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>

5 files changed, 13 insertions, 15 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);
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index f16bb4667238..03c2cb6a58bc 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1113,7 +1113,7 @@ static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
 
         if (write) {
                 /* disk has become write protected */
-                if (cd->disk->policy) {
+                if (get_disk_ro(cd->disk)) {
                         cdrom_end_request(drive, 0);
                         return ide_stopped;
                 }
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index c3de311117a1..5b919159f084 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -548,7 +548,7 @@ static int __dev_status(struct mapped_device *md, struct dm_ioctl *param)
          */
         param->open_count = dm_open_count(md);
 
-        if (disk->policy)
+        if (get_disk_ro(disk))
                 param->flags |= DM_READONLY_FLAG;
 
         param->event_nr = dm_get_event_nr(md);
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 24d2c56d7d2d..ace6d03602c7 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -375,7 +375,7 @@ int add_partition(struct gendisk *disk, int partno,
         p->start_sect = start;
         p->nr_sects = len;
         p->partno = partno;
-        p->policy = disk->policy;
+        p->policy = get_disk_ro(disk);
 
         dname = dev_name(ddev);
         if (isdigit(dname[strlen(dname) - 1]))
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 9cb8380cf0eb..4411bdd671dd 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -145,7 +145,6 @@ struct gendisk {
         struct kobject *slave_dir;
 
         struct timer_rand_state *random;
-        int policy;
 
         atomic_t sync_io;               /* RAID */
         unsigned long stamp;
@@ -403,6 +402,11 @@ extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
 extern void set_device_ro(struct block_device *bdev, int flag);
 extern void set_disk_ro(struct gendisk *disk, int flag);
 
+static inline int get_disk_ro(struct gendisk *disk)
+{
+        return disk->part0.policy;
+}
+
 /* drivers/char/random.c */
 extern void add_disk_randomness(struct gendisk *disk);
 extern void rand_initialize_disk(struct gendisk *disk);