{"id":2232061,"url":"http://patchwork.ozlabs.org/api/patches/2232061/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260502-case-sensitivity-v13-2-aa853140311f@oracle.com/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/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,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260502-case-sensitivity-v13-2-aa853140311f@oracle.com>","list_archive_url":null,"date":"2026-05-02T14:20:47","name":"[v13,02/15] fs: Add case sensitivity flags to file_kattr","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"88be93badfa2c2c076765ad8e678c7bbe57ce420","submitter":{"id":86689,"url":"http://patchwork.ozlabs.org/api/people/86689/?format=json","name":"Chuck Lever","email":"cel@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260502-case-sensitivity-v13-2-aa853140311f@oracle.com/mbox/","series":[{"id":502531,"url":"http://patchwork.ozlabs.org/api/series/502531/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/list/?series=502531","date":"2026-05-02T14:20:45","name":"Exposing case folding behavior","version":13,"mbox":"http://patchwork.ozlabs.org/series/502531/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2232061/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2232061/checks/","tags":{},"related":[],"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=eBqm6Jbp;\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=1777731684;\n\tbh=TFF/jZiZrtLjdmF8xjSA6CfyQJOvsGBZ0ycggreXc9A=;\n\th=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n\tb=eBqm6JbpRK09m+KExsWIch+7qexNWkXHfSuKfQsPH3igH9S0hx55rOI3RECIyDgut\n\t ba5hgcKkWHEdgHrELG7V5cu+6Cg8MIy1C2Mw9IxRth2baXXTD//welnTG443nX9+XT\n\t aY5rLIEQX8fMsSCu4C28ijmsWtz70KPXPvOpVcJI+B32zuZDzhccQgNL2rhyPOr3xq\n\t TCtYd+Un0PMfk5IknQT81pmR4CFNbuAn7NvSnqcVwyRD96Ek9OXKrgAzmGUzITFIhm\n\t 4ORFmahgyFsoNuXn5fQOvuzYGJU+hFnEJnTBz/P+jOIqqsZGSvzBJLyUlpg9yYZKPr\n\t 926vI7LDd8fcA==","From":"Chuck Lever ","Date":"Sat, 02 May 2026 10:20:47 -0400","Subject":"[PATCH v13 02/15] fs: Add case sensitivity flags to file_kattr","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":"<20260502-case-sensitivity-v13-2-aa853140311f@oracle.com>","References":"<20260502-case-sensitivity-v13-0-aa853140311f@oracle.com>","In-Reply-To":"<20260502-case-sensitivity-v13-0-aa853140311f@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 , \"Darrick J. Wong\" ,\n Roland Mainz ","X-Mailer":"b4 0.16-dev","X-Developer-Signature":"v=1; a=openpgp-sha256; l=3394;\n i=chuck.lever@oracle.com; h=from:subject:message-id;\n bh=42BtA/ECrX4U52i4InslT9hET7DZ27jCO0bDUKFKJW4=;\n b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp9ghQV+ptopOEb4wuPXE4DInwNk+An3UAx3Qf5\n fBVOOGX8DGJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCafYIUAAKCRAzarMzb2Z/\n l5l/EAC2A5aQCzII1dTBCddUEb+UL/2uO93cCUFllxX6Zm/t/Z+JqJhz1tPahCAyJA9rUuS/YSM\n 07Ykt0E2RrWq/U96W9a4pBcrs3oefHicWW1UHARLONhXkXQmgAbFyN9VzVXlcWOehM6wWxOnBTB\n w+qKTrJx2v6V7OHxLzufRkj9kLE4tbFa5wHGfphUqWDhAGQ3rzKTEcIU5DHCyGcF/QMg8y8zUXk\n fhxN+QRr9CBLG/bmwGkOxhM183F9U5qYNDDuYUKXw9kNjOUABNbZezOX+IWFFb7JJn+A0UNtW39\n eDPcseFtPED7Bpy/tIYQFs70Ts/9HvBvPhwSV8iZel3QhJ1Syf1nAzp1fZ2toFlcoydG1g+Mgs8\n Z8rUyHuwVI4F7eKUnfaa0R/a6FgQ/OifSzLXxNV/Fj+6ztb/DEiLalVAQKJXLIE8klSDe1LXpL3\n v8e5CGdoDT+cETDvSffecXeB8CmE4HYD7/XkvKecxBZn2xI4fljsSaRTAVHC/i4CoeSHN1Oiff/\n 4vRX76cWTrqjzjJCfT1UdwJRSSFArYxAGlkXcP1C9oj7sPTR/x214JbqYDG9vTF+ZGF/R1gQyKX\n n3af4+Z+LMuvn0c2LMik5RU+apcS3waaFIvXWmBwuK7jyUF0NNzfVUk9P0jopol+X7eaRnwXeGb\n rBLWb6S8WpyvcjA==","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\nEnable upper layers such as NFSD to retrieve case sensitivity\ninformation from file systems by adding FS_XFLAG_CASEFOLD and\nFS_XFLAG_CASENONPRESERVING flags.\n\nFilesystems report case-insensitive or case-nonpreserving behavior\nby setting these flags directly in fa->fsx_xflags. The default\n(flags unset) indicates POSIX semantics: case-sensitive and\ncase-preserving. Both flags are added to FS_XFLAG_RDONLY_MASK so\nFS_IOC_FSSETXATTR silently strips them, keeping the new xflags\nstrictly a reporting interface. Callers that want to toggle\ncasefolding continue to use FS_IOC_SETFLAGS with FS_CASEFOLD_FL,\nthe established UAPI on filesystems that support the operation\n(ext4 and f2fs on empty directories).\n\nCase sensitivity information is exported to userspace via the\nfa_xflags field in the FS_IOC_FSGETXATTR ioctl and file_getattr()\nsystem call.\n\nReviewed-by: \"Darrick J. Wong\" \nReviewed-by: Jan Kara \nReviewed-by: Roland Mainz \nSigned-off-by: Chuck Lever \n---\n fs/file_attr.c | 4 ++++\n include/linux/fileattr.h | 3 ++-\n include/uapi/linux/fs.h | 7 +++++++\n 3 files changed, 13 insertions(+), 1 deletion(-)","diff":"diff --git a/fs/file_attr.c b/fs/file_attr.c\nindex f429da66a317..bfb00d256dd5 100644\n--- a/fs/file_attr.c\n+++ b/fs/file_attr.c\n@@ -37,6 +37,8 @@ void fileattr_fill_xflags(struct file_kattr *fa, u32 xflags)\n \t\tfa->flags |= FS_PROJINHERIT_FL;\n \tif (fa->fsx_xflags & FS_XFLAG_VERITY)\n \t\tfa->flags |= FS_VERITY_FL;\n+\tif (fa->fsx_xflags & FS_XFLAG_CASEFOLD)\n+\t\tfa->flags |= FS_CASEFOLD_FL;\n }\n EXPORT_SYMBOL(fileattr_fill_xflags);\n \n@@ -67,6 +69,8 @@ void fileattr_fill_flags(struct file_kattr *fa, u32 flags)\n \t\tfa->fsx_xflags |= FS_XFLAG_PROJINHERIT;\n \tif (fa->flags & FS_VERITY_FL)\n \t\tfa->fsx_xflags |= FS_XFLAG_VERITY;\n+\tif (fa->flags & FS_CASEFOLD_FL)\n+\t\tfa->fsx_xflags |= FS_XFLAG_CASEFOLD;\n }\n EXPORT_SYMBOL(fileattr_fill_flags);\n \ndiff --git a/include/linux/fileattr.h b/include/linux/fileattr.h\nindex 3780904a63a6..58044b598016 100644\n--- a/include/linux/fileattr.h\n+++ b/include/linux/fileattr.h\n@@ -16,7 +16,8 @@\n \n /* Read-only inode flags */\n #define FS_XFLAG_RDONLY_MASK \\\n-\t(FS_XFLAG_PREALLOC | FS_XFLAG_HASATTR | FS_XFLAG_VERITY)\n+\t(FS_XFLAG_PREALLOC | FS_XFLAG_HASATTR | FS_XFLAG_VERITY | \\\n+\t FS_XFLAG_CASEFOLD | FS_XFLAG_CASENONPRESERVING)\n \n /* Flags to indicate valid value of fsx_ fields */\n #define FS_XFLAG_VALUES_MASK \\\ndiff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h\nindex 13f71202845e..2ea4c81df08f 100644\n--- a/include/uapi/linux/fs.h\n+++ b/include/uapi/linux/fs.h\n@@ -254,6 +254,13 @@ struct file_attr {\n #define FS_XFLAG_DAX\t\t0x00008000\t/* use DAX for IO */\n #define FS_XFLAG_COWEXTSIZE\t0x00010000\t/* CoW extent size allocator hint */\n #define FS_XFLAG_VERITY\t\t0x00020000\t/* fs-verity enabled */\n+/*\n+ * Case handling flags (read-only, cannot be set via ioctl).\n+ * Default (neither set) indicates POSIX semantics: case-sensitive\n+ * lookups and case-preserving storage.\n+ */\n+#define FS_XFLAG_CASEFOLD\t0x00040000\t/* case-insensitive lookups */\n+#define FS_XFLAG_CASENONPRESERVING 0x00080000\t/* case not preserved */\n #define FS_XFLAG_HASATTR\t0x80000000\t/* no DIFLAG for this\t*/\n \n /* the read-only stuff doesn't really belong here, but any other place is\n","prefixes":["v13","02/15"]}