df50cf195b
This is a fix for a regression introduced in r246293. vm_page_clear_dirty expects the range to have DEV_BSIZE aligned boundaries, otherwise it extends them. Thus it can happen that the whole page is marked clean while actually having some small dirty region(s). This commit makes the range properly aligned and ensures that only the clean data is marked as such. It would interesting to evaluate how much benefit clearing with DEV_BSIZE granularity produces. Perhaps instead we should clear the whole page when it is completely overwritten and don't bother clearing any bits if only a portion a page is written. Reviewed by: kib Approved by: re (gjb)
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