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Commit 23de22d5 authored by David Anderson's avatar David Anderson
Browse files

fs_mgr: Add a method for creating one-off partition instances. 

fastbootd needs to temporarily map and unmap logical partitions in order
to flash them. To make this easier, this change introduces fs_mgr
methods to create and destroy a single logical partition by name.

Bug: 79173901
Test: N/A
Change-Id: Ic085f2175c26a5edf5f18544012dcfe6d8088f09
parent 1d2b29a9

fs_mgr/fs_mgr_dm_linear.cpp

+43 −11
Original line number Diff line number Diff line
@@ -79,6 +79,25 @@ static bool CreateDmTable(const std::string& block_device, const LpMetadata& met 
    return true;

}



static bool CreateLogicalPartition(const std::string& block_device, const LpMetadata& metadata,

                                   const LpMetadataPartition& partition, std::string* path) {

    DeviceMapper& dm = DeviceMapper::Instance();



    DmTable table;

    if (!CreateDmTable(block_device, metadata, partition, &table)) {

        return false;

    }

    std::string name = GetPartitionName(partition);

    if (!dm.CreateDevice(name, table)) {

        return false;

    }

    if (!dm.GetDmDevicePathByName(name, path)) {

        return false;

    }

    LINFO << "Created logical partition " << name << " on device " << *path;

    return true;

}



bool CreateLogicalPartitions(const std::string& block_device) {

    uint32_t slot = SlotNumberForSlotSuffix(fs_mgr_get_slot_suffix());

    auto metadata = ReadMetadata(block_device.c_str(), slot);
@@ -86,23 +105,36 @@ bool CreateLogicalPartitions(const std::string& block_device) { 
        LOG(ERROR) << "Could not read partition table.";

        return true;

    }



    DeviceMapper& dm = DeviceMapper::Instance();

    for (const auto& partition : metadata->partitions) {

        DmTable table;

        if (!CreateDmTable(block_device, *metadata.get(), partition, &table)) {

        std::string path;

        if (!CreateLogicalPartition(block_device, *metadata.get(), partition, &path)) {

            LERROR << "Could not create logical partition: " << GetPartitionName(partition);

            return false;

        }

        std::string name = GetPartitionName(partition);

        if (!dm.CreateDevice(name, table)) {

            return false;

    }

        std::string path;

        dm.GetDmDevicePathByName(partition.name, &path);

        LINFO << "Created logical partition " << name << " on device " << path;

    return true;

}



bool CreateLogicalPartition(const std::string& block_device, uint32_t metadata_slot,

                            const std::string& partition_name, std::string* path) {

    auto metadata = ReadMetadata(block_device.c_str(), metadata_slot);

    if (!metadata) {

        LOG(ERROR) << "Could not read partition table.";

        return true;

    }

    for (const auto& partition : metadata->partitions) {

        if (GetPartitionName(partition) == partition_name) {

            return CreateLogicalPartition(block_device, *metadata.get(), partition, path);

        }

    }

    LERROR << "Could not find any partition with name: " << partition_name;

    return false;

}



bool DestroyLogicalPartition(const std::string& name) {

    DeviceMapper& dm = DeviceMapper::Instance();

    return dm.DeleteDevice(name);

}



}  // namespace fs_mgr

}  // namespace android

fs_mgr/include/fs_mgr_dm_linear.h

+9 −0
Original line number Diff line number Diff line
@@ -39,6 +39,15 @@ namespace fs_mgr { 


bool CreateLogicalPartitions(const std::string& block_device);



// Create a block device for a single logical partition, given metadata and

// the partition name. On success, a path to the partition's block device is

// returned.

bool CreateLogicalPartition(const std::string& block_device, uint32_t metadata_slot,

                            const std::string& partition_name, std::string* path);



// Destroy the block device for a logical partition, by name.

bool DestroyLogicalPartition(const std::string& name);



}  // namespace fs_mgr

}  // namespace android