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Free Data Blocks #6

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Free Data Blocks #6

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9570c56
add FreeBlockCount() method
ayushr2 Jun 12, 2019
0fd703c
add unit test for free block
ayushr2 Jun 19, 2019
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9 changes: 9 additions & 0 deletions superblock.go
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Original file line number Diff line number Diff line change
Expand Up @@ -410,6 +410,15 @@ func (sb *Superblock) BlockCount() uint64 {
}
}

// FreeBlockCount returns the number of free data blocks in the fs.
func (sb *Superblock) FreeBlockCount() uint64 {
if sb.is64Bit == true {
return (uint64(sb.data.SFreeBlocksCountHi) << 32) | uint64(sb.data.SFreeBlocksCountLo)
}

return uint64(sb.data.SFreeBlocksCountLo)
}

func (sb *Superblock) BlockGroupCount() (blockGroups uint64) {
blockGroups = sb.BlockCount() / uint64(sb.data.SBlocksPerGroup)

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19 changes: 19 additions & 0 deletions superblock_test.go
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Expand Up @@ -142,3 +142,22 @@ func ExampleSuperblock_ReadPhysicalBlock() {

// Output:
}

func TestSuperblock_FreeBlockCount(t *testing.T) {
filepath := path.Join(assetsPath, "tiny.ext4")

f, err := os.Open(filepath)
log.PanicIf(err)

defer f.Close()

_, err = f.Seek(Superblock0Offset, io.SeekStart)
log.PanicIf(err)

sb, err := NewSuperblockWithReader(f)
log.PanicIf(err)

if sb.FreeBlockCount() != 155 {
t.Fatalf("Supoerblock free blocks count was incorrect.")
}
}