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GET /api/patches/2228071/?format=api
{ "id": 2228071, "url": "http://patchwork.ozlabs.org/api/patches/2228071/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260424-case-sensitivity-v11-13-de5619beddaf@oracle.com/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/projects/8/?format=api", "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": "<20260424-case-sensitivity-v11-13-de5619beddaf@oracle.com>", "list_archive_url": null, "date": "2026-04-25T01:53:15", "name": "[v11,13/15] nfsd: Report export case-folding via NFSv3 PATHCONF", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "08b8ed8b961192b2f466c947d87d4bedcb5dff94", "submitter": { "id": 86689, "url": "http://patchwork.ozlabs.org/api/people/86689/?format=api", "name": "Chuck Lever", "email": "cel@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260424-case-sensitivity-v11-13-de5619beddaf@oracle.com/mbox/", "series": [ { "id": 501417, "url": "http://patchwork.ozlabs.org/api/series/501417/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=501417", "date": "2026-04-25T01:53:02", "name": "Exposing case folding behavior", "version": 11, "mbox": "http://patchwork.ozlabs.org/series/501417/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2228071/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2228071/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=pJnc=CY=vger.kernel.org=linux-ext4+bounces-16095-patchwork-incoming=ozlabs.org@ozlabs.org>", "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=u5ls4ajC;\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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a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777082036; c=relaxed/simple;\n\tbh=OyLhtXrNpz8D2WvRJaUa8omBuZCmPi2gdz7MuhZWO2U=;\n\th=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References:\n\t In-Reply-To:To:Cc;\n b=U8fH1EHQEH4mo03iqIBNshUD9M/V/vzez1QEplyd8w27cehtgAvrqQkZBul2qkVOh9QmVeOuxzSh4iHJJEkDng8RUOERanVoTp2/CBbuoW4LBVV9xyMXUdsBZlGFIuk5CCbwO7Wr6ss3cmiFYM6yRkYONqEXbQAeKN/DqMJ2Zuo=" ], "ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org;\n dkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=u5ls4ajC; dkim-atps=neutral;\n spf=pass (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=linux-ext4+bounces-16095-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org", "i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=u5ls4ajC; 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=1777082036;\n\tbh=OyLhtXrNpz8D2WvRJaUa8omBuZCmPi2gdz7MuhZWO2U=;\n\th=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n\tb=u5ls4ajCrDxaabG/eUULQCayzzn0FxGdJ0h2eF/6yiu1+VEVbpvL3VoFwMiT41uFO\n\t 45sB5xlpJHd+bD+Blck8AXyyr7y21+0/HL1LZn4Sbb1wjjMsrFbekWY67rP+jZiKay\n\t uL+zcojc7UfJR+m01g0rPsZQ2cJIzN1ny90H6yd8WdHpV7EH4GwxWIhcieAlSO42YV\n\t Q1kdGrOGtmSKz1IAGXtPVhdwaOAkVBoRbgsYwVyvlKcbwJtrtKdsXpFzp5rnIZBs5g\n\t X38GgUl7e0xKM+pyVDn22d86CciPKZ4jQ+xMp0hDvyOw3vHuW7OqaQpNK2++q2pi/w\n\t u5xycbXZ8HapA==", "From": "Chuck Lever <cel@kernel.org>", "Date": "Fri, 24 Apr 2026 21:53:15 -0400", "Subject": "[PATCH v11 13/15] nfsd: Report export case-folding via