1 files changed, 79 insertions, 0 deletions
diff --git a/cmd/btrfs-fsck.go b/cmd/btrfs-fsck.go
new file mode 100644
index 0000000..8f48430
--- /dev/null
+++ b/cmd/btrfs-fsck.go
@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"lukeshu.com/btrfs-tools/pkg/btrfs"
+	"lukeshu.com/btrfs-tools/pkg/btrfsmisc"
+	"lukeshu.com/btrfs-tools/pkg/util"
+)
+
+func main() {
+	if err := Main(os.Args[1]); err != nil {
+		fmt.Fprintf(os.Stderr, "%s: error: %v\n", os.Args[0], err)
+		os.Exit(1)
+	}
+}
+
+func Main(imgfilename string) (err error) {
+	maybeSetErr := func(_err error) {
+		if _err != nil && err == nil {
+			err = _err
+		}
+	}
+
+	fh, err := os.Open(imgfilename)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		maybeSetErr(fh.Close())
+	}()
+	fs := &btrfs.FS{
+		Devices: []*btrfs.Device{
+			{
+				File: fh,
+			},
+		},
+	}
+
+	superblock, err := fs.Superblock()
+	if err != nil {
+		return fmt.Errorf("superblock: %w", err)
+	}
+
+	if err := fs.Init(); err != nil {
+		fmt.Printf("init chunk tree: error: %v\n", err)
+	}
+
+	foundNodes := make(map[btrfs.LogicalAddr]struct{})
+
+	if err := btrfsmisc.ScanForNodes(fs.Devices[0], superblock.Data, func(nodeRef *util.Ref[btrfs.PhysicalAddr, btrfs.Node], err error) {
+		if err != nil {
+			fmt.Println(err)
+			return
+		}
+		foundNodes[nodeRef.Data.Head.Addr] = struct{}{}
+		fmt.Printf("node@%d: physical_addr=0x%0X logical_addr=0x%0X generation=%d owner=%v level=%d\n",
+			nodeRef.Addr,
+			nodeRef.Addr, nodeRef.Data.Head.Addr,
+			nodeRef.Data.Head.Generation, nodeRef.Data.Head.Owner, nodeRef.Data.Head.Level)
+		srcPaddr := btrfs.QualifiedPhysicalAddr{
+			Dev:  superblock.Data.DevItem.DevUUID,
+			Addr: nodeRef.Addr,
+		}
+		resPaddrs, _ := fs.Resolve(nodeRef.Data.Head.Addr)
+		if len(resPaddrs) == 0 {
+			fmt.Printf("node@%d: logical_addr=0x%0X is not mapped\n",
+				nodeRef.Addr, nodeRef.Data.Head.Addr)
+		} else if _, ok := resPaddrs[srcPaddr]; !ok {
+			fmt.Printf("node@%d: logical_addr=0x%0X maps to %v, not %v\n",
+				nodeRef.Addr, nodeRef.Data.Head.Addr, resPaddrs, srcPaddr)
+		}
+	}); err != nil {
+		return err
+	}
+
+	return nil
+}