resize/online.c

/*
 * online.c --- Do on-line resizing of the ext3 filesystem
 *
 * Copyright (C) 2006 by Theodore Ts'o
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include "resize2fs.h"
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#include <sys/stat.h>
#include <fcntl.h>

extern char *program_name;

errcode_t online_resize_fs(ext2_filsys fs, const char *mtpt,
			   blk_t *new_size, int flags EXT2FS_ATTR((unused)))
{
#ifdef __linux__
	struct ext2_new_group_input input;
	struct ext4_new_group_input input64;
	struct ext2_super_block *sb = fs->super;
	unsigned long		new_desc_blocks;
	ext2_filsys 		new_fs;
	errcode_t 		retval;
	double			percent;
	dgrp_t			i;
	blk_t			size;
	int			fd, overhead;
	int			use_old_ioctl = 1;

	printf(_("Filesystem at %s is mounted on %s; "
		 "on-line resizing required\n"), fs->device_name, mtpt);

	if (*new_size < sb->s_blocks_count) {
		com_err(program_name, 0, _("On-line shrinking not supported"));
		exit(1);
	}

	/*
	 * If the number of descriptor blocks is going to increase,
	 * the on-line resizing inode must be present.
	 */
	new_desc_blocks = ext2fs_div_ceil(
		ext2fs_div_ceil(*new_size -
				fs->super->s_first_data_block,
				EXT2_BLOCKS_PER_GROUP(fs->super)),
		EXT2_DESC_PER_BLOCK(fs->super));
	printf("old desc_blocks = %lu, new_desc_blocks = %lu\n",
	       fs->desc_blocks, new_desc_blocks);
	if (!(fs->super->s_feature_compat &
	      EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
	    new_desc_blocks != fs->desc_blocks) {
		com_err(program_name, 0,
			_("Filesystem does not support online resizing"));
		exit(1);
	}

	fd = open(mtpt, O_RDONLY);
	if (fd < 0) {
		com_err(program_name, errno,
			_("while trying to open mountpoint %s"), mtpt);
		exit(1);
	}

	size=sb->s_blocks_count;
	if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
		if (errno == EPERM)
			com_err(program_name, 0,
				_("Permission denied to resize filesystem"));
		else if (errno == ENOTTY)
			com_err(program_name, 0,
			_("Kernel does not support online resizing"));
		else
			com_err(program_name, errno,
			_("While checking for on-line resizing support"));
		exit(1);
	}

	percent = (sb->s_r_blocks_count * 100.0) / sb->s_blocks_count;

	retval = ext2fs_read_bitmaps(fs);
	if (retval)
		return retval;

	retval = ext2fs_dup_handle(fs, &new_fs);
	if (retval)
		return retval;

	/* The current method of adding one block group at a time to a
	 * mounted filesystem means it is impossible to accomodate the
	 * flex_bg allocation method of placing the metadata together
	 * in a single block group.  For now we "fix" this issue by
	 * using the traditional layout for new block groups, where
	 * each block group is self-contained and contains its own
	 * bitmap blocks and inode tables.  This means we don't get
	 * the layout advantages of flex_bg in the new block groups,
	 * but at least it allows on-line resizing to function.
	 */
	new_fs->super->s_feature_incompat &= ~EXT4_FEATURE_INCOMPAT_FLEX_BG;
	retval = adjust_fs_info(new_fs, fs, 0, *new_size);
	if (retval)
		return retval;

	printf(_("Performing an on-line resize of %s to %u (%dk) blocks.\n"),
	       fs->device_name, *new_size, fs->blocksize / 1024);

	size = fs->group_desc_count * sb->s_blocks_per_group +
		sb->s_first_data_block;
	if (size > *new_size)
		size = *new_size;

	if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
		com_err(program_name, errno,
			_("While trying to extend the last group"));
		exit(1);
	}

	for (i = fs->group_desc_count;
	     i < new_fs->group_desc_count; i++) {

		overhead = (int) (2 + new_fs->inode_blocks_per_group);

		if (ext2fs_bg_has_super(new_fs, new_fs->group_desc_count - 1))
			overhead += 1 + new_fs->desc_blocks +
				new_fs->super->s_reserved_gdt_blocks;

		input.group = i;
		input.block_bitmap = new_fs->group_desc[i].bg_block_bitmap;
		input.inode_bitmap = new_fs->group_desc[i].bg_inode_bitmap;
		input.inode_table = new_fs->group_desc[i].bg_inode_table;
		input.blocks_count = sb->s_blocks_per_group;
		if (i == new_fs->group_desc_count-1) {
			input.blocks_count = new_fs->super->s_blocks_count -
				sb->s_first_data_block -
				(i * sb->s_blocks_per_group);
		}
		input.reserved_blocks = (blk_t) (percent * input.blocks_count
						 / 100.0);

#if 0
		printf("new block bitmap is at 0x%04x\n", input.block_bitmap);
		printf("new inode bitmap is at 0x%04x\n", input.inode_bitmap);
		printf("new inode table is at 0x%04x-0x%04x\n",
		       input.inode_table,
		       input.inode_table + new_fs->inode_blocks_per_group-1);
		printf("new group has %u blocks\n", input.blocks_count);
		printf("new group will reserve %d blocks\n",
		       input.reserved_blocks);
		printf("new group has %d free blocks\n",
		       new_fs->group_desc[i].bg_free_blocks_count);
		printf("new group has %d free inodes (%d blocks)\n",
		       new_fs->group_desc[i].bg_free_inodes_count,
		       new_fs->inode_blocks_per_group);
		printf("Adding group #%d\n", input.group);
#endif

		if (use_old_ioctl &&
		    ioctl(fd, EXT2_IOC_GROUP_ADD, &input) == 0)
			continue;
		else
			use_old_ioctl = 0;

		input64.group = input.group;
		input64.block_bitmap = input.block_bitmap;
		input64.inode_bitmap = input.inode_bitmap;
		input64.inode_table = input.inode_table;
		input64.blocks_count = input.blocks_count;
		input64.reserved_blocks = input.reserved_blocks;
		input64.unused = input.unused;

		if (ioctl(fd, EXT4_IOC_GROUP_ADD, &input64) < 0) {
			com_err(program_name, errno,
				_("While trying to add group #%d"),
				input.group);
			exit(1);
		}
	}

	ext2fs_free(new_fs);
	close(fd);

	return 0;
#else
	printf(_("Filesystem at %s is mounted on %s, and on-line resizing is "
		 "not supported on this system.\n"), fs->device_name, mtpt);
	exit(1);
#endif
}