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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/zio_inject.c
+4 -4
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@@ -1008,9 +1008,9 @@ zio_inject_fault(char *name, int flags, int *id, zinject_record_t *record)
if (zio_pool_handler_exists(name, record->zi_cmd))
return (SET_ERROR(EEXIST));
mutex_enter(&spa_namespace_lock);
spa_namespace_enter(FTAG);
boolean_t has_spa = spa_lookup(name) != NULL;
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
if (record->zi_cmd == ZINJECT_DELAY_IMPORT && has_spa)
return (SET_ERROR(EEXIST));
@@ -1095,7 +1095,7 @@ zio_inject_list_next(int *id, char *name, size_t buflen,
inject_handler_t *handler;
int ret;
mutex_enter(&spa_namespace_lock);
spa_namespace_enter(FTAG);
rw_enter(&inject_lock, RW_READER);
for (handler = list_head(&inject_handlers); handler != NULL;
@@ -1117,7 +1117,7 @@ zio_inject_list_next(int *id, char *name, size_t buflen,
}
rw_exit(&inject_lock);
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
return (ret);
}