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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/zvol.c
+3 -3
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@@ -1233,7 +1233,7 @@ zvol_first_open(zvol_state_t *zv, boolean_t readonly)
ASSERT(RW_READ_HELD(&zv->zv_suspend_lock));
ASSERT(MUTEX_HELD(&zv->zv_state_lock));
ASSERT(mutex_owned(&spa_namespace_lock));
ASSERT(spa_namespace_held());
boolean_t ro = (readonly || (strchr(zv->zv_name, '@') != NULL));
error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, ro, B_TRUE, zv, &os);
@@ -1303,7 +1303,7 @@ zvol_create_snap_minor_cb(const char *dsname, void *arg)
list_t *minors_list = j->list;
const char *name = j->name;
ASSERT0(MUTEX_HELD(&spa_namespace_lock));
ASSERT0(spa_namespace_held());
/* skip the designated dataset */
if (name && strcmp(dsname, name) == 0)
@@ -1403,7 +1403,7 @@ zvol_create_minors_cb(const char *dsname, void *arg)
int error;
list_t *minors_list = arg;
ASSERT0(MUTEX_HELD(&spa_namespace_lock));
ASSERT0(spa_namespace_held());
error = dsl_prop_get_integer(dsname, "snapdev", &snapdev, NULL);
if (error)