1 /*- 2 * Copyright (c) 1982, 1986, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/aio.h> 38 #include <sys/domain.h> 39 #include <sys/file.h> 40 #include <sys/filedesc.h> 41 #include <sys/kernel.h> 42 #include <sys/kthread.h> 43 #include <sys/malloc.h> 44 #include <sys/proc.h> 45 #include <sys/protosw.h> 46 #include <sys/sigio.h> 47 #include <sys/signal.h> 48 #include <sys/signalvar.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/filio.h> /* XXX */ 52 #include <sys/sockio.h> 53 #include <sys/stat.h> 54 #include <sys/sysctl.h> 55 #include <sys/sysproto.h> 56 #include <sys/taskqueue.h> 57 #include <sys/uio.h> 58 #include <sys/ucred.h> 59 #include <sys/un.h> 60 #include <sys/unpcb.h> 61 #include <sys/user.h> 62 63 #include <net/if.h> 64 #include <net/if_var.h> 65 #include <net/route.h> 66 #include <net/vnet.h> 67 68 #include <netinet/in.h> 69 #include <netinet/in_pcb.h> 70 71 #include <security/mac/mac_framework.h> 72 73 #include <vm/vm.h> 74 #include <vm/pmap.h> 75 #include <vm/vm_extern.h> 76 #include <vm/vm_map.h> 77 78 static SYSCTL_NODE(_kern_ipc, OID_AUTO, aio, CTLFLAG_RD, NULL, 79 "socket AIO stats"); 80 81 static int empty_results; 82 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_results, CTLFLAG_RD, &empty_results, 83 0, "socket operation returned EAGAIN"); 84 85 static int empty_retries; 86 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_retries, CTLFLAG_RD, &empty_retries, 87 0, "socket operation retries"); 88 89 static fo_rdwr_t soo_read; 90 static fo_rdwr_t soo_write; 91 static fo_ioctl_t soo_ioctl; 92 static fo_poll_t soo_poll; 93 extern fo_kqfilter_t soo_kqfilter; 94 static fo_stat_t soo_stat; 95 static fo_close_t soo_close; 96 static fo_fill_kinfo_t soo_fill_kinfo; 97 static fo_aio_queue_t soo_aio_queue; 98 99 static void soo_aio_cancel(struct kaiocb *job); 100 101 struct fileops socketops = { 102 .fo_read = soo_read, 103 .fo_write = soo_write, 104 .fo_truncate = invfo_truncate, 105 .fo_ioctl = soo_ioctl, 106 .fo_poll = soo_poll, 107 .fo_kqfilter = soo_kqfilter, 108 .fo_stat = soo_stat, 109 .fo_close = soo_close, 110 .fo_chmod = invfo_chmod, 111 .fo_chown = invfo_chown, 112 .fo_sendfile = invfo_sendfile, 113 .fo_fill_kinfo = soo_fill_kinfo, 114 .fo_aio_queue = soo_aio_queue, 115 .fo_flags = DFLAG_PASSABLE 116 }; 117 118 static int 119 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 120 int flags, struct thread *td) 121 { 122 struct socket *so = fp->f_data; 123 int error; 124 125 #ifdef MAC 126 error = mac_socket_check_receive(active_cred, so); 127 if (error) 128 return (error); 129 #endif 130 error = soreceive(so, 0, uio, 0, 0, 0); 131 return (error); 132 } 133 134 static int 135 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 136 int flags, struct thread *td) 137 { 138 struct socket *so = fp->f_data; 139 int error; 140 141 #ifdef MAC 142 error = mac_socket_check_send(active_cred, so); 143 if (error) 144 return (error); 145 #endif 146 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 147 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 148 PROC_LOCK(uio->uio_td->td_proc); 149 tdsignal(uio->uio_td, SIGPIPE); 150 PROC_UNLOCK(uio->uio_td->td_proc); 151 } 152 return (error); 153 } 154 155 static int 156 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 157 struct thread *td) 158 { 159 struct socket *so = fp->f_data; 160 int error = 0; 161 162 switch (cmd) { 163 case FIONBIO: 164 SOCK_LOCK(so); 165 if (*(int *)data) 166 so->so_state |= SS_NBIO; 167 else 168 so->so_state &= ~SS_NBIO; 169 SOCK_UNLOCK(so); 170 break; 171 172 case FIOASYNC: 173 if (*(int *)data) { 174 SOCK_LOCK(so); 175 so->so_state |= SS_ASYNC; 176 if (SOLISTENING(so)) { 177 so->sol_sbrcv_flags |= SB_ASYNC; 178 so->sol_sbsnd_flags |= SB_ASYNC; 179 } else { 180 SOCKBUF_LOCK(&so->so_rcv); 181 so->so_rcv.sb_flags |= SB_ASYNC; 182 SOCKBUF_UNLOCK(&so->so_rcv); 183 SOCKBUF_LOCK(&so->so_snd); 184 so->so_snd.sb_flags |= SB_ASYNC; 185 SOCKBUF_UNLOCK(&so->so_snd); 186 } 187 SOCK_UNLOCK(so); 188 } else { 189 SOCK_LOCK(so); 190 so->so_state &= ~SS_ASYNC; 191 if (SOLISTENING(so)) { 192 so->sol_sbrcv_flags &= ~SB_ASYNC; 193 so->sol_sbsnd_flags &= ~SB_ASYNC; 194 } else { 195 SOCKBUF_LOCK(&so->so_rcv); 196 so->so_rcv.sb_flags &= ~SB_ASYNC; 197 SOCKBUF_UNLOCK(&so->so_rcv); 198 SOCKBUF_LOCK(&so->so_snd); 199 so->so_snd.sb_flags &= ~SB_ASYNC; 200 SOCKBUF_UNLOCK(&so->so_snd); 201 } 202 SOCK_UNLOCK(so); 203 } 204 break; 205 206 case FIONREAD: 207 /* Unlocked read. */ 208 *(int *)data = sbavail(&so->so_rcv); 209 break; 210 211 case FIONWRITE: 212 /* Unlocked read. */ 213 *(int *)data = sbavail(&so->so_snd); 214 break; 215 216 case FIONSPACE: 217 /* Unlocked read. */ 218 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) || 219 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 220 *(int *)data = 0; 221 else 222 *(int *)data = sbspace(&so->so_snd); 223 break; 224 225 case FIOSETOWN: 226 error = fsetown(*(int *)data, &so->so_sigio); 227 break; 228 229 case FIOGETOWN: 230 *(int *)data = fgetown(&so->so_sigio); 231 break; 232 233 case SIOCSPGRP: 234 error = fsetown(-(*(int *)data), &so->so_sigio); 235 break; 236 237 case SIOCGPGRP: 238 *(int *)data = -fgetown(&so->so_sigio); 239 break; 240 241 case SIOCATMARK: 242 /* Unlocked read. */ 243 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 244 break; 245 default: 246 /* 247 * Interface/routing/protocol specific ioctls: interface and 248 * routing ioctls should have a different entry since a 249 * socket is unnecessary. 250 */ 251 if (IOCGROUP(cmd) == 'i') 252 error = ifioctl(so, cmd, data, td); 253 else if (IOCGROUP(cmd) == 'r') { 254 CURVNET_SET(so->so_vnet); 255 error = rtioctl_fib(cmd, data, so->so_fibnum); 256 CURVNET_RESTORE(); 257 } else { 258 CURVNET_SET(so->so_vnet); 259 error = ((*so->so_proto->pr_usrreqs->pru_control) 260 (so, cmd, data, 0, td)); 261 CURVNET_RESTORE(); 262 } 263 break; 264 } 265 return (error); 266 } 267 268 static int 269 soo_poll(struct file *fp, int events, struct ucred *active_cred, 270 struct thread *td) 271 { 272 struct socket *so = fp->f_data; 273 #ifdef MAC 274 int error; 275 276 error = mac_socket_check_poll(active_cred, so); 277 if (error) 278 return (error); 279 #endif 280 return (sopoll(so, events, fp->f_cred, td)); 281 } 282 283 static int 284 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 285 struct thread *td) 286 { 287 struct socket *so = fp->f_data; 288 #ifdef MAC 289 int error; 290 #endif 291 292 bzero((caddr_t)ub, sizeof (*ub)); 293 ub->st_mode = S_IFSOCK; 294 #ifdef MAC 295 error = mac_socket_check_stat(active_cred, so); 296 if (error) 297 return (error); 298 #endif 299 if (!SOLISTENING(so)) { 300 struct sockbuf *sb; 301 302 /* 303 * If SBS_CANTRCVMORE is set, but there's still data left 304 * in the receive buffer, the socket is still readable. 