All of lore.kernel.org
 help / color / mirror / Atom feed
From: Miao Xie <miaox@cn.fujitsu.com>
To: Chris Mason <chris.mason@oracle.com>, Josef Bacik <josef@redhat.com>
Cc: Linux Btrfs <linux-btrfs@vger.kernel.org>
Subject: About btrfs chunk tree backups
Date: Thu, 03 Mar 2011 17:01:00 +0800	[thread overview]
Message-ID: <4D6F58CC.9030003@cn.fujitsu.com> (raw)

Hi, Chris and Josef

Recently, I am interested in chunk tree backups, which is described in
Project ideas web. But I found it is hard to be implemented.

The description said "make the mappings discoverable via a block device
scan so that we can recover from corrupted chunk trees", I think it is
hard to find the boundary of each stripe, which is the constituent of
the chunks, via a block device scan according to the current on-disk data
structures. And besides that, even though we find the stripes of each
chunks, we still don't know the order of the stripes in one chunk. So
I think chunk tree backups is hard to be implemented.

Maybe I made some mistakes in understanding this project idea?

Thanks
Miao


             reply	other threads:[~2011-03-03  9:01 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-03  9:01 Miao Xie [this message]
2011-03-03 12:37 ` About btrfs chunk tree backups Josef Bacik
2011-03-08  4:14   ` Miao Xie
2011-03-08 15:09     ` Josef Bacik

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=4D6F58CC.9030003@cn.fujitsu.com \
    --to=miaox@cn.fujitsu.com \
    --cc=chris.mason@oracle.com \
    --cc=josef@redhat.com \
    --cc=linux-btrfs@vger.kernel.org \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.