[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/cmd.h>
#include <linux/security.h>
#include <linux/nospec.h>

#include <uapi/linux/io_uring.h>

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

void io_cmd_cache_free(const void *entry)
{
	struct io_async_cmd *ac = (struct io_async_cmd *)entry;

	io_vec_free(&ac->vec);
	kfree(ac);
}

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 io_async_cmd *ac = req->async_data;
	struct io_uring_cmd_data *cache = &ac->data;

	if (cache->op_data) {
		kfree(cache->op_data);
		cache->op_data = NULL;
	}

	if (issue_flags & IO_URING_F_UNLOCKED)
		return;

	io_alloc_cache_vec_kasan(&ac->vec);
	if (ac->vec.nr > IO_VEC_CACHE_SOFT_CAP)
		io_vec_free(&ac->vec);

	if (io_alloc_cache_put(&req->ctx->cmd_cache, cache)) {
		ioucmd->sqe = NULL;
		req->async_data = NULL;
		req->flags &= ~(REQ_F_ASYNC_DATA|REQ_F_NEED_CLEANUP);
	}
}

void io_uring_cmd_cleanup(struct io_kiocb *req)
{
	io_req_uring_cleanup(req, 0);
}

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) {
			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, io_tw_token_t tw)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
	unsigned int flags = IO_URING_F_COMPLETE_DEFER;

	if (io_should_terminate_tw())
		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, u64 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 io_async_cmd *ac;

	/* see io_uring_cmd_get_async_data() */
	BUILD_BUG_ON(offsetof(struct io_async_cmd, data) != 0);

	ac = io_uring_alloc_async_data(&req->ctx->cmd_cache, req);
	if (!ac)
		return -ENOMEM;
	ac->data.op_data = NULL;

	/*
	 * Unconditionally cache the SQE for now - this is only needed for
	 * requests that go async, but prep handlers must ensure that any
	 * sqe data is stable beyond prep. Since uring_cmd is special in
	 * that it doesn't read in per-op data, play it safe and ensure that
	 * any SQE data is stable beyond prep. This can later get relaxed.
	 */
	memcpy(ac->sqes, sqe, uring_sqe_size(req->ctx));
	ioucmd->sqe = ac->sqes;
	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)
		req->buf_index = READ_ONCE(sqe->buf_index);

	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 (io_is_compat(ctx))
		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;
		if (ctx->flags & IORING_SETUP_HYBRID_IOPOLL) {
			/* make sure every req only blocks once */
			req->flags &= ~REQ_F_IOPOLL_STATE;
			req->iopoll_start = ktime_get_ns();
		}
	}

	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
	if (ret == -EAGAIN || ret == -EIOCBQUEUED)
		return ret;
	if (ret < 0)
		req_set_fail(req);
	io_req_uring_cleanup(req, issue_flags);
	io_req_set_res(req, ret, 0);
	return IOU_COMPLETE;
}

int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
			      struct iov_iter *iter,
			      struct io_uring_cmd *ioucmd,
			      unsigned int issue_flags)
{
	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);

	if (WARN_ON_ONCE(!(ioucmd->flags & IORING_URING_CMD_FIXED)))
		return -EINVAL;

	return io_import_reg_buf(req, iter, ubuf, len, rw, issue_flags);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);

int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
				  const struct iovec __user *uvec,
				  size_t uvec_segs,
				  int ddir, struct iov_iter *iter,
				  unsigned issue_flags)
{
	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	struct io_async_cmd *ac = req->async_data;
	int ret;

	if (WARN_ON_ONCE(!(ioucmd->flags & IORING_URING_CMD_FIXED)))
		return -EINVAL;

	ret = io_prep_reg_iovec(req, &ac->vec, uvec, uvec_segs);
	if (ret)
		return ret;

	return io_import_reg_vec(ddir, iter, req, &ac->vec, uvec_segs,
				 issue_flags);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed_vec);

