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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/pid.h
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@@ -3,8 +3,9 @@
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 #define _LINUX_PID_H
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 #include <linux/rculist.h>
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-#include <linux/wait.h>
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 #include <linux/atomic.h>
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+#include <linux/wait.h>
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+#include <linux/refcount.h>
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 enum pid_type
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 {
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@@ -58,10 +59,12 @@
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 struct pid
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 {
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-	atomic_t count;
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+	refcount_t count;
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 	unsigned int level;
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+	spinlock_t lock;
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 	/* lists of tasks that use this pid */
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 	struct hlist_head tasks[PIDTYPE_MAX];
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+	struct hlist_head inodes;
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 	/* wait queue for pidfd notifications */
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 	wait_queue_head_t wait_pidfd;
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 	struct rcu_head rcu;
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@@ -72,15 +75,24 @@
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 extern const struct file_operations pidfd_fops;
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+struct file;
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+
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+extern struct pid *pidfd_pid(const struct file *file);
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+struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags);
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+
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 static inline struct pid *get_pid(struct pid *pid)
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 {
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 	if (pid)
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-		atomic_inc(&pid->count);
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+		refcount_inc(&pid->count);
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 	return pid;
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 }
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 extern void put_pid(struct pid *pid);
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 extern struct task_struct *pid_task(struct pid *pid, enum pid_type);
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+static inline bool pid_has_task(struct pid *pid, enum pid_type type)
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+{
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+	return !hlist_empty(&pid->tasks[type]);
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+}
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 extern struct task_struct *get_pid_task(struct pid *pid, enum pid_type);
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 extern struct pid *get_task_pid(struct task_struct *task, enum pid_type type);
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@@ -92,11 +104,15 @@
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 extern void detach_pid(struct task_struct *task, enum pid_type);
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 extern void change_pid(struct task_struct *task, enum pid_type,
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 			struct pid *pid);
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+extern void exchange_tids(struct task_struct *task, struct task_struct *old);
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 extern void transfer_pid(struct task_struct *old, struct task_struct *new,
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 			 enum pid_type);
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 struct pid_namespace;
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 extern struct pid_namespace init_pid_ns;
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+
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+extern int pid_max;
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+extern int pid_max_min, pid_max_max;
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 /*
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  * look up a PID in the hash table. Must be called with the tasklist_lock
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@@ -115,9 +131,9 @@
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  */
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 extern struct pid *find_get_pid(int nr);
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 extern struct pid *find_ge_pid(int nr, struct pid_namespace *);
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-int next_pidmap(struct pid_namespace *pid_ns, unsigned int last);
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-extern struct pid *alloc_pid(struct pid_namespace *ns);
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+extern struct pid *alloc_pid(struct pid_namespace *ns, pid_t *set_tid,
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+			     size_t set_tid_size);
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 extern void free_pid(struct pid *pid);
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 extern void disable_pid_allocation(struct pid_namespace *ns);
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