linux-kernel - [PATCH 02/17] writeback: also update wbc->nr_to

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Message-Id: <20231222150827.1329938-3-hch@lst.de>
Date: Fri, 22 Dec 2023 16:08:12 +0100
From: Christoph Hellwig <hch@....de>
To: linux-mm@...ck.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Jan Kara <jack@...e.com>,
	David Howells <dhowells@...hat.com>,
	Brian Foster <bfoster@...hat.com>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jan Kara <jack@...e.cz>,
	Dave Chinner <dchinner@...hat.com>
Subject: [PATCH 02/17] writeback: also update wbc->nr_to_write on writeback failure

When exiting write_cache_pages early due to a non-integrity write
failure, wbc->nr_to_write currently doesn't account for the folio
we just failed to write.  This doesn't matter because the callers
always ingore the value on a failure, but moving the update to
common code will allow to simplify the code, so do it.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Jan Kara <jack@...e.cz>
Acked-by: Dave Chinner <dchinner@...hat.com>
---
 mm/page-writeback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index b13ea243edb6b2..8e312d73475646 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2473,6 +2473,7 @@ int write_cache_pages(struct address_space *mapping,
 			trace_wbc_writepage(wbc, inode_to_bdi(mapping->host));
 			error = writepage(folio, wbc, data);
 			nr = folio_nr_pages(folio);
+			wbc->nr_to_write -= nr;
 			if (unlikely(error)) {
 				/*
 				 * Handle errors according to the type of
@@ -2506,7 +2507,6 @@ int write_cache_pages(struct address_space *mapping,
 			 * 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) {
 				done = 1;
-- 
2.39.2