Disk.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.
  */

 #define LOG_TAG "Vold"

 #include "Disk.h"
 #include "PublicVolume.h"
 #include "Utils.h"
 #include "VolumeBase.h"

 #include <cutils/log.h>
 #include <diskconfig/diskconfig.h>
 #include <utils/file.h>
 #include <utils/stringprintf.h>

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

 namespace android {
 namespace vold {

 static const char* kSgdiskPath = "/system/bin/sgdisk";
 static const char* kSgdiskToken = " \t\n";

 static const char* kSysfsMmcMaxMinors = "/sys/module/mmcblk/parameters/perdev_minors";

 static const unsigned int kMajorBlockScsi = 8;
 static const unsigned int kMajorBlockMmc = 179;

 static const char* kGptBasicData = "EBD0A0A2-B9E5-4433-87C0-68B6B72699C7";
 static const char* kGptAndroidMeta = "19A710A2-B3CA-11E4-B026-10604B889DCF";
 static const char* kGptAndroidExt = "193D1EA4-B3CA-11E4-B075-10604B889DCF";

 enum class Table {
     kUnknown,
     kMbr,
     kGpt,
 };

 Disk::Disk(const std::string& eventPath, dev_t device) :
         mDevice(device), mSize(-1) {
     mId = StringPrintf("disk:%ud:%ud", major(device), minor(device));
     mSysPath = StringPrintf("/sys/%s", eventPath.c_str());
     mDevPath = StringPrintf("/dev/block/vold/%ud:%ud", major(device), minor(device));

     CreateDeviceNode(mDevPath, mDevice);
 }

 Disk::~Disk() {
     DestroyDeviceNode(mDevPath);
 }

 std::shared_ptr<VolumeBase> Disk::findVolume(const std::string& id) {
     for (std::shared_ptr<VolumeBase>& v : mParts) {
         if (!id.compare(v->getId())) {
             return v;
         }
     }
     return nullptr;
 }

 status_t Disk::readMetadata() {
     mSize = -1;
     mLabel = "";

     {
         std::string path(mSysPath + "/size");
         std::string tmp;
         if (!ReadFileToString(path, &tmp)) {
             ALOGW("Failed to read size from %s: %s", path.c_str(), strerror(errno));
             return -errno;
         }
         mSize = strtoll(tmp.c_str(), nullptr, 10);
     }

     switch (major(mDevice)) {
     case kMajorBlockScsi: {
         std::string path(mSysPath + "/device/vendor");
         std::string tmp;
         if (!ReadFileToString(path, &tmp)) {
             ALOGW("Failed to read vendor from %s: %s", path.c_str(), strerror(errno));
             return -errno;
         }
         mLabel = tmp;
         break;
     }
     case kMajorBlockMmc: {
         std::string path(mSysPath + "/device/manfid");
         std::string tmp;
         if (!ReadFileToString(path, &tmp)) {
             ALOGW("Failed to read manufacturer from %s: %s", path.c_str(), strerror(errno));
             return -errno;
         }
         uint64_t manfid = strtoll(tmp.c_str(), nullptr, 16);
         // Our goal here is to give the user a meaningful label, ideally
         // matching whatever is silk-screened on the card.  To reduce
         // user confusion, this list doesn't contain white-label manfid.
         switch (manfid) {
         case 0x000003: mLabel = "SanDisk"; break;
         case 0x00001b: mLabel = "Samsung"; break;
         case 0x000028: mLabel = "Lexar"; break;
         case 0x000074: mLabel = "Transcend"; break;
         }
         break;
     }
     default: {
         ALOGW("Unsupported block major type %d", major(mDevice));
         return -ENOTSUP;
     }
     }

     return OK;
 }

 status_t Disk::readPartitions() {
     int8_t maxMinors = getMaxMinors();
     if (maxMinors < 0) {
         return -ENOTSUP;
     }

     mParts.clear();

