| 1 | /* $NetBSD: sys_aio.c,v 1.41 2016/07/07 06:55:43 msaitoh 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 1.41 2016/07/07 06:55:43 msaitoh Exp $" ); |
| 36 | |
| 37 | #ifdef _KERNEL_OPT |
| 38 | #include "opt_ddb.h" |
| 39 | #endif |
| 40 | |
| 41 | #include <sys/param.h> |
| 42 | #include <sys/condvar.h> |
| 43 | #include <sys/file.h> |
| 44 | #include <sys/filedesc.h> |
| 45 | #include <sys/kernel.h> |
| 46 | #include <sys/kmem.h> |
| 47 | #include <sys/lwp.h> |
| 48 | #include <sys/mutex.h> |
| 49 | #include <sys/pool.h> |
| 50 | #include <sys/proc.h> |
| 51 | #include <sys/queue.h> |
| 52 | #include <sys/signal.h> |
| 53 | #include <sys/signalvar.h> |
| 54 | #include <sys/syscall.h> |
| 55 | #include <sys/syscallargs.h> |
| 56 | #include <sys/syscallvar.h> |
| 57 | #include <sys/sysctl.h> |
| 58 | #include <sys/systm.h> |
| 59 | #include <sys/types.h> |
| 60 | #include <sys/vnode.h> |
| 61 | #include <sys/atomic.h> |
| 62 | #include <sys/module.h> |
| 63 | #include <sys/buf.h> |
| 64 | |
| 65 | #include <uvm/uvm_extern.h> |
| 66 | |
| 67 | MODULE(MODULE_CLASS_MISC, aio, NULL); |
| 68 | |
| 69 | /* |
| 70 | * System-wide limits and counter of AIO operations. |
| 71 | */ |
| 72 | u_int aio_listio_max = AIO_LISTIO_MAX; |
| 73 | static u_int aio_max = AIO_MAX; |
| 74 | static u_int aio_jobs_count; |
| 75 | |
| 76 | static struct sysctllog *aio_sysctl; |
| 77 | static struct pool aio_job_pool; |
| 78 | static struct pool aio_lio_pool; |
| 79 | static void * aio_ehook; |
| 80 | |
| 81 | static void aio_worker(void *); |
| 82 | static void aio_process(struct aio_job *); |
| 83 | static void aio_sendsig(struct proc *, struct sigevent *); |
| 84 | static int aio_enqueue_job(int, void *, struct lio_req *); |
| 85 | static void aio_exit(proc_t *, void *); |
| 86 | |
| 87 | static int sysctl_aio_listio_max(SYSCTLFN_PROTO); |
| 88 | static int sysctl_aio_max(SYSCTLFN_PROTO); |
| 89 | static int sysctl_aio_init(void); |
| 90 | |
| 91 | static const struct syscall_package aio_syscalls[] = { |
| 92 | { SYS_aio_cancel, 0, (sy_call_t *)sys_aio_cancel }, |
| 93 | { SYS_aio_error, 0, (sy_call_t *)sys_aio_error }, |
| 94 | { SYS_aio_fsync, 0, (sy_call_t *)sys_aio_fsync }, |
| 95 | { SYS_aio_read, 0, (sy_call_t *)sys_aio_read }, |
| 96 | { SYS_aio_return, 0, (sy_call_t *)sys_aio_return }, |
| 97 | { SYS___aio_suspend50, 0, (sy_call_t *)sys___aio_suspend50 }, |
| 98 | { SYS_aio_write, 0, (sy_call_t *)sys_aio_write }, |
| 99 | { SYS_lio_listio, 0, (sy_call_t *)sys_lio_listio }, |
| 100 | { 0, 0, NULL }, |
| 101 | }; |
| 102 | |
| 103 | /* |
| 104 | * Tear down all AIO state. |
| 105 | */ |
| 106 | static int |
| 107 | aio_fini(bool interface) |
| 108 | { |
| 109 | int error; |
| 110 | proc_t *p; |
| 111 | |
| 112 | if (interface) { |
| 113 | /* Stop syscall activity. */ |
| 114 | error = syscall_disestablish(NULL, aio_syscalls); |
| 115 | if (error != 0) |
| 116 | return error; |
| 117 | /* Abort if any processes are using AIO. */ |
| 118 | mutex_enter(proc_lock); |
| 119 | PROCLIST_FOREACH(p, &allproc) { |
| 120 | if (p->p_aio != NULL) |
| 121 | break; |
| 122 | } |
| 123 | mutex_exit(proc_lock); |
| 124 | if (p != NULL) { |
| 125 | error = syscall_establish(NULL, aio_syscalls); |
| 126 | KASSERT(error == 0); |
| 127 | return EBUSY; |
| 128 | } |
| 129 | } |
| 130 | if (aio_sysctl != NULL) |
| 131 | sysctl_teardown(&aio_sysctl); |
| 132 | |
| 133 | KASSERT(aio_jobs_count == 0); |
| 134 | exithook_disestablish(aio_ehook); |
| 135 | pool_destroy(&aio_job_pool); |
| 136 | pool_destroy(&aio_lio_pool); |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * Initialize global AIO state. |
| 142 | */ |
| 143 | static int |
| 144 | aio_init(void) |
| 145 | { |
| 146 | int error; |
| 147 | |
| 148 | pool_init(&aio_job_pool, sizeof(struct aio_job), 0, 0, 0, |
| 149 | "aio_jobs_pool" , &pool_allocator_nointr, IPL_NONE); |
| 150 | pool_init(&aio_lio_pool, sizeof(struct lio_req), 0, 0, 0, |
| 151 | "aio_lio_pool" , &pool_allocator_nointr, IPL_NONE); |
| 152 | aio_ehook = exithook_establish(aio_exit, NULL); |
| 153 | |
| 154 | error = sysctl_aio_init(); |
| 155 | if (error != 0) { |
| 156 | (void)aio_fini(false); |
| 157 | return error; |
| 158 | } |
| 159 | error = syscall_establish(NULL, aio_syscalls); |
| 160 | if (error != 0) |
| 161 | (void)aio_fini(false); |
| 162 | return error; |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * Module interface. |
| 167 | */ |
| 168 | static int |
| 169 | aio_modcmd(modcmd_t cmd, void *arg) |
