{"id":2227341,"url":"http://patchwork.ozlabs.org/api/patches/2227341/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260423-case-sensitivity-v10-17-c385d674a6cf@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":"<20260423-case-sensitivity-v10-17-c385d674a6cf@oracle.com>","list_archive_url":null,"date":"2026-04-23T13:12:20","name":"[v10,17/17] ksmbd: Report filesystem case sensitivity via FS_ATTRIBUTE_INFORMATION","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"42053a45cb095877e6776e8fdc4f19e488431b62","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/20260423-case-sensitivity-v10-17-c385d674a6cf@oracle.com/mbox/","series":[{"id":501195,"url":"http://patchwork.ozlabs.org/api/series/501195/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=501195","date":"2026-04-23T13:12:06","name":"Exposing case folding behavior","version":10,"mbox":"http://patchwork.ozlabs.org/series/501195/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227341/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2227341/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=K4OLhQiL;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","Message-Id":"<20260423-case-sensitivity-v10-17-c385d674a6cf@oracle.com>","References":"<20260423-case-sensitivity-v10-0-c385d674a6cf@oracle.com>","In-Reply-To":"<20260423-case-sensitivity-v10-0-c385d674a6cf@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=2582;\n i=chuck.lever@oracle.com; h=from:subject:message-id;\n bh=/M15phZsxO4dYF/kfeaMD4laDtLmxamo65xsRXL/kkg=;\n b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp6hq0lrMRP/taRhAjVj2Nj34LkMZtiUQ1WGFUj\n 5GhhBTIsAWJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCaeoatAAKCRAzarMzb2Z/\n l7+iD/9RTr4hntMPxhl7UX1Xa9+pHwyzL17Hm9T+TA6M+p7usu+ddsGl6douosfJVOewO3FyoUV\n kUkhZBoIos+DHr5mWvcU/p0Bmt6IvhCdDIg7EkUJHbOUd+a821W9CDt9NGNwLdWnHU7rJATocLP\n 1IGEUvEUEm12ihgZPtNYLLOGf99q7H8f3fkR0RtAxSKaP3KkPkYO5IDkZJlqKdShfxbwU/l0IRD\n 3yb59efObNpfct0TPF9BY3UR/YAGA97NsvtptvyitXjtb65xeeFKZVJN7GyAGSkvQ8YFAxiYYLt\n SshlPCE3GLBxxGmAQBgkH56S67IiXI1kxMrddESmsTOExvc0rzaVvm97m9wYoLvy+dmt+12UBJ4\n WUGXgh41TFpWIt1+RYtZ/WBboC0B5IhkSou7z6IlksVYl5G8q/9fUAoQBM79v0B0bNbzWXWfq0a\n WjPFYvD3qovj8sX7CcfPXlXnNU0L40gt+MNRbNGtZjppbWixbTv77TAGbn51rxVQnTfulBLoDpF\n 4+VqzzCzM1XTKJCPYOETZ/yhXvjZZtNa5BQVaerGOMBIaCOC7yop2xyTiBOoMevYEA+qaoZzGqz\n 9+XTxfknXthMElnBLQC5JLn6zz/IHiwZx5awniQHRHH18z8MiIXnIbCjfrj92Owq7tSiKzrCsNU\n V1E030k7effzOsA==","X-Developer-Key":"i=chuck.lever@oracle.com; a=openpgp;\n fpr=28B2E5B01286DF243CF23EFE336AB3336F667F97"},"content":"From: Chuck Lever \n\nFS_ATTRIBUTE_INFORMATION responses have always reported\nFILE_CASE_SENSITIVE_SEARCH and FILE_CASE_PRESERVED_NAMES\nunconditionally. Case-insensitive filesystems like exFAT, and\ncasefolded directories on ext4 or f2fs, have no way to signal\ntheir actual semantics to SMB clients.\n\nNow that filesystems expose case behavior through ->fileattr_get,\nquery it via vfs_fileattr_get() and translate the FS_XFLAG_CASEFOLD\nand FS_XFLAG_CASENONPRESERVING flags into the corresponding SMB\nattributes. Filesystems without ->fileattr_get continue reporting\ndefault POSIX behavior (case-sensitive, case-preserving).\n\nSMB's FS_ATTRIBUTE_INFORMATION reports per-share attributes from\nthe share root, not per-file. Shares mixing casefold and\nnon-casefold directories report the root directory's behavior.\n\nAcked-by: Namjae Jeon \nSigned-off-by: Chuck Lever \n---\n fs/smb/server/smb2pdu.c | 25 +++++++++++++++++++------\n 1 file changed, 19 insertions(+), 6 deletions(-)","diff":"diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c\nindex ee32e61b6d3c..05245562bcb8 100644\n--- a/fs/smb/server/smb2pdu.c\n+++ b/fs/smb/server/smb2pdu.c\n@@ -14,6 +14,7 @@\n #include \n #include \n #include \n+#include \n \n #include \"glob.h\"\n #include \"smbfsctl.h\"\n@@ -5541,16 +5542,28 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,\n \tcase FS_ATTRIBUTE_INFORMATION:\n \t{\n \t\tFILE_SYSTEM_ATTRIBUTE_INFO *info;\n+\t\tstruct file_kattr fa = {};\n \t\tsize_t sz;\n+\t\tu32 attrs;\n+\t\tint err;\n \n \t\tinfo = (FILE_SYSTEM_ATTRIBUTE_INFO *)rsp->Buffer;\n-\t\tinfo->Attributes = cpu_to_le32(FILE_SUPPORTS_OBJECT_IDS |\n-\t\t\t\t\t FILE_PERSISTENT_ACLS |\n-\t\t\t\t\t FILE_UNICODE_ON_DISK |\n-\t\t\t\t\t FILE_CASE_PRESERVED_NAMES |\n-\t\t\t\t\t FILE_CASE_SENSITIVE_SEARCH |\n-\t\t\t\t\t FILE_SUPPORTS_BLOCK_REFCOUNTING);\n+\t\tattrs = FILE_SUPPORTS_OBJECT_IDS |\n+\t\t\tFILE_PERSISTENT_ACLS |\n+\t\t\tFILE_UNICODE_ON_DISK |\n+\t\t\tFILE_SUPPORTS_BLOCK_REFCOUNTING;\n \n+\t\terr = vfs_fileattr_get(path.dentry, &fa);\n+\t\tif (err && err != -ENOIOCTLCMD && err != -ENOTTY) {\n+\t\t\tpath_put(&path);\n+\t\t\treturn err;\n+\t\t}\n+\t\tif (!(fa.fsx_xflags & FS_XFLAG_CASEFOLD))\n+\t\t\tattrs |= FILE_CASE_SENSITIVE_SEARCH;\n+\t\tif (!(fa.fsx_xflags & FS_XFLAG_CASENONPRESERVING))\n+\t\t\tattrs |= FILE_CASE_PRESERVED_NAMES;\n+\n+\t\tinfo->Attributes = cpu_to_le32(attrs);\n \t\tinfo->Attributes |= cpu_to_le32(server_conf.share_fake_fscaps);\n \n \t\tif (test_share_config_flag(work->tcon->share_conf,\n","prefixes":["v10","17/17"]}