Introduce an xdr_stream-based XDR decoder that can unpack the auth-
flavor list returned in a MNT3 reply.

The nfs_mount() function's caller allocates an array, and passes the
size and a pointer to it.  The decoder decodes all the flavors it can
into the array, and returns the number of decoded flavors.

If the caller is not interested in the auth flavors, it can pass a
value of zero as the size of the pre-allocated array.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Introduce xdr_stream-based XDR file handle decoders to the in-kernel
mountd client.  These are more careful than the existing decoder
functions about buffer overflows and data type and range checking.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Introduce data structures and xdr_stream-based decoding functions for
unmarshalling mountd status codes properly.

Mountd version 3 uses specific standard error return codes that are
not errno values and not NFS3ERR_ values.  These have a well-defined
standard mapping to local errno values.  Introduce data structures
and a decoder function that map these status codes to local errno
values properly.  This is new functionality (but not used yet).

Version 1 mountd status values are defined by RFC 1094 as UNIX error
values (errno values).  Errno values on heterogeneous systems do not
necessarily match each other.  To avoid exposing possibly incorrect
errno values to upper layers, the current XDR decoder converts all
non-zero MNT version 1 status codes to -EACCES.

The OpenGroup XNFS standard provides a mapping similar to but smaller
than the version 3 error codes.  Implement a decoder that uses the XNFS
error codes, replacing the current decoder.

For both mountd protocol versions, map unrecognized errors to -EACCES.

Finally we introduce a replacement data structure for mnt_fhstatus
at this time, which is used by the new XDR decoders.  In addition to
documenting that the status value returned by the XDR decoders is
always an errno, this new structure will be expanded in subsequent
patches.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Clean up: remove xdr_encode_dirpath() now that it has been replaced.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Check the length of the supplied dirpath, and see that it fits
properly in the RPC buffer.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Clean up:  Relocate MNT program procedure number definitions to the
only file that uses them.  Relocate the version number definitions,
which are shared, to nfs.h.  Remove duplicate program number
definitions.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Cut NSM upcall RPC traffic in half -- don't do a NULL call first.
The cases where a ping would be helpful are rare.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

When rpc.statd starts up in user space at boot time, it attempts to
write the latest NSM local state number into
/proc/sys/fs/nfs/nsm_local_state.

If lockd.ko isn't loaded yet (as is the case in most configurations),
that file doesn't exist, thus the kernel's NSM state remains set to
its initial value of zero during lockd operation.

This is a problem because rpc.statd and lockd use the NSM state number
to prevent repeated lock recovery on rebooted hosts.  If lockd sends
a zero NSM state, but then a delayed SM_NOTIFY with a real NSM state
number is received, there is no way for lockd or rpc.statd to
distinguish that stale SM_NOTIFY from an actual reboot.  Thus lock
recovery could be performed after the rebooted host has already
started reclaiming locks, and those locks will be lost.

We could change /etc/init.d/nfslock so it always modprobes lockd.ko
before starting rpc.statd.  However, if lockd.ko is ever unloaded
and reloaded, we are back at square one, since the NSM state is not
preserved across an unload/reload cycle.  This may happen frequently
on clients that use automounter.  A period of NFS inactivity causes
lockd.ko to be unloaded, and the kernel loses its NSM state setting.

Instead, let's use the fact that rpc.statd plants the local system's
NSM state in every SM_MON (and SM_UNMON) reply.  lockd performs a
synchronous SM_MON upcall to the local rpc.statd _before_ sending its
first NLM request to a new remote.  This would permit rpc.statd to
provide the current NSM state to lockd, even after lockd.ko had been
unloaded and reloaded.

Note that NLMPROC_LOCK arguments are constructed before the
nsm_monitor() call, so we have to rearrange argument construction very
slightly to make this all work out.

And, the kernel appears to treat NSM state as a u32 (see struct
nlm_args and nsm_res).  Make nsm_local_state a u32 as well, to ensure
we don't get bogus comparison results.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Clear "ret" if the error return from svc_create_xprt(AF_INET6) was
-EAFNOSUPORT.  Otherwise, callback start-up will succeed, but
nfs_callback_up() will return -EAFNOSUPPORT anyway, and the first
NFSv4 mount attempt after a reboot will fail.

Bug introduced by commit f738f517 in 2.6.30-rc1.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

If the kernel cannot start the NFSv4 callback service during a mount
request, it returns -ENOMEM to user space, resulting in this message:

   mount.nfs4: Cannot allocate memory

Adjust nfs_alloc_client() and nfs_get_client() to pass NFSv4 callback
start-up errors back to user space so a less mysterious error message
can be displayed by the mount command.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

The "intr" mount option has been deprecated for a while, but
/proc/mounts continues to display "nointr" whether "intr" or "nointr"
has been specified for a mount point.

Since these options do not have any effect, simply do not display
them.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Adds support for splice writes. It effectively calls
generic_file_splice_write() to do the writes.

