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 (EXT2_HAS_COMPAT_FEATURE(fs
->super
,
80 EXT4_FEATURE_COMPAT_SPARSE_SUPER2
) &&
81 (access("/sys/fs/ext4/features/sparse_super2", R_OK
) != 0)) {
82 com_err(program_name
, 0, _("kernel does not support online "
83 "resize with sparse_super2"));
87 printf(_("Filesystem at %s is mounted on %s; "
88 "on-line resizing required\n"), fs
->device_name
, mtpt
);
90 if (*new_size
< ext2fs_blocks_count(sb
)) {
91 com_err(program_name
, 0, _("On-line shrinking not supported"));
96 * If the number of descriptor blocks is going to increase,
97 * the on-line resizing inode must be present.
99 new_desc_blocks
= ext2fs_div_ceil(
100 ext2fs_div64_ceil(*new_size
-
101 fs
->super
->s_first_data_block
,
102 EXT2_BLOCKS_PER_GROUP(fs
->super
)),
103 EXT2_DESC_PER_BLOCK(fs
->super
));
104 printf("old_desc_blocks = %lu, new_desc_blocks = %lu\n",
105 fs
->desc_blocks
, new_desc_blocks
);
108 * Do error checking to make sure the resize will be successful.
110 if ((access("/sys/fs/ext4/features/meta_bg_resize", R_OK
) != 0) ||
112 if (!EXT2_HAS_COMPAT_FEATURE(fs
->super
,
113 EXT2_FEATURE_COMPAT_RESIZE_INODE
) &&
114 (new_desc_blocks
!= fs
->desc_blocks
)) {
115 com_err(program_name
, 0,
116 _("Filesystem does not support online resizing"));
120 if (EXT2_HAS_COMPAT_FEATURE(fs
->super
,
121 EXT2_FEATURE_COMPAT_RESIZE_INODE
) &&
122 new_desc_blocks
> (fs
->desc_blocks
+
123 fs
->super
->s_reserved_gdt_blocks
)) {
124 com_err(program_name
, 0,
125 _("Not enough reserved gdt blocks for resizing"));
129 if ((ext2fs_blocks_count(sb
) > MAX_32_NUM
) ||
130 (*new_size
> MAX_32_NUM
)) {
131 com_err(program_name
, 0,
132 _("Kernel does not support resizing a file system this large"));
137 fd
= open(mtpt
, O_RDONLY
);
139 com_err(program_name
, errno
,
140 _("while trying to open mountpoint %s"), mtpt
);
144 if (no_resize_ioctl
) {
145 printf(_("Old resize interface requested.\n"));
146 } else if (ioctl(fd
, EXT4_IOC_RESIZE_FS
, new_size
)) {
148 * If kernel does not support EXT4_IOC_RESIZE_FS, use the
149 * old online resize. Note that the old approach does not
150 * handle >32 bit file systems
152 * Sigh, if we are running a 32-bit binary on a 64-bit
153 * kernel (which happens all the time on the MIPS
154 * architecture in Debian, but can happen on other CPU
155 * architectures as well) we will get EINVAL returned
156 * when an ioctl doesn't exist, at least up to Linux
157 * 3.1. See compat_sys_ioctl() in fs/compat_ioctl.c
158 * in the kernel sources. This is probably a kernel
159 * bug, but work around it here.
161 if ((errno
!= ENOTTY
) && (errno
!= EINVAL
)) {
163 com_err(program_name
, 0,
164 _("Permission denied to resize filesystem"));
166 com_err(program_name
, errno
,
167 _("While checking for on-line resizing "
176 size
= ext2fs_blocks_count(sb
);
178 if (ioctl(fd
, EXT2_IOC_GROUP_EXTEND
, &size
)) {
180 com_err(program_name
, 0,
181 _("Permission denied to resize filesystem"));
182 else if (errno
== ENOTTY
)
183 com_err(program_name
, 0,
184 _("Kernel does not support online resizing"));
186 com_err(program_name
, errno
,
187 _("While checking for on-line resizing support"));
191 percent
= (ext2fs_r_blocks_count(sb
) * 100.0) /
192 ext2fs_blocks_count(sb
);
194 retval
= ext2fs_read_bitmaps(fs
);
200 retval
= ext2fs_dup_handle(fs
, &new_fs
);
206 /* The current method of adding one block group at a time to a
207 * mounted filesystem means it is impossible to accomodate the
208 * flex_bg allocation method of placing the metadata together
209 * in a single block group. For now we "fix" this issue by
210 * using the traditional layout for new block groups, where
211 * each block group is self-contained and contains its own
212 * bitmap blocks and inode tables. This means we don't get
213 * the layout advantages of flex_bg in the new block groups,
214 * but at least it allows on-line resizing to function.
