Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Use fh_fsid when reffering to the fsid part of the filehandle.  The
variable length auth field envisioned in nfsfh wasn't ever implemented.
Also clean up some lose ends around this and document the file handle
format better.

Btw, why do we even export nfsfh.h to userspace?  The file handle very
much is kernel private, and nothing in nfs-utils include the header
either.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

commit 4ac7249e have remove all EXPORT_SYMBOL,
linux/export.h is not needed, just clean it.
Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

After setting ACL for directory, I got two problems that caused
by the cached zero-length default posix acl.

This patch make sure nfsd4_set_nfs4_acl calls ->set_acl
with a NULL ACL structure if there are no entries.

Thanks for Christoph Hellwig's advice.

First problem:
............ hang ...........

Second problem:
[ 1610.167668] ------------[ cut here ]------------
[ 1610.168320] kernel BUG at /root/nfs/linux/fs/nfsd/nfs4acl.c:239!
[ 1610.168320] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC
[ 1610.168320] Modules linked in: nfsv4(OE) nfs(OE) nfsd(OE)
rpcsec_gss_krb5 fscache ip6t_rpfilter ip6t_REJECT cfg80211 xt_conntrack
rfkill ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables
ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6
ip6table_mangle ip6table_security ip6table_raw ip6table_filter
ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4
nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw
auth_rpcgss nfs_acl snd_intel8x0 ppdev lockd snd_ac97_codec ac97_bus
snd_pcm snd_timer e1000 pcspkr parport_pc snd parport serio_raw joydev
i2c_piix4 sunrpc(OE) microcode soundcore i2c_core ata_generic pata_acpi
[last unloaded: nfsd]
[ 1610.168320] CPU: 0 PID: 27397 Comm: nfsd Tainted: G           OE
3.15.0-rc1+ #15
[ 1610.168320] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[ 1610.168320] task: ffff88005ab653d0 ti: ffff88005a944000 task.ti:
ffff88005a944000
[ 1610.168320] RIP: 0010:[<ffffffffa034d5ed>]  [<ffffffffa034d5ed>]
_posix_to_nfsv4_one+0x3cd/0x3d0 [nfsd]
[ 1610.168320] RSP: 0018:ffff88005a945b00  EFLAGS: 00010293
[ 1610.168320] RAX: 0000000000000001 RBX: ffff88006700bac0 RCX:
0000000000000000
[ 1610.168320] RDX: 0000000000000000 RSI: ffff880067c83f00 RDI:
ffff880068233300
[ 1610.168320] RBP: ffff88005a945b48 R08: ffffffff81c64830 R09:
0000000000000000
[ 1610.168320] R10: ffff88004ea85be0 R11: 000000000000f475 R12:
ffff880068233300
[ 1610.168320] R13: 0000000000000003 R14: 0000000000000002 R15:
ffff880068233300
[ 1610.168320] FS:  0000000000000000(0000) GS:ffff880077800000(0000)
knlGS:0000000000000000
[ 1610.168320] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1610.168320] CR2: 00007f5bcbd3b0b9 CR3: 0000000001c0f000 CR4:
00000000000006f0
[ 1610.168320] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 1610.168320] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[ 1610.168320] Stack:
[ 1610.168320]  ffffffff00000000 0000000b67c83500 000000076700bac0
0000000000000000
[ 1610.168320]  ffff88006700bac0 ffff880068233300 ffff88005a945c08
0000000000000002
[ 1610.168320]  0000000000000000 ffff88005a945b88 ffffffffa034e2d5
000000065a945b68
[ 1610.168320] Call Trace:
[ 1610.168320]  [<ffffffffa034e2d5>] nfsd4_get_nfs4_acl+0x95/0x150 [nfsd]
[ 1610.168320]  [<ffffffffa03400d6>] nfsd4_encode_fattr+0x646/0x1e70 [nfsd]
[ 1610.168320]  [<ffffffff816a6e6e>] ? kmemleak_alloc+0x4e/0xb0
[ 1610.168320]  [<ffffffffa0327962>] ?
nfsd_setuser_and_check_port+0x52/0x80 [nfsd]
[ 1610.168320]  [<ffffffff812cd4bb>] ? selinux_cred_prepare+0x1b/0x30
[ 1610.168320]  [<ffffffffa0341caa>] nfsd4_encode_getattr+0x5a/0x60 [nfsd]
[ 1610.168320]  [<ffffffffa0341e07>] nfsd4_encode_operation+0x67/0x110
[nfsd]
[ 1610.168320]  [<ffffffffa033844d>] nfsd4_proc_compound+0x21d/0x810 [nfsd]
[ 1610.168320]  [<ffffffffa0324d9b>] nfsd_dispatch+0xbb/0x200 [nfsd]
[ 1610.168320]  [<ffffffffa00850cd>] svc_process_common+0x46d/0x6d0 [sunrpc]
[ 1610.168320]  [<ffffffffa0085433>] svc_process+0x103/0x170 [sunrpc]
[ 1610.168320]  [<ffffffffa032472f>] nfsd+0xbf/0x130 [nfsd]
[ 1610.168320]  [<ffffffffa0324670>] ? nfsd_destroy+0x80/0x80 [nfsd]
[ 1610.168320]  [<ffffffff810a5202>] kthread+0xd2/0xf0
[ 1610.168320]  [<ffffffff810a5130>] ? insert_kthread_work+0x40/0x40
[ 1610.168320]  [<ffffffff816c1ebc>] ret_from_fork+0x7c/0xb0
[ 1610.168320]  [<ffffffff810a5130>] ? insert_kthread_work+0x40/0x40
[ 1610.168320] Code: 78 02 e9 e7 fc ff ff 31 c0 31 d2 31 c9 66 89 45 ce
41 8b 04 24 66 89 55 d0 66 89 4d d2 48 8d 04 80 49 8d 5c 84 04 e9 37 fd
ff ff <0f> 0b 90 0f 1f 44 00 00 55 8b 56 08 c7 07 00 00 00 00 8b 46 0c
[ 1610.168320] RIP  [<ffffffffa034d5ed>] _posix_to_nfsv4_one+0x3cd/0x3d0
[nfsd]
[ 1610.168320]  RSP <ffff88005a945b00>
[ 1610.257313] ---[ end trace 838254e3e352285b ]---
Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Move the state locking and file descriptor reference out from the
callers and into nfs4_preprocess_stateid_op() itself.
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

