1 files changed, 0 insertions, 89 deletions
diff --git a/pkg/btrfs/btrfsvol/devext.go b/pkg/btrfs/btrfsvol/devext.go
deleted file mode 100644
index 8a69c7e..0000000
--- a/pkg/btrfs/btrfsvol/devext.go
+++ /dev/null
@@ -1,89 +0,0 @@
-package btrfsvol
-
-import (
-	"fmt"
-
-	"lukeshu.com/btrfs-tools/pkg/util"
-)
-
-// physical => logical
-type devextMapping struct {
-	PAddr      PhysicalAddr
-	LAddr      LogicalAddr
-	Size       AddrDelta
-	SizeLocked bool
-	Flags      *BlockGroupFlags
-}
-
-// return -1 if 'a' is wholly to the left of 'b'
-// return 0 if there is some overlap between 'a' and 'b'
-// return 1 if 'a is wholly to the right of 'b'
-func (a devextMapping) cmpRange(b devextMapping) int {
-	switch {
-	case a.PAddr.Add(a.Size) <= b.PAddr:
-		// 'a' is wholly to the left of 'b'.
-		return -1
-	case b.PAddr.Add(b.Size) <= a.PAddr:
-		// 'a' is wholly to the right of 'b'.
-		return 1
-	default:
-		// There is some overlap.
-		return 0
-	}
-}
-
-func (a devextMapping) union(rest ...devextMapping) (devextMapping, error) {
-	// sanity check
-	for _, ext := range rest {
-		if a.cmpRange(ext) != 0 {
-			return devextMapping{}, fmt.Errorf("devexts don't overlap")
-		}
-	}
-	exts := append([]devextMapping{a}, rest...)
-	// figure out the physical range (.PAddr and .Size)
-	beg := exts[0].PAddr
-	end := beg.Add(exts[0].Size)
-	for _, ext := range exts {
-		beg = util.Min(beg, ext.PAddr)
-		end = util.Max(end, ext.PAddr.Add(ext.Size))
-	}
-	ret := devextMapping{
-		PAddr: beg,
-		Size:  end.Sub(beg),
-	}
-	for _, ext := range exts {
-		if ext.SizeLocked {
-			ret.SizeLocked = true
-			if ret.Size != ext.Size {
-				return devextMapping{}, fmt.Errorf("member devext has locked size=%v, but union would have size=%v",
-					ext.Size, ret.Size)
-			}
-		}
-	}
-	// figure out the logical range (.LAddr)
-	first := true
-	for _, ext := range exts {
-		offsetWithinRet := ext.PAddr.Sub(ret.PAddr)
-		laddr := ext.LAddr.Add(-offsetWithinRet)
-		if first {
-			ret.LAddr = laddr
-		} else if laddr != ret.LAddr {
-			return ret, fmt.Errorf("devexts don't agree on laddr: %v != %v", ret.LAddr, laddr)
-		}
-	}
-	// figure out the flags (.Flags)
-	for _, ext := range exts {
-		if ext.Flags == nil {
-			continue
-		}
-		if ret.Flags == nil {
-			val := *ext.Flags
-			ret.Flags = &val
-		}
-		if *ret.Flags != *ext.Flags {
-			return ret, fmt.Errorf("mismatch flags: %v != %v", *ret.Flags, *ext.Flags)
-		}
-	}
-	// done
-	return ret, nil
-}