linux-kernel - Re: [PATCH v5 3/10] ext4: Add support FALLOC_FL_COLLAPSE

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Message-ID: <20140219215805.GA1714@gmail.com>
Date:	Wed, 19 Feb 2014 22:58:05 +0100
From:	Dongsu Park <dongsu.park@...fitbricks.com>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	viro@...iv.linux.org.uk, david@...morbit.com, bpm@....com,
	tytso@....edu, 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 3/10] ext4: Add support FALLOC_FL_COLLAPSE_RANGE for
 fallocate

Hi Namjae,
see below:

On 19.02.2014 01:38, Namjae Jeon wrote:
> This patch implements fallocate's FALLOC_FL_COLLAPSE_RANGE for Ext4.
...<snip>...
> +	/*
> +	 * Don't start shifting extents until we make sure the hole is big
> +	 * enough to accomodate the shift.
> +	 */
> +	path = ext4_ext_find_extent(inode, start - 1, NULL, 0);
> +	depth = path->p_depth;
> +	extent =  path[depth].p_ext;
> +	ex_start = extent->ee_block;
> +	ex_end = extent->ee_block + ext4_ext_get_actual_len(extent);
> +	ext4_ext_drop_refs(path);
> +	kfree(path);
> +
> +	if ((start == ex_start && shift > ex_start) ||
> +	    (shift > start - ex_end)) {

This line causes a compile error. So the fix would be like that:

-	    (shift > start - ex_end)) {
+	    (shift > start - ex_end))

> +		return -EINVAL;
> +
> +	/* Its safe to start updating extents */
...<snip>...

Apart from that, the whole patchset seems to work without error,
both on xfs and on ext4.
Of course I had to remove Lukas' patches before testing collapse-range.
So it would be excellent if two patch series could get somehow merged.

Tested-by: Dongsu Park <dongsu.park@...fitbricks.com>

Regards,
Dongsu
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