[PATCH v2 12/14] netfs: Fix writeback error handling

[David Howells <dhowells@redhat.com>]

Fix the error handling in writeback_iter() loop.  If an error occurs,
writeback_iter() needs to be called again with *error set to the error so
that it can clean up iteration state.  Further, the current folio needs
unlocking and redirtying.

Fixes: 288ace2f57c9 ("netfs: New writeback implementation")
Link: https://sashiko.dev/#/patchset/20260619140646.2633762-1-dhowells%40redhat.com
Signed-off-by: David Howells <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
---
 fs/netfs/write_issue.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index e5d4f9ba3d6b..d1f98cca5d0f 100644
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -582,8 +582,6 @@ int netfs_writepages(struct address_space *mapping,
 		}
 
 		error = netfs_write_folio(wreq, wbc, folio);
-		if (error < 0)
-			break;
 	} while ((folio = writeback_iter(mapping, wbc, folio, &error)));
 
 	netfs_end_issue_write(wreq);
@@ -594,6 +592,9 @@ int netfs_writepages(struct address_space *mapping,
 	return error;
 
 couldnt_start:
+	folio_redirty_for_writepage(wbc, folio);
+	folio_unlock(folio);
+	writeback_iter(mapping, wbc, folio, &error);
 	netfs_kill_dirty_pages(mapping, wbc, folio);
 out:
 	netfs_wb_end(ictx);