| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "ext4_utils/make_ext4fs.h" |
| |
| #ifndef _GNU_SOURCE |
| #define _GNU_SOURCE |
| #endif |
| |
| #include <assert.h> |
| #include <dirent.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <libgen.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include <sparse/sparse.h> |
| |
| #include "allocate.h" |
| #include "contents.h" |
| #include "ext4_utils/ext4_utils.h" |
| #include "ext4_utils/wipe.h" |
| |
| #ifdef _WIN32 |
| |
| #include <winsock2.h> |
| |
| /* These match the Linux definitions of these flags. |
| L_xx is defined to avoid conflicting with the win32 versions. |
| */ |
| #undef S_IRWXU |
| #undef S_IRGRP |
| #undef S_IWGRP |
| #undef S_IXGRP |
| #undef S_IRWXG |
| #undef S_IROTH |
| #undef S_IWOTH |
| #undef S_IXOTH |
| #undef S_IRWXO |
| #undef S_ISUID |
| #undef S_ISGID |
| #undef S_ISVTX |
| |
| #define L_S_IRUSR 00400 |
| #define L_S_IWUSR 00200 |
| #define L_S_IXUSR 00100 |
| #define S_IRWXU (L_S_IRUSR | L_S_IWUSR | L_S_IXUSR) |
| #define S_IRGRP 00040 |
| #define S_IWGRP 00020 |
| #define S_IXGRP 00010 |
| #define S_IRWXG (S_IRGRP | S_IWGRP | S_IXGRP) |
| #define S_IROTH 00004 |
| #define S_IWOTH 00002 |
| #define S_IXOTH 00001 |
| #define S_IRWXO (S_IROTH | S_IWOTH | S_IXOTH) |
| #define S_ISUID 0004000 |
| #define S_ISGID 0002000 |
| #define S_ISVTX 0001000 |
| |
| #else |
| |
| #include <selinux/selinux.h> |
| #include <selinux/label.h> |
| |
| #define O_BINARY 0 |
| |
| #endif |
| |
| #define MAX_PATH 4096 |
| #define MAX_BLK_MAPPING_STR 1000 |
| |
| const int blk_file_major_ver = 1; |
| const int blk_file_minor_ver = 0; |
| const char *blk_file_header_fmt = "Base EXT4 version %d.%d"; |
| |
| /* TODO: Not implemented: |
| Allocating blocks in the same block group as the file inode |
| Hash or binary tree directories |
| Special files: sockets, devices, fifos |
| */ |
| |
| static int filter_dot(const struct dirent *d) |
| { |
| return (strcmp(d->d_name, "..") && strcmp(d->d_name, ".")); |
| } |
| |
| static u32 build_default_directory_structure(const char *dir_path, |
| struct selabel_handle *sehnd) |
| { |
| u32 inode; |
| u32 root_inode; |
| struct dentry dentries = { |
| .filename = "lost+found", |
| .file_type = EXT4_FT_DIR, |
| .mode = S_IRWXU, |
| .uid = 0, |
| .gid = 0, |
| .mtime = 0, |
| }; |
| root_inode = make_directory(0, 1, &dentries, 1); |
| inode = make_directory(root_inode, 0, NULL, 0); |
| *dentries.inode = inode; |
| inode_set_permissions(inode, dentries.mode, |
| dentries.uid, dentries.gid, dentries.mtime); |
| |
| #ifndef _WIN32 |
| if (sehnd) { |
| char *path = NULL; |
| char *secontext = NULL; |
| |
| asprintf(&path, "%slost+found", dir_path); |
| if (selabel_lookup(sehnd, &secontext, path, S_IFDIR) < 0) { |
| error("cannot lookup security context for %s", path); |
| } else { |
| inode_set_selinux(inode, secontext); |
| freecon(secontext); |
| } |
| free(path); |
| } |
| #endif |
| |
| return root_inode; |
| } |
| |
| #ifndef _WIN32 |
| /* Read a local directory and create the same tree in the generated filesystem. |
| Calls itself recursively with each directory in the given directory. |
| full_path is an absolute or relative path, with a trailing slash, to the |
| directory on disk that should be copied, or NULL if this is a directory |
| that does not exist on disk (e.g. lost+found). |
