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_chmod_t soo_chmod; 94 static fo_fill_kinfo_t soo_fill_kinfo; 95 static fo_aio_queue_t soo_aio_queue; 96 97 static void soo_aio_cancel(struct kaiocb *job); 98 99 const struct fileops socketops = { 100 .fo_read = soo_read, 101 .fo_write = soo_write, 102 .fo_truncate = invfo_truncate, 103 .fo_ioctl = soo_ioctl, 104 .fo_poll = soo_poll, 105 .fo_kqfilter = soo_kqfilter, 106 .fo_stat = soo_stat, 107 .fo_close = soo_close, 108 .fo_chmod = soo_chmod, 109 .fo_chown = invfo_chown, 110 .fo_sendfile = invfo_sendfile, 111 .fo_fill_kinfo = soo_fill_kinfo, 112 .fo_aio_queue = soo_aio_queue, 113 .fo_cmp = file_kcmp_generic, 114 .fo_flags = DFLAG_PASSABLE 115 }; 116 117 static int 118 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 119 int flags, struct thread *td) 120 { 121 struct socket *so = fp->f_data; 122 int error; 123 124 #ifdef MAC 125 error = mac_socket_check_receive(active_cred, so); 126 if (error) 127 return (error); 128 #endif 129 error = soreceive(so, 0, uio, 0, 0, 0); 130 return (error); 131 } 132 133 static int 134 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 135 int flags, struct thread *td) 136 { 137 struct socket *so = fp->f_data; 138 int error; 139 140 #ifdef MAC 141 error = mac_socket_check_send(active_cred, so); 142 if (error) 143 return (error); 144 #endif 145 error = sousrsend(so, NULL, uio, NULL, 0, NULL); 146 return (error); 147 } 148 149 static int 150 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 151 struct thread *td) 152 { 153 struct socket *so = fp->f_data; 154 int error = 0; 155 156 switch (cmd) { 157 case FIONBIO: 158 SOCK_LOCK(so); 159 if (*(int *)data) 160 so->so_state |= SS_NBIO; 161 else 162 so->so_state &= ~SS_NBIO; 163 SOCK_UNLOCK(so); 164 break; 165 166 case FIOASYNC: 167 if (*(int *)data) { 168 SOCK_LOCK(so); 169 so->so_state |= SS_ASYNC; 170 if (SOLISTENING(so)) { 171 so->sol_sbrcv_flags |= SB_ASYNC; 172 so->sol_sbsnd_flags |= SB_ASYNC; 173 } else { 174 SOCK_RECVBUF_LOCK(so); 175 so->so_rcv.sb_flags |= SB_ASYNC; 176 SOCK_RECVBUF_UNLOCK(so); 177 SOCK_SENDBUF_LOCK(so); 178 so->so_snd.sb_flags |= SB_ASYNC; 179 SOCK_SENDBUF_UNLOCK(so); 180 } 181 SOCK_UNLOCK(so); 182 } else { 183 SOCK_LOCK(so); 184 so->so_state &= ~SS_ASYNC; 185 if (SOLISTENING(so)) { 186 so->sol_sbrcv_flags &= ~SB_ASYNC; 187 so->sol_sbsnd_flags &= ~SB_ASYNC; 188 } else { 189 SOCK_RECVBUF_LOCK(so); 190 so->so_rcv.sb_flags &= ~SB_ASYNC; 191 SOCK_RECVBUF_UNLOCK(so); 192 SOCK_SENDBUF_LOCK(so); 193 so->so_snd.sb_flags &= ~SB_ASYNC; 194 SOCK_SENDBUF_UNLOCK(so); 195 } 196 SOCK_UNLOCK(so); 197 } 198 break; 199 200 case FIONREAD: 201 SOCK_RECVBUF_LOCK(so); 202 if (SOLISTENING(so)) { 203 error = EINVAL; 204 } else { 205 *(int *)data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl; 206 } 207 SOCK_RECVBUF_UNLOCK(so); 208 break; 209 210 case FIONWRITE: 211 /* Unlocked read. */ 212 if (SOLISTENING(so)) { 213 error = EINVAL; 214 } else { 215 *(int *)data = sbavail(&so->so_snd); 216 } 217 break; 218 219 case FIONSPACE: 220 /* Unlocked read. */ 221 if (SOLISTENING(so)) { 222 error = EINVAL; 223 } else { 224 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) || 225 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) { 226 *(int *)data = 0; 227 } else { 228 *(int *)data = sbspace(&so->so_snd); 229 } 230 } 231 break; 232 233 case FIOSETOWN: 234 error = fsetown(*(int *)data, &so->so_sigio); 235 break; 236 237 case FIOGETOWN: 238 *(int *)data = fgetown(&so->so_sigio); 239 break; 240 241 case SIOCSPGRP: 242 error = fsetown(-(*(int *)data), &so->so_sigio); 243 break; 244 245 case SIOCGPGRP: 246 *(int *)data = -fgetown(&so->so_sigio); 247 break; 248 249 case SIOCATMARK: 250 /* Unlocked read. */ 251 if (SOLISTENING(so)) { 252 error = EINVAL; 253 } else { 254 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 255 } 256 break; 257 default: 258 /* 259 * Interface/routing/protocol specific ioctls: interface and 260 * routing ioctls should have a different entry since a 261 * socket is unnecessary. 