lkml.org 
[lkml]   [2017]   [Apr]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/4] fs: fix data invalidation in the cleancache during direct IO
On Fri, 14 Apr 2017 17:07:50 +0300 Andrey Ryabinin <aryabinin@virtuozzo.com> wrote:

> Some direct write fs hooks call invalidate_inode_pages2[_range]()
> conditionally iff mapping->nrpages is not zero. If page cache is empty,
> buffered read following after direct IO write would get stale data from
> the cleancache.
>
> Also it doesn't feel right to check only for ->nrpages because
> invalidate_inode_pages2[_range] invalidates exceptional entries as well.
>
> Fix this by calling invalidate_inode_pages2[_range]() regardless of nrpages
> state.

I'm not understanding this. I can buy the argument about
nrexceptional, but why does cleancache require the
invalidate_inode_pages2_range) call even when ->nrpages is zero?

I *assume* it's because invalidate_inode_pages2_range() calls
cleancache_invalidate_inode(), yes? If so, can we please add this to
the changelog? If not then please explain further.



\
 
 \ /
  Last update: 2017-04-19 00:48    [W:0.425 / U:27.496 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site