mm/writeback: Add wait_on_page_writeback_killable

This is the killable version of wait_on_page_writeback. Signed-off-by: Matthew Wilcox (Oracle) <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: David Howells <[email protected]> Tested-by: [email protected] cc: [email protected] cc: [email protected] Link: https://lore.kernel.org/r/[email protected]
tadfisher · Mar 23, 2021 · e5dbd33 · e5dbd33
1 parent 39f985c
commit e5dbd33
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diff --git 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
@@ -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.