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/*
* Copyright 2018 Google, Inc
*
* 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 _LIBDM_DMTABLE_H_
#define _LIBDM_DMTABLE_H_
#include <stdint.h>
#include <memory>
#include <string>
#include <vector>
#include "dm_target.h"
namespace android {
namespace dm {
class DmTable {
public:
DmTable() : num_sectors_(0){};
// Adds a target to the device mapper table for a range specified in the target object.
// The function will return 'true' if the target was successfully added and doesn't overlap with
// any of the existing targets in the table. Gaps are allowed. The final check, including
// overlaps and gaps are done before loading the table. Returns 'false' on failure.
bool AddTarget(std::unique_ptr<DmTarget>&& target);
// Removes a target from the table for the range specified in the target object. Returns 'false'
// if the target name doesn't match with the one in the table. Returns 'true' if target is
// successfully removed.
bool RemoveTarget(std::unique_ptr<DmTarget>&& target);
// Checks the table to make sure it is valid. i.e. Checks for range overlaps, range gaps
// and returns 'true' if the table is ready to be loaded into kernel. Returns 'false' if the
// table is malformed.
bool valid() const;
// Returns the toatl number of targets.
size_t num_targets() const { return targets_.size(); }
// Returns the total size represented by the table in terms of number of 512-byte sectors.
// NOTE: This function will overlook if there are any gaps in the targets added in the table.
uint64_t num_sectors() const;
// Returns the string represntation of the table that is ready to be passed into the kernel
// as part of the DM_TABLE_LOAD ioctl.
std::string Serialize() const;
~DmTable() = default;
private:
// list of targets defined in this table sorted by
// their start and end sectors.
// Note: Overlapping targets MUST never be added in this list.
std::vector<std::unique_ptr<DmTarget>> targets_;
// Total size in terms of # of sectors, as calculated by looking at the last and the first
// target in 'target_'.
uint64_t num_sectors_;
};
} // namespace dm
} // namespace android
#endif /* _LIBDM_DMTABLE_H_ */
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