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 struct sockbuf *sb; 289 #ifdef MAC 290 int error; 291 #endif 292 293 bzero((caddr_t)ub, sizeof (*ub)); 294 ub->st_mode = S_IFSOCK; 295 #ifdef MAC 296 error = mac_socket_check_stat(active_cred, so); 297 if (error) 298 return (error); 299 #endif 300 /* 301 * If SBS_CANTRCVMORE is set, but there's still data left in the 302 * receive buffer, the socket is still readable. 303 */ 304 sb = &so->so_rcv; 305 SOCKBUF_LOCK(sb); 306 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb)) 307 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 308 ub->st_size = sbavail(sb) - sb->sb_ctl; 309 SOCKBUF_UNLOCK(sb); 310 311 sb = &so->so_snd; 312 SOCKBUF_LOCK(sb); 313 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 314 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 315 SOCKBUF_UNLOCK(sb); 316 ub->st_uid = so->so_cred->cr_uid; 317 ub->st_gid = so->so_cred->cr_gid; 318 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 319 } 320 321 /* 322 * API socket close on file pointer. We call soclose() to close the socket 323 * (including initiating closing protocols). soclose() will sorele() the 324 * file reference but the actual socket will not go away until the socket's 325 * ref count hits 0. 326 */ 327 static int 328 soo_close(struct file *fp, struct thread *td) 329 { 330 int error = 0; 331 struct socket *so; 332 333 so = fp->f_data; 334 fp->f_ops = &badfileops; 335 fp->f_data = NULL; 336 337 if (so) 338 error = soclose(so); 339 return (error); 340 } 341 342 static int 343 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 344 { 345 struct sockaddr *sa; 346 struct inpcb *inpcb; 347 struct unpcb *unpcb; 348 struct socket *so; 349 int error; 350 351 kif->kf_type = KF_TYPE_SOCKET; 352 so = fp->f_data; 353 kif->kf_un.kf_sock.kf_sock_domain0 = 354 so->so_proto->pr_domain->dom_family; 355 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type; 356 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol; 357 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 358 switch (kif->kf_un.kf_sock.kf_sock_domain0) { 359 case AF_INET: 360 case AF_INET6: 361 if (kif->kf_un.kf_sock.kf_sock_protocol0 == IPPROTO_TCP) { 362 if (so->so_pcb != NULL) { 363 inpcb = (struct inpcb *)(so->so_pcb); 364 kif->kf_un.kf_sock.kf_sock_inpcb = 365 (uintptr_t)inpcb->inp_ppcb; 366 kif->kf_un.kf_sock.kf_sock_sendq = 367 sbused(&so->so_snd); 368 kif->kf_un.kf_sock.kf_sock_recvq = 369 sbused(&so->so_rcv); 370 } 371 } 372 break; 373 case AF_UNIX: 374 if (so->so_pcb != NULL) { 375 unpcb = (struct unpcb *)(so->so_pcb); 376 if (unpcb->unp_conn) { 377 kif->kf_un.kf_sock.kf_sock_unpconn = 378 (uintptr_t)unpcb->unp_conn; 379 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 380 so->so_rcv.sb_state; 381 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 382 so->so_snd.sb_state; 383 kif->kf_un.kf_sock.kf_sock_sendq = 384 sbused(&so->so_snd); 385 kif->kf_un.kf_sock.kf_sock_recvq = 386 sbused(&so->so_rcv); 387 } 388 } 389 break; 390 } 391 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 392 if (error == 0 && 393 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 394 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_local, sa->sa_len); 395 free(sa, M_SONAME); 396 } 397 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa); 398 if (error == 0 && 399 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 400 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_peer, sa->sa_len); 401 free(sa, M_SONAME); 402 } 403 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 