linux-kernel - Re: [patch 2/2] HFS+: Add custom dentry hash and comparison operations

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Date:	Mon, 25 Jun 2007 22:01:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Duane Griffin <duaneg@...da.com>, linux-kernel@...r.kernel.org,
	didier <did447@...il.com>, Solra Bizna <sbizna@...at.net>,
	Daniel Drake <dsd@...too.org>
Subject: Re: [patch 2/2] HFS+: Add custom dentry hash and comparison
 operations

On Mon, 25 Jun 2007 14:17:19 +0200 (CEST) Roman Zippel <zippel@...ux-m68k.org> wrote:

> +/*
> + * Hash a string to an integer as appropriate for the HFS+ filesystem.
> + * Composed unicode characters are decomposed and case-folding is performed
> + * if the appropriate bits are (un)set on the superblock.
> + */
> +int hfsplus_hash_dentry(struct dentry *dentry, struct qstr *str)
> +{
> +	struct super_block *sb = dentry->d_sb;
> +	const char *astr;
> +	const u16 *dstr;
> +	int casefold, decompose, size, dsize, len;
> +	unsigned long hash;
> +	wchar_t c;
> +	u16 c2;
> +
> +	casefold = (HFSPLUS_SB(sb).flags & HFSPLUS_SB_CASEFOLD);
> +	decompose = !(HFSPLUS_SB(sb).flags & HFSPLUS_SB_NODECOMPOSE);
> +	hash = init_name_hash();
> +	astr = str->name;
> +	len = str->len;
> +	while (len > 0) {
> +		size = asc2unichar(sb, astr, len, &c);
> +		astr += size;
> +		len -= size;
> +
> +		if (decompose && (dstr = decompose_unichar(c, &dsize))) {
> +			do {
> +				c2 = *dstr++;
> +				if (!casefold || (c2 = case_fold(c2)))
> +					hash = partial_name_hash(c2, hash);
> +			} while (--dsize > 0);

Are you really sure that we cannot start this loop with dsize==0?  This isn't
obviously true to these bleary eyes.

> +		} else {
> +			c2 = c;
> +			if (!casefold || (c2 = case_fold(c2)))
> +				hash = partial_name_hash(c2, hash);
> +		}
> +	}
> +	str->hash = end_name_hash(hash);
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