262 */ 263 if (IOCGROUP(cmd) == 'i') 264 error = ifioctl(so, cmd, data, td); 265 else if (IOCGROUP(cmd) == 'r') { 266 CURVNET_SET(so->so_vnet); 267 error = rtioctl_fib(cmd, data, so->so_fibnum); 268 CURVNET_RESTORE(); 269 } else { 270 CURVNET_SET(so->so_vnet); 271 error = so->so_proto->pr_control(so, cmd, data, 0, td); 272 CURVNET_RESTORE(); 273 } 274 break; 275 } 276 return (error); 277 } 278 279 static int 280 soo_poll(struct file *fp, int events, struct ucred *active_cred, 281 struct thread *td) 282 { 283 struct socket *so = fp->f_data; 284 #ifdef MAC 285 int error; 286 287 error = mac_socket_check_poll(active_cred, so); 288 if (error) 289 return (error); 290 #endif 291 return (sopoll(so, events, fp->f_cred, td)); 292 } 293 294 static int 295 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred) 296 { 297 struct socket *so = fp->f_data; 298 int error = 0; 299 300 bzero((caddr_t)ub, sizeof (*ub)); 301 ub->st_mode = S_IFSOCK; 302 #ifdef MAC 303 error = mac_socket_check_stat(active_cred, so); 304 if (error) 305 return (error); 306 #endif 307 SOCK_LOCK(so); 308 if (!SOLISTENING(so)) { 309 struct sockbuf *sb; 310 311 /* 312 * If SBS_CANTRCVMORE is set, but there's still data left 313 * in the receive buffer, the socket is still readable. 314 */ 315 sb = &so->so_rcv; 316 SOCK_RECVBUF_LOCK(so); 317 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb)) 318 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 319 ub->st_size = sbavail(sb) - sb->sb_ctl; 320 SOCK_RECVBUF_UNLOCK(so); 321 322 sb = &so->so_snd; 323 SOCK_SENDBUF_LOCK(so); 324 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 325 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 326 SOCK_SENDBUF_UNLOCK(so); 327 } 328 ub->st_uid = so->so_cred->cr_uid; 329 ub->st_gid = so->so_cred->cr_gid; 330 if (so->so_proto->pr_sense) 331 error = so->so_proto->pr_sense(so, ub); 332 SOCK_UNLOCK(so); 333 return (error); 334 } 335 336 /* 337 * API socket close on file pointer. We call soclose() to close the socket 338 * (including initiating closing protocols). soclose() will sorele() the 339 * file reference but the actual socket will not go away until the socket's 340 * ref count hits 0. 341 */ 342 static int 343 soo_close(struct file *fp, struct thread *td) 344 { 345 int error = 0; 346 struct socket *so; 347 348 so = fp->f_data; 349 fp->f_ops = &badfileops; 350 fp->f_data = NULL; 351 352 if (so) 353 error = soclose(so); 354 return (error); 355 } 356 357 static int 358 soo_chmod(struct file *fp, mode_t mode, struct ucred *cred, struct thread *td) 359 { 360 struct socket *so; 361 int error; 362 363 so = fp->f_data; 364 if (so->so_proto->pr_chmod != NULL) 365 error = so->so_proto->pr_chmod(so, mode, cred, td); 366 else 367 error = EINVAL; 368 return (error); 369 } 370 371 static int 372 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 373 { 374 struct sockaddr_storage ss = { .ss_len = sizeof(ss) }; 375 struct unpcb *unpcb; 376 struct socket *so; 377 int error; 378 379 kif->kf_type = KF_TYPE_SOCKET; 380 so = fp->f_data; 381 CURVNET_SET(so->so_vnet); 382 kif->kf_un.kf_sock.kf_sock_domain0 = 383 so->so_proto->pr_domain->dom_family; 384 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type; 385 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol; 386 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 387 switch (kif->kf_un.kf_sock.kf_sock_domain0) { 388 case AF_INET: 389 case AF_INET6: 390 /* XXX: kf_sock_inpcb is obsolete. It may be removed. */ 391 kif->kf_un.kf_sock.kf_sock_inpcb = (uintptr_t)so->so_pcb; 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 break; 401 case AF_UNIX: 402 if (so->so_pcb != NULL) { 403 unpcb = (struct unpcb *)(so->so_pcb); 404 if (unpcb->unp_conn) { 405 