f2fs: updates on v4.16-rc1

Pull f2fs updates from Jaegeuk Kim:
 "In this round, we've followed up to support some generic features such
  as cgroup, block reservation, linking fscrypt_ops, delivering
  write_hints, and some ioctls. And, we could fix some corner cases in
  terms of power-cut recovery and subtle deadlocks.

  Enhancements:
   - bitmap operations to handle NAT blocks
   - readahead to improve readdir speed
   - switch to use fscrypt_*
   - apply write hints for direct IO
   - add reserve_root=%u,resuid=%u,resgid=%u to reserve blocks for root/uid/gid
   - modify b_avail and b_free to consider root reserved blocks
   - support cgroup writeback
   - support FIEMAP_FLAG_XATTR for fibmap
   - add F2FS_IOC_PRECACHE_EXTENTS to pre-cache extents
   - add F2FS_IOC_{GET/SET}_PIN_FILE to pin LBAs for data blocks
   - support inode creation time

  Bug fixs:
   - sysfile-based quota operations
   - memory footprint accounting
   - allow to write data on partial preallocation case
   - fix deadlock case on fallocate
   - fix to handle fill_super errors
   - fix missing inode updates of fsync'ed file
   - recover renamed file which was fsycn'ed before
   - drop inmemory pages in corner error case
   - keep last_disk_size correctly
   - recover missing i_inline flags during roll-forward

  Various clean-up patches were added as well"

Cherry-pick from origin/upstream-f2fs-stable-linux-4.14.y:

00f0eaaa f2fs: support inode creation time
3e7444ad f2fs: rebuild sit page from sit info in mem
76688790 f2fs: stop issuing discard if fs is readonly
ae93dca2 f2fs: clean up duplicated assignment in init_discard_policy
0052bba1 f2fs: use GFP_F2FS_ZERO for cleanup
6271336c f2fs: allow to recover node blocks given updated checkpoint
e003a2d1 f2fs: recover some i_inline flags
3cafae53 f2fs: correct removexattr behavior for null valued extended attribute
78d7fa9a f2fs: drop page cache after fs shutdown
150b61ce f2fs: stop gc/discard thread after fs shutdown
cf27ccc4 f2fs: hanlde error case in f2fs_ioc_shutdown
1526117c f2fs: split need_inplace_update
cd576d7b f2fs: fix to update last_disk_size correctly
7a57bd33 f2fs: kill F2FS_INLINE_XATTR_ADDRS for cleanup
95eb6a6c f2fs: clean up error path of fill_super
63c949c9 f2fs: avoid hungtask when GC encrypted block if io_bits is set
583d13d1 f2fs: allow quota to use reserved blocks
fbe371d3 f2fs: fix to drop all inmem pages correctly
7e08ce43 f2fs: speed up defragment on sparse file
0f914cab f2fs: support F2FS_IOC_PRECACHE_EXTENTS
ed1311e5 f2fs: add an ioctl to disable GC for specific file
b08974ab f2fs: prevent newly created inode from being dirtied incorrectly
e8a8acf6 f2fs: support FIEMAP_FLAG_XATTR
042aeed6 f2fs: fix to cover f2fs_inline_data_fiemap with inode_lock
9cf9c37e f2fs: check node page again in write end io
b9eedb48 f2fs: fix to caclulate required free section correctly
75ae50cf f2fs: handle newly created page when revoking inmem pages
871b9749 f2fs: add resgid and resuid to reserve root blocks
0cf361ac f2fs: implement cgroup writeback support
196d52cf f2fs: remove unused pend_list_tag
6e899a83 f2fs: avoid high cpu usage in discard thread
bb1af976 f2fs: make local functions static
ad658936 f2fs: add reserved blocks for root user
c6e64f1f f2fs: check segment type in __f2fs_replace_block
88cdc60b f2fs: update inode info to inode page for new file
4203e9fb f2fs: show precise # of blocks that user/root can use
47dc1372 f2fs: clean up unneeded declaration
27f9e551 f2fs: continue to do direct IO if we only preallocate partial blocks
f2f13783 f2fs: enable quota at remount from r to w
d507f300 f2fs: skip stop_checkpoint for user data writes
4b242ffc f2fs: fix missing error number for xattr operation
c6c76a0e f2fs: recover directory operations by fsync
5943e399 f2fs: return error during fill_super
93579c97 f2fs: fix an error case of missing update inode page
3d753c15 f2fs: fix potential hangtask in f2fs_trace_pid
625f066c f2fs: no need return value in restore summary process
f76c831a f2fs: use unlikely for release case
0408ad5e f2fs: don't return value in truncate_data_blocks_range
62e507cd f2fs: clean up f2fs_map_blocks
233b1977 f2fs: clean up hash codes
58d550e5 f2fs: fix error handling in fill_super
35d78e6f f2fs: spread f2fs_k{m,z}alloc
fecf31ce f2fs: inject fault to kvmalloc
41af39db f2fs: inject fault to kzalloc
9fecb415 f2fs: remove a redundant conditional expression
8e56c02e f2fs: apply write hints to select the type of segment for direct write
a4015f91 f2fs: switch to fscrypt_prepare_setattr()
56351ec7 f2fs: switch to fscrypt_prepare_lookup()
51f2caab f2fs: switch to fscrypt_prepare_rename()
f9a35b22 f2fs: switch to fscrypt_prepare_link()
787bd263 f2fs: switch to fscrypt_file_open()
eb9d8ee0 posix_acl: convert posix_acl.a_refcount from atomic_t to refcount_t
bd0bb8ab f2fs: remove repeated f2fs_bug_on
d1c0441c f2fs: remove an excess variable
3f12c94d f2fs: fix lock dependency in between dio_rwsem & i_mmap_sem
39685b35 f2fs: remove unused parameter
b8357704 f2fs: still write data if preallocate only partial blocks
b61cf217 f2fs: introduce sysfs readdir_ra to readahead inode block in readdir
44ed9b2d f2fs: fix concurrent problem for updating free bitmap
08be3792 f2fs: remove unneeded memory footprint accounting
33362399 f2fs: no need to read nat block if nat_block_bitmap is set
01bb5c8b f2fs: reserve nid resource for quota sysfile

Change-Id: Ie0beb18a04fc300d1591d64c7ae542a478644e26
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>