Re: [PATCH 1/5] Forking ext4 filesystem from ext3 filesystem

From: Mingming Cao
Date: Thu Aug 10 2006 - 12:39:41 EST

Andrew Morton wrote:

On Wed, 09 Aug 2006 18:17:02 -0700
Mingming Cao <cmm@xxxxxxxxxx> wrote:

Fork(copy) ext4 filesystem from ext3 filesystem. Rename all functions in ext4 from ext3_xxx() to ext4_xxx().

It would have been nice to spend a few hours cleaning up ext3 and JBD
before doing this. The code isn't toooo bad, but there are number of
coding style problems, whitespace screwups, incorrect comments, missing
comments, poorly-chosen variable names and all of that sort of thing.

One the fs has been copied-and-pasted, it's much harder to address these
things: either need to do it twice, or allow the filesystems to diverge, or
not do it.

Andrew, thanks for taking a close look this series of changes.

I agree with you that the timing is right, to do the clean up now rather than later. I would give it a try. If I could get more help from more code reviewer, it probably makes the effort a lot easier. For those issues you pointed out : coding style problem£¬incorrect comments, poorly-named variables -- do you have any specific examples in your mind?

Also, -mm presently has two patches pending against fs/jbd/ and nine pending
against fs/ext3/. We should get all those things merged before taking the

So probably the right thing to do is keep the ext4 patches against mm tree instead of rc three?

Also, JBD is presently feeding into submit_bh() buffer_heads which span two
machine pages, and some device drivers spit the dummy. It'd be better to
fix that once, rather than twice..

Okay, I will look at it.


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