sys_aio.c revision 1.15.6.2
1 /* $NetBSD: sys_aio.c,v 1.15.6.2 2008/06/02 13:24:11 mjf Exp $ */ 2 3 /* 4 * Copyright (c) 2007, Mindaugas Rasiukevicius <rmind at NetBSD org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * Implementation of POSIX asynchronous I/O. 31 * Defined in the Base Definitions volume of IEEE Std 1003.1-2001. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: sys_aio.c,v 1.15.6.2 2008/06/02 13:24:11 mjf Exp $"); 36 37 #include "opt_ddb.h" 38 39 #include <sys/param.h> 40 #include <sys/condvar.h> 41 #include <sys/file.h> 42 #include <sys/filedesc.h> 43 #include <sys/kernel.h> 44 #include <sys/kmem.h> 45 #include <sys/lwp.h> 46 #include <sys/mutex.h> 47 #include <sys/pool.h> 48 #include <sys/proc.h> 49 #include <sys/queue.h> 50 #include <sys/signal.h> 51 #include <sys/signalvar.h> 52 #include <sys/syscallargs.h> 53 #include <sys/sysctl.h> 54 #include <sys/systm.h> 55 #include <sys/types.h> 56 #include <sys/vnode.h> 57 #include <sys/atomic.h> 58 59 #include <uvm/uvm_extern.h> 60 61 /* 62 * System-wide limits and counter of AIO operations. 63 */ 64 static u_int aio_listio_max = AIO_LISTIO_MAX; 65 static u_int aio_max = AIO_MAX; 66 static u_int aio_jobs_count; 67 68 static struct pool aio_job_pool; 69 static struct pool aio_lio_pool; 70 71 /* Prototypes */ 72 void aio_worker(void *); 73 static void aio_process(struct aio_job *); 74 static void aio_sendsig(struct proc *, struct sigevent *); 75 static int aio_enqueue_job(int, void *, struct lio_req *); 76 77 /* 78 * Initialize the AIO system. 79 */ 80 void 81 aio_sysinit(void) 82 { 83 84 pool_init(&aio_job_pool, sizeof(struct aio_job), 0, 0, 0, 85 "aio_jobs_pool", &pool_allocator_nointr, IPL_NONE); 86 pool_init(&aio_lio_pool, sizeof(struct lio_req), 0, 0, 0, 87 "aio_lio_pool", &pool_allocator_nointr, IPL_NONE); 88 } 89 90 /* 91 * Initialize Asynchronous I/O data structures for the process. 92 */ 93 int 94 aio_init(struct proc *p) 95 { 96 struct aioproc *aio; 97 struct lwp *l; 98 int error; 99 bool inmem; 100 vaddr_t uaddr; 101 102 /* Allocate and initialize AIO structure */ 103 aio = kmem_zalloc(sizeof(struct aioproc), KM_SLEEP); 104 if (aio == NULL) 105 return EAGAIN; 106 107 /* Initialize queue and their synchronization structures */ 108 mutex_init(&aio->aio_mtx, MUTEX_DEFAULT, IPL_NONE); 109 cv_init(&aio->aio_worker_cv, "aiowork"); 110 cv_init(&aio->done_cv, "aiodone"); 111 TAILQ_INIT(&aio->jobs_queue); 112 113 /* 114 * Create an AIO worker thread. 115 * XXX: Currently, AIO thread is not protected against user's actions. 116 */ 117 inmem = uvm_uarea_alloc(&uaddr); 118 if (uaddr == 0) { 119 aio_exit(p, aio); 120 return EAGAIN; 121 } 122 error = lwp_create(curlwp, p, uaddr, inmem, 0, NULL, 0, aio_worker, 123 NULL, &l, curlwp->l_class); 124 if (error != 0) { 125 uvm_uarea_free(uaddr, curcpu()); 126 aio_exit(p, aio); 127 return error; 128 } 129 130 /* Recheck if we are really first */ 131 mutex_enter(p->p_lock); 132 if (p->p_aio) { 133 mutex_exit(p->p_lock); 134 aio_exit(p, aio); 135 lwp_exit(l); 136 return 0; 137 } 138 p->p_aio = aio; 139 140 /* Complete the initialization of thread, and run it */ 141 aio->aio_worker = l; 142 p->p_nrlwps++; 143 lwp_lock(l); 144 l->l_stat = LSRUN; 145 l->l_priority = MAXPRI_USER; 146 sched_enqueue(l, false); 147 lwp_unlock(l); 148 mutex_exit(p->p_lock); 149 150 return 0; 151 } 152 153 /* 154 * Exit of Asynchronous I/O subsystem of process. 