* origin_4.19/tmp-0567d2f:
Linux 4.19.9
HID: quirks: fix RetroUSB.com devices
mac80211: ignore NullFunc frames in the duplicate detection
mac80211: fix reordering of buffered broadcast packets
mac80211: ignore tx status for PS stations in ieee80211_tx_status_ext
mac80211: Clear beacon_int in ieee80211_do_stop
mac80211: fix GFP_KERNEL under tasklet context
mac80211_hwsim: Timer should be initialized before device registered
cfg80211: Fix busy loop regression in ieee80211_ie_split_ric()
libnvdimm, pfn: Pad pfn namespaces relative to other regions
kgdboc: fix KASAN global-out-of-bounds bug in param_set_kgdboc_var()
gnss: sirf: fix activation retry handling
tty: do not set TTY_IO_ERROR flag if console port
tty: serial: 8250_mtk: always resume the device in probe.
Drivers: hv: vmbus: Offload the handling of channels to two workqueues
x86/efi: Allocate e820 buffer before calling efi_exit_boot_service
kprobes/x86: Fix instruction patching corruption when copying more than one RIP-relative instruction
drm/i915: Downgrade Gen9 Plane WM latency error
drm/amdgpu/gmc8: always load MC firmware in the driver
drm/amdgpu/gmc8: update MC firmware for polaris
drm/msm: Move fence put to where failure occurs
drm/lease: Send a distinct uevent
drm/amdgpu: update mc firmware image for polaris12 variants
crypto: do not free algorithm before using
Revert commit ef9209b642 "staging: rtl8723bs: Fix indenting errors and an off-by-one mistake in core/rtw_mlme_ext.c"
staging: rtl8712: Fix possible buffer overrun
cifs: Fix separator when building path from dentry
Revert "x86/e820: put !E820_TYPE_RAM regions into memblock.reserved"
arm64: dts: rockchip: remove vdd_log from rock960 to fix a stability issues
xhci: Prevent U1/U2 link pm states if exit latency is too long
xhci: workaround CSS timeout on AMD SNPS 3.0 xHC
ARM: 8806/1: kprobes: Fix false positive with FORTIFY_SOURCE
dmaengine: cppi41: delete channel from pending list when stop channel
dmaengine: imx-sdma: use GFP_NOWAIT for dma descriptor allocations
dmaengine: imx-sdma: implement channel termination via worker
Revert "dmaengine: imx-sdma: alloclate bd memory from dma pool"
Revert "dmaengine: imx-sdma: Use GFP_NOWAIT for dma allocations"
dmaengine: dw: Fix FIFO size for Intel Merrifield
SUNRPC: Fix leak of krb5p encode pages
arm64: hibernate: Avoid sending cross-calling with interrupts disabled
vhost/vsock: fix use-after-free in network stack callers
virtio/s390: fix race in ccw_io_helper()
virtio/s390: avoid race on vcdev->config
parisc: Enable -ffunction-sections for modules on 32-bit kernel
Revert "mfd: cros_ec: Use devm_kzalloc for private data"
media: dvb-pll: don't re-validate tuner frequencies
media: dvb-pll: fix tuner frequency ranges
media: vicodec: fix memchr() kernel oops
media: gspca: fix frame overflow error
ALSA: hda/realtek: Fix mic issue on Acer AIO Veriton Z4860G/Z6860G
ALSA: hda/realtek: Fix mic issue on Acer AIO Veriton Z4660G
ALSA: hda/realtek - Add support for Acer Aspire C24-860 headset mic
ALSA: hda/realtek: ALC286 mic and headset-mode fixups for Acer Aspire U27-880
ALSA: hda/realtek - Fix speaker output regression on Thinkpad T570
ALSA: pcm: Fix interval evaluation with openmin/max
ALSA: pcm: Call snd_pcm_unlink() conditionally at closing
ALSA: pcm: Fix starvation on down_write_nonblock()
ALSA: hda: Add support for AMD Stoney Ridge
ALSA: usb-audio: Fix UAF decrement if card has no live interfaces in card.c
ALSA: usb-audio: Add SMSL D1 to quirks for native DSD support
USB: serial: console: fix reported terminal settings
USB: check usb_get_extra_descriptor for proper size
usb: appledisplay: Add 27" Apple Cinema Display
usb: quirk: add no-LPM quirk on SanDisk Ultra Flair device
net: amd: add missing of_node_put()
team: no need to do team_notify_peers or team_mcast_rejoin when disabling port
ibmvnic: Update driver queues after change in ring size support
ibmvnic: Fix RX queue buffer cleanup
flexfiles: use per-mirror specified stateid for IO
NFSv4.2 copy do not allocate memory under the lock
iommu/vt-d: Use memunmap to free memremap
net: faraday: ftmac100: remove netif_running(netdev) check before disabling interrupts
riscv: fix warning in arch/riscv/include/asm/module.h
net/ibmnvic: Fix deadlock problem in reset
qed: Fix QM getters to always return a valid pq
qed: Fix bitmap_weight() check
NFSv4: Fix a NFSv4 state manager deadlock
net: ena: fix crash during failed resume from hibernation
mtd: spi-nor: Fix Cadence QSPI page fault kernel panic
HID: multitouch: Add pointstick support for Cirque Touchpad
Revert "HID: uhid: use strlcpy() instead of strncpy()"
cpufreq: ti-cpufreq: Only register platform_device when supported
mtd: rawnand: qcom: Namespace prefix some commands
tc-testing: tdc.py: Guard against lack of returncode in executed command
tc-testing: tdc.py: ignore errors when decoding stdout/stderr
gpio: mockup: fix indicated direction
gpio: pxa: fix legacy non pinctrl aware builds again
drivers/net/ethernet/qlogic/qed/qed_rdma.h: fix typo
net/mlx4: Fix UBSAN warning of signed integer overflow
net/mlx4_core: Fix uninitialized variable compilation warning
net/mlx4_core: Zero out lkey field in SW2HW_MPT fw command
drm/amd/display: Support amdgpu "max bpc" connector property (v2)
drm/amdgpu: Add amdgpu "max bpc" connector property (v2)
bnxt_en: Fix filling time in bnxt_fill_coredump_record()
nvme-fc: resolve io failures during connect
s390/ism: clear dmbe_mask bit before SMC IRQ handling
Revert "usb: gadget: ffs: Fix BUG when userland exits with submitted AIO transfers"
usb: dwc2: pci: Fix an error code in probe
qed: Fix reading wrong value in loop condition
qed: Fix rdma_info structure allocation
qed: Fix overriding offload_tc by protocols without APP TLV
qed: Fix PTT leak in qed_drain()
bnx2x: Assign unique DMAE channel number for FW DMAE transactions.
amd/iommu: Fix Guest Virtual APIC Log Tail Address Register
batman-adv: Expand merged fragment buffer for full packet
batman-adv: Use explicit tvlv padding for ELP packets
HID: input: Ignore battery reported by Symbol DS4308
test_firmware: fix error return getting clobbered
can: rcar_can: Fix erroneous registration
can: ucan: remove set but not used variable 'udev'
scsi: ufs: Fix hynix ufs bug with quirk on hi36xx SoC
iommu/ipmmu-vmsa: Fix crash on early domain free
mt76: fix building without CONFIG_LEDS_CLASS
brcmutil: really fix decoding channel info for 160 MHz bandwidth
iommu/vt-d: Fix NULL pointer dereference in prq_event_thread()
media: ipu3-cio2: Unregister device nodes first, then release resources
media: omap3isp: Unregister media device as first
media: cec: check for non-OK/NACK conditions while claiming a LA
media: vicodec: lower minimum height to 360
ANDROID: cuttlefish_defconfig: Enable VIRT_WIFI
FROMGIT: mac80211-next: rtnetlink wifi simulation device
Linux 4.19.8
blk-mq: punt failed direct issue to dispatch list
tipc: use destination length for copy string
arc: [devboards] Add support of NFSv3 ACL
ARC: change defconfig defaults to ARCv2
btrfs: tree-checker: Don't check max block group size as current max chunk size limit is unreliable
Input: elan_i2c - add support for ELAN0621 touchpad
Input: elan_i2c - add ACPI ID for Lenovo IdeaPad 330-15ARR
Input: elan_i2c - add ELAN0620 to the ACPI table
Input: cros_ec_keyb - fix button/switch capability reports
Input: matrix_keypad - check for errors from of_get_named_gpio()
Input: synaptics - add PNP ID for ThinkPad P50 to SMBus
Input: xpad - quirk all PDP Xbox One gamepads
scsi: lpfc: fix block guard enablement on SLI3 adapters
i40e: Fix deletion of MAC filters
selinux: add support for RTM_NEWCHAIN, RTM_DELCHAIN, and RTM_GETCHAIN
svm: Add mutex_lock to protect apic_access_page_done on AMD systems
kgdboc: Fix warning with module build
kgdboc: Fix restrict error
userfaultfd: shmem: UFFDIO_COPY: set the page dirty if VM_WRITE is not set
userfaultfd: shmem: add i_size checks
userfaultfd: shmem: allocate anonymous memory for MAP_PRIVATE shmem
userfaultfd: use ENOENT instead of EFAULT if the atomic copy user fails
drm/meson: Fix OOB memory accesses in meson_viu_set_osd_lut()
drm/meson: Enable fast_io in meson_dw_hdmi_regmap_config
drm/meson: Fixes for drm_crtc_vblank_on/off support
drm: set is_master to 0 upon drm_new_set_master() failure
drm/amd/dm: Don't forget to attach MST encoders
drm/ast: Fix incorrect free on ioregs
tracing/fgraph: Fix set_graph_function from showing interrupts
IB/mlx5: Avoid load failure due to unknown link width
mips: fix mips_get_syscall_arg o32 check
MIPS: ralink: Fix mt7620 nd_sd pinmux
tracepoint: Use __idx instead of idx in DO_TRACE macro to make it unique
sched, trace: Fix prev_state output in sched_switch tracepoint
arm64: ftrace: Fix to enable syscall events on arm64
mtd: nand: Fix memory allocation in nanddev_bbt_init()
uprobes: Fix handle_swbp() vs. unregister() + register() race once more
iser: set sector for ambiguous mr status errors
unifdef: use memcpy instead of strncpy
test_hexdump: use memcpy instead of strncpy
blk-mq: fix corruption with direct issue
ANDROID: cuttlefish_defconfig: Enable CONFIG_ARM64_LSE_ATOMICS
ANDROID: Move from clang r328903 to r346389b.
