model/PublicVolume.cpp - SHIFTPHONES/android_system_vold - Gitiles

 /*
  * Copyright (C) 2015 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 "PublicVolume.h"

 #include "AppFuseUtil.h"
 #include "Utils.h"
 #include "VolumeManager.h"
 #include "fs/Exfat.h"
 #include "fs/Vfat.h"

 #include <android-base/logging.h>
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <cutils/fs.h>
 #include <private/android_filesystem_config.h>
 #include <utils/Timers.h>

 #include <fcntl.h>
 #include <stdlib.h>
 #include <sys/mount.h>
 #include <sys/stat.h>
 #include <sys/sysmacros.h>
 #include <sys/types.h>
 #include <sys/wait.h>

 using android::base::GetBoolProperty;
 using android::base::StringPrintf;

 namespace android {
 namespace vold {

 static const char* kSdcardFsPath = "/system/bin/sdcard";

 static const char* kAsecPath = "/mnt/secure/asec";

 PublicVolume::PublicVolume(dev_t device) : VolumeBase(Type::kPublic), mDevice(device) {
     setId(StringPrintf("public:%u,%u", major(device), minor(device)));
     mDevPath = StringPrintf("/dev/block/vold/%s", getId().c_str());
     mFuseMounted = false;
     mUseSdcardFs = IsSdcardfsUsed();
 }

 PublicVolume::~PublicVolume() {}

 status_t PublicVolume::readMetadata() {
     status_t res = ReadMetadataUntrusted(mDevPath, &mFsType, &mFsUuid, &mFsLabel);

     auto listener = getListener();
     if (listener) listener->onVolumeMetadataChanged(getId(), mFsType, mFsUuid, mFsLabel);

     return res;
 }

 status_t PublicVolume::initAsecStage() {
     std::string legacyPath(mRawPath + "/android_secure");
     std::string securePath(mRawPath + "/.android_secure");

     // Recover legacy secure path
     if (!access(legacyPath.c_str(), R_OK | X_OK) && access(securePath.c_str(), R_OK | X_OK)) {
         if (rename(legacyPath.c_str(), securePath.c_str())) {
             PLOG(WARNING) << getId() << " failed to rename legacy ASEC dir";
         }
     }

     if (TEMP_FAILURE_RETRY(mkdir(securePath.c_str(), 0700))) {
         if (errno != EEXIST) {
             PLOG(WARNING) << getId() << " creating ASEC stage failed";
             return -errno;
         }
     }

     BindMount(securePath, kAsecPath);

     return OK;
 }

 status_t PublicVolume::doCreate() {
     return CreateDeviceNode(mDevPath, mDevice);
 }

 status_t PublicVolume::doDestroy() {
     return DestroyDeviceNode(mDevPath);
 }

 status_t PublicVolume::doMount() {
     bool isVisible = isVisibleForWrite();
     readMetadata();

     if (mFsType == "vfat" && vfat::IsSupported()) {
         if (vfat::Check(mDevPath)) {
             LOG(ERROR) << getId() << " failed filesystem check";
             return -EIO;
         }
     } else if (mFsType == "exfat" && exfat::IsSupported()) {
         if (exfat::Check(mDevPath)) {
             LOG(ERROR) << getId() << " failed filesystem check";
             return -EIO;
         }
     } else {
         LOG(ERROR) << getId() << " unsupported filesystem " << mFsType;
         return -EIO;
     }

     // Use UUID as stable name, if available
     std::string stableName = getId();
     if (!mFsUuid.empty()) {
         stableName = mFsUuid;
     }

     mRawPath = StringPrintf("/mnt/media_rw/%s", stableName.c_str());

     mSdcardFsDefault = StringPrintf("/mnt/runtime/default/%s", stableName.c_str());
     mSdcardFsRead = StringPrintf("/mnt/runtime/read/%s", stableName.c_str());
     mSdcardFsWrite = StringPrintf("/mnt/runtime/write/%s", stableName.c_str());
     mSdcardFsFull = StringPrintf("/mnt/runtime/full/%s", stableName.c_str());

     setInternalPath(mRawPath);
     if (isVisible) {
         setPath(StringPrintf("/storage/%s", stableName.c_str()));
     } else {
         setPath(mRawPath);
     }

