From: Ben Myers <bpm@sgi.com>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 1/9] xfs: separate buffer indexing from block map
Date: Mon, 18 Jun 2012 15:39:19 -0500 [thread overview]
Message-ID: <20120618203919.GW4721@sgi.com> (raw)
In-Reply-To: <1339133914-11148-2-git-send-email-david@fromorbit.com>
Hi Dave,
On Fri, Jun 08, 2012 at 03:38:26PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
>
> To support discontiguous buffers in the buffer cache, we need to
> separate the cache index variables from the I/O map. While this is
> currently a 1:1 mapping, discontiguous buffer support will break
> this relationship.
>
> However, for caching purposes, we can still treat them the same as a
> contiguous buffer - the block number of the first block and the
> length of the buffer - as that is still a unique representation.
> Also, the only way we will ever access the discontiguous regions of
> buffers is via bulding the complete buffer in the first place, so
> using the initial block number and entire buffer length is a sane
> way to index the buffers.
>
> Add a block mapping vector construct to the xfs_buf and use it in
> the places where we are doing IO instead of the current
> b_bn/b_length variables.
This patch does not apply even with Jan's patch. Merged it manually.
-Ben
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next prev parent reply other threads:[~2012-06-18 20:38 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-08 5:38 [PATCH 0/9] xfs: discontiguous directory buffer support Dave Chinner
2012-06-08 5:38 ` [PATCH 1/9] xfs: separate buffer indexing from block map Dave Chinner
2012-06-18 20:39 ` Ben Myers [this message]
2012-06-20 6:44 ` Christoph Hellwig
2012-06-20 7:36 ` Dave Chinner
2012-06-08 5:38 ` [PATCH 2/9] xfs: convert internal buffer functions to pass maps Dave Chinner
2012-06-18 20:43 ` Ben Myers
2012-06-18 21:07 ` Ben Myers
2012-06-19 7:15 ` Christoph Hellwig
2012-06-19 15:59 ` Ben Myers
2012-06-19 17:03 ` Christoph Hellwig
2012-06-19 17:11 ` Ben Myers
2012-06-20 5:56 ` Dave Chinner
2012-06-20 6:04 ` Christoph Hellwig
2012-06-20 6:29 ` Dave Chinner
2012-06-20 6:46 ` Dave Chinner
2012-06-20 15:39 ` Ben Myers
2012-06-20 15:36 ` Ben Myers
2012-06-20 23:04 ` Dave Chinner
2012-06-20 6:35 ` Dave Chinner
2012-06-20 15:48 ` Ben Myers
2012-06-20 6:29 ` Christoph Hellwig
2012-06-20 6:37 ` Dave Chinner
2012-06-20 15:51 ` Ben Myers
2012-06-20 6:48 ` Christoph Hellwig
2012-06-22 6:48 ` Dave Chinner
2012-06-08 5:38 ` [PATCH 3/9] xfs: add discontiguous buffer map interface Dave Chinner
2012-06-20 6:53 ` Christoph Hellwig
2012-06-08 5:38 ` [PATCH 4/9] xfs: add discontiguous buffer support to transactions Dave Chinner
2012-06-20 6:54 ` Christoph Hellwig
2012-06-08 5:38 ` [PATCH 5/9] xfs: struct xfs_buf_log_format isn't variable sized Dave Chinner
2012-06-20 6:36 ` Christoph Hellwig
2012-06-20 7:01 ` Dave Chinner
2012-06-20 7:05 ` Christoph Hellwig
2012-06-08 5:38 ` [PATCH 6/9] xfs: support discontiguous buffers in the xfs_buf_log_item Dave Chinner
2012-06-20 7:15 ` Christoph Hellwig
2012-06-08 5:38 ` [PATCH 7/9] xfs: use multiple irec xfs buf support in dabuf Dave Chinner
2012-06-20 7:18 ` Christoph Hellwig
2012-06-08 5:38 ` [PATCH 8/9] xfs: remove struct xfs_dabuf and infrastructure Dave Chinner
2012-06-20 7:20 ` Christoph Hellwig
2012-06-08 5:38 ` [PATCH 9/9] xfs: factor buffer reading from xfs_dir2_leaf_getdents Dave Chinner
2012-06-20 7:27 ` Christoph Hellwig
2012-06-20 7:41 ` Dave Chinner
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