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/*
* fallocate - utility to use the fallocate system call
*
* Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
* Written by Eric Sandeen <sandeen@redhat.com>
* Karel Zak <kzak@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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/stat.h>
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <err.h>
#include <limits.h>
#ifndef HAVE_FALLOCATE
# include <sys/syscall.h>
#endif
#include <linux/falloc.h> /* for FALLOC_FL_* flags */
#include "nls.h"
static void __attribute__((__noreturn__)) usage(FILE *out)
{
fprintf(out, _("Usage: %s [options] <filename>\n\nOptions:\n"),
program_invocation_short_name);
fprintf(out, _(
" -h, --help this help\n"
" -n, --keep-size don't modify the length of the file\n"
" -o, --offset <num> offset of the allocation, in bytes\n"
" -l, --length <num> length of the allocation, in bytes\n"));
fprintf(out, _("\nFor more information see fallocate(1).\n"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
#define EXABYTES(x) ((x) << 60)
#define PETABYTES(x) ((x) << 50)
#define TERABYTES(x) ((x) << 40)
#define GIGABYTES(x) ((x) << 30)
#define MEGABYTES(x) ((x) << 20)
#define KILOBYTES(x) ((x) << 10)
static loff_t cvtnum(char *s)
{
loff_t i;
char *sp;
errno = 0;
i = strtoll(s, &sp, 0);
if ((errno == ERANGE && (i == LLONG_MAX || i == LLONG_MIN)) ||
(errno != 0 && i == 0))
return -1LL;
if (i == 0 && sp == s)
return -1LL;
if (*sp == '\0')
return i;
if (sp[1] != '\0')
return -1LL;
switch (tolower(*sp)) {
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)
{
char *fname;
int c;
int error;
int fd;
int mode = 0;
loff_t length = -2LL;
loff_t offset = 0;
struct option longopts[] = {
{ "help", 0, 0, 'h' },
{ "keep-size", 0, 0, 'n' },
{ "offset", 1, 0, 'o' },
{ "lenght", 1, 0, 'l' },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
while ((c = getopt_long(argc, argv, "hnl:o:", longopts, NULL)) != -1) {
switch(c) {
case 'h':
usage(stdout);
break;
case 'n':
mode |= FALLOC_FL_KEEP_SIZE;
break;
case 'l':
length = cvtnum(optarg);
break;
case 'o':
offset = cvtnum(optarg);
break;
default:
usage(stderr);
break;
}
}
if (length == -2LL)
errx(EXIT_FAILURE, _("no length argument specified"));
if (length <= 0)
errx(EXIT_FAILURE, _("invalid length value specified"));
if (offset < 0)
errx(EXIT_FAILURE, _("invalid offset value specified"));
if (optind == argc)
errx(EXIT_FAILURE, _("no filename specified."));
fname = argv[optind++];
fd = open(fname, O_WRONLY|O_CREAT, 0644);
if (fd < 0)
err(EXIT_FAILURE, _("%s: open failed"), fname);
#ifdef HAVE_FALLOCATE
error = fallocate(fd, mode, offset, length);
#else
error = syscall(SYS_fallocate, fd, mode, offset, length);
#endif
/*
* EOPNOTSUPP: The FALLOC_FL_KEEP_SIZE is unsupported
* ENOSYS: The filesystem does not support sys_fallocate
*/
if (error < 0) {
if ((mode & FALLOC_FL_KEEP_SIZE) && errno == EOPNOTSUPP)
errx(EXIT_FAILURE,
_("keep size mode (-n option) unsupported"));
err(EXIT_FAILURE, _("%s: fallocate failed"), fname);
}
close(fd);
return EXIT_SUCCESS;
}
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