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a9886aad5d
commit3d8f874bd6upstream. The NOP op flags should have been checked from beginning like any other opcode, otherwise NOP may not be extended with the op flags. Given both liburing and Rust io-uring crate always zeros SQE op flags, just ignore users which play raw NOP uring interface without zeroing SQE, because NOP is just for test purpose. Then we can save one NOP2 opcode. Suggested-by: Jens Axboe <axboe@kernel.dk> Fixes:2b188cc1bb("Add io_uring IO interface") Cc: stable@vger.kernel.org Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20240510035031.78874-2-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
27 lines
547 B
C
27 lines
547 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/io_uring.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring.h"
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#include "nop.h"
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int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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if (READ_ONCE(sqe->rw_flags))
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return -EINVAL;
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return 0;
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}
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/*
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* IORING_OP_NOP just posts a completion event, nothing else.
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*/
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int io_nop(struct io_kiocb *req, unsigned int issue_flags)
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{
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io_req_set_res(req, 0, 0);
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return IOU_OK;
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}
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