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Thu, 22 Jan 2026 16:03:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C872C116D0; Thu, 22 Jan 2026 16:03:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769097800; bh=cxtJNAeSQKGXjqyOc09KIaYvIy6k5g4qI83f/hE6lRw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ky9AJ0scI3jUCiPmq4BWLuqdZEkK6Y5Fe9ZOT4eVW6hf6UcAuNlEszxt50vuBVCq2 Rq37lSiveWiAT7ZF9+x3KOTt17ADzUrb0VYxUQ4SOWyWI6KQkElUvqMjOpE6Avg8lE yvLrcVabihJgBOraPl/g0dlS2uGfkf2Ab82qDbpKGxSFaEgxSmdkmz64VsORYyqI9a HhaoWhqMT6ZaAY8UX6fHVyJIdLv4zoOwp5sPDcVcWcbx7lYxBdPcNUnnAhUe/opZAs cnh66Y2gZq6psuUMJTjwyeI1+4ZRd3qSh14u0q/fZRORrvTboUypT+wawACr9RYSAJ al+Mq183jWpig== To: Al Viro , Christian Brauner , Jan Kara Date: Thu, 22 Jan 2026 11:02:57 -0500 Message-ID: <20260122160311.1117669-3-cel@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260122160311.1117669-1-cel@kernel.org> References: <20260122160311.1117669-1-cel@kernel.org> MIME-Version: 1.0 X-Headers-End: 1vix9a-0000Ub-Nb Subject: [f2fs-dev] [PATCH v7 02/16] fat: Implement fileattr_get for case sensitivity X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Chuck Lever via Linux-f2fs-devel Reply-To: Chuck Lever Cc: pc@manguebit.org, yuezhang.mo@sony.com, cem@kernel.org, almaz.alexandrovich@paragon-software.com, adilger.kernel@dilger.ca, linux-cifs@vger.kernel.org, sfrench@samba.org, slava@dubeyko.com, linux-ext4@vger.kernel.org, linkinjeon@kernel.org, sprasad@microsoft.com, frank.li@vivo.com, ronniesahlberg@gmail.com, glaubitz@physik.fu-berlin.de, jaegeuk@kernel.org, hirofumi@mail.parknet.co.jp, linux-nfs@vger.kernel.org, tytso@mit.edu, linux-api@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, senozhatsky@chromium.org, Chuck Lever , hansg@kernel.org, anna@kernel.org, linux-fsdevel@vger.kernel.org, sj1557.seo@samsung.com, trondmy@kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net 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. Signed-off-by: Chuck Lever --- fs/fat/fat.h | 3 +++ fs/fat/file.c | 21 +++++++++++++++++++++ fs/fat/namei_msdos.c | 1 + fs/fat/namei_vfat.c | 1 + 4 files changed, 26 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..f7f613cb763b 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 +396,25 @@ 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 && !sbi->options.nocase) + fa->fsx_xflags |= FS_XFLAG_CASENONPRESERVING; + return 0; +} + int fat_getattr(struct mnt_idmap *idmap, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int flags) { @@ -574,5 +594,6 @@ 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 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel