{"id":2230420,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230420/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260429-case-sensitivity-v12-8-8057123bebe0@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-v12-8-8057123bebe0@oracle.com>","date":"2026-04-29T18:07:19","name":"[v12,08/15] xfs: Report case sensitivity in fileattr_get","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"e558c18e1100b885a32d8f38e98b546eac1b56f9","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-v12-8-8057123bebe0@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/2230420/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230420/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=QwkTphSZ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=150.107.74.76; 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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=1777486068;\n\tbh=29KDob7D6wjAqke0cQHbkTiX/VafLuHXAnmywDOdkA0=;\n\th=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n\tb=QwkTphSZuuJKpR7RpMeiB0Di0S7+PZoPDpqd0FtYs5HP+1/knzIVollqTZ8cW55BI\n\t WuT6KATac7Yx0AZz5YSTqjbZZ9EJYgaj2YLep++OxB5GNcozJ3iY3Jr5uTxFkxIjA2\n\t EIJT3D4GFwEbCreuwEj/+9jUojxfJi5SAMZG9d9hwFE8ZE6nc0HI3XGwc9Ehn+xZmK\n\t tkUlIbCLU1PQk+4jK7cbW1kdaBr7oYbEoFigSQZr97cGqrMs0yOuRANxlCyhYGLmTf\n\t ob2/HyYyCy35KuTrOVYnrg/16f7POTQiQBRJ52irPH6WK/yr/YQPs86RE8Z4uvWVlu\n\t YQ5P+uc7SsbEQ==","From":"Chuck Lever ","Date":"Wed, 29 Apr 2026 14:07:19 -0400","Subject":"[PATCH v12 08/15] xfs: Report case sensitivity in fileattr_get","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-v12-8-8057123bebe0@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=2743;\n i=chuck.lever@oracle.com; h=from:subject:message-id;\n bh=5XtPWdQD9rNyvcNieFdC0PM+y6dNjGmJfHpo+ZOq7bw=;\n b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp8kjdqEdk0DF+qfmnWHi3Vt1gR9qIy7prabuO7\n y3XbV2QW4SJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCafJI3QAKCRAzarMzb2Z/\n l4SlD/96LAlavdzmgMVHUOE01QsUJl9DHewg8oTZ6kj7D5SwFJyVufOwx7eMhpu+2WqqW7zOB4G\n Tui0AGnVTOSG1QYr8ICcGePPH3yXcblegpIrxTtnNvrZnbqY3WJOWXBfC81l//kp3wmiCuk9Txf\n y4dHVS3lV4PCpICHSEVgUPVOlr09L7JeZzHg+RkrPbEpKUSISDYP1SpNt4EWT2jcrAdQbGNg2GZ\n ksB/ke9b7Zbz4o9dupEuf+Gy5oKlT6iBQ2+eWPIGOf+MqNh7t2oETxoyf7lDqpA9LNqwgkt7t4r\n KxWln+7KglK5JwsI9s29dy/SbJaDMmdpg+tBDqy+tNNOBBX7icTHKbJ6f6P787oSTOCTz5ob5p/\n CgRvp6rmSD82RxQTzRY6I9ZeNaSA/rk2j6BRIooPFRr5UQ/PSPQtGZyVV7+dEuSbGiB2HPuy/E5\n IfdhsOXlnDPECn5lo7uBwtrtR1+YlJYIbTCZO1VXKr68KBM5j/VP8JS0ks/X6IUnVxT5+CE0GCN\n +WdTlJpNQZXXBHzxZWBlsD6QEmsdOVCo+HpWmZsQCobfyPzngM7zDa5BKVZgFzDy9ZE+CWdPfny\n W3Lv2MGA8y3zBY6rY9toT+Qx7IcEmmvGm2dXYXoJOs5qvqsy6W96pRnTSLJhGohNl65a2FjXM77\n 3kGKMtAht4DPLtA==","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 to