make_ext4fs.c revision dc5abeee1e6fc4827ee0d5ece12aaed2dd56f4c7
116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood/* 216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * Copyright (C) 2010 The Android Open Source Project 316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * 416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * Licensed under the Apache License, Version 2.0 (the "License"); 516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * you may not use this file except in compliance with the License. 616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * You may obtain a copy of the License at 716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * 816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * http://www.apache.org/licenses/LICENSE-2.0 916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * 1016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * Unless required by applicable law or agreed to in writing, software 1116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * distributed under the License is distributed on an "AS IS" BASIS, 1216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * See the License for the specific language governing permissions and 1416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood * limitations under the License. 1516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood */ 1616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 17b14e588bec4d5e39e61b020b5b575f2ce555d316Mike Lockwood#include "make_ext4fs.h" 18b14e588bec4d5e39e61b020b5b575f2ce555d316Mike Lockwood#include "ext4_utils.h" 1916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include "allocate.h" 2016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include "contents.h" 2116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include "uuid.h" 2216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include "wipe.h" 2316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 247850ef999740f214a1990a9c090d3f3865d435aaMike Lockwood#include <sparse/sparse.h> 2516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 2616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <assert.h> 2716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <dirent.h> 2816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <fcntl.h> 2916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <libgen.h> 3016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <stdio.h> 3116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <stdlib.h> 3216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <string.h> 3316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <unistd.h> 3416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <sys/stat.h> 3516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <sys/types.h> 3616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 3716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#ifdef USE_MINGW 3816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 3916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#include <winsock2.h> 40dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood 41dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood/* These match the Linux definitions of these flags. 42dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood L_xx is defined to avoid conflicting with the win32 versions. 43dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood*/ 44dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood#define L_S_IRUSR 00400 45dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood#define L_S_IWUSR 00200 46dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood#define L_S_IXUSR 00100 4716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_IRWXU (L_S_IRUSR | L_S_IWUSR | L_S_IXUSR) 4816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_IRGRP 00040 4916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_IWGRP 00020 5016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_IXGRP 00010 5116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_IRWXG (S_IRGRP | S_IWGRP | S_IXGRP) 5216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_IROTH 00004 5316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_IWOTH 00002 5416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_IXOTH 00001 5516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_IRWXO (S_IROTH | S_IWOTH | S_IXOTH) 5616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_ISUID 0004000 5716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_ISGID 0002000 5816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define S_ISVTX 0001000 5916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 6016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#else 6116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 6216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#define O_BINARY 0 6316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 6416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#endif 6516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 6616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood/* TODO: Not implemented: 6716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood Allocating blocks in the same block group as the file inode 6816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood Hash or binary tree directories 6916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood Special files: sockets, devices, fifos 7016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood */ 7116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 7216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwoodstatic int filter_dot(const struct dirent *d) 7316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood{ 