diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index 99b6f32..5109f1d 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -48,6 +48,11 @@
 	}
 
 	mutex_lock(&inode->i_mutex);
+
+	mutex_lock(&(REISERFS_I(inode)->i_mmap));
+	if (REISERFS_I(inode)->i_flags & i_ever_mapped)
+		REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
+
 	reiserfs_write_lock(inode->i_sb);
 	/* freeing preallocation only involves relogging blocks that
 	 * are already in the current transaction.  preallocation gets
@@ -100,11 +105,24 @@
 		err = reiserfs_truncate_file(inode, 0);
 	}
       out:
+	mutex_unlock(&(REISERFS_I(inode)->i_mmap));
 	mutex_unlock(&inode->i_mutex);
 	reiserfs_write_unlock(inode->i_sb);
 	return err;
 }
 
+static int reiserfs_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct inode *inode;
+
+	inode = file->f_path.dentry->d_inode;
+	mutex_lock(&(REISERFS_I(inode)->i_mmap));
+	REISERFS_I(inode)->i_flags |= i_ever_mapped;
+	mutex_unlock(&(REISERFS_I(inode)->i_mmap));
+
+	return generic_file_mmap(file, vma);
+}
+
 static void reiserfs_vfs_truncate_file(struct inode *inode)
 {
 	reiserfs_truncate_file(inode, 1);
@@ -1527,7 +1545,7 @@
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = reiserfs_compat_ioctl,
 #endif
-	.mmap = generic_file_mmap,
+	.mmap = reiserfs_file_mmap,
 	.open = generic_file_open,
 	.release = reiserfs_file_release,
 	.fsync = reiserfs_sync_file,