Re: [PATCH 03/12] xfs: introduce a compound buffer construct

To:	Dave Chinner <david@xxxxxxxxxxxxx>
Subject:	Re: [PATCH 03/12] xfs: introduce a compound buffer construct
From:	Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date:	Sat, 17 Dec 2011 18:11:55 -0500
Cc:	xfs@xxxxxxxxxxx
In-reply-to:	<1323238703-13198-4-git-send-email-david@xxxxxxxxxxxxx>
References:	<1323238703-13198-1-git-send-email-david@xxxxxxxxxxxxx> <1323238703-13198-4-git-send-email-david@xxxxxxxxxxxxx>
User-agent:	Mutt/1.5.21 (2010-09-15)

> +struct xfs_buf_vec {
> +     xfs_daddr_t             bv_bn;  /* block number for I/O */
> +     size_t                  bv_len; /* size of I/O */
> +};
> +#define XB_VECS              2

Why do we embedd to of these by default?  In general we'd either have
one or a number much bigger than two here.

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[RFC, PATCH 0/12] xfs: compound buffers for directory blocks, Dave Chinner [PATCH 01/12] xfs: remove remaining scraps of struct xfs_iomap, Dave Chinner Re: [PATCH 01/12] xfs: remove remaining scraps of struct xfs_iomap, Christoph Hellwig [PATCH 02/12] xfs: clean up buffer get/read call API, Dave Chinner Re: [PATCH 02/12] xfs: clean up buffer get/read call API, Christoph Hellwig [PATCH 04/12] xfs: add compound buffer get and read interfaces, Dave Chinner Re: [PATCH 04/12] xfs: add compound buffer get and read interfaces, Christoph Hellwig [PATCH 06/12] xfs: convert xfs_da_do_buf to use irec buffer interface, Dave Chinner [PATCH 03/12] xfs: introduce a compound buffer construct, Dave Chinner Re: [PATCH 03/12] xfs: introduce a compound buffer construct, Christoph Hellwig <= [PATCH 08/12] xfs: support multiple irec maps in buffer code, Dave Chinner [PATCH 10/12] xfs: use multiple irec xfs buf support in dabuf, Dave Chinner [PATCH 09/12] xfs: support compund buffers in buf_item logging, Dave Chinner [PATCH 07/12] xfs: switch the buffer get/read API to use irec methods, Dave Chinner [PATCH 05/12] xfs: add irec interfaces to xfs_trans_buf_get/read, Dave Chinner [PATCH 12/12] xfs: remove duplication in transaction buffer operations, Dave Chinner Re: [PATCH 12/12] xfs: remove duplication in transaction buffer operations, Christoph Hellwig [PATCH 11/12] xfs: remove struct xfs_dabuf and infrastructure, Dave Chinner Re: [PATCH 11/12] xfs: remove struct xfs_dabuf and infrastructure, Christoph Hellwig Re: [RFC, PATCH 0/12] xfs: compound buffers for directory blocks, Christoph Hellwig

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