Re: [PATCH 1/2] ext4: Fix assertion in ext4_add_complete_io()

[Eric Whitney <enwlinux@gmail.com>]

* Jan Kara <jack@suse.cz>:
> It doesn't make sense to require io_end->handle when we are in nojournal
> mode. So update the assertion accordingly to avoid false warnings from
> ext4_add_complete_io().
> 
> Reported-by: Eric Whitney <enwlinux@gmail.com>
> Signed-off-by: Jan Kara <jack@suse.cz>
> ---
>  fs/ext4/page-io.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
> index d7d0c7b46ed4..d488f80ee32d 100644
> --- a/fs/ext4/page-io.c
> +++ b/fs/ext4/page-io.c
> @@ -197,14 +197,15 @@ static void dump_completed_IO(struct inode *inode, struct list_head *head)
>  static void ext4_add_complete_io(ext4_io_end_t *io_end)
>  {
>  	struct ext4_inode_info *ei = EXT4_I(io_end->inode);
> +	struct ext4_sb_info *sbi = EXT4_SB(io_end->inode->i_sb);
>  	struct workqueue_struct *wq;
>  	unsigned long flags;
>  
>  	/* Only reserved conversions from writeback should enter here */
>  	WARN_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN));
> -	WARN_ON(!io_end->handle);
> +	WARN_ON(!io_end->handle && sbi->s_journal);
>  	spin_lock_irqsave(&ei->i_completed_io_lock, flags);
> -	wq = EXT4_SB(io_end->inode->i_sb)->rsv_conversion_wq;
> +	wq = sbi->rsv_conversion_wq;
>  	if (list_empty(&ei->i_rsv_conversion_list))
>  		queue_work(wq, &ei->i_rsv_conversion_work);
>  	list_add_tail(&io_end->list, &ei->i_rsv_conversion_list);
> -- 
> 1.8.1.4
> 
> --

I've successfully tested this patch against 3.12-rc5 - it silences the 
warning triggered by ext4/271 in xfstests-bld's dioread_nolock test config.

Thanks very much!
Eric