lkml.org 
[lkml]   [2020]   [Jan]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 01/19] dax: remove block device dependencies
On Thu, Jan 09, 2020 at 12:03:01PM -0800, Dan Williams wrote:
> > So I'd find two options reasonably consistent:
> > 1) Keep status quo where partitions are created and support DAX.
> > 2) Stop partition creation altogether, if anyones wants to split pmem
> > device further, he can use dm-linear for that (i.e., kpartx).
> >
> > But I'm not sure if the ship hasn't already sailed for option 2) to be
> > feasible without angry users and Linus reverting the change.
>
> Christoph? I feel myself leaning more and more to the "keep pmem
> partitions" camp.
>
> I don't see "drop partition support" effort ending well given the long
> standing "ext4 fails to mount when dax is not available" precedent.

Do we have any evidence of existing setups with DAX and partitions?
Can we just throw in a patch to reject that case for now before actually
removing the code and see if anyone screams. And fix ext4 up while
we are at it.

> I think the next least bad option is to have a dax_get_by_host()
> variant that passes an offset and length pair rather than requiring a
> later bdev_dax_pgoff() to recall the offset. This also prevents
> needing to add another dax-device object representation.

IFF we have to keep partition support, yes. But keeping it just seems
like a really bad idea.

\
 
 \ /
  Last update: 2020-01-10 13:37    [W:0.182 / U:3.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site