kif->kf_un.kf_sock.kf_sock_unpconn = 406 (uintptr_t)unpcb->unp_conn; 407 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 408 so->so_rcv.sb_state; 409 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 410 so->so_snd.sb_state; 411 kif->kf_un.kf_sock.kf_sock_sendq = 412 sbused(&so->so_snd); 413 kif->kf_un.kf_sock.kf_sock_recvq = 414 sbused(&so->so_rcv); 415 } 416 } 417 break; 418 } 419 error = sosockaddr(so, (struct sockaddr *)&ss); 420 if (error == 0 && 421 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 422 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_local, ss.ss_len); 423 } 424 ss.ss_len = sizeof(ss); 425 error = sopeeraddr(so, (struct sockaddr *)&ss); 426 if (error == 0 && 427 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 428 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_peer, ss.ss_len); 429 } 430 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 431 sizeof(kif->kf_path)); 432 CURVNET_RESTORE(); 433 return (0); 434 } 435 436 /* 437 * Use the 'backend3' field in AIO jobs to store the amount of data 438 * completed by the AIO job so far. 439 */ 440 #define aio_done backend3 441 442 static STAILQ_HEAD(, task) soaio_jobs; 443 static struct mtx soaio_jobs_lock; 444 static struct task soaio_kproc_task; 445 static int soaio_starting, soaio_idle, soaio_queued; 446 static struct unrhdr *soaio_kproc_unr; 447 448 static int soaio_max_procs = MAX_AIO_PROCS; 449 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 450 "Maximum number of kernel processes to use for async socket IO"); 451 452 static int soaio_num_procs; 453 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 454 "Number of active kernel processes for async socket IO"); 455 456 static int soaio_target_procs = TARGET_AIO_PROCS; 457 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 458 &soaio_target_procs, 0, 459 "Preferred number of ready kernel processes for async socket IO"); 460 461 static int soaio_lifetime; 462 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 463 "Maximum lifetime for idle aiod"); 464 465 static void 466 soaio_kproc_loop(void *arg) 467 { 468 struct proc *p; 469 struct vmspace *myvm; 470 struct task *task; 471 int error, id, pending; 472 473 id = (intptr_t)arg; 474 475 /* 476 * Grab an extra reference on the daemon's vmspace so that it 477 * doesn't get freed by jobs that switch to a different 478 * vmspace. 479 */ 480 p = curproc; 481 myvm = vmspace_acquire_ref(p); 482 483 mtx_lock(&soaio_jobs_lock); 484 MPASS(soaio_starting > 0); 485 soaio_starting--; 486 for (;;) { 487 while (!STAILQ_EMPTY(&soaio_jobs)) { 488 task = STAILQ_FIRST(&soaio_jobs); 489 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 490 soaio_queued--; 491 pending = task->ta_pending; 492 task->ta_pending = 0; 493 mtx_unlock(&soaio_jobs_lock); 494 495 task->ta_func(task->ta_context, pending); 496 497 mtx_lock(&soaio_jobs_lock); 498 } 499 MPASS(soaio_queued == 0); 500 501 if (p->p_vmspace != myvm) { 502 mtx_unlock(&soaio_jobs_lock); 503 vmspace_switch_aio(myvm); 504 mtx_lock(&soaio_jobs_lock); 505 continue; 506 } 507 508 soaio_idle++; 509 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 510 soaio_lifetime); 511 soaio_idle--; 512 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 513 soaio_num_procs > soaio_target_procs) 514 break; 515 } 516 soaio_num_procs--; 517 mtx_unlock(&soaio_jobs_lock); 518 free_unr(soaio_kproc_unr, id); 519 kproc_exit(0); 520 } 521 522 static void 523 soaio_kproc_create(void *context, int pending) 524 { 525 struct proc *p; 526 int error, id; 527 528 mtx_lock(&soaio_jobs_lock); 529 for (;;) { 530 if (soaio_num_procs < soaio_target_procs) { 531 /* Must create */ 532 } else if (soaio_num_procs >= soaio_max_procs) { 533 /* 534 * Hit the limit on kernel processes, don't 535 * create another one. 536 */ 537 break; 538 } else if (soaio_queued <= soaio_idle + soaio_starting) { 539 /* 540 * No more