centos man page for bio_get_nr_vecs

BIO_GET_NR_VECS(9)						   The Linux VFS						BIO_GET_NR_VECS(9)

NAME
       bio_get_nr_vecs - return approx number of vecs

SYNOPSIS
       int bio_get_nr_vecs(struct block_device * bdev);

ARGUMENTS
       bdev
	   I/O target

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.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							BIO_GET_NR_VECS(9)