switch io_msg_ring() to CLASS(fd)

Use CLASS(fd) to get the file for sync message ring requests, rather
than open-code the file retrieval dance.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20241115034902.GP3387508@ZenIV
[axboe: make a more coherent commit message]
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/msg_ring.c b/io_uring/msg_ring.c
index e63af34004b70eb59838b03a89e4fab4221e229d..333c220d322a90391ec0addb140d09db50f6f95b 100644 (file)
--- a/io_uring/msg_ring.c
+++ b/io_uring/msg_ring.c
@@ -333,7 +333,6 @@ done:
 int io_uring_sync_msg_ring(struct io_uring_sqe *sqe)
 {
        struct io_msg io_msg = { };
-       struct fd f;
        int ret;
 
        ret = __io_msg_ring_prep(&io_msg, sqe);
@@ -347,16 +346,13 @@ int io_uring_sync_msg_ring(struct io_uring_sqe *sqe)
        if (io_msg.cmd != IORING_MSG_DATA)
                return -EINVAL;
 
-       ret = -EBADF;
-       f = fdget(sqe->fd);
-       if (fd_file(f)) {
-               ret = -EBADFD;
-               if (io_is_uring_fops(fd_file(f)))
-                       ret = __io_msg_ring_data(fd_file(f)->private_data,
-                                                &io_msg, IO_URING_F_UNLOCKED);
-               fdput(f);
-       }
-       return ret;
+       CLASS(fd, f)(sqe->fd);
+       if (fd_empty(f))
+               return -EBADF;
+       if (!io_is_uring_fops(fd_file(f)))
+               return -EBADFD;
+       return  __io_msg_ring_data(fd_file(f)->private_data,
+                                  &io_msg, IO_URING_F_UNLOCKED);
 }
 
 void io_msg_cache_free(const void *entry)