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 E7EF51A680A; Sat, 25 Apr 2026 01:53:28 +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=1777082009; cv=none; b=kmxwC3Q9JVMACJ0YugtCEO+gDWeZCoxEiXlBYRrR0HSDi0Y6BUgHXnJCBNAkFmeOQjGeARmCot+zUss3SzFgnxJhh0r3U5hQrLLohSVrUHWbCBeUI8quzVgSeX62MTc+2Ct1vH1Fe3WAmKyhUUYztgl6pNBYFVXrNKQBHItfTew= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777082009; c=relaxed/simple; bh=TFF/jZiZrtLjdmF8xjSA6CfyQJOvsGBZ0ycggreXc9A=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=SsGYBm64AEYGHrHBp7FNHNgklemihDHKJ1Z1YhaUsBtmTW+u+HM3Prh1maBzOOTZsvR/f/8AM/vOduds/2Xpn9ogb5FAGjh/RJhBkHAX6RbfwRmD2SgplKwz3fGga5q3wKjrIR/FZ+rHoDBb1VlDc7P2kXKvSBdxYArG80Uhk44= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iAJ/CuUk; 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="iAJ/CuUk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88F77C2BCB2; Sat, 25 Apr 2026 01:53:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777082008; bh=TFF/jZiZrtLjdmF8xjSA6CfyQJOvsGBZ0ycggreXc9A=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=iAJ/CuUkYBRHUgd5Vbk3R/RuxMgydkd1Q6LIHyPEp6KVnjtqQH541808e5rOlhi/N xJaIk8KIl309tG3fxJsIz2dOLkIvk4YMdWbQCy4X+8763pE3WFjtogZlfJ+6c81jhJ d7anFQbPh7MXEI4PA2DVVjQNSHokYmBhniv/yH3jY0uIKMGS95aWiFZ7Ne90lphGFO l3H7iVTSeROA7Yy1lvxoeHkMAd9+DCEjTKGA1PmdKYrDvgUwbMwCMzDlw13GZYDbAb 0+v2h/UWhZ1zjA32z/qtjWA2vXrava0BIz6mh78WjGjZBC9HCg8bdXJKNGbu190u4G 2MgyyP7UDE0YQ== From: Chuck Lever Date: Fri, 24 Apr 2026 21:53:04 -0400 Subject: [PATCH v11 02/15] fs: Add case sensitivity flags to file_kattr Precedence: bulk X-Mailing-List: linux-api@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260424-case-sensitivity-v11-2-de5619beddaf@oracle.com> References: <20260424-case-sensitivity-v11-0-de5619beddaf@oracle.com> In-Reply-To: <20260424-case-sensitivity-v11-0-de5619beddaf@oracle.com> To: Al Viro , Christian Brauner , Jan Kara Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-api@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, hirofumi@mail.parknet.co.jp, linkinjeon@kernel.org, sj1557.seo@samsung.com, yuezhang.mo@sony.com, almaz.alexandrovich@paragon-software.com, slava@dubeyko.com, glaubitz@physik.fu-berlin.de, frank.li@vivo.com, tytso@mit.edu, adilger.kernel@dilger.ca, cem@kernel.org, sfrench@samba.org, pc@manguebit.org, ronniesahlberg@gmail.com, sprasad@microsoft.com, trondmy@kernel.org, anna@kernel.org, jaegeuk@kernel.org, chao@kernel.org, hansg@kernel.org, senozhatsky@chromium.org, Chuck Lever , "Darrick J. Wong" , Roland Mainz X-Mailer: b4 0.16-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=3394; i=chuck.lever@oracle.com; h=from:subject:message-id; bh=42BtA/ECrX4U52i4InslT9hET7DZ27jCO0bDUKFKJW4=; b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp7B6QnCcLxEgVgqxUPTsyyPkPTGM1fwG8lYKAg sf1zpx+aSSJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCaewekAAKCRAzarMzb2Z/ l/qtEACCmS3MA/uOWQjFk94bJTW2Zo02V0sdsO47IYXAL+DmIVBmnacrvD2LJdNNMyIKdJgHtHQ GKb0TFBuvc3NiwOXlTkQZn5XVmKiYhiMzapxwOT+tMeeQvpUGmzW731Mp1BUwoNPyDJdW/5Kuul EGoiFMVzqBQnyBTx6u4EKz5pRGYZYg3q6DvmoLInvN/PbMjnQ6lhcekaXJY34iLQUqk9cF+Nc1y ocLCfH5KwM5Ez9EIr2H+jf3J5BBPh4+vXUkvpGCL01OzK2j3EOcubXFZoBsxeHAaTtH4C1D62bB e7y8i/cxDq9L1Q316+QHxnNU53WPxIKQwj+UFQIVIwY1px/hIehHn/sSS4dFVyV7ILoYWxliiPp gcps9ZU5bNVtk2C8ThjeatIhQGRiACG/J9FiOzgZnF+E/glef20kAf6ZuYzcuZ+cGcUye+RtS5a 92drAqIv90+Eo9mxYAxsDJqA+5f8N2W0vD1SdmyWYT+gXxG64CCULaJRH21bKfv9y/KP12lttW6 