Commit e8c2bc1f authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring: get rid of req->io/io_async_ctx union 



There's really no point in having this union, it just means that we're
always allocating enough room to cater to any command. But that's
pointless, as the ->io field is request type private anyway.

This gets rid of the io_async_ctx structure, and fills in the required
size in the io_op_defs[] instead.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 4be1c615

fs/io_uring.c

+117 −94
Original line number Diff line number Diff line
@@ -550,15 +550,6 @@ struct io_async_rw { 
	struct wait_page_queue		wpq;

};



struct io_async_ctx {

	union {

		struct io_async_rw	rw;

		struct io_async_msghdr	msg;

		struct io_async_connect	connect;

		struct io_timeout_data	timeout;

	};

};



enum {

	REQ_F_FIXED_FILE_BIT	= IOSQE_FIXED_FILE_BIT,

	REQ_F_IO_DRAIN_BIT	= IOSQE_IO_DRAIN_BIT,
@@ -662,7 +653,8 @@ struct io_kiocb { 
		struct io_completion	compl;

	};



	struct io_async_ctx		*io;

	/* opcode allocated if it needs to store data for async defer */

	void				*async_data;

	u8				opcode;

	/* polled IO has completed */

	u8				iopoll_completed;
@@ -730,8 +722,6 @@ struct io_submit_state { 
};



struct io_op_def {

	/* needs req->io allocated for deferral/async */

	unsigned		async_ctx : 1;

	/* needs current->mm setup, does mm access */

	unsigned		needs_mm : 1;

	/* needs req->file assigned */
@@ -753,27 +743,34 @@ struct io_op_def { 
	unsigned		pollout : 1;

	/* op supports buffer selection */

	unsigned		buffer_select : 1;

	/* needs rlimit(RLIMIT_FSIZE) assigned */

	unsigned		needs_fsize : 1;

	/* must always have async data allocated */

	unsigned		needs_async_data : 1;

	/* size of async data needed, if any */

	unsigned short		async_size;

};



static const struct io_op_def io_op_defs[] __read_mostly = {

	[IORING_OP_NOP] = {},

	[IORING_OP_READV] = {

		.async_ctx		= 1,

		.needs_mm		= 1,

		.needs_file		= 1,

		.unbound_nonreg_file	= 1,

		.pollin			= 1,

		.buffer_select		= 1,

		.needs_async_data	= 1,

		.async_size		= sizeof(struct io_async_rw),

	},

	[IORING_OP_WRITEV] = {

		.async_ctx		= 1,

		.needs_mm		= 1,

		.needs_file		= 1,

		.hash_reg_file		= 1,

		.unbound_nonreg_file	= 1,

		.pollout		= 1,

		.needs_fsize		= 1,

		.needs_async_data	= 1,

		.async_size		= sizeof(struct io_async_rw),

	},

	[IORING_OP_FSYNC] = {

		.needs_file		= 1,
@@ -782,6 +779,7 @@ static const struct io_op_def io_op_defs[] __read_mostly = { 
		.needs_file		= 1,

		.unbound_nonreg_file	= 1,

		.pollin			= 1,

		.async_size		= sizeof(struct io_async_rw),

	},

	[IORING_OP_WRITE_FIXED] = {

		.needs_file		= 1,
@@ -789,6 +787,7 @@ static const struct io_op_def io_op_defs[] __read_mostly = { 
		.unbound_nonreg_file	= 1,

		.pollout		= 1,

		.needs_fsize		= 1,

		.async_size		= sizeof(struct io_async_rw),

	},

	[IORING_OP_POLL_ADD] = {

		.needs_file		= 1,
@@ -799,25 +798,28 @@ static const struct io_op_def io_op_defs[] __read_mostly = { 
		.needs_file		= 1,

