NTFS: Attempting to write outside initialized size is _not_ a bug so remove

      the bug check from fs/ntfs/aops.c::ntfs_write_mst_block().  It is in
      fact required to write outside initialized size when preparing to
      extend the initialized size.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

fs/ntfs/ChangeLog

@@ -76,6 +76,10 @@ ToDo/Notes:
 	- Modify fs/ntfs/mft.c::write_mft_record_nolock() so that it only
 	  writes the mft record if the buffers belonging to it are dirty.
 	  Otherwise we assume that it was written out by other means already.
+	- Attempting to write outside initialized size is _not_ a bug so remove
+	  the bug check from fs/ntfs/aops.c::ntfs_write_mst_block().  It is in
+	  fact required to write outside initialized size when preparing to
+	  extend the initialized size.
 
 2.1.20 - Fix two stupid bugs introduced in 2.1.18 release.
 

fs/ntfs/aops.c

@@ -892,8 +892,6 @@ static int ntfs_write_mst_block(struct writeback_control *wbc,
 			}
 			BUG_ON(!rec_is_dirty);
 		}
-		/* Attempting to write outside the initialized size is a bug. */
-		BUG_ON(((block + 1) << bh_size_bits) > ni->initialized_size);
 		if (!buffer_mapped(bh)) {
 			ntfs_error(vol->sb, "Writing ntfs records without "
 					"existing mapped buffers is not "