| 170 | { |
| 171 | |
| 172 | switch (cmd) { |
| 173 | case MODULE_CMD_INIT: |
| 174 | return aio_init(); |
| 175 | case MODULE_CMD_FINI: |
| 176 | return aio_fini(true); |
| 177 | default: |
| 178 | return ENOTTY; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Initialize Asynchronous I/O data structures for the process. |
| 184 | */ |
| 185 | static int |
| 186 | aio_procinit(struct proc *p) |
| 187 | { |
| 188 | struct aioproc *aio; |
| 189 | struct lwp *l; |
| 190 | int error; |
| 191 | vaddr_t uaddr; |
| 192 | |
| 193 | /* Allocate and initialize AIO structure */ |
| 194 | aio = kmem_zalloc(sizeof(struct aioproc), KM_SLEEP); |
| 195 | if (aio == NULL) |
| 196 | return EAGAIN; |
| 197 | |
| 198 | /* Initialize queue and their synchronization structures */ |
| 199 | mutex_init(&aio->aio_mtx, MUTEX_DEFAULT, IPL_NONE); |
| 200 | cv_init(&aio->aio_worker_cv, "aiowork" ); |
| 201 | cv_init(&aio->done_cv, "aiodone" ); |
| 202 | TAILQ_INIT(&aio->jobs_queue); |
| 203 | |
| 204 | /* |
| 205 | * Create an AIO worker thread. |
| 206 | * XXX: Currently, AIO thread is not protected against user's actions. |
| 207 | */ |
| 208 | uaddr = uvm_uarea_alloc(); |
| 209 | if (uaddr == 0) { |
| 210 | aio_exit(p, aio); |
| 211 | return EAGAIN; |
| 212 | } |
| 213 | error = lwp_create(curlwp, p, uaddr, 0, NULL, 0, aio_worker, |
| 214 | NULL, &l, curlwp->l_class); |
| 215 | if (error != 0) { |
| 216 | uvm_uarea_free(uaddr); |
| 217 | aio_exit(p, aio); |
| 218 | return error; |
| 219 | } |
| 220 | |
| 221 | /* Recheck if we are really first */ |
| 222 | mutex_enter(p->p_lock); |
| 223 | if (p->p_aio) { |
| 224 | mutex_exit(p->p_lock); |
| 225 | aio_exit(p, aio); |
| 226 | lwp_exit(l); |
| 227 | return 0; |
| 228 | } |
| 229 | p->p_aio = aio; |
| 230 | |
| 231 | /* Complete the initialization of thread, and run it */ |
| 232 | aio->aio_worker = l; |
| 233 | lwp_lock(l); |
| 234 | l->l_stat = LSRUN; |
| 235 | l->l_priority = MAXPRI_USER; |
| 236 | sched_enqueue(l, false); |
| 237 | lwp_unlock(l); |
| 238 | mutex_exit(p->p_lock); |
| 239 | |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Exit of Asynchronous I/O subsystem of process. |
| 245 | */ |
| 246 | static void |
| 247 | aio_exit(struct proc *p, void *cookie) |
| 248 | { |
| 249 | struct aio_job *a_job; |
| 250 | struct aioproc *aio; |
| 251 | |
| 252 | if (cookie != NULL) |
| 253 | aio = cookie; |
| 254 | else if ((aio = p->p_aio) == NULL) |
| 255 | return; |
| 256 | |
| 257 | /* Free AIO queue */ |
| 258 | while (!TAILQ_EMPTY(&aio->jobs_queue)) { |
| 259 | a_job = TAILQ_FIRST(&aio->jobs_queue); |
| 260 | TAILQ_REMOVE(&aio->jobs_queue, a_job, list); |
| 261 | pool_put(&aio_job_pool, a_job); |
| 262 | atomic_dec_uint(&aio_jobs_count); |
| 263 | } |
| 264 | |
| 265 | /* Destroy and free the entire AIO data structure */ |
| 266 | cv_destroy(&aio->aio_worker_cv); |
| 267 | cv_destroy(&aio->done_cv); |
| 268 | mutex_destroy(&aio->aio_mtx); |
| 269 | kmem_free(aio, sizeof(struct aioproc)); |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * AIO worker thread and processor. |
| 274 | */ |
| 275 | static void |
| 276 | aio_worker(void *arg) |
| 277 | { |
| 278 | struct proc *p = curlwp->l_proc; |
| 279 | struct aioproc *aio = p->p_aio; |
| 280 | struct aio_job *a_job; |
| 281 | struct lio_req *lio; |
| 282 | sigset_t oss, nss; |
| 283 | int error __diagused, refcnt; |
| 284 | |
| 285 | /* |
| 286 | * Make an empty signal mask, so it |
| 287 | * handles only SIGKILL and SIGSTOP. |
| 288 | */ |
| 289 | sigfillset(&nss); |
| 290 | mutex_enter(p->p_lock); |
| 291 | error = sigprocmask1(curlwp, SIG_SETMASK, &nss, &oss); |
| 292 | mutex_exit(p->p_lock); |
| 293 | KASSERT(error == 0); |
| 294 | |
| 295 | for (;;) { |
| 296 | /* |
| 297 | * Loop for each job in the queue. If there |
| 298 | * are no jobs then sleep. |
| 299 | */ |
| 300 | mutex_enter(&aio->aio_mtx); |
| 301 | while ((a_job = TAILQ_FIRST(&aio->jobs_queue)) == NULL) { |
| 302 | if (cv_wait_sig(&aio->aio_worker_cv, &aio->aio_mtx)) { |
| 303 | /* |
| 304 | * Thread was interrupted - check for |
| 305 | * pending exit or suspend. |
| 306 | */ |
| 307 | mutex_exit(&aio->aio_mtx); |
| 308 | lwp_userret(curlwp); |
| 309 | mutex_enter(&aio->aio_mtx); |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | /* Take the job from the queue */ |
| 314 | aio->curjob = a_job; |
| 315 | TAILQ_REMOVE(&aio->jobs_queue, a_job, list); |
| 316 | |
| 317 | atomic_dec_uint(&aio_jobs_count); |
| 318 | aio->jobs_count--; |
| 319 | |
| 320 | mutex_exit(&aio->aio_mtx); |
| 321 | |
| 322 | /* Process an AIO operation */ |
| 323 | aio_process(a_job); |
| 324 | |
| 325 | /* Copy data structure back to the user-space */ |
| 326 | (void)copyout(&a_job->aiocbp, a_job->aiocb_uptr, |
| 327 | sizeof(struct aiocb)); |
| 328 | |
| 329 | mutex_enter(&aio->aio_mtx); |
| 330 | KASSERT(aio->curjob == a_job); |
| 331 | aio->curjob = NULL; |
| 332 | |
| 333 | /* Decrease a reference counter, if there is a LIO structure */ |
| 334 | lio = a_job->lio; |
| 335 | refcnt = (lio != NULL ? --lio->refcnt : -1); |
| 336 | |
| 337 | /* Notify all suspenders */ |
| 338 | cv_broadcast(&aio->done_cv); |
| 339 | mutex_exit(&aio->aio_mtx); |
| 340 | |
| 341 | /* Send a signal, if any */ |
| 342 | aio_sendsig(p, &a_job->aiocbp.aio_sigevent); |
| 343 | |
| 344 | /* Destroy the LIO structure */ |
| 345 | if (refcnt == 0) { |
| 346 | aio_sendsig(p, &lio->sig); |
| 347 | pool_put(&aio_lio_pool, lio); |
| 348 | } |
| 349 | |
| 350 | /* Destroy the job */ |
| 351 | pool_put(&aio_job_pool, a_job); |
| 352 | } |
| 353 | |
| 354 | /* NOTREACHED */ |
| 355 | } |
| 356 | |
| 357 | static void |
| 358 | aio_process(struct aio_job *a_job) |
| 359 | { |
| 360 | struct proc *p = curlwp->l_proc; |
| 361 | struct aiocb *aiocbp = &a_job->aiocbp; |
| 362 | struct file *fp; |
| 363 | int fd = aiocbp->aio_fildes; |
| 364 | int error = 0; |
| 365 | |
| 366 | KASSERT(a_job->aio_op != 0); |
| 367 | |
| 368 | if ((a_job->aio_op & (AIO_READ | AIO_WRITE)) != 0) { |
| 369 | struct iovec aiov; |
| 370 | struct uio auio; |
| 371 | |
| 372 | if (aiocbp->aio_nbytes > SSIZE_MAX) { |
| 373 | error = EINVAL; |
| 374 | goto done; |
| 375 | } |
| 376 | |
| 377 | fp = fd_getfile(fd); |
| 378 | if (fp == NULL) { |
| 379 | error = EBADF; |
| 380 | goto done; |
| 381 | } |
| 382 | |
| 383 | aiov.iov_base = (void *)(uintptr_t)aiocbp->aio_buf; |
| 384 | aiov.iov_len = aiocbp->aio_nbytes; |
| 385 | auio.uio_iov = &aiov; |
| 386 | auio.uio_iovcnt = 1; |
| 387 | auio.uio_resid = aiocbp->aio_nbytes; |
| 388 | auio.uio_vmspace = p->p_vmspace; |
| 389 | |
| 390 | if (a_job->aio_op & AIO_READ) { |
| 391 | /* |
| 392 | * Perform a Read operation |
| 393 | */ |
| 394 | KASSERT((a_job->aio_op & AIO_WRITE) == 0); |
| 395 | |
| 396 | if ((fp->f_flag & FREAD) == 0) { |
| 397 | fd_putfile(fd); |
| 398 | error = EBADF; |
| 399 | goto done; |
| 400 | } |
| 401 | auio.uio_rw = UIO_READ; |
| 402 | error = (*fp->f_ops->fo_read)(fp, &aiocbp->aio_offset, |
| 403 | &auio, fp->f_cred, FOF_UPDATE_OFFSET); |
| 404 | } else { |
| 405 | /* |
| 406 | * Perform a Write operation |
| 407 | */ |
| 408 | KASSERT(a_job->aio_op & AIO_WRITE); |
| 409 | |
| 410 | if ((fp->f_flag & FWRITE) == 0) { |
| 411 | fd_putfile(fd); |
| 412 | error = EBADF; |
| 413 | goto done; |
| 414 | } |
| 415 | auio.uio_rw = UIO_WRITE; |
| 416 | error = (*fp->f_ops->fo_write)(fp, &aiocbp->aio_offset, |
| 417 | &auio, fp->f_cred, FOF_UPDATE_OFFSET); |
| 418 | } |
| 419 | fd_putfile(fd); |
| 420 | |
| 421 | /* Store the result value */ |
| 422 | a_job->aiocbp.aio_nbytes -= auio.uio_resid; |
| 423 | a_job->aiocbp._retval = (error == 0) ? |
| 424 | a_job->aiocbp.aio_nbytes : -1; |
| 425 | |
| 426 | } else if ((a_job->aio_op & (AIO_SYNC | AIO_DSYNC)) != 0) { |
| 427 | /* |
| 428 | * Perform a file Sync operation |
| 429 | */ |
| 430 | struct vnode *vp; |
| 431 | |
| 432 | if ((error = fd_getvnode(fd, &fp)) != 0) |
| 433 | goto done; |
| 434 | |
| 435 | if ((fp->f_flag & FWRITE) == 0) { |
| 436 | fd_putfile(fd); |
| 437 | error = EBADF; |
| 438 | goto done; |
| 439 | } |
| 440 | |
| 441 | vp = fp->f_vnode; |
| 442 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 443 | if (a_job->aio_op & AIO_DSYNC) { |
| 444 | error = VOP_FSYNC(vp, fp->f_cred, |
| 445 | FSYNC_WAIT | FSYNC_DATAONLY, 0, 0); |
| 446 | } else if (a_job->aio_op & AIO_SYNC) { |
| 447 | error = VOP_FSYNC(vp, fp->f_cred, |
| 448 | FSYNC_WAIT, 0, 0); |
| 449 | } |
| 450 | VOP_UNLOCK(vp); |
| 451 | fd_putfile(fd); |
| 452 | |
| 453 | /* Store the result value */ |
| 454 | a_job->aiocbp._retval = (error == 0) ? 0 : -1; |
| 455 | |
| 456 | } else |
| 457 | panic("aio_process: invalid operation code\n" ); |
| 458 | |
| 459 | done: |
| 460 | /* Job is done, set the error, if any */ |
| 461 | a_job->aiocbp._errno = error; |
| 462 | a_job->aiocbp._state = JOB_DONE; |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * Send AIO signal. |
| 467 | */ |
| 468 | static void |
