_modload(struct module *module, int cmd, void *arg) 261 { 262 int error = 0; 263 264 switch (cmd) { 265 case MOD_LOAD: 266 aio_onceonly(); 267 break; 268 case MOD_UNLOAD: 269 error = aio_unload(); 270 break; 271 case MOD_SHUTDOWN: 272 break; 273 default: 274 error = EINVAL; 275 break; 276 } 277 return (error); 278 } 279 280 static moduledata_t aio_mod = { 281 "aio", 282 &aio_modload, 283 NULL 284 }; 285 286 SYSCALL_MODULE_HELPER(aio_return); 287 SYSCALL_MODULE_HELPER(aio_suspend); 288 SYSCALL_MODULE_HELPER(aio_cancel); 289 SYSCALL_MODULE_HELPER(aio_error); 290 SYSCALL_MODULE_HELPER(aio_read); 291 SYSCALL_MODULE_HELPER(aio_write); 292 SYSCALL_MODULE_HELPER(aio_waitcomplete); 293 SYSCALL_MODULE_HELPER(lio_listio); 294 295 DECLARE_MODULE(aio, aio_mod, 296 SI_SUB_VFS, SI_ORDER_ANY); 297 MODULE_VERSION(aio, 1); 298 299 /* 300 * Startup initialization 301 */ 302 static void 303 aio_onceonly(void) 304 { 305 306 /* XXX: should probably just use so->callback */ 307 aio_swake = &aio_swake_cb; 308 at_exit(aio_proc_rundown); 309 at_exec(aio_proc_rundown); 310 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops); 311 TAILQ_INIT(&aio_freeproc); 312 TAILQ_INIT(&aio_activeproc); 313 TAILQ_INIT(&aio_jobs); 314 TAILQ_INIT(&aio_bufjobs); 315 kaio_zone = zinit("AIO", sizeof(struct kaioinfo), 0, 0, 1); 316 aiop_zone = zinit("AIOP", sizeof(struct aiothreadlist), 0, 0, 1); 317 aiocb_zone = zinit("AIOCB", sizeof(struct aiocblist), 0, 0, 1); 318 aiol_zone = zinit("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t), 0, 0, 1); 319 aiolio_zone = zinit("AIOLIO", AIO_LISTIO_MAX * sizeof(struct 320 aio_liojob), 0, 0, 1); 321 aiod_timeout = AIOD_TIMEOUT_DEFAULT; 322 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 323 jobrefid = 1; 324 } 325 326 static int 327 aio_unload(void) 328 { 329 330 /* 331 * XXX: no unloads by default, it's too dangerous. 332 * perhaps we could do it if locked out callers and then 333 * did an aio_proc_rundown() on each process. 334 */ 335 if (!unloadable) 336 return (EOPNOTSUPP); 337 338 aio_swake = NULL; 339 rm_at_exit(aio_proc_rundown); 340 rm_at_exec(aio_proc_rundown); 341 kqueue_del_filteropts(EVFILT_AIO); 342 return (0); 343 } 344 345 /* 346 * Init the per-process aioinfo structure. The aioinfo limits are set 347 * per-process for user limit (resource) management. 348 */ 349 static void 350 aio_init_aioinfo(struct proc *p) 351 { 352 struct kaioinfo *ki; 353 if (p->p_aioinfo == NULL) { 354 ki = zalloc(kaio_zone); 355 p->p_aioinfo = ki; 356 ki->kaio_flags = 0; 357 ki->kaio_maxactive_count = max_aio_per_proc; 358 ki->kaio_active_count = 0; 359 ki->kaio_qallowed_count = max_aio_queue_per_proc; 360 ki->kaio_queue_count = 0; 361 ki->kaio_ballowed_count = max_buf_aio; 362 ki->kaio_buffer_count = 0; 363 ki->kaio_buffer_finished_count = 0; 364 ki->kaio_p = p; 365 TAILQ_INIT(&ki->kaio_jobdone); 366 TAILQ_INIT(&ki->kaio_jobqueue); 367 TAILQ_INIT(&ki->kaio_bufdone); 368 TAILQ_INIT(&ki->kaio_bufqueue); 369 TAILQ_INIT(&ki->kaio_liojoblist); 370 TAILQ_INIT(&ki->kaio_sockqueue); 371 } 372 373 while (num_aio_procs < target_aio_procs) 374 aio_newproc(); 375 } 376 377 /* 378 * Free a job entry. Wait for completion if it is currently active, but don't 379 * delay forever. If we delay, we return a flag that says that we have to 380 * restart the queue scan. 381 */ 382 static int 383 aio_free_entry(struct aiocblist *aiocbe) 384 { 385 struct kaioinfo *ki; 386 struct aiothreadlist *aiop; 387 struct aio_liojob *lj; 388 struct proc *p; 389 int error; 390 int s; 391 392 if (aiocbe->jobstate == JOBST_NULL) 393 panic("aio_free_entry: freeing already free job"); 394 395 p = aiocbe->userproc; 396 ki = p->p_aioinfo; 397 lj = aiocbe->lio; 398 if (ki == NULL) 399 panic("aio_free_entry: missing p->p_aioinfo"); 400 401 while (aiocbe->jobstate == JOBST_JOBRUNNING) { 402 if (aiocbe->jobflags & AIOCBLIST_ASYNCFREE) 403 return 0; 404 aiocbe->jobflags |= AIOCBLIST_RUNDOWN; 405 tsleep(aiocbe, PRIBIO, "jobwai", 0); 406 } 407 aiocbe->jobflags &= ~AIOCBLIST_ASYNCFREE; 408 409 if (aiocbe->bp == NULL) { 410 if (ki->kaio_queue_count <= 0) 411 panic("aio_free_entry: process queue size <= 0"); 412 if (num_queue_count <= 0) 413 panic("aio_free_entry: system wide queue size <= 0"); 414 415 if (lj) { 416 lj->lioj_queue_count--; 417 if (aiocbe->jobflags & AIOCBLIST_DONE) 418 lj->lioj_queue_finished_count--; 419 } 420 ki->kaio_queue_count--; 421 if (aiocbe->jobflags & AIOCBLIST_DONE) 422 ki->kaio_queue_finished_count--; 423 num_queue_count--; 424 } else { 425 if (lj) { 426 lj->lioj_buffer_count--; 427 if (aiocbe->jobflags & AIOCBLIST_DONE) 428 lj->lioj_buffer_finished_count--; 429 } 430 if (aiocbe->jobflags & AIOCBLIST_DONE) 431 ki->kaio_buffer_finished_count--; 432 ki->kaio_buffer_count--; 433 num_buf_aio--; 434 } 435 436 /* aiocbe is going away, we need to destroy any knotes */ 437 knote_remove(&p->p_thread, &aiocbe->klist); /* XXXKSE */ 438 /* XXXKSE Note the thread here is used to eventually find the 439 * owning process again, but it is also used to do a fo_close 440 * and that requires the thread. (but does it require the 441 * OWNING thread? (or maby the running thread?) 442 * There is a semantic problem here... 443 */ 444 445 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN) 446 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) { 447 ki->kaio_flags &= ~KAIO_WAKEUP; 448 wakeup(p); 449 } 450 451 if (aiocbe->jobstate == JOBST_JOBQBUF) { 452 if ((error = aio_fphysio(p, aiocbe)) != 0) 453 return error; 454 if (aiocbe->jobstate != JOBST_JOBBFINISHED) 455 panic("aio_free_entry: invalid physio finish-up state"); 456 s = splbio(); 457 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 458 splx(s); 459 } else if (aiocbe->jobstate == JOBST_JOBQPROC) { 460 aiop = aiocbe->jobaiothread; 461 TAILQ_REMOVE(&aiop->jobtorun, aiocbe, list); 462 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) { 463 s = splnet(); 464 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 465 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 466 splx(s); 467 } else if (aiocbe->jobstate == JOBST_JOBFINISHED) 468 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist); 469 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) { 470 s = splbio(); 471 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 472 splx(s); 473 if (aiocbe->bp) { 474 vunmapbuf(aiocbe->bp); 475 relpbuf(aiocbe->bp, NULL); 476 aiocbe->bp = NULL; 477 } 478 } 479 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) { 480 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 481 zfree(aiolio_zone, lj); 482 } 483 aiocbe->jobstate = JOBST_NULL; 484 untimeout(process_signal, aiocbe, aiocbe->timeouthandle); 485 zfree(aiocb_zone, aiocbe); 486 return 0; 487 } 488 489 /* 490 * Rundown the jobs for a given process. 