diff options
| -rw-r--r-- | include/linux/pid.h | 2 | ||||
| -rw-r--r-- | kernel/fork.c | 2 | ||||
| -rw-r--r-- | kernel/pid.c | 49 |
3 files changed, 36 insertions, 17 deletions
diff --git a/include/linux/pid.h b/include/linux/pid.h index e5865a9c58a..67470ade321 100644 --- a/include/linux/pid.h +++ b/include/linux/pid.h @@ -111,7 +111,7 @@ extern struct pid *FASTCALL(find_pid(int nr)); extern struct pid *find_get_pid(int nr); extern struct pid *find_ge_pid(int nr); -extern struct pid *alloc_pid(void); +extern struct pid *alloc_pid(struct pid_namespace *ns); extern void FASTCALL(free_pid(struct pid *pid)); static inline pid_t pid_nr(struct pid *pid) diff --git a/kernel/fork.c b/kernel/fork.c index d2f4a420a5b..984d259e172 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1041,7 +1041,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, goto bad_fork_cleanup_put_domain; if (pid != &init_struct_pid) { - pid = alloc_pid(); + pid = alloc_pid(task_active_pid_ns(p)); if (!pid) goto bad_fork_put_binfmt_module; } diff --git a/kernel/pid.c b/kernel/pid.c index c7346fb801f..8132a6ddfa1 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -29,7 +29,8 @@ #include <linux/pid_namespace.h> #include <linux/init_task.h> -#define pid_hashfn(nr) hash_long((unsigned long)nr, pidhash_shift) +#define pid_hashfn(nr, ns) \ + hash_long((unsigned long)nr + (unsigned long)ns, pidhash_shift) static struct hlist_head *pid_hash; static int pidhash_shift; struct pid init_struct_pid = INIT_STRUCT_PID; @@ -186,11 +187,13 @@ fastcall void put_pid(struct pid *pid) if (!pid) return; - /* FIXME - this must be the namespace this pid lives in */ - ns = &init_pid_ns; + ns = pid->numbers[pid->level].ns; if ((atomic_read(&pid->count) == 1) || - atomic_dec_and_test(&pid->count)) + atomic_dec_and_test(&pid->count)) { kmem_cache_free(ns->pid_cachep, pid); + if (ns != &init_pid_ns) + put_pid_ns(ns); + } } EXPORT_SYMBOL_GPL(put_pid); @@ -203,45 +206,61 @@ static void delayed_put_pid(struct rcu_head *rhp) fastcall void free_pid(struct pid *pid) { /* We can be called with write_lock_irq(&tasklist_lock) held */ + int i; unsigned long flags; spin_lock_irqsave(&pidmap_lock, flags); hlist_del_rcu(&pid->pid_chain); spin_unlock_irqrestore(&pidmap_lock, flags); - free_pidmap(&init_pid_ns, pid->nr); + for (i = 0; i <= pid->level; i++) + free_pidmap(pid->numbers[i].ns, pid->numbers[i].nr); + call_rcu(&pid->rcu, delayed_put_pid); } -struct pid *alloc_pid(void) +struct pid *alloc_pid(struct pid_namespace *ns) { struct pid *pid; enum pid_type type; - int nr = -1; - struct pid_namespace *ns; + int i, nr; + struct pid_namespace *tmp; - ns = task_active_pid_ns(current); pid = kmem_cache_alloc(ns->pid_cachep, GFP_KERNEL); if (!pid) goto out; - nr = alloc_pidmap(ns); - if (nr < 0) - goto out_free; + tmp = ns; + for (i = ns->level; i >= 0; i--) { + nr = alloc_pidmap(tmp); + if (nr < 0) + goto out_free; + pid->numbers[i].nr = nr; + pid->numbers[i].ns = tmp; + tmp = tmp->parent; + } + + if (ns != &init_pid_ns) + get_pid_ns(ns); + + pid->level = ns->level; + pid->nr = pid->numbers[0].nr; atomic_set(&pid->count, 1); - pid->nr = nr; for (type = 0; type < PIDTYPE_MAX; ++type) INIT_HLIST_HEAD(&pid->tasks[type]); spin_lock_irq(&pidmap_lock); - hlist_add_head_rcu(&pid->pid_chain, &pid_hash[pid_hashfn(pid->nr)]); + hlist_add_head_rcu(&pid->pid_chain, &pid_hash[pid_hashfn(pid->nr, ns)]); spin_unlock_irq(&pidmap_lock); out: return pid; out_free: + for (i++; i <= ns->level; i++) + free_pidmap(pid->numbers[i].ns, pid->numbers[i].nr); + kmem_cache_free(ns->pid_cachep, pid); pid = NULL; goto out; @@ -253,7 +272,7 @@ struct pid * fastcall find_pid(int nr) struct pid *pid; hlist_for_each_entry_rcu(pid, elem, - &pid_hash[pid_hashfn(nr)], pid_chain) { + &pid_hash[pid_hashfn(nr, &init_pid_ns)], pid_chain) { if (pid->nr == nr) return pid; } |