305 */ 306 sb = &so->so_rcv; 307 SOCKBUF_LOCK(sb); 308 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb)) 309 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 310 ub->st_size = sbavail(sb) - sb->sb_ctl; 311 SOCKBUF_UNLOCK(sb); 312 313 sb = &so->so_snd; 314 SOCKBUF_LOCK(sb); 315 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 316 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 317 SOCKBUF_UNLOCK(sb); 318 } 319 ub->st_uid = so->so_cred->cr_uid; 320 ub->st_gid = so->so_cred->cr_gid; 321 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 322 } 323 324 /* 325 * API socket close on file pointer. We call soclose() to close the socket 326 * (including initiating closing protocols). soclose() will sorele() the 327 * file reference but the actual socket will not go away until the socket's 328 * ref count hits 0. 329 */ 330 static int 331 soo_close(struct file *fp, struct thread *td) 332 { 333 int error = 0; 334 struct socket *so; 335 336 so = fp->f_data; 337 fp->f_ops = &badfileops; 338 fp->f_data = NULL; 339 340 if (so) 341 error = soclose(so); 342 return (error); 343 } 344 345 static int 346 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 347 { 348 struct sockaddr *sa; 349 struct inpcb *inpcb; 350 struct unpcb *unpcb; 351 struct socket *so; 352 int error; 353 354 kif->kf_type = KF_TYPE_SOCKET; 355 so = fp->f_data; 356 kif->kf_un.kf_sock.kf_sock_domain0 = 357 so->so_proto->pr_domain->dom_family; 358 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type; 359 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol; 360 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 361 switch (kif->kf_un.kf_sock.kf_sock_domain0) { 362 case AF_INET: 363 case AF_INET6: 364 if (kif->kf_un.kf_sock.kf_sock_protocol0 == IPPROTO_TCP) { 365 if (so->so_pcb != NULL) { 366 inpcb = (struct inpcb *)(so->so_pcb); 367 kif->kf_un.kf_sock.kf_sock_inpcb = 368 (uintptr_t)inpcb->inp_ppcb; 369 kif->kf_un.kf_sock.kf_sock_sendq = 370 sbused(&so->so_snd); 371 kif->kf_un.kf_sock.kf_sock_recvq = 372 sbused(&so->so_rcv); 373 } 374 } 375 break; 376 case AF_UNIX: 377 if (so->so_pcb != NULL) { 378 unpcb = (struct unpcb *)(so->so_pcb); 379 if (unpcb->unp_conn) { 380 kif->kf_un.kf_sock.kf_sock_unpconn = 381 (uintptr_t)unpcb->unp_conn; 382 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 383 so->so_rcv.sb_state; 384 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 385 so->so_snd.sb_state; 386 kif->kf_un.kf_sock.kf_sock_sendq = 387 sbused(&so->so_snd); 388 kif->kf_un.kf_sock.kf_sock_recvq = 389 sbused(&so->so_rcv); 390 } 391 } 392 break; 393 } 394 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 395 if (error == 0 && 396 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 397 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_local, sa->sa_len); 398 free(sa, M_SONAME); 399 } 400 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa); 401 if (error == 0 && 402 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 403 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_peer, sa->sa_len); 404 free(sa, M_SONAME); 405 } 406 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 407 sizeof(kif->kf_path)); 408 return (0); 409 } 410 