[vdr] Re: "sparse-copy" ?

[Jon Burgess <mplayer@jburgess.uklinux.net>]

Guido Fiala wrote:

> Such a filesystem would be nice for any kind of video-editing...
>  
This could be achieved today in userspace. The first thing that you 
would want to do do is make the "nnn.vdr" files a lot smaller, 
containing a few minutes of data each.

When you "copy" the recording you simply create a hard link to each of 
the complete blocks and create new files for the partial bocks around 
each of the cut points. The filesystem will take care of doing the 
reference counting for you so you can safely delete the primary 
recording without losing any of the referenced blocks.

There would be a few limitations with this approach of using hard links. 
The filesystem would have to unserstand hard links (no more FAT 
recordings). The "copy" would have to reside on the same filesystems as 
the original recording. You also need to be careful when backing up the 
file system, tools like "cp" will duplicate the hard linked data.

   Jon



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