2022-05-25 11:59:19 +00:00
|
|
|
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/errno.h>
|
|
|
|
#include <linux/file.h>
|
|
|
|
#include <linux/io_uring.h>
|
2022-07-15 19:16:22 +00:00
|
|
|
#include <linux/security.h>
|
2022-09-30 06:27:39 +00:00
|
|
|
#include <linux/nospec.h>
|
2022-05-25 11:59:19 +00:00
|
|
|
|
|
|
|
#include <uapi/linux/io_uring.h>
|
|
|
|
|
|
|
|
#include "io_uring.h"
|
2022-09-30 06:27:38 +00:00
|
|
|
#include "rsrc.h"
|
2022-05-25 11:59:19 +00:00
|
|
|
#include "uring_cmd.h"
|
|
|
|
|
|
|
|
static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
|
|
|
|
{
|
2022-08-11 07:11:15 +00:00
|
|
|
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
|
2022-05-25 11:59:19 +00:00
|
|
|
|
|
|
|
ioucmd->task_work_cb(ioucmd);
|
|
|
|
}
|
|
|
|
|
|
|
|
void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
|
|
|
|
void (*task_work_cb)(struct io_uring_cmd *))
|
|
|
|
{
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
|
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
|
|
|
struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
|
|
|
|
|
|
|
|
if (ret < 0)
|
|
|
|
req_set_fail(req);
|
|
|
|
|
2022-08-03 12:07:57 +00:00
|
|
|
io_req_set_res(req, ret, 0);
|
2022-05-25 11:59:19 +00:00
|
|
|
if (req->ctx->flags & IORING_SETUP_CQE32)
|
|
|
|
io_req_set_cqe32_extra(req, res2, 0);
|
2022-08-23 16:14:41 +00:00
|
|
|
if (req->ctx->flags & IORING_SETUP_IOPOLL)
|
|
|
|
/* order with io_iopoll_req_issued() checking ->iopoll_complete */
|
|
|
|
smp_store_release(&req->iopoll_completed, 1);
|
|
|
|
else
|
2022-11-23 11:33:41 +00:00
|
|
|
io_req_complete_post(req, 0);
|
2022-05-25 11:59:19 +00:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(io_uring_cmd_done);
|
|
|
|
|
|
|
|
int io_uring_cmd_prep_async(struct io_kiocb *req)
|
|
|
|
{
|
2022-08-11 07:11:15 +00:00
|
|
|
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
|
2022-05-25 11:59:19 +00:00
|
|
|
size_t cmd_size;
|
|
|
|
|
2022-08-11 07:11:16 +00:00
|
|
|
BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
|
|
|
|
BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
|
|
|
|
|
2022-05-25 11:59:19 +00:00
|
|
|
cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
|
|
|
|
|
|
|
|
memcpy(req->async_data, ioucmd->cmd, cmd_size);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
|
|
{
|
2022-08-11 07:11:15 +00:00
|
|
|
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
|
2022-05-25 11:59:19 +00:00
|
|
|
|
2022-09-30 06:27:39 +00:00
|
|
|
if (sqe->__pad1)
|
2022-05-25 11:59:19 +00:00
|
|
|
return -EINVAL;
|
2022-09-30 06:27:39 +00:00
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
2022-05-25 11:59:19 +00:00
|
|
|
ioucmd->cmd = sqe->cmd;
|
|
|
|
ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
|
|
|
|
{
|
2022-08-11 07:11:15 +00:00
|
|
|
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
|
2022-05-25 11:59:19 +00:00
|
|
|
struct io_ring_ctx *ctx = req->ctx;
|
|
|
|
struct file *file = req->file;
|
|
|
|
int ret;
|
|
|
|
|
2023-03-08 16:26:13 +00:00
|
|
|
if (!file->f_op->uring_cmd)
|
2022-05-25 11:59:19 +00:00
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
2022-07-15 19:16:22 +00:00
|
|
|
ret = security_uring_cmd(ioucmd);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
2022-05-25 11:59:19 +00:00
|
|
|
if (ctx->flags & IORING_SETUP_SQE128)
|
|
|
|
issue_flags |= IO_URING_F_SQE128;
|
|
|
|
if (ctx->flags & IORING_SETUP_CQE32)
|
|
|
|
issue_flags |= IO_URING_F_CQE32;
|
2022-08-23 16:14:41 +00:00
|
|
|
if (ctx->flags & IORING_SETUP_IOPOLL) {
|
2023-03-08 16:26:13 +00:00
|
|
|
if (!file->f_op->uring_cmd_iopoll)
|
|
|
|
return -EOPNOTSUPP;
|
2022-05-25 11:59:19 +00:00
|
|
|
issue_flags |= IO_URING_F_IOPOLL;
|
2022-08-23 16:14:41 +00:00
|
|
|
req->iopoll_completed = 0;
|
|
|
|
WRITE_ONCE(ioucmd->cookie, NULL);
|
|
|
|
}
|
2022-05-25 11:59:19 +00:00
|
|
|
|
|
|
|
if (req_has_async_data(req))
|
|
|
|
ioucmd->cmd = req->async_data;
|
|
|
|
|
|
|
|
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) {
|
2022-08-11 09:14:59 +00:00
|
|
|
if (ret < 0)
|
|
|
|
req_set_fail(req);
|
|
|
|
io_req_set_res(req, ret, 0);
|
2022-08-23 15:10:22 +00:00
|
|
|
return ret;
|
2022-05-25 11:59:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return IOU_ISSUE_SKIP_COMPLETE;
|
|
|
|
}
|
2022-09-30 06:27:38 +00:00
|
|
|
|
|
|
|
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);
|