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 #include <sys/file2.h> 51 #include <sys/buf2.h> 52 #include <sys/sysref2.h> 53 #include <sys/thread2.h> 54 55 #include <machine/limits.h> 56 #include "opt_vfs_aio.h" 57 58 #ifdef VFS_AIO 59 60 /* 61 * Counter for allocating reference ids to new jobs. Wrapped to 1 on 62 * overflow. 63 */ 64 static long jobrefid; 65 66 #define JOBST_NULL 0x0 67 #define JOBST_JOBQGLOBAL 0x2 68 #define JOBST_JOBRUNNING 0x3 69 #define JOBST_JOBFINISHED 0x4 70 #define JOBST_JOBQBUF 0x5 71 #define JOBST_JOBBFINISHED 0x6 72 73 #ifndef MAX_AIO_PER_PROC 74 #define MAX_AIO_PER_PROC 32 75 #endif 76 77 #ifndef MAX_AIO_QUEUE_PER_PROC 78 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */ 79 #endif 80 81 #ifndef MAX_AIO_PROCS 82 #define MAX_AIO_PROCS 32 83 #endif 84 85 #ifndef MAX_AIO_QUEUE 86 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */ 87 #endif 88 89 #ifndef TARGET_AIO_PROCS 90 #define TARGET_AIO_PROCS 4 91 #endif 92 93 #ifndef MAX_BUF_AIO 94 #define MAX_BUF_AIO 16 95 #endif 96 97 #ifndef AIOD_TIMEOUT_DEFAULT 98 #define AIOD_TIMEOUT_DEFAULT (10 * hz) 99 #endif 100 101 #ifndef AIOD_LIFETIME_DEFAULT 102 #define AIOD_LIFETIME_DEFAULT (30 * hz) 103 #endif 104 105 SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management"); 106 107 static int max_aio_procs = MAX_AIO_PROCS; 108 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, 109 CTLFLAG_RW, &max_aio_procs, 0, 110 "Maximum number of kernel threads to use for handling async IO"); 111 112 static int num_aio_procs = 0; 113 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, 114 CTLFLAG_RD, &num_aio_procs, 0, 115 "Number of presently active kernel threads for async IO"); 116 117 /* 118 * The code will adjust the actual number of AIO processes towards this 119 * number when it gets a chance. 120 */ 121 static int target_aio_procs = TARGET_AIO_PROCS; 122 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 123 0, "Preferred number of ready kernel threads for async IO"); 124 125 static int max_queue_count = MAX_AIO_QUEUE; 126 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, 127 "Maximum number of aio requests to queue, globally"); 128 129 static int num_queue_count = 0; 130 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, 131 "Number of queued aio requests"); 132 133 static int num_buf_aio = 0; 134 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, 135 "Number of aio requests presently handled by the buf subsystem"); 136 137 /* Number of async I/O thread in the process of being started */ 138 /* XXX This should be local to _aio_aqueue() */ 139 static int num_aio_resv_start = 0; 140 141 static int aiod_timeout; 142 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0, 143 "Timeout value for synchronous aio operations"); 144 145 static int aiod_lifetime; 146 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, 147 "Maximum lifetime for idle aiod"); 148 149 static int max_aio_per_proc = MAX_AIO_PER_PROC; 150 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 151 0, "Maximum active aio requests per process (stored in the process)"); 152 153 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 154 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, 155 &max_aio_queue_per_proc, 0, 156 "Maximum queued aio requests per process (stored in the process)"); 157 158 static int max_buf_aio = MAX_BUF_AIO; 159 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, 160 "Maximum buf aio requests per process (stored in the process)"); 161 162 /* 163 * AIO process info 164 */ 165 #define AIOP_FREE 0x1 /* proc on free queue */ 166 #define AIOP_SCHED 0x2 /* proc explicitly scheduled */ 167 168 struct aioproclist { 169 int aioprocflags; /* AIO proc flags */ 170 TAILQ_ENTRY(aioproclist) list; /* List of processes */ 171 struct proc *aioproc; /* The AIO thread */ 172 }; 173 174 /* 175 * data-structure for lio signal management 176 */ 177 struct aio_liojob { 178 int lioj_flags; 179 int lioj_buffer_count; 180 int lioj_buffer_finished_count; 181 int lioj_queue_count; 182 int lioj_queue_finished_count; 183 struct sigevent lioj_signal; /* signal on all I/O done */ 184 TAILQ_ENTRY(aio_liojob) lioj_list; 185 struct kaioinfo *lioj_ki; 186 }; 187 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ 188 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ 189 190 /* 191 * per process aio data structure 192 */ 193 struct kaioinfo { 194 int kaio_flags; /* per process kaio flags */ 195 int kaio_maxactive_count; /* maximum number of AIOs */ 196 int kaio_active_count; /* number of currently used AIOs */ 197 int kaio_qallowed_count; /* maxiumu size of AIO queue */ 198 int kaio_queue_count; /* size of AIO queue */ 199 int kaio_ballowed_count; /* maximum number of buffers */ 200 int kaio_queue_finished_count; /* number of daemon jobs finished */ 201 int kaio_buffer_count; /* number of physio buffers */ 202 int kaio_buffer_finished_count; /* count of I/O done */ 203 struct proc *kaio_p; /* process that uses this kaio block */ 204 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */ 205 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */ 206 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */ 207 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */ 208 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */ 209 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */ 210 }; 211 212 #define KAIO_RUNDOWN 0x1 /* process is being run down */ 213 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ 214 215 static TAILQ_HEAD(,aioproclist) aio_freeproc, aio_activeproc; 216 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */ 217 static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */ 218 static TAILQ_HEAD(,aiocblist) aio_freejobs; /* Pool of free jobs */ 219 220 static void aio_init_aioinfo(struct proc *p); 221 static void aio_onceonly(void *); 222 static int aio_free_entry(struct aiocblist *aiocbe); 223 static void aio_process(struct aiocblist *aiocbe); 224 static int aio_newproc(void); 225 static int aio_aqueue(struct aiocb *job, int type); 226 static void aio_physwakeup(struct bio *bio); 227 static int aio_fphysio(struct aiocblist *aiocbe); 228 static int aio_qphysio(struct proc *p, struct aiocblist *iocb); 229 static void aio_daemon(void *uproc, struct trapframe *frame); 230 static void process_signal(void *aioj); 231 232 SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL); 233 234 /* 235 * Zones for: 236 * kaio Per process async io info 237 * aiop async io thread data 238 * aiocb async io jobs 239 * aiol list io job pointer - internal to aio_suspend XXX 240 * aiolio list io jobs 241 */ 242 static vm_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone; 243 244 /* 245 * Startup initialization 246 */ 247 static void 248 aio_onceonly(void *na) 249 { 250 TAILQ_INIT(&aio_freeproc); 251 TAILQ_INIT(&aio_activeproc); 252 TAILQ_INIT(&aio_jobs); 253 TAILQ_INIT(&aio_bufjobs); 254 TAILQ_INIT(&aio_freejobs); 255 kaio_zone = zinit("AIO", sizeof(struct kaioinfo), 0, 0, 1); 256 aiop_zone = zinit("AIOP", sizeof(struct aioproclist), 0, 0, 1); 257 aiocb_zone = zinit("AIOCB", sizeof(struct aiocblist), 0, 0, 1); 258 aiol_zone = zinit("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t), 0, 0, 1); 259 aiolio_zone = zinit("AIOLIO", sizeof(struct aio_liojob), 0, 0, 1); 260 aiod_timeout = AIOD_TIMEOUT_DEFAULT; 261 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 262 jobrefid = 1; 263 } 264 265 /* 266 * Init the per-process aioinfo structure. The aioinfo limits are set 267 * per-process for user limit (resource) management. 