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/*
* libhugetlbfs - Easy use of Linux hugepages
* Copyright (C) 20015 Mike Kravetz, Oracle Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _GNU_SOURCE
#include <linux/falloc.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <linux/falloc.h>
#include <hugetlbfs.h>
#include "hugetests.h"
#define P "fallocate-basic"
#define DESC \
"* Test basic fallocate functionality in hugetlbfs. Preallocate *\n"\
"* huge pages to a file in hugetlbfs, and then remove the pages *\n"\
"* via hole punch. *"
#define min(a,b) (((a) < (b)) ? (a) : (b))
#define MAX_PAGES_TO_USE 5
int main(int argc, char *argv[])
{
long hpage_size;
long nr_hpages_free;
int fd;
int err;
int max_iterations;
unsigned long free_before, free_after;
test_init(argc, argv);
hpage_size = check_hugepagesize();
nr_hpages_free = get_huge_page_counter(hpage_size, HUGEPAGES_FREE);
max_iterations = min(nr_hpages_free, MAX_PAGES_TO_USE);
fd = hugetlbfs_unlinked_fd();
if (fd < 0)
FAIL("hugetlbfs_unlinked_fd()");
free_before = get_huge_page_counter(hpage_size, HUGEPAGES_FREE);
/* First preallocate file with max_iterations pages */
err = fallocate(fd, 0, 0, hpage_size * max_iterations);
if (err) {
if (errno == EOPNOTSUPP)
IRRELEVANT();
if (err)
FAIL("fallocate(): %s", strerror(errno));
}
free_after = get_huge_page_counter(hpage_size, HUGEPAGES_FREE);
if (free_before - free_after != max_iterations)
FAIL("fallocate did not preallocate %u huge pages\n",
max_iterations);
/* Now punch a hole of the same size */
err = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
0, hpage_size * max_iterations);
if (err)
FAIL("fallocate(FALLOC_FL_PUNCH_HOLE): %s", strerror(errno));
free_after = get_huge_page_counter(hpage_size, HUGEPAGES_FREE);
if (free_after != free_before)
FAIL("fallocate hole punch did not release %u huge pages\n",
max_iterations);
PASS();
}
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