From patchwork Thu Feb 4 23:28:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kalesh Singh X-Patchwork-Id: 12068961 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10946C433DB for ; Thu, 4 Feb 2021 23:31:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB51964F51 for ; Thu, 4 Feb 2021 23:31:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230270AbhBDXbD (ORCPT ); Thu, 4 Feb 2021 18:31:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58090 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230091AbhBDXax (ORCPT ); Thu, 4 Feb 2021 18:30:53 -0500 Received: from mail-qt1-x849.google.com (mail-qt1-x849.google.com [IPv6:2607:f8b0:4864:20::849]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A6F5C0617A7 for ; Thu, 4 Feb 2021 15:30:13 -0800 (PST) Received: by mail-qt1-x849.google.com with SMTP id z19so3835224qtv.20 for ; Thu, 04 Feb 2021 15:30:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:cc; bh=+DMZQSm/uaEUXJw9EFN7NIYygzQ6mIPslbKoTBQUvsQ=; b=WiPF6RbkD/Zm7dcNkPvnl02p57tzN9cu7c9cNHJG1mmc9lGt7Z0/nB7zndD/gk4np6 K7Knd7DIOUPQQKVSo9sQT1kQ1Ggydy/VBFeXlwnNaJHBtZCBXhaxCn6ealEFq/igVY0e mVLER0rjGQAI9zK3qxTZJc5fv57Y9+vjW+ARS+hfIuFhBgTxQUezL7XmkIJxjWBMUKav E1jdUPerE/x4HE1ZuHvkOzho9FTcCj5dK3y8OwL3yR6WyZRLcwRUrWTwLIu/qP4ha47n +PlyqcV1VXzedm4o4MT5Ss2bGyDATHCeszcD7hdlBC5vzDHxIPBbNrCayImbF5uwe1r4 QWZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:cc; bh=+DMZQSm/uaEUXJw9EFN7NIYygzQ6mIPslbKoTBQUvsQ=; b=RfwwRebO5UCdzfA3ohvVqOTzey2pAlZPFCRmwz5JY2M3Vjw/yJAvHShFKGt+rMguq5 F17GSYD7DPHJm0ZzR2b7pThroxfGiWzoazFJkK1qAaCLwicFVBYvQFSS/2lJeeo9G8Yt /KkASrQF47pYGXLS5b7us2uesrqpCFNPtvm1/OLLL6PjdqtH2gfaU5u4CHAkphB+Jaet QSE3veFJ2yqQeG20NMiWgXmi2YVvWFfD/95bKriNEn8jPa0pCmjX7Rpr/cB+0wIeATPH vXnMIMzngLRSe4BmKfUlhpl27/hgJ4gS9BtDam5uZ01sRfwxIKpMlJLT9taWFm7snG5C c6Ew== X-Gm-Message-State: AOAM532rYSgWpFQ8loPYpo/en1WZxEtitz5KKUWomoRwCiPI9CI9SPcB 4B6uVU5lZznTgawuWDbZjrDSTIGHKHfW47kMmQ== X-Google-Smtp-Source: ABdhPJx3kg9I/fA5bBDYRFvfPdVTeyCfD6xE3qxRlCYQfUGKmYYfcWiSsJ3nZEdsX8iZC/R5fjsrlL6fZPjSx22Y7g== Sender: "kaleshsingh via sendgmr" X-Received: from kaleshsingh.c.googlers.com ([fda3:e722:ac3:10:14:4d90:c0a8:2145]) (user=kaleshsingh job=sendgmr) by 2002:ad4:5be9:: with SMTP id k9mr1715632qvc.18.1612481412377; Thu, 04 Feb 2021 15:30:12 -0800 (PST) Date: Thu, 4 Feb 2021 23:28:50 +0000 In-Reply-To: <20210204232854.451676-1-kaleshsingh@google.com> Message-Id: <20210204232854.451676-2-kaleshsingh@google.com> Mime-Version: 1.0 References: <20210204232854.451676-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog Subject: [PATCH v2 2/2] dmabuf: Add dmabuf inode number to /proc/*/fdinfo From: Kalesh Singh Cc: jannh@google.com, jeffv@google.com, keescook@chromium.org, surenb@google.com, minchan@kernel.org, hridya@google.com, kernel-team@android.com, Kalesh Singh , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Alexey Dobriyan , "Eric W. Biederman" , Andrew Morton , Alexey Gladkov , Michel Lespinasse , Bernd Edlinger , Andrei Vagin , Yafang Shao , Christian Brauner , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org If a FD refers to a DMA buffer add the DMA buffer inode number to /proc//fdinfo/ and /proc//task//fdindo/. The dmabuf inode number allows userspace to uniquely identify the buffer and avoids a dependency on /proc//fd/* when accounting per-process DMA buffer sizes. Signed-off-by: Kalesh Singh --- Changes in v2: - Update patch desciption drivers/dma-buf/dma-buf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 9ad6397aaa97..d869099ede83 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -414,6 +414,7 @@ static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file) { struct dma_buf *dmabuf = file->private_data; + seq_printf(m, "dmabuf_inode_no:\t%lu\n", file_inode(file)->i_ino); seq_printf(m, "size:\t%zu\n", dmabuf->size); /* Don't count the temporary reference taken inside procfs seq_show */ seq_printf(m, "count:\t%ld\n", file_count(dmabuf->file) - 1);