mount: ensure symlink parent directory is tracked

fix https://github.com/chrislusf/seaweedfs/issues/3373

weed/mount/inode_to_path.go

@@ -5,6 +5,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/hanwen/go-fuse/v2/fuse"
 	"sync"
+	"time"
 )
 
 type InodeToPath struct {
@@ -52,6 +53,20 @@ func NewInodeToPath(root util.FullPath) *InodeToPath {
 	return t
 }
 
+// EnsurePath make sure the full path is tracked, used by symlink.
+func (i *InodeToPath) EnsurePath(path util.FullPath, isDirectory bool) bool {
+	for {
+		dir, _ := path.DirAndName()
+		if dir == "/" {
+			return true
+		}
+		if i.EnsurePath(util.FullPath(dir), true) {
+			i.Lookup(path, time.Now().Unix(), isDirectory, false, 0, false)
+		}
+	}
+	return false
+}
+
 func (i *InodeToPath) Lookup(path util.FullPath, unixTime int64, isDirectory bool, isHardlink bool, possibleInode uint64, isLookup bool) uint64 {
 	i.Lock()
 	defer i.Unlock()

weed/mount/weedfs.go

@@ -144,8 +144,10 @@ func (wfs *WFS) maybeReadEntry(inode uint64, followSymLink bool) (path util.Full
 		if entry != nil && entry.Attributes != nil && entry.Attributes.Inode != 0 {
 			targetInode = entry.Attributes.Inode
 		}
-		target := filepath.Join(string(path), "../"+entry.Attributes.SymlinkTarget)
-		entry, status = wfs.maybeLoadEntry(util.FullPath(target))
+		target := util.FullPath(filepath.Join(string(path), "../"+entry.Attributes.SymlinkTarget))
+		targetParent, _ := target.DirAndName()
+		wfs.inodeToPath.EnsurePath(util.FullPath(targetParent), true)
+		entry, status = wfs.maybeLoadEntry(target)
 	}
 	return
 }