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: releng/5.1/sys/kern/vfs_aio.c 114216 2003-04-29 13:36:06Z kan $ 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/malloc.h> 26 #include <sys/bio.h> 27 #include <sys/buf.h> 28 #include <sys/eventhandler.h> 29 #include <sys/sysproto.h> 30 #include <sys/filedesc.h> 31 #include <sys/kernel.h> 32 #include <sys/kthread.h> 33 #include <sys/fcntl.h> 34 #include <sys/file.h> 35 #include <sys/limits.h> 36 #include <sys/lock.h> 37 #include <sys/mutex.h> 38 #include <sys/unistd.h> 39 #include <sys/proc.h> 40 #include <sys/resourcevar.h> 41 #include <sys/signalvar.h> 42 #include <sys/protosw.h> 43 #include <sys/socketvar.h> 44 #include <sys/syscall.h> 45 #include <sys/sysent.h> 46 #include <sys/sysctl.h> 47 #include <sys/sx.h> 48 #include <sys/vnode.h> 49 #include <sys/conf.h> 50 #include <sys/event.h> 51 52 #include <posix4/posix4.h> 53 #include <vm/vm.h> 54 #include <vm/vm_extern.h> 55 #include <vm/pmap.h> 56 #include <vm/vm_map.h> 57 #include <vm/uma.h> 58 #include <sys/aio.h> 59 60 #include "opt_vfs_aio.h" 61 62 /* 63 * Counter for allocating reference ids to new jobs. Wrapped to 1 on 64 * overflow. 65 */ 66 static long jobrefid; 67 68 #define JOBST_NULL 0x0 69 #define JOBST_JOBQGLOBAL 0x2 70 #define JOBST_JOBRUNNING 0x3 71 #define JOBST_JOBFINISHED 0x4 72 #define JOBST_JOBQBUF 0x5 73 #define JOBST_JOBBFINISHED 0x6 74 75 #ifndef MAX_AIO_PER_PROC 76 #define MAX_AIO_PER_PROC 32 77 #endif 78 79 #ifndef MAX_AIO_QUEUE_PER_PROC 80 #define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */ 81 #endif 82 83 #ifndef MAX_AIO_PROCS 84 #define MAX_AIO_PROCS 32 85 #endif 86 87 #ifndef MAX_AIO_QUEUE 88 #define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */ 89 #endif 90 91 #ifndef TARGET_AIO_PROCS 92 #define TARGET_AIO_PROCS 4 93 #endif 94 95 #ifndef MAX_BUF_AIO 96 #define MAX_BUF_AIO 16 97 #endif 98 99 #ifndef AIOD_TIMEOUT_DEFAULT 100 #define AIOD_TIMEOUT_DEFAULT (10 * hz) 101 #endif 102 103 #ifndef AIOD_LIFETIME_DEFAULT 104 #define AIOD_LIFETIME_DEFAULT (30 * hz) 105 #endif 106 107 SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management"); 108 109 static int max_aio_procs = MAX_AIO_PROCS; 110 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, 111 CTLFLAG_RW, &max_aio_procs, 0, 112 "Maximum number of kernel threads to use for handling async IO "); 113 114 static int num_aio_procs = 0; 115 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, 116 CTLFLAG_RD, &num_aio_procs, 0, 117 "Number of presently active kernel threads for async IO"); 118 119 /* 120 * The code will adjust the actual number of AIO processes towards this 121 * number when it gets a chance. 122 */ 123 static int target_aio_procs = TARGET_AIO_PROCS; 124 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs, 125 0, "Preferred number of ready kernel threads for async IO"); 126 127 static int max_queue_count = MAX_AIO_QUEUE; 128 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0, 129 "Maximum number of aio requests to queue, globally"); 130 131 static int num_queue_count = 0; 132 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0, 133 "Number of queued aio requests"); 134 135 static int num_buf_aio = 0; 136 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0, 137 "Number of aio requests presently handled by the buf subsystem"); 138 139 /* Number of async I/O thread in the process of being started */ 140 /* XXX This should be local to _aio_aqueue() */ 141 static int num_aio_resv_start = 0; 142 143 static int aiod_timeout; 144 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0, 145 "Timeout value for synchronous aio operations"); 146 147 static int aiod_lifetime; 148 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0, 149 "Maximum lifetime for idle aiod"); 150 151 static int unloadable = 0; 152 SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0, 153 "Allow unload of aio (not recommended)"); 154 155 156 static int max_aio_per_proc = MAX_AIO_PER_PROC; 157 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc, 158 0, "Maximum active aio requests per process (stored in the process)"); 159 160 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC; 161 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW, 162 &max_aio_queue_per_proc, 0, 163 "Maximum queued aio requests per process (stored in the process)"); 164 165 static int max_buf_aio = MAX_BUF_AIO; 166 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0, 167 "Maximum buf aio requests per process (stored in the process)"); 168 169 struct aiocblist { 170 TAILQ_ENTRY(aiocblist) list; /* List of jobs */ 171 TAILQ_ENTRY(aiocblist) plist; /* List of jobs for proc */ 172 int jobflags; 173 int jobstate; 174 int inputcharge; 175 int outputcharge; 176 struct callout_handle timeouthandle; 177 struct buf *bp; /* Buffer pointer */ 178 struct proc *userproc; /* User process */ /* Not td! */ 179 struct ucred *cred; /* Active credential when created */ 180 struct file *fd_file; /* Pointer to file structure */ 181 struct aio_liojob *lio; /* Optional lio job */ 182 struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */ 183 struct klist klist; /* list of knotes */ 184 struct aiocb uaiocb; /* Kernel I/O control block */ 185 }; 186 187 /* jobflags */ 188 #define AIOCBLIST_RUNDOWN 0x4 189 #define AIOCBLIST_DONE 0x10 190 191 /* 192 * AIO process info 193 */ 194 #define AIOP_FREE 0x1 /* proc on free queue */ 195 #define AIOP_SCHED 0x2 /* proc explicitly scheduled */ 196 197 struct aiothreadlist { 198 int aiothreadflags; /* AIO proc flags */ 199 TAILQ_ENTRY(aiothreadlist) list; /* List of processes */ 200 struct thread *aiothread; /* The AIO thread */ 201 }; 202 203 /* 204 * data-structure for lio signal management 205 */ 206 struct aio_liojob { 207 int lioj_flags; 208 int lioj_buffer_count; 209 int lioj_buffer_finished_count; 210 int lioj_queue_count; 211 int lioj_queue_finished_count; 212 struct sigevent lioj_signal; /* signal on all I/O done */ 213 TAILQ_ENTRY(aio_liojob) lioj_list; 214 struct kaioinfo *lioj_ki; 215 }; 216 #define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */ 217 #define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */ 218 219 /* 220 * per process aio data structure 221 */ 222 struct kaioinfo { 223 int kaio_flags; /* per process kaio flags */ 224 int kaio_maxactive_count; /* maximum number of AIOs */ 225 int kaio_active_count; /* number of currently used AIOs */ 226 int kaio_qallowed_count; /* maxiumu size of AIO queue */ 227 int kaio_queue_count; /* size of AIO queue */ 228 int kaio_ballowed_count; /* maximum number of buffers */ 229 int kaio_queue_finished_count; /* number of daemon jobs finished */ 230 int kaio_buffer_count; /* number of physio buffers */ 231 int kaio_buffer_finished_count; /* count of I/O done */ 232 struct proc *kaio_p; /* process that uses this kaio block */ 233 TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */ 234 TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */ 235 TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */ 236 TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */ 237 TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */ 238 TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */ 239 }; 240 241 #define KAIO_RUNDOWN 0x1 /* process is being run down */ 242 #define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */ 243 244 static TAILQ_HEAD(,aiothreadlist) aio_activeproc; /* Active daemons */ 245 static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* Idle daemons */ 246 static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */ 247 static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */ 248 249 static void aio_init_aioinfo(struct proc *p); 250 static void aio_onceonly(void); 251 static int aio_free_entry(struct aiocblist *aiocbe); 252 static void aio_process(struct aiocblist *aiocbe); 253 static int aio_newproc(void); 254 static int aio_aqueue(struct thread *td, struct aiocb *job, int type); 255 static void aio_physwakeup(struct buf *bp); 256 static void aio_proc_rundown(void *arg, struct proc *p); 257 static int aio_fphysio(struct aiocblist *aiocbe); 258 static int aio_qphysio(struct proc *p, struct aiocblist *iocb); 259 static void aio_daemon(void *uproc); 260 static void aio_swake_cb(struct socket *, struct sockbuf *); 261 static int aio_unload(void); 262 static void process_signal(void *aioj); 263 static int filt_aioattach(struct knote *kn); 264 static void filt_aiodetach(struct knote *kn); 265 static int filt_aio(struct knote *kn, long hint); 266 267 /* 268 * Zones for: 269 * kaio Per process async io info 270 * aiop async io thread data 271 * aiocb async io jobs 272 * aiol list io job pointer - internal to aio_suspend XXX 273 * aiolio list io jobs 274 */ 275 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone; 276 277 /* kqueue filters for aio */ 278 static struct filterops aio_filtops = 279 { 0, filt_aioattach, filt_aiodetach, filt_aio }; 280 281 static eventhandler_tag exit_tag, exec_tag; 282 283 /* 284 * Main operations function for use as a kernel module. 