Linux-BTRFS Archive on lore.kernel.org
 help / color / Atom feed
From: Goffredo Baroncelli <kreijack@libero.it>
To: linux-btrfs@vger.kernel.org
Subject: Re: [patch 0/2] Control filesystem balances (kernel side)
Date: Sat, 30 Oct 2010 19:44:35 +0200
Message-ID: <201010301944.35962.kreijack@libero.it> (raw)
In-Reply-To: <20101030000726.286517546@carfax.org.uk>

On Saturday, 30 October, 2010, Hugo Mills wrote:
>    These two patches give a degree of control over balance operations.
> The first makes it possible to get an idea of how much work remains to
> do, by tracking the number of block groups (chunks) that need to be
> moved/rewritten. The second patch allows a running balance operation
> to be cancelled when the current block group has been moved.
> 
>    One fundamental question, though -- is the progress monitor
> function best implemented as an ioctl, as I've done here, or should it
> be two or three sysfs files? I'm thinking of /proc/mdstat...
> Obviously, /proc/mdstat would never get into /sys, but exposing the
> "expected" and "remaining" values as files has an attractive
> simplicity to it.


I like the idea that these info should be put under sysfs. Something like

/sys/btrfs/<filesystem-uuid>/
                             balance	-> info on balancing
                             devices	-> list of device (a directory of
                                           links or a file which contains 
                                           the list of devices)
                             subvolumes/ -> info on subvolume(s)
                             label       -> label of the filesystem
                             <other btrfs filesystem related knoba>

                                           


Obviously we need another btrfs command to extract an uuid from a btrfs 
filesystem like:

# btrfs filesystem get-uuid /path/to/a/btrfs/filesystem
f9b9c413-0dc8-4e3f-94f2-86faa702f519

> 
>    The user-space side of things are in a separate patch series, to
> follow.
> 
>    Please be gentle with me, this is my first (serious, non-trivial)
> kernel patch. :)
> 
>    Hugo.
> 
> 
> -- 
> === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
>   PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
>    --- "No!  My collection of rare, incurable diseases! Violated!" ---   
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 


-- 
gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo) <kreijack@inwind.it>
Key fingerprint = 4769 7E51 5293 D36C 814E  C054 BF04 F161 3DC5 0512

  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-30  0:07 Hugo Mills
2010-10-30  0:07 ` [patch 1/2] Balance progress monitoring Hugo Mills
2010-10-30 13:37   ` Hugo Mills
2010-10-30 13:39   ` [patch 1/2] Balance progress monitoring (updated) Hugo Mills
2010-11-01  8:06     ` liubo
2010-11-01 12:55       ` Hugo Mills
2010-11-02  0:51         ` liubo
2010-10-30  0:07 ` [patch 2/2] Cancel filesystem balance Hugo Mills
2010-10-30 17:44 ` Goffredo Baroncelli [this message]
2010-11-01 12:58   ` [patch 0/2] Control filesystem balances (kernel side) Xavier Nicollet
2010-11-01 12:52     ` Tomasz Torcz
2010-11-01 13:05   ` Hugo Mills
2010-11-04 22:55   ` RFC: exporting info via sysfs [was Re: [patch 0/2] Control filesystem balances (kernel side)] Goffredo Baroncelli
2010-11-05 12:41     ` Hugo Mills
2010-11-08 18:01 [patch 0/2] Control filesystem balances (kernel side) Mike Fedyk

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=201010301944.35962.kreijack@libero.it \
    --to=kreijack@libero.it \
    --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

Linux-BTRFS Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-btrfs/0 linux-btrfs/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-btrfs linux-btrfs/ https://lore.kernel.org/linux-btrfs \
		linux-btrfs@vger.kernel.org
	public-inbox-index linux-btrfs

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-btrfs


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git