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exfat: Simplify exfat_utf8_d_hash() for code points above U+FFFF

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Function partial_name_hash() takes long type value into which can be stored
one Unicode code point. Therefore conversion from UTF-32 to UTF-16 is not
needed.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Git-commit: dddf7da3985ee144b46ee287e81e47b9ee8bb980
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: lixiang <lixiang@codeaurora.org>
This commit is contained in:
Pali Rohár 2021-02-10 14:55:04 +08:00 • committed by lixiang
commit abbeaaddc1
1 changed files with 2 additions and 8 deletions
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10
fs/exfat/namei.c
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@ -147,16 +147,10 @@ static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
return charlen;
/*
* Convert to UTF-16: code points above U+FFFF are encoded as
* surrogate pairs.
* exfat_toupper() works only for code points up to the U+FFFF.
*/
if (u > 0xFFFF) {
hash = partial_name_hash(exfat_high_surrogate(u), hash);
hash = partial_name_hash(exfat_low_surrogate(u), hash);
} else {
hash = partial_name_hash(exfat_toupper(sb, u), hash);
}
hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
hash);
}
qstr->hash = end_name_hash(hash);