linux-ext4 - Re: [PATCH 1/2] fs: dcache: Handle case-exact lookup in d_alloc

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Message-ID: <YVm1nEDgaI7pl1Jz@zeniv-ca.linux.org.uk>
Date:   Sun, 3 Oct 2021 13:52:28 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     Shreeya Patel <shreeya.patel@...labora.com>, tytso@....edu,
        adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH 1/2] fs: dcache: Handle case-exact lookup in
 d_alloc_parallel

On Fri, Oct 01, 2021 at 02:35:32PM -0400, Gabriel Krisman Bertazi wrote:

> I don't like the idea of having a flavor of a dentry comparison function
> that doesn't invoke d_compare.  In particular because d_compare might be
> used for all sorts of things, and this fix is really specific to the
> case-insensitive case.
> 
> Would it be possible to fold this change into generic_ci_d_compare?  If
> we could flag the dentry as part of a parallel lookup under the relevant
> condition, generic_ci_d_compare could simply return immediately in
> such case.

Not really - if anything, that's a property of d_alloc_parallel() call
done by d_add_ci(), not that of any of the dentries involved...