     if (fs_prepare_dir(mRawPath.c_str(), 0700, AID_ROOT, AID_ROOT)) {
         PLOG(ERROR) << getId() << " failed to create mount points";
         return -errno;
     }

     if (mFsType == "vfat") {
         if (vfat::Mount(mDevPath, mRawPath, false, false, false, AID_ROOT,
                         (isVisible ? AID_MEDIA_RW : AID_EXTERNAL_STORAGE), 0007, true)) {
             PLOG(ERROR) << getId() << " failed to mount " << mDevPath;
             return -EIO;
         }
     } else if (mFsType == "exfat") {
         if (exfat::Mount(mDevPath, mRawPath, AID_ROOT,
                          (isVisible ? AID_MEDIA_RW : AID_EXTERNAL_STORAGE), 0007)) {
             PLOG(ERROR) << getId() << " failed to mount " << mDevPath;
             return -EIO;
         }
     }

     if (getMountFlags() & MountFlags::kPrimary) {
         initAsecStage();
     }

     if (!isVisible) {
         // Not visible to apps, so no need to spin up sdcardfs or FUSE
         return OK;
     }

     if (mUseSdcardFs) {
         if (fs_prepare_dir(mSdcardFsDefault.c_str(), 0700, AID_ROOT, AID_ROOT) ||
             fs_prepare_dir(mSdcardFsRead.c_str(), 0700, AID_ROOT, AID_ROOT) ||
             fs_prepare_dir(mSdcardFsWrite.c_str(), 0700, AID_ROOT, AID_ROOT) ||
             fs_prepare_dir(mSdcardFsFull.c_str(), 0700, AID_ROOT, AID_ROOT)) {
             PLOG(ERROR) << getId() << " failed to create sdcardfs mount points";
             return -errno;
         }

         dev_t before = GetDevice(mSdcardFsFull);

         int sdcardFsPid;
         if (!(sdcardFsPid = fork())) {
             if (getMountFlags() & MountFlags::kPrimary) {
                 // clang-format off
                 if (execl(kSdcardFsPath, kSdcardFsPath,
                         "-u", "1023", // AID_MEDIA_RW
                         "-g", "1023", // AID_MEDIA_RW
                         "-U", std::to_string(getMountUserId()).c_str(),
                         "-w",
                         mRawPath.c_str(),
                         stableName.c_str(),
                         NULL)) {
                     // clang-format on
                     PLOG(ERROR) << "Failed to exec";
                 }
             } else {
                 // clang-format off
                 if (execl(kSdcardFsPath, kSdcardFsPath,
                         "-u", "1023", // AID_MEDIA_RW
                         "-g", "1023", // AID_MEDIA_RW
                         "-U", std::to_string(getMountUserId()).c_str(),
                         mRawPath.c_str(),
                         stableName.c_str(),
                         NULL)) {
                     // clang-format on
                     PLOG(ERROR) << "Failed to exec";
                 }
             }

             LOG(ERROR) << "sdcardfs exiting";
             _exit(1);
         }

         if (sdcardFsPid == -1) {
             PLOG(ERROR) << getId() << " failed to fork";
             return -errno;
         }

         nsecs_t start = systemTime(SYSTEM_TIME_BOOTTIME);
         while (before == GetDevice(mSdcardFsFull)) {
             LOG(DEBUG) << "Waiting for sdcardfs to spin up...";
             usleep(50000);  // 50ms

             nsecs_t now = systemTime(SYSTEM_TIME_BOOTTIME);
             if (nanoseconds_to_milliseconds(now - start) > 5000) {
                 LOG(WARNING) << "Timed out while waiting for sdcardfs to spin up";
                 return -ETIMEDOUT;
             }
         }
         /* sdcardfs will have exited already. The filesystem will still be running */
         TEMP_FAILURE_RETRY(waitpid(sdcardFsPid, nullptr, 0));
     }

