linux-kernel - Re: [PATCH] raw: fsync method is now required

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Message-Id: <20100405133902.082a6ef7.akpm@linux-foundation.org>
Date:	Mon, 5 Apr 2010 13:39:02 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Anton Blanchard <anton@...ba.org>
Cc:	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] raw: fsync method is now required

On Sun, 4 Apr 2010 10:45:23 +1000
Anton Blanchard <anton@...ba.org> wrote:

> 
> Commit 148f948ba877f4d3cdef036b1ff6d9f68986706a (vfs: Introduce new helpers for syncing after writing to O_SYNC file or IS_SYNC inode) broke the raw driver.
> 
> We now call through generic_file_aio_write -> generic_write_sync ->
> vfs_fsync_range. vfs_fsync_range has:
> 
>         if (!fop || !fop->fsync) {
>                 ret = -EINVAL;
>                 goto out;
>         }
> 
> But drivers/char/raw.c doesn't set an fsync method. 

So if you run fsync() against a /dev/rawX fd you get -EINVAL?  erk.

> We have two options: fix it or remove the raw driver completely. I'm happy
> to do either, the fact this has been broken for so long suggests it is
> rarely used.

Well.  It shows that fsync() is rarely used.

> The patch below adds an fsync method to the raw driver. My knowledge of the
> block layer is pretty sketchy so this could do with a once over.
> 
> If we instead decide to remove the raw driver, this patch might still be
> useful as a backport to 2.6.33 and 2.6.32.

People go all whiny when I talk about removing raw.c.  I gave up.
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