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 1.42 2007/07/20 17:21:52 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 51 #include <sys/file2.h> 52 #include <sys/buf2.h> 53 #include <sys/sysref2.h> 54 #include <sys/thread2.h> 55 #include <sys/mplock2.h> 56 57 #include <machine/limits.h> 58 #include "opt_vfs_aio.h" 59 60 #ifdef VFS_AIO 61 62 /* 63 * Counter for allocating reference ids to new jobs. Wrapped to 1 on 64 * overflow. 65 */ 66 static long jobrefid; 67 68 #define JOBST_NULL 0x0 69 #define JOBST_JOBQGLOBAL 0x2 70 #define JOBST_JOBRUNNING 0x3 71 #define JOBST_JOBFINISHED 0x4 72 #define JOBST_JOBQBUF 0x5 73 #define JOBST_JOBBFINISHED 0x6 74 75 #ifndef MAX_AIO_PER_PROC 76 #define MAX_AIO_PER_PROC 32 77 #endif 78 79 #ifndef MAX_AIO_QUEUE_PER_PROC 80 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */ 81 #endif 82 83 #ifndef MAX_AIO_PROCS 84 #define MAX_AIO_PROCS 32 85 #endif 86 87 #ifndef MAX_AIO_QUEUE 88 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */ 89 #endif 90 91 #ifndef TARGET_AIO_PROCS 92 #define TARGET_AIO_PROCS 4 93 #endif 94 95 #ifndef MAX_BUF_AIO 96 #define MAX_BUF_AIO 16 97 #endif 98 99 #ifndef AIOD_TIMEOUT_DEFAULT 100 #define AIOD_TIMEOUT_DEFAULT (10 * hz) 101 #endif 102 103 #ifndef AIOD_LIFETIME_DEFAULT 104 #define AIOD_LIFETIME_DEFAULT (30 * hz) 105 #endif 106 107 SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management"); 108 109 static int max_aio_procs = MAX_AIO_PROCS; 110 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, 111 CTLFLAG_RW, &max_aio_procs, 0, 112 "Maximum number of kernel threads to use for handling async IO"); 113 114 static int num_aio_procs = 0; 115 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, 116 CTLFLAG_RD, &num_aio_procs, 0, 117 "Number of presently active kernel threads for async IO"); 118 119 /* 120 * The code will adjust the actual number of AIO processes towards this 121 * number when it gets a chance. 122 */ 123 static int target_aio_procs = TARGET_AIO_PROCS; 124 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 125 0, "Preferred number of ready kernel threads for async IO"); 126 127 static int max_queue_count = MAX_AIO_QUEUE; 128 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, 129 "Maximum number of aio requests to queue, globally"); 130 131 static int num_queue_count = 0; 132 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, 133 "Number of queued aio requests"); 134 135 static int num_buf_aio = 0; 136 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, 137 "Number of aio requests presently handled by the buf subsystem"); 138 139 /* Number of async I/O thread in the process of being started */ 140 /* XXX This should be local to _aio_aqueue() */ 141 static int num_aio_resv_start = 0; 142 143 static int aiod_timeout; 144 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0, 145 "Timeout value for synchronous aio operations"); 146 147 static int aiod_lifetime; 148 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, 149 "Maximum lifetime for idle aiod"); 150 151 static int max_aio_per_proc = MAX_AIO_PER_PROC; 152 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 153 0, "Maximum active aio requests per process (stored in the process)"); 154 155 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 156 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, 157 &max_aio_queue_per_proc, 0, 158 "Maximum queued aio requests per process (stored in the process)"); 159 160 static int max_buf_aio = MAX_BUF_AIO; 161 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, 162 "Maximum buf aio requests per process (stored in the process)"); 163 164 /* 165 * AIO process info 166 */ 167 #define AIOP_FREE 0x1 /* proc on free queue */ 168 #define AIOP_SCHED 0x2 /* proc explicitly scheduled */ 169 170 struct aioproclist { 171 int aioprocflags; /* AIO proc flags */ 172 TAILQ_ENTRY(aioproclist) list; /* List of processes */ 173 struct proc *aioproc; /* The AIO thread */ 174 }; 175 176 /* 177 * data-structure for lio signal management 178 */ 179 struct aio_liojob { 180 int lioj_flags; 181 int lioj_buffer_count; 182 int lioj_buffer_finished_count; 183 int lioj_queue_count; 184 int lioj_queue_finished_count; 185 struct sigevent lioj_signal; /* signal on all I/O done */ 186 TAILQ_ENTRY(aio_liojob) lioj_list; 187 struct kaioinfo *lioj_ki; 188 }; 189 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ 190 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ 191 192 /* 193 * per process aio data structure 194 */ 195 struct kaioinfo { 196 int kaio_flags; /* per process kaio flags */ 197 int kaio_maxactive_count; /* maximum number of AIOs */ 198 int kaio_active_count; /* number of currently used AIOs */ 199 int kaio_qallowed_count; /* maxiumu size of AIO queue */ 200 int kaio_queue_count; /* size of AIO queue */ 201 int kaio_ballowed_count; /* maximum number of buffers */ 202 int kaio_queue_finished_count; /* number of daemon jobs finished */ 203 int kaio_buffer_count; /* number of physio buffers */ 204 int kaio_buffer_finished_count; /* count of I/O done */ 205 struct proc *kaio_p; /* process that uses this kaio block */ 206 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */ 207 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */ 208 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */ 209 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */ 210 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */ 211 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */ 212 }; 213 214 #define KAIO_RUNDOWN 0x1 /* process is being run down */ 215 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ 216 217 static TAILQ_HEAD(,aioproclist) aio_freeproc, aio_activeproc; 218 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */ 219 static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */ 220 static TAILQ_HEAD(,aiocblist) aio_freejobs; /* Pool of free jobs */ 221 222 static void aio_init_aioinfo(struct proc *p); 223 static void aio_onceonly(void *); 224 static int aio_free_entry(struct aiocblist *aiocbe); 225 static void aio_process(struct aiocblist *aiocbe); 226 static int aio_newproc(void); 227 static int aio_aqueue(struct aiocb *job, int type); 228 static void aio_physwakeup(struct bio *bio); 229 static int aio_fphysio(struct aiocblist *aiocbe); 230 static int aio_qphysio(struct proc *p, struct aiocblist *iocb); 231 static void aio_daemon(void *uproc, struct trapframe *frame); 232 static void process_signal(void *aioj); 233 234 SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL); 235 236 /* 237 * Zones for: 238 * kaio Per process async io info 239 * aiop async io thread data 240 * aiocb async io jobs 241 * aiol list io job pointer - internal to aio_suspend XXX 242 * aiolio list io jobs 243 */ 244 static vm_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone; 245 246 /* 247 * Startup initialization 248 */ 249 static void 250 aio_onceonly(void *na) 251 { 252 TAILQ_INIT(&aio_freeproc); 253 TAILQ_INIT(&aio_activeproc); 254 TAILQ_INIT(&aio_jobs); 255 TAILQ_INIT(&aio_bufjobs); 256 TAILQ_INIT(&aio_freejobs); 257 kaio_zone = zinit("AIO", sizeof(struct kaioinfo), 0, 0, 1); 258 aiop_zone = zinit("AIOP", sizeof(struct aioproclist), 0, 0, 1); 259 aiocb_zone = zinit("AIOCB", sizeof(struct aiocblist), 0, 0, 1); 260 aiol_zone = zinit("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t), 0, 0, 1); 261 aiolio_zone = zinit("AIOLIO", sizeof(struct aio_liojob), 0, 0, 1); 262 aiod_timeout = AIOD_TIMEOUT_DEFAULT; 263 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 264 jobrefid = 1; 265 } 266 267 /* 268 * Init the per-process aioinfo structure. The aioinfo limits are set 269 * per-process for user limit (resource) management. 