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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
}
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