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: src/sys/kern/vfs_aio.c,v 1.70.2.28 2003/05/29 06:15:35 alc Exp $ 17 * $DragonFly: src/sys/kern/vfs_aio.c,v 1.14 2004/09/16 04:42:56 dillon Exp $ 18 */ 19 20 /* 21 * This file contains support for the POSIX 1003.1B AIO/LIO facility. 22 */ 23 24 #include <sys/param.h> 25 #include <sys/systm.h> 26 #include <sys/buf.h> 27 #include <sys/sysproto.h> 28 #include <sys/filedesc.h> 29 #include <sys/kernel.h> 30 #include <sys/fcntl.h> 31 #include <sys/file.h> 32 #include <sys/lock.h> 33 #include <sys/unistd.h> 34 #include <sys/proc.h> 35 #include <sys/resourcevar.h> 36 #include <sys/signalvar.h> 37 #include <sys/protosw.h> 38 #include <sys/socketvar.h> 39 #include <sys/sysctl.h> 40 #include <sys/vnode.h> 41 #include <sys/conf.h> 42 #include <sys/event.h> 43 44 #include <vm/vm.h> 45 #include <vm/vm_extern.h> 46 #include <vm/pmap.h> 47 #include <vm/vm_map.h> 48 #include <vm/vm_zone.h> 49 #include <sys/aio.h> 50 #include <sys/file2.h> 51 #include <sys/buf2.h> 52 53 #include <machine/limits.h> 54 #include "opt_vfs_aio.h" 55 56 #ifdef VFS_AIO 57 58 /* 59 * Counter for allocating reference ids to new jobs. Wrapped to 1 on 60 * overflow. 61 */ 62 static long jobrefid; 63 64 #define JOBST_NULL 0x0 65 #define JOBST_JOBQGLOBAL 0x2 66 #define JOBST_JOBRUNNING 0x3 67 #define JOBST_JOBFINISHED 0x4 68 #define JOBST_JOBQBUF 0x5 69 #define JOBST_JOBBFINISHED 0x6 70 71 #ifndef MAX_AIO_PER_PROC 72 #define MAX_AIO_PER_PROC 32 73 #endif 74 75 #ifndef MAX_AIO_QUEUE_PER_PROC 76 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */ 77 #endif 78 79 #ifndef MAX_AIO_PROCS 80 #define MAX_AIO_PROCS 32 81 #endif 82 83 #ifndef MAX_AIO_QUEUE 84 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */ 85 #endif 86 87 #ifndef TARGET_AIO_PROCS 88 #define TARGET_AIO_PROCS 4 89 #endif 90 91 #ifndef MAX_BUF_AIO 92 #define MAX_BUF_AIO 16 93 #endif 94 95 #ifndef AIOD_TIMEOUT_DEFAULT 96 #define AIOD_TIMEOUT_DEFAULT (10 * hz) 97 #endif 98 99 #ifndef AIOD_LIFETIME_DEFAULT 100 #define AIOD_LIFETIME_DEFAULT (30 * hz) 101 #endif 102 103 SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management"); 104 105 static int max_aio_procs = MAX_AIO_PROCS; 106 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, 107 CTLFLAG_RW, &max_aio_procs, 0, 108 "Maximum number of kernel threads to use for handling async IO"); 109 110 static int num_aio_procs = 0; 111 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, 112 CTLFLAG_RD, &num_aio_procs, 0, 113 "Number of presently active kernel threads for async IO"); 114 115 /* 116 * The code will adjust the actual number of AIO processes towards this 117 * number when it gets a chance. 118 */ 119 static int target_aio_procs = TARGET_AIO_PROCS; 120 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 121 0, "Preferred number of ready kernel threads for async IO"); 122 123 static int max_queue_count = MAX_AIO_QUEUE; 124 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, 125 "Maximum number of aio requests to queue, globally"); 126 127 static int num_queue_count = 0; 128 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, 129 "Number of queued aio requests"); 130 131 static int num_buf_aio = 0; 132 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, 133 "Number of aio requests presently handled by the buf subsystem"); 134 135 /* Number of async I/O thread in the process of being started */ 136 /* XXX This should be local to _aio_aqueue() */ 137 static int num_aio_resv_start = 0; 138 139 static int aiod_timeout; 140 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0, 141 "Timeout value for synchronous aio operations"); 142 143 static int aiod_lifetime; 144 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, 145 "Maximum lifetime for idle aiod"); 146 147 static int max_aio_per_proc = MAX_AIO_PER_PROC; 148 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 149 0, "Maximum active aio requests per process (stored in the process)"); 150 151 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 152 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, 153 &max_aio_queue_per_proc, 0, 154 "Maximum queued aio requests per process (stored in the process)"); 155 156 static int max_buf_aio = MAX_BUF_AIO; 157 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, 158 "Maximum buf aio requests per process (stored in the process)"); 159 160 /* 161 * AIO process info 162 */ 163 #define AIOP_FREE 0x1 /* proc on free queue */ 164 #define AIOP_SCHED 0x2 /* proc explicitly scheduled */ 165 166 struct aioproclist { 167 int aioprocflags; /* AIO proc flags */ 168 TAILQ_ENTRY(aioproclist) list; /* List of processes */ 169 struct proc *aioproc; /* The AIO thread */ 170 }; 171 172 /* 173 * data-structure for lio signal management 174 */ 175 struct aio_liojob { 176 int lioj_flags; 177 int lioj_buffer_count; 178 int lioj_buffer_finished_count; 179 int lioj_queue_count; 180 int lioj_queue_finished_count; 181 struct sigevent lioj_signal; /* signal on all I/O done */ 182 TAILQ_ENTRY(aio_liojob) lioj_list; 183 struct kaioinfo *lioj_ki; 184 }; 185 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ 186 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ 187 188 /* 189 * per process aio data structure 190 */ 191 struct kaioinfo { 192 int kaio_flags; /* per process kaio flags */ 193 int kaio_maxactive_count; /* maximum number of AIOs */ 194 int kaio_active_count; /* number of currently used AIOs */ 195 int kaio_qallowed_count; /* maxiumu size of AIO queue */ 196 int kaio_queue_count; /* size of AIO queue */ 197 int kaio_ballowed_count; /* maximum number of buffers */ 198 int kaio_queue_finished_count; /* number of daemon jobs finished */ 199 int kaio_buffer_count; /* number of physio buffers */ 200 int kaio_buffer_finished_count; /* count of I/O done */ 201 struct proc *kaio_p; /* process that uses this kaio block */ 202 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */ 203 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */ 204 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */ 205 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */ 206 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */ 207 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */ 208 }; 209 210 #define KAIO_RUNDOWN 0x1 /* process is being run down */ 211 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ 212 213 static TAILQ_HEAD(,aioproclist) aio_freeproc, aio_activeproc; 214 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */ 215 static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */ 216 static TAILQ_HEAD(,aiocblist) aio_freejobs; /* Pool of free jobs */ 217 218 static void aio_init_aioinfo(struct proc *p); 219 static void aio_onceonly(void *); 220 static int aio_free_entry(struct aiocblist *aiocbe); 221 static void aio_process(struct aiocblist *aiocbe); 222 static int aio_newproc(void); 223 static int aio_aqueue(struct aiocb *job, int type); 224 static void aio_physwakeup(struct buf *bp); 225 static int aio_fphysio(struct aiocblist *aiocbe); 226 static int aio_qphysio(struct proc *p, struct aiocblist *iocb); 227 static void aio_daemon(void *uproc); 228 static void process_signal(void *aioj); 229 230 SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL); 231 232 /* 233 * Zones for: 234 * kaio Per process async io info 235 * aiop async io thread data 236 * aiocb async io jobs 237 * aiol list io job pointer - internal to aio_suspend XXX 238 * aiolio list io jobs 239 */ 240 static vm_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone; 241 242 /* 243 * Startup initialization 244 */ 245 static void 246 aio_onceonly(void *na) 247 { 248 TAILQ_INIT(&aio_freeproc); 249 TAILQ_INIT(&aio_activeproc); 250 TAILQ_INIT(&aio_jobs); 251 TAILQ_INIT(&aio_bufjobs); 252 TAILQ_INIT(&aio_freejobs); 253 kaio_zone = zinit("AIO", sizeof(struct kaioinfo), 0, 0, 1); 254 aiop_zone = zinit("AIOP", sizeof(struct aioproclist), 0, 0, 1); 255 aiocb_zone = zinit("AIOCB", sizeof(struct aiocblist), 0, 0, 1); 256 aiol_zone = zinit("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t), 0, 0, 1); 257 aiolio_zone = zinit("AIOLIO", sizeof(struct aio_liojob), 0, 0, 1); 258 aiod_timeout = AIOD_TIMEOUT_DEFAULT; 259 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 260 jobrefid = 1; 261 } 262 263 /* 264 * Init the per-process aioinfo structure. The aioinfo limits are set 265 * per-process for user limit (resource) management. 