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 BE55F3ED12B; Thu, 23 Apr 2026 13:12:30 +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=1776949950; cv=none; b=pw79oImXgx6GgsfmDJAJM6bcFofCTtt8ORn+bKVHuCRKjiJmyQpYOFBTKe0AXmv4OiL2U8NneLqOobq77ows4kUvEsluJjI8FlmyMIv6pmjylRJSUXxXt+4/D3BHKYQz55PF3XzTTKXjjVFmMdpQRhn35esTwV7p4AAFy643yRk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776949950; c=relaxed/simple; bh=GBRThfl8AJdjIQY1hCpFaRdtjODXMDI8+pFJwoD6QKg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=u/CO+gXa3ccBn6x+MZbIjbrYr/aLi+1TGl3q3GXUWI4ACWIAPJsBgdOJIovB0QBD6iT1WhTAcP8UJuRarhrnLqxpTd3QMHXI+eGsQA/PqSLXKy0IZWFhGv+KJTjHcPiWL06PwkLi56lSJHuSIay3WH5yO4vfMljGmOKkrC1Pjzg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=W9vQKqa0; 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="W9vQKqa0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 55E32C2BCB4; Thu, 23 Apr 2026 13:12:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776949950; bh=GBRThfl8AJdjIQY1hCpFaRdtjODXMDI8+pFJwoD6QKg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=W9vQKqa0nGOsapVu7taHMUThskjH6lMOussU0W0x1SC1O9YkQUGpUUwXja8rSN48I TwK0A5mX73dlUuAowslo8MnRqxeGaGPL00NKfyISw18j0+ksFDk6nILM7fhh2F8D2E J1cBQ09B6cpv0KxeUtbo+Jnbciotr2F6pAPcJPGbFffPtGVS0yLyoX5cCwAuNb6W9E oVWdWQsG+tzAENnpBpig/UY+W0wc9yWFsfQ07pPb9N5MoaZ+DCA+cwPmQnwIrPy8WP WjLBNmOUu/SynhlD4oo/+fxgM0X5jyhtzhSqeB1VBeXYb8Ws23DXEEW2CaMbCKDUYZ cW9TkGOXp1+Rw== From: Chuck Lever Date: Thu, 23 Apr 2026 09:12:06 -0400 Subject: [PATCH v10 03/17] fat: Implement fileattr_get for case sensitivity Precedence: bulk X-Mailing-List: linux-fsdevel@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: <20260423-case-sensitivity-v10-3-c385d674a6cf@oracle.com> References: <20260423-case-sensitivity-v10-0-c385d674a6cf@oracle.com> In-Reply-To: <20260423-case-sensitivity-v10-0-c385d674a6cf@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 X-Mailer: b4 0.16-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=3856; i=chuck.lever@oracle.com; h=from:subject:message-id; bh=z0G26qNOK5JhmRz9M45By4F6NKvq8eKa6ZlbA0umD2I=; b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp6hqzhQ4CSX2BgNJWYYLNu38a9BCDxEokRi4Xl ykrZ4frVAiJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCaeoaswAKCRAzarMzb2Z/ lxTyD/9AFx9PEDAFHBJoF2p/hUJFYsfpPsY+fQSOYOQsvZHQWT02iVJ/Ps31IZocal19lZ6Ncwz GAlHBA5zy3e0k4UsVKDxnGrNIydJ6xjEgzW0zbPzIQszSAnMep56jmLfIcMPP8m1taBj+Zfelj9 nTr4v3bt44/UTLyudqklgnRfoKAIyNuPjlowtNv2DNW6F6sZD8TXOgOsw8tm1szWdS+SnUEe+jF Pg4QjpzGrGuIieYWxkfyPTGzrDAS1HFJHSpsG5ppT53lgLknvuEgoKlfraZ7nXGfXAQVuQ8Xnz2 Vv+vGhxI1PQQ6DWkSdQQLV14PfoVA3weiAPVK0e1djI7VEVChPy5KMWhhcDLtG1ViT1aLD+4Zz6 5jJGUGP76QqiKRQwNwIgRFGKIKHaMU8KcciPMrkiJQMMJ42OKI9xglRGXbU5Ruo++I6wjr5qer7 FUz1vurjswos2vPktcWMyh+txl/XDVTK8lWFReLdeWgZB21wiQoXHkcggzgcPdkIpMPvM04xDyn iWwn8WHwS3/sgl7pPyE8kIHawXuoczf7i/iYXwNHpHX5QdhJKyPE1GAIEwkAJsA6edpb0TGrOKA 1KMQnEV2XWxw4B3bQnZlO3bfIAf7tW7SPYHYj5xRfh5031POsCr2TiqgPIjkk3uczVwRgkj5jIo k7wp6gkaNgTtdgg== X-Developer-Key: i=chuck.lever@oracle.com; a=openpgp; fpr=28B2E5B01286DF243CF23EFE336AB3336F667F97 From: Chuck Lever Report FAT's case sensitivity behavior via the FS_XFLAG_CASEFOLD and FS_XFLAG_CASENONPRESERVING flags. FAT filesystems are case-insensitive by default. MSDOS supports