Merge google common f2fs changes from 'android-3.18' into msm-3.18.c10

* quic/tmp-b0a18eac:
  f2fs: updates on 4.15-rc1
  FROMLIST: f2fs: expose some sectors to user in inline data or dentry case
  UPSTREAM: f2fs: fix potential panic during fstrim
  ANDROID: f2fs: correct inconsistent cherry-pick
  f2fs: add lazytime mount option
  vfs: add support for a lazytime mount option
  f2fs: hurry up to issue discard after io interruption
  f2fs: fix to show correct discard_granularity in sysfs
  f2fs: detect dirty inode in evict_inode
  f2fs: clear radix tree dirty tag of pages whose dirty flag is cleared
  f2fs: speed up gc_urgent mode with SSR
  f2fs: better to wait for fstrim completion
  f2fs: avoid race in between read xattr & write xattr
  f2fs: make get_lock_data_page to handle encrypted inode
  f2fs: use generic terms used for encrypted block management
  f2fs: introduce f2fs_encrypted_file for clean-up
  Revert "f2fs: add a new function get_ssr_cost"
  f2fs: constify super_operations
  f2fs: fix to wake up all sleeping flusher
  f2fs: avoid race in between atomic_read & atomic_inc
  f2fs: remove unneeded parameter of change_curseg
  f2fs: update i_flags correctly
  f2fs: don't check inode's checksum if it was dirtied or writebacked
  f2fs: don't need to update inode checksum for recovery
  f2fs: trigger fdatasync for non-atomic_write file
  f2fs: fix to avoid race in between aio and gc
  f2fs: wake up discard_thread iff there is a candidate
  f2fs: return error when accessing insane flie offset
  f2fs: trigger normal fsync for non-atomic_write file
  f2fs: clear FI_HOT_DATA correctly
  f2fs: fix out-of-order execution in f2fs_issue_flush
  f2fs: issue discard commands if gc_urgent is set
  f2fs: remove unused function overprovision_sections
  f2fs: check hot_data for roll-forward recovery
  f2fs: add tracepoint for f2fs_gc
  f2fs: retry to revoke atomic commit in -ENOMEM case
  f2fs: let fill_super handle roll-forward errors
  f2fs: merge equivalent flags F2FS_GET_BLOCK_[READ|DIO]
  f2fs: support journalled quota
  f2fs: fix potential overflow when adjusting GC cycle
  f2fs: avoid unneeded sync on quota file
  f2fs: introduce gc_urgent mode for background GC
  f2fs: fix the size value in __check_sit_bitmap
  f2fs: add app/fs io stat
  f2fs: do not change the valid_block value if cur_valid_map was wrongly set or cleared
  f2fs: update cur_valid_map_mir together with cur_valid_map
  f2fs: use printk_ratelimited for f2fs_msg
  f2fs: expose features to sysfs entry
  f2fs: support inode checksum
  f2fs: return wrong error number on f2fs_quota_write
  f2fs: provide f2fs_balance_fs to __write_node_page
  f2fs: introduce f2fs_statfs_project
  f2fs: don't need to wait for node writes for atomic write
  f2fs: avoid naming confusion of sysfs init
  f2fs: support project quota
  f2fs: record quota during dot{,dot} recovery
  f2fs: enhance on-disk inode structure scalability
  f2fs: make max inline size changeable
  f2fs: preserve i_mode if __f2fs_set_acl() fails
  f2fs: alloc new nids for xattr block in recovery
  f2fs: spread struct f2fs_dentry_ptr for inline path
  f2fs: remove unused input parameter

Change-Id: I1f92016cb225e90586307528f497d656d40cabe8
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>