268 */ 269 static void 270 aio_init_aioinfo(struct proc *p) 271 { 272 struct kaioinfo *ki; 273 if (p->p_aioinfo == NULL) { 274 ki = zalloc(kaio_zone); 275 p->p_aioinfo = ki; 276 ki->kaio_flags = 0; 277 ki->kaio_maxactive_count = max_aio_per_proc; 278 ki->kaio_active_count = 0; 279 ki->kaio_qallowed_count = max_aio_queue_per_proc; 280 ki->kaio_queue_count = 0; 281 ki->kaio_ballowed_count = max_buf_aio; 282 ki->kaio_buffer_count = 0; 283 ki->kaio_buffer_finished_count = 0; 284 ki->kaio_p = p; 285 TAILQ_INIT(&ki->kaio_jobdone); 286 TAILQ_INIT(&ki->kaio_jobqueue); 287 TAILQ_INIT(&ki->kaio_bufdone); 288 TAILQ_INIT(&ki->kaio_bufqueue); 289 TAILQ_INIT(&ki->kaio_liojoblist); 290 TAILQ_INIT(&ki->kaio_sockqueue); 291 } 292 293 while (num_aio_procs < target_aio_procs) 294 aio_newproc(); 295 } 296 297 /* 298 * Free a job entry. Wait for completion if it is currently active, but don't 299 * delay forever. If we delay, we return a flag that says that we have to 300 * restart the queue scan. 301 */ 302 static int 303 aio_free_entry(struct aiocblist *aiocbe) 304 { 305 struct kaioinfo *ki; 306 struct aio_liojob *lj; 307 struct proc *p; 308 int error; 309 310 if (aiocbe->jobstate == JOBST_NULL) 311 panic("aio_free_entry: freeing already free job"); 312 313 p = aiocbe->userproc; 314 ki = p->p_aioinfo; 315 lj = aiocbe->lio; 316 if (ki == NULL) 317 panic("aio_free_entry: missing p->p_aioinfo"); 318 319 while (aiocbe->jobstate == JOBST_JOBRUNNING) { 320 aiocbe->jobflags |= AIOCBLIST_RUNDOWN; 321 tsleep(aiocbe, 0, "jobwai", 0); 322 } 323 if (aiocbe->bp == NULL) { 324 if (ki->kaio_queue_count <= 0) 325 panic("aio_free_entry: process queue size <= 0"); 326 if (num_queue_count <= 0) 327 panic("aio_free_entry: system wide queue size <= 0"); 328 329 if (lj) { 330 lj->lioj_queue_count--; 331 if (aiocbe->jobflags & AIOCBLIST_DONE) 332 lj->lioj_queue_finished_count--; 333 } 334 ki->kaio_queue_count--; 335 if (aiocbe->jobflags & AIOCBLIST_DONE) 336 ki->kaio_queue_finished_count--; 337 num_queue_count--; 338 } else { 339 if (lj) { 340 lj->lioj_buffer_count--; 341 if (aiocbe->jobflags & AIOCBLIST_DONE) 342 lj->lioj_buffer_finished_count--; 343 } 344 if (aiocbe->jobflags & AIOCBLIST_DONE) 345 ki->kaio_buffer_finished_count--; 346 ki->kaio_buffer_count--; 347 num_buf_aio--; 348 } 349 350 /* aiocbe is going away, we need to destroy any knotes */ 351 /* XXX lwp knote wants a thread, but only cares about the process */ 352 knote_remove(FIRST_LWP_IN_PROC(p)->lwp_thread, &aiocbe->klist); 353 354 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN) 355 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) { 356 ki->kaio_flags &= ~KAIO_WAKEUP; 357 wakeup(p); 358 } 359 360 if (aiocbe->jobstate == JOBST_JOBQBUF) { 361 if ((error = aio_fphysio(aiocbe)) != 0) 362 return error; 363 if (aiocbe->jobstate != JOBST_JOBBFINISHED) 364 panic("aio_free_entry: invalid physio finish-up state"); 365 crit_enter(); 366 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 367 crit_exit(); 368 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) { 369 crit_enter(); 370 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 371 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 372 crit_exit(); 373 } else if (aiocbe->jobstate == JOBST_JOBFINISHED) 374 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist); 375 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) { 376 crit_enter(); 377 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 378 crit_exit(); 379 if (aiocbe->bp) { 380 vunmapbuf(aiocbe->bp); 381 relpbuf(aiocbe->bp, NULL); 382 aiocbe->bp = NULL; 383 } 384 } 385 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) { 386 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 387 zfree(aiolio_zone, lj); 388 } 389 aiocbe->jobstate = JOBST_NULL; 390 callout_stop(&aiocbe->timeout); 391 fdrop(aiocbe->fd_file); 392 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 393 return 0; 394 } 395 #endif /* VFS_AIO */ 396 397 /* 398 * Rundown the jobs for a given process. 399 */ 400 void 401 aio_proc_rundown(struct proc *p) 402 { 403 #ifndef VFS_AIO 404 return; 405 #else 406 struct kaioinfo *ki; 407 struct aio_liojob *lj, *ljn; 408 struct aiocblist *aiocbe, *aiocbn; 409 struct file *fp; 410 struct socket *so; 411 412 ki = p->p_aioinfo; 413 if (ki == NULL) 414 return; 415 416 ki->kaio_flags |= LIOJ_SIGNAL_POSTED; 417 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count > 418 ki->kaio_buffer_finished_count)) { 419 ki->kaio_flags |= KAIO_RUNDOWN; 420 if (tsleep(p, 0, "kaiowt", aiod_timeout)) 421 break; 422 } 423 424 /* 425 * Move any aio ops that are waiting on socket I/O to the normal job 426 * queues so they are cleaned up with any others. 427 */ 428 crit_enter(); 429 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe = 430 aiocbn) { 431 aiocbn = TAILQ_NEXT(aiocbe, plist); 432 fp = aiocbe->fd_file; 433 if (fp != NULL) { 434 so = (struct socket *)fp->f_data; 435 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list); 436 if (TAILQ_EMPTY(&so->so_aiojobq)) { 437 so->so_snd.ssb_flags &= ~SSB_AIO; 438 so->so_rcv.ssb_flags &= ~SSB_AIO; 439 } 440 } 441 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist); 442 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list); 443 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist); 444 } 445 crit_exit(); 446 447 restart1: 448 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) { 449 aiocbn = TAILQ_NEXT(aiocbe, plist); 450 if (aio_free_entry(aiocbe)) 451 goto restart1; 452 } 453 454 restart2: 455 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe = 456 aiocbn) { 457 aiocbn = TAILQ_NEXT(aiocbe, plist); 458 if (aio_free_entry(aiocbe)) 459 goto restart2; 460 } 461 462 restart3: 463 crit_enter(); 464 while (TAILQ_FIRST(&ki->kaio_bufqueue)) { 465 ki->kaio_flags |= KAIO_WAKEUP; 466 tsleep(p, 0, "aioprn", 0); 467 crit_exit(); 468 goto restart3; 469 } 470 crit_exit(); 471 472 restart4: 473 crit_enter(); 474 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) { 475 aiocbn = TAILQ_NEXT(aiocbe, plist); 476 if (aio_free_entry(aiocbe)) { 477 crit_exit(); 478 goto restart4; 479 } 480 } 481 crit_exit(); 482 483 /* 484 * If we've slept, jobs might have moved from one queue to another. 485 * Retry rundown if we didn't manage to empty the queues. 486 */ 487 if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL || 488 TAILQ_FIRST(&ki->kaio_jobqueue) != NULL || 489 TAILQ_FIRST(&ki->kaio_bufqueue) != NULL || 490 TAILQ_FIRST(&ki->kaio_bufdone) != NULL) 491 goto restart1; 492 493 for (lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) { 494 ljn = TAILQ_NEXT(lj, lioj_list); 495 if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 496 0)) { 497 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 498 zfree(aiolio_zone, lj); 499 } else { 500 #ifdef DIAGNOSTIC 501 kprintf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, " 502 "QF:%d\n", lj->lioj_buffer_count, 503 lj->lioj_buffer_finished_count, 504 lj->lioj_queue_count, 505 lj->lioj_queue_finished_count); 506 #endif 507 } 508 } 509 510 zfree(kaio_zone, ki); 511 p->p_aioinfo = NULL; 512 #endif /* VFS_AIO */ 513 } 514 515 #ifdef VFS_AIO 516 /* 517 * Select a job to run (called by an AIO daemon). 