linux-ext4 - Re: [PATCH 2/4] vfs: Protect write paths by sb_start_write

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Date:	Thu, 12 Jan 2012 21:11:21 +0100
From:	Jan Kara <jack@...e.cz>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, Eric Sandeen <sandeen@...deen.net>,
	Dave Chinner <dchinner@...hat.com>,
	Surbhi Palande <csurbhi@...il.com>,
	Kamal Mostafa <kamal@...onical.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 2/4] vfs: Protect write paths by sb_start_write -
 sb_end_write

On Thu 12-01-12 12:56:01, Andreas Dilger wrote:
> On 2012-01-11, at 6:20 PM, Jan Kara wrote:
> > There are three entry points which dirty pages in a filesystem.  mmap (handled
> > by block_page_mkwrite()), buffered write (handled by
> > __generic_file_aio_write()), and truncate (it can dirty last partial page -
> > handled by do_truncate()). Protect these places with sb_start_write() and
> > sb_end_write().
> > 
> > Signed-off-by: Jan Kara <jack@...e.cz>
> > ---
> > fs/buffer.c  |   18 ++----------------
> > fs/open.c    |    6 ++++++
> > mm/filemap.c |    3 ++-
> > 3 files changed, 10 insertions(+), 17 deletions(-)
> > 
> > diff --git a/fs/buffer.c b/fs/buffer.c
> > index 19d8eb7..8519405 100644
> > --- a/fs/buffer.c
> > +++ b/fs/buffer.c
> > @@ -2371,18 +2371,7 @@ int __block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
> 
> The comment for __block_page_mkwrite() needs to be updated to reference
> sb_start_write() and sb_end_write() instead of vfs_check_frozen().
  Thanks. Fixed.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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