1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1990, 1993 5 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/aio.h> 35 #include <sys/domain.h> 36 #include <sys/file.h> 37 #include <sys/filedesc.h> 38 #include <sys/kernel.h> 39 #include <sys/kthread.h> 40 #include <sys/malloc.h> 41 #include <sys/proc.h> 42 #include <sys/protosw.h> 43 #include <sys/sigio.h> 44 #include <sys/signal.h> 45 #include <sys/signalvar.h> 46 #include <sys/socket.h> 47 #include <sys/socketvar.h> 48 #include <sys/filio.h> /* XXX */ 49 #include <sys/sockio.h> 50 #include <sys/stat.h> 51 #include <sys/sysctl.h> 52 #include <sys/sysproto.h> 53 #include <sys/taskqueue.h> 54 #include <sys/uio.h> 55 #include <sys/ucred.h> 56 #include <sys/un.h> 57 #include <sys/unpcb.h> 58 #include <sys/user.h> 59 60 #include <net/if.h> 61 #include <net/if_var.h> 62 #include <net/route.h> 63 #include <net/vnet.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_pcb.h> 67 68 #include <security/mac/mac_framework.h> 69 70 #include <vm/vm.h> 71 #include <vm/pmap.h> 72 #include <vm/vm_extern.h> 73 #include <vm/vm_map.h> 74 75 static SYSCTL_NODE(_kern_ipc, OID_AUTO, aio, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 76 "socket AIO stats"); 77 78 static int empty_results; 79 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_results, CTLFLAG_RD, &empty_results, 80 0, "socket operation returned EAGAIN"); 81 82 static int empty_retries; 83 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_retries, CTLFLAG_RD, &empty_retries, 84 0, "socket operation retries"); 85 86 static fo_rdwr_t soo_read; 87 static fo_rdwr_t soo_write; 88 static fo_ioctl_t soo_ioctl; 89 static fo_poll_t soo_poll; 90 extern fo_kqfilter_t soo_kqfilter; 91 static fo_stat_t soo_stat; 92 static fo_close_t soo_close; 93 static fo_fill_kinfo_t soo_fill_kinfo; 94 static fo_aio_queue_t soo_aio_queue; 95 96 static void soo_aio_cancel(struct kaiocb *job); 97 98 struct fileops socketops = { 99 .fo_read = soo_read, 100 .fo_write = soo_write, 101 .fo_truncate = invfo_truncate, 102 .fo_ioctl = soo_ioctl, 103 .fo_poll = soo_poll, 104 .fo_kqfilter = soo_kqfilter, 105 .fo_stat = soo_stat, 106 .fo_close = soo_close, 107 .fo_chmod = invfo_chmod, 108 .fo_chown = invfo_chown, 109 .fo_sendfile = invfo_sendfile, 110 .fo_fill_kinfo = soo_fill_kinfo, 111 .fo_aio_queue = soo_aio_queue, 112 .fo_cmp = file_kcmp_generic, 113 .fo_flags = DFLAG_PASSABLE 114 }; 115 116 static int 117 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 118 int flags, struct thread *td) 119 { 120 struct socket *so = fp->f_data; 121 int error; 122 123 #ifdef MAC 124 error = mac_socket_check_receive(active_cred, so); 125 if (error) 126 return (error); 127 #endif 128 error = soreceive(so, 0, uio, 0, 0, 0); 129 return (error); 130 } 131 132 static int 133 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 134 int flags, struct thread *td) 135 { 136 struct socket *so = fp->f_data; 137 int error; 138 139 #ifdef MAC 140 error = mac_socket_check_send(active_cred, so); 141 if (error) 142 return (error); 143 #endif 144 error = sousrsend(so, NULL, uio, NULL, 0, NULL); 145 return (error); 146 } 147 148 static int 149 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 150 struct thread *td) 151 { 152 struct socket *so = fp->f_data; 153 int error = 0; 154 155 switch (cmd) { 156 case FIONBIO: 157 SOCK_LOCK(so); 158 if (*(int *)data) 159 so->so_state |= SS_NBIO; 160 else 161 so->so_state &= ~SS_NBIO; 162 SOCK_UNLOCK(so); 163 break; 164 165 case FIOASYNC: 166 