--- /dev/null
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+static pthread_barrier_t barrier;
+
+static unsigned long extent_size;
+static unsigned long num_extents;
+
+struct dio_thread_data {
+ int fd;
+ int thread_id;
+};
+
+static void *dio_thread(void *arg)
+{
+ struct dio_thread_data *data = arg;
+ off_t off;
+ ssize_t ret;
+ void *buf;
+
+ if ((errno = posix_memalign(&buf, extent_size / 2, extent_size / 2))) {
+ perror("malloc");
+ return NULL;
+ }
+ memset(buf, 0, extent_size / 2);
+
+ off = (num_extents - 1) * extent_size;
+ if (data->thread_id)
+ off += extent_size / 2;
+ while (off >= 0) {
+ pthread_barrier_wait(&barrier);
+
+ ret = pread(data->fd, buf, extent_size / 2, off);
+ if (ret == -1)
+ perror("pread");
+
+ off -= extent_size;
+ }
+
+ free(buf);
+ return NULL;
+}
+
+int main(int argc, char **argv)
+{
+ struct dio_thread_data data[2];
+ pthread_t thread;
+ int fd;
+
+ if (argc != 4) {
+ fprintf(stderr, "usage: %s EXTENT_SIZE NUM_EXTENTS PATH\n",
+ argv[0]);
+ return EXIT_FAILURE;
+ }
+
+ extent_size = strtoul(argv[1], NULL, 0);
+ num_extents = strtoul(argv[2], NULL, 0);
+
+ errno = pthread_barrier_init(&barrier, NULL, 2);
+ if (errno) {
+ perror("pthread_barrier_init");
+ return EXIT_FAILURE;
+ }
+
+ fd = open(argv[3], O_RDONLY | O_DIRECT);
+ if (fd == -1) {
+ perror("open");
+ return EXIT_FAILURE;
+ }
+
+ data[0].fd = fd;
+ data[0].thread_id = 0;
+ errno = pthread_create(&thread, NULL, dio_thread, &data[0]);
+ if (errno) {
+ perror("pthread_create");
+ close(fd);
+ return EXIT_FAILURE;
+ }
+
+ data[1].fd = fd;
+ data[1].thread_id = 1;
+ dio_thread(&data[1]);
+
+ pthread_join(thread, NULL);
+
+ close(fd);
+ return EXIT_SUCCESS;
+}
--- /dev/null
+#! /bin/bash
+# FS QA Test 391
+#
+# Test two threads doing non-overlapping direct I/O in the same extents.
+# Motivated by a bug in Btrfs' direct I/O get_block function which would lead
+# to spurious -EEXIST failures from direct I/O reads.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2016 Facebook. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+ cd /
+ rm -f $tmp.*
+ rm -f "$testfile"
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+_supported_fs generic
+_supported_os Linux
+_require_test
+_require_xfs_io_command "falloc"
+_require_test_program "dio-interleaved"
+
+extent_size="$(($(get_block_size "$TEST_DIR") * 2))"
+num_extents=1024
+testfile="$TEST_DIR/$$-testfile"
+
+$XFS_IO_PROG -fc "truncate 0" "$testfile"
+for ((off = 0; off < num_extents * extent_size; off += extent_size)); do
+ $XFS_IO_PROG -c "falloc $off $extent_size" "$testfile"
+done
+
+# To reproduce the Btrfs bug, the extent map must not be cached in memory.
+sync
+echo 3 > /proc/sys/vm/drop_caches
+
+"$here/src/dio-interleaved" "$extent_size" "$num_extents" "$testfile"
+
+echo "Silence is golden"
+
+# success, all done
+status=0
+exit
projects / users / hch / xfstests-dev.git / commitdiff