linux-ext4 - Re: [PATCH 1/2] ext4: don't increase iversion counter for ea

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Date:   Tue, 02 Aug 2022 07:58:11 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Lukas Czerner <lczerner@...hat.com>, linux-ext4@...r.kernel.org
Cc:     tytso@....edu, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/2] ext4: don't increase iversion counter for ea_inodes

On Thu, 2022-07-28 at 15:39 +0200, Lukas Czerner wrote:
> ea_inodes are using i_version for storing part of the reference count so
> we really need to leave it alone.
> 
> The problem can be reproduced by xfstest ext4/026 when iversion is
> enabled. Fix it by not calling inode_inc_iversion() for EXT4_EA_INODE_FL
> inodes in ext4_mark_iloc_dirty().
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> ---
>  fs/ext4/inode.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 84c0eb55071d..b76554124224 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -5717,7 +5717,12 @@ int ext4_mark_iloc_dirty(handle_t *handle,
>  	}
>  	ext4_fc_track_inode(handle, inode);
>  
> -	if (IS_I_VERSION(inode))
> +	/*
> +	 * ea_inodes are using i_version for storing reference count, don't
> +	 * mess with it
> +	 */
> +	if (IS_I_VERSION(inode) &&
> +	    !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL))
>  		inode_inc_iversion(inode);
>  
>  	/* the do_update_inode consumes one bh->b_count */

Reviewed-by: Jeff Layton <jlayton@...nel.org>