linux-ext4 - Re: [PATCH] ext4: Do not reserve clusters when fs doesn't support extents

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Date:	Sun, 8 Dec 2013 21:13:59 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Lukas Czerner <lczerner@...hat.com>
Subject: Re: [PATCH] ext4: Do not reserve clusters when fs doesn't support
 extents

On Thu, Nov 28, 2013 at 12:42:45PM +0100, Jan Kara wrote:
> When filesystem doesn't support extents (like in ext2/3 compatibility
> modes), there is no need to reserve any clusters. Space estimates for
> writing are exact, hole punching doesn't need new metadata, and there
> are no unwritten extents to convert.
> 
> This fixes a problem when filesystem still having some free space when
> accessed with a native ext2/3 driver suddently reports ENOSPC when
> accessed with ext4 driver.
> 
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> CC: Lukas Czerner <lczerner@...hat.com>
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, applied.  Given that distro's are using
CONFIG_EXT4_USE_FOR_EXT23, I'm going to queue this for the stable kernel.

			       	     	- Ted
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