From patchwork Thu Jun 23 22:06:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Kalesh Singh X-Patchwork-Id: 12893229 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 979B4CCA47C for ; Thu, 23 Jun 2022 22:06:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229977AbiFWWGg (ORCPT ); Thu, 23 Jun 2022 18:06:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44226 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229920AbiFWWGf (ORCPT ); Thu, 23 Jun 2022 18:06:35 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EDB975677A for ; Thu, 23 Jun 2022 15:06:33 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id h82-20020a25d055000000b00668b6a4ee32so667660ybg.3 for ; Thu, 23 Jun 2022 15:06:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc:content-transfer-encoding; bh=LuVwJu2XTJotGIIzCTAGr4F0lNY10/cZV2iS+VHdvuo=; b=IoqZwDtQveOkId40Codht810g407pd1np3iZsZaGpC0V+df4/QXkWF3oB4Mp5XiG4z AkHfVLodnJPGIXXOQOLZpEs3oP05HDStEn81Gzp/08IpMjXs+0WkBYIt5XFIGs4UBBt9 vDn9LYFjKXjjip1WPCH+zWI6ouiNaFo7GzIbYf9UpUCSYtX8reoBMCBcFfdoHjTENNmM rb7T+ScF4HCojuFb8n6t9OTfcdLiboWa5W6743biCT0C/MQg55OQP00HVu/5M2H9xT2M 1lmQhJi74VDMDyRTyFxvnlsIezy7d1O119TmXhSw1uakyz4IwS29YleI9L5cXoCl9O+V 3mFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc:content-transfer-encoding; bh=LuVwJu2XTJotGIIzCTAGr4F0lNY10/cZV2iS+VHdvuo=; b=BQ+pMtar9++FMlkBdT2WYButT8Ym3HaiO/0D+v+PmtE1HE64YEKzIgtqPQpOAS5T3g xBTvhAQmQxlZzn5QHnGgqmbkCoQSnxsz21JVSKsM5vmiEm23p3AHiYgGoEGlJl8jISHv 1aF5FJNt973VJ3L36s0p37bOgHhZmt767pCphCdSmYgI7QdalP8u/9X39BLJPc3IS93A QGn4ugpklU/d0pEVzZYPn2BLkZA9Y7dQAC79DtplMGZPrk2QmQ/81FtZ0B/tgpH2YMqB 0j/qxSTjdpAwmUCDZgYFpTIMy4V1QLA6qUrz6rphSeHDg1ynRTTJgewAfg9lgumZ9xKJ uufA== X-Gm-Message-State: AJIora+kRdz7uzs4htTz53LnjULPSUt23Li1TG4sXMQc77vPvXcQCltX LP3hTS/tRR15LR++Ue5wmjV38WJZv8vVYDmE2g== X-Google-Smtp-Source: AGRyM1sUtTt9Hgz8VwrY8RPCyKlElkJLkRs2tNxEPPEXYBDiEywoCy3hLf1D/wC013YTlrfFlZGqN4FoX1llld8RZQ== X-Received: from kaleshsingh.mtv.corp.google.com ([2620:15c:211:200:ac62:20a7:e3c5:c221]) (user=kaleshsingh job=sendgmr) by 2002:a25:9305:0:b0:668:d3a8:cb0b with SMTP id f5-20020a259305000000b00668d3a8cb0bmr11286577ybo.156.1656021993192; Thu, 23 Jun 2022 15:06:33 -0700 (PDT) Date: Thu, 23 Jun 2022 15:06:06 -0700 In-Reply-To: <20220623220613.3014268-1-kaleshsingh@google.com> Message-Id: <20220623220613.3014268-2-kaleshsingh@google.com> Mime-Version: 1.0 References: <20220623220613.3014268-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.37.0.rc0.161.g10f37bed90-goog Subject: [PATCH v2 1/2] procfs: Add 'size' to /proc//fdinfo/ From: Kalesh Singh To: ckoenig.leichtzumerken@gmail.com, christian.koenig@amd.com, viro@zeniv.linux.org.uk, hch@infradead.org, stephen.s.brennan@oracle.com, David.Laight@ACULAB.COM Cc: ilkos@google.com, tjmercier@google.com, surenb@google.com, kernel-team@android.com, Kalesh Singh , Jonathan Corbet , Sumit Semwal , Andrew Morton , Johannes Weiner , Christoph Anton Mitterer , Paul Gortmaker , Mike Rapoport , Randy Dunlap , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org To be able to account the amount of memory a process is keeping pinned by open file descriptors add a 'size' field to fdinfo output. dmabufs fds already expose a 'size' field for this reason, remove this and make it a common field for all fds. This allows tracking of other types of memory (e.g. memfd and ashmem in Android). Signed-off-by: Kalesh Singh Reviewed-by: Christian König --- Changes in v2: - Add Christian's Reviewed-by Changes from rfc: - Split adding 'size' and 'path' into a separate patches, per Christian - Split fdinfo seq_printf into separate lines, per Christian - Fix indentation (use tabs) in documentaion, per Randy Documentation/filesystems/proc.rst | 12 ++++++++++-- drivers/dma-buf/dma-buf.c | 1 - fs/proc/fd.c | 9 +++++---- 3 files changed, 15 insertions(+), 7 deletions(-) diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index 1bc91fb8c321..779c05528e87 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -1886,13 +1886,14 @@ if precise results are needed. 