404 sizeof(kif->kf_path)); 405 return (0); 406 } 407 408 /* 409 * Use the 'backend3' field in AIO jobs to store the amount of data 410 * completed by the AIO job so far. 411 */ 412 #define aio_done backend3 413 414 static STAILQ_HEAD(, task) soaio_jobs; 415 static struct mtx soaio_jobs_lock; 416 static struct task soaio_kproc_task; 417 static int soaio_starting, soaio_idle, soaio_queued; 418 static struct unrhdr *soaio_kproc_unr; 419 420 static int soaio_max_procs = MAX_AIO_PROCS; 421 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 422 "Maximum number of kernel processes to use for async socket IO"); 423 424 static int soaio_num_procs; 425 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 426 "Number of active kernel processes for async socket IO"); 427 428 static int soaio_target_procs = TARGET_AIO_PROCS; 429 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 430 &soaio_target_procs, 0, 431 "Preferred number of ready kernel processes for async socket IO"); 432 433 static int soaio_lifetime; 434 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 435 "Maximum lifetime for idle aiod"); 436 437 static void 438 soaio_kproc_loop(void *arg) 439 { 440 struct proc *p; 441 struct vmspace *myvm; 442 struct task *task; 443 int error, id, pending; 444 445 id = (intptr_t)arg; 446 447 /* 448 * Grab an extra reference on the daemon's vmspace so that it 449 * doesn't get freed by jobs that switch to a different 450 * vmspace. 451 */ 452 p = curproc; 453 myvm = vmspace_acquire_ref(p); 454 455 mtx_lock(&soaio_jobs_lock); 456 MPASS(soaio_starting > 0); 457 soaio_starting--; 458 for (;;) { 459 while (!STAILQ_EMPTY(&soaio_jobs)) { 460 task = STAILQ_FIRST(&soaio_jobs); 461 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 462 soaio_queued--; 463 pending = task->ta_pending; 464 task->ta_pending = 0; 465 mtx_unlock(&soaio_jobs_lock); 466 467 task->ta_func(task->ta_context, pending); 468 469 mtx_lock(&soaio_jobs_lock); 470 } 471 MPASS(soaio_queued == 0); 472 473 if (p->p_vmspace != myvm) { 474 mtx_unlock(&soaio_jobs_lock); 475 vmspace_switch_aio(myvm); 476 mtx_lock(&soaio_jobs_lock); 477 continue; 478 } 479 480 soaio_idle++; 481 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 482 soaio_lifetime); 483 soaio_idle--; 484 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 485 soaio_num_procs > soaio_target_procs) 486 break; 487 } 488 soaio_num_procs--; 489 mtx_unlock(&soaio_jobs_lock); 490 free_unr(soaio_kproc_unr, id); 491 kproc_exit(0); 492 } 493 494 static void 495 soaio_kproc_create(void *context, int pending) 496 { 497 struct proc *p; 498 int error, id; 499 500 mtx_lock(&soaio_jobs_lock); 501 for (;;) { 502 if (soaio_num_procs < soaio_target_procs) { 503 /* Must create */ 504 } else if (soaio_num_procs >= soaio_max_procs) { 505 /* 506 * Hit the limit on kernel processes, don't 507 * create another one. 508 */ 509 break; 510 } else if (soaio_queued <= soaio_idle + soaio_starting) { 511 /* 512 * No more AIO jobs waiting for a process to be 513 * created, so stop. 514 */ 515 break; 516 } 517 soaio_starting++; 518 mtx_unlock(&soaio_jobs_lock); 519 520 id = alloc_unr(soaio_kproc_unr); 521 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 522 &p, 0, 0, "soaiod%d", id); 523 if (error != 0) { 524 free_unr(soaio_kproc_unr, id); 525 mtx_lock(&soaio_jobs_lock); 526 soaio_starting--; 527 break; 528 } 529 530 mtx_lock(&soaio_jobs_lock); 531 soaio_num_procs++; 532 } 533 mtx_unlock(&soaio_jobs_lock); 534 } 535 536 void 537 soaio_enqueue(struct task *task) 538 { 539 540 mtx_lock(&soaio_jobs_lock); 