io_uring/uring_cmd.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/file.h>
 #include <linux/io_uring/cmd.h>
 #include <linux/io_uring/net.h>
 #include <linux/security.h>
 #include <linux/nospec.h>
 #include <net/sock.h>

 #include <uapi/linux/io_uring.h>
 #include <asm/ioctls.h>

 #include "io_uring.h"
 #include "alloc_cache.h"
 #include "rsrc.h"
 #include "uring_cmd.h"

 static struct uring_cache *io_uring_async_get(struct io_kiocb *req)
 {
 	struct io_ring_ctx *ctx = req->ctx;
 	struct uring_cache *cache;

 	cache = io_alloc_cache_get(&ctx->uring_cache);
 	if (cache) {
 		req->flags |= REQ_F_ASYNC_DATA;
 		req->async_data = cache;
 		return cache;
 	}
 	if (!io_alloc_async_data(req))
 		return req->async_data;
 	return NULL;
 }

 static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
 	struct uring_cache *cache = req->async_data;

 	if (issue_flags & IO_URING_F_UNLOCKED)
 		return;
 	if (io_alloc_cache_put(&req->ctx->uring_cache, cache)) {
 		ioucmd->sqe = NULL;
 		req->async_data = NULL;
 		req->flags &= ~REQ_F_ASYNC_DATA;
 	}
 }

 bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx,
 				   struct io_uring_task *tctx, bool cancel_all)
 {
 	struct hlist_node *tmp;
 	struct io_kiocb *req;
 	bool ret = false;

 	lockdep_assert_held(&ctx->uring_lock);

 	hlist_for_each_entry_safe(req, tmp, &ctx->cancelable_uring_cmd,
 			hash_node) {
 		struct io_uring_cmd *cmd = io_kiocb_to_cmd(req,
 				struct io_uring_cmd);
 		struct file *file = req->file;

 		if (!cancel_all && req->tctx != tctx)
 			continue;

 		if (cmd->flags & IORING_URING_CMD_CANCELABLE) {
 			/* ->sqe isn't available if no async data */
 			if (!req_has_async_data(req))
 				cmd->sqe = NULL;
 			file->f_op->uring_cmd(cmd, IO_URING_F_CANCEL |
 						   IO_URING_F_COMPLETE_DEFER);
 			ret = true;
 		}
 	}
 	io_submit_flush_completions(ctx);
 	return ret;
 }

 static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd,
 		unsigned int issue_flags)
 {
 	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
 	struct io_ring_ctx *ctx = req->ctx;

 	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE))
 		return;

 	cmd->flags &= ~IORING_URING_CMD_CANCELABLE;
 	io_ring_submit_lock(ctx, issue_flags);
 	hlist_del(&req->hash_node);
 	io_ring_submit_unlock(ctx, issue_flags);
 }

 /*
  * Mark this command as concelable, then io_uring_try_cancel_uring_cmd()
  * will try to cancel this issued command by sending ->uring_cmd() with
  * issue_flags of IO_URING_F_CANCEL.
  *
  * The command is guaranteed to not be done when calling ->uring_cmd()
  * with IO_URING_F_CANCEL, but it is driver's responsibility to deal
  * with race between io_uring canceling and normal completion.
  */
 void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
 		unsigned int issue_flags)
 {
 	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
 	struct io_ring_ctx *ctx = req->ctx;

 	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) {
 		cmd->flags |= IORING_URING_CMD_CANCELABLE;
 		io_ring_submit_lock(ctx, issue_flags);
 		hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd);
 		io_ring_submit_unlock(ctx, issue_flags);
 	}
 }
 EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable);

 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 int flags = IO_URING_F_COMPLETE_DEFER;

 	if (current->flags & (PF_EXITING | PF_KTHREAD))
 		flags |= IO_URING_F_TASK_DEAD;

 	/* task_work executor checks the deffered list completion */
 	ioucmd->task_work_cb(ioucmd, 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);

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

 /*
  * 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);

 	io_uring_cmd_del_cancelable(ioucmd, issue_flags);

 	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_uring_cleanup(req, issue_flags);
 	if (req->ctx->flags & IORING_SETUP_IOPOLL) {
 		/* order with io_iopoll_req_issued() checking ->iopoll_complete */
 		smp_store_release(&req->iopoll_completed, 1);
 	} else if (issue_flags & IO_URING_F_COMPLETE_DEFER) {
 		if (WARN_ON_ONCE(issue_flags & IO_URING_F_UNLOCKED))
 			return;
 		io_req_complete_defer(req);
 	} else {
 		req->io_task_work.func = io_req_task_complete;
 		io_req_task_work_add(req);
 	}
 }
 EXPORT_SYMBOL_GPL(io_uring_cmd_done);

