Don't let TreeWalk bail early, add TreeID in to TreePath

1 files changed, 290 insertions, 289 deletions

diff --git a/lib/btrfsprogs/btrfsinspect/print_tree.go b/lib/btrfsprogs/btrfsinspect/print_tree.go
index cc57ae6..2bb6762 100644
--- a/lib/btrfsprogs/btrfsinspect/print_tree.go
+++ b/lib/btrfsprogs/btrfsinspect/print_tree.go
@@ -5,10 +5,13 @@
 package btrfsinspect
 
 import (
+	"context"
 	"fmt"
 	"io"
 	"strings"
 
+	"github.com/datawire/dlib/dlog"
+
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfssum"
@@ -16,330 +19,328 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
 
-func DumpTrees(out, errout io.Writer, fs *btrfs.FS) error {
+func DumpTrees(ctx context.Context, out io.Writer, fs *btrfs.FS) {
 	superblock, err := fs.Superblock()
 	if err != nil {
-		return err
+		dlog.Error(ctx, err)
+		return
 	}
 
 	if superblock.Data.RootTree != 0 {
 		fmt.Fprintf(out, "root tree\n")
-		if err := printTree(out, errout, fs, btrfs.ROOT_TREE_OBJECTID); err != nil {
-			return err
-		}
+		printTree(ctx, out, fs, btrfs.ROOT_TREE_OBJECTID)
 	}
 	if superblock.Data.ChunkTree != 0 {
 		fmt.Fprintf(out, "chunk tree\n")
-		if err := printTree(out, errout, fs, btrfs.CHUNK_TREE_OBJECTID); err != nil {
-			return err
-		}
+		printTree(ctx, out, fs, btrfs.CHUNK_TREE_OBJECTID)
 	}
 	if superblock.Data.LogTree != 0 {
 		fmt.Fprintf(out, "log root tree\n")
-		if err := printTree(out, errout, fs, btrfs.TREE_LOG_OBJECTID); err != nil {
-			return err
-		}
+		printTree(ctx, out, fs, btrfs.TREE_LOG_OBJECTID)
 	}
 	if superblock.Data.BlockGroupRoot != 0 {
 		fmt.Fprintf(out, "block group tree\n")
-		if err := printTree(out, errout, fs, btrfs.BLOCK_GROUP_TREE_OBJECTID); err != nil {
-			return err
-		}
+		printTree(ctx, out, fs, btrfs.BLOCK_GROUP_TREE_OBJECTID)
 	}
-	if err := fs.TreeWalk(btrfs.ROOT_TREE_OBJECTID, btrfs.TreeWalkHandler{
-		Item: func(_ btrfs.TreePath, item btrfs.Item) error {
-			if item.Head.Key.ItemType != btrfsitem.ROOT_ITEM_KEY {
+	fs.TreeWalk(
+		btrfs.ROOT_TREE_OBJECTID,
+		func(err *btrfs.TreeError) {
+			dlog.Error(ctx, err)
+		},
+		btrfs.TreeWalkHandler{
+			Item: func(_ btrfs.TreePath, item btrfs.Item) error {
+				if item.Head.Key.ItemType != btrfsitem.ROOT_ITEM_KEY {
+					return nil
+				}
+				treeName, ok := map[btrfs.ObjID]string{
+					btrfs.ROOT_TREE_OBJECTID:        "root",
+					btrfs.EXTENT_TREE_OBJECTID:      "extent",
+					btrfs.CHUNK_TREE_OBJECTID:       "chunk",
+					btrfs.DEV_TREE_OBJECTID:         "device",
+					btrfs.FS_TREE_OBJECTID:          "fs",
+					btrfs.ROOT_TREE_DIR_OBJECTID:    "directory",
+					btrfs.CSUM_TREE_OBJECTID:        "checksum",
+					btrfs.ORPHAN_OBJECTID:           "orphan",
+					btrfs.TREE_LOG_OBJECTID:         "log",
+					btrfs.TREE_LOG_FIXUP_OBJECTID:   "log fixup",
+					btrfs.TREE_RELOC_OBJECTID:       "reloc",
+					btrfs.DATA_RELOC_TREE_OBJECTID:  "data reloc",
+					btrfs.EXTENT_CSUM_OBJECTID:      "extent checksum",
+					btrfs.QUOTA_TREE_OBJECTID:       "quota",
+					btrfs.UUID_TREE_OBJECTID:        "uuid",
+					btrfs.FREE_SPACE_TREE_OBJECTID:  "free space",
+					btrfs.MULTIPLE_OBJECTIDS:        "multiple",
+					btrfs.BLOCK_GROUP_TREE_OBJECTID: "block group",
+				}[item.Head.Key.ObjectID]
+				if !ok {
+					treeName = "file"
+				}
