resize/main.c - platform/external/e2fsprogs - Git at Google

 /*
  * main.c --- ext2 resizer main program
  *
  * Copyright (C) 1997, 1998 by Theodore Ts'o and
  * 	PowerQuest, Inc.
  *
  * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o
  *
  * %Begin-Header%
  * This file may be redistributed under the terms of the GNU Public
  * License.
  * %End-Header%
  */

 #define _LARGEFILE_SOURCE
 #define _LARGEFILE64_SOURCE

 #ifdef HAVE_GETOPT_H
 #include <getopt.h>
 #else
 extern char *optarg;
 extern int optind;
 #endif
 #include <unistd.h>
 #ifdef HAVE_STDLIB_H
 #include <stdlib.h>
 #endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>

 #include "e2p/e2p.h"

 #include "resize2fs.h"

 #include "../version.h"

 char *program_name, *device_name, *io_options;

 static void usage (char *prog)
 {
 	fprintf (stderr, _("Usage: %s [-d debug_flags] [-f] [-F] [-M] [-P] "
 			   "[-p] device [new_size]\n\n"), prog);

 	exit (1);
 }

 static errcode_t resize_progress_func(ext2_resize_t rfs, int pass,
 				      unsigned long cur, unsigned long max)
 {
 	ext2_sim_progmeter progress;
 	const char	*label;
 	errcode_t	retval;

 	progress = (ext2_sim_progmeter) rfs->prog_data;
 	if (max == 0)
 		return 0;
 	if (cur == 0) {
 		if (progress)
 			ext2fs_progress_close(progress);
 		progress = 0;
 		switch (pass) {
 		case E2_RSZ_EXTEND_ITABLE_PASS:
 			label = _("Extending the inode table");
 			break;
 		case E2_RSZ_BLOCK_RELOC_PASS:
 			label = _("Relocating blocks");
 			break;
 		case E2_RSZ_INODE_SCAN_PASS:
 			label = _("Scanning inode table");
 			break;
 		case E2_RSZ_INODE_REF_UPD_PASS:
 			label = _("Updating inode references");
 			break;
 		case E2_RSZ_MOVE_ITABLE_PASS:
 			label = _("Moving inode table");
 			break;
 		default:
 			label = _("Unknown pass?!?");
 			break;
 		}
 		printf(_("Begin pass %d (max = %lu)\n"), pass, max);
 		retval = ext2fs_progress_init(&progress, label, 30,
 					      40, max, 0);
 		if (retval)
 			progress = 0;
 		rfs->prog_data = (void *) progress;
 	}
 	if (progress)
 		ext2fs_progress_update(progress, cur);
 	if (cur >= max) {
 		if (progress)
 			ext2fs_progress_close(progress);
 		progress = 0;
 		rfs->prog_data = 0;
 	}
 	return 0;
 }

 static void determine_fs_stride(ext2_filsys fs)
 {
 	unsigned int	group;
 	unsigned long long sum;
 	unsigned int	has_sb, prev_has_sb, num;
 	int		i_stride, b_stride;

 	if (fs->stride)
 		return;
 	num = 0; sum = 0;
 	for (group = 0; group < fs->group_desc_count; group++) {
 		has_sb = ext2fs_bg_has_super(fs, group);
 		if (group == 0 || has_sb != prev_has_sb)
 			goto next;
 		b_stride = fs->group_desc[group].bg_block_bitmap -
 			fs->group_desc[group-1].bg_block_bitmap -
 			fs->super->s_blocks_per_group;
 		i_stride = fs->group_desc[group].bg_inode_bitmap -
 			fs->group_desc[group-1].bg_inode_bitmap -
 			fs->super->s_blocks_per_group;
 		if (b_stride != i_stride ||
 		    b_stride < 0)
 			goto next;

 		/* printf("group %d has stride %d\n", group, b_stride); */
 		sum += b_stride;
 		num++;

 	next:
 		prev_has_sb = has_sb;
 	}

 	if (fs->group_desc_count > 12 && num < 3)
 		sum = 0;

 	if (num)
 		fs->stride = sum / num;
 	else
 		fs->stride = 0;

 	fs->super->s_raid_stride = fs->stride;
 	ext2fs_mark_super_dirty(fs);

