/*
       *  linux/fs/ext2/fsync.c
       *
       *  Copyright (C) 1993  Stephen Tweedie (sct@dcs.ed.ac.uk)
       *  from
       *  Copyright (C) 1992  Remy Card (card@masi.ibp.fr)
       *                      Laboratoire MASI - Institut Blaise Pascal
       *                      Universite Pierre et Marie Curie (Paris VI)
       *  from
       *  linux/fs/minix/truncate.c   Copyright (C) 1991, 1992  Linus Torvalds
       * 
       *  ext2fs fsync primitive
       *
       *  Big-endian to little-endian byte-swapping/bitmaps by
       *        David S. Miller (davem@caip.rutgers.edu), 1995
       * 
       *  Removed unnecessary code duplication for little endian machines
       *  and excessive __inline__s. 
       *        Andi Kleen, 1997
       *
       * Major simplications and cleanup - we only need to do the metadata, because
       * we can depend on generic_block_fdatasync() to sync the data blocks.
       */
      
      #include <linux/fs.h>
      #include <linux/ext2_fs.h>
      #include <linux/locks.h>
      #include <linux/smp_lock.h>
      
      
      /*
       *	File may be NULL when we are called. Perhaps we shouldn't
       *	even pass file to fsync ?
       */
      
  36  int ext2_sync_file(struct file * file, struct dentry *dentry, int datasync)
      {
      	struct inode *inode = dentry->d_inode;
  39  	return ext2_fsync_inode(inode, datasync);
      }
      
  42  int ext2_fsync_inode(struct inode *inode, int datasync)
      {
      	int err;
      	
      	err  = fsync_inode_buffers(inode);
  47  	if (!(inode->i_state & I_DIRTY))
  48  		return err;
  49  	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
  50  		return err;
      	
      	err |= ext2_sync_inode(inode);
  53  	return err ? -EIO : 0;
      }