/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <linux/fs.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <linux/kdev_t.h>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <selinux/selinux.h>
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#include <logwrap/logwrap.h>
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#include "Utils.h"
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#include "Vfat.h"
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#include "VoldUtil.h"
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using android::base::StringPrintf;
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namespace android {
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namespace vold {
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namespace vfat {
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static const char* kMkfsPath = "/system/bin/newfs_msdos";
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static const char* kFsckPath = "/system/bin/fsck_msdos";
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bool IsSupported() {
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return access(kMkfsPath, X_OK) == 0 && access(kFsckPath, X_OK) == 0 &&
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IsFilesystemSupported("vfat");
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}
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status_t Check(const std::string& source) {
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int pass = 1;
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int rc = 0;
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do {
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std::vector<std::string> cmd;
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cmd.push_back(kFsckPath);
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cmd.push_back("-p");
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cmd.push_back("-f");
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cmd.push_back("-y");
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cmd.push_back(source);
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// Fat devices are currently always untrusted
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rc = ForkExecvp(cmd, nullptr, sFsckUntrustedContext);
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if (rc < 0) {
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LOG(ERROR) << "Filesystem check failed due to logwrap error";
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errno = EIO;
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return -1;
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}
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switch (rc) {
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case 0:
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LOG(INFO) << "Filesystem check completed OK";
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return 0;
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case 2:
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LOG(ERROR) << "Filesystem check failed (not a FAT filesystem)";
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errno = ENODATA;
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return -1;
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case 4:
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if (pass++ <= 3) {
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LOG(WARNING) << "Filesystem modified - rechecking (pass " << pass << ")";
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continue;
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}
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LOG(ERROR) << "Failing check after too many rechecks";
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errno = EIO;
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return -1;
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case 8:
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LOG(ERROR) << "Filesystem check failed (no filesystem)";
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errno = ENODATA;
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return -1;
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default:
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LOG(ERROR) << "Filesystem check failed (unknown exit code " << rc << ")";
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errno = EIO;
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return -1;
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}
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} while (0);
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return 0;
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}
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status_t Mount(const std::string& source, const std::string& target, bool ro, bool remount,
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bool executable, int ownerUid, int ownerGid, int permMask, bool createLost) {
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int rc;
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unsigned long flags;
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const char* c_source = source.c_str();
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const char* c_target = target.c_str();
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flags = MS_NODEV | MS_NOSUID | MS_DIRSYNC | MS_NOATIME;
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flags |= (executable ? 0 : MS_NOEXEC);
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flags |= (ro ? MS_RDONLY : 0);
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flags |= (remount ? MS_REMOUNT : 0);
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auto mountData =
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android::base::StringPrintf("utf8,uid=%d,gid=%d,fmask=%o,dmask=%o,shortname=mixed",
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ownerUid, ownerGid, permMask, permMask);
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rc = mount(c_source, c_target, "vfat", flags, mountData.c_str());
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if (rc && errno == EROFS) {
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LOG(ERROR) << source << " appears to be a read only filesystem - retrying mount RO";
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flags |= MS_RDONLY;
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rc = mount(c_source, c_target, "vfat", flags, mountData.c_str());
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}
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if (rc == 0 && createLost) {
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auto lost_path = android::base::StringPrintf("%s/LOST.DIR", target.c_str());
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if (access(lost_path.c_str(), F_OK)) {
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/*
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* Create a LOST.DIR in the root so we have somewhere to put
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* lost cluster chains (fsck_msdos doesn't currently do this)
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*/
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if (mkdir(lost_path.c_str(), 0755)) {
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PLOG(ERROR) << "Unable to create LOST.DIR";
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}
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}
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}
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return rc;
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}
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status_t Format(const std::string& source, unsigned long numSectors) {
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std::vector<std::string> cmd;
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cmd.push_back(kMkfsPath);
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cmd.push_back("-O");
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cmd.push_back("android");
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cmd.push_back("-A");
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if (numSectors) {
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cmd.push_back("-s");
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cmd.push_back(StringPrintf("%lu", numSectors));
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}
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cmd.push_back(source);
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int rc = ForkExecvp(cmd);
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if (rc < 0) {
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LOG(ERROR) << "Filesystem format failed due to logwrap error";
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errno = EIO;
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return -1;
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}
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if (rc == 0) {
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LOG(INFO) << "Filesystem formatted OK";
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return 0;
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} else {
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LOG(ERROR) << "Format failed (unknown exit code " << rc << ")";
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errno = EIO;
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return -1;
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}
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return 0;
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}
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} // namespace vfat
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} // namespace vold
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} // namespace android
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