They do not need to be used outside fs/nfsd/nfs4state.c
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

There is almost nothing left it in, just merge it into the only file
that includes it.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

There are no legitimate users outside of fs/nfsd, so move it there.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

There are no legitimate users outside of fs/nfsd, so move it there.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

The only real user of this header is fs/nfsd/nfsfh.h, so merge the
two.  Various lockѕ source files used it to indirectly get other
sunrpc or nfs headers, so fix those up.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

It is large, it is used in more than one place, and it is not performance
critical. Let gcc figure out whether it should be inlined...
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Mainly to ensure that we don't leave any hanging timers.
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Aside from making it clearer what is non-trivial in create_client(), it
also fixes a bug whereby we can call free_client() before idr_init()
has been called.
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Since we're still limiting attributes to a page, the result here is that
a large getattr result will return NFS4ERR_REP_TOO_BIG/TOO_BIG_TO_CACHE
instead of NFS4ERR_RESOURCE.

Both error returns are wrong, and the real bug here is the arbitrary
limit on getattr results, fixed by as-yet out-of-tree patches.  But at a
minimum we can make life easier for clients by sticking to one broken
behavior in released kernels instead of two....

Trond says:

	one immediate consequence of this patch will be that NFSv4.1
	clients will now report EIO instead of EREMOTEIO if they hit the
	problem. That may make debugging a little less obvious.

