76 lines
3.2 KiB
Go
76 lines
3.2 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package disklayout
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// BlockGroup32Bit emulates the first half of struct ext4_group_desc in
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// fs/ext4/ext4.h. It is the block group descriptor struct for 32-bit ext4
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// filesystems. It implements BlockGroup interface.
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//
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// The suffix `Lo` here stands for lower bits because this is also used in the
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// 64-bit version where these fields represent the lower half of the fields.
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// The suffix `Raw` has been added to indicate that the field does not have a
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// counterpart in the 64-bit version and to resolve name collision with the
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// interface.
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type BlockGroup32Bit struct {
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BlockBitmapLo uint32
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InodeBitmapLo uint32
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InodeTableLo uint32
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FreeBlocksCountLo uint16
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FreeInodesCountLo uint16
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UsedDirsCountLo uint16
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FlagsRaw uint16
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ExcludeBitmapLo uint32
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BlockBitmapChecksumLo uint16
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InodeBitmapChecksumLo uint16
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ItableUnusedLo uint16
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ChecksumRaw uint16
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}
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// InodeTable implements BlockGroup.InodeTable.
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func (bg *BlockGroup32Bit) InodeTable() uint64 { return uint64(bg.InodeTableLo) }
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// BlockBitmap implements BlockGroup.BlockBitmap.
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func (bg *BlockGroup32Bit) BlockBitmap() uint64 { return uint64(bg.BlockBitmapLo) }
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// InodeBitmap implements BlockGroup.InodeBitmap.
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func (bg *BlockGroup32Bit) InodeBitmap() uint64 { return uint64(bg.InodeBitmapLo) }
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// ExclusionBitmap implements BlockGroup.ExclusionBitmap.
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func (bg *BlockGroup32Bit) ExclusionBitmap() uint64 { return uint64(bg.ExcludeBitmapLo) }
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// FreeBlocksCount implements BlockGroup.FreeBlocksCount.
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func (bg *BlockGroup32Bit) FreeBlocksCount() uint32 { return uint32(bg.FreeBlocksCountLo) }
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// FreeInodesCount implements BlockGroup.FreeInodesCount.
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func (bg *BlockGroup32Bit) FreeInodesCount() uint32 { return uint32(bg.FreeInodesCountLo) }
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// DirectoryCount implements BlockGroup.DirectoryCount.
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func (bg *BlockGroup32Bit) DirectoryCount() uint32 { return uint32(bg.UsedDirsCountLo) }
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// UnusedInodeCount implements BlockGroup.UnusedInodeCount.
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func (bg *BlockGroup32Bit) UnusedInodeCount() uint32 { return uint32(bg.ItableUnusedLo) }
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// BlockBitmapChecksum implements BlockGroup.BlockBitmapChecksum.
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func (bg *BlockGroup32Bit) BlockBitmapChecksum() uint32 { return uint32(bg.BlockBitmapChecksumLo) }
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// InodeBitmapChecksum implements BlockGroup.InodeBitmapChecksum.
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func (bg *BlockGroup32Bit) InodeBitmapChecksum() uint32 { return uint32(bg.InodeBitmapChecksumLo) }
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// Checksum implements BlockGroup.Checksum.
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func (bg *BlockGroup32Bit) Checksum() uint16 { return bg.ChecksumRaw }
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// Flags implements BlockGroup.Flags.
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func (bg *BlockGroup32Bit) Flags() BGFlags { return BGFlagsFromInt(bg.FlagsRaw) }
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