AIO jobs waiting for a process to be 541 * created, so stop. 542 */ 543 break; 544 } 545 soaio_starting++; 546 mtx_unlock(&soaio_jobs_lock); 547 548 id = alloc_unr(soaio_kproc_unr); 549 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 550 &p, 0, 0, "soaiod%d", id); 551 if (error != 0) { 552 free_unr(soaio_kproc_unr, id); 553 mtx_lock(&soaio_jobs_lock); 554 soaio_starting--; 555 break; 556 } 557 558 mtx_lock(&soaio_jobs_lock); 559 soaio_num_procs++; 560 } 561 mtx_unlock(&soaio_jobs_lock); 562 } 563 564 void 565 soaio_enqueue(struct task *task) 566 { 567 568 mtx_lock(&soaio_jobs_lock); 569 MPASS(task->ta_pending == 0); 570 task->ta_pending++; 571 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 572 soaio_queued++; 573 if (soaio_queued <= soaio_idle) 574 wakeup_one(&soaio_idle); 575 else if (soaio_num_procs < soaio_max_procs) 576 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 577 mtx_unlock(&soaio_jobs_lock); 578 } 579 580 static void 581 soaio_init(void) 582 { 583 584 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 585 STAILQ_INIT(&soaio_jobs); 586 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 587 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 588 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 589 } 590 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 591 592 static __inline int 593 soaio_ready(struct socket *so, struct sockbuf *sb) 594 { 595 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 596 } 597 598 static void 599 soaio_process_job(struct socket *so, sb_which which, struct kaiocb *job) 600 { 601 struct ucred *td_savedcred; 602 struct thread *td; 603 struct sockbuf *sb = sobuf(so, which); 604 #ifdef MAC 605 struct file *fp = job->fd_file; 606 #endif 607 size_t cnt, done, job_total_nbytes __diagused; 608 long ru_before; 609 int error, flags; 610 611 SOCK_BUF_UNLOCK(so, which); 612 aio_switch_vmspace(job); 613 td = curthread; 614 retry: 615 td_savedcred = td->td_ucred; 616 td->td_ucred = job->cred; 617 618 job_total_nbytes = job->uiop->uio_resid + job->aio_done; 619 done = job->aio_done; 620 cnt = job->uiop->uio_resid; 621 job->uiop->uio_offset = 0; 622 job->uiop->uio_td = td; 623 flags = MSG_NBIO; 624 625 /* 626 * For resource usage accounting, only count a completed request 627 * as a single message to avoid counting multiple calls to 628 * sosend/soreceive on a blocking socket. 629 */ 630 631 if (sb == &so->so_rcv) { 632 ru_before = td->td_ru.ru_msgrcv; 633 #ifdef MAC 634 error = mac_socket_check_receive(fp->f_cred, so); 635 if (error == 0) 636 637 #endif 638 error = soreceive(so, NULL, job->uiop, NULL, NULL, 639 &flags); 640 if (td->td_ru.ru_msgrcv != ru_before) 641 job->msgrcv = 1; 642 } else { 643 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 644 flags |= MSG_MORETOCOME; 645 ru_before = td->td_ru.ru_msgsnd; 646 #ifdef MAC 647 error = mac_socket_check_send(fp->f_cred, so); 648 if (error == 0) 649 #endif 650 error = sousrsend(so, NULL, job->uiop, NULL, flags, 651 job->userproc); 652 if (td->td_ru.ru_msgsnd != ru_before) 653 job->msgsnd = 1; 654 } 655 656 done += cnt - job->uiop->uio_resid; 657 job->aio_done = done; 658 td->td_ucred = td_savedcred; 659 660 if (error == EWOULDBLOCK) { 661 /* 662 * The request was either partially completed or not 663 * completed at all due to racing with a read() or 664 * write() on the socket. If the socket is 665 * non-blocking, return with any partial completion. 666 * If the socket is blocking or if no progress has 667 * been made, requeue this request at the head of the 668 * queue to try again when the socket is ready. 669 */ 670 MPASS(done != job_total_nbytes); 671 SOCK_BUF_LOCK(so, which); 672 if (done == 0 || !