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** Changed in: linux (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/921096
Title:
HPA partition table check does not account for the possibility of a
filesystem spanning the entire disk
Status in linux package in Ubuntu:
Won't Fix
Bug description:
Eric Sandeen of Red Hat contacted me about a problem reported to the
XFS list on upgrade from Ubuntu 10.10 (or earlier) to 11.04 (or
later):
http://www.spinics.net/lists/xfs/msg09177.html
He found a similar problem reported against ext4:
http://www.linuxquestions.org/questions/linux-general-1/cannot-
mount-hard-disk-block-count-exceeds-size-of-device-bad-partition-
table-880149/
We've worked out that this is due to this change to host protected
area (HPA) handling in 11.04:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/380138
Now, reverting to the upstream default of honouring the HPA was
absolutely the right thing to do here. We thought we'd covered all
the likely upgrade failures by relying on Tejun Heo's upstream change,
which checks whether the partition table extends beyond the HPA and if
it does then it disables the HPA so you don't lose access to real
data. However, it looks like we overlooked the case where there's no
partition table, but instead there's a filesystem spanning the entire
disk: this is the case in both the reports linked to above.
In addition to the kernel check, the kernel should ideally check for
filesystems extending beyond the length that the block device would
become if its HPA were honoured, and in that case it should disable
the HPA.
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