[dm-devel] [PATCH 15/24] dm-raid456: add suspend/resume method

[NeilBrown]

These just call in to the md methods.

Signed-off-by: NeilBrown <neilb at suse.de>
---
 drivers/md/dm-raid456.c |   22 ++++++++++++++++++++++
 drivers/md/md.c         |    6 ++++--
 drivers/md/md.h         |    3 +++
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm-raid456.c b/drivers/md/dm-raid456.c
index 0b72fa4..044faae 100644
--- a/drivers/md/dm-raid456.c
+++ b/drivers/md/dm-raid456.c
@@ -466,6 +466,25 @@ static void raid_io_hints(struct dm_target *ti,
 			  (conf->raid_disks - conf->max_degraded));
 }
 
+static void raid_presuspend(struct dm_target *ti)
+{
+	struct raid_set *rs = ti->private;
+	md_stop_writes(&rs->md);
+}
+
+static void raid_postsuspend(struct dm_target *ti)
+{
+	struct raid_set *rs = ti->private;
+	mddev_suspend(&rs->md);
+}
+
+static void raid_resume(struct dm_target *ti)
+{
+	struct raid_set *rs = ti->private;
+
+	mddev_resume(&rs->md);
+}
+
 static struct target_type raid_target = {
 	.name = "raid45",
 	.version = {1, 0, 0},
@@ -476,6 +495,9 @@ static struct target_type raid_target = {
 	.status = raid_status,
 	.iterate_devices = raid_iterate_devices,
 	.io_hints = raid_io_hints,
+	.presuspend = raid_presuspend,
+	.postsuspend = raid_postsuspend,
+	.resume = raid_resume,
 };
 
 static int __init dm_raid_init(void)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index ea6577b..21f3c35 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)
 {
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 0bf8c18..6f2c568 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -512,4 +512,7 @@ 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 */