struct file *file;
struct pid_namespace *ns;
struct timer_list timer;
+ struct list_head list;
};
static DEFINE_SPINLOCK(acct_lock);
-
-static struct bsd_acct_struct acct_globals __cacheline_aligned;
+static LIST_HEAD(acct_list);
/*
* Called whenever the timer says to check the free space.
*
* NOTE: acct_lock MUST be held on entry and exit.
*/
-static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file)
+static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
+ struct pid_namespace *ns)
{
struct file *old_acct = NULL;
struct pid_namespace *old_ns = NULL;
acct->active = 0;
acct->needcheck = 0;
acct->file = NULL;
+ acct->ns = NULL;
+ list_del(&acct->list);
}
if (file) {
acct->file = file;
- acct->ns = get_pid_ns(task_active_pid_ns(current));
+ acct->ns = ns;
acct->needcheck = 0;
acct->active = 1;
+ list_add(&acct->list, &acct_list);
/* It's been deleted if it was used before so this is safe */
setup_timer(&acct->timer, acct_timeout, (unsigned long)acct);
acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ;
spin_unlock(&acct_lock);
do_acct_process(acct, old_ns, old_acct);
filp_close(old_acct, NULL);
- put_pid_ns(old_ns);
spin_lock(&acct_lock);
}
}
{
struct file *file;
int error;
+ struct pid_namespace *ns;
+ struct bsd_acct_struct *acct = NULL;
/* Difference from BSD - they don't do O_APPEND */
file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0);
return -EIO;
}
+ ns = task_active_pid_ns(current);
+ if (ns->bacct == NULL) {
+ acct = kzalloc(sizeof(struct bsd_acct_struct), GFP_KERNEL);
+ if (acct == NULL) {
+ filp_close(file, NULL);
+ return -ENOMEM;
+ }
+ }
+
error = security_acct(file);
if (error) {
+ kfree(acct);
filp_close(file, NULL);
return error;
}
spin_lock(&acct_lock);
+ if (ns->bacct == NULL) {
+ ns->bacct = acct;
+ acct = NULL;
+ }
+
mnt_pin(file->f_path.mnt);
- acct_file_reopen(&acct_globals, file);
+ acct_file_reopen(ns->bacct, file, ns);
spin_unlock(&acct_lock);
mntput(file->f_path.mnt); /* it's pinned, now give up active reference */
+ kfree(acct);
return 0;
}
error = acct_on(tmp);
putname(tmp);
} else {
+ struct bsd_acct_struct *acct;
+
+ acct = task_active_pid_ns(current)->bacct;
+ if (acct == NULL)
+ return 0;
+
error = security_acct(NULL);
if (!error) {
spin_lock(&acct_lock);
- acct_file_reopen(&acct_globals, NULL);
+ acct_file_reopen(acct, NULL, NULL);
spin_unlock(&acct_lock);
}
}
*/
void acct_auto_close_mnt(struct vfsmount *m)
{
+ struct bsd_acct_struct *acct;
+
spin_lock(&acct_lock);
- if (acct_globals.file && acct_globals.file->f_path.mnt == m)
- acct_file_reopen(&acct_globals, NULL);
+restart:
+ list_for_each_entry(acct, &acct_list, list)
+ if (acct->file && acct->file->f_path.mnt == m) {
+ acct_file_reopen(acct, NULL, NULL);
+ goto restart;
+ }
spin_unlock(&acct_lock);
}
*/
void acct_auto_close(struct super_block *sb)
{
+ struct bsd_acct_struct *acct;
+
+ spin_lock(&acct_lock);
+restart:
+ list_for_each_entry(acct, &acct_list, list)
+ if (acct->file && acct->file->f_path.mnt->mnt_sb == sb) {
+ acct_file_reopen(acct, NULL, NULL);
+ goto restart;
+ }
+ spin_unlock(&acct_lock);
+}
+
+void acct_exit_ns(struct pid_namespace *ns)
+{
+ struct bsd_acct_struct *acct;
+
spin_lock(&acct_lock);
- if (acct_globals.file &&
- acct_globals.file->f_path.mnt->mnt_sb == sb) {
- acct_file_reopen(&acct_globals, NULL);
+ acct = ns->bacct;
+ if (acct != NULL) {
+ if (acct->file != NULL)
+ acct_file_reopen(acct, NULL, NULL);
+
+ kfree(acct);
}
spin_unlock(&acct_lock);
}
#endif
spin_lock_irq(¤t->sighand->siglock);
- tty = current->signal->tty;
+ tty = current->signal->tty; /* Safe as we hold the siglock */
ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0;
ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime)));
ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime)));
spin_unlock_irq(¤t->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;
+ struct bsd_acct_struct *acct;
+ acct = ns->bacct;
/*
* accelerate the common fastpath:
*/
- if (!acct_globals.file)
+ if (!acct || !acct->file)
return;
spin_lock(&acct_lock);
- file = acct_globals.file;
+ file = acct->file;
if (unlikely(!file)) {
spin_unlock(&acct_lock);
return;
}
get_file(file);
- ns = get_pid_ns(acct_globals.ns);
spin_unlock(&acct_lock);
- do_acct_process(&acct_globals, ns, file);
+ do_acct_process(acct, ns, file);
fput(file);
- put_pid_ns(ns);
+}
+
+/**
+ * acct_process - now just a wrapper around acct_process_in_ns,
+ * which in turn is a wrapper around do_acct_process.
+ *
+ * handles process accounting for an exiting task
+ */
+void acct_process(void)
+{
+ struct pid_namespace *ns;
+
+ /*
+ * This loop is safe lockless, since current is still
+ * alive and holds its namespace, which in turn holds
+ * its parent.
+ */
+ for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent)
+ acct_process_in_ns(ns);
}