1 files changed, 27 insertions, 10 deletions

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index e12cdc6d79ee..716875e53520 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -48,7 +48,7 @@ static inline void mapping_clear_unevictable(struct address_space *mapping)
 
 static inline int mapping_unevictable(struct address_space *mapping)
 {
-        if (likely(mapping))
+        if (mapping)
                 return test_bit(AS_UNEVICTABLE, &mapping->flags);
         return !!mapping;
 }
@@ -219,6 +219,12 @@ static inline struct page *page_cache_alloc_cold(struct address_space *x)
         return __page_cache_alloc(mapping_gfp_mask(x)|__GFP_COLD);
 }
 
+static inline struct page *page_cache_alloc_readahead(struct address_space *x)
+{
+        return __page_cache_alloc(mapping_gfp_mask(x) |
+                                  __GFP_COLD | __GFP_NORETRY | __GFP_NOWARN);
+}
+
 typedef int filler_t(void *, struct page *);
 
 extern struct page * find_get_page(struct address_space *mapping,
@@ -298,7 +304,8 @@ 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)
@@ -340,22 +347,31 @@ static inline int lock_page_killable(struct page *page)
 }
 
 /*
- * lock_page_nosync should only be used if we can't pin the page's inode.
- * Doesn't play quite so well with block device plugging.
+ * lock_page_or_retry - Lock the page, unless this would block and the
+ * caller indicated that it can handle a retry.
  */
-static inline void lock_page_nosync(struct page *page)
+static inline int lock_page_or_retry(struct page *page, struct mm_struct *mm,
+                                     unsigned int flags)
 {
         might_sleep();
-        if (!trylock_page(page))
-                __lock_page_nosync(page);
+        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!
  */
 extern void wait_on_page_bit(struct page *page, int bit_nr);
 
+extern int wait_on_page_bit_killable(struct page *page, int bit_nr);
+
+static inline int wait_on_page_locked_killable(struct page *page)
+{
+        if (PageLocked(page))
+                return wait_on_page_bit_killable(page, PG_locked);
+        return 0;
+}
+
 /* 
  * Wait for a page to be unlocked.
  *
@@ -442,8 +458,9 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
                                 pgoff_t index, gfp_t gfp_mask);
 int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
                                 pgoff_t index, gfp_t gfp_mask);
-extern void remove_from_page_cache(struct page *page);
-extern void __remove_from_page_cache(struct page *page);
+extern void delete_from_page_cache(struct page *page);
+extern void __delete_from_page_cache(struct page *page);
+int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask);
 
 /*
  * Like add_to_page_cache_locked, but used to add newly allocated pages: