1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index e12cdc6d79ee..2d1ffe3cf1ee 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -299,6 +299,8 @@ static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
 extern void __lock_page(struct page *page);
 extern int __lock_page_killable(struct page *page);
 extern void __lock_page_nosync(struct page *page);
+extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
+                                unsigned int flags);
 extern void unlock_page(struct page *page);
 
 static inline void __set_page_locked(struct page *page)
@@ -351,6 +353,17 @@ static inline void lock_page_nosync(struct page *page)
 }
         
 /*
+ * lock_page_or_retry - Lock the page, unless this would block and the
+ * caller indicated that it can handle a retry.
+ */
+static inline int lock_page_or_retry(struct page *page, struct mm_struct *mm,
+                                     unsigned int flags)
+{
+        might_sleep();
+        return trylock_page(page) || __lock_page_or_retry(page, mm, flags);
+}
+
+/*
  * This is exported only for wait_on_page_locked/wait_on_page_writeback.
  * Never use this directly!
  */