Function swapgeom_strategy

freebsd/vm/swap_pager.c:2810–2861

}

static void
swapgeom_strategy(struct buf *bp, struct swdevt *sp)
{
	struct bio *bio;
	struct g_consumer *cp;

	mtx_lock(&sw_dev_mtx);
	cp = sp->sw_id;
	if (cp == NULL) {
		mtx_unlock(&sw_dev_mtx);
		bp->b_error = ENXIO;
		bp->b_ioflags |= BIO_ERROR;
		bufdone(bp);
		return;
	}
	swapgeom_acquire(cp);
	mtx_unlock(&sw_dev_mtx);
	if (bp->b_iocmd == BIO_WRITE)
		bio = g_new_bio();
	else
		bio = g_alloc_bio();
	if (bio == NULL) {
		mtx_lock(&sw_dev_mtx);
		swapgeom_release(cp, sp);
		mtx_unlock(&sw_dev_mtx);
		bp->b_error = ENOMEM;
		bp->b_ioflags |= BIO_ERROR;
		printf("swap_pager: cannot allocate bio\n");
		bufdone(bp);
		return;
	}

	bp->b_caller1 = bio;
	bio->bio_caller1 = sp;
	bio->bio_caller2 = bp;
	bio->bio_cmd = bp->b_iocmd;
	bio->bio_offset = (bp->b_blkno - sp->sw_first) * PAGE_SIZE;
	bio->bio_length = bp->b_bcount;
	bio->bio_done = swapgeom_done;
	if (!buf_mapped(bp)) {
		bio->bio_ma = bp->b_pages;
		bio->bio_data = unmapped_buf;
		bio->bio_ma_offset = (vm_offset_t)bp->b_offset & PAGE_MASK;
		bio->bio_ma_n = bp->b_npages;
		bio->bio_flags |= BIO_UNMAPPED;
	} else {
		bio->bio_data = bp->b_data;
		bio->bio_ma = NULL;
	}
	g_io_request(bio, cp);
	return;
}

static void
swapgeom_orphan(struct g_consumer *cp)