What happened to e4defrag relevant file and free space defrag?

What happened to e4defrag relevant file and free space defrag?

[Joakim Ziegler]

I'm using ext4 on quite large filesystems, for large image sequences. Some times 
these file systems fill up, and things get fragmented and a lot slower.

When reading this presentation from Linuxcon Japan 2010:

https://events.linuxfoundation.org/slides/2010/linuxcon_japan/linuxcon_jp2010_fujita.pdf

I see references to "relevant file defrag", which would be useable for me to 
defrag image sequences to get them in sequence, specifically:

"Patches related to relevant file defrag (e4defrag -r) are under review."

Also, about free space defrag, it says:

"Implement free space defragmentation (e4defrag -f). We might implement this 
feature when the relevant defrag development is completed."

Both of these, but especially relevant file defrag, would be very useful to 
solve the problems I'm facing. What happened to the patches that were under 
review? Was anything done? Was development of these features abandoned? Is there 
any chance of any of them being implemented in the relatively near future?

-- 
Joakim Ziegler  -  Supervisor de postproducción  -  Terminal
joakim@terminalmx.com   -   044 55 2971 8514   -   5264 0864
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Re: What happened to e4defrag relevant file and free space defrag?

[Joakim Ziegler]

On 23/08/14, 6:04, Joakim Ziegler wrote:
> I'm using ext4 on quite large filesystems, for large image sequences. Some times
> these file systems fill up, and things get fragmented and a lot slower.
>
> When reading this presentation from Linuxcon Japan 2010:
>
> https://events.linuxfoundation.org/slides/2010/linuxcon_japan/linuxcon_jp2010_fujita.pdf
>
>
> I see references to "relevant file defrag", which would be useable for me to
> defrag image sequences to get them in sequence, specifically:
>
> "Patches related to relevant file defrag (e4defrag -r) are under review."
>
> Also, about free space defrag, it says:
>
> "Implement free space defragmentation (e4defrag -f). We might implement this
> feature when the relevant defrag development is completed."
>
> Both of these, but especially relevant file defrag, would be very useful to
> solve the problems I'm facing. What happened to the patches that were under
> review? Was anything done? Was development of these features abandoned? Is there
> any chance of any of them being implemented in the relatively near future?

Bumping this, does anyone have any idea? Also copying Akira Fujita.

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Joakim Ziegler  -  Supervisor de postproducción  -  Terminal
joakim@terminalmx.com   -   044 55 2971 8514   -   5264 0864
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Re: What happened to e4defrag relevant file and free space defrag?

[Theodore Ts'o]

On Wed, Sep 03, 2014 at 01:40:42PM -0500, Joakim Ziegler wrote:
> On 23/08/14, 6:04, Joakim Ziegler wrote:
> >
> >Also, about free space defrag, it says:
> >
> >"Implement free space defragmentation (e4defrag -f). We might implement this
> >feature when the relevant defrag development is completed."

The e4defrag is in e2fsprogs, and the code is still getting maintained
and improved.  Dmitry Monakhov has in particular added a lot of
"torture tests", and found a number of race conditions in the
underlying kernel code.  He recently also sent a code refactor of the
kernel code which significantly improved it and (shrank the size of
ext4 by 550 lines of code).

That being said, there hasn't been any real feature development for
e4defrag in quite some time.  There has been some discussion about
what the kernel API's might be to support this feature, but there has
never been a finalized API proposal, let alone an implementation.

Cheers,

						- Ted

Re: What happened to e4defrag relevant file and free space defrag?

[Joakim Ziegler]

On 03/09/14, 14:02, Theodore Ts'o wrote:
> On Wed, Sep 03, 2014 at 01:40:42PM -0500, Joakim Ziegler wrote:
>> On 23/08/14, 6:04, Joakim Ziegler wrote:
>>>
>>> Also, about free space defrag, it says:
>>>
>>> "Implement free space defragmentation (e4defrag -f). We might implement this
>>> feature when the relevant defrag development is completed."
>
> The e4defrag is in e2fsprogs, and the code is still getting maintained
> and improved.  Dmitry Monakhov has in particular added a lot of
> "torture tests", and found a number of race conditions in the
> underlying kernel code.  He recently also sent a code refactor of the
> kernel code which significantly improved it and (shrank the size of
> ext4 by 550 lines of code).
>
> That being said, there hasn't been any real feature development for
> e4defrag in quite some time.  There has been some discussion about
> what the kernel API's might be to support this feature, but there has
> never been a finalized API proposal, let alone an implementation.

Yeah, I was mostly curious about the relevant file defrag, since Akira's 
presentation from a few years back said that there were patches in review, and 
it would, I think, largely solve my problem.

-- 
Joakim Ziegler  -  Supervisor de postproducción  -  Terminal
joakim@terminalmx.com   -   044 55 2971 8514   -   5264 0864
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