| dir_path is an absolute path, with trailing slash, to the same directory |
| if the image were mounted at the specified mount point */ |
| static u32 build_directory_structure(const char *full_path, const char *dir_path, const char *target_out_path, |
| u32 dir_inode, fs_config_func_t fs_config_func, |
| struct selabel_handle *sehnd, int verbose, time_t fixed_time) |
| { |
| int entries = 0; |
| struct dentry *dentries; |
| struct dirent **namelist = NULL; |
| struct stat stat; |
| int ret; |
| int i; |
| u32 inode; |
| u32 entry_inode; |
| u32 dirs = 0; |
| bool needs_lost_and_found = false; |
| |
| if (full_path) { |
| entries = scandir(full_path, &namelist, filter_dot, (void*)alphasort); |
| if (entries < 0) { |
| #ifdef __GLIBC__ |
| /* The scandir function implemented in glibc has a bug that makes it |
| erroneously fail with ENOMEM under certain circumstances. |
| As a workaround we can retry the scandir call with the same arguments. |
| GLIBC BZ: https://sourceware.org/bugzilla/show_bug.cgi?id=17804 */ |
| if (errno == ENOMEM) |
| entries = scandir(full_path, &namelist, filter_dot, (void*)alphasort); |
| #endif |
| if (entries < 0) { |
| error_errno("scandir"); |
| return EXT4_ALLOCATE_FAILED; |
| } |
| } |
| } |
| |
| if (dir_inode == 0) { |
| /* root directory, check if lost+found already exists */ |
| for (i = 0; i < entries; i++) |
| if (strcmp(namelist[i]->d_name, "lost+found") == 0) |
| break; |
| if (i == entries) |
| needs_lost_and_found = true; |
| } |
| |
| dentries = calloc(entries, sizeof(struct dentry)); |
| if (dentries == NULL) |
| critical_error_errno("malloc"); |
| |
| for (i = 0; i < entries; i++) { |
| dentries[i].filename = strdup(namelist[i]->d_name); |
| if (dentries[i].filename == NULL) |
| critical_error_errno("strdup"); |
| |
| asprintf(&dentries[i].path, "%s%s", dir_path, namelist[i]->d_name); |
| asprintf(&dentries[i].full_path, "%s%s", full_path, namelist[i]->d_name); |
| |
| free(namelist[i]); |
| |
| ret = lstat(dentries[i].full_path, &stat); |
| if (ret < 0) { |
| error_errno("lstat"); |
| i--; |
| entries--; |
| continue; |
| } |
| |
| dentries[i].size = stat.st_size; |
| dentries[i].mode = stat.st_mode & (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO); |
| if (fixed_time == -1) { |
| dentries[i].mtime = stat.st_mtime; |
| } else { |
| dentries[i].mtime = fixed_time; |
| } |
| uint64_t capabilities; |
| if (fs_config_func != NULL) { |
| #ifdef ANDROID |
| unsigned int mode = 0; |
| unsigned int uid = 0; |
| unsigned int gid = 0; |
| int dir = S_ISDIR(stat.st_mode); |
| fs_config_func(dentries[i].path, dir, target_out_path, &uid, &gid, &mode, &capabilities); |
| dentries[i].mode = mode; |
| dentries[i].uid = uid; |
| dentries[i].gid = gid; |
| dentries[i].capabilities = capabilities; |
| #else |
| error("can't set android permissions - built without android support"); |
| #endif |
| } |
| #ifndef _WIN32 |
| if (sehnd) { |
| if (selabel_lookup(sehnd, &dentries[i].secon, dentries[i].path, stat.st_mode) < 0) { |
| error("cannot lookup security context for %s", dentries[i].path); |
| } |
| |
| if (dentries[i].secon && verbose) |
| printf("Labeling %s as %s\n", dentries[i].path, dentries[i].secon); |
| } |
| #endif |
| |
| if (S_ISREG(stat.st_mode)) { |
| dentries[i].file_type = EXT4_FT_REG_FILE; |
| } else if (S_ISDIR(stat.st_mode)) { |
