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// Copyright 2019 The gVisor Authors.
//
// 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.
package disklayout
// BlockGroup32Bit emulates the first half of struct ext4_group_desc in
// fs/ext4/ext4.h. It is the block group descriptor struct for 32-bit ext4
// filesystems. It implements BlockGroup interface.
//
// The suffix `Lo` here stands for lower bits because this is also used in the
// 64-bit version where these fields represent the lower half of the fields.
// The suffix `Raw` has been added to indicate that the field does not have a
// counterpart in the 64-bit version and to resolve name collision with the
// interface.
type BlockGroup32Bit struct {
BlockBitmapLo uint32
InodeBitmapLo uint32
InodeTableLo uint32
FreeBlocksCountLo uint16
FreeInodesCountLo uint16
UsedDirsCountLo uint16
FlagsRaw uint16
ExcludeBitmapLo uint32
BlockBitmapChecksumLo uint16
InodeBitmapChecksumLo uint16
ItableUnusedLo uint16
ChecksumRaw uint16
}
// InodeTable implements BlockGroup.InodeTable.
func (bg *BlockGroup32Bit) InodeTable() uint64 { return uint64(bg.InodeTableLo) }
// BlockBitmap implements BlockGroup.BlockBitmap.
func (bg *BlockGroup32Bit) BlockBitmap() uint64 { return uint64(bg.BlockBitmapLo) }
// InodeBitmap implements BlockGroup.InodeBitmap.
func (bg *BlockGroup32Bit) InodeBitmap() uint64 { return uint64(bg.InodeBitmapLo) }
// ExclusionBitmap implements BlockGroup.ExclusionBitmap.
func (bg *BlockGroup32Bit) ExclusionBitmap() uint64 { return uint64(bg.ExcludeBitmapLo) }
// FreeBlocksCount implements BlockGroup.FreeBlocksCount.
func (bg *BlockGroup32Bit) FreeBlocksCount() uint32 { return uint32(bg.FreeBlocksCountLo) }
// FreeInodesCount implements BlockGroup.FreeInodesCount.
func (bg *BlockGroup32Bit) FreeInodesCount() uint32 { return uint32(bg.FreeInodesCountLo) }
// DirectoryCount implements BlockGroup.DirectoryCount.
func (bg *BlockGroup32Bit) DirectoryCount() uint32 { return uint32(bg.UsedDirsCountLo) }
// UnusedInodeCount implements BlockGroup.UnusedInodeCount.
func (bg *BlockGroup32Bit) UnusedInodeCount() uint32 { return uint32(bg.ItableUnusedLo) }
// BlockBitmapChecksum implements BlockGroup.BlockBitmapChecksum.
func (bg *BlockGroup32Bit) BlockBitmapChecksum() uint32 { return uint32(bg.BlockBitmapChecksumLo) }
// InodeBitmapChecksum implements BlockGroup.InodeBitmapChecksum.
func (bg *BlockGroup32Bit) InodeBitmapChecksum() uint32 { return uint32(bg.InodeBitmapChecksumLo) }
// Checksum implements BlockGroup.Checksum.
func (bg *BlockGroup32Bit) Checksum() uint16 { return bg.ChecksumRaw }
// Flags implements BlockGroup.Flags.
func (bg *BlockGroup32Bit) Flags() BGFlags { return BGFlagsFromInt(bg.FlagsRaw) }
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