Re: [PATCH 17/19] xfs: simplify building the bio in xlog_write_iclog

["Darrick J. Wong" <djwong@kernel.org>]

On Wed, Apr 30, 2025 at 04:21:47PM -0500, Christoph Hellwig wrote:
> Use the bio_add_virt_nofail and bio_add_vmalloc helpers to abstract
> away the details of the memory allocation.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Nice cleanup!
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> ---
>  fs/xfs/xfs_log.c | 32 ++++++--------------------------
>  1 file changed, 6 insertions(+), 26 deletions(-)
> 
> diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
> index 980aabc49512..793468b4d30d 100644
> --- a/fs/xfs/xfs_log.c
> +++ b/fs/xfs/xfs_log.c
> @@ -1607,27 +1607,6 @@ xlog_bio_end_io(
>  		   &iclog->ic_end_io_work);
>  }
>  
> -static int
> -xlog_map_iclog_data(
> -	struct bio		*bio,
> -	void			*data,
> -	size_t			count)
> -{
> -	do {
> -		struct page	*page = kmem_to_page(data);
> -		unsigned int	off = offset_in_page(data);
> -		size_t		len = min_t(size_t, count, PAGE_SIZE - off);
> -
> -		if (bio_add_page(bio, page, len, off) != len)
> -			return -EIO;
> -
> -		data += len;
> -		count -= len;
> -	} while (count);
> -
> -	return 0;
> -}
> -
>  STATIC void
>  xlog_write_iclog(
>  	struct xlog		*log,
> @@ -1693,11 +1672,12 @@ xlog_write_iclog(
>  
>  	iclog->ic_flags &= ~(XLOG_ICL_NEED_FLUSH | XLOG_ICL_NEED_FUA);
>  
> -	if (xlog_map_iclog_data(&iclog->ic_bio, iclog->ic_data, count))
> -		goto shutdown;
> -
> -	if (is_vmalloc_addr(iclog->ic_data))
> -		flush_kernel_vmap_range(iclog->ic_data, count);
> +	if (is_vmalloc_addr(iclog->ic_data)) {
> +		if (!bio_add_vmalloc(&iclog->ic_bio, iclog->ic_data, count))
> +			goto shutdown;
> +	} else {
> +		bio_add_virt_nofail(&iclog->ic_bio, iclog->ic_data, count);
> +	}
>  
>  	/*
>  	 * If this log buffer would straddle the end of the log we will have
> -- 
> 2.47.2
> 
>