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From: Valerie Aurora <vaurora@redhat.com>
To: Jan Rekorajski <baggins@sith.mimuw.edu.pl>,
	Jan Blunck <jblunck@suse.de>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	viro@zeniv.linux.org.uk, bharata@in.ibm.com, dwm
Subject: Re: [PATCH 00/32] VFS based Union Mount (V3)
Date: Wed, 17 Jun 2009 23:23:57 -0400	[thread overview]
Message-ID: <20090618032357.GE15048@shell> (raw)
In-Reply-To: <20090615095528.GG4379@sith.mimuw.edu.pl>

On Mon, Jun 15, 2009 at 11:55:28AM +0200, Jan Rekorajski wrote:
> On Mon, 08 Jun 2009, Valerie Aurora wrote:
> 
> > On Tue, Jun 09, 2009 at 12:44:06AM +0200, Jan Rekorajski wrote:
> > > On Mon, 08 Jun 2009, Valerie Aurora wrote:
> > > 
> > > > You'll 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 didn't change standard NFS behaviour.
> > 
> > Er, excuse me - I mean to type "try it again WITHOUT the --union
> > flag."  My apologies!
> 
> I did, see below.
> 
> > > 
> > > 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.
> > 
> > Interesting!  Does this happen without the --union flag?
> 
> Filesystems are exported ro, all mounts nfs3,ro,tcp.
> 
> Without --union:
> 
> mount -t nfs 10.1.0.4:/nfs/system /mnt -oro,nolock,vers=3,tcp
> OK
> 
> mount -t nfs 10.1.0.4:/nfs/profile /mnt -oro,nolock,vers=3,tcp
> -EBUSY (as expected)
> 
> mount -t nfs 10.1.0.3:/nfs/profile /mnt -oro,nolock,vers=3,tcp
>  (notice different IP - but it's the same machine)
> Works, just overmounts /mnt, ls shown contents of /nfs/profile
> 
> Now, --union:
> 
> mount -t nfs 10.1.0.4:/nfs/system /mnt -oro,nolock,vers=3,tcp
> OK
> 
> mount --union -t nfs 10.1.0.4:/nfs/profile /mnt -oro,nolock,vers=3,tcp
> -EBUSY (/mnt busy or already mounted)
> 
> mount --union -t nfs 10.1.0.3:/nfs/profile /mnt -oro,nolock,vers=3,tcp
>  (notice different IP - but it's the same machine)
> mount command works, ls Oopses:

Sorry for the delay in reply!  This is on our to-do list, thanks for
doing a little more testing.