if (*(int *)data) { 167 SOCK_LOCK(so); 168 so->so_state |= SS_ASYNC; 169 if (SOLISTENING(so)) { 170 so->sol_sbrcv_flags |= SB_ASYNC; 171 so->sol_sbsnd_flags |= SB_ASYNC; 172 } else { 173 SOCK_RECVBUF_LOCK(so); 174 so->so_rcv.sb_flags |= SB_ASYNC; 175 SOCK_RECVBUF_UNLOCK(so); 176 SOCK_SENDBUF_LOCK(so); 177 so->so_snd.sb_flags |= SB_ASYNC; 178 SOCK_SENDBUF_UNLOCK(so); 179 } 180 SOCK_UNLOCK(so); 181 } else { 182 SOCK_LOCK(so); 183 so->so_state &= ~SS_ASYNC; 184 if (SOLISTENING(so)) { 185 so->sol_sbrcv_flags &= ~SB_ASYNC; 186 so->sol_sbsnd_flags &= ~SB_ASYNC; 187 } else { 188 SOCK_RECVBUF_LOCK(so); 189 so->so_rcv.sb_flags &= ~SB_ASYNC; 190 SOCK_RECVBUF_UNLOCK(so); 191 SOCK_SENDBUF_LOCK(so); 192 so->so_snd.sb_flags &= ~SB_ASYNC; 193 SOCK_SENDBUF_UNLOCK(so); 194 } 195 SOCK_UNLOCK(so); 196 } 197 break; 198 199 case FIONREAD: 200 SOCK_RECVBUF_LOCK(so); 201 if (SOLISTENING(so)) { 202 error = EINVAL; 203 } else { 204 *(int *)data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl; 205 } 206 SOCK_RECVBUF_UNLOCK(so); 207 break; 208 209 case FIONWRITE: 210 /* Unlocked read. */ 211 if (SOLISTENING(so)) { 212 error = EINVAL; 213 } else { 214 *(int *)data = sbavail(&so->so_snd); 215 } 216 break; 217 218 case FIONSPACE: 219 /* Unlocked read. */ 220 if (SOLISTENING(so)) { 221 error = EINVAL; 222 } else { 223 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) || 224 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) { 225 *(int *)data = 0; 226 } else { 227 *(int *)data = sbspace(&so->so_snd); 228 } 229 } 230 break; 231 232 case FIOSETOWN: 233 error = fsetown(*(int *)data, &so->so_sigio); 234 break; 235 236 case FIOGETOWN: 237 *(int *)data = fgetown(&so->so_sigio); 238 break; 239 240 case SIOCSPGRP: 241 error = fsetown(-(*(int *)data), &so->so_sigio); 242 break; 243 244 case SIOCGPGRP: 245 *(int *)data = -fgetown(&so->so_sigio); 246 break; 247 248 case SIOCATMARK: 249 /* Unlocked read. */ 250 if (SOLISTENING(so)) { 251 error = EINVAL; 252 } else { 253 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 254 } 255 break; 256 default: 257 /* 258 * Interface/routing/protocol specific ioctls: interface and 259 * routing ioctls should have a different entry since a 260 * socket is unnecessary. 261 */ 262 if (IOCGROUP(cmd) == 'i') 263 error = ifioctl(so, cmd, data, td); 264 else if (IOCGROUP(cmd) == 'r') { 265 CURVNET_SET(so->so_vnet); 266 error = rtioctl_fib(cmd, data, so->so_fibnum); 267 CURVNET_RESTORE(); 268 } else { 269 CURVNET_SET(so->so_vnet); 270 error = so->so_proto->pr_control(so, cmd, data, 0, td); 271 CURVNET_RESTORE(); 272 } 273 break; 274 } 275 return (error); 276 } 277 278 static int 279 soo_poll(struct file *fp, int events, struct ucred *active_cred, 280 struct thread *td) 281 { 282 struct socket *so = fp->f_data; 283 #ifdef MAC 284 int error; 285 286 error = mac_socket_check_poll(active_cred, so); 287 if (error) 288 return (error); 289 #endif 290 return (sopoll(so, events, fp->f_cred, td)); 291 } 292 293 static int 294 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred) 295 { 296 struct socket *so = fp->f_data; 297 int error = 0; 298 299 bzero((caddr_t)ub, sizeof (*ub)); 300 ub->st_mode = S_IFSOCK; 301 #ifdef MAC 302 error = mac_socket_check_stat(active_cred, so); 303 if (error) 304 return (error); 305 #endif 306 SOCK_LOCK(so); 307 if (!SOLISTENING(so)) { 308 struct sockbuf *sb; 309 310 /* 311 * If SBS_CANTRCVMORE is set, but there's still data left 312 * in the receive buffer, the socket is still readable. 