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Re: [PATCH] xfs: fix extent format buffer allocation size

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH] xfs: fix extent format buffer allocation size
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 31 Mar 2011 16:51:14 +1100
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20110330093333.GA32582@xxxxxxxxxxxxx>
References: <1301453521-5614-1-git-send-email-david@xxxxxxxxxxxxx> <20110330093333.GA32582@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Wed, Mar 30, 2011 at 05:33:34AM -0400, Christoph Hellwig wrote:
> > +   xfs_bmbt_rec_t          *ext_buffer;
> > +
> > +   ext_buffer = kmem_alloc(XFS_IFORK_SIZE(ip, whichfork),
> If the fork size be the minimum of XFS_IFORK_SIZE and the if_bytes
> value?

I thought about that, but I don't think it makes any difference. If
there are no delalloc extents, then XFS_IFORK_SIZE and ifp->if_bytes
are identical when the fork is in extent format. If there are
delalloc extents, then XFS_IFORK_SIZE() is the one we want. Hence I
don't think we need to even consider the value of ifp->if_bytes at
all here....


Dave Chinner

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