155 */ 156 void 157 aio_exit(struct proc *p, struct aioproc *aio) 158 { 159 struct aio_job *a_job; 160 161 if (aio == NULL) 162 return; 163 164 /* Free AIO queue */ 165 while (!TAILQ_EMPTY(&aio->jobs_queue)) { 166 a_job = TAILQ_FIRST(&aio->jobs_queue); 167 TAILQ_REMOVE(&aio->jobs_queue, a_job, list); 168 pool_put(&aio_job_pool, a_job); 169 atomic_dec_uint(&aio_jobs_count); 170 } 171 172 /* Destroy and free the entire AIO data structure */ 173 cv_destroy(&aio->aio_worker_cv); 174 cv_destroy(&aio->done_cv); 175 mutex_destroy(&aio->aio_mtx); 176 kmem_free(aio, sizeof(struct aioproc)); 177 } 178 179 /* 180 * AIO worker thread and processor. 181 */ 182 void 183 aio_worker(void *arg) 184 { 185 struct proc *p = curlwp->l_proc; 186 struct aioproc *aio = p->p_aio; 187 struct aio_job *a_job; 188 struct lio_req *lio; 189 sigset_t oss, nss; 190 int error, refcnt; 191 192 /* 193 * Make an empty signal mask, so it 194 * handles only SIGKILL and SIGSTOP. 195 */ 196 sigfillset(&nss); 197 mutex_enter(p->p_lock); 198 error = sigprocmask1(curlwp, SIG_SETMASK, &nss, &oss); 199 mutex_exit(p->p_lock); 200 KASSERT(error == 0); 201 202 for (;;) { 203 /* 204 * Loop for each job in the queue. If there 205 * are no jobs then sleep. 206 */ 207 mutex_enter(&aio->aio_mtx); 208 while ((a_job = TAILQ_FIRST(&aio->jobs_queue)) == NULL) { 209 if (cv_wait_sig(&aio->aio_worker_cv, &aio->aio_mtx)) { 210 /* 211 * Thread was interrupted - check for 212 * pending exit or suspend. 213 */ 214 mutex_exit(&aio->aio_mtx); 215 lwp_userret(curlwp); 216 mutex_enter(&aio->aio_mtx); 217 } 218 } 219 220 /* Take the job from the queue */ 221 aio->curjob = a_job; 222 TAILQ_REMOVE(&aio->jobs_queue, a_job, list); 223 224 atomic_dec_uint(&aio_jobs_count); 225 aio->jobs_count--; 226 227 mutex_exit(&aio->aio_mtx); 228 229 /* Process an AIO operation */ 230 aio_process(a_job); 231 232 /* Copy data structure back to the user-space */ 233 (void)copyout(&a_job->aiocbp, a_job->aiocb_uptr, 234 sizeof(struct aiocb)); 235 236 mutex_enter(&aio->aio_mtx); 237 aio->curjob = NULL; 238 239 /* Decrease a reference counter, if there is a LIO structure */ 240 lio = a_job->lio; 241 refcnt = (lio != NULL ? --lio->refcnt : -1); 242 243 /* Notify all suspenders */ 244 cv_broadcast(&aio->done_cv); 245 mutex_exit(&aio->aio_mtx); 246 247 /* Send a signal, if any */ 248 aio_sendsig(p, &a_job->aiocbp.aio_sigevent); 249 250 /* Destroy the LIO structure */ 251 if (refcnt == 0) { 252 aio_sendsig(p, &lio->sig); 253 pool_put(&aio_lio_pool, lio); 254 } 255 256 /* Destroy the the job */ 257 pool_put(&aio_job_pool, a_job); 258 } 259 260 /* NOTREACHED */ 261 } 262 263 static void 264 aio_process(struct aio_job *a_job) 265 { 266 struct proc *p = curlwp->l_proc; 267 struct aiocb *aiocbp = &a_job->aiocbp; 268 struct file *fp; 269 int fd = aiocbp->aio_fildes; 270 int error = 0; 271 272 KASSERT(a_job->aio_op != 0); 273 274 if ((a_job->aio_op & (AIO_READ | AIO_WRITE)) != 0) { 275 struct iovec aiov; 276 struct uio auio; 277 278 if (aiocbp->aio_nbytes > SSIZE_MAX) { 279 error = EINVAL; 280 goto done; 281 } 282 283 fp = fd_getfile(fd); 284 if (fp == NULL) { 285 error = EBADF; 286 goto done; 287 } 288 289 aiov.iov_base = (void *)(uintptr_t)aiocbp->aio_buf; 290 aiov.iov_len = aiocbp->aio_nbytes; 291 auio.uio_iov = &aiov; 292 auio.uio_iovcnt = 1; 293 auio.uio_resid = aiocbp->aio_nbytes; 294 auio.uio_vmspace = p->p_vmspace; 295 296 if (a_job->aio_op & AIO_READ) { 297 /* 298 * Perform a Read operation 299 */ 300 KASSERT((a_job->aio_op & AIO_WRITE) == 0); 301 302 if ((fp->f_flag & FREAD) == 0) { 303 fd_putfile(fd); 304 error = EBADF; 305 goto done; 306 } 307 auio.uio_rw = UIO_READ; 308 error = (*fp->f_ops->fo_read)(fp, &aiocbp->aio_offset, 309 &auio, fp->f_cred, FOF_UPDATE_OFFSET); 310 } else { 311 /* 312 * Perform a Write operation 313 */ 314 KASSERT(a_job->aio_op & AIO_WRITE); 315 316 if ((fp->f_flag & FWRITE) == 0) { 317 fd_putfile(fd); 318 error = EBADF; 319 goto done; 320 } 321 auio.uio_rw = UIO_WRITE; 322 error = (*fp->f_ops->fo_write)(fp, &aiocbp->aio_offset, 323 &auio, fp->f_cred, FOF_UPDATE_OFFSET); 324 } 325 fd_putfile(fd); 326 327 /* Store the result value */ 328 a_job->aiocbp.aio_nbytes -= auio.uio_resid; 329 a_job->aiocbp._retval = (error == 0) ? 330 a_job->aiocbp.aio_nbytes : -1; 331 332 } else if ((a_job->aio_op & (AIO_SYNC | AIO_DSYNC)) != 0) { 333 /* 334 * Perform a file Sync operation 335 */ 336 struct vnode *vp; 337 338 if ((error = fd_getvnode(fd, &fp)) != 0) 339 goto done; 340 341 if ((fp->f_flag & FWRITE) == 0) { 342 fd_putfile(fd); 343 error = EBADF; 344 goto done; 345 } 346 347 vp = (struct vnode *)fp->f_data; 348 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 349 if (a_job->aio_op & AIO_DSYNC) { 350 error = VOP_FSYNC(vp, fp->f_cred, 351 FSYNC_WAIT | FSYNC_DATAONLY, 0, 0); 352 } else if (a_job->aio_op & AIO_SYNC) { 353 error = VOP_FSYNC(vp, fp->f_cred, 354 FSYNC_WAIT, 0, 0); 355 if (error == 0 && bioopsp != NULL && 356 vp->v_mount && 357 (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 358 bioopsp->io_fsync(vp, 0); 359 } 360 VOP_UNLOCK(vp, 0); 361 fd_putfile(fd); 362 363 /* Store the result value */ 364 a_job->aiocbp._retval = (error == 0) ? 0 : -1; 365 366 } else 367 panic("aio_process: invalid operation code\n"); 368 369 done: 370 /* Job is done, set the error, if any */ 371 a_job->aiocbp._errno = error; 372 a_job->aiocbp._state = JOB_DONE; 373 } 374 375 /* 376 * Send AIO signal. 377 */ 378 static void 379 aio_sendsig(struct proc *p, struct sigevent *sig) 380 { 381 ksiginfo_t ksi; 382 383 if (sig->sigev_signo == 0 || sig->sigev_notify == SIGEV_NONE) 384 return; 385 386 KSI_INIT(&ksi); 387 ksi.ksi_signo = sig->sigev_signo; 388 ksi.ksi_code = SI_ASYNCIO; 389 ksi.ksi_value = sig->sigev_value; 390 mutex_enter(proc_lock); 391 kpsignal(p, &ksi, NULL); 392 mutex_exit(proc_lock); 393 } 394 395 /* 396 * Enqueue the job. 397 */ 398 static int 399 aio_enqueue_job(int op, void *aiocb_uptr, struct lio_req *lio) 400 { 401 struct proc *p = curlwp->l_proc; 402 struct aioproc *aio; 403 struct aio_job *a_job; 404 struct aiocb aiocbp; 405 struct sigevent *sig; 406 int error; 407 408 /* Non-accurate check for the limit */ 409 if (aio_jobs_count + 1 > aio_max) 410 return EAGAIN; 411 412 /* Get the data structure from user-space */ 413 error = copyin(aiocb_uptr, &aiocbp, sizeof(struct aiocb)); 414 if (error) 415 return error; 416 417 /* Check if signal is set, and validate it */ 418 sig = &aiocbp.aio_sigevent; 419 if (sig->sigev_signo < 0 || sig->sigev_signo >= NSIG || 420 sig->sigev_notify < SIGEV_NONE || sig->sigev_notify > SIGEV_SA) 421 return EINVAL; 422 423 /* Buffer and byte count */ 424 if (((AIO_SYNC | AIO_DSYNC) & op) == 0) 425 if (aiocbp.aio_buf == NULL || aiocbp.aio_nbytes > SSIZE_MAX) 426 return EINVAL; 427 428 /* Check the opcode, if LIO_NOP - simply ignore */ 429 if (op == AIO_LIO) { 430 KASSERT(lio != NULL); 431 if (aiocbp.aio_lio_opcode == LIO_WRITE) 432 op = AIO_WRITE; 433 else if (aiocbp.aio_lio_opcode == LIO_READ) 434 op = AIO_READ; 435 else 436 return (aiocbp.aio_lio_opcode == LIO_NOP) ? 