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ztest: Fix false positive of ENOSPC handling

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Before running a pass zs_enospc_count is checked to free up some space
by destroying a random dataset. But the space freed may still be not
re-usable during the TXG_DEFER window breaking the next dataset creation
in ztest_generic_run().
    
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Igor Ostapenko <igor.ostapenko@klarasystems.com>
Closes #17506
This commit is contained in:
Igor Ostapenko 2025-07-04 02:00:13 +03:00 committed by Brian Behlendorf
parent f7698f47e8
commit 90d2c4407a
1 changed files with 23 additions and 16 deletions
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39
cmd/ztest.c
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@ -7812,6 +7812,9 @@ ztest_dataset_open(int d)
ztest_dataset_name(name, ztest_opts.zo_pool, d);
if (ztest_opts.zo_verbose >= 6)
(void) printf("Opening %s\n", name);
(void) pthread_rwlock_rdlock(&ztest_name_lock);
error = ztest_dataset_create(name);
@ -8307,41 +8310,44 @@ static void
ztest_generic_run(ztest_shared_t *zs, spa_t *spa)
{
kthread_t **run_threads;
int t;
int i, ndatasets;
run_threads = umem_zalloc(ztest_opts.zo_threads * sizeof (kthread_t *),
UMEM_NOFAIL);
/*
* Actual number of datasets to be used.
*/
ndatasets = MIN(ztest_opts.zo_datasets, ztest_opts.zo_threads);
/*
* Prepare the datasets first.
*/
for (i = 0; i < ndatasets; i++)
VERIFY0(ztest_dataset_open(i));
/*
* Kick off all the tests that run in parallel.
*/
for (t = 0; t < ztest_opts.zo_threads; t++) {
if (t < ztest_opts.zo_datasets && ztest_dataset_open(t) != 0) {
umem_free(run_threads, ztest_opts.zo_threads *
sizeof (kthread_t *));
return;
}
run_threads[t] = thread_create(NULL, 0, ztest_thread,
(void *)(uintptr_t)t, 0, NULL, TS_RUN | TS_JOINABLE,
for (i = 0; i < ztest_opts.zo_threads; i++) {
run_threads[i] = thread_create(NULL, 0, ztest_thread,
(void *)(uintptr_t)i, 0, NULL, TS_RUN | TS_JOINABLE,
defclsyspri);
}
/*
* Wait for all of the tests to complete.
*/
for (t = 0; t < ztest_opts.zo_threads; t++)
VERIFY0(thread_join(run_threads[t]));
for (i = 0; i < ztest_opts.zo_threads; i++)
VERIFY0(thread_join(run_threads[i]));
/*
* Close all datasets. This must be done after all the threads
* are joined so we can be sure none of the datasets are in-use
* by any of the threads.
*/
for (t = 0; t < ztest_opts.zo_threads; t++) {
if (t < ztest_opts.zo_datasets)
ztest_dataset_close(t);
}
for (i = 0; i < ndatasets; i++)
ztest_dataset_close(i);
txg_wait_synced(spa_get_dsl(spa), 0);
@ -8464,6 +8470,7 @@ ztest_run(ztest_shared_t *zs)
int d = ztest_random(ztest_opts.zo_datasets);
ztest_dataset_destroy(d);
txg_wait_synced(spa_get_dsl(spa), 0);
}
zs->zs_enospc_count = 0;