XFS setting custom extent size: real-time section only?

[Heilige Gheist <hgheist@xxxxxxxxx>]

I'm trying to get custom extent size per file working, but
XFS_IOC_FSSETXATTR ioctl returns with EINVAL,
both from my code or from xfs_io.
The environment is SLES9 SP2, 2.6.5-7.252 kernel, xfsprogs-2.6.25-0.6
After examining the kernel code in xfs_vnodeops.c we found out that
custom extent size is supported on files in real-time section only.
This is not mentioned anywhere else in the documentation, so I'm
wondering whether this limitation is removed in further kernel
versions.
I've downloaded the recent xfsprogs-2.8.4, it uses a new flag
XFS_XFLAG_EXTSIZE when setting the custom extent size.
I'm not sure what kernel version do I need to work with 2.8.4, but it's
certainly a sign that kernel support has changed.
Can anyone shed a light on this?

Thanks,
Alan


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