text: /*
   * Copyright (C) 2010-2013 Junjiro R. Okajima
   *
   * This program, aufs is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   */
  
  /*
   * special support for filesystems which aqucires an inode mutex
   * at final closing a file, eg, hfsplus.
   *
   * This trick is very simple and stupid, just to open the file before really
   * neceeary open to tell hfsplus that this is not the final closing.
   * The caller should call au_h_open_pre() after acquiring the inode mutex,
   * and au_h_open_post() after releasing it.
   */
  
  #include "aufs.h"
  
  struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex)
  {
  	struct file *h_file;
  	struct dentry *h_dentry;
  
  	h_dentry = au_h_dptr(dentry, bindex);
  	AuDebugOn(!h_dentry);
  	AuDebugOn(!h_dentry->d_inode);
  	IMustLock(h_dentry->d_inode);
  
  	h_file = NULL;
  	if (au_test_hfsplus(h_dentry->d_sb)
  	    && S_ISREG(h_dentry->d_inode->i_mode))
  		h_file = au_h_open(dentry, bindex,
  				   O_RDONLY | O_NOATIME | O_LARGEFILE,
  				   /*file*/NULL);
  	return h_file;
  }
  
  void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
  		    struct file *h_file)
  {
  	if (h_file) {
  		fput(h_file);
  		au_sbr_put(dentry->d_sb, bindex);
  	}
  }
  