f2fs/fscrypt: updates to v4.17-rc1

f2fs/fscrypt: updates to v4.17-rc1

Pull f2fs update from Jaegeuk Kim:
 "In this round, we've mainly focused on performance tuning and critical
  bug fixes occurred in low-end devices. Sheng Yong introduced
  lost_found feature to keep missing files during recovery instead of
  thrashing them. We're preparing coming fsverity implementation. And,
  we've got more features to communicate with users for better
  performance. In low-end devices, some memory-related issues were
  fixed, and subtle race condtions and corner cases were addressed as
  well.

  Enhancements:
   - large nat bitmaps for more free node ids
   - add three block allocation policies to pass down write hints given by user
   - expose extension list to user and introduce hot file extension
   - tune small devices seamlessly for low-end devices
   - set readdir_ra by default
   - give more resources under gc_urgent mode regarding to discard and cleaning
   - introduce fsync_mode to enforce posix or not
   - nowait aio support
   - add lost_found feature to keep dangling inodes
   - reserve bits for future fsverity feature
   - add test_dummy_encryption for FBE

  Bug fixes:
   - don't use highmem for dentry pages
   - align memory boundary for bitops
   - truncate preallocated blocks in write errors
   - guarantee i_times on fsync call
   - clear CP_TRIMMED_FLAG correctly
   - prevent node chain loop during recovery
   - avoid data race between atomic write and background cleaning
   - avoid unnecessary selinux violation warnings on resgid option
   - GFP_NOFS to avoid deadlock in quota and read paths
   - fix f2fs_skip_inode_update to allow i_size recovery

  In addition to the above, there are several minor bug fixes and clean-ups"

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

de465aa57271 f2fs: remain written times to update inode during fsync
d0ebaf0b37b2 f2fs: make assignment of t->dentry_bitmap more readable
7f05fb451696 f2fs: truncate preallocated blocks in error case
a0a9a51ecdd1 f2fs: fix a wrong condition in f2fs_skip_inode_update
5dc89047c9e8 f2fs: reserve bits for fs-verity
0751f01376d5 f2fs: Add a segment type check in inplace write
27d9598d4d38 f2fs: no need to initialize zero value for GFP_F2FS_ZERO
42a34ff76240 f2fs: don't track new nat entry in nat set
14040505a620 f2fs: clean up with F2FS_BLK_ALIGN
fcea9e00a0ea f2fs: check blkaddr more accuratly before issue a bio
2c217b078fee f2fs: Set GF_NOFS in read_cache_page_gfp while doing f2fs_quota_read
0a8cedc2cea3 f2fs: introduce a new mount option test_dummy_encryption
5786b414a719 f2fs: introduce F2FS_FEATURE_LOST_FOUND feature
9813cae680f0 f2fs: release locks before return in f2fs_ioc_gc_range()
cee6482cd12c f2fs: align memory boundary for bitops
8dbfcba5f5d6 f2fs: remove unneeded set_cold_node()
7e93bf8ebc34 f2fs: add nowait aio support
1e64d3ed2753 f2fs: wrap all options with f2fs_sb_info.mount_opt
7f270a67a1da f2fs: Don't overwrite all types of node to keep node chain
c6a9e6a41f4f f2fs: introduce mount option for fsync mode
82bebed3c1fd f2fs: fix to restore old mount option in ->remount_fs
808427a63b93 f2fs: wrap sb_rdonly with f2fs_readonly
5ebe362c0c60 f2fs: avoid selinux denial on CAP_SYS_RESOURCE
ea34734357a9 f2fs: support hot file extension
2189c2e46468 f2fs: fix to avoid race in between atomic write and background GC
5f6950805928 f2fs: do gc in greedy mode for whole range if gc_urgent mode is set
79f1a15fa536 f2fs: issue discard aggressively in the gc_urgent mode
aea8da88a747 f2fs: set readdir_ra by default
8fe06ea28273 f2fs: add auto tuning for small devices
073c145d5bef f2fs: add mount option for segment allocation policy
e7efe40d7aa5 f2fs: don't stop GC if GC is contended
882d0e094488 f2fs: expose extension_list sysfs entry
52320a2a28be f2fs: fix to set KEEP_SIZE bit in f2fs_zero_range
ef66237f28e9 f2fs: introduce sb_lock to make encrypt pwsalt update exclusive
c8e77267ed1f f2fs: remove redundant initialization of pointer 'p'
755dcc3262d4 f2fs: flush cp pack except cp pack 2 page at first
92223ccb699a f2fs: clean up f2fs_sb_has_xxx functions
d8ecd46ca803 f2fs: remove redundant check of page type when submit bio
99f512132e54 f2fs: fix to handle looped node chain during recovery
66a2346def3d f2fs: handle quota for orphan inodes
bd9e1956d17e f2fs: support passing down write hints to block layer with F2FS policy
d8f02c3b68c5 f2fs: support passing down write hints given by users to block layer
d4fff1411d4e f2fs: fix to clear CP_TRIMMED_FLAG
f50100868cb8 f2fs: support large nat bitmap
e9437125502c f2fs: fix to check extent cache in f2fs_drop_extent_tree
5c1d55c37f2c f2fs: restrict inline_xattr_size configuration
74d48dc6ec93 f2fs: fix heap mode to reset it back
68afcb259568 f2fs: fix potential corruption in area before F2FS_SUPER_OFFSET
6b4edfb10398 fscrypt: fix build with pre-4.6 gcc versions
4bcc4865feab fscrypt: remove 'ci' parameter from fscrypt_put_encryption_info()
69e5234f04b6 fscrypt: fix up fscrypt_fname_encrypted_size() for internal use
7919cba92304 fscrypt: define fscrypt_fname_alloc_buffer() to be for presented names
aef0017f3b1a fscrypt: calculate NUL-padding length in one place only
5232cae0e922 fscrypt: move fscrypt_symlink_data to fscrypt_private.h
169bd9ba8542 ubifs: switch to fscrypt_get_symlink()
63498ca7def3 ubifs: switch to fscrypt ->symlink() helper functions
a85637d12cb1 fscrypt: remove fscrypt_fname_usr_to_disk()
77bb20f72679 ext4: switch to fscrypt_get_symlink()
79b3f39a2e79 ext4: switch to fscrypt ->symlink() helper functions
70fe2fb67bc6 f2fs: switch to fscrypt_get_symlink()
96dda4e02d6b f2fs: switch to fscrypt ->symlink() helper functions
0063988cc044 fscrypt: new helper function - fscrypt_get_symlink()
48a0375c8889 fscrypt: new helper functions for ->symlink()
585a194dd1d0 fscrypt: trim down fscrypt.h includes
411771ab56f4 fscrypt: move fscrypt_is_dot_dotdot() to fs/crypto/fname.c
ad35db34396b fscrypt: move fscrypt_valid_enc_modes() to fscrypt_private.h
72b3e1c61d8b fscrypt: move fscrypt_operations declaration to fscrypt_supp.h
2fa9a1f9268a fscrypt: split fscrypt_dummy_context_enabled() into supp/notsupp versions
e298b5de1cca fscrypt: move fscrypt_ctx declaration to fscrypt_supp.h
8db0a6de3cf0 fscrypt: move fscrypt_info_cachep declaration to fscrypt_private.h
c73c350ade4e fscrypt: move fscrypt_control_page() to supp/notsupp headers
ca64f2f4609d fscrypt: move fscrypt_has_encryption_key() to supp/notsupp headers

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