518 */ 519 static struct aiocblist * 520 aio_selectjob(struct aioproclist *aiop) 521 { 522 struct aiocblist *aiocbe; 523 struct kaioinfo *ki; 524 struct proc *userp; 525 526 crit_enter(); 527 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe = 528 TAILQ_NEXT(aiocbe, list)) { 529 userp = aiocbe->userproc; 530 ki = userp->p_aioinfo; 531 532 if (ki->kaio_active_count < ki->kaio_maxactive_count) { 533 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 534 crit_exit(); 535 return aiocbe; 536 } 537 } 538 crit_exit(); 539 540 return NULL; 541 } 542 543 /* 544 * The AIO processing activity. This is the code that does the I/O request for 545 * the non-physio version of the operations. The normal vn operations are used, 546 * and this code should work in all instances for every type of file, including 547 * pipes, sockets, fifos, and regular files. 548 */ 549 static void 550 aio_process(struct aiocblist *aiocbe) 551 { 552 struct thread *mytd; 553 struct aiocb *cb; 554 struct file *fp; 555 struct uio auio; 556 struct iovec aiov; 557 int cnt; 558 int error; 559 int oublock_st, oublock_end; 560 int inblock_st, inblock_end; 561 562 mytd = curthread; 563 cb = &aiocbe->uaiocb; 564 fp = aiocbe->fd_file; 565 566 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; 567 aiov.iov_len = cb->aio_nbytes; 568 569 auio.uio_iov = &aiov; 570 auio.uio_iovcnt = 1; 571 auio.uio_offset = cb->aio_offset; 572 auio.uio_resid = cb->aio_nbytes; 573 cnt = cb->aio_nbytes; 574 auio.uio_segflg = UIO_USERSPACE; 575 auio.uio_td = mytd; 576 577 inblock_st = mytd->td_lwp->lwp_ru.ru_inblock; 578 oublock_st = mytd->td_lwp->lwp_ru.ru_oublock; 579 /* 580 * _aio_aqueue() acquires a reference to the file that is 581 * released in aio_free_entry(). 582 */ 583 if (cb->aio_lio_opcode == LIO_READ) { 584 auio.uio_rw = UIO_READ; 585 error = fo_read(fp, &auio, fp->f_cred, O_FOFFSET); 586 } else { 587 auio.uio_rw = UIO_WRITE; 588 error = fo_write(fp, &auio, fp->f_cred, O_FOFFSET); 589 } 590 inblock_end = mytd->td_lwp->lwp_ru.ru_inblock; 591 oublock_end = mytd->td_lwp->lwp_ru.ru_oublock; 592 593 aiocbe->inputcharge = inblock_end - inblock_st; 594 aiocbe->outputcharge = oublock_end - oublock_st; 595 596 if ((error) && (auio.uio_resid != cnt)) { 597 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 598 error = 0; 599 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) 600 ksignal(aiocbe->userproc, SIGPIPE); 601 } 602 603 cnt -= auio.uio_resid; 604 cb->_aiocb_private.error = error; 605 cb->_aiocb_private.status = cnt; 606 } 607 608 /* 609 * The AIO daemon, most of the actual work is done in aio_process, 610 * but the setup (and address space mgmt) is done in this routine. 611 * 612 * The MP lock is held on entry. 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 mylwp = curthread->td_lwp; 628 mycp = mylwp->lwp_proc; 629 630 if (mycp->p_textvp) { 631 vrele(mycp->p_textvp); 632 mycp->p_textvp = NULL; 633 } 634 635 /* 636 * Allocate and ready the aio control info. There is one aiop structure 637 * per daemon. 638 */ 639 aiop = zalloc(aiop_zone); 640 aiop->aioproc = mycp; 641 aiop->aioprocflags |= AIOP_FREE; 642 643 crit_enter(); 644 645 /* 646 * Place thread (lightweight process) onto the AIO free thread list. 647 */ 648 if (TAILQ_EMPTY(&aio_freeproc)) 649 wakeup(&aio_freeproc); 650 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 651 652 crit_exit(); 653 654 /* Make up a name for the daemon. */ 655 strcpy(mycp->p_comm, "aiod"); 656 657 /* 658 * Get rid of our current filedescriptors. AIOD's don't need any 659 * filedescriptors, except as temporarily inherited from the client. 660 * Credentials are also cloned, and made equivalent to "root". 661 */ 662 fdfree(mycp, NULL); 663 cr = cratom(&mycp->p_ucred); 664 cr->cr_uid = 0; 665 uireplace(&cr->cr_uidinfo, uifind(0)); 666 cr->cr_ngroups = 1; 667 cr->cr_groups[0] = 1; 668 669 /* The daemon resides in its own pgrp. */ 670 enterpgrp(mycp, mycp->p_pid, 1); 671 672 /* Mark special process type. */ 673 mycp->p_flag |= P_SYSTEM | P_KTHREADP; 674 675 /* 676 * Wakeup parent process. (Parent sleeps to keep from blasting away 677 * and creating too many daemons.) 678 */ 679 wakeup(mycp); 680 curvm = NULL; 681 682 for (;;) { 683 /* 684 * Take daemon off of free queue 685 */ 686 if (aiop->aioprocflags & AIOP_FREE) { 687 crit_enter(); 688 TAILQ_REMOVE(&aio_freeproc, aiop, list); 689 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 690 aiop->aioprocflags &= ~AIOP_FREE; 691 crit_exit(); 692 } 693 aiop->aioprocflags &= ~AIOP_SCHED; 694 695 /* 696 * Check for jobs. 697 */ 698 while ((aiocbe = aio_selectjob(aiop)) != NULL) { 699 cb = &aiocbe->uaiocb; 700 userp = aiocbe->userproc; 701 702 aiocbe->jobstate = JOBST_JOBRUNNING; 703 704 /* 705 * Connect to process address space for user program. 706 */ 707 if (curvm != userp->p_vmspace) { 708 pmap_setlwpvm(mylwp, userp->p_vmspace); 709 if (curvm) 710 sysref_put(&curvm->vm_sysref); 711 curvm = userp->p_vmspace; 712 sysref_get(&curvm->vm_sysref); 713 } 714 715 ki = userp->p_aioinfo; 716 lj = aiocbe->lio; 717 718 /* Account for currently active jobs. */ 719 ki->kaio_active_count++; 720 721 /* Do the I/O function. */ 722 aio_process(aiocbe); 723 724 /* Decrement the active job count. */ 725 ki->kaio_active_count--; 726 727 /* 728 * Increment the completion count for wakeup/signal 729 * comparisons. 730 */ 731 aiocbe->jobflags |= AIOCBLIST_DONE; 732 ki->kaio_queue_finished_count++; 733 if (lj) 734 lj->lioj_queue_finished_count++; 735 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags 736 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) { 737 ki->kaio_flags &= ~KAIO_WAKEUP; 738 wakeup(userp); 739 } 740 741 crit_enter(); 742 if (lj && (lj->lioj_flags & 743 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) { 744 if ((lj->lioj_queue_finished_count == 745 lj->lioj_queue_count) && 746 (lj->lioj_buffer_finished_count == 747 lj->lioj_buffer_count)) { 748 ksignal(userp, 749 lj->lioj_signal.sigev_signo); 750 lj->lioj_flags |= 751 LIOJ_SIGNAL_POSTED; 752 } 753 } 754 crit_exit(); 755 756 aiocbe->jobstate = JOBST_JOBFINISHED; 757 758 crit_enter(); 759 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 760 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist); 761 crit_exit(); 762 KNOTE(&aiocbe->klist, 0); 763 764 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) { 765 wakeup(aiocbe); 766 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN; 767 } 768 769 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 770 ksignal(userp, cb->aio_sigevent.sigev_signo); 771 } 772 } 773 774 /* 775 * Disconnect from user address space. 776 */ 777 if (curvm) { 778 /* swap our original address space back in */ 779 pmap_setlwpvm(mylwp, mycp->p_vmspace); 780 sysref_put(&curvm->vm_sysref); 781 curvm = NULL; 782 } 783 784 /* 785 * If we are the first to be put onto the free queue, wakeup 786 * anyone waiting for a daemon. 