270 */ 271 static void 272 aio_init_aioinfo(struct proc *p) 273 { 274 struct kaioinfo *ki; 275 if (p->p_aioinfo == NULL) { 276 ki = zalloc(kaio_zone); 277 p->p_aioinfo = ki; 278 ki->kaio_flags = 0; 279 ki->kaio_maxactive_count = max_aio_per_proc; 280 ki->kaio_active_count = 0; 281 ki->kaio_qallowed_count = max_aio_queue_per_proc; 282 ki->kaio_queue_count = 0; 283 ki->kaio_ballowed_count = max_buf_aio; 284 ki->kaio_buffer_count = 0; 285 ki->kaio_buffer_finished_count = 0; 286 ki->kaio_p = p; 287 TAILQ_INIT(&ki->kaio_jobdone); 288 TAILQ_INIT(&ki->kaio_jobqueue); 289 TAILQ_INIT(&ki->kaio_bufdone); 290 TAILQ_INIT(&ki->kaio_bufqueue); 291 TAILQ_INIT(&ki->kaio_liojoblist); 292 TAILQ_INIT(&ki->kaio_sockqueue); 293 } 294 295 while (num_aio_procs < target_aio_procs) 296 aio_newproc(); 297 } 298 299 /* 300 * Free a job entry. Wait for completion if it is currently active, but don't 301 * delay forever. If we delay, we return a flag that says that we have to 302 * restart the queue scan. 303 */ 304 static int 305 aio_free_entry(struct aiocblist *aiocbe) 306 { 307 struct kaioinfo *ki; 308 struct aio_liojob *lj; 309 struct proc *p; 310 int error; 311 312 if (aiocbe->jobstate == JOBST_NULL) 313 panic("aio_free_entry: freeing already free job"); 314 315 p = aiocbe->userproc; 316 ki = p->p_aioinfo; 317 lj = aiocbe->lio; 318 if (ki == NULL) 319 panic("aio_free_entry: missing p->p_aioinfo"); 320 321 while (aiocbe->jobstate == JOBST_JOBRUNNING) { 322 aiocbe->jobflags |= AIOCBLIST_RUNDOWN; 323 tsleep(aiocbe, 0, "jobwai", 0); 324 } 325 if (aiocbe->bp == NULL) { 326 if (ki->kaio_queue_count <= 0) 327 panic("aio_free_entry: process queue size <= 0"); 328 if (num_queue_count <= 0) 329 panic("aio_free_entry: system wide queue size <= 0"); 330 331 if (lj) { 332 lj->lioj_queue_count--; 333 if (aiocbe->jobflags & AIOCBLIST_DONE) 334 lj->lioj_queue_finished_count--; 335 } 336 ki->kaio_queue_count--; 337 if (aiocbe->jobflags & AIOCBLIST_DONE) 338 ki->kaio_queue_finished_count--; 339 num_queue_count--; 340 } else { 341 if (lj) { 342 lj->lioj_buffer_count--; 343 if (aiocbe->jobflags & AIOCBLIST_DONE) 344 lj->lioj_buffer_finished_count--; 345 } 346 if (aiocbe->jobflags & AIOCBLIST_DONE) 347 ki->kaio_buffer_finished_count--; 348 ki->kaio_buffer_count--; 349 num_buf_aio--; 350 } 351 352 /* aiocbe is going away, we need to destroy any knotes */ 353 /* XXX lwp knote wants a thread, but only cares about the process */ 354 knote_empty(&aiocbe->klist); 355 356 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN) 357 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) { 358 ki->kaio_flags &= ~KAIO_WAKEUP; 359 wakeup(p); 360 } 361 362 if (aiocbe->jobstate == JOBST_JOBQBUF) { 363 if ((error = aio_fphysio(aiocbe)) != 0) 364 return error; 365 if (aiocbe->jobstate != JOBST_JOBBFINISHED) 366 panic("aio_free_entry: invalid physio finish-up state"); 367 crit_enter(); 368 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 369 crit_exit(); 370 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) { 371 crit_enter(); 372 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 373 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 374 crit_exit(); 375 } else if (aiocbe->jobstate == JOBST_JOBFINISHED) 376 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist); 377 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) { 378 crit_enter(); 379 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 380 crit_exit(); 381 if (aiocbe->bp) { 382 vunmapbuf(aiocbe->bp); 383 relpbuf(aiocbe->bp, NULL); 384 aiocbe->bp = NULL; 385 } 386 } 387 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) { 388 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 389 zfree(aiolio_zone, lj); 390 } 391 aiocbe->jobstate = JOBST_NULL; 392 callout_stop(&aiocbe->timeout); 393 fdrop(aiocbe->fd_file); 394 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 395 return 0; 396 } 397 #endif /* VFS_AIO */ 398 399 /* 400 * Rundown the jobs for a given process. 401 */ 402 void 403 aio_proc_rundown(struct proc *p) 404 { 405 #ifndef VFS_AIO 406 return; 407 #else 408 struct kaioinfo *ki; 409 struct aio_liojob *lj, *ljn; 410 struct aiocblist *aiocbe, *aiocbn; 411 struct file *fp; 412 struct socket *so; 413 414 ki = p->p_aioinfo; 415 if (ki == NULL) 416 return; 417 418 ki->kaio_flags |= LIOJ_SIGNAL_POSTED; 419 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count > 420 ki->kaio_buffer_finished_count)) { 421 ki->kaio_flags |= KAIO_RUNDOWN; 422 if (tsleep(p, 0, "kaiowt", aiod_timeout)) 423 break; 424 } 425 426 /* 427 * Move any aio ops that are waiting on socket I/O to the normal job 428 * queues so they are cleaned up with any others. 429 */ 430 crit_enter(); 431 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe = 432 aiocbn) { 433 aiocbn = TAILQ_NEXT(aiocbe, plist); 434 fp = aiocbe->fd_file; 435 if (fp != NULL) { 436 so = (struct socket *)fp->f_data; 437 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list); 438 if (TAILQ_EMPTY(&so->so_aiojobq)) { 439 so->so_snd.ssb_flags &= ~SSB_AIO; 440 so->so_rcv.ssb_flags &= ~SSB_AIO; 441 } 442 } 443 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist); 444 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list); 445 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist); 446 } 447 crit_exit(); 448 449 restart1: 450 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) { 451 aiocbn = TAILQ_NEXT(aiocbe, plist); 452 if (aio_free_entry(aiocbe)) 453 goto restart1; 454 } 455 456 restart2: 457 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe = 458 aiocbn) { 459 aiocbn = TAILQ_NEXT(aiocbe, plist); 460 if (aio_free_entry(aiocbe)) 461 goto restart2; 462 } 463 464 restart3: 465 crit_enter(); 466 while (TAILQ_FIRST(&ki->kaio_bufqueue)) { 467 ki->kaio_flags |= KAIO_WAKEUP; 468 tsleep(p, 0, "aioprn", 0); 469 crit_exit(); 470 goto restart3; 471 } 472 crit_exit(); 473 474 restart4: 475 crit_enter(); 476 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) { 477 aiocbn = TAILQ_NEXT(aiocbe, plist); 478 if (aio_free_entry(aiocbe)) { 479 crit_exit(); 480 goto restart4; 481 } 482 } 483 crit_exit(); 484 485 /* 486 * If we've slept, jobs might have moved from one queue to another. 487 * Retry rundown if we didn't manage to empty the queues. 488 */ 489 if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL || 490 TAILQ_FIRST(&ki->kaio_jobqueue) != NULL || 491 TAILQ_FIRST(&ki->kaio_bufqueue) != NULL || 492 TAILQ_FIRST(&ki->kaio_bufdone) != NULL) 493 goto restart1; 494 495 for (lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) { 496 ljn = TAILQ_NEXT(lj, lioj_list); 497 if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 498 0)) { 499 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 500 zfree(aiolio_zone, lj); 501 } else { 502 #ifdef DIAGNOSTIC 503 kprintf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, " 504 "QF:%d\n", lj->lioj_buffer_count, 505 lj->lioj_buffer_finished_count, 506 lj->lioj_queue_count, 507 lj->lioj_queue_finished_count); 508 #endif 509 } 510 } 511 512 zfree(kaio_zone, ki); 513 p->p_aioinfo = NULL; 514 #endif /* VFS_AIO */ 515 } 516 517 #ifdef VFS_AIO 518 /* 519 * Select a job to run (called by an AIO daemon). 