static struct kmem_cache *bio_slab __read_mostly;
-mempool_t *bio_split_pool __read_mostly;
+static mempool_t *bio_split_pool __read_mostly;
/*
* if you change this list, also change bvec_alloc or things will
* split a bio - only worry about a bio with a single page
* in it's iovec
*/
-struct bio_pair *bio_split(struct bio *bi, mempool_t *pool, int first_sectors)
+struct bio_pair *bio_split(struct bio *bi, int first_sectors)
{
- struct bio_pair *bp = mempool_alloc(pool, GFP_NOIO);
+ struct bio_pair *bp = mempool_alloc(bio_split_pool, GFP_NOIO);
if (!bp)
return bp;
bp->bio2.bi_end_io = bio_pair_end_2;
bp->bio1.bi_private = bi;
- bp->bio2.bi_private = pool;
+ bp->bio2.bi_private = bio_split_pool;
if (bio_integrity(bi))
bio_integrity_split(bi, bp, first_sectors);
return bp;
}
+/**
+ * bio_sector_offset - Find hardware sector offset in bio
+ * @bio: bio to inspect
+ * @index: bio_vec index
+ * @offset: offset in bv_page
+ *
+ * Return the number of hardware sectors between beginning of bio
+ * and an end point indicated by a bio_vec index and an offset
+ * within that vector's page.
+ */
+sector_t bio_sector_offset(struct bio *bio, unsigned short index,
+ unsigned int offset)
+{
+ unsigned int sector_sz = queue_hardsect_size(bio->bi_bdev->bd_disk->queue);
+ struct bio_vec *bv;
+ sector_t sectors;
+ int i;
+
+ sectors = 0;
+
+ if (index >= bio->bi_idx)
+ index = bio->bi_vcnt - 1;
+
+ __bio_for_each_segment(bv, bio, i, 0) {
+ if (i == index) {
+ if (offset > bv->bv_offset)
+ sectors += (offset - bv->bv_offset) / sector_sz;
+ break;
+ }
+
+ sectors += bv->bv_len / sector_sz;
+ }
+
+ return sectors;
+}
+EXPORT_SYMBOL(bio_sector_offset);
/*
* create memory pools for biovec's in a bio_set.
EXPORT_SYMBOL(bio_copy_kern);
EXPORT_SYMBOL(bio_pair_release);
EXPORT_SYMBOL(bio_split);
-EXPORT_SYMBOL(bio_split_pool);
EXPORT_SYMBOL(bio_copy_user);
EXPORT_SYMBOL(bio_uncopy_user);
EXPORT_SYMBOL(bioset_create);