Description of problem:

The ext4 filesystem has supported case-insensitive filenames since kernel version 5.2. This needs the CONFIG_UNICODE kernel option to be enabled.

This feature is useful, for example, for allowing Samba to operate on large directories (e.g. millions of files), given that SMB is case-insensitive.

Version-Release number of selected component (if applicable):

all

How reproducible:

Wishlist, so always

Steps to Reproduce:
0. modprobe ext4
1.ls cat /sys/fs/ext4/features/casefold

Actual results:

ls: cannot access '/sys/fs/ext4/features/casefold': No such file or directory

Expected results:

File exists, indicating kernel was compiled with CONFIG_UNICODE=y.

Additional info:

/boot/config-5.14.0-162.6.1.el9_1.x86_86 (for example) has

1. CONFIG_UNICODE is not set