	Another consequence will be that if we ever do try to add client
	side handling of NFS4ERR_REP_TOO_BIG, then we now have to deal
	with the “handle existing buggy server” syndrome.
Reported-by: NTrond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

...otherwise the logic in the timeout handling doesn't work correctly.
Spotted-by: NTrond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org
Signed-off-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Any setattr of the ACL attribute, even if it sets just the basic 3-ACE
ACL exactly as it was returned from a file with only mode bits, creates
a mask entry, and it is only the mask, not group, entry that is changed
by subsequent modifications of the mode bits.

So, for example, it's surprising that GROUP@ is left without read or
write permissions after a chmod 0666:

  touch test
  chmod 0600 test
  nfs4_getfacl test
        A::OWNER@:rwatTcCy
        A::GROUP@:tcy
        A::EVERYONE@:tcy
  nfs4_getfacl test | nfs4_setfacl -S - test #
  chmod 0666 test
  nfs4_getfacl test
        A::OWNER@:rwatTcCy
        A::GROUP@:tcy
        D::GROUP@:rwa
        A::EVERYONE@:rwatcy

So, let's stop creating the unnecessary mask ACL.

A mask will still be created on non-trivial ACLs (ACLs with actual named
user and group ACEs), so the odd posix-acl behavior of chmod modifying
only the mask will still be left in that case; but that's consistent
with local behavior.
Reported-by: NSoumya Koduri <skoduri@redhat.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

This reverts the part of commit 6e14b46b
that changes NFSv2 behavior.

Mark Lord found that it broke nfs-root for Linux clients, because it
broke NFSv2.

In fact, from RFC 1094:

	"Notice that the file type is specified both in the mode bits
	and in the file type.  This is really a bug in the protocol and
	will be fixed in future versions."

So NFSv2 clients really are expected to depend on the high bits of the
mode.

Cc: stable@kernel.org
Reported-by: NMark Lord <mlord@pobox.com>
Reviewed-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

After commit 6307f8fe ("security: remove dead hook task_setgroups"),
set_groups will always return zero, so we could just remove return value
of set_groups.

This patch reduces code size, and simplfies code to use set_groups,
because we don't need to check its return value any more.

[akpm@linux-foundation.org: remove obsolete claims from set_groups() comment]
Signed-off-by: NWang YanQing <udknight@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Add new renameat2 syscall, which is the same as renameat with an added
flags argument.

Pass flags to vfs_rename() and to i_op->rename() as well.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
Reviewed-by: NJ. Bruce Fields <bfields@redhat.com>

fh_put() does not free the temporary file handle.
Signed-off-by: NYan, Zheng <zheng.z.yan@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

There could be a case, when NFSd file system is mounted in network, different
to socket's one, like below:

"ip netns exec" creates new network and mount namespace, which duplicates NFSd
mount point, created in init_net context. And thus NFS server stop in nested
network context leads to RPCBIND client destruction in init_net.
Then, on NFSd start in nested network context, rpc.nfsd process creates socket
in nested net and passes it into "write_ports", which leads to RPCBIND sockets
creation in init_net context because of the same reason (NFSd monut point was
created in init_net context). An attempt to register passed socket in nested
net leads to panic, because no RPCBIND client present in nexted network
namespace.

This patch add check that passed socket's net matches NFSd superblock's one.
And returns -EINVAL error to user psace otherwise.

v2: Put socket on exit.
Reported-by: NWeng Meiling <wengmeiling.weng@huawei.com>
Signed-off-by: NStanislav Kinsbursky <skinsbursky@parallels.com>
Cc: stable@vger.kernel.org
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Besides checking rpc_xprt out of xs_setup_bc_tcp,
increase it's reference (it's important).
Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Testing NFS4.0 by pynfs, I got some messeages as,
"nfsd: inode locked twice during operation."