787 */ 788 crit_enter(); 789 TAILQ_REMOVE(&aio_activeproc, aiop, list); 790 if (TAILQ_EMPTY(&aio_freeproc)) 791 wakeup(&aio_freeproc); 792 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 793 aiop->aioprocflags |= AIOP_FREE; 794 crit_exit(); 795 796 /* 797 * If daemon is inactive for a long time, allow it to exit, 798 * thereby freeing resources. 799 */ 800 if (((aiop->aioprocflags & AIOP_SCHED) == 0) && tsleep(mycp, 801 0, "aiordy", aiod_lifetime)) { 802 crit_enter(); 803 if (TAILQ_EMPTY(&aio_jobs)) { 804 if ((aiop->aioprocflags & AIOP_FREE) && 805 (num_aio_procs > target_aio_procs)) { 806 TAILQ_REMOVE(&aio_freeproc, aiop, list); 807 crit_exit(); 808 zfree(aiop_zone, aiop); 809 num_aio_procs--; 810 #ifdef DIAGNOSTIC 811 if (mycp->p_vmspace->vm_sysref.refcnt <= 1) { 812 kprintf("AIOD: bad vm refcnt for" 813 " exiting daemon: %d\n", 814 mycp->p_vmspace->vm_sysref.refcnt); 815 } 816 #endif 817 exit1(0); 818 } 819 } 820 crit_exit(); 821 } 822 } 823 } 824 825 /* 826 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 827 * AIO daemon modifies its environment itself. 828 */ 829 static int 830 aio_newproc(void) 831 { 832 int error; 833 struct lwp *lp, *nlp; 834 struct proc *np; 835 836 lp = &lwp0; 837 error = fork1(lp, RFPROC|RFMEM|RFNOWAIT, &np); 838 if (error) 839 return error; 840 nlp = ONLY_LWP_IN_PROC(np); 841 cpu_set_fork_handler(nlp, aio_daemon, curproc); 842 start_forked_proc(lp, np); 843 844 /* 845 * Wait until daemon is started, but continue on just in case to 846 * handle error conditions. 847 */ 848 error = tsleep(np, 0, "aiosta", aiod_timeout); 849 num_aio_procs++; 850 851 return error; 852 } 853 854 /* 855 * Try the high-performance, low-overhead physio method for eligible 856 * VCHR devices. This method doesn't use an aio helper thread, and 857 * thus has very low overhead. 858 * 859 * Assumes that the caller, _aio_aqueue(), has incremented the file 860 * structure's reference count, preventing its deallocation for the 861 * duration of this call. 862 */ 863 static int 864 aio_qphysio(struct proc *p, struct aiocblist *aiocbe) 865 { 866 int error; 867 struct aiocb *cb; 868 struct file *fp; 869 struct buf *bp; 870 struct vnode *vp; 871 struct kaioinfo *ki; 872 struct aio_liojob *lj; 873 int notify; 874 875 cb = &aiocbe->uaiocb; 876 fp = aiocbe->fd_file; 877 878 if (fp->f_type != DTYPE_VNODE) 879 return (-1); 880 881 vp = (struct vnode *)fp->f_data; 882 883 /* 884 * If its not a disk, we don't want to return a positive error. 885 * It causes the aio code to not fall through to try the thread 886 * way when you're talking to a regular file. 887 */ 888 if (!vn_isdisk(vp, &error)) { 889 if (error == ENOTBLK) 890 return (-1); 891 else 892 return (error); 893 } 894 895 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys) 896 return (-1); 897 898 if (cb->aio_nbytes > 899 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK)) 900 return (-1); 901 902 ki = p->p_aioinfo; 903 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) 904 return (-1); 905 906 ki->kaio_buffer_count++; 907 908 lj = aiocbe->lio; 909 if (lj) 910 lj->lioj_buffer_count++; 911 912 /* Create and build a buffer header for a transfer. */ 913 bp = getpbuf(NULL); 914 BUF_KERNPROC(bp); 915 916 /* 917 * Get a copy of the kva from the physical buffer. 918 */ 919 bp->b_bio1.bio_caller_info1.ptr = p; 920 error = 0; 921 922 bp->b_cmd = (cb->aio_lio_opcode == LIO_WRITE) ? 923 BUF_CMD_WRITE : BUF_CMD_READ; 924 bp->b_bio1.bio_done = aio_physwakeup; 925 bp->b_bio1.bio_offset = cb->aio_offset; 926 927 /* Bring buffer into kernel space. */ 928 if (vmapbuf(bp, __DEVOLATILE(char *, cb->aio_buf), cb->aio_nbytes) < 0) { 929 error = EFAULT; 930 goto doerror; 931 } 932 933 crit_enter(); 934 935 aiocbe->bp = bp; 936 bp->b_bio1.bio_caller_info2.ptr = aiocbe; 937 TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list); 938 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); 939 aiocbe->jobstate = JOBST_JOBQBUF; 940 cb->_aiocb_private.status = cb->aio_nbytes; 941 num_buf_aio++; 942 bp->b_error = 0; 943 944 crit_exit(); 945 946 /* 947 * Perform the transfer. vn_strategy must be used even though we 948 * know we have a device in order to deal with requests which exceed 949 * device DMA limitations. 950 */ 951 vn_strategy(vp, &bp->b_bio1); 952 953 notify = 0; 954 crit_enter(); 955 956 /* 957 * If we had an error invoking the request, or an error in processing 958 * the request before we have returned, we process it as an error in 959 * transfer. Note that such an I/O error is not indicated immediately, 960 * but is returned using the aio_error mechanism. In this case, 961 * aio_suspend will return immediately. 962 */ 963 if (bp->b_error || (bp->b_flags & B_ERROR)) { 964 struct aiocb *job = aiocbe->uuaiocb; 965 966 aiocbe->uaiocb._aiocb_private.status = 0; 967 suword(&job->_aiocb_private.status, 0); 968 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 969 suword(&job->_aiocb_private.error, bp->b_error); 970 971 ki->kaio_buffer_finished_count++; 972 973 if (aiocbe->jobstate != JOBST_JOBBFINISHED) { 974 aiocbe->jobstate = JOBST_JOBBFINISHED; 975 aiocbe->jobflags |= AIOCBLIST_DONE; 976 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 977 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 978 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 979 notify = 1; 980 } 981 } 982 crit_exit(); 983 if (notify) 984 KNOTE(&aiocbe->klist, 0); 985 return 0; 986 987 doerror: 988 ki->kaio_buffer_count--; 989 if (lj) 990 lj->lioj_buffer_count--; 991 aiocbe->bp = NULL; 992 relpbuf(bp, NULL); 993 return error; 994 } 995 996 /* 997 * This waits/tests physio completion. 998 */ 999 static int 1000 aio_fphysio(struct aiocblist *iocb) 1001 { 1002 struct buf *bp; 1003 int error; 1004 1005 bp = iocb->bp; 1006 1007 crit_enter(); 1008 while (bp->b_cmd != BUF_CMD_DONE) { 1009 if (tsleep(bp, 0, "physstr", aiod_timeout)) { 1010 if (bp->b_cmd != BUF_CMD_DONE) { 1011 crit_exit(); 1012 return EINPROGRESS; 1013 } else { 1014 break; 1015 } 1016 } 1017 } 1018 crit_exit(); 1019 1020 /* Release mapping into kernel space. */ 1021 vunmapbuf(bp); 1022 iocb->bp = 0; 1023 1024 error = 0; 1025 1026 /* Check for an error. */ 1027 if (bp->b_flags & B_ERROR) 1028 error = bp->b_error; 1029 1030 relpbuf(bp, NULL); 1031 return (error); 1032 } 1033 #endif /* VFS_AIO */ 1034 1035 /* 1036 * Wake up aio requests that may be serviceable now. 1037 */ 1038 void 1039 aio_swake(struct socket *so, struct signalsockbuf *ssb) 1040 { 1041 #ifndef VFS_AIO 1042 return; 1043 #else 1044 struct aiocblist *cb,*cbn; 1045 struct proc *p; 1046 struct kaioinfo *ki = NULL; 1047 int opcode, wakecount = 0; 1048 struct aioproclist *aiop; 1049 1050 if (ssb == &so->so_snd) { 1051 opcode = LIO_WRITE; 1052 so->so_snd.ssb_flags &= ~SSB_AIO; 1053 } else { 1054 opcode = LIO_READ; 1055 so->so_rcv.ssb_flags &= ~SSB_AIO; 1056 } 1057 1058 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) { 1059 cbn = TAILQ_NEXT(cb, list); 1060 if (opcode == cb->uaiocb.aio_lio_opcode) { 1061 p = cb->userproc; 1062 ki = p->p_aioinfo; 1063 TAILQ_REMOVE(&so->so_aiojobq, cb, list); 1064 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist); 1065 TAILQ_INSERT_TAIL(&aio_jobs, cb, list); 1066 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist); 1067 wakecount++; 1068 if (cb->jobstate != JOBST_JOBQGLOBAL) 1069 panic("invalid queue value"); 1070 } 1071 } 1072 1073 while (wakecount--) { 1074 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) { 