{"id":2220012,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2220012/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260405195007.1306-6-DefendTheDisabled@gmail.com/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.2/projects/8/?format=json","name":"Linux ext4 filesystem development","link_name":"linux-ext4","list_id":"linux-ext4.vger.kernel.org","list_email":"linux-ext4@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260405195007.1306-6-DefendTheDisabled@gmail.com>","list_archive_url":null,"date":"2026-04-05T19:50:01","name":"[5/6] fat: map ptime to FAT creation time with rename-over","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"d561895633441885f1d102217c2aa8350ad8a764","submitter":{"id":93064,"url":"http://patchwork.ozlabs.org/api/1.2/people/93064/?format=json","name":"Sean Smith","email":"defendthedisabled@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260405195007.1306-6-DefendTheDisabled@gmail.com/mbox/","series":[{"id":498804,"url":"http://patchwork.ozlabs.org/api/1.2/series/498804/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/list/?series=498804","date":"2026-04-05T19:49:56","name":"provenance_time (ptime): a new settable timestamp for cross-filesystem provenance","version":1,"mbox":"http://patchwork.ozlabs.org/series/498804/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2220012/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2220012/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=XdDrRQQ5;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; helo=mail.ozlabs.org;\n envelope-from=srs0=xnca=ce=vger.kernel.org=linux-ext4+bounces-15647-patchwork-incoming=ozlabs.org@ozlabs.org;\n receiver=patchwork.ozlabs.org)","gandalf.ozlabs.org;\n arc=pass smtp.remote-ip=\"2600:3c04:e001:36c::12fc:5321\"\n arc.chain=subspace.kernel.org","gandalf.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","gandalf.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=XdDrRQQ5;\n\tdkim-atps=neutral","gandalf.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15647-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"XdDrRQQ5\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=209.85.167.176","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from mail.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fpjm65KXHz1xy1\n\tfor ; Mon, 06 Apr 2026 05:52:22 +1000 (AEST)","from mail.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3])\n\tby gandalf.ozlabs.org (Postfix) with ESMTP id 4fpjm64rQNz4wG6\n\tfor ; Mon, 06 Apr 2026 05:52:22 +1000 (AEST)","by gandalf.ozlabs.org (Postfix)\n\tid 4fpjm64kwDz4wG7; Mon, 06 Apr 2026 05:52:22 +1000 (AEST)","from tor.lore.kernel.org (tor.lore.kernel.org\n [IPv6:2600:3c04:e001:36c::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby gandalf.ozlabs.org (Postfix) with ESMTPS id 4fpjm21kpPz4wG6\n\tfor ; Mon, 06 Apr 2026 05:52:18 