Hi all,
as you know kernel prior to 3.16 won't support properly v5 superblocks.
xfsprogs v 3.2.4 and higher defaults to v5 superblocks. This bit quite
a lot of people a year ago or so, when some distributions shipped 3.2.4
xfsprogs with older kernels.
Anyway, I was surprised to find no easy way to find out the superblock
version of an xfs FS. The best I've come across is
xfs_db /dev/this
sb
p
<snip>
versionnum = 0xb4a5
</snip>
So I suppose that the 5 in the end means that the superblock is v5? Can
anyone confirm please? The man page still pretends that the last number
should be 1 to 4, which is confusing.
Oh by the way I think the trick to create a v4 filesystem with mkfs.xfs
higher than 3.2.4 ( mkfs.xfs -m crc=0,finobt=0 /dev/this ) should be in
the FAQ, with a line like this:
Mounting the filesystem fails, and output from dmesg says "Version 5
superblock detected." What should I do?
v5 superblocks require a kernel v3.16 of higher. If you need your
xfs filesystem to be usable with older kernel, use the following
options to mkfs.xfs :
mkfs.xfs -m crc=0,finobt=0 /dev/this
--
------------------------------------------------------------------------
Emmanuel Florac | Direction technique
| Intellique
| <eflorac@xxxxxxxxxxxxxx>
| +33 1 78 94 84 02
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