Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_aio.c
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1 /* 2 * Copyright (c) 1997 John S. Dyson. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. John S. Dyson's name may not be used to endorse or promote products 10 * derived from this software without specific prior written permission. 11 * 12 * DISCLAIMER: This code isn't warranted to do anything useful. Anything 13 * bad that happens because of using this software isn't the responsibility 14 * of the author. This software is distributed AS-IS. 15 * 16 * $FreeBSD$ 17 */ 18 19 /* 20 * This file contains support for the POSIX 1003.1B AIO/LIO facility. 21 */ 22 23 #include <sys/param.h> 24 #include <sys/systm.h> 25 #include <sys/buf.h> 26 #include <sys/sysproto.h> 27 #include <sys/filedesc.h> 28 #include <sys/kernel.h> 29 #include <sys/fcntl.h> 30 #include <sys/file.h> 31 #include <sys/lock.h> 32 #include <sys/unistd.h> 33 #include <sys/proc.h> 34 #include <sys/resourcevar.h> 35 #include <sys/signalvar.h> 36 #include <sys/protosw.h> 37 #include <sys/socketvar.h> 38 #include <sys/sysctl.h> 39 #include <sys/vnode.h> 40 #include <sys/conf.h> 41 #include <sys/event.h> 42 43 #include <vm/vm.h> 44 #include <vm/vm_extern.h> 45 #include <vm/pmap.h> 46 #include <vm/vm_map.h> 47 #include <vm/vm_zone.h> 48 #include <sys/aio.h> 49 50 #include <machine/limits.h> 51 #include "opt_vfs_aio.h" 52 53 #ifdef VFS_AIO 54 55 /* 56 * Counter for allocating reference ids to new jobs. Wrapped to 1 on 57 * overflow. 58 */ 59 static long jobrefid; 60 61 #define JOBST_NULL 0x0 62 #define JOBST_JOBQGLOBAL 0x2 63 #define JOBST_JOBRUNNING 0x3 64 #define JOBST_JOBFINISHED 0x4 65 #define JOBST_JOBQBUF 0x5 66 #define JOBST_JOBBFINISHED 0x6 67 68 #ifndef MAX_AIO_PER_PROC 69 #define MAX_AIO_PER_PROC 32 70 #endif 71 72 #ifndef MAX_AIO_QUEUE_PER_PROC 73 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */ 74 #endif 75 76 #ifndef MAX_AIO_PROCS 77 #define MAX_AIO_PROCS 32 78 #endif 79 80 #ifndef MAX_AIO_QUEUE 81 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */ 82 #endif 83 84 #ifndef TARGET_AIO_PROCS 85 #define TARGET_AIO_PROCS 4 86 #endif 87 88 #ifndef MAX_BUF_AIO 89 #define MAX_BUF_AIO 16 90 #endif 91 92 #ifndef AIOD_TIMEOUT_DEFAULT 93 #define AIOD_TIMEOUT_DEFAULT (10 * hz) 94 #endif 95 96 #ifndef AIOD_LIFETIME_DEFAULT 97 #define AIOD_LIFETIME_DEFAULT (30 * hz) 98 #endif 99 100 SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management"); 101 102 static int max_aio_procs = MAX_AIO_PROCS; 103 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, 104 CTLFLAG_RW, &max_aio_procs, 0, 105 "Maximum number of kernel threads to use for handling async IO"); 106 107 static int num_aio_procs = 0; 108 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, 109 CTLFLAG_RD, &num_aio_procs, 0, 110 "Number of presently active kernel threads for async IO"); 111 112 /* 113 * The code will adjust the actual number of AIO processes towards this 114 * number when it gets a chance. 115 */ 116 static int target_aio_procs = TARGET_AIO_PROCS; 117 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 118 0, "Preferred number of ready kernel threads for async IO"); 119 120 static int max_queue_count = MAX_AIO_QUEUE; 121 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, 122 "Maximum number of aio requests to queue, globally"); 123 124 static int num_queue_count = 0; 125 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, 126 "Number of queued aio requests"); 127 128 static int num_buf_aio = 0; 129 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, 130 "Number of aio requests presently handled by the buf subsystem"); 131 132 /* Number of async I/O thread in the process of being started */ 133 /* XXX This should be local to _aio_aqueue() */ 134 static int num_aio_resv_start = 0; 135 136 static int aiod_timeout; 137 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0, 138 "Timeout value for synchronous aio operations"); 139 140 static int aiod_lifetime; 141 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, 142 "Maximum lifetime for idle aiod"); 143 144 static int max_aio_per_proc = MAX_AIO_PER_PROC; 145 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 146 0, "Maximum active aio requests per process (stored in the process)"); 147 148 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 149 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, 150 &max_aio_queue_per_proc, 0, 151 "Maximum queued aio requests per process (stored in the process)"); 152 153 static int max_buf_aio = MAX_BUF_AIO; 154 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, 155 "Maximum buf aio requests per process (stored in the process)"); 156 157 /* 158 * AIO process info 159 */ 160 #define AIOP_FREE 0x1 /* proc on free queue */ 161 #define AIOP_SCHED 0x2 /* proc explicitly scheduled */ 162 163 struct aioproclist { 164 int aioprocflags; /* AIO proc flags */ 165 TAILQ_ENTRY(aioproclist) list; /* List of processes */ 166 struct proc *aioproc; /* The AIO thread */ 167 }; 168 169 /* 170 * data-structure for lio signal management 171 */ 172 struct aio_liojob { 173 int lioj_flags; 174 int lioj_buffer_count; 175 int lioj_buffer_finished_count; 176 int lioj_queue_count; 177 int lioj_queue_finished_count; 178 struct sigevent lioj_signal; /* signal on all I/O done */ 179 TAILQ_ENTRY(aio_liojob) lioj_list; 180 struct kaioinfo *lioj_ki; 181 }; 182 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ 183 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ 184 185 /* 186 * per process aio data structure 187 */ 188 struct kaioinfo { 189 int kaio_flags; /* per process kaio flags */ 190 int kaio_maxactive_count; /* maximum number of AIOs */ 191 int kaio_active_count; /* number of currently used AIOs */ 192 int kaio_qallowed_count; /* maxiumu size of AIO queue */ 193 int kaio_queue_count; /* size of AIO queue */ 194 int kaio_ballowed_count; /* maximum number of buffers */ 195 int kaio_queue_finished_count; /* number of daemon jobs finished */ 196 int kaio_buffer_count; /* number of physio buffers */ 197 int kaio_buffer_finished_count; /* count of I/O done */ 198 struct proc *kaio_p; /* process that uses this kaio block */ 199 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */ 200 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */ 201 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */ 202 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */ 203 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */ 204 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */ 205 }; 206 207 #define KAIO_RUNDOWN 0x1 /* process is being run down */ 208 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ 209 210 static TAILQ_HEAD(,aioproclist) aio_freeproc, aio_activeproc; 211 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */ 212 static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */ 213 static TAILQ_HEAD(,aiocblist) aio_freejobs; /* Pool of free jobs */ 214 215 static void aio_init_aioinfo(struct proc *p); 216 static void aio_onceonly(void *); 217 static int aio_free_entry(struct aiocblist *aiocbe); 218 static void aio_process(struct aiocblist *aiocbe); 219 static int aio_newproc(void); 220 static int aio_aqueue(struct proc *p, struct aiocb *job, int type); 221 static void aio_physwakeup(struct buf *bp); 222 static int aio_fphysio(struct aiocblist *aiocbe); 223 static int aio_qphysio(struct