From: Dave Chinner <david@fromorbit.com>
To: Sergey Stepanov <g65434.2@gmail.com>
Cc: xfs@oss.sgi.com
Subject: Re: Question about AGFL
Date: Fri, 19 Oct 2012 08:13:11 +1100 [thread overview]
Message-ID: <20121018211311.GV2739@dastard> (raw)
In-Reply-To: <CAGNmme5p0k5zoNufs2040Aim3mkP_q4pP7z98WoRRkhdrf0JDw@mail.gmail.com>
On Thu, Oct 18, 2012 at 07:27:09PM +0400, Sergey Stepanov wrote:
> Hi.
>
> I have a device with XFS on it and if I run xfs_db on it, I get the
> following:
>
> xfs_db> agf 0
> xfs_db> p
> magicnum = 0x58414746
> versionnum = 1
> seqno = 0
> length = 6553344
> bnoroot = 19432
> cntroot = 20689
> bnolevel = 1
> cntlevel = 1
> flfirst = 0
> fllast = 3
> flcount = 4
> freeblks = 6529632
> longest = 6522442
> btreeblks = 0
> xfs_db> agfl 0
> xfs_db> p
> bno[0-127] = 0:1 1:2 2:3 3:4
>
> As you can see, AGFL contains block numbers 1-4.
>
> As far as I understand, blocks 1-3 contain roots for inode and free space
> trees, so it seems really suspicious to me that they are listed in free
> list.
Roots of the freespace btrees are at blocks:
> bnoroot = 19432
> cntroot = 20689
Root blocks move around, because the are reallocated during splits
change during merges.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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prev parent reply other threads:[~2012-10-18 21:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-18 15:27 Question about AGFL Sergey Stepanov
2012-10-18 21:13 ` Dave Chinner [this message]
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