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dump: don't check xids

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Now crtools can restore sid in all cases.
A restore of pgid will be added soon and now it will fail on restore.

It's prevent testing of restoring SIDs.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin 2012-06-22 00:39:00 +04:00 committed by Pavel Emelyanov
parent 8c4017d933
commit 325ff7b4ab
1 changed files with 0 additions and 58 deletions
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58
cr-dump.c
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@ -1035,60 +1035,6 @@ static int collect_threads(struct pstree_item *item)
return ret;
}
/*
* Few words about sid and pgid handling.
*
* An axiom: session can only be changed on self, group -- on self or
* on one of self children.
*
* Conclusions:
* 1. both should better be saved in pstree.img so we can restore sid
* at the time we fork kids and pgid is just for harmony;
* 2. if we seized the parent these IDs* shouldn't change and it's safe
* to read and check them right at the seizing time.
*
* Easings:
* 1. with the existing setsid we can only reset sid to task's pid.
* Thus, if task escaped from its ancestors with sid we will not be
* able to easily restore this construction. Thus for now this is
* treated as "unsupported" (FIXME);
*
* 2. when task whose pid is equal to pgid/sid (i.e. leader) exits we
* lose the ability to restore the grp/session easily with the
* existing interfaces, thus we also treat this as temporarily
* unsupported (FIXME #2).
*/
static int check_xids(struct pstree_item *root_item)
{
struct pstree_item *p, *tmp;
for_each_pstree_item(p) {
if (p->parent == NULL)
continue;
/* Easing #1 and #2 for sids */
if ((p->sid != p->pid.virt) && (p->sid != p->parent->sid)) {
pr_err("SID mismatch on %d (%d/%d)\n",
p->pid.virt, p->sid, p->parent->sid);
return -1;
}
/* Easing #2 for pgids */
for_each_pstree_item(tmp)
if (tmp->pid.virt == p->pgid)
break;
if (tmp == NULL) {
pr_err("PGIG mismatch on %d (%d)\n",
p->pid.virt, p->pgid);
return -1;
}
}
return 0;
}
static int collect_task(struct pstree_item *item)
{
int ret;
@ -1236,10 +1182,6 @@ static int dump_pstree(struct pstree_item *root_item)
pr_info("Dumping pstree (pid: %d)\n", root_item->pid.real);
pr_info("----------------------------------------\n");
ret = check_xids(root_item);
if (ret)
return -1;
pstree_fd = open_image(CR_FD_PSTREE, O_DUMP);
if (pstree_fd < 0)
return -1;