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 6F2ED30C375; Thu, 11 Dec 2025 15:21:54 +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=1765466514; cv=none; b=sN2E4k4xMQhukV2Sp2QQrf+2c0YYp+ZQIpRU5Wmu0F5WRvQDV864bQRQX3ZfjiSIifpPlhfcD54hMpbUF9CtaPWckMoPF3K/ztSjQWSXXVsHq9lKMj+dK3l+jHQiEwEXpCrquKTb8rEjn5Zt/zJXTv0Bz1nPiqBoeNAsmjykp7g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765466514; c=relaxed/simple; bh=K1wmSwwV16UCXsb+WMuc89ImO4HAvc1BlSZXGBLXsJI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=X1LeDCXA3QfoVP/+SVXZcqxfYDzEoI/Ge0aedP8z6l1Tc7qMyG7B5F7PqKwNBajwOr0a+o+wOPFQ+nRKGRsLOl0bdoNm8jP6/TKDulDYgd32laVKF7IcKF806yF11X+8l4Ie+B2HO7FF1vplprI3a15rdiFwbQbmoWxv0LfGyNI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pV8/8K1O; 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="pV8/8K1O" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 47EDFC113D0; Thu, 11 Dec 2025 15:21:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1765466514; bh=K1wmSwwV16UCXsb+WMuc89ImO4HAvc1BlSZXGBLXsJI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pV8/8K1Og3qagDhBNXc30nTBODvLIkbwkXBr7rnTBqFxf8VExwjg6xSt6fhHlUHz6 7+pArY4cDEvTXcPic7jBgNrcESwmmBp2/ex4nEYisoValbTusRIcsOO7/tVVM91RrW K0DzyodDCq4IumgbrBXCPAgbQRMVTdtyGIzR5ikdMofYhy+CNo1dta5pPb5gPfR7Un 7xg7lWMZeYkO0EPQiWRrjHdcVXn26EMMV9UZJgYS43uzDQ2tUpipKgFsxEh3YGUjWH fk/OeigJQhTjwrL/xU2V/UExbjzjtG0CymxTr1M7AZrIp+qwPDdVcCvKjCv1BLP/iZ MLiphy9qs+qwg== 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 2/6] fat: Implement fileattr_get for case sensitivity Date: Thu, 11 Dec 2025 10:21:12 -0500 Message-ID: <20251211152116.480799-3-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 FAT's case sensitivity behavior via the new file_kattr case_info field. FAT filesystems are case-insensitive and do not preserve case at rest (stored names are uppercased). The case folding type depends on the mount options: when utf8 is enabled, Unicode case folding is used; otherwise ASCII case folding. Signed-off-by: Chuck Lever --- fs/fat/fat.h | 3 +++ fs/fat/file.c | 18 ++++++++++++++++++ fs/fat/namei_msdos.c | 1 + fs/fat/namei_vfat.c | 1 + 4 files changed, 23 insertions(+) diff --git a/fs/fat/fat.h b/fs/fat/fat.h index d3e426de5f01..38da08d8fec4 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -10,6 +10,8 @@ #include #include +struct file_kattr; + /* * vfat shortname flags */ @@ -407,6 +409,7 @@ 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); +extern 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 4fc49a614fb8..123f4c1efdf4 100644 --- a/fs/fat/file.c +++ b/fs/fat/file.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "fat.h" static long fat_fallocate(struct file *file, int mode, @@ -395,6 +396,22 @@ 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 inode *inode = d_inode(dentry); + struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); + + /* + * FAT filesystems do not preserve case: stored names are + * uppercased. They are case-insensitive, using either ASCII + * or Unicode comparison depending on mount options. + */ + fa->case_info = sbi->options.utf8 ? + FILEATTR_CASEFOLD_UNICODE : FILEATTR_CASEFOLD_ASCII; + 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) { @@ -574,5 +591,6 @@ 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 0b920ee40a7f..380add5c6c66 100644 --- a/fs/fat/namei_msdos.c +++ b/fs/fat/namei_msdos.c @@ -640,6 +640,7 @@ 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 5dbc4cbb8fce..6cf513f97afa 100644 --- a/fs/fat/namei_vfat.c +++ b/fs/fat/namei_vfat.c @@ -1180,6 +1180,7 @@ 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, }; -- 2.52.0