linux-kernel - Re: [PATCH 1/8] writeback: move super_block argument to struct writeback

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Message-ID: <20090901215130.GA24397@infradead.org>
Date:	Tue, 1 Sep 2009 17:51:30 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, david@...morbit.com, hch@...radead.org,
	tytso@....edu, akpm@...ux-foundation.org, jack@...e.cz
Subject: Re: [PATCH 1/8] writeback: move super_block argument to struct
	writeback_control

On Tue, Sep 01, 2009 at 01:18:59PM +0200, Jens Axboe wrote:
> Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
> ---
>  drivers/staging/pohmelfs/inode.c |    3 ++-
>  fs/fs-writeback.c                |   14 +++++++-------
>  fs/ubifs/budget.c                |    5 +++--
>  fs/ubifs/super.c                 |    3 ++-
>  include/linux/fs.h               |    3 +--
>  include/linux/writeback.h        |    2 ++

I think we need better calling conventions here.  Currently this whole
area is on crack, we have from highest to lowest layer:


 - sync_inodes_sb - does two totally different things based on the
   wait flag.  If the wait flag is set does a WB_SYNC_ALL writeout
   of all pages.  If not does a WB_SYNC_NONE based on some whacky
   heuristics despite actually wanting to write out everything.
 - sync_sb_inodes - toally useless wrapper.  Introduces because reiser4
   eventually wanted to hook in there, but that needs some major
   rethinking before it can happen.
 - generic_sync_inodes_sb - used to implement both cases of
   sync_inodes_sb, plus:

    - UBIFS budgeting writeouts, in either blocking or non-blocking
      way
    - UBIFS sync use that is gone in -next because we fixed sync
    - a complete crackpot usage in pohmelfs, which we fortunately can
      simply ignore because it's in -staging.


So instead of exporting generic_sync_sb_inodes which now takes just
a wbc we should just export two helpers to either data integrity sync
and SB or do a SYNC_NONE on it, both taking no other parameter than
the superblock.

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