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Re: [PATCH 0/10] freeze feature ver 1.13

To: Valdis.Kletnieks@xxxxxx
Subject: Re: [PATCH 0/10] freeze feature ver 1.13
From: Dave Kleikamp <shaggy@xxxxxxxxxxxxxxxxxx>
Date: Fri, 26 Sep 2008 16:26:58 -0500
Cc: Takashi Sato <t-sato@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>, "dm-devel@xxxxxxxxxx" <dm-devel@xxxxxxxxxx>, "viro@xxxxxxxxxxxxxxxxxx" <viro@xxxxxxxxxxxxxxxxxx>, "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, "mtk.manpages@xxxxxxxxxxxxxx" <mtk.manpages@xxxxxxxxxxxxxx>, "axboe@xxxxxxxxx" <axboe@xxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <30536.1222426096@xxxxxxxxxxxxxxxxxxxxxxx>
References: <20080926175652t-sato@xxxxxxxxxxxxxxx> <30536.1222426096@xxxxxxxxxxxxxxxxxxxxxxx>
On Fri, 2008-09-26 at 06:48 -0400, Valdis.Kletnieks@xxxxxx wrote:
> On Fri, 26 Sep 2008 17:56:52 +0900, Takashi Sato said:

> Would it be a good idea to merge patch 10 into patch 8?   Otherwise, there's
> two issues I can see:
> 1) A mostly theoretical problem if a bisect lands exactly on patch 9 it can
> hit the deadlock.

Really, there's no deadlock until someone uses the new function, so
that's not really an issue, is it?  However, this patchset breaks
bisection anyway.

A bisect anywhere between patch 1 and 7 will cause some number of
filesystems to fail to compile.  Patches 1-7 either need to be combined
into one, or patch 1 needs to add freeze_fs and unfreeze_fs while
leaving write_super_lockfs and unlockfs, then a patch between 7 and 8
could remove write_super_lockfs and unlockfs.

> 2) The API at patch 8 and patch 10 differs, that's going to make testing 
> through
> a bisection of this patch series a pain.

There's no need to test the new interface during a bisection.  Bisection
is important in testing regressions, but not new function.
David Kleikamp
IBM Linux Technology Center

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