{"id":2228066,"url":"http://patchwork.ozlabs.org/api/patches/2228066/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260424-case-sensitivity-v11-13-de5619beddaf@oracle.com/","project":{"id":12,"url":"http://patchwork.ozlabs.org/api/projects/12/?format=json","name":"Linux CIFS Client","link_name":"linux-cifs-client","list_id":"linux-cifs.vger.kernel.org","list_email":"linux-cifs@vger.kernel.org","web_url":"","scm_url":"","webscm_url":"","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=json","name":"Chuck Lever","email":"cel@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260424-case-sensitivity-v11-13-de5619beddaf@oracle.com/mbox/","series":[{"id":501416,"url":"http://patchwork.ozlabs.org/api/series/501416/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=501416","date":"2026-04-25T01:53:02","name":"Exposing case folding behavior","version":11,"mbox":"http://patchwork.ozlabs.org/series/501416/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2228066/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2228066/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.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=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; 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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 ,\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=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"},"content":"From: Chuck Lever \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 \nSigned-off-by: Chuck Lever \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 \n #include \n #include \n+#include \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"]}