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63148d426e
When move blocks is staging it requires an overlapping offline extent to cover the entire region to move. It performs the stage by modifying extents at a time. If there are fragmented source extents it will modify each of them at a time in the region. When looking for the extent to match the source extent it looked from the iblock of the start of the whole operation, not the start of the source extent it's matching. This meant that it would find a the first previous online extent it just modified, which wouldn't be online, and would return -EINVAL. The fix is to have it search from the logical start of the extent it's trying to match, not the start of the region. Signed-off-by: Zach Brown <zab@versity.com>