| 469 | aio_sendsig(struct proc *p, struct sigevent *sig) |
| 470 | { |
| 471 | ksiginfo_t ksi; |
| 472 | |
| 473 | if (sig->sigev_signo == 0 || sig->sigev_notify == SIGEV_NONE) |
| 474 | return; |
| 475 | |
| 476 | KSI_INIT(&ksi); |
| 477 | ksi.ksi_signo = sig->sigev_signo; |
| 478 | ksi.ksi_code = SI_ASYNCIO; |
| 479 | ksi.ksi_value = sig->sigev_value; |
| 480 | mutex_enter(proc_lock); |
| 481 | kpsignal(p, &ksi, NULL); |
| 482 | mutex_exit(proc_lock); |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Enqueue the job. |
| 487 | */ |
| 488 | static int |
| 489 | aio_enqueue_job(int op, void *aiocb_uptr, struct lio_req *lio) |
| 490 | { |
| 491 | struct proc *p = curlwp->l_proc; |
| 492 | struct aioproc *aio; |
| 493 | struct aio_job *a_job; |
| 494 | struct aiocb aiocbp; |
| 495 | struct sigevent *sig; |
| 496 | int error; |
| 497 | |
| 498 | /* Non-accurate check for the limit */ |
| 499 | if (aio_jobs_count + 1 > aio_max) |
| 500 | return EAGAIN; |
| 501 | |
| 502 | /* Get the data structure from user-space */ |
| 503 | error = copyin(aiocb_uptr, &aiocbp, sizeof(struct aiocb)); |
| 504 | if (error) |
| 505 | return error; |
| 506 | |
| 507 | /* Check if signal is set, and validate it */ |
| 508 | sig = &aiocbp.aio_sigevent; |
| 509 | if (sig->sigev_signo < 0 || sig->sigev_signo >= NSIG || |
| 510 | sig->sigev_notify < SIGEV_NONE || sig->sigev_notify > SIGEV_SA) |
| 511 | return EINVAL; |
| 512 | |
| 513 | /* Buffer and byte count */ |
| 514 | if (((AIO_SYNC | AIO_DSYNC) & op) == 0) |
| 515 | if (aiocbp.aio_buf == NULL || aiocbp.aio_nbytes > SSIZE_MAX) |
| 516 | return EINVAL; |
| 517 | |
| 518 | /* Check the opcode, if LIO_NOP - simply ignore */ |
| 519 | if (op == AIO_LIO) { |
| 520 | KASSERT(lio != NULL); |
| 521 | if (aiocbp.aio_lio_opcode == LIO_WRITE) |
| 522 | op = AIO_WRITE; |
| 523 | else if (aiocbp.aio_lio_opcode == LIO_READ) |
| 524 | op = AIO_READ; |
| 525 | else |
| 526 | return (aiocbp.aio_lio_opcode == LIO_NOP) ? 0 : EINVAL; |
| 527 | } else { |
| 528 | KASSERT(lio == NULL); |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Look for already existing job. If found - the job is in-progress. |
| 533 | * According to POSIX this is invalid, so return the error. |
| 534 | */ |
| 535 | aio = p->p_aio; |
| 536 | if (aio) { |
| 537 | mutex_enter(&aio->aio_mtx); |
| 538 | TAILQ_FOREACH(a_job, &aio->jobs_queue, list) { |
| 539 | if (a_job->aiocb_uptr != aiocb_uptr) |
| 540 | continue; |
| 541 | mutex_exit(&aio->aio_mtx); |
| 542 | return EINVAL; |
| 543 | } |
| 544 | mutex_exit(&aio->aio_mtx); |
| 545 | } |
| 546 | |
| 547 | /* |
| 548 | * Check if AIO structure is initialized, if not - initialize it. |
| 549 | * In LIO case, we did that already. We will recheck this with |
| 550 | * the lock in aio_procinit(). |
| 551 | */ |
| 552 | if (lio == NULL && p->p_aio == NULL) |
| 553 | if (aio_procinit(p)) |
| 554 | return EAGAIN; |
| 555 | aio = p->p_aio; |
| 556 | |
| 557 | /* |
| 558 | * Set the state with errno, and copy data |
| 559 | * structure back to the user-space. |
| 560 | */ |
| 561 | aiocbp._state = JOB_WIP; |
| 562 | aiocbp._errno = EINPROGRESS; |
| 563 | aiocbp._retval = -1; |
| 564 | error = copyout(&aiocbp, aiocb_uptr, sizeof(struct aiocb)); |
| 565 | if (error) |
| 566 | return error; |
| 567 | |
| 568 | /* Allocate and initialize a new AIO job */ |
| 569 | a_job = pool_get(&aio_job_pool, PR_WAITOK); |
| 570 | memset(a_job, 0, sizeof(struct aio_job)); |
| 571 | |
| 572 | /* |
| 573 | * Set the data. |
| 574 | * Store the user-space pointer for searching. Since we |
| 575 | * are storing only per proc pointers - it is safe. |
| 576 | */ |
| 577 | memcpy(&a_job->aiocbp, &aiocbp, sizeof(struct aiocb)); |
| 578 | a_job->aiocb_uptr = aiocb_uptr; |
| 579 | a_job->aio_op |= op; |
| 580 | a_job->lio = lio; |
| 581 | |
| 582 | /* |
| 583 | * Add the job to the queue, update the counters, and |
| 584 | * notify the AIO worker thread to handle the job. |
| 585 | */ |
| 586 | mutex_enter(&aio->aio_mtx); |
| 587 | |
| 588 | /* Fail, if the limit was reached */ |
| 589 | if (atomic_inc_uint_nv(&aio_jobs_count) > aio_max || |
| 590 | aio->jobs_count >= aio_listio_max) { |
| 591 | atomic_dec_uint(&aio_jobs_count); |
| 592 | mutex_exit(&aio->aio_mtx); |
| 593 | pool_put(&aio_job_pool, a_job); |
| 594 | return EAGAIN; |
| 595 | } |
| 596 | |
| 597 | TAILQ_INSERT_TAIL(&aio->jobs_queue, a_job, list); |
| 598 | aio->jobs_count++; |
| 599 | if (lio) |
| 600 | lio->refcnt++; |
| 601 | cv_signal(&aio->aio_worker_cv); |