	},

	[IORING_OP_SENDMSG] = {

		.async_ctx		= 1,

		.needs_mm		= 1,

		.needs_file		= 1,

		.unbound_nonreg_file	= 1,

		.needs_fs		= 1,

		.pollout		= 1,

		.needs_async_data	= 1,

		.async_size		= sizeof(struct io_async_msghdr),

	},

	[IORING_OP_RECVMSG] = {

		.async_ctx		= 1,

		.needs_mm		= 1,

		.needs_file		= 1,

		.unbound_nonreg_file	= 1,

		.needs_fs		= 1,

		.pollin			= 1,

		.buffer_select		= 1,

		.needs_async_data	= 1,

		.async_size		= sizeof(struct io_async_msghdr),

	},

	[IORING_OP_TIMEOUT] = {

		.async_ctx		= 1,

		.needs_mm		= 1,

		.needs_async_data	= 1,

		.async_size		= sizeof(struct io_timeout_data),

	},

	[IORING_OP_TIMEOUT_REMOVE] = {},

	[IORING_OP_ACCEPT] = {
@@ -829,15 +831,17 @@ static const struct io_op_def io_op_defs[] __read_mostly = { 
	},

	[IORING_OP_ASYNC_CANCEL] = {},

	[IORING_OP_LINK_TIMEOUT] = {

		.async_ctx		= 1,

		.needs_mm		= 1,

		.needs_async_data	= 1,

		.async_size		= sizeof(struct io_timeout_data),

	},

	[IORING_OP_CONNECT] = {

		.async_ctx		= 1,

		.needs_mm		= 1,

		.needs_file		= 1,

		.unbound_nonreg_file	= 1,

		.pollout		= 1,

		.needs_async_data	= 1,

		.async_size		= sizeof(struct io_async_connect),

	},

	[IORING_OP_FALLOCATE] = {

		.needs_file		= 1,
@@ -867,6 +871,7 @@ static const struct io_op_def io_op_defs[] __read_mostly = { 
		.unbound_nonreg_file	= 1,

		.pollin			= 1,

		.buffer_select		= 1,

		.async_size		= sizeof(struct io_async_rw),

	},

	[IORING_OP_WRITE] = {

		.needs_mm		= 1,
@@ -874,6 +879,7 @@ static const struct io_op_def io_op_defs[] __read_mostly = { 
		.unbound_nonreg_file	= 1,

		.pollout		= 1,

		.needs_fsize		= 1,

		.async_size		= sizeof(struct io_async_rw),

	},

	[IORING_OP_FADVISE] = {

		.needs_file		= 1,
@@ -1233,9 +1239,10 @@ static void io_queue_async_work(struct io_kiocb *req) 


static void io_kill_timeout(struct io_kiocb *req)

{

	struct io_timeout_data *io = req->async_data;

	int ret;



	ret = hrtimer_try_to_cancel(&req->io->timeout.timer);

	ret = hrtimer_try_to_cancel(&io->timer);

	if (ret != -1) {

		atomic_set(&req->ctx->cq_timeouts,

			atomic_read(&req->ctx->cq_timeouts) + 1);
@@ -1623,8 +1630,8 @@ static bool io_dismantle_req(struct io_kiocb *req) 
{

	io_clean_op(req);



	if (req->io)

		kfree(req->io);

	if (req->async_data)

		kfree(req->async_data);

	if (req->file)

		io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE));
@@ -1683,10 +1690,11 @@ static void __io_free_req(struct io_kiocb *req) 


static bool io_link_cancel_timeout(struct io_kiocb *req)

{

	struct io_timeout_data *io = req->async_data;

	struct io_ring_ctx *ctx = req->ctx;

	int ret;



	ret = hrtimer_try_to_cancel(&req->io->timeout.timer);

	ret = hrtimer_try_to_cancel(&io->timer);

	if (ret != -1) {

		io_cqring_fill_event(req, -ECANCELED);

		io_commit_cqring(ctx);
@@ -2368,7 +2376,7 @@ static bool io_resubmit_prep(struct io_kiocb *req, int error) 
		goto end_req;

	}



	if (!req->io) {

	if (!req->async_data) {

		ret = io_import_iovec(rw, req, &iovec, &iter, false);

		if (ret < 0)

			goto end_req;
@@ -2649,13 +2657,14 @@ static void kiocb_done(struct kiocb *kiocb, ssize_t ret, 
		       struct io_comp_state *cs)

