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由 John Snow 提交于
Accidentally, I removed a "feature" where empty drives had geometry values applied to them, which allows seek on empty drives to work "by accident," as QEMU actually tries to disallow that. Seeks on empty drives should work, though, but the easiest thing is to restore the misfeature where empty drives have non-zero geometries applied. Document the hack accordingly. [Maintainer edit] This fix corrects a regression introduced in d5d47efc, where pick_geometry was modified such that it would not operate on empty drives, and as a result if there is no diskette inserted, QEMU no longer populates it with geometry bounds. As a result, seek fails when QEMU denies to move the current track, but reports success anyway. This can confuse the guest, leading to kernel panics in the guest. Signed-off-by: NJohn Snow <jsnow@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Message-id: 1454106932-17236-1-git-send-email-jsnow@redhat.com
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