| 602 | |
| 603 | mutex_exit(&aio->aio_mtx); |
| 604 | |
| 605 | /* |
| 606 | * One would handle the errors only with aio_error() function. |
| 607 | * This way is appropriate according to POSIX. |
| 608 | */ |
| 609 | return 0; |
| 610 | } |
| 611 | |
| 612 | /* |
| 613 | * Syscall functions. |
| 614 | */ |
| 615 | |
| 616 | int |
| 617 | sys_aio_cancel(struct lwp *l, const struct sys_aio_cancel_args *uap, |
| 618 | register_t *retval) |
| 619 | { |
| 620 | /* { |
| 621 | syscallarg(int) fildes; |
| 622 | syscallarg(struct aiocb *) aiocbp; |
| 623 | } */ |
| 624 | struct proc *p = l->l_proc; |
| 625 | struct aioproc *aio; |
| 626 | struct aio_job *a_job; |
| 627 | struct aiocb *aiocbp_ptr; |
| 628 | struct lio_req *lio; |
| 629 | struct filedesc *fdp = p->p_fd; |
| 630 | unsigned int cn, errcnt, fildes; |
| 631 | fdtab_t *dt; |
| 632 | |
| 633 | TAILQ_HEAD(, aio_job) tmp_jobs_list; |
| 634 | |
| 635 | /* Check for invalid file descriptor */ |
| 636 | fildes = (unsigned int)SCARG(uap, fildes); |
| 637 | dt = fdp->fd_dt; |
| 638 | if (fildes >= dt->dt_nfiles) |
| 639 | return EBADF; |
| 640 | if (dt->dt_ff[fildes] == NULL || dt->dt_ff[fildes]->ff_file == NULL) |
| 641 | return EBADF; |
| 642 | |
| 643 | /* Check if AIO structure is initialized */ |
| 644 | if (p->p_aio == NULL) { |
| 645 | *retval = AIO_NOTCANCELED; |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | aio = p->p_aio; |
| 650 | aiocbp_ptr = (struct aiocb *)SCARG(uap, aiocbp); |
| 651 | |
| 652 | mutex_enter(&aio->aio_mtx); |
| 653 | |
| 654 | /* Cancel the jobs, and remove them from the queue */ |
| 655 | cn = 0; |
| 656 | TAILQ_INIT(&tmp_jobs_list); |
| 657 | TAILQ_FOREACH(a_job, &aio->jobs_queue, list) { |
| 658 | if (aiocbp_ptr) { |
| 659 | if (aiocbp_ptr != a_job->aiocb_uptr) |
| 660 | continue; |
| 661 | if (fildes != a_job->aiocbp.aio_fildes) { |
| 662 | mutex_exit(&aio->aio_mtx); |
| 663 | return EBADF; |
| 664 | } |
| 665 | } else if (a_job->aiocbp.aio_fildes != fildes) |
| 666 | continue; |
| 667 | |
| 668 | TAILQ_REMOVE(&aio->jobs_queue, a_job, list); |
| 669 | TAILQ_INSERT_TAIL(&tmp_jobs_list, a_job, list); |
| 670 | |
| 671 | /* Decrease the counters */ |
| 672 | atomic_dec_uint(&aio_jobs_count); |
| 673 | aio->jobs_count--; |
| 674 | lio = a_job->lio; |
| 675 | if (lio != NULL && --lio->refcnt != 0) |
| 676 | a_job->lio = NULL; |
| 677 | |
| 678 | cn++; |
| 679 | if (aiocbp_ptr) |
| 680 | break; |
| 681 | } |
| 682 | |
| 683 | /* There are canceled jobs */ |
| 684 | if (cn) |
| 685 | *retval = AIO_CANCELED; |
| 686 | |
| 687 | /* We cannot cancel current job */ |
| 688 | a_job = aio->curjob; |
| 689 | if (a_job && ((a_job->aiocbp.aio_fildes == fildes) || |
| 690 | (a_job->aiocb_uptr == aiocbp_ptr))) |
| 691 | *retval = AIO_NOTCANCELED; |
| 692 | |
| 693 | mutex_exit(&aio->aio_mtx); |
| 694 | |
| 695 | /* Free the jobs after the lock */ |
| 696 | errcnt = 0; |
| 697 | while (!TAILQ_EMPTY(&tmp_jobs_list)) { |
| 698 | a_job = TAILQ_FIRST(&tmp_jobs_list); |
| 699 | TAILQ_REMOVE(&tmp_jobs_list, a_job, list); |
| 700 | /* Set the errno and copy structures back to the user-space */ |
| 701 | a_job->aiocbp._errno = ECANCELED; |
| 702 | a_job->aiocbp._state = JOB_DONE; |
| 703 | if (copyout(&a_job->aiocbp, a_job->aiocb_uptr, |
| 704 | sizeof(struct aiocb))) |
| 705 | errcnt++; |
| 706 | /* Send a signal if any */ |
| 707 | aio_sendsig(p, &a_job->aiocbp.aio_sigevent); |
| 708 | if (a_job->lio) { |
| 709 | lio = a_job->lio; |
| 710 | aio_sendsig(p, &lio->sig); |
| 711 | pool_put(&aio_lio_pool, lio); |
| 712 | } |
| 713 | pool_put(&aio_job_pool, a_job); |
| 714 | } |
| 715 | |
| 716 | if (errcnt) |
| 717 | return EFAULT; |
| 718 | |
| 719 | /* Set a correct return value */ |
| 720 | if (*retval == 0) |
| 721 | *retval = AIO_ALLDONE; |
| 722 | |
| 723 | return 0; |
| 724 | } |
| 725 | |
| 726 | int |
| 727 | sys_aio_error(struct lwp *l, const struct sys_aio_error_args *uap, |
| 728 | register_t *retval) |
| 729 | { |
| 730 | /* { |
| 731 | syscallarg(const struct aiocb *) aiocbp; |
| 732 | } */ |
| 733 | struct proc *p = l->l_proc; |
| 734 | struct aioproc *aio = p->p_aio; |
| 735 | struct aiocb aiocbp; |
| 736 | int error; |
| 737 | |
| 738 | if (aio == NULL) |
| 739 | return EINVAL; |
| 740 | |
| 741 | error = copyin(SCARG(uap, aiocbp), &aiocbp, sizeof(struct aiocb)); |
| 742 | if (error) |
| 743 | return error; |
| 744 | |
| 745 | if (aiocbp._state == JOB_NONE) |
| 746 | return EINVAL; |
| 747 | |
