[thirdparty/util-linux.git] / sys-utils / fallocate.c

/*
 * 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"
#include "strtosize.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);
}

static loff_t cvtnum(char *s)
{
	uintmax_t x;

	if (strtosize(s, &x))
		return -1LL;

	return x;
}

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;
}
Commit	Line	Data
d46a5499 KZ	1	/*
	2	* fallocate - utility to use the fallocate system call
	3	*
	4	* Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
	5	* Written by Eric Sandeen <sandeen@redhat.com>
	6	* Karel Zak <kzak@redhat.com>
	7	*
	8	* cvtnum routine taken from xfsprogs,
	9	* Copyright (c) 2003-2005 Silicon Graphics, Inc.
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License as
	13	* published by the Free Software Foundation.
	14	*
	15	* This program is distributed in the hope that it would be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software Foundation,
	22	* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*/
	24	#include <sys/stat.h>
	25	#include <sys/types.h>
	26	#include <ctype.h>
	27	#include <errno.h>
	28	#include <fcntl.h>
	29	#include <stdio.h>
	30	#include <stdlib.h>
	31	#include <unistd.h>
	32	#include <getopt.h>
	33	#include <err.h>
6264af59	34	#include <limits.h>
d46a5499 KZ	35
	36	#ifndef HAVE_FALLOCATE
	37	# include <sys/syscall.h>
	38	#endif
	39
	40	#include <linux/falloc.h> /* for FALLOC_FL_* flags */
	41
	42	#include "nls.h"
3b6b039a	43	#include "strtosize.h"
d46a5499 KZ	44
	45
	46	static void __attribute__((__noreturn__)) usage(FILE *out)
	47	{
	48	fprintf(out, _("Usage: %s [options] <filename>\n\nOptions:\n"),
	49	program_invocation_short_name);
	50
	51	fprintf(out, _(
	52	" -h, --help this help\n"
	53	" -n, --keep-size don't modify the length of the file\n"
	54	" -o, --offset <num> offset of the allocation, in bytes\n"
	55	" -l, --length <num> length of the allocation, in bytes\n"));
	56
	57	fprintf(out, _("\nFor more information see fallocate(1).\n"));
	58
	59	exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
	60	}
	61
d46a5499 KZ	62	static loff_t cvtnum(char *s)
d46a5499 KZ	63	{
3b6b039a	64	uintmax_t x;
6264af59	65
3b6b039a	66	if (strtosize(s, &x))
d46a5499	67	return -1LL;
d46a5499	68
3b6b039a	69	return x;
d46a5499 KZ	70	}
	71
	72	int main(int argc, char **argv)
	73	{
	74	char *fname;
	75	int c;
	76	int error;
	77	int fd;
	78	int mode = 0;
	79	loff_t length = -2LL;
	80	loff_t offset = 0;
	81
	82	struct option longopts[] = {
	83	{ "help", 0, 0, 'h' },
	84	{ "keep-size", 0, 0, 'n' },
	85	{ "offset", 1, 0, 'o' },
	86	{ "lenght", 1, 0, 'l' },
	87	{ NULL, 0, 0, 0 }
	88	};
	89
	90	setlocale(LC_ALL, "");
	91	bindtextdomain(PACKAGE, LOCALEDIR);
	92	textdomain(PACKAGE);
	93
	94	while ((c = getopt_long(argc, argv, "hnl:o:", longopts, NULL)) != -1) {
	95	switch(c) {
	96	case 'h':
	97	usage(stdout);
	98	break;
	99	case 'n':
	100	mode \|= FALLOC_FL_KEEP_SIZE;
	101	break;
	102	case 'l':
	103	length = cvtnum(optarg);
	104	break;
	105	case 'o':
	106	offset = cvtnum(optarg);
	107	break;
	108	default:
	109	usage(stderr);
	110	break;
	111	}
	112	}
	113
	114	if (length == -2LL)
	115	errx(EXIT_FAILURE, _("no length argument specified"));
	116	if (length <= 0)
	117	errx(EXIT_FAILURE, _("invalid length value specified"));
	118	if (offset < 0)
	119	errx(EXIT_FAILURE, _("invalid offset value specified"));
	120	if (optind == argc)
	121	errx(EXIT_FAILURE, _("no filename specified."));
	122
	123	fname = argv[optind++];
	124
	125	fd = open(fname, O_WRONLY\|O_CREAT, 0644);
	126	if (fd < 0)
	127	err(EXIT_FAILURE, _("%s: open failed"), fname);
	128
	129	#ifdef HAVE_FALLOCATE
	130	error = fallocate(fd, mode, offset, length);
	131	#else
	132	error = syscall(SYS_fallocate, fd, mode, offset, length);
	133	#endif
134	/*
135	* EOPNOTSUPP: The FALLOC_FL_KEEP_SIZE is unsupported
136	* ENOSYS: The filesystem does not support sys_fallocate
137	*/
138	if (error < 0) {
139	if ((mode & FALLOC_FL_KEEP_SIZE) && errno == EOPNOTSUPP)
140	errx(EXIT_FAILURE,
141	_("keep size mode (-n option) unsupported"));
142	err(EXIT_FAILURE, _("%s: fallocate failed"), fname);
143	}
144
145	close(fd);
146	return EXIT_SUCCESS;
147	}