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Commit 79bbe9c8 authored by jianzhou's avatar jianzhou
Browse files

Merge android-4.9.187 (fabc071c) into msm-4.9



* refs/heads/tmp-fabc071c:
  Linux 4.9.187
  ceph: hold i_ceph_lock when removing caps for freeing inode
  drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl
  sched/fair: Don't free p->numa_faults with concurrent readers
  Bluetooth: hci_uart: check for missing tty operations
  media: radio-raremono: change devm_k*alloc to k*alloc
  media: cpia2_usb: first wake up, then free in disconnect
  media: au0828: fix null dereference in error path
  ISDN: hfcsusb: checking idx of ep configuration
  arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ
  i2c: qup: fixed releasing dma without flush operation completion
  arm64: dts: marvell: Fix A37xx UART0 register size
  tcp: reset sk_send_head in tcp_write_queue_purge
  ipv6: check sk sk_type and protocol early in ip_mroute_set/getsockopt
  access: avoid the RCU grace period for the temporary subjective credentials
  powerpc/tm: Fix oops on sigreturn on systems without TM
  ALSA: hda - Add a conexant codec entry to let mute led work
  ALSA: line6: Fix wrong altsetting for LINE6_PODHD500_1
  hpet: Fix division by zero in hpet_time_div()
  x86/speculation/mds: Apply more accurate check on hypervisor platform
  x86/sysfb_efi: Add quirks for some devices with swapped width and height
  usb: pci-quirks: Correct AMD PLL quirk detection
  usb: wusbcore: fix unbalanced get/put cluster_id
  locking/lockdep: Hide unused 'class' variable
  locking/lockdep: Fix lock used or unused stats error
  mm/mmu_notifier: use hlist_add_head_rcu()
  9p: pass the correct prototype to read_cache_page
  mm/kmemleak.c: fix check for softirq context
  sh: prevent warnings when using iounmap
  powerpc/eeh: Handle hugepages in ioremap space
  mailbox: handle failed named mailbox channel request
  f2fs: avoid out-of-range memory access
  powerpc/boot: add {get, put}_unaligned_be32 to xz_config.h
  RDMA/rxe: Fill in wc byte_len with IB_WC_RECV_RDMA_WITH_IMM
  perf test mmap-thread-lookup: Initialize variable to suppress memory sanitizer warning
  kallsyms: exclude kasan local symbols on s390
  serial: sh-sci: Fix TX DMA buffer flushing and workqueue races
  serial: sh-sci: Terminate TX DMA during buffer flushing
  RDMA/i40iw: Set queue pair state when being queried
  powerpc/4xx/uic: clear pending interrupt after irq type/pol change
  um: Silence lockdep complaint about mmap_sem
  mfd: hi655x-pmic: Fix missing return value check for devm_regmap_init_mmio_clk
  mfd: arizona: Fix undefined behavior
  mfd: core: Set fwnode for created devices
  recordmcount: Fix spurious mcount entries on powerpc
  iio: iio-utils: Fix possible incorrect mask calculation
  PCI: xilinx-nwl: Fix Multi MSI data programming
  kbuild: Add -Werror=unknown-warning-option to CLANG_FLAGS
  PCI: sysfs: Ignore lockdep for remove attribute
  powerpc/pci/of: Fix OF flags parsing for 64bit BARs
  usb: gadget: Zero ffs_io_data
  tty: serial_core: Set port active bit in uart_port_activate
  drm/rockchip: Properly adjust to a true clock in adjusted_mode
  phy: renesas: rcar-gen2: Fix memory leak at error paths
  drm/virtio: Add memory barriers for capset cache.
  serial: 8250: Fix TX interrupt handling condition
  tty: serial: msm_serial: avoid system lockup condition
  tty/serial: digicolor: Fix digicolor-usart already registered warning
  memstick: Fix error cleanup path of memstick_init
  drm/bridge: sii902x: pixel clock unit is 10kHz instead of 1kHz
  drm/bridge: tc358767: read display_props in get_modes()
  tty: serial: cpm_uart - fix init when SMC is relocated
  pinctrl: rockchip: fix leaked of_node references
  tty: max310x: Fix invalid baudrate divisors calculator
  usb: core: hub: Disable hub-initiated U1/U2
  drm/panel: simple: Fix panel_simple_dsi_probe
