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Message-ID: <20240823200819.532106-2-dhowells@redhat.com>
Date: Fri, 23 Aug 2024 21:08:09 +0100
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <christian@...uner.io>,
Steve French <sfrench@...ba.org>
Cc: David Howells <dhowells@...hat.com>,
Pankaj Raghav <p.raghav@...sung.com>,
Paulo Alcantara <pc@...guebit.com>,
Jeff Layton <jlayton@...nel.org>,
Matthew Wilcox <willy@...radead.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: [PATCH 1/9] mm: Fix missing folio invalidation calls during truncation
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.
Without this, the generic/075 and generic/112 xfstests (both fsx-based
tests) fail with minimum folio size patches applied[1].
Fixes: b4fa966f03b7 ("mm, netfs, fscache: stop read optimisation when folio removed from pagecache")
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Matthew Wilcox (Oracle) <willy@...radead.org>
cc: Pankaj Raghav <p.raghav@...sung.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
cc: netfs@...ts.linux.dev
cc: linux-mm@...ck.org
cc: linux-fsdevel@...r.kernel.org
Link: https://lore.kernel.org/r/20240815090849.972355-1-kernel@pankajraghav.com/ [1]
---
mm/truncate.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/truncate.c b/mm/truncate.c
index 4d61fbdd4b2f..0668cd340a46 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -157,7 +157,7 @@ static void truncate_cleanup_folio(struct folio *folio)
if (folio_mapped(folio))
unmap_mapping_folio(folio);
- if (folio_has_private(folio))
+ if (folio_needs_release(folio))
folio_invalidate(folio, 0, folio_size(folio));
/*
@@ -219,7 +219,7 @@ bool truncate_inode_partial_folio(struct folio *folio, loff_t start, loff_t end)
if (!mapping_inaccessible(folio->mapping))
folio_zero_range(folio, offset, length);
- if (folio_has_private(folio))
+ if (folio_needs_release(folio))
folio_invalidate(folio, offset, length);
if (!folio_test_large(folio))
return true;
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