a 'nocase' mount option that enables case-sensitive behavior; check this option when reporting case sensitivity. VFAT long filename entries preserve case; without VFAT, only uppercased 8.3 short names are stored. MSDOS with 'nocase' also preserves case since the name-formatting code skips upcasing when 'nocase' is set. Check both options when reporting case preservation. Reviewed-by: Jan Kara Signed-off-by: Chuck Lever --- fs/fat/fat.h | 3 +++ fs/fat/file.c | 23 +++++++++++++++++++++++ fs/fat/namei_msdos.c | 1 + fs/fat/namei_vfat.c | 1 + 4 files changed, 28 insertions(+) diff --git a/fs/fat/fat.h b/fs/fat/fat.h index 5a58f0bf8ce8..99ed9228a677 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -10,6 +10,8 @@ #include #include +struct file_kattr; + /* * vfat shortname flags */ @@ -408,6 +410,7 @@ extern void fat_truncate_blocks(struct inode *inode, loff_t offset); extern int fat_getattr(struct mnt_idmap *idmap, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int flags); +int fat_fileattr_get(struct dentry *dentry, struct file_kattr *fa); extern int fat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); diff --git a/fs/fat/file.c b/fs/fat/file.c index becccdd2e501..34d8588fcd3f 100644 --- a/fs/fat/file.c +++ b/fs/fat/file.c @@ -17,6 +17,7 @@ #include #include #include +#include #include "fat.h" static long fat_fallocate(struct file *file, int mode, @@ -398,6 +399,27 @@ void fat_truncate_blocks(struct inode *inode, loff_t offset) fat_flush_inodes(inode->i_sb, inode, NULL); } +int fat_fileattr_get(struct dentry *dentry, struct file_kattr *fa) +{ + struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb); + + /* + * FAT filesystems are case-insensitive by default. MSDOS + * supports a 'nocase' mount option for case-sensitive behavior. + * + * VFAT long filename entries preserve case. Without VFAT, only + * uppercased 8.3 short names are stored. MSDOS with 'nocase' + * also preserves case. + */ + if (!sbi->options.nocase) { + fa->fsx_xflags |= FS_XFLAG_CASEFOLD; + if (!sbi->options.isvfat) + fa->fsx_xflags |= FS_XFLAG_CASENONPRESERVING; + } + return 0; +} +EXPORT_SYMBOL_GPL(fat_fileattr_get); + int fat_getattr(struct mnt_idmap *idmap, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int flags) { @@ -575,5 +597,6 @@ EXPORT_SYMBOL_GPL(fat_setattr); const struct inode_operations fat_file_inode_operations = { .setattr = fat_setattr, .getattr = fat_getattr, + .fileattr_get = fat_fileattr_get, .update_time = fat_update_time, }; diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c index 4cc65f330fb7..0fd2971ad4b1 100644 --- a/fs/fat/namei_msdos.c +++ b/fs/fat/namei_msdos.c @@ -644,6 +644,7 @@ static const struct inode_operations msdos_dir_inode_operations = { .rename = msdos_rename, .setattr = fat_setattr, .getattr = fat_getattr, + .fileattr_get = fat_fileattr_get, .update_time = fat_update_time, }; diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c index 918b3756674c..e909447873e3 100644 --- a/fs/fat/namei_vfat.c +++ b/fs/fat/namei_vfat.c @@ -1185,6 +1185,7 @@ static const struct inode_operations vfat_dir_inode_operations = { .rename = vfat_rename2, .setattr = fat_setattr, .getattr = fat_getattr, + .fileattr_get = fat_fileattr_get, .update_time = fat_update_time, }; -- 2.53.0