Red Hat Bugzilla – Bug 442937
libblkid sees lvm2pv as swap
Last modified: 2008-04-18 15:21:58 EDT
libblkid ends up seeing an lvm2pv as a swap partition instead because swap is
earlier in the table. lvm2pv should probably be the first thing probed instead
of the last as it's a container. See attached patch
Created attachment 302779 [details]
Bleah, what a mess.
Neither mkswap nor pvcreate does a great job of zeroing other signatures around
the new signature. For some incantations, pvcreate-then-mkswap has an initial
4k on the disk which is *identical* to mkswap-then-pvcreate. :(
Sent a patch upstream (and to Jeremy) to check that the swap v1 header has a
valid version and page count... "pvcreate" by itself will zero those. (pvcreate
-u <blah> will not, unfortunately, so there's still a small hole).
But, it fixes Jeremy's case:
# blkid -c /dev/null /root/md0-for-esandeen
/root/md0-for-esandeen: UUID="kyOPnO-Biwa-PssU-PsXx-kJDW-36Ry-iZvqk5" TYPE="lvm2pv"
Patch committed and built and I tested it with my reproducer, so going to close