411 /* 412 * Use the 'backend3' field in AIO jobs to store the amount of data 413 * completed by the AIO job so far. 414 */ 415 #define aio_done backend3 416 417 static STAILQ_HEAD(, task) soaio_jobs; 418 static struct mtx soaio_jobs_lock; 419 static struct task soaio_kproc_task; 420 static int soaio_starting, soaio_idle, soaio_queued; 421 static struct unrhdr *soaio_kproc_unr; 422 423 static int soaio_max_procs = MAX_AIO_PROCS; 424 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 425 "Maximum number of kernel processes to use for async socket IO"); 426 427 static int soaio_num_procs; 428 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 429 "Number of active kernel processes for async socket IO"); 430 431 static int soaio_target_procs = TARGET_AIO_PROCS; 432 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 433 &soaio_target_procs, 0, 434 "Preferred number of ready kernel processes for async socket IO"); 435 436 static int soaio_lifetime; 437 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 438 "Maximum lifetime for idle aiod"); 439 440 static void 441 soaio_kproc_loop(void *arg) 442 { 443 struct proc *p; 444 struct vmspace *myvm; 445 struct task *task; 446 int error, id, pending; 447 448 id = (intptr_t)arg; 449 450 /* 451 * Grab an extra reference on the daemon's vmspace so that it 452 * doesn't get freed by jobs that switch to a different 453 * vmspace. 454 */ 455 p = curproc; 456 myvm = vmspace_acquire_ref(p); 457 458 mtx_lock(&soaio_jobs_lock); 459 MPASS(soaio_starting > 0); 460 soaio_starting--; 461 for (;;) { 462 while (!STAILQ_EMPTY(&soaio_jobs)) { 463 task = STAILQ_FIRST(&soaio_jobs); 464 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 465 soaio_queued--; 466 pending = task->ta_pending; 467 task->ta_pending = 0; 468 mtx_unlock(&soaio_jobs_lock); 469 470 task->ta_func(task->ta_context, pending); 471 472 mtx_lock(&soaio_jobs_lock); 473 } 474 MPASS(soaio_queued == 0); 475 476 if (p->p_vmspace != myvm) { 477 mtx_unlock(&soaio_jobs_lock); 478 vmspace_switch_aio(myvm); 479 mtx_lock(&soaio_jobs_lock); 480 continue; 481 } 482 483 soaio_idle++; 484 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 485 soaio_lifetime); 486 soaio_idle--; 487 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 488 soaio_num_procs > soaio_target_procs) 489 break; 490 } 491 soaio_num_procs--; 492 mtx_unlock(&soaio_jobs_lock); 493 free_unr(soaio_kproc_unr, id); 494 kproc_exit(0); 495 } 496 497 static void 498 soaio_kproc_create(void *context, int pending) 499 { 500 struct proc *p; 501 int error, id; 502 503 mtx_lock(&soaio_jobs_lock); 504 for (;;) { 505 if (soaio_num_procs < soaio_target_procs) { 506 /* Must create */ 507 } else if (soaio_num_procs >= soaio_max_procs) { 508 /* 509 * Hit the limit on kernel processes, don't 510 * create another one. 511 */ 512 break; 513 } else if (soaio_queued <= soaio_idle + soaio_starting) { 514 /* 515 * No more AIO jobs waiting for a process to be 516 * created, so stop. 517 */ 518 break; 519 } 520 soaio_starting++; 521 mtx_unlock(&soaio_jobs_lock); 522 523 id = alloc_unr(soaio_kproc_unr); 524 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 525 &p, 0, 0, "soaiod%d", id); 526 if (error != 0) { 527 free_unr(soaio_kproc_unr, id); 528 mtx_lock(&soaio_jobs_lock); 529 soaio_starting--; 530 break; 531 } 532 533 