This adds a force close option, so we can force the unmapping
of a rbd device that is open. If a path/device is blacklisted, apps
like multipathd can map a new device and then unmap the old one.
The unmapping cleanup would then be handled by the generic hotunplug
code paths in multipahd like is done for iSCSI, FC/FCOE, SAS, etc.
Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Export the info used to setup the rbd image, so it can be used to remap
the image.
Signed-off-by: Mike Christie <mchristi@redhat.com>
[idryomov@gmail.com: do_rbd_add() EH]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Export snap id in sysfs, so tools like multipathd can use it in a uuid.
Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Export the cluster fsid, so tools like udev and multipath-tools can use
it for part of the uuid.
Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Export client addr/nonce, so userspace can check if a image is being
blacklisted.
Signed-off-by: Mike Christie <mchristi@redhat.com>
[idryomov@gmail.com: ceph_client_addr(), endianess fix]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

With exclusive-lock added and more to come, print features into dmesg.
Change capacity to decimal while at it.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>

Add basic support for RBD_FEATURE_EXCLUSIVE_LOCK feature.  Maintenance
operations (resize, snapshot create, etc) are offloaded to librbd via
returning -EOPNOTSUPP - librbd should request the lock and execute the
operation.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Tested-by: Mike Christie <mchristi@redhat.com>

Revamp watch code to support retrying watch re-registration:

- add rbd_dev->watch_state for more robust errcb handling
- store watch cookie separately to avoid dereferencing watch_handle
  which is set to NULL on unwatch
- move re-register code into a delayed work and retry re-registration
  every second, unless the client is blacklisted
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Tested-by: Mike Christie <mchristi@redhat.com>

This is going to be used for re-registering watch requests and
exclusive-lock tasks: acquire/request lock, notify-acquired, release
lock, notify-released.  Some refactoring in the map/unmap paths was
necessary to give this workqueue a meaningful name: "rbdX-tasks".
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>

It's gid / global_id in other places.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>

Reuse ceph_mon_generic_request infrastructure for sending monitor
commands.  In particular, add support for 'blacklist add' to prevent
other, non-responsive clients from making further updates.
Signed-off-by: Douglas Fuller <dfuller@redhat.com>
[idryomov@gmail.com: refactor, misc fixes throughout]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>

Add an interface for the Ceph OSD lock.lock_info method and associated
data structures.

Based heavily on code by Mike Christie <michaelc@cs.wisc.edu>.
Signed-off-by: Douglas Fuller <dfuller@redhat.com>
[idryomov@gmail.com: refactor, misc fixes throughout]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>

This patch adds support for rados lock, unlock and break lock.

Based heavily on code by Mike Christie <michaelc@cs.wisc.edu>.
Signed-off-by: Douglas Fuller <dfuller@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>

Add a convenience function to osd_client to send Ceph OSD
'class' ops. The interface assumes that the request and
reply data each consist of single pages.
Signed-off-by: Douglas Fuller <dfuller@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>

Add support for this Ceph OSD op, needed to support the RBD exclusive
lock feature.
Signed-off-by: Douglas Fuller <dfuller@redhat.com>
[idryomov@gmail.com: refactor, misc fixes throughout]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>

Clear up EntityName vs entity_name_t confusion.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>

Pull thermal updates from Zhang Rui:

 - Fix a race condition when updating cooling device, which may lead to
   a situation where a thermal governor never updates the cooling
   device.  From Michele Di Giorgio.

 - Fix a zero division error when disabling the forced idle injection
   from the intel powerclamp.  From Petr Mladek.

 - Add suspend/resume callback for intel_pch_thermal thermal driver.
   From Srinivas Pandruvada.

 - Another two fixes for clocking cooling driver and hwmon sysfs I/F.
   From Michele Di Giorgio and Kuninori Morimoto.

