linux-ext4 - Re: [PATCH 01/21] fs: Replace CURRENT_TIME_SEC with current_fs

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Message-ID: <CABeXuvqO6NsZdabHHiVWRYDNc0qB+jNRAiytR=ZyBV0DUSTEZw@mail.gmail.com>
Date:	Thu, 9 Jun 2016 13:41:10 -0700
From:	Deepa Dinamani <deepa.kernel@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jan Kara <jack@...e.cz>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Al Viro <viro@...iv.linux.org.uk>, y2038@...ts.linaro.org,
	Artem Bityutskiy <dedekind1@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	Evgeniy Dushistov <dushistov@...l.ru>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Jan Kara <jack@...e.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	linux-afs@...ts.infradead.org,
	"Tigran A. Aivazian" <tigran@...azian.fsnet.co.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Jan Harkes <jaharkes@...cmu.edu>, coda@...cmu.edu,
	codalist@...a.cs.cmu.edu, Bob Copeland <me@...copeland.com>,
	linux-karma-devel@...ts.sourceforge.net,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 01/21] fs: Replace CURRENT_TIME_SEC with current_fs_time()

On Thu, Jun 9, 2016 at 12:15 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Thu, Jun 9, 2016 at 12:35 AM, Jan Kara <jack@...e.cz> wrote:
>>
>> You create line longer than 80 characters for affs and reiserfs. Please
>> wrap those lines properly.
>
> No, please do *NOT* do things like that.
>
> These kind of mechanical patches should
>
>  (a) be as mechanical as possible (and see elsewhere about why I think
> 'sb' should be 'inode' and the patch should have been 95% automated
> with a trivial script thanks to that change)
>
>  (b) be made as easy to verify visually as possible.
>
> That (b) means that a conversion should *not* add whitespace fixups or
> add other non-mechanical cleanups, because it's a *lot* easier to see
> that a conversion like
>
> -       inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
> +       inode->i_mtime = inode->i_ctime = current_fs_time(inode);
>
> makes no other changes, but if you start doing line-splitting or other
> transformations (add new variables etc to get at 'sb'), suddenly you
> have to verify the patch at a completely different level.
>
> In other words, it's actually really important to make these kinds of
> bulk changes be very very obvious. Including to the point of making
> them visually easier to scan as a patch by not making any other
> changes.

Thanks for the guidelines.
Only patches 1 and 4 are mechanical.
All others need some kind of inspection/ verification.
I will keep these in mind for updating 1 and 4.

-Deepa
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