md: export various start/stop interfaces

export entry points for starting and stopping md arrays.
This will be used by a module to make md/raid5 work under
dm.
Also stop calling md_stop_writes from md_stop, as that won't
work well with dm - it will want to call the two separately.

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

2 files changed, 20 insertions, 8 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3de623aceed0..012482a900fc 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -261,7 +261,7 @@ static int md_make_request(struct request_queue *q, struct bio *bio)
  * Once ->stop is called and completes, the module will be completely
  * unused.
  */
-static void mddev_suspend(mddev_t *mddev)
+void mddev_suspend(mddev_t *mddev)
 {
         BUG_ON(mddev->suspended);
         mddev->suspended = 1;
@@ -269,13 +269,15 @@ static void mddev_suspend(mddev_t *mddev)
         wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
         mddev->pers->quiesce(mddev, 1);
 }
+EXPORT_SYMBOL_GPL(mddev_suspend);
 
-static void mddev_resume(mddev_t *mddev)
+void mddev_resume(mddev_t *mddev)
 {
         mddev->suspended = 0;
         wake_up(&mddev->sb_wait);
         mddev->pers->quiesce(mddev, 0);
 }
+EXPORT_SYMBOL_GPL(mddev_resume);
 
 int mddev_congested(mddev_t *mddev, int bits)
 {
@@ -416,7 +418,7 @@ static void mddev_put(mddev_t *mddev)
         spin_unlock(&all_mddevs_lock);
 }
 
-static void mddev_init(mddev_t *mddev)
+void mddev_init(mddev_t *mddev)
 {
         mutex_init(&mddev->open_mutex);
         mutex_init(&mddev->reconfig_mutex);
@@ -436,6 +438,7 @@ static void mddev_init(mddev_t *mddev)
         mddev->resync_max = MaxSector;
         mddev->level = LEVEL_NONE;
 }
+EXPORT_SYMBOL_GPL(mddev_init);
 
 static mddev_t * mddev_find(dev_t unit)
 {
@@ -4333,7 +4336,7 @@ static void md_safemode_timeout(unsigned long data)
 
 static int start_dirty_degraded;
 
-static int md_run(mddev_t *mddev)
+int md_run(mddev_t *mddev)
 {
         int err;
         mdk_rdev_t *rdev;
@@ -4537,6 +4540,7 @@ static int md_run(mddev_t *mddev)
         sysfs_notify(&mddev->kobj, NULL, "degraded");
         return 0;
 }
+EXPORT_SYMBOL_GPL(md_run);
 
 static int do_md_run(mddev_t *mddev)
 {
@@ -4646,7 +4650,7 @@ static void md_clean(mddev_t *mddev)
         mddev->bitmap_info.max_write_behind = 0;
 }
 
-static void md_stop_writes(mddev_t *mddev)
+void md_stop_writes(mddev_t *mddev)
 {
         if (mddev->sync_thread) {
                 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
@@ -4666,11 +4670,10 @@ static void md_stop_writes(mddev_t *mddev)
                 md_update_sb(mddev, 1);
         }
 }
+EXPORT_SYMBOL_GPL(md_stop_writes);
 
-static void md_stop(mddev_t *mddev)
+void md_stop(mddev_t *mddev)
 {
-        md_stop_writes(mddev);
-
         mddev->pers->stop(mddev);
         if (mddev->pers->sync_request && mddev->to_remove == NULL)
                 mddev->to_remove = &md_redundancy_group;
@@ -4678,6 +4681,7 @@ static void md_stop(mddev_t *mddev)
         mddev->pers = NULL;
         clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
 }
+EXPORT_SYMBOL_GPL(md_stop);
 
 static int md_set_readonly(mddev_t *mddev, int is_open)
 {
@@ -4724,6 +4728,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
                 if (mddev->ro)
                         set_disk_ro(disk, 0);
 
+                md_stop_writes(mddev);
                 md_stop(mddev);
                 mddev->queue->merge_bvec_fn = NULL;
                 mddev->queue->unplug_fn = NULL;
diff --git a/drivers/md/md.h b/drivers/md/md.h
index cc8030543e82..6e7e3495f6e4 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -487,5 +487,12 @@ extern void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
 extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
 extern void restore_bitmap_write_access(struct file *file);
 
+extern void mddev_init(mddev_t *mddev);
+extern int md_run(mddev_t *mddev);
+extern void md_stop(mddev_t *mddev);
+extern void md_stop_writes(mddev_t *mddev);
 extern void md_rdev_init(mdk_rdev_t *rdev);
+
+extern void mddev_suspend(mddev_t *mddev);
+extern void mddev_resume(mddev_t *mddev);
 #endif /* _MD_MD_H */