Messages in this thread | | | Date | Wed, 17 Jun 2015 09:50:33 -0700 | Subject | Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices | From | Dan Williams <> |
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On Wed, Jun 17, 2015 at 9:47 AM, Jeff Moyer <jmoyer@redhat.com> wrote: > Christoph Hellwig <hch@lst.de> writes: > >> On Wed, Jun 10, 2015 at 02:46:16PM -0400, Matthew Wilcox wrote: >>> Don't screw up rw_page. The point of rw_page is to read or write a page >>> cache page. It can sleep, and it indicates success by using the page >>> flags. Don't try and scqueeze rw_bytes into it. If you want rw_bytes >>> to be a queue operation, that's one thing, but don't mess with rw_page. >> >> Oh, I forgot about the page manipulating nature. Yes, we'll need a different >> operation in this case. > > I didn't see this addressed in the new patch set. I'm also concerned > about the layering, but I haven't put enough time into it to really make > a better suggestion. I really dislike the idea of yet another device > stacking model in the kernel and I'm worried the code will go in, and the > sysfs interface will end up as a "user abi" and we won't be able to > change it in the future. > > Dan, have you made any progress on this, or do you have plans to?
? in v6 ->rw_bytes() moved from libnvdimm local hackery to a top-level block device operation. Is that your concern or something else?
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