+				fmt.Fprintf(out, "%v tree %v \n", treeName, fmtKey(item.Head.Key))
+				printTree(ctx, out, fs, item.Head.Key.ObjectID)
 				return nil
-			}
-			treeName, ok := map[btrfs.ObjID]string{
-				btrfs.ROOT_TREE_OBJECTID:        "root",
-				btrfs.EXTENT_TREE_OBJECTID:      "extent",
-				btrfs.CHUNK_TREE_OBJECTID:       "chunk",
-				btrfs.DEV_TREE_OBJECTID:         "device",
-				btrfs.FS_TREE_OBJECTID:          "fs",
-				btrfs.ROOT_TREE_DIR_OBJECTID:    "directory",
-				btrfs.CSUM_TREE_OBJECTID:        "checksum",
-				btrfs.ORPHAN_OBJECTID:           "orphan",
-				btrfs.TREE_LOG_OBJECTID:         "log",
-				btrfs.TREE_LOG_FIXUP_OBJECTID:   "log fixup",
-				btrfs.TREE_RELOC_OBJECTID:       "reloc",
-				btrfs.DATA_RELOC_TREE_OBJECTID:  "data reloc",
-				btrfs.EXTENT_CSUM_OBJECTID:      "extent checksum",
-				btrfs.QUOTA_TREE_OBJECTID:       "quota",
-				btrfs.UUID_TREE_OBJECTID:        "uuid",
-				btrfs.FREE_SPACE_TREE_OBJECTID:  "free space",
-				btrfs.MULTIPLE_OBJECTIDS:        "multiple",
-				btrfs.BLOCK_GROUP_TREE_OBJECTID: "block group",
-			}[item.Head.Key.ObjectID]
-			if !ok {
-				treeName = "file"
-			}
-			fmt.Fprintf(out, "%v tree %v \n", treeName, fmtKey(item.Head.Key))
-			return printTree(out, errout, fs, item.Head.Key.ObjectID)
+			},
 		},
-	}); err != nil {
-		return err
-	}
+	)
 	fmt.Fprintf(out, "total bytes %v\n", superblock.Data.TotalBytes)
 	fmt.Fprintf(out, "bytes used %v\n", superblock.Data.BytesUsed)
 	fmt.Fprintf(out, "uuid %v\n", superblock.Data.FSUUID)
-	return nil
 }
 
 // printTree mimics btrfs-progs
 // kernel-shared/print-tree.c:btrfs_print_tree() and
 // kernel-shared/print-tree.c:btrfs_print_leaf()
-func printTree(out, errout io.Writer, fs *btrfs.FS, treeID btrfs.ObjID) error {
-	return fs.TreeWalk(treeID, btrfs.TreeWalkHandler{
-		Node: func(path btrfs.TreePath, nodeRef *util.Ref[btrfsvol.LogicalAddr, btrfs.Node], err error) error {
-			if err != nil {
-				fmt.Fprintf(errout, "error: %v: %v\n", path, err)
-			}
-			if nodeRef != nil {
-				printHeaderInfo(out, nodeRef.Data)
-			}
-			return nil
-		},
-		PreKeyPointer: func(_ btrfs.TreePath, item btrfs.KeyPointer) error {
-			fmt.Fprintf(out, "\t%v block %v gen %v\n",
-				fmtKey(item.Key),
-				item.BlockPtr,
-				item.Generation)
-			return nil
+func printTree(ctx context.Context, out io.Writer, fs *btrfs.FS, treeID btrfs.ObjID) {
+	fs.TreeWalk(
+		treeID,
+		func(err *btrfs.TreeError) {
+			dlog.Error(ctx, err)
 		},
-		Item: func(path btrfs.TreePath, item btrfs.Item) error {
-			i := path[len(path)-1].ItemIdx
-			fmt.Fprintf(out, "\titem %v %v itemoff %v itemsize %v\n",
-				i,
-				fmtKey(item.Head.Key),
-				item.Head.DataOffset,
-				item.Head.DataSize)
-			switch body := item.Body.(type) {
-			case btrfsitem.FreeSpaceHeader:
-				fmt.Fprintf(out, "\t\tlocation %v\n", fmtKey(body.Location))
-				fmt.Fprintf(out, "\t\tcache generation %v entries %v bitmaps %v\n",
-					body.Generation, body.NumEntries, body.NumBitmaps)
-			case btrfsitem.Inode:
-				fmt.Fprintf(out, ""+
-					"\t\tgeneration %v transid %v size %v nbytes %v\n"+
-					"\t\tblock group %v mode %o links %v uid %v gid %v rdev %v\n"+
-					"\t\tsequence %v flags %v\n",
-					body.Generation, body.TransID, body.Size, body.NumBytes,
-					body.BlockGroup, body.Mode, body.NLink, body.UID, body.GID, body.RDev,
