From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id B28957F69 for ; Tue, 6 Jan 2015 23:46:45 -0600 (CST) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay1.corp.sgi.com (Postfix) with ESMTP id 922708F8039 for ; Tue, 6 Jan 2015 21:46:45 -0800 (PST) Received: from mailout4.samsung.com (mailout4.samsung.com [203.254.224.34]) by cuda.sgi.com with ESMTP id EVIbSwpajSwK7fk9 (version=TLSv1 cipher=RC4-MD5 bits=128 verify=NO) for ; Tue, 06 Jan 2015 21:46:44 -0800 (PST) Received: from epcpsbgr1.samsung.com (u141.gpu120.samsung.co.kr [203.254.230.141]) by mailout4.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NHS004N7LDUD0A0@mailout4.samsung.com> for xfs@oss.sgi.com; Wed, 07 Jan 2015 14:46:42 +0900 (KST) From: Namjae Jeon References: <003f01d02670$27a5e300$76f1a900$@samsung.com> <20150106163220.GE5874@bfoster.bfoster> In-reply-to: <20150106163220.GE5874@bfoster.bfoster> Subject: RE: [PATCH v7 1/11] fs: Add support FALLOC_FL_INSERT_RANGE for fallocate Date: Wed, 07 Jan 2015 14:46:41 +0900 Message-id: <001701d02a3d$502c5a40$f0850ec0$@samsung.com> MIME-version: 1.0 Content-language: ko List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: 'Brian Foster' Cc: 'Theodore Ts'o' , linux-kernel@vger.kernel.org, xfs@oss.sgi.com, 'Ashish Sangwan' , linux-fsdevel@vger.kernel.org, 'linux-ext4' > On Fri, Jan 02, 2015 at 06:40:33PM +0900, Namjae Jeon wrote: > > FALLOC_FL_INSERT_RANGE command is the opposite command of > > FALLOC_FL_COLLAPSE_RANGE that is needed for advertisers or someone who want to > > add some data in the middle of file. FALLOC_FL_INSERT_RANGE will create space > > for writing new data within a file after shifting extents to right as given > > length. and this command also has same limitation as FALLOC_FL_COLLAPSE_RANGE, > > that is block boundary and use ftruncate(2) for crosses EOF. > > > > Signed-off-by: Namjae Jeon > > Signed-off-by: Ashish Sangwan > > --- > > fs/open.c | 8 +++++++- > > include/uapi/linux/falloc.h | 15 +++++++++++++++ > > 2 files changed, 22 insertions(+), 1 deletion(-) > > > > diff --git a/fs/open.c b/fs/open.c > > index 36662d0..74ed498 100644 > > --- a/fs/open.c > > +++ b/fs/open.c > > @@ -232,7 +232,8 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len) > > > > /* Return error if mode is not supported */ > > if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | > > - FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE)) > > + FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | > > + FALLOC_FL_INSERT_RANGE)) > > return -EOPNOTSUPP; > > > > /* Punch hole and zero range are mutually exclusive */ > > @@ -250,6 +251,11 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len) > > (mode & ~FALLOC_FL_COLLAPSE_RANGE)) > > return -EINVAL; > > > > + /* Insert range should only be used exclusively. */ > > + if ((mode & FALLOC_FL_INSERT_RANGE) && > > + (mode & ~FALLOC_FL_INSERT_RANGE)) > > + return -EINVAL; > > + > > if (!(file->f_mode & FMODE_WRITE)) > > return -EBADF; > > > > diff --git a/include/uapi/linux/falloc.h b/include/uapi/linux/falloc.h > > index d1197ae..1f20723 100644 > > --- a/include/uapi/linux/falloc.h > > +++ b/include/uapi/linux/falloc.h > > @@ -41,4 +41,19 @@ > > */ > > #define FALLOC_FL_ZERO_RANGE 0x10 > > > > +/* > > + * FALLOC_FL_INSERT_RANGE is use to insert space within the file size without > > used > > > + * overwriting any existing data. The contents of the file beyond offset are > > + * shifted towards right by len bytes to create a hole. As such, this > > + * operation will increase the size of the file by len bytes. > > I suppose we should split this comment up into a few paragraphs similar > to the collapse range comment it is based on. That means we split > here... > > > + * Different filesystems may implement different limitations on the granularity > > + * of the operation. Most will limit operations to filesystem block size > > + * boundaries, but this boundary may be larger or smaller depending on > > + * the filesystem and/or the configuration of the filesystem or file. > > ... and here. > > Otherwise this looks fine to me. Okay, I will fix them. > > Brian > > > + * Attempting to insert space using this flag at OR beyond the end of > > + * the file is considered an illegal operation - just use ftruncate(2) or > > + * fallocate(2) with mode 0 for such type of operations. > > + */ > > +#define FALLOC_FL_INSERT_RANGE 0x20 > > + > > #endif /* _UAPI_FALLOC_H_ */ > > -- > > 1.7.11-rc0 > > _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs