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 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
