1 files changed, 9 insertions, 0 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index f5ebdd87afb2..ddef482f1334 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3074,6 +3074,15 @@ static const struct file_operations proc_tgid_base_operations = {
         .llseek         = generic_file_llseek,
 };
 
+struct pid *tgid_pidfd_to_pid(const struct file *file)
+{
+        if (!d_is_dir(file->f_path.dentry) ||
+            (file->f_op != &proc_tgid_base_operations))
+                return ERR_PTR(-EBADF);
+
+        return proc_pid(file_inode(file));
+}
+
 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
 {
         return proc_pident_lookup(dir, dentry,