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 blk64_t *new_size, int flags EXT2FS_ATTR((unused)))
25 struct ext2_new_group_input input;
26 struct ext4_new_group_input input64;
27 struct ext2_super_block *sb = fs->super;
28 unsigned long new_desc_blocks;
35 int use_old_ioctl = 1;
37 printf(_("Filesystem at %s is mounted on %s; "
38 "on-line resizing required\n"), fs->device_name, mtpt);
40 if (*new_size < ext2fs_blocks_count(sb)) {
41 com_err(program_name, 0, _("On-line shrinking not supported"));
46 * If the number of descriptor blocks is going to increase,
47 * the on-line resizing inode must be present.
49 new_desc_blocks = ext2fs_div_ceil(
50 ext2fs_div64_ceil(*new_size -
51 fs->super->s_first_data_block,
52 EXT2_BLOCKS_PER_GROUP(fs->super)),
53 EXT2_DESC_PER_BLOCK(fs->super));
54 printf("old_desc_blocks = %lu, new_desc_blocks = %lu\n",
55 fs->desc_blocks, new_desc_blocks);
56 if (!(fs->super->s_feature_compat &
57 EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
58 new_desc_blocks != fs->desc_blocks) {
59 com_err(program_name, 0,
60 _("Filesystem does not support online resizing"));
64 fd = open(mtpt, O_RDONLY);
66 com_err(program_name, errno,
67 _("while trying to open mountpoint %s"), mtpt);
71 size=ext2fs_blocks_count(sb);
73 if (ioctl(fd, EXT4_IOC_RESIZE_FS, new_size)) {
74 if (errno != ENOTTY) {
76 com_err(program_name, 0,
77 _("Permission denied to resize filesystem"));
79 com_err(program_name, errno,
80 _("While checking for on-line resizing "
89 if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
91 com_err(program_name, 0,
92 _("Permission denied to resize filesystem"));
93 else if (errno == ENOTTY)
94 com_err(program_name, 0,
95 _("Kernel does not support online resizing"));
97 com_err(program_name, errno,
98 _("While checking for on-line resizing support"));
102 percent = (ext2fs_r_blocks_count(sb) * 100.0) /
103 ext2fs_blocks_count(sb);
105 retval = ext2fs_read_bitmaps(fs);
109 retval = ext2fs_dup_handle(fs, &new_fs);
113 /* The current method of adding one block group at a time to a
114 * mounted filesystem means it is impossible to accomodate the
115 * flex_bg allocation method of placing the metadata together
116 * in a single block group. For now we "fix" this issue by
117 * using the traditional layout for new block groups, where
118 * each block group is self-contained and contains its own
119 * bitmap blocks and inode tables. This means we don't get
120 * the layout advantages of flex_bg in the new block groups,
121 * but at least it allows on-line resizing to function.
123 new_fs->super->s_feature_incompat &= ~EXT4_FEATURE_INCOMPAT_FLEX_BG;
124 retval = adjust_fs_info(new_fs, fs, 0, *new_size);
128 printf(_("Performing an on-line resize of %s to %llu (%dk) blocks.\n"),
129 fs->device_name, *new_size, fs->blocksize / 1024);
131 size = fs->group_desc_count * sb->s_blocks_per_group +
132 sb->s_first_data_block;
133 if (size > *new_size)
136 if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
137 com_err(program_name, errno,
138 _("While trying to extend the last group"));
142 for (i = fs->group_desc_count;
143 i < new_fs->group_desc_count; i++) {
145 overhead = (int) (2 + new_fs->inode_blocks_per_group);
147 if (ext2fs_bg_has_super(new_fs, new_fs->group_desc_count - 1))
148 overhead += 1 + new_fs->desc_blocks +
149 new_fs->super->s_reserved_gdt_blocks;
152 input.block_bitmap = ext2fs_block_bitmap_loc(new_fs, i);
153 input.inode_bitmap = ext2fs_inode_bitmap_loc(new_fs, i);
154 input.inode_table = ext2fs_inode_table_loc(new_fs, i);
155 input.blocks_count = ext2fs_group_blocks_count(new_fs, i);
156 input.reserved_blocks = (blk_t) (percent * input.blocks_count
160 printf("new block bitmap is at 0x%04x\n", input.block_bitmap);
161 printf("new inode bitmap is at 0x%04x\n", input.inode_bitmap);
162 printf("new inode table is at 0x%04x-0x%04x\n",
164 input.inode_table + new_fs->inode_blocks_per_group-1);
165 printf("new group has %u blocks\n", input.blocks_count);
166 printf("new group will reserve %d blocks\n",
167 input.reserved_blocks);
168 printf("new group has %d free blocks\n",
169 ext2fs_bg_free_blocks_count(new_fs, i),
170 printf("new group has %d free inodes (%d blocks)\n",
171 ext2fs_bg_free_inodes_count(new_fs, i),
172 new_fs->inode_blocks_per_group);
173 printf("Adding group #%d\n", input.group);
177 ioctl(fd, EXT2_IOC_GROUP_ADD, &input) == 0)
182 input64.group = input.group;
183 input64.block_bitmap = input.block_bitmap;
184 input64.inode_bitmap = input.inode_bitmap;
185 input64.inode_table = input.inode_table;
186 input64.blocks_count = input.blocks_count;
187 input64.reserved_blocks = input.reserved_blocks;
188 input64.unused = input.unused;
190 if (ioctl(fd, EXT4_IOC_GROUP_ADD, &input64) < 0) {
191 com_err(program_name, errno,
192 _("While trying to add group #%d"),
203 printf(_("Filesystem at %s is mounted on %s, and on-line resizing is "
204 "not supported on this system.\n"), fs->device_name, mtpt);