Filesystem format for external hard disk

[Bryn M. Reeves]

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On 06/01/2012 01:14 PM, Alan Cox wrote:
>> Aside from some clear performance wins for not-that-uncommon 
>> workloads (deleting lots of large files, storing large images 
>> etc) there's the fact that most of the attention upstream these 
>> days is going into ext4 - - the earlier ext* file systems are 
>> pretty much in maintenance mode today.
> 
> You are also generally going to be using the ext4 code for ext3 
> file systems.

I thought there were some pretty big differences? E.g. jbd/jbd2,
dellaloc improvements only in ext4, metadata performance improvements etc.

Just looking at balloc.c in git I see ~2500 changed lines.

Or is the ext4 code able to mount ext3 now (I didn't think so)?

Regards,
Bryn.
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