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158 lines
4.0 KiB
158 lines
4.0 KiB
// 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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