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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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cmd/zdb/zdb.c
+4 -4
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@@ -7899,11 +7899,11 @@ zdb_set_skip_mmp(char *target)
* Disable the activity check to allow examination of
* active pools.
*/
mutex_enter(&spa_namespace_lock);
spa_namespace_enter(FTAG);
if ((spa = spa_lookup(target)) != NULL) {
spa->spa_import_flags |= ZFS_IMPORT_SKIP_MMP;
}
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
}
#define BOGUS_SUFFIX "_CHECKPOINTED_UNIVERSE"
@@ -10022,13 +10022,13 @@ main(int argc, char **argv)
* try opening the pool after clearing the
* log state.
*/
mutex_enter(&spa_namespace_lock);
spa_namespace_enter(FTAG);
if ((spa = spa_lookup(target)) != NULL &&
spa->spa_log_state == SPA_LOG_MISSING) {
spa->spa_log_state = SPA_LOG_CLEAR;
error = 0;
}
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
if (!error) {
error = spa_open_rewind(target, &spa,