285 */ 286 static int 287 aio_modload(struct module *module, int cmd, void *arg) 288 { 289 int error = 0; 290 291 switch (cmd) { 292 case MOD_LOAD: 293 aio_onceonly(); 294 break; 295 case MOD_UNLOAD: 296 error = aio_unload(); 297 break; 298 case MOD_SHUTDOWN: 299 break; 300 default: 301 error = EINVAL; 302 break; 303 } 304 return (error); 305 } 306 307 static moduledata_t aio_mod = { 308 "aio", 309 &aio_modload, 310 NULL 311 }; 312 313 SYSCALL_MODULE_HELPER(aio_return); 314 SYSCALL_MODULE_HELPER(aio_suspend); 315 SYSCALL_MODULE_HELPER(aio_cancel); 316 SYSCALL_MODULE_HELPER(aio_error); 317 SYSCALL_MODULE_HELPER(aio_read); 318 SYSCALL_MODULE_HELPER(aio_write); 319 SYSCALL_MODULE_HELPER(aio_waitcomplete); 320 SYSCALL_MODULE_HELPER(lio_listio); 321 322 DECLARE_MODULE(aio, aio_mod, 323 SI_SUB_VFS, SI_ORDER_ANY); 324 MODULE_VERSION(aio, 1); 325 326 /* 327 * Startup initialization 328 */ 329 static void 330 aio_onceonly(void) 331 { 332 333 /* XXX: should probably just use so->callback */ 334 aio_swake = &aio_swake_cb; 335 exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL, 336 EVENTHANDLER_PRI_ANY); 337 exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown, NULL, 338 EVENTHANDLER_PRI_ANY); 339 kqueue_add_filteropts(EVFILT_AIO, &aio_filtops); 340 TAILQ_INIT(&aio_freeproc); 341 TAILQ_INIT(&aio_activeproc); 342 TAILQ_INIT(&aio_jobs); 343 TAILQ_INIT(&aio_bufjobs); 344 kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL, 345 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 346 aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL, 347 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 348 aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL, 349 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 350 aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL, 351 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 352 aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aio_liojob), NULL, 353 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 354 aiod_timeout = AIOD_TIMEOUT_DEFAULT; 355 aiod_lifetime = AIOD_LIFETIME_DEFAULT; 356 jobrefid = 1; 357 async_io_version = _POSIX_VERSION; 358 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX); 359 p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE); 360 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0); 361 } 362 363 /* 364 * Callback for unload of AIO when used as a module. 365 */ 366 static int 367 aio_unload(void) 368 { 369 370 /* 371 * XXX: no unloads by default, it's too dangerous. 372 * perhaps we could do it if locked out callers and then 373 * did an aio_proc_rundown() on each process. 374 */ 375 if (!unloadable) 376 return (EOPNOTSUPP); 377 378 async_io_version = 0; 379 aio_swake = NULL; 380 EVENTHANDLER_DEREGISTER(process_exit, exit_tag); 381 EVENTHANDLER_DEREGISTER(process_exec, exec_tag); 382 kqueue_del_filteropts(EVFILT_AIO); 383 p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1); 384 p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1); 385 p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1); 386 return (0); 387 } 388 389 /* 390 * Init the per-process aioinfo structure. The aioinfo limits are set 391 * per-process for user limit (resource) management. 392 */ 393 static void 394 aio_init_aioinfo(struct proc *p) 395 { 396 struct kaioinfo *ki; 397 398 if (p->p_aioinfo == NULL) { 399 ki = uma_zalloc(kaio_zone, M_WAITOK); 400 p->p_aioinfo = ki; 401 ki->kaio_flags = 0; 402 ki->kaio_maxactive_count = max_aio_per_proc; 403 ki->kaio_active_count = 0; 404 ki->kaio_qallowed_count = max_aio_queue_per_proc; 405 ki->kaio_queue_count = 0; 406 ki->kaio_ballowed_count = max_buf_aio; 407 ki->kaio_buffer_count = 0; 408 ki->kaio_buffer_finished_count = 0; 409 ki->kaio_p = p; 410 TAILQ_INIT(&ki->kaio_jobdone); 411 TAILQ_INIT(&ki->kaio_jobqueue); 412 TAILQ_INIT(&ki->kaio_bufdone); 413 TAILQ_INIT(&ki->kaio_bufqueue); 414 TAILQ_INIT(&ki->kaio_liojoblist); 415 TAILQ_INIT(&ki->kaio_sockqueue); 416 } 417 418 while (num_aio_procs < target_aio_procs) 419 aio_newproc(); 420 } 421 422 /* 423 * Free a job entry. Wait for completion if it is currently active, but don't 424 * delay forever. If we delay, we return a flag that says that we have to 425 * restart the queue scan. 426 */ 427 static int 428 aio_free_entry(struct aiocblist *aiocbe) 429 { 430 struct kaioinfo *ki; 431 struct aio_liojob *lj; 432 struct proc *p; 433 int error; 434 int s; 435 436 if (aiocbe->jobstate == JOBST_NULL) 437 panic("aio_free_entry: freeing already free job"); 438 439 p = aiocbe->userproc; 440 ki = p->p_aioinfo; 441 lj = aiocbe->lio; 442 if (ki == NULL) 443 panic("aio_free_entry: missing p->p_aioinfo"); 444 445 while (aiocbe->jobstate == JOBST_JOBRUNNING) { 446 aiocbe->jobflags |= AIOCBLIST_RUNDOWN; 447 tsleep(aiocbe, PRIBIO, "jobwai", 0); 448 } 449 if (aiocbe->bp == NULL) { 450 if (ki->kaio_queue_count <= 0) 451 panic("aio_free_entry: process queue size <= 0"); 452 if (num_queue_count <= 0) 453 panic("aio_free_entry: system wide queue size <= 0"); 454 455 if (lj) { 456 lj->lioj_queue_count--; 457 if (aiocbe->jobflags & AIOCBLIST_DONE) 458 lj->lioj_queue_finished_count--; 459 } 460 ki->kaio_queue_count--; 461 if (aiocbe->jobflags & AIOCBLIST_DONE) 462 ki->kaio_queue_finished_count--; 463 num_queue_count--; 464 } else { 465 if (lj) { 466 lj->lioj_buffer_count--; 467 if (aiocbe->jobflags & AIOCBLIST_DONE) 468 lj->lioj_buffer_finished_count--; 469 } 470 if (aiocbe->jobflags & AIOCBLIST_DONE) 471 ki->kaio_buffer_finished_count--; 472 ki->kaio_buffer_count--; 473 num_buf_aio--; 474 } 475 476 /* aiocbe is going away, we need to destroy any knotes */ 477 /* XXXKSE Note the thread here is used to eventually find the 478 * owning process again, but it is also used to do a fo_close 479 * and that requires the thread. (but does it require the 480 * OWNING thread? (or maybe the running thread?) 481 * There is a semantic problem here... 482 */ 483 knote_remove(FIRST_THREAD_IN_PROC(p), &aiocbe->klist); /* XXXKSE */ 484 485 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags & KAIO_RUNDOWN) 486 && ((ki->kaio_buffer_count == 0) && (ki->kaio_queue_count == 0)))) { 487 ki->kaio_flags &= ~KAIO_WAKEUP; 488 wakeup(p); 489 } 490 491 if (aiocbe->jobstate == JOBST_JOBQBUF) { 492 if ((error = aio_fphysio(aiocbe)) != 0) 493 return (error); 494 if (aiocbe->jobstate != JOBST_JOBBFINISHED) 495 panic("aio_free_entry: invalid physio finish-up state"); 496 s = splbio(); 497 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 498 splx(s); 499 } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) { 500 s = splnet(); 501 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 502 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 503 splx(s); 504 } else if (aiocbe->jobstate == JOBST_JOBFINISHED) 505 TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist); 506 else if (aiocbe->jobstate == JOBST_JOBBFINISHED) { 507 s = splbio(); 508 TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist); 509 splx(s); 510 if (aiocbe->bp) { 511 vunmapbuf(aiocbe->bp); 512 relpbuf(aiocbe->bp, NULL); 513 aiocbe->bp = NULL; 514 } 515 } 516 if (lj && (lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 0)) { 517 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 518 uma_zfree(aiolio_zone, lj); 519 } 520 aiocbe->jobstate = JOBST_NULL; 521 untimeout(process_signal, aiocbe, aiocbe->timeouthandle); 522 fdrop(aiocbe->fd_file, curthread); 523 crfree(aiocbe->cred); 524 uma_zfree(aiocb_zone, aiocbe); 525 return (0); 526 } 527 528 /* 529 * Rundown the jobs for a given process. 