From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793097879; b=H06tsJ4zIC1pkWRiVRXu5yAjA7KS6ykNoOZQ6CLm4kvpePUH7mKYqKjOxQniAa39740Q nsAAPIOvCP/zWsQl3stJWVo4tpVGR2lVnCTD72EPb8OoUCWPblcM59yOJmOmctICBlhdj 16icO8NuUcpiy7ZEmPMSEoKWAvcMdE3KohB1OV5EEBqYi1yVzc5DR+muFx9oT3rFPUZs7 M6G/AfiDQLdjBdX632cG9uN0JyFgXZHXHs00rV21SVwraka/6A2vnmkwRO6zpl5nPYoXQ CpJOvKEgNR+FGqBiB5w7pPpAYyaDNNU6lDRaMGy7luEK0kP4AkNiF3TLRnaVMa05f7Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793097879; h=Received:DKIM-Signature:Message-ID:Subject:From:To:Cc:Date: In-Reply-To:References:Autocrypt:Content-Type: Content-Transfer-Encoding:User-Agent:MIME-Version; bh=VOku0TcLYfrW/DAPJZMDLhq37sTK+7BPMQhK2+Un/Hs=; b=FiMGakAnN1s+0wGU1fP1ztqwV3Gh4BcyrNMJ8fTQDuKJKO3q5NYAwiE6EKCpG9ffxWaT 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header.b=m7UU5Oy/ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3DC4B1F01828; Tue, 27 Oct 2026 10:44:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793097878; bh=VOku0TcLYfrW/DAPJZMDLhq37sTK+7BPMQhK2+Un/Hs=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=m7UU5Oy/pq0zI0KSlgl/SZSQTVBA3saxOHZUT3N69jbt9iLfC7VDCsyjTqcSrwlee INR1zC/TXcKJba7WR0MdpzLA1LTKulOg/FUTN4lmdSizfIt6EpRIAQVa4eozT+Y6ah SbdvXS/fRNRoikk1W4EJXpNxKSckKilFFkdKhW8NoVOkHXi0efLv2bOTRqV5uKUgAx IzaRTKqHSJo9gW8sRkrB4wiJ1BX71AxuderZj0AWb8PfUxa4wMcUn68cVrh5LZaUeN M/TmulNzqX7jOqzj7X3KSDjMlW3hNGO7BT0TtlJ3bU5WAi956xh8Iod10802v/OeLD ngfWGk2LRX10g== Message-ID: <54dd1452c761cbeb9555b6ef5c8411aab0ac8001.camel@kernel.org> Subject: Re: [PATCH] exfat: preserve creation times during rename From: Jeff Layton To: Hungyu Lin , linkinjeon@kernel.org Cc: sj1557.seo@samsung.com, yuezhang.mo@sony.com, exfat@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, jack@suse.cz Date: Tue, 27 Oct 2026 06:44:35 -0400 In-Reply-To: <20261027091353.74642-1-dennylin0707@gmail.com> References: <20261027091353.74642-1-dennylin0707@gmail.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf CBYyUE8QJpvTZyfUHNYldXlrjO6n5MdOempLqWpfOmcGkwnyNRBR46g/jf8KnPRwXs509yAqDB6sE 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AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.2 (3.60.2-2.fc44) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Tue, 2026-10-27 at 09:13 +0000, Hungyu Lin wrote: > exfat_rename() resets the destination parent directory's i_crtime after > every successful rename. A normal mv within that directory therefore > changes its STATX_BTIME, and the new creation time is also written to > disk. Moving a child does not recreate its parent directory. >=20 > The function also resets i_crtime on an overwritten target inode. An > application holding an open file descriptor can observe its birth time > change even though it still refers to the same inode. >=20 > Remove both creation-time updates. simple_rename_timestamp() already > updates the modification and change times required by rename, while > creation times should remain unchanged. Jeff Layton questioned these > updates during the timestamp accessor conversion, but they remain in > the current implementation. >=20 > Fixes: 5f2aa075070c ("exfat: add inode operations") > Suggested-by: Jeff Layton > Link: https://lore.kernel.org/r/bb698e294b0d4dbbbad4b94048693360010b8010.= camel@kernel.org > Signed-off-by: Hungyu Lin > --- > fs/exfat/namei.c | 2 -- > 1 file changed, 2 deletions(-) >=20 > diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c > index 68ddb9c5504f..d01280570f70 100644 > --- a/fs/exfat/namei.c > +++ b/fs/exfat/namei.c > @@ -1293,7 +1293,6 @@ static int exfat_rename(const struct mnt_idmap *idm= ap, > =20 > inode_inc_iversion(new_dir); > simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); > - EXFAT_I(new_dir)->i_crtime =3D current_time(new_dir); > exfat_truncate_inode_atime(new_dir); > if (IS_DIRSYNC(new_dir) && size !=3D i_size_read(new_dir)) > exfat_sync_inode(new_dir); > @@ -1331,7 +1330,6 @@ static int exfat_rename(const struct mnt_idmap *idm= ap, > exfat_warn(sb, "abnormal access to an inode dropped"); > WARN_ON(new_inode->i_nlink =3D=3D 0); > } > - EXFAT_I(new_inode)->i_crtime =3D current_time(new_inode); > } > =20 > unlock: To be clear, i_crtime is equivalent to the btime, so it shouldn't change on a rename. Reviewed-by: Jeff Layton