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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>
This commit is contained in:
Pavel Begunkov 2019-10-27 18:52:20 +03:00 committed by Jens Axboe
parent c826bd7a74
commit fa45622808
1 changed files with 0 additions and 5 deletions
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5
fs/io_uring.c
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@ -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++;