Messages in this thread | | | Date | Tue, 27 Jul 2004 00:30:30 +0200 | From | Herbert Poetzl <> | Subject | Re: bug with multiple mounts of filesystems in 2.6 |
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On Mon, Jul 26, 2004 at 05:33:07PM -0400, Mike Waychison wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Trond Myklebust wrote: > > På må , 26/07/2004 klokka 12:29, skreiv John S J Anderson: > > > >> Hi -- > >> > >> We're working on migrating to the 2.6 kernel series, and one big > >> problem has popped up: we have a number of NFS mounts that are > >> mounted read-only in one location and read-write in a distinct > >> location (on the same machine). With 2.4 series kernels, this worked > >> without issue, but with 2.6, it doesn't: it's not possible to mount > >> the same filesystem twice with different options for each mount; the > >> two mount points have to share the same mount options. > > > > That behaviour is no longer supported as it meant that you would have > > different superblocks (and hence different out-of-sync caches) between > > the 2 mountpoint. It is in any case not a behaviour that is supported on > > any other Linux filesystems. > > How is this any different than having two seperate nfs clients accessing > the same nfs export? > > > If you want readonly to be an exception, then you will have to move the > > MS_RDONLY flag from being a superblock option to being a vfsmount > > option, then propagate that vfsmount information down to all the tests > > of IS_RDONLY(inode). Not a trivial task, and not one that looms high on > > my list of priorities... > > What ever happened to the bind ro patches that were floating around a > couple months ago? > (http://marc.theaimsgroup.com/?t=107932320200005&r=1&w=2) > > What is left in getting this done? Just the touch_file bit Viro > commented on?
started with the noatime/nodiratime stuff for inclusion but that patch was neither commented nor included, so I put it on hold ... currently I'm planning to update this for 2.6.8 ... we'll see ...
best, Herbert
> - -- > Mike Waychison > Sun Microsystems, Inc. > 1 (650) 352-5299 voice > 1 (416) 202-8336 voice > http://www.sun.com > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > NOTICE: The opinions expressed in this email are held by me, > and may not represent the views of Sun Microsystems, Inc. > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.2.4 (GNU/Linux) > > iD4DBQFBBXiTdQs4kOxk3/MRAp2CAJ9hLA43GX7breEAuFJp++noSX7hAQCYn7yw > FXXelAMC/NCetjqwC8Q67g== > =rQRx > -----END PGP SIGNATURE----- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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