1075 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1076 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1077 aiop->aioprocflags &= ~AIOP_FREE; 1078 wakeup(aiop->aioproc); 1079 } 1080 } 1081 #endif /* VFS_AIO */ 1082 } 1083 1084 #ifdef VFS_AIO 1085 /* 1086 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR 1087 * technique is done in this code. 1088 */ 1089 static int 1090 _aio_aqueue(struct aiocb *job, struct aio_liojob *lj, int type) 1091 { 1092 struct proc *p = curproc; 1093 struct filedesc *fdp; 1094 struct file *fp; 1095 unsigned int fd; 1096 struct socket *so; 1097 int error; 1098 int opcode, user_opcode; 1099 struct aiocblist *aiocbe; 1100 struct aioproclist *aiop; 1101 struct kaioinfo *ki; 1102 struct kevent kev; 1103 struct kqueue *kq; 1104 struct file *kq_fp; 1105 1106 if ((aiocbe = TAILQ_FIRST(&aio_freejobs)) != NULL) 1107 TAILQ_REMOVE(&aio_freejobs, aiocbe, list); 1108 else 1109 aiocbe = zalloc (aiocb_zone); 1110 1111 aiocbe->inputcharge = 0; 1112 aiocbe->outputcharge = 0; 1113 callout_init(&aiocbe->timeout); 1114 SLIST_INIT(&aiocbe->klist); 1115 1116 suword(&job->_aiocb_private.status, -1); 1117 suword(&job->_aiocb_private.error, 0); 1118 suword(&job->_aiocb_private.kernelinfo, -1); 1119 1120 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb)); 1121 if (error) { 1122 suword(&job->_aiocb_private.error, error); 1123 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1124 return error; 1125 } 1126 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL && 1127 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) { 1128 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1129 return EINVAL; 1130 } 1131 1132 /* Save userspace address of the job info. */ 1133 aiocbe->uuaiocb = job; 1134 1135 /* Get the opcode. */ 1136 user_opcode = aiocbe->uaiocb.aio_lio_opcode; 1137 if (type != LIO_NOP) 1138 aiocbe->uaiocb.aio_lio_opcode = type; 1139 opcode = aiocbe->uaiocb.aio_lio_opcode; 1140 1141 /* Get the fd info for process. */ 1142 fdp = p->p_fd; 1143 1144 /* 1145 * Range check file descriptor. 1146 */ 1147 fd = aiocbe->uaiocb.aio_fildes; 1148 if (fd >= fdp->fd_nfiles) { 1149 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1150 if (type == 0) 1151 suword(&job->_aiocb_private.error, EBADF); 1152 return EBADF; 1153 } 1154 1155 fp = aiocbe->fd_file = fdp->fd_files[fd].fp; 1156 if ((fp == NULL) || ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) == 1157 0))) { 1158 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1159 if (type == 0) 1160 suword(&job->_aiocb_private.error, EBADF); 1161 return EBADF; 1162 } 1163 fhold(fp); 1164 1165 if (aiocbe->uaiocb.aio_offset == -1LL) { 1166 error = EINVAL; 1167 goto aqueue_fail; 1168 } 1169 error = suword(&job->_aiocb_private.kernelinfo, jobrefid); 1170 if (error) { 1171 error = EINVAL; 1172 goto aqueue_fail; 1173 } 1174 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid; 1175 if (jobrefid == LONG_MAX) 1176 jobrefid = 1; 1177 else 1178 jobrefid++; 1179 1180 if (opcode == LIO_NOP) { 1181 fdrop(fp); 1182 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1183 if (type == 0) { 1184 suword(&job->_aiocb_private.error, 0); 1185 suword(&job->_aiocb_private.status, 0); 1186 suword(&job->_aiocb_private.kernelinfo, 0); 1187 } 1188 return 0; 1189 } 1190 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) { 1191 if (type == 0) 1192 suword(&job->_aiocb_private.status, 0); 1193 error = EINVAL; 1194 goto aqueue_fail; 1195 } 1196 1197 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) { 1198 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue; 1199 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr; 1200 } 1201 else { 1202 /* 1203 * This method for requesting kevent-based notification won't 1204 * work on the alpha, since we're passing in a pointer 1205 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT- 1206 * based method instead. 1207 */ 1208 if (user_opcode == LIO_NOP || user_opcode == LIO_READ || 1209 user_opcode == LIO_WRITE) 1210 goto no_kqueue; 1211 1212 error = copyin((struct kevent *)(uintptr_t)user_opcode, 1213 &kev, sizeof(kev)); 1214 if (error) 1215 goto aqueue_fail; 1216 } 1217 if ((u_int)kev.ident >= fdp->fd_nfiles || 1218 (kq_fp = fdp->fd_files[kev.ident].fp) == NULL || 1219 (kq_fp->f_type != DTYPE_KQUEUE)) { 1220 error = EBADF; 1221 goto aqueue_fail; 1222 } 1223 kq = (struct kqueue *)kq_fp->f_data; 1224 kev.ident = (uintptr_t)aiocbe->uuaiocb; 1225 kev.filter = EVFILT_AIO; 1226 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 1227 kev.data = (intptr_t)aiocbe; 1228 /* XXX lwp kqueue_register takes a thread, but only uses its proc */ 1229 error = kqueue_register(kq, &kev, FIRST_LWP_IN_PROC(p)->lwp_thread); 1230 aqueue_fail: 1231 if (error) { 1232 fdrop(fp); 1233 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1234 if (type == 0) 1235 suword(&job->_aiocb_private.error, error); 1236 goto done; 1237 } 1238 no_kqueue: 1239 1240 suword(&job->_aiocb_private.error, EINPROGRESS); 1241 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; 1242 aiocbe->userproc = p; 1243 aiocbe->jobflags = 0; 1244 aiocbe->lio = lj; 1245 ki = p->p_aioinfo; 1246 1247 if (fp->f_type == DTYPE_SOCKET) { 1248 /* 1249 * Alternate queueing for socket ops: Reach down into the 1250 * descriptor to get the socket data. Then check to see if the 1251 * socket is ready to be read or written (based on the requested 1252 * operation). 1253 * 1254 * If it is not ready for io, then queue the aiocbe on the 1255 * socket, and set the flags so we get a call when ssb_notify() 1256 * happens. 1257 */ 1258 so = (struct socket *)fp->f_data; 1259 crit_enter(); 1260 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode == 1261 LIO_WRITE) && (!sowriteable(so)))) { 1262 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list); 1263 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist); 1264 if (opcode == LIO_READ) 1265 so->so_rcv.ssb_flags |= SSB_AIO; 1266 else 1267 so->so_snd.ssb_flags |= SSB_AIO; 1268 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */ 1269 ki->kaio_queue_count++; 1270 num_queue_count++; 1271 crit_exit(); 1272 error = 0; 1273 goto done; 1274 } 1275 crit_exit(); 1276 } 1277 1278 if ((error = aio_qphysio(p, aiocbe)) == 0) 1279 goto done; 1280 if (error > 0) { 1281 suword(&job->_aiocb_private.status, 0); 1282 aiocbe->uaiocb._aiocb_private.error = error; 1283 suword(&job->_aiocb_private.error, error); 1284 goto done; 1285 } 1286 1287 /* No buffer for daemon I/O. */ 1288 aiocbe->bp = NULL; 1289 1290 ki->kaio_queue_count++; 1291 if (lj) 1292 lj->lioj_queue_count++; 1293 crit_enter(); 1294 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); 1295 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); 1296 crit_exit(); 1297 aiocbe->jobstate = JOBST_JOBQGLOBAL; 1298 1299 num_queue_count++; 1300 error = 0; 1301 1302 /* 1303 * If we don't have a free AIO process, and we are below our quota, then 1304 * start one. Otherwise, depend on the subsequent I/O completions to 1305 * pick-up this job. If we don't successfully create the new process 1306 * (thread) due to resource issues, we return an error for now (EAGAIN), 1307 * which is likely not the correct thing to do. 1308 */ 1309 crit_enter(); 1310 retryproc: 1311 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1312 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1313 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1314 aiop->aioprocflags &= ~AIOP_FREE; 1315 wakeup(aiop->aioproc); 1316 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && 1317 ((ki->kaio_active_count + num_aio_resv_start) < 1318 ki->kaio_maxactive_count)) { 1319 num_aio_resv_start++; 1320 if ((error = aio_newproc()) == 0) { 1321 num_aio_resv_start--; 1322 goto retryproc; 1323 } 1324 num_aio_resv_start--; 1325 } 1326 crit_exit(); 1327 done: 1328 return error; 1329 } 1330 1331 /* 1332 * This routine queues an AIO request, checking for quotas. 