Date: Mon, 07 May 2007 10:01:10 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: Kostik Belousov <kostikbel@gmail.com> Cc: Roman Divacky <rdivacky@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: [ANN] unionfs patchset-19-20070504 release, it is now MPSAFE and transparent mode as default Message-ID: <E1HkxDa-00082U-3D@cs1.cs.huji.ac.il> In-Reply-To: <20070506160056.GE83173@deviant.kiev.zoral.com.ua> References: <E1HkcCT-0004uW-76@cs1.cs.huji.ac.il> <20070506093034.GA42976@freebsd.org> <20070506160056.GE83173@deviant.kiev.zoral.com.ua>
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> On Sun, May 06, 2007 at 11:30:34AM +0200, Roman Divacky wrote: > > > Hi, > > > So far I've tested it under -current, in my diskless env. where > > > /etc & /compat/linux are unionfs'ed with a mfs, and so all seems OK. > >=20 > > there's an XXX in the linuxulator code saying: > >=20 > > XXX Untested vs. mount -o union; probably does the wrong thing. > >=20 > > can you confirm that it works ok with unionfs from daichi? > > There are to quite different union-kind things in kernel. One is the -o uni= > on > option for the mount, see mount(2). Second is unionfs proper. > > The first thing (-o union) requires support in namei and related syscalls, > like getdirentries. It is implemented for native freebsd getdirentries (both > current and 4-compat variants), but, AFAIR, is _not_ implemented in > compat syscalls implementations for sysv, linux, xenix etc. And, in fact, > making that compat syscalls behave is somewhat tricky due to cookies and > differences between supposed output formats for ABIs. > > Unionfs shall have no real difference in behaviour what used from processes > using compat ABIs. > well, it seems that there is a problem: I have /compat/linux union mounted with a memory fs - because / is diskless, and linux likes to write to etc, var), so far, so good, but mount -t linprocfs linproc /compat/linux/proc failes: mountd[874]: can't delete exports for /home/dist/local/amd64=FreeBSD_7.0/compat /linux/proc: Invalid argument unionfs does not support mount update though I don't think the problem is in the unionfs code ... danny
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