make_ext4fs.c revision 881cca2f88ddcce86483b3ba95546b5641de8c0e
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#define _GNU_SOURCE 18 19#include <dirent.h> 20#include <libgen.h> 21#include <stdio.h> 22#include <stdlib.h> 23#include <string.h> 24#include <unistd.h> 25#include <sys/stat.h> 26#include <sys/types.h> 27 28#include "make_ext4fs.h" 29#include "output_file.h" 30#include "ext4_utils.h" 31#include "allocate.h" 32#include "contents.h" 33#include "uuid.h" 34 35#ifdef ANDROID 36#include <private/android_filesystem_config.h> 37#endif 38 39/* TODO: Not implemented: 40 Allocating blocks in the same block group as the file inode 41 Hash or binary tree directories 42 Special files: sockets, devices, fifos 43 */ 44 45static int filter_dot(const struct dirent *d) 46{ 47 return (strcmp(d->d_name, "..") && strcmp(d->d_name, ".")); 48} 49 50static u32 build_default_directory_structure() 51{ 52 u32 inode; 53 u32 root_inode; 54 struct dentry dentries = { 55 .filename = "lost+found", 56 .file_type = EXT4_FT_DIR, 57 .mode = S_IRWXU, 58 .uid = 0, 59 .gid = 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 65 return root_inode; 66} 67 68/* Read a local directory and create the same tree in the generated filesystem. 69 Calls itself recursively with each directory in the given directory */ 70static u32 build_directory_structure(const char *full_path, const char *dir_path, 71 u32 dir_inode, int android) 72{ 73 int entries = 0; 74 struct dentry *dentries; 75 struct dirent **namelist; 76 struct stat stat; 77 int ret; 78 int i; 79 u32 inode; 80 u32 entry_inode; 81 u32 dirs = 0; 82 83 entries = scandir(full_path, &namelist, filter_dot, (void*)alphasort); 84 if (entries < 0) { 85 error_errno("scandir"); 86 return EXT4_ALLOCATE_FAILED; 87 } 88 89 dentries = calloc(entries, sizeof(struct dentry)); 90 if (dentries == NULL) 91 critical_error_errno("malloc"); 92 93 for (i = 0; i < entries; i++) { 94 dentries[i].filename = strdup(namelist[i]->d_name); 95 if (dentries[i].filename == NULL) 96 critical_error_errno("strdup"); 97 98 asprintf(&dentries[i].path, "%s/%s", dir_path, namelist[i]->d_name); 99 asprintf(&dentries[i].full_path, "%s/%s", full_path, namelist[i]->d_name); 100 101 free(namelist[i]); 102 103 ret = lstat(dentries[i].full_path, &stat); 104 if (ret < 0) { 105 error_errno("lstat"); 106 i--; 107 entries--; 108 continue; 109 } 110 111 dentries[i].size = stat.st_size; 112 dentries[i].mode = stat.st_mode & (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO); 113 if (android) { 114#ifdef ANDROID 115 unsigned int mode = 0; 116 unsigned int uid = 0; 117 unsigned int gid = 0; 118 int dir = S_ISDIR(stat.st_mode); 119 fs_config(dentries[i].path, dir, &uid, &gid, &mode); 120 dentries[i].mode = mode; 121 dentries[i].uid = uid; 122 dentries[i].gid = gid; 123#else 124 error("can't set android permissions - built without android support"); 125#endif 126 } 127 128 if (S_ISREG(stat.st_mode)) { 129 dentries[i].file_type = EXT4_FT_REG_FILE; 130 } else if (S_ISDIR(stat.st_mode)) { 131 dentries[i].file_type = EXT4_FT_DIR; 132 dirs++; 133 } else if (S_ISCHR(stat.st_mode)) { 134 dentries[i].file_type = EXT4_FT_CHRDEV; 135 } else if (S_ISBLK(stat.st_mode)) { 136 