checkfilesys
static int checkfilesys(const char *, char *, long, int);
int nret = checkfilesys(blockcheck(*argv++), 0, 0L, 0);
static int checkfilesys(const char *, const char *, int);
nret = checkfilesys(blockcheck(snap_dev), path, 0);
nret = checkfilesys(path, path, 0);
int nret = checkfilesys(blockcheck(*argv++), 0, 0L, 0);
static int checkfilesys(const char *, char *, long, int);
int checkfilesys(const char *);
erg = checkfilesys(*argv);
erg = checkfilesys(snap_dev);
erg = checkfilesys(*argv++);
static int checkfilesys(char *given_dev);
erg = checkfilesys(*argv++);