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Commit b27528b0 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'for-linus-20191012' of git://git.kernel.dk/linux-block 

Pull io_uring fix from Jens Axboe:
 "Single small fix for a regression in the sequence logic for linked
  commands"

* tag 'for-linus-20191012' of git://git.kernel.dk/linux-block:
  io_uring: fix sequence logic for timeout requests
parents da940012 7adf4eaf

fs/io_uring.c

+20 −17
Original line number Diff line number Diff line
@@ -415,27 +415,27 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) 
	return ctx;

}



static inline bool __io_sequence_defer(struct io_ring_ctx *ctx,

				       struct io_kiocb *req)

{

	return req->sequence != ctx->cached_cq_tail + ctx->rings->sq_dropped;

}



static inline bool io_sequence_defer(struct io_ring_ctx *ctx,

				     struct io_kiocb *req)

{

	/* timeout requests always honor sequence */

	if (!(req->flags & REQ_F_TIMEOUT) &&

	    (req->flags & (REQ_F_IO_DRAIN|REQ_F_IO_DRAINED)) != REQ_F_IO_DRAIN)

	if ((req->flags & (REQ_F_IO_DRAIN|REQ_F_IO_DRAINED)) != REQ_F_IO_DRAIN)

		return false;



	return req->sequence != ctx->cached_cq_tail + ctx->rings->sq_dropped;

	return __io_sequence_defer(ctx, req);

}



static struct io_kiocb *__io_get_deferred_req(struct io_ring_ctx *ctx,

					      struct list_head *list)

static struct io_kiocb *io_get_deferred_req(struct io_ring_ctx *ctx)

{

	struct io_kiocb *req;



	if (list_empty(list))

		return NULL;



	req = list_first_entry(list, struct io_kiocb, list);

	if (!io_sequence_defer(ctx, req)) {

	req = list_first_entry_or_null(&ctx->defer_list, struct io_kiocb, list);

	if (req && !io_sequence_defer(ctx, req)) {

		list_del_init(&req->list);

		return req;

	}
@@ -443,14 +443,17 @@ static struct io_kiocb *__io_get_deferred_req(struct io_ring_ctx *ctx, 
	return NULL;

}



static struct io_kiocb *io_get_deferred_req(struct io_ring_ctx *ctx)

static struct io_kiocb *io_get_timeout_req(struct io_ring_ctx *ctx)

{

	return __io_get_deferred_req(ctx, &ctx->defer_list);

	struct io_kiocb *req;



	req = list_first_entry_or_null(&ctx->timeout_list, struct io_kiocb, list);

	if (req && !__io_sequence_defer(ctx, req)) {

		list_del_init(&req->list);

		return req;

	}



static struct io_kiocb *io_get_timeout_req(struct io_ring_ctx *ctx)

{

	return __io_get_deferred_req(ctx, &ctx->timeout_list);

	return NULL;

}



static void __io_commit_cqring(struct io_ring_ctx *ctx)