Reading The Contents Of A Directory

If we'll just stop here, we'll get a system crash in the first "ls" to the root directory - we want to be able to read the contents of the root directory, and this requires a file-operation named readdir, implemented in stamfs_readdir():

• Make sure the file "read-head" position is not located past the last entry in the directory (for a large dir, we only return part of it, and the user will perform another readdir to read the next chunk, etc.).
• If we're at the first position, insert info about directory '.' (we don't keep it on disk).
• If we're at the second position, insert info about directory '..' (we don't keep it on disk).
• Read the directory's data block from disk.
• As long as there's space in the user's buffer, scan the list of files and add them to the user's buffer.
• Update the last access-time of the directory.

Originally written by guy keren