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

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Message-ID: <x49mxxgr4t9.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 06 Apr 2010 11:14:42 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] raw: fsync method is now required

Anton Blanchard <anton@...ba.org> writes:

> 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. 
>
> 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.
>
> 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.

Databases like to use the raw interface.  Thanks for fixing this!

> Signed-off-by: Anton Blanchard <anton@...ba.org>

Reviewed-by: Jeff Moyer <jmoyer@...hat.com>
Tested-by: Jeff Moyer <jmoyer@...hat.com>
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