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Make grub_util_devmapper_part_to_disk and grub_util_find_partition_start

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follow the same algorithm to avoid method mismatch. Don't assume
	DMRAID- UUID to mean full disk but instead check that mapping is linear.
This commit is contained in:
Vladimir Serbinenko 2013-12-24 14:16:57 +01:00
parent da98622662
commit e88f0420b9
6 changed files with 35 additions and 127 deletions
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123
grub-core/osdep/devmapper/getroot.c
View file

@ -198,124 +198,17 @@ char *
grub_util_devmapper_part_to_disk (struct stat *st,
int *is_part, const char *path)
{
struct dm_tree *tree;
uint32_t maj, min;
struct dm_tree_node *node = NULL, *child;
void *handle;
const char *node_uuid, *mapper_name = NULL, *child_uuid, *child_name;
int major, minor;
tree = dm_tree_create ();
if (! tree)
if (grub_util_get_dm_node_linear_info (st->st_rdev,
&major, &minor, 0))
{
grub_util_info ("dm_tree_create failed");
goto devmapper_out;
*is_part = 1;
return grub_find_device ("/dev",
(major << 8) | minor);
}
maj = major (st->st_rdev);
min = minor (st->st_rdev);
if (! dm_tree_add_dev (tree, maj, min))
{
grub_util_info ("dm_tree_add_dev failed");
goto devmapper_out;
}
node = dm_tree_find_node (tree, maj, min);
if (! node)
{
grub_util_info ("dm_tree_find_node failed");
goto devmapper_out;
}
reiterate:
node_uuid = dm_tree_node_get_uuid (node);
if (! node_uuid)
{
grub_util_info ("%s has no DM uuid", path);
goto devmapper_out;
}
if (strncmp (node_uuid, "LVM-", 4) == 0)
{
grub_util_info ("%s is an LVM", path);
goto devmapper_out;
}
if (strncmp (node_uuid, "mpath-", 6) == 0)
{
/* Multipath partitions have partN-mpath-* UUIDs, and are
linear mappings so are handled by
grub_util_get_dm_node_linear_info. Multipath disks are not
linear mappings and must be handled specially. */
grub_util_info ("%s is a multipath disk", path);
goto devmapper_out;
}
if (strncmp (node_uuid, "DMRAID-", 7) != 0)
{
int major, minor;
const char *node_name;
grub_util_info ("%s is not DM-RAID", path);
if ((node_name = dm_tree_node_get_name (node))
&& grub_util_get_dm_node_linear_info (node_name,
&major, &minor, 0))
{
*is_part = 1;
if (tree)
dm_tree_free (tree);
char *ret = grub_find_device ("/dev",
(major << 8) | minor);
return ret;
}
goto devmapper_out;
}
handle = NULL;
/* Counter-intuitively, device-mapper refers to the disk-like
device containing a DM-RAID partition device as a "child" of
the partition device. */
child = dm_tree_next_child (&handle, node, 0);
if (! child)
{
grub_util_info ("%s has no DM children", path);
goto devmapper_out;
}
child_uuid = dm_tree_node_get_uuid (child);
if (! child_uuid)
{
grub_util_info ("%s child has no DM uuid", path);
goto devmapper_out;
}
else if (strncmp (child_uuid, "DMRAID-", 7) != 0)
{
grub_util_info ("%s child is not DM-RAID", path);
goto devmapper_out;
}
child_name = dm_tree_node_get_name (child);
if (! child_name)
{
grub_util_info ("%s child has no DM name", path);
goto devmapper_out;
}
mapper_name = child_name;
*is_part = 1;
node = child;
goto reiterate;
devmapper_out:
if (! mapper_name && node)
{
/* This is a DM-RAID disk, not a partition. */
mapper_name = dm_tree_node_get_name (node);
if (! mapper_name)
grub_util_info ("%s has no DM name", path);
}
char *ret;
if (mapper_name)
ret = xasprintf ("/dev/mapper/%s", mapper_name);
else
ret = NULL;
if (tree)
dm_tree_free (tree);
return ret;
*is_part = 0;
return xstrdup (path);
}
int