0 : EINVAL; 437 } else { 438 KASSERT(lio == NULL); 439 } 440 441 /* 442 * Look for already existing job. If found - the job is in-progress. 443 * According to POSIX this is invalid, so return the error. 444 */ 445 aio = p->p_aio; 446 if (aio) { 447 mutex_enter(&aio->aio_mtx); 448 if (aio->curjob) { 449 a_job = aio->curjob; 450 if (a_job->aiocb_uptr == aiocb_uptr) { 451 mutex_exit(&aio->aio_mtx); 452 return EINVAL; 453 } 454 } 455 TAILQ_FOREACH(a_job, &aio->jobs_queue, list) { 456 if (a_job->aiocb_uptr != aiocb_uptr) 457 continue; 458 mutex_exit(&aio->aio_mtx); 459 return EINVAL; 460 } 461 mutex_exit(&aio->aio_mtx); 462 } 463 464 /* 465 * Check if AIO structure is initialized, if not - initialize it. 466 * In LIO case, we did that already. We will recheck this with 467 * the lock in aio_init(). 468 */ 469 if (lio == NULL && p->p_aio == NULL) 470 if (aio_init(p)) 471 return EAGAIN; 472 aio = p->p_aio; 473 474 /* 475 * Set the state with errno, and copy data 476 * structure back to the user-space. 477 */ 478 aiocbp._state = JOB_WIP; 479 aiocbp._errno = EINPROGRESS; 480 aiocbp._retval = -1; 481 error = copyout(&aiocbp, aiocb_uptr, sizeof(struct aiocb)); 482 if (error) 483 return error; 484 485 /* Allocate and initialize a new AIO job */ 486 a_job = pool_get(&aio_job_pool, PR_WAITOK); 487 memset(a_job, 0, sizeof(struct aio_job)); 488 489 /* 490 * Set the data. 491 * Store the user-space pointer for searching. Since we 492 * are storing only per proc pointers - it is safe. 493 */ 494 memcpy(&a_job->aiocbp, &aiocbp, sizeof(struct aiocb)); 495 a_job->aiocb_uptr = aiocb_uptr; 496 a_job->aio_op |= op; 497 a_job->lio = lio; 498 499 /* 500 * Add the job to the queue, update the counters, and 501 * notify the AIO worker thread to handle the job. 502 */ 503 mutex_enter(&aio->aio_mtx); 504 505 /* Fail, if the limit was reached */ 506 if (atomic_inc_uint_nv(&aio_jobs_count) > aio_max || 507 aio->jobs_count >= aio_listio_max) { 508 atomic_dec_uint(&aio_jobs_count); 509 mutex_exit(&aio->aio_mtx); 510 pool_put(&aio_job_pool, a_job); 511 return EAGAIN; 512 } 513 514 TAILQ_INSERT_TAIL(&aio->jobs_queue, a_job, list); 515 aio->jobs_count++; 516 if (lio) 517 lio->refcnt++; 518 cv_signal(&aio->aio_worker_cv); 519 520 mutex_exit(&aio->aio_mtx); 521 522 /* 523 * One would handle the errors only with aio_error() function. 524 * This way is appropriate according to POSIX. 525 */ 526 return 0; 527 } 528 529 /* 530 * Syscall functions. 531 */ 532 533 int 534 sys_aio_cancel(struct lwp *l, const struct sys_aio_cancel_args *uap, register_t *retval) 535 { 536 /* { 537 syscallarg(int) fildes; 538 syscallarg(struct aiocb *) aiocbp; 539 } */ 540 struct proc *p = l->l_proc; 541 struct aioproc *aio; 542 struct aio_job *a_job; 543 struct aiocb *aiocbp_ptr; 544 struct lio_req *lio; 545 struct filedesc *fdp = p->p_fd; 546 unsigned int cn, errcnt, fildes; 547 548 TAILQ_HEAD(, aio_job) tmp_jobs_list; 549 550 /* Check for invalid file descriptor */ 551 fildes = (unsigned int)SCARG(uap, fildes); 