541 MPASS(task->ta_pending == 0); 542 task->ta_pending++; 543 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 544 soaio_queued++; 545 if (soaio_queued <= soaio_idle) 546 wakeup_one(&soaio_idle); 547 else if (soaio_num_procs < soaio_max_procs) 548 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 549 mtx_unlock(&soaio_jobs_lock); 550 } 551 552 static void 553 soaio_init(void) 554 { 555 556 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 557 STAILQ_INIT(&soaio_jobs); 558 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 559 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 560 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 561 if (soaio_target_procs > 0) 562 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 563 } 564 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 565 566 static __inline int 567 soaio_ready(struct socket *so, struct sockbuf *sb) 568 { 569 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 570 } 571 572 static void 573 soaio_process_job(struct socket *so, struct sockbuf *sb, struct kaiocb *job) 574 { 575 struct ucred *td_savedcred; 576 struct thread *td; 577 struct file *fp; 578 struct uio uio; 579 struct iovec iov; 580 size_t cnt, done; 581 long ru_before; 582 int error, flags; 583 584 SOCKBUF_UNLOCK(sb); 585 aio_switch_vmspace(job); 586 td = curthread; 587 fp = job->fd_file; 588 retry: 589 td_savedcred = td->td_ucred; 590 td->td_ucred = job->cred; 591 592 done = job->aio_done; 593 cnt = job->uaiocb.aio_nbytes - done; 594 iov.iov_base = (void *)((uintptr_t)job->uaiocb.aio_buf + done); 595 iov.iov_len = cnt; 596 uio.uio_iov = &iov; 597 uio.uio_iovcnt = 1; 598 uio.uio_offset = 0; 599 uio.uio_resid = cnt; 600 uio.uio_segflg = UIO_USERSPACE; 601 uio.uio_td = td; 602 flags = MSG_NBIO; 603 604 /* 605 * For resource usage accounting, only count a completed request 606 * as a single message to avoid counting multiple calls to 607 * sosend/soreceive on a blocking socket. 608 */ 609 610 if (sb == &so->so_rcv) { 611 uio.uio_rw = UIO_READ; 612 ru_before = td->td_ru.ru_msgrcv; 613 #ifdef MAC 614 error = mac_socket_check_receive(fp->f_cred, so); 615 if (error == 0) 616 617 #endif 618 error = soreceive(so, NULL, &uio, NULL, NULL, &flags); 619 if (td->td_ru.ru_msgrcv != ru_before) 620 job->msgrcv = 1; 621 } else { 622 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 623 flags |= MSG_MORETOCOME; 624 uio.uio_rw = UIO_WRITE; 625 ru_before = td->td_ru.ru_msgsnd; 626 #ifdef MAC 627 error = mac_socket_check_send(fp->f_cred, so); 628 if (error == 0) 629 #endif 630 error = sosend(so, NULL, &uio, NULL, NULL, flags, td); 631 if (td->td_ru.ru_msgsnd != ru_before) 632 job->msgsnd = 1; 633 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 634 PROC_LOCK(job->userproc); 635 kern_psignal(job->userproc, SIGPIPE); 636 PROC_UNLOCK(job->userproc); 637 } 638 } 639 640 done += cnt - uio.uio_resid; 641 job->aio_done = done; 642 td->td_ucred = td_savedcred; 643 644 if (error == EWOULDBLOCK) { 645 /* 646 * The request was either partially completed or not 647 * completed at all due to racing with a read() or 648 * write() on the socket. If the socket is 649 * non-blocking, return with any partial completion. 650 * If the socket is blocking or if no progress has 651 * been made, requeue this request at the head of the 652 * queue to try again when the socket is ready. 653 */ 654 MPASS(done != job->uaiocb.aio_nbytes); 655 SOCKBUF_LOCK(sb); 656 if (done == 0 || !