1333 */ 1334 static int 1335 aio_aqueue(struct aiocb *job, int type) 1336 { 1337 struct proc *p = curproc; 1338 struct kaioinfo *ki; 1339 1340 if (p->p_aioinfo == NULL) 1341 aio_init_aioinfo(p); 1342 1343 if (num_queue_count >= max_queue_count) 1344 return EAGAIN; 1345 1346 ki = p->p_aioinfo; 1347 if (ki->kaio_queue_count >= ki->kaio_qallowed_count) 1348 return EAGAIN; 1349 1350 return _aio_aqueue(job, NULL, type); 1351 } 1352 #endif /* VFS_AIO */ 1353 1354 /* 1355 * Support the aio_return system call, as a side-effect, kernel resources are 1356 * released. 1357 */ 1358 int 1359 sys_aio_return(struct aio_return_args *uap) 1360 { 1361 #ifndef VFS_AIO 1362 return ENOSYS; 1363 #else 1364 struct proc *p = curproc; 1365 struct lwp *lp = curthread->td_lwp; 1366 long jobref; 1367 struct aiocblist *cb, *ncb; 1368 struct aiocb *ujob; 1369 struct kaioinfo *ki; 1370 1371 ki = p->p_aioinfo; 1372 if (ki == NULL) 1373 return EINVAL; 1374 1375 ujob = uap->aiocbp; 1376 1377 jobref = fuword(&ujob->_aiocb_private.kernelinfo); 1378 if (jobref == -1 || jobref == 0) 1379 return EINVAL; 1380 1381 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1382 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == 1383 jobref) { 1384 if (ujob == cb->uuaiocb) { 1385 uap->sysmsg_result = 1386 cb->uaiocb._aiocb_private.status; 1387 } else 1388 uap->sysmsg_result = EFAULT; 1389 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 1390 lp->lwp_ru.ru_oublock += cb->outputcharge; 1391 cb->outputcharge = 0; 1392 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 1393 lp->lwp_ru.ru_inblock += cb->inputcharge; 1394 cb->inputcharge = 0; 1395 } 1396 aio_free_entry(cb); 1397 return 0; 1398 } 1399 } 1400 crit_enter(); 1401 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) { 1402 ncb = TAILQ_NEXT(cb, plist); 1403 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) 1404 == jobref) { 1405 crit_exit(); 1406 if (ujob == cb->uuaiocb) { 1407 uap->sysmsg_result = 1408 cb->uaiocb._aiocb_private.status; 1409 } else 1410 uap->sysmsg_result = EFAULT; 1411 aio_free_entry(cb); 1412 return 0; 1413 } 1414 } 1415 crit_exit(); 1416 1417 return (EINVAL); 1418 #endif /* VFS_AIO */ 1419 } 1420 1421 /* 1422 * Allow a process to wakeup when any of the I/O requests are completed. 1423 */ 1424 int 1425 sys_aio_suspend(struct aio_suspend_args *uap) 1426 { 1427 #ifndef VFS_AIO 1428 return ENOSYS; 1429 #else 1430 struct proc *p = curproc; 1431 struct timeval atv; 1432 struct timespec ts; 1433 struct aiocb *const *cbptr, *cbp; 1434 struct kaioinfo *ki; 1435 struct aiocblist *cb; 1436 int i; 1437 int njoblist; 1438 int error, timo; 1439 long *ijoblist; 1440 struct aiocb **ujoblist; 1441 1442 if (uap->nent > AIO_LISTIO_MAX) 1443 return EINVAL; 1444 1445 timo = 0; 1446 if (uap->timeout) { 1447 /* Get timespec struct. */ 1448 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 1449 return error; 1450 1451 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) 1452 return (EINVAL); 1453 1454 TIMESPEC_TO_TIMEVAL(&atv, &ts); 1455 if (itimerfix(&atv)) 1456 return (EINVAL); 1457 timo = tvtohz_high(&atv); 1458 } 1459 1460 ki = p->p_aioinfo; 1461 if (ki == NULL) 1462 return EAGAIN; 1463 1464 njoblist = 0; 1465 ijoblist = zalloc(aiol_zone); 1466 ujoblist = zalloc(aiol_zone); 1467 cbptr = uap->aiocbp; 1468 1469 for (i = 0; i < uap->nent; i++) { 1470 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1471 if (cbp == 0) 1472 continue; 1473 ujoblist[njoblist] = cbp; 1474 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo); 1475 njoblist++; 1476 } 1477 1478 if (njoblist == 0) { 1479 zfree(aiol_zone, ijoblist); 1480 zfree(aiol_zone, ujoblist); 1481 return 0; 1482 } 1483 1484 error = 0; 1485 for (;;) { 1486 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1487 for (i = 0; i < njoblist; i++) { 1488 if (((intptr_t) 1489 cb->uaiocb._aiocb_private.kernelinfo) == 1490 ijoblist[i]) { 1491 if (ujoblist[i] != cb->uuaiocb) 1492 error = EINVAL; 1493 zfree(aiol_zone, ijoblist); 1494 zfree(aiol_zone, ujoblist); 1495 return error; 1496 } 1497 } 1498 } 1499 1500 crit_enter(); 1501 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = 1502 TAILQ_NEXT(cb, plist)) { 1503 for (i = 0; i < njoblist; i++) { 1504 if (((intptr_t) 1505 cb->uaiocb._aiocb_private.kernelinfo) == 1506 ijoblist[i]) { 1507 crit_exit(); 1508 if (ujoblist[i] != cb->uuaiocb) 1509 error = EINVAL; 1510 zfree(aiol_zone, ijoblist); 1511 zfree(aiol_zone, ujoblist); 1512 return error; 1513 } 1514 } 1515 } 1516 1517 ki->kaio_flags |= KAIO_WAKEUP; 1518 error = tsleep(p, PCATCH, "aiospn", timo); 1519 crit_exit(); 1520 1521 if (error == ERESTART || error == EINTR) { 1522 zfree(aiol_zone, ijoblist); 1523 zfree(aiol_zone, ujoblist); 1524 return EINTR; 1525 } else if (error == EWOULDBLOCK) { 1526 zfree(aiol_zone, ijoblist); 1527 zfree(aiol_zone, ujoblist); 1528 return EAGAIN; 1529 } 1530 } 1531 1532 /* NOTREACHED */ 1533 return EINVAL; 1534 #endif /* VFS_AIO */ 1535 } 1536 1537 /* 1538 * aio_cancel cancels any non-physio aio operations not currently in 1539 * progress. 1540 */ 1541 int 1542 sys_aio_cancel(struct aio_cancel_args *uap) 1543 { 1544 #ifndef VFS_AIO 1545 return ENOSYS; 1546 #else 1547 struct proc *p = curproc; 1548 struct kaioinfo *ki; 1549 struct aiocblist *cbe, *cbn; 1550 struct file *fp; 1551 struct filedesc *fdp; 1552 struct socket *so; 1553 struct proc *po; 1554 int error; 1555 int cancelled=0; 1556 int notcancelled=0; 1557 struct vnode *vp; 1558 1559 fdp = p->p_fd; 1560 if ((u_int)uap->fd >= fdp->fd_nfiles || 1561 (fp = fdp->fd_files[uap->fd].fp) == NULL) 1562 return (EBADF); 1563 1564 if (fp->f_type == DTYPE_VNODE) { 1565 vp = (struct vnode *)fp->f_data; 1566 1567 if (vn_isdisk(vp,&error)) { 1568 uap->sysmsg_result = AIO_NOTCANCELED; 1569 return 0; 1570 } 1571 } else if (fp->f_type == DTYPE_SOCKET) { 1572 so = (struct socket *)fp->f_data; 1573 1574 crit_enter(); 1575 1576 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) { 1577 cbn = TAILQ_NEXT(cbe, list); 1578 if ((uap->aiocbp == NULL) || 1579 (uap->aiocbp == cbe->uuaiocb) ) { 1580 po = cbe->userproc; 1581 ki = po->p_aioinfo; 1582 TAILQ_REMOVE(&so->so_aiojobq, cbe, list); 1583 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist); 1584 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist); 1585 if (ki->kaio_flags & KAIO_WAKEUP) { 1586 wakeup(po); 1587 } 1588 cbe->jobstate = JOBST_JOBFINISHED; 1589 cbe->uaiocb._aiocb_private.status=-1; 1590 cbe->uaiocb._aiocb_private.error=ECANCELED; 1591 cancelled++; 1592 /* XXX cancelled, knote? */ 1593 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1594 SIGEV_SIGNAL) 1595 