bch_bio_alloc_pages
if (!bch_bio_alloc_pages(b->bio, GFP_NOWAIT)) {
if (bch_bio_alloc_pages(check, GFP_NOIO))
if (bch_bio_alloc_pages(bio, GFP_KERNEL))
if (bch_bio_alloc_pages(cache_bio, __GFP_NOWARN|GFP_NOIO))
int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask);
if (bch_bio_alloc_pages(&io->bio, GFP_KERNEL))