7416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood return (strcmp(d->d_name, "..") && strcmp(d->d_name, ".")); 7516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood} 7616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 7716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwoodstatic u32 build_default_directory_structure() 7816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood{ 7916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood u32 inode; 8016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood u32 root_inode; 8116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood struct dentry dentries = { 8216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood .filename = "lost+found", 8316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood .file_type = EXT4_FT_DIR, 8416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood .mode = S_IRWXU, 8516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood .uid = 0, 8616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood .gid = 0, 8716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood .mtime = 0, 8816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood }; 8916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood root_inode = make_directory(0, 1, &dentries, 1); 9016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood inode = make_directory(root_inode, 0, NULL, 0); 9116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood *dentries.inode = inode; 9216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood inode_set_permissions(inode, dentries.mode, 9316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood dentries.uid, dentries.gid, dentries.mtime); 9416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 9516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood return root_inode; 9616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood} 9716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 98dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood#ifndef USE_MINGW 99dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood/* Read a local directory and create the same tree in the generated filesystem. 100dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood Calls itself recursively with each directory in the given directory */ 101dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwoodstatic u32 build_directory_structure(const char *full_path, const char *dir_path, 102dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood u32 dir_inode, fs_config_func_t fs_config_func, 103dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood struct selabel_handle *sehnd) 104dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood{ 105dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood int entries = 0; 106dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood struct dentry *dentries; 107dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood struct dirent **namelist; 108dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood struct stat stat; 109dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood int ret; 110dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood int i; 111dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood u32 inode; 112dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood u32 entry_inode; 113dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood u32 dirs = 0; 114dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood 115dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood entries = scandir(full_path, &namelist, filter_dot, (void*)alphasort); 116dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood if (entries < 0) { 117dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood error_errno("scandir"); 118dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood return EXT4_ALLOCATE_FAILED; 119dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood } 120dde372033b4da75ebde7ea2afdec1c1b86ab5a42Mike Lockwood 12116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood dentries = calloc(entries, sizeof(struct dentry)); 12216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood if (dentries == NULL) 12316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood critical_error_errno("malloc"); 12416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 12516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood for (i = 0; i < entries; i++) { 12616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood dentries[i].filename = strdup(namelist[i]->d_name); 12716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood if (dentries[i].filename == NULL) 12816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood critical_error_errno("strdup"); 12916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 13016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood asprintf(&dentries[i].path, "%s/%s", dir_path, namelist[i]->d_name); 13116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood asprintf(&dentries[i].full_path, "%s/%s", full_path, namelist[i]->d_name); 13216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 13316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood free(namelist[i]); 13416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 13516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood ret = lstat(dentries[i].full_path, &stat); 13616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood if (ret < 0) { 13716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood error_errno("lstat"); 13816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood i--; 13916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood entries--; 14016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood continue; 