     // We need to mount FUSE *after* sdcardfs, since the FUSE daemon may depend
     // on sdcardfs being up.
     LOG(INFO) << "Mounting public fuse volume";
     android::base::unique_fd fd;
     int user_id = getMountUserId();
     int result = MountUserFuse(user_id, getInternalPath(), stableName, &fd);

     if (result != 0) {
         LOG(ERROR) << "Failed to mount public fuse volume";
         doUnmount();
         return -result;
     }

     mFuseMounted = true;
     auto callback = getMountCallback();
     if (callback) {
         bool is_ready = false;
         callback->onVolumeChecking(std::move(fd), getPath(), getInternalPath(), &is_ready);
         if (!is_ready) {
             LOG(ERROR) << "Failed to complete public volume mount";
             doUnmount();
             return -EIO;
         }
     }

     ConfigureReadAheadForFuse(GetFuseMountPathForUser(user_id, stableName), 256u);

     // See comment in model/EmulatedVolume.cpp
     ConfigureMaxDirtyRatioForFuse(GetFuseMountPathForUser(user_id, stableName), 40u);

     return OK;
 }

 status_t PublicVolume::doUnmount() {
     // Unmount the storage before we kill the FUSE process. If we kill
     // the FUSE process first, most file system operations will return
     // ENOTCONN until the unmount completes. This is an exotic and unusual
     // error code and might cause broken behaviour in applications.
     KillProcessesUsingPath(getPath());

     if (mFuseMounted) {
         // Use UUID as stable name, if available
         std::string stableName = getId();
         if (!mFsUuid.empty()) {
             stableName = mFsUuid;
         }

         if (UnmountUserFuse(getMountUserId(), getInternalPath(), stableName) != OK) {
             PLOG(INFO) << "UnmountUserFuse failed on public fuse volume";
             return -errno;
         }

         mFuseMounted = false;
     }

     ForceUnmount(kAsecPath);

     if (mUseSdcardFs) {
         ForceUnmount(mSdcardFsDefault);
         ForceUnmount(mSdcardFsRead);
         ForceUnmount(mSdcardFsWrite);
         ForceUnmount(mSdcardFsFull);

         rmdir(mSdcardFsDefault.c_str());
         rmdir(mSdcardFsRead.c_str());
         rmdir(mSdcardFsWrite.c_str());
         rmdir(mSdcardFsFull.c_str());

         mSdcardFsDefault.clear();
         mSdcardFsRead.clear();
         mSdcardFsWrite.clear();
         mSdcardFsFull.clear();
     }

     if (ForceUnmount(mRawPath) != 0){
         umount2(mRawPath.c_str(),MNT_DETACH);
         PLOG(INFO) << "use umount lazy if force unmount fail";
     }
     if(rmdir(mRawPath.c_str()) != 0) {
         PLOG(INFO) << "rmdir mRawPath=" << mRawPath << " fail";
         KillProcessesUsingPath(getPath());
     }
     mRawPath.clear();

     return OK;
 }

 status_t PublicVolume::doFormat(const std::string& fsType) {
     bool useVfat = vfat::IsSupported();
     bool useExfat = exfat::IsSupported();
     status_t res = OK;

     // Resolve the target filesystem type
     if (fsType == "auto" && useVfat && useExfat) {
         uint64_t size = 0;

         res = GetBlockDevSize(mDevPath, &size);
         if (res != OK) {
             LOG(ERROR) << "Couldn't get device size " << mDevPath;
             return res;
         }

         // If both vfat & exfat are supported use exfat for SDXC (>~32GiB) cards
         if (size > 32896LL * 1024 * 1024) {
             useVfat = false;
         } else {
             useExfat = false;
         }
     } else if (fsType == "vfat") {
         useExfat = false;
     } else if (fsType == "exfat") {
         useVfat = false;
     }

     if (!useVfat && !useExfat) {
         LOG(ERROR) << "Unsupported filesystem " << fsType;
         return -EINVAL;
     }

     if (WipeBlockDevice(mDevPath) != OK) {
         LOG(WARNING) << getId() << " failed to wipe";
     }

     if (useVfat) {
         res = vfat::Format(mDevPath, 0);
     } else if (useExfat) {
         res = exfat::Format(mDevPath);
     }

     if (res != OK) {
         LOG(ERROR) << getId() << " failed to format";
         res = -errno;
     }

     return res;
 }

 }  // namespace vold
 }  // namespace android
	/*
	* Copyright (C) 2015 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 "PublicVolume.h"