  nfsd: Fix overflow causing non-working mounts on 1 TB machines
  nfsd: fix performance-limiting session calculation
  nfsd: give out fewer session slots as limit approaches
  nfsd: increase DRC cache limit
  NFSv4: Fix open create exclusive when the server reboots
  perf/events/amd/uncore: Fix amd_uncore_llc ID to use pre-defined cpu_llc_id
  perf/x86/amd/uncore: Get correct number of cores sharing last level cache
  perf/x86/amd/uncore: Rename 'L2' to 'LLC'
  net: bridge: stp: don't cache eth dest pointer before skb pull
  net: bridge: mcast: fix stale ipv6 hdr pointer when handling v6 query
  net: bridge: mcast: fix stale nsrcs pointer in igmp3/mld2 report handling
  tcp: Reset bytes_acked and bytes_received when disconnecting
  bonding: validate ip header before check IPPROTO_IGMP
  netrom: hold sock when setting skb->destructor
  netrom: fix a memory leak in nr_rx_frame()
  macsec: fix checksumming after decryption
  macsec: fix use-after-free of skb during RX
  vrf: make sure skb->data contains ip header to make routing
  sky2: Disable MSI on ASUS P6T
  rxrpc: Fix send on a connected, but unbound socket
  nfc: fix potential illegal memory access
  net: openvswitch: fix csum updates for MPLS actions
  net: neigh: fix multiple neigh timer scheduling
  net: dsa: mv88e6xxx: wait after reset deactivation
  net: bcmgenet: use promisc for unsupported filters
  ipv4: don't set IPv6 only flags to IPv4 addresses
  igmp: fix memory leak in igmpv3_del_delrec()
  caif-hsi: fix possible deadlock in cfhsi_exit_module()
  bnx2x: Prevent ptp_task to be rescheduled indefinitely
  bnx2x: Prevent load reordering in tx completion processing
  ext4: allow directory holes
  lib/strscpy: Shut up KASAN false-positives in strscpy()
  compiler.h: Add read_word_at_a_time() function.
  compiler.h, kasan: Avoid duplicating __read_once_size_nocheck()
  dm bufio: fix deadlock with loop device
  usb: Handle USB3 remote wakeup for LPM enabled devices correctly
  Bluetooth: Add SMP workaround Microsoft Surface Precision Mouse bug
  intel_th: msu: Fix single mode with disabled IOMMU
  eCryptfs: fix a couple type promotion bugs
  powerpc/watchpoint: Restore NV GPRs while returning from exception
  powerpc/32s: fix suspend/resume when IBATs 4-7 are used
  parisc: Fix kernel panic due invalid values in IAOQ0 or IAOQ1
  parisc: Ensure userspace privilege for ptraced processes in regset functions
  um: Fix FP register size for XSTATE/XSAVE
  um: Allow building and running on older hosts
  crypto: caam - limit output IV to CBC to work around CTR mode DMA issue
  PCI: hv: Fix a use-after-free bug in hv_eject_device_work()
  PCI: hv: Delete the device earlier from hbus->children for hot-remove
  crypto: ccp - Validate the the error value used to index error messages
  gpu: ipu-v3: ipu-ic: Fix saturation bit offset in TPMEM
  coda: pass the host file in vma->vm_file on mmap
  floppy: fix out-of-bounds read in copy_buffer
  floppy: fix invalid pointer dereference in drive_name
  floppy: fix out-of-bounds read in next_valid_format
  floppy: fix div-by-zero in setup_format_params
  take floppy compat ioctls to sodding floppy.c
  libnvdimm/pfn: fix fsdax-mode namespace info-block zero-fields
  Btrfs: add missing inode version, ctime and mtime updates when punching hole
  PCI: Do not poll for PME if the device is in D3cold
  9p/virtio: Add cleanup path in p9_virtio_init
  padata: use smp_mb in padata_reorder to avoid orphaned padata jobs
  drm/nouveau/i2c: Enable i2c pads & busses during preinit
  fs/proc/proc_sysctl.c: fix the default values of i_uid/i_gid on /proc/sys inodes.
  arm64: tegra: Fix AGIC register range
  KVM: x86/vPMU: refine kvm_pmu err msg when event creation failed
  media: coda: Remove unbalanced and unneeded mutex unlock
  media: v4l2: Test type instead of cfg->type in v4l2_ctrl_new_custom()