-					body.Sequence, body.Flags)
-				fmt.Fprintf(out, "\t\tatime %v\n", fmtTime(body.ATime))
-				fmt.Fprintf(out, "\t\tctime %v\n", fmtTime(body.CTime))
-				fmt.Fprintf(out, "\t\tmtime %v\n", fmtTime(body.MTime))
-				fmt.Fprintf(out, "\t\totime %v\n", fmtTime(body.OTime))
-			case btrfsitem.InodeRef:
-				fmt.Fprintf(out, "\t\tindex %v namelen %v name: %s\n",
-					body.Index, body.NameLen, body.Name)
-			//case btrfsitem.INODE_EXTREF_KEY:
-			//	// TODO
-			case btrfsitem.DirEntry:
-				fmt.Fprintf(out, "\t\tlocation %v type %v\n",
-					fmtKey(body.Location), body.Type)
-				fmt.Fprintf(out, "\t\ttransid %v data_len %v name_len %v\n",
-					body.TransID, body.DataLen, body.NameLen)
-				fmt.Fprintf(out, "\t\tname: %s\n", body.Name)
-				if len(body.Data) > 0 {
-					fmt.Fprintf(out, "\t\tdata %v\n", body.Data)
-				}
-			//case btrfsitem.DIR_LOG_INDEX_KEY, btrfsitem.DIR_LOG_ITEM_KEY:
-			//	// TODO
-			case btrfsitem.Root:
-				fmt.Fprintf(out, "\t\tgeneration %v root_dirid %v bytenr %d byte_limit %v bytes_used %v\n",
-					body.Generation, body.RootDirID, body.ByteNr, body.ByteLimit, body.BytesUsed)
-				fmt.Fprintf(out, "\t\tlast_snapshot %v flags %v refs %v\n",
-					body.LastSnapshot, body.Flags, body.Refs)
-				fmt.Fprintf(out, "\t\tdrop_progress %v drop_level %v\n",
-					fmtKey(body.DropProgress), body.DropLevel)
-				fmt.Fprintf(out, "\t\tlevel %v generation_v2 %v\n",
-					body.Level, body.GenerationV2)
-				if body.Generation == body.GenerationV2 {
-					fmt.Fprintf(out, "\t\tuuid %v\n", body.UUID)
-					fmt.Fprintf(out, "\t\tparent_uuid %v\n", body.ParentUUID)
-					fmt.Fprintf(out, "\t\treceived_uuid %v\n", body.ReceivedUUID)
-					fmt.Fprintf(out, "\t\tctransid %v otransid %v stransid %v rtransid %v\n",
-						body.CTransID, body.OTransID, body.STransID, body.RTransID)
+		btrfs.TreeWalkHandler{
+			Node: func(path btrfs.TreePath, nodeRef *util.Ref[btrfsvol.LogicalAddr, btrfs.Node]) error {
+				printHeaderInfo(out, nodeRef.Data)
+				return nil
+			},
+			PreKeyPointer: func(_ btrfs.TreePath, item btrfs.KeyPointer) error {
+				fmt.Fprintf(out, "\t%v block %v gen %v\n",
+					fmtKey(item.Key),
+					item.BlockPtr,
+					item.Generation)
+				return nil
+			},
+			Item: func(path btrfs.TreePath, item btrfs.Item) error {
+				i := path.Nodes[len(path.Nodes)-1].ItemIdx
+				fmt.Fprintf(out, "\titem %v %v itemoff %v itemsize %v\n",
+					i,
+					fmtKey(item.Head.Key),
+					item.Head.DataOffset,
+					item.Head.DataSize)
+				switch body := item.Body.(type) {
+				case btrfsitem.FreeSpaceHeader:
+					fmt.Fprintf(out, "\t\tlocation %v\n", fmtKey(body.Location))
+					fmt.Fprintf(out, "\t\tcache generation %v entries %v bitmaps %v\n",
+						body.Generation, body.NumEntries, body.NumBitmaps)
+				case btrfsitem.Inode:
+					fmt.Fprintf(out, ""+
+						"\t\tgeneration %v transid %v size %v nbytes %v\n"+
+						"\t\tblock group %v mode %o links %v uid %v gid %v rdev %v\n"+
+						"\t\tsequence %v flags %v\n",
+						body.Generation, body.TransID, body.Size, body.NumBytes,
+						body.BlockGroup, body.Mode, body.NLink, body.UID, body.GID, body.RDev,
+						body.Sequence, body.Flags)
+					fmt.Fprintf(out, "\t\tatime %v\n", fmtTime(body.ATime))
 					fmt.Fprintf(out, "\t\tctime %v\n", fmtTime(body.CTime))