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);
}
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>
b66509b8	5	#include <linux/io_uring/cmd.h>
2a584012	6	#include <linux/security.h>
9cda70f6	7	#include <linux/nospec.h>
99f15d8d JA	8
	9	#include <uapi/linux/io_uring.h>
	10
99f15d8d	11	#include "io_uring.h"
414d0f45	12	#include "alloc_cache.h"
a9216fac	13	#include "rsrc.h"
99f15d8d JA	14	#include "uring_cmd.h"
99f15d8d JA	15
3a4689ac PB	16	void io_cmd_cache_free(const void *entry)
	17	{
	18	struct io_async_cmd ac = (struct io_async_cmd )entry;
	19
	20	io_vec_free(&ac->vec);
	21	kfree(ac);
	22	}
	23
d10f19df JA	24	static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
	25	{
	26	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
5f14404b PB	27	struct io_async_cmd *ac = req->async_data;
5f14404b PB	28	struct io_uring_cmd_data *cache = &ac->data;
d10f19df	29
3347fa65 JA	30	if (cache->op_data) {
	31	kfree(cache->op_data);
	32	cache->op_data = NULL;
	33	}
d10f19df JA	34
	35	if (issue_flags & IO_URING_F_UNLOCKED)
	36	return;
3a4689ac PB	37
	38	io_alloc_cache_vec_kasan(&ac->vec);
	39	if (ac->vec.nr > IO_VEC_CACHE_SOFT_CAP)
	40	io_vec_free(&ac->vec);
	41
575e7b06	42	if (io_alloc_cache_put(&req->ctx->cmd_cache, cache)) {
d10f19df JA	43	ioucmd->sqe = NULL;
d10f19df JA	44	req->async_data = NULL;
3a4689ac	45	req->flags &= ~(REQ_F_ASYNC_DATA\|REQ_F_NEED_CLEANUP);
d10f19df JA	46	}
	47	}
	48
3a4689ac PB	49	void io_uring_cmd_cleanup(struct io_kiocb *req)
	50	{
	51	io_req_uring_cleanup(req, 0);
	52	}
	53
da12d9ab	54	bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx,
f03baece	55	struct io_uring_task *tctx, bool cancel_all)
da12d9ab PB	56	{
	57	struct hlist_node *tmp;
	58	struct io_kiocb *req;
	59	bool ret = false;
	60
	61	lockdep_assert_held(&ctx->uring_lock);
	62
	63	hlist_for_each_entry_safe(req, tmp, &ctx->cancelable_uring_cmd,
	64	hash_node) {
	65	struct io_uring_cmd *cmd = io_kiocb_to_cmd(req,
	66	struct io_uring_cmd);
	67	struct file *file = req->file;
	68
b6f58a3f	69	if (!cancel_all && req->tctx != tctx)
da12d9ab PB	70	continue;
	71
	72	if (cmd->flags & IORING_URING_CMD_CANCELABLE) {
e1eef2e5 PB	73	file->f_op->uring_cmd(cmd, IO_URING_F_CANCEL \|
e1eef2e5 PB	74	IO_URING_F_COMPLETE_DEFER);
da12d9ab PB	75	ret = true;
	76	}
	77	}
	78	io_submit_flush_completions(ctx);
	79	return ret;
	80	}
	81
93b8cc60 ML	82	static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd,
	83	unsigned int issue_flags)
	84	{
	85	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
	86	struct io_ring_ctx *ctx = req->ctx;
	87
	88	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE))
	89	return;
	90
	91	cmd->flags &= ~IORING_URING_CMD_CANCELABLE;
	92	io_ring_submit_lock(ctx, issue_flags);
	93	hlist_del(&req->hash_node);
	94	io_ring_submit_unlock(ctx, issue_flags);
	95	}
	96
	97	/*
	98	* Mark this command as concelable, then io_uring_try_cancel_uring_cmd()
	99	* will try to cancel this issued command by sending ->uring_cmd() with
	100	* issue_flags of IO_URING_F_CANCEL.
	101	*
	102	* The command is guaranteed to not be done when calling ->uring_cmd()
	103	* with IO_URING_F_CANCEL, but it is driver's responsibility to deal
	104	* with race between io_uring canceling and normal completion.
	105	*/
	106	void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
	107	unsigned int issue_flags)
	108	{
	109	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
	110	struct io_ring_ctx *ctx = req->ctx;
	111
	112	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) {
	113	cmd->flags \|= IORING_URING_CMD_CANCELABLE;
	114	io_ring_submit_lock(ctx, issue_flags);
	115	hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd);
