/*
* name_to_value - translate a string into an address
*
* The string may be one of two forms - 'symname' or 'modname:symname'.
* (We also accept 'unix:symname' as a synonymn for 'symname'.)
* The latter form causes a kobj_lookup() to occur only in the given module,
* the former causes a kobj_getsymvalue() on the entire kernel symbol table.
*
* mod_lock locking is not needed for the &modules list because
* modctl structures are never unlinked from the &modules list.
*/
int
name_to_value(char *name, uintptr_t *value)
{
register char *symname = name;
register char *modname = "";
char *p;
int retval = 0;
uintptr_t symvalue = 0;
char c = (char)0;
/*
* we take names of the form: "modname:symbol", "unix:symbol", "symbol"
*/
if ((p = strchr(name, ':')) != NULL && p[1] != (char)0) {
symname = p + 1;
modname = name;
c = *p;
*p = (char)0;
}
if (*modname == (char)0) {
symvalue = kobj_getsymvalue(symname, 0);
} else {
struct modctl *mp = &modules;
do {
if (strcmp(modname, mp->mod_modname) == 0) {
symvalue = kobj_lookup(mp->mod_mp, symname);
break;
}
} while ((mp = mp->mod_next) != &modules);
}
if (symvalue == 0)
retval = -1;
if (c != (char)0) /* Restore incoming cstr */
*p = c;
*value = symvalue;
return (retval);
}
/**
* get_gendisk - get partitioning information for a given device
* @dev: device to get partitioning information for
*
* This function gets the structure containing partitioning
* information for the given device @dev.
*/
struct gendisk *get_gendisk(dev_t dev, int *part)
{
struct kobject *kobj = kobj_lookup(bdev_map, dev, part);
return kobj ? to_disk(kobj) : NULL;
}