mnmTB3PqAhuN8VguGQrADzab2S0L1QZLn1KcBvHny3QtT478jXZ1cyMfVIPcsVKsYyJsxl1VE5W kRVecsPbDv6pwQ0u9AGsFDnPOfSbg+zpwYOegsYepLUqrbxITMTISc6uKfXD2uH2AYmzk8qzbEu I+a1rEar5hUbDsg== X-Developer-Key: i=chuck.lever@oracle.com; a=openpgp; fpr=28B2E5B01286DF243CF23EFE336AB3336F667F97 From: Chuck Lever Enable upper layers such as NFSD to retrieve case sensitivity information from file systems by adding FS_XFLAG_CASEFOLD and FS_XFLAG_CASENONPRESERVING flags. Filesystems report case-insensitive or case-nonpreserving behavior by setting these flags directly in fa->fsx_xflags. The default (flags unset) indicates POSIX semantics: case-sensitive and case-preserving. Both flags are added to FS_XFLAG_RDONLY_MASK so FS_IOC_FSSETXATTR silently strips them, keeping the new xflags strictly a reporting interface. Callers that want to toggle casefolding continue to use FS_IOC_SETFLAGS with FS_CASEFOLD_FL, the established UAPI on filesystems that support the operation (ext4 and f2fs on empty directories). Case sensitivity information is exported to userspace via the fa_xflags field in the FS_IOC_FSGETXATTR ioctl and file_getattr() system call. Reviewed-by: "Darrick J. Wong" Reviewed-by: Jan Kara Reviewed-by: Roland Mainz Signed-off-by: Chuck Lever --- fs/file_attr.c | 4 ++++ include/linux/fileattr.h | 3 ++- include/uapi/linux/fs.h | 7 +++++++ 3 files changed, 13 insertions(+), 1 deletion(-) diff --git a/fs/file_attr.c b/fs/file_attr.c index f429da66a317..bfb00d256dd5 100644 --- a/fs/file_attr.c +++ b/fs/file_attr.c @@ -37,6 +37,8 @@ void fileattr_fill_xflags(struct file_kattr *fa, u32 xflags) fa->flags |= FS_PROJINHERIT_FL; if (fa->fsx_xflags & FS_XFLAG_VERITY) fa->flags |= FS_VERITY_FL; + if (fa->fsx_xflags & FS_XFLAG_CASEFOLD) + fa->flags |= FS_CASEFOLD_FL; } EXPORT_SYMBOL(fileattr_fill_xflags); @@ -67,6 +69,8 @@ void fileattr_fill_flags(struct file_kattr *fa, u32 flags) fa->fsx_xflags |= FS_XFLAG_PROJINHERIT; if (fa->flags & FS_VERITY_FL) fa->fsx_xflags |= FS_XFLAG_VERITY; + if (fa->flags & FS_CASEFOLD_FL) + fa->fsx_xflags |= FS_XFLAG_CASEFOLD; } EXPORT_SYMBOL(fileattr_fill_flags); diff --git a/include/linux/fileattr.h b/include/linux/fileattr.h index 3780904a63a6..58044b598016 100644 --- a/include/linux/fileattr.h +++ b/include/linux/fileattr.h @@ -16,7 +16,8 @@ /* Read-only inode flags */ #define FS_XFLAG_RDONLY_MASK \ - (FS_XFLAG_PREALLOC | FS_XFLAG_HASATTR | FS_XFLAG_VERITY) + (FS_XFLAG_PREALLOC | FS_XFLAG_HASATTR | FS_XFLAG_VERITY | \ + FS_XFLAG_CASEFOLD | FS_XFLAG_CASENONPRESERVING) /* Flags to indicate valid value of fsx_ fields */ #define FS_XFLAG_VALUES_MASK \ diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 13f71202845e..2ea4c81df08f 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -254,6 +254,13 @@ struct file_attr { #define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */ #define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */ #define FS_XFLAG_VERITY 0x00020000 /* fs-verity enabled */ +/* + * Case handling flags (read-only, cannot be set via ioctl). + * Default (neither set) indicates POSIX semantics: case-sensitive + * lookups and case-preserving storage. + */ +#define FS_XFLAG_CASEFOLD 0x00040000 /* case-insensitive lookups */ +#define FS_XFLAG_CASENONPRESERVING 0x00080000 /* case not preserved */ #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ /* the read-only stuff doesn't really belong here, but any other place is -- 2.53.0