14116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood } 14216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood 14316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood dentries[i].size = stat.st_size; 14416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood dentries[i].mode = stat.st_mode & (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO); 145de1e37aad04640ef76f3c017b65adca087c7be0fMike Lockwood dentries[i].mtime = stat.st_mtime; 14616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood if (fs_config_func != NULL) { 14716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#ifdef ANDROID 14816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood unsigned int mode = 0; 14916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood unsigned int uid = 0; 15016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood unsigned int gid = 0; 15116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood int dir = S_ISDIR(stat.st_mode); 15216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood fs_config_func(dentries[i].path, dir, &uid, &gid, &mode); 15316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood dentries[i].mode = mode; 15416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood dentries[i].uid = uid; 15516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood dentries[i].gid = gid; 15616864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#else 15716864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood error("can't set android permissions - built without android support"); 15816864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#endif 15916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood } 16016864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood#ifdef HAVE_SELINUX 16116864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood if (sehnd) { 16216864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood char *sepath = NULL; 16316864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood asprintf(&sepath, "/%s", dentries[i].path); 16416864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood if (selabel_lookup(sehnd, &dentries[i].secon, sepath, stat.st_mode) < 0) { 16516864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood error("cannot lookup security context for %s", sepath); 166de1e37aad04640ef76f3c017b65adca087c7be0fMike Lockwood } 167de1e37aad04640ef76f3c017b65adca087c7be0fMike Lockwood if (dentries[i].secon) 168de1e37aad04640ef76f3c017b65adca087c7be0fMike Lockwood printf("Labeling %s as %s\n", sepath, dentries[i].secon); 16916864bae0f51c32c456da2c43adf7a057c0c4882Mike Lockwood free(sepath); 1707850ef999740f214a1990a9c090d3f3865d435aaMike Lockwood } 1717850ef999740f214a1990a9c090d3f3865d435aaMike Lockwood#endif 172 173 if (S_ISREG(stat.st_mode)) { 174 dentries[i].file_type = EXT4_FT_REG_FILE; 175 } else if (S_ISDIR(stat.st_mode)) { 176 dentries[i].file_type = EXT4_FT_DIR; 177 dirs++; 178 } else if (S_ISCHR(stat.st_mode)) { 179 dentries[i].file_type = EXT4_FT_CHRDEV; 180 } else if (S_ISBLK(stat.st_mode)) { 181 dentries[i].file_type = EXT4_FT_BLKDEV; 182 } else if (S_ISFIFO(stat.st_mode)) { 183 dentries[i].file_type = EXT4_FT_FIFO; 184 } else if (S_ISSOCK(stat.st_mode)) { 185 dentries[i].file_type = EXT4_FT_SOCK; 186 } else if (S_ISLNK(stat.st_mode)) { 187 dentries[i].file_type = EXT4_FT_SYMLINK; 188 dentries[i].link = calloc(info.block_size, 1); 189 readlink(dentries[i].full_path, dentries[i].link, info.block_size - 1); 190 } else { 191 error("unknown file type on %s", dentries[i].path); 192 i--; 193 entries--; 194 } 195 } 196 free(namelist); 197 198 inode = make_directory(dir_inode, entries, dentries, dirs); 199 200 for (i = 0; i < entries; i++) { 201 if (dentries[i].file_type == EXT4_FT_REG_FILE) { 202 entry_inode = make_file(dentries[i].full_path, dentries[i].size); 203 } else if (dentries[i].file_type == EXT4_FT_DIR) { 204 entry_inode = build_directory_structure(dentries[i].full_path, 205 dentries[i].path, inode, fs_config_func, sehnd); 206 } else if (dentries[i].file_type == EXT4_FT_SYMLINK) { 207 entry_inode = make_link(dentries[i].full_path, dentries[i].link); 208 } else { 209 error("unknown file type on %s", dentries[i].path); 210 entry_inode = 0; 211 } 212 *dentries[i].inode = entry_inode; 213 214 ret = inode_set_permissions(entry_inode, dentries[i].mode, 215 dentries[i].uid, dentries[i].gid, 216 dentries[i].mtime); 217 if (ret) 218 error("failed to set permissions on %s\n", dentries[i].path); 219 ret = inode_set_selinux(entry_inode, dentries[i].secon); 220 if (ret) 221 error("failed to set SELinux context on %s\n", dentries[i].path); 222 223 free(dentries[i].path); 224 free(dentries[i].full_path); 225 free(dentries[i].link); 226 free((void *)dentries[i].filename); 227 free(dentries[i].secon); 228 } 229 230 free(dentries); 231 return inode; 232} 233#endif 234 235static u32 compute_block_size() 236{ 237 return 4096; 238} 239 240static u32 compute_journal_blocks() 241{ 242 u32 journal_blocks = DIV_ROUND_UP(info.len, info.block_size) / 64; 243 if (journal_blocks < 1024) 244 journal_blocks = 1024; 245 if (journal_blocks > 32768) 246 journal_blocks = 32768; 247 return journal_blocks; 248} 249 250static u32 compute_blocks_per_group() 251{ 252 return info.block_size * 8; 253} 254 255static u32 compute_inodes() 256{ 257 return DIV_ROUND_UP(info.len, info.block_size) / 4; 258} 259 260static u32 compute_inodes_per_group() 261{ 262 u32 blocks = DIV_ROUND_UP(info.len, info.block_size); 263 u32 block_groups = DIV_ROUND_UP(blocks, info.blocks_per_group); 264 u32 inodes = DIV_ROUND_UP(info.inodes, block_groups); 265 inodes = ALIGN(inodes, (info.block_size / info.inode_size)); 266 267 /* After properly rounding up the number of inodes/group, 268 * make sure to update the total inodes field in the info struct. 