  ALSA: hda/realtek: apply ALC891 headset fixup to one Dell machine
  ALSA: seq: Break too long mutex context in the write loop
  lib/scatterlist: Fix mapping iterator when sg->offset is greater than PAGE_SIZE
  NFSv4: Handle the special Linux file open access mode
  tracing/snapshot: Resize spare buffer if size changed
  iwlwifi: pcie: don't service an interrupt that was masked
  arm64: tegra: Update Jetson TX1 GPU regulator timings
  regulator: s2mps11: Fix buck7 and buck8 wrong voltages
  Input: gtco - bounds check collection indent level
  crypto: crypto4xx - fix a potential double free in ppc4xx_trng_probe
  crypto: chacha20poly1305 - fix atomic sleep when using async algorithm
  crypto: arm64/sha2-ce - correct digest for empty data in finup
  crypto: arm64/sha1-ce - correct digest for empty data in finup
  crypto: ghash - fix unaligned memory access in ghash_setkey()
  scsi: mac_scsi: Increase PIO/PDMA transfer length threshold
  scsi: NCR5380: Always re-enable reselection interrupt
  scsi: NCR5380: Reduce goto statements in NCR5380_select()
  xen: let alloc_xenballooned_pages() fail if not enough memory free
  gtp: fix use-after-free in gtp_newlink()
  gtp: fix Illegal context switch in RCU read-side critical section.
  Bluetooth: validate BLE connection interval updates
  Bluetooth: Check state in l2cap_disconnect_rsp
  Bluetooth: 6lowpan: search for destination address in all peers
  Bluetooth: hci_bcsp: Fix memory leak in rx_skb
  gpiolib: Fix references to gpiod_[gs]et_*value_cansleep() variants
  net: usb: asix: init MAC address buffers
  iwlwifi: mvm: Drop large non sta frames
  bcache: check c->gc_thread by IS_ERR_OR_NULL in cache_set_flush()
  EDAC: Fix global-out-of-bounds write when setting edac_mc_poll_msec
  crypto: asymmetric_keys - select CRYPTO_HASH where needed
  ixgbe: Check DDM existence in transceiver before access
  rslib: Fix handling of of caller provided syndrome
  rslib: Fix decoding of shortened codes
  clocksource/drivers/exynos_mct: Increase priority over ARM arch timer
  libata: don't request sense data on !ZAC ATA devices
  perf tools: Increase MAX_NR_CPUS and MAX_CACHES
  ath10k: fix PCIE device wake up failed
  mt7601u: fix possible memory leak when the device is disconnected
  x86/build: Add 'set -e' to mkcapflags.sh to delete broken capflags.c
  mt7601u: do not schedule rx_tasklet when the device has been disconnected
  media: coda: increment sequence offset for the last returned frame
  media: coda: fix mpeg2 sequence number handling
  acpi/arm64: ignore 5.1 FADTs that are reported as 5.0
  timer_list: Guard procfs specific code
  ntp: Limit TAI-UTC offset
  media: i2c: fix warning same module names
  ipsec: select crypto ciphers for xfrm_algo
  EDAC/sysfs: Fix memory leak when creating a csrow object
  ipoib: correcly show a VF hardware address
  vhost_net: disable zerocopy by default
  perf evsel: Make perf_evsel__name() accept a NULL argument
  xfrm: fix sa selector validation
  blkcg, writeback: dead memcgs shouldn't contribute to writeback ownership arbitration
  rcu: Force inlining of rcu_read_lock()
  bpf: silence warning messages in core
  regmap: fix bulk writes on paged registers
  gpio: omap: ensure irq is enabled before wakeup
  gpio: omap: fix lack of irqstatus_raw0 for OMAP4
  perf test 6: Fix missing kvm module load for s390
  perf cs-etm: Properly set the value of 'old' and 'head' in snapshot mode
  s390/qdio: handle PENDING state for QEBSM devices
  net: axienet: Fix race condition causing TX hang
  net: fec: Do not use netdev messages too early
  cpupower : frequency-set -r option misses the last cpu in related cpu list
  media: wl128x: Fix some error handling in fm_v4l2_init_video_device()
  locking/lockdep: Fix merging of hlocks with non-zero references
  tua6100: Avoid build warnings.
  crypto: talitos - Align SEC1 accesses to 32 bits boundaries.