3.8 /proc//fdinfo/ - Information about opened file --------------------------------------------------------------- This file provides information associated with an opened file. The regular -files have at least four fields -- 'pos', 'flags', 'mnt_id' and 'ino'. +files have at least five fields -- 'pos', 'flags', 'mnt_id', 'ino', and 'size'. + The 'pos' represents the current offset of the opened file in decimal form [see lseek(2) for details], 'flags' denotes the octal O_xxx mask the file has been created with [see open(2) for details] and 'mnt_id' represents mount ID of the file system containing the opened file [see 3.5 /proc//mountinfo for details]. 'ino' represents the inode number of -the file. +the file, and 'size' represents the size of the file in bytes. A typical output is:: @@ -1900,6 +1901,7 @@ A typical output is:: flags: 0100002 mnt_id: 19 ino: 63107 + size: 0 All locks associated with a file descriptor are shown in its fdinfo too:: @@ -1917,6 +1919,7 @@ Eventfd files flags: 04002 mnt_id: 9 ino: 63107 + size: 0 eventfd-count: 5a where 'eventfd-count' is hex value of a counter. @@ -1930,6 +1933,7 @@ Signalfd files flags: 04002 mnt_id: 9 ino: 63107 + size: 0 sigmask: 0000000000000200 where 'sigmask' is hex value of the signal mask associated @@ -1944,6 +1948,7 @@ Epoll files flags: 02 mnt_id: 9 ino: 63107 + size: 0 tfd: 5 events: 1d data: ffffffffffffffff pos:0 ino:61af sdev:7 where 'tfd' is a target file descriptor number in decimal form, @@ -1962,6 +1967,7 @@ For inotify files the format is the following:: flags: 02000000 mnt_id: 9 ino: 63107 + size: 0 inotify wd:3 ino:9e7e sdev:800013 mask:800afce ignored_mask:0 fhandle-bytes:8 fhandle-type:1 f_handle:7e9e0000640d1b6d where 'wd' is a watch descriptor in decimal form, i.e. a target file @@ -1985,6 +1991,7 @@ For fanotify files the format is:: flags: 02 mnt_id: 9 ino: 63107 + size: 0 fanotify flags:10 event-flags:0 fanotify mnt_id:12 mflags:40 mask:38 ignored_mask:40000003 fanotify ino:4f969 sdev:800013 mflags:0 mask:3b ignored_mask:40000000 fhandle-bytes:8 fhandle-type:1 f_handle:69f90400c275b5b4 @@ -2010,6 +2017,7 @@ Timerfd files flags: 02 mnt_id: 9 ino: 63107 + size: 0 clockid: 0 ticks: 0 settime flags: 01 diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 32f55640890c..5f2ae38c960f 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -378,7 +378,6 @@ static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file) { struct dma_buf *dmabuf = file->private_data; - 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); seq_printf(m, "exp_name:\t%s\n", dmabuf->exp_name); diff --git a/fs/proc/fd.c b/fs/proc/fd.c index 913bef0d2a36..464bc3f55759 100644 --- a/fs/proc/fd.c +++ b/fs/proc/fd.c @@ -54,10 +54,11 @@ static int seq_show(struct seq_file *m, void *v) if (ret) return ret; - seq_printf(m, "pos:\t%lli\nflags:\t0%o\nmnt_id:\t%i\nino:\t%lu\n", - (long long)file->f_pos, f_flags, - real_mount(file->f_path.mnt)->mnt_id, - file_inode(file)->i_ino); + seq_printf(m, "pos:\t%lli\n", (long long)file->f_pos); + seq_printf(m, "flags:\t0%o\n", f_flags); + seq_printf(m, "mnt_id:\t%i\n", real_mount(file->f_path.mnt)->mnt_id); + seq_printf(m, "ino:\t%lu\n", file_inode(file)->i_ino); + seq_printf(m, "size:\t%lli\n", (long long)file_inode(file)->i_size); /* show_fd_locks() never deferences files so a stale value is safe */ show_fd_locks(m, file, files);