 static int io_uring_cmd_prep_setup(struct io_kiocb *req,
 				   const struct io_uring_sqe *sqe)
 {
 	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
 	struct uring_cache *cache;

 	cache = io_uring_async_get(req);
 	if (unlikely(!cache))
 		return -ENOMEM;

 	if (!(req->flags & REQ_F_FORCE_ASYNC)) {
 		/* defer memcpy until we need it */
 		ioucmd->sqe = sqe;
 		return 0;
 	}

 	memcpy(req->async_data, 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_MASK)
 		return -EINVAL;

 	if (ioucmd->flags & IORING_URING_CMD_FIXED) {
 		struct io_ring_ctx *ctx = req->ctx;
 		struct io_rsrc_node *node;
 		u16 index = READ_ONCE(sqe->buf_index);

 		node = io_rsrc_node_lookup(&ctx->buf_table, index);
 		if (unlikely(!node))
 			return -EFAULT;
 		/*
 		 * Pi node upfront, prior to io_uring_cmd_import_fixed()
 		 * being called. This prevents destruction of the mapped buffer
 		 * we'll need at actual import time.
 		 */
 		io_req_assign_buf_node(req, node);
 	}
 	ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);

 	return io_uring_cmd_prep_setup(req, sqe);
 }

 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->compat)
 		issue_flags |= IO_URING_F_COMPAT;
 	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;
 	}

 	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
 	if (ret == -EAGAIN) {
 		struct uring_cache *cache = req->async_data;

 		if (ioucmd->sqe != (void *) cache)
 			memcpy(cache, ioucmd->sqe, uring_sqe_size(req->ctx));
 		return -EAGAIN;
 	} else if (ret == -EIOCBQUEUED) {
 		return -EIOCBQUEUED;
 	}

 	if (ret < 0)
 		req_set_fail(req);
 	io_req_uring_cleanup(req, issue_flags);
 	io_req_set_res(req, ret, 0);
 	return IOU_OK;
 }

 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);
 	struct io_rsrc_node *node = req->buf_node;

 	/* Must have had rsrc_node assigned at prep time */
 	if (node)
 		return io_import_fixed(rw, iter, node->buf, ubuf, len);

 	return -EFAULT;
 }
 EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);

 void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
 {
 	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);

 	io_req_queue_iowq(req);
 }

 static inline int io_uring_cmd_getsockopt(struct socket *sock,
 					  struct io_uring_cmd *cmd,
 					  unsigned int issue_flags)
 {
 	bool compat = !!(issue_flags & IO_URING_F_COMPAT);
 	int optlen, optname, level, err;
 	void __user *optval;

 	level = READ_ONCE(cmd->sqe->level);
 	if (level != SOL_SOCKET)
 		return -EOPNOTSUPP;

 	optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
 	optname = READ_ONCE(cmd->sqe->optname);
 	optlen = READ_ONCE(cmd->sqe->optlen);

 	err = do_sock_getsockopt(sock, compat, level, optname,
 				 USER_SOCKPTR(optval),
 				 KERNEL_SOCKPTR(&optlen));
 	if (err)
 		return err;

 	/* On success, return optlen */
 	return optlen;
 }

 static inline int io_uring_cmd_setsockopt(struct socket *sock,
 					  struct io_uring_cmd *cmd,
 					  unsigned int issue_flags)
 {
 	bool compat = !!(issue_flags & IO_URING_F_COMPAT);
 	int optname, optlen, level;
 	void __user *optval;
 	sockptr_t optval_s;

 	optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
 	optname = READ_ONCE(cmd->sqe->optname);
 	optlen = READ_ONCE(cmd->sqe->optlen);
 	level = READ_ONCE(cmd->sqe->level);
 	optval_s = USER_SOCKPTR(optval);

 	return do_sock_setsockopt(sock, compat, level, optname, optval_s,
 				  optlen);
 }

 #if defined(CONFIG_NET)
 int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
 {
 	struct socket *sock = cmd->file->private_data;
 	struct sock *sk = sock->sk;
 	struct proto *prot = READ_ONCE(sk->sk_prot);
 	int ret, arg = 0;

 	if (!prot || !prot->ioctl)
 		return -EOPNOTSUPP;

 	switch (cmd->sqe->cmd_op) {
 	case SOCKET_URING_OP_SIOCINQ:
 		ret = prot->ioctl(sk, SIOCINQ, &arg);
 		if (ret)
 			return ret;
 		return arg;
 	case SOCKET_URING_OP_SIOCOUTQ:
 		ret = prot->ioctl(sk, SIOCOUTQ, &arg);
 		if (ret)
 			return ret;
 		return arg;
 	case SOCKET_URING_OP_GETSOCKOPT:
 		return io_uring_cmd_getsockopt(sock, cmd, issue_flags);
 	case SOCKET_URING_OP_SETSOCKOPT:
 		return io_uring_cmd_setsockopt(sock, cmd, issue_flags);
 	default:
 		return -EOPNOTSUPP;
 	}
 }
 EXPORT_SYMBOL_GPL(io_uring_cmd_sock);
 #endif
	// SPDX-License-Identifier: GPL-2.0
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/file.h>
	#include <linux/io_uring/cmd.h>
	#include <linux/io_uring/net.h>
	#include <linux/security.h>
	#include <linux/nospec.h>
	#include <net/sock.h>