dentries[i].file_type = EXT4_FT_BLKDEV; 137 } else if (S_ISFIFO(stat.st_mode)) { 138 dentries[i].file_type = EXT4_FT_FIFO; 139 } else if (S_ISSOCK(stat.st_mode)) { 140 dentries[i].file_type = EXT4_FT_SOCK; 141 } else if (S_ISLNK(stat.st_mode)) { 142 dentries[i].file_type = EXT4_FT_SYMLINK; 143 dentries[i].link = calloc(info.block_size, 1); 144 readlink(dentries[i].full_path, dentries[i].link, info.block_size - 1); 145 } else { 146 error("unknown file type on %s", dentries[i].path); 147 i--; 148 entries--; 149 } 150 } 151 free(namelist); 152 153 inode = make_directory(dir_inode, entries, dentries, dirs); 154 155 for (i = 0; i < entries; i++) { 156 if (dentries[i].file_type == EXT4_FT_REG_FILE) { 157 entry_inode = make_file(dentries[i].full_path, dentries[i].size); 158 } else if (dentries[i].file_type == EXT4_FT_DIR) { 159 entry_inode = build_directory_structure(dentries[i].full_path, 160 dentries[i].path, inode, android); 161 } else if (dentries[i].file_type == EXT4_FT_SYMLINK) { 162 entry_inode = make_link(dentries[i].full_path, dentries[i].link); 163 } else { 164 error("unknown file type on %s", dentries[i].path); 165 entry_inode = 0; 166 } 167 *dentries[i].inode = entry_inode; 168 169 ret = inode_set_permissions(entry_inode, dentries[i].mode, 170 dentries[i].uid, dentries[i].gid); 171 if (ret) 172 error("failed to set permissions on %s\n", dentries[i].path); 173 174 free(dentries[i].path); 175 free(dentries[i].full_path); 176 free(dentries[i].link); 177 free((void *)dentries[i].filename); 178 } 179 180 free(dentries); 181 return inode; 182} 183 184static u32 compute_block_size() 185{ 186 return 4096; 187} 188 189static u32 compute_blocks_per_group() 190{ 191 return info.block_size * 8; 192} 193 194static u32 compute_inodes() 195{ 196 return DIV_ROUND_UP(info.len, info.block_size) / 4; 197} 198 199static u32 compute_inodes_per_group() 200{ 201 u32 blocks = DIV_ROUND_UP(info.len, info.block_size); 202 u32 block_groups = DIV_ROUND_UP(blocks, info.blocks_per_group); 203 return DIV_ROUND_UP(info.inodes, block_groups); 204} 205 206static void usage(char *path) 207{ 208 fprintf(stderr, "%s [ -l <len> ] [ -j <journal size> ] [ -b <block_size> ]\n", basename(path)); 209 fprintf(stderr, " [ -g <blocks per group> ] [ -i <inodes> ] [ -I <inode size> ]\n"); 210 fprintf(stderr, " [ -L <label> ] [ -f ] [ -a <android mountpoint> ]\n"); 211 fprintf(stderr, " <filename> [<directory>]\n"); 212} 213 214int main(int argc, char **argv) 215{ 216 int opt; 217 const char *filename = NULL; 218 const char *directory = NULL; 219 char *mountpoint = ""; 220 int android = 0; 221 int gzip = 0; 222 u32 root_inode_num; 223 u16 root_mode; 224 225 while ((opt = getopt(argc, argv, "l:j:b:g:i:I:L:a:fz")) != -1) { 226 switch (opt) { 227 case 'l': 228 info.len = parse_num(optarg); 229 break; 230 case 'j': 231 info.journal_blocks = parse_num(optarg); 232 break; 233 case 'b': 234 info.block_size = parse_num(optarg); 235 break; 236 case 'g': 237 info.blocks_per_group = parse_num(optarg); 238 break; 239 case 'i': 240 info.inodes = parse_num(optarg); 241 break; 242 case 'I': 243 info.inode_size = parse_num(optarg); 244 break; 245 case 'L': 246 info.label = optarg; 247 break; 248 case 'f': 249 