| 748 | *retval = aiocbp._errno; |
| 749 | |
| 750 | return 0; |
| 751 | } |
| 752 | |
| 753 | int |
| 754 | sys_aio_fsync(struct lwp *l, const struct sys_aio_fsync_args *uap, |
| 755 | register_t *retval) |
| 756 | { |
| 757 | /* { |
| 758 | syscallarg(int) op; |
| 759 | syscallarg(struct aiocb *) aiocbp; |
| 760 | } */ |
| 761 | int op = SCARG(uap, op); |
| 762 | |
| 763 | if ((op != O_DSYNC) && (op != O_SYNC)) |
| 764 | return EINVAL; |
| 765 | |
| 766 | op = O_DSYNC ? AIO_DSYNC : AIO_SYNC; |
| 767 | |
| 768 | return aio_enqueue_job(op, SCARG(uap, aiocbp), NULL); |
| 769 | } |
| 770 | |
| 771 | int |
| 772 | sys_aio_read(struct lwp *l, const struct sys_aio_read_args *uap, |
| 773 | register_t *retval) |
| 774 | { |
| 775 | /* { |
| 776 | syscallarg(struct aiocb *) aiocbp; |
| 777 | } */ |
| 778 | |
| 779 | return aio_enqueue_job(AIO_READ, SCARG(uap, aiocbp), NULL); |
| 780 | } |
| 781 | |
| 782 | int |
| 783 | sys_aio_return(struct lwp *l, const struct sys_aio_return_args *uap, |
| 784 | register_t *retval) |
| 785 | { |
| 786 | /* { |
| 787 | syscallarg(struct aiocb *) aiocbp; |
| 788 | } */ |
| 789 | struct proc *p = l->l_proc; |
| 790 | struct aioproc *aio = p->p_aio; |
| 791 | struct aiocb aiocbp; |
| 792 | int error; |
| 793 | |
| 794 | if (aio == NULL) |
| 795 | return EINVAL; |
| 796 | |
| 797 | error = copyin(SCARG(uap, aiocbp), &aiocbp, sizeof(struct aiocb)); |
| 798 | if (error) |
| 799 | return error; |
| 800 | |
| 801 | if (aiocbp._errno == EINPROGRESS || aiocbp._state != JOB_DONE) |
| 802 | return EINVAL; |
| 803 | |
| 804 | *retval = aiocbp._retval; |
| 805 | |
| 806 | /* Reset the internal variables */ |
| 807 | aiocbp._errno = 0; |
| 808 | aiocbp._retval = -1; |
| 809 | aiocbp._state = JOB_NONE; |
| 810 | error = copyout(&aiocbp, SCARG(uap, aiocbp), sizeof(struct aiocb)); |
| 811 | |
| 812 | return error; |
| 813 | } |
| 814 | |
| 815 | int |
| 816 | sys___aio_suspend50(struct lwp *l, const struct sys___aio_suspend50_args *uap, |
| 817 | register_t *retval) |
| 818 | { |
| 819 | /* { |
| 820 | syscallarg(const struct aiocb *const[]) list; |
| 821 | syscallarg(int) nent; |
| 822 | syscallarg(const struct timespec *) timeout; |
| 823 | } */ |
| 824 | struct aiocb **list; |
| 825 | struct timespec ts; |
| 826 | int error, nent; |
| 827 | |
| 828 | nent = SCARG(uap, nent); |
| 829 | if (nent <= 0 || nent > aio_listio_max) |
| 830 | return EAGAIN; |
| 831 | |
| 832 | if (SCARG(uap, timeout)) { |
| 833 | /* Convert timespec to ticks */ |
| 834 | error = copyin(SCARG(uap, timeout), &ts, |
| 835 | sizeof(struct timespec)); |
| 836 | if (error) |
| 837 | return error; |
| 838 | } |
| 839 | |
| 840 | list = kmem_alloc(nent * sizeof(*list), KM_SLEEP); |
| 841 | error = copyin(SCARG(uap, list), list, nent * sizeof(*list)); |
| 842 | if (error) |
| 843 | goto out; |
| 844 | error = aio_suspend1(l, list, nent, SCARG(uap, timeout) ? &ts : NULL); |
| 845 | out: |
| 846 | kmem_free(list, nent * sizeof(*list)); |
| 847 | return error; |
| 848 | } |
| 849 | |
| 850 | int |
| 851 | aio_suspend1(struct lwp *l, struct aiocb **aiocbp_list, int nent, |
| 852 | struct timespec *ts) |
| 853 | { |
| 854 | struct proc *p = l->l_proc; |
| 855 | struct aioproc *aio; |
| 856 | struct aio_job *a_job; |
| 857 | int i, error, timo; |
| 858 | |
| 859 | if (p->p_aio == NULL) |
| 860 | return EAGAIN; |
| 861 | aio = p->p_aio; |
| 862 | |
| 863 | if (ts) { |
| 864 | timo = mstohz((ts->tv_sec * 1000) + (ts->tv_nsec / 1000000)); |
| 865 | if (timo == 0 && ts->tv_sec == 0 && ts->tv_nsec > 0) |
| 866 | timo = 1; |
| 867 | if (timo <= 0) |
| 868 | return EAGAIN; |
| 869 | } else |
| 870 | timo = 0; |
| 871 | |
| 872 | mutex_enter(&aio->aio_mtx); |
| 873 | for (;;) { |
| 874 | for (i = 0; i < nent; i++) { |
| 875 | |
| 876 | /* Skip NULL entries */ |
| 877 | if (aiocbp_list[i] == NULL) |
| 878 | continue; |
| 879 | |
| 880 | /* Skip current job */ |
| 881 | if (aio->curjob) { |
| 882 | a_job = aio->curjob; |
| 883 | if (a_job->aiocb_uptr == aiocbp_list[i]) |
| 884 | continue; |
| 885 | } |
| 886 | |
| 887 | /* Look for a job in the queue */ |
| 888 | TAILQ_FOREACH(a_job, &aio->jobs_queue, list) |
| 889 | if (a_job->aiocb_uptr == aiocbp_list[i]) |
| 890 | break; |
| 891 | |
| 892 | if (a_job == NULL) { |
| 893 | struct aiocb aiocbp; |
| 894 | |
| 895 | mutex_exit(&aio->aio_mtx); |
| 896 | |
| 897 | /* Check if the job is done. */ |
| 898 | error = copyin(aiocbp_list[i], &aiocbp, |
| 899 | sizeof(struct aiocb)); |
