| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Permission is hereby granted, free of charge, to any person |
| * obtaining a copy of this software and associated documentation |
| * files (the "Software"), to deal in the Software without |
| * restriction, including without limitation the rights to use, copy, |
| * modify, merge, publish, distribute, sublicense, and/or sell copies |
| * of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| |
| #ifndef __CORE_FS_MGR_DM_LINEAR_H |
| #define __CORE_FS_MGR_DM_LINEAR_H |
| |
| #include <stdint.h> |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| namespace android { |
| namespace fs_mgr { |
| |
| static const uint32_t kPartitionReadonly = 0x1; |
| |
| class LogicalPartitionExtent { |
| public: |
| LogicalPartitionExtent() : logical_sector_(0), first_sector_(0), num_sectors_(0) {} |
| LogicalPartitionExtent(uint64_t logical_sector, uint64_t first_sector, uint64_t num_sectors, |
| const std::string& block_device) |
| : logical_sector_(logical_sector), |
| first_sector_(first_sector), |
| num_sectors_(num_sectors), |
| block_device_(block_device) {} |
| |
| // Return a string containing the dm_target_spec buffer needed to use this |
| // extent in a device-mapper table. |
| std::string Serialize() const; |
| |
| const std::string& block_device() const { return block_device_; } |
| |
| private: |
| // Logical sector this extent represents in the presented block device. |
| // This is equal to the previous extent's logical sector plus the number |
| // of sectors in that extent. The first extent always starts at 0. |
| uint64_t logical_sector_; |
| // First 512-byte sector of this extent, on the source block device. |
| uint64_t first_sector_; |
| // Number of 512-byte sectors. |
| uint64_t num_sectors_; |
| // Target block device. |
| std::string block_device_; |
| }; |
| |
| struct LogicalPartition { |
| LogicalPartition() : attributes(0), num_sectors(0) {} |
| |
| std::string name; |
| uint32_t attributes; |
| // Number of 512-byte sectors total. |
| uint64_t num_sectors; |
| // List of extents. |
| std::vector<LogicalPartitionExtent> extents; |
| }; |
| |
| struct LogicalPartitionTable { |
| // List of partitions in the partition table. |
| std::vector<LogicalPartition> partitions; |
| }; |
| |
| // Load a dm-linear table from the device tree if one is available; otherwise, |
| // return null. |
| std::unique_ptr<LogicalPartitionTable> LoadPartitionsFromDeviceTree(); |
| |
| // Create device-mapper devices for the given partition table. |
| // |
| // On success, two devices nodes will be created for each partition, both |
| // pointing to the same device: |
| // /dev/block/dm-<N> where N is a sequential ID assigned by device-mapper. |
| // /dev/block/dm-<name> where |name| is the partition name. |
| // |
| bool CreateLogicalPartitions(const LogicalPartitionTable& table); |
| |
| } // namespace fs_mgr |
| } // namespace android |
| |
| #endif // __CORE_FS_MGR_DM_LINEAR_H |