	116	io_ring_submit_unlock(ctx, issue_flags);
	117	}
	118	}
	119	EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable);
	120
bcf8a029	121	static void io_uring_cmd_work(struct io_kiocb *req, io_tw_token_t tw)
99f15d8d	122	{
f2ccb5ae	123	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
df3b8ca6 PB	124	unsigned int flags = IO_URING_F_COMPLETE_DEFER;
df3b8ca6 PB	125
bab4b2cc	126	if (io_should_terminate_tw())
df3b8ca6	127	flags \|= IO_URING_F_TASK_DEAD;
e1eef2e5	128
8e5b3b89	129	/* task_work executor checks the deffered list completion */
df3b8ca6	130	ioucmd->task_work_cb(ioucmd, flags);
99f15d8d JA	131	}
99f15d8d JA	132
5f3139fc PB	133	void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
	134	void (task_work_cb)(struct io_uring_cmd , unsigned),
	135	unsigned flags)
99f15d8d JA	136	{
	137	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	138
	139	ioucmd->task_work_cb = task_work_cb;
	140	req->io_task_work.func = io_uring_cmd_work;
5f3139fc PB	141	__io_req_task_work_add(req, flags);
	142	}
	143	EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);
	144
99f15d8d JA	145	static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
	146	u64 extra1, u64 extra2)
	147	{
b24c5d75 PB	148	req->big_cqe.extra1 = extra1;
b24c5d75 PB	149	req->big_cqe.extra2 = extra2;
99f15d8d JA	150	}
	151
	152	/*
	153	* Called by consumers of io_uring_cmd, if they originally returned
	154	* -EIOCBQUEUED upon receiving the command.
	155	*/
a07d2d79	156	void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, u64 res2,
9d2789ac	157	unsigned issue_flags)
99f15d8d JA	158	{
	159	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	160
93b8cc60 ML	161	io_uring_cmd_del_cancelable(ioucmd, issue_flags);
93b8cc60 ML	162
99f15d8d JA	163	if (ret < 0)
	164	req_set_fail(req);
	165
ff2557b7	166	io_req_set_res(req, ret, 0);
99f15d8d JA	167	if (req->ctx->flags & IORING_SETUP_CQE32)
99f15d8d JA	168	io_req_set_cqe32_extra(req, res2, 0);
d10f19df	169	io_req_uring_cleanup(req, issue_flags);
27a67079	170	if (req->ctx->flags & IORING_SETUP_IOPOLL) {
5756a3a7 KJ	171	/* order with io_iopoll_req_issued() checking ->iopoll_complete */
5756a3a7 KJ	172	smp_store_release(&req->iopoll_completed, 1);
e1eef2e5 PB	173	} else if (issue_flags & IO_URING_F_COMPLETE_DEFER) {
	174	if (WARN_ON_ONCE(issue_flags & IO_URING_F_UNLOCKED))
	175	return;
6edd953b	176	io_req_complete_defer(req);
27a67079	177	} else {
6edd953b PB	178	req->io_task_work.func = io_req_task_complete;
6edd953b PB	179	io_req_task_work_add(req);
27a67079	180	}
99f15d8d JA	181	}
	182	EXPORT_SYMBOL_GPL(io_uring_cmd_done);
	183
d10f19df JA	184	static int io_uring_cmd_prep_setup(struct io_kiocb *req,
d10f19df JA	185	const struct io_uring_sqe *sqe)
99f15d8d	186	{
f2ccb5ae	187	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
5f14404b	188	struct io_async_cmd *ac;
99f15d8d	189
5f14404b PB	190	/* see io_uring_cmd_get_async_data() */
	191	BUILD_BUG_ON(offsetof(struct io_async_cmd, data) != 0);
	192
	193	ac = io_uring_alloc_async_data(&req->ctx->cmd_cache, req);
	194	if (!ac)
5eff57fa	195	return -ENOMEM;
5f14404b	196	ac->data.op_data = NULL;
5eff57fa	197
d6211ebb JA	198	/*
	199	* Unconditionally cache the SQE for now - this is only needed for
	200	* requests that go async, but prep handlers must ensure that any
	201	* sqe data is stable beyond prep. Since uring_cmd is special in
	202	* that it doesn't read in per-op data, play it safe and ensure that
	203	* any SQE data is stable beyond prep. This can later get relaxed.
	204	*/
296e1696 PB	205	memcpy(ac->sqes, sqe, uring_sqe_size(req->ctx));
296e1696 PB	206	ioucmd->sqe = ac->sqes;
