io_uring: add more build check for uapi

Add a couple of BUILD_BUG_ON() checking some rsrc uapi structs and SQE
flags.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ff960df4d5026b9fb5bfd80994b9d3667d3926da.1619536280.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2872f1d..aa5854c 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -10134,6 +10134,13 @@ static int __init io_uring_init(void)
        BUILD_BUG_SQE_ELEM(42, __u16,  personality);
        BUILD_BUG_SQE_ELEM(44, __s32,  splice_fd_in);
 
+       BUILD_BUG_ON(sizeof(struct io_uring_files_update) !=
+                    sizeof(struct io_uring_rsrc_update));
+       BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) >
+                    sizeof(struct io_uring_rsrc_update2));
+       /* should fit into one byte */
+       BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8));
+
        BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST);
        BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int));
        req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC |