On Fri, Jun 23, 2017 at 09:48:21AM -0700, Chris Mason wrote:
> Dave Jones hit a WARN_ON(nr < 0) in btrfs_wait_ordered_roots() with
> v4.12-rc6. This was because commit 70e7af244 made it possible for
> calc_reclaim_items_nr() to return a negative number. It's not really a
> bug in that commit, it just didn't go far enough down the stack to find
> all the possible 64->32 bit overflows.
>
> This switches calc_reclaim_items_nr() to return a u64 and changes everyone
> that uses the results of that math to u64 as well.
>
> Reported-by: Dave Jones <davej@xxxxxxxxxxxxxxxxx>
> Fixes: 70e7af2 ("Btrfs: fix delalloc accounting leak caused by u32 overflow")
> Signed-off-by: Chris Mason <clm@xxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
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