Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 193 insertions, 0 deletions

diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
new file mode 100644
index 000000000..5fa19861c
--- /dev/null
+++ b/io_uring/uring_cmd.c
@@ -0,0 +1,193 @@
+// 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 <asm/ioctls.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->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);
+
+	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);
+
+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;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+EXPORT_SYMBOL_GPL(io_uring_cmd_sock);