| 900 | if (error == 0 && aiocbp._state != JOB_DONE) { |
| 901 | mutex_enter(&aio->aio_mtx); |
| 902 | continue; |
| 903 | } |
| 904 | return error; |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | /* Wait for a signal or when timeout occurs */ |
| 909 | error = cv_timedwait_sig(&aio->done_cv, &aio->aio_mtx, timo); |
| 910 | if (error) { |
| 911 | if (error == EWOULDBLOCK) |
| 912 | error = EAGAIN; |
| 913 | break; |
| 914 | } |
| 915 | } |
| 916 | mutex_exit(&aio->aio_mtx); |
| 917 | return error; |
| 918 | } |
| 919 | |
| 920 | int |
| 921 | sys_aio_write(struct lwp *l, const struct sys_aio_write_args *uap, |
| 922 | register_t *retval) |
| 923 | { |
| 924 | /* { |
| 925 | syscallarg(struct aiocb *) aiocbp; |
| 926 | } */ |
| 927 | |
| 928 | return aio_enqueue_job(AIO_WRITE, SCARG(uap, aiocbp), NULL); |
| 929 | } |
| 930 | |
| 931 | int |
| 932 | sys_lio_listio(struct lwp *l, const struct sys_lio_listio_args *uap, |
| 933 | register_t *retval) |
| 934 | { |
| 935 | /* { |
| 936 | syscallarg(int) mode; |
| 937 | syscallarg(struct aiocb *const[]) list; |
| 938 | syscallarg(int) nent; |
| 939 | syscallarg(struct sigevent *) sig; |
| 940 | } */ |
| 941 | struct proc *p = l->l_proc; |
| 942 | struct aioproc *aio; |
| 943 | struct aiocb **aiocbp_list; |
| 944 | struct lio_req *lio; |
| 945 | int i, error, errcnt, mode, nent; |
| 946 | |
| 947 | mode = SCARG(uap, mode); |
| 948 | nent = SCARG(uap, nent); |
| 949 | |
| 950 | /* Non-accurate checks for the limit and invalid values */ |
| 951 | if (nent < 1 || nent > aio_listio_max) |
| 952 | return EINVAL; |
| 953 | if (aio_jobs_count + nent > aio_max) |
| 954 | return EAGAIN; |
| 955 | |
| 956 | /* Check if AIO structure is initialized, if not - initialize it */ |
| 957 | if (p->p_aio == NULL) |
| 958 | if (aio_procinit(p)) |
| 959 | return EAGAIN; |
| 960 | aio = p->p_aio; |
| 961 | |
| 962 | /* Create a LIO structure */ |
| 963 | lio = pool_get(&aio_lio_pool, PR_WAITOK); |
| 964 | lio->refcnt = 1; |
| 965 | error = 0; |
| 966 | |
| 967 | switch (mode) { |
| 968 | case LIO_WAIT: |
| 969 | memset(&lio->sig, 0, sizeof(struct sigevent)); |
| 970 | break; |
| 971 | case LIO_NOWAIT: |
| 972 | /* Check for signal, validate it */ |
| 973 | if (SCARG(uap, sig)) { |
| 974 | struct sigevent *sig = &lio->sig; |
| 975 | |
| 976 | error = copyin(SCARG(uap, sig), &lio->sig, |
| 977 | sizeof(struct sigevent)); |
| 978 | if (error == 0 && |
| 979 | (sig->sigev_signo < 0 || |
| 980 | sig->sigev_signo >= NSIG || |
| 981 | sig->sigev_notify < SIGEV_NONE || |
| 982 | sig->sigev_notify > SIGEV_SA)) |
| 983 | error = EINVAL; |
| 984 | } else |
| 985 | memset(&lio->sig, 0, sizeof(struct sigevent)); |
| 986 | break; |
| 987 | default: |
| 988 | error = EINVAL; |
| 989 | break; |
| 990 | } |
| 991 | |
| 992 | if (error != 0) { |
| 993 | pool_put(&aio_lio_pool, lio); |
| 994 | return error; |
| 995 | } |
| 996 | |
| 997 | /* Get the list from user-space */ |
| 998 | aiocbp_list = kmem_alloc(nent * sizeof(*aiocbp_list), KM_SLEEP); |
| 999 | error = copyin(SCARG(uap, list), aiocbp_list, |
| 1000 | nent * sizeof(*aiocbp_list)); |
| 1001 | if (error) { |
| 1002 | mutex_enter(&aio->aio_mtx); |
| 1003 | goto err; |
| 1004 | } |
| 1005 | |
| 1006 | /* Enqueue all jobs */ |
| 1007 | errcnt = 0; |
| 1008 | for (i = 0; i < nent; i++) { |
| 1009 | error = aio_enqueue_job(AIO_LIO, aiocbp_list[i], lio); |
| 1010 | /* |
| 1011 | * According to POSIX, in such error case it may |
| 1012 | * fail with other I/O operations initiated. |
| 1013 | */ |
| 1014 | if (error) |
| 1015 | errcnt++; |
| 1016 | } |
| 1017 | |
| 1018 | mutex_enter(&aio->aio_mtx); |
| 1019 | |
| 1020 | /* Return an error, if any */ |
| 1021 | if (errcnt) { |
| 1022 | error = EIO; |
| 1023 | goto err; |
| 1024 | } |
| 1025 | |
| 1026 | if (mode == LIO_WAIT) { |
| 1027 | /* |
| 1028 | * Wait for AIO completion. In such case, |
| 1029 | * the LIO structure will be freed here. |
| 1030 | */ |
| 1031 | while (lio->refcnt > 1 && error == 0) |
| 1032 | error = cv_wait_sig(&aio->done_cv, &aio->aio_mtx); |
| 1033 | if (error) |
| 1034 | error = EINTR; |
| 1035 | } |
| 1036 | |
| 1037 | err: |
| 1038 | if (--lio->refcnt != 0) |
| 1039 | lio = NULL; |
| 1040 | mutex_exit(&aio->aio_mtx); |
| 1041 | if (lio != NULL) { |
| 1042 | aio_sendsig(p, &lio->sig); |
| 1043 | pool_put(&aio_lio_pool, lio); |
| 1044 | } |
| 1045 | kmem_free(aiocbp_list, nent * sizeof(*aiocbp_list)); |
| 1046 | return error; |
| 1047 | } |
| 1048 | |
| 1049 | /* |
| 1050 | * SysCtl |