  crypto: talitos - properly handle split ICV.
  net: phy: Check against net_device being NULL
  media: staging: media: davinci_vpfe: - Fix for memory leak if decoder initialization fails.
  media: mc-device.c: don't memset __user pointer contents
  xfrm: Fix xfrm sel prefix length validation
  af_key: fix leaks in key_pol_get_resp and dump_sp.
  signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig
  net: stmmac: dwmac4/5: Clear unused address entries
  net: stmmac: dwmac1000: Clear unused address entries
  media: media_device_enum_links32: clean a reserved field
  media: vpss: fix a potential NULL pointer dereference
  media: marvell-ccic: fix DMA s/g desc number calculation
  crypto: talitos - fix skcipher failure due to wrong output IV
  media: dvb: usb: fix use after free in dvb_usb_device_exit
  batman-adv: fix for leaked TVLV handler.
  ath: DFS JP domain W56 fixed pulse type 3 RADAR detection
  ath6kl: add some bounds checking
  ath9k: Check for errors when reading SREV register
  ath10k: Do not send probe response template for mesh
  dmaengine: imx-sdma: fix use-after-free on probe error path
  arm64/efi: Mark __efistub_stext_offset as an absolute symbol explicitly
  MIPS: fix build on non-linux hosts
  MIPS: ath79: fix ar933x uart parity mode
  ext4: remove unused value
  f2fs: use EINVAL for superblock with invalid magic
  f2fs: fix to read source block before invalidating it
  f2fs: remove redundant check from f2fs_setflags_common()
  f2fs: use generic checking and prep function for FS_IOC_SETFLAGS
  vfs: use READ_ONCE() to access ->i_link
  fs, fscrypt: clear DCACHE_ENCRYPTED_NAME when unaliasing directory
  ANDROID: enable CONFIG_RTC_DRV_TEST on cuttlefish
  ANDROID: xfrm: remove in_compat_syscall() checks
  UPSTREAM: binder: Set end of SG buffer area properly.
  fscrypt: cache decrypted symlink target in ->i_link
  fscrypt: fix race where ->lookup() marks plaintext dentry as ciphertext
  ext4: remove unused d_name argument from ext4_search_dir() et al.
  fscrypt: only set dentry_operations on ciphertext dentries
  fscrypt: fix race allowing rename() and link() of ciphertext dentries
  fscrypt: clean up and improve dentry revalidation
  fscrypt: use READ_ONCE() to access ->i_crypt_info
  fscrypt: remove WARN_ON_ONCE() when decryption fails
  fscrypt: drop inode argument from fscrypt_get_ctx()
  f2fs: improve print log in f2fs_sanity_check_ckpt()
  f2fs: avoid out-of-range memory access
  f2fs: fix to avoid long latency during umount
  f2fs: allow all the users to pin a file
  f2fs: support swap file w/ DIO
  f2fs: allocate blocks for pinned file
  f2fs: fix is_idle() check for discard type
  f2fs: add a rw_sem to cover quota flag changes
  f2fs: set SBI_NEED_FSCK for xattr corruption case
  f2fs: use generic EFSBADCRC/EFSCORRUPTED
  f2fs: Use DIV_ROUND_UP() instead of open-coding
  f2fs: print kernel message if filesystem is inconsistent
  f2fs: introduce f2fs_<level> macros to wrap f2fs_printk()
  f2fs: avoid get_valid_blocks() for cleanup
  f2fs: ioctl for removing a range from F2FS
  f2fs: only set project inherit bit for directory
  f2fs: separate f2fs i_flags from fs_flags and ext4 i_flags
  f2fs: Add option to limit required GC for checkpoint=disable
  f2fs: Fix accounting for unusable blocks
  f2fs: Fix root reserved on remount
  f2fs: Lower threshold for disable_cp_again
  f2fs: fix sparse warning
  f2fs: fix f2fs_show_options to show nodiscard mount option
  f2fs: add error prints for debugging mount failure
  f2fs: fix to do sanity check on segment bitmap of LFS curseg
  f2fs: add missing sysfs entries in documentation
  f2fs: fix to avoid deadloop if data_flush is on
  f2fs: always assume that the device is idle under gc_urgent
  f2fs: add bio cache for IPU
  f2fs: allow ssr block allocation during checkpoint=disable period
  f2fs: fix to check layout on last valid checkpoint park

