From: Fawad Lateef <fawadlateef@gmail.com>
To: Coywolf Qi Hunt <qiyong@fc-cn.com>
Cc: Joshua Hudson <joshudson@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: Block device API
Date: Wed, 25 Jan 2006 14:27:22 +0500 [thread overview]
Message-ID: <1e62d1370601250127r50eaf50dg5ad705877dbf771c@mail.gmail.com> (raw)
In-Reply-To: <20060125083728.GA16593@localhost.localdomain>
On 1/25/06, Coywolf Qi Hunt <qiyong@fc-cn.com> wrote:
> On Wed, Jan 25, 2006 at 08:17:02AM +0500, Fawad Lateef wrote:
> >
> > AFAIK there isn't any documentation/article for block and filesystem
> > layer interaction (or till now me also not able to find any) :)
> >
> >
> > sb_bread is the function used for reading a block (especially
> > superblock) from the storage. For reading/writing do look at
>
> Does __bread() contribute to page cache? I think not. And we don't
> care the work done by __bread().
>
Ya, __bread() directly sends read request to the block device without
involvement of buffer cache ! Is there any point In my explaination in
which I mentioned __bread related to buffer_cache ? if yes then its a
mistake .... and __bread is direct function which calls submit_bh and
waits for its completion.
--
Fawad Lateef
prev parent reply other threads:[~2006-01-25 9:27 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-25 2:58 Joshua Hudson
2006-01-25 3:17 ` Fawad Lateef
2006-01-25 8:37 ` Coywolf Qi Hunt
2006-01-25 9:27 ` Fawad Lateef [this message]
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