266 */ 267 static void 268 aio_init_aioinfo(struct proc *p) 269 { 270 struct kaioinfo *ki; 271 if (p->p_aioinfo == NULL) { 272 ki = zalloc(kaio_zone); 273 p->p_aioinfo = ki; 274 ki->kaio_flags = 0; 275 ki->kaio_maxactive_count = max_aio_per_proc; 276 ki->kaio_active_count = 0; 277 ki->kaio_qallowed_count = max_aio_queue_per_proc; 278 ki->kaio_queue_count = 0; 279 ki->kaio_ballowed_count = max_buf_aio; 280 ki->kaio_buffer_count = 0; 281 ki->kaio_buffer_finished_count = 0; 282 ki->kaio_p = p; 283 TAILQ_INIT(&ki->kaio_jobdone); 284 TAILQ_INIT(&ki->kaio_jobqueue); 285 TAILQ_INIT(&ki->kaio_bufdone); 286 TAILQ_INIT(&ki->kaio_bufqueue); 287 TAILQ_INIT(&ki->kaio_liojoblist); 288 TAILQ_INIT(&ki->kaio_sockqueue); 289 } 290 291 while (num_aio_procs < target_aio_procs) 292 aio_newproc(); 293 } 294 295 /* 296 * Free a job entry. Wait for completion if it is currently active, but don't 297 * delay forever. If we delay, we return a flag that says that we have to 298 * restart the queue scan. 299 */ 300 static int 301 aio_free_entry(struct aiocblist *aiocbe) 302 { 303 struct kaioinfo *ki; 304 struct aio_liojob *lj; 305 struct proc *p; 306 int error; 307 int s; 308 309 if (aiocbe->jobstate == JOBST_NULL) 310 panic("aio_free_entry: freeing already free job"); 311 312 p = aiocbe->userproc; 313 ki = p->p_aioinfo; 314 lj = aiocbe->lio; 315 if (ki == NULL) 316 panic("aio_free_entry: missing p->p_aioinfo"); 317 318 while (aiocbe->jobstate == JOBST_JOBRUNNING) { 319 aiocbe->jobflags |= AIOCBLIST_RUNDOWN; 320 tsleep(aiocbe, 0, "jobwai", 0); 321 } 322 if (aiocbe->bp == NULL) { 323 if (ki->kaio_queue_count <= 0) 324 panic("aio_free_entry: process queue size <= 0"); 325 if (num_queue_count <= 0) 326 panic("aio_free_entry: system wide queue size <= 0"); 327 328 if (lj) { 329 lj->lioj_queue_count--; 330 if (aiocbe->jobflags & AIOCBLIST_DONE) 331 lj->lioj_queue_finished_count--; 332 } 333 ki->kaio_queue_count--; 334 if (aiocbe->jobflags & AIOCBLIST_DONE) 335 ki->kaio_queue_finished_count--; 336 num_queue_count--; 337 } else { 338 if (lj) { 339 lj->lioj_buffer_count--; 340 if (aiocbe->jobflags & AIOCBLIST_DONE) 341 lj->lioj_buffer_finished_count--; 342 } 343 if (aiocbe->jobflags & AIOCBLIST_DONE) 344 ki->kaio_buffer_finished_count--; 345 ki->kaio_buffer_count--; 346 num_buf_aio--; 347 } 348 349 /* aiocbe is going away, we need to destroy any knotes */ 350 knote_remove(p->p_thread, &aiocbe->klist); 351 352 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN) 353 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) { 354 ki->kaio_flags &= ~KAIO_WAKEUP; 355 wakeup(p); 356 } 357 358 if (aiocbe->jobstate == JOBST_JOBQBUF) { 359 if ((error = aio_fphysio(aiocbe)) != 0) 360 return error; 361 if (aiocbe->jobstate != JOBST_JOBBFINISHED) 362 panic("aio_free_entry: invalid physio finish-up state"); 363 s = splbio(); 364 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 365 splx(s); 366 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) { 367 s = splnet(); 368 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 369 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 370 splx(s); 371 } else if (aiocbe->jobstate == JOBST_JOBFINISHED) 372 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist); 373 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) { 374 s = splbio(); 375 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 376 splx(s); 377 if (aiocbe->bp) { 378 vunmapbuf(aiocbe->bp); 379 relpbuf(aiocbe->bp, NULL); 380 aiocbe->bp = NULL; 381 } 382 } 383 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) { 384 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 385 zfree(aiolio_zone, lj); 386 } 387 aiocbe->jobstate = JOBST_NULL; 388 callout_stop(&aiocbe->timeout); 389 fdrop(aiocbe->fd_file, curthread); 390 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 391 return 0; 392 } 393 #endif /* VFS_AIO */ 394 395 /* 396 * Rundown the jobs for a given process. 397 */ 398 void 399 aio_proc_rundown(struct proc *p) 400 { 401 #ifndef VFS_AIO 402 return; 403 #else 404 int s; 405 struct kaioinfo *ki; 406 struct aio_liojob *lj, *ljn; 407 struct aiocblist *aiocbe, *aiocbn; 408 struct file *fp; 409 struct socket *so; 410 411 ki = p->p_aioinfo; 412 if (ki == NULL) 413 return; 414 415 ki->kaio_flags |= LIOJ_SIGNAL_POSTED; 416 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count > 417 ki->kaio_buffer_finished_count)) { 418 ki->kaio_flags |= KAIO_RUNDOWN; 419 if (tsleep(p, 0, "kaiowt", aiod_timeout)) 420 break; 421 } 422 423 /* 424 * Move any aio ops that are waiting on socket I/O to the normal job 425 * queues so they are cleaned up with any others. 426 */ 427 s = splnet(); 428 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe = 429 aiocbn) { 430 aiocbn = TAILQ_NEXT(aiocbe, plist); 431 fp = aiocbe->fd_file; 432 if (fp != NULL) { 433 so = (struct socket *)fp->f_data; 434 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list); 435 if (TAILQ_EMPTY(&so->so_aiojobq)) { 436 so->so_snd.sb_flags &= ~SB_AIO; 437 so->so_rcv.sb_flags &= ~SB_AIO; 438 } 439 } 440 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist); 441 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list); 442 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist); 443 } 444 splx(s); 445 446 restart1: 447 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) { 448 aiocbn = TAILQ_NEXT(aiocbe, plist); 449 if (aio_free_entry(aiocbe)) 450 goto restart1; 451 } 452 453 restart2: 454 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe = 455 aiocbn) { 456 aiocbn = TAILQ_NEXT(aiocbe, plist); 457 if (aio_free_entry(aiocbe)) 458 goto restart2; 459 } 460 461 /* 462 * Note the use of lots of splbio here, trying to avoid splbio for long chains 463 * of I/O. Probably unnecessary. 464 */ 465 restart3: 466 s = splbio(); 467 while (TAILQ_FIRST(&ki->kaio_bufqueue)) { 468 ki->kaio_flags |= KAIO_WAKEUP; 469 tsleep(p, 0, "aioprn", 0); 470 splx(s); 471 goto restart3; 472 } 473 splx(s); 474 475 restart4: 476 s = splbio(); 477 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) { 478 aiocbn = TAILQ_NEXT(aiocbe, plist); 479 if (aio_free_entry(aiocbe)) { 480 splx(s); 481 goto restart4; 482 } 483 } 484 splx(s); 485 486 /* 487 * If we've slept, jobs might have moved from one queue to another. 488 * Retry rundown if we didn't manage to empty the queues. 489 */ 490 if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL || 491 TAILQ_FIRST(&ki->kaio_jobqueue) != NULL || 492 TAILQ_FIRST(&ki->kaio_bufqueue) != NULL || 493 TAILQ_FIRST(&ki->kaio_bufdone) != NULL) 494 goto restart1; 495 496 for (lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) { 497 ljn = TAILQ_NEXT(lj, lioj_list); 498 if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 499 0)) { 500 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 501 zfree(aiolio_zone, lj); 502 } else { 503 #ifdef DIAGNOSTIC 504 printf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, " 505 "QF:%d\n", lj->lioj_buffer_count, 506 lj->lioj_buffer_finished_count, 507 lj->lioj_queue_count, 508 lj->lioj_queue_finished_count); 509 #endif 510 } 511 } 512 513 zfree(kaio_zone, ki); 514 p->p_aioinfo = NULL; 515 #endif /* VFS_AIO */ 516 } 517 518 #ifdef VFS_AIO 519 /* 520 * Select a job to run (called by an AIO daemon). 521 */ 522 static struct aiocblist * 523 aio_selectjob(struct aioproclist *aiop) 524 { 525 int s; 526 struct aiocblist *aiocbe; 527 struct kaioinfo *ki; 528 struct proc *userp; 529 530 s = splnet(); 531 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe = 532 TAILQ_NEXT(aiocbe, list)) { 533 userp = aiocbe->userproc; 534 ki = userp->p_aioinfo; 535 536 if (ki->kaio_active_count < ki->kaio_maxactive_count) { 537 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 538 splx(s); 539 return aiocbe; 540 } 541 } 542 splx(s); 543 544 return NULL; 545 } 546 547 /* 548 * The AIO processing activity. This is the code that does the I/O request for 549 * the non-physio version of the operations. The normal vn operations are used, 550 * and this code should work in all instances for every type of file, including 551 * pipes, sockets, fifos, and regular files. 552 */ 553 static void 554 aio_process(struct aiocblist *aiocbe) 555 { 556 struct thread *mytd; 557 struct aiocb *cb; 558 struct file *fp; 559 struct uio auio; 560 struct iovec aiov; 561 int cnt; 562 int error; 563 int oublock_st, oublock_end; 564 int inblock_st, inblock_end; 565 566 mytd = curthread; 567 cb = &aiocbe->uaiocb; 568 fp = aiocbe->fd_file; 569 570 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; 571 aiov.iov_len = cb->aio_nbytes; 572 573 auio.uio_iov = &aiov; 574 auio.uio_iovcnt = 1; 575 auio.uio_offset = cb->aio_offset; 576 auio.uio_resid = cb->aio_nbytes; 577 cnt = cb->aio_nbytes; 578 auio.uio_segflg = UIO_USERSPACE; 579 auio.uio_td = mytd; 580 581 inblock_st = mytd->td_proc->p_stats->p_ru.ru_inblock; 582 oublock_st = mytd->td_proc->p_stats->p_ru.ru_oublock; 583 /* 584 * _aio_aqueue() acquires a reference to the file that is 585 * released in aio_free_entry(). 586 */ 587 if (cb->aio_lio_opcode == LIO_READ) { 588 auio.uio_rw = UIO_READ; 589 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, mytd); 590 } else { 591 auio.uio_rw = UIO_WRITE; 592 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, mytd); 593 } 594 inblock_end = mytd->td_proc->p_stats->p_ru.ru_inblock; 595 oublock_end = mytd->td_proc->p_stats->p_ru.ru_oublock; 596 597 aiocbe->inputcharge = inblock_end - inblock_st; 598 aiocbe->outputcharge = oublock_end - oublock_st; 599 600 if ((error) && (auio.uio_resid != cnt)) { 601 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 602 error = 0; 603 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) 604 psignal(aiocbe->userproc, SIGPIPE); 605 } 606 607 cnt -= auio.uio_resid; 608 cb->_aiocb_private.error = error; 609 cb->_aiocb_private.status = cnt; 610 } 611 612 /* 613 * The AIO daemon, most of the actual work is done in aio_process, 614 * but the setup (and address space mgmt) is done in this routine. 615 * 616 * The MP lock is held on entry. 617 */ 618 static void 619 aio_daemon(void *uproc) 620 { 621 int s; 622 struct aio_liojob *lj; 623 struct aiocb *cb; 624 struct aiocblist *aiocbe; 625 struct aioproclist *aiop; 626 struct kaioinfo *ki; 627 struct proc *curcp, *mycp, *userp; 628 struct vmspace *myvm, *tmpvm; 629 struct ucred *cr; 630 631 /* 632 * Local copies of curproc (cp) and vmspace (myvm) 633 */ 634 mycp = curproc; 635 myvm = mycp->p_vmspace; 636 637 if (mycp->p_textvp) { 638 vrele(mycp->p_textvp); 639 mycp->p_textvp = NULL; 640 } 641 642 /* 643 * Allocate and ready the aio control info. There is one aiop structure 644 * per daemon. 645 */ 646 aiop = zalloc(aiop_zone); 647 aiop->aioproc = mycp; 648 aiop->aioprocflags |= AIOP_FREE; 649 650 s = splnet(); 651 652 /* 653 * Place thread (lightweight process) onto the AIO free thread list. 654 */ 655 if (TAILQ_EMPTY(&aio_freeproc)) 656 wakeup(&aio_freeproc); 657 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 658 659 splx(s); 660 661 /* Make up a name for the daemon. */ 662 strcpy(mycp->p_comm, "aiod"); 663 664 /* 665 * Get rid of our current filedescriptors. AIOD's don't need any 666 * filedescriptors, except as temporarily inherited from the client. 667 * Credentials are also cloned, and made equivalent to "root". 668 */ 669 fdfree(mycp); 670 mycp->p_fd = NULL; 671 cr = cratom(&mycp->p_ucred); 672 cr->cr_uid = 0; 673 uireplace(&cr->cr_uidinfo, uifind(0)); 674 cr->cr_ngroups = 1; 675 cr->cr_groups[0] = 1; 676 677 /* The daemon resides in its own pgrp. */ 678 enterpgrp(mycp, mycp->p_pid, 1); 679 680 /* Mark special process type. */ 681 mycp->p_flag |= P_SYSTEM | P_KTHREADP; 682 683 /* 684 * Wakeup parent process. (Parent sleeps to keep from blasting away 685 * and creating too many daemons.) 686 */ 687 wakeup(mycp); 688 689 for (;;) { 690 /* 691 * curcp is the current daemon process context. 692 * userp is the current user process context. 693 */ 694 curcp = mycp; 695 696 /* 697 * Take daemon off of free queue 698 */ 699 if (aiop->aioprocflags & AIOP_FREE) { 700 s = splnet(); 701 TAILQ_REMOVE(&aio_freeproc, aiop, list); 702 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 703 aiop->aioprocflags &= ~AIOP_FREE; 704 splx(s); 705 } 706 aiop->aioprocflags &= ~AIOP_SCHED; 707 708 /* 709 * Check for jobs. 710 */ 711 while ((aiocbe = aio_selectjob(aiop)) != NULL) { 712 cb = &aiocbe->uaiocb; 713 userp = aiocbe->userproc; 714 715 aiocbe->jobstate = JOBST_JOBRUNNING; 716 717 /* 718 * Connect to process address space for user program. 719 */ 720 if (userp != curcp) { 721 /* 722 * Save the current address space that we are 723 * connected to. 724 */ 725 tmpvm = mycp->p_vmspace; 726 727 /* 728 * Point to the new user address space, and 729 * refer to it. 730 */ 731 mycp->p_vmspace = userp->p_vmspace; 732 mycp->p_vmspace->vm_refcnt++; 733 734 /* Activate the new mapping. */ 735 pmap_activate(mycp); 736 737 /* 738 * If the old address space wasn't the daemons 739 * own address space, then we need to remove the 740 * daemon's reference from the other process 741 * that it was acting on behalf of. 742 */ 743 if (tmpvm != myvm) { 744 vmspace_free(tmpvm); 745 } 746 curcp = userp; 747 } 748 749 ki = userp->p_aioinfo; 750 lj = aiocbe->lio; 751 752 /* Account for currently active jobs. */ 753 ki->kaio_active_count++; 754 755 /* Do the I/O function. */ 756 aio_process(aiocbe); 757 758 /* Decrement the active job count. */ 759 ki->kaio_active_count--; 760 761 /* 762 * Increment the completion count for wakeup/signal 763 * comparisons. 