1 /* 2 * PROJECT: Mke2fs 3 * FILE: Super.c 4 * PROGRAMMER: Matt Wu <mattwu@163.com> 5 * HOMEPAGE: http://ext2.yeah.net 6 */ 7 8 /* INCLUDES **************************************************************/ 9 10 #include "Mke2fs.h" 11 #include <debug.h> 12 13 /* DEFINITIONS ***********************************************************/ 14 15 extern int inode_ratio; 16 17 18 /* FUNCTIONS *************************************************************/ 19 20 void ext2_print_super(PEXT2_SUPER_BLOCK pExt2Sb) 21 { 22 int i; 23 24 DPRINT("\nExt2 Super Block Details ...\n\n"); 25 DPRINT(" Inode Count: %lu\n", pExt2Sb->s_inodes_count); 26 DPRINT(" Block Count: %lu\n", pExt2Sb->s_blocks_count); 27 DPRINT(" Reserved Block Count: %lu\n", pExt2Sb->s_r_blocks_count); 28 DPRINT(" Free Blocks: %lu\n", pExt2Sb->s_free_blocks_count); 29 DPRINT(" Free Inodes: %lu\n", pExt2Sb->s_free_inodes_count); 30 DPRINT(" First Data Block: %lu\n", pExt2Sb->s_first_data_block); 31 DPRINT(" Log Block Size: %lu\n", pExt2Sb->s_log_block_size); 32 DPRINT(" Log Frag Size: %ld\n", pExt2Sb->s_log_frag_size); 33 DPRINT(" Blocks per Group: %lu\n", pExt2Sb->s_blocks_per_group); 34 DPRINT(" Fragments per Group: %lu\n", pExt2Sb->s_frags_per_group); 35 DPRINT(" Inodes per Group: %lu\n", pExt2Sb->s_inodes_per_group); 36 // DPRINT(" Mount Time: %s", ctime((time_t *) & (pExt2Sb->s_mtime))); 37 // DPRINT(" Write Time: %s", ctime((time_t *) & (pExt2Sb->s_wtime))); 38 DPRINT(" Mount Count: %u\n", pExt2Sb->s_mnt_count); 39 DPRINT(" Max Mount Count: %d\n", pExt2Sb->s_max_mnt_count); 40 DPRINT(" Magic Number: %X (%s)\n", pExt2Sb->s_magic, 41 pExt2Sb->s_magic == EXT2_SUPER_MAGIC ? "OK" : "BAD"); 42 DPRINT(" File System State: %X\n", pExt2Sb->s_state); 43 DPRINT(" Error Behaviour: %X\n", pExt2Sb->s_errors); 44 DPRINT(" Minor rev: %u\n", pExt2Sb->s_minor_rev_level); 45 // DPRINT(" Last Check: %s", ctime((time_t *) & (pExt2Sb->s_lastcheck))); 46 DPRINT(" Check Interval: %lu\n", pExt2Sb->s_checkinterval); 47 DPRINT(" Creator OS: %lu\n", pExt2Sb->s_creator_os); 48 DPRINT(" Revision Level: %lu\n", pExt2Sb->s_rev_level); 49 DPRINT(" Reserved Block Default UID: %u\n", pExt2Sb->s_def_resuid); 50 DPRINT(" Reserved Block Default GID: %u\n", pExt2Sb->s_def_resgid); 51 DPRINT(" uuid = "); 52 for (i=0; i < 16; i++) 53 DbgPrint("%x ", pExt2Sb->s_uuid[i]); 54 DbgPrint("\n"); 55 56 DPRINT(" volume label name: "); 57 for (i=0; i < 16; i++) 58 { 59 if (pExt2Sb->s_volume_name[i] == 0) 60 break; 61 DbgPrint("%c", pExt2Sb->s_volume_name[i]); 62 } 63 DbgPrint("\n"); 64 65 DPRINT("\n\n"); 66 } 67 68 #define set_field(field, default) if (!pExt2Sb->field) pExt2Sb->field = (default); 69 70 /* 71 * Initialize super block ... 72 */ 73 74 bool ext2_initialize_sb(PEXT2_FILESYS Ext2Sys) 75 { 76 int frags_per_block = 0; 77 ULONG overhead = 0; 78 ULONG rem = 0; 79 ULONG i = 0; 80 ULONG group_block = 0; 81 ULONG numblocks = 0; 82 PEXT2_SUPER_BLOCK pExt2Sb = Ext2Sys->ext2_sb; 83 LARGE_INTEGER SysTime; 84 85 NtQuerySystemTime(&SysTime); 86 87 Ext2Sys->blocksize = EXT2_BLOCK_SIZE(pExt2Sb); 88 Ext2Sys->fragsize = EXT2_FRAG_SIZE(pExt2Sb); 89 frags_per_block = Ext2Sys->blocksize / Ext2Sys->fragsize; 90 91 pExt2Sb->s_magic = EXT2_SUPER_MAGIC; 92 pExt2Sb->s_state = EXT2_VALID_FS; 93 94 pExt2Sb->s_first_data_block = (pExt2Sb->s_log_block_size) ? 