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io_uring: refactor io_read for unsupported nowait

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!io_file_supports_async() case of io_read() is hard to read, it jumps
somewhere in the middle of the function just to do async setup and fail
on a similar check. Call io_setup_async_rw() directly for this case,
it's much easier to follow.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-02-04 13:51:59 +00:00 committed by Jens Axboe
parent eeb60b9ab4
commit 6713e7a614
1 changed files with 6 additions and 6 deletions
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12
fs/io_uring.c
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@ -3506,7 +3506,6 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
struct iov_iter __iter, *iter = &__iter;
struct io_async_rw *rw = req->async_data;
ssize_t io_size, ret, ret2;
bool no_async;
if (rw) {
iter = &rw->iter;
@ -3527,9 +3526,12 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
kiocb->ki_flags |= IOCB_NOWAIT;
/* If the file doesn't support async, just async punt */
no_async = force_nonblock && !io_file_supports_async(req->file, READ);
if (no_async)
goto copy_iov;
if (force_nonblock && !io_file_supports_async(req->file, READ)) {
ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
if (!ret)
return -EAGAIN;
goto out_free;
}
ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size);
if (unlikely(ret))
@ -3568,8 +3570,6 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
ret = ret2;
goto out_free;
}
if (no_async)
return -EAGAIN;
rw = req->async_data;
/* it's copied and will be cleaned with ->io */
iovec = NULL;