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package btrfsmisc
import (
"errors"
"fmt"
"lukeshu.com/btrfs-tools/pkg/btrfs"
"lukeshu.com/btrfs-tools/pkg/util"
)
// ScanForNodes mimics btrfs-progs
// cmds/rescue-chunk-recover.c:scan_one_device(), except rather than
// doing something itself when it finds a node, it simply calls a
// callback function.
func ScanForNodes(dev *btrfs.Device, sb btrfs.Superblock, fn func(*util.Ref[btrfs.PhysicalAddr, btrfs.Node], error), prog func(btrfs.PhysicalAddr)) error {
devSize, err := dev.Size()
if err != nil {
return err
}
if sb.NodeSize < sb.SectorSize {
return fmt.Errorf("node_size(%v) < sector_size(%v)",
sb.NodeSize, sb.SectorSize)
}
for pos := btrfs.PhysicalAddr(0); pos+btrfs.PhysicalAddr(sb.NodeSize) < devSize; pos += btrfs.PhysicalAddr(sb.SectorSize) {
if util.InSlice(pos, btrfs.SuperblockAddrs) {
//fmt.Printf("sector@%v is a superblock\n", pos)
continue
}
if prog != nil {
prog(pos)
}
nodeRef, err := btrfs.ReadNode[btrfs.PhysicalAddr](dev, sb, pos, nil)
if err != nil && errors.Is(err, btrfs.ErrNotANode) {
continue
}
fn(nodeRef, err)
pos += btrfs.PhysicalAddr(sb.NodeSize) - btrfs.PhysicalAddr(sb.SectorSize)
}
if prog != nil {
prog(devSize)
}
return nil
}
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