216 new_fs
->super
->s_feature_incompat
&= ~EXT4_FEATURE_INCOMPAT_FLEX_BG
;
217 retval
= adjust_fs_info(new_fs
, fs
, 0, *new_size
);
223 printf(_("Performing an on-line resize of %s to %llu (%dk) blocks.\n"),
224 fs
->device_name
, *new_size
, fs
->blocksize
/ 1024);
226 size
= fs
->group_desc_count
* sb
->s_blocks_per_group
+
227 sb
->s_first_data_block
;
228 if (size
> *new_size
)
231 if (ioctl(fd
, EXT2_IOC_GROUP_EXTEND
, &size
)) {
232 com_err(program_name
, errno
,
233 _("While trying to extend the last group"));
237 for (i
= fs
->group_desc_count
;
238 i
< new_fs
->group_desc_count
; i
++) {
240 overhead
= (int) (2 + new_fs
->inode_blocks_per_group
);
242 if (ext2fs_bg_has_super(new_fs
, new_fs
->group_desc_count
- 1))
243 overhead
+= 1 + new_fs
->desc_blocks
+
244 new_fs
->super
->s_reserved_gdt_blocks
;
247 input
.block_bitmap
= ext2fs_block_bitmap_loc(new_fs
, i
);
248 input
.inode_bitmap
= ext2fs_inode_bitmap_loc(new_fs
, i
);
249 input
.inode_table
= ext2fs_inode_table_loc(new_fs
, i
);
250 input
.blocks_count
= ext2fs_group_blocks_count(new_fs
, i
);
251 input
.reserved_blocks
= (blk_t
) (percent
* input
.blocks_count
255 printf("new block bitmap is at 0x%04x\n", input
.block_bitmap
);
256 printf("new inode bitmap is at 0x%04x\n", input
.inode_bitmap
);
257 printf("new inode table is at 0x%04x-0x%04x\n",
259 input
.inode_table
+ new_fs
->inode_blocks_per_group
-1);
260 printf("new group has %u blocks\n", input
.blocks_count
);
261 printf("new group will reserve %d blocks\n",
262 input
.reserved_blocks
);
263 printf("new group has %d free blocks\n",
264 ext2fs_bg_free_blocks_count(new_fs
, i
),
265 printf("new group has %d free inodes (%d blocks)\n",
266 ext2fs_bg_free_inodes_count(new_fs
, i
),
267 new_fs
->inode_blocks_per_group
);
268 printf("Adding group #%d\n", input
.group
);
272 ioctl(fd
, EXT2_IOC_GROUP_ADD
, &input
) == 0)
277 input64
.group
= input
.group
;
278 input64
.block_bitmap
= input
.block_bitmap
;
279 input64
.inode_bitmap
= input
.inode_bitmap
;
280 input64
.inode_table
= input
.inode_table
;
281 input64
.blocks_count
= input
.blocks_count
;
282 input64
.reserved_blocks
= input
.reserved_blocks
;
283 input64
.unused
= input
.unused
;
285 if (ioctl(fd
, EXT4_IOC_GROUP_ADD
, &input64
) < 0) {
286 com_err(program_name
, errno
,
287 _("While trying to add group #%d"),
298 printf(_("Filesystem at %s is mounted on %s, and on-line resizing is "
299 "not supported on this system.\n"), fs
->device_name
, mtpt
);