md: use sysfs_notify_dirent to notify changes to md/sync_action.

There is no compelling need for this, but sysfs_notify_dirent is a
nicer interface and the change is good for consistency.

Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 1b1d326..ee759b1 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3046,7 +3046,7 @@ action_store(mddev_t *mddev, const char *page, size_t len)
        }
        set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
        md_wakeup_thread(mddev->thread);
-       sysfs_notify(&mddev->kobj, NULL, "sync_action");
+       sysfs_notify_dirent(mddev->sysfs_action);
        return len;
 }
 
@@ -3684,6 +3684,7 @@ static int do_md_run(mddev_t * mddev)
                        printk(KERN_WARNING
                               "md: cannot register extra attributes for %s\n",
                               mdname(mddev));
+               mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
        } else if (mddev->ro == 2) /* auto-readonly not meaningful */
                mddev->ro = 0;
 
@@ -3754,7 +3755,8 @@ static int do_md_run(mddev_t * mddev)
        mddev->changed = 1;
        md_new_event(mddev);
        sysfs_notify_dirent(mddev->sysfs_state);
-       sysfs_notify(&mddev->kobj, NULL, "sync_action");
+       if (mddev->sysfs_action)
+               sysfs_notify_dirent(mddev->sysfs_action);
        sysfs_notify(&mddev->kobj, NULL, "degraded");
        kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
        return 0;
@@ -3854,9 +3856,12 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
                        mddev->queue->merge_bvec_fn = NULL;
                        mddev->queue->unplug_fn = NULL;
                        mddev->queue->backing_dev_info.congested_fn = NULL;
-                       if (mddev->pers->sync_request)
+                       if (mddev->pers->sync_request) {
                                sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
-
+                               if (mddev->sysfs_action)
+                                       sysfs_put(mddev->sysfs_action);
+                               mddev->sysfs_action = NULL;
+                       }
                        module_put(mddev->pers->owner);
                        mddev->pers = NULL;
                        /* tell userspace to handle 'inactive' */
@@ -6155,7 +6160,7 @@ void md_check_recovery(mddev_t *mddev)
                        mddev->recovery = 0;
                        /* flag recovery needed just to double check */
                        set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-                       sysfs_notify(&mddev->kobj, NULL, "sync_action");
+                       sysfs_notify_dirent(mddev->sysfs_action);
                        md_new_event(mddev);
                        goto unlock;
                }
@@ -6216,7 +6221,7 @@ void md_check_recovery(mddev_t *mddev)
                                mddev->recovery = 0;
                        } else
                                md_wakeup_thread(mddev->sync_thread);
-                       sysfs_notify(&mddev->kobj, NULL, "sync_action");
+                       sysfs_notify_dirent(mddev->sysfs_action);
                        md_new_event(mddev);
                }
        unlock:
@@ -6224,7 +6229,8 @@ void md_check_recovery(mddev_t *mddev)
                        clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
                        if (test_and_clear_bit(MD_RECOVERY_RECOVER,
                                               &mddev->recovery))
-                               sysfs_notify(&mddev->kobj, NULL, "sync_action");
+                               if (mddev->sysfs_action)
+                                       sysfs_notify_dirent(mddev->sysfs_action);
                }
                mddev_unlock(mddev);
        }

diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 8fc909e..663803e 100644 (file)
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -244,6 +244,7 @@ struct mddev_s
        struct sysfs_dirent             *sysfs_state;   /* handle for 'array_state'
                                                         * file in sysfs.
                                                         */
+       struct sysfs_dirent             *sysfs_action;  /* handle for 'sync_action' */
 
        spinlock_t                      write_lock;
        wait_queue_head_t               sb_wait;        /* for waiting on superblock updates */