1 /*
2 * online.c --- Do on-line resizing of the ext3 filesystem
3 *
4 * Copyright (C) 2006 by Theodore Ts'o
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12 #include "resize2fs.h"
13 #ifdef HAVE_SYS_IOCTL_H
14 #include <sys/ioctl.h>
15 #endif
16 #include <sys/stat.h>
17 #include <fcntl.h>
18
19 extern char *program_name;
20
online_resize_fs(ext2_filsys fs,const char * mtpt,blk_t * new_size,int flags EXT2FS_ATTR ((unused)))21 errcode_t online_resize_fs(ext2_filsys fs, const char *mtpt,
22 blk_t *new_size, int flags EXT2FS_ATTR((unused)))
23 {
24 #ifdef __linux__
25 struct ext2_new_group_input input;
26 struct ext2_super_block *sb = fs->super;
27 unsigned long new_desc_blocks;
28 ext2_filsys new_fs;
29 errcode_t retval;
30 dgrp_t i;
31 blk_t size;
32 int fd, r_frac, overhead;
33
34 printf(_("Filesystem at %s is mounted on %s; "
35 "on-line resizing required\n"), fs->device_name, mtpt);
36
37 if (*new_size < sb->s_blocks_count) {
38 printf(_("On-line shrinking from %u to %u not supported.\n"),
39 sb->s_blocks_count, *new_size);
40 exit(1);
41 }
42
43 /*
44 * If the number of descriptor blocks is going to increase,
45 * the on-line resizing inode must be present.
46 */
47 new_desc_blocks = ext2fs_div_ceil(
48 ext2fs_div_ceil(*new_size -
49 fs->super->s_first_data_block,
50 EXT2_BLOCKS_PER_GROUP(fs->super)),
51 EXT2_DESC_PER_BLOCK(fs->super));
52 printf("old desc_blocks = %lu, new_desc_blocks = %lu\n",
53 fs->desc_blocks, new_desc_blocks);
54 if (!(fs->super->s_feature_compat &
55 EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
56 new_desc_blocks != fs->desc_blocks) {
57 com_err(program_name, 0,
58 _("Filesystem does not support online resizing"));
59 exit(1);
60 }
61
62 fd = open(mtpt, O_RDONLY);
63 if (fd < 0) {
64 com_err(program_name, errno,
65 _("while trying to open mountpoint %s"), mtpt);
66 exit(1);
67 }
68
69 size=sb->s_blocks_count;
70 if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
71 if (errno == EPERM)
72 com_err(program_name, 0,
73 _("Permission denied to resize filesystem"));
74 else if (errno == ENOTTY)
75 com_err(program_name, 0,
76 _("Kernel does not support online resizing"));
77 else
78 com_err(program_name, errno,
79 _("While checking for on-line resizing support"));
80 exit(1);
81 }
82
83 r_frac = ext2fs_div_ceil(100 * sb->s_r_blocks_count, sb->s_blocks_count);
84
85 retval = ext2fs_read_bitmaps(fs);
86 if (retval)
87 return retval;
88
89 retval = ext2fs_dup_handle(fs, &new_fs);
90 if (retval)
91 return retval;
92
93 retval = adjust_fs_info(new_fs, fs, *new_size);
94 if (retval)
95 return retval;
96
97 printf(_("Performing an on-line resize of %s to %u (%dk) blocks.\n"),
98 fs->device_name, *new_size, fs->blocksize / 1024);
99
100 size = fs->group_desc_count * sb->s_blocks_per_group +
101 sb->s_first_data_block;
102 if (size > *new_size)
103 size = *new_size;
104
105 if (ioctl(fd, EXT2_IOC_GROUP_EXTEND, &size)) {
106 com_err(program_name, errno,
107 _("While trying to extend the last group"));
108 exit(1);
109 }
110
111 for (i = fs->group_desc_count;
112 i < new_fs->group_desc_count; i++) {
113
114 overhead = (int) (2 + new_fs->inode_blocks_per_group);
115
116 if (ext2fs_bg_has_super(new_fs, new_fs->group_desc_count - 1))
117 overhead += 1 + new_fs->desc_blocks +
118 new_fs->super->s_reserved_gdt_blocks;
119
120 input.group = i;
121 input.block_bitmap = new_fs->group_desc[i].bg_block_bitmap;
122 input.inode_bitmap = new_fs->group_desc[i].bg_inode_bitmap;
123 input.inode_table = new_fs->group_desc[i].bg_inode_table;
124 input.blocks_count = sb->s_blocks_per_group;
125 if (i == new_fs->group_desc_count-1) {
126 input.blocks_count = new_fs->super->s_blocks_count -
127 sb->s_first_data_block -
128 (i * sb->s_blocks_per_group);
129 }
130 input.reserved_blocks = e2p_percent(r_frac,
131 input.blocks_count);
132
133 #if 0
134 printf("new block bitmap is at 0x%04x\n", input.block_bitmap);
135 printf("new inode bitmap is at 0x%04x\n", input.inode_bitmap);
136 printf("new inode table is at 0x%04x-0x%04x\n",
137 input.inode_table,
138 input.inode_table + new_fs->inode_blocks_per_group-1);
139 printf("new group has %u blocks\n", input.blocks_count);
140 printf("new group will reserve %d blocks\n",
141 input.reserved_blocks);
142 printf("new group has %d free blocks\n",
143 new_fs->group_desc[i].bg_free_blocks_count);
144 printf("new group has %d free inodes (%d blocks)\n",
145 new_fs->group_desc[i].bg_free_inodes_count,
146 new_fs->inode_blocks_per_group);
147 printf("Adding group #%d\n", input.group);
148 #endif
149
150 if (ioctl(fd, EXT2_IOC_GROUP_ADD, &input) < 0) {
151 com_err(program_name, errno,
152 _("While trying to add group #%d"),
153 input.group);
154 exit(1);
155 }
156 }
157
158 ext2fs_free(new_fs);
159 close(fd);
160
161 return 0;
162 #else
163 printf(_("Filesystem at %s is mounted on %s, and on-line resizing is"
164 "not supported on this system.\n"), fs->device_name, mtpt);
165 exit(1);
166 #endif
167 }
168