Re: ext4 features

[Bill Davidsen]

Theodore Tso wrote:
> On Sat, Jul 01, 2006 at 06:33:01PM +0200, Thomas Glanzmann wrote:
> > I would like to know which new features are planed to be incorported by
> > ext4. So far I only read about supporting bigger filesystems to fit
> > recent hardware developments. So are there any other big goals for ext4?
>
> Some of the ideas which have been tossed about include:
>
> 	* nanosecond timestamps, and support for time beyond the 2038

The 2nd one is probably more urgent than the first. I can see a general 
benefit from timestamp in ms, beyond that seems to be a specialty 
requirement best provided at the application level rather than the bits 
of a trillion inodes which need no such thing.

One argument against it is that with SMP with *almost* the same time in 
each CPU, cache everywhere in the i/o process, and various flavors of 
network filesystems, the atime/mtime become less and less useful for 
determining with great precision which file is most recently modified or 
accessed.

--
Bill Davidsen <davidsen@xxxxxxx>
  Obscure bug of 2004: BASH BUFFER OVERFLOW - if bash is being run by a
normal user and is setuid root, with the "vi" line edit mode selected,
and the character set is "big5," an off-by-one errors occurs during
wildcard (glob) expansion.

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