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/*
* Copyright (C) 2018 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.
*/
#ifndef LIBLP_UTILITY_H
#define LIBLP_UTILITY_H
#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>
#include <string>
#include <string_view>
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include "liblp/liblp.h"
#define LP_TAG "[liblp]"
#define LWARN LOG(WARNING) << LP_TAG
#define LINFO LOG(INFO) << LP_TAG
#define LERROR LOG(ERROR) << LP_TAG
#define PWARNING PLOG(WARNING) << LP_TAG
#define PERROR PLOG(ERROR) << LP_TAG
namespace android {
namespace fs_mgr {
// Determine the size of a block device (or file). Logs and returns false on
// error. After calling this, the position of |fd| may have changed.
bool GetDescriptorSize(int fd, uint64_t* size);
// Return the offset of the primary or backup geometry.
int64_t GetPrimaryGeometryOffset();
int64_t GetBackupGeometryOffset();
// Return the offset of a primary metadata slot, relative to the start of the
// device.
int64_t GetPrimaryMetadataOffset(const LpMetadataGeometry& geometry, uint32_t slot_number);
// Return the offset of a backup metadata slot, relative to the end of the
// device.
int64_t GetBackupMetadataOffset(const LpMetadataGeometry& geometry, uint32_t slot_number);
// Return the total space at the start of the super partition that must be set
// aside from headers/metadata and backups.
uint64_t GetTotalMetadataSize(uint32_t metadata_max_size, uint32_t max_slots);
// Cross-platform helper for lseek64().
int64_t SeekFile64(int fd, int64_t offset, int whence);
// Compute a SHA256 hash.
void SHA256(const void* data, size_t length, uint8_t out[32]);
// Align |base| such that it is evenly divisible by |alignment|, which does not
// have to be a power of two.
constexpr uint64_t AlignTo(uint64_t base, uint32_t alignment) {
if (!alignment) {
return base;
}
uint64_t remainder = base % alignment;
if (remainder == 0) {
return base;
}
return base + (alignment - remainder);
}
// Same as the above |AlignTo|, except that |base| is only aligned when added to
// |alignment_offset|.
constexpr uint64_t AlignTo(uint64_t base, uint32_t alignment, uint32_t alignment_offset) {
uint64_t aligned = AlignTo(base, alignment) + alignment_offset;
if (aligned - alignment >= base) {
// We overaligned (base < alignment_offset).
return aligned - alignment;
}
return aligned;
}
// Update names from C++ strings.
bool UpdateBlockDevicePartitionName(LpMetadataBlockDevice* device, const std::string& name);
bool UpdatePartitionGroupName(LpMetadataPartitionGroup* group, const std::string& name);
bool UpdatePartitionName(LpMetadataPartition* partition, const std::string& name);
// Call BLKROSET ioctl on fd so that fd is readonly / read-writable.
bool SetBlockReadonly(int fd, bool readonly);
::android::base::unique_fd GetControlFileOrOpen(std::string_view path, int flags);
// For Virtual A/B updates, modify |metadata| so that it can be written to |target_slot_number|.
bool UpdateMetadataForInPlaceSnapshot(LpMetadata* metadata, uint32_t source_slot_number,
uint32_t target_slot_number);
} // namespace fs_mgr
} // namespace android
#endif // LIBLP_UTILITY_H
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