From: Jan Kara Subject: Re: [PATCH 1/6] fs: add hole punching to fallocate Date: Fri, 19 Nov 2010 00:43:31 +0100 Message-ID: <20101118234331.GD5004@quack.suse.cz> References: <1290044780-2902-1-git-send-email-josef@redhat.com> <1290044780-2902-2-git-send-email-josef@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: david@fromorbit.com, linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com, cmm@us.ibm.com, cluster-devel@redhat.com, joel.becker@oracle.com, jack@suse.cz To: Josef Bacik Return-path: Content-Disposition: inline In-Reply-To: <1290044780-2902-2-git-send-email-josef@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Wed 17-11-10 20:46:15, Josef Bacik wrote: > Hole punching has already been implemented by XFS and OCFS2, and has the > potential to be implemented on both BTRFS and EXT4 so we need a generic way to > get to this feature. The simplest way in my mind is to add FALLOC_FL_PUNCH_HOLE > to fallocate() since it already looks like the normal fallocate() operation. > I've tested this patch with XFS and BTRFS to make sure XFS did what it's > supposed to do and that BTRFS failed like it was supposed to. Thank you, Looks nice now. Acked-by: Jan Kara Honza > > Signed-off-by: Josef Bacik > --- > fs/open.c | 7 ++++++- > include/linux/falloc.h | 1 + > 2 files changed, 7 insertions(+), 1 deletions(-) > > diff --git a/fs/open.c b/fs/open.c > index 4197b9e..5b6ef7e 100644 > --- a/fs/open.c > +++ b/fs/open.c > @@ -223,7 +223,12 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len) > return -EINVAL; > > /* Return error if mode is not supported */ > - if (mode && !(mode & FALLOC_FL_KEEP_SIZE)) > + if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) > + return -EOPNOTSUPP; > + > + /* Punch hole must have keep size set */ > + if ((mode & FALLOC_FL_PUNCH_HOLE) && > + !(mode & FALLOC_FL_KEEP_SIZE)) > return -EOPNOTSUPP; > > if (!(file->f_mode & FMODE_WRITE)) > diff --git a/include/linux/falloc.h b/include/linux/falloc.h > index 3c15510..73e0b62 100644 > --- a/include/linux/falloc.h > +++ b/include/linux/falloc.h > @@ -2,6 +2,7 @@ > #define _FALLOC_H_ > > #define FALLOC_FL_KEEP_SIZE 0x01 /* default is extend size */ > +#define FALLOC_FL_PUNCH_HOLE 0x02 /* de-allocates range */ > > #ifdef __KERNEL__ > > -- > 1.6.6.1 > -- Jan Kara SUSE Labs, CR