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bsdacct: account dying tasks in all relevant namespaces

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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 <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Pavel Emelyanov 2008-07-25 01:48:48 -07:00 • committed by Linus Torvalds
commit 7d1e13505b
1 changed files with 14 additions and 7 deletions
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21
kernel/acct.c
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@ -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);
}