	#include <uapi/linux/io_uring.h>
	#include <asm/ioctls.h>

	#include "io_uring.h"
	#include "alloc_cache.h"
	#include "rsrc.h"
	#include "uring_cmd.h"

	static struct uring_cache io_uring_async_get(struct io_kiocb req)
	{
	struct io_ring_ctx *ctx = req->ctx;
	struct uring_cache *cache;

	cache = io_alloc_cache_get(&ctx->uring_cache);
	if (cache) {
	req->flags \|= REQ_F_ASYNC_DATA;
	req->async_data = cache;
	return cache;
	}
	if (!io_alloc_async_data(req))
	return req->async_data;
	return NULL;
	}

	static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
	{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
	struct uring_cache *cache = req->async_data;

	if (issue_flags & IO_URING_F_UNLOCKED)
	return;
	if (io_alloc_cache_put(&req->ctx->uring_cache, cache)) {
	ioucmd->sqe = NULL;
	req->async_data = NULL;
	req->flags &= ~REQ_F_ASYNC_DATA;
	}
	}

	bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx,
	struct io_uring_task *tctx, bool cancel_all)
	{
	struct hlist_node *tmp;
	struct io_kiocb *req;
	bool ret = false;

	lockdep_assert_held(&ctx->uring_lock);

	hlist_for_each_entry_safe(req, tmp, &ctx->cancelable_uring_cmd,
	hash_node) {
	struct io_uring_cmd *cmd = io_kiocb_to_cmd(req,
	struct io_uring_cmd);
	struct file *file = req->file;

	if (!cancel_all && req->tctx != tctx)
	continue;

	if (cmd->flags & IORING_URING_CMD_CANCELABLE) {
	/* ->sqe isn't available if no async data */
	if (!req_has_async_data(req))
	cmd->sqe = NULL;
	file->f_op->uring_cmd(cmd, IO_URING_F_CANCEL \|
	IO_URING_F_COMPLETE_DEFER);
	ret = true;
	}
	}
	io_submit_flush_completions(ctx);
	return ret;
	}

	static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd,
	unsigned int issue_flags)
	{
	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
	struct io_ring_ctx *ctx = req->ctx;

	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE))
	return;

	cmd->flags &= ~IORING_URING_CMD_CANCELABLE;
	io_ring_submit_lock(ctx, issue_flags);
	hlist_del(&req->hash_node);
	io_ring_submit_unlock(ctx, issue_flags);
	}

	/*
	* Mark this command as concelable, then io_uring_try_cancel_uring_cmd()
	* will try to cancel this issued command by sending ->uring_cmd() with
	* issue_flags of IO_URING_F_CANCEL.
	*
	* The command is guaranteed to not be done when calling ->uring_cmd()
	* with IO_URING_F_CANCEL, but it is driver's responsibility to deal
	* with race between io_uring canceling and normal completion.
	*/
	void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
	unsigned int issue_flags)
	{
	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
	struct io_ring_ctx *ctx = req->ctx;

	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) {
	cmd->flags \|= IORING_URING_CMD_CANCELABLE;
	io_ring_submit_lock(ctx, issue_flags);
	hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd);
	io_ring_submit_unlock(ctx, issue_flags);
	}
	}
	EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable);

	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 int flags = IO_URING_F_COMPLETE_DEFER;

	if (current->flags & (PF_EXITING \| PF_KTHREAD))
	flags \|= IO_URING_F_TASK_DEAD;

	/* task_work executor checks the deffered list completion */
	ioucmd->task_work_cb(ioucmd, 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);

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

	/*
	* 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);

	io_uring_cmd_del_cancelable(ioucmd, issue_flags);

