1. A method of identifying metadata referenced by a quota tree, the method comprising: accessing a quota tree metafile that includes references to locations of inode grouped data structures associated with quota trees, each quota tree being allocated an inode grouped data structure; identifying, from the quota tree metafile, a reference to a location of an inode grouped data structure that is allocated to the quota tree; accessing the inode grouped data structure based on the reference, the inode grouped data structure defining a set of inode identifiers associated with the quota tree; and locating the metadata using the set of inode identifiers as an index.