(so->so_state & SS_NBIO)) { 657 empty_results++; 658 if (soaio_ready(so, sb)) { 659 empty_retries++; 660 SOCKBUF_UNLOCK(sb); 661 goto retry; 662 } 663 664 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 665 SOCKBUF_UNLOCK(sb); 666 if (done != 0) 667 aio_complete(job, done, 0); 668 else 669 aio_cancel(job); 670 SOCKBUF_LOCK(sb); 671 } else { 672 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 673 } 674 return; 675 } 676 SOCKBUF_UNLOCK(sb); 677 } 678 if (done != 0 && (error == ERESTART || error == EINTR || 679 error == EWOULDBLOCK)) 680 error = 0; 681 if (error) 682 aio_complete(job, -1, error); 683 else 684 aio_complete(job, done, 0); 685 SOCKBUF_LOCK(sb); 686 } 687 688 static void 689 soaio_process_sb(struct socket *so, struct sockbuf *sb) 690 { 691 struct kaiocb *job; 692 693 SOCKBUF_LOCK(sb); 694 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 695 job = TAILQ_FIRST(&sb->sb_aiojobq); 696 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 697 if (!aio_clear_cancel_function(job)) 698 continue; 699 700 soaio_process_job(so, sb, job); 701 } 702 703 /* 704 * If there are still pending requests, the socket must not be 705 * ready so set SB_AIO to request a wakeup when the socket 706 * becomes ready. 707 */ 708 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 709 sb->sb_flags |= SB_AIO; 710 sb->sb_flags &= ~SB_AIO_RUNNING; 711 SOCKBUF_UNLOCK(sb); 712 713 SOCK_LOCK(so); 714 sorele(so); 715 } 716 717 void 718 soaio_rcv(void *context, int pending) 719 { 720 struct socket *so; 721 722 so = context; 723 soaio_process_sb(so, &so->so_rcv); 724 } 725 726 void 727 soaio_snd(void *context, int pending) 728 { 729 struct socket *so; 730 731 so = context; 732 soaio_process_sb(so, &so->so_snd); 733 } 734 735 void 736 sowakeup_aio(struct socket *so, struct sockbuf *sb) 737 { 738 739 SOCKBUF_LOCK_ASSERT(sb); 740 sb->sb_flags &= ~SB_AIO; 741 if (sb->sb_flags & SB_AIO_RUNNING) 742 return; 743 sb->sb_flags |= SB_AIO_RUNNING; 744 if (sb == &so->so_snd) 745 SOCK_LOCK(so); 746 soref(so); 747 if (sb == &so->so_snd) 748 SOCK_UNLOCK(so); 749 soaio_enqueue(&sb->sb_aiotask); 750 } 751 752 static void 753 soo_aio_cancel(struct kaiocb *job) 754 { 755 struct socket *so; 756 struct sockbuf *sb; 757 long done; 758 int opcode; 759 760 so = job->fd_file->f_data; 761 opcode = job->uaiocb.aio_lio_opcode; 762 if (opcode == LIO_READ) 763 sb = &so->so_rcv; 764 else { 765 MPASS(opcode == LIO_WRITE); 766 sb = &so->so_snd; 767 } 768 769 SOCKBUF_LOCK(sb); 770 if (!aio_cancel_cleared(job)) 771 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 772 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 773 sb->sb_flags &= ~SB_AIO; 774 SOCKBUF_UNLOCK(sb); 775 776 done = job->aio_done; 777 if (done != 0) 778 aio_complete(job, done, 0); 779 else 780 aio_cancel(job); 781 } 782 783 static int 784 soo_aio_queue(struct file *fp, struct kaiocb *job) 785 { 786 struct socket *so; 787 struct sockbuf *sb; 788 int error; 789 790 so = fp->f_data; 791 error = (*so->so_proto->pr_usrreqs->pru_aio_queue)(so, job); 792 if (error == 0) 793 return (0); 794 795 switch (job->uaiocb.aio_lio_opcode) { 796 case LIO_READ: 797 sb = &so->so_rcv; 798 break; 799 case LIO_WRITE: 800 sb = &so->so_snd; 801 break; 802 default: 803 return (EINVAL); 804 } 805 806 SOCKBUF_LOCK(sb); 807 if (!aio_set_cancel_function(job, soo_aio_cancel)) 808 panic("new job was cancelled"); 809 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 810 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 811 if (soaio_ready(so, sb)) 812 sowakeup_aio(so, sb); 813 else 814 sb->sb_flags |= SB_AIO; 815 } 816 SOCKBUF_UNLOCK(sb); 817 return (0); 818 } 819