When one compound RPC contains two or more ops that locks
the filehandle,the second op will cause the message.

As two SETATTR ops, after the first SETATTR, nfsd will not call
fh_put() to release current filehandle, it means filehandle have
unlocked with fh_post_saved = 1.
The second SETATTR find fh_post_saved = 1, and printk the message.

v2: introduce helper fh_clear_wcc().
Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

RFC5661 obsoletes NFS4ERR_STALE_STATEID in favour of NFS4ERR_BAD_STATEID.

Note that because nfsd encodes the clientid boot time in the stateid, we
can hit this error case in certain scenarios where the Linux client
state management thread exits early, before it has finished recovering
all state.
Reported-by: NIdan Kedar <idank@primarydata.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

encode_getattr, for example, can return nfserr_resource to indicate it
ran out of buffer space.  That's not a legal error in the 4.1 case.  And
in the 4.1 case, if we ran out of buffer space, we should have exceeded
a session limit too.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Cc: stable@vger.kernel.org
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

cstate->slot and ->session are each set together in nfsd4_sequence.  If
one is non-NULL, so is the other.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Maybe this is comment true, who cares?  Handle this like any other
error.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

This isn't actually used anywhere else.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Connection from alloc_conn must be freed through free_conn,
otherwise, the reference of svc_xprt will never be put.
Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

When stopping nfsd, I got BUG messages, and soft lockup messages,
The problem is cuased by double rb_erase() in nfs4_state_destroy_net()
and destroy_client().

This patch just let nfsd traversing unconfirmed client through
hash-table instead of rbtree.