552 if (fildes >= fdp->fd_nfiles) 553 return EBADF; 554 membar_consumer(); 555 if (fdp->fd_ofiles[fildes] == NULL || fdp->fd_ofiles[fildes]->ff_file == NULL) 556 return EBADF; 557 558 /* Check if AIO structure is initialized */ 559 if (p->p_aio == NULL) { 560 *retval = AIO_NOTCANCELED; 561 return 0; 562 } 563 564 aio = p->p_aio; 565 aiocbp_ptr = (struct aiocb *)SCARG(uap, aiocbp); 566 567 mutex_enter(&aio->aio_mtx); 568 569 /* Cancel the jobs, and remove them from the queue */ 570 cn = 0; 571 TAILQ_INIT(&tmp_jobs_list); 572 TAILQ_FOREACH(a_job, &aio->jobs_queue, list) { 573 if (aiocbp_ptr) { 574 if (aiocbp_ptr != a_job->aiocb_uptr) 575 continue; 576 if (fildes != a_job->aiocbp.aio_fildes) { 577 mutex_exit(&aio->aio_mtx); 578 return EBADF; 579 } 580 } else if (a_job->aiocbp.aio_fildes != fildes) 581 continue; 582 583 TAILQ_REMOVE(&aio->jobs_queue, a_job, list); 584 TAILQ_INSERT_TAIL(&tmp_jobs_list, a_job, list); 585 586 /* Decrease the counters */ 587 atomic_dec_uint(&aio_jobs_count); 588 aio->jobs_count--; 589 lio = a_job->lio; 590 if (lio != NULL && --lio->refcnt != 0) 591 a_job->lio = NULL; 592 593 cn++; 594 if (aiocbp_ptr) 595 break; 596 } 597 598 /* There are canceled jobs */ 599 if (cn) 600 *retval = AIO_CANCELED; 601 602 /* We cannot cancel current job */ 603 a_job = aio->curjob; 604 if (a_job && ((a_job->aiocbp.aio_fildes == fildes) || 605 (a_job->aiocb_uptr == aiocbp_ptr))) 606 *retval = AIO_NOTCANCELED; 607 608 mutex_exit(&aio->aio_mtx); 609 610 /* Free the jobs after the lock */ 611 errcnt = 0; 612 while (!TAILQ_EMPTY(&tmp_jobs_list)) { 613 a_job = TAILQ_FIRST(&tmp_jobs_list); 614 TAILQ_REMOVE(&tmp_jobs_list, a_job, list); 615 /* Set the errno and copy structures back to the user-space */ 616 a_job->aiocbp._errno = ECANCELED; 617 a_job->aiocbp._state = JOB_DONE; 618 if (copyout(&a_job->aiocbp, a_job->aiocb_uptr, 619 sizeof(struct aiocb))) 620 errcnt++; 621 /* Send a signal if any */ 622 aio_sendsig(p, &a_job->aiocbp.aio_sigevent); 623 if (a_job->lio) { 624 lio = a_job->lio; 625 aio_sendsig(p, &lio->sig); 626 pool_put(&aio_lio_pool, lio); 627 } 628 pool_put(&aio_job_pool, a_job); 629 } 630 631 if (errcnt) 632 return EFAULT; 633 634 /* Set a correct return value */ 635 if (*retval == 0) 636 *retval = AIO_ALLDONE; 637 638 return 0; 639 } 640 641 int 642 sys_aio_error(struct lwp *l, const struct sys_aio_error_args *uap, register_t *retval) 643 { 644 /* { 645 syscallarg(const struct aiocb *) aiocbp; 646 } */ 647 struct proc *p = l->l_proc; 648 struct aioproc *aio = p->p_aio; 649 struct aiocb aiocbp; 650 int error; 651 652 if (aio == NULL) 653 return EINVAL; 654 655 error = copyin(SCARG(uap, aiocbp), &aiocbp, sizeof(struct aiocb)); 656 if (error) 657 return error; 658 659 if (aiocbp._state == JOB_NONE) 660 return EINVAL; 661 662 *retval = aiocbp._errno; 663 664 return 0; 665 } 666 667 int 668 sys_aio_fsync(struct lwp *l, const struct sys_aio_fsync_args *uap, register_t *retval) 669 { 670 /* { 671 syscallarg(int) op; 672 syscallarg(struct aiocb *) aiocbp; 673 } */ 674 int op = SCARG(uap, op); 675 676 if ((op != O_DSYNC) && (op != O_SYNC)) 677 return EINVAL; 678 679 op = O_DSYNC ? AIO_DSYNC : AIO_SYNC; 680 681 return aio_enqueue_job(op, SCARG(uap, aiocbp), NULL); 682 } 683 684 int 685 sys_aio_read(struct lwp *l, const struct sys_aio_read_args *uap, register_t *retval) 686 { 687 /* { 688 syscallarg(struct