+					fmt.Fprintf(out, "\t\tmtime %v\n", fmtTime(body.MTime))
 					fmt.Fprintf(out, "\t\totime %v\n", fmtTime(body.OTime))
-					fmt.Fprintf(out, "\t\tstime %v\n", fmtTime(body.STime))
-					fmt.Fprintf(out, "\t\trtime %v\n", fmtTime(body.RTime))
-				}
-			case btrfsitem.RootRef:
-				var tag string
-				switch item.Head.Key.ItemType {
-				case btrfsitem.ROOT_REF_KEY:
-					tag = "ref"
-				case btrfsitem.ROOT_BACKREF_KEY:
-					tag = "backref"
-				default:
-					tag = fmt.Sprintf("(error: unhandled RootRef item type: %v)", item.Head.Key.ItemType)
-				}
-				fmt.Fprintf(out, "\t\troot %v key dirid %v sequence %v name %s\n",
-					tag, body.DirID, body.Sequence, body.Name)
-			case btrfsitem.Extent:
-				fmt.Fprintf(out, "\t\trefs %v gen %v flags %v\n",
-					body.Head.Refs, body.Head.Generation, body.Head.Flags)
-				if body.Head.Flags.Has(btrfsitem.EXTENT_FLAG_TREE_BLOCK) {
-					fmt.Fprintf(out, "\t\ttree block %v level %v\n",
-						fmtKey(body.Info.Key), body.Info.Level)
-				}
-				printExtentInlineRefs(out, body.Refs)
-			case btrfsitem.Metadata:
-				fmt.Fprintf(out, "\t\trefs %v gen %v flags %v\n",
-					body.Head.Refs, body.Head.Generation, body.Head.Flags)
-				fmt.Fprintf(out, "\t\ttree block skinny level %v\n", item.Head.Key.Offset)
-				printExtentInlineRefs(out, body.Refs)
-			//case btrfsitem.EXTENT_DATA_REF_KEY:
-			//	// TODO
-			//case btrfsitem.SHARED_DATA_REF_KEY:
-			//	// TODO
-			case btrfsitem.ExtentCSum:
-				sb, _ := fs.Superblock()
-				sectorSize := btrfsvol.AddrDelta(sb.Data.SectorSize)
+				case btrfsitem.InodeRef:
+					fmt.Fprintf(out, "\t\tindex %v namelen %v name: %s\n",
+						body.Index, body.NameLen, body.Name)
+				//case btrfsitem.INODE_EXTREF_KEY:
+				//	// TODO
+				case btrfsitem.DirEntry:
+					fmt.Fprintf(out, "\t\tlocation %v type %v\n",
+						fmtKey(body.Location), body.Type)
+					fmt.Fprintf(out, "\t\ttransid %v data_len %v name_len %v\n",
+						body.TransID, body.DataLen, body.NameLen)
+					fmt.Fprintf(out, "\t\tname: %s\n", body.Name)
+					if len(body.Data) > 0 {
+						fmt.Fprintf(out, "\t\tdata %v\n", body.Data)
+					}
+				//case btrfsitem.DIR_LOG_INDEX_KEY, btrfsitem.DIR_LOG_ITEM_KEY:
+				//	// TODO
+				case btrfsitem.Root:
+					fmt.Fprintf(out, "\t\tgeneration %v root_dirid %v bytenr %d byte_limit %v bytes_used %v\n",
+						body.Generation, body.RootDirID, body.ByteNr, body.ByteLimit, body.BytesUsed)
+					fmt.Fprintf(out, "\t\tlast_snapshot %v flags %v refs %v\n",
+						body.LastSnapshot, body.Flags, body.Refs)
+					fmt.Fprintf(out, "\t\tdrop_progress %v drop_level %v\n",
+						fmtKey(body.DropProgress), body.DropLevel)
+					fmt.Fprintf(out, "\t\tlevel %v generation_v2 %v\n",
+						body.Level, body.GenerationV2)
+					if body.Generation == body.GenerationV2 {
+						fmt.Fprintf(out, "\t\tuuid %v\n", body.UUID)
+						fmt.Fprintf(out, "\t\tparent_uuid %v\n", body.ParentUUID)
+						fmt.Fprintf(out, "\t\treceived_uuid %v\n", body.ReceivedUUID)
+						fmt.Fprintf(out, "\t\tctransid %v otransid %v stransid %v rtransid %v\n",
+							body.CTransID, body.OTransID, body.STransID, body.RTransID)
+						fmt.Fprintf(out, "\t\tctime %v\n", fmtTime(body.CTime))
+						fmt.Fprintf(out, "\t\totime %v\n", fmtTime(body.OTime))
+						fmt.Fprintf(out, "\t\tstime %v\n", fmtTime(body.STime))
