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Message-Id: <20230626173521.459345-10-willy@infradead.org>
Date: Mon, 26 Jun 2023 18:35:18 +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 09/12] writeback: Factor writeback_iter_next() out of write_cache_pages()
Pull the post-processing of the writepage_t callback into a
separate function. That means changing writeback_finish() to
return NULL, and writeback_get_next() to call writeback_finish()
when we naturally run out of folios.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
mm/page-writeback.c | 84 ++++++++++++++++++++++++---------------------
1 file changed, 44 insertions(+), 40 deletions(-)
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 659df2b5c7c0..ef61d7006c5e 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2360,7 +2360,7 @@ void tag_pages_for_writeback(struct address_space *mapping,
}
EXPORT_SYMBOL(tag_pages_for_writeback);
-static int writeback_finish(struct address_space *mapping,
+static struct folio *writeback_finish(struct address_space *mapping,
struct writeback_control *wbc, bool done)
{
folio_batch_release(&wbc->fbatch);
@@ -2375,7 +2375,7 @@ static int writeback_finish(struct address_space *mapping,
if (wbc->range_cyclic || (wbc->range_whole && wbc->nr_to_write > 0))
mapping->writeback_index = wbc->done_index;
- return wbc->err;
+ return NULL;
}
static struct folio *writeback_get_next(struct address_space *mapping,
@@ -2438,7 +2438,7 @@ static struct folio *writeback_get_folio(struct address_space *mapping,
for (;;) {
folio = writeback_get_next(mapping, wbc);
if (!folio)
- return NULL;
+ return writeback_finish(mapping, wbc, false);
wbc->done_index = folio->index;
folio_lock(folio);
@@ -2473,6 +2473,45 @@ 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 writeback_control *wbc, struct folio *folio, int error)
+{
+ if (unlikely(error)) {
+ /*
+ * Handle errors according to the type of writeback.
+ * There's no need to continue for background writeback.
+ * Just push done_index past this folio so media
+ * errors won't choke writeout for the entire file.
+ * For integrity writeback, we must process the entire
+ * dirty set regardless of errors because the fs may
+ * still have state to clear for each folio. In that
+ * case we continue processing and return the first error.
+ */
+ if (error == AOP_WRITEPAGE_ACTIVATE) {
+ folio_unlock(folio);
+ error = 0;
+ } else if (wbc->sync_mode != WB_SYNC_ALL) {
+ wbc->err = error;
+ wbc->done_index = folio->index +
+ folio_nr_pages(folio);
+ return writeback_finish(mapping, wbc, true);
+ }
+ if (!wbc->err)
+ wbc->err = error;
+ }
+
+ /*
+ * We stop writing back only if we are not doing integrity
+ * sync. In case of integrity sync we have to keep going until
+ * we have written all the folios we tagged for writeback prior
+ * to entering this loop.
+ */
+ if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
+ return writeback_finish(mapping, wbc, true);
+
+ return writeback_get_folio(mapping, wbc);
+}
+
/**
* write_cache_pages - walk the list of dirty pages of the given address space and write all of them.
* @mapping: address space structure to write
@@ -2513,46 +2552,11 @@ int write_cache_pages(struct address_space *mapping,
for (folio = writeback_iter_init(mapping, wbc);
folio;
- folio = writeback_get_folio(mapping, wbc)) {
+ folio = writeback_iter_next(mapping, wbc, folio, error)) {
error = writepage(folio, wbc, data);
- if (unlikely(error)) {
- /*
- * Handle errors according to the type of
- * writeback. There's no need to continue for
- * background writeback. Just push done_index
- * past this page so media errors won't choke
- * writeout for the entire file. For integrity
- * writeback, we must process the entire dirty
- * set regardless of errors because the fs may
- * still have state to clear for each page. In
- * that case we continue processing and return
- * the first error.
- */
- if (error == AOP_WRITEPAGE_ACTIVATE) {
- folio_unlock(folio);
- error = 0;
- } else if (wbc->sync_mode != WB_SYNC_ALL) {
- wbc->err = error;
- wbc->done_index = folio->index +
- folio_nr_pages(folio);
- return writeback_finish(mapping, wbc, true);
- }
- if (!wbc->err)
- wbc->err = error;
- }
-
- /*
- * We stop writing back only if we are not doing
- * integrity sync. In case of integrity sync we have to
- * keep going until we have written all the pages
- * we tagged for writeback prior to entering this loop.
- */
- if (--wbc->nr_to_write <= 0 &&
- wbc->sync_mode == WB_SYNC_NONE)
- return writeback_finish(mapping, wbc, true);
}
- return writeback_finish(mapping, wbc, false);
+ return wbc->err;
}
EXPORT_SYMBOL(write_cache_pages);
--
2.39.2
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