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pid_ns: Extract functionality of exit of pid_ns helper in function

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This functionality will be moved in criu task in next patches,
the patch is a preparation.

v2: Rename the function and move pr_err() to it.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Kirill Tkhai 2017-07-14 15:40:15 +03:00 committed by Andrei Vagin
parent 67639620cb
commit ec1de7aeb1
2 changed files with 21 additions and 13 deletions
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1
criu/include/namespaces.h
View File

@ -283,6 +283,7 @@ static inline int pid_ns_root_off(void)
extern int reserve_pid_ns_helpers(void);
extern int create_pid_ns_helper(struct ns_id *ns);
extern int destroy_pid_ns_helpers(void);
extern void warn_if_pid_ns_helper_exited(pid_t real_pid);
extern int request_set_next_pid(int pid_ns_id, pid_t pid, int sk);
#endif /* __CR_NS_H__ */

33
criu/namespaces.c
View File

@ -1585,29 +1585,36 @@ static void unsc_msg_pid_fd(struct unsc_msg *um, pid_t *pid, int *fd)
}
}
void warn_if_pid_ns_helper_exited(pid_t real_pid)
{
struct ns_id *ns;
struct pid *pid;
for (ns = ns_ids; ns; ns = ns->next) {
if (ns->nd != &pid_ns_desc)
continue;
pid = __pstree_pid_by_virt(ns, ns->ns_pid);
if (pid->real == real_pid) {
pid->real = -1;
break;
}
}
if (ns)
pr_err("Spurious pid ns helper: pid=%d\n", real_pid);
}
static void usernsd_handler(int signal, siginfo_t *siginfo, void *data)
{
pid_t pid = siginfo->si_pid;
struct ns_id *ns;
struct pid *tpid;
int status;
while (pid) {
pid = waitpid(-1, &status, WNOHANG);
if (pid <= 0)
return;
for (ns = ns_ids; ns; ns = ns->next) {
if (ns->nd != &pid_ns_desc)
continue;
tpid = __pstree_pid_by_virt(ns, ns->ns_pid);
if (tpid->real == pid) {
tpid->real = -1;
break;
}
}
if (!ns)
pr_err("Spurious pid ns helper: pid=%d\n", pid);
warn_if_pid_ns_helper_exited(pid);
pr_err("%d finished unexpected: status=%d\n", pid, status);
futex_abort_and_wake(&task_entries->nr_in_progress);