1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "make_ext4fs.h" 18 #include "output_file.h" 19 #include "ext4_utils.h" 20 #include "allocate.h" 21 #include "contents.h" 22 #include "uuid.h" 23 #include "backed_block.h" 24 25 #include <dirent.h> 26 #include <libgen.h> 27 #include <stdio.h> 28 #include <stdlib.h> 29 #include <string.h> 30 #include <unistd.h> 31 #include <sys/stat.h> 32 #include <sys/types.h> 33 34 #ifdef ANDROID 35 #include <private/android_filesystem_config.h> 36 #endif 37 38 /* TODO: Not implemented: 39 Allocating blocks in the same block group as the file inode 40 Hash or binary tree directories 41 Special files: sockets, devices, fifos 42 */ 43 44 static int filter_dot(const struct dirent *d) 45 { 46 return (strcmp(d->d_name, "..") && strcmp(d->d_name, ".")); 47 } 48 49 static u32 build_default_directory_structure() 50 { 51 u32 inode; 52 u32 root_inode; 53 struct dentry dentries = { 54 .filename = "lost+found", 55 .file_type = EXT4_FT_DIR, 56 .mode = S_IRWXU, 57 .uid = 0, 58 .gid = 0, 59 .mtime = 0, 60 }; 61 root_inode = make_directory(0, 1, &dentries, 1); 62 inode = make_directory(root_inode, 0, NULL, 0); 63 *dentries.inode = inode; 64 inode_set_permissions(inode, dentries.mode, 65 dentries.uid, dentries.gid, dentries.mtime); 66 67 return root_inode; 68 } 69 70 /* Read a local directory and create the same tree in the generated filesystem. 71 Calls itself recursively with each directory in the given directory */ 72 static u32 build_directory_structure(const char *full_path, const char *dir_path, 73 u32 dir_inode, int android) 74 { 75 int entries = 0; 76 struct dentry *dentries; 77 struct dirent **namelist; 78 struct stat stat; 79 int ret; 80 int i; 81 u32 inode; 82 u32 entry_inode; 83 u32 dirs = 0; 84 85 entries = scandir(full_path, &namelist, filter_dot, (void*)alphasort); 86 if (entries < 0) { 87 error_errno("scandir"); 88 return EXT4_ALLOCATE_FAILED; 89 } 90 91 dentries = calloc(entries, sizeof(struct dentry)); 92 if (dentries == NULL) 93 critical_error_errno("malloc"); 94 95 for (i = 0; i < entries; i++) { 96 dentries[i].filename = strdup(namelist[i]->d_name); 97 if (dentries[i].filename == NULL) 98 critical_error_errno("strdup"); 99 100 asprintf(&dentries[i].path, "%s/%s", dir_path, namelist[i]->d_name); 101 asprintf(&dentries[i].full_path, "%s/%s", full_path, namelist[i]->d_name); 102 103 free(namelist[i]); 104 105 ret = lstat(dentries[i].full_path, &stat); 106 if (ret < 0) { 107 error_errno("lstat"); 108 i--; 109 entries--; 110 continue; 111 } 112 113 dentries[i].size = stat.st_size; 114 dentries[i].mode = stat.st_mode & (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO); 115 dentries[i].mtime = stat.st_mtime; 116 if (android) { 117 #ifdef ANDROID 118 unsigned int mode = 0; 119 unsigned int uid = 0; 120 unsigned int gid = 0; 121 int dir = S_ISDIR(stat.st_mode); 122 fs_config(dentries[i].path, dir, &uid, &gid, &mode); 123 dentries[i].mode = mode; 124 dentries[i].uid = uid; 125 dentries[i].gid = gid; 126 #else 127 error("can't set android permissions - built without android support"); 128 #endif 129 } 130 131 if (S_ISREG(stat.st_mode)) { 132 dentries[i].file_type = EXT4_FT_REG_FILE; 133 } else if (S_ISDIR(stat.st_mode)) { 134 dentries[i].file_type = EXT4_FT_DIR; 135 dirs++; 136 } else if (S_ISCHR(stat.st_mode)) { 137 dentries[i].file_type = EXT4_FT_CHRDEV; 138 } else if (S_ISBLK(stat.st_mode)) { 139 dentries[i].file_type = EXT4_FT_BLKDEV; 140 } else if (S_ISFIFO(stat.st_mode)) { 141 dentries[i].file_type = EXT4_FT_FIFO; 142 } else if (S_ISSOCK(stat.st_mode)) { 143 dentries[i].file_type = EXT4_FT_SOCK; 144 } else if (S_ISLNK(stat.st_mode)) { 145 dentries[i].file_type = EXT4_FT_SYMLINK; 146 dentries[i].link = calloc(info.block_size, 1); 147 readlink(dentries[i].full_path, dentries[i].link, info.block_size - 1); 148 } else { 149 error("unknown file type on %s", dentries[i].path); 150 i--; 151 entries--; 152 } 153 } 154 free(namelist); 155 156 inode = make_directory(dir_inode, entries, dentries, dirs); 157 158 for (i = 0; i < entries; i++) { 159 if (dentries[i].file_type == EXT4_FT_REG_FILE) { 160 entry_inode = make_file(dentries[i].full_path, dentries[i].size); 161 } else if (dentries[i].file_type == EXT4_FT_DIR) { 162 entry_inode = build_directory_structure(dentries[i].full_path, 163 dentries[i].path, inode, android); 164 } else if (dentries[i].file_type == EXT4_FT_SYMLINK) { 165 entry_inode = make_link(dentries[i].full_path, dentries[i].link); 166 } else { 167 error("unknown file type on %s", dentries[i].path); 168 entry_inode = 0; 169 } 170 *dentries[i].inode = entry_inode; 171 172 ret = inode_set_permissions(entry_inode, dentries[i].mode, 173 dentries[i].uid, dentries[i].gid, 174 dentries[i].mtime); 175 if (ret) 176 error("failed to set permissions on %s\n", dentries[i].path); 177 178 free(dentries[i].path); 179 free(dentries[i].full_path); 180 free(dentries[i].link); 181 free((void *)dentries[i].filename); 182 } 183 184 free(dentries); 185 return inode; 186 } 187 188 static u32 compute_block_size() 189 { 190 return 4096; 191 } 192 193 static u32 compute_journal_blocks() 194 { 195 u32 journal_blocks = DIV_ROUND_UP(info.len, info.block_size) / 64; 196 if (journal_blocks < 1024) 197 journal_blocks = 1024; 198 if (journal_blocks > 32768) 199 journal_blocks = 32768; 200 return journal_blocks; 201 } 202 203 static u32 compute_blocks_per_group() 204 { 205 return info.block_size * 8; 206 } 207 208 static u32 compute_inodes() 209 { 210 return DIV_ROUND_UP(info.len, info.block_size) / 4; 211 } 212 213 static u32 compute_inodes_per_group() 214 { 215 u32 blocks = DIV_ROUND_UP(info.len, info.block_size); 216 u32 block_groups = DIV_ROUND_UP(blocks, info.blocks_per_group); 217 u32 inodes = DIV_ROUND_UP(info.inodes, block_groups); 218 inodes = ALIGN(inodes, (info.block_size / info.inode_size)); 219 220 /* After properly rounding up the number of inodes/group, 221 * make sure to update the total inodes field in the info struct. 222 */ 223 info.inodes = inodes * block_groups; 224 225 return inodes; 226 } 227 228 static u32 compute_bg_desc_reserve_blocks() 229 { 230 u32 blocks = DIV_ROUND_UP(info.len, info.block_size); 231 u32 block_groups = DIV_ROUND_UP(blocks, info.blocks_per_group); 232 u32 bg_desc_blocks = DIV_ROUND_UP(block_groups * sizeof(struct ext2_group_desc), 233 info.block_size); 234 235 u32 bg_desc_reserve_blocks = 236 DIV_ROUND_UP(block_groups * 1024 * sizeof(struct ext2_group_desc), 237 info.block_size) - bg_desc_blocks; 238 239 if (bg_desc_reserve_blocks > info.block_size / sizeof(u32)) 240 bg_desc_reserve_blocks = info.block_size / sizeof(u32); 241 242 return bg_desc_reserve_blocks; 243 } 244 245 void reset_ext4fs_info() { 246 // Reset all the global data structures used by make_ext4fs so it 247 // can be called again. 