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fanchaoting 5a12cca697 umount oops when remove blocklayoutdriver first 
now pnfs client uses block layout, maybe we can remove
blocklayoutdriver first. if we umount later,
it can cause oops in unset_pnfs_layoutdriver.
because nfss->pnfs_curr_ld->clear_layoutdriver is invalid.

reproduce it:
 modprobe  blocklayoutdriver
 mount -t nfs4 -o minorversion=1 pnfsip:/ /mnt/
 rmmod blocklayoutdriver
 umount /mnt

then you can see following

CPU 0
Pid: 17023, comm: umount.nfs4 Tainted: GF          O 3.7.0-rc6-pnfs #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
RIP: 0010:[<ffffffffa04cfe6d>]  [<ffffffffa04cfe6d>] unset_pnfs_layoutdriver+0x1d/0x70 [nfsv4]
RSP: 0018:ffff8800022d9e48  EFLAGS: 00010286
RAX: ffffffffa04a1b00 RBX: ffff88000b013800 RCX: 0000000000000001
RDX: ffffffff81ae8ee0 RSI: ffff880001ee94b8 RDI: ffff88000b013800
RBP: ffff8800022d9e58 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880001ee9400
R13: ffff8800105978c0 R14: 00007fff25846c08 R15: 0000000001bba550
FS:  00007f45ae7f0700(0000) GS:ffff880012c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffffffffa04a1b38 CR3: 0000000002c0c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process umount.nfs4 (pid: 17023, threadinfo ffff8800022d8000, task ffff880006e48aa0)
Stack:
ffff8800105978c0 ffff88000b013800 ffff8800022d9e78 ffffffffa04cd0ce
ffff8800022d9e78 ffff88000b013800 ffff8800022d9ea8 ffffffffa04755a7
ffff8800022d9ea8 ffff880002f96400 ffff88000b013800 ffff880002f96400
Call Trace:
[<ffffffffa04cd0ce>] nfs4_destroy_server+0x1e/0x30 [nfsv4]
[<ffffffffa04755a7>] nfs_free_server+0xb7/0x150 [nfs]
[<ffffffffa047d4d5>] nfs_kill_super+0x35/0x40 [nfs]
[<ffffffff81178d35>] deactivate_locked_super+0x45/0x70
[<ffffffff8117986a>] deactivate_super+0x4a/0x70
[<ffffffff81193ee2>] mntput_no_expire+0xd2/0x130
[<ffffffff81194d62>] sys_umount+0x72/0xe0
[<ffffffff8154af59>] system_call_fastpath+0x16/0x1b
Code: 06 e1 b8 ea ff ff ff eb 9e 0f 1f 44 00 00 55 48 89 e5 53 48 83 ec 08 66 66 66 66 90 48 8b 87 80 03 00 00 48 89 fb 48 85 c0 74 29 <48> 8b 40 38 48 85 c0 74 02 ff d0 48 8b 03 3e ff 48 04 0f 94 c2
RIP  [<ffffffffa04cfe6d>] unset_pnfs_layoutdriver+0x1d/0x70 [nfsv4]
RSP <ffff8800022d9e48>
CR2: ffffffffa04a1b38
---[ end trace 29f75aaedda058bf ]---

