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From: Valerie Aurora <vaurora@redhat.com>
To: Jan Engelhardt <jengelh@medozas.de>
Cc: Neil Brown <neilb@suse.de>, Miklos Szeredi <miklos@szeredi.hu>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	viro@zeniv.linux.org.uk, jblunck@suse.de, hch@infradead.org
Subject: Re: [PATCH 0/5] hybrid union filesystem prototype
Date: Thu, 23 Sep 2010 15:22:26 -0400	[thread overview]
Message-ID: <20100923192226.GA3536@shell> (raw)
In-Reply-To: <alpine.LNX.2.01.1009231515580.31650@obet.zrqbmnf.qr>

On Thu, Sep 23, 2010 at 03:18:57PM +0200, Jan Engelhardt wrote:
> 
> On ??, Miklos Szeredi wrote:
> On Thursday 2010-09-02 16:25, Jan Engelhardt wrote:
> >>
> >>There ought to be a reason that other implementations offer
> >>doing multiple branches with a single vfsmount.
> >
> >overdesign
> 
> However, those implementations offer changing the branch configuration
> on the fly, e.g. pulling "out" a branch in the middle. With

Seriously.  What is the use case that justifies the complexity of
implementing this feature (correctly)?  We can all think of
theoretical use cases, but which ones are worth the cost?

> "two-branches only" overlayfs, a multi-branch layout would be
> multiple vfsmounts describable by something like "(((a b) c) d)".
> Say you want to remove branch B. (Supposedly) works today in

There's a difference between "works" and "is correct."  Maybe it is
correct; if so, let's see the code review from VFS experts and some
good stress testing.

-VAL

> aufs/unionfs. How do you pull it off with overlayfs? You can't
> umount the (a b) vfsmount because it is used by c.

  reply	other threads:[~2010-09-23 19:23 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-08-26 18:33 [PATCH 0/5] hybrid union filesystem prototype Miklos Szeredi
2010-08-26 18:33 ` [PATCH 1/5] vfs: implement open "forwarding" Miklos Szeredi
2010-08-26 18:33 ` [PATCH 2/5] vfs: make i_op->permission take a dentry instead of an inode Miklos Szeredi
2010-08-26 20:24   ` David P. Quigley
2010-08-27  4:11     ` Neil Brown
2010-08-27 18:13       ` David P. Quigley
2010-08-27 19:21         ` Valerie Aurora
2010-08-27 18:31       ` David P. Quigley
2010-08-26 18:33 ` [PATCH 3/5] vfs: add flag to allow rename to same inode Miklos Szeredi
2010-08-26 18:33 ` [PATCH 4/5] vfs: export do_splice_direct() to modules Miklos Szeredi
2010-08-26 18:33 ` [PATCH 5/5] union: hybrid union filesystem prototype Miklos Szeredi
2010-09-01 21:42   ` Valerie Aurora
2010-09-02  9:19     ` Miklos Szeredi
2010-09-02 21:33       ` Valerie Aurora
2010-09-03  5:10         ` Neil Brown
2010-09-03  9:16           ` Miklos Szeredi
2010-09-09 16:02             ` David P. Quigley
2010-09-03  8:52         ` Miklos Szeredi
2010-09-02 21:42   ` Valerie Aurora
2010-09-03 12:31     ` Miklos Szeredi
2010-08-27  7:05 ` [PATCH 0/5] " Neil Brown
2010-08-27  8:47   ` Miklos Szeredi
2010-08-27 11:35     ` Neil Brown
2010-08-27 16:53       ` Miklos Szeredi
2010-08-29  4:42         ` Neil Brown
2010-08-30 10:18           ` Miklos Szeredi
2010-08-30 11:40             ` Neil Brown
2010-08-30 12:20               ` Miklos Szeredi
2010-08-31 19:18                 ` Valerie Aurora
2010-08-31 20:19                   ` Trond Myklebust
2010-09-01  1:56                     ` Valerie Aurora
2010-09-01  4:04                       ` Trond Myklebust
2010-09-01  4:33               ` Neil Brown
2010-09-01 20:11                 ` Miklos Szeredi
2010-08-31 19:29             ` Valerie Aurora
2010-09-02 13:15             ` Jan Engelhardt
2010-09-02 13:32               ` Neil Brown
2010-09-02 14:25                 ` Jan Engelhardt
2010-09-02 14:28                   ` Miklos Szeredi
2010-09-08 19:47                     ` David P. Quigley
2010-09-23 13:18                   ` Jan Engelhardt
2010-09-23 19:22                     ` Valerie Aurora [this message]
2010-08-30 18:38       ` Valerie Aurora
2010-08-30 23:12         ` Neil Brown
2010-08-31 11:00           ` Miklos Szeredi
2010-08-31 11:24             ` Neil Brown
2010-08-31 15:05               ` Kyle Moffett
2010-08-31 15:05                 ` Kyle Moffett
2010-08-31 20:36                 ` Valerie Aurora

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