Conflicts:
	drivers/tty/serial/msm_serial.c
	fs/crypto/bio.c
	fs/crypto/keyinfo.c
	fs/f2fs/data.c

Change-Id: I400b66ca62d751839b3e0499cb6c797f5f70b554
Signed-off-by: default avatarjianzhou <jianzhou@codeaurora.org>
parents e2410303 fabc071c
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+8 −0
Original line number Diff line number Diff line
@@ -243,3 +243,11 @@ Description:
		 - Del: echo '[h/c]!extension' > /sys/fs/f2fs/<disk>/extension_list
		 - [h] means add/del hot file extension
		 - [c] means add/del cold file extension

What:		/sys/fs/f2fs/<disk>/unusable
Date		April 2019
Contact:	"Daniel Rosenberg" <drosen@google.com>
Description:
		If checkpoint=disable, it displays the number of blocks that are unusable.
                If checkpoint=enable it displays the enumber of blocks that would be unusable
                if checkpoint=disable were to be set.
+1 −1
Original line number Diff line number Diff line
@@ -8,6 +8,6 @@ Required properties:
Example:
	serial@12000 {
		compatible = "marvell,armada-3700-uart";
		reg = <0x12000 0x400>;
		reg = <0x12000 0x200>;
		interrupts = <43>;
	};
+123 −10
Original line number Diff line number Diff line
@@ -214,11 +214,22 @@ fsync_mode=%s Control the policy of fsync. Currently supports "posix",
                       non-atomic files likewise "nobarrier" mount option.
test_dummy_encryption  Enable dummy encryption, which provides a fake fscrypt
                       context. The fake fscrypt context is used by xfstests.
checkpoint=%s          Set to "disable" to turn off checkpointing. Set to "enable"
checkpoint=%s[:%u[%]]     Set to "disable" to turn off checkpointing. Set to "enable"
                       to reenable checkpointing. Is enabled by default. While
                       disabled, any unmounting or unexpected shutdowns will cause
                       the filesystem contents to appear as they did when the
                       filesystem was mounted with that option.
                       While mounting with checkpoint=disabled, the filesystem must
                       run garbage collection to ensure that all available space can
                       be used. If this takes too much time, the mount may return
                       EAGAIN. You may optionally add a value to indicate how much
                       of the disk you would be willing to temporarily give up to
                       avoid additional garbage collection. This can be given as a
                       number of blocks, or as a percent. For instance, mounting
                       with checkpoint=disable:100% would always succeed, but it may
                       hide up to all remaining free space. The actual space that
                       would be unusable can be viewed at /sys/fs/f2fs/<disk>/unusable
                       This space is reclaimed once checkpoint=enable.