NFSv3\n PATHCONF", "Precedence": "bulk", "X-Mailing-List": "linux-ext4@vger.kernel.org", "List-Id": "<linux-ext4.vger.kernel.org>", "List-Subscribe": "<mailto:linux-ext4+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-ext4+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "Message-Id": "<20260424-case-sensitivity-v11-13-de5619beddaf@oracle.com>", "References": "<20260424-case-sensitivity-v11-0-de5619beddaf@oracle.com>", "In-Reply-To": "<20260424-case-sensitivity-v11-0-de5619beddaf@oracle.com>", "To": "Al Viro <viro@zeniv.linux.org.uk>,\n Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>", "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 <chuck.lever@oracle.com>,\n Roland Mainz <roland.mainz@nrubsig.org>", "X-Mailer": "b4 0.16-dev", "X-Developer-Signature": "v=1; a=openpgp-sha256; l=4215;\n i=chuck.lever@oracle.com; h=from:subject:message-id;\n bh=YpboDqA/tDvRzcdcF8b8ZwECQrfPFzdzvA+uLgueOwI=;\n b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp7B6RVAwGk4HxMo5K1jJ5BigRqDIrVb1SGoayj\n BXjhQVoJ2qJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCaewekQAKCRAzarMzb2Z/\n l+npD/918vXvKFGss9WIcMGCwoxVEeUj7IKF6YmyR8/POJsszj3LZO2KLLSMMuH8dfwR0HQ5hzz\n zOdB6ehv+nZ5JMtg5HMXZx4kjXRjhipq8WZOrbxpvTsvcqFAUOO4hCkaVjEVSbNt+lEmM6GyT3L\n RJy4JqkUvDTnIFdUgL2mZQ9AP4SeZQnhUq+N5yB0LVltPB9q7YolmuNYjJp8VT2D2Znw3XBJw8a\n G8MR0h2x5mskZ4u+PzHFNtB4bQNpOGOKX3R2AVclVp+sQ6QkBjn+kaW42/yayH9hRsXt1MGws2+\n ybnGk66QcZhVlc2zJNsAjCkvQomr5IGSft8jDMGJ2SbgsrgpLKqSwWlTvXmsH8ROPvzBpAkFS+M\n 9Eafbt8Rn3JrUz342Zv5hcio0q0owOFYBDZZfVUz5Y4G2pTXB1Yo/txdVUO01dGpq1JgtHjuDDW\n 3LuqteJkf2fLyrlsCuPrwxU+JvhwIOmHCMefTPKBHANcJVVdgcdvjnqctZVBxgtFBNovGRNI7tk\n VTDn1ycm/0EAb3cUMSXwcRJNNnsK0GvnZMTx3GyZpZmiWhMRBmrfX/YvuRbl3Q3i0y8++F5Bum3\n 2XODwbWBqsVLBc//Zt9MSwWreXXM/pL5Hw0cXCVw7A5xcKx/Yhz/srW4iOaH/tOb9ivdqMQWf4A\n uYVoRzy0j0ES++Q==", "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 <chuck.lever@oracle.com>\n\nThe hard-coded MSDOS_SUPER_MAGIC check in nfsd3_proc_pathconf()\nonly recognizes FAT filesystems as case-insensitive. Modern\nfilesystems like F2FS, exFAT, and CIFS support case-insensitive\ndirectories, but NFSv3 clients cannot discover this capability.\n\nQuery the export's actual case behavior through ->fileattr_get\ninstead. This allows NFSv3 clients to correctly handle case\nsensitivity for any filesystem that implements the fileattr\ninterface. Filesystems without ->fileattr_get continue to report\nthe default POSIX behavior (case-sensitive, case-preserving).\n\nThis change depends on commit (\"fat: Implement fileattr_get for\ncase sensitivity\"), which ensures FAT filesystems report their\ncase behavior correctly via the fileattr interface.\n\nReviewed-by: Roland Mainz <roland.mainz@nrubsig.org>\nSigned-off-by: Chuck Lever <chuck.lever@oracle.com>\n---\n fs/nfsd/nfs3proc.c | 18 ++++++++++--------\n fs/nfsd/vfs.c | 43 +++++++++++++++++++++++++++++++++++++++++++\n fs/nfsd/vfs.h | 3 +++\n 3 files changed, 56 insertions(+), 8 deletions(-)", "diff": "diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c\nindex 42adc5461db0..7b094c5908f1 100644\n--- a/fs/nfsd/nfs3proc.c\n+++ b/fs/nfsd/nfs3proc.c\n@@ -717,17 +717,19 @@ nfsd3_proc_pathconf(struct svc_rqst *rqstp)\n \n \tif (resp->status == nfs_ok) {\n \t\tstruct super_block *sb = argp->fh.fh_dentry->d_sb;\n+\t\tbool case_insensitive, case_preserving;\n \n-\t\t/* Note that we don't care for remote fs's here */\n-\t\tswitch (sb->s_magic) {\n-\t\tcase EXT2_SUPER_MAGIC:\n+\t\tif (sb->s_magic == EXT2_SUPER_MAGIC) {\n \t\t\tresp->p_link_max = EXT2_LINK_MAX;\n \t\t\tresp->p_name_max = EXT2_NAME_LEN;\n-\t\t\tbreak;\n-\t\tcase MSDOS_SUPER_MAGIC:\n-\t\t\tresp->p_case_insensitive = 1;\n-\t\t\tresp->p_case_preserving = 0;\n-\t\t\tbreak;\n+\t\t}\n+\n+\t\tresp->status = nfsd_get_case_info(argp->fh.fh_dentry,\n+\t\t\t\t\t\t &case_insensitive,\n+\t\t\t\t\t\t &case_preserving);\n+\t\tif (resp->status == nfs_ok) {\n+\t\t\tresp->p_case_insensitive = case_insensitive;\n+\t\t\tresp->p_case_preserving = case_preserving;\n \t\t}\n \t}\n \ndiff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c\nindex eafdf7b7890f..9214f1f1f83d 100644\n--- a/fs/nfsd/vfs.c\n+++ b/fs/nfsd/vfs.c\n@@ -32,6 +32,7 @@\n #include <linux/writeback.h>\n #include <linux/security.h>\n #include <linux/sunrpc/xdr.h>\n+#include <linux/fileattr.h>\n \n #include \"xdr3.h\"\n \n@@ -2891,3 +2892,45 @@ nfsd_permission(struct svc_cred *cred, struct svc_export *exp,\n \n \treturn err? nfserrno(err) : 0;\n }\n+\n+/**\n+ * nfsd_get_case_info - get case sensitivity info for a dentry\n+ * @dentry: dentry to query\n+ * @case_insensitive: output, true if the filesystem is case-insensitive\n+ * @case_preserving: output, true if the filesystem preserves case\n+ *\n+ * Filesystems without ->fileattr_get report POSIX defaults\n+ * (case-sensitive, case-preserving). Outputs are unmodified on\n+ * failure.\n+ *\n+ * Return: nfs_ok on success, or an nfserr on failure.\n+ */\n+__be32\n+nfsd_get_case_info(struct dentry *dentry, bool *case_insensitive,\n+\t\t bool *case_preserving)\n+{\n+\tstruct file_kattr fa = {};\n+\tint err;\n+\n+\terr = vfs_fileattr_get(dentry, &fa);\n+\tswitch (err) {\n+\tcase 0:\n+\t\t/* Success. */\n+\t\tbreak;\n+\tcase -EINVAL:\n+\tcase -ENOTTY:\n+\tcase -ENOIOCTLCMD:\n+\t\t/* Query not supported: Report POSIX defaults. */\n+\t\tbreak;\n+\tdefault:\n+\t\t/*\n+\t\t * Query failed: Propagate that error since\n+\t\t * support for case-folding is unknown.\n+\t\t */\n+\t\treturn nfserrno(err);\n+\t}\n+\n+\t*case_insensitive = fa.fsx_xflags & FS_XFLAG_CASEFOLD;\n+\t*case_preserving = !(fa.fsx_xflags & FS_XFLAG_CASENONPRESERVING);\n+\treturn nfs_ok;\n+}\ndiff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h\nindex 702a844f2106..abf33389ee81 100644\n--- a/fs/nfsd/vfs.h\n+++ b/fs/nfsd/vfs.h\n@@ -156,6 +156,9 @@ __be32\t\tnfsd_readdir(struct svc_rqst *, struct svc_fh *,\n \t\t\t loff_t *, struct readdir_cd *, nfsd_filldir_t);\n __be32\t\tnfsd_statfs(struct svc_rqst *, struct svc_fh *,\n \t\t\t\tstruct kstatfs *, int access);\n+__be32\t\tnfsd_get_case_info(struct dentry *dentry,\n+\t\t\t\t bool *case_insensitive,\n+\t\t\t\t bool *case_preserving);\n \n __be32\t\tnfsd_permission(struct svc_cred *cred, struct svc_export *exp,\n \t\t\t\tstruct dentry *dentry, int acc);\n", "prefixes": [ "v11", "13/15" ] }