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 A1F0A41B346; Wed, 29 Apr 2026 18:07:36 +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=1777486056; cv=none; b=UakqxwQBb+KljJt3twuOePUoE7AHoCKLGlyAC4W2LxUtAyt0dhRUXQVvLdfuebJ2nBogmX4bVwrk4zwc9KQDieGV8EEGxXuA4YRDl3/Uz6pX7cdkD+UuKx9NCjg0gCN7iTLlsmG2fjRjzz8AnnY8E2tSVWxfc3e3oD4eUHtZCEQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777486056; c=relaxed/simple; bh=VR5IPc+tFJzycK0UcE5Jbwk0EDkpbGyJE15n77IJHGE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=hQ13GO/aapAWDYJua4AbFPIruebJ4hu/z6ONPyWX1j5Y06SjOE+Fb10K+5sPa3XYMvynzGR7k+qTFpCMM+N0Eb5PzoC60TxYV6+0yv7Hg7ViSEha0ft5lrak00hzFfj+1ystsaDTWQOm/61e3Zlk6mIV3qfuHPtER/fVI2+NnWo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fqvkr/DS; 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="fqvkr/DS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB594C2BCC7; Wed, 29 Apr 2026 18:07:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777486055; bh=VR5IPc+tFJzycK0UcE5Jbwk0EDkpbGyJE15n77IJHGE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=fqvkr/DST3jD/7fw1tlcvwOZ/XxcHM6PprzyY4iezB7kORBU8yt6qrmr41qOuqx5U VYERiscNdbCOYMe25//zlyvqanRlr109lLOAQCk8Ay6ElGZvNNerMPwL1JSPmXsreL e47ByeMAJPB2o4MTAq6NL67754wu+X6XyjaytkeTYIwzXs2KLdhms7TD8+5goXt8d/ Y7+YIGS9boZyIhh4RAN6iTwWXhu6UZcaCVD2li9rEDwUqkL0ij5kVTWkfp0C77DhWO EbByP9ckuu0DSx27r8C0jhPUQa0Nuq1PoySrxy1HSGrSbKg1OngeChKzxPc7v07X70 vjl+nM2Nh1vnA== From: Chuck Lever Date: Wed, 29 Apr 2026 14:07:14 -0400 Subject: [PATCH v12 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: <20260429-case-sensitivity-v12-3-8057123bebe0@oracle.com> References: <20260429-case-sensitivity-v12-0-8057123bebe0@oracle.com> In-Reply-To: <20260429-case-sensitivity-v12-0-8057123bebe0@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+XAcsmYgBp8kjcTH8J2NaTirzJ3PCQEELPXpwok/uo9HTkY ZDI8Op6AZeJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCafJI3AAKCRAzarMzb2Z/ l1NFD/9zJRAe2C9NP8WNU4BB6obmcVygcAwzy4rnfRT5QTtFUxPH5zrLxLfDe2d1CeCyDmFJ/v6 NESCp6VYJTq2L7ke8sS+8YACItdyOWkrf9QZ41eDbabwXFDHW6T5/uFiR6ghEXfNtGkJ3lnkiRO oOB/Pukd3RDNjbBj9dcokoSjfoXdpJDw+wBaFQ4kOvMIwp7gKEzd/MvfFn7ViQlsTMUbNLwWdg5 AJLbV7BdF+skB321MkPIBM+R70TP38lU/B7VMA5TTaYstQ1WhAEhySed9Cn5MoXNGCZnfeJuyEL VPI7DUfh2FGUZyZm8wu7R4/OvJ/bGmOgsqFUKL0vkftVxRC8aXzd8YTl0qBvkIfzceVaslAMmdJ HCmElBS8tD66LV4AZP3qNnIFsMRLaxROWQUYmN/3kGDNBu32mZWB9EmibSD5fEjmkppdcF13Ocm +1wPvrG0nONy+qpzbEGCG62c3b9/J6Mu5Br1/Q1PJ1+hMmvA2jqrhLD4oiQgokXZ90ToCdNYehs u5kZcCEk/hYln+EmgmJTzBReTnx5xCfphlV3khF7+GXxpsqhBGs+t9pMYk70GC6g3yQac2GKK/E Rj7aHrqTkEBr4YHpb8bfMkgrGHrmr60xWlPeoU+jf4WjGjw6NHD1Pz44JYJchCB98zZwgLkw+8o d9S4wY2DoLZgT5Q== 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