 #if 0
 	if (fs->stride)
 		printf("Using RAID stride of %d\n", fs->stride);
 #endif
 }

 int main (int argc, char ** argv)
 {
 	errcode_t	retval;
 	ext2_filsys	fs;
 	int		c;
 	int		flags = 0;
 	int		flush = 0;
 	int		force = 0;
 	int		io_flags = 0;
 	int		force_min_size = 0;
 	int		print_min_size = 0;
 	int		fd, ret;
 	blk_t		new_size = 0;
 	blk_t		max_size = 0;
 	blk_t		min_size = 0;
 	io_manager	io_ptr;
 	char		*new_size_str = 0;
 	int		use_stride = -1;
 #ifdef HAVE_FSTAT64
 	struct stat64	st_buf;
 #else
 	struct stat	st_buf;
 #endif
 	__s64		new_file_size;
 	unsigned int	sys_page_size = 4096;
 	long		sysval;
 	int		len, mount_flags;
 	char		*mtpt;

 #ifdef ENABLE_NLS
 	setlocale(LC_MESSAGES, "");
 	setlocale(LC_CTYPE, "");
 	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 	textdomain(NLS_CAT_NAME);
 #endif

 	add_error_table(&et_ext2_error_table);

 	fprintf (stderr, "resize2fs %s (%s)\n",
 		 E2FSPROGS_VERSION, E2FSPROGS_DATE);
 	if (argc && *argv)
 		program_name = *argv;

 	while ((c = getopt (argc, argv, "d:fFhMPpS:")) != EOF) {
 		switch (c) {
 		case 'h':
 			usage(program_name);
 			break;
 		case 'f':
 			force = 1;
 			break;
 		case 'F':
 			flush = 1;
 			break;
 		case 'M':
 			force_min_size = 1;
 			break;
 		case 'P':
 			print_min_size = 1;
 			break;
 		case 'd':
 			flags |= atoi(optarg);
 			break;
 		case 'p':
 			flags |= RESIZE_PERCENT_COMPLETE;
 			break;
 		case 'S':
 			use_stride = atoi(optarg);
 			break;
 		default:
 			usage(program_name);
 		}
 	}
 	if (optind == argc)
 		usage(program_name);

 	device_name = argv[optind++];
 	if (optind < argc)
 		new_size_str = argv[optind++];
 	if (optind < argc)
 		usage(program_name);

 	io_options = strchr(device_name, '?');
 	if (io_options)
 		*io_options++ = 0;

 	/*
 	 * Figure out whether or not the device is mounted, and if it is
 	 * where it is mounted.
 	 */
 	len=80;
 	while (1) {
 		mtpt = malloc(len);
 		if (!mtpt)
 			return ENOMEM;
 		mtpt[len-1] = 0;
 		retval = ext2fs_check_mount_point(device_name, &mount_flags,
 						  mtpt, len);
 		if (retval) {
 			com_err("ext2fs_check_mount_point", retval,
 				_("while determining whether %s is mounted."),
 				device_name);
 			exit(1);
 		}
 		if (!(mount_flags & EXT2_MF_MOUNTED) || (mtpt[len-1] == 0))
 			break;
 		free(mtpt);
 		len = 2 * len;
 	}

 #ifdef HAVE_OPEN64
 	fd = open64(device_name, O_RDWR);
 #else
 	fd = open(device_name, O_RDWR);
 #endif
 	if (fd < 0) {
 		com_err("open", errno, _("while opening %s"),
 			device_name);
 		exit(1);
 	}

 #ifdef HAVE_FSTAT64
 	ret = fstat64(fd, &st_buf);
 #else
 	ret = fstat(fd, &st_buf);
 #endif
 	if (ret < 0) {
 		com_err("open", errno,
 			_("while getting stat information for %s"),
 			device_name);
 		exit(1);
 	}

 	if (flush) {
 		retval = ext2fs_sync_device(fd, 1);
 		if (retval) {
 			com_err(argv[0], retval,
 				_("while trying to flush %s"),
 				device_name);
 			exit(1);
 		}
 	}

 	if (!S_ISREG(st_buf.st_mode )) {
 		close(fd);
 		fd = -1;
 	}

 #ifdef CONFIG_TESTIO_DEBUG
 	if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
 		io_ptr = test_io_manager;
 		test_io_backing_manager = unix_io_manager;
 	} else
 #endif
 		io_ptr = unix_io_manager;

 	if (!(mount_flags & EXT2_MF_MOUNTED))
 		io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
 	retval = ext2fs_open2(device_name, io_options, io_flags,
 			      0, 0, io_ptr, &fs);
 	if (retval) {
 		com_err (program_name, retval, _("while trying to open %s"),
 			 device_name);
 		printf (_("Couldn't find valid filesystem superblock.\n"));
 		exit (1);
 	}

 	/*
 	 * Check for compatibility with the feature sets.  We need to
 	 * be more stringent than ext2fs_open().
 	 */
 	if (fs->super->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) {
 		com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
 			"(%s)", device_name);
 		exit(1);
 	}

 	/*
 	 * XXXX   The combination of flex_bg and !resize_inode causes
 	 * major problems for resize2fs, since when the group descriptors
 	 * grow in size this can potentially require multiple inode
 	 * tables to be moved aside to make room, and resize2fs chokes
 	 * rather badly in this scenario.  It's a rare combination,
 	 * except when a filesystem is expanded more than a certain
 	 * size, so for now, we'll just prohibit that combination.
 	 * This is something we should fix eventually, though.
 	 */
 	if ((fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
 	    !(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
 		com_err(program_name, 0, _("%s: The combination of flex_bg "
 					   "and\n\t!resize_inode features "
 					   "is not supported by resize2fs.\n"),
 			device_name);
 		exit(1);
 	}

 	min_size = calculate_minimum_resize_size(fs);

 	if (print_min_size) {
 		printf(_("Estimated minimum size of the filesystem: %u\n"),
 		       min_size);
 		exit(0);
 	}

 	/* Determine the system page size if possible */
 #ifdef HAVE_SYSCONF
 #if (!defined(_SC_PAGESIZE) && defined(_SC_PAGE_SIZE))
 #define _SC_PAGESIZE _SC_PAGE_SIZE
 #endif
 #ifdef _SC_PAGESIZE
 	sysval = sysconf(_SC_PAGESIZE);
 	if (sysval > 0)
 		sys_page_size = sysval;
 #endif /* _SC_PAGESIZE */
 #endif /* HAVE_SYSCONF */

 	/*
 	 * Get the size of the containing partition, and use this for
 	 * defaults and for making sure the new filesystem doesn't
 	 * exceed the partition size.
 	 */
 	retval = ext2fs_get_device_size(device_name, fs->blocksize,
 					&max_size);
 	if (retval) {
 		com_err(program_name, retval,
 			_("while trying to determine filesystem size"));
 		exit(1);
 	}
 	if (force_min_size)
 		new_size = min_size;
 	else if (new_size_str) {
 		new_size = parse_num_blocks(new_size_str,
 					    fs->super->s_log_block_size);
 		if (new_size == 0) {
 			com_err(program_name, 0,
 				_("Invalid new size: %s\n"), new_size_str);
 			exit(1);
 		}
 	} else {
 		new_size = max_size;
 		/* Round down to an even multiple of a pagesize */
 		if (sys_page_size > fs->blocksize)
 			new_size &= ~((sys_page_size / fs->blocksize)-1);
 	}

 	if (!force && new_size < min_size) {
 		com_err(program_name, 0,
 			_("New size smaller than minimum (%u)\n"), min_size);
 		exit(1);
 	}
 	if (use_stride >= 0) {
 		if (use_stride >= (int) fs->super->s_blocks_per_group) {
 			com_err(program_name, 0,
 				_("Invalid stride length"));
 			exit(1);
 		}
 		fs->stride = fs->super->s_raid_stride = use_stride;
 		ext2fs_mark_super_dirty(fs);
 	} else
 		  determine_fs_stride(fs);

