{"id":2228053,"url":"http://patchwork.ozlabs.org/api/patches/2228053/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260424-case-sensitivity-v11-3-de5619beddaf@oracle.com/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/projects/8/?format=json","name":"Linux ext4 filesystem development","link_name":"linux-ext4","list_id":"linux-ext4.vger.kernel.org","list_email":"linux-ext4@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260424-case-sensitivity-v11-3-de5619beddaf@oracle.com>","list_archive_url":null,"date":"2026-04-25T01:53:05","name":"[v11,03/15] fat: Implement fileattr_get for case sensitivity","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"1d8f367147fed5b62126d0cfda53dfd9896b6c29","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-ext4/patch/20260424-case-sensitivity-v11-3-de5619beddaf@oracle.com/mbox/","series":[{"id":501417,"url":"http://patchwork.ozlabs.org/api/series/501417/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/list/?series=501417","date":"2026-04-25T01:53:02","name":"Exposing case folding behavior","version":11,"mbox":"http://patchwork.ozlabs.org/series/501417/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2228053/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2228053/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@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=D4qk4AkE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=150.107.74.76; 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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=1777082011;\n\tbh=pBCWUN3OSiUW7I9nPUu7uvwOxp1v5GKJDAB26ES+SYk=;\n\th=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n\tb=D4qk4AkE7oSFnf4Jvq/y7c4xEf3tjCG2rgMBf+IU04NBrvMnPmKRSPp4qPFVDrwSD\n\t AmvjItLdloS0U3Ni+aPzT7uwIQ+MlgKhHu03SxAce3WJ+ax9GqX7sKNTfY6u34GM8r\n\t mRF0tgsMSUbFmyYUoc1S2sA/WUjPeIQpB6stkip8jQ+unQMLzeR5gNJkmxb5CbeghO\n\t 82ZYbDjZ+LxYBJmiBPCv0s7/SPT0ifZgCMxmlJXVUlBjpDPQm2V9M3G+qJ3QqFTD+P\n\t 1/gbuYDBOoJ6tkmqLyMJdMDLGJtkwZbgi+kpfqqO3jiYSIcC30znq/91rDVQscwQcm\n\t rVrvCTNuzgt7w==","From":"Chuck Lever ","Date":"Fri, 24 Apr 2026 21:53:05 -0400","Subject":"[PATCH v11 03/15] fat: Implement fileattr_get for case sensitivity","Precedence":"bulk","X-Mailing-List":"linux-ext4@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":"<20260424-case-sensitivity-v11-3-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=4228;\n i=chuck.lever@oracle.com; h=from:subject:message-id;\n bh=dPugPRnI00tHA3cNW8ONYKia0dTUR/UZPGzdguKMQzc=;\n b=owEBbQKS/ZANAwAKATNqszNvZn+XAcsmYgBp7B6Qxo4uOWM4xFfpqrQHluNKAKVK0C93S476E\n /LGltNcVsWJAjMEAAEKAB0WIQQosuWwEobfJDzyPv4zarMzb2Z/lwUCaewekAAKCRAzarMzb2Z/\n l8usD/9PCRPBRYN98pTodu0f0mBGZ5OO81ysCDKC8kgw6t/9/ZNlQ4x8Xtl/Z97f1OTwKPRAALy\n +jQrDQG1CyjUHhUGJ8tgdgV7RY9/2jnUe0ZEYc+1KuugpADehU8qsB7g7ztbessVE6cZGcOR+9J\n 9J0e6h4sX/ftsrGbFgTqIsuiAXCpVDz48j094QMpvLz5I2QztbzB/BzedFPyG4WT66lZ3uI8x5+\n /lSrW8kE6+fHzPvkrqJJ1gBrfu9uf1+k1cHkhgKcgX3dcMUwvv86xq6mq/BwU+zHWdh4e1KItU/\n SE7dyerr9K8yLzuFM3gXg3tRDZvKMtkY27L3XtnjMUE3JUyYU4ZHOJgsjH8ryAYrqG7tSWDS7Y1\n Uxb2eQdSfRYrXX6qDnb+S6vO0z8R+QJK89LMN7bN1iJikXXfK9fByhgMUhfjVxPgmH7cqcA1pwk\n COKpkEVy/iaeJt8i3wPwpggEboCFXJsiIOjZQYgtO3YODDT/cSuf+VfPFNVFDBi+HpFyJfJsSIC\n wMH1e2uHdCHCXlbmgrWnIvbBsuVzmQ6CrNA3pTxP8LW9Di2THl+NOVMkMrMY4KqC6NbHuaNQkmI\n LQqscbHc63LkeXUukmNczivEnBWfLBjIYQZDFYZd0cwF0/m7er80gEz1UZDEqRDK3bZCNLt9kx+\n +b6vyZvntGYTYcw==","X-Developer-Key":"i=chuck.lever@oracle.com; a=openpgp;\n fpr=28B2E5B01286DF243CF23EFE336AB3336F667F97","X-Spam-Status":"No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"},"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 | 32 ++++++++++++++++++++++++++++++++\n fs/fat/namei_msdos.c | 1 +\n fs/fat/namei_vfat.c | 1 +\n 4 files changed, 37 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..5f0178fc2ede 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 +399,36 @@ 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+\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 +606,6 @@ 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":["v11","03/15"]}