269 */ 270 info.inodes = inodes * block_groups; 271 272 return inodes; 273} 274 275static u32 compute_bg_desc_reserve_blocks() 276{ 277 u32 blocks = DIV_ROUND_UP(info.len, info.block_size); 278 u32 block_groups = DIV_ROUND_UP(blocks, info.blocks_per_group); 279 u32 bg_desc_blocks = DIV_ROUND_UP(block_groups * sizeof(struct ext2_group_desc), 280 info.block_size); 281 282 u32 bg_desc_reserve_blocks = 283 DIV_ROUND_UP(block_groups * 1024 * sizeof(struct ext2_group_desc), 284 info.block_size) - bg_desc_blocks; 285 286 if (bg_desc_reserve_blocks > info.block_size / sizeof(u32)) 287 bg_desc_reserve_blocks = info.block_size / sizeof(u32); 288 289 return bg_desc_reserve_blocks; 290} 291 292void reset_ext4fs_info() { 293 // Reset all the global data structures used by make_ext4fs so it 294 // can be called again. 295 memset(&info, 0, sizeof(info)); 296 memset(&aux_info, 0, sizeof(aux_info)); 297 free_data_blocks(); 298} 299 300int make_ext4fs(const char *filename, s64 len, 301 const char *mountpoint, struct selabel_handle *sehnd) 302{ 303 int fd; 304 int status; 305 306 reset_ext4fs_info(); 307 info.len = len; 308 309 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); 310 if (fd < 0) { 311 error_errno("open"); 312 return EXIT_FAILURE; 313 } 314 315 status = make_ext4fs_internal(fd, NULL, mountpoint, NULL, 0, 0, 0, 1, 0, sehnd); 316 close(fd); 317 318 return status; 319} 320 321int make_ext4fs_internal(int fd, const char *directory, 322 char *mountpoint, fs_config_func_t fs_config_func, int gzip, int sparse, 323 int crc, int wipe, int init_itabs, struct selabel_handle *sehnd) 324{ 325 u32 root_inode_num; 326 u16 root_mode; 327 328 if (setjmp(setjmp_env)) 329 return EXIT_FAILURE; /* Handle a call to longjmp() */ 330 331 if (info.len <= 0) 332 info.len = get_file_size(fd); 333 334 if (info.len <= 0) { 335 fprintf(stderr, "Need size of filesystem\n"); 336 return EXIT_FAILURE; 337 } 338 339 if (info.block_size <= 0) 340 info.block_size = compute_block_size(); 341 342 /* Round down the filesystem length to be a multiple of the block size */ 343 info.len &= ~((u64)info.block_size - 1); 344 345 if (info.journal_blocks == 0) 346 info.journal_blocks = compute_journal_blocks(); 347 348 if (info.no_journal == 0) 349 info.feat_compat = EXT4_FEATURE_COMPAT_HAS_JOURNAL; 350 else 351 info.journal_blocks = 0; 352 353 if (info.blocks_per_group <= 0) 354 info.blocks_per_group = compute_blocks_per_group(); 355 356 if (info.inodes <= 0) 357 info.inodes = compute_inodes(); 358 359 if (info.inode_size <= 0) 360 info.inode_size = 256; 361 362 if (info.label == NULL) 363 info.label = ""; 364 365 info.inodes_per_group = compute_inodes_per_group(); 366 367 info.feat_compat |= 368 EXT4_FEATURE_COMPAT_RESIZE_INODE; 369 370 info.feat_ro_compat |= 371 EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | 372 EXT4_FEATURE_RO_COMPAT_LARGE_FILE; 373 374 info.feat_incompat |= 375 EXT4_FEATURE_INCOMPAT_EXTENTS | 376 EXT4_FEATURE_INCOMPAT_FILETYPE; 377 378 379 info.bg_desc_reserve_blocks = compute_bg_desc_reserve_blocks(); 380 381 printf("Creating filesystem with parameters:\n"); 382 printf(" Size: %llu\n", info.len); 383 printf(" Block size: %d\n", info.block_size); 384 printf(" Blocks per group: %d\n", info.blocks_per_group); 385 printf(" Inodes per group: %d\n", info.inodes_per_group); 386 printf(" Inode size: %d\n", info.inode_size); 387 printf(" Journal blocks: %d\n", info.journal_blocks); 388 printf(" Label: %s\n", info.label); 389 390 ext4_create_fs_aux_info(); 391 392 printf(" Blocks: %llu\n", aux_info.len_blocks); 393 printf(" Block groups: %d\n", aux_info.groups); 394 printf(" Reserved block group size: %d\n", info.bg_desc_reserve_blocks); 395 396 block_allocator_init(); 397 398 ext4_fill_in_sb(); 399 400 if (reserve_inodes(0, 10) == EXT4_ALLOCATE_FAILED) 401 error("failed to reserve first 10 inodes"); 402 403 if (info.feat_compat & EXT4_FEATURE_COMPAT_HAS_JOURNAL) 404 ext4_create_journal_inode(); 405 406 if (info.feat_compat & EXT4_FEATURE_COMPAT_RESIZE_INODE) 407 ext4_create_resize_inode(); 408 409#ifdef USE_MINGW 410 // Windows needs only 'create an empty fs image' functionality 411 assert(!directory); 412 root_inode_num = build_default_directory_structure(); 413#else 414 if (directory) 415 root_inode_num = build_directory_structure(directory, mountpoint, 0, 416 fs_config_func, sehnd); 417 else 418 root_inode_num = build_default_directory_structure(); 419#endif 420 421 root_mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH; 422 inode_set_permissions(root_inode_num, root_mode, 0, 0, 0); 423 424#ifdef HAVE_SELINUX 425 if (sehnd) { 426 char *sepath = NULL; 427 char *secontext = NULL; 428 429 if (mountpoint[0] == '/') 430 sepath = strdup(mountpoint); 431 else 432 asprintf(&sepath, "/%s", mountpoint); 433 if (!sepath) 434 critical_error_errno("malloc"); 435 if (selabel_lookup(sehnd, &secontext, sepath, S_IFDIR) < 0) { 436 error("cannot lookup security context for %s", sepath); 437 } 438 if (secontext) { 439 printf("Labeling %s as %s\n", sepath, secontext); 440 inode_set_selinux(root_inode_num, secontext); 441 } 442 free(sepath); 443 freecon(secontext); 444 } 445#endif 446 447 ext4_update_free(); 448 449 if (init_itabs) 450 init_unused_inode_tables(); 451 452 ext4_queue_sb(); 453 454 printf("Created filesystem with %d/%d inodes and %d/%d blocks\n", 455 aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count, 456 aux_info.sb->s_inodes_count, 457 aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo, 458 aux_info.sb->s_blocks_count_lo); 459 460 if (wipe) 461 wipe_block_device(fd, info.len); 462 463 write_ext4_image(fd, gzip, sparse, crc); 464 465 return 0; 466} 467