md: dm-raid should call helper function to clear rdev.

dm-raid currently open-codes the freeing of some members of
and rdev.  It is more maintainable to have it call common code
from md.c which does this for all call-sites.

So remove free_disk_sb to md_rdev_clear, export it, and use it in
dm-raid.c

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

3 files changed, 6 insertions, 8 deletions

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 68965e663248..73a068da10d9 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -155,10 +155,7 @@ static void context_free(struct raid_set *rs)
         for (i = 0; i < rs->md.raid_disks; i++) {
                 if (rs->dev[i].meta_dev)
                         dm_put_device(rs->ti, rs->dev[i].meta_dev);
-                if (rs->dev[i].rdev.sb_page)
-                        put_page(rs->dev[i].rdev.sb_page);
-                rs->dev[i].rdev.sb_page = NULL;
-                rs->dev[i].rdev.sb_loaded = 0;
+                md_rdev_clear(&rs->dev[i].rdev);
                 if (rs->dev[i].data_dev)
                         dm_put_device(rs->ti, rs->dev[i].data_dev);
         }
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 8fe1abf1b89c..d557e557ff8f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -803,7 +803,7 @@ static int alloc_disk_sb(struct md_rdev * rdev)
         return 0;
 }
 
-static void free_disk_sb(struct md_rdev * rdev)
+void md_rdev_clear(struct md_rdev *rdev)
 {
         if (rdev->sb_page) {
                 put_page(rdev->sb_page);
@@ -817,7 +817,7 @@ static void free_disk_sb(struct md_rdev * rdev)
                 rdev->bb_page = NULL;
         }
 }
-
+EXPORT_SYMBOL_GPL(md_rdev_clear);
 
 static void super_written(struct bio *bio, int error)
 {
@@ -2244,7 +2244,7 @@ static void export_rdev(struct md_rdev * rdev)
                 bdevname(rdev->bdev,b));
         if (rdev->mddev)
                 MD_BUG();
-        free_disk_sb(rdev);
+        md_rdev_clear(rdev);
 #ifndef MODULE
         if (test_bit(AutoDetected, &rdev->flags))
                 md_autodetect_dev(rdev->bdev->bd_dev);
@@ -3324,7 +3324,7 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
 abort_free:
         if (rdev->bdev)
                 unlock_rdev(rdev);
-        free_disk_sb(rdev);
+        md_rdev_clear(rdev);
         kfree(rdev->badblocks.page);
         kfree(rdev);
         return ERR_PTR(err);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 98913e8dac1a..360937389e64 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -619,6 +619,7 @@ extern int md_run(struct mddev *mddev);
 extern void md_stop(struct mddev *mddev);
 extern void md_stop_writes(struct mddev *mddev);
 extern int md_rdev_init(struct md_rdev *rdev);
+extern void md_rdev_clear(struct md_rdev *rdev);
 
 extern void mddev_suspend(struct mddev *mddev);
 extern void mddev_resume(struct mddev *mddev);