ext4: fix quota accounting in case of fallocate

allocated_meta_data is already included in 'used' variable.
Signed-off-by: NDmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

fs/ext4/inode.c

@@ -1126,7 +1126,8 @@ void ext4_da_update_reserve_space(struct inode *inode,
 		 */
 		if (allocated_meta_blocks)
 			dquot_claim_block(inode, allocated_meta_blocks);
-		dquot_release_reservation_block(inode, mdb_free + used);
+		dquot_release_reservation_block(inode, mdb_free + used -
+						allocated_meta_blocks);
 	}
 
 	/*