[ Hmm.  That suspend/resume callback for intel_pch_thermal doesn't look
  like a fix, but I'm letting it slide..  - Linus ]

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux:
  thermal: clock_cooling: Fix missing mutex_init()
  thermal: hwmon: EXPORT_SYMBOL_GPL for thermal hwmon sysfs
  thermal: fix race condition when updating cooling device
  thermal/powerclamp: Prevent division by zero when counting interval
  thermal: intel_pch_thermal: Add suspend/resume callback

Pull m68knommu fix from Greg Ungerer:
 "This contains only a single fix for a register corruption problem on
  certain types of m68k flat format binaries"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu:
  m68knommu: fix user a5 register being overwritten

Merge tag 'fixes-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull h8300 and unicore32 architecture fixes from Guenter Roeck:
 "Two patches to fix h8300 and unicore32 builds.

  unicore32 builds have been broken since v4.6.  The fix has been
  available in -next since March of this year.

  h8300 builds have been broken since the last commit window.  The fix
  has been available in -next since June of this year"

* tag 'fixes-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  h8300: Add missing include file to asm/io.h
  unicore32: mm: Add missing parameter to arch_vma_access_permitted

Pull arm64 fixes from Catalin Marinas:

 - support for nr_cpus= command line argument (maxcpus was previously
   changed to allow secondary CPUs to be hot-plugged)

 - ARM PMU interrupt handling fix

 - fix potential TLB conflict in the hibernate code

 - improved handling of EL1 instruction aborts (better error reporting)

 - removal of useless jprobes code for stack saving/restoring

 - defconfig updates

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: defconfig: enable CONFIG_LOCALVERSION_AUTO
  arm64: defconfig: add options for virtualization and containers
  arm64: hibernate: handle allocation failures
  arm64: hibernate: avoid potential TLB conflict
  arm64: Handle el1 synchronous instruction aborts cleanly
  arm64: Remove stack duplicating code from jprobes
  drivers/perf: arm-pmu: Fix handling of SPI lacking "interrupt-affinity" property
  drivers/perf: arm-pmu: convert arm_pmu_mutex to spinlock
  arm64: Support hard limit of cpu count by nr_cpus

Pull KVM fixes from Radim Krčmář:
 "KVM:
   - lock kvm_device list to prevent corruption on device creation.

  PPC:
   - split debugfs initialization from creation of the xics device to
     unlock the newly taken kvm lock earlier.

  s390:
   - prevent userspace from triggering two WARN_ON_ONCE.

  MIPS:
   - fix several issues in the management of TLB faults (Cc: stable)"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  MIPS: KVM: Propagate kseg0/mapped tlb fault errors
  MIPS: KVM: Fix gfn range check in kseg0 tlb faults
  MIPS: KVM: Add missing gfn range check
  MIPS: KVM: Fix mapped fault broken commpage handling
  KVM: Protect device ops->create and list_add with kvm->lock
  KVM: PPC: Move xics_debugfs_init out of create
  KVM: s390: reset KVM_REQ_MMU_RELOAD if mapping the prefix failed
  KVM: s390: set the prefix initially properly

Pull block fixes from Jens Axboe:

 - an NVMe fix from Gabriel, fixing a suspend/resume issue on some
   setups

 - addition of a few missing entries in the block queue sysfs
   documentation, from Joe

 - a fix for a sparse shadow warning for the bvec iterator, from
   Johannes

 - a writeback deadlock involving raid issuing barriers, and not
   flushing the plug when we wakeup the flusher threads.  From
   Konstantin

 - a set of patches for the NVMe target/loop/rdma code, from Roland and
   Sagi

* 'for-linus' of git://git.kernel.dk/linux-block:
  bvec: avoid variable shadowing warning
  doc: update block/queue-sysfs.txt entries
  nvme: Suspend all queues before deletion
  mm, writeback: flush plugged IO in wakeup_flusher_threads()
  nvme-rdma: Remove unused includes
  nvme-rdma: start async event handler after reconnecting to a controller
  nvmet: Fix controller serial number inconsistency
  nvmet-rdma: Don't use the inline buffer in order to avoid allocation for small reads
  nvmet-rdma: Correctly handle RDMA device hot removal
  nvme-rdma: Make sure to shutdown the controller if we can
  nvme-loop: Remove duplicate call to nvme_remove_namespaces
  nvme-rdma: Free the I/O tags when we delete the controller
  nvme-rdma: Remove duplicate call to nvme_remove_namespaces
  nvme-rdma: Fix device removal handling
  nvme-rdma: Queue ns scanning after a sucessful reconnection
  nvme-rdma: Don't leak uninitialized memory in connect request private data

