{"id":2227008,"url":"http://patchwork.ozlabs.org/api/patches/2227008/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260422-case-sensitivity-v9-15-be023cc070e2@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":"<20260422-case-sensitivity-v9-15-be023cc070e2@oracle.com>","list_archive_url":null,"date":"2026-04-22T23:30:09","name":"[v9,15/17] nfsd: Report export case-folding via NFSv3 PATHCONF","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"a9bc07e03c2a00a62355313b1c02f5a0633c937e","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/20260422-case-sensitivity-v9-15-be023cc070e2@oracle.com/mbox/","series":[{"id":501130,"url":"http://patchwork.ozlabs.org/api/series/501130/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=501130","date":"2026-04-22T23:29:54","name":"Exposing case folding behavior","version":9,"mbox":"http://patchwork.ozlabs.org/series/501130/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227008/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2227008/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=dz44fPyd;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","Message-Id":"<20260422-case-sensitivity-v9-15-be023cc070e2@oracle.com>","References":"<20260422-case-sensitivity-v9-0-be023cc070e2@oracle.com>","In-Reply-To":"<20260422-case-sensitivity-v9-0-be023cc070e2@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 ","X-Mailer":"b4 0.16-dev","X-Developer-Signature":"v=1; a=openpgp-sha256; l=3878;\n i=chuck.lever@oracle.com; h=from:subject:message-id;\n bh=juRp4blv9ojCU/MUyMkY2Fl5PBdoFDwowaxo1HD05lg=;\n b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp6VoG+JawwK9p290E0a7LBrlInfJFhlzdK770B\n Hv5TvUc9U6JAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCaelaBgAKCRAzarMzb2Z/\n l98ED/9KVHvUdvOxjuHj6eDXGDXOukMyQMBqYd/4nVgR9WICjcEx0OaPehufMGGvHqVhjo0PHyW\n 1n4HwrECBDqNWHfSpno/7kTB9V44NzjHRWL8QMnkTtCVR7Bh9xAaviPQq+HFBIjFOrT1aO3yQ3C\n DT4pJPcfuBqwuq55DhC5mLlSsN3uFi1guka+zh2hR9xtPYkp9CNXDcWgCT2b7dF/XOuyAWXUIw+\n nrJMwUeIFlDg3F5HSoo+5GbMS0DZC0vCmFAYloBE1NikFeYcpFi4IkI/jy1gGzrETEgP5R4vuyE\n Io6PXt9UKUv5yPrwnOltKme9Rak0ZnvFIdfNy3jAQ1FKC+VZrBxW9xZ8lEocWpmAGWGtkDAgj5b\n H3SOsStX4iVb5cEJtSsg/OooEelOemSdxhbHkh6Dh4LOAyp8D223d7FxdYLITpAB3ZINiK7yyDh\n rnso15tIxahku3B1cVam9RUbrQSsbKCp3Q5gua7ifkkssx8K9uarn7utKh/I/7PadhGbwkDSiQU\n QFuNHgwbwm5QEBzOu1053LWfMX6kPqNlCKmrewWf/cpLr/l44X8mcYUimNtNd7/sf3DnVQSpEjc\n qvzFpQn4cNds1MslDXz9RRzRCCoMXGzjp7IGKmR73FrZ2ur15SMzTtcuWoWOVcCX5v9RjB601U/\n BUYdhIb430ZE3Uw==","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\nSigned-off-by: Chuck Lever \n---\n fs/nfsd/nfs3proc.c | 18 ++++++++++--------\n fs/nfsd/vfs.c | 29 +++++++++++++++++++++++++++++\n fs/nfsd/vfs.h | 3 +++\n 3 files changed, 42 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..6a7c6a691f2a 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 +2892,31 @@ 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+ * Returns 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+\tif (err && err != -ENOIOCTLCMD)\n+\t\treturn nfserrno(err);\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":["v9","15/17"]}