-VAL

  reply	other threads:[~2009-06-18  3:25 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-18 16:08 [PATCH 00/32] VFS based Union Mount (V3) Jan Blunck
2009-05-18 16:08 ` [PATCH 01/32] atomic: Only take lock when the counter drops to zero on UP as well Jan Blunck
2009-05-18 16:08 ` [PATCH 02/32] VFS: BUG() if somebody tries to rehash an already hashed dentry Jan Blunck
2009-05-18 16:08 ` [PATCH 03/32] VFS: propagate mnt_flags into do_loopback Jan Blunck
2009-05-18 16:09 ` [PATCH 04/32] VFS: Make lookup_hash() return a struct path Jan Blunck
2009-05-18 16:09 ` [PATCH 05/32] VFS: Remove unnecessary micro-optimization in cached_lookup() Jan Blunck
2009-05-18 16:09 ` [PATCH 06/32] VFS: Make real_lookup() return a struct path Jan Blunck
2009-05-18 16:09 ` [PATCH 07/32] VFS: Introduce dput() variant that maintains a kill-list Jan Blunck
2009-05-18 16:09 ` [PATCH 08/32] whiteout: Don't return information about whiteouts to userspace Jan Blunck
2009-05-18 16:09 ` [PATCH 09/32] whiteout: Add vfs_whiteout() and whiteout inode operation Jan Blunck
2009-05-18 16:09 ` [PATCH 10/32] whiteout: Set S_OPAQUE inode flag when creating directories Jan Blunck
2009-05-18 16:09 ` [PATCH 11/32] whiteout: Add whiteout support to tmpfs Jan Blunck
2009-05-18 16:09 ` [PATCH 12/32] whiteout: Split of ext2_append_link() from ext2_add_link() Jan Blunck
2009-05-18 16:09 ` [PATCH 13/32] whiteout: Add whiteout support to ext2 Jan Blunck
2009-05-18 16:09 ` [PATCH 14/32] whiteout: Add path_whiteout() helper Jan Blunck
2009-05-18 16:09 ` [PATCH 15/32] union-mount: Documentation Jan Blunck
2009-05-25  6:25   ` hooanon05
2009-05-25  8:03     ` Arnd Bergmann
2009-05-25  8:43       ` hooanon05
2009-06-18 19:05         ` Valerie Aurora
2009-06-19  1:53           ` hooanon05
2009-05-18 16:09 ` [PATCH 16/32] union-mount: Introduce MNT_UNION and MS_UNION flags Jan Blunck
2009-05-18 16:09 ` [PATCH 17/32] union-mount: Introduce union_mount structure Jan Blunck
2009-05-18 16:09 ` [PATCH 18/32] union-mount: Drive the union cache via dcache Jan Blunck
2009-05-18 16:09 ` [PATCH 19/32] union-mount: Some checks during namespace changes Jan Blunck
2009-05-18 16:09 ` [PATCH 20/32] union-mount: Changes to the namespace handling Jan Blunck
2009-05-18 16:09 ` [PATCH 21/32] union-mount: Make lookup work for union-mounted file systems Jan Blunck
2009-05-19 16:15   ` Miklos Szeredi
2009-05-19 17:30     ` Valerie Aurora
2009-05-20 10:21       ` Miklos Szeredi
2009-05-18 16:09 ` [PATCH 22/32] union-mount: stop lookup when directory has S_OPAQUE flag set Jan Blunck
2009-05-18 16:09 ` [PATCH 23/32] union-mount: stop lookup when finding a whiteout Jan Blunck
2009-05-18 16:09 ` [PATCH 24/32] union-mount: in-kernel file copy between union mounted filesystems Jan Blunck
2009-05-18 16:09 ` [PATCH 25/32] union-mount: check for logically empty directory (FIXME) Jan Blunck
2009-05-18 16:09 ` [PATCH 26/32] union-mount: call do_whiteout() on unlink and rmdir Jan Blunck
2009-05-18 16:09 ` [PATCH 27/32] union-mount: Always create topmost directory on open Jan Blunck
2009-05-18 16:09 ` [PATCH 28/32] union-mount: Basic fallthru definitions Jan Blunck
2009-05-18 16:09 ` [PATCH 29/32] union mount: Support for fallthru entries in union mount lookup Jan Blunck
2009-05-18 16:09 ` [PATCH 30/32] union mount: ext2 fallthru support Jan Blunck
2009-05-18 16:32   ` Andreas Dilger
2009-05-19  9:42     ` Jan Blunck
2009-05-19 14:05       ` Andreas Dilger
2009-05-19 16:13         ` Jan Blunck
2009-05-18 16:09 ` [PATCH 31/32] union-mount: tmpfs " Jan Blunck
2009-05-18 16:09 ` [PATCH 32/32] union-mount: Copy up directory entries on first readdir() Jan Blunck
2009-05-18 20:40 ` [PATCH] Userland for VFS based Union Mount (V3) Valerie Aurora
2009-05-21 13:53   ` Andreas Dilger
2009-06-18  3:22     ` Valerie Aurora
2009-05-19  9:48 ` [PATCH 00/32] " Miklos Szeredi
2009-05-19 10:29   ` Jan Blunck
2009-05-19 10:35     ` Miklos Szeredi
2009-05-19 10:39       ` Jan Blunck
2009-05-19 11:54         ` Arnd Bergmann
2009-05-19 12:15           ` Jan Blunck
2009-05-19 12:21             ` Arnd Bergmann
2009-05-19 13:10               ` Jan Blunck
2009-05-19 17:23   ` Valerie Aurora
2009-05-20  9:05     ` Miklos Szeredi
2009-06-08 19:44       ` Valerie Aurora
2009-06-16 15:19         ` Miklos Szeredi
2009-05-21 12:54 ` Jan Rekorajski
2009-06-08 19:57   ` Valerie Aurora
2009-06-08 22:44     ` Jan Rekorajski
2009-06-08 22:48       ` Valerie Aurora
2009-06-15  9:55         ` Jan Rekorajski
2009-06-18  3:23           ` Valerie Aurora [this message]
2009-06-04 11:38 ` Scott James Remnant
2009-06-09 22:15   ` Valerie Aurora

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