force = 1; 250 break; 251 case 'a': 252 android = 1; 253 mountpoint = optarg; 254 break; 255 case 'z': 256 gzip = 1; 257 break; 258 default: /* '?' */ 259 usage(argv[0]); 260 exit(EXIT_FAILURE); 261 } 262 } 263 264 if (optind >= argc) { 265 fprintf(stderr, "Expected filename after options\n"); 266 usage(argv[0]); 267 exit(EXIT_FAILURE); 268 } 269 270 filename = argv[optind++]; 271 272 if (optind < argc) 273 directory = argv[optind++]; 274 275 if (optind < argc) { 276 fprintf(stderr, "Unexpected argument: %s\n", argv[optind]); 277 usage(argv[0]); 278 exit(EXIT_FAILURE); 279 } 280 281 if (info.len == 0) 282 info.len = get_file_size(filename); 283 284 if (info.len <= 0) { 285 fprintf(stderr, "Need size of filesystem\n"); 286 usage(argv[0]); 287 exit(EXIT_FAILURE); 288 } 289 290 if (info.journal_blocks > 0) 291 info.feat_compat = EXT4_FEATURE_COMPAT_HAS_JOURNAL; 292 293 if (info.block_size <= 0) 294 info.block_size = compute_block_size(); 295 296 if (info.blocks_per_group <= 0) 297 info.blocks_per_group = compute_blocks_per_group(); 298 299 if (info.inodes <= 0) 300 info.inodes = compute_inodes(); 301 302 if (info.inode_size <= 0) 303 info.inode_size = 256; 304 305 if (info.label == NULL) 306 info.label = ""; 307 308 info.inodes_per_group = compute_inodes_per_group(); 309 310 info.feat_compat |= 311 EXT4_FEATURE_COMPAT_RESIZE_INODE; 312 313 info.feat_ro_compat |= 314 EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | 315 EXT4_FEATURE_RO_COMPAT_LARGE_FILE; 316 317 info.feat_incompat |= 318 EXT4_FEATURE_INCOMPAT_EXTENTS | 319 EXT4_FEATURE_INCOMPAT_FILETYPE; 320 321 322 printf("Creating filesystem with parameters:\n"); 323 printf(" Size: %llu\n", info.len); 324 printf(" Block size: %d\n", info.block_size); 325 printf(" Blocks per group: %d\n", info.blocks_per_group); 326 printf(" Inodes per group: %d\n", info.inodes_per_group); 327 printf(" Inode size: %d\n", info.inode_size); 328 printf(" Label: %s\n", info.label); 329 330 ext4_create_fs_aux_info(); 331 332 printf(" Blocks: %llu\n", aux_info.len_blocks); 333 printf(" Block groups: %d\n", aux_info.groups); 334 printf(" Reserved block group size: %d\n", aux_info.bg_desc_reserve_blocks); 335 336 block_allocator_init(); 337 338 ext4_fill_in_sb(); 339 340 if (reserve_inodes(0, 10) == EXT4_ALLOCATE_FAILED) 341 error("failed to reserve first 10 inodes"); 342 343 if (info.feat_compat & EXT4_FEATURE_COMPAT_HAS_JOURNAL) 344 ext4_create_journal_inode(); 345 346 if (info.feat_compat & EXT4_FEATURE_COMPAT_RESIZE_INODE) 347 ext4_create_resize_inode(); 348 349 if (directory) 350 root_inode_num = build_directory_structure(directory, mountpoint, 0, android); 351 else 352 root_inode_num = build_default_directory_structure(); 353 354 root_mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH; 355 inode_set_permissions(root_inode_num, root_mode, 0, 0); 356 357 ext4_update_free(); 358 359 printf("Created filesystem with %d/%d inodes and %d/%d blocks\n", 360 aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count, 361 aux_info.sb->s_inodes_count, 362 aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo, 363 aux_info.sb->s_blocks_count_lo); 364 365 write_ext4_image(filename, gzip); 366 367 return 0; 368} 369