linux-ext4 - Re: [f2fs-dev] [PATCH v6 0/9] Support negative dentries on case-insensitive ext4 and f2fs

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Date: Tue, 28 Nov 2023 00:02:46 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Gabriel Krisman Bertazi <gabriel@...sman.be>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>, tytso@....edu,
	linux-f2fs-devel@...ts.sourceforge.net, ebiggers@...nel.org,
	linux-fsdevel@...r.kernel.org, jaegeuk@...nel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH v6 0/9] Support negative dentries on
 case-insensitive ext4 and f2fs

On Fri, Nov 24, 2023 at 10:20:39AM -0500, Gabriel Krisman Bertazi wrote:

> I'm not sure why it changed.  I'm guessing that, since it doesn't make
> sense to set fscrypt_d_revalidate for every dentry in the
> !case-insensitive case, they just kept the same behavior for
> case-insensitive+fscrypt.  This is what I get from looking at the git
> history.
> 
> I will get a new series reverting to use ->s_d_op, folding the
> dentry_cmp behavior you mentioned, and based on what you merge in your
> branch.

FWIW, I suspect that we might want something along the lines of
d_set_always_valid(dentry)
{
	grab ->d_lock
	clear DCACHE_OP_REVALIDATE
	release ->d_lock
}

to make it possible to suppress ->d_revalidate() for this particular
dentry...