linux-kernel - Re: [PATCH v2 1/9] mm: Add msharefs filesystem

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Date:   Thu, 30 Jun 2022 23:57:39 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Khalid Aziz <khalid.aziz@...cle.com>
Cc:     akpm@...ux-foundation.org, willy@...radead.org,
        aneesh.kumar@...ux.ibm.com, arnd@...db.de, 21cnbao@...il.com,
        corbet@....net, dave.hansen@...ux.intel.com, david@...hat.com,
        ebiederm@...ssion.com, hagen@...u.net, jack@...e.cz,
        keescook@...omium.org, kirill@...temov.name, kucharsk@...il.com,
        linkinjeon@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        longpeng2@...wei.com, luto@...nel.org, markhemm@...glemail.com,
        pcc@...gle.com, rppt@...nel.org, sieberf@...zon.com,
        sjpark@...zon.de, surenb@...gle.com, tst@...oebel-theuer.de,
        yzaikin@...gle.com
Subject: Re: [PATCH v2 1/9] mm: Add msharefs filesystem

On Wed, Jun 29, 2022 at 04:53:52PM -0600, Khalid Aziz wrote:
> +static int
> +msharefs_d_hash(const struct dentry *dentry, struct qstr *qstr)
> +{
> +	unsigned long hash = init_name_hash(dentry);
> +	const unsigned char *s = qstr->name;
> +	unsigned int len = qstr->len;
> +
> +	while (len--)
> +		hash = partial_name_hash(*s++, hash);
> +	qstr->hash = end_name_hash(hash);
> +	return 0;
> +}

What do you need that for and how is it different from letting it
use full_name_hash() (which is what it will do if you leave
dentry_operations->d_hash equal to NULL)?