proc *p, struct aiocblist *iocb); 224 static void aio_daemon(void *uproc); 225 static void process_signal(void *aioj); 226 227 SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL); 228 229 /* 230 * Zones for: 231 * kaio Per process async io info 232 * aiop async io thread data 233 * aiocb async io jobs 234 * aiol list io job pointer - internal to aio_suspend XXX 235 * aiolio list io jobs 236 */ 237 static vm_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone; 238 239 /* 240 * Startup initialization 241 */ 242 static void 243 aio_onceonly(void *na) 244 { 245 TAILQ_INIT(&aio_freeproc); 246 TAILQ_INIT(&aio_activeproc); 247 TAILQ_INIT(&aio_jobs); 248 TAILQ_INIT(&aio_bufjobs); 249 TAILQ_INIT(&aio_freejobs); 250 kaio_zone = zinit("AIO", sizeof(struct kaioinfo), 0, 0, 1); 251 aiop_zone = zinit("AIOP", sizeof(struct aioproclist), 0, 0, 1); 252 aiocb_zone = zinit("AIOCB", sizeof(struct aiocblist), 0, 0, 1); 253 aiol_zone = zinit("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t), 0, 0, 1); 254 aiolio_zone = zinit("AIOLIO", sizeof(struct aio_liojob), 0, 0, 1); 255 aiod_timeout = AIOD_TIMEOUT_DEFAULT; 256 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 257 jobrefid = 1; 258 } 259 260 /* 261 * Init the per-process aioinfo structure. The aioinfo limits are set 262 * per-process for user limit (resource) management. 263 */ 264 static void 265 aio_init_aioinfo(struct proc *p) 266 { 267 struct kaioinfo *ki; 268 if (p->p_aioinfo == NULL) { 269 ki = zalloc(kaio_zone); 270 p->p_aioinfo = ki; 271 ki->kaio_flags = 0; 272 ki->kaio_maxactive_count = max_aio_per_proc; 273 ki->kaio_active_count = 0; 274 ki->kaio_qallowed_count = max_aio_queue_per_proc; 275 ki->kaio_queue_count = 0; 276 ki->kaio_ballowed_count = max_buf_aio; 277 ki->kaio_buffer_count = 0; 278 ki->kaio_buffer_finished_count = 0; 279 ki->kaio_p = p; 280 TAILQ_INIT(&ki->kaio_jobdone); 281 TAILQ_INIT(&ki->kaio_jobqueue); 282 TAILQ_INIT(&ki->kaio_bufdone); 283 TAILQ_INIT(&ki->kaio_bufqueue); 284 TAILQ_INIT(&ki->kaio_liojoblist); 285 TAILQ_INIT(&ki->kaio_sockqueue); 286 } 287 288 while (num_aio_procs < target_aio_procs) 289 aio_newproc(); 290 } 291 292 /* 293 * Free a job entry. Wait for completion if it is currently active, but don't 294 * delay forever. If we delay, we return a flag that says that we have to 295 * restart the queue scan. 296 */ 297 static int 298 aio_free_entry(struct aiocblist *aiocbe) 299 { 300 struct kaioinfo *ki; 301 struct aio_liojob *lj; 302 struct proc *p; 303 int error; 304 int s; 305 306 if (aiocbe->jobstate == JOBST_NULL) 307 panic("aio_free_entry: freeing already free job"); 308 309 p = aiocbe->userproc; 310 ki = p->p_aioinfo; 311 lj = aiocbe->lio; 312 if (ki == NULL) 313 panic("aio_free_entry: missing p->p_aioinfo"); 314 315 while (aiocbe->jobstate == JOBST_JOBRUNNING) { 316 aiocbe->jobflags |= AIOCBLIST_RUNDOWN; 317 tsleep(aiocbe, PRIBIO, "jobwai", 0); 318 } 319 if (aiocbe->bp == NULL) { 320 if (ki->kaio_queue_count <= 0) 321 panic("aio_free_entry: process queue size <= 0"); 322 if (num_queue_count <= 0) 323 panic("aio_free_entry: system wide queue size <= 0"); 324 325 if (lj) { 326 lj->lioj_queue_count--; 327 if (aiocbe->jobflags & AIOCBLIST_DONE) 328 lj->lioj_queue_finished_count--; 329 } 330 ki->kaio_queue_count--; 331 if (aiocbe->jobflags & AIOCBLIST_DONE) 332 ki->kaio_queue_finished_count--; 333 num_queue_count--; 334 } else { 335 if (lj) { 336 lj->lioj_buffer_count--; 337 if (aiocbe->jobflags & AIOCBLIST_DONE) 338 lj->lioj_buffer_finished_count--; 339 } 340 if (aiocbe->jobflags & AIOCBLIST_DONE) 341 ki->kaio_buffer_finished_count--; 342 ki->kaio_buffer_count--; 343 num_buf_aio--; 344 } 345 346 /* aiocbe is going away, we need to destroy any knotes */ 347 knote_remove(p, &aiocbe->klist); 348 349 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN) 350 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) { 351 ki->kaio_flags &= ~KAIO_WAKEUP; 352 wakeup(p); 353 } 354 355 if (aiocbe->jobstate == JOBST_JOBQBUF) { 356 if ((error = aio_fphysio(aiocbe)) != 0) 357 return error; 358 if (aiocbe->jobstate != JOBST_JOBBFINISHED) 359 panic("aio_free_entry: invalid physio finish-up state"); 360 s = splbio(); 361 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 362 splx(s); 363 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) { 364 s = splnet(); 365 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 366 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 367 splx(s); 368 } else if (aiocbe->jobstate == JOBST_JOBFINISHED) 369 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist); 370 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) { 371 s = splbio(); 372 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 373 splx(s); 374 if (aiocbe->bp) { 375 vunmapbuf(aiocbe->bp); 376 relpbuf(aiocbe->bp, NULL); 377 aiocbe->bp = NULL; 378 } 379 } 380 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) { 381 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 382 zfree(aiolio_zone, lj); 383 } 384 aiocbe->jobstate = JOBST_NULL; 385 untimeout(process_signal, aiocbe, aiocbe->timeouthandle); 386 fdrop(aiocbe->fd_file, curproc); 387 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 388 return 0; 389 } 390 #endif /* VFS_AIO */ 391 392 /* 393 * Rundown the jobs for a given process. 394 */ 395 void 396 aio_proc_rundown(struct proc *p) 397 { 398 #ifndef VFS_AIO 399 return; 400 #else 401 int s; 402 struct kaioinfo *ki; 403 struct aio_liojob *lj, *ljn; 404 struct aiocblist *aiocbe, *aiocbn; 405 struct file *fp; 406 struct socket *so; 407 408 ki = p->p_aioinfo; 409 if (ki == NULL) 410 return; 411 412 ki->kaio_flags |= LIOJ_SIGNAL_POSTED; 413 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count > 414 ki->kaio_buffer_finished_count)) { 415 ki->kaio_flags |= KAIO_RUNDOWN; 416 if (tsleep(p, PRIBIO, "kaiowt", aiod_timeout)) 417 break; 418 } 419 420 /* 421 * Move any aio ops that are waiting on socket I/O to the normal job 422 * queues so they are cleaned up with any others. 423 */ 424 s = splnet(); 425 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe = 426 aiocbn) { 427 aiocbn = TAILQ_NEXT(aiocbe, plist); 428 fp = aiocbe->fd_file; 429 if (fp != NULL) { 430 so = (struct socket *)fp->f_data; 431 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list); 432 if (TAILQ_EMPTY(&so->so_aiojobq)) { 433 so->so_snd.sb_flags &= ~SB_AIO; 434 so->so_rcv.sb_flags &= ~SB_AIO; 435 } 436 } 437 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist); 438 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list); 439 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist); 440 } 441 splx(s); 442 443 restart1: 444 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) { 445 aiocbn = TAILQ_NEXT(aiocbe, plist); 446 if (aio_free_entry(aiocbe)) 447 goto restart1; 448 } 449 450 restart2: 451 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe = 452 aiocbn) { 453 aiocbn = TAILQ_NEXT(aiocbe, plist); 454 if (aio_free_entry(aiocbe)) 455 goto restart2; 456 } 457 458 /* 459 * Note the use of lots of splbio here, trying to avoid splbio for long chains 460 * of I/O. Probably unnecessary. 