Ramfs and Ram Disk pages are unevictable

[mirror_ubuntu-zesty-kernel.git] / include / linux / pagemap.h

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 5da31c12101c2e459524f0073a0af4f2f5dd7357..09164d2c5c2793eb1a553198c1a4c0c9899e3bdf 100644 (file)
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -32,6 +32,28 @@ static inline void mapping_set_error(struct address_space *mapping, int error)
        }
 }
 
+#ifdef CONFIG_UNEVICTABLE_LRU
+#define AS_UNEVICTABLE (__GFP_BITS_SHIFT + 2)  /* e.g., ramdisk, SHM_LOCK */
+
+static inline void mapping_set_unevictable(struct address_space *mapping)
+{
+       set_bit(AS_UNEVICTABLE, &mapping->flags);
+}
+
+static inline int mapping_unevictable(struct address_space *mapping)
+{
+       if (mapping && (mapping->flags & AS_UNEVICTABLE))
+               return 1;
+       return 0;
+}
+#else
+static inline void mapping_set_unevictable(struct address_space *mapping) { }
+static inline int mapping_unevictable(struct address_space *mapping)
+{
+       return 0;
+}
+#endif
+
 static inline gfp_t mapping_gfp_mask(struct address_space * mapping)
 {
        return (__force gfp_t)mapping->flags & __GFP_BITS_MASK;