764 */ 765 aiocbe->jobflags |= AIOCBLIST_DONE; 766 ki->kaio_queue_finished_count++; 767 if (lj) 768 lj->lioj_queue_finished_count++; 769 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags 770 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) { 771 ki->kaio_flags &= ~KAIO_WAKEUP; 772 wakeup(userp); 773 } 774 775 s = splbio(); 776 if (lj && (lj->lioj_flags & 777 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) { 778 if ((lj->lioj_queue_finished_count == 779 lj->lioj_queue_count) && 780 (lj->lioj_buffer_finished_count == 781 lj->lioj_buffer_count)) { 782 psignal(userp, 783 lj->lioj_signal.sigev_signo); 784 lj->lioj_flags |= 785 LIOJ_SIGNAL_POSTED; 786 } 787 } 788 splx(s); 789 790 aiocbe->jobstate = JOBST_JOBFINISHED; 791 792 s = splnet(); 793 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 794 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist); 795 splx(s); 796 KNOTE(&aiocbe->klist, 0); 797 798 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) { 799 wakeup(aiocbe); 800 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN; 801 } 802 803 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 804 psignal(userp, cb->aio_sigevent.sigev_signo); 805 } 806 } 807 808 /* 809 * Disconnect from user address space. 810 */ 811 if (curcp != mycp) { 812 /* Get the user address space to disconnect from. */ 813 tmpvm = mycp->p_vmspace; 814 815 /* Get original address space for daemon. */ 816 mycp->p_vmspace = myvm; 817 818 /* Activate the daemon's address space. */ 819 pmap_activate(mycp); 820 #ifdef DIAGNOSTIC 821 if (tmpvm == myvm) { 822 printf("AIOD: vmspace problem -- %d\n", 823 mycp->p_pid); 824 } 825 #endif 826 /* Remove our vmspace reference. */ 827 vmspace_free(tmpvm); 828 829 curcp = mycp; 830 } 831 832 /* 833 * If we are the first to be put onto the free queue, wakeup 834 * anyone waiting for a daemon. 835 */ 836 s = splnet(); 837 TAILQ_REMOVE(&aio_activeproc, aiop, list); 838 if (TAILQ_EMPTY(&aio_freeproc)) 839 wakeup(&aio_freeproc); 840 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 841 aiop->aioprocflags |= AIOP_FREE; 842 splx(s); 843 844 /* 845 * If daemon is inactive for a long time, allow it to exit, 846 * thereby freeing resources. 847 */ 848 if (((aiop->aioprocflags & AIOP_SCHED) == 0) && tsleep(mycp, 849 0, "aiordy", aiod_lifetime)) { 850 s = splnet(); 851 if (TAILQ_EMPTY(&aio_jobs)) { 852 if ((aiop->aioprocflags & AIOP_FREE) && 853 (num_aio_procs > target_aio_procs)) { 854 TAILQ_REMOVE(&aio_freeproc, aiop, list); 855 splx(s); 856 zfree(aiop_zone, aiop); 857 num_aio_procs--; 858 #ifdef DIAGNOSTIC 859 if (mycp->p_vmspace->vm_refcnt <= 1) { 860 printf("AIOD: bad vm refcnt for" 861 " exiting daemon: %d\n", 862 mycp->p_vmspace->vm_refcnt); 863 } 864 #endif 865 exit1(0); 866 } 867 } 868 splx(s); 869 } 870 } 871 } 872 873 /* 874 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 875 * AIO daemon modifies its environment itself. 876 */ 877 static int 878 aio_newproc() 879 { 880 int error; 881 struct proc *p, *np; 882 883 p = &proc0; 884 error = fork1(p, RFPROC|RFMEM|RFNOWAIT, &np); 885 if (error) 886 return error; 887 cpu_set_fork_handler(np, aio_daemon, curproc); 888 start_forked_proc(p, np); 889 890 /* 891 * Wait until daemon is started, but continue on just in case to 892 * handle error conditions. 893 */ 894 error = tsleep(np, 0, "aiosta", aiod_timeout); 895 num_aio_procs++; 896 897 return error; 898 } 899 900 /* 901 * Try the high-performance, low-overhead physio method for eligible 902 * VCHR devices. This method doesn't use an aio helper thread, and 903 * thus has very low overhead. 904 * 905 * Assumes that the caller, _aio_aqueue(), has incremented the file 906 * structure's reference count, preventing its deallocation for the 907 * duration of this call. 908 */ 909 static int 910 aio_qphysio(struct proc *p, struct aiocblist *aiocbe) 911 { 912 int error; 913 struct aiocb *cb; 914 struct file *fp; 915 struct buf *bp; 916 struct vnode *vp; 917 struct kaioinfo *ki; 918 struct aio_liojob *lj; 919 int s; 920 int notify; 921 922 cb = &aiocbe->uaiocb; 923 fp = aiocbe->fd_file; 924 925 if (fp->f_type != DTYPE_VNODE) 926 return (-1); 927 928 vp = (struct vnode *)fp->f_data; 929 930 /* 931 * If its not a disk, we don't want to return a positive error. 932 * It causes the aio code to not fall through to try the thread 933 * way when you're talking to a regular file. 934 */ 935 if (!vn_isdisk(vp, &error)) { 936 if (error == ENOTBLK) 937 return (-1); 938 else 939 return (error); 940 } 941 942 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys) 943 return (-1); 944 945 if (cb->aio_nbytes > 946 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK)) 947 return (-1); 948 949 ki = p->p_aioinfo; 950 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) 951 return (-1); 952 953 ki->kaio_buffer_count++; 954 955 lj = aiocbe->lio; 956 if (lj) 957 lj->lioj_buffer_count++; 958 959 /* Create and build a buffer header for a transfer. */ 960 bp = (struct buf *)getpbuf(NULL); 961 BUF_KERNPROC(bp); 962 963 /* 964 * Get a copy of the kva from the physical buffer. 965 */ 966 bp->b_caller1 = p; 967 bp->b_dev = vp->v_rdev; 968 error = 0; 969 970 bp->b_bcount = cb->aio_nbytes; 971 bp->b_bufsize = cb->aio_nbytes; 972 bp->b_flags = B_PHYS | B_CALL | (cb->aio_lio_opcode == LIO_WRITE ? 973 B_WRITE : B_READ); 974 bp->b_iodone = aio_physwakeup; 975 bp->b_saveaddr = bp->b_data; 976 bp->b_data = (void *)(uintptr_t)cb->aio_buf; 977 bp->b_blkno = btodb(cb->aio_offset); 978 979 /* Bring buffer into kernel space. */ 980 if (vmapbuf(bp) < 0) { 981 error = EFAULT; 982 goto doerror; 983 } 984 985 s = splbio(); 986 aiocbe->bp = bp; 987 bp->b_spc = (void *)aiocbe; 988 TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list); 989 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); 990 aiocbe->jobstate = JOBST_JOBQBUF; 991 cb->_aiocb_private.status = cb->aio_nbytes; 992 num_buf_aio++; 993 bp->b_error = 0; 994 995 splx(s); 996 997 /* Perform transfer. */ 998 BUF_STRATEGY(bp, 0); 999 1000 notify = 0; 1001 s = splbio(); 1002 1003 /* 1004 * If we had an error invoking the request, or an error in processing 1005 * the request before we have returned, we process it as an error in 1006 * transfer. Note that such an I/O error is not indicated immediately, 1007 * but is returned using the aio_error mechanism. In this case, 1008 * aio_suspend will return immediately. 1009 */ 1010 if (bp->b_error || (bp->b_flags & B_ERROR)) { 1011 struct aiocb *job = aiocbe->uuaiocb; 1012 1013 aiocbe->uaiocb._aiocb_private.status = 0; 1014 suword(&job->_aiocb_private.status, 0); 1015 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 1016 suword(&job->_aiocb_private.error, bp->b_error); 1017 1018 ki->kaio_buffer_finished_count++; 1019 1020 if (aiocbe->jobstate != JOBST_JOBBFINISHED) { 1021 aiocbe->jobstate = JOBST_JOBBFINISHED; 1022 aiocbe->jobflags |= AIOCBLIST_DONE; 1023 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 1024 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 1025 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 1026 notify = 1; 1027 } 1028 } 1029 splx(s); 1030 if (notify) 1031 KNOTE(&aiocbe->klist, 0); 1032 return 0; 1033 1034 doerror: 1035 ki->kaio_buffer_count--; 1036 if (lj) 1037 lj->lioj_buffer_count--; 1038 aiocbe->bp = NULL; 1039 relpbuf(bp, NULL); 1040 return error; 1041 } 1042 1043 /* 1044 * This waits/tests physio completion. 