Re: Shrinking XFS - is that happening?

["Nirjhar Roy (IBM)" <nirjhar.roy.lists@gmail.com>]

On 8/11/25 20:55, Darrick J. Wong wrote:
> On Mon, Aug 11, 2025 at 03:48:18AM -0700, Christoph Hellwig wrote:
>> On Tue, Aug 05, 2025 at 10:20:15AM +0530, Nirjhar Roy (IBM) wrote:
>>> On Mon, 2025-08-04 at 17:13 +0200, Roy Sigurd Karlsbakk wrote:
>>>> Hi all!
>>>>
>>>> I beleive I heard something from someone some time back about work in progress on shrinking xfs filesystems. Is this something that's been worked with or have I been lied to or just had a nice dream?
>>>>
>>>> roy
>>> I have recently posted an RFC[1]. The work is based/inspired from an old RFC[2] by Gao and ideas
>>> given by Dave Chinner.
>> Like the previous attempts it doesn't seem to include an attempt to
>> address the elephant in the room:  moving inodes out of the to be
>> removed AGs or tail blocks of an AG.
> Anyone who wants to finish the evacuation part is welcome to pick this
> up:
> https://lore.kernel.org/linux-xfs/173568777852.2709794.6356870909327619205.stgit@frogsfrogsfrogs/

Hi Darrick,

I am working on the extending my online shrink fs work [1] to realtime 
fs shrink and as a part of that project, I am looking into the patchbomb 
above - specifically " [PATCHSET 3/5] xfsprogs: defragment free space". 
I have a high level questions before I delve deep into the patches above:

1. Can you please elaborate a bit on what do you mean by "finish the 
evacuation part"? I took a very high level look at the patch, and it 
seems it is already adding support to move data from one rtg/AG to another?

--NR

>
> --D

-- 
Nirjhar Roy
Linux Kernel Developer
IBM, Bangalore