530 */ 531 static void 532 aio_proc_rundown(void *arg, struct proc *p) 533 { 534 int s; 535 struct kaioinfo *ki; 536 struct aio_liojob *lj, *ljn; 537 struct aiocblist *aiocbe, *aiocbn; 538 struct file *fp; 539 struct socket *so; 540 541 ki = p->p_aioinfo; 542 if (ki == NULL) 543 return; 544 545 ki->kaio_flags |= LIOJ_SIGNAL_POSTED; 546 while ((ki->kaio_active_count > 0) || (ki->kaio_buffer_count > 547 ki->kaio_buffer_finished_count)) { 548 ki->kaio_flags |= KAIO_RUNDOWN; 549 if (tsleep(p, PRIBIO, "kaiowt", aiod_timeout)) 550 break; 551 } 552 553 /* 554 * Move any aio ops that are waiting on socket I/O to the normal job 555 * queues so they are cleaned up with any others. 556 */ 557 s = splnet(); 558 for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe = 559 aiocbn) { 560 aiocbn = TAILQ_NEXT(aiocbe, plist); 561 fp = aiocbe->fd_file; 562 if (fp != NULL) { 563 so = fp->f_data; 564 TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list); 565 if (TAILQ_EMPTY(&so->so_aiojobq)) { 566 so->so_snd.sb_flags &= ~SB_AIO; 567 so->so_rcv.sb_flags &= ~SB_AIO; 568 } 569 } 570 TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist); 571 TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list); 572 TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist); 573 } 574 splx(s); 575 576 restart1: 577 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobdone); aiocbe; aiocbe = aiocbn) { 578 aiocbn = TAILQ_NEXT(aiocbe, plist); 579 if (aio_free_entry(aiocbe)) 580 goto restart1; 581 } 582 583 restart2: 584 for (aiocbe = TAILQ_FIRST(&ki->kaio_jobqueue); aiocbe; aiocbe = 585 aiocbn) { 586 aiocbn = TAILQ_NEXT(aiocbe, plist); 587 if (aio_free_entry(aiocbe)) 588 goto restart2; 589 } 590 591 /* 592 * Note the use of lots of splbio here, trying to avoid splbio for long chains 593 * of I/O. Probably unnecessary. 594 */ 595 restart3: 596 s = splbio(); 597 while (TAILQ_FIRST(&ki->kaio_bufqueue)) { 598 ki->kaio_flags |= KAIO_WAKEUP; 599 tsleep(p, PRIBIO, "aioprn", 0); 600 splx(s); 601 goto restart3; 602 } 603 splx(s); 604 605 restart4: 606 s = splbio(); 607 for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) { 608 aiocbn = TAILQ_NEXT(aiocbe, plist); 609 if (aio_free_entry(aiocbe)) { 610 splx(s); 611 goto restart4; 612 } 613 } 614 splx(s); 615 616 /* 617 * If we've slept, jobs might have moved from one queue to another. 618 * Retry rundown if we didn't manage to empty the queues. 619 */ 620 if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL || 621 TAILQ_FIRST(&ki->kaio_jobqueue) != NULL || 622 TAILQ_FIRST(&ki->kaio_bufqueue) != NULL || 623 TAILQ_FIRST(&ki->kaio_bufdone) != NULL) 624 goto restart1; 625 626 for (lj = TAILQ_FIRST(&ki->kaio_liojoblist); lj; lj = ljn) { 627 ljn = TAILQ_NEXT(lj, lioj_list); 628 if ((lj->lioj_buffer_count == 0) && (lj->lioj_queue_count == 629 0)) { 630 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list); 631 uma_zfree(aiolio_zone, lj); 632 } else { 633 #ifdef DIAGNOSTIC 634 printf("LIO job not cleaned up: B:%d, BF:%d, Q:%d, " 635 "QF:%d\n", lj->lioj_buffer_count, 636 lj->lioj_buffer_finished_count, 637 lj->lioj_queue_count, 638 lj->lioj_queue_finished_count); 639 #endif 640 } 641 } 642 643 uma_zfree(kaio_zone, ki); 644 p->p_aioinfo = NULL; 645 } 646 647 /* 648 * Select a job to run (called by an AIO daemon). 649 */ 650 static struct aiocblist * 651 aio_selectjob(struct aiothreadlist *aiop) 652 { 653 int s; 654 struct aiocblist *aiocbe; 655 struct kaioinfo *ki; 656 struct proc *userp; 657 658 s = splnet(); 659 for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe = 660 TAILQ_NEXT(aiocbe, list)) { 661 userp = aiocbe->userproc; 662 ki = userp->p_aioinfo; 663 664 if (ki->kaio_active_count < ki->kaio_maxactive_count) { 665 TAILQ_REMOVE(&aio_jobs, aiocbe, list); 666 splx(s); 667 return (aiocbe); 668 } 669 } 670 splx(s); 671 672 return (NULL); 673 } 674 675 /* 676 * The AIO processing activity. This is the code that does the I/O request for 677 * the non-physio version of the operations. The normal vn operations are used, 678 * and this code should work in all instances for every type of file, including 679 * pipes, sockets, fifos, and regular files. 680 */ 681 static void 682 aio_process(struct aiocblist *aiocbe) 683 { 684 struct ucred *td_savedcred; 685 struct thread *td; 686 struct proc *mycp; 687 struct aiocb *cb; 688 struct file *fp; 689 struct uio auio; 690 struct iovec aiov; 691 int cnt; 692 int error; 693 int oublock_st, oublock_end; 694 int inblock_st, inblock_end; 695 696 td = curthread; 697 td_savedcred = td->td_ucred; 698 td->td_ucred = aiocbe->cred; 699 mycp = td->td_proc; 700 cb = &aiocbe->uaiocb; 701 fp = aiocbe->fd_file; 702 703 aiov.iov_base = (void *)(uintptr_t)cb->aio_buf; 704 aiov.iov_len = cb->aio_nbytes; 705 706 auio.uio_iov = &aiov; 707 auio.uio_iovcnt = 1; 708 auio.uio_offset = cb->aio_offset; 709 auio.uio_resid = cb->aio_nbytes; 710 cnt = cb->aio_nbytes; 711 auio.uio_segflg = UIO_USERSPACE; 712 auio.uio_td = td; 713 714 inblock_st = mycp->p_stats->p_ru.ru_inblock; 715 oublock_st = mycp->p_stats->p_ru.ru_oublock; 716 /* 717 * _aio_aqueue() acquires a reference to the file that is 718 * released in aio_free_entry(). 719 */ 720 if (cb->aio_lio_opcode == LIO_READ) { 721 auio.uio_rw = UIO_READ; 722 error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td); 723 } else { 724 auio.uio_rw = UIO_WRITE; 725 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td); 726 } 727 inblock_end = mycp->p_stats->p_ru.ru_inblock; 728 oublock_end = mycp->p_stats->p_ru.ru_oublock; 729 730 aiocbe->inputcharge = inblock_end - inblock_st; 731 aiocbe->outputcharge = oublock_end - oublock_st; 732 733 if ((error) && (auio.uio_resid != cnt)) { 734 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK) 735 error = 0; 736 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) { 737 PROC_LOCK(aiocbe->userproc); 738 psignal(aiocbe->userproc, SIGPIPE); 739 PROC_UNLOCK(aiocbe->userproc); 740 } 741 } 742 743 cnt -= auio.uio_resid; 744 cb->_aiocb_private.error = error; 745 cb->_aiocb_private.status = cnt; 746 td->td_ucred = td_savedcred; 747 } 748 749 /* 750 * The AIO daemon, most of the actual work is done in aio_process, 751 * but the setup (and address space mgmt) is done in this routine. 752 */ 753 static void 754 aio_daemon(void *uproc) 755 { 756 int s; 757 struct aio_liojob *lj; 758 struct aiocb *cb; 759 struct aiocblist *aiocbe; 760 struct aiothreadlist *aiop; 761 struct kaioinfo *ki; 762 struct proc *curcp, *mycp, *userp; 763 struct vmspace *myvm, *tmpvm; 764 struct thread *td = curthread; 765 struct pgrp *newpgrp; 766 struct session *newsess; 767 768 mtx_lock(&Giant); 769 /* 770 * Local copies of curproc (cp) and vmspace (myvm) 771 */ 772 mycp = td->td_proc; 773 myvm = mycp->p_vmspace; 774 775 KASSERT(mycp->p_textvp == NULL, ("kthread has a textvp")); 776 777 /* 778 * Allocate and ready the aio control info. There is one aiop structure 779 * per daemon. 780 */ 781 aiop = uma_zalloc(aiop_zone, M_WAITOK); 782 aiop->aiothread = td; 783 aiop->aiothreadflags |= AIOP_FREE; 784 785 s = splnet(); 786 787 /* 788 * Place thread (lightweight process) onto the AIO free thread list. 789 */ 790 if (TAILQ_EMPTY(&aio_freeproc)) 791 wakeup(&aio_freeproc); 792 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 793 794 splx(s); 795 796 /* 797 * Get rid of our current filedescriptors. AIOD's don't need any 798 * filedescriptors, except as temporarily inherited from the client. 