| // Copyright 2019 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. |
| |
| #include "src/storage/minfs/allocator/metadata.h" |
| |
| #include <utility> |
| |
| namespace minfs { |
| |
| uint32_t AllocatorFvmMetadata::UnitsPerSlices(uint32_t slices, uint32_t unit_size) const { |
| uint64_t units = (SliceSize() * slices) / unit_size; |
| ZX_DEBUG_ASSERT(units <= std::numeric_limits<uint32_t>::max()); |
| return static_cast<uint32_t>(units); |
| } |
| |
| // NOTE: This helper is only intended to be called for |
| // values of |blocks| which are known to be convertible to slices |
| // without loss. This is checked by a runtime assertion. |
| uint32_t AllocatorFvmMetadata::BlocksToSlices(uint32_t blocks) const { |
| const size_t kBlocksPerSlice = SliceSize() / superblock_->BlockSize(); |
| uint32_t slices = static_cast<uint32_t>(blocks / kBlocksPerSlice); |
| ZX_DEBUG_ASSERT(UnitsPerSlices(slices, superblock_->BlockSize()) == blocks); |
| return slices; |
| } |
| |
| AllocatorMetadata::AllocatorMetadata(blk_t data_start_block, blk_t metadata_start_block, |
| bool using_fvm, AllocatorFvmMetadata fvm, |
| SuperblockManager* superblock, |
| SuperblockAllocatorAccess access) |
| : data_start_block_(data_start_block), |
| metadata_start_block_(metadata_start_block), |
| using_fvm_(using_fvm), |
| fvm_(std::move(fvm)), |
| superblock_(superblock), |
| superblock_access_(access) {} |
| |
| } // namespace minfs |
