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ext4: optimize case-insensitive lookups

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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: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Gabriel Krisman Bertazi 2019-06-19 23:45:09 -04:00 • committed by Theodore Ts'o
parent b03755ad6f
commit 3ae72562ad
5 changed files with 106 additions and 9 deletions
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3
include/linux/unicode.h
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@ -17,6 +17,9 @@ int utf8_strncmp(const struct unicode_map *um,
int utf8_strncasecmp(const struct unicode_map *um,
const struct qstr *s1, const struct qstr *s2);
int utf8_strncasecmp_folded(const struct unicode_map *um,
const struct qstr *cf,
const struct qstr *s1);
int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
unsigned char *dest, size_t dlen);