Recursive function which finds and locks the leaf page in the B+ tree corresponding to the left-most page possibly containing the key field f. It locks all internal nodes along the path to the leaf node with READ_ONLY permission, and locks the leaf node with permission perm. If f is null, it finds
(TransactionId tid, HashMap<PageId, Page> dirtypages, BTreePageId pid, Permissions perm, Field f)
source not stored for this graph (policy: none)
no outgoing calls
no test coverage detected