| // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_MAPPER_H_ |
| #define UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_MAPPER_H_ |
| |
| #include <string> |
| #include <vector> |
| |
| #include "update_engine/update_metadata.pb.h" |
| |
| namespace chromeos_update_engine { |
| |
| namespace extent_mapper { |
| |
| // Uses the FIBMAP ioctl to get all blocks used by a file and return them |
| // as extents. Blocks are relative to the start of the filesystem. If |
| // there is a sparse "hole" in the file, the blocks for that will be |
| // represented by an extent whose start block is kSpareseHole. |
| // The resulting extents are stored in 'out'. Keep in mind that while |
| // the blocksize of a filesystem is often 4096 bytes, that is not always |
| // the case, so one should consult GetFilesystemBlockSize(), too. |
| // Returns true on success. |
| // |
| // ExtentsForFileChunkFibmap gets the blocks starting from |
| // |chunk_offset|. |chunk_offset| must be a multiple of the block size. If |
| // |chunk_size| is not -1, only blocks covering up to |chunk_size| bytes are |
| // returned. |
| bool ExtentsForFileFibmap(const std::string& path, std::vector<Extent>* out); |
| bool ExtentsForFileChunkFibmap(const std::string& path, |
| off_t chunk_offset, |
| off_t chunk_size, |
| std::vector<Extent>* out); |
| |
| // Puts the blocksize of the filesystem, as used by the FIBMAP ioctl, into |
| // out_blocksize by using the FIGETBSZ ioctl. Returns true on success. |
| bool GetFilesystemBlockSize(const std::string& path, uint32_t* out_blocksize); |
| |
| } // namespace extent_mapper |
| |
| } // namespace chromeos_update_engine |
| |
| #endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_MAPPER_H_ |
