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 40E3232C924; Wed, 22 Apr 2026 23:30:22 +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=1776900622; cv=none; b=PbNuqVmWlNs6E3Qi2tT6NVYk6f4VbAnFlsqCbemtsrfvjSfHIfEIhmD5t+XcratJwQfizSYlxCjyMNp+9hPymRz7KS+sf7s5nIxfRkmIrFSI825nBSblzLKVIVN7GbsPmnshquc2b8cxYWTZ6iEGABSSKnp/oXwk2bKM3x6XSJg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776900622; c=relaxed/simple; bh=uytnG4T41lmij4usJJKWFHkDGf7l9bOy8F5b+Jr0Bz8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=YoId8W7pVepkx1Z4zEJLTToDc5xBGXgPOEul1f4sy6MxfjPYyadgZtksiLoqL77nnJZ1tTgSP0cObfQlVJWhhjQ1MKT71m77wRRNRmcA/qlLfOcltp9tk3elT2hFPq1ddHBWZXAbM2xyXV65uNvkf/NQJLvON6/VAl+RcsVH7z8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ngex4nC0; 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="ngex4nC0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8B25C19425; Wed, 22 Apr 2026 23:30:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776900622; bh=uytnG4T41lmij4usJJKWFHkDGf7l9bOy8F5b+Jr0Bz8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ngex4nC0VVrNAo5mw+72SuWXiDcV74tTuNdtVOwaDfEbcNRwf9gNdBNUg3v5BdmNt j1X83Pro3ZJBaPBP2/t43CauNjGcLGCMqfvjGMB/1t8Cu9L56KFREx7YBarEuFASo+ KH9xqh3X6g5SeR77yZ20bQ2PhVnCK/Jl7NnoXELn4mZuuLmevcUEuZd283k+16jvU5 ZYFxhTxpGubkcaY7lQbhpm4hSblmakq8t0eAkkSFhBF/71U4nT3WS0hgUPRzNiacwB iwy5YPxVMX09+PhoeDMmHs8p6AIvg5vgoYNqBwXIAidL72ne84/vQZweQPVtm1Iz2b N00H+eeqqKYqQ== From: Chuck Lever Date: Wed, 22 Apr 2026 19:29:56 -0400 Subject: [PATCH v9 02/17] fs: Add case sensitivity flags to file_kattr Precedence: bulk X-Mailing-List: linux-xfs@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: <20260422-case-sensitivity-v9-2-be023cc070e2@oracle.com> References: <20260422-case-sensitivity-v9-0-be023cc070e2@oracle.com> In-Reply-To: <20260422-case-sensitivity-v9-0-be023cc070e2@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" X-Mailer: b4 0.16-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=3063; i=chuck.lever@oracle.com; h=from:subject:message-id; bh=sEgEaAVKkk3OcJq+fmpgufZDvvVtq2OzcLqvqCXcHKQ=; b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp6VoFS16vtgH3TX9/MlKIt0UPwe9oTupY7K4XZ FKcQg0AtR+JAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCaelaBQAKCRAzarMzb2Z/ l/dGEACO5DxHKVVVOf2qk2IsxSXIeTaH2XRX84xMfJeZ63ZrvUUXoVF+G+OtN+NDWg4m9WswVuC VbEHnm93dBdgWUtHFd9R3A1uo679Nn2FV+1iObWn6yuWcPlWF1+FJV3n6nOne6U/c5B8x7BtOSY yqwei18I4bgVgJ0oHmwo3XJdPQgfboTZVI/u+9E4P7eBxvZD/Tk3/43trbvBnrBiCO1GUFRc+w9 yU7KdGz2aEYEsn9Wlm+CSc+FtR9qhBj3U1cxf+YtJ1EupPF6suBR97duPzNKbfPrbjqYjGIJyrb XL3osbDPb+xUmUkc6lQEtJBJriwowZOejHW5SWFlDC/1P6U11U+NyTAr7ona3S5hKim2QxuvJPo x2DaNO3BsC1pTs7138R+/aJM4z6ToDRfZMP6KqAhQcDce4VIDmjnsyM4oe+7OuBgl2h2jTv118D kMnS1PxbAvHYNcN/lHkJxhLwFA4RgJ/THdEfmf7vOfS0OquBUVKf6O36Pjv6GOvCRUjM9MuSyex EBRb4LsKoOUhCgcj6vNOSH8yoNQvNAQSDFqlk1J1G63bj5DYo+SdOWbJq41FwF01O/IoHtFrLJe 8Y5fk+NNHWvCN3SQWXrY26QoMC6/ATimUztTTgu6pmcHx0WfRYhnSnP6DPbA9NeILmlScSir2ot oFUnpfyWCrmsAoQ== 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. These flags are read-only; userspace cannot set them via ioctl. 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 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