     // Parse partition table
     std::string path(kSgdiskPath);
     path += " --android-dump ";
     path += mDevPath;
     FILE* fp = popen(path.c_str(), "r");
     if (!fp) {
         ALOGE("Failed to run %s: %s", path.c_str(), strerror(errno));
         return -errno;
     }

     char line[1024];
     Table table = Table::kUnknown;
     while (fgets(line, sizeof(line), fp) != nullptr) {
         char* token = strtok(line, kSgdiskToken);
         if (!strcmp(token, "DISK")) {
             const char* type = strtok(nullptr, kSgdiskToken);
             ALOGD("%s: found %s partition table", mId.c_str(), type);
             if (!strcmp(type, "mbr")) {
                 table = Table::kMbr;
             } else if (!strcmp(type, "gpt")) {
                 table = Table::kGpt;
             }
         } else if (!strcmp(token, "PART")) {
             int i = strtol(strtok(nullptr, kSgdiskToken), nullptr, 10);
             if (i <= 0 || i > maxMinors) {
                 ALOGW("%s: ignoring partition %d beyond max supported devices",
                         mId.c_str(), i);
                 continue;
             }
             dev_t partDevice = makedev(major(mDevice), minor(mDevice) + i);

             VolumeBase* vol = nullptr;
             if (table == Table::kMbr) {
                 const char* type = strtok(nullptr, kSgdiskToken);
                 ALOGD("%s: MBR partition %d type %s", mId.c_str(), i, type);

                 switch (strtol(type, nullptr, 16)) {
                 case 0x06: // FAT16
                 case 0x0b: // W95 FAT32 (LBA)
                 case 0x0c: // W95 FAT32 (LBA)
                 case 0x0e: // W95 FAT16 (LBA)
                     vol = new PublicVolume(partDevice);
                     break;
                 }
             } else if (table == Table::kGpt) {
                 const char* typeGuid = strtok(nullptr, kSgdiskToken);
                 const char* partGuid = strtok(nullptr, kSgdiskToken);
                 ALOGD("%s: GPT partition %d type %s, GUID %s", mId.c_str(), i,
                         typeGuid, partGuid);

                 if (!strcasecmp(typeGuid, kGptBasicData)) {
                     vol = new PublicVolume(partDevice);
                 } else if (!strcasecmp(typeGuid, kGptAndroidExt)) {
                     //vol = new PrivateVolume();
                 }
             }

             if (vol != nullptr) {
                 mParts.push_back(std::shared_ptr<VolumeBase>(vol));
             }
         }
     }

     // Ugly last ditch effort, treat entire disk as partition
     if (table == Table::kUnknown) {
         ALOGD("%s: unknown partition table; trying entire device", mId.c_str());
         VolumeBase* vol = new PublicVolume(mDevice);
         mParts.push_back(std::shared_ptr<VolumeBase>(vol));
     }

     pclose(fp);
     return OK;
 }

 status_t Disk::partitionPublic() {
     // TODO: improve this code

     struct disk_info dinfo;
     memset(&dinfo, 0, sizeof(dinfo));

     if (!(dinfo.part_lst = (struct part_info *) malloc(
             MAX_NUM_PARTS * sizeof(struct part_info)))) {
         SLOGE("Failed to malloc prt_lst");
         return -1;
     }

     memset(dinfo.part_lst, 0, MAX_NUM_PARTS * sizeof(struct part_info));
     dinfo.device = strdup(mDevPath.c_str());
     dinfo.scheme = PART_SCHEME_MBR;
     dinfo.sect_size = 512;
     dinfo.skip_lba = 2048;
     dinfo.num_lba = 0;
     dinfo.num_parts = 1;

     struct part_info *pinfo = &dinfo.part_lst[0];

     pinfo->name = strdup("android_sdcard");
     pinfo->flags |= PART_ACTIVE_FLAG;
     pinfo->type = PC_PART_TYPE_FAT32;
     pinfo->len_kb = -1;

     int rc = apply_disk_config(&dinfo, 0);
     if (rc) {
         SLOGE("Failed to apply disk configuration (%d)", rc);
         goto out;
     }

 out:
     free(pinfo->name);
     free(dinfo.device);
     free(dinfo.part_lst);

     return rc;
 }

 status_t Disk::partitionPrivate() {
     return -ENOTSUP;
 }

 status_t Disk::partitionMixed(int8_t ratio) {
     return -ENOTSUP;
 }

 int Disk::getMaxMinors() {
     // Figure out maximum partition devices supported
     switch (major(mDevice)) {
     case kMajorBlockScsi: {
         // Per Documentation/devices.txt this is static
         return 15;
     }
     case kMajorBlockMmc: {
         // Per Documentation/devices.txt this is dynamic
         std::string tmp;
         if (!ReadFileToString(kSysfsMmcMaxMinors, &tmp)) {
             ALOGW("Failed to read max minors");
             return -errno;
         }
         return atoi(tmp.c_str());
     }
     }

     ALOGW("Unsupported block major type %d", major(mDevice));
     return -ENOTSUP;
 }