aiocb *) aiocbp; 689 } */ 690 691 return aio_enqueue_job(AIO_READ, SCARG(uap, aiocbp), NULL); 692 } 693 694 int 695 sys_aio_return(struct lwp *l, const struct sys_aio_return_args *uap, register_t *retval) 696 { 697 /* { 698 syscallarg(struct aiocb *) aiocbp; 699 } */ 700 struct proc *p = l->l_proc; 701 struct aioproc *aio = p->p_aio; 702 struct aiocb aiocbp; 703 int error; 704 705 if (aio == NULL) 706 return EINVAL; 707 708 error = copyin(SCARG(uap, aiocbp), &aiocbp, sizeof(struct aiocb)); 709 if (error) 710 return error; 711 712 if (aiocbp._errno == EINPROGRESS || aiocbp._state != JOB_DONE) 713 return EINVAL; 714 715 *retval = aiocbp._retval; 716 717 /* Reset the internal variables */ 718 aiocbp._errno = 0; 719 aiocbp._retval = -1; 720 aiocbp._state = JOB_NONE; 721 error = copyout(&aiocbp, SCARG(uap, aiocbp), sizeof(struct aiocb)); 722 723 return error; 724 } 725 726 int 727 sys_aio_suspend(struct lwp *l, const struct sys_aio_suspend_args *uap, register_t *retval) 728 { 729 /* { 730 syscallarg(const struct aiocb *const[]) list; 731 syscallarg(int) nent; 732 syscallarg(const struct timespec *) timeout; 733 } */ 734 struct proc *p = l->l_proc; 735 struct aioproc *aio; 736 struct aio_job *a_job; 737 struct aiocb **aiocbp_list; 738 struct timespec ts; 739 int i, error, nent, timo; 740 741 if (p->p_aio == NULL) 742 return EAGAIN; 743 aio = p->p_aio; 744 745 nent = SCARG(uap, nent); 746 if (nent <= 0 || nent > aio_listio_max) 747 return EAGAIN; 748 749 if (SCARG(uap, timeout)) { 750 /* Convert timespec to ticks */ 751 error = copyin(SCARG(uap, timeout), &ts, 752 sizeof(struct timespec)); 753 if (error) 754 return error; 755 timo = mstohz((ts.tv_sec * 1000) + (ts.tv_nsec / 1000000)); 756 if (timo == 0 && ts.tv_sec == 0 && ts.tv_nsec > 0) 757 timo = 1; 758 if (timo <= 0) 759 return EAGAIN; 760 } else 761 timo = 0; 762 763 /* Get the list from user-space */ 764 aiocbp_list = kmem_zalloc(nent * sizeof(struct aio_job), KM_SLEEP); 765 error = copyin(SCARG(uap, list), aiocbp_list, 766 nent * sizeof(struct aiocb)); 767 if (error) { 768 kmem_free(aiocbp_list, nent * sizeof(struct aio_job)); 769 return error; 770 } 771 772 mutex_enter(&aio->aio_mtx); 773 for (;;) { 774 775 for (i = 0; i < nent; i++) { 776 777 /* Skip NULL entries */ 778 if (aiocbp_list[i] == NULL) 779 continue; 780 781 /* Skip current job */ 782 if (aio->curjob) { 783 a_job = aio->curjob; 784 if (a_job->aiocb_uptr == aiocbp_list[i]) 785 continue; 786 } 787 788 /* Look for a job in the queue */ 789 TAILQ_FOREACH(a_job, &aio->jobs_queue, list) 790 if (a_job->aiocb_uptr == aiocbp_list[i]) 791 break; 792 793 if (a_job == NULL) { 794 struct aiocb aiocbp; 795 796 mutex_exit(&aio->aio_mtx); 797 798 error = copyin(aiocbp_list[i], &aiocbp, 799 sizeof(struct aiocb)); 800 if (error == 0 && aiocbp._state != JOB_DONE) { 801 mutex_enter(&aio->aio_mtx); 802 continue; 803 } 804 805 kmem_free(aiocbp_list, 806 nent * sizeof(struct aio_job)); 807 return error; 808 } 809 } 810 811 /* Wait for a signal or when timeout occurs */ 812 error = cv_timedwait_sig(&aio->done_cv, &aio->aio_mtx, timo); 813 if (error) { 814 if (error == EWOULDBLOCK) 815 error = EAGAIN; 816 break; 817 } 818 } 819 mutex_exit(&aio->aio_mtx); 820 821 kmem_free(aiocbp_list, nent * sizeof(struct aio_job)); 822 return error; 823 } 824 825 int 826 sys_aio_write(struct lwp *l, const struct sys_aio_write_args *uap, register_t *retval) 827 { 828 /* { 829 syscallarg(struct aiocb *) aiocbp; 830 } */ 831 832 return aio_enqueue_job(AIO_WRITE, SCARG(uap, aiocbp), NULL); 833 } 834 835 int 836 sys_lio_listio(struct lwp *l, const struct sys_lio_listio_args *uap, register_t *retval) 837 { 838 /* { 839 syscallarg(int) mode; 840 syscallarg(struct aiocb *const[]) list; 841 syscallarg(int) nent; 842 syscallarg(struct sigevent *) sig; 843 } */ 844 struct proc *p = l->l_proc; 845 struct aioproc *aio; 846 struct aiocb **aiocbp_list; 847 struct lio_req *lio; 848 int i, error, errcnt, mode, nent; 849 850 mode = SCARG(uap, mode); 851 nent = SCARG(uap, nent); 852 853 /* Non-accurate checks for the limit and invalid values */ 854 if (nent < 1 || nent > aio_listio_max) 855 return EINVAL; 856 if (aio_jobs_count + nent > aio_max) 857 return EAGAIN; 858 859 /* Check if AIO structure is initialized, if not - initialize it */ 860 if (p->p_aio == NULL) 861 if (aio_init(p)) 862 return EAGAIN; 863 aio = p->p_aio; 864 865 /* Create a LIO structure */ 866 lio = pool_get(&aio_lio_pool, PR_WAITOK); 867 lio->refcnt = 1; 868 error = 0; 869 870 switch (mode) { 871 case LIO_WAIT: 872 memset(&lio->sig, 0, sizeof(struct sigevent)); 873 break; 874 case LIO_NOWAIT: 875 /* Check for signal, validate it */ 876 if (SCARG(uap, sig)) { 877 struct sigevent *sig = &lio->sig; 878 879 error = copyin(SCARG(uap, sig), &lio->sig, 880 sizeof(struct sigevent)); 881 if (error == 0 && 882 (sig->sigev_signo < 0 || 883 sig->sigev_signo >= NSIG || 884 sig->sigev_notify < SIGEV_NONE || 885 sig->sigev_notify > SIGEV_SA)) 886 error = EINVAL; 887 } else 888 memset(&lio->sig, 0, sizeof(struct sigevent)); 889 break; 890 default: 891 error = EINVAL; 892 break; 893 } 894 895 if (error != 0) { 896 pool_put(&aio_lio_pool, lio); 897 return error; 898 } 899 900 /* Get the list from user-space */ 901 aiocbp_list = kmem_zalloc(nent * sizeof(struct aio_job), KM_SLEEP); 902 error = copyin(SCARG(uap, list), aiocbp_list, 903 nent * sizeof(struct aiocb)); 904 if (error) { 905 mutex_enter(&aio->aio_mtx); 906 goto err; 907 } 908 909 /* Enqueue all jobs */ 910 errcnt = 0; 911 for (i = 0; i < nent; i++) { 912 error = aio_enqueue_job(AIO_LIO, aiocbp_list[i], lio); 913 /* 914 * According to POSIX, in such error case it may 915 * fail with other I/O operations initiated. 916 */ 917 if (error) 918 errcnt++; 919 } 920 921 mutex_enter(&aio->aio_mtx); 922 923 /* Return an error, if any */ 924 if (errcnt) { 925 error = EIO; 926 goto err; 927 } 928 929 if (mode == LIO_WAIT) { 930 /* 931 * Wait for AIO completion. In such case, 932 * the LIO structure will be freed here. 933 */ 934 while (lio->refcnt > 1 && error == 0) 935 error = cv_wait_sig(&aio->done_cv, &aio->aio_mtx); 936 if (error) 937 error = EINTR; 938 } 939 940 err: 941 if (--lio->refcnt != 0) 942 lio = NULL; 943 mutex_exit(&aio->aio_mtx); 944 if (lio != NULL) { 945 aio_sendsig(p, &lio->sig); 946 pool_put(&aio_lio_pool, lio); 947 } 948 kmem_free(aiocbp_list, nent * sizeof(struct aio_job)); 949 return error; 950 } 951 952 /* 953 * SysCtl 954 */ 955 956 static int 957 sysctl_aio_listio_max(SYSCTLFN_ARGS) 958 { 959 struct sysctlnode node; 960 int error, newsize; 961 962 node = *rnode; 963 node.sysctl_data = &newsize; 964 965 newsize = aio_listio_max; 966 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 967 if (error || newp == NULL) 