Linux 4.19.7
misc: mic/scif: fix copy-paste error in scif_create_remote_lookup
Drivers: hv: vmbus: check the creation_status in vmbus_establish_gpadl()
mm: use swp_offset as key in shmem_replace_page()
mm: cleancache: fix corruption on missed inode invalidation
lib/test_kmod.c: fix rmmod double free
iio:st_magn: Fix enable device after trigger
iio/hid-sensors: Fix IIO_CHAN_INFO_RAW returning wrong values for signed numbers
Revert "usb: dwc3: gadget: skip Set/Clear Halt when invalid"
usb: core: quirks: add RESET_RESUME quirk for Cherry G230 Stream series
USB: usb-storage: Add new IDs to ums-realtek
staging: rtl8723bs: Add missing return for cfg80211_rtw_get_station
staging: rtl8723bs: Fix incorrect sense of ether_addr_equal
staging: mt7621-pinctrl: fix uninitialized variable ngroups
staging: mt7621-dma: fix potentially dereferencing uninitialized 'tx_desc'
staging: vchiq_arm: fix compat VCHIQ_IOC_AWAIT_COMPLETION
staging: most: use format specifier "%s" in snprintf
dmaengine: at_hdmac: fix module unloading
dmaengine: at_hdmac: fix memory leak in at_dma_xlate()
ARM: dts: rockchip: Remove @0 from the veyron memory node
ASoC: pcm186x: Fix device reset-registers trigger value
ASoC: intel: cht_bsw_max98090_ti: Add quirk for boards using pmc_plt_clk_0
ext2: fix potential use after free
ext2: initialize opts.s_mount_opt as zero before using it
binder: fix race that allows malicious free of live buffer
function_graph: Reverse the order of pushing the ret_stack and the callback
function_graph: Move return callback before update of curr_ret_stack
function_graph: Have profiler use curr_ret_stack and not depth
function_graph: Use new curr_ret_depth to manage depth instead of curr_ret_stack
function_graph: Make ftrace_push_return_trace() static
MIPS: function_graph: Simplify with function_graph_enter()
arm64: function_graph: Simplify with function_graph_enter()
s390/function_graph: Simplify with function_graph_enter()
riscv/function_graph: Simplify with function_graph_enter()
parisc: function_graph: Simplify with function_graph_enter()
sparc/function_graph: Simplify with function_graph_enter()
sh/function_graph: Simplify with function_graph_enter()
powerpc/function_graph: Simplify with function_graph_enter()
nds32: function_graph: Simplify with function_graph_enter()
x86/function_graph: Simplify with function_graph_enter()
microblaze: function_graph: Simplify with function_graph_enter()
ARM: function_graph: Simplify with function_graph_enter()
function_graph: Create function_graph_enter() to consolidate architecture code
ALSA: hda/realtek - Add auto-mute quirk for HP Spectre x360 laptop
ALSA: hda/realtek - fix the pop noise on headphone for lenovo laptops
ALSA: hda/realtek - fix headset mic detection for MSI MS-B171
ALSA: hda/realtek - Support ALC300
ALSA: hda: Add ASRock N68C-S UCC the power_save blacklist
ALSA: sparc: Fix invalid snd_free_pages() at error path
ALSA: control: Fix race between adding and removing a user element
ALSA: ac97: Fix incorrect bit shift at AC97-SPSA control write
ALSA: wss: Fix invalid snd_free_pages() at error path
fs: fix lost error code in dio_complete
perf/x86/intel: Disallow precise_ip on BTS events
perf/x86/intel: Add generic branch tracing check to intel_pmu_has_bts()
perf/x86/intel: Move branch tracing setup to the Intel-specific source file
x86/fpu: Disable bottom halves while loading FPU registers
x86/MCE/AMD: Fix the thresholding machinery initialization order
arm64: dts: rockchip: Fix PCIe reset polarity for rk3399-puma-haikou.
PCI: Fix incorrect value returned from pcie_get_speed_cap()
PCI: dwc: Fix MSI-X EP framework address calculation bug
PCI: layerscape: Fix wrong invocation of outbound window disable accessor
btrfs: relocation: set trans to be NULL after ending transaction
Btrfs: fix race between enabling quotas and subvolume creation
Btrfs: fix rare chances for data loss when doing a fast fsync
Btrfs: ensure path name is null terminated at btrfs_control_ioctl
btrfs: Always try all copies when reading extent buffers
udf: Allow mounting volumes with incorrect identification strings
xtensa: fix coprocessor part of ptrace_{get,set}xregs
xtensa: fix coprocessor context offset definitions
xtensa: enable coprocessors that are being flushed
KVM: VMX: re-add ple_gap module parameter
KVM: X86: Fix scan ioapic use-before-initialization
KVM: LAPIC: Fix pv ipis use-before-initialization
KVM: x86: Fix kernel info-leak in KVM_HC_CLOCK_PAIRING hypercall
KVM: nVMX/nSVM: Fix bug which sets vcpu->arch.tsc_offset to L1 tsc_offset
kvm: svm: Ensure an IBPB on all affected CPUs when freeing a vmcb
kvm: mmu: Fix race in emulated page table writes
userfaultfd: shmem/hugetlbfs: only allow to register VM_MAYWRITE vmas
x86/speculation: Provide IBPB always command line options
x86/speculation: Add seccomp Spectre v2 user space protection mode
x86/speculation: Enable prctl mode for spectre_v2_user
x86/speculation: Add prctl() control for indirect branch speculation
x86/speculation: Prepare arch_smt_update() for PRCTL mode
x86/speculation: Prevent stale SPEC_CTRL msr content
x86/speculation: Split out TIF update
ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS
x86/speculation: Prepare for conditional IBPB in switch_mm()
x86/speculation: Avoid __switch_to_xtra() calls
x86/process: Consolidate and simplify switch_to_xtra() code
x86/speculation: Prepare for per task indirect branch speculation control
x86/speculation: Add command line control for indirect branch speculation
x86/speculation: Unify conditional spectre v2 print functions
x86/speculataion: Mark command line parser data __initdata
x86/speculation: Mark string arrays const correctly
x86/speculation: Reorder the spec_v2 code
x86/l1tf: Show actual SMT state
x86/speculation: Rework SMT state change
sched/smt: Expose sched_smt_present static key
x86/Kconfig: Select SCHED_SMT if SMP enabled
sched/smt: Make sched_smt_present track topology
x86/speculation: Reorganize speculation control MSRs update
x86/speculation: Rename SSBD update functions
x86/speculation: Disable STIBP when enhanced IBRS is in use
x86/speculation: Move STIPB/IBPB string conditionals out of cpu_show_common()
x86/speculation: Remove unnecessary ret variable in cpu_show_common()
x86/speculation: Clean up spectre_v2_parse_cmdline()
x86/speculation: Update the TIF_SSBD comment
x86/retpoline: Remove minimal retpoline support
x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support
x86/speculation: Add RETPOLINE_AMD support to the inline asm CALL_NOSPEC variant
x86/speculation: Propagate information about RSB filling mitigation to sysfs
x86/speculation: Apply IBPB more strictly to avoid cross-process data leak
x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation
tipc: fix lockdep warning during node delete
net: phy: add workaround for issue where PHY driver doesn't bind to the device
tcp: defer SACK compression after DupThresh
net/dim: Update DIM start sample after each DIM iteration
virtio-net: fail XDP set if guest csum is negotiated
virtio-net: disable guest csum during XDP set
net: skb_scrub_packet(): Scrub offload_fwd_mark
net: thunderx: set xdp_prog to NULL if bpf_prog_add fails
usbnet: ipheth: fix potential recvmsg bug and recvmsg bug 2
s390/qeth: fix length check in SNMP processing
rapidio/rionet: do not free skb before reading its length
packet: copy user buffers before orphan or clone
net: thunderx: set tso_hdrs pointer to NULL in nicvf_free_snd_queue
net: gemini: Fix copy/paste error
net: don't keep lonely packets forever in the gro hash
