From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH v3] fs: Invalidate the cache for a parent block-device if fsync() is called for a partition Date: Tue, 31 Jan 2012 14:37:48 -0500 Message-ID: <20120131193748.GA10093@infradead.org> References: <4F213E1A.4060808@redhat.com> <1327584802-14298-1-git-send-email-ndevos@redhat.com> <20120126134051.6add3cd2.akpm@linux-foundation.org> <20120126214534.GA9319@infradead.org> <4F28102C.1070207@redhat.com> <20120131105824.c48351b6.akpm@linux-foundation.org> <20120131190425.GA10533@infradead.org> <20120131113250.816ee772.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Christoph Hellwig , Niels de Vos , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Al Viro , Mikulas Patocka , Jeff Moyer , "Bryn M. Reeves" To: Andrew Morton Return-path: Content-Disposition: inline In-Reply-To: <20120131113250.816ee772.akpm@linux-foundation.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org On Tue, Jan 31, 2012 at 11:32:50AM -0800, Andrew Morton wrote: > I didn't say the kernel would support this as-is. > > If the partitioning scheme requires writing to the individual > partitions then something would need to be done, such as a simple > offsetting DM driver. Writing partition tables requires writing to them main block device. Seriously - if people want to support block devices nodes > 16TB dealing with this isn't the problem. They'll need to find a way to do buffered I/O without using the pagecache to get it right, at which point blkdev_get_block in either form will simply go away.