| dentries[i].file_type = EXT4_FT_DIR; |
| dirs++; |
| } else if (S_ISCHR(stat.st_mode)) { |
| dentries[i].file_type = EXT4_FT_CHRDEV; |
| } else if (S_ISBLK(stat.st_mode)) { |
| dentries[i].file_type = EXT4_FT_BLKDEV; |
| } else if (S_ISFIFO(stat.st_mode)) { |
| dentries[i].file_type = EXT4_FT_FIFO; |
| } else if (S_ISSOCK(stat.st_mode)) { |
| dentries[i].file_type = EXT4_FT_SOCK; |
| } else if (S_ISLNK(stat.st_mode)) { |
| dentries[i].file_type = EXT4_FT_SYMLINK; |
| dentries[i].link = calloc(info.block_size, 1); |
| readlink(dentries[i].full_path, dentries[i].link, info.block_size - 1); |
| } else { |
| error("unknown file type on %s", dentries[i].path); |
| i--; |
| entries--; |
| } |
| } |
| free(namelist); |
| |
| if (needs_lost_and_found) { |
| /* insert a lost+found directory at the beginning of the dentries */ |
| struct dentry *tmp = calloc(entries + 1, sizeof(struct dentry)); |
| memset(tmp, 0, sizeof(struct dentry)); |
| memcpy(tmp + 1, dentries, entries * sizeof(struct dentry)); |
| dentries = tmp; |
| |
| dentries[0].filename = strdup("lost+found"); |
| asprintf(&dentries[0].path, "%slost+found", dir_path); |
| dentries[0].full_path = NULL; |
| dentries[0].size = 0; |
| dentries[0].mode = S_IRWXU; |
| dentries[0].file_type = EXT4_FT_DIR; |
| dentries[0].uid = 0; |
| dentries[0].gid = 0; |
| if (sehnd) { |
| if (selabel_lookup(sehnd, &dentries[0].secon, dentries[0].path, dentries[0].mode) < 0) |
| error("cannot lookup security context for %s", dentries[0].path); |
| } |
| entries++; |
| dirs++; |
| } |
| |
| inode = make_directory(dir_inode, entries, dentries, dirs); |
| |
| for (i = 0; i < entries; i++) { |
| if (dentries[i].file_type == EXT4_FT_REG_FILE) { |
| entry_inode = make_file(dentries[i].full_path, dentries[i].size); |
| } else if (dentries[i].file_type == EXT4_FT_DIR) { |
| char *subdir_full_path = NULL; |
| char *subdir_dir_path; |
| if (dentries[i].full_path) { |
| ret = asprintf(&subdir_full_path, "%s/", dentries[i].full_path); |
| if (ret < 0) |
| critical_error_errno("asprintf"); |
| } |
| ret = asprintf(&subdir_dir_path, "%s/", dentries[i].path); |
| if (ret < 0) |
| critical_error_errno("asprintf"); |
| entry_inode = build_directory_structure(subdir_full_path, subdir_dir_path, target_out_path, |
| inode, fs_config_func, sehnd, verbose, fixed_time); |
| free(subdir_full_path); |
| free(subdir_dir_path); |
| } else if (dentries[i].file_type == EXT4_FT_SYMLINK) { |
| entry_inode = make_link(dentries[i].link); |
| } else { |
| error("unknown file type on %s", dentries[i].path); |
| entry_inode = 0; |
| } |
| *dentries[i].inode = entry_inode; |
| |
| ret = inode_set_permissions(entry_inode, dentries[i].mode, |
| dentries[i].uid, dentries[i].gid, |
| dentries[i].mtime); |
| if (ret) |
| error("failed to set permissions on %s\n", dentries[i].path); |
| |
| /* |
| * It's important to call inode_set_selinux() before |
| * inode_set_capabilities(). Extended attributes need to |
| * be stored sorted order, and we guarantee this by making |
| * the calls in the proper order. |
| * Please see xattr_assert_sane() in contents.c |
| */ |
| ret = inode_set_selinux(entry_inode, dentries[i].secon); |
| if (ret) |
| error("failed to set SELinux context on %s\n", dentries[i].path); |
| ret = inode_set_capabilities(entry_inode, dentries[i].capabilities); |