{

	struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);

	struct io_async_rw *io = req->async_data;



	/* add previously done IO, if any */

	if (req->io && req->io->rw.bytes_done > 0) {

	if (io && io->bytes_done > 0) {

		if (ret < 0)

			ret = req->io->rw.bytes_done;

			ret = io->bytes_done;

		else

			ret += req->io->rw.bytes_done;

			ret += io->bytes_done;

	}



	if (req->flags & REQ_F_CUR_POS)
@@ -2929,10 +2938,12 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req, 
			       struct iovec **iovec, struct iov_iter *iter,

			       bool needs_lock)

{

	if (!req->io)

	struct io_async_rw *iorw = req->async_data;



	if (!iorw)

		return __io_import_iovec(rw, req, iovec, iter, needs_lock);

	*iovec = NULL;

	return iov_iter_count(&req->io->rw.iter);

	return iov_iter_count(&iorw->iter);

}



static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb)
@@ -3001,7 +3012,7 @@ static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, 
static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec,

			  const struct iovec *fast_iov, struct iov_iter *iter)

{

	struct io_async_rw *rw = &req->io->rw;

	struct io_async_rw *rw = req->async_data;



	memcpy(&rw->iter, iter, sizeof(*iter));

	rw->free_iovec = iovec;
@@ -3025,28 +3036,29 @@ static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, 
	}

}



static inline int __io_alloc_async_ctx(struct io_kiocb *req)

static inline int __io_alloc_async_data(struct io_kiocb *req)

{

	req->io = kmalloc(sizeof(*req->io), GFP_KERNEL);

	return req->io == NULL;

	WARN_ON_ONCE(!io_op_defs[req->opcode].async_size);

	req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL);

	return req->async_data == NULL;

}



static int io_alloc_async_ctx(struct io_kiocb *req)

static int io_alloc_async_data(struct io_kiocb *req)

{

	if (!io_op_defs[req->opcode].async_ctx)

	if (!io_op_defs[req->opcode].needs_async_data)

		return 0;



	return  __io_alloc_async_ctx(req);

	return  __io_alloc_async_data(req);

}



static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,

			     const struct iovec *fast_iov,

			     struct iov_iter *iter, bool force)

{

	if (!force && !io_op_defs[req->opcode].async_ctx)

	if (!force && !io_op_defs[req->opcode].needs_async_data)

		return 0;

	if (!req->io) {

		if (__io_alloc_async_ctx(req))

	if (!req->async_data) {

		if (__io_alloc_async_data(req))

			return -ENOMEM;



		io_req_map_rw(req, iovec, fast_iov, iter);
@@ -3057,7 +3069,7 @@ static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, 
static inline int io_rw_prep_async(struct io_kiocb *req, int rw,

				   bool force_nonblock)

{

	struct io_async_rw *iorw = &req->io->rw;

	struct io_async_rw *iorw = req->async_data;

	struct iovec *iov = iorw->fast_iov;

	ssize_t ret;
@@ -3085,7 +3097,7 @@ static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, 
		return -EBADF;



	/* either don't need iovec imported or already have it */

	if (!req->io || req->flags & REQ_F_NEED_CLEANUP)

	if (!req->async_data || req->flags & REQ_F_NEED_CLEANUP)

		return 0;

	return io_rw_prep_async(req, READ, force_nonblock);

}
@@ -3148,7 +3160,8 @@ static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, 
 */

static bool io_rw_should_retry(struct io_kiocb *req)

{

	struct wait_page_queue *wait = &req->io->rw.wpq;

	struct io_async_rw *rw = req->async_data;

	struct wait_page_queue *wait = &rw->wpq;

	struct kiocb *kiocb = &req->rw.kiocb;



