* [PATCH 6.12 0006/1376] netfs: Fix netfs_read_folio() to wait on writeback
[not found] <20260912065607.535295758@linuxfoundation.org>
@ 2026-09-12 6:40 ` Greg Kroah-Hartman
0 siblings, 0 replies; only message in thread
From: Greg Kroah-Hartman @ 2026-09-12 6:40 UTC (permalink / raw)
To: stable
Cc: Greg Kroah-Hartman, patches, David Howells, Paulo Alcantara,
Matthew Wilcox, netfs, linux-fsdevel, Christian Brauner,
Suraj Jitindar Singh, Sasha Levin
6.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Howells <dhowells@redhat.com>
commit ded0c6f1606061148c202825f7e53d711f9f84cf upstream.
Fix netfs_read_folio() to wait for an ongoing writeback to complete so that
it can trust the dirty flag and whatever is attached to folio->private
(folio->private may get cleaned up by the collector before it clears the
writeback flag).
Fixes: ee4cdf7ba857 ("netfs: Speed up buffered reading")
Closes: https://sashiko.dev/#/patchset/20260414082004.3756080-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/20260512123404.719402-23-dhowells@redhat.com
cc: Paulo Alcantara <pc@manguebit.org>
cc: Matthew Wilcox <willy@infradead.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Suraj Jitindar Singh <surajjs@amazon.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/netfs/buffered_read.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c
index d99284e35126c..fd41e38aedb75 100644
--- a/fs/netfs/buffered_read.c
+++ b/fs/netfs/buffered_read.c
@@ -565,6 +565,8 @@ int netfs_read_folio(struct file *file, struct folio *folio)
struct netfs_inode *ctx = netfs_inode(mapping->host);
int ret;
+ folio_wait_writeback(folio);
+
if (folio_test_dirty(folio)) {
trace_netfs_folio(folio, netfs_folio_trace_read_gaps);
return netfs_read_gaps(file, folio);
--
2.53.0
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