6.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Howells <dhowells@xxxxxxxxxx>
[ Upstream commit 7dfc8f0c6144c290dbeb01835a67e81b34dda8cd ]
Fix netfs_release_folio() to say no (ie. return false) if the folio is
dirty (analogous with iomap's behaviour). Without this, it will say yes to
the release of a dirty page by split_huge_page_to_list_to_order(), which
will result in the loss of untruncated data in the folio.
Without this, the generic/075 and generic/112 xfstests (both fsx-based
tests) fail with minimum folio size patches applied[1].
Fixes: c1ec4d7c2e13 ("netfs: Provide invalidate_folio and release_folio calls")
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240815090849.972355-1-kernel@xxxxxxxxxxxxxxxx/ [1]
Link: https://lore.kernel.org/r/20240823200819.532106-4-dhowells@xxxxxxxxxx
cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
cc: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
cc: Jeff Layton <jlayton@xxxxxxxxxx>
cc: Marc Dionne <marc.dionne@xxxxxxxxxxxx>
cc: linux-afs@xxxxxxxxxxxxxxxxxxx
cc: netfs@xxxxxxxxxxxxxxx
cc: linux-mm@xxxxxxxxx
cc: linux-fsdevel@xxxxxxxxxxxxxxx
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/netfs/misc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/netfs/misc.c b/fs/netfs/misc.c
index 607a1972f4563..21acf4b092a46 100644
--- a/fs/netfs/misc.c
+++ b/fs/netfs/misc.c
@@ -161,6 +161,9 @@ bool netfs_release_folio(struct folio *folio, gfp_t gfp)
struct netfs_inode *ctx = netfs_inode(folio_inode(folio));
unsigned long long end;
+ if (folio_test_dirty(folio))
+ return false;
+
end = folio_pos(folio) + folio_size(folio);
if (end > ctx->zero_point)
ctx->zero_point = end;
--
2.43.0
