From: Paul Clements <Paul.Clements@SteelEye.com>
To: ptb@it.uc3m.es
Cc: Neil Brown <neilb@cse.unsw.edu.au>, linux-raid@vger.kernel.org
Subject: Re: raid1 bitmap code [Was: Re: Questions answered by Neil Brown]
Date: Fri, 28 Feb 2003 11:14:37 -0500 [thread overview]
Message-ID: <3E5F8AED.82D3B484@SteelEye.com> (raw)
In-Reply-To: 200302281525.h1SFPbs32224@oboe.it.uc3m.es
"Peter T. Breuer" wrote:
>
> "Paul Clements wrote:"
> > That's OK, we don't need to know. We really just want to know if there
> > are any outstanding writes for that chunk. We increment the chunk
> > counter for every write and decrement it when the write finishes. Now,
>
> I agree. I modified the bitmap so that when a page can't be got to make
> a mark on, then we count pending "writes" by summing one to a count
> for every attempted write to the zone covered by the missing page
> and subtracting one for every attempted clear.
That sounds good. I'll have to merge up to 2.6...ugh...now I really need
to put this all in CVS...I'm making some progress with the mmap stuff
and I've got the code done for duplicating the buffers for the async
writes to the backup devices.
I'll need a pool of memory for that too, since I can't just fail in the
middle of I/O...
--
Paul
next prev parent reply other threads:[~2003-02-28 16:14 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-24 20:15 Questions answered by Neil Brown Peter T. Breuer
2003-02-24 21:58 ` Paul Clements
2003-02-25 3:10 ` Neil Brown
2003-02-25 9:11 ` Peter T. Breuer
2003-02-26 7:44 ` Paul Clements
2003-02-26 8:09 ` Peter T. Breuer
2003-02-26 16:41 ` Paul Clements
2003-02-26 17:26 ` Peter T. Breuer
2003-02-26 18:29 ` raid1 bitmap code [Was: Re: Questions answered by Neil Brown] Paul Clements
2003-02-26 19:15 ` Peter T. Breuer
2003-02-26 22:12 ` Neil Brown
2003-02-26 23:24 ` Peter T. Breuer
2003-02-27 7:26 ` Paul Clements
2003-02-27 8:48 ` Peter T. Breuer
2003-02-27 15:47 ` Paul Clements
2003-02-27 5:33 ` Paul Clements
2003-02-27 10:35 ` Peter T. Breuer
2003-02-27 10:50 ` Peter T. Breuer
2003-02-27 16:51 ` Paul Clements
2003-02-27 17:18 ` Peter T. Breuer
2003-02-28 15:25 ` Peter T. Breuer
2003-02-28 16:14 ` Paul Clements [this message]
2003-02-28 16:23 ` Peter T. Breuer
2003-02-26 21:45 ` Questions answered by Neil Brown Neil Brown
2003-02-26 21:41 ` Neil Brown
-- strict thread matches above, loose matches on Subject: below --
2003-03-01 12:36 raid1 bitmap code [Was: Re: Questions answered by Neil Brown] Peter T. Breuer
2003-03-13 18:49 Peter T. Breuer
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=3E5F8AED.82D3B484@SteelEye.com \
--to=paul.clements@steeleye.com \
--cc=linux-raid@vger.kernel.org \
--cc=neilb@cse.unsw.edu.au \
--cc=ptb@it.uc3m.es \
/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).