We need not worry about O_APPEND case as the combination of splice()
writes and O_APPEND is disallowed. This patch propagates NFS write
errors back to the caller. The number of bytes written via splice are
being added to NFSIO_NORMALWRITTENBYTES as these are effectively
cached writes.
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

It is possible for servers to return NFS4ERR_BAD_STATEID when
the state management code is recovering locks or is reclaiming state when
returning a delegation. Ensure that we handle that case.
While we're at it, add in handlers for NFS4ERR_STALE,
NFS4ERR_ADMIN_REVOKED, NFS4ERR_OPENMODE, NFS4ERR_DENIED and
NFS4ERR_STALE_STATEID, since the protocol appears to allow for them too.

Also handle ENOMEM...

Finally, rather than add new NFSv4.0-specific errors and error handling into
the generic delegation code, move that open file and locking state error
handling into the NFSv4 layer.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

The NFSv4 delegation recovery code is required by the protocol to handle
more errors. Rather than add NFSv4.0 specific errors into 'generic'
delegation code, we should move the error handling into the NFSv4 layer.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

NFSv4 should just ignore the 'nolock' option. It is an NFSv2/v3 thing...
This fixes the Oops in http://bugzilla.kernel.org/show_bug.cgi?id=13330Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

In the case of -EADDRNOTAVAIL and/or unhandled connection errors, we want
to get rid of the existing socket and retry immediately, just as the
comment says. Currently we end up sleeping for a minute, due to the missing
"break" statement.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

* 'kmemleak' of git://linux-arm.org/linux-2.6:
  kmemleak: Fix some typos in comments
  kmemleak: Rename kmemleak_panic to kmemleak_stop
  kmemleak: Only use GFP_KERNEL|GFP_ATOMIC for the internal allocations

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

This is to avoid the confusion created by the "panic" word.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>

Kmemleak allocates memory for pointer tracking and it tries to avoid
using GFP_ATOMIC if the caller doesn't require it. However other gfp
flags may be passed by the caller which aren't required by kmemleak.
This patch filters the gfp flags so that only GFP_KERNEL | GFP_ATOMIC
are used.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
  [CPUFREQ] cpumask: new cpumask operators for arch/x86/kernel/cpu/cpufreq/powernow-k8.c
  [CPUFREQ] cpumask: avoid playing with cpus_allowed in powernow-k8.c
  [CPUFREQ] cpumask: avoid cpumask games in arch/x86/kernel/cpu/cpufreq/speedstep-centrino.c
  [CPUFREQ] cpumask: avoid playing with cpus_allowed in speedstep-ich.c
  [CPUFREQ] powernow-k8: get drv data for correct CPU
  [CPUFREQ] powernow-k8: read P-state from HW
  [CPUFREQ] reduce scope of ACPI_PSS_BIOS_BUG_MSG[]
  [CPUFREQ] Clean up convoluted code in arch/x86/kernel/tsc.c:time_cpufreq_notifier()
  [CPUFREQ] minor correction to cpu-freq documentation
  [CPUFREQ] powernow-k8.c: mess cleanup
  [CPUFREQ] Only set sampling_rate_max deprecated, sampling_rate_min is useful
  [CPUFREQ] powernow-k8: Set transition latency to 1 if ACPI tables export 0
  [CPUFREQ] ondemand: Uncouple minimal sampling rate from HZ in NO_HZ case

* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6:
  [SCSI] aic79xx: make driver respect nvram for IU and QAS settings
  [SCSI] don't attach ULD to Dell Universal Xport
  [SCSI] lpfc 8.3.3 : Update driver version to 8.3.3
  [SCSI] lpfc 8.3.3 : Add support for Target Reset handler entrypoint
  [SCSI] lpfc 8.3.3 : Fix a couple of spin_lock and memory issues and a crash
  [SCSI] lpfc 8.3.3 : FC/FCOE discovery fixes
  [SCSI] lpfc 8.3.3 : Fix various SLI-3 vs SLI-4 differences
  [SCSI] qla2xxx: Resolve a performance issue in interrupt
  [SCSI] cnic, bnx2i: Fix build failure when CONFIG_PCI is not set.
  [SCSI] nsp_cs: time_out reaches -1
  [SCSI] qla2xxx: fix printk format warnings
  [SCSI] ncr53c8xx: div reaches -1
  [SCSI] compat: don't perform unneeded copy in sg_io code
  [SCSI] zfcp: Update FC pass-through support
  [SCSI] zfcp: Add FC pass-through support
  [SCSI] FC Pass Thru support

* 'linux-next' of git://git.infradead.org/ubi-2.6: (21 commits)
  UBI: add reboot notifier
  UBI: handle more error codes
  UBI: fix multiple spelling typos
  UBI: fix kmem_cache_free on error patch
  UBI: print amount of reserved PEBs
  UBI: improve messages in the WL worker
  UBI: make gluebi a separate module
  UBI: remove built-in gluebi
  UBI: add notification API
  UBI: do not switch to R/O mode on read errors
  UBI: fix and clean-up error paths in WL worker
  UBI: introduce new constants
  UBI: fix race condition
  UBI: minor serialization fix
  UBI: do not panic if volume check fails
  UBI: add dump_stack in checking code
  UBI: fix races in I/O debugging checks
  UBI: small debugging code optimization
  UBI: improve debugging messages
  UBI: re-name volumes_mutex to device_mutex
  ...