 	/*
 	 * If we are resizing a plain file, and it's not big enough,
 	 * automatically extend it in a sparse fashion by writing the
 	 * last requested block.
 	 */
 	new_file_size = ((__u64) new_size) * fs->blocksize;
 	if ((__u64) new_file_size >
 	    (((__u64) 1) << (sizeof(st_buf.st_size)*8 - 1)) - 1)
 		fd = -1;
 	if ((new_file_size > st_buf.st_size) &&
 	    (fd > 0)) {
 		if ((ext2fs_llseek(fd, new_file_size-1, SEEK_SET) >= 0) &&
 		    (write(fd, "0", 1) == 1))
 			max_size = new_size;
 	}
 	if (!force && (new_size > max_size)) {
 		fprintf(stderr, _("The containing partition (or device)"
 			" is only %u (%dk) blocks.\nYou requested a new size"
 			" of %u blocks.\n\n"), max_size,
 			fs->blocksize / 1024, new_size);
 		exit(1);
 	}
 	if (new_size == fs->super->s_blocks_count) {
 		fprintf(stderr, _("The filesystem is already %u blocks "
 			"long.  Nothing to do!\n\n"), new_size);
 		exit(0);
 	}
 	if (mount_flags & EXT2_MF_MOUNTED) {
 		retval = online_resize_fs(fs, mtpt, &new_size, flags);
 	} else {
 		if (!force && ((fs->super->s_lastcheck < fs->super->s_mtime) ||
 			       (fs->super->s_state & EXT2_ERROR_FS) ||
 			       ((fs->super->s_state & EXT2_VALID_FS) == 0))) {
 			fprintf(stderr,
 				_("Please run 'e2fsck -f %s' first.\n\n"),
 				device_name);
 			exit(1);
 		}
 		printf(_("Resizing the filesystem on "
 			 "%s to %u (%dk) blocks.\n"),
 		       device_name, new_size, fs->blocksize / 1024);
 		retval = resize_fs(fs, &new_size, flags,
 				   ((flags & RESIZE_PERCENT_COMPLETE) ?
 				    resize_progress_func : 0));
 	}
 	free(mtpt);
 	if (retval) {
 		com_err(program_name, retval, _("while trying to resize %s"),
 			device_name);
 		fprintf(stderr,
 			_("Please run 'e2fsck -fy %s' to fix the filesystem\n"
 			  "after the aborted resize operation.\n"),
 			device_name);
 		ext2fs_close(fs);
 		exit(1);
 	}
 	printf(_("The filesystem on %s is now %u blocks long.\n\n"),
 	       device_name, new_size);

 	if ((st_buf.st_size > new_file_size) &&
 	    (fd > 0)) {
 #ifdef HAVE_FTRUNCATE64
 		retval = ftruncate64(fd, new_file_size);
 #else
 		retval = 0;
 		/* Only truncate if new_file_size doesn't overflow off_t */
 		if (((off_t) new_file_size) == new_file_size)
 			retval = ftruncate(fd, (off_t) new_file_size);
 #endif
 		if (retval)
 			com_err(program_name, retval,
 				_("while trying to truncate %s"),
 				device_name);
 	}
 	if (fd > 0)
 		close(fd);
 	remove_error_table(&et_ext2_error_table);
 	return (0);
 }
	/*
	* main.c --- ext2 resizer main program
	*
	* Copyright (C) 1997, 1998 by Theodore Ts'o and
	* PowerQuest, Inc.
	*
	* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o
	*
	* %Begin-Header%
	* This file may be redistributed under the terms of the GNU Public
	* License.
	* %End-Header%
	*/

	#define _LARGEFILE_SOURCE
	#define _LARGEFILE64_SOURCE

	#ifdef HAVE_GETOPT_H
	#include <getopt.h>
	#else
	extern char *optarg;
	extern int optind;
	#endif
	#include <unistd.h>
	#ifdef HAVE_STDLIB_H
	#include <stdlib.h>
	#endif
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>

	#include "e2p/e2p.h"

	#include "resize2fs.h"

	#include "../version.h"

	char program_name, device_name, *io_options;

	static void usage (char *prog)
	{
	fprintf (stderr, _("Usage: %s [-d debug_flags] [-f] [-F] [-M] [-P] "
	"[-p] device [new_size]\n\n"), prog);

	exit (1);
	}

	static errcode_t resize_progress_func(ext2_resize_t rfs, int pass,
	unsigned long cur, unsigned long max)
	{
	ext2_sim_progmeter progress;
	const char *label;
	errcode_t retval;

