linux-kernel - [PATCH 03/14] writeback: fix done_index when hitting the wbc->nr_to

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Date: Thu, 15 Feb 2024 07:36:38 +0100
From: Christoph Hellwig <hch@....de>
To: linux-mm@...ck.org
Cc: Matthew Wilcox <willy@...radead.org>,
	Jan Kara <jack@...e.com>,
	David Howells <dhowells@...hat.com>,
	Brian Foster <bfoster@...hat.com>,
	Christian Brauner <brauner@...nel.org>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jan Kara <jack@...e.cz>,
	Dave Chinner <dchinner@...hat.com>
Subject: [PATCH 03/14] writeback: fix done_index when hitting the wbc->nr_to_write

When write_cache_pages finishes writing out a folio, it fails to update
done_index to account for the number of pages in the folio just written.
That means when range_cyclic writeback is restarted, it will be
restarted at this folio instead of after it as it should.  Fix that
by updating done_index before breaking out of the loop.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Brian Foster <bfoster@...hat.com>
Reviewed-by: Jan Kara <jack@...e.cz>
Acked-by: Dave Chinner <dchinner@...hat.com>
---
 mm/page-writeback.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 703e83c69ffe08..2679176da316b3 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2505,6 +2505,7 @@ int write_cache_pages(struct address_space *mapping,
 			 * keep going until we have written all the pages
 			 * we tagged for writeback prior to entering this loop.
 			 */
+			done_index = folio->index + nr;
 			wbc->nr_to_write -= nr;
 			if (wbc->nr_to_write <= 0 &&
 			    wbc->sync_mode == WB_SYNC_NONE) {
-- 
2.39.2