461 */ 462 restart3: 463 s = splbio(); 464 while (TAILQ_FIRST(&ki->kaio_bufqueue)) { 465 ki->kaio_flags |= KAIO_WAKEUP; 466 tsleep(p, PRIBIO, "aioprn", 0); 467 splx(s); 468 goto restart3; 469 } 470 splx(s); 471 472 restart4: 473 s = splbio(); 474 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) { 475 aiocbn = TAILQ_NEXT(aiocbe, plist); 476 if (aio_free_entry(aiocbe)) { 477 splx(s); 478 goto restart4; 479 } 480 } 481 splx(s); 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 printf("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 int s; 523 struct aiocblist *aiocbe; 524 struct kaioinfo *ki; 525 struct proc *userp; 526 527 s = splnet(); 528 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe = 529 TAILQ_NEXT(aiocbe, list)) { 530 userp = aiocbe->userproc; 531 ki = userp->p_aioinfo; 532 533 if (ki->kaio_active_count < ki->kaio_maxactive_count) { 534 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 535 splx(s); 536 return aiocbe; 537 } 538 } 539 splx(s); 540 541 return NULL; 542 } 543 544 /* 545 * The AIO processing activity. This is the code that does the I/O request for 546 * the non-physio version of the operations. The normal vn operations are used, 547 * and this code should work in all instances for every type of file, including 548 * pipes, sockets, fifos, and regular files. 549 */ 550 static void 551 aio_process(struct aiocblist *aiocbe) 552 { 553 struct proc *mycp; 554 struct aiocb *cb; 555 struct file *fp; 556 struct uio auio; 557 struct iovec aiov; 558 int cnt; 559 int error; 560 int oublock_st, oublock_end; 561 int inblock_st, inblock_end; 562 563 mycp = curproc; 564 cb = &aiocbe->uaiocb; 565 fp = aiocbe->fd_file; 566 567 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; 568 aiov.iov_len = cb->aio_nbytes; 569 570 auio.uio_iov = &aiov; 571 auio.uio_iovcnt = 1; 572 auio.uio_offset = cb->aio_offset; 573 auio.uio_resid = cb->aio_nbytes; 574 cnt = cb->aio_nbytes; 575 auio.uio_segflg = UIO_USERSPACE; 576 auio.uio_procp = mycp; 577 578 inblock_st = mycp->p_stats->p_ru.ru_inblock; 579 oublock_st = mycp->p_stats->p_ru.ru_oublock; 580 /* 581 * _aio_aqueue() acquires a reference to the file that is 582 * released in aio_free_entry(). 583 */ 584 if (cb->aio_lio_opcode == LIO_READ) { 585 auio.uio_rw = UIO_READ; 586 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, mycp); 587 } else { 588 auio.uio_rw = UIO_WRITE; 589 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, mycp); 590 } 591 inblock_end = mycp->p_stats->p_ru.ru_inblock; 592 oublock_end = mycp->p_stats->p_ru.ru_oublock; 593 594 aiocbe->inputcharge = inblock_end - inblock_st; 595 aiocbe->outputcharge = oublock_end - oublock_st; 596 597 if ((error) && (auio.uio_resid != cnt)) { 598 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 599 error = 0; 600 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) 601 psignal(aiocbe->userproc, SIGPIPE); 602 } 603 604 cnt -= auio.uio_resid; 605 cb->_aiocb_private.error = error; 606 cb->_aiocb_private.status = cnt; 607 } 608 609 /* 610 * The AIO daemon, most of the actual work is done in aio_process, 611 * but the setup (and address space mgmt) is done in this routine. 612 */ 613 static void 614 aio_daemon(void *uproc) 615 { 616 int s; 617 struct aio_liojob *lj; 618 struct aiocb *cb; 619 struct aiocblist *aiocbe; 620 struct aioproclist *aiop; 621 struct kaioinfo *ki; 622 struct proc *curcp, *mycp, *userp; 623 struct vmspace *myvm, *tmpvm; 624 625 /* 626 * Local copies of curproc (cp) and vmspace (myvm) 627 */ 628 mycp = curproc; 629 myvm = mycp->p_vmspace; 630 631 if (mycp->p_textvp) { 632 vrele(mycp->p_textvp); 633 mycp->p_textvp = NULL; 634 } 635 636 /* 637 * Allocate and ready the aio control info. There is one aiop structure 638 * per daemon. 639 */ 640 aiop = zalloc(aiop_zone); 641 aiop->aioproc = mycp; 642 aiop->aioprocflags |= AIOP_FREE; 643 644 s = splnet(); 645 646 /* 647 * Place thread (lightweight process) onto the AIO free thread list. 648 */ 649 if (TAILQ_EMPTY(&aio_freeproc)) 650 wakeup(&aio_freeproc); 651 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 652 653 splx(s); 654 655 /* Make up a name for the daemon. */ 656 strcpy(mycp->p_comm, "aiod"); 657 658 /* 659 * Get rid of our current filedescriptors. AIOD's don't need any 660 * filedescriptors, except as temporarily inherited from the client. 661 * Credentials are also cloned, and made equivalent to "root". 662 */ 663 fdfree(mycp); 664 mycp->p_fd = NULL; 665 mycp->p_ucred = crcopy(mycp->p_ucred); 666 mycp->p_ucred->cr_uid = 0; 667 uifree(mycp->p_ucred->cr_uidinfo); 668 mycp->p_ucred->cr_uidinfo = uifind(0); 669 mycp->p_ucred->cr_ngroups = 1; 670 mycp->p_ucred->cr_groups[0] = 1; 671 672 /* The daemon resides in its own pgrp. */ 673 enterpgrp(mycp, mycp->p_pid, 1); 674 675 /* Mark special process type. */ 676 mycp->p_flag |= P_SYSTEM | P_KTHREADP; 677 678 /* 679 * Wakeup parent process. (Parent sleeps to keep from blasting away 680 * and creating too many daemons.) 681 */ 682 wakeup(mycp); 683 684 for (;;) { 685 /* 686 * curcp is the current daemon process context. 687 * userp is the current user process context. 688 */ 689 curcp = mycp; 690 691 /* 692 * Take daemon off of free queue 693 */ 694 if (aiop->aioprocflags & AIOP_FREE) { 695 s = splnet(); 696 TAILQ_REMOVE(&aio_freeproc, aiop, list); 697 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 698 aiop->aioprocflags &= ~AIOP_FREE; 699 splx(s); 700 } 701 aiop->aioprocflags &= ~AIOP_SCHED; 702 703 /* 704 * Check for jobs. 705 */ 706 while ((aiocbe = aio_selectjob(aiop)) != NULL) { 707 cb = &aiocbe->uaiocb; 708 userp = aiocbe->userproc; 709 710 aiocbe->jobstate = JOBST_JOBRUNNING; 711 712 /* 713 * Connect to process address space for user program. 714 */ 715 if (userp != curcp) { 716 /* 717 * Save the current address space that we are 718 * connected to. 719 */ 720 tmpvm = mycp->p_vmspace; 721 722 /* 723 * Point to the new user address space, and 724 * refer to it. 725 */ 726 mycp->p_vmspace = userp->p_vmspace; 727 mycp->p_vmspace->vm_refcnt++; 728 729 /* Activate the new mapping. */ 730 pmap_activate(mycp); 731 732 /* 733 * If the old address space wasn't the daemons 734 * own address space, then we need to remove the 735 * daemon's reference from the other process 736 * that it was acting on behalf of. 737 */ 738 if (tmpvm != myvm) { 739 vmspace_free(tmpvm); 740 } 741 curcp = userp; 742 } 743 744 ki = userp->p_aioinfo; 745 lj = aiocbe->lio; 746 747 /* Account for currently active jobs. */ 748 ki->kaio_active_count++; 749 750 /* Do the I/O function. */ 751 aio_process(aiocbe); 752 753 /* Decrement the active job count. */ 754 ki->kaio_active_count--; 755 756 /* 757 * Increment the completion count for wakeup/signal 758 * comparisons. 759 */ 760 aiocbe->jobflags |= AIOCBLIST_DONE; 761 ki->kaio_queue_finished_count++; 762 if (lj) 763 lj->lioj_queue_finished_count++; 764 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags 765 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) { 766 ki->kaio_flags &= ~KAIO_WAKEUP; 767 wakeup(userp); 768 } 769 770 s = splbio(); 771 if (lj && (lj->lioj_flags & 772 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) { 773 if ((lj->lioj_queue_finished_count == 774 lj->lioj_queue_count) && 775 (lj->lioj_buffer_finished_count == 776 lj->lioj_buffer_count)) { 777 psignal(userp, 778 lj->lioj_signal.sigev_signo); 779 lj->lioj_flags |= 780 LIOJ_SIGNAL_POSTED; 781 } 782 } 783 splx(s); 784 785 aiocbe->jobstate = JOBST_JOBFINISHED; 786 787 s = splnet(); 788 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 789 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist); 790 splx(s); 791 KNOTE(&aiocbe->klist, 0); 792 793 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) { 794 wakeup(aiocbe); 795 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN; 796 } 797 798 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 799 psignal(userp, cb->aio_sigevent.sigev_signo); 800 } 801 } 802 803 /* 804 * Disconnect from user address space. 805 */ 806 if (curcp != mycp) { 807 /* Get the user address space to disconnect from. */ 808 tmpvm = mycp->p_vmspace; 809 810 /* Get original address space for daemon. */ 811 mycp->p_vmspace = myvm; 812 813 /* Activate the daemon's address space. */ 814 pmap_activate(mycp); 815 #ifdef DIAGNOSTIC 816 if (tmpvm == myvm) { 817 printf("AIOD: vmspace problem -- %d\n", 818 mycp->p_pid); 819 } 820 #endif 821 /* Remove our vmspace reference. */ 822 vmspace_free(tmpvm); 823 824 curcp = mycp; 825 } 826 827 /* 828 * If we are the first to be put onto the free queue, wakeup 829 * anyone waiting for a daemon. 830 */ 831 s = splnet(); 832 TAILQ_REMOVE(&aio_activeproc, aiop, list); 833 if (TAILQ_EMPTY(&aio_freeproc)) 834 wakeup(&aio_freeproc); 835 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 836 aiop->aioprocflags |= AIOP_FREE; 837 splx(s); 838 839 /* 840 * If daemon is inactive for a long time, allow it to exit, 841 * thereby freeing resources. 842 */ 843 if (((aiop->aioprocflags & AIOP_SCHED) == 0) && tsleep(mycp, 844 PRIBIO, "aiordy", aiod_lifetime)) { 845 s = splnet(); 846 if (TAILQ_EMPTY(&aio_jobs)) { 847 if ((aiop->aioprocflags & AIOP_FREE) && 848 (num_aio_procs > target_aio_procs)) { 849 TAILQ_REMOVE(&aio_freeproc, aiop, list); 850 splx(s); 851 zfree(aiop_zone, aiop); 852 num_aio_procs--; 853 #ifdef DIAGNOSTIC 854 if (mycp->p_vmspace->vm_refcnt <= 1) { 855 printf("AIOD: bad vm refcnt for" 856 " exiting daemon: %d\n", 857 mycp->p_vmspace->vm_refcnt); 858 } 859 #endif 860 exit1(mycp, 0); 861 } 862 } 863 splx(s); 864 } 865 } 866 } 867 868 /* 869 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 870 * AIO daemon modifies its environment itself. 871 */ 872 static int 873 aio_newproc() 874 { 875 int error; 876 struct proc *p, *np; 877 878 p = &proc0; 879 error = fork1(p, RFPROC|RFMEM|RFNOWAIT, &np); 880 if (error) 881 return error; 882 cpu_set_fork_handler(np, aio_daemon, curproc); 883 884 /* 885 * Wait until daemon is started, but continue on just in case to 886 * handle error conditions. 887 */ 888 error = tsleep(np, PZERO, "aiosta", aiod_timeout); 889 num_aio_procs++; 890 891 return error; 892 } 893 894 /* 895 * Try the high-performance, low-overhead physio method for eligible 896 * VCHR devices. This method doesn't use an aio helper thread, and 897 * thus has very low overhead. 898 * 899 * Assumes that the caller, _aio_aqueue(), has incremented the file 900 * structure's reference count, preventing its deallocation for the 901 * duration of this call. 902 */ 903 static int 904 aio_qphysio(struct proc *p, struct aiocblist *aiocbe) 905 { 906 int error; 907 struct aiocb *cb; 908 struct file *fp; 909 struct buf *bp; 910 struct vnode *vp; 911 struct kaioinfo *ki; 912 struct aio_liojob *lj; 913 int s; 914 int notify; 915 916 cb = &aiocbe->uaiocb; 917 fp = aiocbe->fd_file; 918 919 if (fp->f_type != DTYPE_VNODE) 920 return (-1); 921 922 vp = (struct vnode *)fp->f_data; 923 924 /* 925 * If its not a disk, we don't want to return a positive error. 926 * It causes the aio code to not fall through to try the thread 927 * way when you're talking to a regular file. 928 */ 929 if (!vn_isdisk(vp, &error)) { 930 if (error == ENOTBLK) 931 return (-1); 932 else 933 return (error); 934 } 935 936 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys) 937 return (-1); 938 939 if (cb->aio_nbytes > 940 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK)) 941 return (-1); 942 943 ki = p->p_aioinfo; 944 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) 945 return (-1); 946 947 ki->kaio_buffer_count++; 948 949 lj = aiocbe->lio; 950 if (lj) 951 lj->lioj_buffer_count++; 952 953 /* Create and build a buffer header for a transfer. */ 954 bp = (struct buf *)getpbuf(NULL); 955 BUF_KERNPROC(bp); 956 957 /* 958 * Get a copy of the kva from the physical buffer. 959 */ 960 bp->b_caller1 = p; 961 bp->b_dev = vp->v_rdev; 962 error = 0; 963 964 bp->b_bcount = cb->aio_nbytes; 965 bp->b_bufsize = cb->aio_nbytes; 966 bp->b_flags = B_PHYS | B_CALL | (cb->aio_lio_opcode == LIO_WRITE ? 967 B_WRITE : B_READ); 968 bp->b_iodone = aio_physwakeup; 969 bp->b_saveaddr = bp->b_data; 970 bp->b_data = (void *)(uintptr_t)cb->aio_buf; 971 bp->b_blkno = btodb(cb->aio_offset); 972 973 /* Bring buffer into kernel space. */ 974 if (vmapbuf(bp) < 0) { 975 error = EFAULT; 976 goto doerror; 977 } 978 979 s = splbio(); 980 aiocbe->bp = bp; 981 bp->b_spc = (void *)aiocbe; 982 TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list); 983 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); 984 aiocbe->jobstate = JOBST_JOBQBUF; 985 cb->_aiocb_private.status = cb->aio_nbytes; 986 num_buf_aio++; 987 bp->b_error = 0; 988 989 splx(s); 990 991 /* Perform transfer. */ 992 BUF_STRATEGY(bp, 0); 993 994 notify = 0; 995 s = splbio(); 996 997 /* 998 * If we had an error invoking the request, or an error in processing 999 * the request before we have returned, we process it as an error in 1000 * transfer. Note that such an I/O error is not indicated immediately, 1001 * but is returned using the aio_error mechanism. In this case, 1002 * aio_suspend will return immediately. 1003 */ 1004 if (bp->b_error || (bp->b_flags & B_ERROR)) { 1005 struct aiocb *job = aiocbe->uuaiocb; 1006 1007 aiocbe->uaiocb._aiocb_private.status = 0; 1008 suword(&job->_aiocb_private.status, 0); 1009 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 1010 suword(&job->_aiocb_private.error, bp->b_error); 1011 1012 ki->kaio_buffer_finished_count++; 1013 1014 if (aiocbe->jobstate != JOBST_JOBBFINISHED) { 1015 aiocbe->jobstate = JOBST_JOBBFINISHED; 1016 aiocbe->jobflags |= AIOCBLIST_DONE; 1017 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 1018 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 1019 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 1020 notify = 1; 1021 } 1022 } 1023 splx(s); 1024 if (notify) 1025 KNOTE(&aiocbe->klist, 0); 1026 return 0; 1027 1028 doerror: 1029 ki->kaio_buffer_count--; 1030 if (lj) 1031 lj->lioj_buffer_count--; 1032 aiocbe->bp = NULL; 1033 relpbuf(bp, NULL); 1034 return error; 1035 } 1036 1037 /* 1038 * This waits/tests physio completion. 