1. A non-transitory computer-readable storage medium storing computer-executable instructions that when executed by a computer cause the computer to perform a method, the method comprising: accessing a file system comprising a set of files and metadata concerning members of the set of files, where the metadata includes a set of inodes, accessing a copy on write data store; in a traversal of a data structure that organizes the file system, identifying an error to be repaired in the file system; writing a repair data to the copy on write data store, where the repair data comprises information concerning a fix for the error, and selectively updating the file system using the repair data stored in the copy on write data store.