| title: | Re PATCH 00 32 VFS based Union Mount V3 |
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On Mon, 08 Jun 2009, Valerie Aurora wrote:
On Thu, May 21, 2009 at 02:54:19PM +0200, Jan Rekorajski wrote:
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 as the read-only layer ought to work. NFS as the read-write layer
is still up in the air.
As I dont need rw NFS, i didnt even try that :)
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:
doesnt 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.
FYI, using --union on the first mount will make it union with the
local directory below it. The --union option is not needed when you
mount the lower read-only layer.
Thanks for clarification.
Youll get -EBUSY on the second mount of any NFS file system over
another - try it again with the --union flag. Support for NFS on NFS
union mount would have to change this.
I did just that, --union didnt change standard NFS behaviour.
mount -t nfs server:/export/system /mnt
mount --union -t nfs server:/export/profile /mnt
mount.nfs: /mnt is busy or already mounted
I did an experiment by using different IP of the server (same machine)
when mounting the second fs, mount worked then, but ls -1 /mnt oopsed.
I can reproduce this and send you the oops next week.
--
Jan Rekorajski | ALL SUSPECTS ARE GUILTY. PERIOD!
baggins<at mimuw.edu.pl | OTHERWISE THEY WOULDNT BE SUSPECTS, WOULD THEY?
BOFH, MANIAC | -- TROOPS by Kevin Rubio
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