From: Francis Moreau <francis.moro@gmail.com>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Andreas Dilger <adilger@sun.com>, linux-fsdevel@vger.kernel.org
Subject: Re: PG_updatodate vs BH_updatodate
Date: Sun, 23 Nov 2008 21:14:47 +0100 [thread overview]
Message-ID: <m28wra5he0.fsf@gmail.com> (raw)
In-Reply-To: <20081123122124.GH5707@parisc-linux.org> (Matthew Wilcox's message of "Sun\, 23 Nov 2008 05\:21\:24 -0700")
Matthew Wilcox <matthew@wil.cx> writes:
> On Sun, Nov 23, 2008 at 01:14:52PM +0100, Francis Moreau wrote:
>
>> Are there any cases where a page can be partially uptodate ?
>
> Consider a filesystem with 1k blocks and a system with a page size of 4k.
> You have a buffer_head for each of the four blocks that are being kept
> in the page, and you want to track their dirty state independently.
Sorry but I'm confused since you're taking about the dirty state
(tracked by BH_Dirty bit) and I was taking about the uptodate state
(tracked by BH_Uptodate bit).
>
> For file data, no this doesn't happen. But for metadata, it happens
>quite easily.
Could you give me an example of these metadata ?
Thanks
Francis
next prev parent reply other threads:[~2008-11-23 20:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-21 22:03 PG_updatodate vs BH_updatodate Francis Moreau
2008-11-23 4:19 ` Andreas Dilger
2008-11-23 12:14 ` Francis Moreau
2008-11-23 12:21 ` Matthew Wilcox
2008-11-23 20:14 ` Francis Moreau [this message]
2008-11-24 15:56 ` Jörn Engel
2008-11-24 16:42 ` Francis Moreau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=m28wra5he0.fsf@gmail.com \
--to=francis.moro@gmail.com \
--cc=adilger@sun.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=matthew@wil.cx \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).