| if (ret) |
| error("failed to set capability on %s\n", dentries[i].path); |
| |
| free(dentries[i].path); |
| free(dentries[i].full_path); |
| free(dentries[i].link); |
| free((void *)dentries[i].filename); |
| free(dentries[i].secon); |
| } |
| |
| free(dentries); |
| return inode; |
| } |
| #endif |
| |
| static u32 compute_block_size() |
| { |
| return 4096; |
| } |
| |
| static u32 compute_journal_blocks() |
| { |
| u32 journal_blocks = DIV_ROUND_UP(info.len, info.block_size) / 64; |
| if (journal_blocks < 1024) |
| journal_blocks = 1024; |
| if (journal_blocks > 32768) |
| journal_blocks = 32768; |
| return journal_blocks; |
| } |
| |
| static u32 compute_blocks_per_group() |
| { |
| return info.block_size * 8; |
| } |
| |
| static u32 compute_inodes() |
| { |
| return DIV_ROUND_UP(info.len, info.block_size) / 4; |
| } |
| |
| static u32 compute_inodes_per_group() |
| { |
| u32 blocks = DIV_ROUND_UP(info.len, info.block_size); |
| u32 block_groups = DIV_ROUND_UP(blocks, info.blocks_per_group); |
| u32 inodes = DIV_ROUND_UP(info.inodes, block_groups); |
| inodes = EXT4_ALIGN(inodes, (info.block_size / info.inode_size)); |
| |
| /* After properly rounding up the number of inodes/group, |
| * make sure to update the total inodes field in the info struct. |
| */ |
| info.inodes = inodes * block_groups; |
| |
| return inodes; |
| } |
| |
| static u32 compute_bg_desc_reserve_blocks() |
| { |
| u32 blocks = DIV_ROUND_UP(info.len, info.block_size); |
| u32 block_groups = DIV_ROUND_UP(blocks, info.blocks_per_group); |
| u32 bg_desc_blocks = DIV_ROUND_UP(block_groups * sizeof(struct ext2_group_desc), |
| info.block_size); |
| |
| u32 bg_desc_reserve_blocks = |
| DIV_ROUND_UP(block_groups * 1024 * sizeof(struct ext2_group_desc), |
| info.block_size) - bg_desc_blocks; |
| |
| if (bg_desc_reserve_blocks > info.block_size / sizeof(u32)) |
| bg_desc_reserve_blocks = info.block_size / sizeof(u32); |
| |
| return bg_desc_reserve_blocks; |
| } |
| |
| void reset_ext4fs_info() { |
| // Reset all the global data structures used by make_ext4fs so it |
| // can be called again. |
| memset(&info, 0, sizeof(info)); |
| memset(&aux_info, 0, sizeof(aux_info)); |
| |
| if (ext4_sparse_file) { |
| sparse_file_destroy(ext4_sparse_file); |
| ext4_sparse_file = NULL; |
| } |
| } |
| |
| int make_ext4fs_sparse_fd(int fd, long long len, |
| const char *mountpoint, struct selabel_handle *sehnd) |
| { |
| return make_ext4fs_sparse_fd_directory(fd, len, mountpoint, sehnd, NULL); |
| } |
| |
| int make_ext4fs_sparse_fd_directory(int fd, long long len, |
| const char *mountpoint, struct selabel_handle *sehnd, |
| const char *directory) |
| { |
| reset_ext4fs_info(); |
| info.len = len; |
| |
| return make_ext4fs_internal(fd, directory, NULL, mountpoint, NULL, |
| 0, 1, 0, 0, 0, |
| sehnd, 0, -1, NULL, NULL, NULL); |
| } |
| |
| int make_ext4fs(const char *filename, long long len, |
| const char *mountpoint, struct selabel_handle *sehnd) |
| { |
| return make_ext4fs_directory(filename, len, mountpoint, sehnd, NULL); |
| } |
| |
| int make_ext4fs_directory(const char *filename, long long len, |
| const char *mountpoint, struct selabel_handle *sehnd, |
| const char *directory) |
| { |
| int fd; |
| int status; |
| |
| reset_ext4fs_info(); |
| info.len = len; |
| |
| fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); |
