io_uring: remove index from sqe_submit

submit->index is used only for inbound check in submission path (i.e.
head < ctx->sq_entries). However, it always will be true, as
1. it's already validated by io_get_sqring()
2. ctx->sq_entries can't be changedd in between, because of held
ctx->uring_lock and ctx->refs.

Signed-off-by: Pavel Begunkov <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 f83465fc1ed128625d39cb0f214d0c75dc171f18..545efd89a1f9a57e17fd987823159700d53f5726 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -271,7 +271,6 @@ struct io_ring_ctx {
 
 struct sqe_submit {
        const struct io_uring_sqe       *sqe;
-       unsigned short                  index;
        u32                             sequence;
        bool                            has_user;
        bool                            in_async;
@@ -2168,9 +2167,6 @@ static int __io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
 
        req->user_data = READ_ONCE(s->sqe->user_data);
 
-       if (unlikely(s->index >= ctx->sq_entries))
-               return -EINVAL;
-
        opcode = READ_ONCE(s->sqe->opcode);
        switch (opcode) {
        case IORING_OP_NOP:
@@ -2716,7 +2712,6 @@ static bool io_get_sqring(struct io_ring_ctx *ctx, struct sqe_submit *s)
 
        head = READ_ONCE(sq_array[head & ctx->sq_mask]);
        if (head < ctx->sq_entries) {
-               s->index = head;
                s->sqe = &ctx->sq_sqes[head];
                s->sequence = ctx->cached_sq_head;
                ctx->cached_sq_head++;