0 : 1; 95 pExt2Sb->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT; 96 97 pExt2Sb->s_errors = EXT2_ERRORS_DEFAULT; 98 99 pExt2Sb->s_checkinterval = EXT2_DFL_CHECKINTERVAL; 100 101 if (!pExt2Sb->s_rev_level) 102 pExt2Sb->s_rev_level = EXT2_GOOD_OLD_REV; 103 104 if (pExt2Sb->s_rev_level >= EXT2_DYNAMIC_REV) 105 { 106 set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO); 107 set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE); 108 } 109 110 RtlTimeToSecondsSince1970(&SysTime, &pExt2Sb->s_wtime); 111 pExt2Sb->s_lastcheck = pExt2Sb->s_mtime = pExt2Sb->s_wtime; 112 113 if (!pExt2Sb->s_blocks_per_group) 114 pExt2Sb->s_blocks_per_group = Ext2Sys->blocksize * 8; 115 116 pExt2Sb->s_frags_per_group = pExt2Sb->s_blocks_per_group * frags_per_block; 117 pExt2Sb->s_creator_os = EXT2_OS_WINNT; 118 119 if (pExt2Sb->s_r_blocks_count >= pExt2Sb->s_blocks_count) 120 { 121 goto cleanup; 122 } 123 124 /* 125 * If we're creating an external journal device, we don't need 126 * to bother with the rest. 127 */ 128 if (pExt2Sb->s_feature_incompat & 129 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) 130 { 131 Ext2Sys->group_desc_count = 0; 132 // ext2fs_mark_super_dirty(fs); 133 return true; 134 } 135 136 retry: 137 138 Ext2Sys->group_desc_count = (pExt2Sb->s_blocks_count - pExt2Sb->s_first_data_block 139 + EXT2_BLOCKS_PER_GROUP(pExt2Sb) - 1) / EXT2_BLOCKS_PER_GROUP(pExt2Sb); 140 141 if (Ext2Sys->group_desc_count == 0) 142 return false; 143 144 Ext2Sys->desc_blocks = (Ext2Sys->group_desc_count + EXT2_DESC_PER_BLOCK(pExt2Sb) 145 - 1) / EXT2_DESC_PER_BLOCK(pExt2Sb); 146 147 if (!pExt2Sb->s_inodes_count) 148 pExt2Sb->s_inodes_count = pExt2Sb->s_blocks_count / ( inode_ratio /Ext2Sys->blocksize); 149 150 /* 151 * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so 152 * that we have enough inodes for the filesystem(!) 153 */ 154 if (pExt2Sb->s_inodes_count < EXT2_FIRST_INODE(pExt2Sb)+1) 155 pExt2Sb->s_inodes_count = EXT2_FIRST_INODE(pExt2Sb)+1; 156 157 /* 158 * There should be at least as many inodes as the user 159 * requested. Figure out how many inodes per group that 160 * should be. But make sure that we don't allocate more than 161 * one bitmap's worth of inodes 162 */ 163 pExt2Sb->s_inodes_per_group = (pExt2Sb->s_inodes_count + Ext2Sys->group_desc_count - 1) 164 /Ext2Sys->group_desc_count; 165 166 if (pExt2Sb->s_inodes_per_group > (ULONG)(Ext2Sys->blocksize*8)) 167 pExt2Sb->s_inodes_per_group = Ext2Sys->blocksize*8; 168 169 /* 170 * Make sure the number of inodes per group completely fills 171 * the inode table blocks in the descriptor. If not, add some 172 * additional inodes/group. Waste not, want not... 173 */ 174 Ext2Sys->inode_blocks_per_group = (((pExt2Sb->s_inodes_per_group * EXT2_INODE_SIZE(pExt2Sb)) 175 + EXT2_BLOCK_SIZE(pExt2Sb) - 1) / EXT2_BLOCK_SIZE(pExt2Sb)); 176 177 pExt2Sb->s_inodes_per_group = ((Ext2Sys->inode_blocks_per_group * EXT2_BLOCK_SIZE(pExt2Sb)) 178 / EXT2_INODE_SIZE(pExt2Sb)); 179 180 /* 181 * Finally, make sure the number of inodes per group is a 182 * multiple of 8. This is needed to simplify the bitmap 183 * splicing code. 184 */ 185 pExt2Sb->s_inodes_per_group &= ~7; 186 Ext2Sys->inode_blocks_per_group = (((pExt2Sb->s_inodes_per_group * EXT2_INODE_SIZE(pExt2Sb)) 187 + EXT2_BLOCK_SIZE(pExt2Sb) - 1) / EXT2_BLOCK_SIZE(pExt2Sb)); 188 189 /* 190 * adjust inode count to reflect the adjusted inodes_per_group 191 */ 192 pExt2Sb->s_inodes_count = pExt2Sb->s_inodes_per_group * Ext2Sys->group_desc_count; 193 pExt2Sb->s_free_inodes_count = pExt2Sb->s_inodes_count; 194 195 /* 196 * Overhead is the number of bookkeeping blocks per group. It 197 * includes the superblock backup, the group descriptor 198 * backups, the inode bitmap, the block bitmap, and the inode 199 * table. 200 * 201 * XXX Not all block groups need the descriptor blocks, but 202 * being clever is tricky... 203 */ 204 overhead = (3 + Ext2Sys->desc_blocks + Ext2Sys->inode_blocks_per_group); 205 206 /* 207 * See if the last group is big enough to support the 208 * necessary data structures. If not, we need to get rid of 209 * it. 210 */ 211 rem = ((pExt2Sb->s_blocks_count - pExt2Sb->s_first_data_block) % 212 pExt2Sb->s_blocks_per_group); 213 214 if ((Ext2Sys->group_desc_count == 1) && rem && (rem < overhead)) 215 return false; 216 217 if (rem && (rem < overhead+50)) 218 { 219 pExt2Sb->s_blocks_count -= rem; 220 goto retry; 221 } 222 223 /* 224 * At this point we know how big the filesystem will be. So we can do 225 * any and all allocations that depend on the block count. 226 */ 227 228 // Allocate block bitmap 229 if(!ext2_allocate_block_bitmap(Ext2Sys)) 230 { 231 goto cleanup; 232 } 233 234 // Allocate inode bitmap 235 if(!ext2_allocate_inode_bitmap(Ext2Sys)) 236 { 237 goto cleanup; 238 } 239 240 // Allocate gourp desc 241 if(!ext2_allocate_group_desc(Ext2Sys)) 242 { 243 goto cleanup; 244 } 245 246 /* 247 * Reserve the superblock and group descriptors for each 248 * group, and fill in the correct group statistics for group. 249 * Note that although the block bitmap, inode bitmap, and 250 * inode table have not been allocated (and in fact won't be 251 * by this routine), they are accounted for nevertheless. 252 */ 253 group_block = pExt2Sb->s_first_data_block; 254 numblocks = 0; 255 256 pExt2Sb->s_free_blocks_count = 0; 257 258 for (i = 0; i < Ext2Sys->group_desc_count; i++) 259 { 260 if (i == Ext2Sys->group_desc_count-1) 261 { 262 numblocks = (pExt2Sb->s_blocks_count - pExt2Sb->s_first_data_block) 263 % pExt2Sb->s_blocks_per_group; 264 265 if (!numblocks) 266 numblocks = pExt2Sb->s_blocks_per_group; 267 } 268 else 269 { 270 numblocks = pExt2Sb->s_blocks_per_group; 271 } 272 273 if (ext2_bg_has_super(pExt2Sb, i)) 274 { 275 ULONG j; 276 277 for (j=0; j < Ext2Sys->desc_blocks+1; j++) 278 ext2_mark_bitmap(Ext2Sys->block_map, group_block + j); 279 280 numblocks -= 1 + Ext2Sys->desc_blocks; 281 } 282 283 numblocks -= 2 + Ext2Sys->inode_blocks_per_group; 284 285 pExt2Sb->s_free_blocks_count += numblocks; 286 Ext2Sys->group_desc[i].bg_free_blocks_count = (__u16)numblocks; 287 Ext2Sys->group_desc[i].bg_free_inodes_count = (__u16)pExt2Sb->s_inodes_per_group; 288 Ext2Sys->group_desc[i].bg_used_dirs_count = 0; 289 290 group_block += pExt2Sb->s_blocks_per_group; 291 } 292 293 return true; 294 295 cleanup: 296 297 ext2_free_group_desc(Ext2Sys); 298 ext2_free_block_bitmap(Ext2Sys); 299 ext2_free_inode_bitmap(Ext2Sys); 300 301 return false; 302 } 303