	#include "AppFuseUtil.h"
	#include "Utils.h"
	#include "VolumeManager.h"
	#include "fs/Exfat.h"
	#include "fs/Vfat.h"

	#include <android-base/logging.h>
	#include <android-base/properties.h>
	#include <android-base/stringprintf.h>
	#include <cutils/fs.h>
	#include <private/android_filesystem_config.h>
	#include <utils/Timers.h>

	#include <fcntl.h>
	#include <stdlib.h>
	#include <sys/mount.h>
	#include <sys/stat.h>
	#include <sys/sysmacros.h>
	#include <sys/types.h>
	#include <sys/wait.h>

	using android::base::GetBoolProperty;
	using android::base::StringPrintf;

	namespace android {
	namespace vold {

	static const char* kSdcardFsPath = "/system/bin/sdcard";

	static const char* kAsecPath = "/mnt/secure/asec";

	PublicVolume::PublicVolume(dev_t device) : VolumeBase(Type::kPublic), mDevice(device) {
	setId(StringPrintf("public:%u,%u", major(device), minor(device)));
	mDevPath = StringPrintf("/dev/block/vold/%s", getId().c_str());
	mFuseMounted = false;
	mUseSdcardFs = IsSdcardfsUsed();
	}

	PublicVolume::~PublicVolume() {}

	status_t PublicVolume::readMetadata() {
	status_t res = ReadMetadataUntrusted(mDevPath, &mFsType, &mFsUuid, &mFsLabel);

	auto listener = getListener();
	if (listener) listener->onVolumeMetadataChanged(getId(), mFsType, mFsUuid, mFsLabel);

	return res;
	}

	status_t PublicVolume::initAsecStage() {
	std::string legacyPath(mRawPath + "/android_secure");
	std::string securePath(mRawPath + "/.android_secure");

	// Recover legacy secure path
	if (!access(legacyPath.c_str(), R_OK \| X_OK) && access(securePath.c_str(), R_OK \| X_OK)) {
	if (rename(legacyPath.c_str(), securePath.c_str())) {
	PLOG(WARNING) << getId() << " failed to rename legacy ASEC dir";
	}
	}

	if (TEMP_FAILURE_RETRY(mkdir(securePath.c_str(), 0700))) {
	if (errno != EEXIST) {
	PLOG(WARNING) << getId() << " creating ASEC stage failed";
	return -errno;
	}
	}

	BindMount(securePath, kAsecPath);

	return OK;
	}

	status_t PublicVolume::doCreate() {
	return CreateDeviceNode(mDevPath, mDevice);
	}

	status_t PublicVolume::doDestroy() {
	return DestroyDeviceNode(mDevPath);
	}

	status_t PublicVolume::doMount() {
	bool isVisible = isVisibleForWrite();
	readMetadata();

	if (mFsType == "vfat" && vfat::IsSupported()) {
	if (vfat::Check(mDevPath)) {
	LOG(ERROR) << getId() << " failed filesystem check";
	return -EIO;
	}
	} else if (mFsType == "exfat" && exfat::IsSupported()) {
	if (exfat::Check(mDevPath)) {
	LOG(ERROR) << getId() << " failed filesystem check";
	return -EIO;
	}
	} else {
	LOG(ERROR) << getId() << " unsupported filesystem " << mFsType;
	return -EIO;
	}

	// Use UUID as stable name, if available
	std::string stableName = getId();
	if (!mFsUuid.empty()) {
	stableName = mFsUuid;
	}

	mRawPath = StringPrintf("/mnt/media_rw/%s", stableName.c_str());

	mSdcardFsDefault = StringPrintf("/mnt/runtime/default/%s", stableName.c_str());
	mSdcardFsRead = StringPrintf("/mnt/runtime/read/%s", stableName.c_str());
	mSdcardFsWrite = StringPrintf("/mnt/runtime/write/%s", stableName.c_str());
	mSdcardFsFull = StringPrintf("/mnt/runtime/full/%s", stableName.c_str());