| if (fd < 0) { |
| error_errno("open"); |
| return EXIT_FAILURE; |
| } |
| |
| status = make_ext4fs_internal(fd, directory, NULL, mountpoint, NULL, |
| 0, 0, 0, 1, 0, |
| sehnd, 0, -1, NULL, NULL, NULL); |
| close(fd); |
| |
| return status; |
| } |
| |
| /* return a newly-malloc'd string that is a copy of str. The new string |
| is guaranteed to have a trailing slash. If absolute is true, the new string |
| is also guaranteed to have a leading slash. |
| */ |
| static char *canonicalize_slashes(const char *str, bool absolute) |
| { |
| char *ret; |
| int len = strlen(str); |
| int newlen = len; |
| char *ptr; |
| |
| if (len == 0) { |
| if (absolute) |
| return strdup("/"); |
| else |
| return strdup(""); |
| } |
| |
| if (str[0] != '/' && absolute) { |
| newlen++; |
| } |
| if (str[len - 1] != '/') { |
| newlen++; |
| } |
| ret = malloc(newlen + 1); |
| if (!ret) { |
| critical_error("malloc"); |
| } |
| |
| ptr = ret; |
| if (str[0] != '/' && absolute) { |
| *ptr++ = '/'; |
| } |
| |
| strcpy(ptr, str); |
| ptr += len; |
| |
| if (str[len - 1] != '/') { |
| *ptr++ = '/'; |
| } |
| |
| if (ptr != ret + newlen) { |
| critical_error("assertion failed\n"); |
| } |
| |
| *ptr = '\0'; |
| |
| return ret; |
| } |
| |
| static char *canonicalize_abs_slashes(const char *str) |
| { |
| return canonicalize_slashes(str, true); |
| } |
| |
| static char *canonicalize_rel_slashes(const char *str) |
| { |
| return canonicalize_slashes(str, false); |
| } |
| |
| static int compare_chunks(const void* chunk1, const void* chunk2) { |
| struct region* c1 = (struct region*) chunk1; |
| struct region* c2 = (struct region*) chunk2; |
| return c1->block - c2->block; |
| } |
| |
| static int get_block_group(u32 block) { |
| unsigned int i, group = 0; |
| |
| for(i = 0; i < aux_info.groups; i++) { |
| if (block >= aux_info.bgs[i].first_block) |
| group = i; |
| else |
| break; |
| } |
| return group; |
| } |
| |
| static void extract_base_fs_allocations(const char *directory, const char *mountpoint, |
| FILE* base_alloc_file_in) { |
| #define err_msg "base file badly formatted" |
| #ifndef _WIN32 |
| // FORMAT Version 1.0: filename blk_mapping |
| const char *base_alloc_file_in_format = "%s %s"; |
| const int base_file_format_param_count = 2; |
| |
| char stored_file_name[MAX_PATH], real_file_name[MAX_PATH], file_map[MAX_BLK_MAPPING_STR]; |
| struct block_allocation *fs_alloc; |
| struct block_group_info *bgs = aux_info.bgs; |
| int major_version = 0, minor_version = 0; |
| unsigned int i; |
| char *base_file_line = NULL; |
| size_t base_file_line_len = 0; |
| |
| printf("[v%d.%d] Generating an Incremental EXT4 image\n", |
| blk_file_major_ver, blk_file_minor_ver); |
| if (base_fs_allocations == NULL) |
| base_fs_allocations = create_allocation(); |
| fs_alloc = base_fs_allocations; |
| |
| fscanf(base_alloc_file_in, blk_file_header_fmt, &major_version, &minor_version); |
| if (major_version == 0) { |
| critical_error("Invalid base file"); |
| } |
| |
| if (major_version != blk_file_major_ver) { |
| critical_error("Incompatible base file: version required is %d.X", |
| blk_file_major_ver); |
| } |
| |
| if (minor_version < blk_file_minor_ver) { |
| critical_error("Incompatible base file: version required is %d.%d or above", |
| blk_file_major_ver, blk_file_minor_ver); |
| } |
| |