lan743x: fix return value for lan743x_tx_napi_poll
lan743x: Enable driver to work with LAN7431
mm/khugepaged: collapse_shmem() do not crash on Compound
mm/khugepaged: collapse_shmem() without freezing new_page
mm/khugepaged: minor reorderings in collapse_shmem()
mm/khugepaged: collapse_shmem() remember to clear holes
mm/khugepaged: fix crashes due to misaccounted holes
mm/khugepaged: collapse_shmem() stop if punched or truncated
mm/huge_memory: fix lockdep complaint on 32-bit i_size_read()
mm/huge_memory: splitting set mapping+index before unfreeze
mm/huge_memory: rename freeze_page() to unmap_page()
ANDROID: cuttlefish_defconfig: Enable CONFIG_CRYPTO_ADIANTUM
FROMGIT: fscrypt: add Adiantum support
BACKPORT, FROMGIT: crypto: adiantum - add Adiantum support
FROMGIT: crypto: arm/nhpoly1305 - add NEON-accelerated NHPoly1305
FROMGIT: crypto: nhpoly1305 - add NHPoly1305 support
FROMGIT: crypto: poly1305 - add Poly1305 core API
FROMGIT: crypto: poly1305 - use structures for key and accumulator
FROMGIT: crypto: arm/chacha - add XChaCha12 support
FROMGIT: crypto: arm/chacha20 - refactor to allow varying number of rounds
FROMGIT: crypto: arm/chacha20 - add XChaCha20 support
FROMGIT: crypto: arm/chacha20 - limit the preemption-disabled section
FROMGIT: crypto: chacha - add XChaCha12 support
BACKPORT, FROMGIT: crypto: chacha20-generic - refactor to allow varying number of rounds
FROMGIT: crypto: chacha20-generic - add XChaCha20 support
FROMGIT: crypto: chacha20-generic - don't unnecessarily use atomic walk
FROMGIT: crypto: chacha20-generic - add HChaCha20 library function
FROMGIT: crypto: arm/aes - add some hardening against cache-timing attacks
UPSTREAM: crypto: arm/chacha20 - faster 8-bit rotations and other optimizations
UPSTREAM: crypto: chacha20 - Fix chacha20_block() keystream alignment (again)
ANDROID: cuttlefish_defconfig: Enable CONFIG_SDCARD_FS
ANDROID: sdcardfs: Add sdcardfs filesystem
ANDROID: sdcardfs: Define magic value
ANDROID: fs: Restore vfs_path_lookup() export
ANDROID: vfs: add d_canonical_path for stacked filesystem support
ANDROID: vfs: Add permission2 for filesystems with per mount permissions
ANDROID: vfs: Add setattr2 for filesystems with per mount permissions
ANDROID: vfs: Allow filesystems to access their private mount data
ANDROID: mnt: Add filesystem private data to mount points
ANDROID: sdcardfs: Enable modular sdcardfs
Revert "proc: Convert proc_mount to use mount_ns."
ANDROID: binder: add support for RT prio inheritance.
UPSTREAM: binder: Add BINDER_GET_NODE_INFO_FOR_REF ioctl.
ANDROID: net: ipv6: autoconf routes into per-device tables
ANDROID: cuttlefish_defconfig: Enable SECURITY_PERF_EVENTS_RESTRICT
ANDROID: security,perf: Allow further restriction of perf_event_open
ANDROID: netfilter: xt_IDLETIMER: Add new netlink msg type
ANDROID: cuttlefish_defconfig: Enable CONFIG_NETFILTER_XT_MATCH_QUOTA2
ANDROID: netfilter: xt_quota2: adding the original quota2 from xtables-addons
ANDROID: power: wakeup_reason: add an API to log wakeup reasons
ANDROID: trace: sched: add sched blocked tracepoint which dumps out context of sleep.
ANDROID: add extra free kbytes tunable
CHROMIUM: cgroups: relax permissions on moving tasks between cgroups
ANDROID: cpu: send KOBJ_ONLINE event when enabling cpus
ANDROID: fs: FS tracepoints to track IO.
ANDROID: cuttlefish_defconfig: Enable CONFIG_DM_VERITY_AVB
ANDROID: AVB error handler to invalidate vbmeta partition.
ANDROID: cuttlefish_defconfig: Enable CONFIG_CPUSETS
ANDROID: cpuset: Make cpusets restore on hotplug
ANDROID: taskstats: track fsync syscalls
ANDROID: uid_cputime: add per-uid IO usage accounting
ANDROID: cuttlefish_defconfig: Enable CONFIG_UID_SYS_STATS
ANDROID: uid_cputime: Adds accounting for the cputimes per uid.
ANDROID: cuttlefish_defconfig: Enable CONFIG_MMC
ANDROID: mmc: core: Add "ignore mmc pm notify" functionality
ANDROID: cuttlefish_defconfig: Enable CONFIG_USB_CONFIGFS_F_AUDIO_SRC
ANDROID: usb: gadget: f_audio_source: New gadget driver for audio output
ANDROID: usb: gadget: f_midi: set fi->f to NULL when free f_midi function
ANDROID: usb: gadget: f_midi: create F_midi device
ANDROID: cuttlefish_defconfig: Enable CONFIG_USB_CONFIGFS_F_ACC
ANDROID: usb: gadget: f_accessory: Add Android Accessory function
ANDROID: usb: gadget: configfs: Add device attribute to determine gadget state
ANDROID: usb: gadget: configfs: Add "state" attribute to android_device
ANDROID: cuttlefish_defconfig: Enable CONFIG_USB_CONFIGFS_UEVENT
ANDROID: usb: gadget: configfs: Add function devices to the parent
ANDROID: usb: gadget: configfs: Add Uevent to notify userspace
ANDROID: usb: gadget: configfs: Add usb_function ptr to fi struct
ANDROID: mm: add a field to store names for private anonymous memory
ANDROID: fs: epoll: use freezable blocking call
ANDROID: cuttlefish_defconfig: Enable CONFIG_CMDLINE_EXTEND
ANDROID: of: Support CONFIG_CMDLINE_EXTEND config option
ANDROID: arm64: copy CONFIG_CMDLINE_EXTEND from ARM
UPSTREAM: tcp: start receiver buffer autotuning sooner
UPSTREAM: tcp: up initial rmem to 128KB and SYN rwin to around 64KB
ANDROID: net: xfrm: make PF_KEY SHA256 use RFC-compliant truncation.
ANDROID: cuttlefish_defconfig: Enable EAS related defines
BACKPORT: sched/fair: Fix cpu_util_wake() for 'execl' type workloads
ANDROID: defconfig / build config for cuttlefish
ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple
ANDROID: x86: Remove a useless warning message
Revert "x86: Force asm-goto"
Revert "x86: Allow generating user-space headers without a compiler"
Linux 4.19.6
media: ov5640: fix auto controls values when switching to manual mode
media: ov5640: fix wrong binning value in exposure calculation
media: ov5640: fix auto gain & exposure when changing mode
media: ov5640: fix exposure regression
media: ov5640: Fix timings setup code
media: ov5640: Re-work MIPI startup sequence
rcu: Make need_resched() respond to urgent RCU-QS needs
gfs2: Fix iomap buffer head reference counting bug
tty: wipe buffer if not echoing data
tty: wipe buffer.
include/linux/pfn_t.h: force '~' to be parsed as an unary operator
dax: Avoid losing wakeup in dax_lock_mapping_entry
mm, page_alloc: check for max order in hot path
tmpfs: make lseek(SEEK_DATA/SEK_HOLE) return ENXIO with a negative offset
mm, memory_hotplug: check zone_movable in has_unmovable_pages
z3fold: fix possible reclaim races
efi/arm: Revert deferred unmap of early memmap mapping
powerpc/numa: Suppress "VPHN is not supported" messages
NFSv4: Fix an Oops during delegation callbacks
kdb: Use strscpy with destination buffer size
drm/amdgpu: fix bug with IH ring setup
RISC-V: Silence some module warnings on 32-bit
riscv: add missing vdso_install target
SUNRPC: Fix a bogus get/put in generic_key_to_expire()
block: copy ioprio in __bio_clone_fast() and bounce
perf/x86/intel/uncore: Add more IMC PCI IDs for KabyLake and CoffeeLake CPUs
sched/fair: Fix cpu_util_wake() for 'execl' type workloads
powerpc/io: Fix the IO workarounds code to work with Radix
floppy: fix race condition in __floppy_read_block_0()
crypto: simd - correctly take reqsize of wrapped skcipher into account
rtc: pcf2127: fix a kmemleak caused in pcf2127_i2c_gather_write
rtc: cmos: Do not export alarm rtc_ops when we do not support alarms
cpufreq: imx6q: add return value check for voltage scale
KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE
scsi: hisi_sas: Remove set but not used variable 'dq_list'
scsi: lpfc: fix remoteport access
tools/testing/nvdimm: Fix the array size for dimm devices.
