X-Git-Url: https://git.camperquake.de/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fvfs_compat.h;h=cbbf21e618b6ea5aa2c2230626a44d4f30ea2cc1;hb=12d06bac9b22b11d8a322dfea4bdb50b106c254f;hp=dce2b6f28127bf6b52587f733b967c07a5bb60fc;hpb=3117dd0b9005eb76e483b9772c493883b82998bb;p=zfs.git

diff --git a/include/linux/vfs_compat.h b/include/linux/vfs_compat.h
index dce2b6f..cbbf21e 100644
--- a/include/linux/vfs_compat.h
+++ b/include/linux/vfs_compat.h
@@ -41,4 +41,44 @@ insert_inode_locked(struct inode *ip)
 }
 #endif /* HAVE_INSERT_INODE_LOCKED */
 
+/*
+ * 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 */
+
 #endif /* _ZFS_VFS_H */