linux-ext4 - Can one file system be R/W mounted multiple times in Linux?

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Date:	Fri, 9 Jan 2015 03:44:16 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	'linux-ext4' <linux-ext4@...r.kernel.org>
CC:	"stefanha@...hat.com" <stefanha@...hat.com>
Subject: Can one file system be R/W mounted multiple times in Linux?

The 'mount' utility allows me to mount 1 file systems multiple times at different
mount points, like "mount /dev/sdb1 /a; mount /dev/sdb1 /b".

I tried to write from /a and /b at the same time and it seems everything is OK
and no data corruption happens.
I tried only  ext4 only.

Can somebody please tell me if this usage is safe?

I'm not familiar with the internals of fs.
googling can't find an affirmative answer, I think.

Thanks,
-- Dexuan

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