	setInternalPath(mRawPath);
	if (isVisible) {
	setPath(StringPrintf("/storage/%s", stableName.c_str()));
	} else {
	setPath(mRawPath);
	}

	if (fs_prepare_dir(mRawPath.c_str(), 0700, AID_ROOT, AID_ROOT)) {
	PLOG(ERROR) << getId() << " failed to create mount points";
	return -errno;
	}

	if (mFsType == "vfat") {
	if (vfat::Mount(mDevPath, mRawPath, false, false, false, AID_ROOT,
	(isVisible ? AID_MEDIA_RW : AID_EXTERNAL_STORAGE), 0007, true)) {
	PLOG(ERROR) << getId() << " failed to mount " << mDevPath;
	return -EIO;
	}
	} else if (mFsType == "exfat") {
	if (exfat::Mount(mDevPath, mRawPath, AID_ROOT,
	(isVisible ? AID_MEDIA_RW : AID_EXTERNAL_STORAGE), 0007)) {
	PLOG(ERROR) << getId() << " failed to mount " << mDevPath;
	return -EIO;
	}
	}

	if (getMountFlags() & MountFlags::kPrimary) {
	initAsecStage();
	}

	if (!isVisible) {
	// Not visible to apps, so no need to spin up sdcardfs or FUSE
	return OK;
	}

	if (mUseSdcardFs) {
	if (fs_prepare_dir(mSdcardFsDefault.c_str(), 0700, AID_ROOT, AID_ROOT) \|\|
	fs_prepare_dir(mSdcardFsRead.c_str(), 0700, AID_ROOT, AID_ROOT) \|\|
	fs_prepare_dir(mSdcardFsWrite.c_str(), 0700, AID_ROOT, AID_ROOT) \|\|
	fs_prepare_dir(mSdcardFsFull.c_str(), 0700, AID_ROOT, AID_ROOT)) {
	PLOG(ERROR) << getId() << " failed to create sdcardfs mount points";
	return -errno;
	}

	dev_t before = GetDevice(mSdcardFsFull);

	int sdcardFsPid;
	if (!(sdcardFsPid = fork())) {
	if (getMountFlags() & MountFlags::kPrimary) {
	// clang-format off
	if (execl(kSdcardFsPath, kSdcardFsPath,
	"-u", "1023", // AID_MEDIA_RW
	"-g", "1023", // AID_MEDIA_RW
	"-U", std::to_string(getMountUserId()).c_str(),
	"-w",
	mRawPath.c_str(),
	stableName.c_str(),
	NULL)) {
	// clang-format on
	PLOG(ERROR) << "Failed to exec";
	}
	} else {
	// clang-format off
	if (execl(kSdcardFsPath, kSdcardFsPath,
	"-u", "1023", // AID_MEDIA_RW
	"-g", "1023", // AID_MEDIA_RW
	"-U", std::to_string(getMountUserId()).c_str(),
	mRawPath.c_str(),
	stableName.c_str(),
	NULL)) {
	// clang-format on
	PLOG(ERROR) << "Failed to exec";
	}
	}

	LOG(ERROR) << "sdcardfs exiting";
	_exit(1);
	}

	if (sdcardFsPid == -1) {
	PLOG(ERROR) << getId() << " failed to fork";
	return -errno;
	}

	nsecs_t start = systemTime(SYSTEM_TIME_BOOTTIME);
	while (before == GetDevice(mSdcardFsFull)) {
	LOG(DEBUG) << "Waiting for sdcardfs to spin up...";
	usleep(50000); // 50ms

	nsecs_t now = systemTime(SYSTEM_TIME_BOOTTIME);
	if (nanoseconds_to_milliseconds(now - start) > 5000) {
	LOG(WARNING) << "Timed out while waiting for sdcardfs to spin up";
	return -ETIMEDOUT;
	}
	}
	/* sdcardfs will have exited already. The filesystem will still be running */
	TEMP_FAILURE_RETRY(waitpid(sdcardFsPid, nullptr, 0));
	}

