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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
Download Patch File Download Diff File Expand all files Collapse all files
module/os/freebsd/zfs/spa_os.c
+5 -5
View File
@@ -193,7 +193,7 @@ spa_import_rootpool(const char *name, bool checkpointrewind)
*/
config = spa_generate_rootconf(name);
mutex_enter(&spa_namespace_lock);
spa_namespace_enter(FTAG);
if (config != NULL) {
pname = fnvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME);
VERIFY0(strcmp(name, pname));
@@ -204,7 +204,7 @@ spa_import_rootpool(const char *name, bool checkpointrewind)
* e.g., after reboot -r.
*/
if (spa->spa_state == POOL_STATE_ACTIVE) {
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
fnvlist_free(config);
return (0);
}
@@ -226,7 +226,7 @@ spa_import_rootpool(const char *name, bool checkpointrewind)
&spa->spa_ubsync.ub_version) != 0)
spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL;
} else if ((spa = spa_lookup(name)) == NULL) {
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
fnvlist_free(config);
cmn_err(CE_NOTE, "Cannot find the pool label for '%s'",
name);
@@ -249,7 +249,7 @@ spa_import_rootpool(const char *name, bool checkpointrewind)
VDEV_ALLOC_ROOTPOOL);
spa_config_exit(spa, SCL_ALL, FTAG);
if (error) {
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
fnvlist_free(config);
cmn_err(CE_NOTE, "Can not parse the config for pool '%s'",
name);
@@ -259,7 +259,7 @@ spa_import_rootpool(const char *name, bool checkpointrewind)
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
vdev_free(rvd);
spa_config_exit(spa, SCL_ALL, FTAG);
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
fnvlist_free(config);
return (0);
module/os/freebsd/zfs/zfs_ioctl_os.c
+2 -2
View File
@@ -108,11 +108,11 @@ zfs_ioc_nextboot(const char *unused, nvlist_t *innvl, nvlist_t *outnvl)
"command", &command) != 0)
return (EINVAL);
mutex_enter(&spa_namespace_lock);
spa_namespace_enter(FTAG);
spa = spa_by_guid(pool_guid, vdev_guid);
if (spa != NULL)
strcpy(name, spa_name(spa));
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
if (spa == NULL)
return (ENOENT);
module/os/freebsd/zfs/zvol_os.c
+6 -6
View File
@@ -282,8 +282,8 @@ retry:
* Take spa_namespace_lock to prevent lock inversion when
* zvols from one pool are opened as vdevs in another.
*/
if (!mutex_owned(&spa_namespace_lock)) {
if (!mutex_tryenter(&spa_namespace_lock)) {
if (!spa_namespace_held()) {
if (!spa_namespace_tryenter(FTAG)) {
mutex_exit(&zv->zv_state_lock);
rw_exit(&zv->zv_suspend_lock);
drop_suspend = B_FALSE;
@@ -295,7 +295,7 @@ retry:
}
err = zvol_first_open(zv, !(flag & FWRITE));
if (drop_namespace)
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
if (err)
goto out_locked;
pp->mediasize = zv->zv_volsize;
@@ -962,8 +962,8 @@ retry:
* Take spa_namespace_lock to prevent lock inversion when
* zvols from one pool are opened as vdevs in another.
*/
if (!mutex_owned(&spa_namespace_lock)) {
if (!mutex_tryenter(&spa_namespace_lock)) {
if (!spa_namespace_held()) {
if (!spa_namespace_tryenter(FTAG)) {
mutex_exit(&zv->zv_state_lock);
rw_exit(&zv->zv_suspend_lock);
drop_suspend = B_FALSE;
@@ -975,7 +975,7 @@ retry:
}
err = zvol_first_open(zv, !(flags & FWRITE));
if (drop_namespace)
mutex_exit(&spa_namespace_lock);
spa_namespace_exit(FTAG);
if (err)
goto out_locked;
}