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

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Message-ID: <20150109035123.GG22149@ZenIV.linux.org.uk>
Date:	Fri, 9 Jan 2015 03:51:23 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	'linux-ext4' <linux-ext4@...r.kernel.org>,
	"stefanha@...hat.com" <stefanha@...hat.com>
Subject: Re: Can one file system be R/W mounted multiple times in Linux?

On Fri, Jan 09, 2015 at 03:44:16AM +0000, Dexuan Cui wrote:
> 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?

Yes.
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