| 1051 | */ |
| 1052 | |
| 1053 | static int |
| 1054 | sysctl_aio_listio_max(SYSCTLFN_ARGS) |
| 1055 | { |
| 1056 | struct sysctlnode node; |
| 1057 | int error, newsize; |
| 1058 | |
| 1059 | node = *rnode; |
| 1060 | node.sysctl_data = &newsize; |
| 1061 | |
| 1062 | newsize = aio_listio_max; |
| 1063 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 1064 | if (error || newp == NULL) |
| 1065 | return error; |
| 1066 | |
| 1067 | if (newsize < 1 || newsize > aio_max) |
| 1068 | return EINVAL; |
| 1069 | aio_listio_max = newsize; |
| 1070 | |
| 1071 | return 0; |
| 1072 | } |
| 1073 | |
| 1074 | static int |
| 1075 | sysctl_aio_max(SYSCTLFN_ARGS) |
| 1076 | { |
| 1077 | struct sysctlnode node; |
| 1078 | int error, newsize; |
| 1079 | |
| 1080 | node = *rnode; |
| 1081 | node.sysctl_data = &newsize; |
| 1082 | |
| 1083 | newsize = aio_max; |
| 1084 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 1085 | if (error || newp == NULL) |
| 1086 | return error; |
| 1087 | |
| 1088 | if (newsize < 1 || newsize < aio_listio_max) |
| 1089 | return EINVAL; |
| 1090 | aio_max = newsize; |
| 1091 | |
| 1092 | return 0; |
| 1093 | } |
| 1094 | |
| 1095 | static int |
| 1096 | sysctl_aio_init(void) |
| 1097 | { |
| 1098 | int rv; |
| 1099 | |
| 1100 | aio_sysctl = NULL; |
| 1101 | |
| 1102 | rv = sysctl_createv(&aio_sysctl, 0, NULL, NULL, |
| 1103 | CTLFLAG_PERMANENT | CTLFLAG_IMMEDIATE, |
| 1104 | CTLTYPE_INT, "posix_aio" , |
| 1105 | SYSCTL_DESCR("Version of IEEE Std 1003.1 and its " |
| 1106 | "Asynchronous I/O option to which the " |
| 1107 | "system attempts to conform" ), |
| 1108 | NULL, _POSIX_ASYNCHRONOUS_IO, NULL, 0, |
| 1109 | CTL_KERN, CTL_CREATE, CTL_EOL); |
| 1110 | |
| 1111 | if (rv != 0) |
| 1112 | return rv; |
| 1113 | |
| 1114 | rv = sysctl_createv(&aio_sysctl, 0, NULL, NULL, |
| 1115 | CTLFLAG_PERMANENT | CTLFLAG_READWRITE, |
| 1116 | CTLTYPE_INT, "aio_listio_max" , |
| 1117 | SYSCTL_DESCR("Maximum number of asynchronous I/O " |
| 1118 | "operations in a single list I/O call" ), |
| 1119 | sysctl_aio_listio_max, 0, &aio_listio_max, 0, |
| 1120 | CTL_KERN, CTL_CREATE, CTL_EOL); |
| 1121 | |
| 1122 | if (rv != 0) |
| 1123 | return rv; |
| 1124 | |
| 1125 | rv = sysctl_createv(&aio_sysctl, 0, NULL, NULL, |
| 1126 | CTLFLAG_PERMANENT | CTLFLAG_READWRITE, |
| 1127 | CTLTYPE_INT, "aio_max" , |
| 1128 | SYSCTL_DESCR("Maximum number of asynchronous I/O " |
| 1129 | "operations" ), |
| 1130 | sysctl_aio_max, 0, &aio_max, 0, |
| 1131 | CTL_KERN, CTL_CREATE, CTL_EOL); |
| 1132 | |
| 1133 | return rv; |
| 1134 | } |
| 1135 | |
| 1136 | /* |
| 1137 | * Debugging |
| 1138 | */ |
| 1139 | #if defined(DDB) |
| 1140 | void |
| 1141 | aio_print_jobs(void (*pr)(const char *, ...)) |
| 1142 | { |
| 1143 | struct proc *p = curlwp->l_proc; |
| 1144 | struct aioproc *aio; |
| 1145 | struct aio_job *a_job; |
| 1146 | struct aiocb *aiocbp; |
| 1147 | |
| 1148 | if (p == NULL) { |
| 1149 | (*pr)("AIO: We are not in the processes right now.\n" ); |
| 1150 | return; |
| 1151 | } |
| 1152 | |
| 1153 | aio = p->p_aio; |
| 1154 | if (aio == NULL) { |
| 1155 | (*pr)("AIO data is not initialized (PID = %d).\n" , p->p_pid); |
| 1156 | return; |
| 1157 | } |
| 1158 | |
| 1159 | (*pr)("AIO: PID = %d\n" , p->p_pid); |
| 1160 | (*pr)("AIO: Global count of the jobs = %u\n" , aio_jobs_count); |
| 1161 | (*pr)("AIO: Count of the jobs = %u\n" , aio->jobs_count); |
| 1162 | |
| 1163 | if (aio->curjob) { |
| 1164 | a_job = aio->curjob; |
| 1165 | (*pr)("\nAIO current job:\n" ); |
| 1166 | (*pr)(" opcode = %d, errno = %d, state = %d, aiocb_ptr = %p\n" , |
| 1167 | a_job->aio_op, a_job->aiocbp._errno, |
| 1168 | a_job->aiocbp._state, a_job->aiocb_uptr); |
| 1169 | aiocbp = &a_job->aiocbp; |
| 1170 | (*pr)(" fd = %d, offset = %u, buf = %p, nbytes = %u\n" , |
| 1171 | aiocbp->aio_fildes, aiocbp->aio_offset, |
| 1172 | aiocbp->aio_buf, aiocbp->aio_nbytes); |
| 1173 | } |
| 1174 | |
| 1175 | (*pr)("\nAIO queue:\n" ); |
| 1176 | TAILQ_FOREACH(a_job, &aio->jobs_queue, list) { |
| 1177 | (*pr)(" opcode = %d, errno = %d, state = %d, aiocb_ptr = %p\n" , |
| 1178 | a_job->aio_op, a_job->aiocbp._errno, |
| 1179 | a_job->aiocbp._state, a_job->aiocb_uptr); |
| 1180 | aiocbp = &a_job->aiocbp; |
| 1181 | (*pr)(" fd = %d, offset = %u, buf = %p, nbytes = %u\n" , |
| 1182 | aiocbp->aio_fildes, aiocbp->aio_offset, |
| 1183 | aiocbp->aio_buf, aiocbp->aio_nbytes); |
| 1184 | } |
| 1185 | } |
| 1186 | #endif /* defined(DDB) */ |
| 1187 | |