520 */ 521 static struct aiocblist * 522 aio_selectjob(struct aioproclist *aiop) 523 { 524 struct aiocblist *aiocbe; 525 struct kaioinfo *ki; 526 struct proc *userp; 527 528 crit_enter(); 529 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe = 530 TAILQ_NEXT(aiocbe, list)) { 531 userp = aiocbe->userproc; 532 ki = userp->p_aioinfo; 533 534 if (ki->kaio_active_count < ki->kaio_maxactive_count) { 535 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 536 crit_exit(); 537 return aiocbe; 538 } 539 } 540 crit_exit(); 541 542 return NULL; 543 } 544 545 /* 546 * The AIO processing activity. This is the code that does the I/O request for 547 * the non-physio version of the operations. The normal vn operations are used, 548 * and this code should work in all instances for every type of file, including 549 * pipes, sockets, fifos, and regular files. 550 */ 551 static void 552 aio_process(struct aiocblist *aiocbe) 553 { 554 struct thread *mytd; 555 struct aiocb *cb; 556 struct file *fp; 557 struct uio auio; 558 struct iovec aiov; 559 int cnt; 560 int error; 561 int oublock_st, oublock_end; 562 int inblock_st, inblock_end; 563 564 mytd = curthread; 565 cb = &aiocbe->uaiocb; 566 fp = aiocbe->fd_file; 567 568 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; 569 aiov.iov_len = cb->aio_nbytes; 570 571 auio.uio_iov = &aiov; 572 auio.uio_iovcnt = 1; 573 auio.uio_offset = cb->aio_offset; 574 auio.uio_resid = cb->aio_nbytes; 575 cnt = cb->aio_nbytes; 576 auio.uio_segflg = UIO_USERSPACE; 577 auio.uio_td = mytd; 578 579 inblock_st = mytd->td_lwp->lwp_ru.ru_inblock; 580 oublock_st = mytd->td_lwp->lwp_ru.ru_oublock; 581 /* 582 * _aio_aqueue() acquires a reference to the file that is 583 * released in aio_free_entry(). 584 */ 585 if (cb->aio_lio_opcode == LIO_READ) { 586 auio.uio_rw = UIO_READ; 587 error = fo_read(fp, &auio, fp->f_cred, O_FOFFSET); 588 } else { 589 auio.uio_rw = UIO_WRITE; 590 error = fo_write(fp, &auio, fp->f_cred, O_FOFFSET); 591 } 592 inblock_end = mytd->td_lwp->lwp_ru.ru_inblock; 593 oublock_end = mytd->td_lwp->lwp_ru.ru_oublock; 594 595 aiocbe->inputcharge = inblock_end - inblock_st; 596 aiocbe->outputcharge = oublock_end - oublock_st; 597 598 if ((error) && (auio.uio_resid != cnt)) { 599 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 600 error = 0; 601 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) 602 ksignal(aiocbe->userproc, SIGPIPE); 603 } 604 605 cnt -= auio.uio_resid; 606 cb->_aiocb_private.error = error; 607 cb->_aiocb_private.status = cnt; 608 } 609 610 /* 611 * The AIO daemon, most of the actual work is done in aio_process, 612 * but the setup (and address space mgmt) is done in this routine. 613 */ 614 static void 615 aio_daemon(void *uproc, struct trapframe *frame) 616 { 617 struct aio_liojob *lj; 618 struct aiocb *cb; 619 struct aiocblist *aiocbe; 620 struct aioproclist *aiop; 621 struct kaioinfo *ki; 622 struct proc *mycp, *userp; 623 struct vmspace *curvm; 624 struct lwp *mylwp; 625 struct ucred *cr; 626 627 /* 628 * mplock not held on entry but we aren't mpsafe yet. 629 */ 630 get_mplock(); 631 632 mylwp = curthread->td_lwp; 633 mycp = mylwp->lwp_proc; 634 635 if (mycp->p_textvp) { 636 vrele(mycp->p_textvp); 637 mycp->p_textvp = NULL; 638 } 639 640 /* 641 * Allocate and ready the aio control info. There is one aiop structure 642 * per daemon. 643 */ 644 aiop = zalloc(aiop_zone); 645 aiop->aioproc = mycp; 646 aiop->aioprocflags |= AIOP_FREE; 647 648 crit_enter(); 649 650 /* 651 * Place thread (lightweight process) onto the AIO free thread list. 652 */ 653 if (TAILQ_EMPTY(&aio_freeproc)) 654 wakeup(&aio_freeproc); 655 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 656 657 crit_exit(); 658 659 /* Make up a name for the daemon. */ 660 strcpy(mycp->p_comm, "aiod"); 661 662 /* 663 * Get rid of our current filedescriptors. AIOD's don't need any 664 * filedescriptors, except as temporarily inherited from the client. 665 * Credentials are also cloned, and made equivalent to "root". 666 */ 667 fdfree(mycp, NULL); 668 cr = cratom(&mycp->p_ucred); 669 cr->cr_uid = 0; 670 uireplace(&cr->cr_uidinfo, uifind(0)); 671 cr->cr_ngroups = 1; 672 cr->cr_groups[0] = 1; 673 674 /* The daemon resides in its own pgrp. */ 675 enterpgrp(mycp, mycp->p_pid, 1); 676 677 /* Mark special process type. */ 678 mycp->p_flag |= P_SYSTEM | P_KTHREADP; 679 680 /* 681 * Wakeup parent process. (Parent sleeps to keep from blasting away 682 * and creating too many daemons.) 683 */ 684 wakeup(mycp); 685 curvm = NULL; 686 687 for (;;) { 688 /* 689 * Take daemon off of free queue 690 */ 691 if (aiop->aioprocflags & AIOP_FREE) { 692 crit_enter(); 693 TAILQ_REMOVE(&aio_freeproc, aiop, list); 694 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 695 aiop->aioprocflags &= ~AIOP_FREE; 696 crit_exit(); 697 } 698 aiop->aioprocflags &= ~AIOP_SCHED; 699 700 /* 701 * Check for jobs. 702 */ 703 while ((aiocbe = aio_selectjob(aiop)) != NULL) { 704 cb = &aiocbe->uaiocb; 705 userp = aiocbe->userproc; 706 707 aiocbe->jobstate = JOBST_JOBRUNNING; 708 709 /* 710 * Connect to process address space for user program. 711 */ 712 if (curvm != userp->p_vmspace) { 713 pmap_setlwpvm(mylwp, userp->p_vmspace); 714 if (curvm) 715 sysref_put(&curvm->vm_sysref); 716 curvm = userp->p_vmspace; 717 sysref_get(&curvm->vm_sysref); 718 } 719 720 ki = userp->p_aioinfo; 721 lj = aiocbe->lio; 722 723 /* Account for currently active jobs. */ 724 ki->kaio_active_count++; 725 726 /* Do the I/O function. */ 727 aio_process(aiocbe); 728 729 /* Decrement the active job count. */ 730 ki->kaio_active_count--; 731 732 /* 733 * Increment the completion count for wakeup/signal 734 * comparisons. 735 */ 736 aiocbe->jobflags |= AIOCBLIST_DONE; 737 ki->kaio_queue_finished_count++; 738 if (lj) 739 lj->lioj_queue_finished_count++; 740 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags 741 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) { 742 ki->kaio_flags &= ~KAIO_WAKEUP; 743 wakeup(userp); 744 } 745 746 crit_enter(); 747 if (lj && (lj->lioj_flags & 748 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) { 749 if ((lj->lioj_queue_finished_count == 750 lj->lioj_queue_count) && 751 (lj->lioj_buffer_finished_count == 752 lj->lioj_buffer_count)) { 753 ksignal(userp, 754 lj->lioj_signal.sigev_signo); 755 lj->lioj_flags |= 756 LIOJ_SIGNAL_POSTED; 757 } 758 } 759 crit_exit(); 760 761 aiocbe->jobstate = JOBST_JOBFINISHED; 762 763 crit_enter(); 764 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 765 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist); 766 crit_exit(); 767 KNOTE(&aiocbe->klist, 0); 768 769 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) { 770 wakeup(aiocbe); 771 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN; 772 } 773 774 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 775 ksignal(userp, cb->aio_sigevent.sigev_signo); 776 } 777 } 778 779 /* 780 * Disconnect from user address space. 781 */ 782 if (curvm) { 783 /* swap our original address space back in */ 784 pmap_setlwpvm(mylwp, mycp->p_vmspace); 785 sysref_put(&curvm->vm_sysref); 786 curvm = NULL; 787 } 788 789 /* 790 * If we are the first to be put onto the free queue, wakeup 791 * anyone waiting for a daemon. 