h8300 builds fail with

arch/h8300/include/asm/io.h:9:15: error: unknown type name ‘u8’
arch/h8300/include/asm/io.h:15:15: error: unknown type name ‘u16’
arch/h8300/include/asm/io.h:21:15: error: unknown type name ‘u32’

and many related errors.

Fixes: 23c82d41bdf4 ("kexec-allow-architectures-to-override-boot-mapping-fix")
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

unicore32 fails to compile with the following errors.

mm/memory.c: In function ‘__handle_mm_fault’:
mm/memory.c:3381: error:
	too many arguments to function ‘arch_vma_access_permitted’
mm/gup.c: In function ‘check_vma_flags’:
mm/gup.c:456: error:
	too many arguments to function ‘arch_vma_access_permitted’
mm/gup.c: In function ‘vma_permits_fault’:
mm/gup.c:640: error:
	too many arguments to function ‘arch_vma_access_permitted’

Fixes: d61172b4 ("mm/core, x86/mm/pkeys: Differentiate instruction fetches")
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>

Pull VFIO fix from Alex Williamson:
 "Fix oops when dereferencing empty data (Alex Williamson)"

* tag 'vfio-v4.8-rc2' of git://github.com/awilliam/linux-vfio:
  vfio/pci: Fix NULL pointer oops in error interrupt setup handling

Pull nfsd fixes from Bruce Fields:
 "Fixes for the dentry refcounting leak I introduced in 4.8-rc1, and for
  races in the LOCK code which appear to go back to the big nfsd state
  lock removal from 3.17"

* tag 'nfsd-4.8-1' of git://linux-nfs.org/~bfields/linux:
  nfsd: don't return an unhashed lock stateid after taking mutex
  nfsd: Fix race between FREE_STATEID and LOCK
  nfsd: fix dentry refcounting on create

Pull power management fixes from Rafael Wysocki:
 "Two hibernation fixes allowing it to work with the recently added
  randomization of the kernel identity mapping base on x86-64 and one
  cpufreq driver regression fix.

  Specifics:

   - Fix the x86 identity mapping creation helpers to avoid the
     assumption that the base address of the mapping will always be
     aligned at the PGD level, as it may be aligned at the PUD level if
     address space randomization is enabled (Rafael Wysocki).

   - Fix the hibernation core to avoid executing tracing functions
     before restoring the processor state completely during resume
     (Thomas Garnier).

   - Fix a recently introduced regression in the powernv cpufreq driver
     that causes it to crash due to an out-of-bounds array access
     (Akshay Adiga)"

* tag 'pm-4.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / hibernate: Restore processor state before using per-CPU variables
  x86/power/64: Always create temporary identity mapping correctly
  cpufreq: powernv: Fix crash in gpstate_timer_handler()

Pull x86 fixes from Ingo Molnar:
 "This is bigger than usual - the reason is partly a pent-up stream of
  fixes after the merge window and partly accidental.  The fixes are:

   - five patches to fix a boot failure on Andy Lutomirsky's laptop
   - four SGI UV platform fixes
   - KASAN fix
   - warning fix
   - documentation update
   - swap entry definition fix
   - pkeys fix
   - irq stats fix"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/apic/x2apic, smp/hotplug: Don't use before alloc in x2apic_cluster_probe()
  x86/efi: Allocate a trampoline if needed in efi_free_boot_services()
  x86/boot: Rework reserve_real_mode() to allow multiple tries
  x86/boot: Defer setup_real_mode() to early_initcall time
  x86/boot: Synchronize trampoline_cr4_features and mmu_cr4_features directly
  x86/boot: Run reserve_bios_regions() after we initialize the memory map
  x86/irq: Do not substract irq_tlb_count from irq_call_count
  x86/mm: Fix swap entry comment and macro
  x86/mm/kaslr: Fix -Wformat-security warning
  x86/mm/pkeys: Fix compact mode by removing protection keys' XSAVE buffer manipulation
  x86/build: Reduce the W=1 warnings noise when compiling x86 syscall tables
  x86/platform/UV: Fix kernel panic running RHEL kdump kernel on UV systems
  x86/platform/UV: Fix problem with UV4 BIOS providing incorrect PXM values
  x86/platform/UV: Fix bug with iounmap() of the UV4 EFI System Table causing a crash
  x86/platform/UV: Fix problem with UV4 Socket IDs not being contiguous
  x86/entry: Clarify the RF saving/restoring situation with SYSCALL/SYSRET
  x86/mm: Disable preemption during CR3 read+write
  x86/mm/KASLR: Increase BRK pages for KASLR memory randomization
  x86/mm/KASLR: Fix physical memory calculation on KASLR memory randomization
  x86, kasan, ftrace: Put APIC interrupt handlers into .irqentry.text

Pull timer fixes from Ingo Molnar:
 "Misc fixes: a /dev/rtc regression fix, two APIC timer period
  calibration fixes, an ARM clocksource driver fix and a NOHZ
  power use regression fix"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/hpet: Fix /dev/rtc breakage caused by RTC cleanup
  x86/timers/apic: Inform TSC deadline clockevent device about recalibration
  x86/timers/apic: Fix imprecise timer interrupts by eliminating TSC clockevents frequency roundoff error
  timers: Fix get_next_timer_interrupt() computation
  clocksource/arm_arch_timer: Force per-CPU interrupt to be level-triggered

* pm-sleep:
  PM / hibernate: Restore processor state before using per-CPU variables
  x86/power/64: Always create temporary identity mapping correctly

* pm-cpufreq:
  cpufreq: powernv: Fix crash in gpstate_timer_handler()

Pull scheduler fixes from Ingo Molnar:
 "Misc fixes: cputime fixes, two deadline scheduler fixes and a cgroups
  scheduling fix"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/cputime: Fix omitted ticks passed in parameter
  sched/cputime: Fix steal time accounting
  sched/deadline: Fix lock pinning warning during CPU hotplug
  sched/cputime: Mitigate performance regression in times()/clock_gettime()
  sched/fair: Fix typo in sync_throttle()
  sched/deadline: Fix wrap-around in DL heap

Restore the processor state before calling any other functions to
ensure per-CPU variables can be used with KASLR memory randomization.

Tracing functions use per-CPU variables (GS based on x86) and one was
called just before restoring the processor state fully. It resulted
in a double fault when both the tracing & the exception handler
functions tried to use a per-CPU variable.

Fixes: bb3632c6 (PM / sleep: trace events for suspend/resume)
Reported-and-tested-by: Borislav Petkov <bp@suse.de>
Reported-by: Jiri Kosina <jikos@kernel.org>
Tested-by: Rafael J. Wysocki <rafael@kernel.org>
Tested-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Thomas Garnier <thgarnie@google.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Pull perf fixes from Ingo Molnar:
 "Mostly tooling fixes, plus two uncore-PMU fixes, an uprobes fix, a
  perf-cgroups fix and an AUX events fix"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel/uncore: Add enable_box for client MSR uncore
  perf/x86/intel/uncore: Fix uncore num_counters
  uprobes/x86: Fix RIP-relative handling of EVEX-encoded instructions
  perf/core: Set cgroup in CPU contexts for new cgroup events
  perf/core: Fix sideband list-iteration vs. event ordering NULL pointer deference crash
  perf probe ppc64le: Fix probe location when using DWARF
  perf probe: Add function to post process kernel trace events
  tools: Sync cpufeatures headers with the kernel
  toops: Sync tools/include/uapi/linux/bpf.h with the kernel
  tools: Sync cpufeatures.h and vmx.h with the kernel
  perf probe: Support signedness casting
  perf stat: Avoid skew when reading events
  perf probe: Fix module name matching
  perf probe: Adjust map->reloc offset when finding kernel symbol from map
  perf hists: Trim libtraceevent trace_seq buffers
  perf script: Add 'bpf-output' field to usage message

nfsd4_lock will take the st_mutex before working with the stateid it
gets, but between the time when we drop the cl_lock and take the mutex,
the stateid could become unhashed (a'la FREE_STATEID). If that happens
the lock stateid returned to the client will be forgotten.

