netfs: Fix folio state after ENOMEM whilst under writeback iteration

Fix the state of the current folio when ENOMEM occurs during writeback
iteration.  The folio needs to be redirtied and unlocked before the
terminal writeback_iter() is invoked.

Fixes: 06fa229ceb36 ("netfs: Abstract out a rolling folio buffer implementation")
Link: https://sashiko.dev/#/patchset/20260619140646.2633762-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/20260625140640.3116900-15-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 (Amutable) <brauner@kernel.org>

diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index 3682896..f2761c9 100644 (file)
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -582,6 +582,10 @@ int netfs_writepages(struct address_space *mapping,
                }
 
                error = netfs_write_folio(wreq, wbc, folio);
+               if (error == -ENOMEM) {
+                       folio_redirty_for_writepage(wbc, folio);
+                       folio_unlock(folio);
+               }
        } while ((folio = writeback_iter(mapping, wbc, folio, &error)));
 
        netfs_end_issue_write(wreq);