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From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 22/23] xfs: add pre-write metadata buffer verifier callbacks
Date: Sat, 13 Oct 2012 12:02:12 -0400	[thread overview]
Message-ID: <20121013160212.GA24337@infradead.org> (raw)
In-Reply-To: <1350020669-19504-23-git-send-email-david@fromorbit.com>

> +xfs_agfl_write_verify(
> +	struct xfs_buf	*bp)
> +{
> +	xfs_agfl_verify(bp);
> +}
> +
> +void
> +xfs_agfl_read_verify(
> +	struct xfs_buf	*bp)
> +{
> +	xfs_agfl_verify(bp);
> +	bp->b_pre_io = xfs_agfl_write_verify;
>  	bp->b_iodone = NULL;
>  	xfs_buf_ioend(bp, 0);

I have to say I hate the way the API works for the buffer callbacks
even more now that I see the write side.  I know you're a bit annoyed
about churn from review requests, but I'd really prefer if this
was redone.

Two ways to do this nicer come to mind:

 - Have one commone b_verify callback, which gets a bool for_write
   argument to key of differences.  The xfs_buf_ioend call for reads
   remains in the caller, b_iodone is not touched at all.  This will
   remove the boilerplate code a lot in the current version.
 - Expecting to have some more difference between the read and the
   write side when we actually do the crcs from my work on the previous
   iteration of it it might make sense to have two callbacks, but I'd
   again prefer to not overload b_iodone.  Maybe just pass a:

struct xfs_buf_ops {
	int (*verify_read)(struct xfs_buf *);
	int (*verify_write)(struct xfs_buf *);
};

to all the buffer read/write API calls, and let that deal with it.

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  reply	other threads:[~2012-10-13 16:00 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-12  5:44 [PATCH 00/23] xfs: metadata verifiers V2 Dave Chinner
2012-10-12  5:44 ` [PATCH 01/23] xfs: growfs: don't read garbage for new secondary superblocks Dave Chinner
2012-10-12  5:44 ` [PATCH 02/23] xfs: invalidate allocbt blocks moved to the free list Dave Chinner
2012-10-12  5:44 ` [PATCH 03/23] xfs: make buffer read verication an IO completion function Dave Chinner
2012-10-12  5:44 ` [PATCH 04/23] xfs: uncached buffer reads need to return an error Dave Chinner
2012-10-12  5:44 ` [PATCH 05/23] xfs: verify superblocks as they are read from disk Dave Chinner
2012-10-12  5:44 ` [PATCH 06/23] xfs: verify AGF blocks " Dave Chinner
2012-10-12  5:44 ` [PATCH 07/23] xfs: verify AGI " Dave Chinner
2012-10-12  5:44 ` [PATCH 08/23] xfs: verify AGFL " Dave Chinner
2012-10-12  5:44 ` [PATCH 09/23] xfs: verify inode buffers " Dave Chinner
2012-10-12  5:44 ` [PATCH 10/23] xfs: verify btree blocks " Dave Chinner
2012-10-12  5:44 ` [PATCH 11/23] xfs: verify dquot " Dave Chinner
2012-10-12  5:44 ` [PATCH 12/23] xfs: add verifier callback to directorry read code Dave Chinner
2012-10-12  5:44 ` [PATCH 13/23] xfs: factor dir2 block read operations Dave Chinner
2012-10-12  5:44 ` [PATCH 14/23] xfs: verify dir2 block format buffers Dave Chinner
2012-10-12  5:44 ` [PATCH 15/23] xfs: factor dir2 free block reading Dave Chinner
2012-10-12  5:44 ` [PATCH 16/23] xfs: factor out dir2 data " Dave Chinner
2012-10-12  5:44 ` [PATCH 17/23] xfs: factor dir2 leaf read Dave Chinner
2012-10-12  5:44 ` [PATCH 18/23] xfs: factor and verify attr leaf reads Dave Chinner
2012-10-12  5:44 ` [PATCH 19/23] xfs: add xfs_da_node verification Dave Chinner
2012-10-12  5:44 ` [PATCH 20/23] xfs: Add verifiers to dir2 data readahead Dave Chinner
2012-10-12  5:44 ` [PATCH 21/23] xfs: add buffer pre-write callback Dave Chinner
2012-10-12  5:44 ` [PATCH 22/23] xfs: add pre-write metadata buffer verifier callbacks Dave Chinner
2012-10-13 16:02   ` Christoph Hellwig [this message]
2012-10-14  0:12     ` Dave Chinner
2012-10-18  4:50       ` [PATCH 24/23] xfs: convert buffer verifiers to an ops structure Dave Chinner
2012-10-23 12:36         ` Christoph Hellwig
2012-10-23 21:42           ` Dave Chinner
2012-10-12  5:44 ` [PATCH 23/23] xfs: connect up write verifiers to new buffers Dave Chinner

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