+						fmt.Fprintf(out, "\t\trtime %v\n", fmtTime(body.RTime))
+					}
+				case btrfsitem.RootRef:
+					var tag string
+					switch item.Head.Key.ItemType {
+					case btrfsitem.ROOT_REF_KEY:
+						tag = "ref"
+					case btrfsitem.ROOT_BACKREF_KEY:
+						tag = "backref"
+					default:
+						tag = fmt.Sprintf("(error: unhandled RootRef item type: %v)", item.Head.Key.ItemType)
+					}
+					fmt.Fprintf(out, "\t\troot %v key dirid %v sequence %v name %s\n",
+						tag, body.DirID, body.Sequence, body.Name)
+				case btrfsitem.Extent:
+					fmt.Fprintf(out, "\t\trefs %v gen %v flags %v\n",
+						body.Head.Refs, body.Head.Generation, body.Head.Flags)
+					if body.Head.Flags.Has(btrfsitem.EXTENT_FLAG_TREE_BLOCK) {
+						fmt.Fprintf(out, "\t\ttree block %v level %v\n",
+							fmtKey(body.Info.Key), body.Info.Level)
+					}
+					printExtentInlineRefs(out, body.Refs)
+				case btrfsitem.Metadata:
+					fmt.Fprintf(out, "\t\trefs %v gen %v flags %v\n",
+						body.Head.Refs, body.Head.Generation, body.Head.Flags)
+					fmt.Fprintf(out, "\t\ttree block skinny level %v\n", item.Head.Key.Offset)
+					printExtentInlineRefs(out, body.Refs)
+				//case btrfsitem.EXTENT_DATA_REF_KEY:
+				//	// TODO
+				//case btrfsitem.SHARED_DATA_REF_KEY:
+				//	// TODO
+				case btrfsitem.ExtentCSum:
+					sb, _ := fs.Superblock()
+					sectorSize := btrfsvol.AddrDelta(sb.Data.SectorSize)
 
-				start := btrfsvol.LogicalAddr(item.Head.Key.Offset)
-				itemSize := btrfsvol.AddrDelta(len(body.Sums)) * sectorSize
-				fmt.Fprintf(out, "\t\trange start %d end %d length %d",
-					start, start.Add(itemSize), itemSize)
-				sumsPerLine := util.Max(1, len(btrfssum.CSum{})/body.ChecksumSize/2)
+					start := btrfsvol.LogicalAddr(item.Head.Key.Offset)
+					itemSize := btrfsvol.AddrDelta(len(body.Sums)) * sectorSize
+					fmt.Fprintf(out, "\t\trange start %d end %d length %d",
+						start, start.Add(itemSize), itemSize)
+					sumsPerLine := util.Max(1, len(btrfssum.CSum{})/body.ChecksumSize/2)
 
-				pos := start
-				for i, sum := range body.Sums {
-					if i%sumsPerLine == 0 {
-						fmt.Fprintf(out, "\n\t\t")
-					} else {
-						fmt.Fprintf(out, " ")
+					pos := start
+					for i, sum := range body.Sums {
+						if i%sumsPerLine == 0 {
+							fmt.Fprintf(out, "\n\t\t")
+						} else {
+							fmt.Fprintf(out, " ")
+						}
+						fmt.Fprintf(out, "[%d] 0x%s", pos, sum.Fmt(sb.Data.ChecksumType))
+						pos = pos.Add(sectorSize)
 					}
-					fmt.Fprintf(out, "[%d] 0x%s", pos, sum.Fmt(sb.Data.ChecksumType))
-					pos = pos.Add(sectorSize)
-				}
-				fmt.Fprintf(out, "\n")
-			case btrfsitem.FileExtent:
-				fmt.Fprintf(out, "\t\tgeneration %v type %v\n",
-					body.Generation, body.Type)
-				switch body.Type {
-				case btrfsitem.FILE_EXTENT_INLINE:
-					fmt.Fprintf(out, "\t\tinline extent data size %v ram_bytes %v compression %v\n",
-						len(body.BodyInline), body.RAMBytes, body.Compression)
-				case btrfsitem.FILE_EXTENT_PREALLOC:
-					fmt.Fprintf(out, "\t\tprealloc data disk byte %v nr %v\n",
-						body.BodyExtent.DiskByteNr,
-						body.BodyExtent.DiskNumBytes)
-					fmt.Fprintf(out, "\t\tprealloc data offset %v nr %v\n",
-						body.BodyExtent.Offset,
-						body.BodyExtent.NumBytes)
-				case btrfsitem.FILE_EXTENT_REG:
-					fmt.Fprintf(out, "\t\textent data disk byte %d nr %d\n",