* 'linux-next' of git://git.infradead.org/ubifs-2.6:
  UBIFS: start using hrtimers
  hrtimer: export ktime_add_safe
  UBIFS: do not forget to register BDI device
  UBIFS: allow sync option in rootflags
  UBIFS: remove dead code
  UBIFS: use anonymous device
  UBIFS: return proper error code if the compr is not present
  UBIFS: return error if link and unlink race
  UBIFS: reset no_space flag after inode deletion

For it is only in linux-next at this stage.

Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This causes an issue since we fixed the drm mappings to do the right thing,
so its just a copy and pasto.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6:
  SLUB: Fix early boot GFP_DMA allocations
  SLUB: Don't print out OOM warning for __GFP_NOFAIL
  SLUB: fix build when !SLUB_DEBUG
  SLUB: Out-of-memory diagnostics
  slab: document kzfree() zeroing behavior
  slab: fix generic PAGE_POISONING conflict with SLAB_RED_ZONE
  slob: use PG_slab for identifying SLOB pages

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: (47 commits)
  MIPS: Add hibernation support
  MIPS: Move Cavium CP0 hwrena impl bits to cpu-feature-overrides.h
  MIPS: Allow CPU specific overriding of CP0 hwrena impl bits.
  MIPS: Kconfig Add SYS_SUPPORTS_HUGETLBFS and enable it for some systems.
  Hugetlbfs: Enable hugetlbfs for more systems in Kconfig.
  MIPS: TLB support for hugetlbfs.
  MIPS: Add hugetlbfs page defines.
  MIPS: Add support files for hugetlbfs.
  MIPS: Remove unused parameters from iPTE_LW.
  Staging: Add octeon-ethernet driver files.
  MIPS: Export erratum function needed by octeon-ethernet driver.
  MIPS: Cavium-Octeon: Add more chip specific feature tests.
  MIPS: Cavium-Octeon: Add more board type constants.
  MIPS: Export cvmx_sysinfo_get needed by octeon-ethernet driver.
  MIPS: Add named alloc functions to OCTEON boot monitor memory allocator.
  MIPS: Alchemy: devboards: Convert to gpio calls.
  MIPS: Alchemy: xxs1500: use linux gpio api.
  MIPS: Alchemy: MTX-1: Use linux gpio api.
  MIPS: Alchemy: Rewrite GPIO support.
  MIPS: Alchemy: Remove unused au1000_gpio.h header
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
  get rid of BKL in fs/sysv
  get rid of BKL in fs/minix
  get rid of BKL in fs/efs
  befs ->pust_super() doesn't need BKL
  Cleanup of adfs headers
  9P doesn't need BKL in ->umount_begin()
  fuse doesn't need BKL in ->umount_begin()
  No instance of ->bmap() needs BKL
  remove unlock_kernel() left accidentally
  ext4: avoid unnecessary spinlock in critical POSIX ACL path
  ext3: avoid unnecessary spinlock in critical POSIX ACL path

[Ralf: SMP support requires CPU hotplugging which MIPS currently doesn't
support.  As implemented in this patch cache and tlb flushing will also be
invoked with interrupts disabled so smp_call_function() will blow up in
charming ways.  So limit to !SMP.]
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Yan Hua <yanh@lemote.com>
Reviewed-by: Arnaud Patard <apatard@mandriva.com>
Reviewed-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Wu Zhangjin <wuzj@lemote.com>
Signed-off-by: Hu Hongbing <huhb@lemote.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

We had an ugly #ifdef for Cavium Octeon hwrena bits in traps.c, remove
it to mach-cavium-octeon/cpu-feature-overrides.h
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Some CPUs have implementation dependent rdhwr registers.  Allow them
to be enabled on a per CPU basis.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Add new kconfig variables SYS_SUPPORTS_HUGETLBFS and
CPU_SUPPORTS_HUGEPAGES.  They are enabled for systems that are known
to support huge pages.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

As part of adding hugetlbfs support for MIPS, I am adding a new
kconfig variable 'SYS_SUPPORTS_HUGETLBFS'.  Since some mips cpu
varients don't yet support it, we can enable selection of HUGETLBFS on
a system by system basis from the arch/mips/Kconfig.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
CC: William Irwin <wli@holomorphy.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The TLB handlers need to check for huge pages and give them special
handling.  Huge pages consist of two contiguous sub-pages of physical
memory.

* Loading entrylo0 and entrylo1 need to be handled specially.

* The page mask must be set for huge pages and then restored after
  writing the TLB entries.

* The PTE for huge pages resides in the PMD, we halt traversal of the
  tables there.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The l parameter to iPTE_LW() is unused. Remove it and from some of its
callers as well.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>