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/*
* 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)
{
struct ext2_new_group_input input;
struct ext2_super_block *sb = fs->super;
ext2_filsys new_fs;
errcode_t retval;
dgrp_t i;
blk_t size;
int fd, r_frac, overhead;
printf(_("Filesystem at %s is mounted on %s; "
"on-line resizing required\n"), fs->device_name, mtpt);
if (*new_size < sb->s_blocks_count) {
printf(_("On-line shrinking from %u to %u not supported.\n"),
sb->s_blocks_count, *new_size);
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,
_("Filesystem does not support online resizing"));
else
com_err(program_name, errno,
_("While checking for on-line resizing support"));
exit(1);
}
r_frac = ((100 * sb->s_r_blocks_count) + sb->s_blocks_count-1) /
sb->s_blocks_count;
retval = ext2fs_read_bitmaps(fs);
if (retval)
return retval;
retval = ext2fs_dup_handle(fs, &new_fs);
if (retval)
return retval;
retval = adjust_fs_info(new_fs, fs, *new_size);
if (retval)
return retval;
printf(_("Performing an on-line resize of %s to %d (%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 = e2p_percent(r_frac,
input.blocks_count);
#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 %d 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 (ioctl(fd, EXT2_IOC_GROUP_ADD, &input) < 0) {
com_err(program_name, errno,
_("While trying to add group #%d"),
input.group);
exit(1);
}
}
ext2fs_free(new_fs);
close(fd);
return 0;
}
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