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package main
import (
"fmt"
"os"
"strings"
"lukeshu.com/btrfs-tools/pkg/binstruct"
"lukeshu.com/btrfs-tools/pkg/btrfs"
)
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)
}
}
const version = "5.17"
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,
},
},
}
if err := fs.Init(); err != nil {
return err
}
superblock, err := fs.Superblock()
if err != nil {
return err
}
fmt.Printf("btrfs-progs v%s \n", version)
if superblock.Data.RootTree != 0 {
fmt.Printf("root tree\n")
printTree(fs, superblock.Data.RootTree)
}
if superblock.Data.ChunkTree != 0 {
fmt.Printf("chunk tree\n")
printTree(fs, superblock.Data.ChunkTree)
}
if superblock.Data.LogTree != 0 {
fmt.Printf("log root tree\n")
printTree(fs, superblock.Data.LogTree)
}
if superblock.Data.BlockGroupRoot != 0 {
fmt.Printf("block group tree\n")
printTree(fs, superblock.Data.BlockGroupRoot)
}
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(fs *btrfs.FS, root btrfs.LogicalAddr) {
node, err := fs.ReadNode(root)
if err != nil {
fmt.Printf("error: %v\n", err)
return
}
printHeaderInfo(node)
switch node := node.(type) {
case *btrfs.InternalNode:
for _, item := range node.Body {
fmt.Printf("\t%s block %d gen %d\n",
fmtKey(item.Data.Key),
item.Data.BlockPtr,
item.Data.Generation)
}
for _, item := range node.Body {
printTree(fs, item.Data.BlockPtr)
}
case *btrfs.LeafNode:
for i, item := range node.Body {
fmt.Printf("\titem %d %s itemoff %d itemsize %d\n",
i,
fmtKey(item.Data.Key),
item.Data.DataOffset,
item.Data.DataSize)
switch item.Data.Key.ItemType {
case btrfs.BTRFS_UNTYPED_KEY:
// TODO
case btrfs.BTRFS_INODE_ITEM_KEY:
// TODO(!)
case btrfs.BTRFS_INODE_REF_KEY:
dat := item.Data.Data.Data
for len(dat) > 0 {
var ref btrfs.InodeRefItem
if err := binstruct.Unmarshal(dat, &ref); err != nil {
fmt.Printf("error: %v\n", err)
return
}
dat = dat[0xA:]
ref.Name = dat[:ref.NameLen]
dat = dat[ref.NameLen:]
fmt.Printf("\t\tindex %d namelen %d name: %s\n",
ref.Index, ref.NameLen, ref.Name)
}
case btrfs.BTRFS_INODE_EXTREF_KEY:
// TODO
case btrfs.BTRFS_DIR_ITEM_KEY, btrfs.BTRFS_DIR_INDEX_KEY, btrfs.BTRFS_XATTR_ITEM_KEY:
// TODO
case btrfs.BTRFS_DIR_LOG_INDEX_KEY, btrfs.BTRFS_DIR_LOG_ITEM_KEY:
// TODO
case btrfs.BTRFS_ORPHAN_ITEM_KEY:
fmt.Printf("\t\torphan item\n")
case btrfs.BTRFS_ROOT_ITEM_KEY:
var obj btrfs.RootItem
if err := binstruct.Unmarshal(item.Data.Data.Data, &obj); err != nil {
fmt.Printf("error: %v\n", err)
return
}
fmt.Printf("\t\tgeneration %d root_dirid %d bytenr %d byte_limit %d bytes_used %d\n",
obj.Generation, obj.RootDirID, obj.ByteNr, obj.ByteLimit, obj.BytesUsed)
fmt.Printf("\t\tlast_snapshot %d flags %s refs %d\n",
obj.LastSnapshot, obj.Flags, obj.Refs)
fmt.Printf("\t\tdrop_progress %s drop_level %d\n",
fmtKey(obj.DropProgress), obj.DropLevel)
fmt.Printf("\t\tlevel %d generation_v2 %d\n",
obj.Level, obj.GenerationV2)
if obj.Generation == obj.GenerationV2 {
fmt.Printf("\t\tuuid %s\n", obj.UUID)
fmt.Printf("\t\tparent_uuid %s\n", obj.ParentUUID)
fmt.Printf("\t\treceived_uuid %s\n", obj.ReceivedUUID)
fmt.Printf("\t\tctransid %d otransid %d stransid %d rtransid %d\n",
obj.CTransID, obj.OTransID, obj.STransID, obj.RTransID)
fmt.Printf("\t\tctime %s\n", fmtTime(obj.CTime))
fmt.Printf("\t\totime %s\n", fmtTime(obj.OTime))
fmt.Printf("\t\tstime %s\n", fmtTime(obj.STime))
fmt.Printf("\t\trtime %s\n", fmtTime(obj.RTime))
}
case btrfs.BTRFS_ROOT_REF_KEY:
// TODO
case btrfs.BTRFS_ROOT_BACKREF_KEY:
// TODO
case btrfs.BTRFS_EXTENT_ITEM_KEY:
// TODO
case btrfs.BTRFS_METADATA_ITEM_KEY:
// TODO
case btrfs.BTRFS_TREE_BLOCK_REF_KEY:
fmt.Printf("\t\ttree block backref\n")
case btrfs.BTRFS_SHARED_BLOCK_REF_KEY:
fmt.Printf("\t\tshared block backref\n")
case btrfs.BTRFS_EXTENT_DATA_REF_KEY:
// TODO
case btrfs.BTRFS_SHARED_DATA_REF_KEY:
// TODO
case btrfs.BTRFS_EXTENT_REF_V0_KEY:
fmt.Printf("\t\textent ref v0 (deprecated)\n")
case btrfs.BTRFS_CSUM_ITEM_KEY:
fmt.Printf("\t\tcsum item\n")
case btrfs.BTRFS_EXTENT_CSUM_KEY:
// TODO
case btrfs.BTRFS_EXTENT_DATA_KEY:
// TODO
case btrfs.BTRFS_BLOCK_GROUP_ITEM_KEY:
// TODO
case btrfs.BTRFS_FREE_SPACE_INFO_KEY:
// TODO
case btrfs.BTRFS_FREE_SPACE_EXTENT_KEY:
fmt.Printf("\t\tfree space extent\n")
case btrfs.BTRFS_FREE_SPACE_BITMAP_KEY:
fmt.Printf("\t\tfree space bitmap\n")
case btrfs.BTRFS_CHUNK_ITEM_KEY:
// TODO(!)
