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Re: [dm-devel] Bcache upstreaming



On Thu, Jan 10, 2013 at 09:59:54AM -0800, Kent Overstreet wrote:
> On Wed, Jan 09, 2013 at 10:49:04AM -0500, Mike Snitzer wrote:
> > Hey Kent,
> > 
> > On Fri, Jan 4, 2013 at 6:50 PM, Kent Overstreet <koverstreet google com>wrote:
> > 
> > > I've (finally!) got a bcache branch hacked up that ought to be suitable
> > > to go upstream, possibly in staging initially.
> > >
> > > It's currently closer to the dev branch than the stable branch, plus
> > > some additional minor changes to make it all more self contained. The
> > > code has seen a decent amount of testing and I think it's in good shape,
> > > but I'd like it if it could see a bit more testing before I see about
> > > pushing it upstream.
> > >
> > > If anyone wants to try it out, checkout the bcache-for-staging branch.
> > > It's against Linux 3.7.
> > 
> > 
> > I pulled your 'bcache-for-staging' code into a 'dm-devel-cache-bcache'
> > branch on my github:
> > https://github.com/snitm/linux
> > 
> > Purpose is to have a single kernel to compare dm-cache and bcache.  My
> > branch is against 3.8-rc2.  While importing your code I needed the
> > following change to get bcache to compile:
> > https://github.com/snitm/linux/commit/400b1257e93975864fd6c4b827537a0234551253
> > 
> > It now builds without issue but I haven't tested the resulting bcache to
> > know if I broke the sysfs interface due to s/cache/bcache/ on some local
> > variables, I don't think I did but I'll defer to you.  (BTW those crafty
> > sysfs macros you have were pretty opaque; not really seeing what they buy
> > in the grand scheme.  And #include "sysfs.c" is different than any code
> > I've seen in the kernel).
> 
> Yeah, it was an ugly hack when I pulled the sysfs code out of super.c so
> I could avoid adding a bunch of non static symbols. But apparantly the
> various functions weren't even static in the first place, heh. I'll fix
> this the right way, thanks.

Want to try again with the latest bcache-for-upstream branch? I fixed
all that sysfs stuff, but I wasn't seeing the original build error so
I'd appreciate if you verify I did in fact fix that issue.


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