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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
This commit is contained in:
Linus Torvalds 2019-10-13 08:15:35 -07:00
commit b27528b027
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)