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)
25 static int parse_version_number(const char *s
)
27 int major
, minor
, rev
;
33 major
= strtol(cp
, &endptr
, 10);
34 if (cp
== endptr
|| *endptr
!= '.')
37 minor
= strtol(cp
, &endptr
, 10);
38 if (cp
== endptr
|| *endptr
!= '.')
41 rev
= strtol(cp
, &endptr
, 10);
44 return ((((major
* 256) + minor
) * 256) + rev
);
47 #define VERSION_CODE(a,b,c) (((a) << 16) + ((b) << 8) + (c))
51 errcode_t
online_resize_fs(ext2_filsys fs
, const char *mtpt
,
52 blk64_t
*new_size
, int flags
EXT2FS_ATTR((unused
)))
55 struct ext2_new_group_input input
;
56 struct ext4_new_group_input input64
;
57 struct ext2_super_block
*sb
= fs
->super
;
58 unsigned long new_desc_blocks
;
65 int use_old_ioctl
= 1;
66 int no_meta_bg_resize
= 0;
67 int no_resize_ioctl
= 0;
69 if (getenv("RESIZE2FS_KERNEL_VERSION")) {
70 char *version_to_emulate
= getenv("RESIZE2FS_KERNEL_VERSION");
71 int kvers
= parse_version_number(version_to_emulate
);
73 if (kvers
< VERSION_CODE(3, 7, 0))
74 no_meta_bg_resize
= 1;
75 if (kvers
< VERSION_CODE(3, 3, 0))
79 if (ext2fs_has_feature_sparse_super2(fs
->super
) &&
80 (access("/sys/fs/ext4/features/sparse_super2", R_OK
) != 0)) {
81 com_err(program_name
, 0, _("kernel does not support online "
82 "resize with sparse_super2"));
86 printf(_("Filesystem at %s is mounted on %s; "
87 "on-line resizing required\n"), fs
->device_name
, mtpt
);
89 if (*new_size
< ext2fs_blocks_count(sb
)) {
90 com_err(program_name
, 0, _("On-line shrinking not supported"));
95 * If the number of descriptor blocks is going to increase,
96 * the on-line resizing inode must be present.
98 new_desc_blocks
= ext2fs_div_ceil(
99 ext2fs_div64_ceil(*new_size
-
100 fs
->super
->s_first_data_block
,
101 EXT2_BLOCKS_PER_GROUP(fs
->super
)),
102 EXT2_DESC_PER_BLOCK(fs
->super
));
103 printf("old_desc_blocks = %lu, new_desc_blocks = %lu\n",
104 fs
->desc_blocks
, new_desc_blocks
);
107 * Do error checking to make sure the resize will be successful.
109 if ((access("/sys/fs/ext4/features/meta_bg_resize", R_OK
) != 0) ||
111 if (!ext2fs_has_feature_resize_inode(fs
->super
) &&
112 (new_desc_blocks
!= fs
->desc_blocks
)) {
113 com_err(program_name
, 0,
114 _("Filesystem does not support online resizing"));
118 if (ext2fs_has_feature_resize_inode(fs
->super
) &&
119 new_desc_blocks
> (fs
->desc_blocks
+
120 fs
->super
->s_reserved_gdt_blocks
)) {
121 com_err(program_name
, 0,
122 _("Not enough reserved gdt blocks for resizing"));
126 if ((ext2fs_blocks_count(sb
) > MAX_32_NUM
) ||
127 (*new_size
> MAX_32_NUM
)) {
128 com_err(program_name
, 0,
129 _("Kernel does not support resizing a file system this large"));
134 fd
= open(mtpt
, O_RDONLY
);
136 com_err(program_name
, errno
,
137 _("while trying to open mountpoint %s"), mtpt
);
141 if (no_resize_ioctl
) {
142 printf(_("Old resize interface requested.\n"));
143 } else if (ioctl(fd
, EXT4_IOC_RESIZE_FS
, new_size
)) {
145 * If kernel does not support EXT4_IOC_RESIZE_FS, use the
146 * old online resize. Note that the old approach does not
147 * handle >32 bit file systems
149 * Sigh, if we are running a 32-bit binary on a 64-bit
150 * kernel (which happens all the time on the MIPS
151 * architecture in Debian, but can happen on other CPU
152 * architectures as well) we will get EINVAL returned
153 * when an ioctl doesn't exist, at least up to Linux
154 * 3.1. See compat_sys_ioctl() in fs/compat_ioctl.c
155 * in the kernel sources. This is probably a kernel
156 * bug, but work around it here.
158 if ((errno
!= ENOTTY
) && (errno
!= EINVAL
)) {
160 com_err(program_name
, 0,
161 _("Permission denied to resize filesystem"));
163 com_err(program_name
, errno
,
164 _("While checking for on-line resizing "
173 size
= ext2fs_blocks_count(sb
);
175 if (ioctl(fd
, EXT2_IOC_GROUP_EXTEND
, &size
)) {
177 com_err(program_name
, 0,
178 _("Permission denied to resize filesystem"));
179 else if (errno
== ENOTTY
)
180 com_err(program_name
, 0,
181 _("Kernel does not support online resizing"));
183 com_err(program_name
, errno
,
184 _("While checking for on-line resizing support"));
188 percent
= (ext2fs_r_blocks_count(sb
) * 100.0) /
189 ext2fs_blocks_count(sb
);
191 retval
= ext2fs_read_bitmaps(fs
);
197 retval
= ext2fs_dup_handle(fs
, &new_fs
);
203 /* The current method of adding one block group at a time to a
204 * mounted filesystem means it is impossible to accommodate the
205 * flex_bg allocation method of placing the metadata together
206 * in a single block group. For now we "fix" this issue by
207 * using the traditional layout for new block groups, where
208 * each block group is self-contained and contains its own
209 * bitmap blocks and inode tables. This means we don't get
210 * the layout advantages of flex_bg in the new block groups,
211 * but at least it allows on-line resizing to function.
213 ext2fs_clear_feature_flex_bg(new_fs
->super
);
214 retval
= adjust_fs_info(new_fs
, fs
, 0, *new_size
);
220 printf(_("Performing an on-line resize of %s to %llu (%dk) blocks.\n"),
221 fs
->device_name
, *new_size
, fs
->blocksize
/ 1024);
223 size
= fs
->group_desc_count
* sb
->s_blocks_per_group
+
224 sb
->s_first_data_block
;
225 if (size
> *new_size
)
228 if (ioctl(fd
, EXT2_IOC_GROUP_EXTEND
, &size
)) {
229 com_err(program_name
, errno
,
230 _("While trying to extend the last group"));
234 for (i
= fs
->group_desc_count
;
235 i
< new_fs
->group_desc_count
; i
++) {
237 overhead
= (int) (2 + new_fs
->inode_blocks_per_group
);
239 if (ext2fs_bg_has_super(new_fs
, new_fs
->group_desc_count
- 1))
240 overhead
+= 1 + new_fs
->desc_blocks
+
241 new_fs
->super
->s_reserved_gdt_blocks
;
244 input
.block_bitmap
= ext2fs_block_bitmap_loc(new_fs
, i
);
245 input
.inode_bitmap
= ext2fs_inode_bitmap_loc(new_fs
, i
);
246 input
.inode_table
= ext2fs_inode_table_loc(new_fs
, i
);
247 input
.blocks_count
= ext2fs_group_blocks_count(new_fs
, i
);
248 input
.reserved_blocks
= (blk_t
) (percent
* input
.blocks_count
252 printf("new block bitmap is at 0x%04x\n", input
.block_bitmap
);
253 printf("new inode bitmap is at 0x%04x\n", input
.inode_bitmap
);
254 printf("new inode table is at 0x%04x-0x%04x\n",
256 input
.inode_table
+ new_fs
->inode_blocks_per_group
-1);
257 printf("new group has %u blocks\n", input
.blocks_count
);
258 printf("new group will reserve %d blocks\n",
259 input
.reserved_blocks
);
260 printf("new group has %d free blocks\n",
261 ext2fs_bg_free_blocks_count(new_fs
, i
),
262 printf("new group has %d free inodes (%d blocks)\n",
263 ext2fs_bg_free_inodes_count(new_fs
, i
),
264 new_fs
->inode_blocks_per_group
);
265 printf("Adding group #%d\n", input
.group
);
269 ioctl(fd
, EXT2_IOC_GROUP_ADD
, &input
) == 0)
274 input64
.group
= input
.group
;
275 input64
.block_bitmap
= input
.block_bitmap
;
276 input64
.inode_bitmap
= input
.inode_bitmap
;
277 input64
.inode_table
= input
.inode_table
;
278 input64
.blocks_count
= input
.blocks_count
;
279 input64
.reserved_blocks
= input
.reserved_blocks
;
280 input64
.unused
= input
.unused
;
282 if (ioctl(fd
, EXT4_IOC_GROUP_ADD
, &input64
) < 0) {
283 com_err(program_name
, errno
,
284 _("While trying to add group #%d"),
295 printf(_("Filesystem at %s is mounted on %s, and on-line resizing is "
296 "not supported on this system.\n"), fs
->device_name
, mtpt
);