Name
bio_get_nr_vecs — 
     return approx number of vecs
 
Synopsis
| int fsfuncbio_get_nr_vecs ( | struct block_device * bdev ); | 
 
Description
   Return the approximate number of pages we can send to this target.
   There's no guarantee that you will be able to fit this number of pages
   into a bio, it does not account for dynamic restrictions that vary
   on offset.