On 6/8/25 4:52 PM, Theodore Ts'o wrote: > On Sun, Jun 08, 2025 at 12:29:30PM -0400, Chuck Lever wrote: >> >> For some reason I thought case-insensitivity support was merged more >> recently than that. I recall it first appearing as a session at LSF in >> Park City, but maybe that one was in 2018. > > commit b886ee3e778ec2ad43e276fd378ab492cf6819b7 > Author: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxxxx> > Date: Thu Apr 25 14:12:08 2019 -0400 > > ext4: Support case-insensitive file name lookups > >> nfs(5) describes the lookupcache= mount option. It controls how the >> Linux NFS client caches positive and negative lookup results. > > Has anyone just tried it? It might just work. To create a > case-folded directory: > > # mke2fs -Fq -t ext4 -O casefold /dev/vdc > # mount /dev/vdc /vdc > # mkdir /vdc/casefold > # chattr +F /vdc/casefold > # cp /etc/issue /vdc/casefold/MaDNeSS > # cat /vdc/casefold/madness > > Then export the directory and mount it via NFS, and let us know how it > goes. I'm currently on a cruise ship so it's a bit harder for me to > do the experiment myself. :-) NFSD currently asserts that all exported file systems are case-sensitive and case-preserving (either via NFSv3 or NFSv4). There is very likely some additional work necessary. Ted, do you happen to know if there are any fstests that exercise case- insensitive lookups? I would not regard that simple test as "job done! put pencil down!" :-) -- Chuck Lever
