+/*
+ * 2.6.35 API change,
+ * Add truncate_setsize() if it is not exported by the Linux kernel.
+ *
+ * Truncate the inode and pages associated with the inode. The pages are
+ * unmapped and removed from cache.
+ */
+#ifndef HAVE_TRUNCATE_SETSIZE
+static inline void
+truncate_setsize(struct inode *ip, loff_t new)
+{
+ struct address_space *mapping = ip->i_mapping;
+
+ i_size_write(ip, new);
+
+ unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
+ truncate_inode_pages(mapping, new);
+ unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
+}
+#endif /* HAVE_TRUNCATE_SETSIZE */
+
+/*
+ * 2.6.32 API change,
+ * Added backing_device_info (bdi) per super block interfaces. When
+ * available a bdi must be configured when using a non-device backed
+ * filesystem for proper writeback. It's safe to leave this code
+ * dormant for kernels which only support pdflush and not bdi.
+ */
+#ifdef HAVE_BDI
+#define bdi_get_sb(sb) (sb->s_bdi)
+#define bdi_put_sb(sb, bdi) (sb->s_bdi = bdi)
+#else
+#define bdi_init(bdi) (0)
+#define bdi_destroy(bdi) (0)
+#define bdi_register(bdi, parent, fmt, args) (0)
+#define bdi_unregister(bdi) (0)
+#define bdi_get_sb(sb) (0)
+#define bdi_put_sb(sb, bdi) (0)
+#endif /* HAVE_BDI */
+