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 9CA543909A2; Wed, 22 Apr 2026 23:30:24 +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=1776900624; cv=none; b=ARk0xymq3Ami/5I5YKWT8EqTRSAffyh3FaEx55+KVC8vHd1gUiNBnFB/5vZWolwONkEAfhfJHwDy1nCh8ELbdvyxFCZskYyxC8GaVFRZeotA4WJ+728r9+YzZGmxNiqn4ETptVj6yZhnZ3YM42r8Bmj9OqPL9AwB4iv2CD2joxo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776900624; c=relaxed/simple; bh=GBRThfl8AJdjIQY1hCpFaRdtjODXMDI8+pFJwoD6QKg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=MlWg4vdWmKWSi6e1/kXOmy3IrWlg0Oq4WvjOS2Af0fSa+w3PFr0HNZSOxZ7bEGBeYepDSRBKkOiJtIczF3ZGSjyygg5Ie4sFxpzYDHZWCKIQ5V5E7PHs1kEz0vZ6FxHQP0YZXtko3EkA11WmfkdfW09NRd24Ij3oN2DGGNTuslc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=k4tE+CtT; 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="k4tE+CtT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E6FDC2BCAF; Wed, 22 Apr 2026 23:30:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776900624; bh=GBRThfl8AJdjIQY1hCpFaRdtjODXMDI8+pFJwoD6QKg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=k4tE+CtTCy91lH1KLjuk7dfQpj6x+CJYPTK6VM3JdAzb2vo+y/AHucgF/7TO2nrwC PFIqQSVrVcPTzjKI0WXiEgAudH1Ls3taP7YsEaruiOD+gHa7QWmZQA4VwVMSbyTv3e dgalGd0/+90yVhyns0efRHSGZyQYaxn4mwDEpL2MQHNUcAw1QHtnkBfSb881RrXNc5 G8R7n8EYvehqtnQ7Ppn6B0zTLVs8HyS81fb7UwyBiUZfcCoO2sm+5VtczdxqG57B2/ N19U3BqnNXvgq8/O5TI4SpgsFJsRlXhST7xmb4rH/iP3AsLZJg3JMRRX1rvG2t83Le 9YdrQYSLHOQwQ== From: Chuck Lever Date: Wed, 22 Apr 2026 19:29:57 -0400 Subject: [PATCH v9 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: <20260422-case-sensitivity-v9-3-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 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+XAcsmYgBp6VoFLiiW56L89RUwmlQ1soliZZq/DIsmpLKff +1C1pI+Xv2JAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCaelaBQAKCRAzarMzb2Z/ lxikD/4hV6I9M/Jf/EZpJ7Rimh/r1H4+EuXqE0e13+FCtxToJagCMUfLVT5Tu6XJiukLE+qRVON PJ0TnIaJb5uH7KoYv7lIDR48gJHnByI2naajmjIyPpWn9sFrjAZbsqxN0NGX8YEIyaINMuLgO6M hvLO6BPGo1OSYLCOkE03yLxwcZYA0Yq/FEwzpME1YidTJI3SeRaDaqoVT4wR8ljZUR586OurMc3 TNAi/vUqyl5buBLS2PoSzCYld0vmZ041CnswPJs+QeiaStllhlpyAbfksawWItng9NuxHMj5+Af 8CJ4OssG9/xdvKZmtTVWRr4U74BBqIsy78plQOwEPkdZKQc/Ky5Hai20Zlr8WyPYnvxi/O6GDUm hwtK7kLW87zDFT29P5h0M1aO719mSkbZKqpJsi8eRdM6v1USMzl0YJEEmb0Z6ztI+eTj05lwszc mXlbcs4cmLhg50qy+ipQBcJ5JCqca/WoTBqIADQ3tNTfBYTiAF9RWDiV5NeOgp7WlmfuYAplZXl oa1RcobsoKkMfP0I2UwNP2mXM8rm1bSad+oGyjIuNDXQ1GTDHGR5XnQXXNva7wpGv1eqrjk2efY 94ziO6VTPWSjlE6jhCHO81/8RkRx7cLM1U155965kwZSO/qP1nIijYP3NLwcfs4cEwyDsaaYZsG PsSVmFmotp0IkIg== 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