Re: [PATCH 2/2] xfs: fix stale data exposure problem when punch hole, collapse range or zero range across a delalloc extent

[yukuai (C)]

On 2020/1/7 5:57, Darrick J. Wong wrote:
> So your solution is to split the delalloc reservation to constrain the
> allocation to the range that's being operated on?
Yes, I'm trying to split delalloc reservation.
> If so, I think a better solution (at least from the perspective of
> reducing fragmentation) would be to map the extent unwritten and force a
> post-writeback conversion[1] but I got shot down for performance reasons
> the last time I suggested that.
I'm wondering if spliting delalloc reservation have the same performance 
issue.

Thanks!
Yu Kuai