[PATCH v9 4/4] ext4: Use generic casefolding support

[Eric Biggers]

On Tue, Jun 23, 2020 at 09:33:41PM -0700, Daniel Rosenberg wrote:
> This switches ext4 over to the generic support provided in
> commit 5f829feca774 ("fs: Add standard casefolding support")

Commit IDs aren't determined until the patches are applied.  It's possible for
the person applying the patches to fix them, but in general people will forget,
so it's better not to include non-stable commit IDs.

Also, a sentence explaining *why* this change is good would be helpful.
Commit messages should always have a *why* unless it's obvious.

Likewise for the f2fs commit.

- Eric