suse man page for bio_alloc_bioset

BIO_ALLOC_BIOSET(9)						   The Linux VFS					       BIO_ALLOC_BIOSET(9)

NAME
       bio_alloc_bioset - allocate a bio for I/O

SYNOPSIS
       struct bio * bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set * bs);

ARGUMENTS
       gfp_mask
	   the GFP_ mask given to the slab allocator

       nr_iovecs
	   number of iovecs to pre-allocate

       bs
	   the bio_set to allocate from.

DESCRIPTION
       bio_alloc_bioset will try its own mempool to satisfy the allocation. If __GFP_WAIT is set then we will block on the internal pool waiting
       for a struct bio to become free.

       Note that the caller must set ->bi_destructor on successful return of a bio, to do the appropriate freeing of the bio once the reference
       count drops to zero.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						       BIO_ALLOC_BIOSET(9)