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Re: [PATCH 2/2] xfs: stop using kmalloc in xfs_buf_get_noaddr

To: Shailendra Tripathi <stripathi@xxxxxxxxx>
Subject: Re: [PATCH 2/2] xfs: stop using kmalloc in xfs_buf_get_noaddr
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 7 Mar 2007 13:38:24 +0100
Cc: Christoph Hellwig <hch@xxxxxx>, xfs@xxxxxxxxxxx, ecashin@xxxxxxxxxx, akpm@xxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <45EEACA0.4050206@xxxxxxxxx>
References: <20070307101324.GC30587@xxxxxx> <45EEACA0.4050206@xxxxxxxxx>
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On Wed, Mar 07, 2007 at 05:44:24PM +0530, Shailendra Tripathi wrote:
> Hi Christoph,
>            Did you do some testing for recovery when end of the physical 
>            log is seen ?

I ran xfsqa over it, which should catch this case.

>            When you will be dealing with striped ICLOG buffers or big 
>            sized ICLOGs, header size might range from 512 to 2k. Also, this 
> header 
> might be split into 2 parts at the end of physical log. Then, you don't 
> have page size buffer. Please verify that XFS_BUF_SETP_PTRs work correctly 
> for those cases.
>        Same thing is true when data section is split around physical log. 
>        You can get one part which is not PAGE sized.  

I should have made my wording more clear, we always do PAGE_SIZE +
buffer allocations.  After XFS_BUF_SETP_PTR the actually used buffer
might be smaller.  I tested XFS_BUF_SETP_PTR manually with
artifical test code aswell, and made sure it still works.
Long term I have a plan to replace XFS_BUF_SETP_PTR with better
schemes, but that's irrelevant for this patch.

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