[C] Errore "Structure has no member"

[Caleb]

qualcuno sa individuare l'errore qui dentro?

#include "linux/fs.h"
#include "linux/htfs_fs.h"


static inline int htfs_match (int len, const char * const name,
		                       struct htfs_direct * de)
{
   if (len != de->d_namlen)
      return 0;
   if (!de->d_ino)
      return 0;
   return !memcmp(name, de->d_name, len);
}


static struct buffer_head * htfs_find_entry(struct inode * dir,
	const char * name, int namelen, struct htfs_direct ** res_dir)
{
	struct super_block * sb;
	unsigned long pos, block, offset; /* pos = block * block_size + offset */
	struct buffer_head * bh;

	*res_dir = NULL;
	sb = dir->i_sb;
	if (namelen > HTFS_MAXNAMLEN) 
		return NULL;

	bh = NULL;
	pos = block = offset = 0;
	while (pos < dir->i_size) {
		if (!bh) {
			bh = htfs_file_bread(dir, block, 0);
			if (!bh) {
				/* offset = 0; */ block++;
				pos += sb->s_blocksize;
				continue;
			}
		}
		if (htfs_match(namelen, name,
			       *res_dir = (struct htfs_direct *) (bh->b_data + offset) ))
			return bh;
		pos += (*res_dir)->d_reclen;
		offset += (*res_dir)->d_reclen;
		if (offset < sb->sv_block_size)
			continue;
		brelse(bh);
		bh = NULL;
		offset = 0; block++;
	}
	brelse(bh);
	*res_dir = NULL;
	return NULL;
}

static struct dentry *htfs_lookup(struct inode * dir, struct dentry * dentry)
{
	struct inode * inode = NULL;
	struct htfs_direct * de;
	struct buffer_head * bh;

	bh = htfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
	
	
	if (bh) {
		int ino = de->d_ino;
		brelse(bh);
		inode = iget(dir->i_sb, ino);
	
		if (!inode) 
			return ERR_PTR(-EACCES);
	}
	d_add(dentry, inode);
	return NULL;
}

struct inode_operations htfs_dir_inode_operations = {
	lookup:        htfs_lookup
};

namei.c:64: structure has no member named 'sv_block_size'

ho frugato un po' fra gli header e ho visto che sv_block_size viene definito in include/linux/sysv_fs.h ma anche includendolo l'errore non cambia

qualche idea?