linux-ext4 - Re: [PATCH 07/13] xfs: document the invalidate_bdev call in invalidate

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Message-ID: <20230810155350.GE28000@lst.de>
Date:   Thu, 10 Aug 2023 17:53:50 +0200
From:   Christoph Hellwig <hch@....de>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        ntfs3@...ts.linux.dev, linux-xfs@...r.kernel.org
Subject: Re: [PATCH 07/13] xfs: document the invalidate_bdev call in
 invalidate_bdev

On Wed, Aug 09, 2023 at 03:39:23PM -0700, Darrick J. Wong wrote:
> > +	 * read from the same page in the pagecache.
> > +	 *
> > +	 * The unmount writes updated inode metadata to disk directly.  The XFS
> > +	 * buffer cache does not use the bdev pagecache, nor does it invalidate
> > +	 * the pagecache on umount.  If the above scenario occurs, the pagecache
> 
> This sentence reads a little strangely, since "nor does it invalidate"
> would seem to conflict with the invalidate_bdev call below.  I suggest
> changing the verb a bit:
> 
> "The XFS buffer cache does not use the bdev pagecache, so it needs to
> invalidate that pagecache on unmount."

Agreed. I'll forward it to the original author of the sentence time
permitting :)