1045 */ 1046 static int 1047 aio_fphysio(struct aiocblist *iocb) 1048 { 1049 int s; 1050 struct buf *bp; 1051 int error; 1052 1053 bp = iocb->bp; 1054 1055 s = splbio(); 1056 while ((bp->b_flags & B_DONE) == 0) { 1057 if (tsleep(bp, 0, "physstr", aiod_timeout)) { 1058 if ((bp->b_flags & B_DONE) == 0) { 1059 splx(s); 1060 return EINPROGRESS; 1061 } else 1062 break; 1063 } 1064 } 1065 splx(s); 1066 1067 /* Release mapping into kernel space. */ 1068 vunmapbuf(bp); 1069 iocb->bp = 0; 1070 1071 error = 0; 1072 1073 /* Check for an error. */ 1074 if (bp->b_flags & B_ERROR) 1075 error = bp->b_error; 1076 1077 relpbuf(bp, NULL); 1078 return (error); 1079 } 1080 #endif /* VFS_AIO */ 1081 1082 /* 1083 * Wake up aio requests that may be serviceable now. 1084 */ 1085 void 1086 aio_swake(struct socket *so, struct sockbuf *sb) 1087 { 1088 #ifndef VFS_AIO 1089 return; 1090 #else 1091 struct aiocblist *cb,*cbn; 1092 struct proc *p; 1093 struct kaioinfo *ki = NULL; 1094 int opcode, wakecount = 0; 1095 struct aioproclist *aiop; 1096 1097 if (sb == &so->so_snd) { 1098 opcode = LIO_WRITE; 1099 so->so_snd.sb_flags &= ~SB_AIO; 1100 } else { 1101 opcode = LIO_READ; 1102 so->so_rcv.sb_flags &= ~SB_AIO; 1103 } 1104 1105 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) { 1106 cbn = TAILQ_NEXT(cb, list); 1107 if (opcode == cb->uaiocb.aio_lio_opcode) { 1108 p = cb->userproc; 1109 ki = p->p_aioinfo; 1110 TAILQ_REMOVE(&so->so_aiojobq, cb, list); 1111 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist); 1112 TAILQ_INSERT_TAIL(&aio_jobs, cb, list); 1113 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist); 1114 wakecount++; 1115 if (cb->jobstate != JOBST_JOBQGLOBAL) 1116 panic("invalid queue value"); 1117 } 1118 } 1119 1120 while (wakecount--) { 1121 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) { 1122 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1123 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1124 aiop->aioprocflags &= ~AIOP_FREE; 1125 wakeup(aiop->aioproc); 1126 } 1127 } 1128 #endif /* VFS_AIO */ 1129 } 1130 1131 #ifdef VFS_AIO 1132 /* 1133 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR 1134 * technique is done in this code. 1135 */ 1136 static int 1137 _aio_aqueue(struct aiocb *job, struct aio_liojob *lj, int type) 1138 { 1139 struct proc *p = curproc; 1140 struct filedesc *fdp; 1141 struct file *fp; 1142 unsigned int fd; 1143 struct socket *so; 1144 int s; 1145 int error; 1146 int opcode, user_opcode; 1147 struct aiocblist *aiocbe; 1148 struct aioproclist *aiop; 1149 struct kaioinfo *ki; 1150 struct kevent kev; 1151 struct kqueue *kq; 1152 struct file *kq_fp; 1153 1154 if ((aiocbe = TAILQ_FIRST(&aio_freejobs)) != NULL) 1155 TAILQ_REMOVE(&aio_freejobs, aiocbe, list); 1156 else 1157 aiocbe = zalloc (aiocb_zone); 1158 1159 aiocbe->inputcharge = 0; 1160 aiocbe->outputcharge = 0; 1161 callout_init(&aiocbe->timeout); 1162 SLIST_INIT(&aiocbe->klist); 1163 1164 suword(&job->_aiocb_private.status, -1); 1165 suword(&job->_aiocb_private.error, 0); 1166 suword(&job->_aiocb_private.kernelinfo, -1); 1167 1168 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb)); 1169 if (error) { 1170 suword(&job->_aiocb_private.error, error); 1171 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1172 return error; 1173 } 1174 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL && 1175 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) { 1176 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1177 return EINVAL; 1178 } 1179 1180 /* Save userspace address of the job info. */ 1181 aiocbe->uuaiocb = job; 1182 1183 /* Get the opcode. */ 1184 user_opcode = aiocbe->uaiocb.aio_lio_opcode; 1185 if (type != LIO_NOP) 1186 aiocbe->uaiocb.aio_lio_opcode = type; 1187 opcode = aiocbe->uaiocb.aio_lio_opcode; 1188 1189 /* Get the fd info for process. */ 1190 fdp = p->p_fd; 1191 1192 /* 1193 * Range check file descriptor. 1194 */ 1195 fd = aiocbe->uaiocb.aio_fildes; 1196 if (fd >= fdp->fd_nfiles) { 1197 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1198 if (type == 0) 1199 suword(&job->_aiocb_private.error, EBADF); 1200 return EBADF; 1201 } 1202 1203 fp = aiocbe->fd_file = fdp->fd_ofiles[fd]; 1204 if ((fp == NULL) || ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) == 1205 0))) { 1206 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1207 if (type == 0) 1208 suword(&job->_aiocb_private.error, EBADF); 1209 return EBADF; 1210 } 1211 fhold(fp); 1212 1213 if (aiocbe->uaiocb.aio_offset == -1LL) { 1214 error = EINVAL; 1215 goto aqueue_fail; 1216 } 1217 error = suword(&job->_aiocb_private.kernelinfo, jobrefid); 1218 if (error) { 1219 error = EINVAL; 1220 goto aqueue_fail; 1221 } 1222 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid; 1223 if (jobrefid == LONG_MAX) 1224 jobrefid = 1; 1225 else 1226 jobrefid++; 1227 1228 if (opcode == LIO_NOP) { 1229 fdrop(fp, p->p_thread); 1230 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1231 if (type == 0) { 1232 suword(&job->_aiocb_private.error, 0); 1233 suword(&job->_aiocb_private.status, 0); 1234 suword(&job->_aiocb_private.kernelinfo, 0); 1235 } 1236 return 0; 1237 } 1238 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) { 1239 if (type == 0) 1240 suword(&job->_aiocb_private.status, 0); 1241 error = EINVAL; 1242 goto aqueue_fail; 1243 } 1244 1245 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) { 1246 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue; 1247 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr; 1248 } 1249 else { 1250 /* 1251 * This method for requesting kevent-based notification won't 1252 * work on the alpha, since we're passing in a pointer 1253 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT- 1254 * based method instead. 1255 */ 1256 if (user_opcode == LIO_NOP || user_opcode == LIO_READ || 1257 user_opcode == LIO_WRITE) 1258 goto no_kqueue; 1259 1260 error = copyin((struct kevent *)(uintptr_t)user_opcode, 1261 &kev, sizeof(kev)); 1262 if (error) 1263 goto aqueue_fail; 1264 } 1265 if ((u_int)kev.ident >= fdp->fd_nfiles || 1266 (kq_fp = fdp->fd_ofiles[kev.ident]) == NULL || 1267 (kq_fp->f_type != DTYPE_KQUEUE)) { 1268 error = EBADF; 1269 goto aqueue_fail; 1270 } 1271 kq = (struct kqueue *)kq_fp->f_data; 1272 kev.ident = (uintptr_t)aiocbe->uuaiocb; 1273 kev.filter = EVFILT_AIO; 1274 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 1275 kev.data = (intptr_t)aiocbe; 1276 error = kqueue_register(kq, &kev, p->p_thread); 1277 aqueue_fail: 1278 if (error) { 1279 fdrop(fp, p->p_thread); 1280 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1281 if (type == 0) 1282 suword(&job->_aiocb_private.error, error); 1283 goto done; 1284 } 1285 no_kqueue: 1286 1287 suword(&job->_aiocb_private.error, EINPROGRESS); 1288 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; 1289 aiocbe->userproc = p; 1290 aiocbe->jobflags = 0; 1291 aiocbe->lio = lj; 1292 ki = p->p_aioinfo; 1293 1294 if (fp->f_type == DTYPE_SOCKET) { 1295 /* 1296 * Alternate queueing for socket ops: Reach down into the 1297 * descriptor to get the socket data. Then check to see if the 1298 * socket is ready to be read or written (based on the requested 1299 * operation). 1300 * 1301 * If it is not ready for io, then queue the aiocbe on the 1302 * socket, and set the flags so we get a call when sbnotify() 1303 * happens. 