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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/zfs_fm.c
+3 -3
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@@ -1580,10 +1580,10 @@ zfs_ereport_zvol_post(const char *subclass, const char *name,
nvlist_t *aux;
char *r;
boolean_t locked = mutex_owned(&spa_namespace_lock);
if (!locked) mutex_enter(&spa_namespace_lock);
boolean_t locked = spa_namespace_held();
if (!locked) spa_namespace_enter(FTAG);
spa_t *spa = spa_lookup(name);
if (!locked) mutex_exit(&spa_namespace_lock);
if (!locked) spa_namespace_exit(FTAG);
if (spa == NULL)
return;