linux-ext4 - Re: [PATCH v7 11/22] fs: new infrastructure for writeback error handling and reporting

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Date:   Tue, 20 Jun 2017 08:56:16 -0400
From:   Jeff Layton <jlayton@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...IV.linux.org.uk>, Jan Kara <jack@...e.cz>,
        tytso@....edu, axboe@...nel.dk, mawilcox@...rosoft.com,
        ross.zwisler@...ux.intel.com, corbet@....net,
        Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Carlos Maiolino <cmaiolino@...hat.com>,
        Eryu Guan <eguan@...hat.com>,
        David Howells <dhowells@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH v7 11/22] fs: new infrastructure for writeback error
 handling and reporting

On Tue, 2017-06-20 at 05:34 -0700, Christoph Hellwig wrote:
> > @@ -393,6 +394,7 @@ struct address_space {
> >  	gfp_t			gfp_mask;	/* implicit gfp mask for allocations */
> >  	struct list_head	private_list;	/* ditto */
> >  	void			*private_data;	/* ditto */
> > +	errseq_t		wb_err;
> >  } __attribute__((aligned(sizeof(long))));
> >  	/*
> >  	 * On most architectures that alignment is already the case; but
> > @@ -847,6 +849,7 @@ struct file {
> >  	 * Must not be taken from IRQ context.
> >  	 */
> >  	spinlock_t		f_lock;
> > +	errseq_t		f_wb_err;
> >  	atomic_long_t		f_count;
> >  	unsigned int 		f_flags;
> >  	fmode_t			f_mode;
> 
> Did you check the sizes of the structure before and after?
> These places don't look like holes in the packing, but there probably
> are some available.
> 

Yes. That one actually plugs a 4 byte hole in struct file on x86_64.

> > +static inline int filemap_check_wb_err(struct address_space *mapping, errseq_t since)
> 
> Overly long line here (the patch has a few more)
> 

Ok, I'll fix those up.

-- 
Jeff Layton <jlayton@...hat.com>