[ 2325.021995] BUG: unable to handle kernel NULL pointer dereference at
          (null)
[ 2325.022809] IP: [<ffffffff8133c18c>] rb_erase+0x14c/0x390
[ 2325.022982] PGD 7a91b067 PUD 7a33d067 PMD 0
[ 2325.022982] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[ 2325.022982] Modules linked in: nfsd(OF) cfg80211 rfkill bridge stp
llc snd_intel8x0 snd_ac97_codec ac97_bus auth_rpcgss nfs_acl serio_raw
e1000 i2c_piix4 ppdev snd_pcm snd_timer lockd pcspkr joydev parport_pc
snd parport i2c_core soundcore microcode sunrpc ata_generic pata_acpi
[last unloaded: nfsd]
[ 2325.022982] CPU: 1 PID: 2123 Comm: nfsd Tainted: GF          O
3.14.0-rc8+ #2
[ 2325.022982] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[ 2325.022982] task: ffff88007b384800 ti: ffff8800797f6000 task.ti:
ffff8800797f6000
[ 2325.022982] RIP: 0010:[<ffffffff8133c18c>]  [<ffffffff8133c18c>]
rb_erase+0x14c/0x390
[ 2325.022982] RSP: 0018:ffff8800797f7d98  EFLAGS: 00010246
[ 2325.022982] RAX: ffff880079c1f010 RBX: ffff880079f4c828 RCX:
0000000000000000
[ 2325.022982] RDX: 0000000000000000 RSI: ffff880079bcb070 RDI:
ffff880079f4c810
[ 2325.022982] RBP: ffff8800797f7d98 R08: 0000000000000000 R09:
ffff88007964fc70
[ 2325.022982] R10: 0000000000000000 R11: 0000000000000400 R12:
ffff880079f4c800
[ 2325.022982] R13: ffff880079bcb000 R14: ffff8800797f7da8 R15:
ffff880079f4c860
[ 2325.022982] FS:  0000000000000000(0000) GS:ffff88007f900000(0000)
knlGS:0000000000000000
[ 2325.022982] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2325.022982] CR2: 0000000000000000 CR3: 000000007a3ef000 CR4:
00000000000006e0
[ 2325.022982] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 2325.022982] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[ 2325.022982] Stack:
[ 2325.022982]  ffff8800797f7de0 ffffffffa0191c6e ffff8800797f7da8
ffff8800797f7da8
[ 2325.022982]  ffff880079f4c810 ffff880079bcb000 ffffffff81cc26c0
ffff880079c1f010
[ 2325.022982]  ffff880079bcb070 ffff8800797f7e28 ffffffffa01977f2
ffff8800797f7df0
[ 2325.022982] Call Trace:
[ 2325.022982]  [<ffffffffa0191c6e>] destroy_client+0x32e/0x3b0 [nfsd]
[ 2325.022982]  [<ffffffffa01977f2>] nfs4_state_shutdown_net+0x1a2/0x220
[nfsd]
[ 2325.022982]  [<ffffffffa01700b8>] nfsd_shutdown_net+0x38/0x70 [nfsd]
[ 2325.022982]  [<ffffffffa017013e>] nfsd_last_thread+0x4e/0x80 [nfsd]
[ 2325.022982]  [<ffffffffa001f1eb>] svc_shutdown_net+0x2b/0x30 [sunrpc]
[ 2325.022982]  [<ffffffffa017064b>] nfsd_destroy+0x5b/0x80 [nfsd]
[ 2325.022982]  [<ffffffffa0170773>] nfsd+0x103/0x130 [nfsd]
[ 2325.022982]  [<ffffffffa0170670>] ? nfsd_destroy+0x80/0x80 [nfsd]
[ 2325.022982]  [<ffffffff810a8232>] kthread+0xd2/0xf0
[ 2325.022982]  [<ffffffff810a8160>] ? insert_kthread_work+0x40/0x40
[ 2325.022982]  [<ffffffff816c493c>] ret_from_fork+0x7c/0xb0
[ 2325.022982]  [<ffffffff810a8160>] ? insert_kthread_work+0x40/0x40
[ 2325.022982] Code: 48 83 e1 fc 48 89 10 0f 84 02 01 00 00 48 3b 41 10
0f 84 08 01 00 00 48 89 51 08 48 89 fa e9 74 ff ff ff 0f 1f 40 00 48 8b
50 10 <f6> 02 01 0f 84 93 00 00 00 48 8b 7a 10 48 85 ff 74 05 f6 07 01
[ 2325.022982] RIP  [<ffffffff8133c18c>] rb_erase+0x14c/0x390
[ 2325.022982]  RSP <ffff8800797f7d98>
[ 2325.022982] CR2: 0000000000000000
[ 2325.022982] ---[ end trace 28c27ed011655e57 ]---

