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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
// BlockGroup64Bit emulates struct ext4_group_desc in fs/ext4/ext4.h.
// It is the block group descriptor struct for 64-bit ext4 filesystems.
// It implements BlockGroup interface. It is an extension of the 32-bit
// version of BlockGroup.
type BlockGroup64Bit struct {
// We embed the 32-bit struct here because 64-bit version is just an extension
// of the 32-bit version.
BlockGroup32Bit
// 64-bit specific fields.
BlockBitmapHi uint32
InodeBitmapHi uint32
InodeTableHi uint32
FreeBlocksCountHi uint16
FreeInodesCountHi uint16
UsedDirsCountHi uint16
ItableUnusedHi uint16
ExcludeBitmapHi uint32
BlockBitmapChecksumHi uint16
InodeBitmapChecksumHi uint16
_ uint32 // Padding to 64 bytes.
}
// Compiles only if BlockGroup64Bit implements BlockGroup.
var _ BlockGroup = (*BlockGroup64Bit)(nil)
// Methods to override. Checksum() and Flags() are not overridden.
// InodeTable implements BlockGroup.InodeTable.
func (bg *BlockGroup64Bit) InodeTable() uint64 {
return (uint64(bg.InodeTableHi) << 32) | uint64(bg.InodeTableLo)
}
// BlockBitmap implements BlockGroup.BlockBitmap.
func (bg *BlockGroup64Bit) BlockBitmap() uint64 {
return (uint64(bg.BlockBitmapHi) << 32) | uint64(bg.BlockBitmapLo)
}
// InodeBitmap implements BlockGroup.InodeBitmap.
func (bg *BlockGroup64Bit) InodeBitmap() uint64 {
return (uint64(bg.InodeBitmapHi) << 32) | uint64(bg.InodeBitmapLo)
}
// ExclusionBitmap implements BlockGroup.ExclusionBitmap.
func (bg *BlockGroup64Bit) ExclusionBitmap() uint64 {
return (uint64(bg.ExcludeBitmapHi) << 32) | uint64(bg.ExcludeBitmapLo)
}
// FreeBlocksCount implements BlockGroup.FreeBlocksCount.
func (bg *BlockGroup64Bit) FreeBlocksCount() uint32 {
return (uint32(bg.FreeBlocksCountHi) << 16) | uint32(bg.FreeBlocksCountLo)
}
// FreeInodesCount implements BlockGroup.FreeInodesCount.
func (bg *BlockGroup64Bit) FreeInodesCount() uint32 {
return (uint32(bg.FreeInodesCountHi) << 16) | uint32(bg.FreeInodesCountLo)
}
// DirectoryCount implements BlockGroup.DirectoryCount.
func (bg *BlockGroup64Bit) DirectoryCount() uint32 {
return (uint32(bg.UsedDirsCountHi) << 16) | uint32(bg.UsedDirsCountLo)
}
// UnusedInodeCount implements BlockGroup.UnusedInodeCount.
func (bg *BlockGroup64Bit) UnusedInodeCount() uint32 {
return (uint32(bg.ItableUnusedHi) << 16) | uint32(bg.ItableUnusedLo)
}
// BlockBitmapChecksum implements BlockGroup.BlockBitmapChecksum.
func (bg *BlockGroup64Bit) BlockBitmapChecksum() uint32 {
return (uint32(bg.BlockBitmapChecksumHi) << 16) | uint32(bg.BlockBitmapChecksumLo)
}
// InodeBitmapChecksum implements BlockGroup.InodeBitmapChecksum.
func (bg *BlockGroup64Bit) InodeBitmapChecksum() uint32 {
return (uint32(bg.InodeBitmapChecksumHi) << 16) | uint32(bg.InodeBitmapChecksumLo)
}
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