/* ARGSUSED */
static int
dsl_prop_notify_all_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
{
dsl_dir_t *dd = ds->ds_dir;
dsl_prop_record_t *pr;
dsl_prop_cb_record_t *cbr;
mutex_enter(&dd->dd_lock);
for (pr = list_head(&dd->dd_props);
pr; pr = list_next(&dd->dd_props, pr)) {
for (cbr = list_head(&pr->pr_cbs); cbr;
cbr = list_next(&pr->pr_cbs, cbr)) {
uint64_t value;
/*
* Callback entries do not have holds on their
* datasets so that datasets with registered
* callbacks are still eligible for eviction.
* Unlike operations to update properties on a
* single dataset, we are performing a recursive
* descent of related head datasets. The caller
* of this function only has a dataset hold on
* the passed in head dataset, not the snapshots
* associated with this dataset. Without a hold,
* the dataset pointer within callback records
* for snapshots can be invalidated by eviction
* at any time.
*
* Use dsl_dataset_try_add_ref() to verify
* that the dataset for a snapshot has not
* begun eviction processing and to prevent
* eviction from occurring for the duration of
* the callback. If the hold attempt fails,
* this object is already being evicted and the
* callback can be safely ignored.
*/
if (ds != cbr->cbr_ds &&
!dsl_dataset_try_add_ref(dp, cbr->cbr_ds, FTAG))
continue;
if (dsl_prop_get_ds(cbr->cbr_ds,
cbr->cbr_pr->pr_propname, sizeof (value), 1,
&value, NULL) == 0)
cbr->cbr_func(cbr->cbr_arg, value);
if (ds != cbr->cbr_ds)
dsl_dataset_rele(cbr->cbr_ds, FTAG);
}
}
mutex_exit(&dd->dd_lock);
return (0);
}
/* ARGSUSED */
static int
dsl_prop_notify_all_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
{
dsl_dir_t *dd = ds->ds_dir;
dsl_prop_cb_record_t *cbr;
mutex_enter(&dd->dd_lock);
for (cbr = list_head(&dd->dd_prop_cbs); cbr;
cbr = list_next(&dd->dd_prop_cbs, cbr)) {
uint64_t value;
/*
* Callback entries do not have holds on their datasets
* so that datasets with registered callbacks are still
* eligible for eviction. Unlike operations on callbacks
* for a single dataset, we are performing a recursive
* descent of related datasets and the calling context
* for this iteration only has a dataset hold on the root.
* Without a hold, the callback's pointer to the dataset
* could be invalidated by eviction at any time.
*
* Use dsl_dataset_try_add_ref() to verify that the
* dataset has not begun eviction processing and to
* prevent eviction from occurring for the duration
* of the callback. If the hold attempt fails, this
* object is already being evicted and the callback can
* be safely ignored.
*/
if (!dsl_dataset_try_add_ref(dp, cbr->cbr_ds, FTAG))
continue;
if (dsl_prop_get_ds(cbr->cbr_ds, cbr->cbr_propname,
sizeof (value), 1, &value, NULL) == 0)
cbr->cbr_func(cbr->cbr_arg, value);
dsl_dataset_rele(cbr->cbr_ds, FTAG);
}
mutex_exit(&dd->dd_lock);
return (0);
}