	/* never retry for NOWAIT, we just complete with -EAGAIN */
@@ -3192,12 +3205,13 @@ static int io_read(struct io_kiocb *req, bool force_nonblock, 
	struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;

	struct kiocb *kiocb = &req->rw.kiocb;

	struct iov_iter __iter, *iter = &__iter;

	struct io_async_rw *rw = req->async_data;

	ssize_t io_size, ret, ret2;

	size_t iov_count;

	bool no_async;



	if (req->io)

		iter = &req->io->rw.iter;

	if (rw)

		iter = &rw->iter;



	ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock);

	if (ret < 0)
@@ -3257,12 +3271,13 @@ copy_iov: 
	}

	if (no_async)

		return -EAGAIN;

	rw = req->async_data;

	/* it's copied and will be cleaned with ->io */

	iovec = NULL;

	/* now use our persistent iterator, if we aren't already */

	iter = &req->io->rw.iter;

	iter = &rw->iter;

retry:

	req->io->rw.bytes_done += ret;

	rw->bytes_done += ret;

	/* if we can retry, do so with the callbacks armed */

	if (!io_rw_should_retry(req)) {

		kiocb->ki_flags &= ~IOCB_WAITQ;
@@ -3306,7 +3321,7 @@ static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, 
		return -EBADF;



	/* either don't need iovec imported or already have it */

	if (!req->io || req->flags & REQ_F_NEED_CLEANUP)

	if (!req->async_data || req->flags & REQ_F_NEED_CLEANUP)

		return 0;

	return io_rw_prep_async(req, WRITE, force_nonblock);

}
@@ -3317,11 +3332,12 @@ static int io_write(struct io_kiocb *req, bool force_nonblock, 
	struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;

	struct kiocb *kiocb = &req->rw.kiocb;

	struct iov_iter __iter, *iter = &__iter;

	struct io_async_rw *rw = req->async_data;

	size_t iov_count;

	ssize_t ret, ret2, io_size;



	if (req->io)

		iter = &req->io->rw.iter;

	if (rw)

		iter = &rw->iter;



	ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock);

	if (ret < 0)
@@ -4098,15 +4114,18 @@ static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) 
static int io_setup_async_msg(struct io_kiocb *req,

			      struct io_async_msghdr *kmsg)

{

	if (req->io)

	struct io_async_msghdr *async_msg = req->async_data;



	if (async_msg)

		return -EAGAIN;

	if (io_alloc_async_ctx(req)) {

	if (io_alloc_async_data(req)) {

		if (kmsg->iov != kmsg->fast_iov)

			kfree(kmsg->iov);

		return -ENOMEM;

	}

	async_msg = req->async_data;

	req->flags |= REQ_F_NEED_CLEANUP;

	memcpy(&req->io->msg, kmsg, sizeof(*kmsg));

	memcpy(async_msg, kmsg, sizeof(*kmsg));

	return -EAGAIN;

}
@@ -4121,8 +4140,8 @@ static int io_sendmsg_copy_hdr(struct io_kiocb *req, 


static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)

{

	struct io_async_msghdr *async_msg = req->async_data;

	struct io_sr_msg *sr = &req->sr_msg;

	struct io_async_ctx *io = req->io;

	int ret;



	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
@@ -4137,13 +4156,13 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 
		sr->msg_flags |= MSG_CMSG_COMPAT;

#endif



	if (!io || req->opcode == IORING_OP_SEND)

	if (!async_msg || !io_op_defs[req->opcode].needs_async_data)

		return 0;

	/* iovec is already imported */

	if (req->flags & REQ_F_NEED_CLEANUP)

		return 0;



	ret = io_sendmsg_copy_hdr(req, &io->msg);

	ret = io_sendmsg_copy_hdr(req, async_msg);

	if (!ret)

		req->flags |= REQ_F_NEED_CLEANUP;

	return ret;
@@ -4161,9 +4180,9 @@ static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, 
	if (unlikely(!sock))

		return ret;



	if (req->io) {

		kmsg = &req->io->msg;

		kmsg->msg.msg_name = &req->io->msg.addr;

	if (req->async_data) {

		kmsg = req->async_data;

		kmsg->msg.msg_name = &kmsg->addr;

		/* if iov is set, it's allocated already */

		if (!kmsg->iov)

			kmsg->iov = kmsg->fast_iov;
@@ -4350,8 +4369,8 @@ static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) 
static int io_recvmsg_prep(struct io_kiocb *req,

			   const struct io_uring_sqe *sqe)

{

	struct io_async_msghdr *async_msg = req->async_data;

	struct io_sr_msg *sr = &req->sr_msg;

	struct io_async_ctx *io = req->io;

	int ret;



	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
@@ -4367,13 +4386,13 @@ static int io_recvmsg_prep(struct io_kiocb *req, 
		sr->msg_flags |= MSG_CMSG_COMPAT;

#endif



	if (!io || req->opcode == IORING_OP_RECV)

	if (!async_msg || !io_op_defs[req->opcode].needs_async_data)

		return 0;

	/* iovec is already imported */

	if (req->flags & REQ_F_NEED_CLEANUP)

		return 0;



	ret = io_recvmsg_copy_hdr(req, &io->msg);

	ret = io_recvmsg_copy_hdr(req, async_msg);

	if (!ret)

		req->flags |= REQ_F_NEED_CLEANUP;

	return ret;
@@ -4392,9 +4411,9 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, 
	if (unlikely(!sock))

		return ret;



	if (req->io) {

		kmsg = &req->io->msg;

		kmsg->msg.msg_name = &req->io->msg.addr;

	if (req->async_data) {

		kmsg = req->async_data;

		kmsg->msg.msg_name = &kmsg->addr;

		/* if iov is set, it's allocated already */

		if (!kmsg->iov)

			kmsg->iov = kmsg->fast_iov;
@@ -4536,7 +4555,7 @@ static int io_accept(struct io_kiocb *req, bool force_nonblock, 
static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)

{

	struct io_connect *conn = &req->connect;

	struct io_async_ctx *io = req->io;

	struct io_async_connect *io = req->async_data;



	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))

		return -EINVAL;
@@ -4550,22 +4569,22 @@ static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 
		return 0;



	return move_addr_to_kernel(conn->addr, conn->addr_len,

					&io->connect.address);

					&io->address);

}



static int io_connect(struct io_kiocb *req, bool force_nonblock,

		      struct io_comp_state *cs)

{

	struct io_async_ctx __io, *io;

	struct io_async_connect __io, *io;

	unsigned file_flags;

	int ret;



	if (req->io) {

		io = req->io;

	if (req->async_data) {

		io = req->async_data;

	} else {

		ret = move_addr_to_kernel(req->connect.addr,

						req->connect.addr_len,

						&__io.connect.address);

						&__io.address);

		if (ret)

			goto out;

		io = &__io;
@@ -4573,16 +4592,17 @@ static int io_connect(struct io_kiocb *req, bool force_nonblock, 


	file_flags = force_nonblock ? O_NONBLOCK : 0;



	ret = __sys_connect_file(req->file, &io->connect.address,

	ret = __sys_connect_file(req->file, &io->address,

					req->connect.addr_len, file_flags);

	if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) {

		if (req->io)

		if (req->async_data)

			return -EAGAIN;

		if (io_alloc_async_ctx(req)) {

		if (io_alloc_async_data(req)) {

			ret = -ENOMEM;

			goto out;

		}

		memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect));

		io = req->async_data;

		memcpy(req->async_data, &__io, sizeof(__io));

		return -EAGAIN;

	}

	if (ret == -ERESTARTSYS)
@@ -4724,9 +4744,9 @@ static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) 


static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req)

{

	/* pure poll stashes this in ->io, poll driven retry elsewhere */

	/* pure poll stashes this in ->async_data, poll driven retry elsewhere */

	if (req->opcode == IORING_OP_POLL_ADD)

		return (struct io_poll_iocb *) req->io;

		return req->async_data;

	return req->apoll->double_poll;

}
@@ -5169,7 +5189,7 @@ static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, 
{

	struct io_poll_table *pt = container_of(p, struct io_poll_table, pt);



	__io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->io);

	__io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data);

}



static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
@@ -5250,11 +5270,12 @@ static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) 


static int __io_timeout_cancel(struct io_kiocb *req)

