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fs.cpp
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fs.cpp
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#include "fs.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifndef _WIN32
#include <sys/wait.h>
#else
#include <tchar.h>
#include <windows.h>
#endif
#include <unistd.h>
#include <vector>
#include <android-base/errors.h>
#include <android-base/file.h>
#include <android-base/macros.h>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
using android::base::GetExecutableDirectory;
using android::base::StringPrintf;
using android::base::unique_fd;
#ifdef _WIN32
static int exec_cmd(const char* path, const char** argv, const char** envp) {
std::string cmd;
int i = 0;
while (argv[i] != nullptr) {
cmd += argv[i++];
cmd += " ";
}
cmd = cmd.substr(0, cmd.size() - 1);
STARTUPINFO si;
PROCESS_INFORMATION pi;
DWORD exit_code = 0;
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));
std::string env_str;
if (envp != nullptr) {
while (*envp != nullptr) {
env_str += std::string(*envp) + std::string("\0", 1);
envp++;
}
}
if (!CreateProcessA(nullptr, // No module name (use command line)
const_cast<char*>(cmd.c_str()), // Command line
nullptr, // Process handle not inheritable
nullptr, // Thread handle not inheritable
FALSE, // Set handle inheritance to FALSE
0, // No creation flags
env_str.empty() ? nullptr : LPSTR(env_str.c_str()),
nullptr, // Use parent's starting directory
&si, // Pointer to STARTUPINFO structure
&pi) // Pointer to PROCESS_INFORMATION structure
) {
fprintf(stderr, "CreateProcess failed: %s\n",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
return -1;
}
WaitForSingleObject(pi.hProcess, INFINITE);
GetExitCodeProcess(pi.hProcess, &exit_code);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
if (exit_code != 0) {
fprintf(stderr, "%s failed: %lu\n", path, exit_code);
return -1;
}
return 0;
}
#else
static int exec_cmd(const char* path, const char** argv, const char** envp) {
int status;
pid_t child;
if ((child = fork()) == 0) {
execve(path, const_cast<char**>(argv), const_cast<char**>(envp));
_exit(EXIT_FAILURE);
}
if (child < 0) {
fprintf(stderr, "%s failed with fork %s\n", path, strerror(errno));
return -1;
}
if (TEMP_FAILURE_RETRY(waitpid(child, &status, 0)) == -1) {
fprintf(stderr, "%s failed with waitpid %s\n", path, strerror(errno));
return -1;
}
int ret = -1;
if (WIFEXITED(status)) {
ret = WEXITSTATUS(status);
}
if (ret != 0) {
fprintf(stderr, "%s failed with status %d\n", path, ret);
return -1;
}
return 0;
}
#endif
static int generate_ext4_image(const char* fileName, long long partSize, unsigned eraseBlkSize,
unsigned logicalBlkSize, const unsigned fsOptions) {
static constexpr int block_size = 4096;
const std::string exec_dir = android::base::GetExecutableDirectory();
const std::string mke2fs_path = exec_dir + "/mke2fs";
std::vector<const char*> mke2fs_args = {mke2fs_path.c_str(), "-t", "ext4", "-b"};
std::string block_size_str = std::to_string(block_size);
mke2fs_args.push_back(block_size_str.c_str());
std::string ext_attr = "android_sparse";
if (eraseBlkSize != 0 && logicalBlkSize != 0) {
int raid_stride = logicalBlkSize / block_size;
int raid_stripe_width = eraseBlkSize / block_size;
// stride should be the max of 8kb and logical block size
if (logicalBlkSize != 0 && logicalBlkSize < 8192) raid_stride = 8192 / block_size;