491 */ 492 static void 493 aio_proc_rundown(struct proc *p) 494 { 495 int s; 496 struct kaioinfo *ki; 497 struct aio_liojob *lj, *ljn; 498 struct aiocblist *aiocbe, *aiocbn; 499 struct file *fp; 500 struct filedesc *fdp; 501 struct socket *so; 502 503 ki = p->p_aioinfo; 504 if (ki == NULL) 505 return; 506 507 ki->kaio_flags |= LIOJ_SIGNAL_POSTED; 508 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count > 509 ki->kaio_buffer_finished_count)) { 510 ki->kaio_flags |= KAIO_RUNDOWN; 511 if (tsleep(p, PRIBIO, "kaiowt", aiod_timeout)) 512 break; 513 } 514 515 /* 516 * Move any aio ops that are waiting on socket I/O to the normal job 517 * queues so they are cleaned up with any others. 518 */ 519 fdp = p->p_fd; 520 521 s = splnet(); 522 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe = 523 aiocbn) { 524 aiocbn = TAILQ_NEXT(aiocbe, plist); 525 fp = fdp->fd_ofiles[aiocbe->uaiocb.aio_fildes]; 526 527 /* 528 * Under some circumstances, the aio_fildes and the file 529 * structure don't match. This would leave aiocbe's in the 530 * TAILQ associated with the socket and cause a panic later. 531 * 532 * Detect and fix. 533 */ 534 if ((fp == NULL) || (fp != aiocbe->fd_file)) 535 fp = aiocbe->fd_file; 536 if (fp) { 537 so = (struct socket *)fp->f_data; 538 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list); 539 if (TAILQ_EMPTY(&so->so_aiojobq)) { 540 so->so_snd.sb_flags &= ~SB_AIO; 541 so->so_rcv.sb_flags &= ~SB_AIO; 542 } 543 } 544 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist); 545 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list); 546 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist); 547 } 548 splx(s); 549 550 restart1: 551 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) { 552 aiocbn = TAILQ_NEXT(aiocbe, plist); 553 if (aio_free_entry(aiocbe)) 554 goto restart1; 555 } 556 557 restart2: 558 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe = 559 aiocbn) { 560 aiocbn = TAILQ_NEXT(aiocbe, plist); 561 if (aio_free_entry(aiocbe)) 562 goto restart2; 563 } 564 565 /* 566 * Note the use of lots of splbio here, trying to avoid splbio for long chains 567 * of I/O. Probably unnecessary. 568 */ 569 restart3: 570 s = splbio(); 571 while (TAILQ_FIRST(&ki->kaio_bufqueue)) { 572 ki->kaio_flags |= KAIO_WAKEUP; 573 tsleep(p, PRIBIO, "aioprn", 0); 574 splx(s); 575 goto restart3; 576 } 577 splx(s); 578 579 restart4: 580 s = splbio(); 581 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) { 582 aiocbn = TAILQ_NEXT(aiocbe, plist); 583 if (aio_free_entry(aiocbe)) { 584 splx(s); 585 goto restart4; 586 } 587 } 588 splx(s); 589 590 /* 591 * If we've slept, jobs might have moved from one queue to another. 592 * Retry rundown if we didn't manage to empty the queues. 593 */ 594 if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL || 595 TAILQ_FIRST(&ki->kaio_jobqueue) != NULL || 596 TAILQ_FIRST(&ki->kaio_bufqueue) != NULL || 597 TAILQ_FIRST(&ki->kaio_bufdone) != NULL) 598 goto restart1; 599 600 for (lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) { 601 ljn = TAILQ_NEXT(lj, lioj_list); 602 if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 603 0)) { 604 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 605 zfree(aiolio_zone, lj); 606 } else { 607 #ifdef DIAGNOSTIC 608 printf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, " 609 "QF:%d\n", lj->lioj_buffer_count, 610 lj->lioj_buffer_finished_count, 611 lj->lioj_queue_count, 612 lj->lioj_queue_finished_count); 613 #endif 614 } 615 } 616 617 zfree(kaio_zone, ki); 618 p->p_aioinfo = NULL; 619 } 620 621 /* 622 * Select a job to run (called by an AIO daemon). 623 */ 624 static struct aiocblist * 625 aio_selectjob(struct aiothreadlist *aiop) 626 { 627 int s; 628 struct aiocblist *aiocbe; 629 struct kaioinfo *ki; 630 struct proc *userp; 631 632 aiocbe = TAILQ_FIRST(&aiop->jobtorun); 633 if (aiocbe) { 634 TAILQ_REMOVE(&aiop->jobtorun, aiocbe, list); 635 return aiocbe; 636 } 637 638 s = splnet(); 639 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe = 640 TAILQ_NEXT(aiocbe, list)) { 641 userp = aiocbe->userproc; 642 ki = userp->p_aioinfo; 643 644 if (ki->kaio_active_count < ki->kaio_maxactive_count) { 645 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 646 splx(s); 647 return aiocbe; 648 } 649 } 650 splx(s); 651 652 return NULL; 653 } 654 655 /* 656 * The AIO processing activity. This is the code that does the I/O request for 657 * the non-physio version of the operations. The normal vn operations are used, 658 * and this code should work in all instances for every type of file, including 659 * pipes, sockets, fifos, and regular files. 660 */ 661 static void 662 aio_process(struct aiocblist *aiocbe) 663 { 664 struct filedesc *fdp; 665 struct thread *td; 666 struct proc *userp; 667 struct proc *mycp; 668 struct aiocb *cb; 669 struct file *fp; 670 struct uio auio; 671 struct iovec aiov; 672 unsigned int fd; 673 int cnt; 674 int error; 675 off_t offset; 676 int oublock_st, oublock_end; 677 int inblock_st, inblock_end; 678 679 userp = aiocbe->userproc; 680 td = curthread; 681 mycp = td->td_proc; 682 cb = &aiocbe->uaiocb; 683 684 fdp = mycp->p_fd; 685 fd = cb->aio_fildes; 686 fp = fdp->fd_ofiles[fd]; 687 688 if ((fp == NULL) || (fp != aiocbe->fd_file)) { 689 cb->_aiocb_private.error = EBADF; 690 cb->_aiocb_private.status = -1; 691 return; 692 } 693 694 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; 695 aiov.iov_len = cb->aio_nbytes; 696 697 auio.uio_iov = &aiov; 698 auio.uio_iovcnt = 1; 699 auio.uio_offset = offset = cb->aio_offset; 700 auio.uio_resid = cb->aio_nbytes; 701 cnt = cb->aio_nbytes; 702 auio.uio_segflg = UIO_USERSPACE; 703 auio.uio_td = td; 704 705 inblock_st = mycp->p_stats->p_ru.ru_inblock; 706 oublock_st = mycp->p_stats->p_ru.ru_oublock; 707 /* 708 * Temporarily bump the ref count while reading to avoid the 709 * descriptor being ripped out from under us. 710 */ 711 fhold(fp); 712 if (cb->aio_lio_opcode == LIO_READ) { 713 auio.uio_rw = UIO_READ; 714 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td); 715 } else { 716 auio.uio_rw = UIO_WRITE; 717 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td); 718 } 719 fdrop(fp, td); 720 inblock_end = mycp->p_stats->p_ru.ru_inblock; 721 oublock_end = mycp->p_stats->p_ru.ru_oublock; 722 723 aiocbe->inputcharge = inblock_end - inblock_st; 724 aiocbe->outputcharge = oublock_end - oublock_st; 725 726 if ((error) && (auio.uio_resid != cnt)) { 727 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 728 error = 0; 729 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) { 730 PROC_LOCK(userp); 731 psignal(userp, SIGPIPE); 732 PROC_UNLOCK(userp); 733 } 734 } 735 736 cnt -= auio.uio_resid; 737 cb->_aiocb_private.error = error; 738 cb->_aiocb_private.status = cnt; 739 } 740 741 /* 742 * The AIO daemon, most of the actual work is done in aio_process, 743 * but the setup (and address space mgmt) is done in this routine. 