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby tor.lore.kernel.org (Postfix) with ESMTP id 96A2D300538C\n\tfor ; Sun, 5 Apr 2026 19:50:54 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 4DC42342173;\n\tSun, 5 Apr 2026 19:50:48 +0000 (UTC)","from mail-oi1-f176.google.com (mail-oi1-f176.google.com\n [209.85.167.176])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id CB2F837F015\n\tfor ; Sun, 5 Apr 2026 19:50:46 +0000 (UTC)","by mail-oi1-f176.google.com with SMTP id\n 5614622812f47-470145d7e6fso433608b6e.2\n for ;\n Sun, 05 Apr 2026 12:50:46 -0700 (PDT)","from localhost.localdomain (c-73-5-99-191.hsd1.la.comcast.net.\n [73.5.99.191])\n by smtp.gmail.com with ESMTPSA id\n 5614622812f47-46f46160155sm4547428b6e.17.2026.04.05.12.50.42\n (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n Sun, 05 Apr 2026 12:50:44 -0700 (PDT)"],"ARC-Seal":["i=2; a=rsa-sha256; d=ozlabs.org; s=201707; t=1775418742; cv=pass;\n\tb=snNx4FWJhvE7wNpkPaeMkPm8xEh5GHZZ8GNIbsYwjnu3C9fZaxULLuA0wECMzcyivrnOqX+VYJJNhJed2b+g1h1gPHzQK7ebq8ys79dFRLJLWoH9B+F86+Bo+Zc3Tnlxvpus1NyvU8SKJvE61hLs0G1nZG2XKIvSaYbQ7eMjgIuslaYneTxjDnb7rvDjTZwUYqErojruGqEEHm8b8h7bQUV9hBlBtbQnutkGsdCqkYPTS8l5wT8TdL2X7sgndc6inxma2wB1qLYXF4p091GqAD5C4nmbYjWHUZrNy2wnD/E9E3WTaRPccobu06tLI0V29QiDgr3kqqZ7lBmlsnWSWw==","i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1775418648; cv=none;\n b=K9TXlbK6Gks7/wKPBwqCfRbrCt1f+2DQAJmV6LpbggJtSCSpKp/Z6jFDfLvHtB7BN9qf7n2Yvvs6bldRJ10jVcPe/W+A6ezmXgjD71isAQu2Wigoss8eiDcjVF9c8CRy2XWH8dfohcccJNM8vGIr8H77HnQW4k53nc/1IbXDl8w="],"ARC-Message-Signature":["i=2; a=rsa-sha256; d=ozlabs.org; s=201707;\n\tt=1775418742; c=relaxed/relaxed;\n\tbh=K8lGtdviJ/yNeFObSgzOPOsYD9zf1PXG9ZhAjN6EY4Q=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=eL9KbVfWPSNUkV+GA3n3fino6t+huT/DqhwSYct44lQx8wJgKd36DY6vtMFu804HsRrCuIs9VG9+RWK1s9cm7ibEZt1JM18r7vReTQKYccYRPdAXqStuSstoj6EVTq1NmIA1KxQATihxvJazYDKh63HE5H6W2ZhAQcrwC2Fh1hbQalbcda04/2kc+afDgHBNzVZFooatP5Jaw6b8I1IFBNhA0J8F5NdX5dAP/VSKJS00WC4du2GIqxKz8e6+9HyVMIUDLQGTB03VEzUFAvCYKLqotmnbdDcuGg0Lj66YmF50Z0UroWgj2soBnCnWPLAQsQ28HtHYKP27iU3z2xq/FA==","i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1775418648; c=relaxed/simple;\n\tbh=Y0VePmfDKqj2Wr4uBDtOu+PZcxWOL70k8AGZMMUQvs4=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=TfUVY7k3Md6X0MBRhzjLVn14DZIi5hnbiTphsqJOvhFiqWnW4xHLiot7N/bdQD29sU9nxInuHtn4qjGtMOsWv2ew4UDhCNvlkoCqoIFc1DsFUAaBlIwFYxfTGFgkViGesud4uhzKW6J0eQLNgHoxz9fMJp20SHrG1EwtnkbgYbI="],"ARC-Authentication-Results":["i=2; gandalf.