// stripe width should be >= stride
if (raid_stripe_width < raid_stride) raid_stripe_width = raid_stride;
ext_attr += StringPrintf(",stride=%d,stripe-width=%d", raid_stride, raid_stripe_width);
}
mke2fs_args.push_back("-E");
mke2fs_args.push_back(ext_attr.c_str());
mke2fs_args.push_back("-O");
mke2fs_args.push_back("uninit_bg");
if (fsOptions & (1 << FS_OPT_PROJID)) {
mke2fs_args.push_back("-I");
mke2fs_args.push_back("512");
}
if (fsOptions & (1 << FS_OPT_CASEFOLD)) {
mke2fs_args.push_back("-O");
mke2fs_args.push_back("casefold");
mke2fs_args.push_back("-E");
mke2fs_args.push_back("encoding=utf8");
}
mke2fs_args.push_back(fileName);
std::string size_str = std::to_string(partSize / block_size);
mke2fs_args.push_back(size_str.c_str());
mke2fs_args.push_back(nullptr);
const std::string mke2fs_env = "MKE2FS_CONFIG=" + GetExecutableDirectory() + "/mke2fs.conf";
std::vector<const char*> mke2fs_envp = {mke2fs_env.c_str(), nullptr};
int ret = exec_cmd(mke2fs_args[0], mke2fs_args.data(), mke2fs_envp.data());
if (ret != 0) {
return -1;
}
return 0;
}
enum {
// clang-format off
FSCK_SUCCESS = 0,
FSCK_ERROR_CORRECTED = 1 << 0,
FSCK_SYSTEM_SHOULD_REBOOT = 1 << 1,
FSCK_ERRORS_LEFT_UNCORRECTED = 1 << 2,
FSCK_OPERATIONAL_ERROR = 1 << 3,
FSCK_USAGE_OR_SYNTAX_ERROR = 1 << 4,
FSCK_USER_CANCELLED = 1 << 5,
FSCK_SHARED_LIB_ERROR = 1 << 7,
// clang-format on
};
static int generate_f2fs_image(const char* fileName, long long partSize, unsigned /* unused */,
unsigned /* unused */, const unsigned fsOptions) {
const std::string exec_dir = android::base::GetExecutableDirectory();
const std::string mkf2fs_path = exec_dir + "/make_f2fs";
std::vector<const char*> mkf2fs_args = {mkf2fs_path.c_str()};
mkf2fs_args.push_back("-S");
std::string size_str = std::to_string(partSize);
mkf2fs_args.push_back(size_str.c_str());
mkf2fs_args.push_back("-g");
mkf2fs_args.push_back("android");
if (fsOptions & (1 << FS_OPT_PROJID)) {
mkf2fs_args.push_back("-O");
mkf2fs_args.push_back("project_quota,extra_attr");
}
if (fsOptions & (1 << FS_OPT_CASEFOLD)) {
mkf2fs_args.push_back("-O");
mkf2fs_args.push_back("casefold");
mkf2fs_args.push_back("-C");
mkf2fs_args.push_back("utf8");
}
if (fsOptions & (1 << FS_OPT_COMPRESS)) {
mkf2fs_args.push_back("-O");
mkf2fs_args.push_back("compression");
mkf2fs_args.push_back("-O");
mkf2fs_args.push_back("extra_attr");
}
mkf2fs_args.push_back(fileName);
mkf2fs_args.push_back(nullptr);
int ret = exec_cmd(mkf2fs_args[0], mkf2fs_args.data(), nullptr);
if (ret != 0) {
return -1;
}
return 0;
}
static const struct fs_generator {
const char* fs_type; //must match what fastboot reports for partition type
//returns 0 or error value
int (*generate)(const char* fileName, long long partSize, unsigned eraseBlkSize,
unsigned logicalBlkSize, const unsigned fsOptions);
} generators[] = {
{ "ext4", generate_ext4_image},
{ "f2fs", generate_f2fs_image},
};
const struct fs_generator* fs_get_generator(const std::string& fs_type) {
for (size_t i = 0; i < sizeof(generators) / sizeof(*generators); i++) {
if (fs_type == generators[i].fs_type) {
return generators + i;
}
}
return nullptr;
}
int fs_generator_generate(const struct fs_generator* gen, const char* fileName, long long partSize,
unsigned eraseBlkSize, unsigned logicalBlkSize,
const unsigned fsOptions) {
return gen->generate(fileName, partSize, eraseBlkSize, logicalBlkSize, fsOptions);
}