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 D31A0393DF5; Fri, 16 Jan 2026 14:46:25 +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=1768574785; cv=none; b=Q4hWCx1+2LAxcwh6lbi2bLHG3ef7+IoNCqTcgzHJpG/mySMBhQ+N2tnrq6RyMpJb9hHhF/9Kj/0WTJtrSoZ1WVMMO5wzAkqaa47sxwCsSfkQWGQ28cOA6WRBtXBuiCm7tebVB4gbmxHwGYwZ3rOPL3xJK4hZwg4vTD/SNH9rpPU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768574785; c=relaxed/simple; bh=CahDPDzZYIbDfyKQFxk+s6xASrRGrfEnbYUaLgq1CUA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bMxuz3ZYh+BhVfhWNZ4pP1uiogCKT+rDHCNcEMXEw66t/Ubj5mAQRwEUwLHnBsoZn2d2Pxv6OjdMCboGLrmg0ACtVYPY67faEmioE3iYdHY67YT1ixknTTq8PfxNO0PAllOhijoCHQTvoiqwdM1ijCEon8qQwVi8NcQofdrQyvw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=miE79lnO; 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="miE79lnO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4F758C19421; Fri, 16 Jan 2026 14:46:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768574785; bh=CahDPDzZYIbDfyKQFxk+s6xASrRGrfEnbYUaLgq1CUA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=miE79lnOelxvspRAXw7YXJq2w4XoApX4MHNp3HohtjxIY0wqIq60k3sBqjVKPeDGy NM1FcmwgxHDdfdJUzw8clFkbS9VKtSbguGLOT1gVKz9lu1btmlVfpSIbY7KiJKKHXi QIkzF3v/Bb1TSuKG1UaA/q8V8eZTuekffaTcQKK1vjTa7cUTS22v010lwhbdp2CxhN E+mVxBUcVTOEciIhLXi//L3abioMH+sF8DbL/wwakPiswf65cC5UvFXCMvF20AwFTJ 8dN/p5jk4BTjT2KNSRlopRw8qIi9u63+6orNN9+YBu3zGwyRYjuoVlTAKz7wSuS23z B2iZsAELRE0tQ== 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 02/16] fat: Implement fileattr_get for case sensitivity Date: Fri, 16 Jan 2026 09:46:01 -0500 Message-ID: <20260116144616.2098618-3-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 Report FAT's case sensitivity behavior via the file_kattr boolean fields. 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. Signed-off-by: Chuck Lever --- fs/fat/fat.h | 3 +++ fs/fat/file.c | 20 ++++++++++++++++++++ fs/fat/namei_msdos.c | 1 + fs/fat/namei_vfat.c | 1 + 4 files changed, 25 insertions(+) diff --git a/fs/fat/fat.h b/fs/fat/fat.h index d3e426de5f01..9e208eeb46c4 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); +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..328f9e3c9fa3 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 +396,24 @@ 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. + */ + fa->case_insensitive = !sbi->options.nocase; + fa->case_nonpreserving = !sbi->options.isvfat && !sbi->options.nocase; + 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 +593,6 @@ 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