On Tue, Oct 08, 2019 at 11:31:44PM -0700, Christoph Hellwig wrote: > Btw, I just had a chat with Dan last week on this. And he pointed out > that while this series deals with the read/write path issues of > reflink on DAX it doesn't deal with the mmap side issue that > page->mapping and page->index can point back to exactly one file. > > I think we want a few xfstests that reflink a file and then use the > different links using mmap, as that should blow up pretty reliably. Hmm, you're right, we don't actually have a test that checks the behavior of mwriting all copies of a shared block. Ok, I'll go write one. --D
