Meet Alice - the 16KB "write" that could

• Alice is an ordinary write to a file on a file-system.
• Alice could be an attempt to write on an allocated part of the file...
• ...or an attempt to write to an un-allocated part.
• Alice could be a synced operation - waiting until she gets to disk-haven...
• ...or an un-synced operation - getting into the page cache is enough.

Originally written by guy keren