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1596 if (uap->aiocbp) 1597 break; 1598 } 1599 } 1600 crit_exit(); 1601 1602 if ((cancelled) && (uap->aiocbp)) { 1603 uap->sysmsg_result = AIO_CANCELED; 1604 return 0; 1605 } 1606 } 1607 ki=p->p_aioinfo; 1608 if (ki == NULL) 1609 goto done; 1610 crit_enter(); 1611 1612 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) { 1613 cbn = TAILQ_NEXT(cbe, plist); 1614 1615 if ((uap->fd == cbe->uaiocb.aio_fildes) && 1616 ((uap->aiocbp == NULL ) || 1617 (uap->aiocbp == cbe->uuaiocb))) { 1618 1619 if (cbe->jobstate == JOBST_JOBQGLOBAL) { 1620 TAILQ_REMOVE(&aio_jobs, cbe, list); 1621 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); 1622 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, 1623 plist); 1624 cancelled++; 1625 ki->kaio_queue_finished_count++; 1626 cbe->jobstate = JOBST_JOBFINISHED; 1627 cbe->uaiocb._aiocb_private.status = -1; 1628 cbe->uaiocb._aiocb_private.error = ECANCELED; 1629 /* XXX cancelled, knote? */ 1630 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1631 SIGEV_SIGNAL) 1632 ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1633 } else { 1634 notcancelled++; 1635 } 1636 } 1637 } 1638 crit_exit(); 1639 done: 1640 if (notcancelled) { 1641 uap->sysmsg_result = AIO_NOTCANCELED; 1642 return 0; 1643 } 1644 if (cancelled) { 1645 uap->sysmsg_result = AIO_CANCELED; 1646 return 0; 1647 } 1648 uap->sysmsg_result = AIO_ALLDONE; 1649 1650 return 0; 1651 #endif /* VFS_AIO */ 1652 } 1653 1654 /* 1655 * aio_error is implemented in the kernel level for compatibility purposes only. 1656 * For a user mode async implementation, it would be best to do it in a userland 1657 * subroutine. 1658 */ 1659 int 1660 sys_aio_error(struct aio_error_args *uap) 1661 { 1662 #ifndef VFS_AIO 1663 return ENOSYS; 1664 #else 1665 struct proc *p = curproc; 1666 struct aiocblist *cb; 1667 struct kaioinfo *ki; 1668 long jobref; 1669 1670 ki = p->p_aioinfo; 1671 if (ki == NULL) 1672 return EINVAL; 1673 1674 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo); 1675 if ((jobref == -1) || (jobref == 0)) 1676 return EINVAL; 1677 1678 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1679 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1680 jobref) { 1681 uap->sysmsg_result = cb->uaiocb._aiocb_private.error; 1682 return 0; 1683 } 1684 } 1685 1686 crit_enter(); 1687 1688 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb, 1689 plist)) { 1690 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1691 jobref) { 1692 uap->sysmsg_result = EINPROGRESS; 1693 crit_exit(); 1694 return 0; 1695 } 1696 } 1697 1698 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb, 1699 plist)) { 1700 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1701 jobref) { 1702 uap->sysmsg_result = EINPROGRESS; 1703 crit_exit(); 1704 return 0; 1705 } 1706 } 1707 crit_exit(); 1708 1709 crit_enter(); 1710 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, 1711 plist)) { 1712 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1713 jobref) { 1714 uap->sysmsg_result = cb->uaiocb._aiocb_private.error; 1715 crit_exit(); 1716 return 0; 1717 } 1718 } 1719 1720 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb, 1721 plist)) { 1722 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1723 jobref) { 1724 uap->sysmsg_result = EINPROGRESS; 1725 crit_exit(); 1726 return 0; 1727 } 1728 } 1729 crit_exit(); 1730 1731 #if (0) 1732 /* 1733 * Hack for lio. 1734 */ 1735 status = fuword(&uap->aiocbp->_aiocb_private.status); 1736 if (status == -1) 1737 return fuword(&uap->aiocbp->_aiocb_private.error); 1738 #endif 1739 return EINVAL; 1740 #endif /* VFS_AIO */ 1741 } 1742 1743 /* syscall - asynchronous read from a file (REALTIME) */ 1744 int 1745 sys_aio_read(struct aio_read_args *uap) 1746 { 1747 #ifndef VFS_AIO 1748 return ENOSYS; 1749 #else 1750 return aio_aqueue(uap->aiocbp, LIO_READ); 1751 #endif /* VFS_AIO */ 1752 } 1753 1754 /* syscall - asynchronous write to a file (REALTIME) */ 1755 int 1756 sys_aio_write(struct aio_write_args *uap) 1757 { 1758 #ifndef VFS_AIO 1759 return ENOSYS; 1760 #else 1761 return aio_aqueue(uap->aiocbp, LIO_WRITE); 1762 #endif /* VFS_AIO */ 1763 } 1764 1765 /* syscall - XXX undocumented */ 1766 int 1767 sys_lio_listio(struct lio_listio_args *uap) 1768 { 1769 #ifndef VFS_AIO 1770 return ENOSYS; 1771 #else 1772 struct proc *p = curproc; 1773 struct lwp *lp = curthread->td_lwp; 1774 int nent, nentqueued; 1775 struct aiocb *iocb, * const *cbptr; 1776 struct aiocblist *cb; 1777 struct kaioinfo *ki; 1778 struct aio_liojob *lj; 1779 int error, runningcode; 1780 int nerror; 1781 int i; 1782 1783 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 1784 return EINVAL; 1785 1786 nent = uap->nent; 1787 if (nent > AIO_LISTIO_MAX) 1788 return EINVAL; 1789 1790 if (p->p_aioinfo == NULL) 1791 aio_init_aioinfo(p); 1792 1793 if ((nent + num_queue_count) > max_queue_count) 1794 return EAGAIN; 1795 1796 ki = p->p_aioinfo; 1797 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) 1798 return EAGAIN; 1799 1800 lj = zalloc(aiolio_zone); 1801 if (!lj) 1802 return EAGAIN; 1803 1804 lj->lioj_flags = 0; 1805 lj->lioj_buffer_count = 0; 1806 lj->lioj_buffer_finished_count = 0; 1807 lj->lioj_queue_count = 0; 1808 lj->lioj_queue_finished_count = 0; 1809 lj->lioj_ki = ki; 1810 1811 /* 1812 * Setup signal. 1813 */ 1814 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 1815 error = copyin(uap->sig, &lj->lioj_signal, 1816 sizeof(lj->lioj_signal)); 1817 if (error) { 1818 zfree(aiolio_zone, lj); 1819 return error; 1820 } 1821 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 1822 zfree(aiolio_zone, lj); 1823 return EINVAL; 1824 } 1825 lj->lioj_flags |= LIOJ_SIGNAL; 1826 lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED; 1827 } else 1828 lj->lioj_flags &= ~LIOJ_SIGNAL; 1829 1830 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 1831 /* 1832 * Get pointers to the list of I/O requests. 1833 */ 1834 nerror = 0; 1835 nentqueued = 0; 1836 cbptr = uap->acb_list; 1837 for (i = 0; i < uap->nent; i++) { 1838 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1839 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) { 1840 error = _aio_aqueue(iocb, lj, 0); 1841 if (error == 0) 1842 nentqueued++; 1843 else 1844 nerror++; 1845 } 1846 } 1847 1848 /* 1849 * If we haven't queued any, then just return error. 1850 */ 1851 if (nentqueued == 0) 1852 return 0; 1853 1854 /* 1855 * Calculate the appropriate error return. 1856 */ 1857 runningcode = 0; 1858 if (nerror) 1859 runningcode = EIO; 1860 1861 if (uap->mode == LIO_WAIT) { 1862 int command, found, jobref; 1863 1864 for (;;) { 1865 found = 0; 1866 for (i = 0; i < uap->nent; i++) { 1867 /* 1868 * Fetch address of the control buf pointer in 1869 * user space. 1870 */ 1871 iocb = (struct aiocb *) 1872 (intptr_t)fuword(&cbptr[i]); 1873 if (((intptr_t)iocb == -1) || ((intptr_t)iocb 1874 == 0)) 1875 continue; 1876 1877 /* 1878 * Fetch the associated command from user space. 