On Fri, Apr 05, 2024 at 08:51:35AM +0200, Christoph Hellwig wrote: > On Thu, Apr 04, 2024 at 12:33:40PM +0300, Amir Goldstein wrote: > > I don't follow what you are saying. > > Which code is in non-starter violation? > > kernfs for calling lookup_bdev() with internal of->mutex held? > > That is a huge problem, and has been causing endless annoying lockdep > chains in the block layer for us. If we have some way to kill this > the whole block layer would benefit. Specifically of->mutex or having pathwalk done from some ->write_iter()? Incidentally, losetup happily accepts sysfs files as backing store. I don't think it adds problems we don't have otherwise, but IMO that's really bogus...