792 */ 793 crit_enter(); 794 TAILQ_REMOVE(&aio_activeproc, aiop, list); 795 if (TAILQ_EMPTY(&aio_freeproc)) 796 wakeup(&aio_freeproc); 797 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 798 aiop->aioprocflags |= AIOP_FREE; 799 crit_exit(); 800 801 /* 802 * If daemon is inactive for a long time, allow it to exit, 803 * thereby freeing resources. 804 */ 805 if (((aiop->aioprocflags & AIOP_SCHED) == 0) && tsleep(mycp, 806 0, "aiordy", aiod_lifetime)) { 807 crit_enter(); 808 if (TAILQ_EMPTY(&aio_jobs)) { 809 if ((aiop->aioprocflags & AIOP_FREE) && 810 (num_aio_procs > target_aio_procs)) { 811 TAILQ_REMOVE(&aio_freeproc, aiop, list); 812 crit_exit(); 813 zfree(aiop_zone, aiop); 814 num_aio_procs--; 815 #ifdef DIAGNOSTIC 816 if (mycp->p_vmspace->vm_sysref.refcnt <= 1) { 817 kprintf("AIOD: bad vm refcnt for" 818 " exiting daemon: %d\n", 819 mycp->p_vmspace->vm_sysref.refcnt); 820 } 821 #endif 822 exit1(0); 823 } 824 } 825 crit_exit(); 826 } 827 } 828 } 829 830 /* 831 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 832 * AIO daemon modifies its environment itself. 833 */ 834 static int 835 aio_newproc(void) 836 { 837 int error; 838 struct lwp *lp, *nlp; 839 struct proc *np; 840 841 lp = &lwp0; 842 error = fork1(lp, RFPROC|RFMEM|RFNOWAIT, &np); 843 if (error) 844 return error; 845 nlp = ONLY_LWP_IN_PROC(np); 846 cpu_set_fork_handler(nlp, aio_daemon, curproc); 847 start_forked_proc(lp, np); 848 849 /* 850 * Wait until daemon is started, but continue on just in case to 851 * handle error conditions. 852 */ 853 error = tsleep(np, 0, "aiosta", aiod_timeout); 854 num_aio_procs++; 855 856 return error; 857 } 858 859 /* 860 * Try the high-performance, low-overhead physio method for eligible 861 * VCHR devices. This method doesn't use an aio helper thread, and 862 * thus has very low overhead. 863 * 864 * Assumes that the caller, _aio_aqueue(), has incremented the file 865 * structure's reference count, preventing its deallocation for the 866 * duration of this call. 867 */ 868 static int 869 aio_qphysio(struct proc *p, struct aiocblist *aiocbe) 870 { 871 int error; 872 struct aiocb *cb; 873 struct file *fp; 874 struct buf *bp; 875 struct vnode *vp; 876 struct kaioinfo *ki; 877 struct aio_liojob *lj; 878 int notify; 879 880 cb = &aiocbe->uaiocb; 881 fp = aiocbe->fd_file; 882 883 if (fp->f_type != DTYPE_VNODE) 884 return (-1); 885 886 vp = (struct vnode *)fp->f_data; 887 888 /* 889 * If its not a disk, we don't want to return a positive error. 890 * It causes the aio code to not fall through to try the thread 891 * way when you're talking to a regular file. 892 */ 893 if (!vn_isdisk(vp, &error)) { 894 if (error == ENOTBLK) 895 return (-1); 896 else 897 return (error); 898 } 899 900 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys) 901 return (-1); 902 903 if (cb->aio_nbytes > 904 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK)) 905 return (-1); 906 907 ki = p->p_aioinfo; 908 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) 909 return (-1); 910 911 ki->kaio_buffer_count++; 912 913 lj = aiocbe->lio; 914 if (lj) 915 lj->lioj_buffer_count++; 916 917 /* Create and build a buffer header for a transfer. */ 918 bp = getpbuf_kva(NULL); 919 BUF_KERNPROC(bp); 920 921 /* 922 * Get a copy of the kva from the physical buffer. 923 */ 924 bp->b_bio1.bio_caller_info1.ptr = p; 925 error = 0; 926 927 bp->b_cmd = (cb->aio_lio_opcode == LIO_WRITE) ? 928 BUF_CMD_WRITE : BUF_CMD_READ; 929 bp->b_bio1.bio_done = aio_physwakeup; 930 bp->b_bio1.bio_flags |= BIO_SYNC; 931 bp->b_bio1.bio_offset = cb->aio_offset; 932 933 /* Bring buffer into kernel space. */ 934 if (vmapbuf(bp, __DEVOLATILE(char *, cb->aio_buf), cb->aio_nbytes) < 0) { 935 error = EFAULT; 936 goto doerror; 937 } 938 939 crit_enter(); 940 941 aiocbe->bp = bp; 942 bp->b_bio1.bio_caller_info2.ptr = aiocbe; 943 TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list); 944 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); 945 aiocbe->jobstate = JOBST_JOBQBUF; 946 cb->_aiocb_private.status = cb->aio_nbytes; 947 num_buf_aio++; 948 bp->b_error = 0; 949 950 crit_exit(); 951 952 /* 953 * Perform the transfer. vn_strategy must be used even though we 954 * know we have a device in order to deal with requests which exceed 955 * device DMA limitations. 956 */ 957 vn_strategy(vp, &bp->b_bio1); 958 959 notify = 0; 960 crit_enter(); 961 962 #if 0 963 /* 964 * If we had an error invoking the request, or an error in processing 965 * the request before we have returned, we process it as an error in 966 * transfer. Note that such an I/O error is not indicated immediately, 967 * but is returned using the aio_error mechanism. In this case, 968 * aio_suspend will return immediately. 969 */ 970 if (bp->b_error || (bp->b_flags & B_ERROR)) { 971 struct aiocb *job = aiocbe->uuaiocb; 972 973 aiocbe->uaiocb._aiocb_private.status = 0; 974 suword(&job->_aiocb_private.status, 0); 975 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 976 suword(&job->_aiocb_private.error, bp->b_error); 977 978 ki->kaio_buffer_finished_count++; 979 980 if (aiocbe->jobstate != JOBST_JOBBFINISHED) { 981 aiocbe->jobstate = JOBST_JOBBFINISHED; 982 aiocbe->jobflags |= AIOCBLIST_DONE; 983 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 984 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 985 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 986 notify = 1; 987 } 988 } 989 #endif 990 crit_exit(); 991 if (notify) 992 KNOTE(&aiocbe->klist, 0); 993 return 0; 994 995 doerror: 996 ki->kaio_buffer_count--; 997 if (lj) 998 lj->lioj_buffer_count--; 999 aiocbe->bp = NULL; 1000 relpbuf(bp, NULL); 1001 return error; 1002 } 1003 1004 /* 1005 * This waits/tests physio completion. 1006 */ 1007 static int 1008 aio_fphysio(struct aiocblist *iocb) 1009 { 1010 struct buf *bp; 1011 int error; 1012 1013 bp = iocb->bp; 1014 1015 error = biowait_timeout(&bp->b_bio1, "physstr", aiod_timeout); 1016 if (error == EWOULDBLOCK) 1017 return EINPROGRESS; 1018 1019 /* Release mapping into kernel space. */ 1020 vunmapbuf(bp); 1021 iocb->bp = 0; 1022 1023 error = 0; 1024 1025 /* Check for an error. */ 1026 if (bp->b_flags & B_ERROR) 1027 error = bp->b_error; 1028 1029 relpbuf(bp, NULL); 1030 return (error); 1031 } 1032 #endif /* VFS_AIO */ 1033 1034 /* 1035 * Wake up aio requests that may be serviceable now. 1036 */ 1037 void 1038 aio_swake(struct socket *so, struct signalsockbuf *ssb) 1039 { 1040 #ifndef VFS_AIO 1041 return; 1042 #else 1043 struct aiocblist *cb,*cbn; 1044 struct proc *p; 1045 struct kaioinfo *ki = NULL; 1046 int opcode, wakecount = 0; 1047 struct aioproclist *aiop; 1048 1049 if (ssb == &so->so_snd) { 1050 opcode = LIO_WRITE; 1051 so->so_snd.ssb_flags &= ~SSB_AIO; 1052 } else { 1053 opcode = LIO_READ; 1054 so->so_rcv.ssb_flags &= ~SSB_AIO; 1055 } 1056 1057 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) { 1058 cbn = TAILQ_NEXT(cb, list); 1059 if (opcode == cb->uaiocb.aio_lio_opcode) { 1060 p = cb->userproc; 1061 ki = p->p_aioinfo; 1062 TAILQ_REMOVE(&so->so_aiojobq, cb, list); 1063 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist); 1064 TAILQ_INSERT_TAIL(&aio_jobs, cb, list); 1065 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist); 1066 wakecount++; 1067 if (cb->jobstate != JOBST_JOBQGLOBAL) 1068 panic("invalid queue value"); 1069 } 1070 } 1071 1072 while (wakecount--) { 1073 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) { 1074 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1075 