fs/Filesystems.cpp

/*
 * Copyright (C) 2014-2021 Tuxera Inc.
 *
 * 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 "Filesystems.h"

#include "Apfs.h"
#include "HfsPlus.h"
#include "Ntfs.h"
#include "Exfat.h"
#include "Vfat.h"

#include <errno.h>

namespace android {
namespace vold {
namespace filesystems {

status_t Detect(const std::string& source, FSType *outFsType) {
    int err;
    bool result = false;

    if ((err = hfsplus::Detect(source, &result)) == 0 && result) {
        *outFsType = FSTYPE_HFSPLUS;
    }
    else if ((err = ntfs::Detect(source, &result)) == 0 && result) {
        *outFsType = FSTYPE_NTFS;
    }
    else if ((err = exfat::Detect(source, &result)) == 0 && result) {
        *outFsType = FSTYPE_EXFAT;
    }
    else if ((err = apfs::Detect(source, &result)) == 0 && result) {
        *outFsType = FSTYPE_APFS;
    }
    else {
        /* Until we implement reliable FAT detection code. */
        *outFsType = FSTYPE_FAT;
    }

    return 0; /* Always succeed since FAT is the default fallback. */
}

bool IsSupported(FSType fsType) {
    switch (fsType) {
    case FSTYPE_APFS:
        return false;
    case FSTYPE_HFSPLUS:
        return false;
    case FSTYPE_NTFS:
        return false;
    case FSTYPE_EXFAT:
        return exfat::IsSupported();
    case FSTYPE_FAT:
        return vfat::IsSupported();
    default:
        return false;
    }
}

status_t Check(FSType fsType, const std::string& source) {
    switch (fsType) {
    case FSTYPE_APFS:
        errno = ENODATA;
        return -1;
    case FSTYPE_HFSPLUS:
        errno = ENODATA;
        return -1;
    case FSTYPE_NTFS:
        errno = ENODATA;
        return -1;
    case FSTYPE_EXFAT:
        return exfat::Check(source);
    case FSTYPE_FAT:
        return vfat::Check(source);
    default:
        errno = ENODATA;
        return -1;
    }
}

status_t Mount(FSType fsType, const std::string& source,
        const std::string& target, bool ro, bool remount, bool executable,
        int ownerUid, int ownerGid, int permMask, bool createLost) {
    switch (fsType) {
    case FSTYPE_APFS:
        errno = ENOTSUP;
        return -1;
    case FSTYPE_HFSPLUS:
        errno = ENOTSUP;
        return -1;
    case FSTYPE_NTFS:
        errno = ENOTSUP;
        return -1;
    case FSTYPE_EXFAT:
        return exfat::Mount(source, target, ro, remount, executable, ownerUid,
                            ownerGid, permMask);
    case FSTYPE_FAT:
        return vfat::Mount(source, target, ro, remount, executable, ownerUid,
                           ownerGid, permMask, createLost);
    default:
        errno = ENOTSUP;
        return -1;
    }
}

const char* FsName(FSType fsType) {
    switch (fsType) {
    case FSTYPE_FAT:
        return "VFAT";
    case FSTYPE_EXFAT:
        return "exFAT";
    case FSTYPE_NTFS:
        return "NTFS";
    case FSTYPE_HFSPLUS:
        return "HFS+";
    case FSTYPE_APFS:
        return "APFS";
    default:
        return "<unknown filesystem>";
    }
}

}  // namespace filesystems
}  // namespace vold
}  // namespace android