-						body.BodyExtent.DiskByteNr,
-						body.BodyExtent.DiskNumBytes)
-					fmt.Fprintf(out, "\t\textent data offset %d nr %d ram %v\n",
-						body.BodyExtent.Offset,
-						body.BodyExtent.NumBytes,
-						body.RAMBytes)
-					fmt.Fprintf(out, "\t\textent compression %v\n",
-						body.Compression)
-				default:
-					fmt.Fprintf(out, "\t\t(error) unknown file extent type %v", body.Type)
-				}
-			case btrfsitem.BlockGroup:
-				fmt.Fprintf(out, "\t\tblock group used %v chunk_objectid %v flags %v\n",
-					body.Used, body.ChunkObjectID, body.Flags)
-			case btrfsitem.FreeSpaceInfo:
-				fmt.Fprintf(out, "\t\tfree space info extent count %v flags %v\n",
-					body.ExtentCount, body.Flags)
-			case btrfsitem.FreeSpaceBitmap:
-				fmt.Fprintf(out, "\t\tfree space bitmap\n")
-			case btrfsitem.Chunk:
-				fmt.Fprintf(out, "\t\tlength %d owner %d stripe_len %v type %v\n",
-					body.Head.Size, body.Head.Owner, body.Head.StripeLen, body.Head.Type)
-				fmt.Fprintf(out, "\t\tio_align %v io_width %v sector_size %v\n",
-					body.Head.IOOptimalAlign, body.Head.IOOptimalWidth, body.Head.IOMinSize)
-				fmt.Fprintf(out, "\t\tnum_stripes %v sub_stripes %v\n",
-					body.Head.NumStripes, body.Head.SubStripes)
-				for i, stripe := range body.Stripes {
-					fmt.Fprintf(out, "\t\t\tstripe %v devid %d offset %d\n",
-						i, stripe.DeviceID, stripe.Offset)
-					fmt.Fprintf(out, "\t\t\tdev_uuid %v\n",
-						stripe.DeviceUUID)
-				}
-			case btrfsitem.Dev:
-				fmt.Fprintf(out, ""+
-					"\t\tdevid %d total_bytes %v bytes_used %v\n"+
-					"\t\tio_align %v io_width %v sector_size %v type %v\n"+
-					"\t\tgeneration %v start_offset %v dev_group %v\n"+
-					"\t\tseek_speed %v bandwidth %v\n"+
-					"\t\tuuid %v\n"+
-					"\t\tfsid %v\n",
-					body.DevID, body.NumBytes, body.NumBytesUsed,
-					body.IOOptimalAlign, body.IOOptimalWidth, body.IOMinSize, body.Type,
-					body.Generation, body.StartOffset, body.DevGroup,
-					body.SeekSpeed, body.Bandwidth,
-					body.DevUUID,
-					body.FSUUID)
-			case btrfsitem.DevExtent:
-				fmt.Fprintf(out, ""+
-					"\t\tdev extent chunk_tree %v\n"+
-					"\t\tchunk_objectid %v chunk_offset %d length %d\n"+
-					"\t\tchunk_tree_uuid %v\n",
-					body.ChunkTree, body.ChunkObjectID, body.ChunkOffset, body.Length,
-					body.ChunkTreeUUID)
-			//case btrfsitem.QGROUP_STATUS_KEY:
-			//	// TODO
-			//case btrfsitem.QGROUP_INFO_KEY:
-			//	// TODO
-			//case btrfsitem.QGROUP_LIMIT_KEY:
-			//	// TODO
-			case btrfsitem.UUIDMap:
-				fmt.Fprintf(out, "\t\tsubvol_id %d\n", body.ObjID)
-			//case btrfsitem.STRING_ITEM_KEY:
-			//	// TODO
-			case btrfsitem.DevStats:
-				fmt.Fprintf(out, "\t\tpersistent item objectid %v offset %v\n",
-					item.Head.Key.ObjectID.Format(item.Head.Key.ItemType), item.Head.Key.Offset)
-				switch item.Head.Key.ObjectID {
-				case btrfs.DEV_STATS_OBJECTID:
-					fmt.Fprintf(out, "\t\tdevice stats\n")
-					fmt.Fprintf(out, "\t\twrite_errs %v read_errs %v flush_errs %v corruption_errs %v generation %v\n",
-						body.Values[btrfsitem.DEV_STAT_WRITE_ERRS],
-						body.Values[btrfsitem.DEV_STAT_READ_ERRS],
-						body.Values[btrfsitem.DEV_STAT_FLUSH_ERRS],
-						body.Values[btrfsitem.DEV_STAT_CORRUPTION_ERRS],
-						body.Values[btrfsitem.DEV_STAT_GENERATION_ERRS])
-				default:
