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

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> @@ -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.

> +static inline int filemap_check_wb_err(struct address_space *mapping, errseq_t since)

Overly long line here (the patch has a few more)

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