linux-kernel - Re: [PATCH 0/3] fs: Introduce FALLOC_FL_INSERT

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Date:	Tue, 1 Apr 2014 09:19:12 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Dave Chinner <david@...morbit.com>,
	"Theodore Ts'o" <tytso@....edu>,
	"adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
	Jan Kara <jack@...e.cz>,
	Lukáš Czerner <lczerner@...hat.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>, xfs@....sgi.com,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Namjae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH 0/3] fs: Introduce FALLOC_FL_INSERT_RANGE for fallocate

2014-03-31 23:56 GMT+09:00 Christoph Hellwig <hch@...radead.org>:
> On Mon, Mar 31, 2014 at 11:53:31PM +0900, Namjae Jeon wrote:
>> This flag will work opposite to the newly added FALLOC_FL_COLLAPSE_RANGE flag.
>> As such, specifying FALLOC_FL_INSERT_RANGE flag will insert zeroed-out space
>> in between the file within the range specified by offset and len. User can
>> write new data in this space. e.g. ads.
>> Like collapse range, currently we have the limitation that offset and len
>> should be block size aligned for both XFS and Ext4.
>
> Btw, I remember Samsung also had an ioctl for XFS to split a file into
> two without moving the data, do you plan to submit that one as well?
>
Hi Christoph.
Sure, I'm planning to introduce FS_IOC_MOVE_DATA ioctl that can split
file as well as merging for xfs and ext4.
I already started to implement it. and will post it soon.

Thanks.
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