This behavior is already documented by the man page, and suggested by POSIX. Reviewed by: jhb MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D15099
217 lines
6.5 KiB
C
217 lines
6.5 KiB
C
/*-
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* Copyright (c) 2017 Spectra Logic Corp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/event.h>
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#include <aio.h>
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#include <fcntl.h>
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#include <semaphore.h>
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#include <stdlib.h>
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#include <atf-c.h>
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#include "local.h"
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#include "freebsd_test_suite/macros.h"
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static sem_t completions;
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static void
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handler(int sig __unused)
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{
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ATF_REQUIRE_EQ(0, sem_post(&completions));
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}
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static void
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thr_handler(union sigval sv __unused)
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{
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ATF_REQUIRE_EQ(0, sem_post(&completions));
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}
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/*
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* If lio_listio is unable to enqueue any requests at all, it should return
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* EAGAIN.
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*/
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ATF_TC_WITHOUT_HEAD(lio_listio_eagain_kevent);
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ATF_TC_BODY(lio_listio_eagain_kevent, tc)
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{
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int fd, i, j, kq, max_queue_per_proc, ios_per_call;
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size_t max_queue_per_proc_size;
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struct aiocb *aiocbs[2];
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struct aiocb **list[2];
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struct sigevent sev[2];
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char *buffer;
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const char *path="tempfile";
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void *udata[2];
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ATF_REQUIRE_KERNEL_MODULE("aio");
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ATF_REQUIRE_UNSAFE_AIO();
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max_queue_per_proc_size = sizeof(max_queue_per_proc);
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ATF_REQUIRE_EQ(sysctlbyname("vfs.aio.max_aio_queue_per_proc",
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&max_queue_per_proc, &max_queue_per_proc_size, NULL, 0), 0);
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ios_per_call = max_queue_per_proc;
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fd = open(path, O_RDWR|O_CREAT, 0666);
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ATF_REQUIRE(fd >= 0);
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kq = kqueue();
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ATF_REQUIRE(kq > 0);
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buffer = calloc(1, 4096);
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ATF_REQUIRE(buffer != NULL);
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/*
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* Call lio_listio twice, each with the maximum number of operations.
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* The first call should succeed and the second should fail.
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*/
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for (i = 0; i < 2; i++) {
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aiocbs[i] = calloc(ios_per_call, sizeof(struct aiocb));
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ATF_REQUIRE(aiocbs[i] != NULL);
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list[i] = calloc(ios_per_call, sizeof(struct aiocb*));
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ATF_REQUIRE(list[i] != NULL);
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udata[i] = (void*)((caddr_t)0xdead0000 + i);
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sev[i].sigev_notify = SIGEV_KEVENT;
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sev[i].sigev_notify_kqueue = kq;
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sev[i].sigev_value.sival_ptr = udata[i];
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for (j = 0; j < ios_per_call; j++) {
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aiocbs[i][j].aio_fildes = fd;
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aiocbs[i][j].aio_offset = (i * ios_per_call + j) * 4096;
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aiocbs[i][j].aio_buf = buffer;
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aiocbs[i][j].aio_nbytes = 4096;
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aiocbs[i][j].aio_lio_opcode = LIO_WRITE;
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list[i][j] = &aiocbs[i][j];
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}
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}
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ATF_REQUIRE_EQ(0, lio_listio(LIO_NOWAIT, list[0], ios_per_call, &sev[0]));
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ATF_REQUIRE_EQ(-1, lio_listio(LIO_NOWAIT, list[1], ios_per_call, &sev[1]));
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/*
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* The second lio_listio call should fail with EAGAIN. Bad timing may
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* mean that some requests did get enqueued, but the result should
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* still be EAGAIN.
