linux-kernel - mark_files_ro && sb_end

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Message-ID: <20121026152312.GA13725@redhat.com>
Date:	Fri, 26 Oct 2012 17:23:12 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Mikulas Patocka <mpatocka@...hat.com>,
	Al Viro <viro@...IV.linux.org.uk>
Cc:	Dave Chinner <david@...morbit.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: mark_files_ro && sb_end_write

On 10/26, Oleg Nesterov wrote:
>
> As for the changing fs/namespace.c to use percpu_rwsem, I am not sure
> it is that simple and even worthwhile but I won't argue, I do not
> pretend I understand this code.

BTW, speaking about these counters...

Is mark_files_ro()->mnt_drop_write_file() properly balanced?
__mnt_drop_write() looks fine, but sb_end_write?

Oleg.

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