1879 */ 1880 command = fuword(&iocb->aio_lio_opcode); 1881 if (command == LIO_NOP) { 1882 found++; 1883 continue; 1884 } 1885 1886 jobref = fuword(&iocb->_aiocb_private.kernelinfo); 1887 1888 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1889 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 1890 == jobref) { 1891 if (cb->uaiocb.aio_lio_opcode 1892 == LIO_WRITE) { 1893 lp->lwp_ru.ru_oublock += 1894 cb->outputcharge; 1895 cb->outputcharge = 0; 1896 } else if (cb->uaiocb.aio_lio_opcode 1897 == LIO_READ) { 1898 lp->lwp_ru.ru_inblock += 1899 cb->inputcharge; 1900 cb->inputcharge = 0; 1901 } 1902 found++; 1903 break; 1904 } 1905 } 1906 1907 crit_enter(); 1908 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) { 1909 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 1910 == jobref) { 1911 found++; 1912 break; 1913 } 1914 } 1915 crit_exit(); 1916 } 1917 1918 /* 1919 * If all I/Os have been disposed of, then we can 1920 * return. 1921 */ 1922 if (found == nentqueued) 1923 return runningcode; 1924 1925 ki->kaio_flags |= KAIO_WAKEUP; 1926 error = tsleep(p, PCATCH, "aiospn", 0); 1927 1928 if (error == EINTR) 1929 return EINTR; 1930 else if (error == EWOULDBLOCK) 1931 return EAGAIN; 1932 } 1933 } 1934 1935 return runningcode; 1936 #endif /* VFS_AIO */ 1937 } 1938 1939 #ifdef VFS_AIO 1940 /* 1941 * This is a weird hack so that we can post a signal. It is safe to do so from 1942 * a timeout routine, but *not* from an interrupt routine. 1943 */ 1944 static void 1945 process_signal(void *aioj) 1946 { 1947 struct aiocblist *aiocbe = aioj; 1948 struct aio_liojob *lj = aiocbe->lio; 1949 struct aiocb *cb = &aiocbe->uaiocb; 1950 1951 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) && 1952 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) { 1953 ksignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo); 1954 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 1955 } 1956 1957 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) 1958 ksignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo); 1959 } 1960 1961 /* 1962 * Interrupt handler for physio, performs the necessary process wakeups, and 1963 * signals. 1964 */ 1965 static void 1966 aio_physwakeup(struct bio *bio) 1967 { 1968 struct buf *bp = bio->bio_buf; 1969 struct aiocblist *aiocbe; 1970 struct proc *p; 1971 struct kaioinfo *ki; 1972 struct aio_liojob *lj; 1973 1974 aiocbe = bio->bio_caller_info2.ptr; 1975 1976 if (aiocbe) { 1977 p = bio->bio_caller_info1.ptr; 1978 1979 aiocbe->jobstate = JOBST_JOBBFINISHED; 1980 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; 1981 aiocbe->uaiocb._aiocb_private.error = 0; 1982 aiocbe->jobflags |= AIOCBLIST_DONE; 1983 1984 if (bp->b_flags & B_ERROR) 1985 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 1986 1987 lj = aiocbe->lio; 1988 if (lj) { 1989 lj->lioj_buffer_finished_count++; 1990 1991 /* 1992 * wakeup/signal if all of the interrupt jobs are done. 1993 */ 1994 if (lj->lioj_buffer_finished_count == 1995 lj->lioj_buffer_count) { 1996 /* 1997 * Post a signal if it is called for. 1998 */ 1999 if ((lj->lioj_flags & 2000 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == 2001 LIOJ_SIGNAL) { 2002 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2003 callout_reset(&aiocbe->timeout, 0, 2004 process_signal, aiocbe); 2005 } 2006 } 2007 } 2008 2009 ki = p->p_aioinfo; 2010 if (ki) { 2011 ki->kaio_buffer_finished_count++; 2012 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 2013 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 2014 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 2015 2016 KNOTE(&aiocbe->klist, 0); 2017 /* Do the wakeup. */ 2018 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) { 2019 ki->kaio_flags &= ~KAIO_WAKEUP; 2020 wakeup(p); 2021 } 2022 } 2023 2024 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 2025 callout_reset(&aiocbe->timeout, 0, 2026 process_signal, aiocbe); 2027 } 2028 } 2029 bp->b_cmd = BUF_CMD_DONE; 2030 wakeup(bp); 2031 } 2032 #endif /* VFS_AIO */ 2033 2034 /* syscall - wait for the next completion of an aio request */ 2035 int 2036 sys_aio_waitcomplete(struct aio_waitcomplete_args *uap) 2037 { 2038 #ifndef VFS_AIO 2039 return ENOSYS; 2040 #else 2041 struct proc *p = curproc; 2042 struct lwp *lp = curthread->td_lwp; 2043 struct timeval atv; 2044 struct timespec ts; 2045 struct kaioinfo *ki; 2046 struct aiocblist *cb = NULL; 2047 int error, timo; 2048 2049 suword(uap->aiocbp, (int)NULL); 2050 2051 timo = 0; 2052 if (uap->timeout) { 2053 /* Get timespec struct. */ 2054 error = copyin(uap->timeout, &ts, sizeof(ts)); 2055 if (error) 2056 return error; 2057 2058 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000)) 2059 return (EINVAL); 2060 2061 TIMESPEC_TO_TIMEVAL(&atv, &ts); 2062 if (itimerfix(&atv)) 2063 return (EINVAL); 2064 timo = tvtohz_high(&atv); 2065 } 2066 2067 ki = p->p_aioinfo; 2068 if (ki == NULL) 2069 return EAGAIN; 2070 2071 for (;;) { 2072 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) { 2073 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2074 uap->sysmsg_result = cb->uaiocb._aiocb_private.status; 2075 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 2076 lp->lwp_ru.ru_oublock += 2077 cb->outputcharge; 2078 cb->outputcharge = 0; 2079 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 2080 lp->lwp_ru.ru_inblock += cb->inputcharge; 2081 cb->inputcharge = 0; 2082 } 2083 aio_free_entry(cb); 2084 return cb->uaiocb._aiocb_private.error; 2085 } 2086 2087 crit_enter(); 2088 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) { 2089 crit_exit(); 2090 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2091 uap->sysmsg_result = cb->uaiocb._aiocb_private.status; 2092 aio_free_entry(cb); 2093 return cb->uaiocb._aiocb_private.error; 2094 } 2095 2096 ki->kaio_flags |= KAIO_WAKEUP; 2097 error = tsleep(p, PCATCH, "aiowc", timo); 2098 crit_exit(); 2099 2100 if (error == ERESTART) 2101 return EINTR; 2102 else if (error < 0) 2103 return error; 2104 else if (error == EINTR) 2105 return EINTR; 2106 else if (error == EWOULDBLOCK) 2107 return EAGAIN; 2108 } 2109 #endif /* VFS_AIO */ 2110 } 2111 2112 #ifndef VFS_AIO 2113 static int 2114 filt_aioattach(struct knote *kn) 2115 { 2116 2117 return (ENXIO); 2118 } 2119 2120 struct filterops aio_filtops = 2121 { 0, filt_aioattach, NULL, NULL }; 2122 2123 #else 2124 /* kqueue attach function */ 2125 static int 2126 filt_aioattach(struct knote *kn) 2127 { 2128 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2129 2130 /* 2131 * The aiocbe pointer must be validated before using it, so 2132 * registration is restricted to the kernel; the user cannot 2133 * set EV_FLAG1. 2134 */ 2135 if ((kn->kn_flags & EV_FLAG1) == 0) 2136 return (EPERM); 2137 kn->kn_flags &= ~EV_FLAG1; 2138 2139 SLIST_INSERT_HEAD(&aiocbe->klist, kn, kn_selnext); 2140 2141 return (0); 2142 } 2143 2144 /* kqueue detach function */ 2145 static void 2146 filt_aiodetach(struct knote *kn) 2147 { 2148 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2149 2150 SLIST_REMOVE(&aiocbe->klist, kn, knote, kn_selnext); 2151 } 2152 2153 /* kqueue filter function */ 2154 /*ARGSUSED*/ 2155 static int 2156 filt_aio(struct knote *kn, long hint) 2157 { 2158 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2159 2160 kn->kn_data = aiocbe->uaiocb._aiocb_private.error; 2161 if (aiocbe->jobstate != JOBST_JOBFINISHED && 2162 aiocbe->jobstate != JOBST_JOBBFINISHED) 2163 return (0); 2164 kn->kn_flags |= EV_EOF; 2165 return (1); 2166 } 2167 2168 struct filterops aio_filtops = 2169 { 0, filt_aioattach, filt_aiodetach, filt_aio }; 2170 #endif /* VFS_AIO */ 2171