744 */ 745 static void 746 aio_daemon(void *uproc) 747 { 748 int s; 749 struct aio_liojob *lj; 750 struct aiocb *cb; 751 struct aiocblist *aiocbe; 752 struct aiothreadlist *aiop; 753 struct kaioinfo *ki; 754 struct proc *curcp, *mycp, *userp; 755 struct vmspace *myvm, *tmpvm; 756 struct thread *td = curthread; 757 758 mtx_lock(&Giant); 759 /* 760 * Local copies of curproc (cp) and vmspace (myvm) 761 */ 762 mycp = td->td_proc; 763 myvm = mycp->p_vmspace; 764 765 if (mycp->p_textvp) { 766 vrele(mycp->p_textvp); 767 mycp->p_textvp = NULL; 768 } 769 770 /* 771 * Allocate and ready the aio control info. There is one aiop structure 772 * per daemon. 773 */ 774 aiop = zalloc(aiop_zone); 775 aiop->aiothread = td; 776 aiop->aiothreadflags |= AIOP_FREE; 777 TAILQ_INIT(&aiop->jobtorun); 778 779 s = splnet(); 780 781 /* 782 * Place thread (lightweight process) onto the AIO free thread list. 783 */ 784 if (TAILQ_EMPTY(&aio_freeproc)) 785 wakeup(&aio_freeproc); 786 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 787 788 splx(s); 789 790 /* 791 * Get rid of our current filedescriptors. AIOD's don't need any 792 * filedescriptors, except as temporarily inherited from the client. 793 */ 794 fdfree(td); 795 mycp->p_fd = NULL; 796 797 /* The daemon resides in its own pgrp. */ 798 enterpgrp(mycp, mycp->p_pid, 1); 799 800 /* Mark special process type. */ 801 mycp->p_flag |= P_SYSTEM; 802 803 /* 804 * Wakeup parent process. (Parent sleeps to keep from blasting away 805 * and creating too many daemons.) 806 */ 807 wakeup(mycp); 808 809 for (;;) { 810 /* 811 * curcp is the current daemon process context. 812 * userp is the current user process context. 813 */ 814 curcp = mycp; 815 816 /* 817 * Take daemon off of free queue 818 */ 819 if (aiop->aiothreadflags & AIOP_FREE) { 820 s = splnet(); 821 TAILQ_REMOVE(&aio_freeproc, aiop, list); 822 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 823 aiop->aiothreadflags &= ~AIOP_FREE; 824 splx(s); 825 } 826 aiop->aiothreadflags &= ~AIOP_SCHED; 827 828 /* 829 * Check for jobs. 830 */ 831 while ((aiocbe = aio_selectjob(aiop)) != NULL) { 832 cb = &aiocbe->uaiocb; 833 userp = aiocbe->userproc; 834 835 aiocbe->jobstate = JOBST_JOBRUNNING; 836 837 /* 838 * Connect to process address space for user program. 839 */ 840 if (userp != curcp) { 841 /* 842 * Save the current address space that we are 843 * connected to. 844 */ 845 tmpvm = mycp->p_vmspace; 846 847 /* 848 * Point to the new user address space, and 849 * refer to it. 850 */ 851 mycp->p_vmspace = userp->p_vmspace; 852 mycp->p_vmspace->vm_refcnt++; 853 854 /* Activate the new mapping. */ 855 pmap_activate(&mycp->p_thread); 856 857 /* 858 * If the old address space wasn't the daemons 859 * own address space, then we need to remove the 860 * daemon's reference from the other process 861 * that it was acting on behalf of. 862 */ 863 if (tmpvm != myvm) { 864 vmspace_free(tmpvm); 865 } 866 867 /* 868 * Disassociate from previous clients file 869 * descriptors, and associate to the new clients 870 * descriptors. Note that the daemon doesn't 871 * need to worry about its orginal descriptors, 872 * because they were originally freed. 873 */ 874 if (mycp->p_fd) 875 fdfree(td); 876 mycp->p_fd = fdshare(userp); 877 curcp = userp; 878 } 879 880 ki = userp->p_aioinfo; 881 lj = aiocbe->lio; 882 883 /* Account for currently active jobs. */ 884 ki->kaio_active_count++; 885 886 /* Do the I/O function. */ 887 aiocbe->jobaiothread = aiop; 888 aio_process(aiocbe); 889 890 /* Decrement the active job count. */ 891 ki->kaio_active_count--; 892 893 /* 894 * Increment the completion count for wakeup/signal 895 * comparisons. 896 */ 897 aiocbe->jobflags |= AIOCBLIST_DONE; 898 ki->kaio_queue_finished_count++; 899 if (lj) 900 lj->lioj_queue_finished_count++; 901 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags 902 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) { 903 ki->kaio_flags &= ~KAIO_WAKEUP; 904 wakeup(userp); 905 } 906 907 s = splbio(); 908 if (lj && (lj->lioj_flags & 909 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) { 910 if ((lj->lioj_queue_finished_count == 911 lj->lioj_queue_count) && 912 (lj->lioj_buffer_finished_count == 913 lj->lioj_buffer_count)) { 914 PROC_LOCK(userp); 915 psignal(userp, 916 lj->lioj_signal.sigev_signo); 917 PROC_UNLOCK(userp); 918 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 919 } 920 } 921 splx(s); 922 923 aiocbe->jobstate = JOBST_JOBFINISHED; 924 925 /* 926 * If the I/O request should be automatically rundown, 927 * do the needed cleanup. Otherwise, place the queue 928 * entry for the just finished I/O request into the done 929 * queue for the associated client. 930 */ 931 s = splnet(); 932 if (aiocbe->jobflags & AIOCBLIST_ASYNCFREE) { 933 aiocbe->jobflags &= ~AIOCBLIST_ASYNCFREE; 934 zfree(aiocb_zone, aiocbe); 935 } else { 936 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 937 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, 938 plist); 939 } 940 splx(s); 941 KNOTE(&aiocbe->klist, 0); 942 943 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) { 944 wakeup(aiocbe); 945 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN; 946 } 947 948 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 949 PROC_LOCK(userp); 950 psignal(userp, cb->aio_sigevent.sigev_signo); 951 PROC_UNLOCK(userp); 952 } 953 } 954 955 /* 956 * Disconnect from user address space. 957 */ 958 if (curcp != mycp) { 959 /* Get the user address space to disconnect from. */ 960 tmpvm = mycp->p_vmspace; 961 962 /* Get original address space for daemon. */ 963 mycp->p_vmspace = myvm; 964 965 /* Activate the daemon's address space. */ 966 pmap_activate(&mycp->p_thread); 967 #ifdef DIAGNOSTIC 968 if (tmpvm == myvm) { 969 printf("AIOD: vmspace problem -- %d\n", 970 mycp->p_pid); 971 } 972 #endif 973 /* Remove our vmspace reference. */ 974 vmspace_free(tmpvm); 975 976 /* 977 * Disassociate from the user process's file 978 * descriptors. 979 */ 980 if (mycp->p_fd) 981 fdfree(td); 982 mycp->p_fd = NULL; 983 curcp = mycp; 984 } 985 986 /* 987 * If we are the first to be put onto the free queue, wakeup 988 * anyone waiting for a daemon. 989 */ 990 s = splnet(); 991 TAILQ_REMOVE(&aio_activeproc, aiop, list); 992 if (TAILQ_EMPTY(&aio_freeproc)) 993 wakeup(&aio_freeproc); 994 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 995 aiop->aiothreadflags |= AIOP_FREE; 996 splx(s); 997 998 /* 999 * If daemon is inactive for a long time, allow it to exit, 1000 * thereby freeing resources. 1001 */ 1002 if (((aiop->aiothreadflags & AIOP_SCHED) == 0) && tsleep(mycp, 1003 PRIBIO, "aiordy", aiod_lifetime)) { 1004 s = splnet(); 1005 if ((TAILQ_FIRST(&aio_jobs) == NULL) && 1006 (TAILQ_FIRST(&aiop->jobtorun) == NULL)) { 1007 if ((aiop->aiothreadflags & AIOP_FREE) && 1008 (num_aio_procs > target_aio_procs)) { 1009 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1010 splx(s); 1011 zfree(aiop_zone, aiop); 1012 num_aio_procs--; 1013 #ifdef DIAGNOSTIC 1014 if (mycp->p_vmspace->vm_refcnt <= 1) { 1015 printf("AIOD: bad vm refcnt for" 1016 " exiting daemon: %d\n", 1017 mycp->p_vmspace->vm_refcnt); 1018 } 1019 #endif 1020 kthread_exit(0); 1021 } 1022 } 1023 splx(s); 1024 } 1025 } 1026 } 1027 1028 /* 1029 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 1030 * AIO daemon modifies its environment itself. 