linux-kernel - [PATCH 11/12] iomap: Convert iomap_writepages() to use for_each_writeback

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Date:   Mon, 26 Jun 2023 18:35:20 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jan Kara <jack@...e.com>, David Howells <dhowells@...hat.com>
Subject: [PATCH 11/12] iomap: Convert iomap_writepages() to use for_each_writeback_folio()

This removes one indirect function call per folio, and adds typesafety
by not casting through a void pointer.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 fs/iomap/buffered-io.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index a4fa81af60d9..a4dd17abe244 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1711,9 +1711,8 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
  * regular allocated space.
  */
 static int iomap_do_writepage(struct folio *folio,
-		struct writeback_control *wbc, void *data)
+		struct writeback_control *wbc, struct iomap_writepage_ctx *wpc)
 {
-	struct iomap_writepage_ctx *wpc = data;
 	struct inode *inode = folio->mapping->host;
 	u64 end_pos, isize;
 
@@ -1810,13 +1809,16 @@ iomap_writepages(struct address_space *mapping, struct writeback_control *wbc,
 		struct iomap_writepage_ctx *wpc,
 		const struct iomap_writeback_ops *ops)
 {
-	int			ret;
+	struct folio *folio;
+	int err;
 
 	wpc->ops = ops;
-	ret = write_cache_pages(mapping, wbc, iomap_do_writepage, wpc);
+	for_each_writeback_folio(mapping, wbc, folio, err)
+		err = iomap_do_writepage(folio, wbc, wpc);
+
 	if (!wpc->ioend)
-		return ret;
-	return iomap_submit_ioend(wpc, wpc->ioend, ret);
+		return err;
+	return iomap_submit_ioend(wpc, wpc->ioend, err);
 }
 EXPORT_SYMBOL_GPL(iomap_writepages);
 
-- 
2.39.2