linux-kernel - Re: [PATCH 1/9] mm: Fix missing folio invalidation calls during truncation

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Message-ID: <ZsjtOVMD2dxRw68H@casper.infradead.org>
Date: Fri, 23 Aug 2024 21:12:41 +0100
From: Matthew Wilcox <willy@...radead.org>
To: David Howells <dhowells@...hat.com>
Cc: Christian Brauner <christian@...uner.io>,
	Steve French <sfrench@...ba.org>,
	Pankaj Raghav <p.raghav@...sung.com>,
	Paulo Alcantara <pc@...guebit.com>,
	Jeff Layton <jlayton@...nel.org>, netfs@...ts.linux.dev,
	linux-afs@...ts.infradead.org, linux-cifs@...r.kernel.org,
	linux-nfs@...r.kernel.org, ceph-devel@...r.kernel.org,
	v9fs@...ts.linux.dev, linux-erofs@...ts.ozlabs.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Marc Dionne <marc.dionne@...istor.com>
Subject: Re: [PATCH 1/9] mm: Fix missing folio invalidation calls during
 truncation

On Fri, Aug 23, 2024 at 09:08:09PM +0100, David Howells wrote:
> When AS_RELEASE_ALWAYS is set on a mapping, the ->release_folio() and
> ->invalidate_folio() calls should be invoked even if PG_private and
> PG_private_2 aren't set.  This is used by netfslib to keep track of the
> point above which reads can be skipped in favour of just zeroing pagecache
> locally.
> 
> There are a couple of places in truncation in which invalidation is only
> called when folio_has_private() is true.  Fix these to check
> folio_needs_release() instead.

Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>

I think we also want to change the folio_has_private() call in
mapping_evict_folio() to folio_test_private().  Same for the one
in migrate_vma_check_page().