1031 */ 1032 static int 1033 aio_newproc() 1034 { 1035 int error; 1036 struct proc *p; 1037 1038 error = kthread_create(aio_daemon, curproc, &p, RFNOWAIT, "aiod%d", 1039 num_aio_procs); 1040 if (error) 1041 return error; 1042 1043 /* 1044 * Wait until daemon is started, but continue on just in case to 1045 * handle error conditions. 1046 */ 1047 error = tsleep(p, PZERO, "aiosta", aiod_timeout); 1048 1049 num_aio_procs++; 1050 1051 return error; 1052 } 1053 1054 /* 1055 * Try the high-performance, low-overhead physio method for eligible 1056 * VCHR devices. This method doesn't use an aio helper thread, and 1057 * thus has very low overhead. 1058 * 1059 * Assumes that the caller, _aio_aqueue(), has incremented the file 1060 * structure's reference count, preventing its deallocation for the 1061 * duration of this call. 1062 */ 1063 static int 1064 aio_qphysio(struct proc *p, struct aiocblist *aiocbe) 1065 { 1066 int error; 1067 struct aiocb *cb; 1068 struct file *fp; 1069 struct buf *bp; 1070 struct vnode *vp; 1071 struct kaioinfo *ki; 1072 struct filedesc *fdp; 1073 struct aio_liojob *lj; 1074 int fd; 1075 int s; 1076 int notify; 1077 1078 cb = &aiocbe->uaiocb; 1079 fdp = p->p_fd; 1080 fd = cb->aio_fildes; 1081 fp = fdp->fd_ofiles[fd]; 1082 1083 if (fp->f_type != DTYPE_VNODE) 1084 return (-1); 1085 1086 vp = (struct vnode *)fp->f_data; 1087 1088 /* 1089 * If its not a disk, we don't want to return a positive error. 1090 * It causes the aio code to not fall through to try the thread 1091 * way when you're talking to a regular file. 1092 */ 1093 if (!vn_isdisk(vp, &error)) { 1094 if (error == ENOTBLK) 1095 return (-1); 1096 else 1097 return (error); 1098 } 1099 1100 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys) 1101 return (-1); 1102 1103 if (cb->aio_nbytes > 1104 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK)) 1105 return (-1); 1106 1107 ki = p->p_aioinfo; 1108 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) 1109 return (-1); 1110 1111 ki->kaio_buffer_count++; 1112 1113 lj = aiocbe->lio; 1114 if (lj) 1115 lj->lioj_buffer_count++; 1116 1117 /* Create and build a buffer header for a transfer. */ 1118 bp = (struct buf *)getpbuf(NULL); 1119 BUF_KERNPROC(bp); 1120 1121 /* 1122 * Get a copy of the kva from the physical buffer. 1123 */ 1124 bp->b_caller1 = p; 1125 bp->b_dev = vp->v_rdev; 1126 error = bp->b_error = 0; 1127 1128 bp->b_bcount = cb->aio_nbytes; 1129 bp->b_bufsize = cb->aio_nbytes; 1130 bp->b_flags = B_PHYS; 1131 bp->b_iodone = aio_physwakeup; 1132 bp->b_saveaddr = bp->b_data; 1133 bp->b_data = (void *)(uintptr_t)cb->aio_buf; 1134 bp->b_blkno = btodb(cb->aio_offset); 1135 1136 if (cb->aio_lio_opcode == LIO_WRITE) { 1137 bp->b_iocmd = BIO_WRITE; 1138 if (!useracc(bp->b_data, bp->b_bufsize, VM_PROT_READ)) { 1139 error = EFAULT; 1140 goto doerror; 1141 } 1142 } else { 1143 bp->b_iocmd = BIO_READ; 1144 if (!useracc(bp->b_data, bp->b_bufsize, VM_PROT_WRITE)) { 1145 error = EFAULT; 1146 goto doerror; 1147 } 1148 } 1149 1150 /* Bring buffer into kernel space. */ 1151 vmapbuf(bp); 1152 1153 s = splbio(); 1154 aiocbe->bp = bp; 1155 bp->b_spc = (void *)aiocbe; 1156 TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list); 1157 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); 1158 aiocbe->jobstate = JOBST_JOBQBUF; 1159 cb->_aiocb_private.status = cb->aio_nbytes; 1160 num_buf_aio++; 1161 bp->b_error = 0; 1162 1163 splx(s); 1164 1165 /* Perform transfer. */ 1166 DEV_STRATEGY(bp, 0); 1167 1168 notify = 0; 1169 s = splbio(); 1170 1171 /* 1172 * If we had an error invoking the request, or an error in processing 1173 * the request before we have returned, we process it as an error in 1174 * transfer. Note that such an I/O error is not indicated immediately, 1175 * but is returned using the aio_error mechanism. In this case, 1176 * aio_suspend will return immediately. 1177 */ 1178 if (bp->b_error || (bp->b_ioflags & BIO_ERROR)) { 1179 struct aiocb *job = aiocbe->uuaiocb; 1180 1181 aiocbe->uaiocb._aiocb_private.status = 0; 1182 suword(&job->_aiocb_private.status, 0); 1183 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 1184 suword(&job->_aiocb_private.error, bp->b_error); 1185 1186 ki->kaio_buffer_finished_count++; 1187 1188 if (aiocbe->jobstate != JOBST_JOBBFINISHED) { 1189 aiocbe->jobstate = JOBST_JOBBFINISHED; 1190 aiocbe->jobflags |= AIOCBLIST_DONE; 1191 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 1192 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 1193 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 1194 notify = 1; 1195 } 1196 } 1197 splx(s); 1198 if (notify) 1199 KNOTE(&aiocbe->klist, 0); 1200 return 0; 1201 1202 doerror: 1203 ki->kaio_buffer_count--; 1204 if (lj) 1205 lj->lioj_buffer_count--; 1206 aiocbe->bp = NULL; 1207 relpbuf(bp, NULL); 1208 return error; 1209 } 1210 1211 /* 1212 * This waits/tests physio completion. 1213 */ 1214 static int 1215 aio_fphysio(struct proc *p, struct aiocblist *iocb) 1216 { 1217 int s; 1218 struct buf *bp; 1219 int error; 1220 1221 bp = iocb->bp; 1222 1223 s = splbio(); 1224 while ((bp->b_flags & B_DONE) == 0) { 1225 if (tsleep(bp, PRIBIO, "physstr", aiod_timeout)) { 1226 if ((bp->b_flags & B_DONE) == 0) { 1227 splx(s); 1228 return EINPROGRESS; 1229 } else 1230 break; 1231 } 1232 } 1233 splx(s); 1234 1235 /* Release mapping into kernel space. */ 1236 vunmapbuf(bp); 1237 iocb->bp = 0; 1238 1239 error = 0; 1240 1241 /* Check for an error. */ 1242 if (bp->b_ioflags & BIO_ERROR) 1243 error = bp->b_error; 1244 1245 relpbuf(bp, NULL); 1246 return (error); 1247 } 1248 1249 /* 1250 * Wake up aio requests that may be serviceable now. 1251 */ 1252 static void 1253 aio_swake_cb(struct socket *so, struct sockbuf *sb) 1254 { 1255 struct aiocblist *cb,*cbn; 1256 struct proc *p; 1257 struct kaioinfo *ki = NULL; 1258 int opcode, wakecount = 0; 1259 struct aiothreadlist *aiop; 1260 1261 if (sb == &so->so_snd) { 1262 opcode = LIO_WRITE; 1263 so->so_snd.sb_flags &= ~SB_AIO; 1264 } else { 1265 opcode = LIO_READ; 1266 so->so_rcv.sb_flags &= ~SB_AIO; 1267 } 1268 1269 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) { 1270 cbn = TAILQ_NEXT(cb, list); 1271 if (opcode == cb->uaiocb.aio_lio_opcode) { 1272 p = cb->userproc; 1273 ki = p->p_aioinfo; 1274 TAILQ_REMOVE(&so->so_aiojobq, cb, list); 1275 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist); 1276 TAILQ_INSERT_TAIL(&aio_jobs, cb, list); 1277 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist); 1278 wakecount++; 1279 if (cb->jobstate != JOBST_JOBQGLOBAL) 1280 panic("invalid queue value"); 1281 } 1282 } 1283 1284 while (wakecount--) { 1285 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) { 1286 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1287 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1288 aiop->aiothreadflags &= ~AIOP_FREE; 1289 wakeup(aiop->aiothread); 1290 } 1291 } 1292 } 1293 1294 /* 1295 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR 1296 * technique is done in this code. 1297 */ 1298 static int 1299 _aio_aqueue(struct thread *td, struct aiocb *job, struct aio_liojob *lj, int type) 1300 { 1301 struct proc *p = td->td_proc; 1302 struct filedesc *fdp; 1303 struct file *fp; 1304 unsigned int fd; 1305 struct socket *so; 1306 int s; 1307 int error; 1308 int opcode; 1309 struct aiocblist *aiocbe; 1310 struct aiothreadlist *aiop; 1311 struct kaioinfo *ki; 1312 struct kevent kev; 1313 struct kqueue *kq; 1314 struct file *kq_fp; 1315 1316 aiocbe = zalloc(aiocb_zone); 1317 aiocbe->inputcharge = 0; 1318 aiocbe->outputcharge = 0; 1319 callout_handle_init(&aiocbe->timeouthandle); 1320 SLIST_INIT(&aiocbe->klist); 1321 1322 suword(&job->_aiocb_private.status, -1); 1323 suword(&job->_aiocb_private.error, 0); 1324 suword(&job->_aiocb_private.kernelinfo, -1); 1325 1326 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb)); 1327 if (error) { 1328 suword(&job->_aiocb_private.error, error); 1329 zfree(aiocb_zone, aiocbe); 1330 return error; 1331 } 1332 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL && 1333 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) { 1334 zfree(aiocb_zone, aiocbe); 1335 return EINVAL; 1336 } 1337 1338 /* Save userspace address of the job info. */ 1339 aiocbe->uuaiocb = job; 1340 1341 /* Get the opcode. */ 1342 if (type != LIO_NOP) 1343 aiocbe->uaiocb.aio_lio_opcode = type; 1344 opcode = aiocbe->uaiocb.aio_lio_opcode; 1345 1346 /* Get the fd info for process. */ 1347 fdp = p->p_fd; 1348 1349 /* 1350 * Range check file descriptor. 1351 */ 1352 fd = aiocbe->uaiocb.aio_fildes; 1353 if (fd >= fdp->fd_nfiles) { 1354 zfree(aiocb_zone, aiocbe); 1355 if (type == 0) 1356 suword(&job->_aiocb_private.error, EBADF); 1357 return EBADF; 1358 } 1359 1360 fp = aiocbe->fd_file = fdp->fd_ofiles[fd]; 1361 if ((fp == NULL) || ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) == 1362 0))) { 1363 zfree(aiocb_zone, aiocbe); 1364 if (type == 0) 1365 suword(&job->_aiocb_private.error, EBADF); 1366 return EBADF; 1367 } 1368 1369 if (aiocbe->uaiocb.aio_offset == -1LL) { 1370 zfree(aiocb_zone, aiocbe); 1371 if (type == 0) 1372 suword(&job->_aiocb_private.error, EINVAL); 1373 return EINVAL; 1374 } 1375 1376 error = suword(&job->_aiocb_private.kernelinfo, jobrefid); 1377 if (error) { 1378 zfree(aiocb_zone, aiocbe); 1379 if (type == 0) 1380 suword(&job->_aiocb_private.error, EINVAL); 1381 return error; 1382 } 1383 1384 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid; 1385 if (jobrefid == LONG_MAX) 1386 jobrefid = 1; 1387 else 1388 jobrefid++; 1389 1390 if (opcode == LIO_NOP) { 1391 zfree(aiocb_zone, aiocbe); 1392 if (type == 0) { 1393 suword(&job->_aiocb_private.error, 0); 1394 suword(&job->_aiocb_private.status, 0); 1395 suword(&job->_aiocb_private.kernelinfo, 0); 1396 } 1397 return 0; 1398 } 1399 1400 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) { 1401 zfree(aiocb_zone, aiocbe); 1402 if (type == 0) { 1403 suword(&job->_aiocb_private.status, 0); 1404 suword(&job->_aiocb_private.error, EINVAL); 1405 } 1406 return EINVAL; 1407 } 1408 1409 fhold(fp); 1410 1411 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) { 1412 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue; 1413 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr; 1414 } 1415 else { 1416 /* 1417 * This method for requesting kevent-based notification won't 1418 * work on the alpha, since we're passing in a pointer 1419 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT- 1420 * based method instead. 1421 */ 1422 struct kevent *kevp; 1423 1424 kevp = (struct kevent *)(uintptr_t)job->aio_lio_opcode; 1425 if (kevp == NULL) 1426 goto no_kqueue; 1427 1428 error = copyin(kevp, &kev, sizeof(kev)); 1429 if (error) 1430 goto aqueue_fail; 1431 } 1432 if ((u_int)kev.ident >= fdp->fd_nfiles || 1433 (kq_fp = fdp->fd_ofiles[kev.ident]) == NULL || 1434 (kq_fp->f_type != DTYPE_KQUEUE)) { 1435 error = EBADF; 1436 goto aqueue_fail; 1437 } 1438 kq = (struct kqueue *)kq_fp->f_data; 1439 kev.ident = (uintptr_t)aiocbe; 1440 kev.filter = EVFILT_AIO; 1441 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 1442 error = kqueue_register(kq, &kev, td); 1443 aqueue_fail: 1444 if (error) { 1445 zfree(aiocb_zone, aiocbe); 1446 if (type == 0) 1447 suword(&job->_aiocb_private.error, error); 1448 goto done; 1449 } 1450 no_kqueue: 1451 1452 suword(&job->_aiocb_private.error, EINPROGRESS); 1453 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; 1454 aiocbe->userproc = p; 1455 aiocbe->jobflags = 0; 1456 aiocbe->lio = lj; 1457 ki = p->p_aioinfo; 1458 1459 if (fp->f_type == DTYPE_SOCKET) { 1460 /* 1461 * Alternate queueing for socket ops: Reach down into the 1462 * descriptor to get the socket data. Then check to see if the 1463 * socket is ready to be read or written (based on the requested 1464 * operation). 1465 * 1466 * If it is not ready for io, then queue the aiocbe on the 1467 * socket, and set the flags so we get a call when sbnotify() 1468 * happens. 1469 */ 1470 so = (struct socket *)fp->f_data; 1471 s = splnet(); 1472 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode == 1473 LIO_WRITE) && (!sowriteable(so)))) { 1474 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list); 1475 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist); 1476 if (opcode == LIO_READ) 1477 so->so_rcv.sb_flags |= SB_AIO; 1478 else 1479 so->so_snd.sb_flags |= SB_AIO; 1480 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */ 1481 ki->kaio_queue_count++; 1482 num_queue_count++; 1483 splx(s); 1484 error = 0; 1485 goto done; 1486 } 1487 splx(s); 1488 } 1489 1490 if ((error = aio_qphysio(p, aiocbe)) == 0) 1491 goto done; 1492 if (error > 0) { 1493 suword(&job->_aiocb_private.status, 0); 1494 aiocbe->uaiocb._aiocb_private.error = error; 1495 suword(&job->_aiocb_private.error, error); 1496 goto done; 1497 } 1498 1499 /* No buffer for daemon I/O. */ 1500 aiocbe->bp = NULL; 1501 1502 ki->kaio_queue_count++; 1503 if (lj) 1504 lj->lioj_queue_count++; 1505 s = splnet(); 1506 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); 1507 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); 1508 splx(s); 1509 aiocbe->jobstate = JOBST_JOBQGLOBAL; 1510 1511 num_queue_count++; 1512 error = 0; 1513 1514 /* 1515 * If we don't have a free AIO process, and we are below our quota, then 1516 * start one. Otherwise, depend on the subsequent I/O completions to 1517 * pick-up this job. If we don't sucessfully create the new process 1518 * (thread) due to resource issues, we return an error for now (EAGAIN), 1519 * which is likely not the correct thing to do. 1520 */ 1521 retryproc: 1522 s = splnet(); 1523 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1524 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1525 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1526 aiop->aiothreadflags &= ~AIOP_FREE; 1527 wakeup(aiop->aiothread); 1528 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && 1529 ((ki->kaio_active_count + num_aio_resv_start) < 1530 ki->kaio_maxactive_count)) { 1531 num_aio_resv_start++; 1532 if ((error = aio_newproc()) == 0) { 1533 num_aio_resv_start--; 1534 td->td_retval[0] = 0; 1535 goto retryproc; 1536 } 1537 num_aio_resv_start--; 1538 } 1539 splx(s); 1540 done: 1541 fdrop(fp, td); 1542 return error; 1543 } 1544 1545 /* 1546 * This routine queues an AIO request, checking for quotas. 