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