diff options
Diffstat (limited to 'module/zfs')
| -rw-r--r-- | module/zfs/mmp.c | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/module/zfs/mmp.c b/module/zfs/mmp.c index 539b76826..00478a39f 100644 --- a/module/zfs/mmp.c +++ b/module/zfs/mmp.c @@ -459,13 +459,61 @@ mmp_thread(spa_t *spa) mmp_thread_exit(mmp, &mmp->mmp_thread, &cpr); } +/* + * Signal the MMP thread to wake it, when it is sleeping on + * its cv. Used when some module parameter has changed and + * we want the thread to know about it. + * Only signal if the pool is active and mmp thread is + * running, otherwise there is no thread to wake. + */ +static void +mmp_signal_thread(spa_t *spa) +{ + mmp_thread_t *mmp = &spa->spa_mmp; + + mutex_enter(&mmp->mmp_thread_lock); + if (mmp->mmp_thread) + cv_broadcast(&mmp->mmp_thread_cv); + mutex_exit(&mmp->mmp_thread_lock); +} + +void +mmp_signal_all_threads(void) +{ + spa_t *spa = NULL; + + mutex_enter(&spa_namespace_lock); + while ((spa = spa_next(spa))) { + if (spa->spa_state == POOL_STATE_ACTIVE) + mmp_signal_thread(spa); + } + mutex_exit(&spa_namespace_lock); +} + #if defined(_KERNEL) && defined(HAVE_SPL) +#include <linux/mod_compat.h> + +static int +param_set_multihost_interval(const char *val, zfs_kernel_param_t *kp) +{ + int ret; + + ret = param_set_ulong(val, kp); + if (ret < 0) + return (ret); + + mmp_signal_all_threads(); + + return (ret); +} + /* BEGIN CSTYLED */ module_param(zfs_multihost_fail_intervals, uint, 0644); MODULE_PARM_DESC(zfs_multihost_fail_intervals, "Max allowed period without a successful mmp write"); -module_param(zfs_multihost_interval, ulong, 0644); +module_param_call(zfs_multihost_interval, param_set_multihost_interval, + param_get_ulong, &zfs_multihost_interval, 0644); MODULE_PARM_DESC(zfs_multihost_interval, "Milliseconds between mmp writes to each leaf"); |