extern int nvm_get_sysblock(struct nvm_dev *, struct nvm_sb_info *);
extern int nvm_update_sysblock(struct nvm_dev *, struct nvm_sb_info *);
extern int nvm_init_sysblock(struct nvm_dev *, struct nvm_sb_info *);
extern int nvm_get_sysblock(struct nvm_dev *, struct nvm_sb_info *);
extern int nvm_update_sysblock(struct nvm_dev *, struct nvm_sb_info *);
extern int nvm_init_sysblock(struct nvm_dev *, struct nvm_sb_info *);