bsdacct: account dying tasks in all relevant namespaces (7d1e1350) · Commits · 戴 / test

This just makes the acct_proces walk the pid namespaces from current up to the top and account a task in each with the accounting turned on. ns->parent access if safe lockless, since current it still alive and holds its namespace, which in turn holds its parent. Signed-off-by:

Pavel Emelyanov <xemul@openvz.org> Cc: Balbir Singh <balbir@in.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

kernel/acct.c

+14 −7

Original line number	Diff line number	Diff line
		@@ -631,15 +631,9 @@ void acct_collect(long exitcode, int group_dead)
		spin_unlock_irq(&current->sighand->siglock);
		}

		/**
		* acct_process - now just a wrapper around do_acct_process
		*
		* handles process accounting for an exiting task
		*/
		void acct_process(void)
		static void acct_process_in_ns(struct pid_namespace *ns)
		{
		struct file *file = NULL;
		struct pid_namespace *ns = task_active_pid_ns(current);
		struct bsd_acct_struct *acct;

		acct = ns->bacct;
		@@ -661,3 +655,16 @@ void acct_process(void)
		do_acct_process(acct, ns, file);
		fput(file);
		}

		/**
		* acct_process - now just a wrapper around do_acct_process
		*
		* handles process accounting for an exiting task
		*/
		void acct_process(void)
		{
		struct pid_namespace *ns;

		for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent)
		acct_process_in_ns(ns);
		}

Admin message