btrfs: update stale comment for count_range_bits()

The comment for count_range_bits() mentions that the search is fast if we
are asking for a range with the EXTENT_DIRTY bit set. However that is no
longer true since we don't use that bit and the optimization for that was
removed in:

  commit 71528e9e ("btrfs: get rid of extent_io_tree::dirty_bytes")

So remove that part of the comment mentioning the no longer existing
optimized case, and, while at it, add proper documentation describing the
purpose, arguments and return value of the function.
Signed-off-by: NFilipe Manana <fdmanana@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/extent-io-tree.c

@@ -1515,9 +1515,29 @@ void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start,
 }
 
 /*
- * Count the number of bytes in the tree that have a given bit(s) set.  This
- * can be fairly slow, except for EXTENT_DIRTY which is cached.  The total
- * number found is returned.
+ * Count the number of bytes in the tree that have a given bit(s) set for a
+ * given range.
+ *
+ * @tree:         The io tree to search.
+ * @start:        The start offset of the range. This value is updated to the
+ *                offset of the first byte found with the given bit(s), so it
+ *                can end up being bigger than the initial value.
+ * @search_end:   The end offset (inclusive value) of the search range.
+ * @max_bytes:    The maximum byte count we are interested. The search stops
+ *                once it reaches this count.
+ * @bits:         The bits the range must have in order to be accounted for.
+ *                If multiple bits are set, then only subranges that have all
+ *                the bits set are accounted for.
+ * @contig:       Indicate if we should ignore holes in the range or not. If
+ *                this is true, then stop once we find a hole.
+ * @cached_state: A cached state to be used across multiple calls to this
+ *                function in order to speedup searches. Use NULL if this is
+ *                called only once or if each call does not start where the
+ *                previous one ended.
+ *
+ * Returns the total number of bytes found within the given range that have
+ * all given bits set. If the returned number of bytes is greater than zero
+ * then @start is updated with the offset of the first byte with the bits set.
  */
 u64 count_range_bits(struct extent_io_tree *tree,
 		     u64 *start, u64 search_end, u64 max_bytes,