{"id":2232055,"url":"http://patchwork.ozlabs.org/api/patches/2232055/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260502-case-sensitivity-v13-3-aa853140311f@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":"<20260502-case-sensitivity-v13-3-aa853140311f@oracle.com>","list_archive_url":null,"date":"2026-05-02T14:20:48","name":"[v13,03/15] fat: Implement fileattr_get for case sensitivity","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"42434c8afb802003c4f4e6bfc73367ebfa3f5f88","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/20260502-case-sensitivity-v13-3-aa853140311f@oracle.com/mbox/","series":[{"id":502530,"url":"http://patchwork.ozlabs.org/api/series/502530/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=502530","date":"2026-05-02T14:20:45","name":"Exposing case folding behavior","version":13,"mbox":"http://patchwork.ozlabs.org/series/502530/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2232055/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2232055/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=mF7HURzM;\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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a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1777731690; cv=none;\n b=tlR+upqDIDCEO9Gdcnt7qa/w0hNsw1Ek7QjEtXkZqhlhdBB9+pEcIuDtUSj2AAVyEZa7zGxmKGCSdX2i5DQ09lCjpt/QgXCI4naRn7dwOSD0gw9Cfnx8cOWM2FNdayacJ/AgDQIj+4s+JtsAGkVMExQpTU8lSegmUJFyyInk1NU=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777731690; c=relaxed/simple;\n\tbh=VR5IPc+tFJzycK0UcE5Jbwk0EDkpbGyJE15n77IJHGE=;\n\th=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References:\n\t In-Reply-To:To:Cc;\n b=ubCJNT+3fPeWdZM2ocEbEg48CckX6UXYhMbdAnsoxukhVPs862K48ZYDGoYw1EfmIg/xyZ2sta5ZS/XBKD9RH1dPd1+lWmvUaxBNtOu9v4ocmza+4uZTN18oX4bi+hqL7EI2B9hufqhtoDzRj6gEIXvECo6cQfKMjHn9CtYRvek=","ARC-Authentication-Results":"i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=mF7HURzM; 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=1777731689;\n\tbh=VR5IPc+tFJzycK0UcE5Jbwk0EDkpbGyJE15n77IJHGE=;\n\th=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n\tb=mF7HURzMVcc76AIdcJ4gN+EjOH3PvQ+JAuxCubIcHZ3DqTATPTmSOPz/jj0c5a8eD\n\t 28ZXs+L6pe/biOR5DUyWkJHPJDw5dleKQ/IRG0xh1H5xyiuhhLw3v4NcwXJX/tNmPl\n\t slpIdOSJ4IBOx6SCzJ67PwcS8rkOVM4CDrlRuUhzIXbtan473DhGspkciBPe0VevA6\n\t Rp2ocOlWAHkGCdsO0j9rfVlgh+qZXcwWH5E8UI5KU1WwF5OW0XNdX1C6+y6HCJAWle\n\t 4bcHP6g4kfp77H3pKtZwKEQurPLu3aTximYGPcgJm6eEg/e7hAw1UNnz826iFUl/eL\n\t q1+/gmUdmiL+A==","From":"Chuck Lever ","Date":"Sat, 02 May 2026 10:20:48 -0400","Subject":"[PATCH v13 03/15] fat: Implement fileattr_get for case sensitivity","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","Message-Id":"<20260502-case-sensitivity-v13-3-aa853140311f@oracle.com>","References":"<20260502-case-sensitivity-v13-0-aa853140311f@oracle.com>","In-Reply-To":"<20260502-case-sensitivity-v13-0-aa853140311f@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=4362;\n