From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 806503128AC; Thu, 11 Dec 2025 15:21:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765466516; cv=none; b=Z+iAOpvHRGTcWIepEwn7CmeqvMhP6PRmGit4GM/vGwCi1skbdhD4OEsnPeZzXPIpzbik41s6J1qJ+YuJtgNGEFnB8sUBRWRe4vgtpaDhrg82RCfiMqfKZU4lXmseqV2Kh2HjQ9X74Lj7Ky2Tjsbq7jK/awZsxxnVQLNLpu9x3lU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765466516; c=relaxed/simple; bh=xKTkBQxvzaKb2/BHpHJKS548Bqa8fPqHgj5k2JtaR0U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pKDi9aUJGG3Zb7KiylCO5Mfzdj85fmpbU4FXa6wa1mjwwNHPgkYrrIyim9ZA1I28xPlPf+tNPgq8GZ8DcxLR+hCg6pcFUpgveLFqiNyAdlkVbdjlUk0DY8ATAqtQ0MKOu00U9PK5dtIlO1xtEkFkvQE6Xuux/5YP3au9EJMUmTY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=p8LCE3PD; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="p8LCE3PD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 54913C113D0; Thu, 11 Dec 2025 15:21:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1765466516; bh=xKTkBQxvzaKb2/BHpHJKS548Bqa8fPqHgj5k2JtaR0U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p8LCE3PDI0L8GG1v6klE0Os1Q/pTcVw8vhzm2WuwuRz7KklyWihdL3lF2ccmM4aih oI2/yZm/5/L9LmKmGQ6clFIMMIJlVTR71EmL3la1UW8WpGbPWwbJ7R6mA7vPFozISM XpO1XAYaZx7be3b4Aia4xTaZUWw4UqMq9LXIDjShOLPseWERIjyWMbIKZznIKxTaBQ GQhm8OpXEDavN3/qSsie4LZFbu3PV0VIja6JP2Tm5oFRDpWtQDXV6xfk4gguT/RkgW qmJ/uNUUpsE2qvtRkPWN/dfQQNL7e6eiNxMs4Sb9ZGm1APC/JSt3eIx/rnLibGP7XZ eZctnHuouMmFw== From: Chuck Lever To: Al Viro , Christian Brauner Cc: , linux-ext4@vger.kernel.org, , , hirofumi@mail.parknet.co.jp, almaz.alexandrovich@paragon-software.com, tytso@mit.edu, adilger.kernel@dilger.ca, Volker.Lendecke@sernet.de, Chuck Lever Subject: [PATCH v2 4/6] ext4: Report case sensitivity in fileattr_get Date: Thu, 11 Dec 2025 10:21:14 -0500 Message-ID: <20251211152116.480799-5-cel@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251211152116.480799-1-cel@kernel.org> References: <20251211152116.480799-1-cel@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chuck Lever Report ext4's case sensitivity behavior via file_kattr.case_info. ext4 always preserves case at rest. Case sensitivity is a per-directory setting in ext4. If the queried inode is a casefolded directory, report Unicode case-insensitive matching; otherwise report case-sensitive (standard POSIX behavior). This enables file_getattr to report the case sensitivity behavior of individual directories within an ext4 filesystem. Signed-off-by: Chuck Lever --- fs/ext4/ioctl.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index a93a7baae990..d760657bb9e2 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -996,6 +996,18 @@ int ext4_fileattr_get(struct dentry *dentry, struct file_kattr *fa) if (ext4_has_feature_project(inode->i_sb)) fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid); + /* + * ext4 always preserves case. If this inode is a casefolded + * directory, report Unicode case-insensitive; otherwise + * report case-sensitive (standard POSIX behavior). + */ + if (IS_CASEFOLDED(inode)) + fa->case_info = FILEATTR_CASEFOLD_UNICODE | + FILEATTR_CASE_PRESERVING; + else + fa->case_info = FILEATTR_CASEFOLD_NONE | + FILEATTR_CASE_PRESERVING; + return 0; } -- 2.52.0