248 memset(&info, 0, sizeof(info)); 249 memset(&aux_info, 0, sizeof(aux_info)); 250 free_data_blocks(); 251 } 252 253 int make_ext4fs(const char *filename, s64 len) 254 { 255 reset_ext4fs_info(); 256 info.len = len; 257 return make_ext4fs_internal(filename, NULL, NULL, 0, 0, 0, 0, 1, 0); 258 } 259 260 int make_ext4fs_internal(const char *filename, const char *directory, 261 char *mountpoint, int android, int gzip, int sparse, 262 int crc, int wipe, int init_itabs) 263 { 264 u32 root_inode_num; 265 u16 root_mode; 266 267 if (setjmp(setjmp_env)) 268 return EXIT_FAILURE; /* Handle a call to longjmp() */ 269 270 if (info.len <= 0) 271 info.len = get_file_size(filename); 272 273 if (info.len <= 0) { 274 fprintf(stderr, "Need size of filesystem\n"); 275 return EXIT_FAILURE; 276 } 277 278 if (info.block_size <= 0) 279 info.block_size = compute_block_size(); 280 281 /* Round down the filesystem length to be a multiple of the block size */ 282 info.len &= ~((u64)info.block_size - 1); 283 284 if (info.journal_blocks == 0) 285 info.journal_blocks = compute_journal_blocks(); 286 287 if (info.no_journal == 0) 288 info.feat_compat = EXT4_FEATURE_COMPAT_HAS_JOURNAL; 289 else 290 info.journal_blocks = 0; 291 292 if (info.blocks_per_group <= 0) 293 info.blocks_per_group = compute_blocks_per_group(); 294 295 if (info.inodes <= 0) 296 info.inodes = compute_inodes(); 297 298 if (info.inode_size <= 0) 299 info.inode_size = 256; 300 301 if (info.label == NULL) 302 info.label = ""; 303 304 info.inodes_per_group = compute_inodes_per_group(); 305 306 info.feat_compat |= 307 EXT4_FEATURE_COMPAT_RESIZE_INODE; 308 309 info.feat_ro_compat |= 310 EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | 311 EXT4_FEATURE_RO_COMPAT_LARGE_FILE; 312 313 info.feat_incompat |= 314 EXT4_FEATURE_INCOMPAT_EXTENTS | 315 EXT4_FEATURE_INCOMPAT_FILETYPE; 316 317 318 info.bg_desc_reserve_blocks = compute_bg_desc_reserve_blocks(); 319 320 printf("Creating filesystem with parameters:\n"); 321 printf(" Size: %llu\n", info.len); 322 printf(" Block size: %d\n", info.block_size); 323 printf(" Blocks per group: %d\n", info.blocks_per_group); 324 printf(" Inodes per group: %d\n", info.inodes_per_group); 325 printf(" Inode size: %d\n", info.inode_size); 326 printf(" Journal blocks: %d\n", info.journal_blocks); 327 printf(" Label: %s\n", info.label); 328 329 ext4_create_fs_aux_info(); 330 331 printf(" Blocks: %llu\n", aux_info.len_blocks); 332 printf(" Block groups: %d\n", aux_info.groups); 333 printf(" Reserved block group size: %d\n", info.bg_desc_reserve_blocks); 334 335 block_allocator_init(); 336 337 ext4_fill_in_sb(); 338 339 if (reserve_inodes(0, 10) == EXT4_ALLOCATE_FAILED) 340 error("failed to reserve first 10 inodes"); 341 342 if (info.feat_compat & EXT4_FEATURE_COMPAT_HAS_JOURNAL) 343 ext4_create_journal_inode(); 344 345 if (info.feat_compat & EXT4_FEATURE_COMPAT_RESIZE_INODE) 346 ext4_create_resize_inode(); 347 348 if (directory) 349 root_inode_num = build_directory_structure(directory, mountpoint, 0, android); 350 else 351 root_inode_num = build_default_directory_structure(); 352 353 root_mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH; 354 inode_set_permissions(root_inode_num, root_mode, 0, 0, 0); 355 356 ext4_update_free(); 357 358 if (init_itabs) 359 init_unused_inode_tables(); 360 361 ext4_queue_sb(); 362 363 printf("Created filesystem with %d/%d inodes and %d/%d blocks\n", 364 aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count, 365 aux_info.sb->s_inodes_count, 366 aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo, 367 aux_info.sb->s_blocks_count_lo); 368 369 write_ext4_image(filename, gzip, sparse, crc, wipe); 370 371 return 0; 372 } 373
