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dump: Save pstree_item's parent on item, not ppid

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This is trivial change, but is required to check for pgid/sid
are in 'restorable' state, see for respective patch/code for
details.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov
2012-04-11 22:07:47 +04:00
parent b17c49aa99
commit 2a0c526b6d
2 changed files with 19 additions and 11 deletions
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28
cr-dump.c
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@@ -1085,6 +1085,12 @@ static void pstree_switch_state(const struct list_head *list, int st)
unseize_task_and_threads(item, st);
}
static pid_t item_ppid(const struct pstree_item *item)
{
item = item->parent;
return item ? item->pid : -1;
}
static int seize_threads(const struct pstree_item *item)
{
int i = 0, ret;
@@ -1099,7 +1105,7 @@ static int seize_threads(const struct pstree_item *item)
continue;
pr_info("\tSeizing %d's %d thread\n", item->pid, item->threads[i]);
ret = seize_task(item->threads[i], item->ppid);
ret = seize_task(item->threads[i], item_ppid(item));
if (ret < 0)
goto err;
@@ -1140,7 +1146,8 @@ static int collect_threads(struct pstree_item *item)
return ret;
}
static struct pstree_item *collect_task(pid_t pid, pid_t ppid, struct list_head *list)
static struct pstree_item *collect_task(pid_t pid, struct pstree_item *parent,
struct list_head *list)
{
int ret;
struct pstree_item *item;
@@ -1149,13 +1156,14 @@ static struct pstree_item *collect_task(pid_t pid, pid_t ppid, struct list_head
if (!item)
goto err;
ret = seize_task(pid, ppid);
item->pid = pid;
item->parent = parent;
ret = seize_task(pid, item_ppid(item));
if (ret < 0)
goto err_free;
pr_info("Seized task %d, state %d\n", pid, ret);
item->pid = pid;
item->ppid = ppid;
item->state = ret;
ret = collect_threads(item);
@@ -1207,14 +1215,14 @@ static int check_subtree(const struct pstree_item *item)
return 0;
}
static int collect_subtree(pid_t pid, pid_t ppid, struct list_head *pstree_list,
int leader_only)
static int collect_subtree(pid_t pid, struct pstree_item *parent,
struct list_head *pstree_list, int leader_only)
{
struct pstree_item *item;
int i;
pr_info("Collecting tasks starting from %d\n", pid);
item = collect_task(pid, ppid, pstree_list);
item = collect_task(pid, parent, pstree_list);
if (item == NULL)
return -1;
@@ -1222,7 +1230,7 @@ static int collect_subtree(pid_t pid, pid_t ppid, struct list_head *pstree_list,
return 0;
for (i = 0; i < item->nr_children; i++)
if (collect_subtree(item->children[i], item->pid, pstree_list, 0) < 0)
if (collect_subtree(item->children[i], item, pstree_list, 0) < 0)
return -1;
if (check_subtree(item))
@@ -1241,7 +1249,7 @@ static int collect_dump_pstree(pid_t pid, struct list_head *pstree_list,
while (1) {
struct pstree_item *item;
ret = collect_subtree(pid, -1, pstree_list, opts->leader_only);
ret = collect_subtree(pid, NULL, pstree_list, opts->leader_only);
if (ret == 0) {
/*
* Some tasks could have been reparented to