From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaegeuk Kim Subject: Re: [PATCH 3/3] f2fs: support clone_file_range Date: Mon, 18 Jul 2016 21:48:20 -0700 Message-ID: <20160719044820.GA80986@jaegeuk> References: <20160717062427.56718-1-jaegeuk@kernel.org> <20160717062427.56718-3-jaegeuk@kernel.org> <20160719034736.GA4037@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20160719034736.GA4037@infradead.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: Christoph Hellwig Cc: linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net List-Id: linux-api@vger.kernel.org On Mon, Jul 18, 2016 at 08:47:36PM -0700, Christoph Hellwig wrote: > On Sat, Jul 16, 2016 at 11:24:27PM -0700, Jaegeuk Kim wrote: > > This patch implements clone_file_range in f2fs. > > [...] > > > +int f2fs_clone_file_range(struct file *file_in, loff_t pos_in, > > + struct file *file_out, loff_t pos_out, u64 len) > > +{ > > + return f2fs_clone_files(file_in, pos_in, file_out, pos_out, len); > > +} > > + > > Falling back from copy to clone should be done in the VFS. I look into > implementing the fallback, and the code is trivial, but we don't seem > to have any useful coverage for copy_file_range yet, so I didn't dare > to add it yet. How did you test copy and clone in f2fs? And how did > you handle the difference in corner cases (e.g. the lacking 0 special > case in copy)? Frankly speaking, I confused the behaviors without being aware of corner cases. And thus, I dropped the patches already. Instead, I realized that what I did was moving a range of blocks from one file to another file. So, I've been testing a new ioctl, F2FS_IOC_MOVE_RANGE. In terms of coverage, I just did some unit tests only. Thanks, ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports.http://sdm.link/zohodev2dev