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/*
* fallocate - utility to use the fallocate system call
*
* Copyright (C) 2008 Red Hat, Inc. All rights reserved.
* Written by Eric Sandeen <sandeen@redhat.com>
*
* cvtnum routine taken from xfsprogs,
* Copyright (c) 2003-2005 Silicon Graphics, Inc.
*
* 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 to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _LARGEFILE_SOURCE
#define _LARGEFILE_SOURCE
#endif
#ifndef _LARGEFILE64_SOURCE
#define _LARGEFILE64_SOURCE
#endif
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
// #include <linux/falloc.h>
#define FALLOC_FL_KEEP_SIZE 0x01
#define FALLOC_FL_PUNCH_HOLE 0x02 /* de-allocates range */
#define FALLOC_FL_COLLAPSE_RANGE 0x08
#define FALLOC_FL_ZERO_RANGE 0x10
void usage(void)
{
printf("Usage: fallocate [-npt] [-o offset] -l length filename\n");
exit(EXIT_FAILURE);
}
#define EXABYTES(x) ((long long)(x) << 60)
#define PETABYTES(x) ((long long)(x) << 50)
#define TERABYTES(x) ((long long)(x) << 40)
#define GIGABYTES(x) ((long long)(x) << 30)
#define MEGABYTES(x) ((long long)(x) << 20)
#define KILOBYTES(x) ((long long)(x) << 10)
long long
cvtnum(char *s)
{
long long i;
char *sp;
int c;
i = strtoll(s, &sp, 0);
if (i == 0 && sp == s)
return -1LL;
if (*sp == '\0')
return i;
if (sp[1] != '\0')
return -1LL;
c = tolower(*sp);
switch (c) {
case 'k':
return KILOBYTES(i);
case 'm':
return MEGABYTES(i);
case 'g':
return GIGABYTES(i);
case 't':
return TERABYTES(i);
case 'p':
return PETABYTES(i);
case 'e':
return EXABYTES(i);
}
return -1LL;
}
int main(int argc, char **argv)
{
int fd;
char *fname;
int opt;
ext2_loff_t length = -2LL;
ext2_loff_t offset = 0;
int falloc_mode = 0;
int error;
int tflag = 0;
while ((opt = getopt(argc, argv, "npl:o:tzc")) != -1) {
switch(opt) {
case 'n':
/* do not change filesize */
falloc_mode = FALLOC_FL_KEEP_SIZE;
break;
case 'p':
/* punch mode */
falloc_mode = (FALLOC_FL_PUNCH_HOLE |
FALLOC_FL_KEEP_SIZE);
break;
case 'c':
/* collapse range mode */
falloc_mode = (FALLOC_FL_COLLAPSE_RANGE |
FALLOC_FL_KEEP_SIZE);
break;
case 'z':
/* zero range mode */
falloc_mode = (FALLOC_FL_ZERO_RANGE |
FALLOC_FL_KEEP_SIZE);
break;
case 'l':
length = cvtnum(optarg);
break;
case 'o':
offset = cvtnum(optarg);
break;
case 't':
tflag++;
break;
default:
usage();
}
}
if (length == -2LL) {
printf("Error: no length argument specified\n");
usage();
}
if (length <= 0) {
printf("Error: invalid length value specified\n");
usage();
}
if (offset < 0) {
printf("Error: invalid offset value specified\n");
usage();
}
if (tflag && (falloc_mode & FALLOC_FL_KEEP_SIZE)) {
printf("-n and -t options incompatible\n");
usage();
}
if (tflag && offset) {
printf("-n and -o options incompatible\n");
usage();
}
if (optind == argc) {
printf("Error: no filename specified\n");
usage();
}
fname = argv[optind++];
/* Should we create the file if it doesn't already exist? */
fd = open(fname, O_WRONLY|O_LARGEFILE);
if (fd < 0) {
perror("Error opening file");
exit(EXIT_FAILURE);
}
if (tflag)
error = ftruncate(fd, length);
else
error = syscall(SYS_fallocate, fd, falloc_mode, offset, length);
if (error < 0) {
perror("fallocate failed");
exit(EXIT_FAILURE);
}
close(fd);
return 0;
}
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