Function dbuf_read_done

freebsd/contrib/openzfs/module/zfs/dbuf.c:1248–1288

}

static void
dbuf_read_done(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp,
    arc_buf_t *buf, void *vdb)
{
	dmu_buf_impl_t *db = vdb;

	mutex_enter(&db->db_mtx);
	ASSERT3U(db->db_state, ==, DB_READ);
	/*
	 * All reads are synchronous, so we must have a hold on the dbuf
	 */
	ASSERT(zfs_refcount_count(&db->db_holds) > 0);
	ASSERT(db->db_buf == NULL);
	ASSERT(db->db.db_data == NULL);
	if (buf == NULL) {
		/* i/o error */
		ASSERT(zio == NULL || zio->io_error != 0);
		ASSERT(db->db_blkid != DMU_BONUS_BLKID);
		ASSERT3P(db->db_buf, ==, NULL);
		db->db_state = DB_UNCACHED;
		DTRACE_SET_STATE(db, "i/o error");
	} else if (db->db_level == 0 && db->db_freed_in_flight) {
		/* freed in flight */
		ASSERT(zio == NULL || zio->io_error == 0);
		arc_release(buf, db);
		bzero(buf->b_data, db->db.db_size);
		arc_buf_freeze(buf);
		db->db_freed_in_flight = FALSE;
		dbuf_set_data(db, buf);
		db->db_state = DB_CACHED;
		DTRACE_SET_STATE(db, "freed in flight");
	} else {
		/* success */
		ASSERT(zio == NULL || zio->io_error == 0);
		dbuf_set_data(db, buf);
		db->db_state = DB_CACHED;
		DTRACE_SET_STATE(db, "successful read");
	}
	cv_broadcast(&db->db_changed);
	dbuf_rele_and_unlock(db, NULL, B_FALSE);
}

/*
 * Shortcut for performing reads on bonus dbufs.  Returns