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 100E62FB630; Tue, 17 Feb 2026 21:48:18 +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=1771364899; cv=none; b=BIouyOas5O8KsIkcEGeTDDW8zSzQQHfTfhHWY7XdoKaElqMqDOxCdEfHJKd9TZ7vMwgejVKGg6YKHNPhZPkjwWoxNaZLFGwaHbuU6d1t/rz45E2E2FpgotSXcx5yo6SOm9HNpUzhHQ+fF7XjKrt3cHdrJP0AKobSM+tsdYoD1Xo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771364899; c=relaxed/simple; bh=pqdeI5TQwNAuQp+gfTQuqsR0XDwiEm8X5PZvM+QQUsU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SQ3kdRIttRvgvRO84AMvjxp/ppwBKvR4g0lG3qzMCeoqrrrQifgxEWp9G6SxgETCQ5ZiqZuy5M46ddfWVs0tTTm032PQGHyx48XcDicKITTA7WsKaqPaXEVaRqDCFCZiOCJYG3THDcXb+n/QyD5+3hTVGfWCquWT2tUClpSSxMI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VUUjwpqa; 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="VUUjwpqa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 81EA3C19425; Tue, 17 Feb 2026 21:48:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771364898; bh=pqdeI5TQwNAuQp+gfTQuqsR0XDwiEm8X5PZvM+QQUsU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VUUjwpqaqT8j+ucTcrYiXZcuuBReXbKR2b1qvdLgba5tEaA+Q10sloFLiIdWMUuG2 Zxa62EjYG/p0e5DDN1d9+Ldln1aOvpCuO4myfvsCYWpQJltxbpCgdaoFj3RmuIf16K 8MgG/OKf0Irbnl6B2BaQhG9MkoLbXewkmsdP5qThLeQMifJekJU2NbWspe2fjNHywe jFOBulYQXyzbtVtlWK9ed20sIzDRTKClcnfl1taD3pAIyF6zjh3QwXF8LuCpxJCq5t XubPWp/qBSXq+8OFXuB2vKTVF4vW8N5ju4lqp+5R2lwjqSQBybHmrBOljT6JxGOD3D bVFhZB0hV93nQ== From: Chuck Lever 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 Subject: [PATCH v8 13/17] vboxsf: Implement fileattr_get for case sensitivity Date: Tue, 17 Feb 2026 16:47:37 -0500 Message-ID: <20260217214741.1928576-14-cel@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260217214741.1928576-1-cel@kernel.org> References: <20260217214741.1928576-1-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 Upper layers such as NFSD need a way to query whether a filesystem handles filenames in a case-sensitive manner. Report VirtualBox shared folder case handling behavior via the FS_XFLAG_CASEFOLD flag. The case sensitivity property is queried from the VirtualBox host service at mount time and cached in struct vboxsf_sbi. The host determines case sensitivity based on the underlying host filesystem (for example, Windows NTFS is case-insensitive while Linux ext4 is case-sensitive). VirtualBox shared folders always preserve filename case exactly as provided by the guest. The host interface does not expose a case_preserving property, so this is hardcoded to true. The callback is registered in all three inode_operations structures (directory, file, and symlink) to ensure consistent reporting across all inode types. Signed-off-by: Chuck Lever --- fs/vboxsf/dir.c | 1 + fs/vboxsf/file.c | 6 ++++-- fs/vboxsf/super.c | 4 ++++ fs/vboxsf/utils.c | 31 +++++++++++++++++++++++++++++++ fs/vboxsf/vfsmod.h | 6 ++++++ 5 files changed, 46 insertions(+), 2 deletions(-) diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c index 42bedc4ec7af..c5bd3271aa96 100644 --- a/fs/vboxsf/dir.c +++ b/fs/vboxsf/dir.c @@ -477,4 +477,5 @@ const struct inode_operations