799 */ 800 fdfree(td); 801 802 mtx_unlock(&Giant); 803 /* The daemon resides in its own pgrp. */ 804 MALLOC(newpgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP, 805 M_WAITOK | M_ZERO); 806 MALLOC(newsess, struct session *, sizeof(struct session), M_SESSION, 807 M_WAITOK | M_ZERO); 808 809 sx_xlock(&proctree_lock); 810 enterpgrp(mycp, mycp->p_pid, newpgrp, newsess); 811 sx_xunlock(&proctree_lock); 812 mtx_lock(&Giant); 813 814 /* 815 * Wakeup parent process. (Parent sleeps to keep from blasting away 816 * and creating too many daemons.) 817 */ 818 wakeup(mycp); 819 820 for (;;) { 821 /* 822 * curcp is the current daemon process context. 823 * userp is the current user process context. 824 */ 825 curcp = mycp; 826 827 /* 828 * Take daemon off of free queue 829 */ 830 if (aiop->aiothreadflags & AIOP_FREE) { 831 s = splnet(); 832 TAILQ_REMOVE(&aio_freeproc, aiop, list); 833 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 834 aiop->aiothreadflags &= ~AIOP_FREE; 835 splx(s); 836 } 837 aiop->aiothreadflags &= ~AIOP_SCHED; 838 839 /* 840 * Check for jobs. 841 */ 842 while ((aiocbe = aio_selectjob(aiop)) != NULL) { 843 cb = &aiocbe->uaiocb; 844 userp = aiocbe->userproc; 845 846 aiocbe->jobstate = JOBST_JOBRUNNING; 847 848 /* 849 * Connect to process address space for user program. 850 */ 851 if (userp != curcp) { 852 /* 853 * Save the current address space that we are 854 * connected to. 855 */ 856 tmpvm = mycp->p_vmspace; 857 858 /* 859 * Point to the new user address space, and 860 * refer to it. 861 */ 862 mycp->p_vmspace = userp->p_vmspace; 863 mycp->p_vmspace->vm_refcnt++; 864 865 /* Activate the new mapping. */ 866 pmap_activate(FIRST_THREAD_IN_PROC(mycp)); 867 868 /* 869 * If the old address space wasn't the daemons 870 * own address space, then we need to remove the 871 * daemon's reference from the other process 872 * that it was acting on behalf of. 873 */ 874 if (tmpvm != myvm) { 875 vmspace_free(tmpvm); 876 } 877 curcp = userp; 878 } 879 880 ki = userp->p_aioinfo; 881 lj = aiocbe->lio; 882 883 /* Account for currently active jobs. */ 884 ki->kaio_active_count++; 885 886 /* Do the I/O function. */ 887 aio_process(aiocbe); 888 889 /* Decrement the active job count. */ 890 ki->kaio_active_count--; 891 892 /* 893 * Increment the completion count for wakeup/signal 894 * comparisons. 895 */ 896 aiocbe->jobflags |= AIOCBLIST_DONE; 897 ki->kaio_queue_finished_count++; 898 if (lj) 899 lj->lioj_queue_finished_count++; 900 if ((ki->kaio_flags & KAIO_WAKEUP) || ((ki->kaio_flags 901 & KAIO_RUNDOWN) && (ki->kaio_active_count == 0))) { 902 ki->kaio_flags &= ~KAIO_WAKEUP; 903 wakeup(userp); 904 } 905 906 s = splbio(); 907 if (lj && (lj->lioj_flags & 908 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == LIOJ_SIGNAL) { 909 if ((lj->lioj_queue_finished_count == 910 lj->lioj_queue_count) && 911 (lj->lioj_buffer_finished_count == 912 lj->lioj_buffer_count)) { 913 PROC_LOCK(userp); 914 psignal(userp, 915 lj->lioj_signal.sigev_signo); 916 PROC_UNLOCK(userp); 917 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 918 } 919 } 920 splx(s); 921 922 aiocbe->jobstate = JOBST_JOBFINISHED; 923 924 s = splnet(); 925 TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist); 926 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist); 927 splx(s); 928 KNOTE(&aiocbe->klist, 0); 929 930 if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) { 931 wakeup(aiocbe); 932 aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN; 933 } 934 935 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 936 PROC_LOCK(userp); 937 psignal(userp, cb->aio_sigevent.sigev_signo); 938 PROC_UNLOCK(userp); 939 } 940 } 941 942 /* 943 * Disconnect from user address space. 944 */ 945 if (curcp != mycp) { 946 /* Get the user address space to disconnect from. */ 947 tmpvm = mycp->p_vmspace; 948 949 /* Get original address space for daemon. */ 950 mycp->p_vmspace = myvm; 951 952 /* Activate the daemon's address space. */ 953 pmap_activate(FIRST_THREAD_IN_PROC(mycp)); 954 #ifdef DIAGNOSTIC 955 if (tmpvm == myvm) { 956 printf("AIOD: vmspace problem -- %d\n", 957 mycp->p_pid); 958 } 959 #endif 960 /* Remove our vmspace reference. */ 961 vmspace_free(tmpvm); 962 963 curcp = mycp; 964 } 965 966 /* 967 * If we are the first to be put onto the free queue, wakeup 968 * anyone waiting for a daemon. 969 */ 970 s = splnet(); 971 TAILQ_REMOVE(&aio_activeproc, aiop, list); 972 if (TAILQ_EMPTY(&aio_freeproc)) 973 wakeup(&aio_freeproc); 974 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list); 975 aiop->aiothreadflags |= AIOP_FREE; 976 splx(s); 977 978 /* 979 * If daemon is inactive for a long time, allow it to exit, 980 * thereby freeing resources. 981 */ 982 if ((aiop->aiothreadflags & AIOP_SCHED) == 0 && 983 tsleep(aiop->aiothread, PRIBIO, "aiordy", aiod_lifetime)) { 984 s = splnet(); 985 if (TAILQ_EMPTY(&aio_jobs)) { 986 if ((aiop->aiothreadflags & AIOP_FREE) && 987 (num_aio_procs > target_aio_procs)) { 988 TAILQ_REMOVE(&aio_freeproc, aiop, list); 989 splx(s); 990 uma_zfree(aiop_zone, aiop); 991 num_aio_procs--; 992 #ifdef DIAGNOSTIC 993 if (mycp->p_vmspace->vm_refcnt <= 1) { 994 printf("AIOD: bad vm refcnt for" 995 " exiting daemon: %d\n", 996 mycp->p_vmspace->vm_refcnt); 997 } 998 #endif 999 kthread_exit(0); 1000 } 1001 } 1002 splx(s); 1003 } 1004 } 1005 } 1006 1007 /* 1008 * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The 1009 * AIO daemon modifies its environment itself. 1010 */ 1011 static int 1012 aio_newproc(void) 1013 { 1014 int error; 1015 struct proc *p; 1016 1017 error = kthread_create(aio_daemon, curproc, &p, RFNOWAIT, 0, "aiod%d", 1018 num_aio_procs); 1019 if (error) 1020 return (error); 1021 1022 /* 1023 * Wait until daemon is started, but continue on just in case to 1024 * handle error conditions. 1025 */ 1026 error = tsleep(p, PZERO, "aiosta", aiod_timeout); 1027 1028 num_aio_procs++; 1029 1030 return (error); 1031 } 1032 1033 /* 1034 * Try the high-performance, low-overhead physio method for eligible 1035 * VCHR devices. This method doesn't use an aio helper thread, and 1036 * thus has very low overhead. 1037 * 1038 * Assumes that the caller, _aio_aqueue(), has incremented the file 1039 * structure's reference count, preventing its deallocation for the 1040 * duration of this call. 1041 */ 1042 static int 1043 aio_qphysio(struct proc *p, struct aiocblist *aiocbe) 1044 { 1045 int error; 1046 struct aiocb *cb; 1047 struct file *fp; 1048 struct buf *bp; 1049 struct vnode *vp; 1050 struct kaioinfo *ki; 1051 struct aio_liojob *lj; 1052 int s; 1053 int notify; 1054 1055 cb = &aiocbe->uaiocb; 1056 fp = aiocbe->fd_file; 1057 1058 if (fp->f_type != DTYPE_VNODE) 1059 return (-1); 1060 1061 vp = fp->f_data; 1062 1063 /* 1064 * If its not a disk, we don't want to return a positive error. 1065 * It causes the aio code to not fall through to try the thread 1066 * way when you're talking to a regular file. 1067 */ 1068 if (!vn_isdisk(vp, &error)) { 1069 if (error == ENOTBLK) 1070 return (-1); 1071 else 1072 return (error); 1073 } 1074 1075 if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys) 1076 return (-1); 1077 1078 if (cb->aio_nbytes > 1079 MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK)) 1080 return (-1); 1081 1082 ki = p->p_aioinfo; 1083 if (ki->kaio_buffer_count >= ki->kaio_ballowed_count) 1084 return (-1); 1085 1086 ki->kaio_buffer_count++; 1087 1088 lj = aiocbe->lio; 1089 if (lj) 1090 lj->lioj_buffer_count++; 1091 1092 /* Create and build a buffer header for a transfer. */ 1093 bp = (struct buf *)getpbuf(NULL); 1094 BUF_KERNPROC(bp); 1095 1096 /* 1097 * Get a copy of the kva from the physical buffer. 1098 */ 1099 bp->b_caller1 = p; 1100 bp->b_dev = vp->v_rdev; 1101 error = 0; 1102 1103 bp->b_bcount = cb->aio_nbytes; 1104 bp->b_bufsize = cb->aio_nbytes; 1105 bp->b_flags = B_PHYS; 1106 bp->b_iodone = aio_physwakeup; 1107 bp->b_saveaddr = bp->b_data; 1108 bp->b_data = (void *)(uintptr_t)cb->aio_buf; 1109 bp->b_blkno = btodb(cb->aio_offset); 1110 bp->b_iocmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ; 1111 1112 /* 1113 * Bring buffer into kernel space. 