1304 */ 1305 so = (struct socket *)fp->f_data; 1306 s = splnet(); 1307 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode == 1308 LIO_WRITE) && (!sowriteable(so)))) { 1309 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list); 1310 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist); 1311 if (opcode == LIO_READ) 1312 so->so_rcv.sb_flags |= SB_AIO; 1313 else 1314 so->so_snd.sb_flags |= SB_AIO; 1315 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */ 1316 ki->kaio_queue_count++; 1317 num_queue_count++; 1318 splx(s); 1319 error = 0; 1320 goto done; 1321 } 1322 splx(s); 1323 } 1324 1325 if ((error = aio_qphysio(p, aiocbe)) == 0) 1326 goto done; 1327 if (error > 0) { 1328 suword(&job->_aiocb_private.status, 0); 1329 aiocbe->uaiocb._aiocb_private.error = error; 1330 suword(&job->_aiocb_private.error, error); 1331 goto done; 1332 } 1333 1334 /* No buffer for daemon I/O. */ 1335 aiocbe->bp = NULL; 1336 1337 ki->kaio_queue_count++; 1338 if (lj) 1339 lj->lioj_queue_count++; 1340 s = splnet(); 1341 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); 1342 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); 1343 splx(s); 1344 aiocbe->jobstate = JOBST_JOBQGLOBAL; 1345 1346 num_queue_count++; 1347 error = 0; 1348 1349 /* 1350 * If we don't have a free AIO process, and we are below our quota, then 1351 * start one. Otherwise, depend on the subsequent I/O completions to 1352 * pick-up this job. If we don't successfully create the new process 1353 * (thread) due to resource issues, we return an error for now (EAGAIN), 1354 * which is likely not the correct thing to do. 1355 */ 1356 s = splnet(); 1357 retryproc: 1358 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1359 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1360 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1361 aiop->aioprocflags &= ~AIOP_FREE; 1362 wakeup(aiop->aioproc); 1363 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && 1364 ((ki->kaio_active_count + num_aio_resv_start) < 1365 ki->kaio_maxactive_count)) { 1366 num_aio_resv_start++; 1367 if ((error = aio_newproc()) == 0) { 1368 num_aio_resv_start--; 1369 goto retryproc; 1370 } 1371 num_aio_resv_start--; 1372 } 1373 splx(s); 1374 done: 1375 return error; 1376 } 1377 1378 /* 1379 * This routine queues an AIO request, checking for quotas. 1380 */ 1381 static int 1382 aio_aqueue(struct aiocb *job, int type) 1383 { 1384 struct proc *p = curproc; 1385 struct kaioinfo *ki; 1386 1387 if (p->p_aioinfo == NULL) 1388 aio_init_aioinfo(p); 1389 1390 if (num_queue_count >= max_queue_count) 1391 return EAGAIN; 1392 1393 ki = p->p_aioinfo; 1394 if (ki->kaio_queue_count >= ki->kaio_qallowed_count) 1395 return EAGAIN; 1396 1397 return _aio_aqueue(job, NULL, type); 1398 } 1399 #endif /* VFS_AIO */ 1400 1401 /* 1402 * Support the aio_return system call, as a side-effect, kernel resources are 1403 * released. 1404 */ 1405 int 1406 aio_return(struct aio_return_args *uap) 1407 { 1408 #ifndef VFS_AIO 1409 return ENOSYS; 1410 #else 1411 struct proc *p = curproc; 1412 int s; 1413 long jobref; 1414 struct aiocblist *cb, *ncb; 1415 struct aiocb *ujob; 1416 struct kaioinfo *ki; 1417 1418 ki = p->p_aioinfo; 1419 if (ki == NULL) 1420 return EINVAL; 1421 1422 ujob = uap->aiocbp; 1423 1424 jobref = fuword(&ujob->_aiocb_private.kernelinfo); 1425 if (jobref == -1 || jobref == 0) 1426 return EINVAL; 1427 1428 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1429 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == 1430 jobref) { 1431 if (ujob == cb->uuaiocb) { 1432 uap->sysmsg_result = 1433 cb->uaiocb._aiocb_private.status; 1434 } else 1435 uap->sysmsg_result = EFAULT; 1436 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 1437 p->p_stats->p_ru.ru_oublock += 1438 cb->outputcharge; 1439 cb->outputcharge = 0; 1440 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 1441 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 1442 cb->inputcharge = 0; 1443 } 1444 aio_free_entry(cb); 1445 return 0; 1446 } 1447 } 1448 s = splbio(); 1449 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) { 1450 ncb = TAILQ_NEXT(cb, plist); 1451 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) 1452 == jobref) { 1453 splx(s); 1454 if (ujob == cb->uuaiocb) { 1455 uap->sysmsg_result = 1456 cb->uaiocb._aiocb_private.status; 1457 } else 1458 uap->sysmsg_result = EFAULT; 1459 aio_free_entry(cb); 1460 return 0; 1461 } 1462 } 1463 splx(s); 1464 1465 return (EINVAL); 1466 #endif /* VFS_AIO */ 1467 } 1468 1469 /* 1470 * Allow a process to wakeup when any of the I/O requests are completed. 1471 */ 1472 int 1473 aio_suspend(struct aio_suspend_args *uap) 1474 { 1475 #ifndef VFS_AIO 1476 return ENOSYS; 1477 #else 1478 struct proc *p = curproc; 1479 struct timeval atv; 1480 struct timespec ts; 1481 struct aiocb *const *cbptr, *cbp; 1482 struct kaioinfo *ki; 1483 struct aiocblist *cb; 1484 int i; 1485 int njoblist; 1486 int error, s, timo; 1487 long *ijoblist; 1488 struct aiocb **ujoblist; 1489 1490 if (uap->nent > AIO_LISTIO_MAX) 1491 return EINVAL; 1492 1493 timo = 0; 1494 if (uap->timeout) { 1495 /* Get timespec struct. */ 1496 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 1497 return error; 1498 1499 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) 1500 return (EINVAL); 1501 1502 TIMESPEC_TO_TIMEVAL(&atv, &ts); 1503 if (itimerfix(&atv)) 1504 return (EINVAL); 1505 timo = tvtohz_high(&atv); 1506 } 1507 1508 ki = p->p_aioinfo; 1509 if (ki == NULL) 1510 return EAGAIN; 1511 1512 njoblist = 0; 1513 ijoblist = zalloc(aiol_zone); 1514 ujoblist = zalloc(aiol_zone); 1515 cbptr = uap->aiocbp; 1516 1517 for (i = 0; i < uap->nent; i++) { 1518 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1519 if (cbp == 0) 1520 continue; 1521 ujoblist[njoblist] = cbp; 1522 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo); 1523 njoblist++; 1524 } 1525 1526 if (njoblist == 0) { 1527 zfree(aiol_zone, ijoblist); 1528 zfree(aiol_zone, ujoblist); 1529 return 0; 1530 } 1531 1532 error = 0; 1533 for (;;) { 1534 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1535 for (i = 0; i < njoblist; i++) { 1536 if (((intptr_t) 1537 cb->uaiocb._aiocb_private.kernelinfo) == 1538 ijoblist[i]) { 1539 if (ujoblist[i] != cb->uuaiocb) 1540 error = EINVAL; 1541 zfree(aiol_zone, ijoblist); 1542 zfree(aiol_zone, ujoblist); 1543 return error; 1544 } 1545 } 1546 } 1547 1548 s = splbio(); 1549 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = 1550 TAILQ_NEXT(cb, plist)) { 1551 for (i = 0; i < njoblist; i++) { 1552 if (((intptr_t) 1553 cb->uaiocb._aiocb_private.kernelinfo) == 1554 ijoblist[i]) { 1555 splx(s); 1556 if (ujoblist[i] != cb->uuaiocb) 1557 error = EINVAL; 1558 zfree(aiol_zone, ijoblist); 1559 zfree(aiol_zone, ujoblist); 1560 return error; 1561 } 1562 } 1563 } 1564 1565 ki->kaio_flags |= KAIO_WAKEUP; 1566 error = tsleep(p, PCATCH, "aiospn", timo); 1567 splx(s); 1568 1569 if (error == ERESTART || error == EINTR) { 1570 zfree(aiol_zone, ijoblist); 1571 zfree(aiol_zone, ujoblist); 1572 return EINTR; 1573 } else if (error == EWOULDBLOCK) { 1574 zfree(aiol_zone, ijoblist); 1575 zfree(aiol_zone, ujoblist); 1576 return EAGAIN; 1577 } 1578 } 1579 1580 /* NOTREACHED */ 1581 return EINVAL; 1582 #endif /* VFS_AIO */ 1583 } 1584 1585 /* 1586 * aio_cancel cancels any non-physio aio operations not currently in 1587 * progress. 1588 */ 1589 int 1590 aio_cancel(struct aio_cancel_args *uap) 1591 { 1592 #ifndef VFS_AIO 1593 return ENOSYS; 1594 #else 1595 struct proc *p = curproc; 1596 struct kaioinfo *ki; 1597 struct aiocblist *cbe, *cbn; 1598 struct file *fp; 1599 struct filedesc *fdp; 1600 struct socket *so; 1601 struct proc *po; 1602 int s,error; 1603 int cancelled=0; 1604 int notcancelled=0; 1605 struct vnode *vp; 1606 1607 fdp = p->p_fd; 1608 if ((u_int)uap->fd >= fdp->fd_nfiles || 1609 (fp = fdp->fd_ofiles[uap->fd]) == NULL) 1610 return (EBADF); 1611 1612 if (fp->f_type == DTYPE_VNODE) { 1613 vp = (struct vnode *)fp->f_data; 1614 1615 if (vn_isdisk(vp,&error)) { 1616 uap->sysmsg_result = AIO_NOTCANCELED; 1617 return 0; 1618 } 1619 } else if (fp->f_type == DTYPE_SOCKET) { 1620 so = (struct socket *)fp->f_data; 1621 1622 s = splnet(); 1623 1624 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) { 1625 cbn = TAILQ_NEXT(cbe, list); 1626 if ((uap->aiocbp == NULL) || 1627 (uap->aiocbp == cbe->uuaiocb) ) { 1628 po = cbe->userproc; 1629 ki = po->p_aioinfo; 1630 TAILQ_REMOVE(&so->so_aiojobq, cbe, list); 1631 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist); 1632 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist); 1633 if (ki->kaio_flags & KAIO_WAKEUP) { 1634 wakeup(po); 1635 } 1636 cbe->jobstate = JOBST_JOBFINISHED; 1637 cbe->uaiocb._aiocb_private.status=-1; 1638 cbe->uaiocb._aiocb_private.error=ECANCELED; 1639 cancelled++; 1640 /* XXX cancelled, knote? */ 1641 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1642 SIGEV_SIGNAL) 1643 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1644 if (uap->aiocbp) 1645 break; 1646 } 1647 } 1648 splx(s); 1649 1650 if ((cancelled) && (uap->aiocbp)) { 1651 uap->sysmsg_result = AIO_CANCELED; 1652 return 0; 1653 } 1654 } 1655 ki=p->p_aioinfo; 1656 if (ki == NULL) 1657 goto done; 1658 s = splnet(); 1659 1660 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) { 1661 cbn = TAILQ_NEXT(cbe, plist); 1662 1663 if ((uap->fd == cbe->uaiocb.aio_fildes) && 1664 ((uap->aiocbp == NULL ) || 1665 (uap->aiocbp == cbe->uuaiocb))) { 1666 1667 if (cbe->jobstate == JOBST_JOBQGLOBAL) { 1668 TAILQ_REMOVE(&aio_jobs, cbe, list); 1669 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); 1670 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, 1671 plist); 1672 cancelled++; 1673 ki->kaio_queue_finished_count++; 1674 cbe->jobstate = JOBST_JOBFINISHED; 1675 cbe->uaiocb._aiocb_private.status = -1; 1676 cbe->uaiocb._aiocb_private.error = ECANCELED; 1677 /* XXX cancelled, knote? */ 1678 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1679 SIGEV_SIGNAL) 1680 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1681 } else { 1682 notcancelled++; 1683 } 1684 } 1685 } 1686 splx(s); 1687 done: 1688 if (notcancelled) { 1689 uap->sysmsg_result = AIO_NOTCANCELED; 1690 return 0; 1691 } 1692 if (cancelled) { 1693 uap->sysmsg_result = AIO_CANCELED; 1694 return 0; 1695 } 1696 uap->sysmsg_result = AIO_ALLDONE; 1697 1698 return 0; 1699 #endif /* VFS_AIO */ 1700 } 1701 1702 /* 1703 * aio_error is implemented in the kernel level for compatibility purposes only. 1704 * For a user mode async implementation, it would be best to do it in a userland 1705 * subroutine. 1706 */ 1707 int 1708 aio_error(struct aio_error_args *uap) 1709 { 1710 #ifndef VFS_AIO 1711 return ENOSYS; 1712 #else 1713 struct proc *p = curproc; 1714 int s; 1715 struct aiocblist *cb; 1716 struct kaioinfo *ki; 1717 long jobref; 1718 1719 ki = p->p_aioinfo; 1720 if (ki == NULL) 1721 return EINVAL; 1722 1723 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo); 1724 if ((jobref == -1) || (jobref == 0)) 1725 return EINVAL; 1726 1727 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1728 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1729 jobref) { 1730 uap->sysmsg_result = cb->uaiocb._aiocb_private.error; 1731 return 0; 1732 } 1733 } 1734 1735 s = splnet(); 1736 1737 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb, 1738 plist)) { 1739 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1740 jobref) { 1741 uap->sysmsg_result = EINPROGRESS; 1742 splx(s); 1743 return 0; 1744 } 1745 } 1746 1747 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb, 1748 plist)) { 1749 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1750 jobref) { 1751 uap->sysmsg_result = EINPROGRESS; 1752 splx(s); 1753 return 0; 1754 } 1755 } 1756 splx(s); 1757 1758 s = splbio(); 1759 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, 1760 plist)) { 1761 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1762 jobref) { 1763 uap->sysmsg_result = cb->uaiocb._aiocb_private.error; 1764 splx(s); 1765 return 0; 1766 } 1767 } 1768 1769 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb, 1770 plist)) { 1771 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1772 jobref) { 1773 uap->sysmsg_result = EINPROGRESS; 1774 splx(s); 1775 return 0; 1776 } 1777 } 1778 splx(s); 1779 1780 #if (0) 1781 /* 1782 * Hack for lio. 1783 */ 1784 status = fuword(&uap->aiocbp->_aiocb_private.status); 1785 if (status == -1) 1786 return fuword(&uap->aiocbp->_aiocb_private.error); 1787 #endif 1788 return EINVAL; 1789 #endif /* VFS_AIO */ 1790 } 1791 1792 /* syscall - asynchronous read from a file (REALTIME) */ 1793 int 1794 aio_read(struct aio_read_args *uap) 1795 { 1796 #ifndef VFS_AIO 1797 return ENOSYS; 1798 #else 1799 return aio_aqueue(uap->aiocbp, LIO_READ); 1800 #endif /* VFS_AIO */ 1801 } 1802 1803 /* syscall - asynchronous write to a file (REALTIME) */ 1804 int 1805 aio_write(struct aio_write_args *uap) 1806 { 1807 #ifndef VFS_AIO 1808 return ENOSYS; 1809 #else 1810 return aio_aqueue(uap->aiocbp, LIO_WRITE); 1811 #endif /* VFS_AIO */ 1812 } 1813 1814 /* syscall - XXX undocumented */ 1815 int 1816 lio_listio(struct lio_listio_args *uap) 1817 { 1818 #ifndef VFS_AIO 1819 return ENOSYS; 1820 #else 1821 struct proc *p = curproc; 1822 int nent, nentqueued; 1823 struct aiocb *iocb, * const *cbptr; 1824 struct aiocblist *cb; 1825 struct kaioinfo *ki; 1826 struct aio_liojob *lj; 1827 int error, runningcode; 1828 int nerror; 1829 int i; 1830 int s; 1831 1832 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 1833 return EINVAL; 1834 1835 nent = uap->nent; 1836 if (nent > AIO_LISTIO_MAX) 1837 return EINVAL; 1838 1839 if (p->p_aioinfo == NULL) 1840 aio_init_aioinfo(p); 1841 1842 if ((nent + num_queue_count) > max_queue_count) 1843 return EAGAIN; 1844 1845 ki = p->p_aioinfo; 1846 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) 1847 return EAGAIN; 1848 1849 lj = zalloc(aiolio_zone); 1850 if (!lj) 1851 return EAGAIN; 1852 1853 lj->lioj_flags = 0; 1854 lj->lioj_buffer_count = 0; 1855 lj->lioj_buffer_finished_count = 0; 1856 lj->lioj_queue_count = 0; 1857 lj->lioj_queue_finished_count = 0; 1858 lj->lioj_ki = ki; 1859 1860 /* 1861 * Setup signal. 1862 */ 1863 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 1864 error = copyin(uap->sig, &lj->lioj_signal, 1865 sizeof(lj->lioj_signal)); 1866 if (error) { 1867 zfree(aiolio_zone, lj); 1868 return error; 1869 } 1870 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 1871 zfree(aiolio_zone, lj); 1872 return EINVAL; 1873 } 1874 lj->lioj_flags |= LIOJ_SIGNAL; 1875 lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED; 1876 } else 1877 lj->lioj_flags &= ~LIOJ_SIGNAL; 1878 1879 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 1880 /* 1881 * Get pointers to the list of I/O requests. 1882 */ 1883 nerror = 0; 1884 nentqueued = 0; 1885 cbptr = uap->acb_list; 1886 for (i = 0; i < uap->nent; i++) { 1887 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1888 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) { 1889 error = _aio_aqueue(iocb, lj, 0); 1890 if (error == 0) 1891 nentqueued++; 1892 else 1893 nerror++; 1894 } 1895 } 1896 1897 /* 1898 * If we haven't queued any, then just return error. 1899 */ 1900 if (nentqueued == 0) 1901 return 0; 1902 1903 /* 1904 * Calculate the appropriate error return. 1905 */ 1906 runningcode = 0; 1907 if (nerror) 1908 runningcode = EIO; 1909 1910 if (uap->mode == LIO_WAIT) { 1911 int command, found, jobref; 1912 1913 for (;;) { 1914 found = 0; 1915 for (i = 0; i < uap->nent; i++) { 1916 /* 1917 * Fetch address of the control buf pointer in 1918 * user space. 1919 */ 1920 iocb = (struct aiocb *) 1921 (intptr_t)fuword(&cbptr[i]); 1922 if (((intptr_t)iocb == -1) || ((intptr_t)iocb 1923 == 0)) 1924 continue; 1925 1926 /* 1927 * Fetch the associated command from user space. 