	progress = (ext2_sim_progmeter) rfs->prog_data;
	if (max == 0)
	return 0;
	if (cur == 0) {
	if (progress)
	ext2fs_progress_close(progress);
	progress = 0;
	switch (pass) {
	case E2_RSZ_EXTEND_ITABLE_PASS:
	label = _("Extending the inode table");
	break;
	case E2_RSZ_BLOCK_RELOC_PASS:
	label = _("Relocating blocks");
	break;
	case E2_RSZ_INODE_SCAN_PASS:
	label = _("Scanning inode table");
	break;
	case E2_RSZ_INODE_REF_UPD_PASS:
	label = _("Updating inode references");
	break;
	case E2_RSZ_MOVE_ITABLE_PASS:
	label = _("Moving inode table");
	break;
	default:
	label = _("Unknown pass?!?");
	break;
	}
	printf(_("Begin pass %d (max = %lu)\n"), pass, max);
	retval = ext2fs_progress_init(&progress, label, 30,
	40, max, 0);
	if (retval)
	progress = 0;
	rfs->prog_data = (void *) progress;
	}
	if (progress)
	ext2fs_progress_update(progress, cur);
	if (cur >= max) {
	if (progress)
	ext2fs_progress_close(progress);
	progress = 0;
	rfs->prog_data = 0;
	}
	return 0;
	}

	static void determine_fs_stride(ext2_filsys fs)
	{
	unsigned int group;
	unsigned long long sum;
	unsigned int has_sb, prev_has_sb, num;
	int i_stride, b_stride;

	if (fs->stride)
	return;
	num = 0; sum = 0;
	for (group = 0; group < fs->group_desc_count; group++) {
	has_sb = ext2fs_bg_has_super(fs, group);
	if (group == 0 \|\| has_sb != prev_has_sb)
	goto next;
	b_stride = fs->group_desc[group].bg_block_bitmap -
	fs->group_desc[group-1].bg_block_bitmap -
	fs->super->s_blocks_per_group;
	i_stride = fs->group_desc[group].bg_inode_bitmap -
	fs->group_desc[group-1].bg_inode_bitmap -
	fs->super->s_blocks_per_group;
	if (b_stride != i_stride \|\|
	b_stride < 0)
	goto next;

	/* printf("group %d has stride %d\n", group, b_stride); */
	sum += b_stride;
	num++;

	next:
	prev_has_sb = has_sb;
	}

	if (fs->group_desc_count > 12 && num < 3)
	sum = 0;

	if (num)
	fs->stride = sum / num;
	else
	fs->stride = 0;

	fs->super->s_raid_stride = fs->stride;
	ext2fs_mark_super_dirty(fs);

	#if 0
	if (fs->stride)
	printf("Using RAID stride of %d\n", fs->stride);
	#endif
	}

	int main (int argc, char ** argv)
	{
	errcode_t retval;
	ext2_filsys fs;
	int c;
	int flags = 0;
	int flush = 0;
	int force = 0;
	int io_flags = 0;
	int force_min_size = 0;
	int print_min_size = 0;
	int fd, ret;
	blk_t new_size = 0;
	blk_t max_size = 0;
	blk_t min_size = 0;
	io_manager io_ptr;
	char *new_size_str = 0;
	int use_stride = -1;
	#ifdef HAVE_FSTAT64
	struct stat64 st_buf;
	#else
	struct stat st_buf;
	#endif
	__s64 new_file_size;
	unsigned int sys_page_size = 4096;
	long sysval;
	int len, mount_flags;
	char *mtpt;

	#ifdef ENABLE_NLS
	setlocale(LC_MESSAGES, "");
	setlocale(LC_CTYPE, "");
	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
	textdomain(NLS_CAT_NAME);
	#endif

	add_error_table(&et_ext2_error_table);

	fprintf (stderr, "resize2fs %s (%s)\n",
	E2FSPROGS_VERSION, E2FSPROGS_DATE);
	if (argc && *argv)
	program_name = *argv;

	while ((c = getopt (argc, argv, "d:fFhMPpS:")) != EOF) {
	switch (c) {
	case 'h':
	usage(program_name);
	break;
	case 'f':
	force = 1;
	break;
	case 'F':
	flush = 1;
	break;
	case 'M':
	force_min_size = 1;
	break;
	case 'P':
	print_min_size = 1;
	break;
	case 'd':
	flags \|= atoi(optarg);
	break;
	case 'p':
	flags \|= RESIZE_PERCENT_COMPLETE;
	break;
	case 'S':
	use_stride = atoi(optarg);
	break;
	default:
	usage(program_name);
	}
	}
	if (optind == argc)
	usage(program_name);

	device_name = argv[optind++];
	if (optind < argc)
	new_size_str = argv[optind++];
	if (optind < argc)
	usage(program_name);

	io_options = strchr(device_name, '?');
	if (io_options)
	*io_options++ = 0;