1547 */ 1548 static int 1549 aio_aqueue(struct thread *td, struct aiocb *job, int type) 1550 { 1551 struct proc *p = td->td_proc; 1552 struct kaioinfo *ki; 1553 1554 if (p->p_aioinfo == NULL) 1555 aio_init_aioinfo(p); 1556 1557 if (num_queue_count >= max_queue_count) 1558 return EAGAIN; 1559 1560 ki = p->p_aioinfo; 1561 if (ki->kaio_queue_count >= ki->kaio_qallowed_count) 1562 return EAGAIN; 1563 1564 return _aio_aqueue(td, job, NULL, type); 1565 } 1566 1567 /* 1568 * Support the aio_return system call, as a side-effect, kernel resources are 1569 * released. 1570 */ 1571 int 1572 aio_return(struct thread *td, struct aio_return_args *uap) 1573 { 1574 struct proc *p = td->td_proc; 1575 int s; 1576 int jobref; 1577 struct aiocblist *cb, *ncb; 1578 struct aiocb *ujob; 1579 struct kaioinfo *ki; 1580 1581 ki = p->p_aioinfo; 1582 if (ki == NULL) 1583 return EINVAL; 1584 1585 ujob = uap->aiocbp; 1586 1587 jobref = fuword(&ujob->_aiocb_private.kernelinfo); 1588 if (jobref == -1 || jobref == 0) 1589 return EINVAL; 1590 1591 s = splnet(); 1592 for (cb = TAILQ_FIRST(&ki->kaio_jobdone); cb; cb = TAILQ_NEXT(cb, 1593 plist)) { 1594 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == 1595 jobref) { 1596 splx(s); 1597 if (ujob == cb->uuaiocb) { 1598 td->td_retval[0] = 1599 cb->uaiocb._aiocb_private.status; 1600 } else 1601 td->td_retval[0] = EFAULT; 1602 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 1603 p->p_stats->p_ru.ru_oublock += 1604 cb->outputcharge; 1605 cb->outputcharge = 0; 1606 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 1607 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 1608 cb->inputcharge = 0; 1609 } 1610 aio_free_entry(cb); 1611 return 0; 1612 } 1613 } 1614 splx(s); 1615 1616 s = splbio(); 1617 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) { 1618 ncb = TAILQ_NEXT(cb, plist); 1619 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) 1620 == jobref) { 1621 splx(s); 1622 if (ujob == cb->uuaiocb) { 1623 td->td_retval[0] = 1624 cb->uaiocb._aiocb_private.status; 1625 } else 1626 td->td_retval[0] = EFAULT; 1627 aio_free_entry(cb); 1628 return 0; 1629 } 1630 } 1631 splx(s); 1632 1633 return (EINVAL); 1634 } 1635 1636 /* 1637 * Allow a process to wakeup when any of the I/O requests are completed. 1638 */ 1639 int 1640 aio_suspend(struct thread *td, struct aio_suspend_args *uap) 1641 { 1642 struct proc *p = td->td_proc; 1643 struct timeval atv; 1644 struct timespec ts; 1645 struct aiocb *const *cbptr, *cbp; 1646 struct kaioinfo *ki; 1647 struct aiocblist *cb; 1648 int i; 1649 int njoblist; 1650 int error, s, timo; 1651 int *ijoblist; 1652 struct aiocb **ujoblist; 1653 1654 if (uap->nent > AIO_LISTIO_MAX) 1655 return EINVAL; 1656 1657 timo = 0; 1658 if (uap->timeout) { 1659 /* Get timespec struct. */ 1660 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 1661 return error; 1662 1663 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) 1664 return (EINVAL); 1665 1666 TIMESPEC_TO_TIMEVAL(&atv, &ts); 1667 if (itimerfix(&atv)) 1668 return (EINVAL); 1669 timo = tvtohz(&atv); 1670 } 1671 1672 ki = p->p_aioinfo; 1673 if (ki == NULL) 1674 return EAGAIN; 1675 1676 njoblist = 0; 1677 ijoblist = zalloc(aiol_zone); 1678 ujoblist = zalloc(aiol_zone); 1679 cbptr = uap->aiocbp; 1680 1681 for (i = 0; i < uap->nent; i++) { 1682 cbp = (struct aiocb *)(intptr_t)fuword((caddr_t)&cbptr[i]); 1683 if (cbp == 0) 1684 continue; 1685 ujoblist[njoblist] = cbp; 1686 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo); 1687 njoblist++; 1688 } 1689 1690 if (njoblist == 0) { 1691 zfree(aiol_zone, ijoblist); 1692 zfree(aiol_zone, ujoblist); 1693 return 0; 1694 } 1695 1696 error = 0; 1697 for (;;) { 1698 for (cb = TAILQ_FIRST(&ki->kaio_jobdone); cb; cb = 1699 TAILQ_NEXT(cb, plist)) { 1700 for (i = 0; i < njoblist; i++) { 1701 if (((intptr_t) 1702 cb->uaiocb._aiocb_private.kernelinfo) == 1703 ijoblist[i]) { 1704 if (ujoblist[i] != cb->uuaiocb) 1705 error = EINVAL; 1706 zfree(aiol_zone, ijoblist); 1707 zfree(aiol_zone, ujoblist); 1708 return error; 1709 } 1710 } 1711 } 1712 1713 s = splbio(); 1714 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = 1715 TAILQ_NEXT(cb, plist)) { 1716 for (i = 0; i < njoblist; i++) { 1717 if (((intptr_t) 1718 cb->uaiocb._aiocb_private.kernelinfo) == 1719 ijoblist[i]) { 1720 splx(s); 1721 if (ujoblist[i] != cb->uuaiocb) 1722 error = EINVAL; 1723 zfree(aiol_zone, ijoblist); 1724 zfree(aiol_zone, ujoblist); 1725 return error; 1726 } 1727 } 1728 } 1729 1730 ki->kaio_flags |= KAIO_WAKEUP; 1731 error = tsleep(p, PRIBIO | PCATCH, "aiospn", timo); 1732 splx(s); 1733 1734 if (error == ERESTART || error == EINTR) { 1735 zfree(aiol_zone, ijoblist); 1736 zfree(aiol_zone, ujoblist); 1737 return EINTR; 1738 } else if (error == EWOULDBLOCK) { 1739 zfree(aiol_zone, ijoblist); 1740 zfree(aiol_zone, ujoblist); 1741 return EAGAIN; 1742 } 1743 } 1744 1745 /* NOTREACHED */ 1746 return EINVAL; 1747 } 1748 1749 /* 1750 * aio_cancel cancels any non-physio aio operations not currently in 1751 * progress. 1752 */ 1753 int 1754 aio_cancel(struct thread *td, struct aio_cancel_args *uap) 1755 { 1756 struct proc *p = td->td_proc; 1757 struct kaioinfo *ki; 1758 struct aiocblist *cbe, *cbn; 1759 struct file *fp; 1760 struct filedesc *fdp; 1761 struct socket *so; 1762 struct proc *po; 1763 int s,error; 1764 int cancelled=0; 1765 int notcancelled=0; 1766 struct vnode *vp; 1767 1768 fdp = p->p_fd; 1769 if ((u_int)uap->fd >= fdp->fd_nfiles || 1770 (fp = fdp->fd_ofiles[uap->fd]) == NULL) 1771 return (EBADF); 1772 1773 if (fp->f_type == DTYPE_VNODE) { 1774 vp = (struct vnode *)fp->f_data; 1775 1776 if (vn_isdisk(vp,&error)) { 1777 td->td_retval[0] = AIO_NOTCANCELED; 1778 return 0; 1779 } 1780 } else if (fp->f_type == DTYPE_SOCKET) { 1781 so = (struct socket *)fp->f_data; 1782 1783 s = splnet(); 1784 1785 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) { 1786 cbn = TAILQ_NEXT(cbe, list); 1787 if ((uap->aiocbp == NULL) || 1788 (uap->aiocbp == cbe->uuaiocb) ) { 1789 po = cbe->userproc; 1790 ki = po->p_aioinfo; 1791 TAILQ_REMOVE(&so->so_aiojobq, cbe, list); 1792 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist); 1793 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist); 1794 if (ki->kaio_flags & KAIO_WAKEUP) { 1795 wakeup(po); 1796 } 1797 cbe->jobstate = JOBST_JOBFINISHED; 1798 cbe->uaiocb._aiocb_private.status=-1; 1799 cbe->uaiocb._aiocb_private.error=ECANCELED; 