Btrfs: fix race between block group relocation and nocow writes

Relocation of a block group waits for all existing tasks flushing
dellaloc, starting direct IO writes and any ordered extents before
starting the relocation process. However for direct IO writes that end
up doing nocow (inode either has the flag nodatacow set or the write is
against a prealloc extent) we have a short time window that allows for a
race that makes relocation proceed without waiting for the direct IO
write to complete first, resulting in data loss after the relocation
finishes. This is illustrated by the following diagram:

           CPU 1                                     CPU 2

 btrfs_relocate_block_group(bg X)

                                               direct IO write starts against
                                               an extent in block group X
                                               using nocow mode (inode has the
                                               nodatacow flag or the write is
                                               for a prealloc extent)

                                               btrfs_direct_IO()
                                                 btrfs_get_blocks_direct()
                                                   --> can_nocow_extent() returns 1

   btrfs_inc_block_group_ro(bg X)
     --> turns block group into RO mode

   btrfs_wait_ordered_roots()
     --> returns and does not know about
         the DIO write happening at CPU 2
         (the task there has not created
          yet an ordered extent)

   relocate_block_group(bg X)
     --> rc->stage == MOVE_DATA_EXTENTS

     find_next_extent()
       --> returns extent that the DIO
           write is going to write to

     relocate_data_extent()

       relocate_file_extent_cluster()

         --> reads the extent from disk into
             pages belonging to the relocation
             inode and dirties them

                                                   --> creates DIO ordered extent

                                                 btrfs_submit_direct()
                                                   --> submits bio against a location
                                                       on disk obtained from an extent
                                                       map before the relocation started

   btrfs_wait_ordered_range()
     --> writes all the pages read before
         to disk (belonging to the
         relocation inode)

   relocation finishes

                                                 bio completes and wrote new data
                                                 to the old location of the block
                                                 group

So fix this by tracking the number of nocow writers for a block group and
make sure relocation waits for that number to go down to 0 before starting
to move the extents.

The same race can also happen with buffered writes in nocow mode since the
patch I recently made titled "Btrfs: don't do unnecessary delalloc flushes
when relocating", because we are no longer flushing all delalloc which
served as a synchonization mechanism (due to page locking) and ensured
the ordered extents for nocow buffered writes were created before we
called btrfs_wait_ordered_roots(). The race with direct IO writes in nocow
mode existed before that patch (no pages are locked or used during direct
IO) and that fixed only races with direct IO writes that do cow.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>