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https://github.com/torvalds/linux
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deb1e496a8
Support to inject result for NOP so that we can inject failure from userspace. It is very helpful for covering failure handling code in io_uring core change. With nop flags, it becomes possible to add more test features on NOP in future. Suggested-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20240510035031.78874-3-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
44 lines
961 B
C
44 lines
961 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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struct io_nop {
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/* NOTE: kiocb has the file as the first member, so don't do it here */
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struct file *file;
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int result;
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};
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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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unsigned int flags;
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struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
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flags = READ_ONCE(sqe->nop_flags);
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if (flags & ~IORING_NOP_INJECT_RESULT)
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return -EINVAL;
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if (flags & IORING_NOP_INJECT_RESULT)
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nop->result = READ_ONCE(sqe->len);
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else
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nop->result = 0;
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return 0;
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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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struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
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if (nop->result < 0)
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req_set_fail(req);
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io_req_set_res(req, nop->result, 0);
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return IOU_OK;
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}
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