On 4/16/2024 17:26, Darrick J. Wong wrote:
On Tue, Apr 16, 2024 at 11:24:27PM +0000, linux-xfs.ykg@xxxxxxxxxx wrote:
Greetings,
I was attempting to use mkfs.xfs on Linux Mint 21 (kernel 6.5.0, xfsprogs
5.13.0) and ran into an error trying to use realtime and reflink features on
the same filesystem. Is there anything I'm doing wrong, or is this
combination simply not supported on the same filesystem?
The exact command I ran was:
mkfs.xfs -N -r rtdev=/dev/sda1,extsize=1048576 -m reflink=1 /dev/sda2
Which returned with:
reflink not supported with realtime devices
Just to be clear - I didn't expect to be able to use reflinking on realtime
files (*), but I did expect to be able to have realtime files and reflinked
non-realtime files supported on the same filesystem. With my limited
knowledge of the inner workings of XFS, those two features _seem_ like they
could both work together as long as they are used on different inodes. Is
this not the case?
It's not supported, currently. Patches have been out for review since
2020 but have not moved forward due to prioritization and backlog issues.
Sorry about that. :(
https://lore.kernel.org/linux-xfs/160945477567.2833676.4112646582104319587.stgit@magnolia/
--D
Thanks,
Reed Wilson
(*) I noticed that there were recent commits for reflinking realtime files,
but that's not really what I was looking for
Thanks for the quick response. It's not really a big problem in my case; I can
work around it fairly easily. I mostly wanted to verify that it's not a supported
configuration since I couldn't find any documentation to that effect.
Thanks again!
Reed Wilson