i=chuck.lever@oracle.com; h=from:subject:message-id;\n bh=9b+u/mWoEz9peMeExQH28HkC0yIPxzHosHi0xcms5fc=;\n b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp9ghQ1BYK25WvfFyqzaHIDtV9hFSfc8aMAu7+E\n /AjIghIsY2JAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCafYIUAAKCRAzarMzb2Z/\n l+sCEACEwFRDD4cEH+PMA/LESHjhccu/7sgZ/W4dO0ReHcgG6q8I3VlIBGNwySJb3aQT6tPBR2P\n 3fEALKs5vj4BcjwnQ/T7wi6mwonrIzt3/H+9ZpBO4ICDfo4eylvEsjK07IBWs6+VZrJSZM50aPO\n LCpBxPaF/SjqIgV5o3ECVcsngrUolIDiKCFzdZQZ7RQhKwwL62FAkCtT/F4VZK0MlnxVbmeafts\n i9IBGfkvqLlctMiKC8hRY8VkgQHfePgcxnt5Ls/dSqBQIayK1VGzji8MNrHvBQzltvnpG3JX9Ng\n 3d7SaNtBapC50AQ6O5E8D50xh3kD3/Q0Ug2WBke9rBQ1lujCwg+QLZrgBf8f9lGnCd1A5yuGuco\n kkWs7v7kK6Fkpptrz+W5oPDX5UZOv+sZY3trZiulaarYUDRjAnAU5eMnMZk4iD9avtCfSOu/t4M\n XDrmv8f9YTg829LpDEHZjaT7yjoax6U8UgWHZCuxo/Eh82T/uWHhqFBYmtnEpm8e5zzDlOYGVtV\n vLmTYoVy/zHK6VRD9YxUUgOMzcqBDdBwXp7Q/ftJiYg9aZoeOt+vX/FaauCtnkig073tY56kXP6\n eqxS31rR+BIHroVbUd7CHiXnToOhHWg25QOt1V9rfqvGyxziWOIrLyNKY8ExwBn9mYFIPwvAgNY\n 9+K8ozD0F9oABqw==","X-Developer-Key":"i=chuck.lever@oracle.com; a=openpgp;\n fpr=28B2E5B01286DF243CF23EFE336AB3336F667F97"},"content":"From: Chuck Lever \n\nReport FAT's case sensitivity behavior via the FS_XFLAG_CASEFOLD\nand FS_XFLAG_CASENONPRESERVING flags. FAT filesystems are\ncase-insensitive by default.\n\nMSDOS supports a 'nocase' mount option that enables case-sensitive\nbehavior; check this option when reporting case sensitivity.\n\nVFAT long filename entries preserve case; without VFAT, only\nuppercased 8.3 short names are stored. MSDOS with 'nocase' also\npreserves case since the name-formatting code skips upcasing when\n'nocase' is set. Check both options when reporting case preservation.\n\nReviewed-by: Jan Kara \nReviewed-by: Roland Mainz \nSigned-off-by: Chuck Lever \n---\n fs/fat/fat.h | 3 +++\n fs/fat/file.c | 36 ++++++++++++++++++++++++++++++++++++\n fs/fat/namei_msdos.c | 1 +\n fs/fat/namei_vfat.c | 1 +\n 4 files changed, 41 insertions(+)","diff":"diff --git a/fs/fat/fat.h b/fs/fat/fat.h\nindex 5a58f0bf8ce8..99ed9228a677 100644\n--- a/fs/fat/fat.h\n+++ b/fs/fat/fat.h\n@@ -10,6 +10,8 @@\n #include \n #include \n \n+struct file_kattr;\n+\n /*\n * vfat shortname flags\n */\n@@ -408,6 +410,7 @@ extern void fat_truncate_blocks(struct inode *inode, loff_t offset);\n extern int fat_getattr(struct mnt_idmap *idmap,\n \t\t const struct path *path, struct kstat *stat,\n \t\t u32 request_mask, unsigned int flags);\n+int fat_fileattr_get(struct dentry *dentry, struct file_kattr *fa);\n extern int fat_file_fsync(struct file *file, loff_t start, loff_t end,\n \t\t\t int datasync);\n \ndiff --git a/fs/fat/file.c