Messages in this thread | | | Date | Mon, 26 Jul 2004 17:33:07 -0400 | From | Mike Waychison <> | Subject | Re: bug with multiple mounts of filesystems in 2.6 |
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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?
- -- Mike Waychison Sun Microsystems, Inc. 1 (650) 352-5299 voice 1 (416) 202-8336 voice http://www.sun.com
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