| /* |
| * |
| * Copyright (c) International Business Machines Corp., 2001 |
| * |
| * 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; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program 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 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 to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| /* |
| * FILE : lftest.c |
| * DESCRIPTION : The purpose of this test is to verify the file size limitations of a filesystem. |
| * It writes one buffer at a time and lseeks from the beginning of the file to the |
| * end of the last write position. The intent is to test lseek64. |
| * HISTORY: |
| * 06/19/01 : Written by Jeff Martin(martinjn@us.ibm.com) to test large files on jfs. |
| * 07/12/01 : Added timing. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <time.h> |
| |
| /* set write buffer size to whatever floats your boat. I usually use 1M */ |
| #define BSIZE 1048576L |
| char buf[BSIZE]; |
| |
| int main(int argc, char *argv[]) |
| { |
| off_t i; |
| long bufnum; |
| off_t fd; |
| time_t time1, time2; |
| int writecnt = 0, seekcnt = 0, diff; |
| |
| time1 = time(NULL); |
| |
| if (argc != 2 || atoi(argv[1]) < 1) { |
| printf("usage:<# of %ld buffers to write>\n", BSIZE); |
| exit(3); |
| } |
| bufnum = strtol(argv[1], NULL, 0); |
| printf("Started building a %lu megabyte file @ %s\n", bufnum, |
| asctime(localtime(&time1))); |
| |
| buf[0] = 'A'; |
| for (i = 1; i < BSIZE; i++) |
| buf[i] = '0'; |
| buf[BSIZE - 1] = 'Z'; |
| |
| if ((fd = creat("large_file", 0755)) == -1) |
| perror("lftest: "); |
| |
| for (i = 0; i < bufnum; i++) { |
| if (write(fd, buf, BSIZE) == -1) |
| return -1; |
| else { |
| printf("."); |
| writecnt++; |
| fflush(stdout); |
| } |
| fsync(fd); |
| if (lseek(fd, (i + 1) * BSIZE, 0) == -1) |
| return -1; |
| else |
| seekcnt++; |
| } |
| close(fd); |
| time2 = time(NULL); |
| printf("\nFinished building a %lu megabyte file @ %s\n", bufnum, |
| asctime(localtime(&time2))); |
| diff = time2 - time1; |
| printf("Number of Writes: %d\n" |
| "Number of Seeks: %d\n" |
| "Total time for test to run: %d minute(s) and %d seconds\n", |
| writecnt, seekcnt, diff / 60, diff % 60); |
| |
| return 0; |
| } |