================================================================================
DEBUGFS ENTRIES
@@ -246,11 +257,14 @@ Files in /sys/fs/f2fs/<devname>
..............................................................................
 File                         Content

 gc_max_sleep_time            This tuning parameter controls the maximum sleep
 gc_urgent_sleep_time         This parameter controls sleep time for gc_urgent.
                              500 ms is set by default. See above gc_urgent.

 gc_min_sleep_time            This tuning parameter controls the minimum sleep
                              time for the garbage collection thread. Time is
                              in milliseconds.

 gc_min_sleep_time            This tuning parameter controls the minimum sleep
 gc_max_sleep_time            This tuning parameter controls the maximum sleep
                              time for the garbage collection thread. Time is
                              in milliseconds.

@@ -270,9 +284,6 @@ Files in /sys/fs/f2fs/<devname>
                              to 1, background thread starts to do GC by given
                              gc_urgent_sleep_time interval.

 gc_urgent_sleep_time         This parameter controls sleep time for gc_urgent.
                              500 ms is set by default. See above gc_urgent.

 reclaim_segments             This parameter controls the number of prefree
                              segments to be reclaimed. If the number of prefree
			      segments is larger than the number of segments
@@ -287,7 +298,16 @@ Files in /sys/fs/f2fs/<devname>
			      checkpoint is triggered, and issued during the
			      checkpoint. By default, it is disabled with 0.

 trim_sections                This parameter controls the number of sections
 discard_granularity	      This parameter controls the granularity of discard
			      command size. It will issue discard commands iif
			      the size is larger than given granularity. Its
			      unit size is 4KB, and 4 (=16KB) is set by default.
			      The maximum value is 128 (=512KB).

 reserved_blocks	      This parameter indicates the number of blocks that
			      f2fs reserves internally for root.

 batched_trim_sections	      This parameter controls the number of sections
                              to be trimmed out in batch mode when FITRIM
                              conducts. 32 sections is set by default.

@@ -309,11 +329,35 @@ Files in /sys/fs/f2fs/<devname>
			      the number is less than this value, it triggers
			      in-place-updates.

 min_seq_blocks		      This parameter controls the threshold to serialize
			      write IOs issued by multiple threads in parallel.

 min_hot_blocks		      This parameter controls the threshold to allocate
			      a hot data log for pending data blocks to write.

 min_ssr_sections	      This parameter adds the threshold when deciding
			      SSR block allocation. If this is large, SSR mode
			      will be enabled early.

 ram_thresh                   This parameter controls the memory footprint used
			      by free nids and cached nat entries. By default,
			      10 is set, which indicates 10 MB / 1 GB RAM.

 ra_nid_pages		      When building free nids, F2FS reads NAT blocks
			      ahead for speed up. Default is 0.

 dirty_nats_ratio	      Given dirty ratio of cached nat entries, F2FS
			      determines flushing them in background.

 max_victim_search	      This parameter controls the number of trials to
			      find a victim segment when conducting SSR and
			      cleaning operations. The default value is 4096
			      which covers 8GB block address range.

 migration_granularity	      For large-sized sections, F2FS can stop GC given
			      this granularity instead of reclaiming entire
			      section.

 dir_level                    This parameter controls the directory level to
			      support large directory. If a directory has a
			      number of files, it can reduce the file lookup
@@ -321,9 +365,53 @@ Files in /sys/fs/f2fs/<devname>
			      Otherwise, it needs to decrease this value to
			      reduce the space overhead. The default value is 0.

