2 * online.c --- Do on-line resizing of the ext3 filesystem
4 * Copyright (C) 2006 by Theodore Ts'o
7 * This file may be redistributed under the terms of the GNU Public
12 #include "resize2fs.h"
13 #ifdef HAVE_SYS_IOCTL_H
14 #include <sys/ioctl.h>
19 extern char *program_name;
21 errcode_t online_resize_fs(ext2_filsys fs, const char *mtpt,
22 blk_t *new_size, int flags)
24 struct ext2_new_group_input input;
25 struct ext2_super_block *sb = fs->super;
30 int fd, r_frac, overhead, new_desc_blocks;
32 printf(_("Filesystem at %s is mounted on %s; "
33 "on-line resizing required\n"), fs->device_name, mtpt);
35 if (*new_size < sb->s_blocks_count) {
36 printf(_("On-line shrinking from %u to %u not supported.\n"),
37 sb->s_blocks_count, *new_size);
42 * If the number of descriptor blocks is going to increase,
43 * the on-line resizing inode must be present.
45 new_desc_blocks = ext2fs_div_ceil(
46 ext2fs_div_ceil(*new_size -
47 fs->super->s_first_data_block,
48 EXT2_BLOCKS_PER_GROUP(fs->super)),
49 EXT2_DESC_PER_BLOCK(fs->super));
50 printf("old desc_blocks = %d, new_desc_blocks = %d\n", fs->desc_blocks,
52 if (!(fs->super->s_feature_compat &
53 EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
54 new_desc_blocks != fs->desc_blocks) {
55 com_err(program_name, 0,
56 _("Filesystem does not support online resizing"));
60 fd = open(mtpt, O_RDONLY);
62 com_err(program_name, errno,
63 _("while trying to open mountpoint %s"), mtpt);
67 size=sb->s_blocks_count;
68 if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
70 com_err(program_name, 0,
71 _("Permission denied to resize filesystem"));
72 else if (errno == ENOTTY)
73 com_err(program_name, 0,
74 _("Kernel does not support online resizing"));
76 com_err(program_name, errno,
77 _("While checking for on-line resizing support"));
81 r_frac = ext2fs_div_ceil(100 * sb->s_r_blocks_count, sb->s_blocks_count);
83 retval = ext2fs_read_bitmaps(fs);
87 retval = ext2fs_dup_handle(fs, &new_fs);
91 retval = adjust_fs_info(new_fs, fs, *new_size);
95 printf(_("Performing an on-line resize of %s to %u (%dk) blocks.\n"),
96 fs->device_name, *new_size, fs->blocksize / 1024);
98 size = fs->group_desc_count * sb->s_blocks_per_group +
99 sb->s_first_data_block;
100 if (size > *new_size)
103 if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
104 com_err(program_name, errno,
105 _("While trying to extend the last group"));
109 for (i = fs->group_desc_count;
110 i < new_fs->group_desc_count; i++) {
112 overhead = (int) (2 + new_fs->inode_blocks_per_group);
114 if (ext2fs_bg_has_super(new_fs, new_fs->group_desc_count - 1))
115 overhead += 1 + new_fs->desc_blocks +
116 new_fs->super->s_reserved_gdt_blocks;
119 input.block_bitmap = new_fs->group_desc[i].bg_block_bitmap;
120 input.inode_bitmap = new_fs->group_desc[i].bg_inode_bitmap;
121 input.inode_table = new_fs->group_desc[i].bg_inode_table;
122 input.blocks_count = sb->s_blocks_per_group;
123 if (i == new_fs->group_desc_count-1) {
124 input.blocks_count = new_fs->super->s_blocks_count -
125 sb->s_first_data_block -
126 (i * sb->s_blocks_per_group);
128 input.reserved_blocks = e2p_percent(r_frac,
132 printf("new block bitmap is at 0x%04x\n", input.block_bitmap);
133 printf("new inode bitmap is at 0x%04x\n", input.inode_bitmap);
134 printf("new inode table is at 0x%04x-0x%04x\n",
136 input.inode_table + new_fs->inode_blocks_per_group-1);
137 printf("new group has %u blocks\n", input.blocks_count);
138 printf("new group will reserve %d blocks\n",
139 input.reserved_blocks);
140 printf("new group has %d free blocks\n",
141 new_fs->group_desc[i].bg_free_blocks_count);
142 printf("new group has %d free inodes (%d blocks)\n",
143 new_fs->group_desc[i].bg_free_inodes_count,
144 new_fs->inode_blocks_per_group);
145 printf("Adding group #%d\n", input.group);
148 if (ioctl(fd, EXT2_IOC_GROUP_ADD, &input) < 0) {
149 com_err(program_name, errno,
150 _("While trying to add group #%d"),