linux-ext4 - Re: [PATCH] ext4: fix race between ext4_sync

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Message-ID: <20200522033437.GA895@sol.localdomain>
Date:   Thu, 21 May 2020 20:34:37 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-ext4@...r.kernel.org
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>, linux-fsdevel@...r.kernel.org,
        Al Viro <viro@...iv.linux.org.uk>, stable@...r.kernel.org
Subject: Re: [PATCH] ext4: fix race between ext4_sync_parent() and rename()

On Wed, May 06, 2020 at 11:31:40AM -0700, Eric Biggers wrote:
>  		/*
>  		 * The directory inode may have gone through rmdir by now. But
>  		 * the inode itself and its blocks are still allocated (we hold
> -		 * a reference to the inode so it didn't go through
> -		 * ext4_evict_inode()) and so we are safe to flush metadata
> -		 * blocks and the inode.
> +		 * a reference to the inode via its dentry), so it didn't go
> +		 * through ext4_evict_inode()) and so we are safe to flush
> +		 * metadata blocks and the inode.
>  		 */
>  		ret = sync_mapping_buffers(inode->i_mapping);

Just realized that in this comment, the closing parenthesis I added after
"dentry" shouldn't be there.  Ted, feel free to fix this if you're so inclined.

- Eric