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io_uring: fix sequence logic for timeout requests 

We have two ways a request can be deferred:

1) It's a regular request that depends on another one
2) It's a timeout that tracks completions

We have a shared helper to determine whether to defer, and that
attempts to make the right decision based on the request. But we
only have some of this information in the caller. Un-share the
two timeout/defer helpers so the caller can use the right one.

Fixes: 5262f56798 ("io_uring: IORING_OP_TIMEOUT support")
Reported-by: yangerkun <yangerkun@huawei.com>
Reviewed-by: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
alistair/sunxi64-5.4-dsi
Jens Axboe 2019-10-10 21:42:58 -06:00
parent 862488105b
commit 7adf4eaf60
1 changed files with 23 additions and 20 deletions
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43
fs/io_uring.c
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@ -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)
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)
return false;
return req->sequence != ctx->cached_cq_tail + ctx->rings->sq_dropped;
}
static struct io_kiocb *__io_get_deferred_req(struct io_ring_ctx *ctx,
struct list_head *list)
static inline bool io_sequence_defer(struct io_ring_ctx *ctx,
struct io_kiocb *req)
{
if ((req->flags & (REQ_F_IO_DRAIN|REQ_F_IO_DRAINED)) != REQ_F_IO_DRAIN)
return false;
return __io_sequence_defer(ctx, req);
}
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)
{
return __io_get_deferred_req(ctx, &ctx->defer_list);
}
static struct io_kiocb *io_get_timeout_req(struct io_ring_ctx *ctx)
{
return __io_get_deferred_req(ctx, &ctx->timeout_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;
}
return NULL;
}
static void __io_commit_cqring(struct io_ring_ctx *ctx)