file: convert replace_fd() to FD_PREPARE()

Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-44-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/file.c b/fs/file.c
index 28743b742e3cf65b36227033d4e3ecd643108bd3..7ea33a61789677d4c4f5f4645b616502f8a350a4 100644 (file)
--- a/fs/file.c
+++ b/fs/file.c
@@ -1357,28 +1357,25 @@ out_unlock:
  */
 int receive_fd(struct file *file, int __user *ufd, unsigned int o_flags)
 {
-       int new_fd;
        int error;
 
        error = security_file_receive(file);
        if (error)
                return error;
 
-       new_fd = get_unused_fd_flags(o_flags);
-       if (new_fd < 0)
-               return new_fd;
+       FD_PREPARE(fdf, o_flags, file);
+       if (fdf.err)
+               return fdf.err;
+       get_file(file);
 
        if (ufd) {
-               error = put_user(new_fd, ufd);
-               if (error) {
-                       put_unused_fd(new_fd);
+               error = put_user(fd_prepare_fd(fdf), ufd);
+               if (error)
                        return error;
-               }
        }
 
-       fd_install(new_fd, get_file(file));
-       __receive_sock(file);
-       return new_fd;
+       __receive_sock(fd_prepare_file(fdf));
+       return fd_publish(fdf);
 }
 EXPORT_SYMBOL_GPL(receive_fd);