[linux-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 <linux/security.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;

	ret = security_uring_cmd(ioucmd);
	if (ret)
		return ret;

	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 ret;
	}

	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>
2a584012	6	#include <linux/security.h>
99f15d8d JA	7
	8	#include <uapi/linux/io_uring.h>
	9
99f15d8d JA	10	#include "io_uring.h"
	11	#include "uring_cmd.h"
	12
	13	static void io_uring_cmd_work(struct io_kiocb req, bool locked)
	14	{
f2ccb5ae	15	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	16
	17	ioucmd->task_work_cb(ioucmd);
	18	}
	19
	20	void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
	21	void (task_work_cb)(struct io_uring_cmd ))
	22	{
	23	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	24
	25	ioucmd->task_work_cb = task_work_cb;
	26	req->io_task_work.func = io_uring_cmd_work;
	27	io_req_task_work_add(req);
	28	}
	29	EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
	30
	31	static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
	32	u64 extra1, u64 extra2)
	33	{
	34	req->extra1 = extra1;
	35	req->extra2 = extra2;
	36	req->flags \|= REQ_F_CQE32_INIT;
	37	}
	38
	39	/*
	40	* Called by consumers of io_uring_cmd, if they originally returned
	41	* -EIOCBQUEUED upon receiving the command.
	42	*/
	43	void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
	44	{
	45	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	46
	47	if (ret < 0)
	48	req_set_fail(req);
	49
ff2557b7	50	io_req_set_res(req, ret, 0);
99f15d8d JA	51	if (req->ctx->flags & IORING_SETUP_CQE32)
	52	io_req_set_cqe32_extra(req, res2, 0);
	53	__io_req_complete(req, 0);
	54	}
	55	EXPORT_SYMBOL_GPL(io_uring_cmd_done);
	56
	57	int io_uring_cmd_prep_async(struct io_kiocb *req)
	58	{
f2ccb5ae	59	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	60	size_t cmd_size;
99f15d8d JA	61
9c71d39a SM	62	BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
	63	BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
	64
99f15d8d JA	65	cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
	66
	67	memcpy(req->async_data, ioucmd->cmd, cmd_size);
	68	return 0;
	69	}
	70
	71	int io_uring_cmd_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	72	{
f2ccb5ae	73	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	74
	75	if (sqe->rw_flags \|\| sqe->__pad1)
	76	return -EINVAL;
	77	ioucmd->cmd = sqe->cmd;
	78	ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
	79	return 0;
	80	}
	81
	82	int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
	83	{
f2ccb5ae	84	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	85	struct io_ring_ctx *ctx = req->ctx;
	86	struct file *file = req->file;
	87	int ret;
	88
	89	if (!req->file->f_op->uring_cmd)
	90	return -EOPNOTSUPP;
	91
2a584012 LC	92	ret = security_uring_cmd(ioucmd);
	93	if (ret)
	94	return ret;
	95
99f15d8d JA	96	if (ctx->flags & IORING_SETUP_SQE128)
	97	issue_flags \|= IO_URING_F_SQE128;
	98	if (ctx->flags & IORING_SETUP_CQE32)
	99	issue_flags \|= IO_URING_F_CQE32;
	100	if (ctx->flags & IORING_SETUP_IOPOLL)
	101	issue_flags \|= IO_URING_F_IOPOLL;
	102
	103	if (req_has_async_data(req))
	104	ioucmd->cmd = req->async_data;
	105
	106	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
	107	if (ret == -EAGAIN) {
	108	if (!req_has_async_data(req)) {
	109	if (io_alloc_async_data(req))
	110	return -ENOMEM;
	111	io_uring_cmd_prep_async(req);
	112	}
	113	return -EAGAIN;
	114	}
	115
	116	if (ret != -EIOCBQUEUED) {
3ed159c9 AG	117	if (ret < 0)
	118	req_set_fail(req);
	119	io_req_set_res(req, ret, 0);
a9c3eda7	120	return ret;
99f15d8d JA	121	}
	122
	123	return IOU_ISSUE_SKIP_COMPLETE;
	124	}