pinctrl: meson: fix meson8b ao pull register bits
pinctrl: meson: fix meson8 ao pull register bits
pinctrl: meson: fix gxl ao pull register bits
pinctrl: meson: fix gxbb ao pull register bits
pinctrl: meson: fix pinconf bias disable
fanotify: fix handling of events on child sub-directory
fsnotify: generalize handling of extra event flags
IB/hfi1: Eliminate races in the SDMA send error path
ACPICA: AML interpreter: add region addresses in global list during initialization
can: flexcan: remove not needed struct flexcan_priv::tx_mb and struct flexcan_priv::tx_mb_idx
can: flexcan: Always use last mailbox for TX
can: hi311x: Use level-triggered interrupt
can: raw: check for CAN FD capable netdev in raw_sendmsg()
can: flexcan: handle tx-complete CAN frames via rx-offload infrastructure
can: flexcan: use can_rx_offload_queue_sorted() for flexcan_irq_bus_*()
can: rx-offload: rename can_rx_offload_irq_queue_err_skb() to can_rx_offload_queue_tail()
can: rx-offload: introduce can_rx_offload_get_echo_skb() and can_rx_offload_queue_sorted() functions
can: dev: __can_get_echo_skb(): print error message, if trying to echo non existing skb
can: dev: __can_get_echo_skb(): Don't crash the kernel if can_priv::echo_skb is accessed out of bounds
can: dev: __can_get_echo_skb(): replace struct can_frame by canfd_frame to access frame length
can: dev: can_get_echo_skb(): factor out non sending code to __can_get_echo_skb()
can: flexcan: Unlock the MB unconditionally
drm/ast: Remove existing framebuffers before loading driver
drm/ast: fixed cursor may disappear sometimes
drm/ast: change resolution may cause screen blurred
drm/i915: Disable LP3 watermarks on all SNB machines
drm/amdgpu: Fix oops when pp_funcs->switch_power_profile is unset
drm/vc4: Set ->legacy_cursor_update to false when doing non-async updates
drm/amdgpu: Add missing firmware entry for HAINAN
drm/fb-helper: Blacklist writeback when adding connectors to fbdev
tcp: do not release socket ownership in tcp_close()
mm/memory.c: recheck page table entry with page table lock held
mm: don't warn about large allocations for slab
llc: do not use sk_eat_skb()
gfs2: Don't leave s_fs_info pointing to freed memory in init_sbd
sctp: clear the transport of some out_chunk_list chunks in sctp_assoc_rm_peer
bfs: add sanity check at bfs_fill_super()
Input: synaptics - avoid using uninitialized variable when probing
selinux: Add __GFP_NOWARN to allocation at str_read()
v9fs_dir_readdir: fix double-free on p9stat_read error
tools/power/cpupower: fix compilation with STATIC=true
opp: ti-opp-supply: Correct the supply in _get_optimal_vdd_voltage call
opp: ti-opp-supply: Dynamically update u_volt_min
brcmfmac: fix reporting support for 160 MHz channels
iwlwifi: mvm: don't use SAR Geo if basic SAR is not used
iwlwifi: mvm: fix regulatory domain update when the firmware starts
iwlwifi: mvm: support sta_statistics() even on older firmware
iwlwifi: fix wrong WGDS_WIFI_DATA_SIZE
gpio: don't free unallocated ida on gpiochip_add_data_with_key() error path
mmc: sdhci-pci: Workaround GLK firmware failing to restore the tuning value
mmc: sdhci-pci: Try "cd" for card-detect lookup before using NULL
Documentation/security-bugs: Postpone fix publication in exceptional cases
Documentation/security-bugs: Clarify treatment of embargoed information
MAINTAINERS: Add Sasha as a stable branch maintainer
ALSA: oss: Use kvzalloc() for local buffer allocations
usb: xhci: Prevent bus suspend if a port connect change or polling state is detected
xhci: Add quirk to workaround the errata seen on Cavium Thunder-X2 Soc
usb: xhci: fix timeout for transition from RExit to U0
usb: xhci: fix uninitialized completion when USB3 port got wrong status
xhci: Add check for invalid byte size error when UAS devices are connected.
xhci: handle port status events for removed USB3 hcd
xhci: Fix leaking USB3 shared_hcd at xhci removal
usb: dwc3: Fix NULL pointer exception in dwc3_pci_remove()
usb: dwc3: core: Clean up ULPI device
usb: dwc3: gadget: Properly check last unaligned/zero chain TRB
usb: dwc3: gadget: fix ISOC TRB type on unaligned transfers
usb: core: Fix hub port connection events lost
efi/libstub: arm: support building with clang
HID: steam: remove input device when a hid client is running.
Linux 4.19.5
mt76x0: run vco calibration for each channel configuration
libceph: fall back to sendmsg for slab pages
HID: Add quirk for Microsoft PIXART OEM mouse
HID: Add quirk for Primax PIXART OEM mice
HID: uhid: forbid UHID_CREATE under KERNEL_DS or elevated privileges
ACPI / platform: Add SMB0001 HID to forbidden_id_list
drivers/misc/sgi-gru: fix Spectre v1 vulnerability
mtd: rawnand: atmel: fix OF child-node lookup
gnss: sirf: fix synchronous write timeout
gnss: serial: fix synchronous write timeout
USB: misc: appledisplay: add 20" Apple Cinema Display
misc: atmel-ssc: Fix section annotation on atmel_ssc_get_driver_data
usb: quirks: Add delay-init quirk for Corsair K70 LUX RGB
USB: Wait for extra delay time after USB_PORT_FEAT_RESET for quirky hub
USB: quirks: Add no-lpm quirk for Raydium touchscreens
usb: cdc-acm: add entry for Hiro (Conexant) modem
can: kvaser_usb: Fix potential uninitialized variable use
can: kvaser_usb: Fix accessing freed memory in kvaser_usb_start_xmit()
ALSA: hda/ca0132 - Call pci_iounmap() instead of iounmap()
ALSA: hda/realtek - Add quirk entry for HP Pavilion 15
uio: Fix an Oops on load
RISC-V: Fix raw_copy_{to,from}_user()
MIPS: OCTEON: cavium_octeon_defconfig: re-enable OCTEON USB driver
media: v4l: event: Add subscription to list before calling "add" operation
x86/ldt: Remove unused variable in map_ldt_struct()
x86/ldt: Unmap PTEs for the slot before freeing LDT pages
x86/mm: Move LDT remap out of KASLR region on 5-level paging
SUNRPC: drop pointless static qualifier in xdr_get_next_encode_buffer()
Revert "scripts/setlocalversion: git: Make -dirty check more robust"
kbuild: deb-pkg: fix too low build version number
net: aquantia: invalid checksumm offload implementation
net: aquantia: fixed enable unicast on 32 macvlan
net: aquantia: fix potential IOMMU fault after driver unbind
net: stmmac: Fix RX packet size > 8191
qed: Fix potential memory corruption
qed: Fix SPQ entries not returned to pool in error flows
qed: Fix blocking/unlimited SPQ entries leak
qed: Fix memory/entry leak in qed_init_sp_request()
i40e: restore NETIF_F_GSO_IPXIP[46] to netdev features
ice: Change req_speeds to be u16
ice: Fix the bytecount sent to netdev_tx_sent_queue
ice: Fix dead device link issue with flow control
perf tools: Do not zero sample_id_all for group members
perf tools: Fix undefined symbol scnprintf in libperf-jvmti.so
sched/core: Take the hotplug lock in sched_init_smp()
i2c: qcom-geni: Fix runtime PM mismatch with child devices
i2c: omap: Enable for ARCH_K3
nvme: make sure ns head inherits underlying device limits
of/device: Really only set bus DMA mask when appropriate
ceph: quota: fix null pointer dereference in quota check
s390/perf: Change CPUM_CF return code in event init function
drm/amd/amdgpu/dm: Fix dm_dp_create_fake_mst_encoder()
drm/amd/display: Drop reusing drm connector for MST
block: Clear kernel memory before copying to user
drm/amd/display: Stop leaking planes
lib/raid6: Fix arm64 test build
mtd: nand: Fix nanddev_pos_next_page() kernel-doc header
clk: fixed-factor: fix of_node_get-put imbalance
xen/grant-table: Fix incorrect gnttab_dma_free_pages() pr_debug message
arm64: dts: renesas: condor: switch from EtherAVB to GEther
arm64: dts: renesas: r8a7795: add missing dma-names on hscif2
Revert "drm/exynos/decon5433: implement frame counter"
ARM: dts: fsl: Fix improperly quoted stdout-path values
ARM: dts: imx6sll: fix typo for fsl,imx6sll-i2c node
hwmon: (ibmpowernv) Remove bogus __init annotations
net: hns3: Fix for out-of-bounds access when setting pfc back pressure
s390/qeth: unregister netdevice only when registered
s390/qeth: fix HiperSockets sniffer
netfilter: nft_compat: ebtables 'nat' table is normal chain type
netfilter: ipset: Fix calling ip_set() macro at dumping
netfilter: xt_IDLETIMER: add sysfs filename checking routine
netfilter: ipset: Correct rcu_dereference() call in ip_set_put_comment()
bpf: fix bpf_prog_get_info_by_fd to return 0 func_lens for unpriv
s390/mm: Fix ERROR: "__node_distance" undefined!
