Re: [PATCH 00/32] VFS based Union Mount (V3)

[Jan Rekorajski]

On Mon, 18 May 2009, Jan Blunck wrote:

> Here is another post of the VFS based union mount implementation.

Is there any chance this will support NFS? I can union-mount tmpfs over
nfs mounted fs, but if I try to mount --union two NFS filesystems I
always get -EBUSY on second mount on the same mountpoint.

Something along these lines:

doesn't matter if I use --union on first mount, the result is always the
same.

mount <--union> -t nfs server:/export/system /mnt
OK
mount --union -t nfs server:/export/profile /mnt
mount.nfs: /mnt is busy or already mounted

I patched mount.nfs so it knows about MS_UNION, and strace shows me that
it passes that flag to kernel.

Jan
-- 
Jan Rekorajski            |  ALL SUSPECTS ARE GUILTY. PERIOD!
baggins<at>mimuw.edu.pl   |  OTHERWISE THEY WOULDN'T BE SUSPECTS, WOULD THEY?
BOFH, MANIAC              |                   -- TROOPS by Kevin Rubio
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