On Fri, 14 Apr 2017 17:07:50 +0300 Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> 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.
