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
);
72 if (ioctl(fd
, EXT2_IOC_GROUP_EXTEND
, &size
)) {
74 com_err(program_name
, 0,
75 _("Permission denied to resize filesystem"));
76 else if (errno
== ENOTTY
)
77 com_err(program_name
, 0,
78 _("Kernel does not support online resizing"));
80 com_err(program_name
, errno
,
81 _("While checking for on-line resizing support"));
85 percent
= (ext2fs_r_blocks_count(sb
) * 100.0) /
86 ext2fs_blocks_count(sb
);
88 retval
= ext2fs_read_bitmaps(fs
);
92 retval
= ext2fs_dup_handle(fs
, &new_fs
);
96 /* The current method of adding one block group at a time to a
97 * mounted filesystem means it is impossible to accomodate the
98 * flex_bg allocation method of placing the metadata together
99 * in a single block group. For now we "fix" this issue by
100 * using the traditional layout for new block groups, where
101 * each block group is self-contained and contains its own
102 * bitmap blocks and inode tables. This means we don't get
103 * the layout advantages of flex_bg in the new block groups,
104 * but at least it allows on-line resizing to function.
106 new_fs
->super
->s_feature_incompat
&= ~EXT4_FEATURE_INCOMPAT_FLEX_BG
;
107 retval
= adjust_fs_info(new_fs
, fs
, 0, *new_size
);
111 printf(_("Performing an on-line resize of %s to %llu (%dk) blocks.\n"),
112 fs
->device_name
, *new_size
, fs
->blocksize
/ 1024);
114 size
= fs
->group_desc_count
* sb
->s_blocks_per_group
+
115 sb
->s_first_data_block
;
116 if (size
> *new_size
)
119 if (ioctl(fd
, EXT2_IOC_GROUP_EXTEND
, &size
)) {
120 com_err(program_name
, errno
,
121 _("While trying to extend the last group"));
125 for (i
= fs
->group_desc_count
;
126 i
< new_fs
->group_desc_count
; i
++) {
128 overhead
= (int) (2 + new_fs
->inode_blocks_per_group
);
130 if (ext2fs_bg_has_super(new_fs
, new_fs
->group_desc_count
- 1))
131 overhead
+= 1 + new_fs
->desc_blocks
+
132 new_fs
->super
->s_reserved_gdt_blocks
;
135 input
.block_bitmap
= ext2fs_block_bitmap_loc(new_fs
, i
);
136 input
.inode_bitmap
= ext2fs_inode_bitmap_loc(new_fs
, i
);
137 input
.inode_table
= ext2fs_inode_table_loc(new_fs
, i
);
138 input
.blocks_count
= sb
->s_blocks_per_group
;
139 if (i
== new_fs
->group_desc_count
-1) {
140 input
.blocks_count
= ext2fs_blocks_count(new_fs
->super
) -
141 sb
->s_first_data_block
-
142 (i
* sb
->s_blocks_per_group
);
144 input
.reserved_blocks
= (blk_t
) (percent
* input
.blocks_count
148 printf("new block bitmap is at 0x%04x\n", input
.block_bitmap
);
149 printf("new inode bitmap is at 0x%04x\n", input
.inode_bitmap
);
150 printf("new inode table is at 0x%04x-0x%04x\n",
152 input
.inode_table
+ new_fs
->inode_blocks_per_group
-1);
153 printf("new group has %u blocks\n", input
.blocks_count
);
154 printf("new group will reserve %d blocks\n",
155 input
.reserved_blocks
);
156 printf("new group has %d free blocks\n",
157 ext2fs_bg_free_blocks_count(new_fs
, i
),
158 printf("new group has %d free inodes (%d blocks)\n",
159 ext2fs_bg_free_inodes_count(new_fs
, i
),
160 new_fs
->inode_blocks_per_group
);
161 printf("Adding group #%d\n", input
.group
);
165 ioctl(fd
, EXT2_IOC_GROUP_ADD
, &input
) == 0)
170 input64
.group
= input
.group
;
171 input64
.block_bitmap
= input
.block_bitmap
;
172 input64
.inode_bitmap
= input
.inode_bitmap
;
173 input64
.inode_table
= input
.inode_table
;
174 input64
.blocks_count
= input
.blocks_count
;
175 input64
.reserved_blocks
= input
.reserved_blocks
;
176 input64
.unused
= input
.unused
;
178 if (ioctl(fd
, EXT4_IOC_GROUP_ADD
, &input64
) < 0) {
179 com_err(program_name
, errno
,
180 _("While trying to add group #%d"),
191 printf(_("Filesystem at %s is mounted on %s, and on-line resizing is "
192 "not supported on this system.\n"), fs
->device_name
, mtpt
);