[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20230626173521.459345-11-willy@infradead.org>
Date: Mon, 26 Jun 2023 18:35:19 +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 10/12] writeback: Add for_each_writeback_folio()
Wrap up the iterator with a nice bit of syntactic sugar. Now the
caller doesn't need to know about wbc->err and can just return error,
not knowing that the iterator took care of storing errors correctly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
include/linux/writeback.h | 14 +++++++++++---
mm/page-writeback.c | 11 ++++-------
2 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 7dd050b40e4b..84d5306ef045 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -369,14 +369,22 @@ int balance_dirty_pages_ratelimited_flags(struct address_space *mapping,
bool wb_over_bg_thresh(struct bdi_writeback *wb);
+struct folio *writeback_iter_init(struct address_space *mapping,
+ struct writeback_control *wbc);
+struct folio *writeback_iter_next(struct address_space *mapping,
+ struct writeback_control *wbc, struct folio *folio, int error);
+
+#define for_each_writeback_folio(mapping, wbc, folio, error) \
+ for (folio = writeback_iter_init(mapping, wbc); \
+ folio || ((error = wbc->err), false); \
+ folio = writeback_iter_next(mapping, wbc, folio, error))
+
typedef int (*writepage_t)(struct folio *folio, struct writeback_control *wbc,
void *data);
-
-void tag_pages_for_writeback(struct address_space *mapping,
- pgoff_t start, pgoff_t end);
int write_cache_pages(struct address_space *mapping,
struct writeback_control *wbc, writepage_t writepage,
void *data);
+
int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
void writeback_set_ratelimit(void);
void tag_pages_for_writeback(struct address_space *mapping,
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index ef61d7006c5e..245d6318dfb2 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2451,7 +2451,7 @@ static struct folio *writeback_get_folio(struct address_space *mapping,
return folio;
}
-static struct folio *writeback_iter_init(struct address_space *mapping,
+struct folio *writeback_iter_init(struct address_space *mapping,
struct writeback_control *wbc)
{
if (wbc->range_cyclic) {
@@ -2473,7 +2473,7 @@ static struct folio *writeback_iter_init(struct address_space *mapping,
return writeback_get_folio(mapping, wbc);
}
-static struct folio *writeback_iter_next(struct address_space *mapping,
+struct folio *writeback_iter_next(struct address_space *mapping,
struct writeback_control *wbc, struct folio *folio, int error)
{
if (unlikely(error)) {
@@ -2550,13 +2550,10 @@ int write_cache_pages(struct address_space *mapping,
struct folio *folio;
int error;
- for (folio = writeback_iter_init(mapping, wbc);
- folio;
- folio = writeback_iter_next(mapping, wbc, folio, error)) {
+ for_each_writeback_folio(mapping, wbc, folio, error)
error = writepage(folio, wbc, data);
- }
- return wbc->err;
+ return error;
}
EXPORT_SYMBOL(write_cache_pages);
--
2.39.2
Powered by blists - more mailing lists