Re: [PATCH v7 07/16] ext4: Report case sensitivity in fileattr_get
From: "Darrick J. Wong" <djwong@kernel.org>
Date: 2026-01-23 00:29:06
Also in:
linux-cifs, linux-ext4, linux-f2fs-devel, linux-fsdevel, linux-nfs, linux-xfs
On Thu, Jan 22, 2026 at 11:03:02AM -0500, Chuck Lever wrote:
quoted hunk ↗ jump to hunk
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;
Curious. Shouldn't the VFS set FS_XFLAG_CASEFOLD if the VFS casefolding flag is set? OTOH, there are more filesystems that apparently support casefolding (given the size of this patchset) than actually set S_CASEFOLD. I think I'm ignorant of something here... --D
return 0; } -- 2.52.0