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SubjectRe: [GIT PULL] overlayfs update for 4.18
On Tue, May 29, 2018 at 4:12 PM, Miklos Szeredi <> wrote:
> On Tue, May 29, 2018 at 3:59 PM, Christoph Hellwig <> wrote:

>>> vfs: export vfs_dedupe_file_range_one() to modules
>> Please use EXPORT_SYMBOL_GPL for all these crazy low-level exports.

I'd argue with the "crazy" part. This should have been the primary
interface from the start. The batched dedupe interface is the crazy

- deduping is page size granularity at worst; performance would not
be horrible even if we had to do one syscall per page
- vast majority of the time it will be file size granularity

Why was that batching invented in the first place?


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