1928 */ 1929 command = fuword(&iocb->aio_lio_opcode); 1930 if (command == LIO_NOP) { 1931 found++; 1932 continue; 1933 } 1934 1935 jobref = fuword(&iocb->_aiocb_private.kernelinfo); 1936 1937 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1938 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 1939 == jobref) { 1940 if (cb->uaiocb.aio_lio_opcode 1941 == LIO_WRITE) { 1942 p->p_stats->p_ru.ru_oublock 1943 += 1944 cb->outputcharge; 1945 cb->outputcharge = 0; 1946 } else if (cb->uaiocb.aio_lio_opcode 1947 == LIO_READ) { 1948 p->p_stats->p_ru.ru_inblock 1949 += cb->inputcharge; 1950 cb->inputcharge = 0; 1951 } 1952 found++; 1953 break; 1954 } 1955 } 1956 1957 s = splbio(); 1958 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) { 1959 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 1960 == jobref) { 1961 found++; 1962 break; 1963 } 1964 } 1965 splx(s); 1966 } 1967 1968 /* 1969 * If all I/Os have been disposed of, then we can 1970 * return. 1971 */ 1972 if (found == nentqueued) 1973 return runningcode; 1974 1975 ki->kaio_flags |= KAIO_WAKEUP; 1976 error = tsleep(p, PCATCH, "aiospn", 0); 1977 1978 if (error == EINTR) 1979 return EINTR; 1980 else if (error == EWOULDBLOCK) 1981 return EAGAIN; 1982 } 1983 } 1984 1985 return runningcode; 1986 #endif /* VFS_AIO */ 1987 } 1988 1989 #ifdef VFS_AIO 1990 /* 1991 * This is a weird hack so that we can post a signal. It is safe to do so from 1992 * a timeout routine, but *not* from an interrupt routine. 1993 */ 1994 static void 1995 process_signal(void *aioj) 1996 { 1997 struct aiocblist *aiocbe = aioj; 1998 struct aio_liojob *lj = aiocbe->lio; 1999 struct aiocb *cb = &aiocbe->uaiocb; 2000 2001 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) && 2002 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) { 2003 psignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo); 2004 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2005 } 2006 2007 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) 2008 psignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo); 2009 } 2010 2011 /* 2012 * Interrupt handler for physio, performs the necessary process wakeups, and 2013 * signals. 2014 */ 2015 static void 2016 aio_physwakeup(struct buf *bp) 2017 { 2018 struct aiocblist *aiocbe; 2019 struct proc *p; 2020 struct kaioinfo *ki; 2021 struct aio_liojob *lj; 2022 2023 wakeup(bp); 2024 2025 aiocbe = (struct aiocblist *)bp->b_spc; 2026 if (aiocbe) { 2027 p = bp->b_caller1; 2028 2029 aiocbe->jobstate = JOBST_JOBBFINISHED; 2030 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; 2031 aiocbe->uaiocb._aiocb_private.error = 0; 2032 aiocbe->jobflags |= AIOCBLIST_DONE; 2033 2034 if (bp->b_flags & B_ERROR) 2035 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 2036 2037 lj = aiocbe->lio; 2038 if (lj) { 2039 lj->lioj_buffer_finished_count++; 2040 2041 /* 2042 * wakeup/signal if all of the interrupt jobs are done. 2043 */ 2044 if (lj->lioj_buffer_finished_count == 2045 lj->lioj_buffer_count) { 2046 /* 2047 * Post a signal if it is called for. 2048 */ 2049 if ((lj->lioj_flags & 2050 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == 2051 LIOJ_SIGNAL) { 2052 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2053 callout_reset(&aiocbe->timeout, 0, 2054 process_signal, aiocbe); 2055 } 2056 } 2057 } 2058 2059 ki = p->p_aioinfo; 2060 if (ki) { 2061 ki->kaio_buffer_finished_count++; 2062 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 2063 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 2064 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 2065 2066 KNOTE(&aiocbe->klist, 0); 2067 /* Do the wakeup. */ 2068 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) { 2069 ki->kaio_flags &= ~KAIO_WAKEUP; 2070 wakeup(p); 2071 } 2072 } 2073 2074 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 2075 callout_reset(&aiocbe->timeout, 0, 2076 process_signal, aiocbe); 2077 } 2078 } 2079 } 2080 #endif /* VFS_AIO */ 2081 2082 /* syscall - wait for the next completion of an aio request */ 2083 int 2084 aio_waitcomplete(struct aio_waitcomplete_args *uap) 2085 { 2086 #ifndef VFS_AIO 2087 return ENOSYS; 2088 #else 2089 struct proc *p = curproc; 2090 struct timeval atv; 2091 struct timespec ts; 2092 struct kaioinfo *ki; 2093 struct aiocblist *cb = NULL; 2094 int error, s, timo; 2095 2096 suword(uap->aiocbp, (int)NULL); 2097 2098 timo = 0; 2099 if (uap->timeout) { 2100 /* Get timespec struct. */ 2101 error = copyin(uap->timeout, &ts, sizeof(ts)); 2102 if (error) 2103 return error; 2104 2105 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000)) 2106 return (EINVAL); 2107 2108 TIMESPEC_TO_TIMEVAL(&atv, &ts); 2109 if (itimerfix(&atv)) 2110 return (EINVAL); 2111 timo = tvtohz_high(&atv); 2112 } 2113 2114 ki = p->p_aioinfo; 2115 if (ki == NULL) 2116 return EAGAIN; 2117 2118 for (;;) { 2119 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) { 2120 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2121 uap->sysmsg_result = cb->uaiocb._aiocb_private.status; 2122 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 2123 p->p_stats->p_ru.ru_oublock += 2124 cb->outputcharge; 2125 cb->outputcharge = 0; 2126 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 2127 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 2128 cb->inputcharge = 0; 2129 } 2130 aio_free_entry(cb); 2131 return cb->uaiocb._aiocb_private.error; 2132 } 2133 2134 s = splbio(); 2135 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) { 2136 splx(s); 2137 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2138 uap->sysmsg_result = cb->uaiocb._aiocb_private.status; 2139 aio_free_entry(cb); 2140 return cb->uaiocb._aiocb_private.error; 2141 } 2142 2143 ki->kaio_flags |= KAIO_WAKEUP; 2144 error = tsleep(p, PCATCH, "aiowc", timo); 2145 splx(s); 2146 2147 if (error == ERESTART) 2148 return EINTR; 2149 else if (error < 0) 2150 return error; 2151 else if (error == EINTR) 2152 return EINTR; 2153 else if (error == EWOULDBLOCK) 2154 return EAGAIN; 2155 } 2156 #endif /* VFS_AIO */ 2157 } 2158 2159 #ifndef VFS_AIO 2160 static int 2161 filt_aioattach(struct knote *kn) 2162 { 2163 2164 return (ENXIO); 2165 } 2166 2167 struct filterops aio_filtops = 2168 { 0, filt_aioattach, NULL, NULL }; 2169 2170 #else 2171 /* kqueue attach function */ 2172 static int 2173 filt_aioattach(struct knote *kn) 2174 { 2175 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2176 2177 /* 2178 * The aiocbe pointer must be validated before using it, so 2179 * registration is restricted to the kernel; the user cannot 2180 * set EV_FLAG1. 2181 */ 2182 if ((kn->kn_flags & EV_FLAG1) == 0) 2183 return (EPERM); 2184 kn->kn_flags &= ~EV_FLAG1; 2185 2186 SLIST_INSERT_HEAD(&aiocbe->klist, kn, kn_selnext); 2187 2188 return (0); 2189 } 2190 2191 /* kqueue detach function */ 2192 static void 2193 filt_aiodetach(struct knote *kn) 2194 { 2195 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2196 2197 SLIST_REMOVE(&aiocbe->klist, kn, knote, kn_selnext); 2198 } 2199 2200 /* kqueue filter function */ 2201 /*ARGSUSED*/ 2202 static int 2203 filt_aio(struct knote *kn, long hint) 2204 { 2205 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2206 2207 kn->kn_data = aiocbe->uaiocb._aiocb_private.error; 2208 if (aiocbe->jobstate != JOBST_JOBFINISHED && 2209 aiocbe->jobstate != JOBST_JOBBFINISHED) 2210 return (0); 2211 kn->kn_flags |= EV_EOF; 2212 return (1); 2213 } 2214 2215 struct filterops aio_filtops = 2216 { 0, filt_aioattach, filt_aiodetach, filt_aio }; 2217 #endif /* VFS_AIO */ 2218