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Re: block allocations for the refcount btree

To: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Subject: Re: block allocations for the refcount btree
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 3 Mar 2016 06:05:56 -0800
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20160302212101.GF27973@xxxxxxxxxxxxxxxx>
References: <20160210190738.GA13051@xxxxxxxxxxxxx> <20160210214058.GN14668@dastard> <20160212191046.GA28421@xxxxxxxxxxxxx> <20160301181809.GC27973@xxxxxxxxxxxxxxxx> <20160301204013.GA23128@xxxxxxxxxxxxx> <20160302052411.GB1902@xxxxxxxxxxxxxxxx> <20160302095932.GA9141@xxxxxxxxxxxxx> <20160302164102.GA20109@xxxxxxxxxxxxxxxx> <20160302165704.GA31438@xxxxxxxxxxxxx> <20160302212101.GF27973@xxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.24 (2015-08-30)
On Wed, Mar 02, 2016 at 01:21:01PM -0800, Darrick J. Wong wrote:
> Ok.  I think the problem is that making changes to the refcount btree eats
> up our entire reservation in certain cases.  Can you try the following 
> bandaid?
> This should give us enough room to handle splitting the btree at both ends
> of a range that we're refcount-changing.

This seems to work in general.  I ran into one log related hang when
running -g auto on nfs, but it's not been reproducible so far.

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