/*
 *  fs/snap/snap.c
 *
 *  A snap shot file system.
 *
 */

#define DEBUG_SUBSYSTEM S_SM

#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "smfs_internal.h" 


static void smfs_read_inode(struct inode *inode)
{
	struct super_block *cache_sb;
	struct inode *cache_inode;	
	ENTRY;

	if (!inode) 
		return;
	
	CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
	cache_sb = S2CSB(inode->i_sb);

	cache_inode = new_inode(cache_sb);
	I2CI(inode) = cache_inode;
	
	if(cache_sb && cache_sb->s_op->read_inode)
		cache_sb->s_op->read_inode(cache_inode);

	CDEBUG(D_INODE, "read_inode ino %lu icount %d \n", 
	       inode->i_ino, atomic_read(&inode->i_count));

	sm_set_inode_ops(cache_inode, inode);
	
	CDEBUG(D_INODE, "read_inode ino %lu icount %d \n", 
	       inode->i_ino, atomic_read(&inode->i_count));
	
	return; 
}
/* Although some filesystem(such as ext3) do not have
 * clear_inode method, but we need it to free the 
 * cache inode 
 */
static void smfs_clear_inode(struct inode *inode)
{
	struct super_block *cache_sb;
	struct inode *cache_inode;	

	ENTRY;
	
	if (!inode) return;
	
	cache_sb = S2CSB(inode->i_sb);
	cache_inode = I2CI(inode);
	clear_inode(cache_inode);
	return;	
}

struct super_operations smfs_super_ops = {
	read_inode:	smfs_read_inode,
	clear_inode:	smfs_clear_inode,
	put_super:	smfs_put_super,
};