linux-ext4 - [PATCH 0/8] remove lock and unlock super

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Message-ID: <502CC477.4060005@gmail.com>
Date:	Thu, 16 Aug 2012 11:59:19 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	bharrosh@...asas.com, bhalevy@...ian.com, jack@...e.cz,
	Andrew Morton <akpm@...ux-foundation.org>,
	adilger.kernel@...ger.ca, tytso@....edu,
	hirofumi@...l.parknet.co.jp, mikulas@...ax.karlin.mff.cuni.cz,
	Al Viro <viro@...IV.linux.org.uk>, hch@...radead.org,
	dushistov@...l.ru, osd-dev@...n-osd.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: [PATCH 0/8] remove lock and unlock super

Hi all,

I'm trying to remove the functions lock_super/unlock_super and to push 
the lock into each single fs. Currently these fs use these functions: 
ext3, ext4, fat, hpfs, exofs, sysv, ufs. At the moment I used the more 
conservative approach, I created a new mutex s_lock in the private sb 
info for each fs, so nothing change but a couple of notes:

1) exofs/hpfs: they use lock_super only in one function so the lock 
seems completely not needed and I removed it, do you see collateral effect?

2) fat/ufs: they have already got functions to lock the fs with a mutex, 
I don't know at the moment if a general review of the code can give us 
the possibility to "merge" the locks.

Bugs, comments, review are welcome especially from fs maintainers. Maybe 
this work can be a first cleaning, after that each fs can adjust its 
lock policy.

The patch is against 3.6-rc1.

Marco
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