[{"id":3681672,"web_url":"http://patchwork.ozlabs.org/comment/3681672/","msgid":"","list_archive_url":null,"date":"2026-04-23T21:02:56","subject":"Re: [PATCH v10 10/17] cifs: Implement fileattr_get for case\n sensitivity","submitter":{"id":510,"url":"http://patchwork.ozlabs.org/api/people/510/","name":"Steve French","email":"smfrench@gmail.com"},"content":"Should this also be checking if the SMB3.1.1 Linux Extensions or SMB\nPOSIX Extensions are negotiated (ie the server supports case\nsensitivity)?\n\nOn Thu, Apr 23, 2026 at 8:20 AM Chuck Lever wrote:\n>\n> From: Chuck Lever \n>\n> Upper layers such as NFSD need a way to query whether a filesystem\n> handles filenames in a case-sensitive manner. Report CIFS/SMB case\n> handling behavior via the FS_XFLAG_CASEFOLD flag.\n>\n> CIFS servers (typically Windows or Samba) are usually case-insensitive\n> but case-preserving, meaning they ignore case during lookups but store\n> filenames exactly as provided.\n>\n> The implementation reports case sensitivity based on the nocase mount\n> option, which reflects whether the client expects the server to perform\n> case-insensitive comparisons. When nocase is set, the mount is reported\n> as case-insensitive.\n>\n> The callback is registered in all three inode_operations structures\n> (directory, file, and symlink) to ensure consistent reporting across\n> all inode types.\n>\n> Acked-by: Steve French \n> Signed-off-by: Chuck Lever \n> ---\n> fs/smb/client/cifsfs.c | 20 ++++++++++++++++++++\n> 1 file changed, 20 insertions(+)\n>\n> diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c\n> index 2025739f070a..9b70ffa3e01d 100644\n> --- a/fs/smb/client/cifsfs.c\n> +++ b/fs/smb/client/cifsfs.c\n> @@ -30,6 +30,7 @@\n> #include \n> #include \n> #include \n> +#include \n> #include \n> #include \n> #include \"cifsfs.h\"\n> @@ -1199,6 +1200,22 @@ struct file_system_type smb3_fs_type = {\n> MODULE_ALIAS_FS(\"smb3\");\n> MODULE_ALIAS(\"smb3\");\n>\n> +static int cifs_fileattr_get(struct dentry *dentry, struct file_kattr *fa)\n> +{\n> + struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);\n> + struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);\n> +\n> + /*\n> + * The nocase mount option installs case-insensitive dentry\n> + * operations on this superblock. SMB preserves case on the\n> + * wire and at rest, so the mount matches FS_XFLAG_CASEFOLD\n> + * semantics: case-folded lookup, verbatim storage.\n> + */\n> + if (tcon->nocase)\n> + fa->fsx_xflags |= FS_XFLAG_CASEFOLD;\n> + return 0;\n> +}\n> +\n> const struct inode_operations cifs_dir_inode_ops = {\n> .create = cifs_create,\n> .atomic_open = cifs_atomic_open,\n> @@ -1217,6 +1234,7 @@ const struct inode_operations cifs_dir_inode_ops = {\n> .listxattr = cifs_listxattr,\n> .get_acl = cifs_get_acl,\n> .set_acl = cifs_set_acl,\n> + .fileattr_get = cifs_fileattr_get,\n> };\n>\n> const struct inode_operations cifs_file_inode_ops = {\n> @@ -1227,6 +1245,7 @@ const struct inode_operations cifs_file_inode_ops = {\n> .fiemap = cifs_fiemap,\n> .get_acl = cifs_get_acl,\n> .set_acl = cifs_set_acl,\n> + .fileattr_get = cifs_fileattr_get,\n> };\n>\n> const char *cifs_get_link(struct dentry *dentry, struct inode *inode,\n> @@ -1261,6 +1280,7 @@ const struct inode_operations cifs_symlink_inode_ops = {\n> .setattr = cifs_setattr,\n> .permission = cifs_permission,\n> .listxattr = cifs_listxattr,\n> + .fileattr_get = cifs_fileattr_get,\n> };\n>\n> /*\n>\n> --\n> 2.53.0\n>\n>","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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=rDvAu1SN;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; 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Thu, 23 Apr 2026\n 14:03:07 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260423-case-sensitivity-v10-0-c385d674a6cf@oracle.com>\n <20260423-case-sensitivity-v10-10-c385d674a6cf@oracle.com>","In-Reply-To":"<20260423-case-sensitivity-v10-10-c385d674a6cf@oracle.com>","From":"Steve French ","Date":"Thu, 23 Apr 2026 16:02:56 -0500","X-Gm-Features":"AQROBzDF43-id-Qgk6rRbL0HPyUPTg1w8GYo4-J0uBb2d6IfD5ElWAtE-TtbFxA","Message-ID":"\n ","Subject":"Re: [PATCH v10 10/17] cifs: Implement fileattr_get for case\n sensitivity","To":"Chuck Lever ","Cc":"Al Viro , Christian Brauner ,\n Jan Kara ,\n\tlinux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,\n\tlinux-xfs@vger.kernel.org, linux-cifs@vger.kernel.org,\n\tlinux-nfs@vger.kernel.org, linux-api@vger.kernel.org,\n\tlinux-f2fs-devel@lists.sourceforge.net, hirofumi@mail.parknet.co.jp,\n\tlinkinjeon@kernel.org, sj1557.seo@samsung.com, yuezhang.mo@sony.com,\n\talmaz.alexandrovich@paragon-software.com, slava@dubeyko.com,\n\tglaubitz@physik.fu-berlin.de, frank.li@vivo.com, tytso@mit.edu,\n\tadilger.kernel@dilger.ca, cem@kernel.org, sfrench@samba.org,\n pc@manguebit.org,\n\tronniesahlberg@gmail.com, sprasad@microsoft.com, trondmy@kernel.org,\n\tanna@kernel.org, jaegeuk@kernel.org, chao@kernel.org, hansg@kernel.org,\n\tsenozhatsky@chromium.org, Chuck Lever ,\n\tSteve French ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable"}},{"id":3682193,"web_url":"http://patchwork.ozlabs.org/comment/3682193/","msgid":"","list_archive_url":null,"date":"2026-04-24T20:37:45","subject":"Re: [PATCH v10 10/17] cifs: Implement fileattr_get for case\n sensitivity","submitter":{"id":510,"url":"http://patchwork.ozlabs.org/api/people/510/","name":"Steve French","email":"smfrench@gmail.com"},"content":"Looking at other flags that fileattr_fill_flags() can set would it\nmake sense to set\nFS_IMMUTABLE_FL and FS_APPEND_FL based on the smb ACL in the same new\nfunction cifs_fileattr_get()?\nWhat about about FS_NOATIME_FL?\n\nOn Thu, Apr 23, 2026 at 8:20 AM Chuck Lever wrote:\n>\n> From: Chuck Lever \n>\n> Upper layers such as NFSD need a way to query whether a filesystem\n> handles filenames in a case-sensitive manner. Report CIFS/SMB case\n> handling behavior via the FS_XFLAG_CASEFOLD flag.\n>\n> CIFS servers (typically Windows or Samba) are usually case-insensitive\n> but case-preserving, meaning they ignore case during lookups but store\n> filenames exactly as provided.\n>\n> The implementation reports case sensitivity based on the nocase mount\n> option, which reflects whether the client expects the server to perform\n> case-insensitive comparisons. When nocase is set, the mount is reported\n> as case-insensitive.\n>\n> The callback is registered in all three inode_operations structures\n> (directory, file, and symlink) to ensure consistent reporting across\n> all inode types.\n>\n> Acked-by: Steve French \n> Signed-off-by: Chuck Lever \n> ---\n> fs/smb/client/cifsfs.c | 20 ++++++++++++++++++++\n> 1 file changed, 20 insertions(+)\n>\n> diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c\n> index 2025739f070a..9b70ffa3e01d 100644\n> --- a/fs/smb/client/cifsfs.c\n> +++ b/fs/smb/client/cifsfs.c\n> @@ -30,6 +30,7 @@\n> #include \n> #include \n> #include \n> +#include \n> #include \n> #include \n> #include \"cifsfs.h\"\n> @@ -1199,6 +1200,22 @@ struct file_system_type smb3_fs_type = {\n> MODULE_ALIAS_FS(\"smb3\");\n> MODULE_ALIAS(\"smb3\");\n>\n> +static int cifs_fileattr_get(struct dentry *dentry, struct file_kattr *fa)\n> +{\n> + struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);\n> + struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);\n> +\n> + /*\n> + * The nocase mount option installs case-insensitive dentry\n> + * operations on this superblock. SMB preserves case on the\n> + * wire and at rest, so the mount matches FS_XFLAG_CASEFOLD\n> + * semantics: case-folded lookup, verbatim storage.\n> + */\n> + if (tcon->nocase)\n> + fa->fsx_xflags |= FS_XFLAG_CASEFOLD;\n> + return 0;\n> +}\n> +\n> const struct inode_operations cifs_dir_inode_ops = {\n> .create = cifs_create,\n> .atomic_open = cifs_atomic_open,\n> @@ -1217,6 +1234,7 @@ const struct inode_operations cifs_dir_inode_ops = {\n> .listxattr = cifs_listxattr,\n> .get_acl = cifs_get_acl,\n> .set_acl = cifs_set_acl,\n> + .fileattr_get = cifs_fileattr_get,\n> };\n>\n> const struct inode_operations cifs_file_inode_ops = {\n> @@ -1227,6 +1245,7 @@ const struct inode_operations cifs_file_inode_ops = {\n> .fiemap = cifs_fiemap,\n> .get_acl = cifs_get_acl,\n> .set_acl = cifs_set_acl,\n> + .fileattr_get = cifs_fileattr_get,\n> };\n>\n> const char *cifs_get_link(struct dentry *dentry, struct inode *inode,\n> @@ -1261,6 +1280,7 @@ const struct inode_operations cifs_symlink_inode_ops = {\n> .setattr = cifs_setattr,\n> .permission = cifs_permission,\n> .listxattr = cifs_listxattr,\n> + .fileattr_get = cifs_fileattr_get,\n> };\n>\n> /*\n>\n> --\n> 2.53.0\n>\n>","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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=KYeGbIhD;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.232.135.74; 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