148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2021 by Lawrence Livermore National Security, LLC.
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <errno.h>
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static void
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seek_data(int fd, off_t offset, off_t expected)
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{
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off_t data_offset = lseek(fd, offset, SEEK_DATA);
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if (data_offset != expected) {
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fprintf(stderr, "lseek(fd, %d, SEEK_DATA) = %d (expected %d)\n",
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(int)offset, (int)data_offset, (int)expected);
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exit(2);
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}
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}
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static void
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seek_hole(int fd, off_t offset, off_t expected)
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{
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off_t hole_offset = lseek(fd, offset, SEEK_HOLE);
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if (hole_offset != expected) {
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fprintf(stderr, "lseek(fd, %d, SEEK_HOLE) = %d (expected %d)\n",
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(int)offset, (int)hole_offset, (int)expected);
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exit(2);
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}
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}
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int
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main(int argc, char **argv)
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{
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char *execname = argv[0];
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char *file_path = argv[1];
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char *buf = NULL;
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int err;
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if (argc != 4) {
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(void) printf("usage: %s <file name> <file size> "
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"<block size>\n", argv[0]);
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exit(1);
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}
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int fd = open(file_path, O_RDWR | O_CREAT, 0666);
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if (fd == -1) {
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(void) fprintf(stderr, "%s: %s: ", execname, file_path);
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perror("open");
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exit(2);
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}
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off_t file_size = atoi(argv[2]);
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off_t block_size = atoi(argv[3]);
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if (block_size * 2 > file_size) {
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(void) fprintf(stderr, "file size must be at least "
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"double the block size\n");
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exit(2);
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}
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err = ftruncate(fd, file_size);
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if (err == -1) {
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perror("ftruncate");
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exit(2);
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}
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if ((buf = mmap(NULL, file_size, PROT_READ | PROT_WRITE,
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MAP_SHARED, fd, 0)) == MAP_FAILED) {
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perror("mmap");
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exit(2);
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}
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/* Verify the file is sparse and reports no data. */
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seek_data(fd, 0, -1);
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/* Verify the file is reported as a hole. */
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seek_hole(fd, 0, 0);
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/* Verify search beyond end of file is an error. */
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seek_data(fd, 2 * file_size, -1);
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seek_hole(fd, 2 * file_size, -1);
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/* Dirty the first byte. */
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memset(buf, 'a', 1);
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seek_data(fd, 0, 0);
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seek_data(fd, block_size, -1);
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seek_hole(fd, 0, block_size);
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seek_hole(fd, block_size, block_size);
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/* Dirty the first half of the file. */
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memset(buf, 'b', file_size / 2);
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seek_data(fd, 0, 0);
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seek_data(fd, block_size, block_size);
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seek_hole(fd, 0, P2ROUNDUP(file_size / 2, block_size));
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seek_hole(fd, block_size, P2ROUNDUP(file_size / 2, block_size));
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/* Dirty the whole file. */
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memset(buf, 'c', file_size);
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seek_data(fd, 0, 0);
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seek_data(fd, file_size * 3 / 4,
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P2ROUNDUP(file_size * 3 / 4, block_size));
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seek_hole(fd, 0, file_size);
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seek_hole(fd, file_size / 2, file_size);
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/* Punch a hole (required compression be enabled). */
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memset(buf + block_size, 0, block_size);
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seek_data(fd, 0, 0);
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seek_data(fd, block_size, 2 * block_size);
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seek_hole(fd, 0, block_size);
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seek_hole(fd, block_size, block_size);
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seek_hole(fd, 2 * block_size, file_size);
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err = munmap(buf, file_size);
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if (err == -1) {
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perror("munmap");
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exit(2);
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}
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close(fd);
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return (0);
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}
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