Re: [PATCH v2 2/2] f2fs: Advertise encrypted casefolding in sysfs

[Theodore Ts'o]

On Thu, Jun 03, 2021 at 10:38:48PM -0700, Jaegeuk Kim wrote:
 > > Yes, but in the on-disk case, encrypted_casefold is redundant because it simply
> > means encrypt && casefold.  There is no encrypted_casefold flag on-disk.
> 
> I prefer to keep encrypted_casefold likewise kernel feature, which is more
> intuitive to users.

At least for ext4, there are kernel vesions which support encryption
and casefold *separetely*, but which do not support the file systems
that have encryption and casefold enabled simultaneously.  This is why
I had added /sys/fs/ext4/features/encrypted_casefold.  It was
originally not to indicate whether the on-disk file system supported
those features, but to indicate that the kernel in question supported
both features being enabled simultaneously.

					- Ted