query whether a filesystem\nis case-sensitive. Add FS_XFLAG_CASEFOLD to xfs_ip2xflags()\nwhen the filesystem is formatted with the ASCIICI feature\nflag. This serves both FS_IOC_FSGETXATTR (via xfs_fill_fsxattr()\nin xfs_fileattr_get()) and XFS_IOC_BULKSTAT (which populates\nbs_xflags directly from xfs_ip2xflags()), so bulkstat consumers\nand per-inode queries see a consistent view of the filesystem's\ncase-folding behavior.\n\nFS_XFLAG_CASEFOLD is read-only: FS_XFLAG_RDONLY_MASK ensures\nFS_IOC_FSSETXATTR strips it, and xfs_flags2diflags() has no\nclause for CASEFOLD so the on-disk diflags are unaffected.\nThe legacy FS_IOC_SETFLAGS path in xfs_fileattr_set() also\nallows FS_CASEFOLD_FL through its allowlist on ASCIICI\nfilesystems so that a chattr read-modify-write cycle does\nnot fail with EOPNOTSUPP.\n\nXFS always preserves case. XFS is case-sensitive by default,\nbut supports ASCII case-insensitive lookups when formatted\nwith the ASCIICI feature flag.\n\nReviewed-by: Roland Mainz \nSigned-off-by: Chuck Lever \n---\n fs/xfs/libxfs/xfs_inode_util.c | 2 ++\n fs/xfs/xfs_ioctl.c | 20 +++++++++++++++++---\n 2 files changed, 19 insertions(+), 3 deletions(-)","diff":"diff --git a/fs/xfs/libxfs/xfs_inode_util.c b/fs/xfs/libxfs/xfs_inode_util.c\nindex 551fa51befb6..82be54b6f8d3 100644\n--- a/fs/xfs/libxfs/xfs_inode_util.c\n+++ b/fs/xfs/libxfs/xfs_inode_util.c\n@@ -130,6 +130,8 @@ xfs_ip2xflags(\n \n \tif (xfs_inode_has_attr_fork(ip))\n \t\tflags |= FS_XFLAG_HASATTR;\n+\tif (xfs_has_asciici(ip->i_mount))\n+\t\tflags |= FS_XFLAG_CASEFOLD;\n \treturn flags;\n }\n \ndiff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c\nindex ed9b4846c05f..f8216f74679f 100644\n--- a/fs/xfs/xfs_ioctl.c\n+++ b/fs/xfs/xfs_ioctl.c\n@@ -755,9 +755,23 @@ xfs_fileattr_set(\n \ttrace_xfs_ioctl_setattr(ip);\n \n \tif (!fa->fsx_valid) {\n-\t\tif (fa->flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL |\n-\t\t\t\t FS_NOATIME_FL | FS_NODUMP_FL |\n-\t\t\t\t FS_SYNC_FL | FS_DAX_FL | FS_PROJINHERIT_FL))\n+\t\tunsigned int allowed = FS_IMMUTABLE_FL | FS_APPEND_FL |\n+\t\t\t\t FS_NOATIME_FL | FS_NODUMP_FL |\n+\t\t\t\t FS_SYNC_FL | FS_DAX_FL |\n+\t\t\t\t FS_PROJINHERIT_FL;\n+\n+\t\t/*\n+\t\t * FS_CASEFOLD_FL reflects the ASCIICI superblock feature,\n+\t\t * a read-only property. Accept it as a no-op so chattr's\n+\t\t * RMW round-trip succeeds; reject any attempt to enable\n+\t\t * it on a non-ASCIICI filesystem. xfs_flags2diflags()\n+\t\t * has no clause for CASEFOLD, so the bit is dropped from\n+\t\t * the on-disk diflags regardless.\n+\t\t */\n+\t\tif (xfs_has_asciici(mp))\n+\t\t\tallowed |= FS_CASEFOLD_FL;\n+\n+\t\tif (fa->flags & ~allowed)\n \t\t\treturn -EOPNOTSUPP;\n \t}\n \n","prefixes":["v12","08/15"]}