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1076 aiop->aioprocflags &= ~AIOP_FREE; 1077 wakeup(aiop->aioproc); 1078 } 1079 } 1080 #endif /* VFS_AIO */ 1081 } 1082 1083 #ifdef VFS_AIO 1084 /* 1085 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR 1086 * technique is done in this code. 1087 */ 1088 static int 1089 _aio_aqueue(struct aiocb *job, struct aio_liojob *lj, int type) 1090 { 1091 struct proc *p = curproc; 1092 struct file *fp; 1093 unsigned int fd; 1094 struct socket *so; 1095 int error; 1096 int opcode, user_opcode; 1097 struct aiocblist *aiocbe; 1098 struct aioproclist *aiop; 1099 struct kaioinfo *ki; 1100 struct kevent kev; 1101 struct kqueue *kq; 1102 struct file *kq_fp; 1103 int fflags; 1104 1105 if ((aiocbe = TAILQ_FIRST(&aio_freejobs)) != NULL) 1106 TAILQ_REMOVE(&aio_freejobs, aiocbe, list); 1107 else 1108 aiocbe = zalloc (aiocb_zone); 1109 1110 aiocbe->inputcharge = 0; 1111 aiocbe->outputcharge = 0; 1112 callout_init(&aiocbe->timeout); 1113 SLIST_INIT(&aiocbe->klist); 1114 1115 suword(&job->_aiocb_private.status, -1); 1116 suword(&job->_aiocb_private.error, 0); 1117 suword(&job->_aiocb_private.kernelinfo, -1); 1118 1119 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb)); 1120 if (error) { 1121 suword(&job->_aiocb_private.error, error); 1122 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1123 return error; 1124 } 1125 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL && 1126 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) { 1127 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1128 return EINVAL; 1129 } 1130 1131 /* Save userspace address of the job info. */ 1132 aiocbe->uuaiocb = job; 1133 1134 /* Get the opcode. */ 1135 user_opcode = aiocbe->uaiocb.aio_lio_opcode; 1136 if (type != LIO_NOP) 1137 aiocbe->uaiocb.aio_lio_opcode = type; 1138 opcode = aiocbe->uaiocb.aio_lio_opcode; 1139 1140 /* 1141 * Range check file descriptor. 1142 */ 1143 fflags = (opcode == LIO_WRITE) ? FWRITE : FREAD; 1144 fd = aiocbe->uaiocb.aio_fildes; 1145 fp = holdfp(p->p_fd, fd, fflags); 1146 if (fp == NULL) { 1147 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1148 if (type == 0) 1149 suword(&job->_aiocb_private.error, EBADF); 1150 return EBADF; 1151 } 1152 1153 aiocbe->fd_file = fp; 1154 1155 if (aiocbe->uaiocb.aio_offset == -1LL) { 1156 error = EINVAL; 1157 goto aqueue_fail; 1158 } 1159 error = suword(&job->_aiocb_private.kernelinfo, jobrefid); 1160 if (error) { 1161 error = EINVAL; 1162 goto aqueue_fail; 1163 } 1164 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid; 1165 if (jobrefid == LONG_MAX) 1166 jobrefid = 1; 1167 else 1168 jobrefid++; 1169 1170 if (opcode == LIO_NOP) { 1171 fdrop(fp); 1172 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1173 if (type == 0) { 1174 suword(&job->_aiocb_private.error, 0); 1175 suword(&job->_aiocb_private.status, 0); 1176 suword(&job->_aiocb_private.kernelinfo, 0); 1177 } 1178 return 0; 1179 } 1180 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) { 1181 if (type == 0) 1182 suword(&job->_aiocb_private.status, 0); 1183 error = EINVAL; 1184 goto aqueue_fail; 1185 } 1186 1187 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) { 1188 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue; 1189 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sival_ptr; 1190 } 1191 else { 1192 /* 1193 * This method for requesting kevent-based notification won't 1194 * work on the alpha, since we're passing in a pointer 1195 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT- 1196 * based method instead. 1197 */ 1198 if (user_opcode == LIO_NOP || user_opcode == LIO_READ || 1199 user_opcode == LIO_WRITE) 1200 goto no_kqueue; 1201 1202 error = copyin((struct kevent *)(uintptr_t)user_opcode, 1203 &kev, sizeof(kev)); 1204 if (error) 1205 goto aqueue_fail; 1206 } 1207 kq_fp = holdfp(p->p_fd, (int)kev.ident, -1); 1208 if (kq_fp == NULL || kq_fp->f_type != DTYPE_KQUEUE) { 1209 if (kq_fp) { 1210 fdrop(kq_fp); 1211 kq_fp = NULL; 1212 } 1213 error = EBADF; 1214 goto aqueue_fail; 1215 } 1216 kq = (struct kqueue *)kq_fp->f_data; 1217 kev.ident = (uintptr_t)aiocbe->uuaiocb; 1218 kev.filter = EVFILT_AIO; 1219 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 1220 kev.data = (intptr_t)aiocbe; 1221 error = kqueue_register(kq, &kev); 1222 fdrop(kq_fp); 1223 aqueue_fail: 1224 if (error) { 1225 fdrop(fp); 1226 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1227 if (type == 0) 1228 suword(&job->_aiocb_private.error, error); 1229 goto done; 1230 } 1231 no_kqueue: 1232 1233 suword(&job->_aiocb_private.error, EINPROGRESS); 1234 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; 1235 aiocbe->userproc = p; 1236 aiocbe->jobflags = 0; 1237 aiocbe->lio = lj; 1238 ki = p->p_aioinfo; 1239 1240 if (fp->f_type == DTYPE_SOCKET) { 1241 /* 1242 * Alternate queueing for socket ops: Reach down into the 1243 * descriptor to get the socket data. Then check to see if the 1244 * socket is ready to be read or written (based on the requested 1245 * operation). 1246 * 1247 * If it is not ready for io, then queue the aiocbe on the 1248 * socket, and set the flags so we get a call when ssb_notify() 1249 * happens. 1250 */ 1251 so = (struct socket *)fp->f_data; 1252 crit_enter(); 1253 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode == 1254 LIO_WRITE) && (!sowriteable(so)))) { 1255 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list); 1256 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist); 1257 if (opcode == LIO_READ) 1258 so->so_rcv.ssb_flags |= SSB_AIO; 1259 else 1260 so->so_snd.ssb_flags |= SSB_AIO; 1261 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */ 1262 ki->kaio_queue_count++; 1263 num_queue_count++; 1264 crit_exit(); 1265 error = 0; 1266 goto done; 1267 } 1268 crit_exit(); 1269 } 1270 1271 if ((error = aio_qphysio(p, aiocbe)) == 0) 1272 goto done; 1273 if (error > 0) { 1274 suword(&job->_aiocb_private.status, 0); 1275 aiocbe->uaiocb._aiocb_private.error = error; 1276 suword(&job->_aiocb_private.error, error); 1277 goto done; 1278 } 1279 1280 /* No buffer for daemon I/O. */ 1281 aiocbe->bp = NULL; 1282 1283 ki->kaio_queue_count++; 1284 if (lj) 1285 lj->lioj_queue_count++; 1286 crit_enter(); 1287 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); 1288 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); 1289 crit_exit(); 1290 aiocbe->jobstate = JOBST_JOBQGLOBAL; 1291 1292 num_queue_count++; 1293 error = 0; 1294 1295 /* 1296 * If we don't have a free AIO process, and we are below our quota, then 1297 * start one. Otherwise, depend on the subsequent I/O completions to 1298 * pick-up this job. If we don't successfully create the new process 1299 * (thread) due to resource issues, we return an error for now (EAGAIN), 1300 * which is likely not the correct thing to do. 1301 */ 1302 crit_enter(); 1303 retryproc: 1304 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1305 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1306 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1307 aiop->aioprocflags &= ~AIOP_FREE; 1308 wakeup(aiop->aioproc); 1309 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && 1310 ((ki->kaio_active_count + num_aio_resv_start) < 1311 ki->kaio_maxactive_count)) { 1312 num_aio_resv_start++; 1313 if ((error = aio_newproc()) == 0) { 1314 num_aio_resv_start--; 1315 goto retryproc; 1316 } 1317 num_aio_resv_start--; 1318 } 1319 crit_exit(); 1320 done: 1321 return error; 1322 } 1323 1324 /* 1325 * This routine queues an AIO request, checking for quotas. 