case btrfs.BTRFS_DEV_ITEM_KEY:
// TODO
case btrfs.BTRFS_DEV_EXTENT_KEY:
// TODO
case btrfs.BTRFS_QGROUP_STATUS_KEY:
// TODO
case btrfs.BTRFS_QGROUP_RELATION_KEY, btrfs.BTRFS_QGROUP_INFO_KEY:
// TODO
case btrfs.BTRFS_QGROUP_LIMIT_KEY:
// TODO
case btrfs.BTRFS_UUID_KEY_SUBVOL, btrfs.BTRFS_UUID_KEY_RECEIVED_SUBVOL:
// TODO
case btrfs.BTRFS_STRING_ITEM_KEY:
// TODO
case btrfs.BTRFS_PERSISTENT_ITEM_KEY:
// TODO
case btrfs.BTRFS_TEMPORARY_ITEM_KEY:
// TODO
}
}
}
}
// printHeaderInfo mimics btrfs-progs kernel-shared/print-tree.c:print_header_info()
func printHeaderInfo(node btrfs.Node) {
var typename string
switch node := node.(type) {
case *btrfs.InternalNode:
typename = "node"
fmt.Printf("node %d level %d items %d free space %d",
node.Header.Addr,
node.Header.Data.Level,
node.Header.Data.NumItems,
node.Header.Data.MaxItems-node.Header.Data.NumItems)
case *btrfs.LeafNode:
typename = "leaf"
fmt.Printf("leaf %d items %d free space %d",
node.Header.Addr,
node.Header.Data.NumItems,
node.FreeSpace())
}
fmt.Printf(" generation %d owner %v\n",
node.GetNodeHeader().Data.Generation,
node.GetNodeHeader().Data.Owner)
fmt.Printf("%s %d flags %s backref revision %d\n",
typename,
node.GetNodeHeader().Addr,
node.GetNodeHeader().Data.Flags,
node.GetNodeHeader().Data.BackrefRev)
fmt.Printf("checksum stored %x\n", node.GetNodeHeader().Data.Checksum)
fmt.Printf("checksum calced %v\n", "TODO")
fmt.Printf("fs uuid %s\n", node.GetNodeHeader().Data.MetadataUUID)
fmt.Printf("chunk uuid %s\n", node.GetNodeHeader().Data.ChunkTreeUUID)
}
// mimics print-tree.c:btrfs_print_key()
func fmtKey(key btrfs.Key) string {
var out strings.Builder
fmt.Fprintf(&out, "key (%s %v", key.ObjectID.Format(key.ItemType), key.ItemType)
switch key.ItemType {
case btrfs.BTRFS_QGROUP_RELATION_KEY, btrfs.BTRFS_QGROUP_INFO_KEY, btrfs.BTRFS_QGROUP_LIMIT_KEY:
panic("not implemented")
case btrfs.BTRFS_UUID_KEY_SUBVOL, btrfs.BTRFS_UUID_KEY_RECEIVED_SUBVOL:
fmt.Fprintf(&out, " 0x%016x)", key.Offset)
case btrfs.BTRFS_ROOT_ITEM_KEY:
fmt.Fprintf(&out, " %v)", btrfs.ObjID(key.Offset))
default:
if key.Offset == btrfs.MaxUint64pp-1 {
fmt.Fprintf(&out, " -1)")
} else {
fmt.Fprintf(&out, " %d)", key.Offset)
}
}
return out.String()
}
func fmtTime(t btrfs.Time) string {
return fmt.Sprintf("%d.%d (%s)",
t.Sec, t.NSec, t.ToStd().Format("2006-01-02 15:04:05"))
}
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