1114 */ 1115 if (vmapbuf(bp) < 0) { 1116 error = EFAULT; 1117 goto doerror; 1118 } 1119 1120 s = splbio(); 1121 aiocbe->bp = bp; 1122 bp->b_spc = (void *)aiocbe; 1123 TAILQ_INSERT_TAIL(&aio_bufjobs, aiocbe, list); 1124 TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist); 1125 aiocbe->jobstate = JOBST_JOBQBUF; 1126 cb->_aiocb_private.status = cb->aio_nbytes; 1127 num_buf_aio++; 1128 bp->b_error = 0; 1129 1130 splx(s); 1131 1132 /* Perform transfer. */ 1133 DEV_STRATEGY(bp); 1134 1135 notify = 0; 1136 s = splbio(); 1137 1138 /* 1139 * If we had an error invoking the request, or an error in processing 1140 * the request before we have returned, we process it as an error in 1141 * transfer. Note that such an I/O error is not indicated immediately, 1142 * but is returned using the aio_error mechanism. In this case, 1143 * aio_suspend will return immediately. 1144 */ 1145 if (bp->b_error || (bp->b_ioflags & BIO_ERROR)) { 1146 struct aiocb *job = aiocbe->uuaiocb; 1147 1148 aiocbe->uaiocb._aiocb_private.status = 0; 1149 suword(&job->_aiocb_private.status, 0); 1150 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 1151 suword(&job->_aiocb_private.error, bp->b_error); 1152 1153 ki->kaio_buffer_finished_count++; 1154 1155 if (aiocbe->jobstate != JOBST_JOBBFINISHED) { 1156 aiocbe->jobstate = JOBST_JOBBFINISHED; 1157 aiocbe->jobflags |= AIOCBLIST_DONE; 1158 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 1159 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 1160 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 1161 notify = 1; 1162 } 1163 } 1164 splx(s); 1165 if (notify) 1166 KNOTE(&aiocbe->klist, 0); 1167 return (0); 1168 1169 doerror: 1170 ki->kaio_buffer_count--; 1171 if (lj) 1172 lj->lioj_buffer_count--; 1173 aiocbe->bp = NULL; 1174 relpbuf(bp, NULL); 1175 return (error); 1176 } 1177 1178 /* 1179 * This waits/tests physio completion. 1180 */ 1181 static int 1182 aio_fphysio(struct aiocblist *iocb) 1183 { 1184 int s; 1185 struct buf *bp; 1186 int error; 1187 1188 bp = iocb->bp; 1189 1190 s = splbio(); 1191 while ((bp->b_flags & B_DONE) == 0) { 1192 if (tsleep(bp, PRIBIO, "physstr", aiod_timeout)) { 1193 if ((bp->b_flags & B_DONE) == 0) { 1194 splx(s); 1195 return (EINPROGRESS); 1196 } else 1197 break; 1198 } 1199 } 1200 splx(s); 1201 1202 /* Release mapping into kernel space. */ 1203 vunmapbuf(bp); 1204 iocb->bp = 0; 1205 1206 error = 0; 1207 1208 /* Check for an error. */ 1209 if (bp->b_ioflags & BIO_ERROR) 1210 error = bp->b_error; 1211 1212 relpbuf(bp, NULL); 1213 return (error); 1214 } 1215 1216 /* 1217 * Wake up aio requests that may be serviceable now. 1218 */ 1219 static void 1220 aio_swake_cb(struct socket *so, struct sockbuf *sb) 1221 { 1222 struct aiocblist *cb,*cbn; 1223 struct proc *p; 1224 struct kaioinfo *ki = NULL; 1225 int opcode, wakecount = 0; 1226 struct aiothreadlist *aiop; 1227 1228 if (sb == &so->so_snd) { 1229 opcode = LIO_WRITE; 1230 so->so_snd.sb_flags &= ~SB_AIO; 1231 } else { 1232 opcode = LIO_READ; 1233 so->so_rcv.sb_flags &= ~SB_AIO; 1234 } 1235 1236 for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) { 1237 cbn = TAILQ_NEXT(cb, list); 1238 if (opcode == cb->uaiocb.aio_lio_opcode) { 1239 p = cb->userproc; 1240 ki = p->p_aioinfo; 1241 TAILQ_REMOVE(&so->so_aiojobq, cb, list); 1242 TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist); 1243 TAILQ_INSERT_TAIL(&aio_jobs, cb, list); 1244 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist); 1245 wakecount++; 1246 if (cb->jobstate != JOBST_JOBQGLOBAL) 1247 panic("invalid queue value"); 1248 } 1249 } 1250 1251 while (wakecount--) { 1252 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) { 1253 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1254 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1255 aiop->aiothreadflags &= ~AIOP_FREE; 1256 wakeup(aiop->aiothread); 1257 } 1258 } 1259 } 1260 1261 /* 1262 * Queue a new AIO request. Choosing either the threaded or direct physio VCHR 1263 * technique is done in this code. 1264 */ 1265 static int 1266 _aio_aqueue(struct thread *td, struct aiocb *job, struct aio_liojob *lj, int type) 1267 { 1268 struct proc *p = td->td_proc; 1269 struct filedesc *fdp; 1270 struct file *fp; 1271 unsigned int fd; 1272 struct socket *so; 1273 int s; 1274 int error; 1275 int opcode, user_opcode; 1276 struct aiocblist *aiocbe; 1277 struct aiothreadlist *aiop; 1278 struct kaioinfo *ki; 1279 struct kevent kev; 1280 struct kqueue *kq; 1281 struct file *kq_fp; 1282 1283 aiocbe = uma_zalloc(aiocb_zone, M_WAITOK); 1284 aiocbe->inputcharge = 0; 1285 aiocbe->outputcharge = 0; 1286 callout_handle_init(&aiocbe->timeouthandle); 1287 SLIST_INIT(&aiocbe->klist); 1288 1289 suword(&job->_aiocb_private.status, -1); 1290 suword(&job->_aiocb_private.error, 0); 1291 suword(&job->_aiocb_private.kernelinfo, -1); 1292 1293 error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb)); 1294 if (error) { 1295 suword(&job->_aiocb_private.error, error); 1296 uma_zfree(aiocb_zone, aiocbe); 1297 return (error); 1298 } 1299 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL && 1300 !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) { 1301 uma_zfree(aiocb_zone, aiocbe); 1302 return (EINVAL); 1303 } 1304 1305 /* Save userspace address of the job info. */ 1306 aiocbe->uuaiocb = job; 1307 1308 /* Get the opcode. */ 1309 user_opcode = aiocbe->uaiocb.aio_lio_opcode; 1310 if (type != LIO_NOP) 1311 aiocbe->uaiocb.aio_lio_opcode = type; 1312 opcode = aiocbe->uaiocb.aio_lio_opcode; 1313 1314 /* Get the fd info for process. */ 1315 fdp = p->p_fd; 1316 1317 /* 1318 * Range check file descriptor. 1319 */ 1320 FILEDESC_LOCK(fdp); 1321 fd = aiocbe->uaiocb.aio_fildes; 1322 if (fd >= fdp->fd_nfiles) { 1323 FILEDESC_UNLOCK(fdp); 1324 uma_zfree(aiocb_zone, aiocbe); 1325 if (type == 0) 1326 suword(&job->_aiocb_private.error, EBADF); 1327 return (EBADF); 1328 } 1329 1330 fp = aiocbe->fd_file = fdp->fd_ofiles[fd]; 1331 if ((fp == NULL) || ((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) == 1332 0))) { 1333 FILEDESC_UNLOCK(fdp); 1334 uma_zfree(aiocb_zone, aiocbe); 1335 if (type == 0) 1336 suword(&job->_aiocb_private.error, EBADF); 1337 return (EBADF); 1338 } 1339 fhold(fp); 1340 FILEDESC_UNLOCK(fdp); 1341 1342 if (aiocbe->uaiocb.aio_offset == -1LL) { 1343 error = EINVAL; 1344 goto aqueue_fail; 1345 } 1346 error = suword(&job->_aiocb_private.kernelinfo, jobrefid); 1347 if (error) { 1348 error = EINVAL; 1349 goto aqueue_fail; 1350 } 1351 aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid; 1352 if (jobrefid == LONG_MAX) 1353 jobrefid = 1; 1354 else 1355 jobrefid++; 1356 1357 if (opcode == LIO_NOP) { 1358 fdrop(fp, td); 1359 uma_zfree(aiocb_zone, aiocbe); 1360 if (type == 0) { 1361 suword(&job->_aiocb_private.error, 0); 1362 suword(&job->_aiocb_private.status, 0); 1363 suword(&job->_aiocb_private.kernelinfo, 0); 1364 } 1365 return (0); 1366 } 1367 if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) { 1368 if (type == 0) 1369 suword(&job->_aiocb_private.status, 0); 1370 error = EINVAL; 1371 goto aqueue_fail; 1372 } 1373 1374 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) { 1375 kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue; 1376 kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr; 1377 } 1378 else { 1379 /* 1380 * This method for requesting kevent-based notification won't 1381 * work on the alpha, since we're passing in a pointer 1382 * via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT- 1383 * based method instead. 