vboxsf_dir_iops = { .symlink = vboxsf_dir_symlink, .getattr = vboxsf_getattr, .setattr = vboxsf_setattr, + .fileattr_get = vboxsf_fileattr_get, }; diff --git a/fs/vboxsf/file.c b/fs/vboxsf/file.c index 111752010edb..30a4f4262928 100644 --- a/fs/vboxsf/file.c +++ b/fs/vboxsf/file.c @@ -222,7 +222,8 @@ const struct file_operations vboxsf_reg_fops = { const struct inode_operations vboxsf_reg_iops = { .getattr = vboxsf_getattr, - .setattr = vboxsf_setattr + .setattr = vboxsf_setattr, + .fileattr_get = vboxsf_fileattr_get, }; static int vboxsf_read_folio(struct file *file, struct folio *folio) @@ -389,5 +390,6 @@ static const char *vboxsf_get_link(struct dentry *dentry, struct inode *inode, } const struct inode_operations vboxsf_lnk_iops = { - .get_link = vboxsf_get_link + .get_link = vboxsf_get_link, + .fileattr_get = vboxsf_fileattr_get, }; diff --git a/fs/vboxsf/super.c b/fs/vboxsf/super.c index 241647b060ee..fcabeca2a339 100644 --- a/fs/vboxsf/super.c +++ b/fs/vboxsf/super.c @@ -185,6 +185,10 @@ static int vboxsf_fill_super(struct super_block *sb, struct fs_context *fc) if (err) goto fail_unmap; + err = vboxsf_query_case_sensitive(sbi); + if (err) + goto fail_unmap; + sb->s_magic = VBOXSF_SUPER_MAGIC; sb->s_blocksize = 1024; sb->s_maxbytes = MAX_LFS_FILESIZE; diff --git a/fs/vboxsf/utils.c b/fs/vboxsf/utils.c index 9515bbf0b54c..658b8b0ebbd7 100644 --- a/fs/vboxsf/utils.c +++ b/fs/vboxsf/utils.c @@ -11,6 +11,7 @@ #include #include #include +#include #include "vfsmod.h" struct inode *vboxsf_new_inode(struct super_block *sb) @@ -567,3 +568,33 @@ int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d, return err; } + +int vboxsf_query_case_sensitive(struct vboxsf_sbi *sbi) +{ + struct shfl_volinfo volinfo = {}; + u32 buf_len; + int err; + + buf_len = sizeof(volinfo); + err = vboxsf_fsinfo(sbi->root, 0, SHFL_INFO_GET | SHFL_INFO_VOLUME, + &buf_len, &volinfo); + if (err) + return err; + + sbi->case_insensitive = !volinfo.properties.case_sensitive; + return 0; +} + +int vboxsf_fileattr_get(struct dentry *dentry, struct file_kattr *fa) +{ + struct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb); + + /* + * VirtualBox shared folders preserve filename case exactly as + * provided by the guest (the default). The host interface does + * not expose a case-preservation property. + */ + if (sbi->case_insensitive) + fa->fsx_xflags |= FS_XFLAG_CASEFOLD; + return 0; +} diff --git a/fs/vboxsf/vfsmod.h b/fs/vboxsf/vfsmod.h index 05973eb89d52..b61afd0ce842 100644 --- a/fs/vboxsf/vfsmod.h +++ b/fs/vboxsf/vfsmod.h @@ -47,6 +47,7 @@ struct vboxsf_sbi { u32 next_generation; u32 root; int bdi_id; + bool case_insensitive; }; /* per-inode information */ @@ -111,6 +112,11 @@ void vboxsf_dir_info_free(struct vboxsf_dir_info *p); int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d, u64 handle); +int vboxsf_query_case_sensitive(struct vboxsf_sbi *sbi); + +struct file_kattr; +int vboxsf_fileattr_get(struct dentry *dentry, struct file_kattr *fa); + /* from vboxsf_wrappers.c */ int vboxsf_connect(void); void vboxsf_disconnect(void); -- 2.53.0