From: Andrew Morton <akpm@osdl.org>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/4] change buffer_head.b_size to size_t
Date: Wed, 1 Mar 2006 17:51:48 -0800 [thread overview]
Message-ID: <20060301175148.2250b36e.akpm@osdl.org> (raw)
In-Reply-To: <1141075361.10542.21.camel@dyn9047017100.beaverton.ibm.com>
Badari Pulavarty <pbadari@us.ibm.com> wrote:
>
> + * Historically, a buffer_head was used to map a single block
> + * within a page, and of course as the unit of I/O through the
> + * filesystem and block layers. Nowadays the basic I/O unit
> + * is the bio, and buffer_heads are used for extracting block
> + * mappings (via a get_block_t call), for tracking state within
> + * a page (via a page_mapping) and for wrapping bio submission
> + * for backward compatibility reasons (e.g. submit_bh).
Well kinda. A buffer_head remains the kernel's basic abstraction for a
"disk block". We cannot replace that with `struct page' (size isn't
flexible) nor of course with `struct bio'.
next prev parent reply other threads:[~2006-03-02 1:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-27 21:20 [PATCH 0/4] map multiple blocks in get_block() and mpage_readpages() Badari Pulavarty
2006-02-27 21:22 ` [PATCH 1/4] change buffer_head.b_size to size_t Badari Pulavarty
2006-03-02 1:51 ` Andrew Morton
2006-03-02 1:51 ` Andrew Morton [this message]
2006-03-02 2:22 ` Nathan Scott
2006-03-02 2:56 ` Andrew Morton
2006-03-06 19:54 ` Tim Pepper
2006-02-27 21:23 ` [PATCH 2/4] pass b_size to ->get_block() Badari Pulavarty
2006-03-02 1:52 ` Andrew Morton
2006-03-03 17:17 ` Badari Pulavarty
2006-02-27 21:24 ` [PATCH 3/4] map multiple blocks for mpage_readpages() Badari Pulavarty
2006-03-02 4:45 ` Andrew Morton
2006-03-03 16:51 ` Badari Pulavarty
2006-02-27 21:24 ` [PATCH 4/4] remove ->get_blocks() support Badari Pulavarty
2006-03-02 1:52 ` [PATCH 0/4] map multiple blocks in get_block() and mpage_readpages() Andrew Morton
2006-03-03 17:05 ` Badari Pulavarty
2006-03-03 20:32 ` Andrew Morton
2006-03-03 21:54 ` Badari Pulavarty
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