libfs: Attempt exact-match comparison first during casefolded lookup

Casefolded comparisons are (obviously) way more costly than a simple
memcmp.  Try the case-sensitive comparison first, falling-back to the
case-insensitive lookup only when needed.  This allows any exact-match
lookup to complete without having to walk the utf8 trie.

Note that, for strict mode, generic_ci_d_compare used to reject an
invalid UTF-8 string, which would now be considered valid if it
exact-matches the disk-name.  But, if that is the case, the filesystem
is corrupt.  More than that, it really doesn't matter in practice,
because the name-under-lookup will have already been rejected by
generic_ci_d_hash and we won't even get here.

The memcmp is safe under RCU because we are operating on str/len instead
of dentry->d_name directly, and the caller guarantees their consistency
between each other in __d_lookup_rcu_op_compare.

Link: https://lore.kernel.org/r/[email protected]
Suggested-by: Linus Torvalds <[email protected]>
Signed-off-by: Gabriel Krisman Bertazi <[email protected]>

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