[linux-2.6-block.git] / io_uring / uring_cmd.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/io_uring.h>

#include <uapi/linux/io_uring.h>

#include "io_uring.h"
#include "uring_cmd.h"

static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);

	ioucmd->task_work_cb(ioucmd);
}

void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
			void (*task_work_cb)(struct io_uring_cmd *))
{
	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);

	ioucmd->task_work_cb = task_work_cb;
	req->io_task_work.func = io_uring_cmd_work;
	io_req_task_work_add(req);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);

static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
					  u64 extra1, u64 extra2)
{
	req->extra1 = extra1;
	req->extra2 = extra2;
	req->flags |= REQ_F_CQE32_INIT;
}

/*
 * Called by consumers of io_uring_cmd, if they originally returned
 * -EIOCBQUEUED upon receiving the command.
 */
void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
{
	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);

	if (ret < 0)
		req_set_fail(req);

	io_req_set_res(req, ret, 0);
	if (req->ctx->flags & IORING_SETUP_CQE32)
		io_req_set_cqe32_extra(req, res2, 0);
	__io_req_complete(req, 0);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_done);

int io_uring_cmd_prep_async(struct io_kiocb *req)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
	size_t cmd_size;

	BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
	BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);

	cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);

	memcpy(req->async_data, ioucmd->cmd, cmd_size);
	return 0;
}

int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);

	if (sqe->rw_flags || sqe->__pad1)
		return -EINVAL;
	ioucmd->cmd = sqe->cmd;
	ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
	return 0;
}

int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
	struct io_ring_ctx *ctx = req->ctx;
	struct file *file = req->file;
	int ret;

	if (!req->file->f_op->uring_cmd)
		return -EOPNOTSUPP;

	if (ctx->flags & IORING_SETUP_SQE128)
		issue_flags |= IO_URING_F_SQE128;
	if (ctx->flags & IORING_SETUP_CQE32)
		issue_flags |= IO_URING_F_CQE32;
	if (ctx->flags & IORING_SETUP_IOPOLL)
		issue_flags |= IO_URING_F_IOPOLL;

	if (req_has_async_data(req))
		ioucmd->cmd = req->async_data;

	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
	if (ret == -EAGAIN) {
		if (!req_has_async_data(req)) {
			if (io_alloc_async_data(req))
				return -ENOMEM;
			io_uring_cmd_prep_async(req);
		}
		return -EAGAIN;
	}

	if (ret != -EIOCBQUEUED) {
		if (ret < 0)
			req_set_fail(req);
		io_req_set_res(req, ret, 0);
		return IOU_OK;
	}

	return IOU_ISSUE_SKIP_COMPLETE;
}
Commit	Line	Data
99f15d8d JA	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/kernel.h>
	3	#include <linux/errno.h>
	4	#include <linux/file.h>
	5	#include <linux/io_uring.h>
	6
	7	#include <uapi/linux/io_uring.h>
	8
99f15d8d JA	9	#include "io_uring.h"
	10	#include "uring_cmd.h"
	11
	12	static void io_uring_cmd_work(struct io_kiocb req, bool locked)
	13	{
f2ccb5ae	14	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	15
	16	ioucmd->task_work_cb(ioucmd);
	17	}
	18
	19	void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
	20	void (task_work_cb)(struct io_uring_cmd ))
	21	{
	22	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	23
	24	ioucmd->task_work_cb = task_work_cb;
	25	req->io_task_work.func = io_uring_cmd_work;
	26	io_req_task_work_add(req);
	27	}
	28	EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
	29
	30	static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
	31	u64 extra1, u64 extra2)
	32	{
	33	req->extra1 = extra1;
	34	req->extra2 = extra2;
	35	req->flags \|= REQ_F_CQE32_INIT;
	36	}
	37
	38	/*
	39	* Called by consumers of io_uring_cmd, if they originally returned
	40	* -EIOCBQUEUED upon receiving the command.
	41	*/
	42	void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
	43	{
	44	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	45
	46	if (ret < 0)
	47	req_set_fail(req);
	48
ff2557b7	49	io_req_set_res(req, ret, 0);
99f15d8d JA	50	if (req->ctx->flags & IORING_SETUP_CQE32)
	51	io_req_set_cqe32_extra(req, res2, 0);
	52	__io_req_complete(req, 0);
	53	}
	54	EXPORT_SYMBOL_GPL(io_uring_cmd_done);
	55
	56	int io_uring_cmd_prep_async(struct io_kiocb *req)
	57	{
f2ccb5ae	58	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	59	size_t cmd_size;
99f15d8d JA	60
9c71d39a SM	61	BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
	62	BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
	63
99f15d8d JA	64	cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
	65
	66	memcpy(req->async_data, ioucmd->cmd, cmd_size);
	67	return 0;
	68	}
	69
	70	int io_uring_cmd_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	71	{
f2ccb5ae	72	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	73
	74	if (sqe->rw_flags \|\| sqe->__pad1)
	75	return -EINVAL;
	76	ioucmd->cmd = sqe->cmd;
	77	ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
	78	return 0;
	79	}
	80
	81	int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
	82	{
f2ccb5ae	83	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	84	struct io_ring_ctx *ctx = req->ctx;
	85	struct file *file = req->file;
	86	int ret;
	87
	88	if (!req->file->f_op->uring_cmd)
	89	return -EOPNOTSUPP;
	90
	91	if (ctx->flags & IORING_SETUP_SQE128)
	92	issue_flags \|= IO_URING_F_SQE128;
	93	if (ctx->flags & IORING_SETUP_CQE32)
	94	issue_flags \|= IO_URING_F_CQE32;
	95	if (ctx->flags & IORING_SETUP_IOPOLL)
	96	issue_flags \|= IO_URING_F_IOPOLL;
	97
	98	if (req_has_async_data(req))
	99	ioucmd->cmd = req->async_data;
	100
	101	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
	102	if (ret == -EAGAIN) {
	103	if (!req_has_async_data(req)) {
	104	if (io_alloc_async_data(req))
	105	return -ENOMEM;
	106	io_uring_cmd_prep_async(req);
	107	}
	108	return -EAGAIN;
	109	}
	110
	111	if (ret != -EIOCBQUEUED) {
3ed159c9 AG	112	if (ret < 0)
	113	req_set_fail(req);
	114	io_req_set_res(req, ret, 0);
99f15d8d JA	115	return IOU_OK;
	116	}
	117
	118	return IOU_ISSUE_SKIP_COMPLETE;
	119	}