5eff57fa	207	return 0;
99f15d8d JA	208	}
	209
	210	int io_uring_cmd_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	211	{
f2ccb5ae	212	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d	213
9cda70f6	214	if (sqe->__pad1)
99f15d8d	215	return -EINVAL;
9cda70f6 AG	216
9cda70f6 AG	217	ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
528ce678	218	if (ioucmd->flags & ~IORING_URING_CMD_MASK)
9cda70f6 AG	219	return -EINVAL;
9cda70f6 AG	220
5d309914 PB	221	if (ioucmd->flags & IORING_URING_CMD_FIXED)
	222	req->buf_index = READ_ONCE(sqe->buf_index);
	223
99f15d8d	224	ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
d10f19df JA	225
d10f19df JA	226	return io_uring_cmd_prep_setup(req, sqe);
99f15d8d JA	227	}
	228
	229	int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
	230	{
f2ccb5ae	231	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	232	struct io_ring_ctx *ctx = req->ctx;
	233	struct file *file = req->file;
	234	int ret;
	235
03b3d6be	236	if (!file->f_op->uring_cmd)
99f15d8d JA	237	return -EOPNOTSUPP;
99f15d8d JA	238
2a584012 LC	239	ret = security_uring_cmd(ioucmd);
	240	if (ret)
	241	return ret;
	242
99f15d8d JA	243	if (ctx->flags & IORING_SETUP_SQE128)
	244	issue_flags \|= IO_URING_F_SQE128;
	245	if (ctx->flags & IORING_SETUP_CQE32)
	246	issue_flags \|= IO_URING_F_CQE32;
0bba6fcc	247	if (io_is_compat(ctx))
5fea44a6	248	issue_flags \|= IO_URING_F_COMPAT;
5756a3a7	249	if (ctx->flags & IORING_SETUP_IOPOLL) {
03b3d6be JA	250	if (!file->f_op->uring_cmd_iopoll)
03b3d6be JA	251	return -EOPNOTSUPP;
99f15d8d	252	issue_flags \|= IO_URING_F_IOPOLL;
5756a3a7	253	req->iopoll_completed = 0;
63166b81	254	if (ctx->flags & IORING_SETUP_HYBRID_IOPOLL) {
	255	/* make sure every req only blocks once */
	256	req->flags &= ~REQ_F_IOPOLL_STATE;
	257	req->iopoll_start = ktime_get_ns();
	258	}
5756a3a7	259	}
99f15d8d	260
99f15d8d	261	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
d6211ebb JA	262	if (ret == -EAGAIN \|\| ret == -EIOCBQUEUED)
d6211ebb JA	263	return ret;
d10f19df JA	264	if (ret < 0)
	265	req_set_fail(req);
	266	io_req_uring_cleanup(req, issue_flags);
	267	io_req_set_res(req, ret, 0);
8bb9d6cc	268	return IOU_COMPLETE;
99f15d8d	269	}
a9216fac AG	270
a9216fac AG	271	int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
0c542a69 CSM	272	struct iov_iter *iter,
0c542a69 CSM	273	struct io_uring_cmd *ioucmd,
69d483d5	274	unsigned int issue_flags)
a9216fac AG	275	{
	276	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	277
6faaf6e0 PB	278	if (WARN_ON_ONCE(!(ioucmd->flags & IORING_URING_CMD_FIXED)))
	279	return -EINVAL;
	280
5d309914	281	return io_import_reg_buf(req, iter, ubuf, len, rw, issue_flags);
a9216fac AG	282	}
a9216fac AG	283	EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
8e9fad0e	284
ef490275 PB	285	int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
	286	const struct iovec __user *uvec,
	287	size_t uvec_segs,
	288	int ddir, struct iov_iter *iter,
	289	unsigned issue_flags)
	290	{
	291	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	292	struct io_async_cmd *ac = req->async_data;
	293	int ret;
	294
6faaf6e0 PB	295	if (WARN_ON_ONCE(!(ioucmd->flags & IORING_URING_CMD_FIXED)))
	296	return -EINVAL;
	297
ef490275 PB	298	ret = io_prep_reg_iovec(req, &ac->vec, uvec, uvec_segs);
	299	if (ret)
	300	return ret;
	301
	302	return io_import_reg_vec(ddir, iter, req, &ac->vec, uvec_segs,
	303	issue_flags);
	304	}
	305	EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed_vec);
	306
6746ee4c PB	307	void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
	308	{
	309	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	310
	311	io_req_queue_iowq(req);
	312	}