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Message-Id: <20210320054104.1300774-24-willy@infradead.org>
Date: Sat, 20 Mar 2021 05:41:00 +0000
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: linux-mm@...ck.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-cachefs@...hat.com, linux-afs@...ts.infradead.org
Subject: [PATCH v5 23/27] mm/writeback: Add wait_for_stable_folio
Move wait_for_stable_page() into the folio compatibility file.
wait_for_stable_folio() avoids a call to compound_head() and is 14 bytes
smaller than wait_for_stable_page() was. The net text size grows by 24
bytes as a result of this patch.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
include/linux/pagemap.h | 1 +
mm/folio-compat.c | 6 ++++++
mm/page-writeback.c | 17 ++++++++---------
3 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index a6adf69ea5c5..c92782b77d98 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -813,6 +813,7 @@ int wait_on_folio_writeback_killable(struct folio *folio);
void end_page_writeback(struct page *page);
void end_folio_writeback(struct folio *folio);
void wait_for_stable_page(struct page *page);
+void wait_for_stable_folio(struct folio *folio);
void page_endio(struct page *page, bool is_write, int err);
diff --git a/mm/folio-compat.c b/mm/folio-compat.c
index 6aadecc39fba..335594fe414e 100644
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -29,3 +29,9 @@ void wait_on_page_writeback(struct page *page)
return wait_on_folio_writeback(page_folio(page));
}
EXPORT_SYMBOL_GPL(wait_on_page_writeback);
+
+void wait_for_stable_page(struct page *page)
+{
+ return wait_for_stable_folio(page_folio(page));
+}
+EXPORT_SYMBOL_GPL(wait_for_stable_page);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index a08e77abcf12..c222f88cf06b 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2862,17 +2862,16 @@ int wait_on_folio_writeback_killable(struct folio *folio)
EXPORT_SYMBOL_GPL(wait_on_folio_writeback_killable);
/**
- * wait_for_stable_page() - wait for writeback to finish, if necessary.
- * @page: The page to wait on.
+ * wait_for_stable_folio() - wait for writeback to finish, if necessary.
+ * @folio: The folio to wait on.
*
- * This function determines if the given page is related to a backing device
- * that requires page contents to be held stable during writeback. If so, then
+ * This function determines if the given folio is related to a backing device
+ * that requires folio contents to be held stable during writeback. If so, then
* it will wait for any pending writeback to complete.
*/
-void wait_for_stable_page(struct page *page)
+void wait_for_stable_folio(struct folio *folio)
{
- page = thp_head(page);
- if (page->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES)
- wait_on_page_writeback(page);
+ if (folio->page.mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES)
+ wait_on_folio_writeback(folio);
}
-EXPORT_SYMBOL_GPL(wait_for_stable_page);
+EXPORT_SYMBOL_GPL(wait_for_stable_folio);
--
2.30.2
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