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ns: Introduce ns walking helper

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov
2014-10-09 17:42:40 +04:00
parent e1072b935a
commit 16971e47cd
2 changed files with 41 additions and 0 deletions
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1
include/namespaces.h
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@@ -46,6 +46,7 @@ extern unsigned long root_ns_mask;
extern const struct fdtype_ops nsfile_dump_ops;
extern struct collect_image_info nsfile_cinfo;
extern int walk_namespaces(struct ns_desc *nd, int (*cb)(struct ns_id *, void *), void *oarg);
extern int collect_namespaces(bool for_dump);
extern int collect_mnt_namespaces(void);
extern int dump_mnt_namespaces(void);

40
namespaces.c
View File

@@ -177,6 +177,46 @@ struct ns_id *lookup_ns_by_id(unsigned int id, struct ns_desc *nd)
return NULL;
}
/*
* For all namespaces we support, there are two supported
* tasks-to-namespaces layout.
*
* If root task lives in the same namespace as criu does
* all other tasks should live in it too and we do NOT dump
* this namespace. On restore tasks inherit the respective
* namespace from criu.
*
* If root task lives in its own namespace, then all other
* tasks may live in it. Sometimes (CLONE_SUBNS) there can
* be more than one namespace of that type. For this case
* we dump all namespace's info and recreate them on restore.
*/
int walk_namespaces(struct ns_desc *nd, int (*cb)(struct ns_id *, void *), void *oarg)
{
int ret = 0;
struct ns_id *ns;
for (ns = ns_ids; ns != NULL; ns = ns->next) {
if (ns->nd != nd)
continue;
if (ns->pid == getpid()) {
if (root_ns_mask & nd->cflag)
continue;
ret = cb(ns, oarg);
break;
}
ret = cb(ns, oarg);
if (ret)
break;
}
return ret;
}
static unsigned int generate_ns_id(int pid, unsigned int kid, struct ns_desc *nd,
struct ns_id **ns_ret)
{