mtx_lock(&soaio_jobs_lock); 534 soaio_num_procs++; 535 } 536 mtx_unlock(&soaio_jobs_lock); 537 } 538 539 void 540 soaio_enqueue(struct task *task) 541 { 542 543 mtx_lock(&soaio_jobs_lock); 544 MPASS(task->ta_pending == 0); 545 task->ta_pending++; 546 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 547 soaio_queued++; 548 if (soaio_queued <= soaio_idle) 549 wakeup_one(&soaio_idle); 550 else if (soaio_num_procs < soaio_max_procs) 551 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 552 mtx_unlock(&soaio_jobs_lock); 553 } 554 555 static void 556 soaio_init(void) 557 { 558 559 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 560 STAILQ_INIT(&soaio_jobs); 561 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 562 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 563 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 564 if (soaio_target_procs > 0) 565 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 566 } 567 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 568 569 static __inline int 570 soaio_ready(struct socket *so, struct sockbuf *sb) 571 { 572 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 573 } 574 575 static void 576 soaio_process_job(struct socket *so, struct sockbuf *sb, struct kaiocb *job) 577 { 578 struct ucred *td_savedcred; 579 struct thread *td; 580 struct file *fp; 581 struct uio uio; 582 struct iovec iov; 583 size_t cnt, done; 584 long ru_before; 585 int error, flags; 586 587 SOCKBUF_UNLOCK(sb); 588 aio_switch_vmspace(job); 589 td = curthread; 590 fp = job->fd_file; 591 retry: 592 td_savedcred = td->td_ucred; 593 td->td_ucred = job->cred; 594 595 done = job->aio_done; 596 cnt = job->uaiocb.aio_nbytes - done; 597 iov.iov_base = (void *)((uintptr_t)job->uaiocb.aio_buf + done); 598 iov.iov_len = cnt; 599 uio.uio_iov = &iov; 600 uio.uio_iovcnt = 1; 601 uio.uio_offset = 0; 602 uio.uio_resid = cnt; 603 uio.uio_segflg = UIO_USERSPACE; 604 uio.uio_td = td; 605 flags = MSG_NBIO; 606 607 /* 608 * For resource usage accounting, only count a completed request 609 * as a single message to avoid counting multiple calls to 610 * sosend/soreceive on a blocking socket. 611 */ 612 613 if (sb == &so->so_rcv) { 614 uio.uio_rw = UIO_READ; 615 ru_before = td->td_ru.ru_msgrcv; 616 #ifdef MAC 617 error = mac_socket_check_receive(fp->f_cred, so); 618 if (error == 0) 619 620 #endif 621 error = soreceive(so, NULL, &uio, NULL, NULL, &flags); 622 if (td->td_ru.ru_msgrcv != ru_before) 623 job->msgrcv = 1; 624 } else { 625 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 626 flags |= MSG_MORETOCOME; 627 uio.uio_rw = UIO_WRITE; 628 ru_before = td->td_ru.ru_msgsnd; 629 #ifdef MAC 630 error = mac_socket_check_send(fp->f_cred, so); 631 if (error == 0) 632 #endif 633 error = sosend(so, NULL, &uio, NULL, NULL, flags, td); 634 if (td->td_ru.ru_msgsnd != ru_before) 635 job->msgsnd = 1; 636 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 637 PROC_LOCK(job->userproc); 638 kern_psignal(job->userproc, SIGPIPE); 639 PROC_UNLOCK(job->userproc); 640 } 641 } 642 643 done += cnt - uio.uio_resid; 644 job->aio_done = done; 645 td->td_ucred = td_savedcred; 646 647 if (error == EWOULDBLOCK) { 648 /* 649 * The request was either partially completed or not 650 * completed at all due to racing with a read() or 651 * write() on the socket. If the socket is 652 * non-blocking, return with any partial completion. 