[PATCH v7 07/16] ext4: Report case sensitivity in fileattr_get
STALE251d
REVIEWED: 9 (9M)
From: Chuck Lever <cel@kernel.org>
Date: 2026-01-22 16:03:34
Also in:
linux-api, linux-cifs, linux-f2fs-devel, linux-fsdevel, linux-nfs, linux-xfs
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
Revision v7 of 11 in this series; 1 review trailer (1 from subsystem maintainers).
Revisions (11)
From: Chuck Lever <redacted> Report ext4's case sensitivity behavior via the FS_XFLAG_CASEFOLD flag. ext4 always preserves case at rest. Case sensitivity is a per-directory setting in ext4. If the queried inode is a casefolded directory, report case-insensitive; otherwise report case-sensitive (standard POSIX behavior). Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Chuck Lever <redacted> --- fs/ext4/ioctl.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 7ce0fc40aec2..462da7aadc80 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c@@ -996,6 +996,13 @@ int ext4_fileattr_get(struct dentry *dentry, struct file_kattr *fa) if (ext4_has_feature_project(inode->i_sb)) fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid); + /* + * Case folding is a directory attribute in ext4. Set FS_XFLAG_CASEFOLD + * for directories with the casefold attribute; all other inodes use + * standard case-sensitive semantics. + */ + if (IS_CASEFOLDED(inode)) + fa->fsx_xflags |= FS_XFLAG_CASEFOLD; return 0; }
--
2.52.0