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block/rbd: workaround for ceph issue #53784
librbd had a bug until early 2022 that affected all versions of ceph that supported fast-diff. This bug results in reporting of incorrect offsets if the offset parameter to rbd_diff_iterate2 is not object aligned. This patch works around this bug for pre Quincy versions of librbd. Fixes: 0347a8f Cc: qemu-stable@nongnu.org Signed-off-by: Peter Lieven <pl@kamp.de> Message-Id: <20220113144426.4036493-3-pl@kamp.de> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Tested-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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