btrfs: fix data race when accessing the last_trans field of a root

KCSAN complains about a data race when accessing the last_trans field of a
root:

  [  199.553628] BUG: KCSAN: data-race in btrfs_record_root_in_trans [btrfs] / record_root_in_trans [btrfs]

  [  199.555186] read to 0x000000008801e308 of 8 bytes by task 2812 on cpu 1:
  [  199.555210]  btrfs_record_root_in_trans+0x9a/0x128 [btrfs]
  [  199.555999]  start_transaction+0x154/0xcd8 [btrfs]
  [  199.556780]  btrfs_join_transaction+0x44/0x60 [btrfs]
  [  199.557559]  btrfs_dirty_inode+0x9c/0x140 [btrfs]
  [  199.558339]  btrfs_update_time+0x8c/0xb0 [btrfs]
  [  199.559123]  touch_atime+0x16c/0x1e0
  [  199.559151]  pipe_read+0x6a8/0x7d0
  [  199.559179]  vfs_read+0x466/0x498
  [  199.559204]  ksys_read+0x108/0x150
  [  199.559230]  __s390x_sys_read+0x68/0x88
  [  199.559257]  do_syscall+0x1c6/0x210
  [  199.559286]  __do_syscall+0xc8/0xf0
  [  199.559318]  system_call+0x70/0x98

  [  199.559431] write to 0x000000008801e308 of 8 bytes by task 2808 on cpu 0:
  [  199.559464]  record_root_in_trans+0x196/0x228 [btrfs]
  [  199.560236]  btrfs_record_root_in_trans+0xfe/0x128 [btrfs]
  [  199.561097]  start_transaction+0x154/0xcd8 [btrfs]
  [  199.561927]  btrfs_join_transaction+0x44/0x60 [btrfs]
  [  199.562700]  btrfs_dirty_inode+0x9c/0x140 [btrfs]
  [  199.563493]  btrfs_update_time+0x8c/0xb0 [btrfs]
  [  199.564277]  file_update_time+0xb8/0xf0
  [  199.564301]  pipe_write+0x8ac/0xab8
  [  199.564326]  vfs_write+0x33c/0x588
  [  199.564349]  ksys_write+0x108/0x150
  [  199.564372]  __s390x_sys_write+0x68/0x88
  [  199.564397]  do_syscall+0x1c6/0x210
  [  199.564424]  __do_syscall+0xc8/0xf0
  [  199.564452]  system_call+0x70/0x98

This is because we update and read last_trans concurrently without any
type of synchronization. This should be generally harmless and in the
worst case it can make us do extra locking (btrfs_record_root_in_trans())
trigger some warnings at ctree.c or do extra work during relocation - this
would probably only happen in case of load or store tearing.

So fix this by always reading and updating the field using READ_ONCE()
and WRITE_ONCE(), this silences KCSAN and prevents load and store tearing.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>