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*/
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ATF_REQUIRE_EQ(errno, EAGAIN);
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}
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/* With LIO_WAIT, an empty lio_listio should return immediately */
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ATF_TC_WITHOUT_HEAD(lio_listio_empty_wait);
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ATF_TC_BODY(lio_listio_empty_wait, tc)
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{
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struct aiocb *list = NULL;
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ATF_REQUIRE_EQ(0, lio_listio(LIO_WAIT, &list, 0, NULL));
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}
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/*
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* With LIO_NOWAIT, an empty lio_listio should send completion notification
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* immediately
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*/
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ATF_TC_WITHOUT_HEAD(lio_listio_empty_nowait_kevent);
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ATF_TC_BODY(lio_listio_empty_nowait_kevent, tc)
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{
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struct aiocb *list = NULL;
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struct sigevent sev;
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struct kevent kq_returned;
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int kq, result;
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void *udata = (void*)0xdeadbeefdeadbeef;
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atf_tc_expect_timeout("Bug 220398 - lio_listio(2) never sends"
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" asynchronous notification if nent==0");
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kq = kqueue();
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ATF_REQUIRE(kq > 0);
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sev.sigev_notify = SIGEV_KEVENT;
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sev.sigev_notify_kqueue = kq;
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sev.sigev_value.sival_ptr = udata;
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ATF_REQUIRE_EQ(0, lio_listio(LIO_NOWAIT, &list, 0, &sev));
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result = kevent(kq, NULL, 0, &kq_returned, 1, NULL);
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ATF_REQUIRE_MSG(result == 1, "Never got completion notification");
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ATF_REQUIRE_EQ((uintptr_t)list, kq_returned.ident);
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ATF_REQUIRE_EQ(EVFILT_LIO, kq_returned.filter);
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ATF_REQUIRE_EQ(udata, kq_returned.udata);
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}
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/*
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* With LIO_NOWAIT, an empty lio_listio should send completion notification
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* immediately
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*/
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ATF_TC_WITHOUT_HEAD(lio_listio_empty_nowait_signal);
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ATF_TC_BODY(lio_listio_empty_nowait_signal, tc)
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{
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struct aiocb *list = NULL;
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struct sigevent sev;
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atf_tc_expect_timeout("Bug 220398 - lio_listio(2) never sends"
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" asynchronous notification if nent==0");
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ATF_REQUIRE_EQ(0, sem_init(&completions, false, 0));
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sev.sigev_notify = SIGEV_SIGNAL;
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sev.sigev_signo = SIGUSR1;
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ATF_REQUIRE(SIG_ERR != signal(SIGUSR1, handler));
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ATF_REQUIRE_EQ(0, lio_listio(LIO_NOWAIT, &list, 0, &sev));
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ATF_REQUIRE_EQ(0, sem_wait(&completions));
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ATF_REQUIRE_EQ(0, sem_destroy(&completions));
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}
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/*
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* With LIO_NOWAIT, an empty lio_listio should send completion notification
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* immediately
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*/
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ATF_TC_WITHOUT_HEAD(lio_listio_empty_nowait_thread);
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ATF_TC_BODY(lio_listio_empty_nowait_thread, tc)
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{
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struct aiocb *list = NULL;
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struct sigevent sev;
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atf_tc_expect_timeout("Bug 220398 - lio_listio(2) never sends"
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" asynchronous notification if nent==0");
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ATF_REQUIRE_EQ(0, sem_init(&completions, false, 0));
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bzero(&sev, sizeof(sev));
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sev.sigev_notify = SIGEV_THREAD;
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sev.sigev_notify_function = thr_handler;
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sev.sigev_notify_attributes = NULL;
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ATF_REQUIRE_MSG(0 == lio_listio(LIO_NOWAIT, &list, 0, &sev),
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"lio_listio: %s", strerror(errno));
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ATF_REQUIRE_EQ(0, sem_wait(&completions));
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ATF_REQUIRE_EQ(0, sem_destroy(&completions));
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, lio_listio_eagain_kevent);
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ATF_TP_ADD_TC(tp, lio_listio_empty_nowait_kevent);
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ATF_TP_ADD_TC(tp, lio_listio_empty_nowait_signal);
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ATF_TP_ADD_TC(tp, lio_listio_empty_nowait_thread);
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ATF_TP_ADD_TC(tp, lio_listio_empty_wait);
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return (atf_no_error());
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}
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