[  228.064071] BUG: soft lockup - CPU#0 stuck for 22s! [nfsd:558]
[  228.064428] Modules linked in: ip6t_rpfilter ip6t_REJECT cfg80211
xt_conntrack rfkill ebtable_nat ebtable_broute bridge stp llc
ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6
nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw
ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security
iptable_raw nfsd(OF) auth_rpcgss nfs_acl lockd snd_intel8x0
snd_ac97_codec ac97_bus joydev snd_pcm snd_timer e1000 sunrpc snd ppdev
parport_pc serio_raw pcspkr i2c_piix4 microcode parport soundcore
i2c_core ata_generic pata_acpi
[  228.064539] CPU: 0 PID: 558 Comm: nfsd Tainted: GF          O
3.14.0-rc8+ #2
[  228.064539] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[  228.064539] task: ffff880076adec00 ti: ffff880074616000 task.ti:
ffff880074616000
[  228.064539] RIP: 0010:[<ffffffff8133ba17>]  [<ffffffff8133ba17>]
rb_next+0x27/0x50
[  228.064539] RSP: 0018:ffff880074617de0  EFLAGS: 00000282
[  228.064539] RAX: ffff880074478010 RBX: ffff88007446f860 RCX:
0000000000000014
[  228.064539] RDX: ffff880074478010 RSI: 0000000000000000 RDI:
ffff880074478010
[  228.064539] RBP: ffff880074617de0 R08: 0000000000000000 R09:
0000000000000012
[  228.064539] R10: 0000000000000001 R11: ffffffffffffffec R12:
ffffea0001d11a00
[  228.064539] R13: ffff88007f401400 R14: ffff88007446f800 R15:
ffff880074617d50
[  228.064539] FS:  0000000000000000(0000) GS:ffff88007f800000(0000)
knlGS:0000000000000000
[  228.064539] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  228.064539] CR2: 00007fe9ac6ec000 CR3: 000000007a5d6000 CR4:
00000000000006f0
[  228.064539] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[  228.064539] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[  228.064539] Stack:
[  228.064539]  ffff880074617e28 ffffffffa01ab7db ffff880074617df0
ffff880074617df0
[  228.064539]  ffff880079273000 ffffffff81cc26c0 ffffffff81cc26c0
0000000000000000
[  228.064539]  0000000000000000 ffff880074617e48 ffffffffa01840b8
ffffffff81cc26c0
[  228.064539] Call Trace:
[  228.064539]  [<ffffffffa01ab7db>] nfs4_state_shutdown_net+0x18b/0x220
[nfsd]
[  228.064539]  [<ffffffffa01840b8>] nfsd_shutdown_net+0x38/0x70 [nfsd]
[  228.064539]  [<ffffffffa018413e>] nfsd_last_thread+0x4e/0x80 [nfsd]
[  228.064539]  [<ffffffffa00aa1eb>] svc_shutdown_net+0x2b/0x30 [sunrpc]
[  228.064539]  [<ffffffffa018464b>] nfsd_destroy+0x5b/0x80 [nfsd]
[  228.064539]  [<ffffffffa0184773>] nfsd+0x103/0x130 [nfsd]
[  228.064539]  [<ffffffffa0184670>] ? nfsd_destroy+0x80/0x80 [nfsd]
[  228.064539]  [<ffffffff810a8232>] kthread+0xd2/0xf0
[  228.064539]  [<ffffffff810a8160>] ? insert_kthread_work+0x40/0x40
[  228.064539]  [<ffffffff816c493c>] ret_from_fork+0x7c/0xb0
[  228.064539]  [<ffffffff810a8160>] ? insert_kthread_work+0x40/0x40
[  228.064539] Code: 1f 44 00 00 55 48 8b 17 48 89 e5 48 39 d7 74 3b 48
8b 47 08 48 85 c0 75 0e eb 25 66 0f 1f 84 00 00 00 00 00 48 89 d0 48 8b
50 10 <48> 85 d2 75 f4 5d c3 66 90 48 3b 78 08 75 f6 48 8b 10 48 89 c7

Fixes: ac55fdc4 (nfsd: move the confirmed and unconfirmed hlists...)
Signed-off-by: NKinglong Mee <kinglongmee@gmail.com>
Cc: stable@vger.kernel.org
Reviewed-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

We have a WARN_ON in the nfsd4_decode_write() that tells us when the
client has sent a request that is not padded out properly according to
RFC4506. A WARN_ON really isn't appropriate in this case though since
this indicates a client bug, not a server one.

Move this check out to the top-level compound decoder and have it just
explicitly return an error. Also add a dprintk() that shows the client
address and xid to help track down clients and frames that trigger it.
Signed-off-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

Looks like this bug has been here since these write counts were
introduced, not sure why it was just noticed now.

Thanks also to Jan Kara for pointing out the problem.

Cc: stable@vger.kernel.org
Reported-by: NMatthew Rahtz <mrahtz@rapitasystems.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

If the entire operation fails then there's nothing to encode.

Cc: stable@vger.kernel.org
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

This fixes an ommission from 18032ca0
"NFSD: Server implementation of MAC Labeling", which increased the size
of the setattr error reply without increasing COMPOUND_ERR_SLACK_SPACE.

Cc: stable@vger.kernel.org
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>