1384 */ 1385 if (user_opcode == LIO_NOP || user_opcode == LIO_READ || 1386 user_opcode == LIO_WRITE) 1387 goto no_kqueue; 1388 1389 error = copyin((struct kevent *)(uintptr_t)user_opcode, 1390 &kev, sizeof(kev)); 1391 if (error) 1392 goto aqueue_fail; 1393 } 1394 if ((u_int)kev.ident >= fdp->fd_nfiles || 1395 (kq_fp = fdp->fd_ofiles[kev.ident]) == NULL || 1396 (kq_fp->f_type != DTYPE_KQUEUE)) { 1397 error = EBADF; 1398 goto aqueue_fail; 1399 } 1400 kq = kq_fp->f_data; 1401 kev.ident = (uintptr_t)aiocbe->uuaiocb; 1402 kev.filter = EVFILT_AIO; 1403 kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1; 1404 kev.data = (intptr_t)aiocbe; 1405 error = kqueue_register(kq, &kev, td); 1406 aqueue_fail: 1407 if (error) { 1408 fdrop(fp, td); 1409 uma_zfree(aiocb_zone, aiocbe); 1410 if (type == 0) 1411 suword(&job->_aiocb_private.error, error); 1412 goto done; 1413 } 1414 no_kqueue: 1415 1416 suword(&job->_aiocb_private.error, EINPROGRESS); 1417 aiocbe->uaiocb._aiocb_private.error = EINPROGRESS; 1418 aiocbe->userproc = p; 1419 aiocbe->cred = crhold(td->td_ucred); 1420 aiocbe->jobflags = 0; 1421 aiocbe->lio = lj; 1422 ki = p->p_aioinfo; 1423 1424 if (fp->f_type == DTYPE_SOCKET) { 1425 /* 1426 * Alternate queueing for socket ops: Reach down into the 1427 * descriptor to get the socket data. Then check to see if the 1428 * socket is ready to be read or written (based on the requested 1429 * operation). 1430 * 1431 * If it is not ready for io, then queue the aiocbe on the 1432 * socket, and set the flags so we get a call when sbnotify() 1433 * happens. 1434 */ 1435 so = fp->f_data; 1436 s = splnet(); 1437 if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode == 1438 LIO_WRITE) && (!sowriteable(so)))) { 1439 TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list); 1440 TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist); 1441 if (opcode == LIO_READ) 1442 so->so_rcv.sb_flags |= SB_AIO; 1443 else 1444 so->so_snd.sb_flags |= SB_AIO; 1445 aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */ 1446 ki->kaio_queue_count++; 1447 num_queue_count++; 1448 splx(s); 1449 error = 0; 1450 goto done; 1451 } 1452 splx(s); 1453 } 1454 1455 if ((error = aio_qphysio(p, aiocbe)) == 0) 1456 goto done; 1457 if (error > 0) { 1458 suword(&job->_aiocb_private.status, 0); 1459 aiocbe->uaiocb._aiocb_private.error = error; 1460 suword(&job->_aiocb_private.error, error); 1461 goto done; 1462 } 1463 1464 /* No buffer for daemon I/O. */ 1465 aiocbe->bp = NULL; 1466 1467 ki->kaio_queue_count++; 1468 if (lj) 1469 lj->lioj_queue_count++; 1470 s = splnet(); 1471 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist); 1472 TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list); 1473 splx(s); 1474 aiocbe->jobstate = JOBST_JOBQGLOBAL; 1475 1476 num_queue_count++; 1477 error = 0; 1478 1479 /* 1480 * If we don't have a free AIO process, and we are below our quota, then 1481 * start one. Otherwise, depend on the subsequent I/O completions to 1482 * pick-up this job. If we don't sucessfully create the new process 1483 * (thread) due to resource issues, we return an error for now (EAGAIN), 1484 * which is likely not the correct thing to do. 1485 */ 1486 s = splnet(); 1487 retryproc: 1488 if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) { 1489 TAILQ_REMOVE(&aio_freeproc, aiop, list); 1490 TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list); 1491 aiop->aiothreadflags &= ~AIOP_FREE; 1492 wakeup(aiop->aiothread); 1493 } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) && 1494 ((ki->kaio_active_count + num_aio_resv_start) < 1495 ki->kaio_maxactive_count)) { 1496 num_aio_resv_start++; 1497 if ((error = aio_newproc()) == 0) { 1498 num_aio_resv_start--; 1499 goto retryproc; 1500 } 1501 num_aio_resv_start--; 1502 } 1503 splx(s); 1504 done: 1505 return (error); 1506 } 1507 1508 /* 1509 * This routine queues an AIO request, checking for quotas. 1510 */ 1511 static int 1512 aio_aqueue(struct thread *td, struct aiocb *job, int type) 1513 { 1514 struct proc *p = td->td_proc; 1515 struct kaioinfo *ki; 1516 1517 if (p->p_aioinfo == NULL) 1518 aio_init_aioinfo(p); 1519 1520 if (num_queue_count >= max_queue_count) 1521 return (EAGAIN); 1522 1523 ki = p->p_aioinfo; 1524 if (ki->kaio_queue_count >= ki->kaio_qallowed_count) 1525 return (EAGAIN); 1526 1527 return _aio_aqueue(td, job, NULL, type); 1528 } 1529 1530 /* 1531 * Support the aio_return system call, as a side-effect, kernel resources are 1532 * released. 1533 */ 1534 int 1535 aio_return(struct thread *td, struct aio_return_args *uap) 1536 { 1537 struct proc *p = td->td_proc; 1538 int s; 1539 long jobref; 1540 struct aiocblist *cb, *ncb; 1541 struct aiocb *ujob; 1542 struct kaioinfo *ki; 1543 1544 ujob = uap->aiocbp; 1545 jobref = fuword(&ujob->_aiocb_private.kernelinfo); 1546 if (jobref == -1 || jobref == 0) 1547 return (EINVAL); 1548 1549 ki = p->p_aioinfo; 1550 if (ki == NULL) 1551 return (EINVAL); 1552 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1553 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) == 1554 jobref) { 1555 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 1556 p->p_stats->p_ru.ru_oublock += 1557 cb->outputcharge; 1558 cb->outputcharge = 0; 1559 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 1560 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 1561 cb->inputcharge = 0; 1562 } 1563 goto done; 1564 } 1565 } 1566 s = splbio(); 1567 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) { 1568 ncb = TAILQ_NEXT(cb, plist); 1569 if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) 1570 == jobref) { 1571 break; 1572 } 1573 } 1574 splx(s); 1575 done: 1576 if (cb != NULL) { 1577 if (ujob == cb->uuaiocb) { 1578 td->td_retval[0] = 1579 cb->uaiocb._aiocb_private.status; 1580 } else 1581 td->td_retval[0] = EFAULT; 1582 aio_free_entry(cb); 1583 return (0); 1584 } 1585 return (EINVAL); 1586 } 1587 1588 /* 1589 * Allow a process to wakeup when any of the I/O requests are completed. 1590 */ 1591 int 1592 aio_suspend(struct thread *td, struct aio_suspend_args *uap) 1593 { 1594 struct proc *p = td->td_proc; 1595 struct timeval atv; 1596 struct timespec ts; 1597 struct aiocb *const *cbptr, *cbp; 1598 struct kaioinfo *ki; 1599 struct aiocblist *cb; 1600 int i; 1601 int njoblist; 1602 int error, s, timo; 1603 long *ijoblist; 1604 struct aiocb **ujoblist; 1605 1606 if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX) 1607 return (EINVAL); 1608 1609 timo = 0; 1610 if (uap->timeout) { 1611 /* Get timespec struct. */ 1612 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) 1613 return (error); 1614 1615 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) 1616 return (EINVAL); 1617 1618 TIMESPEC_TO_TIMEVAL(&atv, &ts); 1619 if (itimerfix(&atv)) 1620 return (EINVAL); 1621 timo = tvtohz(&atv); 1622 } 1623 1624 ki = p->p_aioinfo; 1625 if (ki == NULL) 1626 return (EAGAIN); 1627 1628 njoblist = 0; 1629 ijoblist = uma_zalloc(aiol_zone, M_WAITOK); 1630 ujoblist = uma_zalloc(aiol_zone, M_WAITOK); 1631 cbptr = uap->aiocbp; 1632 1633 for (i = 0; i < uap->nent; i++) { 1634 cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1635 if (cbp == 0) 1636 continue; 1637 ujoblist[njoblist] = cbp; 1638 ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo); 1639 njoblist++; 1640 } 1641 1642 if (njoblist == 0) { 1643 uma_zfree(aiol_zone, ijoblist); 1644 uma_zfree(aiol_zone, ujoblist); 1645 return (0); 1646 } 1647 1648 error = 0; 1649 for (;;) { 1650 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1651 for (i = 0; i < njoblist; i++) { 1652 if (((intptr_t) 1653 cb->uaiocb._aiocb_private.kernelinfo) == 1654 ijoblist[i]) { 1655 if (ujoblist[i] != cb->uuaiocb) 1656 error = EINVAL; 1657 uma_zfree(aiol_zone, ijoblist); 1658 uma_zfree(aiol_zone, ujoblist); 1659 return (error); 1660 } 1661 } 1662 } 1663 1664 s = splbio(); 1665 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = 1666 TAILQ_NEXT(cb, plist)) { 1667 for (i = 0; i < njoblist; i++) { 1668 if (((intptr_t) 1669 cb->uaiocb._aiocb_private.kernelinfo) == 1670 ijoblist[i]) { 1671 splx(s); 1672 if (ujoblist[i] != cb->uuaiocb) 1673 error = EINVAL; 1674 uma_zfree(aiol_zone, ijoblist); 1675 uma_zfree(aiol_zone, ujoblist); 1676 return (error); 1677 } 1678 } 1679 } 1680 1681 ki->kaio_flags |= KAIO_WAKEUP; 1682 error = tsleep(p, PRIBIO | PCATCH, "aiospn", timo); 1683 splx(s); 1684 1685 if (error == ERESTART || error == EINTR) { 1686 uma_zfree(aiol_zone, ijoblist); 1687 uma_zfree(aiol_zone, ujoblist); 1688 return (EINTR); 1689 } else if (error == EWOULDBLOCK) { 1690 uma_zfree(aiol_zone, ijoblist); 1691 uma_zfree(aiol_zone, ujoblist); 1692 return (EAGAIN); 1693 } 1694 } 1695 1696 /* NOTREACHED */ 1697 return (EINVAL); 1698 } 1699 1700 /* 1701 * aio_cancel cancels any non-physio aio operations not currently in 1702 * progress. 