{"id":2230426,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230426/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260429-case-sensitivity-v12-11-8057123bebe0@oracle.com/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.1/projects/8/?format=json","name":"Linux ext4 filesystem development","link_name":"linux-ext4","list_id":"linux-ext4.vger.kernel.org","list_email":"linux-ext4@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260429-case-sensitivity-v12-11-8057123bebe0@oracle.com>","date":"2026-04-29T18:07:22","name":"[v12,11/15] vboxsf: Implement fileattr_get for case sensitivity","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"4ae27aa30fe77ecb936be3d122f94eeaad0d0de6","submitter":{"id":86689,"url":"http://patchwork.ozlabs.org/api/1.1/people/86689/?format=json","name":"Chuck Lever","email":"cel@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260429-case-sensitivity-v12-11-8057123bebe0@oracle.com/mbox/","series":[{"id":502125,"url":"http://patchwork.ozlabs.org/api/1.1/series/502125/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/list/?series=502125","date":"2026-04-29T18:07:11","name":"Exposing case folding behavior","version":12,"mbox":"http://patchwork.ozlabs.org/series/502125/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2230426/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230426/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=W47czziU;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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arc=none smtp.client-ip=10.30.226.201"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1777486075;\n\tbh=4PnVhA68/lwOR6kFOGBj/fhhmjpnw+nIMjeX3NeO8qI=;\n\th=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n\tb=W47czziUbR3rnfyfFtTziFe7YvdoxS3Z4H9XIBokiqtq7ZsFjBalNnRZAUdKVr0+v\n\t zeXQwUhQbM+EGSCqZY8+++Jw9+5Rg2LVozRIJteTQYePtv9IbjRSNuptxW4+8ompA0\n\t ONzbk2ukKU/Q5q99MWgdJfMdf9KNO1rp76SaIRp/5detQDu07ft4YZDPSZmKG+YTYj\n\t W0EksIKcqBVuAwP67q043FAHfaxbP7K0J6TS1yhseY7dG9jmcgTa82Slv1dlOYYEOu\n\t 02ZvrLZ/7drigKKCKdMYmWqEXM7KvcvSNxj9x36bm+QwXlZAdsU2N+MTs8bEHVIuVo\n\t sAy47rkKdV0Og==","From":"Chuck Lever ","Date":"Wed, 29 Apr 2026 14:07:22 -0400","Subject":"[PATCH v12 11/15] vboxsf: Implement fileattr_get for case\n 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-v12-11-8057123bebe0@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 ,\n Christian Brauner , Jan Kara ","Cc":"linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,\n linux-xfs@vger.kernel.org, linux-cifs@vger.kernel.org,\n linux-nfs@vger.kernel.org, linux-api@vger.kernel.org,\n linux-f2fs-devel@lists.sourceforge.net, hirofumi@mail.parknet.co.jp,\n linkinjeon@kernel.org, sj1557.seo@samsung.com, yuezhang.mo@sony.com,\n almaz.alexandrovich@paragon-software.com, slava@dubeyko.com,\n glaubitz@physik.fu-berlin.de, frank.li@vivo.com, tytso@mit.edu,\n adilger.kernel@dilger.ca, cem@kernel.org, sfrench@samba.org,\n pc@manguebit.org, ronniesahlberg@gmail.com, sprasad@microsoft.com,\n trondmy@kernel.org, anna@kernel.org, jaegeuk@kernel.org, chao@kernel.org,\n hansg@kernel.org, senozhatsky@chromium.org,\n