// SPDX-License-Identifier: GPL-2.0 #include #include #include #include #include #include #include #include #include #include "io_uring.h" #include "alloc_cache.h" #include "rsrc.h" #include "uring_cmd.h" static struct uring_cache *io_uring_async_get(struct io_kiocb *req) { struct io_ring_ctx *ctx = req->ctx; struct uring_cache *cache; cache = io_alloc_cache_get(&ctx->uring_cache); if (cache) { req->flags |= REQ_F_ASYNC_DATA; req->async_data = cache; return cache; } if (!io_alloc_async_data(req)) return req->async_data; return NULL; } static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags) { struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); struct uring_cache *cache = req->async_data; if (issue_flags & IO_URING_F_UNLOCKED) return; if (io_alloc_cache_put(&req->ctx->uring_cache, cache)) { ioucmd->sqe = NULL; req->async_data = NULL; req->flags &= ~REQ_F_ASYNC_DATA; } } bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx, struct task_struct *task, bool cancel_all) { struct hlist_node *tmp; struct io_kiocb *req; bool ret = false; lockdep_assert_held(&ctx->uring_lock); hlist_for_each_entry_safe(req, tmp, &ctx->cancelable_uring_cmd, hash_node) { struct io_uring_cmd *cmd = io_kiocb_to_cmd(req, struct io_uring_cmd); struct file *file = req->file; if (!cancel_all && req->task != task) continue; if (cmd->flags & IORING_URING_CMD_CANCELABLE) { /* ->sqe isn't available if no async data */ if (!req_has_async_data(req)) cmd->sqe = NULL; file->f_op->uring_cmd(cmd, IO_URING_F_CANCEL | IO_URING_F_COMPLETE_DEFER); ret = true; } } io_submit_flush_completions(ctx); return ret; } static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd, unsigned int issue_flags) { struct io_kiocb *req = cmd_to_io_kiocb(cmd); struct io_ring_ctx *ctx = req->ctx; if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) return; cmd->flags &= ~IORING_URING_CMD_CANCELABLE; io_ring_submit_lock(ctx, issue_flags); hlist_del(&req->hash_node); io_ring_submit_unlock(ctx, issue_flags); } /* * Mark this command as concelable, then io_uring_try_cancel_uring_cmd() * will try to cancel this issued command by sending ->uring_cmd() with * issue_flags of IO_URING_F_CANCEL. * * The command is guaranteed to not be done when calling ->uring_cmd() * with IO_URING_F_CANCEL, but it is driver's responsibility to deal * with race between io_uring canceling and normal completion. */ void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, unsigned int issue_flags) { struct io_kiocb *req = cmd_to_io_kiocb(cmd); struct io_ring_ctx *ctx = req->ctx; if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) { cmd->flags |= IORING_URING_CMD_CANCELABLE; io_ring_submit_lock(ctx, issue_flags); hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd); io_ring_submit_unlock(ctx, issue_flags); } } EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable); 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); /* task_work executor checks the deffered list completion */ ioucmd->task_work_cb(ioucmd, IO_URING_F_COMPLETE_DEFER); } 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); 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); io_uring_cmd_del_cancelable(ioucmd, issue_flags); 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); io_req_uring_cleanup(req, issue_flags); if (req->ctx->flags & IORING_SETUP_IOPOLL) { /* order with io_iopoll_req_issued() checking ->iopoll_complete */ smp_store_release(&req->iopoll_completed, 1); } else if (issue_flags & IO_URING_F_COMPLETE_DEFER) { if (WARN_ON_ONCE(issue_flags & IO_URING_F_UNLOCKED)) return; io_req_complete_defer(req); } else { req->io_task_work.func = io_req_task_complete; io_req_task_work_add(req); } } EXPORT_SYMBOL_GPL(io_uring_cmd_done); static int io_uring_cmd_prep_setup(struct io_kiocb *req, const struct io_uring_sqe *sqe) { struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); struct uring_cache *cache; cache = io_uring_async_get(req); if (unlikely(!cache)) return -ENOMEM; if (!(req->flags & REQ_F_FORCE_ASYNC)) { /* defer memcpy until we need it */ ioucmd->sqe = sqe; return 0; } memcpy(req->async_data, 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_MASK) 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->cmd_op = READ_ONCE(sqe->cmd_op); return io_uring_cmd_prep_setup(req, sqe); } 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->compat) issue_flags |= IO_URING_F_COMPAT; 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; } ret = file->f_op->uring_cmd(ioucmd, issue_flags); if (ret == -EAGAIN) { struct uring_cache *cache = req->async_data; if (ioucmd->sqe != (void *) cache) memcpy(cache, ioucmd->sqe, uring_sqe_size(req->ctx)); return -EAGAIN; } else if (ret == -EIOCBQUEUED) { return -EIOCBQUEUED; } if (ret < 0) req_set_fail(req); io_req_uring_cleanup(req, issue_flags); io_req_set_res(req, ret, 0); return ret; } 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); static inline int io_uring_cmd_getsockopt(struct socket *sock, struct io_uring_cmd *cmd, unsigned int issue_flags) { bool compat = !!(issue_flags & IO_URING_F_COMPAT); int optlen, optname, level, err; void __user *optval; level = READ_ONCE(cmd->sqe->level); if (level != SOL_SOCKET) return -EOPNOTSUPP; optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval)); optname = READ_ONCE(cmd->sqe->optname); optlen = READ_ONCE(cmd->sqe->optlen); err = do_sock_getsockopt(sock, compat, level, optname, USER_SOCKPTR(optval), KERNEL_SOCKPTR(&optlen)); if (err) return err; /* On success, return optlen */ return optlen; } static inline int io_uring_cmd_setsockopt(struct socket *sock, struct io_uring_cmd *cmd, unsigned int issue_flags) { bool compat = !!(issue_flags & IO_URING_F_COMPAT); int optname, optlen, level; void __user *optval; sockptr_t optval_s; optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval)); optname = READ_ONCE(cmd->sqe->optname); optlen = READ_ONCE(cmd->sqe->optlen); level = READ_ONCE(cmd->sqe->level); optval_s = USER_SOCKPTR(optval); return do_sock_setsockopt(sock, compat, level, optname, optval_s, optlen); } #if defined(CONFIG_NET) 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; case SOCKET_URING_OP_GETSOCKOPT: return io_uring_cmd_getsockopt(sock, cmd, issue_flags); case SOCKET_URING_OP_SETSOCKOPT: return io_uring_cmd_setsockopt(sock, cmd, issue_flags); default: return -EOPNOTSUPP; } } EXPORT_SYMBOL_GPL(io_uring_cmd_sock); #endif