Phil, Big thanks for this fix!
I just updated to the latest CVS Trunk, built, installed and tested the kernel module out on an Arch system running 2.6.32. All of the filesystem operations I've tried so far on the mounted pvfs2 filesystem appear to be functioning normally. Thanks again, -Andrew On Wed, Jan 27, 2010 at 2:50 PM, Phil Carns <[email protected]> wrote: > The better fix is in CVS now (no patch needed). As far as I know this > should work fine on 2.6.32. > > -Phil > > > Phil Carns wrote: > >> Whoops- actually you may notice a difference in functionality if you >> happen to use mmap() on PVFS :) It will work but gradually leak memory over >> time. >> >> I'll have a better fix (that doesn't break mmap) soon. >> >> -Phil >> >> Phil Carns wrote: >> >>> Hi Andrew and Milo, >>> >>> If you are still interested in trying PVFS on 2.6.32, could you try the >>> current CVS version of PVFS along with the attached patch? >>> >>> This isn't the final fix, but it would be helpful if you could confirm >>> that it at least works around the problem. This patch keeps the module from >>> using the kernel's BDI infrastructure, which changed quite a bit in 2.6.32. >>> You shouldn't notice any difference in functionality. >>> >>> thanks! >>> -Phil >>> >>> Andrew Fischer wrote: >>> >>>> Not to jump in unannounced, but I just saw this same behavior on my >>>> system. >>>> >>>> I built the CVS branch pvfs-2-8-branch against the 2.6.32 kernel >>>> today. Loading the module results in the same warning: >>>> WARNING: at fs/super.c:954 vfs_kern_mount >>>> >>>> And trying to access the mount point, either with a file operation or >>>> a simple 'ls' results in: >>>> BUG: unable to handle kernel NULL pointer dereference >>>> >>>> This also hangs the machine, requiring a reboot. In my case, I was the >>>> root user at the time. >>>> >>>> build a module for the 2.6.32 kernel, >>>>> >>>>> Message: 1 >>>>> Date: Tue, 5 Jan 2010 17:50:56 -0500 >>>>> From: Milo <[email protected]> >>>>> Subject: [Pvfs2-users] PVFS2 (cvs) on Kernel 2.6.32 >>>>> To: Sam Lang <[email protected]> >>>>> Cc: Jason Sommerfield <[email protected]>, pvfs2-users >>>>> <[email protected]> >>>>> Message-ID: <[email protected]> >>>>> Content-Type: text/plain; charset=us-ascii >>>>> >>>>> Hi, Sam. We've recently tried to use your pvfs-2-8-branch CVS branch to >>>>> build a module for the 2.6.32 kernel, following your instructions to >>>>> Christian. We're getting the following kernel panics, however. The >>>>> following >>>>> is from Jason Sommerfield's email to me: >>>>> >>>>> When I run the init script that loads the kernel module, the following >>>>> comes >>>>> up on the serial console (but the system does NOT crash): >>>>> >>>> -- Andrew Fischer Lightning Toads Productions, LLC www.lightningtoads.com
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