linux-kernel - [PATCH 2/3] mm/writeback: Add wait_on_page_writeback

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Message-ID: <161650042701.2445805.12535282100365692426.stgit@warthog.procyon.org.uk>
Date:   Tue, 23 Mar 2021 11:53:47 +0000
From:   David Howells <dhowells@...hat.com>
To:     linux-cachefs@...hat.com, linux-afs@...ts.infradead.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Christoph Hellwig <hch@....de>, linux-mm@...ck.org,
        dhowells@...hat.com,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Christoph Hellwig <hch@....de>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] mm/writeback: Add wait_on_page_writeback_killable

From: Matthew Wilcox (Oracle) <willy@...radead.org>

This is the killable version of wait_on_page_writeback.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: linux-afs@...ts.infradead.org
cc: linux-mm@...ck.org
Link: https://lore.kernel.org/r/20210320054104.1300774-3-willy@infradead.org
---

 include/linux/pagemap.h |    1 +
 mm/page-writeback.c     |   16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 8f4daac6eb4b..8c9947fd62f3 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -682,6 +682,7 @@ static inline int wait_on_page_locked_killable(struct page *page)
 
 int put_and_wait_on_page_locked(struct page *page, int state);
 void wait_on_page_writeback(struct page *page);
+int wait_on_page_writeback_killable(struct page *page);
 extern void end_page_writeback(struct page *page);
 void wait_for_stable_page(struct page *page);
 
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index eb34d204d4ee..9e35b636a393 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2833,6 +2833,22 @@ void wait_on_page_writeback(struct page *page)
 }
 EXPORT_SYMBOL_GPL(wait_on_page_writeback);
 
+/*
+ * Wait for a page to complete writeback.  Returns -EINTR if we get a
+ * fatal signal while waiting.
+ */
+int wait_on_page_writeback_killable(struct page *page)
+{
+	while (PageWriteback(page)) {
+		trace_wait_on_page_writeback(page, page_mapping(page));
+		if (wait_on_page_bit_killable(page, PG_writeback))
+			return -EINTR;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(wait_on_page_writeback_killable);
+
 /**
  * wait_for_stable_page() - wait for writeback to finish, if necessary.
  * @page:	The page to wait on.