1 files changed, 47 insertions, 0 deletions
diff --git a/lib/btrfs/btrfsvol/addr.go b/lib/btrfs/btrfsvol/addr.go
new file mode 100644
index 0000000..6c67826
--- /dev/null
+++ b/lib/btrfs/btrfsvol/addr.go
@@ -0,0 +1,47 @@
+package btrfsvol
+
+import (
+	"fmt"
+
+	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+)
+
+type (
+	PhysicalAddr int64
+	LogicalAddr  int64
+	AddrDelta    int64
+)
+
+func formatAddr(addr int64, f fmt.State, verb rune) {
+	switch verb {
+	case 'v', 's', 'q':
+		str := fmt.Sprintf("%#016x", addr)
+		fmt.Fprintf(f, util.FmtStateString(f, verb), str)
+	default:
+		fmt.Fprintf(f, util.FmtStateString(f, verb), addr)
+	}
+}
+
+func (a PhysicalAddr) Format(f fmt.State, verb rune) { formatAddr(int64(a), f, verb) }
+func (a LogicalAddr) Format(f fmt.State, verb rune)  { formatAddr(int64(a), f, verb) }
+func (d AddrDelta) Format(f fmt.State, verb rune)    { formatAddr(int64(d), f, verb) }
+
+func (a PhysicalAddr) Sub(b PhysicalAddr) AddrDelta { return AddrDelta(a - b) }
+func (a LogicalAddr) Sub(b LogicalAddr) AddrDelta   { return AddrDelta(a - b) }
+
+func (a PhysicalAddr) Add(b AddrDelta) PhysicalAddr { return a + PhysicalAddr(b) }
+func (a LogicalAddr) Add(b AddrDelta) LogicalAddr   { return a + LogicalAddr(b) }
+
+type DeviceID uint64
+
+type QualifiedPhysicalAddr struct {
+	Dev  DeviceID
+	Addr PhysicalAddr
+}
+
+func (a QualifiedPhysicalAddr) Cmp(b QualifiedPhysicalAddr) int {
+	if d := int(a.Dev - b.Dev); d != 0 {
+		return d
+	}
+	return int(a.Addr - b.Addr)
+}