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 36AB42820AC; Sat, 2 May 2026 14:21:29 +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=1777731690; cv=none; b=tlR+upqDIDCEO9Gdcnt7qa/w0hNsw1Ek7QjEtXkZqhlhdBB9+pEcIuDtUSj2AAVyEZa7zGxmKGCSdX2i5DQ09lCjpt/QgXCI4naRn7dwOSD0gw9Cfnx8cOWM2FNdayacJ/AgDQIj+4s+JtsAGkVMExQpTU8lSegmUJFyyInk1NU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777731690; c=relaxed/simple; bh=VR5IPc+tFJzycK0UcE5Jbwk0EDkpbGyJE15n77IJHGE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ubCJNT+3fPeWdZM2ocEbEg48CckX6UXYhMbdAnsoxukhVPs862K48ZYDGoYw1EfmIg/xyZ2sta5ZS/XBKD9RH1dPd1+lWmvUaxBNtOu9v4ocmza+4uZTN18oX4bi+hqL7EI2B9hufqhtoDzRj6gEIXvECo6cQfKMjHn9CtYRvek= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mF7HURzM; 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="mF7HURzM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 80B94C2BCB3; Sat, 2 May 2026 14:21:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777731689; bh=VR5IPc+tFJzycK0UcE5Jbwk0EDkpbGyJE15n77IJHGE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=mF7HURzMVcc76AIdcJ4gN+EjOH3PvQ+JAuxCubIcHZ3DqTATPTmSOPz/jj0c5a8eD 28ZXs+L6pe/biOR5DUyWkJHPJDw5dleKQ/IRG0xh1H5xyiuhhLw3v4NcwXJX/tNmPl slpIdOSJ4IBOx6SCzJ67PwcS8rkOVM4CDrlRuUhzIXbtan473DhGspkciBPe0VevA6 Rp2ocOlWAHkGCdsO0j9rfVlgh+qZXcwWH5E8UI5KU1WwF5OW0XNdX1C6+y6HCJAWle 4bcHP6g4kfp77H3pKtZwKEQurPLu3aTximYGPcgJm6eEg/e7hAw1UNnz826iFUl/eL q1+/gmUdmiL+A== From: Chuck Lever Date: Sat, 02 May 2026 10:20:48 -0400 Subject: [PATCH v13 03/15] fat: Implement fileattr_get for case sensitivity Precedence: bulk X-Mailing-List: linux-ext4@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: <20260502-case-sensitivity-v13-3-aa853140311f@oracle.com> References: <20260502-case-sensitivity-v13-0-aa853140311f@oracle.com> In-Reply-To: <20260502-case-sensitivity-v13-0-aa853140311f@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 , Roland Mainz X-Mailer: b4 0.16-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=4362; i=chuck.lever@oracle.com; h=from:subject:message-id; bh=9b+u/mWoEz9peMeExQH28HkC0yIPxzHosHi0xcms5fc=; b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp9ghQ1BYK25WvfFyqzaHIDtV9hFSfc8aMAu7+E /AjIghIsY2JAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCafYIUAAKCRAzarMzb2Z/ l+sCEACEwFRDD4cEH+PMA/LESHjhccu/7sgZ/W4dO0ReHcgG6q8I3VlIBGNwySJb3aQT6tPBR2P 3fEALKs5vj4BcjwnQ/T7wi6mwonrIzt3/H+9ZpBO4ICDfo4eylvEsjK07IBWs6+VZrJSZM50aPO LCpBxPaF/SjqIgV5o3ECVcsngrUolIDiKCFzdZQZ7RQhKwwL62FAkCtT/F4VZK0MlnxVbmeafts i9IBGfkvqLlctMiKC8hRY8VkgQHfePgcxnt5Ls/dSqBQIayK1VGzji8MNrHvBQzltvnpG3JX9Ng 3d7SaNtBapC50AQ6O5E8D50xh3kD3/Q0Ug2WBke9rBQ1lujCwg+QLZrgBf8f9lGnCd1A5yuGuco kkWs7v7kK6Fkpptrz+W5oPDX5UZOv+sZY3trZiulaarYUDRjAnAU5eMnMZk4iD9avtCfSOu/t4M XDrmv8f9YTg829LpDEHZjaT7yjoax6U8UgWHZCuxo/Eh82T/uWHhqFBYmtnEpm8e5zzDlOYGVtV vLmTYoVy/zHK6VRD9YxUUgOMzcqBDdBwXp7Q/ftJiYg9aZoeOt+vX/FaauCtnkig073tY56kXP6 eqxS31rR+BIHroVbUd7CHiXnToOhHWg25QOt1V9rfqvGyxziWOIrLyNKY8ExwBn9mYFIPwvAgNY 9+K8ozD0F9oABqw== 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 Reviewed-by: Roland Mainz Signed-off-by: Chuck Lever --- fs/fat/fat.h | 3 +++ fs/fat/file.c | 36 ++++++++++++++++++++++++++++++++++++ fs/fat/namei_msdos.c | 1 + fs/fat/namei_vfat.c | 1 + 4 files changed, 41 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..37e7049b4c8c 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 +399,40 @@ 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); + bool case_sensitive; + + /* + * FAT filesystems are case-insensitive by default. VFAT + * becomes case-sensitive when mounted with 'check=strict', + * which installs vfat_dentry_ops. MSDOS has no such option; + * its 'nocase' mount option selects case-sensitive matching. + * + * 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.isvfat) + case_sensitive = sbi->options.name_check == 's'; + else + case_sensitive = sbi->options.nocase; + + if (!case_sensitive) { + fa->fsx_xflags |= FS_XFLAG_CASEFOLD; + fa->flags |= FS_CASEFOLD_FL; + if (!sbi->options.isvfat) + fa->fsx_xflags |= FS_XFLAG_CASENONPRESERVING; + } + if (d_inode(dentry)->i_flags & S_IMMUTABLE) { + fa->fsx_xflags |= FS_XFLAG_IMMUTABLE; + fa->flags |= FS_IMMUTABLE_FL; + } + 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 +610,6 @@ 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