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

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Message-ID: <20140331145625.GA10791@infradead.org>
Date:	Mon, 31 Mar 2014 07:56:25 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	viro@...iv.linux.org.uk, david@...morbit.com, hch@...radead.org,
	tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
	lczerner@...hat.com, linux-fsdevel@...r.kernel.org,
	xfs@....sgi.com, linux-ext4@...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

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?

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