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Message-ID: <CAB9VWqB8z_faPNRJo8+9JWsQFDe507iTxwQK4sctUYGF9zCL4Q@mail.gmail.com> Date: Wed, 20 Jun 2012 19:27:14 +0200 From: Alexander Block <ablock84@...glemail.com> To: kreijack@...ind.it Cc: linux-btrfs@...r.kernel.org, dave@...os.cz, hch@...radead.org, linux-fsdevel@...r.kernel.org, chris.mason@...ionio.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH] Allow cross subvolume reflinks (2nd attempt) On Wed, Jun 20, 2012 at 7:18 PM, Goffredo Baroncelli <kreijack@...ero.it> wrote: > Hi Alexander, > > On 06/20/2012 12:35 PM, Alexander Block wrote: >> The patch also does proper vfs mount checks, so cross mount >> point reflinks are not possible with this patch. It only allows cross >> reflinks between two subvolumes which are in the same mount point. > > Thanks for working on that. What happens if two subvolumes of the same > filesystem are mounted on two different places ? > > I usually do: > mount -o subvol=__active /dev/sdX / > mount -o subvol=. /dev/sdX /var/btrfs > > So two different subvolumes of the same filesystem (the one on /dev/sdX) > are mounted on two different places. > > Is it possible to do > cp --reflink /tmp/foo /var/btrfs/tmp/foo2 This will fail with -EXDEV. The patch explicitly forbids reflinks crossing vfs mount boundaries. > > Thanks > G.Baroncelli > -- 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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