| while (getline(&base_file_line, &base_file_line_len, base_alloc_file_in) != -1) { |
| if (sscanf(base_file_line, base_alloc_file_in_format, &stored_file_name, &file_map) |
| != base_file_format_param_count) { |
| continue; |
| } |
| if (strlen(stored_file_name) < strlen(mountpoint)) { |
| continue; |
| } |
| snprintf(real_file_name, MAX_PATH, "%s%s", directory, stored_file_name + strlen(mountpoint)); |
| if (!access(real_file_name, R_OK)) { |
| char *block_range, *end_string; |
| int real_file_fd; |
| int start_block, end_block; |
| u32 block_file_size; |
| u32 real_file_block_size; |
| |
| real_file_fd = open(real_file_name, O_RDONLY); |
| if (real_file_fd == -1) { |
| critical_error(err_msg); |
| } |
| real_file_block_size = get_file_size(real_file_fd); |
| close(real_file_fd); |
| real_file_block_size = DIV_ROUND_UP(real_file_block_size, info.block_size); |
| fs_alloc->filename = strdup(real_file_name); |
| block_range = strtok_r(file_map, ",", &end_string); |
| while (block_range && real_file_block_size) { |
| int block_group; |
| char *range, *end_token = NULL; |
| range = strtok_r(block_range, "-", &end_token); |
| if (!range) { |
| critical_error(err_msg); |
| } |
| start_block = parse_num(range); |
| range = strtok_r(NULL, "-", &end_token); |
| if (!range) { |
| end_block = start_block; |
| } else { |
| end_block = parse_num(range); |
| } |
| // Assummption is that allocations are within the same block group |
| block_group = get_block_group(start_block); |
| if (block_group != get_block_group(end_block)) { |
| critical_error("base file allocation's end block is in a different " |
| "block group than start block. did you change fs params?"); |
| } |
| block_range = strtok_r(NULL, ",", &end_string); |
| int bg_first_block = bgs[block_group].first_block; |
| int min_bg_bound = bgs[block_group].chunks[0].block + bgs[block_group].chunks[0].len; |
| int max_bg_bound = bgs[block_group].chunks[bgs[block_group].chunk_count - 1].block; |
| |
| if (min_bg_bound >= start_block - bg_first_block || |
| max_bg_bound <= end_block - bg_first_block) { |
| continue; |
| } |
| block_file_size = end_block - start_block + 1; |
| if (block_file_size > real_file_block_size) { |
| block_file_size = real_file_block_size; |
| } |
| append_region(fs_alloc, start_block, block_file_size, block_group); |
| reserve_bg_chunk(block_group, start_block - bgs[block_group].first_block, block_file_size); |
| real_file_block_size -= block_file_size; |
| } |
| if (reserve_blocks_for_allocation(fs_alloc) < 0) |
| critical_error("failed to reserve base fs allocation"); |
| fs_alloc->next = create_allocation(); |
| fs_alloc = fs_alloc->next; |
| } |
| } |
| |
| for (i = 0; i < aux_info.groups; i++) { |
| qsort(bgs[i].chunks, bgs[i].chunk_count, sizeof(struct region), compare_chunks); |
| } |
| |
| free(base_file_line); |
| |
| #else |
| return; |
| #endif |
| #undef err_msg |
| } |
| |
| void generate_base_alloc_file_out(FILE* base_alloc_file_out, char* dir, char* mountpoint, |
| struct block_allocation* p) |
| { |
| size_t dirlen = dir ? strlen(dir) : 0; |
| fprintf(base_alloc_file_out, blk_file_header_fmt, blk_file_major_ver, blk_file_minor_ver); |
| fputc('\n', base_alloc_file_out); |
| while (p) { |
| if (dir && strncmp(p->filename, dir, dirlen) == 0) { |
| // substitute mountpoint for the leading directory in the filename, in the output file |
