linux-ext4 - Re: [PATCH v6 3/9] fs: Expose name under lookup to d

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Date: Wed, 22 Nov 2023 20:59:26 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Gabriel Krisman Bertazi <krisman@...e.de>
Cc: brauner@...nel.org, tytso@....edu, ebiggers@...nel.org,
	jaegeuk@...nel.org, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
	Gabriel Krisman Bertazi <krisman@...labora.com>
Subject: Re: [PATCH v6 3/9] fs: Expose name under lookup to d_revalidate hooks

On Wed, Aug 16, 2023 at 01:07:57AM -0400, Gabriel Krisman Bertazi wrote:
> From: Gabriel Krisman Bertazi <krisman@...labora.com>
> 
> Negative dentries support on case-insensitive ext4/f2fs will require
> access to the name under lookup to ensure it matches the dentry.  This
> adds the information on d_revalidate and updates its implementation.

There's actually one hell of a stronger reason for that particular change;
uses of ->d_name in ->d_revalidate() instances are often racy.

So IMO this is the right way to go, regardless of c-i stuff, except that
it ought to be followed by making individual ->d_revalidate() instances use
the damn argument, now that they have it in stable form.

Said followups don't need to be in the same series, obviously.