	/*
	* Figure out whether or not the device is mounted, and if it is
	* where it is mounted.
	*/
	len=80;
	while (1) {
	mtpt = malloc(len);
	if (!mtpt)
	return ENOMEM;
	mtpt[len-1] = 0;
	retval = ext2fs_check_mount_point(device_name, &mount_flags,
	mtpt, len);
	if (retval) {
	com_err("ext2fs_check_mount_point", retval,
	_("while determining whether %s is mounted."),
	device_name);
	exit(1);
	}
	if (!(mount_flags & EXT2_MF_MOUNTED) \|\| (mtpt[len-1] == 0))
	break;
	free(mtpt);
	len = 2 * len;
	}

	#ifdef HAVE_OPEN64
	fd = open64(device_name, O_RDWR);
	#else
	fd = open(device_name, O_RDWR);
	#endif
	if (fd < 0) {
	com_err("open", errno, _("while opening %s"),
	device_name);
	exit(1);
	}

	#ifdef HAVE_FSTAT64
	ret = fstat64(fd, &st_buf);
	#else
	ret = fstat(fd, &st_buf);
	#endif
	if (ret < 0) {
	com_err("open", errno,
	_("while getting stat information for %s"),
	device_name);
	exit(1);
	}

	if (flush) {
	retval = ext2fs_sync_device(fd, 1);
	if (retval) {
	com_err(argv[0], retval,
	_("while trying to flush %s"),
	device_name);
	exit(1);
	}
	}

	if (!S_ISREG(st_buf.st_mode )) {
	close(fd);
	fd = -1;
	}

	#ifdef CONFIG_TESTIO_DEBUG
	if (getenv("TEST_IO_FLAGS") \|\| getenv("TEST_IO_BLOCK")) {
	io_ptr = test_io_manager;
	test_io_backing_manager = unix_io_manager;
	} else
	#endif
	io_ptr = unix_io_manager;

	if (!(mount_flags & EXT2_MF_MOUNTED))
	io_flags = EXT2_FLAG_RW \| EXT2_FLAG_EXCLUSIVE;
	retval = ext2fs_open2(device_name, io_options, io_flags,
	0, 0, io_ptr, &fs);
	if (retval) {
	com_err (program_name, retval, _("while trying to open %s"),
	device_name);
	printf (_("Couldn't find valid filesystem superblock.\n"));
	exit (1);
	}

	/*
	* Check for compatibility with the feature sets. We need to
	* be more stringent than ext2fs_open().
	*/
	if (fs->super->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) {
	com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
	"(%s)", device_name);
	exit(1);
	}

	/*
	* XXXX The combination of flex_bg and !resize_inode causes
	* major problems for resize2fs, since when the group descriptors
	* grow in size this can potentially require multiple inode
	* tables to be moved aside to make room, and resize2fs chokes
	* rather badly in this scenario. It's a rare combination,
	* except when a filesystem is expanded more than a certain
	* size, so for now, we'll just prohibit that combination.
	* This is something we should fix eventually, though.
	*/
	if ((fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
	!(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
	com_err(program_name, 0, _("%s: The combination of flex_bg "
	"and\n\t!resize_inode features "
	"is not supported by resize2fs.\n"),
	device_name);
	exit(1);
	}

	min_size = calculate_minimum_resize_size(fs);

	if (print_min_size) {
	printf(_("Estimated minimum size of the filesystem: %u\n"),
	min_size);
	exit(0);
	}

	/* Determine the system page size if possible */
	#ifdef HAVE_SYSCONF
	#if (!defined(_SC_PAGESIZE) && defined(_SC_PAGE_SIZE))
	#define _SC_PAGESIZE _SC_PAGE_SIZE
	#endif
	#ifdef _SC_PAGESIZE
	sysval = sysconf(_SC_PAGESIZE);
	if (sysval > 0)
	sys_page_size = sysval;
	#endif /* _SC_PAGESIZE */
	#endif /* HAVE_SYSCONF */

