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Data preallocation attempts to allocate large aligned regions of extents. It tried to fill the hole around a write offset that didn't contain an extent. It missed the case where there can be multiple extents between the start of the region and the hole. It could try to overwrite these additional existing extents and writes could return EINVAL. We fix this by trimming the preallocation to start at the write offset if there are any extents in the region before the write offset. The data preallocation test output has to be updated now that allocation extents won't grow towards the start of the region when there are existing extents. Signed-off-by: Zach Brown <zab@versity.com>