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io_uring: alloc ->io in io_req_defer_prep() 

Every call to io_req_defer_prep() is prepended with allocating ->io,
just do that in the function. And while we're at it, mark error paths
with unlikey and replace "if (ret < 0)" with "if (ret)".

There is only one change in the observable behaviour, that's instead of
killing the head request right away on error, it postpones it until the
link is assembled, that looks more preferable.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-07-15 12:46:51 +03:00 committed by Jens Axboe
parent 1c2da9e883
commit 327d6d968b
1 changed files with 7 additions and 15 deletions
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22
fs/io_uring.c
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@ -5279,6 +5279,9 @@ static int io_req_defer_prep(struct io_kiocb *req,
if (!sqe)
return 0;
if (io_alloc_async_ctx(req))
return -EAGAIN;
if (io_op_defs[req->opcode].file_table) {
io_req_init_async(req);
ret = io_grab_files(req);
@ -5418,10 +5421,8 @@ static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return 0;
if (!req->io) {
if (io_alloc_async_ctx(req))
return -EAGAIN;
ret = io_req_defer_prep(req, sqe);
if (ret < 0)
if (ret)
return ret;
}
io_prep_async_link(req);
@ -6024,11 +6025,8 @@ fail_req:
}
} else if (req->flags & REQ_F_FORCE_ASYNC) {
if (!req->io) {
ret = -EAGAIN;
if (io_alloc_async_ctx(req))
goto fail_req;
ret = io_req_defer_prep(req, sqe);
if (unlikely(ret < 0))
if (unlikely(ret))
goto fail_req;
}
@ -6081,11 +6079,8 @@ static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
head->flags |= REQ_F_IO_DRAIN;
ctx->drain_next = 1;
}
if (io_alloc_async_ctx(req))
return -EAGAIN;
ret = io_req_defer_prep(req, sqe);
if (ret) {
if (unlikely(ret)) {
/* fail even hard links since we don't submit */
head->flags |= REQ_F_FAIL_LINK;
return ret;
@ -6108,11 +6103,8 @@ static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
req->flags |= REQ_F_LINK_HEAD;
INIT_LIST_HEAD(&req->link_list);
if (io_alloc_async_ctx(req))
return -EAGAIN;
ret = io_req_defer_prep(req, sqe);
if (ret)
if (unlikely(ret))
req->flags |= REQ_F_FAIL_LINK;
*link = req;
} else {