9 #include <linux/pid.h>
58 	struct pid *pid_a = rb_entry(a, struct pid, pidfs_node);  in pidfs_ino_cmp()
59 	struct pid *pid_b = rb_entry(b, struct pid, pidfs_node);  in pidfs_ino_cmp()
70 void pidfs_add_pid(struct pid *pid)  in pidfs_add_pid()  argument
76 	 * to struct pid is the inode number.  in pidfs_add_pid()
78 	 * On 32 bit the 64 bit number assigned to struct pid is split  in pidfs_add_pid()
102 	pid->ino = pidfs_ino_nr;  in pidfs_add_pid()
103 	pid->stashed = NULL;  in pidfs_add_pid()
107 	rb_find_add_rcu(&pid->pidfs_node, &pidfs_ino_tree, pidfs_ino_cmp);  in pidfs_add_pid()
111 void pidfs_remove_pid(struct pid *pid)  in pidfs_remove_pid()  argument
114 	rb_erase(&pid->pidfs_node, &pidfs_ino_tree);  in pidfs_remove_pid()
124  * Pid:
125  * This function will print the pid that a given pidfd refers to in the
126  * pid namespace of the procfs instance.
127  * If the pid namespace of the process is not a descendant of the pid
128  * namespace of the procfs instance 0 will be shown as its pid. This is
130  * its pid namespace.
133  * If pid namespaces are supported then this function will also print
134  * the pid of a given pidfd refers to for all descendant pid namespaces
135  * starting from the current pid namespace of the instance, i.e. the
136  * Pid field and the first entry in the NSpid field will be identical.
137  * If the pid namespace of the process is not a descendant of the pid
140  * Note that this differs from the Pid and NSpid fields in
141  * /proc/<pid>/status where Pid and NSpid are always shown relative to
142  * the  pid namespace of the procfs instance. The difference becomes
143  * obvious when sending around a pidfd between pid namespaces from a
145  * present between the pid namespaces:
146  * - create two new pid namespaces ns1 and ns2 in the initial pid
148  *   new pid namespace and mount procfs)
151  * - read /proc/self/fdinfo/<pidfd> and observe that both Pid and NSpid
156 	struct pid *pid = pidfd_pid(f);  in pidfd_show_fdinfo()  local
160 	if (likely(pid_has_task(pid, PIDTYPE_PID))) {  in pidfd_show_fdinfo()
162 		nr = pid_nr_ns(pid, ns);  in pidfd_show_fdinfo()
165 	seq_put_decimal_ll(m, "Pid:\t", nr);  in pidfd_show_fdinfo()
172 		/* If nr is non-zero it means that 'pid' is valid and that  in pidfd_show_fdinfo()
173 		 * ns, i.e. the pid namespace associated with the procfs  in pidfd_show_fdinfo()
174 		 * instance, is in the pid namespace hierarchy of pid.  in pidfd_show_fdinfo()
177 		for (i = ns->level + 1; i <= pid->level; i++)  in pidfd_show_fdinfo()
178 			seq_put_decimal_ll(m, "\t", pid->numbers[i].nr);  in pidfd_show_fdinfo()
190 	struct pid *pid = pidfd_pid(file);  in pidfd_poll()  local
195 	poll_wait(file, &pid->wait_pidfd, pts);  in pidfd_poll()
201 	task = pid_task(pid, PIDTYPE_PID);  in pidfd_poll()
257 	 * Copy pid/tgid last, to reduce the chances the information might be  in pidfd_info()
267 	kinfo.pid = task_pid_vnr(task);  in pidfd_info()
270 	if (kinfo.pid == 0 || kinfo.tgid == 0 || (kinfo.ppid == 0 && kinfo.pid != 1))  in pidfd_info()
320 	struct pid *pid = pidfd_pid(file);  in pidfd_ioctl()  local
335 	task = get_pid_task(pid, PIDTYPE_PID);  in pidfd_ioctl()
446 struct pid *pidfd_pid(const struct file *file)  in pidfd_pid()
502 	struct pid *pid = inode->i_private;  in pidfs_evict_inode()  local
505 	put_pid(pid);  in pidfs_evict_inode()
531 	const struct pid *pid = inode->i_private;  in pidfs_encode_fh()  local
539 	*(u64 *)fh = pid->ino;  in pidfs_encode_fh()
546 	const struct pid *pid = rb_entry(node, struct pid, pidfs_node);  in pidfs_ino_find()  local
548 	if (pid_ino < pid->ino)  in pidfs_ino_find()
550 	if (pid_ino > pid->ino)  in pidfs_ino_find()
555 /* Find a struct pid based on the inode number. */
556 static struct pid *pidfs_ino_get_pid(u64 ino)  in pidfs_ino_get_pid()
558 	struct pid *pid;  in pidfs_ino_get_pid()  local
573 	pid = rb_entry(node, struct pid, pidfs_node);  in pidfs_ino_get_pid()
575 	/* Within our pid namespace hierarchy? */  in pidfs_ino_get_pid()
576 	if (pid_vnr(pid) == 0)  in pidfs_ino_get_pid()
579 	return get_pid(pid);  in pidfs_ino_get_pid()
589 	struct pid *pid;  in pidfs_fh_to_dentry()  local
602 	pid = pidfs_ino_get_pid(pid_ino);  in pidfs_fh_to_dentry()
603 	if (!pid)  in pidfs_fh_to_dentry()
606 	ret = path_from_stashed(&pid->stashed, pidfs_mnt, pid, &path);  in pidfs_fh_to_dentry()
629 	 * pidfd_ino_get_pid() will verify that the struct pid is part  in pidfs_export_permission()
630 	 * of the caller's pid namespace hierarchy. No further  in pidfs_export_permission()
655 	const struct pid *pid = data;  in pidfs_init_inode()  local
662 	inode->i_ino = pidfs_ino(pid->ino);  in pidfs_init_inode()
663 	inode->i_generation = pidfs_gen(pid->ino);  in pidfs_init_inode()
669 	struct pid *pid = data;  in pidfs_put_data()  local
670 	put_pid(pid);  in pidfs_put_data()
699 struct file *pidfs_alloc_file(struct pid *pid, unsigned int flags)  in pidfs_alloc_file()  argument
706 	ret = path_from_stashed(&pid->stashed, pidfs_mnt, get_pid(pid), &path);  in pidfs_alloc_file()