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Message-ID: <20080513102340.GA15112@infradead.org> Date: Tue, 13 May 2008 06:23:40 -0400 From: Christoph Hellwig <hch@...radead.org> To: David Chinner <dgc@....com> Cc: lkml <linux-kernel@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, util-linux-ng@...r.kernel.org Subject: Re: [BUG] remount ro on loopback mount leaves unmountable filesystem behind On Tue, May 13, 2008 at 06:50:47PM +1000, David Chinner wrote: > Same thing, but remounting the loop filesystem readonly > before unmounting: > > $ mount -t xfs /dev/sdb6 /mnt/scratch > $ mkdir /mnt/scratch/mnt > $ touch /mnt/scratch/img > $ mkfs.xfs -f -d file,name=/mnt/scratch/img,size=1g > $ mount -t xfs -o loop /mnt/scratch/img /mnt/scratch/mnt > $ mount -t xfs -o remount,ro /mnt/scratch/img /mnt/scratch/mnt > $ umount /mnt/scratch/mnt > $ umount /mnt/scratch > umount: /mnt/scratch: device is busy > umount: /mnt/scratch: device is busy This is a problem in mount, no the kernel. Before the remount the /etc mtab looks something like this: /qemu/test.img /mnt xfs rw,loop=/dev/loop0 0 0 and after it looks something like this: /qemu/test.img /mnt xfs ro 0 0 As a workaround do a losetup -d /dev/loop0 after unmounting the filesystem. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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