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Replicator: check open_count for parents of presuspend_node

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For deactivation of Replicator check in advance that all heads
have open_count == 0. For this presuspend_node is used as all
head nodes are linking this control node.
This commit is contained in:
Zdenek Kabelac 2010-05-21 12:30:35 +00:00
parent 76d1aec8e0
commit f3ef15ef6b
2 changed files with 44 additions and 1 deletions
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1
WHATS_NEW
View File

@ -1,5 +1,6 @@
Version 2.02.67 -
===============================
Checking open_count in all parents of presuspend_node.
Added dm_tree_node_set_presuspend_node() to presuspend child in deactivate.
Initial libdm support for Replicator target (API is not stable yet).
Extend process_each_lv_in_vg() with support for list of failed lvnames.

44
libdm/libdm-deptree.c
View File

@ -902,6 +902,44 @@ static int _info_by_dev(uint32_t major, uint32_t minor, int with_open_count,
return r;
}
/* Check if all parent nodes of given node have open_count == 0 */
static int _node_has_closed_parents(struct dm_tree_node *node,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
struct dm_tree_link *dlink;
const struct dm_info *dinfo;
struct dm_info info;
const char *uuid;
/* Iterate through parents of this node */
dm_list_iterate_items(dlink, &node->used_by) {
if (!(uuid = dm_tree_node_get_uuid(dlink->node))) {
stack;
continue;
}
/* Ignore if it doesn't belong to this VG */
if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
continue;
if (!(dinfo = dm_tree_node_get_info(dlink->node))) {
stack; /* FIXME Is this normal? */
return 0;
}
/* Refresh open_count */
if (!_info_by_dev(dinfo->major, dinfo->minor, 1, &info) ||
!info.exists)
continue;
if (info.open_count)
return 0;
}
return 1;
}
static int _deactivate_node(const char *name, uint32_t major, uint32_t minor,
uint32_t *cookie, uint16_t udev_flags)
{
@ -1100,7 +1138,11 @@ static int _dm_tree_deactivate_children(struct dm_tree_node *dnode,
!info.exists)
continue;
if (info.open_count) {
/* Also checking open_count in parent nodes of presuspend_node */
if (info.open_count ||
(child->presuspend_node &&
!_node_has_closed_parents(child->presuspend_node,
uuid_prefix, uuid_prefix_len))) {
/* Only report error from (likely non-internal) dependency at top level */
if (!level) {
log_error("Unable to deactivate open %s (%" PRIu32