| fprintf(base_alloc_file_out, "%s%s", mountpoint, p->filename + dirlen); |
| } else { |
| fprintf(base_alloc_file_out, "%s", p->filename); |
| } |
| print_blocks(base_alloc_file_out, p, ','); |
| struct block_allocation* pn = p->next; |
| p = pn; |
| } |
| } |
| |
| int make_ext4fs_internal(int fd, const char *_directory, const char *_target_out_directory, |
| const char *_mountpoint, fs_config_func_t fs_config_func, int gzip, |
| int sparse, int crc, int wipe, int real_uuid, |
| struct selabel_handle *sehnd, int verbose, time_t fixed_time, |
| FILE* block_list_file, FILE* base_alloc_file_in, FILE* base_alloc_file_out) |
| { |
| u32 root_inode_num; |
| u16 root_mode; |
| char *mountpoint; |
| char *directory = NULL; |
| char *target_out_directory = NULL; |
| struct block_allocation* p; |
| |
| if (setjmp(setjmp_env)) |
| return EXIT_FAILURE; /* Handle a call to longjmp() */ |
| |
| info.block_device = is_block_device_fd(fd); |
| |
| if (info.block_device && (sparse || gzip || crc)) { |
| fprintf(stderr, "No sparse/gzip/crc allowed for block device\n"); |
| return EXIT_FAILURE; |
| } |
| |
| if (_mountpoint == NULL) { |
| mountpoint = strdup(""); |
| } else { |
| mountpoint = canonicalize_abs_slashes(_mountpoint); |
| } |
| |
| if (_directory) { |
| directory = canonicalize_rel_slashes(_directory); |
| } |
| |
| if (_target_out_directory) { |
| target_out_directory = canonicalize_rel_slashes(_target_out_directory); |
| } |
| |
| if (info.len <= 0) |
| info.len = get_file_size(fd); |
| |
| if (info.len <= 0) { |
| fprintf(stderr, "Need size of filesystem\n"); |
| return EXIT_FAILURE; |
| } |
| |
| if (info.block_size <= 0) |
| info.block_size = compute_block_size(); |
| |
| /* Round down the filesystem length to be a multiple of the block size */ |
| info.len &= ~((u64)info.block_size - 1); |
| |
| if (info.journal_blocks == 0) |
| info.journal_blocks = compute_journal_blocks(); |
| |
| if (info.no_journal == 0) |
| info.feat_compat = EXT4_FEATURE_COMPAT_HAS_JOURNAL; |
| else |
| info.journal_blocks = 0; |
| |
| if (info.blocks_per_group <= 0) |
| info.blocks_per_group = compute_blocks_per_group(); |
| |
| if (info.inodes <= 0) |
| info.inodes = compute_inodes(); |
| |
| if (info.inode_size <= 0) |
| info.inode_size = 256; |
| |
| if (info.label == NULL) |
| info.label = ""; |
| |
| info.inodes_per_group = compute_inodes_per_group(); |
| |
| info.feat_compat |= |
| EXT4_FEATURE_COMPAT_RESIZE_INODE | |
| EXT4_FEATURE_COMPAT_EXT_ATTR; |
| |
| info.feat_ro_compat |= |
| EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | |
| EXT4_FEATURE_RO_COMPAT_LARGE_FILE | |
| EXT4_FEATURE_RO_COMPAT_GDT_CSUM; |
| |
| info.feat_incompat |= |
| EXT4_FEATURE_INCOMPAT_EXTENTS | |
| EXT4_FEATURE_INCOMPAT_FILETYPE; |
| |
| |
| info.bg_desc_reserve_blocks = compute_bg_desc_reserve_blocks(); |
| |
| printf("Creating filesystem with parameters:\n"); |
| printf(" Size: %"PRIu64"\n", info.len); |
| printf(" Block size: %d\n", info.block_size); |
| printf(" Blocks per group: %d\n", info.blocks_per_group); |
| printf(" Inodes per group: %d\n", info.inodes_per_group); |
| printf(" Inode size: %d\n", info.inode_size); |
| printf(" Journal blocks: %d\n", info.journal_blocks); |
| printf(" Label: %s\n", info.label); |
| |
| ext4_create_fs_aux_info(); |
| |
