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

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Message-ID: <20230323143622.GE136146@mit.edu>
Date:   Thu, 23 Mar 2023 10:36:22 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     viro@...iv.linux.org.uk, jaegeuk@...nel.org, ebiggers@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel@...labora.com
Subject: Re: [PATCH 3/7] libfs: Validate negative dentries in
 case-insensitive directories

On Wed, Jun 22, 2022 at 03:45:59PM -0400, Gabriel Krisman Bertazi wrote:
> Introduce a dentry revalidation helper to be used by case-insensitive
> filesystems to check if it is safe to reuse a negative dentry.
> 
> A negative dentry is safe to be reused on a case-insensitive lookup if
> it was created during a case-insensitive lookup and this is not a lookup
> that will instantiate a dentry. If this is a creation lookup, we also
> need to make sure the name matches sensitively the name under lookup in
> order to assure the name preserving semantics.
> 
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>

Reviewed-by: Theodore Ts'o <tytso@....edu>