linux-ext4 - Re: [PATCH v5 1/10] fs: Add new flag(FALLOC_FL_COLLAPSE

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Message-ID: <20140222140625.GD26637@thunk.org>
Date:	Sat, 22 Feb 2014 09:06:25 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	viro@...iv.linux.org.uk, david@...morbit.com, bpm@....com,
	adilger.kernel@...ger.ca, jack@...e.cz, mtk.manpages@...il.com,
	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>,
	Ashish Sangwan <a.sangwan@...sung.com>
Subject: Re: [PATCH v5 1/10] fs: Add new flag(FALLOC_FL_COLLAPSE_RANGE) for
 fallocate

On Wed, Feb 19, 2014 at 01:37:43AM +0900, Namjae Jeon wrote:
> +	/*
> +	 * There is no need to overlap collapse range with EOF, in which case
> +	 * it is effectively a truncate operation
> +	 */
> +	if ((mode & FALLOC_FL_COLLAPSE_RANGE) &&
> +	    (offset + len >= i_size_read(inode)))
> +		return -EINVAL;
> +

I wonder if we should just translate a collapse range that is
equivalent to a truncate operation to, in fact, be a truncate
operation?

						- Ted
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