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Chuck Lever 5b362ac379 NFS: Fix panic after nfs_umount() 
After a few unsuccessful NFS mount attempts in which the client and
server cannot agree on an authentication flavor both support, the
client panics.  nfs_umount() is invoked in the kernel in this case.

Turns out nfs_umount()'s UMNT RPC invocation causes the RPC client to
write off the end of the rpc_clnt's iostat array.  This is because the
mount client's nrprocs field is initialized with the count of defined
procedures (two: MNT and UMNT), rather than the size of the client's
proc array (four).

The fix is to use the same initialization technique used by most other
upper layer clients in the kernel.

Introduced by commit 0b524123, which failed to update nrprocs when
support was added for UMNT in the kernel.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=24302
BugLink: http://bugs.launchpad.net/bugs/683938

Reported-by: Stefan Bader <stefan.bader@canonical.com>
Tested-by: Stefan Bader <stefan.bader@canonical.com>
Cc: stable@kernel.org # >= 2.6.32
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
 		2010-12-10 13:01:50 -05:00
..
Kconfig lockd: push lock_flocks down 2010-10-27 21:39:39 +02:00
Makefile NFSv4.1: pnfs: filelayout: add driver's LAYOUTGET and GETDEVICEINFO infrastructure 2010-10-24 18:07:11 -04:00
cache_lib.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
cache_lib.h NFS: Add a dns resolver for use with NFSv4 referrals and migration 2009-08-19 18:22:15 -04:00
callback.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
callback.h nfs41: implement cb_recall_slot 2010-02-10 08:30:59 -05:00
callback_proc.c NFS: change stateid to be a union 2010-10-24 18:02:53 -04:00
callback_xdr.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
client.c Merge branch 'for-2.6.37' of git://linux-nfs.org/~bfields/linux 2010-10-26 09:55:25 -07:00
delegation.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
delegation.h NFSv41: Fix nfs_async_inode_return_delegation() ugliness 2010-06-22 13:24:02 -04:00
dir.c NFS: Readdir cleanups 2010-12-07 14:09:02 -05:00
direct.c Pure nfs client performance using odirect. 2010-11-22 13:24:42 -05:00
dns_resolve.c sunrpc: use seconds since boot in expiry cache 2010-09-07 19:21:20 -04:00
dns_resolve.h NFS: Use kernel DNS resolver [ver #2] 2010-08-11 17:11:28 +00:00
file.c NFS: Fix fcntl F_GETLK not reporting some conflicts 2010-12-07 19:30:43 -05:00
fscache-index.c NFS: Add read context retention for FS-Cache to call back with 2009-04-03 16:42:44 +01:00
fscache.c NFS: Squelch compiler warning 2010-05-14 15:09:31 -04:00
fscache.h NFS: Propagate 'fsc' mount option through automounts 2009-09-23 14:36:39 -04:00
getroot.c new helper: ihold() 2010-10-25 21:26:11 -04:00
idmap.c nfs: testing the wrong variable 2010-10-28 11:18:00 -04:00
inode.c NFS: Fix a memory leak in nfs_readdir 2010-12-02 09:58:00 -05:00
internal.h NFS: Ensure we return the dirent->d_type when it is known 2010-11-22 13:24:48 -05:00
iostat.h NFS: Squelch compiler warning in nfs_add_server_stats() 2010-05-14 15:09:31 -04:00
mount_clnt.c NFS: Fix panic after nfs_umount() 2010-12-10 13:01:50 -05:00
namespace.c NFS: Reduce the stack footprint of nfs_follow_mountpoint() 2010-05-14 15:09:22 -04:00
nfs2xdr.c NFS: Ensure we return the dirent->d_type when it is known 2010-11-22 13:24:48 -05:00
nfs3acl.c NFS: Reduce stack footprint of nfs3_proc_getacl() and nfs3_proc_setacl() 2010-05-14 15:09:28 -04:00
nfs3proc.c NFS: readdir with vmapped pages 2010-10-23 15:27:35 -04:00
nfs3xdr.c NFS: Ensure we return the dirent->d_type when it is known 2010-11-22 13:24:48 -05:00
nfs4_fs.h NFS: Readdir plus in v4 2010-10-23 15:27:37 -04:00
nfs4filelayout.c NFSv4.1: Use more sensible names for 'initialize_mountpoint' 2010-10-24 18:07:11 -04:00
nfs4filelayout.h NFSv4.1: pnfs: filelayout: add driver's LAYOUTGET and GETDEVICEINFO infrastructure 2010-10-24 18:07:11 -04:00
nfs4filelayoutdev.c NFSv4.1: pnfs: filelayout: add driver's LAYOUTGET and GETDEVICEINFO infrastructure 2010-10-24 18:07:11 -04:00
nfs4namespace.c NFSv4: Fix up the documentation for nfs_do_refmount 2010-05-14 15:09:29 -04:00
nfs4proc.c nfs: Discard ACL cache on mode update 2010-12-07 19:30:42 -05:00
nfs4renewd.c NFSv41: Convert the various reboot recovery ops etc to minor version ops 2010-06-22 13:24:02 -04:00
nfs4state.c Merge branch 'nfs-for-2.6.37' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6 2010-10-26 09:52:09 -07:00
nfs4xdr.c NFS: Ensure we return the dirent->d_type when it is known 2010-11-22 13:24:48 -05:00
nfsroot.c NFS: Fix a compile issue in nfs_root 2010-10-26 13:56:42 -04:00
pagelist.c nfs: remove extraneous and problematic calls to nfs_clear_request 2010-12-07 23:02:44 -05:00
pnfs.c NFSv4.1: Use more sensible names for 'initialize_mountpoint' 2010-10-24 18:07:11 -04:00
pnfs.h NFSv4.1: Use more sensible names for 'initialize_mountpoint' 2010-10-24 18:07:11 -04:00
proc.c NFS: readdir with vmapped pages 2010-10-23 15:27:35 -04:00
read.c nfs: remove extraneous and problematic calls to nfs_clear_request 2010-12-07 23:02:44 -05:00
super.c nfs: kernel should return EPROTONOSUPPORT when not support NFSv4 2010-12-07 19:30:44 -05:00
symlink.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sysctl.c NFS: new idmapper 2010-10-07 18:48:49 -04:00
unlink.c a couple of open-coded ihold() introduced by nfs merge 2010-10-29 04:14:48 -04:00
write.c nfs: remove extraneous and problematic calls to nfs_clear_request 2010-12-07 23:02:44 -05:00