b/fs/fat/file.c\nindex becccdd2e501..37e7049b4c8c 100644\n--- a/fs/fat/file.c\n+++ b/fs/fat/file.c\n@@ -17,6 +17,7 @@\n #include \n #include \n #include \n+#include \n #include \"fat.h\"\n \n static long fat_fallocate(struct file *file, int mode,\n@@ -398,6 +399,40 @@ void fat_truncate_blocks(struct inode *inode, loff_t offset)\n \tfat_flush_inodes(inode->i_sb, inode, NULL);\n }\n \n+int fat_fileattr_get(struct dentry *dentry, struct file_kattr *fa)\n+{\n+\tstruct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);\n+\tbool case_sensitive;\n+\n+\t/*\n+\t * FAT filesystems are case-insensitive by default. VFAT\n+\t * becomes case-sensitive when mounted with 'check=strict',\n+\t * which installs vfat_dentry_ops. MSDOS has no such option;\n+\t * its 'nocase' mount option selects case-sensitive matching.\n+\t *\n+\t * VFAT long filename entries preserve case. Without VFAT, only\n+\t * uppercased 8.3 short names are stored. MSDOS with 'nocase'\n+\t * also preserves case.\n+\t */\n+\tif (sbi->options.isvfat)\n+\t\tcase_sensitive = sbi->options.name_check == 's';\n+\telse\n+\t\tcase_sensitive = sbi->options.nocase;\n+\n+\tif (!case_sensitive) {\n+\t\tfa->fsx_xflags |= FS_XFLAG_CASEFOLD;\n+\t\tfa->flags |= FS_CASEFOLD_FL;\n+\t\tif (!sbi->options.isvfat)\n+\t\t\tfa->fsx_xflags |= FS_XFLAG_CASENONPRESERVING;\n+\t}\n+\tif (d_inode(dentry)->i_flags & S_IMMUTABLE) {\n+\t\tfa->fsx_xflags |= FS_XFLAG_IMMUTABLE;\n+\t\tfa->flags |= FS_IMMUTABLE_FL;\n+\t}\n+\treturn 0;\n+}\n+EXPORT_SYMBOL_GPL(fat_fileattr_get);\n+\n int fat_getattr(struct mnt_idmap *idmap, const struct path *path,\n \t\tstruct kstat *stat, u32 request_mask, unsigned int flags)\n {\n@@ -575,5 +610,6 @@ EXPORT_SYMBOL_GPL(fat_setattr);\n const struct inode_operations fat_file_inode_operations = {\n \t.setattr\t= fat_setattr,\n \t.getattr\t= fat_getattr,\n+\t.fileattr_get\t= fat_fileattr_get,\n \t.update_time\t= fat_update_time,\n };\ndiff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c\nindex 4cc65f330fb7..0fd2971ad4b1 100644\n--- a/fs/fat/namei_msdos.c\n+++ b/fs/fat/namei_msdos.c\n@@ -644,6 +644,7 @@ static const struct inode_operations msdos_dir_inode_operations = {\n \t.rename\t\t= msdos_rename,\n \t.setattr\t= fat_setattr,\n \t.getattr\t= fat_getattr,\n+\t.fileattr_get\t= fat_fileattr_get,\n \t.update_time\t= fat_update_time,\n };\n \ndiff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c\nindex 918b3756674c..e909447873e3 100644\n--- a/fs/fat/namei_vfat.c\n+++ b/fs/fat/namei_vfat.c\n@@ -1185,6 +1185,7 @@ static const struct inode_operations vfat_dir_inode_operations = {\n \t.rename\t\t= vfat_rename2,\n \t.setattr\t= fat_setattr,\n \t.getattr\t= fat_getattr,\n+\t.fileattr_get\t= fat_fileattr_get,\n \t.update_time\t= fat_update_time,\n };\n \n","prefixes":["v13","03/15"]}