linux-kernel - Re: [PATCH] Syscalls: reboot: Add options to the reboot syscall to remount filesystems ro

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Message-ID: <1299221723.2735.6.camel@localhost>
Date:	Fri, 04 Mar 2011 08:55:23 +0200
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mark Lord <kernel@...savvy.com>,
	Ken Sumrall <ksumrall@...roid.com>,
	linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Jens Axboe <axboe@...nel.dk>,
	Matthew Wilcox <matthew@....cx>,
	Eric Paris <eparis@...hat.com>,
	Dave Young <hidave.darkstar@...il.com>,
	Jiri Slaby <jslaby@...e.cz>, James Morris <jmorris@...ei.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] Syscalls: reboot: Add options to the reboot syscall to
 remount filesystems ro

On Thu, 2011-03-03 at 15:36 -0800, Linus Torvalds wrote:
> But you're certainly right that it takes less code to open
> /proc/sysrq-trigger and writing a single byte to it than it does to do
> the straightforward "let's just do the normal mount thing".

/proc/sysrq-trigger is sometimes simply disabled for "security reasons".
I'm not sure about Android, but some systems I know do disable it. So I
think /proc/mounts is a cleaner approach.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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