lkml.org 
[lkml]   [2020]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 06/14] block: lift setting the readahead size into the block layer
On Thu, Sep 10, 2020 at 01:15:41PM -0400, Mike Snitzer wrote:
> > I'll move it to blk_register_queue, which should work just fine.
>
> That'll work for initial DM table load as part of DM device creation
> (dm_setup_md_queue). But it won't account for DM table reloads that
> might change underlying devices on a live DM device (done using
> __bind).
>
> Both dm_setup_md_queue() and __bind() call dm_table_set_restrictions()
> to set/update queue_limits. It feels like __bind() will need to call a
> new block helper to set/update parts of queue_limits (e.g. ra_pages and
> io_pages).
>
> Any chance you're open to factoring out that block function as an
> exported symbol for use by blk_register_queue() and code like DM's
> __bind()?

I agree with the problem statement. OTOH adding an exported helper
for two trivial assignments seems a little silly..

For now I'll just keep the open coded ->io_pages assignment in
dm. Note that dm doesn't currently update the ->ra_pages value
based on the underlying devices, so an incremental patch to do that
might be useful as well.

\
 
 \ /
  Last update: 2020-09-15 09:09    [W:0.059 / U:0.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site