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Date: Fri, 9 Jan 2015 06:55:46 -0800 From: Christoph Hellwig <hch@...radead.org> To: Stefan Hajnoczi <stefanha@...hat.com> Cc: Al Viro <viro@...IV.linux.org.uk>, Dexuan Cui <decui@...rosoft.com>, "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>, 'linux-ext4' <linux-ext4@...r.kernel.org> Subject: Re: Can one file system be R/W mounted multiple times in Linux? On Fri, Jan 09, 2015 at 12:01:59PM +0000, Stefan Hajnoczi wrote: > Can you explain under what conditions mounting the same file system > twice will work? > > I guess the kernel is looking up the block device and then sharing the > superblock if the file system is already mounted on this block device? Exactly. > > If I use two loop devices for the same underlying storage it does not > work: Because that's very much the same situation as two different systems trying to mount it. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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