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com; dkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=XdDrRQQ5; dkim-atps=neutral;\n spf=pass (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15647-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org","i=1; smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com;\n spf=pass smtp.mailfrom=gmail.com;\n dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=XdDrRQQ5; arc=none smtp.client-ip=209.85.167.176"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=gmail.com; s=20251104; t=1775418646; x=1776023446;\n darn=vger.kernel.org;\n h=content-transfer-encoding:mime-version:references:in-reply-to\n :message-id:date:subject:cc:to:from:from:to:cc:subject:date\n :message-id:reply-to;\n bh=K8lGtdviJ/yNeFObSgzOPOsYD9zf1PXG9ZhAjN6EY4Q=;\n b=XdDrRQQ5qPYkH9zR2x/+NtoWTga+XHyaTfGu1QNncVF0j2P77Okxr4pSiPY5tVZ1XK\n 2eV4SZrhm1H7mdLog/K+3uJqJ8MwfupaNM0WfLwj0hV6rwZzzGKUv5gq+7j4dn1J1rRG\n Lx+PUov62S0/fA0CNBAT+tn5RjkXh+UarmL6Nj40U+N5kYOp+Z2fsSjLtMUBbS3RmLVv\n zsHg78reMJJuXVPkHgVXT/jF0GyodEaZCMktPIBj4wCWdrB+Hf/s3w7hNhFS3vjI7UQ3\n EZRt4JkHYq/34JFuYw0TKcAog1ZpCcLAVCD3CTPUajc5sl6NAIsdyJnpZSAccg4KNZDz\n LxvQ==","X-Google-DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=1e100.net; s=20251104; t=1775418646; x=1776023446;\n h=content-transfer-encoding:mime-version:references:in-reply-to\n :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from\n :to:cc:subject:date:message-id:reply-to;\n bh=K8lGtdviJ/yNeFObSgzOPOsYD9zf1PXG9ZhAjN6EY4Q=;\n b=EwP85Wnj3jkA1LNE6/q7tf1vgH2KWmqFuUL28ubJeaSu2aQoMoqRJkTCkWwa5kZNN5\n ZLaYbxgcVrqahgtqT2HRO/tfJ3V5SqlaZDQy/0J8LV+020MTiQph9e7eoI7aHA4/7XDP\n iVQHvHLVXzEVTJqxopTpWFKJevNPYUr2ElsRKzN0wdEnk0YCEYEzpJsIkVtWGcC79dh+\n CSgr58TqHlv9jVjAdM2SwGSfOgHB8j+D6Q8gumF+JRXR0uLtd7a/1vCZ0XjCfBlNzM8B\n G3KT78uuaBtP2wCtkkgcT+KGXj1U+cwiok/M4ct7uNezlrziJjZQ5Ho0l4JhM4JWBXeD\n q7Rw==","X-Gm-Message-State":"AOJu0YwwXspoLpSD4ErJ+n2LNE0y81hw4gXHiX1UESx6hSClS/c4gsMY\n\trBwEEvJpLWmSa7eRnW0CrJa1bvSM/nkWQXys+KHsXmO51+fIjlcWpmag","X-Gm-Gg":"AeBDietq0UPWr/UCI/4P8NVuIGC9ZKuUkvDfVEu++QZcrkyj9Ury4DaoYQ90l7Tn61e\n\tp7EsgWZcFRQ2w0+vlbhGSBrqgj2HTc40TVsXsr1/pbt2LDreeJNTnRRFw8ujWRkPrEWBobnGLPY\n\t+IvoZga0K4W/VEuLLGG2htkWZHoOv2PoDKmq17jYky1ZIxS5UlU9NQ69wUi/wf4wGSKOAAjVCf/\n\tNC6vX3g9iIdyJpL7jdKZ6UeFhNHp8ED8np/J44NiD26z3TLvoEWONHaiFFkk3Qz/kaQjUMsyFY3\n\tZaBOxFummzzpG7FLO8tkLU0tUtBmTW8O9lXFm1OvshxP9hONRD3I1o1J0H6xK7opvAR66jSUU5T\n\tFd7vKHI/9Iu39qHL4/fClfo/+L3KOtUgn44aiucWWd9+6s05ATvjf5RiCtEM7df1I3aJBOvj6RV\n\tzP1Y1Dj2Mrtv4d7UfqqUHBWSki8gdcDcKK7atpLWaMVGosMDCoZ70kI1cE6faYmyqRikxXJRfAF\n\tY9HvwYMss2dykg=","X-Received":"by 2002:a05:6808:1511:b0:46a:738f:7666 with SMTP id\n 5614622812f47-46ef7a12be7mr5024308b6e.36.1775418645800;\n Sun, 05 Apr 2026 12:50:45 -0700 (PDT)","From":"Sean Smith ","X-Google-Original-From":"Sean Smith ","To":"linux-fsdevel@vger.kernel.org","Cc":"linux-ext4@vger.kernel.org,\n\tlinux-btrfs@vger.kernel.org,\n\ttytso@mit.edu,\n\tdsterba@suse.com,\n\tdavid@fromorbit.com,\n\tbrauner@kernel.org,\n\tosandov@osandov.com,\n\talmaz@kernel.org,\n\thirofumi@mail.parknet.co.jp,\n\tlinkinjeon@kernel.org,\n\tSean Smith ","Subject":"[PATCH 5/6] fat: map ptime to FAT creation time with rename-over","Date":"Sun, 5 Apr 2026 14:50:01 -0500","Message-ID":"<20260405195007.1306-6-DefendTheDisabled@gmail.com>","X-Mailer":"git-send-email 2.51.0.windows.1","In-Reply-To":"<20260405195007.1306-1-DefendTheDisabled@gmail.com>","References":"<20260405195007.1306-1-DefendTheDisabled@gmail.com>","Precedence":"bulk","X-Mailing-List":"linux-ext4@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Spam-Status":"No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tFREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"},"content":"Map ptime to the FAT/VFAT creation time field. Only active on VFAT\n(long filename) mounts since plain FAT12/FAT16 lack creation time.\nFAT32 creation time has 2-second precision.\n\nGetattr: report creation time as ptime (VFAT only, via isvfat check).\nSetattr: write ptime to i_crtime.\nRename-over: save target creation time before detach, restore to\n source after attach. Preserves creation time across atomic saves.\n\nSigned-off-by: Sean Smith \n---\n fs/fat/file.c | 6 ++++++\n fs/fat/namei_vfat.c | 20 ++++++++++++++++++--\n 2 files changed, 24 insertions(+), 2 deletions(-)","diff":"diff --git a/fs/fat/file.c b/fs/fat/file.c\nindex 4fc49a614..9d1fcc554 100644\n--- a/fs/fat/file.c\n+++ b/fs/fat/file.c\n@@ -413,6 +413,10 @@ int fat_getattr(struct mnt_idmap *idmap, const struct path *path,\n \t\tstat->result_mask |= STATX_BTIME;\n \t\tstat->btime = MSDOS_I(inode)->i_crtime;\n \t}\n+\tif (sbi->options.isvfat && (request_mask & STATX_PTIME)) {\n+\t\tstat->result_mask |= STATX_PTIME;\n+\t\tstat->ptime = MSDOS_I(inode)->i_crtime;\n+\t}\n \n \treturn 0;\n }\n@@ -564,6 +568,8 @@ int fat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,\n \t\tfat_truncate_time(inode, &attr->ia_mtime, S_MTIME);\n \tattr->ia_valid &= ~(ATTR_ATIME|ATTR_CTIME|ATTR_MTIME);\n \n+\tif (attr->ia_valid & ATTR_PTIME)\n+\t\tMSDOS_I(inode)->i_crtime = attr->ia_ptime;\n \tsetattr_copy(idmap, inode, attr);\n \tmark_inode_dirty(inode);\n out:\ndiff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c\nindex 47ff083cf..f1e2eadf8 100644\n--- a/fs/fat/namei_vfat.c\n+++ b/fs/fat/namei_vfat.c\n@@ -975,8 +975,24 @@ static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,\n \t}\n \tinode_inc_iversion(new_dir);\n \n-\tfat_detach(old_inode);\n-\tfat_attach(old_inode, new_i_pos);\n+\t/* ptime rename-over: save target creation time */\n+\t{\n+\t\tstruct timespec64 saved_crtime = {};\n+\t\tbool inherit_crtime = false;\n+\n+\t\tif (new_inode && S_ISREG(old_inode->i_mode) &&\n+\t\t S_ISREG(new_inode->i_mode) && old_inode->i_nlink == 1) {\n+\t\t\tsaved_crtime = MSDOS_I(new_inode)->i_crtime;\n+\t\t\tinherit_crtime = true;\n+\t\t}\n+\n+\t\tfat_detach(old_inode);\n+\t\tfat_attach(old_inode, new_i_pos);\n+\n+\t\tif (inherit_crtime)\n+\t\t\tMSDOS_I(old_inode)->i_crtime = saved_crtime;\n+\t}\n+\n \terr = vfat_sync_ipos(new_dir, old_inode);\n \tif (err)\n \t\tgoto error_inode;\n","prefixes":["5/6"]}