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android_kernel_google_msm/fs/nfs
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fanchaoting 8e0ed8259d umount oops when remove blocklayoutdriver first 
commit 5a12cca697 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-02-28 06:59:02 -08:00
..
blocklayout umount oops when remove blocklayoutdriver first 2013-02-28 06:59:02 -08:00
objlayout umount oops when remove blocklayoutdriver first 2013-02-28 06:59:02 -08:00
cache_lib.c NFS: remove RPC PipeFS mount point references from NFS cache routines 2012-01-31 18:20:26 -05:00
cache_lib.h NFS: DNS resolver PipeFS notifier introduced 2012-01-31 18:20:26 -05:00
callback.c NFS: hard-code init_net for NFS callback transports 2012-07-16 09:04:40 -07:00
callback.h NFSv4.1: Convert slotid from u8 to u32 2012-02-15 00:19:43 -05:00
callback_proc.c NFSv4: Further clean-ups of delegation stateid validation 2012-03-06 10:32:44 -05:00
callback_xdr.c NFSv4: Rate limit the state manager warning messages 2012-03-12 18:15:22 -04:00
client.c NFS: avoid NULL dereference in nfs_destroy_server 2013-01-11 09:06:54 -08:00
delegation.c NFS: Fix a number of sparse warnings 2012-03-11 15:14:16 -04:00
delegation.h NFSv4.0: Re-establish the callback channel on NFS4ERR_CB_PATHDOWN 2012-03-10 11:54:36 -05:00
dir.c NFS: Fix calls to drop_nlink() 2013-01-11 09:06:54 -08:00
direct.c Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
dns_resolve.c NFS: fix bug in legacy DNS resolver. 2012-11-17 13:16:12 -08:00
dns_resolve.h NFS: DNS resolver cache per network namespace context introduced 2012-01-31 18:20:26 -05:00
file.c nfs: skip commit in releasepage if we're freeing memory for fs-related reasons 2012-08-09 08:31:40 -07:00
fscache-index.c NFS: Use the inode->i_version to cache NFSv4 change attribute information 2011-10-18 09:14:34 -07:00
fscache.c NFS: Fix more NFS debug related build warnings 2012-03-21 09:31:44 -04:00
fscache.h
getroot.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
idmap.c NFS: return -ENOKEY when the upcall fails to map the name 2012-09-14 10:00:16 -07:00
inode.c NFS: Fix the initialisation of the readdir 'cookieverf' array 2012-10-02 10:30:19 -07:00
internal.h nfs: Show original device name verbatim in /proc/*/mount{s,info} 2012-11-17 13:16:11 -08:00
iostat.h
Kconfig SUNRPC/NFS: Add Kbuild dependencies for NFS_DEBUG/RPC_DEBUG 2012-03-20 13:08:26 -04:00
Makefile pnfsblock: add blocklayout Kconfig option, Makefile, and stubs 2011-07-31 12:18:15 -04:00
mount_clnt.c nfsv3: Make v3 mounts fail with ETIMEDOUTs instead EIO on mountd timeouts 2012-11-17 13:16:11 -08:00
namespace.c NFS: Don't silently fail setattr() requests on mountpoints 2013-02-03 18:24:42 -06:00
netns.h NFS: replace global bl_wq with per-net one 2012-03-11 10:57:35 -04:00
nfs2xdr.c SUNRPC: constify the rpc_program 2012-01-31 19:28:20 -05:00
nfs3acl.c NFS: Fix a number of sparse warnings 2012-03-11 15:14:16 -04:00
nfs3proc.c NFS: Fix the initialisation of the readdir 'cookieverf' array 2012-10-02 10:30:19 -07:00
nfs3xdr.c SUNRPC: constify the rpc_program 2012-01-31 19:28:20 -05:00
nfs4_fs.h NFS: Fix following referral mount points with different security 2012-04-27 14:10:02 -04:00
nfs4filelayout.c NFS4.1: remove duplicate variable declaration in filelayout_clear_request_commit 2012-03-24 14:33:26 -04:00
nfs4filelayout.h NFS: remove nfs_inode radix tree 2012-03-10 17:14:10 -05:00
nfs4filelayoutdev.c NFSv4.1 fix page number calculation bug for filelayout decode buffers 2012-04-26 12:23:23 -04:00
nfs4namespace.c nfs: Show original device name verbatim in /proc/*/mount{s,info} 2012-11-17 13:16:11 -08:00
nfs4proc.c NFS: Add sequence_priviliged_ops for nfs4_proc_sequence() 2013-01-11 09:06:54 -08:00
nfs4renewd.c NFSv4: The NFSv4.0 client must send RENEW calls if it holds a delegation 2011-08-24 15:07:37 -04:00
nfs4state.c NFSv4: Keep dropped state owners on the LRU list for a while 2012-04-21 13:01:00 -04:00
nfs4xdr.c NFS: return error from decode_getfh in decode open 2012-10-02 10:30:19 -07:00
nfsroot.c SUNRPC/NFS: Add Kbuild dependencies for NFS_DEBUG/RPC_DEBUG 2012-03-20 13:08:26 -04:00
pagelist.c NFS: remove nfs_inode radix tree 2012-03-10 17:14:10 -05:00
pnfs.c pnfs: defer release of pages in layoutget 2012-09-14 10:00:15 -07:00
pnfs.h pnfs: defer release of pages in layoutget 2012-09-14 10:00:15 -07:00
pnfs_dev.c NFS: Fix more NFS debug related build warnings 2012-03-21 09:31:44 -04:00
proc.c NFS: Remove nfs4_setup_sequence from generic rename code 2012-03-21 09:31:46 -04:00
read.c NFS: put open context on error in nfs_pagein_multi 2012-04-20 14:54:48 -04:00
super.c nfs: fix null checking in nfs_get_option_str() 2013-01-11 09:06:56 -08:00
symlink.c
sysctl.c NFS: Fall back on old idmapper if request_key() fails 2012-02-06 18:48:01 -05:00
unlink.c NFS: Remove nfs4_setup_sequence from generic rename code 2012-03-21 09:31:46 -04:00
write.c NFS: put open context on error in nfs_flush_multi 2012-04-20 14:57:30 -04:00