1326 */ 1327 static int 1328 aio_aqueue(struct aiocb *job, int type) 1329 { 1330 struct proc *p = curproc; 1331 struct kaioinfo *ki; 1332 1333 if (p->p_aioinfo == NULL) 1334 aio_init_aioinfo(p); 1335 1336 if (num_queue_count >= max_queue_count) 1337 return EAGAIN; 1338 1339 ki = p->p_aioinfo; 1340 if (ki->kaio_queue_count >= ki->kaio_qallowed_count) 1341 return EAGAIN; 1342 1343 return _aio_aqueue(job, NULL, type); 1344 } 1345 #endif /* VFS_AIO */ 1346 1347 /* 1348 * Support the aio_return system call, as a side-effect, kernel resources are 1349 * released. 1350 * 1351 * MPALMOSTSAFE 1352 */ 1353 int 1354 sys_aio_return(struct aio_return_args *uap) 1355 { 1356 #ifndef VFS_AIO 1357 return (ENOSYS); 1358 #else 1359 struct proc *p = curproc; 1360 struct lwp *lp = curthread->td_lwp; 1361 long jobref; 1362 struct aiocblist *cb, *ncb; 1363 struct aiocb *ujob; 1364 struct kaioinfo *ki; 1365 int error; 1366 1367 ki = p->p_aioinfo; 1368 if (ki == NULL) 1369 return EINVAL; 1370 1371 ujob = uap->aiocbp; 1372 1373 jobref = fuword(&ujob->_aiocb_private.kernelinfo); 1374 if (jobref == -1 || jobref == 0) 1375 return EINVAL; 1376 1377 get_mplock(); 1378 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1379 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == 1380 jobref) { 1381 if (ujob == cb->uuaiocb) { 1382 uap->sysmsg_result = 1383 cb->uaiocb._aiocb_private.status; 1384 } else { 1385 uap->sysmsg_result = EFAULT; 1386 } 1387 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 1388 lp->lwp_ru.ru_oublock += cb->outputcharge; 1389 cb->outputcharge = 0; 1390 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 1391 lp->lwp_ru.ru_inblock += cb->inputcharge; 1392 cb->inputcharge = 0; 1393 } 1394 aio_free_entry(cb); 1395 error = 0; 1396 goto done; 1397 } 1398 } 1399 crit_enter(); 1400 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) { 1401 ncb = TAILQ_NEXT(cb, plist); 1402 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) 1403 == jobref) { 1404 crit_exit(); 1405 if (ujob == cb->uuaiocb) { 1406 uap->sysmsg_result = 1407 cb->uaiocb._aiocb_private.status; 1408 } else { 1409 uap->sysmsg_result = EFAULT; 1410 } 1411 aio_free_entry(cb); 1412 error = 0; 1413 goto done; 1414 } 1415 } 1416 crit_exit(); 1417 error = EINVAL; 1418 done: 1419 rel_mplock(); 1420 return (error); 1421 #endif /* VFS_AIO */ 1422 } 1423 1424 /* 1425 * Allow a process to wakeup when any of the I/O requests are completed. 1426 * 1427 * MPALMOSTSAFE 1428 */ 1429 int 1430 sys_aio_suspend(struct aio_suspend_args *uap) 1431 { 1432 #ifndef VFS_AIO 1433 return ENOSYS; 1434 #else 1435 struct proc *p = curproc; 1436 struct timeval atv; 1437 struct timespec ts; 1438 struct aiocb *const *cbptr, *cbp; 1439 struct kaioinfo *ki; 1440 struct aiocblist *cb; 1441 int i; 1442 int njoblist; 1443 int error, timo; 1444 long *ijoblist; 1445 struct aiocb **ujoblist; 1446 1447 if ((u_int)uap->nent > AIO_LISTIO_MAX) 1448 return EINVAL; 1449 1450 timo = 0; 1451 if (uap->timeout) { 1452 /* Get timespec struct. */ 1453 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 1454 return error; 1455 1456 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) 1457 return (EINVAL); 1458 1459 TIMESPEC_TO_TIMEVAL(&atv, &ts); 1460 if (itimerfix(&atv)) 1461 return (EINVAL); 1462 timo = tvtohz_high(&atv); 1463 } 1464 1465 ki = p->p_aioinfo; 1466 if (ki == NULL) 1467 return EAGAIN; 1468 1469 get_mplock(); 1470 1471 njoblist = 0; 1472 ijoblist = zalloc(aiol_zone); 1473 ujoblist = zalloc(aiol_zone); 1474 cbptr = uap->aiocbp; 1475 1476 for (i = 0; i < uap->nent; i++) { 1477 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1478 if (cbp == 0) 1479 continue; 1480 ujoblist[njoblist] = cbp; 1481 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo); 1482 njoblist++; 1483 } 1484 1485 if (njoblist == 0) { 1486 zfree(aiol_zone, ijoblist); 1487 zfree(aiol_zone, ujoblist); 1488 error = 0; 1489 goto done; 1490 } 1491 1492 error = 0; 1493 for (;;) { 1494 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1495 for (i = 0; i < njoblist; i++) { 1496 if (((intptr_t) 1497 cb->uaiocb._aiocb_private.kernelinfo) == 1498 ijoblist[i]) { 1499 if (ujoblist[i] != cb->uuaiocb) 1500 error = EINVAL; 1501 zfree(aiol_zone, ijoblist); 1502 zfree(aiol_zone, ujoblist); 1503 goto done; 1504 } 1505 } 1506 } 1507 1508 crit_enter(); 1509 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = 1510 TAILQ_NEXT(cb, plist)) { 1511 for (i = 0; i < njoblist; i++) { 1512 if (((intptr_t) 1513 cb->uaiocb._aiocb_private.kernelinfo) == 1514 ijoblist[i]) { 1515 crit_exit(); 1516 if (ujoblist[i] != cb->uuaiocb) 1517 error = EINVAL; 1518 zfree(aiol_zone, ijoblist); 1519 zfree(aiol_zone, ujoblist); 1520 goto done; 1521 } 1522 } 1523 } 1524 1525 ki->kaio_flags |= KAIO_WAKEUP; 1526 error = tsleep(p, PCATCH, "aiospn", timo); 1527 crit_exit(); 1528 1529 if (error == ERESTART || error == EINTR) { 1530 zfree(aiol_zone, ijoblist); 1531 zfree(aiol_zone, ujoblist); 1532 error = EINTR; 1533 goto done; 1534 } else if (error == EWOULDBLOCK) { 1535 zfree(aiol_zone, ijoblist); 1536 zfree(aiol_zone, ujoblist); 1537 error = EAGAIN; 1538 goto done; 1539 } 1540 } 1541 1542 /* NOTREACHED */ 1543 error = EINVAL; 1544 done: 1545 rel_mplock(); 1546 return (error); 1547 #endif /* VFS_AIO */ 1548 } 1549 1550 /* 1551 * aio_cancel cancels any non-physio aio operations not currently in 1552 * progress. 1553 * 1554 * MPALMOSTSAFE 1555 */ 1556 int 1557 sys_aio_cancel(struct aio_cancel_args *uap) 1558 { 1559 #ifndef VFS_AIO 1560 return ENOSYS; 1561 #else 1562 struct proc *p = curproc; 1563 struct kaioinfo *ki; 1564 struct aiocblist *cbe, *cbn; 1565 struct file *fp; 1566 struct socket *so; 1567 struct proc *po; 1568 int error; 1569 int cancelled=0; 1570 int notcancelled=0; 1571 struct vnode *vp; 1572 1573 fp = holdfp(p->p_fd, uap->fd, -1); 1574 if (fp == NULL) 1575 return (EBADF); 1576 1577 get_mplock(); 1578 1579 if (fp->f_type == DTYPE_VNODE) { 1580 vp = (struct vnode *)fp->f_data; 1581 1582 if (vn_isdisk(vp,&error)) { 1583 uap->sysmsg_result = AIO_NOTCANCELED; 1584 error = 0; 1585 goto done2; 1586 } 1587 } else if (fp->f_type == DTYPE_SOCKET) { 1588 so = (struct socket *)fp->f_data; 1589 1590 crit_enter(); 1591 1592 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) { 1593 cbn = TAILQ_NEXT(cbe, list); 1594 if ((uap->aiocbp == NULL) || 1595 (uap->aiocbp == cbe->uuaiocb) ) { 1596 po = cbe->userproc; 1597 ki = po->p_aioinfo; 1598 TAILQ_REMOVE(&so->so_aiojobq, cbe, list); 1599 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist); 1600 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist); 1601 if (ki->kaio_flags & KAIO_WAKEUP) { 1602 wakeup(po); 1603 } 1604 cbe->jobstate = JOBST_JOBFINISHED; 1605 cbe->uaiocb._aiocb_private.status=-1; 1606 cbe->uaiocb._aiocb_private.error=ECANCELED; 1607 cancelled++; 1608 /* XXX cancelled, knote? */ 1609 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1610 SIGEV_SIGNAL) 1611 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1612 if (uap->aiocbp) 1613 break; 1614 } 1615 } 1616 crit_exit(); 1617 1618 if ((cancelled) && (uap->aiocbp)) { 1619 uap->sysmsg_result = AIO_CANCELED; 1620 error = 0; 1621 goto done2; 1622 } 1623 } 1624 ki=p->p_aioinfo; 1625 if (ki == NULL) 1626 goto done; 1627 