Chuck Lever ,\n Roland Mainz ","X-Mailer":"b4 0.16-dev","X-Developer-Signature":"v=1; a=openpgp-sha256; l=4902;\n i=chuck.lever@oracle.com; h=from:subject:message-id;\n bh=IS91PG/gteNIi+mr5kWAFzEwamMgenFgJebFqDZEBwA=;\n b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp8kjdjSjmh5drX2VKvO9m83fn04q85uzYXt4XV\n OuYvmhhYlWJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCafJI3QAKCRAzarMzb2Z/\n l92cEACqiQ8yaBBGkGz2rQn3hI6g0eCT8TMoPGlAKgGye1bemu3aA/yy25U0VUWkWTrYeOh7XgI\n kItVC6OdDRYAd22wbjCxuaKnOBwGxeQjq6uH6kOpusqZw+GYhsLu3i+E9t69bfc/X35Jm6I3XTC\n JTuhcDAkooUJDR9C6yNTZ86+4MzCWwe1ACW+ODGtGEVWt9uj5Yyt7OCnkVaVPypkR1Qi2YK4sQl\n qESf7yaO9+L+VW9lqjEVOxwzN8rmL3IDZoZXGN7D6FA6jMrOS6Oomjj9In62miBDl+I7fu+4Tl9\n CPecnK0kGXUdvjtjuS/sjImyvkB8TselCY1SCqGMLZ+OjkgCuEyKgejVfBmJtV5LUD1KxjUVtDU\n 6/q8L1PqJrtmjstOws4VZzfeyTLi8ZZmSDUH4Ww2FuHmKzRDI3Luwfpc1TqvWCRB/Fc5wUtL5II\n fNQUFaEzue29yw8U791ihmoUwbBSrqduPTXzBVan6wxG3o2a4V+MFjMFlYEhk7Scs389EjPM5qC\n 28ZDmeX76WuVD48U2Hqy75LfQE92W1/zYpLQAb5SJ+Nu9OZzkcywcrKKt0Jx7H+SAPhMwVcKJ95\n Uxfy+FvMBS55rhhrNomhbDB4thr/PCJx2ouDQLCMYs7BEwWo9GYMoAe0+LO8RXALeZ4aMEsdtq6\n ZA+8dBlD0S3ly4g==","X-Developer-Key":"i=chuck.lever@oracle.com; a=openpgp;\n fpr=28B2E5B01286DF243CF23EFE336AB3336F667F97","X-Spam-Status":"No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"},"content":"From: Chuck Lever \n\nUpper layers such as NFSD need a way to query whether a\nfilesystem handles filenames in a case-sensitive manner. Report\nVirtualBox shared folder case handling behavior via the\nFS_XFLAG_CASEFOLD flag.\n\nThe case sensitivity property is queried from the VirtualBox host\nservice at mount time and cached in struct vboxsf_sbi. The host\ndetermines case sensitivity based on the underlying host filesystem\n(for example, Windows NTFS is case-insensitive while Linux ext4 is\ncase-sensitive).\n\nVirtualBox shared folders always preserve filename case exactly\nas provided by the guest. The host interface does not expose a\nseparate case-preserving property; leaving\nFS_XFLAG_CASENONPRESERVING unset reports the POSIX-default\ncase-preserving behavior, which matches vboxsf semantics.\n\nThe callback is registered in all three inode_operations\nstructures (directory, file, and symlink) to ensure consistent\nreporting across all inode types.\n\nReviewed-by: Roland Mainz \nSigned-off-by: Chuck Lever \n---\n fs/vboxsf/dir.c | 1 +\n fs/vboxsf/file.c | 6 ++++--\n fs/vboxsf/super.c | 7 +++++++\n fs/vboxsf/utils.c | 30 ++++++++++++++++++++++++++++++\n fs/vboxsf/vfsmod.h | 6 ++++++\n 5 files changed, 48 insertions(+), 2 deletions(-)","diff":"diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c\nindex 42bedc4ec7af..c5bd3271aa96 100644\n--- a/fs/vboxsf/dir.c\n+++ b/fs/vboxsf/dir.c\n@@ -477,4 +477,5 @@ const struct inode_operations vboxsf_dir_iops = {\n \t.symlink = vboxsf_dir_symlink,\n \t.getattr = vboxsf_getattr,\n \t.setattr = vboxsf_setattr,\n+\t.fileattr_get = vboxsf_fileattr_get,\n };\ndiff --git a/fs/vboxsf/file.c b/fs/vboxsf/file.c\nindex 7a7a3fbb2651..943953867e18 100644\n--- a/fs/vboxsf/file.c\n+++ b/fs/vboxsf/file.c\n@@ -222,7 +222,8 @@ const struct file_operations vboxsf_reg_fops = {\n \n const struct inode_operations vboxsf_reg_iops = {\n \t.getattr = vboxsf_getattr,\n-\t.setattr = vboxsf_setattr\n+\t.setattr = vboxsf_setattr,\n+\t.fileattr_get = vboxsf_fileattr_get,\n };\n \n static int vboxsf_read_folio(struct file *file, struct folio *folio)\n@@ -389,5 +390,6 @@ static const char *vboxsf_get_link(struct dentry *dentry, struct inode *inode,\n }\n \n const struct inode_operations vboxsf_lnk_iops = {\n-\t.get_link = vboxsf_get_link\n+\t.get_link = vboxsf_get_link,\n+\t.fileattr_get = vboxsf_fileattr_get,\n };\ndiff --git a/fs/vboxsf/super.c b/fs/vboxsf/super.c\nindex a618cb093e00..a61fbab51d37 100644\n--- a/fs/vboxsf/super.c\n+++ b/fs/vboxsf/super.c\n@@ -185,6 +185,13 @@ static int vboxsf_fill_super(struct super_block *sb, struct fs_context *fc)\n \tif (err)\n \t\tgoto fail_unmap;\n \n+\t/*\n+\t * A failed query leaves sbi->case_insensitive false, so the\n+\t * mount defaults to reporting case-sensitive behavior. Do not\n+\t * fail the mount over an advisory attribute.\n+\t */\n+\tvboxsf_query_case_sensitive(sbi);\n+\n \tsb->s_magic = VBOXSF_SUPER_MAGIC;\n \tsb->s_blocksize = 1024;\n \tsb->s_maxbytes = MAX_LFS_FILESIZE;\ndiff --git a/fs/vboxsf/utils.c b/fs/vboxsf/utils.c\nindex 440e8c50629d..298bfc93255c 100644\n--- a/fs/vboxsf/utils.c\n+++ b/fs/vboxsf/utils.c\n@@ -11,6 +11,7 @@\n #include \n #include \n #include \n+#include \n #include \"vfsmod.h\"\n \n struct inode *vboxsf_new_inode(struct super_block *sb)\n@@ -567,3 +568,32 @@ int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d,\n \n \treturn err;\n }\n+\n+int vboxsf_query_case_sensitive(struct vboxsf_sbi *sbi)\n+{\n+\tstruct shfl_volinfo volinfo = {};\n+\tu32 buf_len;\n+\tint err;\n+\n+\tbuf_len = sizeof(volinfo);\n+\terr = vboxsf_fsinfo(sbi->root, 0, SHFL_INFO_GET | SHFL_INFO_VOLUME,\n+\t\t\t &buf_len, &volinfo);\n+\tif (err)\n+\t\treturn err;\n+\tif (buf_len < sizeof(volinfo))\n+\t\treturn 0;\n+\n+\tsbi->case_insensitive = !volinfo.properties.case_sensitive;\n+\treturn 0;\n+}\n+\n+int vboxsf_fileattr_get(struct dentry *dentry, struct file_kattr *fa)\n+{\n+\tstruct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb);\n+\n+\tif (sbi->case_insensitive) {\n+\t\tfa->fsx_xflags |= FS_XFLAG_CASEFOLD;\n+\t\tfa->flags |= FS_CASEFOLD_FL;\n+\t}\n+\treturn 0;\n+}\ndiff --git a/fs/vboxsf/vfsmod.h b/fs/vboxsf/vfsmod.h\nindex 05973eb89d52..b61afd0ce842 100644\n--- a/fs/vboxsf/vfsmod.h\n+++ b/fs/vboxsf/vfsmod.h\n@@ -47,6 +47,7 @@ struct vboxsf_sbi {\n \tu32 next_generation;\n \tu32 root;\n \tint bdi_id;\n+\tbool case_insensitive;\n };\n \n /* per-inode information */\n@@ -111,6 +112,11 @@ void vboxsf_dir_info_free(struct vboxsf_dir_info *p);\n int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d,\n \t\t\tu64 handle);\n \n+int vboxsf_query_case_sensitive(struct vboxsf_sbi *sbi);\n+\n+struct file_kattr;\n+int vboxsf_fileattr_get(struct dentry *dentry, struct file_kattr *fa);\n+\n /* from vboxsf_wrappers.c */\n int vboxsf_connect(void);\n void vboxsf_disconnect(void);\n","prefixes":["v12","11/15"]}