// 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 <linux/nospec.h> #include <uapi/linux/io_uring.h> #include "io_uring.h"#include "rsrc.h"#include "uring_cmd.h" static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts){	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);	unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED; 	ioucmd->task_work_cb(ioucmd, issue_flags);} void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,			void (*task_work_cb)(struct io_uring_cmd *, unsigned),			unsigned flags){	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, flags);}EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task); void io_uring_cmd_do_in_task_lazy(struct io_uring_cmd *ioucmd,			void (*task_work_cb)(struct io_uring_cmd *, unsigned)){	__io_uring_cmd_do_in_task(ioucmd, task_work_cb, IOU_F_TWQ_LAZY_WAKE);}EXPORT_SYMBOL_GPL(io_uring_cmd_do_in_task_lazy); 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,		       unsigned issue_flags){	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);	if (req->ctx->flags & IORING_SETUP_IOPOLL) {		/* order with io_iopoll_req_issued() checking ->iopoll_complete */		smp_store_release(&req->iopoll_completed, 1);	} else {		struct io_tw_state ts = {			.locked = !(issue_flags & IO_URING_F_UNLOCKED),		};		io_req_task_complete(req, &ts);	}}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); 	memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx));	ioucmd->sqe = req->async_data;	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->__pad1)		return -EINVAL; 	ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);	if (ioucmd->flags & ~IORING_URING_CMD_FIXED)		return -EINVAL; 	if (ioucmd->flags & IORING_URING_CMD_FIXED) {		struct io_ring_ctx *ctx = req->ctx;		u16 index; 		req->buf_index = READ_ONCE(sqe->buf_index);		if (unlikely(req->buf_index >= ctx->nr_user_bufs))			return -EFAULT;		index = array_index_nospec(req->buf_index, ctx->nr_user_bufs);		req->imu = ctx->user_bufs[index];		io_req_set_rsrc_node(req, ctx, 0);	}	ioucmd->sqe = sqe;	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 (!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) {		if (!file->f_op->uring_cmd_iopoll)			return -EOPNOTSUPP;		issue_flags |= IO_URING_F_IOPOLL;		req->iopoll_completed = 0;		WRITE_ONCE(ioucmd->cookie, NULL);	} 	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;} int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,			      struct iov_iter *iter, void *ioucmd){	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); 	return io_import_fixed(rw, iter, req->imu, ubuf, len);}EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);