| printf(" Blocks: %"PRIu64"\n", aux_info.len_blocks); |
| printf(" Block groups: %d\n", aux_info.groups); |
| printf(" Reserved block group size: %d\n", info.bg_desc_reserve_blocks); |
| |
| ext4_sparse_file = sparse_file_new(info.block_size, info.len); |
| |
| block_allocator_init(); |
| |
| ext4_fill_in_sb(real_uuid); |
| |
| if (base_alloc_file_in) { |
| extract_base_fs_allocations(directory, mountpoint, base_alloc_file_in); |
| } |
| if (reserve_inodes(0, 10) == EXT4_ALLOCATE_FAILED) |
| error("failed to reserve first 10 inodes"); |
| |
| if (info.feat_compat & EXT4_FEATURE_COMPAT_HAS_JOURNAL) |
| ext4_create_journal_inode(); |
| |
| if (info.feat_compat & EXT4_FEATURE_COMPAT_RESIZE_INODE) |
| ext4_create_resize_inode(); |
| |
| #ifdef _WIN32 |
| // Windows needs only 'create an empty fs image' functionality |
| assert(!directory); |
| root_inode_num = build_default_directory_structure(mountpoint, sehnd); |
| #else |
| if (directory) |
| root_inode_num = build_directory_structure(directory, mountpoint, target_out_directory, 0, |
| fs_config_func, sehnd, verbose, fixed_time); |
| else |
| root_inode_num = build_default_directory_structure(mountpoint, sehnd); |
| #endif |
| |
| root_mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH; |
| inode_set_permissions(root_inode_num, root_mode, 0, 0, 0); |
| |
| #ifndef _WIN32 |
| if (sehnd) { |
| char *secontext = NULL; |
| |
| if (selabel_lookup(sehnd, &secontext, mountpoint, S_IFDIR) < 0) { |
| error("cannot lookup security context for %s", mountpoint); |
| } |
| if (secontext) { |
| if (verbose) { |
| printf("Labeling %s as %s\n", mountpoint, secontext); |
| } |
| inode_set_selinux(root_inode_num, secontext); |
| } |
| freecon(secontext); |
| } |
| #endif |
| |
| ext4_update_free(); |
| |
| // TODO: Consider migrating the OTA tools to the new base alloc file format |
| // used for generating incremental images (see go/incremental-ext4) |
| if (block_list_file) { |
| size_t dirlen = directory ? strlen(directory) : 0; |
| struct block_allocation* p = get_saved_allocation_chain(); |
| while (p) { |
| if (directory && strncmp(p->filename, directory, dirlen) == 0) { |
| // substitute mountpoint for the leading directory in the filename, in the output file |
| fprintf(block_list_file, "%s%s", mountpoint, p->filename + dirlen); |
| } else { |
| fprintf(block_list_file, "%s", p->filename); |
| } |
| print_blocks(block_list_file, p, ' '); |
| struct block_allocation* pn = p->next; |
| p = pn; |
| } |
| } |
| |
| if (base_alloc_file_out) { |
| struct block_allocation* p = get_saved_allocation_chain(); |
| generate_base_alloc_file_out(base_alloc_file_out, directory, mountpoint, p); |
| } |
| |
| printf("Created filesystem with %d/%d inodes and %d/%d blocks\n", |
| aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count, |
| aux_info.sb->s_inodes_count, |
| aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo, |
| aux_info.sb->s_blocks_count_lo); |
| |
| if (wipe && WIPE_IS_SUPPORTED) { |
| wipe_block_device(fd, info.len); |
| } |
| |
| write_ext4_image(fd, gzip, sparse, crc); |
| |
| sparse_file_destroy(ext4_sparse_file); |
| ext4_sparse_file = NULL; |
| |
| p = get_saved_allocation_chain(); |
| while (p) { |
| struct block_allocation* pn = p->next; |
| free_alloc(p); |
| p = pn; |
| } |
| |
| free(mountpoint); |
| free(directory); |
| |
| return 0; |
| } |