From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44A74C433EF for ; Mon, 18 Apr 2022 16:44:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346362AbiDRQqu (ORCPT ); Mon, 18 Apr 2022 12:46:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46870 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346360AbiDRQqt (ORCPT ); Mon, 18 Apr 2022 12:46:49 -0400 Received: from mail-il1-x135.google.com (mail-il1-x135.google.com [IPv6:2607:f8b0:4864:20::135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34F1232987 for ; Mon, 18 Apr 2022 09:44:09 -0700 (PDT) Received: by mail-il1-x135.google.com with SMTP id r17so2857384iln.9 for ; Mon, 18 Apr 2022 09:44:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=72qqfoeUnn7bx4nXRMz+lGIKuQcntyP/cU4vs+RzVYQ=; b=lCruSLUKdy2uuvpqzEilSdkuJDBpL2okrbdzHVCGEEO8xF4aG5veEQhgdseDIfqu2r vXcQLm2kmJRwYXyebMnmlOU5E2nooNayR0qTY7u98ACRZwHhxhKJxa4olPx7RJmudzhV W6uClDrSvKNnlafqxuin2eT8Uqva4Du0WzQDikaNWOOMdqzecQKqikAzDVL2EDMm2ZdL eC7SQGNqxfK0f34q+ILJpewN9tuiBkpKUtyD/43Y7S7PNNkahE2gpp5dm8arRO/XmIKA ozAVXLOKLw0mFRjJbEcndixUCayxET7y9Z0KiueU2mNB7tL99aWLrYfCDPWIbodQ4n41 0giw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=72qqfoeUnn7bx4nXRMz+lGIKuQcntyP/cU4vs+RzVYQ=; b=tvYzlmgonI3TtzbIAiEgJetDr3dIdPF6Vt6wZ0hyHUNW93AcE818dV19U0tTyA6ARg MplZPyp3b9Jl/2CDPw0m0Eh2F0IGcgrXfpkYsaPEYAxRzieBPjA4hNcoTXg7Qa39X0+u AcQ9NzPVwKgJBAlMvHuOf7mPJiPXU5ZutnWXDo6wu8J5Psqtv4dffphqC4IDfCvo6CYF Gbt08XP/oV29+WjIo/skm4dwNxBRTbcy82ONjLiGWpgRBFXOD8eHVbbbtjmq17LFI936 f6ObsSa+3OWQMs3bJETwDqE/JQ4/SB67TmZ6moZ+k7ISPKY2J3KcukRNsVZdoyU87YxL 78fQ== X-Gm-Message-State: AOAM532wW77iaC+N3F4mO9JJbV2Vm9YDDrsi74y9H5rSxmys8wEpYb6r 3sA6RYl5DZaqElC9/BuA0nTA77v/JsKGcQ== X-Google-Smtp-Source: ABdhPJyxbKNT6t25puEwyXdcOTNzKcGS8u9rwd3v7h7oaD0T6BnsM/1BINatesr2o5rsLHrptaDsEA== X-Received: by 2002:a05:6e02:188c:b0:2cb:febf:48f8 with SMTP id o12-20020a056e02188c00b002cbfebf48f8mr5067495ilu.223.1650300249083; Mon, 18 Apr 2022 09:44:09 -0700 (PDT) Received: from m1.localdomain ([207.135.234.126]) by smtp.gmail.com with ESMTPSA id y19-20020a056e020f5300b002cc33e5997dsm1188926ilj.63.2022.04.18.09.44.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Apr 2022 09:44:08 -0700 (PDT) From: Jens Axboe To: io-uring@vger.kernel.org Cc: Jens Axboe Subject: [PATCH 4/5] io_uring: allow IORING_OP_ASYNC_CANCEL with 'fd' key Date: Mon, 18 Apr 2022 10:44:01 -0600 Message-Id: <20220418164402.75259-5-axboe@kernel.dk> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220418164402.75259-1-axboe@kernel.dk> References: <20220418164402.75259-1-axboe@kernel.dk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Currently sqe->addr must contain the user_data of the request being canceled. Introduce the IORING_ASYNC_CANCEL_FD flag, which tells the kernel that we're keying off the file fd instead for cancelation. This allows canceling any request that a) uses a file, and b) was assigned the file based on the value being passed in. Signed-off-by: Jens Axboe --- fs/io_uring.c | 72 ++++++++++++++++++++++++++++++----- include/uapi/linux/io_uring.h | 3 ++ 2 files changed, 66 insertions(+), 9 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index c6c00c22940a..70050c94560e 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -570,6 +570,7 @@ struct io_cancel { struct file *file; u64 addr; u32 flags; + s32 fd; }; struct io_timeout { @@ -975,7 +976,10 @@ struct io_defer_entry { struct io_cancel_data { struct io_ring_ctx *ctx; - u64 data; + union { + u64 data; + struct file *file; + }; u32 flags; int seq; }; @@ -6288,6 +6292,29 @@ static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only, return