 }  // 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.
	*/

	#define LOG_TAG "Vold"

	#include "Disk.h"
	#include "PublicVolume.h"
	#include "Utils.h"
	#include "VolumeBase.h"

	#include <cutils/log.h>
	#include <diskconfig/diskconfig.h>
	#include <utils/file.h>
	#include <utils/stringprintf.h>

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

	namespace android {
	namespace vold {

	static const char* kSgdiskPath = "/system/bin/sgdisk";
	static const char* kSgdiskToken = " \t\n";

	static const char* kSysfsMmcMaxMinors = "/sys/module/mmcblk/parameters/perdev_minors";

	static const unsigned int kMajorBlockScsi = 8;
	static const unsigned int kMajorBlockMmc = 179;

	static const char* kGptBasicData = "EBD0A0A2-B9E5-4433-87C0-68B6B72699C7";
	static const char* kGptAndroidMeta = "19A710A2-B3CA-11E4-B026-10604B889DCF";
	static const char* kGptAndroidExt = "193D1EA4-B3CA-11E4-B075-10604B889DCF";

	enum class Table {
	kUnknown,
	kMbr,
	kGpt,
	};

	Disk::Disk(const std::string& eventPath, dev_t device) :
	mDevice(device), mSize(-1) {
	mId = StringPrintf("disk:%ud:%ud", major(device), minor(device));
	mSysPath = StringPrintf("/sys/%s", eventPath.c_str());
	mDevPath = StringPrintf("/dev/block/vold/%ud:%ud", major(device), minor(device));

	CreateDeviceNode(mDevPath, mDevice);
	}

	Disk::~Disk() {
	DestroyDeviceNode(mDevPath);
	}

	std::shared_ptr<VolumeBase> Disk::findVolume(const std::string& id) {
	for (std::shared_ptr<VolumeBase>& v : mParts) {
	if (!id.compare(v->getId())) {
	return v;
	}
	}
	return nullptr;
	}

	status_t Disk::readMetadata() {
	mSize = -1;
	mLabel = "";

	{
	std::string path(mSysPath + "/size");
	std::string tmp;
	if (!ReadFileToString(path, &tmp)) {
	ALOGW("Failed to read size from %s: %s", path.c_str(), strerror(errno));
	return -errno;
	}
	mSize = strtoll(tmp.c_str(), nullptr, 10);
	}

	switch (major(mDevice)) {
	case kMajorBlockScsi: {
	std::string path(mSysPath + "/device/vendor");
	std::string tmp;
	if (!ReadFileToString(path, &tmp)) {
	ALOGW("Failed to read vendor from %s: %s", path.c_str(), strerror(errno));
	return -errno;
	}
	mLabel = tmp;
	break;
	}
	case kMajorBlockMmc: {
	std::string path(mSysPath + "/device/manfid");
	std::string tmp;
	if (!ReadFileToString(path, &tmp)) {
	ALOGW("Failed to read manufacturer from %s: %s", path.c_str(), strerror(errno));
	return -errno;
	}
	uint64_t manfid = strtoll(tmp.c_str(), nullptr, 16);
	// Our goal here is to give the user a meaningful label, ideally
	// matching whatever is silk-screened on the card. To reduce
	// user confusion, this list doesn't contain white-label manfid.
	switch (manfid) {
	case 0x000003: mLabel = "SanDisk"; break;
	case 0x00001b: mLabel = "Samsung"; break;
	case 0x000028: mLabel = "Lexar"; break;
	case 0x000074: mLabel = "Transcend"; break;
	}
	break;
	}
	default: {
	ALOGW("Unsupported block major type %d", major(mDevice));
	return -ENOTSUP;
	}
	}

	return OK;
	}

	status_t Disk::readPartitions() {
	int8_t maxMinors = getMaxMinors();
	if (maxMinors < 0) {
	return -ENOTSUP;
	}

	mParts.clear();

	// Parse partition table
	std::string path(kSgdiskPath);
	path += " --android-dump ";
	path += mDevPath;
	FILE* fp = popen(path.c_str(), "r");
	if (!fp) {
	ALOGE("Failed to run %s: %s", path.c_str(), strerror(errno));
	return -errno;
	}

	char line[1024];
	Table table = Table::kUnknown;
	while (fgets(line, sizeof(line), fp) != nullptr) {
	char* token = strtok(line, kSgdiskToken);
	if (!strcmp(token, "DISK")) {
	const char* type = strtok(nullptr, kSgdiskToken);
	ALOGD("%s: found %s partition table", mId.c_str(), type);
	if (!strcmp(type, "mbr")) {
	table = Table::kMbr;
	} else if (!strcmp(type, "gpt")) {
	table = Table::kGpt;
	}
	} else if (!strcmp(token, "PART")) {
	int i = strtol(strtok(nullptr, kSgdiskToken), nullptr, 10);
	if (i <= 0 \|\| i > maxMinors) {
	ALOGW("%s: ignoring partition %d beyond max supported devices",
	mId.c_str(), i);
	continue;
	}
	dev_t partDevice = makedev(major(mDevice), minor(mDevice) + i);

	VolumeBase* vol = nullptr;
	if (table == Table::kMbr) {
	const char* type = strtok(nullptr, kSgdiskToken);
	ALOGD("%s: MBR partition %d type %s", mId.c_str(), i, type);

	switch (strtol(type, nullptr, 16)) {
	case 0x06: // FAT16
	case 0x0b: // W95 FAT32 (LBA)
	case 0x0c: // W95 FAT32 (LBA)
	case 0x0e: // W95 FAT16 (LBA)
	vol = new PublicVolume(partDevice);
	break;
	}
	} else if (table == Table::kGpt) {
	const char* typeGuid = strtok(nullptr, kSgdiskToken);
	const char* partGuid = strtok(nullptr, kSgdiskToken);
	ALOGD("%s: GPT partition %d type %s, GUID %s", mId.c_str(), i,
	typeGuid, partGuid);

	if (!strcasecmp(typeGuid, kGptBasicData)) {
	vol = new PublicVolume(partDevice);
	} else if (!strcasecmp(typeGuid, kGptAndroidExt)) {
	//vol = new PrivateVolume();
	}
	}

	if (vol != nullptr) {
	mParts.push_back(std::shared_ptr<VolumeBase>(vol));
	}
	}
	}

	// Ugly last ditch effort, treat entire disk as partition
	if (table == Table::kUnknown) {
	ALOGD("%s: unknown partition table; trying entire device", mId.c_str());
	VolumeBase* vol = new PublicVolume(mDevice);
	mParts.push_back(std::shared_ptr<VolumeBase>(vol));
	}

	pclose(fp);
	return OK;
	}

	status_t Disk::partitionPublic() {
	// TODO: improve this code

	struct disk_info dinfo;
	memset(&dinfo, 0, sizeof(dinfo));

	if (!(dinfo.part_lst = (struct part_info *) malloc(
	MAX_NUM_PARTS * sizeof(struct part_info)))) {
	SLOGE("Failed to malloc prt_lst");
	return -1;
	}

	memset(dinfo.part_lst, 0, MAX_NUM_PARTS * sizeof(struct part_info));
	dinfo.device = strdup(mDevPath.c_str());
	dinfo.scheme = PART_SCHEME_MBR;
	dinfo.sect_size = 512;
	dinfo.skip_lba = 2048;
	dinfo.num_lba = 0;
	dinfo.num_parts = 1;

	struct part_info *pinfo = &dinfo.part_lst[0];

	pinfo->name = strdup("android_sdcard");
	pinfo->flags \|= PART_ACTIVE_FLAG;
	pinfo->type = PC_PART_TYPE_FAT32;
	pinfo->len_kb = -1;

	int rc = apply_disk_config(&dinfo, 0);
	if (rc) {
	SLOGE("Failed to apply disk configuration (%d)", rc);
	goto out;
	}

	out:
	free(pinfo->name);
	free(dinfo.device);
	free(dinfo.part_lst);

	return rc;
	}

	status_t Disk::partitionPrivate() {
	return -ENOTSUP;
	}

	status_t Disk::partitionMixed(int8_t ratio) {
	return -ENOTSUP;
	}

	int Disk::getMaxMinors() {
	// Figure out maximum partition devices supported
	switch (major(mDevice)) {
	case kMajorBlockScsi: {
	// Per Documentation/devices.txt this is static
	return 15;
	}
	case kMajorBlockMmc: {
	// Per Documentation/devices.txt this is dynamic
	std::string tmp;
	if (!ReadFileToString(kSysfsMmcMaxMinors, &tmp)) {
	ALOGW("Failed to read max minors");
	return -errno;
	}
	return atoi(tmp.c_str());
	}
	}

	ALOGW("Unsupported block major type %d", major(mDevice));
	return -ENOTSUP;
	}

	} // namespace vold
	} // namespace android