	// We need to mount FUSE after sdcardfs, since the FUSE daemon may depend
	// on sdcardfs being up.
	LOG(INFO) << "Mounting public fuse volume";
	android::base::unique_fd fd;
	int user_id = getMountUserId();
	int result = MountUserFuse(user_id, getInternalPath(), stableName, &fd);

	if (result != 0) {
	LOG(ERROR) << "Failed to mount public fuse volume";
	doUnmount();
	return -result;
	}

	mFuseMounted = true;
	auto callback = getMountCallback();
	if (callback) {
	bool is_ready = false;
	callback->onVolumeChecking(std::move(fd), getPath(), getInternalPath(), &is_ready);
	if (!is_ready) {
	LOG(ERROR) << "Failed to complete public volume mount";
	doUnmount();
	return -EIO;
	}
	}

	ConfigureReadAheadForFuse(GetFuseMountPathForUser(user_id, stableName), 256u);

	// See comment in model/EmulatedVolume.cpp
	ConfigureMaxDirtyRatioForFuse(GetFuseMountPathForUser(user_id, stableName), 40u);

	return OK;
	}

	status_t PublicVolume::doUnmount() {
	// Unmount the storage before we kill the FUSE process. If we kill
	// the FUSE process first, most file system operations will return
	// ENOTCONN until the unmount completes. This is an exotic and unusual
	// error code and might cause broken behaviour in applications.
	KillProcessesUsingPath(getPath());

	if (mFuseMounted) {
	// Use UUID as stable name, if available
	std::string stableName = getId();
	if (!mFsUuid.empty()) {
	stableName = mFsUuid;
	}

	if (UnmountUserFuse(getMountUserId(), getInternalPath(), stableName) != OK) {
	PLOG(INFO) << "UnmountUserFuse failed on public fuse volume";
	return -errno;
	}

	mFuseMounted = false;
	}

	ForceUnmount(kAsecPath);

	if (mUseSdcardFs) {
	ForceUnmount(mSdcardFsDefault);
	ForceUnmount(mSdcardFsRead);
	ForceUnmount(mSdcardFsWrite);
	ForceUnmount(mSdcardFsFull);

	rmdir(mSdcardFsDefault.c_str());
	rmdir(mSdcardFsRead.c_str());
	rmdir(mSdcardFsWrite.c_str());
	rmdir(mSdcardFsFull.c_str());

	mSdcardFsDefault.clear();
	mSdcardFsRead.clear();
	mSdcardFsWrite.clear();
	mSdcardFsFull.clear();
	}

	if (ForceUnmount(mRawPath) != 0){
	umount2(mRawPath.c_str(),MNT_DETACH);
	PLOG(INFO) << "use umount lazy if force unmount fail";
	}
	if(rmdir(mRawPath.c_str()) != 0) {
	PLOG(INFO) << "rmdir mRawPath=" << mRawPath << " fail";
	KillProcessesUsingPath(getPath());
	}
	mRawPath.clear();

	return OK;
	}

	status_t PublicVolume::doFormat(const std::string& fsType) {
	bool useVfat = vfat::IsSupported();
	bool useExfat = exfat::IsSupported();
	status_t res = OK;

	// Resolve the target filesystem type
	if (fsType == "auto" && useVfat && useExfat) {
	uint64_t size = 0;

	res = GetBlockDevSize(mDevPath, &size);
	if (res != OK) {
	LOG(ERROR) << "Couldn't get device size " << mDevPath;
	return res;
	}

	// If both vfat & exfat are supported use exfat for SDXC (>~32GiB) cards
	if (size > 32896LL * 1024 * 1024) {
	useVfat = false;
	} else {
	useExfat = false;
	}
	} else if (fsType == "vfat") {
	useExfat = false;
	} else if (fsType == "exfat") {
	useVfat = false;
	}

	if (!useVfat && !useExfat) {
	LOG(ERROR) << "Unsupported filesystem " << fsType;
	return -EINVAL;
	}

	if (WipeBlockDevice(mDevPath) != OK) {
	LOG(WARNING) << getId() << " failed to wipe";
	}

	if (useVfat) {
	res = vfat::Format(mDevPath, 0);
	} else if (useExfat) {
	res = exfat::Format(mDevPath);
	}

	if (res != OK) {
	LOG(ERROR) << getId() << " failed to format";
	res = -errno;
	}

	return res;
	}

	} // namespace vold
	} // namespace android