313 */ 314 sb = &so->so_rcv; 315 SOCK_RECVBUF_LOCK(so); 316 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb)) 317 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 318 ub->st_size = sbavail(sb) - sb->sb_ctl; 319 SOCK_RECVBUF_UNLOCK(so); 320 321 sb = &so->so_snd; 322 SOCK_SENDBUF_LOCK(so); 323 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 324 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 325 SOCK_SENDBUF_UNLOCK(so); 326 } 327 ub->st_uid = so->so_cred->cr_uid; 328 ub->st_gid = so->so_cred->cr_gid; 329 if (so->so_proto->pr_sense) 330 error = so->so_proto->pr_sense(so, ub); 331 SOCK_UNLOCK(so); 332 return (error); 333 } 334 335 /* 336 * API socket close on file pointer. We call soclose() to close the socket 337 * (including initiating closing protocols). soclose() will sorele() the 338 * file reference but the actual socket will not go away until the socket's 339 * ref count hits 0. 340 */ 341 static int 342 soo_close(struct file *fp, struct thread *td) 343 { 344 int error = 0; 345 struct socket *so; 346 347 so = fp->f_data; 348 fp->f_ops = &badfileops; 349 fp->f_data = NULL; 350 351 if (so) 352 error = soclose(so); 353 return (error); 354 } 355 356 static int 357 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 358 { 359 struct sockaddr_storage ss = { .ss_len = sizeof(ss) }; 360 struct unpcb *unpcb; 361 struct socket *so; 362 int error; 363 364 kif->kf_type = KF_TYPE_SOCKET; 365 so = fp->f_data; 366 CURVNET_SET(so->so_vnet); 367 kif->kf_un.kf_sock.kf_sock_domain0 = 368 so->so_proto->pr_domain->dom_family; 369 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type; 370 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol; 371 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 372 switch (kif->kf_un.kf_sock.kf_sock_domain0) { 373 case AF_INET: 374 case AF_INET6: 375 /* XXX: kf_sock_inpcb is obsolete. It may be removed. */ 376 kif->kf_un.kf_sock.kf_sock_inpcb = (uintptr_t)so->so_pcb; 377 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 378 so->so_rcv.sb_state; 379 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 380 so->so_snd.sb_state; 381 kif->kf_un.kf_sock.kf_sock_sendq = 382 sbused(&so->so_snd); 383 kif->kf_un.kf_sock.kf_sock_recvq = 384 sbused(&so->so_rcv); 385 break; 386 case AF_UNIX: 387 if (so->so_pcb != NULL) { 388 unpcb = (struct unpcb *)(so->so_pcb); 389 if (unpcb->unp_conn) { 390 kif->kf_un.kf_sock.kf_sock_unpconn = 391 (uintptr_t)unpcb->unp_conn; 392 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 393 so->so_rcv.sb_state; 394 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 395 so->so_snd.sb_state; 396 kif->kf_un.kf_sock.kf_sock_sendq = 397 sbused(&so->so_snd); 398 kif->kf_un.kf_sock.kf_sock_recvq = 399 sbused(&so->so_rcv); 400 } 401 } 402 break; 403 } 404 error = sosockaddr(so, (struct sockaddr *)&ss); 405 if (error == 0 && 406 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 407 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_local, ss.ss_len); 408 } 409 ss.ss_len = sizeof(ss); 410 error = sopeeraddr(so, (struct sockaddr *)&ss); 411 if (error == 0 && 412 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 413 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_peer, ss.ss_len); 414 } 415 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 416 sizeof(kif->kf_path)); 417 CURVNET_RESTORE(); 418 return (0); 419 } 420 421 /* 422 * Use the 'backend3' field in AIO jobs to store the amount of data 423 * completed by the AIO job so far. 424 */ 425 #define aio_done backend3 426 