linux-ext4 - RE: [PATCH v2 2/2] ext4: disable COLLAPSE

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Message-id: <001e01cf5def$72489500$56d9bf00$@samsung.com>
Date:	Tue, 22 Apr 2014 14:55:21 +0900
From:	Namjae Jeon <namjae.jeon@...sung.com>
To:	'Theodore Ts'o' <tytso@....edu>
Cc:	'linux-ext4' <linux-ext4@...r.kernel.org>,
	'Lukáš Czerner' <lczerner@...hat.com>
Subject: RE: [PATCH v2 2/2] ext4: disable COLLAPSE_RANGE for bigalloc

> On Mon, Apr 21, 2014 at 01:52:28PM +0900, Namjae Jeon wrote:
> > >
> > > What's the status of the "[2/3] ext4: fix ZERO_RANGE test failure in
> > > data journalling mode" patch.  Is it no longer needed?
> > It is needed. Currently, I am considering your suggestion of introducing
> > EXT4_I(inode)->i_write_mutex which can also include ext4_aio_mutex.
> 
> OK; I've already pushed a set of patches to Linus because it's getting
> fairly late in the development cycle, and we really want to get as
> much of the bug fixes into -rc3 (having missed -rc2 by a few hours,
> sigh).
Okay, I will try to fix remaning issues in -rc3.
> 
> By the way, in doing some final testing, it appears that we are still
> failing generic/127 with a 1k blocksize.  If I block COLLAPSE_RANGE
> using the patch that everyone but me seems to hate :-), the problem
> goes away.  So we have at least one other issue that needs to be
> looked at.
> 
> You can reproduce by grabbing the dev branch from the ext4.git tree,
> and then cherry-picking the top commit from the unstable branch.
> 
> Then run "kvm-xfstests -c 1k generic/127", with and without the
> following in config.custom:
> 
> EXTRA_ARG="ext4.fallocate_mode_block=0x08"
Okay, I will look at this issue now.

Thanks Ted!!
> 
> Cheers,
> 
> 						- Ted

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