NULL; } +static struct io_kiocb *io_poll_file_find(struct io_ring_ctx *ctx, + struct io_cancel_data *cd) + __must_hold(&ctx->completion_lock) +{ + struct io_kiocb *req; + int i; + + for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { + struct hlist_head *list; + + list = &ctx->cancel_hash[i]; + hlist_for_each_entry(req, list, hash_node) { + if (req->file != cd->file) + continue; + if (cd->seq == req->work.cancel_seq) + continue; + req->work.cancel_seq = cd->seq; + return req; + } + } + return NULL; +} + static bool io_poll_disarm(struct io_kiocb *req) __must_hold(&ctx->completion_lock) { @@ -6301,8 +6328,12 @@ static bool io_poll_disarm(struct io_kiocb *req) static int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd) __must_hold(&ctx->completion_lock) { - struct io_kiocb *req = io_poll_find(ctx, false, cd); + struct io_kiocb *req; + if (cd->flags & IORING_ASYNC_CANCEL_FD) + req = io_poll_file_find(ctx, cd); + else + req = io_poll_find(ctx, false, cd); if (!req) return -ENOENT; io_poll_cancel_req(req); @@ -6751,8 +6782,13 @@ static bool io_cancel_cb(struct io_wq_work *work, void *data) if (req->ctx != cd->ctx) return false; - if (req->cqe.user_data != cd->data) - return false; + if (cd->flags & IORING_ASYNC_CANCEL_FD) { + if (req->file != cd->file) + return false; + } else { + if (req->cqe.user_data != cd->data) + return false; + } if (cd->flags & IORING_ASYNC_CANCEL_ALL) { if (cd->seq == req->work.cancel_seq) return false; @@ -6807,9 +6843,11 @@ static int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd) if (ret != -ENOENT) goto out; - spin_lock_irq(&ctx->timeout_lock); - ret = io_timeout_cancel(ctx, cd); - spin_unlock_irq(&ctx->timeout_lock); + if (!(cd->flags & IORING_ASYNC_CANCEL_FD)) { + spin_lock_irq(&ctx->timeout_lock); + ret = io_timeout_cancel(ctx, cd); + spin_unlock_irq(&ctx->timeout_lock); + } out: spin_unlock(&ctx->completion_lock); return ret; @@ -6820,15 +6858,17 @@ static int io_async_cancel_prep(struct io_kiocb *req, { if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) return -EINVAL; - if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) + if (unlikely(req->flags & REQ_F_BUFFER_SELECT)) return -EINVAL; if (sqe->ioprio || sqe->off || sqe->len || sqe->splice_fd_in) return -EINVAL; req->cancel.addr = READ_ONCE(sqe->addr); req->cancel.flags = READ_ONCE(sqe->cancel_flags); - if (req->cancel.flags & ~IORING_ASYNC_CANCEL_ALL) + if (req->cancel.flags & ~(IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_FD)) return -EINVAL; + if (req->cancel.flags & IORING_ASYNC_CANCEL_FD) + req->cancel.fd = READ_ONCE(sqe->fd); return 0; } @@ -6877,7 +6917,21 @@ static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) }; int ret; + if (cd.flags & IORING_ASYNC_CANCEL_FD) { + if (req->flags & REQ_F_FIXED_FILE) + req->file = io_file_get_fixed(req, req->cancel.fd, + issue_flags); + else + req->file = io_file_get_normal(req, req->cancel.fd); + if (!req->file) { + ret = -EBADF; + goto done; + } + cd.file = req->file; + } + ret = __io_async_cancel(&cd, req, issue_flags); +done: if (ret < 0) req_set_fail(req); io_req_complete_post(req, ret, 0); diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 476e58a2837f..cc7fe82a1798 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -191,8 +191,11 @@ enum { * ASYNC_CANCEL flags. * * IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key + * IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the + * request 'user_data' */ #define IORING_ASYNC_CANCEL_ALL (1U << 0) +#define IORING_ASYNC_CANCEL_FD (1U << 1) /* * IO completion data structure (Completion Queue Entry) -- 2.35.1