| /* |
| * Copyright (c) 2000-2004 Silicon Graphics, Inc. |
| * 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 |
| */ |
| |
| /* |
| * Write a bunch of holes to create a bunch of extents. |
| */ |
| |
| #include "global.h" |
| |
| char *progname; |
| uint64_t num_holes = 1000; |
| uint64_t curr_holes; |
| int verbose_opt = 0; |
| char *filename; |
| int status_num = 100; |
| int wsync; |
| int preserve; |
| unsigned int blocksize; |
| uint64_t fileoffset; |
| |
| #define JUMP_SIZE (128 * 1024) |
| #define NUMHOLES_TO_SIZE(i) (i * JUMP_SIZE) |
| #define SIZE_TO_NUMHOLES(s) (s / JUMP_SIZE) |
| |
| void |
| usage(void) |
| { |
| fprintf(stderr, "%s [-b blocksize] [-n num-holes] [-s status-num]" |
| " [-o start-offset] [-vwp] file\n", progname); |
| exit(1); |
| } |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| int c; |
| int fd; |
| int oflags; |
| uint64_t i; |
| uint64_t offset; |
| int blocksize = 512; |
| unsigned char *buffer = NULL; |
| struct stat stat; |
| |
| progname = argv[0]; |
| |
| while ((c = getopt(argc, argv, "b:n:o:ps:vw")) != -1) { |
| switch (c) { |
| case 'b': |
| blocksize = atoi(optarg); |
| break; |
| case 'n': |
| num_holes = atoll(optarg); |
| break; |
| case 'v': |
| verbose_opt = 1; |
| break; |
| case 'w': |
| wsync = 1; |
| break; |
| case 'p': |
| preserve = 1; |
| break; |
| case 's': |
| status_num = atoi(optarg); |
| break; |
| case 'o': |
| fileoffset = strtoull(optarg, NULL, 16); |
| break; |
| case '?': |
| usage(); |
| } |
| } |
| if (optind == argc-1) |
| filename = argv[optind]; |
| else |
| usage(); |
| |
| buffer = malloc(blocksize); |
| if (buffer == NULL) { |
| fprintf(stderr, "%s: blocksize to big to allocate buffer\n", progname); |
| return 1; |
| } |
| |
| oflags = O_RDWR | O_CREAT; |
| oflags |= (preserve ? 0 : O_TRUNC) | |
| (wsync ? O_SYNC : 0); |
| |
| if ((fd = open(filename, oflags, 0666)) < 0) { |
| perror("open"); |
| return 1; |
| } |
| |
| if (fstat(fd, &stat) < 0) { |
| perror("stat"); |
| return 1; |
| } |
| if (preserve) { |
| curr_holes = SIZE_TO_NUMHOLES(stat.st_size); |
| if (num_holes < curr_holes) { |
| /* we need to truncate back */ |
| if (ftruncate(fd, NUMHOLES_TO_SIZE(num_holes)) < 0) { |
| perror("ftruncate"); |
| return 1; |
| } |
| if (verbose_opt) { |
| printf("truncating back to %llu\n", |
| (unsigned long long) |
| NUMHOLES_TO_SIZE(num_holes)); |
| } |
| return 0; |
| } |
| } |
| else { |
| curr_holes = 0; |
| } |
| if (curr_holes != 0 && verbose_opt) { |
| printf("creating %llu more holes\n", |
| (unsigned long long)num_holes - curr_holes); |
| } |
| |
| /* create holes by seeking and writing */ |
| for (i = curr_holes; i < num_holes; i++) { |
| |
| offset = NUMHOLES_TO_SIZE(i) + fileoffset; |
| |
| if (lseek64(fd, offset, SEEK_SET) < 0) { |
| perror("lseek"); |
| return 1; |
| } |
| |
| if (write(fd, buffer, blocksize) < blocksize) { |
| perror("write"); |
| return 1; |
| } |
| |
| if (verbose_opt && ((i+1) % status_num == 0)) { |
| printf("seeked and wrote %llu times\n", |
| (unsigned long long)i + 1); |
| } |
| } |
| |
| close(fd); |
| |
| return 0; |
| } |