159 lines
4.0 KiB
C
159 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/io_uring.h>
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#include <linux/security.h>
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#include <linux/nospec.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring.h"
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#include "rsrc.h"
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#include "uring_cmd.h"
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static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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ioucmd->task_work_cb(ioucmd);
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}
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void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *))
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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ioucmd->task_work_cb = task_work_cb;
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req->io_task_work.func = io_uring_cmd_work;
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io_req_task_work_add(req);
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
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static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
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u64 extra1, u64 extra2)
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{
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req->extra1 = extra1;
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req->extra2 = extra2;
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req->flags |= REQ_F_CQE32_INIT;
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}
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/*
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* Called by consumers of io_uring_cmd, if they originally returned
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* -EIOCBQUEUED upon receiving the command.
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*/
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void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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if (ret < 0)
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req_set_fail(req);
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io_req_set_res(req, ret, 0);
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if (req->ctx->flags & IORING_SETUP_CQE32)
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io_req_set_cqe32_extra(req, res2, 0);
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if (req->ctx->flags & IORING_SETUP_IOPOLL)
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/* order with io_iopoll_req_issued() checking ->iopoll_complete */
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smp_store_release(&req->iopoll_completed, 1);
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else
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__io_req_complete(req, 0);
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_done);
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int io_uring_cmd_prep_async(struct io_kiocb *req)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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size_t cmd_size;
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BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
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BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
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cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
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memcpy(req->async_data, ioucmd->cmd, cmd_size);
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return 0;
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}
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int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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if (sqe->__pad1)
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return -EINVAL;
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ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
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if (ioucmd->flags & ~IORING_URING_CMD_FIXED)
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return -EINVAL;
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if (ioucmd->flags & IORING_URING_CMD_FIXED) {
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struct io_ring_ctx *ctx = req->ctx;
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u16 index;
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req->buf_index = READ_ONCE(sqe->buf_index);
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if (unlikely(req->buf_index >= ctx->nr_user_bufs))
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return -EFAULT;
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index = array_index_nospec(req->buf_index, ctx->nr_user_bufs);
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req->imu = ctx->user_bufs[index];
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io_req_set_rsrc_node(req, ctx, 0);
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}
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ioucmd->cmd = sqe->cmd;
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ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
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return 0;
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}
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int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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struct io_ring_ctx *ctx = req->ctx;
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struct file *file = req->file;
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int ret;
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if (!req->file->f_op->uring_cmd)
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return -EOPNOTSUPP;
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ret = security_uring_cmd(ioucmd);
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if (ret)
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return ret;
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if (ctx->flags & IORING_SETUP_SQE128)
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issue_flags |= IO_URING_F_SQE128;
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if (ctx->flags & IORING_SETUP_CQE32)
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issue_flags |= IO_URING_F_CQE32;
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if (ctx->flags & IORING_SETUP_IOPOLL) {
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issue_flags |= IO_URING_F_IOPOLL;
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req->iopoll_completed = 0;
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WRITE_ONCE(ioucmd->cookie, NULL);
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}
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if (req_has_async_data(req))
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ioucmd->cmd = req->async_data;
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ret = file->f_op->uring_cmd(ioucmd, issue_flags);
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if (ret == -EAGAIN) {
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if (!req_has_async_data(req)) {
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if (io_alloc_async_data(req))
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return -ENOMEM;
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io_uring_cmd_prep_async(req);
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}
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return -EAGAIN;
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}
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if (ret != -EIOCBQUEUED) {
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if (ret < 0)
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req_set_fail(req);
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io_req_set_res(req, ret, 0);
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return ret;
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}
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return IOU_ISSUE_SKIP_COMPLETE;
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}
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int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
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struct iov_iter *iter, void *ioucmd)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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return io_import_fixed(rw, iter, req->imu, ubuf, len);
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
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