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 6CE4123D2B2; Fri, 16 Jan 2026 14:46:23 +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=1768574783; cv=none; b=hSpK0529vBHWtqd0R6pJb+tcl5RsudNEwlxlEXmDr7CbYo8oi/TZnoxDeTGcaHiYjUg7boAVSVm+LarJMKrUpYufxj+d/sduWBtCmLPfxWOx97AO5oAvMD1asqkT5nTlDmet2/G/SmU0flh94KY0B763KH3Ux81VzzTJLOKgSn4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768574783; c=relaxed/simple; bh=a661ni48mgSpevVv8uV64JVotuwrk9w+dgDbRx0EyxI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e0/wbKmMiO4Pesi+5p/PWfupbd23ZysSgL/5Kf0yuIOrd/isbxqtnM42LPE3Tw8skOATENynyVfV67LSbihDaFtNtjN650QfPpBiMOdmKh27lpDJJ7lCV1y+6BryVBeicYf9vThyTBkzQM+y9Ylq6uJnSRRVC0dYflMbSIC6nHM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZWRg71n+; 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="ZWRg71n+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E496EC19425; Fri, 16 Jan 2026 14:46:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768574783; bh=a661ni48mgSpevVv8uV64JVotuwrk9w+dgDbRx0EyxI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZWRg71n+tKCudxlH674opbuV6KLPb1NgCP1VNATBFwFTxONYJHuezZIz0+e4wdvMd hbpQLm7xtSjuodkx6bEAr5wfTgYScpUyqMvxUX+mK2c/LMQB0mzpgiCkNRmFtk+rfZ RL9nqWksOEn89ztZCnfOs1wvv5dsrIFa+V1iskdnClEpd+UrLwqIVEkP8k3WtrUe+l OJy170J4hCG/zmYGp+LrODiUE0PX54luFgAVHx4u7ZMXln5WKxGMn/YVwHQfIP+NoE Og+cw08Wc7hnCgQs8sPXHvUUYYFInHYeBUmeyqYmHh6f3itNkX1wAGbNpCwthsQavv yM3aHwHkotPuA== From: Chuck Lever To: Al Viro , Christian Brauner , Jan Kara Cc: , linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-cifs@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 Subject: [PATCH v5 01/16] fs: Add case sensitivity info to file_kattr Date: Fri, 16 Jan 2026 09:46:00 -0500 Message-ID: <20260116144616.2098618-2-cel@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260116144616.2098618-1-cel@kernel.org> References: <20260116144616.2098618-1-cel@kernel.org> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chuck Lever Enable upper layers such as NFSD to retrieve case sensitivity information from file systems by adding case_insensitive and case_nonpreserving boolean fields to struct file_kattr. The case_insensitive and case_nonpreserving fields in struct file_kattr default to false (POSIX semantics: case-sensitive and case-preserving), allowing filesystems to set them only when behavior differs from the default. Case sensitivity information is exported to userspace via the existing fa_xflags field using the new FS_XFLAG_CASEFOLD and FS_XFLAG_CASENONPRESERVING flags. Signed-off-by: Chuck Lever --- fs/file_attr.c | 6 ++++++ include/linux/fileattr.h | 6 +++++- include/uapi/linux/fs.h | 2 ++ 3 files changed, 13 insertions(+), 1 deletion(-) diff --git a/fs/file_attr.c b/fs/file_attr.c index 13cdb31a3e94..2f83f3c6a170 100644 --- a/fs/file_attr.c +++ b/fs/file_attr.c @@ -84,6 +84,8 @@ int vfs_fileattr_get(struct dentry *dentry, struct file_kattr *fa) struct inode *inode = d_inode(dentry); int error; + memset(fa, 0, sizeof(*fa)); + if (!inode->i_op->fileattr_get) return -ENOIOCTLCMD; @@ -106,6 +108,10 @@ static void fileattr_to_file_attr(const struct file_kattr *fa, fattr->fa_nextents = fa->fsx_nextents; fattr->fa_projid = fa->fsx_projid; fattr->fa_cowextsize = fa->fsx_cowextsize; + if (fa->case_insensitive) + fattr->fa_xflags |= FS_XFLAG_CASEFOLD; + if (fa->case_nonpreserving) + fattr->fa_xflags |= FS_XFLAG_CASENONPRESERVING; } /** diff --git a/include/linux/fileattr.h b/include/linux/fileattr.h index f89dcfad3f8f..7f2e557255ce 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_PREALLOC | FS_XFLAG_HASATTR | \ + FS_XFLAG_CASEFOLD | FS_XFLAG_CASENONPRESERVING) /* Flags to indicate valid value of fsx_ fields */ #define FS_XFLAG_VALUES_MASK \ @@ -51,6 +52,9 @@ struct file_kattr { /* selectors: */ bool flags_valid:1; bool fsx_valid:1; + /* case sensitivity behavior: */ + bool case_insensitive:1; + bool case_nonpreserving:1; }; int copy_fsxattr_to_user(const struct file_kattr *fa, struct fsxattr __user *ufa); diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 66ca526cf786..919148beaa8c 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -253,6 +253,8 @@ struct file_attr { #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ #define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */ #define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */ +#define FS_XFLAG_CASEFOLD 0x00020000 /* case-insensitive lookups */ +#define FS_XFLAG_CASENONPRESERVING 0x00040000 /* 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 -- 2.52.0