1800 cancelled++; 1801 /* XXX cancelled, knote? */ 1802 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1803 SIGEV_SIGNAL) { 1804 PROC_LOCK(cbe->userproc); 1805 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1806 PROC_UNLOCK(cbe->userproc); 1807 } 1808 if (uap->aiocbp) 1809 break; 1810 } 1811 } 1812 splx(s); 1813 1814 if ((cancelled) && (uap->aiocbp)) { 1815 td->td_retval[0] = AIO_CANCELED; 1816 return 0; 1817 } 1818 } 1819 ki=p->p_aioinfo; 1820 s = splnet(); 1821 1822 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) { 1823 cbn = TAILQ_NEXT(cbe, plist); 1824 1825 if ((uap->fd == cbe->uaiocb.aio_fildes) && 1826 ((uap->aiocbp == NULL ) || 1827 (uap->aiocbp == cbe->uuaiocb))) { 1828 1829 if (cbe->jobstate == JOBST_JOBQGLOBAL) { 1830 TAILQ_REMOVE(&aio_jobs, cbe, list); 1831 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); 1832 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, 1833 plist); 1834 cancelled++; 1835 ki->kaio_queue_finished_count++; 1836 cbe->jobstate = JOBST_JOBFINISHED; 1837 cbe->uaiocb._aiocb_private.status = -1; 1838 cbe->uaiocb._aiocb_private.error = ECANCELED; 1839 /* XXX cancelled, knote? */ 1840 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1841 SIGEV_SIGNAL) { 1842 PROC_LOCK(cbe->userproc); 1843 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1844 PROC_UNLOCK(cbe->userproc); 1845 } 1846 } else { 1847 notcancelled++; 1848 } 1849 } 1850 } 1851 splx(s); 1852 1853 if (notcancelled) { 1854 td->td_retval[0] = AIO_NOTCANCELED; 1855 return 0; 1856 } 1857 if (cancelled) { 1858 td->td_retval[0] = AIO_CANCELED; 1859 return 0; 1860 } 1861 td->td_retval[0] = AIO_ALLDONE; 1862 1863 return 0; 1864 } 1865 1866 /* 1867 * aio_error is implemented in the kernel level for compatibility purposes only. 1868 * For a user mode async implementation, it would be best to do it in a userland 1869 * subroutine. 1870 */ 1871 int 1872 aio_error(struct thread *td, struct aio_error_args *uap) 1873 { 1874 struct proc *p = td->td_proc; 1875 int s; 1876 struct aiocblist *cb; 1877 struct kaioinfo *ki; 1878 int jobref; 1879 1880 ki = p->p_aioinfo; 1881 if (ki == NULL) 1882 return EINVAL; 1883 1884 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo); 1885 if ((jobref == -1) || (jobref == 0)) 1886 return EINVAL; 1887 1888 for (cb = TAILQ_FIRST(&ki->kaio_jobdone); cb; cb = TAILQ_NEXT(cb, 1889 plist)) { 1890 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1891 jobref) { 1892 td->td_retval[0] = cb->uaiocb._aiocb_private.error; 1893 return 0; 1894 } 1895 } 1896 1897 s = splnet(); 1898 1899 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb, 1900 plist)) { 1901 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1902 jobref) { 1903 td->td_retval[0] = EINPROGRESS; 1904 splx(s); 1905 return 0; 1906 } 1907 } 1908 1909 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb, 1910 plist)) { 1911 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1912 jobref) { 1913 td->td_retval[0] = EINPROGRESS; 1914 splx(s); 1915 return 0; 1916 } 1917 } 1918 splx(s); 1919 1920 s = splbio(); 1921 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, 1922 plist)) { 1923 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1924 jobref) { 1925 td->td_retval[0] = cb->uaiocb._aiocb_private.error; 1926 splx(s); 1927 return 0; 1928 } 1929 } 1930 1931 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb, 1932 plist)) { 1933 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1934 jobref) { 1935 td->td_retval[0] = EINPROGRESS; 1936 splx(s); 1937 return 0; 1938 } 1939 } 1940 splx(s); 1941 1942 #if (0) 1943 /* 1944 * Hack for lio. 1945 */ 1946 status = fuword(&uap->aiocbp->_aiocb_private.status); 1947 if (status == -1) 1948 return fuword(&uap->aiocbp->_aiocb_private.error); 1949 #endif 1950 return EINVAL; 1951 } 1952 1953 int 1954 aio_read(struct thread *td, struct aio_read_args *uap) 1955 { 1956 1957 return aio_aqueue(td, uap->aiocbp, LIO_READ); 1958 } 1959 1960 int 1961 aio_write(struct thread *td, struct aio_write_args *uap) 1962 { 1963 1964 return aio_aqueue(td, uap->aiocbp, LIO_WRITE); 1965 } 1966 1967 int 1968 lio_listio(struct thread *td, struct lio_listio_args *uap) 1969 { 1970 struct proc *p = td->td_proc; 1971 int nent, nentqueued; 1972 struct aiocb *iocb, * const *cbptr; 1973 struct aiocblist *cb; 1974 struct kaioinfo *ki; 1975 struct aio_liojob *lj; 1976 int error, runningcode; 1977 int nerror; 1978 int i; 1979 int s; 1980 1981 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 1982 return EINVAL; 1983 1984 nent = uap->nent; 1985 if (nent > AIO_LISTIO_MAX) 1986 return EINVAL; 1987 1988 if (p->p_aioinfo == NULL) 1989 aio_init_aioinfo(p); 1990 1991 if ((nent + num_queue_count) > max_queue_count) 1992 return EAGAIN; 1993 1994 ki = p->p_aioinfo; 1995 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) 1996 return EAGAIN; 1997 1998 lj = zalloc(aiolio_zone); 1999 if (!lj) 2000 return EAGAIN; 2001 2002 lj->lioj_flags = 0; 2003 lj->lioj_buffer_count = 0; 2004 lj->lioj_buffer_finished_count = 0; 2005 lj->lioj_queue_count = 0; 2006 lj->lioj_queue_finished_count = 0; 2007 lj->lioj_ki = ki; 2008 2009 /* 2010 * Setup signal. 2011 */ 2012 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 2013 error = copyin(uap->sig, &lj->lioj_signal, 2014 sizeof(lj->lioj_signal)); 2015 if (error) { 2016 zfree(aiolio_zone, lj); 2017 return error; 2018 } 2019 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 2020 zfree(aiolio_zone, lj); 2021 return EINVAL; 2022 } 2023 lj->lioj_flags |= LIOJ_SIGNAL; 2024 lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED; 2025 } else 2026 lj->lioj_flags &= ~LIOJ_SIGNAL; 2027 2028 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 2029 /* 2030 * Get pointers to the list of I/O requests. 2031 */ 2032 nerror = 0; 2033 nentqueued = 0; 2034 cbptr = uap->acb_list; 2035 for (i = 0; i < uap->nent; i++) { 2036 iocb = (struct aiocb *)(intptr_t)fuword((caddr_t)&cbptr[i]); 2037 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != NULL)) { 2038 error = _aio_aqueue(td, iocb, lj, 0); 2039 if (error == 0) 2040 nentqueued++; 2041 else 2042 nerror++; 2043 } 2044 } 2045 2046 /* 2047 * If we haven't queued any, then just return error. 2048 */ 2049 if (nentqueued == 0) 2050 return 0; 2051 2052 /* 2053 * Calculate the appropriate error return. 2054 */ 2055 runningcode = 0; 2056 if (nerror) 2057 runningcode = EIO; 2058 2059 if (uap->mode == LIO_WAIT) { 2060 int command, found, jobref; 2061 2062 for (;;) { 2063 found = 0; 2064 for (i = 0; i < uap->nent; i++) { 2065 /* 2066 * Fetch address of the control buf pointer in 2067 * user space. 2068 */ 2069 iocb = (struct aiocb *)(intptr_t)fuword((caddr_t)&cbptr[i]); 2070 if (((intptr_t)iocb == -1) || ((intptr_t)iocb 2071 == 0)) 2072 continue; 2073 2074 /* 2075 * Fetch the associated command from user space. 