	/*
	* Get the size of the containing partition, and use this for
	* defaults and for making sure the new filesystem doesn't
	* exceed the partition size.
	*/
	retval = ext2fs_get_device_size(device_name, fs->blocksize,
	&max_size);
	if (retval) {
	com_err(program_name, retval,
	_("while trying to determine filesystem size"));
	exit(1);
	}
	if (force_min_size)
	new_size = min_size;
	else if (new_size_str) {
	new_size = parse_num_blocks(new_size_str,
	fs->super->s_log_block_size);
	if (new_size == 0) {
	com_err(program_name, 0,
	_("Invalid new size: %s\n"), new_size_str);
	exit(1);
	}
	} else {
	new_size = max_size;
	/* Round down to an even multiple of a pagesize */
	if (sys_page_size > fs->blocksize)
	new_size &= ~((sys_page_size / fs->blocksize)-1);
	}

	if (!force && new_size < min_size) {
	com_err(program_name, 0,
	_("New size smaller than minimum (%u)\n"), min_size);
	exit(1);
	}
	if (use_stride >= 0) {
	if (use_stride >= (int) fs->super->s_blocks_per_group) {
	com_err(program_name, 0,
	_("Invalid stride length"));
	exit(1);
	}
	fs->stride = fs->super->s_raid_stride = use_stride;
	ext2fs_mark_super_dirty(fs);
	} else
	determine_fs_stride(fs);

	/*
	* If we are resizing a plain file, and it's not big enough,
	* automatically extend it in a sparse fashion by writing the
	* last requested block.
	*/
	new_file_size = ((__u64) new_size) * fs->blocksize;
	if ((__u64) new_file_size >
	(((__u64) 1) << (sizeof(st_buf.st_size)*8 - 1)) - 1)
	fd = -1;
	if ((new_file_size > st_buf.st_size) &&
	(fd > 0)) {
	if ((ext2fs_llseek(fd, new_file_size-1, SEEK_SET) >= 0) &&
	(write(fd, "0", 1) == 1))
	max_size = new_size;
	}
	if (!force && (new_size > max_size)) {
	fprintf(stderr, _("The containing partition (or device)"
	" is only %u (%dk) blocks.\nYou requested a new size"
	" of %u blocks.\n\n"), max_size,
	fs->blocksize / 1024, new_size);
	exit(1);
	}
	if (new_size == fs->super->s_blocks_count) {
	fprintf(stderr, _("The filesystem is already %u blocks "
	"long. Nothing to do!\n\n"), new_size);
	exit(0);
	}
	if (mount_flags & EXT2_MF_MOUNTED) {
	retval = online_resize_fs(fs, mtpt, &new_size, flags);
	} else {
	if (!force && ((fs->super->s_lastcheck < fs->super->s_mtime) \|\|
	(fs->super->s_state & EXT2_ERROR_FS) \|\|
	((fs->super->s_state & EXT2_VALID_FS) == 0))) {
	fprintf(stderr,
	_("Please run 'e2fsck -f %s' first.\n\n"),
	device_name);
	exit(1);
	}
	printf(_("Resizing the filesystem on "
	"%s to %u (%dk) blocks.\n"),
	device_name, new_size, fs->blocksize / 1024);
	retval = resize_fs(fs, &new_size, flags,
	((flags & RESIZE_PERCENT_COMPLETE) ?
	resize_progress_func : 0));
	}
	free(mtpt);
	if (retval) {
	com_err(program_name, retval, _("while trying to resize %s"),
	device_name);
	fprintf(stderr,
	_("Please run 'e2fsck -fy %s' to fix the filesystem\n"
	"after the aborted resize operation.\n"),
	device_name);
	ext2fs_close(fs);
	exit(1);
	}
	printf(_("The filesystem on %s is now %u blocks long.\n\n"),
	device_name, new_size);

	if ((st_buf.st_size > new_file_size) &&
	(fd > 0)) {
	#ifdef HAVE_FTRUNCATE64
	retval = ftruncate64(fd, new_file_size);
	#else
	retval = 0;
	/* Only truncate if new_file_size doesn't overflow off_t */
	if (((off_t) new_file_size) == new_file_size)
	retval = ftruncate(fd, (off_t) new_file_size);
	#endif
	if (retval)
	com_err(program_name, retval,
	_("while trying to truncate %s"),
	device_name);
	}
	if (fd > 0)
	close(fd);
	remove_error_table(&et_ext2_error_table);
	return (0);
	}