func (c *FileSystemConnector) Lookup(out *raw.EntryOut, header *raw.InHeader, name string) (code Status) {
parent := c.toInode(header.NodeId)
if !parent.IsDir() {
log.Printf("Lookup %q called on non-Directory node %d", name, header.NodeId)
return ENOTDIR
}
context := (*Context)(&header.Context)
outAttr := (*Attr)(&out.Attr)
child, code := c.internalLookup(outAttr, parent, name, context)
if code == ENOENT && parent.mount.negativeEntry(out) {
return OK
}
if !code.Ok() {
return code
}
if child == nil {
log.Println("Lookup returned OK with nil child", name)
}
child.mount.fillEntry(out)
out.NodeId = c.lookupUpdate(child)
out.Generation = child.generation
out.Ino = out.NodeId
return OK
}
// Creates a return entry for a non-existent path.
func (m *fileSystemMount) negativeEntry(out *raw.EntryOut) bool {
if m.options.NegativeTimeout > 0.0 {
out.NodeId = 0
splitDuration(m.options.NegativeTimeout, &out.EntryValid, &out.EntryValidNsec)
return true
}
return false
}
// Generate EntryOut and increase the lookup count for an inode.
func (c *FileSystemConnector) childLookup(out *raw.EntryOut, fsi FsNode) {
n := fsi.Inode()
fsi.GetAttr((*Attr)(&out.Attr), nil, nil)
n.mount.fillEntry(out)
out.Ino = c.lookupUpdate(n)
out.NodeId = out.Ino
if out.Nlink == 0 {
// With Nlink == 0, newer kernels will refuse link
// operations.
out.Nlink = 1
}
}