From: Dave Chinner <david@fromorbit.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH 03/11] xfs: remove ->b_offset handling for page backed buffers
Date: Thu, 20 May 2021 08:27:01 +1000 [thread overview]
Message-ID: <20210519222701.GB664593@dread.disaster.area> (raw)
In-Reply-To: <20210519190900.320044-4-hch@lst.de>
On Wed, May 19, 2021 at 09:08:52PM +0200, Christoph Hellwig wrote:
> ->b_offset can only be non-zero for SLAB backed buffers, so remove all
> code dealing with it for page backed buffers.
Can you refer to these as _XBF_KMEM buffers, not "SLAB backed"? That
way there is no confusion as to what type of buffer needs to pay
attention to b_offset...
> diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
> index 459ca34f26f588..21b4c58fd2fa87 100644
> --- a/fs/xfs/xfs_buf.h
> +++ b/fs/xfs/xfs_buf.h
> @@ -167,7 +167,8 @@ struct xfs_buf {
> atomic_t b_pin_count; /* pin count */
> atomic_t b_io_remaining; /* #outstanding I/O requests */
> unsigned int b_page_count; /* size of page array */
> - unsigned int b_offset; /* page offset in first page */
> + unsigned int b_offset; /* page offset in first page,
> + only used for SLAB buffers */
Here too.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2021-05-19 22:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 19:08 RFC: buffer cache backing page allocation cleanup Christoph Hellwig
2021-05-19 19:08 ` [PATCH 01/11] xfs: cleanup error handling in xfs_buf_get_map Christoph Hellwig
2021-05-20 23:43 ` Darrick J. Wong
2021-05-19 19:08 ` [PATCH 02/11] xfs: split xfs_buf_allocate_memory Christoph Hellwig
2021-05-19 22:36 ` Dave Chinner
2021-05-19 19:08 ` [PATCH 03/11] xfs: remove ->b_offset handling for page backed buffers Christoph Hellwig
2021-05-19 22:27 ` Dave Chinner [this message]
2021-05-19 19:08 ` [PATCH 04/11] xfs: cleanup _xfs_buf_get_pages Christoph Hellwig
2021-05-19 22:40 ` Dave Chinner
2021-05-20 5:23 ` Christoph Hellwig
2021-05-25 22:43 ` Dave Chinner
2021-05-19 19:08 ` [PATCH 05/11] xfs: remove the xb_page_found stat counter in xfs_buf_alloc_pages Christoph Hellwig
2021-05-19 22:55 ` Dave Chinner
2021-05-19 19:08 ` [PATCH 06/11] xfs: remove the size and nbytes variables " Christoph Hellwig
2021-05-19 22:56 ` Dave Chinner
2021-05-19 19:08 ` [PATCH 07/11] xfs: simplify the b_page_count calculation Christoph Hellwig
2021-05-19 19:08 ` [PATCH 08/11] xfs: centralize page allocation and freeing for buffers Christoph Hellwig
2021-05-19 23:22 ` Dave Chinner
2021-05-20 5:35 ` Christoph Hellwig
2021-05-25 23:59 ` Dave Chinner
2021-05-19 19:08 ` [PATCH 09/11] xfs: lift the buffer zeroing logic into xfs_buf_alloc_pages Christoph Hellwig
2021-05-19 19:08 ` [PATCH 10/11] xfs: retry allocations from xfs_buf_get_uncached as well Christoph Hellwig
2021-05-19 19:09 ` [PATCH 11/11] xfs: use alloc_pages_bulk_array() for buffers Christoph Hellwig
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