case-insensitive updates for 6.9

- Patch case-insensitive lookup by trying the case-exact comparison
first, before falling back to costly utf8 casefolded comparison.

- Fix to forbid using a case-insensitive directory as part of an
overlayfs mount.

- Patchset to ensure d_op are set at d_alloc time for fscrypt and
casefold volumes, ensuring filesystem dentries will all have the correct
ops, whether they come from a lookup or not.
libfs: Drop generic_set_encrypted_ci_d_ops

No filesystems depend on it anymore, and it is generally a bad idea.
Since all dentries should have the same set of dentry operations in
case-insensitive capable filesystems, it should be propagated through
->s_d_op.

Reviewed-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20240221171412.10710-11-krisman@suse.de
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
2 files changed