1039 */ 1040 static int 1041 aio_fphysio(struct aiocblist *iocb) 1042 { 1043 int s; 1044 struct buf *bp; 1045 int error; 1046 1047 bp = iocb->bp; 1048 1049 s = splbio(); 1050 while ((bp->b_flags & B_DONE) == 0) { 1051 if (tsleep(bp, PRIBIO, "physstr", aiod_timeout)) { 1052 if ((bp->b_flags & B_DONE) == 0) { 1053 splx(s); 1054 return EINPROGRESS; 1055 } else 1056 break; 1057 } 1058 } 1059 splx(s); 1060 1061 /* Release mapping into kernel space. */ 1062 vunmapbuf(bp); 1063 iocb->bp = 0; 1064 1065 error = 0; 1066 1067 /* Check for an error. */ 1068 if (bp->b_flags & B_ERROR) 1069 error = bp->b_error; 1070 1071 relpbuf(bp, NULL); 1072 return (error); 1073 } 1074 #endif /* VFS_AIO */ 1075 1076 /* 1077 * Wake up aio requests that may be serviceable now. 1078 */ 1079 void 1080 aio_swake(struct socket *so, struct sockbuf *sb) 1081 { 1082 #ifndef VFS_AIO 1083 return; 1084 #else 1085 struct aiocblist *cb,*cbn; 1086 struct proc *p; 1087 struct kaioinfo *ki = NULL; 1088 int opcode, wakecount = 0; 1089 struct aioproclist *aiop; 1090 1091 if (sb == &so->so_snd) { 1092 opcode = LIO_WRITE; 1093 so->so_snd.sb_flags &= ~SB_AIO; 1094 } else { 1095 opcode = LIO_READ; 1096 so->so_rcv.sb_flags &= ~SB_AIO; 1097 } 1098 1099 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) { 1100 cbn = TAILQ_NEXT(cb, list); 1101 if (opcode == cb->uaiocb.aio_lio_opcode) { 1102 p = cb->userproc; 1103 ki = p->p_aioinfo; 1104 TAILQ_REMOVE(&so->so_aiojobq, cb, list); 1105 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist); 1106 TAILQ_INSERT_TAIL(&aio_jobs, cb, list); 1107 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist); 1108 wakecount++; 1109 if (cb->jobstate != JOBST_JOBQGLOBAL) 1110 panic("invalid queue value"); 1111 } 1112 } 1113 1114 while (wakecount--) { 1115 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) { 1116 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1117 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1118 aiop->aioprocflags &= ~AIOP_FREE; 1119 wakeup(aiop->aioproc); 1120 } 1121 } 1122 #endif /* VFS_AIO */ 1123 } 1124 1125 #ifdef VFS_AIO 1126 /* 1127 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR 1128 * technique is done in this code. 1129 */ 1130 static int 1131 _aio_aqueue(struct proc *p, struct aiocb *job, struct aio_liojob *lj, int type) 1132 { 1133 struct filedesc *fdp; 1134 struct file *fp; 1135 unsigned int fd; 1136 struct socket *so; 1137 int s; 1138 int error; 1139 int opcode, user_opcode; 1140 struct aiocblist *aiocbe; 1141 struct aioproclist *aiop; 1142 struct kaioinfo *ki; 1143 struct kevent kev; 1144 struct kqueue *kq; 1145 struct file *kq_fp; 1146 1147 if ((aiocbe = TAILQ_FIRST(&aio_freejobs)) != NULL) 1148 TAILQ_REMOVE(&aio_freejobs, aiocbe, list); 1149 else 1150 aiocbe = zalloc (aiocb_zone); 1151 1152 aiocbe->inputcharge = 0; 1153 aiocbe->outputcharge = 0; 1154 callout_handle_init(&aiocbe->timeouthandle); 1155 SLIST_INIT(&aiocbe->klist); 1156 1157 suword(&job->_aiocb_private.status, -1); 1158 suword(&job->_aiocb_private.error, 0); 1159 suword(&job->_aiocb_private.kernelinfo, -1); 1160 1161 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb)); 1162 if (error) { 1163 suword(&job->_aiocb_private.error, error); 1164 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1165 return error; 1166 } 1167 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL && 1168 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) { 1169 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1170 return EINVAL; 1171 } 1172 1173 /* Save userspace address of the job info. */ 1174 aiocbe->uuaiocb = job; 1175 1176 /* Get the opcode. */ 1177 user_opcode = aiocbe->uaiocb.aio_lio_opcode; 1178 if (type != LIO_NOP) 1179 aiocbe->uaiocb.aio_lio_opcode = type; 1180 opcode = aiocbe->uaiocb.aio_lio_opcode; 1181 1182 /* Get the fd info for process. */ 1183 fdp = p->p_fd; 1184 1185 /* 1186 * Range check file descriptor. 1187 */ 1188 fd = aiocbe->uaiocb.aio_fildes; 1189 if (fd >= fdp->fd_nfiles) { 1190 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1191 if (type == 0) 1192 suword(&job->_aiocb_private.error, EBADF); 1193 return EBADF; 1194 } 1195 1196 fp = aiocbe->fd_file = fdp->fd_ofiles[fd]; 1197 if ((fp == NULL) || ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) == 1198 0))) { 1199 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1200 if (type == 0) 1201 suword(&job->_aiocb_private.error, EBADF); 1202 return EBADF; 1203 } 1204 fhold(fp); 1205 1206 if (aiocbe->uaiocb.aio_offset == -1LL) { 1207 error = EINVAL; 1208 goto aqueue_fail; 1209 } 1210 error = suword(&job->_aiocb_private.kernelinfo, jobrefid); 1211 if (error) { 1212 error = EINVAL; 1213 goto aqueue_fail; 1214 } 1215 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid; 1216 if (jobrefid == LONG_MAX) 1217 jobrefid = 1; 1218 else 1219 jobrefid++; 1220 1221 if (opcode == LIO_NOP) { 1222 fdrop(fp, p); 1223 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1224 if (type == 0) { 1225 suword(&job->_aiocb_private.error, 0); 1226 suword(&job->_aiocb_private.status, 0); 1227 suword(&job->_aiocb_private.kernelinfo, 0); 1228 } 1229 return 0; 1230 } 1231 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) { 1232 if (type == 0) 1233 suword(&job->_aiocb_private.status, 0); 1234 error = EINVAL; 1235 goto aqueue_fail; 1236 } 1237 1238 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) { 1239 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue; 1240 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr; 1241 } 1242 else { 1243 /* 1244 * This method for requesting kevent-based notification won't 1245 * work on the alpha, since we're passing in a pointer 1246 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT- 1247 * based method instead. 1248 */ 1249 if (user_opcode == LIO_NOP || user_opcode == LIO_READ || 1250 user_opcode == LIO_WRITE) 1251 goto no_kqueue; 1252 1253 error = copyin((struct kevent *)(uintptr_t)user_opcode, 1254 &kev, sizeof(kev)); 1255 if (error) 1256 goto aqueue_fail; 1257 } 1258 if ((u_int)kev.ident >= fdp->fd_nfiles || 1259 (kq_fp = fdp->fd_ofiles[kev.ident]) == NULL || 1260 (kq_fp->f_type != DTYPE_KQUEUE)) { 1261 error = EBADF; 1262 goto aqueue_fail; 1263 } 1264 kq = (struct kqueue *)kq_fp->f_data; 1265 kev.ident = (uintptr_t)aiocbe->uuaiocb; 1266 kev.filter = EVFILT_AIO; 1267 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 1268 kev.data = (intptr_t)aiocbe; 1269 error = kqueue_register(kq, &kev, p); 1270 aqueue_fail: 1271 if (error) { 1272 fdrop(fp, p); 1273 TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list); 1274 if (type == 0) 1275 suword(&job->_aiocb_private.error, error); 1276 goto done; 1277 } 1278 no_kqueue: 1279 1280 suword(&job->_aiocb_private.error, EINPROGRESS); 1281 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; 1282 aiocbe->userproc = p; 1283 aiocbe->jobflags = 0; 1284 aiocbe->lio = lj; 1285 ki = p->p_aioinfo; 1286 1287 if (fp->f_type == DTYPE_SOCKET) { 1288 /* 1289 * Alternate queueing for socket ops: Reach down into the 1290 * descriptor to get the socket data. Then check to see if the 1291 * socket is ready to be read or written (based on the requested 1292 * operation). 1293 * 1294 * If it is not ready for io, then queue the aiocbe on the 1295 * socket, and set the flags so we get a call when sbnotify() 1296 * happens. 