Function abd_get_from_buf

freebsd/contrib/openzfs/module/zfs/abd.c:598–618

* Allocate a linear ABD structure for buf. You must free this with abd_put() * since the resulting ABD doesn't own its own buffer. */

 * since the resulting ABD doesn't own its own buffer.
 */
abd_t *
abd_get_from_buf(void *buf, size_t size)
{
	abd_t *abd = abd_alloc_struct(0);

	VERIFY3U(size, <=, SPA_MAXBLOCKSIZE);

	/*
	 * Even if this buf is filesystem metadata, we only track that if we
	 * own the underlying data buffer, which is not true in this case.
	 * Therefore, we don't ever use ABD_FLAG_META here.
	 */
	abd->abd_flags = ABD_FLAG_LINEAR;
	abd->abd_size = size;
	abd->abd_parent = NULL;
	zfs_refcount_create(&abd->abd_children);

	ABD_LINEAR_BUF(abd) = buf;

	return (abd);
}

/*
 * Get the raw buffer associated with a linear ABD.