s390/mm: fix mis-accounting of pgtable_bytes
netfilter: ipset: fix ip_set_list allocation failure
netfilter: ipset: actually allow allowable CIDR 0 in hash:net,port,net
netfilter: ipset: list:set: Decrease refcount synchronously on deletion and replace
Revert "netfilter: nft_numgen: add map lookups for numgen random operations"
HID: alps: allow incoming reports when only the trackstick is opened
Revert "HID: add NOGET quirk for Eaton Ellipse MAX UPS"
HID: i2c-hid: Add a small delay after sleep command for Raydium touchpanel
s390/vdso: add missing FORCE to build targets
s390/decompressor: add missing FORCE to build targets
netfilter: bridge: define INT_MIN & INT_MAX in userspace
netfilter: ipv6: fix oops when defragmenting locally generated fragments
serial: sh-sci: Fix receive on SCIFA/SCIFB variants with DMA
clk: ti: fix OF child-node lookup
clk: renesas: r9a06g032: Fix UART34567 clock rate
clk: meson: clk-pll: drop CLK_GET_RATE_NOCACHE where unnecessary
arm64: percpu: Initialize ret in the default case
clk: meson-axg: pcie: drop the mpll3 clock parent
platform/x86: acerhdf: Add BIOS entry for Gateway LT31 v1.3307
x86/earlyprintk: Add a force option for pciserial device
apparmor: Fix uninitialized value in aa_split_fqname
clk: samsung: exynos5420: Enable PERIS clocks for suspend
fs/exofs: fix potential memory leak in mount option parsing
perf symbols: Set PLT entry/header sizes properly on Sparc
clk: fixed-rate: fix of_node_get-put imbalance
platform/x86: intel_telemetry: report debugfs failure
afs: Handle EIO from delivery function
drm/edid: Add 6 bpc quirk for BOE panel.
um: Give start_idle_thread() a return code
perf unwind: Take pgoff into account when reporting elf to libdwfl
hfsplus: prevent btree data loss on root split
hfs: prevent btree data loss on root split
reiserfs: propagate errors from fill_with_dentries() properly
ixgbe: fix MAC anti-spoofing filter after VFLR
net: hns3: bugfix for the initialization of command queue's spin lock
net: hns3: bugfix for handling mailbox while the command queue reinitialized
net: hns3: bugfix for rtnl_lock's range in the hclge_reset()
net: hns3: bugfix for rtnl_lock's range in the hclgevf_reset()
block: brd: associate with queue until adding disk
arm64: kprobe: make page to RO mode when allocate it
cifs: fix return value for cifs_listxattr
cifs: don't dereference smb_file_target before null check
drm/i915: Replace some PAGE_SIZE with I915_GTT_PAGE_SIZE
f2fs: fix to keep project quota consistent
f2fs: guarantee journalled quota data by checkpoint
f2fs: cleanup dirty pages if recover failed
f2fs: fix data corruption issue with hardware encryption
f2fs: fix to recover inode->i_flags of inode block during POR
f2fs: spread f2fs_set_inode_flags()
f2fs: fix to spread clear_cold_data()
Revert "f2fs: fix to clear PG_checked flag in set_page_dirty()"
f2fs: account read IOs and use IO counts for is_idle
f2fs: fix to account IO correctly for cgroup writeback
f2fs: fix to account IO correctly
f2fs: remove request_list check in is_idle()
f2fs: allow to mount, if quota is failed
f2fs: update REQ_TIME in f2fs_cross_rename()
f2fs: do not update REQ_TIME in case of error conditions
f2fs: remove unneeded disable_nat_bits()
f2fs: remove unused sbi->trigger_ssr_threshold
f2fs: shrink sbi->sb_lock coverage in set_file_temperature()
f2fs: use rb_*_cached friends
f2fs: fix to recover cold bit of inode block during POR
f2fs: submit cached bio to avoid endless PageWriteback
f2fs: checkpoint disabling
f2fs: clear PageError on the read path
f2fs: allow out-place-update for direct IO in LFS mode
f2fs: refactor ->page_mkwrite() flow
Revert: "f2fs: check last page index in cached bio to decide submission"
f2fs: support superblock checksum
f2fs: add to account skip count of background GC
f2fs: add to account meta IO
f2fs: keep lazytime on remount
f2fs: fix missing up_read
f2fs: return correct errno in f2fs_gc
f2fs: avoid f2fs_bug_on if f2fs_get_meta_page_nofail got EIO
f2fs: mark inode dirty explicitly in recover_inode()
f2fs: fix to recover inode's crtime during POR
f2fs: fix to recover inode's i_gc_failures during POR
f2fs: fix to recover inode's i_flags during POR
f2fs: fix to recover inode's project id during POR
f2fs: update i_size after DIO completion
f2fs: report ENOENT correctly in f2fs_rename
f2fs: fix remount problem of option io_bits
f2fs: fix to recover inode's uid/gid during POR
f2fs: avoid infinite loop in f2fs_alloc_nid
f2fs: add new idle interval timing for discard and gc paths
f2fs: split IO error injection according to RW
f2fs: add SPDX license identifiers
f2fs: surround fault_injection related option parsing using CONFIG_F2FS_FAULT_INJECTION
f2fs: fix setattr project check upon fssetxattr ioctl
f2fs: avoid sleeping under spin_lock
f2fs: plug readahead IO in readdir()
f2fs: fix to do sanity check with current segment number
f2fs: fix memory leak of percpu counter in fill_super()
f2fs: fix memory leak of write_io in fill_super()
f2fs: cache NULL when both default_acl and acl are NULL
f2fs: fix to flush all dirty inodes recovered in readonly fs
f2fs: report error if quota off error during umount
f2fs: submit bio after shutdown
f2fs: avoid wrong decrypted data from disk
Revert "f2fs: use printk_ratelimited for f2fs_msg"
f2fs: fix unnecessary periodic wakeup of discard thread when dev is busy
f2fs: fix to avoid NULL pointer dereference on se->discard_map
f2fs: add additional sanity check in f2fs_acl_from_disk()
ANDROID: arm64: defconfig: Enable CONFIG_SCHED_TUNE
ANDROID: thermal: cpu_cooling: Migrate to using the EM framework
ANDROID: Add hold functionality to schedtune CPU boost
ANDROID: sched/rt: Add schedtune accounting to rt task enqueue/dequeue
ANDROID: sched: Make the cpu_util* accessors available without sugov
ANDROID: sched/events: Introduce overutilized trace event
ANDROID: sched/events: Introduce rt_rq load tracking trace event
ANDROID: sched/events: Introduce schedtune trace events
ANDROID: sched/events: Introduce find_best_target trace event
ANDROID: sched/events: Introduce util_est trace events
ANDROID: sched/events: Introduce task_group load tracking trace event
ANDROID: sched/events: Introduce sched_entity load tracking trace event
ANDROID: sched/events: Introduce cfs_rq load tracking trace event
ANDROID: sched/autogroup: Define autogroup_path() for !CONFIG_SCHED_DEBUG
ANDROID: sched/fair: Also do misfit in overloaded groups
ANDROID: sched/fair: Don't balance misfits if it would overload local group
ANDROID: sched/fair: Attempt to improve throughput for asym cap systems
ANDROID: cpufreq/schedutil: add up/down frequency transition rate limits
ANDROID: cpufreq/schedutil: Select frequency using util_avg for RT
ANDROID: sched: Update max cpu capacity in case of max frequency constraints
ANDROID: arm: enable max frequency capping
ANDROID: arm64: enable max frequency capping
ANDROID: implement max frequency capping
ANDROID: sched/fair: add arch scaling function for max frequency capping
ANDROID: sched/fair: Bypass energy computation for prefer_idle tasks
ANDROID: sched: fair: Bypass energy-aware wakeup for prefer-idle tasks
FROMLIST: sched/fair: Use wake_q length as a hint for wake_wide
ANDROID: sched: Unconditionally honor sync flag for energy-aware wakeups
ANDROID: Add find_best_target to minimise energy calculation overhead
ANDROID: sched/fair: Factor out CPU selection from find_energy_efficient_cpu
ANDROID: sched: Introduce sysctl_sched_cstate_aware
ANDROID: sched, cpuidle: Track cpuidle state index in the scheduler
ANDROID: sched: fair/tune: Add schedtune with cgroups interface
ANDROID: drivers: Introduce a legacy Energy Model loading driver
ANDROID: cpufreq: scmi: Register an Energy Model
UPSTREAM: firmware: arm_scmi: add a getter for power of performance states
ANDROID: cpufreq: arm_big_little: Register an Energy Model
ANDROID: cpufreq: scpi: Register an Energy Model
ANDROID: PM / OPP: cpufreq-dt: Move power estimation function
FROMLIST: cpufreq: dt: Register an Energy Model
ANDROID: arm: dts: vexpress-v2p-ca15_a7: Add dynamic-power-coefficient properties
ANDROID: arm64: dts: juno-r2: Add dynamic-power-coefficient properties
ANDROID: arm64: dts: juno: Add dynamic-power-coefficient properties
ANDROID: arm, arm64: Enable kernel config options required for EAS
ANDROID: sched: Enable idle balance to pull single task towards cpu with higher capacity
ANDROID: sched: Prevent unnecessary active balance of single task in sched group
FROMLIST: sched/fair: Select an energy-efficient CPU on task wake-up
FROMLIST: sched/fair: Introduce an energy estimation helper function
FROMLIST: sched: Add over-utilization/tipping point indicator
FROMLIST: sched/fair: Clean-up update_sg_lb_stats parameters
FROMLIST: sched: Introduce a sysctl for Energy Aware Scheduling
FROMLIST: sched: Introduce sched_energy_present static key
FROMLIST: sched/topology: Make Energy Aware Scheduling depend on schedutil
FROMLIST: sched/topology: Disable EAS on inappropriate platforms
FROMLIST: sched/topology: Lowest CPU asymmetry sched_domain level pointer