Signed-off-by: fanchaoting<fanchaoting@cn.fujitsu.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org
 		2013-02-17 15:40:15 -05:00
..
blocklayout umount oops when remove blocklayoutdriver first 2013-02-17 15:40:15 -05:00
objlayout umount oops when remove blocklayoutdriver first 2013-02-17 15:40:15 -05:00
Kconfig
…
Makefile NFSv4.1: Cleanup move session slot management to fs/nfs/nfs4session.c 2012-12-06 00:30:45 +01:00
cache_lib.c
…
cache_lib.h
…
callback.c
…
callback.h NFSv4.1: Clean up session draining 2012-12-06 00:30:44 +01:00
callback_proc.c NFSv4.1: Fix bulk recall and destroy of layouts 2013-02-14 13:22:50 -05:00
callback_xdr.c NFSv4.1: Move slot table and session struct definitions to nfs4session.h 2012-12-06 00:30:46 +01:00
client.c NFS: avoid NULL dereference in nfs_destroy_server 2012-12-12 23:55:56 -05:00
delegation.c NFSv4: Ensure delegation recall and byte range lock removal don't conflict 2013-02-11 15:33:13 -05:00
delegation.h NFSv4.1: Don't lose locks when a server reboots during delegation return 2013-02-11 15:33:12 -05:00
dir.c NFS: Fix access to suid/sgid executables 2013-01-03 17:06:27 -05:00
direct.c nfs: fix page dirtying in NFS DIO read codepath 2012-12-12 12:56:19 -05:00
dns_resolve.c
…
dns_resolve.h
…
file.c lseek: the "whence" argument is called "whence" 2012-12-17 17:15:12 -08:00
fscache-index.c
…
fscache.c NFS4: Open files for fscaching 2012-12-20 22:19:42 +00:00
fscache.h NFS: Provide stub nfs_fscache_wait_on_invalidate() for when CONFIG_NFS_FSCACHE=n 2012-12-21 08:06:48 -08:00
getroot.c nfs: remove kfree() redundant null checks 2013-02-17 15:27:21 -05:00
idmap.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2012-12-16 15:40:50 -08:00
inode.c Revert "NFS: add nfs_sb_deactive_async to avoid deadlock" 2013-02-01 10:13:48 -05:00
internal.h Revert "NFS: add nfs_sb_deactive_async to avoid deadlock" 2013-02-01 10:13:48 -05:00
iostat.h
…
mount_clnt.c
…
namespace.c NFS: Don't silently fail setattr() requests on mountpoints 2013-01-30 17:41:04 -05:00
netns.h
…
nfs.h
…
nfs2super.c
…
nfs2xdr.c
…
nfs3acl.c
…
nfs3client.c
…
nfs3proc.c SUNRPC handle EKEYEXPIRED in call_refreshresult 2012-12-12 15:36:02 -05:00
nfs3super.c
…
nfs3xdr.c
…
nfs4_fs.h NFSv4: Ensure delegation recall and byte range lock removal don't conflict 2013-02-11 15:33:13 -05:00
nfs4client.c NFSv4.1: Ensure that nfs41_walk_client_list() does start lease recovery 2013-01-27 15:51:41 -05:00
nfs4file.c NFS4: Open files for fscaching 2012-12-20 22:19:42 +00:00
nfs4filelayout.c SUNRPC handle EKEYEXPIRED in call_refreshresult 2012-12-12 15:36:02 -05:00
nfs4filelayout.h
…
nfs4filelayoutdev.c NFSv4.1: Cleanup move session slot management to fs/nfs/nfs4session.c 2012-12-06 00:30:45 +01:00
nfs4getroot.c
…
nfs4namespace.c
…
nfs4proc.c NFSv4.1: Don't decode skipped layoutgets 2013-02-17 15:24:16 -05:00
nfs4renewd.c
…
nfs4session.c NFSv4.1: Deal effectively with interrupted RPC calls. 2012-12-15 15:39:59 -05:00
nfs4session.h NFSv4.1: Deal effectively with interrupted RPC calls. 2012-12-15 15:39:59 -05:00
nfs4state.c NFSv4: Ensure delegation recall and byte range lock removal don't conflict 2013-02-11 15:33:13 -05:00
nfs4super.c NFS: Ensure that we always drop inodes that have been marked as stale 2012-12-14 14:36:36 -05:00
nfs4sysctl.c
…
nfs4xdr.c Merge branch 'bugfixes' into nfs-for-next 2012-12-11 09:16:26 -05:00
nfsroot.c
…
pagelist.c
…
pnfs.c NFSv4.1: Fix bulk recall and destroy of layouts 2013-02-14 13:22:50 -05:00
pnfs.h NFSv4.1: Fix bulk recall and destroy of layouts 2013-02-14 13:22:50 -05:00
pnfs_dev.c
…
proc.c SUNRPC handle EKEYEXPIRED in call_refreshresult 2012-12-12 15:36:02 -05:00
read.c NFS: Ensure that we free the rpc_task after read and write cleanups are done 2013-01-04 12:59:10 -05:00
super.c Revert "NFS: add nfs_sb_deactive_async to avoid deadlock" 2013-02-01 10:13:48 -05:00
symlink.c
…
sysctl.c
…
unlink.c nfs: remove kfree() redundant null checks 2013-02-17 15:27:21 -05:00
write.c NFS: Ensure that we free the rpc_task after read and write cleanups are done 2013-01-04 12:59:10 -05:00