static char *lookup_dev(const char *dev_id)
{
uint32_t major, minor;
dev_t dev;
char *result = NULL, buf[PATH_MAX + 1];
if (sscanf(dev_id, "%" PRIu32 ":%" PRIu32, &major, &minor) != 2)
return NULL;
dev = makedev(major, minor);
strncpy(buf, DEVICE_DIR, PATH_MAX);
buf[PATH_MAX] = '\0';
/* First try low level device */
if ((result = __lookup_dev(buf, dev, 0, 0)))
return result;
/* If it is dm, try DM dir */
if (dm_is_dm_major(major)) {
strncpy(buf, dm_dir(), PATH_MAX);
if ((result = __lookup_dev(buf, dev, 0, 0)))
return result;
}
strncpy(buf, DEVICE_DIR, PATH_MAX);
result = __lookup_dev(buf, dev, 0, 4);
/* If not found, return NULL */
return result;
}
static int
grub_util_open_dm (const char *os_dev, struct dm_tree **tree,
struct dm_tree_node **node)
{
uint32_t maj, min;
struct stat st;
*node = NULL;
*tree = NULL;
if (stat (os_dev, &st) < 0)
return 0;
maj = major (st.st_rdev);
min = minor (st.st_rdev);
if (!dm_is_dm_major (maj))
return 0;
*tree = dm_tree_create ();
if (! *tree)
{
grub_puts_ (N_("Failed to create `device-mapper' tree"));
grub_dprintf ("hostdisk", "dm_tree_create failed\n");
return 0;
}
if (! dm_tree_add_dev (*tree, maj, min))
{
grub_dprintf ("hostdisk", "dm_tree_add_dev failed\n");
dm_tree_free (*tree);
*tree = NULL;
return 0;
}
*node = dm_tree_find_node (*tree, maj, min);
if (! *node)
{
grub_dprintf ("hostdisk", "dm_tree_find_node failed\n");
dm_tree_free (*tree);
*tree = NULL;
return 0;
}
return 1;
}