roots.cpp: Clean up format_volume().
Test: m -j bootable/recovery Test: Wipe data/cache in recovery Change-Id: I11a4bf34015e903992ae2fb100d0b59a9fb75e03
This commit is contained in:
Tao Bao
parent
231c627a55
commit
3c00facb3d
1 changed files with 128 additions and 136 deletions
264
roots.cpp
264
roots.cpp
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@ -25,6 +25,10 @@
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#include <sys/wait.h>
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#include <unistd.h>
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#include <algorithm>
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#include <string>
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#include <vector>
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#include <android-base/logging.h>
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#include <android-base/properties.h>
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#include <android-base/stringprintf.h>
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@ -152,18 +156,26 @@ int ensure_path_unmounted(const char* path) {
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return unmount_mounted_volume(mv);
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}
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static int exec_cmd(const char* path, char* const argv[]) {
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int status;
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pid_t child;
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if ((child = vfork()) == 0) {
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execv(path, argv);
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_exit(EXIT_FAILURE);
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}
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waitpid(child, &status, 0);
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
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LOG(ERROR) << path << " failed with status " << WEXITSTATUS(status);
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}
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return WEXITSTATUS(status);
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static int exec_cmd(const std::vector<std::string>& args) {
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CHECK_NE(static_cast<size_t>(0), args.size());
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std::vector<char*> argv(args.size());
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std::transform(args.cbegin(), args.cend(), argv.begin(),
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[](const std::string& arg) { return const_cast<char*>(arg.c_str()); });
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argv.push_back(nullptr);
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pid_t child;
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if ((child = vfork()) == 0) {
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execv(argv[0], argv.data());
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_exit(EXIT_FAILURE);
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}
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int status;
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waitpid(child, &status, 0);
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
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LOG(ERROR) << args[0] << " failed with status " << WEXITSTATUS(status);
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}
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return WEXITSTATUS(status);
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}
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static ssize_t get_file_size(int fd, uint64_t reserve_len) {
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@ -184,132 +196,112 @@ static ssize_t get_file_size(int fd, uint64_t reserve_len) {
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}
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int format_volume(const char* volume, const char* directory) {
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Volume* v = volume_for_path(volume);
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if (v == NULL) {
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LOG(ERROR) << "unknown volume \"" << volume << "\"";
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return -1;
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}
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if (strcmp(v->fs_type, "ramdisk") == 0) {
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// you can't format the ramdisk.
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LOG(ERROR) << "can't format_volume \"" << volume << "\"";
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return -1;
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}
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if (strcmp(v->mount_point, volume) != 0) {
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LOG(ERROR) << "can't give path \"" << volume << "\" to format_volume";
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return -1;
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}
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if (ensure_path_unmounted(volume) != 0) {
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LOG(ERROR) << "format_volume failed to unmount \"" << v->mount_point << "\"";
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return -1;
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}
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if (strcmp(v->fs_type, "ext4") == 0 || strcmp(v->fs_type, "f2fs") == 0) {
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// if there's a key_loc that looks like a path, it should be a
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// block device for storing encryption metadata. wipe it too.
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if (v->key_loc != NULL && v->key_loc[0] == '/') {
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LOG(INFO) << "wiping " << v->key_loc;
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int fd = open(v->key_loc, O_WRONLY | O_CREAT, 0644);
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if (fd < 0) {
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LOG(ERROR) << "format_volume: failed to open " << v->key_loc;
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return -1;
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}
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wipe_block_device(fd, get_file_size(fd));
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close(fd);
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}
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ssize_t length = 0;
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if (v->length != 0) {
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length = v->length;
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} else if (v->key_loc != NULL && strcmp(v->key_loc, "footer") == 0) {
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android::base::unique_fd fd(open(v->blk_device, O_RDONLY));
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if (fd < 0) {
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PLOG(ERROR) << "get_file_size: failed to open " << v->blk_device;
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return -1;
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}
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length = get_file_size(fd.get(), CRYPT_FOOTER_OFFSET);
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if (length <= 0) {
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LOG(ERROR) << "get_file_size: invalid size " << length << " for " << v->blk_device;
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return -1;
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}
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}
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int result;
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if (strcmp(v->fs_type, "ext4") == 0) {
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static constexpr int block_size = 4096;
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int raid_stride = v->logical_blk_size / block_size;
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int raid_stripe_width = v->erase_blk_size / block_size;
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// stride should be the max of 8kb and logical block size
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if (v->logical_blk_size != 0 && v->logical_blk_size < 8192) {
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raid_stride = 8192 / block_size;
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}
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const char* mke2fs_argv[] = { "/sbin/mke2fs_static",
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"-F",
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"-t",
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"ext4",
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"-b",
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nullptr,
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nullptr,
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nullptr,
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nullptr,
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nullptr,
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nullptr };
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int i = 5;
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std::string block_size_str = std::to_string(block_size);
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mke2fs_argv[i++] = block_size_str.c_str();
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std::string ext_args;
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if (v->erase_blk_size != 0 && v->logical_blk_size != 0) {
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ext_args = android::base::StringPrintf("stride=%d,stripe-width=%d", raid_stride,
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raid_stripe_width);
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mke2fs_argv[i++] = "-E";
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mke2fs_argv[i++] = ext_args.c_str();
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}
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mke2fs_argv[i++] = v->blk_device;
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std::string size_str = std::to_string(length / block_size);
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if (length != 0) {
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mke2fs_argv[i++] = size_str.c_str();
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}
