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>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3de623a..012482a 100644 (file)
--- 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 cc80305..6e7e349 100644 (file)
--- 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 */