ext4: optimize case-insensitive lookups
Temporarily cache a casefolded version of the file name under lookup in ext4_filename, to avoid repeatedly casefolding it. I got up to 30% speedup on lookups of large directories (>100k entries), depending on the length of the string under lookup. Signed-off-by: NGabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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