Hi !
i think everybody knows bind mounts.
i can do:
touch /otherpath/dummyfile
mount -bind /path/file /otherpath/dummyfile
so /path/file becomes accessible via /otherpath/dummyfile - dummyfile has the same size as file after successful bind-mount
i can loopback-mount /otherpath/dummyfile to /otherpath/mnt if file/dummyfile contains a filesystem
when i export /otherpath via nfs (crossmnt), from the client side i can access the contents of the filesystem inside file/dummyfile via /otherpath/mnt - but i cannot access the contents of dummyfile itself, i.e. the bind-mount seems to get lost on export.
can someone tell if this is expected behaviour or if this is a bug ?
regards
roland
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On Sat, 2007-11-10 at 22:36 +0100, [email protected] wrote:
> Hi !
>
> i think everybody knows bind mounts.
>
> i can do:
>
> touch /otherpath/dummyfile
> mount -bind /path/file /otherpath/dummyfile
>
> so /path/file becomes accessible via /otherpath/dummyfile - dummyfile has the same size as file after successful bind-mount
>
> i can loopback-mount /otherpath/dummyfile to /otherpath/mnt if file/dummyfile contains a filesystem
>
> when i export /otherpath via nfs (crossmnt), from the client side i can access the contents of the filesystem inside file/dummyfile via /otherpath/mnt - but i cannot access the contents of dummyfile itself, i.e. the bind-mount seems to get lost on export.
>
> can someone tell if this is expected behaviour or if this is a bug ?
The NFS client will not cross a mount point unless the target is a
directory. That is not a bug, it is expected behaviour.
Trond
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ok, that explains why bind-mounting and exporting directories works, but no=
t files.
thanks!
=
> -----Urspr=FCngliche Nachricht-----
> Von: Trond Myklebust <[email protected]>
> Gesendet: 10.11.07 23:26:35
> An: [email protected]
> CC: [email protected]
> Betreff: Re: [NFS] nfs exports & bind mounts
> =
> =
> On Sat, 2007-11-10 at 22:36 +0100, [email protected] wrote:
> > Hi !
> > =
> > i think everybody knows bind mounts.
> > =
> > i can do:
> > =
> > touch /otherpath/dummyfile
> > mount -bind /path/file /otherpath/dummyfile
> > =
> > so /path/file becomes accessible via /otherpath/dummyfile - dummyfile h=
as the same size as file after successful bind-mount
> > =
> > i can loopback-mount /otherpath/dummyfile to /otherpath/mnt if file/dum=
myfile contains a filesystem
> > =
> > when i export /otherpath via nfs (crossmnt), from the client side i can=
access the contents of the filesystem inside file/dummyfile via /otherpath=
/mnt - but i cannot access the contents of dummyfile itself, i.e. the bind=
-mount seems to get lost on export.
> > =
> > can someone tell if this is expected behaviour or if this is a bug ?
> =
> The NFS client will not cross a mount point unless the target is a
> directory. That is not a bug, it is expected behaviour.
> =
> Trond
> =
> =
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