Re: Null files reloaded :-)

[Chris Wedgwood <cw@xxxxxxxx>]

On Tue, Jul 20, 2004 at 07:20:59PM +0100, Ricardo Correia wrote:

> 1 - File A is safe on disk
> 2 - Process writes file B (metadata on disk, file data in RAM)
> 3 - Process renames B to A

A is gone, the metadata pointing to it is lost.

> 4 - Periodic disk sync (every 5 seconds or so?)

> Now if power failure occurs after 3, but before 4.. isn't the inode
> and content of A still on disk?

yes, but we don't know where

> And isn't the directory still pointing to the inode of A? I thought
> metadata at this point was only written to the journal.

it is, this means the rename and freeing of disk-blocks for A



  --cw