[PATCH v2 13/14] 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 <[email protected]>
cc: Paulo Alcantara <[email protected]>
cc: Matthew Wilcox <[email protected]>
cc: [email protected]
cc: [email protected]
---
 fs/netfs/write_issue.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index d1f98cca5d0f..6eb6cff12c17 100644
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -334,8 +334,11 @@ static int netfs_write_folio(struct netfs_io_request *wreq,
 
 	_enter("");
 
-	if (rolling_buffer_make_space(&wreq->buffer) < 0)
+	if (rolling_buffer_make_space(&wreq->buffer) < 0) {
+		folio_redirty_for_writepage(wbc, folio);
+		folio_unlock(folio);
 		return -ENOMEM;
+	}
 
 	/* netfs_perform_write() may shift i_size around the page or from out
 	 * of the page to beyond it, but cannot move i_size into or through the