block: move policy from disk to part0

Move disk->policy to part0->policy.  Implement and use get_disk_ro().

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 5 insertions, 11 deletions

diff --git a/block/genhd.c b/block/genhd.c
index c70db35076a0..70358f3c7423 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -757,7 +757,7 @@ static ssize_t disk_ro_show(struct device *dev,
 {
         struct gendisk *disk = dev_to_disk(dev);
 
-        return sprintf(buf, "%d\n", disk->policy ? 1 : 0);
+        return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0);
 }
 
 static ssize_t disk_capability_show(struct device *dev,
@@ -1090,10 +1090,7 @@ EXPORT_SYMBOL(put_disk);
 
 void set_device_ro(struct block_device *bdev, int flag)
 {
-        if (bdev->bd_contains != bdev)
-                bdev->bd_part->policy = flag;
-        else
-                bdev->bd_disk->policy = flag;
+        bdev->bd_part->policy = flag;
 }
 
 EXPORT_SYMBOL(set_device_ro);
@@ -1103,8 +1100,8 @@ void set_disk_ro(struct gendisk *disk, int flag)
         struct disk_part_iter piter;
         struct hd_struct *part;
 
-        disk->policy = flag;
-        disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
+        disk_part_iter_init(&piter, disk,
+                            DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0);
         while ((part = disk_part_iter_next(&piter)))
                 part->policy = flag;
         disk_part_iter_exit(&piter);
@@ -1116,10 +1113,7 @@ int bdev_read_only(struct block_device *bdev)
 {
         if (!bdev)
                 return 0;
-        else if (bdev->bd_contains != bdev)
-                return bdev->bd_part->policy;
-        else
-                return bdev->bd_disk->policy;
+        return bdev->bd_part->policy;
 }
 
 EXPORT_SYMBOL(bdev_read_only);