1 /* 2 * 3 * Copyright (c) International Business Machines Corp., 2001 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 /* 21 * FILE : lftest.c 22 * DESCRIPTION : The purpose of this test is to verify the file size limitations of a filesystem. 23 * It writes one buffer at a time and lseeks from the beginning of the file to the 24 * end of the last write position. The intent is to test lseek64. 25 * HISTORY: 26 * 06/19/01 : Written by Jeff Martin(martinjn (at) us.ibm.com) to test large files on jfs. 27 * 07/12/01 : Added timing. 28 * 29 */ 30 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <sys/types.h> 34 #include <sys/stat.h> 35 #include <unistd.h> 36 #include <fcntl.h> 37 #include <time.h> 38 39 /* set write buffer size to whatever floats your boat. I usually use 1M */ 40 #define BSIZE 1048576L 41 char buf[BSIZE]; 42 43 int main(int argc, char *argv[]) 44 { 45 off_t i; 46 long bufnum; 47 off_t fd; 48 time_t time1, time2; 49 int writecnt = 0, seekcnt = 0, diff; 50 51 time1 = time(NULL); 52 53 if (argc != 2 || atoi(argv[1]) < 1) { 54 printf("usage:<# of %ld buffers to write>\n", BSIZE); 55 exit(3); 56 } 57 bufnum = strtol(argv[1], NULL, 0); 58 printf("Started building a %lu megabyte file @ %s\n", bufnum, 59 asctime(localtime(&time1))); 60 61 buf[0] = 'A'; 62 for (i = 1; i < BSIZE; i++) 63 buf[i] = '0'; 64 buf[BSIZE - 1] = 'Z'; 65 66 if ((fd = creat("large_file", 0755)) == -1) 67 perror("lftest: "); 68 69 for (i = 0; i < bufnum; i++) { 70 if (write(fd, buf, BSIZE) == -1) 71 return -1; 72 else { 73 printf("."); 74 writecnt++; 75 fflush(stdout); 76 } 77 fsync(fd); 78 if (lseek(fd, (i + 1) * BSIZE, 0) == -1) 79 return -1; 80 else 81 seekcnt++; 82 } 83 close(fd); 84 time2 = time(NULL); 85 printf("\nFinished building a %lu megabyte file @ %s\n", bufnum, 86 asctime(localtime(&time2))); 87 diff = time2 - time1; 88 printf("Number of Writes: %d\n" 89 "Number of Seeks: %d\n" 90 "Total time for test to run: %d minute(s) and %d seconds\n", 91 writecnt, seekcnt, diff / 60, diff % 60); 92 93 return 0; 94 } 95