{

	struct io_timeout_data *io = req->async_data;

	int ret;



	list_del_init(&req->timeout.list);



	ret = hrtimer_try_to_cancel(&req->io->timeout.timer);

	ret = hrtimer_try_to_cancel(&io->timer);

	if (ret == -1)

		return -EALREADY;
@@ -5341,10 +5362,10 @@ static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, 


	req->timeout.off = off;



	if (!req->io && io_alloc_async_ctx(req))

	if (!req->async_data && io_alloc_async_data(req))

		return -ENOMEM;



	data = &req->io->timeout;

	data = req->async_data;

	data->req = req;



	if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr)))
@@ -5362,7 +5383,7 @@ static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, 
static int io_timeout(struct io_kiocb *req)

{

	struct io_ring_ctx *ctx = req->ctx;

	struct io_timeout_data *data = &req->io->timeout;

	struct io_timeout_data *data = req->async_data;

	struct list_head *entry;

	u32 tail, off = req->timeout.off;
@@ -5533,7 +5554,7 @@ static int io_req_defer_prep(struct io_kiocb *req, 
	if (!sqe)

		return 0;



	if (io_alloc_async_ctx(req))

	if (io_alloc_async_data(req))

		return -EAGAIN;

	ret = io_prep_work_files(req);

	if (unlikely(ret))
@@ -5672,7 +5693,7 @@ static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) 
	if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list))

		return 0;



	if (!req->io) {

	if (!req->async_data) {

		ret = io_req_defer_prep(req, sqe);

		if (ret)

			return ret;
@@ -5716,8 +5737,6 @@ static void io_req_drop_files(struct io_kiocb *req) 


static void __io_clean_op(struct io_kiocb *req)

{

	struct io_async_ctx *io = req->io;



	if (req->flags & REQ_F_BUFFER_SELECTED) {

		switch (req->opcode) {

		case IORING_OP_READV:
@@ -5740,15 +5759,19 @@ static void __io_clean_op(struct io_kiocb *req) 
		case IORING_OP_READ:

		case IORING_OP_WRITEV:

		case IORING_OP_WRITE_FIXED:

		case IORING_OP_WRITE:

			if (io->rw.free_iovec)

				kfree(io->rw.free_iovec);

		case IORING_OP_WRITE: {

			struct io_async_rw *io = req->async_data;

			if (io->free_iovec)

				kfree(io->free_iovec);

			break;

			}

		case IORING_OP_RECVMSG:

		case IORING_OP_SENDMSG:

			if (io->msg.iov != io->msg.fast_iov)

				kfree(io->msg.iov);

		case IORING_OP_SENDMSG: {

			struct io_async_msghdr *io = req->async_data;

			if (io->iov != io->fast_iov)

				kfree(io->iov);

			break;

			}

		case IORING_OP_SPLICE:

		case IORING_OP_TEE:

			io_put_file(req, req->splice.file_in,
@@ -6180,7 +6203,7 @@ static void __io_queue_linked_timeout(struct io_kiocb *req) 
	 * we got a chance to setup the timer

	 */

	if (!list_empty(&req->link_list)) {

		struct io_timeout_data *data = &req->io->timeout;

		struct io_timeout_data *data = req->async_data;



		data->timer.function = io_link_timeout_fn;

		hrtimer_start(&data->timer, timespec64_to_ktime(data->ts),
@@ -6304,7 +6327,7 @@ fail_req: 
			io_req_complete(req, ret);

		}

	} else if (req->flags & REQ_F_FORCE_ASYNC) {

		if (!req->io) {

		if (!req->async_data) {

			ret = io_req_defer_prep(req, sqe);

			if (unlikely(ret))

				goto fail_req;
@@ -6509,7 +6532,7 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, 


	req->opcode = READ_ONCE(sqe->opcode);

	req->user_data = READ_ONCE(sqe->user_data);

	req->io = NULL;

	req->async_data = NULL;

	req->file = NULL;

	req->ctx = ctx;

	req->flags = 0;

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