crit_enter(); 1628 1629 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) { 1630 cbn = TAILQ_NEXT(cbe, plist); 1631 1632 if ((uap->fd == cbe->uaiocb.aio_fildes) && 1633 ((uap->aiocbp == NULL ) || 1634 (uap->aiocbp == cbe->uuaiocb))) { 1635 1636 if (cbe->jobstate == JOBST_JOBQGLOBAL) { 1637 TAILQ_REMOVE(&aio_jobs, cbe, list); 1638 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); 1639 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, 1640 plist); 1641 cancelled++; 1642 ki->kaio_queue_finished_count++; 1643 cbe->jobstate = JOBST_JOBFINISHED; 1644 cbe->uaiocb._aiocb_private.status = -1; 1645 cbe->uaiocb._aiocb_private.error = ECANCELED; 1646 /* XXX cancelled, knote? */ 1647 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1648 SIGEV_SIGNAL) 1649 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1650 } else { 1651 notcancelled++; 1652 } 1653 } 1654 } 1655 crit_exit(); 1656 done: 1657 if (notcancelled) 1658 uap->sysmsg_result = AIO_NOTCANCELED; 1659 else if (cancelled) 1660 uap->sysmsg_result = AIO_CANCELED; 1661 else 1662 uap->sysmsg_result = AIO_ALLDONE; 1663 error = 0; 1664 done2: 1665 rel_mplock(); 1666 fdrop(fp); 1667 return error; 1668 #endif /* VFS_AIO */ 1669 } 1670 1671 /* 1672 * aio_error is implemented in the kernel level for compatibility purposes only. 1673 * For a user mode async implementation, it would be best to do it in a userland 1674 * subroutine. 1675 * 1676 * MPALMOSTSAFE 1677 */ 1678 int 1679 sys_aio_error(struct aio_error_args *uap) 1680 { 1681 #ifndef VFS_AIO 1682 return ENOSYS; 1683 #else 1684 struct proc *p = curproc; 1685 struct aiocblist *cb; 1686 struct kaioinfo *ki; 1687 long jobref; 1688 int error; 1689 1690 ki = p->p_aioinfo; 1691 if (ki == NULL) 1692 return EINVAL; 1693 1694 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo); 1695 if ((jobref == -1) || (jobref == 0)) 1696 return EINVAL; 1697 1698 get_mplock(); 1699 error = 0; 1700 1701 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1702 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1703 jobref) { 1704 uap->sysmsg_result = cb->uaiocb._aiocb_private.error; 1705 goto done; 1706 } 1707 } 1708 1709 crit_enter(); 1710 1711 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb, 1712 plist)) { 1713 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1714 jobref) { 1715 uap->sysmsg_result = EINPROGRESS; 1716 crit_exit(); 1717 goto done; 1718 } 1719 } 1720 1721 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb, 1722 plist)) { 1723 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1724 jobref) { 1725 uap->sysmsg_result = EINPROGRESS; 1726 crit_exit(); 1727 goto done; 1728 } 1729 } 1730 crit_exit(); 1731 1732 crit_enter(); 1733 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, 1734 plist)) { 1735 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1736 jobref) { 1737 uap->sysmsg_result = cb->uaiocb._aiocb_private.error; 1738 crit_exit(); 1739 goto done; 1740 } 1741 } 1742 1743 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb, 1744 plist)) { 1745 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1746 jobref) { 1747 uap->sysmsg_result = EINPROGRESS; 1748 crit_exit(); 1749 goto done; 1750 } 1751 } 1752 crit_exit(); 1753 error = EINVAL; 1754 done: 1755 rel_mplock(); 1756 return (error); 1757 #endif /* VFS_AIO */ 1758 } 1759 1760 /* 1761 * syscall - asynchronous read from a file (REALTIME) 1762 * 1763 * MPALMOSTSAFE 1764 */ 1765 int 1766 sys_aio_read(struct aio_read_args *uap) 1767 { 1768 #ifndef VFS_AIO 1769 return ENOSYS; 1770 #else 1771 int error; 1772 1773 get_mplock(); 1774 error = aio_aqueue(uap->aiocbp, LIO_READ); 1775 rel_mplock(); 1776 return (error); 1777 #endif /* VFS_AIO */ 1778 } 1779 1780 /* 1781 * syscall - asynchronous write to a file (REALTIME) 1782 * 1783 * MPALMOSTSAFE 1784 */ 1785 int 1786 sys_aio_write(struct aio_write_args *uap) 1787 { 1788 #ifndef VFS_AIO 1789 return ENOSYS; 1790 #else 1791 int error; 1792 1793 get_mplock(); 1794 error = aio_aqueue(uap->aiocbp, LIO_WRITE); 1795 rel_mplock(); 1796 return (error); 1797 #endif /* VFS_AIO */ 1798 } 1799 1800 /* 1801 * syscall - XXX undocumented 1802 * 1803 * MPALMOSTSAFE 1804 */ 1805 int 1806 sys_lio_listio(struct lio_listio_args *uap) 1807 { 1808 #ifndef VFS_AIO 1809 return ENOSYS; 1810 #else 1811 struct proc *p = curproc; 1812 struct lwp *lp = curthread->td_lwp; 1813 int nent, nentqueued; 1814 struct aiocb *iocb, * const *cbptr; 1815 struct aiocblist *cb; 1816 struct kaioinfo *ki; 1817 struct aio_liojob *lj; 1818 int error, runningcode; 1819 int nerror; 1820 int i; 1821 1822 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 1823 return EINVAL; 1824 1825 nent = uap->nent; 1826 if (nent > AIO_LISTIO_MAX) 1827 return EINVAL; 1828 1829 get_mplock(); 1830 1831 if (p->p_aioinfo == NULL) 1832 aio_init_aioinfo(p); 1833 1834 if ((nent + num_queue_count) > max_queue_count) { 1835 error = EAGAIN; 1836 goto done; 1837 } 1838 1839 ki = p->p_aioinfo; 1840 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) { 1841 error = EAGAIN; 1842 goto done; 1843 } 1844 1845 lj = zalloc(aiolio_zone); 1846 if (lj == NULL) { 1847 error = EAGAIN; 1848 goto done; 1849 } 1850 1851 lj->lioj_flags = 0; 1852 lj->lioj_buffer_count = 0; 1853 lj->lioj_buffer_finished_count = 0; 1854 lj->lioj_queue_count = 0; 1855 lj->lioj_queue_finished_count = 0; 1856 lj->lioj_ki = ki; 1857 1858 /* 1859 * Setup signal. 1860 */ 1861 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 1862 error = copyin(uap->sig, &lj->lioj_signal, 1863 sizeof(lj->lioj_signal)); 1864 if (error) { 1865 zfree(aiolio_zone, lj); 1866 goto done; 1867 } 1868 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 1869 zfree(aiolio_zone, lj); 1870 error = EINVAL; 1871 goto done; 1872 } 1873 lj->lioj_flags |= LIOJ_SIGNAL; 1874 lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED; 1875 } else 1876 lj->lioj_flags &= ~LIOJ_SIGNAL; 1877 1878 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 1879 /* 1880 * Get pointers to the list of I/O requests. 1881 */ 1882 nerror = 0; 1883 nentqueued = 0; 1884 cbptr = uap->acb_list; 1885 for (i = 0; i < uap->nent; i++) { 1886 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1887 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) { 1888 error = _aio_aqueue(iocb, lj, 0); 1889 if (error == 0) 1890 nentqueued++; 1891 else 1892 nerror++; 1893 } 1894 } 1895 1896 /* 1897 * If we haven't queued any, then just return error. 1898 */ 1899 if (nentqueued == 0) { 1900 error = 0; 1901 goto done; 1902 } 1903 1904 /* 1905 * Calculate the appropriate error return. 1906 */ 1907 runningcode = 0; 1908 if (nerror) 1909 runningcode = EIO; 1910 1911 if (uap->mode == LIO_WAIT) { 1912 int command, found, jobref; 1913 1914 for (;;) { 1915 found = 0; 1916 for (i = 0; i < uap->nent; i++) { 1917 /* 1918 * Fetch address of the control buf pointer in 1919 * user space. 1920 */ 1921 iocb = (struct aiocb *) 1922 (intptr_t)fuword(&cbptr[i]); 1923 if (((intptr_t)iocb == -1) || ((intptr_t)iocb 1924 == 0)) 1925 continue; 1926 1927 /* 1928 * Fetch the associated command from user space. 