 ram_thresh                   This parameter controls the memory footprint used
			      by free nids and cached nat entries. By default,
			      10 is set, which indicates 10 MB / 1 GB RAM.
 cp_interval		      F2FS tries to do checkpoint periodically, 60 secs
			      by default.

 idle_interval		      F2FS detects system is idle, if there's no F2FS
			      operations during given interval, 5 secs by
			      default.

 discard_idle_interval	      F2FS detects the discard thread is idle, given
			      time interval. Default is 5 secs.

 gc_idle_interval	      F2FS detects the GC thread is idle, given time
			      interval. Default is 5 secs.

 umount_discard_timeout       When unmounting the disk, F2FS waits for finishing
			      queued discard commands which can take huge time.
			      This gives time out for it, 5 secs by default.

 iostat_enable		      This controls to enable/disable iostat in F2FS.

 readdir_ra		      This enables/disabled readahead of inode blocks
			      in readdir, and default is enabled.

 gc_pin_file_thresh	      This indicates how many GC can be failed for the
			      pinned file. If it exceeds this, F2FS doesn't
			      guarantee its pinning state. 2048 trials is set
			      by default.

 extension_list		      This enables to change extension_list for hot/cold
			      files in runtime.

 inject_rate		      This controls injection rate of arbitrary faults.

 inject_type		      This controls injection type of arbitrary faults.

 dirty_segments 	      This shows # of dirty segments.

 lifetime_write_kbytes	      This shows # of data written to the disk.

 features		      This shows current features enabled on F2FS.

 current_reserved_blocks      This shows # of blocks currently reserved.

 unusable                     If checkpoint=disable, this shows the number of
                              blocks that are unusable.
                              If checkpoint=enable it shows the number of blocks
                              that would be unusable if checkpoint=disable were
                              to be set.

================================================================================
USAGE
@@ -656,3 +744,28 @@ algorithm.
In order to identify whether the data in the victim segment are valid or not,
F2FS manages a bitmap. Each bit represents the validity of a block, and the
bitmap is composed of a bit stream covering whole blocks in main area.

Fallocate(2) Policy
-------------------

The default policy follows the below posix rule.

Allocating disk space
    The default operation (i.e., mode is zero) of fallocate() allocates
    the disk space within the range specified by offset and len.  The
    file size (as reported by stat(2)) will be changed if offset+len is
    greater than the file size.  Any subregion within the range specified
    by offset and len that did not contain data before the call will be
    initialized to zero.  This default behavior closely resembles the
    behavior of the posix_fallocate(3) library function, and is intended
    as a method of optimally implementing that function.

However, once F2FS receives ioctl(fd, F2FS_IOC_SET_PIN_FILE) in prior to
fallocate(fd, DEFAULT_MODE), it allocates on-disk blocks addressess having
zero or random data, which is useful to the below scenario where:
 1. create(fd)
 2. ioctl(fd, F2FS_IOC_SET_PIN_FILE)
 3. fallocate(fd, 0, 0, size)
 4. address = fibmap(fd, offset)
 5. open(blkdev)
 6. write(blkdev, address)
+2 −1
Original line number Diff line number Diff line
VERSION = 4
PATCHLEVEL = 9
SUBLEVEL = 186
SUBLEVEL = 187
EXTRAVERSION =
NAME = Roaring Lionus

@@ -540,6 +540,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
CLANG_FLAGS	+= -no-integrated-as
CLANG_FLAGS	+= -Werror=unknown-warning-option
KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
else
+1 −1
Original line number Diff line number Diff line
@@ -96,7 +96,7 @@

			uart0: serial@12000 {
				compatible = "marvell,armada-3700-uart";
				reg = <0x12000 0x400>;
				reg = <0x12000 0x200>;
				interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
				status = "disabled";
			};
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