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spa_misc: add an API for spa_namespace_lock

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This is useful as debugging support, as it lets namespace lock
operations be traced directly. It will also be useful for future work to
reduce the use of spa_namespace_lock, traditionally a source of
difficult deadlocks.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17906
This commit is contained in:
Rob Norris
2025-11-11 09:23:39 +11:00
committed by Brian Behlendorf
parent e305c7d596
commit ac0bc4cc00
21 changed files with 260 additions and 204 deletions
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module/zfs/vdev_initialize.c
+4 -4
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@@ -685,7 +685,7 @@ vdev_initialize_stop_wait(spa_t *spa, list_t *vd_list)
(void) spa;
vdev_t *vd;
ASSERT(MUTEX_HELD(&spa_namespace_lock) ||
ASSERT(spa_namespace_held() ||
spa->spa_export_thread == curthread);
while ((vd = list_remove_head(vd_list)) != NULL) {
@@ -728,7 +728,7 @@ vdev_initialize_stop(vdev_t *vd, vdev_initializing_state_t tgt_state,
if (vd_list == NULL) {
vdev_initialize_stop_wait_impl(vd);
} else {
ASSERT(MUTEX_HELD(&spa_namespace_lock) ||
ASSERT(spa_namespace_held() ||
vd->vdev_spa->spa_export_thread == curthread);
list_insert_tail(vd_list, vd);
}
@@ -761,7 +761,7 @@ vdev_initialize_stop_all(vdev_t *vd, vdev_initializing_state_t tgt_state)
spa_t *spa = vd->vdev_spa;
list_t vd_list;
ASSERT(MUTEX_HELD(&spa_namespace_lock) ||
ASSERT(spa_namespace_held() ||
spa->spa_export_thread == curthread);
list_create(&vd_list, sizeof (vdev_t),
@@ -781,7 +781,7 @@ vdev_initialize_stop_all(vdev_t *vd, vdev_initializing_state_t tgt_state)
void
vdev_initialize_restart(vdev_t *vd)
{
ASSERT(MUTEX_HELD(&spa_namespace_lock) ||
ASSERT(spa_namespace_held() ||
vd->vdev_spa->spa_load_thread == curthread);
ASSERT(!spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER));