| // Copyright 2020 The Fuchsia 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 SRC_STORAGE_BLOBFS_PAGER_USER_PAGER_INFO_H_ |
| #define SRC_STORAGE_BLOBFS_PAGER_USER_PAGER_INFO_H_ |
| |
| #ifndef __Fuchsia__ |
| #error Fuchsia-only Header |
| #endif |
| |
| #include <memory> |
| |
| #include "src/storage/blobfs/blob-verifier.h" |
| #include "src/storage/blobfs/compression/seekable-decompressor.h" |
| |
| namespace blobfs { |
| namespace pager { |
| |
| // Info required by the user pager to read in and verify pages. |
| // Initialized by the PageWatcher and passed on to the UserPager. |
| struct UserPagerInfo { |
| // Unique identifier used by UserPager to identify the data source on the underlying block |
| // device. |
| uint32_t identifier = 0; |
| // Block offset (in bytes) the data starts at. Used to inform the UserPager of the offset it |
| // should start issuing reads from. |
| uint64_t data_start_bytes = 0; |
| // Total length of the data. The |verifier| must be set up to verify this length. |
| uint64_t data_length_bytes = 0; |
| // Used to verify the pages as they are read in. |
| // TODO(fxbug.dev/44742): Make BlobVerifier movable, unwrap from unique_ptr. |
| std::unique_ptr<BlobVerifier> verifier; |
| // An optional decompressor used by the chunked compression strategy. The decompressor is invoked |
| // on the raw bytes received from the disk. If unset, blob data is assumed to be managed via some |
| // other compression strategy (including the "uncompressed" strategy). |
| std::unique_ptr<SeekableDecompressor> decompressor; |
| }; |
| |
| } // namespace pager |
| } // namespace blobfs |
| |
| #endif // SRC_STORAGE_BLOBFS_PAGER_USER_PAGER_INFO_H_ |