427 static STAILQ_HEAD(, task) soaio_jobs; 428 static struct mtx soaio_jobs_lock; 429 static struct task soaio_kproc_task; 430 static int soaio_starting, soaio_idle, soaio_queued; 431 static struct unrhdr *soaio_kproc_unr; 432 433 static int soaio_max_procs = MAX_AIO_PROCS; 434 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 435 "Maximum number of kernel processes to use for async socket IO"); 436 437 static int soaio_num_procs; 438 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 439 "Number of active kernel processes for async socket IO"); 440 441 static int soaio_target_procs = TARGET_AIO_PROCS; 442 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 443 &soaio_target_procs, 0, 444 "Preferred number of ready kernel processes for async socket IO"); 445 446 static int soaio_lifetime; 447 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 448 "Maximum lifetime for idle aiod"); 449 450 static void 451 soaio_kproc_loop(void *arg) 452 { 453 struct proc *p; 454 struct vmspace *myvm; 455 struct task *task; 456 int error, id, pending; 457 458 id = (intptr_t)arg; 459 460 /* 461 * Grab an extra reference on the daemon's vmspace so that it 462 * doesn't get freed by jobs that switch to a different 463 * vmspace. 464 */ 465 p = curproc; 466 myvm = vmspace_acquire_ref(p); 467 468 mtx_lock(&soaio_jobs_lock); 469 MPASS(soaio_starting > 0); 470 soaio_starting--; 471 for (;;) { 472 while (!STAILQ_EMPTY(&soaio_jobs)) { 473 task = STAILQ_FIRST(&soaio_jobs); 474 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 475 soaio_queued--; 476 pending = task->ta_pending; 477 task->ta_pending = 0; 478 mtx_unlock(&soaio_jobs_lock); 479 480 task->ta_func(task->ta_context, pending); 481 482 mtx_lock(&soaio_jobs_lock); 483 } 484 MPASS(soaio_queued == 0); 485 486 if (p->p_vmspace != myvm) { 487 mtx_unlock(&soaio_jobs_lock); 488 vmspace_switch_aio(myvm); 489 mtx_lock(&soaio_jobs_lock); 490 continue; 491 } 492 493 soaio_idle++; 494 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 495 soaio_lifetime); 496 soaio_idle--; 497 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 498 soaio_num_procs > soaio_target_procs) 499 break; 500 } 501 soaio_num_procs--; 502 mtx_unlock(&soaio_jobs_lock); 503 free_unr(soaio_kproc_unr, id); 504 kproc_exit(0); 505 } 506 507 static void 508 soaio_kproc_create(void *context, int pending) 509 { 510 struct proc *p; 511 int error, id; 512 513 mtx_lock(&soaio_jobs_lock); 514 for (;;) { 515 if (soaio_num_procs < soaio_target_procs) { 516 /* Must create */ 517 } else if (soaio_num_procs >= soaio_max_procs) { 518 /* 519 * Hit the limit on kernel processes, don't 520 * create another one. 521 */ 522 break; 523 } else if (soaio_queued <= soaio_idle + soaio_starting) { 524 /* 525 * No more AIO jobs waiting for a process to be 526 * created, so stop. 527 */ 528 break; 529 } 530 soaio_starting++; 531 mtx_unlock(&soaio_jobs_lock); 532 533 id = alloc_unr(soaio_kproc_unr); 534 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 535 &p, 0, 0, "soaiod%d", id); 536 if (error != 0) { 537 free_unr(soaio_kproc_unr, id); 538 mtx_lock(&soaio_jobs_lock); 539 soaio_starting--; 540 break; 541 } 542 543 mtx_lock(&soaio_jobs_lock); 544 soaio_num_procs++; 545 } 546 mtx_unlock(&soaio_jobs_lock); 547 } 548 549 void 550 soaio_enqueue(struct task *task) 551 { 552 553 mtx_lock(&soaio_jobs_lock); 554 MPASS(task->ta_pending == 0); 555 task->ta_pending++; 556 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 557 soaio_queued++; 558 if (soaio_queued <= soaio_idle) 559 wakeup_one(&soaio_idle); 560 else if (soaio_num_procs < soaio_max_procs) 561 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 562 mtx_unlock(&soaio_jobs_lock); 563 } 564 565 static void 566 soaio_init(void) 567 { 568 569 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 570 STAILQ_INIT(&soaio_jobs); 571 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 572 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 573 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 574 } 575 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 576 577 static __inline int 578 soaio_ready(struct socket *so, struct sockbuf *sb) 579 { 580 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 581 } 582 583 static void 584 soaio_process_job(struct socket *so, sb_which which, struct kaiocb *job) 585 { 586 struct ucred *td_savedcred; 587 struct thread *td; 588 struct sockbuf *sb = sobuf(so, which); 589 #ifdef MAC 590 struct file *fp = job->fd_file; 591 #endif 592 size_t cnt, done, job_total_nbytes __diagused; 593 long ru_before; 594 int error, flags; 595 596 SOCK_BUF_UNLOCK(so, which); 597 aio_switch_vmspace(job); 598 td = curthread; 599 retry: 600 td_savedcred = td->td_ucred; 601 td->td_ucred = job->cred; 602 603 job_total_nbytes = job->uiop->uio_resid + job->aio_done; 604 done = job->aio_done; 605 cnt = job->uiop->uio_resid; 606 job->uiop->uio_offset = 0; 607 job->uiop->uio_td = td; 608 flags = MSG_NBIO; 609 610 /* 611 * For resource usage accounting, only count a completed request 612 * as a single message to avoid counting multiple calls to 613 * sosend/soreceive on a blocking socket. 614 */ 615 616 if (sb == &so->so_rcv) { 617 ru_before = td->td_ru.ru_msgrcv; 618 #ifdef MAC 619 error = mac_socket_check_receive(fp->f_cred, so); 620 if (error == 0) 621 622 #endif 623 error = soreceive(so, NULL, job->uiop, NULL, NULL, 624 &flags); 625 if (td->td_ru.ru_msgrcv != ru_before) 626 job->msgrcv = 1; 627 } else { 628 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 629 flags |= MSG_MORETOCOME; 630 ru_before = td->td_ru.ru_msgsnd; 631 #ifdef MAC 632 error = mac_socket_check_send(fp->f_cred, so); 633 if (error == 0) 634 #endif 635 error = sousrsend(so, NULL, job->uiop, NULL, flags, 636 job->userproc); 637 if (td->td_ru.ru_msgsnd != ru_before) 638 job->msgsnd = 1; 639 } 640 641 done += cnt - job->uiop->uio_resid; 642 job->aio_done = done; 643 td->td_ucred = td_savedcred; 644 645 if (error == EWOULDBLOCK) { 646 /* 647 * The request was either partially completed or not 648 * completed at all due to racing with a read() or 649 * write() on the socket. If the socket is 650 * non-blocking, return with any partial completion. 651 * If the socket is blocking or if no progress has 652 * been made, requeue this request at the head of the 653 * queue to try again when the socket is ready. 654 */ 655 MPASS(done != job_total_nbytes); 656 SOCK_BUF_LOCK(so, which); 657 if (done == 0 || !(so->so_state & SS_NBIO)) { 658 empty_results++; 659 if (soaio_ready(so, sb)) { 660 empty_retries++; 661 SOCK_BUF_UNLOCK(so, which); 662 goto retry; 663 } 664 665 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 666 SOCK_BUF_UNLOCK(so, which); 667 if (done != 0) 668 aio_complete(job, done, 0); 669 else 670 aio_cancel(job); 671 SOCK_BUF_LOCK(so, which); 672 } else { 673 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 674 } 675 return; 676 } 677 SOCK_BUF_UNLOCK(so, which); 678 } 679 if (done != 0 && (error == ERESTART || error == EINTR || 680 error == EWOULDBLOCK)) 681 error = 0; 682 if (error) 683 aio_complete(job, -1, error); 684 else 685 aio_complete(job, done, 0); 686 SOCK_BUF_LOCK(so, which); 687 } 688 689 static void 690 soaio_process_sb(struct socket *so, sb_which which) 691 { 692 struct kaiocb *job; 693 struct sockbuf *sb = sobuf(so, which); 694 695 CURVNET_SET(so->so_vnet); 696 SOCK_BUF_LOCK(so, which); 697 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 698 job = TAILQ_FIRST(&sb->sb_aiojobq); 699 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 700 if (!aio_clear_cancel_function(job)) 701 continue; 702 703 soaio_process_job(so, which, job); 704 } 705 706 /* 707 * If there are still pending requests, the socket must not be 708 * ready so set SB_AIO to request a wakeup when the socket 709 * becomes ready. 710 */ 711 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 712 sb->sb_flags |= SB_AIO; 713 sb->sb_flags &= ~SB_AIO_RUNNING; 714 SOCK_BUF_UNLOCK(so, which); 715 716 sorele(so); 717 CURVNET_RESTORE(); 718 } 719 720 void 721 soaio_rcv(void *context, int pending) 722 { 723 struct socket *so; 724 725 so = context; 726 soaio_process_sb(so, SO_RCV); 727 } 728 729 void 730 soaio_snd(void *context, int pending) 731 { 732 struct socket *so; 733 734 so = context; 735 soaio_process_sb(so, SO_SND); 736 } 737 738 void 739 sowakeup_aio(struct socket *so, sb_which which) 740 { 741 struct sockbuf *sb = sobuf(so, which); 742 743 SOCK_BUF_LOCK_ASSERT(so, which); 744 745 sb->sb_flags &= ~SB_AIO; 746 if (sb->sb_flags & SB_AIO_RUNNING) 747 return; 748 sb->sb_flags |= SB_AIO_RUNNING; 749 soref(so); 750 soaio_enqueue(&sb->sb_aiotask); 751 } 752 753 static void 754 soo_aio_cancel(struct kaiocb *job) 755 { 756 struct socket *so; 757 struct sockbuf *sb; 758 long done; 759 int opcode; 760 sb_which which; 761 762 so = job->fd_file->f_data; 763 opcode = job->uaiocb.aio_lio_opcode; 764 if (opcode & LIO_READ) { 765 sb = &so->so_rcv; 766 which = SO_RCV; 767 } else { 768 MPASS(opcode & LIO_WRITE); 769 sb = &so->so_snd; 770 which = SO_SND; 771 } 772 773 SOCK_BUF_LOCK(so, which); 774 if (!aio_cancel_cleared(job)) 775 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 776 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 777 sb->sb_flags &= ~SB_AIO; 778 SOCK_BUF_UNLOCK(so, which); 779 780 done = job->aio_done; 781 if (done != 0) 782 aio_complete(job, done, 0); 783 else 784 aio_cancel(job); 785 } 786 787 static int 788 soo_aio_queue(struct file *fp, struct kaiocb *job) 789 { 790 struct socket *so; 791 struct sockbuf *sb; 792 sb_which which; 793 int error; 794 795 so = fp->f_data; 796 error = so->so_proto->pr_aio_queue(so, job); 797 if (error == 0) 798 return (0); 799 800 /* Lock through the socket, since this may be a listening socket. */ 801 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) { 802 case LIO_READ: 803 SOCK_RECVBUF_LOCK(so); 804 sb = &so->so_rcv; 805 which = SO_RCV; 806 break; 807 case LIO_WRITE: 808 SOCK_SENDBUF_LOCK(so); 809 sb = &so->so_snd; 810 which = SO_SND; 811 break; 812 default: 813 return (EINVAL); 814 } 815 816 if (SOLISTENING(so)) { 817 SOCK_BUF_UNLOCK(so, which); 818 return (EINVAL); 819 } 820 821 if (!aio_set_cancel_function(job, soo_aio_cancel)) 822 panic("new job was cancelled"); 823 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 824 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 825 if (soaio_ready(so, sb)) 826 sowakeup_aio(so, which); 827 else 828 sb->sb_flags |= SB_AIO; 829 } 830 SOCK_BUF_UNLOCK(so, which); 831 return (0); 832 } 833