I can confirm this problem; I'm also not able to resize online a
reiserfs filesystem since i've upgraded to kernel 2.6 and lvm2.
resize_reiserfs says "run reiserfsck --check first" but reiserfsck
detects no problems. Offline resizing works without any complaints. Lvm
and reiserfs partitions were set up with linux 2.4 and lvm1 and back
then online resizing was no big deal, but then I migrated to 2.6 and
lvm2 and now I have always to unmount the partition first before
resizing the filesystem wich is really annoying. lvmextend itself seems
to do its job well, but then again only kernel and lvm have changed
before the trouble has started. I didn't find any hints on the web
about this issue but this thread on linux-lvm.
Piotr Kaczuba
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