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
13 #include "resize2fs.h"
14 #ifdef HAVE_SYS_IOCTL_H
15 #include <sys/ioctl.h>
20 extern char *program_name;
22 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
24 errcode_t online_resize_fs(ext2_filsys fs, const char *mtpt,
25 blk64_t *new_size, int flags EXT2FS_ATTR((unused)))
28 struct ext2_new_group_input input;
29 struct ext4_new_group_input input64;
30 struct ext2_super_block *sb = fs->super;
31 unsigned long new_desc_blocks;
38 int use_old_ioctl = 1;
40 printf(_("Filesystem at %s is mounted on %s; "
41 "on-line resizing required\n"), fs->device_name, mtpt);
43 if (*new_size < ext2fs_blocks_count(sb)) {
44 com_err(program_name, 0, _("On-line shrinking not supported"));
49 * If the number of descriptor blocks is going to increase,
50 * the on-line resizing inode must be present.
52 new_desc_blocks = ext2fs_div_ceil(
53 ext2fs_div64_ceil(*new_size -
54 fs->super->s_first_data_block,
55 EXT2_BLOCKS_PER_GROUP(fs->super)),
56 EXT2_DESC_PER_BLOCK(fs->super));
57 printf("old_desc_blocks = %lu, new_desc_blocks = %lu\n",
58 fs->desc_blocks, new_desc_blocks);
59 if (!(fs->super->s_feature_compat &
60 EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
61 new_desc_blocks != fs->desc_blocks) {
62 com_err(program_name, 0,
63 _("Filesystem does not support online resizing"));
67 fd = open(mtpt, O_RDONLY);
69 com_err(program_name, errno,
70 _("while trying to open mountpoint %s"), mtpt);
74 if (ioctl(fd, EXT4_IOC_RESIZE_FS, new_size)) {
75 if (errno != EINVAL) {
77 com_err(program_name, 0,
78 _("Permission denied to resize filesystem"));
80 com_err(program_name, errno,
81 _("While checking for on-line resizing "
90 if ((ext2fs_blocks_count(sb) > MAX_32_NUM) ||
91 (*new_size > MAX_32_NUM)) {
92 com_err(program_name, 0,
93 _("Kernel does not support resizing a file system "
97 size = ext2fs_blocks_count(sb);
99 if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
101 com_err(program_name, 0,
102 _("Permission denied to resize filesystem"));
103 else if (errno == ENOTTY)
104 com_err(program_name, 0,
105 _("Kernel does not support online resizing"));
107 com_err(program_name, errno,
108 _("While checking for on-line resizing support"));
112 percent = (ext2fs_r_blocks_count(sb) * 100.0) /
113 ext2fs_blocks_count(sb);
115 retval = ext2fs_read_bitmaps(fs);
119 retval = ext2fs_dup_handle(fs, &new_fs);
123 /* The current method of adding one block group at a time to a
124 * mounted filesystem means it is impossible to accomodate the
125 * flex_bg allocation method of placing the metadata together
126 * in a single block group. For now we "fix" this issue by
127 * using the traditional layout for new block groups, where
128 * each block group is self-contained and contains its own
129 * bitmap blocks and inode tables. This means we don't get
130 * the layout advantages of flex_bg in the new block groups,
131 * but at least it allows on-line resizing to function.
133 new_fs->super->s_feature_incompat &= ~EXT4_FEATURE_INCOMPAT_FLEX_BG;
134 retval = adjust_fs_info(new_fs, fs, 0, *new_size);
138 printf(_("Performing an on-line resize of %s to %llu (%dk) blocks.\n"),
139 fs->device_name, *new_size, fs->blocksize / 1024);
141 size = fs->group_desc_count * sb->s_blocks_per_group +
142 sb->s_first_data_block;
143 if (size > *new_size)
146 if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
147 com_err(program_name, errno,
148 _("While trying to extend the last group"));
152 for (i = fs->group_desc_count;
153 i < new_fs->group_desc_count; i++) {
155 overhead = (int) (2 + new_fs->inode_blocks_per_group);
157 if (ext2fs_bg_has_super(new_fs, new_fs->group_desc_count - 1))
158 overhead += 1 + new_fs->desc_blocks +
159 new_fs->super->s_reserved_gdt_blocks;
162 input.block_bitmap = ext2fs_block_bitmap_loc(new_fs, i);
163 input.inode_bitmap = ext2fs_inode_bitmap_loc(new_fs, i);
164 input.inode_table = ext2fs_inode_table_loc(new_fs, i);
165 input.blocks_count = ext2fs_group_blocks_count(new_fs, i);
166 input.reserved_blocks = (blk_t) (percent * input.blocks_count
170 printf("new block bitmap is at 0x%04x\n", input.block_bitmap);
171 printf("new inode bitmap is at 0x%04x\n", input.inode_bitmap);
172 printf("new inode table is at 0x%04x-0x%04x\n",
174 input.inode_table + new_fs->inode_blocks_per_group-1);
175 printf("new group has %u blocks\n", input.blocks_count);
176 printf("new group will reserve %d blocks\n",
177 input.reserved_blocks);
178 printf("new group has %d free blocks\n",
179 ext2fs_bg_free_blocks_count(new_fs, i),
180 printf("new group has %d free inodes (%d blocks)\n",
181 ext2fs_bg_free_inodes_count(new_fs, i),
182 new_fs->inode_blocks_per_group);
183 printf("Adding group #%d\n", input.group);
187 ioctl(fd, EXT2_IOC_GROUP_ADD, &input) == 0)
192 input64.group = input.group;
193 input64.block_bitmap = input.block_bitmap;
194 input64.inode_bitmap = input.inode_bitmap;
195 input64.inode_table = input.inode_table;
196 input64.blocks_count = input.blocks_count;
197 input64.reserved_blocks = input.reserved_blocks;
198 input64.unused = input.unused;
200 if (ioctl(fd, EXT4_IOC_GROUP_ADD, &input64) < 0) {
201 com_err(program_name, errno,
202 _("While trying to add group #%d"),
213 printf(_("Filesystem at %s is mounted on %s, and on-line resizing is "
214 "not supported on this system.\n"), fs->device_name, mtpt);