From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: Re: [PATCH 2/4] vfs: Protect write paths by sb_start_write - sb_end_write Date: Thu, 12 Jan 2012 21:11:21 +0100 Message-ID: <20120112201121.GD8778@quack.suse.cz> References: <1326331253-6497-1-git-send-email-jack@suse.cz> <1326331253-6497-3-git-send-email-jack@suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jan Kara , linux-fsdevel@vger.kernel.org, LKML , linux-ext4@vger.kernel.org, xfs@oss.sgi.com, Eric Sandeen , Dave Chinner , Surbhi Palande , Kamal Mostafa , Christoph Hellwig To: Andreas Dilger Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org 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 > > --- > > 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 SUSE Labs, CR