1297 */ 1298 so = (struct socket *)fp->f_data; 1299 s = splnet(); 1300 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode == 1301 LIO_WRITE) && (!sowriteable(so)))) { 1302 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list); 1303 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist); 1304 if (opcode == LIO_READ) 1305 so->so_rcv.sb_flags |= SB_AIO; 1306 else 1307 so->so_snd.sb_flags |= SB_AIO; 1308 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */ 1309 ki->kaio_queue_count++; 1310 num_queue_count++; 1311 splx(s); 1312 error = 0; 1313 goto done; 1314 } 1315 splx(s); 1316 } 1317 1318 if ((error = aio_qphysio(p, aiocbe)) == 0) 1319 goto done; 1320 if (error > 0) { 1321 suword(&job->_aiocb_private.status, 0); 1322 aiocbe->uaiocb._aiocb_private.error = error; 1323 suword(&job->_aiocb_private.error, error); 1324 goto done; 1325 } 1326 1327 /* No buffer for daemon I/O. */ 1328 aiocbe->bp = NULL; 1329 1330 ki->kaio_queue_count++; 1331 if (lj) 1332 lj->lioj_queue_count++; 1333 s = splnet(); 1334 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); 1335 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); 1336 splx(s); 1337 aiocbe->jobstate = JOBST_JOBQGLOBAL; 1338 1339 num_queue_count++; 1340 error = 0; 1341 1342 /* 1343 * If we don't have a free AIO process, and we are below our quota, then 1344 * start one. Otherwise, depend on the subsequent I/O completions to 1345 * pick-up this job. If we don't sucessfully create the new process 1346 * (thread) due to resource issues, we return an error for now (EAGAIN), 1347 * which is likely not the correct thing to do. 1348 */ 1349 s = splnet(); 1350 retryproc: 1351 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1352 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1353 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1354 aiop->aioprocflags &= ~AIOP_FREE; 1355 wakeup(aiop->aioproc); 1356 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && 1357 ((ki->kaio_active_count + num_aio_resv_start) < 1358 ki->kaio_maxactive_count)) { 1359 num_aio_resv_start++; 1360 if ((error = aio_newproc()) == 0) { 1361 num_aio_resv_start--; 1362 goto retryproc; 1363 } 1364 num_aio_resv_start--; 1365 } 1366 splx(s); 1367 done: 1368 return error; 1369 } 1370 1371 /* 1372 * This routine queues an AIO request, checking for quotas. 1373 */ 1374 static int 1375 aio_aqueue(struct proc *p, struct aiocb *job, int type) 1376 { 1377 struct kaioinfo *ki; 1378 1379 if (p->p_aioinfo == NULL) 1380 aio_init_aioinfo(p); 1381 1382 if (num_queue_count >= max_queue_count) 1383 return EAGAIN; 1384 1385 ki = p->p_aioinfo; 1386 if (ki->kaio_queue_count >= ki->kaio_qallowed_count) 1387 return EAGAIN; 1388 1389 return _aio_aqueue(p, job, NULL, type); 1390 } 1391 #endif /* VFS_AIO */ 1392 1393 /* 1394 * Support the aio_return system call, as a side-effect, kernel resources are 1395 * released. 1396 */ 1397 int 1398 aio_return(struct proc *p, struct aio_return_args *uap) 1399 { 1400 #ifndef VFS_AIO 1401 return ENOSYS; 1402 #else 1403 int s; 1404 long jobref; 1405 struct aiocblist *cb, *ncb; 1406 struct aiocb *ujob; 1407 struct kaioinfo *ki; 1408 1409 ki = p->p_aioinfo; 1410 if (ki == NULL) 1411 return EINVAL; 1412 1413 ujob = uap->aiocbp; 1414 1415 jobref = fuword(&ujob->_aiocb_private.kernelinfo); 1416 if (jobref == -1 || jobref == 0) 1417 return EINVAL; 1418 1419 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1420 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == 1421 jobref) { 1422 if (ujob == cb->uuaiocb) { 1423 p->p_retval[0] = 1424 cb->uaiocb._aiocb_private.status; 1425 } else 1426 p->p_retval[0] = EFAULT; 1427 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 1428 p->p_stats->p_ru.ru_oublock += 1429 cb->outputcharge; 1430 cb->outputcharge = 0; 1431 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 1432 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 1433 cb->inputcharge = 0; 1434 } 1435 aio_free_entry(cb); 1436 return 0; 1437 } 1438 } 1439 s = splbio(); 1440 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) { 1441 ncb = TAILQ_NEXT(cb, plist); 1442 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) 1443 == jobref) { 1444 splx(s); 1445 if (ujob == cb->uuaiocb) { 1446 p->p_retval[0] = 1447 cb->uaiocb._aiocb_private.status; 1448 } else 1449 p->p_retval[0] = EFAULT; 1450 aio_free_entry(cb); 1451 return 0; 1452 } 1453 } 1454 splx(s); 1455 1456 return (EINVAL); 1457 #endif /* VFS_AIO */ 1458 } 1459 1460 /* 1461 * Allow a process to wakeup when any of the I/O requests are completed. 1462 */ 1463 int 1464 aio_suspend(struct proc *p, struct aio_suspend_args *uap) 1465 { 1466 #ifndef VFS_AIO 1467 return ENOSYS; 1468 #else 1469 struct timeval atv; 1470 struct timespec ts; 1471 struct aiocb *const *cbptr, *cbp; 1472 struct kaioinfo *ki; 1473 struct aiocblist *cb; 1474 int i; 1475 int njoblist; 1476 int error, s, timo; 1477 long *ijoblist; 1478 struct aiocb **ujoblist; 1479 1480 if (uap->nent > AIO_LISTIO_MAX) 1481 return EINVAL; 1482 1483 timo = 0; 1484 if (uap->timeout) { 1485 /* Get timespec struct. */ 1486 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 1487 return error; 1488 1489 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) 1490 return (EINVAL); 1491 1492 TIMESPEC_TO_TIMEVAL(&atv, &ts); 1493 if (itimerfix(&atv)) 1494 return (EINVAL); 1495 timo = tvtohz(&atv); 1496 } 1497 1498 ki = p->p_aioinfo; 1499 if (ki == NULL) 1500 return EAGAIN; 1501 1502 njoblist = 0; 1503 ijoblist = zalloc(aiol_zone); 1504 ujoblist = zalloc(aiol_zone); 1505 cbptr = uap->aiocbp; 1506 1507 for (i = 0; i < uap->nent; i++) { 1508 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1509 if (cbp == 0) 1510 continue; 1511 ujoblist[njoblist] = cbp; 1512 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo); 1513 njoblist++; 1514 } 1515 1516 if (njoblist == 0) { 1517 zfree(aiol_zone, ijoblist); 1518 zfree(aiol_zone, ujoblist); 1519 return 0; 1520 } 1521 1522 error = 0; 1523 for (;;) { 1524 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1525 for (i = 0; i < njoblist; i++) { 1526 if (((intptr_t) 1527 cb->uaiocb._aiocb_private.kernelinfo) == 1528 ijoblist[i]) { 1529 if (ujoblist[i] != cb->uuaiocb) 1530 error = EINVAL; 1531 zfree(aiol_zone, ijoblist); 1532 zfree(aiol_zone, ujoblist); 1533 return error; 1534 } 1535 } 1536 } 1537 1538 s = splbio(); 1539 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = 1540 TAILQ_NEXT(cb, plist)) { 1541 for (i = 0; i < njoblist; i++) { 1542 if (((intptr_t) 1543 cb->uaiocb._aiocb_private.kernelinfo) == 1544 ijoblist[i]) { 1545 splx(s); 1546 if (ujoblist[i] != cb->uuaiocb) 1547 error = EINVAL; 1548 zfree(aiol_zone, ijoblist); 1549 zfree(aiol_zone, ujoblist); 1550 return error; 1551 } 1552 } 1553 } 1554 1555 ki->kaio_flags |= KAIO_WAKEUP; 1556 error = tsleep(p, PRIBIO | PCATCH, "aiospn", timo); 1557 splx(s); 1558 1559 if (error == ERESTART || error == EINTR) { 1560 zfree(aiol_zone, ijoblist); 1561 zfree(aiol_zone, ujoblist); 1562 return EINTR; 1563 } else if (error == EWOULDBLOCK) { 1564 zfree(aiol_zone, ijoblist); 1565 zfree(aiol_zone, ujoblist); 1566 return EAGAIN; 1567 } 1568 } 1569 1570 /* NOTREACHED */ 1571 return EINVAL; 1572 #endif /* VFS_AIO */ 1573 } 1574 1575 /* 1576 * aio_cancel cancels any non-physio aio operations not currently in 1577 * progress. 1578 */ 1579 int 1580 aio_cancel(struct proc *p, struct aio_cancel_args *uap) 1581 { 1582 #ifndef VFS_AIO 1583 return ENOSYS; 1584 #else 1585 struct kaioinfo *ki; 1586 struct aiocblist *cbe, *cbn; 1587 struct file *fp; 1588 struct filedesc *fdp; 1589 struct socket *so; 1590 struct proc *po; 1591 int s,error; 1592 int cancelled=0; 1593 int notcancelled=0; 1594 struct vnode *vp; 1595 1596 fdp = p->p_fd; 1597 if ((u_int)uap->fd >= fdp->fd_nfiles || 1598 (fp = fdp->fd_ofiles[uap->fd]) == NULL) 1599 return (EBADF); 1600 1601 if (fp->f_type == DTYPE_VNODE) { 1602 vp = (struct vnode *)fp->f_data; 1603 1604 if (vn_isdisk(vp,&error)) { 1605 p->p_retval[0] = AIO_NOTCANCELED; 1606 return 0; 1607 } 1608 } else if (fp->f_type == DTYPE_SOCKET) { 1609 so = (struct socket *)fp->f_data; 1610 1611 s = splnet(); 1612 1613 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) { 1614 cbn = TAILQ_NEXT(cbe, list); 1615 if ((uap->aiocbp == NULL) || 1616 (uap->aiocbp == cbe->uuaiocb) ) { 1617 po = cbe->userproc; 1618 ki = po->p_aioinfo; 1619 TAILQ_REMOVE(&so->so_aiojobq, cbe, list); 1620 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist); 1621 