-					fmt.Fprintf(out, "\t\tunknown persistent item objectid %v\n", item.Head.Key.ObjectID)
-				}
-			//case btrfsitem.TEMPORARY_ITEM_KEY:
-			//	// TODO
-			case btrfsitem.Empty:
-				switch item.Head.Key.ItemType {
-				case btrfsitem.ORPHAN_ITEM_KEY: // 48
-					fmt.Fprintf(out, "\t\torphan item\n")
-				case btrfsitem.TREE_BLOCK_REF_KEY: // 176
-					fmt.Fprintf(out, "\t\ttree block backref\n")
-				case btrfsitem.SHARED_BLOCK_REF_KEY: // 182
-					fmt.Fprintf(out, "\t\tshared block backref\n")
-				case btrfsitem.FREE_SPACE_EXTENT_KEY: // 199
-					fmt.Fprintf(out, "\t\tfree space extent\n")
-				case btrfsitem.QGROUP_RELATION_KEY: // 246
-					// do nothing
-				//case btrfsitem.EXTENT_REF_V0_KEY:
-				//	fmt.Fprintf(out, "\t\textent ref v0 (deprecated)\n")
-				//case btrfsitem.CSUM_ITEM_KEY:
-				//	fmt.Fprintf(out, "\t\tcsum item\n")
+					fmt.Fprintf(out, "\n")
+				case btrfsitem.FileExtent:
+					fmt.Fprintf(out, "\t\tgeneration %v type %v\n",
+						body.Generation, body.Type)
+					switch body.Type {
+					case btrfsitem.FILE_EXTENT_INLINE:
+						fmt.Fprintf(out, "\t\tinline extent data size %v ram_bytes %v compression %v\n",
+							len(body.BodyInline), body.RAMBytes, body.Compression)
+					case btrfsitem.FILE_EXTENT_PREALLOC:
+						fmt.Fprintf(out, "\t\tprealloc data disk byte %v nr %v\n",
+							body.BodyExtent.DiskByteNr,
+							body.BodyExtent.DiskNumBytes)
+						fmt.Fprintf(out, "\t\tprealloc data offset %v nr %v\n",
+							body.BodyExtent.Offset,
+							body.BodyExtent.NumBytes)
+					case btrfsitem.FILE_EXTENT_REG:
+						fmt.Fprintf(out, "\t\textent data disk byte %d nr %d\n",
+							body.BodyExtent.DiskByteNr,
+							body.BodyExtent.DiskNumBytes)
+						fmt.Fprintf(out, "\t\textent data offset %d nr %d ram %v\n",
+							body.BodyExtent.Offset,
+							body.BodyExtent.NumBytes,
+							body.RAMBytes)
+						fmt.Fprintf(out, "\t\textent compression %v\n",
+							body.Compression)
+					default:
+						fmt.Fprintf(out, "\t\t(error) unknown file extent type %v", body.Type)
+					}
+				case btrfsitem.BlockGroup:
+					fmt.Fprintf(out, "\t\tblock group used %v chunk_objectid %v flags %v\n",
+						body.Used, body.ChunkObjectID, body.Flags)
+				case btrfsitem.FreeSpaceInfo:
+					fmt.Fprintf(out, "\t\tfree space info extent count %v flags %v\n",
+						body.ExtentCount, body.Flags)
+				case btrfsitem.FreeSpaceBitmap:
+					fmt.Fprintf(out, "\t\tfree space bitmap\n")
+				case btrfsitem.Chunk:
+					fmt.Fprintf(out, "\t\tlength %d owner %d stripe_len %v type %v\n",
+						body.Head.Size, body.Head.Owner, body.Head.StripeLen, body.Head.Type)
+					fmt.Fprintf(out, "\t\tio_align %v io_width %v sector_size %v\n",
+						body.Head.IOOptimalAlign, body.Head.IOOptimalWidth, body.Head.IOMinSize)
+					fmt.Fprintf(out, "\t\tnum_stripes %v sub_stripes %v\n",
+						body.Head.NumStripes, body.Head.SubStripes)
+					for i, stripe := range body.Stripes {
+						fmt.Fprintf(out, "\t\t\tstripe %v devid %d offset %d\n",
+							i, stripe.DeviceID, stripe.Offset)
+						fmt.Fprintf(out, "\t\t\tdev_uuid %v\n",
+							stripe.DeviceUUID)
+					}
+				case btrfsitem.Dev:
+					fmt.Fprintf(out, ""+
+						"\t\tdevid %d total_bytes %v bytes_used %v\n"+
+						"\t\tio_align %v io_width %v sector_size %v type %v\n"+
+						"\t\tgeneration %v start_offset %v dev_group %v\n"+
+						"\t\tseek_speed %v bandwidth %v\n"+
+						"\t\tuuid %v\n"+
+						"\t\tfsid %v\n",
+						body.DevID, body.NumBytes, body.NumBytesUsed,
+						body.IOOptimalAlign, body.IOOptimalWidth, body.IOMinSize, body.Type,
+						body.Generation, body.StartOffset, body.DevGroup,
+						body.SeekSpeed, body.Bandwidth,
+						body.DevUUID,
+						body.FSUUID)
+				case btrfsitem.DevExtent:
+					fmt.Fprintf(out, ""+
+						"\t\tdev extent chunk_tree %v\n"+
+						"\t\tchunk_objectid %v chunk_offset %d length %d\n"+
+						"\t\tchunk_tree_uuid %v\n",
+						body.ChunkTree, body.ChunkObjectID, body.ChunkOffset, body.Length,
+						body.ChunkTreeUUID)
+				//case btrfsitem.QGROUP_STATUS_KEY:
+				//	// TODO
+				//case btrfsitem.QGROUP_INFO_KEY:
+				//	// TODO
+				//case btrfsitem.QGROUP_LIMIT_KEY:
+				//	// TODO
+				case btrfsitem.UUIDMap:
+					fmt.Fprintf(out, "\t\tsubvol_id %d\n", body.ObjID)
+				//case btrfsitem.STRING_ITEM_KEY:
+				//	// TODO
+				case btrfsitem.DevStats:
+					fmt.Fprintf(out, "\t\tpersistent item objectid %v offset %v\n",
+						item.Head.Key.ObjectID.Format(item.Head.Key.ItemType), item.Head.Key.Offset)
+					switch item.Head.Key.ObjectID {
+					case btrfs.DEV_STATS_OBJECTID:
+						fmt.Fprintf(out, "\t\tdevice stats\n")
+						fmt.Fprintf(out, "\t\twrite_errs %v read_errs %v flush_errs %v corruption_errs %v generation %v\n",
+							body.Values[btrfsitem.DEV_STAT_WRITE_ERRS],
+							body.Values[btrfsitem.DEV_STAT_READ_ERRS],
+							body.Values[btrfsitem.DEV_STAT_FLUSH_ERRS],
+							body.Values[btrfsitem.DEV_STAT_CORRUPTION_ERRS],
+							body.Values[btrfsitem.DEV_STAT_GENERATION_ERRS])
+					default:
+						fmt.Fprintf(out, "\t\tunknown persistent item objectid %v\n", item.Head.Key.ObjectID)
+					}
+				//case btrfsitem.TEMPORARY_ITEM_KEY:
+				//	// TODO
+				case btrfsitem.Empty:
+					switch item.Head.Key.ItemType {
+					case btrfsitem.ORPHAN_ITEM_KEY: // 48
+						fmt.Fprintf(out, "\t\torphan item\n")
+					case btrfsitem.TREE_BLOCK_REF_KEY: // 176
+						fmt.Fprintf(out, "\t\ttree block backref\n")
+					case btrfsitem.SHARED_BLOCK_REF_KEY: // 182
+						fmt.Fprintf(out, "\t\tshared block backref\n")
+					case btrfsitem.FREE_SPACE_EXTENT_KEY: // 199
+						fmt.Fprintf(out, "\t\tfree space extent\n")
+					case btrfsitem.QGROUP_RELATION_KEY: // 246
+						// do nothing
+					//case btrfsitem.EXTENT_REF_V0_KEY:
+					//	fmt.Fprintf(out, "\t\textent ref v0 (deprecated)\n")
+					//case btrfsitem.CSUM_ITEM_KEY:
+					//	fmt.Fprintf(out, "\t\tcsum item\n")
+					default:
+						fmt.Fprintf(out, "\t\t(error) unhandled empty item type: %v\n", item.Head.Key.ItemType)
+					}
+				case btrfsitem.Error:
+					fmt.Fprintf(out, "\t\t(error) error item: %v\n", body.Err)
 				default:
-					fmt.Fprintf(out, "\t\t(error) unhandled empty item type: %v\n", item.Head.Key.ItemType)
+					fmt.Fprintf(out, "\t\t(error) unhandled item type: %T\n", body)
 				}
-			case btrfsitem.Error:
-				fmt.Fprintf(out, "\t\t(error) error item: %v\n", body.Err)
-			default:
-				fmt.Fprintf(out, "\t\t(error) unhandled item type: %T\n", body)
-			}
-			return nil
+				return nil
+			},
 		},
-	})
+	)
 }
 
 // printHeaderInfo mimics btrfs-progs kernel-shared/print-tree.c:print_header_info()