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result = exec_cmd(mke2fs_argv[0], const_cast<char**>(mke2fs_argv));
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if (result == 0 && directory != nullptr) {
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const char* e2fsdroid_argv[] = { "/sbin/e2fsdroid_static",
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"-e",
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"-f",
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directory,
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"-a",
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volume,
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v->blk_device,
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nullptr };
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result = exec_cmd(e2fsdroid_argv[0], const_cast<char**>(e2fsdroid_argv));
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}
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} else { /* Has to be f2fs because we checked earlier. */
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char *num_sectors = nullptr;
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if (length >= 512 && asprintf(&num_sectors, "%zd", length / 512) <= 0) {
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LOG(ERROR) << "format_volume: failed to create " << v->fs_type
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<< " command for " << v->blk_device;
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return -1;
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}
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const char *f2fs_path = "/sbin/mkfs.f2fs";
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const char* const f2fs_argv[] = {"mkfs.f2fs", "-t", "-d1", v->blk_device, num_sectors, nullptr};
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result = exec_cmd(f2fs_path, (char* const*)f2fs_argv);
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free(num_sectors);
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}
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if (result != 0) {
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PLOG(ERROR) << "format_volume: make " << v->fs_type << " failed on " << v->blk_device;
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return -1;
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}
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return 0;
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}
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const Volume* v = volume_for_path(volume);
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if (v == nullptr) {
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LOG(ERROR) << "unknown volume \"" << volume << "\"";
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return -1;
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}
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if (strcmp(v->fs_type, "ramdisk") == 0) {
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LOG(ERROR) << "can't format_volume \"" << volume << "\"";
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return -1;
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}
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if (strcmp(v->mount_point, volume) != 0) {
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LOG(ERROR) << "can't give path \"" << volume << "\" to format_volume";
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return -1;
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}
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if (ensure_path_unmounted(volume) != 0) {
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LOG(ERROR) << "format_volume: Failed to unmount \"" << v->mount_point << "\"";
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return -1;
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}
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if (strcmp(v->fs_type, "ext4") != 0 && strcmp(v->fs_type, "f2fs") != 0) {
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LOG(ERROR) << "format_volume: fs_type \"" << v->fs_type << "\" unsupported";
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return -1;
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}
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// If there's a key_loc that looks like a path, it should be a block device for storing encryption
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// metadata. Wipe it too.
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if (v->key_loc != nullptr && v->key_loc[0] == '/') {
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LOG(INFO) << "Wiping " << v->key_loc;
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int fd = open(v->key_loc, O_WRONLY | O_CREAT, 0644);
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if (fd == -1) {
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PLOG(ERROR) << "format_volume: Failed to open " << v->key_loc;
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return -1;
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}
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wipe_block_device(fd, get_file_size(fd));
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close(fd);
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}
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ssize_t length = 0;
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if (v->length != 0) {
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length = v->length;
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} else if (v->key_loc != nullptr && strcmp(v->key_loc, "footer") == 0) {
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android::base::unique_fd fd(open(v->blk_device, O_RDONLY));
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if (fd == -1) {
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PLOG(ERROR) << "get_file_size: failed to open " << v->blk_device;
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return -1;
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}
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length = get_file_size(fd.get(), CRYPT_FOOTER_OFFSET);
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if (length <= 0) {
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LOG(ERROR) << "get_file_size: invalid size " << length << " for " << v->blk_device;
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return -1;
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}
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}
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if (strcmp(v->fs_type, "ext4") == 0) {
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static constexpr int kBlockSize = 4096;
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std::vector<std::string> mke2fs_args = {
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"/sbin/mke2fs_static", "-F", "-t", "ext4", "-b", std::to_string(kBlockSize),
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};
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int raid_stride = v->logical_blk_size / kBlockSize;
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int raid_stripe_width = v->erase_blk_size / kBlockSize;
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// stride should be the max of 8KB and logical block size
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if (v->logical_blk_size != 0 && v->logical_blk_size < 8192) {
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raid_stride = 8192 / kBlockSize;
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}
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if (v->erase_blk_size != 0 && v->logical_blk_size != 0) {
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mke2fs_args.push_back("-E");
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mke2fs_args.push_back(
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android::base::StringPrintf("stride=%d,stripe-width=%d", raid_stride, raid_stripe_width));
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}
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mke2fs_args.push_back(v->blk_device);
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if (length != 0) {
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mke2fs_args.push_back(std::to_string(length / kBlockSize));
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}
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int result = exec_cmd(mke2fs_args);
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if (result == 0 && directory != nullptr) {
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std::vector<std::string> e2fsdroid_args = {
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"/sbin/e2fsdroid_static",
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"-e",
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"-f",
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directory,
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"-a",
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volume,
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v->blk_device,
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};
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result = exec_cmd(e2fsdroid_args);
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}
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if (result != 0) {
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PLOG(ERROR) << "format_volume: Failed to make ext4 on " << v->blk_device;
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return -1;
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}
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return 0;
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}
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// Has to be f2fs because we checked earlier.
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std::vector<std::string> f2fs_args = { "/sbin/mkfs.f2fs", "-t", "-d1", v->blk_device };
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if (length >= 512) {
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f2fs_args.push_back(std::to_string(length / 512));
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}
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int result = exec_cmd(f2fs_args);
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if (result != 0) {
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PLOG(ERROR) << "format_volume: Failed to make f2fs on " << v->blk_device;
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return -1;
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}
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return 0;
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}
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int format_volume(const char* volume) {
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