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BIO_ALLOC(9)			 The Linux VFS			  BIO_ALLOC(9)

NAME
       bio_alloc - allocate a new bio, memory pool backed

SYNOPSIS
       struct bio * bio_alloc(gfp_t gfp_mask, int nr_iovecs);

ARGUMENTS
       gfp_mask
	   allocation mask to use

       nr_iovecs
	   number of iovecs

DESCRIPTION
       bio_alloc will allocate a bio and associated bio_vec array that can
       hold at least nr_iovecs entries. Allocations will be done from the
       fs_bio_set. Also see bio_alloc_bioset and bio_kmalloc.

       If __GFP_WAIT is set, then bio_alloc will always be able to allocate a
       bio. This is due to the mempool guarantees. To make this work, callers
       must never allocate more than 1 bio at a time from this pool. Callers
       that need to allocate more than 1 bio must always submit the previously
       allocated bio for IO before attempting to allocate a new one. Failure
       to do so can cause livelocks under memory pressure.

RETURNS
       Pointer to new bio on success, NULL on failure.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013			  BIO_ALLOC(9)

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