diff options
Diffstat (limited to 'roots.cpp')
| -rw-r--r-- | roots.cpp | 148 |
1 files changed, 109 insertions, 39 deletions
@@ -27,7 +27,9 @@ #include <fcntl.h> #include <android-base/logging.h> -#include <ext4_utils/make_ext4fs.h> +#include <android-base/properties.h> +#include <android-base/stringprintf.h> +#include <android-base/unique_fd.h> #include <ext4_utils/wipe.h> #include <fs_mgr.h> @@ -172,6 +174,23 @@ static int exec_cmd(const char* path, char* const argv[]) { return WEXITSTATUS(status); } +static ssize_t get_file_size(int fd, uint64_t reserve_len) { + struct stat buf; + int ret = fstat(fd, &buf); + if (ret) return 0; + + ssize_t computed_size; + if (S_ISREG(buf.st_mode)) { + computed_size = buf.st_size - reserve_len; + } else if (S_ISBLK(buf.st_mode)) { + computed_size = get_block_device_size(fd) - reserve_len; + } else { + computed_size = 0; + } + + return computed_size; +} + int format_volume(const char* volume, const char* directory) { Volume* v = volume_for_path(volume); if (v == NULL) { @@ -211,35 +230,83 @@ int format_volume(const char* volume, const char* directory) { if (v->length != 0) { length = v->length; } else if (v->key_loc != NULL && strcmp(v->key_loc, "footer") == 0) { - length = -CRYPT_FOOTER_OFFSET; + android::base::unique_fd fd(open(v->blk_device, O_RDONLY)); + if (fd < 0) { + PLOG(ERROR) << "get_file_size: failed to open " << v->blk_device; + return -1; + } + length = get_file_size(fd.get(), CRYPT_FOOTER_OFFSET); + if (length <= 0) { + LOG(ERROR) << "get_file_size: invalid size " << length << " for " << v->blk_device; + return -1; + } } int result; if (strcmp(v->fs_type, "ext4") == 0) { - if (v->erase_blk_size != 0 && v->logical_blk_size != 0) { - result = make_ext4fs_directory_align(v->blk_device, length, volume, sehandle, - directory, v->erase_blk_size, v->logical_blk_size); - } else { - result = make_ext4fs_directory(v->blk_device, length, volume, sehandle, directory); + static constexpr int block_size = 4096; + int raid_stride = v->logical_blk_size / block_size; + int raid_stripe_width = v->erase_blk_size / block_size; + + // stride should be the max of 8kb and logical block size + if (v->logical_blk_size != 0 && v->logical_blk_size < 8192) { + raid_stride = 8192 / block_size; + } + + const char* mke2fs_argv[] = { "/sbin/mke2fs_static", + "-F", + "-t", + "ext4", + "-b", + nullptr, + nullptr, + nullptr, + nullptr, + nullptr, + nullptr }; + + int i = 5; + std::string block_size_str = std::to_string(block_size); + mke2fs_argv[i++] = block_size_str.c_str(); + + std::string ext_args; + if (v->erase_blk_size != 0 && v->logical_blk_size != 0) { + ext_args = android::base::StringPrintf("stride=%d,stripe-width=%d", raid_stride, + raid_stripe_width); + mke2fs_argv[i++] = "-E"; + mke2fs_argv[i++] = ext_args.c_str(); + } + + mke2fs_argv[i++] = v->blk_device; + + std::string size_str = std::to_string(length / block_size); + if (length != 0) { + mke2fs_argv[i++] = size_str.c_str(); + } + + result = exec_cmd(mke2fs_argv[0], const_cast<char**>(mke2fs_argv)); + if (result == 0 && directory != nullptr) { + const char* e2fsdroid_argv[] = { "/sbin/e2fsdroid_static", + "-e", + "-S", + "/file_contexts", + "-f", + directory, + "-a", + volume, + v->blk_device, + nullptr }; + + result = exec_cmd(e2fsdroid_argv[0], const_cast<char**>(e2fsdroid_argv)); } } else { /* Has to be f2fs because we checked earlier. */ - if (v->key_loc != NULL && strcmp(v->key_loc, "footer") == 0 && length < 0) { - LOG(ERROR) << "format_volume: crypt footer + negative length (" << length - << ") not supported on " << v->fs_type; - return -1; - } - if (length < 0) { - LOG(ERROR) << "format_volume: negative length (" << length - << ") not supported on " << v->fs_type; - return -1; - } - char *num_sectors; - if (asprintf(&num_sectors, "%zd", length / 512) <= 0) { + char *num_sectors = nullptr; + if (length >= 512 && asprintf(&num_sectors, "%zd", length / 512) <= 0) { LOG(ERROR) << "format_volume: failed to create " << v->fs_type << " command for " << v->blk_device; return -1; } const char *f2fs_path = "/sbin/mkfs.f2fs"; - const char* const f2fs_argv[] = {"mkfs.f2fs", "-t", "-d1", v->blk_device, num_sectors, NULL}; + const char* const f2fs_argv[] = {"mkfs.f2fs", "-t", "-d1", v->blk_device, num_sectors, nullptr}; result = exec_cmd(f2fs_path, (char* const*)f2fs_argv); free(num_sectors); @@ -260,26 +327,29 @@ int format_volume(const char* volume) { } int setup_install_mounts() { - if (fstab == NULL) { - LOG(ERROR) << "can't set up install mounts: no fstab loaded"; - return -1; - } - for (int i = 0; i < fstab->num_entries; ++i) { - Volume* v = fstab->recs + i; + if (fstab == nullptr) { + LOG(ERROR) << "can't set up install mounts: no fstab loaded"; + return -1; + } + for (int i = 0; i < fstab->num_entries; ++i) { + const Volume* v = fstab->recs + i; - if (strcmp(v->mount_point, "/tmp") == 0 || - strcmp(v->mount_point, "/cache") == 0) { - if (ensure_path_mounted(v->mount_point) != 0) { - LOG(ERROR) << "failed to mount " << v->mount_point; - return -1; - } + // We don't want to do anything with "/". + if (strcmp(v->mount_point, "/") == 0) { + continue; + } - } else { - if (ensure_path_unmounted(v->mount_point) != 0) { - LOG(ERROR) << "failed to unmount " << v->mount_point; - return -1; - } - } + if (strcmp(v->mount_point, "/tmp") == 0 || strcmp(v->mount_point, "/cache") == 0) { + if (ensure_path_mounted(v->mount_point) != 0) { + LOG(ERROR) << "failed to mount " << v->mount_point; + return -1; + } + } else { + if (ensure_path_unmounted(v->mount_point) != 0) { + LOG(ERROR) << "failed to unmount " << v->mount_point; + return -1; + } } - return 0; + } + return 0; } |