[PATCH 03/12] pidfd: use __anon_inode_getfd

[Christoph Hellwig]

Use __anon_inode_getfd instead of opencoding the logic using
get_unused_fd_flags + anon_inode_getfile.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 kernel/fork.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 4385f3d639f23..31e0face01072 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2113,19 +2113,11 @@ static __latent_entropy struct task_struct 
*copy_process(
         * if the fd table isn't shared).
         */
        if (clone_flags & CLONE_PIDFD) {
-               retval = get_unused_fd_flags(O_RDWR | O_CLOEXEC);
+               retval = __anon_inode_getfd("[pidfd]", &pidfd_fops, pid,
+                               O_RDWR | O_CLOEXEC, &pidfile);
                if (retval < 0)
                        goto bad_fork_free_pid;
-
                pidfd = retval;
-
-               pidfile = anon_inode_getfile("[pidfd]", &pidfd_fops, pid,
-                                             O_RDWR | O_CLOEXEC);
-               if (IS_ERR(pidfile)) {
-                       put_unused_fd(pidfd);
-                       retval = PTR_ERR(pidfile);
-                       goto bad_fork_free_pid;
-               }
                get_pid(pid);   /* held by pidfile now */
 
                retval = put_user(pidfd, args->pidfd);
-- 
2.26.2