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 8D44C46AF3F; Thu, 22 Jan 2026 16:03:46 +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=1769097826; cv=none; b=jlORWSz7sn+X8UkNC4faA5Lrk69zWfbIBG5zy3qQbKj3zcaRX628cqhpeYEuODrbkksd1OXJqRLQ7UWNAnYZNUeEws6DpCpE93Oovv7D6Chldf+9xFTg0AJXZclRRAb43yoe7VkAgxxX6z0Bcz1ypwLsRelTF8Bz1MSb/XHocYI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769097826; c=relaxed/simple; bh=S5yV0SBaUgD1R2/2tqPLqT6EpElAtlYalL7Zq8yyuus=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mx/k/1diJwInp8gsdUIGCiK90UIb7s99hPCd7N62AT7YfgLlT6U5Rhsv6f0scZmbMQamLd6q/88FyFyiYzf+L+hwQ0rKTnxIx6llq3zuPA/Rcc6+mfqWoSvTDLpzQUb6nQrsEWBrjaYLVzhGb4f3I7SYvOvrZg5hoTog2nYThrI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ol/O4Ni/; 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="Ol/O4Ni/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5108C2BC86; Thu, 22 Jan 2026 16:03:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769097826; bh=S5yV0SBaUgD1R2/2tqPLqT6EpElAtlYalL7Zq8yyuus=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ol/O4Ni/5OcCptFaTuy9XRSToiN01WBT3/9fM257yd8l7IAwLlZfc8zbKEIk+AwX2 dz+i9SzVU1rZ5q8SKPc+wcueCCT48/n8iF+03H5GFP0LGWGLg4DaTpG6vu7N8vyE8g /qp3VzYn/PRUBYsATJMnr7NkcKD6TFpoGvTXny+YwNd9tb6FeW77miAAPx/FYTjpzc 9z0y86oxN6rOYF/9pcGLZl9ynmCulVSgb7WMEhmu0arfSmTTk1XkIMipOFx1WjCeAd au7oxtGuiDrrqGwxG9UkisRx488ax1ddgQkUn3rqb1bgV6lVM03emqekYmn+4bSfJF kfEjwr554r1/Q== 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-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 v7 12/16] vboxsf: Implement fileattr_get for case sensitivity Date: Thu, 22 Jan 2026 11:03:07 -0500 Message-ID: <20260122160311.1117669-13-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> 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 4bebd947314a..06308e38a70d 100644 --- a/fs/vboxsf/file.c +++ b/fs/vboxsf/file.c @@ -223,7 +223,8 @@ 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) @@ -390,5 +391,6 @@ 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); -- 2.52.0