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist); 1622 if (ki->kaio_flags & KAIO_WAKEUP) { 1623 wakeup(po); 1624 } 1625 cbe->jobstate = JOBST_JOBFINISHED; 1626 cbe->uaiocb._aiocb_private.status=-1; 1627 cbe->uaiocb._aiocb_private.error=ECANCELED; 1628 cancelled++; 1629 /* XXX cancelled, knote? */ 1630 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1631 SIGEV_SIGNAL) 1632 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1633 if (uap->aiocbp) 1634 break; 1635 } 1636 } 1637 splx(s); 1638 1639 if ((cancelled) && (uap->aiocbp)) { 1640 p->p_retval[0] = AIO_CANCELED; 1641 return 0; 1642 } 1643 } 1644 ki=p->p_aioinfo; 1645 if (ki == NULL) 1646 goto done; 1647 s = splnet(); 1648 1649 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) { 1650 cbn = TAILQ_NEXT(cbe, plist); 1651 1652 if ((uap->fd == cbe->uaiocb.aio_fildes) && 1653 ((uap->aiocbp == NULL ) || 1654 (uap->aiocbp == cbe->uuaiocb))) { 1655 1656 if (cbe->jobstate == JOBST_JOBQGLOBAL) { 1657 TAILQ_REMOVE(&aio_jobs, cbe, list); 1658 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); 1659 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, 1660 plist); 1661 cancelled++; 1662 ki->kaio_queue_finished_count++; 1663 cbe->jobstate = JOBST_JOBFINISHED; 1664 cbe->uaiocb._aiocb_private.status = -1; 1665 cbe->uaiocb._aiocb_private.error = ECANCELED; 1666 /* XXX cancelled, knote? */ 1667 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1668 SIGEV_SIGNAL) 1669 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1670 } else { 1671 notcancelled++; 1672 } 1673 } 1674 } 1675 splx(s); 1676 done: 1677 if (notcancelled) { 1678 p->p_retval[0] = AIO_NOTCANCELED; 1679 return 0; 1680 } 1681 if (cancelled) { 1682 p->p_retval[0] = AIO_CANCELED; 1683 return 0; 1684 } 1685 p->p_retval[0] = AIO_ALLDONE; 1686 1687 return 0; 1688 #endif /* VFS_AIO */ 1689 } 1690 1691 /* 1692 * aio_error is implemented in the kernel level for compatibility purposes only. 1693 * For a user mode async implementation, it would be best to do it in a userland 1694 * subroutine. 1695 */ 1696 int 1697 aio_error(struct proc *p, struct aio_error_args *uap) 1698 { 1699 #ifndef VFS_AIO 1700 return ENOSYS; 1701 #else 1702 int s; 1703 struct aiocblist *cb; 1704 struct kaioinfo *ki; 1705 long jobref; 1706 1707 ki = p->p_aioinfo; 1708 if (ki == NULL) 1709 return EINVAL; 1710 1711 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo); 1712 if ((jobref == -1) || (jobref == 0)) 1713 return EINVAL; 1714 1715 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1716 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1717 jobref) { 1718 p->p_retval[0] = cb->uaiocb._aiocb_private.error; 1719 return 0; 1720 } 1721 } 1722 1723 s = splnet(); 1724 1725 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb, 1726 plist)) { 1727 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1728 jobref) { 1729 p->p_retval[0] = EINPROGRESS; 1730 splx(s); 1731 return 0; 1732 } 1733 } 1734 1735 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb, 1736 plist)) { 1737 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1738 jobref) { 1739 p->p_retval[0] = EINPROGRESS; 1740 splx(s); 1741 return 0; 1742 } 1743 } 1744 splx(s); 1745 1746 s = splbio(); 1747 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, 1748 plist)) { 1749 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1750 jobref) { 1751 p->p_retval[0] = cb->uaiocb._aiocb_private.error; 1752 splx(s); 1753 return 0; 1754 } 1755 } 1756 1757 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb, 1758 plist)) { 1759 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1760 jobref) { 1761 p->p_retval[0] = EINPROGRESS; 1762 splx(s); 1763 return 0; 1764 } 1765 } 1766 splx(s); 1767 1768 #if (0) 1769 /* 1770 * Hack for lio. 1771 */ 1772 status = fuword(&uap->aiocbp->_aiocb_private.status); 1773 if (status == -1) 1774 return fuword(&uap->aiocbp->_aiocb_private.error); 1775 #endif 1776 return EINVAL; 1777 #endif /* VFS_AIO */ 1778 } 1779 1780 /* syscall - asynchronous read from a file (REALTIME) */ 1781 int 1782 aio_read(struct proc *p, struct aio_read_args *uap) 1783 { 1784 #ifndef VFS_AIO 1785 return ENOSYS; 1786 #else 1787 return aio_aqueue(p, uap->aiocbp, LIO_READ); 1788 #endif /* VFS_AIO */ 1789 } 1790 1791 /* syscall - asynchronous write to a file (REALTIME) */ 1792 int 1793 aio_write(struct proc *p, struct aio_write_args *uap) 1794 { 1795 #ifndef VFS_AIO 1796 return ENOSYS; 1797 #else 1798 return aio_aqueue(p, uap->aiocbp, LIO_WRITE); 1799 #endif /* VFS_AIO */ 1800 } 1801 1802 /* syscall - XXX undocumented */ 1803 int 1804 lio_listio(struct proc *p, struct lio_listio_args *uap) 1805 { 1806 #ifndef VFS_AIO 1807 return ENOSYS; 1808 #else 1809 int nent, nentqueued; 1810 struct aiocb *iocb, * const *cbptr; 1811 struct aiocblist *cb; 1812 struct kaioinfo *ki; 1813 struct aio_liojob *lj; 1814 int error, runningcode; 1815 int nerror; 1816 int i; 1817 int s; 1818 1819 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 1820 return EINVAL; 1821 1822 nent = uap->nent; 1823 if (nent > AIO_LISTIO_MAX) 1824 return EINVAL; 1825 1826 if (p->p_aioinfo == NULL) 1827 aio_init_aioinfo(p); 1828 1829 if ((nent + num_queue_count) > max_queue_count) 1830 return EAGAIN; 1831 1832 ki = p->p_aioinfo; 1833 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) 1834 return EAGAIN; 1835 1836 lj = zalloc(aiolio_zone); 1837 if (!lj) 1838 return EAGAIN; 1839 1840 lj->lioj_flags = 0; 1841 lj->lioj_buffer_count = 0; 1842 lj->lioj_buffer_finished_count = 0; 1843 lj->lioj_queue_count = 0; 1844 lj->lioj_queue_finished_count = 0; 1845 lj->lioj_ki = ki; 1846 1847 /* 1848 * Setup signal. 1849 */ 1850 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 1851 error = copyin(uap->sig, &lj->lioj_signal, 1852 sizeof(lj->lioj_signal)); 1853 if (error) { 1854 zfree(aiolio_zone, lj); 1855 return error; 1856 } 1857 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 1858 zfree(aiolio_zone, lj); 1859 return EINVAL; 1860 } 1861 lj->lioj_flags |= LIOJ_SIGNAL; 1862 lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED; 1863 } else 1864 lj->lioj_flags &= ~LIOJ_SIGNAL; 1865 1866 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 1867 /* 1868 * Get pointers to the list of I/O requests. 1869 */ 1870 nerror = 0; 1871 nentqueued = 0; 1872 cbptr = uap->acb_list; 1873 for (i = 0; i < uap->nent; i++) { 1874 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1875 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) { 1876 error = _aio_aqueue(p, iocb, lj, 0); 1877 if (error == 0) 1878 nentqueued++; 1879 else 1880 nerror++; 1881 } 1882 } 1883 1884 /* 1885 * If we haven't queued any, then just return error. 1886 */ 1887 if (nentqueued == 0) 1888 return 0; 1889 1890 /* 1891 * Calculate the appropriate error return. 1892 */ 1893 runningcode = 0; 1894 if (nerror) 1895 runningcode = EIO; 1896 1897 if (uap->mode == LIO_WAIT) { 1898 int command, found, jobref; 1899 1900 for (;;) { 1901 found = 0; 1902 for (i = 0; i < uap->nent; i++) { 1903 /* 1904 * Fetch address of the control buf pointer in 1905 * user space. 1906 */ 1907 iocb = (struct aiocb *) 1908 (intptr_t)fuword(&cbptr[i]); 1909 if (((intptr_t)iocb == -1) || ((intptr_t)iocb 1910 == 0)) 1911 continue; 1912 1913 /* 1914 * Fetch the associated command from user space. 