1703 */ 1704 int 1705 aio_cancel(struct thread *td, struct aio_cancel_args *uap) 1706 { 1707 struct proc *p = td->td_proc; 1708 struct kaioinfo *ki; 1709 struct aiocblist *cbe, *cbn; 1710 struct file *fp; 1711 struct filedesc *fdp; 1712 struct socket *so; 1713 struct proc *po; 1714 int s,error; 1715 int cancelled=0; 1716 int notcancelled=0; 1717 struct vnode *vp; 1718 1719 fdp = p->p_fd; 1720 if ((u_int)uap->fd >= fdp->fd_nfiles || 1721 (fp = fdp->fd_ofiles[uap->fd]) == NULL) 1722 return (EBADF); 1723 1724 if (fp->f_type == DTYPE_VNODE) { 1725 vp = fp->f_data; 1726 1727 if (vn_isdisk(vp,&error)) { 1728 td->td_retval[0] = AIO_NOTCANCELED; 1729 return (0); 1730 } 1731 } else if (fp->f_type == DTYPE_SOCKET) { 1732 so = fp->f_data; 1733 1734 s = splnet(); 1735 1736 for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) { 1737 cbn = TAILQ_NEXT(cbe, list); 1738 if ((uap->aiocbp == NULL) || 1739 (uap->aiocbp == cbe->uuaiocb) ) { 1740 po = cbe->userproc; 1741 ki = po->p_aioinfo; 1742 TAILQ_REMOVE(&so->so_aiojobq, cbe, list); 1743 TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist); 1744 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist); 1745 if (ki->kaio_flags & KAIO_WAKEUP) { 1746 wakeup(po); 1747 } 1748 cbe->jobstate = JOBST_JOBFINISHED; 1749 cbe->uaiocb._aiocb_private.status=-1; 1750 cbe->uaiocb._aiocb_private.error=ECANCELED; 1751 cancelled++; 1752 /* XXX cancelled, knote? */ 1753 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1754 SIGEV_SIGNAL) { 1755 PROC_LOCK(cbe->userproc); 1756 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1757 PROC_UNLOCK(cbe->userproc); 1758 } 1759 if (uap->aiocbp) 1760 break; 1761 } 1762 } 1763 splx(s); 1764 1765 if ((cancelled) && (uap->aiocbp)) { 1766 td->td_retval[0] = AIO_CANCELED; 1767 return (0); 1768 } 1769 } 1770 ki=p->p_aioinfo; 1771 if (ki == NULL) 1772 goto done; 1773 s = splnet(); 1774 1775 for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) { 1776 cbn = TAILQ_NEXT(cbe, plist); 1777 1778 if ((uap->fd == cbe->uaiocb.aio_fildes) && 1779 ((uap->aiocbp == NULL ) || 1780 (uap->aiocbp == cbe->uuaiocb))) { 1781 1782 if (cbe->jobstate == JOBST_JOBQGLOBAL) { 1783 TAILQ_REMOVE(&aio_jobs, cbe, list); 1784 TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist); 1785 TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, 1786 plist); 1787 cancelled++; 1788 ki->kaio_queue_finished_count++; 1789 cbe->jobstate = JOBST_JOBFINISHED; 1790 cbe->uaiocb._aiocb_private.status = -1; 1791 cbe->uaiocb._aiocb_private.error = ECANCELED; 1792 /* XXX cancelled, knote? */ 1793 if (cbe->uaiocb.aio_sigevent.sigev_notify == 1794 SIGEV_SIGNAL) { 1795 PROC_LOCK(cbe->userproc); 1796 psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo); 1797 PROC_UNLOCK(cbe->userproc); 1798 } 1799 } else { 1800 notcancelled++; 1801 } 1802 } 1803 } 1804 splx(s); 1805 done: 1806 if (notcancelled) { 1807 td->td_retval[0] = AIO_NOTCANCELED; 1808 return (0); 1809 } 1810 if (cancelled) { 1811 td->td_retval[0] = AIO_CANCELED; 1812 return (0); 1813 } 1814 td->td_retval[0] = AIO_ALLDONE; 1815 1816 return (0); 1817 } 1818 1819 /* 1820 * aio_error is implemented in the kernel level for compatibility purposes only. 1821 * For a user mode async implementation, it would be best to do it in a userland 1822 * subroutine. 1823 */ 1824 int 1825 aio_error(struct thread *td, struct aio_error_args *uap) 1826 { 1827 struct proc *p = td->td_proc; 1828 int s; 1829 struct aiocblist *cb; 1830 struct kaioinfo *ki; 1831 long jobref; 1832 1833 ki = p->p_aioinfo; 1834 if (ki == NULL) 1835 return (EINVAL); 1836 1837 jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo); 1838 if ((jobref == -1) || (jobref == 0)) 1839 return (EINVAL); 1840 1841 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 1842 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1843 jobref) { 1844 td->td_retval[0] = cb->uaiocb._aiocb_private.error; 1845 return (0); 1846 } 1847 } 1848 1849 s = splnet(); 1850 1851 for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb, 1852 plist)) { 1853 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1854 jobref) { 1855 td->td_retval[0] = EINPROGRESS; 1856 splx(s); 1857 return (0); 1858 } 1859 } 1860 1861 for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb, 1862 plist)) { 1863 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1864 jobref) { 1865 td->td_retval[0] = EINPROGRESS; 1866 splx(s); 1867 return (0); 1868 } 1869 } 1870 splx(s); 1871 1872 s = splbio(); 1873 for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb, 1874 plist)) { 1875 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1876 jobref) { 1877 td->td_retval[0] = cb->uaiocb._aiocb_private.error; 1878 splx(s); 1879 return (0); 1880 } 1881 } 1882 1883 for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb, 1884 plist)) { 1885 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) == 1886 jobref) { 1887 td->td_retval[0] = EINPROGRESS; 1888 splx(s); 1889 return (0); 1890 } 1891 } 1892 splx(s); 1893 1894 #if (0) 1895 /* 1896 * Hack for lio. 1897 */ 1898 status = fuword(&uap->aiocbp->_aiocb_private.status); 1899 if (status == -1) 1900 return fuword(&uap->aiocbp->_aiocb_private.error); 1901 #endif 1902 return (EINVAL); 1903 } 1904 1905 /* syscall - asynchronous read from a file (REALTIME) */ 1906 int 1907 aio_read(struct thread *td, struct aio_read_args *uap) 1908 { 1909 1910 return aio_aqueue(td, uap->aiocbp, LIO_READ); 1911 } 1912 1913 /* syscall - asynchronous write to a file (REALTIME) */ 1914 int 1915 aio_write(struct thread *td, struct aio_write_args *uap) 1916 { 1917 1918 return aio_aqueue(td, uap->aiocbp, LIO_WRITE); 1919 } 1920 1921 /* syscall - list directed I/O (REALTIME) */ 1922 int 1923 lio_listio(struct thread *td, struct lio_listio_args *uap) 1924 { 1925 struct proc *p = td->td_proc; 1926 int nent, nentqueued; 1927 struct aiocb *iocb, * const *cbptr; 1928 struct aiocblist *cb; 1929 struct kaioinfo *ki; 1930 struct aio_liojob *lj; 1931 int error, runningcode; 1932 int nerror; 1933 int i; 1934 int s; 1935 1936 if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT)) 1937 return (EINVAL); 1938 1939 nent = uap->nent; 1940 if (nent < 0 || nent > AIO_LISTIO_MAX) 1941 return (EINVAL); 1942 1943 if (p->p_aioinfo == NULL) 1944 aio_init_aioinfo(p); 1945 1946 if ((nent + num_queue_count) > max_queue_count) 1947 return (EAGAIN); 1948 1949 ki = p->p_aioinfo; 1950 if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) 1951 return (EAGAIN); 1952 1953 lj = uma_zalloc(aiolio_zone, M_WAITOK); 1954 if (!lj) 1955 return (EAGAIN); 1956 1957 lj->lioj_flags = 0; 1958 lj->lioj_buffer_count = 0; 1959 lj->lioj_buffer_finished_count = 0; 1960 lj->lioj_queue_count = 0; 1961 lj->lioj_queue_finished_count = 0; 1962 lj->lioj_ki = ki; 1963 1964 /* 1965 * Setup signal. 1966 */ 1967 if (uap->sig && (uap->mode == LIO_NOWAIT)) { 1968 error = copyin(uap->sig, &lj->lioj_signal, 1969 sizeof(lj->lioj_signal)); 1970 if (error) { 1971 uma_zfree(aiolio_zone, lj); 1972 return (error); 1973 } 1974 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) { 1975 uma_zfree(aiolio_zone, lj); 1976 return (EINVAL); 1977 } 1978 lj->lioj_flags |= LIOJ_SIGNAL; 1979 } 1980 TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list); 1981 /* 1982 * Get pointers to the list of I/O requests. 1983 */ 1984 nerror = 0; 1985 nentqueued = 0; 1986 cbptr = uap->acb_list; 1987 for (i = 0; i < uap->nent; i++) { 1988 iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]); 1989 if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) { 1990 error = _aio_aqueue(td, iocb, lj, 0); 1991 if (error == 0) 1992 nentqueued++; 1993 else 1994 nerror++; 1995 } 1996 } 1997 1998 /* 1999 * If we haven't queued any, then just return error. 