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SubjectRe: [PATCH v6 4/5] fs, xfs: introduce MAP_DIRECT for creating block-map-atomic file ranges
I still can't make any sense of this description.  What is an external
agent? Userspace obviously can't ever see a change in the extent
map, so it can't be meant.

It would help a lot if you could come up with a concrete user for this,
including example code.

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