	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_uring_cleanup(req, issue_flags);
	if (req->ctx->flags & IORING_SETUP_IOPOLL) {
	/* order with io_iopoll_req_issued() checking ->iopoll_complete */
	smp_store_release(&req->iopoll_completed, 1);
	} else if (issue_flags & IO_URING_F_COMPLETE_DEFER) {
	if (WARN_ON_ONCE(issue_flags & IO_URING_F_UNLOCKED))
	return;
	io_req_complete_defer(req);
	} else {
	req->io_task_work.func = io_req_task_complete;
	io_req_task_work_add(req);
	}
	}
	EXPORT_SYMBOL_GPL(io_uring_cmd_done);

	static int io_uring_cmd_prep_setup(struct io_kiocb *req,
	const struct io_uring_sqe *sqe)
	{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
	struct uring_cache *cache;

	cache = io_uring_async_get(req);
	if (unlikely(!cache))
	return -ENOMEM;

	if (!(req->flags & REQ_F_FORCE_ASYNC)) {
	/* defer memcpy until we need it */
	ioucmd->sqe = sqe;
	return 0;
	}

	memcpy(req->async_data, 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_MASK)
	return -EINVAL;

	if (ioucmd->flags & IORING_URING_CMD_FIXED) {
	struct io_ring_ctx *ctx = req->ctx;
	struct io_rsrc_node *node;
	u16 index = READ_ONCE(sqe->buf_index);

	node = io_rsrc_node_lookup(&ctx->buf_table, index);
	if (unlikely(!node))
	return -EFAULT;
	/*
	* Pi node upfront, prior to io_uring_cmd_import_fixed()
	* being called. This prevents destruction of the mapped buffer
	* we'll need at actual import time.
	*/
	io_req_assign_buf_node(req, node);
	}
	ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);

	return io_uring_cmd_prep_setup(req, sqe);
	}

	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->compat)
	issue_flags \|= IO_URING_F_COMPAT;
	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;
	}

	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
	if (ret == -EAGAIN) {
	struct uring_cache *cache = req->async_data;

	if (ioucmd->sqe != (void *) cache)
	memcpy(cache, ioucmd->sqe, uring_sqe_size(req->ctx));
	return -EAGAIN;
	} else if (ret == -EIOCBQUEUED) {
	return -EIOCBQUEUED;
	}

	if (ret < 0)
	req_set_fail(req);
	io_req_uring_cleanup(req, issue_flags);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
	}

	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);
	struct io_rsrc_node *node = req->buf_node;

	/* Must have had rsrc_node assigned at prep time */
	if (node)
	return io_import_fixed(rw, iter, node->buf, ubuf, len);

	return -EFAULT;
	}
	EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);

	void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
	{
	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);

	io_req_queue_iowq(req);
	}

	static inline int io_uring_cmd_getsockopt(struct socket *sock,
	struct io_uring_cmd *cmd,
	unsigned int issue_flags)
	{
	bool compat = !!(issue_flags & IO_URING_F_COMPAT);
	int optlen, optname, level, err;
	void __user *optval;

	level = READ_ONCE(cmd->sqe->level);
	if (level != SOL_SOCKET)
	return -EOPNOTSUPP;

	optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
	optname = READ_ONCE(cmd->sqe->optname);
	optlen = READ_ONCE(cmd->sqe->optlen);

	err = do_sock_getsockopt(sock, compat, level, optname,
	USER_SOCKPTR(optval),
	KERNEL_SOCKPTR(&optlen));
	if (err)
	return err;

	/* On success, return optlen */
	return optlen;
	}

	static inline int io_uring_cmd_setsockopt(struct socket *sock,
	struct io_uring_cmd *cmd,
	unsigned int issue_flags)
	{
	bool compat = !!(issue_flags & IO_URING_F_COMPAT);
	int optname, optlen, level;
	void __user *optval;
	sockptr_t optval_s;

	optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
	optname = READ_ONCE(cmd->sqe->optname);
	optlen = READ_ONCE(cmd->sqe->optlen);
	level = READ_ONCE(cmd->sqe->level);
	optval_s = USER_SOCKPTR(optval);

	return do_sock_setsockopt(sock, compat, level, optname, optval_s,
	optlen);
	}

	#if defined(CONFIG_NET)
	int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
	{
	struct socket *sock = cmd->file->private_data;
	struct sock *sk = sock->sk;
	struct proto *prot = READ_ONCE(sk->sk_prot);
	int ret, arg = 0;

	if (!prot \|\| !prot->ioctl)
	return -EOPNOTSUPP;

	switch (cmd->sqe->cmd_op) {
	case SOCKET_URING_OP_SIOCINQ:
	ret = prot->ioctl(sk, SIOCINQ, &arg);
	if (ret)
	return ret;
	return arg;
	case SOCKET_URING_OP_SIOCOUTQ:
	ret = prot->ioctl(sk, SIOCOUTQ, &arg);
	if (ret)
	return ret;
	return arg;
	case SOCKET_URING_OP_GETSOCKOPT:
	return io_uring_cmd_getsockopt(sock, cmd, issue_flags);
	case SOCKET_URING_OP_SETSOCKOPT:
	return io_uring_cmd_setsockopt(sock, cmd, issue_flags);
	default:
	return -EOPNOTSUPP;
	}
	}
	EXPORT_SYMBOL_GPL(io_uring_cmd_sock);
	#endif