io_uring: pass hash table into poll_find

In preparation for having multiple cancellation hash tables, pass a
table pointer into io_poll_find() and other poll cancel functions.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a31c88502463dce09254240fa037352927d7ecc3.1655371007.git.asml.silence@gmail.comReviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/poll.c

@@ -562,11 +562,12 @@ __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk,
 
 static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only,
 				     struct io_cancel_data *cd,
+				     struct io_hash_bucket hash_table[],
 				     struct io_hash_bucket **out_bucket)
 {
 	struct io_kiocb *req;
 	u32 index = hash_long(cd->data, ctx->cancel_hash_bits);
-	struct io_hash_bucket *hb = &ctx->cancel_hash[index];
+	struct io_hash_bucket *hb = &hash_table[index];
 
 	*out_bucket = NULL;
 
@@ -590,6 +591,7 @@ static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only,
 
 static struct io_kiocb *io_poll_file_find(struct io_ring_ctx *ctx,
 					  struct io_cancel_data *cd,
+					  struct io_hash_bucket hash_table[],
 					  struct io_hash_bucket **out_bucket)
 {
 	struct io_kiocb *req;
@@ -598,7 +600,7 @@ static struct io_kiocb *io_poll_file_find(struct io_ring_ctx *ctx,
 	*out_bucket = NULL;
 
 	for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
-		struct io_hash_bucket *hb = &ctx->cancel_hash[i];
+		struct io_hash_bucket *hb = &hash_table[i];
 
 		spin_lock(&hb->lock);
 		hlist_for_each_entry(req, &hb->list, hash_node) {
@@ -625,15 +627,16 @@ static bool io_poll_disarm(struct io_kiocb *req)
 	return true;
 }
 
-int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd)
+static int __io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
+			    struct io_hash_bucket hash_table[])
 {
 	struct io_hash_bucket *bucket;
 	struct io_kiocb *req;
 
 	if (cd->flags & (IORING_ASYNC_CANCEL_FD|IORING_ASYNC_CANCEL_ANY))
-		req = io_poll_file_find(ctx, cd, &bucket);
+		req = io_poll_file_find(ctx, cd, ctx->cancel_hash, &bucket);
 	else
-		req = io_poll_find(ctx, false, cd, &bucket);
+		req = io_poll_find(ctx, false, cd, ctx->cancel_hash, &bucket);
 
 	if (req)
 		io_poll_cancel_req(req);
@@ -642,6 +645,11 @@ int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd)
 	return req ? 0 : -ENOENT;
 }
 
+int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd)
+{
+	return __io_poll_cancel(ctx, cd, ctx->cancel_hash);
+}
+
 static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe,
 				     unsigned int flags)
 {
@@ -737,7 +745,7 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
 	int ret2, ret = 0;
 	bool locked;
 
-	preq = io_poll_find(ctx, true, &cd, &bucket);
+	preq = io_poll_find(ctx, true, &cd, ctx->cancel_hash, &bucket);
 	if (preq)
 		ret2 = io_poll_disarm(preq);
 	if (bucket)