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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "fs/Vfat.h"
     18 #include "Devmapper.h"
     19 #include "Loop.h"
     20 #include "ObbVolume.h"
     21 #include "Utils.h"
     22 #include "VoldUtil.h"
     23 
     24 #include <android-base/logging.h>
     25 #include <android-base/stringprintf.h>
     26 #include <android-base/unique_fd.h>
     27 #include <cutils/fs.h>
     28 #include <private/android_filesystem_config.h>
     29 
     30 #include <fcntl.h>
     31 #include <stdlib.h>
     32 #include <sys/mount.h>
     33 #include <sys/stat.h>
     34 #include <sys/types.h>
     35 #include <sys/sysmacros.h>
     36 #include <sys/wait.h>
     37 
     38 using android::base::StringPrintf;
     39 using android::base::unique_fd;
     40 
     41 namespace android {
     42 namespace vold {
     43 
     44 ObbVolume::ObbVolume(int id, const std::string& sourcePath, const std::string& sourceKey,
     45         gid_t ownerGid) : VolumeBase(Type::kObb) {
     46     setId(StringPrintf("obb:%d", id));
     47     mSourcePath = sourcePath;
     48     mSourceKey = sourceKey;
     49     mOwnerGid = ownerGid;
     50 }
     51 
     52 ObbVolume::~ObbVolume() {
     53 }
     54 
     55 status_t ObbVolume::doCreate() {
     56     if (Loop::create(mSourcePath, mLoopPath)) {
     57         PLOG(ERROR) << getId() << " failed to create loop";
     58         return -1;
     59     }
     60 
     61     if (!mSourceKey.empty()) {
     62         unsigned long nr_sec = 0;
     63         {
     64             unique_fd loop_fd(open(mLoopPath.c_str(), O_RDWR | O_CLOEXEC));
     65             if (loop_fd.get() == -1) {
     66                 PLOG(ERROR) << getId() << " failed to open loop";
     67                 return -1;
     68             }
     69 
     70             get_blkdev_size(loop_fd.get(), &nr_sec);
     71             if (nr_sec == 0) {
     72                 PLOG(ERROR) << getId() << " failed to get loop size";
     73                 return -1;
     74             }
     75         }
     76 
     77         char tmp[PATH_MAX];
     78         if (Devmapper::create(getId().c_str(), mLoopPath.c_str(), mSourceKey.c_str(), nr_sec,
     79                 tmp, PATH_MAX)) {
     80             PLOG(ERROR) << getId() << " failed to create dm";
     81             return -1;
     82         }
     83         mDmPath = tmp;
     84         mMountPath = mDmPath;
     85     } else {
     86         mMountPath = mLoopPath;
     87     }
     88     return OK;
     89 }
     90 
     91 status_t ObbVolume::doDestroy() {
     92     if (!mDmPath.empty() && Devmapper::destroy(getId().c_str())) {
     93         PLOG(WARNING) << getId() << " failed to destroy dm";
     94     }
     95     if (!mLoopPath.empty() && Loop::destroyByDevice(mLoopPath.c_str())) {
     96         PLOG(WARNING) << getId() << " failed to destroy loop";
     97     }
     98     mDmPath.clear();
     99     mLoopPath.clear();
    100     return OK;
    101 }
    102 
    103 status_t ObbVolume::doMount() {
    104     auto path = StringPrintf("/mnt/obb/%s", getId().c_str());
    105     setPath(path);
    106 
    107     if (fs_prepare_dir(path.c_str(), 0700, AID_ROOT, AID_ROOT)) {
    108         PLOG(ERROR) << getId() << " failed to create mount point";
    109         return -1;
    110     }
    111     if (android::vold::vfat::Mount(mMountPath, path,
    112             true, false, true, 0, mOwnerGid, 0227, false)) {
    113         PLOG(ERROR) << getId() << " failed to mount";
    114         return -1;
    115     }
    116     return OK;
    117 }
    118 
    119 status_t ObbVolume::doUnmount() {
    120     auto path = getPath();
    121 
    122     KillProcessesUsingPath(path);
    123     ForceUnmount(path);
    124     rmdir(path.c_str());
    125 
    126     return OK;
    127 }
    128 
    129 }  // namespace vold
    130 }  // namespace android
    131