[PATCH 0/3] pnfs: fix a crash when hitting Ctrl+C during LAYOUTGET

[Idan Kedar <idank@tonian.com>]

While working on object layout, we have encountered a general protection fault
in xdr_shrink_bufhead when killing a process performing a lot of reads.

we reproduced it on kernel v3.3 as follows:
* mount an object-based pNFS file system. we used exofs as the MDS. assume the
mount point is /mnt/pnfs
* cp -r /bin /mnt/pnfs
* run:
cd /mnt/pnfs
while while true; do
	echo 3 > /proc/sys/vm/drop_caches; 
	rm -rf bin
	cp -r bin /tmp &
	sleep 1
	kill -s int $!
done
* on my setup it crashed after a couple of minutes, your mileage may vary.

The first patch is the actual fix. the other two are cleanups.

Idan Kedar (3):
  pnfs: defer release of pages in layoutget
  pnfs: nfs4_proc_layoutget returns void
  pnfs: use size_t for LAYOUTGET response pages count

 fs/nfs/nfs4proc.c |   61 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 fs/nfs/pnfs.c     |   39 +---------------------------------
 fs/nfs/pnfs.h     |    2 +-
 3 files changed, 60 insertions(+), 42 deletions(-)

-- 
1.7.6.5