1929 */ 1930 command = fuword(&iocb->aio_lio_opcode); 1931 if (command == LIO_NOP) { 1932 found++; 1933 continue; 1934 } 1935 1936 jobref = fuword(&iocb->_aiocb_private.kernelinfo); 1937 1938 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1939 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 1940 == jobref) { 1941 if (cb->uaiocb.aio_lio_opcode 1942 == LIO_WRITE) { 1943 lp->lwp_ru.ru_oublock += 1944 cb->outputcharge; 1945 cb->outputcharge = 0; 1946 } else if (cb->uaiocb.aio_lio_opcode 1947 == LIO_READ) { 1948 lp->lwp_ru.ru_inblock += 1949 cb->inputcharge; 1950 cb->inputcharge = 0; 1951 } 1952 found++; 1953 break; 1954 } 1955 } 1956 1957 crit_enter(); 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 crit_exit(); 1966 } 1967 1968 /* 1969 * If all I/Os have been disposed of, then we can 1970 * return. 1971 */ 1972 if (found == nentqueued) { 1973 error = runningcode; 1974 goto done; 1975 } 1976 1977 ki->kaio_flags |= KAIO_WAKEUP; 1978 error = tsleep(p, PCATCH, "aiospn", 0); 1979 1980 if (error == EINTR) { 1981 goto done; 1982 } else if (error == EWOULDBLOCK) { 1983 error = EAGAIN; 1984 goto done; 1985 } 1986 } 1987 } 1988 1989 error = runningcode; 1990 done: 1991 rel_mplock(); 1992 return (error); 1993 #endif /* VFS_AIO */ 1994 } 1995 1996 #ifdef VFS_AIO 1997 /* 1998 * This is a weird hack so that we can post a signal. It is safe to do so from 1999 * a timeout routine, but *not* from an interrupt routine. 2000 */ 2001 static void 2002 process_signal(void *aioj) 2003 { 2004 struct aiocblist *aiocbe = aioj; 2005 struct aio_liojob *lj = aiocbe->lio; 2006 struct aiocb *cb = &aiocbe->uaiocb; 2007 2008 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) && 2009 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) { 2010 ksignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo); 2011 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2012 } 2013 2014 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) 2015 ksignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo); 2016 } 2017 2018 /* 2019 * Interrupt handler for physio, performs the necessary process wakeups, and 2020 * signals. 2021 */ 2022 static void 2023 aio_physwakeup(struct bio *bio) 2024 { 2025 struct buf *bp = bio->bio_buf; 2026 struct aiocblist *aiocbe; 2027 struct proc *p; 2028 struct kaioinfo *ki; 2029 struct aio_liojob *lj; 2030 2031 aiocbe = bio->bio_caller_info2.ptr; 2032 get_mplock(); 2033 2034 if (aiocbe) { 2035 p = bio->bio_caller_info1.ptr; 2036 2037 aiocbe->jobstate = JOBST_JOBBFINISHED; 2038 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; 2039 aiocbe->uaiocb._aiocb_private.error = 0; 2040 aiocbe->jobflags |= AIOCBLIST_DONE; 2041 2042 if (bp->b_flags & B_ERROR) 2043 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 2044 2045 lj = aiocbe->lio; 2046 if (lj) { 2047 lj->lioj_buffer_finished_count++; 2048 2049 /* 2050 * wakeup/signal if all of the interrupt jobs are done. 2051 */ 2052 if (lj->lioj_buffer_finished_count == 2053 lj->lioj_buffer_count) { 2054 /* 2055 * Post a signal if it is called for. 2056 */ 2057 if ((lj->lioj_flags & 2058 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == 2059 LIOJ_SIGNAL) { 2060 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2061 callout_reset(&aiocbe->timeout, 0, 2062 process_signal, aiocbe); 2063 } 2064 } 2065 } 2066 2067 ki = p->p_aioinfo; 2068 if (ki) { 2069 ki->kaio_buffer_finished_count++; 2070 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 2071 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 2072 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 2073 2074 KNOTE(&aiocbe->klist, 0); 2075 /* Do the wakeup. */ 2076 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) { 2077 ki->kaio_flags &= ~KAIO_WAKEUP; 2078 wakeup(p); 2079 } 2080 } 2081 2082 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 2083 callout_reset(&aiocbe->timeout, 0, 2084 process_signal, aiocbe); 2085 } 2086 } 2087 biodone_sync(bio); 2088 rel_mplock(); 2089 } 2090 #endif /* VFS_AIO */ 2091 2092 /* 2093 * syscall - wait for the next completion of an aio request 2094 * 2095 * MPALMOSTSAFE 2096 */ 2097 int 2098 sys_aio_waitcomplete(struct aio_waitcomplete_args *uap) 2099 { 2100 #ifndef VFS_AIO 2101 return ENOSYS; 2102 #else 2103 struct proc *p = curproc; 2104 struct lwp *lp = curthread->td_lwp; 2105 struct timeval atv; 2106 struct timespec ts; 2107 struct kaioinfo *ki; 2108 struct aiocblist *cb = NULL; 2109 int error, timo; 2110 2111 suword(uap->aiocbp, (int)NULL); 2112 2113 timo = 0; 2114 if (uap->timeout) { 2115 /* Get timespec struct. */ 2116 error = copyin(uap->timeout, &ts, sizeof(ts)); 2117 if (error) 2118 return error; 2119 2120 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000)) 2121 return (EINVAL); 2122 2123 TIMESPEC_TO_TIMEVAL(&atv, &ts); 2124 if (itimerfix(&atv)) 2125 return (EINVAL); 2126 timo = tvtohz_high(&atv); 2127 } 2128 2129 ki = p->p_aioinfo; 2130 if (ki == NULL) 2131 return EAGAIN; 2132 2133 get_mplock(); 2134 2135 for (;;) { 2136 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) { 2137 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2138 uap->sysmsg_result = cb->uaiocb._aiocb_private.status; 2139 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 2140 lp->lwp_ru.ru_oublock += 2141 cb->outputcharge; 2142 cb->outputcharge = 0; 2143 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 2144 lp->lwp_ru.ru_inblock += cb->inputcharge; 2145 cb->inputcharge = 0; 2146 } 2147 aio_free_entry(cb); 2148 error = cb->uaiocb._aiocb_private.error; 2149 break; 2150 } 2151 2152 crit_enter(); 2153 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) { 2154 crit_exit(); 2155 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2156 uap->sysmsg_result = cb->uaiocb._aiocb_private.status; 2157 aio_free_entry(cb); 2158 error = cb->uaiocb._aiocb_private.error; 2159 break; 2160 } 2161 2162 ki->kaio_flags |= KAIO_WAKEUP; 2163 error = tsleep(p, PCATCH, "aiowc", timo); 2164 crit_exit(); 2165 2166 if (error == ERESTART) { 2167 error = EINTR; 2168 break; 2169 } 2170 if (error < 0) 2171 break; 2172 if (error == EINTR) 2173 break; 2174 if (error == EWOULDBLOCK) { 2175 error = EAGAIN; 2176 break; 2177 } 2178 } 2179 rel_mplock(); 2180 return (error); 2181 #endif /* VFS_AIO */ 2182 } 2183 2184 #ifndef VFS_AIO 2185 static int 2186 filt_aioattach(struct knote *kn) 2187 { 2188 2189 return (ENXIO); 2190 } 2191 2192 struct filterops aio_filtops = 2193 { 0, filt_aioattach, NULL, NULL }; 2194 2195 #else 2196 /* kqueue attach function */ 2197 static int 2198 filt_aioattach(struct knote *kn) 2199 { 2200 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2201 2202 /* 2203 * The aiocbe pointer must be validated before using it, so 2204 * registration is restricted to the kernel; the user cannot 2205 * set EV_FLAG1. 2206 */ 2207 if ((kn->kn_flags & EV_FLAG1) == 0) 2208 return (EPERM); 2209 kn->kn_flags &= ~EV_FLAG1; 2210 2211 knote_insert(&aiocbe->klist, kn); 2212 2213 return (0); 2214 } 2215 2216 /* kqueue detach function */ 2217 static void 2218 filt_aiodetach(struct knote *kn) 2219 { 2220 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2221 2222 knote_remove(&aiocbe->klist, kn); 2223 } 2224 2225 /* kqueue filter function */ 2226 /*ARGSUSED*/ 2227 static int 2228 filt_aio(struct knote *kn, long hint) 2229 { 2230 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2231 2232 kn->kn_data = aiocbe->uaiocb._aiocb_private.error; 2233 if (aiocbe->jobstate != JOBST_JOBFINISHED && 2234 aiocbe->jobstate != JOBST_JOBBFINISHED) 2235 return (0); 2236 kn->kn_flags |= EV_EOF; 2237 return (1); 2238 } 2239 2240 struct filterops aio_filtops = 2241 { 0, filt_aioattach, filt_aiodetach, filt_aio }; 2242 #endif /* VFS_AIO */ 2243