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> > This is problematic because get_unlocked_entry() will get the next > present entry in the range, and the next entry may not be > locked. Therefore any processing of the original locked entry will be > skipped. This can cause dax_layout_busy_page_range() to miss DMA-busy > pages in the range, leading file systems to free blocks whilst DMA > operations are ongoing which can lead to file system corruption. > > Instead callers from within a xas_for_each() loop should be waiting > for the current entry to be unlocked without advancing the XArray > state so a new function is introduced to wait. Oh wow, good eye! Did this trip up an xfstest, or did you see this purely by inspection? > Also while we are here rename get_unlocked_entry() to > get_next_unlocked_entry() to make it clear that it may advance the > iterator state. Outside of the above clarification of how found / end user effect you can add: Reviewed-by: Dan Williams