968 return error; 969 970 if (newsize < 1 || newsize > aio_max) 971 return EINVAL; 972 aio_listio_max = newsize; 973 974 return 0; 975 } 976 977 static int 978 sysctl_aio_max(SYSCTLFN_ARGS) 979 { 980 struct sysctlnode node; 981 int error, newsize; 982 983 node = *rnode; 984 node.sysctl_data = &newsize; 985 986 newsize = aio_max; 987 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 988 if (error || newp == NULL) 989 return error; 990 991 if (newsize < 1 || newsize < aio_listio_max) 992 return EINVAL; 993 aio_max = newsize; 994 995 return 0; 996 } 997 998 SYSCTL_SETUP(sysctl_aio_setup, "sysctl aio setup") 999 { 1000 1001 sysctl_createv(clog, 0, NULL, NULL, 1002 CTLFLAG_PERMANENT, 1003 CTLTYPE_NODE, "kern", NULL, 1004 NULL, 0, NULL, 0, 1005 CTL_KERN, CTL_EOL); 1006 sysctl_createv(clog, 0, NULL, NULL, 1007 CTLFLAG_PERMANENT | CTLFLAG_IMMEDIATE, 1008 CTLTYPE_INT, "posix_aio", 1009 SYSCTL_DESCR("Version of IEEE Std 1003.1 and its " 1010 "Asynchronous I/O option to which the " 1011 "system attempts to conform"), 1012 NULL, _POSIX_ASYNCHRONOUS_IO, NULL, 0, 1013 CTL_KERN, CTL_CREATE, CTL_EOL); 1014 sysctl_createv(clog, 0, NULL, NULL, 1015 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 1016 CTLTYPE_INT, "aio_listio_max", 1017 SYSCTL_DESCR("Maximum number of asynchronous I/O " 1018 "operations in a single list I/O call"), 1019 sysctl_aio_listio_max, 0, &aio_listio_max, 0, 1020 CTL_KERN, CTL_CREATE, CTL_EOL); 1021 sysctl_createv(clog, 0, NULL, NULL, 1022 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 1023 CTLTYPE_INT, "aio_max", 1024 SYSCTL_DESCR("Maximum number of asynchronous I/O " 1025 "operations"), 1026 sysctl_aio_max, 0, &aio_max, 0, 1027 CTL_KERN, CTL_CREATE, CTL_EOL); 1028 } 1029 1030 /* 1031 * Debugging 1032 */ 1033 #if defined(DDB) 1034 void 1035 aio_print_jobs(void (*pr)(const char *, ...)) 1036 { 1037 struct proc *p = (curlwp == NULL ? NULL : curlwp->l_proc); 1038 struct aioproc *aio; 1039 struct aio_job *a_job; 1040 struct aiocb *aiocbp; 1041 1042 if (p == NULL) { 1043 (*pr)("AIO: We are not in the processes right now.\n"); 1044 return; 1045 } 1046 1047 aio = p->p_aio; 1048 if (aio == NULL) { 1049 (*pr)("AIO data is not initialized (PID = %d).\n", p->p_pid); 1050 return; 1051 } 1052 1053 (*pr)("AIO: PID = %d\n", p->p_pid); 1054 (*pr)("AIO: Global count of the jobs = %u\n", aio_jobs_count); 1055 (*pr)("AIO: Count of the jobs = %u\n", aio->jobs_count); 1056 1057 if (aio->curjob) { 1058 a_job = aio->curjob; 1059 (*pr)("\nAIO current job:\n"); 1060 (*pr)(" opcode = %d, errno = %d, state = %d, aiocb_ptr = %p\n", 1061 a_job->aio_op, a_job->aiocbp._errno, 1062 a_job->aiocbp._state, a_job->aiocb_uptr); 1063 aiocbp = &a_job->aiocbp; 1064 (*pr)(" fd = %d, offset = %u, buf = %p, nbytes = %u\n", 1065 aiocbp->aio_fildes, aiocbp->aio_offset, 1066 aiocbp->aio_buf, aiocbp->aio_nbytes); 1067 } 1068 1069 (*pr)("\nAIO queue:\n"); 1070 TAILQ_FOREACH(a_job, &aio->jobs_queue, list) { 1071 (*pr)(" opcode = %d, errno = %d, state = %d, aiocb_ptr = %p\n", 1072 a_job->aio_op, a_job->aiocbp._errno, 1073 a_job->aiocbp._state, a_job->aiocb_uptr); 1074 aiocbp = &a_job->aiocbp; 1075 (*pr)(" fd = %d, offset = %u, buf = %p, nbytes = %u\n", 1076 aiocbp->aio_fildes, aiocbp->aio_offset, 1077 aiocbp->aio_buf, aiocbp->aio_nbytes); 1078 } 1079 } 1080 #endif /* defined(DDB) */ 1081
Indexes created Tue Sep 30 20:09:53 GMT 2025