Fix this by first moving the st_mutex acquisition into
lookup_or_create_lock_state. Then, have it check to see if the lock
stateid is still hashed after taking the mutex. If it's not, then put
the stateid and try the find/create again.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Tested-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Cc: stable@vger.kernel.org # feb9dad5 nfsd: Always lock state exclusively.
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

Pull locking fixes from Ingo Molnar:
 "Misc fixes: lockstat fix, futex fix on !MMU systems, big endian fix
  for qrwlocks and a race fix for pvqspinlocks"

* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  locking/pvqspinlock: Fix a bug in qstat_read()
  locking/pvqspinlock: Fix double hash race
  locking/qrwlock: Fix write unlock bug on big endian systems
  futex: Assume all mappings are private on !MMU systems

Pull irq fix from Ingo Molnar:
 "A fix for an MSI regression"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq/msi: Make sure PCI MSIs are activated early

Pull EFI fixes from Ingo Molnar:
 "A fix for EFI capsules and an SGI UV platform fix"

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi/capsule: Allocate whole capsule into virtual memory
  x86/platform/uv: Skip UV runtime services mapping in the efi_runtime_disabled case

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

   - Stable patch from Olga to fix RPCSEC_GSS upcalls when the same user
     needs multiple different security services (e.g.  krb5i and krb5p).

   - Stable patch to fix a regression introduced by the use of
     SO_REUSEPORT, and that prevented the use of multiple different NFS
     versions to the same server.

   - TCP socket reconnection timer fixes.

   - Patch from Neil to disable the use of IPv6 temporary addresses"

* tag 'nfs-for-4.8-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFSv4: Cap the transport reconnection timer at 1/2 lease period
  NFSv4: Cleanup the setting of the nfs4 lease period
  SUNRPC: Limit the reconnect backoff timer to the max RPC message timeout
  SUNRPC: Fix reconnection timeouts
  NFSv4.2: LAYOUTSTATS may return NFS4ERR_ADMIN/DELEG_REVOKED
  SUNRPC: disable the use of IPv6 temporary addresses.
  SUNRPC: allow for upcalls for same uid but different gss service
  SUNRPC: Fix up socket autodisconnect
  SUNRPC: Handle EADDRNOTAVAIL on connection failures

Pull libnvdimm fixes from Dan Williams:

 - Fix for the nd_blk (NVDIMM Block Window Aperture) driver.

   A spec clarification requires the driver to mask off reserved bits in
   status register.  This is tagged for -stable back to the v4.2 kernel.

 - Fix for a kernel crash in the nvdimm unit tests when module loading
   is interrupted with SIGTERM.  Tagged for -stable since validation
   efforts external to Intel use the unit tests for qualifying
   backports.

 - Add a new 'size' sysfs attribute for the BTT (NVDIMM Block
   Translation Table) driver to make it symmetric with the other
   namespace personality drivers (PFN and DAX) that provide a size
   attribute for indicating how much namespace capacity is lost to
   metadata.

   The BTT change arrived at the start of the merge window and has
   appeared in a -next release.  It can technically wait for 4.9, but it
   is small, fixes asymmetry in the libnvdimm-sysfs interface, and
   something I would have squeezed into the v4.8 pull request had it
   arrived a few days earlier.

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  tools/testing/nvdimm: fix SIGTERM vs hotplug crash
  nvdimm, btt: add a size attribute for BTTs
  libnvdimm, nd_blk: mask off reserved status bits