Function dmu_buf_init_user

freebsd/contrib/openzfs/include/sys/dmu.h:669–685

* Initialize the given dmu_buf_user_t instance with the eviction function * evict_func, to be called when the user is evicted. * * NOTE: This function should only be called once on a given dmu_buf_user_t. * To allow enforcement of this, dbu must already be zeroed on entry. */ ARGSUSED*/

 */
/*ARGSUSED*/
static inline void
dmu_buf_init_user(dmu_buf_user_t *dbu, dmu_buf_evict_func_t *evict_func_sync,
    dmu_buf_evict_func_t *evict_func_async,
    dmu_buf_t **clear_on_evict_dbufp __maybe_unused)
{
	ASSERT(dbu->dbu_evict_func_sync == NULL);
	ASSERT(dbu->dbu_evict_func_async == NULL);

	/* must have at least one evict func */
	IMPLY(evict_func_sync == NULL, evict_func_async != NULL);
	dbu->dbu_evict_func_sync = evict_func_sync;
	dbu->dbu_evict_func_async = evict_func_async;
	taskq_init_ent(&dbu->dbu_tqent);
#ifdef ZFS_DEBUG
	dbu->dbu_clear_on_evict_dbufp = clear_on_evict_dbufp;
#endif
}

/*
 * Attach user data to a dbuf and mark it for normal (when the dbuf's