2076 */ 2077 command = fuword(&iocb->aio_lio_opcode); 2078 if (command == LIO_NOP) { 2079 found++; 2080 continue; 2081 } 2082 2083 jobref = fuword(&iocb->_aiocb_private.kernelinfo); 2084 2085 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 2086 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 2087 == jobref) { 2088 if (cb->uaiocb.aio_lio_opcode 2089 == LIO_WRITE) { 2090 p->p_stats->p_ru.ru_oublock 2091 += 2092 cb->outputcharge; 2093 cb->outputcharge = 0; 2094 } else if (cb->uaiocb.aio_lio_opcode 2095 == LIO_READ) { 2096 p->p_stats->p_ru.ru_inblock 2097 += cb->inputcharge; 2098 cb->inputcharge = 0; 2099 } 2100 found++; 2101 break; 2102 } 2103 } 2104 2105 s = splbio(); 2106 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) { 2107 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 2108 == jobref) { 2109 found++; 2110 break; 2111 } 2112 } 2113 splx(s); 2114 } 2115 2116 /* 2117 * If all I/Os have been disposed of, then we can 2118 * return. 2119 */ 2120 if (found == nentqueued) 2121 return runningcode; 2122 2123 ki->kaio_flags |= KAIO_WAKEUP; 2124 error = tsleep(p, PRIBIO | PCATCH, "aiospn", 0); 2125 2126 if (error == EINTR) 2127 return EINTR; 2128 else if (error == EWOULDBLOCK) 2129 return EAGAIN; 2130 } 2131 } 2132 2133 return runningcode; 2134 } 2135 2136 /* 2137 * This is a weird hack so that we can post a signal. It is safe to do so from 2138 * a timeout routine, but *not* from an interrupt routine. 2139 */ 2140 static void 2141 process_signal(void *aioj) 2142 { 2143 struct aiocblist *aiocbe = aioj; 2144 struct aio_liojob *lj = aiocbe->lio; 2145 struct aiocb *cb = &aiocbe->uaiocb; 2146 2147 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) && 2148 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) { 2149 PROC_LOCK(lj->lioj_ki->kaio_p); 2150 psignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo); 2151 PROC_UNLOCK(lj->lioj_ki->kaio_p); 2152 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2153 } 2154 2155 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 2156 PROC_LOCK(aiocbe->userproc); 2157 psignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo); 2158 PROC_UNLOCK(aiocbe->userproc); 2159 } 2160 } 2161 2162 /* 2163 * Interrupt handler for physio, performs the necessary process wakeups, and 2164 * signals. 2165 */ 2166 static void 2167 aio_physwakeup(struct buf *bp) 2168 { 2169 struct aiocblist *aiocbe; 2170 struct proc *p; 2171 struct kaioinfo *ki; 2172 struct aio_liojob *lj; 2173 2174 wakeup(bp); 2175 2176 aiocbe = (struct aiocblist *)bp->b_spc; 2177 if (aiocbe) { 2178 p = bp->b_caller1; 2179 2180 aiocbe->jobstate = JOBST_JOBBFINISHED; 2181 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; 2182 aiocbe->uaiocb._aiocb_private.error = 0; 2183 aiocbe->jobflags |= AIOCBLIST_DONE; 2184 2185 if (bp->b_ioflags & BIO_ERROR) 2186 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 2187 2188 lj = aiocbe->lio; 2189 if (lj) { 2190 lj->lioj_buffer_finished_count++; 2191 2192 /* 2193 * wakeup/signal if all of the interrupt jobs are done. 2194 */ 2195 if (lj->lioj_buffer_finished_count == 2196 lj->lioj_buffer_count) { 2197 /* 2198 * Post a signal if it is called for. 2199 */ 2200 if ((lj->lioj_flags & 2201 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == 2202 LIOJ_SIGNAL) { 2203 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2204 aiocbe->timeouthandle = 2205 timeout(process_signal, 2206 aiocbe, 0); 2207 } 2208 } 2209 } 2210 2211 ki = p->p_aioinfo; 2212 if (ki) { 2213 ki->kaio_buffer_finished_count++; 2214 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 2215 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 2216 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 2217 2218 KNOTE(&aiocbe->klist, 0); 2219 /* Do the wakeup. */ 2220 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) { 2221 ki->kaio_flags &= ~KAIO_WAKEUP; 2222 wakeup(p); 2223 } 2224 } 2225 2226 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) 2227 aiocbe->timeouthandle = 2228 timeout(process_signal, aiocbe, 0); 2229 } 2230 } 2231 2232 int 2233 aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap) 2234 { 2235 struct proc *p = td->td_proc; 2236 struct timeval atv; 2237 struct timespec ts; 2238 struct aiocb **cbptr; 2239 struct kaioinfo *ki; 2240 struct aiocblist *cb = NULL; 2241 int error, s, timo; 2242 2243 suword(uap->aiocbp, (int)NULL); 2244 2245 timo = 0; 2246 if (uap->timeout) { 2247 /* Get timespec struct. */ 2248 error = copyin(uap->timeout, &ts, sizeof(ts)); 2249 if (error) 2250 return error; 2251 2252 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000)) 2253 return (EINVAL); 2254 2255 TIMESPEC_TO_TIMEVAL(&atv, &ts); 2256 if (itimerfix(&atv)) 2257 return (EINVAL); 2258 timo = tvtohz(&atv); 2259 } 2260 2261 ki = p->p_aioinfo; 2262 if (ki == NULL) 2263 return EAGAIN; 2264 2265 cbptr = uap->aiocbp; 2266 2267 for (;;) { 2268 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) { 2269 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2270 td->td_retval[0] = cb->uaiocb._aiocb_private.status; 2271 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 2272 p->p_stats->p_ru.ru_oublock += 2273 cb->outputcharge; 2274 cb->outputcharge = 0; 2275 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 2276 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 2277 cb->inputcharge = 0; 2278 } 2279 aio_free_entry(cb); 2280 return cb->uaiocb._aiocb_private.error; 2281 } 2282 2283 s = splbio(); 2284 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) { 2285 splx(s); 2286 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2287 td->td_retval[0] = cb->uaiocb._aiocb_private.status; 2288 aio_free_entry(cb); 2289 return cb->uaiocb._aiocb_private.error; 2290 } 2291 2292 ki->kaio_flags |= KAIO_WAKEUP; 2293 error = tsleep(p, PRIBIO | PCATCH, "aiowc", timo); 2294 splx(s); 2295 2296 if (error == ERESTART) 2297 return EINTR; 2298 else if (error < 0) 2299 return error; 2300 else if (error == EINTR) 2301 return EINTR; 2302 else if (error == EWOULDBLOCK) 2303 return EAGAIN; 2304 } 2305 } 2306 2307 static int 2308 filt_aioattach(struct knote *kn) 2309 { 2310 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_id; 2311 2312 /* 2313 * The aiocbe pointer must be validated before using it, so 2314 * registration is restricted to the kernel; the user cannot 2315 * set EV_FLAG1. 2316 */ 2317 if ((kn->kn_flags & EV_FLAG1) == 0) 2318 return (EPERM); 2319 kn->kn_flags &= ~EV_FLAG1; 2320 2321 SLIST_INSERT_HEAD(&aiocbe->klist, kn, kn_selnext); 2322 2323 return (0); 2324 } 2325 2326 static void 2327 filt_aiodetach(struct knote *kn) 2328 { 2329 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_id; 2330 2331 SLIST_REMOVE(&aiocbe->klist, kn, knote, kn_selnext); 2332 } 2333 2334 /*ARGSUSED*/ 2335 static int 2336 filt_aio(struct knote *kn, long hint) 2337 { 2338 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_id; 2339 2340 kn->kn_data = aiocbe->uaiocb._aiocb_private.error; 2341 if (aiocbe->jobstate != JOBST_JOBFINISHED && 2342 aiocbe->jobstate != JOBST_JOBBFINISHED) 2343 return (0); 2344 kn->kn_flags |= EV_EOF; 2345 return (1); 2346 } 2347