Revert "ecryptfs: modify write path to encrypt page in writepage"

fs/ecryptfs/super.c

 /**
  * eCryptfs: Linux filesystem encryption layer
  *
  * Copyright (C) 1997-2003 Erez Zadok
  * Copyright (C) 2001-2003 Stony Brook University
  * Copyright (C) 2004-2006 International Business Machines Corp.
  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
  *              Michael C. Thompson <mcthomps@us.ibm.com>
  *
  * This program is free software; you can redistribute it and/or
@@ skipping 37 matching lines @@
  */
 static struct inode *ecryptfs_alloc_inode(struct super_block *sb)
 {
         struct ecryptfs_inode_info *inode_info;
         struct inode *inode = NULL;
 
         inode_info = kmem_cache_alloc(ecryptfs_inode_info_cache, GFP_KERNEL);
         if (unlikely(!inode_info))
                 goto out;
         ecryptfs_init_crypt_stat(&inode_info->crypt_stat);
+        mutex_init(&inode_info->lower_file_mutex);
         inode_info->lower_file = NULL;
         inode = &inode_info->vfs_inode;
 out:
         return inode;
 }
 
 /**
  * ecryptfs_destroy_inode
  * @inode: The ecryptfs inode
  *
@@ skipping 124 matching lines @@
                 seq_printf(m, ",ecryptfs_encrypted_view");
         if (mount_crypt_stat->flags & ECRYPTFS_UNLINK_SIGS)
                 seq_printf(m, ",ecryptfs_unlink_sigs");
 
         return 0;
 }
 
 const struct super_operations ecryptfs_sops = {
         .alloc_inode = ecryptfs_alloc_inode,
         .destroy_inode = ecryptfs_destroy_inode,
-        .drop_inode = generic_drop_inode,
+        .drop_inode = generic_delete_inode,
         .put_super = ecryptfs_put_super,
         .statfs = ecryptfs_statfs,
         .remount_fs = NULL,
         .clear_inode = ecryptfs_clear_inode,
         .show_options = ecryptfs_show_options
 };