diff options
Diffstat (limited to 'fs/ocfs2/cluster/heartbeat.c')
| -rw-r--r-- | fs/ocfs2/cluster/heartbeat.c | 96 |
1 files changed, 93 insertions, 3 deletions
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c index 979113479c6..2bd7f788cf3 100644 --- a/fs/ocfs2/cluster/heartbeat.c +++ b/fs/ocfs2/cluster/heartbeat.c @@ -1335,6 +1335,7 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, ret = wait_event_interruptible(o2hb_steady_queue, atomic_read(®->hr_steady_iterations) == 0); if (ret) { + /* We got interrupted (hello ptrace!). Clean up */ spin_lock(&o2hb_live_lock); hb_task = reg->hr_task; reg->hr_task = NULL; @@ -1345,7 +1346,16 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, goto out; } - ret = count; + /* Ok, we were woken. Make sure it wasn't by drop_item() */ + spin_lock(&o2hb_live_lock); + hb_task = reg->hr_task; + spin_unlock(&o2hb_live_lock); + + if (hb_task) + ret = count; + else + ret = -EIO; + out: if (filp) fput(filp); @@ -1523,6 +1533,15 @@ static void o2hb_heartbeat_group_drop_item(struct config_group *group, if (hb_task) kthread_stop(hb_task); + /* + * If we're racing a dev_write(), we need to wake them. They will + * check reg->hr_task + */ + if (atomic_read(®->hr_steady_iterations) != 0) { + atomic_set(®->hr_steady_iterations, 0); + wake_up(&o2hb_steady_queue); + } + config_item_put(item); } @@ -1665,7 +1684,67 @@ void o2hb_setup_callback(struct o2hb_callback_func *hc, } EXPORT_SYMBOL_GPL(o2hb_setup_callback); -int o2hb_register_callback(struct o2hb_callback_func *hc) +static struct o2hb_region *o2hb_find_region(const char *region_uuid) +{ + struct o2hb_region *p, *reg = NULL; + + assert_spin_locked(&o2hb_live_lock); + + list_for_each_entry(p, &o2hb_all_regions, hr_all_item) { + if (!strcmp(region_uuid, config_item_name(&p->hr_item))) { + reg = p; + break; + } + } + + return reg; +} + +static int o2hb_region_get(const char *region_uuid) +{ + int ret = 0; + struct o2hb_region *reg; + + spin_lock(&o2hb_live_lock); + + reg = o2hb_find_region(region_uuid); + if (!reg) + ret = -ENOENT; + spin_unlock(&o2hb_live_lock); + + if (ret) + goto out; + + ret = o2nm_depend_this_node(); + if (ret) + goto out; + + ret = o2nm_depend_item(®->hr_item); + if (ret) + o2nm_undepend_this_node(); + +out: + return ret; +} + +static void o2hb_region_put(const char *region_uuid) +{ + struct o2hb_region *reg; + + spin_lock(&o2hb_live_lock); + + reg = o2hb_find_region(region_uuid); + + spin_unlock(&o2hb_live_lock); + + if (reg) { + o2nm_undepend_item(®->hr_item); + o2nm_undepend_this_node(); + } +} + +int o2hb_register_callback(const char *region_uuid, + struct o2hb_callback_func *hc) { struct o2hb_callback_func *tmp; struct list_head *iter; @@ -1681,6 +1760,12 @@ int o2hb_register_callback(struct o2hb_callback_func *hc) goto out; } + if (region_uuid) { + ret = o2hb_region_get(region_uuid); + if (ret) + goto out; + } + down_write(&o2hb_callback_sem); list_for_each(iter, &hbcall->list) { @@ -1702,16 +1787,21 @@ out: } EXPORT_SYMBOL_GPL(o2hb_register_callback); -void o2hb_unregister_callback(struct o2hb_callback_func *hc) +void o2hb_unregister_callback(const char *region_uuid, + struct o2hb_callback_func *hc) { BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); mlog(ML_HEARTBEAT, "on behalf of %p for funcs %p\n", __builtin_return_address(0), hc); + /* XXX Can this happen _with_ a region reference? */ if (list_empty(&hc->hc_item)) return; + if (region_uuid) + o2hb_region_put(region_uuid); + down_write(&o2hb_callback_sem); list_del_init(&hc->hc_item); |