linux-kernel - Re: [PATCH v2 3/6] ext4: Use ext4_get_block

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Message-ID: <20150703183027.GH9456@thunk.org>
Date:	Fri, 3 Jul 2015 14:30:27 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH v2 3/6] ext4: Use ext4_get_block_write() for DAX

On Fri, Jul 03, 2015 at 10:40:40AM -0400, Matthew Wilcox wrote:
> From: Matthew Wilcox <willy@...ux.intel.com>
> 
> DAX relies on the get_block function either zeroing newly allocated blocks
> before they're findable by subsequent calls to get_block, or marking newly
> allocated blocks as unwritten.  ext4_get_block() cannot create unwritten
> extents, but ext4_get_block_write() can.

To be clear, this patch has no prerequistes or dependencies, right?
That is, it would be fine if I take this through the ext4 git tree?
Or is there a reason or a preference for carrying this patch
somewhere else?

Also, is there a way I can test the DAX functionality in ext4 using
KVM?  If so, can you give me a cheat sheet about how I can do that?

Thanks,

							- Ted
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