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Date: Thu, 2 Sep 2010 16:25:47 +0200 (CEST) From: Jan Engelhardt <jengelh@...ozas.de> To: Neil Brown <neilb@...e.de> cc: Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, vaurora@...hat.com, viro@...iv.linux.org.uk, jblunck@...e.de, hch@...radead.org Subject: Re: [PATCH 0/5] hybrid union filesystem prototype On Thursday 2010-09-02 15:32, Neil Brown wrote: >> >> Oh and I what I like to see is support for multiple readonly branches :) > >I think we very nearly have that, assuming I understand your requirement >correctly. >The lower filesystem can itself be an overlay, providing it is mounted >read-only. > >So if /mnt/ro1 /mnt/ro2 /mnt/ro3 are all read-only branches then > > mount -o ro,lowerdir=/mnt/ro1,upperdir=/mnt/ro2 meaninglessstring /mnt/ov1 > mount -o ro,lowerdir=/mnt/ov1,upperdir=/mnt/ro3 meaninglessstring /mnt/ov2 > mount -o lowerdir=/mnt/ov2,upperdir=/mnt/rw ignoreme /mnt/overlay > >and /mnt/overlay will be the combination of 3 read-only filesystems and one >writable one. >(this doesn't work with the code as-is, but it is really just a few bug-fixes >away). There ought to be a reason that other implementations offer doing multiple branches with a single vfsmount. -- 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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