(so->so_state & SS_NBIO)) { 673 empty_results++; 674 if (soaio_ready(so, sb)) { 675 empty_retries++; 676 SOCK_BUF_UNLOCK(so, which); 677 goto retry; 678 } 679 680 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 681 SOCK_BUF_UNLOCK(so, which); 682 if (done != 0) 683 aio_complete(job, done, 0); 684 else 685 aio_cancel(job); 686 SOCK_BUF_LOCK(so, which); 687 } else { 688 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 689 } 690 return; 691 } 692 SOCK_BUF_UNLOCK(so, which); 693 } 694 if (done != 0 && (error == ERESTART || error == EINTR || 695 error == EWOULDBLOCK)) 696 error = 0; 697 if (error) 698 aio_complete(job, -1, error); 699 else 700 aio_complete(job, done, 0); 701 SOCK_BUF_LOCK(so, which); 702 } 703 704 static void 705 soaio_process_sb(struct socket *so, sb_which which) 706 { 707 struct kaiocb *job; 708 struct sockbuf *sb = sobuf(so, which); 709 710 CURVNET_SET(so->so_vnet); 711 SOCK_BUF_LOCK(so, which); 712 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 713 job = TAILQ_FIRST(&sb->sb_aiojobq); 714 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 715 if (!aio_clear_cancel_function(job)) 716 continue; 717 718 soaio_process_job(so, which, job); 719 } 720 721 /* 722 * If there are still pending requests, the socket must not be 723 * ready so set SB_AIO to request a wakeup when the socket 724 * becomes ready. 725 */ 726 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 727 sb->sb_flags |= SB_AIO; 728 sb->sb_flags &= ~SB_AIO_RUNNING; 729 SOCK_BUF_UNLOCK(so, which); 730 731 sorele(so); 732 CURVNET_RESTORE(); 733 } 734 735 void 736 soaio_rcv(void *context, int pending) 737 { 738 struct socket *so; 739 740 so = context; 741 soaio_process_sb(so, SO_RCV); 742 } 743 744 void 745 soaio_snd(void *context, int pending) 746 { 747 struct socket *so; 748 749 so = context; 750 soaio_process_sb(so, SO_SND); 751 } 752 753 void 754 sowakeup_aio(struct socket *so, sb_which which) 755 { 756 struct sockbuf *sb = sobuf(so, which); 757 758 SOCK_BUF_LOCK_ASSERT(so, which); 759 760 sb->sb_flags &= ~SB_AIO; 761 if (sb->sb_flags & SB_AIO_RUNNING) 762 return; 763 sb->sb_flags |= SB_AIO_RUNNING; 764 soref(so); 765 soaio_enqueue(&sb->sb_aiotask); 766 } 767 768 static void 769 soo_aio_cancel(struct kaiocb *job) 770 { 771 struct socket *so; 772 struct sockbuf *sb; 773 long done; 774 int opcode; 775 sb_which which; 776 777 so = job->fd_file->f_data; 778 opcode = job->uaiocb.aio_lio_opcode; 779 if (opcode & LIO_READ) { 780 sb = &so->so_rcv; 781 which = SO_RCV; 782 } else { 783 MPASS(opcode & LIO_WRITE); 784 sb = &so->so_snd; 785 which = SO_SND; 786 } 787 788 SOCK_BUF_LOCK(so, which); 789 if (!aio_cancel_cleared(job)) 790 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 791 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 792 sb->sb_flags &= ~SB_AIO; 793 SOCK_BUF_UNLOCK(so, which); 794 795 done = job->aio_done; 796 if (done != 0) 797 aio_complete(job, done, 0); 798 else 799 aio_cancel(job); 800 } 801 802 static int 803 soo_aio_queue(struct file *fp, struct kaiocb *job) 804 { 805 struct socket *so; 806 struct sockbuf *sb; 807 sb_which which; 808 int error; 809 810 so = fp->f_data; 811 error = so->so_proto->pr_aio_queue(so, job); 812 if (error == 0) 813 return (0); 814 815 /* Lock through the socket, since this may be a listening socket. */ 816 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) { 817 case LIO_READ: 818 SOCK_RECVBUF_LOCK(so); 819 sb = &so->so_rcv; 820 which = SO_RCV; 821 break; 822 case LIO_WRITE: 823 SOCK_SENDBUF_LOCK(so); 824 sb = &so->so_snd; 825 which = SO_SND; 826 break; 827 default: 828 return (EINVAL); 829 } 830 831 if (SOLISTENING(so)) { 832 SOCK_BUF_UNLOCK(so, which); 833 return (EINVAL); 834 } 835 836 if (!aio_set_cancel_function(job, soo_aio_cancel)) 837 panic("new job was cancelled"); 838 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 839 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 840 if (soaio_ready(so, sb)) 841 sowakeup_aio(so, which); 842 else 843 sb->sb_flags |= SB_AIO; 844 } 845 SOCK_BUF_UNLOCK(so, which); 846 return (0); 847 } 848