2000 */ 2001 if (nentqueued == 0) 2002 return (0); 2003 2004 /* 2005 * Calculate the appropriate error return. 2006 */ 2007 runningcode = 0; 2008 if (nerror) 2009 runningcode = EIO; 2010 2011 if (uap->mode == LIO_WAIT) { 2012 int command, found, jobref; 2013 2014 for (;;) { 2015 found = 0; 2016 for (i = 0; i < uap->nent; i++) { 2017 /* 2018 * Fetch address of the control buf pointer in 2019 * user space. 2020 */ 2021 iocb = (struct aiocb *) 2022 (intptr_t)fuword(&cbptr[i]); 2023 if (((intptr_t)iocb == -1) || ((intptr_t)iocb 2024 == 0)) 2025 continue; 2026 2027 /* 2028 * Fetch the associated command from user space. 2029 */ 2030 command = fuword(&iocb->aio_lio_opcode); 2031 if (command == LIO_NOP) { 2032 found++; 2033 continue; 2034 } 2035 2036 jobref = 2037 fuword(&iocb->_aiocb_private.kernelinfo); 2038 2039 TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) { 2040 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 2041 == jobref) { 2042 if (cb->uaiocb.aio_lio_opcode 2043 == LIO_WRITE) { 2044 p->p_stats->p_ru.ru_oublock 2045 += 2046 cb->outputcharge; 2047 cb->outputcharge = 0; 2048 } else if (cb->uaiocb.aio_lio_opcode 2049 == LIO_READ) { 2050 p->p_stats->p_ru.ru_inblock 2051 += cb->inputcharge; 2052 cb->inputcharge = 0; 2053 } 2054 found++; 2055 break; 2056 } 2057 } 2058 2059 s = splbio(); 2060 TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) { 2061 if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) 2062 == jobref) { 2063 found++; 2064 break; 2065 } 2066 } 2067 splx(s); 2068 } 2069 2070 /* 2071 * If all I/Os have been disposed of, then we can 2072 * return. 2073 */ 2074 if (found == nentqueued) 2075 return (runningcode); 2076 2077 ki->kaio_flags |= KAIO_WAKEUP; 2078 error = tsleep(p, PRIBIO | PCATCH, "aiospn", 0); 2079 2080 if (error == EINTR) 2081 return (EINTR); 2082 else if (error == EWOULDBLOCK) 2083 return (EAGAIN); 2084 } 2085 } 2086 2087 return (runningcode); 2088 } 2089 2090 /* 2091 * This is a weird hack so that we can post a signal. It is safe to do so from 2092 * a timeout routine, but *not* from an interrupt routine. 2093 */ 2094 static void 2095 process_signal(void *aioj) 2096 { 2097 struct aiocblist *aiocbe = aioj; 2098 struct aio_liojob *lj = aiocbe->lio; 2099 struct aiocb *cb = &aiocbe->uaiocb; 2100 2101 if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) && 2102 (lj->lioj_queue_count == lj->lioj_queue_finished_count)) { 2103 PROC_LOCK(lj->lioj_ki->kaio_p); 2104 psignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo); 2105 PROC_UNLOCK(lj->lioj_ki->kaio_p); 2106 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2107 } 2108 2109 if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) { 2110 PROC_LOCK(aiocbe->userproc); 2111 psignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo); 2112 PROC_UNLOCK(aiocbe->userproc); 2113 } 2114 } 2115 2116 /* 2117 * Interrupt handler for physio, performs the necessary process wakeups, and 2118 * signals. 2119 */ 2120 static void 2121 aio_physwakeup(struct buf *bp) 2122 { 2123 struct aiocblist *aiocbe; 2124 struct proc *p; 2125 struct kaioinfo *ki; 2126 struct aio_liojob *lj; 2127 2128 wakeup(bp); 2129 2130 aiocbe = (struct aiocblist *)bp->b_spc; 2131 if (aiocbe) { 2132 p = bp->b_caller1; 2133 2134 aiocbe->jobstate = JOBST_JOBBFINISHED; 2135 aiocbe->uaiocb._aiocb_private.status -= bp->b_resid; 2136 aiocbe->uaiocb._aiocb_private.error = 0; 2137 aiocbe->jobflags |= AIOCBLIST_DONE; 2138 2139 if (bp->b_ioflags & BIO_ERROR) 2140 aiocbe->uaiocb._aiocb_private.error = bp->b_error; 2141 2142 lj = aiocbe->lio; 2143 if (lj) { 2144 lj->lioj_buffer_finished_count++; 2145 2146 /* 2147 * wakeup/signal if all of the interrupt jobs are done. 2148 */ 2149 if (lj->lioj_buffer_finished_count == 2150 lj->lioj_buffer_count) { 2151 /* 2152 * Post a signal if it is called for. 2153 */ 2154 if ((lj->lioj_flags & 2155 (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) == 2156 LIOJ_SIGNAL) { 2157 lj->lioj_flags |= LIOJ_SIGNAL_POSTED; 2158 aiocbe->timeouthandle = 2159 timeout(process_signal, 2160 aiocbe, 0); 2161 } 2162 } 2163 } 2164 2165 ki = p->p_aioinfo; 2166 if (ki) { 2167 ki->kaio_buffer_finished_count++; 2168 TAILQ_REMOVE(&aio_bufjobs, aiocbe, list); 2169 TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist); 2170 TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist); 2171 2172 KNOTE(&aiocbe->klist, 0); 2173 /* Do the wakeup. */ 2174 if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) { 2175 ki->kaio_flags &= ~KAIO_WAKEUP; 2176 wakeup(p); 2177 } 2178 } 2179 2180 if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL) 2181 aiocbe->timeouthandle = 2182 timeout(process_signal, aiocbe, 0); 2183 } 2184 } 2185 2186 /* syscall - wait for the next completion of an aio request */ 2187 int 2188 aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap) 2189 { 2190 struct proc *p = td->td_proc; 2191 struct timeval atv; 2192 struct timespec ts; 2193 struct kaioinfo *ki; 2194 struct aiocblist *cb = NULL; 2195 int error, s, timo; 2196 2197 suword(uap->aiocbp, (int)NULL); 2198 2199 timo = 0; 2200 if (uap->timeout) { 2201 /* Get timespec struct. */ 2202 error = copyin(uap->timeout, &ts, sizeof(ts)); 2203 if (error) 2204 return (error); 2205 2206 if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000)) 2207 return (EINVAL); 2208 2209 TIMESPEC_TO_TIMEVAL(&atv, &ts); 2210 if (itimerfix(&atv)) 2211 return (EINVAL); 2212 timo = tvtohz(&atv); 2213 } 2214 2215 ki = p->p_aioinfo; 2216 if (ki == NULL) 2217 return (EAGAIN); 2218 2219 for (;;) { 2220 if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) { 2221 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2222 td->td_retval[0] = cb->uaiocb._aiocb_private.status; 2223 if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) { 2224 p->p_stats->p_ru.ru_oublock += 2225 cb->outputcharge; 2226 cb->outputcharge = 0; 2227 } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) { 2228 p->p_stats->p_ru.ru_inblock += cb->inputcharge; 2229 cb->inputcharge = 0; 2230 } 2231 aio_free_entry(cb); 2232 return (cb->uaiocb._aiocb_private.error); 2233 } 2234 2235 s = splbio(); 2236 if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) { 2237 splx(s); 2238 suword(uap->aiocbp, (uintptr_t)cb->uuaiocb); 2239 td->td_retval[0] = cb->uaiocb._aiocb_private.status; 2240 aio_free_entry(cb); 2241 return (cb->uaiocb._aiocb_private.error); 2242 } 2243 2244 ki->kaio_flags |= KAIO_WAKEUP; 2245 error = tsleep(p, PRIBIO | PCATCH, "aiowc", timo); 2246 splx(s); 2247 2248 if (error == ERESTART) 2249 return (EINTR); 2250 else if (error < 0) 2251 return (error); 2252 else if (error == EINTR) 2253 return (EINTR); 2254 else if (error == EWOULDBLOCK) 2255 return (EAGAIN); 2256 } 2257 } 2258 2259 /* kqueue attach function */ 2260 static int 2261 filt_aioattach(struct knote *kn) 2262 { 2263 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2264 2265 /* 2266 * The aiocbe pointer must be validated before using it, so 2267 * registration is restricted to the kernel; the user cannot 2268 * set EV_FLAG1. 2269 */ 2270 if ((kn->kn_flags & EV_FLAG1) == 0) 2271 return (EPERM); 2272 kn->kn_flags &= ~EV_FLAG1; 2273 2274 SLIST_INSERT_HEAD(&aiocbe->klist, kn, kn_selnext); 2275 2276 return (0); 2277 } 2278 2279 /* kqueue detach function */ 2280 static void 2281 filt_aiodetach(struct knote *kn) 2282 { 2283 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2284 2285 SLIST_REMOVE(&aiocbe->klist, kn, knote, kn_selnext); 2286 } 2287 2288 /* kqueue filter function */ 2289 /*ARGSUSED*/ 2290 static int 2291 filt_aio(struct knote *kn, long hint) 2292 { 2293 struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata; 2294 2295 kn->kn_data = aiocbe->uaiocb._aiocb_private.error; 2296 if (aiocbe->jobstate != JOBST_JOBFINISHED && 2297 aiocbe->jobstate != JOBST_JOBBFINISHED) 2298 return (0); 2299 kn->kn_flags |= EV_EOF; 2300 return (1); 2301 }
Cache object: f0ddcd2531667957bcebeaa6ea5a77c8
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