653 * If the socket is blocking or if no progress has 654 * been made, requeue this request at the head of the 655 * queue to try again when the socket is ready. 656 */ 657 MPASS(done != job->uaiocb.aio_nbytes); 658 SOCKBUF_LOCK(sb); 659 if (done == 0 || !(so->so_state & SS_NBIO)) { 660 empty_results++; 661 if (soaio_ready(so, sb)) { 662 empty_retries++; 663 SOCKBUF_UNLOCK(sb); 664 goto retry; 665 } 666 667 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 668 SOCKBUF_UNLOCK(sb); 669 if (done != 0) 670 aio_complete(job, done, 0); 671 else 672 aio_cancel(job); 673 SOCKBUF_LOCK(sb); 674 } else { 675 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 676 } 677 return; 678 } 679 SOCKBUF_UNLOCK(sb); 680 } 681 if (done != 0 && (error == ERESTART || error == EINTR || 682 error == EWOULDBLOCK)) 683 error = 0; 684 if (error) 685 aio_complete(job, -1, error); 686 else 687 aio_complete(job, done, 0); 688 SOCKBUF_LOCK(sb); 689 } 690 691 static void 692 soaio_process_sb(struct socket *so, struct sockbuf *sb) 693 { 694 struct kaiocb *job; 695 696 SOCKBUF_LOCK(sb); 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, sb, 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 SOCKBUF_UNLOCK(sb); 715 716 SOCK_LOCK(so); 717 sorele(so); 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->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->so_snd); 736 } 737 738 void 739 sowakeup_aio(struct socket *so, struct sockbuf *sb) 740 { 741 742 SOCKBUF_LOCK_ASSERT(sb); 743 sb->sb_flags &= ~SB_AIO; 744 if (sb->sb_flags & SB_AIO_RUNNING) 745 return; 746 sb->sb_flags |= SB_AIO_RUNNING; 747 if (sb == &so->so_snd) 748 SOCK_LOCK(so); 749 soref(so); 750 if (sb == &so->so_snd) 751 SOCK_UNLOCK(so); 752 soaio_enqueue(&sb->sb_aiotask); 753 } 754 755 static void 756 soo_aio_cancel(struct kaiocb *job) 757 { 758 struct socket *so; 759 struct sockbuf *sb; 760 long done; 761 int opcode; 762 763 so = job->fd_file->f_data; 764 opcode = job->uaiocb.aio_lio_opcode; 765 if (opcode == LIO_READ) 766 sb = &so->so_rcv; 767 else { 768 MPASS(opcode == LIO_WRITE); 769 sb = &so->so_snd; 770 } 771 772 SOCKBUF_LOCK(sb); 773 if (!aio_cancel_cleared(job)) 774 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 775 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 776 sb->sb_flags &= ~SB_AIO; 777 SOCKBUF_UNLOCK(sb); 778 779 done = job->aio_done; 780 if (done != 0) 781 aio_complete(job, done, 0); 782 else 783 aio_cancel(job); 784 } 785 786 static int 787 soo_aio_queue(struct file *fp, struct kaiocb *job) 788 { 789 struct socket *so; 790 struct sockbuf *sb; 791 int error; 792 793 so = fp->f_data; 794 error = (*so->so_proto->pr_usrreqs->pru_aio_queue)(so, job); 795 if (error == 0) 796 return (0); 797 798 switch (job->uaiocb.aio_lio_opcode) { 799 case LIO_READ: 800 sb = &so->so_rcv; 801 break; 802 case LIO_WRITE: 803 sb = &so->so_snd; 804 break; 805 default: 806 return (EINVAL); 807 } 808 809 SOCKBUF_LOCK(sb); 810 if (!aio_set_cancel_function(job, soo_aio_cancel)) 811 panic("new job was cancelled"); 812 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 813 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 814 if (soaio_ready(so, sb)) 815 sowakeup_aio(so, sb); 816 else 817 sb->sb_flags |= SB_AIO; 818 } 819 SOCKBUF_UNLOCK(sb); 820 return (0); 821 } 822