FROMLIST: sched/topology: Reference the Energy Model of CPUs when available
FROMLIST: PM / EM: Expose the Energy Model in sysfs
FROMLIST: PM: Introduce an Energy Model management framework
FROMLIST: sched/cpufreq: Prepare schedutil for Energy Aware Scheduling
FROMLIST: sched: Relocate arch_scale_cpu_capacity
UPSTREAM: sched/core: Disable SD_PREFER_SIBLING on asymmetric CPU capacity domains
UPSTREAM: sched/fair: Don't move tasks to lower capacity CPUs unless necessary
UPSTREAM: sched/fair: Set rq->rd->overload when misfit
UPSTREAM: sched/fair: Wrap rq->rd->overload accesses with READ/WRITE_ONCE()
UPSTREAM: sched/core: Change root_domain->overload type to int
UPSTREAM: sched/fair: Change 'prefer_sibling' type to bool
UPSTREAM: sched/fair: Kick nohz balance if rq->misfit_task_load
UPSTREAM: sched/fair: Consider misfit tasks when load-balancing
UPSTREAM: sched/fair: Add sched_group per-CPU max capacity
UPSTREAM: sched/fair: Add 'group_misfit_task' load-balance type
UPSTREAM: sched/topology: Add static_key for asymmetric CPU capacity optimizations
UPSTREAM: sched/topology, arch/arm: Rebuild sched_domain hierarchy when CPU capacity changes
UPSTREAM: sched/topology, arch/arm64: Rebuild the sched_domain hierarchy when the CPU capacity changes
UPSTREAM: sched/topology, drivers/base/arch_topology: Rebuild the sched_domain hierarchy when capacities change
UPSTREAM: sched/topology: Add SD_ASYM_CPUCAPACITY flag detection
Change-Id: I19fafa34b3fd39c4125708cb5c9c5a7634c40ec4
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
Partial revert of 197df04c74 ("rename user_path_umountat() to
user_path_mountpoint_at()"), to restore access to vfs_path_lookup()
without including fs/internal.h, as needed by sdcardfs.
Bug: 120446149
Change-Id: I757f2df9f4dcc66f633939e7833e6fa2ac0ff4f8
Signed-off-by: Alistair Strachan <astrachan@google.com>
This allows filesystems to use their mount private data to
influence the permssions they return in permission2. It has
been separated into a new call to avoid disrupting current
permission users.
Bug: 35848445
Bug: 120446149
Change-Id: I9d416e3b8b6eca84ef3e336bd2af89ddd51df6ca
Signed-off-by: Daniel Rosenberg <drosen@google.com>
[AmitP: Minor refactoring of original patch to align with
changes from the following upstream commit
4bfd054ae1 ("fs: fold __inode_permission() into inode_permission()").
Also introduce vfs_mkobj2(), because do_create()
moved from using vfs_create() to vfs_mkobj()
eecec19d9e ("mqueue: switch to vfs_mkobj(), quit abusing ->d_fsdata")
do_create() is dropped/cleaned-up upstream so a
minor refactoring there as well.
066cc813e9 ("do_mq_open(): move all work prior to dentry_open() into a helper")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
[astrachan: Folded the following changes into this patch:
f46c9d62dd81 ("ANDROID: fs: Export vfs_rmdir2")
9992eb8b9a1e ("ANDROID: xattr: Pass EOPNOTSUPP to permission2")]
Signed-off-by: Alistair Strachan <astrachan@google.com>
This allows filesystems to use their mount private data to
influence the permssions they return in permission2. It has
been separated into a new call to avoid disrupting current
permission users.
Change-Id: I9d416e3b8b6eca84ef3e336bd2af89ddd51df6ca
Signed-off-by: Daniel Rosenberg <drosen@google.com>
[AmitP: Minor refactoring of original patch to align with
changes from the following upstream commit
4bfd054ae1 ("fs: fold __inode_permission() into inode_permission()").
Also introduce vfs_mkobj2(), because do_create()
moved from using vfs_create() to vfs_mkobj()
eecec19d9e ("mqueue: switch to vfs_mkobj(), quit abusing ->d_fsdata")
do_create() is dropped/cleaned up upstream so a
minor refactoring there as well.
066cc813e9 ("do_mq_open(): move all work prior to dentry_open() into a helper")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Alter the dynroot mount so that cells created by manipulation of
/proc/fs/afs/cells and /proc/fs/afs/rootcell and by specification of a root
cell as a module parameter will cause directories for those cells to be
created in the dynamic root superblock for the network namespace[*].
To this end:
(1) Only one dynamic root superblock is now created per network namespace
and this is shared between all attempts to mount it. This makes it
easier to find the superblock to modify.
(2) When a dynamic root superblock is created, the list of cells is walked
and directories created for each cell already defined.
(3) When a new cell is added, if a dynamic root superblock exists, a
directory is created for it.
(4) When a cell is destroyed, the directory is removed.
(5) These directories are created by calling lookup_one_len() on the root
dir which automatically creates them if they don't exist.
[*] Inasmuch as network namespaces are currently supported here.
Signed-off-by: David Howells <dhowells@redhat.com>
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
new flag: LOOKUP_DOWN. If the starting point is overmounted, cross
into whatever's mounted on top, triggering referrals et.al.
Use that instead of follow_down_one() loop in mntns_install(), handle
errors properly.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This reverts commit 3c9fe8cdff.
As Miklos points out in commit c1b2cc1a76, the "lookup_hash()" helper
is now unused, and in fact, with the hash salting changes, since the
hash of a dentry name now depends on the directory dentry it is in, the
helper function isn't even really likely to be useful.
So rather than keep it around in case somebody else might end up finding
a use for it, let's just remove the helper and not trick people into
thinking it might be a useful thing.
For example, I had obviously completely missed how the helper didn't
follow the normal dentry hashing patterns, and how the hash salting
patch broke overlayfs. Things would quietly build and look sane, but
not work.
Suggested-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The /dev/ptmx device node is changed to lookup the directory entry "pts"
in the same directory as the /dev/ptmx device node was opened in. If
there is a "pts" entry and that entry is a devpts filesystem /dev/ptmx
uses that filesystem. Otherwise the open of /dev/ptmx fails.
The DEVPTS_MULTIPLE_INSTANCES configuration option is removed, so that
userspace can now safely depend on each mount of devpts creating a new
instance of the filesystem.
Each mount of devpts is now a separate and equal filesystem.
Reserved ttys are now available to all instances of devpts where the
mounter is in the initial mount namespace.
A new vfs helper path_pts is introduced that finds a directory entry
named "pts" in the directory of the passed in path, and changes the
passed in path to point to it. The helper path_pts uses a function
path_parent_directory that was factored out of follow_dotdot.
In the implementation of devpts:
- devpts_mnt is killed as it is no longer meaningful if all mounts of
devpts are equal.
- pts_sb_from_inode is replaced by just inode->i_sb as all cached
inodes in the tty layer are now from the devpts filesystem.
- devpts_add_ref is rolled into the new function devpts_ptmx. And the
unnecessary inode hold is removed.
- devpts_del_ref is renamed devpts_release and reduced to just a
deacrivate_super.
- The newinstance mount option continues to be accepted but is now
ignored.
In devpts_fs.h definitions for when !CONFIG_UNIX98_PTYS are removed as
they are never used.
Documentation/filesystems/devices.txt is updated to describe the current
situation.
This has been verified to work properly on openwrt-15.05, centos5,
centos6, centos7, debian-6.0.2, debian-7.9, debian-8.2, ubuntu-14.04.3,
ubuntu-15.10, fedora23, magia-5, mint-17.3, opensuse-42.1,
slackware-14.1, gentoo-20151225 (13.0?), archlinux-2015-12-01. With the
caveat that on centos6 and on slackware-14.1 that there wind up being
two instances of the devpts filesystem mounted on /dev/pts, the lower
copy does not end up getting used.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg KH <greg@kroah.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Peter Anvin <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Serge Hallyn <serge.hallyn@ubuntu.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Cc: Jann Horn <jann@thejh.net>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Florian Weimer <fw@deneb.enyo.de>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Overlayfs needs lookup without inode_permission() and already has the name
hash (in form of dentry->d_name on overlayfs dentry). It also doesn't
support filesystems with d_op->d_hash() so basically it only needs
the actual hashed lookup from lookup_one_len_unlocked()
So add a new helper that does unlocked lookup of a hashed name.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
... and make mountpoint_last() use it. That makes all
candidates for lookup with parent locked shared go
through lookup_slow().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
We need information about exports when crossing mountpoints during
lookup or NFSv4 readdir. If we don't already have that information
cached, we may have to ask (and wait for) rpc.mountd.
