linux-ext4 - Re: [PATCH v4 3/7] libfs: Validate negative dentries in case-insensitive directories

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Message-ID: <20230729045156.GD4171@sol.localdomain>
Date:   Fri, 28 Jul 2023 21:51:56 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Gabriel Krisman Bertazi <krisman@...e.de>
Cc:     viro@...iv.linux.org.uk, brauner@...nel.org, tytso@....edu,
        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 v4 3/7] libfs: Validate negative dentries in
 case-insensitive directories

On Thu, Jul 27, 2023 at 01:28:39PM -0400, Gabriel Krisman Bertazi wrote:
> dentry->d_name is only checked by the case-insensitive d_revalidate hook
> in the LOOKUP_CREATE/LOOKUP_RENAME_TARGET case since, for these cases,
> d_revalidate is always called with the parent inode read-locked, and
> therefore the name cannot change from under us.

"at least read-locked"?  Or do you actually mean write-locked?

> +static inline int generic_ci_d_revalidate(struct dentry *dentry,
> +					  const struct qstr *name,
> +					  unsigned int flags)

No need for inline here.

- Eric