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io_uring: fix error handling in io_queue_link_head

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In case of an error io_submit_sqe() drops a request and continues
without it, even if the request was a part of a link. Not only it
doesn't cancel links, but also may execute wrong sequence of actions.

Stop consuming sqes, and let the user handle errors.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2019-12-05 16:15:45 +03:00 committed by Jens Axboe
parent 78076bb64a
commit 2e6e1fde32
1 changed files with 7 additions and 5 deletions
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12
fs/io_uring.c
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@ -3315,7 +3315,7 @@ static inline void io_queue_link_head(struct io_kiocb *req)
#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK)
static void io_submit_sqe(struct io_kiocb *req, struct io_submit_state *state,
static bool io_submit_sqe(struct io_kiocb *req, struct io_submit_state *state,
struct io_kiocb **link)
{
struct io_ring_ctx *ctx = req->ctx;
@ -3334,7 +3334,7 @@ static void io_submit_sqe(struct io_kiocb *req, struct io_submit_state *state,
err_req:
io_cqring_add_event(req, ret);
io_double_put_req(req);
return;
return false;
}
/*
@ -3373,6 +3373,8 @@ static void io_submit_sqe(struct io_kiocb *req, struct io_submit_state *state,
} else {
io_queue_sqe(req);
}
return true;
}
/*
@ -3502,6 +3504,7 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
}
}
submitted++;
sqe_flags = req->sqe->flags;
req->ring_file = ring_file;
@ -3511,9 +3514,8 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
req->needs_fixed_file = async;
trace_io_uring_submit_sqe(ctx, req->sqe->user_data,
true, async);
io_submit_sqe(req, statep, &link);
submitted++;
if (!io_submit_sqe(req, statep, &link))
break;
/*
* If previous wasn't linked and we have a linked command,
* that's the end of the chain. Submit the previous link.