In both cases we currently hold the i_mutex on the parent of the
directory we're asking rpc.mountd about. We've seen situations where
rpc.mountd performs some operation on that directory that tries to take
the i_mutex again, resulting in deadlock.
With some care, we may be able to avoid that in rpc.mountd. But it
seems better just to avoid holding a mutex while waiting on userspace.
It appears that lookup_one_len is pretty much the only operation that
needs the i_mutex. So we could just drop the i_mutex elsewhere and do
something like
mutex_lock()
lookup_one_len()
mutex_unlock()
In many cases though the lookup would have been cached and not required
the i_mutex, so it's more efficient to create a lookup_one_len() variant
that only takes the i_mutex when necessary.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
The only restriction is that on the total amount of symlinks
crossed; how they are nested does not matter
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
a) instead of storing the symlink body (via nd_set_link()) and returning
an opaque pointer later passed to ->put_link(), ->follow_link() _stores_
that opaque pointer (into void * passed by address by caller) and returns
the symlink body. Returning ERR_PTR() on error, NULL on jump (procfs magic
symlinks) and pointer to symlink body for normal symlinks. Stored pointer
is ignored in all cases except the last one.
Storing NULL for opaque pointer (or not storing it at all) means no call
of ->put_link().
b) the body used to be passed to ->put_link() implicitly (via nameidata).
Now only the opaque pointer is. In the cases when we used the symlink body
to free stuff, ->follow_link() now should store it as opaque pointer in addition
to returning it.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* RCU-delayed freeing of vfsmounts
* vfsmount_lock replaced with a seqlock (mount_lock)
* sequence number from mount_lock is stored in nameidata->m_seq and
used when we exit RCU mode
* new vfsmount flag - MNT_SYNC_UMOUNT. Set by umount_tree() when its
caller knows that vfsmount will have no surviving references.
* synchronize_rcu() done between unlocking namespace_sem in namespace_unlock()
and doing pending mntput().
* new helper: legitimize_mnt(mnt, seq). Checks the mount_lock sequence
number against seq, then grabs reference to mnt. Then it rechecks mount_lock
again to close the race and either returns success or drops the reference it
has acquired. The subtle point is that in case of MNT_SYNC_UMOUNT we can
simply decrement the refcount and sod off - aforementioned synchronize_rcu()
makes sure that final mntput() won't come until we leave RCU mode. We need
that, since we don't want to end up with some lazy pathwalk racing with
umount() and stealing the final mntput() from it - caller of umount() may
expect it to return only once the fs is shut down and we don't want to break
that. In other cases (i.e. with MNT_SYNC_UMOUNT absent) we have to do
full-blown mntput() in case of mount_lock sequence number mismatch happening
just as we'd grabbed the reference, but in those cases we won't be stealing
the final mntput() from anything that would care.
* mntput_no_expire() doesn't lock anything on the fast path now. Incidentally,
SMP and UP cases are handled the same way - no ifdefs there.
* normal pathname resolution does *not* do any writes to mount_lock. It does,
of course, bump the refcounts of vfsmount and dentry in the very end, but that's
it.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Christopher reported a regression where he was unable to unmount a NFS
filesystem where the root had gone stale. The problem is that
d_revalidate handles the root of the filesystem differently from other
dentries, but d_weak_revalidate does not. We could simply fix this by
making d_weak_revalidate return success on IS_ROOT dentries, but there
are cases where we do want to revalidate the root of the fs.
A umount is really a special case. We generally aren't interested in
anything but the dentry and vfsmount that's attached at that point. If
the inode turns out to be stale we just don't care since the intent is
to stop using it anyway.
Try to handle this situation better by treating umount as a special
case in the lookup code. Have it resolve the parent using normal
means, and then do a lookup of the final dentry without revalidating
it. In most cases, the final lookup will come out of the dcache, but
the case where there's a trailing symlink or !LAST_NORM entry on the
end complicates things a bit.
Cc: Neil Brown <neilb@suse.de>
Reported-by: Christopher T Vogan <cvogan@us.ibm.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This solves:
In file included from fs/ext3/symlink.c:20:0:
include/linux/namei.h: In function 'retry_estale':
include/linux/namei.h:114:19: error: 'ESTALE' undeclared (first use in this function)
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Where we can pass in LOOKUP_DIRECTORY or LOOKUP_REVAL. Any other flags
passed in here are currently ignored.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This function is expected to be called from path-based syscalls to help
them decide whether to try the lookup and call again in the event that
they got an -ESTALE return back on an earier try.
Currently, we only retry the call once on an ESTALE error, but in the
event that we decide that that's not enough in the future, we should be
able to change the logic in this helper without too much effort.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Add a helper that abstracts out the jump to an already parsed struct path
from ->follow_link operation from procfs. Not only does this clean up
the code by moving the two sides of this game into a single helper, but
it also prepares for making struct nameidata private to namei.c
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
all callers want the same thing, actually - a kinda-sorta analog of
kern_path_create(). I.e. they want parent vfsmount/dentry (with
->i_mutex held, to make sure the child dentry is still their child)
+ the child dentry.
Signed-off-by Al Viro <viro@zeniv.linux.org.uk>
All users of open intents have been converted to use ->atomic_{open,create}.
This patch gets rid of nd->intent.open and related infrastructure.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Since the commit below which added O_PATH support to the *at() calls, the
error return for readlink/readlinkat for the empty pathname has switched
from ENOENT to EINVAL:
commit 65cfc67223
Author: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun Mar 13 15:56:26 2011 -0400
readlinkat(), fchownat() and fstatat() with empty relative pathnames
This is both unexpected for userspace and makes readlink/readlinkat
inconsistant with all other interfaces; and inconsistant with our stated
return for these pathnames.
As the readlinkat call does not have a flags parameter we cannot use the
AT_EMPTY_PATH approach used in the other calls. Therefore expose whether
the original path is infact entry via a new user_path_at_empty() path
lookup function. Use this to determine whether to default to EINVAL or
ENOENT for failures.
Addresses http://bugs.launchpad.net/bugs/817187
[akpm@linux-foundation.org: remove unused getname_flags()]
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
That flag no longer makes sense, since we don't look up automount points
as eagerly any more. Additionally, it turns out that the NO_AUTOMOUNT
handling was buggy to begin with: it would avoid automounting even for
cases where we really *needed* to do the automount handling, and could
return ENOENT for autofs entries that hadn't been instantiated yet.
With our new non-eager automount semantics, one discussion has been
about adding a AT_AUTOMOUNT flag to vfs_fstatat (and thus the
newfstatat() and fstatat64() system calls), but it's probably not worth
it: you can always force at least directory automounting by simply
adding the final '/' to the filename, which works for *all* of the stat
family system calls, old and new.
So AT_NO_AUTOMOUNT (and thus LOOKUP_NO_AUTOMOUNT) really were just a
result of our bad default behavior.
Acked-by: Ian Kent <raven@themaw.net>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Since we've now turned around and made LOOKUP_FOLLOW *not* force an
automount, we want to add the ability to force an automount event on
lookup even if we don't happen to have one of the other flags that force
it implicitly (LOOKUP_OPEN, LOOKUP_DIRECTORY, LOOKUP_PARENT..)
Most cases will never want to use this, since you'd normally want to
delay automounting as long as possible, which usually implies
LOOKUP_OPEN (when we open a file or directory, we really cannot avoid
the automount any more).
But Trond argued sufficiently forcefully that at a minimum bind mounting
a file and quotactl will want to force the automount lookup. Some other
cases (like nfs_follow_remote_path()) could use it too, although
LOOKUP_DIRECTORY would work there as well.
This commit just adds the flag and logic, no users yet, though. It also
doesn't actually touch the LOOKUP_NO_AUTOMOUNT flag that is related, and
was made irrelevant by the same change that made us not follow on
LOOKUP_FOLLOW.
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Ian Kent <raven@themaw.net>
Cc: Jeff Layton <jlayton@redhat.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Greg KH <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
combination of kern_path_parent() and lookup_create(). Does *not*
expose struct nameidata to caller. Syscalls converted to that...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
For name_to_handle_at(2) we'll want both ...at()-style syscall that
would be usable for non-directory descriptors (with empty relative
pathname). Introduce new flag (AT_EMPTY_PATH) to deal with that and
corresponding LOOKUP_EMPTY; teach user_path_at() and path_init() to
deal with the latter.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
New lookup flag: LOOKUP_ROOT. nd->root is set (and held) by caller,
path_init() starts walking from that place and all pathname resolution
machinery never drops nd->root if that flag is set. That turns
vfs_path_lookup() into a special case of do_path_lookup() *and*
gets us down to 3 callers of link_path_walk(), making it finally
feasible to rip the handling of trailing symlink out of link_path_walk().
