I agree, their seems to be a bug in LVM.
I am running XFS Version 1.2pre3 based on the 2.4.19 kernel and I cannot extend a LV with XFS fs on top.
In particular this works:
>>>
xfs_freeze -f /data (I don't have the patch installed)
lvcreate --snapshot -L 100M --name data_snap /dev/VG/data
xfs_freeze -u /data (I don't have the patch installed)
mount -t xfs -o ro,nouuid /dev/VG/data_snap /data_snap
<<<
And this does not.
>>>
xfs_freeze -f /data (I don't have the patch installed)
lvcreate --snapshot -L 100M --name data_snap /dev/VG/data
xfs_freeze -u /data (I don't have the patch installed)
lvdisplay /dev/VG/data_snap (verified 0% used)
dd if=/dev/zero of=/data/dummy bs=1M count=75 (create a 75 Meg dummy file)
lvdisplay /dev/VG/data_snap (verified approx 75% used)
lvextend -L +100M /dev/VG/data_snap
lvdisplay /dev/VG/data_snap (verified approx 37% used)
# Everything looks fine, so I try to mount it
mount -t xfs -o ro,nouuid /dev/VG/data_snap /data_snap
mount: wrong fs type, bad option, bad superblock on /dev/TruStore-Data/data_snap,
or too many mounted file systems
<<<
Greg Freemyer
The Norcross Group
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