1915 */ 1916 command = fuword(&iocb->aio_lio_opcode); 1917 if (command == LIO_NOP) { 1918 found++; 1919 continue; 1920 } 1921 1922 jobref = fuword(&iocb->_aiocb_private.kernelinfo); 1923 1924 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1925 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 1926 == jobref) { 1927 if (cb->uaiocb.aio_lio_opcode 1928 == LIO_WRITE) { 1929 p->p_stats->p_ru.ru_oublock 1930 += 1931 cb->outputcharge; 1932 cb->outputcharge = 0; 1933 } else if (cb->uaiocb.aio_lio_opcode 1934 == LIO_READ) { 1935 p->p_stats->p_ru.ru_inblock 1936 += cb->inputcharge; 1937 cb->inputcharge = 0; 1938 } 1939 found++; 1940 break; 1941 } 1942 } 1943 1944 s = splbio(); 1945 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) { 1946 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 1947 == jobref) { 1948 found++; 1949 break; 1950 } 1951 } 1952 splx(s); 1953 } 1954 1955 /* 1956 * If all I/Os have been disposed of, then we can 1957 * return. 1958 */ 1959 if (found == nentqueued) 1960 return runningcode; 1961 1962 ki->kaio_flags |= KAIO_WAKEUP; 1963 error = tsleep(p, PRIBIO | PCATCH, "aiospn", 0); 1964 1965 if (error == EINTR) 1966 return EINTR; 1967 else if (error == EWOULDBLOCK) 1968 return EAGAIN; 1969 } 1970 } 1971 1972 return runningcode; 1973 #endif /* VFS_AIO */ 1974 } 1975 1976 #ifdef VFS_AIO 1977 /* 1978 * This is a weird hack so that we can post a signal. It is safe to do so from 1979 * a timeout routine, but *not* from an interrupt routine. 1980 */ 1981 static void 1982 process_signal(void *aioj) 1983 { 1984 struct aiocblist *aiocbe = aioj; 1985 struct aio_liojob *lj = aiocbe->lio; 1986 struct aiocb *cb = &aiocbe->uaiocb; 1987 1988 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) && 1989 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) { 1990 psignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo); 1991 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 1992 } 1993 1994 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) 1995 psignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo); 1996 } 1997 1998 /* 1999 * Interrupt handler for physio, performs the necessary process wakeups, and 2000 * signals. 2001 */ 2002 static void 2003 aio_physwakeup(struct buf *bp) 2004 { 2005 struct aiocblist *aiocbe; 2006 struct proc *p; 2007 struct kaioinfo *ki; 2008 struct aio_liojob *lj; 2009 2010 wakeup(bp); 2011 2012 aiocbe = (struct aiocblist *)bp->b_spc; 2013 if (aiocbe) { 2014 p = bp->b_caller1; 2015 2016 aiocbe->jobstate = JOBST_JOBBFINISHED; 2017 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; 2018 aiocbe->uaiocb._aiocb_private.error = 0; 2019 aiocbe->jobflags |= AIOCBLIST_DONE; 2020 2021 if (bp->b_flags & B_ERROR) 2022 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 2023 2024 lj = aiocbe->lio; 2025 if (lj) { 2026 lj->lioj_buffer_finished_count++; 2027 2028 /* 2029 * wakeup/signal if all of the interrupt jobs are done. 2030 */ 2031 if (lj->lioj_buffer_finished_count == 2032 lj->lioj_buffer_count) { 2033 /* 2034 * Post a signal if it is called for. 2035 */ 2036 if ((lj->lioj_flags & 2037 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == 2038 LIOJ_SIGNAL) { 2039 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2040 aiocbe->timeouthandle = 2041 timeout(process_signal, 2042 aiocbe, 0); 2043 } 2044 } 2045 } 2046 2047 ki = p->p_aioinfo; 2048 if (ki) { 2049 ki->kaio_buffer_finished_count++; 2050 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 2051 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 2052 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 2053 2054 KNOTE(&aiocbe->klist, 0); 2055 /* Do the wakeup. */ 2056 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) { 2057 ki->kaio_flags &= ~KAIO_WAKEUP; 2058 wakeup(p); 2059 } 2060 } 2061 2062 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) 2063 aiocbe->timeouthandle = 2064 timeout(process_signal, aiocbe, 0); 2065 } 2066 } 2067 #endif /* VFS_AIO */ 2068 2069 /* syscall - wait for the next completion of an aio request */ 2070 int 2071 aio_waitcomplete(struct proc *p, struct aio_waitcomplete_args *uap) 2072 { 2073 #ifndef VFS_AIO 2074 return ENOSYS; 2075 #else 2076 struct timeval atv; 2077 struct timespec ts; 2078 struct kaioinfo *ki; 2079 struct aiocblist *cb = NULL; 2080 int error, s, timo; 2081 2082 suword(uap->aiocbp, (int)NULL); 2083 2084 timo = 0; 2085 if (uap->timeout) { 2086 /* Get timespec struct. */ 2087 error = copyin(uap->timeout, &ts, sizeof(ts)); 2088 if (error) 2089 return error; 2090 2091 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000)) 2092 return (EINVAL); 2093 2094 TIMESPEC_TO_TIMEVAL(&atv, &ts); 2095 if (itimerfix(&atv)) 2096 return (EINVAL); 2097 timo = tvtohz(&atv); 2098 } 2099 2100 ki = p->p_aioinfo; 2101 if (ki == NULL) 2102 return EAGAIN; 2103 2104 for (;;) { 2105 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) { 2106 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2107 p->p_retval[0] = cb->uaiocb._aiocb_private.status; 2108 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 2109 p->p_stats->p_ru.ru_oublock += 2110 cb->outputcharge; 2111 cb->outputcharge = 0; 2112 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 2113 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 2114 cb->inputcharge = 0; 2115 } 2116 aio_free_entry(cb); 2117 return cb->uaiocb._aiocb_private.error; 2118 } 2119 2120 s = splbio(); 2121 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) { 2122 splx(s); 2123 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2124 p->p_retval[0] = cb->uaiocb._aiocb_private.status; 2125 aio_free_entry(cb); 2126 return cb->uaiocb._aiocb_private.error; 2127 } 2128 2129 ki->kaio_flags |= KAIO_WAKEUP; 2130 error = tsleep(p, PRIBIO | PCATCH, "aiowc", timo); 2131 splx(s); 2132 2133 if (error == ERESTART) 2134 return EINTR; 2135 else if (error < 0) 2136 return error; 2137 else if (error == EINTR) 2138 return EINTR; 2139 else if (error == EWOULDBLOCK) 2140 return EAGAIN; 2141 } 2142 #endif /* VFS_AIO */ 2143 } 2144 2145 #ifndef VFS_AIO 2146 static int 2147 filt_aioattach(struct knote *kn) 2148 { 2149 2150 return (ENXIO); 2151 } 2152 2153 struct filterops aio_filtops = 2154 { 0, filt_aioattach, NULL, NULL }; 2155 2156 #else 2157 /* kqueue attach function */ 2158 static int 2159 filt_aioattach(struct knote *kn) 2160 { 2161 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2162 2163 /* 2164 * The aiocbe pointer must be validated before using it, so 2165 * registration is restricted to the kernel; the user cannot 2166 * set EV_FLAG1. 2167 */ 2168 if ((kn->kn_flags & EV_FLAG1) == 0) 2169 return (EPERM); 2170 kn->kn_flags &= ~EV_FLAG1; 2171 2172 SLIST_INSERT_HEAD(&aiocbe->klist, kn, kn_selnext); 2173 2174 return (0); 2175 } 2176 2177 /* kqueue detach function */ 2178 static void 2179 filt_aiodetach(struct knote *kn) 2180 { 2181 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2182 2183 SLIST_REMOVE(&aiocbe->klist, kn, knote, kn_selnext); 2184 } 2185 2186 /* kqueue filter function */ 2187 /*ARGSUSED*/ 2188 static int 2189 filt_aio(struct knote *kn, long hint) 2190 { 2191 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2192 2193 kn->kn_data = aiocbe->uaiocb._aiocb_private.error; 2194 if (aiocbe->jobstate != JOBST_JOBFINISHED && 2195 aiocbe->jobstate != JOBST_JOBBFINISHED) 2196 return (0); 2197 kn->kn_flags |= EV_EOF; 2198 return (1); 2199 } 2200 2201 struct filterops aio_filtops = 2202 { 0, filt_aioattach, filt_aiodetach, filt_aio }; 2203 #endif /* VFS_AIO */
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