That will not only simply the living hell out of it, but make life
much simpler for unionfs merge. Trailing symlink handling will
become iterative, which is a good thing for stack footprint in
a lot of situations as well.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Don't stash the struct file * used as starting point of walk in nameidata;
pass file ** to path_init() instead.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
instead of ad-hackery around need_reval_dot(), do the following:
set a flag (LOOKUP_JUMPED) in the beginning of path, on absolute
symlink traversal, on ".." and on procfs-style symlinks. Clear on
normal components, leave unchanged on ".". Non-nested callers of
link_path_walk() call handle_reval_path(), which checks that flag
is set and that fs does want the final revalidate thing, then does
->d_revalidate(). In link_path_walk() all the return_reval stuff
is gone.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
all remaining callers pass LOOKUP_PARENT to it, so
flags argument can die; renamed to kern_path_parent()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Add an AT_NO_AUTOMOUNT flag to suppress terminal automounting of automount
point directories. This can be used by fstatat() users to permit the
gathering of attributes on an automount point and also prevent
mass-automounting of a directory of automount points by ls.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Add a dentry op (d_manage) to permit a filesystem to hold a process and make it
sleep when it tries to transit away from one of that filesystem's directories
during a pathwalk. The operation is keyed off a new dentry flag
(DCACHE_MANAGE_TRANSIT).
The filesystem is allowed to be selective about which processes it holds and
which it permits to continue on or prohibits from transiting from each flagged
directory. This will allow autofs to hold up client processes whilst letting
its userspace daemon through to maintain the directory or the stuff behind it
or mounted upon it.
The ->d_manage() dentry operation:
int (*d_manage)(struct path *path, bool mounting_here);
takes a pointer to the directory about to be transited away from and a flag
indicating whether the transit is undertaken by do_add_mount() or
do_move_mount() skipping through a pile of filesystems mounted on a mountpoint.
It should return 0 if successful and to let the process continue on its way;
-EISDIR to prohibit the caller from skipping to overmounted filesystems or
automounting, and to use this directory; or some other error code to return to
the user.
->d_manage() is called with namespace_sem writelocked if mounting_here is true
and no other locks held, so it may sleep. However, if mounting_here is true,
it may not initiate or wait for a mount or unmount upon the parameter
directory, even if the act is actually performed by userspace.
Within fs/namei.c, follow_managed() is extended to check with d_manage() first
on each managed directory, before transiting away from it or attempting to
automount upon it.
follow_down() is renamed follow_down_one() and should only be used where the
filesystem deliberately intends to avoid management steps (e.g. autofs).
A new follow_down() is added that incorporates the loop done by all other
callers of follow_down() (do_add/move_mount(), autofs and NFSD; whilst AFS, NFS
and CIFS do use it, their use is removed by converting them to use
d_automount()). The new follow_down() calls d_manage() as appropriate. It
also takes an extra parameter to indicate if it is being called from mount code
(with namespace_sem writelocked) which it passes to d_manage(). follow_down()
ignores automount points so that it can be used to mount on them.
__follow_mount_rcu() is made to abort rcu-walk mode if it hits a directory with
DCACHE_MANAGE_TRANSIT set on the basis that we're probably going to have to
sleep. It would be possible to enter d_manage() in rcu-walk mode too, and have
that determine whether to abort or not itself. That would allow the autofs
daemon to continue on in rcu-walk mode.
Note that DCACHE_MANAGE_TRANSIT on a directory should be cleared when it isn't
required as every tranist from that directory will cause d_manage() to be
invoked. It can always be set again when necessary.
==========================
WHAT THIS MEANS FOR AUTOFS
==========================
Autofs currently uses the lookup() inode op and the d_revalidate() dentry op to
trigger the automounting of indirect mounts, and both of these can be called
with i_mutex held.
autofs knows that the i_mutex will be held by the caller in lookup(), and so
can drop it before invoking the daemon - but this isn't so for d_revalidate(),
since the lock is only held on _some_ of the code paths that call it. This
means that autofs can't risk dropping i_mutex from its d_revalidate() function
before it calls the daemon.
The bug could manifest itself as, for example, a process that's trying to
validate an automount dentry that gets made to wait because that dentry is
expired and needs cleaning up:
mkdir S ffffffff8014e05a 0 32580 24956
Call Trace:
[<ffffffff885371fd>] :autofs4:autofs4_wait+0x674/0x897
[<ffffffff80127f7d>] avc_has_perm+0x46/0x58
[<ffffffff8009fdcf>] autoremove_wake_function+0x0/0x2e
[<ffffffff88537be6>] :autofs4:autofs4_expire_wait+0x41/0x6b
[<ffffffff88535cfc>] :autofs4:autofs4_revalidate+0x91/0x149
[<ffffffff80036d96>] __lookup_hash+0xa0/0x12f
[<ffffffff80057a2f>] lookup_create+0x46/0x80
[<ffffffff800e6e31>] sys_mkdirat+0x56/0xe4
versus the automount daemon which wants to remove that dentry, but can't
because the normal process is holding the i_mutex lock:
automount D ffffffff8014e05a 0 32581 1 32561
Call Trace:
[<ffffffff80063c3f>] __mutex_lock_slowpath+0x60/0x9b
[<ffffffff8000ccf1>] do_path_lookup+0x2ca/0x2f1
[<ffffffff80063c89>] .text.lock.mutex+0xf/0x14
[<ffffffff800e6d55>] do_rmdir+0x77/0xde
[<ffffffff8005d229>] tracesys+0x71/0xe0
[<ffffffff8005d28d>] tracesys+0xd5/0xe0
which means that the system is deadlocked.
This patch allows autofs to hold up normal processes whilst the daemon goes
ahead and does things to the dentry tree behind the automouter point without
risking a deadlock as almost no locks are held in d_manage() and none in
d_automount().
Signed-off-by: David Howells <dhowells@redhat.com>
Was-Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Perform common cases of path lookups without any stores or locking in the
ancestor dentry elements. This is called rcu-walk, as opposed to the current
algorithm which is a refcount based walk, or ref-walk.
This results in far fewer atomic operations on every path element,
significantly improving path lookup performance. It also avoids cacheline
bouncing on common dentries, significantly improving scalability.
The overall design is like this:
* LOOKUP_RCU is set in nd->flags, which distinguishes rcu-walk from ref-walk.
* Take the RCU lock for the entire path walk, starting with the acquiring
of the starting path (eg. root/cwd/fd-path). So now dentry refcounts are
not required for dentry persistence.
* synchronize_rcu is called when unregistering a filesystem, so we can
access d_ops and i_ops during rcu-walk.
* Similarly take the vfsmount lock for the entire path walk. So now mnt
refcounts are not required for persistence. Also we are free to perform mount
lookups, and to assume dentry mount points and mount roots are stable up and
down the path.
* Have a per-dentry seqlock to protect the dentry name, parent, and inode,
so we can load this tuple atomically, and also check whether any of its
members have changed.
* Dentry lookups (based on parent, candidate string tuple) recheck the parent
sequence after the child is found in case anything changed in the parent
during the path walk.
* inode is also RCU protected so we can load d_inode and use the inode for
limited things.
* i_mode, i_uid, i_gid can be tested for exec permissions during path walk.
* i_op can be loaded.
When we reach the destination dentry, we lock it, recheck lookup sequence,
and increment its refcount and mountpoint refcount. RCU and vfsmount locks
are dropped. This is termed "dropping rcu-walk". If the dentry refcount does
not match, we can not drop rcu-walk gracefully at the current point in the
lokup, so instead return -ECHILD (for want of a better errno). This signals the
path walking code to re-do the entire lookup with a ref-walk.
Aside from the final dentry, there are other situations that may be encounted
where we cannot continue rcu-walk. In that case, we drop rcu-walk (ie. take
a reference on the last good dentry) and continue with a ref-walk. Again, if
we can drop rcu-walk gracefully, we return -ECHILD and do the whole lookup
using ref-walk. But it is very important that we can continue with ref-walk
for most cases, particularly to avoid the overhead of double lookups, and to
gain the scalability advantages on common path elements (like cwd and root).
The cases where rcu-walk cannot continue are:
* NULL dentry (ie. any uncached path element)
* parent with d_inode->i_op->permission or ACLs
* dentries with d_revalidate
* Following links
In future patches, permission checks and d_revalidate become rcu-walk aware. It
may be possible eventually to make following links rcu-walk aware.
Uncached path elements will always require dropping to ref-walk mode, at the
very least because i_mutex needs to be grabbed, and objects allocated.
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Just set f_flags when shoving struct file into nameidata; don't
postpone that until __dentry_open(). do_filp_open() has correct
value; lookup_instantiate_filp() doesn't - we lose the difference
between O_RDWR and 3 by that point.
We still set .intent.open.flags, so no fs code needs to be changed.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
By teaching sysfs_revalidate to hide a dentry for
a sysfs_dirent if the sysfs_dirent has been renamed,
and by teaching sysfs_lookup to return the original
dentry if the sysfs dirent has been renamed. I can
show the results of renames correctly without having to
update the dcache during the directory rename.
This massively simplifies the rename logic allowing a lot
of weird sysfs special cases to be removed along with
a lot of now unnecesary helper code.
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
